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