C++ SourceManager::getFileManager方法代码示例

void TextDiagnostic::emitFilename(StringRef Filename, const SourceManager &SM) {
  SmallVector<char, 128> AbsoluteFilename;
  if (DiagOpts->AbsolutePath) {
    const DirectoryEntry *Dir = SM.getFileManager().getDirectory(
        llvm::sys::path::parent_path(Filename));
    if (Dir) {
      StringRef DirName = SM.getFileManager().getCanonicalName(Dir);
      llvm::sys::path::append(AbsoluteFilename, DirName,
                              llvm::sys::path::filename(Filename));
      Filename = StringRef(AbsoluteFilename.data(), AbsoluteFilename.size());
    }
  }

  OS << Filename;
}

HeaderSearch::HeaderSearch(IntrusiveRefCntPtr<HeaderSearchOptions> HSOpts,
                           SourceManager &SourceMgr, DiagnosticsEngine &Diags,
                           const LangOptions &LangOpts,
                           const TargetInfo *Target)
    : HSOpts(HSOpts), Diags(Diags), FileMgr(SourceMgr.getFileManager()),
      FrameworkMap(64), ModMap(SourceMgr, Diags, LangOpts, Target, *this),
      LangOpts(LangOpts) {
  AngledDirIdx = 0;
  SystemDirIdx = 0;
  NoCurDirSearch = false;

  ExternalLookup = nullptr;
  ExternalSource = nullptr;
  NumIncluded = 0;
  NumMultiIncludeFileOptzn = 0;
  NumFrameworkLookups = NumSubFrameworkLookups = 0;
}

//.........这里部分代码省略.........
      if (CI->getLangOpts().CPlusPlus11 == 1) {
        // http://llvm.org/bugs/show_bug.cgi?id=13530
        CI->getInvocation().getPreprocessorOpts()
          .addMacroDef("__CLING__CXX11");
      }

      if (CI->getDiagnostics().hasErrorOccurred()) {
        delete CI;
        CI = 0;
        return 0;
      }
    }
    CI->setTarget(TargetInfo::CreateTargetInfo(CI->getDiagnostics(),
                                               &Invocation->getTargetOpts()));
    if (!CI->hasTarget()) {
      delete CI;
      CI = 0;
      return 0;
    }
    CI->getTarget().setForcedLangOptions(CI->getLangOpts());
    SetClingTargetLangOpts(CI->getLangOpts(), CI->getTarget());
    if (CI->getTarget().getTriple().getOS() == llvm::Triple::Cygwin) {
      // clang "forgets" the basic arch part needed by winnt.h:
      if (CI->getTarget().getTriple().getArch() == llvm::Triple::x86) {
        CI->getInvocation().getPreprocessorOpts().addMacroDef("_X86_=1");
      } else if (CI->getTarget().getTriple().getArch()
                 == llvm::Triple::x86_64) {
        CI->getInvocation().getPreprocessorOpts().addMacroDef("__x86_64=1");
      } else {
        llvm::errs() << "Warning: unhandled target architecture "
                     << CI->getTarget().getTriple().getArchName() << '\n';
      }
    }

    // Set up source and file managers
    CI->createFileManager();
    SourceManager* SM = new SourceManager(CI->getDiagnostics(),
                                          CI->getFileManager(),
                                          /*UserFilesAreVolatile*/ true); 
    CI->setSourceManager(SM); // FIXME: SM leaks.

    // Set up the memory buffer
    if (buffer)
      CI->getSourceManager().createMainFileIDForMemBuffer(buffer);
    else {
      // As main file we want
      // * a virtual file that is claiming to be huge 
      // * with an empty memory buffer attached (to bring the content)
      SourceManager& SM = CI->getSourceManager();
      FileManager& FM = SM.getFileManager();
      // Build the virtual file
      const char* Filename = "InteractiveInputLineIncluder.h";
      const std::string& CGOptsMainFileName
        = CI->getInvocation().getCodeGenOpts().MainFileName;
      if (!CGOptsMainFileName.empty())
        Filename = CGOptsMainFileName.c_str();
      const FileEntry* FE
        = FM.getVirtualFile(Filename, 1U << 15U, time(0));
      FileID MainFileID = SM.createMainFileID(FE, SrcMgr::C_User);
      const SrcMgr::SLocEntry& MainFileSLocE = SM.getSLocEntry(MainFileID);
      const SrcMgr::ContentCache* MainFileCC
        = MainFileSLocE.getFile().getContentCache();
      llvm::MemoryBuffer* MainFileMB
        = llvm::MemoryBuffer::getMemBuffer("/*CLING MAIN FILE*/\n");
      const_cast<SrcMgr::ContentCache*>(MainFileCC)->setBuffer(MainFileMB);
    }

    // Set up the preprocessor
    CI->createPreprocessor();
    Preprocessor& PP = CI->getPreprocessor();
    PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
                                           PP.getLangOpts());

    // Set up the ASTContext
    ASTContext *Ctx = new ASTContext(CI->getLangOpts(),
                                     PP.getSourceManager(), &CI->getTarget(),
                                     PP.getIdentifierTable(),
                                     PP.getSelectorTable(), PP.getBuiltinInfo(),
                                     /*size_reserve*/0, /*DelayInit*/false);
    CI->setASTContext(Ctx);

    // Set up the ASTConsumers
    CI->setASTConsumer(new DeclCollector());

    // Set up Sema
    CodeCompleteConsumer* CCC = 0;
    CI->createSema(TU_Complete, CCC);

    // Set CodeGen options
    // CI->getCodeGenOpts().DebugInfo = 1; // want debug info
    // CI->getCodeGenOpts().EmitDeclMetadata = 1; // For unloading, for later
    CI->getCodeGenOpts().OptimizationLevel = 0; // see pure SSA, that comes out
    CI->getCodeGenOpts().CXXCtorDtorAliases = 0; // aliasing the complete
                                                 // ctor to the base ctor causes
                                                 // the JIT to crash
    // When asserts are on, TURN ON not compare the VerifyModule
    assert(CI->getCodeGenOpts().VerifyModule = 1);

    return CI;
  }

static int
do_assemble(SourceManager& source_mgr, DiagnosticsEngine& diags)
{
    // Apply warning settings
    ApplyWarningSettings(diags);

    // Determine objfmt_bits based on -32 and -64 options
    std::string objfmt_bits = GetBitsSetting();

    FileManager& file_mgr = source_mgr.getFileManager();
    Assembler assembler("x86", YGAS_OBJFMT_BASE + objfmt_bits, diags,
                        dump_object);
    HeaderSearch headers(file_mgr);

    if (diags.hasFatalErrorOccurred())
        return EXIT_FAILURE;

    // Set object filename if specified.
    if (!obj_filename.empty())
        assembler.setObjectFilename(obj_filename);

    // Set parser.
    assembler.setParser("gas", diags);

    if (diags.hasFatalErrorOccurred())
        return EXIT_FAILURE;

    // Set debug format to dwarf2pass if it's legal for this object format.
    if (assembler.isOkDebugFormat("dwarf2pass"))
    {
        assembler.setDebugFormat("dwarf2pass", diags);
        if (diags.hasFatalErrorOccurred())
            return EXIT_FAILURE;
    }

    // open the input file or STDIN (for filename of "-")
    if (in_filename == "-")
    {
        OwningPtr<MemoryBuffer> my_stdin;
        if (llvm::error_code err = MemoryBuffer::getSTDIN(my_stdin))
        {
            diags.Report(SourceLocation(), diag::fatal_file_open)
                << in_filename << err.message();
            return EXIT_FAILURE;
        }
        source_mgr.createMainFileIDForMemBuffer(my_stdin.take());
    }
    else
    {
        const FileEntry* in = file_mgr.getFile(in_filename);
        if (!in)
        {
            diags.Report(SourceLocation(), diag::fatal_file_open)
                << in_filename;
            return EXIT_FAILURE;
        }
        source_mgr.createMainFileID(in);
    }

    // Initialize the object.
    if (!assembler.InitObject(source_mgr, diags))
        return EXIT_FAILURE;

    // Configure object per command line parameters.
    ConfigureObject(*assembler.getObject());

    // Predefine symbols.
    for (std::vector<std::string>::const_iterator i=defsym.begin(),
         end=defsym.end(); i != end; ++i)
    {
        StringRef str(*i);
        size_t equalpos = str.find('=');
        if (equalpos == StringRef::npos)
        {
            diags.Report(diag::fatal_bad_defsym) << str;
            continue;
        }
        StringRef name = str.slice(0, equalpos);
        StringRef vstr = str.slice(equalpos+1, StringRef::npos);

        IntNum value;
        if (!vstr.empty())
        {
            // determine radix
            unsigned int radix;
            if (vstr[0] == '0' && vstr.size() > 1 &&
                (vstr[1] == 'x' || vstr[1] == 'X'))
            {
                vstr = vstr.substr(2);
                radix = 16;
            }
            else if (vstr[0] == '0')
            {
                vstr = vstr.substr(1);
                radix = 8;
            }
            else
                radix = 10;

            // check validity
//.........这里部分代码省略.........