Mercurial > hg > truffle
comparison test/compiler/6968348/Test6968348.java @ 1827:52e82a6bedaf
6968348: Byteswapped memory access can point to wrong location after JIT
Reviewed-by: twisti, kvn, iveresov
author | never |
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date | Mon, 04 Oct 2010 17:09:18 -0700 |
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1826:56601ef83436 | 1827:52e82a6bedaf |
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1 /* | |
2 * Copyright (c) 2010, 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 6968348 | |
28 * @summary Byteswapped memory access can point to wrong location after JIT | |
29 * | |
30 * @run main Test6968348 | |
31 */ | |
32 | |
33 import sun.misc.Unsafe; | |
34 import java.lang.reflect.*; | |
35 | |
36 public class Test6968348 { | |
37 static Unsafe unsafe; | |
38 static final long[] buffer = new long[4096]; | |
39 static int array_long_base_offset; | |
40 | |
41 public static void main(String[] args) throws Exception { | |
42 Class c = Test6968348.class.getClassLoader().loadClass("sun.misc.Unsafe"); | |
43 Field f = c.getDeclaredField("theUnsafe"); | |
44 f.setAccessible(true); | |
45 unsafe = (Unsafe)f.get(c); | |
46 array_long_base_offset = unsafe.arrayBaseOffset(long[].class); | |
47 | |
48 for (int n = 0; n < 100000; n++) { | |
49 test(); | |
50 } | |
51 } | |
52 | |
53 public static void test() { | |
54 for (long i = array_long_base_offset; i < 4096; i += 8) { | |
55 unsafe.putLong(buffer, i, Long.reverseBytes(i)); | |
56 } | |
57 } | |
58 } |