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1 : //===--- GeneratePCH.cpp - AST 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 CreatePCHGenerate function, which creates an
11 : // ASTConsume that generates a PCH file.
12 : //
13 : //===----------------------------------------------------------------------===//
14 :
15 : #include "clang/Frontend/ASTConsumers.h"
16 : #include "clang/Frontend/PCHWriter.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 "llvm/Bitcode/BitstreamWriter.h"
23 : #include "llvm/Support/raw_ostream.h"
24 : #include <string>
25 :
26 : using namespace clang;
27 :
28 : namespace {
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29 39: class PCHGenerator : public SemaConsumer {
30 : const Preprocessor &PP;
31 : const char *isysroot;
32 : llvm::raw_ostream *Out;
33 : Sema *SemaPtr;
34 : MemorizeStatCalls *StatCalls; // owned by the FileManager
35 :
36 : public:
37 : explicit PCHGenerator(const Preprocessor &PP,
38 : const char *isysroot,
39 : llvm::raw_ostream *Out);
40 44: virtual void InitializeSema(Sema &S) { SemaPtr = &S; }
41 : virtual void HandleTranslationUnit(ASTContext &Ctx);
42 : };
43 : }
44 :
45 : PCHGenerator::PCHGenerator(const Preprocessor &PP,
46 : const char *isysroot,
47 44: llvm::raw_ostream *OS)
48 44: : PP(PP), isysroot(isysroot), Out(OS), SemaPtr(0), StatCalls(0) {
49 :
50 : // Install a stat() listener to keep track of all of the stat()
51 : // calls.
52 44: StatCalls = new MemorizeStatCalls;
53 44: PP.getFileManager().addStatCache(StatCalls, /*AtBeginning=*/true);
54 44: }
55 :
56 44: void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
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57 44: if (PP.getDiagnostics().hasErrorOccurred())
58 0: return;
59 :
60 : // Write the PCH contents into a buffer
61 44: std::vector<unsigned char> Buffer;
62 44: llvm::BitstreamWriter Stream(Buffer);
63 44: PCHWriter Writer(Stream);
64 :
65 : // Emit the PCH file
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66 44: assert(SemaPtr && "No Sema?");
67 44: Writer.WritePCH(*SemaPtr, StatCalls, isysroot);
68 :
69 : // Write the generated bitstream to "Out".
70 44: Out->write((char *)&Buffer.front(), Buffer.size());
71 :
72 : // Make sure it hits disk now.
73 44: Out->flush();
74 : }
75 :
76 : ASTConsumer *clang::CreatePCHGenerator(const Preprocessor &PP,
77 : llvm::raw_ostream *OS,
78 44: const char *isysroot) {
79 44: return new PCHGenerator(PP, isysroot, OS);
80 : }
Generated: 2010-02-10 01:31 by zcov