lib/CodeGen/BackendUtil.cpp - platform/external/clang - Gitiles

 //===--- BackendUtil.cpp - LLVM Backend Utilities -------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//

 #include "clang/CodeGen/BackendUtil.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/TargetOptions.h"
 #include "clang/Frontend/CodeGenOptions.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
 #include "llvm/Module.h"
 #include "llvm/PassManager.h"
 #include "llvm/Assembly/PrintModulePass.h"
 #include "llvm/Bitcode/ReaderWriter.h"
 #include "llvm/CodeGen/RegAllocRegistry.h"
 #include "llvm/CodeGen/SchedulerRegistry.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FormattedStream.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/StandardPasses.h"
 #include "llvm/Support/Timer.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/SubtargetFeature.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetOptions.h"
 #include "llvm/Target/TargetRegistry.h"
 using namespace clang;
 using namespace llvm;

 namespace {

 class EmitAssemblyHelper {
   Diagnostic &Diags;
   const CodeGenOptions &CodeGenOpts;
   const TargetOptions &TargetOpts;
   Module *TheModule;

   Timer CodeGenerationTime;

   mutable FunctionPassManager *CodeGenPasses;
   mutable PassManager *PerModulePasses;
   mutable FunctionPassManager *PerFunctionPasses;

 private:
   FunctionPassManager *getCodeGenPasses() const {
     if (!CodeGenPasses) {
       CodeGenPasses = new FunctionPassManager(TheModule);
       CodeGenPasses->add(new TargetData(TheModule));
     }
     return CodeGenPasses;
   }

   PassManager *getPerModulePasses() const {
     if (!PerModulePasses) {
       PerModulePasses = new PassManager();
       PerModulePasses->add(new TargetData(TheModule));
     }
     return PerModulePasses;
   }

   FunctionPassManager *getPerFunctionPasses() const {
     if (!PerFunctionPasses) {
       PerFunctionPasses = new FunctionPassManager(TheModule);
       PerFunctionPasses->add(new TargetData(TheModule));
     }
     return PerFunctionPasses;
   }

   void CreatePasses();

   /// AddEmitPasses - Add passes necessary to emit assembly or LLVM IR.
   ///
   /// \return True on success.
   bool AddEmitPasses(BackendAction Action, formatted_raw_ostream &OS);

 public:
   EmitAssemblyHelper(Diagnostic &_Diags,
                      const CodeGenOptions &CGOpts, const TargetOptions &TOpts,
                      Module *M)
     : Diags(_Diags), CodeGenOpts(CGOpts), TargetOpts(TOpts),
       TheModule(M), CodeGenerationTime("Code Generation Time"),
       CodeGenPasses(0), PerModulePasses(0), PerFunctionPasses(0) {}

   ~EmitAssemblyHelper() {
     delete CodeGenPasses;
     delete PerModulePasses;
     delete PerFunctionPasses;
   }

   void EmitAssembly(BackendAction Action, raw_ostream *OS);
 };

 }

 void EmitAssemblyHelper::CreatePasses() {
   unsigned OptLevel = CodeGenOpts.OptimizationLevel;
   CodeGenOptions::InliningMethod Inlining = CodeGenOpts.Inlining;

   // Handle disabling of LLVM optimization, where we want to preserve the
   // internal module before any optimization.
   if (CodeGenOpts.DisableLLVMOpts) {
     OptLevel = 0;
     Inlining = CodeGenOpts.NoInlining;
   }

   // In -O0 if checking is disabled, we don't even have per-function passes.
   if (CodeGenOpts.VerifyModule)
     getPerFunctionPasses()->add(createVerifierPass());

   // Assume that standard function passes aren't run for -O0.
   if (OptLevel > 0)
     llvm::createStandardFunctionPasses(getPerFunctionPasses(), OptLevel);

   llvm::Pass *InliningPass = 0;
   switch (Inlining) {
   case CodeGenOptions::NoInlining: break;
   case CodeGenOptions::NormalInlining: {
     // Set the inline threshold following llvm-gcc.
     //
     // FIXME: Derive these constants in a principled fashion.
     unsigned Threshold = 225;
     if (CodeGenOpts.OptimizeSize)
       Threshold = 75;
     else if (OptLevel > 2)
       Threshold = 275;
     InliningPass = createFunctionInliningPass(Threshold);
     break;
   }
   case CodeGenOptions::OnlyAlwaysInlining:
     InliningPass = createAlwaysInlinerPass();         // Respect always_inline
     break;
   }

   // For now we always create per module passes.
   llvm::createStandardModulePasses(getPerModulePasses(), OptLevel,
                                    CodeGenOpts.OptimizeSize,
                                    CodeGenOpts.UnitAtATime,
                                    CodeGenOpts.UnrollLoops,
                                    CodeGenOpts.SimplifyLibCalls,
                                    /*HaveExceptions=*/true,
                                    InliningPass);
 }

 bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
                                        formatted_raw_ostream &OS) {
   // Create the TargetMachine for generating code.
   std::string Error;
   std::string Triple = TheModule->getTargetTriple();
   const llvm::Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
   if (!TheTarget) {
     Diags.Report(diag::err_fe_unable_to_create_target) << Error;
     return false;
   }

   // FIXME: Expose these capabilities via actual APIs!!!! Aside from just
   // being gross, this is also totally broken if we ever care about
   // concurrency.
   llvm::NoFramePointerElim = CodeGenOpts.DisableFPElim;
   if (CodeGenOpts.FloatABI == "soft")
     llvm::FloatABIType = llvm::FloatABI::Soft;
   else if (CodeGenOpts.FloatABI == "hard")
     llvm::FloatABIType = llvm::FloatABI::Hard;
   else {
     assert(CodeGenOpts.FloatABI.empty() && "Invalid float abi!");
     llvm::FloatABIType = llvm::FloatABI::Default;
   }
   NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;
   llvm::UseSoftFloat = CodeGenOpts.SoftFloat;
   UnwindTablesMandatory = CodeGenOpts.UnwindTables;

   TargetMachine::setAsmVerbosityDefault(CodeGenOpts.AsmVerbose);

   TargetMachine::setFunctionSections(CodeGenOpts.FunctionSections);
   TargetMachine::setDataSections    (CodeGenOpts.DataSections);

   // FIXME: Parse this earlier.
   if (CodeGenOpts.RelocationModel == "static") {
     TargetMachine::setRelocationModel(llvm::Reloc::Static);
   } else if (CodeGenOpts.RelocationModel == "pic") {
     TargetMachine::setRelocationModel(llvm::Reloc::PIC_);
   } else {
     assert(CodeGenOpts.RelocationModel == "dynamic-no-pic" &&
            "Invalid PIC model!");
     TargetMachine::setRelocationModel(llvm::Reloc::DynamicNoPIC);
   }
   // FIXME: Parse this earlier.
   if (CodeGenOpts.CodeModel == "small") {
     TargetMachine::setCodeModel(llvm::CodeModel::Small);
   } else if (CodeGenOpts.CodeModel == "kernel") {
     TargetMachine::setCodeModel(llvm::CodeModel::Kernel);
   } else if (CodeGenOpts.CodeModel == "medium") {
     TargetMachine::setCodeModel(llvm::CodeModel::Medium);
   } else if (CodeGenOpts.CodeModel == "large") {
     TargetMachine::setCodeModel(llvm::CodeModel::Large);
   } else {
     assert(CodeGenOpts.CodeModel.empty() && "Invalid code model!");
     TargetMachine::setCodeModel(llvm::CodeModel::Default);
   }

   std::vector<const char *> BackendArgs;
   BackendArgs.push_back("clang"); // Fake program name.
   if (!CodeGenOpts.DebugPass.empty()) {
     BackendArgs.push_back("-debug-pass");
     BackendArgs.push_back(CodeGenOpts.DebugPass.c_str());
   }
   if (!CodeGenOpts.LimitFloatPrecision.empty()) {
     BackendArgs.push_back("-limit-float-precision");
     BackendArgs.push_back(CodeGenOpts.LimitFloatPrecision.c_str());
   }
   if (llvm::TimePassesIsEnabled)
     BackendArgs.push_back("-time-passes");
   BackendArgs.push_back(0);
   llvm::cl::ParseCommandLineOptions(BackendArgs.size() - 1,
                                     const_cast<char **>(&BackendArgs[0]));

   std::string FeaturesStr;
   if (TargetOpts.CPU.size() || TargetOpts.Features.size()) {
     SubtargetFeatures Features;
     Features.setCPU(TargetOpts.CPU);
     for (std::vector<std::string>::const_iterator
            it = TargetOpts.Features.begin(),
            ie = TargetOpts.Features.end(); it != ie; ++it)
       Features.AddFeature(*it);
     FeaturesStr = Features.getString();
   }
   TargetMachine *TM = TheTarget->createTargetMachine(Triple, FeaturesStr);

   if (CodeGenOpts.RelaxAll)
     TM->setMCRelaxAll(true);

   // Create the code generator passes.
   FunctionPassManager *PM = getCodeGenPasses();
   CodeGenOpt::Level OptLevel = CodeGenOpt::Default;

   switch (CodeGenOpts.OptimizationLevel) {
   default: break;
   case 0: OptLevel = CodeGenOpt::None; break;
   case 3: OptLevel = CodeGenOpt::Aggressive; break;
   }

   // Normal mode, emit a .s or .o file by running the code generator. Note,
   // this also adds codegenerator level optimization passes.
   TargetMachine::CodeGenFileType CGFT = TargetMachine::CGFT_AssemblyFile;
   if (Action == Backend_EmitObj)
     CGFT = TargetMachine::CGFT_ObjectFile;
   else if (Action == Backend_EmitMCNull)
     CGFT = TargetMachine::CGFT_Null;
   else
     assert(Action == Backend_EmitAssembly && "Invalid action!");
   if (TM->addPassesToEmitFile(*PM, OS, CGFT, OptLevel,
                               /*DisableVerify=*/!CodeGenOpts.VerifyModule)) {
     Diags.Report(diag::err_fe_unable_to_interface_with_target);
     return false;
   }

   return true;
 }

 void EmitAssemblyHelper::EmitAssembly(BackendAction Action, raw_ostream *OS) {
   TimeRegion Region(llvm::TimePassesIsEnabled ? &CodeGenerationTime : 0);
   llvm::formatted_raw_ostream FormattedOS;

   CreatePasses();
   switch (Action) {
   case Backend_EmitNothing:
     break;

   case Backend_EmitBC:
     getPerModulePasses()->add(createBitcodeWriterPass(*OS));
     break;

   case Backend_EmitLL:
     FormattedOS.setStream(*OS, formatted_raw_ostream::PRESERVE_STREAM);
     getPerModulePasses()->add(createPrintModulePass(&FormattedOS));
     break;

   default:
     FormattedOS.setStream(*OS, formatted_raw_ostream::PRESERVE_STREAM);
     if (!AddEmitPasses(Action, FormattedOS))
       return;
   }

   // Run passes. For now we do all passes at once, but eventually we
   // would like to have the option of streaming code generation.

   if (PerFunctionPasses) {
     PrettyStackTraceString CrashInfo("Per-function optimization");

     PerFunctionPasses->doInitialization();
     for (Module::iterator I = TheModule->begin(),
            E = TheModule->end(); I != E; ++I)
       if (!I->isDeclaration())
         PerFunctionPasses->run(*I);
     PerFunctionPasses->doFinalization();
   }

   if (PerModulePasses) {
     PrettyStackTraceString CrashInfo("Per-module optimization passes");
     PerModulePasses->run(*TheModule);
   }

   if (CodeGenPasses) {
     PrettyStackTraceString CrashInfo("Code generation");

     CodeGenPasses->doInitialization();
     for (Module::iterator I = TheModule->begin(),
            E = TheModule->end(); I != E; ++I)
       if (!I->isDeclaration())
         CodeGenPasses->run(*I);
     CodeGenPasses->doFinalization();
   }
 }

 void clang::EmitBackendOutput(Diagnostic &Diags, const CodeGenOptions &CGOpts,
                               const TargetOptions &TOpts, Module *M,
                               BackendAction Action, raw_ostream *OS) {
   EmitAssemblyHelper AsmHelper(Diags, CGOpts, TOpts, M);

   AsmHelper.EmitAssembly(Action, OS);
 }
	//===--- BackendUtil.cpp - LLVM Backend Utilities -------------------------===//
	//
	// The LLVM Compiler Infrastructure
	//
	// This file is distributed under the University of Illinois Open Source
	// License. See LICENSE.TXT for details.
	//
	//===----------------------------------------------------------------------===//

	#include "clang/CodeGen/BackendUtil.h"
	#include "clang/Basic/Diagnostic.h"
	#include "clang/Basic/TargetOptions.h"
	#include "clang/Frontend/CodeGenOptions.h"
	#include "clang/Frontend/FrontendDiagnostic.h"
	#include "llvm/Module.h"
	#include "llvm/PassManager.h"
	#include "llvm/Assembly/PrintModulePass.h"
	#include "llvm/Bitcode/ReaderWriter.h"
	#include "llvm/CodeGen/RegAllocRegistry.h"
	#include "llvm/CodeGen/SchedulerRegistry.h"
	#include "llvm/Support/CommandLine.h"
	#include "llvm/Support/FormattedStream.h"
	#include "llvm/Support/PrettyStackTrace.h"
	#include "llvm/Support/StandardPasses.h"
	#include "llvm/Support/Timer.h"
	#include "llvm/Support/raw_ostream.h"
	#include "llvm/Target/SubtargetFeature.h"
	#include "llvm/Target/TargetData.h"
	#include "llvm/Target/TargetMachine.h"
	#include "llvm/Target/TargetOptions.h"
	#include "llvm/Target/TargetRegistry.h"
	using namespace clang;
	using namespace llvm;

	namespace {

	class EmitAssemblyHelper {
	Diagnostic &Diags;
	const CodeGenOptions &CodeGenOpts;
	const TargetOptions &TargetOpts;
	Module *TheModule;

	Timer CodeGenerationTime;

	mutable FunctionPassManager *CodeGenPasses;
	mutable PassManager *PerModulePasses;
	mutable FunctionPassManager *PerFunctionPasses;

	private:
	FunctionPassManager *getCodeGenPasses() const {
	if (!CodeGenPasses) {
	CodeGenPasses = new FunctionPassManager(TheModule);
	CodeGenPasses->add(new TargetData(TheModule));
	}
	return CodeGenPasses;
	}

	PassManager *getPerModulePasses() const {
	if (!PerModulePasses) {
	PerModulePasses = new PassManager();
	PerModulePasses->add(new TargetData(TheModule));
	}
	return PerModulePasses;
	}

	FunctionPassManager *getPerFunctionPasses() const {
	if (!PerFunctionPasses) {
	PerFunctionPasses = new FunctionPassManager(TheModule);
	PerFunctionPasses->add(new TargetData(TheModule));
	}
	return PerFunctionPasses;
	}

	void CreatePasses();

	/// AddEmitPasses - Add passes necessary to emit assembly or LLVM IR.
	///
	/// \return True on success.
	bool AddEmitPasses(BackendAction Action, formatted_raw_ostream &OS);

	public:
	EmitAssemblyHelper(Diagnostic &_Diags,
	const CodeGenOptions &CGOpts, const TargetOptions &TOpts,
	Module *M)
	: Diags(_Diags), CodeGenOpts(CGOpts), TargetOpts(TOpts),
	TheModule(M), CodeGenerationTime("Code Generation Time"),
	CodeGenPasses(0), PerModulePasses(0), PerFunctionPasses(0) {}

	~EmitAssemblyHelper() {
	delete CodeGenPasses;
	delete PerModulePasses;
	delete PerFunctionPasses;
	}

	void EmitAssembly(BackendAction Action, raw_ostream *OS);
	};

	}

	void EmitAssemblyHelper::CreatePasses() {
	unsigned OptLevel = CodeGenOpts.OptimizationLevel;
	CodeGenOptions::InliningMethod Inlining = CodeGenOpts.Inlining;

	// Handle disabling of LLVM optimization, where we want to preserve the
	// internal module before any optimization.
	if (CodeGenOpts.DisableLLVMOpts) {
	OptLevel = 0;
	Inlining = CodeGenOpts.NoInlining;
	}

	// In -O0 if checking is disabled, we don't even have per-function passes.
	if (CodeGenOpts.VerifyModule)
	getPerFunctionPasses()->add(createVerifierPass());

	// Assume that standard function passes aren't run for -O0.
	if (OptLevel > 0)
	llvm::createStandardFunctionPasses(getPerFunctionPasses(), OptLevel);

	llvm::Pass *InliningPass = 0;
	switch (Inlining) {
	case CodeGenOptions::NoInlining: break;
	case CodeGenOptions::NormalInlining: {
	// Set the inline threshold following llvm-gcc.
	//
	// FIXME: Derive these constants in a principled fashion.
	unsigned Threshold = 225;
	if (CodeGenOpts.OptimizeSize)
	Threshold = 75;
	else if (OptLevel > 2)
	Threshold = 275;
	InliningPass = createFunctionInliningPass(Threshold);
	break;
	}
	case CodeGenOptions::OnlyAlwaysInlining:
	InliningPass = createAlwaysInlinerPass(); // Respect always_inline
	break;
	}

	// For now we always create per module passes.
	llvm::createStandardModulePasses(getPerModulePasses(), OptLevel,
	CodeGenOpts.OptimizeSize,
	CodeGenOpts.UnitAtATime,
	CodeGenOpts.UnrollLoops,
	CodeGenOpts.SimplifyLibCalls,
	/HaveExceptions=/true,
	InliningPass);
	}

	bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
	formatted_raw_ostream &OS) {
	// Create the TargetMachine for generating code.
	std::string Error;
	std::string Triple = TheModule->getTargetTriple();
	const llvm::Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
	if (!TheTarget) {
	Diags.Report(diag::err_fe_unable_to_create_target) << Error;
	return false;
	}

	// FIXME: Expose these capabilities via actual APIs!!!! Aside from just
	// being gross, this is also totally broken if we ever care about
	// concurrency.
	llvm::NoFramePointerElim = CodeGenOpts.DisableFPElim;
	if (CodeGenOpts.FloatABI == "soft")
	llvm::FloatABIType = llvm::FloatABI::Soft;
	else if (CodeGenOpts.FloatABI == "hard")
	llvm::FloatABIType = llvm::FloatABI::Hard;
	else {
	assert(CodeGenOpts.FloatABI.empty() && "Invalid float abi!");
	llvm::FloatABIType = llvm::FloatABI::Default;
	}
	NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;
	llvm::UseSoftFloat = CodeGenOpts.SoftFloat;
	UnwindTablesMandatory = CodeGenOpts.UnwindTables;

	TargetMachine::setAsmVerbosityDefault(CodeGenOpts.AsmVerbose);

	TargetMachine::setFunctionSections(CodeGenOpts.FunctionSections);
	TargetMachine::setDataSections (CodeGenOpts.DataSections);

	// FIXME: Parse this earlier.
	if (CodeGenOpts.RelocationModel == "static") {
	TargetMachine::setRelocationModel(llvm::Reloc::Static);
	} else if (CodeGenOpts.RelocationModel == "pic") {
	TargetMachine::setRelocationModel(llvm::Reloc::PIC_);
	} else {
	assert(CodeGenOpts.RelocationModel == "dynamic-no-pic" &&
	"Invalid PIC model!");
	TargetMachine::setRelocationModel(llvm::Reloc::DynamicNoPIC);
	}
	// FIXME: Parse this earlier.
	if (CodeGenOpts.CodeModel == "small") {
	TargetMachine::setCodeModel(llvm::CodeModel::Small);
	} else if (CodeGenOpts.CodeModel == "kernel") {
	TargetMachine::setCodeModel(llvm::CodeModel::Kernel);
	} else if (CodeGenOpts.CodeModel == "medium") {
	TargetMachine::setCodeModel(llvm::CodeModel::Medium);
	} else if (CodeGenOpts.CodeModel == "large") {
	TargetMachine::setCodeModel(llvm::CodeModel::Large);
	} else {
	assert(CodeGenOpts.CodeModel.empty() && "Invalid code model!");
	TargetMachine::setCodeModel(llvm::CodeModel::Default);
	}

	std::vector<const char *> BackendArgs;
	BackendArgs.push_back("clang"); // Fake program name.
	if (!CodeGenOpts.DebugPass.empty()) {
	BackendArgs.push_back("-debug-pass");
	BackendArgs.push_back(CodeGenOpts.DebugPass.c_str());
	}
	if (!CodeGenOpts.LimitFloatPrecision.empty()) {
	BackendArgs.push_back("-limit-float-precision");
	BackendArgs.push_back(CodeGenOpts.LimitFloatPrecision.c_str());
	}
	if (llvm::TimePassesIsEnabled)
	BackendArgs.push_back("-time-passes");
	BackendArgs.push_back(0);
	llvm::cl::ParseCommandLineOptions(BackendArgs.size() - 1,
	const_cast<char **>(&BackendArgs[0]));

	std::string FeaturesStr;
	if (TargetOpts.CPU.size() \|\| TargetOpts.Features.size()) {
	SubtargetFeatures Features;
	Features.setCPU(TargetOpts.CPU);
	for (std::vector<std::string>::const_iterator
	it = TargetOpts.Features.begin(),
	ie = TargetOpts.Features.end(); it != ie; ++it)
	Features.AddFeature(*it);
	FeaturesStr = Features.getString();
	}
	TargetMachine *TM = TheTarget->createTargetMachine(Triple, FeaturesStr);

	if (CodeGenOpts.RelaxAll)
	TM->setMCRelaxAll(true);

	// Create the code generator passes.
	FunctionPassManager *PM = getCodeGenPasses();
	CodeGenOpt::Level OptLevel = CodeGenOpt::Default;

	switch (CodeGenOpts.OptimizationLevel) {
	default: break;
	case 0: OptLevel = CodeGenOpt::None; break;
	case 3: OptLevel = CodeGenOpt::Aggressive; break;
	}

	// Normal mode, emit a .s or .o file by running the code generator. Note,
	// this also adds codegenerator level optimization passes.
	TargetMachine::CodeGenFileType CGFT = TargetMachine::CGFT_AssemblyFile;
	if (Action == Backend_EmitObj)
	CGFT = TargetMachine::CGFT_ObjectFile;
	else if (Action == Backend_EmitMCNull)
	CGFT = TargetMachine::CGFT_Null;
	else
	assert(Action == Backend_EmitAssembly && "Invalid action!");
	if (TM->addPassesToEmitFile(*PM, OS, CGFT, OptLevel,
	/DisableVerify=/!CodeGenOpts.VerifyModule)) {
	Diags.Report(diag::err_fe_unable_to_interface_with_target);
	return false;
	}

	return true;
	}

	void EmitAssemblyHelper::EmitAssembly(BackendAction Action, raw_ostream *OS) {
	TimeRegion Region(llvm::TimePassesIsEnabled ? &CodeGenerationTime : 0);
	llvm::formatted_raw_ostream FormattedOS;

	CreatePasses();
	switch (Action) {
	case Backend_EmitNothing:
	break;

	case Backend_EmitBC:
	getPerModulePasses()->add(createBitcodeWriterPass(*OS));
	break;

	case Backend_EmitLL:
	FormattedOS.setStream(*OS, formatted_raw_ostream::PRESERVE_STREAM);
	getPerModulePasses()->add(createPrintModulePass(&FormattedOS));
	break;

	default:
	FormattedOS.setStream(*OS, formatted_raw_ostream::PRESERVE_STREAM);
	if (!AddEmitPasses(Action, FormattedOS))
	return;
	}

	// Run passes. For now we do all passes at once, but eventually we
	// would like to have the option of streaming code generation.

	if (PerFunctionPasses) {
	PrettyStackTraceString CrashInfo("Per-function optimization");

	PerFunctionPasses->doInitialization();
	for (Module::iterator I = TheModule->begin(),
	E = TheModule->end(); I != E; ++I)
	if (!I->isDeclaration())
	PerFunctionPasses->run(*I);
	PerFunctionPasses->doFinalization();
	}

	if (PerModulePasses) {
	PrettyStackTraceString CrashInfo("Per-module optimization passes");
	PerModulePasses->run(*TheModule);
	}

	if (CodeGenPasses) {
	PrettyStackTraceString CrashInfo("Code generation");

	CodeGenPasses->doInitialization();
	for (Module::iterator I = TheModule->begin(),
	E = TheModule->end(); I != E; ++I)
	if (!I->isDeclaration())
	CodeGenPasses->run(*I);
	CodeGenPasses->doFinalization();
	}
	}

	void clang::EmitBackendOutput(Diagnostic &Diags, const CodeGenOptions &CGOpts,
	const TargetOptions &TOpts, Module *M,
	BackendAction Action, raw_ostream *OS) {
	EmitAssemblyHelper AsmHelper(Diags, CGOpts, TOpts, M);

	AsmHelper.EmitAssembly(Action, OS);
	}