Mercurial > hg > graal-compiler
comparison test/compiler/loopopts/TestDeadBackbranchArrayAccess.java @ 20680:5b8e0f84f00f
8054478: C2: Incorrectly compiled char[] array access crashes JVM
Summary: dead backbranch in main loop results in erroneous array access
Reviewed-by: kvn, iveresov
author | roland |
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date | Mon, 01 Dec 2014 22:27:00 +0100 |
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20678:97f4214e9a70 | 20680:5b8e0f84f00f |
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1 /* | |
2 * Copyright (c) 2014, 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 /** | |
26 * @test | |
27 * @bug 8054478 | |
28 * @summary dead backbranch in main loop results in erroneous array access | |
29 * @run main/othervm -XX:CompileOnly=TestDeadBackbranchArrayAccess -Xcomp TestDeadBackbranchArrayAccess | |
30 * | |
31 */ | |
32 | |
33 public class TestDeadBackbranchArrayAccess { | |
34 static char[] pattern0 = {0}; | |
35 static char[] pattern1 = {1}; | |
36 | |
37 static void test(char[] array) { | |
38 if (pattern1 == null) return; | |
39 | |
40 int i = 0; | |
41 int pos = 0; | |
42 char c = array[pos]; | |
43 | |
44 while (i >= 0 && (c == pattern0[i] || c == pattern1[i])) { | |
45 i--; | |
46 pos--; | |
47 if (pos != -1) { | |
48 c = array[pos]; | |
49 } | |
50 } | |
51 } | |
52 | |
53 public static void main(String[] args) { | |
54 for (int i = 0; i < 1000000; i++) { | |
55 test(new char[1]); | |
56 } | |
57 } | |
58 } |