//=== Serialization/PCHContainerOperations.cpp - PCH Containers -*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

//  This file defines PCHContainerOperations and RawPCHContainerOperation.

//

//===----------------------------------------------------------------------===//

#include "clang/Serialization/PCHContainerOperations.h"

#include "clang/AST/ASTConsumer.h"

#include "clang/Lex/ModuleLoader.h"

#include "llvm/Bitstream/BitstreamReader.h"

#include "llvm/Support/raw_ostream.h"

#include <utility>

using namespace clang;

PCHContainerWriter::~PCHContainerWriter() {}

PCHContainerReader::~PCHContainerReader() {}

namespace {

/// A PCHContainerGenerator that writes out the PCH to a flat file.

class RawPCHContainerGenerator : public ASTConsumer {

  std::shared_ptr<PCHBuffer> Buffer;

  std::unique_ptr<raw_pwrite_stream> OS;

public:

  RawPCHContainerGenerator(std::unique_ptr<llvm::raw_pwrite_stream> OS,

                           std::shared_ptr<PCHBuffer> Buffer)

      : Buffer(std::move(Buffer)), OS(std::move(OS)) {}

  ~RawPCHContainerGenerator() override = default;

  void HandleTranslationUnit(ASTContext &Ctx) override {

    if (Buffer->IsComplete) {

      // Make sure it hits disk now.

      *OS << Buffer->Data;

      OS->flush();

    }

    // Free the space of the temporary buffer.

    llvm::SmallVector<char, 0> Empty;

    Buffer->Data = std::move(Empty);

  }

};

} // anonymous namespace

std::unique_ptr<ASTConsumer> RawPCHContainerWriter::CreatePCHContainerGenerator(

    CompilerInstance &CI, const std::string &MainFileName,

    const std::string &OutputFileName, std::unique_ptr<llvm::raw_pwrite_stream> OS,

    std::shared_ptr<PCHBuffer> Buffer) const {

  return std::make_unique<RawPCHContainerGenerator>(std::move(OS), Buffer);

}

ArrayRef<llvm::StringRef> RawPCHContainerReader::getFormats() const {

  static StringRef Raw("raw");

  return ArrayRef(Raw);

}

StringRef

RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const {

  return Buffer.getBuffer();

}

PCHContainerOperations::PCHContainerOperations() {

  registerWriter(std::make_unique<RawPCHContainerWriter>());

  registerReader(std::make_unique<RawPCHContainerReader>());

}