1/*
2 * Copyright (c) 2015, 2017, 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 8143930
27 * @summary C1 LinearScan asserts when compiling two back-to-back CompareAndSwapLongs
28 * @modules java.base/jdk.internal.misc:+open
29 *
30 * @run testng/othervm -Diters=200000 -XX:TieredStopAtLevel=1
31 *      compiler.intrinsics.unsafe.UnsafeTwoCASLong
32 */
33
34package compiler.intrinsics.unsafe;
35
36import org.testng.annotations.Test;
37
38import java.lang.reflect.Field;
39
40import static org.testng.Assert.*;
41
42public class UnsafeTwoCASLong {
43    static final int ITERS = Integer.getInteger("iters", 1);
44    static final jdk.internal.misc.Unsafe UNSAFE;
45    static final long V_OFFSET;
46
47    static {
48        try {
49            Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
50            f.setAccessible(true);
51            UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
52        } catch (Exception e) {
53            throw new RuntimeException("Unable to get Unsafe instance.", e);
54        }
55
56        try {
57            Field vField = UnsafeTwoCASLong.class.getDeclaredField("v");
58            V_OFFSET = UNSAFE.objectFieldOffset(vField);
59        } catch (Exception e) {
60            throw new RuntimeException(e);
61        }
62    }
63
64    long v;
65
66    @Test
67    public void testFieldInstance() {
68        UnsafeTwoCASLong t = new UnsafeTwoCASLong();
69        for (int c = 0; c < ITERS; c++) {
70            testAccess(t, V_OFFSET);
71        }
72    }
73
74    static void testAccess(Object base, long offset) {
75        UNSAFE.compareAndSetLong(base, offset, 1L, 2L);
76        UNSAFE.compareAndSetLong(base, offset, 2L, 1L);
77    }
78
79}
80