PCHContainerOperations.cpp revision 360784 
1//=== Serialization/PCHContainerOperations.cpp - PCH Containers -*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file defines PCHContainerOperations and RawPCHContainerOperation.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/Serialization/PCHContainerOperations.h"
14#include "clang/AST/ASTConsumer.h"
15#include "clang/Lex/ModuleLoader.h"
16#include "llvm/Bitstream/BitstreamReader.h"
17#include "llvm/Support/raw_ostream.h"
18#include <utility>
19
20using namespace clang;
21
22PCHContainerWriter::~PCHContainerWriter() {}
23PCHContainerReader::~PCHContainerReader() {}
24
25namespace {
26
27/// A PCHContainerGenerator that writes out the PCH to a flat file.
28class RawPCHContainerGenerator : public ASTConsumer {
29  std::shared_ptr<PCHBuffer> Buffer;
30  std::unique_ptr<raw_pwrite_stream> OS;
31
32public:
33  RawPCHContainerGenerator(std::unique_ptr<llvm::raw_pwrite_stream> OS,
34                           std::shared_ptr<PCHBuffer> Buffer)
35      : Buffer(std::move(Buffer)), OS(std::move(OS)) {}
36
37  ~RawPCHContainerGenerator() override = default;
38
39  void HandleTranslationUnit(ASTContext &Ctx) override {
40    if (Buffer->IsComplete) {
41      // Make sure it hits disk now.
42      *OS << Buffer->Data;
43      OS->flush();
44    }
45    // Free the space of the temporary buffer.
46    llvm::SmallVector<char, 0> Empty;
47    Buffer->Data = std::move(Empty);
48  }
49};
50
51} // anonymous namespace
52
53std::unique_ptr<ASTConsumer> RawPCHContainerWriter::CreatePCHContainerGenerator(
54    CompilerInstance &CI, const std::string &MainFileName,
55    const std::string &OutputFileName, std::unique_ptr<llvm::raw_pwrite_stream> OS,
56    std::shared_ptr<PCHBuffer> Buffer) const {
57  return std::make_unique<RawPCHContainerGenerator>(std::move(OS), Buffer);
58}
59
60StringRef
61RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const {
62  return Buffer.getBuffer();
63}
64
65PCHContainerOperations::PCHContainerOperations() {
66  registerWriter(std::make_unique<RawPCHContainerWriter>());
67  registerReader(std::make_unique<RawPCHContainerReader>());
68}
69