| 1 | /*
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| 2 | * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
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| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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| 4 | *
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| 5 | * This code is free software; you can redistribute it and/or modify it
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| 6 | * under the terms of the GNU General Public License version 2 only, as
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| 7 | * published by the Free Software Foundation.
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| 8 | *
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| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT
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| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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| 12 | * version 2 for more details (a copy is included in the LICENSE file that
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| 13 | * accompanied this code).
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License version
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| 16 | * 2 along with this work; if not, write to the Free Software Foundation,
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| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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| 18 | *
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| 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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| 20 | * or visit www.oracle.com if you need additional information or have any
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| 21 | * questions.
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| 22 | *
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| 23 | */
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| 24 |
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| 25 | /**
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| 26 | * @test
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| 27 | * @bug 6910605
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| 28 | * @summary C2: NullPointerException/ClassCaseException is thrown when C2 with DeoptimizeALot is used
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| 29 | *
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| 30 | * @run main/othervm -Xmx64m -XX:+IgnoreUnrecognizedVMOptions -XX:+DeoptimizeALot -XX:+DoEscapeAnalysis -Xbatch -XX:InlineSmallCode=2000 Test
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| 31 | *
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| 32 | */
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| 33 |
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| 34 | /*
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| 35 | * Added InlineSmallCode=2000 to guaranty inlining of StringBuilder::append() to allow scalar replace StringBuilder object.
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| 36 | *
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| 37 | * original test: gc/gctests/StringGC
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| 38 | */
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| 39 |
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| 40 | public class Test {
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| 41 | private final String toAdd = "0123456789abcdef";
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| 42 | private int maxLength;
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| 43 | private static final int numberOfThreads = 8;
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| 44 |
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| 45 | private class StringAdder extends Thread {
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| 46 | private String s;
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| 47 |
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| 48 | public void test() {
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| 49 | s = s + toAdd;
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| 50 | }
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| 51 | public void run() {
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| 52 | do {
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| 53 | test();
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| 54 | } while (s.length() < maxLength);
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| 55 | }
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| 56 | }
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| 57 |
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| 58 | public void test() throws InterruptedException {
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| 59 | maxLength = toAdd.length() * 15000/ numberOfThreads;
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| 60 | StringAdder[] sa = new StringAdder[numberOfThreads];
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| 61 | for (int i = 0; i < numberOfThreads; i++) {
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| 62 | sa[i] = new StringAdder();
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| 63 | sa[i].start();
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| 64 | }
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| 65 | for (int i = 0; i < numberOfThreads; i++) {
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| 66 | sa[i].join();
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| 67 | }
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| 68 | }
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| 69 |
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| 70 | public static void main(String[] args) throws InterruptedException {
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| 71 | Test t = new Test();
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| 72 | t.test();
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| 73 | }
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| 74 | }
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