C++ Path::str方法代码示例

// LoadObject - Read in and parse the bitcode file named by FN and return the
// module it contains (wrapped in an auto_ptr), or auto_ptr<Module>() and set
// Error if an error occurs.
std::auto_ptr<Module>
Linker::LoadObject(const sys::Path &FN) {
  std::string ParseErrorMessage;
  Module *Result = 0;

  OwningPtr<MemoryBuffer> Buffer;
  if (error_code ec = MemoryBuffer::getFileOrSTDIN(FN.c_str(), Buffer))
    ParseErrorMessage = "Error reading file '" + FN.str() + "'" + ": "
                      + ec.message();
  else
    Result = ParseBitcodeFile(Buffer.get(), Context, &ParseErrorMessage);

  if (Result)
    return std::auto_ptr<Module>(Result);
  Error = "Bitcode file '" + FN.str() + "' could not be loaded";
  if (ParseErrorMessage.size())
    Error += ": " + ParseErrorMessage;
  return std::auto_ptr<Module>();
}

// Insert a file into the archive before some other member. This also takes care
// of extracting the necessary flags and information from the file.
bool
Archive::addFileBefore(const sys::Path& filePath, iterator where,
                        std::string* ErrMsg) {
  bool Exists;
  if (sys::fs::exists(filePath.str(), Exists) || !Exists) {
    if (ErrMsg)
      *ErrMsg = "Can not add a non-existent file to archive";
    return true;
  }

  ArchiveMember* mbr = new ArchiveMember(this);

  mbr->data = 0;
  mbr->path = filePath;
  const sys::FileStatus *FSInfo = mbr->path.getFileStatus(false, ErrMsg);
  if (!FSInfo) {
    delete mbr;
    return true;
  }
  mbr->info = *FSInfo;

  unsigned flags = 0;
  bool hasSlash = filePath.str().find('/') != std::string::npos;
  if (hasSlash)
    flags |= ArchiveMember::HasPathFlag;
  if (hasSlash || filePath.str().length() > 15)
    flags |= ArchiveMember::HasLongFilenameFlag;

  sys::fs::file_magic type;
  if (sys::fs::identify_magic(mbr->path.str(), type))
    type = sys::fs::file_magic::unknown;
  switch (type) {
    case sys::fs::file_magic::bitcode:
      flags |= ArchiveMember::BitcodeFlag;
      break;
    default:
      break;
  }
  mbr->flags = flags;
  members.insert(where,mbr);
  return false;
}

// Insert a file into the archive before some other member. This also takes care
// of extracting the necessary flags and information from the file.
bool
Archive::addFileBefore(const sys::Path& filePath, iterator where, 
                        std::string* ErrMsg) {
  if (!filePath.exists()) {
    if (ErrMsg)
      *ErrMsg = "Can not add a non-existent file to archive";
    return true;
  }

  ArchiveMember* mbr = new ArchiveMember(this);

  mbr->data = 0;
  mbr->path = filePath;
  const sys::FileStatus *FSInfo = mbr->path.getFileStatus(false, ErrMsg);
  if (!FSInfo) {
    delete mbr;
    return true;
  }
  mbr->info = *FSInfo;

  unsigned flags = 0;
  bool hasSlash = filePath.str().find('/') != std::string::npos;
  if (hasSlash)
    flags |= ArchiveMember::HasPathFlag;
  if (hasSlash || filePath.str().length() > 15)
    flags |= ArchiveMember::HasLongFilenameFlag;
  std::string magic;
  mbr->path.getMagicNumber(magic,4);
  switch (sys::IdentifyFileType(magic.c_str(),4)) {
    case sys::Bitcode_FileType:
      flags |= ArchiveMember::BitcodeFlag;
      break;
    default:
      break;
  }
  mbr->flags = flags;
  members.insert(where,mbr);
  return false;
}

// Execute the graph viewer. Return true if successful.
static bool LLVM_ATTRIBUTE_UNUSED
ExecGraphViewer(const sys::Path &ExecPath, std::vector<const char*> &args,
                const sys::Path &Filename, bool wait, std::string &ErrMsg) {
  if (wait) {
    if (sys::Program::ExecuteAndWait(ExecPath, &args[0],0,0,0,0,&ErrMsg)) {
      errs() << "Error: " << ErrMsg << "\n";
      return false;
    }
    Filename.eraseFromDisk();
    errs() << " done. \n";
  }
  else {
    sys::Program::ExecuteNoWait(ExecPath, &args[0],0,0,0,&ErrMsg);
    errs() << "Remember to erase graph file: " << Filename.str() << "\n";
  }
  return true;
}

// Get just the externally visible defined symbols from the bitcode
bool llvm::GetBitcodeSymbols(const sys::Path& fName,
                             LLVMContext& Context,
                             std::vector<std::string>& symbols,
                             std::string* ErrMsg) {
  OwningPtr<MemoryBuffer> Buffer;
  if (error_code ec = MemoryBuffer::getFileOrSTDIN(fName.c_str(), Buffer)) {
    if (ErrMsg) *ErrMsg = "Could not open file '" + fName.str() + "'" + ": "
                        + ec.message();
    return true;
  }

  Module *M = ParseBitcodeFile(Buffer.get(), Context, ErrMsg);
  if (!M)
    return true;

  // Get the symbols
  getSymbols(M, symbols);

  // Done with the module.
  delete M;
  return true;
}

/// LinkInFile - opens a bitcode file and links in all objects which
/// provide symbols that are currently undefined.
///
/// Inputs:
///  File - The pathname of the bitcode file.
///
/// Outputs:
///  ErrorMessage - A C++ string detailing what error occurred, if any.
///
/// Return Value:
///  TRUE  - An error occurred.
///  FALSE - No errors.
///
bool Linker::LinkInFile(const sys::Path &File, bool &is_native) {
  is_native = false;
  
  // Check for a file of name "-", which means "read standard input"
  if (File.str() == "-") {
    std::auto_ptr<Module> M;
    MemoryBuffer *Buffer = MemoryBuffer::getSTDIN();
    if (!Buffer->getBufferSize()) {
      delete Buffer;
      Error = "standard input is empty";
    } else {
      M.reset(ParseBitcodeFile(Buffer, Context, &Error));
      delete Buffer;
      if (M.get())
        if (!LinkInModule(M.get(), &Error))
          return false;
    }
    return error("Cannot link stdin: " + Error);
  }

  // Make sure we can at least read the file
  if (!File.canRead())
    return error("Cannot find linker input '" + File.str() + "'");

  // If its an archive, try to link it in
  std::string Magic;
  File.getMagicNumber(Magic, 64);
  switch (sys::IdentifyFileType(Magic.c_str(), 64)) {
    default: llvm_unreachable("Bad file type identification");
    case sys::Unknown_FileType:
      return warning("Ignoring file '" + File.str() + 
                   "' because does not contain bitcode.");

    case sys::Archive_FileType:
      // A user may specify an ar archive without -l, perhaps because it
      // is not installed as a library. Detect that and link the archive.
      if (LinkInArchive(File, is_native))
        return true;
      break;

    case sys::Bitcode_FileType: {
      verbose("Linking bitcode file '" + File.str() + "'");
      std::auto_ptr<Module> M(LoadObject(File));
      if (M.get() == 0)
        return error("Cannot load file '" + File.str() + "': " + Error);
      if (LinkInModule(M.get(), &Error))
        return error("Cannot link file '" + File.str() + "': " + Error);

      verbose("Linked in file '" + File.str() + "'");
      break;
    }

    case sys::ELF_Relocatable_FileType:
    case sys::ELF_SharedObject_FileType:
    case sys::Mach_O_Object_FileType:
    case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
    case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
    case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
    case sys::COFF_FileType:
      is_native = true;
      break;
  }
  return false;
}

void llvm::DisplayGraph(const sys::Path &Filename, bool wait,
                        GraphProgram::Name program) {
  std::string ErrMsg;
#if HAVE_GRAPHVIZ
  sys::Path Graphviz(LLVM_PATH_GRAPHVIZ);

  std::vector<const char*> args;
  args.push_back(Graphviz.c_str());
  args.push_back(Filename.c_str());
  args.push_back(0);
  
  errs() << "Running 'Graphviz' program... ";
  if (sys::Program::ExecuteAndWait(Graphviz, &args[0],0,0,0,0,&ErrMsg))
    errs() << "Error viewing graph " << Filename.str() << ": " << ErrMsg
           << "\n";
  else
    Filename.eraseFromDisk();

#elif (HAVE_GV && (HAVE_DOT || HAVE_FDP || HAVE_NEATO || \
                   HAVE_TWOPI || HAVE_CIRCO))
  sys::Path PSFilename = Filename;
  PSFilename.appendSuffix("ps");

  sys::Path prog;

  // Set default grapher
#if HAVE_CIRCO
  prog = sys::Path(LLVM_PATH_CIRCO);
#endif
#if HAVE_TWOPI
  prog = sys::Path(LLVM_PATH_TWOPI);
#endif
#if HAVE_NEATO
  prog = sys::Path(LLVM_PATH_NEATO);
#endif
#if HAVE_FDP
  prog = sys::Path(LLVM_PATH_FDP);
#endif
#if HAVE_DOT
  prog = sys::Path(LLVM_PATH_DOT);
#endif

  // Find which program the user wants
#if HAVE_DOT
  if (program == GraphProgram::DOT)
    prog = sys::Path(LLVM_PATH_DOT);
#endif
#if (HAVE_FDP)
  if (program == GraphProgram::FDP)
    prog = sys::Path(LLVM_PATH_FDP);
#endif
#if (HAVE_NEATO)
  if (program == GraphProgram::NEATO)
    prog = sys::Path(LLVM_PATH_NEATO);
#endif
#if (HAVE_TWOPI)
  if (program == GraphProgram::TWOPI)
    prog = sys::Path(LLVM_PATH_TWOPI);
#endif
#if (HAVE_CIRCO)
  if (program == GraphProgram::CIRCO)
    prog = sys::Path(LLVM_PATH_CIRCO);
#endif

  std::vector<const char*> args;
  args.push_back(prog.c_str());
  args.push_back("-Tps");
  args.push_back("-Nfontname=Courier");
  args.push_back("-Gsize=7.5,10");
  args.push_back(Filename.c_str());
  args.push_back("-o");
  args.push_back(PSFilename.c_str());
  args.push_back(0);
  
  errs() << "Running '" << prog.str() << "' program... ";

  if (sys::Program::ExecuteAndWait(prog, &args[0], 0, 0, 0, 0, &ErrMsg)) {
     errs() << "Error viewing graph " << Filename.str() << ": '"
            << ErrMsg << "\n";
  } else {
    errs() << " done. \n";

    sys::Path gv(LLVM_PATH_GV);
    args.clear();
    args.push_back(gv.c_str());
    args.push_back(PSFilename.c_str());
    args.push_back("--spartan");
    args.push_back(0);
    
    ErrMsg.clear();
    if (wait) {
       if (sys::Program::ExecuteAndWait(gv, &args[0],0,0,0,0,&ErrMsg))
          errs() << "Error viewing graph: " << ErrMsg << "\n";
       Filename.eraseFromDisk();
       PSFilename.eraseFromDisk();
    }
    else {
       sys::Program::ExecuteNoWait(gv, &args[0],0,0,0,&ErrMsg);
       errs() << "Remember to erase graph files: " << Filename.str() << " "
              << PSFilename.str() << "\n";
//.........这里部分代码省略.........

// This method allows an ArchiveMember to be replaced with the data for a
// different file, presumably as an update to the member. It also makes sure
// the flags are reset correctly.
bool ArchiveMember::replaceWith(const sys::Path& newFile, std::string* ErrMsg) {
  bool Exists;
  if (sys::fs::exists(newFile.str(), Exists) || !Exists) {
    if (ErrMsg)
      *ErrMsg = "Can not replace an archive member with a non-existent file";
    return true;
  }

  data = 0;
  path = newFile;

  // SVR4 symbol tables have an empty name
  if (path.str() == ARFILE_SVR4_SYMTAB_NAME)
    flags |= SVR4SymbolTableFlag;
  else
    flags &= ~SVR4SymbolTableFlag;

  // BSD4.4 symbol tables have a special name
  if (path.str() == ARFILE_BSD4_SYMTAB_NAME)
    flags |= BSD4SymbolTableFlag;
  else
    flags &= ~BSD4SymbolTableFlag;

  // LLVM symbol tables have a very specific name
  if (path.str() == ARFILE_LLVM_SYMTAB_NAME)
    flags |= LLVMSymbolTableFlag;
  else
    flags &= ~LLVMSymbolTableFlag;

  // String table name
  if (path.str() == ARFILE_STRTAB_NAME)
    flags |= StringTableFlag;
  else
    flags &= ~StringTableFlag;

  // If it has a slash then it has a path
  bool hasSlash = path.str().find('/') != std::string::npos;
  if (hasSlash)
    flags |= HasPathFlag;
  else
    flags &= ~HasPathFlag;

  // If it has a slash or its over 15 chars then its a long filename format
  if (hasSlash || path.str().length() > 15)
    flags |= HasLongFilenameFlag;
  else
    flags &= ~HasLongFilenameFlag;

  // Get the signature and status info
  const char* signature = (const char*) data;
  SmallString<4> magic;
  if (!signature) {
    sys::fs::get_magic(path.str(), magic.capacity(), magic);
    signature = magic.c_str();
    const sys::FileStatus *FSinfo = path.getFileStatus(false, ErrMsg);
    if (FSinfo)
      info = *FSinfo;
    else
      return true;
  }

  // Determine what kind of file it is.
  switch (sys::IdentifyFileType(signature,4)) {
    case sys::Bitcode_FileType:
      flags |= BitcodeFlag;
      break;
    default:
      flags &= ~BitcodeFlag;
      break;
  }
  return false;
}

static int CompileSubprocess(const char **argv, int argc, 
                             sys::Path &ResourceDir, bool bugreport,
                             bool versionOnly, sys::Path &apiMapPath)
{
  std::vector<char*> llvmArgs;
  char apim[] = "-clam-apimap";
  llvmArgs.push_back((char*)argv[0]);
  llvmArgs.push_back(apim);
  llvmArgs.push_back((char*)apiMapPath.c_str());

  // Split args into cc1 and LLVM args, separator is --
  int cc1_argc;
  for (cc1_argc=1;cc1_argc<argc;cc1_argc++) {
    if (StringRef(argv[cc1_argc]) == "--") {
      for (int i=cc1_argc+1;i<argc;i++) {
        llvmArgs.push_back((char*)argv[i]);
      }
      break;
    }
  }

  // Initialize CompilerInstance from commandline args
  CompilerInstance Clang;
  Clang.setLLVMContext(new llvm::LLVMContext);
  LLVMInitializeClamBCTargetInfo();
  LLVMInitializeClamBCTarget();

  TextDiagnosticBuffer DiagsBuffer;
  Diagnostic Diags(&DiagsBuffer);
  CompilerInvocation::CreateFromArgs(Clang.getInvocation(), argv+1,
                                     argv+cc1_argc, Diags);
  FrontendOptions &FrontendOpts = Clang.getInvocation().getFrontendOpts();
  // Handle --version
  if (FrontendOpts.ShowVersion || versionOnly) {
    printVersion(outs(), true);
    exit(0);
  }

  DiagnosticOptions &DiagOpts = Clang.getInvocation().getDiagnosticOpts();
  DiagOpts.ShowOptionNames = DiagOpts.ShowColors = 1;
  DiagOpts.MessageLength = 80;// we are writing to a file
  DiagOpts.Warnings.push_back("all");
  DiagOpts.Warnings.push_back("no-pointer-sign");

  Clang.createDiagnostics(argc-1, const_cast<char**>(argv+1));
  if (!Clang.hasDiagnostics())
    return 2;

  Clang.getInvocation().getHeaderSearchOpts().ResourceDir = ResourceDir.str();

  // Set default options
  LangOptions &LangOpts = Clang.getInvocation().getLangOpts();
  // This is a freestanding environment, without libc, etc.
  LangOpts.Freestanding = 1;
  HeaderSearchOptions &HeaderSearchOpts =
    Clang.getInvocation().getHeaderSearchOpts();
  HeaderSearchOpts.UseStandardIncludes = 0;
  if (bugreport)
    HeaderSearchOpts.Verbose = 1;

  if (FrontendOpts.ProgramAction != frontend::PrintPreprocessedInput)
    FrontendOpts.ProgramAction = frontend::EmitBC;
  if (bugreport)
    FrontendOpts.ProgramAction = frontend::PrintPreprocessedInput;

  // Don't bother freeing of memory on exit 
  FrontendOpts.DisableFree = 1;

  CodeGenOptions &Opts = Clang.getInvocation().getCodeGenOpts();
  Opts.Inlining = CodeGenOptions::OnlyAlwaysInlining;
  // always generate debug info, so that ClamBC backend can output sourcelevel
  // diagnostics.
  Opts.DebugInfo = true;
  // FIXME: once the verifier can work w/o targetdata, and targetdate opts set
  // DisableLLVMOpts to true!
  // This is needed to avoid target-specific optimizations
  Opts.DisableLLVMOpts = false;

  AnalyzerOptions &AOpts = Clang.getInvocation().getAnalyzerOpts();
  AOpts.AnalysisList.push_back(WarnDeadStores);
  AOpts.AnalysisList.push_back(WarnUninitVals);
  AOpts.AnalysisList.push_back(SecuritySyntacticChecks);
  AOpts.AnalysisList.push_back(WarnSizeofPointer);

  // Set triple
  Clang.getInvocation().getTargetOpts().Triple = "clambc-generic-generic";
  // Set default include
  Clang.getInvocation().getPreprocessorOpts().Includes.push_back("bytecode.h");

  // Set an LLVM error handler.
  llvm::llvm_install_error_handler(LLVMErrorHandler,
                                   static_cast<void*>(&Clang.getDiagnostics()));
  DiagsBuffer.FlushDiagnostics(Clang.getDiagnostics());
  // If there were any errors in processing arguments, exit now.
  if (Clang.getDiagnostics().getNumErrors())
    return 1;

  // Create the target instance.
  //TODO: directly create a clambc target
  Clang.setTarget(TargetInfo::CreateTargetInfo(Clang.getDiagnostics(),
//.........这里部分代码省略.........