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