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 }