GeneratePCH.cpp revision 7143aab97c6e849a5a5005b7853b8c7d5af008ed
1//===--- GeneratePCH.cpp - AST Consumer for PCH Generation ------*- 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 the CreatePCHGenerate function, which creates an 11// ASTConsumer that generates a PCH file. 12// 13//===----------------------------------------------------------------------===// 14 15#include "clang/Frontend/ASTConsumers.h" 16#include "clang/Serialization/ASTWriter.h" 17#include "clang/Sema/SemaConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/Lex/Preprocessor.h" 21#include "clang/Basic/FileManager.h" 22#include "clang/Basic/FileSystemStatCache.h" 23#include "llvm/Bitcode/BitstreamWriter.h" 24#include "llvm/Support/raw_ostream.h" 25#include <string> 26 27using namespace clang; 28 29PCHGenerator::PCHGenerator(const Preprocessor &PP, 30 StringRef OutputFile, 31 bool IsModule, 32 StringRef isysroot, 33 raw_ostream *OS) 34 : PP(PP), OutputFile(OutputFile), IsModule(IsModule), 35 isysroot(isysroot.str()), Out(OS), 36 SemaPtr(0), StatCalls(0), Stream(Buffer), Writer(Stream) { 37 // Install a stat() listener to keep track of all of the stat() 38 // calls. 39 StatCalls = new MemorizeStatCalls(); 40 PP.getFileManager().addStatCache(StatCalls, /*AtBeginning=*/false); 41} 42 43PCHGenerator::~PCHGenerator() { 44} 45 46void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) { 47 if (PP.getDiagnostics().hasErrorOccurred()) 48 return; 49 50 // Set up the serialization listener. 51 Writer.SetSerializationListener(GetASTSerializationListener()); 52 53 // Emit the PCH file 54 assert(SemaPtr && "No Sema?"); 55 Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, IsModule, isysroot); 56 57 // Write the generated bitstream to "Out". 58 Out->write((char *)&Buffer.front(), Buffer.size()); 59 60 // Make sure it hits disk now. 61 Out->flush(); 62 63 // Free up some memory, in case the process is kept alive. 64 Buffer.clear(); 65} 66 67ASTMutationListener *PCHGenerator::GetASTMutationListener() { 68 return &Writer; 69} 70 71ASTSerializationListener *PCHGenerator::GetASTSerializationListener() { 72 return 0; 73} 74 75ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() { 76 return &Writer; 77} 78