//===--- BackendUtil.cpp - LLVM Backend Utilities -------------------------===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

#include "clang/CodeGen/BackendUtil.h"

#include "clang/Basic/CodeGenOptions.h"

#include "clang/Basic/Diagnostic.h"

#include "clang/Basic/LangOptions.h"

#include "clang/Basic/TargetOptions.h"

#include "clang/Frontend/FrontendDiagnostic.h"

#include "clang/Frontend/Utils.h"

#include "clang/Lex/HeaderSearchOptions.h"

#include "llvm/ADT/SmallSet.h"

#include "llvm/ADT/StringExtras.h"

#include "llvm/ADT/StringSwitch.h"

#include "llvm/ADT/Triple.h"

#include "llvm/Analysis/StackSafetyAnalysis.h"

#include "llvm/Analysis/TargetLibraryInfo.h"

#include "llvm/Analysis/TargetTransformInfo.h"

#include "llvm/Bitcode/BitcodeReader.h"

#include "llvm/Bitcode/BitcodeWriter.h"

#include "llvm/Bitcode/BitcodeWriterPass.h"

#include "llvm/CodeGen/RegAllocRegistry.h"

#include "llvm/CodeGen/SchedulerRegistry.h"

#include "llvm/CodeGen/TargetSubtargetInfo.h"

#include "llvm/IR/DataLayout.h"

#include "llvm/IR/IRPrintingPasses.h"

#include "llvm/IR/LegacyPassManager.h"

#include "llvm/IR/Module.h"

#include "llvm/IR/ModuleSummaryIndex.h"

#include "llvm/IR/PassManager.h"

#include "llvm/IR/Verifier.h"

#include "llvm/LTO/LTOBackend.h"

#include "llvm/MC/MCAsmInfo.h"

#include "llvm/MC/SubtargetFeature.h"

#include "llvm/Passes/PassBuilder.h"

#include "llvm/Passes/PassPlugin.h"

#include "llvm/Passes/StandardInstrumentations.h"

#include "llvm/Support/BuryPointer.h"

#include "llvm/Support/CommandLine.h"

#include "llvm/Support/MemoryBuffer.h"

#include "llvm/Support/PrettyStackTrace.h"

#include "llvm/Support/TargetRegistry.h"

#include "llvm/Support/TimeProfiler.h"

#include "llvm/Support/Timer.h"

#include "llvm/Support/ToolOutputFile.h"

#include "llvm/Support/raw_ostream.h"

#include "llvm/Target/TargetMachine.h"

#include "llvm/Target/TargetOptions.h"

#include "llvm/Transforms/Coroutines.h"

#include "llvm/Transforms/Coroutines/CoroCleanup.h"

#include "llvm/Transforms/Coroutines/CoroEarly.h"

#include "llvm/Transforms/Coroutines/CoroElide.h"

#include "llvm/Transforms/Coroutines/CoroSplit.h"

#include "llvm/Transforms/IPO.h"

#include "llvm/Transforms/IPO/AlwaysInliner.h"

#include "llvm/Transforms/IPO/LowerTypeTests.h"

#include "llvm/Transforms/IPO/PassManagerBuilder.h"

#include "llvm/Transforms/IPO/ThinLTOBitcodeWriter.h"

#include "llvm/Transforms/InstCombine/InstCombine.h"

#include "llvm/Transforms/Instrumentation.h"

#include "llvm/Transforms/Instrumentation/AddressSanitizer.h"

#include "llvm/Transforms/Instrumentation/BoundsChecking.h"

#include "llvm/Transforms/Instrumentation/GCOVProfiler.h"

#include "llvm/Transforms/Instrumentation/HWAddressSanitizer.h"

#include "llvm/Transforms/Instrumentation/InstrProfiling.h"

#include "llvm/Transforms/Instrumentation/MemProfiler.h"

#include "llvm/Transforms/Instrumentation/MemorySanitizer.h"

#include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"

#include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"

#include "llvm/Transforms/ObjCARC.h"

#include "llvm/Transforms/Scalar.h"

#include "llvm/Transforms/Scalar/GVN.h"

#include "llvm/Transforms/Scalar/LowerMatrixIntrinsics.h"

#include "llvm/Transforms/Utils.h"

#include "llvm/Transforms/Utils/CanonicalizeAliases.h"

#include "llvm/Transforms/Utils/EntryExitInstrumenter.h"

#include "llvm/Transforms/Utils/NameAnonGlobals.h"

#include "llvm/Transforms/Utils/SymbolRewriter.h"

#include "llvm/Transforms/Utils/UniqueInternalLinkageNames.h"

#include <memory>

using namespace clang;

using namespace llvm;

#define HANDLE_EXTENSION(Ext)                                                  \

  llvm::PassPluginLibraryInfo get##Ext##PluginInfo();

#include "llvm/Support/Extension.def"

namespace {

// Default filename used for profile generation.

static constexpr StringLiteral DefaultProfileGenName = "default_%m.profraw";

class EmitAssemblyHelper {

  DiagnosticsEngine &Diags;

  const HeaderSearchOptions &HSOpts;

  const CodeGenOptions &CodeGenOpts;

  const clang::TargetOptions &TargetOpts;

  const LangOptions &LangOpts;

  Module *TheModule;

  Timer CodeGenerationTime;

  std::unique_ptr<raw_pwrite_stream> OS;

  TargetIRAnalysis getTargetIRAnalysis() const {

    if (TM)

      return TM->getTargetIRAnalysis();

    return TargetIRAnalysis();

  }

  void CreatePasses(legacy::PassManager &MPM, legacy::FunctionPassManager &FPM);

  /// Generates the TargetMachine.

  /// Leaves TM unchanged if it is unable to create the target machine.

  /// Some of our clang tests specify triples which are not built

  /// into clang. This is okay because these tests check the generated

  /// IR, and they require DataLayout which depends on the triple.

  /// In this case, we allow this method to fail and not report an error.

  /// When MustCreateTM is used, we print an error if we are unable to load

  /// the requested target.

  void CreateTargetMachine(bool MustCreateTM);

  /// Add passes necessary to emit assembly or LLVM IR.

  ///

  /// \return True on success.

  bool AddEmitPasses(legacy::PassManager &CodeGenPasses, BackendAction Action,

                     raw_pwrite_stream &OS, raw_pwrite_stream *DwoOS);

  std::unique_ptr<llvm::ToolOutputFile> openOutputFile(StringRef Path) {

    std::error_code EC;

    auto F = std::make_unique<llvm::ToolOutputFile>(Path, EC,

                                                     llvm::sys::fs::OF_None);

    if (EC) {

      Diags.Report(diag::err_fe_unable_to_open_output) << Path << EC.message();

      F.reset();

    }

    return F;

  }

public:

  EmitAssemblyHelper(DiagnosticsEngine &_Diags,

                     const HeaderSearchOptions &HeaderSearchOpts,

                     const CodeGenOptions &CGOpts,

                     const clang::TargetOptions &TOpts,

                     const LangOptions &LOpts, Module *M)

      : Diags(_Diags), HSOpts(HeaderSearchOpts), CodeGenOpts(CGOpts),

        TargetOpts(TOpts), LangOpts(LOpts), TheModule(M),

        CodeGenerationTime("codegen", "Code Generation Time") {}

  ~EmitAssemblyHelper() {

    if (CodeGenOpts.DisableFree)

      BuryPointer(std::move(TM));

  }

  std::unique_ptr<TargetMachine> TM;

  void EmitAssembly(BackendAction Action,

                    std::unique_ptr<raw_pwrite_stream> OS);

  void EmitAssemblyWithNewPassManager(BackendAction Action,

                                      std::unique_ptr<raw_pwrite_stream> OS);

};

// We need this wrapper to access LangOpts and CGOpts from extension functions

// that we add to the PassManagerBuilder.

class PassManagerBuilderWrapper : public PassManagerBuilder {

public:

  PassManagerBuilderWrapper(const Triple &TargetTriple,

                            const CodeGenOptions &CGOpts,

                            const LangOptions &LangOpts)

      : PassManagerBuilder(), TargetTriple(TargetTriple), CGOpts(CGOpts),

        LangOpts(LangOpts) {}

  const Triple &getTargetTriple() const { return TargetTriple; }

  const CodeGenOptions &getCGOpts() const { return CGOpts; }

  const LangOptions &getLangOpts() const { return LangOpts; }

private:

  const Triple &TargetTriple;

  const CodeGenOptions &CGOpts;

  const LangOptions &LangOpts;

};

}

static void addObjCARCAPElimPass(const PassManagerBuilder &Builder, PassManagerBase &PM) {

  if (Builder.OptLevel > 0)

    PM.add(createObjCARCAPElimPass());

}

static void addObjCARCExpandPass(const PassManagerBuilder &Builder, PassManagerBase &PM) {

  if (Builder.OptLevel > 0)

    PM.add(createObjCARCExpandPass());

}

static void addObjCARCOptPass(const PassManagerBuilder &Builder, PassManagerBase &PM) {

  if (Builder.OptLevel > 0)

    PM.add(createObjCARCOptPass());

}

static void addAddDiscriminatorsPass(const PassManagerBuilder &Builder,

                                     legacy::PassManagerBase &PM) {

  PM.add(createAddDiscriminatorsPass());

}

static void addBoundsCheckingPass(const PassManagerBuilder &Builder,

                                  legacy::PassManagerBase &PM) {

  PM.add(createBoundsCheckingLegacyPass());

}

static SanitizerCoverageOptions

getSancovOptsFromCGOpts(const CodeGenOptions &CGOpts) {

  SanitizerCoverageOptions Opts;

  Opts.CoverageType =

      static_cast<SanitizerCoverageOptions::Type>(CGOpts.SanitizeCoverageType);

  Opts.IndirectCalls = CGOpts.SanitizeCoverageIndirectCalls;

  Opts.TraceBB = CGOpts.SanitizeCoverageTraceBB;

  Opts.TraceCmp = CGOpts.SanitizeCoverageTraceCmp;

  Opts.TraceDiv = CGOpts.SanitizeCoverageTraceDiv;

  Opts.TraceGep = CGOpts.SanitizeCoverageTraceGep;

  Opts.Use8bitCounters = CGOpts.SanitizeCoverage8bitCounters;

  Opts.TracePC = CGOpts.SanitizeCoverageTracePC;

  Opts.TracePCGuard = CGOpts.SanitizeCoverageTracePCGuard;

  Opts.NoPrune = CGOpts.SanitizeCoverageNoPrune;

  Opts.Inline8bitCounters = CGOpts.SanitizeCoverageInline8bitCounters;

  Opts.InlineBoolFlag = CGOpts.SanitizeCoverageInlineBoolFlag;

  Opts.PCTable = CGOpts.SanitizeCoveragePCTable;

  Opts.StackDepth = CGOpts.SanitizeCoverageStackDepth;

  return Opts;

}

static void addSanitizerCoveragePass(const PassManagerBuilder &Builder,

                                     legacy::PassManagerBase &PM) {

  const PassManagerBuilderWrapper &BuilderWrapper =

      static_cast<const PassManagerBuilderWrapper &>(Builder);

  const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();

  auto Opts = getSancovOptsFromCGOpts(CGOpts);

  PM.add(createModuleSanitizerCoverageLegacyPassPass(

      Opts, CGOpts.SanitizeCoverageAllowlistFiles,

      CGOpts.SanitizeCoverageBlocklistFiles));

}

// Check if ASan should use GC-friendly instrumentation for globals.

// First of all, there is no point if -fdata-sections is off (expect for MachO,

// where this is not a factor). Also, on ELF this feature requires an assembler

// extension that only works with -integrated-as at the moment.

static bool asanUseGlobalsGC(const Triple &T, const CodeGenOptions &CGOpts) {

  if (!CGOpts.SanitizeAddressGlobalsDeadStripping)

    return false;

  switch (T.getObjectFormat()) {

  case Triple::MachO:

  case Triple::COFF:

    return true;

  case Triple::ELF:

    return CGOpts.DataSections && 
!CGOpts.DisableIntegratedAS4
;

  case Triple::GOFF:

    llvm::report_fatal_error("ASan not implemented for GOFF");

  case Triple::XCOFF:

    llvm::report_fatal_error("ASan not implemented for XCOFF.");

  case Triple::Wasm:

  case Triple::UnknownObjectFormat:

    break;

  }

  return false;

}

static void addMemProfilerPasses(const PassManagerBuilder &Builder,

                                 legacy::PassManagerBase &PM) {

  PM.add(createMemProfilerFunctionPass());

  PM.add(createModuleMemProfilerLegacyPassPass());

}

static void addAddressSanitizerPasses(const PassManagerBuilder &Builder,

                                      legacy::PassManagerBase &PM) {

  const PassManagerBuilderWrapper &BuilderWrapper =

      static_cast<const PassManagerBuilderWrapper&>(Builder);

  const Triple &T = BuilderWrapper.getTargetTriple();

  const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();

  bool Recover = CGOpts.SanitizeRecover.has(SanitizerKind::Address);

  bool UseAfterScope = CGOpts.SanitizeAddressUseAfterScope;

  bool UseOdrIndicator = CGOpts.SanitizeAddressUseOdrIndicator;

  bool UseGlobalsGC = asanUseGlobalsGC(T, CGOpts);

  PM.add(createAddressSanitizerFunctionPass(/*CompileKernel*/ false, Recover,

                                            UseAfterScope));

  PM.add(createModuleAddressSanitizerLegacyPassPass(

      /*CompileKernel*/ false, Recover, UseGlobalsGC, UseOdrIndicator));

}

static void addKernelAddressSanitizerPasses(const PassManagerBuilder &Builder,

                                            legacy::PassManagerBase &PM) {

  PM.add(createAddressSanitizerFunctionPass(

      /*CompileKernel*/ true, /*Recover*/ true, /*UseAfterScope*/ false));

  PM.add(createModuleAddressSanitizerLegacyPassPass(

      /*CompileKernel*/ true, /*Recover*/ true, /*UseGlobalsGC*/ true,

      /*UseOdrIndicator*/ false));

}

static void addHWAddressSanitizerPasses(const PassManagerBuilder &Builder,

                                            legacy::PassManagerBase &PM) {

  const PassManagerBuilderWrapper &BuilderWrapper =

      static_cast<const PassManagerBuilderWrapper &>(Builder);

  const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();

  bool Recover = CGOpts.SanitizeRecover.has(SanitizerKind::HWAddress);

  PM.add(

      createHWAddressSanitizerLegacyPassPass(/*CompileKernel*/ false, Recover));

}

static void addKernelHWAddressSanitizerPasses(const PassManagerBuilder &Builder,

                                            legacy::PassManagerBase &PM) {

  PM.add(createHWAddressSanitizerLegacyPassPass(

      /*CompileKernel*/ true, /*Recover*/ true));

}

static void addGeneralOptsForMemorySanitizer(const PassManagerBuilder &Builder,

                                             legacy::PassManagerBase &PM,

                                             bool CompileKernel) {

  const PassManagerBuilderWrapper &BuilderWrapper =

      static_cast<const PassManagerBuilderWrapper&>(Builder);

  const CodeGenOptions &CGOpts = BuilderWrapper.getCGOpts();

  int TrackOrigins = CGOpts.SanitizeMemoryTrackOrigins;

  bool Recover = CGOpts.SanitizeRecover.has(SanitizerKind::Memory);

  PM.add(createMemorySanitizerLegacyPassPass(

      MemorySanitizerOptions{TrackOrigins, Recover, CompileKernel}));

  // MemorySanitizer inserts complex instrumentation that mostly follows

  // the logic of the original code, but operates on "shadow" values.

  // It can benefit from re-running some general purpose optimization passes.

  if (Builder.OptLevel > 0) {

    PM.add(createEarlyCSEPass());

    PM.add(createReassociatePass());

    PM.add(createLICMPass());

    PM.add(createGVNPass());

    PM.add(createInstructionCombiningPass());

    PM.add(createDeadStoreEliminationPass());

  }

}

static void addMemorySanitizerPass(const PassManagerBuilder &Builder,

                                   legacy::PassManagerBase &PM) {

  addGeneralOptsForMemorySanitizer(Builder, PM, /*CompileKernel*/ false);

}

static void addKernelMemorySanitizerPass(const PassManagerBuilder &Builder,

                                         legacy::PassManagerBase &PM) {

  addGeneralOptsForMemorySanitizer(Builder, PM, /*CompileKernel*/ true);

}

static void addThreadSanitizerPass(const PassManagerBuilder &Builder,

                                   legacy::PassManagerBase &PM) {

  PM.add(createThreadSanitizerLegacyPassPass());

}

static void addDataFlowSanitizerPass(const PassManagerBuilder &Builder,

                                     legacy::PassManagerBase &PM) {

  const PassManagerBuilderWrapper &BuilderWrapper =

      static_cast<const PassManagerBuilderWrapper&>(Builder);

  const LangOptions &LangOpts = BuilderWrapper.getLangOpts();

  PM.add(

      createDataFlowSanitizerLegacyPassPass(LangOpts.SanitizerBlacklistFiles));

}

static TargetLibraryInfoImpl *createTLII(llvm::Triple &TargetTriple,

                                         const CodeGenOptions &CodeGenOpts) {

  TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);

  switch (CodeGenOpts.getVecLib()) {

  case CodeGenOptions::Accelerate:

    TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::Accelerate);

    break;

  case CodeGenOptions::MASSV:

    TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::MASSV);

    break;

  case CodeGenOptions::SVML:

    TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::SVML);

    break;

  default:

    break;

  }

  return TLII;

}

static void addSymbolRewriterPass(const CodeGenOptions &Opts,

                                  legacy::PassManager *MPM) {

  llvm::SymbolRewriter::RewriteDescriptorList DL;

  llvm::SymbolRewriter::RewriteMapParser MapParser;

  for (const auto &MapFile : Opts.RewriteMapFiles)

    MapParser.parse(MapFile, &DL);

  MPM->add(createRewriteSymbolsPass(DL));

}

static CodeGenOpt::Level getCGOptLevel(const CodeGenOptions &CodeGenOpts) {

  switch (CodeGenOpts.OptimizationLevel) {

  default:

    llvm_unreachable("Invalid optimization level!");

  case 0:

    return CodeGenOpt::None;

  case 1:

    return CodeGenOpt::Less;

  case 2:

    return CodeGenOpt::Default; // O2/Os/Oz

  case 3:

    return CodeGenOpt::Aggressive;

  }

}

static Optional<llvm::CodeModel::Model>

getCodeModel(const CodeGenOptions &CodeGenOpts) {

  unsigned CodeModel = llvm::StringSwitch<unsigned>(CodeGenOpts.CodeModel)

                           .Case("tiny", llvm::CodeModel::Tiny)

                           .Case("small", llvm::CodeModel::Small)

                           .Case("kernel", llvm::CodeModel::Kernel)

                           .Case("medium", llvm::CodeModel::Medium)

                           .Case("large", llvm::CodeModel::Large)

                           .Case("default", ~1u)

                           .Default(~0u);

  assert(CodeModel != ~0u && "invalid code model!");

  if (CodeModel == ~1u)

    return None;

  return static_cast<llvm::CodeModel::Model>(CodeModel);

}

static CodeGenFileType getCodeGenFileType(BackendAction Action) {

  if (Action == Backend_EmitObj)

    return CGFT_ObjectFile;

  else if (Action == Backend_EmitMCNull)

    return CGFT_Null;

  else {

    assert(Action == Backend_EmitAssembly && "Invalid action!");

    return CGFT_AssemblyFile;

  }

}

static void initTargetOptions(DiagnosticsEngine &Diags,

                              llvm::TargetOptions &Options,

                              const CodeGenOptions &CodeGenOpts,

                              const clang::TargetOptions &TargetOpts,

                              const LangOptions &LangOpts,

                              const HeaderSearchOptions &HSOpts) {

  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 (LangOpts.getDefaultFPContractMode()) {

  case LangOptions::FPM_Off:

    // Preserve any contraction performed by the front-end.  (Strict performs

    // splitting of the muladd intrinsic in the backend.)

    Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;

    break;

  case LangOptions::FPM_On:

    Options.AllowFPOpFusion = llvm::FPOpFusion::Standard;

    break;

  case LangOptions::FPM_Fast:

    Options.AllowFPOpFusion = llvm::FPOpFusion::Fast;

    break;

  }

  Options.UseInitArray = CodeGenOpts.UseInitArray;

  Options.DisableIntegratedAS = CodeGenOpts.DisableIntegratedAS;

  Options.CompressDebugSections = CodeGenOpts.getCompressDebugSections();

  Options.RelaxELFRelocations = CodeGenOpts.RelaxELFRelocations;

  // Set EABI version.

  Options.EABIVersion = TargetOpts.EABIVersion;

  if (LangOpts.SjLjExceptions)

    Options.ExceptionModel = llvm::ExceptionHandling::SjLj;

  if (LangOpts.SEHExceptions)

    Options.ExceptionModel = llvm::ExceptionHandling::WinEH;

  if (LangOpts.DWARFExceptions)

    Options.ExceptionModel = llvm::ExceptionHandling::DwarfCFI;

  if (LangOpts.WasmExceptions)

    Options.ExceptionModel = llvm::ExceptionHandling::Wasm;

  Options.NoInfsFPMath = LangOpts.NoHonorInfs;

  Options.NoNaNsFPMath = LangOpts.NoHonorNaNs;

  Options.NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;

  Options.UnsafeFPMath = LangOpts.UnsafeFPMath;

  Options.StackAlignmentOverride = CodeGenOpts.StackAlignment;

  Options.BBSections =

      llvm::StringSwitch<llvm::BasicBlockSection>(CodeGenOpts.BBSections)

          .Case("all", llvm::BasicBlockSection::All)

          .Case("labels", llvm::BasicBlockSection::Labels)

          .StartsWith("list=", llvm::BasicBlockSection::List)

          .Case("none", llvm::BasicBlockSection::None)

          .Default(llvm::BasicBlockSection::None);

  if (Options.BBSections == llvm::BasicBlockSection::List) {

    ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =

        MemoryBuffer::getFile(CodeGenOpts.BBSections.substr(5));

    if (!MBOrErr)

      Diags.Report(diag::err_fe_unable_to_load_basic_block_sections_file)

          << MBOrErr.getError().message();

    else

      Options.BBSectionsFuncListBuf = std::move(*MBOrErr);

  }

  Options.EnableMachineFunctionSplitter = CodeGenOpts.SplitMachineFunctions;

  Options.FunctionSections = CodeGenOpts.FunctionSections;

  Options.DataSections = CodeGenOpts.DataSections;

  Options.UniqueSectionNames = CodeGenOpts.UniqueSectionNames;

  Options.UniqueBasicBlockSectionNames =

      CodeGenOpts.UniqueBasicBlockSectionNames;

  Options.TLSSize = CodeGenOpts.TLSSize;

  Options.EmulatedTLS = CodeGenOpts.EmulatedTLS;

  Options.ExplicitEmulatedTLS = CodeGenOpts.ExplicitEmulatedTLS;

  Options.DebuggerTuning = CodeGenOpts.getDebuggerTuning();

  Options.EmitStackSizeSection = CodeGenOpts.StackSizeSection;

  Options.EmitAddrsig = CodeGenOpts.Addrsig;

  Options.ForceDwarfFrameSection = CodeGenOpts.ForceDwarfFrameSection;

  Options.EmitCallSiteInfo = CodeGenOpts.EmitCallSiteInfo;

  Options.ValueTrackingVariableLocations =

      CodeGenOpts.ValueTrackingVariableLocations;

  Options.XRayOmitFunctionIndex = CodeGenOpts.XRayOmitFunctionIndex;

  Options.MCOptions.SplitDwarfFile = CodeGenOpts.SplitDwarfFile;

  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.MCNoWarn = CodeGenOpts.NoWarn;

  Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;

  Options.MCOptions.PreserveAsmComments = CodeGenOpts.PreserveAsmComments;

  Options.MCOptions.ABIName = TargetOpts.ABI;

  for (const auto &Entry : HSOpts.UserEntries)

    if (!Entry.IsFramework &&

        (Entry.Group == frontend::IncludeDirGroup::Quoted ||

         Entry.Group == frontend::IncludeDirGroup::Angled ||

         Entry.Group == frontend::IncludeDirGroup::System))

      Options.MCOptions.IASSearchPaths.push_back(

          Entry.IgnoreSysRoot ? Entry.Path : 
HSOpts.Sysroot + Entry.Path0
);

  Options.MCOptions.Argv0 = CodeGenOpts.Argv0;

  Options.MCOptions.CommandLineArgs = CodeGenOpts.CommandLineArgs;

}

static Optional<GCOVOptions> getGCOVOptions(const CodeGenOptions &CodeGenOpts,

                                            const LangOptions &LangOpts) {

  if (CodeGenOpts.DisableGCov)

    return None;

  if (!CodeGenOpts.EmitGcovArcs && 
!CodeGenOpts.EmitGcovNotes16.9k
)

    return None;

  // Not using 'GCOVOptions::getDefault' allows us to avoid exiting if

  // LLVM's -default-gcov-version flag is set to something invalid.

  GCOVOptions Options;

  Options.EmitNotes = CodeGenOpts.EmitGcovNotes;

  Options.EmitData = CodeGenOpts.EmitGcovArcs;

  llvm::copy(CodeGenOpts.CoverageVersion, std::begin(Options.Version));

  Options.NoRedZone = CodeGenOpts.DisableRedZone;

  Options.Filter = CodeGenOpts.ProfileFilterFiles;

  Options.Exclude = CodeGenOpts.ProfileExcludeFiles;

  Options.Atomic = LangOpts.Sanitize.has(SanitizerKind::Thread);

  return Options;

}

static Optional<InstrProfOptions>

getInstrProfOptions(const CodeGenOptions &CodeGenOpts,

                    const LangOptions &LangOpts) {

  if (!CodeGenOpts.hasProfileClangInstr())

    return None;

  InstrProfOptions Options;

  Options.NoRedZone = CodeGenOpts.DisableRedZone;

  Options.InstrProfileOutput = CodeGenOpts.InstrProfileOutput;

  // TODO: Surface the option to emit atomic profile counter increments at

  // the driver level.

  Options.Atomic = LangOpts.Sanitize.has(SanitizerKind::Thread);

  return Options;

}

void EmitAssemblyHelper::CreatePasses(legacy::PassManager &MPM,

                                      legacy::FunctionPassManager &FPM) {

  // Handle disabling of all LLVM passes, where we want to preserve the

  // internal module before any optimization.

  if (CodeGenOpts.DisableLLVMPasses)

    return;

  // Figure out TargetLibraryInfo.  This needs to be added to MPM and FPM

  // manually (and not via PMBuilder), since some passes (eg. InstrProfiling)

  // are inserted before PMBuilder ones - they'd get the default-constructed

  // TLI with an unknown target otherwise.

  Triple TargetTriple(TheModule->getTargetTriple());

  std::unique_ptr<TargetLibraryInfoImpl> TLII(

      createTLII(TargetTriple, CodeGenOpts));

  // If we reached here with a non-empty index file name, then the index file

  // was empty and we are not performing ThinLTO backend compilation (used in

  // testing in a distributed build environment). Drop any the type test

  // assume sequences inserted for whole program vtables so that codegen doesn't

  // complain.

  if (!CodeGenOpts.ThinLTOIndexFile.empty())

    MPM.add(createLowerTypeTestsPass(/*ExportSummary=*/nullptr,

                                     /*ImportSummary=*/nullptr,

                                     /*DropTypeTests=*/true));

  PassManagerBuilderWrapper PMBuilder(TargetTriple, CodeGenOpts, LangOpts);

  // At O0 and O1 we only run the always inliner which is more efficient. At

  // higher optimization levels we run the normal inliner.

  if (CodeGenOpts.OptimizationLevel <= 1) {

    bool InsertLifetimeIntrinsics = ((CodeGenOpts.OptimizationLevel != 0 &&

                                      !CodeGenOpts.DisableLifetimeMarkers) ||

                                     LangOpts.Coroutines);

    PMBuilder.Inliner = createAlwaysInlinerLegacyPass(InsertLifetimeIntrinsics);

  } else {

    // We do not want to inline hot callsites for SamplePGO module-summary build

    // because profile annotation will happen again in ThinLTO backend, and we

    // want the IR of the hot path to match the profile.

    PMBuilder.Inliner = createFunctionInliningPass(

        CodeGenOpts.OptimizationLevel, CodeGenOpts.OptimizeSize,

        (!CodeGenOpts.SampleProfileFile.empty() &&

         CodeGenOpts.PrepareForThinLTO));

  }

  PMBuilder.OptLevel = CodeGenOpts.OptimizationLevel;

  PMBuilder.SizeLevel = CodeGenOpts.OptimizeSize;

  PMBuilder.SLPVectorize = CodeGenOpts.VectorizeSLP;

  PMBuilder.LoopVectorize = CodeGenOpts.VectorizeLoop;

  // Only enable CGProfilePass when using integrated assembler, since

  // non-integrated assemblers don't recognize .cgprofile section.

  PMBuilder.CallGraphProfile = !CodeGenOpts.DisableIntegratedAS;

  PMBuilder.DisableUnrollLoops = !CodeGenOpts.UnrollLoops;

  // Loop interleaving in the loop vectorizer has historically been set to be

  // enabled when loop unrolling is enabled.

  PMBuilder.LoopsInterleaved = CodeGenOpts.UnrollLoops;

  PMBuilder.MergeFunctions = CodeGenOpts.MergeFunctions;

  PMBuilder.PrepareForThinLTO = CodeGenOpts.PrepareForThinLTO;

  PMBuilder.PrepareForLTO = CodeGenOpts.PrepareForLTO;

  PMBuilder.RerollLoops = CodeGenOpts.RerollLoops;

  MPM.add(new TargetLibraryInfoWrapperPass(*TLII));

  if (TM)

    TM->adjustPassManager(PMBuilder);

  if (CodeGenOpts.DebugInfoForProfiling ||

      !CodeGenOpts.SampleProfileFile.empty())

    PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,

                           addAddDiscriminatorsPass);

  // In ObjC ARC mode, add the main ARC optimization passes.

  if (LangOpts.ObjCAutoRefCount) {

    PMBuilder.addExtension(PassManagerBuilder::EP_EarlyAsPossible,

                           addObjCARCExpandPass);

    PMBuilder.addExtension(PassManagerBuilder::EP_ModuleOptimizerEarly,

                           addObjCARCAPElimPass);

    PMBuilder.addExtension(PassManagerBuilder::EP_ScalarOptimizerLate,

                           addObjCARCOptPass);

  }

  if (LangOpts.Coroutines)

    addCoroutinePassesToExtensionPoints(PMBuilder);

  if (CodeGenOpts.MemProf) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addMemProfilerPasses);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addMemProfilerPasses);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::LocalBounds)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_ScalarOptimizerLate,

                           addBoundsCheckingPass);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addBoundsCheckingPass);

  }

  if (CodeGenOpts.SanitizeCoverageType ||

      CodeGenOpts.SanitizeCoverageIndirectCalls ||

      CodeGenOpts.SanitizeCoverageTraceCmp) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addSanitizerCoveragePass);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addSanitizerCoveragePass);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::Address)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addAddressSanitizerPasses);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addAddressSanitizerPasses);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::KernelAddress)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addKernelAddressSanitizerPasses);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addKernelAddressSanitizerPasses);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::HWAddress)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addHWAddressSanitizerPasses);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addHWAddressSanitizerPasses);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::KernelHWAddress)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addKernelHWAddressSanitizerPasses);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addKernelHWAddressSanitizerPasses);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::Memory)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addMemorySanitizerPass);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addMemorySanitizerPass);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::KernelMemory)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addKernelMemorySanitizerPass);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addKernelMemorySanitizerPass);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::Thread)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addThreadSanitizerPass);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addThreadSanitizerPass);

  }

  if (LangOpts.Sanitize.has(SanitizerKind::DataFlow)) {

    PMBuilder.addExtension(PassManagerBuilder::EP_OptimizerLast,

                           addDataFlowSanitizerPass);

    PMBuilder.addExtension(PassManagerBuilder::EP_EnabledOnOptLevel0,

                           addDataFlowSanitizerPass);

  }

  // Set up the per-function pass manager.

  FPM.add(new TargetLibraryInfoWrapperPass(*TLII));

  if (CodeGenOpts.VerifyModule)

    FPM.add(createVerifierPass());

  // Set up the per-module pass manager.

  if (!CodeGenOpts.RewriteMapFiles.empty())

    addSymbolRewriterPass(CodeGenOpts, &MPM);

  // Add UniqueInternalLinkageNames Pass which renames internal linkage symbols

  // with unique names.

  if (CodeGenOpts.UniqueInternalLinkageNames) {

    MPM.add(createUniqueInternalLinkageNamesPass());

  }

  if (Optional<GCOVOptions> Options = getGCOVOptions(CodeGenOpts, LangOpts)) {

    MPM.add(createGCOVProfilerPass(*Options));

    if (CodeGenOpts.getDebugInfo() == codegenoptions::NoDebugInfo)

      MPM.add(createStripSymbolsPass(true));

  }

  if (Optional<InstrProfOptions> Options =

          getInstrProfOptions(CodeGenOpts, LangOpts))

    MPM.add(createInstrProfilingLegacyPass(*Options, false));

  bool hasIRInstr = false;

  if (CodeGenOpts.hasProfileIRInstr()) {

    PMBuilder.EnablePGOInstrGen = true;

    hasIRInstr = true;

  }

  if (CodeGenOpts.hasProfileCSIRInstr()) {

    assert(!CodeGenOpts.hasProfileCSIRUse() &&

           "Cannot have both CSProfileUse pass and CSProfileGen pass at the "

           "same time");

    assert(!hasIRInstr &&

           "Cannot have both ProfileGen pass and CSProfileGen pass at the "

           "same time");

    PMBuilder.EnablePGOCSInstrGen = true;

    hasIRInstr = true;

  }

  if (hasIRInstr) {

    if (!CodeGenOpts.InstrProfileOutput.empty())

      PMBuilder.PGOInstrGen = CodeGenOpts.InstrProfileOutput;

    else

      PMBuilder.PGOInstrGen = std::string(DefaultProfileGenName);

  }

  if (CodeGenOpts.hasProfileIRUse()) {

    PMBuilder.PGOInstrUse = CodeGenOpts.ProfileInstrumentUsePath;

    PMBuilder.EnablePGOCSInstrUse = CodeGenOpts.hasProfileCSIRUse();

  }

  if (!CodeGenOpts.SampleProfileFile.empty())

    PMBuilder.PGOSampleUse = CodeGenOpts.SampleProfileFile;

  PMBuilder.populateFunctionPassManager(FPM);

  PMBuilder.populateModulePassManager(MPM);

}

static void setCommandLineOpts(const CodeGenOptions &CodeGenOpts) {

  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());

  }

  BackendArgs.push_back(nullptr);

  llvm::cl::ParseCommandLineOptions(BackendArgs.size() - 1,

                                    BackendArgs.data());

}

void 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;

  }

  Optional<llvm::CodeModel::Model> CM = getCodeModel(CodeGenOpts);

  std::string FeaturesStr =

      llvm::join(TargetOpts.Features.begin(), TargetOpts.Features.end(), ",");

  llvm::Reloc::Model RM = CodeGenOpts.RelocationModel;

  CodeGenOpt::Level OptLevel = getCGOptLevel(CodeGenOpts);

  llvm::TargetOptions Options;

  initTargetOptions(Diags, Options, CodeGenOpts, TargetOpts, LangOpts, HSOpts);

  TM.reset(TheTarget->createTargetMachine(Triple, TargetOpts.CPU, FeaturesStr,

                                          Options, RM, CM, OptLevel));

}

bool EmitAssemblyHelper::AddEmitPasses(legacy::PassManager &CodeGenPasses,

                                       BackendAction Action,

                                       raw_pwrite_stream &OS,

                                       raw_pwrite_stream *DwoOS) {

  // Add LibraryInfo.

  llvm::Triple TargetTriple(TheModule->getTargetTriple());

  std::unique_ptr<TargetLibraryInfoImpl> TLII(

      createTLII(TargetTriple, CodeGenOpts));

  CodeGenPasses.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.

  CodeGenFileType CGFT = getCodeGenFileType(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)

    CodeGenPasses.add(createObjCARCContractPass());

  if (TM->addPassesToEmitFile(CodeGenPasses, OS, DwoOS, CGFT,

                              /*DisableVerify=*/!CodeGenOpts.VerifyModule)) {

    Diags.Report(diag::err_fe_unable_to_interface_with_target);

    return false;

  }

  return true;

}

void EmitAssemblyHelper::EmitAssembly(BackendAction Action,

                                      std::unique_ptr<raw_pwrite_stream> OS) {

  TimeRegion Region(FrontendTimesIsEnabled ? 
&CodeGenerationTime10
 : nullptr);

  setCommandLineOpts(CodeGenOpts);

  bool UsesCodeGen = (Action != Backend_EmitNothing &&

                      Action != Backend_EmitBC &&

                      Action != Backend_EmitLL);

  CreateTargetMachine(UsesCodeGen);

  if (UsesCodeGen && 
!TM4.05k
)

    return;

  if (TM)

    TheModule->setDataLayout(TM->createDataLayout());

  legacy::PassManager PerModulePasses;

  PerModulePasses.add(

      createTargetTransformInfoWrapperPass(getTargetIRAnalysis()));

  legacy::FunctionPassManager PerFunctionPasses(TheModule);

  PerFunctionPasses.add(

      createTargetTransformInfoWrapperPass(getTargetIRAnalysis()));

  CreatePasses(PerModulePasses, PerFunctionPasses);

  legacy::PassManager CodeGenPasses;

  CodeGenPasses.add(

      createTargetTransformInfoWrapperPass(getTargetIRAnalysis()));

  std::unique_ptr<llvm::ToolOutputFile> ThinLinkOS, DwoOS;

  switch (Action) {

  case Backend_EmitNothing:

    break;

  case Backend_EmitBC:

    if (CodeGenOpts.PrepareForThinLTO && 
!CodeGenOpts.DisableLLVMPasses25
) {

      if (!CodeGenOpts.ThinLinkBitcodeFile.empty()) {

        ThinLinkOS = openOutputFile(CodeGenOpts.ThinLinkBitcodeFile);

        if (!ThinLinkOS)

          return;

      }

      TheModule->addModuleFlag(Module::Error, "EnableSplitLTOUnit",

                               CodeGenOpts.EnableSplitLTOUnit);

      PerModulePasses.add(createWriteThinLTOBitcodePass(

          *OS, ThinLinkOS ? 
&ThinLinkOS->os()1
 : nullptr));

    } else {

      // Emit a module summary by default for Regular LTO except for ld64

      // targets

      bool EmitLTOSummary =

          (CodeGenOpts.PrepareForLTO &&

           !CodeGenOpts.DisableLLVMPasses &&

           llvm::Triple(TheModule->getTargetTriple()).getVendor() !=

               llvm::Triple::Apple);

      if (EmitLTOSummary) {

        if (!TheModule->getModuleFlag("ThinLTO"))

          TheModule->addModuleFlag(Module::Error, "ThinLTO", uint32_t(0));

        TheModule->addModuleFlag(Module::Error, "EnableSplitLTOUnit",

                                 uint32_t(1));

      }

      PerModulePasses.add(createBitcodeWriterPass(

          *OS, CodeGenOpts.EmitLLVMUseLists, EmitLTOSummary));

    }

    break;

  case Backend_EmitLL:

    PerModulePasses.add(

        createPrintModulePass(*OS, "", CodeGenOpts.EmitLLVMUseLists));

    break;

  default:

    if (!CodeGenOpts.SplitDwarfOutput.empty()) {

      DwoOS = openOutputFile(CodeGenOpts.SplitDwarfOutput);

      if (!DwoOS)

        return;

    }

    if (!AddEmitPasses(CodeGenPasses, Action, *OS,

                       DwoOS ? 
&DwoOS->os()6
 : nullptr))

      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.

  {

    PrettyStackTraceString CrashInfo("Per-function optimization");

    llvm::TimeTraceScope TimeScope("PerFunctionPasses");

    PerFunctionPasses.doInitialization();

    for (Function &F : *TheModule)

      if (!F.isDeclaration())

        PerFunctionPasses.run(F);

    PerFunctionPasses.doFinalization();

  }

  {

    PrettyStackTraceString CrashInfo("Per-module optimization passes");

    llvm::TimeTraceScope TimeScope("PerModulePasses");

    PerModulePasses.run(*TheModule);

  }

  {

    PrettyStackTraceString CrashInfo("Code generation");

    llvm::TimeTraceScope TimeScope("CodeGenPasses");

    CodeGenPasses.run(*TheModule);

  }

  if (ThinLinkOS)

    ThinLinkOS->keep();

  if (DwoOS)

    DwoOS->keep();

}

static PassBuilder::OptimizationLevel mapToLevel(const CodeGenOptions &Opts) {

  switch (Opts.OptimizationLevel) {

  default:

    llvm_unreachable("Invalid optimization level!");

  case 1:

    return PassBuilder::OptimizationLevel::O1;

  case 2:

    switch (Opts.OptimizeSize) {

    default:

      llvm_unreachable("Invalid optimization level for size!");

    case 0:

      return PassBuilder::OptimizationLevel::O2;

    case 1:

      return PassBuilder::OptimizationLevel::Os;

    case 2:

      return PassBuilder::OptimizationLevel::Oz;

    }

  case 3:

    return PassBuilder::OptimizationLevel::O3;

  }

}

static void addCoroutinePassesAtO0(ModulePassManager &MPM,

                                   const LangOptions &LangOpts,

                                   const CodeGenOptions &CodeGenOpts) {