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//===--- GeneratePCH.cpp - AST 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 CreatePCHGenerate function, which creates an
// ASTConsumer that generates a PCH file.
//
//===----------------------------------------------------------------------===//
#include "clang/Frontend/ASTConsumers.h"
#include "clang/Serialization/ASTWriter.h"
#include "clang/Sema/SemaConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/FileSystemStatCache.h"
#include "llvm/Bitcode/BitstreamWriter.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
using namespace clang;
PCHGenerator::PCHGenerator(const Preprocessor &PP,
const std::string &OutputFile,
bool Chaining,
const char *isysroot,
llvm::raw_ostream *OS)
: PP(PP), OutputFile(OutputFile), isysroot(isysroot), Out(OS), SemaPtr(0),
StatCalls(0), Stream(Buffer), Writer(Stream), Chaining(Chaining) {
// Install a stat() listener to keep track of all of the stat()
// calls.
StatCalls = new MemorizeStatCalls();
// If we have a chain, we want new stat calls only, so install the memorizer
// *after* the already installed ASTReader's stat cache.
PP.getFileManager().addStatCache(StatCalls,
/*AtBeginning=*/!Chaining);
}
void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
if (PP.getDiagnostics().hasErrorOccurred())
return;
// Set up the serialization listener.
Writer.SetSerializationListener(GetASTSerializationListener());
// Emit the PCH file
assert(SemaPtr && "No Sema?");
Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, isysroot);
// Write the generated bitstream to "Out".
Out->write((char *)&Buffer.front(), Buffer.size());
// Make sure it hits disk now.
Out->flush();
// Free up some memory, in case the process is kept alive.
Buffer.clear();
}
ASTMutationListener *PCHGenerator::GetASTMutationListener() {
if (Chaining)
return &Writer;
return 0;
}
ASTSerializationListener *PCHGenerator::GetASTSerializationListener() {
return 0;
}
ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
return &Writer;
}
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