[llvm-commits] [llvm] r95723 - in /llvm/trunk/examples: CMakeLists.txt ExceptionDemo/ ExceptionDemo/CMakeLists.txt ExceptionDemo/ExceptionDemo.cpp ExceptionDemo/Makefile Makefile
Daniel Dunbar
daniel at zuster.org
Tue Feb 9 17:26:09 PST 2010
Hi Garrison,
Can you change the CMake files to make sure this example doesn't try
and get built on Windows? See here:
http://google1.osuosl.org:8011/builders/clang-i686-xp-msvc9/builds/3779
- Daniel
On Tue, Feb 9, 2010 at 3:22 PM, Garrison Venn <gvenn.cfe.dev at gmail.com> wrote:
> Author: gvenn
> Date: Tue Feb 9 17:22:43 2010
> New Revision: 95723
>
> URL: http://llvm.org/viewvc/llvm-project?rev=95723&view=rev
> Log:
> Adds a JIT based exception handling example to the examples directory.
> Both zero cost example domain specific, and C++ foreign exception handling are
> shown. The example's documentation fully explains how to run the example.
>
> Notes:
>
> 1) The code uses an extremely simple type info model.
> 2) Only a single landing pad is used per unwind edge
> (one call to llvm.eh.selector)
> 3) llvm.eh.selector support for filter arguments is not given.
> 4) llvm.eh.typeid.for is not used.
> 5) Forced unwind behavior is not supported.
> 6) Very little if any error handling is given.
> 7) __attribute__((__aligned__)) is used.
> 8) The code uses parts from the llvm compiler-rt project and
> the llvm Kaleidoscope example.
> 9) The code has not been ported or tested on WINDOWS.
> 10) The code was not tested with a cmake build.
> 11) The code was tested for a debug build on 32bit X86 CentOS LINUX,
> and both a debug and release build on OS X 10.6.2 (64bit).
>
> Added:
> llvm/trunk/examples/ExceptionDemo/
> llvm/trunk/examples/ExceptionDemo/CMakeLists.txt
> llvm/trunk/examples/ExceptionDemo/ExceptionDemo.cpp
> llvm/trunk/examples/ExceptionDemo/Makefile
> Modified:
> llvm/trunk/examples/CMakeLists.txt
> llvm/trunk/examples/Makefile
>
> Modified: llvm/trunk/examples/CMakeLists.txt
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/CMakeLists.txt?rev=95723&r1=95722&r2=95723&view=diff
>
> ==============================================================================
> --- llvm/trunk/examples/CMakeLists.txt (original)
> +++ llvm/trunk/examples/CMakeLists.txt Tue Feb 9 17:22:43 2010
> @@ -3,6 +3,7 @@
> add_subdirectory(HowToUseJIT)
> add_subdirectory(Kaleidoscope)
> add_subdirectory(ModuleMaker)
> +add_subdirectory(ExceptionDemo)
>
> include(CheckIncludeFile)
> check_include_file(pthread.h HAVE_PTHREAD_H)
>
> Added: llvm/trunk/examples/ExceptionDemo/CMakeLists.txt
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/ExceptionDemo/CMakeLists.txt?rev=95723&view=auto
>
> ==============================================================================
> --- llvm/trunk/examples/ExceptionDemo/CMakeLists.txt (added)
> +++ llvm/trunk/examples/ExceptionDemo/CMakeLists.txt Tue Feb 9 17:22:43 2010
> @@ -0,0 +1,5 @@
> +set(LLVM_LINK_COMPONENTS jit nativecodegen)
> +
> +add_llvm_example(ExceptionDemo
> + ExceptionDemo.cpp
> + )
>
> Added: llvm/trunk/examples/ExceptionDemo/ExceptionDemo.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/ExceptionDemo/ExceptionDemo.cpp?rev=95723&view=auto
>
> ==============================================================================
> --- llvm/trunk/examples/ExceptionDemo/ExceptionDemo.cpp (added)
> +++ llvm/trunk/examples/ExceptionDemo/ExceptionDemo.cpp Tue Feb 9 17:22:43 2010
> @@ -0,0 +1,2028 @@
> +//===-- examples/ExceptionDemo/ExceptionDemo.cpp -
> +// An example use of the llvm Exception mechanism --===//
> +//
> +// The LLVM Compiler Infrastructure
> +//
> +// This file is distributed under the University of Illinois Open Source
> +// License. See LICENSE.TXT for details.
> +//
> +//===--------------------------------------------------------------------===//
> +//
> +// Demo program which implements an example LLVM exception implementation, and
> +// shows several test cases including the handling of foreign exceptions.
> +// It is run with type info types arguments to throw. A test will
> +// be run for each given type info type. While type info types with the value
> +// of -1 will trigger a foreign C++ exception to be thrown; type info types
> +// <= 6 and >= 1 will cause the associated generated exceptions to be thrown
> +// and caught by generated test functions; and type info types > 6
> +// will result in exceptions which pass through to the test harness. All other
> +// type info types are not supported and could cause a crash. In all cases,
> +// the "finally" blocks of every generated test functions will executed
> +// regardless of whether or not that test function ignores or catches the
> +// thrown exception.
> +//
> +// examples:
> +//
> +// ExceptionDemo
> +//
> +// causes a usage to be printed to stderr
> +//
> +// ExceptionDemo 2 3 7 -1
> +//
> +// results in the following cases:
> +// - Value 2 causes an exception with a type info type of 2 to be
> +// thrown and caught by an inner generated test function.
> +// - Value 3 causes an exception with a type info type of 3 to be
> +// thrown and caught by an outer generated test function.
> +// - Value 7 causes an exception with a type info type of 7 to be
> +// thrown and NOT be caught by any generated function.
> +// - Value -1 causes a foreign C++ exception to be thrown and not be
> +// caught by any generated function
> +//
> +// Cases -1 and 7 are caught by a C++ test harness where the validity of
> +// of a C++ catch(...) clause catching a generated exception with a
> +// type info type of 7 is questionable.
> +//
> +// This code uses code from the llvm compiler-rt project and the llvm
> +// Kaleidoscope project.
> +//
> +//===--------------------------------------------------------------------===//
> +
> +
> +#include "llvm/LLVMContext.h"
> +#include "llvm/DerivedTypes.h"
> +#include "llvm/ExecutionEngine/ExecutionEngine.h"
> +#include "llvm/ExecutionEngine/JIT.h"
> +#include "llvm/Module.h"
> +#include "llvm/PassManager.h"
> +#include "llvm/Intrinsics.h"
> +#include "llvm/Analysis/Verifier.h"
> +#include "llvm/Target/TargetData.h"
> +#include "llvm/Target/TargetSelect.h"
> +#include "llvm/Target/TargetOptions.h"
> +#include "llvm/Transforms/Scalar.h"
> +#include "llvm/Support/IRBuilder.h"
> +#include "llvm/Support/Dwarf.h"
> +
> +#include <cstdio>
> +#include <string>
> +#include <sstream>
> +#include <map>
> +#include <vector>
> +#include <stdexcept>
> +
> +
> +#ifndef USE_GLOBAL_STR_CONSTS
> +#define USE_GLOBAL_STR_CONSTS true
> +#endif
> +
> +// System C++ ABI unwind types from:
> +// http://refspecs.freestandards.org/abi-eh-1.21.html
> +
> +extern "C" {
> +
> +typedef enum {
> + _URC_NO_REASON = 0,
> + _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
> + _URC_FATAL_PHASE2_ERROR = 2,
> + _URC_FATAL_PHASE1_ERROR = 3,
> + _URC_NORMAL_STOP = 4,
> + _URC_END_OF_STACK = 5,
> + _URC_HANDLER_FOUND = 6,
> + _URC_INSTALL_CONTEXT = 7,
> + _URC_CONTINUE_UNWIND = 8
> +} _Unwind_Reason_Code;
> +
> +typedef enum {
> + _UA_SEARCH_PHASE = 1,
> + _UA_CLEANUP_PHASE = 2,
> + _UA_HANDLER_FRAME = 4,
> + _UA_FORCE_UNWIND = 8,
> + _UA_END_OF_STACK = 16
> +} _Unwind_Action;
> +
> +struct _Unwind_Exception;
> +
> +typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
> + struct _Unwind_Exception *);
> +
> +struct _Unwind_Exception {
> + uint64_t exception_class;
> + _Unwind_Exception_Cleanup_Fn exception_cleanup;
> +
> + uintptr_t private_1;
> + uintptr_t private_2;
> +
> + // @@@ The IA-64 ABI says that this structure must be double-word aligned.
> + // Taking that literally does not make much sense generically. Instead
> + // we provide the maximum alignment required by any type for the machine.
> +} __attribute__((__aligned__));
> +
> +struct _Unwind_Context;
> +typedef struct _Unwind_Context* _Unwind_Context_t;
> +
> +extern const uint8_t* _Unwind_GetLanguageSpecificData (_Unwind_Context_t c);
> +extern uintptr_t _Unwind_GetGR (_Unwind_Context_t c, int i);
> +extern void _Unwind_SetGR (_Unwind_Context_t c, int i, uintptr_t n);
> +extern void _Unwind_SetIP (_Unwind_Context_t, uintptr_t new_value);
> +extern uintptr_t _Unwind_GetIP (_Unwind_Context_t context);
> +extern uintptr_t _Unwind_GetRegionStart (_Unwind_Context_t context);
> +
> +} // extern "C"
> +
> +//
> +// Example types
> +//
> +
> +/// This is our simplistic type info
> +struct OurExceptionType_t {
> + /// type info type
> + int type;
> +};
> +
> +
> +/// This is our Exception class which relies on a negative offset to calculate
> +/// pointers to its instances from pointers to its unwindException member.
> +///
> +/// Note: The above unwind.h defines struct _Unwind_Exception to be aligned
> +/// on a double word boundary. This is necessary to match the standard:
> +/// http://refspecs.freestandards.org/abi-eh-1.21.html
> +struct OurBaseException_t {
> + struct OurExceptionType_t type;
> +
> + // Note: This is properly aligned in unwind.h
> + struct _Unwind_Exception unwindException;
> +};
> +
> +
> +// Note: Not needed since we are C++
> +typedef struct OurBaseException_t OurException;
> +typedef struct _Unwind_Exception OurUnwindException;
> +
> +//
> +// Various globals used to support typeinfo and generatted exceptions in
> +// general
> +//
> +
> +static std::map<std::string, llvm::Value*> namedValues;
> +
> +int64_t ourBaseFromUnwindOffset;
> +
> +const unsigned char ourBaseExcpClassChars[] =
> + {'o', 'b', 'j', '\0', 'b', 'a', 's', '\0'};
> +
> +
> +static uint64_t ourBaseExceptionClass = 0;
> +
> +static std::vector<std::string> ourTypeInfoNames;
> +static std::map<int, std::string> ourTypeInfoNamesIndex;
> +
> +static llvm::StructType* ourTypeInfoType;
> +static llvm::StructType* ourExceptionType;
> +static llvm::StructType* ourUnwindExceptionType;
> +
> +static llvm::ConstantInt* ourExceptionNotThrownState;
> +static llvm::ConstantInt* ourExceptionThrownState;
> +static llvm::ConstantInt* ourExceptionCaughtState;
> +
> +typedef std::vector<std::string> ArgNames;
> +typedef std::vector<const llvm::Type*> ArgTypes;
> +
> +//
> +// Code Generation Utilities
> +//
> +
> +/// Utility used to create a function, both declarations and definitions
> +/// @param module for module instance
> +/// @param retType function return type
> +/// @param theArgTypes function's ordered argument types
> +/// @param theArgNames function's ordered arguments needed if use of this
> +/// function corresponds to a function definition. Use empty
> +/// aggregate for function declarations.
> +/// @param functName function name
> +/// @param linkage function linkage
> +/// @param declarationOnly for function declarations
> +/// @param isVarArg function uses vararg arguments
> +/// @returns function instance
> +llvm::Function *createFunction(llvm::Module& module,
> + const llvm::Type* retType,
> + const ArgTypes& theArgTypes,
> + const ArgNames& theArgNames,
> + const std::string& functName,
> + llvm::GlobalValue::LinkageTypes linkage,
> + bool declarationOnly,
> + bool isVarArg) {
> + llvm::FunctionType* functType = llvm::FunctionType::get(retType,
> + theArgTypes,
> + isVarArg);
> + llvm::Function* ret = llvm::Function::Create(functType,
> + linkage,
> + functName,
> + &module);
> + if (!ret || declarationOnly)
> + return(ret);
> +
> + namedValues.clear();
> + unsigned i = 0;
> + for (llvm::Function::arg_iterator argIndex = ret->arg_begin();
> + i != theArgNames.size();
> + ++argIndex, ++i) {
> +
> + argIndex->setName(theArgNames[i]);
> + namedValues[theArgNames[i]] = argIndex;
> + }
> +
> + return(ret);
> +}
> +
> +
> +/// Create an alloca instruction in the entry block of
> +/// the parent function. This is used for mutable variables etc.
> +/// @param function parent instance
> +/// @param varName stack variable name
> +/// @param type stack variable type
> +/// @param initWith optional constant initialization value
> +/// @returns AllocaInst instance
> +static llvm::AllocaInst *createEntryBlockAlloca(llvm::Function& function,
> + const std::string &varName,
> + const llvm::Type* type,
> + llvm::Constant* initWith = NULL) {
> + llvm::BasicBlock& block = function.getEntryBlock();
> + llvm::IRBuilder<> tmp(&block, block.begin());
> + llvm::AllocaInst* ret = tmp.CreateAlloca(type, 0, varName.c_str());
> +
> + if (initWith)
> + tmp.CreateStore(initWith, ret);
> +
> + return(ret);
> +}
> +
> +
> +//
> +// Code Generation Utilities End
> +//
> +
> +//
> +// Runtime C Library functions
> +//
> +
> +// Note: using an extern "C" block so that static functions can be used
> +extern "C" {
> +
> +// Note: Better ways to decide on bit width
> +//
> +/// Prints a 32 bit number, according to the format, to stderr.
> +/// @param intToPrint integer to print
> +/// @param format printf like format to use when printing
> +void print32Int(int intToPrint, const char* format) {
> + if (format) {
> + // Note: No NULL check
> + fprintf(stderr, format, intToPrint);
> + }
> + else {
> + // Note: No NULL check
> + fprintf(stderr, "::print32Int(...):NULL arg.\n");
> + }
> +}
> +
> +
> +// Note: Better ways to decide on bit width
> +//
> +/// Prints a 64 bit number, according to the format, to stderr.
> +/// @param intToPrint integer to print
> +/// @param format printf like format to use when printing
> +void print64Int(long int intToPrint, const char* format) {
> + if (format) {
> + // Note: No NULL check
> + fprintf(stderr, format, intToPrint);
> + }
> + else {
> + // Note: No NULL check
> + fprintf(stderr, "::print64Int(...):NULL arg.\n");
> + }
> +}
> +
> +
> +/// Prints a C string to stderr
> +/// @param toPrint string to print
> +void printStr(char* toPrint) {
> + if (toPrint) {
> + fprintf(stderr, "%s", toPrint);
> + }
> + else {
> + fprintf(stderr, "::printStr(...):NULL arg.\n");
> + }
> +}
> +
> +
> +/// Deletes the true previosly allocated exception whose address
> +/// is calculated from the supplied OurBaseException_t::unwindException
> +/// member address. Handles (ignores), NULL pointers.
> +/// @param expToDelete exception to delete
> +void deleteOurException(OurUnwindException* expToDelete) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "deleteOurException(...).\n");
> +#endif
> +
> + if (expToDelete &&
> + (expToDelete->exception_class == ourBaseExceptionClass)) {
> +
> + free(((char*) expToDelete) + ourBaseFromUnwindOffset);
> + }
> +}
> +
> +
> +/// This function is the struct _Unwind_Exception API mandated delete function
> +/// used by foreign exception handlers when deleting our exception
> +/// (OurException), instances.
> +/// @param reason @link http://refspecs.freestandards.org/abi-eh-1.21.html
> +/// @unlink
> +/// @param expToDelete exception instance to delete
> +void deleteFromUnwindOurException(_Unwind_Reason_Code reason,
> + OurUnwindException* expToDelete) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "deleteFromUnwindOurException(...).\n");
> +#endif
> +
> + deleteOurException(expToDelete);
> +}
> +
> +
> +/// Creates (allocates on the heap), an exception (OurException instance),
> +/// of the supplied type info type.
> +/// @param type type info type
> +OurUnwindException* createOurException(int type) {
> + size_t size = sizeof(OurException);
> + OurException* ret = (OurException*) memset(malloc(size), 0, size);
> + (ret->type).type = type;
> + (ret->unwindException).exception_class = ourBaseExceptionClass;
> + (ret->unwindException).exception_cleanup = deleteFromUnwindOurException;
> +
> + return(&(ret->unwindException));
> +}
> +
> +
> +/// Read a uleb128 encoded value and advance pointer
> +/// See Variable Length Data in:
> +/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
> +/// @param data reference variable holding memory pointer to decode from
> +/// @returns decoded value
> +static uintptr_t readULEB128(const uint8_t** data) {
> + uintptr_t result = 0;
> + uintptr_t shift = 0;
> + unsigned char byte;
> + const uint8_t* p = *data;
> +
> + do {
> + byte = *p++;
> + result |= (byte & 0x7f) << shift;
> + shift += 7;
> + }
> + while (byte & 0x80);
> +
> + *data = p;
> +
> + return result;
> +}
> +
> +
> +/// Read a sleb128 encoded value and advance pointer
> +/// See Variable Length Data in:
> +/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
> +/// @param data reference variable holding memory pointer to decode from
> +/// @returns decoded value
> +static uintptr_t readSLEB128(const uint8_t** data) {
> + uintptr_t result = 0;
> + uintptr_t shift = 0;
> + unsigned char byte;
> + const uint8_t* p = *data;
> +
> + do {
> + byte = *p++;
> + result |= (byte & 0x7f) << shift;
> + shift += 7;
> + }
> + while (byte & 0x80);
> +
> + *data = p;
> +
> + if ((byte & 0x40) && (shift < (sizeof(result) << 3))) {
> + result |= (~0 << shift);
> + }
> +
> + return result;
> +}
> +
> +
> +/// Read a pointer encoded value and advance pointer
> +/// See Variable Length Data in:
> +/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
> +/// @param data reference variable holding memory pointer to decode from
> +/// @param encoding dwarf encoding type
> +/// @returns decoded value
> +static uintptr_t readEncodedPointer(const uint8_t** data, uint8_t encoding) {
> + uintptr_t result = 0;
> + const uint8_t* p = *data;
> +
> + if (encoding == llvm::dwarf::DW_EH_PE_omit)
> + return(result);
> +
> + // first get value
> + switch (encoding & 0x0F) {
> + case llvm::dwarf::DW_EH_PE_absptr:
> + result = *((uintptr_t*)p);
> + p += sizeof(uintptr_t);
> + break;
> + case llvm::dwarf::DW_EH_PE_uleb128:
> + result = readULEB128(&p);
> + break;
> + // Note: This case has not been tested
> + case llvm::dwarf::DW_EH_PE_sleb128:
> + result = readSLEB128(&p);
> + break;
> + case llvm::dwarf::DW_EH_PE_udata2:
> + result = *((uint16_t*)p);
> + p += sizeof(uint16_t);
> + break;
> + case llvm::dwarf::DW_EH_PE_udata4:
> + result = *((uint32_t*)p);
> + p += sizeof(uint32_t);
> + break;
> + case llvm::dwarf::DW_EH_PE_udata8:
> + result = *((uint64_t*)p);
> + p += sizeof(uint64_t);
> + break;
> + case llvm::dwarf::DW_EH_PE_sdata2:
> + result = *((int16_t*)p);
> + p += sizeof(int16_t);
> + break;
> + case llvm::dwarf::DW_EH_PE_sdata4:
> + result = *((int32_t*)p);
> + p += sizeof(int32_t);
> + break;
> + case llvm::dwarf::DW_EH_PE_sdata8:
> + result = *((int64_t*)p);
> + p += sizeof(int64_t);
> + break;
> + default:
> + // not supported
> + abort();
> + break;
> + }
> +
> + // then add relative offset
> + switch (encoding & 0x70) {
> + case llvm::dwarf::DW_EH_PE_absptr:
> + // do nothing
> + break;
> + case llvm::dwarf::DW_EH_PE_pcrel:
> + result += (uintptr_t)(*data);
> + break;
> + case llvm::dwarf::DW_EH_PE_textrel:
> + case llvm::dwarf::DW_EH_PE_datarel:
> + case llvm::dwarf::DW_EH_PE_funcrel:
> + case llvm::dwarf::DW_EH_PE_aligned:
> + default:
> + // not supported
> + abort();
> + break;
> + }
> +
> + // then apply indirection
> + if (encoding & llvm::dwarf::DW_EH_PE_indirect) {
> + result = *((uintptr_t*)result);
> + }
> +
> + *data = p;
> +
> + return result;
> +}
> +
> +
> +/// Deals with Dwarf actions matching our type infos
> +/// (OurExceptionType_t instances). Returns whether or not a dwarf emitted
> +/// action matches the supplied exception type. If such a match succeeds,
> +/// the resultAction argument will be set with > 0 index value. Only
> +/// corresponding llvm.eh.selector type info arguments, cleanup arguments
> +/// are supported. Filters are not supported.
> +/// See Variable Length Data in:
> +/// @link http://dwarfstd.org/Dwarf3.pdf @unlink
> +/// Also see @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
> +/// @param resultAction reference variable which will be set with result
> +/// @param classInfo our array of type info pointers (to globals)
> +/// @param actionEntry index into above type info array or 0 (clean up).
> +/// We do not support filters.
> +/// @param exceptionClass exception class (_Unwind_Exception::exception_class)
> +/// of thrown exception.
> +/// @param exceptionObject thrown _Unwind_Exception instance.
> +/// @returns whether or not a type info was found. False is returned if only
> +/// a cleanup was found
> +static bool handleActionValue(int64_t *resultAction,
> + struct OurExceptionType_t **classInfo,
> + uintptr_t actionEntry,
> + uint64_t exceptionClass,
> + struct _Unwind_Exception *exceptionObject) {
> + bool ret = false;
> +
> + if (!resultAction ||
> + !exceptionObject ||
> + (exceptionClass != ourBaseExceptionClass))
> + return(ret);
> +
> + struct OurBaseException_t* excp = (struct OurBaseException_t*)
> + (((char*) exceptionObject) + ourBaseFromUnwindOffset);
> + struct OurExceptionType_t *excpType = &(excp->type);
> + int type = excpType->type;
> +
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleActionValue(...): exceptionObject = <%p>, "
> + "excp = <%p>.\n",
> + exceptionObject,
> + excp);
> +#endif
> +
> + const uint8_t *actionPos = (uint8_t*) actionEntry,
> + *tempActionPos;
> + int64_t typeOffset = 0,
> + actionOffset;
> +
> + for (int i = 0; true; ++i) {
> + // Each emitted dwarf action corresponds to a 2 tuple of
> + // type info address offset, and action offset to the next
> + // emitted action.
> + typeOffset = readSLEB128(&actionPos);
> + tempActionPos = actionPos;
> + actionOffset = readSLEB128(&tempActionPos);
> +
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleActionValue(...):typeOffset: <%lld>, "
> + "actionOffset: <%lld>.\n",
> + typeOffset,
> + actionOffset);
> +#endif
> + assert((typeOffset >= 0) &&
> + "handleActionValue(...):filters are not supported.");
> +
> + // Note: A typeOffset == 0 implies that a cleanup llvm.eh.selector
> + // argument has been matched.
> + if ((typeOffset > 0) &&
> + (type == (classInfo[-typeOffset])->type)) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleActionValue(...):actionValue <%d> found.\n",
> + i);
> +#endif
> + *resultAction = i + 1;
> + ret = true;
> + break;
> + }
> +
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleActionValue(...):actionValue not found.\n");
> +#endif
> + if (!actionOffset)
> + break;
> +
> + actionPos += actionOffset;
> + }
> +
> + return(ret);
> +}
> +
> +
> +/// Deals with the Language specific data portion of the emitted dwarf code.
> +/// See @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
> +/// @param version unsupported (ignored), unwind version
> +/// @param lsda language specific data area
> +/// @param _Unwind_Action actions minimally supported unwind stage
> +/// (forced specifically not supported)
> +/// @param exceptionClass exception class (_Unwind_Exception::exception_class)
> +/// of thrown exception.
> +/// @param exceptionObject thrown _Unwind_Exception instance.
> +/// @param context unwind system context
> +/// @returns minimally supported unwinding control indicator
> +static _Unwind_Reason_Code handleLsda(int version,
> + const uint8_t* lsda,
> + _Unwind_Action actions,
> + uint64_t exceptionClass,
> + struct _Unwind_Exception* exceptionObject,
> + _Unwind_Context_t context) {
> + _Unwind_Reason_Code ret = _URC_CONTINUE_UNWIND;
> +
> + if (!lsda)
> + return(ret);
> +
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleLsda(...):lsda is non-zero.\n");
> +#endif
> +
> + // Get the current instruction pointer and offset it before next
> + // instruction in the current frame which threw the exception.
> + uintptr_t pc = _Unwind_GetIP(context)-1;
> +
> + // Get beginning current frame's code (as defined by the
> + // emitted dwarf code)
> + uintptr_t funcStart = _Unwind_GetRegionStart(context);
> + uintptr_t pcOffset = pc - funcStart;
> + struct OurExceptionType_t** classInfo = NULL;
> +
> + // Note: See JITDwarfEmitter::EmitExceptionTable(...) for corresponding
> + // dwarf emission
> +
> + // Parse LSDA header.
> + uint8_t lpStartEncoding = *lsda++;
> +
> + if (lpStartEncoding != llvm::dwarf::DW_EH_PE_omit) {
> + readEncodedPointer(&lsda, lpStartEncoding);
> + }
> +
> + uint8_t ttypeEncoding = *lsda++;
> + uintptr_t classInfoOffset;
> +
> + if (ttypeEncoding != llvm::dwarf::DW_EH_PE_omit) {
> + // Calculate type info locations in emitted dwarf code which
> + // were flagged by type info arguments to llvm.eh.selector
> + // intrinsic
> + classInfoOffset = readULEB128(&lsda);
> + classInfo = (struct OurExceptionType_t**) (lsda + classInfoOffset);
> + }
> +
> + // Walk call-site table looking for range that
> + // includes current PC.
> +
> + uint8_t callSiteEncoding = *lsda++;
> + uint32_t callSiteTableLength = readULEB128(&lsda);
> + const uint8_t* callSiteTableStart = lsda;
> + const uint8_t* callSiteTableEnd = callSiteTableStart +
> + callSiteTableLength;
> + const uint8_t* actionTableStart = callSiteTableEnd;
> + const uint8_t* callSitePtr = callSiteTableStart;
> +
> + bool foreignException = false;
> +
> + while (callSitePtr < callSiteTableEnd) {
> + uintptr_t start = readEncodedPointer(&callSitePtr,
> + callSiteEncoding);
> + uintptr_t length = readEncodedPointer(&callSitePtr,
> + callSiteEncoding);
> + uintptr_t landingPad = readEncodedPointer(&callSitePtr,
> + callSiteEncoding);
> +
> + // Note: Action value
> + uintptr_t actionEntry = readULEB128(&callSitePtr);
> +
> + if (exceptionClass != ourBaseExceptionClass) {
> + // We have been notified of a foreign exception being thrown,
> + // and we therefore need to execute cleanup landing pads
> + actionEntry = 0;
> + foreignException = true;
> + }
> +
> + if (landingPad == 0) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleLsda(...): No landing pad found.\n");
> +#endif
> +
> + continue; // no landing pad for this entry
> + }
> +
> + if (actionEntry) {
> + actionEntry += ((uintptr_t) actionTableStart) - 1;
> + }
> + else {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleLsda(...):No action table found.\n");
> +#endif
> + }
> +
> + bool exceptionMatched = false;
> +
> + if ((start <= pcOffset) && (pcOffset < (start + length))) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleLsda(...): Landing pad found.\n");
> +#endif
> + int64_t actionValue = 0;
> +
> + if (actionEntry) {
> + exceptionMatched = handleActionValue
> + (
> + &actionValue,
> + classInfo,
> + actionEntry,
> + exceptionClass,
> + exceptionObject
> + );
> + }
> +
> + if (!(actions & _UA_SEARCH_PHASE)) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleLsda(...): installed landing pad "
> + "context.\n");
> +#endif
> +
> + // Found landing pad for the PC.
> + // Set Instruction Pointer to so we re-enter function
> + // at landing pad. The landing pad is created by the
> + // compiler to take two parameters in registers.
> + _Unwind_SetGR(context,
> + __builtin_eh_return_data_regno(0),
> + (uintptr_t)exceptionObject);
> +
> + // Note: this virtual register directly corresponds
> + // to the return of the llvm.eh.selector intrinsic
> + if (!actionEntry || !exceptionMatched) {
> + // We indicate cleanup only
> + _Unwind_SetGR(context,
> + __builtin_eh_return_data_regno(1),
> + 0);
> + }
> + else {
> + // Matched type info index of llvm.eh.selector intrinsic
> + // passed here.
> + _Unwind_SetGR(context,
> + __builtin_eh_return_data_regno(1),
> + actionValue);
> + }
> +
> + // To execute landing pad set here
> + _Unwind_SetIP(context, funcStart + landingPad);
> + ret = _URC_INSTALL_CONTEXT;
> + }
> + else if (exceptionMatched) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleLsda(...): setting handler found.\n");
> +#endif
> + ret = _URC_HANDLER_FOUND;
> + }
> + else {
> + // Note: Only non-clean up handlers are marked as
> + // found. Otherwise the clean up handlers will be
> + // re-found and executed during the clean up
> + // phase.
> +#ifdef DEBUG
> + fprintf(stderr,
> + "handleLsda(...): cleanup handler found.\n");
> +#endif
> + }
> +
> + break;
> + }
> + }
> +
> + return(ret);
> +}
> +
> +
> +/// This is the personality function which is embedded (dwarf emitted), in the
> +/// dwarf unwind info block. Again see: JITDwarfEmitter.cpp.
> +/// See @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
> +/// @param version unsupported (ignored), unwind version
> +/// @param _Unwind_Action actions minimally supported unwind stage
> +/// (forced specifically not supported)
> +/// @param exceptionClass exception class (_Unwind_Exception::exception_class)
> +/// of thrown exception.
> +/// @param exceptionObject thrown _Unwind_Exception instance.
> +/// @param context unwind system context
> +/// @returns minimally supported unwinding control indicator
> +_Unwind_Reason_Code ourPersonality(int version,
> + _Unwind_Action actions,
> + uint64_t exceptionClass,
> + struct _Unwind_Exception* exceptionObject,
> + _Unwind_Context_t context) {
> +#ifdef DEBUG
> + fprintf(stderr,
> + "We are in ourPersonality(...):actions is <%d>.\n",
> + actions);
> +
> + if (actions & _UA_SEARCH_PHASE) {
> + fprintf(stderr, "ourPersonality(...):In search phase.\n");
> + }
> + else {
> + fprintf(stderr, "ourPersonality(...):In non-search phase.\n");
> + }
> +#endif
> +
> + const uint8_t* lsda = (uint8_t*)
> + _Unwind_GetLanguageSpecificData(context);
> +
> +#ifdef DEBUG
> + fprintf(stderr,
> + "ourPersonality(...):lsda = <%p>.\n",
> + lsda);
> +#endif
> +
> + // The real work of the personality function is captured here
> + return(handleLsda(version,
> + lsda,
> + actions,
> + exceptionClass,
> + exceptionObject,
> + context));
> +}
> +
> +
> +/// Generates our _Unwind_Exception class from a given character array.
> +/// thereby handling arbitrary lengths (not in standard), and handling
> +/// embedded \0s.
> +/// See @link http://refspecs.freestandards.org/abi-eh-1.21.html @unlink
> +/// @param classChars char array to encode. NULL values not checkedf
> +/// @param classCharsSize number of chars in classChars. Value is not checked.
> +/// @returns class value
> +uint64_t genClass(const unsigned char classChars[], size_t classCharsSize)
> +{
> + uint64_t ret = classChars[0];
> +
> + for (unsigned i = 1; i < classCharsSize; ++i) {
> + ret <<= 8;
> + ret += classChars[i];
> + }
> +
> + return(ret);
> +}
> +
> +} // extern "C"
> +
> +//
> +// Runtime C Library functions End
> +//
> +
> +//
> +// Code generation functions
> +//
> +
> +/// Generates code to print given constant string
> +/// @param context llvm context
> +/// @param module code for module instance
> +/// @param builder builder instance
> +/// @param toPrint string to print
> +/// @param useGlobal A value of true (default) indicates a GlobalValue is
> +/// generated, and is used to hold the constant string. A value of
> +/// false indicates that the constant string will be stored on the
> +/// stack.
> +void generateStringPrint(llvm::LLVMContext& context,
> + llvm::Module& module,
> + llvm::IRBuilder<>& builder,
> + std::string toPrint,
> + bool useGlobal = true) {
> + llvm::Function *printFunct = module.getFunction("printStr");
> +
> + llvm::Value *stringVar;
> + llvm::Constant* stringConstant =
> + llvm::ConstantArray::get(context, toPrint);
> +
> + if (useGlobal) {
> + // Note: Does not work without allocation
> + stringVar =
> + new llvm::GlobalVariable(module,
> + stringConstant->getType(),
> + true,
> + llvm::GlobalValue::LinkerPrivateLinkage,
> + stringConstant,
> + "");
> + }
> + else {
> + stringVar = builder.CreateAlloca(stringConstant->getType());
> + builder.CreateStore(stringConstant, stringVar);
> + }
> +
> + llvm::Value* cast =
> + builder.CreatePointerCast(stringVar,
> + builder.getInt8Ty()->getPointerTo());
> + builder.CreateCall(printFunct, cast);
> +}
> +
> +
> +/// Generates code to print given runtime integer according to constant
> +/// string format, and a given print function.
> +/// @param context llvm context
> +/// @param module code for module instance
> +/// @param builder builder instance
> +/// @param printFunct function used to "print" integer
> +/// @param toPrint string to print
> +/// @param format printf like formating string for print
> +/// @param useGlobal A value of true (default) indicates a GlobalValue is
> +/// generated, and is used to hold the constant string. A value of
> +/// false indicates that the constant string will be stored on the
> +/// stack.
> +void generateIntegerPrint(llvm::LLVMContext& context,
> + llvm::Module& module,
> + llvm::IRBuilder<>& builder,
> + llvm::Function& printFunct,
> + llvm::Value& toPrint,
> + std::string format,
> + bool useGlobal = true) {
> + llvm::Constant *stringConstant = llvm::ConstantArray::get(context, format);
> + llvm::Value *stringVar;
> +
> + if (useGlobal) {
> + // Note: Does not seem to work without allocation
> + stringVar =
> + new llvm::GlobalVariable(module,
> + stringConstant->getType(),
> + true,
> + llvm::GlobalValue::LinkerPrivateLinkage,
> + stringConstant,
> + "");
> + }
> + else {
> + stringVar = builder.CreateAlloca(stringConstant->getType());
> + builder.CreateStore(stringConstant, stringVar);
> + }
> +
> + llvm::Value* cast =
> + builder.CreateBitCast(stringVar,
> + builder.getInt8Ty()->getPointerTo());
> + builder.CreateCall2(&printFunct, &toPrint, cast);
> +}
> +
> +
> +/// Generates code to handle finally block type semantics: always runs
> +/// regardless of whether a thrown exception is passing through or the
> +/// parent function is simply exiting. In addition to printing some state
> +/// to stderr, this code will resume the exception handling--runs the
> +/// unwind resume block, if the exception has not been previously caught
> +/// by a catch clause, and will otherwise execute the end block (terminator
> +/// block). In addition this function creates the corresponding function's
> +/// stack storage for the exception pointer and catch flag status.
> +/// @param context llvm context
> +/// @param module code for module instance
> +/// @param builder builder instance
> +/// @param toAddTo parent function to add block to
> +/// @param blockName block name of new "finally" block.
> +/// @param functionId output id used for printing
> +/// @param terminatorBlock terminator "end" block
> +/// @param unwindResumeBlock unwind resume block
> +/// @param exceptionCaughtFlag reference exception caught/thrown status storage
> +/// @param exceptionStorage reference to exception pointer storage
> +/// @returns newly created block
> +static llvm::BasicBlock* createFinallyBlock(llvm::LLVMContext& context,
> + llvm::Module& module,
> + llvm::IRBuilder<>& builder,
> + llvm::Function& toAddTo,
> + std::string& blockName,
> + std::string& functionId,
> + llvm::BasicBlock& terminatorBlock,
> + llvm::BasicBlock& unwindResumeBlock,
> + llvm::Value** exceptionCaughtFlag,
> + llvm::Value** exceptionStorage) {
> + assert(exceptionCaughtFlag &&
> + "ExceptionDemo::createFinallyBlock(...):exceptionCaughtFlag "
> + "is NULL");
> + assert(exceptionStorage &&
> + "ExceptionDemo::createFinallyBlock(...):exceptionStorage "
> + "is NULL");
> +
> + *exceptionCaughtFlag =
> + createEntryBlockAlloca(toAddTo,
> + "exceptionCaught",
> + ourExceptionNotThrownState->getType(),
> + ourExceptionNotThrownState);
> +
> + const llvm::PointerType* exceptionStorageType =
> + builder.getInt8Ty()->getPointerTo();
> + *exceptionStorage =
> + createEntryBlockAlloca(toAddTo,
> + "exceptionStorage",
> + exceptionStorageType,
> + llvm::ConstantPointerNull::get(
> + exceptionStorageType));
> +
> + llvm::BasicBlock *ret = llvm::BasicBlock::Create(context,
> + blockName,
> + &toAddTo);
> +
> + builder.SetInsertPoint(ret);
> +
> + std::ostringstream bufferToPrint;
> + bufferToPrint << "Gen: Executing finally block "
> + << blockName
> + << " in "
> + << functionId
> + << std::endl;
> + generateStringPrint(context,
> + module,
> + builder,
> + bufferToPrint.str(),
> + USE_GLOBAL_STR_CONSTS);
> +
> + llvm::SwitchInst* theSwitch =
> + builder.CreateSwitch(builder.CreateLoad(*exceptionCaughtFlag),
> + &terminatorBlock,
> + 2);
> + theSwitch->addCase(ourExceptionCaughtState, &terminatorBlock);
> + theSwitch->addCase(ourExceptionThrownState, &unwindResumeBlock);
> +
> + return(ret);
> +}
> +
> +
> +/// Generates catch block semantics which print a string to indicate type of
> +/// catch executed, sets an exception caught flag, and executes passed in
> +/// end block (terminator block).
> +/// @param context llvm context
> +/// @param module code for module instance
> +/// @param builder builder instance
> +/// @param toAddTo parent function to add block to
> +/// @param blockName block name of new "catch" block.
> +/// @param functionId output id used for printing
> +/// @param terminatorBlock terminator "end" block
> +/// @param exceptionCaughtFlag exception caught/thrown status
> +/// @returns newly created block
> +static llvm::BasicBlock* createCatchBlock(llvm::LLVMContext& context,
> + llvm::Module& module,
> + llvm::IRBuilder<>& builder,
> + llvm::Function& toAddTo,
> + std::string& blockName,
> + std::string& functionId,
> + llvm::BasicBlock& terminatorBlock,
> + llvm::Value& exceptionCaughtFlag) {
> +
> + llvm::BasicBlock *ret = llvm::BasicBlock::Create(context,
> + blockName,
> + &toAddTo);
> +
> + builder.SetInsertPoint(ret);
> +
> + std::ostringstream bufferToPrint;
> + bufferToPrint << "Gen: Executing catch block "
> + << blockName
> + << " in "
> + << functionId
> + << std::endl;
> + generateStringPrint(context,
> + module,
> + builder,
> + bufferToPrint.str(),
> + USE_GLOBAL_STR_CONSTS);
> + builder.CreateStore(ourExceptionCaughtState, &exceptionCaughtFlag);
> + builder.CreateBr(&terminatorBlock);
> +
> + return(ret);
> +}
> +
> +
> +/// Generates a function which invokes a function (toInvoke) and, whose
> +/// unwind block will "catch" the type info types correspondingly held in the
> +/// exceptionTypesToCatch argument. If the toInvoke function throws an
> +/// exception which does not match any type info types contained in
> +/// exceptionTypesToCatch, the generated code will call _Unwind_Resume
> +/// with the raised exception. On the other hand the generated code will
> +/// normally exit if the toInvoke function does not throw an exception.
> +/// The generated "finally" block is always run regardless of the cause of
> +/// the generated function exit.
> +/// The generated function is returned after being verified.
> +/// @param module code for module instance
> +/// @param builder builder instance
> +/// @param fpm a function pass manager holding optional IR to IR
> +/// transformations
> +/// @param toInvoke inner function to invoke
> +/// @param ourId id used to printing purposes
> +/// @param numExceptionsToCatch length of exceptionTypesToCatch array
> +/// @param exceptionTypesToCatch array of type info types to "catch"
> +/// @returns generated function
> +static
> +llvm::Function* createCatchWrappedInvokeFunction(llvm::Module& module,
> + llvm::IRBuilder<>& builder,
> + llvm::FunctionPassManager& fpm,
> + llvm::Function& toInvoke,
> + std::string ourId,
> + unsigned numExceptionsToCatch,
> + unsigned exceptionTypesToCatch[]) {
> +
> + llvm::LLVMContext& context = module.getContext();
> + llvm::Function *toPrint32Int = module.getFunction("print32Int");
> +
> + ArgTypes argTypes;
> + argTypes.push_back(builder.getInt32Ty());
> +
> + ArgNames argNames;
> + argNames.push_back("exceptTypeToThrow");
> +
> + llvm::Function* ret = createFunction(module,
> + builder.getVoidTy(),
> + argTypes,
> + argNames,
> + ourId,
> + llvm::Function::ExternalLinkage,
> + false,
> + false);
> +
> + // Block which calls invoke
> + llvm::BasicBlock *entryBlock = llvm::BasicBlock::Create(context,
> + "entry",
> + ret);
> + // Normal block for invoke
> + llvm::BasicBlock *normalBlock = llvm::BasicBlock::Create(context,
> + "normal",
> + ret);
> + // Unwind block for invoke
> + llvm::BasicBlock *exceptionBlock =
> + llvm::BasicBlock::Create(context, "exception", ret);
> +
> + // Block which routes exception to correct catch handler block
> + llvm::BasicBlock *exceptionRouteBlock =
> + llvm::BasicBlock::Create(context, "exceptionRoute", ret);
> +
> + // Foreign exception handler
> + llvm::BasicBlock *externalExceptionBlock =
> + llvm::BasicBlock::Create(context, "externalException", ret);
> +
> + // Block which calls _Unwind_Resume
> + llvm::BasicBlock *unwindResumeBlock =
> + llvm::BasicBlock::Create(context, "unwindResume", ret);
> +
> + // Clean up block which delete exception if needed
> + llvm::BasicBlock *endBlock =
> + llvm::BasicBlock::Create(context, "end", ret);
> +
> + std::string nextName;
> + std::vector<llvm::BasicBlock*> catchBlocks(numExceptionsToCatch);
> + llvm::Value* exceptionCaughtFlag = NULL;
> + llvm::Value* exceptionStorage = NULL;
> +
> + // Finally block which will branch to unwindResumeBlock if
> + // exception is not caught. Initializes/allocates stack locations.
> + llvm::BasicBlock* finallyBlock = createFinallyBlock(context,
> + module,
> + builder,
> + *ret,
> + nextName = "finally",
> + ourId,
> + *endBlock,
> + *unwindResumeBlock,
> + &exceptionCaughtFlag,
> + &exceptionStorage);
> +
> + for (unsigned i = 0; i < numExceptionsToCatch; ++i) {
> + nextName = ourTypeInfoNames[exceptionTypesToCatch[i]];
> +
> + // One catch block per type info to be caught
> + catchBlocks[i] = createCatchBlock(context,
> + module,
> + builder,
> + *ret,
> + nextName,
> + ourId,
> + *finallyBlock,
> + *exceptionCaughtFlag);
> + }
> +
> + // Entry Block
> +
> + builder.SetInsertPoint(entryBlock);
> +
> + std::vector<llvm::Value*> args;
> + args.push_back(namedValues["exceptTypeToThrow"]);
> + builder.CreateInvoke(&toInvoke,
> + normalBlock,
> + exceptionBlock,
> + args.begin(),
> + args.end());
> +
> + // End Block
> +
> + builder.SetInsertPoint(endBlock);
> +
> + generateStringPrint(context,
> + module,
> + builder,
> + "Gen: In end block: exiting in " + ourId + ".\n",
> + USE_GLOBAL_STR_CONSTS);
> + llvm::Function *deleteOurException =
> + module.getFunction("deleteOurException");
> +
> + // Note: function handles NULL exceptions
> + builder.CreateCall(deleteOurException,
> + builder.CreateLoad(exceptionStorage));
> + builder.CreateRetVoid();
> +
> + // Normal Block
> +
> + builder.SetInsertPoint(normalBlock);
> +
> + generateStringPrint(context,
> + module,
> + builder,
> + "Gen: No exception in " + ourId + "!\n",
> + USE_GLOBAL_STR_CONSTS);
> +
> + // Finally block is always called
> + builder.CreateBr(finallyBlock);
> +
> + // Unwind Resume Block
> +
> + builder.SetInsertPoint(unwindResumeBlock);
> +
> + llvm::Function *resumeOurException =
> + module.getFunction("_Unwind_Resume");
> + builder.CreateCall(resumeOurException,
> + builder.CreateLoad(exceptionStorage));
> + builder.CreateUnreachable();
> +
> + // Exception Block
> +
> + builder.SetInsertPoint(exceptionBlock);
> +
> + llvm::Function *ehException = module.getFunction("llvm.eh.exception");
> +
> + // Retrieve thrown exception
> + llvm::Value* unwindException = builder.CreateCall(ehException);
> +
> + // Store exception and flag
> + builder.CreateStore(unwindException, exceptionStorage);
> + builder.CreateStore(ourExceptionThrownState, exceptionCaughtFlag);
> + llvm::Function *personality = module.getFunction("ourPersonality");
> + llvm::Value* functPtr =
> + builder.CreatePointerCast(personality,
> + builder.getInt8Ty()->getPointerTo());
> +
> + args.clear();
> + args.push_back(unwindException);
> + args.push_back(functPtr);
> +
> + // Note: Skipping index 0
> + for (unsigned i = 0; i < numExceptionsToCatch; ++i) {
> + // Set up type infos to be caught
> + args.push_back(
> + module.getGlobalVariable(
> + ourTypeInfoNames[exceptionTypesToCatch[i]]));
> + }
> +
> + args.push_back(llvm::ConstantInt::get(builder.getInt32Ty(), 0));
> +
> + llvm::Function *ehSelector = module.getFunction("llvm.eh.selector");
> +
> + // Set up this exeption block as the landing pad which will handle
> + // given type infos. See case Intrinsic::eh_selector in
> + // SelectionDAGBuilder::visitIntrinsicCall(...) and AddCatchInfo(...)
> + // implemented in FunctionLoweringInfo.cpp to see how the implementation
> + // handles this call. This landing pad (this exception block), will be
> + // called either because it nees to cleanup (call finally) or a type
> + // info was found which matched the thrown exception.
> + llvm::Value* retTypeInfoIndex = builder.CreateCall(ehSelector,
> + args.begin(),
> + args.end());
> +
> + // Retrieve exception_class member from thrown exception
> + // (_Unwind_Exception instance). This member tells us whether or not
> + // the exception is foreign.
> + llvm::Value* unwindExceptionClass =
> + builder.CreateLoad(
> + builder.CreateStructGEP(
> + builder.CreatePointerCast(
> + unwindException,
> + ourUnwindExceptionType->getPointerTo()),
> + 0));
> +
> + // Branch to the externalExceptionBlock if the exception is foreign or
> + // to a catch router if not. Either way the finally block will be run.
> + builder.CreateCondBr(
> + builder.CreateICmpEQ(unwindExceptionClass,
> + llvm::ConstantInt::get(builder.getInt64Ty(),
> + ourBaseExceptionClass)),
> + exceptionRouteBlock,
> + externalExceptionBlock);
> +
> + // External Exception Block
> +
> + builder.SetInsertPoint(externalExceptionBlock);
> +
> + generateStringPrint(context,
> + module,
> + builder,
> + "Gen: Foreign exception received.\n",
> + USE_GLOBAL_STR_CONSTS);
> +
> + // Branch to the finally block
> + builder.CreateBr(finallyBlock);
> +
> + // Exception Route Block
> +
> + builder.SetInsertPoint(exceptionRouteBlock);
> +
> + // Casts exception pointer (_Unwind_Exception instance) to parent
> + // (OurException instance).
> + //
> + // Note: ourBaseFromUnwindOffset is usually negative
> + llvm::Value* typeInfoThrown =
> + builder.CreatePointerCast(
> + builder.CreateConstGEP1_64(unwindException,
> + ourBaseFromUnwindOffset),
> + ourExceptionType->getPointerTo());
> +
> + // Retrieve thrown exception type info type
> + //
> + // Note: Index is not relative to pointer but instead to structure
> + // unlike a true getelementptr (GEP) instruction
> + typeInfoThrown = builder.CreateStructGEP(typeInfoThrown, 0);
> +
> + llvm::Value* typeInfoThrownType =
> + builder.CreateStructGEP(typeInfoThrown, 0);
> +
> + generateIntegerPrint(context,
> + module,
> + builder,
> + *toPrint32Int,
> + *(builder.CreateLoad(typeInfoThrownType)),
> + "Gen: Exception type <%d> received (stack unwound) "
> + " in " +
> + ourId +
> + ".\n",
> + USE_GLOBAL_STR_CONSTS);
> +
> + // Route to matched type info catch block or run cleanup finally block
> + llvm::SwitchInst* switchToCatchBlock =
> + builder.CreateSwitch(retTypeInfoIndex,
> + finallyBlock,
> + numExceptionsToCatch);
> +
> + unsigned nextTypeToCatch;
> +
> + for (unsigned i = 1; i <= numExceptionsToCatch; ++i) {
> + nextTypeToCatch = i - 1;
> + switchToCatchBlock->addCase(llvm::ConstantInt::get(
> + llvm::Type::getInt32Ty(context),
> + i),
> + catchBlocks[nextTypeToCatch]);
> + }
> +
> + llvm::verifyFunction(*ret);
> + fpm.run(*ret);
> +
> + return(ret);
> +}
> +
> +
> +/// Generates function which throws either an exception matched to a runtime
> +/// determined type info type (argument to generated function), or if this
> +/// runtime value matches nativeThrowType, throws a foreign exception by
> +/// calling nativeThrowFunct.
> +/// @param module code for module instance
> +/// @param builder builder instance
> +/// @param fpm a function pass manager holding optional IR to IR
> +/// transformations
> +/// @param ourId id used to printing purposes
> +/// @param nativeThrowType a runtime argument of this value results in
> +/// nativeThrowFunct being called to generate/throw exception.
> +/// @param nativeThrowFunct function which will throw a foreign exception
> +/// if the above nativeThrowType matches generated function's arg.
> +/// @returns generated function
> +static
> +llvm::Function* createThrowExceptionFunction(llvm::Module& module,
> + llvm::IRBuilder<>& builder,
> + llvm::FunctionPassManager& fpm,
> + std::string ourId,
> + int32_t nativeThrowType,
> + llvm::Function& nativeThrowFunct) {
> + llvm::LLVMContext& context = module.getContext();
> + namedValues.clear();
> + ArgTypes unwindArgTypes;
> + unwindArgTypes.push_back(builder.getInt32Ty());
> + ArgNames unwindArgNames;
> + unwindArgNames.push_back("exceptTypeToThrow");
> +
> + llvm::Function *ret = createFunction(module,
> + builder.getVoidTy(),
> + unwindArgTypes,
> + unwindArgNames,
> + ourId,
> + llvm::Function::ExternalLinkage,
> + false,
> + false);
> +
> + // Throws either one of our exception or a native C++ exception depending
> + // on a runtime argument value containing a type info type.
> + llvm::BasicBlock *entryBlock = llvm::BasicBlock::Create(context,
> + "entry",
> + ret);
> + // Throws a foreign exception
> + llvm::BasicBlock *nativeThrowBlock =
> + llvm::BasicBlock::Create(context,
> + "nativeThrow",
> + ret);
> + // Throws one of our Exceptions
> + llvm::BasicBlock *generatedThrowBlock =
> + llvm::BasicBlock::Create(context,
> + "generatedThrow",
> + ret);
> + // Retrieved runtime type info type to throw
> + llvm::Value* exceptionType = namedValues["exceptTypeToThrow"];
> +
> + // nativeThrowBlock block
> +
> + builder.SetInsertPoint(nativeThrowBlock);
> +
> + // Throws foreign exception
> + builder.CreateCall(&nativeThrowFunct, exceptionType);
> + builder.CreateUnreachable();
> +
> + // entry block
> +
> + builder.SetInsertPoint(entryBlock);
> +
> + llvm::Function *toPrint32Int = module.getFunction("print32Int");
> + generateIntegerPrint(context,
> + module,
> + builder,
> + *toPrint32Int,
> + *exceptionType,
> + "\nGen: About to throw exception type <%d> in " +
> + ourId +
> + ".\n",
> + USE_GLOBAL_STR_CONSTS);
> +
> + // Switches on runtime type info type value to determine whether or not
> + // a foreign exception is thrown. Defaults to throwing one of our
> + // generated exceptions.
> + llvm::SwitchInst* theSwitch = builder.CreateSwitch(exceptionType,
> + generatedThrowBlock,
> + 1);
> +
> + theSwitch->addCase(llvm::ConstantInt::get(llvm::Type::getInt32Ty(context),
> + nativeThrowType),
> + nativeThrowBlock);
> +
> + // generatedThrow block
> +
> + builder.SetInsertPoint(generatedThrowBlock);
> +
> + llvm::Function *createOurException =
> + module.getFunction("createOurException");
> + llvm::Function *raiseOurException =
> + module.getFunction("_Unwind_RaiseException");
> +
> + // Creates exception to throw with runtime type info type.
> + llvm::Value* exception =
> + builder.CreateCall(createOurException,
> + namedValues["exceptTypeToThrow"]);
> +
> + // Throw generated Exception
> + builder.CreateCall(raiseOurException, exception);
> + builder.CreateUnreachable();
> +
> + llvm::verifyFunction(*ret);
> + fpm.run(*ret);
> +
> + return(ret);
> +}
> +
> +static void createStandardUtilityFunctions(unsigned numTypeInfos,
> + llvm::Module& module,
> + llvm::IRBuilder<>& builder);
> +
> +/// Creates test code by generating and organizing these functions into the
> +/// test case. The test case consists of an outer function setup to invoke
> +/// an inner function within an environment having multiple catch and single
> +/// finally blocks. This inner function is also setup to invoke a throw
> +/// function within an evironment similar in nature to the outer function's
> +/// catch and finally blocks. Each of these two functions catch mutually
> +/// exclusive subsets (even or odd) of the type info types configured
> +/// for this this. All generated functions have a runtime argument which
> +/// holds a type info type to throw that each function takes and passes it
> +/// to the inner one if such a inner function exists. This type info type is
> +/// looked at by the generated throw function to see whether or not it should
> +/// throw a generated exception with the same type info type, or instead call
> +/// a supplied a function which in turn will throw a foreign exception.
> +/// @param module code for module instance
> +/// @param builder builder instance
> +/// @param fpm a function pass manager holding optional IR to IR
> +/// transformations
> +/// @param nativeThrowFunctName name of external function which will throw
> +/// a foreign exception
> +/// @returns outermost generated test function.
> +llvm::Function* createUnwindExceptionTest(llvm::Module& module,
> + llvm::IRBuilder<>& builder,
> + llvm::FunctionPassManager& fpm,
> + std::string nativeThrowFunctName) {
> + // Number of type infos to generate
> + unsigned numTypeInfos = 6;
> +
> + // Initialze intrisics and external functions to use along with exception
> + // and type info globals.
> + createStandardUtilityFunctions(numTypeInfos,
> + module,
> + builder);
> + llvm::Function *nativeThrowFunct =
> + module.getFunction(nativeThrowFunctName);
> +
> + // Create exception throw function using the value ~0 to cause
> + // foreign exceptions to be thrown.
> + llvm::Function* throwFunct =
> + createThrowExceptionFunction(module,
> + builder,
> + fpm,
> + "throwFunct",
> + ~0,
> + *nativeThrowFunct);
> + // Inner function will catch even type infos
> + unsigned innerExceptionTypesToCatch[] = {6, 2, 4};
> + size_t numExceptionTypesToCatch = sizeof(innerExceptionTypesToCatch) /
> + sizeof(unsigned);
> +
> + // Generate inner function.
> + llvm::Function* innerCatchFunct =
> + createCatchWrappedInvokeFunction(module,
> + builder,
> + fpm,
> + *throwFunct,
> + "innerCatchFunct",
> + numExceptionTypesToCatch,
> + innerExceptionTypesToCatch);
> +
> + // Outer function will catch odd type infos
> + unsigned outerExceptionTypesToCatch[] = {3, 1, 5};
> + numExceptionTypesToCatch = sizeof(outerExceptionTypesToCatch) /
> + sizeof(unsigned);
> +
> + // Generate outer function
> + llvm::Function* outerCatchFunct =
> + createCatchWrappedInvokeFunction(module,
> + builder,
> + fpm,
> + *innerCatchFunct,
> + "outerCatchFunct",
> + numExceptionTypesToCatch,
> + outerExceptionTypesToCatch);
> +
> + // Return outer function to run
> + return(outerCatchFunct);
> +}
> +
> +
> +/// Represents our foreign exceptions
> +class OurCppRunException : public std::runtime_error {
> +public:
> + OurCppRunException(const std::string reason) :
> + std::runtime_error(reason) {}
> +
> + OurCppRunException (const OurCppRunException& toCopy) :
> + std::runtime_error(toCopy) {}
> +
> + OurCppRunException& operator = (const OurCppRunException& toCopy) {
> + return(reinterpret_cast<OurCppRunException&>(
> + std::runtime_error::operator = (toCopy)
> + ));
> + }
> +
> + ~OurCppRunException (void) throw () {};
> +};
> +
> +
> +/// Throws foreign C++ exception.
> +/// @param ignoreIt unused parameter that allows function to match implied
> +/// generated function contract.
> +extern "C"
> +void throwCppException (int32_t ignoreIt) {
> + throw(OurCppRunException("thrown by throwCppException(...)"));
> +}
> +
> +typedef void (*OurExceptionThrowFunctType) (int32_t typeToThrow);
> +
> +/// This is a test harness which runs test by executing generated
> +/// function with a type info type to throw. Harness wraps the excecution
> +/// of generated function in a C++ try catch clause.
> +/// @param engine execution engine to use for executing generated function.
> +/// This demo program expects this to be a JIT instance for demo
> +/// purposes.
> +/// @param function generated test function to run
> +/// @param typeToThrow type info type of generated exception to throw, or
> +/// indicator to cause foreign exception to be thrown.
> +static
> +void runExceptionThrow(llvm::ExecutionEngine* engine,
> + llvm::Function* function,
> + int32_t typeToThrow) {
> +
> + // Find test's function pointer
> + OurExceptionThrowFunctType functPtr =
> + reinterpret_cast<OurExceptionThrowFunctType>(
> + reinterpret_cast<intptr_t>(
> + engine->getPointerToFunction(function)
> + )
> + );
> +
> + try {
> + // Run test
> + (*functPtr)(typeToThrow);
> + }
> + catch (OurCppRunException exc) {
> + // Catch foreign C++ exception
> + fprintf(stderr,
> + "\nrunExceptionThrow(...):In C++ catch OurCppRunException "
> + "with reason: %s.\n",
> + exc.what());
> + }
> + catch (...) {
> + // Catch all exceptions including our generated ones. I'm not sure
> + // why this latter functionality should work, as it seems that
> + // our exceptions should be foreign to C++ (the _Unwind_Exception::
> + // exception_class should be different from the one used by C++), and
> + // therefore C++ should ignore the generated exceptions.
> +
> + fprintf(stderr,
> + "\nrunExceptionThrow(...):In C++ catch all.\n");
> + }
> +}
> +
> +//
> +// End test functions
> +//
> +
> +/// This initialization routine creates type info globals and
> +/// adds external function declarations to module.
> +/// @param numTypeInfos number of linear type info associated type info types
> +/// to create as GlobalVariable instances, starting with the value 1.
> +/// @param module code for module instance
> +/// @param builder builder instance
> +static void createStandardUtilityFunctions(unsigned numTypeInfos,
> + llvm::Module& module,
> + llvm::IRBuilder<>& builder) {
> +
> + llvm::LLVMContext& context = module.getContext();
> +
> + // Exception initializations
> +
> + // Setup exception catch state
> + ourExceptionNotThrownState =
> + llvm::ConstantInt::get(llvm::Type::getInt8Ty(context), 0),
> + ourExceptionThrownState =
> + llvm::ConstantInt::get(llvm::Type::getInt8Ty(context), 1),
> + ourExceptionCaughtState =
> + llvm::ConstantInt::get(llvm::Type::getInt8Ty(context), 2),
> +
> +
> + // Create our type info type
> + ourTypeInfoType = llvm::StructType::get(context,
> + builder.getInt32Ty(),
> + NULL);
> +
> + // Create OurException type
> + ourExceptionType = llvm::StructType::get(context,
> + ourTypeInfoType,
> + NULL);
> +
> + // Create portion of _Unwind_Exception type
> + //
> + // Note: Declaring only a portion of the _Unwind_Exception struct.
> + // Does this cause problems?
> + ourUnwindExceptionType = llvm::StructType::get(context,
> + builder.getInt64Ty(),
> + NULL);
> + struct OurBaseException_t dummyException;
> +
> + // Calculate offset of OurException::unwindException member.
> + ourBaseFromUnwindOffset = ((uintptr_t) &dummyException) -
> + ((uintptr_t) &(dummyException.unwindException));
> +
> +#ifdef DEBUG
> + fprintf(stderr,
> + "createStandardUtilityFunctions(...):ourBaseFromUnwindOffset "
> + "= %lld, sizeof(struct OurBaseException_t) - "
> + "sizeof(struct _Unwind_Exception) = %lu.\n",
> + ourBaseFromUnwindOffset,
> + sizeof(struct OurBaseException_t) -
> + sizeof(struct _Unwind_Exception));
> +#endif
> +
> + size_t numChars = sizeof(ourBaseExcpClassChars) / sizeof(char);
> +
> + // Create our _Unwind_Exception::exception_class value
> + ourBaseExceptionClass = genClass(ourBaseExcpClassChars, numChars);
> +
> + // Type infos
> +
> + std::string baseStr = "typeInfo", typeInfoName;
> + std::ostringstream typeInfoNameBuilder;
> + std::vector<llvm::Constant*> structVals;
> +
> + llvm::Constant *nextStruct;
> + llvm::GlobalVariable* nextGlobal = NULL;
> +
> + // Generate each type info
> + //
> + // Note: First type info is not used.
> + for (unsigned i = 0; i <= numTypeInfos; ++i) {
> + structVals.clear();
> + structVals.push_back(llvm::ConstantInt::get(builder.getInt32Ty(), i));
> + nextStruct = llvm::ConstantStruct::get(ourTypeInfoType, structVals);
> +
> + typeInfoNameBuilder.str("");
> + typeInfoNameBuilder << baseStr << i;
> + typeInfoName = typeInfoNameBuilder.str();
> +
> + // Note: Does not seem to work without allocation
> + nextGlobal =
> + new llvm::GlobalVariable(module,
> + ourTypeInfoType,
> + true,
> + llvm::GlobalValue::ExternalLinkage,
> + nextStruct,
> + typeInfoName);
> +
> + ourTypeInfoNames.push_back(typeInfoName);
> + ourTypeInfoNamesIndex[i] = typeInfoName;
> + }
> +
> + ArgNames argNames;
> + ArgTypes argTypes;
> + llvm::Function* funct = NULL;
> +
> + // print32Int
> +
> + const llvm::Type* retType = builder.getVoidTy();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt32Ty());
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> +
> + argNames.clear();
> +
> + createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "print32Int",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + // print64Int
> +
> + retType = builder.getVoidTy();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt64Ty());
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> +
> + argNames.clear();
> +
> + createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "print64Int",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + // printStr
> +
> + retType = builder.getVoidTy();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> +
> + argNames.clear();
> +
> + createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "printStr",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + // throwCppException
> +
> + retType = builder.getVoidTy();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt32Ty());
> +
> + argNames.clear();
> +
> + createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "throwCppException",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + // deleteOurException
> +
> + retType = builder.getVoidTy();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> +
> + argNames.clear();
> +
> + createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "deleteOurException",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + // createOurException
> +
> + retType = builder.getInt8Ty()->getPointerTo();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt32Ty());
> +
> + argNames.clear();
> +
> + createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "createOurException",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + // _Unwind_RaiseException
> +
> + retType = builder.getInt32Ty();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> +
> + argNames.clear();
> +
> + funct = createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "_Unwind_RaiseException",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + funct->addFnAttr(llvm::Attribute::NoReturn);
> +
> + // _Unwind_Resume
> +
> + retType = builder.getInt32Ty();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> +
> + argNames.clear();
> +
> + funct = createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "_Unwind_Resume",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + funct->addFnAttr(llvm::Attribute::NoReturn);
> +
> + // ourPersonality
> +
> + retType = builder.getInt32Ty();
> +
> + argTypes.clear();
> + argTypes.push_back(builder.getInt32Ty());
> + argTypes.push_back(builder.getInt32Ty());
> + argTypes.push_back(builder.getInt64Ty());
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> + argTypes.push_back(builder.getInt8Ty()->getPointerTo());
> +
> + argNames.clear();
> +
> + createFunction(module,
> + retType,
> + argTypes,
> + argNames,
> + "ourPersonality",
> + llvm::Function::ExternalLinkage,
> + true,
> + false);
> +
> + // llvm.eh.selector intrinsic
> +
> + getDeclaration(&module, llvm::Intrinsic::eh_selector);
> +
> + // llvm.eh.exception intrinsic
> +
> + getDeclaration(&module, llvm::Intrinsic::eh_exception);
> +
> + // llvm.eh.typeid.for intrinsic
> +
> + getDeclaration(&module, llvm::Intrinsic::eh_typeid_for);
> +}
> +
> +
> +//===---------------------------------------------------------------------===//
> +// Main test driver code.
> +//===---------------------------------------------------------------------===//
> +
> +/// Demo main routine which takes the type info types to throw. A test will
> +/// be run for each given type info type. While type info types with the value
> +/// of -1 will trigger a foreign C++ exception to be thrown; type info types
> +/// <= 6 and >= 1 will be caught by test functions; and type info types > 6
> +/// will result in exceptions which pass through to the test harness. All other
> +/// type info types are not supported and could cause a crash.
> +int main(int argc, char* argv[]) {
> + if (argc == 1) {
> + fprintf(stderr,
> + "\nUsage: ExceptionDemo <exception type to throw> "
> + "[<type 2>...<type n>].\n"
> + " Each type must have the value of 1 - 6 for "
> + "generated exceptions to be caught;\n"
> + " the value -1 for foreign C++ exceptions to be "
> + "generated and thrown;\n"
> + " or the values > 6 for exceptions to be ignored.\n"
> + "\nTry: ExceptionDemo 2 3 7 -1\n"
> + " for a full test.\n\n");
> + return(0);
> + }
> +
> + // If not set, exception handling will not be turned on
> + llvm::DwarfExceptionHandling = true;
> +
> + llvm::InitializeNativeTarget();
> + llvm::LLVMContext& context = llvm::getGlobalContext();
> + llvm::IRBuilder<> theBuilder(context);
> +
> + // Make the module, which holds all the code.
> + llvm::Module* module = new llvm::Module("my cool jit", context);
> +
> + // Build engine with JIT
> + llvm::EngineBuilder factory(module);
> + factory.setEngineKind(llvm::EngineKind::JIT);
> + factory.setAllocateGVsWithCode(false);
> + llvm::ExecutionEngine* executionEngine = factory.create();
> +
> + {
> + llvm::FunctionPassManager fpm(module);
> +
> + // Set up the optimizer pipeline.
> + // Start with registering info about how the
> + // target lays out data structures.
> + fpm.add(new llvm::TargetData(*executionEngine->getTargetData()));
> +
> + // Optimizations turned on
> +#ifdef ADD_OPT_PASSES
> +
> + // Promote allocas to registers.
> + fpm.add(llvm::createPromoteMemoryToRegisterPass());
> +
> + // Do simple "peephole" optimizations and bit-twiddling optzns.
> + fpm.add(llvm::createInstructionCombiningPass());
> +
> + // Reassociate expressions.
> + fpm.add(llvm::createReassociatePass());
> +
> + // Eliminate Common SubExpressions.
> + fpm.add(llvm::createGVNPass());
> +
> + // Simplify the control flow graph (deleting unreachable
> + // blocks, etc).
> + fpm.add(llvm::createCFGSimplificationPass());
> +#endif // ADD_OPT_PASSES
> +
> + fpm.doInitialization();
> +
> + // Generate test code using function throwCppException(...) as
> + // the function which throws foreign exceptions.
> + llvm::Function* toRun =
> + createUnwindExceptionTest(*module,
> + theBuilder,
> + fpm,
> + "throwCppException");
> +
> + fprintf(stderr, "\nBegin module dump:\n\n");
> +
> + module->dump();
> +
> + fprintf(stderr, "\nEnd module dump:\n");
> +
> + fprintf(stderr, "\n\nBegin Test:\n");
> +
> + for (int i = 1; i < argc; ++i) {
> + // Run test for each argument whose value is the exception
> + // type to throw.
> + runExceptionThrow(executionEngine,
> + toRun,
> + (unsigned) strtoul(argv[i], NULL, 10));
> + }
> +
> + fprintf(stderr, "\nEnd Test:\n\n");
> + }
> +
> + delete executionEngine;
> +
> + return 0;
> +}
> +
>
> Added: llvm/trunk/examples/ExceptionDemo/Makefile
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/ExceptionDemo/Makefile?rev=95723&view=auto
>
> ==============================================================================
> --- llvm/trunk/examples/ExceptionDemo/Makefile (added)
> +++ llvm/trunk/examples/ExceptionDemo/Makefile Tue Feb 9 17:22:43 2010
> @@ -0,0 +1,17 @@
> +##===- examples/ExceptionDemo/Makefile --------------------*- Makefile -*-===##
> +#
> +# The LLVM Compiler Infrastructure
> +#
> +# This file is distributed under the University of Illinois Open Source
> +# License. See LICENSE.TXT for details.
> +#
> +##===---------------------------------------------------------------------===##
> +LEVEL = ../..
> +TOOLNAME = ExceptionDemo
> +EXAMPLE_TOOL = 1
> +
> +LINK_COMPONENTS := jit interpreter nativecodegen
> +
> +include $(LEVEL)/Makefile.common
> +
> +CXXFLAGS += -fexceptions
>
> Modified: llvm/trunk/examples/Makefile
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/examples/Makefile?rev=95723&r1=95722&r2=95723&view=diff
>
> ==============================================================================
> --- llvm/trunk/examples/Makefile (original)
> +++ llvm/trunk/examples/Makefile Tue Feb 9 17:22:43 2010
> @@ -10,7 +10,8 @@
>
> include $(LEVEL)/Makefile.config
>
> -PARALLEL_DIRS:= BrainF Fibonacci HowToUseJIT Kaleidoscope ModuleMaker
> +PARALLEL_DIRS:= BrainF Fibonacci HowToUseJIT Kaleidoscope ModuleMaker \
> + ExceptionDemo
>
> ifeq ($(HAVE_PTHREAD),1)
> PARALLEL_DIRS += ParallelJIT
>
>
> _______________________________________________
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