GeneratePCH.cpp revision a8235d6c4093cd38dcf742909651f867de62e55b 
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/Sema/SemaConsumer.h"
17#include "clang/AST/ASTContext.h"
18#include "clang/AST/ASTConsumer.h"
19#include "clang/Lex/Preprocessor.h"
20#include "clang/Basic/FileManager.h"
21#include "clang/Basic/FileSystemStatCache.h"
22#include "llvm/Bitcode/BitstreamWriter.h"
23#include "llvm/Support/raw_ostream.h"
24#include <string>
25
26using namespace clang;
27
28PCHGenerator::PCHGenerator(const Preprocessor &PP,
29                           StringRef OutputFile,
30                           clang::Module *Module,
31                           StringRef isysroot,
32                           raw_ostream *OS)
33  : PP(PP), OutputFile(OutputFile), Module(Module),
34    isysroot(isysroot.str()), Out(OS),
35    SemaPtr(0), StatCalls(0), Stream(Buffer), Writer(Stream) {
36  // Install a stat() listener to keep track of all of the stat()
37  // calls.
38  StatCalls = new MemorizeStatCalls();
39  PP.getFileManager().addStatCache(StatCalls, /*AtBeginning=*/false);
40}
41
42PCHGenerator::~PCHGenerator() {
43}
44
45void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
46  if (PP.getDiagnostics().hasErrorOccurred())
47    return;
48
49  // Emit the PCH file
50  assert(SemaPtr && "No Sema?");
51  Writer.WriteAST(*SemaPtr, StatCalls, OutputFile, Module, isysroot);
52
53  // Write the generated bitstream to "Out".
54  Out->write((char *)&Buffer.front(), Buffer.size());
55
56  // Make sure it hits disk now.
57  Out->flush();
58
59  // Free up some memory, in case the process is kept alive.
60  Buffer.clear();
61}
62
63PPMutationListener *PCHGenerator::GetPPMutationListener() {
64  return &Writer;
65}
66
67ASTMutationListener *PCHGenerator::GetASTMutationListener() {
68  return &Writer;
69}
70
71ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
72  return &Writer;
73}
74