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