1 /*

     2  * Copyright (c) 2015, Oracle and/or its affiliates. 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 8074676

    27  * @summary after guards in Arrays.copyOf() intrinsic, control may become top

    28  * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestArrayCopyOfStopped

    29  *

    30  */

    31 

    32 import java.util.Arrays;

    33 

    34 public class TestArrayCopyOfStopped {

    35     static class A {

    36     }

    37 

    38     static class B {

    39     }

    40 

    41     static final B[] array_of_bs = new B[10];

    42     static final A[] array_of_as = new A[10];

    43 

    44     static Object[] m1_helper(Object[] array, boolean flag) {

    45         if (flag) {

    46             return Arrays.copyOf(array, 10, A[].class);

    47         }

    48         return null;

    49     }

    50 

    51     static Object[] m1(boolean flag) {

    52         return m1_helper(array_of_bs, flag);

    53     }

    54 

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

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

    57             m1_helper(array_of_as, (i%2) == 0);

    58         }

    59 

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

    61             m1(false);

    62         }

    63     }

    64 }