1//===--- Frontend/PCHContainerOperations.cpp - PCH Containers ---*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file defines PCHContainerOperations and RawPCHContainerOperation.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Frontend/PCHContainerOperations.h"
15#include "clang/AST/ASTConsumer.h"
16#include "clang/Lex/ModuleLoader.h"
17#include "llvm/Bitcode/BitstreamReader.h"
18#include "llvm/Support/raw_ostream.h"
19#include <utility>
20
21using namespace clang;
22
23PCHContainerWriter::~PCHContainerWriter() {}
24PCHContainerReader::~PCHContainerReader() {}
25
26namespace {
27
28/// \brief A PCHContainerGenerator that writes out the PCH to a flat file.
29class RawPCHContainerGenerator : public ASTConsumer {
30  std::shared_ptr<PCHBuffer> Buffer;
31  raw_pwrite_stream *OS;
32
33public:
34  RawPCHContainerGenerator(llvm::raw_pwrite_stream *OS,
35                           std::shared_ptr<PCHBuffer> Buffer)
36      : Buffer(std::move(Buffer)), OS(OS) {}
37
38  ~RawPCHContainerGenerator() override = default;
39
40  void HandleTranslationUnit(ASTContext &Ctx) override {
41    if (Buffer->IsComplete) {
42      // Make sure it hits disk now.
43      *OS << Buffer->Data;
44      OS->flush();
45    }
46    // Free the space of the temporary buffer.
47    llvm::SmallVector<char, 0> Empty;
48    Buffer->Data = std::move(Empty);
49  }
50};
51
52} // anonymous namespace
53
54std::unique_ptr<ASTConsumer> RawPCHContainerWriter::CreatePCHContainerGenerator(
55    CompilerInstance &CI, const std::string &MainFileName,
56    const std::string &OutputFileName, llvm::raw_pwrite_stream *OS,
57    std::shared_ptr<PCHBuffer> Buffer) const {
58  return llvm::make_unique<RawPCHContainerGenerator>(OS, Buffer);
59}
60
61void RawPCHContainerReader::ExtractPCH(
62    llvm::MemoryBufferRef Buffer, llvm::BitstreamReader &StreamFile) const {
63  StreamFile.init((const unsigned char *)Buffer.getBufferStart(),
64                  (const unsigned char *)Buffer.getBufferEnd());
65}
66
67PCHContainerOperations::PCHContainerOperations() {
68  registerWriter(llvm::make_unique<RawPCHContainerWriter>());
69  registerReader(llvm::make_unique<RawPCHContainerReader>());
70}
71