C++ ASTReader::InitializeSema方法代码示例

//.........这里部分代码省略.........
                                               0);
      if (!FromFile) {
        AST->getDiagnostics().Report(diag::err_fe_remap_missing_from_file)
          << RemappedFiles[I].first;
        delete memBuf;
        continue;
      }

      // Override the contents of the "from" file with the contents of
      // the "to" file.
      AST->getSourceManager().overrideFileContents(FromFile, ToFile);
    }
  }

  // Gather Info for preprocessor construction later on.

  LangOptions LangInfo;
  ImportSearch &HeaderInfo = *AST->ImportInfo.get();
  std::string TargetTriple;
  std::string Predefines;
  unsigned Counter;

  llvm::OwningPtr<ASTReader> Reader;

  Reader.reset(new ASTReader(AST->getSourceManager(), AST->getFileManager(),
                             AST->getDiagnostics()));

  // Recover resources if we crash before exiting this method.
  llvm::CrashRecoveryContextCleanupRegistrar<ASTReader>
    ReaderCleanup(Reader.get());

  Reader->setListener(new ASTInfoCollector(LangInfo, HeaderInfo, TargetTriple,
                                           Predefines, Counter));

  switch (Reader->ReadAST(Filename, ASTReader::MainFile)) {
  case ASTReader::Success:
    break;

  case ASTReader::Failure:
  case ASTReader::IgnorePCH:
    AST->getDiagnostics().Report(diag::err_fe_unable_to_load_pch);
    return NULL;
  }

  AST->OriginalSourceFile = Reader->getOriginalSourceFile();

  // AST file loaded successfully. Now create the preprocessor.

  // Get information about the target being compiled for.
  //
  // FIXME: This is broken, we should store the TargetOptions in the AST file.
  TargetOptions TargetOpts;
  TargetOpts.ABI = "";
  //TargetOpts.GmatABI = "";
  TargetOpts.CPU = "";
  TargetOpts.Features.clear();
  TargetOpts.Triple = TargetTriple;
  AST->Target = TargetInfo::CreateTargetInfo(AST->getDiagnostics(),
                                             TargetOpts);
  AST->PP = new Preprocessor(AST->getDiagnostics(), LangInfo, *AST->Target,
                             AST->getSourceManager(), HeaderInfo);
  Preprocessor &PP = *AST->PP;

  PP.setCounterValue(Counter);
  Reader->setPreprocessor(PP);

  // Create and initialize the ASTContext.

  AST->Ctx = new ASTContext(LangInfo,
                            AST->getSourceManager(),
                            *AST->Target,
                            PP.getIdentifierTable(),
                            PP.getBuiltinInfo(),
                            /* size_reserve = */0);
  ASTContext &Context = *AST->Ctx;

  Reader->InitializeContext(Context);

  // Attach the AST reader to the AST context as an external AST
  // source, so that declarations will be deserialized from the
  // AST file as needed.
  ASTReader *ReaderPtr = Reader.get();
  llvm::OwningPtr<ExternalASTSource> Source(Reader.take());

  // Unregister the cleanup for ASTReader.  It will get cleaned up
  // by the ASTUnit cleanup.
  ReaderCleanup.unregister();

  Context.setExternalSource(Source);

  // Create an AST consumer, even though it isn't used.
  AST->Consumer.reset(new ASTConsumer);

  // Create a semantic analysis object and tell the AST reader about it.
  AST->TheSema.reset(new Sema(PP, Context, *AST->Consumer));
  AST->TheSema->Initialize();
  ReaderPtr->InitializeSema(*AST->TheSema);

  return AST.take();
}