/*

 * Copyright (c) 2016, 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 8134918

 * @modules java.base/jdk.internal.misc

 */

import jdk.internal.misc.Unsafe;

public class UnsafeAccess {

    private static final Unsafe U = Unsafe.getUnsafe();

    static Class cls = Object.class;

    static long off = U.ARRAY_OBJECT_BASE_OFFSET;

    static Object testUnsafeAccess(Object o, boolean isObjArray) {

        if (o != null && cls.isInstance(o)) { // speculates "o" type to int[]

            return helperUnsafeAccess(o, isObjArray);

        }

        return null;

    }

    static Object helperUnsafeAccess(Object o, boolean isObjArray) {

        if (isObjArray) {

            U.putObject(o, off, new Object());

        }

        return o;

    }

    static Object testUnsafeLoadStore(Object o, boolean isObjArray) {

        if (o != null && cls.isInstance(o)) { // speculates "o" type to int[]

            return helperUnsafeLoadStore(o, isObjArray);

        }

        return null;

    }

    static Object helperUnsafeLoadStore(Object o, boolean isObjArray) {

        if (isObjArray) {

            Object o1 = U.getObject(o, off);

            U.compareAndSwapObject(o, off, o1, new Object());

        }

        return o;

    }

    public static void main(String[] args) {

        Object[] objArray = new Object[10];

        int[]    intArray = new    int[10];

        for (int i = 0; i < 20_000; i++) {

            helperUnsafeAccess(objArray, true);

        }

        for (int i = 0; i < 20_000; i++) {

            testUnsafeAccess(intArray, false);

        }

        for (int i = 0; i < 20_000; i++) {

            helperUnsafeLoadStore(objArray, true);

        }

        for (int i = 0; i < 20_000; i++) {

            testUnsafeLoadStore(intArray, false);

        }

        System.out.println("TEST PASSED");

    }

}