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_2
31  *
32  * @author Skip Balk
33  */
34 
35 package compiler.c2;
36 
37 public class Test7179138_2 {
main(String[] args)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 = s + s;
51                 len = len + len;
52 
53                 s = s + s;
54                 len = len + len;
55 
56                 s = s + s;
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(0);
65                 }
66             }
67         }
68     }
69 }
70 
71