1 /* 2 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.hotspot; 24 25 /** 26 * A tag interface indicating that this type is a handledized wrapper around a HotSpot metaspace 27 * object that requires GC interaction to keep alive. 28 * 29 * It would preferable if this were the base class containing the pointer but that would require 30 * mixins since most of the wrapper types have complex supertype hierarchies. 31 */ 32 interface MetaspaceHandleObject extends MetaspaceObject { 33 getMetadataHandle()34 long getMetadataHandle(); 35 36 @Override getMetaspacePointer()37 default long getMetaspacePointer() { 38 return UnsafeAccess.UNSAFE.getLong(getMetadataHandle()); 39 } 40 } 41