1 /*

     2  * Copyright 2009 Sun Microsystems, 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 /**

    26  * @test

    27  * @bug 6826736

    28  * @summary CMS: core dump with -XX:+UseCompressedOops

    29  *

    30  * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -Xbatch -XX:+ScavengeALot -XX:+UseCompressedOops -XX:HeapBaseMinAddress=32g -XX:CompileThreshold=100 -XX:CompileOnly=Test.test -XX:-BlockLayoutRotateLoops -XX:LoopUnrollLimit=0 Test

    31  */

    32 

    33 public class Test {

    34     int[] arr;

    35     int[] arr2;

    36     int test(int r) {

    37         for (int i = 0; i < 100; i++) {

    38             for (int j = i; j < 100; j++) {

    39                int a = 0;

    40                for (long k = 0; k < 100; k++) {

    41                   a += k;

    42                }

    43                if (arr != null)

    44                    a = arr[j];

    45                r += a;

    46             }

    47         }

    48         return r;

    49     }

    50 

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

    52         int r = 0;

    53         Test t = new Test();

    54         for (int i = 0; i < 100; i++) {

    55             t.arr = new int[100];

    56             r = t.test(r);

    57         }

    58         System.out.println("Warmup 1 is done.");

    59         for (int i = 0; i < 100; i++) {

    60             t.arr = null;

    61             r = t.test(r);

    62         }

    63         System.out.println("Warmup 2 is done.");

    64         for (int i = 0; i < 100; i++) {

    65             t.arr = new int[100];

    66             r = t.test(r);

    67         }

    68         System.out.println("Warmup is done.");

    69         for (int i = 0; i < 100; i++) {

    70             t.arr = new int[1000000];

    71             t.arr = null;

    72             r = t.test(r);

    73         }

    74     }

    75 }