C++ list::getPosition方法代码示例

// BuildLinkItems -- This function generates a LinkItemList for the LinkItems
// linker function by combining the Files and Libraries in the order they were
// declared on the command line.
static void BuildLinkItems(
  Linker::ItemList& Items,
  const cl::list<std::string>& Files,
  const cl::list<std::string>& Libraries) {

  // Build the list of linkage items for LinkItems.

  cl::list<std::string>::const_iterator fileIt = Files.begin();
  cl::list<std::string>::const_iterator libIt  = Libraries.begin();

  int libPos = -1, filePos = -1;
  while ( libIt != Libraries.end() || fileIt != Files.end() ) {
    if (libIt != Libraries.end())
      libPos = Libraries.getPosition(libIt - Libraries.begin());
    else
      libPos = -1;
    if (fileIt != Files.end())
      filePos = Files.getPosition(fileIt - Files.begin());
    else
      filePos = -1;

    if (filePos != -1 && (libPos == -1 || filePos < libPos)) {
      // Add a source file
      Items.push_back(std::make_pair(*fileIt++, false));
    } else if (libPos != -1 && (filePos == -1 || libPos < filePos)) {
      // Add a library
      Items.push_back(std::make_pair(*libIt++, true));
    }
  }
}

// Helper function used by Build().
// Traverses initial portions of the toolchains (up to the first Join node).
// This function is also responsible for handling the -x option.
void CompilationGraph::BuildInitial (InputLanguagesSet& InLangs,
                                     const sys::Path& TempDir) {
    // This is related to -x option handling.
    cl::list<std::string>::const_iterator xIter = Languages.begin(),
                                          xBegin = xIter, xEnd = Languages.end();
    bool xEmpty = true;
    const std::string* xLanguage = 0;
    unsigned xPos = 0, xPosNext = 0, filePos = 0;

    if (xIter != xEnd) {
        xEmpty = false;
        xPos = Languages.getPosition(xIter - xBegin);
        cl::list<std::string>::const_iterator xNext = llvm::next(xIter);
        xPosNext = (xNext == xEnd) ? std::numeric_limits<unsigned>::max()
                   : Languages.getPosition(xNext - xBegin);
        xLanguage = (*xIter == "none") ? 0 : &(*xIter);
    }

    // For each input file:
    for (cl::list<std::string>::const_iterator B = InputFilenames.begin(),
            CB = B, E = InputFilenames.end(); B != E; ++B) {
        sys::Path In = sys::Path(*B);

        // Code for handling the -x option.
        // Output: std::string* xLanguage (can be NULL).
        if (!xEmpty) {
            filePos = InputFilenames.getPosition(B - CB);

            if (xPos < filePos) {
                if (filePos < xPosNext) {
                    xLanguage = (*xIter == "none") ? 0 : &(*xIter);
                }
                else { // filePos >= xPosNext
                    // Skip xIters while filePos > xPosNext
                    while (filePos > xPosNext) {
                        ++xIter;
                        xPos = xPosNext;

                        cl::list<std::string>::const_iterator xNext = llvm::next(xIter);
                        if (xNext == xEnd)
                            xPosNext = std::numeric_limits<unsigned>::max();
                        else
                            xPosNext = Languages.getPosition(xNext - xBegin);
                        xLanguage = (*xIter == "none") ? 0 : &(*xIter);
                    }
                }
            }
        }

        // Find the toolchain corresponding to this file.
        const Node* N = FindToolChain(In, xLanguage, InLangs);
        // Pass file through the chain starting at head.
        PassThroughGraph(In, N, InLangs, TempDir);
    }
}

//////////////////////////////////////////////////////////////////////////////////////////
// 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)
{
    if (!optimize())
        return false;

    PassManager pm;

    if (verifyEach) pm.add(createVerifierPass());

#if LDC_LLVM_VER >= 302
    addPass(pm, new DataLayout(m));
#else
    addPass(pm, new TargetData(m));
#endif

    bool optimize = optimizeLevel != 0 || doInline();

    unsigned optPos = optimizeLevel != 0
                    ? optimizeLevel.getPosition()
                    : enableInlining.getPosition();

    for (size_t i = 0; i < passList.size(); i++) {
        // insert -O<N> / -enable-inlining in right position
        if (optimize && optPos < passList.getPosition(i)) {
            addPassesForOptLevel(pm);
            optimize = false;
        }

        const PassInfo* pass = passList[i];
        if (PassInfo::NormalCtor_t ctor = pass->getNormalCtor()) {
            addPass(pm, ctor());
        } else {
            const char* arg = pass->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());
            assert(0);  // Should be unreachable; root.h:error() calls exit()
        }
    }
    // insert -O<N> / -enable-inlining if specified at the end,
    if (optimize)
        addPassesForOptLevel(pm);

    pm.run(*m);

    verifyModule(m);

    return true;
}

//.........这里部分代码省略.........
    FPasses.reset(new FunctionPassManager(M.get()));
    if (TD)
      FPasses->add(new DataLayout(*TD));
  }

  if (PrintBreakpoints) {
    // Default to standard output.
    if (!Out) {
      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;
      }
    }
    Passes.add(new BreakpointPrinter(Out->os()));
    NoOutput = true;
  }

  // If the -strip-debug command line option was specified, add it.  If
  // -std-compile-opts was also specified, it will handle StripDebug.
  if (StripDebug && !StandardCompileOpts)
    addPass(Passes, createStripSymbolsPass(true));

  // Create a new optimization pass for each one specified on the command line
  for (unsigned i = 0; i < PassList.size(); ++i) {
    // Check to see if -std-compile-opts was specified before this option.  If
    // so, handle it.
    if (StandardCompileOpts &&
        StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardCompilePasses(Passes);
      StandardCompileOpts = false;
    }

    if (StandardLinkOpts &&
        StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardLinkPasses(Passes);
      StandardLinkOpts = false;
    }

    if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 1, 0);
      OptLevelO1 = false;
    }

    if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 0);
      OptLevelO2 = false;
    }

    if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 1);
      OptLevelOs = false;
    }

    if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 2);
      OptLevelOz = false;
    }

    if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 3, 0);

//.........这里部分代码省略.........
    FPasses.reset(new FunctionPassManager(M.get()));
    if (DL)
      FPasses->add(new DataLayoutPass());
    if (TM)
      TM->addAnalysisPasses(*FPasses);

  }

  if (PrintBreakpoints) {
    // Default to standard output.
    if (!Out) {
      if (OutputFilename.empty())
        OutputFilename = "-";

      std::error_code EC;
      Out = llvm::make_unique<tool_output_file>(OutputFilename, EC,
                                                sys::fs::F_None);
      if (EC) {
        errs() << EC.message() << '\n';
        return 1;
      }
    }
    Passes.add(createBreakpointPrinter(Out->os()));
    NoOutput = true;
  }

  // If the -strip-debug command line option was specified, add it.
  if (StripDebug)
    addPass(Passes, createStripSymbolsPass(true));

  // Create a new optimization pass for each one specified on the command line
  for (unsigned i = 0; i < PassList.size(); ++i) {
    if (StandardLinkOpts &&
        StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardLinkPasses(Passes);
      StandardLinkOpts = false;
    }

    if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 1, 0);
      OptLevelO1 = false;
    }

    if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 0);
      OptLevelO2 = false;
    }

    if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 1);
      OptLevelOs = false;
    }

    if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 2);
      OptLevelOz = false;
    }

    if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 3, 0);
      OptLevelO3 = false;
    }

    const PassInfo *PassInf = PassList[i];
    Pass *P = nullptr;
    if (PassInf->getTargetMachineCtor())

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

  if (AnalyzeOnly && NoOutput) {
    errs() << argv[0] << ": analyze mode conflicts with no-output mode.\n";
    return 1;
  }
  
  // Enable debug stream buffering.
  EnableDebugBuffering = true;

  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
  LLVMContext &Context = getGlobalContext();
  
  cl::ParseCommandLineOptions(argc, argv,
    "llvm .bc -> .bc modular optimizer and analysis printer\n");

  // 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 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<PassManager> FPasses;
  if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
    FPasses.reset(new PassManager());
    if (TD)
      FPasses->add(new TargetData(*TD));
  }

  // If the -strip-debug command line option was specified, add it.  If
  // -std-compile-opts was also specified, it will handle StripDebug.
  if (StripDebug && !StandardCompileOpts)
    addPass(Passes, createStripSymbolsPass(true));

  // Create a new optimization pass for each one specified on the command line
  for (unsigned i = 0; i < PassList.size(); ++i) {
    // Check to see if -std-compile-opts was specified before this option.  If
    // so, handle it.
    if (StandardCompileOpts &&
        StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardCompilePasses(Passes);
      StandardCompileOpts = false;
    }
//.........这里部分代码省略.........

//.........这里部分代码省略.........

  // Add internal analysis passes from the target machine.
  Passes.add(createTargetTransformInfoWrapperPass(TM ? TM->getTargetIRAnalysis()
                                                     : TargetIRAnalysis()));

  std::unique_ptr<legacy::FunctionPassManager> FPasses;
  if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
    FPasses.reset(new legacy::FunctionPassManager(M.get()));
    FPasses->add(createTargetTransformInfoWrapperPass(
        TM ? TM->getTargetIRAnalysis() : TargetIRAnalysis()));
  }

  if (PrintBreakpoints) {
    // Default to standard output.
    if (!Out) {
      if (OutputFilename.empty())
        OutputFilename = "-";

      std::error_code EC;
      Out = llvm::make_unique<tool_output_file>(OutputFilename, EC,
                                                sys::fs::F_None);
      if (EC) {
        errs() << EC.message() << '\n';
        return 1;
      }
    }
    Passes.add(createBreakpointPrinter(Out->os()));
    NoOutput = true;
  }

  // Create a new optimization pass for each one specified on the command line
  for (unsigned i = 0; i < PassList.size(); ++i) {
    if (StandardLinkOpts &&
        StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardLinkPasses(Passes);
      StandardLinkOpts = false;
    }

    if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 1, 0);
      OptLevelO1 = false;
    }

    if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 0);
      OptLevelO2 = false;
    }

    if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 1);
      OptLevelOs = false;
    }

    if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 2);
      OptLevelOz = false;
    }

    if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 3, 0);
      OptLevelO3 = false;
    }

    const PassInfo *PassInf = PassList[i];
    Pass *P = nullptr;
    if (PassInf->getTargetMachineCtor())

//////////////////////////////////////////////////////////////////////////////////////////
// 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.........

//.........这里部分代码省略.........
  // Add internal analysis passes from the target machine.
  Passes.add(createTargetTransformInfoWrapperPass(TM ? TM->getTargetIRAnalysis()
                                                     : TargetIRAnalysis()));

  std::unique_ptr<legacy::FunctionPassManager> FPasses;
  if (OptLevelO1 || OptLevelO2 || OptLevelOs || OptLevelOz || OptLevelO3) {
    FPasses.reset(new legacy::FunctionPassManager(M.get()));
    FPasses->add(createTargetTransformInfoWrapperPass(
        TM ? TM->getTargetIRAnalysis() : TargetIRAnalysis()));
  }

  if (PrintBreakpoints) {
    // Default to standard output.
    if (!Out) {
      if (OutputFilename.empty())
        OutputFilename = "-";

      std::error_code EC;
      Out = llvm::make_unique<tool_output_file>(OutputFilename, EC,
                                                sys::fs::F_None);
      if (EC) {
        errs() << EC.message() << '\n';
        return 1;
      }
    }
    Passes.add(createBreakpointPrinter(Out->os()));
    NoOutput = true;
  }

  // Create a new optimization pass for each one specified on the command line
  for (unsigned i = 0; i < PassList.size(); ++i) {
    // @LOCALMOD-BEGIN
    if (PNaClABISimplifyPreOpt &&
        PNaClABISimplifyPreOpt.getPosition() < PassList.getPosition(i)) {
      PNaClABISimplifyAddPreOptPasses(&ModuleTriple, Passes);
      PNaClABISimplifyPreOpt = false;
    }
    // @LOCALMOD-END

    if (StandardLinkOpts &&
        StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardLinkPasses(Passes);
      StandardLinkOpts = false;
    }

    if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 1, 0);
      OptLevelO1 = false;
    }

    if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 0);
      OptLevelO2 = false;
    }

    if (OptLevelOs && OptLevelOs.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 1);
      OptLevelOs = false;
    }

    if (OptLevelOz && OptLevelOz.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 2, 2);
      OptLevelOz = false;
    }

    if (OptLevelO3 && OptLevelO3.getPosition() < PassList.getPosition(i)) {

//////////////////////////////////////////////////////////////////////////////////////////
// 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;
}

//===----------------------------------------------------------------------===//
// main for opt
//
int main(int argc, char **argv) {
  sys::PrintStackTraceOnErrorSignal();
  llvm::PrettyStackTraceProgram X(argc, argv);
  
  llvm_shutdown_obj Y;  // Call llvm_shutdown() on exit.
  LLVMContext &Context = getGlobalContext();
  
  cl::ParseCommandLineOptions(argc, argv,
    "llvm .bc -> .bc modular optimizer and analysis printer\n");

  // 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...
  // FIXME: outs() is not binary!
  raw_ostream *Out = &outs();  // Default to printing to stdout...
  if (OutputFilename != "-") {
    // Make sure that the Output file gets unlinked from the disk if we get a
    // SIGINT
    sys::RemoveFileOnSignal(sys::Path(OutputFilename));

    std::string ErrorInfo;
    Out = new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo,
                             raw_fd_ostream::F_Binary);
    if (!ErrorInfo.empty()) {
      errs() << ErrorInfo << '\n';
      delete Out;
      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 && !OutputAssembly)
    if (CheckBitcodeOutputToConsole(*Out, !Quiet))
      NoOutput = true;

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

  // 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);

  FunctionPassManager *FPasses = NULL;
  if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
    FPasses = new FunctionPassManager(new ExistingModuleProvider(M.get()));
    if (TD)
      FPasses->add(new TargetData(*TD));
  }

  // If the -strip-debug command line option was specified, add it.  If
  // -std-compile-opts was also specified, it will handle StripDebug.
  if (StripDebug && !StandardCompileOpts)
    addPass(Passes, createStripSymbolsPass(true));

  // Create a new optimization pass for each one specified on the command line
  for (unsigned i = 0; i < PassList.size(); ++i) {
    // Check to see if -std-compile-opts was specified before this option.  If
    // so, handle it.
    if (StandardCompileOpts &&
        StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardCompilePasses(Passes);
      StandardCompileOpts = false;
    }

    if (StandardLinkOpts &&
        StandardLinkOpts.getPosition() < PassList.getPosition(i)) {
      AddStandardLinkPasses(Passes);
      StandardLinkOpts = false;
    }

    if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
      AddOptimizationPasses(Passes, *FPasses, 1);
      OptLevelO1 = false;
//.........这里部分代码省略.........

//===----------------------------------------------------------------------===//
// main for opt
//
int main(int argc, char **argv) {
    llvm_shutdown_obj X;  // Call llvm_shutdown() on exit.
    try {
        cl::ParseCommandLineOptions(argc, argv,
                                    "llvm .bc -> .bc modular optimizer and analysis printer\n");
        sys::PrintStackTraceOnErrorSignal();

        // 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;

        std::string ErrorMessage;

        // Load the input module...
        std::auto_ptr<Module> M;
        if (MemoryBuffer *Buffer
                = MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage)) {
            M.reset(ParseBitcodeFile(Buffer, &ErrorMessage));
            delete Buffer;
        }

        if (M.get() == 0) {
            cerr << argv[0] << ": ";
            if (ErrorMessage.size())
                cerr << ErrorMessage << "\n";
            else
                cerr << "bitcode didn't read correctly.\n";
            return 1;
        }

        // Figure out what stream we are supposed to write to...
        // FIXME: cout is not binary!
        std::ostream *Out = &std::cout;  // Default to printing to stdout...
        if (OutputFilename != "-") {
            if (!Force && std::ifstream(OutputFilename.c_str())) {
                // If force is not specified, make sure not to overwrite a file!
                cerr << argv[0] << ": error opening '" << OutputFilename
                     << "': file exists!\n"
                     << "Use -f command line argument to force output\n";
                return 1;
            }
            std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
                                         std::ios::binary;
            Out = new std::ofstream(OutputFilename.c_str(), io_mode);

            if (!Out->good()) {
                cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
                return 1;
            }

            // Make sure that the Output file gets unlinked from the disk if we get a
            // SIGINT
            sys::RemoveFileOnSignal(sys::Path(OutputFilename));
        }

        // 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 && CheckBitcodeOutputToConsole(Out,!Quiet)) {
            NoOutput = true;
        }

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

        // Add an appropriate TargetData instance for this module...
        Passes.add(new TargetData(M.get()));

        FunctionPassManager *FPasses = NULL;
        if (OptLevelO1 || OptLevelO2 || OptLevelO3) {
            FPasses = new FunctionPassManager(new ExistingModuleProvider(M.get()));
            FPasses->add(new TargetData(M.get()));
        }

        // If the -strip-debug command line option was specified, add it.  If
        // -std-compile-opts was also specified, it will handle StripDebug.
        if (StripDebug && !StandardCompileOpts)
            addPass(Passes, createStripSymbolsPass(true));

        // Create a new optimization pass for each one specified on the command line
        for (unsigned i = 0; i < PassList.size(); ++i) {
            // Check to see if -std-compile-opts was specified before this option.  If
            // so, handle it.
            if (StandardCompileOpts &&
                    StandardCompileOpts.getPosition() < PassList.getPosition(i)) {
                AddStandardCompilePasses(Passes);
                StandardCompileOpts = false;
            }

            if (OptLevelO1 && OptLevelO1.getPosition() < PassList.getPosition(i)) {
                AddOptimizationPasses(Passes, *FPasses, 1);
                OptLevelO1 = false;
            }

            if (OptLevelO2 && OptLevelO2.getPosition() < PassList.getPosition(i)) {
//.........这里部分代码省略.........