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
|
/*
* Copyright (c) 2013, 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 8027751
* @summary C1 crashes generating G1 post-barrier in Unsafe.getAndSetObject() intrinsic because of the new value spill
* @run main/othervm -XX:+UseG1GC C1ObjectSpillInLogicOp
*
* G1 barriers use logical operators (xor) on T_OBJECT mixed with T_LONG or T_INT.
* The current implementation of logical operations on x86 in C1 doesn't allow for long operands to be on stack.
* There is a special code in the register allocator that forces long arguments in registers on x86. However T_OBJECT
* can be spilled just fine, and in that case the xor emission will fail.
*/
import java.util.concurrent.atomic.*;
public class C1ObjectSpillInLogicOp {
public static void main(String[] args) {
AtomicReferenceArray<Integer> x = new AtomicReferenceArray(128);
Integer y = new Integer(0);
for (int i = 0; i < 50000; i++) {
x.getAndSet(i % x.length(), y);
}
}
}
|
