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, bool AllowASTWithErrors) 32 : PP(PP), OutputFile(OutputFile), Module(Module), 33 isysroot(isysroot.str()), Out(OS), 34 SemaPtr(nullptr), Stream(Buffer), Writer(Stream), 35 AllowASTWithErrors(AllowASTWithErrors), 36 HasEmittedPCH(false) { 37} 38 39PCHGenerator::~PCHGenerator() { 40} 41 42void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) { 43 // Don't create a PCH if there were fatal failures during module loading. 44 if (PP.getModuleLoader().HadFatalFailure) 45 return; 46 47 bool hasErrors = PP.getDiagnostics().hasErrorOccurred(); 48 if (hasErrors && !AllowASTWithErrors) 49 return; 50 51 // Emit the PCH file 52 assert(SemaPtr && "No Sema?"); 53 Writer.WriteAST(*SemaPtr, OutputFile, Module, isysroot, hasErrors); 54 55 // Write the generated bitstream to "Out". 56 Out->write((char *)&Buffer.front(), Buffer.size()); 57 58 // Make sure it hits disk now. 59 Out->flush(); 60 61 // Free up some memory, in case the process is kept alive. 62 Buffer.clear(); 63 64 HasEmittedPCH = true; 65} 66 67ASTMutationListener *PCHGenerator::GetASTMutationListener() { 68 return &Writer; 69} 70 71ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() { 72 return &Writer; 73} 74