1 /*
   2  * Copyright (c) 2011, 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 6935022
  28  * @summary Server VM incorrectly breaks out of while loop
  29  *
  30  * @run main compiler.c2.Test6935022
  31  */
  32 
  33 package compiler.c2;
  34 
  35 public class Test6935022 {
  36     public static final void main(String[] args) throws Exception {
  37         Test6935022 test = new Test6935022();
  38 
  39         int cnt = 0;
  40 
  41         while (cnt < 10000) {
  42             try {
  43                 ++cnt;
  44                 if ((cnt&1023) == 0)
  45                   System.out.println("Thread="+Thread.currentThread().getName() + " iteration: " + cnt);
  46                 test.loop(2147483647, (cnt&1023));
  47             }
  48 
  49             catch (Exception e) {
  50                 System.out.println("Caught on iteration " + cnt);
  51                 e.printStackTrace();
  52                 System.exit(97);
  53             }
  54         }
  55     }
  56 
  57     private void loop(int endingRow, int mask) throws Exception {
  58         int rows = 1;
  59         boolean next = true;
  60 
  61         while(rows <= endingRow && next) {
  62             rows++;
  63             if (rows == mask)
  64               System.out.println("Rows="+rows+", end="+endingRow+", next="+next);
  65             next = next(rows);
  66         }
  67 
  68         if (next)
  69             throw new Exception("Ended on rows(no rs): " + rows);
  70     }
  71 
  72     private boolean next(int rows) {
  73         return rows < 12;
  74     }
  75 }
  76