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
26 using namespace clang;
27
PCHGenerator(const Preprocessor & PP,StringRef OutputFile,clang::Module * Module,StringRef isysroot,raw_ostream * OS)28 PCHGenerator::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
~PCHGenerator()42 PCHGenerator::~PCHGenerator() {
43 }
44
HandleTranslationUnit(ASTContext & Ctx)45 void 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
GetASTMutationListener()63 ASTMutationListener *PCHGenerator::GetASTMutationListener() {
64 return &Writer;
65 }
66
GetASTDeserializationListener()67 ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
68 return &Writer;
69 }
70