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//===--- GeneratePCH.cpp - Sema Consumer for PCH Generation -----*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file defines the PCHGenerator, which as a SemaConsumer that generates
// a PCH file.
#include "clang/Serialization/ASTWriter.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/Basic/FileManager.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Sema/SemaConsumer.h"
#include "llvm/Bitcode/BitstreamWriter.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
using namespace clang;
PCHGenerator::PCHGenerator(const Preprocessor &PP,
StringRef OutputFile,
clang::Module *Module,
StringRef isysroot,
raw_ostream *OS, bool AllowASTWithErrors)
: PP(PP), OutputFile(OutputFile), Module(Module),
isysroot(isysroot.str()), Out(OS),
SemaPtr(0), Stream(Buffer), Writer(Stream),
HasEmittedPCH(false) {
PCHGenerator::~PCHGenerator() {
void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
// Don't create a PCH if there were fatal failures during module loading.
if (PP.getModuleLoader().HadFatalFailure)
bool hasErrors = PP.getDiagnostics().hasErrorOccurred();
if (hasErrors && !AllowASTWithErrors)
// Emit the PCH file
assert(SemaPtr && "No Sema?");
Writer.WriteAST(*SemaPtr, OutputFile, Module, isysroot, hasErrors);
// Write the generated bitstream to "Out".
Out->write((char *)&Buffer.front(), Buffer.size());
// Make sure it hits disk now.
// Free up some memory, in case the process is kept alive.
HasEmittedPCH = true;
ASTMutationListener *PCHGenerator::GetASTMutationListener() {
return &Writer;
ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
return &Writer;