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-rw-r--r--lib/Frontend/CodeGenAction.cpp593
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diff --git a/lib/Frontend/CodeGenAction.cpp b/lib/Frontend/CodeGenAction.cpp
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-//===--- CodeGenAction.cpp - LLVM Code Generation Frontend Action ---------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "clang/Frontend/CodeGenAction.h"
-#include "clang/Basic/SourceManager.h"
-#include "clang/Basic/TargetInfo.h"
-#include "clang/Basic/TargetOptions.h"
-#include "clang/AST/ASTConsumer.h"
-#include "clang/AST/ASTContext.h"
-#include "clang/AST/DeclGroup.h"
-#include "clang/CodeGen/CodeGenOptions.h"
-#include "clang/CodeGen/ModuleBuilder.h"
-#include "clang/Frontend/ASTConsumers.h"
-#include "clang/Frontend/CompilerInstance.h"
-#include "clang/Frontend/FrontendDiagnostic.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
-#include "llvm/PassManager.h"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/Assembly/PrintModulePass.h"
-#include "llvm/Analysis/CallGraph.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/CodeGen/RegAllocRegistry.h"
-#include "llvm/CodeGen/SchedulerRegistry.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/SourceMgr.h"
-#include "llvm/Support/StandardPasses.h"
-#include "llvm/Support/Timer.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 {
- enum BackendAction {
- Backend_EmitAssembly, ///< Emit native assembly files
- Backend_EmitBC, ///< Emit LLVM bitcode files
- Backend_EmitLL, ///< Emit human-readable LLVM assembly
- Backend_EmitNothing, ///< Don't emit anything (benchmarking mode)
- Backend_EmitMCNull, ///< Run CodeGen, but don't emit anything
- Backend_EmitObj ///< Emit native object files
- };
-
- class BackendConsumer : public ASTConsumer {
- Diagnostic &Diags;
- BackendAction Action;
- const CodeGenOptions &CodeGenOpts;
- const LangOptions &LangOpts;
- const TargetOptions &TargetOpts;
- llvm::raw_ostream *AsmOutStream;
- llvm::formatted_raw_ostream FormattedOutStream;
- ASTContext *Context;
-
- Timer LLVMIRGeneration;
- Timer CodeGenerationTime;
-
- llvm::OwningPtr<CodeGenerator> Gen;
-
- llvm::OwningPtr<llvm::Module> TheModule;
- llvm::TargetData *TheTargetData;
-
- mutable FunctionPassManager *CodeGenPasses;
- mutable PassManager *PerModulePasses;
- mutable FunctionPassManager *PerFunctionPasses;
-
- FunctionPassManager *getCodeGenPasses() const;
- PassManager *getPerModulePasses() const;
- FunctionPassManager *getPerFunctionPasses() const;
-
- void CreatePasses();
-
- /// AddEmitPasses - Add passes necessary to emit assembly or LLVM IR.
- ///
- /// \return True on success.
- bool AddEmitPasses();
-
- void EmitAssembly();
-
- public:
- BackendConsumer(BackendAction action, Diagnostic &_Diags,
- const LangOptions &langopts, const CodeGenOptions &compopts,
- const TargetOptions &targetopts, bool TimePasses,
- const std::string &infile, llvm::raw_ostream *OS,
- LLVMContext &C) :
- Diags(_Diags),
- Action(action),
- CodeGenOpts(compopts),
- LangOpts(langopts),
- TargetOpts(targetopts),
- AsmOutStream(OS),
- LLVMIRGeneration("LLVM IR Generation Time"),
- CodeGenerationTime("Code Generation Time"),
- Gen(CreateLLVMCodeGen(Diags, infile, compopts, C)),
- TheTargetData(0),
- CodeGenPasses(0), PerModulePasses(0), PerFunctionPasses(0) {
-
- if (AsmOutStream)
- FormattedOutStream.setStream(*AsmOutStream,
- formatted_raw_ostream::PRESERVE_STREAM);
-
- llvm::TimePassesIsEnabled = TimePasses;
- }
-
- ~BackendConsumer() {
- delete TheTargetData;
- delete CodeGenPasses;
- delete PerModulePasses;
- delete PerFunctionPasses;
- }
-
- llvm::Module *takeModule() { return TheModule.take(); }
-
- virtual void Initialize(ASTContext &Ctx) {
- Context = &Ctx;
-
- if (llvm::TimePassesIsEnabled)
- LLVMIRGeneration.startTimer();
-
- Gen->Initialize(Ctx);
-
- TheModule.reset(Gen->GetModule());
- TheTargetData = new llvm::TargetData(Ctx.Target.getTargetDescription());
-
- if (llvm::TimePassesIsEnabled)
- LLVMIRGeneration.stopTimer();
- }
-
- virtual void HandleTopLevelDecl(DeclGroupRef D) {
- PrettyStackTraceDecl CrashInfo(*D.begin(), SourceLocation(),
- Context->getSourceManager(),
- "LLVM IR generation of declaration");
-
- if (llvm::TimePassesIsEnabled)
- LLVMIRGeneration.startTimer();
-
- Gen->HandleTopLevelDecl(D);
-
- if (llvm::TimePassesIsEnabled)
- LLVMIRGeneration.stopTimer();
- }
-
- virtual void HandleTranslationUnit(ASTContext &C) {
- {
- PrettyStackTraceString CrashInfo("Per-file LLVM IR generation");
- if (llvm::TimePassesIsEnabled)
- LLVMIRGeneration.startTimer();
-
- Gen->HandleTranslationUnit(C);
-
- if (llvm::TimePassesIsEnabled)
- LLVMIRGeneration.stopTimer();
- }
-
- // EmitAssembly times and registers crash info itself.
- EmitAssembly();
-
- // Force a flush here in case we never get released.
- if (AsmOutStream)
- FormattedOutStream.flush();
- }
-
- virtual void HandleTagDeclDefinition(TagDecl *D) {
- PrettyStackTraceDecl CrashInfo(D, SourceLocation(),
- Context->getSourceManager(),
- "LLVM IR generation of declaration");
- Gen->HandleTagDeclDefinition(D);
- }
-
- virtual void CompleteTentativeDefinition(VarDecl *D) {
- Gen->CompleteTentativeDefinition(D);
- }
-
- virtual void HandleVTable(CXXRecordDecl *RD, bool DefinitionRequired) {
- Gen->HandleVTable(RD, DefinitionRequired);
- }
-
- static void InlineAsmDiagHandler(const llvm::SMDiagnostic &SM,void *Context,
- unsigned LocCookie) {
- SourceLocation Loc = SourceLocation::getFromRawEncoding(LocCookie);
- ((BackendConsumer*)Context)->InlineAsmDiagHandler2(SM, Loc);
- }
-
- void InlineAsmDiagHandler2(const llvm::SMDiagnostic &,
- SourceLocation LocCookie);
- };
-}
-
-FunctionPassManager *BackendConsumer::getCodeGenPasses() const {
- if (!CodeGenPasses) {
- CodeGenPasses = new FunctionPassManager(&*TheModule);
- CodeGenPasses->add(new TargetData(*TheTargetData));
- }
-
- return CodeGenPasses;
-}
-
-PassManager *BackendConsumer::getPerModulePasses() const {
- if (!PerModulePasses) {
- PerModulePasses = new PassManager();
- PerModulePasses->add(new TargetData(*TheTargetData));
- }
-
- return PerModulePasses;
-}
-
-FunctionPassManager *BackendConsumer::getPerFunctionPasses() const {
- if (!PerFunctionPasses) {
- PerFunctionPasses = new FunctionPassManager(&*TheModule);
- PerFunctionPasses->add(new TargetData(*TheTargetData));
- }
-
- return PerFunctionPasses;
-}
-
-bool BackendConsumer::AddEmitPasses() {
- if (Action == Backend_EmitNothing)
- return true;
-
- if (Action == Backend_EmitBC) {
- getPerModulePasses()->add(createBitcodeWriterPass(FormattedOutStream));
- return true;
- }
-
- if (Action == Backend_EmitLL) {
- getPerModulePasses()->add(createPrintModulePass(&FormattedOutStream));
- return true;
- }
-
- bool Fast = CodeGenOpts.OptimizationLevel == 0;
-
- // 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);
-
- // Set register scheduler & allocation policy.
- RegisterScheduler::setDefault(createDefaultScheduler);
- RegisterRegAlloc::setDefault(Fast ? createLocalRegisterAllocator :
- createLinearScanRegisterAllocator);
-
- // 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, FormattedOutStream, CGFT, OptLevel,
- /*DisableVerify=*/!CodeGenOpts.VerifyModule)) {
- Diags.Report(diag::err_fe_unable_to_interface_with_target);
- return false;
- }
-
- return true;
-}
-
-void BackendConsumer::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.
- PassManager *PM = getPerModulePasses();
- llvm::createStandardModulePasses(PM, OptLevel, CodeGenOpts.OptimizeSize,
- CodeGenOpts.UnitAtATime,
- CodeGenOpts.UnrollLoops,
- /*SimplifyLibCalls=*/!LangOpts.NoBuiltin,
- /*HaveExceptions=*/true,
- InliningPass);
-}
-
-/// EmitAssembly - Handle interaction with LLVM backend to generate
-/// actual machine code.
-void BackendConsumer::EmitAssembly() {
- // Silently ignore if we weren't initialized for some reason.
- if (!TheModule || !TheTargetData)
- return;
-
- TimeRegion Region(llvm::TimePassesIsEnabled ? &CodeGenerationTime : 0);
-
- // Make sure IR generation is happy with the module. This is
- // released by the module provider.
- Module *M = Gen->ReleaseModule();
- if (!M) {
- // The module has been released by IR gen on failures, do not
- // double free.
- TheModule.take();
- return;
- }
-
- assert(TheModule.get() == M &&
- "Unexpected module change during IR generation");
-
- CreatePasses();
- if (!AddEmitPasses())
- 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 = M->begin(), E = M->end(); I != E; ++I)
- if (!I->isDeclaration())
- PerFunctionPasses->run(*I);
- PerFunctionPasses->doFinalization();
- }
-
- if (PerModulePasses) {
- PrettyStackTraceString CrashInfo("Per-module optimization passes");
- PerModulePasses->run(*M);
- }
-
- if (CodeGenPasses) {
- PrettyStackTraceString CrashInfo("Code generation");
-
- // Install an inline asm handler so that diagnostics get printed through our
- // diagnostics hooks.
- LLVMContext &Ctx = TheModule->getContext();
- void *OldHandler = Ctx.getInlineAsmDiagnosticHandler();
- void *OldContext = Ctx.getInlineAsmDiagnosticContext();
- Ctx.setInlineAsmDiagnosticHandler((void*)(intptr_t)InlineAsmDiagHandler,
- this);
-
- CodeGenPasses->doInitialization();
- for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
- if (!I->isDeclaration())
- CodeGenPasses->run(*I);
- CodeGenPasses->doFinalization();
-
- Ctx.setInlineAsmDiagnosticHandler(OldHandler, OldContext);
- }
-}
-
-/// ConvertBackendLocation - Convert a location in a temporary llvm::SourceMgr
-/// buffer to be a valid FullSourceLoc.
-static FullSourceLoc ConvertBackendLocation(const llvm::SMDiagnostic &D,
- SourceManager &CSM) {
- // Get both the clang and llvm source managers. The location is relative to
- // a memory buffer that the LLVM Source Manager is handling, we need to add
- // a copy to the Clang source manager.
- const llvm::SourceMgr &LSM = *D.getSourceMgr();
-
- // We need to copy the underlying LLVM memory buffer because llvm::SourceMgr
- // already owns its one and clang::SourceManager wants to own its one.
- const MemoryBuffer *LBuf =
- LSM.getMemoryBuffer(LSM.FindBufferContainingLoc(D.getLoc()));
-
- // Create the copy and transfer ownership to clang::SourceManager.
- llvm::MemoryBuffer *CBuf =
- llvm::MemoryBuffer::getMemBufferCopy(LBuf->getBuffer(),
- LBuf->getBufferIdentifier());
- FileID FID = CSM.createFileIDForMemBuffer(CBuf);
-
- // Translate the offset into the file.
- unsigned Offset = D.getLoc().getPointer() - LBuf->getBufferStart();
- SourceLocation NewLoc =
- CSM.getLocForStartOfFile(FID).getFileLocWithOffset(Offset);
- return FullSourceLoc(NewLoc, CSM);
-}
-
-
-/// InlineAsmDiagHandler2 - This function is invoked when the backend hits an
-/// error parsing inline asm. The SMDiagnostic indicates the error relative to
-/// the temporary memory buffer that the inline asm parser has set up.
-void BackendConsumer::InlineAsmDiagHandler2(const llvm::SMDiagnostic &D,
- SourceLocation LocCookie) {
- // There are a couple of different kinds of errors we could get here. First,
- // we re-format the SMDiagnostic in terms of a clang diagnostic.
-
- // Strip "error: " off the start of the message string.
- llvm::StringRef Message = D.getMessage();
- if (Message.startswith("error: "))
- Message = Message.substr(7);
-
- // There are two cases: the SMDiagnostic could have a inline asm source
- // location or it might not. If it does, translate the location.
- FullSourceLoc Loc;
- if (D.getLoc() != SMLoc())
- Loc = ConvertBackendLocation(D, Context->getSourceManager());
- Diags.Report(Loc, diag::err_fe_inline_asm).AddString(Message);
-
- // This could be a problem with no clang-level source location information.
- // In this case, LocCookie is invalid. If there is source level information,
- // print an "generated from" note.
- if (LocCookie.isValid())
- Diags.Report(FullSourceLoc(LocCookie, Context->getSourceManager()),
- diag::note_fe_inline_asm_here);
-}
-
-//
-
-CodeGenAction::CodeGenAction(unsigned _Act) : Act(_Act) {}
-
-CodeGenAction::~CodeGenAction() {}
-
-void CodeGenAction::EndSourceFileAction() {
- // If the consumer creation failed, do nothing.
- if (!getCompilerInstance().hasASTConsumer())
- return;
-
- // Steal the module from the consumer.
- BackendConsumer *Consumer = static_cast<BackendConsumer*>(
- &getCompilerInstance().getASTConsumer());
-
- TheModule.reset(Consumer->takeModule());
-}
-
-llvm::Module *CodeGenAction::takeModule() {
- return TheModule.take();
-}
-
-ASTConsumer *CodeGenAction::CreateASTConsumer(CompilerInstance &CI,
- llvm::StringRef InFile) {
- BackendAction BA = static_cast<BackendAction>(Act);
- llvm::OwningPtr<llvm::raw_ostream> OS;
- switch (BA) {
- case Backend_EmitAssembly:
- OS.reset(CI.createDefaultOutputFile(false, InFile, "s"));
- break;
- case Backend_EmitLL:
- OS.reset(CI.createDefaultOutputFile(false, InFile, "ll"));
- break;
- case Backend_EmitBC:
- OS.reset(CI.createDefaultOutputFile(true, InFile, "bc"));
- break;
- case Backend_EmitNothing:
- break;
- case Backend_EmitMCNull:
- case Backend_EmitObj:
- OS.reset(CI.createDefaultOutputFile(true, InFile, "o"));
- break;
- }
- if (BA != Backend_EmitNothing && !OS)
- return 0;
-
- return new BackendConsumer(BA, CI.getDiagnostics(), CI.getLangOpts(),
- CI.getCodeGenOpts(), CI.getTargetOpts(),
- CI.getFrontendOpts().ShowTimers, InFile, OS.take(),
- CI.getLLVMContext());
-}
-
-EmitAssemblyAction::EmitAssemblyAction()
- : CodeGenAction(Backend_EmitAssembly) {}
-
-EmitBCAction::EmitBCAction() : CodeGenAction(Backend_EmitBC) {}
-
-EmitLLVMAction::EmitLLVMAction() : CodeGenAction(Backend_EmitLL) {}
-
-EmitLLVMOnlyAction::EmitLLVMOnlyAction() : CodeGenAction(Backend_EmitNothing) {}
-
-EmitCodeGenOnlyAction::EmitCodeGenOnlyAction() : CodeGenAction(Backend_EmitMCNull) {}
-
-EmitObjAction::EmitObjAction() : CodeGenAction(Backend_EmitObj) {}
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