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diff --git a/include/clang/Lex/CodeCompletionHandler.h b/include/clang/Lex/CodeCompletionHandler.h
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+//===--- CodeCompletionHandler.h - Preprocessor code completion -*- 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 CodeCompletionHandler interface, which provides
+//  code-completion callbacks for the preprocessor.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_LEX_CODECOMPLETIONHANDLER_H
+#define LLVM_CLANG_LEX_CODECOMPLETIONHANDLER_H
+
+namespace clang {
+
+class IdentifierInfo;
+class MacroInfo;
+  
+/// \brief Callback handler that receives notifications when performing code 
+/// completion within the preprocessor.
+class CodeCompletionHandler {
+public:
+  virtual ~CodeCompletionHandler();
+  
+  /// \brief Callback invoked when performing code completion for a preprocessor
+  /// directive.
+  ///
+  /// This callback will be invoked when the preprocessor processes a '#' at the
+  /// start of a line, followed by the code-completion token.
+  ///
+  /// \param InConditional Whether we're inside a preprocessor conditional
+  /// already.
+  virtual void CodeCompleteDirective(bool InConditional) { }
+  
+  /// \brief Callback invoked when performing code completion within a block of
+  /// code that was excluded due to preprocessor conditionals.
+  virtual void CodeCompleteInConditionalExclusion() { }
+  
+  /// \brief Callback invoked when performing code completion in a context
+  /// where the name of a macro is expected.
+  ///
+  /// \param IsDefinition Whether this is the definition of a macro, e.g.,
+  /// in a #define.
+  virtual void CodeCompleteMacroName(bool IsDefinition) { }
+  
+  /// \brief Callback invoked when performing code completion in a preprocessor
+  /// expression, such as the condition of an #if or #elif directive.
+  virtual void CodeCompletePreprocessorExpression() { }
+  
+  /// \brief Callback invoked when performing code completion inside a 
+  /// function-like macro argument.
+  virtual void CodeCompleteMacroArgument(IdentifierInfo *Macro,
+                                         MacroInfo *MacroInfo,
+                                         unsigned ArgumentIndex) { }
+
+  /// \brief Callback invoked when performing code completion in a part of the
+  /// file where we expect natural language, e.g., a comment, string, or 
+  /// #error directive.
+  virtual void CodeCompleteNaturalLanguage() { }
+};
+  
+}
+
+#endif // LLVM_CLANG_LEX_CODECOMPLETIONHANDLER_H