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diff --git a/clang/include/clang/Sema/SemaConsumer.h b/clang/include/clang/Sema/SemaConsumer.h
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+++ b/clang/include/clang/Sema/SemaConsumer.h
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+//===--- SemaConsumer.h - Abstract interface for AST semantics --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the SemaConsumer class, a subclass of
+//  ASTConsumer that is used by AST clients that also require
+//  additional semantic analysis.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_SEMA_SEMACONSUMER_H
+#define LLVM_CLANG_SEMA_SEMACONSUMER_H
+
+#include "clang/AST/ASTConsumer.h"
+
+namespace clang {
+  class Sema;
+
+  /// \brief An abstract interface that should be implemented by
+  /// clients that read ASTs and then require further semantic
+  /// analysis of the entities in those ASTs.
+  class SemaConsumer : public ASTConsumer {
+    virtual void anchor();
+  public:
+    SemaConsumer() {
+      ASTConsumer::SemaConsumer = true;
+    }
+
+    /// \brief Initialize the semantic consumer with the Sema instance
+    /// being used to perform semantic analysis on the abstract syntax
+    /// tree.
+    virtual void InitializeSema(Sema &S) {}
+
+    /// \brief Inform the semantic consumer that Sema is no longer available.
+    virtual void ForgetSema() {}
+
+    // isa/cast/dyn_cast support
+    static bool classof(const ASTConsumer *Consumer) {
+      return Consumer->SemaConsumer;
+    }
+    static bool classof(const SemaConsumer *) { return true; }
+  };
+}
+
+#endif