1 /*
   2  * Copyright (c) 2009, 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 /**
  26  * @test
  27  * @bug 6826736
  28  * @summary CMS: core dump with -XX:+UseCompressedOops
  29  *
  30  * @run main/othervm/timeout=600 -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 }