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diff --git a/clang-r353983e/include/clang/Lex/CodeCompletionHandler.h b/clang-r353983e/include/clang/Lex/CodeCompletionHandler.h
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+//===--- CodeCompletionHandler.h - Preprocessor code completion -*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+//  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
+
+#include "llvm/ADT/StringRef.h"
+
+namespace clang {
+
+class IdentifierInfo;
+class MacroInfo;
+
+/// Callback handler that receives notifications when performing code
+/// completion within the preprocessor.
+class CodeCompletionHandler {
+public:
+  virtual ~CodeCompletionHandler();
+
+  /// 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) { }
+
+  /// Callback invoked when performing code completion within a block of
+  /// code that was excluded due to preprocessor conditionals.
+  virtual void CodeCompleteInConditionalExclusion() { }
+
+  /// 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) { }
+
+  /// Callback invoked when performing code completion in a preprocessor
+  /// expression, such as the condition of an \#if or \#elif directive.
+  virtual void CodeCompletePreprocessorExpression() { }
+
+  /// Callback invoked when performing code completion inside a
+  /// function-like macro argument.
+  ///
+  /// There will be another callback invocation after the macro arguments are
+  /// parsed, so this callback should generally be used to note that the next
+  /// callback is invoked inside a macro argument.
+  virtual void CodeCompleteMacroArgument(IdentifierInfo *Macro,
+                                         MacroInfo *MacroInfo,
+                                         unsigned ArgumentIndex) { }
+
+  /// Callback invoked when performing code completion inside the filename
+  /// part of an #include directive. (Also #import, #include_next, etc).
+  /// \p Dir is the directory relative to the include path.
+  virtual void CodeCompleteIncludedFile(llvm::StringRef Dir, bool IsAngled) {}
+
+  /// 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