1 /*
   2  * Copyright 2010 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 6910605
  28  * @summary C2: NullPointerException/ClassCaseException is thrown when C2 with DeoptimizeALot is used
  29  *
  30  * @run main/othervm -Xmx64m -XX:+IgnoreUnrecognizedVMOptions -XX:+DeoptimizeALot -XX:+DoEscapeAnalysis -Xbatch -XX:InlineSmallCode=2000 Test
  31  *
  32  */
  33 
  34 /*
  35  * Added InlineSmallCode=2000 to guaranty inlining of StringBuilder::append() to allow scalar replace StringBuilder object.
  36  *
  37  * original test: gc/gctests/StringGC
  38  */
  39 
  40 public class Test {
  41         private final String toAdd = "0123456789abcdef";
  42         private int maxLength;
  43         private static final int numberOfThreads = 8;
  44 
  45         private class StringAdder extends Thread {
  46                 private String s;
  47 
  48                 public void test() {
  49                         s = s + toAdd;
  50                 }
  51                 public void run() {
  52                         do {
  53                                 test();
  54                         } while (s.length() < maxLength);
  55                  }
  56         }
  57 
  58         public void test() throws InterruptedException {
  59                 maxLength = toAdd.length() * 15000/ numberOfThreads;
  60                 StringAdder[] sa = new StringAdder[numberOfThreads];
  61                 for (int i = 0; i < numberOfThreads; i++) {
  62                         sa[i] = new StringAdder();
  63                         sa[i].start();
  64                 }
  65                 for (int i = 0; i < numberOfThreads; i++) {
  66                         sa[i].join();
  67                 }
  68         }
  69 
  70         public static void main(String[] args) throws InterruptedException {
  71                 Test t = new Test();
  72                 t.test();
  73         }
  74 }