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 short 28 * @modules java.base/jdk.internal.misc 29 * @run testng/othervm -Diters=100 -Xint JdkInternalMiscUnsafeAccessTestShort 30 * @run testng/othervm -Diters=20000 -XX:TieredStopAtLevel=1 JdkInternalMiscUnsafeAccessTestShort 31 * @run testng/othervm -Diters=20000 -XX:-TieredCompilation JdkInternalMiscUnsafeAccessTestShort 32 * @run testng/othervm -Diters=20000 JdkInternalMiscUnsafeAccessTestShort 33 */ 34 35 import org.testng.annotations.Test; 36 37 import java.lang.reflect.Field; 38 39 import static org.testng.Assert.*; 40 41 public class JdkInternalMiscUnsafeAccessTestShort { 42 static final int ITERS = Integer.getInteger("iters", 1); 43 static final int WEAK_ATTEMPTS = Integer.getInteger("weakAttempts", 10); 44 45 static final jdk.internal.misc.Unsafe UNSAFE; 46 47 static final long V_OFFSET; 48 49 static final Object STATIC_V_BASE; 50 51 static final long STATIC_V_OFFSET; 52 53 static int ARRAY_OFFSET; 54 55 static int ARRAY_SHIFT; 56 57 static { 58 try { 59 Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); 60 f.setAccessible(true); 61 UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); 62 } catch (Exception e) { 63 throw new RuntimeException("Unable to get Unsafe instance.", e); 64 } 65 66 try { 67 Field staticVField = JdkInternalMiscUnsafeAccessTestShort.class.getDeclaredField("static_v"); 68 STATIC_V_BASE = UNSAFE.staticFieldBase(staticVField); 69 STATIC_V_OFFSET = UNSAFE.staticFieldOffset(staticVField); 70 } catch (Exception e) { 71 throw new RuntimeException(e); 72 } 73 74 try { 75 Field vField = JdkInternalMiscUnsafeAccessTestShort.class.getDeclaredField("v"); 76 V_OFFSET = UNSAFE.objectFieldOffset(vField); 77 } catch (Exception e) { 78 throw new RuntimeException(e); 79 } 80 81 ARRAY_OFFSET = UNSAFE.arrayBaseOffset(short[].class); 82 int ascale = UNSAFE.arrayIndexScale(short[].class); 83 ARRAY_SHIFT = 31 - Integer.numberOfLeadingZeros(ascale); 84 } 85 86 static short static_v; 87 88 short v; 89 90 @Test 91 public void testFieldInstance() { 92 JdkInternalMiscUnsafeAccessTestShort t = new JdkInternalMiscUnsafeAccessTestShort(); 93 for (int c = 0; c < ITERS; c++) { 94 testAccess(t, V_OFFSET); 95 } 96 } 97 98 @Test 99 public void testFieldStatic() { 100 for (int c = 0; c < ITERS; c++) { 101 testAccess(STATIC_V_BASE, STATIC_V_OFFSET); 102 } 103 } 104 105 @Test 106 public void testArray() { 107 short[] array = new short[10]; 108 for (int c = 0; c < ITERS; c++) { 109 for (int i = 0; i < array.length; i++) { 110 testAccess(array, (((long) i) << ARRAY_SHIFT) + ARRAY_OFFSET); 111 } 112 } 113 } 114 115 @Test 116 public void testArrayOffHeap() { 117 int size = 10; 118 long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT); 119 try { 120 for (int c = 0; c < ITERS; c++) { 121 for (int i = 0; i < size; i++) { 122 testAccess(null, (((long) i) << ARRAY_SHIFT) + address); 123 } 124 } 125 } finally { 126 UNSAFE.freeMemory(address); 127 } 128 } 129 130 @Test 131 public void testArrayOffHeapDirect() { 132 int size = 10; 133 long address = UNSAFE.allocateMemory(size << ARRAY_SHIFT); 134 try { 135 for (int c = 0; c < ITERS; c++) { 136 for (int i = 0; i < size; i++) { 137 testAccess((((long) i) << ARRAY_SHIFT) + address); 138 } 139 } 140 } finally { 141 UNSAFE.freeMemory(address); 142 } 143 } 144 145 static void testAccess(Object base, long offset) { 146 // Plain 147 { 148 UNSAFE.putShort(base, offset, (short)1); 149 short x = UNSAFE.getShort(base, offset); 150 assertEquals(x, (short)1, "set short value"); 151 } 152 153 // Volatile 154 { 155 UNSAFE.putShortVolatile(base, offset, (short)2); 156 short x = UNSAFE.getShortVolatile(base, offset); 157 assertEquals(x, (short)2, "putVolatile short value"); 158 } 159 160 161 // Lazy 162 { 163 UNSAFE.putShortRelease(base, offset, (short)1); 164 short x = UNSAFE.getShortAcquire(base, offset); 165 assertEquals(x, (short)1, "putRelease short value"); 166 } 167 168 // Opaque 169 { 170 UNSAFE.putShortOpaque(base, offset, (short)2); 171 short x = UNSAFE.getShortOpaque(base, offset); 172 assertEquals(x, (short)2, "putOpaque short value"); 173 } 174 175 // Unaligned 176 { 177 UNSAFE.putShortUnaligned(base, offset, (short)2); 178 short x = UNSAFE.getShortUnaligned(base, offset); 179 assertEquals(x, (short)2, "putUnaligned short value"); 180 } 181 182 { 183 UNSAFE.putShortUnaligned(base, offset, (short)1, true); 184 short x = UNSAFE.getShortUnaligned(base, offset, true); 185 assertEquals(x, (short)1, "putUnaligned big endian short value"); 186 } 187 188 { 189 UNSAFE.putShortUnaligned(base, offset, (short)2, false); 190 short x = UNSAFE.getShortUnaligned(base, offset, false); 191 assertEquals(x, (short)2, "putUnaligned little endian short value"); 192 } 193 194 195 } 196 197 static void testAccess(long address) { 198 // Plain 199 { 200 UNSAFE.putShort(address, (short)1); 201 short x = UNSAFE.getShort(address); 202 assertEquals(x, (short)1, "set short value"); 203 } 204 } 205 } 206