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diff --git a/clang/lib/AST/CXXABI.h b/clang/lib/AST/CXXABI.h
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+++ b/clang/lib/AST/CXXABI.h
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+//===----- CXXABI.h - Interface to C++ ABIs ---------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This provides an abstract class for C++ AST support. Concrete
+// subclasses of this implement AST support for specific C++ ABIs.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_CXXABI_H
+#define LLVM_CLANG_AST_CXXABI_H
+
+#include "clang/AST/Type.h"
+
+namespace clang {
+
+class ASTContext;
+class MemberPointerType;
+
+/// Implements C++ ABI-specific semantic analysis functions.
+class CXXABI {
+public:
+  virtual ~CXXABI();
+
+  /// Returns the size of a member pointer in multiples of the target
+  /// pointer size.
+  virtual unsigned getMemberPointerSize(const MemberPointerType *MPT) const = 0;
+
+  /// Returns the default calling convention for C++ methods.
+  virtual CallingConv getDefaultMethodCallConv() const = 0;
+
+  // Returns whether the given class is nearly empty, with just virtual pointers
+  // and no data except possibly virtual bases.
+  virtual bool isNearlyEmpty(const CXXRecordDecl *RD) const = 0;
+};
+
+/// Creates an instance of a C++ ABI class.
+CXXABI *CreateARMCXXABI(ASTContext &Ctx);
+CXXABI *CreateItaniumCXXABI(ASTContext &Ctx);
+CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx);
+}
+
+#endif