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 8173147

    27  * @summary Loads generated at uncommon trap from eliminated arraycopy have incorrect memory state

    28  * @run main/othervm -XX:CompileOnly=TestArrayCopyUNCBadMem::test -Xcomp TestArrayCopyUNCBadMem

    29  *

    30  */

    31 

    32 

    33 public class TestArrayCopyUNCBadMem {

    34 

    35     volatile static int field;

    36 

    37     static class unloaded {

    38         static int dummy;

    39     }

    40 

    41     static int test(int[] input) {

    42         int[] alloc = new int[10];

    43         System.arraycopy(input, 0, alloc, 0, 10);

    44 

    45         // membars to have anti-dependence edges and make scheduling

    46         // fail

    47         field = 0x42;

    48 

    49         // uncommon trap

    50         unloaded.dummy = 0x42;

    51 

    52         return alloc[0] + alloc[1];

    53     }

    54 

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

    56         int[] array = new int[10];

    57         System.arraycopy(array, 0, array, 0, 0); // load System class

    58         test(array);

    59     }

    60 }