--- old/src/share/vm/classfile/javaClasses.hpp	2014-10-31 13:39:05.000000000 -0400
+++ new/src/share/vm/classfile/javaClasses.hpp	2014-10-31 13:39:05.000000000 -0400
@@ -243,6 +243,7 @@
   static int _component_mirror_offset;
 
   static bool offsets_computed;
+  static int _classData_offset;
   static int classRedefinedCount_offset;
 
   static GrowableArray<Klass*>* _fixup_mirror_list;
@@ -285,6 +286,9 @@
   // compiler support for class operations
   static int klass_offset_in_bytes()                { return _klass_offset; }
   static int array_klass_offset_in_bytes()          { return _array_klass_offset; }
+
+  static oop classData(oop obj);
+
   // Support for classRedefinedCount field
   static int classRedefinedCount(oop the_class_mirror);
   static void set_classRedefinedCount(oop the_class_mirror, int value);
@@ -312,7 +316,29 @@
   // Debugging
   friend class JavaClasses;
   friend class InstanceKlass;   // verification code accesses offsets
-  friend class ClassFileParser; // access to number_of_fake_fields
+  friend class ClassFileParser; // access to number_of_fake_fields_sequenceNumber_offset
+};
+
+/**
+ * java.lang.Class$ClassData
+ */
+class java_lang_Class_ClassData : AllStatic {
+  friend class JavaClasses;
+
+ private:
+  static int _elementData_offset;
+  static int _size_offset;
+  static int _sequenceNumber_offset;
+
+  static void compute_offsets();
+
+ public:
+  static bool is_instance(oop obj);
+  static oop memberNameTable(oop obj);
+  static objArrayOop elementData(oop obj);
+  static int size(oop obj);
+  static void incSequenceNumber(oop obj);
+
 };
 
 // Interface to java.lang.Thread objects