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 "llvm/Support/raw_ostream.h"
16#include <utility>
17
18using namespace clang;
19
20PCHContainerWriter::~PCHContainerWriter() {}
21PCHContainerReader::~PCHContainerReader() {}
22
23namespace {
24
25/// A PCHContainerGenerator that writes out the PCH to a flat file.
26class RawPCHContainerGenerator : public ASTConsumer {
27 std::shared_ptr<PCHBuffer> Buffer;
28 std::unique_ptr<raw_pwrite_stream> OS;
29
30public:
31 RawPCHContainerGenerator(std::unique_ptr<llvm::raw_pwrite_stream> OS,
32 std::shared_ptr<PCHBuffer> Buffer)
33 : Buffer(std::move(Buffer)), OS(std::move(OS)) {}
34
35 ~RawPCHContainerGenerator() override = default;
36
37 void HandleTranslationUnit(ASTContext &Ctx) override {
38 if (Buffer->IsComplete) {
39 // Make sure it hits disk now.
40 *OS << Buffer->Data;
41 OS->flush();
42 }
43 // Free the space of the temporary buffer.
44 llvm::SmallVector<char, 0> Empty;
45 Buffer->Data = std::move(Empty);
46 }
47};
48
49} // anonymous namespace
50
51std::unique_ptr<ASTConsumer> RawPCHContainerWriter::CreatePCHContainerGenerator(
52 CompilerInstance &CI, const std::string &MainFileName,
53 const std::string &OutputFileName, std::unique_ptr<llvm::raw_pwrite_stream> OS,
54 std::shared_ptr<PCHBuffer> Buffer) const {
55 return std::make_unique<RawPCHContainerGenerator>(args: std::move(OS), args&: Buffer);
56}
57
58ArrayRef<llvm::StringRef> RawPCHContainerReader::getFormats() const {
59 static StringRef Raw("raw");
60 return ArrayRef(Raw);
61}
62
63StringRef
64RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const {
65 return Buffer.getBuffer();
66}
67
68PCHContainerOperations::PCHContainerOperations() {
69 registerWriter(Writer: std::make_unique<RawPCHContainerWriter>());
70 registerReader(Reader: std::make_unique<RawPCHContainerReader>());
71}
72