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