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 char 28 * 29 * @modules java.base/jdk.internal.misc 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 36 package compiler.unsafe; 37 38 import org.testng.annotations.Test; 39 40 import java.lang.reflect.Field; 41 42 import static org.testng.Assert.*; 43 44 public 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.compareAndSwapChar(base, offset, '\u0123', '\u4567'); 202 assertEquals(r, true, "success compareAndSwap char"); 203 char x = UNSAFE.getChar(base, offset); 204 assertEquals(x, '\u4567', "success compareAndSwap char value"); 205 } 206 207 { 208 boolean r = UNSAFE.compareAndSwapChar(base, offset, '\u0123', '\u89AB'); 209 assertEquals(r, false, "failing compareAndSwap char"); 210 char x = UNSAFE.getChar(base, offset); 211 assertEquals(x, '\u4567', "failing compareAndSwap char value"); 212 } 213 214 // Advanced compare 215 { 216 char r = UNSAFE.compareAndExchangeCharVolatile(base, offset, '\u4567', '\u0123'); 217 assertEquals(r, '\u4567', "success compareAndExchangeVolatile char"); 218 char x = UNSAFE.getChar(base, offset); 219 assertEquals(x, '\u0123', "success compareAndExchangeVolatile char value"); 220 } 221 222 { 223 char r = UNSAFE.compareAndExchangeCharVolatile(base, offset, '\u4567', '\u89AB'); 224 assertEquals(r, '\u0123', "failing compareAndExchangeVolatile char"); 225 char x = UNSAFE.getChar(base, offset); 226 assertEquals(x, '\u0123', "failing compareAndExchangeVolatile 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.weakCompareAndSwapChar(base, offset, '\u0123', '\u4567'); 261 } 262 assertEquals(success, true, "weakCompareAndSwap char"); 263 char x = UNSAFE.getChar(base, offset); 264 assertEquals(x, '\u4567', "weakCompareAndSwap char value"); 265 } 266 267 { 268 boolean success = false; 269 for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) { 270 success = UNSAFE.weakCompareAndSwapCharAcquire(base, offset, '\u4567', '\u0123'); 271 } 272 assertEquals(success, true, "weakCompareAndSwapAcquire char"); 273 char x = UNSAFE.getChar(base, offset); 274 assertEquals(x, '\u0123', "weakCompareAndSwapAcquire char"); 275 } 276 277 { 278 boolean success = false; 279 for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) { 280 success = UNSAFE.weakCompareAndSwapCharRelease(base, offset, '\u0123', '\u4567'); 281 } 282 assertEquals(success, true, "weakCompareAndSwapRelease char"); 283 char x = UNSAFE.getChar(base, offset); 284 assertEquals(x, '\u4567', "weakCompareAndSwapRelease char"); 285 } 286 287 { 288 boolean success = false; 289 for (int c = 0; c < WEAK_ATTEMPTS && !success; c++) { 290 success = UNSAFE.weakCompareAndSwapCharVolatile(base, offset, '\u4567', '\u0123'); 291 } 292 assertEquals(success, true, "weakCompareAndSwapVolatile char"); 293 char x = UNSAFE.getChar(base, offset); 294 assertEquals(x, '\u0123', "weakCompareAndSwapVolatile 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