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      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 
    241