contrib/llvm/tools/clang/lib/Frontend/ChainedIncludesSource.cpp

   1 //===- ChainedIncludesSource.cpp - Chained PCHs in Memory -------*- 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 ChainedIncludesSource class, which converts headers
  11 //  to chained PCHs in memory, mainly used for testing.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "clang/Frontend/ChainedIncludesSource.h"
  16 #include "clang/Frontend/TextDiagnosticPrinter.h"
  17 #include "clang/Frontend/CompilerInstance.h"
  18 #include "clang/Frontend/ASTUnit.h"
  19 #include "clang/Serialization/ASTReader.h"
  20 #include "clang/Serialization/ASTWriter.h"
  21 #include "clang/Parse/ParseAST.h"
  22 #include "clang/Lex/Preprocessor.h"
  23 #include "clang/Basic/TargetInfo.h"
  24 #include "llvm/Support/MemoryBuffer.h"
  25
  26 using namespace clang;
  27
  28 static ASTReader *createASTReader(CompilerInstance &CI,
  29                                   StringRef pchFile,
  30                                   SmallVector<llvm::MemoryBuffer *, 4> &memBufs,
  31                                   SmallVector<std::string, 4> &bufNames,
  32                              ASTDeserializationListener *deserialListener = 0) {
  33   Preprocessor &PP = CI.getPreprocessor();
  34   OwningPtr<ASTReader> Reader;
  35   Reader.reset(new ASTReader(PP, CI.getASTContext(), /*isysroot=*/"",
  36                              /*DisableValidation=*/true));
  37   for (unsigned ti = 0; ti < bufNames.size(); ++ti) {
  38     StringRef sr(bufNames[ti]);
  39     Reader->addInMemoryBuffer(sr, memBufs[ti]);
  40   }
  41   Reader->setDeserializationListener(deserialListener);
  42   switch (Reader->ReadAST(pchFile, serialization::MK_PCH)) {
  43   case ASTReader::Success:
  44     // Set the predefines buffer as suggested by the PCH reader.
  45     PP.setPredefines(Reader->getSuggestedPredefines());
  46     return Reader.take();
  47
  48   case ASTReader::Failure:
  49   case ASTReader::IgnorePCH:
  50     break;
  51   }
  52   return 0;
  53 }
  54
  55 ChainedIncludesSource::~ChainedIncludesSource() {
  56   for (unsigned i = 0, e = CIs.size(); i != e; ++i)
  57     delete CIs[i];
  58 }
  59
  60 ChainedIncludesSource *ChainedIncludesSource::create(CompilerInstance &CI) {
  61
  62   std::vector<std::string> &includes = CI.getPreprocessorOpts().ChainedIncludes;
  63   assert(!includes.empty() && "No '-chain-include' in options!");
  64
  65   OwningPtr<ChainedIncludesSource> source(new ChainedIncludesSource());
  66   InputKind IK = CI.getFrontendOpts().Inputs[0].Kind;
  67
  68   SmallVector<llvm::MemoryBuffer *, 4> serialBufs;
  69   SmallVector<std::string, 4> serialBufNames;
  70
  71   for (unsigned i = 0, e = includes.size(); i != e; ++i) {
  72     bool firstInclude = (i == 0);
  73     OwningPtr<CompilerInvocation> CInvok;
  74     CInvok.reset(new CompilerInvocation(CI.getInvocation()));
  75
  76     CInvok->getPreprocessorOpts().ChainedIncludes.clear();
  77     CInvok->getPreprocessorOpts().ImplicitPCHInclude.clear();
  78     CInvok->getPreprocessorOpts().ImplicitPTHInclude.clear();
  79     CInvok->getPreprocessorOpts().DisablePCHValidation = true;
  80     CInvok->getPreprocessorOpts().Includes.clear();
  81     CInvok->getPreprocessorOpts().MacroIncludes.clear();
  82     CInvok->getPreprocessorOpts().Macros.clear();
  83
  84     CInvok->getFrontendOpts().Inputs.clear();
  85     CInvok->getFrontendOpts().Inputs.push_back(FrontendInputFile(includes[i],
  86                                                                  IK));
  87
  88     TextDiagnosticPrinter *DiagClient =
  89       new TextDiagnosticPrinter(llvm::errs(), DiagnosticOptions());
  90     IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
  91     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
  92         new DiagnosticsEngine(DiagID, DiagClient));
  93
  94     OwningPtr<CompilerInstance> Clang(new CompilerInstance());
  95     Clang->setInvocation(CInvok.take());
  96     Clang->setDiagnostics(Diags.getPtr());
  97     Clang->setTarget(TargetInfo::CreateTargetInfo(Clang->getDiagnostics(),
  98                                                   Clang->getTargetOpts()));
  99     Clang->createFileManager();
 100     Clang->createSourceManager(Clang->getFileManager());
 101     Clang->createPreprocessor();
 102     Clang->getDiagnosticClient().BeginSourceFile(Clang->getLangOpts(),
 103                                                  &Clang->getPreprocessor());
 104     Clang->createASTContext();
 105
 106     SmallVector<char, 256> serialAST;
 107     llvm::raw_svector_ostream OS(serialAST);
 108     OwningPtr<ASTConsumer> consumer;
 109     consumer.reset(new PCHGenerator(Clang->getPreprocessor(), "-", 0,
 110                                     /*isysroot=*/"", &OS));
 111     Clang->getASTContext().setASTMutationListener(
 112                                             consumer->GetASTMutationListener());
 113     Clang->setASTConsumer(consumer.take());
 114     Clang->createSema(TU_Prefix, 0);
 115
 116     if (firstInclude) {
 117       Preprocessor &PP = Clang->getPreprocessor();
 118       PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
 119                                              PP.getLangOpts());
 120     } else {
 121       assert(!serialBufs.empty());
 122       SmallVector<llvm::MemoryBuffer *, 4> bufs;
 123       for (unsigned si = 0, se = serialBufs.size(); si != se; ++si) {
 124         bufs.push_back(llvm::MemoryBuffer::getMemBufferCopy(
 125                              StringRef(serialBufs[si]->getBufferStart(),
 126                                              serialBufs[si]->getBufferSize())));
 127       }
 128       std::string pchName = includes[i-1];
 129       llvm::raw_string_ostream os(pchName);
 130       os << ".pch" << i-1;
 131       os.flush();
 132
 133       serialBufNames.push_back(pchName);
 134
 135       OwningPtr<ExternalASTSource> Reader;
 136
 137       Reader.reset(createASTReader(*Clang, pchName, bufs, serialBufNames,
 138         Clang->getASTConsumer().GetASTDeserializationListener()));
 139       if (!Reader)
 140         return 0;
 141       Clang->getASTContext().setExternalSource(Reader);
 142     }
 143
 144     if (!Clang->InitializeSourceManager(includes[i]))
 145       return 0;
 146
 147     ParseAST(Clang->getSema());
 148     OS.flush();
 149     Clang->getDiagnosticClient().EndSourceFile();
 150     serialBufs.push_back(
 151       llvm::MemoryBuffer::getMemBufferCopy(StringRef(serialAST.data(),
 152                                                            serialAST.size())));
 153     source->CIs.push_back(Clang.take());
 154   }
 155
 156   assert(!serialBufs.empty());
 157   std::string pchName = includes.back() + ".pch-final";
 158   serialBufNames.push_back(pchName);
 159   OwningPtr<ASTReader> Reader;
 160   Reader.reset(createASTReader(CI, pchName, serialBufs, serialBufNames));
 161   if (!Reader)
 162     return 0;
 163
 164   source->FinalReader.reset(Reader.take());
 165   return source.take();
 166 }
 167
 168 //===----------------------------------------------------------------------===//
 169 // ExternalASTSource interface.
 170 //===----------------------------------------------------------------------===//
 171
 172 Decl *ChainedIncludesSource::GetExternalDecl(uint32_t ID) {
 173   return getFinalReader().GetExternalDecl(ID);
 174 }
 175 Selector ChainedIncludesSource::GetExternalSelector(uint32_t ID) {
 176   return getFinalReader().GetExternalSelector(ID);
 177 }
 178 uint32_t ChainedIncludesSource::GetNumExternalSelectors() {
 179   return getFinalReader().GetNumExternalSelectors();
 180 }
 181 Stmt *ChainedIncludesSource::GetExternalDeclStmt(uint64_t Offset) {
 182   return getFinalReader().GetExternalDeclStmt(Offset);
 183 }
 184 CXXBaseSpecifier *
 185 ChainedIncludesSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
 186   return getFinalReader().GetExternalCXXBaseSpecifiers(Offset);
 187 }
 188 DeclContextLookupResult
 189 ChainedIncludesSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
 190                                                       DeclarationName Name) {
 191   return getFinalReader().FindExternalVisibleDeclsByName(DC, Name);
 192 }
 193 ExternalLoadResult
 194 ChainedIncludesSource::FindExternalLexicalDecls(const DeclContext *DC,
 195                                       bool (*isKindWeWant)(Decl::Kind),
 196                                       SmallVectorImpl<Decl*> &Result) {
 197   return getFinalReader().FindExternalLexicalDecls(DC, isKindWeWant, Result);
 198 }
 199 void ChainedIncludesSource::CompleteType(TagDecl *Tag) {
 200   return getFinalReader().CompleteType(Tag);
 201 }
 202 void ChainedIncludesSource::CompleteType(ObjCInterfaceDecl *Class) {
 203   return getFinalReader().CompleteType(Class);
 204 }
 205 void ChainedIncludesSource::StartedDeserializing() {
 206   return getFinalReader().StartedDeserializing();
 207 }
 208 void ChainedIncludesSource::FinishedDeserializing() {
 209   return getFinalReader().FinishedDeserializing();
 210 }
 211 void ChainedIncludesSource::StartTranslationUnit(ASTConsumer *Consumer) {
 212   return getFinalReader().StartTranslationUnit(Consumer);
 213 }
 214 void ChainedIncludesSource::PrintStats() {
 215   return getFinalReader().PrintStats();
 216 }
 217 void ChainedIncludesSource::getMemoryBufferSizes(MemoryBufferSizes &sizes)const{
 218   for (unsigned i = 0, e = CIs.size(); i != e; ++i) {
 219     if (const ExternalASTSource *eSrc =
 220         CIs[i]->getASTContext().getExternalSource()) {
 221       eSrc->getMemoryBufferSizes(sizes);
 222     }
 223   }
 224
 225   getFinalReader().getMemoryBufferSizes(sizes);
 226 }
 227
 228 void ChainedIncludesSource::InitializeSema(Sema &S) {
 229   return getFinalReader().InitializeSema(S);
 230 }
 231 void ChainedIncludesSource::ForgetSema() {
 232   return getFinalReader().ForgetSema();
 233 }
 234 void ChainedIncludesSource::ReadMethodPool(Selector Sel) {
 235   getFinalReader().ReadMethodPool(Sel);
 236 }
 237 bool ChainedIncludesSource::LookupUnqualified(LookupResult &R, Scope *S) {
 238   return getFinalReader().LookupUnqualified(R, S);
 239 }
 240