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-rw-r--r--lib/Frontend/BackendUtil.cpp325
1 files changed, 0 insertions, 325 deletions
diff --git a/lib/Frontend/BackendUtil.cpp b/lib/Frontend/BackendUtil.cpp
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-//===--- 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/Frontend/BackendUtil.h"
-#include "clang/Basic/Diagnostic.h"
-#include "clang/Basic/TargetOptions.h"
-#include "clang/CodeGen/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);
-}
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