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diff --git a/contrib/llvm/tools/clang/lib/AST/CXXABI.h b/contrib/llvm/tools/clang/lib/AST/CXXABI.h
new file mode 100644
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--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/AST/CXXABI.h
@@ -0,0 +1,79 @@
+//===----- 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_LIB_AST_CXXABI_H
+#define LLVM_CLANG_LIB_AST_CXXABI_H
+
+#include "clang/AST/Type.h"
+
+namespace clang {
+
+class ASTContext;
+class CXXConstructorDecl;
+class DeclaratorDecl;
+class Expr;
+class MemberPointerType;
+class MangleNumberingContext;
+
+/// Implements C++ ABI-specific semantic analysis functions.
+class CXXABI {
+public:
+  virtual ~CXXABI();
+
+  /// Returns the width and alignment of a member pointer in bits.
+  virtual std::pair<uint64_t, unsigned>
+  getMemberPointerWidthAndAlign(const MemberPointerType *MPT) const = 0;
+
+  /// Returns the default calling convention for C++ methods.
+  virtual CallingConv getDefaultMethodCallConv(bool isVariadic) 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;
+
+  /// Returns a new mangling number context for this C++ ABI.
+  virtual MangleNumberingContext *createMangleNumberingContext() const = 0;
+
+  /// Adds a mapping from class to copy constructor for this C++ ABI.
+  virtual void addCopyConstructorForExceptionObject(CXXRecordDecl *,
+                                                    CXXConstructorDecl *) = 0;
+
+  /// Retrieves the mapping from class to copy constructor for this C++ ABI.
+  virtual const CXXConstructorDecl *
+  getCopyConstructorForExceptionObject(CXXRecordDecl *) = 0;
+
+  virtual void addDefaultArgExprForConstructor(const CXXConstructorDecl *CD,
+                                               unsigned ParmIdx, Expr *DAE) = 0;
+
+  virtual Expr *getDefaultArgExprForConstructor(const CXXConstructorDecl *CD,
+                                                unsigned ParmIdx) = 0;
+
+  virtual void addTypedefNameForUnnamedTagDecl(TagDecl *TD,
+                                               TypedefNameDecl *DD) = 0;
+
+  virtual TypedefNameDecl *
+  getTypedefNameForUnnamedTagDecl(const TagDecl *TD) = 0;
+
+  virtual void addDeclaratorForUnnamedTagDecl(TagDecl *TD,
+                                              DeclaratorDecl *DD) = 0;
+
+  virtual DeclaratorDecl *getDeclaratorForUnnamedTagDecl(const TagDecl *TD) = 0;
+};
+
+/// Creates an instance of a C++ ABI class.
+CXXABI *CreateItaniumCXXABI(ASTContext &Ctx);
+CXXABI *CreateMicrosoftCXXABI(ASTContext &Ctx);
+}
+
+#endif