bool RewriteIncludesAction::BeginSourceFileAction(CompilerInstance &CI) {
  if (!OutputStream) {
    OutputStream =
        CI.createDefaultOutputFile(true, getCurrentFileOrBufferName());
    if (!OutputStream)
      return false;
  }

  auto &OS = *OutputStream;

  // If we're preprocessing a module map, start by dumping the contents of the
  // module itself before switching to the input buffer.
  auto &Input = getCurrentInput();
  if (Input.getKind().getFormat() == InputKind::ModuleMap) {
    if (Input.isFile()) {
      OS << "# 1 \"";
      OS.write_escaped(Input.getFile());
      OS << "\"\n";
    }
    getCurrentModule()->print(OS);
    OS << "#pragma clang module contents\n";
  }

  // If we're rewriting imports, set up a listener to track when we import
  // module files.
  if (CI.getPreprocessorOutputOpts().RewriteImports) {
    CI.createModuleManager();
    CI.getModuleManager()->addListener(
        llvm::make_unique<RewriteImportsListener>(CI, OutputStream));
  }

  return true;
}
Beispiel #2
0
bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
                                     const FrontendInputFile &Input) {
  assert(!Instance && "Already processing a source file!");
  assert(!Input.isEmpty() && "Unexpected empty filename!");
  setCurrentInput(Input);
  setCompilerInstance(&CI);

  StringRef InputFile = Input.getFile();
  bool HasBegunSourceFile = false;
  if (!BeginInvocation(CI))
    goto failure;

  // AST files follow a very different path, since they share objects via the
  // AST unit.
  if (Input.getKind() == IK_AST) {
    assert(!usesPreprocessorOnly() &&
           "Attempt to pass AST file to preprocessor only action!");
    assert(hasASTFileSupport() &&
           "This action does not have AST file support!");

    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics());

    std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromASTFile(
        InputFile, CI.getPCHContainerReader(), Diags, CI.getFileSystemOpts(),
        CI.getCodeGenOpts().DebugTypeExtRefs);

    if (!AST)
      goto failure;

    // Inform the diagnostic client we are processing a source file.
    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
    HasBegunSourceFile = true;

    // Set the shared objects, these are reset when we finish processing the
    // file, otherwise the CompilerInstance will happily destroy them.
    CI.setFileManager(&AST->getFileManager());
    CI.setSourceManager(&AST->getSourceManager());
    CI.setPreprocessor(AST->getPreprocessorPtr());
    CI.setASTContext(&AST->getASTContext());

    setCurrentInput(Input, std::move(AST));

    // Initialize the action.
    if (!BeginSourceFileAction(CI, InputFile))
      goto failure;

    // Create the AST consumer.
    CI.setASTConsumer(CreateWrappedASTConsumer(CI, InputFile));
    if (!CI.hasASTConsumer())
      goto failure;

    return true;
  }

  if (!CI.hasVirtualFileSystem()) {
    if (IntrusiveRefCntPtr<vfs::FileSystem> VFS =
          createVFSFromCompilerInvocation(CI.getInvocation(),
                                          CI.getDiagnostics()))
      CI.setVirtualFileSystem(VFS);
    else
      goto failure;
  }

  // Set up the file and source managers, if needed.
  if (!CI.hasFileManager())
    CI.createFileManager();
  if (!CI.hasSourceManager())
    CI.createSourceManager(CI.getFileManager());

  // IR files bypass the rest of initialization.
  if (Input.getKind() == IK_LLVM_IR) {
    assert(hasIRSupport() &&
           "This action does not have IR file support!");

    // Inform the diagnostic client we are processing a source file.
    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
    HasBegunSourceFile = true;

    // Initialize the action.
    if (!BeginSourceFileAction(CI, InputFile))
      goto failure;

    // Initialize the main file entry.
    if (!CI.InitializeSourceManager(CurrentInput))
      goto failure;

    return true;
  }

  // If the implicit PCH include is actually a directory, rather than
  // a single file, search for a suitable PCH file in that directory.
  if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
    FileManager &FileMgr = CI.getFileManager();
    PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
    StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
    std::string SpecificModuleCachePath = CI.getSpecificModuleCachePath();
    if (const DirectoryEntry *PCHDir = FileMgr.getDirectory(PCHInclude)) {
      std::error_code EC;
      SmallString<128> DirNative;
      llvm::sys::path::native(PCHDir->getName(), DirNative);
      bool Found = false;
      vfs::FileSystem &FS = *FileMgr.getVirtualFileSystem();
      for (vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
           Dir != DirEnd && !EC; Dir.increment(EC)) {
        // Check whether this is an acceptable AST file.
        if (ASTReader::isAcceptableASTFile(
                Dir->getName(), FileMgr, CI.getPCHContainerReader(),
                CI.getLangOpts(), CI.getTargetOpts(), CI.getPreprocessorOpts(),
                SpecificModuleCachePath)) {
          PPOpts.ImplicitPCHInclude = Dir->getName();
          Found = true;
          break;
        }
      }

      if (!Found) {
        CI.getDiagnostics().Report(diag::err_fe_no_pch_in_dir) << PCHInclude;
        goto failure;
      }
    }
  }

  // Set up the preprocessor if needed. When parsing model files the
  // preprocessor of the original source is reused.
  if (!isModelParsingAction())
    CI.createPreprocessor(getTranslationUnitKind());

  // Inform the diagnostic client we are processing a source file.
  CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
                                           &CI.getPreprocessor());
  HasBegunSourceFile = true;

  // Initialize the action.
  if (!BeginSourceFileAction(CI, InputFile))
    goto failure;

  // Initialize the main file entry. It is important that this occurs after
  // BeginSourceFileAction, which may change CurrentInput during module builds.
  if (!CI.InitializeSourceManager(CurrentInput))
    goto failure;

  // Create the AST context and consumer unless this is a preprocessor only
  // action.
  if (!usesPreprocessorOnly()) {
    // Parsing a model file should reuse the existing ASTContext.
    if (!isModelParsingAction())
      CI.createASTContext();

    std::unique_ptr<ASTConsumer> Consumer =
        CreateWrappedASTConsumer(CI, InputFile);
    if (!Consumer)
      goto failure;

    // FIXME: should not overwrite ASTMutationListener when parsing model files?
    if (!isModelParsingAction())
      CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener());

    if (!CI.getPreprocessorOpts().ChainedIncludes.empty()) {
      // Convert headers to PCH and chain them.
      IntrusiveRefCntPtr<ExternalSemaSource> source, FinalReader;
      source = createChainedIncludesSource(CI, FinalReader);
      if (!source)
        goto failure;
      CI.setModuleManager(static_cast<ASTReader *>(FinalReader.get()));
      CI.getASTContext().setExternalSource(source);
    } else if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
      // Use PCH.
      assert(hasPCHSupport() && "This action does not have PCH support!");
      ASTDeserializationListener *DeserialListener =
          Consumer->GetASTDeserializationListener();
      bool DeleteDeserialListener = false;
      if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls) {
        DeserialListener = new DeserializedDeclsDumper(DeserialListener,
                                                       DeleteDeserialListener);
        DeleteDeserialListener = true;
      }
      if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty()) {
        DeserialListener = new DeserializedDeclsChecker(
            CI.getASTContext(),
            CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn,
            DeserialListener, DeleteDeserialListener);
        DeleteDeserialListener = true;
      }
      CI.createPCHExternalASTSource(
          CI.getPreprocessorOpts().ImplicitPCHInclude,
          CI.getPreprocessorOpts().DisablePCHValidation,
          CI.getPreprocessorOpts().AllowPCHWithCompilerErrors, DeserialListener,
          DeleteDeserialListener);
      if (!CI.getASTContext().getExternalSource())
        goto failure;
    }

    CI.setASTConsumer(std::move(Consumer));
    if (!CI.hasASTConsumer())
      goto failure;
  }

  // Initialize built-in info as long as we aren't using an external AST
  // source.
  if (!CI.hasASTContext() || !CI.getASTContext().getExternalSource()) {
    Preprocessor &PP = CI.getPreprocessor();

    // If modules are enabled, create the module manager before creating
    // any builtins, so that all declarations know that they might be
    // extended by an external source.
    if (CI.getLangOpts().Modules)
      CI.createModuleManager();

    PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
                                           PP.getLangOpts());
  } else {
    // FIXME: If this is a problem, recover from it by creating a multiplex
    // source.
    assert((!CI.getLangOpts().Modules || CI.getModuleManager()) &&
           "modules enabled but created an external source that "
           "doesn't support modules");
  }

  // If we were asked to load any module map files, do so now.
  for (const auto &Filename : CI.getFrontendOpts().ModuleMapFiles) {
    if (auto *File = CI.getFileManager().getFile(Filename))
      CI.getPreprocessor().getHeaderSearchInfo().loadModuleMapFile(
          File, /*IsSystem*/false);
    else
      CI.getDiagnostics().Report(diag::err_module_map_not_found) << Filename;
  }

  // If we were asked to load any module files, do so now.
  for (const auto &ModuleFile : CI.getFrontendOpts().ModuleFiles)
    if (!CI.loadModuleFile(ModuleFile))
      goto failure;

  // If there is a layout overrides file, attach an external AST source that
  // provides the layouts from that file.
  if (!CI.getFrontendOpts().OverrideRecordLayoutsFile.empty() && 
      CI.hasASTContext() && !CI.getASTContext().getExternalSource()) {
    IntrusiveRefCntPtr<ExternalASTSource> 
      Override(new LayoutOverrideSource(
                     CI.getFrontendOpts().OverrideRecordLayoutsFile));
    CI.getASTContext().setExternalSource(Override);
  }

  return true;

  // If we failed, reset state since the client will not end up calling the
  // matching EndSourceFile().
  failure:
  if (isCurrentFileAST()) {
    CI.setASTContext(nullptr);
    CI.setPreprocessor(nullptr);
    CI.setSourceManager(nullptr);
    CI.setFileManager(nullptr);
  }

  if (HasBegunSourceFile)
    CI.getDiagnosticClient().EndSourceFile();
  CI.clearOutputFiles(/*EraseFiles=*/true);
  setCurrentInput(FrontendInputFile());
  setCompilerInstance(nullptr);
  return false;
}
Beispiel #3
0
bool FrontendAction::BeginSourceFile(CompilerInstance &CI,
                                     const FrontendInputFile &RealInput) {
  FrontendInputFile Input(RealInput);
  assert(!Instance && "Already processing a source file!");
  assert(!Input.isEmpty() && "Unexpected empty filename!");
  setCurrentInput(Input);
  setCompilerInstance(&CI);

  StringRef InputFile = Input.getFile();
  bool HasBegunSourceFile = false;
  bool ReplayASTFile = Input.getKind().getFormat() == InputKind::Precompiled &&
                       usesPreprocessorOnly();
  if (!BeginInvocation(CI))
    goto failure;

  // If we're replaying the build of an AST file, import it and set up
  // the initial state from its build.
  if (ReplayASTFile) {
    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics());

    // The AST unit populates its own diagnostics engine rather than ours.
    IntrusiveRefCntPtr<DiagnosticsEngine> ASTDiags(
        new DiagnosticsEngine(Diags->getDiagnosticIDs(),
                              &Diags->getDiagnosticOptions()));
    ASTDiags->setClient(Diags->getClient(), /*OwnsClient*/false);

    std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromASTFile(
        InputFile, CI.getPCHContainerReader(), ASTUnit::LoadPreprocessorOnly,
        ASTDiags, CI.getFileSystemOpts(), CI.getCodeGenOpts().DebugTypeExtRefs);
    if (!AST)
      goto failure;

    // Options relating to how we treat the input (but not what we do with it)
    // are inherited from the AST unit.
    CI.getHeaderSearchOpts() = AST->getHeaderSearchOpts();
    CI.getPreprocessorOpts() = AST->getPreprocessorOpts();
    CI.getLangOpts() = AST->getLangOpts();

    // Set the shared objects, these are reset when we finish processing the
    // file, otherwise the CompilerInstance will happily destroy them.
    CI.setFileManager(&AST->getFileManager());
    CI.createSourceManager(CI.getFileManager());
    CI.getSourceManager().initializeForReplay(AST->getSourceManager());

    // Preload all the module files loaded transitively by the AST unit. Also
    // load all module map files that were parsed as part of building the AST
    // unit.
    if (auto ASTReader = AST->getASTReader()) {
      auto &MM = ASTReader->getModuleManager();
      auto &PrimaryModule = MM.getPrimaryModule();

      for (ModuleFile &MF : MM)
        if (&MF != &PrimaryModule)
          CI.getFrontendOpts().ModuleFiles.push_back(MF.FileName);

      ASTReader->visitTopLevelModuleMaps(PrimaryModule,
                                         [&](const FileEntry *FE) {
        CI.getFrontendOpts().ModuleMapFiles.push_back(FE->getName());
      });
    }

    // Set up the input file for replay purposes.
    auto Kind = AST->getInputKind();
    if (Kind.getFormat() == InputKind::ModuleMap) {
      Module *ASTModule =
          AST->getPreprocessor().getHeaderSearchInfo().lookupModule(
              AST->getLangOpts().CurrentModule, /*AllowSearch*/ false);
      assert(ASTModule && "module file does not define its own module");
      Input = FrontendInputFile(ASTModule->PresumedModuleMapFile, Kind);
    } else {
      auto &SM = CI.getSourceManager();
      FileID ID = SM.getMainFileID();
      if (auto *File = SM.getFileEntryForID(ID))
        Input = FrontendInputFile(File->getName(), Kind);
      else
        Input = FrontendInputFile(SM.getBuffer(ID), Kind);
    }
    setCurrentInput(Input, std::move(AST));
  }

  // AST files follow a very different path, since they share objects via the
  // AST unit.
  if (Input.getKind().getFormat() == InputKind::Precompiled) {
    assert(!usesPreprocessorOnly() && "this case was handled above");
    assert(hasASTFileSupport() &&
           "This action does not have AST file support!");

    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(&CI.getDiagnostics());

    std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromASTFile(
        InputFile, CI.getPCHContainerReader(), ASTUnit::LoadEverything, Diags,
        CI.getFileSystemOpts(), CI.getCodeGenOpts().DebugTypeExtRefs);

    if (!AST)
      goto failure;

    // Inform the diagnostic client we are processing a source file.
    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
    HasBegunSourceFile = true;

    // Set the shared objects, these are reset when we finish processing the
    // file, otherwise the CompilerInstance will happily destroy them.
    CI.setFileManager(&AST->getFileManager());
    CI.setSourceManager(&AST->getSourceManager());
    CI.setPreprocessor(AST->getPreprocessorPtr());
    Preprocessor &PP = CI.getPreprocessor();
    PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
                                           PP.getLangOpts());
    CI.setASTContext(&AST->getASTContext());

    setCurrentInput(Input, std::move(AST));

    // Initialize the action.
    if (!BeginSourceFileAction(CI))
      goto failure;

    // Create the AST consumer.
    CI.setASTConsumer(CreateWrappedASTConsumer(CI, InputFile));
    if (!CI.hasASTConsumer())
      goto failure;

    return true;
  }

  // Set up the file and source managers, if needed.
  if (!CI.hasFileManager()) {
    if (!CI.createFileManager()) {
      goto failure;
    }
  }
  if (!CI.hasSourceManager())
    CI.createSourceManager(CI.getFileManager());

  // Set up embedding for any specified files. Do this before we load any
  // source files, including the primary module map for the compilation.
  for (const auto &F : CI.getFrontendOpts().ModulesEmbedFiles) {
    if (const auto *FE = CI.getFileManager().getFile(F, /*openFile*/true))
      CI.getSourceManager().setFileIsTransient(FE);
    else
      CI.getDiagnostics().Report(diag::err_modules_embed_file_not_found) << F;
  }
  if (CI.getFrontendOpts().ModulesEmbedAllFiles)
    CI.getSourceManager().setAllFilesAreTransient(true);

  // IR files bypass the rest of initialization.
  if (Input.getKind().getLanguage() == InputKind::LLVM_IR) {
    assert(hasIRSupport() &&
           "This action does not have IR file support!");

    // Inform the diagnostic client we are processing a source file.
    CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(), nullptr);
    HasBegunSourceFile = true;

    // Initialize the action.
    if (!BeginSourceFileAction(CI))
      goto failure;

    // Initialize the main file entry.
    if (!CI.InitializeSourceManager(CurrentInput))
      goto failure;

    return true;
  }

  // If the implicit PCH include is actually a directory, rather than
  // a single file, search for a suitable PCH file in that directory.
  if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
    FileManager &FileMgr = CI.getFileManager();
    PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
    StringRef PCHInclude = PPOpts.ImplicitPCHInclude;
    std::string SpecificModuleCachePath = CI.getSpecificModuleCachePath();
    if (const DirectoryEntry *PCHDir = FileMgr.getDirectory(PCHInclude)) {
      std::error_code EC;
      SmallString<128> DirNative;
      llvm::sys::path::native(PCHDir->getName(), DirNative);
      bool Found = false;
      vfs::FileSystem &FS = *FileMgr.getVirtualFileSystem();
      for (vfs::directory_iterator Dir = FS.dir_begin(DirNative, EC), DirEnd;
           Dir != DirEnd && !EC; Dir.increment(EC)) {
        // Check whether this is an acceptable AST file.
        if (ASTReader::isAcceptableASTFile(
                Dir->getName(), FileMgr, CI.getPCHContainerReader(),
                CI.getLangOpts(), CI.getTargetOpts(), CI.getPreprocessorOpts(),
                SpecificModuleCachePath)) {
          PPOpts.ImplicitPCHInclude = Dir->getName();
          Found = true;
          break;
        }
      }

      if (!Found) {
        CI.getDiagnostics().Report(diag::err_fe_no_pch_in_dir) << PCHInclude;
        goto failure;
      }
    }
  }

  // Set up the preprocessor if needed. When parsing model files the
  // preprocessor of the original source is reused.
  if (!isModelParsingAction())
    CI.createPreprocessor(getTranslationUnitKind());

  // Inform the diagnostic client we are processing a source file.
  CI.getDiagnosticClient().BeginSourceFile(CI.getLangOpts(),
                                           &CI.getPreprocessor());
  HasBegunSourceFile = true;

  // Initialize the main file entry.
  if (!CI.InitializeSourceManager(Input))
    goto failure;

  // For module map files, we first parse the module map and synthesize a
  // "<module-includes>" buffer before more conventional processing.
  if (Input.getKind().getFormat() == InputKind::ModuleMap) {
    CI.getLangOpts().setCompilingModule(LangOptions::CMK_ModuleMap);

    std::string PresumedModuleMapFile;
    unsigned OffsetToContents;
    if (loadModuleMapForModuleBuild(CI, Input.isSystem(),
                                    Input.isPreprocessed(),
                                    PresumedModuleMapFile, OffsetToContents))
      goto failure;

    auto *CurrentModule = prepareToBuildModule(CI, Input.getFile());
    if (!CurrentModule)
      goto failure;

    CurrentModule->PresumedModuleMapFile = PresumedModuleMapFile;

    if (OffsetToContents)
      // If the module contents are in the same file, skip to them.
      CI.getPreprocessor().setSkipMainFilePreamble(OffsetToContents, true);
    else {
      // Otherwise, convert the module description to a suitable input buffer.
      auto Buffer = getInputBufferForModule(CI, CurrentModule);
      if (!Buffer)
        goto failure;

      // Reinitialize the main file entry to refer to the new input.
      auto Kind = CurrentModule->IsSystem ? SrcMgr::C_System : SrcMgr::C_User;
      auto &SourceMgr = CI.getSourceManager();
      auto BufferID = SourceMgr.createFileID(std::move(Buffer), Kind);
      assert(BufferID.isValid() && "couldn't creaate module buffer ID");
      SourceMgr.setMainFileID(BufferID);
    }
  }

  // Initialize the action.
  if (!BeginSourceFileAction(CI))
    goto failure;

  // If we were asked to load any module map files, do so now.
  for (const auto &Filename : CI.getFrontendOpts().ModuleMapFiles) {
    if (auto *File = CI.getFileManager().getFile(Filename))
      CI.getPreprocessor().getHeaderSearchInfo().loadModuleMapFile(
          File, /*IsSystem*/false);
    else
      CI.getDiagnostics().Report(diag::err_module_map_not_found) << Filename;
  }

  // Add a module declaration scope so that modules from -fmodule-map-file
  // arguments may shadow modules found implicitly in search paths.
  CI.getPreprocessor()
      .getHeaderSearchInfo()
      .getModuleMap()
      .finishModuleDeclarationScope();

  // Create the AST context and consumer unless this is a preprocessor only
  // action.
  if (!usesPreprocessorOnly()) {
    // Parsing a model file should reuse the existing ASTContext.
    if (!isModelParsingAction())
      CI.createASTContext();

    // For preprocessed files, check if the first line specifies the original
    // source file name with a linemarker.
    std::string PresumedInputFile = InputFile;
    if (Input.isPreprocessed())
      ReadOriginalFileName(CI, PresumedInputFile);

    std::unique_ptr<ASTConsumer> Consumer =
        CreateWrappedASTConsumer(CI, PresumedInputFile);
    if (!Consumer)
      goto failure;

    // FIXME: should not overwrite ASTMutationListener when parsing model files?
    if (!isModelParsingAction())
      CI.getASTContext().setASTMutationListener(Consumer->GetASTMutationListener());

    if (!CI.getPreprocessorOpts().ChainedIncludes.empty()) {
      // Convert headers to PCH and chain them.
      IntrusiveRefCntPtr<ExternalSemaSource> source, FinalReader;
      source = createChainedIncludesSource(CI, FinalReader);
      if (!source)
        goto failure;
      CI.setModuleManager(static_cast<ASTReader *>(FinalReader.get()));
      CI.getASTContext().setExternalSource(source);
    } else if (CI.getLangOpts().Modules ||
               !CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
      // Use PCM or PCH.
      assert(hasPCHSupport() && "This action does not have PCH support!");
      ASTDeserializationListener *DeserialListener =
          Consumer->GetASTDeserializationListener();
      bool DeleteDeserialListener = false;
      if (CI.getPreprocessorOpts().DumpDeserializedPCHDecls) {
        DeserialListener = new DeserializedDeclsDumper(DeserialListener,
                                                       DeleteDeserialListener);
        DeleteDeserialListener = true;
      }
      if (!CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn.empty()) {
        DeserialListener = new DeserializedDeclsChecker(
            CI.getASTContext(),
            CI.getPreprocessorOpts().DeserializedPCHDeclsToErrorOn,
            DeserialListener, DeleteDeserialListener);
        DeleteDeserialListener = true;
      }
      if (!CI.getPreprocessorOpts().ImplicitPCHInclude.empty()) {
        CI.createPCHExternalASTSource(
            CI.getPreprocessorOpts().ImplicitPCHInclude,
            CI.getPreprocessorOpts().DisablePCHValidation,
          CI.getPreprocessorOpts().AllowPCHWithCompilerErrors, DeserialListener,
            DeleteDeserialListener);
        if (!CI.getASTContext().getExternalSource())
          goto failure;
      }
      // If modules are enabled, create the module manager before creating
      // any builtins, so that all declarations know that they might be
      // extended by an external source.
      if (CI.getLangOpts().Modules || !CI.hasASTContext() ||
          !CI.getASTContext().getExternalSource()) {
        CI.createModuleManager();
        CI.getModuleManager()->setDeserializationListener(DeserialListener,
                                                        DeleteDeserialListener);
      }
    }

    CI.setASTConsumer(std::move(Consumer));
    if (!CI.hasASTConsumer())
      goto failure;
  }

  // Initialize built-in info as long as we aren't using an external AST
  // source.
  if (CI.getLangOpts().Modules || !CI.hasASTContext() ||
      !CI.getASTContext().getExternalSource()) {
    Preprocessor &PP = CI.getPreprocessor();
    PP.getBuiltinInfo().initializeBuiltins(PP.getIdentifierTable(),
                                           PP.getLangOpts());
  } else {
    // FIXME: If this is a problem, recover from it by creating a multiplex
    // source.
    assert((!CI.getLangOpts().Modules || CI.getModuleManager()) &&
           "modules enabled but created an external source that "
           "doesn't support modules");
  }

  // If we were asked to load any module files, do so now.
  for (const auto &ModuleFile : CI.getFrontendOpts().ModuleFiles)
    if (!CI.loadModuleFile(ModuleFile))
      goto failure;

  // If there is a layout overrides file, attach an external AST source that
  // provides the layouts from that file.
  if (!CI.getFrontendOpts().OverrideRecordLayoutsFile.empty() &&
      CI.hasASTContext() && !CI.getASTContext().getExternalSource()) {
    IntrusiveRefCntPtr<ExternalASTSource>
      Override(new LayoutOverrideSource(
                     CI.getFrontendOpts().OverrideRecordLayoutsFile));
    CI.getASTContext().setExternalSource(Override);
  }

  return true;

  // If we failed, reset state since the client will not end up calling the
  // matching EndSourceFile().
failure:
  if (HasBegunSourceFile)
    CI.getDiagnosticClient().EndSourceFile();
  CI.clearOutputFiles(/*EraseFiles=*/true);
  CI.getLangOpts().setCompilingModule(LangOptions::CMK_None);
  setCurrentInput(FrontendInputFile());
  setCompilerInstance(nullptr);
  return false;
}