/*

 * Copyright (c) 2016, 2018, Red Hat, Inc. All rights reserved.

 *

 * 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.

 *

 */

/*

 * @test TestLargeObjectAlignment

 * @summary Shenandoah crashes with -XX:ObjectAlignmentInBytes=16

 * @key gc

 * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64")

 *

 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -Xint                   TestLargeObjectAlignment

 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:-TieredCompilation  TestLargeObjectAlignment

 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=1 TestLargeObjectAlignment

 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:ObjectAlignmentInBytes=16 -XX:TieredStopAtLevel=4 TestLargeObjectAlignment

 */

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.ThreadLocalRandom;

public class TestLargeObjectAlignment {

    static final int SLABS_COUNT = Integer.getInteger("slabs", 10000);

    static final int NODE_COUNT = Integer.getInteger("nodes", 10000);

    static final long TIME_NS = 1000L * 1000L * Integer.getInteger("timeMs", 5000);

    static Object[] objects;

    public static void main(String[] args) throws Exception {

        objects = new Object[SLABS_COUNT];

        long start = System.nanoTime();

        while (System.nanoTime() - start < TIME_NS) {

            objects[ThreadLocalRandom.current().nextInt(SLABS_COUNT)] = createSome();

        }

    }

    public static Object createSome() {

        List<Integer> result = new ArrayList<Integer>();

        for (int c = 0; c < NODE_COUNT; c++) {

            result.add(new Integer(c));

        }

        return result;

    }

}