1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8357105
* @summary Test stacked string concatenations where the toString result
* of the first StringBuilder chain is wired into an uncommon trap
* located in the second one.
* @run main/othervm compiler.stringopts.TestStackedConcatsAppendUncommonTrap
* @run main/othervm -XX:-TieredCompilation -Xbatch
* -XX:CompileOnly=compiler.stringopts.TestStackedConcatsAppendUncommonTrap::*
* compiler.stringopts.TestStackedConcatsAppendUncommonTrap
*/
package compiler.stringopts;
public class TestStackedConcatsAppendUncommonTrap {
public static void main (String... args) {
for (int i = 0; i < 10000; i++) {
String s = f(" ");
if (!s.equals(" ")) {
throw new RuntimeException("wrong result.");
}
}
}
static String f(String c) {
String s = " ";
s = new StringBuilder().append(s).append(s).toString();
s = new StringBuilder().append(s).append(s == c ? s : " ").toString();
return s;
}
}
|
