[cfe-commits] r124360 - in /cfe/trunk: lib/Lex/PPMacroExpansion.cpp lib/StaticAnalyzer/CFRefCount.cpp test/Analysis/retain-release.m www/analyzer/annotations.html
Ted Kremenek
kremenek at apple.com
Wed Jan 26 22:54:14 PST 2011
Author: kremenek
Date: Thu Jan 27 00:54:14 2011
New Revision: 124360
URL: http://llvm.org/viewvc/llvm-project?rev=124360&view=rev
Log:
Hook up attribute ns_consumes_self in the ObjC retain/release checker in the static analyzer.
Modified:
cfe/trunk/lib/Lex/PPMacroExpansion.cpp
cfe/trunk/lib/StaticAnalyzer/CFRefCount.cpp
cfe/trunk/test/Analysis/retain-release.m
cfe/trunk/www/analyzer/annotations.html
Modified: cfe/trunk/lib/Lex/PPMacroExpansion.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Lex/PPMacroExpansion.cpp?rev=124360&r1=124359&r2=124360&view=diff
==============================================================================
--- cfe/trunk/lib/Lex/PPMacroExpansion.cpp (original)
+++ cfe/trunk/lib/Lex/PPMacroExpansion.cpp Thu Jan 27 00:54:14 2011
@@ -536,6 +536,7 @@
.Case("attribute_ext_vector_type", true)
.Case("attribute_ns_returns_not_retained", true)
.Case("attribute_ns_returns_retained", true)
+ .Case("attribute_ns_consumes_self", true)
.Case("attribute_objc_ivar_unused", true)
.Case("attribute_overloadable", true)
.Case("attribute_unavailable_with_message", true)
Modified: cfe/trunk/lib/StaticAnalyzer/CFRefCount.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/StaticAnalyzer/CFRefCount.cpp?rev=124360&r1=124359&r2=124360&view=diff
==============================================================================
--- cfe/trunk/lib/StaticAnalyzer/CFRefCount.cpp (original)
+++ cfe/trunk/lib/StaticAnalyzer/CFRefCount.cpp Thu Jan 27 00:54:14 2011
@@ -467,6 +467,10 @@
/// terminate the path.
bool isEndPath() const { return EndPath; }
+
+ /// Sets the effect on the receiver of the message.
+ void setReceiverEffect(ArgEffect e) { Receiver = e; }
+
/// getReceiverEffect - Returns the effect on the receiver of the call.
/// This is only meaningful if the summary applies to an ObjCMessageExpr*.
ArgEffect getReceiverEffect() const { return Receiver; }
@@ -1219,6 +1223,11 @@
bool isTrackedLoc = false;
+ // Effects on the receiver.
+ if (MD->getAttr<NSConsumesSelfAttr>()) {
+ Summ.setReceiverEffect(DecRefMsg);
+ }
+
// Determine if there is a special return effect for this method.
if (cocoa::isCocoaObjectRef(MD->getResultType())) {
if (MD->getAttr<NSReturnsRetainedAttr>()) {
Modified: cfe/trunk/test/Analysis/retain-release.m
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Analysis/retain-release.m?rev=124360&r1=124359&r2=124360&view=diff
==============================================================================
--- cfe/trunk/test/Analysis/retain-release.m (original)
+++ cfe/trunk/test/Analysis/retain-release.m Thu Jan 27 00:54:14 2011
@@ -13,6 +13,9 @@
#if __has_feature(attribute_cf_returns_not_retained)
#define CF_RETURNS_NOT_RETAINED __attribute__((cf_returns_not_retained))
#endif
+#if __has_feature(attribute_ns_consumes_self)
+#define NS_CONSUMES_SELF __attribute__((ns_consumes_self))
+#endif
//===----------------------------------------------------------------------===//
// The following code is reduced using delta-debugging from Mac OS X headers:
@@ -1211,6 +1214,7 @@
- (NSString*) newString NS_RETURNS_NOT_RETAINED; // no-warning
- (NSString*) newStringNoAttr;
- (int) returnsAnOwnedInt NS_RETURNS_RETAINED; // expected-warning{{'ns_returns_retained' attribute only applies to methods that return an Objective-C object}}
+- (id) pseudoInit NS_CONSUMES_SELF NS_RETURNS_RETAINED;
@end
static int ownership_attribute_doesnt_go_here NS_RETURNS_RETAINED; // expected-warning{{'ns_returns_retained' attribute only applies to functions and methods}}
@@ -1228,6 +1232,19 @@
NSString *str2 = [X newStringNoAttr]; // expected-warning{{leak}}
}
+void testattr2_a() {
+ TestOwnershipAttr *x = [TestOwnershipAttr alloc]; // expected-warning{{leak}}
+}
+
+void testattr2_b() {
+ TestOwnershipAttr *x = [[TestOwnershipAttr alloc] pseudoInit]; // expected-warning{{leak}}
+}
+
+void testattr2_c() {
+ TestOwnershipAttr *x = [[TestOwnershipAttr alloc] pseudoInit]; // no-warning
+ [x release];
+}
+
@interface MyClassTestCFAttr : NSObject {}
- (NSDate*) returnsCFRetained CF_RETURNS_RETAINED;
- (CFDateRef) returnsCFRetainedAsCF CF_RETURNS_RETAINED;
@@ -1401,7 +1418,7 @@
while (error_to_dump != ((void*)0)) {
CFDictionaryRef info;
- info = CFErrorCopyUserInfo(error_to_dump); // expected-warning{{Potential leak of an object allocated on line 1404 and stored into 'info'}}
+ info = CFErrorCopyUserInfo(error_to_dump); // expected-warning{{Potential leak of an object allocated on line 1421 and stored into 'info'}}
if (info != ((void*)0)) {
}
Modified: cfe/trunk/www/analyzer/annotations.html
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/www/analyzer/annotations.html?rev=124360&r1=124359&r2=124360&view=diff
==============================================================================
--- cfe/trunk/www/analyzer/annotations.html (original)
+++ cfe/trunk/www/analyzer/annotations.html Thu Jan 27 00:54:14 2011
@@ -56,6 +56,7 @@
<li><a href="#attr_ns_returns_not_retained">Attribute 'ns_returns_not_retained'</a></li>
<li><a href="#attr_cf_returns_retained">Attribute 'cf_returns_retained'</a></li>
<li><a href="#attr_cf_returns_not_retained">Attribute 'cf_returns_not_retained'</a></li>
+ <li><a href="#attr_ns_consumes_self">Attribute 'ns_consumes_self'</a></li>
</ul>
</li>
</ul>
@@ -350,6 +351,38 @@
#endif
</pre>
+<h4 id="attr_ns_consumes_self">Attribute 'ns_consumes_self'
+(Clang-specific)</h4>
+
+<p>The 'ns_consumes_self' attribute can be placed only on an Objective-C method declaration.
+ It indicates that the receiver of the message is "consumed" (a single reference count decremented)
+ after the message is sent. This matches the semantics of all "init" methods.
+</p>
+
+<p>One use of this attribute is declare your own init-like methods that do not follow the
+ standard Cocoa naming conventions. For example:</p>
+
+<pre class="code_example">
+#ifndef __has_feature
+#define __has_Feature(x) 0 // Compatibility with non-clang compilers.
+#endif
+
+#ifndef NS_CONSUMES_SELF
+#if __has_feature((attribute_ns_consumes_self))
+#else
+#define NS_CONSUMES_SELF
+#endif
+#endif
+
+ at interface MyClass : NSObject
+- initWith:(MyClass *)x;
+- nonstandardInitWith:(MyClass *)x NS_CONSUMES_SELF NS_RETURNS_RETAINED;
+ at end
+</pre>
+
+<p>In this example, <tt>nonstandardInitWith:</tt> has the same ownership semantics as the init method <tt>initWith:</tt>.
+ The static analyzer will observe that the method consumes the receiver, and then returns an object with a +1 retain count.</p>
+
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<h2 id="custom_assertions">Custom Assertion Handlers</h2>
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