/*

 * 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

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 */

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());

    }

}