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comparison test/compiler/unsafe/GetUnsafeObjectG1PreBarrier.java @ 12000:8d77d02828d9

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8016474: Crash in sun.reflect.UnsafeObjectFieldAccessorImpl.get Summary: C1's GetUnsafeObject G1 pre-barrier uses the wrong type to read the klass pointer. Reviewed-by: iveresov, kvn
author twisti
date Mon, 29 Jul 2013 16:32:38 -0700
parents
children 71526a36ebb4
comparison
equal deleted inserted replaced
11999:79a5283f4595 12000:8d77d02828d9
1 /*
2 * Copyright (c) 2013, 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 8016474
27 * @summary The bug only happens with C1 and G1 using a different ObjectAlignmentInBytes than KlassAlignmentInBytes (which is 8)
28 * @run main/othervm -Xbatch -XX:ObjectAlignmentInBytes=32 GetUnsafeObjectG1PreBarrier
29 */
30
31 import java.lang.reflect.Field;
32
33 import sun.misc.Unsafe;
34
35 public class GetUnsafeObjectG1PreBarrier {
36 private static final Unsafe unsafe;
37 private static final int N = 100_000;
38
39 static {
40 try {
41 Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
42 theUnsafe.setAccessible(true);
43 unsafe = (Unsafe) theUnsafe.get(null);
44 } catch (NoSuchFieldException | IllegalAccessException e) {
45 throw new IllegalStateException(e);
46 }
47 }
48
49 public Object a;
50
51 public static void main(String[] args) throws Throwable {
52 new GetUnsafeObjectG1PreBarrier();
53 }
54
55 public GetUnsafeObjectG1PreBarrier() throws Throwable {
56 doit();
57 }
58
59 private void doit() throws Throwable {
60 Field field = GetUnsafeObjectG1PreBarrier.class.getField("a");
61 long fieldOffset = unsafe.objectFieldOffset(field);
62
63 for (int i = 0; i < N; i++) {
64 readField(this, fieldOffset);
65 }
66 }
67
68 private void readField(Object o, long fieldOffset) {
69 unsafe.getObject(o, fieldOffset);
70 }
71 }