JdkInternalMiscUnsafeAccessTestObject.java revision 12290:8953c0318163 
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 java.base/jdk.internal.misc:+open
30 * @run testng/othervm -Diters=100   -Xint                   compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
31 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
32 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation  compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
33 * @run testng/othervm -Diters=20000                         compiler.unsafe.JdkInternalMiscUnsafeAccessTestObject
34 */
35
36package compiler.unsafe;
37
38import org.testng.annotations.Test;
39
40import java.lang.reflect.Field;
41
42import static org.testng.Assert.*;
43
44public class JdkInternalMiscUnsafeAccessTestObject {
45    static final int ITERS = Integer.getInteger("iters", 1);
46    static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
47
48    static final jdk.internal.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 = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
63            f.setAccessible(true);
64            UNSAFE = (jdk.internal.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 = JdkInternalMiscUnsafeAccessTestObject.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 = JdkInternalMiscUnsafeAccessTestObject.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        JdkInternalMiscUnsafeAccessTestObject t = new JdkInternalMiscUnsafeAccessTestObject();
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
135        // Lazy
136        {
137            UNSAFE.putObjectRelease(base, offset, "foo");
138            Object x = UNSAFE.getObjectAcquire(base, offset);
139            assertEquals(x, "foo", "putRelease Object value");
140        }
141
142        // Opaque
143        {
144            UNSAFE.putObjectOpaque(base, offset, "bar");
145            Object x = UNSAFE.getObjectOpaque(base, offset);
146            assertEquals(x, "bar", "putOpaque Object value");
147        }
148
149
150        UNSAFE.putObject(base, offset, "foo");
151
152        // Compare
153        {
154            boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "bar");
155            assertEquals(r, true, "success compareAndSwap Object");
156            Object x = UNSAFE.getObject(base, offset);
157            assertEquals(x, "bar", "success compareAndSwap Object value");
158        }
159
160        {
161            boolean r = UNSAFE.compareAndSwapObject(base, offset, "foo", "baz");
162            assertEquals(r, false, "failing compareAndSwap Object");
163            Object x = UNSAFE.getObject(base, offset);
164            assertEquals(x, "bar", "failing compareAndSwap Object value");
165        }
166
167        // Advanced compare
168        {
169            Object r = UNSAFE.compareAndExchangeObjectVolatile(base, offset, "bar", "foo");
170            assertEquals(r, "bar", "success compareAndExchangeVolatile Object");
171            Object x = UNSAFE.getObject(base, offset);
172            assertEquals(x, "foo", "success compareAndExchangeVolatile Object value");
173        }
174
175        {
176            Object r = UNSAFE.compareAndExchangeObjectVolatile(base, offset, "bar", "baz");
177            assertEquals(r, "foo", "failing compareAndExchangeVolatile Object");
178            Object x = UNSAFE.getObject(base, offset);
179            assertEquals(x, "foo", "failing compareAndExchangeVolatile Object value");
180        }
181
182        {
183            Object r = UNSAFE.compareAndExchangeObjectAcquire(base, offset, "foo", "bar");
184            assertEquals(r, "foo", "success compareAndExchangeAcquire Object");
185            Object x = UNSAFE.getObject(base, offset);
186            assertEquals(x, "bar", "success compareAndExchangeAcquire Object value");
187        }
188
189        {
190            Object r = UNSAFE.compareAndExchangeObjectAcquire(base, offset, "foo", "baz");
191            assertEquals(r, "bar", "failing compareAndExchangeAcquire Object");
192            Object x = UNSAFE.getObject(base, offset);
193            assertEquals(x, "bar", "failing compareAndExchangeAcquire Object value");
194        }
195
196        {
197            Object r = UNSAFE.compareAndExchangeObjectRelease(base, offset, "bar", "foo");
198            assertEquals(r, "bar", "success compareAndExchangeRelease Object");
199            Object x = UNSAFE.getObject(base, offset);
200            assertEquals(x, "foo", "success compareAndExchangeRelease Object value");
201        }
202
203        {
204            Object r = UNSAFE.compareAndExchangeObjectRelease(base, offset, "bar", "baz");
205            assertEquals(r, "foo", "failing compareAndExchangeRelease Object");
206            Object x = UNSAFE.getObject(base, offset);
207            assertEquals(x, "foo", "failing compareAndExchangeRelease Object value");
208        }
209
210        {
211            boolean success = false;
212            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
213                success = UNSAFE.weakCompareAndSwapObject(base, offset, "foo", "bar");
214            }
215            assertEquals(success, true, "weakCompareAndSwap Object");
216            Object x = UNSAFE.getObject(base, offset);
217            assertEquals(x, "bar", "weakCompareAndSwap Object value");
218        }
219
220        {
221            boolean success = false;
222            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
223                success = UNSAFE.weakCompareAndSwapObjectAcquire(base, offset, "bar", "foo");
224            }
225            assertEquals(success, true, "weakCompareAndSwapAcquire Object");
226            Object x = UNSAFE.getObject(base, offset);
227            assertEquals(x, "foo", "weakCompareAndSwapAcquire Object");
228        }
229
230        {
231            boolean success = false;
232            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
233                success = UNSAFE.weakCompareAndSwapObjectRelease(base, offset, "foo", "bar");
234            }
235            assertEquals(success, true, "weakCompareAndSwapRelease Object");
236            Object x = UNSAFE.getObject(base, offset);
237            assertEquals(x, "bar", "weakCompareAndSwapRelease Object");
238        }
239
240        {
241            boolean success = false;
242            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
243                success = UNSAFE.weakCompareAndSwapObjectVolatile(base, offset, "bar", "foo");
244            }
245            assertEquals(success, true, "weakCompareAndSwapVolatile Object");
246            Object x = UNSAFE.getObject(base, offset);
247            assertEquals(x, "foo", "weakCompareAndSwapVolatile Object");
248        }
249
250        UNSAFE.putObject(base, offset, "bar");
251
252        // Compare set and get
253        {
254            Object o = UNSAFE.getAndSetObject(base, offset, "foo");
255            assertEquals(o, "bar", "getAndSet Object");
256            Object x = UNSAFE.getObject(base, offset);
257            assertEquals(x, "foo", "getAndSet Object value");
258        }
259
260    }
261
262}
263
264