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 }