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                           ASTReader::ARR_None)) {
  44   case ASTReader::Success:
  45     // Set the predefines buffer as suggested by the PCH reader.
  46     PP.setPredefines(Reader->getSuggestedPredefines());
  47     return Reader.take();
  48
  49   case ASTReader::Failure:
  50   case ASTReader::OutOfDate:
  51   case ASTReader::VersionMismatch:
  52   case ASTReader::ConfigurationMismatch:
  53   case ASTReader::HadErrors:
  54     break;
  55   }
  56   return 0;
  57 }
  58
  59 ChainedIncludesSource::~ChainedIncludesSource() {
  60   for (unsigned i = 0, e = CIs.size(); i != e; ++i)
  61     delete CIs[i];
  62 }
  63
  64 ChainedIncludesSource *ChainedIncludesSource::create(CompilerInstance &CI) {
  65
  66   std::vector<std::string> &includes = CI.getPreprocessorOpts().ChainedIncludes;
  67   assert(!includes.empty() && "No '-chain-include' in options!");
  68
  69   OwningPtr<ChainedIncludesSource> source(new ChainedIncludesSource());
  70   InputKind IK = CI.getFrontendOpts().Inputs[0].getKind();
  71
  72   SmallVector<llvm::MemoryBuffer *, 4> serialBufs;
  73   SmallVector<std::string, 4> serialBufNames;
  74
  75   for (unsigned i = 0, e = includes.size(); i != e; ++i) {
  76     bool firstInclude = (i == 0);
  77     OwningPtr<CompilerInvocation> CInvok;
  78     CInvok.reset(new CompilerInvocation(CI.getInvocation()));
  79
  80     CInvok->getPreprocessorOpts().ChainedIncludes.clear();
  81     CInvok->getPreprocessorOpts().ImplicitPCHInclude.clear();
  82     CInvok->getPreprocessorOpts().ImplicitPTHInclude.clear();
  83     CInvok->getPreprocessorOpts().DisablePCHValidation = true;
  84     CInvok->getPreprocessorOpts().Includes.clear();
  85     CInvok->getPreprocessorOpts().MacroIncludes.clear();
  86     CInvok->getPreprocessorOpts().Macros.clear();
  87
  88     CInvok->getFrontendOpts().Inputs.clear();
  89     FrontendInputFile InputFile(includes[i], IK);
  90     CInvok->getFrontendOpts().Inputs.push_back(InputFile);
  91
  92     TextDiagnosticPrinter *DiagClient =
  93       new TextDiagnosticPrinter(llvm::errs(), new DiagnosticOptions());
  94     IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
  95     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
  96         new DiagnosticsEngine(DiagID, &CI.getDiagnosticOpts(), DiagClient));
  97
  98     OwningPtr<CompilerInstance> Clang(new CompilerInstance());
  99     Clang->setInvocation(CInvok.take());
 100     Clang->setDiagnostics(Diags.getPtr());
 101     Clang->setTarget(TargetInfo::CreateTargetInfo(Clang->getDiagnostics(),
 102                                                   Clang->getTargetOpts()));
 103     Clang->createFileManager();
 104     Clang->createSourceManager(Clang->getFileManager());
 105     Clang->createPreprocessor();
 106     Clang->getDiagnosticClient().BeginSourceFile(Clang->getLangOpts(),
 107                                                  &Clang->getPreprocessor());
 108     Clang->createASTContext();
 109
 110     SmallVector<char, 256> serialAST;
 111     llvm::raw_svector_ostream OS(serialAST);
 112     OwningPtr<ASTConsumer> consumer;
 113     consumer.reset(new PCHGenerator(Clang->getPreprocessor(), "-", 0,
 114                                     /*isysroot=*/"", &OS));
 115     Clang->getPreprocessor().setPPMutationListener(
 116                                             consumer->GetPPMutationListener());
 117     Clang->getASTContext().setASTMutationListener(
 118                                             consumer->GetASTMutationListener());
 119     Clang->setASTConsumer(consumer.take());
 120     Clang->createSema(TU_Prefix, 0);
 121
 122     if (firstInclude) {
 123       Preprocessor &PP = Clang->getPreprocessor();
 124       PP.getBuiltinInfo().InitializeBuiltins(PP.getIdentifierTable(),
 125                                              PP.getLangOpts());
 126     } else {
 127       assert(!serialBufs.empty());
 128       SmallVector<llvm::MemoryBuffer *, 4> bufs;
 129       for (unsigned si = 0, se = serialBufs.size(); si != se; ++si) {
 130         bufs.push_back(llvm::MemoryBuffer::getMemBufferCopy(
 131                              StringRef(serialBufs[si]->getBufferStart(),
 132                                              serialBufs[si]->getBufferSize())));
 133       }
 134       std::string pchName = includes[i-1];
 135       llvm::raw_string_ostream os(pchName);
 136       os << ".pch" << i-1;
 137       os.flush();
 138
 139       serialBufNames.push_back(pchName);
 140
 141       OwningPtr<ExternalASTSource> Reader;
 142
 143       Reader.reset(createASTReader(*Clang, pchName, bufs, serialBufNames,
 144         Clang->getASTConsumer().GetASTDeserializationListener()));
 145       if (!Reader)
 146         return 0;
 147       Clang->getASTContext().setExternalSource(Reader);
 148     }
 149
 150     if (!Clang->InitializeSourceManager(InputFile))
 151       return 0;
 152
 153     ParseAST(Clang->getSema());
 154     OS.flush();
 155     Clang->getDiagnosticClient().EndSourceFile();
 156     serialBufs.push_back(
 157       llvm::MemoryBuffer::getMemBufferCopy(StringRef(serialAST.data(),
 158                                                            serialAST.size())));
 159     source->CIs.push_back(Clang.take());
 160   }
 161
 162   assert(!serialBufs.empty());
 163   std::string pchName = includes.back() + ".pch-final";
 164   serialBufNames.push_back(pchName);
 165   OwningPtr<ASTReader> Reader;
 166   Reader.reset(createASTReader(CI, pchName, serialBufs, serialBufNames));
 167   if (!Reader)
 168     return 0;
 169
 170   source->FinalReader.reset(Reader.take());
 171   return source.take();
 172 }
 173
 174 //===----------------------------------------------------------------------===//
 175 // ExternalASTSource interface.
 176 //===----------------------------------------------------------------------===//
 177
 178 Decl *ChainedIncludesSource::GetExternalDecl(uint32_t ID) {
 179   return getFinalReader().GetExternalDecl(ID);
 180 }
 181 Selector ChainedIncludesSource::GetExternalSelector(uint32_t ID) {
 182   return getFinalReader().GetExternalSelector(ID);
 183 }
 184 uint32_t ChainedIncludesSource::GetNumExternalSelectors() {
 185   return getFinalReader().GetNumExternalSelectors();
 186 }
 187 Stmt *ChainedIncludesSource::GetExternalDeclStmt(uint64_t Offset) {
 188   return getFinalReader().GetExternalDeclStmt(Offset);
 189 }
 190 CXXBaseSpecifier *
 191 ChainedIncludesSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
 192   return getFinalReader().GetExternalCXXBaseSpecifiers(Offset);
 193 }
 194 DeclContextLookupResult
 195 ChainedIncludesSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
 196                                                       DeclarationName Name) {
 197   return getFinalReader().FindExternalVisibleDeclsByName(DC, Name);
 198 }
 199 ExternalLoadResult
 200 ChainedIncludesSource::FindExternalLexicalDecls(const DeclContext *DC,
 201                                       bool (*isKindWeWant)(Decl::Kind),
 202                                       SmallVectorImpl<Decl*> &Result) {
 203   return getFinalReader().FindExternalLexicalDecls(DC, isKindWeWant, Result);
 204 }
 205 void ChainedIncludesSource::CompleteType(TagDecl *Tag) {
 206   return getFinalReader().CompleteType(Tag);
 207 }
 208 void ChainedIncludesSource::CompleteType(ObjCInterfaceDecl *Class) {
 209   return getFinalReader().CompleteType(Class);
 210 }
 211 void ChainedIncludesSource::StartedDeserializing() {
 212   return getFinalReader().StartedDeserializing();
 213 }
 214 void ChainedIncludesSource::FinishedDeserializing() {
 215   return getFinalReader().FinishedDeserializing();
 216 }
 217 void ChainedIncludesSource::StartTranslationUnit(ASTConsumer *Consumer) {
 218   return getFinalReader().StartTranslationUnit(Consumer);
 219 }
 220 void ChainedIncludesSource::PrintStats() {
 221   return getFinalReader().PrintStats();
 222 }
 223 void ChainedIncludesSource::getMemoryBufferSizes(MemoryBufferSizes &sizes)const{
 224   for (unsigned i = 0, e = CIs.size(); i != e; ++i) {
 225     if (const ExternalASTSource *eSrc =
 226         CIs[i]->getASTContext().getExternalSource()) {
 227       eSrc->getMemoryBufferSizes(sizes);
 228     }
 229   }
 230
 231   getFinalReader().getMemoryBufferSizes(sizes);
 232 }
 233
 234 void ChainedIncludesSource::InitializeSema(Sema &S) {
 235   return getFinalReader().InitializeSema(S);
 236 }
 237 void ChainedIncludesSource::ForgetSema() {
 238   return getFinalReader().ForgetSema();
 239 }
 240 void ChainedIncludesSource::ReadMethodPool(Selector Sel) {
 241   getFinalReader().ReadMethodPool(Sel);
 242 }
 243 bool ChainedIncludesSource::LookupUnqualified(LookupResult &R, Scope *S) {
 244   return getFinalReader().LookupUnqualified(R, S);
 245 }
 246