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