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911 lines
34 KiB
911 lines
34 KiB
//===--- BackendUtil.cpp - LLVM Backend Utilities -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/CodeGen/BackendUtil.h"
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/LangOptions.h"
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#include "clang/Basic/TargetOptions.h"
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#include "clang/Frontend/CodeGenOptions.h"
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#include "clang/Frontend/FrontendDiagnostic.h"
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#include "clang/Frontend/Utils.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Analysis/TargetLibraryInfo.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Bitcode/BitcodeWriterPass.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/CodeGen/RegAllocRegistry.h"
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#include "llvm/CodeGen/SchedulerRegistry.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/IR/ModuleSummaryIndex.h"
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#include "llvm/IR/IRPrintingPasses.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/Verifier.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/Object/ModuleSummaryIndexObjectFile.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/Timer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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#include "llvm/Transforms/Instrumentation.h"
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#include "llvm/Transforms/ObjCARC.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Scalar/GVN.h"
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#include "llvm/Transforms/Utils/SymbolRewriter.h"
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#include <memory>
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using namespace clang;
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using namespace llvm;
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namespace {
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class EmitAssemblyHelper {
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DiagnosticsEngine &Diags;
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const CodeGenOptions &CodeGenOpts;
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const clang::TargetOptions &TargetOpts;
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const LangOptions &LangOpts;
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Module *TheModule;
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Timer CodeGenerationTime;
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mutable legacy::PassManager *CodeGenPasses;
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mutable legacy::PassManager *PerModulePasses;
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mutable legacy::FunctionPassManager *PerFunctionPasses;
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private:
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TargetIRAnalysis getTargetIRAnalysis() const {
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if (TM)
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return TM->getTargetIRAnalysis();
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return TargetIRAnalysis();
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}
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legacy::PassManager *getCodeGenPasses() const {
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if (!CodeGenPasses) {
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CodeGenPasses = new legacy::PassManager();
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CodeGenPasses->add(
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createTargetTransformInfoWrapperPass(getTargetIRAnalysis()));
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}
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return CodeGenPasses;
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}
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legacy::PassManager *getPerModulePasses() const {
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if (!PerModulePasses) {
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PerModulePasses = new legacy::PassManager();
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PerModulePasses->add(
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createTargetTransformInfoWrapperPass(getTargetIRAnalysis()));
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}
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return PerModulePasses;
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}
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legacy::FunctionPassManager *getPerFunctionPasses() const {
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if (!PerFunctionPasses) {
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PerFunctionPasses = new legacy::FunctionPassManager(TheModule);
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PerFunctionPasses->add(
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createTargetTransformInfoWrapperPass(getTargetIRAnalysis()));
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}
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return PerFunctionPasses;
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}
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/// Set LLVM command line options passed through -backend-option.
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void setCommandLineOpts();
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void CreatePasses(ModuleSummaryIndex *ModuleSummary);
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/// Generates the TargetMachine.
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/// Returns Null if it is unable to create the target machine.
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/// Some of our clang tests specify triples which are not built
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/// into clang. This is okay because these tests check the generated
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/// IR, and they require DataLayout which depends on the triple.
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/// In this case, we allow this method to fail and not report an error.
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/// When MustCreateTM is used, we print an error if we are unable to load
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/// the requested target.
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TargetMachine *CreateTargetMachine(bool MustCreateTM);
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/// Add passes necessary to emit assembly or LLVM IR.
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///
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/// \return True on success.
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bool AddEmitPasses(BackendAction Action, raw_pwrite_stream &OS);
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public:
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EmitAssemblyHelper(DiagnosticsEngine &_Diags, const CodeGenOptions &CGOpts,
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const clang::TargetOptions &TOpts,
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const LangOptions &LOpts, Module *M)
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: Diags(_Diags), CodeGenOpts(CGOpts), TargetOpts(TOpts), LangOpts(LOpts),
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TheModule(M), CodeGenerationTime("Code Generation Time"),
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CodeGenPasses(nullptr), PerModulePasses(nullptr),
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PerFunctionPasses(nullptr) {}
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~EmitAssemblyHelper() {
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delete CodeGenPasses;
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delete PerModulePasses;
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delete PerFunctionPasses;
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if (CodeGenOpts.DisableFree)
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BuryPointer(std::move(TM));
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}
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std::unique_ptr<TargetMachine> TM;
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void EmitAssembly(BackendAction Action, raw_pwrite_stream *OS);
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};
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// We need this wrapper to access LangOpts and CGOpts from extension functions
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// that we add to the PassManagerBuilder.
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class PassManagerBuilderWrapper : public PassManagerBuilder {
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public:
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PassManagerBuilderWrapper(const CodeGenOptions &CGOpts,
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const LangOptions &LangOpts)
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: PassManagerBuilder(), CGOpts(CGOpts), LangOpts(LangOpts) {}
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const CodeGenOptions &getCGOpts() const { return CGOpts; }
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const LangOptions &getLangOpts() const { return LangOpts; }
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private:
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const CodeGenOptions &CGOpts;
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const LangOptions &LangOpts;
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};
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}
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static void addObjCARCAPElimPass(const PassManagerBuilder &Builder, PassManagerBase &PM) {
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if (Builder.OptLevel > 0)
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PM.add(createObjCARCAPElimPass());
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}
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static void addObjCARCExpandPass(const PassManagerBuilder &Builder, PassManagerBase &PM) {
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if (Builder.OptLevel > 0)
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PM.add(createObjCARCExpandPass());
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}
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static void addObjCARCOptPass(const PassManagerBuilder &Builder, PassManagerBase &PM) {
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if (Builder.OptLevel > 0)
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PM.add(createObjCARCOptPass());
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}
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static void addAddDiscriminatorsPass(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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PM.add(createAddDiscriminatorsPass());
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}
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static void addCleanupPassesForSampleProfiler(
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const PassManagerBuilder &Builder, legacy::PassManagerBase &PM) {
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// instcombine is needed before sample profile annotation because it converts
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// certain function calls to be inlinable. simplifycfg and sroa are needed
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// before instcombine for necessary preparation. E.g. load store is eliminated
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// properly so that instcombine will not introduce unecessary liverange.
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PM.add(createCFGSimplificationPass());
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PM.add(createSROAPass());
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PM.add(createInstructionCombiningPass());
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}
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static void addBoundsCheckingPass(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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PM.add(createBoundsCheckingPass());
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}
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static void addSanitizerCoveragePass(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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const PassManagerBuilderWrapper &BuilderWrapper =
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static_cast<const PassManagerBuilderWrapper&>(Builder);
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const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();
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SanitizerCoverageOptions Opts;
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Opts.CoverageType =
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static_cast<SanitizerCoverageOptions::Type>(CGOpts.SanitizeCoverageType);
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Opts.IndirectCalls = CGOpts.SanitizeCoverageIndirectCalls;
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Opts.TraceBB = CGOpts.SanitizeCoverageTraceBB;
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Opts.TraceCmp = CGOpts.SanitizeCoverageTraceCmp;
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Opts.Use8bitCounters = CGOpts.SanitizeCoverage8bitCounters;
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Opts.TracePC = CGOpts.SanitizeCoverageTracePC;
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PM.add(createSanitizerCoverageModulePass(Opts));
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}
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static void addAddressSanitizerPasses(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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const PassManagerBuilderWrapper &BuilderWrapper =
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static_cast<const PassManagerBuilderWrapper&>(Builder);
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const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();
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bool Recover = CGOpts.SanitizeRecover.has(SanitizerKind::Address);
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bool UseAfterScope = CGOpts.SanitizeAddressUseAfterScope;
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PM.add(createAddressSanitizerFunctionPass(/*CompileKernel*/ false, Recover,
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UseAfterScope));
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PM.add(createAddressSanitizerModulePass(/*CompileKernel*/false, Recover));
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}
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static void addKernelAddressSanitizerPasses(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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PM.add(createAddressSanitizerFunctionPass(
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/*CompileKernel*/ true,
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/*Recover*/ true, /*UseAfterScope*/ false));
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PM.add(createAddressSanitizerModulePass(/*CompileKernel*/true,
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/*Recover*/true));
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}
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static void addMemorySanitizerPass(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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const PassManagerBuilderWrapper &BuilderWrapper =
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static_cast<const PassManagerBuilderWrapper&>(Builder);
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const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();
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PM.add(createMemorySanitizerPass(CGOpts.SanitizeMemoryTrackOrigins));
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// MemorySanitizer inserts complex instrumentation that mostly follows
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// the logic of the original code, but operates on "shadow" values.
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// It can benefit from re-running some general purpose optimization passes.
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if (Builder.OptLevel > 0) {
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PM.add(createEarlyCSEPass());
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PM.add(createReassociatePass());
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PM.add(createLICMPass());
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PM.add(createGVNPass());
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PM.add(createInstructionCombiningPass());
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PM.add(createDeadStoreEliminationPass());
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}
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}
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static void addThreadSanitizerPass(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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PM.add(createThreadSanitizerPass());
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}
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static void addDataFlowSanitizerPass(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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const PassManagerBuilderWrapper &BuilderWrapper =
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static_cast<const PassManagerBuilderWrapper&>(Builder);
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const LangOptions &LangOpts = BuilderWrapper.getLangOpts();
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PM.add(createDataFlowSanitizerPass(LangOpts.SanitizerBlacklistFiles));
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}
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static void addEfficiencySanitizerPass(const PassManagerBuilder &Builder,
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legacy::PassManagerBase &PM) {
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const PassManagerBuilderWrapper &BuilderWrapper =
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static_cast<const PassManagerBuilderWrapper&>(Builder);
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const LangOptions &LangOpts = BuilderWrapper.getLangOpts();
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EfficiencySanitizerOptions Opts;
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if (LangOpts.Sanitize.has(SanitizerKind::EfficiencyCacheFrag))
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Opts.ToolType = EfficiencySanitizerOptions::ESAN_CacheFrag;
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else if (LangOpts.Sanitize.has(SanitizerKind::EfficiencyWorkingSet))
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Opts.ToolType = EfficiencySanitizerOptions::ESAN_WorkingSet;
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PM.add(createEfficiencySanitizerPass(Opts));
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}
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static TargetLibraryInfoImpl *createTLII(llvm::Triple &TargetTriple,
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const CodeGenOptions &CodeGenOpts) {
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TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);
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if (!CodeGenOpts.SimplifyLibCalls)
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TLII->disableAllFunctions();
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else {
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// Disable individual libc/libm calls in TargetLibraryInfo.
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LibFunc::Func F;
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for (auto &FuncName : CodeGenOpts.getNoBuiltinFuncs())
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if (TLII->getLibFunc(FuncName, F))
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TLII->setUnavailable(F);
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}
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switch (CodeGenOpts.getVecLib()) {
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case CodeGenOptions::Accelerate:
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TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::Accelerate);
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break;
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default:
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break;
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}
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return TLII;
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}
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static void addSymbolRewriterPass(const CodeGenOptions &Opts,
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legacy::PassManager *MPM) {
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llvm::SymbolRewriter::RewriteDescriptorList DL;
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llvm::SymbolRewriter::RewriteMapParser MapParser;
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for (const auto &MapFile : Opts.RewriteMapFiles)
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MapParser.parse(MapFile, &DL);
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MPM->add(createRewriteSymbolsPass(DL));
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}
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void EmitAssemblyHelper::CreatePasses(ModuleSummaryIndex *ModuleSummary) {
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if (CodeGenOpts.DisableLLVMPasses)
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return;
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unsigned OptLevel = CodeGenOpts.OptimizationLevel;
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CodeGenOptions::InliningMethod Inlining = CodeGenOpts.getInlining();
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// Handle disabling of LLVM optimization, where we want to preserve the
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// internal module before any optimization.
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if (CodeGenOpts.DisableLLVMOpts) {
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OptLevel = 0;
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Inlining = CodeGenOpts.NoInlining;
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}
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PassManagerBuilderWrapper PMBuilder(CodeGenOpts, LangOpts);
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// Figure out TargetLibraryInfo.
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Triple TargetTriple(TheModule->getTargetTriple());
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PMBuilder.LibraryInfo = createTLII(TargetTriple, CodeGenOpts);
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switch (Inlining) {
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case CodeGenOptions::NoInlining:
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break;
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case CodeGenOptions::NormalInlining:
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case CodeGenOptions::OnlyHintInlining: {
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PMBuilder.Inliner =
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createFunctionInliningPass(OptLevel, CodeGenOpts.OptimizeSize);
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break;
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}
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case CodeGenOptions::OnlyAlwaysInlining:
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// Respect always_inline.
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if (OptLevel == 0)
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// Do not insert lifetime intrinsics at -O0.
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PMBuilder.Inliner = createAlwaysInlinerPass(false);
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else
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PMBuilder.Inliner = createAlwaysInlinerPass();
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break;
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}
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PMBuilder.OptLevel = OptLevel;
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PMBuilder.SizeLevel = CodeGenOpts.OptimizeSize;
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PMBuilder.BBVectorize = CodeGenOpts.VectorizeBB;
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PMBuilder.SLPVectorize = CodeGenOpts.VectorizeSLP;
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PMBuilder.LoopVectorize = CodeGenOpts.VectorizeLoop;
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PMBuilder.DisableUnrollLoops = !CodeGenOpts.UnrollLoops;
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PMBuilder.MergeFunctions = CodeGenOpts.MergeFunctions;
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PMBuilder.PrepareForThinLTO = CodeGenOpts.EmitSummaryIndex;
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PMBuilder.PrepareForLTO = CodeGenOpts.PrepareForLTO;
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PMBuilder.RerollLoops = CodeGenOpts.RerollLoops;
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legacy::PassManager *MPM = getPerModulePasses();
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// If we are performing a ThinLTO importing compile, invoke the LTO
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// pipeline and pass down the in-memory module summary index.
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if (ModuleSummary) {
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PMBuilder.ModuleSummary = ModuleSummary;
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PMBuilder.populateThinLTOPassManager(*MPM);
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return;
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}
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// Add target-specific passes that need to run as early as possible.
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if (TM)
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PMBuilder.addExtension(
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PassManagerBuilder::EP_EarlyAsPossible,
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[&](const PassManagerBuilder &, legacy::PassManagerBase &PM) {
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TM->addEarlyAsPossiblePasses(PM);
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});
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PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
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addAddDiscriminatorsPass);
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// In ObjC ARC mode, add the main ARC optimization passes.
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if (LangOpts.ObjCAutoRefCount) {
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PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
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addObjCARCExpandPass);
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PMBuilder.addExtension(PassManagerBuilder::EP_ModuleOptimizerEarly,
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addObjCARCAPElimPass);
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PMBuilder.addExtension(PassManagerBuilder::EP_ScalarOptimizerLate,
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addObjCARCOptPass);
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}
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if (LangOpts.Sanitize.has(SanitizerKind::LocalBounds)) {
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PMBuilder.addExtension(PassManagerBuilder::EP_ScalarOptimizerLate,
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addBoundsCheckingPass);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addBoundsCheckingPass);
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}
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if (CodeGenOpts.SanitizeCoverageType ||
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CodeGenOpts.SanitizeCoverageIndirectCalls ||
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CodeGenOpts.SanitizeCoverageTraceCmp) {
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PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
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addSanitizerCoveragePass);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addSanitizerCoveragePass);
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}
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if (LangOpts.Sanitize.has(SanitizerKind::Address)) {
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PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
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addAddressSanitizerPasses);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addAddressSanitizerPasses);
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}
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if (LangOpts.Sanitize.has(SanitizerKind::KernelAddress)) {
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PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
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addKernelAddressSanitizerPasses);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addKernelAddressSanitizerPasses);
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}
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if (LangOpts.Sanitize.has(SanitizerKind::Memory)) {
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PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
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addMemorySanitizerPass);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addMemorySanitizerPass);
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}
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if (LangOpts.Sanitize.has(SanitizerKind::Thread)) {
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PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
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addThreadSanitizerPass);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addThreadSanitizerPass);
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}
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if (LangOpts.Sanitize.has(SanitizerKind::DataFlow)) {
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PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
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addDataFlowSanitizerPass);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addDataFlowSanitizerPass);
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}
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if (LangOpts.Sanitize.hasOneOf(SanitizerKind::Efficiency)) {
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PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,
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addEfficiencySanitizerPass);
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PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,
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addEfficiencySanitizerPass);
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}
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// Set up the per-function pass manager.
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legacy::FunctionPassManager *FPM = getPerFunctionPasses();
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if (CodeGenOpts.VerifyModule)
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FPM->add(createVerifierPass());
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// Set up the per-module pass manager.
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if (!CodeGenOpts.RewriteMapFiles.empty())
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addSymbolRewriterPass(CodeGenOpts, MPM);
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if (!CodeGenOpts.DisableGCov &&
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(CodeGenOpts.EmitGcovArcs || CodeGenOpts.EmitGcovNotes)) {
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// Not using 'GCOVOptions::getDefault' allows us to avoid exiting if
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// LLVM's -default-gcov-version flag is set to something invalid.
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GCOVOptions Options;
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|
Options.EmitNotes = CodeGenOpts.EmitGcovNotes;
|
|
Options.EmitData = CodeGenOpts.EmitGcovArcs;
|
|
memcpy(Options.Version, CodeGenOpts.CoverageVersion, 4);
|
|
Options.UseCfgChecksum = CodeGenOpts.CoverageExtraChecksum;
|
|
Options.NoRedZone = CodeGenOpts.DisableRedZone;
|
|
Options.FunctionNamesInData =
|
|
!CodeGenOpts.CoverageNoFunctionNamesInData;
|
|
Options.ExitBlockBeforeBody = CodeGenOpts.CoverageExitBlockBeforeBody;
|
|
MPM->add(createGCOVProfilerPass(Options));
|
|
if (CodeGenOpts.getDebugInfo() == codegenoptions::NoDebugInfo)
|
|
MPM->add(createStripSymbolsPass(true));
|
|
}
|
|
|
|
if (CodeGenOpts.hasProfileClangInstr()) {
|
|
InstrProfOptions Options;
|
|
Options.NoRedZone = CodeGenOpts.DisableRedZone;
|
|
Options.InstrProfileOutput = CodeGenOpts.InstrProfileOutput;
|
|
MPM->add(createInstrProfilingLegacyPass(Options));
|
|
}
|
|
if (CodeGenOpts.hasProfileIRInstr()) {
|
|
if (!CodeGenOpts.InstrProfileOutput.empty())
|
|
PMBuilder.PGOInstrGen = CodeGenOpts.InstrProfileOutput;
|
|
else
|
|
PMBuilder.PGOInstrGen = "default.profraw";
|
|
}
|
|
if (CodeGenOpts.hasProfileIRUse())
|
|
PMBuilder.PGOInstrUse = CodeGenOpts.ProfileInstrumentUsePath;
|
|
|
|
if (!CodeGenOpts.SampleProfileFile.empty()) {
|
|
MPM->add(createPruneEHPass());
|
|
MPM->add(createSampleProfileLoaderPass(CodeGenOpts.SampleProfileFile));
|
|
PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,
|
|
addCleanupPassesForSampleProfiler);
|
|
}
|
|
|
|
PMBuilder.populateFunctionPassManager(*FPM);
|
|
PMBuilder.populateModulePassManager(*MPM);
|
|
}
|
|
|
|
void EmitAssemblyHelper::setCommandLineOpts() {
|
|
SmallVector<const char *, 16> 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());
|
|
}
|
|
for (const std::string &BackendOption : CodeGenOpts.BackendOptions)
|
|
BackendArgs.push_back(BackendOption.c_str());
|
|
BackendArgs.push_back(nullptr);
|
|
llvm::cl::ParseCommandLineOptions(BackendArgs.size() - 1,
|
|
BackendArgs.data());
|
|
}
|
|
|
|
TargetMachine *EmitAssemblyHelper::CreateTargetMachine(bool MustCreateTM) {
|
|
// Create the TargetMachine for generating code.
|
|
std::string Error;
|
|
std::string Triple = TheModule->getTargetTriple();
|
|
const llvm::Target *TheTarget = TargetRegistry::lookupTarget(Triple, Error);
|
|
if (!TheTarget) {
|
|
if (MustCreateTM)
|
|
Diags.Report(diag::err_fe_unable_to_create_target) << Error;
|
|
return nullptr;
|
|
}
|
|
|
|
unsigned CodeModel =
|
|
llvm::StringSwitch<unsigned>(CodeGenOpts.CodeModel)
|
|
.Case("small", llvm::CodeModel::Small)
|
|
.Case("kernel", llvm::CodeModel::Kernel)
|
|
.Case("medium", llvm::CodeModel::Medium)
|
|
.Case("large", llvm::CodeModel::Large)
|
|
.Case("default", llvm::CodeModel::Default)
|
|
.Default(~0u);
|
|
assert(CodeModel != ~0u && "invalid code model!");
|
|
llvm::CodeModel::Model CM = static_cast<llvm::CodeModel::Model>(CodeModel);
|
|
|
|
std::string FeaturesStr =
|
|
llvm::join(TargetOpts.Features.begin(), TargetOpts.Features.end(), ",");
|
|
|
|
// Keep this synced with the equivalent code in tools/driver/cc1as_main.cpp.
|
|
llvm::Optional<llvm::Reloc::Model> RM;
|
|
if (CodeGenOpts.RelocationModel == "static") {
|
|
RM = llvm::Reloc::Static;
|
|
} else if (CodeGenOpts.RelocationModel == "pic") {
|
|
RM = llvm::Reloc::PIC_;
|
|
} else {
|
|
assert(CodeGenOpts.RelocationModel == "dynamic-no-pic" &&
|
|
"Invalid PIC model!");
|
|
RM = llvm::Reloc::DynamicNoPIC;
|
|
}
|
|
|
|
CodeGenOpt::Level OptLevel = CodeGenOpt::Default;
|
|
switch (CodeGenOpts.OptimizationLevel) {
|
|
default: break;
|
|
case 0: OptLevel = CodeGenOpt::None; break;
|
|
case 3: OptLevel = CodeGenOpt::Aggressive; break;
|
|
}
|
|
|
|
llvm::TargetOptions Options;
|
|
|
|
if (!TargetOpts.Reciprocals.empty())
|
|
Options.Reciprocals = TargetRecip(TargetOpts.Reciprocals);
|
|
|
|
Options.ThreadModel =
|
|
llvm::StringSwitch<llvm::ThreadModel::Model>(CodeGenOpts.ThreadModel)
|
|
.Case("posix", llvm::ThreadModel::POSIX)
|
|
.Case("single", llvm::ThreadModel::Single);
|
|
|
|
// Set float ABI type.
|
|
assert((CodeGenOpts.FloatABI == "soft" || CodeGenOpts.FloatABI == "softfp" ||
|
|
CodeGenOpts.FloatABI == "hard" || CodeGenOpts.FloatABI.empty()) &&
|
|
"Invalid Floating Point ABI!");
|
|
Options.FloatABIType =
|
|
llvm::StringSwitch<llvm::FloatABI::ABIType>(CodeGenOpts.FloatABI)
|
|
.Case("soft", llvm::FloatABI::Soft)
|
|
.Case("softfp", llvm::FloatABI::Soft)
|
|
.Case("hard", llvm::FloatABI::Hard)
|
|
.Default(llvm::FloatABI::Default);
|
|
|
|
// Set FP fusion mode.
|
|
switch (CodeGenOpts.getFPContractMode()) {
|
|
case CodeGenOptions::FPC_Off:
|
|
Options.AllowFPOpFusion = llvm::FPOpFusion::Strict;
|
|
break;
|
|
case CodeGenOptions::FPC_On:
|
|
Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;
|
|
break;
|
|
case CodeGenOptions::FPC_Fast:
|
|
Options.AllowFPOpFusion = llvm::FPOpFusion::Fast;
|
|
break;
|
|
}
|
|
|
|
Options.UseInitArray = CodeGenOpts.UseInitArray;
|
|
Options.DisableIntegratedAS = CodeGenOpts.DisableIntegratedAS;
|
|
Options.CompressDebugSections = CodeGenOpts.CompressDebugSections;
|
|
Options.RelaxELFRelocations = CodeGenOpts.RelaxELFRelocations;
|
|
|
|
// Set EABI version.
|
|
Options.EABIVersion = llvm::StringSwitch<llvm::EABI>(TargetOpts.EABIVersion)
|
|
.Case("4", llvm::EABI::EABI4)
|
|
.Case("5", llvm::EABI::EABI5)
|
|
.Case("gnu", llvm::EABI::GNU)
|
|
.Default(llvm::EABI::Default);
|
|
|
|
if (LangOpts.SjLjExceptions)
|
|
Options.ExceptionModel = llvm::ExceptionHandling::SjLj;
|
|
|
|
Options.LessPreciseFPMADOption = CodeGenOpts.LessPreciseFPMAD;
|
|
Options.NoInfsFPMath = CodeGenOpts.NoInfsFPMath;
|
|
Options.NoNaNsFPMath = CodeGenOpts.NoNaNsFPMath;
|
|
Options.NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;
|
|
Options.UnsafeFPMath = CodeGenOpts.UnsafeFPMath;
|
|
Options.StackAlignmentOverride = CodeGenOpts.StackAlignment;
|
|
Options.FunctionSections = CodeGenOpts.FunctionSections;
|
|
Options.DataSections = CodeGenOpts.DataSections;
|
|
Options.UniqueSectionNames = CodeGenOpts.UniqueSectionNames;
|
|
Options.EmulatedTLS = CodeGenOpts.EmulatedTLS;
|
|
Options.DebuggerTuning = CodeGenOpts.getDebuggerTuning();
|
|
|
|
Options.MCOptions.MCRelaxAll = CodeGenOpts.RelaxAll;
|
|
Options.MCOptions.MCSaveTempLabels = CodeGenOpts.SaveTempLabels;
|
|
Options.MCOptions.MCUseDwarfDirectory = !CodeGenOpts.NoDwarfDirectoryAsm;
|
|
Options.MCOptions.MCNoExecStack = CodeGenOpts.NoExecStack;
|
|
Options.MCOptions.MCIncrementalLinkerCompatible =
|
|
CodeGenOpts.IncrementalLinkerCompatible;
|
|
Options.MCOptions.MCFatalWarnings = CodeGenOpts.FatalWarnings;
|
|
Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;
|
|
Options.MCOptions.ABIName = TargetOpts.ABI;
|
|
|
|
TargetMachine *TM = TheTarget->createTargetMachine(Triple, TargetOpts.CPU,
|
|
FeaturesStr, Options,
|
|
RM, CM, OptLevel);
|
|
|
|
return TM;
|
|
}
|
|
|
|
bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
|
|
raw_pwrite_stream &OS) {
|
|
|
|
// Create the code generator passes.
|
|
legacy::PassManager *PM = getCodeGenPasses();
|
|
|
|
// Add LibraryInfo.
|
|
llvm::Triple TargetTriple(TheModule->getTargetTriple());
|
|
std::unique_ptr<TargetLibraryInfoImpl> TLII(
|
|
createTLII(TargetTriple, CodeGenOpts));
|
|
PM->add(new TargetLibraryInfoWrapperPass(*TLII));
|
|
|
|
// 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!");
|
|
|
|
// Add ObjC ARC final-cleanup optimizations. This is done as part of the
|
|
// "codegen" passes so that it isn't run multiple times when there is
|
|
// inlining happening.
|
|
if (CodeGenOpts.OptimizationLevel > 0)
|
|
PM->add(createObjCARCContractPass());
|
|
|
|
if (TM->addPassesToEmitFile(*PM, OS, CGFT,
|
|
/*DisableVerify=*/!CodeGenOpts.VerifyModule)) {
|
|
Diags.Report(diag::err_fe_unable_to_interface_with_target);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void EmitAssemblyHelper::EmitAssembly(BackendAction Action,
|
|
raw_pwrite_stream *OS) {
|
|
TimeRegion Region(llvm::TimePassesIsEnabled ? &CodeGenerationTime : nullptr);
|
|
|
|
setCommandLineOpts();
|
|
|
|
bool UsesCodeGen = (Action != Backend_EmitNothing &&
|
|
Action != Backend_EmitBC &&
|
|
Action != Backend_EmitLL);
|
|
if (!TM)
|
|
TM.reset(CreateTargetMachine(UsesCodeGen));
|
|
|
|
if (UsesCodeGen && !TM)
|
|
return;
|
|
if (TM)
|
|
TheModule->setDataLayout(TM->createDataLayout());
|
|
|
|
// If we are performing a ThinLTO importing compile, load the function
|
|
// index into memory and pass it into CreatePasses, which will add it
|
|
// to the PassManagerBuilder and invoke LTO passes.
|
|
std::unique_ptr<ModuleSummaryIndex> ModuleSummary;
|
|
if (!CodeGenOpts.ThinLTOIndexFile.empty()) {
|
|
ErrorOr<std::unique_ptr<ModuleSummaryIndex>> IndexOrErr =
|
|
llvm::getModuleSummaryIndexForFile(
|
|
CodeGenOpts.ThinLTOIndexFile, [&](const DiagnosticInfo &DI) {
|
|
TheModule->getContext().diagnose(DI);
|
|
});
|
|
if (std::error_code EC = IndexOrErr.getError()) {
|
|
std::string Error = EC.message();
|
|
errs() << "Error loading index file '" << CodeGenOpts.ThinLTOIndexFile
|
|
<< "': " << Error << "\n";
|
|
return;
|
|
}
|
|
ModuleSummary = std::move(IndexOrErr.get());
|
|
assert(ModuleSummary && "Expected non-empty module summary index");
|
|
}
|
|
|
|
CreatePasses(ModuleSummary.get());
|
|
|
|
switch (Action) {
|
|
case Backend_EmitNothing:
|
|
break;
|
|
|
|
case Backend_EmitBC:
|
|
getPerModulePasses()->add(createBitcodeWriterPass(
|
|
*OS, CodeGenOpts.EmitLLVMUseLists, CodeGenOpts.EmitSummaryIndex,
|
|
CodeGenOpts.EmitSummaryIndex));
|
|
break;
|
|
|
|
case Backend_EmitLL:
|
|
getPerModulePasses()->add(
|
|
createPrintModulePass(*OS, "", CodeGenOpts.EmitLLVMUseLists));
|
|
break;
|
|
|
|
default:
|
|
if (!AddEmitPasses(Action, *OS))
|
|
return;
|
|
}
|
|
|
|
// Before executing passes, print the final values of the LLVM options.
|
|
cl::PrintOptionValues();
|
|
|
|
// 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 (Function &F : *TheModule)
|
|
if (!F.isDeclaration())
|
|
PerFunctionPasses->run(F);
|
|
PerFunctionPasses->doFinalization();
|
|
}
|
|
|
|
if (PerModulePasses) {
|
|
PrettyStackTraceString CrashInfo("Per-module optimization passes");
|
|
PerModulePasses->run(*TheModule);
|
|
}
|
|
|
|
if (CodeGenPasses) {
|
|
PrettyStackTraceString CrashInfo("Code generation");
|
|
CodeGenPasses->run(*TheModule);
|
|
}
|
|
}
|
|
|
|
void clang::EmitBackendOutput(DiagnosticsEngine &Diags,
|
|
const CodeGenOptions &CGOpts,
|
|
const clang::TargetOptions &TOpts,
|
|
const LangOptions &LOpts, const llvm::DataLayout &TDesc,
|
|
Module *M, BackendAction Action,
|
|
raw_pwrite_stream *OS) {
|
|
EmitAssemblyHelper AsmHelper(Diags, CGOpts, TOpts, LOpts, M);
|
|
|
|
AsmHelper.EmitAssembly(Action, OS);
|
|
|
|
// Verify clang's TargetInfo DataLayout against the LLVM TargetMachine's
|
|
// DataLayout.
|
|
if (AsmHelper.TM) {
|
|
std::string DLDesc = M->getDataLayout().getStringRepresentation();
|
|
if (DLDesc != TDesc.getStringRepresentation()) {
|
|
unsigned DiagID = Diags.getCustomDiagID(
|
|
DiagnosticsEngine::Error, "backend data layout '%0' does not match "
|
|
"expected target description '%1'");
|
|
Diags.Report(DiagID) << DLDesc << TDesc.getStringRepresentation();
|
|
}
|
|
}
|
|
}
|
|
|
|
static const char* getSectionNameForBitcode(const Triple &T) {
|
|
switch (T.getObjectFormat()) {
|
|
case Triple::MachO:
|
|
return "__LLVM,__bitcode";
|
|
case Triple::COFF:
|
|
case Triple::ELF:
|
|
case Triple::UnknownObjectFormat:
|
|
return ".llvmbc";
|
|
}
|
|
llvm_unreachable("Unimplemented ObjectFormatType");
|
|
}
|
|
|
|
static const char* getSectionNameForCommandline(const Triple &T) {
|
|
switch (T.getObjectFormat()) {
|
|
case Triple::MachO:
|
|
return "__LLVM,__cmdline";
|
|
case Triple::COFF:
|
|
case Triple::ELF:
|
|
case Triple::UnknownObjectFormat:
|
|
return ".llvmcmd";
|
|
}
|
|
llvm_unreachable("Unimplemented ObjectFormatType");
|
|
}
|
|
|
|
// With -fembed-bitcode, save a copy of the llvm IR as data in the
|
|
// __LLVM,__bitcode section.
|
|
void clang::EmbedBitcode(llvm::Module *M, const CodeGenOptions &CGOpts,
|
|
llvm::MemoryBufferRef Buf) {
|
|
if (CGOpts.getEmbedBitcode() == CodeGenOptions::Embed_Off)
|
|
return;
|
|
|
|
// Save llvm.compiler.used and remote it.
|
|
SmallVector<Constant*, 2> UsedArray;
|
|
SmallSet<GlobalValue*, 4> UsedGlobals;
|
|
Type *UsedElementType = Type::getInt8Ty(M->getContext())->getPointerTo(0);
|
|
GlobalVariable *Used = collectUsedGlobalVariables(*M, UsedGlobals, true);
|
|
for (auto *GV : UsedGlobals) {
|
|
if (GV->getName() != "llvm.embedded.module" &&
|
|
GV->getName() != "llvm.cmdline")
|
|
UsedArray.push_back(
|
|
ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType));
|
|
}
|
|
if (Used)
|
|
Used->eraseFromParent();
|
|
|
|
// Embed the bitcode for the llvm module.
|
|
std::string Data;
|
|
ArrayRef<uint8_t> ModuleData;
|
|
Triple T(M->getTargetTriple());
|
|
// Create a constant that contains the bitcode.
|
|
// In case of embedding a marker, ignore the input Buf and use the empty
|
|
// ArrayRef. It is also legal to create a bitcode marker even Buf is empty.
|
|
if (CGOpts.getEmbedBitcode() != CodeGenOptions::Embed_Marker) {
|
|
if (!isBitcode((const unsigned char *)Buf.getBufferStart(),
|
|
(const unsigned char *)Buf.getBufferEnd())) {
|
|
// If the input is LLVM Assembly, bitcode is produced by serializing
|
|
// the module. Use-lists order need to be perserved in this case.
|
|
llvm::raw_string_ostream OS(Data);
|
|
llvm::WriteBitcodeToFile(M, OS, /* ShouldPreserveUseListOrder */ true);
|
|
ModuleData =
|
|
ArrayRef<uint8_t>((const uint8_t *)OS.str().data(), OS.str().size());
|
|
} else
|
|
// If the input is LLVM bitcode, write the input byte stream directly.
|
|
ModuleData = ArrayRef<uint8_t>((const uint8_t *)Buf.getBufferStart(),
|
|
Buf.getBufferSize());
|
|
}
|
|
llvm::Constant *ModuleConstant =
|
|
llvm::ConstantDataArray::get(M->getContext(), ModuleData);
|
|
llvm::GlobalVariable *GV = new llvm::GlobalVariable(
|
|
*M, ModuleConstant->getType(), true, llvm::GlobalValue::PrivateLinkage,
|
|
ModuleConstant);
|
|
GV->setSection(getSectionNameForBitcode(T));
|
|
UsedArray.push_back(
|
|
ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType));
|
|
if (llvm::GlobalVariable *Old =
|
|
M->getGlobalVariable("llvm.embedded.module", true)) {
|
|
assert(Old->hasOneUse() &&
|
|
"llvm.embedded.module can only be used once in llvm.compiler.used");
|
|
GV->takeName(Old);
|
|
Old->eraseFromParent();
|
|
} else {
|
|
GV->setName("llvm.embedded.module");
|
|
}
|
|
|
|
// Skip if only bitcode needs to be embedded.
|
|
if (CGOpts.getEmbedBitcode() != CodeGenOptions::Embed_Bitcode) {
|
|
// Embed command-line options.
|
|
ArrayRef<uint8_t> CmdData(const_cast<uint8_t *>(CGOpts.CmdArgs.data()),
|
|
CGOpts.CmdArgs.size());
|
|
llvm::Constant *CmdConstant =
|
|
llvm::ConstantDataArray::get(M->getContext(), CmdData);
|
|
GV = new llvm::GlobalVariable(*M, CmdConstant->getType(), true,
|
|
llvm::GlobalValue::PrivateLinkage,
|
|
CmdConstant);
|
|
GV->setSection(getSectionNameForCommandline(T));
|
|
UsedArray.push_back(
|
|
ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, UsedElementType));
|
|
if (llvm::GlobalVariable *Old =
|
|
M->getGlobalVariable("llvm.cmdline", true)) {
|
|
assert(Old->hasOneUse() &&
|
|
"llvm.cmdline can only be used once in llvm.compiler.used");
|
|
GV->takeName(Old);
|
|
Old->eraseFromParent();
|
|
} else {
|
|
GV->setName("llvm.cmdline");
|
|
}
|
|
}
|
|
|
|
if (UsedArray.empty())
|
|
return;
|
|
|
|
// Recreate llvm.compiler.used.
|
|
ArrayType *ATy = ArrayType::get(UsedElementType, UsedArray.size());
|
|
auto *NewUsed = new GlobalVariable(
|
|
*M, ATy, false, llvm::GlobalValue::AppendingLinkage,
|
|
llvm::ConstantArray::get(ATy, UsedArray), "llvm.compiler.used");
|
|
NewUsed->setSection("llvm.metadata");
|
|
}
|