JdkInternalMiscUnsafeAccessTestChar.java revision 12777:0a7b3b558838 
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 8143628
27 * @summary Test unsafe access for char
28 *
29 * @modules java.base/jdk.internal.misc:+open
30 * @run testng/othervm -Diters=100   -Xint                   compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
31 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
32 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation  compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
33 * @run testng/othervm -Diters=20000                         compiler.unsafe.JdkInternalMiscUnsafeAccessTestChar
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 JdkInternalMiscUnsafeAccessTestChar {
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 = JdkInternalMiscUnsafeAccessTestChar.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 = JdkInternalMiscUnsafeAccessTestChar.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(char[].class);
85        int ascale = UNSAFE.arrayIndexScale(char[].class);
86        ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
87    }
88
89    static char static_v;
90
91    char v;
92
93    @Test
94    public void testFieldInstance() {
95        JdkInternalMiscUnsafeAccessTestChar t = new JdkInternalMiscUnsafeAccessTestChar();
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        char[] array = new char[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    @Test
119    public void testArrayOffHeap() {
120        int size = 10;
121        long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
122        try {
123            for (int c = 0; c < ITERS; c++) {
124                for (int i = 0; i < size; i++) {
125                    testAccess(null, (((long) i) << ARRAY_SHIFT) + address);
126                }
127            }
128        } finally {
129            UNSAFE.freeMemory(address);
130        }
131    }
132
133    @Test
134    public void testArrayOffHeapDirect() {
135        int size = 10;
136        long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
137        try {
138            for (int c = 0; c < ITERS; c++) {
139                for (int i = 0; i < size; i++) {
140                    testAccess((((long) i) << ARRAY_SHIFT) + address);
141                }
142            }
143        } finally {
144            UNSAFE.freeMemory(address);
145        }
146    }
147
148    static void testAccess(Object base, long offset) {
149        // Plain
150        {
151            UNSAFE.putChar(base, offset, '\u0123');
152            char x = UNSAFE.getChar(base, offset);
153            assertEquals(x, '\u0123', "set char value");
154        }
155
156        // Volatile
157        {
158            UNSAFE.putCharVolatile(base, offset, '\u4567');
159            char x = UNSAFE.getCharVolatile(base, offset);
160            assertEquals(x, '\u4567', "putVolatile char value");
161        }
162
163
164        // Lazy
165        {
166            UNSAFE.putCharRelease(base, offset, '\u0123');
167            char x = UNSAFE.getCharAcquire(base, offset);
168            assertEquals(x, '\u0123', "putRelease char value");
169        }
170
171        // Opaque
172        {
173            UNSAFE.putCharOpaque(base, offset, '\u4567');
174            char x = UNSAFE.getCharOpaque(base, offset);
175            assertEquals(x, '\u4567', "putOpaque char value");
176        }
177
178        // Unaligned
179        {
180            UNSAFE.putCharUnaligned(base, offset, '\u4567');
181            char x = UNSAFE.getCharUnaligned(base, offset);
182            assertEquals(x, '\u4567', "putUnaligned char value");
183        }
184
185        {
186            UNSAFE.putCharUnaligned(base, offset, '\u0123', true);
187            char x = UNSAFE.getCharUnaligned(base, offset, true);
188            assertEquals(x, '\u0123', "putUnaligned big endian char value");
189        }
190
191        {
192            UNSAFE.putCharUnaligned(base, offset, '\u4567', false);
193            char x = UNSAFE.getCharUnaligned(base, offset, false);
194            assertEquals(x, '\u4567', "putUnaligned little endian char value");
195        }
196
197        UNSAFE.putChar(base, offset, '\u0123');
198
199        // Compare
200        {
201            boolean r = UNSAFE.compareAndSetChar(base, offset, '\u0123', '\u4567');
202            assertEquals(r, true, "success compareAndSet char");
203            char x = UNSAFE.getChar(base, offset);
204            assertEquals(x, '\u4567', "success compareAndSet char value");
205        }
206
207        {
208            boolean r = UNSAFE.compareAndSetChar(base, offset, '\u0123', '\u89AB');
209            assertEquals(r, false, "failing compareAndSet char");
210            char x = UNSAFE.getChar(base, offset);
211            assertEquals(x, '\u4567', "failing compareAndSet char value");
212        }
213
214        // Advanced compare
215        {
216            char r = UNSAFE.compareAndExchangeChar(base, offset, '\u4567', '\u0123');
217            assertEquals(r, '\u4567', "success compareAndExchange char");
218            char x = UNSAFE.getChar(base, offset);
219            assertEquals(x, '\u0123', "success compareAndExchange char value");
220        }
221
222        {
223            char r = UNSAFE.compareAndExchangeChar(base, offset, '\u4567', '\u89AB');
224            assertEquals(r, '\u0123', "failing compareAndExchange char");
225            char x = UNSAFE.getChar(base, offset);
226            assertEquals(x, '\u0123', "failing compareAndExchange char value");
227        }
228
229        {
230            char r = UNSAFE.compareAndExchangeCharAcquire(base, offset, '\u0123', '\u4567');
231            assertEquals(r, '\u0123', "success compareAndExchangeAcquire char");
232            char x = UNSAFE.getChar(base, offset);
233            assertEquals(x, '\u4567', "success compareAndExchangeAcquire char value");
234        }
235
236        {
237            char r = UNSAFE.compareAndExchangeCharAcquire(base, offset, '\u0123', '\u89AB');
238            assertEquals(r, '\u4567', "failing compareAndExchangeAcquire char");
239            char x = UNSAFE.getChar(base, offset);
240            assertEquals(x, '\u4567', "failing compareAndExchangeAcquire char value");
241        }
242
243        {
244            char r = UNSAFE.compareAndExchangeCharRelease(base, offset, '\u4567', '\u0123');
245            assertEquals(r, '\u4567', "success compareAndExchangeRelease char");
246            char x = UNSAFE.getChar(base, offset);
247            assertEquals(x, '\u0123', "success compareAndExchangeRelease char value");
248        }
249
250        {
251            char r = UNSAFE.compareAndExchangeCharRelease(base, offset, '\u4567', '\u89AB');
252            assertEquals(r, '\u0123', "failing compareAndExchangeRelease char");
253            char x = UNSAFE.getChar(base, offset);
254            assertEquals(x, '\u0123', "failing compareAndExchangeRelease char value");
255        }
256
257        {
258            boolean success = false;
259            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
260                success = UNSAFE.weakCompareAndSetCharPlain(base, offset, '\u0123', '\u4567');
261            }
262            assertEquals(success, true, "weakCompareAndSetPlain char");
263            char x = UNSAFE.getChar(base, offset);
264            assertEquals(x, '\u4567', "weakCompareAndSetPlain char value");
265        }
266
267        {
268            boolean success = false;
269            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
270                success = UNSAFE.weakCompareAndSetCharAcquire(base, offset, '\u4567', '\u0123');
271            }
272            assertEquals(success, true, "weakCompareAndSetAcquire char");
273            char x = UNSAFE.getChar(base, offset);
274            assertEquals(x, '\u0123', "weakCompareAndSetAcquire char");
275        }
276
277        {
278            boolean success = false;
279            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
280                success = UNSAFE.weakCompareAndSetCharRelease(base, offset, '\u0123', '\u4567');
281            }
282            assertEquals(success, true, "weakCompareAndSetRelease char");
283            char x = UNSAFE.getChar(base, offset);
284            assertEquals(x, '\u4567', "weakCompareAndSetRelease char");
285        }
286
287        {
288            boolean success = false;
289            for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
290                success = UNSAFE.weakCompareAndSetChar(base, offset, '\u4567', '\u0123');
291            }
292            assertEquals(success, true, "weakCompareAndSet char");
293            char x = UNSAFE.getChar(base, offset);
294            assertEquals(x, '\u0123', "weakCompareAndSet char");
295        }
296
297        UNSAFE.putChar(base, offset, '\u4567');
298
299        // Compare set and get
300        {
301            char o = UNSAFE.getAndSetChar(base, offset, '\u0123');
302            assertEquals(o, '\u4567', "getAndSet char");
303            char x = UNSAFE.getChar(base, offset);
304            assertEquals(x, '\u0123', "getAndSet char value");
305        }
306
307        UNSAFE.putChar(base, offset, '\u0123');
308
309        // get and add, add and get
310        {
311            char o = UNSAFE.getAndAddChar(base, offset, '\u4567');
312            assertEquals(o, '\u0123', "getAndAdd char");
313            char x = UNSAFE.getChar(base, offset);
314            assertEquals(x, (char)('\u0123' + '\u4567'), "getAndAdd char");
315        }
316    }
317
318    static void testAccess(long address) {
319        // Plain
320        {
321            UNSAFE.putChar(address, '\u0123');
322            char x = UNSAFE.getChar(address);
323            assertEquals(x, '\u0123', "set char value");
324        }
325    }
326}
327