test/compiler/6910618/Test.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/**
 * @test
 * @bug 6910605
 * @summary C2: NullPointerException/ClassCaseException is thrown when C2 with DeoptimizeALot is used
 *
 * @run main/othervm -Xmx64m -XX:+IgnoreUnrecognizedVMOptions -XX:+DeoptimizeALot -XX:+DoEscapeAnalysis -Xbatch -XX:InlineSmallCode=2000 Test
 *
 */

/*
 * Added InlineSmallCode=2000 to guaranty inlining of StringBuilder::append() to allow scalar replace StringBuilder object.
 *
 * original test: gc/gctests/StringGC
 */

public class Test {
        private final String toAdd = "0123456789abcdef";
        private int maxLength;
        private static final int numberOfThreads = 8;

        private class StringAdder extends Thread {
                private String s;

                public void test() {
                        s = s + toAdd;
                }
                public void run() {
                        do {
                                test();
                        } while (s.length() < maxLength);
                 }
        }

        public void test() throws InterruptedException {
                maxLength = toAdd.length() * 15000/ numberOfThreads;
                StringAdder[] sa = new StringAdder[numberOfThreads];
                for (int i = 0; i < numberOfThreads; i++) {
                        sa[i] = new StringAdder();
                        sa[i].start();
                }
                for (int i = 0; i < numberOfThreads; i++) {
                        sa[i].join();
                }
        }

        public static void main(String[] args) throws InterruptedException {
                Test t = new Test();
                t.test();
        }
}