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
  31  *      -XX:+ScavengeALot -XX:+UseCompressedOops -XX:HeapBaseMinAddress=32g
  32  *      -XX:CompileThreshold=100 -XX:-BlockLayoutRotateLoops
  33  *      -XX:LoopUnrollLimit=0 -Xmx256m -XX:ParallelGCThreads=4
  34  *      -XX:CompileCommand=compileonly,compiler.runtime.Test6826736::test
  35  *      compiler.runtime.Test6826736
  36  */
  37 
  38 package compiler.runtime;
  39 
  40 public class Test6826736 {
  41     int[] arr;
  42     int[] arr2;
  43     int test(int r) {
  44         for (int i = 0; i < 100; i++) {
  45             for (int j = i; j < 100; j++) {
  46                int a = 0;
  47                for (long k = 0; k < 100; k++) {
  48                   a += k;
  49                }
  50                if (arr != null)
  51                    a = arr[j];
  52                r += a;
  53             }
  54         }
  55         return r;
  56     }
  57 
  58     public static void main(String[] args) {
  59         int r = 0;
  60         Test6826736 t = new Test6826736();
  61         for (int i = 0; i < 100; i++) {
  62             t.arr = new int[100];
  63             r = t.test(r);
  64         }
  65         System.out.println("Warmup 1 is done.");
  66         for (int i = 0; i < 100; i++) {
  67             t.arr = null;
  68             r = t.test(r);
  69         }
  70         System.out.println("Warmup 2 is done.");
  71         for (int i = 0; i < 100; i++) {
  72             t.arr = new int[100];
  73             r = t.test(r);
  74         }
  75         System.out.println("Warmup is done.");
  76         for (int i = 0; i < 100; i++) {
  77             t.arr = new int[1000000];
  78             t.arr = null;
  79             r = t.test(r);
  80         }
  81     }
  82 }