/*

 * Copyright (c) 2017, Red Hat, Inc. 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 8181742

 * @summary Loads that bypass arraycopy ends up with wrong memory state

 *

 * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement -XX:+UnlockDiagnosticVMOptions -XX:+IgnoreUnrecognizedVMOptions -XX:+StressGCM -XX:+StressLCM TestLoadBypassACWithWrongMem

 *

 */

import java.util.Arrays;

public class TestLoadBypassACWithWrongMem {

    static int test1(int[] src) {

        int[] dst = new int[10];

        System.arraycopy(src, 0, dst, 0, 10);

        src[1] = 0x42;

        // dst[1] is transformed to src[1], src[1] must use the

        // correct memory state (not the store above).

        return dst[1];

    }

    static int test2(int[] src) {

        int[] dst = (int[])src.clone();

        src[1] = 0x42;

        // Same as above for clone

        return dst[1];

    }

    static Object test5_src = null;

    static int test3() {

        int[] dst = new int[10];

        System.arraycopy(test5_src, 0, dst, 0, 10);

        ((int[])test5_src)[1] = 0x42;

        System.arraycopy(test5_src, 0, dst, 0, 10);

        // dst[1] is transformed to test5_src[1]. test5_src is Object

        // but test5_src[1] must be on the slice for int[] not

        // Object+some offset.

        return dst[1];

    }

    static public void main(String[] args) {

        int[] src = new int[10];

        for (int i = 0; i < 20000; i++) {

            Arrays.fill(src, 0);

            int res = test1(src);

            if (res != 0) {

                throw new RuntimeException("bad result: " + res + " != " + 0);

            }

            Arrays.fill(src, 0);

            res = test2(src);

            if (res != 0) {

                throw new RuntimeException("bad result: " + res + " != " + 0);

            }

            Arrays.fill(src, 0);

            test5_src = src;

            res = test3();

            if (res != 0x42) {

                throw new RuntimeException("bad result: " + res + " != " + 0x42);

            }

         }

    }

}