C++ TargetLibraryInfo::disableAllFunctions方法代码示例

static TargetLibraryInfo *createTLI(llvm::Triple &TargetTriple,
                                    const CodeGenOptions &CodeGenOpts) {
    TargetLibraryInfo *TLI = new TargetLibraryInfo(TargetTriple);
    if (!CodeGenOpts.SimplifyLibCalls)
        TLI->disableAllFunctions();
    return TLI;
}

void Optimize(llvm::Module *M, int OptLevel, int SizeLevel, int Verify) {

    // Create a PassManager to hold and optimize the collection of passes we are
    // about to build.
    //
    PassManager Passes;

    // Add an appropriate TargetLibraryInfo pass for the module's triple.
    TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));

    // The -disable-simplify-libcalls flag actually disables all builtin optzns.
    if (DisableSimplifyLibCalls)
      TLI->disableAllFunctions();
    Passes.add(TLI);

    // Add an appropriate DataLayout instance for this module.
    const DataLayout *DL = M->getDataLayout();
    if (DL)
      Passes.add(new DataLayoutPass());

    Triple ModuleTriple(M->getTargetTriple());
    TargetMachine *Machine = nullptr;
    if (ModuleTriple.getArch())
      Machine = GetTargetMachine(Triple(ModuleTriple), OptLevel);
    std::unique_ptr<TargetMachine> TM(Machine);

    // Add internal analysis passes from the target machine.
    if (TM.get())
      TM->addAnalysisPasses(Passes);

    std::unique_ptr<FunctionPassManager> FPasses;
    if (OptLevel > 0 || SizeLevel > 0) {
      FPasses.reset(new FunctionPassManager(M));
      if (DL)
        FPasses->add(new DataLayoutPass());
      if (TM.get())
        TM->addAnalysisPasses(*FPasses);

    }

    AddOptimizationPasses(Passes, *FPasses, OptLevel, SizeLevel);

    if (OptLevel > 0 || SizeLevel > 0) {
      FPasses->doInitialization();
      for (Module::iterator F = M->begin(), E = M->end(); F != E; ++F)
        FPasses->run(*F);
      FPasses->doFinalization();
    }

    // Check that the module is well formed on completion of optimization
    if (Verify) {
      Passes.add(createVerifierPass());
      Passes.add(createDebugInfoVerifierPass());
    }

    // Now that we have all of the passes ready, run them.
    Passes.run(*M);
}

  bool llvmToGen(ir::Unit &unit, const char *fileName, int optLevel)
  {
    // Get the global LLVM context
    llvm::LLVMContext& c = llvm::getGlobalContext();
    std::string errInfo;
    std::unique_ptr<llvm::raw_fd_ostream> o = NULL;
    if (OCL_OUTPUT_LLVM_BEFORE_EXTRA_PASS || OCL_OUTPUT_LLVM)
      o = std::unique_ptr<llvm::raw_fd_ostream>(new llvm::raw_fd_ostream(fileno(stdout), false));

    // Get the module from its file
    llvm::SMDiagnostic Err;
    std::auto_ptr<Module> M;
    M.reset(ParseIRFile(fileName, Err, c));
    if (M.get() == 0) return false;
    Module &mod = *M.get();

    Triple TargetTriple(mod.getTargetTriple());
    TargetLibraryInfo *libraryInfo = new TargetLibraryInfo(TargetTriple);
    libraryInfo->disableAllFunctions();

    runFuntionPass(mod, libraryInfo);
    runModulePass(mod, libraryInfo, optLevel);

    llvm::PassManager passes;

    // Print the code before further optimizations
    if (OCL_OUTPUT_LLVM_BEFORE_EXTRA_PASS)
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
      passes.add(createPrintModulePass(*o));
#else
      passes.add(createPrintModulePass(&*o));
#endif
    passes.add(createIntrinsicLoweringPass());
    passes.add(createFunctionInliningPass(200000));
    passes.add(createScalarReplAggregatesPass()); // Break up allocas
    passes.add(createRemoveGEPPass(unit));
    passes.add(createConstantPropagationPass());
    passes.add(createLowerSwitchPass());
    passes.add(createPromoteMemoryToRegisterPass());
    passes.add(createGVNPass());                  // Remove redundancies
    passes.add(createScalarizePass());        // Expand all vector ops
    passes.add(createDeadInstEliminationPass());  // Remove simplified instructions
    passes.add(createGenPass(unit));

    // Print the code extra optimization passes
    if (OCL_OUTPUT_LLVM)
#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >= 5
      passes.add(createPrintModulePass(*o));
#else
      passes.add(createPrintModulePass(&*o));
#endif
    passes.run(mod);

    return true;
  }

// Unfortunately, the LLVM C API doesn't provide a way to create the
// TargetLibraryInfo pass, so we use this method to do so.
extern "C" void
LLVMRustAddLibraryInfo(LLVMPassManagerRef PMB,
                       LLVMModuleRef M,
                       bool DisableSimplifyLibCalls) {
    Triple TargetTriple(unwrap(M)->getTargetTriple());
#if LLVM_VERSION_MINOR >= 7
    TargetLibraryInfoImpl TLII(TargetTriple);
    if (DisableSimplifyLibCalls)
      TLII.disableAllFunctions();
    unwrap(PMB)->add(new TargetLibraryInfoWrapperPass(TLII));
#else
    TargetLibraryInfo *TLI = new TargetLibraryInfo(TargetTriple);
    if (DisableSimplifyLibCalls)
      TLI->disableAllFunctions();
    unwrap(PMB)->add(TLI);
#endif
}

bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
                                       formatted_raw_ostream &OS,
                                       TargetMachine *TM) {

  // Create the code generator passes.
  PassManager *PM = getCodeGenPasses(TM);

  // Add LibraryInfo.
  llvm::Triple TargetTriple(TheModule->getTargetTriple());
  TargetLibraryInfo *TLI = new TargetLibraryInfo(TargetTriple);
  if (!CodeGenOpts.SimplifyLibCalls)
    TLI->disableAllFunctions();
  PM->add(TLI);

  // Add TargetTransformInfo.
  PM->add(new TargetTransformInfo(TM->getScalarTargetTransformInfo(),
                                  TM->getVectorTargetTransformInfo()));

  // 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 (LangOpts.ObjCAutoRefCount &&
      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;
}

//.........这里部分代码省略.........
      errs() << "WARNING: The -o (output filename) option is ignored when\n"
                "the --disable-output option is used.\n";
  } else {
    // Default to standard output.
    if (OutputFilename.empty())
      OutputFilename = "-";

    std::string ErrorInfo;
    Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
                                   raw_fd_ostream::F_Binary));
    if (!ErrorInfo.empty()) {
      errs() << ErrorInfo << '\n';
      return 1;
    }
  }

  // If the output is set to be emitted to standard out, and standard out is a
  // console, print out a warning message and refuse to do it.  We don't
  // impress anyone by spewing tons of binary goo to a terminal.
  if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
    if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
      NoOutput = true;

  // Create a PassManager to hold and optimize the collection of passes we are
  // about to build.
  //
  PassManager Passes;

  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (DisableSimplifyLibCalls)
    TLI->disableAllFunctions();
  Passes.add(TLI);

  // Add an appropriate DataLayout instance for this module.
  DataLayout *TD = 0;
  const std::string &ModuleDataLayout = M.get()->getDataLayout();
  if (!ModuleDataLayout.empty())
    TD = new DataLayout(ModuleDataLayout);
  else if (!DefaultDataLayout.empty())
    TD = new DataLayout(DefaultDataLayout);

  if (TD)
    Passes.add(TD);

  Triple ModuleTriple(M->getTargetTriple());
  TargetMachine *Machine = 0;
  if (ModuleTriple.getArch())
    Machine = GetTargetMachine(Triple(ModuleTriple));
  OwningPtr<TargetMachine> TM(Machine);

  // Add internal analysis passes from the target machine.
  if (TM.get())
    TM->addAnalysisPasses(Passes);

  OwningPtr<FunctionPassManager> FPasses;
  if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
    FPasses.reset(new FunctionPassManager(M.get()));
    if (TD)
      FPasses->add(new DataLayout(*TD));
  }

  if (PrintBreakpoints) {
    // Default to standard output.

//.........这里部分代码省略.........
    if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
      NoOutput = true;

  if (PassPipeline.getNumOccurrences() > 0) {
    OutputKind OK = OK_NoOutput;
    if (!NoOutput)
      OK = OutputAssembly ? OK_OutputAssembly : OK_OutputBitcode;

    VerifierKind VK = VK_VerifyInAndOut;
    if (NoVerify)
      VK = VK_NoVerifier;
    else if (VerifyEach)
      VK = VK_VerifyEachPass;

    // The user has asked to use the new pass manager and provided a pipeline
    // string. Hand off the rest of the functionality to the new code for that
    // layer.
    return runPassPipeline(argv[0], Context, *M, Out.get(), PassPipeline,
                           OK, VK)
               ? 0
               : 1;
  }

  // Create a PassManager to hold and optimize the collection of passes we are
  // about to build.
  //
  PassManager Passes;

  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (DisableSimplifyLibCalls)
    TLI->disableAllFunctions();
  Passes.add(TLI);

  // Add an appropriate DataLayout instance for this module.
  const DataLayout *DL = M->getDataLayout();
  if (!DL && !DefaultDataLayout.empty()) {
    M->setDataLayout(DefaultDataLayout);
    DL = M->getDataLayout();
  }

  if (DL)
    Passes.add(new DataLayoutPass());

  Triple ModuleTriple(M->getTargetTriple());
  TargetMachine *Machine = nullptr;
  if (ModuleTriple.getArch())
    Machine = GetTargetMachine(Triple(ModuleTriple));
  std::unique_ptr<TargetMachine> TM(Machine);

  // Add internal analysis passes from the target machine.
  if (TM)
    TM->addAnalysisPasses(Passes);

  std::unique_ptr<FunctionPassManager> FPasses;
  if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
    FPasses.reset(new FunctionPassManager(M.get()));
    if (DL)
      FPasses->add(new DataLayoutPass());
    if (TM)
      TM->addAnalysisPasses(*FPasses);

  }

//.........这里部分代码省略.........
                                          RelocModel, CMModel, OLvl));
  assert(target.get() && "Could not allocate target machine!");
  assert(mod && "Should have exited after outputting help!");
  TargetMachine &Target = *target.get();

  if (DisableDotLoc)
    Target.setMCUseLoc(false);

  if (DisableCFI)
    Target.setMCUseCFI(false);

  if (EnableDwarfDirectory)
    Target.setMCUseDwarfDirectory(true);

  if (GenerateSoftFloatCalls)
    FloatABIForCalls = FloatABI::Soft;

  // Disable .loc support for older OS X versions.
  if (TheTriple.isMacOSX() &&
      TheTriple.isMacOSXVersionLT(10, 6))
    Target.setMCUseLoc(false);

  // Figure out where we are going to send the output.
  OwningPtr<tool_output_file> Out
    (GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]));
  if (!Out) return 1;

  // Build up all of the passes that we want to do to the module.
  PassManager PM;

  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple);
  if (DisableSimplifyLibCalls)
    TLI->disableAllFunctions();
  PM.add(TLI);

  if (target.get()) {
    PM.add(createNoTTIPass(target->getScalarTargetTransformInfo(),
                           target->getVectorTargetTransformInfo()));
  }

  // Add the target data from the target machine, if it exists, or the module.
  if (const DataLayout *TD = Target.getDataLayout())
    PM.add(new DataLayout(*TD));
  else
    PM.add(new DataLayout(mod));

  // Override default to generate verbose assembly.
  Target.setAsmVerbosityDefault(true);

  if (RelaxAll) {
    if (FileType != TargetMachine::CGFT_ObjectFile)
      errs() << argv[0]
             << ": warning: ignoring -mc-relax-all because filetype != obj";
    else
      Target.setMCRelaxAll(true);
  }

  {
    formatted_raw_ostream FOS(Out->os());

    AnalysisID StartAfterID = 0;
    AnalysisID StopAfterID = 0;
    const PassRegistry *PR = PassRegistry::getPassRegistry();
    if (!StartAfter.empty()) {
      const PassInfo *PI = PR->getPassInfo(StartAfter);

//===----------------------------------------------------------------------===//
// main for opt
//
int main(int argc, char **argv) {
  sys::PrintStackTraceOnErrorSignal();
  llvm::PrettyStackTraceProgram X(argc, argv);

  // Enable debug stream buffering.
  EnableDebugBuffering = true;

  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
  LLVMContext &Context = getGlobalContext();

  // Initialize passes
  PassRegistry &Registry = *PassRegistry::getPassRegistry();
  initializeCore(Registry);
  initializeScalarOpts(Registry);
  initializeIPO(Registry);
  initializeAnalysis(Registry);
  initializeIPA(Registry);
  initializeTransformUtils(Registry);
  initializeInstCombine(Registry);
  initializeInstrumentation(Registry);
  initializeTarget(Registry);

  cl::ParseCommandLineOptions(argc, argv,
    "llvm .bc -> .bc modular optimizer and analysis printer\n");

  if (AnalyzeOnly && NoOutput) {
    errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
    return 1;
  }

  // Allocate a full target machine description only if necessary.
  // FIXME: The choice of target should be controllable on the command line.
  std::auto_ptr<TargetMachine> target;

  SMDiagnostic Err;

  // Load the input module...
  std::auto_ptr<Module> M;
  M.reset(ParseIRFile(InputFilename, Err, Context));

  if (M.get() == 0) {
    Err.Print(argv[0], errs());
    return 1;
  }

  // Figure out what stream we are supposed to write to...
  OwningPtr<tool_output_file> Out;
  if (NoOutput) {
    if (!OutputFilename.empty())
      errs() << "WARNING: The -o (output filename) option is ignored when\n"
                "the --disable-output option is used.\n";
  } else {
    // Default to standard output.
    if (OutputFilename.empty())
      OutputFilename = "-";

    std::string ErrorInfo;
    Out.reset(new tool_output_file(OutputFilename.c_str(), ErrorInfo,
                                   raw_fd_ostream::F_Binary));
    if (!ErrorInfo.empty()) {
      errs() << ErrorInfo << '\n';
      return 1;
    }
  }

  // If the output is set to be emitted to standard out, and standard out is a
  // console, print out a warning message and refuse to do it.  We don't
  // impress anyone by spewing tons of binary goo to a terminal.
  if (!Force && !NoOutput && !AnalyzeOnly && !OutputAssembly)
    if (CheckBitcodeOutputToConsole(Out->os(), !Quiet))
      NoOutput = true;

  // Create a PassManager to hold and optimize the collection of passes we are
  // about to build.
  //
  PassManager Passes;

  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *TLI = new TargetLibraryInfo(Triple(M->getTargetTriple()));

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (DisableSimplifyLibCalls)
    TLI->disableAllFunctions();
  Passes.add(TLI);

  // Add an appropriate TargetData instance for this module.
  TargetData *TD = 0;
  const std::string &ModuleDataLayout = M.get()->getDataLayout();
  if (!ModuleDataLayout.empty())
    TD = new TargetData(ModuleDataLayout);
  else if (!DefaultDataLayout.empty())
    TD = new TargetData(DefaultDataLayout);

  if (TD)
    Passes.add(TD);

  OwningPtr<FunctionPassManager> FPasses;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
  switch (OptLevel) {
  default:
    errs() << argv[0] << ": invalid optimization level.\n";
    return 1;
  case ' ': break;
  case '0': OLvl = CodeGenOpt::None; break;
  case '1': OLvl = CodeGenOpt::Less; break;
  case '2': OLvl = CodeGenOpt::Default; break;
  case '3': OLvl = CodeGenOpt::Aggressive; break;
  }

  TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
  Options.DisableIntegratedAS = NoIntegratedAssembler;
  Options.MCOptions.ShowMCEncoding = ShowMCEncoding;
  Options.MCOptions.MCUseDwarfDirectory = EnableDwarfDirectory;
  Options.MCOptions.AsmVerbose = AsmVerbose;

  std::unique_ptr<TargetMachine> target(
      TheTarget->createTargetMachine(TheTriple.getTriple(), MCPU, FeaturesStr,
                                     Options, RelocModel, CMModel, OLvl));
  assert(target.get() && "Could not allocate target machine!");

  // If we don't have a module then just exit now. We do this down
  // here since the CPU/Feature help is underneath the target machine
  // creation.
  if (SkipModule)
    return 0;

  assert(mod && "Should have exited if we didn't have a module!");
  TargetMachine &Target = *target.get();

  if (GenerateSoftFloatCalls)
    FloatABIForCalls = FloatABI::Soft;

  // Figure out where we are going to send the output.
  std::unique_ptr<tool_output_file> Out(
      GetOutputStream(TheTarget->getName(), TheTriple.getOS(), argv[0]));
  if (!Out) return 1;

  // Build up all of the passes that we want to do to the module.
  PassManager PM;

  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple);
  if (DisableSimplifyLibCalls)
    TLI->disableAllFunctions();
  PM.add(TLI);

  // Add the target data from the target machine, if it exists, or the module.
  if (const DataLayout *DL = Target.getSubtargetImpl()->getDataLayout())
    mod->setDataLayout(DL);
  PM.add(new DataLayoutPass(mod));

  if (RelaxAll.getNumOccurrences() > 0 &&
      FileType != TargetMachine::CGFT_ObjectFile)
    errs() << argv[0]
             << ": warning: ignoring -mc-relax-all because filetype != obj";

  {
    formatted_raw_ostream FOS(Out->os());

    AnalysisID StartAfterID = nullptr;
    AnalysisID StopAfterID = nullptr;
    const PassRegistry *PR = PassRegistry::getPassRegistry();
    if (!StartAfter.empty()) {
      const PassInfo *PI = PR->getPassInfo(StartAfter);
      if (!PI) {
        errs() << argv[0] << ": start-after pass is not registered.\n";
        return 1;
      }
      StartAfterID = PI->getTypeInfo();
    }
    if (!StopAfter.empty()) {
      const PassInfo *PI = PR->getPassInfo(StopAfter);
      if (!PI) {
        errs() << argv[0] << ": stop-after pass is not registered.\n";
        return 1;
      }
      StopAfterID = PI->getTypeInfo();
    }

    // Ask the target to add backend passes as necessary.
    if (Target.addPassesToEmitFile(PM, FOS, FileType, NoVerify,
                                   StartAfterID, StopAfterID)) {
      errs() << argv[0] << ": target does not support generation of this"
             << " file type!\n";
      return 1;
    }

    // Before executing passes, print the final values of the LLVM options.
    cl::PrintOptionValues();

    PM.run(*mod);
  }

  // Declare success.
  Out->keep();

  return 0;
}

//.........这里部分代码省略.........
    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;

  // Set frame pointer elimination mode.
  if (!CodeGenOpts.DisableFPElim) {
    Options.NoFramePointerElim = false;
    Options.NoFramePointerElimNonLeaf = false;
  } else if (CodeGenOpts.OmitLeafFramePointer) {
    Options.NoFramePointerElim = false;
    Options.NoFramePointerElimNonLeaf = true;
  } else {
    Options.NoFramePointerElim = true;
    Options.NoFramePointerElimNonLeaf = true;
  }

  if (CodeGenOpts.UseInitArray)
    Options.UseInitArray = true;

  // Set float ABI type.
  if (CodeGenOpts.FloatABI == "soft" || CodeGenOpts.FloatABI == "softfp")
    Options.FloatABIType = llvm::FloatABI::Soft;
  else if (CodeGenOpts.FloatABI == "hard")
    Options.FloatABIType = llvm::FloatABI::Hard;
  else {
    assert(CodeGenOpts.FloatABI.empty() && "Invalid float abi!");
    Options.FloatABIType = llvm::FloatABI::Default;
  }

  Options.LessPreciseFPMADOption = CodeGenOpts.LessPreciseFPMAD;
  Options.NoInfsFPMath = CodeGenOpts.NoInfsFPMath;
  Options.NoNaNsFPMath = CodeGenOpts.NoNaNsFPMath;
  Options.NoZerosInBSS = CodeGenOpts.NoZeroInitializedInBSS;
  Options.UnsafeFPMath = CodeGenOpts.UnsafeFPMath;
  Options.UseSoftFloat = CodeGenOpts.SoftFloat;
  Options.StackAlignmentOverride = CodeGenOpts.StackAlignment;
  Options.RealignStack = CodeGenOpts.StackRealignment;
  Options.DisableTailCalls = CodeGenOpts.DisableTailCalls;
  Options.TrapFuncName = CodeGenOpts.TrapFuncName;
  Options.PositionIndependentExecutable = LangOpts.PIELevel != 0;

  TargetMachine *TM = TheTarget->createTargetMachine(Triple, TargetOpts.CPU,
                                                     FeaturesStr, Options,
                                                     RM, CM, OptLevel);

  if (CodeGenOpts.RelaxAll)
    TM->setMCRelaxAll(true);
  if (CodeGenOpts.SaveTempLabels)
    TM->setMCSaveTempLabels(true);
  if (CodeGenOpts.NoDwarf2CFIAsm)
    TM->setMCUseCFI(false);
  if (!CodeGenOpts.NoDwarfDirectoryAsm)
    TM->setMCUseDwarfDirectory(true);
  if (CodeGenOpts.NoExecStack)
    TM->setMCNoExecStack(true);

  // Create the code generator passes.
  PassManager *PM = getCodeGenPasses();

  // Add LibraryInfo.
  TargetLibraryInfo *TLI = new TargetLibraryInfo();
  if (!CodeGenOpts.SimplifyLibCalls)
    TLI->disableAllFunctions();
  PM->add(TLI);

  // 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 (LangOpts.ObjCAutoRefCount &&
      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;
}

//////////////////////////////////////////////////////////////////////////////////////////
// This function runs optimization passes based on command line arguments.
// Returns true if any optimization passes were invoked.
bool ldc_optimize_module(llvm::Module *M)
{
    // Create a PassManager to hold and optimize the collection of
    // per-module passes we are about to build.
#if LDC_LLVM_VER >= 307
    legacy::
#endif
    PassManager mpm;

#if LDC_LLVM_VER >= 307
    // Add an appropriate TargetLibraryInfo pass for the module's triple.
    TargetLibraryInfoImpl *tlii = new TargetLibraryInfoImpl(Triple(M->getTargetTriple()));

    // The -disable-simplify-libcalls flag actually disables all builtin optzns.
    if (disableSimplifyLibCalls)
      tlii->disableAllFunctions();

    mpm.add(new TargetLibraryInfoWrapperPass(*tlii));
#else
    // Add an appropriate TargetLibraryInfo pass for the module's triple.
    TargetLibraryInfo *tli = new TargetLibraryInfo(Triple(M->getTargetTriple()));

    // The -disable-simplify-libcalls flag actually disables all builtin optzns.
    if (disableSimplifyLibCalls)
      tli->disableAllFunctions();

    mpm.add(tli);
#endif

    // Add an appropriate DataLayout instance for this module.
#if LDC_LLVM_VER >= 307
    // The DataLayout is already set at the module (in module.cpp,
    // method Module::genLLVMModule())
    // FIXME: Introduce new command line switch default-data-layout to
    // override the module data layout
#elif LDC_LLVM_VER == 306
    mpm.add(new DataLayoutPass());
#elif LDC_LLVM_VER == 305
    const DataLayout *DL = M->getDataLayout();
    assert(DL && "DataLayout not set at module");
    mpm.add(new DataLayoutPass(*DL));
#elif LDC_LLVM_VER >= 302
    mpm.add(new DataLayout(M));
#else
    mpm.add(new TargetData(M));
#endif

#if LDC_LLVM_VER >= 307
    // Add internal analysis passes from the target machine.
    mpm.add(createTargetTransformInfoWrapperPass(gTargetMachine->getTargetIRAnalysis()));
#elif LDC_LLVM_VER >= 305
    // Add internal analysis passes from the target machine.
    gTargetMachine->addAnalysisPasses(mpm);
#endif

    // Also set up a manager for the per-function passes.
#if LDC_LLVM_VER >= 307
    legacy::
#endif
    FunctionPassManager fpm(M);

#if LDC_LLVM_VER >= 307
    // Add internal analysis passes from the target machine.
    fpm.add(createTargetTransformInfoWrapperPass(gTargetMachine->getTargetIRAnalysis()));
#elif LDC_LLVM_VER >= 306
    fpm.add(new DataLayoutPass());
    gTargetMachine->addAnalysisPasses(fpm);
#elif LDC_LLVM_VER == 305
    fpm.add(new DataLayoutPass(M));
    gTargetMachine->addAnalysisPasses(fpm);
#elif LDC_LLVM_VER >= 302
    fpm.add(new DataLayout(M));
#else
    fpm.add(new TargetData(M));
#endif

    // If the -strip-debug command line option was specified, add it before
    // anything else.
    if (stripDebug)
        mpm.add(createStripSymbolsPass(true));

    bool defaultsAdded = false;
    // Create a new optimization pass for each one specified on the command line
    for (unsigned i = 0; i < passList.size(); ++i) {
        if (optimizeLevel && optimizeLevel.getPosition() < passList.getPosition(i)) {
            addOptimizationPasses(mpm, fpm, optLevel(), sizeLevel());
            defaultsAdded = true;
        }

        const PassInfo *passInf = passList[i];
        Pass *pass = 0;
        if (passInf->getNormalCtor())
            pass = passInf->getNormalCtor()();
        else {
            const char* arg = passInf->getPassArgument(); // may return null
            if (arg)
                error(Loc(), "Can't create pass '-%s' (%s)", arg, pass->getPassName());
//.........这里部分代码省略.........

////////////////////////////////////////////////////////////////////////////////
// This function runs optimization passes based on command line arguments.
// Returns true if any optimization passes were invoked.
bool ldc_optimize_module(llvm::Module *M) {
// Create a PassManager to hold and optimize the collection of
// per-module passes we are about to build.
#if LDC_LLVM_VER >= 307
  legacy::
#endif
      PassManager mpm;

#if LDC_LLVM_VER >= 307
  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfoImpl *tlii =
      new TargetLibraryInfoImpl(Triple(M->getTargetTriple()));

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (disableSimplifyLibCalls)
    tlii->disableAllFunctions();

  mpm.add(new TargetLibraryInfoWrapperPass(*tlii));
#else
  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *tli = new TargetLibraryInfo(Triple(M->getTargetTriple()));

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (disableSimplifyLibCalls) {
    tli->disableAllFunctions();
  }

  mpm.add(tli);
#endif

// Add an appropriate DataLayout instance for this module.
#if LDC_LLVM_VER >= 307
// The DataLayout is already set at the module (in module.cpp,
// method Module::genLLVMModule())
// FIXME: Introduce new command line switch default-data-layout to
// override the module data layout
#elif LDC_LLVM_VER == 306
  mpm.add(new DataLayoutPass());
#else
                                    const DataLayout *DL = M->getDataLayout();
                                    assert(DL &&
                                           "DataLayout not set at module");
                                    mpm.add(new DataLayoutPass(*DL));
#endif

#if LDC_LLVM_VER >= 307
  // Add internal analysis passes from the target machine.
  mpm.add(createTargetTransformInfoWrapperPass(
      gTargetMachine->getTargetIRAnalysis()));
#else
  // Add internal analysis passes from the target machine.
  gTargetMachine->addAnalysisPasses(mpm);
#endif

// Also set up a manager for the per-function passes.
#if LDC_LLVM_VER >= 307
  legacy::
#endif
      FunctionPassManager fpm(M);

#if LDC_LLVM_VER >= 307
  // Add internal analysis passes from the target machine.
  fpm.add(createTargetTransformInfoWrapperPass(
      gTargetMachine->getTargetIRAnalysis()));
#elif LDC_LLVM_VER >= 306
  fpm.add(new DataLayoutPass());
  gTargetMachine->addAnalysisPasses(fpm);
#else
                                    fpm.add(new DataLayoutPass(M));
                                    gTargetMachine->addAnalysisPasses(fpm);
#endif

  // If the -strip-debug command line option was specified, add it before
  // anything else.
  if (stripDebug) {
    mpm.add(createStripSymbolsPass(true));
  }

  addOptimizationPasses(mpm, fpm, optLevel(), sizeLevel());

  // Run per-function passes.
  fpm.doInitialization();
  for (auto &F : *M) {
    fpm.run(F);
  }
  fpm.doFinalization();

  // Run per-module passes.
  mpm.run(*M);

  // Verify the resulting module.
  verifyModule(M);

  // Report that we run some passes.
  return true;
}

//////////////////////////////////////////////////////////////////////////////////////////
// This function runs optimization passes based on command line arguments.
// Returns true if any optimization passes were invoked.
bool ldc_optimize_module(llvm::Module* m)
{
    // Create a PassManager to hold and optimize the collection of
    // per-module passes we are about to build.
    PassManager mpm;

    // Add an appropriate TargetLibraryInfo pass for the module's triple.
    TargetLibraryInfo *tli = new TargetLibraryInfo(Triple(m->getTargetTriple()));

    // The -disable-simplify-libcalls flag actually disables all builtin optzns.
    if (disableSimplifyLibCalls)
        tli->disableAllFunctions();
    mpm.add(tli);

    // Add an appropriate TargetData instance for this module.
#if LDC_LLVM_VER >= 302
    mpm.add(new DataLayout(m));
#else
    mpm.add(new TargetData(m));
#endif

    // Also set up a manager for the per-function passes.
    FunctionPassManager fpm(m);
#if LDC_LLVM_VER >= 302
    fpm.add(new DataLayout(m));
#else
    fpm.add(new TargetData(m));
#endif

    // If the -strip-debug command line option was specified, add it before
    // anything else.
    if (stripDebug)
        mpm.add(createStripSymbolsPass(true));

    bool defaultsAdded = false;
    // Create a new optimization pass for each one specified on the command line
    for (unsigned i = 0; i < passList.size(); ++i) {
        if (optimizeLevel && optimizeLevel.getPosition() < passList.getPosition(i)) {
            addOptimizationPasses(mpm, fpm, optLevel(), sizeLevel());
            defaultsAdded = true;
        }

        const PassInfo *passInf = passList[i];
        Pass *pass = 0;
        if (passInf->getNormalCtor())
            pass = passInf->getNormalCtor()();
        else {
            const char* arg = passInf->getPassArgument(); // may return null
            if (arg)
                error("Can't create pass '-%s' (%s)", arg, pass->getPassName());
            else
                error("Can't create pass (%s)", pass->getPassName());
            llvm_unreachable("pass creation failed");
        }
        if (pass) {
            addPass(mpm, pass);
        }
    }

    // Add the default passes for the specified optimization level.
    if (!defaultsAdded)
        addOptimizationPasses(mpm, fpm, optLevel(), sizeLevel());

    // Run per-function passes.
    fpm.doInitialization();
    for (llvm::Module::iterator F = m->begin(), E = m->end(); F != E; ++F)
        fpm.run(*F);
    fpm.doFinalization();

    // Run per-module passes.
    mpm.run(*m);

    // Verify the resulting module.
    verifyModule(m);

    // Report that we run some passes.
    return true;
}

// The following function is adapted from llc.cpp
int CompileModule(Module *mod, raw_string_ostream &os, bool emitBRIG,
                  int OptLevel) {
  // Load the module to be compiled...
  SMDiagnostic Err;

  Triple TheTriple;

  TheTriple = Triple(mod->getTargetTriple());

  if (TheTriple.getTriple().empty())
    TheTriple.setTriple(sys::getDefaultTargetTriple());

  // Get the target specific parser.
  std::string Error;
  const Target *TheTarget = TargetRegistry::lookupTarget(MArch, TheTriple,
                                                         Error);
  if (!TheTarget) {
    errs() << Error;
    return 0;
  }

  // Package up features to be passed to target/subtarget
  std::string FeaturesStr;

  CodeGenOpt::Level OLvl = CodeGenOpt::Default;

  switch (OptLevel) {
  case 0: OLvl = CodeGenOpt::None; break;
  case 1: OLvl = CodeGenOpt::Less; break;
  case 2: OLvl = CodeGenOpt::Default; break;
  case 3: OLvl = CodeGenOpt::Aggressive; break;
  }

  TargetOptions Options;

  std::unique_ptr<TargetMachine> target(
      TheTarget->createTargetMachine(TheTriple.getTriple(), MCPU, FeaturesStr,
                                     Options, RelocModel, CMModel, OLvl));
  assert(target.get() && "Could not allocate target machine!");
  assert(mod && "Should have exited if we didn't have a module!");
  TargetMachine &Target = *target.get();

  if (GenerateSoftFloatCalls)
    FloatABIForCalls = FloatABI::Soft;

  // Build up all of the passes that we want to do to the module.
  PassManager PM;

  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *TLI = new TargetLibraryInfo(TheTriple);
  if (DisableSimplifyLibCalls)
    TLI->disableAllFunctions();
  PM.add(TLI);

  // Add the target data from the target machine, if it exists, or the module.
  if (const DataLayout *DL = Target.getSubtargetImpl()->getDataLayout())
    mod->setDataLayout(DL);
  PM.add(new DataLayoutPass());

  auto FileType = (emitBRIG
                   ? TargetMachine::CGFT_ObjectFile
                   : TargetMachine::CGFT_AssemblyFile);

  formatted_raw_ostream FOS(os);

  // Ask the target to add backend passes as necessary.
  bool Verify = false;
  if (Target.addPassesToEmitFile(PM, FOS, FileType, Verify)) {
    errs() << "target does not support generation of this"
           << " file type!\n";
    return 0;
  }

  PM.run(*mod);

  return 1;
}