test/hotspot/jtreg/vmTestbase/nsk/share/gc/gp/misc/TwoFieldsObjectProducer.java

/*
 * Copyright (c) 2007, 2018, 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 nsk.share.gc.gp.misc;

import nsk.share.gc.Memory;
import nsk.share.gc.*;
import nsk.share.gc.gp.*;

/**
 * GarbageProducer that produces object with two fields which
 * reference objects producer by parent garbage producer.
 */
public class TwoFieldsObjectProducer<T> extends DerivedProducer<TwoFieldsObject<T>, T> {
        public TwoFieldsObjectProducer(GarbageProducer<T> parent) {
                super(parent);
        }

        public TwoFieldsObject<T> create(long memory) {
                long memoryT = (memory - Memory.getObjectExtraSize() - 2 * Memory.getReferenceSize()) / 2;
                return new TwoFieldsObject<T>(createParent(memoryT), createParent(memoryT));
        }

        public void validate(TwoFieldsObject<T> obj) {
                validateParent(obj.getLeft());
                validateParent(obj.getRight());
        }
}