--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/MetaspaceHandleObject.java	Wed May 01 12:31:29 2019 -0700
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2015, 2019, 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.
+ */
+package jdk.vm.ci.hotspot;
+
+/**
+ * A tag interface indicating that this type is a handledized wrapper around a HotSpot metaspace
+ * object that requires GC interaction to keep alive.
+ *
+ * It would preferable if this were the base class containing the pointer but that would require
+ * mixins since most of the wrapper types have complex supertype hierarchies.
+ */
+interface MetaspaceHandleObject extends MetaspaceObject {
+
+    long getMetadataHandle();
+
+    @Override
+    default long getMetaspacePointer() {
+        return UnsafeAccess.UNSAFE.getLong(getMetadataHandle());
+    }
+}