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