1 /*
2  * Copyright (c) 2009, 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 6855164
27  * @summary SIGSEGV during compilation of method involving loop over CharSequence
28  *
29  * @run main/othervm -Xbatch compiler.loopopts.Test6855164
30  */
31 
32 package compiler.loopopts;
33 
34 public class Test6855164 {
main(String[] args)35     public static void main(String[] args) throws Exception {
36         StringBuffer builder = new StringBuffer();
37 
38         for(int i = 0; i < 100; i++)
39             builder.append("I am the very model of a modern major general\n");
40 
41         for(int j = 0; j < builder.length(); j++){
42             previousSpaceIndex(builder, j);
43         }
44     }
45 
previousSpaceIndex(CharSequence sb, int seek)46     private static final int previousSpaceIndex(CharSequence sb, int seek) {
47         seek--;
48         while (seek > 0) {
49             if (sb.charAt(seek) == ' ') {
50                 while (seek > 0 && sb.charAt(seek - 1) == ' ')
51                     seek--;
52                 return seek;
53             }
54             seek--;
55         }
56         return 0;
57     }
58 }
59