1//===--- GeneratePCH.cpp - Sema 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 PCHGenerator, which as a SemaConsumer that generates 11// a PCH file. 12// 13//===----------------------------------------------------------------------===// 14 15#include "clang/Serialization/ASTWriter.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/Basic/FileManager.h" 19#include "clang/Lex/Preprocessor.h" 20#include "clang/Sema/SemaConsumer.h" 21#include "llvm/Bitcode/BitstreamWriter.h" 22#include "llvm/Support/raw_ostream.h" 23#include <string> 24 25using namespace clang; 26 27PCHGenerator::PCHGenerator(const Preprocessor &PP, 28 StringRef OutputFile, 29 clang::Module *Module, 30 StringRef isysroot, 31 raw_ostream *OS) 32 : PP(PP), OutputFile(OutputFile), Module(Module), 33 isysroot(isysroot.str()), Out(OS), 34 SemaPtr(0), Stream(Buffer), Writer(Stream) { 35} 36 37PCHGenerator::~PCHGenerator() { 38} 39 40void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) { 41 if (PP.getDiagnostics().hasErrorOccurred()) 42 return; 43 44 // Emit the PCH file 45 assert(SemaPtr && "No Sema?"); 46 Writer.WriteAST(*SemaPtr, OutputFile, Module, isysroot); 47 48 // Write the generated bitstream to "Out". 49 Out->write((char *)&Buffer.front(), Buffer.size()); 50 51 // Make sure it hits disk now. 52 Out->flush(); 53 54 // Free up some memory, in case the process is kept alive. 55 Buffer.clear(); 56} 57 58PPMutationListener *PCHGenerator::GetPPMutationListener() { 59 return &Writer; 60} 61 62ASTMutationListener *PCHGenerator::GetASTMutationListener() { 63 return &Writer; 64} 65 66ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() { 67 return &Writer; 68} 69