1 /* 2 * Copyright 2012 Skip Balk. 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 7179138 27 * @summary Incorrect result with String concatenation optimization 28 * 29 * @run main/othervm -Xbatch -XX:+IgnoreUnrecognizedVMOptions -XX:-TieredCompilation 30 * compiler.c2.Test7179138_1 31 * 32 * @author Skip Balk 33 */ 34 35 package compiler.c2; 36 37 public class Test7179138_1 { 38 public static void main(String[] args) throws Exception { 39 System.out.println("Java Version: " + System.getProperty("java.vm.version")); 40 long[] durations = new long[60]; 41 for (int i = 0; i < 100000; i++) { 42 // this empty for-loop is required to reproduce this bug 43 for (long duration : durations) { 44 // do nothing 45 } 46 { 47 String s = "test"; 48 int len = s.length(); 49 50 s = new StringBuilder(String.valueOf(s)).append(s).toString(); 51 len = len + len; 52 53 s = new StringBuilder(String.valueOf(s)).append(s).toString(); 54 len = len + len; 55 56 s = new StringBuilder(String.valueOf(s)).append(s).toString(); 57 len = len + len; 58 59 if (s.length() != len) { 60 System.out.println("Failed at iteration: " + i); 61 System.out.println("Length mismatch: " + s.length() + " <> " + len); 62 System.out.println("Expected: \"" + "test" + "test" + "test" + "test" + "test" + "test" + "test" + "test" + "\""); 63 System.out.println("Actual: \"" + s + "\""); 64 System.exit(97); 65 } 66 } 67 } 68 } 69 } 70