1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
|
/*
* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8143628
* @summary Test unsafe access for float
*
* @modules java.base/jdk.internal.misc:+open
* @run testng/othervm -Diters=100 -Xint compiler.unsafe.JdkInternalMiscUnsafeAccessTestFloat
* @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.JdkInternalMiscUnsafeAccessTestFloat
* @run testng/othervm -Diters=20000 -XX:-TieredCompilation compiler.unsafe.JdkInternalMiscUnsafeAccessTestFloat
* @run testng/othervm -Diters=20000 compiler.unsafe.JdkInternalMiscUnsafeAccessTestFloat
*/
package compiler.unsafe;
import org.testng.annotations.Test;
import java.lang.reflect.Field;
import static org.testng.Assert.*;
public class JdkInternalMiscUnsafeAccessTestFloat {
static final int ITERS = Integer.getInteger("iters", 1);
static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10);
static final jdk.internal.misc.Unsafe UNSAFE;
static final long V_OFFSET;
static final Object STATIC_V_BASE;
static final long STATIC_V_OFFSET;
static int ARRAY_OFFSET;
static int ARRAY_SHIFT;
static {
try {
Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe");
f.setAccessible(true);
UNSAFE = (jdk.internal.misc.Unsafe) f.get(null);
} catch (Exception e) {
throw new RuntimeException("Unable to get Unsafe instance.", e);
}
try {
Field staticVField = JdkInternalMiscUnsafeAccessTestFloat.class.getDeclaredField("static_v");
STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField);
STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField);
} catch (Exception e) {
throw new RuntimeException(e);
}
try {
Field vField = JdkInternalMiscUnsafeAccessTestFloat.class.getDeclaredField("v");
V_OFFSET = UNSAFE.objectFieldOffset(vField);
} catch (Exception e) {
throw new RuntimeException(e);
}
ARRAY_OFFSET = UNSAFE.arrayBaseOffset(float[].class);
int ascale = UNSAFE.arrayIndexScale(float[].class);
ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
}
static float static_v;
float v;
@Test
public void testFieldInstance() {
JdkInternalMiscUnsafeAccessTestFloat t = new JdkInternalMiscUnsafeAccessTestFloat();
for (int c = 0; c < ITERS; c++) {
testAccess(t, V_OFFSET);
}
}
@Test
public void testFieldStatic() {
for (int c = 0; c < ITERS; c++) {
testAccess(STATIC_V_BASE, STATIC_V_OFFSET);
}
}
@Test
public void testArray() {
float[] array = new float[10];
for (int c = 0; c < ITERS; c++) {
for (int i = 0; i < array.length; i++) {
testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET);
}
}
}
@Test
public void testArrayOffHeap() {
int size = 10;
long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
try {
for (int c = 0; c < ITERS; c++) {
for (int i = 0; i < size; i++) {
testAccess(null, (((long) i) << ARRAY_SHIFT) + address);
}
}
} finally {
UNSAFE.freeMemory(address);
}
}
@Test
public void testArrayOffHeapDirect() {
int size = 10;
long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT);
try {
for (int c = 0; c < ITERS; c++) {
for (int i = 0; i < size; i++) {
testAccess((((long) i) << ARRAY_SHIFT) + address);
}
}
} finally {
UNSAFE.freeMemory(address);
}
}
static void testAccess(Object base, long offset) {
// Plain
{
UNSAFE.putFloat(base, offset, 1.0f);
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "set float value");
}
// Volatile
{
UNSAFE.putFloatVolatile(base, offset, 2.0f);
float x = UNSAFE.getFloatVolatile(base, offset);
assertEquals(x, 2.0f, "putVolatile float value");
}
// Lazy
{
UNSAFE.putFloatRelease(base, offset, 1.0f);
float x = UNSAFE.getFloatAcquire(base, offset);
assertEquals(x, 1.0f, "putRelease float value");
}
// Opaque
{
UNSAFE.putFloatOpaque(base, offset, 2.0f);
float x = UNSAFE.getFloatOpaque(base, offset);
assertEquals(x, 2.0f, "putOpaque float value");
}
UNSAFE.putFloat(base, offset, 1.0f);
// Compare
{
boolean r = UNSAFE.compareAndSetFloat(base, offset, 1.0f, 2.0f);
assertEquals(r, true, "success compareAndSet float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 2.0f, "success compareAndSet float value");
}
{
boolean r = UNSAFE.compareAndSetFloat(base, offset, 1.0f, 3.0f);
assertEquals(r, false, "failing compareAndSet float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 2.0f, "failing compareAndSet float value");
}
// Advanced compare
{
float r = UNSAFE.compareAndExchangeFloat(base, offset, 2.0f, 1.0f);
assertEquals(r, 2.0f, "success compareAndExchange float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "success compareAndExchange float value");
}
{
float r = UNSAFE.compareAndExchangeFloat(base, offset, 2.0f, 3.0f);
assertEquals(r, 1.0f, "failing compareAndExchange float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "failing compareAndExchange float value");
}
{
float r = UNSAFE.compareAndExchangeFloatAcquire(base, offset, 1.0f, 2.0f);
assertEquals(r, 1.0f, "success compareAndExchangeAcquire float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 2.0f, "success compareAndExchangeAcquire float value");
}
{
float r = UNSAFE.compareAndExchangeFloatAcquire(base, offset, 1.0f, 3.0f);
assertEquals(r, 2.0f, "failing compareAndExchangeAcquire float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 2.0f, "failing compareAndExchangeAcquire float value");
}
{
float r = UNSAFE.compareAndExchangeFloatRelease(base, offset, 2.0f, 1.0f);
assertEquals(r, 2.0f, "success compareAndExchangeRelease float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "success compareAndExchangeRelease float value");
}
{
float r = UNSAFE.compareAndExchangeFloatRelease(base, offset, 2.0f, 3.0f);
assertEquals(r, 1.0f, "failing compareAndExchangeRelease float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "failing compareAndExchangeRelease float value");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSetFloatPlain(base, offset, 1.0f, 2.0f);
}
assertEquals(success, true, "weakCompareAndSetPlain float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 2.0f, "weakCompareAndSetPlain float value");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSetFloatAcquire(base, offset, 2.0f, 1.0f);
}
assertEquals(success, true, "weakCompareAndSetAcquire float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "weakCompareAndSetAcquire float");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSetFloatRelease(base, offset, 1.0f, 2.0f);
}
assertEquals(success, true, "weakCompareAndSetRelease float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 2.0f, "weakCompareAndSetRelease float");
}
{
boolean success = false;
for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) {
success = UNSAFE.weakCompareAndSetFloat(base, offset, 2.0f, 1.0f);
}
assertEquals(success, true, "weakCompareAndSet float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "weakCompareAndSet float");
}
UNSAFE.putFloat(base, offset, 2.0f);
// Compare set and get
{
float o = UNSAFE.getAndSetFloat(base, offset, 1.0f);
assertEquals(o, 2.0f, "getAndSet float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, 1.0f, "getAndSet float value");
}
UNSAFE.putFloat(base, offset, 1.0f);
// get and add, add and get
{
float o = UNSAFE.getAndAddFloat(base, offset, 2.0f);
assertEquals(o, 1.0f, "getAndAdd float");
float x = UNSAFE.getFloat(base, offset);
assertEquals(x, (float)(1.0f + 2.0f), "getAndAdd float");
}
}
static void testAccess(long address) {
// Plain
{
UNSAFE.putFloat(address, 1.0f);
float x = UNSAFE.getFloat(address);
assertEquals(x, 1.0f, "set float value");
}
}
}
|
