[www-releases] r262945 - Commit the 3.8.0 release
Hans Wennborg via llvm-commits
llvm-commits at lists.llvm.org
Tue Mar 8 10:28:25 PST 2016
Added: www-releases/trunk/3.8.0/projects/libcxx/docs/_static/jquery.js
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/jquery.js?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/projects/libcxx/docs/_static/jquery.js (added)
+++ www-releases/trunk/3.8.0/projects/libcxx/docs/_static/jquery.js Tue Mar 8 12:28:17 2016
@@ -0,0 +1,9404 @@
+/*!
+ * jQuery JavaScript Library v1.7.2
+ * http://jquery.com/
+ *
+ * Copyright 2011, John Resig
+ * Dual licensed under the MIT or GPL Version 2 licenses.
+ * http://jquery.org/license
+ *
+ * Includes Sizzle.js
+ * http://sizzlejs.com/
+ * Copyright 2011, The Dojo Foundation
+ * Released under the MIT, BSD, and GPL Licenses.
+ *
+ * Date: Fri Jul 5 14:07:58 UTC 2013
+ */
+(function( window, undefined ) {
+
+// Use the correct document accordingly with window argument (sandbox)
+var document = window.document,
+ navigator = window.navigator,
+ location = window.location;
+var jQuery = (function() {
+
+// Define a local copy of jQuery
+var jQuery = function( selector, context ) {
+ // The jQuery object is actually just the init constructor 'enhanced'
+ return new jQuery.fn.init( selector, context, rootjQuery );
+ },
+
+ // Map over jQuery in case of overwrite
+ _jQuery = window.jQuery,
+
+ // Map over the $ in case of overwrite
+ _$ = window.$,
+
+ // A central reference to the root jQuery(document)
+ rootjQuery,
+
+ // A simple way to check for HTML strings or ID strings
+ // Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
+ quickExpr = /^(?:[^#<]*(<[\w\W]+>)[^>]*$|#([\w\-]*)$)/,
+
+ // Check if a string has a non-whitespace character in it
+ rnotwhite = /\S/,
+
+ // Used for trimming whitespace
+ trimLeft = /^\s+/,
+ trimRight = /\s+$/,
+
+ // Match a standalone tag
+ rsingleTag = /^<(\w+)\s*\/?>(?:<\/\1>)?$/,
+
+ // JSON RegExp
+ rvalidchars = /^[\],:{}\s]*$/,
+ rvalidescape = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,
+ rvalidtokens = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,
+ rvalidbraces = /(?:^|:|,)(?:\s*\[)+/g,
+
+ // Useragent RegExp
+ rwebkit = /(webkit)[ \/]([\w.]+)/,
+ ropera = /(opera)(?:.*version)?[ \/]([\w.]+)/,
+ rmsie = /(msie) ([\w.]+)/,
+ rmozilla = /(mozilla)(?:.*? rv:([\w.]+))?/,
+
+ // Matches dashed string for camelizing
+ rdashAlpha = /-([a-z]|[0-9])/ig,
+ rmsPrefix = /^-ms-/,
+
+ // Used by jQuery.camelCase as callback to replace()
+ fcamelCase = function( all, letter ) {
+ return ( letter + "" ).toUpperCase();
+ },
+
+ // Keep a UserAgent string for use with jQuery.browser
+ userAgent = navigator.userAgent,
+
+ // For matching the engine and version of the browser
+ browserMatch,
+
+ // The deferred used on DOM ready
+ readyList,
+
+ // The ready event handler
+ DOMContentLoaded,
+
+ // Save a reference to some core methods
+ toString = Object.prototype.toString,
+ hasOwn = Object.prototype.hasOwnProperty,
+ push = Array.prototype.push,
+ slice = Array.prototype.slice,
+ trim = String.prototype.trim,
+ indexOf = Array.prototype.indexOf,
+
+ // [[Class]] -> type pairs
+ class2type = {};
+
+jQuery.fn = jQuery.prototype = {
+ constructor: jQuery,
+ init: function( selector, context, rootjQuery ) {
+ var match, elem, ret, doc;
+
+ // Handle $(""), $(null), or $(undefined)
+ if ( !selector ) {
+ return this;
+ }
+
+ // Handle $(DOMElement)
+ if ( selector.nodeType ) {
+ this.context = this[0] = selector;
+ this.length = 1;
+ return this;
+ }
+
+ // The body element only exists once, optimize finding it
+ if ( selector === "body" && !context && document.body ) {
+ this.context = document;
+ this[0] = document.body;
+ this.selector = selector;
+ this.length = 1;
+ return this;
+ }
+
+ // Handle HTML strings
+ if ( typeof selector === "string" ) {
+ // Are we dealing with HTML string or an ID?
+ if ( selector.charAt(0) === "<" && selector.charAt( selector.length - 1 ) === ">" && selector.length >= 3 ) {
+ // Assume that strings that start and end with <> are HTML and skip the regex check
+ match = [ null, selector, null ];
+
+ } else {
+ match = quickExpr.exec( selector );
+ }
+
+ // Verify a match, and that no context was specified for #id
+ if ( match && (match[1] || !context) ) {
+
+ // HANDLE: $(html) -> $(array)
+ if ( match[1] ) {
+ context = context instanceof jQuery ? context[0] : context;
+ doc = ( context ? context.ownerDocument || context : document );
+
+ // If a single string is passed in and it's a single tag
+ // just do a createElement and skip the rest
+ ret = rsingleTag.exec( selector );
+
+ if ( ret ) {
+ if ( jQuery.isPlainObject( context ) ) {
+ selector = [ document.createElement( ret[1] ) ];
+ jQuery.fn.attr.call( selector, context, true );
+
+ } else {
+ selector = [ doc.createElement( ret[1] ) ];
+ }
+
+ } else {
+ ret = jQuery.buildFragment( [ match[1] ], [ doc ] );
+ selector = ( ret.cacheable ? jQuery.clone(ret.fragment) : ret.fragment ).childNodes;
+ }
+
+ return jQuery.merge( this, selector );
+
+ // HANDLE: $("#id")
+ } else {
+ elem = document.getElementById( match[2] );
+
+ // Check parentNode to catch when Blackberry 4.6 returns
+ // nodes that are no longer in the document #6963
+ if ( elem && elem.parentNode ) {
+ // Handle the case where IE and Opera return items
+ // by name instead of ID
+ if ( elem.id !== match[2] ) {
+ return rootjQuery.find( selector );
+ }
+
+ // Otherwise, we inject the element directly into the jQuery object
+ this.length = 1;
+ this[0] = elem;
+ }
+
+ this.context = document;
+ this.selector = selector;
+ return this;
+ }
+
+ // HANDLE: $(expr, $(...))
+ } else if ( !context || context.jquery ) {
+ return ( context || rootjQuery ).find( selector );
+
+ // HANDLE: $(expr, context)
+ // (which is just equivalent to: $(context).find(expr)
+ } else {
+ return this.constructor( context ).find( selector );
+ }
+
+ // HANDLE: $(function)
+ // Shortcut for document ready
+ } else if ( jQuery.isFunction( selector ) ) {
+ return rootjQuery.ready( selector );
+ }
+
+ if ( selector.selector !== undefined ) {
+ this.selector = selector.selector;
+ this.context = selector.context;
+ }
+
+ return jQuery.makeArray( selector, this );
+ },
+
+ // Start with an empty selector
+ selector: "",
+
+ // The current version of jQuery being used
+ jquery: "1.7.2",
+
+ // The default length of a jQuery object is 0
+ length: 0,
+
+ // The number of elements contained in the matched element set
+ size: function() {
+ return this.length;
+ },
+
+ toArray: function() {
+ return slice.call( this, 0 );
+ },
+
+ // Get the Nth element in the matched element set OR
+ // Get the whole matched element set as a clean array
+ get: function( num ) {
+ return num == null ?
+
+ // Return a 'clean' array
+ this.toArray() :
+
+ // Return just the object
+ ( num < 0 ? this[ this.length + num ] : this[ num ] );
+ },
+
+ // Take an array of elements and push it onto the stack
+ // (returning the new matched element set)
+ pushStack: function( elems, name, selector ) {
+ // Build a new jQuery matched element set
+ var ret = this.constructor();
+
+ if ( jQuery.isArray( elems ) ) {
+ push.apply( ret, elems );
+
+ } else {
+ jQuery.merge( ret, elems );
+ }
+
+ // Add the old object onto the stack (as a reference)
+ ret.prevObject = this;
+
+ ret.context = this.context;
+
+ if ( name === "find" ) {
+ ret.selector = this.selector + ( this.selector ? " " : "" ) + selector;
+ } else if ( name ) {
+ ret.selector = this.selector + "." + name + "(" + selector + ")";
+ }
+
+ // Return the newly-formed element set
+ return ret;
+ },
+
+ // Execute a callback for every element in the matched set.
+ // (You can seed the arguments with an array of args, but this is
+ // only used internally.)
+ each: function( callback, args ) {
+ return jQuery.each( this, callback, args );
+ },
+
+ ready: function( fn ) {
+ // Attach the listeners
+ jQuery.bindReady();
+
+ // Add the callback
+ readyList.add( fn );
+
+ return this;
+ },
+
+ eq: function( i ) {
+ i = +i;
+ return i === -1 ?
+ this.slice( i ) :
+ this.slice( i, i + 1 );
+ },
+
+ first: function() {
+ return this.eq( 0 );
+ },
+
+ last: function() {
+ return this.eq( -1 );
+ },
+
+ slice: function() {
+ return this.pushStack( slice.apply( this, arguments ),
+ "slice", slice.call(arguments).join(",") );
+ },
+
+ map: function( callback ) {
+ return this.pushStack( jQuery.map(this, function( elem, i ) {
+ return callback.call( elem, i, elem );
+ }));
+ },
+
+ end: function() {
+ return this.prevObject || this.constructor(null);
+ },
+
+ // For internal use only.
+ // Behaves like an Array's method, not like a jQuery method.
+ push: push,
+ sort: [].sort,
+ splice: [].splice
+};
+
+// Give the init function the jQuery prototype for later instantiation
+jQuery.fn.init.prototype = jQuery.fn;
+
+jQuery.extend = jQuery.fn.extend = function() {
+ var options, name, src, copy, copyIsArray, clone,
+ target = arguments[0] || {},
+ i = 1,
+ length = arguments.length,
+ deep = false;
+
+ // Handle a deep copy situation
+ if ( typeof target === "boolean" ) {
+ deep = target;
+ target = arguments[1] || {};
+ // skip the boolean and the target
+ i = 2;
+ }
+
+ // Handle case when target is a string or something (possible in deep copy)
+ if ( typeof target !== "object" && !jQuery.isFunction(target) ) {
+ target = {};
+ }
+
+ // extend jQuery itself if only one argument is passed
+ if ( length === i ) {
+ target = this;
+ --i;
+ }
+
+ for ( ; i < length; i++ ) {
+ // Only deal with non-null/undefined values
+ if ( (options = arguments[ i ]) != null ) {
+ // Extend the base object
+ for ( name in options ) {
+ src = target[ name ];
+ copy = options[ name ];
+
+ // Prevent never-ending loop
+ if ( target === copy ) {
+ continue;
+ }
+
+ // Recurse if we're merging plain objects or arrays
+ if ( deep && copy && ( jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)) ) ) {
+ if ( copyIsArray ) {
+ copyIsArray = false;
+ clone = src && jQuery.isArray(src) ? src : [];
+
+ } else {
+ clone = src && jQuery.isPlainObject(src) ? src : {};
+ }
+
+ // Never move original objects, clone them
+ target[ name ] = jQuery.extend( deep, clone, copy );
+
+ // Don't bring in undefined values
+ } else if ( copy !== undefined ) {
+ target[ name ] = copy;
+ }
+ }
+ }
+ }
+
+ // Return the modified object
+ return target;
+};
+
+jQuery.extend({
+ noConflict: function( deep ) {
+ if ( window.$ === jQuery ) {
+ window.$ = _$;
+ }
+
+ if ( deep && window.jQuery === jQuery ) {
+ window.jQuery = _jQuery;
+ }
+
+ return jQuery;
+ },
+
+ // Is the DOM ready to be used? Set to true once it occurs.
+ isReady: false,
+
+ // A counter to track how many items to wait for before
+ // the ready event fires. See #6781
+ readyWait: 1,
+
+ // Hold (or release) the ready event
+ holdReady: function( hold ) {
+ if ( hold ) {
+ jQuery.readyWait++;
+ } else {
+ jQuery.ready( true );
+ }
+ },
+
+ // Handle when the DOM is ready
+ ready: function( wait ) {
+ // Either a released hold or an DOMready/load event and not yet ready
+ if ( (wait === true && !--jQuery.readyWait) || (wait !== true && !jQuery.isReady) ) {
+ // Make sure body exists, at least, in case IE gets a little overzealous (ticket #5443).
+ if ( !document.body ) {
+ return setTimeout( jQuery.ready, 1 );
+ }
+
+ // Remember that the DOM is ready
+ jQuery.isReady = true;
+
+ // If a normal DOM Ready event fired, decrement, and wait if need be
+ if ( wait !== true && --jQuery.readyWait > 0 ) {
+ return;
+ }
+
+ // If there are functions bound, to execute
+ readyList.fireWith( document, [ jQuery ] );
+
+ // Trigger any bound ready events
+ if ( jQuery.fn.trigger ) {
+ jQuery( document ).trigger( "ready" ).off( "ready" );
+ }
+ }
+ },
+
+ bindReady: function() {
+ if ( readyList ) {
+ return;
+ }
+
+ readyList = jQuery.Callbacks( "once memory" );
+
+ // Catch cases where $(document).ready() is called after the
+ // browser event has already occurred.
+ if ( document.readyState === "complete" ) {
+ // Handle it asynchronously to allow scripts the opportunity to delay ready
+ return setTimeout( jQuery.ready, 1 );
+ }
+
+ // Mozilla, Opera and webkit nightlies currently support this event
+ if ( document.addEventListener ) {
+ // Use the handy event callback
+ document.addEventListener( "DOMContentLoaded", DOMContentLoaded, false );
+
+ // A fallback to window.onload, that will always work
+ window.addEventListener( "load", jQuery.ready, false );
+
+ // If IE event model is used
+ } else if ( document.attachEvent ) {
+ // ensure firing before onload,
+ // maybe late but safe also for iframes
+ document.attachEvent( "onreadystatechange", DOMContentLoaded );
+
+ // A fallback to window.onload, that will always work
+ window.attachEvent( "onload", jQuery.ready );
+
+ // If IE and not a frame
+ // continually check to see if the document is ready
+ var toplevel = false;
+
+ try {
+ toplevel = window.frameElement == null;
+ } catch(e) {}
+
+ if ( document.documentElement.doScroll && toplevel ) {
+ doScrollCheck();
+ }
+ }
+ },
+
+ // See test/unit/core.js for details concerning isFunction.
+ // Since version 1.3, DOM methods and functions like alert
+ // aren't supported. They return false on IE (#2968).
+ isFunction: function( obj ) {
+ return jQuery.type(obj) === "function";
+ },
+
+ isArray: Array.isArray || function( obj ) {
+ return jQuery.type(obj) === "array";
+ },
+
+ isWindow: function( obj ) {
+ return obj != null && obj == obj.window;
+ },
+
+ isNumeric: function( obj ) {
+ return !isNaN( parseFloat(obj) ) && isFinite( obj );
+ },
+
+ type: function( obj ) {
+ return obj == null ?
+ String( obj ) :
+ class2type[ toString.call(obj) ] || "object";
+ },
+
+ isPlainObject: function( obj ) {
+ // Must be an Object.
+ // Because of IE, we also have to check the presence of the constructor property.
+ // Make sure that DOM nodes and window objects don't pass through, as well
+ if ( !obj || jQuery.type(obj) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
+ return false;
+ }
+
+ try {
+ // Not own constructor property must be Object
+ if ( obj.constructor &&
+ !hasOwn.call(obj, "constructor") &&
+ !hasOwn.call(obj.constructor.prototype, "isPrototypeOf") ) {
+ return false;
+ }
+ } catch ( e ) {
+ // IE8,9 Will throw exceptions on certain host objects #9897
+ return false;
+ }
+
+ // Own properties are enumerated firstly, so to speed up,
+ // if last one is own, then all properties are own.
+
+ var key;
+ for ( key in obj ) {}
+
+ return key === undefined || hasOwn.call( obj, key );
+ },
+
+ isEmptyObject: function( obj ) {
+ for ( var name in obj ) {
+ return false;
+ }
+ return true;
+ },
+
+ error: function( msg ) {
+ throw new Error( msg );
+ },
+
+ parseJSON: function( data ) {
+ if ( typeof data !== "string" || !data ) {
+ return null;
+ }
+
+ // Make sure leading/trailing whitespace is removed (IE can't handle it)
+ data = jQuery.trim( data );
+
+ // Attempt to parse using the native JSON parser first
+ if ( window.JSON && window.JSON.parse ) {
+ return window.JSON.parse( data );
+ }
+
+ // Make sure the incoming data is actual JSON
+ // Logic borrowed from http://json.org/json2.js
+ if ( rvalidchars.test( data.replace( rvalidescape, "@" )
+ .replace( rvalidtokens, "]" )
+ .replace( rvalidbraces, "")) ) {
+
+ return ( new Function( "return " + data ) )();
+
+ }
+ jQuery.error( "Invalid JSON: " + data );
+ },
+
+ // Cross-browser xml parsing
+ parseXML: function( data ) {
+ if ( typeof data !== "string" || !data ) {
+ return null;
+ }
+ var xml, tmp;
+ try {
+ if ( window.DOMParser ) { // Standard
+ tmp = new DOMParser();
+ xml = tmp.parseFromString( data , "text/xml" );
+ } else { // IE
+ xml = new ActiveXObject( "Microsoft.XMLDOM" );
+ xml.async = "false";
+ xml.loadXML( data );
+ }
+ } catch( e ) {
+ xml = undefined;
+ }
+ if ( !xml || !xml.documentElement || xml.getElementsByTagName( "parsererror" ).length ) {
+ jQuery.error( "Invalid XML: " + data );
+ }
+ return xml;
+ },
+
+ noop: function() {},
+
+ // Evaluates a script in a global context
+ // Workarounds based on findings by Jim Driscoll
+ // http://weblogs.java.net/blog/driscoll/archive/2009/09/08/eval-javascript-global-context
+ globalEval: function( data ) {
+ if ( data && rnotwhite.test( data ) ) {
+ // We use execScript on Internet Explorer
+ // We use an anonymous function so that context is window
+ // rather than jQuery in Firefox
+ ( window.execScript || function( data ) {
+ window[ "eval" ].call( window, data );
+ } )( data );
+ }
+ },
+
+ // Convert dashed to camelCase; used by the css and data modules
+ // Microsoft forgot to hump their vendor prefix (#9572)
+ camelCase: function( string ) {
+ return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase );
+ },
+
+ nodeName: function( elem, name ) {
+ return elem.nodeName && elem.nodeName.toUpperCase() === name.toUpperCase();
+ },
+
+ // args is for internal usage only
+ each: function( object, callback, args ) {
+ var name, i = 0,
+ length = object.length,
+ isObj = length === undefined || jQuery.isFunction( object );
+
+ if ( args ) {
+ if ( isObj ) {
+ for ( name in object ) {
+ if ( callback.apply( object[ name ], args ) === false ) {
+ break;
+ }
+ }
+ } else {
+ for ( ; i < length; ) {
+ if ( callback.apply( object[ i++ ], args ) === false ) {
+ break;
+ }
+ }
+ }
+
+ // A special, fast, case for the most common use of each
+ } else {
+ if ( isObj ) {
+ for ( name in object ) {
+ if ( callback.call( object[ name ], name, object[ name ] ) === false ) {
+ break;
+ }
+ }
+ } else {
+ for ( ; i < length; ) {
+ if ( callback.call( object[ i ], i, object[ i++ ] ) === false ) {
+ break;
+ }
+ }
+ }
+ }
+
+ return object;
+ },
+
+ // Use native String.trim function wherever possible
+ trim: trim ?
+ function( text ) {
+ return text == null ?
+ "" :
+ trim.call( text );
+ } :
+
+ // Otherwise use our own trimming functionality
+ function( text ) {
+ return text == null ?
+ "" :
+ text.toString().replace( trimLeft, "" ).replace( trimRight, "" );
+ },
+
+ // results is for internal usage only
+ makeArray: function( array, results ) {
+ var ret = results || [];
+
+ if ( array != null ) {
+ // The window, strings (and functions) also have 'length'
+ // Tweaked logic slightly to handle Blackberry 4.7 RegExp issues #6930
+ var type = jQuery.type( array );
+
+ if ( array.length == null || type === "string" || type === "function" || type === "regexp" || jQuery.isWindow( array ) ) {
+ push.call( ret, array );
+ } else {
+ jQuery.merge( ret, array );
+ }
+ }
+
+ return ret;
+ },
+
+ inArray: function( elem, array, i ) {
+ var len;
+
+ if ( array ) {
+ if ( indexOf ) {
+ return indexOf.call( array, elem, i );
+ }
+
+ len = array.length;
+ i = i ? i < 0 ? Math.max( 0, len + i ) : i : 0;
+
+ for ( ; i < len; i++ ) {
+ // Skip accessing in sparse arrays
+ if ( i in array && array[ i ] === elem ) {
+ return i;
+ }
+ }
+ }
+
+ return -1;
+ },
+
+ merge: function( first, second ) {
+ var i = first.length,
+ j = 0;
+
+ if ( typeof second.length === "number" ) {
+ for ( var l = second.length; j < l; j++ ) {
+ first[ i++ ] = second[ j ];
+ }
+
+ } else {
+ while ( second[j] !== undefined ) {
+ first[ i++ ] = second[ j++ ];
+ }
+ }
+
+ first.length = i;
+
+ return first;
+ },
+
+ grep: function( elems, callback, inv ) {
+ var ret = [], retVal;
+ inv = !!inv;
+
+ // Go through the array, only saving the items
+ // that pass the validator function
+ for ( var i = 0, length = elems.length; i < length; i++ ) {
+ retVal = !!callback( elems[ i ], i );
+ if ( inv !== retVal ) {
+ ret.push( elems[ i ] );
+ }
+ }
+
+ return ret;
+ },
+
+ // arg is for internal usage only
+ map: function( elems, callback, arg ) {
+ var value, key, ret = [],
+ i = 0,
+ length = elems.length,
+ // jquery objects are treated as arrays
+ isArray = elems instanceof jQuery || length !== undefined && typeof length === "number" && ( ( length > 0 && elems[ 0 ] && elems[ length -1 ] ) || length === 0 || jQuery.isArray( elems ) ) ;
+
+ // Go through the array, translating each of the items to their
+ if ( isArray ) {
+ for ( ; i < length; i++ ) {
+ value = callback( elems[ i ], i, arg );
+
+ if ( value != null ) {
+ ret[ ret.length ] = value;
+ }
+ }
+
+ // Go through every key on the object,
+ } else {
+ for ( key in elems ) {
+ value = callback( elems[ key ], key, arg );
+
+ if ( value != null ) {
+ ret[ ret.length ] = value;
+ }
+ }
+ }
+
+ // Flatten any nested arrays
+ return ret.concat.apply( [], ret );
+ },
+
+ // A global GUID counter for objects
+ guid: 1,
+
+ // Bind a function to a context, optionally partially applying any
+ // arguments.
+ proxy: function( fn, context ) {
+ if ( typeof context === "string" ) {
+ var tmp = fn[ context ];
+ context = fn;
+ fn = tmp;
+ }
+
+ // Quick check to determine if target is callable, in the spec
+ // this throws a TypeError, but we will just return undefined.
+ if ( !jQuery.isFunction( fn ) ) {
+ return undefined;
+ }
+
+ // Simulated bind
+ var args = slice.call( arguments, 2 ),
+ proxy = function() {
+ return fn.apply( context, args.concat( slice.call( arguments ) ) );
+ };
+
+ // Set the guid of unique handler to the same of original handler, so it can be removed
+ proxy.guid = fn.guid = fn.guid || proxy.guid || jQuery.guid++;
+
+ return proxy;
+ },
+
+ // Mutifunctional method to get and set values to a collection
+ // The value/s can optionally be executed if it's a function
+ access: function( elems, fn, key, value, chainable, emptyGet, pass ) {
+ var exec,
+ bulk = key == null,
+ i = 0,
+ length = elems.length;
+
+ // Sets many values
+ if ( key && typeof key === "object" ) {
+ for ( i in key ) {
+ jQuery.access( elems, fn, i, key[i], 1, emptyGet, value );
+ }
+ chainable = 1;
+
+ // Sets one value
+ } else if ( value !== undefined ) {
+ // Optionally, function values get executed if exec is true
+ exec = pass === undefined && jQuery.isFunction( value );
+
+ if ( bulk ) {
+ // Bulk operations only iterate when executing function values
+ if ( exec ) {
+ exec = fn;
+ fn = function( elem, key, value ) {
+ return exec.call( jQuery( elem ), value );
+ };
+
+ // Otherwise they run against the entire set
+ } else {
+ fn.call( elems, value );
+ fn = null;
+ }
+ }
+
+ if ( fn ) {
+ for (; i < length; i++ ) {
+ fn( elems[i], key, exec ? value.call( elems[i], i, fn( elems[i], key ) ) : value, pass );
+ }
+ }
+
+ chainable = 1;
+ }
+
+ return chainable ?
+ elems :
+
+ // Gets
+ bulk ?
+ fn.call( elems ) :
+ length ? fn( elems[0], key ) : emptyGet;
+ },
+
+ now: function() {
+ return ( new Date() ).getTime();
+ },
+
+ // Use of jQuery.browser is frowned upon.
+ // More details: http://docs.jquery.com/Utilities/jQuery.browser
+ uaMatch: function( ua ) {
+ ua = ua.toLowerCase();
+
+ var match = rwebkit.exec( ua ) ||
+ ropera.exec( ua ) ||
+ rmsie.exec( ua ) ||
+ ua.indexOf("compatible") < 0 && rmozilla.exec( ua ) ||
+ [];
+
+ return { browser: match[1] || "", version: match[2] || "0" };
+ },
+
+ sub: function() {
+ function jQuerySub( selector, context ) {
+ return new jQuerySub.fn.init( selector, context );
+ }
+ jQuery.extend( true, jQuerySub, this );
+ jQuerySub.superclass = this;
+ jQuerySub.fn = jQuerySub.prototype = this();
+ jQuerySub.fn.constructor = jQuerySub;
+ jQuerySub.sub = this.sub;
+ jQuerySub.fn.init = function init( selector, context ) {
+ if ( context && context instanceof jQuery && !(context instanceof jQuerySub) ) {
+ context = jQuerySub( context );
+ }
+
+ return jQuery.fn.init.call( this, selector, context, rootjQuerySub );
+ };
+ jQuerySub.fn.init.prototype = jQuerySub.fn;
+ var rootjQuerySub = jQuerySub(document);
+ return jQuerySub;
+ },
+
+ browser: {}
+});
+
+// Populate the class2type map
+jQuery.each("Boolean Number String Function Array Date RegExp Object".split(" "), function(i, name) {
+ class2type[ "[object " + name + "]" ] = name.toLowerCase();
+});
+
+browserMatch = jQuery.uaMatch( userAgent );
+if ( browserMatch.browser ) {
+ jQuery.browser[ browserMatch.browser ] = true;
+ jQuery.browser.version = browserMatch.version;
+}
+
+// Deprecated, use jQuery.browser.webkit instead
+if ( jQuery.browser.webkit ) {
+ jQuery.browser.safari = true;
+}
+
+// IE doesn't match non-breaking spaces with \s
+if ( rnotwhite.test( "\xA0" ) ) {
+ trimLeft = /^[\s\xA0]+/;
+ trimRight = /[\s\xA0]+$/;
+}
+
+// All jQuery objects should point back to these
+rootjQuery = jQuery(document);
+
+// Cleanup functions for the document ready method
+if ( document.addEventListener ) {
+ DOMContentLoaded = function() {
+ document.removeEventListener( "DOMContentLoaded", DOMContentLoaded, false );
+ jQuery.ready();
+ };
+
+} else if ( document.attachEvent ) {
+ DOMContentLoaded = function() {
+ // Make sure body exists, at least, in case IE gets a little overzealous (ticket #5443).
+ if ( document.readyState === "complete" ) {
+ document.detachEvent( "onreadystatechange", DOMContentLoaded );
+ jQuery.ready();
+ }
+ };
+}
+
+// The DOM ready check for Internet Explorer
+function doScrollCheck() {
+ if ( jQuery.isReady ) {
+ return;
+ }
+
+ try {
+ // If IE is used, use the trick by Diego Perini
+ // http://javascript.nwbox.com/IEContentLoaded/
+ document.documentElement.doScroll("left");
+ } catch(e) {
+ setTimeout( doScrollCheck, 1 );
+ return;
+ }
+
+ // and execute any waiting functions
+ jQuery.ready();
+}
+
+return jQuery;
+
+})();
+
+
+// String to Object flags format cache
+var flagsCache = {};
+
+// Convert String-formatted flags into Object-formatted ones and store in cache
+function createFlags( flags ) {
+ var object = flagsCache[ flags ] = {},
+ i, length;
+ flags = flags.split( /\s+/ );
+ for ( i = 0, length = flags.length; i < length; i++ ) {
+ object[ flags[i] ] = true;
+ }
+ return object;
+}
+
+/*
+ * Create a callback list using the following parameters:
+ *
+ * flags: an optional list of space-separated flags that will change how
+ * the callback list behaves
+ *
+ * By default a callback list will act like an event callback list and can be
+ * "fired" multiple times.
+ *
+ * Possible flags:
+ *
+ * once: will ensure the callback list can only be fired once (like a Deferred)
+ *
+ * memory: will keep track of previous values and will call any callback added
+ * after the list has been fired right away with the latest "memorized"
+ * values (like a Deferred)
+ *
+ * unique: will ensure a callback can only be added once (no duplicate in the list)
+ *
+ * stopOnFalse: interrupt callings when a callback returns false
+ *
+ */
+jQuery.Callbacks = function( flags ) {
+
+ // Convert flags from String-formatted to Object-formatted
+ // (we check in cache first)
+ flags = flags ? ( flagsCache[ flags ] || createFlags( flags ) ) : {};
+
+ var // Actual callback list
+ list = [],
+ // Stack of fire calls for repeatable lists
+ stack = [],
+ // Last fire value (for non-forgettable lists)
+ memory,
+ // Flag to know if list was already fired
+ fired,
+ // Flag to know if list is currently firing
+ firing,
+ // First callback to fire (used internally by add and fireWith)
+ firingStart,
+ // End of the loop when firing
+ firingLength,
+ // Index of currently firing callback (modified by remove if needed)
+ firingIndex,
+ // Add one or several callbacks to the list
+ add = function( args ) {
+ var i,
+ length,
+ elem,
+ type,
+ actual;
+ for ( i = 0, length = args.length; i < length; i++ ) {
+ elem = args[ i ];
+ type = jQuery.type( elem );
+ if ( type === "array" ) {
+ // Inspect recursively
+ add( elem );
+ } else if ( type === "function" ) {
+ // Add if not in unique mode and callback is not in
+ if ( !flags.unique || !self.has( elem ) ) {
+ list.push( elem );
+ }
+ }
+ }
+ },
+ // Fire callbacks
+ fire = function( context, args ) {
+ args = args || [];
+ memory = !flags.memory || [ context, args ];
+ fired = true;
+ firing = true;
+ firingIndex = firingStart || 0;
+ firingStart = 0;
+ firingLength = list.length;
+ for ( ; list && firingIndex < firingLength; firingIndex++ ) {
+ if ( list[ firingIndex ].apply( context, args ) === false && flags.stopOnFalse ) {
+ memory = true; // Mark as halted
+ break;
+ }
+ }
+ firing = false;
+ if ( list ) {
+ if ( !flags.once ) {
+ if ( stack && stack.length ) {
+ memory = stack.shift();
+ self.fireWith( memory[ 0 ], memory[ 1 ] );
+ }
+ } else if ( memory === true ) {
+ self.disable();
+ } else {
+ list = [];
+ }
+ }
+ },
+ // Actual Callbacks object
+ self = {
+ // Add a callback or a collection of callbacks to the list
+ add: function() {
+ if ( list ) {
+ var length = list.length;
+ add( arguments );
+ // Do we need to add the callbacks to the
+ // current firing batch?
+ if ( firing ) {
+ firingLength = list.length;
+ // With memory, if we're not firing then
+ // we should call right away, unless previous
+ // firing was halted (stopOnFalse)
+ } else if ( memory && memory !== true ) {
+ firingStart = length;
+ fire( memory[ 0 ], memory[ 1 ] );
+ }
+ }
+ return this;
+ },
+ // Remove a callback from the list
+ remove: function() {
+ if ( list ) {
+ var args = arguments,
+ argIndex = 0,
+ argLength = args.length;
+ for ( ; argIndex < argLength ; argIndex++ ) {
+ for ( var i = 0; i < list.length; i++ ) {
+ if ( args[ argIndex ] === list[ i ] ) {
+ // Handle firingIndex and firingLength
+ if ( firing ) {
+ if ( i <= firingLength ) {
+ firingLength--;
+ if ( i <= firingIndex ) {
+ firingIndex--;
+ }
+ }
+ }
+ // Remove the element
+ list.splice( i--, 1 );
+ // If we have some unicity property then
+ // we only need to do this once
+ if ( flags.unique ) {
+ break;
+ }
+ }
+ }
+ }
+ }
+ return this;
+ },
+ // Control if a given callback is in the list
+ has: function( fn ) {
+ if ( list ) {
+ var i = 0,
+ length = list.length;
+ for ( ; i < length; i++ ) {
+ if ( fn === list[ i ] ) {
+ return true;
+ }
+ }
+ }
+ return false;
+ },
+ // Remove all callbacks from the list
+ empty: function() {
+ list = [];
+ return this;
+ },
+ // Have the list do nothing anymore
+ disable: function() {
+ list = stack = memory = undefined;
+ return this;
+ },
+ // Is it disabled?
+ disabled: function() {
+ return !list;
+ },
+ // Lock the list in its current state
+ lock: function() {
+ stack = undefined;
+ if ( !memory || memory === true ) {
+ self.disable();
+ }
+ return this;
+ },
+ // Is it locked?
+ locked: function() {
+ return !stack;
+ },
+ // Call all callbacks with the given context and arguments
+ fireWith: function( context, args ) {
+ if ( stack ) {
+ if ( firing ) {
+ if ( !flags.once ) {
+ stack.push( [ context, args ] );
+ }
+ } else if ( !( flags.once && memory ) ) {
+ fire( context, args );
+ }
+ }
+ return this;
+ },
+ // Call all the callbacks with the given arguments
+ fire: function() {
+ self.fireWith( this, arguments );
+ return this;
+ },
+ // To know if the callbacks have already been called at least once
+ fired: function() {
+ return !!fired;
+ }
+ };
+
+ return self;
+};
+
+
+
+
+var // Static reference to slice
+ sliceDeferred = [].slice;
+
+jQuery.extend({
+
+ Deferred: function( func ) {
+ var doneList = jQuery.Callbacks( "once memory" ),
+ failList = jQuery.Callbacks( "once memory" ),
+ progressList = jQuery.Callbacks( "memory" ),
+ state = "pending",
+ lists = {
+ resolve: doneList,
+ reject: failList,
+ notify: progressList
+ },
+ promise = {
+ done: doneList.add,
+ fail: failList.add,
+ progress: progressList.add,
+
+ state: function() {
+ return state;
+ },
+
+ // Deprecated
+ isResolved: doneList.fired,
+ isRejected: failList.fired,
+
+ then: function( doneCallbacks, failCallbacks, progressCallbacks ) {
+ deferred.done( doneCallbacks ).fail( failCallbacks ).progress( progressCallbacks );
+ return this;
+ },
+ always: function() {
+ deferred.done.apply( deferred, arguments ).fail.apply( deferred, arguments );
+ return this;
+ },
+ pipe: function( fnDone, fnFail, fnProgress ) {
+ return jQuery.Deferred(function( newDefer ) {
+ jQuery.each( {
+ done: [ fnDone, "resolve" ],
+ fail: [ fnFail, "reject" ],
+ progress: [ fnProgress, "notify" ]
+ }, function( handler, data ) {
+ var fn = data[ 0 ],
+ action = data[ 1 ],
+ returned;
+ if ( jQuery.isFunction( fn ) ) {
+ deferred[ handler ](function() {
+ returned = fn.apply( this, arguments );
+ if ( returned && jQuery.isFunction( returned.promise ) ) {
+ returned.promise().then( newDefer.resolve, newDefer.reject, newDefer.notify );
+ } else {
+ newDefer[ action + "With" ]( this === deferred ? newDefer : this, [ returned ] );
+ }
+ });
+ } else {
+ deferred[ handler ]( newDefer[ action ] );
+ }
+ });
+ }).promise();
+ },
+ // Get a promise for this deferred
+ // If obj is provided, the promise aspect is added to the object
+ promise: function( obj ) {
+ if ( obj == null ) {
+ obj = promise;
+ } else {
+ for ( var key in promise ) {
+ obj[ key ] = promise[ key ];
+ }
+ }
+ return obj;
+ }
+ },
+ deferred = promise.promise({}),
+ key;
+
+ for ( key in lists ) {
+ deferred[ key ] = lists[ key ].fire;
+ deferred[ key + "With" ] = lists[ key ].fireWith;
+ }
+
+ // Handle state
+ deferred.done( function() {
+ state = "resolved";
+ }, failList.disable, progressList.lock ).fail( function() {
+ state = "rejected";
+ }, doneList.disable, progressList.lock );
+
+ // Call given func if any
+ if ( func ) {
+ func.call( deferred, deferred );
+ }
+
+ // All done!
+ return deferred;
+ },
+
+ // Deferred helper
+ when: function( firstParam ) {
+ var args = sliceDeferred.call( arguments, 0 ),
+ i = 0,
+ length = args.length,
+ pValues = new Array( length ),
+ count = length,
+ pCount = length,
+ deferred = length <= 1 && firstParam && jQuery.isFunction( firstParam.promise ) ?
+ firstParam :
+ jQuery.Deferred(),
+ promise = deferred.promise();
+ function resolveFunc( i ) {
+ return function( value ) {
+ args[ i ] = arguments.length > 1 ? sliceDeferred.call( arguments, 0 ) : value;
+ if ( !( --count ) ) {
+ deferred.resolveWith( deferred, args );
+ }
+ };
+ }
+ function progressFunc( i ) {
+ return function( value ) {
+ pValues[ i ] = arguments.length > 1 ? sliceDeferred.call( arguments, 0 ) : value;
+ deferred.notifyWith( promise, pValues );
+ };
+ }
+ if ( length > 1 ) {
+ for ( ; i < length; i++ ) {
+ if ( args[ i ] && args[ i ].promise && jQuery.isFunction( args[ i ].promise ) ) {
+ args[ i ].promise().then( resolveFunc(i), deferred.reject, progressFunc(i) );
+ } else {
+ --count;
+ }
+ }
+ if ( !count ) {
+ deferred.resolveWith( deferred, args );
+ }
+ } else if ( deferred !== firstParam ) {
+ deferred.resolveWith( deferred, length ? [ firstParam ] : [] );
+ }
+ return promise;
+ }
+});
+
+
+
+
+jQuery.support = (function() {
+
+ var support,
+ all,
+ a,
+ select,
+ opt,
+ input,
+ fragment,
+ tds,
+ events,
+ eventName,
+ i,
+ isSupported,
+ div = document.createElement( "div" ),
+ documentElement = document.documentElement;
+
+ // Preliminary tests
+ div.setAttribute("className", "t");
+ div.innerHTML = " <link/><table></table><a href='/a' style='top:1px;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
+
+ all = div.getElementsByTagName( "*" );
+ a = div.getElementsByTagName( "a" )[ 0 ];
+
+ // Can't get basic test support
+ if ( !all || !all.length || !a ) {
+ return {};
+ }
+
+ // First batch of supports tests
+ select = document.createElement( "select" );
+ opt = select.appendChild( document.createElement("option") );
+ input = div.getElementsByTagName( "input" )[ 0 ];
+
+ support = {
+ // IE strips leading whitespace when .innerHTML is used
+ leadingWhitespace: ( div.firstChild.nodeType === 3 ),
+
+ // Make sure that tbody elements aren't automatically inserted
+ // IE will insert them into empty tables
+ tbody: !div.getElementsByTagName("tbody").length,
+
+ // Make sure that link elements get serialized correctly by innerHTML
+ // This requires a wrapper element in IE
+ htmlSerialize: !!div.getElementsByTagName("link").length,
+
+ // Get the style information from getAttribute
+ // (IE uses .cssText instead)
+ style: /top/.test( a.getAttribute("style") ),
+
+ // Make sure that URLs aren't manipulated
+ // (IE normalizes it by default)
+ hrefNormalized: ( a.getAttribute("href") === "/a" ),
+
+ // Make sure that element opacity exists
+ // (IE uses filter instead)
+ // Use a regex to work around a WebKit issue. See #5145
+ opacity: /^0.55/.test( a.style.opacity ),
+
+ // Verify style float existence
+ // (IE uses styleFloat instead of cssFloat)
+ cssFloat: !!a.style.cssFloat,
+
+ // Make sure that if no value is specified for a checkbox
+ // that it defaults to "on".
+ // (WebKit defaults to "" instead)
+ checkOn: ( input.value === "on" ),
+
+ // Make sure that a selected-by-default option has a working selected property.
+ // (WebKit defaults to false instead of true, IE too, if it's in an optgroup)
+ optSelected: opt.selected,
+
+ // Test setAttribute on camelCase class. If it works, we need attrFixes when doing get/setAttribute (ie6/7)
+ getSetAttribute: div.className !== "t",
+
+ // Tests for enctype support on a form(#6743)
+ enctype: !!document.createElement("form").enctype,
+
+ // Makes sure cloning an html5 element does not cause problems
+ // Where outerHTML is undefined, this still works
+ html5Clone: document.createElement("nav").cloneNode( true ).outerHTML !== "<:nav></:nav>",
+
+ // Will be defined later
+ submitBubbles: true,
+ changeBubbles: true,
+ focusinBubbles: false,
+ deleteExpando: true,
+ noCloneEvent: true,
+ inlineBlockNeedsLayout: false,
+ shrinkWrapBlocks: false,
+ reliableMarginRight: true,
+ pixelMargin: true
+ };
+
+ // jQuery.boxModel DEPRECATED in 1.3, use jQuery.support.boxModel instead
+ jQuery.boxModel = support.boxModel = (document.compatMode === "CSS1Compat");
+
+ // Make sure checked status is properly cloned
+ input.checked = true;
+ support.noCloneChecked = input.cloneNode( true ).checked;
+
+ // Make sure that the options inside disabled selects aren't marked as disabled
+ // (WebKit marks them as disabled)
+ select.disabled = true;
+ support.optDisabled = !opt.disabled;
+
+ // Test to see if it's possible to delete an expando from an element
+ // Fails in Internet Explorer
+ try {
+ delete div.test;
+ } catch( e ) {
+ support.deleteExpando = false;
+ }
+
+ if ( !div.addEventListener && div.attachEvent && div.fireEvent ) {
+ div.attachEvent( "onclick", function() {
+ // Cloning a node shouldn't copy over any
+ // bound event handlers (IE does this)
+ support.noCloneEvent = false;
+ });
+ div.cloneNode( true ).fireEvent( "onclick" );
+ }
+
+ // Check if a radio maintains its value
+ // after being appended to the DOM
+ input = document.createElement("input");
+ input.value = "t";
+ input.setAttribute("type", "radio");
+ support.radioValue = input.value === "t";
+
+ input.setAttribute("checked", "checked");
+
+ // #11217 - WebKit loses check when the name is after the checked attribute
+ input.setAttribute( "name", "t" );
+
+ div.appendChild( input );
+ fragment = document.createDocumentFragment();
+ fragment.appendChild( div.lastChild );
+
+ // WebKit doesn't clone checked state correctly in fragments
+ support.checkClone = fragment.cloneNode( true ).cloneNode( true ).lastChild.checked;
+
+ // Check if a disconnected checkbox will retain its checked
+ // value of true after appended to the DOM (IE6/7)
+ support.appendChecked = input.checked;
+
+ fragment.removeChild( input );
+ fragment.appendChild( div );
+
+ // Technique from Juriy Zaytsev
+ // http://perfectionkills.com/detecting-event-support-without-browser-sniffing/
+ // We only care about the case where non-standard event systems
+ // are used, namely in IE. Short-circuiting here helps us to
+ // avoid an eval call (in setAttribute) which can cause CSP
+ // to go haywire. See: https://developer.mozilla.org/en/Security/CSP
+ if ( div.attachEvent ) {
+ for ( i in {
+ submit: 1,
+ change: 1,
+ focusin: 1
+ }) {
+ eventName = "on" + i;
+ isSupported = ( eventName in div );
+ if ( !isSupported ) {
+ div.setAttribute( eventName, "return;" );
+ isSupported = ( typeof div[ eventName ] === "function" );
+ }
+ support[ i + "Bubbles" ] = isSupported;
+ }
+ }
+
+ fragment.removeChild( div );
+
+ // Null elements to avoid leaks in IE
+ fragment = select = opt = div = input = null;
+
+ // Run tests that need a body at doc ready
+ jQuery(function() {
+ var container, outer, inner, table, td, offsetSupport,
+ marginDiv, conMarginTop, style, html, positionTopLeftWidthHeight,
+ paddingMarginBorderVisibility, paddingMarginBorder,
+ body = document.getElementsByTagName("body")[0];
+
+ if ( !body ) {
+ // Return for frameset docs that don't have a body
+ return;
+ }
+
+ conMarginTop = 1;
+ paddingMarginBorder = "padding:0;margin:0;border:";
+ positionTopLeftWidthHeight = "position:absolute;top:0;left:0;width:1px;height:1px;";
+ paddingMarginBorderVisibility = paddingMarginBorder + "0;visibility:hidden;";
+ style = "style='" + positionTopLeftWidthHeight + paddingMarginBorder + "5px solid #000;";
+ html = "<div " + style + "display:block;'><div style='" + paddingMarginBorder + "0;display:block;overflow:hidden;'></div></div>" +
+ "<table " + style + "' cellpadding='0' cellspacing='0'>" +
+ "<tr><td></td></tr></table>";
+
+ container = document.createElement("div");
+ container.style.cssText = paddingMarginBorderVisibility + "width:0;height:0;position:static;top:0;margin-top:" + conMarginTop + "px";
+ body.insertBefore( container, body.firstChild );
+
+ // Construct the test element
+ div = document.createElement("div");
+ container.appendChild( div );
+
+ // Check if table cells still have offsetWidth/Height when they are set
+ // to display:none and there are still other visible table cells in a
+ // table row; if so, offsetWidth/Height are not reliable for use when
+ // determining if an element has been hidden directly using
+ // display:none (it is still safe to use offsets if a parent element is
+ // hidden; don safety goggles and see bug #4512 for more information).
+ // (only IE 8 fails this test)
+ div.innerHTML = "<table><tr><td style='" + paddingMarginBorder + "0;display:none'></td><td>t</td></tr></table>";
+ tds = div.getElementsByTagName( "td" );
+ isSupported = ( tds[ 0 ].offsetHeight === 0 );
+
+ tds[ 0 ].style.display = "";
+ tds[ 1 ].style.display = "none";
+
+ // Check if empty table cells still have offsetWidth/Height
+ // (IE <= 8 fail this test)
+ support.reliableHiddenOffsets = isSupported && ( tds[ 0 ].offsetHeight === 0 );
+
+ // Check if div with explicit width and no margin-right incorrectly
+ // gets computed margin-right based on width of container. For more
+ // info see bug #3333
+ // Fails in WebKit before Feb 2011 nightlies
+ // WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
+ if ( window.getComputedStyle ) {
+ div.innerHTML = "";
+ marginDiv = document.createElement( "div" );
+ marginDiv.style.width = "0";
+ marginDiv.style.marginRight = "0";
+ div.style.width = "2px";
+ div.appendChild( marginDiv );
+ support.reliableMarginRight =
+ ( parseInt( ( window.getComputedStyle( marginDiv, null ) || { marginRight: 0 } ).marginRight, 10 ) || 0 ) === 0;
+ }
+
+ if ( typeof div.style.zoom !== "undefined" ) {
+ // Check if natively block-level elements act like inline-block
+ // elements when setting their display to 'inline' and giving
+ // them layout
+ // (IE < 8 does this)
+ div.innerHTML = "";
+ div.style.width = div.style.padding = "1px";
+ div.style.border = 0;
+ div.style.overflow = "hidden";
+ div.style.display = "inline";
+ div.style.zoom = 1;
+ support.inlineBlockNeedsLayout = ( div.offsetWidth === 3 );
+
+ // Check if elements with layout shrink-wrap their children
+ // (IE 6 does this)
+ div.style.display = "block";
+ div.style.overflow = "visible";
+ div.innerHTML = "<div style='width:5px;'></div>";
+ support.shrinkWrapBlocks = ( div.offsetWidth !== 3 );
+ }
+
+ div.style.cssText = positionTopLeftWidthHeight + paddingMarginBorderVisibility;
+ div.innerHTML = html;
+
+ outer = div.firstChild;
+ inner = outer.firstChild;
+ td = outer.nextSibling.firstChild.firstChild;
+
+ offsetSupport = {
+ doesNotAddBorder: ( inner.offsetTop !== 5 ),
+ doesAddBorderForTableAndCells: ( td.offsetTop === 5 )
+ };
+
+ inner.style.position = "fixed";
+ inner.style.top = "20px";
+
+ // safari subtracts parent border width here which is 5px
+ offsetSupport.fixedPosition = ( inner.offsetTop === 20 || inner.offsetTop === 15 );
+ inner.style.position = inner.style.top = "";
+
+ outer.style.overflow = "hidden";
+ outer.style.position = "relative";
+
+ offsetSupport.subtractsBorderForOverflowNotVisible = ( inner.offsetTop === -5 );
+ offsetSupport.doesNotIncludeMarginInBodyOffset = ( body.offsetTop !== conMarginTop );
+
+ if ( window.getComputedStyle ) {
+ div.style.marginTop = "1%";
+ support.pixelMargin = ( window.getComputedStyle( div, null ) || { marginTop: 0 } ).marginTop !== "1%";
+ }
+
+ if ( typeof container.style.zoom !== "undefined" ) {
+ container.style.zoom = 1;
+ }
+
+ body.removeChild( container );
+ marginDiv = div = container = null;
+
+ jQuery.extend( support, offsetSupport );
+ });
+
+ return support;
+})();
+
+
+
+
+var rbrace = /^(?:\{.*\}|\[.*\])$/,
+ rmultiDash = /([A-Z])/g;
+
+jQuery.extend({
+ cache: {},
+
+ // Please use with caution
+ uuid: 0,
+
+ // Unique for each copy of jQuery on the page
+ // Non-digits removed to match rinlinejQuery
+ expando: "jQuery" + ( jQuery.fn.jquery + Math.random() ).replace( /\D/g, "" ),
+
+ // The following elements throw uncatchable exceptions if you
+ // attempt to add expando properties to them.
+ noData: {
+ "embed": true,
+ // Ban all objects except for Flash (which handle expandos)
+ "object": "clsid:D27CDB6E-AE6D-11cf-96B8-444553540000",
+ "applet": true
+ },
+
+ hasData: function( elem ) {
+ elem = elem.nodeType ? jQuery.cache[ elem[jQuery.expando] ] : elem[ jQuery.expando ];
+ return !!elem && !isEmptyDataObject( elem );
+ },
+
+ data: function( elem, name, data, pvt /* Internal Use Only */ ) {
+ if ( !jQuery.acceptData( elem ) ) {
+ return;
+ }
+
+ var privateCache, thisCache, ret,
+ internalKey = jQuery.expando,
+ getByName = typeof name === "string",
+
+ // We have to handle DOM nodes and JS objects differently because IE6-7
+ // can't GC object references properly across the DOM-JS boundary
+ isNode = elem.nodeType,
+
+ // Only DOM nodes need the global jQuery cache; JS object data is
+ // attached directly to the object so GC can occur automatically
+ cache = isNode ? jQuery.cache : elem,
+
+ // Only defining an ID for JS objects if its cache already exists allows
+ // the code to shortcut on the same path as a DOM node with no cache
+ id = isNode ? elem[ internalKey ] : elem[ internalKey ] && internalKey,
+ isEvents = name === "events";
+
+ // Avoid doing any more work than we need to when trying to get data on an
+ // object that has no data at all
+ if ( (!id || !cache[id] || (!isEvents && !pvt && !cache[id].data)) && getByName && data === undefined ) {
+ return;
+ }
+
+ if ( !id ) {
+ // Only DOM nodes need a new unique ID for each element since their data
+ // ends up in the global cache
+ if ( isNode ) {
+ elem[ internalKey ] = id = ++jQuery.uuid;
+ } else {
+ id = internalKey;
+ }
+ }
+
+ if ( !cache[ id ] ) {
+ cache[ id ] = {};
+
+ // Avoids exposing jQuery metadata on plain JS objects when the object
+ // is serialized using JSON.stringify
+ if ( !isNode ) {
+ cache[ id ].toJSON = jQuery.noop;
+ }
+ }
+
+ // An object can be passed to jQuery.data instead of a key/value pair; this gets
+ // shallow copied over onto the existing cache
+ if ( typeof name === "object" || typeof name === "function" ) {
+ if ( pvt ) {
+ cache[ id ] = jQuery.extend( cache[ id ], name );
+ } else {
+ cache[ id ].data = jQuery.extend( cache[ id ].data, name );
+ }
+ }
+
+ privateCache = thisCache = cache[ id ];
+
+ // jQuery data() is stored in a separate object inside the object's internal data
+ // cache in order to avoid key collisions between internal data and user-defined
+ // data.
+ if ( !pvt ) {
+ if ( !thisCache.data ) {
+ thisCache.data = {};
+ }
+
+ thisCache = thisCache.data;
+ }
+
+ if ( data !== undefined ) {
+ thisCache[ jQuery.camelCase( name ) ] = data;
+ }
+
+ // Users should not attempt to inspect the internal events object using jQuery.data,
+ // it is undocumented and subject to change. But does anyone listen? No.
+ if ( isEvents && !thisCache[ name ] ) {
+ return privateCache.events;
+ }
+
+ // Check for both converted-to-camel and non-converted data property names
+ // If a data property was specified
+ if ( getByName ) {
+
+ // First Try to find as-is property data
+ ret = thisCache[ name ];
+
+ // Test for null|undefined property data
+ if ( ret == null ) {
+
+ // Try to find the camelCased property
+ ret = thisCache[ jQuery.camelCase( name ) ];
+ }
+ } else {
+ ret = thisCache;
+ }
+
+ return ret;
+ },
+
+ removeData: function( elem, name, pvt /* Internal Use Only */ ) {
+ if ( !jQuery.acceptData( elem ) ) {
+ return;
+ }
+
+ var thisCache, i, l,
+
+ // Reference to internal data cache key
+ internalKey = jQuery.expando,
+
+ isNode = elem.nodeType,
+
+ // See jQuery.data for more information
+ cache = isNode ? jQuery.cache : elem,
+
+ // See jQuery.data for more information
+ id = isNode ? elem[ internalKey ] : internalKey;
+
+ // If there is already no cache entry for this object, there is no
+ // purpose in continuing
+ if ( !cache[ id ] ) {
+ return;
+ }
+
+ if ( name ) {
+
+ thisCache = pvt ? cache[ id ] : cache[ id ].data;
+
+ if ( thisCache ) {
+
+ // Support array or space separated string names for data keys
+ if ( !jQuery.isArray( name ) ) {
+
+ // try the string as a key before any manipulation
+ if ( name in thisCache ) {
+ name = [ name ];
+ } else {
+
+ // split the camel cased version by spaces unless a key with the spaces exists
+ name = jQuery.camelCase( name );
+ if ( name in thisCache ) {
+ name = [ name ];
+ } else {
+ name = name.split( " " );
+ }
+ }
+ }
+
+ for ( i = 0, l = name.length; i < l; i++ ) {
+ delete thisCache[ name[i] ];
+ }
+
+ // If there is no data left in the cache, we want to continue
+ // and let the cache object itself get destroyed
+ if ( !( pvt ? isEmptyDataObject : jQuery.isEmptyObject )( thisCache ) ) {
+ return;
+ }
+ }
+ }
+
+ // See jQuery.data for more information
+ if ( !pvt ) {
+ delete cache[ id ].data;
+
+ // Don't destroy the parent cache unless the internal data object
+ // had been the only thing left in it
+ if ( !isEmptyDataObject(cache[ id ]) ) {
+ return;
+ }
+ }
+
+ // Browsers that fail expando deletion also refuse to delete expandos on
+ // the window, but it will allow it on all other JS objects; other browsers
+ // don't care
+ // Ensure that `cache` is not a window object #10080
+ if ( jQuery.support.deleteExpando || !cache.setInterval ) {
+ delete cache[ id ];
+ } else {
+ cache[ id ] = null;
+ }
+
+ // We destroyed the cache and need to eliminate the expando on the node to avoid
+ // false lookups in the cache for entries that no longer exist
+ if ( isNode ) {
+ // IE does not allow us to delete expando properties from nodes,
+ // nor does it have a removeAttribute function on Document nodes;
+ // we must handle all of these cases
+ if ( jQuery.support.deleteExpando ) {
+ delete elem[ internalKey ];
+ } else if ( elem.removeAttribute ) {
+ elem.removeAttribute( internalKey );
+ } else {
+ elem[ internalKey ] = null;
+ }
+ }
+ },
+
+ // For internal use only.
+ _data: function( elem, name, data ) {
+ return jQuery.data( elem, name, data, true );
+ },
+
+ // A method for determining if a DOM node can handle the data expando
+ acceptData: function( elem ) {
+ if ( elem.nodeName ) {
+ var match = jQuery.noData[ elem.nodeName.toLowerCase() ];
+
+ if ( match ) {
+ return !(match === true || elem.getAttribute("classid") !== match);
+ }
+ }
+
+ return true;
+ }
+});
+
+jQuery.fn.extend({
+ data: function( key, value ) {
+ var parts, part, attr, name, l,
+ elem = this[0],
+ i = 0,
+ data = null;
+
+ // Gets all values
+ if ( key === undefined ) {
+ if ( this.length ) {
+ data = jQuery.data( elem );
+
+ if ( elem.nodeType === 1 && !jQuery._data( elem, "parsedAttrs" ) ) {
+ attr = elem.attributes;
+ for ( l = attr.length; i < l; i++ ) {
+ name = attr[i].name;
+
+ if ( name.indexOf( "data-" ) === 0 ) {
+ name = jQuery.camelCase( name.substring(5) );
+
+ dataAttr( elem, name, data[ name ] );
+ }
+ }
+ jQuery._data( elem, "parsedAttrs", true );
+ }
+ }
+
+ return data;
+ }
+
+ // Sets multiple values
+ if ( typeof key === "object" ) {
+ return this.each(function() {
+ jQuery.data( this, key );
+ });
+ }
+
+ parts = key.split( ".", 2 );
+ parts[1] = parts[1] ? "." + parts[1] : "";
+ part = parts[1] + "!";
+
+ return jQuery.access( this, function( value ) {
+
+ if ( value === undefined ) {
+ data = this.triggerHandler( "getData" + part, [ parts[0] ] );
+
+ // Try to fetch any internally stored data first
+ if ( data === undefined && elem ) {
+ data = jQuery.data( elem, key );
+ data = dataAttr( elem, key, data );
+ }
+
+ return data === undefined && parts[1] ?
+ this.data( parts[0] ) :
+ data;
+ }
+
+ parts[1] = value;
+ this.each(function() {
+ var self = jQuery( this );
+
+ self.triggerHandler( "setData" + part, parts );
+ jQuery.data( this, key, value );
+ self.triggerHandler( "changeData" + part, parts );
+ });
+ }, null, value, arguments.length > 1, null, false );
+ },
+
+ removeData: function( key ) {
+ return this.each(function() {
+ jQuery.removeData( this, key );
+ });
+ }
+});
+
+function dataAttr( elem, key, data ) {
+ // If nothing was found internally, try to fetch any
+ // data from the HTML5 data-* attribute
+ if ( data === undefined && elem.nodeType === 1 ) {
+
+ var name = "data-" + key.replace( rmultiDash, "-$1" ).toLowerCase();
+
+ data = elem.getAttribute( name );
+
+ if ( typeof data === "string" ) {
+ try {
+ data = data === "true" ? true :
+ data === "false" ? false :
+ data === "null" ? null :
+ jQuery.isNumeric( data ) ? +data :
+ rbrace.test( data ) ? jQuery.parseJSON( data ) :
+ data;
+ } catch( e ) {}
+
+ // Make sure we set the data so it isn't changed later
+ jQuery.data( elem, key, data );
+
+ } else {
+ data = undefined;
+ }
+ }
+
+ return data;
+}
+
+// checks a cache object for emptiness
+function isEmptyDataObject( obj ) {
+ for ( var name in obj ) {
+
+ // if the public data object is empty, the private is still empty
+ if ( name === "data" && jQuery.isEmptyObject( obj[name] ) ) {
+ continue;
+ }
+ if ( name !== "toJSON" ) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+
+
+
+function handleQueueMarkDefer( elem, type, src ) {
+ var deferDataKey = type + "defer",
+ queueDataKey = type + "queue",
+ markDataKey = type + "mark",
+ defer = jQuery._data( elem, deferDataKey );
+ if ( defer &&
+ ( src === "queue" || !jQuery._data(elem, queueDataKey) ) &&
+ ( src === "mark" || !jQuery._data(elem, markDataKey) ) ) {
+ // Give room for hard-coded callbacks to fire first
+ // and eventually mark/queue something else on the element
+ setTimeout( function() {
+ if ( !jQuery._data( elem, queueDataKey ) &&
+ !jQuery._data( elem, markDataKey ) ) {
+ jQuery.removeData( elem, deferDataKey, true );
+ defer.fire();
+ }
+ }, 0 );
+ }
+}
+
+jQuery.extend({
+
+ _mark: function( elem, type ) {
+ if ( elem ) {
+ type = ( type || "fx" ) + "mark";
+ jQuery._data( elem, type, (jQuery._data( elem, type ) || 0) + 1 );
+ }
+ },
+
+ _unmark: function( force, elem, type ) {
+ if ( force !== true ) {
+ type = elem;
+ elem = force;
+ force = false;
+ }
+ if ( elem ) {
+ type = type || "fx";
+ var key = type + "mark",
+ count = force ? 0 : ( (jQuery._data( elem, key ) || 1) - 1 );
+ if ( count ) {
+ jQuery._data( elem, key, count );
+ } else {
+ jQuery.removeData( elem, key, true );
+ handleQueueMarkDefer( elem, type, "mark" );
+ }
+ }
+ },
+
+ queue: function( elem, type, data ) {
+ var q;
+ if ( elem ) {
+ type = ( type || "fx" ) + "queue";
+ q = jQuery._data( elem, type );
+
+ // Speed up dequeue by getting out quickly if this is just a lookup
+ if ( data ) {
+ if ( !q || jQuery.isArray(data) ) {
+ q = jQuery._data( elem, type, jQuery.makeArray(data) );
+ } else {
+ q.push( data );
+ }
+ }
+ return q || [];
+ }
+ },
+
+ dequeue: function( elem, type ) {
+ type = type || "fx";
+
+ var queue = jQuery.queue( elem, type ),
+ fn = queue.shift(),
+ hooks = {};
+
+ // If the fx queue is dequeued, always remove the progress sentinel
+ if ( fn === "inprogress" ) {
+ fn = queue.shift();
+ }
+
+ if ( fn ) {
+ // Add a progress sentinel to prevent the fx queue from being
+ // automatically dequeued
+ if ( type === "fx" ) {
+ queue.unshift( "inprogress" );
+ }
+
+ jQuery._data( elem, type + ".run", hooks );
+ fn.call( elem, function() {
+ jQuery.dequeue( elem, type );
+ }, hooks );
+ }
+
+ if ( !queue.length ) {
+ jQuery.removeData( elem, type + "queue " + type + ".run", true );
+ handleQueueMarkDefer( elem, type, "queue" );
+ }
+ }
+});
+
+jQuery.fn.extend({
+ queue: function( type, data ) {
+ var setter = 2;
+
+ if ( typeof type !== "string" ) {
+ data = type;
+ type = "fx";
+ setter--;
+ }
+
+ if ( arguments.length < setter ) {
+ return jQuery.queue( this[0], type );
+ }
+
+ return data === undefined ?
+ this :
+ this.each(function() {
+ var queue = jQuery.queue( this, type, data );
+
+ if ( type === "fx" && queue[0] !== "inprogress" ) {
+ jQuery.dequeue( this, type );
+ }
+ });
+ },
+ dequeue: function( type ) {
+ return this.each(function() {
+ jQuery.dequeue( this, type );
+ });
+ },
+ // Based off of the plugin by Clint Helfers, with permission.
+ // http://blindsignals.com/index.php/2009/07/jquery-delay/
+ delay: function( time, type ) {
+ time = jQuery.fx ? jQuery.fx.speeds[ time ] || time : time;
+ type = type || "fx";
+
+ return this.queue( type, function( next, hooks ) {
+ var timeout = setTimeout( next, time );
+ hooks.stop = function() {
+ clearTimeout( timeout );
+ };
+ });
+ },
+ clearQueue: function( type ) {
+ return this.queue( type || "fx", [] );
+ },
+ // Get a promise resolved when queues of a certain type
+ // are emptied (fx is the type by default)
+ promise: function( type, object ) {
+ if ( typeof type !== "string" ) {
+ object = type;
+ type = undefined;
+ }
+ type = type || "fx";
+ var defer = jQuery.Deferred(),
+ elements = this,
+ i = elements.length,
+ count = 1,
+ deferDataKey = type + "defer",
+ queueDataKey = type + "queue",
+ markDataKey = type + "mark",
+ tmp;
+ function resolve() {
+ if ( !( --count ) ) {
+ defer.resolveWith( elements, [ elements ] );
+ }
+ }
+ while( i-- ) {
+ if (( tmp = jQuery.data( elements[ i ], deferDataKey, undefined, true ) ||
+ ( jQuery.data( elements[ i ], queueDataKey, undefined, true ) ||
+ jQuery.data( elements[ i ], markDataKey, undefined, true ) ) &&
+ jQuery.data( elements[ i ], deferDataKey, jQuery.Callbacks( "once memory" ), true ) )) {
+ count++;
+ tmp.add( resolve );
+ }
+ }
+ resolve();
+ return defer.promise( object );
+ }
+});
+
+
+
+
+var rclass = /[\n\t\r]/g,
+ rspace = /\s+/,
+ rreturn = /\r/g,
+ rtype = /^(?:button|input)$/i,
+ rfocusable = /^(?:button|input|object|select|textarea)$/i,
+ rclickable = /^a(?:rea)?$/i,
+ rboolean = /^(?:autofocus|autoplay|async|checked|controls|defer|disabled|hidden|loop|multiple|open|readonly|required|scoped|selected)$/i,
+ getSetAttribute = jQuery.support.getSetAttribute,
+ nodeHook, boolHook, fixSpecified;
+
+jQuery.fn.extend({
+ attr: function( name, value ) {
+ return jQuery.access( this, jQuery.attr, name, value, arguments.length > 1 );
+ },
+
+ removeAttr: function( name ) {
+ return this.each(function() {
+ jQuery.removeAttr( this, name );
+ });
+ },
+
+ prop: function( name, value ) {
+ return jQuery.access( this, jQuery.prop, name, value, arguments.length > 1 );
+ },
+
+ removeProp: function( name ) {
+ name = jQuery.propFix[ name ] || name;
+ return this.each(function() {
+ // try/catch handles cases where IE balks (such as removing a property on window)
+ try {
+ this[ name ] = undefined;
+ delete this[ name ];
+ } catch( e ) {}
+ });
+ },
+
+ addClass: function( value ) {
+ var classNames, i, l, elem,
+ setClass, c, cl;
+
+ if ( jQuery.isFunction( value ) ) {
+ return this.each(function( j ) {
+ jQuery( this ).addClass( value.call(this, j, this.className) );
+ });
+ }
+
+ if ( value && typeof value === "string" ) {
+ classNames = value.split( rspace );
+
+ for ( i = 0, l = this.length; i < l; i++ ) {
+ elem = this[ i ];
+
+ if ( elem.nodeType === 1 ) {
+ if ( !elem.className && classNames.length === 1 ) {
+ elem.className = value;
+
+ } else {
+ setClass = " " + elem.className + " ";
+
+ for ( c = 0, cl = classNames.length; c < cl; c++ ) {
+ if ( !~setClass.indexOf( " " + classNames[ c ] + " " ) ) {
+ setClass += classNames[ c ] + " ";
+ }
+ }
+ elem.className = jQuery.trim( setClass );
+ }
+ }
+ }
+ }
+
+ return this;
+ },
+
+ removeClass: function( value ) {
+ var classNames, i, l, elem, className, c, cl;
+
+ if ( jQuery.isFunction( value ) ) {
+ return this.each(function( j ) {
+ jQuery( this ).removeClass( value.call(this, j, this.className) );
+ });
+ }
+
+ if ( (value && typeof value === "string") || value === undefined ) {
+ classNames = ( value || "" ).split( rspace );
+
+ for ( i = 0, l = this.length; i < l; i++ ) {
+ elem = this[ i ];
+
+ if ( elem.nodeType === 1 && elem.className ) {
+ if ( value ) {
+ className = (" " + elem.className + " ").replace( rclass, " " );
+ for ( c = 0, cl = classNames.length; c < cl; c++ ) {
+ className = className.replace(" " + classNames[ c ] + " ", " ");
+ }
+ elem.className = jQuery.trim( className );
+
+ } else {
+ elem.className = "";
+ }
+ }
+ }
+ }
+
+ return this;
+ },
+
+ toggleClass: function( value, stateVal ) {
+ var type = typeof value,
+ isBool = typeof stateVal === "boolean";
+
+ if ( jQuery.isFunction( value ) ) {
+ return this.each(function( i ) {
+ jQuery( this ).toggleClass( value.call(this, i, this.className, stateVal), stateVal );
+ });
+ }
+
+ return this.each(function() {
+ if ( type === "string" ) {
+ // toggle individual class names
+ var className,
+ i = 0,
+ self = jQuery( this ),
+ state = stateVal,
+ classNames = value.split( rspace );
+
+ while ( (className = classNames[ i++ ]) ) {
+ // check each className given, space seperated list
+ state = isBool ? state : !self.hasClass( className );
+ self[ state ? "addClass" : "removeClass" ]( className );
+ }
+
+ } else if ( type === "undefined" || type === "boolean" ) {
+ if ( this.className ) {
+ // store className if set
+ jQuery._data( this, "__className__", this.className );
+ }
+
+ // toggle whole className
+ this.className = this.className || value === false ? "" : jQuery._data( this, "__className__" ) || "";
+ }
+ });
+ },
+
+ hasClass: function( selector ) {
+ var className = " " + selector + " ",
+ i = 0,
+ l = this.length;
+ for ( ; i < l; i++ ) {
+ if ( this[i].nodeType === 1 && (" " + this[i].className + " ").replace(rclass, " ").indexOf( className ) > -1 ) {
+ return true;
+ }
+ }
+
+ return false;
+ },
+
+ val: function( value ) {
+ var hooks, ret, isFunction,
+ elem = this[0];
+
+ if ( !arguments.length ) {
+ if ( elem ) {
+ hooks = jQuery.valHooks[ elem.type ] || jQuery.valHooks[ elem.nodeName.toLowerCase() ];
+
+ if ( hooks && "get" in hooks && (ret = hooks.get( elem, "value" )) !== undefined ) {
+ return ret;
+ }
+
+ ret = elem.value;
+
+ return typeof ret === "string" ?
+ // handle most common string cases
+ ret.replace(rreturn, "") :
+ // handle cases where value is null/undef or number
+ ret == null ? "" : ret;
+ }
+
+ return;
+ }
+
+ isFunction = jQuery.isFunction( value );
+
+ return this.each(function( i ) {
+ var self = jQuery(this), val;
+
+ if ( this.nodeType !== 1 ) {
+ return;
+ }
+
+ if ( isFunction ) {
+ val = value.call( this, i, self.val() );
+ } else {
+ val = value;
+ }
+
+ // Treat null/undefined as ""; convert numbers to string
+ if ( val == null ) {
+ val = "";
+ } else if ( typeof val === "number" ) {
+ val += "";
+ } else if ( jQuery.isArray( val ) ) {
+ val = jQuery.map(val, function ( value ) {
+ return value == null ? "" : value + "";
+ });
+ }
+
+ hooks = jQuery.valHooks[ this.type ] || jQuery.valHooks[ this.nodeName.toLowerCase() ];
+
+ // If set returns undefined, fall back to normal setting
+ if ( !hooks || !("set" in hooks) || hooks.set( this, val, "value" ) === undefined ) {
+ this.value = val;
+ }
+ });
+ }
+});
+
+jQuery.extend({
+ valHooks: {
+ option: {
+ get: function( elem ) {
+ // attributes.value is undefined in Blackberry 4.7 but
+ // uses .value. See #6932
+ var val = elem.attributes.value;
+ return !val || val.specified ? elem.value : elem.text;
+ }
+ },
+ select: {
+ get: function( elem ) {
+ var value, i, max, option,
+ index = elem.selectedIndex,
+ values = [],
+ options = elem.options,
+ one = elem.type === "select-one";
+
+ // Nothing was selected
+ if ( index < 0 ) {
+ return null;
+ }
+
+ // Loop through all the selected options
+ i = one ? index : 0;
+ max = one ? index + 1 : options.length;
+ for ( ; i < max; i++ ) {
+ option = options[ i ];
+
+ // Don't return options that are disabled or in a disabled optgroup
+ if ( option.selected && (jQuery.support.optDisabled ? !option.disabled : option.getAttribute("disabled") === null) &&
+ (!option.parentNode.disabled || !jQuery.nodeName( option.parentNode, "optgroup" )) ) {
+
+ // Get the specific value for the option
+ value = jQuery( option ).val();
+
+ // We don't need an array for one selects
+ if ( one ) {
+ return value;
+ }
+
+ // Multi-Selects return an array
+ values.push( value );
+ }
+ }
+
+ // Fixes Bug #2551 -- select.val() broken in IE after form.reset()
+ if ( one && !values.length && options.length ) {
+ return jQuery( options[ index ] ).val();
+ }
+
+ return values;
+ },
+
+ set: function( elem, value ) {
+ var values = jQuery.makeArray( value );
+
+ jQuery(elem).find("option").each(function() {
+ this.selected = jQuery.inArray( jQuery(this).val(), values ) >= 0;
+ });
+
+ if ( !values.length ) {
+ elem.selectedIndex = -1;
+ }
+ return values;
+ }
+ }
+ },
+
+ attrFn: {
+ val: true,
+ css: true,
+ html: true,
+ text: true,
+ data: true,
+ width: true,
+ height: true,
+ offset: true
+ },
+
+ attr: function( elem, name, value, pass ) {
+ var ret, hooks, notxml,
+ nType = elem.nodeType;
+
+ // don't get/set attributes on text, comment and attribute nodes
+ if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
+ return;
+ }
+
+ if ( pass && name in jQuery.attrFn ) {
+ return jQuery( elem )[ name ]( value );
+ }
+
+ // Fallback to prop when attributes are not supported
+ if ( typeof elem.getAttribute === "undefined" ) {
+ return jQuery.prop( elem, name, value );
+ }
+
+ notxml = nType !== 1 || !jQuery.isXMLDoc( elem );
+
+ // All attributes are lowercase
+ // Grab necessary hook if one is defined
+ if ( notxml ) {
+ name = name.toLowerCase();
+ hooks = jQuery.attrHooks[ name ] || ( rboolean.test( name ) ? boolHook : nodeHook );
+ }
+
+ if ( value !== undefined ) {
+
+ if ( value === null ) {
+ jQuery.removeAttr( elem, name );
+ return;
+
+ } else if ( hooks && "set" in hooks && notxml && (ret = hooks.set( elem, value, name )) !== undefined ) {
+ return ret;
+
+ } else {
+ elem.setAttribute( name, "" + value );
+ return value;
+ }
+
+ } else if ( hooks && "get" in hooks && notxml && (ret = hooks.get( elem, name )) !== null ) {
+ return ret;
+
+ } else {
+
+ ret = elem.getAttribute( name );
+
+ // Non-existent attributes return null, we normalize to undefined
+ return ret === null ?
+ undefined :
+ ret;
+ }
+ },
+
+ removeAttr: function( elem, value ) {
+ var propName, attrNames, name, l, isBool,
+ i = 0;
+
+ if ( value && elem.nodeType === 1 ) {
+ attrNames = value.toLowerCase().split( rspace );
+ l = attrNames.length;
+
+ for ( ; i < l; i++ ) {
+ name = attrNames[ i ];
+
+ if ( name ) {
+ propName = jQuery.propFix[ name ] || name;
+ isBool = rboolean.test( name );
+
+ // See #9699 for explanation of this approach (setting first, then removal)
+ // Do not do this for boolean attributes (see #10870)
+ if ( !isBool ) {
+ jQuery.attr( elem, name, "" );
+ }
+ elem.removeAttribute( getSetAttribute ? name : propName );
+
+ // Set corresponding property to false for boolean attributes
+ if ( isBool && propName in elem ) {
+ elem[ propName ] = false;
+ }
+ }
+ }
+ }
+ },
+
+ attrHooks: {
+ type: {
+ set: function( elem, value ) {
+ // We can't allow the type property to be changed (since it causes problems in IE)
+ if ( rtype.test( elem.nodeName ) && elem.parentNode ) {
+ jQuery.error( "type property can't be changed" );
+ } else if ( !jQuery.support.radioValue && value === "radio" && jQuery.nodeName(elem, "input") ) {
+ // Setting the type on a radio button after the value resets the value in IE6-9
+ // Reset value to it's default in case type is set after value
+ // This is for element creation
+ var val = elem.value;
+ elem.setAttribute( "type", value );
+ if ( val ) {
+ elem.value = val;
+ }
+ return value;
+ }
+ }
+ },
+ // Use the value property for back compat
+ // Use the nodeHook for button elements in IE6/7 (#1954)
+ value: {
+ get: function( elem, name ) {
+ if ( nodeHook && jQuery.nodeName( elem, "button" ) ) {
+ return nodeHook.get( elem, name );
+ }
+ return name in elem ?
+ elem.value :
+ null;
+ },
+ set: function( elem, value, name ) {
+ if ( nodeHook && jQuery.nodeName( elem, "button" ) ) {
+ return nodeHook.set( elem, value, name );
+ }
+ // Does not return so that setAttribute is also used
+ elem.value = value;
+ }
+ }
+ },
+
+ propFix: {
+ tabindex: "tabIndex",
+ readonly: "readOnly",
+ "for": "htmlFor",
+ "class": "className",
+ maxlength: "maxLength",
+ cellspacing: "cellSpacing",
+ cellpadding: "cellPadding",
+ rowspan: "rowSpan",
+ colspan: "colSpan",
+ usemap: "useMap",
+ frameborder: "frameBorder",
+ contenteditable: "contentEditable"
+ },
+
+ prop: function( elem, name, value ) {
+ var ret, hooks, notxml,
+ nType = elem.nodeType;
+
+ // don't get/set properties on text, comment and attribute nodes
+ if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
+ return;
+ }
+
+ notxml = nType !== 1 || !jQuery.isXMLDoc( elem );
+
+ if ( notxml ) {
+ // Fix name and attach hooks
+ name = jQuery.propFix[ name ] || name;
+ hooks = jQuery.propHooks[ name ];
+ }
+
+ if ( value !== undefined ) {
+ if ( hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ) {
+ return ret;
+
+ } else {
+ return ( elem[ name ] = value );
+ }
+
+ } else {
+ if ( hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ) {
+ return ret;
+
+ } else {
+ return elem[ name ];
+ }
+ }
+ },
+
+ propHooks: {
+ tabIndex: {
+ get: function( elem ) {
+ // elem.tabIndex doesn't always return the correct value when it hasn't been explicitly set
+ // http://fluidproject.org/blog/2008/01/09/getting-setting-and-removing-tabindex-values-with-javascript/
+ var attributeNode = elem.getAttributeNode("tabindex");
+
+ return attributeNode && attributeNode.specified ?
+ parseInt( attributeNode.value, 10 ) :
+ rfocusable.test( elem.nodeName ) || rclickable.test( elem.nodeName ) && elem.href ?
+ 0 :
+ undefined;
+ }
+ }
+ }
+});
+
+// Add the tabIndex propHook to attrHooks for back-compat (different case is intentional)
+jQuery.attrHooks.tabindex = jQuery.propHooks.tabIndex;
+
+// Hook for boolean attributes
+boolHook = {
+ get: function( elem, name ) {
+ // Align boolean attributes with corresponding properties
+ // Fall back to attribute presence where some booleans are not supported
+ var attrNode,
+ property = jQuery.prop( elem, name );
+ return property === true || typeof property !== "boolean" && ( attrNode = elem.getAttributeNode(name) ) && attrNode.nodeValue !== false ?
+ name.toLowerCase() :
+ undefined;
+ },
+ set: function( elem, value, name ) {
+ var propName;
+ if ( value === false ) {
+ // Remove boolean attributes when set to false
+ jQuery.removeAttr( elem, name );
+ } else {
+ // value is true since we know at this point it's type boolean and not false
+ // Set boolean attributes to the same name and set the DOM property
+ propName = jQuery.propFix[ name ] || name;
+ if ( propName in elem ) {
+ // Only set the IDL specifically if it already exists on the element
+ elem[ propName ] = true;
+ }
+
+ elem.setAttribute( name, name.toLowerCase() );
+ }
+ return name;
+ }
+};
+
+// IE6/7 do not support getting/setting some attributes with get/setAttribute
+if ( !getSetAttribute ) {
+
+ fixSpecified = {
+ name: true,
+ id: true,
+ coords: true
+ };
+
+ // Use this for any attribute in IE6/7
+ // This fixes almost every IE6/7 issue
+ nodeHook = jQuery.valHooks.button = {
+ get: function( elem, name ) {
+ var ret;
+ ret = elem.getAttributeNode( name );
+ return ret && ( fixSpecified[ name ] ? ret.nodeValue !== "" : ret.specified ) ?
+ ret.nodeValue :
+ undefined;
+ },
+ set: function( elem, value, name ) {
+ // Set the existing or create a new attribute node
+ var ret = elem.getAttributeNode( name );
+ if ( !ret ) {
+ ret = document.createAttribute( name );
+ elem.setAttributeNode( ret );
+ }
+ return ( ret.nodeValue = value + "" );
+ }
+ };
+
+ // Apply the nodeHook to tabindex
+ jQuery.attrHooks.tabindex.set = nodeHook.set;
+
+ // Set width and height to auto instead of 0 on empty string( Bug #8150 )
+ // This is for removals
+ jQuery.each([ "width", "height" ], function( i, name ) {
+ jQuery.attrHooks[ name ] = jQuery.extend( jQuery.attrHooks[ name ], {
+ set: function( elem, value ) {
+ if ( value === "" ) {
+ elem.setAttribute( name, "auto" );
+ return value;
+ }
+ }
+ });
+ });
+
+ // Set contenteditable to false on removals(#10429)
+ // Setting to empty string throws an error as an invalid value
+ jQuery.attrHooks.contenteditable = {
+ get: nodeHook.get,
+ set: function( elem, value, name ) {
+ if ( value === "" ) {
+ value = "false";
+ }
+ nodeHook.set( elem, value, name );
+ }
+ };
+}
+
+
+// Some attributes require a special call on IE
+if ( !jQuery.support.hrefNormalized ) {
+ jQuery.each([ "href", "src", "width", "height" ], function( i, name ) {
+ jQuery.attrHooks[ name ] = jQuery.extend( jQuery.attrHooks[ name ], {
+ get: function( elem ) {
+ var ret = elem.getAttribute( name, 2 );
+ return ret === null ? undefined : ret;
+ }
+ });
+ });
+}
+
+if ( !jQuery.support.style ) {
+ jQuery.attrHooks.style = {
+ get: function( elem ) {
+ // Return undefined in the case of empty string
+ // Normalize to lowercase since IE uppercases css property names
+ return elem.style.cssText.toLowerCase() || undefined;
+ },
+ set: function( elem, value ) {
+ return ( elem.style.cssText = "" + value );
+ }
+ };
+}
+
+// Safari mis-reports the default selected property of an option
+// Accessing the parent's selectedIndex property fixes it
+if ( !jQuery.support.optSelected ) {
+ jQuery.propHooks.selected = jQuery.extend( jQuery.propHooks.selected, {
+ get: function( elem ) {
+ var parent = elem.parentNode;
+
+ if ( parent ) {
+ parent.selectedIndex;
+
+ // Make sure that it also works with optgroups, see #5701
+ if ( parent.parentNode ) {
+ parent.parentNode.selectedIndex;
+ }
+ }
+ return null;
+ }
+ });
+}
+
+// IE6/7 call enctype encoding
+if ( !jQuery.support.enctype ) {
+ jQuery.propFix.enctype = "encoding";
+}
+
+// Radios and checkboxes getter/setter
+if ( !jQuery.support.checkOn ) {
+ jQuery.each([ "radio", "checkbox" ], function() {
+ jQuery.valHooks[ this ] = {
+ get: function( elem ) {
+ // Handle the case where in Webkit "" is returned instead of "on" if a value isn't specified
+ return elem.getAttribute("value") === null ? "on" : elem.value;
+ }
+ };
+ });
+}
+jQuery.each([ "radio", "checkbox" ], function() {
+ jQuery.valHooks[ this ] = jQuery.extend( jQuery.valHooks[ this ], {
+ set: function( elem, value ) {
+ if ( jQuery.isArray( value ) ) {
+ return ( elem.checked = jQuery.inArray( jQuery(elem).val(), value ) >= 0 );
+ }
+ }
+ });
+});
+
+
+
+
+var rformElems = /^(?:textarea|input|select)$/i,
+ rtypenamespace = /^([^\.]*)?(?:\.(.+))?$/,
+ rhoverHack = /(?:^|\s)hover(\.\S+)?\b/,
+ rkeyEvent = /^key/,
+ rmouseEvent = /^(?:mouse|contextmenu)|click/,
+ rfocusMorph = /^(?:focusinfocus|focusoutblur)$/,
+ rquickIs = /^(\w*)(?:#([\w\-]+))?(?:\.([\w\-]+))?$/,
+ quickParse = function( selector ) {
+ var quick = rquickIs.exec( selector );
+ if ( quick ) {
+ // 0 1 2 3
+ // [ _, tag, id, class ]
+ quick[1] = ( quick[1] || "" ).toLowerCase();
+ quick[3] = quick[3] && new RegExp( "(?:^|\\s)" + quick[3] + "(?:\\s|$)" );
+ }
+ return quick;
+ },
+ quickIs = function( elem, m ) {
+ var attrs = elem.attributes || {};
+ return (
+ (!m[1] || elem.nodeName.toLowerCase() === m[1]) &&
+ (!m[2] || (attrs.id || {}).value === m[2]) &&
+ (!m[3] || m[3].test( (attrs[ "class" ] || {}).value ))
+ );
+ },
+ hoverHack = function( events ) {
+ return jQuery.event.special.hover ? events : events.replace( rhoverHack, "mouseenter$1 mouseleave$1" );
+ };
+
+/*
+ * Helper functions for managing events -- not part of the public interface.
+ * Props to Dean Edwards' addEvent library for many of the ideas.
+ */
+jQuery.event = {
+
+ add: function( elem, types, handler, data, selector ) {
+
+ var elemData, eventHandle, events,
+ t, tns, type, namespaces, handleObj,
+ handleObjIn, quick, handlers, special;
+
+ // Don't attach events to noData or text/comment nodes (allow plain objects tho)
+ if ( elem.nodeType === 3 || elem.nodeType === 8 || !types || !handler || !(elemData = jQuery._data( elem )) ) {
+ return;
+ }
+
+ // Caller can pass in an object of custom data in lieu of the handler
+ if ( handler.handler ) {
+ handleObjIn = handler;
+ handler = handleObjIn.handler;
+ selector = handleObjIn.selector;
+ }
+
+ // Make sure that the handler has a unique ID, used to find/remove it later
+ if ( !handler.guid ) {
+ handler.guid = jQuery.guid++;
+ }
+
+ // Init the element's event structure and main handler, if this is the first
+ events = elemData.events;
+ if ( !events ) {
+ elemData.events = events = {};
+ }
+ eventHandle = elemData.handle;
+ if ( !eventHandle ) {
+ elemData.handle = eventHandle = function( e ) {
+ // Discard the second event of a jQuery.event.trigger() and
+ // when an event is called after a page has unloaded
+ return typeof jQuery !== "undefined" && (!e || jQuery.event.triggered !== e.type) ?
+ jQuery.event.dispatch.apply( eventHandle.elem, arguments ) :
+ undefined;
+ };
+ // Add elem as a property of the handle fn to prevent a memory leak with IE non-native events
+ eventHandle.elem = elem;
+ }
+
+ // Handle multiple events separated by a space
+ // jQuery(...).bind("mouseover mouseout", fn);
+ types = jQuery.trim( hoverHack(types) ).split( " " );
+ for ( t = 0; t < types.length; t++ ) {
+
+ tns = rtypenamespace.exec( types[t] ) || [];
+ type = tns[1];
+ namespaces = ( tns[2] || "" ).split( "." ).sort();
+
+ // If event changes its type, use the special event handlers for the changed type
+ special = jQuery.event.special[ type ] || {};
+
+ // If selector defined, determine special event api type, otherwise given type
+ type = ( selector ? special.delegateType : special.bindType ) || type;
+
+ // Update special based on newly reset type
+ special = jQuery.event.special[ type ] || {};
+
+ // handleObj is passed to all event handlers
+ handleObj = jQuery.extend({
+ type: type,
+ origType: tns[1],
+ data: data,
+ handler: handler,
+ guid: handler.guid,
+ selector: selector,
+ quick: selector && quickParse( selector ),
+ namespace: namespaces.join(".")
+ }, handleObjIn );
+
+ // Init the event handler queue if we're the first
+ handlers = events[ type ];
+ if ( !handlers ) {
+ handlers = events[ type ] = [];
+ handlers.delegateCount = 0;
+
+ // Only use addEventListener/attachEvent if the special events handler returns false
+ if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {
+ // Bind the global event handler to the element
+ if ( elem.addEventListener ) {
+ elem.addEventListener( type, eventHandle, false );
+
+ } else if ( elem.attachEvent ) {
+ elem.attachEvent( "on" + type, eventHandle );
+ }
+ }
+ }
+
+ if ( special.add ) {
+ special.add.call( elem, handleObj );
+
+ if ( !handleObj.handler.guid ) {
+ handleObj.handler.guid = handler.guid;
+ }
+ }
+
+ // Add to the element's handler list, delegates in front
+ if ( selector ) {
+ handlers.splice( handlers.delegateCount++, 0, handleObj );
+ } else {
+ handlers.push( handleObj );
+ }
+
+ // Keep track of which events have ever been used, for event optimization
+ jQuery.event.global[ type ] = true;
+ }
+
+ // Nullify elem to prevent memory leaks in IE
+ elem = null;
+ },
+
+ global: {},
+
+ // Detach an event or set of events from an element
+ remove: function( elem, types, handler, selector, mappedTypes ) {
+
+ var elemData = jQuery.hasData( elem ) && jQuery._data( elem ),
+ t, tns, type, origType, namespaces, origCount,
+ j, events, special, handle, eventType, handleObj;
+
+ if ( !elemData || !(events = elemData.events) ) {
+ return;
+ }
+
+ // Once for each type.namespace in types; type may be omitted
+ types = jQuery.trim( hoverHack( types || "" ) ).split(" ");
+ for ( t = 0; t < types.length; t++ ) {
+ tns = rtypenamespace.exec( types[t] ) || [];
+ type = origType = tns[1];
+ namespaces = tns[2];
+
+ // Unbind all events (on this namespace, if provided) for the element
+ if ( !type ) {
+ for ( type in events ) {
+ jQuery.event.remove( elem, type + types[ t ], handler, selector, true );
+ }
+ continue;
+ }
+
+ special = jQuery.event.special[ type ] || {};
+ type = ( selector? special.delegateType : special.bindType ) || type;
+ eventType = events[ type ] || [];
+ origCount = eventType.length;
+ namespaces = namespaces ? new RegExp("(^|\\.)" + namespaces.split(".").sort().join("\\.(?:.*\\.)?") + "(\\.|$)") : null;
+
+ // Remove matching events
+ for ( j = 0; j < eventType.length; j++ ) {
+ handleObj = eventType[ j ];
+
+ if ( ( mappedTypes || origType === handleObj.origType ) &&
+ ( !handler || handler.guid === handleObj.guid ) &&
+ ( !namespaces || namespaces.test( handleObj.namespace ) ) &&
+ ( !selector || selector === handleObj.selector || selector === "**" && handleObj.selector ) ) {
+ eventType.splice( j--, 1 );
+
+ if ( handleObj.selector ) {
+ eventType.delegateCount--;
+ }
+ if ( special.remove ) {
+ special.remove.call( elem, handleObj );
+ }
+ }
+ }
+
+ // Remove generic event handler if we removed something and no more handlers exist
+ // (avoids potential for endless recursion during removal of special event handlers)
+ if ( eventType.length === 0 && origCount !== eventType.length ) {
+ if ( !special.teardown || special.teardown.call( elem, namespaces ) === false ) {
+ jQuery.removeEvent( elem, type, elemData.handle );
+ }
+
+ delete events[ type ];
+ }
+ }
+
+ // Remove the expando if it's no longer used
+ if ( jQuery.isEmptyObject( events ) ) {
+ handle = elemData.handle;
+ if ( handle ) {
+ handle.elem = null;
+ }
+
+ // removeData also checks for emptiness and clears the expando if empty
+ // so use it instead of delete
+ jQuery.removeData( elem, [ "events", "handle" ], true );
+ }
+ },
+
+ // Events that are safe to short-circuit if no handlers are attached.
+ // Native DOM events should not be added, they may have inline handlers.
+ customEvent: {
+ "getData": true,
+ "setData": true,
+ "changeData": true
+ },
+
+ trigger: function( event, data, elem, onlyHandlers ) {
+ // Don't do events on text and comment nodes
+ if ( elem && (elem.nodeType === 3 || elem.nodeType === 8) ) {
+ return;
+ }
+
+ // Event object or event type
+ var type = event.type || event,
+ namespaces = [],
+ cache, exclusive, i, cur, old, ontype, special, handle, eventPath, bubbleType;
+
+ // focus/blur morphs to focusin/out; ensure we're not firing them right now
+ if ( rfocusMorph.test( type + jQuery.event.triggered ) ) {
+ return;
+ }
+
+ if ( type.indexOf( "!" ) >= 0 ) {
+ // Exclusive events trigger only for the exact event (no namespaces)
+ type = type.slice(0, -1);
+ exclusive = true;
+ }
+
+ if ( type.indexOf( "." ) >= 0 ) {
+ // Namespaced trigger; create a regexp to match event type in handle()
+ namespaces = type.split(".");
+ type = namespaces.shift();
+ namespaces.sort();
+ }
+
+ if ( (!elem || jQuery.event.customEvent[ type ]) && !jQuery.event.global[ type ] ) {
+ // No jQuery handlers for this event type, and it can't have inline handlers
+ return;
+ }
+
+ // Caller can pass in an Event, Object, or just an event type string
+ event = typeof event === "object" ?
+ // jQuery.Event object
+ event[ jQuery.expando ] ? event :
+ // Object literal
+ new jQuery.Event( type, event ) :
+ // Just the event type (string)
+ new jQuery.Event( type );
+
+ event.type = type;
+ event.isTrigger = true;
+ event.exclusive = exclusive;
+ event.namespace = namespaces.join( "." );
+ event.namespace_re = event.namespace? new RegExp("(^|\\.)" + namespaces.join("\\.(?:.*\\.)?") + "(\\.|$)") : null;
+ ontype = type.indexOf( ":" ) < 0 ? "on" + type : "";
+
+ // Handle a global trigger
+ if ( !elem ) {
+
+ // TODO: Stop taunting the data cache; remove global events and always attach to document
+ cache = jQuery.cache;
+ for ( i in cache ) {
+ if ( cache[ i ].events && cache[ i ].events[ type ] ) {
+ jQuery.event.trigger( event, data, cache[ i ].handle.elem, true );
+ }
+ }
+ return;
+ }
+
+ // Clean up the event in case it is being reused
+ event.result = undefined;
+ if ( !event.target ) {
+ event.target = elem;
+ }
+
+ // Clone any incoming data and prepend the event, creating the handler arg list
+ data = data != null ? jQuery.makeArray( data ) : [];
+ data.unshift( event );
+
+ // Allow special events to draw outside the lines
+ special = jQuery.event.special[ type ] || {};
+ if ( special.trigger && special.trigger.apply( elem, data ) === false ) {
+ return;
+ }
+
+ // Determine event propagation path in advance, per W3C events spec (#9951)
+ // Bubble up to document, then to window; watch for a global ownerDocument var (#9724)
+ eventPath = [[ elem, special.bindType || type ]];
+ if ( !onlyHandlers && !special.noBubble && !jQuery.isWindow( elem ) ) {
+
+ bubbleType = special.delegateType || type;
+ cur = rfocusMorph.test( bubbleType + type ) ? elem : elem.parentNode;
+ old = null;
+ for ( ; cur; cur = cur.parentNode ) {
+ eventPath.push([ cur, bubbleType ]);
+ old = cur;
+ }
+
+ // Only add window if we got to document (e.g., not plain obj or detached DOM)
+ if ( old && old === elem.ownerDocument ) {
+ eventPath.push([ old.defaultView || old.parentWindow || window, bubbleType ]);
+ }
+ }
+
+ // Fire handlers on the event path
+ for ( i = 0; i < eventPath.length && !event.isPropagationStopped(); i++ ) {
+
+ cur = eventPath[i][0];
+ event.type = eventPath[i][1];
+
+ handle = ( jQuery._data( cur, "events" ) || {} )[ event.type ] && jQuery._data( cur, "handle" );
+ if ( handle ) {
+ handle.apply( cur, data );
+ }
+ // Note that this is a bare JS function and not a jQuery handler
+ handle = ontype && cur[ ontype ];
+ if ( handle && jQuery.acceptData( cur ) && handle.apply( cur, data ) === false ) {
+ event.preventDefault();
+ }
+ }
+ event.type = type;
+
+ // If nobody prevented the default action, do it now
+ if ( !onlyHandlers && !event.isDefaultPrevented() ) {
+
+ if ( (!special._default || special._default.apply( elem.ownerDocument, data ) === false) &&
+ !(type === "click" && jQuery.nodeName( elem, "a" )) && jQuery.acceptData( elem ) ) {
+
+ // Call a native DOM method on the target with the same name name as the event.
+ // Can't use an .isFunction() check here because IE6/7 fails that test.
+ // Don't do default actions on window, that's where global variables be (#6170)
+ // IE<9 dies on focus/blur to hidden element (#1486)
+ if ( ontype && elem[ type ] && ((type !== "focus" && type !== "blur") || event.target.offsetWidth !== 0) && !jQuery.isWindow( elem ) ) {
+
+ // Don't re-trigger an onFOO event when we call its FOO() method
+ old = elem[ ontype ];
+
+ if ( old ) {
+ elem[ ontype ] = null;
+ }
+
+ // Prevent re-triggering of the same event, since we already bubbled it above
+ jQuery.event.triggered = type;
+ elem[ type ]();
+ jQuery.event.triggered = undefined;
+
+ if ( old ) {
+ elem[ ontype ] = old;
+ }
+ }
+ }
+ }
+
+ return event.result;
+ },
+
+ dispatch: function( event ) {
+
+ // Make a writable jQuery.Event from the native event object
+ event = jQuery.event.fix( event || window.event );
+
+ var handlers = ( (jQuery._data( this, "events" ) || {} )[ event.type ] || []),
+ delegateCount = handlers.delegateCount,
+ args = [].slice.call( arguments, 0 ),
+ run_all = !event.exclusive && !event.namespace,
+ special = jQuery.event.special[ event.type ] || {},
+ handlerQueue = [],
+ i, j, cur, jqcur, ret, selMatch, matched, matches, handleObj, sel, related;
+
+ // Use the fix-ed jQuery.Event rather than the (read-only) native event
+ args[0] = event;
+ event.delegateTarget = this;
+
+ // Call the preDispatch hook for the mapped type, and let it bail if desired
+ if ( special.preDispatch && special.preDispatch.call( this, event ) === false ) {
+ return;
+ }
+
+ // Determine handlers that should run if there are delegated events
+ // Avoid non-left-click bubbling in Firefox (#3861)
+ if ( delegateCount && !(event.button && event.type === "click") ) {
+
+ // Pregenerate a single jQuery object for reuse with .is()
+ jqcur = jQuery(this);
+ jqcur.context = this.ownerDocument || this;
+
+ for ( cur = event.target; cur != this; cur = cur.parentNode || this ) {
+
+ // Don't process events on disabled elements (#6911, #8165)
+ if ( cur.disabled !== true ) {
+ selMatch = {};
+ matches = [];
+ jqcur[0] = cur;
+ for ( i = 0; i < delegateCount; i++ ) {
+ handleObj = handlers[ i ];
+ sel = handleObj.selector;
+
+ if ( selMatch[ sel ] === undefined ) {
+ selMatch[ sel ] = (
+ handleObj.quick ? quickIs( cur, handleObj.quick ) : jqcur.is( sel )
+ );
+ }
+ if ( selMatch[ sel ] ) {
+ matches.push( handleObj );
+ }
+ }
+ if ( matches.length ) {
+ handlerQueue.push({ elem: cur, matches: matches });
+ }
+ }
+ }
+ }
+
+ // Add the remaining (directly-bound) handlers
+ if ( handlers.length > delegateCount ) {
+ handlerQueue.push({ elem: this, matches: handlers.slice( delegateCount ) });
+ }
+
+ // Run delegates first; they may want to stop propagation beneath us
+ for ( i = 0; i < handlerQueue.length && !event.isPropagationStopped(); i++ ) {
+ matched = handlerQueue[ i ];
+ event.currentTarget = matched.elem;
+
+ for ( j = 0; j < matched.matches.length && !event.isImmediatePropagationStopped(); j++ ) {
+ handleObj = matched.matches[ j ];
+
+ // Triggered event must either 1) be non-exclusive and have no namespace, or
+ // 2) have namespace(s) a subset or equal to those in the bound event (both can have no namespace).
+ if ( run_all || (!event.namespace && !handleObj.namespace) || event.namespace_re && event.namespace_re.test( handleObj.namespace ) ) {
+
+ event.data = handleObj.data;
+ event.handleObj = handleObj;
+
+ ret = ( (jQuery.event.special[ handleObj.origType ] || {}).handle || handleObj.handler )
+ .apply( matched.elem, args );
+
+ if ( ret !== undefined ) {
+ event.result = ret;
+ if ( ret === false ) {
+ event.preventDefault();
+ event.stopPropagation();
+ }
+ }
+ }
+ }
+ }
+
+ // Call the postDispatch hook for the mapped type
+ if ( special.postDispatch ) {
+ special.postDispatch.call( this, event );
+ }
+
+ return event.result;
+ },
+
+ // Includes some event props shared by KeyEvent and MouseEvent
+ // *** attrChange attrName relatedNode srcElement are not normalized, non-W3C, deprecated, will be removed in 1.8 ***
+ props: "attrChange attrName relatedNode srcElement altKey bubbles cancelable ctrlKey currentTarget eventPhase metaKey relatedTarget shiftKey target timeStamp view which".split(" "),
+
+ fixHooks: {},
+
+ keyHooks: {
+ props: "char charCode key keyCode".split(" "),
+ filter: function( event, original ) {
+
+ // Add which for key events
+ if ( event.which == null ) {
+ event.which = original.charCode != null ? original.charCode : original.keyCode;
+ }
+
+ return event;
+ }
+ },
+
+ mouseHooks: {
+ props: "button buttons clientX clientY fromElement offsetX offsetY pageX pageY screenX screenY toElement".split(" "),
+ filter: function( event, original ) {
+ var eventDoc, doc, body,
+ button = original.button,
+ fromElement = original.fromElement;
+
+ // Calculate pageX/Y if missing and clientX/Y available
+ if ( event.pageX == null && original.clientX != null ) {
+ eventDoc = event.target.ownerDocument || document;
+ doc = eventDoc.documentElement;
+ body = eventDoc.body;
+
+ event.pageX = original.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && body.clientLeft || 0 );
+ event.pageY = original.clientY + ( doc && doc.scrollTop || body && body.scrollTop || 0 ) - ( doc && doc.clientTop || body && body.clientTop || 0 );
+ }
+
+ // Add relatedTarget, if necessary
+ if ( !event.relatedTarget && fromElement ) {
+ event.relatedTarget = fromElement === event.target ? original.toElement : fromElement;
+ }
+
+ // Add which for click: 1 === left; 2 === middle; 3 === right
+ // Note: button is not normalized, so don't use it
+ if ( !event.which && button !== undefined ) {
+ event.which = ( button & 1 ? 1 : ( button & 2 ? 3 : ( button & 4 ? 2 : 0 ) ) );
+ }
+
+ return event;
+ }
+ },
+
+ fix: function( event ) {
+ if ( event[ jQuery.expando ] ) {
+ return event;
+ }
+
+ // Create a writable copy of the event object and normalize some properties
+ var i, prop,
+ originalEvent = event,
+ fixHook = jQuery.event.fixHooks[ event.type ] || {},
+ copy = fixHook.props ? this.props.concat( fixHook.props ) : this.props;
+
+ event = jQuery.Event( originalEvent );
+
+ for ( i = copy.length; i; ) {
+ prop = copy[ --i ];
+ event[ prop ] = originalEvent[ prop ];
+ }
+
+ // Fix target property, if necessary (#1925, IE 6/7/8 & Safari2)
+ if ( !event.target ) {
+ event.target = originalEvent.srcElement || document;
+ }
+
+ // Target should not be a text node (#504, Safari)
+ if ( event.target.nodeType === 3 ) {
+ event.target = event.target.parentNode;
+ }
+
+ // For mouse/key events; add metaKey if it's not there (#3368, IE6/7/8)
+ if ( event.metaKey === undefined ) {
+ event.metaKey = event.ctrlKey;
+ }
+
+ return fixHook.filter? fixHook.filter( event, originalEvent ) : event;
+ },
+
+ special: {
+ ready: {
+ // Make sure the ready event is setup
+ setup: jQuery.bindReady
+ },
+
+ load: {
+ // Prevent triggered image.load events from bubbling to window.load
+ noBubble: true
+ },
+
+ focus: {
+ delegateType: "focusin"
+ },
+ blur: {
+ delegateType: "focusout"
+ },
+
+ beforeunload: {
+ setup: function( data, namespaces, eventHandle ) {
+ // We only want to do this special case on windows
+ if ( jQuery.isWindow( this ) ) {
+ this.onbeforeunload = eventHandle;
+ }
+ },
+
+ teardown: function( namespaces, eventHandle ) {
+ if ( this.onbeforeunload === eventHandle ) {
+ this.onbeforeunload = null;
+ }
+ }
+ }
+ },
+
+ simulate: function( type, elem, event, bubble ) {
+ // Piggyback on a donor event to simulate a different one.
+ // Fake originalEvent to avoid donor's stopPropagation, but if the
+ // simulated event prevents default then we do the same on the donor.
+ var e = jQuery.extend(
+ new jQuery.Event(),
+ event,
+ { type: type,
+ isSimulated: true,
+ originalEvent: {}
+ }
+ );
+ if ( bubble ) {
+ jQuery.event.trigger( e, null, elem );
+ } else {
+ jQuery.event.dispatch.call( elem, e );
+ }
+ if ( e.isDefaultPrevented() ) {
+ event.preventDefault();
+ }
+ }
+};
+
+// Some plugins are using, but it's undocumented/deprecated and will be removed.
+// The 1.7 special event interface should provide all the hooks needed now.
+jQuery.event.handle = jQuery.event.dispatch;
+
+jQuery.removeEvent = document.removeEventListener ?
+ function( elem, type, handle ) {
+ if ( elem.removeEventListener ) {
+ elem.removeEventListener( type, handle, false );
+ }
+ } :
+ function( elem, type, handle ) {
+ if ( elem.detachEvent ) {
+ elem.detachEvent( "on" + type, handle );
+ }
+ };
+
+jQuery.Event = function( src, props ) {
+ // Allow instantiation without the 'new' keyword
+ if ( !(this instanceof jQuery.Event) ) {
+ return new jQuery.Event( src, props );
+ }
+
+ // Event object
+ if ( src && src.type ) {
+ this.originalEvent = src;
+ this.type = src.type;
+
+ // Events bubbling up the document may have been marked as prevented
+ // by a handler lower down the tree; reflect the correct value.
+ this.isDefaultPrevented = ( src.defaultPrevented || src.returnValue === false ||
+ src.getPreventDefault && src.getPreventDefault() ) ? returnTrue : returnFalse;
+
+ // Event type
+ } else {
+ this.type = src;
+ }
+
+ // Put explicitly provided properties onto the event object
+ if ( props ) {
+ jQuery.extend( this, props );
+ }
+
+ // Create a timestamp if incoming event doesn't have one
+ this.timeStamp = src && src.timeStamp || jQuery.now();
+
+ // Mark it as fixed
+ this[ jQuery.expando ] = true;
+};
+
+function returnFalse() {
+ return false;
+}
+function returnTrue() {
+ return true;
+}
+
+// jQuery.Event is based on DOM3 Events as specified by the ECMAScript Language Binding
+// http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
+jQuery.Event.prototype = {
+ preventDefault: function() {
+ this.isDefaultPrevented = returnTrue;
+
+ var e = this.originalEvent;
+ if ( !e ) {
+ return;
+ }
+
+ // if preventDefault exists run it on the original event
+ if ( e.preventDefault ) {
+ e.preventDefault();
+
+ // otherwise set the returnValue property of the original event to false (IE)
+ } else {
+ e.returnValue = false;
+ }
+ },
+ stopPropagation: function() {
+ this.isPropagationStopped = returnTrue;
+
+ var e = this.originalEvent;
+ if ( !e ) {
+ return;
+ }
+ // if stopPropagation exists run it on the original event
+ if ( e.stopPropagation ) {
+ e.stopPropagation();
+ }
+ // otherwise set the cancelBubble property of the original event to true (IE)
+ e.cancelBubble = true;
+ },
+ stopImmediatePropagation: function() {
+ this.isImmediatePropagationStopped = returnTrue;
+ this.stopPropagation();
+ },
+ isDefaultPrevented: returnFalse,
+ isPropagationStopped: returnFalse,
+ isImmediatePropagationStopped: returnFalse
+};
+
+// Create mouseenter/leave events using mouseover/out and event-time checks
+jQuery.each({
+ mouseenter: "mouseover",
+ mouseleave: "mouseout"
+}, function( orig, fix ) {
+ jQuery.event.special[ orig ] = {
+ delegateType: fix,
+ bindType: fix,
+
+ handle: function( event ) {
+ var target = this,
+ related = event.relatedTarget,
+ handleObj = event.handleObj,
+ selector = handleObj.selector,
+ ret;
+
+ // For mousenter/leave call the handler if related is outside the target.
+ // NB: No relatedTarget if the mouse left/entered the browser window
+ if ( !related || (related !== target && !jQuery.contains( target, related )) ) {
+ event.type = handleObj.origType;
+ ret = handleObj.handler.apply( this, arguments );
+ event.type = fix;
+ }
+ return ret;
+ }
+ };
+});
+
+// IE submit delegation
+if ( !jQuery.support.submitBubbles ) {
+
+ jQuery.event.special.submit = {
+ setup: function() {
+ // Only need this for delegated form submit events
+ if ( jQuery.nodeName( this, "form" ) ) {
+ return false;
+ }
+
+ // Lazy-add a submit handler when a descendant form may potentially be submitted
+ jQuery.event.add( this, "click._submit keypress._submit", function( e ) {
+ // Node name check avoids a VML-related crash in IE (#9807)
+ var elem = e.target,
+ form = jQuery.nodeName( elem, "input" ) || jQuery.nodeName( elem, "button" ) ? elem.form : undefined;
+ if ( form && !form._submit_attached ) {
+ jQuery.event.add( form, "submit._submit", function( event ) {
+ event._submit_bubble = true;
+ });
+ form._submit_attached = true;
+ }
+ });
+ // return undefined since we don't need an event listener
+ },
+
+ postDispatch: function( event ) {
+ // If form was submitted by the user, bubble the event up the tree
+ if ( event._submit_bubble ) {
+ delete event._submit_bubble;
+ if ( this.parentNode && !event.isTrigger ) {
+ jQuery.event.simulate( "submit", this.parentNode, event, true );
+ }
+ }
+ },
+
+ teardown: function() {
+ // Only need this for delegated form submit events
+ if ( jQuery.nodeName( this, "form" ) ) {
+ return false;
+ }
+
+ // Remove delegated handlers; cleanData eventually reaps submit handlers attached above
+ jQuery.event.remove( this, "._submit" );
+ }
+ };
+}
+
+// IE change delegation and checkbox/radio fix
+if ( !jQuery.support.changeBubbles ) {
+
+ jQuery.event.special.change = {
+
+ setup: function() {
+
+ if ( rformElems.test( this.nodeName ) ) {
+ // IE doesn't fire change on a check/radio until blur; trigger it on click
+ // after a propertychange. Eat the blur-change in special.change.handle.
+ // This still fires onchange a second time for check/radio after blur.
+ if ( this.type === "checkbox" || this.type === "radio" ) {
+ jQuery.event.add( this, "propertychange._change", function( event ) {
+ if ( event.originalEvent.propertyName === "checked" ) {
+ this._just_changed = true;
+ }
+ });
+ jQuery.event.add( this, "click._change", function( event ) {
+ if ( this._just_changed && !event.isTrigger ) {
+ this._just_changed = false;
+ jQuery.event.simulate( "change", this, event, true );
+ }
+ });
+ }
+ return false;
+ }
+ // Delegated event; lazy-add a change handler on descendant inputs
+ jQuery.event.add( this, "beforeactivate._change", function( e ) {
+ var elem = e.target;
+
+ if ( rformElems.test( elem.nodeName ) && !elem._change_attached ) {
+ jQuery.event.add( elem, "change._change", function( event ) {
+ if ( this.parentNode && !event.isSimulated && !event.isTrigger ) {
+ jQuery.event.simulate( "change", this.parentNode, event, true );
+ }
+ });
+ elem._change_attached = true;
+ }
+ });
+ },
+
+ handle: function( event ) {
+ var elem = event.target;
+
+ // Swallow native change events from checkbox/radio, we already triggered them above
+ if ( this !== elem || event.isSimulated || event.isTrigger || (elem.type !== "radio" && elem.type !== "checkbox") ) {
+ return event.handleObj.handler.apply( this, arguments );
+ }
+ },
+
+ teardown: function() {
+ jQuery.event.remove( this, "._change" );
+
+ return rformElems.test( this.nodeName );
+ }
+ };
+}
+
+// Create "bubbling" focus and blur events
+if ( !jQuery.support.focusinBubbles ) {
+ jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {
+
+ // Attach a single capturing handler while someone wants focusin/focusout
+ var attaches = 0,
+ handler = function( event ) {
+ jQuery.event.simulate( fix, event.target, jQuery.event.fix( event ), true );
+ };
+
+ jQuery.event.special[ fix ] = {
+ setup: function() {
+ if ( attaches++ === 0 ) {
+ document.addEventListener( orig, handler, true );
+ }
+ },
+ teardown: function() {
+ if ( --attaches === 0 ) {
+ document.removeEventListener( orig, handler, true );
+ }
+ }
+ };
+ });
+}
+
+jQuery.fn.extend({
+
+ on: function( types, selector, data, fn, /*INTERNAL*/ one ) {
+ var origFn, type;
+
+ // Types can be a map of types/handlers
+ if ( typeof types === "object" ) {
+ // ( types-Object, selector, data )
+ if ( typeof selector !== "string" ) { // && selector != null
+ // ( types-Object, data )
+ data = data || selector;
+ selector = undefined;
+ }
+ for ( type in types ) {
+ this.on( type, selector, data, types[ type ], one );
+ }
+ return this;
+ }
+
+ if ( data == null && fn == null ) {
+ // ( types, fn )
+ fn = selector;
+ data = selector = undefined;
+ } else if ( fn == null ) {
+ if ( typeof selector === "string" ) {
+ // ( types, selector, fn )
+ fn = data;
+ data = undefined;
+ } else {
+ // ( types, data, fn )
+ fn = data;
+ data = selector;
+ selector = undefined;
+ }
+ }
+ if ( fn === false ) {
+ fn = returnFalse;
+ } else if ( !fn ) {
+ return this;
+ }
+
+ if ( one === 1 ) {
+ origFn = fn;
+ fn = function( event ) {
+ // Can use an empty set, since event contains the info
+ jQuery().off( event );
+ return origFn.apply( this, arguments );
+ };
+ // Use same guid so caller can remove using origFn
+ fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
+ }
+ return this.each( function() {
+ jQuery.event.add( this, types, fn, data, selector );
+ });
+ },
+ one: function( types, selector, data, fn ) {
+ return this.on( types, selector, data, fn, 1 );
+ },
+ off: function( types, selector, fn ) {
+ if ( types && types.preventDefault && types.handleObj ) {
+ // ( event ) dispatched jQuery.Event
+ var handleObj = types.handleObj;
+ jQuery( types.delegateTarget ).off(
+ handleObj.namespace ? handleObj.origType + "." + handleObj.namespace : handleObj.origType,
+ handleObj.selector,
+ handleObj.handler
+ );
+ return this;
+ }
+ if ( typeof types === "object" ) {
+ // ( types-object [, selector] )
+ for ( var type in types ) {
+ this.off( type, selector, types[ type ] );
+ }
+ return this;
+ }
+ if ( selector === false || typeof selector === "function" ) {
+ // ( types [, fn] )
+ fn = selector;
+ selector = undefined;
+ }
+ if ( fn === false ) {
+ fn = returnFalse;
+ }
+ return this.each(function() {
+ jQuery.event.remove( this, types, fn, selector );
+ });
+ },
+
+ bind: function( types, data, fn ) {
+ return this.on( types, null, data, fn );
+ },
+ unbind: function( types, fn ) {
+ return this.off( types, null, fn );
+ },
+
+ live: function( types, data, fn ) {
+ jQuery( this.context ).on( types, this.selector, data, fn );
+ return this;
+ },
+ die: function( types, fn ) {
+ jQuery( this.context ).off( types, this.selector || "**", fn );
+ return this;
+ },
+
+ delegate: function( selector, types, data, fn ) {
+ return this.on( types, selector, data, fn );
+ },
+ undelegate: function( selector, types, fn ) {
+ // ( namespace ) or ( selector, types [, fn] )
+ return arguments.length == 1? this.off( selector, "**" ) : this.off( types, selector, fn );
+ },
+
+ trigger: function( type, data ) {
+ return this.each(function() {
+ jQuery.event.trigger( type, data, this );
+ });
+ },
+ triggerHandler: function( type, data ) {
+ if ( this[0] ) {
+ return jQuery.event.trigger( type, data, this[0], true );
+ }
+ },
+
+ toggle: function( fn ) {
+ // Save reference to arguments for access in closure
+ var args = arguments,
+ guid = fn.guid || jQuery.guid++,
+ i = 0,
+ toggler = function( event ) {
+ // Figure out which function to execute
+ var lastToggle = ( jQuery._data( this, "lastToggle" + fn.guid ) || 0 ) % i;
+ jQuery._data( this, "lastToggle" + fn.guid, lastToggle + 1 );
+
+ // Make sure that clicks stop
+ event.preventDefault();
+
+ // and execute the function
+ return args[ lastToggle ].apply( this, arguments ) || false;
+ };
+
+ // link all the functions, so any of them can unbind this click handler
+ toggler.guid = guid;
+ while ( i < args.length ) {
+ args[ i++ ].guid = guid;
+ }
+
+ return this.click( toggler );
+ },
+
+ hover: function( fnOver, fnOut ) {
+ return this.mouseenter( fnOver ).mouseleave( fnOut || fnOver );
+ }
+});
+
+jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblclick " +
+ "mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
+ "change select submit keydown keypress keyup error contextmenu").split(" "), function( i, name ) {
+
+ // Handle event binding
+ jQuery.fn[ name ] = function( data, fn ) {
+ if ( fn == null ) {
+ fn = data;
+ data = null;
+ }
+
+ return arguments.length > 0 ?
+ this.on( name, null, data, fn ) :
+ this.trigger( name );
+ };
+
+ if ( jQuery.attrFn ) {
+ jQuery.attrFn[ name ] = true;
+ }
+
+ if ( rkeyEvent.test( name ) ) {
+ jQuery.event.fixHooks[ name ] = jQuery.event.keyHooks;
+ }
+
+ if ( rmouseEvent.test( name ) ) {
+ jQuery.event.fixHooks[ name ] = jQuery.event.mouseHooks;
+ }
+});
+
+
+
+/*!
+ * Sizzle CSS Selector Engine
+ * Copyright 2011, The Dojo Foundation
+ * Released under the MIT, BSD, and GPL Licenses.
+ * More information: http://sizzlejs.com/
+ */
+(function(){
+
+var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^\[\]]*\]|['"][^'"]*['"]|[^\[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,
+ expando = "sizcache" + (Math.random() + '').replace('.', ''),
+ done = 0,
+ toString = Object.prototype.toString,
+ hasDuplicate = false,
+ baseHasDuplicate = true,
+ rBackslash = /\\/g,
+ rReturn = /\r\n/g,
+ rNonWord = /\W/;
+
+// Here we check if the JavaScript engine is using some sort of
+// optimization where it does not always call our comparision
+// function. If that is the case, discard the hasDuplicate value.
+// Thus far that includes Google Chrome.
+[0, 0].sort(function() {
+ baseHasDuplicate = false;
+ return 0;
+});
+
+var Sizzle = function( selector, context, results, seed ) {
+ results = results || [];
+ context = context || document;
+
+ var origContext = context;
+
+ if ( context.nodeType !== 1 && context.nodeType !== 9 ) {
+ return [];
+ }
+
+ if ( !selector || typeof selector !== "string" ) {
+ return results;
+ }
+
+ var m, set, checkSet, extra, ret, cur, pop, i,
+ prune = true,
+ contextXML = Sizzle.isXML( context ),
+ parts = [],
+ soFar = selector;
+
+ // Reset the position of the chunker regexp (start from head)
+ do {
+ chunker.exec( "" );
+ m = chunker.exec( soFar );
+
+ if ( m ) {
+ soFar = m[3];
+
+ parts.push( m[1] );
+
+ if ( m[2] ) {
+ extra = m[3];
+ break;
+ }
+ }
+ } while ( m );
+
+ if ( parts.length > 1 && origPOS.exec( selector ) ) {
+
+ if ( parts.length === 2 && Expr.relative[ parts[0] ] ) {
+ set = posProcess( parts[0] + parts[1], context, seed );
+
+ } else {
+ set = Expr.relative[ parts[0] ] ?
+ [ context ] :
+ Sizzle( parts.shift(), context );
+
+ while ( parts.length ) {
+ selector = parts.shift();
+
+ if ( Expr.relative[ selector ] ) {
+ selector += parts.shift();
+ }
+
+ set = posProcess( selector, set, seed );
+ }
+ }
+
+ } else {
+ // Take a shortcut and set the context if the root selector is an ID
+ // (but not if it'll be faster if the inner selector is an ID)
+ if ( !seed && parts.length > 1 && context.nodeType === 9 && !contextXML &&
+ Expr.match.ID.test(parts[0]) && !Expr.match.ID.test(parts[parts.length - 1]) ) {
+
+ ret = Sizzle.find( parts.shift(), context, contextXML );
+ context = ret.expr ?
+ Sizzle.filter( ret.expr, ret.set )[0] :
+ ret.set[0];
+ }
+
+ if ( context ) {
+ ret = seed ?
+ { expr: parts.pop(), set: makeArray(seed) } :
+ Sizzle.find( parts.pop(), parts.length === 1 && (parts[0] === "~" || parts[0] === "+") && context.parentNode ? context.parentNode : context, contextXML );
+
+ set = ret.expr ?
+ Sizzle.filter( ret.expr, ret.set ) :
+ ret.set;
+
+ if ( parts.length > 0 ) {
+ checkSet = makeArray( set );
+
+ } else {
+ prune = false;
+ }
+
+ while ( parts.length ) {
+ cur = parts.pop();
+ pop = cur;
+
+ if ( !Expr.relative[ cur ] ) {
+ cur = "";
+ } else {
+ pop = parts.pop();
+ }
+
+ if ( pop == null ) {
+ pop = context;
+ }
+
+ Expr.relative[ cur ]( checkSet, pop, contextXML );
+ }
+
+ } else {
+ checkSet = parts = [];
+ }
+ }
+
+ if ( !checkSet ) {
+ checkSet = set;
+ }
+
+ if ( !checkSet ) {
+ Sizzle.error( cur || selector );
+ }
+
+ if ( toString.call(checkSet) === "[object Array]" ) {
+ if ( !prune ) {
+ results.push.apply( results, checkSet );
+
+ } else if ( context && context.nodeType === 1 ) {
+ for ( i = 0; checkSet[i] != null; i++ ) {
+ if ( checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && Sizzle.contains(context, checkSet[i])) ) {
+ results.push( set[i] );
+ }
+ }
+
+ } else {
+ for ( i = 0; checkSet[i] != null; i++ ) {
+ if ( checkSet[i] && checkSet[i].nodeType === 1 ) {
+ results.push( set[i] );
+ }
+ }
+ }
+
+ } else {
+ makeArray( checkSet, results );
+ }
+
+ if ( extra ) {
+ Sizzle( extra, origContext, results, seed );
+ Sizzle.uniqueSort( results );
+ }
+
+ return results;
+};
+
+Sizzle.uniqueSort = function( results ) {
+ if ( sortOrder ) {
+ hasDuplicate = baseHasDuplicate;
+ results.sort( sortOrder );
+
+ if ( hasDuplicate ) {
+ for ( var i = 1; i < results.length; i++ ) {
+ if ( results[i] === results[ i - 1 ] ) {
+ results.splice( i--, 1 );
+ }
+ }
+ }
+ }
+
+ return results;
+};
+
+Sizzle.matches = function( expr, set ) {
+ return Sizzle( expr, null, null, set );
+};
+
+Sizzle.matchesSelector = function( node, expr ) {
+ return Sizzle( expr, null, null, [node] ).length > 0;
+};
+
+Sizzle.find = function( expr, context, isXML ) {
+ var set, i, len, match, type, left;
+
+ if ( !expr ) {
+ return [];
+ }
+
+ for ( i = 0, len = Expr.order.length; i < len; i++ ) {
+ type = Expr.order[i];
+
+ if ( (match = Expr.leftMatch[ type ].exec( expr )) ) {
+ left = match[1];
+ match.splice( 1, 1 );
+
+ if ( left.substr( left.length - 1 ) !== "\\" ) {
+ match[1] = (match[1] || "").replace( rBackslash, "" );
+ set = Expr.find[ type ]( match, context, isXML );
+
+ if ( set != null ) {
+ expr = expr.replace( Expr.match[ type ], "" );
+ break;
+ }
+ }
+ }
+ }
+
+ if ( !set ) {
+ set = typeof context.getElementsByTagName !== "undefined" ?
+ context.getElementsByTagName( "*" ) :
+ [];
+ }
+
+ return { set: set, expr: expr };
+};
+
+Sizzle.filter = function( expr, set, inplace, not ) {
+ var match, anyFound,
+ type, found, item, filter, left,
+ i, pass,
+ old = expr,
+ result = [],
+ curLoop = set,
+ isXMLFilter = set && set[0] && Sizzle.isXML( set[0] );
+
+ while ( expr && set.length ) {
+ for ( type in Expr.filter ) {
+ if ( (match = Expr.leftMatch[ type ].exec( expr )) != null && match[2] ) {
+ filter = Expr.filter[ type ];
+ left = match[1];
+
+ anyFound = false;
+
+ match.splice(1,1);
+
+ if ( left.substr( left.length - 1 ) === "\\" ) {
+ continue;
+ }
+
+ if ( curLoop === result ) {
+ result = [];
+ }
+
+ if ( Expr.preFilter[ type ] ) {
+ match = Expr.preFilter[ type ]( match, curLoop, inplace, result, not, isXMLFilter );
+
+ if ( !match ) {
+ anyFound = found = true;
+
+ } else if ( match === true ) {
+ continue;
+ }
+ }
+
+ if ( match ) {
+ for ( i = 0; (item = curLoop[i]) != null; i++ ) {
+ if ( item ) {
+ found = filter( item, match, i, curLoop );
+ pass = not ^ found;
+
+ if ( inplace && found != null ) {
+ if ( pass ) {
+ anyFound = true;
+
+ } else {
+ curLoop[i] = false;
+ }
+
+ } else if ( pass ) {
+ result.push( item );
+ anyFound = true;
+ }
+ }
+ }
+ }
+
+ if ( found !== undefined ) {
+ if ( !inplace ) {
+ curLoop = result;
+ }
+
+ expr = expr.replace( Expr.match[ type ], "" );
+
+ if ( !anyFound ) {
+ return [];
+ }
+
+ break;
+ }
+ }
+ }
+
+ // Improper expression
+ if ( expr === old ) {
+ if ( anyFound == null ) {
+ Sizzle.error( expr );
+
+ } else {
+ break;
+ }
+ }
+
+ old = expr;
+ }
+
+ return curLoop;
+};
+
+Sizzle.error = function( msg ) {
+ throw new Error( "Syntax error, unrecognized expression: " + msg );
+};
+
+/**
+ * Utility function for retreiving the text value of an array of DOM nodes
+ * @param {Array|Element} elem
+ */
+var getText = Sizzle.getText = function( elem ) {
+ var i, node,
+ nodeType = elem.nodeType,
+ ret = "";
+
+ if ( nodeType ) {
+ if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
+ // Use textContent || innerText for elements
+ if ( typeof elem.textContent === 'string' ) {
+ return elem.textContent;
+ } else if ( typeof elem.innerText === 'string' ) {
+ // Replace IE's carriage returns
+ return elem.innerText.replace( rReturn, '' );
+ } else {
+ // Traverse it's children
+ for ( elem = elem.firstChild; elem; elem = elem.nextSibling) {
+ ret += getText( elem );
+ }
+ }
+ } else if ( nodeType === 3 || nodeType === 4 ) {
+ return elem.nodeValue;
+ }
+ } else {
+
+ // If no nodeType, this is expected to be an array
+ for ( i = 0; (node = elem[i]); i++ ) {
+ // Do not traverse comment nodes
+ if ( node.nodeType !== 8 ) {
+ ret += getText( node );
+ }
+ }
+ }
+ return ret;
+};
+
+var Expr = Sizzle.selectors = {
+ order: [ "ID", "NAME", "TAG" ],
+
+ match: {
+ ID: /#((?:[\w\u00c0-\uFFFF\-]|\\.)+)/,
+ CLASS: /\.((?:[\w\u00c0-\uFFFF\-]|\\.)+)/,
+ NAME: /\[name=['"]*((?:[\w\u00c0-\uFFFF\-]|\\.)+)['"]*\]/,
+ ATTR: /\[\s*((?:[\w\u00c0-\uFFFF\-]|\\.)+)\s*(?:(\S?=)\s*(?:(['"])(.*?)\3|(#?(?:[\w\u00c0-\uFFFF\-]|\\.)*)|)|)\s*\]/,
+ TAG: /^((?:[\w\u00c0-\uFFFF\*\-]|\\.)+)/,
+ CHILD: /:(only|nth|last|first)-child(?:\(\s*(even|odd|(?:[+\-]?\d+|(?:[+\-]?\d*)?n\s*(?:[+\-]\s*\d+)?))\s*\))?/,
+ POS: /:(nth|eq|gt|lt|first|last|even|odd)(?:\((\d*)\))?(?=[^\-]|$)/,
+ PSEUDO: /:((?:[\w\u00c0-\uFFFF\-]|\\.)+)(?:\((['"]?)((?:\([^\)]+\)|[^\(\)]*)+)\2\))?/
+ },
+
+ leftMatch: {},
+
+ attrMap: {
+ "class": "className",
+ "for": "htmlFor"
+ },
+
+ attrHandle: {
+ href: function( elem ) {
+ return elem.getAttribute( "href" );
+ },
+ type: function( elem ) {
+ return elem.getAttribute( "type" );
+ }
+ },
+
+ relative: {
+ "+": function(checkSet, part){
+ var isPartStr = typeof part === "string",
+ isTag = isPartStr && !rNonWord.test( part ),
+ isPartStrNotTag = isPartStr && !isTag;
+
+ if ( isTag ) {
+ part = part.toLowerCase();
+ }
+
+ for ( var i = 0, l = checkSet.length, elem; i < l; i++ ) {
+ if ( (elem = checkSet[i]) ) {
+ while ( (elem = elem.previousSibling) && elem.nodeType !== 1 ) {}
+
+ checkSet[i] = isPartStrNotTag || elem && elem.nodeName.toLowerCase() === part ?
+ elem || false :
+ elem === part;
+ }
+ }
+
+ if ( isPartStrNotTag ) {
+ Sizzle.filter( part, checkSet, true );
+ }
+ },
+
+ ">": function( checkSet, part ) {
+ var elem,
+ isPartStr = typeof part === "string",
+ i = 0,
+ l = checkSet.length;
+
+ if ( isPartStr && !rNonWord.test( part ) ) {
+ part = part.toLowerCase();
+
+ for ( ; i < l; i++ ) {
+ elem = checkSet[i];
+
+ if ( elem ) {
+ var parent = elem.parentNode;
+ checkSet[i] = parent.nodeName.toLowerCase() === part ? parent : false;
+ }
+ }
+
+ } else {
+ for ( ; i < l; i++ ) {
+ elem = checkSet[i];
+
+ if ( elem ) {
+ checkSet[i] = isPartStr ?
+ elem.parentNode :
+ elem.parentNode === part;
+ }
+ }
+
+ if ( isPartStr ) {
+ Sizzle.filter( part, checkSet, true );
+ }
+ }
+ },
+
+ "": function(checkSet, part, isXML){
+ var nodeCheck,
+ doneName = done++,
+ checkFn = dirCheck;
+
+ if ( typeof part === "string" && !rNonWord.test( part ) ) {
+ part = part.toLowerCase();
+ nodeCheck = part;
+ checkFn = dirNodeCheck;
+ }
+
+ checkFn( "parentNode", part, doneName, checkSet, nodeCheck, isXML );
+ },
+
+ "~": function( checkSet, part, isXML ) {
+ var nodeCheck,
+ doneName = done++,
+ checkFn = dirCheck;
+
+ if ( typeof part === "string" && !rNonWord.test( part ) ) {
+ part = part.toLowerCase();
+ nodeCheck = part;
+ checkFn = dirNodeCheck;
+ }
+
+ checkFn( "previousSibling", part, doneName, checkSet, nodeCheck, isXML );
+ }
+ },
+
+ find: {
+ ID: function( match, context, isXML ) {
+ if ( typeof context.getElementById !== "undefined" && !isXML ) {
+ var m = context.getElementById(match[1]);
+ // Check parentNode to catch when Blackberry 4.6 returns
+ // nodes that are no longer in the document #6963
+ return m && m.parentNode ? [m] : [];
+ }
+ },
+
+ NAME: function( match, context ) {
+ if ( typeof context.getElementsByName !== "undefined" ) {
+ var ret = [],
+ results = context.getElementsByName( match[1] );
+
+ for ( var i = 0, l = results.length; i < l; i++ ) {
+ if ( results[i].getAttribute("name") === match[1] ) {
+ ret.push( results[i] );
+ }
+ }
+
+ return ret.length === 0 ? null : ret;
+ }
+ },
+
+ TAG: function( match, context ) {
+ if ( typeof context.getElementsByTagName !== "undefined" ) {
+ return context.getElementsByTagName( match[1] );
+ }
+ }
+ },
+ preFilter: {
+ CLASS: function( match, curLoop, inplace, result, not, isXML ) {
+ match = " " + match[1].replace( rBackslash, "" ) + " ";
+
+ if ( isXML ) {
+ return match;
+ }
+
+ for ( var i = 0, elem; (elem = curLoop[i]) != null; i++ ) {
+ if ( elem ) {
+ if ( not ^ (elem.className && (" " + elem.className + " ").replace(/[\t\n\r]/g, " ").indexOf(match) >= 0) ) {
+ if ( !inplace ) {
+ result.push( elem );
+ }
+
+ } else if ( inplace ) {
+ curLoop[i] = false;
+ }
+ }
+ }
+
+ return false;
+ },
+
+ ID: function( match ) {
+ return match[1].replace( rBackslash, "" );
+ },
+
+ TAG: function( match, curLoop ) {
+ return match[1].replace( rBackslash, "" ).toLowerCase();
+ },
+
+ CHILD: function( match ) {
+ if ( match[1] === "nth" ) {
+ if ( !match[2] ) {
+ Sizzle.error( match[0] );
+ }
+
+ match[2] = match[2].replace(/^\+|\s*/g, '');
+
+ // parse equations like 'even', 'odd', '5', '2n', '3n+2', '4n-1', '-n+6'
+ var test = /(-?)(\d*)(?:n([+\-]?\d*))?/.exec(
+ match[2] === "even" && "2n" || match[2] === "odd" && "2n+1" ||
+ !/\D/.test( match[2] ) && "0n+" + match[2] || match[2]);
+
+ // calculate the numbers (first)n+(last) including if they are negative
+ match[2] = (test[1] + (test[2] || 1)) - 0;
+ match[3] = test[3] - 0;
+ }
+ else if ( match[2] ) {
+ Sizzle.error( match[0] );
+ }
+
+ // TODO: Move to normal caching system
+ match[0] = done++;
+
+ return match;
+ },
+
+ ATTR: function( match, curLoop, inplace, result, not, isXML ) {
+ var name = match[1] = match[1].replace( rBackslash, "" );
+
+ if ( !isXML && Expr.attrMap[name] ) {
+ match[1] = Expr.attrMap[name];
+ }
+
+ // Handle if an un-quoted value was used
+ match[4] = ( match[4] || match[5] || "" ).replace( rBackslash, "" );
+
+ if ( match[2] === "~=" ) {
+ match[4] = " " + match[4] + " ";
+ }
+
+ return match;
+ },
+
+ PSEUDO: function( match, curLoop, inplace, result, not ) {
+ if ( match[1] === "not" ) {
+ // If we're dealing with a complex expression, or a simple one
+ if ( ( chunker.exec(match[3]) || "" ).length > 1 || /^\w/.test(match[3]) ) {
+ match[3] = Sizzle(match[3], null, null, curLoop);
+
+ } else {
+ var ret = Sizzle.filter(match[3], curLoop, inplace, true ^ not);
+
+ if ( !inplace ) {
+ result.push.apply( result, ret );
+ }
+
+ return false;
+ }
+
+ } else if ( Expr.match.POS.test( match[0] ) || Expr.match.CHILD.test( match[0] ) ) {
+ return true;
+ }
+
+ return match;
+ },
+
+ POS: function( match ) {
+ match.unshift( true );
+
+ return match;
+ }
+ },
+
+ filters: {
+ enabled: function( elem ) {
+ return elem.disabled === false && elem.type !== "hidden";
+ },
+
+ disabled: function( elem ) {
+ return elem.disabled === true;
+ },
+
+ checked: function( elem ) {
+ return elem.checked === true;
+ },
+
+ selected: function( elem ) {
+ // Accessing this property makes selected-by-default
+ // options in Safari work properly
+ if ( elem.parentNode ) {
+ elem.parentNode.selectedIndex;
+ }
+
+ return elem.selected === true;
+ },
+
+ parent: function( elem ) {
+ return !!elem.firstChild;
+ },
+
+ empty: function( elem ) {
+ return !elem.firstChild;
+ },
+
+ has: function( elem, i, match ) {
+ return !!Sizzle( match[3], elem ).length;
+ },
+
+ header: function( elem ) {
+ return (/h\d/i).test( elem.nodeName );
+ },
+
+ text: function( elem ) {
+ var attr = elem.getAttribute( "type" ), type = elem.type;
+ // IE6 and 7 will map elem.type to 'text' for new HTML5 types (search, etc)
+ // use getAttribute instead to test this case
+ return elem.nodeName.toLowerCase() === "input" && "text" === type && ( attr === type || attr === null );
+ },
+
+ radio: function( elem ) {
+ return elem.nodeName.toLowerCase() === "input" && "radio" === elem.type;
+ },
+
+ checkbox: function( elem ) {
+ return elem.nodeName.toLowerCase() === "input" && "checkbox" === elem.type;
+ },
+
+ file: function( elem ) {
+ return elem.nodeName.toLowerCase() === "input" && "file" === elem.type;
+ },
+
+ password: function( elem ) {
+ return elem.nodeName.toLowerCase() === "input" && "password" === elem.type;
+ },
+
+ submit: function( elem ) {
+ var name = elem.nodeName.toLowerCase();
+ return (name === "input" || name === "button") && "submit" === elem.type;
+ },
+
+ image: function( elem ) {
+ return elem.nodeName.toLowerCase() === "input" && "image" === elem.type;
+ },
+
+ reset: function( elem ) {
+ var name = elem.nodeName.toLowerCase();
+ return (name === "input" || name === "button") && "reset" === elem.type;
+ },
+
+ button: function( elem ) {
+ var name = elem.nodeName.toLowerCase();
+ return name === "input" && "button" === elem.type || name === "button";
+ },
+
+ input: function( elem ) {
+ return (/input|select|textarea|button/i).test( elem.nodeName );
+ },
+
+ focus: function( elem ) {
+ return elem === elem.ownerDocument.activeElement;
+ }
+ },
+ setFilters: {
+ first: function( elem, i ) {
+ return i === 0;
+ },
+
+ last: function( elem, i, match, array ) {
+ return i === array.length - 1;
+ },
+
+ even: function( elem, i ) {
+ return i % 2 === 0;
+ },
+
+ odd: function( elem, i ) {
+ return i % 2 === 1;
+ },
+
+ lt: function( elem, i, match ) {
+ return i < match[3] - 0;
+ },
+
+ gt: function( elem, i, match ) {
+ return i > match[3] - 0;
+ },
+
+ nth: function( elem, i, match ) {
+ return match[3] - 0 === i;
+ },
+
+ eq: function( elem, i, match ) {
+ return match[3] - 0 === i;
+ }
+ },
+ filter: {
+ PSEUDO: function( elem, match, i, array ) {
+ var name = match[1],
+ filter = Expr.filters[ name ];
+
+ if ( filter ) {
+ return filter( elem, i, match, array );
+
+ } else if ( name === "contains" ) {
+ return (elem.textContent || elem.innerText || getText([ elem ]) || "").indexOf(match[3]) >= 0;
+
+ } else if ( name === "not" ) {
+ var not = match[3];
+
+ for ( var j = 0, l = not.length; j < l; j++ ) {
+ if ( not[j] === elem ) {
+ return false;
+ }
+ }
+
+ return true;
+
+ } else {
+ Sizzle.error( name );
+ }
+ },
+
+ CHILD: function( elem, match ) {
+ var first, last,
+ doneName, parent, cache,
+ count, diff,
+ type = match[1],
+ node = elem;
+
+ switch ( type ) {
+ case "only":
+ case "first":
+ while ( (node = node.previousSibling) ) {
+ if ( node.nodeType === 1 ) {
+ return false;
+ }
+ }
+
+ if ( type === "first" ) {
+ return true;
+ }
+
+ node = elem;
+
+ /* falls through */
+ case "last":
+ while ( (node = node.nextSibling) ) {
+ if ( node.nodeType === 1 ) {
+ return false;
+ }
+ }
+
+ return true;
+
+ case "nth":
+ first = match[2];
+ last = match[3];
+
+ if ( first === 1 && last === 0 ) {
+ return true;
+ }
+
+ doneName = match[0];
+ parent = elem.parentNode;
+
+ if ( parent && (parent[ expando ] !== doneName || !elem.nodeIndex) ) {
+ count = 0;
+
+ for ( node = parent.firstChild; node; node = node.nextSibling ) {
+ if ( node.nodeType === 1 ) {
+ node.nodeIndex = ++count;
+ }
+ }
+
+ parent[ expando ] = doneName;
+ }
+
+ diff = elem.nodeIndex - last;
+
+ if ( first === 0 ) {
+ return diff === 0;
+
+ } else {
+ return ( diff % first === 0 && diff / first >= 0 );
+ }
+ }
+ },
+
+ ID: function( elem, match ) {
+ return elem.nodeType === 1 && elem.getAttribute("id") === match;
+ },
+
+ TAG: function( elem, match ) {
+ return (match === "*" && elem.nodeType === 1) || !!elem.nodeName && elem.nodeName.toLowerCase() === match;
+ },
+
+ CLASS: function( elem, match ) {
+ return (" " + (elem.className || elem.getAttribute("class")) + " ")
+ .indexOf( match ) > -1;
+ },
+
+ ATTR: function( elem, match ) {
+ var name = match[1],
+ result = Sizzle.attr ?
+ Sizzle.attr( elem, name ) :
+ Expr.attrHandle[ name ] ?
+ Expr.attrHandle[ name ]( elem ) :
+ elem[ name ] != null ?
+ elem[ name ] :
+ elem.getAttribute( name ),
+ value = result + "",
+ type = match[2],
+ check = match[4];
+
+ return result == null ?
+ type === "!=" :
+ !type && Sizzle.attr ?
+ result != null :
+ type === "=" ?
+ value === check :
+ type === "*=" ?
+ value.indexOf(check) >= 0 :
+ type === "~=" ?
+ (" " + value + " ").indexOf(check) >= 0 :
+ !check ?
+ value && result !== false :
+ type === "!=" ?
+ value !== check :
+ type === "^=" ?
+ value.indexOf(check) === 0 :
+ type === "$=" ?
+ value.substr(value.length - check.length) === check :
+ type === "|=" ?
+ value === check || value.substr(0, check.length + 1) === check + "-" :
+ false;
+ },
+
+ POS: function( elem, match, i, array ) {
+ var name = match[2],
+ filter = Expr.setFilters[ name ];
+
+ if ( filter ) {
+ return filter( elem, i, match, array );
+ }
+ }
+ }
+};
+
+var origPOS = Expr.match.POS,
+ fescape = function(all, num){
+ return "\\" + (num - 0 + 1);
+ };
+
+for ( var type in Expr.match ) {
+ Expr.match[ type ] = new RegExp( Expr.match[ type ].source + (/(?![^\[]*\])(?![^\(]*\))/.source) );
+ Expr.leftMatch[ type ] = new RegExp( /(^(?:.|\r|\n)*?)/.source + Expr.match[ type ].source.replace(/\\(\d+)/g, fescape) );
+}
+// Expose origPOS
+// "global" as in regardless of relation to brackets/parens
+Expr.match.globalPOS = origPOS;
+
+var makeArray = function( array, results ) {
+ array = Array.prototype.slice.call( array, 0 );
+
+ if ( results ) {
+ results.push.apply( results, array );
+ return results;
+ }
+
+ return array;
+};
+
+// Perform a simple check to determine if the browser is capable of
+// converting a NodeList to an array using builtin methods.
+// Also verifies that the returned array holds DOM nodes
+// (which is not the case in the Blackberry browser)
+try {
+ Array.prototype.slice.call( document.documentElement.childNodes, 0 )[0].nodeType;
+
+// Provide a fallback method if it does not work
+} catch( e ) {
+ makeArray = function( array, results ) {
+ var i = 0,
+ ret = results || [];
+
+ if ( toString.call(array) === "[object Array]" ) {
+ Array.prototype.push.apply( ret, array );
+
+ } else {
+ if ( typeof array.length === "number" ) {
+ for ( var l = array.length; i < l; i++ ) {
+ ret.push( array[i] );
+ }
+
+ } else {
+ for ( ; array[i]; i++ ) {
+ ret.push( array[i] );
+ }
+ }
+ }
+
+ return ret;
+ };
+}
+
+var sortOrder, siblingCheck;
+
+if ( document.documentElement.compareDocumentPosition ) {
+ sortOrder = function( a, b ) {
+ if ( a === b ) {
+ hasDuplicate = true;
+ return 0;
+ }
+
+ if ( !a.compareDocumentPosition || !b.compareDocumentPosition ) {
+ return a.compareDocumentPosition ? -1 : 1;
+ }
+
+ return a.compareDocumentPosition(b) & 4 ? -1 : 1;
+ };
+
+} else {
+ sortOrder = function( a, b ) {
+ // The nodes are identical, we can exit early
+ if ( a === b ) {
+ hasDuplicate = true;
+ return 0;
+
+ // Fallback to using sourceIndex (in IE) if it's available on both nodes
+ } else if ( a.sourceIndex && b.sourceIndex ) {
+ return a.sourceIndex - b.sourceIndex;
+ }
+
+ var al, bl,
+ ap = [],
+ bp = [],
+ aup = a.parentNode,
+ bup = b.parentNode,
+ cur = aup;
+
+ // If the nodes are siblings (or identical) we can do a quick check
+ if ( aup === bup ) {
+ return siblingCheck( a, b );
+
+ // If no parents were found then the nodes are disconnected
+ } else if ( !aup ) {
+ return -1;
+
+ } else if ( !bup ) {
+ return 1;
+ }
+
+ // Otherwise they're somewhere else in the tree so we need
+ // to build up a full list of the parentNodes for comparison
+ while ( cur ) {
+ ap.unshift( cur );
+ cur = cur.parentNode;
+ }
+
+ cur = bup;
+
+ while ( cur ) {
+ bp.unshift( cur );
+ cur = cur.parentNode;
+ }
+
+ al = ap.length;
+ bl = bp.length;
+
+ // Start walking down the tree looking for a discrepancy
+ for ( var i = 0; i < al && i < bl; i++ ) {
+ if ( ap[i] !== bp[i] ) {
+ return siblingCheck( ap[i], bp[i] );
+ }
+ }
+
+ // We ended someplace up the tree so do a sibling check
+ return i === al ?
+ siblingCheck( a, bp[i], -1 ) :
+ siblingCheck( ap[i], b, 1 );
+ };
+
+ siblingCheck = function( a, b, ret ) {
+ if ( a === b ) {
+ return ret;
+ }
+
+ var cur = a.nextSibling;
+
+ while ( cur ) {
+ if ( cur === b ) {
+ return -1;
+ }
+
+ cur = cur.nextSibling;
+ }
+
+ return 1;
+ };
+}
+
+// Check to see if the browser returns elements by name when
+// querying by getElementById (and provide a workaround)
+(function(){
+ // We're going to inject a fake input element with a specified name
+ var form = document.createElement("div"),
+ id = "script" + (new Date()).getTime(),
+ root = document.documentElement;
+
+ form.innerHTML = "<a name='" + id + "'/>";
+
+ // Inject it into the root element, check its status, and remove it quickly
+ root.insertBefore( form, root.firstChild );
+
+ // The workaround has to do additional checks after a getElementById
+ // Which slows things down for other browsers (hence the branching)
+ if ( document.getElementById( id ) ) {
+ Expr.find.ID = function( match, context, isXML ) {
+ if ( typeof context.getElementById !== "undefined" && !isXML ) {
+ var m = context.getElementById(match[1]);
+
+ return m ?
+ m.id === match[1] || typeof m.getAttributeNode !== "undefined" && m.getAttributeNode("id").nodeValue === match[1] ?
+ [m] :
+ undefined :
+ [];
+ }
+ };
+
+ Expr.filter.ID = function( elem, match ) {
+ var node = typeof elem.getAttributeNode !== "undefined" && elem.getAttributeNode("id");
+
+ return elem.nodeType === 1 && node && node.nodeValue === match;
+ };
+ }
+
+ root.removeChild( form );
+
+ // release memory in IE
+ root = form = null;
+})();
+
+(function(){
+ // Check to see if the browser returns only elements
+ // when doing getElementsByTagName("*")
+
+ // Create a fake element
+ var div = document.createElement("div");
+ div.appendChild( document.createComment("") );
+
+ // Make sure no comments are found
+ if ( div.getElementsByTagName("*").length > 0 ) {
+ Expr.find.TAG = function( match, context ) {
+ var results = context.getElementsByTagName( match[1] );
+
+ // Filter out possible comments
+ if ( match[1] === "*" ) {
+ var tmp = [];
+
+ for ( var i = 0; results[i]; i++ ) {
+ if ( results[i].nodeType === 1 ) {
+ tmp.push( results[i] );
+ }
+ }
+
+ results = tmp;
+ }
+
+ return results;
+ };
+ }
+
+ // Check to see if an attribute returns normalized href attributes
+ div.innerHTML = "<a href='#'></a>";
+
+ if ( div.firstChild && typeof div.firstChild.getAttribute !== "undefined" &&
+ div.firstChild.getAttribute("href") !== "#" ) {
+
+ Expr.attrHandle.href = function( elem ) {
+ return elem.getAttribute( "href", 2 );
+ };
+ }
+
+ // release memory in IE
+ div = null;
+})();
+
+if ( document.querySelectorAll ) {
+ (function(){
+ var oldSizzle = Sizzle,
+ div = document.createElement("div"),
+ id = "__sizzle__";
+
+ div.innerHTML = "<p class='TEST'></p>";
+
+ // Safari can't handle uppercase or unicode characters when
+ // in quirks mode.
+ if ( div.querySelectorAll && div.querySelectorAll(".TEST").length === 0 ) {
+ return;
+ }
+
+ Sizzle = function( query, context, extra, seed ) {
+ context = context || document;
+
+ // Only use querySelectorAll on non-XML documents
+ // (ID selectors don't work in non-HTML documents)
+ if ( !seed && !Sizzle.isXML(context) ) {
+ // See if we find a selector to speed up
+ var match = /^(\w+$)|^\.([\w\-]+$)|^#([\w\-]+$)/.exec( query );
+
+ if ( match && (context.nodeType === 1 || context.nodeType === 9) ) {
+ // Speed-up: Sizzle("TAG")
+ if ( match[1] ) {
+ return makeArray( context.getElementsByTagName( query ), extra );
+
+ // Speed-up: Sizzle(".CLASS")
+ } else if ( match[2] && Expr.find.CLASS && context.getElementsByClassName ) {
+ return makeArray( context.getElementsByClassName( match[2] ), extra );
+ }
+ }
+
+ if ( context.nodeType === 9 ) {
+ // Speed-up: Sizzle("body")
+ // The body element only exists once, optimize finding it
+ if ( query === "body" && context.body ) {
+ return makeArray( [ context.body ], extra );
+
+ // Speed-up: Sizzle("#ID")
+ } else if ( match && match[3] ) {
+ var elem = context.getElementById( match[3] );
+
+ // Check parentNode to catch when Blackberry 4.6 returns
+ // nodes that are no longer in the document #6963
+ if ( elem && elem.parentNode ) {
+ // Handle the case where IE and Opera return items
+ // by name instead of ID
+ if ( elem.id === match[3] ) {
+ return makeArray( [ elem ], extra );
+ }
+
+ } else {
+ return makeArray( [], extra );
+ }
+ }
+
+ try {
+ return makeArray( context.querySelectorAll(query), extra );
+ } catch(qsaError) {}
+
+ // qSA works strangely on Element-rooted queries
+ // We can work around this by specifying an extra ID on the root
+ // and working up from there (Thanks to Andrew Dupont for the technique)
+ // IE 8 doesn't work on object elements
+ } else if ( context.nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
+ var oldContext = context,
+ old = context.getAttribute( "id" ),
+ nid = old || id,
+ hasParent = context.parentNode,
+ relativeHierarchySelector = /^\s*[+~]/.test( query );
+
+ if ( !old ) {
+ context.setAttribute( "id", nid );
+ } else {
+ nid = nid.replace( /'/g, "\\$&" );
+ }
+ if ( relativeHierarchySelector && hasParent ) {
+ context = context.parentNode;
+ }
+
+ try {
+ if ( !relativeHierarchySelector || hasParent ) {
+ return makeArray( context.querySelectorAll( "[id='" + nid + "'] " + query ), extra );
+ }
+
+ } catch(pseudoError) {
+ } finally {
+ if ( !old ) {
+ oldContext.removeAttribute( "id" );
+ }
+ }
+ }
+ }
+
+ return oldSizzle(query, context, extra, seed);
+ };
+
+ for ( var prop in oldSizzle ) {
+ Sizzle[ prop ] = oldSizzle[ prop ];
+ }
+
+ // release memory in IE
+ div = null;
+ })();
+}
+
+(function(){
+ var html = document.documentElement,
+ matches = html.matchesSelector || html.mozMatchesSelector || html.webkitMatchesSelector || html.msMatchesSelector;
+
+ if ( matches ) {
+ // Check to see if it's possible to do matchesSelector
+ // on a disconnected node (IE 9 fails this)
+ var disconnectedMatch = !matches.call( document.createElement( "div" ), "div" ),
+ pseudoWorks = false;
+
+ try {
+ // This should fail with an exception
+ // Gecko does not error, returns false instead
+ matches.call( document.documentElement, "[test!='']:sizzle" );
+
+ } catch( pseudoError ) {
+ pseudoWorks = true;
+ }
+
+ Sizzle.matchesSelector = function( node, expr ) {
+ // Make sure that attribute selectors are quoted
+ expr = expr.replace(/\=\s*([^'"\]]*)\s*\]/g, "='$1']");
+
+ if ( !Sizzle.isXML( node ) ) {
+ try {
+ if ( pseudoWorks || !Expr.match.PSEUDO.test( expr ) && !/!=/.test( expr ) ) {
+ var ret = matches.call( node, expr );
+
+ // IE 9's matchesSelector returns false on disconnected nodes
+ if ( ret || !disconnectedMatch ||
+ // As well, disconnected nodes are said to be in a document
+ // fragment in IE 9, so check for that
+ node.document && node.document.nodeType !== 11 ) {
+ return ret;
+ }
+ }
+ } catch(e) {}
+ }
+
+ return Sizzle(expr, null, null, [node]).length > 0;
+ };
+ }
+})();
+
+(function(){
+ var div = document.createElement("div");
+
+ div.innerHTML = "<div class='test e'></div><div class='test'></div>";
+
+ // Opera can't find a second classname (in 9.6)
+ // Also, make sure that getElementsByClassName actually exists
+ if ( !div.getElementsByClassName || div.getElementsByClassName("e").length === 0 ) {
+ return;
+ }
+
+ // Safari caches class attributes, doesn't catch changes (in 3.2)
+ div.lastChild.className = "e";
+
+ if ( div.getElementsByClassName("e").length === 1 ) {
+ return;
+ }
+
+ Expr.order.splice(1, 0, "CLASS");
+ Expr.find.CLASS = function( match, context, isXML ) {
+ if ( typeof context.getElementsByClassName !== "undefined" && !isXML ) {
+ return context.getElementsByClassName(match[1]);
+ }
+ };
+
+ // release memory in IE
+ div = null;
+})();
+
+function dirNodeCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
+ for ( var i = 0, l = checkSet.length; i < l; i++ ) {
+ var elem = checkSet[i];
+
+ if ( elem ) {
+ var match = false;
+
+ elem = elem[dir];
+
+ while ( elem ) {
+ if ( elem[ expando ] === doneName ) {
+ match = checkSet[elem.sizset];
+ break;
+ }
+
+ if ( elem.nodeType === 1 && !isXML ){
+ elem[ expando ] = doneName;
+ elem.sizset = i;
+ }
+
+ if ( elem.nodeName.toLowerCase() === cur ) {
+ match = elem;
+ break;
+ }
+
+ elem = elem[dir];
+ }
+
+ checkSet[i] = match;
+ }
+ }
+}
+
+function dirCheck( dir, cur, doneName, checkSet, nodeCheck, isXML ) {
+ for ( var i = 0, l = checkSet.length; i < l; i++ ) {
+ var elem = checkSet[i];
+
+ if ( elem ) {
+ var match = false;
+
+ elem = elem[dir];
+
+ while ( elem ) {
+ if ( elem[ expando ] === doneName ) {
+ match = checkSet[elem.sizset];
+ break;
+ }
+
+ if ( elem.nodeType === 1 ) {
+ if ( !isXML ) {
+ elem[ expando ] = doneName;
+ elem.sizset = i;
+ }
+
+ if ( typeof cur !== "string" ) {
+ if ( elem === cur ) {
+ match = true;
+ break;
+ }
+
+ } else if ( Sizzle.filter( cur, [elem] ).length > 0 ) {
+ match = elem;
+ break;
+ }
+ }
+
+ elem = elem[dir];
+ }
+
+ checkSet[i] = match;
+ }
+ }
+}
+
+if ( document.documentElement.contains ) {
+ Sizzle.contains = function( a, b ) {
+ return a !== b && (a.contains ? a.contains(b) : true);
+ };
+
+} else if ( document.documentElement.compareDocumentPosition ) {
+ Sizzle.contains = function( a, b ) {
+ return !!(a.compareDocumentPosition(b) & 16);
+ };
+
+} else {
+ Sizzle.contains = function() {
+ return false;
+ };
+}
+
+Sizzle.isXML = function( elem ) {
+ // documentElement is verified for cases where it doesn't yet exist
+ // (such as loading iframes in IE - #4833)
+ var documentElement = (elem ? elem.ownerDocument || elem : 0).documentElement;
+
+ return documentElement ? documentElement.nodeName !== "HTML" : false;
+};
+
+var posProcess = function( selector, context, seed ) {
+ var match,
+ tmpSet = [],
+ later = "",
+ root = context.nodeType ? [context] : context;
+
+ // Position selectors must be done after the filter
+ // And so must :not(positional) so we move all PSEUDOs to the end
+ while ( (match = Expr.match.PSEUDO.exec( selector )) ) {
+ later += match[0];
+ selector = selector.replace( Expr.match.PSEUDO, "" );
+ }
+
+ selector = Expr.relative[selector] ? selector + "*" : selector;
+
+ for ( var i = 0, l = root.length; i < l; i++ ) {
+ Sizzle( selector, root[i], tmpSet, seed );
+ }
+
+ return Sizzle.filter( later, tmpSet );
+};
+
+// EXPOSE
+// Override sizzle attribute retrieval
+Sizzle.attr = jQuery.attr;
+Sizzle.selectors.attrMap = {};
+jQuery.find = Sizzle;
+jQuery.expr = Sizzle.selectors;
+jQuery.expr[":"] = jQuery.expr.filters;
+jQuery.unique = Sizzle.uniqueSort;
+jQuery.text = Sizzle.getText;
+jQuery.isXMLDoc = Sizzle.isXML;
+jQuery.contains = Sizzle.contains;
+
+
+})();
+
+
+var runtil = /Until$/,
+ rparentsprev = /^(?:parents|prevUntil|prevAll)/,
+ // Note: This RegExp should be improved, or likely pulled from Sizzle
+ rmultiselector = /,/,
+ isSimple = /^.[^:#\[\.,]*$/,
+ slice = Array.prototype.slice,
+ POS = jQuery.expr.match.globalPOS,
+ // methods guaranteed to produce a unique set when starting from a unique set
+ guaranteedUnique = {
+ children: true,
+ contents: true,
+ next: true,
+ prev: true
+ };
+
+jQuery.fn.extend({
+ find: function( selector ) {
+ var self = this,
+ i, l;
+
+ if ( typeof selector !== "string" ) {
+ return jQuery( selector ).filter(function() {
+ for ( i = 0, l = self.length; i < l; i++ ) {
+ if ( jQuery.contains( self[ i ], this ) ) {
+ return true;
+ }
+ }
+ });
+ }
+
+ var ret = this.pushStack( "", "find", selector ),
+ length, n, r;
+
+ for ( i = 0, l = this.length; i < l; i++ ) {
+ length = ret.length;
+ jQuery.find( selector, this[i], ret );
+
+ if ( i > 0 ) {
+ // Make sure that the results are unique
+ for ( n = length; n < ret.length; n++ ) {
+ for ( r = 0; r < length; r++ ) {
+ if ( ret[r] === ret[n] ) {
+ ret.splice(n--, 1);
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ return ret;
+ },
+
+ has: function( target ) {
+ var targets = jQuery( target );
+ return this.filter(function() {
+ for ( var i = 0, l = targets.length; i < l; i++ ) {
+ if ( jQuery.contains( this, targets[i] ) ) {
+ return true;
+ }
+ }
+ });
+ },
+
+ not: function( selector ) {
+ return this.pushStack( winnow(this, selector, false), "not", selector);
+ },
+
+ filter: function( selector ) {
+ return this.pushStack( winnow(this, selector, true), "filter", selector );
+ },
+
+ is: function( selector ) {
+ return !!selector && (
+ typeof selector === "string" ?
+ // If this is a positional selector, check membership in the returned set
+ // so $("p:first").is("p:last") won't return true for a doc with two "p".
+ POS.test( selector ) ?
+ jQuery( selector, this.context ).index( this[0] ) >= 0 :
+ jQuery.filter( selector, this ).length > 0 :
+ this.filter( selector ).length > 0 );
+ },
+
+ closest: function( selectors, context ) {
+ var ret = [], i, l, cur = this[0];
+
+ // Array (deprecated as of jQuery 1.7)
+ if ( jQuery.isArray( selectors ) ) {
+ var level = 1;
+
+ while ( cur && cur.ownerDocument && cur !== context ) {
+ for ( i = 0; i < selectors.length; i++ ) {
+
+ if ( jQuery( cur ).is( selectors[ i ] ) ) {
+ ret.push({ selector: selectors[ i ], elem: cur, level: level });
+ }
+ }
+
+ cur = cur.parentNode;
+ level++;
+ }
+
+ return ret;
+ }
+
+ // String
+ var pos = POS.test( selectors ) || typeof selectors !== "string" ?
+ jQuery( selectors, context || this.context ) :
+ 0;
+
+ for ( i = 0, l = this.length; i < l; i++ ) {
+ cur = this[i];
+
+ while ( cur ) {
+ if ( pos ? pos.index(cur) > -1 : jQuery.find.matchesSelector(cur, selectors) ) {
+ ret.push( cur );
+ break;
+
+ } else {
+ cur = cur.parentNode;
+ if ( !cur || !cur.ownerDocument || cur === context || cur.nodeType === 11 ) {
+ break;
+ }
+ }
+ }
+ }
+
+ ret = ret.length > 1 ? jQuery.unique( ret ) : ret;
+
+ return this.pushStack( ret, "closest", selectors );
+ },
+
+ // Determine the position of an element within
+ // the matched set of elements
+ index: function( elem ) {
+
+ // No argument, return index in parent
+ if ( !elem ) {
+ return ( this[0] && this[0].parentNode ) ? this.prevAll().length : -1;
+ }
+
+ // index in selector
+ if ( typeof elem === "string" ) {
+ return jQuery.inArray( this[0], jQuery( elem ) );
+ }
+
+ // Locate the position of the desired element
+ return jQuery.inArray(
+ // If it receives a jQuery object, the first element is used
+ elem.jquery ? elem[0] : elem, this );
+ },
+
+ add: function( selector, context ) {
+ var set = typeof selector === "string" ?
+ jQuery( selector, context ) :
+ jQuery.makeArray( selector && selector.nodeType ? [ selector ] : selector ),
+ all = jQuery.merge( this.get(), set );
+
+ return this.pushStack( isDisconnected( set[0] ) || isDisconnected( all[0] ) ?
+ all :
+ jQuery.unique( all ) );
+ },
+
+ andSelf: function() {
+ return this.add( this.prevObject );
+ }
+});
+
+// A painfully simple check to see if an element is disconnected
+// from a document (should be improved, where feasible).
+function isDisconnected( node ) {
+ return !node || !node.parentNode || node.parentNode.nodeType === 11;
+}
+
+jQuery.each({
+ parent: function( elem ) {
+ var parent = elem.parentNode;
+ return parent && parent.nodeType !== 11 ? parent : null;
+ },
+ parents: function( elem ) {
+ return jQuery.dir( elem, "parentNode" );
+ },
+ parentsUntil: function( elem, i, until ) {
+ return jQuery.dir( elem, "parentNode", until );
+ },
+ next: function( elem ) {
+ return jQuery.nth( elem, 2, "nextSibling" );
+ },
+ prev: function( elem ) {
+ return jQuery.nth( elem, 2, "previousSibling" );
+ },
+ nextAll: function( elem ) {
+ return jQuery.dir( elem, "nextSibling" );
+ },
+ prevAll: function( elem ) {
+ return jQuery.dir( elem, "previousSibling" );
+ },
+ nextUntil: function( elem, i, until ) {
+ return jQuery.dir( elem, "nextSibling", until );
+ },
+ prevUntil: function( elem, i, until ) {
+ return jQuery.dir( elem, "previousSibling", until );
+ },
+ siblings: function( elem ) {
+ return jQuery.sibling( ( elem.parentNode || {} ).firstChild, elem );
+ },
+ children: function( elem ) {
+ return jQuery.sibling( elem.firstChild );
+ },
+ contents: function( elem ) {
+ return jQuery.nodeName( elem, "iframe" ) ?
+ elem.contentDocument || elem.contentWindow.document :
+ jQuery.makeArray( elem.childNodes );
+ }
+}, function( name, fn ) {
+ jQuery.fn[ name ] = function( until, selector ) {
+ var ret = jQuery.map( this, fn, until );
+
+ if ( !runtil.test( name ) ) {
+ selector = until;
+ }
+
+ if ( selector && typeof selector === "string" ) {
+ ret = jQuery.filter( selector, ret );
+ }
+
+ ret = this.length > 1 && !guaranteedUnique[ name ] ? jQuery.unique( ret ) : ret;
+
+ if ( (this.length > 1 || rmultiselector.test( selector )) && rparentsprev.test( name ) ) {
+ ret = ret.reverse();
+ }
+
+ return this.pushStack( ret, name, slice.call( arguments ).join(",") );
+ };
+});
+
+jQuery.extend({
+ filter: function( expr, elems, not ) {
+ if ( not ) {
+ expr = ":not(" + expr + ")";
+ }
+
+ return elems.length === 1 ?
+ jQuery.find.matchesSelector(elems[0], expr) ? [ elems[0] ] : [] :
+ jQuery.find.matches(expr, elems);
+ },
+
+ dir: function( elem, dir, until ) {
+ var matched = [],
+ cur = elem[ dir ];
+
+ while ( cur && cur.nodeType !== 9 && (until === undefined || cur.nodeType !== 1 || !jQuery( cur ).is( until )) ) {
+ if ( cur.nodeType === 1 ) {
+ matched.push( cur );
+ }
+ cur = cur[dir];
+ }
+ return matched;
+ },
+
+ nth: function( cur, result, dir, elem ) {
+ result = result || 1;
+ var num = 0;
+
+ for ( ; cur; cur = cur[dir] ) {
+ if ( cur.nodeType === 1 && ++num === result ) {
+ break;
+ }
+ }
+
+ return cur;
+ },
+
+ sibling: function( n, elem ) {
+ var r = [];
+
+ for ( ; n; n = n.nextSibling ) {
+ if ( n.nodeType === 1 && n !== elem ) {
+ r.push( n );
+ }
+ }
+
+ return r;
+ }
+});
+
+// Implement the identical functionality for filter and not
+function winnow( elements, qualifier, keep ) {
+
+ // Can't pass null or undefined to indexOf in Firefox 4
+ // Set to 0 to skip string check
+ qualifier = qualifier || 0;
+
+ if ( jQuery.isFunction( qualifier ) ) {
+ return jQuery.grep(elements, function( elem, i ) {
+ var retVal = !!qualifier.call( elem, i, elem );
+ return retVal === keep;
+ });
+
+ } else if ( qualifier.nodeType ) {
+ return jQuery.grep(elements, function( elem, i ) {
+ return ( elem === qualifier ) === keep;
+ });
+
+ } else if ( typeof qualifier === "string" ) {
+ var filtered = jQuery.grep(elements, function( elem ) {
+ return elem.nodeType === 1;
+ });
+
+ if ( isSimple.test( qualifier ) ) {
+ return jQuery.filter(qualifier, filtered, !keep);
+ } else {
+ qualifier = jQuery.filter( qualifier, filtered );
+ }
+ }
+
+ return jQuery.grep(elements, function( elem, i ) {
+ return ( jQuery.inArray( elem, qualifier ) >= 0 ) === keep;
+ });
+}
+
+
+
+
+function createSafeFragment( document ) {
+ var list = nodeNames.split( "|" ),
+ safeFrag = document.createDocumentFragment();
+
+ if ( safeFrag.createElement ) {
+ while ( list.length ) {
+ safeFrag.createElement(
+ list.pop()
+ );
+ }
+ }
+ return safeFrag;
+}
+
+var nodeNames = "abbr|article|aside|audio|bdi|canvas|data|datalist|details|figcaption|figure|footer|" +
+ "header|hgroup|mark|meter|nav|output|progress|section|summary|time|video",
+ rinlinejQuery = / jQuery\d+="(?:\d+|null)"/g,
+ rleadingWhitespace = /^\s+/,
+ rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/ig,
+ rtagName = /<([\w:]+)/,
+ rtbody = /<tbody/i,
+ rhtml = /<|&#?\w+;/,
+ rnoInnerhtml = /<(?:script|style)/i,
+ rnocache = /<(?:script|object|embed|option|style)/i,
+ rnoshimcache = new RegExp("<(?:" + nodeNames + ")[\\s/>]", "i"),
+ // checked="checked" or checked
+ rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
+ rscriptType = /\/(java|ecma)script/i,
+ rcleanScript = /^\s*<!(?:\[CDATA\[|\-\-)/,
+ wrapMap = {
+ option: [ 1, "<select multiple='multiple'>", "</select>" ],
+ legend: [ 1, "<fieldset>", "</fieldset>" ],
+ thead: [ 1, "<table>", "</table>" ],
+ tr: [ 2, "<table><tbody>", "</tbody></table>" ],
+ td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],
+ col: [ 2, "<table><tbody></tbody><colgroup>", "</colgroup></table>" ],
+ area: [ 1, "<map>", "</map>" ],
+ _default: [ 0, "", "" ]
+ },
+ safeFragment = createSafeFragment( document );
+
+wrapMap.optgroup = wrapMap.option;
+wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
+wrapMap.th = wrapMap.td;
+
+// IE can't serialize <link> and <script> tags normally
+if ( !jQuery.support.htmlSerialize ) {
+ wrapMap._default = [ 1, "div<div>", "</div>" ];
+}
+
+jQuery.fn.extend({
+ text: function( value ) {
+ return jQuery.access( this, function( value ) {
+ return value === undefined ?
+ jQuery.text( this ) :
+ this.empty().append( ( this[0] && this[0].ownerDocument || document ).createTextNode( value ) );
+ }, null, value, arguments.length );
+ },
+
+ wrapAll: function( html ) {
+ if ( jQuery.isFunction( html ) ) {
+ return this.each(function(i) {
+ jQuery(this).wrapAll( html.call(this, i) );
+ });
+ }
+
+ if ( this[0] ) {
+ // The elements to wrap the target around
+ var wrap = jQuery( html, this[0].ownerDocument ).eq(0).clone(true);
+
+ if ( this[0].parentNode ) {
+ wrap.insertBefore( this[0] );
+ }
+
+ wrap.map(function() {
+ var elem = this;
+
+ while ( elem.firstChild && elem.firstChild.nodeType === 1 ) {
+ elem = elem.firstChild;
+ }
+
+ return elem;
+ }).append( this );
+ }
+
+ return this;
+ },
+
+ wrapInner: function( html ) {
+ if ( jQuery.isFunction( html ) ) {
+ return this.each(function(i) {
+ jQuery(this).wrapInner( html.call(this, i) );
+ });
+ }
+
+ return this.each(function() {
+ var self = jQuery( this ),
+ contents = self.contents();
+
+ if ( contents.length ) {
+ contents.wrapAll( html );
+
+ } else {
+ self.append( html );
+ }
+ });
+ },
+
+ wrap: function( html ) {
+ var isFunction = jQuery.isFunction( html );
+
+ return this.each(function(i) {
+ jQuery( this ).wrapAll( isFunction ? html.call(this, i) : html );
+ });
+ },
+
+ unwrap: function() {
+ return this.parent().each(function() {
+ if ( !jQuery.nodeName( this, "body" ) ) {
+ jQuery( this ).replaceWith( this.childNodes );
+ }
+ }).end();
+ },
+
+ append: function() {
+ return this.domManip(arguments, true, function( elem ) {
+ if ( this.nodeType === 1 ) {
+ this.appendChild( elem );
+ }
+ });
+ },
+
+ prepend: function() {
+ return this.domManip(arguments, true, function( elem ) {
+ if ( this.nodeType === 1 ) {
+ this.insertBefore( elem, this.firstChild );
+ }
+ });
+ },
+
+ before: function() {
+ if ( this[0] && this[0].parentNode ) {
+ return this.domManip(arguments, false, function( elem ) {
+ this.parentNode.insertBefore( elem, this );
+ });
+ } else if ( arguments.length ) {
+ var set = jQuery.clean( arguments );
+ set.push.apply( set, this.toArray() );
+ return this.pushStack( set, "before", arguments );
+ }
+ },
+
+ after: function() {
+ if ( this[0] && this[0].parentNode ) {
+ return this.domManip(arguments, false, function( elem ) {
+ this.parentNode.insertBefore( elem, this.nextSibling );
+ });
+ } else if ( arguments.length ) {
+ var set = this.pushStack( this, "after", arguments );
+ set.push.apply( set, jQuery.clean(arguments) );
+ return set;
+ }
+ },
+
+ // keepData is for internal use only--do not document
+ remove: function( selector, keepData ) {
+ for ( var i = 0, elem; (elem = this[i]) != null; i++ ) {
+ if ( !selector || jQuery.filter( selector, [ elem ] ).length ) {
+ if ( !keepData && elem.nodeType === 1 ) {
+ jQuery.cleanData( elem.getElementsByTagName("*") );
+ jQuery.cleanData( [ elem ] );
+ }
+
+ if ( elem.parentNode ) {
+ elem.parentNode.removeChild( elem );
+ }
+ }
+ }
+
+ return this;
+ },
+
+ empty: function() {
+ for ( var i = 0, elem; (elem = this[i]) != null; i++ ) {
+ // Remove element nodes and prevent memory leaks
+ if ( elem.nodeType === 1 ) {
+ jQuery.cleanData( elem.getElementsByTagName("*") );
+ }
+
+ // Remove any remaining nodes
+ while ( elem.firstChild ) {
+ elem.removeChild( elem.firstChild );
+ }
+ }
+
+ return this;
+ },
+
+ clone: function( dataAndEvents, deepDataAndEvents ) {
+ dataAndEvents = dataAndEvents == null ? false : dataAndEvents;
+ deepDataAndEvents = deepDataAndEvents == null ? dataAndEvents : deepDataAndEvents;
+
+ return this.map( function () {
+ return jQuery.clone( this, dataAndEvents, deepDataAndEvents );
+ });
+ },
+
+ html: function( value ) {
+ return jQuery.access( this, function( value ) {
+ var elem = this[0] || {},
+ i = 0,
+ l = this.length;
+
+ if ( value === undefined ) {
+ return elem.nodeType === 1 ?
+ elem.innerHTML.replace( rinlinejQuery, "" ) :
+ null;
+ }
+
+
+ if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
+ ( jQuery.support.leadingWhitespace || !rleadingWhitespace.test( value ) ) &&
+ !wrapMap[ ( rtagName.exec( value ) || ["", ""] )[1].toLowerCase() ] ) {
+
+ value = value.replace( rxhtmlTag, "<$1></$2>" );
+
+ try {
+ for (; i < l; i++ ) {
+ // Remove element nodes and prevent memory leaks
+ elem = this[i] || {};
+ if ( elem.nodeType === 1 ) {
+ jQuery.cleanData( elem.getElementsByTagName( "*" ) );
+ elem.innerHTML = value;
+ }
+ }
+
+ elem = 0;
+
+ // If using innerHTML throws an exception, use the fallback method
+ } catch(e) {}
+ }
+
+ if ( elem ) {
+ this.empty().append( value );
+ }
+ }, null, value, arguments.length );
+ },
+
+ replaceWith: function( value ) {
+ if ( this[0] && this[0].parentNode ) {
+ // Make sure that the elements are removed from the DOM before they are inserted
+ // this can help fix replacing a parent with child elements
+ if ( jQuery.isFunction( value ) ) {
+ return this.each(function(i) {
+ var self = jQuery(this), old = self.html();
+ self.replaceWith( value.call( this, i, old ) );
+ });
+ }
+
+ if ( typeof value !== "string" ) {
+ value = jQuery( value ).detach();
+ }
+
+ return this.each(function() {
+ var next = this.nextSibling,
+ parent = this.parentNode;
+
+ jQuery( this ).remove();
+
+ if ( next ) {
+ jQuery(next).before( value );
+ } else {
+ jQuery(parent).append( value );
+ }
+ });
+ } else {
+ return this.length ?
+ this.pushStack( jQuery(jQuery.isFunction(value) ? value() : value), "replaceWith", value ) :
+ this;
+ }
+ },
+
+ detach: function( selector ) {
+ return this.remove( selector, true );
+ },
+
+ domManip: function( args, table, callback ) {
+ var results, first, fragment, parent,
+ value = args[0],
+ scripts = [];
+
+ // We can't cloneNode fragments that contain checked, in WebKit
+ if ( !jQuery.support.checkClone && arguments.length === 3 && typeof value === "string" && rchecked.test( value ) ) {
+ return this.each(function() {
+ jQuery(this).domManip( args, table, callback, true );
+ });
+ }
+
+ if ( jQuery.isFunction(value) ) {
+ return this.each(function(i) {
+ var self = jQuery(this);
+ args[0] = value.call(this, i, table ? self.html() : undefined);
+ self.domManip( args, table, callback );
+ });
+ }
+
+ if ( this[0] ) {
+ parent = value && value.parentNode;
+
+ // If we're in a fragment, just use that instead of building a new one
+ if ( jQuery.support.parentNode && parent && parent.nodeType === 11 && parent.childNodes.length === this.length ) {
+ results = { fragment: parent };
+
+ } else {
+ results = jQuery.buildFragment( args, this, scripts );
+ }
+
+ fragment = results.fragment;
+
+ if ( fragment.childNodes.length === 1 ) {
+ first = fragment = fragment.firstChild;
+ } else {
+ first = fragment.firstChild;
+ }
+
+ if ( first ) {
+ table = table && jQuery.nodeName( first, "tr" );
+
+ for ( var i = 0, l = this.length, lastIndex = l - 1; i < l; i++ ) {
+ callback.call(
+ table ?
+ root(this[i], first) :
+ this[i],
+ // Make sure that we do not leak memory by inadvertently discarding
+ // the original fragment (which might have attached data) instead of
+ // using it; in addition, use the original fragment object for the last
+ // item instead of first because it can end up being emptied incorrectly
+ // in certain situations (Bug #8070).
+ // Fragments from the fragment cache must always be cloned and never used
+ // in place.
+ results.cacheable || ( l > 1 && i < lastIndex ) ?
+ jQuery.clone( fragment, true, true ) :
+ fragment
+ );
+ }
+ }
+
+ if ( scripts.length ) {
+ jQuery.each( scripts, function( i, elem ) {
+ if ( elem.src ) {
+ jQuery.ajax({
+ type: "GET",
+ global: false,
+ url: elem.src,
+ async: false,
+ dataType: "script"
+ });
+ } else {
+ jQuery.globalEval( ( elem.text || elem.textContent || elem.innerHTML || "" ).replace( rcleanScript, "/*$0*/" ) );
+ }
+
+ if ( elem.parentNode ) {
+ elem.parentNode.removeChild( elem );
+ }
+ });
+ }
+ }
+
+ return this;
+ }
+});
+
+function root( elem, cur ) {
+ return jQuery.nodeName(elem, "table") ?
+ (elem.getElementsByTagName("tbody")[0] ||
+ elem.appendChild(elem.ownerDocument.createElement("tbody"))) :
+ elem;
+}
+
+function cloneCopyEvent( src, dest ) {
+
+ if ( dest.nodeType !== 1 || !jQuery.hasData( src ) ) {
+ return;
+ }
+
+ var type, i, l,
+ oldData = jQuery._data( src ),
+ curData = jQuery._data( dest, oldData ),
+ events = oldData.events;
+
+ if ( events ) {
+ delete curData.handle;
+ curData.events = {};
+
+ for ( type in events ) {
+ for ( i = 0, l = events[ type ].length; i < l; i++ ) {
+ jQuery.event.add( dest, type, events[ type ][ i ] );
+ }
+ }
+ }
+
+ // make the cloned public data object a copy from the original
+ if ( curData.data ) {
+ curData.data = jQuery.extend( {}, curData.data );
+ }
+}
+
+function cloneFixAttributes( src, dest ) {
+ var nodeName;
+
+ // We do not need to do anything for non-Elements
+ if ( dest.nodeType !== 1 ) {
+ return;
+ }
+
+ // clearAttributes removes the attributes, which we don't want,
+ // but also removes the attachEvent events, which we *do* want
+ if ( dest.clearAttributes ) {
+ dest.clearAttributes();
+ }
+
+ // mergeAttributes, in contrast, only merges back on the
+ // original attributes, not the events
+ if ( dest.mergeAttributes ) {
+ dest.mergeAttributes( src );
+ }
+
+ nodeName = dest.nodeName.toLowerCase();
+
+ // IE6-8 fail to clone children inside object elements that use
+ // the proprietary classid attribute value (rather than the type
+ // attribute) to identify the type of content to display
+ if ( nodeName === "object" ) {
+ dest.outerHTML = src.outerHTML;
+
+ } else if ( nodeName === "input" && (src.type === "checkbox" || src.type === "radio") ) {
+ // IE6-8 fails to persist the checked state of a cloned checkbox
+ // or radio button. Worse, IE6-7 fail to give the cloned element
+ // a checked appearance if the defaultChecked value isn't also set
+ if ( src.checked ) {
+ dest.defaultChecked = dest.checked = src.checked;
+ }
+
+ // IE6-7 get confused and end up setting the value of a cloned
+ // checkbox/radio button to an empty string instead of "on"
+ if ( dest.value !== src.value ) {
+ dest.value = src.value;
+ }
+
+ // IE6-8 fails to return the selected option to the default selected
+ // state when cloning options
+ } else if ( nodeName === "option" ) {
+ dest.selected = src.defaultSelected;
+
+ // IE6-8 fails to set the defaultValue to the correct value when
+ // cloning other types of input fields
+ } else if ( nodeName === "input" || nodeName === "textarea" ) {
+ dest.defaultValue = src.defaultValue;
+
+ // IE blanks contents when cloning scripts
+ } else if ( nodeName === "script" && dest.text !== src.text ) {
+ dest.text = src.text;
+ }
+
+ // Event data gets referenced instead of copied if the expando
+ // gets copied too
+ dest.removeAttribute( jQuery.expando );
+
+ // Clear flags for bubbling special change/submit events, they must
+ // be reattached when the newly cloned events are first activated
+ dest.removeAttribute( "_submit_attached" );
+ dest.removeAttribute( "_change_attached" );
+}
+
+jQuery.buildFragment = function( args, nodes, scripts ) {
+ var fragment, cacheable, cacheresults, doc,
+ first = args[ 0 ];
+
+ // nodes may contain either an explicit document object,
+ // a jQuery collection or context object.
+ // If nodes[0] contains a valid object to assign to doc
+ if ( nodes && nodes[0] ) {
+ doc = nodes[0].ownerDocument || nodes[0];
+ }
+
+ // Ensure that an attr object doesn't incorrectly stand in as a document object
+ // Chrome and Firefox seem to allow this to occur and will throw exception
+ // Fixes #8950
+ if ( !doc.createDocumentFragment ) {
+ doc = document;
+ }
+
+ // Only cache "small" (1/2 KB) HTML strings that are associated with the main document
+ // Cloning options loses the selected state, so don't cache them
+ // IE 6 doesn't like it when you put <object> or <embed> elements in a fragment
+ // Also, WebKit does not clone 'checked' attributes on cloneNode, so don't cache
+ // Lastly, IE6,7,8 will not correctly reuse cached fragments that were created from unknown elems #10501
+ if ( args.length === 1 && typeof first === "string" && first.length < 512 && doc === document &&
+ first.charAt(0) === "<" && !rnocache.test( first ) &&
+ (jQuery.support.checkClone || !rchecked.test( first )) &&
+ (jQuery.support.html5Clone || !rnoshimcache.test( first )) ) {
+
+ cacheable = true;
+
+ cacheresults = jQuery.fragments[ first ];
+ if ( cacheresults && cacheresults !== 1 ) {
+ fragment = cacheresults;
+ }
+ }
+
+ if ( !fragment ) {
+ fragment = doc.createDocumentFragment();
+ jQuery.clean( args, doc, fragment, scripts );
+ }
+
+ if ( cacheable ) {
+ jQuery.fragments[ first ] = cacheresults ? fragment : 1;
+ }
+
+ return { fragment: fragment, cacheable: cacheable };
+};
+
+jQuery.fragments = {};
+
+jQuery.each({
+ appendTo: "append",
+ prependTo: "prepend",
+ insertBefore: "before",
+ insertAfter: "after",
+ replaceAll: "replaceWith"
+}, function( name, original ) {
+ jQuery.fn[ name ] = function( selector ) {
+ var ret = [],
+ insert = jQuery( selector ),
+ parent = this.length === 1 && this[0].parentNode;
+
+ if ( parent && parent.nodeType === 11 && parent.childNodes.length === 1 && insert.length === 1 ) {
+ insert[ original ]( this[0] );
+ return this;
+
+ } else {
+ for ( var i = 0, l = insert.length; i < l; i++ ) {
+ var elems = ( i > 0 ? this.clone(true) : this ).get();
+ jQuery( insert[i] )[ original ]( elems );
+ ret = ret.concat( elems );
+ }
+
+ return this.pushStack( ret, name, insert.selector );
+ }
+ };
+});
+
+function getAll( elem ) {
+ if ( typeof elem.getElementsByTagName !== "undefined" ) {
+ return elem.getElementsByTagName( "*" );
+
+ } else if ( typeof elem.querySelectorAll !== "undefined" ) {
+ return elem.querySelectorAll( "*" );
+
+ } else {
+ return [];
+ }
+}
+
+// Used in clean, fixes the defaultChecked property
+function fixDefaultChecked( elem ) {
+ if ( elem.type === "checkbox" || elem.type === "radio" ) {
+ elem.defaultChecked = elem.checked;
+ }
+}
+// Finds all inputs and passes them to fixDefaultChecked
+function findInputs( elem ) {
+ var nodeName = ( elem.nodeName || "" ).toLowerCase();
+ if ( nodeName === "input" ) {
+ fixDefaultChecked( elem );
+ // Skip scripts, get other children
+ } else if ( nodeName !== "script" && typeof elem.getElementsByTagName !== "undefined" ) {
+ jQuery.grep( elem.getElementsByTagName("input"), fixDefaultChecked );
+ }
+}
+
+// Derived From: http://www.iecss.com/shimprove/javascript/shimprove.1-0-1.js
+function shimCloneNode( elem ) {
+ var div = document.createElement( "div" );
+ safeFragment.appendChild( div );
+
+ div.innerHTML = elem.outerHTML;
+ return div.firstChild;
+}
+
+jQuery.extend({
+ clone: function( elem, dataAndEvents, deepDataAndEvents ) {
+ var srcElements,
+ destElements,
+ i,
+ // IE<=8 does not properly clone detached, unknown element nodes
+ clone = jQuery.support.html5Clone || jQuery.isXMLDoc(elem) || !rnoshimcache.test( "<" + elem.nodeName + ">" ) ?
+ elem.cloneNode( true ) :
+ shimCloneNode( elem );
+
+ if ( (!jQuery.support.noCloneEvent || !jQuery.support.noCloneChecked) &&
+ (elem.nodeType === 1 || elem.nodeType === 11) && !jQuery.isXMLDoc(elem) ) {
+ // IE copies events bound via attachEvent when using cloneNode.
+ // Calling detachEvent on the clone will also remove the events
+ // from the original. In order to get around this, we use some
+ // proprietary methods to clear the events. Thanks to MooTools
+ // guys for this hotness.
+
+ cloneFixAttributes( elem, clone );
+
+ // Using Sizzle here is crazy slow, so we use getElementsByTagName instead
+ srcElements = getAll( elem );
+ destElements = getAll( clone );
+
+ // Weird iteration because IE will replace the length property
+ // with an element if you are cloning the body and one of the
+ // elements on the page has a name or id of "length"
+ for ( i = 0; srcElements[i]; ++i ) {
+ // Ensure that the destination node is not null; Fixes #9587
+ if ( destElements[i] ) {
+ cloneFixAttributes( srcElements[i], destElements[i] );
+ }
+ }
+ }
+
+ // Copy the events from the original to the clone
+ if ( dataAndEvents ) {
+ cloneCopyEvent( elem, clone );
+
+ if ( deepDataAndEvents ) {
+ srcElements = getAll( elem );
+ destElements = getAll( clone );
+
+ for ( i = 0; srcElements[i]; ++i ) {
+ cloneCopyEvent( srcElements[i], destElements[i] );
+ }
+ }
+ }
+
+ srcElements = destElements = null;
+
+ // Return the cloned set
+ return clone;
+ },
+
+ clean: function( elems, context, fragment, scripts ) {
+ var checkScriptType, script, j,
+ ret = [];
+
+ context = context || document;
+
+ // !context.createElement fails in IE with an error but returns typeof 'object'
+ if ( typeof context.createElement === "undefined" ) {
+ context = context.ownerDocument || context[0] && context[0].ownerDocument || document;
+ }
+
+ for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
+ if ( typeof elem === "number" ) {
+ elem += "";
+ }
+
+ if ( !elem ) {
+ continue;
+ }
+
+ // Convert html string into DOM nodes
+ if ( typeof elem === "string" ) {
+ if ( !rhtml.test( elem ) ) {
+ elem = context.createTextNode( elem );
+ } else {
+ // Fix "XHTML"-style tags in all browsers
+ elem = elem.replace(rxhtmlTag, "<$1></$2>");
+
+ // Trim whitespace, otherwise indexOf won't work as expected
+ var tag = ( rtagName.exec( elem ) || ["", ""] )[1].toLowerCase(),
+ wrap = wrapMap[ tag ] || wrapMap._default,
+ depth = wrap[0],
+ div = context.createElement("div"),
+ safeChildNodes = safeFragment.childNodes,
+ remove;
+
+ // Append wrapper element to unknown element safe doc fragment
+ if ( context === document ) {
+ // Use the fragment we've already created for this document
+ safeFragment.appendChild( div );
+ } else {
+ // Use a fragment created with the owner document
+ createSafeFragment( context ).appendChild( div );
+ }
+
+ // Go to html and back, then peel off extra wrappers
+ div.innerHTML = wrap[1] + elem + wrap[2];
+
+ // Move to the right depth
+ while ( depth-- ) {
+ div = div.lastChild;
+ }
+
+ // Remove IE's autoinserted <tbody> from table fragments
+ if ( !jQuery.support.tbody ) {
+
+ // String was a <table>, *may* have spurious <tbody>
+ var hasBody = rtbody.test(elem),
+ tbody = tag === "table" && !hasBody ?
+ div.firstChild && div.firstChild.childNodes :
+
+ // String was a bare <thead> or <tfoot>
+ wrap[1] === "<table>" && !hasBody ?
+ div.childNodes :
+ [];
+
+ for ( j = tbody.length - 1; j >= 0 ; --j ) {
+ if ( jQuery.nodeName( tbody[ j ], "tbody" ) && !tbody[ j ].childNodes.length ) {
+ tbody[ j ].parentNode.removeChild( tbody[ j ] );
+ }
+ }
+ }
+
+ // IE completely kills leading whitespace when innerHTML is used
+ if ( !jQuery.support.leadingWhitespace && rleadingWhitespace.test( elem ) ) {
+ div.insertBefore( context.createTextNode( rleadingWhitespace.exec(elem)[0] ), div.firstChild );
+ }
+
+ elem = div.childNodes;
+
+ // Clear elements from DocumentFragment (safeFragment or otherwise)
+ // to avoid hoarding elements. Fixes #11356
+ if ( div ) {
+ div.parentNode.removeChild( div );
+
+ // Guard against -1 index exceptions in FF3.6
+ if ( safeChildNodes.length > 0 ) {
+ remove = safeChildNodes[ safeChildNodes.length - 1 ];
+
+ if ( remove && remove.parentNode ) {
+ remove.parentNode.removeChild( remove );
+ }
+ }
+ }
+ }
+ }
+
+ // Resets defaultChecked for any radios and checkboxes
+ // about to be appended to the DOM in IE 6/7 (#8060)
+ var len;
+ if ( !jQuery.support.appendChecked ) {
+ if ( elem[0] && typeof (len = elem.length) === "number" ) {
+ for ( j = 0; j < len; j++ ) {
+ findInputs( elem[j] );
+ }
+ } else {
+ findInputs( elem );
+ }
+ }
+
+ if ( elem.nodeType ) {
+ ret.push( elem );
+ } else {
+ ret = jQuery.merge( ret, elem );
+ }
+ }
+
+ if ( fragment ) {
+ checkScriptType = function( elem ) {
+ return !elem.type || rscriptType.test( elem.type );
+ };
+ for ( i = 0; ret[i]; i++ ) {
+ script = ret[i];
+ if ( scripts && jQuery.nodeName( script, "script" ) && (!script.type || rscriptType.test( script.type )) ) {
+ scripts.push( script.parentNode ? script.parentNode.removeChild( script ) : script );
+
+ } else {
+ if ( script.nodeType === 1 ) {
+ var jsTags = jQuery.grep( script.getElementsByTagName( "script" ), checkScriptType );
+
+ ret.splice.apply( ret, [i + 1, 0].concat( jsTags ) );
+ }
+ fragment.appendChild( script );
+ }
+ }
+ }
+
+ return ret;
+ },
+
+ cleanData: function( elems ) {
+ var data, id,
+ cache = jQuery.cache,
+ special = jQuery.event.special,
+ deleteExpando = jQuery.support.deleteExpando;
+
+ for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
+ if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
+ continue;
+ }
+
+ id = elem[ jQuery.expando ];
+
+ if ( id ) {
+ data = cache[ id ];
+
+ if ( data && data.events ) {
+ for ( var type in data.events ) {
+ if ( special[ type ] ) {
+ jQuery.event.remove( elem, type );
+
+ // This is a shortcut to avoid jQuery.event.remove's overhead
+ } else {
+ jQuery.removeEvent( elem, type, data.handle );
+ }
+ }
+
+ // Null the DOM reference to avoid IE6/7/8 leak (#7054)
+ if ( data.handle ) {
+ data.handle.elem = null;
+ }
+ }
+
+ if ( deleteExpando ) {
+ delete elem[ jQuery.expando ];
+
+ } else if ( elem.removeAttribute ) {
+ elem.removeAttribute( jQuery.expando );
+ }
+
+ delete cache[ id ];
+ }
+ }
+ }
+});
+
+
+
+
+var ralpha = /alpha\([^)]*\)/i,
+ ropacity = /opacity=([^)]*)/,
+ // fixed for IE9, see #8346
+ rupper = /([A-Z]|^ms)/g,
+ rnum = /^[\-+]?(?:\d*\.)?\d+$/i,
+ rnumnonpx = /^-?(?:\d*\.)?\d+(?!px)[^\d\s]+$/i,
+ rrelNum = /^([\-+])=([\-+.\de]+)/,
+ rmargin = /^margin/,
+
+ cssShow = { position: "absolute", visibility: "hidden", display: "block" },
+
+ // order is important!
+ cssExpand = [ "Top", "Right", "Bottom", "Left" ],
+
+ curCSS,
+
+ getComputedStyle,
+ currentStyle;
+
+jQuery.fn.css = function( name, value ) {
+ return jQuery.access( this, function( elem, name, value ) {
+ return value !== undefined ?
+ jQuery.style( elem, name, value ) :
+ jQuery.css( elem, name );
+ }, name, value, arguments.length > 1 );
+};
+
+jQuery.extend({
+ // Add in style property hooks for overriding the default
+ // behavior of getting and setting a style property
+ cssHooks: {
+ opacity: {
+ get: function( elem, computed ) {
+ if ( computed ) {
+ // We should always get a number back from opacity
+ var ret = curCSS( elem, "opacity" );
+ return ret === "" ? "1" : ret;
+
+ } else {
+ return elem.style.opacity;
+ }
+ }
+ }
+ },
+
+ // Exclude the following css properties to add px
+ cssNumber: {
+ "fillOpacity": true,
+ "fontWeight": true,
+ "lineHeight": true,
+ "opacity": true,
+ "orphans": true,
+ "widows": true,
+ "zIndex": true,
+ "zoom": true
+ },
+
+ // Add in properties whose names you wish to fix before
+ // setting or getting the value
+ cssProps: {
+ // normalize float css property
+ "float": jQuery.support.cssFloat ? "cssFloat" : "styleFloat"
+ },
+
+ // Get and set the style property on a DOM Node
+ style: function( elem, name, value, extra ) {
+ // Don't set styles on text and comment nodes
+ if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
+ return;
+ }
+
+ // Make sure that we're working with the right name
+ var ret, type, origName = jQuery.camelCase( name ),
+ style = elem.style, hooks = jQuery.cssHooks[ origName ];
+
+ name = jQuery.cssProps[ origName ] || origName;
+
+ // Check if we're setting a value
+ if ( value !== undefined ) {
+ type = typeof value;
+
+ // convert relative number strings (+= or -=) to relative numbers. #7345
+ if ( type === "string" && (ret = rrelNum.exec( value )) ) {
+ value = ( +( ret[1] + 1) * +ret[2] ) + parseFloat( jQuery.css( elem, name ) );
+ // Fixes bug #9237
+ type = "number";
+ }
+
+ // Make sure that NaN and null values aren't set. See: #7116
+ if ( value == null || type === "number" && isNaN( value ) ) {
+ return;
+ }
+
+ // If a number was passed in, add 'px' to the (except for certain CSS properties)
+ if ( type === "number" && !jQuery.cssNumber[ origName ] ) {
+ value += "px";
+ }
+
+ // If a hook was provided, use that value, otherwise just set the specified value
+ if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value )) !== undefined ) {
+ // Wrapped to prevent IE from throwing errors when 'invalid' values are provided
+ // Fixes bug #5509
+ try {
+ style[ name ] = value;
+ } catch(e) {}
+ }
+
+ } else {
+ // If a hook was provided get the non-computed value from there
+ if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
+ return ret;
+ }
+
+ // Otherwise just get the value from the style object
+ return style[ name ];
+ }
+ },
+
+ css: function( elem, name, extra ) {
+ var ret, hooks;
+
+ // Make sure that we're working with the right name
+ name = jQuery.camelCase( name );
+ hooks = jQuery.cssHooks[ name ];
+ name = jQuery.cssProps[ name ] || name;
+
+ // cssFloat needs a special treatment
+ if ( name === "cssFloat" ) {
+ name = "float";
+ }
+
+ // If a hook was provided get the computed value from there
+ if ( hooks && "get" in hooks && (ret = hooks.get( elem, true, extra )) !== undefined ) {
+ return ret;
+
+ // Otherwise, if a way to get the computed value exists, use that
+ } else if ( curCSS ) {
+ return curCSS( elem, name );
+ }
+ },
+
+ // A method for quickly swapping in/out CSS properties to get correct calculations
+ swap: function( elem, options, callback ) {
+ var old = {},
+ ret, name;
+
+ // Remember the old values, and insert the new ones
+ for ( name in options ) {
+ old[ name ] = elem.style[ name ];
+ elem.style[ name ] = options[ name ];
+ }
+
+ ret = callback.call( elem );
+
+ // Revert the old values
+ for ( name in options ) {
+ elem.style[ name ] = old[ name ];
+ }
+
+ return ret;
+ }
+});
+
+// DEPRECATED in 1.3, Use jQuery.css() instead
+jQuery.curCSS = jQuery.css;
+
+if ( document.defaultView && document.defaultView.getComputedStyle ) {
+ getComputedStyle = function( elem, name ) {
+ var ret, defaultView, computedStyle, width,
+ style = elem.style;
+
+ name = name.replace( rupper, "-$1" ).toLowerCase();
+
+ if ( (defaultView = elem.ownerDocument.defaultView) &&
+ (computedStyle = defaultView.getComputedStyle( elem, null )) ) {
+
+ ret = computedStyle.getPropertyValue( name );
+ if ( ret === "" && !jQuery.contains( elem.ownerDocument.documentElement, elem ) ) {
+ ret = jQuery.style( elem, name );
+ }
+ }
+
+ // A tribute to the "awesome hack by Dean Edwards"
+ // WebKit uses "computed value (percentage if specified)" instead of "used value" for margins
+ // which is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values
+ if ( !jQuery.support.pixelMargin && computedStyle && rmargin.test( name ) && rnumnonpx.test( ret ) ) {
+ width = style.width;
+ style.width = ret;
+ ret = computedStyle.width;
+ style.width = width;
+ }
+
+ return ret;
+ };
+}
+
+if ( document.documentElement.currentStyle ) {
+ currentStyle = function( elem, name ) {
+ var left, rsLeft, uncomputed,
+ ret = elem.currentStyle && elem.currentStyle[ name ],
+ style = elem.style;
+
+ // Avoid setting ret to empty string here
+ // so we don't default to auto
+ if ( ret == null && style && (uncomputed = style[ name ]) ) {
+ ret = uncomputed;
+ }
+
+ // From the awesome hack by Dean Edwards
+ // http://erik.eae.net/archives/2007/07/27/18.54.15/#comment-102291
+
+ // If we're not dealing with a regular pixel number
+ // but a number that has a weird ending, we need to convert it to pixels
+ if ( rnumnonpx.test( ret ) ) {
+
+ // Remember the original values
+ left = style.left;
+ rsLeft = elem.runtimeStyle && elem.runtimeStyle.left;
+
+ // Put in the new values to get a computed value out
+ if ( rsLeft ) {
+ elem.runtimeStyle.left = elem.currentStyle.left;
+ }
+ style.left = name === "fontSize" ? "1em" : ret;
+ ret = style.pixelLeft + "px";
+
+ // Revert the changed values
+ style.left = left;
+ if ( rsLeft ) {
+ elem.runtimeStyle.left = rsLeft;
+ }
+ }
+
+ return ret === "" ? "auto" : ret;
+ };
+}
+
+curCSS = getComputedStyle || currentStyle;
+
+function getWidthOrHeight( elem, name, extra ) {
+
+ // Start with offset property
+ var val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
+ i = name === "width" ? 1 : 0,
+ len = 4;
+
+ if ( val > 0 ) {
+ if ( extra !== "border" ) {
+ for ( ; i < len; i += 2 ) {
+ if ( !extra ) {
+ val -= parseFloat( jQuery.css( elem, "padding" + cssExpand[ i ] ) ) || 0;
+ }
+ if ( extra === "margin" ) {
+ val += parseFloat( jQuery.css( elem, extra + cssExpand[ i ] ) ) || 0;
+ } else {
+ val -= parseFloat( jQuery.css( elem, "border" + cssExpand[ i ] + "Width" ) ) || 0;
+ }
+ }
+ }
+
+ return val + "px";
+ }
+
+ // Fall back to computed then uncomputed css if necessary
+ val = curCSS( elem, name );
+ if ( val < 0 || val == null ) {
+ val = elem.style[ name ];
+ }
+
+ // Computed unit is not pixels. Stop here and return.
+ if ( rnumnonpx.test(val) ) {
+ return val;
+ }
+
+ // Normalize "", auto, and prepare for extra
+ val = parseFloat( val ) || 0;
+
+ // Add padding, border, margin
+ if ( extra ) {
+ for ( ; i < len; i += 2 ) {
+ val += parseFloat( jQuery.css( elem, "padding" + cssExpand[ i ] ) ) || 0;
+ if ( extra !== "padding" ) {
+ val += parseFloat( jQuery.css( elem, "border" + cssExpand[ i ] + "Width" ) ) || 0;
+ }
+ if ( extra === "margin" ) {
+ val += parseFloat( jQuery.css( elem, extra + cssExpand[ i ]) ) || 0;
+ }
+ }
+ }
+
+ return val + "px";
+}
+
+jQuery.each([ "height", "width" ], function( i, name ) {
+ jQuery.cssHooks[ name ] = {
+ get: function( elem, computed, extra ) {
+ if ( computed ) {
+ if ( elem.offsetWidth !== 0 ) {
+ return getWidthOrHeight( elem, name, extra );
+ } else {
+ return jQuery.swap( elem, cssShow, function() {
+ return getWidthOrHeight( elem, name, extra );
+ });
+ }
+ }
+ },
+
+ set: function( elem, value ) {
+ return rnum.test( value ) ?
+ value + "px" :
+ value;
+ }
+ };
+});
+
+if ( !jQuery.support.opacity ) {
+ jQuery.cssHooks.opacity = {
+ get: function( elem, computed ) {
+ // IE uses filters for opacity
+ return ropacity.test( (computed && elem.currentStyle ? elem.currentStyle.filter : elem.style.filter) || "" ) ?
+ ( parseFloat( RegExp.$1 ) / 100 ) + "" :
+ computed ? "1" : "";
+ },
+
+ set: function( elem, value ) {
+ var style = elem.style,
+ currentStyle = elem.currentStyle,
+ opacity = jQuery.isNumeric( value ) ? "alpha(opacity=" + value * 100 + ")" : "",
+ filter = currentStyle && currentStyle.filter || style.filter || "";
+
+ // IE has trouble with opacity if it does not have layout
+ // Force it by setting the zoom level
+ style.zoom = 1;
+
+ // if setting opacity to 1, and no other filters exist - attempt to remove filter attribute #6652
+ if ( value >= 1 && jQuery.trim( filter.replace( ralpha, "" ) ) === "" ) {
+
+ // Setting style.filter to null, "" & " " still leave "filter:" in the cssText
+ // if "filter:" is present at all, clearType is disabled, we want to avoid this
+ // style.removeAttribute is IE Only, but so apparently is this code path...
+ style.removeAttribute( "filter" );
+
+ // if there there is no filter style applied in a css rule, we are done
+ if ( currentStyle && !currentStyle.filter ) {
+ return;
+ }
+ }
+
+ // otherwise, set new filter values
+ style.filter = ralpha.test( filter ) ?
+ filter.replace( ralpha, opacity ) :
+ filter + " " + opacity;
+ }
+ };
+}
+
+jQuery(function() {
+ // This hook cannot be added until DOM ready because the support test
+ // for it is not run until after DOM ready
+ if ( !jQuery.support.reliableMarginRight ) {
+ jQuery.cssHooks.marginRight = {
+ get: function( elem, computed ) {
+ // WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
+ // Work around by temporarily setting element display to inline-block
+ return jQuery.swap( elem, { "display": "inline-block" }, function() {
+ if ( computed ) {
+ return curCSS( elem, "margin-right" );
+ } else {
+ return elem.style.marginRight;
+ }
+ });
+ }
+ };
+ }
+});
+
+if ( jQuery.expr && jQuery.expr.filters ) {
+ jQuery.expr.filters.hidden = function( elem ) {
+ var width = elem.offsetWidth,
+ height = elem.offsetHeight;
+
+ return ( width === 0 && height === 0 ) || (!jQuery.support.reliableHiddenOffsets && ((elem.style && elem.style.display) || jQuery.css( elem, "display" )) === "none");
+ };
+
+ jQuery.expr.filters.visible = function( elem ) {
+ return !jQuery.expr.filters.hidden( elem );
+ };
+}
+
+// These hooks are used by animate to expand properties
+jQuery.each({
+ margin: "",
+ padding: "",
+ border: "Width"
+}, function( prefix, suffix ) {
+
+ jQuery.cssHooks[ prefix + suffix ] = {
+ expand: function( value ) {
+ var i,
+
+ // assumes a single number if not a string
+ parts = typeof value === "string" ? value.split(" ") : [ value ],
+ expanded = {};
+
+ for ( i = 0; i < 4; i++ ) {
+ expanded[ prefix + cssExpand[ i ] + suffix ] =
+ parts[ i ] || parts[ i - 2 ] || parts[ 0 ];
+ }
+
+ return expanded;
+ }
+ };
+});
+
+
+
+
+var r20 = /%20/g,
+ rbracket = /\[\]$/,
+ rCRLF = /\r?\n/g,
+ rhash = /#.*$/,
+ rheaders = /^(.*?):[ \t]*([^\r\n]*)\r?$/mg, // IE leaves an \r character at EOL
+ rinput = /^(?:color|date|datetime|datetime-local|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
+ // #7653, #8125, #8152: local protocol detection
+ rlocalProtocol = /^(?:about|app|app\-storage|.+\-extension|file|res|widget):$/,
+ rnoContent = /^(?:GET|HEAD)$/,
+ rprotocol = /^\/\//,
+ rquery = /\?/,
+ rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
+ rselectTextarea = /^(?:select|textarea)/i,
+ rspacesAjax = /\s+/,
+ rts = /([?&])_=[^&]*/,
+ rurl = /^([\w\+\.\-]+:)(?:\/\/([^\/?#:]*)(?::(\d+))?)?/,
+
+ // Keep a copy of the old load method
+ _load = jQuery.fn.load,
+
+ /* Prefilters
+ * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
+ * 2) These are called:
+ * - BEFORE asking for a transport
+ * - AFTER param serialization (s.data is a string if s.processData is true)
+ * 3) key is the dataType
+ * 4) the catchall symbol "*" can be used
+ * 5) execution will start with transport dataType and THEN continue down to "*" if needed
+ */
+ prefilters = {},
+
+ /* Transports bindings
+ * 1) key is the dataType
+ * 2) the catchall symbol "*" can be used
+ * 3) selection will start with transport dataType and THEN go to "*" if needed
+ */
+ transports = {},
+
+ // Document location
+ ajaxLocation,
+
+ // Document location segments
+ ajaxLocParts,
+
+ // Avoid comment-prolog char sequence (#10098); must appease lint and evade compression
+ allTypes = ["*/"] + ["*"];
+
+// #8138, IE may throw an exception when accessing
+// a field from window.location if document.domain has been set
+try {
+ ajaxLocation = location.href;
+} catch( e ) {
+ // Use the href attribute of an A element
+ // since IE will modify it given document.location
+ ajaxLocation = document.createElement( "a" );
+ ajaxLocation.href = "";
+ ajaxLocation = ajaxLocation.href;
+}
+
+// Segment location into parts
+ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];
+
+// Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
+function addToPrefiltersOrTransports( structure ) {
+
+ // dataTypeExpression is optional and defaults to "*"
+ return function( dataTypeExpression, func ) {
+
+ if ( typeof dataTypeExpression !== "string" ) {
+ func = dataTypeExpression;
+ dataTypeExpression = "*";
+ }
+
+ if ( jQuery.isFunction( func ) ) {
+ var dataTypes = dataTypeExpression.toLowerCase().split( rspacesAjax ),
+ i = 0,
+ length = dataTypes.length,
+ dataType,
+ list,
+ placeBefore;
+
+ // For each dataType in the dataTypeExpression
+ for ( ; i < length; i++ ) {
+ dataType = dataTypes[ i ];
+ // We control if we're asked to add before
+ // any existing element
+ placeBefore = /^\+/.test( dataType );
+ if ( placeBefore ) {
+ dataType = dataType.substr( 1 ) || "*";
+ }
+ list = structure[ dataType ] = structure[ dataType ] || [];
+ // then we add to the structure accordingly
+ list[ placeBefore ? "unshift" : "push" ]( func );
+ }
+ }
+ };
+}
+
+// Base inspection function for prefilters and transports
+function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR,
+ dataType /* internal */, inspected /* internal */ ) {
+
+ dataType = dataType || options.dataTypes[ 0 ];
+ inspected = inspected || {};
+
+ inspected[ dataType ] = true;
+
+ var list = structure[ dataType ],
+ i = 0,
+ length = list ? list.length : 0,
+ executeOnly = ( structure === prefilters ),
+ selection;
+
+ for ( ; i < length && ( executeOnly || !selection ); i++ ) {
+ selection = list[ i ]( options, originalOptions, jqXHR );
+ // If we got redirected to another dataType
+ // we try there if executing only and not done already
+ if ( typeof selection === "string" ) {
+ if ( !executeOnly || inspected[ selection ] ) {
+ selection = undefined;
+ } else {
+ options.dataTypes.unshift( selection );
+ selection = inspectPrefiltersOrTransports(
+ structure, options, originalOptions, jqXHR, selection, inspected );
+ }
+ }
+ }
+ // If we're only executing or nothing was selected
+ // we try the catchall dataType if not done already
+ if ( ( executeOnly || !selection ) && !inspected[ "*" ] ) {
+ selection = inspectPrefiltersOrTransports(
+ structure, options, originalOptions, jqXHR, "*", inspected );
+ }
+ // unnecessary when only executing (prefilters)
+ // but it'll be ignored by the caller in that case
+ return selection;
+}
+
+// A special extend for ajax options
+// that takes "flat" options (not to be deep extended)
+// Fixes #9887
+function ajaxExtend( target, src ) {
+ var key, deep,
+ flatOptions = jQuery.ajaxSettings.flatOptions || {};
+ for ( key in src ) {
+ if ( src[ key ] !== undefined ) {
+ ( flatOptions[ key ] ? target : ( deep || ( deep = {} ) ) )[ key ] = src[ key ];
+ }
+ }
+ if ( deep ) {
+ jQuery.extend( true, target, deep );
+ }
+}
+
+jQuery.fn.extend({
+ load: function( url, params, callback ) {
+ if ( typeof url !== "string" && _load ) {
+ return _load.apply( this, arguments );
+
+ // Don't do a request if no elements are being requested
+ } else if ( !this.length ) {
+ return this;
+ }
+
+ var off = url.indexOf( " " );
+ if ( off >= 0 ) {
+ var selector = url.slice( off, url.length );
+ url = url.slice( 0, off );
+ }
+
+ // Default to a GET request
+ var type = "GET";
+
+ // If the second parameter was provided
+ if ( params ) {
+ // If it's a function
+ if ( jQuery.isFunction( params ) ) {
+ // We assume that it's the callback
+ callback = params;
+ params = undefined;
+
+ // Otherwise, build a param string
+ } else if ( typeof params === "object" ) {
+ params = jQuery.param( params, jQuery.ajaxSettings.traditional );
+ type = "POST";
+ }
+ }
+
+ var self = this;
+
+ // Request the remote document
+ jQuery.ajax({
+ url: url,
+ type: type,
+ dataType: "html",
+ data: params,
+ // Complete callback (responseText is used internally)
+ complete: function( jqXHR, status, responseText ) {
+ // Store the response as specified by the jqXHR object
+ responseText = jqXHR.responseText;
+ // If successful, inject the HTML into all the matched elements
+ if ( jqXHR.isResolved() ) {
+ // #4825: Get the actual response in case
+ // a dataFilter is present in ajaxSettings
+ jqXHR.done(function( r ) {
+ responseText = r;
+ });
+ // See if a selector was specified
+ self.html( selector ?
+ // Create a dummy div to hold the results
+ jQuery("<div>")
+ // inject the contents of the document in, removing the scripts
+ // to avoid any 'Permission Denied' errors in IE
+ .append(responseText.replace(rscript, ""))
+
+ // Locate the specified elements
+ .find(selector) :
+
+ // If not, just inject the full result
+ responseText );
+ }
+
+ if ( callback ) {
+ self.each( callback, [ responseText, status, jqXHR ] );
+ }
+ }
+ });
+
+ return this;
+ },
+
+ serialize: function() {
+ return jQuery.param( this.serializeArray() );
+ },
+
+ serializeArray: function() {
+ return this.map(function(){
+ return this.elements ? jQuery.makeArray( this.elements ) : this;
+ })
+ .filter(function(){
+ return this.name && !this.disabled &&
+ ( this.checked || rselectTextarea.test( this.nodeName ) ||
+ rinput.test( this.type ) );
+ })
+ .map(function( i, elem ){
+ var val = jQuery( this ).val();
+
+ return val == null ?
+ null :
+ jQuery.isArray( val ) ?
+ jQuery.map( val, function( val, i ){
+ return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
+ }) :
+ { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
+ }).get();
+ }
+});
+
+// Attach a bunch of functions for handling common AJAX events
+jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split( " " ), function( i, o ){
+ jQuery.fn[ o ] = function( f ){
+ return this.on( o, f );
+ };
+});
+
+jQuery.each( [ "get", "post" ], function( i, method ) {
+ jQuery[ method ] = function( url, data, callback, type ) {
+ // shift arguments if data argument was omitted
+ if ( jQuery.isFunction( data ) ) {
+ type = type || callback;
+ callback = data;
+ data = undefined;
+ }
+
+ return jQuery.ajax({
+ type: method,
+ url: url,
+ data: data,
+ success: callback,
+ dataType: type
+ });
+ };
+});
+
+jQuery.extend({
+
+ getScript: function( url, callback ) {
+ return jQuery.get( url, undefined, callback, "script" );
+ },
+
+ getJSON: function( url, data, callback ) {
+ return jQuery.get( url, data, callback, "json" );
+ },
+
+ // Creates a full fledged settings object into target
+ // with both ajaxSettings and settings fields.
+ // If target is omitted, writes into ajaxSettings.
+ ajaxSetup: function( target, settings ) {
+ if ( settings ) {
+ // Building a settings object
+ ajaxExtend( target, jQuery.ajaxSettings );
+ } else {
+ // Extending ajaxSettings
+ settings = target;
+ target = jQuery.ajaxSettings;
+ }
+ ajaxExtend( target, settings );
+ return target;
+ },
+
+ ajaxSettings: {
+ url: ajaxLocation,
+ isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
+ global: true,
+ type: "GET",
+ contentType: "application/x-www-form-urlencoded; charset=UTF-8",
+ processData: true,
+ async: true,
+ /*
+ timeout: 0,
+ data: null,
+ dataType: null,
+ username: null,
+ password: null,
+ cache: null,
+ traditional: false,
+ headers: {},
+ */
+
+ accepts: {
+ xml: "application/xml, text/xml",
+ html: "text/html",
+ text: "text/plain",
+ json: "application/json, text/javascript",
+ "*": allTypes
+ },
+
+ contents: {
+ xml: /xml/,
+ html: /html/,
+ json: /json/
+ },
+
+ responseFields: {
+ xml: "responseXML",
+ text: "responseText"
+ },
+
+ // List of data converters
+ // 1) key format is "source_type destination_type" (a single space in-between)
+ // 2) the catchall symbol "*" can be used for source_type
+ converters: {
+
+ // Convert anything to text
+ "* text": window.String,
+
+ // Text to html (true = no transformation)
+ "text html": true,
+
+ // Evaluate text as a json expression
+ "text json": jQuery.parseJSON,
+
+ // Parse text as xml
+ "text xml": jQuery.parseXML
+ },
+
+ // For options that shouldn't be deep extended:
+ // you can add your own custom options here if
+ // and when you create one that shouldn't be
+ // deep extended (see ajaxExtend)
+ flatOptions: {
+ context: true,
+ url: true
+ }
+ },
+
+ ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
+ ajaxTransport: addToPrefiltersOrTransports( transports ),
+
+ // Main method
+ ajax: function( url, options ) {
+
+ // If url is an object, simulate pre-1.5 signature
+ if ( typeof url === "object" ) {
+ options = url;
+ url = undefined;
+ }
+
+ // Force options to be an object
+ options = options || {};
+
+ var // Create the final options object
+ s = jQuery.ajaxSetup( {}, options ),
+ // Callbacks context
+ callbackContext = s.context || s,
+ // Context for global events
+ // It's the callbackContext if one was provided in the options
+ // and if it's a DOM node or a jQuery collection
+ globalEventContext = callbackContext !== s &&
+ ( callbackContext.nodeType || callbackContext instanceof jQuery ) ?
+ jQuery( callbackContext ) : jQuery.event,
+ // Deferreds
+ deferred = jQuery.Deferred(),
+ completeDeferred = jQuery.Callbacks( "once memory" ),
+ // Status-dependent callbacks
+ statusCode = s.statusCode || {},
+ // ifModified key
+ ifModifiedKey,
+ // Headers (they are sent all at once)
+ requestHeaders = {},
+ requestHeadersNames = {},
+ // Response headers
+ responseHeadersString,
+ responseHeaders,
+ // transport
+ transport,
+ // timeout handle
+ timeoutTimer,
+ // Cross-domain detection vars
+ parts,
+ // The jqXHR state
+ state = 0,
+ // To know if global events are to be dispatched
+ fireGlobals,
+ // Loop variable
+ i,
+ // Fake xhr
+ jqXHR = {
+
+ readyState: 0,
+
+ // Caches the header
+ setRequestHeader: function( name, value ) {
+ if ( !state ) {
+ var lname = name.toLowerCase();
+ name = requestHeadersNames[ lname ] = requestHeadersNames[ lname ] || name;
+ requestHeaders[ name ] = value;
+ }
+ return this;
+ },
+
+ // Raw string
+ getAllResponseHeaders: function() {
+ return state === 2 ? responseHeadersString : null;
+ },
+
+ // Builds headers hashtable if needed
+ getResponseHeader: function( key ) {
+ var match;
+ if ( state === 2 ) {
+ if ( !responseHeaders ) {
+ responseHeaders = {};
+ while( ( match = rheaders.exec( responseHeadersString ) ) ) {
+ responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
+ }
+ }
+ match = responseHeaders[ key.toLowerCase() ];
+ }
+ return match === undefined ? null : match;
+ },
+
+ // Overrides response content-type header
+ overrideMimeType: function( type ) {
+ if ( !state ) {
+ s.mimeType = type;
+ }
+ return this;
+ },
+
+ // Cancel the request
+ abort: function( statusText ) {
+ statusText = statusText || "abort";
+ if ( transport ) {
+ transport.abort( statusText );
+ }
+ done( 0, statusText );
+ return this;
+ }
+ };
+
+ // Callback for when everything is done
+ // It is defined here because jslint complains if it is declared
+ // at the end of the function (which would be more logical and readable)
+ function done( status, nativeStatusText, responses, headers ) {
+
+ // Called once
+ if ( state === 2 ) {
+ return;
+ }
+
+ // State is "done" now
+ state = 2;
+
+ // Clear timeout if it exists
+ if ( timeoutTimer ) {
+ clearTimeout( timeoutTimer );
+ }
+
+ // Dereference transport for early garbage collection
+ // (no matter how long the jqXHR object will be used)
+ transport = undefined;
+
+ // Cache response headers
+ responseHeadersString = headers || "";
+
+ // Set readyState
+ jqXHR.readyState = status > 0 ? 4 : 0;
+
+ var isSuccess,
+ success,
+ error,
+ statusText = nativeStatusText,
+ response = responses ? ajaxHandleResponses( s, jqXHR, responses ) : undefined,
+ lastModified,
+ etag;
+
+ // If successful, handle type chaining
+ if ( status >= 200 && status < 300 || status === 304 ) {
+
+ // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+ if ( s.ifModified ) {
+
+ if ( ( lastModified = jqXHR.getResponseHeader( "Last-Modified" ) ) ) {
+ jQuery.lastModified[ ifModifiedKey ] = lastModified;
+ }
+ if ( ( etag = jqXHR.getResponseHeader( "Etag" ) ) ) {
+ jQuery.etag[ ifModifiedKey ] = etag;
+ }
+ }
+
+ // If not modified
+ if ( status === 304 ) {
+
+ statusText = "notmodified";
+ isSuccess = true;
+
+ // If we have data
+ } else {
+
+ try {
+ success = ajaxConvert( s, response );
+ statusText = "success";
+ isSuccess = true;
+ } catch(e) {
+ // We have a parsererror
+ statusText = "parsererror";
+ error = e;
+ }
+ }
+ } else {
+ // We extract error from statusText
+ // then normalize statusText and status for non-aborts
+ error = statusText;
+ if ( !statusText || status ) {
+ statusText = "error";
+ if ( status < 0 ) {
+ status = 0;
+ }
+ }
+ }
+
+ // Set data for the fake xhr object
+ jqXHR.status = status;
+ jqXHR.statusText = "" + ( nativeStatusText || statusText );
+
+ // Success/Error
+ if ( isSuccess ) {
+ deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
+ } else {
+ deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
+ }
+
+ // Status-dependent callbacks
+ jqXHR.statusCode( statusCode );
+ statusCode = undefined;
+
+ if ( fireGlobals ) {
+ globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ),
+ [ jqXHR, s, isSuccess ? success : error ] );
+ }
+
+ // Complete
+ completeDeferred.fireWith( callbackContext, [ jqXHR, statusText ] );
+
+ if ( fireGlobals ) {
+ globalEventContext.trigger( "ajaxComplete", [ jqXHR, s ] );
+ // Handle the global AJAX counter
+ if ( !( --jQuery.active ) ) {
+ jQuery.event.trigger( "ajaxStop" );
+ }
+ }
+ }
+
+ // Attach deferreds
+ deferred.promise( jqXHR );
+ jqXHR.success = jqXHR.done;
+ jqXHR.error = jqXHR.fail;
+ jqXHR.complete = completeDeferred.add;
+
+ // Status-dependent callbacks
+ jqXHR.statusCode = function( map ) {
+ if ( map ) {
+ var tmp;
+ if ( state < 2 ) {
+ for ( tmp in map ) {
+ statusCode[ tmp ] = [ statusCode[tmp], map[tmp] ];
+ }
+ } else {
+ tmp = map[ jqXHR.status ];
+ jqXHR.then( tmp, tmp );
+ }
+ }
+ return this;
+ };
+
+ // Remove hash character (#7531: and string promotion)
+ // Add protocol if not provided (#5866: IE7 issue with protocol-less urls)
+ // We also use the url parameter if available
+ s.url = ( ( url || s.url ) + "" ).replace( rhash, "" ).replace( rprotocol, ajaxLocParts[ 1 ] + "//" );
+
+ // Extract dataTypes list
+ s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
+
+ // Determine if a cross-domain request is in order
+ if ( s.crossDomain == null ) {
+ parts = rurl.exec( s.url.toLowerCase() );
+ s.crossDomain = !!( parts &&
+ ( parts[ 1 ] != ajaxLocParts[ 1 ] || parts[ 2 ] != ajaxLocParts[ 2 ] ||
+ ( parts[ 3 ] || ( parts[ 1 ] === "http:" ? 80 : 443 ) ) !=
+ ( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? 80 : 443 ) ) )
+ );
+ }
+
+ // Convert data if not already a string
+ if ( s.data && s.processData && typeof s.data !== "string" ) {
+ s.data = jQuery.param( s.data, s.traditional );
+ }
+
+ // Apply prefilters
+ inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );
+
+ // If request was aborted inside a prefilter, stop there
+ if ( state === 2 ) {
+ return false;
+ }
+
+ // We can fire global events as of now if asked to
+ fireGlobals = s.global;
+
+ // Uppercase the type
+ s.type = s.type.toUpperCase();
+
+ // Determine if request has content
+ s.hasContent = !rnoContent.test( s.type );
+
+ // Watch for a new set of requests
+ if ( fireGlobals && jQuery.active++ === 0 ) {
+ jQuery.event.trigger( "ajaxStart" );
+ }
+
+ // More options handling for requests with no content
+ if ( !s.hasContent ) {
+
+ // If data is available, append data to url
+ if ( s.data ) {
+ s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
+ // #9682: remove data so that it's not used in an eventual retry
+ delete s.data;
+ }
+
+ // Get ifModifiedKey before adding the anti-cache parameter
+ ifModifiedKey = s.url;
+
+ // Add anti-cache in url if needed
+ if ( s.cache === false ) {
+
+ var ts = jQuery.now(),
+ // try replacing _= if it is there
+ ret = s.url.replace( rts, "$1_=" + ts );
+
+ // if nothing was replaced, add timestamp to the end
+ s.url = ret + ( ( ret === s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "" );
+ }
+ }
+
+ // Set the correct header, if data is being sent
+ if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
+ jqXHR.setRequestHeader( "Content-Type", s.contentType );
+ }
+
+ // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+ if ( s.ifModified ) {
+ ifModifiedKey = ifModifiedKey || s.url;
+ if ( jQuery.lastModified[ ifModifiedKey ] ) {
+ jqXHR.setRequestHeader( "If-Modified-Since", jQuery.lastModified[ ifModifiedKey ] );
+ }
+ if ( jQuery.etag[ ifModifiedKey ] ) {
+ jqXHR.setRequestHeader( "If-None-Match", jQuery.etag[ ifModifiedKey ] );
+ }
+ }
+
+ // Set the Accepts header for the server, depending on the dataType
+ jqXHR.setRequestHeader(
+ "Accept",
+ s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
+ s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", " + allTypes + "; q=0.01" : "" ) :
+ s.accepts[ "*" ]
+ );
+
+ // Check for headers option
+ for ( i in s.headers ) {
+ jqXHR.setRequestHeader( i, s.headers[ i ] );
+ }
+
+ // Allow custom headers/mimetypes and early abort
+ if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
+ // Abort if not done already
+ jqXHR.abort();
+ return false;
+
+ }
+
+ // Install callbacks on deferreds
+ for ( i in { success: 1, error: 1, complete: 1 } ) {
+ jqXHR[ i ]( s[ i ] );
+ }
+
+ // Get transport
+ transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );
+
+ // If no transport, we auto-abort
+ if ( !transport ) {
+ done( -1, "No Transport" );
+ } else {
+ jqXHR.readyState = 1;
+ // Send global event
+ if ( fireGlobals ) {
+ globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
+ }
+ // Timeout
+ if ( s.async && s.timeout > 0 ) {
+ timeoutTimer = setTimeout( function(){
+ jqXHR.abort( "timeout" );
+ }, s.timeout );
+ }
+
+ try {
+ state = 1;
+ transport.send( requestHeaders, done );
+ } catch (e) {
+ // Propagate exception as error if not done
+ if ( state < 2 ) {
+ done( -1, e );
+ // Simply rethrow otherwise
+ } else {
+ throw e;
+ }
+ }
+ }
+
+ return jqXHR;
+ },
+
+ // Serialize an array of form elements or a set of
+ // key/values into a query string
+ param: function( a, traditional ) {
+ var s = [],
+ add = function( key, value ) {
+ // If value is a function, invoke it and return its value
+ value = jQuery.isFunction( value ) ? value() : value;
+ s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
+ };
+
+ // Set traditional to true for jQuery <= 1.3.2 behavior.
+ if ( traditional === undefined ) {
+ traditional = jQuery.ajaxSettings.traditional;
+ }
+
+ // If an array was passed in, assume that it is an array of form elements.
+ if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
+ // Serialize the form elements
+ jQuery.each( a, function() {
+ add( this.name, this.value );
+ });
+
+ } else {
+ // If traditional, encode the "old" way (the way 1.3.2 or older
+ // did it), otherwise encode params recursively.
+ for ( var prefix in a ) {
+ buildParams( prefix, a[ prefix ], traditional, add );
+ }
+ }
+
+ // Return the resulting serialization
+ return s.join( "&" ).replace( r20, "+" );
+ }
+});
+
+function buildParams( prefix, obj, traditional, add ) {
+ if ( jQuery.isArray( obj ) ) {
+ // Serialize array item.
+ jQuery.each( obj, function( i, v ) {
+ if ( traditional || rbracket.test( prefix ) ) {
+ // Treat each array item as a scalar.
+ add( prefix, v );
+
+ } else {
+ // If array item is non-scalar (array or object), encode its
+ // numeric index to resolve deserialization ambiguity issues.
+ // Note that rack (as of 1.0.0) can't currently deserialize
+ // nested arrays properly, and attempting to do so may cause
+ // a server error. Possible fixes are to modify rack's
+ // deserialization algorithm or to provide an option or flag
+ // to force array serialization to be shallow.
+ buildParams( prefix + "[" + ( typeof v === "object" ? i : "" ) + "]", v, traditional, add );
+ }
+ });
+
+ } else if ( !traditional && jQuery.type( obj ) === "object" ) {
+ // Serialize object item.
+ for ( var name in obj ) {
+ buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
+ }
+
+ } else {
+ // Serialize scalar item.
+ add( prefix, obj );
+ }
+}
+
+// This is still on the jQuery object... for now
+// Want to move this to jQuery.ajax some day
+jQuery.extend({
+
+ // Counter for holding the number of active queries
+ active: 0,
+
+ // Last-Modified header cache for next request
+ lastModified: {},
+ etag: {}
+
+});
+
+/* Handles responses to an ajax request:
+ * - sets all responseXXX fields accordingly
+ * - finds the right dataType (mediates between content-type and expected dataType)
+ * - returns the corresponding response
+ */
+function ajaxHandleResponses( s, jqXHR, responses ) {
+
+ var contents = s.contents,
+ dataTypes = s.dataTypes,
+ responseFields = s.responseFields,
+ ct,
+ type,
+ finalDataType,
+ firstDataType;
+
+ // Fill responseXXX fields
+ for ( type in responseFields ) {
+ if ( type in responses ) {
+ jqXHR[ responseFields[type] ] = responses[ type ];
+ }
+ }
+
+ // Remove auto dataType and get content-type in the process
+ while( dataTypes[ 0 ] === "*" ) {
+ dataTypes.shift();
+ if ( ct === undefined ) {
+ ct = s.mimeType || jqXHR.getResponseHeader( "content-type" );
+ }
+ }
+
+ // Check if we're dealing with a known content-type
+ if ( ct ) {
+ for ( type in contents ) {
+ if ( contents[ type ] && contents[ type ].test( ct ) ) {
+ dataTypes.unshift( type );
+ break;
+ }
+ }
+ }
+
+ // Check to see if we have a response for the expected dataType
+ if ( dataTypes[ 0 ] in responses ) {
+ finalDataType = dataTypes[ 0 ];
+ } else {
+ // Try convertible dataTypes
+ for ( type in responses ) {
+ if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
+ finalDataType = type;
+ break;
+ }
+ if ( !firstDataType ) {
+ firstDataType = type;
+ }
+ }
+ // Or just use first one
+ finalDataType = finalDataType || firstDataType;
+ }
+
+ // If we found a dataType
+ // We add the dataType to the list if needed
+ // and return the corresponding response
+ if ( finalDataType ) {
+ if ( finalDataType !== dataTypes[ 0 ] ) {
+ dataTypes.unshift( finalDataType );
+ }
+ return responses[ finalDataType ];
+ }
+}
+
+// Chain conversions given the request and the original response
+function ajaxConvert( s, response ) {
+
+ // Apply the dataFilter if provided
+ if ( s.dataFilter ) {
+ response = s.dataFilter( response, s.dataType );
+ }
+
+ var dataTypes = s.dataTypes,
+ converters = {},
+ i,
+ key,
+ length = dataTypes.length,
+ tmp,
+ // Current and previous dataTypes
+ current = dataTypes[ 0 ],
+ prev,
+ // Conversion expression
+ conversion,
+ // Conversion function
+ conv,
+ // Conversion functions (transitive conversion)
+ conv1,
+ conv2;
+
+ // For each dataType in the chain
+ for ( i = 1; i < length; i++ ) {
+
+ // Create converters map
+ // with lowercased keys
+ if ( i === 1 ) {
+ for ( key in s.converters ) {
+ if ( typeof key === "string" ) {
+ converters[ key.toLowerCase() ] = s.converters[ key ];
+ }
+ }
+ }
+
+ // Get the dataTypes
+ prev = current;
+ current = dataTypes[ i ];
+
+ // If current is auto dataType, update it to prev
+ if ( current === "*" ) {
+ current = prev;
+ // If no auto and dataTypes are actually different
+ } else if ( prev !== "*" && prev !== current ) {
+
+ // Get the converter
+ conversion = prev + " " + current;
+ conv = converters[ conversion ] || converters[ "* " + current ];
+
+ // If there is no direct converter, search transitively
+ if ( !conv ) {
+ conv2 = undefined;
+ for ( conv1 in converters ) {
+ tmp = conv1.split( " " );
+ if ( tmp[ 0 ] === prev || tmp[ 0 ] === "*" ) {
+ conv2 = converters[ tmp[1] + " " + current ];
+ if ( conv2 ) {
+ conv1 = converters[ conv1 ];
+ if ( conv1 === true ) {
+ conv = conv2;
+ } else if ( conv2 === true ) {
+ conv = conv1;
+ }
+ break;
+ }
+ }
+ }
+ }
+ // If we found no converter, dispatch an error
+ if ( !( conv || conv2 ) ) {
+ jQuery.error( "No conversion from " + conversion.replace(" "," to ") );
+ }
+ // If found converter is not an equivalence
+ if ( conv !== true ) {
+ // Convert with 1 or 2 converters accordingly
+ response = conv ? conv( response ) : conv2( conv1(response) );
+ }
+ }
+ }
+ return response;
+}
+
+
+
+
+var jsc = jQuery.now(),
+ jsre = /(\=)\?(&|$)|\?\?/i;
+
+// Default jsonp settings
+jQuery.ajaxSetup({
+ jsonp: "callback",
+ jsonpCallback: function() {
+ return jQuery.expando + "_" + ( jsc++ );
+ }
+});
+
+// Detect, normalize options and install callbacks for jsonp requests
+jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {
+
+ var inspectData = ( typeof s.data === "string" ) && /^application\/x\-www\-form\-urlencoded/.test( s.contentType );
+
+ if ( s.dataTypes[ 0 ] === "jsonp" ||
+ s.jsonp !== false && ( jsre.test( s.url ) ||
+ inspectData && jsre.test( s.data ) ) ) {
+
+ var responseContainer,
+ jsonpCallback = s.jsonpCallback =
+ jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback,
+ previous = window[ jsonpCallback ],
+ url = s.url,
+ data = s.data,
+ replace = "$1" + jsonpCallback + "$2";
+
+ if ( s.jsonp !== false ) {
+ url = url.replace( jsre, replace );
+ if ( s.url === url ) {
+ if ( inspectData ) {
+ data = data.replace( jsre, replace );
+ }
+ if ( s.data === data ) {
+ // Add callback manually
+ url += (/\?/.test( url ) ? "&" : "?") + s.jsonp + "=" + jsonpCallback;
+ }
+ }
+ }
+
+ s.url = url;
+ s.data = data;
+
+ // Install callback
+ window[ jsonpCallback ] = function( response ) {
+ responseContainer = [ response ];
+ };
+
+ // Clean-up function
+ jqXHR.always(function() {
+ // Set callback back to previous value
+ window[ jsonpCallback ] = previous;
+ // Call if it was a function and we have a response
+ if ( responseContainer && jQuery.isFunction( previous ) ) {
+ window[ jsonpCallback ]( responseContainer[ 0 ] );
+ }
+ });
+
+ // Use data converter to retrieve json after script execution
+ s.converters["script json"] = function() {
+ if ( !responseContainer ) {
+ jQuery.error( jsonpCallback + " was not called" );
+ }
+ return responseContainer[ 0 ];
+ };
+
+ // force json dataType
+ s.dataTypes[ 0 ] = "json";
+
+ // Delegate to script
+ return "script";
+ }
+});
+
+
+
+
+// Install script dataType
+jQuery.ajaxSetup({
+ accepts: {
+ script: "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"
+ },
+ contents: {
+ script: /javascript|ecmascript/
+ },
+ converters: {
+ "text script": function( text ) {
+ jQuery.globalEval( text );
+ return text;
+ }
+ }
+});
+
+// Handle cache's special case and global
+jQuery.ajaxPrefilter( "script", function( s ) {
+ if ( s.cache === undefined ) {
+ s.cache = false;
+ }
+ if ( s.crossDomain ) {
+ s.type = "GET";
+ s.global = false;
+ }
+});
+
+// Bind script tag hack transport
+jQuery.ajaxTransport( "script", function(s) {
+
+ // This transport only deals with cross domain requests
+ if ( s.crossDomain ) {
+
+ var script,
+ head = document.head || document.getElementsByTagName( "head" )[0] || document.documentElement;
+
+ return {
+
+ send: function( _, callback ) {
+
+ script = document.createElement( "script" );
+
+ script.async = "async";
+
+ if ( s.scriptCharset ) {
+ script.charset = s.scriptCharset;
+ }
+
+ script.src = s.url;
+
+ // Attach handlers for all browsers
+ script.onload = script.onreadystatechange = function( _, isAbort ) {
+
+ if ( isAbort || !script.readyState || /loaded|complete/.test( script.readyState ) ) {
+
+ // Handle memory leak in IE
+ script.onload = script.onreadystatechange = null;
+
+ // Remove the script
+ if ( head && script.parentNode ) {
+ head.removeChild( script );
+ }
+
+ // Dereference the script
+ script = undefined;
+
+ // Callback if not abort
+ if ( !isAbort ) {
+ callback( 200, "success" );
+ }
+ }
+ };
+ // Use insertBefore instead of appendChild to circumvent an IE6 bug.
+ // This arises when a base node is used (#2709 and #4378).
+ head.insertBefore( script, head.firstChild );
+ },
+
+ abort: function() {
+ if ( script ) {
+ script.onload( 0, 1 );
+ }
+ }
+ };
+ }
+});
+
+
+
+
+var // #5280: Internet Explorer will keep connections alive if we don't abort on unload
+ xhrOnUnloadAbort = window.ActiveXObject ? function() {
+ // Abort all pending requests
+ for ( var key in xhrCallbacks ) {
+ xhrCallbacks[ key ]( 0, 1 );
+ }
+ } : false,
+ xhrId = 0,
+ xhrCallbacks;
+
+// Functions to create xhrs
+function createStandardXHR() {
+ try {
+ return new window.XMLHttpRequest();
+ } catch( e ) {}
+}
+
+function createActiveXHR() {
+ try {
+ return new window.ActiveXObject( "Microsoft.XMLHTTP" );
+ } catch( e ) {}
+}
+
+// Create the request object
+// (This is still attached to ajaxSettings for backward compatibility)
+jQuery.ajaxSettings.xhr = window.ActiveXObject ?
+ /* Microsoft failed to properly
+ * implement the XMLHttpRequest in IE7 (can't request local files),
+ * so we use the ActiveXObject when it is available
+ * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
+ * we need a fallback.
+ */
+ function() {
+ return !this.isLocal && createStandardXHR() || createActiveXHR();
+ } :
+ // For all other browsers, use the standard XMLHttpRequest object
+ createStandardXHR;
+
+// Determine support properties
+(function( xhr ) {
+ jQuery.extend( jQuery.support, {
+ ajax: !!xhr,
+ cors: !!xhr && ( "withCredentials" in xhr )
+ });
+})( jQuery.ajaxSettings.xhr() );
+
+// Create transport if the browser can provide an xhr
+if ( jQuery.support.ajax ) {
+
+ jQuery.ajaxTransport(function( s ) {
+ // Cross domain only allowed if supported through XMLHttpRequest
+ if ( !s.crossDomain || jQuery.support.cors ) {
+
+ var callback;
+
+ return {
+ send: function( headers, complete ) {
+
+ // Get a new xhr
+ var xhr = s.xhr(),
+ handle,
+ i;
+
+ // Open the socket
+ // Passing null username, generates a login popup on Opera (#2865)
+ if ( s.username ) {
+ xhr.open( s.type, s.url, s.async, s.username, s.password );
+ } else {
+ xhr.open( s.type, s.url, s.async );
+ }
+
+ // Apply custom fields if provided
+ if ( s.xhrFields ) {
+ for ( i in s.xhrFields ) {
+ xhr[ i ] = s.xhrFields[ i ];
+ }
+ }
+
+ // Override mime type if needed
+ if ( s.mimeType && xhr.overrideMimeType ) {
+ xhr.overrideMimeType( s.mimeType );
+ }
+
+ // X-Requested-With header
+ // For cross-domain requests, seeing as conditions for a preflight are
+ // akin to a jigsaw puzzle, we simply never set it to be sure.
+ // (it can always be set on a per-request basis or even using ajaxSetup)
+ // For same-domain requests, won't change header if already provided.
+ if ( !s.crossDomain && !headers["X-Requested-With"] ) {
+ headers[ "X-Requested-With" ] = "XMLHttpRequest";
+ }
+
+ // Need an extra try/catch for cross domain requests in Firefox 3
+ try {
+ for ( i in headers ) {
+ xhr.setRequestHeader( i, headers[ i ] );
+ }
+ } catch( _ ) {}
+
+ // Do send the request
+ // This may raise an exception which is actually
+ // handled in jQuery.ajax (so no try/catch here)
+ xhr.send( ( s.hasContent && s.data ) || null );
+
+ // Listener
+ callback = function( _, isAbort ) {
+
+ var status,
+ statusText,
+ responseHeaders,
+ responses,
+ xml;
+
+ // Firefox throws exceptions when accessing properties
+ // of an xhr when a network error occured
+ // http://helpful.knobs-dials.com/index.php/Component_returned_failure_code:_0x80040111_(NS_ERROR_NOT_AVAILABLE)
+ try {
+
+ // Was never called and is aborted or complete
+ if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
+
+ // Only called once
+ callback = undefined;
+
+ // Do not keep as active anymore
+ if ( handle ) {
+ xhr.onreadystatechange = jQuery.noop;
+ if ( xhrOnUnloadAbort ) {
+ delete xhrCallbacks[ handle ];
+ }
+ }
+
+ // If it's an abort
+ if ( isAbort ) {
+ // Abort it manually if needed
+ if ( xhr.readyState !== 4 ) {
+ xhr.abort();
+ }
+ } else {
+ status = xhr.status;
+ responseHeaders = xhr.getAllResponseHeaders();
+ responses = {};
+ xml = xhr.responseXML;
+
+ // Construct response list
+ if ( xml && xml.documentElement /* #4958 */ ) {
+ responses.xml = xml;
+ }
+
+ // When requesting binary data, IE6-9 will throw an exception
+ // on any attempt to access responseText (#11426)
+ try {
+ responses.text = xhr.responseText;
+ } catch( _ ) {
+ }
+
+ // Firefox throws an exception when accessing
+ // statusText for faulty cross-domain requests
+ try {
+ statusText = xhr.statusText;
+ } catch( e ) {
+ // We normalize with Webkit giving an empty statusText
+ statusText = "";
+ }
+
+ // Filter status for non standard behaviors
+
+ // If the request is local and we have data: assume a success
+ // (success with no data won't get notified, that's the best we
+ // can do given current implementations)
+ if ( !status && s.isLocal && !s.crossDomain ) {
+ status = responses.text ? 200 : 404;
+ // IE - #1450: sometimes returns 1223 when it should be 204
+ } else if ( status === 1223 ) {
+ status = 204;
+ }
+ }
+ }
+ } catch( firefoxAccessException ) {
+ if ( !isAbort ) {
+ complete( -1, firefoxAccessException );
+ }
+ }
+
+ // Call complete if needed
+ if ( responses ) {
+ complete( status, statusText, responses, responseHeaders );
+ }
+ };
+
+ // if we're in sync mode or it's in cache
+ // and has been retrieved directly (IE6 & IE7)
+ // we need to manually fire the callback
+ if ( !s.async || xhr.readyState === 4 ) {
+ callback();
+ } else {
+ handle = ++xhrId;
+ if ( xhrOnUnloadAbort ) {
+ // Create the active xhrs callbacks list if needed
+ // and attach the unload handler
+ if ( !xhrCallbacks ) {
+ xhrCallbacks = {};
+ jQuery( window ).unload( xhrOnUnloadAbort );
+ }
+ // Add to list of active xhrs callbacks
+ xhrCallbacks[ handle ] = callback;
+ }
+ xhr.onreadystatechange = callback;
+ }
+ },
+
+ abort: function() {
+ if ( callback ) {
+ callback(0,1);
+ }
+ }
+ };
+ }
+ });
+}
+
+
+
+
+var elemdisplay = {},
+ iframe, iframeDoc,
+ rfxtypes = /^(?:toggle|show|hide)$/,
+ rfxnum = /^([+\-]=)?([\d+.\-]+)([a-z%]*)$/i,
+ timerId,
+ fxAttrs = [
+ // height animations
+ [ "height", "marginTop", "marginBottom", "paddingTop", "paddingBottom" ],
+ // width animations
+ [ "width", "marginLeft", "marginRight", "paddingLeft", "paddingRight" ],
+ // opacity animations
+ [ "opacity" ]
+ ],
+ fxNow;
+
+jQuery.fn.extend({
+ show: function( speed, easing, callback ) {
+ var elem, display;
+
+ if ( speed || speed === 0 ) {
+ return this.animate( genFx("show", 3), speed, easing, callback );
+
+ } else {
+ for ( var i = 0, j = this.length; i < j; i++ ) {
+ elem = this[ i ];
+
+ if ( elem.style ) {
+ display = elem.style.display;
+
+ // Reset the inline display of this element to learn if it is
+ // being hidden by cascaded rules or not
+ if ( !jQuery._data(elem, "olddisplay") && display === "none" ) {
+ display = elem.style.display = "";
+ }
+
+ // Set elements which have been overridden with display: none
+ // in a stylesheet to whatever the default browser style is
+ // for such an element
+ if ( (display === "" && jQuery.css(elem, "display") === "none") ||
+ !jQuery.contains( elem.ownerDocument.documentElement, elem ) ) {
+ jQuery._data( elem, "olddisplay", defaultDisplay(elem.nodeName) );
+ }
+ }
+ }
+
+ // Set the display of most of the elements in a second loop
+ // to avoid the constant reflow
+ for ( i = 0; i < j; i++ ) {
+ elem = this[ i ];
+
+ if ( elem.style ) {
+ display = elem.style.display;
+
+ if ( display === "" || display === "none" ) {
+ elem.style.display = jQuery._data( elem, "olddisplay" ) || "";
+ }
+ }
+ }
+
+ return this;
+ }
+ },
+
+ hide: function( speed, easing, callback ) {
+ if ( speed || speed === 0 ) {
+ return this.animate( genFx("hide", 3), speed, easing, callback);
+
+ } else {
+ var elem, display,
+ i = 0,
+ j = this.length;
+
+ for ( ; i < j; i++ ) {
+ elem = this[i];
+ if ( elem.style ) {
+ display = jQuery.css( elem, "display" );
+
+ if ( display !== "none" && !jQuery._data( elem, "olddisplay" ) ) {
+ jQuery._data( elem, "olddisplay", display );
+ }
+ }
+ }
+
+ // Set the display of the elements in a second loop
+ // to avoid the constant reflow
+ for ( i = 0; i < j; i++ ) {
+ if ( this[i].style ) {
+ this[i].style.display = "none";
+ }
+ }
+
+ return this;
+ }
+ },
+
+ // Save the old toggle function
+ _toggle: jQuery.fn.toggle,
+
+ toggle: function( fn, fn2, callback ) {
+ var bool = typeof fn === "boolean";
+
+ if ( jQuery.isFunction(fn) && jQuery.isFunction(fn2) ) {
+ this._toggle.apply( this, arguments );
+
+ } else if ( fn == null || bool ) {
+ this.each(function() {
+ var state = bool ? fn : jQuery(this).is(":hidden");
+ jQuery(this)[ state ? "show" : "hide" ]();
+ });
+
+ } else {
+ this.animate(genFx("toggle", 3), fn, fn2, callback);
+ }
+
+ return this;
+ },
+
+ fadeTo: function( speed, to, easing, callback ) {
+ return this.filter(":hidden").css("opacity", 0).show().end()
+ .animate({opacity: to}, speed, easing, callback);
+ },
+
+ animate: function( prop, speed, easing, callback ) {
+ var optall = jQuery.speed( speed, easing, callback );
+
+ if ( jQuery.isEmptyObject( prop ) ) {
+ return this.each( optall.complete, [ false ] );
+ }
+
+ // Do not change referenced properties as per-property easing will be lost
+ prop = jQuery.extend( {}, prop );
+
+ function doAnimation() {
+ // XXX 'this' does not always have a nodeName when running the
+ // test suite
+
+ if ( optall.queue === false ) {
+ jQuery._mark( this );
+ }
+
+ var opt = jQuery.extend( {}, optall ),
+ isElement = this.nodeType === 1,
+ hidden = isElement && jQuery(this).is(":hidden"),
+ name, val, p, e, hooks, replace,
+ parts, start, end, unit,
+ method;
+
+ // will store per property easing and be used to determine when an animation is complete
+ opt.animatedProperties = {};
+
+ // first pass over propertys to expand / normalize
+ for ( p in prop ) {
+ name = jQuery.camelCase( p );
+ if ( p !== name ) {
+ prop[ name ] = prop[ p ];
+ delete prop[ p ];
+ }
+
+ if ( ( hooks = jQuery.cssHooks[ name ] ) && "expand" in hooks ) {
+ replace = hooks.expand( prop[ name ] );
+ delete prop[ name ];
+
+ // not quite $.extend, this wont overwrite keys already present.
+ // also - reusing 'p' from above because we have the correct "name"
+ for ( p in replace ) {
+ if ( ! ( p in prop ) ) {
+ prop[ p ] = replace[ p ];
+ }
+ }
+ }
+ }
+
+ for ( name in prop ) {
+ val = prop[ name ];
+ // easing resolution: per property > opt.specialEasing > opt.easing > 'swing' (default)
+ if ( jQuery.isArray( val ) ) {
+ opt.animatedProperties[ name ] = val[ 1 ];
+ val = prop[ name ] = val[ 0 ];
+ } else {
+ opt.animatedProperties[ name ] = opt.specialEasing && opt.specialEasing[ name ] || opt.easing || 'swing';
+ }
+
+ if ( val === "hide" && hidden || val === "show" && !hidden ) {
+ return opt.complete.call( this );
+ }
+
+ if ( isElement && ( name === "height" || name === "width" ) ) {
+ // Make sure that nothing sneaks out
+ // Record all 3 overflow attributes because IE does not
+ // change the overflow attribute when overflowX and
+ // overflowY are set to the same value
+ opt.overflow = [ this.style.overflow, this.style.overflowX, this.style.overflowY ];
+
+ // Set display property to inline-block for height/width
+ // animations on inline elements that are having width/height animated
+ if ( jQuery.css( this, "display" ) === "inline" &&
+ jQuery.css( this, "float" ) === "none" ) {
+
+ // inline-level elements accept inline-block;
+ // block-level elements need to be inline with layout
+ if ( !jQuery.support.inlineBlockNeedsLayout || defaultDisplay( this.nodeName ) === "inline" ) {
+ this.style.display = "inline-block";
+
+ } else {
+ this.style.zoom = 1;
+ }
+ }
+ }
+ }
+
+ if ( opt.overflow != null ) {
+ this.style.overflow = "hidden";
+ }
+
+ for ( p in prop ) {
+ e = new jQuery.fx( this, opt, p );
+ val = prop[ p ];
+
+ if ( rfxtypes.test( val ) ) {
+
+ // Tracks whether to show or hide based on private
+ // data attached to the element
+ method = jQuery._data( this, "toggle" + p ) || ( val === "toggle" ? hidden ? "show" : "hide" : 0 );
+ if ( method ) {
+ jQuery._data( this, "toggle" + p, method === "show" ? "hide" : "show" );
+ e[ method ]();
+ } else {
+ e[ val ]();
+ }
+
+ } else {
+ parts = rfxnum.exec( val );
+ start = e.cur();
+
+ if ( parts ) {
+ end = parseFloat( parts[2] );
+ unit = parts[3] || ( jQuery.cssNumber[ p ] ? "" : "px" );
+
+ // We need to compute starting value
+ if ( unit !== "px" ) {
+ jQuery.style( this, p, (end || 1) + unit);
+ start = ( (end || 1) / e.cur() ) * start;
+ jQuery.style( this, p, start + unit);
+ }
+
+ // If a +=/-= token was provided, we're doing a relative animation
+ if ( parts[1] ) {
+ end = ( (parts[ 1 ] === "-=" ? -1 : 1) * end ) + start;
+ }
+
+ e.custom( start, end, unit );
+
+ } else {
+ e.custom( start, val, "" );
+ }
+ }
+ }
+
+ // For JS strict compliance
+ return true;
+ }
+
+ return optall.queue === false ?
+ this.each( doAnimation ) :
+ this.queue( optall.queue, doAnimation );
+ },
+
+ stop: function( type, clearQueue, gotoEnd ) {
+ if ( typeof type !== "string" ) {
+ gotoEnd = clearQueue;
+ clearQueue = type;
+ type = undefined;
+ }
+ if ( clearQueue && type !== false ) {
+ this.queue( type || "fx", [] );
+ }
+
+ return this.each(function() {
+ var index,
+ hadTimers = false,
+ timers = jQuery.timers,
+ data = jQuery._data( this );
+
+ // clear marker counters if we know they won't be
+ if ( !gotoEnd ) {
+ jQuery._unmark( true, this );
+ }
+
+ function stopQueue( elem, data, index ) {
+ var hooks = data[ index ];
+ jQuery.removeData( elem, index, true );
+ hooks.stop( gotoEnd );
+ }
+
+ if ( type == null ) {
+ for ( index in data ) {
+ if ( data[ index ] && data[ index ].stop && index.indexOf(".run") === index.length - 4 ) {
+ stopQueue( this, data, index );
+ }
+ }
+ } else if ( data[ index = type + ".run" ] && data[ index ].stop ){
+ stopQueue( this, data, index );
+ }
+
+ for ( index = timers.length; index--; ) {
+ if ( timers[ index ].elem === this && (type == null || timers[ index ].queue === type) ) {
+ if ( gotoEnd ) {
+
+ // force the next step to be the last
+ timers[ index ]( true );
+ } else {
+ timers[ index ].saveState();
+ }
+ hadTimers = true;
+ timers.splice( index, 1 );
+ }
+ }
+
+ // start the next in the queue if the last step wasn't forced
+ // timers currently will call their complete callbacks, which will dequeue
+ // but only if they were gotoEnd
+ if ( !( gotoEnd && hadTimers ) ) {
+ jQuery.dequeue( this, type );
+ }
+ });
+ }
+
+});
+
+// Animations created synchronously will run synchronously
+function createFxNow() {
+ setTimeout( clearFxNow, 0 );
+ return ( fxNow = jQuery.now() );
+}
+
+function clearFxNow() {
+ fxNow = undefined;
+}
+
+// Generate parameters to create a standard animation
+function genFx( type, num ) {
+ var obj = {};
+
+ jQuery.each( fxAttrs.concat.apply([], fxAttrs.slice( 0, num )), function() {
+ obj[ this ] = type;
+ });
+
+ return obj;
+}
+
+// Generate shortcuts for custom animations
+jQuery.each({
+ slideDown: genFx( "show", 1 ),
+ slideUp: genFx( "hide", 1 ),
+ slideToggle: genFx( "toggle", 1 ),
+ fadeIn: { opacity: "show" },
+ fadeOut: { opacity: "hide" },
+ fadeToggle: { opacity: "toggle" }
+}, function( name, props ) {
+ jQuery.fn[ name ] = function( speed, easing, callback ) {
+ return this.animate( props, speed, easing, callback );
+ };
+});
+
+jQuery.extend({
+ speed: function( speed, easing, fn ) {
+ var opt = speed && typeof speed === "object" ? jQuery.extend( {}, speed ) : {
+ complete: fn || !fn && easing ||
+ jQuery.isFunction( speed ) && speed,
+ duration: speed,
+ easing: fn && easing || easing && !jQuery.isFunction( easing ) && easing
+ };
+
+ opt.duration = jQuery.fx.off ? 0 : typeof opt.duration === "number" ? opt.duration :
+ opt.duration in jQuery.fx.speeds ? jQuery.fx.speeds[ opt.duration ] : jQuery.fx.speeds._default;
+
+ // normalize opt.queue - true/undefined/null -> "fx"
+ if ( opt.queue == null || opt.queue === true ) {
+ opt.queue = "fx";
+ }
+
+ // Queueing
+ opt.old = opt.complete;
+
+ opt.complete = function( noUnmark ) {
+ if ( jQuery.isFunction( opt.old ) ) {
+ opt.old.call( this );
+ }
+
+ if ( opt.queue ) {
+ jQuery.dequeue( this, opt.queue );
+ } else if ( noUnmark !== false ) {
+ jQuery._unmark( this );
+ }
+ };
+
+ return opt;
+ },
+
+ easing: {
+ linear: function( p ) {
+ return p;
+ },
+ swing: function( p ) {
+ return ( -Math.cos( p*Math.PI ) / 2 ) + 0.5;
+ }
+ },
+
+ timers: [],
+
+ fx: function( elem, options, prop ) {
+ this.options = options;
+ this.elem = elem;
+ this.prop = prop;
+
+ options.orig = options.orig || {};
+ }
+
+});
+
+jQuery.fx.prototype = {
+ // Simple function for setting a style value
+ update: function() {
+ if ( this.options.step ) {
+ this.options.step.call( this.elem, this.now, this );
+ }
+
+ ( jQuery.fx.step[ this.prop ] || jQuery.fx.step._default )( this );
+ },
+
+ // Get the current size
+ cur: function() {
+ if ( this.elem[ this.prop ] != null && (!this.elem.style || this.elem.style[ this.prop ] == null) ) {
+ return this.elem[ this.prop ];
+ }
+
+ var parsed,
+ r = jQuery.css( this.elem, this.prop );
+ // Empty strings, null, undefined and "auto" are converted to 0,
+ // complex values such as "rotate(1rad)" are returned as is,
+ // simple values such as "10px" are parsed to Float.
+ return isNaN( parsed = parseFloat( r ) ) ? !r || r === "auto" ? 0 : r : parsed;
+ },
+
+ // Start an animation from one number to another
+ custom: function( from, to, unit ) {
+ var self = this,
+ fx = jQuery.fx;
+
+ this.startTime = fxNow || createFxNow();
+ this.end = to;
+ this.now = this.start = from;
+ this.pos = this.state = 0;
+ this.unit = unit || this.unit || ( jQuery.cssNumber[ this.prop ] ? "" : "px" );
+
+ function t( gotoEnd ) {
+ return self.step( gotoEnd );
+ }
+
+ t.queue = this.options.queue;
+ t.elem = this.elem;
+ t.saveState = function() {
+ if ( jQuery._data( self.elem, "fxshow" + self.prop ) === undefined ) {
+ if ( self.options.hide ) {
+ jQuery._data( self.elem, "fxshow" + self.prop, self.start );
+ } else if ( self.options.show ) {
+ jQuery._data( self.elem, "fxshow" + self.prop, self.end );
+ }
+ }
+ };
+
+ if ( t() && jQuery.timers.push(t) && !timerId ) {
+ timerId = setInterval( fx.tick, fx.interval );
+ }
+ },
+
+ // Simple 'show' function
+ show: function() {
+ var dataShow = jQuery._data( this.elem, "fxshow" + this.prop );
+
+ // Remember where we started, so that we can go back to it later
+ this.options.orig[ this.prop ] = dataShow || jQuery.style( this.elem, this.prop );
+ this.options.show = true;
+
+ // Begin the animation
+ // Make sure that we start at a small width/height to avoid any flash of content
+ if ( dataShow !== undefined ) {
+ // This show is picking up where a previous hide or show left off
+ this.custom( this.cur(), dataShow );
+ } else {
+ this.custom( this.prop === "width" || this.prop === "height" ? 1 : 0, this.cur() );
+ }
+
+ // Start by showing the element
+ jQuery( this.elem ).show();
+ },
+
+ // Simple 'hide' function
+ hide: function() {
+ // Remember where we started, so that we can go back to it later
+ this.options.orig[ this.prop ] = jQuery._data( this.elem, "fxshow" + this.prop ) || jQuery.style( this.elem, this.prop );
+ this.options.hide = true;
+
+ // Begin the animation
+ this.custom( this.cur(), 0 );
+ },
+
+ // Each step of an animation
+ step: function( gotoEnd ) {
+ var p, n, complete,
+ t = fxNow || createFxNow(),
+ done = true,
+ elem = this.elem,
+ options = this.options;
+
+ if ( gotoEnd || t >= options.duration + this.startTime ) {
+ this.now = this.end;
+ this.pos = this.state = 1;
+ this.update();
+
+ options.animatedProperties[ this.prop ] = true;
+
+ for ( p in options.animatedProperties ) {
+ if ( options.animatedProperties[ p ] !== true ) {
+ done = false;
+ }
+ }
+
+ if ( done ) {
+ // Reset the overflow
+ if ( options.overflow != null && !jQuery.support.shrinkWrapBlocks ) {
+
+ jQuery.each( [ "", "X", "Y" ], function( index, value ) {
+ elem.style[ "overflow" + value ] = options.overflow[ index ];
+ });
+ }
+
+ // Hide the element if the "hide" operation was done
+ if ( options.hide ) {
+ jQuery( elem ).hide();
+ }
+
+ // Reset the properties, if the item has been hidden or shown
+ if ( options.hide || options.show ) {
+ for ( p in options.animatedProperties ) {
+ jQuery.style( elem, p, options.orig[ p ] );
+ jQuery.removeData( elem, "fxshow" + p, true );
+ // Toggle data is no longer needed
+ jQuery.removeData( elem, "toggle" + p, true );
+ }
+ }
+
+ // Execute the complete function
+ // in the event that the complete function throws an exception
+ // we must ensure it won't be called twice. #5684
+
+ complete = options.complete;
+ if ( complete ) {
+
+ options.complete = false;
+ complete.call( elem );
+ }
+ }
+
+ return false;
+
+ } else {
+ // classical easing cannot be used with an Infinity duration
+ if ( options.duration == Infinity ) {
+ this.now = t;
+ } else {
+ n = t - this.startTime;
+ this.state = n / options.duration;
+
+ // Perform the easing function, defaults to swing
+ this.pos = jQuery.easing[ options.animatedProperties[this.prop] ]( this.state, n, 0, 1, options.duration );
+ this.now = this.start + ( (this.end - this.start) * this.pos );
+ }
+ // Perform the next step of the animation
+ this.update();
+ }
+
+ return true;
+ }
+};
+
+jQuery.extend( jQuery.fx, {
+ tick: function() {
+ var timer,
+ timers = jQuery.timers,
+ i = 0;
+
+ for ( ; i < timers.length; i++ ) {
+ timer = timers[ i ];
+ // Checks the timer has not already been removed
+ if ( !timer() && timers[ i ] === timer ) {
+ timers.splice( i--, 1 );
+ }
+ }
+
+ if ( !timers.length ) {
+ jQuery.fx.stop();
+ }
+ },
+
+ interval: 13,
+
+ stop: function() {
+ clearInterval( timerId );
+ timerId = null;
+ },
+
+ speeds: {
+ slow: 600,
+ fast: 200,
+ // Default speed
+ _default: 400
+ },
+
+ step: {
+ opacity: function( fx ) {
+ jQuery.style( fx.elem, "opacity", fx.now );
+ },
+
+ _default: function( fx ) {
+ if ( fx.elem.style && fx.elem.style[ fx.prop ] != null ) {
+ fx.elem.style[ fx.prop ] = fx.now + fx.unit;
+ } else {
+ fx.elem[ fx.prop ] = fx.now;
+ }
+ }
+ }
+});
+
+// Ensure props that can't be negative don't go there on undershoot easing
+jQuery.each( fxAttrs.concat.apply( [], fxAttrs ), function( i, prop ) {
+ // exclude marginTop, marginLeft, marginBottom and marginRight from this list
+ if ( prop.indexOf( "margin" ) ) {
+ jQuery.fx.step[ prop ] = function( fx ) {
+ jQuery.style( fx.elem, prop, Math.max(0, fx.now) + fx.unit );
+ };
+ }
+});
+
+if ( jQuery.expr && jQuery.expr.filters ) {
+ jQuery.expr.filters.animated = function( elem ) {
+ return jQuery.grep(jQuery.timers, function( fn ) {
+ return elem === fn.elem;
+ }).length;
+ };
+}
+
+// Try to restore the default display value of an element
+function defaultDisplay( nodeName ) {
+
+ if ( !elemdisplay[ nodeName ] ) {
+
+ var body = document.body,
+ elem = jQuery( "<" + nodeName + ">" ).appendTo( body ),
+ display = elem.css( "display" );
+ elem.remove();
+
+ // If the simple way fails,
+ // get element's real default display by attaching it to a temp iframe
+ if ( display === "none" || display === "" ) {
+ // No iframe to use yet, so create it
+ if ( !iframe ) {
+ iframe = document.createElement( "iframe" );
+ iframe.frameBorder = iframe.width = iframe.height = 0;
+ }
+
+ body.appendChild( iframe );
+
+ // Create a cacheable copy of the iframe document on first call.
+ // IE and Opera will allow us to reuse the iframeDoc without re-writing the fake HTML
+ // document to it; WebKit & Firefox won't allow reusing the iframe document.
+ if ( !iframeDoc || !iframe.createElement ) {
+ iframeDoc = ( iframe.contentWindow || iframe.contentDocument ).document;
+ iframeDoc.write( ( jQuery.support.boxModel ? "<!doctype html>" : "" ) + "<html><body>" );
+ iframeDoc.close();
+ }
+
+ elem = iframeDoc.createElement( nodeName );
+
+ iframeDoc.body.appendChild( elem );
+
+ display = jQuery.css( elem, "display" );
+ body.removeChild( iframe );
+ }
+
+ // Store the correct default display
+ elemdisplay[ nodeName ] = display;
+ }
+
+ return elemdisplay[ nodeName ];
+}
+
+
+
+
+var getOffset,
+ rtable = /^t(?:able|d|h)$/i,
+ rroot = /^(?:body|html)$/i;
+
+if ( "getBoundingClientRect" in document.documentElement ) {
+ getOffset = function( elem, doc, docElem, box ) {
+ try {
+ box = elem.getBoundingClientRect();
+ } catch(e) {}
+
+ // Make sure we're not dealing with a disconnected DOM node
+ if ( !box || !jQuery.contains( docElem, elem ) ) {
+ return box ? { top: box.top, left: box.left } : { top: 0, left: 0 };
+ }
+
+ var body = doc.body,
+ win = getWindow( doc ),
+ clientTop = docElem.clientTop || body.clientTop || 0,
+ clientLeft = docElem.clientLeft || body.clientLeft || 0,
+ scrollTop = win.pageYOffset || jQuery.support.boxModel && docElem.scrollTop || body.scrollTop,
+ scrollLeft = win.pageXOffset || jQuery.support.boxModel && docElem.scrollLeft || body.scrollLeft,
+ top = box.top + scrollTop - clientTop,
+ left = box.left + scrollLeft - clientLeft;
+
+ return { top: top, left: left };
+ };
+
+} else {
+ getOffset = function( elem, doc, docElem ) {
+ var computedStyle,
+ offsetParent = elem.offsetParent,
+ prevOffsetParent = elem,
+ body = doc.body,
+ defaultView = doc.defaultView,
+ prevComputedStyle = defaultView ? defaultView.getComputedStyle( elem, null ) : elem.currentStyle,
+ top = elem.offsetTop,
+ left = elem.offsetLeft;
+
+ while ( (elem = elem.parentNode) && elem !== body && elem !== docElem ) {
+ if ( jQuery.support.fixedPosition && prevComputedStyle.position === "fixed" ) {
+ break;
+ }
+
+ computedStyle = defaultView ? defaultView.getComputedStyle(elem, null) : elem.currentStyle;
+ top -= elem.scrollTop;
+ left -= elem.scrollLeft;
+
+ if ( elem === offsetParent ) {
+ top += elem.offsetTop;
+ left += elem.offsetLeft;
+
+ if ( jQuery.support.doesNotAddBorder && !(jQuery.support.doesAddBorderForTableAndCells && rtable.test(elem.nodeName)) ) {
+ top += parseFloat( computedStyle.borderTopWidth ) || 0;
+ left += parseFloat( computedStyle.borderLeftWidth ) || 0;
+ }
+
+ prevOffsetParent = offsetParent;
+ offsetParent = elem.offsetParent;
+ }
+
+ if ( jQuery.support.subtractsBorderForOverflowNotVisible && computedStyle.overflow !== "visible" ) {
+ top += parseFloat( computedStyle.borderTopWidth ) || 0;
+ left += parseFloat( computedStyle.borderLeftWidth ) || 0;
+ }
+
+ prevComputedStyle = computedStyle;
+ }
+
+ if ( prevComputedStyle.position === "relative" || prevComputedStyle.position === "static" ) {
+ top += body.offsetTop;
+ left += body.offsetLeft;
+ }
+
+ if ( jQuery.support.fixedPosition && prevComputedStyle.position === "fixed" ) {
+ top += Math.max( docElem.scrollTop, body.scrollTop );
+ left += Math.max( docElem.scrollLeft, body.scrollLeft );
+ }
+
+ return { top: top, left: left };
+ };
+}
+
+jQuery.fn.offset = function( options ) {
+ if ( arguments.length ) {
+ return options === undefined ?
+ this :
+ this.each(function( i ) {
+ jQuery.offset.setOffset( this, options, i );
+ });
+ }
+
+ var elem = this[0],
+ doc = elem && elem.ownerDocument;
+
+ if ( !doc ) {
+ return null;
+ }
+
+ if ( elem === doc.body ) {
+ return jQuery.offset.bodyOffset( elem );
+ }
+
+ return getOffset( elem, doc, doc.documentElement );
+};
+
+jQuery.offset = {
+
+ bodyOffset: function( body ) {
+ var top = body.offsetTop,
+ left = body.offsetLeft;
+
+ if ( jQuery.support.doesNotIncludeMarginInBodyOffset ) {
+ top += parseFloat( jQuery.css(body, "marginTop") ) || 0;
+ left += parseFloat( jQuery.css(body, "marginLeft") ) || 0;
+ }
+
+ return { top: top, left: left };
+ },
+
+ setOffset: function( elem, options, i ) {
+ var position = jQuery.css( elem, "position" );
+
+ // set position first, in-case top/left are set even on static elem
+ if ( position === "static" ) {
+ elem.style.position = "relative";
+ }
+
+ var curElem = jQuery( elem ),
+ curOffset = curElem.offset(),
+ curCSSTop = jQuery.css( elem, "top" ),
+ curCSSLeft = jQuery.css( elem, "left" ),
+ calculatePosition = ( position === "absolute" || position === "fixed" ) && jQuery.inArray("auto", [curCSSTop, curCSSLeft]) > -1,
+ props = {}, curPosition = {}, curTop, curLeft;
+
+ // need to be able to calculate position if either top or left is auto and position is either absolute or fixed
+ if ( calculatePosition ) {
+ curPosition = curElem.position();
+ curTop = curPosition.top;
+ curLeft = curPosition.left;
+ } else {
+ curTop = parseFloat( curCSSTop ) || 0;
+ curLeft = parseFloat( curCSSLeft ) || 0;
+ }
+
+ if ( jQuery.isFunction( options ) ) {
+ options = options.call( elem, i, curOffset );
+ }
+
+ if ( options.top != null ) {
+ props.top = ( options.top - curOffset.top ) + curTop;
+ }
+ if ( options.left != null ) {
+ props.left = ( options.left - curOffset.left ) + curLeft;
+ }
+
+ if ( "using" in options ) {
+ options.using.call( elem, props );
+ } else {
+ curElem.css( props );
+ }
+ }
+};
+
+
+jQuery.fn.extend({
+
+ position: function() {
+ if ( !this[0] ) {
+ return null;
+ }
+
+ var elem = this[0],
+
+ // Get *real* offsetParent
+ offsetParent = this.offsetParent(),
+
+ // Get correct offsets
+ offset = this.offset(),
+ parentOffset = rroot.test(offsetParent[0].nodeName) ? { top: 0, left: 0 } : offsetParent.offset();
+
+ // Subtract element margins
+ // note: when an element has margin: auto the offsetLeft and marginLeft
+ // are the same in Safari causing offset.left to incorrectly be 0
+ offset.top -= parseFloat( jQuery.css(elem, "marginTop") ) || 0;
+ offset.left -= parseFloat( jQuery.css(elem, "marginLeft") ) || 0;
+
+ // Add offsetParent borders
+ parentOffset.top += parseFloat( jQuery.css(offsetParent[0], "borderTopWidth") ) || 0;
+ parentOffset.left += parseFloat( jQuery.css(offsetParent[0], "borderLeftWidth") ) || 0;
+
+ // Subtract the two offsets
+ return {
+ top: offset.top - parentOffset.top,
+ left: offset.left - parentOffset.left
+ };
+ },
+
+ offsetParent: function() {
+ return this.map(function() {
+ var offsetParent = this.offsetParent || document.body;
+ while ( offsetParent && (!rroot.test(offsetParent.nodeName) && jQuery.css(offsetParent, "position") === "static") ) {
+ offsetParent = offsetParent.offsetParent;
+ }
+ return offsetParent;
+ });
+ }
+});
+
+
+// Create scrollLeft and scrollTop methods
+jQuery.each( {scrollLeft: "pageXOffset", scrollTop: "pageYOffset"}, function( method, prop ) {
+ var top = /Y/.test( prop );
+
+ jQuery.fn[ method ] = function( val ) {
+ return jQuery.access( this, function( elem, method, val ) {
+ var win = getWindow( elem );
+
+ if ( val === undefined ) {
+ return win ? (prop in win) ? win[ prop ] :
+ jQuery.support.boxModel && win.document.documentElement[ method ] ||
+ win.document.body[ method ] :
+ elem[ method ];
+ }
+
+ if ( win ) {
+ win.scrollTo(
+ !top ? val : jQuery( win ).scrollLeft(),
+ top ? val : jQuery( win ).scrollTop()
+ );
+
+ } else {
+ elem[ method ] = val;
+ }
+ }, method, val, arguments.length, null );
+ };
+});
+
+function getWindow( elem ) {
+ return jQuery.isWindow( elem ) ?
+ elem :
+ elem.nodeType === 9 ?
+ elem.defaultView || elem.parentWindow :
+ false;
+}
+
+
+
+
+// Create width, height, innerHeight, innerWidth, outerHeight and outerWidth methods
+jQuery.each( { Height: "height", Width: "width" }, function( name, type ) {
+ var clientProp = "client" + name,
+ scrollProp = "scroll" + name,
+ offsetProp = "offset" + name;
+
+ // innerHeight and innerWidth
+ jQuery.fn[ "inner" + name ] = function() {
+ var elem = this[0];
+ return elem ?
+ elem.style ?
+ parseFloat( jQuery.css( elem, type, "padding" ) ) :
+ this[ type ]() :
+ null;
+ };
+
+ // outerHeight and outerWidth
+ jQuery.fn[ "outer" + name ] = function( margin ) {
+ var elem = this[0];
+ return elem ?
+ elem.style ?
+ parseFloat( jQuery.css( elem, type, margin ? "margin" : "border" ) ) :
+ this[ type ]() :
+ null;
+ };
+
+ jQuery.fn[ type ] = function( value ) {
+ return jQuery.access( this, function( elem, type, value ) {
+ var doc, docElemProp, orig, ret;
+
+ if ( jQuery.isWindow( elem ) ) {
+ // 3rd condition allows Nokia support, as it supports the docElem prop but not CSS1Compat
+ doc = elem.document;
+ docElemProp = doc.documentElement[ clientProp ];
+ return jQuery.support.boxModel && docElemProp ||
+ doc.body && doc.body[ clientProp ] || docElemProp;
+ }
+
+ // Get document width or height
+ if ( elem.nodeType === 9 ) {
+ // Either scroll[Width/Height] or offset[Width/Height], whichever is greater
+ doc = elem.documentElement;
+
+ // when a window > document, IE6 reports a offset[Width/Height] > client[Width/Height]
+ // so we can't use max, as it'll choose the incorrect offset[Width/Height]
+ // instead we use the correct client[Width/Height]
+ // support:IE6
+ if ( doc[ clientProp ] >= doc[ scrollProp ] ) {
+ return doc[ clientProp ];
+ }
+
+ return Math.max(
+ elem.body[ scrollProp ], doc[ scrollProp ],
+ elem.body[ offsetProp ], doc[ offsetProp ]
+ );
+ }
+
+ // Get width or height on the element
+ if ( value === undefined ) {
+ orig = jQuery.css( elem, type );
+ ret = parseFloat( orig );
+ return jQuery.isNumeric( ret ) ? ret : orig;
+ }
+
+ // Set the width or height on the element
+ jQuery( elem ).css( type, value );
+ }, type, value, arguments.length, null );
+ };
+});
+
+
+
+
+// Expose jQuery to the global object
+window.jQuery = window.$ = jQuery;
+
+// Expose jQuery as an AMD module, but only for AMD loaders that
+// understand the issues with loading multiple versions of jQuery
+// in a page that all might call define(). The loader will indicate
+// they have special allowances for multiple jQuery versions by
+// specifying define.amd.jQuery = true. Register as a named module,
+// since jQuery can be concatenated with other files that may use define,
+// but not use a proper concatenation script that understands anonymous
+// AMD modules. A named AMD is safest and most robust way to register.
+// Lowercase jquery is used because AMD module names are derived from
+// file names, and jQuery is normally delivered in a lowercase file name.
+// Do this after creating the global so that if an AMD module wants to call
+// noConflict to hide this version of jQuery, it will work.
+if ( typeof define === "function" && define.amd && define.amd.jQuery ) {
+ define( "jquery", [], function () { return jQuery; } );
+}
+
+
+
+})( window );
Added: www-releases/trunk/3.8.0/projects/libcxx/docs/_static/minus.png
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/minus.png?rev=262945&view=auto
==============================================================================
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URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/plus.png?rev=262945&view=auto
==============================================================================
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Added: www-releases/trunk/3.8.0/projects/libcxx/docs/_static/pygments.css
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/pygments.css?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/projects/libcxx/docs/_static/pygments.css (added)
+++ www-releases/trunk/3.8.0/projects/libcxx/docs/_static/pygments.css Tue Mar 8 12:28:17 2016
@@ -0,0 +1,62 @@
+.highlight .hll { background-color: #ffffcc }
+.highlight { background: #f0f0f0; }
+.highlight .c { color: #60a0b0; font-style: italic } /* Comment */
+.highlight .err { border: 1px solid #FF0000 } /* Error */
+.highlight .k { color: #007020; font-weight: bold } /* Keyword */
+.highlight .o { color: #666666 } /* Operator */
+.highlight .cm { color: #60a0b0; font-style: italic } /* Comment.Multiline */
+.highlight .cp { color: #007020 } /* Comment.Preproc */
+.highlight .c1 { color: #60a0b0; font-style: italic } /* Comment.Single */
+.highlight .cs { color: #60a0b0; background-color: #fff0f0 } /* Comment.Special */
+.highlight .gd { color: #A00000 } /* Generic.Deleted */
+.highlight .ge { font-style: italic } /* Generic.Emph */
+.highlight .gr { color: #FF0000 } /* Generic.Error */
+.highlight .gh { color: #000080; font-weight: bold } /* Generic.Heading */
+.highlight .gi { color: #00A000 } /* Generic.Inserted */
+.highlight .go { color: #888888 } /* Generic.Output */
+.highlight .gp { color: #c65d09; font-weight: bold } /* Generic.Prompt */
+.highlight .gs { font-weight: bold } /* Generic.Strong */
+.highlight .gu { color: #800080; font-weight: bold } /* Generic.Subheading */
+.highlight .gt { color: #0044DD } /* Generic.Traceback */
+.highlight .kc { color: #007020; font-weight: bold } /* Keyword.Constant */
+.highlight .kd { color: #007020; font-weight: bold } /* Keyword.Declaration */
+.highlight .kn { color: #007020; font-weight: bold } /* Keyword.Namespace */
+.highlight .kp { color: #007020 } /* Keyword.Pseudo */
+.highlight .kr { color: #007020; font-weight: bold } /* Keyword.Reserved */
+.highlight .kt { color: #902000 } /* Keyword.Type */
+.highlight .m { color: #40a070 } /* Literal.Number */
+.highlight .s { color: #4070a0 } /* Literal.String */
+.highlight .na { color: #4070a0 } /* Name.Attribute */
+.highlight .nb { color: #007020 } /* Name.Builtin */
+.highlight .nc { color: #0e84b5; font-weight: bold } /* Name.Class */
+.highlight .no { color: #60add5 } /* Name.Constant */
+.highlight .nd { color: #555555; font-weight: bold } /* Name.Decorator */
+.highlight .ni { color: #d55537; font-weight: bold } /* Name.Entity */
+.highlight .ne { color: #007020 } /* Name.Exception */
+.highlight .nf { color: #06287e } /* Name.Function */
+.highlight .nl { color: #002070; font-weight: bold } /* Name.Label */
+.highlight .nn { color: #0e84b5; font-weight: bold } /* Name.Namespace */
+.highlight .nt { color: #062873; font-weight: bold } /* Name.Tag */
+.highlight .nv { color: #bb60d5 } /* Name.Variable */
+.highlight .ow { color: #007020; font-weight: bold } /* Operator.Word */
+.highlight .w { color: #bbbbbb } /* Text.Whitespace */
+.highlight .mf { color: #40a070 } /* Literal.Number.Float */
+.highlight .mh { color: #40a070 } /* Literal.Number.Hex */
+.highlight .mi { color: #40a070 } /* Literal.Number.Integer */
+.highlight .mo { color: #40a070 } /* Literal.Number.Oct */
+.highlight .sb { color: #4070a0 } /* Literal.String.Backtick */
+.highlight .sc { color: #4070a0 } /* Literal.String.Char */
+.highlight .sd { color: #4070a0; font-style: italic } /* Literal.String.Doc */
+.highlight .s2 { color: #4070a0 } /* Literal.String.Double */
+.highlight .se { color: #4070a0; font-weight: bold } /* Literal.String.Escape */
+.highlight .sh { color: #4070a0 } /* Literal.String.Heredoc */
+.highlight .si { color: #70a0d0; font-style: italic } /* Literal.String.Interpol */
+.highlight .sx { color: #c65d09 } /* Literal.String.Other */
+.highlight .sr { color: #235388 } /* Literal.String.Regex */
+.highlight .s1 { color: #4070a0 } /* Literal.String.Single */
+.highlight .ss { color: #517918 } /* Literal.String.Symbol */
+.highlight .bp { color: #007020 } /* Name.Builtin.Pseudo */
+.highlight .vc { color: #bb60d5 } /* Name.Variable.Class */
+.highlight .vg { color: #bb60d5 } /* Name.Variable.Global */
+.highlight .vi { color: #bb60d5 } /* Name.Variable.Instance */
+.highlight .il { color: #40a070 } /* Literal.Number.Integer.Long */
\ No newline at end of file
Added: www-releases/trunk/3.8.0/projects/libcxx/docs/_static/searchtools.js
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/searchtools.js?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/projects/libcxx/docs/_static/searchtools.js (added)
+++ www-releases/trunk/3.8.0/projects/libcxx/docs/_static/searchtools.js Tue Mar 8 12:28:17 2016
@@ -0,0 +1,622 @@
+/*
+ * searchtools.js_t
+ * ~~~~~~~~~~~~~~~~
+ *
+ * Sphinx JavaScript utilties for the full-text search.
+ *
+ * :copyright: Copyright 2007-2014 by the Sphinx team, see AUTHORS.
+ * :license: BSD, see LICENSE for details.
+ *
+ */
+
+
+/**
+ * Porter Stemmer
+ */
+var Stemmer = function() {
+
+ var step2list = {
+ ational: 'ate',
+ tional: 'tion',
+ enci: 'ence',
+ anci: 'ance',
+ izer: 'ize',
+ bli: 'ble',
+ alli: 'al',
+ entli: 'ent',
+ eli: 'e',
+ ousli: 'ous',
+ ization: 'ize',
+ ation: 'ate',
+ ator: 'ate',
+ alism: 'al',
+ iveness: 'ive',
+ fulness: 'ful',
+ ousness: 'ous',
+ aliti: 'al',
+ iviti: 'ive',
+ biliti: 'ble',
+ logi: 'log'
+ };
+
+ var step3list = {
+ icate: 'ic',
+ ative: '',
+ alize: 'al',
+ iciti: 'ic',
+ ical: 'ic',
+ ful: '',
+ ness: ''
+ };
+
+ var c = "[^aeiou]"; // consonant
+ var v = "[aeiouy]"; // vowel
+ var C = c + "[^aeiouy]*"; // consonant sequence
+ var V = v + "[aeiou]*"; // vowel sequence
+
+ var mgr0 = "^(" + C + ")?" + V + C; // [C]VC... is m>0
+ var meq1 = "^(" + C + ")?" + V + C + "(" + V + ")?$"; // [C]VC[V] is m=1
+ var mgr1 = "^(" + C + ")?" + V + C + V + C; // [C]VCVC... is m>1
+ var s_v = "^(" + C + ")?" + v; // vowel in stem
+
+ this.stemWord = function (w) {
+ var stem;
+ var suffix;
+ var firstch;
+ var origword = w;
+
+ if (w.length < 3)
+ return w;
+
+ var re;
+ var re2;
+ var re3;
+ var re4;
+
+ firstch = w.substr(0,1);
+ if (firstch == "y")
+ w = firstch.toUpperCase() + w.substr(1);
+
+ // Step 1a
+ re = /^(.+?)(ss|i)es$/;
+ re2 = /^(.+?)([^s])s$/;
+
+ if (re.test(w))
+ w = w.replace(re,"$1$2");
+ else if (re2.test(w))
+ w = w.replace(re2,"$1$2");
+
+ // Step 1b
+ re = /^(.+?)eed$/;
+ re2 = /^(.+?)(ed|ing)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ re = new RegExp(mgr0);
+ if (re.test(fp[1])) {
+ re = /.$/;
+ w = w.replace(re,"");
+ }
+ }
+ else if (re2.test(w)) {
+ var fp = re2.exec(w);
+ stem = fp[1];
+ re2 = new RegExp(s_v);
+ if (re2.test(stem)) {
+ w = stem;
+ re2 = /(at|bl|iz)$/;
+ re3 = new RegExp("([^aeiouylsz])\\1$");
+ re4 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+ if (re2.test(w))
+ w = w + "e";
+ else if (re3.test(w)) {
+ re = /.$/;
+ w = w.replace(re,"");
+ }
+ else if (re4.test(w))
+ w = w + "e";
+ }
+ }
+
+ // Step 1c
+ re = /^(.+?)y$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ re = new RegExp(s_v);
+ if (re.test(stem))
+ w = stem + "i";
+ }
+
+ // Step 2
+ re = /^(.+?)(ational|tional|enci|anci|izer|bli|alli|entli|eli|ousli|ization|ation|ator|alism|iveness|fulness|ousness|aliti|iviti|biliti|logi)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ suffix = fp[2];
+ re = new RegExp(mgr0);
+ if (re.test(stem))
+ w = stem + step2list[suffix];
+ }
+
+ // Step 3
+ re = /^(.+?)(icate|ative|alize|iciti|ical|ful|ness)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ suffix = fp[2];
+ re = new RegExp(mgr0);
+ if (re.test(stem))
+ w = stem + step3list[suffix];
+ }
+
+ // Step 4
+ re = /^(.+?)(al|ance|ence|er|ic|able|ible|ant|ement|ment|ent|ou|ism|ate|iti|ous|ive|ize)$/;
+ re2 = /^(.+?)(s|t)(ion)$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ re = new RegExp(mgr1);
+ if (re.test(stem))
+ w = stem;
+ }
+ else if (re2.test(w)) {
+ var fp = re2.exec(w);
+ stem = fp[1] + fp[2];
+ re2 = new RegExp(mgr1);
+ if (re2.test(stem))
+ w = stem;
+ }
+
+ // Step 5
+ re = /^(.+?)e$/;
+ if (re.test(w)) {
+ var fp = re.exec(w);
+ stem = fp[1];
+ re = new RegExp(mgr1);
+ re2 = new RegExp(meq1);
+ re3 = new RegExp("^" + C + v + "[^aeiouwxy]$");
+ if (re.test(stem) || (re2.test(stem) && !(re3.test(stem))))
+ w = stem;
+ }
+ re = /ll$/;
+ re2 = new RegExp(mgr1);
+ if (re.test(w) && re2.test(w)) {
+ re = /.$/;
+ w = w.replace(re,"");
+ }
+
+ // and turn initial Y back to y
+ if (firstch == "y")
+ w = firstch.toLowerCase() + w.substr(1);
+ return w;
+ }
+}
+
+
+
+/**
+ * Simple result scoring code.
+ */
+var Scorer = {
+ // Implement the following function to further tweak the score for each result
+ // The function takes a result array [filename, title, anchor, descr, score]
+ // and returns the new score.
+ /*
+ score: function(result) {
+ return result[4];
+ },
+ */
+
+ // query matches the full name of an object
+ objNameMatch: 11,
+ // or matches in the last dotted part of the object name
+ objPartialMatch: 6,
+ // Additive scores depending on the priority of the object
+ objPrio: {0: 15, // used to be importantResults
+ 1: 5, // used to be objectResults
+ 2: -5}, // used to be unimportantResults
+ // Used when the priority is not in the mapping.
+ objPrioDefault: 0,
+
+ // query found in title
+ title: 15,
+ // query found in terms
+ term: 5
+};
+
+
+/**
+ * Search Module
+ */
+var Search = {
+
+ _index : null,
+ _queued_query : null,
+ _pulse_status : -1,
+
+ init : function() {
+ var params = $.getQueryParameters();
+ if (params.q) {
+ var query = params.q[0];
+ $('input[name="q"]')[0].value = query;
+ this.performSearch(query);
+ }
+ },
+
+ loadIndex : function(url) {
+ $.ajax({type: "GET", url: url, data: null,
+ dataType: "script", cache: true,
+ complete: function(jqxhr, textstatus) {
+ if (textstatus != "success") {
+ document.getElementById("searchindexloader").src = url;
+ }
+ }});
+ },
+
+ setIndex : function(index) {
+ var q;
+ this._index = index;
+ if ((q = this._queued_query) !== null) {
+ this._queued_query = null;
+ Search.query(q);
+ }
+ },
+
+ hasIndex : function() {
+ return this._index !== null;
+ },
+
+ deferQuery : function(query) {
+ this._queued_query = query;
+ },
+
+ stopPulse : function() {
+ this._pulse_status = 0;
+ },
+
+ startPulse : function() {
+ if (this._pulse_status >= 0)
+ return;
+ function pulse() {
+ var i;
+ Search._pulse_status = (Search._pulse_status + 1) % 4;
+ var dotString = '';
+ for (i = 0; i < Search._pulse_status; i++)
+ dotString += '.';
+ Search.dots.text(dotString);
+ if (Search._pulse_status > -1)
+ window.setTimeout(pulse, 500);
+ }
+ pulse();
+ },
+
+ /**
+ * perform a search for something (or wait until index is loaded)
+ */
+ performSearch : function(query) {
+ // create the required interface elements
+ this.out = $('#search-results');
+ this.title = $('<h2>' + _('Searching') + '</h2>').appendTo(this.out);
+ this.dots = $('<span></span>').appendTo(this.title);
+ this.status = $('<p style="display: none"></p>').appendTo(this.out);
+ this.output = $('<ul class="search"/>').appendTo(this.out);
+
+ $('#search-progress').text(_('Preparing search...'));
+ this.startPulse();
+
+ // index already loaded, the browser was quick!
+ if (this.hasIndex())
+ this.query(query);
+ else
+ this.deferQuery(query);
+ },
+
+ /**
+ * execute search (requires search index to be loaded)
+ */
+ query : function(query) {
+ var i;
+ var stopwords = ["a","and","are","as","at","be","but","by","for","if","in","into","is","it","near","no","not","of","on","or","such","that","the","their","then","there","these","they","this","to","was","will","with"];
+
+ // stem the searchterms and add them to the correct list
+ var stemmer = new Stemmer();
+ var searchterms = [];
+ var excluded = [];
+ var hlterms = [];
+ var tmp = query.split(/\s+/);
+ var objectterms = [];
+ for (i = 0; i < tmp.length; i++) {
+ if (tmp[i] !== "") {
+ objectterms.push(tmp[i].toLowerCase());
+ }
+
+ if ($u.indexOf(stopwords, tmp[i].toLowerCase()) != -1 || tmp[i].match(/^\d+$/) ||
+ tmp[i] === "") {
+ // skip this "word"
+ continue;
+ }
+ // stem the word
+ var word = stemmer.stemWord(tmp[i].toLowerCase());
+ var toAppend;
+ // select the correct list
+ if (word[0] == '-') {
+ toAppend = excluded;
+ word = word.substr(1);
+ }
+ else {
+ toAppend = searchterms;
+ hlterms.push(tmp[i].toLowerCase());
+ }
+ // only add if not already in the list
+ if (!$u.contains(toAppend, word))
+ toAppend.push(word);
+ }
+ var highlightstring = '?highlight=' + $.urlencode(hlterms.join(" "));
+
+ // console.debug('SEARCH: searching for:');
+ // console.info('required: ', searchterms);
+ // console.info('excluded: ', excluded);
+
+ // prepare search
+ var terms = this._index.terms;
+ var titleterms = this._index.titleterms;
+
+ // array of [filename, title, anchor, descr, score]
+ var results = [];
+ $('#search-progress').empty();
+
+ // lookup as object
+ for (i = 0; i < objectterms.length; i++) {
+ var others = [].concat(objectterms.slice(0, i),
+ objectterms.slice(i+1, objectterms.length));
+ results = results.concat(this.performObjectSearch(objectterms[i], others));
+ }
+
+ // lookup as search terms in fulltext
+ results = results.concat(this.performTermsSearch(searchterms, excluded, terms, Scorer.term))
+ .concat(this.performTermsSearch(searchterms, excluded, titleterms, Scorer.title));
+
+ // let the scorer override scores with a custom scoring function
+ if (Scorer.score) {
+ for (i = 0; i < results.length; i++)
+ results[i][4] = Scorer.score(results[i]);
+ }
+
+ // now sort the results by score (in opposite order of appearance, since the
+ // display function below uses pop() to retrieve items) and then
+ // alphabetically
+ results.sort(function(a, b) {
+ var left = a[4];
+ var right = b[4];
+ if (left > right) {
+ return 1;
+ } else if (left < right) {
+ return -1;
+ } else {
+ // same score: sort alphabetically
+ left = a[1].toLowerCase();
+ right = b[1].toLowerCase();
+ return (left > right) ? -1 : ((left < right) ? 1 : 0);
+ }
+ });
+
+ // for debugging
+ //Search.lastresults = results.slice(); // a copy
+ //console.info('search results:', Search.lastresults);
+
+ // print the results
+ var resultCount = results.length;
+ function displayNextItem() {
+ // results left, load the summary and display it
+ if (results.length) {
+ var item = results.pop();
+ var listItem = $('<li style="display:none"></li>');
+ if (DOCUMENTATION_OPTIONS.FILE_SUFFIX === '') {
+ // dirhtml builder
+ var dirname = item[0] + '/';
+ if (dirname.match(/\/index\/$/)) {
+ dirname = dirname.substring(0, dirname.length-6);
+ } else if (dirname == 'index/') {
+ dirname = '';
+ }
+ listItem.append($('<a/>').attr('href',
+ DOCUMENTATION_OPTIONS.URL_ROOT + dirname +
+ highlightstring + item[2]).html(item[1]));
+ } else {
+ // normal html builders
+ listItem.append($('<a/>').attr('href',
+ item[0] + DOCUMENTATION_OPTIONS.FILE_SUFFIX +
+ highlightstring + item[2]).html(item[1]));
+ }
+ if (item[3]) {
+ listItem.append($('<span> (' + item[3] + ')</span>'));
+ Search.output.append(listItem);
+ listItem.slideDown(5, function() {
+ displayNextItem();
+ });
+ } else if (DOCUMENTATION_OPTIONS.HAS_SOURCE) {
+ $.ajax({url: DOCUMENTATION_OPTIONS.URL_ROOT + '_sources/' + item[0] + '.txt',
+ dataType: "text",
+ complete: function(jqxhr, textstatus) {
+ var data = jqxhr.responseText;
+ if (data !== '') {
+ listItem.append(Search.makeSearchSummary(data, searchterms, hlterms));
+ }
+ Search.output.append(listItem);
+ listItem.slideDown(5, function() {
+ displayNextItem();
+ });
+ }});
+ } else {
+ // no source available, just display title
+ Search.output.append(listItem);
+ listItem.slideDown(5, function() {
+ displayNextItem();
+ });
+ }
+ }
+ // search finished, update title and status message
+ else {
+ Search.stopPulse();
+ Search.title.text(_('Search Results'));
+ if (!resultCount)
+ Search.status.text(_('Your search did not match any documents. Please make sure that all words are spelled correctly and that you\'ve selected enough categories.'));
+ else
+ Search.status.text(_('Search finished, found %s page(s) matching the search query.').replace('%s', resultCount));
+ Search.status.fadeIn(500);
+ }
+ }
+ displayNextItem();
+ },
+
+ /**
+ * search for object names
+ */
+ performObjectSearch : function(object, otherterms) {
+ var filenames = this._index.filenames;
+ var objects = this._index.objects;
+ var objnames = this._index.objnames;
+ var titles = this._index.titles;
+
+ var i;
+ var results = [];
+
+ for (var prefix in objects) {
+ for (var name in objects[prefix]) {
+ var fullname = (prefix ? prefix + '.' : '') + name;
+ if (fullname.toLowerCase().indexOf(object) > -1) {
+ var score = 0;
+ var parts = fullname.split('.');
+ // check for different match types: exact matches of full name or
+ // "last name" (i.e. last dotted part)
+ if (fullname == object || parts[parts.length - 1] == object) {
+ score += Scorer.objNameMatch;
+ // matches in last name
+ } else if (parts[parts.length - 1].indexOf(object) > -1) {
+ score += Scorer.objPartialMatch;
+ }
+ var match = objects[prefix][name];
+ var objname = objnames[match[1]][2];
+ var title = titles[match[0]];
+ // If more than one term searched for, we require other words to be
+ // found in the name/title/description
+ if (otherterms.length > 0) {
+ var haystack = (prefix + ' ' + name + ' ' +
+ objname + ' ' + title).toLowerCase();
+ var allfound = true;
+ for (i = 0; i < otherterms.length; i++) {
+ if (haystack.indexOf(otherterms[i]) == -1) {
+ allfound = false;
+ break;
+ }
+ }
+ if (!allfound) {
+ continue;
+ }
+ }
+ var descr = objname + _(', in ') + title;
+
+ var anchor = match[3];
+ if (anchor === '')
+ anchor = fullname;
+ else if (anchor == '-')
+ anchor = objnames[match[1]][1] + '-' + fullname;
+ // add custom score for some objects according to scorer
+ if (Scorer.objPrio.hasOwnProperty(match[2])) {
+ score += Scorer.objPrio[match[2]];
+ } else {
+ score += Scorer.objPrioDefault;
+ }
+ results.push([filenames[match[0]], fullname, '#'+anchor, descr, score]);
+ }
+ }
+ }
+
+ return results;
+ },
+
+ /**
+ * search for full-text terms in the index
+ */
+ performTermsSearch : function(searchterms, excluded, terms, score) {
+ var filenames = this._index.filenames;
+ var titles = this._index.titles;
+
+ var i, j, file, files;
+ var fileMap = {};
+ var results = [];
+
+ // perform the search on the required terms
+ for (i = 0; i < searchterms.length; i++) {
+ var word = searchterms[i];
+ // no match but word was a required one
+ if ((files = terms[word]) === undefined)
+ break;
+ if (files.length === undefined) {
+ files = [files];
+ }
+ // create the mapping
+ for (j = 0; j < files.length; j++) {
+ file = files[j];
+ if (file in fileMap)
+ fileMap[file].push(word);
+ else
+ fileMap[file] = [word];
+ }
+ }
+
+ // now check if the files don't contain excluded terms
+ for (file in fileMap) {
+ var valid = true;
+
+ // check if all requirements are matched
+ if (fileMap[file].length != searchterms.length)
+ continue;
+
+ // ensure that none of the excluded terms is in the search result
+ for (i = 0; i < excluded.length; i++) {
+ if (terms[excluded[i]] == file ||
+ $u.contains(terms[excluded[i]] || [], file)) {
+ valid = false;
+ break;
+ }
+ }
+
+ // if we have still a valid result we can add it to the result list
+ if (valid) {
+ results.push([filenames[file], titles[file], '', null, score]);
+ }
+ }
+ return results;
+ },
+
+ /**
+ * helper function to return a node containing the
+ * search summary for a given text. keywords is a list
+ * of stemmed words, hlwords is the list of normal, unstemmed
+ * words. the first one is used to find the occurance, the
+ * latter for highlighting it.
+ */
+ makeSearchSummary : function(text, keywords, hlwords) {
+ var textLower = text.toLowerCase();
+ var start = 0;
+ $.each(keywords, function() {
+ var i = textLower.indexOf(this.toLowerCase());
+ if (i > -1)
+ start = i;
+ });
+ start = Math.max(start - 120, 0);
+ var excerpt = ((start > 0) ? '...' : '') +
+ $.trim(text.substr(start, 240)) +
+ ((start + 240 - text.length) ? '...' : '');
+ var rv = $('<div class="context"></div>').text(excerpt);
+ $.each(hlwords, function() {
+ rv = rv.highlightText(this, 'highlighted');
+ });
+ return rv;
+ }
+};
+
+$(document).ready(function() {
+ Search.init();
+});
\ No newline at end of file
Added: www-releases/trunk/3.8.0/projects/libcxx/docs/_static/underscore.js
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/underscore.js?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/projects/libcxx/docs/_static/underscore.js (added)
+++ www-releases/trunk/3.8.0/projects/libcxx/docs/_static/underscore.js Tue Mar 8 12:28:17 2016
@@ -0,0 +1,1226 @@
+// Underscore.js 1.4.4
+// http://underscorejs.org
+// (c) 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.
+// Underscore may be freely distributed under the MIT license.
+
+(function() {
+
+ // Baseline setup
+ // --------------
+
+ // Establish the root object, `window` in the browser, or `global` on the server.
+ var root = this;
+
+ // Save the previous value of the `_` variable.
+ var previousUnderscore = root._;
+
+ // Establish the object that gets returned to break out of a loop iteration.
+ var breaker = {};
+
+ // Save bytes in the minified (but not gzipped) version:
+ var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;
+
+ // Create quick reference variables for speed access to core prototypes.
+ var push = ArrayProto.push,
+ slice = ArrayProto.slice,
+ concat = ArrayProto.concat,
+ toString = ObjProto.toString,
+ hasOwnProperty = ObjProto.hasOwnProperty;
+
+ // All **ECMAScript 5** native function implementations that we hope to use
+ // are declared here.
+ var
+ nativeForEach = ArrayProto.forEach,
+ nativeMap = ArrayProto.map,
+ nativeReduce = ArrayProto.reduce,
+ nativeReduceRight = ArrayProto.reduceRight,
+ nativeFilter = ArrayProto.filter,
+ nativeEvery = ArrayProto.every,
+ nativeSome = ArrayProto.some,
+ nativeIndexOf = ArrayProto.indexOf,
+ nativeLastIndexOf = ArrayProto.lastIndexOf,
+ nativeIsArray = Array.isArray,
+ nativeKeys = Object.keys,
+ nativeBind = FuncProto.bind;
+
+ // Create a safe reference to the Underscore object for use below.
+ var _ = function(obj) {
+ if (obj instanceof _) return obj;
+ if (!(this instanceof _)) return new _(obj);
+ this._wrapped = obj;
+ };
+
+ // Export the Underscore object for **Node.js**, with
+ // backwards-compatibility for the old `require()` API. If we're in
+ // the browser, add `_` as a global object via a string identifier,
+ // for Closure Compiler "advanced" mode.
+ if (typeof exports !== 'undefined') {
+ if (typeof module !== 'undefined' && module.exports) {
+ exports = module.exports = _;
+ }
+ exports._ = _;
+ } else {
+ root._ = _;
+ }
+
+ // Current version.
+ _.VERSION = '1.4.4';
+
+ // Collection Functions
+ // --------------------
+
+ // The cornerstone, an `each` implementation, aka `forEach`.
+ // Handles objects with the built-in `forEach`, arrays, and raw objects.
+ // Delegates to **ECMAScript 5**'s native `forEach` if available.
+ var each = _.each = _.forEach = function(obj, iterator, context) {
+ if (obj == null) return;
+ if (nativeForEach && obj.forEach === nativeForEach) {
+ obj.forEach(iterator, context);
+ } else if (obj.length === +obj.length) {
+ for (var i = 0, l = obj.length; i < l; i++) {
+ if (iterator.call(context, obj[i], i, obj) === breaker) return;
+ }
+ } else {
+ for (var key in obj) {
+ if (_.has(obj, key)) {
+ if (iterator.call(context, obj[key], key, obj) === breaker) return;
+ }
+ }
+ }
+ };
+
+ // Return the results of applying the iterator to each element.
+ // Delegates to **ECMAScript 5**'s native `map` if available.
+ _.map = _.collect = function(obj, iterator, context) {
+ var results = [];
+ if (obj == null) return results;
+ if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context);
+ each(obj, function(value, index, list) {
+ results[results.length] = iterator.call(context, value, index, list);
+ });
+ return results;
+ };
+
+ var reduceError = 'Reduce of empty array with no initial value';
+
+ // **Reduce** builds up a single result from a list of values, aka `inject`,
+ // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
+ _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
+ var initial = arguments.length > 2;
+ if (obj == null) obj = [];
+ if (nativeReduce && obj.reduce === nativeReduce) {
+ if (context) iterator = _.bind(iterator, context);
+ return initial ? obj.reduce(iterator, memo) : obj.reduce(iterator);
+ }
+ each(obj, function(value, index, list) {
+ if (!initial) {
+ memo = value;
+ initial = true;
+ } else {
+ memo = iterator.call(context, memo, value, index, list);
+ }
+ });
+ if (!initial) throw new TypeError(reduceError);
+ return memo;
+ };
+
+ // The right-associative version of reduce, also known as `foldr`.
+ // Delegates to **ECMAScript 5**'s native `reduceRight` if available.
+ _.reduceRight = _.foldr = function(obj, iterator, memo, context) {
+ var initial = arguments.length > 2;
+ if (obj == null) obj = [];
+ if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
+ if (context) iterator = _.bind(iterator, context);
+ return initial ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
+ }
+ var length = obj.length;
+ if (length !== +length) {
+ var keys = _.keys(obj);
+ length = keys.length;
+ }
+ each(obj, function(value, index, list) {
+ index = keys ? keys[--length] : --length;
+ if (!initial) {
+ memo = obj[index];
+ initial = true;
+ } else {
+ memo = iterator.call(context, memo, obj[index], index, list);
+ }
+ });
+ if (!initial) throw new TypeError(reduceError);
+ return memo;
+ };
+
+ // Return the first value which passes a truth test. Aliased as `detect`.
+ _.find = _.detect = function(obj, iterator, context) {
+ var result;
+ any(obj, function(value, index, list) {
+ if (iterator.call(context, value, index, list)) {
+ result = value;
+ return true;
+ }
+ });
+ return result;
+ };
+
+ // Return all the elements that pass a truth test.
+ // Delegates to **ECMAScript 5**'s native `filter` if available.
+ // Aliased as `select`.
+ _.filter = _.select = function(obj, iterator, context) {
+ var results = [];
+ if (obj == null) return results;
+ if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context);
+ each(obj, function(value, index, list) {
+ if (iterator.call(context, value, index, list)) results[results.length] = value;
+ });
+ return results;
+ };
+
+ // Return all the elements for which a truth test fails.
+ _.reject = function(obj, iterator, context) {
+ return _.filter(obj, function(value, index, list) {
+ return !iterator.call(context, value, index, list);
+ }, context);
+ };
+
+ // Determine whether all of the elements match a truth test.
+ // Delegates to **ECMAScript 5**'s native `every` if available.
+ // Aliased as `all`.
+ _.every = _.all = function(obj, iterator, context) {
+ iterator || (iterator = _.identity);
+ var result = true;
+ if (obj == null) return result;
+ if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
+ each(obj, function(value, index, list) {
+ if (!(result = result && iterator.call(context, value, index, list))) return breaker;
+ });
+ return !!result;
+ };
+
+ // Determine if at least one element in the object matches a truth test.
+ // Delegates to **ECMAScript 5**'s native `some` if available.
+ // Aliased as `any`.
+ var any = _.some = _.any = function(obj, iterator, context) {
+ iterator || (iterator = _.identity);
+ var result = false;
+ if (obj == null) return result;
+ if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
+ each(obj, function(value, index, list) {
+ if (result || (result = iterator.call(context, value, index, list))) return breaker;
+ });
+ return !!result;
+ };
+
+ // Determine if the array or object contains a given value (using `===`).
+ // Aliased as `include`.
+ _.contains = _.include = function(obj, target) {
+ if (obj == null) return false;
+ if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
+ return any(obj, function(value) {
+ return value === target;
+ });
+ };
+
+ // Invoke a method (with arguments) on every item in a collection.
+ _.invoke = function(obj, method) {
+ var args = slice.call(arguments, 2);
+ var isFunc = _.isFunction(method);
+ return _.map(obj, function(value) {
+ return (isFunc ? method : value[method]).apply(value, args);
+ });
+ };
+
+ // Convenience version of a common use case of `map`: fetching a property.
+ _.pluck = function(obj, key) {
+ return _.map(obj, function(value){ return value[key]; });
+ };
+
+ // Convenience version of a common use case of `filter`: selecting only objects
+ // containing specific `key:value` pairs.
+ _.where = function(obj, attrs, first) {
+ if (_.isEmpty(attrs)) return first ? null : [];
+ return _[first ? 'find' : 'filter'](obj, function(value) {
+ for (var key in attrs) {
+ if (attrs[key] !== value[key]) return false;
+ }
+ return true;
+ });
+ };
+
+ // Convenience version of a common use case of `find`: getting the first object
+ // containing specific `key:value` pairs.
+ _.findWhere = function(obj, attrs) {
+ return _.where(obj, attrs, true);
+ };
+
+ // Return the maximum element or (element-based computation).
+ // Can't optimize arrays of integers longer than 65,535 elements.
+ // See: https://bugs.webkit.org/show_bug.cgi?id=80797
+ _.max = function(obj, iterator, context) {
+ if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
+ return Math.max.apply(Math, obj);
+ }
+ if (!iterator && _.isEmpty(obj)) return -Infinity;
+ var result = {computed : -Infinity, value: -Infinity};
+ each(obj, function(value, index, list) {
+ var computed = iterator ? iterator.call(context, value, index, list) : value;
+ computed >= result.computed && (result = {value : value, computed : computed});
+ });
+ return result.value;
+ };
+
+ // Return the minimum element (or element-based computation).
+ _.min = function(obj, iterator, context) {
+ if (!iterator && _.isArray(obj) && obj[0] === +obj[0] && obj.length < 65535) {
+ return Math.min.apply(Math, obj);
+ }
+ if (!iterator && _.isEmpty(obj)) return Infinity;
+ var result = {computed : Infinity, value: Infinity};
+ each(obj, function(value, index, list) {
+ var computed = iterator ? iterator.call(context, value, index, list) : value;
+ computed < result.computed && (result = {value : value, computed : computed});
+ });
+ return result.value;
+ };
+
+ // Shuffle an array.
+ _.shuffle = function(obj) {
+ var rand;
+ var index = 0;
+ var shuffled = [];
+ each(obj, function(value) {
+ rand = _.random(index++);
+ shuffled[index - 1] = shuffled[rand];
+ shuffled[rand] = value;
+ });
+ return shuffled;
+ };
+
+ // An internal function to generate lookup iterators.
+ var lookupIterator = function(value) {
+ return _.isFunction(value) ? value : function(obj){ return obj[value]; };
+ };
+
+ // Sort the object's values by a criterion produced by an iterator.
+ _.sortBy = function(obj, value, context) {
+ var iterator = lookupIterator(value);
+ return _.pluck(_.map(obj, function(value, index, list) {
+ return {
+ value : value,
+ index : index,
+ criteria : iterator.call(context, value, index, list)
+ };
+ }).sort(function(left, right) {
+ var a = left.criteria;
+ var b = right.criteria;
+ if (a !== b) {
+ if (a > b || a === void 0) return 1;
+ if (a < b || b === void 0) return -1;
+ }
+ return left.index < right.index ? -1 : 1;
+ }), 'value');
+ };
+
+ // An internal function used for aggregate "group by" operations.
+ var group = function(obj, value, context, behavior) {
+ var result = {};
+ var iterator = lookupIterator(value || _.identity);
+ each(obj, function(value, index) {
+ var key = iterator.call(context, value, index, obj);
+ behavior(result, key, value);
+ });
+ return result;
+ };
+
+ // Groups the object's values by a criterion. Pass either a string attribute
+ // to group by, or a function that returns the criterion.
+ _.groupBy = function(obj, value, context) {
+ return group(obj, value, context, function(result, key, value) {
+ (_.has(result, key) ? result[key] : (result[key] = [])).push(value);
+ });
+ };
+
+ // Counts instances of an object that group by a certain criterion. Pass
+ // either a string attribute to count by, or a function that returns the
+ // criterion.
+ _.countBy = function(obj, value, context) {
+ return group(obj, value, context, function(result, key) {
+ if (!_.has(result, key)) result[key] = 0;
+ result[key]++;
+ });
+ };
+
+ // Use a comparator function to figure out the smallest index at which
+ // an object should be inserted so as to maintain order. Uses binary search.
+ _.sortedIndex = function(array, obj, iterator, context) {
+ iterator = iterator == null ? _.identity : lookupIterator(iterator);
+ var value = iterator.call(context, obj);
+ var low = 0, high = array.length;
+ while (low < high) {
+ var mid = (low + high) >>> 1;
+ iterator.call(context, array[mid]) < value ? low = mid + 1 : high = mid;
+ }
+ return low;
+ };
+
+ // Safely convert anything iterable into a real, live array.
+ _.toArray = function(obj) {
+ if (!obj) return [];
+ if (_.isArray(obj)) return slice.call(obj);
+ if (obj.length === +obj.length) return _.map(obj, _.identity);
+ return _.values(obj);
+ };
+
+ // Return the number of elements in an object.
+ _.size = function(obj) {
+ if (obj == null) return 0;
+ return (obj.length === +obj.length) ? obj.length : _.keys(obj).length;
+ };
+
+ // Array Functions
+ // ---------------
+
+ // Get the first element of an array. Passing **n** will return the first N
+ // values in the array. Aliased as `head` and `take`. The **guard** check
+ // allows it to work with `_.map`.
+ _.first = _.head = _.take = function(array, n, guard) {
+ if (array == null) return void 0;
+ return (n != null) && !guard ? slice.call(array, 0, n) : array[0];
+ };
+
+ // Returns everything but the last entry of the array. Especially useful on
+ // the arguments object. Passing **n** will return all the values in
+ // the array, excluding the last N. The **guard** check allows it to work with
+ // `_.map`.
+ _.initial = function(array, n, guard) {
+ return slice.call(array, 0, array.length - ((n == null) || guard ? 1 : n));
+ };
+
+ // Get the last element of an array. Passing **n** will return the last N
+ // values in the array. The **guard** check allows it to work with `_.map`.
+ _.last = function(array, n, guard) {
+ if (array == null) return void 0;
+ if ((n != null) && !guard) {
+ return slice.call(array, Math.max(array.length - n, 0));
+ } else {
+ return array[array.length - 1];
+ }
+ };
+
+ // Returns everything but the first entry of the array. Aliased as `tail` and `drop`.
+ // Especially useful on the arguments object. Passing an **n** will return
+ // the rest N values in the array. The **guard**
+ // check allows it to work with `_.map`.
+ _.rest = _.tail = _.drop = function(array, n, guard) {
+ return slice.call(array, (n == null) || guard ? 1 : n);
+ };
+
+ // Trim out all falsy values from an array.
+ _.compact = function(array) {
+ return _.filter(array, _.identity);
+ };
+
+ // Internal implementation of a recursive `flatten` function.
+ var flatten = function(input, shallow, output) {
+ each(input, function(value) {
+ if (_.isArray(value)) {
+ shallow ? push.apply(output, value) : flatten(value, shallow, output);
+ } else {
+ output.push(value);
+ }
+ });
+ return output;
+ };
+
+ // Return a completely flattened version of an array.
+ _.flatten = function(array, shallow) {
+ return flatten(array, shallow, []);
+ };
+
+ // Return a version of the array that does not contain the specified value(s).
+ _.without = function(array) {
+ return _.difference(array, slice.call(arguments, 1));
+ };
+
+ // Produce a duplicate-free version of the array. If the array has already
+ // been sorted, you have the option of using a faster algorithm.
+ // Aliased as `unique`.
+ _.uniq = _.unique = function(array, isSorted, iterator, context) {
+ if (_.isFunction(isSorted)) {
+ context = iterator;
+ iterator = isSorted;
+ isSorted = false;
+ }
+ var initial = iterator ? _.map(array, iterator, context) : array;
+ var results = [];
+ var seen = [];
+ each(initial, function(value, index) {
+ if (isSorted ? (!index || seen[seen.length - 1] !== value) : !_.contains(seen, value)) {
+ seen.push(value);
+ results.push(array[index]);
+ }
+ });
+ return results;
+ };
+
+ // Produce an array that contains the union: each distinct element from all of
+ // the passed-in arrays.
+ _.union = function() {
+ return _.uniq(concat.apply(ArrayProto, arguments));
+ };
+
+ // Produce an array that contains every item shared between all the
+ // passed-in arrays.
+ _.intersection = function(array) {
+ var rest = slice.call(arguments, 1);
+ return _.filter(_.uniq(array), function(item) {
+ return _.every(rest, function(other) {
+ return _.indexOf(other, item) >= 0;
+ });
+ });
+ };
+
+ // Take the difference between one array and a number of other arrays.
+ // Only the elements present in just the first array will remain.
+ _.difference = function(array) {
+ var rest = concat.apply(ArrayProto, slice.call(arguments, 1));
+ return _.filter(array, function(value){ return !_.contains(rest, value); });
+ };
+
+ // Zip together multiple lists into a single array -- elements that share
+ // an index go together.
+ _.zip = function() {
+ var args = slice.call(arguments);
+ var length = _.max(_.pluck(args, 'length'));
+ var results = new Array(length);
+ for (var i = 0; i < length; i++) {
+ results[i] = _.pluck(args, "" + i);
+ }
+ return results;
+ };
+
+ // Converts lists into objects. Pass either a single array of `[key, value]`
+ // pairs, or two parallel arrays of the same length -- one of keys, and one of
+ // the corresponding values.
+ _.object = function(list, values) {
+ if (list == null) return {};
+ var result = {};
+ for (var i = 0, l = list.length; i < l; i++) {
+ if (values) {
+ result[list[i]] = values[i];
+ } else {
+ result[list[i][0]] = list[i][1];
+ }
+ }
+ return result;
+ };
+
+ // If the browser doesn't supply us with indexOf (I'm looking at you, **MSIE**),
+ // we need this function. Return the position of the first occurrence of an
+ // item in an array, or -1 if the item is not included in the array.
+ // Delegates to **ECMAScript 5**'s native `indexOf` if available.
+ // If the array is large and already in sort order, pass `true`
+ // for **isSorted** to use binary search.
+ _.indexOf = function(array, item, isSorted) {
+ if (array == null) return -1;
+ var i = 0, l = array.length;
+ if (isSorted) {
+ if (typeof isSorted == 'number') {
+ i = (isSorted < 0 ? Math.max(0, l + isSorted) : isSorted);
+ } else {
+ i = _.sortedIndex(array, item);
+ return array[i] === item ? i : -1;
+ }
+ }
+ if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item, isSorted);
+ for (; i < l; i++) if (array[i] === item) return i;
+ return -1;
+ };
+
+ // Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
+ _.lastIndexOf = function(array, item, from) {
+ if (array == null) return -1;
+ var hasIndex = from != null;
+ if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) {
+ return hasIndex ? array.lastIndexOf(item, from) : array.lastIndexOf(item);
+ }
+ var i = (hasIndex ? from : array.length);
+ while (i--) if (array[i] === item) return i;
+ return -1;
+ };
+
+ // Generate an integer Array containing an arithmetic progression. A port of
+ // the native Python `range()` function. See
+ // [the Python documentation](http://docs.python.org/library/functions.html#range).
+ _.range = function(start, stop, step) {
+ if (arguments.length <= 1) {
+ stop = start || 0;
+ start = 0;
+ }
+ step = arguments[2] || 1;
+
+ var len = Math.max(Math.ceil((stop - start) / step), 0);
+ var idx = 0;
+ var range = new Array(len);
+
+ while(idx < len) {
+ range[idx++] = start;
+ start += step;
+ }
+
+ return range;
+ };
+
+ // Function (ahem) Functions
+ // ------------------
+
+ // Create a function bound to a given object (assigning `this`, and arguments,
+ // optionally). Delegates to **ECMAScript 5**'s native `Function.bind` if
+ // available.
+ _.bind = function(func, context) {
+ if (func.bind === nativeBind && nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
+ var args = slice.call(arguments, 2);
+ return function() {
+ return func.apply(context, args.concat(slice.call(arguments)));
+ };
+ };
+
+ // Partially apply a function by creating a version that has had some of its
+ // arguments pre-filled, without changing its dynamic `this` context.
+ _.partial = function(func) {
+ var args = slice.call(arguments, 1);
+ return function() {
+ return func.apply(this, args.concat(slice.call(arguments)));
+ };
+ };
+
+ // Bind all of an object's methods to that object. Useful for ensuring that
+ // all callbacks defined on an object belong to it.
+ _.bindAll = function(obj) {
+ var funcs = slice.call(arguments, 1);
+ if (funcs.length === 0) funcs = _.functions(obj);
+ each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
+ return obj;
+ };
+
+ // Memoize an expensive function by storing its results.
+ _.memoize = function(func, hasher) {
+ var memo = {};
+ hasher || (hasher = _.identity);
+ return function() {
+ var key = hasher.apply(this, arguments);
+ return _.has(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments));
+ };
+ };
+
+ // Delays a function for the given number of milliseconds, and then calls
+ // it with the arguments supplied.
+ _.delay = function(func, wait) {
+ var args = slice.call(arguments, 2);
+ return setTimeout(function(){ return func.apply(null, args); }, wait);
+ };
+
+ // Defers a function, scheduling it to run after the current call stack has
+ // cleared.
+ _.defer = function(func) {
+ return _.delay.apply(_, [func, 1].concat(slice.call(arguments, 1)));
+ };
+
+ // Returns a function, that, when invoked, will only be triggered at most once
+ // during a given window of time.
+ _.throttle = function(func, wait) {
+ var context, args, timeout, result;
+ var previous = 0;
+ var later = function() {
+ previous = new Date;
+ timeout = null;
+ result = func.apply(context, args);
+ };
+ return function() {
+ var now = new Date;
+ var remaining = wait - (now - previous);
+ context = this;
+ args = arguments;
+ if (remaining <= 0) {
+ clearTimeout(timeout);
+ timeout = null;
+ previous = now;
+ result = func.apply(context, args);
+ } else if (!timeout) {
+ timeout = setTimeout(later, remaining);
+ }
+ return result;
+ };
+ };
+
+ // Returns a function, that, as long as it continues to be invoked, will not
+ // be triggered. The function will be called after it stops being called for
+ // N milliseconds. If `immediate` is passed, trigger the function on the
+ // leading edge, instead of the trailing.
+ _.debounce = function(func, wait, immediate) {
+ var timeout, result;
+ return function() {
+ var context = this, args = arguments;
+ var later = function() {
+ timeout = null;
+ if (!immediate) result = func.apply(context, args);
+ };
+ var callNow = immediate && !timeout;
+ clearTimeout(timeout);
+ timeout = setTimeout(later, wait);
+ if (callNow) result = func.apply(context, args);
+ return result;
+ };
+ };
+
+ // Returns a function that will be executed at most one time, no matter how
+ // often you call it. Useful for lazy initialization.
+ _.once = function(func) {
+ var ran = false, memo;
+ return function() {
+ if (ran) return memo;
+ ran = true;
+ memo = func.apply(this, arguments);
+ func = null;
+ return memo;
+ };
+ };
+
+ // Returns the first function passed as an argument to the second,
+ // allowing you to adjust arguments, run code before and after, and
+ // conditionally execute the original function.
+ _.wrap = function(func, wrapper) {
+ return function() {
+ var args = [func];
+ push.apply(args, arguments);
+ return wrapper.apply(this, args);
+ };
+ };
+
+ // Returns a function that is the composition of a list of functions, each
+ // consuming the return value of the function that follows.
+ _.compose = function() {
+ var funcs = arguments;
+ return function() {
+ var args = arguments;
+ for (var i = funcs.length - 1; i >= 0; i--) {
+ args = [funcs[i].apply(this, args)];
+ }
+ return args[0];
+ };
+ };
+
+ // Returns a function that will only be executed after being called N times.
+ _.after = function(times, func) {
+ if (times <= 0) return func();
+ return function() {
+ if (--times < 1) {
+ return func.apply(this, arguments);
+ }
+ };
+ };
+
+ // Object Functions
+ // ----------------
+
+ // Retrieve the names of an object's properties.
+ // Delegates to **ECMAScript 5**'s native `Object.keys`
+ _.keys = nativeKeys || function(obj) {
+ if (obj !== Object(obj)) throw new TypeError('Invalid object');
+ var keys = [];
+ for (var key in obj) if (_.has(obj, key)) keys[keys.length] = key;
+ return keys;
+ };
+
+ // Retrieve the values of an object's properties.
+ _.values = function(obj) {
+ var values = [];
+ for (var key in obj) if (_.has(obj, key)) values.push(obj[key]);
+ return values;
+ };
+
+ // Convert an object into a list of `[key, value]` pairs.
+ _.pairs = function(obj) {
+ var pairs = [];
+ for (var key in obj) if (_.has(obj, key)) pairs.push([key, obj[key]]);
+ return pairs;
+ };
+
+ // Invert the keys and values of an object. The values must be serializable.
+ _.invert = function(obj) {
+ var result = {};
+ for (var key in obj) if (_.has(obj, key)) result[obj[key]] = key;
+ return result;
+ };
+
+ // Return a sorted list of the function names available on the object.
+ // Aliased as `methods`
+ _.functions = _.methods = function(obj) {
+ var names = [];
+ for (var key in obj) {
+ if (_.isFunction(obj[key])) names.push(key);
+ }
+ return names.sort();
+ };
+
+ // Extend a given object with all the properties in passed-in object(s).
+ _.extend = function(obj) {
+ each(slice.call(arguments, 1), function(source) {
+ if (source) {
+ for (var prop in source) {
+ obj[prop] = source[prop];
+ }
+ }
+ });
+ return obj;
+ };
+
+ // Return a copy of the object only containing the whitelisted properties.
+ _.pick = function(obj) {
+ var copy = {};
+ var keys = concat.apply(ArrayProto, slice.call(arguments, 1));
+ each(keys, function(key) {
+ if (key in obj) copy[key] = obj[key];
+ });
+ return copy;
+ };
+
+ // Return a copy of the object without the blacklisted properties.
+ _.omit = function(obj) {
+ var copy = {};
+ var keys = concat.apply(ArrayProto, slice.call(arguments, 1));
+ for (var key in obj) {
+ if (!_.contains(keys, key)) copy[key] = obj[key];
+ }
+ return copy;
+ };
+
+ // Fill in a given object with default properties.
+ _.defaults = function(obj) {
+ each(slice.call(arguments, 1), function(source) {
+ if (source) {
+ for (var prop in source) {
+ if (obj[prop] == null) obj[prop] = source[prop];
+ }
+ }
+ });
+ return obj;
+ };
+
+ // Create a (shallow-cloned) duplicate of an object.
+ _.clone = function(obj) {
+ if (!_.isObject(obj)) return obj;
+ return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
+ };
+
+ // Invokes interceptor with the obj, and then returns obj.
+ // The primary purpose of this method is to "tap into" a method chain, in
+ // order to perform operations on intermediate results within the chain.
+ _.tap = function(obj, interceptor) {
+ interceptor(obj);
+ return obj;
+ };
+
+ // Internal recursive comparison function for `isEqual`.
+ var eq = function(a, b, aStack, bStack) {
+ // Identical objects are equal. `0 === -0`, but they aren't identical.
+ // See the Harmony `egal` proposal: http://wiki.ecmascript.org/doku.php?id=harmony:egal.
+ if (a === b) return a !== 0 || 1 / a == 1 / b;
+ // A strict comparison is necessary because `null == undefined`.
+ if (a == null || b == null) return a === b;
+ // Unwrap any wrapped objects.
+ if (a instanceof _) a = a._wrapped;
+ if (b instanceof _) b = b._wrapped;
+ // Compare `[[Class]]` names.
+ var className = toString.call(a);
+ if (className != toString.call(b)) return false;
+ switch (className) {
+ // Strings, numbers, dates, and booleans are compared by value.
+ case '[object String]':
+ // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
+ // equivalent to `new String("5")`.
+ return a == String(b);
+ case '[object Number]':
+ // `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
+ // other numeric values.
+ return a != +a ? b != +b : (a == 0 ? 1 / a == 1 / b : a == +b);
+ case '[object Date]':
+ case '[object Boolean]':
+ // Coerce dates and booleans to numeric primitive values. Dates are compared by their
+ // millisecond representations. Note that invalid dates with millisecond representations
+ // of `NaN` are not equivalent.
+ return +a == +b;
+ // RegExps are compared by their source patterns and flags.
+ case '[object RegExp]':
+ return a.source == b.source &&
+ a.global == b.global &&
+ a.multiline == b.multiline &&
+ a.ignoreCase == b.ignoreCase;
+ }
+ if (typeof a != 'object' || typeof b != 'object') return false;
+ // Assume equality for cyclic structures. The algorithm for detecting cyclic
+ // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
+ var length = aStack.length;
+ while (length--) {
+ // Linear search. Performance is inversely proportional to the number of
+ // unique nested structures.
+ if (aStack[length] == a) return bStack[length] == b;
+ }
+ // Add the first object to the stack of traversed objects.
+ aStack.push(a);
+ bStack.push(b);
+ var size = 0, result = true;
+ // Recursively compare objects and arrays.
+ if (className == '[object Array]') {
+ // Compare array lengths to determine if a deep comparison is necessary.
+ size = a.length;
+ result = size == b.length;
+ if (result) {
+ // Deep compare the contents, ignoring non-numeric properties.
+ while (size--) {
+ if (!(result = eq(a[size], b[size], aStack, bStack))) break;
+ }
+ }
+ } else {
+ // Objects with different constructors are not equivalent, but `Object`s
+ // from different frames are.
+ var aCtor = a.constructor, bCtor = b.constructor;
+ if (aCtor !== bCtor && !(_.isFunction(aCtor) && (aCtor instanceof aCtor) &&
+ _.isFunction(bCtor) && (bCtor instanceof bCtor))) {
+ return false;
+ }
+ // Deep compare objects.
+ for (var key in a) {
+ if (_.has(a, key)) {
+ // Count the expected number of properties.
+ size++;
+ // Deep compare each member.
+ if (!(result = _.has(b, key) && eq(a[key], b[key], aStack, bStack))) break;
+ }
+ }
+ // Ensure that both objects contain the same number of properties.
+ if (result) {
+ for (key in b) {
+ if (_.has(b, key) && !(size--)) break;
+ }
+ result = !size;
+ }
+ }
+ // Remove the first object from the stack of traversed objects.
+ aStack.pop();
+ bStack.pop();
+ return result;
+ };
+
+ // Perform a deep comparison to check if two objects are equal.
+ _.isEqual = function(a, b) {
+ return eq(a, b, [], []);
+ };
+
+ // Is a given array, string, or object empty?
+ // An "empty" object has no enumerable own-properties.
+ _.isEmpty = function(obj) {
+ if (obj == null) return true;
+ if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
+ for (var key in obj) if (_.has(obj, key)) return false;
+ return true;
+ };
+
+ // Is a given value a DOM element?
+ _.isElement = function(obj) {
+ return !!(obj && obj.nodeType === 1);
+ };
+
+ // Is a given value an array?
+ // Delegates to ECMA5's native Array.isArray
+ _.isArray = nativeIsArray || function(obj) {
+ return toString.call(obj) == '[object Array]';
+ };
+
+ // Is a given variable an object?
+ _.isObject = function(obj) {
+ return obj === Object(obj);
+ };
+
+ // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp.
+ each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp'], function(name) {
+ _['is' + name] = function(obj) {
+ return toString.call(obj) == '[object ' + name + ']';
+ };
+ });
+
+ // Define a fallback version of the method in browsers (ahem, IE), where
+ // there isn't any inspectable "Arguments" type.
+ if (!_.isArguments(arguments)) {
+ _.isArguments = function(obj) {
+ return !!(obj && _.has(obj, 'callee'));
+ };
+ }
+
+ // Optimize `isFunction` if appropriate.
+ if (typeof (/./) !== 'function') {
+ _.isFunction = function(obj) {
+ return typeof obj === 'function';
+ };
+ }
+
+ // Is a given object a finite number?
+ _.isFinite = function(obj) {
+ return isFinite(obj) && !isNaN(parseFloat(obj));
+ };
+
+ // Is the given value `NaN`? (NaN is the only number which does not equal itself).
+ _.isNaN = function(obj) {
+ return _.isNumber(obj) && obj != +obj;
+ };
+
+ // Is a given value a boolean?
+ _.isBoolean = function(obj) {
+ return obj === true || obj === false || toString.call(obj) == '[object Boolean]';
+ };
+
+ // Is a given value equal to null?
+ _.isNull = function(obj) {
+ return obj === null;
+ };
+
+ // Is a given variable undefined?
+ _.isUndefined = function(obj) {
+ return obj === void 0;
+ };
+
+ // Shortcut function for checking if an object has a given property directly
+ // on itself (in other words, not on a prototype).
+ _.has = function(obj, key) {
+ return hasOwnProperty.call(obj, key);
+ };
+
+ // Utility Functions
+ // -----------------
+
+ // Run Underscore.js in *noConflict* mode, returning the `_` variable to its
+ // previous owner. Returns a reference to the Underscore object.
+ _.noConflict = function() {
+ root._ = previousUnderscore;
+ return this;
+ };
+
+ // Keep the identity function around for default iterators.
+ _.identity = function(value) {
+ return value;
+ };
+
+ // Run a function **n** times.
+ _.times = function(n, iterator, context) {
+ var accum = Array(n);
+ for (var i = 0; i < n; i++) accum[i] = iterator.call(context, i);
+ return accum;
+ };
+
+ // Return a random integer between min and max (inclusive).
+ _.random = function(min, max) {
+ if (max == null) {
+ max = min;
+ min = 0;
+ }
+ return min + Math.floor(Math.random() * (max - min + 1));
+ };
+
+ // List of HTML entities for escaping.
+ var entityMap = {
+ escape: {
+ '&': '&',
+ '<': '<',
+ '>': '>',
+ '"': '"',
+ "'": ''',
+ '/': '/'
+ }
+ };
+ entityMap.unescape = _.invert(entityMap.escape);
+
+ // Regexes containing the keys and values listed immediately above.
+ var entityRegexes = {
+ escape: new RegExp('[' + _.keys(entityMap.escape).join('') + ']', 'g'),
+ unescape: new RegExp('(' + _.keys(entityMap.unescape).join('|') + ')', 'g')
+ };
+
+ // Functions for escaping and unescaping strings to/from HTML interpolation.
+ _.each(['escape', 'unescape'], function(method) {
+ _[method] = function(string) {
+ if (string == null) return '';
+ return ('' + string).replace(entityRegexes[method], function(match) {
+ return entityMap[method][match];
+ });
+ };
+ });
+
+ // If the value of the named property is a function then invoke it;
+ // otherwise, return it.
+ _.result = function(object, property) {
+ if (object == null) return null;
+ var value = object[property];
+ return _.isFunction(value) ? value.call(object) : value;
+ };
+
+ // Add your own custom functions to the Underscore object.
+ _.mixin = function(obj) {
+ each(_.functions(obj), function(name){
+ var func = _[name] = obj[name];
+ _.prototype[name] = function() {
+ var args = [this._wrapped];
+ push.apply(args, arguments);
+ return result.call(this, func.apply(_, args));
+ };
+ });
+ };
+
+ // Generate a unique integer id (unique within the entire client session).
+ // Useful for temporary DOM ids.
+ var idCounter = 0;
+ _.uniqueId = function(prefix) {
+ var id = ++idCounter + '';
+ return prefix ? prefix + id : id;
+ };
+
+ // By default, Underscore uses ERB-style template delimiters, change the
+ // following template settings to use alternative delimiters.
+ _.templateSettings = {
+ evaluate : /<%([\s\S]+?)%>/g,
+ interpolate : /<%=([\s\S]+?)%>/g,
+ escape : /<%-([\s\S]+?)%>/g
+ };
+
+ // When customizing `templateSettings`, if you don't want to define an
+ // interpolation, evaluation or escaping regex, we need one that is
+ // guaranteed not to match.
+ var noMatch = /(.)^/;
+
+ // Certain characters need to be escaped so that they can be put into a
+ // string literal.
+ var escapes = {
+ "'": "'",
+ '\\': '\\',
+ '\r': 'r',
+ '\n': 'n',
+ '\t': 't',
+ '\u2028': 'u2028',
+ '\u2029': 'u2029'
+ };
+
+ var escaper = /\\|'|\r|\n|\t|\u2028|\u2029/g;
+
+ // JavaScript micro-templating, similar to John Resig's implementation.
+ // Underscore templating handles arbitrary delimiters, preserves whitespace,
+ // and correctly escapes quotes within interpolated code.
+ _.template = function(text, data, settings) {
+ var render;
+ settings = _.defaults({}, settings, _.templateSettings);
+
+ // Combine delimiters into one regular expression via alternation.
+ var matcher = new RegExp([
+ (settings.escape || noMatch).source,
+ (settings.interpolate || noMatch).source,
+ (settings.evaluate || noMatch).source
+ ].join('|') + '|$', 'g');
+
+ // Compile the template source, escaping string literals appropriately.
+ var index = 0;
+ var source = "__p+='";
+ text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
+ source += text.slice(index, offset)
+ .replace(escaper, function(match) { return '\\' + escapes[match]; });
+
+ if (escape) {
+ source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
+ }
+ if (interpolate) {
+ source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
+ }
+ if (evaluate) {
+ source += "';\n" + evaluate + "\n__p+='";
+ }
+ index = offset + match.length;
+ return match;
+ });
+ source += "';\n";
+
+ // If a variable is not specified, place data values in local scope.
+ if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';
+
+ source = "var __t,__p='',__j=Array.prototype.join," +
+ "print=function(){__p+=__j.call(arguments,'');};\n" +
+ source + "return __p;\n";
+
+ try {
+ render = new Function(settings.variable || 'obj', '_', source);
+ } catch (e) {
+ e.source = source;
+ throw e;
+ }
+
+ if (data) return render(data, _);
+ var template = function(data) {
+ return render.call(this, data, _);
+ };
+
+ // Provide the compiled function source as a convenience for precompilation.
+ template.source = 'function(' + (settings.variable || 'obj') + '){\n' + source + '}';
+
+ return template;
+ };
+
+ // Add a "chain" function, which will delegate to the wrapper.
+ _.chain = function(obj) {
+ return _(obj).chain();
+ };
+
+ // OOP
+ // ---------------
+ // If Underscore is called as a function, it returns a wrapped object that
+ // can be used OO-style. This wrapper holds altered versions of all the
+ // underscore functions. Wrapped objects may be chained.
+
+ // Helper function to continue chaining intermediate results.
+ var result = function(obj) {
+ return this._chain ? _(obj).chain() : obj;
+ };
+
+ // Add all of the Underscore functions to the wrapper object.
+ _.mixin(_);
+
+ // Add all mutator Array functions to the wrapper.
+ each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
+ var method = ArrayProto[name];
+ _.prototype[name] = function() {
+ var obj = this._wrapped;
+ method.apply(obj, arguments);
+ if ((name == 'shift' || name == 'splice') && obj.length === 0) delete obj[0];
+ return result.call(this, obj);
+ };
+ });
+
+ // Add all accessor Array functions to the wrapper.
+ each(['concat', 'join', 'slice'], function(name) {
+ var method = ArrayProto[name];
+ _.prototype[name] = function() {
+ return result.call(this, method.apply(this._wrapped, arguments));
+ };
+ });
+
+ _.extend(_.prototype, {
+
+ // Start chaining a wrapped Underscore object.
+ chain: function() {
+ this._chain = true;
+ return this;
+ },
+
+ // Extracts the result from a wrapped and chained object.
+ value: function() {
+ return this._wrapped;
+ }
+
+ });
+
+}).call(this);
Added: www-releases/trunk/3.8.0/projects/libcxx/docs/_static/up-pressed.png
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URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/up.png?rev=262945&view=auto
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Added: www-releases/trunk/3.8.0/projects/libcxx/docs/_static/websupport.js
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/_static/websupport.js?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/projects/libcxx/docs/_static/websupport.js (added)
+++ www-releases/trunk/3.8.0/projects/libcxx/docs/_static/websupport.js Tue Mar 8 12:28:17 2016
@@ -0,0 +1,808 @@
+/*
+ * websupport.js
+ * ~~~~~~~~~~~~~
+ *
+ * sphinx.websupport utilties for all documentation.
+ *
+ * :copyright: Copyright 2007-2014 by the Sphinx team, see AUTHORS.
+ * :license: BSD, see LICENSE for details.
+ *
+ */
+
+(function($) {
+ $.fn.autogrow = function() {
+ return this.each(function() {
+ var textarea = this;
+
+ $.fn.autogrow.resize(textarea);
+
+ $(textarea)
+ .focus(function() {
+ textarea.interval = setInterval(function() {
+ $.fn.autogrow.resize(textarea);
+ }, 500);
+ })
+ .blur(function() {
+ clearInterval(textarea.interval);
+ });
+ });
+ };
+
+ $.fn.autogrow.resize = function(textarea) {
+ var lineHeight = parseInt($(textarea).css('line-height'), 10);
+ var lines = textarea.value.split('\n');
+ var columns = textarea.cols;
+ var lineCount = 0;
+ $.each(lines, function() {
+ lineCount += Math.ceil(this.length / columns) || 1;
+ });
+ var height = lineHeight * (lineCount + 1);
+ $(textarea).css('height', height);
+ };
+})(jQuery);
+
+(function($) {
+ var comp, by;
+
+ function init() {
+ initEvents();
+ initComparator();
+ }
+
+ function initEvents() {
+ $('a.comment-close').live("click", function(event) {
+ event.preventDefault();
+ hide($(this).attr('id').substring(2));
+ });
+ $('a.vote').live("click", function(event) {
+ event.preventDefault();
+ handleVote($(this));
+ });
+ $('a.reply').live("click", function(event) {
+ event.preventDefault();
+ openReply($(this).attr('id').substring(2));
+ });
+ $('a.close-reply').live("click", function(event) {
+ event.preventDefault();
+ closeReply($(this).attr('id').substring(2));
+ });
+ $('a.sort-option').live("click", function(event) {
+ event.preventDefault();
+ handleReSort($(this));
+ });
+ $('a.show-proposal').live("click", function(event) {
+ event.preventDefault();
+ showProposal($(this).attr('id').substring(2));
+ });
+ $('a.hide-proposal').live("click", function(event) {
+ event.preventDefault();
+ hideProposal($(this).attr('id').substring(2));
+ });
+ $('a.show-propose-change').live("click", function(event) {
+ event.preventDefault();
+ showProposeChange($(this).attr('id').substring(2));
+ });
+ $('a.hide-propose-change').live("click", function(event) {
+ event.preventDefault();
+ hideProposeChange($(this).attr('id').substring(2));
+ });
+ $('a.accept-comment').live("click", function(event) {
+ event.preventDefault();
+ acceptComment($(this).attr('id').substring(2));
+ });
+ $('a.delete-comment').live("click", function(event) {
+ event.preventDefault();
+ deleteComment($(this).attr('id').substring(2));
+ });
+ $('a.comment-markup').live("click", function(event) {
+ event.preventDefault();
+ toggleCommentMarkupBox($(this).attr('id').substring(2));
+ });
+ }
+
+ /**
+ * Set comp, which is a comparator function used for sorting and
+ * inserting comments into the list.
+ */
+ function setComparator() {
+ // If the first three letters are "asc", sort in ascending order
+ // and remove the prefix.
+ if (by.substring(0,3) == 'asc') {
+ var i = by.substring(3);
+ comp = function(a, b) { return a[i] - b[i]; };
+ } else {
+ // Otherwise sort in descending order.
+ comp = function(a, b) { return b[by] - a[by]; };
+ }
+
+ // Reset link styles and format the selected sort option.
+ $('a.sel').attr('href', '#').removeClass('sel');
+ $('a.by' + by).removeAttr('href').addClass('sel');
+ }
+
+ /**
+ * Create a comp function. If the user has preferences stored in
+ * the sortBy cookie, use those, otherwise use the default.
+ */
+ function initComparator() {
+ by = 'rating'; // Default to sort by rating.
+ // If the sortBy cookie is set, use that instead.
+ if (document.cookie.length > 0) {
+ var start = document.cookie.indexOf('sortBy=');
+ if (start != -1) {
+ start = start + 7;
+ var end = document.cookie.indexOf(";", start);
+ if (end == -1) {
+ end = document.cookie.length;
+ by = unescape(document.cookie.substring(start, end));
+ }
+ }
+ }
+ setComparator();
+ }
+
+ /**
+ * Show a comment div.
+ */
+ function show(id) {
+ $('#ao' + id).hide();
+ $('#ah' + id).show();
+ var context = $.extend({id: id}, opts);
+ var popup = $(renderTemplate(popupTemplate, context)).hide();
+ popup.find('textarea[name="proposal"]').hide();
+ popup.find('a.by' + by).addClass('sel');
+ var form = popup.find('#cf' + id);
+ form.submit(function(event) {
+ event.preventDefault();
+ addComment(form);
+ });
+ $('#s' + id).after(popup);
+ popup.slideDown('fast', function() {
+ getComments(id);
+ });
+ }
+
+ /**
+ * Hide a comment div.
+ */
+ function hide(id) {
+ $('#ah' + id).hide();
+ $('#ao' + id).show();
+ var div = $('#sc' + id);
+ div.slideUp('fast', function() {
+ div.remove();
+ });
+ }
+
+ /**
+ * Perform an ajax request to get comments for a node
+ * and insert the comments into the comments tree.
+ */
+ function getComments(id) {
+ $.ajax({
+ type: 'GET',
+ url: opts.getCommentsURL,
+ data: {node: id},
+ success: function(data, textStatus, request) {
+ var ul = $('#cl' + id);
+ var speed = 100;
+ $('#cf' + id)
+ .find('textarea[name="proposal"]')
+ .data('source', data.source);
+
+ if (data.comments.length === 0) {
+ ul.html('<li>No comments yet.</li>');
+ ul.data('empty', true);
+ } else {
+ // If there are comments, sort them and put them in the list.
+ var comments = sortComments(data.comments);
+ speed = data.comments.length * 100;
+ appendComments(comments, ul);
+ ul.data('empty', false);
+ }
+ $('#cn' + id).slideUp(speed + 200);
+ ul.slideDown(speed);
+ },
+ error: function(request, textStatus, error) {
+ showError('Oops, there was a problem retrieving the comments.');
+ },
+ dataType: 'json'
+ });
+ }
+
+ /**
+ * Add a comment via ajax and insert the comment into the comment tree.
+ */
+ function addComment(form) {
+ var node_id = form.find('input[name="node"]').val();
+ var parent_id = form.find('input[name="parent"]').val();
+ var text = form.find('textarea[name="comment"]').val();
+ var proposal = form.find('textarea[name="proposal"]').val();
+
+ if (text == '') {
+ showError('Please enter a comment.');
+ return;
+ }
+
+ // Disable the form that is being submitted.
+ form.find('textarea,input').attr('disabled', 'disabled');
+
+ // Send the comment to the server.
+ $.ajax({
+ type: "POST",
+ url: opts.addCommentURL,
+ dataType: 'json',
+ data: {
+ node: node_id,
+ parent: parent_id,
+ text: text,
+ proposal: proposal
+ },
+ success: function(data, textStatus, error) {
+ // Reset the form.
+ if (node_id) {
+ hideProposeChange(node_id);
+ }
+ form.find('textarea')
+ .val('')
+ .add(form.find('input'))
+ .removeAttr('disabled');
+ var ul = $('#cl' + (node_id || parent_id));
+ if (ul.data('empty')) {
+ $(ul).empty();
+ ul.data('empty', false);
+ }
+ insertComment(data.comment);
+ var ao = $('#ao' + node_id);
+ ao.find('img').attr({'src': opts.commentBrightImage});
+ if (node_id) {
+ // if this was a "root" comment, remove the commenting box
+ // (the user can get it back by reopening the comment popup)
+ $('#ca' + node_id).slideUp();
+ }
+ },
+ error: function(request, textStatus, error) {
+ form.find('textarea,input').removeAttr('disabled');
+ showError('Oops, there was a problem adding the comment.');
+ }
+ });
+ }
+
+ /**
+ * Recursively append comments to the main comment list and children
+ * lists, creating the comment tree.
+ */
+ function appendComments(comments, ul) {
+ $.each(comments, function() {
+ var div = createCommentDiv(this);
+ ul.append($(document.createElement('li')).html(div));
+ appendComments(this.children, div.find('ul.comment-children'));
+ // To avoid stagnating data, don't store the comments children in data.
+ this.children = null;
+ div.data('comment', this);
+ });
+ }
+
+ /**
+ * After adding a new comment, it must be inserted in the correct
+ * location in the comment tree.
+ */
+ function insertComment(comment) {
+ var div = createCommentDiv(comment);
+
+ // To avoid stagnating data, don't store the comments children in data.
+ comment.children = null;
+ div.data('comment', comment);
+
+ var ul = $('#cl' + (comment.node || comment.parent));
+ var siblings = getChildren(ul);
+
+ var li = $(document.createElement('li'));
+ li.hide();
+
+ // Determine where in the parents children list to insert this comment.
+ for(i=0; i < siblings.length; i++) {
+ if (comp(comment, siblings[i]) <= 0) {
+ $('#cd' + siblings[i].id)
+ .parent()
+ .before(li.html(div));
+ li.slideDown('fast');
+ return;
+ }
+ }
+
+ // If we get here, this comment rates lower than all the others,
+ // or it is the only comment in the list.
+ ul.append(li.html(div));
+ li.slideDown('fast');
+ }
+
+ function acceptComment(id) {
+ $.ajax({
+ type: 'POST',
+ url: opts.acceptCommentURL,
+ data: {id: id},
+ success: function(data, textStatus, request) {
+ $('#cm' + id).fadeOut('fast');
+ $('#cd' + id).removeClass('moderate');
+ },
+ error: function(request, textStatus, error) {
+ showError('Oops, there was a problem accepting the comment.');
+ }
+ });
+ }
+
+ function deleteComment(id) {
+ $.ajax({
+ type: 'POST',
+ url: opts.deleteCommentURL,
+ data: {id: id},
+ success: function(data, textStatus, request) {
+ var div = $('#cd' + id);
+ if (data == 'delete') {
+ // Moderator mode: remove the comment and all children immediately
+ div.slideUp('fast', function() {
+ div.remove();
+ });
+ return;
+ }
+ // User mode: only mark the comment as deleted
+ div
+ .find('span.user-id:first')
+ .text('[deleted]').end()
+ .find('div.comment-text:first')
+ .text('[deleted]').end()
+ .find('#cm' + id + ', #dc' + id + ', #ac' + id + ', #rc' + id +
+ ', #sp' + id + ', #hp' + id + ', #cr' + id + ', #rl' + id)
+ .remove();
+ var comment = div.data('comment');
+ comment.username = '[deleted]';
+ comment.text = '[deleted]';
+ div.data('comment', comment);
+ },
+ error: function(request, textStatus, error) {
+ showError('Oops, there was a problem deleting the comment.');
+ }
+ });
+ }
+
+ function showProposal(id) {
+ $('#sp' + id).hide();
+ $('#hp' + id).show();
+ $('#pr' + id).slideDown('fast');
+ }
+
+ function hideProposal(id) {
+ $('#hp' + id).hide();
+ $('#sp' + id).show();
+ $('#pr' + id).slideUp('fast');
+ }
+
+ function showProposeChange(id) {
+ $('#pc' + id).hide();
+ $('#hc' + id).show();
+ var textarea = $('#pt' + id);
+ textarea.val(textarea.data('source'));
+ $.fn.autogrow.resize(textarea[0]);
+ textarea.slideDown('fast');
+ }
+
+ function hideProposeChange(id) {
+ $('#hc' + id).hide();
+ $('#pc' + id).show();
+ var textarea = $('#pt' + id);
+ textarea.val('').removeAttr('disabled');
+ textarea.slideUp('fast');
+ }
+
+ function toggleCommentMarkupBox(id) {
+ $('#mb' + id).toggle();
+ }
+
+ /** Handle when the user clicks on a sort by link. */
+ function handleReSort(link) {
+ var classes = link.attr('class').split(/\s+/);
+ for (var i=0; i<classes.length; i++) {
+ if (classes[i] != 'sort-option') {
+ by = classes[i].substring(2);
+ }
+ }
+ setComparator();
+ // Save/update the sortBy cookie.
+ var expiration = new Date();
+ expiration.setDate(expiration.getDate() + 365);
+ document.cookie= 'sortBy=' + escape(by) +
+ ';expires=' + expiration.toUTCString();
+ $('ul.comment-ul').each(function(index, ul) {
+ var comments = getChildren($(ul), true);
+ comments = sortComments(comments);
+ appendComments(comments, $(ul).empty());
+ });
+ }
+
+ /**
+ * Function to process a vote when a user clicks an arrow.
+ */
+ function handleVote(link) {
+ if (!opts.voting) {
+ showError("You'll need to login to vote.");
+ return;
+ }
+
+ var id = link.attr('id');
+ if (!id) {
+ // Didn't click on one of the voting arrows.
+ return;
+ }
+ // If it is an unvote, the new vote value is 0,
+ // Otherwise it's 1 for an upvote, or -1 for a downvote.
+ var value = 0;
+ if (id.charAt(1) != 'u') {
+ value = id.charAt(0) == 'u' ? 1 : -1;
+ }
+ // The data to be sent to the server.
+ var d = {
+ comment_id: id.substring(2),
+ value: value
+ };
+
+ // Swap the vote and unvote links.
+ link.hide();
+ $('#' + id.charAt(0) + (id.charAt(1) == 'u' ? 'v' : 'u') + d.comment_id)
+ .show();
+
+ // The div the comment is displayed in.
+ var div = $('div#cd' + d.comment_id);
+ var data = div.data('comment');
+
+ // If this is not an unvote, and the other vote arrow has
+ // already been pressed, unpress it.
+ if ((d.value !== 0) && (data.vote === d.value * -1)) {
+ $('#' + (d.value == 1 ? 'd' : 'u') + 'u' + d.comment_id).hide();
+ $('#' + (d.value == 1 ? 'd' : 'u') + 'v' + d.comment_id).show();
+ }
+
+ // Update the comments rating in the local data.
+ data.rating += (data.vote === 0) ? d.value : (d.value - data.vote);
+ data.vote = d.value;
+ div.data('comment', data);
+
+ // Change the rating text.
+ div.find('.rating:first')
+ .text(data.rating + ' point' + (data.rating == 1 ? '' : 's'));
+
+ // Send the vote information to the server.
+ $.ajax({
+ type: "POST",
+ url: opts.processVoteURL,
+ data: d,
+ error: function(request, textStatus, error) {
+ showError('Oops, there was a problem casting that vote.');
+ }
+ });
+ }
+
+ /**
+ * Open a reply form used to reply to an existing comment.
+ */
+ function openReply(id) {
+ // Swap out the reply link for the hide link
+ $('#rl' + id).hide();
+ $('#cr' + id).show();
+
+ // Add the reply li to the children ul.
+ var div = $(renderTemplate(replyTemplate, {id: id})).hide();
+ $('#cl' + id)
+ .prepend(div)
+ // Setup the submit handler for the reply form.
+ .find('#rf' + id)
+ .submit(function(event) {
+ event.preventDefault();
+ addComment($('#rf' + id));
+ closeReply(id);
+ })
+ .find('input[type=button]')
+ .click(function() {
+ closeReply(id);
+ });
+ div.slideDown('fast', function() {
+ $('#rf' + id).find('textarea').focus();
+ });
+ }
+
+ /**
+ * Close the reply form opened with openReply.
+ */
+ function closeReply(id) {
+ // Remove the reply div from the DOM.
+ $('#rd' + id).slideUp('fast', function() {
+ $(this).remove();
+ });
+
+ // Swap out the hide link for the reply link
+ $('#cr' + id).hide();
+ $('#rl' + id).show();
+ }
+
+ /**
+ * Recursively sort a tree of comments using the comp comparator.
+ */
+ function sortComments(comments) {
+ comments.sort(comp);
+ $.each(comments, function() {
+ this.children = sortComments(this.children);
+ });
+ return comments;
+ }
+
+ /**
+ * Get the children comments from a ul. If recursive is true,
+ * recursively include childrens' children.
+ */
+ function getChildren(ul, recursive) {
+ var children = [];
+ ul.children().children("[id^='cd']")
+ .each(function() {
+ var comment = $(this).data('comment');
+ if (recursive)
+ comment.children = getChildren($(this).find('#cl' + comment.id), true);
+ children.push(comment);
+ });
+ return children;
+ }
+
+ /** Create a div to display a comment in. */
+ function createCommentDiv(comment) {
+ if (!comment.displayed && !opts.moderator) {
+ return $('<div class="moderate">Thank you! Your comment will show up '
+ + 'once it is has been approved by a moderator.</div>');
+ }
+ // Prettify the comment rating.
+ comment.pretty_rating = comment.rating + ' point' +
+ (comment.rating == 1 ? '' : 's');
+ // Make a class (for displaying not yet moderated comments differently)
+ comment.css_class = comment.displayed ? '' : ' moderate';
+ // Create a div for this comment.
+ var context = $.extend({}, opts, comment);
+ var div = $(renderTemplate(commentTemplate, context));
+
+ // If the user has voted on this comment, highlight the correct arrow.
+ if (comment.vote) {
+ var direction = (comment.vote == 1) ? 'u' : 'd';
+ div.find('#' + direction + 'v' + comment.id).hide();
+ div.find('#' + direction + 'u' + comment.id).show();
+ }
+
+ if (opts.moderator || comment.text != '[deleted]') {
+ div.find('a.reply').show();
+ if (comment.proposal_diff)
+ div.find('#sp' + comment.id).show();
+ if (opts.moderator && !comment.displayed)
+ div.find('#cm' + comment.id).show();
+ if (opts.moderator || (opts.username == comment.username))
+ div.find('#dc' + comment.id).show();
+ }
+ return div;
+ }
+
+ /**
+ * A simple template renderer. Placeholders such as <%id%> are replaced
+ * by context['id'] with items being escaped. Placeholders such as <#id#>
+ * are not escaped.
+ */
+ function renderTemplate(template, context) {
+ var esc = $(document.createElement('div'));
+
+ function handle(ph, escape) {
+ var cur = context;
+ $.each(ph.split('.'), function() {
+ cur = cur[this];
+ });
+ return escape ? esc.text(cur || "").html() : cur;
+ }
+
+ return template.replace(/<([%#])([\w\.]*)\1>/g, function() {
+ return handle(arguments[2], arguments[1] == '%' ? true : false);
+ });
+ }
+
+ /** Flash an error message briefly. */
+ function showError(message) {
+ $(document.createElement('div')).attr({'class': 'popup-error'})
+ .append($(document.createElement('div'))
+ .attr({'class': 'error-message'}).text(message))
+ .appendTo('body')
+ .fadeIn("slow")
+ .delay(2000)
+ .fadeOut("slow");
+ }
+
+ /** Add a link the user uses to open the comments popup. */
+ $.fn.comment = function() {
+ return this.each(function() {
+ var id = $(this).attr('id').substring(1);
+ var count = COMMENT_METADATA[id];
+ var title = count + ' comment' + (count == 1 ? '' : 's');
+ var image = count > 0 ? opts.commentBrightImage : opts.commentImage;
+ var addcls = count == 0 ? ' nocomment' : '';
+ $(this)
+ .append(
+ $(document.createElement('a')).attr({
+ href: '#',
+ 'class': 'sphinx-comment-open' + addcls,
+ id: 'ao' + id
+ })
+ .append($(document.createElement('img')).attr({
+ src: image,
+ alt: 'comment',
+ title: title
+ }))
+ .click(function(event) {
+ event.preventDefault();
+ show($(this).attr('id').substring(2));
+ })
+ )
+ .append(
+ $(document.createElement('a')).attr({
+ href: '#',
+ 'class': 'sphinx-comment-close hidden',
+ id: 'ah' + id
+ })
+ .append($(document.createElement('img')).attr({
+ src: opts.closeCommentImage,
+ alt: 'close',
+ title: 'close'
+ }))
+ .click(function(event) {
+ event.preventDefault();
+ hide($(this).attr('id').substring(2));
+ })
+ );
+ });
+ };
+
+ var opts = {
+ processVoteURL: '/_process_vote',
+ addCommentURL: '/_add_comment',
+ getCommentsURL: '/_get_comments',
+ acceptCommentURL: '/_accept_comment',
+ deleteCommentURL: '/_delete_comment',
+ commentImage: '/static/_static/comment.png',
+ closeCommentImage: '/static/_static/comment-close.png',
+ loadingImage: '/static/_static/ajax-loader.gif',
+ commentBrightImage: '/static/_static/comment-bright.png',
+ upArrow: '/static/_static/up.png',
+ downArrow: '/static/_static/down.png',
+ upArrowPressed: '/static/_static/up-pressed.png',
+ downArrowPressed: '/static/_static/down-pressed.png',
+ voting: false,
+ moderator: false
+ };
+
+ if (typeof COMMENT_OPTIONS != "undefined") {
+ opts = jQuery.extend(opts, COMMENT_OPTIONS);
+ }
+
+ var popupTemplate = '\
+ <div class="sphinx-comments" id="sc<%id%>">\
+ <p class="sort-options">\
+ Sort by:\
+ <a href="#" class="sort-option byrating">best rated</a>\
+ <a href="#" class="sort-option byascage">newest</a>\
+ <a href="#" class="sort-option byage">oldest</a>\
+ </p>\
+ <div class="comment-header">Comments</div>\
+ <div class="comment-loading" id="cn<%id%>">\
+ loading comments... <img src="<%loadingImage%>" alt="" /></div>\
+ <ul id="cl<%id%>" class="comment-ul"></ul>\
+ <div id="ca<%id%>">\
+ <p class="add-a-comment">Add a comment\
+ (<a href="#" class="comment-markup" id="ab<%id%>">markup</a>):</p>\
+ <div class="comment-markup-box" id="mb<%id%>">\
+ reStructured text markup: <i>*emph*</i>, <b>**strong**</b>, \
+ <tt>``code``</tt>, \
+ code blocks: <tt>::</tt> and an indented block after blank line</div>\
+ <form method="post" id="cf<%id%>" class="comment-form" action="">\
+ <textarea name="comment" cols="80"></textarea>\
+ <p class="propose-button">\
+ <a href="#" id="pc<%id%>" class="show-propose-change">\
+ Propose a change ▹\
+ </a>\
+ <a href="#" id="hc<%id%>" class="hide-propose-change">\
+ Propose a change ▿\
+ </a>\
+ </p>\
+ <textarea name="proposal" id="pt<%id%>" cols="80"\
+ spellcheck="false"></textarea>\
+ <input type="submit" value="Add comment" />\
+ <input type="hidden" name="node" value="<%id%>" />\
+ <input type="hidden" name="parent" value="" />\
+ </form>\
+ </div>\
+ </div>';
+
+ var commentTemplate = '\
+ <div id="cd<%id%>" class="sphinx-comment<%css_class%>">\
+ <div class="vote">\
+ <div class="arrow">\
+ <a href="#" id="uv<%id%>" class="vote" title="vote up">\
+ <img src="<%upArrow%>" />\
+ </a>\
+ <a href="#" id="uu<%id%>" class="un vote" title="vote up">\
+ <img src="<%upArrowPressed%>" />\
+ </a>\
+ </div>\
+ <div class="arrow">\
+ <a href="#" id="dv<%id%>" class="vote" title="vote down">\
+ <img src="<%downArrow%>" id="da<%id%>" />\
+ </a>\
+ <a href="#" id="du<%id%>" class="un vote" title="vote down">\
+ <img src="<%downArrowPressed%>" />\
+ </a>\
+ </div>\
+ </div>\
+ <div class="comment-content">\
+ <p class="tagline comment">\
+ <span class="user-id"><%username%></span>\
+ <span class="rating"><%pretty_rating%></span>\
+ <span class="delta"><%time.delta%></span>\
+ </p>\
+ <div class="comment-text comment"><#text#></div>\
+ <p class="comment-opts comment">\
+ <a href="#" class="reply hidden" id="rl<%id%>">reply ▹</a>\
+ <a href="#" class="close-reply" id="cr<%id%>">reply ▿</a>\
+ <a href="#" id="sp<%id%>" class="show-proposal">proposal ▹</a>\
+ <a href="#" id="hp<%id%>" class="hide-proposal">proposal ▿</a>\
+ <a href="#" id="dc<%id%>" class="delete-comment hidden">delete</a>\
+ <span id="cm<%id%>" class="moderation hidden">\
+ <a href="#" id="ac<%id%>" class="accept-comment">accept</a>\
+ </span>\
+ </p>\
+ <pre class="proposal" id="pr<%id%>">\
+<#proposal_diff#>\
+ </pre>\
+ <ul class="comment-children" id="cl<%id%>"></ul>\
+ </div>\
+ <div class="clearleft"></div>\
+ </div>\
+ </div>';
+
+ var replyTemplate = '\
+ <li>\
+ <div class="reply-div" id="rd<%id%>">\
+ <form id="rf<%id%>">\
+ <textarea name="comment" cols="80"></textarea>\
+ <input type="submit" value="Add reply" />\
+ <input type="button" value="Cancel" />\
+ <input type="hidden" name="parent" value="<%id%>" />\
+ <input type="hidden" name="node" value="" />\
+ </form>\
+ </div>\
+ </li>';
+
+ $(document).ready(function() {
+ init();
+ });
+})(jQuery);
+
+$(document).ready(function() {
+ // add comment anchors for all paragraphs that are commentable
+ $('.sphinx-has-comment').comment();
+
+ // highlight search words in search results
+ $("div.context").each(function() {
+ var params = $.getQueryParameters();
+ var terms = (params.q) ? params.q[0].split(/\s+/) : [];
+ var result = $(this);
+ $.each(terms, function() {
+ result.highlightText(this.toLowerCase(), 'highlighted');
+ });
+ });
+
+ // directly open comment window if requested
+ var anchor = document.location.hash;
+ if (anchor.substring(0, 9) == '#comment-') {
+ $('#ao' + anchor.substring(9)).click();
+ document.location.hash = '#s' + anchor.substring(9);
+ }
+});
Added: www-releases/trunk/3.8.0/projects/libcxx/docs/genindex.html
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/projects/libcxx/docs/genindex.html?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/projects/libcxx/docs/genindex.html (added)
+++ www-releases/trunk/3.8.0/projects/libcxx/docs/genindex.html Tue Mar 8 12:28:17 2016
@@ -0,0 +1,600 @@
+
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+ <title>Index — libc++ 3.8 documentation</title>
+
+ <link rel="stylesheet" href="_static/haiku.css" type="text/css" />
+ <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
+
+ <script type="text/javascript">
+ var DOCUMENTATION_OPTIONS = {
+ URL_ROOT: './',
+ VERSION: '3.8',
+ COLLAPSE_INDEX: false,
+ FILE_SUFFIX: '.html',
+ HAS_SOURCE: true
+ };
+ </script>
+ <script type="text/javascript" src="_static/jquery.js"></script>
+ <script type="text/javascript" src="_static/underscore.js"></script>
+ <script type="text/javascript" src="_static/doctools.js"></script>
+ <link rel="top" title="libc++ 3.8 documentation" href="index.html" />
+ </head>
+ <body>
+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>libc++ 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>Index</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ <a class="uplink" href="index.html">Contents</a>
+ </p>
+
+ </div>
+ <div class="content">
+
+
+
+<h1 id="index">Index</h1>
+
+<div class="genindex-jumpbox">
+ <a href="#C"><strong>C</strong></a>
+ | <a href="#D"><strong>D</strong></a>
+ | <a href="#E"><strong>E</strong></a>
+ | <a href="#L"><strong>L</strong></a>
+ | <a href="#N"><strong>N</strong></a>
+ | <a href="#S"><strong>S</strong></a>
+ | <a href="#U"><strong>U</strong></a>
+
+</div>
+<h2 id="C">C</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ color_diagnostics
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-color_diagnostics">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ command line option
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXXABI_USE_LLVM_UNWINDER">LIBCXXABI_USE_LLVM_UNWINDER:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ABI_UNSTABLE">LIBCXX_ABI_UNSTABLE:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ABI_VERSION">LIBCXX_ABI_VERSION:STRING</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_BUILD_32_BITS">LIBCXX_BUILD_32_BITS:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_CXX_ABI">LIBCXX_CXX_ABI:STRING</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_CXX_ABI_INCLUDE_PATHS">LIBCXX_CXX_ABI_INCLUDE_PATHS:PATHS</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_CXX_ABI_LIBRARY_PATH">LIBCXX_CXX_ABI_LIBRARY_PATH:PATH</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_ABI_LINKER_SCRIPT">LIBCXX_ENABLE_ABI_LINKER_SCRIPT:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_ASSERTIONS">LIBCXX_ENABLE_ASSERTIONS:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_EXCEPTIONS">LIBCXX_ENABLE_EXCEPTIONS:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_RTTI">LIBCXX_ENABLE_RTTI:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_SHARED">LIBCXX_ENABLE_SHARED:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_STATIC_ABI_LIBRARY">LIBCXX_ENABLE_STATIC_ABI_LIBRARY:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_LIBDIR_SUFFIX">LIBCXX_LIBDIR_SUFFIX:STRING</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LLVM_BUILD_32_BITS">LLVM_BUILD_32_BITS:BOOL</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LLVM_LIBDIR_SUFFIX">LLVM_LIBDIR_SUFFIX:STRING</a>
+ </dt>
+
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LLVM_LIT_ARGS">LLVM_LIT_ARGS:STRING</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ compile_flags="<list-of-args>"
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-compile_flags">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ cxx_under_test=<path/to/compiler>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-cxx_under_test">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+</tr></table>
+
+<h2 id="D">D</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ debug_level=<level>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-debug_level">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+</tr></table>
+
+<h2 id="E">E</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ environment variable
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#envvar-LIBCXX_COLOR_DIAGNOSTICS">LIBCXX_COLOR_DIAGNOSTICS</a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#envvar-LIBCXX_SITE_CONFIG=<path/to/lit.site.cfg>">LIBCXX_SITE_CONFIG=<path/to/lit.site.cfg></a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+</tr></table>
+
+<h2 id="L">L</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ LIBCXX_ABI_UNSTABLE:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ABI_UNSTABLE">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_ABI_VERSION:STRING
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ABI_VERSION">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_BUILD_32_BITS:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_BUILD_32_BITS">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_CXX_ABI:STRING
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_CXX_ABI">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_CXX_ABI_INCLUDE_PATHS:PATHS
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_CXX_ABI_INCLUDE_PATHS">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_CXX_ABI_LIBRARY_PATH:PATH
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_CXX_ABI_LIBRARY_PATH">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_ENABLE_ABI_LINKER_SCRIPT:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_ABI_LINKER_SCRIPT">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_ENABLE_ASSERTIONS:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_ASSERTIONS">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_ENABLE_EXCEPTIONS:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_EXCEPTIONS">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_ENABLE_RTTI:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_RTTI">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_ENABLE_SHARED:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_SHARED">command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ LIBCXX_ENABLE_STATIC_ABI_LIBRARY:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_ENABLE_STATIC_ABI_LIBRARY">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ libcxx_headers=<path/to/headers>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-libcxx_headers">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXX_LIBDIR_SUFFIX:STRING
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXX_LIBDIR_SUFFIX">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ libcxx_library=<path/to/libc++.so>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-libcxx_library">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ libcxx_site_config=<path/to/lit.site.cfg>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-libcxx_site_config">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LIBCXXABI_USE_LLVM_UNWINDER:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LIBCXXABI_USE_LLVM_UNWINDER">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ link_flags="<list-of-args>"
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-link_flags">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ lit command line option
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-color_diagnostics">color_diagnostics</a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-compile_flags">compile_flags="<list-of-args>"</a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-cxx_under_test">cxx_under_test=<path/to/compiler></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-debug_level">debug_level=<level></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-libcxx_headers">libcxx_headers=<path/to/headers></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-libcxx_library">libcxx_library=<path/to/libc++.so></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-libcxx_site_config">libcxx_site_config=<path/to/lit.site.cfg></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-link_flags">link_flags="<list-of-args>"</a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-no_default_flags">no_default_flags=<bool></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-std">std=<standard version></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-use_lit_shell">use_lit_shell=<bool></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-use_sanitizer">use_sanitizer=<sanitizer name></a>
+ </dt>
+
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-use_system_lib">use_system_lib=<bool></a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LLVM_BUILD_32_BITS:BOOL
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LLVM_BUILD_32_BITS">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LLVM_LIBDIR_SUFFIX:STRING
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LLVM_LIBDIR_SUFFIX">command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ LLVM_LIT_ARGS:STRING
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="BuildingLibcxx.html#cmdoption-arg-LLVM_LIT_ARGS">command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+</tr></table>
+
+<h2 id="N">N</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ no_default_flags=<bool>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-no_default_flags">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+</tr></table>
+
+<h2 id="S">S</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ std=<standard version>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-std">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+</tr></table>
+
+<h2 id="U">U</h2>
+<table style="width: 100%" class="indextable genindextable"><tr>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ use_lit_shell=<bool>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-use_lit_shell">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+
+ <dt>
+ use_sanitizer=<sanitizer name>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-use_sanitizer">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+ <td style="width: 33%" valign="top"><dl>
+
+ <dt>
+ use_system_lib=<bool>
+ </dt>
+
+ <dd><dl>
+
+ <dt><a href="TestingLibcxx.html#cmdoption-lit-arg-use_system_lib">lit command line option</a>
+ </dt>
+
+ </dl></dd>
+ </dl></td>
+</tr></table>
+
+
+
+ </div>
+ <div class="bottomnav">
+
+ <p>
+ <a class="uplink" href="index.html">Contents</a>
+ </p>
+
+ </div>
+
+ <div class="footer">
+ © Copyright 2011-2015, LLVM Project.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
+ </div>
+ </body>
+</html>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+ <title>âlibc++â C++ Standard Library — libc++ 3.8 documentation</title>
+
+ <link rel="stylesheet" href="_static/haiku.css" type="text/css" />
+ <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
+
+ <script type="text/javascript">
+ var DOCUMENTATION_OPTIONS = {
+ URL_ROOT: './',
+ VERSION: '3.8',
+ COLLAPSE_INDEX: false,
+ FILE_SUFFIX: '.html',
+ HAS_SOURCE: true
+ };
+ </script>
+ <script type="text/javascript" src="_static/jquery.js"></script>
+ <script type="text/javascript" src="_static/underscore.js"></script>
+ <script type="text/javascript" src="_static/doctools.js"></script>
+ <link rel="top" title="libc++ 3.8 documentation" href="#" />
+ <link rel="next" title="Using libc++" href="UsingLibcxx.html" />
+ </head>
+ <body>
+ <div class="header"><h1 class="heading"><a href="#">
+ <span>libc++ 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>âlibc++â C++ Standard Library</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ <a class="uplink" href="#">Contents</a>
+ ::
+ <a href="UsingLibcxx.html">Using libc++</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <div class="section" id="libc-c-standard-library">
+<span id="index"></span><h1>“libc++” C++ Standard Library<a class="headerlink" href="#libc-c-standard-library" title="Permalink to this headline">¶</a></h1>
+<div class="section" id="overview">
+<h2>Overview<a class="headerlink" href="#overview" title="Permalink to this headline">¶</a></h2>
+<p>libc++ is a new implementation of the C++ standard library, targeting C++11.</p>
+<ul class="simple">
+<li>Features and Goals<ul>
+<li>Correctness as defined by the C++11 standard.</li>
+<li>Fast execution.</li>
+<li>Minimal memory use.</li>
+<li>Fast compile times.</li>
+<li>ABI compatibility with gcc’s libstdc++ for some low-level features
+such as exception objects, rtti and memory allocation.</li>
+<li>Extensive unit tests.</li>
+</ul>
+</li>
+<li>Design and Implementation:<ul>
+<li>Extensive unit tests</li>
+<li>Internal linker model can be dumped/read to textual format</li>
+<li>Additional linking features can be plugged in as “passes”</li>
+<li>OS specific and CPU specific code factored out</li>
+</ul>
+</li>
+</ul>
+<div class="section" id="getting-started-with-libc">
+<h3>Getting Started with libc++<a class="headerlink" href="#getting-started-with-libc" title="Permalink to this headline">¶</a></h3>
+<div class="toctree-wrapper compound">
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="UsingLibcxx.html">Using libc++</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="UsingLibcxx.html#getting-started">Getting Started</a></li>
+<li class="toctree-l2"><a class="reference internal" href="UsingLibcxx.html#using-libc-on-linux">Using libc++ on Linux</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="BuildingLibcxx.html">Building libc++</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="BuildingLibcxx.html#getting-started">Getting Started</a></li>
+<li class="toctree-l2"><a class="reference internal" href="BuildingLibcxx.html#cmake-options">CMake Options</a></li>
+<li class="toctree-l2"><a class="reference internal" href="BuildingLibcxx.html#using-alternate-abi-libraries">Using Alternate ABI libraries</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="TestingLibcxx.html">Testing libc++</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="TestingLibcxx.html#getting-started">Getting Started</a></li>
+<li class="toctree-l2"><a class="reference internal" href="TestingLibcxx.html#lit-options">LIT Options</a></li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<div class="section" id="current-status">
+<h3>Current Status<a class="headerlink" href="#current-status" title="Permalink to this headline">¶</a></h3>
+<p>After its initial introduction, many people have asked “why start a new
+library instead of contributing to an existing library?” (like Apache’s
+libstdcxx, GNU’s libstdc++, STLport, etc). There are many contributing
+reasons, but some of the major ones are:</p>
+<ul class="simple">
+<li>From years of experience (including having implemented the standard
+library before), we’ve learned many things about implementing
+the standard containers which require ABI breakage and fundamental changes
+to how they are implemented. For example, it is generally accepted that
+building std::string using the “short string optimization” instead of
+using Copy On Write (COW) is a superior approach for multicore
+machines (particularly in C++11, which has rvalue references). Breaking
+ABI compatibility with old versions of the library was
+determined to be critical to achieving the performance goals of
+libc++.</li>
+<li>Mainline libstdc++ has switched to GPL3, a license which the developers
+of libc++ cannot use. libstdc++ 4.2 (the last GPL2 version) could be
+independently extended to support C++11, but this would be a fork of the
+codebase (which is often seen as worse for a project than starting a new
+independent one). Another problem with libstdc++ is that it is tightly
+integrated with G++ development, tending to be tied fairly closely to the
+matching version of G++.</li>
+<li>STLport and the Apache libstdcxx library are two other popular
+candidates, but both lack C++11 support. Our experience (and the
+experience of libstdc++ developers) is that adding support for C++11 (in
+particular rvalue references and move-only types) requires changes to
+almost every class and function, essentially amounting to a rewrite.
+Faced with a rewrite, we decided to start from scratch and evaluate every
+design decision from first principles based on experience.
+Further, both projects are apparently abandoned: STLport 5.2.1 was
+released in Oct‘08, and STDCXX 4.2.1 in May‘08.</li>
+</ul>
+</div>
+<div class="section" id="platform-and-compiler-support">
+<h3>Platform and Compiler Support<a class="headerlink" href="#platform-and-compiler-support" title="Permalink to this headline">¶</a></h3>
+<p>libc++ is known to work on the following platforms, using gcc-4.2 and
+clang (lack of C++11 language support disables some functionality).
+Note that functionality provided by <tt class="docutils literal"><span class="pre"><atomic></span></tt> is only functional with clang
+and GCC.</p>
+<table border="1" class="docutils">
+<colgroup>
+<col width="18%" />
+<col width="29%" />
+<col width="18%" />
+<col width="35%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">OS</th>
+<th class="head">Arch</th>
+<th class="head">Compilers</th>
+<th class="head">ABI Library</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>Mac OS X</td>
+<td>i386, x86_64</td>
+<td>Clang, GCC</td>
+<td>libc++abi</td>
+</tr>
+<tr class="row-odd"><td>FreeBSD 10+</td>
+<td>i386, x86_64, ARM</td>
+<td>Clang, GCC</td>
+<td>libcxxrt, libc++abi</td>
+</tr>
+<tr class="row-even"><td>Linux</td>
+<td>i386, x86_64</td>
+<td>Clang, GCC</td>
+<td>libc++abi</td>
+</tr>
+</tbody>
+</table>
+<p>The following minimum compiler versions are strongly recommended.</p>
+<ul class="simple">
+<li>Clang 3.5 and above</li>
+<li>GCC 4.7 and above.</li>
+</ul>
+<p>Anything older <em>may</em> work.</p>
+</div>
+<div class="section" id="c-dialect-support">
+<h3>C++ Dialect Support<a class="headerlink" href="#c-dialect-support" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li>C++11 - Complete</li>
+<li><a class="reference external" href="http://libcxx.llvm.org/cxx1y_status.html">C++14 - Complete</a></li>
+<li><a class="reference external" href="http://libcxx.llvm.org/cxx1z_status.html">C++1z - In Progress</a></li>
+<li><a class="reference external" href="http://libcxx.llvm.org/ts1z_status.html">Post C++14 Technical Specifications - In Progress</a></li>
+</ul>
+</div>
+<div class="section" id="notes-and-known-issues">
+<h3>Notes and Known Issues<a class="headerlink" href="#notes-and-known-issues" title="Permalink to this headline">¶</a></h3>
+<p>This list contains known issues with libc++</p>
+<ul class="simple">
+<li>Building libc++ with <tt class="docutils literal"><span class="pre">-fno-rtti</span></tt> is not supported. However
+linking against it with <tt class="docutils literal"><span class="pre">-fno-rtti</span></tt> is supported.</li>
+<li>On OS X v10.8 and older the CMake option <tt class="docutils literal"><span class="pre">-DLIBCXX_LIBCPPABI_VERSION=""</span></tt>
+must be used during configuration.</li>
+</ul>
+<p>A full list of currently open libc++ bugs can be <a class="reference external" href="https://llvm.org/bugs/buglist.cgi?component=All%20Bugs&product=libc%2B%2B&query_format=advanced&resolution=---&order=changeddate%20DESC%2Cassigned_to%20DESC%2Cbug_status%2Cpriority%2Cbug_id&list_id=74184">found here</a>.</p>
+</div>
+<div class="section" id="design-documents">
+<h3>Design Documents<a class="headerlink" href="#design-documents" title="Permalink to this headline">¶</a></h3>
+<div class="toctree-wrapper compound">
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="DesignDocs/CapturingConfigInfo.html">Capturing configuration information during installation</a></li>
+<li class="toctree-l1"><a class="reference internal" href="DesignDocs/ABIVersioning.html">Libc++ ABI stability</a></li>
+</ul>
+</div>
+<ul class="simple">
+<li><a class="reference external" href="http://libcxx.llvm.org/atomic_design.html"><atomic> design</a></li>
+<li><a class="reference external" href="http://libcxx.llvm.org/type_traits_design.html"><type_traits> design</a></li>
+<li><a class="reference external" href="http://libcxx.llvm.org/debug_mode.html">Status of debug mode</a></li>
+<li><a class="reference external" href="https://cplusplusmusings.wordpress.com/2012/07/05/clang-and-standard-libraries-on-mac-os-x/">Notes by Marshall Clow</a></li>
+</ul>
+</div>
+<div class="section" id="build-bots-and-test-coverage">
+<h3>Build Bots and Test Coverage<a class="headerlink" href="#build-bots-and-test-coverage" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><a class="reference external" href="http://lab.llvm.org:8011/console">LLVM Buildbot Builders</a></li>
+<li><a class="reference external" href="http://lab.llvm.org:8080/green/view/Libcxx/">Apple Jenkins Builders</a></li>
+<li><a class="reference external" href="http://ds2.efcs.ca:8080/console">EricWF’s Nightly Builders</a></li>
+<li><a class="reference external" href="http://efcs.ca/libcxx-coverage">Code Coverage Results</a></li>
+</ul>
+</div>
+</div>
+<div class="section" id="getting-involved">
+<h2>Getting Involved<a class="headerlink" href="#getting-involved" title="Permalink to this headline">¶</a></h2>
+<p>First please review our <a class="reference external" href="http://llvm.org/docs/DeveloperPolicy.html">Developer’s Policy</a>
+and <a class="reference external" href="http://llvm.org/docs/GettingStarted.html">Getting started with LLVM</a>.</p>
+<p><strong>Bug Reports</strong></p>
+<p>If you think you’ve found a bug in libc++, please report it using
+the <a class="reference external" href="http://llvm.org/bugs/">LLVM Bugzilla</a>. If you’re not sure, you
+can post a message to the <a class="reference external" href="http://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev mailing list</a> or on IRC.
+Please include “libc++” in your subject.</p>
+<p><strong>Patches</strong></p>
+<p>If you want to contribute a patch to libc++, the best place for that is
+<a class="reference external" href="http://llvm.org/docs/Phabricator.html">Phabricator</a>. Please include [libcxx] in the subject and
+add <cite>cfe-commits</cite> as a subscriber. Also make sure you are subscribed to the
+<a class="reference external" href="http://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits mailing list</a>.</p>
+<p><strong>Discussion and Questions</strong></p>
+<p>Send discussions and questions to the
+<a class="reference external" href="http://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev mailing list</a>.
+Please include [libcxx] in the subject.</p>
+</div>
+<div class="section" id="quick-links">
+<h2>Quick Links<a class="headerlink" href="#quick-links" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li><a class="reference external" href="http://llvm.org/">LLVM Homepage</a></li>
+<li><a class="reference external" href="http://libcxxabi.llvm.org/">libc++abi Homepage</a></li>
+<li><a class="reference external" href="http://llvm.org/bugs/">LLVM Bugzilla</a></li>
+<li><a class="reference external" href="http://lists.llvm.org/mailman/listinfo/cfe-commits">cfe-commits Mailing List</a></li>
+<li><a class="reference external" href="http://lists.llvm.org/mailman/listinfo/cfe-dev">cfe-dev Mailing List</a></li>
+<li><a class="reference external" href="http://llvm.org/svn/llvm-project/libcxx/trunk/">Browse libc++ – SVN</a></li>
+<li><a class="reference external" href="http://llvm.org/viewvc/llvm-project/libcxx/trunk/">Browse libc++ – ViewVC</a></li>
+</ul>
+</div>
+</div>
+
+
+ </div>
+ <div class="bottomnav">
+
+ <p>
+ <a class="uplink" href="#">Contents</a>
+ ::
+ <a href="UsingLibcxx.html">Using libc++</a> »
+ </p>
+
+ </div>
+
+ <div class="footer">
+ © Copyright 2011-2015, LLVM Project.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
+ </div>
+ </body>
+</html>
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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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+
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+ var DOCUMENTATION_OPTIONS = {
+ URL_ROOT: './',
+ VERSION: '3.8',
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+ };
+ </script>
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+ jQuery(function() { Search.loadIndex("searchindex.js"); });
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+ </head>
+ <body>
+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>libc++ 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>Search</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ <a class="uplink" href="index.html">Contents</a>
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <h1 id="search-documentation">Search</h1>
+ <div id="fallback" class="admonition warning">
+ <script type="text/javascript">$('#fallback').hide();</script>
+ <p>
+ Please activate JavaScript to enable the search
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+ From here you can search these documents. Enter your search
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+ <head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+ <title>AddressSanitizer — Clang 3.8 documentation</title>
+
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+ <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
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+ <body>
+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>Clang 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>AddressSanitizer</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ « <a href="ThreadSafetyAnalysis.html">Thread Safety Analysis</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="ThreadSanitizer.html">ThreadSanitizer</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <div class="section" id="addresssanitizer">
+<h1>AddressSanitizer<a class="headerlink" href="#addresssanitizer" title="Permalink to this headline">¶</a></h1>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#introduction" id="id1">Introduction</a></li>
+<li><a class="reference internal" href="#how-to-build" id="id2">How to build</a></li>
+<li><a class="reference internal" href="#usage" id="id3">Usage</a></li>
+<li><a class="reference internal" href="#symbolizing-the-reports" id="id4">Symbolizing the Reports</a></li>
+<li><a class="reference internal" href="#additional-checks" id="id5">Additional Checks</a><ul>
+<li><a class="reference internal" href="#initialization-order-checking" id="id6">Initialization order checking</a></li>
+<li><a class="reference internal" href="#memory-leak-detection" id="id7">Memory leak detection</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#issue-suppression" id="id8">Issue Suppression</a><ul>
+<li><a class="reference internal" href="#suppressing-reports-in-external-libraries" id="id9">Suppressing Reports in External Libraries</a></li>
+<li><a class="reference internal" href="#conditional-compilation-with-has-feature-address-sanitizer" id="id10">Conditional Compilation with <tt class="docutils literal"><span class="pre">__has_feature(address_sanitizer)</span></tt></a></li>
+<li><a class="reference internal" href="#disabling-instrumentation-with-attribute-no-sanitize-address" id="id11">Disabling Instrumentation with <tt class="docutils literal"><span class="pre">__attribute__((no_sanitize("address")))</span></tt></a></li>
+<li><a class="reference internal" href="#suppressing-errors-in-recompiled-code-blacklist" id="id12">Suppressing Errors in Recompiled Code (Blacklist)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#limitations" id="id13">Limitations</a></li>
+<li><a class="reference internal" href="#supported-platforms" id="id14">Supported Platforms</a></li>
+<li><a class="reference internal" href="#current-status" id="id15">Current Status</a></li>
+<li><a class="reference internal" href="#more-information" id="id16">More Information</a></li>
+</ul>
+</div>
+<div class="section" id="introduction">
+<h2><a class="toc-backref" href="#id1">Introduction</a><a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h2>
+<p>AddressSanitizer is a fast memory error detector. It consists of a compiler
+instrumentation module and a run-time library. The tool can detect the
+following types of bugs:</p>
+<ul class="simple">
+<li>Out-of-bounds accesses to heap, stack and globals</li>
+<li>Use-after-free</li>
+<li>Use-after-return (to some extent)</li>
+<li>Double-free, invalid free</li>
+<li>Memory leaks (experimental)</li>
+</ul>
+<p>Typical slowdown introduced by AddressSanitizer is <strong>2x</strong>.</p>
+</div>
+<div class="section" id="how-to-build">
+<h2><a class="toc-backref" href="#id2">How to build</a><a class="headerlink" href="#how-to-build" title="Permalink to this headline">¶</a></h2>
+<p>Build LLVM/Clang with <a class="reference external" href="http://llvm.org/docs/CMake.html">CMake</a>.</p>
+</div>
+<div class="section" id="usage">
+<h2><a class="toc-backref" href="#id3">Usage</a><a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
+<p>Simply compile and link your program with <tt class="docutils literal"><span class="pre">-fsanitize=address</span></tt> flag. The
+AddressSanitizer run-time library should be linked to the final executable, so
+make sure to use <tt class="docutils literal"><span class="pre">clang</span></tt> (not <tt class="docutils literal"><span class="pre">ld</span></tt>) for the final link step. When linking
+shared libraries, the AddressSanitizer run-time is not linked, so
+<tt class="docutils literal"><span class="pre">-Wl,-z,defs</span></tt> may cause link errors (don’t use it with AddressSanitizer). To
+get a reasonable performance add <tt class="docutils literal"><span class="pre">-O1</span></tt> or higher. To get nicer stack traces
+in error messages add <tt class="docutils literal"><span class="pre">-fno-omit-frame-pointer</span></tt>. To get perfect stack traces
+you may need to disable inlining (just use <tt class="docutils literal"><span class="pre">-O1</span></tt>) and tail call elimination
+(<tt class="docutils literal"><span class="pre">-fno-optimize-sibling-calls</span></tt>).</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="gp">%</span> cat example_UseAfterFree.cc
+<span class="go">int main(int argc, char **argv) {</span>
+<span class="go"> int *array = new int[100];</span>
+<span class="go"> delete [] array;</span>
+<span class="go"> return array[argc]; // BOOM</span>
+<span class="go">}</span>
+
+<span class="gp">#</span> Compile and link
+<span class="gp">%</span> clang -O1 -g -fsanitize<span class="o">=</span>address -fno-omit-frame-pointer example_UseAfterFree.cc
+</pre></div>
+</div>
+<p>or:</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="gp">#</span> Compile
+<span class="gp">%</span> clang -O1 -g -fsanitize<span class="o">=</span>address -fno-omit-frame-pointer -c example_UseAfterFree.cc
+<span class="gp">#</span> Link
+<span class="gp">%</span> clang -g -fsanitize<span class="o">=</span>address example_UseAfterFree.o
+</pre></div>
+</div>
+<p>If a bug is detected, the program will print an error message to stderr and
+exit with a non-zero exit code. AddressSanitizer exits on the first detected error.
+This is by design:</p>
+<ul class="simple">
+<li>This approach allows AddressSanitizer to produce faster and smaller generated code
+(both by ~5%).</li>
+<li>Fixing bugs becomes unavoidable. AddressSanitizer does not produce
+false alarms. Once a memory corruption occurs, the program is in an inconsistent
+state, which could lead to confusing results and potentially misleading
+subsequent reports.</li>
+</ul>
+<p>If your process is sandboxed and you are running on OS X 10.10 or earlier, you
+will need to set <tt class="docutils literal"><span class="pre">DYLD_INSERT_LIBRARIES</span></tt> environment variable and point it to
+the ASan library that is packaged with the compiler used to build the
+executable. (You can find the library by searching for dynamic libraries with
+<tt class="docutils literal"><span class="pre">asan</span></tt> in their name.) If the environment variable is not set, the process will
+try to re-exec. Also keep in mind that when moving the executable to another machine,
+the ASan library will also need to be copied over.</p>
+</div>
+<div class="section" id="symbolizing-the-reports">
+<h2><a class="toc-backref" href="#id4">Symbolizing the Reports</a><a class="headerlink" href="#symbolizing-the-reports" title="Permalink to this headline">¶</a></h2>
+<p>To make AddressSanitizer symbolize its output
+you need to set the <tt class="docutils literal"><span class="pre">ASAN_SYMBOLIZER_PATH</span></tt> environment variable to point to
+the <tt class="docutils literal"><span class="pre">llvm-symbolizer</span></tt> binary (or make sure <tt class="docutils literal"><span class="pre">llvm-symbolizer</span></tt> is in your
+<tt class="docutils literal"><span class="pre">$PATH</span></tt>):</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="gp">%</span> <span class="nv">ASAN_SYMBOLIZER_PATH</span><span class="o">=</span>/usr/local/bin/llvm-symbolizer ./a.out
+<span class="go">==9442== ERROR: AddressSanitizer heap-use-after-free on address 0x7f7ddab8c084 at pc 0x403c8c bp 0x7fff87fb82d0 sp 0x7fff87fb82c8</span>
+<span class="go">READ of size 4 at 0x7f7ddab8c084 thread T0</span>
+<span class="go"> #0 0x403c8c in main example_UseAfterFree.cc:4</span>
+<span class="go"> #1 0x7f7ddabcac4d in __libc_start_main ??:0</span>
+<span class="go">0x7f7ddab8c084 is located 4 bytes inside of 400-byte region [0x7f7ddab8c080,0x7f7ddab8c210)</span>
+<span class="go">freed by thread T0 here:</span>
+<span class="go"> #0 0x404704 in operator delete[](void*) ??:0</span>
+<span class="go"> #1 0x403c53 in main example_UseAfterFree.cc:4</span>
+<span class="go"> #2 0x7f7ddabcac4d in __libc_start_main ??:0</span>
+<span class="go">previously allocated by thread T0 here:</span>
+<span class="go"> #0 0x404544 in operator new[](unsigned long) ??:0</span>
+<span class="go"> #1 0x403c43 in main example_UseAfterFree.cc:2</span>
+<span class="go"> #2 0x7f7ddabcac4d in __libc_start_main ??:0</span>
+<span class="go">==9442== ABORTING</span>
+</pre></div>
+</div>
+<p>If that does not work for you (e.g. your process is sandboxed), you can use a
+separate script to symbolize the result offline (online symbolization can be
+force disabled by setting <tt class="docutils literal"><span class="pre">ASAN_OPTIONS=symbolize=0</span></tt>):</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="gp">%</span> <span class="nv">ASAN_OPTIONS</span><span class="o">=</span><span class="nv">symbolize</span><span class="o">=</span>0 ./a.out 2> log
+<span class="gp">%</span> projects/compiler-rt/lib/asan/scripts/asan_symbolize.py / < log | c++filt
+<span class="go">==9442== ERROR: AddressSanitizer heap-use-after-free on address 0x7f7ddab8c084 at pc 0x403c8c bp 0x7fff87fb82d0 sp 0x7fff87fb82c8</span>
+<span class="go">READ of size 4 at 0x7f7ddab8c084 thread T0</span>
+<span class="go"> #0 0x403c8c in main example_UseAfterFree.cc:4</span>
+<span class="go"> #1 0x7f7ddabcac4d in __libc_start_main ??:0</span>
+<span class="go">...</span>
+</pre></div>
+</div>
+<p>Note that on OS X you may need to run <tt class="docutils literal"><span class="pre">dsymutil</span></tt> on your binary to have the
+file:line info in the AddressSanitizer reports.</p>
+</div>
+<div class="section" id="additional-checks">
+<h2><a class="toc-backref" href="#id5">Additional Checks</a><a class="headerlink" href="#additional-checks" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="initialization-order-checking">
+<h3><a class="toc-backref" href="#id6">Initialization order checking</a><a class="headerlink" href="#initialization-order-checking" title="Permalink to this headline">¶</a></h3>
+<p>AddressSanitizer can optionally detect dynamic initialization order problems,
+when initialization of globals defined in one translation unit uses
+globals defined in another translation unit. To enable this check at runtime,
+you should set environment variable
+<tt class="docutils literal"><span class="pre">ASAN_OPTIONS=check_initialization_order=1</span></tt>.</p>
+<p>Note that this option is not supported on OS X.</p>
+</div>
+<div class="section" id="memory-leak-detection">
+<h3><a class="toc-backref" href="#id7">Memory leak detection</a><a class="headerlink" href="#memory-leak-detection" title="Permalink to this headline">¶</a></h3>
+<p>For more information on leak detector in AddressSanitizer, see
+<a class="reference internal" href="LeakSanitizer.html"><em>LeakSanitizer</em></a>. The leak detection is turned on by default on Linux;
+however, it is not yet supported on other platforms.</p>
+</div>
+</div>
+<div class="section" id="issue-suppression">
+<h2><a class="toc-backref" href="#id8">Issue Suppression</a><a class="headerlink" href="#issue-suppression" title="Permalink to this headline">¶</a></h2>
+<p>AddressSanitizer is not expected to produce false positives. If you see one,
+look again; most likely it is a true positive!</p>
+<div class="section" id="suppressing-reports-in-external-libraries">
+<h3><a class="toc-backref" href="#id9">Suppressing Reports in External Libraries</a><a class="headerlink" href="#suppressing-reports-in-external-libraries" title="Permalink to this headline">¶</a></h3>
+<p>Runtime interposition allows AddressSanitizer to find bugs in code that is
+not being recompiled. If you run into an issue in external libraries, we
+recommend immediately reporting it to the library maintainer so that it
+gets addressed. However, you can use the following suppression mechanism
+to unblock yourself and continue on with the testing. This suppression
+mechanism should only be used for suppressing issues in external code; it
+does not work on code recompiled with AddressSanitizer. To suppress errors
+in external libraries, set the <tt class="docutils literal"><span class="pre">ASAN_OPTIONS</span></tt> environment variable to point
+to a suppression file. You can either specify the full path to the file or the
+path of the file relative to the location of your executable.</p>
+<div class="highlight-bash"><div class="highlight"><pre><span class="nv">ASAN_OPTIONS</span><span class="o">=</span><span class="nv">suppressions</span><span class="o">=</span>MyASan.supp
+</pre></div>
+</div>
+<p>Use the following format to specify the names of the functions or libraries
+you want to suppress. You can see these in the error report. Remember that
+the narrower the scope of the suppression, the more bugs you will be able to
+catch.</p>
+<div class="highlight-bash"><div class="highlight"><pre>interceptor_via_fun:NameOfCFunctionToSuppress
+interceptor_via_fun:-<span class="o">[</span>ClassName objCMethodToSuppress:<span class="o">]</span>
+interceptor_via_lib:NameOfTheLibraryToSuppress
+</pre></div>
+</div>
+</div>
+<div class="section" id="conditional-compilation-with-has-feature-address-sanitizer">
+<h3><a class="toc-backref" href="#id10">Conditional Compilation with <tt class="docutils literal"><span class="pre">__has_feature(address_sanitizer)</span></tt></a><a class="headerlink" href="#conditional-compilation-with-has-feature-address-sanitizer" title="Permalink to this headline">¶</a></h3>
+<p>In some cases one may need to execute different code depending on whether
+AddressSanitizer is enabled.
+<a class="reference internal" href="LanguageExtensions.html#langext-has-feature-has-extension"><em>__has_feature</em></a> can be used for
+this purpose.</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="cp">#if defined(__has_feature)</span>
+<span class="cp"># if __has_feature(address_sanitizer)</span>
+<span class="c1">// code that builds only under AddressSanitizer</span>
+<span class="cp"># endif</span>
+<span class="cp">#endif</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="disabling-instrumentation-with-attribute-no-sanitize-address">
+<h3><a class="toc-backref" href="#id11">Disabling Instrumentation with <tt class="docutils literal"><span class="pre">__attribute__((no_sanitize("address")))</span></tt></a><a class="headerlink" href="#disabling-instrumentation-with-attribute-no-sanitize-address" title="Permalink to this headline">¶</a></h3>
+<p>Some code should not be instrumented by AddressSanitizer. One may use the
+function attribute <tt class="docutils literal"><span class="pre">__attribute__((no_sanitize("address")))</span></tt> (which has
+deprecated synonyms <cite>no_sanitize_address</cite> and <cite>no_address_safety_analysis</cite>) to
+disable instrumentation of a particular function. This attribute may not be
+supported by other compilers, so we suggest to use it together with
+<tt class="docutils literal"><span class="pre">__has_feature(address_sanitizer)</span></tt>.</p>
+</div>
+<div class="section" id="suppressing-errors-in-recompiled-code-blacklist">
+<h3><a class="toc-backref" href="#id12">Suppressing Errors in Recompiled Code (Blacklist)</a><a class="headerlink" href="#suppressing-errors-in-recompiled-code-blacklist" title="Permalink to this headline">¶</a></h3>
+<p>AddressSanitizer supports <tt class="docutils literal"><span class="pre">src</span></tt> and <tt class="docutils literal"><span class="pre">fun</span></tt> entity types in
+<a class="reference internal" href="SanitizerSpecialCaseList.html"><em>Sanitizer special case list</em></a>, that can be used to suppress error reports
+in the specified source files or functions. Additionally, AddressSanitizer
+introduces <tt class="docutils literal"><span class="pre">global</span></tt> and <tt class="docutils literal"><span class="pre">type</span></tt> entity types that can be used to
+suppress error reports for out-of-bound access to globals with certain
+names and types (you may only specify class or struct types).</p>
+<p>You may use an <tt class="docutils literal"><span class="pre">init</span></tt> category to suppress reports about initialization-order
+problems happening in certain source files or with certain global variables.</p>
+<div class="highlight-bash"><div class="highlight"><pre><span class="c"># Suppress error reports for code in a file or in a function:</span>
+src:bad_file.cpp
+<span class="c"># Ignore all functions with names containing MyFooBar:</span>
+fun:*MyFooBar*
+<span class="c"># Disable out-of-bound checks for global:</span>
+global:bad_array
+<span class="c"># Disable out-of-bound checks for global instances of a given class ...</span>
+<span class="nb">type</span>:Namespace::BadClassName
+<span class="c"># ... or a given struct. Use wildcard to deal with anonymous namespace.</span>
+<span class="nb">type</span>:Namespace2::*::BadStructName
+<span class="c"># Disable initialization-order checks for globals:</span>
+global:bad_init_global<span class="o">=</span>init
+<span class="nb">type</span>:*BadInitClassSubstring*<span class="o">=</span>init
+src:bad/init/files/*<span class="o">=</span>init
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="limitations">
+<h2><a class="toc-backref" href="#id13">Limitations</a><a class="headerlink" href="#limitations" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li>AddressSanitizer uses more real memory than a native run. Exact overhead
+depends on the allocations sizes. The smaller the allocations you make the
+bigger the overhead is.</li>
+<li>AddressSanitizer uses more stack memory. We have seen up to 3x increase.</li>
+<li>On 64-bit platforms AddressSanitizer maps (but not reserves) 16+ Terabytes of
+virtual address space. This means that tools like <tt class="docutils literal"><span class="pre">ulimit</span></tt> may not work as
+usually expected.</li>
+<li>Static linking is not supported.</li>
+</ul>
+</div>
+<div class="section" id="supported-platforms">
+<h2><a class="toc-backref" href="#id14">Supported Platforms</a><a class="headerlink" href="#supported-platforms" title="Permalink to this headline">¶</a></h2>
+<p>AddressSanitizer is supported on:</p>
+<ul class="simple">
+<li>Linux i386/x86_64 (tested on Ubuntu 12.04)</li>
+<li>OS X 10.7 - 10.11 (i386/x86_64)</li>
+<li>iOS Simulator</li>
+<li>Android ARM</li>
+<li>FreeBSD i386/x86_64 (tested on FreeBSD 11-current)</li>
+</ul>
+<p>Ports to various other platforms are in progress.</p>
+</div>
+<div class="section" id="current-status">
+<h2><a class="toc-backref" href="#id15">Current Status</a><a class="headerlink" href="#current-status" title="Permalink to this headline">¶</a></h2>
+<p>AddressSanitizer is fully functional on supported platforms starting from LLVM
+3.1. The test suite is integrated into CMake build and can be run with <tt class="docutils literal"><span class="pre">make</span>
+<span class="pre">check-asan</span></tt> command.</p>
+</div>
+<div class="section" id="more-information">
+<h2><a class="toc-backref" href="#id16">More Information</a><a class="headerlink" href="#more-information" title="Permalink to this headline">¶</a></h2>
+<p><a class="reference external" href="https://github.com/google/sanitizers/wiki/AddressSanitizer">https://github.com/google/sanitizers/wiki/AddressSanitizer</a></p>
+</div>
+</div>
+
+
+ </div>
+ <div class="bottomnav">
+
+ <p>
+ « <a href="ThreadSafetyAnalysis.html">Thread Safety Analysis</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="ThreadSanitizer.html">ThreadSanitizer</a> »
+ </p>
+
+ </div>
+
+ <div class="footer">
+ © Copyright 2007-2016, The Clang Team.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
+ </div>
+ </body>
+</html>
\ No newline at end of file
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@@ -0,0 +1,3426 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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+
+ <title>Attributes in Clang — Clang 3.8 documentation</title>
+
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+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>Clang 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>Attributes in Clang</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ « <a href="AutomaticReferenceCounting.html">Objective-C Automatic Reference Counting (ARC)</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="CrossCompilation.html">Cross-compilation using Clang</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <div class="section" id="attributes-in-clang">
+<h1>Attributes in Clang<a class="headerlink" href="#attributes-in-clang" title="Permalink to this headline">¶</a></h1>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#introduction" id="id5">Introduction</a></li>
+<li><a class="reference internal" href="#function-attributes" id="id6">Function Attributes</a><ul>
+<li><a class="reference internal" href="#interrupt" id="id7">interrupt</a></li>
+<li><a class="reference internal" href="#acquire-capability-acquire-shared-capability-clang-acquire-capability-clang-acquire-shared-capability" id="id8">acquire_capability (acquire_shared_capability, clang::acquire_capability, clang::acquire_shared_capability)</a></li>
+<li><a class="reference internal" href="#assert-capability-assert-shared-capability-clang-assert-capability-clang-assert-shared-capability" id="id9">assert_capability (assert_shared_capability, clang::assert_capability, clang::assert_shared_capability)</a></li>
+<li><a class="reference internal" href="#assume-aligned-gnu-assume-aligned" id="id10">assume_aligned (gnu::assume_aligned)</a></li>
+<li><a class="reference internal" href="#availability" id="id11">availability</a></li>
+<li><a class="reference internal" href="#noreturn" id="id12">_Noreturn</a></li>
+<li><a class="reference internal" href="#id1" id="id13">noreturn</a></li>
+<li><a class="reference internal" href="#carries-dependency" id="id14">carries_dependency</a></li>
+<li><a class="reference internal" href="#disable-tail-calls-clang-disable-tail-calls" id="id15">disable_tail_calls (clang::disable_tail_calls)</a></li>
+<li><a class="reference internal" href="#enable-if" id="id16">enable_if</a></li>
+<li><a class="reference internal" href="#flatten-gnu-flatten" id="id17">flatten (gnu::flatten)</a></li>
+<li><a class="reference internal" href="#format-gnu-format" id="id18">format (gnu::format)</a></li>
+<li><a class="reference internal" href="#internal-linkage-clang-internal-linkage" id="id19">internal_linkage (clang::internal_linkage)</a></li>
+<li><a class="reference internal" href="#id2" id="id20">interrupt</a></li>
+<li><a class="reference internal" href="#noalias" id="id21">noalias</a></li>
+<li><a class="reference internal" href="#noduplicate-clang-noduplicate" id="id22">noduplicate (clang::noduplicate)</a></li>
+<li><a class="reference internal" href="#no-sanitize-clang-no-sanitize" id="id23">no_sanitize (clang::no_sanitize)</a></li>
+<li><a class="reference internal" href="#no-sanitize-address-no-address-safety-analysis-gnu-no-address-safety-analysis-gnu-no-sanitize-address" id="id24">no_sanitize_address (no_address_safety_analysis, gnu::no_address_safety_analysis, gnu::no_sanitize_address)</a></li>
+<li><a class="reference internal" href="#no-sanitize-thread" id="id25">no_sanitize_thread</a></li>
+<li><a class="reference internal" href="#no-sanitize-memory" id="id26">no_sanitize_memory</a></li>
+<li><a class="reference internal" href="#no-split-stack-gnu-no-split-stack" id="id27">no_split_stack (gnu::no_split_stack)</a></li>
+<li><a class="reference internal" href="#not-tail-called-clang-not-tail-called" id="id28">not_tail_called (clang::not_tail_called)</a></li>
+<li><a class="reference internal" href="#objc-boxable" id="id29">objc_boxable</a></li>
+<li><a class="reference internal" href="#objc-method-family" id="id30">objc_method_family</a></li>
+<li><a class="reference internal" href="#objc-requires-super" id="id31">objc_requires_super</a></li>
+<li><a class="reference internal" href="#objc-runtime-name" id="id32">objc_runtime_name</a></li>
+<li><a class="reference internal" href="#optnone-clang-optnone" id="id33">optnone (clang::optnone)</a></li>
+<li><a class="reference internal" href="#overloadable" id="id34">overloadable</a></li>
+<li><a class="reference internal" href="#release-capability-release-shared-capability-clang-release-capability-clang-release-shared-capability" id="id35">release_capability (release_shared_capability, clang::release_capability, clang::release_shared_capability)</a></li>
+<li><a class="reference internal" href="#target-gnu-target" id="id36">target (gnu::target)</a></li>
+<li><a class="reference internal" href="#try-acquire-capability-try-acquire-shared-capability-clang-try-acquire-capability-clang-try-acquire-shared-capability" id="id37">try_acquire_capability (try_acquire_shared_capability, clang::try_acquire_capability, clang::try_acquire_shared_capability)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#variable-attributes" id="id38">Variable Attributes</a><ul>
+<li><a class="reference internal" href="#init-seg" id="id39">init_seg</a></li>
+<li><a class="reference internal" href="#pass-object-size" id="id40">pass_object_size</a></li>
+<li><a class="reference internal" href="#section-gnu-section-declspec-allocate" id="id41">section (gnu::section, __declspec(allocate))</a></li>
+<li><a class="reference internal" href="#tls-model-gnu-tls-model" id="id42">tls_model (gnu::tls_model)</a></li>
+<li><a class="reference internal" href="#thread" id="id43">thread</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#type-attributes" id="id44">Type Attributes</a><ul>
+<li><a class="reference internal" href="#align-value" id="id45">align_value</a></li>
+<li><a class="reference internal" href="#flag-enum" id="id46">flag_enum</a></li>
+<li><a class="reference internal" href="#single-inhertiance-multiple-inheritance-virtual-inheritance" id="id47">__single_inhertiance, __multiple_inheritance, __virtual_inheritance</a></li>
+<li><a class="reference internal" href="#novtable" id="id48">novtable</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#statement-attributes" id="id49">Statement Attributes</a><ul>
+<li><a class="reference internal" href="#fallthrough-clang-fallthrough" id="id50">fallthrough (clang::fallthrough)</a></li>
+<li><a class="reference internal" href="#pragma-clang-loop" id="id51">#pragma clang loop</a></li>
+<li><a class="reference internal" href="#pragma-unroll-pragma-nounroll" id="id52">#pragma unroll, #pragma nounroll</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#type-safety-checking" id="id53">Type Safety Checking</a><ul>
+<li><a class="reference internal" href="#argument-with-type-tag" id="id54">argument_with_type_tag</a></li>
+<li><a class="reference internal" href="#pointer-with-type-tag" id="id55">pointer_with_type_tag</a></li>
+<li><a class="reference internal" href="#type-tag-for-datatype" id="id56">type_tag_for_datatype</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#amd-gpu-register-attributes" id="id57">AMD GPU Register Attributes</a><ul>
+<li><a class="reference internal" href="#amdgpu-num-sgpr" id="id58">amdgpu_num_sgpr</a></li>
+<li><a class="reference internal" href="#amdgpu-num-vgpr" id="id59">amdgpu_num_vgpr</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#calling-conventions" id="id60">Calling Conventions</a><ul>
+<li><a class="reference internal" href="#fastcall-gnu-fastcall-fastcall-fastcall" id="id61">fastcall (gnu::fastcall, __fastcall, _fastcall)</a></li>
+<li><a class="reference internal" href="#ms-abi-gnu-ms-abi" id="id62">ms_abi (gnu::ms_abi)</a></li>
+<li><a class="reference internal" href="#pcs-gnu-pcs" id="id63">pcs (gnu::pcs)</a></li>
+<li><a class="reference internal" href="#regparm-gnu-regparm" id="id64">regparm (gnu::regparm)</a></li>
+<li><a class="reference internal" href="#stdcall-gnu-stdcall-stdcall-stdcall" id="id65">stdcall (gnu::stdcall, __stdcall, _stdcall)</a></li>
+<li><a class="reference internal" href="#thiscall-gnu-thiscall-thiscall-thiscall" id="id66">thiscall (gnu::thiscall, __thiscall, _thiscall)</a></li>
+<li><a class="reference internal" href="#vectorcall-vectorcall-vectorcall" id="id67">vectorcall (__vectorcall, _vectorcall)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#consumed-annotation-checking" id="id68">Consumed Annotation Checking</a><ul>
+<li><a class="reference internal" href="#callable-when" id="id69">callable_when</a></li>
+<li><a class="reference internal" href="#consumable" id="id70">consumable</a></li>
+<li><a class="reference internal" href="#param-typestate" id="id71">param_typestate</a></li>
+<li><a class="reference internal" href="#return-typestate" id="id72">return_typestate</a></li>
+<li><a class="reference internal" href="#set-typestate" id="id73">set_typestate</a></li>
+<li><a class="reference internal" href="#test-typestate" id="id74">test_typestate</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#opencl-address-spaces" id="id75">OpenCL Address Spaces</a><ul>
+<li><a class="reference internal" href="#constant-constant" id="id76">constant (__constant)</a></li>
+<li><a class="reference internal" href="#generic-generic" id="id77">generic (__generic)</a></li>
+<li><a class="reference internal" href="#global-global" id="id78">global (__global)</a></li>
+<li><a class="reference internal" href="#local-local" id="id79">local (__local)</a></li>
+<li><a class="reference internal" href="#private-private" id="id80">private (__private)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#nullability-attributes" id="id81">Nullability Attributes</a><ul>
+<li><a class="reference internal" href="#nonnull-gnu-nonnull" id="id82">nonnull (gnu::nonnull)</a></li>
+<li><a class="reference internal" href="#returns-nonnull-gnu-returns-nonnull" id="id83">returns_nonnull (gnu::returns_nonnull)</a></li>
+<li><a class="reference internal" href="#nonnull" id="id84">_Nonnull</a></li>
+<li><a class="reference internal" href="#null-unspecified" id="id85">_Null_unspecified</a></li>
+<li><a class="reference internal" href="#nullable" id="id86">_Nullable</a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="introduction">
+<h2><a class="toc-backref" href="#id5">Introduction</a><a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h2>
+<p>This page lists the attributes currently supported by Clang.</p>
+</div>
+<div class="section" id="function-attributes">
+<h2><a class="toc-backref" href="#id6">Function Attributes</a><a class="headerlink" href="#function-attributes" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="interrupt">
+<h3><a class="toc-backref" href="#id7">interrupt</a><a class="headerlink" href="#interrupt" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang supports the GNU style <tt class="docutils literal"><span class="pre">__attribute__((interrupt("TYPE")))</span></tt> attribute on
+ARM targets. This attribute may be attached to a function definition and
+instructs the backend to generate appropriate function entry/exit code so that
+it can be used directly as an interrupt service routine.</p>
+<p>The parameter passed to the interrupt attribute is optional, but if
+provided it must be a string literal with one of the following values: “IRQ”,
+“FIQ”, “SWI”, “ABORT”, “UNDEF”.</p>
+<p>The semantics are as follows:</p>
+<ul>
+<li><p class="first">If the function is AAPCS, Clang instructs the backend to realign the stack to
+8 bytes on entry. This is a general requirement of the AAPCS at public
+interfaces, but may not hold when an exception is taken. Doing this allows
+other AAPCS functions to be called.</p>
+</li>
+<li><p class="first">If the CPU is M-class this is all that needs to be done since the architecture
+itself is designed in such a way that functions obeying the normal AAPCS ABI
+constraints are valid exception handlers.</p>
+</li>
+<li><p class="first">If the CPU is not M-class, the prologue and epilogue are modified to save all
+non-banked registers that are used, so that upon return the user-mode state
+will not be corrupted. Note that to avoid unnecessary overhead, only
+general-purpose (integer) registers are saved in this way. If VFP operations
+are needed, that state must be saved manually.</p>
+<p>Specifically, interrupt kinds other than “FIQ” will save all core registers
+except “lr” and “sp”. “FIQ” interrupts will save r0-r7.</p>
+</li>
+<li><p class="first">If the CPU is not M-class, the return instruction is changed to one of the
+canonical sequences permitted by the architecture for exception return. Where
+possible the function itself will make the necessary “lr” adjustments so that
+the “preferred return address” is selected.</p>
+<p>Unfortunately the compiler is unable to make this guarantee for an “UNDEF”
+handler, where the offset from “lr” to the preferred return address depends on
+the execution state of the code which generated the exception. In this case
+a sequence equivalent to “movs pc, lr” will be used.</p>
+</li>
+</ul>
+</div>
+<div class="section" id="acquire-capability-acquire-shared-capability-clang-acquire-capability-clang-acquire-shared-capability">
+<h3><a class="toc-backref" href="#id8">acquire_capability (acquire_shared_capability, clang::acquire_capability, clang::acquire_shared_capability)</a><a class="headerlink" href="#acquire-capability-acquire-shared-capability-clang-acquire-capability-clang-acquire-shared-capability" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Marks a function as acquiring a capability.</p>
+</div>
+<div class="section" id="assert-capability-assert-shared-capability-clang-assert-capability-clang-assert-shared-capability">
+<h3><a class="toc-backref" href="#id9">assert_capability (assert_shared_capability, clang::assert_capability, clang::assert_shared_capability)</a><a class="headerlink" href="#assert-capability-assert-shared-capability-clang-assert-capability-clang-assert-shared-capability" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Marks a function that dynamically tests whether a capability is held, and halts
+the program if it is not held.</p>
+</div>
+<div class="section" id="assume-aligned-gnu-assume-aligned">
+<h3><a class="toc-backref" href="#id10">assume_aligned (gnu::assume_aligned)</a><a class="headerlink" href="#assume-aligned-gnu-assume-aligned" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Use <tt class="docutils literal"><span class="pre">__attribute__((assume_aligned(<alignment>[,<offset>]))</span></tt> on a function
+declaration to specify that the return value of the function (which must be a
+pointer type) has the specified offset, in bytes, from an address with the
+specified alignment. The offset is taken to be zero if omitted.</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="c1">// The returned pointer value has 32-byte alignment.</span>
+<span class="kt">void</span> <span class="o">*</span><span class="nf">a</span><span class="p">()</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">assume_aligned</span> <span class="p">(</span><span class="mi">32</span><span class="p">)));</span>
+
+<span class="c1">// The returned pointer value is 4 bytes greater than an address having</span>
+<span class="c1">// 32-byte alignment.</span>
+<span class="kt">void</span> <span class="o">*</span><span class="nf">b</span><span class="p">()</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">assume_aligned</span> <span class="p">(</span><span class="mi">32</span><span class="p">,</span> <span class="mi">4</span><span class="p">)));</span>
+</pre></div>
+</div>
+<p>Note that this attribute provides information to the compiler regarding a
+condition that the code already ensures is true. It does not cause the compiler
+to enforce the provided alignment assumption.</p>
+</div>
+<div class="section" id="availability">
+<h3><a class="toc-backref" href="#id11">availability</a><a class="headerlink" href="#availability" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">availability</span></tt> attribute can be placed on declarations to describe the
+lifecycle of that declaration relative to operating system versions. Consider
+the function declaration for a hypothetical function <tt class="docutils literal"><span class="pre">f</span></tt>:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">f</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.4</span><span class="p">,</span><span class="n">deprecated</span><span class="o">=</span><span class="mf">10.6</span><span class="p">,</span><span class="n">obsoleted</span><span class="o">=</span><span class="mf">10.7</span><span class="p">)));</span>
+</pre></div>
+</div>
+<p>The availability attribute states that <tt class="docutils literal"><span class="pre">f</span></tt> was introduced in Mac OS X 10.4,
+deprecated in Mac OS X 10.6, and obsoleted in Mac OS X 10.7. This information
+is used by Clang to determine when it is safe to use <tt class="docutils literal"><span class="pre">f</span></tt>: for example, if
+Clang is instructed to compile code for Mac OS X 10.5, a call to <tt class="docutils literal"><span class="pre">f()</span></tt>
+succeeds. If Clang is instructed to compile code for Mac OS X 10.6, the call
+succeeds but Clang emits a warning specifying that the function is deprecated.
+Finally, if Clang is instructed to compile code for Mac OS X 10.7, the call
+fails because <tt class="docutils literal"><span class="pre">f()</span></tt> is no longer available.</p>
+<p>The availability attribute is a comma-separated list starting with the
+platform name and then including clauses specifying important milestones in the
+declaration’s lifetime (in any order) along with additional information. Those
+clauses can be:</p>
+<dl class="docutils">
+<dt>introduced=<em>version</em></dt>
+<dd>The first version in which this declaration was introduced.</dd>
+<dt>deprecated=<em>version</em></dt>
+<dd>The first version in which this declaration was deprecated, meaning that
+users should migrate away from this API.</dd>
+<dt>obsoleted=<em>version</em></dt>
+<dd>The first version in which this declaration was obsoleted, meaning that it
+was removed completely and can no longer be used.</dd>
+<dt>unavailable</dt>
+<dd>This declaration is never available on this platform.</dd>
+<dt>message=<em>string-literal</em></dt>
+<dd>Additional message text that Clang will provide when emitting a warning or
+error about use of a deprecated or obsoleted declaration. Useful to direct
+users to replacement APIs.</dd>
+</dl>
+<p>Multiple availability attributes can be placed on a declaration, which may
+correspond to different platforms. Only the availability attribute with the
+platform corresponding to the target platform will be used; any others will be
+ignored. If no availability attribute specifies availability for the current
+target platform, the availability attributes are ignored. Supported platforms
+are:</p>
+<dl class="docutils">
+<dt><tt class="docutils literal"><span class="pre">ios</span></tt></dt>
+<dd>Apple’s iOS operating system. The minimum deployment target is specified by
+the <tt class="docutils literal"><span class="pre">-mios-version-min=*version*</span></tt> or <tt class="docutils literal"><span class="pre">-miphoneos-version-min=*version*</span></tt>
+command-line arguments.</dd>
+<dt><tt class="docutils literal"><span class="pre">macosx</span></tt></dt>
+<dd>Apple’s Mac OS X operating system. The minimum deployment target is
+specified by the <tt class="docutils literal"><span class="pre">-mmacosx-version-min=*version*</span></tt> command-line argument.</dd>
+<dt><tt class="docutils literal"><span class="pre">tvos</span></tt></dt>
+<dd>Apple’s tvOS operating system. The minimum deployment target is specified by
+the <tt class="docutils literal"><span class="pre">-mtvos-version-min=*version*</span></tt> command-line argument.</dd>
+<dt><tt class="docutils literal"><span class="pre">watchos</span></tt></dt>
+<dd>Apple’s watchOS operating system. The minimum deployment target is specified by
+the <tt class="docutils literal"><span class="pre">-mwatchos-version-min=*version*</span></tt> command-line argument.</dd>
+</dl>
+<p>A declaration can be used even when deploying back to a platform version prior
+to when the declaration was introduced. When this happens, the declaration is
+<a class="reference external" href="https://developer.apple.com/library/mac/#documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html">weakly linked</a>,
+as if the <tt class="docutils literal"><span class="pre">weak_import</span></tt> attribute were added to the declaration. A
+weakly-linked declaration may or may not be present a run-time, and a program
+can determine whether the declaration is present by checking whether the
+address of that declaration is non-NULL.</p>
+<p>If there are multiple declarations of the same entity, the availability
+attributes must either match on a per-platform basis or later
+declarations must not have availability attributes for that
+platform. For example:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">g</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.4</span><span class="p">)));</span>
+<span class="kt">void</span> <span class="nf">g</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.4</span><span class="p">)));</span> <span class="c1">// okay, matches</span>
+<span class="kt">void</span> <span class="nf">g</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">ios</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">4.0</span><span class="p">)));</span> <span class="c1">// okay, adds a new platform</span>
+<span class="kt">void</span> <span class="nf">g</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// okay, inherits both macosx and ios availability from above.</span>
+<span class="kt">void</span> <span class="nf">g</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.5</span><span class="p">)));</span> <span class="c1">// error: mismatch</span>
+</pre></div>
+</div>
+<p>When one method overrides another, the overriding method can be more widely available than the overridden method, e.g.,:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="k">@interface</span> <span class="nc">A</span>
+<span class="k">-</span> <span class="p">(</span><span class="kt">id</span><span class="p">)</span><span class="nf">method</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.4</span><span class="p">)));</span>
+<span class="k">-</span> <span class="p">(</span><span class="kt">id</span><span class="p">)</span><span class="nf">method2</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.4</span><span class="p">)));</span>
+<span class="k">@end</span>
+
+<span class="k">@interface</span> <span class="nc">B</span> : <span class="nc">A</span>
+<span class="k">-</span> <span class="p">(</span><span class="kt">id</span><span class="p">)</span><span class="nf">method</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.3</span><span class="p">)));</span> <span class="c1">// okay: method moved into base class later</span>
+<span class="k">-</span> <span class="p">(</span><span class="kt">id</span><span class="p">)</span><span class="nf">method</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">availability</span><span class="p">(</span><span class="n">macosx</span><span class="p">,</span><span class="n">introduced</span><span class="o">=</span><span class="mf">10.5</span><span class="p">)));</span> <span class="c1">// error: this method was available via the base class in 10.4</span>
+<span class="k">@end</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="noreturn">
+<h3><a class="toc-backref" href="#id12">_Noreturn</a><a class="headerlink" href="#noreturn" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>A function declared as <tt class="docutils literal"><span class="pre">_Noreturn</span></tt> shall not return to its caller. The
+compiler will generate a diagnostic for a function declared as <tt class="docutils literal"><span class="pre">_Noreturn</span></tt>
+that appears to be capable of returning to its caller.</p>
+</div>
+<div class="section" id="id1">
+<h3><a class="toc-backref" href="#id13">noreturn</a><a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>A function declared as <tt class="docutils literal"><span class="pre">[[noreturn]]</span></tt> shall not return to its caller. The
+compiler will generate a diagnostic for a function declared as <tt class="docutils literal"><span class="pre">[[noreturn]]</span></tt>
+that appears to be capable of returning to its caller.</p>
+</div>
+<div class="section" id="carries-dependency">
+<h3><a class="toc-backref" href="#id14">carries_dependency</a><a class="headerlink" href="#carries-dependency" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">carries_dependency</span></tt> attribute specifies dependency propagation into and
+out of functions.</p>
+<p>When specified on a function or Objective-C method, the <tt class="docutils literal"><span class="pre">carries_dependency</span></tt>
+attribute means that the return value carries a dependency out of the function,
+so that the implementation need not constrain ordering upon return from that
+function. Implementations of the function and its caller may choose to preserve
+dependencies instead of emitting memory ordering instructions such as fences.</p>
+<p>Note, this attribute does not change the meaning of the program, but may result
+in generation of more efficient code.</p>
+</div>
+<div class="section" id="disable-tail-calls-clang-disable-tail-calls">
+<h3><a class="toc-backref" href="#id15">disable_tail_calls (clang::disable_tail_calls)</a><a class="headerlink" href="#disable-tail-calls-clang-disable-tail-calls" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">disable_tail_calls</span></tt> attribute instructs the backend to not perform tail call optimization inside the marked function.</p>
+<p>For example:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">callee</span><span class="p">(</span><span class="kt">int</span><span class="p">);</span>
+
+<span class="kt">int</span> <span class="nf">foo</span><span class="p">(</span><span class="kt">int</span> <span class="n">a</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">disable_tail_calls</span><span class="p">))</span> <span class="p">{</span>
+ <span class="k">return</span> <span class="n">callee</span><span class="p">(</span><span class="n">a</span><span class="p">);</span> <span class="c1">// This call is not tail-call optimized.</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>Marking virtual functions as <tt class="docutils literal"><span class="pre">disable_tail_calls</span></tt> is legal.</p>
+<blockquote>
+<div></div></blockquote>
+</div>
+<div class="section" id="enable-if">
+<h3><a class="toc-backref" href="#id16">enable_if</a><a class="headerlink" href="#enable-if" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Some features of this attribute are experimental. The meaning of
+multiple enable_if attributes on a single declaration is subject to change in
+a future version of clang. Also, the ABI is not standardized and the name
+mangling may change in future versions. To avoid that, use asm labels.</p>
+</div>
+<p>The <tt class="docutils literal"><span class="pre">enable_if</span></tt> attribute can be placed on function declarations to control
+which overload is selected based on the values of the function’s arguments.
+When combined with the <tt class="docutils literal"><span class="pre">overloadable</span></tt> attribute, this feature is also
+available in C.</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">isdigit</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">);</span>
+<span class="kt">int</span> <span class="nf">isdigit</span><span class="p">(</span><span class="kt">int</span> <span class="n">c</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="n">c</span> <span class="o"><=</span> <span class="o">-</span><span class="mi">1</span> <span class="o">||</span> <span class="n">c</span> <span class="o">></span> <span class="mi">255</span><span class="p">,</span> <span class="s">"chosen when 'c' is out of range"</span><span class="p">)))</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">unavailable</span><span class="p">(</span><span class="s">"'c' must have the value of an unsigned char or EOF"</span><span class="p">)));</span>
+
+<span class="kt">void</span> <span class="nf">foo</span><span class="p">(</span><span class="kt">char</span> <span class="n">c</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">isdigit</span><span class="p">(</span><span class="n">c</span><span class="p">);</span>
+ <span class="n">isdigit</span><span class="p">(</span><span class="mi">10</span><span class="p">);</span>
+ <span class="n">isdigit</span><span class="p">(</span><span class="o">-</span><span class="mi">10</span><span class="p">);</span> <span class="c1">// results in a compile-time error.</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>The enable_if attribute takes two arguments, the first is an expression written
+in terms of the function parameters, the second is a string explaining why this
+overload candidate could not be selected to be displayed in diagnostics. The
+expression is part of the function signature for the purposes of determining
+whether it is a redeclaration (following the rules used when determining
+whether a C++ template specialization is ODR-equivalent), but is not part of
+the type.</p>
+<p>The enable_if expression is evaluated as if it were the body of a
+bool-returning constexpr function declared with the arguments of the function
+it is being applied to, then called with the parameters at the call site. If the
+result is false or could not be determined through constant expression
+evaluation, then this overload will not be chosen and the provided string may
+be used in a diagnostic if the compile fails as a result.</p>
+<p>Because the enable_if expression is an unevaluated context, there are no global
+state changes, nor the ability to pass information from the enable_if
+expression to the function body. For example, suppose we want calls to
+strnlen(strbuf, maxlen) to resolve to strnlen_chk(strbuf, maxlen, size of
+strbuf) only if the size of strbuf can be determined:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="n">__attribute__</span><span class="p">((</span><span class="n">always_inline</span><span class="p">))</span>
+<span class="k">static</span> <span class="kr">inline</span> <span class="kt">size_t</span> <span class="n">strnlen</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">s</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">maxlen</span><span class="p">)</span>
+ <span class="n">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">))</span>
+ <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="n">__builtin_object_size</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">1</span><span class="p">))),</span>
+ <span class="s">"chosen when the buffer size is known but 'maxlen' is not"</span><span class="p">)))</span>
+<span class="p">{</span>
+ <span class="k">return</span> <span class="n">strnlen_chk</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">maxlen</span><span class="p">,</span> <span class="n">__builtin_object_size</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="mi">0</span><span class="p">));</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Multiple enable_if attributes may be applied to a single declaration. In this
+case, the enable_if expressions are evaluated from left to right in the
+following manner. First, the candidates whose enable_if expressions evaluate to
+false or cannot be evaluated are discarded. If the remaining candidates do not
+share ODR-equivalent enable_if expressions, the overload resolution is
+ambiguous. Otherwise, enable_if overload resolution continues with the next
+enable_if attribute on the candidates that have not been discarded and have
+remaining enable_if attributes. In this way, we pick the most specific
+overload out of a number of viable overloads using enable_if.</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">f</span><span class="p">()</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="nb">true</span><span class="p">,</span> <span class="s">""</span><span class="p">)));</span> <span class="c1">// #1</span>
+<span class="kt">void</span> <span class="nf">f</span><span class="p">()</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="nb">true</span><span class="p">,</span> <span class="s">""</span><span class="p">)))</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="nb">true</span><span class="p">,</span> <span class="s">""</span><span class="p">)));</span> <span class="c1">// #2</span>
+
+<span class="kt">void</span> <span class="nf">g</span><span class="p">(</span><span class="kt">int</span> <span class="n">i</span><span class="p">,</span> <span class="kt">int</span> <span class="n">j</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="s">""</span><span class="p">)));</span> <span class="c1">// #1</span>
+<span class="kt">void</span> <span class="nf">g</span><span class="p">(</span><span class="kt">int</span> <span class="n">i</span><span class="p">,</span> <span class="kt">int</span> <span class="n">j</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="n">j</span><span class="p">,</span> <span class="s">""</span><span class="p">)))</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">enable_if</span><span class="p">(</span><span class="nb">true</span><span class="p">)));</span> <span class="c1">// #2</span>
+</pre></div>
+</div>
+<p>In this example, a call to f() is always resolved to #2, as the first enable_if
+expression is ODR-equivalent for both declarations, but #1 does not have another
+enable_if expression to continue evaluating, so the next round of evaluation has
+only a single candidate. In a call to g(1, 1), the call is ambiguous even though
+#2 has more enable_if attributes, because the first enable_if expressions are
+not ODR-equivalent.</p>
+<p>Query for this feature with <tt class="docutils literal"><span class="pre">__has_attribute(enable_if)</span></tt>.</p>
+</div>
+<div class="section" id="flatten-gnu-flatten">
+<h3><a class="toc-backref" href="#id17">flatten (gnu::flatten)</a><a class="headerlink" href="#flatten-gnu-flatten" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">flatten</span></tt> attribute causes calls within the attributed function to
+be inlined unless it is impossible to do so, for example if the body of the
+callee is unavailable or if the callee has the <tt class="docutils literal"><span class="pre">noinline</span></tt> attribute.</p>
+</div>
+<div class="section" id="format-gnu-format">
+<h3><a class="toc-backref" href="#id18">format (gnu::format)</a><a class="headerlink" href="#format-gnu-format" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang supports the <tt class="docutils literal"><span class="pre">format</span></tt> attribute, which indicates that the function
+accepts a <tt class="docutils literal"><span class="pre">printf</span></tt> or <tt class="docutils literal"><span class="pre">scanf</span></tt>-like format string and corresponding
+arguments or a <tt class="docutils literal"><span class="pre">va_list</span></tt> that contains these arguments.</p>
+<p>Please see <a class="reference external" href="http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html">GCC documentation about format attribute</a> to find details
+about attribute syntax.</p>
+<p>Clang implements two kinds of checks with this attribute.</p>
+<ol class="arabic">
+<li><p class="first">Clang checks that the function with the <tt class="docutils literal"><span class="pre">format</span></tt> attribute is called with
+a format string that uses format specifiers that are allowed, and that
+arguments match the format string. This is the <tt class="docutils literal"><span class="pre">-Wformat</span></tt> warning, it is
+on by default.</p>
+</li>
+<li><p class="first">Clang checks that the format string argument is a literal string. This is
+the <tt class="docutils literal"><span class="pre">-Wformat-nonliteral</span></tt> warning, it is off by default.</p>
+<p>Clang implements this mostly the same way as GCC, but there is a difference
+for functions that accept a <tt class="docutils literal"><span class="pre">va_list</span></tt> argument (for example, <tt class="docutils literal"><span class="pre">vprintf</span></tt>).
+GCC does not emit <tt class="docutils literal"><span class="pre">-Wformat-nonliteral</span></tt> warning for calls to such
+functions. Clang does not warn if the format string comes from a function
+parameter, where the function is annotated with a compatible attribute,
+otherwise it warns. For example:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">__attribute__</span><span class="p">((</span><span class="n">__format__</span> <span class="p">(</span><span class="n">__scanf__</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">)))</span>
+<span class="kt">void</span> <span class="n">foo</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">s</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span> <span class="p">...)</span> <span class="p">{</span>
+ <span class="kt">va_list</span> <span class="n">ap</span><span class="p">;</span>
+ <span class="n">va_start</span><span class="p">(</span><span class="n">ap</span><span class="p">,</span> <span class="n">buf</span><span class="p">);</span>
+
+ <span class="n">vprintf</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">ap</span><span class="p">);</span> <span class="c1">// warning: format string is not a string literal</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>In this case we warn because <tt class="docutils literal"><span class="pre">s</span></tt> contains a format string for a
+<tt class="docutils literal"><span class="pre">scanf</span></tt>-like function, but it is passed to a <tt class="docutils literal"><span class="pre">printf</span></tt>-like function.</p>
+<p>If the attribute is removed, clang still warns, because the format string is
+not a string literal.</p>
+<p>Another example:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">__attribute__</span><span class="p">((</span><span class="n">__format__</span> <span class="p">(</span><span class="n">__printf__</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">)))</span>
+<span class="kt">void</span> <span class="n">foo</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span><span class="o">*</span> <span class="n">s</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span> <span class="p">...)</span> <span class="p">{</span>
+ <span class="kt">va_list</span> <span class="n">ap</span><span class="p">;</span>
+ <span class="n">va_start</span><span class="p">(</span><span class="n">ap</span><span class="p">,</span> <span class="n">buf</span><span class="p">);</span>
+
+ <span class="n">vprintf</span><span class="p">(</span><span class="n">s</span><span class="p">,</span> <span class="n">ap</span><span class="p">);</span> <span class="c1">// warning</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>In this case Clang does not warn because the format string <tt class="docutils literal"><span class="pre">s</span></tt> and
+the corresponding arguments are annotated. If the arguments are
+incorrect, the caller of <tt class="docutils literal"><span class="pre">foo</span></tt> will receive a warning.</p>
+</li>
+</ol>
+</div>
+<div class="section" id="internal-linkage-clang-internal-linkage">
+<h3><a class="toc-backref" href="#id19">internal_linkage (clang::internal_linkage)</a><a class="headerlink" href="#internal-linkage-clang-internal-linkage" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">internal_linkage</span></tt> attribute changes the linkage type of the declaration to internal.
+This is similar to C-style <tt class="docutils literal"><span class="pre">static</span></tt>, but can be used on classes and class methods. When applied to a class definition,
+this attribute affects all methods and static data members of that class.
+This can be used to contain the ABI of a C++ library by excluding unwanted class methods from the export tables.</p>
+</div>
+<div class="section" id="id2">
+<h3><a class="toc-backref" href="#id20">interrupt</a><a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang supports the GNU style <tt class="docutils literal"><span class="pre">__attribute__((interrupt("ARGUMENT")))</span></tt> attribute on
+MIPS targets. This attribute may be attached to a function definition and instructs
+the backend to generate appropriate function entry/exit code so that it can be used
+directly as an interrupt service routine.</p>
+<p>By default, the compiler will produce a function prologue and epilogue suitable for
+an interrupt service routine that handles an External Interrupt Controller (eic)
+generated interrupt. This behaviour can be explicitly requested with the “eic”
+argument.</p>
+<p>Otherwise, for use with vectored interrupt mode, the argument passed should be
+of the form “vector=LEVEL” where LEVEL is one of the following values:
+“sw0”, “sw1”, “hw0”, “hw1”, “hw2”, “hw3”, “hw4”, “hw5”. The compiler will
+then set the interrupt mask to the corresponding level which will mask all
+interrupts up to and including the argument.</p>
+<p>The semantics are as follows:</p>
+<ul class="simple">
+<li>The prologue is modified so that the Exception Program Counter (EPC) and
+Status coprocessor registers are saved to the stack. The interrupt mask is
+set so that the function can only be interrupted by a higher priority
+interrupt. The epilogue will restore the previous values of EPC and Status.</li>
+<li>The prologue and epilogue are modified to save and restore all non-kernel
+registers as necessary.</li>
+<li>The FPU is disabled in the prologue, as the floating pointer registers are not
+spilled to the stack.</li>
+<li>The function return sequence is changed to use an exception return instruction.</li>
+<li>The parameter sets the interrupt mask for the function corresponding to the
+interrupt level specified. If no mask is specified the interrupt mask
+defaults to “eic”.</li>
+</ul>
+</div>
+<div class="section" id="noalias">
+<h3><a class="toc-backref" href="#id21">noalias</a><a class="headerlink" href="#noalias" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">noalias</span></tt> attribute indicates that the only memory accesses inside
+function are loads and stores from objects pointed to by its pointer-typed
+arguments, with arbitrary offsets.</p>
+</div>
+<div class="section" id="noduplicate-clang-noduplicate">
+<h3><a class="toc-backref" href="#id22">noduplicate (clang::noduplicate)</a><a class="headerlink" href="#noduplicate-clang-noduplicate" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">noduplicate</span></tt> attribute can be placed on function declarations to control
+whether function calls to this function can be duplicated or not as a result of
+optimizations. This is required for the implementation of functions with
+certain special requirements, like the OpenCL “barrier” function, that might
+need to be run concurrently by all the threads that are executing in lockstep
+on the hardware. For example this attribute applied on the function
+“nodupfunc” in the code below avoids that:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">nodupfunc</span><span class="p">()</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">noduplicate</span><span class="p">));</span>
+<span class="c1">// Setting it as a C++11 attribute is also valid</span>
+<span class="c1">// void nodupfunc() [[clang::noduplicate]];</span>
+<span class="kt">void</span> <span class="nf">foo</span><span class="p">();</span>
+<span class="kt">void</span> <span class="nf">bar</span><span class="p">();</span>
+
+<span class="n">nodupfunc</span><span class="p">();</span>
+<span class="k">if</span> <span class="p">(</span><span class="n">a</span> <span class="o">></span> <span class="n">n</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">foo</span><span class="p">();</span>
+<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+ <span class="n">bar</span><span class="p">();</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>gets possibly modified by some optimizations into code similar to this:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">if</span> <span class="p">(</span><span class="n">a</span> <span class="o">></span> <span class="n">n</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">nodupfunc</span><span class="p">();</span>
+ <span class="n">foo</span><span class="p">();</span>
+<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
+ <span class="n">nodupfunc</span><span class="p">();</span>
+ <span class="n">bar</span><span class="p">();</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>where the call to “nodupfunc” is duplicated and sunk into the two branches
+of the condition.</p>
+</div>
+<div class="section" id="no-sanitize-clang-no-sanitize">
+<h3><a class="toc-backref" href="#id23">no_sanitize (clang::no_sanitize)</a><a class="headerlink" href="#no-sanitize-clang-no-sanitize" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Use the <tt class="docutils literal"><span class="pre">no_sanitize</span></tt> attribute on a function declaration to specify
+that a particular instrumentation or set of instrumentations should not be
+applied to that function. The attribute takes a list of string literals,
+which have the same meaning as values accepted by the <tt class="docutils literal"><span class="pre">-fno-sanitize=</span></tt>
+flag. For example, <tt class="docutils literal"><span class="pre">__attribute__((no_sanitize("address",</span> <span class="pre">"thread")))</span></tt>
+specifies that AddressSanitizer and ThreadSanitizer should not be applied
+to the function.</p>
+<p>See <a class="reference internal" href="UsersManual.html#controlling-code-generation"><em>Controlling Code Generation</em></a> for a
+full list of supported sanitizer flags.</p>
+</div>
+<div class="section" id="no-sanitize-address-no-address-safety-analysis-gnu-no-address-safety-analysis-gnu-no-sanitize-address">
+<h3><a class="toc-backref" href="#id24">no_sanitize_address (no_address_safety_analysis, gnu::no_address_safety_analysis, gnu::no_sanitize_address)</a><a class="headerlink" href="#no-sanitize-address-no-address-safety-analysis-gnu-no-address-safety-analysis-gnu-no-sanitize-address" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p id="langext-address-sanitizer">Use <tt class="docutils literal"><span class="pre">__attribute__((no_sanitize_address))</span></tt> on a function declaration to
+specify that address safety instrumentation (e.g. AddressSanitizer) should
+not be applied to that function.</p>
+</div>
+<div class="section" id="no-sanitize-thread">
+<h3><a class="toc-backref" href="#id25">no_sanitize_thread</a><a class="headerlink" href="#no-sanitize-thread" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p id="langext-thread-sanitizer">Use <tt class="docutils literal"><span class="pre">__attribute__((no_sanitize_thread))</span></tt> on a function declaration to
+specify that checks for data races on plain (non-atomic) memory accesses should
+not be inserted by ThreadSanitizer. The function is still instrumented by the
+tool to avoid false positives and provide meaningful stack traces.</p>
+</div>
+<div class="section" id="no-sanitize-memory">
+<h3><a class="toc-backref" href="#id26">no_sanitize_memory</a><a class="headerlink" href="#no-sanitize-memory" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p id="langext-memory-sanitizer">Use <tt class="docutils literal"><span class="pre">__attribute__((no_sanitize_memory))</span></tt> on a function declaration to
+specify that checks for uninitialized memory should not be inserted
+(e.g. by MemorySanitizer). The function may still be instrumented by the tool
+to avoid false positives in other places.</p>
+</div>
+<div class="section" id="no-split-stack-gnu-no-split-stack">
+<h3><a class="toc-backref" href="#id27">no_split_stack (gnu::no_split_stack)</a><a class="headerlink" href="#no-split-stack-gnu-no-split-stack" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">no_split_stack</span></tt> attribute disables the emission of the split stack
+preamble for a particular function. It has no effect if <tt class="docutils literal"><span class="pre">-fsplit-stack</span></tt>
+is not specified.</p>
+</div>
+<div class="section" id="not-tail-called-clang-not-tail-called">
+<h3><a class="toc-backref" href="#id28">not_tail_called (clang::not_tail_called)</a><a class="headerlink" href="#not-tail-called-clang-not-tail-called" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">not_tail_called</span></tt> attribute prevents tail-call optimization on statically bound calls. It has no effect on indirect calls. Virtual functions, objective-c methods, and functions marked as <tt class="docutils literal"><span class="pre">always_inline</span></tt> cannot be marked as <tt class="docutils literal"><span class="pre">not_tail_called</span></tt>.</p>
+<p>For example, it prevents tail-call optimization in the following case:</p>
+<blockquote>
+<div></div></blockquote>
+<p>However, it doesn’t prevent tail-call optimization in this case:</p>
+<blockquote>
+<div></div></blockquote>
+<p>Marking virtual functions as <tt class="docutils literal"><span class="pre">not_tail_called</span></tt> is an error:</p>
+<blockquote>
+<div></div></blockquote>
+</div>
+<div class="section" id="objc-boxable">
+<h3><a class="toc-backref" href="#id29">objc_boxable</a><a class="headerlink" href="#objc-boxable" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Structs and unions marked with the <tt class="docutils literal"><span class="pre">objc_boxable</span></tt> attribute can be used
+with the Objective-C boxed expression syntax, <tt class="docutils literal"><span class="pre">@(...)</span></tt>.</p>
+<p><strong>Usage</strong>: <tt class="docutils literal"><span class="pre">__attribute__((objc_boxable))</span></tt>. This attribute
+can only be placed on a declaration of a trivially-copyable struct or union:</p>
+<div class="highlight-objc"><div class="highlight"><pre>struct __attribute__((objc_boxable)) some_struct {
+ int i;
+};
+union __attribute__((objc_boxable)) some_union {
+ int i;
+ float f;
+};
+typedef struct __attribute__((objc_boxable)) _some_struct some_struct;
+
+// ...
+
+some_struct ss;
+NSValue *boxed = @(ss);
+</pre></div>
+</div>
+</div>
+<div class="section" id="objc-method-family">
+<h3><a class="toc-backref" href="#id30">objc_method_family</a><a class="headerlink" href="#objc-method-family" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Many methods in Objective-C have conventional meanings determined by their
+selectors. It is sometimes useful to be able to mark a method as having a
+particular conventional meaning despite not having the right selector, or as
+not having the conventional meaning that its selector would suggest. For these
+use cases, we provide an attribute to specifically describe the “method family”
+that a method belongs to.</p>
+<p><strong>Usage</strong>: <tt class="docutils literal"><span class="pre">__attribute__((objc_method_family(X)))</span></tt>, where <tt class="docutils literal"><span class="pre">X</span></tt> is one of
+<tt class="docutils literal"><span class="pre">none</span></tt>, <tt class="docutils literal"><span class="pre">alloc</span></tt>, <tt class="docutils literal"><span class="pre">copy</span></tt>, <tt class="docutils literal"><span class="pre">init</span></tt>, <tt class="docutils literal"><span class="pre">mutableCopy</span></tt>, or <tt class="docutils literal"><span class="pre">new</span></tt>. This
+attribute can only be placed at the end of a method declaration:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="k">-</span> <span class="p">(</span><span class="n">NSString</span> <span class="o">*</span><span class="p">)</span><span class="nf">initMyStringValue</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">objc_method_family</span><span class="p">(</span><span class="n">none</span><span class="p">)));</span>
+</pre></div>
+</div>
+<p>Users who do not wish to change the conventional meaning of a method, and who
+merely want to document its non-standard retain and release semantics, should
+use the retaining behavior attributes (<tt class="docutils literal"><span class="pre">ns_returns_retained</span></tt>,
+<tt class="docutils literal"><span class="pre">ns_returns_not_retained</span></tt>, etc).</p>
+<p>Query for this feature with <tt class="docutils literal"><span class="pre">__has_attribute(objc_method_family)</span></tt>.</p>
+</div>
+<div class="section" id="objc-requires-super">
+<h3><a class="toc-backref" href="#id31">objc_requires_super</a><a class="headerlink" href="#objc-requires-super" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Some Objective-C classes allow a subclass to override a particular method in a
+parent class but expect that the overriding method also calls the overridden
+method in the parent class. For these cases, we provide an attribute to
+designate that a method requires a “call to <tt class="docutils literal"><span class="pre">super</span></tt>” in the overriding
+method in the subclass.</p>
+<p><strong>Usage</strong>: <tt class="docutils literal"><span class="pre">__attribute__((objc_requires_super))</span></tt>. This attribute can only
+be placed at the end of a method declaration:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="nf">foo</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">objc_requires_super</span><span class="p">));</span>
+</pre></div>
+</div>
+<p>This attribute can only be applied the method declarations within a class, and
+not a protocol. Currently this attribute does not enforce any placement of
+where the call occurs in the overriding method (such as in the case of
+<tt class="docutils literal"><span class="pre">-dealloc</span></tt> where the call must appear at the end). It checks only that it
+exists.</p>
+<p>Note that on both OS X and iOS that the Foundation framework provides a
+convenience macro <tt class="docutils literal"><span class="pre">NS_REQUIRES_SUPER</span></tt> that provides syntactic sugar for this
+attribute:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="nf">foo</span> <span class="n">NS_REQUIRES_SUPER</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>This macro is conditionally defined depending on the compiler’s support for
+this attribute. If the compiler does not support the attribute the macro
+expands to nothing.</p>
+<p>Operationally, when a method has this annotation the compiler will warn if the
+implementation of an override in a subclass does not call super. For example:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="nl">warning:</span> <span class="n">method</span> <span class="n">possibly</span> <span class="n">missing</span> <span class="n">a</span> <span class="p">[</span><span class="n">super</span> <span class="n">AnnotMeth</span><span class="p">]</span> <span class="n">call</span>
+<span class="o">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">AnnotMeth</span><span class="p">{};</span>
+ <span class="o">^</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="objc-runtime-name">
+<h3><a class="toc-backref" href="#id32">objc_runtime_name</a><a class="headerlink" href="#objc-runtime-name" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>By default, the Objective-C interface or protocol identifier is used
+in the metadata name for that object. The <cite>objc_runtime_name</cite>
+attribute allows annotated interfaces or protocols to use the
+specified string argument in the object’s metadata name instead of the
+default name.</p>
+<p><strong>Usage</strong>: <tt class="docutils literal"><span class="pre">__attribute__((objc_runtime_name("MyLocalName")))</span></tt>. This attribute
+can only be placed before an @protocol or @interface declaration:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="n">__attribute__</span><span class="p">((</span><span class="n">objc_runtime_name</span><span class="p">(</span><span class="s">"MyLocalName"</span><span class="p">)))</span>
+<span class="k">@interface</span> <span class="nc">Message</span>
+<span class="k">@end</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="optnone-clang-optnone">
+<h3><a class="toc-backref" href="#id33">optnone (clang::optnone)</a><a class="headerlink" href="#optnone-clang-optnone" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">optnone</span></tt> attribute suppresses essentially all optimizations
+on a function or method, regardless of the optimization level applied to
+the compilation unit as a whole. This is particularly useful when you
+need to debug a particular function, but it is infeasible to build the
+entire application without optimization. Avoiding optimization on the
+specified function can improve the quality of the debugging information
+for that function.</p>
+<p>This attribute is incompatible with the <tt class="docutils literal"><span class="pre">always_inline</span></tt> and <tt class="docutils literal"><span class="pre">minsize</span></tt>
+attributes.</p>
+</div>
+<div class="section" id="overloadable">
+<h3><a class="toc-backref" href="#id34">overloadable</a><a class="headerlink" href="#overloadable" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang provides support for C++ function overloading in C. Function overloading
+in C is introduced using the <tt class="docutils literal"><span class="pre">overloadable</span></tt> attribute. For example, one
+might provide several overloaded versions of a <tt class="docutils literal"><span class="pre">tgsin</span></tt> function that invokes
+the appropriate standard function computing the sine of a value with <tt class="docutils literal"><span class="pre">float</span></tt>,
+<tt class="docutils literal"><span class="pre">double</span></tt>, or <tt class="docutils literal"><span class="pre">long</span> <span class="pre">double</span></tt> precision:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="cp">#include <math.h></span>
+<span class="kt">float</span> <span class="nf">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">))</span> <span class="n">tgsin</span><span class="p">(</span><span class="kt">float</span> <span class="n">x</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">sinf</span><span class="p">(</span><span class="n">x</span><span class="p">);</span> <span class="p">}</span>
+<span class="kt">double</span> <span class="nf">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">))</span> <span class="n">tgsin</span><span class="p">(</span><span class="kt">double</span> <span class="n">x</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">sin</span><span class="p">(</span><span class="n">x</span><span class="p">);</span> <span class="p">}</span>
+<span class="kt">long</span> <span class="kt">double</span> <span class="nf">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">))</span> <span class="n">tgsin</span><span class="p">(</span><span class="kt">long</span> <span class="kt">double</span> <span class="n">x</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">sinl</span><span class="p">(</span><span class="n">x</span><span class="p">);</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>Given these declarations, one can call <tt class="docutils literal"><span class="pre">tgsin</span></tt> with a <tt class="docutils literal"><span class="pre">float</span></tt> value to
+receive a <tt class="docutils literal"><span class="pre">float</span></tt> result, with a <tt class="docutils literal"><span class="pre">double</span></tt> to receive a <tt class="docutils literal"><span class="pre">double</span></tt> result,
+etc. Function overloading in C follows the rules of C++ function overloading
+to pick the best overload given the call arguments, with a few C-specific
+semantics:</p>
+<ul class="simple">
+<li>Conversion from <tt class="docutils literal"><span class="pre">float</span></tt> or <tt class="docutils literal"><span class="pre">double</span></tt> to <tt class="docutils literal"><span class="pre">long</span> <span class="pre">double</span></tt> is ranked as a
+floating-point promotion (per C99) rather than as a floating-point conversion
+(as in C++).</li>
+<li>A conversion from a pointer of type <tt class="docutils literal"><span class="pre">T*</span></tt> to a pointer of type <tt class="docutils literal"><span class="pre">U*</span></tt> is
+considered a pointer conversion (with conversion rank) if <tt class="docutils literal"><span class="pre">T</span></tt> and <tt class="docutils literal"><span class="pre">U</span></tt> are
+compatible types.</li>
+<li>A conversion from type <tt class="docutils literal"><span class="pre">T</span></tt> to a value of type <tt class="docutils literal"><span class="pre">U</span></tt> is permitted if <tt class="docutils literal"><span class="pre">T</span></tt>
+and <tt class="docutils literal"><span class="pre">U</span></tt> are compatible types. This conversion is given “conversion” rank.</li>
+</ul>
+<p>The declaration of <tt class="docutils literal"><span class="pre">overloadable</span></tt> functions is restricted to function
+declarations and definitions. Most importantly, if any function with a given
+name is given the <tt class="docutils literal"><span class="pre">overloadable</span></tt> attribute, then all function declarations
+and definitions with that name (and in that scope) must have the
+<tt class="docutils literal"><span class="pre">overloadable</span></tt> attribute. This rule even applies to redeclarations of
+functions whose original declaration had the <tt class="docutils literal"><span class="pre">overloadable</span></tt> attribute, e.g.,</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">f</span><span class="p">(</span><span class="kt">int</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">));</span>
+<span class="kt">float</span> <span class="nf">f</span><span class="p">(</span><span class="kt">float</span><span class="p">);</span> <span class="c1">// error: declaration of "f" must have the "overloadable" attribute</span>
+
+<span class="kt">int</span> <span class="nf">g</span><span class="p">(</span><span class="kt">int</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">));</span>
+<span class="kt">int</span> <span class="nf">g</span><span class="p">(</span><span class="kt">int</span><span class="p">)</span> <span class="p">{</span> <span class="p">}</span> <span class="c1">// error: redeclaration of "g" must also have the "overloadable" attribute</span>
+</pre></div>
+</div>
+<p>Functions marked <tt class="docutils literal"><span class="pre">overloadable</span></tt> must have prototypes. Therefore, the
+following code is ill-formed:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">h</span><span class="p">()</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">));</span> <span class="c1">// error: h does not have a prototype</span>
+</pre></div>
+</div>
+<p>However, <tt class="docutils literal"><span class="pre">overloadable</span></tt> functions are allowed to use a ellipsis even if there
+are no named parameters (as is permitted in C++). This feature is particularly
+useful when combined with the <tt class="docutils literal"><span class="pre">unavailable</span></tt> attribute:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">honeypot</span><span class="p">(...)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">overloadable</span><span class="p">,</span> <span class="n">unavailable</span><span class="p">));</span> <span class="c1">// calling me is an error</span>
+</pre></div>
+</div>
+<p>Functions declared with the <tt class="docutils literal"><span class="pre">overloadable</span></tt> attribute have their names mangled
+according to the same rules as C++ function names. For example, the three
+<tt class="docutils literal"><span class="pre">tgsin</span></tt> functions in our motivating example get the mangled names
+<tt class="docutils literal"><span class="pre">_Z5tgsinf</span></tt>, <tt class="docutils literal"><span class="pre">_Z5tgsind</span></tt>, and <tt class="docutils literal"><span class="pre">_Z5tgsine</span></tt>, respectively. There are two
+caveats to this use of name mangling:</p>
+<ul class="simple">
+<li>Future versions of Clang may change the name mangling of functions overloaded
+in C, so you should not depend on an specific mangling. To be completely
+safe, we strongly urge the use of <tt class="docutils literal"><span class="pre">static</span> <span class="pre">inline</span></tt> with <tt class="docutils literal"><span class="pre">overloadable</span></tt>
+functions.</li>
+<li>The <tt class="docutils literal"><span class="pre">overloadable</span></tt> attribute has almost no meaning when used in C++,
+because names will already be mangled and functions are already overloadable.
+However, when an <tt class="docutils literal"><span class="pre">overloadable</span></tt> function occurs within an <tt class="docutils literal"><span class="pre">extern</span> <span class="pre">"C"</span></tt>
+linkage specification, it’s name <em>will</em> be mangled in the same way as it
+would in C.</li>
+</ul>
+<p>Query for this feature with <tt class="docutils literal"><span class="pre">__has_extension(attribute_overloadable)</span></tt>.</p>
+</div>
+<div class="section" id="release-capability-release-shared-capability-clang-release-capability-clang-release-shared-capability">
+<h3><a class="toc-backref" href="#id35">release_capability (release_shared_capability, clang::release_capability, clang::release_shared_capability)</a><a class="headerlink" href="#release-capability-release-shared-capability-clang-release-capability-clang-release-shared-capability" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Marks a function as releasing a capability.</p>
+</div>
+<div class="section" id="target-gnu-target">
+<h3><a class="toc-backref" href="#id36">target (gnu::target)</a><a class="headerlink" href="#target-gnu-target" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang supports the GNU style <tt class="docutils literal"><span class="pre">__attribute__((target("OPTIONS")))</span></tt> attribute.
+This attribute may be attached to a function definition and instructs
+the backend to use different code generation options than were passed on the
+command line.</p>
+<p>The current set of options correspond to the existing “subtarget features” for
+the target with or without a “-mno-” in front corresponding to the absence
+of the feature, as well as <tt class="docutils literal"><span class="pre">arch="CPU"</span></tt> which will change the default “CPU”
+for the function.</p>
+<p>Example “subtarget features” from the x86 backend include: “mmx”, “sse”, “sse4.2”,
+“avx”, “xop” and largely correspond to the machine specific options handled by
+the front end.</p>
+</div>
+<div class="section" id="try-acquire-capability-try-acquire-shared-capability-clang-try-acquire-capability-clang-try-acquire-shared-capability">
+<h3><a class="toc-backref" href="#id37">try_acquire_capability (try_acquire_shared_capability, clang::try_acquire_capability, clang::try_acquire_shared_capability)</a><a class="headerlink" href="#try-acquire-capability-try-acquire-shared-capability-clang-try-acquire-capability-clang-try-acquire-shared-capability" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Marks a function that attempts to acquire a capability. This function may fail to
+actually acquire the capability; they accept a Boolean value determining
+whether acquiring the capability means success (true), or failing to acquire
+the capability means success (false).</p>
+</div>
+</div>
+<div class="section" id="variable-attributes">
+<h2><a class="toc-backref" href="#id38">Variable Attributes</a><a class="headerlink" href="#variable-attributes" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="init-seg">
+<h3><a class="toc-backref" href="#id39">init_seg</a><a class="headerlink" href="#init-seg" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+</tr>
+</tbody>
+</table>
+<p>The attribute applied by <tt class="docutils literal"><span class="pre">pragma</span> <span class="pre">init_seg()</span></tt> controls the section into
+which global initialization function pointers are emitted. It is only
+available with <tt class="docutils literal"><span class="pre">-fms-extensions</span></tt>. Typically, this function pointer is
+emitted into <tt class="docutils literal"><span class="pre">.CRT$XCU</span></tt> on Windows. The user can change the order of
+initialization by using a different section name with the same
+<tt class="docutils literal"><span class="pre">.CRT$XC</span></tt> prefix and a suffix that sorts lexicographically before or
+after the standard <tt class="docutils literal"><span class="pre">.CRT$XCU</span></tt> sections. See the <a class="reference external" href="http://msdn.microsoft.com/en-us/library/7977wcck(v=vs.110).aspx">init_seg</a>
+documentation on MSDN for more information.</p>
+</div>
+<div class="section" id="pass-object-size">
+<h3><a class="toc-backref" href="#id40">pass_object_size</a><a class="headerlink" href="#pass-object-size" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">The mangling of functions with parameters that are annotated with
+<tt class="docutils literal"><span class="pre">pass_object_size</span></tt> is subject to change. You can get around this by
+using <tt class="docutils literal"><span class="pre">__asm__("foo")</span></tt> to explicitly name your functions, thus preserving
+your ABI; also, non-overloadable C functions with <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> are
+not mangled.</p>
+</div>
+<p>The <tt class="docutils literal"><span class="pre">pass_object_size(Type)</span></tt> attribute can be placed on function parameters to
+instruct clang to call <tt class="docutils literal"><span class="pre">__builtin_object_size(param,</span> <span class="pre">Type)</span></tt> at each callsite
+of said function, and implicitly pass the result of this call in as an invisible
+argument of type <tt class="docutils literal"><span class="pre">size_t</span></tt> directly after the parameter annotated with
+<tt class="docutils literal"><span class="pre">pass_object_size</span></tt>. Clang will also replace any calls to
+<tt class="docutils literal"><span class="pre">__builtin_object_size(param,</span> <span class="pre">Type)</span></tt> in the function by said implicit
+parameter.</p>
+<p>Example usage:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">bzero1</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="k">const</span> <span class="n">p</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">pass_object_size</span><span class="p">(</span><span class="mi">0</span><span class="p">))))</span>
+ <span class="n">__attribute__</span><span class="p">((</span><span class="n">noinline</span><span class="p">))</span> <span class="p">{</span>
+ <span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
+ <span class="k">for</span> <span class="p">(</span><span class="cm">/**/</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="p">(</span><span class="kt">int</span><span class="p">)</span><span class="n">__builtin_object_size</span><span class="p">(</span><span class="n">p</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span> <span class="o">++</span><span class="n">i</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">p</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
+ <span class="p">}</span>
+ <span class="k">return</span> <span class="n">i</span><span class="p">;</span>
+<span class="p">}</span>
+
+<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
+ <span class="kt">char</span> <span class="n">chars</span><span class="p">[</span><span class="mi">100</span><span class="p">];</span>
+ <span class="kt">int</span> <span class="n">n</span> <span class="o">=</span> <span class="n">bzero1</span><span class="p">(</span><span class="o">&</span><span class="n">chars</span><span class="p">[</span><span class="mi">0</span><span class="p">]);</span>
+ <span class="n">assert</span><span class="p">(</span><span class="n">n</span> <span class="o">==</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">chars</span><span class="p">));</span>
+ <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>If successfully evaluating <tt class="docutils literal"><span class="pre">__builtin_object_size(param,</span> <span class="pre">Type)</span></tt> at the
+callsite is not possible, then the “failed” value is passed in. So, using the
+definition of <tt class="docutils literal"><span class="pre">bzero1</span></tt> from above, the following code would exit cleanly:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">main2</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">argv</span><span class="p">[])</span> <span class="p">{</span>
+ <span class="kt">int</span> <span class="n">n</span> <span class="o">=</span> <span class="n">bzero1</span><span class="p">(</span><span class="n">argv</span><span class="p">);</span>
+ <span class="n">assert</span><span class="p">(</span><span class="n">n</span> <span class="o">==</span> <span class="o">-</span><span class="mi">1</span><span class="p">);</span>
+ <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p><tt class="docutils literal"><span class="pre">pass_object_size</span></tt> plays a part in overload resolution. If two overload
+candidates are otherwise equally good, then the overload with one or more
+parameters with <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> is preferred. This implies that the choice
+between two identical overloads both with <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> on one or more
+parameters will always be ambiguous; for this reason, having two such overloads
+is illegal. For example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#define PS(N) __attribute__((pass_object_size(N)))</span>
+<span class="c1">// OK</span>
+<span class="kt">void</span> <span class="nf">Foo</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">a</span><span class="p">,</span> <span class="kt">char</span> <span class="o">*</span><span class="n">b</span><span class="p">);</span> <span class="c1">// Overload A</span>
+<span class="c1">// OK -- overload A has no parameters with pass_object_size.</span>
+<span class="kt">void</span> <span class="nf">Foo</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">a</span> <span class="n">PS</span><span class="p">(</span><span class="mi">0</span><span class="p">),</span> <span class="kt">char</span> <span class="o">*</span><span class="n">b</span> <span class="n">PS</span><span class="p">(</span><span class="mi">0</span><span class="p">));</span> <span class="c1">// Overload B</span>
+<span class="c1">// Error -- Same signature (sans pass_object_size) as overload B, and both</span>
+<span class="c1">// overloads have one or more parameters with the pass_object_size attribute.</span>
+<span class="kt">void</span> <span class="nf">Foo</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">a</span> <span class="n">PS</span><span class="p">(</span><span class="mi">0</span><span class="p">),</span> <span class="kt">void</span> <span class="o">*</span><span class="n">b</span><span class="p">);</span>
+
+<span class="c1">// OK</span>
+<span class="kt">void</span> <span class="nf">Bar</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">a</span> <span class="n">PS</span><span class="p">(</span><span class="mi">0</span><span class="p">));</span> <span class="c1">// Overload C</span>
+<span class="c1">// OK</span>
+<span class="kt">void</span> <span class="nf">Bar</span><span class="p">(</span><span class="kt">char</span> <span class="o">*</span><span class="n">c</span> <span class="n">PS</span><span class="p">(</span><span class="mi">1</span><span class="p">));</span> <span class="c1">// Overload D</span>
+
+<span class="kt">void</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
+ <span class="kt">char</span> <span class="n">known</span><span class="p">[</span><span class="mi">10</span><span class="p">],</span> <span class="o">*</span><span class="n">unknown</span><span class="p">;</span>
+ <span class="n">Foo</span><span class="p">(</span><span class="n">unknown</span><span class="p">,</span> <span class="n">unknown</span><span class="p">);</span> <span class="c1">// Calls overload B</span>
+ <span class="n">Foo</span><span class="p">(</span><span class="n">known</span><span class="p">,</span> <span class="n">unknown</span><span class="p">);</span> <span class="c1">// Calls overload B</span>
+ <span class="n">Foo</span><span class="p">(</span><span class="n">unknown</span><span class="p">,</span> <span class="n">known</span><span class="p">);</span> <span class="c1">// Calls overload B</span>
+ <span class="n">Foo</span><span class="p">(</span><span class="n">known</span><span class="p">,</span> <span class="n">known</span><span class="p">);</span> <span class="c1">// Calls overload B</span>
+
+ <span class="n">Bar</span><span class="p">(</span><span class="n">known</span><span class="p">);</span> <span class="c1">// Calls overload D</span>
+ <span class="n">Bar</span><span class="p">(</span><span class="n">unknown</span><span class="p">);</span> <span class="c1">// Calls overload D</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Currently, <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> is a bit restricted in terms of its usage:</p>
+<ul class="simple">
+<li>Only one use of <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> is allowed per parameter.</li>
+<li>It is an error to take the address of a function with <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> on
+any of its parameters. If you wish to do this, you can create an overload
+without <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> on any parameters.</li>
+<li>It is an error to apply the <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> attribute to parameters that
+are not pointers. Additionally, any parameter that <tt class="docutils literal"><span class="pre">pass_object_size</span></tt> is
+applied to must be marked <tt class="docutils literal"><span class="pre">const</span></tt> at its function’s definition.</li>
+</ul>
+</div>
+<div class="section" id="section-gnu-section-declspec-allocate">
+<h3><a class="toc-backref" href="#id41">section (gnu::section, __declspec(allocate))</a><a class="headerlink" href="#section-gnu-section-declspec-allocate" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">section</span></tt> attribute allows you to specify a specific section a
+global variable or function should be in after translation.</p>
+</div>
+<div class="section" id="tls-model-gnu-tls-model">
+<h3><a class="toc-backref" href="#id42">tls_model (gnu::tls_model)</a><a class="headerlink" href="#tls-model-gnu-tls-model" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">tls_model</span></tt> attribute allows you to specify which thread-local storage
+model to use. It accepts the following strings:</p>
+<ul class="simple">
+<li>global-dynamic</li>
+<li>local-dynamic</li>
+<li>initial-exec</li>
+<li>local-exec</li>
+</ul>
+<p>TLS models are mutually exclusive.</p>
+</div>
+<div class="section" id="thread">
+<h3><a class="toc-backref" href="#id43">thread</a><a class="headerlink" href="#thread" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">__declspec(thread)</span></tt> attribute declares a variable with thread local
+storage. It is available under the <tt class="docutils literal"><span class="pre">-fms-extensions</span></tt> flag for MSVC
+compatibility. See the documentation for <a class="reference external" href="http://msdn.microsoft.com/en-us/library/9w1sdazb.aspx">__declspec(thread)</a> on MSDN.</p>
+<p>In Clang, <tt class="docutils literal"><span class="pre">__declspec(thread)</span></tt> is generally equivalent in functionality to the
+GNU <tt class="docutils literal"><span class="pre">__thread</span></tt> keyword. The variable must not have a destructor and must have
+a constant initializer, if any. The attribute only applies to variables
+declared with static storage duration, such as globals, class static data
+members, and static locals.</p>
+</div>
+</div>
+<div class="section" id="type-attributes">
+<h2><a class="toc-backref" href="#id44">Type Attributes</a><a class="headerlink" href="#type-attributes" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="align-value">
+<h3><a class="toc-backref" href="#id45">align_value</a><a class="headerlink" href="#align-value" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The align_value attribute can be added to the typedef of a pointer type or the
+declaration of a variable of pointer or reference type. It specifies that the
+pointer will point to, or the reference will bind to, only objects with at
+least the provided alignment. This alignment value must be some positive power
+of 2.</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="k">typedef</span> <span class="kt">double</span> <span class="o">*</span> <span class="n">aligned_double_ptr</span> <span class="nf">__attribute__</span><span class="p">((</span><span class="n">align_value</span><span class="p">(</span><span class="mi">64</span><span class="p">)));</span>
+<span class="kt">void</span> <span class="nf">foo</span><span class="p">(</span><span class="kt">double</span> <span class="o">&</span> <span class="n">x</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">align_value</span><span class="p">(</span><span class="mi">128</span><span class="p">)),</span>
+ <span class="n">aligned_double_ptr</span> <span class="n">y</span><span class="p">)</span> <span class="p">{</span> <span class="p">...</span> <span class="p">}</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>If the pointer value does not have the specified alignment at runtime, the
+behavior of the program is undefined.</p>
+</div>
+<div class="section" id="flag-enum">
+<h3><a class="toc-backref" href="#id46">flag_enum</a><a class="headerlink" href="#flag-enum" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>This attribute can be added to an enumerator to signal to the compiler that it
+is intended to be used as a flag type. This will cause the compiler to assume
+that the range of the type includes all of the values that you can get by
+manipulating bits of the enumerator when issuing warnings.</p>
+</div>
+<div class="section" id="single-inhertiance-multiple-inheritance-virtual-inheritance">
+<h3><a class="toc-backref" href="#id47">__single_inhertiance, __multiple_inheritance, __virtual_inheritance</a><a class="headerlink" href="#single-inhertiance-multiple-inheritance-virtual-inheritance" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>This collection of keywords is enabled under <tt class="docutils literal"><span class="pre">-fms-extensions</span></tt> and controls
+the pointer-to-member representation used on <tt class="docutils literal"><span class="pre">*-*-win32</span></tt> targets.</p>
+<p>The <tt class="docutils literal"><span class="pre">*-*-win32</span></tt> targets utilize a pointer-to-member representation which
+varies in size and alignment depending on the definition of the underlying
+class.</p>
+<p>However, this is problematic when a forward declaration is only available and
+no definition has been made yet. In such cases, Clang is forced to utilize the
+most general representation that is available to it.</p>
+<p>These keywords make it possible to use a pointer-to-member representation other
+than the most general one regardless of whether or not the definition will ever
+be present in the current translation unit.</p>
+<p>This family of keywords belong between the <tt class="docutils literal"><span class="pre">class-key</span></tt> and <tt class="docutils literal"><span class="pre">class-name</span></tt>:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__single_inheritance</span> <span class="n">S</span><span class="p">;</span>
+<span class="kt">int</span> <span class="n">S</span><span class="o">::*</span><span class="n">i</span><span class="p">;</span>
+<span class="k">struct</span> <span class="n">S</span> <span class="p">{};</span>
+</pre></div>
+</div>
+<p>This keyword can be applied to class templates but only has an effect when used
+on full specializations:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="k">template</span> <span class="o"><</span><span class="k">typename</span> <span class="n">T</span><span class="p">,</span> <span class="k">typename</span> <span class="n">U</span><span class="o">></span> <span class="k">struct</span> <span class="n">__single_inheritance</span> <span class="n">A</span><span class="p">;</span> <span class="c1">// warning: inheritance model ignored on primary template</span>
+<span class="k">template</span> <span class="o"><</span><span class="k">typename</span> <span class="n">T</span><span class="o">></span> <span class="k">struct</span> <span class="n">__multiple_inheritance</span> <span class="n">A</span><span class="o"><</span><span class="n">T</span><span class="p">,</span> <span class="n">T</span><span class="o">></span><span class="p">;</span> <span class="c1">// warning: inheritance model ignored on partial specialization</span>
+<span class="k">template</span> <span class="o"><></span> <span class="k">struct</span> <span class="n">__single_inheritance</span> <span class="n">A</span><span class="o"><</span><span class="kt">int</span><span class="p">,</span> <span class="kt">float</span><span class="o">></span><span class="p">;</span>
+</pre></div>
+</div>
+<p>Note that choosing an inheritance model less general than strictly necessary is
+an error:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__multiple_inheritance</span> <span class="n">S</span><span class="p">;</span> <span class="c1">// error: inheritance model does not match definition</span>
+<span class="kt">int</span> <span class="n">S</span><span class="o">::*</span><span class="n">i</span><span class="p">;</span>
+<span class="k">struct</span> <span class="n">S</span> <span class="p">{};</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="novtable">
+<h3><a class="toc-backref" href="#id48">novtable</a><a class="headerlink" href="#novtable" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>This attribute can be added to a class declaration or definition to signal to
+the compiler that constructors and destructors will not reference the virtual
+function table. It is only supported when using the Microsoft C++ ABI.</p>
+</div>
+</div>
+<div class="section" id="statement-attributes">
+<h2><a class="toc-backref" href="#id49">Statement Attributes</a><a class="headerlink" href="#statement-attributes" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="fallthrough-clang-fallthrough">
+<h3><a class="toc-backref" href="#id50">fallthrough (clang::fallthrough)</a><a class="headerlink" href="#fallthrough-clang-fallthrough" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">clang::fallthrough</span></tt> attribute is used along with the
+<tt class="docutils literal"><span class="pre">-Wimplicit-fallthrough</span></tt> argument to annotate intentional fall-through
+between switch labels. It can only be applied to a null statement placed at a
+point of execution between any statement and the next switch label. It is
+common to mark these places with a specific comment, but this attribute is
+meant to replace comments with a more strict annotation, which can be checked
+by the compiler. This attribute doesn’t change semantics of the code and can
+be used wherever an intended fall-through occurs. It is designed to mimic
+control-flow statements like <tt class="docutils literal"><span class="pre">break;</span></tt>, so it can be placed in most places
+where <tt class="docutils literal"><span class="pre">break;</span></tt> can, but only if there are no statements on the execution path
+between it and the next switch label.</p>
+<p>Here is an example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="c1">// compile with -Wimplicit-fallthrough</span>
+<span class="k">switch</span> <span class="p">(</span><span class="n">n</span><span class="p">)</span> <span class="p">{</span>
+<span class="k">case</span> <span class="mi">22</span>:
+<span class="k">case</span> <span class="mi">33</span>: <span class="c1">// no warning: no statements between case labels</span>
+ <span class="n">f</span><span class="p">();</span>
+<span class="k">case</span> <span class="mi">44</span>: <span class="c1">// warning: unannotated fall-through</span>
+ <span class="n">g</span><span class="p">();</span>
+ <span class="p">[[</span><span class="n">clang</span><span class="o">::</span><span class="n">fallthrough</span><span class="p">]];</span>
+<span class="k">case</span> <span class="mi">55</span>: <span class="c1">// no warning</span>
+ <span class="k">if</span> <span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">h</span><span class="p">();</span>
+ <span class="k">break</span><span class="p">;</span>
+ <span class="p">}</span>
+ <span class="k">else</span> <span class="p">{</span>
+ <span class="n">i</span><span class="p">();</span>
+ <span class="p">[[</span><span class="n">clang</span><span class="o">::</span><span class="n">fallthrough</span><span class="p">]];</span>
+ <span class="p">}</span>
+<span class="k">case</span> <span class="mi">66</span>: <span class="c1">// no warning</span>
+ <span class="n">p</span><span class="p">();</span>
+ <span class="p">[[</span><span class="n">clang</span><span class="o">::</span><span class="n">fallthrough</span><span class="p">]];</span> <span class="c1">// warning: fallthrough annotation does not</span>
+ <span class="c1">// directly precede case label</span>
+ <span class="n">q</span><span class="p">();</span>
+<span class="k">case</span> <span class="mi">77</span>: <span class="c1">// warning: unannotated fall-through</span>
+ <span class="n">r</span><span class="p">();</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="pragma-clang-loop">
+<h3><a class="toc-backref" href="#id51">#pragma clang loop</a><a class="headerlink" href="#pragma-clang-loop" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">clang</span> <span class="pre">loop</span></tt> directive allows loop optimization hints to be
+specified for the subsequent loop. The directive allows vectorization,
+interleaving, and unrolling to be enabled or disabled. Vector width as well
+as interleave and unrolling count can be manually specified. See
+<a class="reference external" href="http://clang.llvm.org/docs/LanguageExtensions.html#extensions-for-loop-hint-optimizations">language extensions</a>
+for details.</p>
+</div>
+<div class="section" id="pragma-unroll-pragma-nounroll">
+<h3><a class="toc-backref" href="#id52">#pragma unroll, #pragma nounroll</a><a class="headerlink" href="#pragma-unroll-pragma-nounroll" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+</tr>
+</tbody>
+</table>
+<p>Loop unrolling optimization hints can be specified with <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">unroll</span></tt> and
+<tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">nounroll</span></tt>. The pragma is placed immediately before a for, while,
+do-while, or c++11 range-based for loop.</p>
+<p>Specifying <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">unroll</span></tt> without a parameter directs the loop unroller to
+attempt to fully unroll the loop if the trip count is known at compile time and
+attempt to partially unroll the loop if the trip count is not known at compile
+time:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#pragma unroll</span>
+<span class="k">for</span> <span class="p">(...)</span> <span class="p">{</span>
+ <span class="p">...</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Specifying the optional parameter, <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">unroll</span> <span class="pre">_value_</span></tt>, directs the
+unroller to unroll the loop <tt class="docutils literal"><span class="pre">_value_</span></tt> times. The parameter may optionally be
+enclosed in parentheses:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#pragma unroll 16</span>
+<span class="k">for</span> <span class="p">(...)</span> <span class="p">{</span>
+ <span class="p">...</span>
+<span class="p">}</span>
+
+<span class="cp">#pragma unroll(16)</span>
+<span class="k">for</span> <span class="p">(...)</span> <span class="p">{</span>
+ <span class="p">...</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Specifying <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">nounroll</span></tt> indicates that the loop should not be unrolled:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#pragma nounroll</span>
+<span class="k">for</span> <span class="p">(...)</span> <span class="p">{</span>
+ <span class="p">...</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p><tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">unroll</span></tt> and <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">unroll</span> <span class="pre">_value_</span></tt> have identical semantics to
+<tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">clang</span> <span class="pre">loop</span> <span class="pre">unroll(full)</span></tt> and
+<tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">clang</span> <span class="pre">loop</span> <span class="pre">unroll_count(_value_)</span></tt> respectively. <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">nounroll</span></tt>
+is equivalent to <tt class="docutils literal"><span class="pre">#pragma</span> <span class="pre">clang</span> <span class="pre">loop</span> <span class="pre">unroll(disable)</span></tt>. See
+<a class="reference external" href="http://clang.llvm.org/docs/LanguageExtensions.html#extensions-for-loop-hint-optimizations">language extensions</a>
+for further details including limitations of the unroll hints.</p>
+</div>
+</div>
+<div class="section" id="type-safety-checking">
+<h2><a class="toc-backref" href="#id53">Type Safety Checking</a><a class="headerlink" href="#type-safety-checking" title="Permalink to this headline">¶</a></h2>
+<p>Clang supports additional attributes to enable checking type safety properties
+that can’t be enforced by the C type system. Use cases include:</p>
+<ul class="simple">
+<li>MPI library implementations, where these attributes enable checking that
+the buffer type matches the passed <tt class="docutils literal"><span class="pre">MPI_Datatype</span></tt>;</li>
+<li>for HDF5 library there is a similar use case to MPI;</li>
+<li>checking types of variadic functions’ arguments for functions like
+<tt class="docutils literal"><span class="pre">fcntl()</span></tt> and <tt class="docutils literal"><span class="pre">ioctl()</span></tt>.</li>
+</ul>
+<p>You can detect support for these attributes with <tt class="docutils literal"><span class="pre">__has_attribute()</span></tt>. For
+example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#if defined(__has_attribute)</span>
+<span class="cp"># if __has_attribute(argument_with_type_tag) && \</span>
+<span class="cp"> __has_attribute(pointer_with_type_tag) && \</span>
+<span class="cp"> __has_attribute(type_tag_for_datatype)</span>
+<span class="cp"># define ATTR_MPI_PWT(buffer_idx, type_idx) __attribute__((pointer_with_type_tag(mpi,buffer_idx,type_idx)))</span>
+<span class="cm">/* ... other macros ... */</span>
+<span class="cp"># endif</span>
+<span class="cp">#endif</span>
+
+<span class="cp">#if !defined(ATTR_MPI_PWT)</span>
+<span class="cp"># define ATTR_MPI_PWT(buffer_idx, type_idx)</span>
+<span class="cp">#endif</span>
+
+<span class="kt">int</span> <span class="nf">MPI_Send</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span> <span class="kt">int</span> <span class="n">count</span><span class="p">,</span> <span class="n">MPI_Datatype</span> <span class="n">datatype</span> <span class="cm">/*, other args omitted */</span><span class="p">)</span>
+ <span class="n">ATTR_MPI_PWT</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="mi">3</span><span class="p">);</span>
+</pre></div>
+</div>
+<div class="section" id="argument-with-type-tag">
+<h3><a class="toc-backref" href="#id54">argument_with_type_tag</a><a class="headerlink" href="#argument-with-type-tag" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Use <tt class="docutils literal"><span class="pre">__attribute__((argument_with_type_tag(arg_kind,</span> <span class="pre">arg_idx,</span>
+<span class="pre">type_tag_idx)))</span></tt> on a function declaration to specify that the function
+accepts a type tag that determines the type of some other argument.
+<tt class="docutils literal"><span class="pre">arg_kind</span></tt> is an identifier that should be used when annotating all
+applicable type tags.</p>
+<p>This attribute is primarily useful for checking arguments of variadic functions
+(<tt class="docutils literal"><span class="pre">pointer_with_type_tag</span></tt> can be used in most non-variadic cases).</p>
+<p>For example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">fcntl</span><span class="p">(</span><span class="kt">int</span> <span class="n">fd</span><span class="p">,</span> <span class="kt">int</span> <span class="n">cmd</span><span class="p">,</span> <span class="p">...)</span>
+ <span class="n">__attribute__</span><span class="p">((</span> <span class="n">argument_with_type_tag</span><span class="p">(</span><span class="n">fcntl</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span> <span class="p">));</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="pointer-with-type-tag">
+<h3><a class="toc-backref" href="#id55">pointer_with_type_tag</a><a class="headerlink" href="#pointer-with-type-tag" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Use <tt class="docutils literal"><span class="pre">__attribute__((pointer_with_type_tag(ptr_kind,</span> <span class="pre">ptr_idx,</span> <span class="pre">type_tag_idx)))</span></tt>
+on a function declaration to specify that the function accepts a type tag that
+determines the pointee type of some other pointer argument.</p>
+<p>For example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">MPI_Send</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">buf</span><span class="p">,</span> <span class="kt">int</span> <span class="n">count</span><span class="p">,</span> <span class="n">MPI_Datatype</span> <span class="n">datatype</span> <span class="cm">/*, other args omitted */</span><span class="p">)</span>
+ <span class="n">__attribute__</span><span class="p">((</span> <span class="n">pointer_with_type_tag</span><span class="p">(</span><span class="n">mpi</span><span class="p">,</span><span class="mi">1</span><span class="p">,</span><span class="mi">3</span><span class="p">)</span> <span class="p">));</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="type-tag-for-datatype">
+<h3><a class="toc-backref" href="#id56">type_tag_for_datatype</a><a class="headerlink" href="#type-tag-for-datatype" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang supports annotating type tags of two forms.</p>
+<ul>
+<li><p class="first"><strong>Type tag that is an expression containing a reference to some declared
+identifier.</strong> Use <tt class="docutils literal"><span class="pre">__attribute__((type_tag_for_datatype(kind,</span> <span class="pre">type)))</span></tt> on a
+declaration with that identifier:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="k">extern</span> <span class="k">struct</span> <span class="n">mpi_datatype</span> <span class="n">mpi_datatype_int</span>
+ <span class="nf">__attribute__</span><span class="p">((</span> <span class="n">type_tag_for_datatype</span><span class="p">(</span><span class="n">mpi</span><span class="p">,</span><span class="kt">int</span><span class="p">)</span> <span class="p">));</span>
+<span class="cp">#define MPI_INT ((MPI_Datatype) &mpi_datatype_int)</span>
+</pre></div>
+</div>
+</li>
+<li><p class="first"><strong>Type tag that is an integral literal.</strong> Introduce a <tt class="docutils literal"><span class="pre">static</span> <span class="pre">const</span></tt>
+variable with a corresponding initializer value and attach
+<tt class="docutils literal"><span class="pre">__attribute__((type_tag_for_datatype(kind,</span> <span class="pre">type)))</span></tt> on that declaration,
+for example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cp">#define MPI_INT ((MPI_Datatype) 42)</span>
+<span class="k">static</span> <span class="k">const</span> <span class="n">MPI_Datatype</span> <span class="n">mpi_datatype_int</span>
+ <span class="n">__attribute__</span><span class="p">((</span> <span class="n">type_tag_for_datatype</span><span class="p">(</span><span class="n">mpi</span><span class="p">,</span><span class="kt">int</span><span class="p">)</span> <span class="p">))</span> <span class="o">=</span> <span class="mi">42</span>
+</pre></div>
+</div>
+</li>
+</ul>
+<p>The attribute also accepts an optional third argument that determines how the
+expression is compared to the type tag. There are two supported flags:</p>
+<ul>
+<li><p class="first"><tt class="docutils literal"><span class="pre">layout_compatible</span></tt> will cause types to be compared according to
+layout-compatibility rules (C++11 [class.mem] p 17, 18). This is
+implemented to support annotating types like <tt class="docutils literal"><span class="pre">MPI_DOUBLE_INT</span></tt>.</p>
+<p>For example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cm">/* In mpi.h */</span>
+<span class="k">struct</span> <span class="n">internal_mpi_double_int</span> <span class="p">{</span> <span class="kt">double</span> <span class="n">d</span><span class="p">;</span> <span class="kt">int</span> <span class="n">i</span><span class="p">;</span> <span class="p">};</span>
+<span class="k">extern</span> <span class="k">struct</span> <span class="n">mpi_datatype</span> <span class="n">mpi_datatype_double_int</span>
+ <span class="nf">__attribute__</span><span class="p">((</span> <span class="n">type_tag_for_datatype</span><span class="p">(</span><span class="n">mpi</span><span class="p">,</span> <span class="k">struct</span> <span class="n">internal_mpi_double_int</span><span class="p">,</span> <span class="n">layout_compatible</span><span class="p">)</span> <span class="p">));</span>
+
+<span class="cp">#define MPI_DOUBLE_INT ((MPI_Datatype) &mpi_datatype_double_int)</span>
+
+<span class="cm">/* In user code */</span>
+<span class="k">struct</span> <span class="n">my_pair</span> <span class="p">{</span> <span class="kt">double</span> <span class="n">a</span><span class="p">;</span> <span class="kt">int</span> <span class="n">b</span><span class="p">;</span> <span class="p">};</span>
+<span class="k">struct</span> <span class="n">my_pair</span> <span class="o">*</span><span class="n">buffer</span><span class="p">;</span>
+<span class="n">MPI_Send</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">MPI_DOUBLE_INT</span> <span class="cm">/*, ... */</span><span class="p">);</span> <span class="c1">// no warning</span>
+
+<span class="k">struct</span> <span class="n">my_int_pair</span> <span class="p">{</span> <span class="kt">int</span> <span class="n">a</span><span class="p">;</span> <span class="kt">int</span> <span class="n">b</span><span class="p">;</span> <span class="p">}</span>
+<span class="k">struct</span> <span class="n">my_int_pair</span> <span class="o">*</span><span class="n">buffer2</span><span class="p">;</span>
+<span class="n">MPI_Send</span><span class="p">(</span><span class="n">buffer2</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">MPI_DOUBLE_INT</span> <span class="cm">/*, ... */</span><span class="p">);</span> <span class="c1">// warning: actual buffer element</span>
+ <span class="c1">// type 'struct my_int_pair'</span>
+ <span class="c1">// doesn't match specified MPI_Datatype</span>
+</pre></div>
+</div>
+</li>
+<li><p class="first"><tt class="docutils literal"><span class="pre">must_be_null</span></tt> specifies that the expression should be a null pointer
+constant, for example:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="cm">/* In mpi.h */</span>
+<span class="k">extern</span> <span class="k">struct</span> <span class="n">mpi_datatype</span> <span class="n">mpi_datatype_null</span>
+ <span class="nf">__attribute__</span><span class="p">((</span> <span class="n">type_tag_for_datatype</span><span class="p">(</span><span class="n">mpi</span><span class="p">,</span> <span class="kt">void</span><span class="p">,</span> <span class="n">must_be_null</span><span class="p">)</span> <span class="p">));</span>
+
+<span class="cp">#define MPI_DATATYPE_NULL ((MPI_Datatype) &mpi_datatype_null)</span>
+
+<span class="cm">/* In user code */</span>
+<span class="n">MPI_Send</span><span class="p">(</span><span class="n">buffer</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">MPI_DATATYPE_NULL</span> <span class="cm">/*, ... */</span><span class="p">);</span> <span class="c1">// warning: MPI_DATATYPE_NULL</span>
+ <span class="c1">// was specified but buffer</span>
+ <span class="c1">// is not a null pointer</span>
+</pre></div>
+</div>
+</li>
+</ul>
+</div>
+</div>
+<div class="section" id="amd-gpu-register-attributes">
+<h2><a class="toc-backref" href="#id57">AMD GPU Register Attributes</a><a class="headerlink" href="#amd-gpu-register-attributes" title="Permalink to this headline">¶</a></h2>
+<p>Clang supports attributes for controlling register usage on AMD GPU
+targets. These attributes may be attached to a kernel function
+definition and is an optimization hint to the backend for the maximum
+number of registers to use. This is useful in cases where register
+limited occupancy is known to be an important factor for the
+performance for the kernel.</p>
+<p>The semantics are as follows:</p>
+<ul class="simple">
+<li>The backend will attempt to limit the number of used registers to
+the specified value, but the exact number used is not
+guaranteed. The number used may be rounded up to satisfy the
+allocation requirements or ABI constraints of the subtarget. For
+example, on Southern Islands VGPRs may only be allocated in
+increments of 4, so requesting a limit of 39 VGPRs will really
+attempt to use up to 40. Requesting more registers than the
+subtarget supports will truncate to the maximum allowed. The backend
+may also use fewer registers than requested whenever possible.</li>
+<li>0 implies the default no limit on register usage.</li>
+<li>Ignored on older VLIW subtargets which did not have separate scalar
+and vector registers, R600 through Northern Islands.</li>
+</ul>
+<div class="section" id="amdgpu-num-sgpr">
+<h3><a class="toc-backref" href="#id58">amdgpu_num_sgpr</a><a class="headerlink" href="#amdgpu-num-sgpr" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang supports the
+<tt class="docutils literal"><span class="pre">__attribute__((amdgpu_num_sgpr(<num_registers>)))</span></tt> attribute on AMD
+Southern Islands GPUs and later for controlling the number of scalar
+registers. A typical value would be between 8 and 104 in increments of
+8.</p>
+<p>Due to common instruction constraints, an additional 2-4 SGPRs are
+typically required for internal use depending on features used. This
+value is a hint for the total number of SGPRs to use, and not the
+number of user SGPRs, so no special consideration needs to be given
+for these.</p>
+</div>
+<div class="section" id="amdgpu-num-vgpr">
+<h3><a class="toc-backref" href="#id59">amdgpu_num_vgpr</a><a class="headerlink" href="#amdgpu-num-vgpr" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Clang supports the
+<tt class="docutils literal"><span class="pre">__attribute__((amdgpu_num_vgpr(<num_registers>)))</span></tt> attribute on AMD
+Southern Islands GPUs and later for controlling the number of vector
+registers. A typical value would be between 4 and 256 in increments
+of 4.</p>
+</div>
+</div>
+<div class="section" id="calling-conventions">
+<h2><a class="toc-backref" href="#id60">Calling Conventions</a><a class="headerlink" href="#calling-conventions" title="Permalink to this headline">¶</a></h2>
+<p>Clang supports several different calling conventions, depending on the target
+platform and architecture. The calling convention used for a function determines
+how parameters are passed, how results are returned to the caller, and other
+low-level details of calling a function.</p>
+<div class="section" id="fastcall-gnu-fastcall-fastcall-fastcall">
+<h3><a class="toc-backref" href="#id61">fastcall (gnu::fastcall, __fastcall, _fastcall)</a><a class="headerlink" href="#fastcall-gnu-fastcall-fastcall-fastcall" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>On 32-bit x86 targets, this attribute changes the calling convention of a
+function to use ECX and EDX as register parameters and clear parameters off of
+the stack on return. This convention does not support variadic calls or
+unprototyped functions in C, and has no effect on x86_64 targets. This calling
+convention is supported primarily for compatibility with existing code. Users
+seeking register parameters should use the <tt class="docutils literal"><span class="pre">regparm</span></tt> attribute, which does
+not require callee-cleanup. See the documentation for <a class="reference external" href="http://msdn.microsoft.com/en-us/library/6xa169sk.aspx">__fastcall</a> on MSDN.</p>
+</div>
+<div class="section" id="ms-abi-gnu-ms-abi">
+<h3><a class="toc-backref" href="#id62">ms_abi (gnu::ms_abi)</a><a class="headerlink" href="#ms-abi-gnu-ms-abi" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>On non-Windows x86_64 targets, this attribute changes the calling convention of
+a function to match the default convention used on Windows x86_64. This
+attribute has no effect on Windows targets or non-x86_64 targets.</p>
+</div>
+<div class="section" id="pcs-gnu-pcs">
+<h3><a class="toc-backref" href="#id63">pcs (gnu::pcs)</a><a class="headerlink" href="#pcs-gnu-pcs" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>On ARM targets, this attribute can be used to select calling conventions
+similar to <tt class="docutils literal"><span class="pre">stdcall</span></tt> on x86. Valid parameter values are “aapcs” and
+“aapcs-vfp”.</p>
+</div>
+<div class="section" id="regparm-gnu-regparm">
+<h3><a class="toc-backref" href="#id64">regparm (gnu::regparm)</a><a class="headerlink" href="#regparm-gnu-regparm" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>On 32-bit x86 targets, the regparm attribute causes the compiler to pass
+the first three integer parameters in EAX, EDX, and ECX instead of on the
+stack. This attribute has no effect on variadic functions, and all parameters
+are passed via the stack as normal.</p>
+</div>
+<div class="section" id="stdcall-gnu-stdcall-stdcall-stdcall">
+<h3><a class="toc-backref" href="#id65">stdcall (gnu::stdcall, __stdcall, _stdcall)</a><a class="headerlink" href="#stdcall-gnu-stdcall-stdcall-stdcall" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>On 32-bit x86 targets, this attribute changes the calling convention of a
+function to clear parameters off of the stack on return. This convention does
+not support variadic calls or unprototyped functions in C, and has no effect on
+x86_64 targets. This calling convention is used widely by the Windows API and
+COM applications. See the documentation for <a class="reference external" href="http://msdn.microsoft.com/en-us/library/zxk0tw93.aspx">__stdcall</a> on MSDN.</p>
+</div>
+<div class="section" id="thiscall-gnu-thiscall-thiscall-thiscall">
+<h3><a class="toc-backref" href="#id66">thiscall (gnu::thiscall, __thiscall, _thiscall)</a><a class="headerlink" href="#thiscall-gnu-thiscall-thiscall-thiscall" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>On 32-bit x86 targets, this attribute changes the calling convention of a
+function to use ECX for the first parameter (typically the implicit <tt class="docutils literal"><span class="pre">this</span></tt>
+parameter of C++ methods) and clear parameters off of the stack on return. This
+convention does not support variadic calls or unprototyped functions in C, and
+has no effect on x86_64 targets. See the documentation for <a class="reference external" href="http://msdn.microsoft.com/en-us/library/ek8tkfbw.aspx">__thiscall</a> on
+MSDN.</p>
+</div>
+<div class="section" id="vectorcall-vectorcall-vectorcall">
+<h3><a class="toc-backref" href="#id67">vectorcall (__vectorcall, _vectorcall)</a><a class="headerlink" href="#vectorcall-vectorcall-vectorcall" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>On 32-bit x86 <em>and</em> x86_64 targets, this attribute changes the calling
+convention of a function to pass vector parameters in SSE registers.</p>
+<p>On 32-bit x86 targets, this calling convention is similar to <tt class="docutils literal"><span class="pre">__fastcall</span></tt>.
+The first two integer parameters are passed in ECX and EDX. Subsequent integer
+parameters are passed in memory, and callee clears the stack. On x86_64
+targets, the callee does <em>not</em> clear the stack, and integer parameters are
+passed in RCX, RDX, R8, and R9 as is done for the default Windows x64 calling
+convention.</p>
+<p>On both 32-bit x86 and x86_64 targets, vector and floating point arguments are
+passed in XMM0-XMM5. Homogenous vector aggregates of up to four elements are
+passed in sequential SSE registers if enough are available. If AVX is enabled,
+256 bit vectors are passed in YMM0-YMM5. Any vector or aggregate type that
+cannot be passed in registers for any reason is passed by reference, which
+allows the caller to align the parameter memory.</p>
+<p>See the documentation for <a class="reference external" href="http://msdn.microsoft.com/en-us/library/dn375768.aspx">__vectorcall</a> on MSDN for more details.</p>
+</div>
+</div>
+<div class="section" id="consumed-annotation-checking">
+<h2><a class="toc-backref" href="#id68">Consumed Annotation Checking</a><a class="headerlink" href="#consumed-annotation-checking" title="Permalink to this headline">¶</a></h2>
+<p>Clang supports additional attributes for checking basic resource management
+properties, specifically for unique objects that have a single owning reference.
+The following attributes are currently supported, although <strong>the implementation
+for these annotations is currently in development and are subject to change.</strong></p>
+<div class="section" id="callable-when">
+<h3><a class="toc-backref" href="#id69">callable_when</a><a class="headerlink" href="#callable-when" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Use <tt class="docutils literal"><span class="pre">__attribute__((callable_when(...)))</span></tt> to indicate what states a method
+may be called in. Valid states are unconsumed, consumed, or unknown. Each
+argument to this attribute must be a quoted string. E.g.:</p>
+<p><tt class="docutils literal"><span class="pre">__attribute__((callable_when("unconsumed",</span> <span class="pre">"unknown")))</span></tt></p>
+</div>
+<div class="section" id="consumable">
+<h3><a class="toc-backref" href="#id70">consumable</a><a class="headerlink" href="#consumable" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Each <tt class="docutils literal"><span class="pre">class</span></tt> that uses any of the typestate annotations must first be marked
+using the <tt class="docutils literal"><span class="pre">consumable</span></tt> attribute. Failure to do so will result in a warning.</p>
+<p>This attribute accepts a single parameter that must be one of the following:
+<tt class="docutils literal"><span class="pre">unknown</span></tt>, <tt class="docutils literal"><span class="pre">consumed</span></tt>, or <tt class="docutils literal"><span class="pre">unconsumed</span></tt>.</p>
+</div>
+<div class="section" id="param-typestate">
+<h3><a class="toc-backref" href="#id71">param_typestate</a><a class="headerlink" href="#param-typestate" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>This attribute specifies expectations about function parameters. Calls to an
+function with annotated parameters will issue a warning if the corresponding
+argument isn’t in the expected state. The attribute is also used to set the
+initial state of the parameter when analyzing the function’s body.</p>
+</div>
+<div class="section" id="return-typestate">
+<h3><a class="toc-backref" href="#id72">return_typestate</a><a class="headerlink" href="#return-typestate" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">return_typestate</span></tt> attribute can be applied to functions or parameters.
+When applied to a function the attribute specifies the state of the returned
+value. The function’s body is checked to ensure that it always returns a value
+in the specified state. On the caller side, values returned by the annotated
+function are initialized to the given state.</p>
+<p>When applied to a function parameter it modifies the state of an argument after
+a call to the function returns. The function’s body is checked to ensure that
+the parameter is in the expected state before returning.</p>
+</div>
+<div class="section" id="set-typestate">
+<h3><a class="toc-backref" href="#id73">set_typestate</a><a class="headerlink" href="#set-typestate" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Annotate methods that transition an object into a new state with
+<tt class="docutils literal"><span class="pre">__attribute__((set_typestate(new_state)))</span></tt>. The new state must be
+unconsumed, consumed, or unknown.</p>
+</div>
+<div class="section" id="test-typestate">
+<h3><a class="toc-backref" href="#id74">test_typestate</a><a class="headerlink" href="#test-typestate" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>Use <tt class="docutils literal"><span class="pre">__attribute__((test_typestate(tested_state)))</span></tt> to indicate that a method
+returns true if the object is in the specified state..</p>
+</div>
+</div>
+<div class="section" id="opencl-address-spaces">
+<h2><a class="toc-backref" href="#id75">OpenCL Address Spaces</a><a class="headerlink" href="#opencl-address-spaces" title="Permalink to this headline">¶</a></h2>
+<p>The address space qualifier may be used to specify the region of memory that is
+used to allocate the object. OpenCL supports the following address spaces:
+__generic(generic), __global(global), __local(local), __private(private),
+__constant(constant).</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="n">__constant</span> <span class="kt">int</span> <span class="n">c</span> <span class="o">=</span> <span class="p">...;</span>
+
+<span class="n">__generic</span> <span class="kt">int</span><span class="o">*</span> <span class="nf">foo</span><span class="p">(</span><span class="n">global</span> <span class="kt">int</span><span class="o">*</span> <span class="n">g</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">__local</span> <span class="kt">int</span><span class="o">*</span> <span class="n">l</span><span class="p">;</span>
+ <span class="n">private</span> <span class="kt">int</span> <span class="n">p</span><span class="p">;</span>
+ <span class="p">...</span>
+ <span class="k">return</span> <span class="n">l</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>More details can be found in the OpenCL C language Spec v2.0, Section 6.5.</p>
+<div class="section" id="constant-constant">
+<h3><a class="toc-backref" href="#id76">constant (__constant)</a><a class="headerlink" href="#constant-constant" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The constant address space attribute signals that an object is located in
+a constant (non-modifiable) memory region. It is available to all work items.
+Any type can be annotated with the constant address space attribute. Objects
+with the constant address space qualifier can be declared in any scope and must
+have an initializer.</p>
+</div>
+<div class="section" id="generic-generic">
+<h3><a class="toc-backref" href="#id77">generic (__generic)</a><a class="headerlink" href="#generic-generic" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The generic address space attribute is only available with OpenCL v2.0 and later.
+It can be used with pointer types. Variables in global and local scope and
+function parameters in non-kernel functions can have the generic address space
+type attribute. It is intended to be a placeholder for any other address space
+except for ‘__constant’ in OpenCL code which can be used with multiple address
+spaces.</p>
+</div>
+<div class="section" id="global-global">
+<h3><a class="toc-backref" href="#id78">global (__global)</a><a class="headerlink" href="#global-global" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The global address space attribute specifies that an object is allocated in
+global memory, which is accessible by all work items. The content stored in this
+memory area persists between kernel executions. Pointer types to the global
+address space are allowed as function parameters or local variables. Starting
+with OpenCL v2.0, the global address space can be used with global (program
+scope) variables and static local variable as well.</p>
+</div>
+<div class="section" id="local-local">
+<h3><a class="toc-backref" href="#id79">local (__local)</a><a class="headerlink" href="#local-local" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The local address space specifies that an object is allocated in the local (work
+group) memory area, which is accessible to all work items in the same work
+group. The content stored in this memory region is not accessible after
+the kernel execution ends. In a kernel function scope, any variable can be in
+the local address space. In other scopes, only pointer types to the local address
+space are allowed. Local address space variables cannot have an initializer.</p>
+</div>
+<div class="section" id="private-private">
+<h3><a class="toc-backref" href="#id80">private (__private)</a><a class="headerlink" href="#private-private" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The private address space specifies that an object is allocated in the private
+(work item) memory. Other work items cannot access the same memory area and its
+content is destroyed after work item execution ends. Local variables can be
+declared in the private address space. Function arguments are always in the
+private address space. Kernel function arguments of a pointer or an array type
+cannot point to the private address space.</p>
+</div>
+</div>
+<div class="section" id="nullability-attributes">
+<h2><a class="toc-backref" href="#id81">Nullability Attributes</a><a class="headerlink" href="#nullability-attributes" title="Permalink to this headline">¶</a></h2>
+<p>Whether a particular pointer may be “null” is an important concern when working with pointers in the C family of languages. The various nullability attributes indicate whether a particular pointer can be null or not, which makes APIs more expressive and can help static analysis tools identify bugs involving null pointers. Clang supports several kinds of nullability attributes: the <tt class="docutils literal"><span class="pre">nonnull</span></tt> and <tt class="docutils literal"><span class="pre">returns_nonnull</span></tt> attributes indicate which function or method parameters and result types can never be null, while nullability type qualifiers indicate which pointer types can be null (<tt class="docutils literal"><span class="pre">_Nullable</span></tt>) or cannot be null (<tt class="docutils literal"><span class="pre">_Nonnull</span></tt>).</p>
+<p>The nullability (type) qualifiers express whether a value of a given pointer type can be null (the <tt class="docutils literal"><span class="pre">_Nullable</span></tt> qualifier), doesn’t have a defined meaning for null (the <tt class="docutils literal"><span class="pre">_Nonnull</span></tt> qualifier), or for which the purpose of null is unclear (the <tt class="docutils literal"><span class="pre">_Null_unspecified</span></tt> qualifier). Because nullability qualifiers are expressed within the type system, they are more general than the <tt class="docutils literal"><span class="pre">nonnull</span></tt> and <tt class="docutils literal"><span class="pre">returns_nonnull</span></tt> attributes, allowing one to express (for example) a nullable pointer to an array of nonnull pointers. Nullability qualifiers are written to the right of the pointer to which they apply. For example:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="c1">// No meaningful result when 'ptr' is null (here, it happens to be undefined behavior).</span>
+<span class="kt">int</span> <span class="nf">fetch</span><span class="p">(</span><span class="kt">int</span> <span class="o">*</span> <span class="n">_Nonnull</span> <span class="n">ptr</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="o">*</span><span class="n">ptr</span><span class="p">;</span> <span class="p">}</span>
+
+<span class="c1">// 'ptr' may be null.</span>
+<span class="kt">int</span> <span class="nf">fetch_or_zero</span><span class="p">(</span><span class="kt">int</span> <span class="o">*</span> <span class="n">_Nullable</span> <span class="n">ptr</span><span class="p">)</span> <span class="p">{</span>
+ <span class="k">return</span> <span class="n">ptr</span> <span class="o">?</span> <span class="o">*</span><span class="n">ptr</span> <span class="o">:</span> <span class="mi">0</span><span class="p">;</span>
+<span class="p">}</span>
+
+<span class="c1">// A nullable pointer to non-null pointers to const characters.</span>
+<span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="nf">join_strings</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span> <span class="n">_Nonnull</span> <span class="o">*</span> <span class="n">_Nullable</span> <span class="n">strings</span><span class="p">,</span> <span class="kt">unsigned</span> <span class="n">n</span><span class="p">);</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>In Objective-C, there is an alternate spelling for the nullability qualifiers that can be used in Objective-C methods and properties using context-sensitive, non-underscored keywords. For example:</p>
+<blockquote>
+<div><div class="highlight-objective-c"><div class="highlight"><pre><span class="k">@interface</span> <span class="nc">NSView</span> : <span class="nc">NSResponder</span>
+ <span class="o">-</span> <span class="p">(</span><span class="n">nullable</span> <span class="n">NSView</span> <span class="o">*</span><span class="p">)</span><span class="n">ancestorSharedWithView</span><span class="o">:</span><span class="p">(</span><span class="n">nonnull</span> <span class="n">NSView</span> <span class="o">*</span><span class="p">)</span><span class="n">aView</span><span class="p">;</span>
+ <span class="k">@property</span> <span class="p">(</span><span class="n">assign</span><span class="p">,</span> <span class="n">nullable</span><span class="p">)</span> <span class="n">NSView</span> <span class="o">*</span><span class="n">superview</span><span class="p">;</span>
+ <span class="k">@property</span> <span class="p">(</span><span class="n">readonly</span><span class="p">,</span> <span class="n">nonnull</span><span class="p">)</span> <span class="n">NSArray</span> <span class="o">*</span><span class="n">subviews</span><span class="p">;</span>
+<span class="k">@end</span>
+</pre></div>
+</div>
+</div></blockquote>
+<div class="section" id="nonnull-gnu-nonnull">
+<h3><a class="toc-backref" href="#id82">nonnull (gnu::nonnull)</a><a class="headerlink" href="#nonnull-gnu-nonnull" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">nonnull</span></tt> attribute indicates that some function parameters must not be null, and can be used in several different ways. It’s original usage (<a class="reference external" href="https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#Common-Function-Attributes">from GCC</a>) is as a function (or Objective-C method) attribute that specifies which parameters of the function are nonnull in a comma-separated list. For example:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="k">extern</span> <span class="kt">void</span> <span class="o">*</span> <span class="nf">my_memcpy</span> <span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">dest</span><span class="p">,</span> <span class="k">const</span> <span class="kt">void</span> <span class="o">*</span><span class="n">src</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">len</span><span class="p">)</span>
+ <span class="n">__attribute__</span><span class="p">((</span><span class="n">nonnull</span> <span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)));</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>Here, the <tt class="docutils literal"><span class="pre">nonnull</span></tt> attribute indicates that parameters 1 and 2
+cannot have a null value. Omitting the parenthesized list of parameter indices means that all parameters of pointer type cannot be null:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="k">extern</span> <span class="kt">void</span> <span class="o">*</span> <span class="nf">my_memcpy</span> <span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">dest</span><span class="p">,</span> <span class="k">const</span> <span class="kt">void</span> <span class="o">*</span><span class="n">src</span><span class="p">,</span> <span class="kt">size_t</span> <span class="n">len</span><span class="p">)</span>
+ <span class="n">__attribute__</span><span class="p">((</span><span class="n">nonnull</span><span class="p">));</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>Clang also allows the <tt class="docutils literal"><span class="pre">nonnull</span></tt> attribute to be placed directly on a function (or Objective-C method) parameter, eliminating the need to specify the parameter index ahead of type. For example:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="k">extern</span> <span class="kt">void</span> <span class="o">*</span> <span class="nf">my_memcpy</span> <span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">dest</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">nonnull</span><span class="p">)),</span>
+ <span class="k">const</span> <span class="kt">void</span> <span class="o">*</span><span class="n">src</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">nonnull</span><span class="p">)),</span> <span class="kt">size_t</span> <span class="n">len</span><span class="p">);</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>Note that the <tt class="docutils literal"><span class="pre">nonnull</span></tt> attribute indicates that passing null to a non-null parameter is undefined behavior, which the optimizer may take advantage of to, e.g., remove null checks. The <tt class="docutils literal"><span class="pre">_Nonnull</span></tt> type qualifier indicates that a pointer cannot be null in a more general manner (because it is part of the type system) and does not imply undefined behavior, making it more widely applicable.</p>
+</div>
+<div class="section" id="returns-nonnull-gnu-returns-nonnull">
+<h3><a class="toc-backref" href="#id83">returns_nonnull (gnu::returns_nonnull)</a><a class="headerlink" href="#returns-nonnull-gnu-returns-nonnull" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td>X</td>
+<td>X</td>
+<td> </td>
+<td> </td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">returns_nonnull</span></tt> attribute indicates that a particular function (or Objective-C method) always returns a non-null pointer. For example, a particular system <tt class="docutils literal"><span class="pre">malloc</span></tt> might be defined to terminate a process when memory is not available rather than returning a null pointer:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="k">extern</span> <span class="kt">void</span> <span class="o">*</span> <span class="nf">malloc</span> <span class="p">(</span><span class="kt">size_t</span> <span class="n">size</span><span class="p">)</span> <span class="n">__attribute__</span><span class="p">((</span><span class="n">returns_nonnull</span><span class="p">));</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>The <tt class="docutils literal"><span class="pre">returns_nonnull</span></tt> attribute implies that returning a null pointer is undefined behavior, which the optimizer may take advantage of. The <tt class="docutils literal"><span class="pre">_Nonnull</span></tt> type qualifier indicates that a pointer cannot be null in a more general manner (because it is part of the type system) and does not imply undefined behavior, making it more widely applicable</p>
+</div>
+<div class="section" id="nonnull">
+<h3><a class="toc-backref" href="#id84">_Nonnull</a><a class="headerlink" href="#nonnull" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">_Nonnull</span></tt> nullability qualifier indicates that null is not a meaningful value for a value of the <tt class="docutils literal"><span class="pre">_Nonnull</span></tt> pointer type. For example, given a declaration such as:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">fetch</span><span class="p">(</span><span class="kt">int</span> <span class="o">*</span> <span class="n">_Nonnull</span> <span class="n">ptr</span><span class="p">);</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>a caller of <tt class="docutils literal"><span class="pre">fetch</span></tt> should not provide a null value, and the compiler will produce a warning if it sees a literal null value passed to <tt class="docutils literal"><span class="pre">fetch</span></tt>. Note that, unlike the declaration attribute <tt class="docutils literal"><span class="pre">nonnull</span></tt>, the presence of <tt class="docutils literal"><span class="pre">_Nonnull</span></tt> does not imply that passing null is undefined behavior: <tt class="docutils literal"><span class="pre">fetch</span></tt> is free to consider null undefined behavior or (perhaps for backward-compatibility reasons) defensively handle null.</p>
+</div>
+<div class="section" id="null-unspecified">
+<h3><a class="toc-backref" href="#id85">_Null_unspecified</a><a class="headerlink" href="#null-unspecified" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">_Null_unspecified</span></tt> nullability qualifier indicates that neither the <tt class="docutils literal"><span class="pre">_Nonnull</span></tt> nor <tt class="docutils literal"><span class="pre">_Nullable</span></tt> qualifiers make sense for a particular pointer type. It is used primarily to indicate that the role of null with specific pointers in a nullability-annotated header is unclear, e.g., due to overly-complex implementations or historical factors with a long-lived API.</p>
+</div>
+<div class="section" id="nullable">
+<h3><a class="toc-backref" href="#id86">_Nullable</a><a class="headerlink" href="#nullable" title="Permalink to this headline">¶</a></h3>
+<table border="1" class="docutils">
+<caption>Supported Syntaxes</caption>
+<colgroup>
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+<col width="20%" />
+</colgroup>
+<thead valign="bottom">
+<tr class="row-odd"><th class="head">GNU</th>
+<th class="head">C++11</th>
+<th class="head">__declspec</th>
+<th class="head">Keyword</th>
+<th class="head">Pragma</th>
+</tr>
+</thead>
+<tbody valign="top">
+<tr class="row-even"><td> </td>
+<td> </td>
+<td> </td>
+<td>X</td>
+<td> </td>
+</tr>
+</tbody>
+</table>
+<p>The <tt class="docutils literal"><span class="pre">_Nullable</span></tt> nullability qualifier indicates that a value of the <tt class="docutils literal"><span class="pre">_Nullable</span></tt> pointer type can be null. For example, given:</p>
+<blockquote>
+<div><div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="nf">fetch_or_zero</span><span class="p">(</span><span class="kt">int</span> <span class="o">*</span> <span class="n">_Nullable</span> <span class="n">ptr</span><span class="p">);</span>
+</pre></div>
+</div>
+</div></blockquote>
+<p>a caller of <tt class="docutils literal"><span class="pre">fetch_or_zero</span></tt> can provide null.</p>
+</div>
+</div>
+</div>
+
+
+ </div>
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+ ::
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==============================================================================
--- www-releases/trunk/3.8.0/tools/clang/docs/AutomaticReferenceCounting.html (added)
+++ www-releases/trunk/3.8.0/tools/clang/docs/AutomaticReferenceCounting.html Tue Mar 8 12:28:17 2016
@@ -0,0 +1,2085 @@
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+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+ <title>Objective-C Automatic Reference Counting (ARC) — Clang 3.8 documentation</title>
+
+ <link rel="stylesheet" href="_static/haiku.css" type="text/css" />
+ <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
+
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+ URL_ROOT: './',
+ VERSION: '3.8',
+ COLLAPSE_INDEX: false,
+ FILE_SUFFIX: '.html',
+ HAS_SOURCE: true
+ };
+ </script>
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+ <link rel="top" title="Clang 3.8 documentation" href="index.html" />
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+ <link rel="prev" title="Block Implementation Specification" href="Block-ABI-Apple.html" />
+ </head>
+ <body>
+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>Clang 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>Objective-C Automatic Reference Counting (ARC)</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ « <a href="Block-ABI-Apple.html">Block Implementation Specification</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="AttributeReference.html">Attributes in Clang</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <style>
+ .arc-term { font-style: italic; font-weight: bold; }
+ .revision { font-style: italic; }
+ .when-revised { font-weight: bold; font-style: normal; }
+
+ /*
+ * Automatic numbering is described in this article:
+ * http://dev.opera.com/articles/view/automatic-numbering-with-css-counters/
+ */
+ /*
+ * Automatic numbering for the TOC.
+ * This is wrong from the semantics point of view, since it is an ordered
+ * list, but uses "ul" tag.
+ */
+ div#contents.contents.local ul {
+ counter-reset: toc-section;
+ list-style-type: none;
+ }
+ div#contents.contents.local ul li {
+ counter-increment: toc-section;
+ background: none; // Remove bullets
+ }
+ div#contents.contents.local ul li a.reference:before {
+ content: counters(toc-section, ".") " ";
+ }
+
+ /* Automatic numbering for the body. */
+ body {
+ counter-reset: section subsection subsubsection;
+ }
+ .section h2 {
+ counter-reset: subsection subsubsection;
+ counter-increment: section;
+ }
+ .section h2 a.toc-backref:before {
+ content: counter(section) " ";
+ }
+ .section h3 {
+ counter-reset: subsubsection;
+ counter-increment: subsection;
+ }
+ .section h3 a.toc-backref:before {
+ content: counter(section) "." counter(subsection) " ";
+ }
+ .section h4 {
+ counter-increment: subsubsection;
+ }
+ .section h4 a.toc-backref:before {
+ content: counter(section) "." counter(subsection) "." counter(subsubsection) " ";
+ }
+</style><div class="section" id="objective-c-automatic-reference-counting-arc">
+<h1>Objective-C Automatic Reference Counting (ARC)<a class="headerlink" href="#objective-c-automatic-reference-counting-arc" title="Permalink to this headline">¶</a></h1>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#about-this-document" id="id4">About this document</a><ul>
+<li><a class="reference internal" href="#purpose" id="id5">Purpose</a></li>
+<li><a class="reference internal" href="#background" id="id6">Background</a></li>
+<li><a class="reference internal" href="#evolution" id="id7">Evolution</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#general" id="id8">General</a></li>
+<li><a class="reference internal" href="#retainable-object-pointers" id="id9">Retainable object pointers</a><ul>
+<li><a class="reference internal" href="#retain-count-semantics" id="id10">Retain count semantics</a></li>
+<li><a class="reference internal" href="#retainable-object-pointers-as-operands-and-arguments" id="id11">Retainable object pointers as operands and arguments</a><ul>
+<li><a class="reference internal" href="#consumed-parameters" id="id12">Consumed parameters</a></li>
+<li><a class="reference internal" href="#retained-return-values" id="id13">Retained return values</a></li>
+<li><a class="reference internal" href="#unretained-return-values" id="id14">Unretained return values</a></li>
+<li><a class="reference internal" href="#bridged-casts" id="id15">Bridged casts</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#restrictions" id="id16">Restrictions</a><ul>
+<li><a class="reference internal" href="#conversion-of-retainable-object-pointers" id="id17">Conversion of retainable object pointers</a></li>
+<li><a class="reference internal" href="#conversion-to-retainable-object-pointer-type-of-expressions-with-known-semantics" id="id18">Conversion to retainable object pointer type of expressions with known semantics</a></li>
+<li><a class="reference internal" href="#conversion-from-retainable-object-pointer-type-in-certain-contexts" id="id19">Conversion from retainable object pointer type in certain contexts</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a class="reference internal" href="#ownership-qualification" id="id20">Ownership qualification</a><ul>
+<li><a class="reference internal" href="#spelling" id="id21">Spelling</a><ul>
+<li><a class="reference internal" href="#property-declarations" id="id22">Property declarations</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#semantics" id="id23">Semantics</a></li>
+<li><a class="reference internal" href="#arc-ownership-restrictions" id="id24">Restrictions</a><ul>
+<li><a class="reference internal" href="#weak-unavailable-types" id="id25">Weak-unavailable types</a></li>
+<li><a class="reference internal" href="#storage-duration-of-autoreleasing-objects" id="id26">Storage duration of <tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> objects</a></li>
+<li><a class="reference internal" href="#conversion-of-pointers-to-ownership-qualified-types" id="id27">Conversion of pointers to ownership-qualified types</a></li>
+<li><a class="reference internal" href="#passing-to-an-out-parameter-by-writeback" id="id28">Passing to an out parameter by writeback</a></li>
+<li><a class="reference internal" href="#ownership-qualified-fields-of-structs-and-unions" id="id29">Ownership-qualified fields of structs and unions</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#ownership-inference" id="id30">Ownership inference</a><ul>
+<li><a class="reference internal" href="#objects" id="id31">Objects</a></li>
+<li><a class="reference internal" href="#indirect-parameters" id="id32">Indirect parameters</a></li>
+<li><a class="reference internal" href="#template-arguments" id="id33">Template arguments</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a class="reference internal" href="#method-families" id="id34">Method families</a><ul>
+<li><a class="reference internal" href="#explicit-method-family-control" id="id35">Explicit method family control</a></li>
+<li><a class="reference internal" href="#semantics-of-method-families" id="id36">Semantics of method families</a><ul>
+<li><a class="reference internal" href="#semantics-of-init" id="id37">Semantics of <tt class="docutils literal"><span class="pre">init</span></tt></a></li>
+<li><a class="reference internal" href="#related-result-types" id="id38">Related result types</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a class="reference internal" href="#optimization" id="id39">Optimization</a><ul>
+<li><a class="reference internal" href="#object-liveness" id="id40">Object liveness</a></li>
+<li><a class="reference internal" href="#no-object-lifetime-extension" id="id41">No object lifetime extension</a></li>
+<li><a class="reference internal" href="#precise-lifetime-semantics" id="id42">Precise lifetime semantics</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#miscellaneous" id="id43">Miscellaneous</a><ul>
+<li><a class="reference internal" href="#special-methods" id="id44">Special methods</a><ul>
+<li><a class="reference internal" href="#memory-management-methods" id="id45">Memory management methods</a></li>
+<li><a class="reference internal" href="#dealloc" id="id46"><tt class="docutils literal"><span class="pre">dealloc</span></tt></a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#autoreleasepool" id="id47"><tt class="docutils literal"><span class="pre">@autoreleasepool</span></tt></a></li>
+<li><a class="reference internal" href="#self" id="id48"><tt class="docutils literal"><span class="pre">self</span></tt></a></li>
+<li><a class="reference internal" href="#fast-enumeration-iteration-variables" id="id49">Fast enumeration iteration variables</a></li>
+<li><a class="reference internal" href="#blocks" id="id50">Blocks</a></li>
+<li><a class="reference internal" href="#exceptions" id="id51">Exceptions</a></li>
+<li><a class="reference internal" href="#interior-pointers" id="id52">Interior pointers</a></li>
+<li><a class="reference internal" href="#c-retainable-pointer-types" id="id53">C retainable pointer types</a><ul>
+<li><a class="reference internal" href="#auditing-of-c-retainable-pointer-interfaces" id="id54">Auditing of C retainable pointer interfaces</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a class="reference internal" href="#runtime-support" id="id55">Runtime support</a><ul>
+<li><a class="reference internal" href="#arc-runtime-objc-autorelease" id="id56"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_autorelease(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#void-objc-autoreleasepoolpop-void-pool" id="id57"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_autoreleasePoolPop(void</span> <span class="pre">*pool);</span></tt></a></li>
+<li><a class="reference internal" href="#void-objc-autoreleasepoolpush-void" id="id58"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">*objc_autoreleasePoolPush(void);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-autoreleasereturnvalue" id="id59"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_autoreleaseReturnValue(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#void-objc-copyweak-id-dest-id-src" id="id60"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_copyWeak(id</span> <span class="pre">*dest,</span> <span class="pre">id</span> <span class="pre">*src);</span></tt></a></li>
+<li><a class="reference internal" href="#void-objc-destroyweak-id-object" id="id61"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_destroyWeak(id</span> <span class="pre">*object);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-initweak" id="id62"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_initWeak(id</span> <span class="pre">*object,</span> <span class="pre">id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-loadweak" id="id63"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_loadWeak(id</span> <span class="pre">*object);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-loadweakretained" id="id64"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_loadWeakRetained(id</span> <span class="pre">*object);</span></tt></a></li>
+<li><a class="reference internal" href="#void-objc-moveweak-id-dest-id-src" id="id65"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_moveWeak(id</span> <span class="pre">*dest,</span> <span class="pre">id</span> <span class="pre">*src);</span></tt></a></li>
+<li><a class="reference internal" href="#void-objc-release-id-value" id="id66"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_release(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-retain" id="id67"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retain(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-retainautorelease" id="id68"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainAutorelease(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-retainautoreleasereturnvalue" id="id69"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainAutoreleaseReturnValue(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-retainautoreleasedreturnvalue" id="id70"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainAutoreleasedReturnValue(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-retainblock" id="id71"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainBlock(id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-storestrong" id="id72"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_storeStrong(id</span> <span class="pre">*object,</span> <span class="pre">id</span> <span class="pre">value);</span></tt></a></li>
+<li><a class="reference internal" href="#arc-runtime-objc-storeweak" id="id73"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_storeWeak(id</span> <span class="pre">*object,</span> <span class="pre">id</span> <span class="pre">value);</span></tt></a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="about-this-document">
+<span id="arc-meta"></span><h2><a class="toc-backref" href="#id4">About this document</a><a class="headerlink" href="#about-this-document" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="purpose">
+<span id="arc-meta-purpose"></span><h3><a class="toc-backref" href="#id5">Purpose</a><a class="headerlink" href="#purpose" title="Permalink to this headline">¶</a></h3>
+<p>The first and primary purpose of this document is to serve as a complete
+technical specification of Automatic Reference Counting. Given a core
+Objective-C compiler and runtime, it should be possible to write a compiler and
+runtime which implements these new semantics.</p>
+<p>The secondary purpose is to act as a rationale for why ARC was designed in this
+way. This should remain tightly focused on the technical design and should not
+stray into marketing speculation.</p>
+</div>
+<div class="section" id="background">
+<span id="arc-meta-background"></span><h3><a class="toc-backref" href="#id6">Background</a><a class="headerlink" href="#background" title="Permalink to this headline">¶</a></h3>
+<p>This document assumes a basic familiarity with C.</p>
+<p><span class="arc-term">Blocks</span> are a C language extension for creating anonymous functions.
+Users interact with and transfer block objects using <span class="arc-term">block
+pointers</span>, which are represented like a normal pointer. A block may capture
+values from local variables; when this occurs, memory must be dynamically
+allocated. The initial allocation is done on the stack, but the runtime
+provides a <tt class="docutils literal"><span class="pre">Block_copy</span></tt> function which, given a block pointer, either copies
+the underlying block object to the heap, setting its reference count to 1 and
+returning the new block pointer, or (if the block object is already on the
+heap) increases its reference count by 1. The paired function is
+<tt class="docutils literal"><span class="pre">Block_release</span></tt>, which decreases the reference count by 1 and destroys the
+object if the count reaches zero and is on the heap.</p>
+<p>Objective-C is a set of language extensions, significant enough to be
+considered a different language. It is a strict superset of C. The extensions
+can also be imposed on C++, producing a language called Objective-C++. The
+primary feature is a single-inheritance object system; we briefly describe the
+modern dialect.</p>
+<p>Objective-C defines a new type kind, collectively called the <span class="arc-term">object
+pointer types</span>. This kind has two notable builtin members, <tt class="docutils literal"><span class="pre">id</span></tt> and
+<tt class="docutils literal"><span class="pre">Class</span></tt>; <tt class="docutils literal"><span class="pre">id</span></tt> is the final supertype of all object pointers. The validity
+of conversions between object pointer types is not checked at runtime. Users
+may define <span class="arc-term">classes</span>; each class is a type, and the pointer to that
+type is an object pointer type. A class may have a superclass; its pointer
+type is a subtype of its superclass’s pointer type. A class has a set of
+<span class="arc-term">ivars</span>, fields which appear on all instances of that class. For
+every class <em>T</em> there’s an associated metaclass; it has no fields, its
+superclass is the metaclass of <em>T</em>‘s superclass, and its metaclass is a global
+class. Every class has a global object whose class is the class’s metaclass;
+metaclasses have no associated type, so pointers to this object have type
+<tt class="docutils literal"><span class="pre">Class</span></tt>.</p>
+<p>A class declaration (<tt class="docutils literal"><span class="pre">@interface</span></tt>) declares a set of <span class="arc-term">methods</span>. A
+method has a return type, a list of argument types, and a <span class="arc-term">selector</span>:
+a name like <tt class="docutils literal"><span class="pre">foo:bar:baz:</span></tt>, where the number of colons corresponds to the
+number of formal arguments. A method may be an instance method, in which case
+it can be invoked on objects of the class, or a class method, in which case it
+can be invoked on objects of the metaclass. A method may be invoked by
+providing an object (called the <span class="arc-term">receiver</span>) and a list of formal
+arguments interspersed with the selector, like so:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="p">[</span><span class="n">receiver</span> <span class="n">foo</span><span class="o">:</span> <span class="n">fooArg</span> <span class="n">bar</span><span class="o">:</span> <span class="n">barArg</span> <span class="n">baz</span><span class="o">:</span> <span class="n">bazArg</span><span class="p">]</span>
+</pre></div>
+</div>
+<p>This looks in the dynamic class of the receiver for a method with this name,
+then in that class’s superclass, etc., until it finds something it can execute.
+The receiver “expression” may also be the name of a class, in which case the
+actual receiver is the class object for that class, or (within method
+definitions) it may be <tt class="docutils literal"><span class="pre">super</span></tt>, in which case the lookup algorithm starts
+with the static superclass instead of the dynamic class. The actual methods
+dynamically found in a class are not those declared in the <tt class="docutils literal"><span class="pre">@interface</span></tt>, but
+those defined in a separate <tt class="docutils literal"><span class="pre">@implementation</span></tt> declaration; however, when
+compiling a call, typechecking is done based on the methods declared in the
+<tt class="docutils literal"><span class="pre">@interface</span></tt>.</p>
+<p>Method declarations may also be grouped into <span class="arc-term">protocols</span>, which are not
+inherently associated with any class, but which classes may claim to follow.
+Object pointer types may be qualified with additional protocols that the object
+is known to support.</p>
+<p><span class="arc-term">Class extensions</span> are collections of ivars and methods, designed to
+allow a class’s <tt class="docutils literal"><span class="pre">@interface</span></tt> to be split across multiple files; however,
+there is still a primary implementation file which must see the
+<tt class="docutils literal"><span class="pre">@interface</span></tt>s of all class extensions. <span class="arc-term">Categories</span> allow
+methods (but not ivars) to be declared <em>post hoc</em> on an arbitrary class; the
+methods in the category’s <tt class="docutils literal"><span class="pre">@implementation</span></tt> will be dynamically added to that
+class’s method tables which the category is loaded at runtime, replacing those
+methods in case of a collision.</p>
+<p>In the standard environment, objects are allocated on the heap, and their
+lifetime is manually managed using a reference count. This is done using two
+instance methods which all classes are expected to implement: <tt class="docutils literal"><span class="pre">retain</span></tt>
+increases the object’s reference count by 1, whereas <tt class="docutils literal"><span class="pre">release</span></tt> decreases it
+by 1 and calls the instance method <tt class="docutils literal"><span class="pre">dealloc</span></tt> if the count reaches 0. To
+simplify certain operations, there is also an <span class="arc-term">autorelease pool</span>, a
+thread-local list of objects to call <tt class="docutils literal"><span class="pre">release</span></tt> on later; an object can be
+added to this pool by calling <tt class="docutils literal"><span class="pre">autorelease</span></tt> on it.</p>
+<p>Block pointers may be converted to type <tt class="docutils literal"><span class="pre">id</span></tt>; block objects are laid out in a
+way that makes them compatible with Objective-C objects. There is a builtin
+class that all block objects are considered to be objects of; this class
+implements <tt class="docutils literal"><span class="pre">retain</span></tt> by adjusting the reference count, not by calling
+<tt class="docutils literal"><span class="pre">Block_copy</span></tt>.</p>
+</div>
+<div class="section" id="evolution">
+<span id="arc-meta-evolution"></span><h3><a class="toc-backref" href="#id7">Evolution</a><a class="headerlink" href="#evolution" title="Permalink to this headline">¶</a></h3>
+<p>ARC is under continual evolution, and this document must be updated as the
+language progresses.</p>
+<p>If a change increases the expressiveness of the language, for example by
+lifting a restriction or by adding new syntax, the change will be annotated
+with a revision marker, like so:</p>
+<blockquote>
+<div>ARC applies to Objective-C pointer types, block pointer types, and
+<span class="when-revised">[beginning Apple 8.0, LLVM 3.8]</span> <span class="revision">BPTRs declared
+within</span> <tt class="docutils literal"><span class="pre">extern</span> <span class="pre">"BCPL"</span></tt> blocks.</div></blockquote>
+<p>For now, it is sensible to version this document by the releases of its sole
+implementation (and its host project), clang. “LLVM X.Y” refers to an
+open-source release of clang from the LLVM project. “Apple X.Y” refers to an
+Apple-provided release of the Apple LLVM Compiler. Other organizations that
+prepare their own, separately-versioned clang releases and wish to maintain
+similar information in this document should send requests to cfe-dev.</p>
+<p>If a change decreases the expressiveness of the language, for example by
+imposing a new restriction, this should be taken as an oversight in the
+original specification and something to be avoided in all versions. Such
+changes are generally to be avoided.</p>
+</div>
+</div>
+<div class="section" id="general">
+<span id="arc-general"></span><h2><a class="toc-backref" href="#id8">General</a><a class="headerlink" href="#general" title="Permalink to this headline">¶</a></h2>
+<p>Automatic Reference Counting implements automatic memory management for
+Objective-C objects and blocks, freeing the programmer from the need to
+explicitly insert retains and releases. It does not provide a cycle collector;
+users must explicitly manage the lifetime of their objects, breaking cycles
+manually or with weak or unsafe references.</p>
+<p>ARC may be explicitly enabled with the compiler flag <tt class="docutils literal"><span class="pre">-fobjc-arc</span></tt>. It may
+also be explicitly disabled with the compiler flag <tt class="docutils literal"><span class="pre">-fno-objc-arc</span></tt>. The last
+of these two flags appearing on the compile line “wins”.</p>
+<p>If ARC is enabled, <tt class="docutils literal"><span class="pre">__has_feature(objc_arc)</span></tt> will expand to 1 in the
+preprocessor. For more information about <tt class="docutils literal"><span class="pre">__has_feature</span></tt>, see the
+<a class="reference internal" href="LanguageExtensions.html#langext-has-feature-has-extension"><em>language extensions</em></a> document.</p>
+</div>
+<div class="section" id="retainable-object-pointers">
+<span id="arc-objects"></span><h2><a class="toc-backref" href="#id9">Retainable object pointers</a><a class="headerlink" href="#retainable-object-pointers" title="Permalink to this headline">¶</a></h2>
+<p>This section describes retainable object pointers, their basic operations, and
+the restrictions imposed on their use under ARC. Note in particular that it
+covers the rules for pointer <em>values</em> (patterns of bits indicating the location
+of a pointed-to object), not pointer <em>objects</em> (locations in memory which store
+pointer values). The rules for objects are covered in the next section.</p>
+<p>A <span class="arc-term">retainable object pointer</span> (or “retainable pointer”) is a value of
+a <span class="arc-term">retainable object pointer type</span> (“retainable type”). There are
+three kinds of retainable object pointer types:</p>
+<ul class="simple">
+<li>block pointers (formed by applying the caret (<tt class="docutils literal"><span class="pre">^</span></tt>) declarator sigil to a
+function type)</li>
+<li>Objective-C object pointers (<tt class="docutils literal"><span class="pre">id</span></tt>, <tt class="docutils literal"><span class="pre">Class</span></tt>, <tt class="docutils literal"><span class="pre">NSFoo*</span></tt>, etc.)</li>
+<li>typedefs marked with <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt></li>
+</ul>
+<p>Other pointer types, such as <tt class="docutils literal"><span class="pre">int*</span></tt> and <tt class="docutils literal"><span class="pre">CFStringRef</span></tt>, are not subject to
+ARC’s semantics and restrictions.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>We are not at liberty to require all code to be recompiled with ARC;
+therefore, ARC must interoperate with Objective-C code which manages retains
+and releases manually. In general, there are three requirements in order for
+a compiler-supported reference-count system to provide reliable
+interoperation:</p>
+<ul class="last simple">
+<li>The type system must reliably identify which objects are to be managed. An
+<tt class="docutils literal"><span class="pre">int*</span></tt> might be a pointer to a <tt class="docutils literal"><span class="pre">malloc</span></tt>‘ed array, or it might be an
+interior pointer to such an array, or it might point to some field or local
+variable. In contrast, values of the retainable object pointer types are
+never interior.</li>
+<li>The type system must reliably indicate how to manage objects of a type.
+This usually means that the type must imply a procedure for incrementing
+and decrementing retain counts. Supporting single-ownership objects
+requires a lot more explicit mediation in the language.</li>
+<li>There must be reliable conventions for whether and when “ownership” is
+passed between caller and callee, for both arguments and return values.
+Objective-C methods follow such a convention very reliably, at least for
+system libraries on Mac OS X, and functions always pass objects at +0. The
+C-based APIs for Core Foundation objects, on the other hand, have much more
+varied transfer semantics.</li>
+</ul>
+</div>
+<p>The use of <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> typedefs is not recommended. If it’s
+absolutely necessary to use this attribute, be very explicit about using the
+typedef, and do not assume that it will be preserved by language features like
+<tt class="docutils literal"><span class="pre">__typeof</span></tt> and C++ template argument substitution.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Any compiler operation which incidentally strips type “sugar” from a type
+will yield a type without the attribute, which may result in unexpected
+behavior.</p>
+</div>
+<div class="section" id="retain-count-semantics">
+<span id="arc-objects-retains"></span><h3><a class="toc-backref" href="#id10">Retain count semantics</a><a class="headerlink" href="#retain-count-semantics" title="Permalink to this headline">¶</a></h3>
+<p>A retainable object pointer is either a <span class="arc-term">null pointer</span> or a pointer
+to a valid object. Furthermore, if it has block pointer type and is not
+<tt class="docutils literal"><span class="pre">null</span></tt> then it must actually be a pointer to a block object, and if it has
+<tt class="docutils literal"><span class="pre">Class</span></tt> type (possibly protocol-qualified) then it must actually be a pointer
+to a class object. Otherwise ARC does not enforce the Objective-C type system
+as long as the implementing methods follow the signature of the static type.
+It is undefined behavior if ARC is exposed to an invalid pointer.</p>
+<p>For ARC’s purposes, a valid object is one with “well-behaved” retaining
+operations. Specifically, the object must be laid out such that the
+Objective-C message send machinery can successfully send it the following
+messages:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">retain</span></tt>, taking no arguments and returning a pointer to the object.</li>
+<li><tt class="docutils literal"><span class="pre">release</span></tt>, taking no arguments and returning <tt class="docutils literal"><span class="pre">void</span></tt>.</li>
+<li><tt class="docutils literal"><span class="pre">autorelease</span></tt>, taking no arguments and returning a pointer to the object.</li>
+</ul>
+<p>The behavior of these methods is constrained in the following ways. The term
+<span class="arc-term">high-level semantics</span> is an intentionally vague term; the intent is
+that programmers must implement these methods in a way such that the compiler,
+modifying code in ways it deems safe according to these constraints, will not
+violate their requirements. For example, if the user puts logging statements
+in <tt class="docutils literal"><span class="pre">retain</span></tt>, they should not be surprised if those statements are executed
+more or less often depending on optimization settings. These constraints are
+not exhaustive of the optimization opportunities: values held in local
+variables are subject to additional restrictions, described later in this
+document.</p>
+<p>It is undefined behavior if a computation history featuring a send of
+<tt class="docutils literal"><span class="pre">retain</span></tt> followed by a send of <tt class="docutils literal"><span class="pre">release</span></tt> to the same object, with no
+intervening <tt class="docutils literal"><span class="pre">release</span></tt> on that object, is not equivalent under the high-level
+semantics to a computation history in which these sends are removed. Note that
+this implies that these methods may not raise exceptions.</p>
+<p>It is undefined behavior if a computation history features any use whatsoever
+of an object following the completion of a send of <tt class="docutils literal"><span class="pre">release</span></tt> that is not
+preceded by a send of <tt class="docutils literal"><span class="pre">retain</span></tt> to the same object.</p>
+<p>The behavior of <tt class="docutils literal"><span class="pre">autorelease</span></tt> must be equivalent to sending <tt class="docutils literal"><span class="pre">release</span></tt> when
+one of the autorelease pools currently in scope is popped. It may not throw an
+exception.</p>
+<p>When the semantics call for performing one of these operations on a retainable
+object pointer, if that pointer is <tt class="docutils literal"><span class="pre">null</span></tt> then the effect is a no-op.</p>
+<p>All of the semantics described in this document are subject to additional
+<a class="reference internal" href="#arc-optimization"><em>optimization rules</em></a> which permit the removal or
+optimization of operations based on local knowledge of data flow. The
+semantics describe the high-level behaviors that the compiler implements, not
+an exact sequence of operations that a program will be compiled into.</p>
+</div>
+<div class="section" id="retainable-object-pointers-as-operands-and-arguments">
+<span id="arc-objects-operands"></span><h3><a class="toc-backref" href="#id11">Retainable object pointers as operands and arguments</a><a class="headerlink" href="#retainable-object-pointers-as-operands-and-arguments" title="Permalink to this headline">¶</a></h3>
+<p>In general, ARC does not perform retain or release operations when simply using
+a retainable object pointer as an operand within an expression. This includes:</p>
+<ul class="simple">
+<li>loading a retainable pointer from an object with non-weak <a class="reference internal" href="#arc-ownership"><em>ownership</em></a>,</li>
+<li>passing a retainable pointer as an argument to a function or method, and</li>
+<li>receiving a retainable pointer as the result of a function or method call.</li>
+</ul>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">While this might seem uncontroversial, it is actually unsafe when multiple
+expressions are evaluated in “parallel”, as with binary operators and calls,
+because (for example) one expression might load from an object while another
+writes to it. However, C and C++ already call this undefined behavior
+because the evaluations are unsequenced, and ARC simply exploits that here to
+avoid needing to retain arguments across a large number of calls.</p>
+</div>
+<p>The remainder of this section describes exceptions to these rules, how those
+exceptions are detected, and what those exceptions imply semantically.</p>
+<div class="section" id="consumed-parameters">
+<span id="arc-objects-operands-consumed"></span><h4><a class="toc-backref" href="#id12">Consumed parameters</a><a class="headerlink" href="#consumed-parameters" title="Permalink to this headline">¶</a></h4>
+<p>A function or method parameter of retainable object pointer type may be marked
+as <span class="arc-term">consumed</span>, signifying that the callee expects to take ownership
+of a +1 retain count. This is done by adding the <tt class="docutils literal"><span class="pre">ns_consumed</span></tt> attribute to
+the parameter declaration, like so:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">foo</span><span class="p">(</span><span class="n">__attribute</span><span class="p">((</span><span class="n">ns_consumed</span><span class="p">))</span> <span class="kt">id</span> <span class="n">x</span><span class="p">);</span>
+<span class="k">-</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="nf">foo:</span> <span class="p">(</span><span class="kt">id</span><span class="p">)</span> <span class="n">__attribute</span><span class="p">((</span><span class="n">ns_consumed</span><span class="p">))</span> <span class="n">x</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>This attribute is part of the type of the function or method, not the type of
+the parameter. It controls only how the argument is passed and received.</p>
+<p>When passing such an argument, ARC retains the argument prior to making the
+call.</p>
+<p>When receiving such an argument, ARC releases the argument at the end of the
+function, subject to the usual optimizations for local values.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">This formalizes direct transfers of ownership from a caller to a callee. The
+most common scenario here is passing the <tt class="docutils literal"><span class="pre">self</span></tt> parameter to <tt class="docutils literal"><span class="pre">init</span></tt>, but
+it is useful to generalize. Typically, local optimization will remove any
+extra retains and releases: on the caller side the retain will be merged with
+a +1 source, and on the callee side the release will be rolled into the
+initialization of the parameter.</p>
+</div>
+<p>The implicit <tt class="docutils literal"><span class="pre">self</span></tt> parameter of a method may be marked as consumed by adding
+<tt class="docutils literal"><span class="pre">__attribute__((ns_consumes_self))</span></tt> to the method declaration. Methods in
+the <tt class="docutils literal"><span class="pre">init</span></tt> <a class="reference internal" href="#arc-method-families"><em>family</em></a> are treated as if they were
+implicitly marked with this attribute.</p>
+<p>It is undefined behavior if an Objective-C message send to a method with
+<tt class="docutils literal"><span class="pre">ns_consumed</span></tt> parameters (other than self) is made with a null receiver. It
+is undefined behavior if the method to which an Objective-C message send
+statically resolves to has a different set of <tt class="docutils literal"><span class="pre">ns_consumed</span></tt> parameters than
+the method it dynamically resolves to. It is undefined behavior if a block or
+function call is made through a static type with a different set of
+<tt class="docutils literal"><span class="pre">ns_consumed</span></tt> parameters than the implementation of the called block or
+function.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Consumed parameters with null receiver are a guaranteed leak. Mismatches
+with consumed parameters will cause over-retains or over-releases, depending
+on the direction. The rule about function calls is really just an
+application of the existing C/C++ rule about calling functions through an
+incompatible function type, but it’s useful to state it explicitly.</p>
+</div>
+</div>
+<div class="section" id="retained-return-values">
+<span id="arc-object-operands-retained-return-values"></span><h4><a class="toc-backref" href="#id13">Retained return values</a><a class="headerlink" href="#retained-return-values" title="Permalink to this headline">¶</a></h4>
+<p>A function or method which returns a retainable object pointer type may be
+marked as returning a retained value, signifying that the caller expects to take
+ownership of a +1 retain count. This is done by adding the
+<tt class="docutils literal"><span class="pre">ns_returns_retained</span></tt> attribute to the function or method declaration, like
+so:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">id</span> <span class="nf">foo</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">__attribute</span><span class="p">((</span><span class="n">ns_returns_retained</span><span class="p">));</span>
+<span class="k">-</span> <span class="p">(</span><span class="kt">id</span><span class="p">)</span> <span class="nf">foo</span> <span class="n">__attribute</span><span class="p">((</span><span class="n">ns_returns_retained</span><span class="p">));</span>
+</pre></div>
+</div>
+<p>This attribute is part of the type of the function or method.</p>
+<p>When returning from such a function or method, ARC retains the value at the
+point of evaluation of the return statement, before leaving all local scopes.</p>
+<p>When receiving a return result from such a function or method, ARC releases the
+value at the end of the full-expression it is contained within, subject to the
+usual optimizations for local values.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">This formalizes direct transfers of ownership from a callee to a caller. The
+most common scenario this models is the retained return from <tt class="docutils literal"><span class="pre">init</span></tt>,
+<tt class="docutils literal"><span class="pre">alloc</span></tt>, <tt class="docutils literal"><span class="pre">new</span></tt>, and <tt class="docutils literal"><span class="pre">copy</span></tt> methods, but there are other cases in the
+frameworks. After optimization there are typically no extra retains and
+releases required.</p>
+</div>
+<p>Methods in the <tt class="docutils literal"><span class="pre">alloc</span></tt>, <tt class="docutils literal"><span class="pre">copy</span></tt>, <tt class="docutils literal"><span class="pre">init</span></tt>, <tt class="docutils literal"><span class="pre">mutableCopy</span></tt>, and <tt class="docutils literal"><span class="pre">new</span></tt>
+<a class="reference internal" href="#arc-method-families"><em>families</em></a> are implicitly marked
+<tt class="docutils literal"><span class="pre">__attribute__((ns_returns_retained))</span></tt>. This may be suppressed by explicitly
+marking the method <tt class="docutils literal"><span class="pre">__attribute__((ns_returns_not_retained))</span></tt>.</p>
+<p>It is undefined behavior if the method to which an Objective-C message send
+statically resolves has different retain semantics on its result from the
+method it dynamically resolves to. It is undefined behavior if a block or
+function call is made through a static type with different retain semantics on
+its result from the implementation of the called block or function.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Mismatches with returned results will cause over-retains or over-releases,
+depending on the direction. Again, the rule about function calls is really
+just an application of the existing C/C++ rule about calling functions
+through an incompatible function type.</p>
+</div>
+</div>
+<div class="section" id="unretained-return-values">
+<span id="arc-objects-operands-unretained-returns"></span><h4><a class="toc-backref" href="#id14">Unretained return values</a><a class="headerlink" href="#unretained-return-values" title="Permalink to this headline">¶</a></h4>
+<p>A method or function which returns a retainable object type but does not return
+a retained value must ensure that the object is still valid across the return
+boundary.</p>
+<p>When returning from such a function or method, ARC retains the value at the
+point of evaluation of the return statement, then leaves all local scopes, and
+then balances out the retain while ensuring that the value lives across the
+call boundary. In the worst case, this may involve an <tt class="docutils literal"><span class="pre">autorelease</span></tt>, but
+callers must not assume that the value is actually in the autorelease pool.</p>
+<p>ARC performs no extra mandatory work on the caller side, although it may elect
+to do something to shorten the lifetime of the returned value.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">It is common in non-ARC code to not return an autoreleased value; therefore
+the convention does not force either path. It is convenient to not be
+required to do unnecessary retains and autoreleases; this permits
+optimizations such as eliding retain/autoreleases when it can be shown that
+the original pointer will still be valid at the point of return.</p>
+</div>
+<p>A method or function may be marked with
+<tt class="docutils literal"><span class="pre">__attribute__((ns_returns_autoreleased))</span></tt> to indicate that it returns a
+pointer which is guaranteed to be valid at least as long as the innermost
+autorelease pool. There are no additional semantics enforced in the definition
+of such a method; it merely enables optimizations in callers.</p>
+</div>
+<div class="section" id="bridged-casts">
+<span id="arc-objects-operands-casts"></span><h4><a class="toc-backref" href="#id15">Bridged casts</a><a class="headerlink" href="#bridged-casts" title="Permalink to this headline">¶</a></h4>
+<p>A <span class="arc-term">bridged cast</span> is a C-style cast annotated with one of three
+keywords:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">(__bridge</span> <span class="pre">T)</span> <span class="pre">op</span></tt> casts the operand to the destination type <tt class="docutils literal"><span class="pre">T</span></tt>. If
+<tt class="docutils literal"><span class="pre">T</span></tt> is a retainable object pointer type, then <tt class="docutils literal"><span class="pre">op</span></tt> must have a
+non-retainable pointer type. If <tt class="docutils literal"><span class="pre">T</span></tt> is a non-retainable pointer type,
+then <tt class="docutils literal"><span class="pre">op</span></tt> must have a retainable object pointer type. Otherwise the cast
+is ill-formed. There is no transfer of ownership, and ARC inserts no retain
+operations.</li>
+<li><tt class="docutils literal"><span class="pre">(__bridge_retained</span> <span class="pre">T)</span> <span class="pre">op</span></tt> casts the operand, which must have retainable
+object pointer type, to the destination type, which must be a non-retainable
+pointer type. ARC retains the value, subject to the usual optimizations on
+local values, and the recipient is responsible for balancing that +1.</li>
+<li><tt class="docutils literal"><span class="pre">(__bridge_transfer</span> <span class="pre">T)</span> <span class="pre">op</span></tt> casts the operand, which must have
+non-retainable pointer type, to the destination type, which must be a
+retainable object pointer type. ARC will release the value at the end of
+the enclosing full-expression, subject to the usual optimizations on local
+values.</li>
+</ul>
+<p>These casts are required in order to transfer objects in and out of ARC
+control; see the rationale in the section on <a class="reference internal" href="#arc-objects-restrictions-conversion"><em>conversion of retainable
+object pointers</em></a>.</p>
+<p>Using a <tt class="docutils literal"><span class="pre">__bridge_retained</span></tt> or <tt class="docutils literal"><span class="pre">__bridge_transfer</span></tt> cast purely to convince
+ARC to emit an unbalanced retain or release, respectively, is poor form.</p>
+</div>
+</div>
+<div class="section" id="restrictions">
+<span id="arc-objects-restrictions"></span><h3><a class="toc-backref" href="#id16">Restrictions</a><a class="headerlink" href="#restrictions" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="conversion-of-retainable-object-pointers">
+<span id="arc-objects-restrictions-conversion"></span><h4><a class="toc-backref" href="#id17">Conversion of retainable object pointers</a><a class="headerlink" href="#conversion-of-retainable-object-pointers" title="Permalink to this headline">¶</a></h4>
+<p>In general, a program which attempts to implicitly or explicitly convert a
+value of retainable object pointer type to any non-retainable type, or
+vice-versa, is ill-formed. For example, an Objective-C object pointer shall
+not be converted to <tt class="docutils literal"><span class="pre">void*</span></tt>. As an exception, cast to <tt class="docutils literal"><span class="pre">intptr_t</span></tt> is
+allowed because such casts are not transferring ownership. The <a class="reference internal" href="#arc-objects-operands-casts"><em>bridged
+casts</em></a> may be used to perform these conversions
+where necessary.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">We cannot ensure the correct management of the lifetime of objects if they
+may be freely passed around as unmanaged types. The bridged casts are
+provided so that the programmer may explicitly describe whether the cast
+transfers control into or out of ARC.</p>
+</div>
+<p>However, the following exceptions apply.</p>
+</div>
+<div class="section" id="conversion-to-retainable-object-pointer-type-of-expressions-with-known-semantics">
+<span id="arc-objects-restrictions-conversion-with-known-semantics"></span><h4><a class="toc-backref" href="#id18">Conversion to retainable object pointer type of expressions with known semantics</a><a class="headerlink" href="#conversion-to-retainable-object-pointer-type-of-expressions-with-known-semantics" title="Permalink to this headline">¶</a></h4>
+<p><span class="when-revised">[beginning Apple 4.0, LLVM 3.1]</span>
+<span class="revision">These exceptions have been greatly expanded; they previously applied
+only to a much-reduced subset which is difficult to categorize but which
+included null pointers, message sends (under the given rules), and the various
+global constants.</span></p>
+<p>An unbridged conversion to a retainable object pointer type from a type other
+than a retainable object pointer type is ill-formed, as discussed above, unless
+the operand of the cast has a syntactic form which is known retained, known
+unretained, or known retain-agnostic.</p>
+<p>An expression is <span class="arc-term">known retain-agnostic</span> if it is:</p>
+<ul class="simple">
+<li>an Objective-C string literal,</li>
+<li>a load from a <tt class="docutils literal"><span class="pre">const</span></tt> system global variable of <a class="reference internal" href="#arc-misc-c-retainable"><em>C retainable pointer
+type</em></a>, or</li>
+<li>a null pointer constant.</li>
+</ul>
+<p>An expression is <span class="arc-term">known unretained</span> if it is an rvalue of <a class="reference internal" href="#arc-misc-c-retainable"><em>C
+retainable pointer type</em></a> and it is:</p>
+<ul class="simple">
+<li>a direct call to a function, and either that function has the
+<tt class="docutils literal"><span class="pre">cf_returns_not_retained</span></tt> attribute or it is an <a class="reference internal" href="#arc-misc-c-retainable-audit"><em>audited</em></a> function that does not have the
+<tt class="docutils literal"><span class="pre">cf_returns_retained</span></tt> attribute and does not follow the create/copy naming
+convention,</li>
+<li>a message send, and the declared method either has the
+<tt class="docutils literal"><span class="pre">cf_returns_not_retained</span></tt> attribute or it has neither the
+<tt class="docutils literal"><span class="pre">cf_returns_retained</span></tt> attribute nor a <a class="reference internal" href="#arc-method-families"><em>selector family</em></a> that implies a retained result, or</li>
+<li><span class="when-revised">[beginning LLVM 3.6]</span> <span class="revision">a load from a</span> <tt class="docutils literal"><span class="pre">const</span></tt>
+<span class="revision">non-system global variable.</span></li>
+</ul>
+<p>An expression is <span class="arc-term">known retained</span> if it is an rvalue of <a class="reference internal" href="#arc-misc-c-retainable"><em>C
+retainable pointer type</em></a> and it is:</p>
+<ul class="simple">
+<li>a message send, and the declared method either has the
+<tt class="docutils literal"><span class="pre">cf_returns_retained</span></tt> attribute, or it does not have the
+<tt class="docutils literal"><span class="pre">cf_returns_not_retained</span></tt> attribute but it does have a <a class="reference internal" href="#arc-method-families"><em>selector
+family</em></a> that implies a retained result.</li>
+</ul>
+<p>Furthermore:</p>
+<ul class="simple">
+<li>a comma expression is classified according to its right-hand side,</li>
+<li>a statement expression is classified according to its result expression, if
+it has one,</li>
+<li>an lvalue-to-rvalue conversion applied to an Objective-C property lvalue is
+classified according to the underlying message send, and</li>
+<li>a conditional operator is classified according to its second and third
+operands, if they agree in classification, or else the other if one is known
+retain-agnostic.</li>
+</ul>
+<p>If the cast operand is known retained, the conversion is treated as a
+<tt class="docutils literal"><span class="pre">__bridge_transfer</span></tt> cast. If the cast operand is known unretained or known
+retain-agnostic, the conversion is treated as a <tt class="docutils literal"><span class="pre">__bridge</span></tt> cast.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>Bridging casts are annoying. Absent the ability to completely automate the
+management of CF objects, however, we are left with relatively poor attempts
+to reduce the need for a glut of explicit bridges. Hence these rules.</p>
+<p>We’ve so far consciously refrained from implicitly turning retained CF
+results from function calls into <tt class="docutils literal"><span class="pre">__bridge_transfer</span></tt> casts. The worry is
+that some code patterns — for example, creating a CF value, assigning it
+to an ObjC-typed local, and then calling <tt class="docutils literal"><span class="pre">CFRelease</span></tt> when done — are a
+bit too likely to be accidentally accepted, leading to mysterious behavior.</p>
+<p class="last">For loads from <tt class="docutils literal"><span class="pre">const</span></tt> global variables of <a class="reference internal" href="#arc-misc-c-retainable"><em>C retainable pointer type</em></a>, it is reasonable to assume that global system
+constants were initialitzed with true constants (e.g. string literals), but
+user constants might have been initialized with something dynamically
+allocated, using a global initializer.</p>
+</div>
+</div>
+<div class="section" id="conversion-from-retainable-object-pointer-type-in-certain-contexts">
+<span id="arc-objects-restrictions-conversion-exception-contextual"></span><h4><a class="toc-backref" href="#id19">Conversion from retainable object pointer type in certain contexts</a><a class="headerlink" href="#conversion-from-retainable-object-pointer-type-in-certain-contexts" title="Permalink to this headline">¶</a></h4>
+<p><span class="when-revised">[beginning Apple 4.0, LLVM 3.1]</span></p>
+<p>If an expression of retainable object pointer type is explicitly cast to a
+<a class="reference internal" href="#arc-misc-c-retainable"><em>C retainable pointer type</em></a>, the program is
+ill-formed as discussed above unless the result is immediately used:</p>
+<ul class="simple">
+<li>to initialize a parameter in an Objective-C message send where the parameter
+is not marked with the <tt class="docutils literal"><span class="pre">cf_consumed</span></tt> attribute, or</li>
+<li>to initialize a parameter in a direct call to an
+<a class="reference internal" href="#arc-misc-c-retainable-audit"><em>audited</em></a> function where the parameter is
+not marked with the <tt class="docutils literal"><span class="pre">cf_consumed</span></tt> attribute.</li>
+</ul>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Consumed parameters are left out because ARC would naturally balance them
+with a retain, which was judged too treacherous. This is in part because
+several of the most common consuming functions are in the <tt class="docutils literal"><span class="pre">Release</span></tt> family,
+and it would be quite unfortunate for explicit releases to be silently
+balanced out in this way.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="section" id="ownership-qualification">
+<span id="arc-ownership"></span><h2><a class="toc-backref" href="#id20">Ownership qualification</a><a class="headerlink" href="#ownership-qualification" title="Permalink to this headline">¶</a></h2>
+<p>This section describes the behavior of <em>objects</em> of retainable object pointer
+type; that is, locations in memory which store retainable object pointers.</p>
+<p>A type is a <span class="arc-term">retainable object owner type</span> if it is a retainable
+object pointer type or an array type whose element type is a retainable object
+owner type.</p>
+<p>An <span class="arc-term">ownership qualifier</span> is a type qualifier which applies only to
+retainable object owner types. An array type is ownership-qualified according
+to its element type, and adding an ownership qualifier to an array type so
+qualifies its element type.</p>
+<p>A program is ill-formed if it attempts to apply an ownership qualifier to a
+type which is already ownership-qualified, even if it is the same qualifier.
+There is a single exception to this rule: an ownership qualifier may be applied
+to a substituted template type parameter, which overrides the ownership
+qualifier provided by the template argument.</p>
+<p>When forming a function type, the result type is adjusted so that any
+top-level ownership qualifier is deleted.</p>
+<p>Except as described under the <a class="reference internal" href="#arc-ownership-inference"><em>inference rules</em></a>,
+a program is ill-formed if it attempts to form a pointer or reference type to a
+retainable object owner type which lacks an ownership qualifier.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">These rules, together with the inference rules, ensure that all objects and
+lvalues of retainable object pointer type have an ownership qualifier. The
+ability to override an ownership qualifier during template substitution is
+required to counteract the <a class="reference internal" href="#arc-ownership-inference-template-arguments"><em>inference of __strong for template type
+arguments</em></a>. Ownership qualifiers
+on return types are dropped because they serve no purpose there except to
+cause spurious problems with overloading and templates.</p>
+</div>
+<p>There are four ownership qualifiers:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">__autoreleasing</span></tt></li>
+<li><tt class="docutils literal"><span class="pre">__strong</span></tt></li>
+<li><tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt></li>
+<li><tt class="docutils literal"><span class="pre">__weak</span></tt></li>
+</ul>
+<p>A type is <span class="arc-term">nontrivially ownership-qualified</span> if it is qualified with
+<tt class="docutils literal"><span class="pre">__autoreleasing</span></tt>, <tt class="docutils literal"><span class="pre">__strong</span></tt>, or <tt class="docutils literal"><span class="pre">__weak</span></tt>.</p>
+<div class="section" id="spelling">
+<span id="arc-ownership-spelling"></span><h3><a class="toc-backref" href="#id21">Spelling</a><a class="headerlink" href="#spelling" title="Permalink to this headline">¶</a></h3>
+<p>The names of the ownership qualifiers are reserved for the implementation. A
+program may not assume that they are or are not implemented with macros, or
+what those macros expand to.</p>
+<p>An ownership qualifier may be written anywhere that any other type qualifier
+may be written.</p>
+<p>If an ownership qualifier appears in the <em>declaration-specifiers</em>, the
+following rules apply:</p>
+<ul class="simple">
+<li>if the type specifier is a retainable object owner type, the qualifier
+initially applies to that type;</li>
+<li>otherwise, if the outermost non-array declarator is a pointer
+or block pointer declarator, the qualifier initially applies to
+that type;</li>
+<li>otherwise the program is ill-formed.</li>
+<li>If the qualifier is so applied at a position in the declaration
+where the next-innermost declarator is a function declarator, and
+there is an block declarator within that function declarator, then
+the qualifier applies instead to that block declarator and this rule
+is considered afresh beginning from the new position.</li>
+</ul>
+<p>If an ownership qualifier appears on the declarator name, or on the declared
+object, it is applied to the innermost pointer or block-pointer type.</p>
+<p>If an ownership qualifier appears anywhere else in a declarator, it applies to
+the type there.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Ownership qualifiers are like <tt class="docutils literal"><span class="pre">const</span></tt> and <tt class="docutils literal"><span class="pre">volatile</span></tt> in the sense
+that they may sensibly apply at multiple distinct positions within a
+declarator. However, unlike those qualifiers, there are many
+situations where they are not meaningful, and so we make an effort
+to “move” the qualifier to a place where it will be meaningful. The
+general goal is to allow the programmer to write, say, <tt class="docutils literal"><span class="pre">__strong</span></tt>
+before the entire declaration and have it apply in the leftmost
+sensible place.</p>
+</div>
+<div class="section" id="property-declarations">
+<span id="arc-ownership-spelling-property"></span><h4><a class="toc-backref" href="#id22">Property declarations</a><a class="headerlink" href="#property-declarations" title="Permalink to this headline">¶</a></h4>
+<p>A property of retainable object pointer type may have ownership. If the
+property’s type is ownership-qualified, then the property has that ownership.
+If the property has one of the following modifiers, then the property has the
+corresponding ownership. A property is ill-formed if it has conflicting
+sources of ownership, or if it has redundant ownership modifiers, or if it has
+<tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> ownership.</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">assign</span></tt> implies <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt> ownership.</li>
+<li><tt class="docutils literal"><span class="pre">copy</span></tt> implies <tt class="docutils literal"><span class="pre">__strong</span></tt> ownership, as well as the usual behavior of
+copy semantics on the setter.</li>
+<li><tt class="docutils literal"><span class="pre">retain</span></tt> implies <tt class="docutils literal"><span class="pre">__strong</span></tt> ownership.</li>
+<li><tt class="docutils literal"><span class="pre">strong</span></tt> implies <tt class="docutils literal"><span class="pre">__strong</span></tt> ownership.</li>
+<li><tt class="docutils literal"><span class="pre">unsafe_unretained</span></tt> implies <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt> ownership.</li>
+<li><tt class="docutils literal"><span class="pre">weak</span></tt> implies <tt class="docutils literal"><span class="pre">__weak</span></tt> ownership.</li>
+</ul>
+<p>With the exception of <tt class="docutils literal"><span class="pre">weak</span></tt>, these modifiers are available in non-ARC
+modes.</p>
+<p>A property’s specified ownership is preserved in its metadata, but otherwise
+the meaning is purely conventional unless the property is synthesized. If a
+property is synthesized, then the <span class="arc-term">associated instance variable</span> is
+the instance variable which is named, possibly implicitly, by the
+<tt class="docutils literal"><span class="pre">@synthesize</span></tt> declaration. If the associated instance variable already
+exists, then its ownership qualification must equal the ownership of the
+property; otherwise, the instance variable is created with that ownership
+qualification.</p>
+<p>A property of retainable object pointer type which is synthesized without a
+source of ownership has the ownership of its associated instance variable, if it
+already exists; otherwise, <span class="when-revised">[beginning Apple 3.1, LLVM 3.1]</span>
+<span class="revision">its ownership is implicitly</span> <tt class="docutils literal"><span class="pre">strong</span></tt>. Prior to this revision, it
+was ill-formed to synthesize such a property.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Using <tt class="docutils literal"><span class="pre">strong</span></tt> by default is safe and consistent with the generic ARC rule
+about <a class="reference internal" href="#arc-ownership-inference-variables"><em>inferring ownership</em></a>. It is,
+unfortunately, inconsistent with the non-ARC rule which states that such
+properties are implicitly <tt class="docutils literal"><span class="pre">assign</span></tt>. However, that rule is clearly
+untenable in ARC, since it leads to default-unsafe code. The main merit to
+banning the properties is to avoid confusion with non-ARC practice, which did
+not ultimately strike us as sufficient to justify requiring extra syntax and
+(more importantly) forcing novices to understand ownership rules just to
+declare a property when the default is so reasonable. Changing the rule away
+from non-ARC practice was acceptable because we had conservatively banned the
+synthesis in order to give ourselves exactly this leeway.</p>
+</div>
+<p>Applying <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> to a property not of retainable object
+pointer type has the same behavior it does outside of ARC: it requires the
+property type to be some sort of pointer and permits the use of modifiers other
+than <tt class="docutils literal"><span class="pre">assign</span></tt>. These modifiers only affect the synthesized getter and
+setter; direct accesses to the ivar (even if synthesized) still have primitive
+semantics, and the value in the ivar will not be automatically released during
+deallocation.</p>
+</div>
+</div>
+<div class="section" id="semantics">
+<span id="arc-ownership-semantics"></span><h3><a class="toc-backref" href="#id23">Semantics</a><a class="headerlink" href="#semantics" title="Permalink to this headline">¶</a></h3>
+<p>There are five <span class="arc-term">managed operations</span> which may be performed on an
+object of retainable object pointer type. Each qualifier specifies different
+semantics for each of these operations. It is still undefined behavior to
+access an object outside of its lifetime.</p>
+<p>A load or store with “primitive semantics” has the same semantics as the
+respective operation would have on an <tt class="docutils literal"><span class="pre">void*</span></tt> lvalue with the same alignment
+and non-ownership qualification.</p>
+<p><span class="arc-term">Reading</span> occurs when performing a lvalue-to-rvalue conversion on an
+object lvalue.</p>
+<ul class="simple">
+<li>For <tt class="docutils literal"><span class="pre">__weak</span></tt> objects, the current pointee is retained and then released at
+the end of the current full-expression. This must execute atomically with
+respect to assignments and to the final release of the pointee.</li>
+<li>For all other objects, the lvalue is loaded with primitive semantics.</li>
+</ul>
+<p><span class="arc-term">Assignment</span> occurs when evaluating an assignment operator. The
+semantics vary based on the qualification:</p>
+<ul class="simple">
+<li>For <tt class="docutils literal"><span class="pre">__strong</span></tt> objects, the new pointee is first retained; second, the
+lvalue is loaded with primitive semantics; third, the new pointee is stored
+into the lvalue with primitive semantics; and finally, the old pointee is
+released. This is not performed atomically; external synchronization must be
+used to make this safe in the face of concurrent loads and stores.</li>
+<li>For <tt class="docutils literal"><span class="pre">__weak</span></tt> objects, the lvalue is updated to point to the new pointee,
+unless the new pointee is an object currently undergoing deallocation, in
+which case the lvalue is updated to a null pointer. This must execute
+atomically with respect to other assignments to the object, to reads from the
+object, and to the final release of the new pointee.</li>
+<li>For <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt> objects, the new pointee is stored into the
+lvalue using primitive semantics.</li>
+<li>For <tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> objects, the new pointee is retained, autoreleased,
+and stored into the lvalue using primitive semantics.</li>
+</ul>
+<p><span class="arc-term">Initialization</span> occurs when an object’s lifetime begins, which
+depends on its storage duration. Initialization proceeds in two stages:</p>
+<ol class="arabic simple">
+<li>First, a null pointer is stored into the lvalue using primitive semantics.
+This step is skipped if the object is <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt>.</li>
+<li>Second, if the object has an initializer, that expression is evaluated and
+then assigned into the object using the usual assignment semantics.</li>
+</ol>
+<p><span class="arc-term">Destruction</span> occurs when an object’s lifetime ends. In all cases it
+is semantically equivalent to assigning a null pointer to the object, with the
+proviso that of course the object cannot be legally read after the object’s
+lifetime ends.</p>
+<p><span class="arc-term">Moving</span> occurs in specific situations where an lvalue is “moved
+from”, meaning that its current pointee will be used but the object may be left
+in a different (but still valid) state. This arises with <tt class="docutils literal"><span class="pre">__block</span></tt> variables
+and rvalue references in C++. For <tt class="docutils literal"><span class="pre">__strong</span></tt> lvalues, moving is equivalent
+to loading the lvalue with primitive semantics, writing a null pointer to it
+with primitive semantics, and then releasing the result of the load at the end
+of the current full-expression. For all other lvalues, moving is equivalent to
+reading the object.</p>
+</div>
+<div class="section" id="arc-ownership-restrictions">
+<span id="id1"></span><h3><a class="toc-backref" href="#id24">Restrictions</a><a class="headerlink" href="#arc-ownership-restrictions" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="weak-unavailable-types">
+<span id="arc-ownership-restrictions-weak"></span><h4><a class="toc-backref" href="#id25">Weak-unavailable types</a><a class="headerlink" href="#weak-unavailable-types" title="Permalink to this headline">¶</a></h4>
+<p>It is explicitly permitted for Objective-C classes to not support <tt class="docutils literal"><span class="pre">__weak</span></tt>
+references. It is undefined behavior to perform an operation with weak
+assignment semantics with a pointer to an Objective-C object whose class does
+not support <tt class="docutils literal"><span class="pre">__weak</span></tt> references.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Historically, it has been possible for a class to provide its own
+reference-count implementation by overriding <tt class="docutils literal"><span class="pre">retain</span></tt>, <tt class="docutils literal"><span class="pre">release</span></tt>, etc.
+However, weak references to an object require coordination with its class’s
+reference-count implementation because, among other things, weak loads and
+stores must be atomic with respect to the final release. Therefore, existing
+custom reference-count implementations will generally not support weak
+references without additional effort. This is unavoidable without breaking
+binary compatibility.</p>
+</div>
+<p>A class may indicate that it does not support weak references by providing the
+<tt class="docutils literal"><span class="pre">objc_arc_weak_unavailable</span></tt> attribute on the class’s interface declaration. A
+retainable object pointer type is <strong>weak-unavailable</strong> if
+is a pointer to an (optionally protocol-qualified) Objective-C class <tt class="docutils literal"><span class="pre">T</span></tt> where
+<tt class="docutils literal"><span class="pre">T</span></tt> or one of its superclasses has the <tt class="docutils literal"><span class="pre">objc_arc_weak_unavailable</span></tt>
+attribute. A program is ill-formed if it applies the <tt class="docutils literal"><span class="pre">__weak</span></tt> ownership
+qualifier to a weak-unavailable type or if the value operand of a weak
+assignment operation has a weak-unavailable type.</p>
+</div>
+<div class="section" id="storage-duration-of-autoreleasing-objects">
+<span id="arc-ownership-restrictions-autoreleasing"></span><h4><a class="toc-backref" href="#id26">Storage duration of <tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> objects</a><a class="headerlink" href="#storage-duration-of-autoreleasing-objects" title="Permalink to this headline">¶</a></h4>
+<p>A program is ill-formed if it declares an <tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> object of
+non-automatic storage duration. A program is ill-formed if it captures an
+<tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> object in a block or, unless by reference, in a C++11
+lambda.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Autorelease pools are tied to the current thread and scope by their nature.
+While it is possible to have temporary objects whose instance variables are
+filled with autoreleased objects, there is no way that ARC can provide any
+sort of safety guarantee there.</p>
+</div>
+<p>It is undefined behavior if a non-null pointer is assigned to an
+<tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> object while an autorelease pool is in scope and then that
+object is read after the autorelease pool’s scope is left.</p>
+</div>
+<div class="section" id="conversion-of-pointers-to-ownership-qualified-types">
+<span id="arc-ownership-restrictions-conversion-indirect"></span><h4><a class="toc-backref" href="#id27">Conversion of pointers to ownership-qualified types</a><a class="headerlink" href="#conversion-of-pointers-to-ownership-qualified-types" title="Permalink to this headline">¶</a></h4>
+<p>A program is ill-formed if an expression of type <tt class="docutils literal"><span class="pre">T*</span></tt> is converted,
+explicitly or implicitly, to the type <tt class="docutils literal"><span class="pre">U*</span></tt>, where <tt class="docutils literal"><span class="pre">T</span></tt> and <tt class="docutils literal"><span class="pre">U</span></tt> have
+different ownership qualification, unless:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">T</span></tt> is qualified with <tt class="docutils literal"><span class="pre">__strong</span></tt>, <tt class="docutils literal"><span class="pre">__autoreleasing</span></tt>, or
+<tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt>, and <tt class="docutils literal"><span class="pre">U</span></tt> is qualified with both <tt class="docutils literal"><span class="pre">const</span></tt> and
+<tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt>; or</li>
+<li>either <tt class="docutils literal"><span class="pre">T</span></tt> or <tt class="docutils literal"><span class="pre">U</span></tt> is <tt class="docutils literal"><span class="pre">cv</span> <span class="pre">void</span></tt>, where <tt class="docutils literal"><span class="pre">cv</span></tt> is an optional sequence
+of non-ownership qualifiers; or</li>
+<li>the conversion is requested with a <tt class="docutils literal"><span class="pre">reinterpret_cast</span></tt> in Objective-C++; or</li>
+<li>the conversion is a well-formed <a class="reference internal" href="#arc-ownership-restrictions-pass-by-writeback"><em>pass-by-writeback</em></a>.</li>
+</ul>
+<p>The analogous rule applies to <tt class="docutils literal"><span class="pre">T&</span></tt> and <tt class="docutils literal"><span class="pre">U&</span></tt> in Objective-C++.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">These rules provide a reasonable level of type-safety for indirect pointers,
+as long as the underlying memory is not deallocated. The conversion to
+<tt class="docutils literal"><span class="pre">const</span> <span class="pre">__unsafe_unretained</span></tt> is permitted because the semantics of reads are
+equivalent across all these ownership semantics, and that’s a very useful and
+common pattern. The interconversion with <tt class="docutils literal"><span class="pre">void*</span></tt> is useful for allocating
+memory or otherwise escaping the type system, but use it carefully.
+<tt class="docutils literal"><span class="pre">reinterpret_cast</span></tt> is considered to be an obvious enough sign of taking
+responsibility for any problems.</p>
+</div>
+<p>It is undefined behavior to access an ownership-qualified object through an
+lvalue of a differently-qualified type, except that any non-<tt class="docutils literal"><span class="pre">__weak</span></tt> object
+may be read through an <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt> lvalue.</p>
+<p>It is undefined behavior if a managed operation is performed on a <tt class="docutils literal"><span class="pre">__strong</span></tt>
+or <tt class="docutils literal"><span class="pre">__weak</span></tt> object without a guarantee that it contains a primitive zero
+bit-pattern, or if the storage for such an object is freed or reused without the
+object being first assigned a null pointer.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">ARC cannot differentiate between an assignment operator which is intended to
+“initialize” dynamic memory and one which is intended to potentially replace
+a value. Therefore the object’s pointer must be valid before letting ARC at
+it. Similarly, C and Objective-C do not provide any language hooks for
+destroying objects held in dynamic memory, so it is the programmer’s
+responsibility to avoid leaks (<tt class="docutils literal"><span class="pre">__strong</span></tt> objects) and consistency errors
+(<tt class="docutils literal"><span class="pre">__weak</span></tt> objects).</p>
+</div>
+<p>These requirements are followed automatically in Objective-C++ when creating
+objects of retainable object owner type with <tt class="docutils literal"><span class="pre">new</span></tt> or <tt class="docutils literal"><span class="pre">new[]</span></tt> and destroying
+them with <tt class="docutils literal"><span class="pre">delete</span></tt>, <tt class="docutils literal"><span class="pre">delete[]</span></tt>, or a pseudo-destructor expression. Note
+that arrays of nontrivially-ownership-qualified type are not ABI compatible with
+non-ARC code because the element type is non-POD: such arrays that are
+<tt class="docutils literal"><span class="pre">new[]</span></tt>‘d in ARC translation units cannot be <tt class="docutils literal"><span class="pre">delete[]</span></tt>‘d in non-ARC
+translation units and vice-versa.</p>
+</div>
+<div class="section" id="passing-to-an-out-parameter-by-writeback">
+<span id="arc-ownership-restrictions-pass-by-writeback"></span><h4><a class="toc-backref" href="#id28">Passing to an out parameter by writeback</a><a class="headerlink" href="#passing-to-an-out-parameter-by-writeback" title="Permalink to this headline">¶</a></h4>
+<p>If the argument passed to a parameter of type <tt class="docutils literal"><span class="pre">T</span> <span class="pre">__autoreleasing</span> <span class="pre">*</span></tt> has type
+<tt class="docutils literal"><span class="pre">U</span> <span class="pre">oq</span> <span class="pre">*</span></tt>, where <tt class="docutils literal"><span class="pre">oq</span></tt> is an ownership qualifier, then the argument is a
+candidate for <span class="arc-term">pass-by-writeback`</span> if:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">oq</span></tt> is <tt class="docutils literal"><span class="pre">__strong</span></tt> or <tt class="docutils literal"><span class="pre">__weak</span></tt>, and</li>
+<li>it would be legal to initialize a <tt class="docutils literal"><span class="pre">T</span> <span class="pre">__strong</span> <span class="pre">*</span></tt> with a <tt class="docutils literal"><span class="pre">U</span> <span class="pre">__strong</span> <span class="pre">*</span></tt>.</li>
+</ul>
+<p>For purposes of overload resolution, an implicit conversion sequence requiring
+a pass-by-writeback is always worse than an implicit conversion sequence not
+requiring a pass-by-writeback.</p>
+<p>The pass-by-writeback is ill-formed if the argument expression does not have a
+legal form:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">&var</span></tt>, where <tt class="docutils literal"><span class="pre">var</span></tt> is a scalar variable of automatic storage duration
+with retainable object pointer type</li>
+<li>a conditional expression where the second and third operands are both legal
+forms</li>
+<li>a cast whose operand is a legal form</li>
+<li>a null pointer constant</li>
+</ul>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">The restriction in the form of the argument serves two purposes. First, it
+makes it impossible to pass the address of an array to the argument, which
+serves to protect against an otherwise serious risk of mis-inferring an
+“array” argument as an out-parameter. Second, it makes it much less likely
+that the user will see confusing aliasing problems due to the implementation,
+below, where their store to the writeback temporary is not immediately seen
+in the original argument variable.</p>
+</div>
+<p>A pass-by-writeback is evaluated as follows:</p>
+<ol class="arabic simple">
+<li>The argument is evaluated to yield a pointer <tt class="docutils literal"><span class="pre">p</span></tt> of type <tt class="docutils literal"><span class="pre">U</span> <span class="pre">oq</span> <span class="pre">*</span></tt>.</li>
+<li>If <tt class="docutils literal"><span class="pre">p</span></tt> is a null pointer, then a null pointer is passed as the argument,
+and no further work is required for the pass-by-writeback.</li>
+<li>Otherwise, a temporary of type <tt class="docutils literal"><span class="pre">T</span> <span class="pre">__autoreleasing</span></tt> is created and
+initialized to a null pointer.</li>
+<li>If the parameter is not an Objective-C method parameter marked <tt class="docutils literal"><span class="pre">out</span></tt>,
+then <tt class="docutils literal"><span class="pre">*p</span></tt> is read, and the result is written into the temporary with
+primitive semantics.</li>
+<li>The address of the temporary is passed as the argument to the actual call.</li>
+<li>After the call completes, the temporary is loaded with primitive
+semantics, and that value is assigned into <tt class="docutils literal"><span class="pre">*p</span></tt>.</li>
+</ol>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">This is all admittedly convoluted. In an ideal world, we would see that a
+local variable is being passed to an out-parameter and retroactively modify
+its type to be <tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> rather than <tt class="docutils literal"><span class="pre">__strong</span></tt>. This would be
+remarkably difficult and not always well-founded under the C type system.
+However, it was judged unacceptably invasive to require programmers to write
+<tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> on all the variables they intend to use for
+out-parameters. This was the least bad solution.</p>
+</div>
+</div>
+<div class="section" id="ownership-qualified-fields-of-structs-and-unions">
+<span id="arc-ownership-restrictions-records"></span><h4><a class="toc-backref" href="#id29">Ownership-qualified fields of structs and unions</a><a class="headerlink" href="#ownership-qualified-fields-of-structs-and-unions" title="Permalink to this headline">¶</a></h4>
+<p>A program is ill-formed if it declares a member of a C struct or union to have
+a nontrivially ownership-qualified type.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">The resulting type would be non-POD in the C++ sense, but C does not give us
+very good language tools for managing the lifetime of aggregates, so it is
+more convenient to simply forbid them. It is still possible to manage this
+with a <tt class="docutils literal"><span class="pre">void*</span></tt> or an <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt> object.</p>
+</div>
+<p>This restriction does not apply in Objective-C++. However, nontrivally
+ownership-qualified types are considered non-POD: in C++11 terms, they are not
+trivially default constructible, copy constructible, move constructible, copy
+assignable, move assignable, or destructible. It is a violation of C++’s One
+Definition Rule to use a class outside of ARC that, under ARC, would have a
+nontrivially ownership-qualified member.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Unlike in C, we can express all the necessary ARC semantics for
+ownership-qualified subobjects as suboperations of the (default) special
+member functions for the class. These functions then become non-trivial.
+This has the non-obvious result that the class will have a non-trivial copy
+constructor and non-trivial destructor; if this would not normally be true
+outside of ARC, objects of the type will be passed and returned in an
+ABI-incompatible manner.</p>
+</div>
+</div>
+</div>
+<div class="section" id="ownership-inference">
+<span id="arc-ownership-inference"></span><h3><a class="toc-backref" href="#id30">Ownership inference</a><a class="headerlink" href="#ownership-inference" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="objects">
+<span id="arc-ownership-inference-variables"></span><h4><a class="toc-backref" href="#id31">Objects</a><a class="headerlink" href="#objects" title="Permalink to this headline">¶</a></h4>
+<p>If an object is declared with retainable object owner type, but without an
+explicit ownership qualifier, its type is implicitly adjusted to have
+<tt class="docutils literal"><span class="pre">__strong</span></tt> qualification.</p>
+<p>As a special case, if the object’s base type is <tt class="docutils literal"><span class="pre">Class</span></tt> (possibly
+protocol-qualified), the type is adjusted to have <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt>
+qualification instead.</p>
+</div>
+<div class="section" id="indirect-parameters">
+<span id="arc-ownership-inference-indirect-parameters"></span><h4><a class="toc-backref" href="#id32">Indirect parameters</a><a class="headerlink" href="#indirect-parameters" title="Permalink to this headline">¶</a></h4>
+<p>If a function or method parameter has type <tt class="docutils literal"><span class="pre">T*</span></tt>, where <tt class="docutils literal"><span class="pre">T</span></tt> is an
+ownership-unqualified retainable object pointer type, then:</p>
+<ul class="simple">
+<li>if <tt class="docutils literal"><span class="pre">T</span></tt> is <tt class="docutils literal"><span class="pre">const</span></tt>-qualified or <tt class="docutils literal"><span class="pre">Class</span></tt>, then it is implicitly
+qualified with <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt>;</li>
+<li>otherwise, it is implicitly qualified with <tt class="docutils literal"><span class="pre">__autoreleasing</span></tt>.</li>
+</ul>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last"><tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> exists mostly for this case, the Cocoa convention for
+out-parameters. Since a pointer to <tt class="docutils literal"><span class="pre">const</span></tt> is obviously not an
+out-parameter, we instead use a type more useful for passing arrays. If the
+user instead intends to pass in a <em>mutable</em> array, inferring
+<tt class="docutils literal"><span class="pre">__autoreleasing</span></tt> is the wrong thing to do; this directs some of the
+caution in the following rules about writeback.</p>
+</div>
+<p>Such a type written anywhere else would be ill-formed by the general rule
+requiring ownership qualifiers.</p>
+<p>This rule does not apply in Objective-C++ if a parameter’s type is dependent in
+a template pattern and is only <em>instantiated</em> to a type which would be a
+pointer to an unqualified retainable object pointer type. Such code is still
+ill-formed.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">The convention is very unlikely to be intentional in template code.</p>
+</div>
+</div>
+<div class="section" id="template-arguments">
+<span id="arc-ownership-inference-template-arguments"></span><h4><a class="toc-backref" href="#id33">Template arguments</a><a class="headerlink" href="#template-arguments" title="Permalink to this headline">¶</a></h4>
+<p>If a template argument for a template type parameter is an retainable object
+owner type that does not have an explicit ownership qualifier, it is adjusted
+to have <tt class="docutils literal"><span class="pre">__strong</span></tt> qualification. This adjustment occurs regardless of
+whether the template argument was deduced or explicitly specified.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last"><tt class="docutils literal"><span class="pre">__strong</span></tt> is a useful default for containers (e.g., <tt class="docutils literal"><span class="pre">std::vector<id></span></tt>),
+which would otherwise require explicit qualification. Moreover, unqualified
+retainable object pointer types are unlikely to be useful within templates,
+since they generally need to have a qualifier applied to the before being
+used.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="section" id="method-families">
+<span id="arc-method-families"></span><h2><a class="toc-backref" href="#id34">Method families</a><a class="headerlink" href="#method-families" title="Permalink to this headline">¶</a></h2>
+<p>An Objective-C method may fall into a <span class="arc-term">method family</span>, which is a
+conventional set of behaviors ascribed to it by the Cocoa conventions.</p>
+<p>A method is in a certain method family if:</p>
+<ul class="simple">
+<li>it has a <tt class="docutils literal"><span class="pre">objc_method_family</span></tt> attribute placing it in that family; or if
+not that,</li>
+<li>it does not have an <tt class="docutils literal"><span class="pre">objc_method_family</span></tt> attribute placing it in a
+different or no family, and</li>
+<li>its selector falls into the corresponding selector family, and</li>
+<li>its signature obeys the added restrictions of the method family.</li>
+</ul>
+<p>A selector is in a certain selector family if, ignoring any leading
+underscores, the first component of the selector either consists entirely of
+the name of the method family or it begins with that name followed by a
+character other than a lowercase letter. For example, <tt class="docutils literal"><span class="pre">_perform:with:</span></tt> and
+<tt class="docutils literal"><span class="pre">performWith:</span></tt> would fall into the <tt class="docutils literal"><span class="pre">perform</span></tt> family (if we recognized one),
+but <tt class="docutils literal"><span class="pre">performing:with</span></tt> would not.</p>
+<p>The families and their added restrictions are:</p>
+<ul>
+<li><p class="first"><tt class="docutils literal"><span class="pre">alloc</span></tt> methods must return a retainable object pointer type.</p>
+</li>
+<li><p class="first"><tt class="docutils literal"><span class="pre">copy</span></tt> methods must return a retainable object pointer type.</p>
+</li>
+<li><p class="first"><tt class="docutils literal"><span class="pre">mutableCopy</span></tt> methods must return a retainable object pointer type.</p>
+</li>
+<li><p class="first"><tt class="docutils literal"><span class="pre">new</span></tt> methods must return a retainable object pointer type.</p>
+</li>
+<li><p class="first"><tt class="docutils literal"><span class="pre">init</span></tt> methods must be instance methods and must return an Objective-C
+pointer type. Additionally, a program is ill-formed if it declares or
+contains a call to an <tt class="docutils literal"><span class="pre">init</span></tt> method whose return type is neither <tt class="docutils literal"><span class="pre">id</span></tt> nor
+a pointer to a super-class or sub-class of the declaring class (if the method
+was declared on a class) or the static receiver type of the call (if it was
+declared on a protocol).</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>There are a fair number of existing methods with <tt class="docutils literal"><span class="pre">init</span></tt>-like selectors
+which nonetheless don’t follow the <tt class="docutils literal"><span class="pre">init</span></tt> conventions. Typically these
+are either accidental naming collisions or helper methods called during
+initialization. Because of the peculiar retain/release behavior of
+<tt class="docutils literal"><span class="pre">init</span></tt> methods, it’s very important not to treat these methods as
+<tt class="docutils literal"><span class="pre">init</span></tt> methods if they aren’t meant to be. It was felt that implicitly
+defining these methods out of the family based on the exact relationship
+between the return type and the declaring class would be much too subtle
+and fragile. Therefore we identify a small number of legitimate-seeming
+return types and call everything else an error. This serves the secondary
+purpose of encouraging programmers not to accidentally give methods names
+in the <tt class="docutils literal"><span class="pre">init</span></tt> family.</p>
+<p class="last">Note that a method with an <tt class="docutils literal"><span class="pre">init</span></tt>-family selector which returns a
+non-Objective-C type (e.g. <tt class="docutils literal"><span class="pre">void</span></tt>) is perfectly well-formed; it simply
+isn’t in the <tt class="docutils literal"><span class="pre">init</span></tt> family.</p>
+</div>
+</li>
+</ul>
+<p>A program is ill-formed if a method’s declarations, implementations, and
+overrides do not all have the same method family.</p>
+<div class="section" id="explicit-method-family-control">
+<span id="arc-family-attribute"></span><h3><a class="toc-backref" href="#id35">Explicit method family control</a><a class="headerlink" href="#explicit-method-family-control" title="Permalink to this headline">¶</a></h3>
+<p>A method may be annotated with the <tt class="docutils literal"><span class="pre">objc_method_family</span></tt> attribute to
+precisely control which method family it belongs to. If a method in an
+<tt class="docutils literal"><span class="pre">@implementation</span></tt> does not have this attribute, but there is a method
+declared in the corresponding <tt class="docutils literal"><span class="pre">@interface</span></tt> that does, then the attribute is
+copied to the declaration in the <tt class="docutils literal"><span class="pre">@implementation</span></tt>. The attribute is
+available outside of ARC, and may be tested for with the preprocessor query
+<tt class="docutils literal"><span class="pre">__has_attribute(objc_method_family)</span></tt>.</p>
+<p>The attribute is spelled
+<tt class="docutils literal"><span class="pre">__attribute__((objc_method_family(</span></tt> <em>family</em> <tt class="docutils literal"><span class="pre">)))</span></tt>. If <em>family</em> is
+<tt class="docutils literal"><span class="pre">none</span></tt>, the method has no family, even if it would otherwise be considered to
+have one based on its selector and type. Otherwise, <em>family</em> must be one of
+<tt class="docutils literal"><span class="pre">alloc</span></tt>, <tt class="docutils literal"><span class="pre">copy</span></tt>, <tt class="docutils literal"><span class="pre">init</span></tt>, <tt class="docutils literal"><span class="pre">mutableCopy</span></tt>, or <tt class="docutils literal"><span class="pre">new</span></tt>, in which case the
+method is considered to belong to the corresponding family regardless of its
+selector. It is an error if a method that is explicitly added to a family in
+this way does not meet the requirements of the family other than the selector
+naming convention.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">The rules codified in this document describe the standard conventions of
+Objective-C. However, as these conventions have not heretofore been enforced
+by an unforgiving mechanical system, they are only imperfectly kept,
+especially as they haven’t always even been precisely defined. While it is
+possible to define low-level ownership semantics with attributes like
+<tt class="docutils literal"><span class="pre">ns_returns_retained</span></tt>, this attribute allows the user to communicate
+semantic intent, which is of use both to ARC (which, e.g., treats calls to
+<tt class="docutils literal"><span class="pre">init</span></tt> specially) and the static analyzer.</p>
+</div>
+</div>
+<div class="section" id="semantics-of-method-families">
+<span id="arc-family-semantics"></span><h3><a class="toc-backref" href="#id36">Semantics of method families</a><a class="headerlink" href="#semantics-of-method-families" title="Permalink to this headline">¶</a></h3>
+<p>A method’s membership in a method family may imply non-standard semantics for
+its parameters and return type.</p>
+<p>Methods in the <tt class="docutils literal"><span class="pre">alloc</span></tt>, <tt class="docutils literal"><span class="pre">copy</span></tt>, <tt class="docutils literal"><span class="pre">mutableCopy</span></tt>, and <tt class="docutils literal"><span class="pre">new</span></tt> families —
+that is, methods in all the currently-defined families except <tt class="docutils literal"><span class="pre">init</span></tt> —
+implicitly <a class="reference internal" href="#arc-object-operands-retained-return-values"><em>return a retained object</em></a> as if they were annotated with
+the <tt class="docutils literal"><span class="pre">ns_returns_retained</span></tt> attribute. This can be overridden by annotating
+the method with either of the <tt class="docutils literal"><span class="pre">ns_returns_autoreleased</span></tt> or
+<tt class="docutils literal"><span class="pre">ns_returns_not_retained</span></tt> attributes.</p>
+<p>Properties also follow same naming rules as methods. This means that those in
+the <tt class="docutils literal"><span class="pre">alloc</span></tt>, <tt class="docutils literal"><span class="pre">copy</span></tt>, <tt class="docutils literal"><span class="pre">mutableCopy</span></tt>, and <tt class="docutils literal"><span class="pre">new</span></tt> families provide access
+to <a class="reference internal" href="#arc-object-operands-retained-return-values"><em>retained objects</em></a>. This
+can be overridden by annotating the property with <tt class="docutils literal"><span class="pre">ns_returns_not_retained</span></tt>
+attribute.</p>
+<div class="section" id="semantics-of-init">
+<span id="arc-family-semantics-init"></span><h4><a class="toc-backref" href="#id37">Semantics of <tt class="docutils literal"><span class="pre">init</span></tt></a><a class="headerlink" href="#semantics-of-init" title="Permalink to this headline">¶</a></h4>
+<p>Methods in the <tt class="docutils literal"><span class="pre">init</span></tt> family implicitly <a class="reference internal" href="#arc-objects-operands-consumed"><em>consume</em></a> their <tt class="docutils literal"><span class="pre">self</span></tt> parameter and <a class="reference internal" href="#arc-object-operands-retained-return-values"><em>return a
+retained object</em></a>. Neither of
+these properties can be altered through attributes.</p>
+<p>A call to an <tt class="docutils literal"><span class="pre">init</span></tt> method with a receiver that is either <tt class="docutils literal"><span class="pre">self</span></tt> (possibly
+parenthesized or casted) or <tt class="docutils literal"><span class="pre">super</span></tt> is called a <span class="arc-term">delegate init
+call</span>. It is an error for a delegate init call to be made except from an
+<tt class="docutils literal"><span class="pre">init</span></tt> method, and excluding blocks within such methods.</p>
+<p>As an exception to the <a class="reference internal" href="#arc-misc-self"><em>usual rule</em></a>, the variable <tt class="docutils literal"><span class="pre">self</span></tt>
+is mutable in an <tt class="docutils literal"><span class="pre">init</span></tt> method and has the usual semantics for a <tt class="docutils literal"><span class="pre">__strong</span></tt>
+variable. However, it is undefined behavior and the program is ill-formed, no
+diagnostic required, if an <tt class="docutils literal"><span class="pre">init</span></tt> method attempts to use the previous value
+of <tt class="docutils literal"><span class="pre">self</span></tt> after the completion of a delegate init call. It is conventional,
+but not required, for an <tt class="docutils literal"><span class="pre">init</span></tt> method to return <tt class="docutils literal"><span class="pre">self</span></tt>.</p>
+<p>It is undefined behavior for a program to cause two or more calls to <tt class="docutils literal"><span class="pre">init</span></tt>
+methods on the same object, except that each <tt class="docutils literal"><span class="pre">init</span></tt> method invocation may
+perform at most one delegate init call.</p>
+</div>
+<div class="section" id="related-result-types">
+<span id="arc-family-semantics-result-type"></span><h4><a class="toc-backref" href="#id38">Related result types</a><a class="headerlink" href="#related-result-types" title="Permalink to this headline">¶</a></h4>
+<p>Certain methods are candidates to have <span class="arc-term">related result types</span>:</p>
+<ul class="simple">
+<li>class methods in the <tt class="docutils literal"><span class="pre">alloc</span></tt> and <tt class="docutils literal"><span class="pre">new</span></tt> method families</li>
+<li>instance methods in the <tt class="docutils literal"><span class="pre">init</span></tt> family</li>
+<li>the instance method <tt class="docutils literal"><span class="pre">self</span></tt></li>
+<li>outside of ARC, the instance methods <tt class="docutils literal"><span class="pre">retain</span></tt> and <tt class="docutils literal"><span class="pre">autorelease</span></tt></li>
+</ul>
+<p>If the formal result type of such a method is <tt class="docutils literal"><span class="pre">id</span></tt> or protocol-qualified
+<tt class="docutils literal"><span class="pre">id</span></tt>, or a type equal to the declaring class or a superclass, then it is said
+to have a related result type. In this case, when invoked in an explicit
+message send, it is assumed to return a type related to the type of the
+receiver:</p>
+<ul class="simple">
+<li>if it is a class method, and the receiver is a class name <tt class="docutils literal"><span class="pre">T</span></tt>, the message
+send expression has type <tt class="docutils literal"><span class="pre">T*</span></tt>; otherwise</li>
+<li>if it is an instance method, and the receiver has type <tt class="docutils literal"><span class="pre">T</span></tt>, the message
+send expression has type <tt class="docutils literal"><span class="pre">T</span></tt>; otherwise</li>
+<li>the message send expression has the normal result type of the method.</li>
+</ul>
+<p>This is a new rule of the Objective-C language and applies outside of ARC.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">ARC’s automatic code emission is more prone than most code to signature
+errors, i.e. errors where a call was emitted against one method signature,
+but the implementing method has an incompatible signature. Having more
+precise type information helps drastically lower this risk, as well as
+catching a number of latent bugs.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="section" id="optimization">
+<span id="arc-optimization"></span><h2><a class="toc-backref" href="#id39">Optimization</a><a class="headerlink" href="#optimization" title="Permalink to this headline">¶</a></h2>
+<p>Within this section, the word <span class="arc-term">function</span> will be used to
+refer to any structured unit of code, be it a C function, an
+Objective-C method, or a block.</p>
+<p>This specification describes ARC as performing specific <tt class="docutils literal"><span class="pre">retain</span></tt> and
+<tt class="docutils literal"><span class="pre">release</span></tt> operations on retainable object pointers at specific
+points during the execution of a program. These operations make up a
+non-contiguous subsequence of the computation history of the program.
+The portion of this sequence for a particular retainable object
+pointer for which a specific function execution is directly
+responsible is the <span class="arc-term">formal local retain history</span> of the
+object pointer. The corresponding actual sequence executed is the
+<cite>dynamic local retain history</cite>.</p>
+<p>However, under certain circumstances, ARC is permitted to re-order and
+eliminate operations in a manner which may alter the overall
+computation history beyond what is permitted by the general “as if”
+rule of C/C++ and the <a class="reference internal" href="#arc-objects-retains"><em>restrictions</em></a> on
+the implementation of <tt class="docutils literal"><span class="pre">retain</span></tt> and <tt class="docutils literal"><span class="pre">release</span></tt>.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>Specifically, ARC is sometimes permitted to optimize <tt class="docutils literal"><span class="pre">release</span></tt>
+operations in ways which might cause an object to be deallocated
+before it would otherwise be. Without this, it would be almost
+impossible to eliminate any <tt class="docutils literal"><span class="pre">retain</span></tt>/<tt class="docutils literal"><span class="pre">release</span></tt> pairs. For
+example, consider the following code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">id</span> <span class="n">x</span> <span class="o">=</span> <span class="n">_ivar</span><span class="p">;</span>
+<span class="p">[</span><span class="n">x</span> <span class="n">foo</span><span class="p">];</span>
+</pre></div>
+</div>
+<p class="last">If we were not permitted in any event to shorten the lifetime of the
+object in <tt class="docutils literal"><span class="pre">x</span></tt>, then we would not be able to eliminate this retain
+and release unless we could prove that the message send could not
+modify <tt class="docutils literal"><span class="pre">_ivar</span></tt> (or deallocate <tt class="docutils literal"><span class="pre">self</span></tt>). Since message sends are
+opaque to the optimizer, this is not possible, and so ARC’s hands
+would be almost completely tied.</p>
+</div>
+<p>ARC makes no guarantees about the execution of a computation history
+which contains undefined behavior. In particular, ARC makes no
+guarantees in the presence of race conditions.</p>
+<p>ARC may assume that any retainable object pointers it receives or
+generates are instantaneously valid from that point until a point
+which, by the concurrency model of the host language, happens-after
+the generation of the pointer and happens-before a release of that
+object (possibly via an aliasing pointer or indirectly due to
+destruction of a different object).</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">There is very little point in trying to guarantee correctness in the
+presence of race conditions. ARC does not have a stack-scanning
+garbage collector, and guaranteeing the atomicity of every load and
+store operation would be prohibitive and preclude a vast amount of
+optimization.</p>
+</div>
+<p>ARC may assume that non-ARC code engages in sensible balancing
+behavior and does not rely on exact or minimum retain count values
+except as guaranteed by <tt class="docutils literal"><span class="pre">__strong</span></tt> object invariants or +1 transfer
+conventions. For example, if an object is provably double-retained
+and double-released, ARC may eliminate the inner retain and release;
+it does not need to guard against code which performs an unbalanced
+release followed by a “balancing” retain.</p>
+<div class="section" id="object-liveness">
+<span id="arc-optimization-liveness"></span><h3><a class="toc-backref" href="#id40">Object liveness</a><a class="headerlink" href="#object-liveness" title="Permalink to this headline">¶</a></h3>
+<p>ARC may not allow a retainable object <tt class="docutils literal"><span class="pre">X</span></tt> to be deallocated at a
+time <tt class="docutils literal"><span class="pre">T</span></tt> in a computation history if:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">X</span></tt> is the value stored in a <tt class="docutils literal"><span class="pre">__strong</span></tt> object <tt class="docutils literal"><span class="pre">S</span></tt> with
+<a class="reference internal" href="#arc-optimization-precise"><em>precise lifetime semantics</em></a>, or</li>
+<li><tt class="docutils literal"><span class="pre">X</span></tt> is the value stored in a <tt class="docutils literal"><span class="pre">__strong</span></tt> object <tt class="docutils literal"><span class="pre">S</span></tt> with
+imprecise lifetime semantics and, at some point after <tt class="docutils literal"><span class="pre">T</span></tt> but
+before the next store to <tt class="docutils literal"><span class="pre">S</span></tt>, the computation history features a
+load from <tt class="docutils literal"><span class="pre">S</span></tt> and in some way depends on the value loaded, or</li>
+<li><tt class="docutils literal"><span class="pre">X</span></tt> is a value described as being released at the end of the
+current full-expression and, at some point after <tt class="docutils literal"><span class="pre">T</span></tt> but before
+the end of the full-expression, the computation history depends
+on that value.</li>
+</ul>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>The intent of the second rule is to say that objects held in normal
+<tt class="docutils literal"><span class="pre">__strong</span></tt> local variables may be released as soon as the value in
+the variable is no longer being used: either the variable stops
+being used completely or a new value is stored in the variable.</p>
+<p class="last">The intent of the third rule is to say that return values may be
+released after they’ve been used.</p>
+</div>
+<p>A computation history depends on a pointer value <tt class="docutils literal"><span class="pre">P</span></tt> if it:</p>
+<ul class="simple">
+<li>performs a pointer comparison with <tt class="docutils literal"><span class="pre">P</span></tt>,</li>
+<li>loads from <tt class="docutils literal"><span class="pre">P</span></tt>,</li>
+<li>stores to <tt class="docutils literal"><span class="pre">P</span></tt>,</li>
+<li>depends on a pointer value <tt class="docutils literal"><span class="pre">Q</span></tt> derived via pointer arithmetic
+from <tt class="docutils literal"><span class="pre">P</span></tt> (including an instance-variable or field access), or</li>
+<li>depends on a pointer value <tt class="docutils literal"><span class="pre">Q</span></tt> loaded from <tt class="docutils literal"><span class="pre">P</span></tt>.</li>
+</ul>
+<p>Dependency applies only to values derived directly or indirectly from
+a particular expression result and does not occur merely because a
+separate pointer value dynamically aliases <tt class="docutils literal"><span class="pre">P</span></tt>. Furthermore, this
+dependency is not carried by values that are stored to objects.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>The restrictions on dependency are intended to make this analysis
+feasible by an optimizer with only incomplete information about a
+program. Essentially, dependence is carried to “obvious” uses of a
+pointer. Merely passing a pointer argument to a function does not
+itself cause dependence, but since generally the optimizer will not
+be able to prove that the function doesn’t depend on that parameter,
+it will be forced to conservatively assume it does.</p>
+<p>Dependency propagates to values loaded from a pointer because those
+values might be invalidated by deallocating the object. For
+example, given the code <tt class="docutils literal"><span class="pre">__strong</span> <span class="pre">id</span> <span class="pre">x</span> <span class="pre">=</span> <span class="pre">p->ivar;</span></tt>, ARC must not
+move the release of <tt class="docutils literal"><span class="pre">p</span></tt> to between the load of <tt class="docutils literal"><span class="pre">p->ivar</span></tt> and the
+retain of that value for storing into <tt class="docutils literal"><span class="pre">x</span></tt>.</p>
+<p>Dependency does not propagate through stores of dependent pointer
+values because doing so would allow dependency to outlive the
+full-expression which produced the original value. For example, the
+address of an instance variable could be written to some global
+location and then freely accessed during the lifetime of the local,
+or a function could return an inner pointer of an object and store
+it to a local. These cases would be potentially impossible to
+reason about and so would basically prevent any optimizations based
+on imprecise lifetime. There are also uncommon enough to make it
+reasonable to require the precise-lifetime annotation if someone
+really wants to rely on them.</p>
+<p class="last">Dependency does propagate through return values of pointer type.
+The compelling source of need for this rule is a property accessor
+which returns an un-autoreleased result; the calling function must
+have the chance to operate on the value, e.g. to retain it, before
+ARC releases the original pointer. Note again, however, that
+dependence does not survive a store, so ARC does not guarantee the
+continued validity of the return value past the end of the
+full-expression.</p>
+</div>
+</div>
+<div class="section" id="no-object-lifetime-extension">
+<span id="arc-optimization-object-lifetime"></span><h3><a class="toc-backref" href="#id41">No object lifetime extension</a><a class="headerlink" href="#no-object-lifetime-extension" title="Permalink to this headline">¶</a></h3>
+<p>If, in the formal computation history of the program, an object <tt class="docutils literal"><span class="pre">X</span></tt>
+has been deallocated by the time of an observable side-effect, then
+ARC must cause <tt class="docutils literal"><span class="pre">X</span></tt> to be deallocated by no later than the occurrence
+of that side-effect, except as influenced by the re-ordering of the
+destruction of objects.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>This rule is intended to prohibit ARC from observably extending the
+lifetime of a retainable object, other than as specified in this
+document. Together with the rule limiting the transformation of
+releases, this rule requires ARC to eliminate retains and release
+only in pairs.</p>
+<p class="last">ARC’s power to reorder the destruction of objects is critical to its
+ability to do any optimization, for essentially the same reason that
+it must retain the power to decrease the lifetime of an object.
+Unfortunately, while it’s generally poor style for the destruction
+of objects to have arbitrary side-effects, it’s certainly possible.
+Hence the caveat.</p>
+</div>
+</div>
+<div class="section" id="precise-lifetime-semantics">
+<span id="arc-optimization-precise"></span><h3><a class="toc-backref" href="#id42">Precise lifetime semantics</a><a class="headerlink" href="#precise-lifetime-semantics" title="Permalink to this headline">¶</a></h3>
+<p>In general, ARC maintains an invariant that a retainable object pointer held in
+a <tt class="docutils literal"><span class="pre">__strong</span></tt> object will be retained for the full formal lifetime of the
+object. Objects subject to this invariant have <span class="arc-term">precise lifetime
+semantics</span>.</p>
+<p>By default, local variables of automatic storage duration do not have precise
+lifetime semantics. Such objects are simply strong references which hold
+values of retainable object pointer type, and these values are still fully
+subject to the optimizations on values under local control.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Applying these precise-lifetime semantics strictly would be prohibitive.
+Many useful optimizations that might theoretically decrease the lifetime of
+an object would be rendered impossible. Essentially, it promises too much.</p>
+</div>
+<p>A local variable of retainable object owner type and automatic storage duration
+may be annotated with the <tt class="docutils literal"><span class="pre">objc_precise_lifetime</span></tt> attribute to indicate that
+it should be considered to be an object with precise lifetime semantics.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Nonetheless, it is sometimes useful to be able to force an object to be
+released at a precise time, even if that object does not appear to be used.
+This is likely to be uncommon enough that the syntactic weight of explicitly
+requesting these semantics will not be burdensome, and may even make the code
+clearer.</p>
+</div>
+</div>
+</div>
+<div class="section" id="miscellaneous">
+<span id="arc-misc"></span><h2><a class="toc-backref" href="#id43">Miscellaneous</a><a class="headerlink" href="#miscellaneous" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="special-methods">
+<span id="arc-misc-special-methods"></span><h3><a class="toc-backref" href="#id44">Special methods</a><a class="headerlink" href="#special-methods" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="memory-management-methods">
+<span id="arc-misc-special-methods-retain"></span><h4><a class="toc-backref" href="#id45">Memory management methods</a><a class="headerlink" href="#memory-management-methods" title="Permalink to this headline">¶</a></h4>
+<p>A program is ill-formed if it contains a method definition, message send, or
+<tt class="docutils literal"><span class="pre">@selector</span></tt> expression for any of the following selectors:</p>
+<ul class="simple">
+<li><tt class="docutils literal"><span class="pre">autorelease</span></tt></li>
+<li><tt class="docutils literal"><span class="pre">release</span></tt></li>
+<li><tt class="docutils literal"><span class="pre">retain</span></tt></li>
+<li><tt class="docutils literal"><span class="pre">retainCount</span></tt></li>
+</ul>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p><tt class="docutils literal"><span class="pre">retainCount</span></tt> is banned because ARC robs it of consistent semantics. The
+others were banned after weighing three options for how to deal with message
+sends:</p>
+<p><strong>Honoring</strong> them would work out very poorly if a programmer naively or
+accidentally tried to incorporate code written for manual retain/release code
+into an ARC program. At best, such code would do twice as much work as
+necessary; quite frequently, however, ARC and the explicit code would both
+try to balance the same retain, leading to crashes. The cost is losing the
+ability to perform “unrooted” retains, i.e. retains not logically
+corresponding to a strong reference in the object graph.</p>
+<p><strong>Ignoring</strong> them would badly violate user expectations about their code.
+While it <em>would</em> make it easier to develop code simultaneously for ARC and
+non-ARC, there is very little reason to do so except for certain library
+developers. ARC and non-ARC translation units share an execution model and
+can seamlessly interoperate. Within a translation unit, a developer who
+faithfully maintains their code in non-ARC mode is suffering all the
+restrictions of ARC for zero benefit, while a developer who isn’t testing the
+non-ARC mode is likely to be unpleasantly surprised if they try to go back to
+it.</p>
+<p><strong>Banning</strong> them has the disadvantage of making it very awkward to migrate
+existing code to ARC. The best answer to that, given a number of other
+changes and restrictions in ARC, is to provide a specialized tool to assist
+users in that migration.</p>
+<p class="last">Implementing these methods was banned because they are too integral to the
+semantics of ARC; many tricks which worked tolerably under manual reference
+counting will misbehave if ARC performs an ephemeral extra retain or two. If
+absolutely required, it is still possible to implement them in non-ARC code,
+for example in a category; the implementations must obey the <a class="reference internal" href="#arc-objects-retains"><em>semantics</em></a> laid out elsewhere in this document.</p>
+</div>
+</div>
+<div class="section" id="dealloc">
+<span id="arc-misc-special-methods-dealloc"></span><h4><a class="toc-backref" href="#id46"><tt class="docutils literal"><span class="pre">dealloc</span></tt></a><a class="headerlink" href="#dealloc" title="Permalink to this headline">¶</a></h4>
+<p>A program is ill-formed if it contains a message send or <tt class="docutils literal"><span class="pre">@selector</span></tt>
+expression for the selector <tt class="docutils literal"><span class="pre">dealloc</span></tt>.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">There are no legitimate reasons to call <tt class="docutils literal"><span class="pre">dealloc</span></tt> directly.</p>
+</div>
+<p>A class may provide a method definition for an instance method named
+<tt class="docutils literal"><span class="pre">dealloc</span></tt>. This method will be called after the final <tt class="docutils literal"><span class="pre">release</span></tt> of the
+object but before it is deallocated or any of its instance variables are
+destroyed. The superclass’s implementation of <tt class="docutils literal"><span class="pre">dealloc</span></tt> will be called
+automatically when the method returns.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Even though ARC destroys instance variables automatically, there are still
+legitimate reasons to write a <tt class="docutils literal"><span class="pre">dealloc</span></tt> method, such as freeing
+non-retainable resources. Failing to call <tt class="docutils literal"><span class="pre">[super</span> <span class="pre">dealloc]</span></tt> in such a
+method is nearly always a bug. Sometimes, the object is simply trying to
+prevent itself from being destroyed, but <tt class="docutils literal"><span class="pre">dealloc</span></tt> is really far too late
+for the object to be raising such objections. Somewhat more legitimately, an
+object may have been pool-allocated and should not be deallocated with
+<tt class="docutils literal"><span class="pre">free</span></tt>; for now, this can only be supported with a <tt class="docutils literal"><span class="pre">dealloc</span></tt>
+implementation outside of ARC. Such an implementation must be very careful
+to do all the other work that <tt class="docutils literal"><span class="pre">NSObject</span></tt>‘s <tt class="docutils literal"><span class="pre">dealloc</span></tt> would, which is
+outside the scope of this document to describe.</p>
+</div>
+<p>The instance variables for an ARC-compiled class will be destroyed at some
+point after control enters the <tt class="docutils literal"><span class="pre">dealloc</span></tt> method for the root class of the
+class. The ordering of the destruction of instance variables is unspecified,
+both within a single class and between subclasses and superclasses.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>The traditional, non-ARC pattern for destroying instance variables is to
+destroy them immediately before calling <tt class="docutils literal"><span class="pre">[super</span> <span class="pre">dealloc]</span></tt>. Unfortunately,
+message sends from the superclass are quite capable of reaching methods in
+the subclass, and those methods may well read or write to those instance
+variables. Making such message sends from dealloc is generally discouraged,
+since the subclass may well rely on other invariants that were broken during
+<tt class="docutils literal"><span class="pre">dealloc</span></tt>, but it’s not so inescapably dangerous that we felt comfortable
+calling it undefined behavior. Therefore we chose to delay destroying the
+instance variables to a point at which message sends are clearly disallowed:
+the point at which the root class’s deallocation routines take over.</p>
+<p class="last">In most code, the difference is not observable. It can, however, be observed
+if an instance variable holds a strong reference to an object whose
+deallocation will trigger a side-effect which must be carefully ordered with
+respect to the destruction of the super class. Such code violates the design
+principle that semantically important behavior should be explicit. A simple
+fix is to clear the instance variable manually during <tt class="docutils literal"><span class="pre">dealloc</span></tt>; a more
+holistic solution is to move semantically important side-effects out of
+<tt class="docutils literal"><span class="pre">dealloc</span></tt> and into a separate teardown phase which can rely on working with
+well-formed objects.</p>
+</div>
+</div>
+</div>
+<div class="section" id="autoreleasepool">
+<span id="arc-misc-autoreleasepool"></span><h3><a class="toc-backref" href="#id47"><tt class="docutils literal"><span class="pre">@autoreleasepool</span></tt></a><a class="headerlink" href="#autoreleasepool" title="Permalink to this headline">¶</a></h3>
+<p>To simplify the use of autorelease pools, and to bring them under the control
+of the compiler, a new kind of statement is available in Objective-C. It is
+written <tt class="docutils literal"><span class="pre">@autoreleasepool</span></tt> followed by a <em>compound-statement</em>, i.e. by a new
+scope delimited by curly braces. Upon entry to this block, the current state
+of the autorelease pool is captured. When the block is exited normally,
+whether by fallthrough or directed control flow (such as <tt class="docutils literal"><span class="pre">return</span></tt> or
+<tt class="docutils literal"><span class="pre">break</span></tt>), the autorelease pool is restored to the saved state, releasing all
+the objects in it. When the block is exited with an exception, the pool is not
+drained.</p>
+<p><tt class="docutils literal"><span class="pre">@autoreleasepool</span></tt> may be used in non-ARC translation units, with equivalent
+semantics.</p>
+<p>A program is ill-formed if it refers to the <tt class="docutils literal"><span class="pre">NSAutoreleasePool</span></tt> class.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Autorelease pools are clearly important for the compiler to reason about, but
+it is far too much to expect the compiler to accurately reason about control
+dependencies between two calls. It is also very easy to accidentally forget
+to drain an autorelease pool when using the manual API, and this can
+significantly inflate the process’s high-water-mark. The introduction of a
+new scope is unfortunate but basically required for sane interaction with the
+rest of the language. Not draining the pool during an unwind is apparently
+required by the Objective-C exceptions implementation.</p>
+</div>
+</div>
+<div class="section" id="self">
+<span id="arc-misc-self"></span><h3><a class="toc-backref" href="#id48"><tt class="docutils literal"><span class="pre">self</span></tt></a><a class="headerlink" href="#self" title="Permalink to this headline">¶</a></h3>
+<p>The <tt class="docutils literal"><span class="pre">self</span></tt> parameter variable of an Objective-C method is never actually
+retained by the implementation. It is undefined behavior, or at least
+dangerous, to cause an object to be deallocated during a message send to that
+object.</p>
+<p>To make this safe, for Objective-C instance methods <tt class="docutils literal"><span class="pre">self</span></tt> is implicitly
+<tt class="docutils literal"><span class="pre">const</span></tt> unless the method is in the <a class="reference internal" href="#arc-family-semantics-init"><em>init family</em></a>. Further, <tt class="docutils literal"><span class="pre">self</span></tt> is <strong>always</strong> implicitly
+<tt class="docutils literal"><span class="pre">const</span></tt> within a class method.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">The cost of retaining <tt class="docutils literal"><span class="pre">self</span></tt> in all methods was found to be prohibitive, as
+it tends to be live across calls, preventing the optimizer from proving that
+the retain and release are unnecessary — for good reason, as it’s quite
+possible in theory to cause an object to be deallocated during its execution
+without this retain and release. Since it’s extremely uncommon to actually
+do so, even unintentionally, and since there’s no natural way for the
+programmer to remove this retain/release pair otherwise (as there is for
+other parameters by, say, making the variable <tt class="docutils literal"><span class="pre">__unsafe_unretained</span></tt>), we
+chose to make this optimizing assumption and shift some amount of risk to the
+user.</p>
+</div>
+</div>
+<div class="section" id="fast-enumeration-iteration-variables">
+<span id="arc-misc-enumeration"></span><h3><a class="toc-backref" href="#id49">Fast enumeration iteration variables</a><a class="headerlink" href="#fast-enumeration-iteration-variables" title="Permalink to this headline">¶</a></h3>
+<p>If a variable is declared in the condition of an Objective-C fast enumeration
+loop, and the variable has no explicit ownership qualifier, then it is
+qualified with <tt class="docutils literal"><span class="pre">const</span> <span class="pre">__strong</span></tt> and objects encountered during the
+enumeration are not actually retained.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">This is an optimization made possible because fast enumeration loops promise
+to keep the objects retained during enumeration, and the collection itself
+cannot be synchronously modified. It can be overridden by explicitly
+qualifying the variable with <tt class="docutils literal"><span class="pre">__strong</span></tt>, which will make the variable
+mutable again and cause the loop to retain the objects it encounters.</p>
+</div>
+</div>
+<div class="section" id="blocks">
+<span id="arc-misc-blocks"></span><h3><a class="toc-backref" href="#id50">Blocks</a><a class="headerlink" href="#blocks" title="Permalink to this headline">¶</a></h3>
+<p>The implicit <tt class="docutils literal"><span class="pre">const</span></tt> capture variables created when evaluating a block
+literal expression have the same ownership semantics as the local variables
+they capture. The capture is performed by reading from the captured variable
+and initializing the capture variable with that value; the capture variable is
+destroyed when the block literal is, i.e. at the end of the enclosing scope.</p>
+<p>The <a class="reference internal" href="#arc-ownership-inference"><em>inference</em></a> rules apply equally to
+<tt class="docutils literal"><span class="pre">__block</span></tt> variables, which is a shift in semantics from non-ARC, where
+<tt class="docutils literal"><span class="pre">__block</span></tt> variables did not implicitly retain during capture.</p>
+<p><tt class="docutils literal"><span class="pre">__block</span></tt> variables of retainable object owner type are moved off the stack
+by initializing the heap copy with the result of moving from the stack copy.</p>
+<p>With the exception of retains done as part of initializing a <tt class="docutils literal"><span class="pre">__strong</span></tt>
+parameter variable or reading a <tt class="docutils literal"><span class="pre">__weak</span></tt> variable, whenever these semantics
+call for retaining a value of block-pointer type, it has the effect of a
+<tt class="docutils literal"><span class="pre">Block_copy</span></tt>. The optimizer may remove such copies when it sees that the
+result is used only as an argument to a call.</p>
+</div>
+<div class="section" id="exceptions">
+<span id="arc-misc-exceptions"></span><h3><a class="toc-backref" href="#id51">Exceptions</a><a class="headerlink" href="#exceptions" title="Permalink to this headline">¶</a></h3>
+<p>By default in Objective C, ARC is not exception-safe for normal releases:</p>
+<ul class="simple">
+<li>It does not end the lifetime of <tt class="docutils literal"><span class="pre">__strong</span></tt> variables when their scopes are
+abnormally terminated by an exception.</li>
+<li>It does not perform releases which would occur at the end of a
+full-expression if that full-expression throws an exception.</li>
+</ul>
+<p>A program may be compiled with the option <tt class="docutils literal"><span class="pre">-fobjc-arc-exceptions</span></tt> in order to
+enable these, or with the option <tt class="docutils literal"><span class="pre">-fno-objc-arc-exceptions</span></tt> to explicitly
+disable them, with the last such argument “winning”.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">The standard Cocoa convention is that exceptions signal programmer error and
+are not intended to be recovered from. Making code exceptions-safe by
+default would impose severe runtime and code size penalties on code that
+typically does not actually care about exceptions safety. Therefore,
+ARC-generated code leaks by default on exceptions, which is just fine if the
+process is going to be immediately terminated anyway. Programs which do care
+about recovering from exceptions should enable the option.</p>
+</div>
+<p>In Objective-C++, <tt class="docutils literal"><span class="pre">-fobjc-arc-exceptions</span></tt> is enabled by default.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">C++ already introduces pervasive exceptions-cleanup code of the sort that ARC
+introduces. C++ programmers who have not already disabled exceptions are
+much more likely to actual require exception-safety.</p>
+</div>
+<p>ARC does end the lifetimes of <tt class="docutils literal"><span class="pre">__weak</span></tt> objects when an exception terminates
+their scope unless exceptions are disabled in the compiler.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">The consequence of a local <tt class="docutils literal"><span class="pre">__weak</span></tt> object not being destroyed is very
+likely to be corruption of the Objective-C runtime, so we want to be safer
+here. Of course, potentially massive leaks are about as likely to take down
+the process as this corruption is if the program does try to recover from
+exceptions.</p>
+</div>
+</div>
+<div class="section" id="interior-pointers">
+<span id="arc-misc-interior"></span><h3><a class="toc-backref" href="#id52">Interior pointers</a><a class="headerlink" href="#interior-pointers" title="Permalink to this headline">¶</a></h3>
+<p>An Objective-C method returning a non-retainable pointer may be annotated with
+the <tt class="docutils literal"><span class="pre">objc_returns_inner_pointer</span></tt> attribute to indicate that it returns a
+handle to the internal data of an object, and that this reference will be
+invalidated if the object is destroyed. When such a message is sent to an
+object, the object’s lifetime will be extended until at least the earliest of:</p>
+<ul class="simple">
+<li>the last use of the returned pointer, or any pointer derived from it, in the
+calling function or</li>
+<li>the autorelease pool is restored to a previous state.</li>
+</ul>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>Rationale: not all memory and resources are managed with reference counts; it
+is common for objects to manage private resources in their own, private way.
+Typically these resources are completely encapsulated within the object, but
+some classes offer their users direct access for efficiency. If ARC is not
+aware of methods that return such “interior” pointers, its optimizations can
+cause the owning object to be reclaimed too soon. This attribute informs ARC
+that it must tread lightly.</p>
+<p class="last">The extension rules are somewhat intentionally vague. The autorelease pool
+limit is there to permit a simple implementation to simply retain and
+autorelease the receiver. The other limit permits some amount of
+optimization. The phrase “derived from” is intended to encompass the results
+both of pointer transformations, such as casts and arithmetic, and of loading
+from such derived pointers; furthermore, it applies whether or not such
+derivations are applied directly in the calling code or by other utility code
+(for example, the C library routine <tt class="docutils literal"><span class="pre">strchr</span></tt>). However, the implementation
+never need account for uses after a return from the code which calls the
+method returning an interior pointer.</p>
+</div>
+<p>As an exception, no extension is required if the receiver is loaded directly
+from a <tt class="docutils literal"><span class="pre">__strong</span></tt> object with <a class="reference internal" href="#arc-optimization-precise"><em>precise lifetime semantics</em></a>.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Implicit autoreleases carry the risk of significantly inflating memory use,
+so it’s important to provide users a way of avoiding these autoreleases.
+Tying this to precise lifetime semantics is ideal, as for local variables
+this requires a very explicit annotation, which allows ARC to trust the user
+with good cheer.</p>
+</div>
+</div>
+<div class="section" id="c-retainable-pointer-types">
+<span id="arc-misc-c-retainable"></span><h3><a class="toc-backref" href="#id53">C retainable pointer types</a><a class="headerlink" href="#c-retainable-pointer-types" title="Permalink to this headline">¶</a></h3>
+<p>A type is a <span class="arc-term">C retainable pointer type</span> if it is a pointer to
+(possibly qualified) <tt class="docutils literal"><span class="pre">void</span></tt> or a pointer to a (possibly qualifier) <tt class="docutils literal"><span class="pre">struct</span></tt>
+or <tt class="docutils literal"><span class="pre">class</span></tt> type.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">ARC does not manage pointers of CoreFoundation type (or any of the related
+families of retainable C pointers which interoperate with Objective-C for
+retain/release operation). In fact, ARC does not even know how to
+distinguish these types from arbitrary C pointer types. The intent of this
+concept is to filter out some obviously non-object types while leaving a hook
+for later tightening if a means of exhaustively marking CF types is made
+available.</p>
+</div>
+<div class="section" id="auditing-of-c-retainable-pointer-interfaces">
+<span id="arc-misc-c-retainable-audit"></span><h4><a class="toc-backref" href="#id54">Auditing of C retainable pointer interfaces</a><a class="headerlink" href="#auditing-of-c-retainable-pointer-interfaces" title="Permalink to this headline">¶</a></h4>
+<p><span class="when-revised">[beginning Apple 4.0, LLVM 3.1]</span></p>
+<p>A C function may be marked with the <tt class="docutils literal"><span class="pre">cf_audited_transfer</span></tt> attribute to
+express that, except as otherwise marked with attributes, it obeys the
+parameter (consuming vs. non-consuming) and return (retained vs. non-retained)
+conventions for a C function of its name, namely:</p>
+<ul class="simple">
+<li>A parameter of C retainable pointer type is assumed to not be consumed
+unless it is marked with the <tt class="docutils literal"><span class="pre">cf_consumed</span></tt> attribute, and</li>
+<li>A result of C retainable pointer type is assumed to not be returned retained
+unless the function is either marked <tt class="docutils literal"><span class="pre">cf_returns_retained</span></tt> or it follows
+the create/copy naming convention and is not marked
+<tt class="docutils literal"><span class="pre">cf_returns_not_retained</span></tt>.</li>
+</ul>
+<p>A function obeys the <span class="arc-term">create/copy</span> naming convention if its name
+contains as a substring:</p>
+<ul class="simple">
+<li>either “Create” or “Copy” not followed by a lowercase letter, or</li>
+<li>either “create” or “copy” not followed by a lowercase letter and
+not preceded by any letter, whether uppercase or lowercase.</li>
+</ul>
+<p>A second attribute, <tt class="docutils literal"><span class="pre">cf_unknown_transfer</span></tt>, signifies that a function’s
+transfer semantics cannot be accurately captured using any of these
+annotations. A program is ill-formed if it annotates the same function with
+both <tt class="docutils literal"><span class="pre">cf_audited_transfer</span></tt> and <tt class="docutils literal"><span class="pre">cf_unknown_transfer</span></tt>.</p>
+<p>A pragma is provided to facilitate the mass annotation of interfaces:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="cp">#pragma clang arc_cf_code_audited begin</span>
+<span class="p">...</span>
+<span class="cp">#pragma clang arc_cf_code_audited end</span>
+</pre></div>
+</div>
+<p>All C functions declared within the extent of this pragma are treated as if
+annotated with the <tt class="docutils literal"><span class="pre">cf_audited_transfer</span></tt> attribute unless they otherwise have
+the <tt class="docutils literal"><span class="pre">cf_unknown_transfer</span></tt> attribute. The pragma is accepted in all language
+modes. A program is ill-formed if it attempts to change files, whether by
+including a file or ending the current file, within the extent of this pragma.</p>
+<p>It is possible to test for all the features in this section with
+<tt class="docutils literal"><span class="pre">__has_feature(arc_cf_code_audited)</span></tt>.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">A significant inconvenience in ARC programming is the necessity of
+interacting with APIs based around C retainable pointers. These features are
+designed to make it relatively easy for API authors to quickly review and
+annotate their interfaces, in turn improving the fidelity of tools such as
+the static analyzer and ARC. The single-file restriction on the pragma is
+designed to eliminate the risk of accidentally annotating some other header’s
+interfaces.</p>
+</div>
+</div>
+</div>
+</div>
+<div class="section" id="runtime-support">
+<span id="arc-runtime"></span><h2><a class="toc-backref" href="#id55">Runtime support</a><a class="headerlink" href="#runtime-support" title="Permalink to this headline">¶</a></h2>
+<p>This section describes the interaction between the ARC runtime and the code
+generated by the ARC compiler. This is not part of the ARC language
+specification; instead, it is effectively a language-specific ABI supplement,
+akin to the “Itanium” generic ABI for C++.</p>
+<p>Ownership qualification does not alter the storage requirements for objects,
+except that it is undefined behavior if a <tt class="docutils literal"><span class="pre">__weak</span></tt> object is inadequately
+aligned for an object of type <tt class="docutils literal"><span class="pre">id</span></tt>. The other qualifiers may be used on
+explicitly under-aligned memory.</p>
+<p>The runtime tracks <tt class="docutils literal"><span class="pre">__weak</span></tt> objects which holds non-null values. It is
+undefined behavior to direct modify a <tt class="docutils literal"><span class="pre">__weak</span></tt> object which is being tracked
+by the runtime except through an
+<a class="reference internal" href="#arc-runtime-objc-storeweak"><em>objc_storeWeak</em></a>,
+<a class="reference internal" href="#arc-runtime-objc-destroyweak"><em>objc_destroyWeak</em></a>, or
+<a class="reference internal" href="#arc-runtime-objc-moveweak"><em>objc_moveWeak</em></a> call.</p>
+<p>The runtime must provide a number of new entrypoints which the compiler may
+emit, which are described in the remainder of this section.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p>Several of these functions are semantically equivalent to a message send; we
+emit calls to C functions instead because:</p>
+<ul class="simple">
+<li>the machine code to do so is significantly smaller,</li>
+<li>it is much easier to recognize the C functions in the ARC optimizer, and</li>
+<li>a sufficient sophisticated runtime may be able to avoid the message send in
+common cases.</li>
+</ul>
+<p class="last">Several other of these functions are “fused” operations which can be
+described entirely in terms of other operations. We use the fused operations
+primarily as a code-size optimization, although in some cases there is also a
+real potential for avoiding redundant operations in the runtime.</p>
+</div>
+<div class="section" id="arc-runtime-objc-autorelease">
+<span id="id-objc-autorelease-id-value"></span><h3><a class="toc-backref" href="#id56"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_autorelease(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-autorelease" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, it adds the object
+to the innermost autorelease pool exactly as if the object had been sent the
+<tt class="docutils literal"><span class="pre">autorelease</span></tt> message.</p>
+<p>Always returns <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+</div>
+<div class="section" id="void-objc-autoreleasepoolpop-void-pool">
+<span id="arc-runtime-objc-autoreleasepoolpop"></span><h3><a class="toc-backref" href="#id57"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_autoreleasePoolPop(void</span> <span class="pre">*pool);</span></tt></a><a class="headerlink" href="#void-objc-autoreleasepoolpop-void-pool" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">pool</span></tt> is the result of a previous call to
+<a class="reference internal" href="#arc-runtime-objc-autoreleasepoolpush"><em>objc_autoreleasePoolPush</em></a> on the
+current thread, where neither <tt class="docutils literal"><span class="pre">pool</span></tt> nor any enclosing pool have previously
+been popped.</p>
+<p>Releases all the objects added to the given autorelease pool and any
+autorelease pools it encloses, then sets the current autorelease pool to the
+pool directly enclosing <tt class="docutils literal"><span class="pre">pool</span></tt>.</p>
+</div>
+<div class="section" id="void-objc-autoreleasepoolpush-void">
+<span id="arc-runtime-objc-autoreleasepoolpush"></span><h3><a class="toc-backref" href="#id58"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">*objc_autoreleasePoolPush(void);</span></tt></a><a class="headerlink" href="#void-objc-autoreleasepoolpush-void" title="Permalink to this headline">¶</a></h3>
+<p>Creates a new autorelease pool that is enclosed by the current pool, makes that
+the current pool, and returns an opaque “handle” to it.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">While the interface is described as an explicit hierarchy of pools, the rules
+allow the implementation to just keep a stack of objects, using the stack
+depth as the opaque pool handle.</p>
+</div>
+</div>
+<div class="section" id="arc-runtime-objc-autoreleasereturnvalue">
+<span id="id-objc-autoreleasereturnvalue-id-value"></span><h3><a class="toc-backref" href="#id59"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_autoreleaseReturnValue(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-autoreleasereturnvalue" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, it makes a best
+effort to hand off ownership of a retain count on the object to a call to
+<a class="reference internal" href="#arc-runtime-objc-retainautoreleasedreturnvalue"><em>objc_retainAutoreleasedReturnValue</em></a> for the same object in an
+enclosing call frame. If this is not possible, the object is autoreleased as
+above.</p>
+<p>Always returns <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+</div>
+<div class="section" id="void-objc-copyweak-id-dest-id-src">
+<span id="arc-runtime-objc-copyweak"></span><h3><a class="toc-backref" href="#id60"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_copyWeak(id</span> <span class="pre">*dest,</span> <span class="pre">id</span> <span class="pre">*src);</span></tt></a><a class="headerlink" href="#void-objc-copyweak-id-dest-id-src" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">src</span></tt> is a valid pointer which either contains a null pointer
+or has been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object. <tt class="docutils literal"><span class="pre">dest</span></tt> is a valid pointer
+which has not been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object.</p>
+<p><tt class="docutils literal"><span class="pre">dest</span></tt> is initialized to be equivalent to <tt class="docutils literal"><span class="pre">src</span></tt>, potentially registering it
+with the runtime. Equivalent to the following code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">objc_copyWeak</span><span class="p">(</span><span class="kt">id</span> <span class="o">*</span><span class="n">dest</span><span class="p">,</span> <span class="kt">id</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">objc_release</span><span class="p">(</span><span class="n">objc_initWeak</span><span class="p">(</span><span class="n">dest</span><span class="p">,</span> <span class="n">objc_loadWeakRetained</span><span class="p">(</span><span class="n">src</span><span class="p">)));</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Must be atomic with respect to calls to <tt class="docutils literal"><span class="pre">objc_storeWeak</span></tt> on <tt class="docutils literal"><span class="pre">src</span></tt>.</p>
+</div>
+<div class="section" id="void-objc-destroyweak-id-object">
+<span id="arc-runtime-objc-destroyweak"></span><h3><a class="toc-backref" href="#id61"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_destroyWeak(id</span> <span class="pre">*object);</span></tt></a><a class="headerlink" href="#void-objc-destroyweak-id-object" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">object</span></tt> is a valid pointer which either contains a null
+pointer or has been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object.</p>
+<p><tt class="docutils literal"><span class="pre">object</span></tt> is unregistered as a weak object, if it ever was. The current value
+of <tt class="docutils literal"><span class="pre">object</span></tt> is left unspecified; otherwise, equivalent to the following code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">objc_destroyWeak</span><span class="p">(</span><span class="kt">id</span> <span class="o">*</span><span class="n">object</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">objc_storeWeak</span><span class="p">(</span><span class="n">object</span><span class="p">,</span> <span class="nb">nil</span><span class="p">);</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Does not need to be atomic with respect to calls to <tt class="docutils literal"><span class="pre">objc_storeWeak</span></tt> on
+<tt class="docutils literal"><span class="pre">object</span></tt>.</p>
+</div>
+<div class="section" id="arc-runtime-objc-initweak">
+<span id="id-objc-initweak-id-object-id-value"></span><h3><a class="toc-backref" href="#id62"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_initWeak(id</span> <span class="pre">*object,</span> <span class="pre">id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-initweak" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">object</span></tt> is a valid pointer which has not been registered as
+a <tt class="docutils literal"><span class="pre">__weak</span></tt> object. <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is a null pointer or the object to which it points has begun
+deallocation, <tt class="docutils literal"><span class="pre">object</span></tt> is zero-initialized. Otherwise, <tt class="docutils literal"><span class="pre">object</span></tt> is
+registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object pointing to <tt class="docutils literal"><span class="pre">value</span></tt>. Equivalent to the
+following code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">id</span> <span class="nf">objc_initWeak</span><span class="p">(</span><span class="kt">id</span> <span class="o">*</span><span class="n">object</span><span class="p">,</span> <span class="kt">id</span> <span class="n">value</span><span class="p">)</span> <span class="p">{</span>
+ <span class="o">*</span><span class="n">object</span> <span class="o">=</span> <span class="nb">nil</span><span class="p">;</span>
+ <span class="k">return</span> <span class="n">objc_storeWeak</span><span class="p">(</span><span class="n">object</span><span class="p">,</span> <span class="n">value</span><span class="p">);</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Returns the value of <tt class="docutils literal"><span class="pre">object</span></tt> after the call.</p>
+<p>Does not need to be atomic with respect to calls to <tt class="docutils literal"><span class="pre">objc_storeWeak</span></tt> on
+<tt class="docutils literal"><span class="pre">object</span></tt>.</p>
+</div>
+<div class="section" id="arc-runtime-objc-loadweak">
+<span id="id-objc-loadweak-id-object"></span><h3><a class="toc-backref" href="#id63"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_loadWeak(id</span> <span class="pre">*object);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-loadweak" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">object</span></tt> is a valid pointer which either contains a null
+pointer or has been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object.</p>
+<p>If <tt class="docutils literal"><span class="pre">object</span></tt> is registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object, and the last value stored
+into <tt class="docutils literal"><span class="pre">object</span></tt> has not yet been deallocated or begun deallocation, retains and
+autoreleases that value and returns it. Otherwise returns null. Equivalent to
+the following code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">id</span> <span class="nf">objc_loadWeak</span><span class="p">(</span><span class="kt">id</span> <span class="o">*</span><span class="n">object</span><span class="p">)</span> <span class="p">{</span>
+ <span class="k">return</span> <span class="n">objc_autorelease</span><span class="p">(</span><span class="n">objc_loadWeakRetained</span><span class="p">(</span><span class="n">object</span><span class="p">));</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Must be atomic with respect to calls to <tt class="docutils literal"><span class="pre">objc_storeWeak</span></tt> on <tt class="docutils literal"><span class="pre">object</span></tt>.</p>
+<div class="admonition-rationale admonition">
+<p class="first admonition-title">Rationale</p>
+<p class="last">Loading weak references would be inherently prone to race conditions without
+the retain.</p>
+</div>
+</div>
+<div class="section" id="arc-runtime-objc-loadweakretained">
+<span id="id-objc-loadweakretained-id-object"></span><h3><a class="toc-backref" href="#id64"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_loadWeakRetained(id</span> <span class="pre">*object);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-loadweakretained" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">object</span></tt> is a valid pointer which either contains a null
+pointer or has been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object.</p>
+<p>If <tt class="docutils literal"><span class="pre">object</span></tt> is registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object, and the last value stored
+into <tt class="docutils literal"><span class="pre">object</span></tt> has not yet been deallocated or begun deallocation, retains
+that value and returns it. Otherwise returns null.</p>
+<p>Must be atomic with respect to calls to <tt class="docutils literal"><span class="pre">objc_storeWeak</span></tt> on <tt class="docutils literal"><span class="pre">object</span></tt>.</p>
+</div>
+<div class="section" id="void-objc-moveweak-id-dest-id-src">
+<span id="arc-runtime-objc-moveweak"></span><h3><a class="toc-backref" href="#id65"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_moveWeak(id</span> <span class="pre">*dest,</span> <span class="pre">id</span> <span class="pre">*src);</span></tt></a><a class="headerlink" href="#void-objc-moveweak-id-dest-id-src" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">src</span></tt> is a valid pointer which either contains a null pointer
+or has been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object. <tt class="docutils literal"><span class="pre">dest</span></tt> is a valid pointer
+which has not been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object.</p>
+<p><tt class="docutils literal"><span class="pre">dest</span></tt> is initialized to be equivalent to <tt class="docutils literal"><span class="pre">src</span></tt>, potentially registering it
+with the runtime. <tt class="docutils literal"><span class="pre">src</span></tt> may then be left in its original state, in which
+case this call is equivalent to <a class="reference internal" href="#arc-runtime-objc-copyweak"><em>objc_copyWeak</em></a>, or it may be left as null.</p>
+<p>Must be atomic with respect to calls to <tt class="docutils literal"><span class="pre">objc_storeWeak</span></tt> on <tt class="docutils literal"><span class="pre">src</span></tt>.</p>
+</div>
+<div class="section" id="void-objc-release-id-value">
+<span id="arc-runtime-objc-release"></span><h3><a class="toc-backref" href="#id66"><tt class="docutils literal"><span class="pre">void</span> <span class="pre">objc_release(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#void-objc-release-id-value" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, it performs a
+release operation exactly as if the object had been sent the <tt class="docutils literal"><span class="pre">release</span></tt>
+message.</p>
+</div>
+<div class="section" id="arc-runtime-objc-retain">
+<span id="id-objc-retain-id-value"></span><h3><a class="toc-backref" href="#id67"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retain(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-retain" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, it performs a retain
+operation exactly as if the object had been sent the <tt class="docutils literal"><span class="pre">retain</span></tt> message.</p>
+<p>Always returns <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+</div>
+<div class="section" id="arc-runtime-objc-retainautorelease">
+<span id="id-objc-retainautorelease-id-value"></span><h3><a class="toc-backref" href="#id68"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainAutorelease(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-retainautorelease" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, it performs a retain
+operation followed by an autorelease operation. Equivalent to the following
+code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">id</span> <span class="nf">objc_retainAutorelease</span><span class="p">(</span><span class="kt">id</span> <span class="n">value</span><span class="p">)</span> <span class="p">{</span>
+ <span class="k">return</span> <span class="n">objc_autorelease</span><span class="p">(</span><span class="n">objc_retain</span><span class="p">(</span><span class="n">value</span><span class="p">));</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Always returns <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+</div>
+<div class="section" id="arc-runtime-objc-retainautoreleasereturnvalue">
+<span id="id-objc-retainautoreleasereturnvalue-id-value"></span><h3><a class="toc-backref" href="#id69"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainAutoreleaseReturnValue(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-retainautoreleasereturnvalue" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, it performs a retain
+operation followed by the operation described in
+<a class="reference internal" href="#arc-runtime-objc-autoreleasereturnvalue"><em>objc_autoreleaseReturnValue</em></a>.
+Equivalent to the following code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">id</span> <span class="nf">objc_retainAutoreleaseReturnValue</span><span class="p">(</span><span class="kt">id</span> <span class="n">value</span><span class="p">)</span> <span class="p">{</span>
+ <span class="k">return</span> <span class="n">objc_autoreleaseReturnValue</span><span class="p">(</span><span class="n">objc_retain</span><span class="p">(</span><span class="n">value</span><span class="p">));</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Always returns <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+</div>
+<div class="section" id="arc-runtime-objc-retainautoreleasedreturnvalue">
+<span id="id-objc-retainautoreleasedreturnvalue-id-value"></span><h3><a class="toc-backref" href="#id70"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainAutoreleasedReturnValue(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-retainautoreleasedreturnvalue" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, it attempts to
+accept a hand off of a retain count from a call to
+<a class="reference internal" href="#arc-runtime-objc-autoreleasereturnvalue"><em>objc_autoreleaseReturnValue</em></a> on
+<tt class="docutils literal"><span class="pre">value</span></tt> in a recently-called function or something it calls. If that fails,
+it performs a retain operation exactly like <a class="reference internal" href="#arc-runtime-objc-retain"><em>objc_retain</em></a>.</p>
+<p>Always returns <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+</div>
+<div class="section" id="arc-runtime-objc-retainblock">
+<span id="id-objc-retainblock-id-value"></span><h3><a class="toc-backref" href="#id71"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_retainBlock(id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-retainblock" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid block object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is null, this call has no effect. Otherwise, if the block pointed
+to by <tt class="docutils literal"><span class="pre">value</span></tt> is still on the stack, it is copied to the heap and the address
+of the copy is returned. Otherwise a retain operation is performed on the
+block exactly as if it had been sent the <tt class="docutils literal"><span class="pre">retain</span></tt> message.</p>
+</div>
+<div class="section" id="arc-runtime-objc-storestrong">
+<span id="id-objc-storestrong-id-object-id-value"></span><h3><a class="toc-backref" href="#id72"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_storeStrong(id</span> <span class="pre">*object,</span> <span class="pre">id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-storestrong" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">object</span></tt> is a valid pointer to a <tt class="docutils literal"><span class="pre">__strong</span></tt> object which is
+adequately aligned for a pointer. <tt class="docutils literal"><span class="pre">value</span></tt> is null or a pointer to a valid
+object.</p>
+<p>Performs the complete sequence for assigning to a <tt class="docutils literal"><span class="pre">__strong</span></tt> object of
+non-block type <a class="footnote-reference" href="#id3" id="id2">[*]</a>. Equivalent to the following code:</p>
+<div class="highlight-objc"><div class="highlight"><pre><span class="kt">id</span> <span class="nf">objc_storeStrong</span><span class="p">(</span><span class="kt">id</span> <span class="o">*</span><span class="n">object</span><span class="p">,</span> <span class="kt">id</span> <span class="n">value</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">value</span> <span class="o">=</span> <span class="p">[</span><span class="n">value</span> <span class="n">retain</span><span class="p">];</span>
+ <span class="kt">id</span> <span class="n">oldValue</span> <span class="o">=</span> <span class="o">*</span><span class="n">object</span><span class="p">;</span>
+ <span class="o">*</span><span class="n">object</span> <span class="o">=</span> <span class="n">value</span><span class="p">;</span>
+ <span class="p">[</span><span class="n">oldValue</span> <span class="n">release</span><span class="p">];</span>
+ <span class="k">return</span> <span class="n">value</span><span class="p">;</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Always returns <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+<table class="docutils footnote" frame="void" id="id3" rules="none">
+<colgroup><col class="label" /><col /></colgroup>
+<tbody valign="top">
+<tr><td class="label"><a class="fn-backref" href="#id2">[*]</a></td><td>This does not imply that a <tt class="docutils literal"><span class="pre">__strong</span></tt> object of block type is an
+invalid argument to this function. Rather it implies that an <tt class="docutils literal"><span class="pre">objc_retain</span></tt>
+and not an <tt class="docutils literal"><span class="pre">objc_retainBlock</span></tt> operation will be emitted if the argument is
+a block.</td></tr>
+</tbody>
+</table>
+</div>
+<div class="section" id="arc-runtime-objc-storeweak">
+<span id="id-objc-storeweak-id-object-id-value"></span><h3><a class="toc-backref" href="#id73"><tt class="docutils literal"><span class="pre">id</span> <span class="pre">objc_storeWeak(id</span> <span class="pre">*object,</span> <span class="pre">id</span> <span class="pre">value);</span></tt></a><a class="headerlink" href="#arc-runtime-objc-storeweak" title="Permalink to this headline">¶</a></h3>
+<p><em>Precondition:</em> <tt class="docutils literal"><span class="pre">object</span></tt> is a valid pointer which either contains a null
+pointer or has been registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object. <tt class="docutils literal"><span class="pre">value</span></tt> is null or a
+pointer to a valid object.</p>
+<p>If <tt class="docutils literal"><span class="pre">value</span></tt> is a null pointer or the object to which it points has begun
+deallocation, <tt class="docutils literal"><span class="pre">object</span></tt> is assigned null and unregistered as a <tt class="docutils literal"><span class="pre">__weak</span></tt>
+object. Otherwise, <tt class="docutils literal"><span class="pre">object</span></tt> is registered as a <tt class="docutils literal"><span class="pre">__weak</span></tt> object or has its
+registration updated to point to <tt class="docutils literal"><span class="pre">value</span></tt>.</p>
+<p>Returns the value of <tt class="docutils literal"><span class="pre">object</span></tt> after the call.</p>
+</div>
+</div>
+</div>
+
+
+ </div>
+ <div class="bottomnav">
+
+ <p>
+ « <a href="Block-ABI-Apple.html">Block Implementation Specification</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="AttributeReference.html">Attributes in Clang</a> »
+ </p>
+
+ </div>
+
+ <div class="footer">
+ © Copyright 2007-2016, The Clang Team.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
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+</html>
\ No newline at end of file
Added: www-releases/trunk/3.8.0/tools/clang/docs/Block-ABI-Apple.html
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/tools/clang/docs/Block-ABI-Apple.html?rev=262945&view=auto
==============================================================================
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+++ www-releases/trunk/3.8.0/tools/clang/docs/Block-ABI-Apple.html Tue Mar 8 12:28:17 2016
@@ -0,0 +1,909 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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+ <title>Block Implementation Specification — Clang 3.8 documentation</title>
+
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+ </head>
+ <body>
+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>Clang 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>Block Implementation Specification</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ « <a href="BlockLanguageSpec.html">Language Specification for Blocks</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="AutomaticReferenceCounting.html">Objective-C Automatic Reference Counting (ARC)</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <div class="section" id="block-implementation-specification">
+<h1>Block Implementation Specification<a class="headerlink" href="#block-implementation-specification" title="Permalink to this headline">¶</a></h1>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#history" id="id1">History</a></li>
+<li><a class="reference internal" href="#high-level" id="id2">High Level</a></li>
+<li><a class="reference internal" href="#imported-variables" id="id3">Imported Variables</a><ul>
+<li><a class="reference internal" href="#imported-const-copy-variables" id="id4">Imported <tt class="docutils literal"><span class="pre">const</span></tt> copy variables</a></li>
+<li><a class="reference internal" href="#imported-const-copy-of-block-reference" id="id5">Imported <tt class="docutils literal"><span class="pre">const</span></tt> copy of <tt class="docutils literal"><span class="pre">Block</span></tt> reference</a><ul>
+<li><a class="reference internal" href="#importing-attribute-nsobject-variables" id="id6">Importing <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> variables</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#imported-block-marked-variables" id="id7">Imported <tt class="docutils literal"><span class="pre">__block</span></tt> marked variables</a><ul>
+<li><a class="reference internal" href="#layout-of-block-marked-variables" id="id8">Layout of <tt class="docutils literal"><span class="pre">__block</span></tt> marked variables</a></li>
+<li><a class="reference internal" href="#access-to-block-variables-from-within-its-lexical-scope" id="id9">Access to <tt class="docutils literal"><span class="pre">__block</span></tt> variables from within its lexical scope</a></li>
+<li><a class="reference internal" href="#importing-block-variables-into-blocks" id="id10">Importing <tt class="docutils literal"><span class="pre">__block</span></tt> variables into <tt class="docutils literal"><span class="pre">Blocks</span></tt></a></li>
+<li><a class="reference internal" href="#importing-attribute-nsobject-block-variables" id="id11">Importing <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> <tt class="docutils literal"><span class="pre">__block</span></tt> variables</a></li>
+<li><a class="reference internal" href="#block-escapes" id="id12"><tt class="docutils literal"><span class="pre">__block</span></tt> escapes</a></li>
+<li><a class="reference internal" href="#nesting" id="id13">Nesting</a></li>
+</ul>
+</li>
+</ul>
+</li>
+<li><a class="reference internal" href="#objective-c-extensions-to-blocks" id="id14">Objective C Extensions to <tt class="docutils literal"><span class="pre">Blocks</span></tt></a><ul>
+<li><a class="reference internal" href="#importing-objects" id="id15">Importing Objects</a></li>
+<li><a class="reference internal" href="#blocks-as-objects" id="id16"><tt class="docutils literal"><span class="pre">Blocks</span></tt> as Objects</a></li>
+<li><a class="reference internal" href="#weak-block-support" id="id17"><tt class="docutils literal"><span class="pre">__weak</span> <span class="pre">__block</span></tt> Support</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#c-support" id="id18">C++ Support</a></li>
+<li><a class="reference internal" href="#runtime-helper-functions" id="id19">Runtime Helper Functions</a></li>
+<li><a class="reference internal" href="#copyright" id="id20">Copyright</a></li>
+</ul>
+</div>
+<div class="section" id="history">
+<h2><a class="toc-backref" href="#id1">History</a><a class="headerlink" href="#history" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li>2008/7/14 - created.</li>
+<li>2008/8/21 - revised, C++.</li>
+<li>2008/9/24 - add <tt class="docutils literal"><span class="pre">NULL</span></tt> <tt class="docutils literal"><span class="pre">isa</span></tt> field to <tt class="docutils literal"><span class="pre">__block</span></tt> storage.</li>
+<li>2008/10/1 - revise block layout to use a <tt class="docutils literal"><span class="pre">static</span></tt> descriptor structure.</li>
+<li>2008/10/6 - revise block layout to use an unsigned long int flags.</li>
+<li>2008/10/28 - specify use of <tt class="docutils literal"><span class="pre">_Block_object_assign</span></tt> and
+<tt class="docutils literal"><span class="pre">_Block_object_dispose</span></tt> for all “Object” types in helper functions.</li>
+<li>2008/10/30 - revise new layout to have invoke function in same place.</li>
+<li>2008/10/30 - add <tt class="docutils literal"><span class="pre">__weak</span></tt> support.</li>
+<li>2010/3/16 - rev for stret return, signature field.</li>
+<li>2010/4/6 - improved wording.</li>
+<li>2013/1/6 - improved wording and converted to rst.</li>
+</ul>
+<p>This document describes the Apple ABI implementation specification of Blocks.</p>
+<p>The first shipping version of this ABI is found in Mac OS X 10.6, and shall be
+referred to as 10.6.ABI. As of 2010/3/16, the following describes the ABI
+contract with the runtime and the compiler, and, as necessary, will be referred
+to as ABI.2010.3.16.</p>
+<p>Since the Apple ABI references symbols from other elements of the system, any
+attempt to use this ABI on systems prior to SnowLeopard is undefined.</p>
+</div>
+<div class="section" id="high-level">
+<h2><a class="toc-backref" href="#id2">High Level</a><a class="headerlink" href="#high-level" title="Permalink to this headline">¶</a></h2>
+<p>The ABI of <tt class="docutils literal"><span class="pre">Blocks</span></tt> consist of their layout and the runtime functions required
+by the compiler. A <tt class="docutils literal"><span class="pre">Block</span></tt> consists of a structure of the following form:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">Block_literal_1</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span> <span class="c1">// initialized to &_NSConcreteStackBlock or &_NSConcreteGlobalBlock</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">invoke</span><span class="p">)(</span><span class="kt">void</span> <span class="o">*</span><span class="p">,</span> <span class="p">...);</span>
+ <span class="k">struct</span> <span class="n">Block_descriptor_1</span> <span class="p">{</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span> <span class="c1">// NULL</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">size</span><span class="p">;</span> <span class="c1">// sizeof(struct Block_literal_1)</span>
+ <span class="c1">// optional helper functions</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">copy_helper</span><span class="p">)(</span><span class="kt">void</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span> <span class="c1">// IFF (1<<25)</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">dispose_helper</span><span class="p">)(</span><span class="kt">void</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span> <span class="c1">// IFF (1<<25)</span>
+ <span class="c1">// required ABI.2010.3.16</span>
+ <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">signature</span><span class="p">;</span> <span class="c1">// IFF (1<<30)</span>
+ <span class="p">}</span> <span class="o">*</span><span class="n">descriptor</span><span class="p">;</span>
+ <span class="c1">// imported variables</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>The following flags bits are in use thusly for a possible ABI.2010.3.16:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">enum</span> <span class="p">{</span>
+ <span class="n">BLOCK_HAS_COPY_DISPOSE</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">25</span><span class="p">),</span>
+ <span class="n">BLOCK_HAS_CTOR</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">26</span><span class="p">),</span> <span class="c1">// helpers have C++ code</span>
+ <span class="n">BLOCK_IS_GLOBAL</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">28</span><span class="p">),</span>
+ <span class="n">BLOCK_HAS_STRET</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">29</span><span class="p">),</span> <span class="c1">// IFF BLOCK_HAS_SIGNATURE</span>
+ <span class="n">BLOCK_HAS_SIGNATURE</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">30</span><span class="p">),</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>In 10.6.ABI the (1<<29) was usually set and was always ignored by the runtime -
+it had been a transitional marker that did not get deleted after the
+transition. This bit is now paired with (1<<30), and represented as the pair
+(3<<30), for the following combinations of valid bit settings, and their
+meanings:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">switch</span> <span class="p">(</span><span class="n">flags</span> <span class="o">&</span> <span class="p">(</span><span class="mi">3</span><span class="o"><<</span><span class="mi">29</span><span class="p">))</span> <span class="p">{</span>
+ <span class="k">case</span> <span class="p">(</span><span class="mi">0</span><span class="o"><<</span><span class="mi">29</span><span class="p">)</span>: <span class="mf">10.6</span><span class="p">.</span><span class="n">ABI</span><span class="p">,</span> <span class="n">no</span> <span class="n">signature</span> <span class="n">field</span> <span class="n">available</span>
+ <span class="k">case</span> <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">)</span>: <span class="mf">10.6</span><span class="p">.</span><span class="n">ABI</span><span class="p">,</span> <span class="n">no</span> <span class="n">signature</span> <span class="n">field</span> <span class="n">available</span>
+ <span class="k">case</span> <span class="p">(</span><span class="mi">2</span><span class="o"><<</span><span class="mi">29</span><span class="p">)</span>: <span class="n">ABI</span><span class="mf">.2010.3.16</span><span class="p">,</span> <span class="n">regular</span> <span class="n">calling</span> <span class="n">convention</span><span class="p">,</span> <span class="n">presence</span> <span class="n">of</span> <span class="n">signature</span> <span class="n">field</span>
+ <span class="k">case</span> <span class="p">(</span><span class="mi">3</span><span class="o"><<</span><span class="mi">29</span><span class="p">)</span>: <span class="n">ABI</span><span class="mf">.2010.3.16</span><span class="p">,</span> <span class="n">stret</span> <span class="n">calling</span> <span class="n">convention</span><span class="p">,</span> <span class="n">presence</span> <span class="n">of</span> <span class="n">signature</span> <span class="n">field</span><span class="p">,</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>The signature field is not always populated.</p>
+<p>The following discussions are presented as 10.6.ABI otherwise.</p>
+<p><tt class="docutils literal"><span class="pre">Block</span></tt> literals may occur within functions where the structure is created in
+stack local memory. They may also appear as initialization expressions for
+<tt class="docutils literal"><span class="pre">Block</span></tt> variables of global or <tt class="docutils literal"><span class="pre">static</span></tt> local variables.</p>
+<p>When a <tt class="docutils literal"><span class="pre">Block</span></tt> literal expression is evaluated the stack based structure is
+initialized as follows:</p>
+<ol class="arabic simple">
+<li>A <tt class="docutils literal"><span class="pre">static</span></tt> descriptor structure is declared and initialized as follows:</li>
+</ol>
+<blockquote>
+<div><p>a. The <tt class="docutils literal"><span class="pre">invoke</span></tt> function pointer is set to a function that takes the
+<tt class="docutils literal"><span class="pre">Block</span></tt> structure as its first argument and the rest of the arguments (if
+any) to the <tt class="docutils literal"><span class="pre">Block</span></tt> and executes the <tt class="docutils literal"><span class="pre">Block</span></tt> compound statement.</p>
+<p>b. The <tt class="docutils literal"><span class="pre">size</span></tt> field is set to the size of the following <tt class="docutils literal"><span class="pre">Block</span></tt> literal
+structure.</p>
+<p>c. The <tt class="docutils literal"><span class="pre">copy_helper</span></tt> and <tt class="docutils literal"><span class="pre">dispose_helper</span></tt> function pointers are set to
+respective helper functions if they are required by the <tt class="docutils literal"><span class="pre">Block</span></tt> literal.</p>
+</div></blockquote>
+<ol class="arabic" start="2">
+<li><p class="first">A stack (or global) <tt class="docutils literal"><span class="pre">Block</span></tt> literal data structure is created and
+initialized as follows:</p>
+<p>a. The <tt class="docutils literal"><span class="pre">isa</span></tt> field is set to the address of the external
+<tt class="docutils literal"><span class="pre">_NSConcreteStackBlock</span></tt>, which is a block of uninitialized memory supplied
+in <tt class="docutils literal"><span class="pre">libSystem</span></tt>, or <tt class="docutils literal"><span class="pre">_NSConcreteGlobalBlock</span></tt> if this is a static or file
+level <tt class="docutils literal"><span class="pre">Block</span></tt> literal.</p>
+<p>b. The <tt class="docutils literal"><span class="pre">flags</span></tt> field is set to zero unless there are variables imported
+into the <tt class="docutils literal"><span class="pre">Block</span></tt> that need helper functions for program level
+<tt class="docutils literal"><span class="pre">Block_copy()</span></tt> and <tt class="docutils literal"><span class="pre">Block_release()</span></tt> operations, in which case the
+(1<<25) flags bit is set.</p>
+</li>
+</ol>
+<p>As an example, the <tt class="docutils literal"><span class="pre">Block</span></tt> literal expression:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="o">^</span> <span class="p">{</span> <span class="n">printf</span><span class="p">(</span><span class="s">"hello world</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>would cause the following to be created on a 32-bit system:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_1</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">invoke</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_1</span> <span class="o">*</span><span class="p">);</span>
+ <span class="k">struct</span> <span class="n">__block_descriptor_1</span> <span class="o">*</span><span class="n">descriptor</span><span class="p">;</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">__block_invoke_1</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_1</span> <span class="o">*</span><span class="n">_block</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">printf</span><span class="p">(</span><span class="s">"hello world</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="k">static</span> <span class="k">struct</span> <span class="n">__block_descriptor_1</span> <span class="p">{</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">Block_size</span><span class="p">;</span>
+<span class="p">}</span> <span class="n">__block_descriptor_1</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_1</span><span class="p">),</span> <span class="n">__block_invoke_1</span> <span class="p">};</span>
+</pre></div>
+</div>
+<p>and where the <tt class="docutils literal"><span class="pre">Block</span></tt> literal itself appears:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_1</span> <span class="n">_block_literal</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="o">&</span><span class="n">_NSConcreteStackBlock</span><span class="p">,</span>
+ <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">),</span> <span class="o"><</span><span class="n">uninitialized</span><span class="o">></span><span class="p">,</span>
+ <span class="n">__block_invoke_1</span><span class="p">,</span>
+ <span class="o">&</span><span class="n">__block_descriptor_1</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>A <tt class="docutils literal"><span class="pre">Block</span></tt> imports other <tt class="docutils literal"><span class="pre">Block</span></tt> references, <tt class="docutils literal"><span class="pre">const</span></tt> copies of other
+variables, and variables marked <tt class="docutils literal"><span class="pre">__block</span></tt>. In Objective-C, variables may
+additionally be objects.</p>
+<p>When a <tt class="docutils literal"><span class="pre">Block</span></tt> literal expression is used as the initial value of a global
+or <tt class="docutils literal"><span class="pre">static</span></tt> local variable, it is initialized as follows:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_1</span> <span class="n">__block_literal_1</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="o">&</span><span class="n">_NSConcreteGlobalBlock</span><span class="p">,</span>
+ <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">28</span><span class="p">)</span><span class="o">|</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">),</span> <span class="o"><</span><span class="n">uninitialized</span><span class="o">></span><span class="p">,</span>
+ <span class="n">__block_invoke_1</span><span class="p">,</span>
+ <span class="o">&</span><span class="n">__block_descriptor_1</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>that is, a different address is provided as the first value and a particular
+(1<<28) bit is set in the <tt class="docutils literal"><span class="pre">flags</span></tt> field, and otherwise it is the same as for
+stack based <tt class="docutils literal"><span class="pre">Block</span></tt> literals. This is an optimization that can be used for
+any <tt class="docutils literal"><span class="pre">Block</span></tt> literal that imports no <tt class="docutils literal"><span class="pre">const</span></tt> or <tt class="docutils literal"><span class="pre">__block</span></tt> storage
+variables.</p>
+</div>
+<div class="section" id="imported-variables">
+<h2><a class="toc-backref" href="#id3">Imported Variables</a><a class="headerlink" href="#imported-variables" title="Permalink to this headline">¶</a></h2>
+<p>Variables of <tt class="docutils literal"><span class="pre">auto</span></tt> storage class are imported as <tt class="docutils literal"><span class="pre">const</span></tt> copies. Variables
+of <tt class="docutils literal"><span class="pre">__block</span></tt> storage class are imported as a pointer to an enclosing data
+structure. Global variables are simply referenced and not considered as
+imported.</p>
+<div class="section" id="imported-const-copy-variables">
+<h3><a class="toc-backref" href="#id4">Imported <tt class="docutils literal"><span class="pre">const</span></tt> copy variables</a><a class="headerlink" href="#imported-const-copy-variables" title="Permalink to this headline">¶</a></h3>
+<p>Automatic storage variables not marked with <tt class="docutils literal"><span class="pre">__block</span></tt> are imported as
+<tt class="docutils literal"><span class="pre">const</span></tt> copies.</p>
+<p>The simplest example is that of importing a variable of type <tt class="docutils literal"><span class="pre">int</span></tt>:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="n">x</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span>
+<span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">vv</span><span class="p">)(</span><span class="kt">void</span><span class="p">)</span> <span class="o">=</span> <span class="o">^</span><span class="p">{</span> <span class="n">printf</span><span class="p">(</span><span class="s">"x is %d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">x</span><span class="p">);</span> <span class="p">}</span>
+<span class="n">x</span> <span class="o">=</span> <span class="mi">11</span><span class="p">;</span>
+<span class="n">vv</span><span class="p">();</span>
+</pre></div>
+</div>
+<p>which would be compiled to:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_2</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">invoke</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_2</span> <span class="o">*</span><span class="p">);</span>
+ <span class="k">struct</span> <span class="n">__block_descriptor_2</span> <span class="o">*</span><span class="n">descriptor</span><span class="p">;</span>
+ <span class="k">const</span> <span class="kt">int</span> <span class="n">x</span><span class="p">;</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">__block_invoke_2</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_2</span> <span class="o">*</span><span class="n">_block</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">printf</span><span class="p">(</span><span class="s">"x is %d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">_block</span><span class="o">-></span><span class="n">x</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="k">static</span> <span class="k">struct</span> <span class="n">__block_descriptor_2</span> <span class="p">{</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">Block_size</span><span class="p">;</span>
+<span class="p">}</span> <span class="n">__block_descriptor_2</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_2</span><span class="p">)</span> <span class="p">};</span>
+</pre></div>
+</div>
+<p>and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_2</span> <span class="n">__block_literal_2</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="o">&</span><span class="n">_NSConcreteStackBlock</span><span class="p">,</span>
+ <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">),</span> <span class="o"><</span><span class="n">uninitialized</span><span class="o">></span><span class="p">,</span>
+ <span class="n">__block_invoke_2</span><span class="p">,</span>
+ <span class="o">&</span><span class="n">__block_descriptor_2</span><span class="p">,</span>
+ <span class="n">x</span>
+ <span class="p">};</span>
+</pre></div>
+</div>
+<p>In summary, scalars, structures, unions, and function pointers are generally
+imported as <tt class="docutils literal"><span class="pre">const</span></tt> copies with no need for helper functions.</p>
+</div>
+<div class="section" id="imported-const-copy-of-block-reference">
+<h3><a class="toc-backref" href="#id5">Imported <tt class="docutils literal"><span class="pre">const</span></tt> copy of <tt class="docutils literal"><span class="pre">Block</span></tt> reference</a><a class="headerlink" href="#imported-const-copy-of-block-reference" title="Permalink to this headline">¶</a></h3>
+<p>The first case where copy and dispose helper functions are required is for the
+case of when a <tt class="docutils literal"><span class="pre">Block</span></tt> itself is imported. In this case both a
+<tt class="docutils literal"><span class="pre">copy_helper</span></tt> function and a <tt class="docutils literal"><span class="pre">dispose_helper</span></tt> function are needed. The
+<tt class="docutils literal"><span class="pre">copy_helper</span></tt> function is passed both the existing stack based pointer and the
+pointer to the new heap version and should call back into the runtime to
+actually do the copy operation on the imported fields within the <tt class="docutils literal"><span class="pre">Block</span></tt>. The
+runtime functions are all described in <a class="reference internal" href="#runtimehelperfunctions"><em>Runtime Helper Functions</em></a>.</p>
+<p>A quick example:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">existingBlock</span><span class="p">)(</span><span class="kt">void</span><span class="p">)</span> <span class="o">=</span> <span class="p">...;</span>
+<span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">vv</span><span class="p">)(</span><span class="kt">void</span><span class="p">)</span> <span class="o">=</span> <span class="o">^</span><span class="p">{</span> <span class="n">existingBlock</span><span class="p">();</span> <span class="p">}</span>
+<span class="n">vv</span><span class="p">();</span>
+
+<span class="k">struct</span> <span class="n">__block_literal_3</span> <span class="p">{</span>
+ <span class="p">...;</span> <span class="c1">// existing block</span>
+<span class="p">};</span>
+
+<span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">invoke</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="o">*</span><span class="p">);</span>
+ <span class="k">struct</span> <span class="n">__block_literal_3</span> <span class="o">*</span><span class="k">const</span> <span class="n">existingBlock</span><span class="p">;</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">__block_invoke_4</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_2</span> <span class="o">*</span><span class="n">_block</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">__block</span><span class="o">-></span><span class="n">existingBlock</span><span class="o">-></span><span class="n">invoke</span><span class="p">(</span><span class="n">__block</span><span class="o">-></span><span class="n">existingBlock</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_copy_4</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_copy_assign(&dst->existingBlock, src->existingBlock, 0);</span>
+ <span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">existingBlock</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">existingBlock</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BLOCK</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_dispose_4</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">// was _Block_destroy</span>
+ <span class="n">_Block_object_dispose</span><span class="p">(</span><span class="n">src</span><span class="o">-></span><span class="n">existingBlock</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BLOCK</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="k">static</span> <span class="k">struct</span> <span class="n">__block_descriptor_4</span> <span class="p">{</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">Block_size</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">copy_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">dispose_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="o">*</span><span class="p">);</span>
+<span class="p">}</span> <span class="n">__block_descriptor_4</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="mi">0</span><span class="p">,</span>
+ <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_4</span><span class="p">),</span>
+ <span class="n">__block_copy_4</span><span class="p">,</span>
+ <span class="n">__block_dispose_4</span><span class="p">,</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>and where said <tt class="docutils literal"><span class="pre">Block</span></tt> is used:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_4</span> <span class="n">_block_literal</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="o">&</span><span class="n">_NSConcreteStackBlock</span><span class="p">,</span>
+ <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">25</span><span class="p">)</span><span class="o">|</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">),</span> <span class="o"><</span><span class="n">uninitialized</span><span class="o">></span>
+ <span class="n">__block_invoke_4</span><span class="p">,</span>
+ <span class="o">&</span> <span class="n">__block_descriptor_4</span>
+ <span class="n">existingBlock</span><span class="p">,</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<div class="section" id="importing-attribute-nsobject-variables">
+<h4><a class="toc-backref" href="#id6">Importing <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> variables</a><a class="headerlink" href="#importing-attribute-nsobject-variables" title="Permalink to this headline">¶</a></h4>
+<p>GCC introduces <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> on structure pointers to mean “this
+is an object”. This is useful because many low level data structures are
+declared as opaque structure pointers, e.g. <tt class="docutils literal"><span class="pre">CFStringRef</span></tt>, <tt class="docutils literal"><span class="pre">CFArrayRef</span></tt>,
+etc. When used from C, however, these are still really objects and are the
+second case where that requires copy and dispose helper functions to be
+generated. The copy helper functions generated by the compiler should use the
+<tt class="docutils literal"><span class="pre">_Block_object_assign</span></tt> runtime helper function and in the dispose helper the
+<tt class="docutils literal"><span class="pre">_Block_object_dispose</span></tt> runtime helper function should be called.</p>
+<p>For example, <tt class="docutils literal"><span class="pre">Block</span></tt> foo in the following:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">Opaque</span> <span class="o">*</span><span class="n">__attribute__</span><span class="p">((</span><span class="n">NSObject</span><span class="p">))</span> <span class="n">objectPointer</span> <span class="o">=</span> <span class="p">...;</span>
+<span class="p">...</span>
+<span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">foo</span><span class="p">)(</span><span class="kt">void</span><span class="p">)</span> <span class="o">=</span> <span class="o">^</span><span class="p">{</span> <span class="n">CFPrint</span><span class="p">(</span><span class="n">objectPointer</span><span class="p">);</span> <span class="p">};</span>
+</pre></div>
+</div>
+<p>would have the following helper functions generated:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">__block_copy_foo</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">objectPointer</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span> <span class="n">objectPointer</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_OBJECT</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_dispose_foo</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">_Block_object_dispose</span><span class="p">(</span><span class="n">src</span><span class="o">-></span><span class="n">objectPointer</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_OBJECT</span><span class="p">);</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="imported-block-marked-variables">
+<h3><a class="toc-backref" href="#id7">Imported <tt class="docutils literal"><span class="pre">__block</span></tt> marked variables</a><a class="headerlink" href="#imported-block-marked-variables" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="layout-of-block-marked-variables">
+<h4><a class="toc-backref" href="#id8">Layout of <tt class="docutils literal"><span class="pre">__block</span></tt> marked variables</a><a class="headerlink" href="#layout-of-block-marked-variables" title="Permalink to this headline">¶</a></h4>
+<p>The compiler must embed variables that are marked <tt class="docutils literal"><span class="pre">__block</span></tt> in a specialized
+structure of the form:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_foo</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="k">struct</span> <span class="n">Block_byref</span> <span class="o">*</span><span class="n">forwarding</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span> <span class="c1">//refcount;</span>
+ <span class="kt">int</span> <span class="n">size</span><span class="p">;</span>
+ <span class="n">typeof</span><span class="p">(</span><span class="n">marked_variable</span><span class="p">)</span> <span class="n">marked_variable</span><span class="p">;</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>Variables of certain types require helper functions for when <tt class="docutils literal"><span class="pre">Block_copy()</span></tt>
+and <tt class="docutils literal"><span class="pre">Block_release()</span></tt> are performed upon a referencing <tt class="docutils literal"><span class="pre">Block</span></tt>. At the “C”
+level only variables that are of type <tt class="docutils literal"><span class="pre">Block</span></tt> or ones that have
+<tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> marked require helper functions. In Objective-C
+objects require helper functions and in C++ stack based objects require helper
+functions. Variables that require helper functions use the form:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_foo</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="k">struct</span> <span class="n">_block_byref_foo</span> <span class="o">*</span><span class="n">forwarding</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span> <span class="c1">//refcount;</span>
+ <span class="kt">int</span> <span class="n">size</span><span class="p">;</span>
+ <span class="c1">// helper functions called via Block_copy() and Block_release()</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_keep</span><span class="p">)(</span><span class="kt">void</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="kt">void</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_dispose</span><span class="p">)(</span><span class="kt">void</span> <span class="o">*</span><span class="p">);</span>
+ <span class="n">typeof</span><span class="p">(</span><span class="n">marked_variable</span><span class="p">)</span> <span class="n">marked_variable</span><span class="p">;</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>The structure is initialized such that:</p>
+<blockquote>
+<div><p>a. The <tt class="docutils literal"><span class="pre">forwarding</span></tt> pointer is set to the beginning of its enclosing
+structure.</p>
+<p>b. The <tt class="docutils literal"><span class="pre">size</span></tt> field is initialized to the total size of the enclosing
+structure.</p>
+<p>c. The <tt class="docutils literal"><span class="pre">flags</span></tt> field is set to either 0 if no helper functions are needed
+or (1<<25) if they are.</p>
+<ol class="loweralpha simple" start="4">
+<li>The helper functions are initialized (if present).</li>
+<li>The variable itself is set to its initial value.</li>
+<li>The <tt class="docutils literal"><span class="pre">isa</span></tt> field is set to <tt class="docutils literal"><span class="pre">NULL</span></tt>.</li>
+</ol>
+</div></blockquote>
+</div>
+<div class="section" id="access-to-block-variables-from-within-its-lexical-scope">
+<h4><a class="toc-backref" href="#id9">Access to <tt class="docutils literal"><span class="pre">__block</span></tt> variables from within its lexical scope</a><a class="headerlink" href="#access-to-block-variables-from-within-its-lexical-scope" title="Permalink to this headline">¶</a></h4>
+<p>In order to “move” the variable to the heap upon a <tt class="docutils literal"><span class="pre">copy_helper</span></tt> operation the
+compiler must rewrite access to such a variable to be indirect through the
+structures <tt class="docutils literal"><span class="pre">forwarding</span></tt> pointer. For example:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="n">__block</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span>
+<span class="n">i</span> <span class="o">=</span> <span class="mi">11</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>would be rewritten to be:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="n">forwarding</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span> <span class="c1">//refcount;</span>
+ <span class="kt">int</span> <span class="n">size</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">captured_i</span><span class="p">;</span>
+<span class="p">}</span> <span class="n">i</span> <span class="o">=</span> <span class="p">{</span> <span class="nb">NULL</span><span class="p">,</span> <span class="o">&</span><span class="n">i</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_i</span><span class="p">),</span> <span class="mi">10</span> <span class="p">};</span>
+
+<span class="n">i</span><span class="p">.</span><span class="n">forwarding</span><span class="o">-></span><span class="n">captured_i</span> <span class="o">=</span> <span class="mi">11</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>In the case of a <tt class="docutils literal"><span class="pre">Block</span></tt> reference variable being marked <tt class="docutils literal"><span class="pre">__block</span></tt> the
+helper code generated must use the <tt class="docutils literal"><span class="pre">_Block_object_assign</span></tt> and
+<tt class="docutils literal"><span class="pre">_Block_object_dispose</span></tt> routines supplied by the runtime to make the
+copies. For example:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">__block</span> <span class="kt">void</span> <span class="p">(</span><span class="n">voidBlock</span><span class="p">)(</span><span class="kt">void</span><span class="p">)</span> <span class="o">=</span> <span class="n">blockA</span><span class="p">;</span>
+<span class="n">voidBlock</span> <span class="o">=</span> <span class="n">blockB</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>would translate into:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">forwarding</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span> <span class="c1">//refcount;</span>
+ <span class="kt">int</span> <span class="n">size</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_keep</span><span class="p">)(</span><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_dispose</span><span class="p">)(</span><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">captured_voidBlock</span><span class="p">)(</span><span class="kt">void</span><span class="p">);</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">_block_byref_keep_helper</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_copy_assign(&dst->captured_voidBlock, src->captured_voidBlock, 0);</span>
+ <span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">captured_voidBlock</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">captured_voidBlock</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BLOCK</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">_block_byref_dispose_helper</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">param</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_destroy(param->captured_voidBlock, 0);</span>
+ <span class="n">_Block_object_dispose</span><span class="p">(</span><span class="n">param</span><span class="o">-></span><span class="n">captured_voidBlock</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BLOCK</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">)}</span>
+</pre></div>
+</div>
+<p>and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="n">voidBlock</span> <span class="o">=</span> <span class="p">{(</span> <span class="p">.</span><span class="n">forwarding</span><span class="o">=&</span><span class="n">voidBlock</span><span class="p">,</span> <span class="p">.</span><span class="n">flags</span><span class="o">=</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">25</span><span class="p">),</span> <span class="p">.</span><span class="n">size</span><span class="o">=</span><span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="p">),</span>
+ <span class="p">.</span><span class="n">byref_keep</span><span class="o">=</span><span class="n">_block_byref_keep_helper</span><span class="p">,</span> <span class="p">.</span><span class="n">byref_dispose</span><span class="o">=</span><span class="n">_block_byref_dispose_helper</span><span class="p">,</span>
+ <span class="p">.</span><span class="n">captured_voidBlock</span><span class="o">=</span><span class="n">blockA</span> <span class="p">)};</span>
+
+<span class="n">voidBlock</span><span class="p">.</span><span class="n">forwarding</span><span class="o">-></span><span class="n">captured_voidBlock</span> <span class="o">=</span> <span class="n">blockB</span><span class="p">;</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="importing-block-variables-into-blocks">
+<h4><a class="toc-backref" href="#id10">Importing <tt class="docutils literal"><span class="pre">__block</span></tt> variables into <tt class="docutils literal"><span class="pre">Blocks</span></tt></a><a class="headerlink" href="#importing-block-variables-into-blocks" title="Permalink to this headline">¶</a></h4>
+<p>A <tt class="docutils literal"><span class="pre">Block</span></tt> that uses a <tt class="docutils literal"><span class="pre">__block</span></tt> variable in its compound statement body must
+import the variable and emit <tt class="docutils literal"><span class="pre">copy_helper</span></tt> and <tt class="docutils literal"><span class="pre">dispose_helper</span></tt> helper
+functions that, in turn, call back into the runtime to actually copy or release
+the <tt class="docutils literal"><span class="pre">byref</span></tt> data block using the functions <tt class="docutils literal"><span class="pre">_Block_object_assign</span></tt> and
+<tt class="docutils literal"><span class="pre">_Block_object_dispose</span></tt>.</p>
+<p>For example:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="n">__block</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">2</span><span class="p">;</span>
+<span class="n">functioncall</span><span class="p">(</span><span class="o">^</span><span class="p">{</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span> <span class="p">});</span>
+</pre></div>
+</div>
+<p>would translate to:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span> <span class="c1">// set to NULL</span>
+ <span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">forwarding</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span> <span class="c1">//refcount;</span>
+ <span class="kt">int</span> <span class="n">size</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_keep</span><span class="p">)(</span><span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_dispose</span><span class="p">)(</span><span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="p">);</span>
+ <span class="kt">int</span> <span class="n">captured_i</span><span class="p">;</span>
+<span class="p">};</span>
+
+
+<span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">invoke</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="p">);</span>
+ <span class="k">struct</span> <span class="n">__block_descriptor_5</span> <span class="o">*</span><span class="n">descriptor</span><span class="p">;</span>
+ <span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="n">i_holder</span><span class="p">;</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">__block_invoke_5</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">_block</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">_block</span><span class="o">-></span><span class="n">forwarding</span><span class="o">-></span><span class="n">captured_i</span> <span class="o">=</span> <span class="mi">10</span><span class="p">;</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_copy_5</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_byref_assign_copy(&dst->captured_i, src->captured_i);</span>
+ <span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">captured_i</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">captured_i</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BYREF</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_dispose_5</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_byref_release(src->captured_i);</span>
+ <span class="n">_Block_object_dispose</span><span class="p">(</span><span class="n">src</span><span class="o">-></span><span class="n">captured_i</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BYREF</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="k">static</span> <span class="k">struct</span> <span class="n">__block_descriptor_5</span> <span class="p">{</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">Block_size</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">copy_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">dispose_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="p">);</span>
+<span class="p">}</span> <span class="n">__block_descriptor_5</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span><span class="p">)</span> <span class="n">__block_copy_5</span><span class="p">,</span> <span class="n">__block_dispose_5</span> <span class="p">};</span>
+</pre></div>
+</div>
+<p>and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="n">i</span> <span class="o">=</span> <span class="p">{(</span> <span class="p">.</span><span class="n">forwarding</span><span class="o">=&</span><span class="n">i</span><span class="p">,</span> <span class="p">.</span><span class="n">flags</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="p">.</span><span class="n">size</span><span class="o">=</span><span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_i</span><span class="p">)</span> <span class="p">)};</span>
+<span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="n">_block_literal</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="o">&</span><span class="n">_NSConcreteStackBlock</span><span class="p">,</span>
+ <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">25</span><span class="p">)</span><span class="o">|</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">),</span> <span class="o"><</span><span class="n">uninitialized</span><span class="o">></span><span class="p">,</span>
+ <span class="n">__block_invoke_5</span><span class="p">,</span>
+ <span class="o">&</span><span class="n">__block_descriptor_5</span><span class="p">,</span>
+ <span class="mi">2</span><span class="p">,</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="importing-attribute-nsobject-block-variables">
+<h4><a class="toc-backref" href="#id11">Importing <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> <tt class="docutils literal"><span class="pre">__block</span></tt> variables</a><a class="headerlink" href="#importing-attribute-nsobject-block-variables" title="Permalink to this headline">¶</a></h4>
+<p>A <tt class="docutils literal"><span class="pre">__block</span></tt> variable that is also marked <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> should
+have <tt class="docutils literal"><span class="pre">byref_keep</span></tt> and <tt class="docutils literal"><span class="pre">byref_dispose</span></tt> helper functions that use
+<tt class="docutils literal"><span class="pre">_Block_object_assign</span></tt> and <tt class="docutils literal"><span class="pre">_Block_object_dispose</span></tt>.</p>
+</div>
+<div class="section" id="block-escapes">
+<h4><a class="toc-backref" href="#id12"><tt class="docutils literal"><span class="pre">__block</span></tt> escapes</a><a class="headerlink" href="#block-escapes" title="Permalink to this headline">¶</a></h4>
+<p>Because <tt class="docutils literal"><span class="pre">Blocks</span></tt> referencing <tt class="docutils literal"><span class="pre">__block</span></tt> variables may have <tt class="docutils literal"><span class="pre">Block_copy()</span></tt>
+performed upon them the underlying storage for the variables may move to the
+heap. In Objective-C Garbage Collection Only compilation environments the heap
+used is the garbage collected one and no further action is required. Otherwise
+the compiler must issue a call to potentially release any heap storage for
+<tt class="docutils literal"><span class="pre">__block</span></tt> variables at all escapes or terminations of their scope. The call
+should be:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">_Block_object_dispose</span><span class="p">(</span><span class="o">&</span><span class="n">_block_byref_foo</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BYREF</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="nesting">
+<h4><a class="toc-backref" href="#id13">Nesting</a><a class="headerlink" href="#nesting" title="Permalink to this headline">¶</a></h4>
+<p><tt class="docutils literal"><span class="pre">Blocks</span></tt> may contain <tt class="docutils literal"><span class="pre">Block</span></tt> literal expressions. Any variables used within
+inner blocks are imported into all enclosing <tt class="docutils literal"><span class="pre">Block</span></tt> scopes even if the
+variables are not used. This includes <tt class="docutils literal"><span class="pre">const</span></tt> imports as well as <tt class="docutils literal"><span class="pre">__block</span></tt>
+variables.</p>
+</div>
+</div>
+</div>
+<div class="section" id="objective-c-extensions-to-blocks">
+<h2><a class="toc-backref" href="#id14">Objective C Extensions to <tt class="docutils literal"><span class="pre">Blocks</span></tt></a><a class="headerlink" href="#objective-c-extensions-to-blocks" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="importing-objects">
+<h3><a class="toc-backref" href="#id15">Importing Objects</a><a class="headerlink" href="#importing-objects" title="Permalink to this headline">¶</a></h3>
+<p>Objects should be treated as <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> variables; all
+<tt class="docutils literal"><span class="pre">copy_helper</span></tt>, <tt class="docutils literal"><span class="pre">dispose_helper</span></tt>, <tt class="docutils literal"><span class="pre">byref_keep</span></tt>, and <tt class="docutils literal"><span class="pre">byref_dispose</span></tt>
+helper functions should use <tt class="docutils literal"><span class="pre">_Block_object_assign</span></tt> and
+<tt class="docutils literal"><span class="pre">_Block_object_dispose</span></tt>. There should be no code generated that uses
+<tt class="docutils literal"><span class="pre">*-retain</span></tt> or <tt class="docutils literal"><span class="pre">*-release</span></tt> methods.</p>
+</div>
+<div class="section" id="blocks-as-objects">
+<h3><a class="toc-backref" href="#id16"><tt class="docutils literal"><span class="pre">Blocks</span></tt> as Objects</a><a class="headerlink" href="#blocks-as-objects" title="Permalink to this headline">¶</a></h3>
+<p>The compiler will treat <tt class="docutils literal"><span class="pre">Blocks</span></tt> as objects when synthesizing property setters
+and getters, will characterize them as objects when generating garbage
+collection strong and weak layout information in the same manner as objects, and
+will issue strong and weak write-barrier assignments in the same manner as
+objects.</p>
+</div>
+<div class="section" id="weak-block-support">
+<h3><a class="toc-backref" href="#id17"><tt class="docutils literal"><span class="pre">__weak</span> <span class="pre">__block</span></tt> Support</a><a class="headerlink" href="#weak-block-support" title="Permalink to this headline">¶</a></h3>
+<p>Objective-C (and Objective-C++) support the <tt class="docutils literal"><span class="pre">__weak</span></tt> attribute on <tt class="docutils literal"><span class="pre">__block</span></tt>
+variables. Under normal circumstances the compiler uses the Objective-C runtime
+helper support functions <tt class="docutils literal"><span class="pre">objc_assign_weak</span></tt> and <tt class="docutils literal"><span class="pre">objc_read_weak</span></tt>. Both
+should continue to be used for all reads and writes of <tt class="docutils literal"><span class="pre">__weak</span> <span class="pre">__block</span></tt>
+variables:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">objc_read_weak</span><span class="p">(</span><span class="o">&</span><span class="n">block</span><span class="o">-></span><span class="n">byref_i</span><span class="o">-></span><span class="n">forwarding</span><span class="o">-></span><span class="n">i</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>The <tt class="docutils literal"><span class="pre">__weak</span></tt> variable is stored in a <tt class="docutils literal"><span class="pre">_block_byref_foo</span></tt> structure and the
+<tt class="docutils literal"><span class="pre">Block</span></tt> has copy and dispose helpers for this structure that call:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dest</span><span class="o">-></span><span class="n">_block_byref_i</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span> <span class="n">_block_byref_i</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_WEAK</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_BYREF</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">_Block_object_dispose</span><span class="p">(</span><span class="n">src</span><span class="o">-></span><span class="n">_block_byref_i</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_WEAK</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_BYREF</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>In turn, the <tt class="docutils literal"><span class="pre">block_byref</span></tt> copy support helpers distinguish between whether
+the <tt class="docutils literal"><span class="pre">__block</span></tt> variable is a <tt class="docutils literal"><span class="pre">Block</span></tt> or not and should either call:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dest</span><span class="o">-></span><span class="n">_block_byref_i</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">_block_byref_i</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_WEAK</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_OBJECT</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>for something declared as an object or:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dest</span><span class="o">-></span><span class="n">_block_byref_i</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">_block_byref_i</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_WEAK</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_BLOCK</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>for something declared as a <tt class="docutils literal"><span class="pre">Block</span></tt>.</p>
+<p>A full example follows:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">__block</span> <span class="n">__weak</span> <span class="n">id</span> <span class="n">obj</span> <span class="o">=</span> <span class="o"><</span><span class="n">initialization</span> <span class="n">expression</span><span class="o">></span><span class="p">;</span>
+<span class="n">functioncall</span><span class="p">(</span><span class="o">^</span><span class="p">{</span> <span class="p">[</span><span class="n">obj</span> <span class="n">somemessage</span><span class="p">];</span> <span class="p">});</span>
+</pre></div>
+</div>
+<p>would translate to:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">_block_byref_obj</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span> <span class="c1">// uninitialized</span>
+ <span class="k">struct</span> <span class="n">_block_byref_obj</span> <span class="o">*</span><span class="n">forwarding</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span> <span class="c1">//refcount;</span>
+ <span class="kt">int</span> <span class="n">size</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_keep</span><span class="p">)(</span><span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">byref_dispose</span><span class="p">)(</span><span class="k">struct</span> <span class="n">_block_byref_i</span> <span class="o">*</span><span class="p">);</span>
+ <span class="n">id</span> <span class="n">captured_obj</span><span class="p">;</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">_block_byref_obj_keep</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_copy_assign(&dst->captured_obj, src->captured_obj, 0);</span>
+ <span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">captured_obj</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">captured_obj</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_OBJECT</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_WEAK</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">_block_byref_obj_dispose</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_voidBlock</span> <span class="o">*</span><span class="n">param</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_destroy(param->captured_obj, 0);</span>
+ <span class="n">_Block_object_dispose</span><span class="p">(</span><span class="n">param</span><span class="o">-></span><span class="n">captured_obj</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_OBJECT</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_WEAK</span> <span class="o">|</span> <span class="n">BLOCK_BYREF_CALLER</span><span class="p">);</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>for the block <tt class="docutils literal"><span class="pre">byref</span></tt> part and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">invoke</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="p">);</span>
+ <span class="k">struct</span> <span class="n">__block_descriptor_5</span> <span class="o">*</span><span class="n">descriptor</span><span class="p">;</span>
+ <span class="k">struct</span> <span class="n">_block_byref_obj</span> <span class="o">*</span><span class="n">byref_obj</span><span class="p">;</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">__block_invoke_5</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">_block</span><span class="p">)</span> <span class="p">{</span>
+ <span class="p">[</span><span class="n">objc_read_weak</span><span class="p">(</span><span class="o">&</span><span class="n">_block</span><span class="o">-></span><span class="n">byref_obj</span><span class="o">-></span><span class="n">forwarding</span><span class="o">-></span><span class="n">captured_obj</span><span class="p">)</span> <span class="n">somemessage</span><span class="p">];</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_copy_5</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_byref_assign_copy(&dst->byref_obj, src->byref_obj);</span>
+ <span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">byref_obj</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">byref_obj</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BYREF</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_WEAK</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_dispose_5</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="c1">//_Block_byref_release(src->byref_obj);</span>
+ <span class="n">_Block_object_dispose</span><span class="p">(</span><span class="n">src</span><span class="o">-></span><span class="n">byref_obj</span><span class="p">,</span> <span class="n">BLOCK_FIELD_IS_BYREF</span> <span class="o">|</span> <span class="n">BLOCK_FIELD_IS_WEAK</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="k">static</span> <span class="k">struct</span> <span class="n">__block_descriptor_5</span> <span class="p">{</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">Block_size</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">copy_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">dispose_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_5</span> <span class="o">*</span><span class="p">);</span>
+<span class="p">}</span> <span class="n">__block_descriptor_5</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_5</span><span class="p">),</span> <span class="n">__block_copy_5</span><span class="p">,</span> <span class="n">__block_dispose_5</span> <span class="p">};</span>
+</pre></div>
+</div>
+<p>and within the compound statement:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">truct</span> <span class="n">_block_byref_obj</span> <span class="n">obj</span> <span class="o">=</span> <span class="p">{(</span> <span class="p">.</span><span class="n">forwarding</span><span class="o">=&</span><span class="n">obj</span><span class="p">,</span> <span class="p">.</span><span class="n">flags</span><span class="o">=</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">25</span><span class="p">),</span> <span class="p">.</span><span class="n">size</span><span class="o">=</span><span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_obj</span><span class="p">),</span>
+ <span class="p">.</span><span class="n">byref_keep</span><span class="o">=</span><span class="n">_block_byref_obj_keep</span><span class="p">,</span> <span class="p">.</span><span class="n">byref_dispose</span><span class="o">=</span><span class="n">_block_byref_obj_dispose</span><span class="p">,</span>
+ <span class="p">.</span><span class="n">captured_obj</span> <span class="o">=</span> <span class="o"><</span><span class="n">initialization</span> <span class="n">expression</span><span class="o">></span> <span class="p">)};</span>
+
+<span class="n">truct</span> <span class="n">__block_literal_5</span> <span class="n">_block_literal</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="o">&</span><span class="n">_NSConcreteStackBlock</span><span class="p">,</span>
+ <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">25</span><span class="p">)</span><span class="o">|</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">),</span> <span class="o"><</span><span class="n">uninitialized</span><span class="o">></span><span class="p">,</span>
+ <span class="n">__block_invoke_5</span><span class="p">,</span>
+ <span class="o">&</span><span class="n">__block_descriptor_5</span><span class="p">,</span>
+ <span class="o">&</span><span class="n">obj</span><span class="p">,</span> <span class="c1">// a reference to the on-stack structure containing "captured_obj"</span>
+<span class="p">};</span>
+
+
+<span class="n">functioncall</span><span class="p">(</span><span class="n">_block_literal</span><span class="o">-></span><span class="n">invoke</span><span class="p">(</span><span class="o">&</span><span class="n">_block_literal</span><span class="p">));</span>
+</pre></div>
+</div>
+</div>
+</div>
+<div class="section" id="c-support">
+<h2><a class="toc-backref" href="#id18">C++ Support</a><a class="headerlink" href="#c-support" title="Permalink to this headline">¶</a></h2>
+<p>Within a block stack based C++ objects are copied into <tt class="docutils literal"><span class="pre">const</span></tt> copies using
+the copy constructor. It is an error if a stack based C++ object is used within
+a block if it does not have a copy constructor. In addition both copy and
+destroy helper routines must be synthesized for the block to support the
+<tt class="docutils literal"><span class="pre">Block_copy()</span></tt> operation, and the flags work marked with the (1<<26) bit in
+addition to the (1<<25) bit. The copy helper should call the constructor using
+appropriate offsets of the variable within the supplied stack based block source
+and heap based destination for all <tt class="docutils literal"><span class="pre">const</span></tt> constructed copies, and similarly
+should call the destructor in the destroy routine.</p>
+<p>As an example, suppose a C++ class <tt class="docutils literal"><span class="pre">FOO</span></tt> existed with a copy constructor.
+Within a code block a stack version of a <tt class="docutils literal"><span class="pre">FOO</span></tt> object is declared and used
+within a <tt class="docutils literal"><span class="pre">Block</span></tt> literal expression:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="p">{</span>
+ <span class="n">FOO</span> <span class="n">foo</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">block</span><span class="p">)(</span><span class="kt">void</span><span class="p">)</span> <span class="o">=</span> <span class="o">^</span><span class="p">{</span> <span class="n">printf</span><span class="p">(</span><span class="s">"%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">foo</span><span class="p">.</span><span class="n">value</span><span class="p">());</span> <span class="p">};</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>The compiler would synthesize:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="p">{</span>
+ <span class="kt">void</span> <span class="o">*</span><span class="n">isa</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">flags</span><span class="p">;</span>
+ <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">invoke</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="p">);</span>
+ <span class="k">struct</span> <span class="n">__block_descriptor_10</span> <span class="o">*</span><span class="n">descriptor</span><span class="p">;</span>
+ <span class="k">const</span> <span class="n">FOO</span> <span class="n">foo</span><span class="p">;</span>
+<span class="p">};</span>
+
+<span class="kt">void</span> <span class="nf">__block_invoke_10</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="n">_block</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">printf</span><span class="p">(</span><span class="s">"%d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">_block</span><span class="o">-></span><span class="n">foo</span><span class="p">.</span><span class="n">value</span><span class="p">());</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_literal_10</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">FOO_ctor</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">foo</span><span class="p">,</span> <span class="o">&</span><span class="n">src</span><span class="o">-></span><span class="n">foo</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">__block_dispose_10</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">FOO_dtor</span><span class="p">(</span><span class="o">&</span><span class="n">src</span><span class="o">-></span><span class="n">foo</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="k">static</span> <span class="k">struct</span> <span class="n">__block_descriptor_10</span> <span class="p">{</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">reserved</span><span class="p">;</span>
+ <span class="kt">unsigned</span> <span class="kt">long</span> <span class="kt">int</span> <span class="n">Block_size</span><span class="p">;</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">copy_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="n">src</span><span class="p">);</span>
+ <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">dispose_helper</span><span class="p">)(</span><span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">*</span><span class="p">);</span>
+<span class="p">}</span> <span class="n">__block_descriptor_10</span> <span class="o">=</span> <span class="p">{</span> <span class="mi">0</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="k">struct</span> <span class="n">__block_literal_10</span><span class="p">),</span> <span class="n">__block_copy_10</span><span class="p">,</span> <span class="n">__block_dispose_10</span> <span class="p">};</span>
+</pre></div>
+</div>
+<p>and the code would be:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="p">{</span>
+ <span class="n">FOO</span> <span class="n">foo</span><span class="p">;</span>
+ <span class="n">comp_ctor</span><span class="p">(</span><span class="o">&</span><span class="n">foo</span><span class="p">);</span> <span class="c1">// default constructor</span>
+ <span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="n">_block_literal</span> <span class="o">=</span> <span class="p">{</span>
+ <span class="o">&</span><span class="n">_NSConcreteStackBlock</span><span class="p">,</span>
+ <span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">25</span><span class="p">)</span><span class="o">|</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">26</span><span class="p">)</span><span class="o">|</span><span class="p">(</span><span class="mi">1</span><span class="o"><<</span><span class="mi">29</span><span class="p">),</span> <span class="o"><</span><span class="n">uninitialized</span><span class="o">></span><span class="p">,</span>
+ <span class="n">__block_invoke_10</span><span class="p">,</span>
+ <span class="o">&</span><span class="n">__block_descriptor_10</span><span class="p">,</span>
+ <span class="p">};</span>
+ <span class="n">comp_ctor</span><span class="p">(</span><span class="o">&</span><span class="n">_block_literal</span><span class="o">-></span><span class="n">foo</span><span class="p">,</span> <span class="o">&</span><span class="n">foo</span><span class="p">);</span> <span class="c1">// const copy into stack version</span>
+ <span class="k">struct</span> <span class="n">__block_literal_10</span> <span class="o">&</span><span class="n">block</span> <span class="o">=</span> <span class="o">&</span><span class="n">_block_literal</span><span class="p">;</span> <span class="c1">// assign literal to block variable</span>
+ <span class="n">block</span><span class="o">-></span><span class="n">invoke</span><span class="p">(</span><span class="n">block</span><span class="p">);</span> <span class="c1">// invoke block</span>
+ <span class="n">comp_dtor</span><span class="p">(</span><span class="o">&</span><span class="n">_block_literal</span><span class="o">-></span><span class="n">foo</span><span class="p">);</span> <span class="c1">// destroy stack version of const block copy</span>
+ <span class="n">comp_dtor</span><span class="p">(</span><span class="o">&</span><span class="n">foo</span><span class="p">);</span> <span class="c1">// destroy original version</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>C++ objects stored in <tt class="docutils literal"><span class="pre">__block</span></tt> storage start out on the stack in a
+<tt class="docutils literal"><span class="pre">block_byref</span></tt> data structure as do other variables. Such objects (if not
+<tt class="docutils literal"><span class="pre">const</span></tt> objects) must support a regular copy constructor. The <tt class="docutils literal"><span class="pre">block_byref</span></tt>
+data structure will have copy and destroy helper routines synthesized by the
+compiler. The copy helper will have code created to perform the copy
+constructor based on the initial stack <tt class="docutils literal"><span class="pre">block_byref</span></tt> data structure, and will
+also set the (1<<26) bit in addition to the (1<<25) bit. The destroy helper
+will have code to do the destructor on the object stored within the supplied
+<tt class="docutils literal"><span class="pre">block_byref</span></tt> heap data structure. For example,</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="n">__block</span> <span class="n">FOO</span> <span class="n">blockStorageFoo</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>requires the normal constructor for the embedded <tt class="docutils literal"><span class="pre">blockStorageFoo</span></tt> object:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="n">FOO_ctor</span><span class="p">(</span><span class="o">&</span> <span class="n">_block_byref_blockStorageFoo</span><span class="o">-></span><span class="n">blockStorageFoo</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>and at scope termination the destructor:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="n">FOO_dtor</span><span class="p">(</span><span class="o">&</span> <span class="n">_block_byref_blockStorageFoo</span><span class="o">-></span><span class="n">blockStorageFoo</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Note that the forwarding indirection is <em>NOT</em> used.</p>
+<p>The compiler would need to generate (if used from a block literal) the following
+copy/dispose helpers:</p>
+<div class="highlight-c++"><div class="highlight"><pre><span class="kt">void</span> <span class="nf">_block_byref_obj_keep</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_blockStorageFoo</span> <span class="o">*</span><span class="n">dst</span><span class="p">,</span> <span class="k">struct</span> <span class="n">_block_byref_blockStorageFoo</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">FOO_ctor</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">blockStorageFoo</span><span class="p">,</span> <span class="o">&</span><span class="n">src</span><span class="o">-></span><span class="n">blockStorageFoo</span><span class="p">);</span>
+<span class="p">}</span>
+
+<span class="kt">void</span> <span class="nf">_block_byref_obj_dispose</span><span class="p">(</span><span class="k">struct</span> <span class="n">_block_byref_blockStorageFoo</span> <span class="o">*</span><span class="n">src</span><span class="p">)</span> <span class="p">{</span>
+ <span class="n">FOO_dtor</span><span class="p">(</span><span class="o">&</span><span class="n">src</span><span class="o">-></span><span class="n">blockStorageFoo</span><span class="p">);</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>for the appropriately named constructor and destructor for the class/struct
+<tt class="docutils literal"><span class="pre">FOO</span></tt>.</p>
+<p>To support member variable and function access the compiler will synthesize a
+<tt class="docutils literal"><span class="pre">const</span></tt> pointer to a block version of the <tt class="docutils literal"><span class="pre">this</span></tt> pointer.</p>
+</div>
+<div class="section" id="runtime-helper-functions">
+<span id="runtimehelperfunctions"></span><h2><a class="toc-backref" href="#id19">Runtime Helper Functions</a><a class="headerlink" href="#runtime-helper-functions" title="Permalink to this headline">¶</a></h2>
+<p>The runtime helper functions are described in
+<tt class="docutils literal"><span class="pre">/usr/local/include/Block_private.h</span></tt>. To summarize their use, a <tt class="docutils literal"><span class="pre">Block</span></tt>
+requires copy/dispose helpers if it imports any block variables, <tt class="docutils literal"><span class="pre">__block</span></tt>
+storage variables, <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> variables, or C++ <tt class="docutils literal"><span class="pre">const</span></tt>
+copied objects with constructor/destructors. The (1<<26) bit is set and
+functions are generated.</p>
+<p>The block copy helper function should, for each of the variables of the type
+mentioned above, call:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">_Block_object_assign</span><span class="p">(</span><span class="o">&</span><span class="n">dst</span><span class="o">-></span><span class="n">target</span><span class="p">,</span> <span class="n">src</span><span class="o">-></span><span class="n">target</span><span class="p">,</span> <span class="n">BLOCK_FIELD_</span><span class="o"><</span><span class="n">appropo</span><span class="o">></span><span class="p">);</span>
+</pre></div>
+</div>
+<p>in the copy helper and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">_Block_object_dispose</span><span class="p">(</span><span class="o">-></span><span class="n">target</span><span class="p">,</span> <span class="n">BLOCK_FIELD_</span><span class="o"><</span><span class="n">appropo</span><span class="o">></span><span class="p">);</span>
+</pre></div>
+</div>
+<p>in the dispose helper where <tt class="docutils literal"><span class="pre"><appropo></span></tt> is:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">enum</span> <span class="p">{</span>
+ <span class="n">BLOCK_FIELD_IS_OBJECT</span> <span class="o">=</span> <span class="mi">3</span><span class="p">,</span> <span class="c1">// id, NSObject, __attribute__((NSObject)), block, ...</span>
+ <span class="n">BLOCK_FIELD_IS_BLOCK</span> <span class="o">=</span> <span class="mi">7</span><span class="p">,</span> <span class="c1">// a block variable</span>
+ <span class="n">BLOCK_FIELD_IS_BYREF</span> <span class="o">=</span> <span class="mi">8</span><span class="p">,</span> <span class="c1">// the on stack structure holding the __block variable</span>
+
+ <span class="n">BLOCK_FIELD_IS_WEAK</span> <span class="o">=</span> <span class="mi">16</span><span class="p">,</span> <span class="c1">// declared __weak</span>
+
+ <span class="n">BLOCK_BYREF_CALLER</span> <span class="o">=</span> <span class="mi">128</span><span class="p">,</span> <span class="c1">// called from byref copy/dispose helpers</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+<p>and of course the constructors/destructors for <tt class="docutils literal"><span class="pre">const</span></tt> copied C++ objects.</p>
+<p>The <tt class="docutils literal"><span class="pre">block_byref</span></tt> data structure similarly requires copy/dispose helpers for
+block variables, <tt class="docutils literal"><span class="pre">__attribute__((NSObject))</span></tt> variables, or C++ <tt class="docutils literal"><span class="pre">const</span></tt>
+copied objects with constructor/destructors, and again the (1<<26) bit is set
+and functions are generated in the same manner.</p>
+<p>Under ObjC we allow <tt class="docutils literal"><span class="pre">__weak</span></tt> as an attribute on <tt class="docutils literal"><span class="pre">__block</span></tt> variables, and
+this causes the addition of <tt class="docutils literal"><span class="pre">BLOCK_FIELD_IS_WEAK</span></tt> orred onto the
+<tt class="docutils literal"><span class="pre">BLOCK_FIELD_IS_BYREF</span></tt> flag when copying the <tt class="docutils literal"><span class="pre">block_byref</span></tt> structure in the
+<tt class="docutils literal"><span class="pre">Block</span></tt> copy helper, and onto the <tt class="docutils literal"><span class="pre">BLOCK_FIELD_<appropo></span></tt> field within the
+<tt class="docutils literal"><span class="pre">block_byref</span></tt> copy/dispose helper calls.</p>
+<p>The prototypes, and summary, of the helper functions are:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="cm">/* Certain field types require runtime assistance when being copied to the</span>
+<span class="cm"> heap. The following function is used to copy fields of types: blocks,</span>
+<span class="cm"> pointers to byref structures, and objects (including</span>
+<span class="cm"> __attribute__((NSObject)) pointers. BLOCK_FIELD_IS_WEAK is orthogonal to</span>
+<span class="cm"> the other choices which are mutually exclusive. Only in a Block copy</span>
+<span class="cm"> helper will one see BLOCK_FIELD_IS_BYREF.</span>
+<span class="cm">*/</span>
+<span class="kt">void</span> <span class="nf">_Block_object_assign</span><span class="p">(</span><span class="kt">void</span> <span class="o">*</span><span class="n">destAddr</span><span class="p">,</span> <span class="k">const</span> <span class="kt">void</span> <span class="o">*</span><span class="n">object</span><span class="p">,</span> <span class="k">const</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">);</span>
+
+<span class="cm">/* Similarly a compiler generated dispose helper needs to call back for each</span>
+<span class="cm"> field of the byref data structure. (Currently the implementation only</span>
+<span class="cm"> packs one field into the byref structure but in principle there could be</span>
+<span class="cm"> more). The same flags used in the copy helper should be used for each</span>
+<span class="cm"> call generated to this function:</span>
+<span class="cm">*/</span>
+<span class="kt">void</span> <span class="nf">_Block_object_dispose</span><span class="p">(</span><span class="k">const</span> <span class="kt">void</span> <span class="o">*</span><span class="n">object</span><span class="p">,</span> <span class="k">const</span> <span class="kt">int</span> <span class="n">flags</span><span class="p">);</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="copyright">
+<h2><a class="toc-backref" href="#id20">Copyright</a><a class="headerlink" href="#copyright" title="Permalink to this headline">¶</a></h2>
+<p>Copyright 2008-2010 Apple, Inc.
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the “Software”), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:</p>
+<p>The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.</p>
+<p>THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.</p>
+</div>
+</div>
+
+
+ </div>
+ <div class="bottomnav">
+
+ <p>
+ « <a href="BlockLanguageSpec.html">Language Specification for Blocks</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="AutomaticReferenceCounting.html">Objective-C Automatic Reference Counting (ARC)</a> »
+ </p>
+
+ </div>
+
+ <div class="footer">
+ © Copyright 2007-2016, The Clang Team.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
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+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>Clang 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>Language Specification for Blocks</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ « <a href="ObjectiveCLiterals.html">Objective-C Literals</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="Block-ABI-Apple.html">Block Implementation Specification</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <div class="section" id="language-specification-for-blocks">
+<h1>Language Specification for Blocks<a class="headerlink" href="#language-specification-for-blocks" title="Permalink to this headline">¶</a></h1>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#revisions" id="id1">Revisions</a></li>
+<li><a class="reference internal" href="#overview" id="id2">Overview</a></li>
+<li><a class="reference internal" href="#the-block-type" id="id3">The Block Type</a></li>
+<li><a class="reference internal" href="#block-variable-declarations" id="id4">Block Variable Declarations</a></li>
+<li><a class="reference internal" href="#block-literal-expressions" id="id5">Block Literal Expressions</a></li>
+<li><a class="reference internal" href="#the-invoke-operator" id="id6">The Invoke Operator</a></li>
+<li><a class="reference internal" href="#the-copy-and-release-operations" id="id7">The Copy and Release Operations</a></li>
+<li><a class="reference internal" href="#the-block-storage-qualifier" id="id8">The <tt class="docutils literal"><span class="pre">__block</span></tt> Storage Qualifier</a></li>
+<li><a class="reference internal" href="#control-flow" id="id9">Control Flow</a></li>
+<li><a class="reference internal" href="#objective-c-extensions" id="id10">Objective-C Extensions</a></li>
+<li><a class="reference internal" href="#c-extensions" id="id11">C++ Extensions</a></li>
+</ul>
+</div>
+<div class="section" id="revisions">
+<h2><a class="toc-backref" href="#id1">Revisions</a><a class="headerlink" href="#revisions" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li>2008/2/25 — created</li>
+<li>2008/7/28 — revised, <tt class="docutils literal"><span class="pre">__block</span></tt> syntax</li>
+<li>2008/8/13 — revised, Block globals</li>
+<li>2008/8/21 — revised, C++ elaboration</li>
+<li>2008/11/1 — revised, <tt class="docutils literal"><span class="pre">__weak</span></tt> support</li>
+<li>2009/1/12 — revised, explicit return types</li>
+<li>2009/2/10 — revised, <tt class="docutils literal"><span class="pre">__block</span></tt> objects need retain</li>
+</ul>
+</div>
+<div class="section" id="overview">
+<h2><a class="toc-backref" href="#id2">Overview</a><a class="headerlink" href="#overview" title="Permalink to this headline">¶</a></h2>
+<p>A new derived type is introduced to C and, by extension, Objective-C,
+C++, and Objective-C++</p>
+</div>
+<div class="section" id="the-block-type">
+<h2><a class="toc-backref" href="#id3">The Block Type</a><a class="headerlink" href="#the-block-type" title="Permalink to this headline">¶</a></h2>
+<p>Like function types, the <span class="block-term">Block type</span> is a pair consisting
+of a result value type and a list of parameter types very similar to a
+function type. Blocks are intended to be used much like functions with
+the key distinction being that in addition to executable code they
+also contain various variable bindings to automatic (stack) or managed
+(heap) memory.</p>
+<p>The abstract declarator,</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="p">(</span><span class="o">^</span><span class="p">)(</span><span class="kt">char</span><span class="p">,</span> <span class="kt">float</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>describes a reference to a Block that, when invoked, takes two
+parameters, the first of type char and the second of type float, and
+returns a value of type int. The Block referenced is of opaque data
+that may reside in automatic (stack) memory, global memory, or heap
+memory.</p>
+</div>
+<div class="section" id="block-variable-declarations">
+<h2><a class="toc-backref" href="#id4">Block Variable Declarations</a><a class="headerlink" href="#block-variable-declarations" title="Permalink to this headline">¶</a></h2>
+<p>A <span class="block-term">variable with Block type</span> is declared using function
+pointer style notation substituting <tt class="docutils literal"><span class="pre">^</span></tt> for <tt class="docutils literal"><span class="pre">*</span></tt>. The following are
+valid Block variable declarations:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">blockReturningVoidWithVoidArgument</span><span class="p">)(</span><span class="kt">void</span><span class="p">);</span>
+<span class="kt">int</span> <span class="p">(</span><span class="o">^</span><span class="n">blockReturningIntWithIntAndCharArguments</span><span class="p">)(</span><span class="kt">int</span><span class="p">,</span> <span class="kt">char</span><span class="p">);</span>
+<span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">arrayOfTenBlocksReturningVoidWithIntArgument</span><span class="p">[</span><span class="mi">10</span><span class="p">])(</span><span class="kt">int</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Variadic <tt class="docutils literal"><span class="pre">...</span></tt> arguments are supported. [variadic.c] A Block that
+takes no arguments must specify void in the argument list [voidarg.c].
+An empty parameter list does not represent, as K&R provide, an
+unspecified argument list. Note: both gcc and clang support K&R style
+as a convenience.</p>
+<p>A Block reference may be cast to a pointer of arbitrary type and vice
+versa. [cast.c] A Block reference may not be dereferenced via the
+pointer dereference operator <tt class="docutils literal"><span class="pre">*</span></tt>, and thus a Block’s size may not be
+computed at compile time. [sizeof.c]</p>
+</div>
+<div class="section" id="block-literal-expressions">
+<h2><a class="toc-backref" href="#id5">Block Literal Expressions</a><a class="headerlink" href="#block-literal-expressions" title="Permalink to this headline">¶</a></h2>
+<p>A <span class="block-term">Block literal expression</span> produces a reference to a
+Block. It is introduced by the use of the <tt class="docutils literal"><span class="pre">^</span></tt> token as a unary
+operator.</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">Block_literal_expression</span> <span class="o">::=</span> <span class="o">^</span> <span class="n">block_decl</span> <span class="n">compound_statement_body</span>
+<span class="n">block_decl</span> <span class="o">::=</span>
+<span class="n">block_decl</span> <span class="o">::=</span> <span class="n">parameter_list</span>
+<span class="n">block_decl</span> <span class="o">::=</span> <span class="n">type_expression</span>
+</pre></div>
+</div>
+<p>where type expression is extended to allow <tt class="docutils literal"><span class="pre">^</span></tt> as a Block reference
+(pointer) where <tt class="docutils literal"><span class="pre">*</span></tt> is allowed as a function reference (pointer).</p>
+<p>The following Block literal:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="o">^</span> <span class="kt">void</span> <span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="p">{</span> <span class="n">printf</span><span class="p">(</span><span class="s">"hello world</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>produces a reference to a Block with no arguments with no return value.</p>
+<p>The return type is optional and is inferred from the return
+statements. If the return statements return a value, they all must
+return a value of the same type. If there is no value returned the
+inferred type of the Block is void; otherwise it is the type of the
+return statement value.</p>
+<p>If the return type is omitted and the argument list is <tt class="docutils literal"><span class="pre">(</span> <span class="pre">void</span> <span class="pre">)</span></tt>,
+the <tt class="docutils literal"><span class="pre">(</span> <span class="pre">void</span> <span class="pre">)</span></tt> argument list may also be omitted.</p>
+<p>So:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="o">^</span> <span class="p">(</span> <span class="kt">void</span> <span class="p">)</span> <span class="p">{</span> <span class="n">printf</span><span class="p">(</span><span class="s">"hello world</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="o">^</span> <span class="p">{</span> <span class="n">printf</span><span class="p">(</span><span class="s">"hello world</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>are exactly equivalent constructs for the same expression.</p>
+<p>The type_expression extends C expression parsing to accommodate Block
+reference declarations as it accommodates function pointer
+declarations.</p>
+<p>Given:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">typedef</span> <span class="nf">int</span> <span class="p">(</span><span class="o">*</span><span class="n">pointerToFunctionThatReturnsIntWithCharArg</span><span class="p">)(</span><span class="kt">char</span><span class="p">);</span>
+<span class="n">pointerToFunctionThatReturnsIntWithCharArg</span> <span class="n">functionPointer</span><span class="p">;</span>
+<span class="o">^</span> <span class="n">pointerToFunctionThatReturnsIntWithCharArg</span> <span class="p">(</span><span class="kt">float</span> <span class="n">x</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">functionPointer</span><span class="p">;</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>and:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="o">^</span> <span class="kt">int</span> <span class="p">((</span><span class="o">*</span><span class="p">)(</span><span class="kt">float</span> <span class="n">x</span><span class="p">))(</span><span class="kt">char</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">functionPointer</span><span class="p">;</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>are equivalent expressions, as is:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="o">^</span><span class="p">(</span><span class="kt">float</span> <span class="n">x</span><span class="p">)</span> <span class="p">{</span> <span class="k">return</span> <span class="n">functionPointer</span><span class="p">;</span> <span class="p">}</span>
+</pre></div>
+</div>
+<p>[returnfunctionptr.c]</p>
+<p>The compound statement body establishes a new lexical scope within
+that of its parent. Variables used within the scope of the compound
+statement are bound to the Block in the normal manner with the
+exception of those in automatic (stack) storage. Thus one may access
+functions and global variables as one would expect, as well as static
+local variables. [testme]</p>
+<p>Local automatic (stack) variables referenced within the compound
+statement of a Block are imported and captured by the Block as const
+copies. The capture (binding) is performed at the time of the Block
+literal expression evaluation.</p>
+<p>The compiler is not required to capture a variable if it can prove
+that no references to the variable will actually be evaluated.
+Programmers can force a variable to be captured by referencing it in a
+statement at the beginning of the Block, like so:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="p">(</span><span class="kt">void</span><span class="p">)</span> <span class="n">foo</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>This matters when capturing the variable has side-effects, as it can
+in Objective-C or C++.</p>
+<p>The lifetime of variables declared in a Block is that of a function;
+each activation frame contains a new copy of variables declared within
+the local scope of the Block. Such variable declarations should be
+allowed anywhere [testme] rather than only when C99 parsing is
+requested, including for statements. [testme]</p>
+<p>Block literal expressions may occur within Block literal expressions
+(nest) and all variables captured by any nested blocks are implicitly
+also captured in the scopes of their enclosing Blocks.</p>
+<p>A Block literal expression may be used as the initialization value for
+Block variables at global or local static scope.</p>
+</div>
+<div class="section" id="the-invoke-operator">
+<h2><a class="toc-backref" href="#id6">The Invoke Operator</a><a class="headerlink" href="#the-invoke-operator" title="Permalink to this headline">¶</a></h2>
+<p>Blocks are <span class="block-term">invoked</span> using function call syntax with a
+list of expression parameters of types corresponding to the
+declaration and returning a result type also according to the
+declaration. Given:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="kt">int</span> <span class="p">(</span><span class="o">^</span><span class="n">x</span><span class="p">)(</span><span class="kt">char</span><span class="p">);</span>
+<span class="kt">void</span> <span class="p">(</span><span class="o">^</span><span class="n">z</span><span class="p">)(</span><span class="kt">void</span><span class="p">);</span>
+<span class="kt">int</span> <span class="p">(</span><span class="o">^</span><span class="p">(</span><span class="o">*</span><span class="n">y</span><span class="p">))(</span><span class="kt">char</span><span class="p">)</span> <span class="o">=</span> <span class="o">&</span><span class="n">x</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>the following are all legal Block invocations:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">x</span><span class="p">(</span><span class="sc">'a'</span><span class="p">);</span>
+<span class="p">(</span><span class="o">*</span><span class="n">y</span><span class="p">)(</span><span class="sc">'a'</span><span class="p">);</span>
+<span class="p">(</span><span class="nb">true</span> <span class="o">?</span> <span class="n">x</span> <span class="o">:</span> <span class="o">*</span><span class="n">y</span><span class="p">)(</span><span class="sc">'a'</span><span class="p">)</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="the-copy-and-release-operations">
+<h2><a class="toc-backref" href="#id7">The Copy and Release Operations</a><a class="headerlink" href="#the-copy-and-release-operations" title="Permalink to this headline">¶</a></h2>
+<p>The compiler and runtime provide <span class="block-term">copy</span> and
+<span class="block-term">release</span> operations for Block references that create and,
+in matched use, release allocated storage for referenced Blocks.</p>
+<p>The copy operation <tt class="docutils literal"><span class="pre">Block_copy()</span></tt> is styled as a function that takes
+an arbitrary Block reference and returns a Block reference of the same
+type. The release operation, <tt class="docutils literal"><span class="pre">Block_release()</span></tt>, is styled as a
+function that takes an arbitrary Block reference and, if dynamically
+matched to a Block copy operation, allows recovery of the referenced
+allocated memory.</p>
+</div>
+<div class="section" id="the-block-storage-qualifier">
+<h2><a class="toc-backref" href="#id8">The <tt class="docutils literal"><span class="pre">__block</span></tt> Storage Qualifier</a><a class="headerlink" href="#the-block-storage-qualifier" title="Permalink to this headline">¶</a></h2>
+<p>In addition to the new Block type we also introduce a new storage
+qualifier, <span class="block-term">__block</span>, for local variables. [testme: a
+__block declaration within a block literal] The <tt class="docutils literal"><span class="pre">__block</span></tt> storage
+qualifier is mutually exclusive to the existing local storage
+qualifiers auto, register, and static. [testme] Variables qualified by
+<tt class="docutils literal"><span class="pre">__block</span></tt> act as if they were in allocated storage and this storage
+is automatically recovered after last use of said variable. An
+implementation may choose an optimization where the storage is
+initially automatic and only “moved” to allocated (heap) storage upon
+a Block_copy of a referencing Block. Such variables may be mutated as
+normal variables are.</p>
+<p>In the case where a <tt class="docutils literal"><span class="pre">__block</span></tt> variable is a Block one must assume
+that the <tt class="docutils literal"><span class="pre">__block</span></tt> variable resides in allocated storage and as such
+is assumed to reference a Block that is also in allocated storage
+(that it is the result of a <tt class="docutils literal"><span class="pre">Block_copy</span></tt> operation). Despite this
+there is no provision to do a <tt class="docutils literal"><span class="pre">Block_copy</span></tt> or a <tt class="docutils literal"><span class="pre">Block_release</span></tt> if
+an implementation provides initial automatic storage for Blocks. This
+is due to the inherent race condition of potentially several threads
+trying to update the shared variable and the need for synchronization
+around disposing of older values and copying new ones. Such
+synchronization is beyond the scope of this language specification.</p>
+</div>
+<div class="section" id="control-flow">
+<h2><a class="toc-backref" href="#id9">Control Flow</a><a class="headerlink" href="#control-flow" title="Permalink to this headline">¶</a></h2>
+<p>The compound statement of a Block is treated much like a function body
+with respect to control flow in that goto, break, and continue do not
+escape the Block. Exceptions are treated <em>normally</em> in that when
+thrown they pop stack frames until a catch clause is found.</p>
+</div>
+<div class="section" id="objective-c-extensions">
+<h2><a class="toc-backref" href="#id10">Objective-C Extensions</a><a class="headerlink" href="#objective-c-extensions" title="Permalink to this headline">¶</a></h2>
+<p>Objective-C extends the definition of a Block reference type to be
+that also of id. A variable or expression of Block type may be
+messaged or used as a parameter wherever an id may be. The converse is
+also true. Block references may thus appear as properties and are
+subject to the assign, retain, and copy attribute logic that is
+reserved for objects.</p>
+<p>All Blocks are constructed to be Objective-C objects regardless of
+whether the Objective-C runtime is operational in the program or
+not. Blocks using automatic (stack) memory are objects and may be
+messaged, although they may not be assigned into <tt class="docutils literal"><span class="pre">__weak</span></tt> locations
+if garbage collection is enabled.</p>
+<p>Within a Block literal expression within a method definition
+references to instance variables are also imported into the lexical
+scope of the compound statement. These variables are implicitly
+qualified as references from self, and so self is imported as a const
+copy. The net effect is that instance variables can be mutated.</p>
+<p>The <span class="block-term">Block_copy</span> operator retains all objects held in
+variables of automatic storage referenced within the Block expression
+(or form strong references if running under garbage collection).
+Object variables of <tt class="docutils literal"><span class="pre">__block</span></tt> storage type are assumed to hold
+normal pointers with no provision for retain and release messages.</p>
+<p>Foundation defines (and supplies) <tt class="docutils literal"><span class="pre">-copy</span></tt> and <tt class="docutils literal"><span class="pre">-release</span></tt> methods for
+Blocks.</p>
+<p>In the Objective-C and Objective-C++ languages, we allow the
+<tt class="docutils literal"><span class="pre">__weak</span></tt> specifier for <tt class="docutils literal"><span class="pre">__block</span></tt> variables of object type. If
+garbage collection is not enabled, this qualifier causes these
+variables to be kept without retain messages being sent. This
+knowingly leads to dangling pointers if the Block (or a copy) outlives
+the lifetime of this object.</p>
+<p>In garbage collected environments, the <tt class="docutils literal"><span class="pre">__weak</span></tt> variable is set to
+nil when the object it references is collected, as long as the
+<tt class="docutils literal"><span class="pre">__block</span></tt> variable resides in the heap (either by default or via
+<tt class="docutils literal"><span class="pre">Block_copy()</span></tt>). The initial Apple implementation does in fact
+start <tt class="docutils literal"><span class="pre">__block</span></tt> variables on the stack and migrate them to the heap
+only as a result of a <tt class="docutils literal"><span class="pre">Block_copy()</span></tt> operation.</p>
+<p>It is a runtime error to attempt to assign a reference to a
+stack-based Block into any storage marked <tt class="docutils literal"><span class="pre">__weak</span></tt>, including
+<tt class="docutils literal"><span class="pre">__weak</span></tt> <tt class="docutils literal"><span class="pre">__block</span></tt> variables.</p>
+</div>
+<div class="section" id="c-extensions">
+<h2><a class="toc-backref" href="#id11">C++ Extensions</a><a class="headerlink" href="#c-extensions" title="Permalink to this headline">¶</a></h2>
+<p>Block literal expressions within functions are extended to allow const
+use of C++ objects, pointers, or references held in automatic storage.</p>
+<p>As usual, within the block, references to captured variables become
+const-qualified, as if they were references to members of a const
+object. Note that this does not change the type of a variable of
+reference type.</p>
+<p>For example, given a class Foo:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="n">Foo</span> <span class="n">foo</span><span class="p">;</span>
+<span class="n">Foo</span> <span class="o">&</span><span class="n">fooRef</span> <span class="o">=</span> <span class="n">foo</span><span class="p">;</span>
+<span class="n">Foo</span> <span class="o">*</span><span class="n">fooPtr</span> <span class="o">=</span> <span class="o">&</span><span class="n">foo</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>A Block that referenced these variables would import the variables as
+const variations:</p>
+<div class="highlight-c"><div class="highlight"><pre><span class="k">const</span> <span class="n">Foo</span> <span class="n">block_foo</span> <span class="o">=</span> <span class="n">foo</span><span class="p">;</span>
+<span class="n">Foo</span> <span class="o">&</span><span class="n">block_fooRef</span> <span class="o">=</span> <span class="n">fooRef</span><span class="p">;</span>
+<span class="n">Foo</span> <span class="o">*</span><span class="k">const</span> <span class="n">block_fooPtr</span> <span class="o">=</span> <span class="n">fooPtr</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>Captured variables are copied into the Block at the instant of
+evaluating the Block literal expression. They are also copied when
+calling <tt class="docutils literal"><span class="pre">Block_copy()</span></tt> on a Block allocated on the stack. In both
+cases, they are copied as if the variable were const-qualified, and
+it’s an error if there’s no such constructor.</p>
+<p>Captured variables in Blocks on the stack are destroyed when control
+leaves the compound statement that contains the Block literal
+expression. Captured variables in Blocks on the heap are destroyed
+when the reference count of the Block drops to zero.</p>
+<p>Variables declared as residing in <tt class="docutils literal"><span class="pre">__block</span></tt> storage may be initially
+allocated in the heap or may first appear on the stack and be copied
+to the heap as a result of a <tt class="docutils literal"><span class="pre">Block_copy()</span></tt> operation. When copied
+from the stack, <tt class="docutils literal"><span class="pre">__block</span></tt> variables are copied using their normal
+qualification (i.e. without adding const). In C++11, <tt class="docutils literal"><span class="pre">__block</span></tt>
+variables are copied as x-values if that is possible, then as l-values
+if not; if both fail, it’s an error. The destructor for any initial
+stack-based version is called at the variable’s normal end of scope.</p>
+<p>References to <tt class="docutils literal"><span class="pre">this</span></tt>, as well as references to non-static members of
+any enclosing class, are evaluated by capturing <tt class="docutils literal"><span class="pre">this</span></tt> just like a
+normal variable of C pointer type.</p>
+<p>Member variables that are Blocks may not be overloaded by the types of
+their arguments.</p>
+</div>
+</div>
+
+
+ </div>
+ <div class="bottomnav">
+
+ <p>
+ « <a href="ObjectiveCLiterals.html">Objective-C Literals</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="Block-ABI-Apple.html">Block Implementation Specification</a> »
+ </p>
+
+ </div>
+
+ <div class="footer">
+ © Copyright 2007-2016, The Clang Team.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
+ </div>
+ </body>
+</html>
\ No newline at end of file
Added: www-releases/trunk/3.8.0/tools/clang/docs/ClangCheck.html
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/tools/clang/docs/ClangCheck.html?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/tools/clang/docs/ClangCheck.html (added)
+++ www-releases/trunk/3.8.0/tools/clang/docs/ClangCheck.html Tue Mar 8 12:28:17 2016
@@ -0,0 +1,103 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+ <title>ClangCheck — Clang 3.8 documentation</title>
+
+ <link rel="stylesheet" href="_static/haiku.css" type="text/css" />
+ <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
+
+ <script type="text/javascript">
+ var DOCUMENTATION_OPTIONS = {
+ URL_ROOT: './',
+ VERSION: '3.8',
+ COLLAPSE_INDEX: false,
+ FILE_SUFFIX: '.html',
+ HAS_SOURCE: true
+ };
+ </script>
+ <script type="text/javascript" src="_static/jquery.js"></script>
+ <script type="text/javascript" src="_static/underscore.js"></script>
+ <script type="text/javascript" src="_static/doctools.js"></script>
+ <script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+ <link rel="top" title="Clang 3.8 documentation" href="index.html" />
+ <link rel="next" title="ClangFormat" href="ClangFormat.html" />
+ <link rel="prev" title="Overview" href="ClangTools.html" />
+ </head>
+ <body>
+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>Clang 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>ClangCheck</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ « <a href="ClangTools.html">Overview</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="ClangFormat.html">ClangFormat</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <div class="section" id="clangcheck">
+<h1>ClangCheck<a class="headerlink" href="#clangcheck" title="Permalink to this headline">¶</a></h1>
+<p><cite>ClangCheck</cite> is a small wrapper around <a class="reference internal" href="LibTooling.html"><em>LibTooling</em></a> which can be used to
+do basic error checking and AST dumping.</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="gp">$</span> cat <span class="s"><<EOF > snippet.cc</span>
+<span class="gp">></span><span class="s"> void f() {</span>
+<span class="gp">></span><span class="s"> int a = 0</span>
+<span class="gp">></span><span class="s"> }</span>
+<span class="gp">></span><span class="s"> EOF</span>
+<span class="gp">$</span> ~/clang/build/bin/clang-check snippet.cc -ast-dump --
+<span class="go">Processing: /Users/danieljasper/clang/llvm/tools/clang/docs/snippet.cc.</span>
+<span class="go">/Users/danieljasper/clang/llvm/tools/clang/docs/snippet.cc:2:12: error: expected ';' at end of</span>
+<span class="go"> declaration</span>
+<span class="go"> int a = 0</span>
+<span class="go"> ^</span>
+<span class="go"> ;</span>
+<span class="go">(TranslationUnitDecl 0x7ff3a3029ed0 <<invalid sloc>></span>
+<span class="go"> (TypedefDecl 0x7ff3a302a410 <<invalid sloc>> __int128_t '__int128')</span>
+<span class="go"> (TypedefDecl 0x7ff3a302a470 <<invalid sloc>> __uint128_t 'unsigned __int128')</span>
+<span class="go"> (TypedefDecl 0x7ff3a302a830 <<invalid sloc>> __builtin_va_list '__va_list_tag [1]')</span>
+<span class="go"> (FunctionDecl 0x7ff3a302a8d0 </Users/danieljasper/clang/llvm/tools/clang/docs/snippet.cc:1:1, line:3:1> f 'void (void)'</span>
+<span class="go"> (CompoundStmt 0x7ff3a302aa10 <line:1:10, line:3:1></span>
+<span class="go"> (DeclStmt 0x7ff3a302a9f8 <line:2:3, line:3:1></span>
+<span class="go"> (VarDecl 0x7ff3a302a980 <line:2:3, col:11> a 'int'</span>
+<span class="go"> (IntegerLiteral 0x7ff3a302a9d8 <col:11> 'int' 0))))))</span>
+<span class="go">1 error generated.</span>
+<span class="go">Error while processing snippet.cc.</span>
+</pre></div>
+</div>
+<p>The ‘–’ at the end is important as it prevents <cite>clang-check</cite> from search for a
+compilation database. For more information on how to setup and use <cite>clang-check</cite>
+in a project, see <a class="reference internal" href="HowToSetupToolingForLLVM.html"><em>How To Setup Clang Tooling For LLVM</em></a>.</p>
+</div>
+
+
+ </div>
+ <div class="bottomnav">
+
+ <p>
+ « <a href="ClangTools.html">Overview</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="ClangFormat.html">ClangFormat</a> »
+ </p>
+
+ </div>
+
+ <div class="footer">
+ © Copyright 2007-2016, The Clang Team.
+ Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.2.2.
+ </div>
+ </body>
+</html>
\ No newline at end of file
Added: www-releases/trunk/3.8.0/tools/clang/docs/ClangFormat.html
URL: http://llvm.org/viewvc/llvm-project/www-releases/trunk/3.8.0/tools/clang/docs/ClangFormat.html?rev=262945&view=auto
==============================================================================
--- www-releases/trunk/3.8.0/tools/clang/docs/ClangFormat.html (added)
+++ www-releases/trunk/3.8.0/tools/clang/docs/ClangFormat.html Tue Mar 8 12:28:17 2016
@@ -0,0 +1,232 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+ "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+
+
+<html xmlns="http://www.w3.org/1999/xhtml">
+ <head>
+ <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+
+ <title>ClangFormat — Clang 3.8 documentation</title>
+
+ <link rel="stylesheet" href="_static/haiku.css" type="text/css" />
+ <link rel="stylesheet" href="_static/pygments.css" type="text/css" />
+
+ <script type="text/javascript">
+ var DOCUMENTATION_OPTIONS = {
+ URL_ROOT: './',
+ VERSION: '3.8',
+ COLLAPSE_INDEX: false,
+ FILE_SUFFIX: '.html',
+ HAS_SOURCE: true
+ };
+ </script>
+ <script type="text/javascript" src="_static/jquery.js"></script>
+ <script type="text/javascript" src="_static/underscore.js"></script>
+ <script type="text/javascript" src="_static/doctools.js"></script>
+ <script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
+ <link rel="top" title="Clang 3.8 documentation" href="index.html" />
+ <link rel="next" title="Clang-Format Style Options" href="ClangFormatStyleOptions.html" />
+ <link rel="prev" title="ClangCheck" href="ClangCheck.html" />
+ </head>
+ <body>
+ <div class="header"><h1 class="heading"><a href="index.html">
+ <span>Clang 3.8 documentation</span></a></h1>
+ <h2 class="heading"><span>ClangFormat</span></h2>
+ </div>
+ <div class="topnav">
+
+ <p>
+ « <a href="ClangCheck.html">ClangCheck</a>
+ ::
+ <a class="uplink" href="index.html">Contents</a>
+ ::
+ <a href="ClangFormatStyleOptions.html">Clang-Format Style Options</a> »
+ </p>
+
+ </div>
+ <div class="content">
+
+
+ <div class="section" id="clangformat">
+<h1>ClangFormat<a class="headerlink" href="#clangformat" title="Permalink to this headline">¶</a></h1>
+<p><cite>ClangFormat</cite> describes a set of tools that are built on top of
+<a class="reference internal" href="LibFormat.html"><em>LibFormat</em></a>. It can support your workflow in a variety of ways including a
+standalone tool and editor integrations.</p>
+<div class="section" id="standalone-tool">
+<h2>Standalone Tool<a class="headerlink" href="#standalone-tool" title="Permalink to this headline">¶</a></h2>
+<p><strong class="program">clang-format</strong> is located in <cite>clang/tools/clang-format</cite> and can be used
+to format C/C++/Obj-C code.</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="gp">$</span> clang-format -help
+<span class="go">OVERVIEW: A tool to format C/C++/Java/JavaScript/Objective-C/Protobuf code.</span>
+
+<span class="go">If no arguments are specified, it formats the code from standard input</span>
+<span class="go">and writes the result to the standard output.</span>
+<span class="go">If <file>s are given, it reformats the files. If -i is specified</span>
+<span class="go">together with <file>s, the files are edited in-place. Otherwise, the</span>
+<span class="go">result is written to the standard output.</span>
+
+<span class="go">USAGE: clang-format [options] [<file> ...]</span>
+
+<span class="go">OPTIONS:</span>
+
+<span class="go">Clang-format options:</span>
+
+<span class="go"> -assume-filename=<string> - When reading from stdin, clang-format assumes this</span>
+<span class="go"> filename to look for a style config file (with</span>
+<span class="go"> -style=file) and to determine the language.</span>
+<span class="go"> -cursor=<uint> - The position of the cursor when invoking</span>
+<span class="go"> clang-format from an editor integration</span>
+<span class="go"> -dump-config - Dump configuration options to stdout and exit.</span>
+<span class="go"> Can be used with -style option.</span>
+<span class="go"> -fallback-style=<string> - The name of the predefined style used as a</span>
+<span class="go"> fallback in case clang-format is invoked with</span>
+<span class="go"> -style=file, but can not find the .clang-format</span>
+<span class="go"> file to use.</span>
+<span class="go"> Use -fallback-style=none to skip formatting.</span>
+<span class="go"> -i - Inplace edit <file>s, if specified.</span>
+<span class="go"> -length=<uint> - Format a range of this length (in bytes).</span>
+<span class="go"> Multiple ranges can be formatted by specifying</span>
+<span class="go"> several -offset and -length pairs.</span>
+<span class="go"> When only a single -offset is specified without</span>
+<span class="go"> -length, clang-format will format up to the end</span>
+<span class="go"> of the file.</span>
+<span class="go"> Can only be used with one input file.</span>
+<span class="go"> -lines=<string> - <start line>:<end line> - format a range of</span>
+<span class="go"> lines (both 1-based).</span>
+<span class="go"> Multiple ranges can be formatted by specifying</span>
+<span class="go"> several -lines arguments.</span>
+<span class="go"> Can't be used with -offset and -length.</span>
+<span class="go"> Can only be used with one input file.</span>
+<span class="go"> -offset=<uint> - Format a range starting at this byte offset.</span>
+<span class="go"> Multiple ranges can be formatted by specifying</span>
+<span class="go"> several -offset and -length pairs.</span>
+<span class="go"> Can only be used with one input file.</span>
+<span class="go"> -output-replacements-xml - Output replacements as XML.</span>
+<span class="go"> -sort-includes - Sort touched include lines</span>
+<span class="go"> -style=<string> - Coding style, currently supports:</span>
+<span class="go"> LLVM, Google, Chromium, Mozilla, WebKit.</span>
+<span class="go"> Use -style=file to load style configuration from</span>
+<span class="go"> .clang-format file located in one of the parent</span>
+<span class="go"> directories of the source file (or current</span>
+<span class="go"> directory for stdin).</span>
+<span class="go"> Use -style="{key: value, ...}" to set specific</span>
+<span class="go"> parameters, e.g.:</span>
+<span class="go"> -style="{BasedOnStyle: llvm, IndentWidth: 8}"</span>
+
+<span class="go">Generic Options:</span>
+
+<span class="go"> -help - Display available options (-help-hidden for more)</span>
+<span class="go"> -help-list - Display list of available options (-help-list-hidden for more)</span>
+<span class="go"> -version - Display the version of this program</span>
+</pre></div>
+</div>
+<p>When the desired code formatting style is different from the available options,
+the style can be customized using the <tt class="docutils literal"><span class="pre">-style="{key:</span> <span class="pre">value,</span> <span class="pre">...}"</span></tt> option or
+by putting your style configuration in the <tt class="docutils literal"><span class="pre">.clang-format</span></tt> or <tt class="docutils literal"><span class="pre">_clang-format</span></tt>
+file in your project’s directory and using <tt class="docutils literal"><span class="pre">clang-format</span> <span class="pre">-style=file</span></tt>.</p>
+<p>An easy way to create the <tt class="docutils literal"><span class="pre">.clang-format</span></tt> file is:</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="go">clang-format -style=llvm -dump-config > .clang-format</span>
+</pre></div>
+</div>
+<p>Available style options are described in <a class="reference internal" href="ClangFormatStyleOptions.html"><em>Clang-Format Style Options</em></a>.</p>
+</div>
+<div class="section" id="vim-integration">
+<h2>Vim Integration<a class="headerlink" href="#vim-integration" title="Permalink to this headline">¶</a></h2>
+<p>There is an integration for <strong class="program">vim</strong> which lets you run the
+<strong class="program">clang-format</strong> standalone tool on your current buffer, optionally
+selecting regions to reformat. The integration has the form of a <cite>python</cite>-file
+which can be found under <cite>clang/tools/clang-format/clang-format.py</cite>.</p>
+<p>This can be integrated by adding the following to your <cite>.vimrc</cite>:</p>
+<div class="highlight-vim"><div class="highlight"><pre>map <span class="p"><</span>C<span class="p">-</span>K<span class="p">></span> :<span class="k">pyf</span> <span class="p"><</span><span class="nb">path</span><span class="p">-</span><span class="k">to</span><span class="p">-</span>this<span class="p">-</span><span class="k">file</span><span class="p">></span>/clang<span class="p">-</span>format.<span class="k">py</span><span class="p"><</span><span class="k">cr</span><span class="p">></span>
+imap <span class="p"><</span>C<span class="p">-</span>K<span class="p">></span> <span class="p"><</span><span class="k">c</span><span class="p">-</span><span class="k">o</span><span class="p">></span>:<span class="k">pyf</span> <span class="p"><</span><span class="nb">path</span><span class="p">-</span><span class="k">to</span><span class="p">-</span>this<span class="p">-</span><span class="k">file</span><span class="p">></span>/clang<span class="p">-</span>format.<span class="k">py</span><span class="p"><</span><span class="k">cr</span><span class="p">></span>
+</pre></div>
+</div>
+<p>The first line enables <strong class="program">clang-format</strong> for NORMAL and VISUAL mode, the
+second line adds support for INSERT mode. Change “C-K” to another binding if
+you need <strong class="program">clang-format</strong> on a different key (C-K stands for Ctrl+k).</p>
+<p>With this integration you can press the bound key and clang-format will
+format the current line in NORMAL and INSERT mode or the selected region in
+VISUAL mode. The line or region is extended to the next bigger syntactic
+entity.</p>
+<p>It operates on the current, potentially unsaved buffer and does not create
+or save any files. To revert a formatting, just undo.</p>
+</div>
+<div class="section" id="emacs-integration">
+<h2>Emacs Integration<a class="headerlink" href="#emacs-integration" title="Permalink to this headline">¶</a></h2>
+<p>Similar to the integration for <strong class="program">vim</strong>, there is an integration for
+<strong class="program">emacs</strong>. It can be found at <cite>clang/tools/clang-format/clang-format.el</cite>
+and used by adding this to your <cite>.emacs</cite>:</p>
+<div class="highlight-common-lisp"><div class="highlight"><pre><span class="p">(</span><span class="nb">load</span> <span class="s">"<path-to-clang>/tools/clang-format/clang-format.el"</span><span class="p">)</span>
+<span class="p">(</span><span class="nv">global-set-key</span> <span class="nv">[C-M-tab]</span> <span class="ss">'clang-format-region</span><span class="p">)</span>
+</pre></div>
+</div>
+<p>This binds the function <cite>clang-format-region</cite> to C-M-tab, which then formats the
+current line or selected region.</p>
+</div>
+<div class="section" id="bbedit-integration">
+<h2>BBEdit Integration<a class="headerlink" href="#bbedit-integration" title="Permalink to this headline">¶</a></h2>
+<p><strong class="program">clang-format</strong> cannot be used as a text filter with BBEdit, but works
+well via a script. The AppleScript to do this integration can be found at
+<cite>clang/tools/clang-format/clang-format-bbedit.applescript</cite>; place a copy in
+<cite>~/Library/Application Support/BBEdit/Scripts</cite>, and edit the path within it to
+point to your local copy of <strong class="program">clang-format</strong>.</p>
+<p>With this integration you can select the script from the Script menu and
+<strong class="program">clang-format</strong> will format the selection. Note that you can rename the
+menu item by renaming the script, and can assign the menu item a keyboard
+shortcut in the BBEdit preferences, under Menus & Shortcuts.</p>
+</div>
+<div class="section" id="visual-studio-integration">
+<h2>Visual Studio Integration<a class="headerlink" href="#visual-studio-integration" title="Permalink to this headline">¶</a></h2>
+<p>Download the latest Visual Studio extension from the <a class="reference external" href="http://llvm.org/builds/">alpha build site</a>. The default key-binding is Ctrl-R,Ctrl-F.</p>
+</div>
+<div class="section" id="script-for-patch-reformatting">
+<h2>Script for patch reformatting<a class="headerlink" href="#script-for-patch-reformatting" title="Permalink to this headline">¶</a></h2>
+<p>The python script <cite>clang/tools/clang-format-diff.py</cite> parses the output of
+a unified diff and reformats all contained lines with <strong class="program">clang-format</strong>.</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="go">usage: clang-format-diff.py [-h] [-i] [-p NUM] [-regex PATTERN] [-style STYLE]</span>
+
+<span class="go">Reformat changed lines in diff. Without -i option just output the diff that</span>
+<span class="go">would be introduced.</span>
+
+<span class="go">optional arguments:</span>
+<span class="go"> -h, --help show this help message and exit</span>
+<span class="go"> -i apply edits to files instead of displaying a diff</span>
+<span class="go"> -p NUM strip the smallest prefix containing P slashes</span>
+<span class="go"> -regex PATTERN custom pattern selecting file paths to reformat</span>
+<span class="go"> -style STYLE formatting style to apply (LLVM, Google, Chromium, Mozilla,</span>
+<span class="go"> WebKit)</span>
+</pre></div>
+</div>
+<p>So to reformat all the lines in the latest <strong class="program">git</strong> commit, just do:</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="go">git diff -U0 HEAD^ | clang-format-diff.py -i -p1</span>
+</pre></div>
+</div>
+<p>In an SVN client, you can do:</p>
+<div class="highlight-console"><div class="highlight"><pre><span class="go">svn diff --diff-cmd=diff -x-U0 | clang-format-diff.py -i</span>
+</pre></div>
+</div>
+<p>The <em class="xref std std-option">-U0</em> will create a diff without context lines (the script would format
+those as well).</p>
+</div>
+</div>
+
+
+ </div>
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