--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/memory/referenceType.hpp	Wed Jun 19 11:02:10 2013 +0100
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2012, 2013, 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_MEMORY_REFRERENCETYPE_HPP
+#define SHARE_VM_MEMORY_REFRERENCETYPE_HPP
+
+#include "utilities/debug.hpp"
+
+// ReferenceType is used to distinguish between java/lang/ref/Reference subclasses
+
+enum ReferenceType {
+  REF_NONE,      // Regular class
+  REF_OTHER,     // Subclass of java/lang/ref/Reference, but not subclass of one of the classes below
+  REF_SOFT,      // Subclass of java/lang/ref/SoftReference
+  REF_WEAK,      // Subclass of java/lang/ref/WeakReference
+  REF_FINAL,     // Subclass of java/lang/ref/FinalReference
+  REF_PHANTOM    // Subclass of java/lang/ref/PhantomReference
+};
+
+#endif // SHARE_VM_MEMORY_REFRERENCETYPE_HPP