1 /*
   2  * Copyright (c) 2010, 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 6910605
  28  * @summary C2: NullPointerException/ClassCaseException is thrown when C2 with DeoptimizeALot is used
  29  *
  30  * @run main/othervm -Xmx64m -XX:+IgnoreUnrecognizedVMOptions -XX:+DeoptimizeALot
  31  *      -XX:+DoEscapeAnalysis -Xbatch -XX:InlineSmallCode=2000
  32  *      compiler.c2.Test6910605_2
  33  */
  34 
  35 package compiler.c2;
  36 
  37 /*
  38  * Added InlineSmallCode=2000 to guaranty inlining of StringBuilder::append() to allow scalar replace StringBuilder object.
  39  *
  40  * original test: gc/gctests/StringGC
  41  */
  42 
  43 public class Test6910605_2 {
  44     private final String toAdd = "0123456789abcdef";
  45     private int maxLength;
  46     private static final int numberOfThreads = 8;
  47 
  48     private class StringAdder extends Thread {
  49         private String s;
  50 
  51         public void test() {
  52             s = s + toAdd;
  53         }
  54 
  55         public void run() {
  56             do {
  57                 test();
  58             } while (s.length() < maxLength);
  59         }
  60     }
  61 
  62     public void test() throws InterruptedException {
  63         maxLength = toAdd.length() * 15000 / numberOfThreads;
  64         StringAdder[] sa = new StringAdder[numberOfThreads];
  65         for (int i = 0; i < numberOfThreads; i++) {
  66             sa[i] = new StringAdder();
  67             sa[i].start();
  68         }
  69         for (int i = 0; i < numberOfThreads; i++) {
  70             sa[i].join();
  71         }
  72     }
  73 
  74     public static void main(String[] args) throws InterruptedException {
  75         Test6910605_2 t = new Test6910605_2();
  76         t.test();
  77     }
  78 }