1 /*

     2  * Copyright (c) 2017, Red Hat, Inc. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug 8182036

    27  * @summary Load from initializing arraycopy uses wrong memory state

    28  *

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

    30  *

    31  */

    32 

    33 import java.util.Arrays;

    34 

    35 public class TestInitializingACLoadWithBadMem {

    36     static Object test_dummy;

    37     static int test1() {

    38         int[] src = new int[10];

    39         test_dummy = src;

    40         int[] dst = new int[10];

    41         src[1] = 0x42;

    42         // arraycopy generates a load from src/store to dst which must

    43         // be after the store to src above.

    44         System.arraycopy(src, 1, dst, 1, 9);

    45         return dst[1];

    46     }

    47 

    48     static public void main(String[] args) {

    49         int[] src = new int[10];

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

    51             int res = test1();

    52             if (res != 0x42) {

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

    54             }

    55         }

    56     }

    57 }