1 files changed, 818 insertions, 0 deletions
diff --git a/clang/tools/libclang/Indexing.cpp b/clang/tools/libclang/Indexing.cpp
new file mode 100644
index 0000000..e660c4d
--- /dev/null
+++ b/clang/tools/libclang/Indexing.cpp
@@ -0,0 +1,818 @@
+//===- CIndexHigh.cpp - Higher level API functions ------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "IndexingContext.h"
+#include "CXCursor.h"
+#include "CXSourceLocation.h"
+#include "CXTranslationUnit.h"
+#include "CXString.h"
+#include "CIndexDiagnostic.h"
+#include "CIndexer.h"
+
+#include "clang/Frontend/ASTUnit.h"
+#include "clang/Frontend/CompilerInvocation.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/FrontendAction.h"
+#include "clang/Frontend/Utils.h"
+#include "clang/Sema/SemaConsumer.h"
+#include "clang/AST/ASTConsumer.h"
+#include "clang/AST/DeclVisitor.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/CrashRecoveryContext.h"
+
+using namespace clang;
+using namespace cxstring;
+using namespace cxtu;
+using namespace cxindex;
+
+static void indexDiagnostics(CXTranslationUnit TU, IndexingContext &IdxCtx);
+
+namespace {
+
+//===----------------------------------------------------------------------===//
+// IndexPPCallbacks
+//===----------------------------------------------------------------------===//
+
+class IndexPPCallbacks : public PPCallbacks {
+  Preprocessor &PP;
+  IndexingContext &IndexCtx;
+  bool IsMainFileEntered;
+
+public:
+  IndexPPCallbacks(Preprocessor &PP, IndexingContext &indexCtx)
+    : PP(PP), IndexCtx(indexCtx), IsMainFileEntered(false) { }
+
+  virtual void FileChanged(SourceLocation Loc, FileChangeReason Reason,
+                          SrcMgr::CharacteristicKind FileType, FileID PrevFID) {
+    if (IsMainFileEntered)
+      return;
+
+    SourceManager &SM = PP.getSourceManager();
+    SourceLocation MainFileLoc = SM.getLocForStartOfFile(SM.getMainFileID());
+
+    if (Loc == MainFileLoc && Reason == PPCallbacks::EnterFile) {
+      IsMainFileEntered = true;
+      IndexCtx.enteredMainFile(SM.getFileEntryForID(SM.getMainFileID()));
+    }
+  }
+
+  virtual void InclusionDirective(SourceLocation HashLoc,
+                                  const Token &IncludeTok,
+                                  StringRef FileName,
+                                  bool IsAngled,
+                                  const FileEntry *File,
+                                  SourceLocation EndLoc,
+                                  StringRef SearchPath,
+                                  StringRef RelativePath) {
+    bool isImport = (IncludeTok.is(tok::identifier) &&
+            IncludeTok.getIdentifierInfo()->getPPKeywordID() == tok::pp_import);
+    IndexCtx.ppIncludedFile(HashLoc, FileName, File, isImport, IsAngled);
+  }
+
+  /// MacroDefined - This hook is called whenever a macro definition is seen.
+  virtual void MacroDefined(const Token &Id, const MacroInfo *MI) {
+  }
+
+  /// MacroUndefined - This hook is called whenever a macro #undef is seen.
+  /// MI is released immediately following this callback.
+  virtual void MacroUndefined(const Token &MacroNameTok, const MacroInfo *MI) {
+  }
+
+  /// MacroExpands - This is called by when a macro invocation is found.
+  virtual void MacroExpands(const Token &MacroNameTok, const MacroInfo* MI,
+                            SourceRange Range) {
+  }
+  
+  /// SourceRangeSkipped - This hook is called when a source range is skipped.
+  /// \param Range The SourceRange that was skipped. The range begins at the
+  /// #if/#else directive and ends after the #endif/#else directive.
+  virtual void SourceRangeSkipped(SourceRange Range) {
+  }
+};
+
+//===----------------------------------------------------------------------===//
+// IndexingConsumer
+//===----------------------------------------------------------------------===//
+
+class IndexingConsumer : public ASTConsumer {
+  IndexingContext &IndexCtx;
+
+public:
+  explicit IndexingConsumer(IndexingContext &indexCtx)
+    : IndexCtx(indexCtx) { }
+
+  // ASTConsumer Implementation
+
+  virtual void Initialize(ASTContext &Context) {
+    IndexCtx.setASTContext(Context);
+    IndexCtx.startedTranslationUnit();
+  }
+
+  virtual void HandleTranslationUnit(ASTContext &Ctx) {
+  }
+
+  virtual bool HandleTopLevelDecl(DeclGroupRef DG) {
+    IndexCtx.indexDeclGroupRef(DG);
+    return !IndexCtx.shouldAbort();
+  }
+
+  /// \brief Handle the specified top-level declaration that occurred inside
+  /// and ObjC container.
+  virtual void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) {
+    // They will be handled after the interface is seen first.
+    IndexCtx.addTUDeclInObjCContainer(D);
+  }
+
+  /// \brief This is called by the AST reader when deserializing things.
+  /// The default implementation forwards to HandleTopLevelDecl but we don't
+  /// care about them when indexing, so have an empty definition.
+  virtual void HandleInterestingDecl(DeclGroupRef D) {}
+
+  virtual void HandleTagDeclDefinition(TagDecl *D) {
+    if (!IndexCtx.shouldIndexImplicitTemplateInsts())
+      return;
+
+    if (IndexCtx.isTemplateImplicitInstantiation(D))
+      IndexCtx.indexDecl(D);
+  }
+
+  virtual void HandleCXXImplicitFunctionInstantiation(FunctionDecl *D) {
+    if (!IndexCtx.shouldIndexImplicitTemplateInsts())
+      return;
+
+    IndexCtx.indexDecl(D);
+  }
+};
+
+//===----------------------------------------------------------------------===//
+// CaptureDiagnosticConsumer
+//===----------------------------------------------------------------------===//
+
+class CaptureDiagnosticConsumer : public DiagnosticConsumer {
+  SmallVector<StoredDiagnostic, 4> Errors;
+public:
+
+  virtual void HandleDiagnostic(DiagnosticsEngine::Level level,
+                                const Diagnostic &Info) {
+    if (level >= DiagnosticsEngine::Error)
+      Errors.push_back(StoredDiagnostic(level, Info));
+  }
+
+  DiagnosticConsumer *clone(DiagnosticsEngine &Diags) const {
+    return new IgnoringDiagConsumer();
+  }
+};
+
+//===----------------------------------------------------------------------===//
+// IndexingFrontendAction
+//===----------------------------------------------------------------------===//
+
+class IndexingFrontendAction : public ASTFrontendAction {
+  IndexingContext IndexCtx;
+  CXTranslationUnit CXTU;
+
+public:
+  IndexingFrontendAction(CXClientData clientData,
+                         IndexerCallbacks &indexCallbacks,
+                         unsigned indexOptions,
+                         CXTranslationUnit cxTU)
+    : IndexCtx(clientData, indexCallbacks, indexOptions, cxTU),
+      CXTU(cxTU) { }
+
+  virtual ASTConsumer *CreateASTConsumer(CompilerInstance &CI,
+                                         StringRef InFile) {
+    IndexCtx.setASTContext(CI.getASTContext());
+    Preprocessor &PP = CI.getPreprocessor();
+    PP.addPPCallbacks(new IndexPPCallbacks(PP, IndexCtx));
+    IndexCtx.setPreprocessor(PP);
+    return new IndexingConsumer(IndexCtx);
+  }
+
+  virtual void EndSourceFileAction() {
+    indexDiagnostics(CXTU, IndexCtx);
+  }
+
+  virtual TranslationUnitKind getTranslationUnitKind() {
+    if (IndexCtx.shouldIndexImplicitTemplateInsts())
+      return TU_Complete;
+    else
+      return TU_Prefix;
+  }
+  virtual bool hasCodeCompletionSupport() const { return false; }
+};
+
+//===----------------------------------------------------------------------===//
+// clang_indexSourceFileUnit Implementation
+//===----------------------------------------------------------------------===//
+
+struct IndexSourceFileInfo {
+  CXIndexAction idxAction;
+  CXClientData client_data;
+  IndexerCallbacks *index_callbacks;
+  unsigned index_callbacks_size;
+  unsigned index_options;
+  const char *source_filename;
+  const char *const *command_line_args;
+  int num_command_line_args;
+  struct CXUnsavedFile *unsaved_files;
+  unsigned num_unsaved_files;
+  CXTranslationUnit *out_TU;
+  unsigned TU_options;
+  int result;
+};
+
+struct MemBufferOwner {
+  SmallVector<const llvm::MemoryBuffer *, 8> Buffers;
+  
+  ~MemBufferOwner() {
+    for (SmallVectorImpl<const llvm::MemoryBuffer *>::iterator
+           I = Buffers.begin(), E = Buffers.end(); I != E; ++I)
+      delete *I;
+  }
+};
+
+} // anonymous namespace
+
+static void clang_indexSourceFile_Impl(void *UserData) {
+  IndexSourceFileInfo *ITUI =
+    static_cast<IndexSourceFileInfo*>(UserData);
+  CXIndex CIdx = (CXIndex)ITUI->idxAction;
+  CXClientData client_data = ITUI->client_data;
+  IndexerCallbacks *client_index_callbacks = ITUI->index_callbacks;
+  unsigned index_callbacks_size = ITUI->index_callbacks_size;
+  unsigned index_options = ITUI->index_options;
+  const char *source_filename = ITUI->source_filename;
+  const char * const *command_line_args = ITUI->command_line_args;
+  int num_command_line_args = ITUI->num_command_line_args;
+  struct CXUnsavedFile *unsaved_files = ITUI->unsaved_files;
+  unsigned num_unsaved_files = ITUI->num_unsaved_files;
+  CXTranslationUnit *out_TU  = ITUI->out_TU;
+  unsigned TU_options = ITUI->TU_options;
+  ITUI->result = 1; // init as error.
+  
+  if (out_TU)
+    *out_TU = 0;
+  bool requestedToGetTU = (out_TU != 0); 
+
+  if (!CIdx)
+    return;
+  if (!client_index_callbacks || index_callbacks_size == 0)
+    return;
+
+  IndexerCallbacks CB;
+  memset(&CB, 0, sizeof(CB));
+  unsigned ClientCBSize = index_callbacks_size < sizeof(CB)
+                                  ? index_callbacks_size : sizeof(CB);
+  memcpy(&CB, client_index_callbacks, ClientCBSize);
+
+  CIndexer *CXXIdx = static_cast<CIndexer *>(CIdx);
+
+  if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForIndexing))
+    setThreadBackgroundPriority();
+
+  CaptureDiagnosticConsumer *CaptureDiag = new CaptureDiagnosticConsumer();
+
+  // Configure the diagnostics.
+  DiagnosticOptions DiagOpts;
+  IntrusiveRefCntPtr<DiagnosticsEngine>
+    Diags(CompilerInstance::createDiagnostics(DiagOpts, num_command_line_args, 
+                                                command_line_args,
+                                                CaptureDiag,
+                                                /*ShouldOwnClient=*/true,
+                                                /*ShouldCloneClient=*/false));
+
+  // Recover resources if we crash before exiting this function.
+  llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,
+    llvm::CrashRecoveryContextReleaseRefCleanup<DiagnosticsEngine> >
+    DiagCleanup(Diags.getPtr());
+  
+  OwningPtr<std::vector<const char *> >
+    Args(new std::vector<const char*>());
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<std::vector<const char*> >
+    ArgsCleanup(Args.get());
+  
+  Args->insert(Args->end(), command_line_args,
+               command_line_args + num_command_line_args);
+
+  // The 'source_filename' argument is optional.  If the caller does not
+  // specify it then it is assumed that the source file is specified
+  // in the actual argument list.
+  // Put the source file after command_line_args otherwise if '-x' flag is
+  // present it will be unused.
+  if (source_filename)
+    Args->push_back(source_filename);
+  
+  IntrusiveRefCntPtr<CompilerInvocation>
+    CInvok(createInvocationFromCommandLine(*Args, Diags));
+
+  if (!CInvok)
+    return;
+
+  // Recover resources if we crash before exiting this function.
+  llvm::CrashRecoveryContextCleanupRegistrar<CompilerInvocation,
+    llvm::CrashRecoveryContextReleaseRefCleanup<CompilerInvocation> >
+    CInvokCleanup(CInvok.getPtr());
+
+  if (CInvok->getFrontendOpts().Inputs.empty())
+    return;
+
+  OwningPtr<MemBufferOwner> BufOwner(new MemBufferOwner());
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<MemBufferOwner>
+    BufOwnerCleanup(BufOwner.get());
+
+  for (unsigned I = 0; I != num_unsaved_files; ++I) {
+    StringRef Data(unsaved_files[I].Contents, unsaved_files[I].Length);
+    const llvm::MemoryBuffer *Buffer
+      = llvm::MemoryBuffer::getMemBufferCopy(Data, unsaved_files[I].Filename);
+    CInvok->getPreprocessorOpts().addRemappedFile(unsaved_files[I].Filename, Buffer);
+    BufOwner->Buffers.push_back(Buffer);
+  }
+
+  // Since libclang is primarily used by batch tools dealing with
+  // (often very broken) source code, where spell-checking can have a
+  // significant negative impact on performance (particularly when 
+  // precompiled headers are involved), we disable it.
+  CInvok->getLangOpts()->SpellChecking = false;
+
+  if (!requestedToGetTU)
+    CInvok->getPreprocessorOpts().DetailedRecord = false;
+
+  if (index_options & CXIndexOpt_SuppressWarnings)
+    CInvok->getDiagnosticOpts().IgnoreWarnings = true;
+
+  ASTUnit *Unit = ASTUnit::create(CInvok.getPtr(), Diags,
+                                  /*CaptureDiagnostics=*/true);
+  OwningPtr<CXTUOwner> CXTU(new CXTUOwner(MakeCXTranslationUnit(CXXIdx, Unit)));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<CXTUOwner>
+    CXTUCleanup(CXTU.get());
+
+  OwningPtr<IndexingFrontendAction> IndexAction;
+  IndexAction.reset(new IndexingFrontendAction(client_data, CB,
+                                               index_options, CXTU->getTU()));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<IndexingFrontendAction>
+    IndexActionCleanup(IndexAction.get());
+
+  bool Persistent = requestedToGetTU;
+  StringRef ResourceFilesPath = CXXIdx->getClangResourcesPath();
+  bool OnlyLocalDecls = false;
+  bool PrecompilePreamble = false;
+  bool CacheCodeCompletionResults = false;
+  PreprocessorOptions &PPOpts = CInvok->getPreprocessorOpts(); 
+  PPOpts.DetailedRecord = false;
+  PPOpts.AllowPCHWithCompilerErrors = true;
+
+  if (requestedToGetTU) {
+    OnlyLocalDecls = CXXIdx->getOnlyLocalDecls();
+    PrecompilePreamble = TU_options & CXTranslationUnit_PrecompiledPreamble;
+    // FIXME: Add a flag for modules.
+    CacheCodeCompletionResults
+      = TU_options & CXTranslationUnit_CacheCompletionResults;
+    if (TU_options & CXTranslationUnit_DetailedPreprocessingRecord) {
+      PPOpts.DetailedRecord = true;
+    }
+  }
+
+  DiagnosticErrorTrap DiagTrap(*Diags);
+  bool Success = ASTUnit::LoadFromCompilerInvocationAction(CInvok.getPtr(), Diags,
+                                                       IndexAction.get(),
+                                                       Unit,
+                                                       Persistent,
+                                                       ResourceFilesPath,
+                                                       OnlyLocalDecls,
+                                                    /*CaptureDiagnostics=*/true,
+                                                       PrecompilePreamble,
+                                                    CacheCodeCompletionResults);
+  if (DiagTrap.hasErrorOccurred() && CXXIdx->getDisplayDiagnostics())
+    printDiagsToStderr(Unit);
+
+  if (!Success)
+    return;
+
+  if (out_TU)
+    *out_TU = CXTU->takeTU();
+
+  ITUI->result = 0; // success.
+}
+
+//===----------------------------------------------------------------------===//
+// clang_indexTranslationUnit Implementation
+//===----------------------------------------------------------------------===//
+
+namespace {
+
+struct IndexTranslationUnitInfo {
+  CXIndexAction idxAction;
+  CXClientData client_data;
+  IndexerCallbacks *index_callbacks;
+  unsigned index_callbacks_size;
+  unsigned index_options;
+  CXTranslationUnit TU;
+  int result;
+};
+
+} // anonymous namespace
+
+static void indexPreprocessingRecord(ASTUnit &Unit, IndexingContext &IdxCtx) {
+  Preprocessor &PP = Unit.getPreprocessor();
+  if (!PP.getPreprocessingRecord())
+    return;
+
+  PreprocessingRecord &PPRec = *PP.getPreprocessingRecord();
+
+  // FIXME: Only deserialize inclusion directives.
+  // FIXME: Only deserialize stuff from the last chained PCH, not the PCH/Module
+  // that it depends on.
+
+  bool OnlyLocal = !Unit.isMainFileAST() && Unit.getOnlyLocalDecls();
+  PreprocessingRecord::iterator I, E;
+  if (OnlyLocal) {
+    I = PPRec.local_begin();
+    E = PPRec.local_end();
+  } else {
+    I = PPRec.begin();
+    E = PPRec.end();
+  }
+
+  for (; I != E; ++I) {
+    PreprocessedEntity *PPE = *I;
+
+    if (InclusionDirective *ID = dyn_cast<InclusionDirective>(PPE)) {
+      IdxCtx.ppIncludedFile(ID->getSourceRange().getBegin(), ID->getFileName(),
+                     ID->getFile(), ID->getKind() == InclusionDirective::Import,
+                     !ID->wasInQuotes());
+    }
+  }
+}
+
+static void indexTranslationUnit(ASTUnit &Unit, IndexingContext &IdxCtx) {
+  // FIXME: Only deserialize stuff from the last chained PCH, not the PCH/Module
+  // that it depends on.
+
+  bool OnlyLocal = !Unit.isMainFileAST() && Unit.getOnlyLocalDecls();
+
+  if (OnlyLocal) {
+    for (ASTUnit::top_level_iterator TL = Unit.top_level_begin(),
+                                  TLEnd = Unit.top_level_end();
+           TL != TLEnd; ++TL) {
+      IdxCtx.indexTopLevelDecl(*TL);
+      if (IdxCtx.shouldAbort())
+        return;
+    }
+
+  } else {
+    TranslationUnitDecl *TUDecl = Unit.getASTContext().getTranslationUnitDecl();
+    for (TranslationUnitDecl::decl_iterator
+           I = TUDecl->decls_begin(), E = TUDecl->decls_end(); I != E; ++I) {
+      IdxCtx.indexTopLevelDecl(*I);
+      if (IdxCtx.shouldAbort())
+        return;
+    }
+  }
+}
+
+static void indexDiagnostics(CXTranslationUnit TU, IndexingContext &IdxCtx) {
+  if (!IdxCtx.hasDiagnosticCallback())
+    return;
+
+  CXDiagnosticSetImpl *DiagSet = cxdiag::lazyCreateDiags(TU);
+  IdxCtx.handleDiagnosticSet(DiagSet);
+}
+
+static void clang_indexTranslationUnit_Impl(void *UserData) {
+  IndexTranslationUnitInfo *ITUI =
+    static_cast<IndexTranslationUnitInfo*>(UserData);
+  CXTranslationUnit TU = ITUI->TU;
+  CXClientData client_data = ITUI->client_data;
+  IndexerCallbacks *client_index_callbacks = ITUI->index_callbacks;
+  unsigned index_callbacks_size = ITUI->index_callbacks_size;
+  unsigned index_options = ITUI->index_options;
+  ITUI->result = 1; // init as error.
+
+  if (!TU)
+    return;
+  if (!client_index_callbacks || index_callbacks_size == 0)
+    return;
+
+  CIndexer *CXXIdx = (CIndexer*)TU->CIdx;
+  if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForIndexing))
+    setThreadBackgroundPriority();
+
+  IndexerCallbacks CB;
+  memset(&CB, 0, sizeof(CB));
+  unsigned ClientCBSize = index_callbacks_size < sizeof(CB)
+                                  ? index_callbacks_size : sizeof(CB);
+  memcpy(&CB, client_index_callbacks, ClientCBSize);
+
+  OwningPtr<IndexingContext> IndexCtx;
+  IndexCtx.reset(new IndexingContext(client_data, CB, index_options, TU));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<IndexingContext>
+    IndexCtxCleanup(IndexCtx.get());
+
+  OwningPtr<IndexingConsumer> IndexConsumer;
+  IndexConsumer.reset(new IndexingConsumer(*IndexCtx));
+
+  // Recover resources if we crash before exiting this method.
+  llvm::CrashRecoveryContextCleanupRegistrar<IndexingConsumer>
+    IndexConsumerCleanup(IndexConsumer.get());
+
+  ASTUnit *Unit = static_cast<ASTUnit *>(TU->TUData);
+  if (!Unit)
+    return;
+
+  FileManager &FileMgr = Unit->getFileManager();
+
+  if (Unit->getOriginalSourceFileName().empty())
+    IndexCtx->enteredMainFile(0);
+  else
+    IndexCtx->enteredMainFile(FileMgr.getFile(Unit->getOriginalSourceFileName()));
+
+  IndexConsumer->Initialize(Unit->getASTContext());
+
+  indexPreprocessingRecord(*Unit, *IndexCtx);
+  indexTranslationUnit(*Unit, *IndexCtx);
+  indexDiagnostics(TU, *IndexCtx);
+
+  ITUI->result = 0;
+}
+
+//===----------------------------------------------------------------------===//
+// libclang public APIs.
+//===----------------------------------------------------------------------===//
+
+extern "C" {
+
+int clang_index_isEntityObjCContainerKind(CXIdxEntityKind K) {
+  return CXIdxEntity_ObjCClass <= K && K <= CXIdxEntity_ObjCCategory;
+}
+
+const CXIdxObjCContainerDeclInfo *
+clang_index_getObjCContainerDeclInfo(const CXIdxDeclInfo *DInfo) {
+  if (!DInfo)
+    return 0;
+
+  const DeclInfo *DI = static_cast<const DeclInfo *>(DInfo);
+  if (const ObjCContainerDeclInfo *
+        ContInfo = dyn_cast<ObjCContainerDeclInfo>(DI))
+    return &ContInfo->ObjCContDeclInfo;
+
+  return 0;
+}
+
+const CXIdxObjCInterfaceDeclInfo *
+clang_index_getObjCInterfaceDeclInfo(const CXIdxDeclInfo *DInfo) {
+  if (!DInfo)
+    return 0;
+
+  const DeclInfo *DI = static_cast<const DeclInfo *>(DInfo);
+  if (const ObjCInterfaceDeclInfo *
+        InterInfo = dyn_cast<ObjCInterfaceDeclInfo>(DI))
+    return &InterInfo->ObjCInterDeclInfo;
+
+  return 0;
+}
+
+const CXIdxObjCCategoryDeclInfo *
+clang_index_getObjCCategoryDeclInfo(const CXIdxDeclInfo *DInfo){
+  if (!DInfo)
+    return 0;
+
+  const DeclInfo *DI = static_cast<const DeclInfo *>(DInfo);
+  if (const ObjCCategoryDeclInfo *
+        CatInfo = dyn_cast<ObjCCategoryDeclInfo>(DI))
+    return &CatInfo->ObjCCatDeclInfo;
+
+  return 0;
+}
+
+const CXIdxObjCProtocolRefListInfo *
+clang_index_getObjCProtocolRefListInfo(const CXIdxDeclInfo *DInfo) {
+  if (!DInfo)
+    return 0;
+
+  const DeclInfo *DI = static_cast<const DeclInfo *>(DInfo);
+  
+  if (const ObjCInterfaceDeclInfo *
+        InterInfo = dyn_cast<ObjCInterfaceDeclInfo>(DI))
+    return InterInfo->ObjCInterDeclInfo.protocols;
+  
+  if (const ObjCProtocolDeclInfo *
+        ProtInfo = dyn_cast<ObjCProtocolDeclInfo>(DI))
+    return &ProtInfo->ObjCProtoRefListInfo;
+
+  if (const ObjCCategoryDeclInfo *CatInfo = dyn_cast<ObjCCategoryDeclInfo>(DI))
+    return CatInfo->ObjCCatDeclInfo.protocols;
+
+  return 0;
+}
+
+const CXIdxObjCPropertyDeclInfo *
+clang_index_getObjCPropertyDeclInfo(const CXIdxDeclInfo *DInfo) {
+  if (!DInfo)
+    return 0;
+
+  const DeclInfo *DI = static_cast<const DeclInfo *>(DInfo);
+  if (const ObjCPropertyDeclInfo *PropInfo = dyn_cast<ObjCPropertyDeclInfo>(DI))
+    return &PropInfo->ObjCPropDeclInfo;
+
+  return 0;
+}
+
+const CXIdxIBOutletCollectionAttrInfo *
+clang_index_getIBOutletCollectionAttrInfo(const CXIdxAttrInfo *AInfo) {
+  if (!AInfo)
+    return 0;
+
+  const AttrInfo *DI = static_cast<const AttrInfo *>(AInfo);
+  if (const IBOutletCollectionInfo *
+        IBInfo = dyn_cast<IBOutletCollectionInfo>(DI))
+    return &IBInfo->IBCollInfo;
+
+  return 0;
+}
+
+const CXIdxCXXClassDeclInfo *
+clang_index_getCXXClassDeclInfo(const CXIdxDeclInfo *DInfo) {
+  if (!DInfo)
+    return 0;
+
+  const DeclInfo *DI = static_cast<const DeclInfo *>(DInfo);
+  if (const CXXClassDeclInfo *ClassInfo = dyn_cast<CXXClassDeclInfo>(DI))
+    return &ClassInfo->CXXClassInfo;
+
+  return 0;
+}
+
+CXIdxClientContainer
+clang_index_getClientContainer(const CXIdxContainerInfo *info) {
+  if (!info)
+    return 0;
+  const ContainerInfo *Container = static_cast<const ContainerInfo *>(info);
+  return Container->IndexCtx->getClientContainerForDC(Container->DC);
+}
+
+void clang_index_setClientContainer(const CXIdxContainerInfo *info,
+                                    CXIdxClientContainer client) {
+  if (!info)
+    return;
+  const ContainerInfo *Container = static_cast<const ContainerInfo *>(info);
+  Container->IndexCtx->addContainerInMap(Container->DC, client);
+}
+
+CXIdxClientEntity clang_index_getClientEntity(const CXIdxEntityInfo *info) {
+  if (!info)
+    return 0;
+  const EntityInfo *Entity = static_cast<const EntityInfo *>(info);
+  return Entity->IndexCtx->getClientEntity(Entity->Dcl);
+}
+
+void clang_index_setClientEntity(const CXIdxEntityInfo *info,
+                                 CXIdxClientEntity client) {
+  if (!info)
+    return;
+  const EntityInfo *Entity = static_cast<const EntityInfo *>(info);
+  Entity->IndexCtx->setClientEntity(Entity->Dcl, client);
+}
+
+CXIndexAction clang_IndexAction_create(CXIndex CIdx) {
+  // For now, CXIndexAction is featureless. 
+  return CIdx;
+}
+
+void clang_IndexAction_dispose(CXIndexAction idxAction) {
+  // For now, CXIndexAction is featureless. 
+}
+
+int clang_indexSourceFile(CXIndexAction idxAction,
+                          CXClientData client_data,
+                          IndexerCallbacks *index_callbacks,
+                          unsigned index_callbacks_size,
+                          unsigned index_options,
+                          const char *source_filename,
+                          const char * const *command_line_args,
+                          int num_command_line_args,
+                          struct CXUnsavedFile *unsaved_files,
+                          unsigned num_unsaved_files,
+                          CXTranslationUnit *out_TU,
+                          unsigned TU_options) {
+
+  IndexSourceFileInfo ITUI = { idxAction, client_data, index_callbacks,
+                               index_callbacks_size, index_options,
+                               source_filename, command_line_args,
+                               num_command_line_args, unsaved_files,
+                               num_unsaved_files, out_TU, TU_options, 0 };
+
+  if (getenv("LIBCLANG_NOTHREADS")) {
+    clang_indexSourceFile_Impl(&ITUI);
+    return ITUI.result;
+  }
+
+  llvm::CrashRecoveryContext CRC;
+
+  if (!RunSafely(CRC, clang_indexSourceFile_Impl, &ITUI)) {
+    fprintf(stderr, "libclang: crash detected during indexing source file: {\n");
+    fprintf(stderr, "  'source_filename' : '%s'\n", source_filename);
+    fprintf(stderr, "  'command_line_args' : [");
+    for (int i = 0; i != num_command_line_args; ++i) {
+      if (i)
+        fprintf(stderr, ", ");
+      fprintf(stderr, "'%s'", command_line_args[i]);
+    }
+    fprintf(stderr, "],\n");
+    fprintf(stderr, "  'unsaved_files' : [");
+    for (unsigned i = 0; i != num_unsaved_files; ++i) {
+      if (i)
+        fprintf(stderr, ", ");
+      fprintf(stderr, "('%s', '...', %ld)", unsaved_files[i].Filename,
+              unsaved_files[i].Length);
+    }
+    fprintf(stderr, "],\n");
+    fprintf(stderr, "  'options' : %d,\n", TU_options);
+    fprintf(stderr, "}\n");
+    
+    return 1;
+  } else if (getenv("LIBCLANG_RESOURCE_USAGE")) {
+    if (out_TU)
+      PrintLibclangResourceUsage(*out_TU);
+  }
+  
+  return ITUI.result;
+}
+
+int clang_indexTranslationUnit(CXIndexAction idxAction,
+                               CXClientData client_data,
+                               IndexerCallbacks *index_callbacks,
+                               unsigned index_callbacks_size,
+                               unsigned index_options,
+                               CXTranslationUnit TU) {
+
+  IndexTranslationUnitInfo ITUI = { idxAction, client_data, index_callbacks,
+                                    index_callbacks_size, index_options, TU,
+                                    0 };
+
+  if (getenv("LIBCLANG_NOTHREADS")) {
+    clang_indexTranslationUnit_Impl(&ITUI);
+    return ITUI.result;
+  }
+
+  llvm::CrashRecoveryContext CRC;
+
+  if (!RunSafely(CRC, clang_indexTranslationUnit_Impl, &ITUI)) {
+    fprintf(stderr, "libclang: crash detected during indexing TU\n");
+    
+    return 1;
+  }
+
+  return ITUI.result;
+}
+
+void clang_indexLoc_getFileLocation(CXIdxLoc location,
+                                    CXIdxClientFile *indexFile,
+                                    CXFile *file,
+                                    unsigned *line,
+                                    unsigned *column,
+                                    unsigned *offset) {
+  if (indexFile) *indexFile = 0;
+  if (file)   *file = 0;
+  if (line)   *line = 0;
+  if (column) *column = 0;
+  if (offset) *offset = 0;
+
+  SourceLocation Loc = SourceLocation::getFromRawEncoding(location.int_data);
+  if (!location.ptr_data[0] || Loc.isInvalid())
+    return;
+
+  IndexingContext &IndexCtx =
+      *static_cast<IndexingContext*>(location.ptr_data[0]);
+  IndexCtx.translateLoc(Loc, indexFile, file, line, column, offset);
+}
+
+CXSourceLocation clang_indexLoc_getCXSourceLocation(CXIdxLoc location) {
+  SourceLocation Loc = SourceLocation::getFromRawEncoding(location.int_data);
+  if (!location.ptr_data[0] || Loc.isInvalid())
+    return clang_getNullLocation();
+
+  IndexingContext &IndexCtx =
+      *static_cast<IndexingContext*>(location.ptr_data[0]);
+  return cxloc::translateSourceLocation(IndexCtx.getASTContext(), Loc);
+}
+
+} // end: extern "C"
+