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