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