GeneratePCH.cpp revision 832d620b4ae0fc5fe28561b885b4cfc65cf5c9ab
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 const std::string &OutputFile, 31 bool Chaining, 32 StringRef isysroot, 33 llvm::raw_ostream *OS) 34 : PP(PP), OutputFile(OutputFile), isysroot(isysroot.str()), Out(OS), 35 SemaPtr(0), StatCalls(0), Stream(Buffer), Writer(Stream), Chaining(Chaining) { 36 // Install a stat() listener to keep track of all of the stat() 37 // calls. 38 StatCalls = new MemorizeStatCalls(); 39 // If we have a chain, we want new stat calls only, so install the memorizer 40 // *after* the already installed ASTReader's stat cache. 41 PP.getFileManager().addStatCache(StatCalls, 42 /*AtBeginning=*/!Chaining); 43} 44 45PCHGenerator::~PCHGenerator() { 46} 47 48void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) { 49 if (PP.getDiagnostics().hasErrorOccurred()) 50 return; 51 52 // Set up the serialization listener. 53 Writer.SetSerializationListener(GetASTSerializationListener()); 54 55 // Emit the PCH file 56 assert(SemaPtr && "No Sema?"); 57 Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, isysroot); 58 59 // Write the generated bitstream to "Out". 60 Out->write((char *)&Buffer.front(), Buffer.size()); 61 62 // Make sure it hits disk now. 63 Out->flush(); 64 65 // Free up some memory, in case the process is kept alive. 66 Buffer.clear(); 67} 68 69ASTMutationListener *PCHGenerator::GetASTMutationListener() { 70 if (Chaining) 71 return &Writer; 72 return 0; 73} 74 75ASTSerializationListener *PCHGenerator::GetASTSerializationListener() { 76 return 0; 77} 78 79ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() { 80 return &Writer; 81} 82