--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/oops/instanceMirrorKlass.hpp	Fri Mar 18 16:00:34 2011 -0700
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
+#define SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP
+
+#include "oops/instanceKlass.hpp"
+
+// An instanceMirrorKlass is a specialized instanceKlass for
+// java.lang.Class instances.  These instances are special because
+// they contain the static fields of the class in addition to the
+// normal fields of Class.  This means they are variable sized
+// instances and need special logic for computing their size and for
+// iteration of their oops.
+
+
+class instanceMirrorKlass: public instanceKlass {
+ private:
+  static int _offset_of_static_fields;
+
+ public:
+  // Type testing
+  bool oop_is_instanceMirror() const             { return true; }
+
+  // Casting from klassOop
+  static instanceMirrorKlass* cast(klassOop k) {
+    assert(k->klass_part()->oop_is_instanceMirror(), "cast to instanceMirrorKlass");
+    return (instanceMirrorKlass*) k->klass_part();
+  }
+
+  // Returns the size of the instance including the extra static fields.
+  virtual int oop_size(oop obj) const;
+
+  // Static field offset is an offset into the Heap, should be converted by
+  // based on UseCompressedOop for traversal
+  static HeapWord* start_of_static_fields(oop obj) {
+    return (HeapWord*)((intptr_t)obj + offset_of_static_fields());
+  }
+
+  static void init_offset_of_static_fields() {
+    // Cache the offset of the static fields in the Class instance
+    assert(_offset_of_static_fields == 0, "once");
+    _offset_of_static_fields = instanceMirrorKlass::cast(SystemDictionary::Class_klass())->size_helper() << LogHeapWordSize;
+  }
+
+  static int offset_of_static_fields() {
+    return _offset_of_static_fields;
+  }
+
+  int compute_static_oop_field_count(oop obj);
+
+  // Given a Klass return the size of the instance
+  int instance_size(KlassHandle k);
+
+  // allocation
+  DEFINE_ALLOCATE_PERMANENT(instanceMirrorKlass);
+  instanceOop allocate_instance(KlassHandle k, TRAPS);
+
+  // Garbage collection
+  int  oop_adjust_pointers(oop obj);
+  void oop_follow_contents(oop obj);
+
+  // Parallel Scavenge and Parallel Old
+  PARALLEL_GC_DECLS
+
+  int oop_oop_iterate(oop obj, OopClosure* blk) {
+    return oop_oop_iterate_v(obj, blk);
+  }
+  int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
+    return oop_oop_iterate_v_m(obj, blk, mr);
+  }
+
+#define InstanceMirrorKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix)           \
+  int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk);                       \
+  int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, MemRegion mr);
+
+  ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
+  ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_DECL)
+
+#ifndef SERIALGC
+#define InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
+  int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
+
+  ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
+  ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceMirrorKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
+#endif // !SERIALGC
+};
+
+#endif // SHARE_VM_OOPS_INSTANCEMIRRORKLASS_HPP