GeneratePCH.cpp revision a8cc6ce36e70e2afa22ab6b4340035cb3941c2eb
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 ModuleMap::Module *Module, 32 StringRef isysroot, 33 raw_ostream *OS) 34 : PP(PP), OutputFile(OutputFile), Module(Module), 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 // Emit the PCH file 51 assert(SemaPtr && "No Sema?"); 52 Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, Module, isysroot); 53 54 // Write the generated bitstream to "Out". 55 Out->write((char *)&Buffer.front(), Buffer.size()); 56 57 // Make sure it hits disk now. 58 Out->flush(); 59 60 // Free up some memory, in case the process is kept alive. 61 Buffer.clear(); 62} 63 64ASTMutationListener *PCHGenerator::GetASTMutationListener() { 65 return &Writer; 66} 67 68ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() { 69 return &Writer; 70} 71