/*

 * Copyright (c) 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 TestPinnedGarbage

 * @summary Test that garbage in the pinned region does not crash VM

 * @key gc

 * @requires vm.gc.Shenandoah

 *

 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify -XX:ShenandoahGCHeuristics=passive    -XX:+ShenandoahDegeneratedGC TestPinnedGarbage

 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify -XX:ShenandoahGCHeuristics=passive    -XX:-ShenandoahDegeneratedGC TestPinnedGarbage

 *

 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m                       -XX:ShenandoahGCHeuristics=aggressive TestPinnedGarbage

 *

 * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx512m -XX:+ShenandoahVerify                                       TestPinnedGarbage

 */

import java.util.Arrays;

import java.util.concurrent.*;

public class TestPinnedGarbage {

    static {

        System.loadLibrary("TestPinnedGarbage");

    }

    private static final int NUM_RUNS      = 1_000;

    private static final int OBJS_COUNT    = 1_000;

    private static final int GARBAGE_COUNT = 1_000_000;

    private static native void pin(int[] a);

    private static native void unpin(int[] a);

    public static void main(String[] args) {

        for (int i = 0; i < NUM_RUNS; i++) {

            test();

        }

    }

    private static void test() {

        Object[] objs = new Object[OBJS_COUNT];

        for (int i = 0; i < OBJS_COUNT; i++) {

            objs[i] = new MyClass();

        }

        int[] cog = new int[10];

        int cogIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);

        objs[cogIdx] = cog;

        pin(cog);

        for (int i = 0; i < GARBAGE_COUNT; i++) {

            int rIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);

            if (rIdx != cogIdx) {

                objs[rIdx] = new MyClass();

            }

        }

        unpin(cog);

    }

    public static class MyClass {

        public Object ref = new Object();

    }

}