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diff --git a/include/clang/AST/CharUnits.h b/include/clang/AST/CharUnits.h
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+//===--- CharUnits.h - Character units for sizes and offsets ----*- 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 CharUnits class
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_CHARUNITS_H
+#define LLVM_CLANG_AST_CHARUNITS_H
+
+#include "llvm/System/DataTypes.h"
+
+namespace clang {
+  
+  /// CharUnits - This is an opaque type for sizes expressed in character units.
+  /// Instances of this type represent a quantity as a multiple of the size 
+  /// of the standard C type, char, on the target architecture. As an opaque
+  /// type, CharUnits protects you from accidentally combining operations on
+  /// quantities in bit units and character units. 
+  ///
+  /// It should be noted that characters and bytes are distinct concepts. Bytes
+  /// refer to addressable units of data storage on the target machine, and
+  /// characters are members of a set of elements used for the organization,
+  /// control, or representation of data. According to C99, bytes are allowed
+  /// to exceed characters in size, although currently, clang only supports
+  /// architectures where the two are the same size.
+  /// 
+  /// For portability, never assume that a target character is 8 bits wide. Use 
+  /// CharUnit values whereever you calculate sizes, offsets, or alignments
+  /// in character units.
+  class CharUnits {
+    public:
+      typedef int64_t RawType;
+
+    private:
+      RawType Quantity;
+
+      explicit CharUnits(RawType C) : Quantity(C) {}
+
+    public:
+
+      /// CharUnits - A default constructor.
+      CharUnits() : Quantity(0) {}
+
+      /// Zero - Construct a CharUnits quantity of zero.
+      static CharUnits Zero() {
+        return CharUnits(0);
+      }
+
+      /// One - Construct a CharUnits quantity of one.
+      static CharUnits One() {
+        return CharUnits(1);
+      }
+
+      /// fromRaw - Construct a CharUnits quantity from a raw integer type.
+      static CharUnits fromRaw(RawType Quantity) {
+        return CharUnits(Quantity); 
+      }
+
+      // Compound assignment.
+      CharUnits& operator+= (const CharUnits &Other) {
+        Quantity += Other.Quantity;
+        return *this;
+      }
+      CharUnits& operator-= (const CharUnits &Other) {
+        Quantity -= Other.Quantity;
+        return *this;
+      }
+       
+      // Comparison operators.
+      bool operator== (const CharUnits &Other) const {
+        return Quantity == Other.Quantity;
+      }
+      bool operator!= (const CharUnits &Other) const {
+        return Quantity != Other.Quantity;
+      }
+
+      // Relational operators.
+      bool operator<  (const CharUnits &Other) const { 
+        return Quantity <  Other.Quantity; 
+      }
+      bool operator<= (const CharUnits &Other) const { 
+        return Quantity <= Other.Quantity;
+      }
+      bool operator>  (const CharUnits &Other) const { 
+        return Quantity >  Other.Quantity; 
+      }
+      bool operator>= (const CharUnits &Other) const { 
+        return Quantity >= Other.Quantity; 
+      }
+
+      // Other predicates.
+      
+      /// isZero - Test whether the quantity equals zero.
+      bool isZero() const     { return Quantity == 0; }
+
+      /// isOne - Test whether the quantity equals one.
+      bool isOne() const      { return Quantity == 1; }
+
+      /// isPositive - Test whether the quanity is greater than zero.
+      bool isPositive() const { return Quantity  > 0; }
+
+      /// isNegative - Test whether the quantity is less than zero.
+      bool isNegative() const { return Quantity  < 0; }
+
+      // Arithmetic operators.
+      CharUnits operator* (RawType N) const {
+        return CharUnits(Quantity * N);
+      }
+      CharUnits operator/ (RawType N) const {
+        return CharUnits(Quantity / N);
+      }
+      RawType operator/ (const CharUnits &Other) const {
+        return Quantity / Other.Quantity;
+      }
+      CharUnits operator% (RawType N) const {
+        return CharUnits(Quantity % N);
+      }
+      RawType operator% (const CharUnits &Other) const {
+        return Quantity % Other.Quantity;
+      }
+      CharUnits operator+ (const CharUnits &Other) const {
+        return CharUnits(Quantity + Other.Quantity);
+      }
+      CharUnits operator- (const CharUnits &Other) const {
+        return CharUnits(Quantity - Other.Quantity);
+      }
+      
+      // Conversions.
+
+      /// getRaw - Get the raw integer representation of this quantity.
+      RawType getRaw() const { return Quantity; }
+
+
+  }; // class CharUnit
+} // namespace clang
+
+inline clang::CharUnits operator* (clang::CharUnits::RawType Scale, 
+                                   const clang::CharUnits &CU) {
+  return CU * Scale;
+}
+
+#endif // LLVM_CLANG_AST_CHARUNITS_H