1 //===--- GeneratePCH.cpp - AST Consumer for PCH Generation ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the CreatePCHGenerate function, which creates an
11 // ASTConsumer that generates a PCH file.
13 //===----------------------------------------------------------------------===//
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"
27 using namespace clang;
29 PCHGenerator::PCHGenerator(const Preprocessor &PP,
30 const std::string &OutputFile,
33 llvm::raw_ostream *OS)
34 : PP(PP), OutputFile(OutputFile), isysroot(isysroot), Out(OS), SemaPtr(0),
35 StatCalls(0), Stream(Buffer), Writer(Stream), Chaining(Chaining) {
36 // Install a stat() listener to keep track of all of the stat()
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);
45 void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
46 if (PP.getDiagnostics().hasErrorOccurred())
49 // Set up the serialization listener.
50 Writer.SetSerializationListener(GetASTSerializationListener());
53 assert(SemaPtr && "No Sema?");
54 Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, isysroot);
56 // Write the generated bitstream to "Out".
57 Out->write((char *)&Buffer.front(), Buffer.size());
59 // Make sure it hits disk now.
62 // Free up some memory, in case the process is kept alive.
66 ASTMutationListener *PCHGenerator::GetASTMutationListener() {
72 ASTSerializationListener *PCHGenerator::GetASTSerializationListener() {
76 ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {