SunMiscUnsafeAccessTestFloat.java revision 12827:5242609b8088 
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 float
28 *
29 * @modules jdk.unsupported/sun.misc
30 * @run testng/othervm -Diters=100   -Xint                   compiler.unsafe.SunMiscUnsafeAccessTestFloat
31 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 compiler.unsafe.SunMiscUnsafeAccessTestFloat
32 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation  compiler.unsafe.SunMiscUnsafeAccessTestFloat
33 * @run testng/othervm -Diters=20000                         compiler.unsafe.SunMiscUnsafeAccessTestFloat
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 SunMiscUnsafeAccessTestFloat {
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 = SunMiscUnsafeAccessTestFloat.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 = SunMiscUnsafeAccessTestFloat.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(float[].class);
85        int ascale = UNSAFE.arrayIndexScale(float[].class);
86        ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale);
87    }
88
89    static float static_v;
90
91    float v;
92
93    @Test
94    public void testFieldInstance() {
95        SunMiscUnsafeAccessTestFloat t = new SunMiscUnsafeAccessTestFloat();
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        float[] array = new float[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.putFloat(base, offset, 1.0f);
152            float x = UNSAFE.getFloat(base, offset);
153            assertEquals(x, 1.0f, "set float value");
154        }
155
156        // Volatile
157        {
158            UNSAFE.putFloatVolatile(base, offset, 2.0f);
159            float x = UNSAFE.getFloatVolatile(base, offset);
160            assertEquals(x, 2.0f, "putVolatile float value");
161        }
162
163
164
165
166
167    }
168
169    static void testAccess(long address) {
170        // Plain
171        {
172            UNSAFE.putFloat(address, 1.0f);
173            float x = UNSAFE.getFloat(address);
174            assertEquals(x, 1.0f, "set float value");
175        }
176    }
177}
178