/*

 * Copyright (c) 2013, 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.

 */

/**

 * @test

 * @bug 8023472

 * @summary C2 optimization breaks with G1

 *

 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation

 *      -Dcount=100000 compiler.gcbarriers.G1CrashTest

 *

 * @author pbiswal@palantir.com

 */

package compiler.gcbarriers;

public class G1CrashTest {

    static Object[] set = new Object[11];

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

        for (int j = 0; j < Integer.getInteger("count"); j++) {

            Object key = new Object();

            insertKey(key);

            if (j > set.length / 2) {

                Object[] oldKeys = set;

                set = new Object[2 * set.length - 1];

                for (Object o : oldKeys) {

                    if (o != null)

                        insertKey(o);

                }

            }

        }

    }

    static void insertKey(Object key) {

        int hash = key.hashCode() & 0x7fffffff;

        int index = hash % set.length;

        Object cur = set[index];

        if (cur == null)

            set[index] = key;

        else

            insertKeyRehash(key, index, hash, cur);

    }

    static void insertKeyRehash(Object key, int index, int hash, Object cur) {

        int loopIndex = index;

        int firstRemoved = -1;

        do {

            if (cur == "dead")

                firstRemoved = 1;

            index--;

            if (index < 0)

                index += set.length;

            cur = set[index];

            if (cur == null) {

                if (firstRemoved != -1)

                    set[firstRemoved] = "dead";

                else

                    set[index] = key;

                return;

            }

        } while (index != loopIndex);

        if (firstRemoved != -1)

            set[firstRemoved] = null;

    }

}