1 /*
2  * Copyright (c) 2018, Red Hat, Inc. 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 8211320
27  * @summary Aarch64: unsafe.compareAndSetByte() and unsafe.compareAndSetShort() c2 intrinsics broken with negative expected value
28  *
29  * @modules java.base/jdk.internal.misc
30  * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation  CASandCAEwithNegExpected
31  */
32 
33 import java.lang.reflect.Field;
34 import jdk.internal.misc.Unsafe;
35 
36 public class CASandCAEwithNegExpected {
37     public volatile int f_int = -1;
38     public volatile long f_long = -1;
39     public volatile byte f_byte = -1;
40     public volatile short f_short = -1;
41 
42     public static Unsafe unsafe = Unsafe.getUnsafe();
43     public static Field f_int_field;
44     public static Field f_long_field;
45     public static Field f_byte_field;
46     public static Field f_short_field;
47     public static long f_int_off;
48     public static long f_long_off;
49     public static long f_byte_off;
50     public static long f_short_off;
51 
52     static {
53         try {
54             f_int_field = CASandCAEwithNegExpected.class.getField("f_int");
55             f_long_field = CASandCAEwithNegExpected.class.getField("f_long");
56             f_byte_field = CASandCAEwithNegExpected.class.getField("f_byte");
57             f_short_field = CASandCAEwithNegExpected.class.getField("f_short");
58             f_int_off = unsafe.objectFieldOffset(f_int_field);
59             f_long_off = unsafe.objectFieldOffset(f_long_field);
60             f_byte_off = unsafe.objectFieldOffset(f_byte_field);
61             f_short_off = unsafe.objectFieldOffset(f_short_field);
62         } catch (Exception e) {
63             System.out.println("reflection failed " + e);
64             e.printStackTrace();
65         }
66     }
67 
main(String[] args)68     static public void main(String[] args) {
69         CASandCAEwithNegExpected t = new CASandCAEwithNegExpected();
70         for (int i = 0; i < 20_000; i++) {
71             t.test();
72         }
73     }
74 
75     // check proper handling of sign extension of expected value in comparison
test()76     void test() {
77         f_int = -1;
78         f_long = -1;
79         f_byte = -1;
80         f_short = -1;
81 
82         unsafe.compareAndSetInt(this, f_int_off, -1, 42);
83         if (f_int != 42) {
84             throw new RuntimeException("CAS failed");
85         }
86         unsafe.compareAndSetLong(this, f_long_off, -1, 42);
87         if (f_long != 42) {
88             throw new RuntimeException("CAS failed");
89         }
90         unsafe.compareAndSetByte(this, f_byte_off, (byte)-1, (byte)42);
91         if (f_byte != 42) {
92             throw new RuntimeException("CAS failed");
93         }
94         unsafe.compareAndSetShort(this, f_short_off, (short)-1, (short)42);
95         if (f_short != 42) {
96             throw new RuntimeException("CAS failed");
97         }
98 
99         f_int = -1;
100         f_long = -1;
101         f_byte = -1;
102         f_short = -1;
103 
104         unsafe.compareAndExchangeInt(this, f_int_off, -1, 42);
105         if (f_int != 42) {
106             throw new RuntimeException("CAE failed");
107         }
108         unsafe.compareAndExchangeLong(this, f_long_off, -1, 42);
109         if (f_long != 42) {
110             throw new RuntimeException("CAE failed");
111         }
112         unsafe.compareAndExchangeByte(this, f_byte_off, (byte)-1, (byte)42);
113         if (f_byte != 42) {
114             throw new RuntimeException("CAE failed");
115         }
116         unsafe.compareAndExchangeShort(this, f_short_off, (short)-1, (short)42);
117         if (f_short != 42) {
118             throw new RuntimeException("CAE failed");
119         }
120 
121         f_int = -1;
122         f_long = -1;
123         f_byte = -1;
124         f_short = -1;
125 
126         if (unsafe.weakCompareAndSetInt(this, f_int_off, -1, 42) && f_int != 42) {
127             throw new RuntimeException("CAS failed");
128         }
129 
130         if (unsafe.weakCompareAndSetLong(this, f_long_off, -1, 42) && f_long != 42) {
131             throw new RuntimeException("CAS failed");
132         }
133 
134         if (unsafe.weakCompareAndSetByte(this, f_byte_off, (byte)-1, (byte)42) && f_byte != 42) {
135             throw new RuntimeException("CAS failed");
136         }
137 
138         if (unsafe.weakCompareAndSetShort(this, f_short_off, (short)-1, (short)42) && f_short != 42) {
139             throw new RuntimeException("CAS failed");
140         }
141     }
142 
143 }
144