1 /*
2 * Copyright (c) 2015, 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 8143628
27 * @summary Test unsafe access for Object
28 * @modules jdk.unsupported/sun.misc
29 * @run testng/othervm -Diters=100 -Xint SunMiscUnsafeAccessTestObject
30 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 SunMiscUnsafeAccessTestObject
31 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation SunMiscUnsafeAccessTestObject
32 * @run testng/othervm -Diters=20000 SunMiscUnsafeAccessTestObject
33 */
34
35 import org.testng.annotations.Test;
36
37 import java.lang.reflect.Field;
38
39 import static org.testng.Assert.*;
40
41 public class SunMiscUnsafeAccessTestObject {
42 static final int ITERS = Integer.getInteger("iters", 1);
43 static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
44
45 static final sun.misc.Unsafe UNSAFE;
46
47 static final long V_OFFSET;
48
49 static final Object STATIC_V_BASE;
50
51 static final long STATIC_V_OFFSET;
52
53 static int ARRAY_OFFSET;
54
55 static int ARRAY_SHIFT;
56
57 static {
58 try {
59 Field f = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
60 f.setAccessible(true);
61 UNSAFE = (sun.misc.Unsafe) f.get(null);
62 } catch (Exception e) {
63 throw new RuntimeException("Unable to get Unsafe instance.", e);
64 }
65
66 try {
67 Field staticVField = SunMiscUnsafeAccessTestObject.class.getDeclaredField("static_v");
68 STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField);
69 STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField);
70 } catch (Exception e) {
71 throw new RuntimeException(e);
72 }
73
74 try {
75 Field vField = SunMiscUnsafeAccessTestObject.class.getDeclaredField("v");
76 V_OFFSET = UNSAFE.objectFieldOffset(vField);
77 } catch (Exception e) {
78 throw new RuntimeException(e);
79 }
80
81 ARRAY_OFFSET = UNSAFE.arrayBaseOffset(Object[].class);
82 int ascale = UNSAFE.arrayIndexScale(Object[].class);
83 ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
84 }
85
86 static Object static_v;
87
88 Object v;
89
90 @Test
91 public void testFieldInstance() {
92 SunMiscUnsafeAccessTestObject t = new SunMiscUnsafeAccessTestObject();
93 for (int c = 0; c < ITERS; c++) {
94 testAccess(t, V_OFFSET);
95 }
96 }
97
98 @Test
99 public void testFieldStatic() {
100 for (int c = 0; c < ITERS; c++) {
101 testAccess(STATIC_V_BASE, STATIC_V_OFFSET);
102 }
103 }
104
105 @Test
106 public void testArray() {
107 Object[] array = new Object[10];
108 for (int c = 0; c < ITERS; c++) {
109 for (int i = 0; i < array.length; i++) {
110 testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);
111 }
112 }
113 }
114
115
116 static void testAccess(Object base, long offset) {
117 // Plain
118 {
119 UNSAFE.putObject(base, offset, "foo");
120 Object x = UNSAFE.getObject(base, offset);
121 assertEquals(x, "foo", "set Object value");
122 }
123
124 // Volatile
125 {
126 UNSAFE.putObjectVolatile(base, offset, "bar");
127 Object x = UNSAFE.getObjectVolatile(base, offset);
128 assertEquals(x, "bar", "putVolatile Object value");
129 }
130
131 // Lazy
132 {
133 UNSAFE.putOrderedObject(base, offset, "foo");
134 Object x = UNSAFE.getObjectVolatile(base, offset);
135 assertEquals(x, "foo", "putRelease Object value");
136 }
137
138
139
140 UNSAFE.putObject(base, offset, "foo");
141
142 // Compare
143 {
144 boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "bar");
145 assertEquals(r, true, "success compareAndSwap Object");
146 Object x = UNSAFE.getObject(base, offset);
147 assertEquals(x, "bar", "success compareAndSwap Object value");
148 }
149
150 {
151 boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "baz");
152 assertEquals(r, false, "failing compareAndSwap Object");
153 Object x = UNSAFE.getObject(base, offset);
154 assertEquals(x, "bar", "failing compareAndSwap Object value");
155 }
156
157 UNSAFE.putObject(base, offset, "bar");
158
159 // Compare set and get
160 {
161 Object o = UNSAFE.getAndSetObject(base, offset, "foo");
162 assertEquals(o, "bar", "getAndSet Object");
163 Object x = UNSAFE.getObject(base, offset);
164 assertEquals(x, "foo", "getAndSet Object value");
165 }
166
167 }
168
169 }
170