GeneratePCH.cpp revision 7faa2ec03a7ef120ac165bb45b6c70a8b20c9f1c
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 "llvm/Bitcode/BitstreamWriter.h" 23#include "llvm/Support/raw_ostream.h" 24#include <string> 25 26using namespace clang; 27 28PCHGenerator::PCHGenerator(const Preprocessor &PP, 29 bool Chaining, 30 const char *isysroot, 31 llvm::raw_ostream *OS) 32 : PP(PP), isysroot(isysroot), Out(OS), SemaPtr(0), 33 StatCalls(0), Stream(Buffer), Writer(Stream) { 34 35 // Install a stat() listener to keep track of all of the stat() 36 // calls. 37 StatCalls = new MemorizeStatCalls; 38 // If we have a chain, we want new stat calls only, so install the memorizer 39 // *after* the already installed PCHReader's stat cache. 40 PP.getFileManager().addStatCache(StatCalls, 41 /*AtBeginning=*/!Chaining); 42} 43 44void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) { 45 if (PP.getDiagnostics().hasErrorOccurred()) 46 return; 47 48 // Emit the PCH file 49 assert(SemaPtr && "No Sema?"); 50 Writer.WriteAST(*SemaPtr, StatCalls, isysroot); 51 52 // Write the generated bitstream to "Out". 53 Out->write((char *)&Buffer.front(), Buffer.size()); 54 55 // Make sure it hits disk now. 56 Out->flush(); 57 58 // Free up some memory, in case the process is kept alive. 59 Buffer.clear(); 60} 61 62PCHDeserializationListener *PCHGenerator::GetPCHDeserializationListener() { 63 return &Writer; 64} 65