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 <string>
23
24 using namespace clang;
25
PCHGenerator(const Preprocessor & PP,StringRef OutputFile,clang::Module * Module,StringRef isysroot,std::shared_ptr<PCHBuffer> Buffer,ArrayRef<llvm::IntrusiveRefCntPtr<ModuleFileExtension>> Extensions,bool AllowASTWithErrors,bool IncludeTimestamps)26 PCHGenerator::PCHGenerator(
27 const Preprocessor &PP, StringRef OutputFile,
28 clang::Module *Module, StringRef isysroot,
29 std::shared_ptr<PCHBuffer> Buffer,
30 ArrayRef<llvm::IntrusiveRefCntPtr<ModuleFileExtension>> Extensions,
31 bool AllowASTWithErrors, bool IncludeTimestamps)
32 : PP(PP), OutputFile(OutputFile), Module(Module), isysroot(isysroot.str()),
33 SemaPtr(nullptr), Buffer(Buffer), Stream(Buffer->Data),
34 Writer(Stream, Extensions, IncludeTimestamps),
35 AllowASTWithErrors(AllowASTWithErrors) {
36 Buffer->IsComplete = false;
37 }
38
~PCHGenerator()39 PCHGenerator::~PCHGenerator() {
40 }
41
HandleTranslationUnit(ASTContext & Ctx)42 void PCHGenerator::HandleTranslationUnit(ASTContext &Ctx) {
43 // Don't create a PCH if there were fatal failures during module loading.
44 if (PP.getModuleLoader().HadFatalFailure)
45 return;
46
47 bool hasErrors = PP.getDiagnostics().hasErrorOccurred();
48 if (hasErrors && !AllowASTWithErrors)
49 return;
50
51 // Emit the PCH file to the Buffer.
52 assert(SemaPtr && "No Sema?");
53 Buffer->Signature =
54 Writer.WriteAST(*SemaPtr, OutputFile, Module, isysroot,
55 // For serialization we are lenient if the errors were
56 // only warn-as-error kind.
57 PP.getDiagnostics().hasUncompilableErrorOccurred());
58
59 Buffer->IsComplete = true;
60 }
61
GetASTMutationListener()62 ASTMutationListener *PCHGenerator::GetASTMutationListener() {
63 return &Writer;
64 }
65
GetASTDeserializationListener()66 ASTDeserializationListener *PCHGenerator::GetASTDeserializationListener() {
67 return &Writer;
68 }
69