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 20 using namespace clang; 21 22 PCHContainerWriter::~PCHContainerWriter() {} 23 PCHContainerReader::~PCHContainerReader() {} 24 25 namespace { 26 27 /// A PCHContainerGenerator that writes out the PCH to a flat file. 28 class RawPCHContainerGenerator : public ASTConsumer { 29 std::shared_ptr<PCHBuffer> Buffer; 30 std::unique_ptr<raw_pwrite_stream> OS; 31 32 public: 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 53 std::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 60 ArrayRef<llvm::StringRef> RawPCHContainerReader::getFormats() const { 61 static StringRef Raw("raw"); 62 return ArrayRef(Raw); 63 } 64 65 StringRef 66 RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const { 67 return Buffer.getBuffer(); 68 } 69 70 PCHContainerOperations::PCHContainerOperations() { 71 registerWriter(std::make_unique<RawPCHContainerWriter>()); 72 registerReader(std::make_unique<RawPCHContainerReader>()); 73 } 74