C++ opt::append方法代码示例

int main(int argc, char **argv, char **envp) {
  // Print a stack trace if we signal out.
  sys::PrintStackTraceOnErrorSignal();
  PrettyStackTraceProgram X(argc, argv);

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

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

  // Initial global variable above for convenience printing of program name.
  progname = sys::path::stem(argv[0]);

  // Parse the command line options
  cl::ParseCommandLineOptions(argc, argv, "llvm linker\n");

#if defined(_WIN32) || defined(__CYGWIN__)
  if (!LinkAsLibrary) {
    // Default to "a.exe" instead of "a.out".
    if (OutputFilename.getNumOccurrences() == 0)
      OutputFilename = "a.exe";

    // If there is no suffix add an "exe" one.
    if (sys::path::extension(OutputFilename).empty())
      OutputFilename.append(".exe");
  }
#endif

  // Generate the bitcode for the optimized module.
  // If -b wasn't specified, use the name specified
  // with -o to construct BitcodeOutputFilename.
  if (BitcodeOutputFilename.empty()) {
    BitcodeOutputFilename = OutputFilename;
    if (!LinkAsLibrary) BitcodeOutputFilename += ".bc";
  }

  // Arrange for the bitcode output file to be deleted on any errors.
  BitcodeOutputRemover.setFile(BitcodeOutputFilename);
  sys::RemoveFileOnSignal(sys::Path(BitcodeOutputFilename));

  // Arrange for the output file to be deleted on any errors.
  if (!LinkAsLibrary) {
    OutputRemover.setFile(OutputFilename);
    sys::RemoveFileOnSignal(sys::Path(OutputFilename));
  }

  // Construct a Linker (now that Verbose is set)
  Linker TheLinker(progname, OutputFilename, Context, Verbose);

  // Keep track of the native link items (versus the bitcode items)
  Linker::ItemList NativeLinkItems;

  // Add library paths to the linker
  TheLinker.addPaths(LibPaths);
  TheLinker.addSystemPaths();

  // Remove any consecutive duplicates of the same library...
  Libraries.erase(std::unique(Libraries.begin(), Libraries.end()),
                  Libraries.end());

  if (LinkAsLibrary) {
    std::vector<sys::Path> Files;
    for (unsigned i = 0; i < InputFilenames.size(); ++i )
      Files.push_back(sys::Path(InputFilenames[i]));
    if (TheLinker.LinkInFiles(Files))
      return 1; // Error already printed

    // The libraries aren't linked in but are noted as "dependent" in the
    // module.
    for (cl::list<std::string>::const_iterator I = Libraries.begin(),
         E = Libraries.end(); I != E ; ++I) {
      TheLinker.getModule()->addLibrary(*I);
    }
  } else {
    // Build a list of the items from our command line
    Linker::ItemList Items;
    BuildLinkItems(Items, InputFilenames, Libraries);

    // Link all the items together
    if (TheLinker.LinkInItems(Items, NativeLinkItems) )
      return 1; // Error already printed
  }

  std::auto_ptr<Module> Composite(TheLinker.releaseModule());

  // Optimize the module
  Optimize(Composite.get());

  // Generate the bitcode output.
  GenerateBitcode(Composite.get(), BitcodeOutputFilename);

//.........这里部分代码省略.........