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diff --git a/include/clang/Index/Indexer.h b/include/clang/Index/Indexer.h
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+++ b/include/clang/Index/Indexer.h
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+//===--- Indexer.h - IndexProvider implementation ---------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  IndexProvider implementation.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_INDEX_INDEXER_H
+#define LLVM_CLANG_INDEX_INDEXER_H
+
+#include "clang/Index/IndexProvider.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include <map>
+
+namespace clang {
+
+namespace idx {
+  class Program;
+  class TranslationUnit;
+
+/// \brief Maps information to TranslationUnits.
+class Indexer : public IndexProvider {
+public:
+  typedef llvm::SmallPtrSet<TranslationUnit *, 4> TUSetTy;
+  typedef std::map<Entity, TUSetTy> MapTy;
+
+  explicit Indexer(Program &prog) : Prog(prog) { }
+
+  Program &getProgram() const { return Prog; }
+
+  /// \brief Find all Entities and map them to the given translation unit.
+  void IndexAST(TranslationUnit *TU);
+
+  virtual void GetTranslationUnitsFor(Entity Ent,
+                                      TranslationUnitHandler *Handler);
+
+  typedef TUSetTy::iterator translation_unit_iterator;
+
+  translation_unit_iterator translation_units_begin(Entity Ent) const;
+  translation_unit_iterator translation_units_end(Entity Ent) const;
+  bool translation_units_empty(Entity Ent) const;
+
+private:
+  Program &Prog;
+  MapTy Map;
+  CtxTUMapTy CtxTUMap;
+};
+
+} // namespace idx
+
+} // namespace clang
+
+#endif