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 20 PCHContainerWriter::~PCHContainerWriter() {} 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: 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 51 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 58 ArrayRef<llvm::StringRef> RawPCHContainerReader::getFormats() const { 59 static StringRef Raw("raw"); 60 return ArrayRef(Raw); 61 } 62 63 StringRef 64 RawPCHContainerReader::ExtractPCH(llvm::MemoryBufferRef Buffer) const { 65 return Buffer.getBuffer(); 66 } 67 68 PCHContainerOperations::PCHContainerOperations() { 69 registerWriter(std::make_unique<RawPCHContainerWriter>()); 70 registerReader(std::make_unique<RawPCHContainerReader>()); 71 } 72