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 *
29 * @modules jdk.unsupported/sun.misc
30 * @run testng/othervm -Diters=100 -Xint compiler.unsafe.SunMiscUnsafeAccessTestObject
31 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.SunMiscUnsafeAccessTestObject
32 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation compiler.unsafe.SunMiscUnsafeAccessTestObject
33 * @run testng/othervm -Diters=20000 compiler.unsafe.SunMiscUnsafeAccessTestObject
34 */
35
36 package compiler.unsafe;
37
38 import org.testng.annotations.Test;
39
40 import java.lang.reflect.Field;
41
42 import static org.testng.Assert.*;
43
44 public class SunMiscUnsafeAccessTestObject {
45 static final int ITERS = Integer.getInteger("iters", 1);
46 static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
47
48 static final sun.misc.Unsafe UNSAFE;
49
50 static final long V_OFFSET;
51
52 static final Object STATIC_V_BASE;
53
54 static final long STATIC_V_OFFSET;
55
56 static int ARRAY_OFFSET;
57
58 static int ARRAY_SHIFT;
59
60 static {
61 try {
62 Field f = sun.misc.Unsafe.class.getDeclaredField("theUnsafe");
63 f.setAccessible(true);
64 UNSAFE = (sun.misc.Unsafe) f.get(null);
65 } catch (Exception e) {
66 throw new RuntimeException("Unable to get Unsafe instance.", e);
67 }
68
69 try {
70 Field staticVField = SunMiscUnsafeAccessTestObject.class.getDeclaredField("static_v");
71 STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField);
72 STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField);
73 } catch (Exception e) {
74 throw new RuntimeException(e);
75 }
76
77 try {
78 Field vField = SunMiscUnsafeAccessTestObject.class.getDeclaredField("v");
79 V_OFFSET = UNSAFE.objectFieldOffset(vField);
80 } catch (Exception e) {
81 throw new RuntimeException(e);
82 }
83
84 ARRAY_OFFSET = UNSAFE.arrayBaseOffset(Object[].class);
85 int ascale = UNSAFE.arrayIndexScale(Object[].class);
86 ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
87 }
88
89 static Object static_v;
90
91 Object v;
92
93 @Test
94 public void testFieldInstance() {
95 SunMiscUnsafeAccessTestObject t = new SunMiscUnsafeAccessTestObject();
96 for (int c = 0; c < ITERS; c++) {
97 testAccess(t, V_OFFSET);
98 }
99 }
100
101 @Test
102 public void testFieldStatic() {
103 for (int c = 0; c < ITERS; c++) {
104 testAccess(STATIC_V_BASE, STATIC_V_OFFSET);
105 }
106 }
107
108 @Test
109 public void testArray() {
110 Object[] array = new Object[10];
111 for (int c = 0; c < ITERS; c++) {
112 for (int i = 0; i < array.length; i++) {
113 testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);
114 }
115 }
116 }
117
118
119 static void testAccess(Object base, long offset) {
120 // Plain
121 {
122 UNSAFE.putObject(base, offset, "foo");
123 Object x = UNSAFE.getObject(base, offset);
124 assertEquals(x, "foo", "set Object value");
125 }
126
127 // Volatile
128 {
129 UNSAFE.putObjectVolatile(base, offset, "bar");
130 Object x = UNSAFE.getObjectVolatile(base, offset);
131 assertEquals(x, "bar", "putVolatile Object value");
132 }
133
134 // Lazy
135 {
136 UNSAFE.putOrderedObject(base, offset, "foo");
137 Object x = UNSAFE.getObjectVolatile(base, offset);
138 assertEquals(x, "foo", "putRelease Object value");
139 }
140
141
142
143 UNSAFE.putObject(base, offset, "foo");
144
145 // Compare
146 {
147 boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "bar");
148 assertEquals(r, true, "success compareAndSwap Object");
149 Object x = UNSAFE.getObject(base, offset);
150 assertEquals(x, "bar", "success compareAndSwap Object value");
151 }
152
153 {
154 boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "baz");
155 assertEquals(r, false, "failing compareAndSwap Object");
156 Object x = UNSAFE.getObject(base, offset);
157 assertEquals(x, "bar", "failing compareAndSwap Object value");
158 }
159
160 UNSAFE.putObject(base, offset, "bar");
161
162 // Compare set and get
163 {
164 Object o = UNSAFE.getAndSetObject(base, offset, "foo");
165 assertEquals(o, "bar", "getAndSet Object");
166 Object x = UNSAFE.getObject(base, offset);
167 assertEquals(x, "foo", "getAndSet Object value");
168 }
169
170 }
171
172 }
173