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
18 using namespace clang;
19
~PCHContainerWriter()20 PCHContainerWriter::~PCHContainerWriter() {}
~PCHContainerReader()21 PCHContainerReader::~PCHContainerReader() {}
22
23 namespace {
24
25 /// A PCHContainerGenerator that writes out the PCH to a flat file.
26 class RawPCHContainerGenerator : public ASTConsumer {
27 std::shared_ptr<PCHBuffer> Buffer;
28 std::unique_ptr<raw_pwrite_stream> OS;
29
30 public:
RawPCHContainerGenerator(std::unique_ptr<llvm::raw_pwrite_stream> OS,std::shared_ptr<PCHBuffer> Buffer)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
HandleTranslationUnit(ASTContext & Ctx)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
CreatePCHContainerGenerator(CompilerInstance & CI,const std::string & MainFileName,const std::string & OutputFileName,std::unique_ptr<llvm::raw_pwrite_stream> OS,std::shared_ptr<PCHBuffer> Buffer) const51 std::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>(std::move(OS), Buffer);
56 }
57
getFormats() const58 ArrayRef<llvm::StringRef> RawPCHContainerReader::getFormats() const {
59 static StringRef Raw("raw");
60 return ArrayRef(Raw);
61 }
62
63 StringRef
ExtractPCH(llvm::MemoryBufferRef Buffer) const64 RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const {
65 return Buffer.getBuffer();
66 }
67
PCHContainerOperations()68 PCHContainerOperations::PCHContainerOperations() {
69 registerWriter(std::make_unique<RawPCHContainerWriter>());
70 registerReader(std::make_unique<RawPCHContainerReader>());
71 }
72