1 /* 2 * Copyright (c) 2000, 2021, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal.misc; 27 28 import dalvik.annotation.optimization.FastNative; 29 import jdk.internal.vm.annotation.IntrinsicCandidate; 30 import sun.reflect.Reflection; 31 32 import java.lang.reflect.Field; 33 import java.lang.reflect.Modifier; 34 35 import static jdk.internal.misc.UnsafeConstants.*; 36 37 /** 38 * A collection of methods for performing low-level, unsafe operations. 39 * Although the class and all methods are public, use of this class is 40 * limited because only trusted code can obtain instances of it. 41 * 42 * <em>Note:</em> It is the responsibility of the caller to make sure 43 * arguments are checked before methods of this class are 44 * called. While some rudimentary checks are performed on the input, 45 * the checks are best effort and when performance is an overriding 46 * priority, as when methods of this class are optimized by the 47 * runtime compiler, some or all checks (if any) may be elided. Hence, 48 * the caller must not rely on the checks and corresponding 49 * exceptions! 50 * 51 * @author John R. Rose 52 * @see #getUnsafe 53 */ 54 public final class Unsafe { 55 /** Traditional dalvik name. */ 56 private static final Unsafe THE_ONE = new Unsafe(); 57 58 private static final Unsafe theUnsafe = THE_ONE; 59 60 /** 61 * This class is only privately instantiable. 62 */ Unsafe()63 private Unsafe() {} 64 65 /** 66 * Gets the unique instance of this class. This is only allowed in 67 * very limited situations. 68 */ getUnsafe()69 public static Unsafe getUnsafe() { 70 // BEGIN Android-changed: Check caller is in bootclasspath. 71 // return theUnsafe; 72 Class<?> caller = Reflection.getCallerClass(); 73 /* 74 * Only code on the bootclasspath is allowed to get at the 75 * Unsafe instance. 76 */ 77 ClassLoader calling = (caller == null) ? null : caller.getClassLoader(); 78 if ((calling != null) && (calling != Unsafe.class.getClassLoader())) { 79 throw new SecurityException("Unsafe access denied"); 80 // END Android-changed: Check caller is in bootclasspath. 81 } 82 83 return THE_ONE; 84 } 85 86 /// peek and poke operations 87 /// (compilers should optimize these to memory ops) 88 89 // These work on object fields in the Java heap. 90 // They will not work on elements of packed arrays. 91 92 /** 93 * Fetches a value from a given Java variable. 94 * More specifically, fetches a field or array element within the given 95 * object {@code o} at the given offset, or (if {@code o} is null) 96 * from the memory address whose numerical value is the given offset. 97 * <p> 98 * The results are undefined unless one of the following cases is true: 99 * <ul> 100 * <li>The offset was obtained from {@link #objectFieldOffset} on 101 * the {@link java.lang.reflect.Field} of some Java field and the object 102 * referred to by {@code o} is of a class compatible with that 103 * field's class. 104 * 105 * <li>The offset and object reference {@code o} (either null or 106 * non-null) were both obtained via {@link #staticFieldOffset} 107 * and {@link #staticFieldBase} (respectively) from the 108 * reflective {@link Field} representation of some Java field. 109 * 110 * <li>The object referred to by {@code o} is an array, and the offset 111 * is an integer of the form {@code B+N*S}, where {@code N} is 112 * a valid index into the array, and {@code B} and {@code S} are 113 * the values obtained by {@link #arrayBaseOffset} and {@link 114 * #arrayIndexScale} (respectively) from the array's class. The value 115 * referred to is the {@code N}<em>th</em> element of the array. 116 * 117 * </ul> 118 * <p> 119 * If one of the above cases is true, the call references a specific Java 120 * variable (field or array element). However, the results are undefined 121 * if that variable is not in fact of the type returned by this method. 122 * <p> 123 * This method refers to a variable by means of two parameters, and so 124 * it provides (in effect) a <em>double-register</em> addressing mode 125 * for Java variables. When the object reference is null, this method 126 * uses its offset as an absolute address. This is similar in operation 127 * to methods such as {@link #getInt(long)}, which provide (in effect) a 128 * <em>single-register</em> addressing mode for non-Java variables. 129 * However, because Java variables may have a different layout in memory 130 * from non-Java variables, programmers should not assume that these 131 * two addressing modes are ever equivalent. Also, programmers should 132 * remember that offsets from the double-register addressing mode cannot 133 * be portably confused with longs used in the single-register addressing 134 * mode. 135 * 136 * @param o Java heap object in which the variable resides, if any, else 137 * null 138 * @param offset indication of where the variable resides in a Java heap 139 * object, if any, else a memory address locating the variable 140 * statically 141 * @return the value fetched from the indicated Java variable 142 * @throws RuntimeException No defined exceptions are thrown, not even 143 * {@link NullPointerException} 144 */ 145 // Android-added: FastNative annotation. 146 @FastNative 147 @IntrinsicCandidate getInt(Object o, long offset)148 public native int getInt(Object o, long offset); 149 150 /** 151 * Stores a value into a given Java variable. 152 * <p> 153 * The first two parameters are interpreted exactly as with 154 * {@link #getInt(Object, long)} to refer to a specific 155 * Java variable (field or array element). The given value 156 * is stored into that variable. 157 * <p> 158 * The variable must be of the same type as the method 159 * parameter {@code x}. 160 * 161 * @param o Java heap object in which the variable resides, if any, else 162 * null 163 * @param offset indication of where the variable resides in a Java heap 164 * object, if any, else a memory address locating the variable 165 * statically 166 * @param x the value to store into the indicated Java variable 167 * @throws RuntimeException No defined exceptions are thrown, not even 168 * {@link NullPointerException} 169 */ 170 // Android-added: FastNative annotation. 171 @FastNative 172 @IntrinsicCandidate putInt(Object o, long offset, int x)173 public native void putInt(Object o, long offset, int x); 174 175 /** 176 * Fetches a reference value from a given Java variable. 177 * @see #getInt(Object, long) 178 */ 179 // Android-added: FastNative annotation. 180 @FastNative 181 @IntrinsicCandidate getReference(Object o, long offset)182 public native Object getReference(Object o, long offset); 183 184 /** 185 * Stores a reference value into a given Java variable. 186 * <p> 187 * Unless the reference {@code x} being stored is either null 188 * or matches the field type, the results are undefined. 189 * If the reference {@code o} is non-null, card marks or 190 * other store barriers for that object (if the VM requires them) 191 * are updated. 192 * @see #putInt(Object, long, int) 193 */ 194 // Android-added: FastNative annotation. 195 @FastNative 196 @IntrinsicCandidate putReference(Object o, long offset, Object x)197 public native void putReference(Object o, long offset, Object x); 198 199 /** @see #getInt(Object, long) */ 200 // Android-added: FastNative annotation. 201 @FastNative 202 @IntrinsicCandidate getBoolean(Object o, long offset)203 public native boolean getBoolean(Object o, long offset); 204 205 /** @see #putInt(Object, long, int) */ 206 // Android-added: FastNative annotation. 207 @FastNative 208 @IntrinsicCandidate putBoolean(Object o, long offset, boolean x)209 public native void putBoolean(Object o, long offset, boolean x); 210 211 /** @see #getInt(Object, long) */ 212 // Android-added: FastNative annotation. 213 @FastNative 214 @IntrinsicCandidate getByte(Object o, long offset)215 public native byte getByte(Object o, long offset); 216 217 /** @see #putInt(Object, long, int) */ 218 // Android-added: FastNative annotation. 219 @FastNative 220 @IntrinsicCandidate putByte(Object o, long offset, byte x)221 public native void putByte(Object o, long offset, byte x); 222 223 /** @see #getInt(Object, long) */ 224 // Android-added: FastNative annotation. 225 @FastNative 226 @IntrinsicCandidate getShort(Object o, long offset)227 public native short getShort(Object o, long offset); 228 229 /** @see #putInt(Object, long, int) */ 230 // Android-added: FastNative annotation. 231 @FastNative 232 @IntrinsicCandidate putShort(Object o, long offset, short x)233 public native void putShort(Object o, long offset, short x); 234 235 /** @see #getInt(Object, long) */ 236 // Android-added: FastNative annotation. 237 @FastNative 238 @IntrinsicCandidate getChar(Object o, long offset)239 public native char getChar(Object o, long offset); 240 241 /** @see #putInt(Object, long, int) */ 242 // Android-added: FastNative annotation. 243 @FastNative 244 @IntrinsicCandidate putChar(Object o, long offset, char x)245 public native void putChar(Object o, long offset, char x); 246 247 /** @see #getInt(Object, long) */ 248 // Android-added: FastNative annotation. 249 @FastNative 250 @IntrinsicCandidate getLong(Object o, long offset)251 public native long getLong(Object o, long offset); 252 253 /** @see #putInt(Object, long, int) */ 254 // Android-added: FastNative annotation. 255 @FastNative 256 @IntrinsicCandidate putLong(Object o, long offset, long x)257 public native void putLong(Object o, long offset, long x); 258 259 /** @see #getInt(Object, long) */ 260 // Android-added: FastNative annotation. 261 @FastNative 262 @IntrinsicCandidate getFloat(Object o, long offset)263 public native float getFloat(Object o, long offset); 264 265 /** @see #putInt(Object, long, int) */ 266 // Android-added: FastNative annotation. 267 @FastNative 268 @IntrinsicCandidate putFloat(Object o, long offset, float x)269 public native void putFloat(Object o, long offset, float x); 270 271 /** @see #getInt(Object, long) */ 272 // Android-added: FastNative annotation. 273 @FastNative 274 @IntrinsicCandidate getDouble(Object o, long offset)275 public native double getDouble(Object o, long offset); 276 277 /** @see #putInt(Object, long, int) */ 278 // Android-added: FastNative annotation. 279 @FastNative 280 @IntrinsicCandidate putDouble(Object o, long offset, double x)281 public native void putDouble(Object o, long offset, double x); 282 283 // BEGIN Android-removed: Not used in Android. 284 /* 285 /** 286 * Fetches a native pointer from a given memory address. If the address is 287 * zero, or does not point into a block obtained from {@link 288 * #allocateMemory}, the results are undefined. 289 * 290 * <p>If the native pointer is less than 64 bits wide, it is extended as 291 * an unsigned number to a Java long. The pointer may be indexed by any 292 * given byte offset, simply by adding that offset (as a simple integer) to 293 * the long representing the pointer. The number of bytes actually read 294 * from the target address may be determined by consulting {@link 295 * #addressSize}. 296 * 297 * @see #allocateMemory 298 * @see #getInt(Object, long) 299 * / 300 @ForceInline 301 public long getAddress(Object o, long offset) { 302 if (ADDRESS_SIZE == 4) { 303 return Integer.toUnsignedLong(getInt(o, offset)); 304 } else { 305 return getLong(o, offset); 306 } 307 } 308 309 /** 310 * Stores a native pointer into a given memory address. If the address is 311 * zero, or does not point into a block obtained from {@link 312 * #allocateMemory}, the results are undefined. 313 * 314 * <p>The number of bytes actually written at the target address may be 315 * determined by consulting {@link #addressSize}. 316 * 317 * @see #allocateMemory 318 * @see #putInt(Object, long, int) 319 * / 320 @ForceInline 321 public void putAddress(Object o, long offset, long x) { 322 if (ADDRESS_SIZE == 4) { 323 putInt(o, offset, (int)x); 324 } else { 325 putLong(o, offset, x); 326 } 327 } 328 329 // These read VM internal data. 330 331 /** 332 * Fetches an uncompressed reference value from a given native variable 333 * ignoring the VM's compressed references mode. 334 * 335 * @param address a memory address locating the variable 336 * @return the value fetched from the indicated native variable 337 * / 338 public native Object getUncompressedObject(long address); 339 340 */ 341 // END Android-removed: Not used in Android. 342 343 /** 344 * Fetches a value from a given memory address. If the address is zero, or 345 * does not point into a block obtained from {@link #allocateMemory}, the 346 * results are undefined. 347 * 348 * @see #allocateMemory 349 */ 350 // BEGIN Android-changed: Implemented as native call. 351 /* 352 @ForceInline 353 public byte getByte(long address) { 354 return getByte(null, address); 355 } 356 */ 357 @FastNative getByte(long address)358 public native byte getByte(long address); 359 // END Android-changed: Implemented as native call. 360 361 /** 362 * Stores a value into a given memory address. If the address is zero, or 363 * does not point into a block obtained from {@link #allocateMemory}, the 364 * results are undefined. 365 * 366 * @see #getByte(long) 367 */ 368 // BEGIN Android-changed: Implemented as native call. 369 /* 370 @ForceInline 371 public void putByte(long address, byte x) { 372 putByte(null, address, x); 373 } 374 */ 375 @FastNative putByte(long address, byte x)376 public native void putByte(long address, byte x); 377 // END Android-changed: Implemented as native call. 378 379 380 /** @see #getByte(long) */ 381 // BEGIN Android-changed: Implemented as native call. 382 /* 383 @ForceInline 384 public short getShort(long address) { 385 return getShort(null, address); 386 } 387 */ 388 @FastNative getShort(long address)389 public native short getShort(long address); 390 // END Android-changed: Implemented as native call. 391 392 /** @see #putByte(long, byte) */ 393 // BEGIN Android-changed: Implemented as native call. 394 /* 395 @ForceInline 396 public void putShort(long address, short x) { 397 putShort(null, address, x); 398 } 399 */ 400 @FastNative putShort(long address, short x)401 public native void putShort(long address, short x); 402 // END Android-changed: Implemented as native call. 403 404 /** @see #getByte(long) */ 405 // BEGIN Android-changed: Implemented as native call. 406 /* 407 @ForceInline 408 public char getChar(long address) { 409 return getChar(null, address); 410 } 411 */ 412 @FastNative getChar(long address)413 public native char getChar(long address); 414 // END Android-changed: Implemented as native call. 415 416 /** @see #putByte(long, byte) */ 417 // BEGIN Android-changed: Implemented as native call. 418 /* 419 @ForceInline 420 public void putChar(long address, char x) { 421 putChar(null, address, x); 422 } 423 */ 424 @FastNative putChar(long address, char x)425 public native void putChar(long address, char x); 426 // END Android-changed: Implemented as native call. 427 428 /** @see #getByte(long) */ 429 // BEGIN Android-changed: Implemented as native call. 430 /* 431 @ForceInline 432 public int getInt(long address) { 433 return getInt(null, address); 434 } 435 */ 436 @FastNative getInt(long address)437 public native int getInt(long address); 438 // END Android-changed: Implemented as native call. 439 440 /** @see #putByte(long, byte) */ 441 // BEGIN Android-changed: Implemented as native call. 442 /* 443 @ForceInline 444 public void putInt(long address, int x) { 445 putInt(null, address, x); 446 } 447 */ 448 @FastNative putInt(long address, int x)449 public native void putInt(long address, int x); 450 // END Android-changed: Implemented as native call. 451 452 /** @see #getByte(long) */ 453 // BEGIN Android-changed: Implemented as native call. 454 /* 455 @ForceInline 456 public long getLong(long address) { 457 return getLong(null, address); 458 } 459 */ 460 @FastNative getLong(long address)461 public native long getLong(long address); 462 // END Android-changed: Implemented as native call. 463 464 /** @see #putByte(long, byte) */ 465 // BEGIN Android-changed: Implemented as native call. 466 /* 467 @ForceInline 468 public void putLong(long address, long x) { 469 putLong(null, address, x); 470 } 471 */ 472 @FastNative putLong(long address, long x)473 public native void putLong(long address, long x); 474 // END Android-changed: Implemented as native call. 475 476 /** @see #getByte(long) */ 477 // BEGIN Android-changed: Implemented as native call. 478 /* 479 @ForceInline 480 public float getFloat(long address) { 481 return getFloat(null, address); 482 } 483 */ 484 @FastNative getFloat(long address)485 public native float getFloat(long address); 486 // END Android-changed: Implemented as native call. 487 488 /** @see #putByte(long, byte) */ 489 // BEGIN Android-changed: Implemented as native call. 490 /* 491 @ForceInline 492 public void putFloat(long address, float x) { 493 putFloat(null, address, x); 494 } 495 */ 496 @FastNative putFloat(long address, float x)497 public native void putFloat(long address, float x); 498 // END Android-changed: Implemented as native call. 499 500 /** @see #getByte(long) */ 501 // BEGIN Android-changed: Implemented as native call. 502 /* 503 @ForceInline 504 public double getDouble(long address) { 505 return getDouble(null, address); 506 } 507 */ 508 @FastNative getDouble(long address)509 public native double getDouble(long address); 510 // END Android-changed: Implemented as native call. 511 512 /** @see #putByte(long, byte) */ 513 // BEGIN Android-changed: Implemented as native call. 514 /* 515 @ForceInline 516 public void putDouble(long address, double x) { 517 putDouble(null, address, x); 518 } 519 */ 520 @FastNative putDouble(long address, double x)521 public native void putDouble(long address, double x); 522 // END Android-changed: Implemented as native call. 523 524 // BEGIN Android-removed: Not used in Android. 525 /* 526 /** @see #getAddress(Object, long) * / 527 @ForceInline 528 public long getAddress(long address) { 529 return getAddress(null, address); 530 } 531 532 /** @see #putAddress(Object, long, long) * / 533 @ForceInline 534 public void putAddress(long address, long x) { 535 putAddress(null, address, x); 536 } 537 */ 538 // END Android-removed: Not used in Android. 539 540 /// helper methods for validating various types of objects/values 541 542 /** 543 * Create an exception reflecting that some of the input was invalid 544 * 545 * <em>Note:</em> It is the responsibility of the caller to make 546 * sure arguments are checked before the methods are called. While 547 * some rudimentary checks are performed on the input, the checks 548 * are best effort and when performance is an overriding priority, 549 * as when methods of this class are optimized by the runtime 550 * compiler, some or all checks (if any) may be elided. Hence, the 551 * caller must not rely on the checks and corresponding 552 * exceptions! 553 * 554 * @return an exception object 555 */ invalidInput()556 private RuntimeException invalidInput() { 557 return new IllegalArgumentException(); 558 } 559 560 /** 561 * Check if a value is 32-bit clean (32 MSB are all zero) 562 * 563 * @param value the 64-bit value to check 564 * 565 * @return true if the value is 32-bit clean 566 */ is32BitClean(long value)567 private boolean is32BitClean(long value) { 568 return value >>> 32 == 0; 569 } 570 571 /** 572 * Check the validity of a size (the equivalent of a size_t) 573 * 574 * @throws RuntimeException if the size is invalid 575 * (<em>Note:</em> after optimization, invalid inputs may 576 * go undetected, which will lead to unpredictable 577 * behavior) 578 */ checkSize(long size)579 private void checkSize(long size) { 580 if (ADDRESS_SIZE == 4) { 581 // Note: this will also check for negative sizes 582 if (!is32BitClean(size)) { 583 throw invalidInput(); 584 } 585 } else if (size < 0) { 586 throw invalidInput(); 587 } 588 } 589 590 /** 591 * Check the validity of a native address (the equivalent of void*) 592 * 593 * @throws RuntimeException if the address is invalid 594 * (<em>Note:</em> after optimization, invalid inputs may 595 * go undetected, which will lead to unpredictable 596 * behavior) 597 */ checkNativeAddress(long address)598 private void checkNativeAddress(long address) { 599 if (ADDRESS_SIZE == 4) { 600 // Accept both zero and sign extended pointers. A valid 601 // pointer will, after the +1 below, either have produced 602 // the value 0x0 or 0x1. Masking off the low bit allows 603 // for testing against 0. 604 if ((((address >> 32) + 1) & ~1) != 0) { 605 throw invalidInput(); 606 } 607 } 608 } 609 610 /** 611 * Check the validity of an offset, relative to a base object 612 * 613 * @param o the base object 614 * @param offset the offset to check 615 * 616 * @throws RuntimeException if the size is invalid 617 * (<em>Note:</em> after optimization, invalid inputs may 618 * go undetected, which will lead to unpredictable 619 * behavior) 620 */ checkOffset(Object o, long offset)621 private void checkOffset(Object o, long offset) { 622 if (ADDRESS_SIZE == 4) { 623 // Note: this will also check for negative offsets 624 if (!is32BitClean(offset)) { 625 throw invalidInput(); 626 } 627 } else if (offset < 0) { 628 throw invalidInput(); 629 } 630 } 631 632 /** 633 * Check the validity of a double-register pointer 634 * 635 * Note: This code deliberately does *not* check for NPE for (at 636 * least) three reasons: 637 * 638 * 1) NPE is not just NULL/0 - there is a range of values all 639 * resulting in an NPE, which is not trivial to check for 640 * 641 * 2) It is the responsibility of the callers of Unsafe methods 642 * to verify the input, so throwing an exception here is not really 643 * useful - passing in a NULL pointer is a critical error and the 644 * must not expect an exception to be thrown anyway. 645 * 646 * 3) the actual operations will detect NULL pointers anyway by 647 * means of traps and signals (like SIGSEGV). 648 * 649 * @param o Java heap object, or null 650 * @param offset indication of where the variable resides in a Java heap 651 * object, if any, else a memory address locating the variable 652 * statically 653 * 654 * @throws RuntimeException if the pointer is invalid 655 * (<em>Note:</em> after optimization, invalid inputs may 656 * go undetected, which will lead to unpredictable 657 * behavior) 658 */ checkPointer(Object o, long offset)659 private void checkPointer(Object o, long offset) { 660 if (o == null) { 661 checkNativeAddress(offset); 662 } else { 663 checkOffset(o, offset); 664 } 665 } 666 667 /** 668 * Check if a type is a primitive array type 669 * 670 * @param c the type to check 671 * 672 * @return true if the type is a primitive array type 673 */ checkPrimitiveArray(Class<?> c)674 private void checkPrimitiveArray(Class<?> c) { 675 Class<?> componentType = c.getComponentType(); 676 if (componentType == null || !componentType.isPrimitive()) { 677 throw invalidInput(); 678 } 679 } 680 681 /** 682 * Check that a pointer is a valid primitive array type pointer 683 * 684 * Note: pointers off-heap are considered to be primitive arrays 685 * 686 * @throws RuntimeException if the pointer is invalid 687 * (<em>Note:</em> after optimization, invalid inputs may 688 * go undetected, which will lead to unpredictable 689 * behavior) 690 */ checkPrimitivePointer(Object o, long offset)691 private void checkPrimitivePointer(Object o, long offset) { 692 checkPointer(o, offset); 693 694 if (o != null) { 695 // If on heap, it must be a primitive array 696 checkPrimitiveArray(o.getClass()); 697 } 698 } 699 700 /// wrappers for malloc, realloc, free: 701 702 // BEGIN Android-removed: Not used in Android. 703 /* 704 /** 705 * Round up allocation size to a multiple of HeapWordSize. 706 * / 707 private long alignToHeapWordSize(long bytes) { 708 if (bytes >= 0) { 709 return (bytes + ADDRESS_SIZE - 1) & ~(ADDRESS_SIZE - 1); 710 } else { 711 throw invalidInput(); 712 } 713 } 714 */ 715 // END Android-removed: Not used in Android. 716 717 /** 718 * Allocates a new block of native memory, of the given size in bytes. The 719 * contents of the memory are uninitialized; they will generally be 720 * garbage. The resulting native pointer will never be zero, and will be 721 * aligned for all value types. Dispose of this memory by calling {@link 722 * #freeMemory}, or resize it with {@link #reallocateMemory}. 723 * 724 * <em>Note:</em> It is the responsibility of the caller to make 725 * sure arguments are checked before the methods are called. While 726 * some rudimentary checks are performed on the input, the checks 727 * are best effort and when performance is an overriding priority, 728 * as when methods of this class are optimized by the runtime 729 * compiler, some or all checks (if any) may be elided. Hence, the 730 * caller must not rely on the checks and corresponding 731 * exceptions! 732 * 733 * @throws RuntimeException if the size is negative or too large 734 * for the native size_t type 735 * 736 * @throws OutOfMemoryError if the allocation is refused by the system 737 * 738 * @see #getByte(long) 739 * @see #putByte(long, byte) 740 */ 741 @FastNative allocateMemory(long bytes)742 public native long allocateMemory(long bytes); 743 // BEGIN Android-removed: Not used in Android. 744 /* 745 public long allocateMemory(long bytes) { 746 bytes = alignToHeapWordSize(bytes); 747 748 allocateMemoryChecks(bytes); 749 750 if (bytes == 0) { 751 return 0; 752 } 753 754 long p = allocateMemory0(bytes); 755 if (p == 0) { 756 throw new OutOfMemoryError("Unable to allocate " + bytes + " bytes"); 757 } 758 759 return p; 760 } 761 762 /** 763 * Validate the arguments to allocateMemory 764 * 765 * @throws RuntimeException if the arguments are invalid 766 * (<em>Note:</em> after optimization, invalid inputs may 767 * go undetected, which will lead to unpredictable 768 * behavior) 769 * / 770 private void allocateMemoryChecks(long bytes) { 771 checkSize(bytes); 772 } 773 774 /** 775 * Resizes a new block of native memory, to the given size in bytes. The 776 * contents of the new block past the size of the old block are 777 * uninitialized; they will generally be garbage. The resulting native 778 * pointer will be zero if and only if the requested size is zero. The 779 * resulting native pointer will be aligned for all value types. Dispose 780 * of this memory by calling {@link #freeMemory}, or resize it with {@link 781 * #reallocateMemory}. The address passed to this method may be null, in 782 * which case an allocation will be performed. 783 * 784 * <em>Note:</em> It is the responsibility of the caller to make 785 * sure arguments are checked before the methods are called. While 786 * some rudimentary checks are performed on the input, the checks 787 * are best effort and when performance is an overriding priority, 788 * as when methods of this class are optimized by the runtime 789 * compiler, some or all checks (if any) may be elided. Hence, the 790 * caller must not rely on the checks and corresponding 791 * exceptions! 792 * 793 * @throws RuntimeException if the size is negative or too large 794 * for the native size_t type 795 * 796 * @throws OutOfMemoryError if the allocation is refused by the system 797 * 798 * @see #allocateMemory 799 * / 800 public long reallocateMemory(long address, long bytes) { 801 bytes = alignToHeapWordSize(bytes); 802 803 reallocateMemoryChecks(address, bytes); 804 805 if (bytes == 0) { 806 freeMemory(address); 807 return 0; 808 } 809 810 long p = (address == 0) ? allocateMemory0(bytes) : reallocateMemory0(address, bytes); 811 if (p == 0) { 812 throw new OutOfMemoryError("Unable to allocate " + bytes + " bytes"); 813 } 814 815 return p; 816 } 817 818 /** 819 * Validate the arguments to reallocateMemory 820 * 821 * @throws RuntimeException if the arguments are invalid 822 * (<em>Note:</em> after optimization, invalid inputs may 823 * go undetected, which will lead to unpredictable 824 * behavior) 825 * / 826 private void reallocateMemoryChecks(long address, long bytes) { 827 checkPointer(null, address); 828 checkSize(bytes); 829 } 830 831 /** 832 * Sets all bytes in a given block of memory to a fixed value 833 * (usually zero). 834 * 835 * <p>This method determines a block's base address by means of two parameters, 836 * and so it provides (in effect) a <em>double-register</em> addressing mode, 837 * as discussed in {@link #getInt(Object,long)}. When the object reference is null, 838 * the offset supplies an absolute base address. 839 * 840 * <p>The stores are in coherent (atomic) units of a size determined 841 * by the address and length parameters. If the effective address and 842 * length are all even modulo 8, the stores take place in 'long' units. 843 * If the effective address and length are (resp.) even modulo 4 or 2, 844 * the stores take place in units of 'int' or 'short'. 845 * 846 * <em>Note:</em> It is the responsibility of the caller to make 847 * sure arguments are checked before the methods are called. While 848 * some rudimentary checks are performed on the input, the checks 849 * are best effort and when performance is an overriding priority, 850 * as when methods of this class are optimized by the runtime 851 * compiler, some or all checks (if any) may be elided. Hence, the 852 * caller must not rely on the checks and corresponding 853 * exceptions! 854 * 855 * @throws RuntimeException if any of the arguments is invalid 856 * 857 * @since 1.7 858 * / 859 public void setMemory(Object o, long offset, long bytes, byte value) { 860 setMemoryChecks(o, offset, bytes, value); 861 862 if (bytes == 0) { 863 return; 864 } 865 866 setMemory0(o, offset, bytes, value); 867 } 868 */ 869 // END Android-removed: Not used in Android. 870 871 // BEGIN Android-changed: setMemory implemented as a native call. 872 /** 873 * Fills given memory block with a given value. 874 * 875 * @param address address of the memoory block 876 * @param bytes length of the memory block, in bytes 877 * @param value fills memory with this value 878 */ 879 @FastNative setMemory(long address, long bytes, byte value)880 public native void setMemory(long address, long bytes, byte value); 881 /* 882 /** 883 * Sets all bytes in a given block of memory to a fixed value 884 * (usually zero). This provides a <em>single-register</em> addressing mode, 885 * as discussed in {@link #getInt(Object,long)}. 886 * 887 * <p>Equivalent to {@code setMemory(null, address, bytes, value)}. 888 * / 889 public void setMemory(long address, long bytes, byte value) { 890 setMemory(null, address, bytes, value); 891 } 892 893 /** 894 * Validate the arguments to setMemory 895 * 896 * @throws RuntimeException if the arguments are invalid 897 * (<em>Note:</em> after optimization, invalid inputs may 898 * go undetected, which will lead to unpredictable 899 * behavior) 900 * / 901 private void setMemoryChecks(Object o, long offset, long bytes, byte value) { 902 checkPrimitivePointer(o, offset); 903 checkSize(bytes); 904 } 905 */ 906 // END Android-changed: setMemory implemented as a native call. 907 908 /** 909 * Sets all bytes in a given block of memory to a copy of another 910 * block. 911 * 912 * This method is to be used to copy memory between array objects. The 913 * offsets used should be relative to the value reported by {@link 914 * #arrayBaseOffset}. For example to copy all elements of an integer 915 * array to another: 916 * 917 * <pre> {@code 918 * unsafe.copyMemory(srcArray, Unsafe.ARRAY_INT_BASE_OFFSET, 919 * destArray, Unsafe.ARRAY_INT_BASE_OFFSET, 920 * srcArray.length * 4); 921 * }</pre> 922 * 923 * <em>Note:</em> It is the responsibility of the caller to make 924 * sure arguments are checked before the methods are called. While 925 * some rudimentary checks are performed on the input, the checks 926 * are best effort and when performance is an overriding priority, 927 * as when methods of this class are optimized by the runtime 928 * compiler, some or all checks (if any) may be elided. Hence, the 929 * caller must not rely on the checks and corresponding 930 * exceptions! 931 * 932 * @param srcBase The source array object from which to copy 933 * @param srcOffset The offset within the object from where to copy 934 * @param destBase The destination array object to which to copy 935 * @param destOffset The offset within the object to where to copy 936 * @param bytes The number of bytes to copy 937 * 938 * @throws RuntimeException if any of the arguments is invalid 939 */ copyMemory(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes)940 public void copyMemory(Object srcBase, long srcOffset, 941 Object destBase, long destOffset, 942 long bytes) { 943 copyMemoryChecks(srcBase, srcOffset, destBase, destOffset, bytes); 944 945 if (bytes == 0) { 946 return; 947 } 948 949 copyMemory0(srcBase, srcOffset, destBase, destOffset, bytes); 950 } 951 952 /** 953 * Sets all bytes in a given block of memory to a copy of another block. 954 * 955 * @param srcAddr address of the source memory to be copied from 956 * @param dstAddr address of the destination memory to copy to 957 * @param bytes number of bytes to copy 958 */ copyMemory(long srcAddr, long dstAddr, long bytes)959 public void copyMemory(long srcAddr, long dstAddr, long bytes) { 960 copyMemory(null, srcAddr, null, dstAddr, bytes); 961 } 962 963 /** 964 * Validate the arguments to copyMemory 965 * 966 * @throws RuntimeException if any of the arguments is invalid 967 * (<em>Note:</em> after optimization, invalid inputs may 968 * go undetected, which will lead to unpredictable 969 * behavior) 970 */ copyMemoryChecks(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes)971 private void copyMemoryChecks(Object srcBase, long srcOffset, 972 Object destBase, long destOffset, 973 long bytes) { 974 checkSize(bytes); 975 checkPrimitivePointer(srcBase, srcOffset); 976 checkPrimitivePointer(destBase, destOffset); 977 } 978 979 // BEGIN Android-removed: Not used in Android. 980 /* 981 /** 982 * Copies all elements from one block of memory to another block, 983 * *unconditionally* byte swapping the elements on the fly. 984 * 985 * <p>This method determines each block's base address by means of two parameters, 986 * and so it provides (in effect) a <em>double-register</em> addressing mode, 987 * as discussed in {@link #getInt(Object,long)}. When the object reference is null, 988 * the offset supplies an absolute base address. 989 * 990 * <em>Note:</em> It is the responsibility of the caller to make 991 * sure arguments are checked before the methods are called. While 992 * some rudimentary checks are performed on the input, the checks 993 * are best effort and when performance is an overriding priority, 994 * as when methods of this class are optimized by the runtime 995 * compiler, some or all checks (if any) may be elided. Hence, the 996 * caller must not rely on the checks and corresponding 997 * exceptions! 998 * 999 * @throws RuntimeException if any of the arguments is invalid 1000 * 1001 * @since 9 1002 * / 1003 public void copySwapMemory(Object srcBase, long srcOffset, 1004 Object destBase, long destOffset, 1005 long bytes, long elemSize) { 1006 copySwapMemoryChecks(srcBase, srcOffset, destBase, destOffset, bytes, elemSize); 1007 1008 if (bytes == 0) { 1009 return; 1010 } 1011 1012 copySwapMemory0(srcBase, srcOffset, destBase, destOffset, bytes, elemSize); 1013 } 1014 1015 private void copySwapMemoryChecks(Object srcBase, long srcOffset, 1016 Object destBase, long destOffset, 1017 long bytes, long elemSize) { 1018 checkSize(bytes); 1019 1020 if (elemSize != 2 && elemSize != 4 && elemSize != 8) { 1021 throw invalidInput(); 1022 } 1023 if (bytes % elemSize != 0) { 1024 throw invalidInput(); 1025 } 1026 1027 checkPrimitivePointer(srcBase, srcOffset); 1028 checkPrimitivePointer(destBase, destOffset); 1029 } 1030 1031 /** 1032 * Copies all elements from one block of memory to another block, byte swapping the 1033 * elements on the fly. 1034 * 1035 * This provides a <em>single-register</em> addressing mode, as 1036 * discussed in {@link #getInt(Object,long)}. 1037 * 1038 * Equivalent to {@code copySwapMemory(null, srcAddress, null, destAddress, bytes, elemSize)}. 1039 * / 1040 public void copySwapMemory(long srcAddress, long destAddress, long bytes, long elemSize) { 1041 copySwapMemory(null, srcAddress, null, destAddress, bytes, elemSize); 1042 } 1043 1044 */ 1045 // END Android-removed: Not used in Android. 1046 1047 /** 1048 * Frees previously allocated memory at given address. 1049 * 1050 * <p>This method determines each block's base address by means of two parameters, 1051 * and so it provides (in effect) a <em>double-register</em> addressing mode, 1052 * as discussed in {@link #getInt(Object,long)}. When the object reference is null, 1053 * the offset supplies an absolute base address. 1054 * 1055 * <em>Note:</em> It is the responsibility of the caller to make 1056 * sure arguments are checked before the methods are called. While 1057 * some rudimentary checks are performed on the input, the checks 1058 * are best effort and when performance is an overriding priority, 1059 * as when methods of this class are optimized by the runtime 1060 * compiler, some or all checks (if any) may be elided. Hence, the 1061 * caller must not rely on the checks and corresponding 1062 * exceptions! 1063 * 1064 * @param address address of the freed memory 1065 * 1066 * @throws RuntimeException if any of the arguments is invalid 1067 * 1068 * @since 9 1069 */ 1070 // BEGIN Android-changed: Implemented as a native call. 1071 @FastNative freeMemory(long address)1072 public native void freeMemory(long address); 1073 /* 1074 public void freeMemory(long address) { 1075 freeMemoryChecks(address); 1076 1077 if (address == 0) { 1078 return; 1079 } 1080 1081 freeMemory0(address); 1082 } 1083 */ 1084 // END Android-changed: Implemented as a native call. 1085 1086 // BEGIN Android-removed: Not used in Android. 1087 /* 1088 /** 1089 * Validate the arguments to freeMemory 1090 * 1091 * @throws RuntimeException if the arguments are invalid 1092 * (<em>Note:</em> after optimization, invalid inputs may 1093 * go undetected, which will lead to unpredictable 1094 * behavior) 1095 * / 1096 private void freeMemoryChecks(long address) { 1097 checkPointer(null, address); 1098 } 1099 1100 /** 1101 * Ensure writeback of a specified virtual memory address range 1102 * from cache to physical memory. All bytes in the address range 1103 * are guaranteed to have been written back to physical memory on 1104 * return from this call i.e. subsequently executed store 1105 * instructions are guaranteed not to be visible before the 1106 * writeback is completed. 1107 * 1108 * @param address 1109 * the lowest byte address that must be guaranteed written 1110 * back to memory. bytes at lower addresses may also be 1111 * written back. 1112 * 1113 * @param length 1114 * the length in bytes of the region starting at address 1115 * that must be guaranteed written back to memory. 1116 * 1117 * @throws RuntimeException if memory writeback is not supported 1118 * on the current hardware of if the arguments are invalid. 1119 * (<em>Note:</em> after optimization, invalid inputs may 1120 * go undetected, which will lead to unpredictable 1121 * behavior) 1122 * 1123 * @since 14 1124 * / 1125 1126 public void writebackMemory(long address, long length) { 1127 checkWritebackEnabled(); 1128 checkWritebackMemory(address, length); 1129 1130 // perform any required pre-writeback barrier 1131 writebackPreSync0(); 1132 1133 // write back one cache line at a time 1134 long line = dataCacheLineAlignDown(address); 1135 long end = address + length; 1136 while (line < end) { 1137 writeback0(line); 1138 line += dataCacheLineFlushSize(); 1139 } 1140 1141 // perform any required post-writeback barrier 1142 writebackPostSync0(); 1143 } 1144 1145 /** 1146 * Validate the arguments to writebackMemory 1147 * 1148 * @throws RuntimeException if the arguments are invalid 1149 * (<em>Note:</em> after optimization, invalid inputs may 1150 * go undetected, which will lead to unpredictable 1151 * behavior) 1152 * / 1153 private void checkWritebackMemory(long address, long length) { 1154 checkNativeAddress(address); 1155 checkSize(length); 1156 } 1157 1158 /** 1159 * Validate that the current hardware supports memory writeback. 1160 * (<em>Note:</em> this is a belt and braces check. Clients are 1161 * expected to test whether writeback is enabled by calling 1162 * ({@link isWritebackEnabled #isWritebackEnabled} and avoid 1163 * calling method {@link writeback #writeback} if it is disabled). 1164 * 1165 * 1166 * @throws RuntimeException if memory writeback is not supported 1167 * / 1168 private void checkWritebackEnabled() { 1169 if (!isWritebackEnabled()) { 1170 throw new RuntimeException("writebackMemory not enabled!"); 1171 } 1172 } 1173 1174 /** 1175 * force writeback of an individual cache line. 1176 * 1177 * @param address 1178 * the start address of the cache line to be written back 1179 * / 1180 @IntrinsicCandidate 1181 private native void writeback0(long address); 1182 1183 /** 1184 * Serialize writeback operations relative to preceding memory writes. 1185 * / 1186 @IntrinsicCandidate 1187 private native void writebackPreSync0(); 1188 1189 /** 1190 * Serialize writeback operations relative to following memory writes. 1191 * / 1192 @IntrinsicCandidate 1193 private native void writebackPostSync0(); 1194 */ 1195 // END Android-removed: Not used in Android. 1196 1197 /// random queries 1198 1199 /** 1200 * This constant differs from all results that will ever be returned from 1201 * {@link #staticFieldOffset}, {@link #objectFieldOffset}, 1202 * or {@link #arrayBaseOffset}. 1203 */ 1204 public static final int INVALID_FIELD_OFFSET = -1; 1205 1206 /** 1207 * Gets the raw byte offset from the start of an object's memory to 1208 * the memory used to store the indicated instance field. 1209 * 1210 * @param field non-{@code null}; the field in question, which must be an 1211 * instance field 1212 * @return the offset to the field 1213 */ objectFieldOffset(Field f)1214 public long objectFieldOffset(Field f) { 1215 // BEGIN Android-changed: Implemented differently on Android. 1216 if (Modifier.isStatic(f.getModifiers())) { 1217 throw new IllegalArgumentException("valid for instance fields only"); 1218 } 1219 return f.getOffset(); 1220 /* 1221 if (f == null) { 1222 throw new NullPointerException(); 1223 } 1224 1225 return objectFieldOffset0(f); 1226 */ 1227 // END Android-changed: Implemented differently on Android. 1228 } 1229 1230 /** 1231 * Reports the location of the field with a given name in the storage 1232 * allocation of its class. 1233 * 1234 * @throws NullPointerException if any parameter is {@code null}. 1235 * @throws InternalError if there is no field named {@code name} declared 1236 * in class {@code c}, i.e., if {@code c.getDeclaredField(name)} 1237 * would throw {@code java.lang.NoSuchFieldException}. 1238 * 1239 * @see #objectFieldOffset(Field) 1240 */ objectFieldOffset(Class<?> c, String name)1241 public long objectFieldOffset(Class<?> c, String name) { 1242 if (c == null || name == null) { 1243 throw new NullPointerException(); 1244 } 1245 1246 Field field = null; 1247 Field[] fields = c.getDeclaredFields(); 1248 for (Field f : fields) { 1249 if (f.getName().equals(name)) { 1250 field = f; 1251 break; 1252 } 1253 } 1254 if (field == null) { 1255 throw new InternalError(); 1256 } 1257 return objectFieldOffset(field); 1258 } 1259 1260 /** 1261 * Reports the location of a given static field, in conjunction with {@link 1262 * #staticFieldBase}. 1263 * <p>Do not expect to perform any sort of arithmetic on this offset; 1264 * it is just a cookie which is passed to the unsafe heap memory accessors. 1265 * 1266 * <p>Any given field will always have the same offset, and no two distinct 1267 * fields of the same class will ever have the same offset. 1268 * 1269 * <p>As of 1.4.1, offsets for fields are represented as long values, 1270 * although the Sun JVM does not use the most significant 32 bits. 1271 * It is hard to imagine a JVM technology which needs more than 1272 * a few bits to encode an offset within a non-array object, 1273 * However, for consistency with other methods in this class, 1274 * this method reports its result as a long value. 1275 * @see #getInt(Object, long) 1276 * @hide 1277 */ staticFieldOffset(Field f)1278 public long staticFieldOffset(Field f) { 1279 // BEGIN Android-changed: Implemented differently on Android. 1280 if (!Modifier.isStatic(f.getModifiers())) { 1281 throw new IllegalArgumentException("valid for static fields only"); 1282 } 1283 return f.getOffset(); 1284 /* 1285 if (f == null) { 1286 throw new NullPointerException(); 1287 } 1288 1289 return staticFieldOffset0(f); 1290 */ 1291 // END Android-changed: Implemented differently on Android. 1292 } 1293 1294 /** 1295 * Reports the location of a given static field, in conjunction with {@link 1296 * #staticFieldOffset}. 1297 * <p>Fetch the base "Object", if any, with which static fields of the 1298 * given class can be accessed via methods like {@link #getInt(Object, 1299 * long)}. This value may be null. This value may refer to an object 1300 * which is a "cookie", not guaranteed to be a real Object, and it should 1301 * not be used in any way except as argument to the get and put routines in 1302 * this class. 1303 * 1304 * @hide 1305 */ staticFieldBase(Field f)1306 public Object staticFieldBase(Field f) { 1307 // BEGIN Android-changed: Implemented differently on Android. 1308 if (!Modifier.isStatic(f.getModifiers())) { 1309 throw new IllegalArgumentException("valid for static fields only"); 1310 } 1311 Class c = f.getDeclaringClass(); 1312 return c; 1313 /* 1314 if (f == null) { 1315 throw new NullPointerException(); 1316 } 1317 1318 return staticFieldBase0(f); 1319 */ 1320 // END Android-changed: Implemented differently on Android. 1321 } 1322 1323 /** 1324 * Ensures the given class has been initialized. This is often 1325 * needed in conjunction with obtaining the static field base of a 1326 * class. 1327 */ ensureClassInitialized(Class<?> c)1328 public void ensureClassInitialized(Class<?> c) { 1329 if (c == null) { 1330 throw new NullPointerException(); 1331 } 1332 1333 // Android-changed: Implementation not yet available natively (b/202380950) 1334 // ensureClassInitialized0(c); 1335 try { 1336 Class.forName(c.getName(), true, c.getClassLoader()); 1337 } catch (ClassNotFoundException e) { 1338 // The function doesn't specify that it's throwing ClassNotFoundException, so it needs 1339 // to be caught here. We could rethrow as NoClassDefFoundError, however that is not 1340 // documented for this function and the upstream implementation does not throw an 1341 // exception. 1342 } 1343 } 1344 1345 /** 1346 * Gets the offset from the start of an array object's memory to 1347 * the memory used to store its initial (zeroeth) element. 1348 * 1349 * @param clazz non-{@code null}; class in question; must be an array class 1350 * @return the offset to the initial element 1351 */ arrayBaseOffset(Class clazz)1352 public int arrayBaseOffset(Class clazz) { 1353 Class<?> component = clazz.getComponentType(); 1354 if (component == null) { 1355 throw new IllegalArgumentException("Valid for array classes only: " + clazz); 1356 } 1357 return getArrayBaseOffsetForComponentType(component); 1358 } 1359 1360 /** The value of {@code arrayBaseOffset(boolean[].class)} */ 1361 public static final int ARRAY_BOOLEAN_BASE_OFFSET 1362 = theUnsafe.arrayBaseOffset(boolean[].class); 1363 1364 /** The value of {@code arrayBaseOffset(byte[].class)} */ 1365 public static final int ARRAY_BYTE_BASE_OFFSET 1366 = theUnsafe.arrayBaseOffset(byte[].class); 1367 1368 /** The value of {@code arrayBaseOffset(short[].class)} */ 1369 public static final int ARRAY_SHORT_BASE_OFFSET 1370 = theUnsafe.arrayBaseOffset(short[].class); 1371 1372 /** The value of {@code arrayBaseOffset(char[].class)} */ 1373 public static final int ARRAY_CHAR_BASE_OFFSET 1374 = theUnsafe.arrayBaseOffset(char[].class); 1375 1376 /** The value of {@code arrayBaseOffset(int[].class)} */ 1377 public static final int ARRAY_INT_BASE_OFFSET 1378 = theUnsafe.arrayBaseOffset(int[].class); 1379 1380 /** The value of {@code arrayBaseOffset(long[].class)} */ 1381 public static final int ARRAY_LONG_BASE_OFFSET 1382 = theUnsafe.arrayBaseOffset(long[].class); 1383 1384 /** The value of {@code arrayBaseOffset(float[].class)} */ 1385 public static final int ARRAY_FLOAT_BASE_OFFSET 1386 = theUnsafe.arrayBaseOffset(float[].class); 1387 1388 /** The value of {@code arrayBaseOffset(double[].class)} */ 1389 public static final int ARRAY_DOUBLE_BASE_OFFSET 1390 = theUnsafe.arrayBaseOffset(double[].class); 1391 1392 /** The value of {@code arrayBaseOffset(Object[].class)} */ 1393 public static final int ARRAY_OBJECT_BASE_OFFSET 1394 = theUnsafe.arrayBaseOffset(Object[].class); 1395 1396 /** 1397 * Gets the size of each element of the given array class. 1398 * 1399 * @param clazz non-{@code null}; class in question; must be an array class 1400 * @return > 0; the size of each element of the array 1401 */ arrayIndexScale(Class clazz)1402 public int arrayIndexScale(Class clazz) { 1403 Class<?> component = clazz.getComponentType(); 1404 if (component == null) { 1405 throw new IllegalArgumentException("Valid for array classes only: " + clazz); 1406 } 1407 return getArrayIndexScaleForComponentType(component); 1408 } 1409 1410 /** The value of {@code arrayIndexScale(boolean[].class)} */ 1411 public static final int ARRAY_BOOLEAN_INDEX_SCALE 1412 = theUnsafe.arrayIndexScale(boolean[].class); 1413 1414 /** The value of {@code arrayIndexScale(byte[].class)} */ 1415 public static final int ARRAY_BYTE_INDEX_SCALE 1416 = theUnsafe.arrayIndexScale(byte[].class); 1417 1418 /** The value of {@code arrayIndexScale(short[].class)} */ 1419 public static final int ARRAY_SHORT_INDEX_SCALE 1420 = theUnsafe.arrayIndexScale(short[].class); 1421 1422 /** The value of {@code arrayIndexScale(char[].class)} */ 1423 public static final int ARRAY_CHAR_INDEX_SCALE 1424 = theUnsafe.arrayIndexScale(char[].class); 1425 1426 /** The value of {@code arrayIndexScale(int[].class)} */ 1427 public static final int ARRAY_INT_INDEX_SCALE 1428 = theUnsafe.arrayIndexScale(int[].class); 1429 1430 /** The value of {@code arrayIndexScale(long[].class)} */ 1431 public static final int ARRAY_LONG_INDEX_SCALE 1432 = theUnsafe.arrayIndexScale(long[].class); 1433 1434 /** The value of {@code arrayIndexScale(float[].class)} */ 1435 public static final int ARRAY_FLOAT_INDEX_SCALE 1436 = theUnsafe.arrayIndexScale(float[].class); 1437 1438 /** The value of {@code arrayIndexScale(double[].class)} */ 1439 public static final int ARRAY_DOUBLE_INDEX_SCALE 1440 = theUnsafe.arrayIndexScale(double[].class); 1441 1442 /** The value of {@code arrayIndexScale(Object[].class)} */ 1443 public static final int ARRAY_OBJECT_INDEX_SCALE 1444 = theUnsafe.arrayIndexScale(Object[].class); 1445 1446 /** 1447 * Gets the size of the address value, in bytes. 1448 * 1449 * @return the size of the address, in bytes 1450 */ 1451 @FastNative addressSize()1452 public native int addressSize(); 1453 1454 /** The value of {@code addressSize()} */ 1455 // Android-changed: Use different source for the address size. 1456 // public static final int ADDRESS_SIZE = ADDRESS_SIZE0; 1457 public static final int ADDRESS_SIZE = theUnsafe.addressSize(); 1458 1459 /** 1460 * Gets the size of the memory page, in bytes. 1461 * 1462 * @return the size of the page 1463 */ 1464 // Android-changed: Implemented as native call. 1465 // public int pageSize() { return PAGE_SIZE; } 1466 @FastNative pageSize()1467 public native int pageSize(); 1468 1469 // BEGIN Android-removed: Not used in Android. 1470 /* 1471 /** 1472 * Reports the size in bytes of a data cache line written back by 1473 * the hardware cache line flush operation available to the JVM or 1474 * 0 if data cache line flushing is not enabled. 1475 * / 1476 public int dataCacheLineFlushSize() { return DATA_CACHE_LINE_FLUSH_SIZE; } 1477 1478 /** 1479 * Rounds down address to a data cache line boundary as 1480 * determined by {@link #dataCacheLineFlushSize} 1481 * @return the rounded down address 1482 * / 1483 public long dataCacheLineAlignDown(long address) { 1484 return (address & ~(DATA_CACHE_LINE_FLUSH_SIZE - 1)); 1485 } 1486 1487 /** 1488 * Returns true if data cache line writeback 1489 * / 1490 public static boolean isWritebackEnabled() { return DATA_CACHE_LINE_FLUSH_SIZE != 0; } 1491 1492 /// random trusted operations from JNI: 1493 1494 /** 1495 * Tells the VM to define a class, without security checks. By default, the 1496 * class loader and protection domain come from the caller's class. 1497 * / 1498 public Class<?> defineClass(String name, byte[] b, int off, int len, 1499 ClassLoader loader, 1500 ProtectionDomain protectionDomain) { 1501 if (b == null) { 1502 throw new NullPointerException(); 1503 } 1504 if (len < 0) { 1505 throw new ArrayIndexOutOfBoundsException(); 1506 } 1507 1508 return defineClass0(name, b, off, len, loader, protectionDomain); 1509 } 1510 1511 public native Class<?> defineClass0(String name, byte[] b, int off, int len, 1512 ClassLoader loader, 1513 ProtectionDomain protectionDomain); 1514 1515 /** 1516 * Allocates an instance but does not run any constructor. 1517 * Initializes the class if it has not yet been. 1518 * / 1519 @IntrinsicCandidate 1520 public native Object allocateInstance(Class<?> cls) 1521 throws InstantiationException; 1522 1523 /** 1524 * Allocates an array of a given type, but does not do zeroing. 1525 * <p> 1526 * This method should only be used in the very rare cases where a high-performance code 1527 * overwrites the destination array completely, and compilers cannot assist in zeroing elimination. 1528 * In an overwhelming majority of cases, a normal Java allocation should be used instead. 1529 * <p> 1530 * Users of this method are <b>required</b> to overwrite the initial (garbage) array contents 1531 * before allowing untrusted code, or code in other threads, to observe the reference 1532 * to the newly allocated array. In addition, the publication of the array reference must be 1533 * safe according to the Java Memory Model requirements. 1534 * <p> 1535 * The safest approach to deal with an uninitialized array is to keep the reference to it in local 1536 * variable at least until the initialization is complete, and then publish it <b>once</b>, either 1537 * by writing it to a <em>volatile</em> field, or storing it into a <em>final</em> field in constructor, 1538 * or issuing a {@link #storeFence} before publishing the reference. 1539 * <p> 1540 * @implnote This method can only allocate primitive arrays, to avoid garbage reference 1541 * elements that could break heap integrity. 1542 * 1543 * @param componentType array component type to allocate 1544 * @param length array size to allocate 1545 * @throws IllegalArgumentException if component type is null, or not a primitive class; 1546 * or the length is negative 1547 * / 1548 public Object allocateUninitializedArray(Class<?> componentType, int length) { 1549 if (componentType == null) { 1550 throw new IllegalArgumentException("Component type is null"); 1551 } 1552 if (!componentType.isPrimitive()) { 1553 throw new IllegalArgumentException("Component type is not primitive"); 1554 } 1555 if (length < 0) { 1556 throw new IllegalArgumentException("Negative length"); 1557 } 1558 return allocateUninitializedArray0(componentType, length); 1559 } 1560 */ 1561 // END Android-removed: Not used in Android. 1562 1563 1564 /** 1565 * Allocates an instance of the given class without running the constructor. 1566 * The class' <clinit> will be run, if necessary. 1567 */ 1568 @IntrinsicCandidate allocateInstance(Class<?> cls)1569 public native Object allocateInstance(Class<?> cls); 1570 // Android-changed: No throw specification 1571 // throws InstantiationException; 1572 1573 // BEGIN Android-removed: Not used in Android. 1574 /* 1575 /** 1576 * Allocates an array of a given type, but does not do zeroing. 1577 * <p> 1578 * This method should only be used in the very rare cases where a high-performance code 1579 * overwrites the destination array completely, and compilers cannot assist in zeroing elimination. 1580 * In an overwhelming majority of cases, a normal Java allocation should be used instead. 1581 * <p> 1582 * Users of this method are <b>required</b> to overwrite the initial (garbage) array contents 1583 * before allowing untrusted code, or code in other threads, to observe the reference 1584 * to the newly allocated array. In addition, the publication of the array reference must be 1585 * safe according to the Java Memory Model requirements. 1586 * <p> 1587 * The safest approach to deal with an uninitialized array is to keep the reference to it in local 1588 * variable at least until the initialization is complete, and then publish it <b>once</b>, either 1589 * by writing it to a <em>volatile</em> field, or storing it into a <em>final</em> field in constructor, 1590 * or issuing a {@link #storeFence} before publishing the reference. 1591 * <p> 1592 * @implnote This method can only allocate primitive arrays, to avoid garbage reference 1593 * elements that could break heap integrity. 1594 * 1595 * @param componentType array component type to allocate 1596 * @param length array size to allocate 1597 * @throws IllegalArgumentException if component type is null, or not a primitive class; 1598 * or the length is negative 1599 * / 1600 public Object allocateUninitializedArray(Class<?> componentType, int length) { 1601 if (componentType == null) { 1602 throw new IllegalArgumentException("Component type is null"); 1603 } 1604 if (!componentType.isPrimitive()) { 1605 throw new IllegalArgumentException("Component type is not primitive"); 1606 } 1607 if (length < 0) { 1608 throw new IllegalArgumentException("Negative length"); 1609 } 1610 return allocateUninitializedArray0(componentType, length); 1611 } 1612 1613 @IntrinsicCandidate 1614 private Object allocateUninitializedArray0(Class<?> componentType, int length) { 1615 // These fallbacks provide zeroed arrays, but intrinsic is not required to 1616 // return the zeroed arrays. 1617 if (componentType == byte.class) return new byte[length]; 1618 if (componentType == boolean.class) return new boolean[length]; 1619 if (componentType == short.class) return new short[length]; 1620 if (componentType == char.class) return new char[length]; 1621 if (componentType == int.class) return new int[length]; 1622 if (componentType == float.class) return new float[length]; 1623 if (componentType == long.class) return new long[length]; 1624 if (componentType == double.class) return new double[length]; 1625 return null; 1626 } 1627 1628 /** Throws the exception without telling the verifier. * / 1629 public native void throwException(Throwable ee); 1630 1631 */ 1632 // END Android-removed: Not used in Android. 1633 1634 /** 1635 * Atomically updates Java variable to {@code x} if it is currently 1636 * holding {@code expected}. 1637 * 1638 * <p>This operation has memory semantics of a {@code volatile} read 1639 * and write. Corresponds to C11 atomic_compare_exchange_strong. 1640 * 1641 * @return {@code true} if successful 1642 */ 1643 // Android-added: FastNative annotation. 1644 @FastNative 1645 @IntrinsicCandidate compareAndSetReference(Object o, long offset, Object expected, Object x)1646 public final native boolean compareAndSetReference(Object o, long offset, 1647 Object expected, 1648 Object x); 1649 1650 // BEGIN Android-removed: Not used in Android. 1651 /* 1652 @IntrinsicCandidate 1653 public final native Object compareAndExchangeReference(Object o, long offset, 1654 Object expected, 1655 Object x); 1656 1657 @IntrinsicCandidate 1658 public final Object compareAndExchangeReferenceAcquire(Object o, long offset, 1659 Object expected, 1660 Object x) { 1661 return compareAndExchangeReference(o, offset, expected, x); 1662 } 1663 1664 @IntrinsicCandidate 1665 public final Object compareAndExchangeReferenceRelease(Object o, long offset, 1666 Object expected, 1667 Object x) { 1668 return compareAndExchangeReference(o, offset, expected, x); 1669 } 1670 1671 @IntrinsicCandidate 1672 public final boolean weakCompareAndSetReferencePlain(Object o, long offset, 1673 Object expected, 1674 Object x) { 1675 return compareAndSetReference(o, offset, expected, x); 1676 } 1677 1678 @IntrinsicCandidate 1679 public final boolean weakCompareAndSetReferenceAcquire(Object o, long offset, 1680 Object expected, 1681 Object x) { 1682 return compareAndSetReference(o, offset, expected, x); 1683 } 1684 1685 @IntrinsicCandidate 1686 public final boolean weakCompareAndSetReferenceRelease(Object o, long offset, 1687 Object expected, 1688 Object x) { 1689 return compareAndSetReference(o, offset, expected, x); 1690 } 1691 */ 1692 // END Android-removed: Not used in Android. 1693 1694 @IntrinsicCandidate weakCompareAndSetReference(Object o, long offset, Object expected, Object x)1695 public final boolean weakCompareAndSetReference(Object o, long offset, 1696 Object expected, 1697 Object x) { 1698 return compareAndSetReference(o, offset, expected, x); 1699 } 1700 1701 /** 1702 * Atomically updates Java variable to {@code x} if it is currently 1703 * holding {@code expected}. 1704 * 1705 * <p>This operation has memory semantics of a {@code volatile} read 1706 * and write. Corresponds to C11 atomic_compare_exchange_strong. 1707 * 1708 * @return {@code true} if successful 1709 */ 1710 // Android-added: FastNative annotation. 1711 @FastNative 1712 @IntrinsicCandidate compareAndSetInt(Object o, long offset, int expected, int x)1713 public final native boolean compareAndSetInt(Object o, long offset, 1714 int expected, 1715 int x); 1716 1717 // BEGIN Android-removed: Not used in Android. 1718 /* 1719 @IntrinsicCandidate 1720 public final native int compareAndExchangeInt(Object o, long offset, 1721 int expected, 1722 int x); 1723 1724 @IntrinsicCandidate 1725 public final int compareAndExchangeIntAcquire(Object o, long offset, 1726 int expected, 1727 int x) { 1728 return compareAndExchangeInt(o, offset, expected, x); 1729 } 1730 1731 @IntrinsicCandidate 1732 public final int compareAndExchangeIntRelease(Object o, long offset, 1733 int expected, 1734 int x) { 1735 return compareAndExchangeInt(o, offset, expected, x); 1736 } 1737 1738 @IntrinsicCandidate 1739 public final boolean weakCompareAndSetIntPlain(Object o, long offset, 1740 int expected, 1741 int x) { 1742 return compareAndSetInt(o, offset, expected, x); 1743 } 1744 1745 @IntrinsicCandidate 1746 public final boolean weakCompareAndSetIntAcquire(Object o, long offset, 1747 int expected, 1748 int x) { 1749 return compareAndSetInt(o, offset, expected, x); 1750 } 1751 1752 @IntrinsicCandidate 1753 public final boolean weakCompareAndSetIntRelease(Object o, long offset, 1754 int expected, 1755 int x) { 1756 return compareAndSetInt(o, offset, expected, x); 1757 } 1758 */ 1759 // END Android-removed: Not used in Android. 1760 1761 @IntrinsicCandidate weakCompareAndSetInt(Object o, long offset, int expected, int x)1762 public final boolean weakCompareAndSetInt(Object o, long offset, 1763 int expected, 1764 int x) { 1765 return compareAndSetInt(o, offset, expected, x); 1766 } 1767 1768 // BEGIN Android-removed: Not used in Android. 1769 /* 1770 @IntrinsicCandidate 1771 public final byte compareAndExchangeByte(Object o, long offset, 1772 byte expected, 1773 byte x) { 1774 long wordOffset = offset & ~3; 1775 int shift = (int) (offset & 3) << 3; 1776 if (BIG_ENDIAN) { 1777 shift = 24 - shift; 1778 } 1779 int mask = 0xFF << shift; 1780 int maskedExpected = (expected & 0xFF) << shift; 1781 int maskedX = (x & 0xFF) << shift; 1782 int fullWord; 1783 do { 1784 fullWord = getIntVolatile(o, wordOffset); 1785 if ((fullWord & mask) != maskedExpected) 1786 return (byte) ((fullWord & mask) >> shift); 1787 } while (!weakCompareAndSetInt(o, wordOffset, 1788 fullWord, (fullWord & ~mask) | maskedX)); 1789 return expected; 1790 } 1791 1792 @IntrinsicCandidate 1793 public final boolean compareAndSetByte(Object o, long offset, 1794 byte expected, 1795 byte x) { 1796 return compareAndExchangeByte(o, offset, expected, x) == expected; 1797 } 1798 1799 @IntrinsicCandidate 1800 public final boolean weakCompareAndSetByte(Object o, long offset, 1801 byte expected, 1802 byte x) { 1803 return compareAndSetByte(o, offset, expected, x); 1804 } 1805 1806 @IntrinsicCandidate 1807 public final boolean weakCompareAndSetByteAcquire(Object o, long offset, 1808 byte expected, 1809 byte x) { 1810 return weakCompareAndSetByte(o, offset, expected, x); 1811 } 1812 1813 @IntrinsicCandidate 1814 public final boolean weakCompareAndSetByteRelease(Object o, long offset, 1815 byte expected, 1816 byte x) { 1817 return weakCompareAndSetByte(o, offset, expected, x); 1818 } 1819 1820 @IntrinsicCandidate 1821 public final boolean weakCompareAndSetBytePlain(Object o, long offset, 1822 byte expected, 1823 byte x) { 1824 return weakCompareAndSetByte(o, offset, expected, x); 1825 } 1826 1827 @IntrinsicCandidate 1828 public final byte compareAndExchangeByteAcquire(Object o, long offset, 1829 byte expected, 1830 byte x) { 1831 return compareAndExchangeByte(o, offset, expected, x); 1832 } 1833 1834 @IntrinsicCandidate 1835 public final byte compareAndExchangeByteRelease(Object o, long offset, 1836 byte expected, 1837 byte x) { 1838 return compareAndExchangeByte(o, offset, expected, x); 1839 } 1840 1841 @IntrinsicCandidate 1842 public final short compareAndExchangeShort(Object o, long offset, 1843 short expected, 1844 short x) { 1845 if ((offset & 3) == 3) { 1846 throw new IllegalArgumentException("Update spans the word, not supported"); 1847 } 1848 long wordOffset = offset & ~3; 1849 int shift = (int) (offset & 3) << 3; 1850 if (BIG_ENDIAN) { 1851 shift = 16 - shift; 1852 } 1853 int mask = 0xFFFF << shift; 1854 int maskedExpected = (expected & 0xFFFF) << shift; 1855 int maskedX = (x & 0xFFFF) << shift; 1856 int fullWord; 1857 do { 1858 fullWord = getIntVolatile(o, wordOffset); 1859 if ((fullWord & mask) != maskedExpected) { 1860 return (short) ((fullWord & mask) >> shift); 1861 } 1862 } while (!weakCompareAndSetInt(o, wordOffset, 1863 fullWord, (fullWord & ~mask) | maskedX)); 1864 return expected; 1865 } 1866 1867 @IntrinsicCandidate 1868 public final boolean compareAndSetShort(Object o, long offset, 1869 short expected, 1870 short x) { 1871 return compareAndExchangeShort(o, offset, expected, x) == expected; 1872 } 1873 1874 @IntrinsicCandidate 1875 public final boolean weakCompareAndSetShort(Object o, long offset, 1876 short expected, 1877 short x) { 1878 return compareAndSetShort(o, offset, expected, x); 1879 } 1880 1881 @IntrinsicCandidate 1882 public final boolean weakCompareAndSetShortAcquire(Object o, long offset, 1883 short expected, 1884 short x) { 1885 return weakCompareAndSetShort(o, offset, expected, x); 1886 } 1887 1888 @IntrinsicCandidate 1889 public final boolean weakCompareAndSetShortRelease(Object o, long offset, 1890 short expected, 1891 short x) { 1892 return weakCompareAndSetShort(o, offset, expected, x); 1893 } 1894 1895 @IntrinsicCandidate 1896 public final boolean weakCompareAndSetShortPlain(Object o, long offset, 1897 short expected, 1898 short x) { 1899 return weakCompareAndSetShort(o, offset, expected, x); 1900 } 1901 1902 1903 @IntrinsicCandidate 1904 public final short compareAndExchangeShortAcquire(Object o, long offset, 1905 short expected, 1906 short x) { 1907 return compareAndExchangeShort(o, offset, expected, x); 1908 } 1909 1910 @IntrinsicCandidate 1911 public final short compareAndExchangeShortRelease(Object o, long offset, 1912 short expected, 1913 short x) { 1914 return compareAndExchangeShort(o, offset, expected, x); 1915 } 1916 1917 @ForceInline 1918 private char s2c(short s) { 1919 return (char) s; 1920 } 1921 1922 @ForceInline 1923 private short c2s(char s) { 1924 return (short) s; 1925 } 1926 1927 @ForceInline 1928 public final boolean compareAndSetChar(Object o, long offset, 1929 char expected, 1930 char x) { 1931 return compareAndSetShort(o, offset, c2s(expected), c2s(x)); 1932 } 1933 1934 @ForceInline 1935 public final char compareAndExchangeChar(Object o, long offset, 1936 char expected, 1937 char x) { 1938 return s2c(compareAndExchangeShort(o, offset, c2s(expected), c2s(x))); 1939 } 1940 1941 @ForceInline 1942 public final char compareAndExchangeCharAcquire(Object o, long offset, 1943 char expected, 1944 char x) { 1945 return s2c(compareAndExchangeShortAcquire(o, offset, c2s(expected), c2s(x))); 1946 } 1947 1948 @ForceInline 1949 public final char compareAndExchangeCharRelease(Object o, long offset, 1950 char expected, 1951 char x) { 1952 return s2c(compareAndExchangeShortRelease(o, offset, c2s(expected), c2s(x))); 1953 } 1954 1955 @ForceInline 1956 public final boolean weakCompareAndSetChar(Object o, long offset, 1957 char expected, 1958 char x) { 1959 return weakCompareAndSetShort(o, offset, c2s(expected), c2s(x)); 1960 } 1961 1962 @ForceInline 1963 public final boolean weakCompareAndSetCharAcquire(Object o, long offset, 1964 char expected, 1965 char x) { 1966 return weakCompareAndSetShortAcquire(o, offset, c2s(expected), c2s(x)); 1967 } 1968 1969 @ForceInline 1970 public final boolean weakCompareAndSetCharRelease(Object o, long offset, 1971 char expected, 1972 char x) { 1973 return weakCompareAndSetShortRelease(o, offset, c2s(expected), c2s(x)); 1974 } 1975 1976 @ForceInline 1977 public final boolean weakCompareAndSetCharPlain(Object o, long offset, 1978 char expected, 1979 char x) { 1980 return weakCompareAndSetShortPlain(o, offset, c2s(expected), c2s(x)); 1981 } 1982 1983 /** 1984 * The JVM converts integral values to boolean values using two 1985 * different conventions, byte testing against zero and truncation 1986 * to least-significant bit. 1987 * 1988 * <p>The JNI documents specify that, at least for returning 1989 * values from native methods, a Java boolean value is converted 1990 * to the value-set 0..1 by first truncating to a byte (0..255 or 1991 * maybe -128..127) and then testing against zero. Thus, Java 1992 * booleans in non-Java data structures are by convention 1993 * represented as 8-bit containers containing either zero (for 1994 * false) or any non-zero value (for true). 1995 * 1996 * <p>Java booleans in the heap are also stored in bytes, but are 1997 * strongly normalized to the value-set 0..1 (i.e., they are 1998 * truncated to the least-significant bit). 1999 * 2000 * <p>The main reason for having different conventions for 2001 * conversion is performance: Truncation to the least-significant 2002 * bit can be usually implemented with fewer (machine) 2003 * instructions than byte testing against zero. 2004 * 2005 * <p>A number of Unsafe methods load boolean values from the heap 2006 * as bytes. Unsafe converts those values according to the JNI 2007 * rules (i.e, using the "testing against zero" convention). The 2008 * method {@code byte2bool} implements that conversion. 2009 * 2010 * @param b the byte to be converted to boolean 2011 * @return the result of the conversion 2012 * / 2013 @ForceInline 2014 private boolean byte2bool(byte b) { 2015 return b != 0; 2016 } 2017 2018 /** 2019 * Convert a boolean value to a byte. The return value is strongly 2020 * normalized to the value-set 0..1 (i.e., the value is truncated 2021 * to the least-significant bit). See {@link #byte2bool(byte)} for 2022 * more details on conversion conventions. 2023 * 2024 * @param b the boolean to be converted to byte (and then normalized) 2025 * @return the result of the conversion 2026 * / 2027 @ForceInline 2028 private byte bool2byte(boolean b) { 2029 return b ? (byte)1 : (byte)0; 2030 } 2031 2032 @ForceInline 2033 public final boolean compareAndSetBoolean(Object o, long offset, 2034 boolean expected, 2035 boolean x) { 2036 return compareAndSetByte(o, offset, bool2byte(expected), bool2byte(x)); 2037 } 2038 2039 @ForceInline 2040 public final boolean compareAndExchangeBoolean(Object o, long offset, 2041 boolean expected, 2042 boolean x) { 2043 return byte2bool(compareAndExchangeByte(o, offset, bool2byte(expected), bool2byte(x))); 2044 } 2045 2046 @ForceInline 2047 public final boolean compareAndExchangeBooleanAcquire(Object o, long offset, 2048 boolean expected, 2049 boolean x) { 2050 return byte2bool(compareAndExchangeByteAcquire(o, offset, bool2byte(expected), bool2byte(x))); 2051 } 2052 2053 @ForceInline 2054 public final boolean compareAndExchangeBooleanRelease(Object o, long offset, 2055 boolean expected, 2056 boolean x) { 2057 return byte2bool(compareAndExchangeByteRelease(o, offset, bool2byte(expected), bool2byte(x))); 2058 } 2059 2060 @ForceInline 2061 public final boolean weakCompareAndSetBoolean(Object o, long offset, 2062 boolean expected, 2063 boolean x) { 2064 return weakCompareAndSetByte(o, offset, bool2byte(expected), bool2byte(x)); 2065 } 2066 2067 @ForceInline 2068 public final boolean weakCompareAndSetBooleanAcquire(Object o, long offset, 2069 boolean expected, 2070 boolean x) { 2071 return weakCompareAndSetByteAcquire(o, offset, bool2byte(expected), bool2byte(x)); 2072 } 2073 2074 @ForceInline 2075 public final boolean weakCompareAndSetBooleanRelease(Object o, long offset, 2076 boolean expected, 2077 boolean x) { 2078 return weakCompareAndSetByteRelease(o, offset, bool2byte(expected), bool2byte(x)); 2079 } 2080 2081 @ForceInline 2082 public final boolean weakCompareAndSetBooleanPlain(Object o, long offset, 2083 boolean expected, 2084 boolean x) { 2085 return weakCompareAndSetBytePlain(o, offset, bool2byte(expected), bool2byte(x)); 2086 } 2087 2088 @ForceInline 2089 public final boolean compareAndSetFloat(Object o, long offset, 2090 float expected, 2091 float x) { 2092 return compareAndSetInt(o, offset, 2093 Float.floatToRawIntBits(expected), 2094 Float.floatToRawIntBits(x)); 2095 } 2096 2097 @ForceInline 2098 public final float compareAndExchangeFloat(Object o, long offset, 2099 float expected, 2100 float x) { 2101 int w = compareAndExchangeInt(o, offset, 2102 Float.floatToRawIntBits(expected), 2103 Float.floatToRawIntBits(x)); 2104 return Float.intBitsToFloat(w); 2105 } 2106 2107 @ForceInline 2108 public final float compareAndExchangeFloatAcquire(Object o, long offset, 2109 float expected, 2110 float x) { 2111 int w = compareAndExchangeIntAcquire(o, offset, 2112 Float.floatToRawIntBits(expected), 2113 Float.floatToRawIntBits(x)); 2114 return Float.intBitsToFloat(w); 2115 } 2116 2117 @ForceInline 2118 public final float compareAndExchangeFloatRelease(Object o, long offset, 2119 float expected, 2120 float x) { 2121 int w = compareAndExchangeIntRelease(o, offset, 2122 Float.floatToRawIntBits(expected), 2123 Float.floatToRawIntBits(x)); 2124 return Float.intBitsToFloat(w); 2125 } 2126 2127 @ForceInline 2128 public final boolean weakCompareAndSetFloatPlain(Object o, long offset, 2129 float expected, 2130 float x) { 2131 return weakCompareAndSetIntPlain(o, offset, 2132 Float.floatToRawIntBits(expected), 2133 Float.floatToRawIntBits(x)); 2134 } 2135 2136 @ForceInline 2137 public final boolean weakCompareAndSetFloatAcquire(Object o, long offset, 2138 float expected, 2139 float x) { 2140 return weakCompareAndSetIntAcquire(o, offset, 2141 Float.floatToRawIntBits(expected), 2142 Float.floatToRawIntBits(x)); 2143 } 2144 2145 @ForceInline 2146 public final boolean weakCompareAndSetFloatRelease(Object o, long offset, 2147 float expected, 2148 float x) { 2149 return weakCompareAndSetIntRelease(o, offset, 2150 Float.floatToRawIntBits(expected), 2151 Float.floatToRawIntBits(x)); 2152 } 2153 2154 @ForceInline 2155 public final boolean weakCompareAndSetFloat(Object o, long offset, 2156 float expected, 2157 float x) { 2158 return weakCompareAndSetInt(o, offset, 2159 Float.floatToRawIntBits(expected), 2160 Float.floatToRawIntBits(x)); 2161 } 2162 2163 /** 2164 * Atomically updates Java variable to {@code x} if it is currently 2165 * holding {@code expected}. 2166 * 2167 * <p>This operation has memory semantics of a {@code volatile} read 2168 * and write. Corresponds to C11 atomic_compare_exchange_strong. 2169 * 2170 * @return {@code true} if successful 2171 * / 2172 @ForceInline 2173 public final boolean compareAndSetDouble(Object o, long offset, 2174 double expected, 2175 double x) { 2176 return compareAndSetLong(o, offset, 2177 Double.doubleToRawLongBits(expected), 2178 Double.doubleToRawLongBits(x)); 2179 } 2180 2181 @ForceInline 2182 public final double compareAndExchangeDouble(Object o, long offset, 2183 double expected, 2184 double x) { 2185 long w = compareAndExchangeLong(o, offset, 2186 Double.doubleToRawLongBits(expected), 2187 Double.doubleToRawLongBits(x)); 2188 return Double.longBitsToDouble(w); 2189 } 2190 2191 @ForceInline 2192 public final double compareAndExchangeDoubleAcquire(Object o, long offset, 2193 double expected, 2194 double x) { 2195 long w = compareAndExchangeLongAcquire(o, offset, 2196 Double.doubleToRawLongBits(expected), 2197 Double.doubleToRawLongBits(x)); 2198 return Double.longBitsToDouble(w); 2199 } 2200 2201 @ForceInline 2202 public final double compareAndExchangeDoubleRelease(Object o, long offset, 2203 double expected, 2204 double x) { 2205 long w = compareAndExchangeLongRelease(o, offset, 2206 Double.doubleToRawLongBits(expected), 2207 Double.doubleToRawLongBits(x)); 2208 return Double.longBitsToDouble(w); 2209 } 2210 2211 @ForceInline 2212 public final boolean weakCompareAndSetDoublePlain(Object o, long offset, 2213 double expected, 2214 double x) { 2215 return weakCompareAndSetLongPlain(o, offset, 2216 Double.doubleToRawLongBits(expected), 2217 Double.doubleToRawLongBits(x)); 2218 } 2219 2220 @ForceInline 2221 public final boolean weakCompareAndSetDoubleAcquire(Object o, long offset, 2222 double expected, 2223 double x) { 2224 return weakCompareAndSetLongAcquire(o, offset, 2225 Double.doubleToRawLongBits(expected), 2226 Double.doubleToRawLongBits(x)); 2227 } 2228 2229 @ForceInline 2230 public final boolean weakCompareAndSetDoubleRelease(Object o, long offset, 2231 double expected, 2232 double x) { 2233 return weakCompareAndSetLongRelease(o, offset, 2234 Double.doubleToRawLongBits(expected), 2235 Double.doubleToRawLongBits(x)); 2236 } 2237 2238 @ForceInline 2239 public final boolean weakCompareAndSetDouble(Object o, long offset, 2240 double expected, 2241 double x) { 2242 return weakCompareAndSetLong(o, offset, 2243 Double.doubleToRawLongBits(expected), 2244 Double.doubleToRawLongBits(x)); 2245 } 2246 */ 2247 // END Android-removed: Not used in Android. 2248 2249 /** 2250 * Atomically updates Java variable to {@code x} if it is currently 2251 * holding {@code expected}. 2252 * 2253 * <p>This operation has memory semantics of a {@code volatile} read 2254 * and write. Corresponds to C11 atomic_compare_exchange_strong. 2255 * 2256 * @return {@code true} if successful 2257 */ 2258 // Android-added: FastNative annotation. 2259 @FastNative 2260 @IntrinsicCandidate compareAndSetLong(Object o, long offset, long expected, long x)2261 public final native boolean compareAndSetLong(Object o, long offset, 2262 long expected, 2263 long x); 2264 2265 /** 2266 * @hide 2267 */ 2268 // Android-added: FastNative annotation. 2269 @FastNative 2270 @IntrinsicCandidate compareAndExchangeLong(Object o, long offset, long expected, long x)2271 public final native long compareAndExchangeLong(Object o, long offset, 2272 long expected, 2273 long x); 2274 2275 // BEGIN Android-removed: Not used in Android. 2276 /* 2277 @IntrinsicCandidate 2278 public final long compareAndExchangeLongAcquire(Object o, long offset, 2279 long expected, 2280 long x) { 2281 return compareAndExchangeLong(o, offset, expected, x); 2282 } 2283 2284 @IntrinsicCandidate 2285 public final long compareAndExchangeLongRelease(Object o, long offset, 2286 long expected, 2287 long x) { 2288 return compareAndExchangeLong(o, offset, expected, x); 2289 } 2290 2291 @IntrinsicCandidate 2292 public final boolean weakCompareAndSetLongPlain(Object o, long offset, 2293 long expected, 2294 long x) { 2295 return compareAndSetLong(o, offset, expected, x); 2296 } 2297 2298 @IntrinsicCandidate 2299 public final boolean weakCompareAndSetLongAcquire(Object o, long offset, 2300 long expected, 2301 long x) { 2302 return compareAndSetLong(o, offset, expected, x); 2303 } 2304 2305 @IntrinsicCandidate 2306 public final boolean weakCompareAndSetLongRelease(Object o, long offset, 2307 long expected, 2308 long x) { 2309 return compareAndSetLong(o, offset, expected, x); 2310 } 2311 2312 @IntrinsicCandidate 2313 public final boolean weakCompareAndSetLong(Object o, long offset, 2314 long expected, 2315 long x) { 2316 return compareAndSetLong(o, offset, expected, x); 2317 } 2318 */ 2319 // END Android-removed: Not used in Android. 2320 2321 /** 2322 * Fetches a reference value from a given Java variable, with volatile 2323 * load semantics. Otherwise identical to {@link #getReference(Object, long)} 2324 */ 2325 // Android-added: FastNative annotation. 2326 @FastNative 2327 @IntrinsicCandidate getReferenceVolatile(Object o, long offset)2328 public native Object getReferenceVolatile(Object o, long offset); 2329 2330 /** 2331 * Stores a reference value into a given Java variable, with 2332 * volatile store semantics. Otherwise identical to {@link #putReference(Object, long, Object)} 2333 */ 2334 // Android-added: FastNative annotation. 2335 @FastNative 2336 @IntrinsicCandidate putReferenceVolatile(Object o, long offset, Object x)2337 public native void putReferenceVolatile(Object o, long offset, Object x); 2338 2339 /** 2340 * Gets an {@code int} field from the given object, 2341 * using {@code volatile} semantics. 2342 * 2343 * @param obj non-{@code null}; object containing the field 2344 * @param offset offset to the field within {@code obj} 2345 * @return the retrieved value 2346 */ 2347 // Android-added: FastNative annotation. 2348 @FastNative 2349 @IntrinsicCandidate getIntVolatile(Object obj, long offset)2350 public native int getIntVolatile(Object obj, long offset); 2351 2352 /** 2353 * Stores an {@code int} field into the given object, 2354 * using {@code volatile} semantics. 2355 * 2356 * @param obj non-{@code null}; object containing the field 2357 * @param offset offset to the field within {@code obj} 2358 * @param newValue the value to store 2359 */ 2360 // Android-added: FastNative annotation. 2361 @FastNative 2362 @IntrinsicCandidate putIntVolatile(Object obj, long offset, int newValue)2363 public native void putIntVolatile(Object obj, long offset, int newValue); 2364 2365 /** Volatile version of {@link #getBoolean(Object, long)} */ 2366 // Android-added: FastNative annotation. 2367 @FastNative 2368 @IntrinsicCandidate getBooleanVolatile(Object o, long offset)2369 public native boolean getBooleanVolatile(Object o, long offset); 2370 2371 /** Volatile version of {@link #putBoolean(Object, long, boolean)} */ 2372 // Android-added: FastNative annotation. 2373 @FastNative 2374 @IntrinsicCandidate putBooleanVolatile(Object o, long offset, boolean x)2375 public native void putBooleanVolatile(Object o, long offset, boolean x); 2376 2377 /** Volatile version of {@link #getByte(Object, long)} */ 2378 // Android-added: FastNative annotation. 2379 @FastNative 2380 @IntrinsicCandidate getByteVolatile(Object o, long offset)2381 public native byte getByteVolatile(Object o, long offset); 2382 2383 /** Volatile version of {@link #putByte(Object, long, byte)} */ 2384 // Android-added: FastNative annotation. 2385 @FastNative 2386 @IntrinsicCandidate putByteVolatile(Object o, long offset, byte x)2387 public native void putByteVolatile(Object o, long offset, byte x); 2388 2389 /** Volatile version of {@link #getShort(Object, long)} */ 2390 // Android-added: FastNative annotation. 2391 @FastNative 2392 @IntrinsicCandidate getShortVolatile(Object o, long offset)2393 public native short getShortVolatile(Object o, long offset); 2394 2395 /** Volatile version of {@link #putShort(Object, long, short)} */ 2396 // Android-added: FastNative annotation. 2397 @FastNative 2398 @IntrinsicCandidate putShortVolatile(Object o, long offset, short x)2399 public native void putShortVolatile(Object o, long offset, short x); 2400 2401 /** Volatile version of {@link #getChar(Object, long)} */ 2402 // Android-added: FastNative annotation. 2403 @FastNative 2404 @IntrinsicCandidate getCharVolatile(Object o, long offset)2405 public native char getCharVolatile(Object o, long offset); 2406 2407 /** Volatile version of {@link #putChar(Object, long, char)} */ 2408 // Android-added: FastNative annotation. 2409 @FastNative 2410 @IntrinsicCandidate putCharVolatile(Object o, long offset, char x)2411 public native void putCharVolatile(Object o, long offset, char x); 2412 2413 /** 2414 * Gets a {@code long} field from the given object, 2415 * using {@code volatile} semantics. 2416 * 2417 * @param obj non-{@code null}; object containing the field 2418 * @param offset offset to the field within {@code obj} 2419 * @return the retrieved value 2420 */ 2421 // Android-added: FastNative annotation. 2422 @FastNative 2423 @IntrinsicCandidate getLongVolatile(Object obj, long offset)2424 public native long getLongVolatile(Object obj, long offset); 2425 2426 /** 2427 * Stores a {@code long} field into the given object, 2428 * using {@code volatile} semantics. 2429 * 2430 * @param obj non-{@code null}; object containing the field 2431 * @param offset offset to the field within {@code obj} 2432 * @param newValue the value to store 2433 */ 2434 // Android-added: FastNative annotation. 2435 @FastNative 2436 @IntrinsicCandidate putLongVolatile(Object obj, long offset, long newValue)2437 public native void putLongVolatile(Object obj, long offset, long newValue); 2438 2439 /** Volatile version of {@link #getFloat(Object, long)} */ 2440 // Android-added: FastNative annotation. 2441 @FastNative 2442 @IntrinsicCandidate getFloatVolatile(Object o, long offset)2443 public native float getFloatVolatile(Object o, long offset); 2444 2445 /** Volatile version of {@link #putFloat(Object, long, float)} */ 2446 // Android-added: FastNative annotation. 2447 @FastNative 2448 @IntrinsicCandidate putFloatVolatile(Object o, long offset, float x)2449 public native void putFloatVolatile(Object o, long offset, float x); 2450 2451 /** Volatile version of {@link #getDouble(Object, long)} */ 2452 // Android-added: FastNative annotation. 2453 @FastNative 2454 @IntrinsicCandidate getDoubleVolatile(Object o, long offset)2455 public native double getDoubleVolatile(Object o, long offset); 2456 2457 /** Volatile version of {@link #putDouble(Object, long, double)} */ 2458 // Android-added: FastNative annotation. 2459 @FastNative 2460 @IntrinsicCandidate putDoubleVolatile(Object o, long offset, double x)2461 public native void putDoubleVolatile(Object o, long offset, double x); 2462 2463 /** Acquire version of {@link #getReferenceVolatile(Object, long)} */ 2464 @IntrinsicCandidate getReferenceAcquire(Object o, long offset)2465 public final Object getReferenceAcquire(Object o, long offset) { 2466 return getReferenceVolatile(o, offset); 2467 } 2468 2469 // BEGIN Android-removed: Not used in Android. 2470 /* 2471 /** Acquire version of {@link #getBooleanVolatile(Object, long)} * / 2472 @IntrinsicCandidate 2473 public final boolean getBooleanAcquire(Object o, long offset) { 2474 return getBooleanVolatile(o, offset); 2475 } 2476 2477 /** Acquire version of {@link #getByteVolatile(Object, long)} * / 2478 @IntrinsicCandidate 2479 public final byte getByteAcquire(Object o, long offset) { 2480 return getByteVolatile(o, offset); 2481 } 2482 2483 /** Acquire version of {@link #getShortVolatile(Object, long)} * / 2484 @IntrinsicCandidate 2485 public final short getShortAcquire(Object o, long offset) { 2486 return getShortVolatile(o, offset); 2487 } 2488 2489 /** Acquire version of {@link #getCharVolatile(Object, long)} * / 2490 @IntrinsicCandidate 2491 public final char getCharAcquire(Object o, long offset) { 2492 return getCharVolatile(o, offset); 2493 } 2494 */ 2495 // END Android-removed: Not used in Android. 2496 2497 /** Acquire version of {@link #getIntVolatile(Object, long)} */ 2498 @IntrinsicCandidate getIntAcquire(Object o, long offset)2499 public final int getIntAcquire(Object o, long offset) { 2500 return getIntVolatile(o, offset); 2501 } 2502 2503 // BEGIN Android-removed: Not used in Android. 2504 /* 2505 /** Acquire version of {@link #getFloatVolatile(Object, long)} * / 2506 @IntrinsicCandidate 2507 public final float getFloatAcquire(Object o, long offset) { 2508 return getFloatVolatile(o, offset); 2509 } 2510 */ 2511 // END Android-removed: Not used in Android. 2512 2513 /** Acquire version of {@link #getLongVolatile(Object, long)} */ 2514 @IntrinsicCandidate getLongAcquire(Object o, long offset)2515 public final long getLongAcquire(Object o, long offset) { 2516 return getLongVolatile(o, offset); 2517 } 2518 2519 // BEGIN Android-removed: Not used in Android. 2520 /* 2521 /** Acquire version of {@link #getDoubleVolatile(Object, long)} * / 2522 @IntrinsicCandidate 2523 public final double getDoubleAcquire(Object o, long offset) { 2524 return getDoubleVolatile(o, offset); 2525 } 2526 2527 /* 2528 * Versions of {@link #putReferenceVolatile(Object, long, Object)} 2529 * that do not guarantee immediate visibility of the store to 2530 * other threads. This method is generally only useful if the 2531 * underlying field is a Java volatile (or if an array cell, one 2532 * that is otherwise only accessed using volatile accesses). 2533 * 2534 * Corresponds to C11 atomic_store_explicit(..., memory_order_release). 2535 * / 2536 */ 2537 // END Android-removed: Not used in Android. 2538 2539 /** Release version of {@link #putReferenceVolatile(Object, long, Object)} */ 2540 @IntrinsicCandidate putReferenceRelease(Object o, long offset, Object x)2541 public final void putReferenceRelease(Object o, long offset, Object x) { 2542 putReferenceVolatile(o, offset, x); 2543 } 2544 2545 // BEGIN Android-removed: Not used in Android. 2546 /* 2547 /** Release version of {@link #putBooleanVolatile(Object, long, boolean)} * / 2548 @IntrinsicCandidate 2549 public final void putBooleanRelease(Object o, long offset, boolean x) { 2550 putBooleanVolatile(o, offset, x); 2551 } 2552 2553 /** Release version of {@link #putByteVolatile(Object, long, byte)} * / 2554 @IntrinsicCandidate 2555 public final void putByteRelease(Object o, long offset, byte x) { 2556 putByteVolatile(o, offset, x); 2557 } 2558 2559 /** Release version of {@link #putShortVolatile(Object, long, short)} * / 2560 @IntrinsicCandidate 2561 public final void putShortRelease(Object o, long offset, short x) { 2562 putShortVolatile(o, offset, x); 2563 } 2564 2565 /** Release version of {@link #putCharVolatile(Object, long, char)} * / 2566 @IntrinsicCandidate 2567 public final void putCharRelease(Object o, long offset, char x) { 2568 putCharVolatile(o, offset, x); 2569 } 2570 */ 2571 // END Android-removed: Not used in Android. 2572 2573 /** Release version of {@link #putIntVolatile(Object, long, int)} */ 2574 @IntrinsicCandidate putIntRelease(Object o, long offset, int x)2575 public final void putIntRelease(Object o, long offset, int x) { 2576 putIntVolatile(o, offset, x); 2577 } 2578 2579 // BEGIN Android-removed: Not used in Android. 2580 /* 2581 /** Release version of {@link #putFloatVolatile(Object, long, float)} * / 2582 @IntrinsicCandidate 2583 public final void putFloatRelease(Object o, long offset, float x) { 2584 putFloatVolatile(o, offset, x); 2585 } 2586 */ 2587 // END Android-removed: Not used in Android. 2588 2589 /** Release version of {@link #putLongVolatile(Object, long, long)} */ 2590 @IntrinsicCandidate putLongRelease(Object o, long offset, long x)2591 public final void putLongRelease(Object o, long offset, long x) { 2592 putLongVolatile(o, offset, x); 2593 } 2594 2595 // BEGIN Android-removed: Not used in Android. 2596 /* 2597 /** Release version of {@link #putDoubleVolatile(Object, long, double)} * / 2598 @IntrinsicCandidate 2599 public final void putDoubleRelease(Object o, long offset, double x) { 2600 putDoubleVolatile(o, offset, x); 2601 } 2602 */ 2603 // END Android-removed: Not used in Android. 2604 2605 // ------------------------------ Opaque -------------------------------------- 2606 2607 /** Opaque version of {@link #getReferenceVolatile(Object, long)} */ 2608 @IntrinsicCandidate getReferenceOpaque(Object o, long offset)2609 public final Object getReferenceOpaque(Object o, long offset) { 2610 return getReferenceVolatile(o, offset); 2611 } 2612 2613 // BEGIN Android-removed: Not used in Android. 2614 /* 2615 /** Opaque version of {@link #getBooleanVolatile(Object, long)} * / 2616 @IntrinsicCandidate 2617 public final boolean getBooleanOpaque(Object o, long offset) { 2618 return getBooleanVolatile(o, offset); 2619 } 2620 2621 /** Opaque version of {@link #getByteVolatile(Object, long)} * / 2622 @IntrinsicCandidate 2623 public final byte getByteOpaque(Object o, long offset) { 2624 return getByteVolatile(o, offset); 2625 } 2626 2627 /** Opaque version of {@link #getShortVolatile(Object, long)} * / 2628 @IntrinsicCandidate 2629 public final short getShortOpaque(Object o, long offset) { 2630 return getShortVolatile(o, offset); 2631 } 2632 2633 /** Opaque version of {@link #getCharVolatile(Object, long)} * / 2634 @IntrinsicCandidate 2635 public final char getCharOpaque(Object o, long offset) { 2636 return getCharVolatile(o, offset); 2637 } 2638 */ 2639 // END Android-removed: Not used in Android. 2640 2641 /** Opaque version of {@link #getIntVolatile(Object, long)} */ 2642 @IntrinsicCandidate getIntOpaque(Object o, long offset)2643 public final int getIntOpaque(Object o, long offset) { 2644 return getIntVolatile(o, offset); 2645 } 2646 2647 // BEGIN Android-removed: Not used in Android. 2648 /* 2649 /** Opaque version of {@link #getFloatVolatile(Object, long)} * / 2650 @IntrinsicCandidate 2651 public final float getFloatOpaque(Object o, long offset) { 2652 return getFloatVolatile(o, offset); 2653 } 2654 */ 2655 // END Android-removed: Not used in Android. 2656 2657 /** Opaque version of {@link #getLongVolatile(Object, long)} */ 2658 @IntrinsicCandidate getLongOpaque(Object o, long offset)2659 public final long getLongOpaque(Object o, long offset) { 2660 return getLongVolatile(o, offset); 2661 } 2662 2663 // BEGIN Android-removed: Not used in Android. 2664 /* 2665 /** Opaque version of {@link #getDoubleVolatile(Object, long)} * / 2666 @IntrinsicCandidate 2667 public final double getDoubleOpaque(Object o, long offset) { 2668 return getDoubleVolatile(o, offset); 2669 } 2670 */ 2671 // END Android-removed: Not used in Android. 2672 2673 /** Opaque version of {@link #putReferenceVolatile(Object, long, Object)} */ 2674 @IntrinsicCandidate putReferenceOpaque(Object o, long offset, Object x)2675 public final void putReferenceOpaque(Object o, long offset, Object x) { 2676 putReferenceVolatile(o, offset, x); 2677 } 2678 2679 // BEGIN Android-removed: Not used in Android. 2680 /* 2681 /** Opaque version of {@link #putBooleanVolatile(Object, long, boolean)} * / 2682 @IntrinsicCandidate 2683 public final void putBooleanOpaque(Object o, long offset, boolean x) { 2684 putBooleanVolatile(o, offset, x); 2685 } 2686 2687 /** Opaque version of {@link #putByteVolatile(Object, long, byte)} * / 2688 @IntrinsicCandidate 2689 public final void putByteOpaque(Object o, long offset, byte x) { 2690 putByteVolatile(o, offset, x); 2691 } 2692 2693 /** Opaque version of {@link #putShortVolatile(Object, long, short)} * / 2694 @IntrinsicCandidate 2695 public final void putShortOpaque(Object o, long offset, short x) { 2696 putShortVolatile(o, offset, x); 2697 } 2698 2699 /** Opaque version of {@link #putCharVolatile(Object, long, char)} * / 2700 @IntrinsicCandidate 2701 public final void putCharOpaque(Object o, long offset, char x) { 2702 putCharVolatile(o, offset, x); 2703 } 2704 */ 2705 // END Android-removed: Not used in Android. 2706 2707 /** Opaque version of {@link #putIntVolatile(Object, long, int)} */ 2708 @IntrinsicCandidate putIntOpaque(Object o, long offset, int x)2709 public final void putIntOpaque(Object o, long offset, int x) { 2710 putIntVolatile(o, offset, x); 2711 } 2712 2713 // BEGIN Android-removed: Not used in Android. 2714 /* 2715 /** Opaque version of {@link #putFloatVolatile(Object, long, float)} * / 2716 @IntrinsicCandidate 2717 public final void putFloatOpaque(Object o, long offset, float x) { 2718 putFloatVolatile(o, offset, x); 2719 } 2720 */ 2721 // END Android-removed: Not used in Android. 2722 2723 /** Opaque version of {@link #putLongVolatile(Object, long, long)} */ 2724 @IntrinsicCandidate putLongOpaque(Object o, long offset, long x)2725 public final void putLongOpaque(Object o, long offset, long x) { 2726 putLongVolatile(o, offset, x); 2727 } 2728 2729 // BEGIN Android-removed: Not used in Android. 2730 /* 2731 /** Opaque version of {@link #putDoubleVolatile(Object, long, double)} * / 2732 @IntrinsicCandidate 2733 public final void putDoubleOpaque(Object o, long offset, double x) { 2734 putDoubleVolatile(o, offset, x); 2735 } 2736 */ 2737 // END Android-removed: Not used in Android. 2738 2739 /** 2740 * Unparks the given object, which must be a {@link Thread}. 2741 * 2742 * <p>See {@link java.util.concurrent.locks.LockSupport} for more 2743 * in-depth information of the behavior of this method.</p> 2744 * 2745 * @param obj non-{@code null}; the object to unpark 2746 */ 2747 // Android-added: FastNative annotation. 2748 @FastNative 2749 @IntrinsicCandidate unpark(Object thread)2750 public native void unpark(Object thread); 2751 2752 /** 2753 * Parks the calling thread for the specified amount of time, 2754 * unless the "permit" for the thread is already available (due to 2755 * a previous call to {@link #unpark}. This method may also return 2756 * spuriously (that is, without the thread being told to unpark 2757 * and without the indicated amount of time elapsing). 2758 * 2759 * <p>See {@link java.util.concurrent.locks.LockSupport} for more 2760 * in-depth information of the behavior of this method.</p> 2761 * 2762 * @param absolute whether the given time value is absolute 2763 * milliseconds-since-the-epoch ({@code true}) or relative 2764 * nanoseconds-from-now ({@code false}) 2765 * @param time the (absolute millis or relative nanos) time value 2766 */ 2767 @IntrinsicCandidate park(boolean isAbsolute, long time)2768 public native void park(boolean isAbsolute, long time); 2769 2770 /* 2771 // BEGIN Android-removed: Not used in Android. 2772 /** 2773 * Gets the load average in the system run queue assigned 2774 * to the available processors averaged over various periods of time. 2775 * This method retrieves the given {@code nelem} samples and 2776 * assigns to the elements of the given {@code loadavg} array. 2777 * The system imposes a maximum of 3 samples, representing 2778 * averages over the last 1, 5, and 15 minutes, respectively. 2779 * 2780 * @param loadavg an array of double of size nelems 2781 * @param nelems the number of samples to be retrieved and 2782 * must be 1 to 3. 2783 * 2784 * @return the number of samples actually retrieved; or -1 2785 * if the load average is unobtainable. 2786 * / 2787 public int getLoadAverage(double[] loadavg, int nelems) { 2788 if (nelems < 0 || nelems > 3 || nelems > loadavg.length) { 2789 throw new ArrayIndexOutOfBoundsException(); 2790 } 2791 2792 return getLoadAverage0(loadavg, nelems); 2793 } 2794 */ 2795 // END Android-removed: Not used in Android. 2796 2797 // The following contain CAS-based Java implementations used on 2798 // platforms not supporting native instructions 2799 2800 /** 2801 * Atomically adds the given value to the current value of a field 2802 * or array element within the given object {@code o} 2803 * at the given {@code offset}. 2804 * 2805 * @param o object/array to update the field/element in 2806 * @param offset field/element offset 2807 * @param delta the value to add 2808 * @return the previous value 2809 * @since 1.8 2810 */ 2811 @IntrinsicCandidate getAndAddInt(Object o, long offset, int delta)2812 public final int getAndAddInt(Object o, long offset, int delta) { 2813 int v; 2814 do { 2815 v = getIntVolatile(o, offset); 2816 } while (!weakCompareAndSetInt(o, offset, v, v + delta)); 2817 return v; 2818 } 2819 2820 // BEGIN Android-removed: Not used in Android. 2821 /* 2822 @ForceInline 2823 public final int getAndAddIntRelease(Object o, long offset, int delta) { 2824 int v; 2825 do { 2826 v = getInt(o, offset); 2827 } while (!weakCompareAndSetIntRelease(o, offset, v, v + delta)); 2828 return v; 2829 } 2830 2831 @ForceInline 2832 public final int getAndAddIntAcquire(Object o, long offset, int delta) { 2833 int v; 2834 do { 2835 v = getIntAcquire(o, offset); 2836 } while (!weakCompareAndSetIntAcquire(o, offset, v, v + delta)); 2837 return v; 2838 } 2839 */ 2840 // END Android-removed: Not used in Android. 2841 2842 /** 2843 * Atomically adds the given value to the current value of a field 2844 * or array element within the given object {@code o} 2845 * at the given {@code offset}. 2846 * 2847 * @param o object/array to update the field/element in 2848 * @param offset field/element offset 2849 * @param delta the value to add 2850 * @return the previous value 2851 * @since 1.8 2852 */ 2853 @IntrinsicCandidate getAndAddLong(Object o, long offset, long delta)2854 public final long getAndAddLong(Object o, long offset, long delta) { 2855 long v; 2856 do { 2857 v = getLongVolatile(o, offset); 2858 // Android-changed: weakCompareAndSetLong not available. 2859 // } while (!weakCompareAndSetLong(o, offset, v, v + delta)); 2860 } while (!compareAndSwapLong(o, offset, v, v + delta)); 2861 return v; 2862 } 2863 2864 // BEGIN Android-removed: Not used in Android. 2865 /* 2866 @ForceInline 2867 public final long getAndAddLongRelease(Object o, long offset, long delta) { 2868 long v; 2869 do { 2870 v = getLong(o, offset); 2871 } while (!weakCompareAndSetLongRelease(o, offset, v, v + delta)); 2872 return v; 2873 } 2874 2875 @ForceInline 2876 public final long getAndAddLongAcquire(Object o, long offset, long delta) { 2877 long v; 2878 do { 2879 v = getLongAcquire(o, offset); 2880 } while (!weakCompareAndSetLongAcquire(o, offset, v, v + delta)); 2881 return v; 2882 } 2883 2884 @IntrinsicCandidate 2885 public final byte getAndAddByte(Object o, long offset, byte delta) { 2886 byte v; 2887 do { 2888 v = getByteVolatile(o, offset); 2889 } while (!weakCompareAndSetByte(o, offset, v, (byte) (v + delta))); 2890 return v; 2891 } 2892 2893 @ForceInline 2894 public final byte getAndAddByteRelease(Object o, long offset, byte delta) { 2895 byte v; 2896 do { 2897 v = getByte(o, offset); 2898 } while (!weakCompareAndSetByteRelease(o, offset, v, (byte) (v + delta))); 2899 return v; 2900 } 2901 2902 @ForceInline 2903 public final byte getAndAddByteAcquire(Object o, long offset, byte delta) { 2904 byte v; 2905 do { 2906 v = getByteAcquire(o, offset); 2907 } while (!weakCompareAndSetByteAcquire(o, offset, v, (byte) (v + delta))); 2908 return v; 2909 } 2910 2911 @IntrinsicCandidate 2912 public final short getAndAddShort(Object o, long offset, short delta) { 2913 short v; 2914 do { 2915 v = getShortVolatile(o, offset); 2916 } while (!weakCompareAndSetShort(o, offset, v, (short) (v + delta))); 2917 return v; 2918 } 2919 2920 @ForceInline 2921 public final short getAndAddShortRelease(Object o, long offset, short delta) { 2922 short v; 2923 do { 2924 v = getShort(o, offset); 2925 } while (!weakCompareAndSetShortRelease(o, offset, v, (short) (v + delta))); 2926 return v; 2927 } 2928 2929 @ForceInline 2930 public final short getAndAddShortAcquire(Object o, long offset, short delta) { 2931 short v; 2932 do { 2933 v = getShortAcquire(o, offset); 2934 } while (!weakCompareAndSetShortAcquire(o, offset, v, (short) (v + delta))); 2935 return v; 2936 } 2937 2938 @ForceInline 2939 public final char getAndAddChar(Object o, long offset, char delta) { 2940 return (char) getAndAddShort(o, offset, (short) delta); 2941 } 2942 2943 @ForceInline 2944 public final char getAndAddCharRelease(Object o, long offset, char delta) { 2945 return (char) getAndAddShortRelease(o, offset, (short) delta); 2946 } 2947 2948 @ForceInline 2949 public final char getAndAddCharAcquire(Object o, long offset, char delta) { 2950 return (char) getAndAddShortAcquire(o, offset, (short) delta); 2951 } 2952 2953 @ForceInline 2954 public final float getAndAddFloat(Object o, long offset, float delta) { 2955 int expectedBits; 2956 float v; 2957 do { 2958 // Load and CAS with the raw bits to avoid issues with NaNs and 2959 // possible bit conversion from signaling NaNs to quiet NaNs that 2960 // may result in the loop not terminating. 2961 expectedBits = getIntVolatile(o, offset); 2962 v = Float.intBitsToFloat(expectedBits); 2963 } while (!weakCompareAndSetInt(o, offset, 2964 expectedBits, Float.floatToRawIntBits(v + delta))); 2965 return v; 2966 } 2967 2968 @ForceInline 2969 public final float getAndAddFloatRelease(Object o, long offset, float delta) { 2970 int expectedBits; 2971 float v; 2972 do { 2973 // Load and CAS with the raw bits to avoid issues with NaNs and 2974 // possible bit conversion from signaling NaNs to quiet NaNs that 2975 // may result in the loop not terminating. 2976 expectedBits = getInt(o, offset); 2977 v = Float.intBitsToFloat(expectedBits); 2978 } while (!weakCompareAndSetIntRelease(o, offset, 2979 expectedBits, Float.floatToRawIntBits(v + delta))); 2980 return v; 2981 } 2982 2983 @ForceInline 2984 public final float getAndAddFloatAcquire(Object o, long offset, float delta) { 2985 int expectedBits; 2986 float v; 2987 do { 2988 // Load and CAS with the raw bits to avoid issues with NaNs and 2989 // possible bit conversion from signaling NaNs to quiet NaNs that 2990 // may result in the loop not terminating. 2991 expectedBits = getIntAcquire(o, offset); 2992 v = Float.intBitsToFloat(expectedBits); 2993 } while (!weakCompareAndSetIntAcquire(o, offset, 2994 expectedBits, Float.floatToRawIntBits(v + delta))); 2995 return v; 2996 } 2997 2998 @ForceInline 2999 public final double getAndAddDouble(Object o, long offset, double delta) { 3000 long expectedBits; 3001 double v; 3002 do { 3003 // Load and CAS with the raw bits to avoid issues with NaNs and 3004 // possible bit conversion from signaling NaNs to quiet NaNs that 3005 // may result in the loop not terminating. 3006 expectedBits = getLongVolatile(o, offset); 3007 v = Double.longBitsToDouble(expectedBits); 3008 } while (!weakCompareAndSetLong(o, offset, 3009 expectedBits, Double.doubleToRawLongBits(v + delta))); 3010 return v; 3011 } 3012 3013 @ForceInline 3014 public final double getAndAddDoubleRelease(Object o, long offset, double delta) { 3015 long expectedBits; 3016 double v; 3017 do { 3018 // Load and CAS with the raw bits to avoid issues with NaNs and 3019 // possible bit conversion from signaling NaNs to quiet NaNs that 3020 // may result in the loop not terminating. 3021 expectedBits = getLong(o, offset); 3022 v = Double.longBitsToDouble(expectedBits); 3023 } while (!weakCompareAndSetLongRelease(o, offset, 3024 expectedBits, Double.doubleToRawLongBits(v + delta))); 3025 return v; 3026 } 3027 3028 @ForceInline 3029 public final double getAndAddDoubleAcquire(Object o, long offset, double delta) { 3030 long expectedBits; 3031 double v; 3032 do { 3033 // Load and CAS with the raw bits to avoid issues with NaNs and 3034 // possible bit conversion from signaling NaNs to quiet NaNs that 3035 // may result in the loop not terminating. 3036 expectedBits = getLongAcquire(o, offset); 3037 v = Double.longBitsToDouble(expectedBits); 3038 } while (!weakCompareAndSetLongAcquire(o, offset, 3039 expectedBits, Double.doubleToRawLongBits(v + delta))); 3040 return v; 3041 } 3042 */ 3043 // END Android-removed: Not used in Android. 3044 3045 /** 3046 * Atomically exchanges the given value with the current value of 3047 * a field or array element within the given object {@code o} 3048 * at the given {@code offset}. 3049 * 3050 * @param o object/array to update the field/element in 3051 * @param offset field/element offset 3052 * @param newValue new value 3053 * @return the previous value 3054 * @since 1.8 3055 */ 3056 @IntrinsicCandidate getAndSetInt(Object o, long offset, int newValue)3057 public final int getAndSetInt(Object o, long offset, int newValue) { 3058 int v; 3059 do { 3060 v = getIntVolatile(o, offset); 3061 } while (!weakCompareAndSetInt(o, offset, v, newValue)); 3062 return v; 3063 } 3064 3065 // BEGIN Android-removed: Not used in Android. 3066 /* 3067 @ForceInline 3068 public final int getAndSetIntRelease(Object o, long offset, int newValue) { 3069 int v; 3070 do { 3071 v = getInt(o, offset); 3072 } while (!weakCompareAndSetIntRelease(o, offset, v, newValue)); 3073 return v; 3074 } 3075 3076 @ForceInline 3077 public final int getAndSetIntAcquire(Object o, long offset, int newValue) { 3078 int v; 3079 do { 3080 v = getIntAcquire(o, offset); 3081 } while (!weakCompareAndSetIntAcquire(o, offset, v, newValue)); 3082 return v; 3083 } 3084 */ 3085 // END Android-removed: Not used in Android. 3086 3087 /** 3088 * Atomically exchanges the given value with the current value of 3089 * a field or array element within the given object {@code o} 3090 * at the given {@code offset}. 3091 * 3092 * @param o object/array to update the field/element in 3093 * @param offset field/element offset 3094 * @param newValue new value 3095 * @return the previous value 3096 * @since 1.8 3097 */ 3098 @IntrinsicCandidate getAndSetLong(Object o, long offset, long newValue)3099 public final long getAndSetLong(Object o, long offset, long newValue) { 3100 long v; 3101 do { 3102 v = getLongVolatile(o, offset); 3103 // Android-changed: weakCompareAndSetLongRelease not available. 3104 // } while (!weakCompareAndSetLongRelease(o, offset, v, newValue)); 3105 } while (!compareAndSwapLong(o, offset, v, newValue)); 3106 return v; 3107 } 3108 3109 // BEGIN Android-removed: Not used in Android. 3110 /* 3111 @ForceInline 3112 public final long getAndSetLongRelease(Object o, long offset, long newValue) { 3113 long v; 3114 do { 3115 v = getLong(o, offset); 3116 } while (!weakCompareAndSetLongRelease(o, offset, v, newValue)); 3117 return v; 3118 } 3119 3120 @ForceInline 3121 public final long getAndSetLongAcquire(Object o, long offset, long newValue) { 3122 long v; 3123 do { 3124 v = getLongAcquire(o, offset); 3125 } while (!weakCompareAndSetLongAcquire(o, offset, v, newValue)); 3126 return v; 3127 } 3128 */ 3129 // END Android-removed: Not used in Android. 3130 3131 /** 3132 * Atomically exchanges the given reference value with the current 3133 * reference value of a field or array element within the given 3134 * object {@code o} at the given {@code offset}. 3135 * 3136 * @param o object/array to update the field/element in 3137 * @param offset field/element offset 3138 * @param newValue new value 3139 * @return the previous value 3140 * @since 1.8 3141 */ 3142 @IntrinsicCandidate getAndSetReference(Object o, long offset, Object newValue)3143 public final Object getAndSetReference(Object o, long offset, Object newValue) { 3144 Object v; 3145 do { 3146 v = getReferenceVolatile(o, offset); 3147 } while (!weakCompareAndSetReference(o, offset, v, newValue)); 3148 return v; 3149 } 3150 3151 // BEGIN Android-removed: Not used in Android. 3152 /* 3153 @ForceInline 3154 public final Object getAndSetReferenceRelease(Object o, long offset, Object newValue) { 3155 Object v; 3156 do { 3157 v = getReference(o, offset); 3158 } while (!weakCompareAndSetReferenceRelease(o, offset, v, newValue)); 3159 return v; 3160 } 3161 3162 @ForceInline 3163 public final Object getAndSetReferenceAcquire(Object o, long offset, Object newValue) { 3164 Object v; 3165 do { 3166 v = getReferenceAcquire(o, offset); 3167 } while (!weakCompareAndSetReferenceAcquire(o, offset, v, newValue)); 3168 return v; 3169 } 3170 3171 @IntrinsicCandidate 3172 public final byte getAndSetByte(Object o, long offset, byte newValue) { 3173 byte v; 3174 do { 3175 v = getByteVolatile(o, offset); 3176 } while (!weakCompareAndSetByte(o, offset, v, newValue)); 3177 return v; 3178 } 3179 3180 @ForceInline 3181 public final byte getAndSetByteRelease(Object o, long offset, byte newValue) { 3182 byte v; 3183 do { 3184 v = getByte(o, offset); 3185 } while (!weakCompareAndSetByteRelease(o, offset, v, newValue)); 3186 return v; 3187 } 3188 3189 @ForceInline 3190 public final byte getAndSetByteAcquire(Object o, long offset, byte newValue) { 3191 byte v; 3192 do { 3193 v = getByteAcquire(o, offset); 3194 } while (!weakCompareAndSetByteAcquire(o, offset, v, newValue)); 3195 return v; 3196 } 3197 3198 @ForceInline 3199 public final boolean getAndSetBoolean(Object o, long offset, boolean newValue) { 3200 return byte2bool(getAndSetByte(o, offset, bool2byte(newValue))); 3201 } 3202 3203 @ForceInline 3204 public final boolean getAndSetBooleanRelease(Object o, long offset, boolean newValue) { 3205 return byte2bool(getAndSetByteRelease(o, offset, bool2byte(newValue))); 3206 } 3207 3208 @ForceInline 3209 public final boolean getAndSetBooleanAcquire(Object o, long offset, boolean newValue) { 3210 return byte2bool(getAndSetByteAcquire(o, offset, bool2byte(newValue))); 3211 } 3212 3213 @IntrinsicCandidate 3214 public final short getAndSetShort(Object o, long offset, short newValue) { 3215 short v; 3216 do { 3217 v = getShortVolatile(o, offset); 3218 } while (!weakCompareAndSetShort(o, offset, v, newValue)); 3219 return v; 3220 } 3221 3222 @ForceInline 3223 public final short getAndSetShortRelease(Object o, long offset, short newValue) { 3224 short v; 3225 do { 3226 v = getShort(o, offset); 3227 } while (!weakCompareAndSetShortRelease(o, offset, v, newValue)); 3228 return v; 3229 } 3230 3231 @ForceInline 3232 public final short getAndSetShortAcquire(Object o, long offset, short newValue) { 3233 short v; 3234 do { 3235 v = getShortAcquire(o, offset); 3236 } while (!weakCompareAndSetShortAcquire(o, offset, v, newValue)); 3237 return v; 3238 } 3239 3240 @ForceInline 3241 public final char getAndSetChar(Object o, long offset, char newValue) { 3242 return s2c(getAndSetShort(o, offset, c2s(newValue))); 3243 } 3244 3245 @ForceInline 3246 public final char getAndSetCharRelease(Object o, long offset, char newValue) { 3247 return s2c(getAndSetShortRelease(o, offset, c2s(newValue))); 3248 } 3249 3250 @ForceInline 3251 public final char getAndSetCharAcquire(Object o, long offset, char newValue) { 3252 return s2c(getAndSetShortAcquire(o, offset, c2s(newValue))); 3253 } 3254 3255 @ForceInline 3256 public final float getAndSetFloat(Object o, long offset, float newValue) { 3257 int v = getAndSetInt(o, offset, Float.floatToRawIntBits(newValue)); 3258 return Float.intBitsToFloat(v); 3259 } 3260 3261 @ForceInline 3262 public final float getAndSetFloatRelease(Object o, long offset, float newValue) { 3263 int v = getAndSetIntRelease(o, offset, Float.floatToRawIntBits(newValue)); 3264 return Float.intBitsToFloat(v); 3265 } 3266 3267 @ForceInline 3268 public final float getAndSetFloatAcquire(Object o, long offset, float newValue) { 3269 int v = getAndSetIntAcquire(o, offset, Float.floatToRawIntBits(newValue)); 3270 return Float.intBitsToFloat(v); 3271 } 3272 3273 @ForceInline 3274 public final double getAndSetDouble(Object o, long offset, double newValue) { 3275 long v = getAndSetLong(o, offset, Double.doubleToRawLongBits(newValue)); 3276 return Double.longBitsToDouble(v); 3277 } 3278 3279 @ForceInline 3280 public final double getAndSetDoubleRelease(Object o, long offset, double newValue) { 3281 long v = getAndSetLongRelease(o, offset, Double.doubleToRawLongBits(newValue)); 3282 return Double.longBitsToDouble(v); 3283 } 3284 3285 @ForceInline 3286 public final double getAndSetDoubleAcquire(Object o, long offset, double newValue) { 3287 long v = getAndSetLongAcquire(o, offset, Double.doubleToRawLongBits(newValue)); 3288 return Double.longBitsToDouble(v); 3289 } 3290 3291 3292 // The following contain CAS-based Java implementations used on 3293 // platforms not supporting native instructions 3294 3295 @ForceInline 3296 public final boolean getAndBitwiseOrBoolean(Object o, long offset, boolean mask) { 3297 return byte2bool(getAndBitwiseOrByte(o, offset, bool2byte(mask))); 3298 } 3299 3300 @ForceInline 3301 public final boolean getAndBitwiseOrBooleanRelease(Object o, long offset, boolean mask) { 3302 return byte2bool(getAndBitwiseOrByteRelease(o, offset, bool2byte(mask))); 3303 } 3304 3305 @ForceInline 3306 public final boolean getAndBitwiseOrBooleanAcquire(Object o, long offset, boolean mask) { 3307 return byte2bool(getAndBitwiseOrByteAcquire(o, offset, bool2byte(mask))); 3308 } 3309 3310 @ForceInline 3311 public final boolean getAndBitwiseAndBoolean(Object o, long offset, boolean mask) { 3312 return byte2bool(getAndBitwiseAndByte(o, offset, bool2byte(mask))); 3313 } 3314 3315 @ForceInline 3316 public final boolean getAndBitwiseAndBooleanRelease(Object o, long offset, boolean mask) { 3317 return byte2bool(getAndBitwiseAndByteRelease(o, offset, bool2byte(mask))); 3318 } 3319 3320 @ForceInline 3321 public final boolean getAndBitwiseAndBooleanAcquire(Object o, long offset, boolean mask) { 3322 return byte2bool(getAndBitwiseAndByteAcquire(o, offset, bool2byte(mask))); 3323 } 3324 3325 @ForceInline 3326 public final boolean getAndBitwiseXorBoolean(Object o, long offset, boolean mask) { 3327 return byte2bool(getAndBitwiseXorByte(o, offset, bool2byte(mask))); 3328 } 3329 3330 @ForceInline 3331 public final boolean getAndBitwiseXorBooleanRelease(Object o, long offset, boolean mask) { 3332 return byte2bool(getAndBitwiseXorByteRelease(o, offset, bool2byte(mask))); 3333 } 3334 3335 @ForceInline 3336 public final boolean getAndBitwiseXorBooleanAcquire(Object o, long offset, boolean mask) { 3337 return byte2bool(getAndBitwiseXorByteAcquire(o, offset, bool2byte(mask))); 3338 } 3339 3340 3341 @ForceInline 3342 public final byte getAndBitwiseOrByte(Object o, long offset, byte mask) { 3343 byte current; 3344 do { 3345 current = getByteVolatile(o, offset); 3346 } while (!weakCompareAndSetByte(o, offset, 3347 current, (byte) (current | mask))); 3348 return current; 3349 } 3350 3351 @ForceInline 3352 public final byte getAndBitwiseOrByteRelease(Object o, long offset, byte mask) { 3353 byte current; 3354 do { 3355 current = getByte(o, offset); 3356 } while (!weakCompareAndSetByteRelease(o, offset, 3357 current, (byte) (current | mask))); 3358 return current; 3359 } 3360 3361 @ForceInline 3362 public final byte getAndBitwiseOrByteAcquire(Object o, long offset, byte mask) { 3363 byte current; 3364 do { 3365 // Plain read, the value is a hint, the acquire CAS does the work 3366 current = getByte(o, offset); 3367 } while (!weakCompareAndSetByteAcquire(o, offset, 3368 current, (byte) (current | mask))); 3369 return current; 3370 } 3371 3372 @ForceInline 3373 public final byte getAndBitwiseAndByte(Object o, long offset, byte mask) { 3374 byte current; 3375 do { 3376 current = getByteVolatile(o, offset); 3377 } while (!weakCompareAndSetByte(o, offset, 3378 current, (byte) (current & mask))); 3379 return current; 3380 } 3381 3382 @ForceInline 3383 public final byte getAndBitwiseAndByteRelease(Object o, long offset, byte mask) { 3384 byte current; 3385 do { 3386 current = getByte(o, offset); 3387 } while (!weakCompareAndSetByteRelease(o, offset, 3388 current, (byte) (current & mask))); 3389 return current; 3390 } 3391 3392 @ForceInline 3393 public final byte getAndBitwiseAndByteAcquire(Object o, long offset, byte mask) { 3394 byte current; 3395 do { 3396 // Plain read, the value is a hint, the acquire CAS does the work 3397 current = getByte(o, offset); 3398 } while (!weakCompareAndSetByteAcquire(o, offset, 3399 current, (byte) (current & mask))); 3400 return current; 3401 } 3402 3403 @ForceInline 3404 public final byte getAndBitwiseXorByte(Object o, long offset, byte mask) { 3405 byte current; 3406 do { 3407 current = getByteVolatile(o, offset); 3408 } while (!weakCompareAndSetByte(o, offset, 3409 current, (byte) (current ^ mask))); 3410 return current; 3411 } 3412 3413 @ForceInline 3414 public final byte getAndBitwiseXorByteRelease(Object o, long offset, byte mask) { 3415 byte current; 3416 do { 3417 current = getByte(o, offset); 3418 } while (!weakCompareAndSetByteRelease(o, offset, 3419 current, (byte) (current ^ mask))); 3420 return current; 3421 } 3422 3423 @ForceInline 3424 public final byte getAndBitwiseXorByteAcquire(Object o, long offset, byte mask) { 3425 byte current; 3426 do { 3427 // Plain read, the value is a hint, the acquire CAS does the work 3428 current = getByte(o, offset); 3429 } while (!weakCompareAndSetByteAcquire(o, offset, 3430 current, (byte) (current ^ mask))); 3431 return current; 3432 } 3433 3434 3435 @ForceInline 3436 public final char getAndBitwiseOrChar(Object o, long offset, char mask) { 3437 return s2c(getAndBitwiseOrShort(o, offset, c2s(mask))); 3438 } 3439 3440 @ForceInline 3441 public final char getAndBitwiseOrCharRelease(Object o, long offset, char mask) { 3442 return s2c(getAndBitwiseOrShortRelease(o, offset, c2s(mask))); 3443 } 3444 3445 @ForceInline 3446 public final char getAndBitwiseOrCharAcquire(Object o, long offset, char mask) { 3447 return s2c(getAndBitwiseOrShortAcquire(o, offset, c2s(mask))); 3448 } 3449 3450 @ForceInline 3451 public final char getAndBitwiseAndChar(Object o, long offset, char mask) { 3452 return s2c(getAndBitwiseAndShort(o, offset, c2s(mask))); 3453 } 3454 3455 @ForceInline 3456 public final char getAndBitwiseAndCharRelease(Object o, long offset, char mask) { 3457 return s2c(getAndBitwiseAndShortRelease(o, offset, c2s(mask))); 3458 } 3459 3460 @ForceInline 3461 public final char getAndBitwiseAndCharAcquire(Object o, long offset, char mask) { 3462 return s2c(getAndBitwiseAndShortAcquire(o, offset, c2s(mask))); 3463 } 3464 3465 @ForceInline 3466 public final char getAndBitwiseXorChar(Object o, long offset, char mask) { 3467 return s2c(getAndBitwiseXorShort(o, offset, c2s(mask))); 3468 } 3469 3470 @ForceInline 3471 public final char getAndBitwiseXorCharRelease(Object o, long offset, char mask) { 3472 return s2c(getAndBitwiseXorShortRelease(o, offset, c2s(mask))); 3473 } 3474 3475 @ForceInline 3476 public final char getAndBitwiseXorCharAcquire(Object o, long offset, char mask) { 3477 return s2c(getAndBitwiseXorShortAcquire(o, offset, c2s(mask))); 3478 } 3479 3480 3481 @ForceInline 3482 public final short getAndBitwiseOrShort(Object o, long offset, short mask) { 3483 short current; 3484 do { 3485 current = getShortVolatile(o, offset); 3486 } while (!weakCompareAndSetShort(o, offset, 3487 current, (short) (current | mask))); 3488 return current; 3489 } 3490 3491 @ForceInline 3492 public final short getAndBitwiseOrShortRelease(Object o, long offset, short mask) { 3493 short current; 3494 do { 3495 current = getShort(o, offset); 3496 } while (!weakCompareAndSetShortRelease(o, offset, 3497 current, (short) (current | mask))); 3498 return current; 3499 } 3500 3501 @ForceInline 3502 public final short getAndBitwiseOrShortAcquire(Object o, long offset, short mask) { 3503 short current; 3504 do { 3505 // Plain read, the value is a hint, the acquire CAS does the work 3506 current = getShort(o, offset); 3507 } while (!weakCompareAndSetShortAcquire(o, offset, 3508 current, (short) (current | mask))); 3509 return current; 3510 } 3511 3512 @ForceInline 3513 public final short getAndBitwiseAndShort(Object o, long offset, short mask) { 3514 short current; 3515 do { 3516 current = getShortVolatile(o, offset); 3517 } while (!weakCompareAndSetShort(o, offset, 3518 current, (short) (current & mask))); 3519 return current; 3520 } 3521 3522 @ForceInline 3523 public final short getAndBitwiseAndShortRelease(Object o, long offset, short mask) { 3524 short current; 3525 do { 3526 current = getShort(o, offset); 3527 } while (!weakCompareAndSetShortRelease(o, offset, 3528 current, (short) (current & mask))); 3529 return current; 3530 } 3531 3532 @ForceInline 3533 public final short getAndBitwiseAndShortAcquire(Object o, long offset, short mask) { 3534 short current; 3535 do { 3536 // Plain read, the value is a hint, the acquire CAS does the work 3537 current = getShort(o, offset); 3538 } while (!weakCompareAndSetShortAcquire(o, offset, 3539 current, (short) (current & mask))); 3540 return current; 3541 } 3542 3543 @ForceInline 3544 public final short getAndBitwiseXorShort(Object o, long offset, short mask) { 3545 short current; 3546 do { 3547 current = getShortVolatile(o, offset); 3548 } while (!weakCompareAndSetShort(o, offset, 3549 current, (short) (current ^ mask))); 3550 return current; 3551 } 3552 3553 @ForceInline 3554 public final short getAndBitwiseXorShortRelease(Object o, long offset, short mask) { 3555 short current; 3556 do { 3557 current = getShort(o, offset); 3558 } while (!weakCompareAndSetShortRelease(o, offset, 3559 current, (short) (current ^ mask))); 3560 return current; 3561 } 3562 3563 @ForceInline 3564 public final short getAndBitwiseXorShortAcquire(Object o, long offset, short mask) { 3565 short current; 3566 do { 3567 // Plain read, the value is a hint, the acquire CAS does the work 3568 current = getShort(o, offset); 3569 } while (!weakCompareAndSetShortAcquire(o, offset, 3570 current, (short) (current ^ mask))); 3571 return current; 3572 } 3573 */ 3574 // END Android-removed: Not used in Android. 3575 3576 // Android-removed: @ForceInline is an unsupported attribute. 3577 // @ForceInline getAndBitwiseOrInt(Object o, long offset, int mask)3578 public final int getAndBitwiseOrInt(Object o, long offset, int mask) { 3579 int current; 3580 do { 3581 current = getIntVolatile(o, offset); 3582 } while (!weakCompareAndSetInt(o, offset, 3583 current, current | mask)); 3584 return current; 3585 } 3586 3587 // BEGIN Android-removed: Not used in Android. 3588 /* 3589 @ForceInline 3590 public final int getAndBitwiseOrIntRelease(Object o, long offset, int mask) { 3591 int current; 3592 do { 3593 current = getInt(o, offset); 3594 } while (!weakCompareAndSetIntRelease(o, offset, 3595 current, current | mask)); 3596 return current; 3597 } 3598 3599 @ForceInline 3600 public final int getAndBitwiseOrIntAcquire(Object o, long offset, int mask) { 3601 int current; 3602 do { 3603 // Plain read, the value is a hint, the acquire CAS does the work 3604 current = getInt(o, offset); 3605 } while (!weakCompareAndSetIntAcquire(o, offset, 3606 current, current | mask)); 3607 return current; 3608 } 3609 */ 3610 // END Android-removed: Not used in Android. 3611 3612 /** 3613 * Atomically replaces the current value of a field or array element within 3614 * the given object with the result of bitwise AND between the current value 3615 * and mask. 3616 * 3617 * @param o object/array to update the field/element in 3618 * @param offset field/element offset 3619 * @param mask the mask value 3620 * @return the previous value 3621 * @since 9 3622 */ 3623 // Android-removed: @ForceInline is an unsupported attribute. 3624 // @ForceInline getAndBitwiseAndInt(Object o, long offset, int mask)3625 public final int getAndBitwiseAndInt(Object o, long offset, int mask) { 3626 int current; 3627 do { 3628 current = getIntVolatile(o, offset); 3629 } while (!weakCompareAndSetInt(o, offset, 3630 current, current & mask)); 3631 return current; 3632 } 3633 3634 // BEGIN Android-removed: Not used in Android. 3635 /* 3636 @ForceInline 3637 public final int getAndBitwiseAndIntRelease(Object o, long offset, int mask) { 3638 int current; 3639 do { 3640 current = getInt(o, offset); 3641 } while (!weakCompareAndSetIntRelease(o, offset, 3642 current, current & mask)); 3643 return current; 3644 } 3645 3646 @ForceInline 3647 public final int getAndBitwiseAndIntAcquire(Object o, long offset, int mask) { 3648 int current; 3649 do { 3650 // Plain read, the value is a hint, the acquire CAS does the work 3651 current = getInt(o, offset); 3652 } while (!weakCompareAndSetIntAcquire(o, offset, 3653 current, current & mask)); 3654 return current; 3655 } 3656 */ 3657 // END Android-removed: Not used in Android. 3658 3659 // Android-removed: @ForceInline is an unsupported attribute. 3660 // @ForceInline getAndBitwiseXorInt(Object o, long offset, int mask)3661 public final int getAndBitwiseXorInt(Object o, long offset, int mask) { 3662 int current; 3663 do { 3664 current = getIntVolatile(o, offset); 3665 } while (!weakCompareAndSetInt(o, offset, 3666 current, current ^ mask)); 3667 return current; 3668 } 3669 3670 // BEGIN Android-removed: Not used in Android. 3671 /* 3672 @ForceInline 3673 public final int getAndBitwiseXorIntRelease(Object o, long offset, int mask) { 3674 int current; 3675 do { 3676 current = getInt(o, offset); 3677 } while (!weakCompareAndSetIntRelease(o, offset, 3678 current, current ^ mask)); 3679 return current; 3680 } 3681 3682 @ForceInline 3683 public final int getAndBitwiseXorIntAcquire(Object o, long offset, int mask) { 3684 int current; 3685 do { 3686 // Plain read, the value is a hint, the acquire CAS does the work 3687 current = getInt(o, offset); 3688 } while (!weakCompareAndSetIntAcquire(o, offset, 3689 current, current ^ mask)); 3690 return current; 3691 } 3692 3693 3694 @ForceInline 3695 public final long getAndBitwiseOrLong(Object o, long offset, long mask) { 3696 long current; 3697 do { 3698 current = getLongVolatile(o, offset); 3699 } while (!weakCompareAndSetLong(o, offset, 3700 current, current | mask)); 3701 return current; 3702 } 3703 3704 @ForceInline 3705 public final long getAndBitwiseOrLongRelease(Object o, long offset, long mask) { 3706 long current; 3707 do { 3708 current = getLong(o, offset); 3709 } while (!weakCompareAndSetLongRelease(o, offset, 3710 current, current | mask)); 3711 return current; 3712 } 3713 3714 @ForceInline 3715 public final long getAndBitwiseOrLongAcquire(Object o, long offset, long mask) { 3716 long current; 3717 do { 3718 // Plain read, the value is a hint, the acquire CAS does the work 3719 current = getLong(o, offset); 3720 } while (!weakCompareAndSetLongAcquire(o, offset, 3721 current, current | mask)); 3722 return current; 3723 } 3724 3725 @ForceInline 3726 public final long getAndBitwiseAndLong(Object o, long offset, long mask) { 3727 long current; 3728 do { 3729 current = getLongVolatile(o, offset); 3730 } while (!weakCompareAndSetLong(o, offset, 3731 current, current & mask)); 3732 return current; 3733 } 3734 3735 @ForceInline 3736 public final long getAndBitwiseAndLongRelease(Object o, long offset, long mask) { 3737 long current; 3738 do { 3739 current = getLong(o, offset); 3740 } while (!weakCompareAndSetLongRelease(o, offset, 3741 current, current & mask)); 3742 return current; 3743 } 3744 3745 @ForceInline 3746 public final long getAndBitwiseAndLongAcquire(Object o, long offset, long mask) { 3747 long current; 3748 do { 3749 // Plain read, the value is a hint, the acquire CAS does the work 3750 current = getLong(o, offset); 3751 } while (!weakCompareAndSetLongAcquire(o, offset, 3752 current, current & mask)); 3753 return current; 3754 } 3755 3756 @ForceInline 3757 public final long getAndBitwiseXorLong(Object o, long offset, long mask) { 3758 long current; 3759 do { 3760 current = getLongVolatile(o, offset); 3761 } while (!weakCompareAndSetLong(o, offset, 3762 current, current ^ mask)); 3763 return current; 3764 } 3765 3766 @ForceInline 3767 public final long getAndBitwiseXorLongRelease(Object o, long offset, long mask) { 3768 long current; 3769 do { 3770 current = getLong(o, offset); 3771 } while (!weakCompareAndSetLongRelease(o, offset, 3772 current, current ^ mask)); 3773 return current; 3774 } 3775 3776 @ForceInline 3777 public final long getAndBitwiseXorLongAcquire(Object o, long offset, long mask) { 3778 long current; 3779 do { 3780 // Plain read, the value is a hint, the acquire CAS does the work 3781 current = getLong(o, offset); 3782 } while (!weakCompareAndSetLongAcquire(o, offset, 3783 current, current ^ mask)); 3784 return current; 3785 } 3786 */ 3787 // END Android-removed: Not used in Android. 3788 3789 /** 3790 * Ensures that loads before the fence will not be reordered with loads and 3791 * stores after the fence; a "LoadLoad plus LoadStore barrier". 3792 * 3793 * Corresponds to C11 atomic_thread_fence(memory_order_acquire) 3794 * (an "acquire fence"). 3795 * 3796 * Provides a LoadLoad barrier followed by a LoadStore barrier. 3797 * 3798 * @since 1.8 3799 */ 3800 // Android-added: FastNative annotation. 3801 @FastNative 3802 @IntrinsicCandidate loadFence()3803 public native void loadFence(); 3804 3805 /** 3806 * Ensures that loads and stores before the fence will not be reordered with 3807 * stores after the fence; a "StoreStore plus LoadStore barrier". 3808 * 3809 * Corresponds to C11 atomic_thread_fence(memory_order_release) 3810 * (a "release fence"). 3811 * 3812 * Provides a StoreStore barrier followed by a LoadStore barrier. 3813 * 3814 * 3815 * @since 1.8 3816 */ 3817 // Android-added: FastNative annotation. 3818 @FastNative 3819 @IntrinsicCandidate storeFence()3820 public native void storeFence(); 3821 3822 /** 3823 * Ensures that loads and stores before the fence will not be reordered 3824 * with loads and stores after the fence. Implies the effects of both 3825 * loadFence() and storeFence(), and in addition, the effect of a StoreLoad 3826 * barrier. 3827 * 3828 * Corresponds to C11 atomic_thread_fence(memory_order_seq_cst). 3829 * @since 1.8 3830 */ 3831 // Android-added: FastNative annotation. 3832 @FastNative 3833 @IntrinsicCandidate fullFence()3834 public native void fullFence(); 3835 3836 /** 3837 * Ensures that loads before the fence will not be reordered with 3838 * loads after the fence. 3839 * 3840 * @implNote 3841 * This method is operationally equivalent to {@link #loadFence()}. 3842 * 3843 * @since 9 3844 */ loadLoadFence()3845 public final void loadLoadFence() { 3846 loadFence(); 3847 } 3848 3849 /** 3850 * Ensures that stores before the fence will not be reordered with 3851 * stores after the fence. 3852 * 3853 * @implNote 3854 * This method is operationally equivalent to {@link #storeFence()}. 3855 * 3856 * @since 9 3857 */ storeStoreFence()3858 public final void storeStoreFence() { 3859 storeFence(); 3860 } 3861 3862 3863 // BEGIN Android-removed: Not used in Android. 3864 /* 3865 /** 3866 * Throws IllegalAccessError; for use by the VM for access control 3867 * error support. 3868 * @since 1.8 3869 * / 3870 private static void throwIllegalAccessError() { 3871 throw new IllegalAccessError(); 3872 } 3873 3874 /** 3875 * Throws NoSuchMethodError; for use by the VM for redefinition support. 3876 * @since 13 3877 * / 3878 private static void throwNoSuchMethodError() { 3879 throw new NoSuchMethodError(); 3880 } 3881 3882 /** 3883 * @return Returns true if the native byte ordering of this 3884 * platform is big-endian, false if it is little-endian. 3885 * / 3886 public final boolean isBigEndian() { return BIG_ENDIAN; } 3887 3888 /** 3889 * @return Returns true if this platform is capable of performing 3890 * accesses at addresses which are not aligned for the type of the 3891 * primitive type being accessed, false otherwise. 3892 * / 3893 public final boolean unalignedAccess() { return UNALIGNED_ACCESS; } 3894 */ 3895 // END Android-removed: Not used in Android. 3896 3897 /** 3898 * Fetches a value at some byte offset into a given Java object. 3899 * More specifically, fetches a value within the given object 3900 * <code>o</code> at the given offset, or (if <code>o</code> is 3901 * null) from the memory address whose numerical value is the 3902 * given offset. <p> 3903 * 3904 * The specification of this method is the same as {@link 3905 * #getLong(Object, long)} except that the offset does not need to 3906 * have been obtained from {@link #objectFieldOffset} on the 3907 * {@link java.lang.reflect.Field} of some Java field. The value 3908 * in memory is raw data, and need not correspond to any Java 3909 * variable. Unless <code>o</code> is null, the value accessed 3910 * must be entirely within the allocated object. The endianness 3911 * of the value in memory is the endianness of the native platform. 3912 * 3913 * <p> The read will be atomic with respect to the largest power 3914 * of two that divides the GCD of the offset and the storage size. 3915 * For example, getLongUnaligned will make atomic reads of 2-, 4-, 3916 * or 8-byte storage units if the offset is zero mod 2, 4, or 8, 3917 * respectively. There are no other guarantees of atomicity. 3918 * <p> 3919 * 8-byte atomicity is only guaranteed on platforms on which 3920 * support atomic accesses to longs. 3921 * 3922 * @param o Java heap object in which the value resides, if any, else 3923 * null 3924 * @param offset The offset in bytes from the start of the object 3925 * @return the value fetched from the indicated object 3926 * @throws RuntimeException No defined exceptions are thrown, not even 3927 * {@link NullPointerException} 3928 * @since 9 3929 */ 3930 @IntrinsicCandidate getLongUnaligned(Object o, long offset)3931 public final long getLongUnaligned(Object o, long offset) { 3932 if ((offset & 7) == 0) { 3933 return getLong(o, offset); 3934 } else if ((offset & 3) == 0) { 3935 return makeLong(getInt(o, offset), 3936 getInt(o, offset + 4)); 3937 } else if ((offset & 1) == 0) { 3938 return makeLong(getShort(o, offset), 3939 getShort(o, offset + 2), 3940 getShort(o, offset + 4), 3941 getShort(o, offset + 6)); 3942 } else { 3943 return makeLong(getByte(o, offset), 3944 getByte(o, offset + 1), 3945 getByte(o, offset + 2), 3946 getByte(o, offset + 3), 3947 getByte(o, offset + 4), 3948 getByte(o, offset + 5), 3949 getByte(o, offset + 6), 3950 getByte(o, offset + 7)); 3951 } 3952 } 3953 3954 /** @see #getLongUnaligned(Object, long) */ 3955 @IntrinsicCandidate getIntUnaligned(Object o, long offset)3956 public final int getIntUnaligned(Object o, long offset) { 3957 if ((offset & 3) == 0) { 3958 return getInt(o, offset); 3959 } else if ((offset & 1) == 0) { 3960 return makeInt(getShort(o, offset), 3961 getShort(o, offset + 2)); 3962 } else { 3963 return makeInt(getByte(o, offset), 3964 getByte(o, offset + 1), 3965 getByte(o, offset + 2), 3966 getByte(o, offset + 3)); 3967 } 3968 } 3969 3970 // BEGIN Android-removed: Not used in Android. 3971 /* 3972 /** @see #getLongUnaligned(Object, long, boolean) * / 3973 public final int getIntUnaligned(Object o, long offset, boolean bigEndian) { 3974 return convEndian(bigEndian, getIntUnaligned(o, offset)); 3975 } 3976 3977 /** @see #getLongUnaligned(Object, long) * / 3978 @IntrinsicCandidate 3979 public final short getShortUnaligned(Object o, long offset) { 3980 if ((offset & 1) == 0) { 3981 return getShort(o, offset); 3982 } else { 3983 return makeShort(getByte(o, offset), 3984 getByte(o, offset + 1)); 3985 } 3986 } 3987 /** @see #getLongUnaligned(Object, long, boolean) * / 3988 public final short getShortUnaligned(Object o, long offset, boolean bigEndian) { 3989 return convEndian(bigEndian, getShortUnaligned(o, offset)); 3990 } 3991 3992 /** @see #getLongUnaligned(Object, long) * / 3993 @IntrinsicCandidate 3994 public final char getCharUnaligned(Object o, long offset) { 3995 if ((offset & 1) == 0) { 3996 return getChar(o, offset); 3997 } else { 3998 return (char)makeShort(getByte(o, offset), 3999 getByte(o, offset + 1)); 4000 } 4001 } 4002 4003 /** @see #getLongUnaligned(Object, long, boolean) * / 4004 public final char getCharUnaligned(Object o, long offset, boolean bigEndian) { 4005 return convEndian(bigEndian, getCharUnaligned(o, offset)); 4006 } 4007 4008 /** 4009 * Stores a value at some byte offset into a given Java object. 4010 * <p> 4011 * The specification of this method is the same as {@link 4012 * #getLong(Object, long)} except that the offset does not need to 4013 * have been obtained from {@link #objectFieldOffset} on the 4014 * {@link java.lang.reflect.Field} of some Java field. The value 4015 * in memory is raw data, and need not correspond to any Java 4016 * variable. The endianness of the value in memory is the 4017 * endianness of the native platform. 4018 * <p> 4019 * The write will be atomic with respect to the largest power of 4020 * two that divides the GCD of the offset and the storage size. 4021 * For example, putLongUnaligned will make atomic writes of 2-, 4-, 4022 * or 8-byte storage units if the offset is zero mod 2, 4, or 8, 4023 * respectively. There are no other guarantees of atomicity. 4024 * <p> 4025 * 8-byte atomicity is only guaranteed on platforms on which 4026 * support atomic accesses to longs. 4027 * 4028 * @param o Java heap object in which the value resides, if any, else 4029 * null 4030 * @param offset The offset in bytes from the start of the object 4031 * @param x the value to store 4032 * @throws RuntimeException No defined exceptions are thrown, not even 4033 * {@link NullPointerException} 4034 * @since 9 4035 * / 4036 @IntrinsicCandidate 4037 public final void putLongUnaligned(Object o, long offset, long x) { 4038 if ((offset & 7) == 0) { 4039 putLong(o, offset, x); 4040 } else if ((offset & 3) == 0) { 4041 putLongParts(o, offset, 4042 (int)(x >> 0), 4043 (int)(x >>> 32)); 4044 } else if ((offset & 1) == 0) { 4045 putLongParts(o, offset, 4046 (short)(x >>> 0), 4047 (short)(x >>> 16), 4048 (short)(x >>> 32), 4049 (short)(x >>> 48)); 4050 } else { 4051 putLongParts(o, offset, 4052 (byte)(x >>> 0), 4053 (byte)(x >>> 8), 4054 (byte)(x >>> 16), 4055 (byte)(x >>> 24), 4056 (byte)(x >>> 32), 4057 (byte)(x >>> 40), 4058 (byte)(x >>> 48), 4059 (byte)(x >>> 56)); 4060 } 4061 } 4062 4063 /** 4064 * As {@link #putLongUnaligned(Object, long, long)} but with an additional 4065 * argument which specifies the endianness of the value as stored in memory. 4066 * @param o Java heap object in which the value resides 4067 * @param offset The offset in bytes from the start of the object 4068 * @param x the value to store 4069 * @param bigEndian The endianness of the value 4070 * @throws RuntimeException No defined exceptions are thrown, not even 4071 * {@link NullPointerException} 4072 * @since 9 4073 * / 4074 public final void putLongUnaligned(Object o, long offset, long x, boolean bigEndian) { 4075 putLongUnaligned(o, offset, convEndian(bigEndian, x)); 4076 } 4077 4078 /** @see #putLongUnaligned(Object, long, long) * / 4079 @IntrinsicCandidate 4080 public final void putIntUnaligned(Object o, long offset, int x) { 4081 if ((offset & 3) == 0) { 4082 putInt(o, offset, x); 4083 } else if ((offset & 1) == 0) { 4084 putIntParts(o, offset, 4085 (short)(x >> 0), 4086 (short)(x >>> 16)); 4087 } else { 4088 putIntParts(o, offset, 4089 (byte)(x >>> 0), 4090 (byte)(x >>> 8), 4091 (byte)(x >>> 16), 4092 (byte)(x >>> 24)); 4093 } 4094 } 4095 /** @see #putLongUnaligned(Object, long, long, boolean) * / 4096 public final void putIntUnaligned(Object o, long offset, int x, boolean bigEndian) { 4097 putIntUnaligned(o, offset, convEndian(bigEndian, x)); 4098 } 4099 4100 /** @see #putLongUnaligned(Object, long, long) * / 4101 @IntrinsicCandidate 4102 public final void putShortUnaligned(Object o, long offset, short x) { 4103 if ((offset & 1) == 0) { 4104 putShort(o, offset, x); 4105 } else { 4106 putShortParts(o, offset, 4107 (byte)(x >>> 0), 4108 (byte)(x >>> 8)); 4109 } 4110 } 4111 /** @see #putLongUnaligned(Object, long, long, boolean) * / 4112 public final void putShortUnaligned(Object o, long offset, short x, boolean bigEndian) { 4113 putShortUnaligned(o, offset, convEndian(bigEndian, x)); 4114 } 4115 4116 /** @see #putLongUnaligned(Object, long, long) * / 4117 @IntrinsicCandidate 4118 public final void putCharUnaligned(Object o, long offset, char x) { 4119 putShortUnaligned(o, offset, (short)x); 4120 } 4121 /** @see #putLongUnaligned(Object, long, long, boolean) * / 4122 public final void putCharUnaligned(Object o, long offset, char x, boolean bigEndian) { 4123 putCharUnaligned(o, offset, convEndian(bigEndian, x)); 4124 } 4125 4126 */ 4127 // END Android-removed: Not used in Android. 4128 pickPos(int top, int pos)4129 private static int pickPos(int top, int pos) { return BIG_ENDIAN ? top - pos : pos; } 4130 4131 // These methods construct integers from bytes. The byte ordering 4132 // is the native endianness of this platform. makeLong(byte i0, byte i1, byte i2, byte i3, byte i4, byte i5, byte i6, byte i7)4133 private static long makeLong(byte i0, byte i1, byte i2, byte i3, byte i4, byte i5, byte i6, byte i7) { 4134 return ((toUnsignedLong(i0) << pickPos(56, 0)) 4135 | (toUnsignedLong(i1) << pickPos(56, 8)) 4136 | (toUnsignedLong(i2) << pickPos(56, 16)) 4137 | (toUnsignedLong(i3) << pickPos(56, 24)) 4138 | (toUnsignedLong(i4) << pickPos(56, 32)) 4139 | (toUnsignedLong(i5) << pickPos(56, 40)) 4140 | (toUnsignedLong(i6) << pickPos(56, 48)) 4141 | (toUnsignedLong(i7) << pickPos(56, 56))); 4142 } makeLong(short i0, short i1, short i2, short i3)4143 private static long makeLong(short i0, short i1, short i2, short i3) { 4144 return ((toUnsignedLong(i0) << pickPos(48, 0)) 4145 | (toUnsignedLong(i1) << pickPos(48, 16)) 4146 | (toUnsignedLong(i2) << pickPos(48, 32)) 4147 | (toUnsignedLong(i3) << pickPos(48, 48))); 4148 } makeLong(int i0, int i1)4149 private static long makeLong(int i0, int i1) { 4150 return (toUnsignedLong(i0) << pickPos(32, 0)) 4151 | (toUnsignedLong(i1) << pickPos(32, 32)); 4152 } makeInt(short i0, short i1)4153 private static int makeInt(short i0, short i1) { 4154 return (toUnsignedInt(i0) << pickPos(16, 0)) 4155 | (toUnsignedInt(i1) << pickPos(16, 16)); 4156 } makeInt(byte i0, byte i1, byte i2, byte i3)4157 private static int makeInt(byte i0, byte i1, byte i2, byte i3) { 4158 return ((toUnsignedInt(i0) << pickPos(24, 0)) 4159 | (toUnsignedInt(i1) << pickPos(24, 8)) 4160 | (toUnsignedInt(i2) << pickPos(24, 16)) 4161 | (toUnsignedInt(i3) << pickPos(24, 24))); 4162 } makeShort(byte i0, byte i1)4163 private static short makeShort(byte i0, byte i1) { 4164 return (short)((toUnsignedInt(i0) << pickPos(8, 0)) 4165 | (toUnsignedInt(i1) << pickPos(8, 8))); 4166 } 4167 4168 // BEGIN Android-removed: Not used in Android. 4169 /* 4170 private static byte pick(byte le, byte be) { return BIG_ENDIAN ? be : le; } 4171 private static short pick(short le, short be) { return BIG_ENDIAN ? be : le; } 4172 private static int pick(int le, int be) { return BIG_ENDIAN ? be : le; } 4173 4174 // These methods write integers to memory from smaller parts 4175 // provided by their caller. The ordering in which these parts 4176 // are written is the native endianness of this platform. 4177 private void putLongParts(Object o, long offset, byte i0, byte i1, byte i2, byte i3, byte i4, byte i5, byte i6, byte i7) { 4178 putByte(o, offset + 0, pick(i0, i7)); 4179 putByte(o, offset + 1, pick(i1, i6)); 4180 putByte(o, offset + 2, pick(i2, i5)); 4181 putByte(o, offset + 3, pick(i3, i4)); 4182 putByte(o, offset + 4, pick(i4, i3)); 4183 putByte(o, offset + 5, pick(i5, i2)); 4184 putByte(o, offset + 6, pick(i6, i1)); 4185 putByte(o, offset + 7, pick(i7, i0)); 4186 } 4187 private void putLongParts(Object o, long offset, short i0, short i1, short i2, short i3) { 4188 putShort(o, offset + 0, pick(i0, i3)); 4189 putShort(o, offset + 2, pick(i1, i2)); 4190 putShort(o, offset + 4, pick(i2, i1)); 4191 putShort(o, offset + 6, pick(i3, i0)); 4192 } 4193 private void putLongParts(Object o, long offset, int i0, int i1) { 4194 putInt(o, offset + 0, pick(i0, i1)); 4195 putInt(o, offset + 4, pick(i1, i0)); 4196 } 4197 private void putIntParts(Object o, long offset, short i0, short i1) { 4198 putShort(o, offset + 0, pick(i0, i1)); 4199 putShort(o, offset + 2, pick(i1, i0)); 4200 } 4201 private void putIntParts(Object o, long offset, byte i0, byte i1, byte i2, byte i3) { 4202 putByte(o, offset + 0, pick(i0, i3)); 4203 putByte(o, offset + 1, pick(i1, i2)); 4204 putByte(o, offset + 2, pick(i2, i1)); 4205 putByte(o, offset + 3, pick(i3, i0)); 4206 } 4207 private void putShortParts(Object o, long offset, byte i0, byte i1) { 4208 putByte(o, offset + 0, pick(i0, i1)); 4209 putByte(o, offset + 1, pick(i1, i0)); 4210 } 4211 */ 4212 // END Android-removed: Not used in Android. 4213 4214 // Zero-extend an integer toUnsignedInt(byte n)4215 private static int toUnsignedInt(byte n) { return n & 0xff; } toUnsignedInt(short n)4216 private static int toUnsignedInt(short n) { return n & 0xffff; } toUnsignedLong(byte n)4217 private static long toUnsignedLong(byte n) { return n & 0xffL; } toUnsignedLong(short n)4218 private static long toUnsignedLong(short n) { return n & 0xffffL; } toUnsignedLong(int n)4219 private static long toUnsignedLong(int n) { return n & 0xffffffffL; } 4220 4221 // BEGIN Android-removed: Not used in Android. 4222 /* 4223 // Maybe byte-reverse an integer 4224 private static char convEndian(boolean big, char n) { return big == BIG_ENDIAN ? n : Character.reverseBytes(n); } 4225 private static short convEndian(boolean big, short n) { return big == BIG_ENDIAN ? n : Short.reverseBytes(n) ; } 4226 private static int convEndian(boolean big, int n) { return big == BIG_ENDIAN ? n : Integer.reverseBytes(n) ; } 4227 private static long convEndian(boolean big, long n) { return big == BIG_ENDIAN ? n : Long.reverseBytes(n) ; } 4228 4229 4230 4231 private native long allocateMemory0(long bytes); 4232 private native long reallocateMemory0(long address, long bytes); 4233 private native void freeMemory0(long address); 4234 private native void setMemory0(Object o, long offset, long bytes, byte value); 4235 */ 4236 // END Android-removed: Not used in Android. 4237 4238 // Android-added: FastNative annotation. 4239 @FastNative 4240 @IntrinsicCandidate copyMemory0(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes)4241 private native void copyMemory0(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes); 4242 4243 // BEGIN Android-removed: Not used in Android. 4244 /* 4245 private native void copySwapMemory0(Object srcBase, long srcOffset, Object destBase, long destOffset, long bytes, long elemSize); 4246 private native long objectFieldOffset0(Field f); 4247 private native long objectFieldOffset1(Class<?> c, String name); 4248 private native long staticFieldOffset0(Field f); 4249 private native Object staticFieldBase0(Field f); 4250 private native boolean shouldBeInitialized0(Class<?> c); 4251 private native void ensureClassInitialized0(Class<?> c); 4252 private native int arrayBaseOffset0(Class<?> arrayClass); 4253 private native int arrayIndexScale0(Class<?> arrayClass); 4254 private native int getLoadAverage0(double[] loadavg, int nelems); 4255 4256 4257 /** 4258 * Invokes the given direct byte buffer's cleaner, if any. 4259 * 4260 * @param directBuffer a direct byte buffer 4261 * @throws NullPointerException if {@code directBuffer} is null 4262 * @throws IllegalArgumentException if {@code directBuffer} is non-direct, 4263 * or is a {@link java.nio.Buffer#slice slice}, or is a 4264 * {@link java.nio.Buffer#duplicate duplicate} 4265 * / 4266 public void invokeCleaner(java.nio.ByteBuffer directBuffer) { 4267 if (!directBuffer.isDirect()) 4268 throw new IllegalArgumentException("buffer is non-direct"); 4269 4270 DirectBuffer db = (DirectBuffer) directBuffer; 4271 if (db.attachment() != null) 4272 throw new IllegalArgumentException("duplicate or slice"); 4273 4274 Cleaner cleaner = db.cleaner(); 4275 if (cleaner != null) { 4276 cleaner.clean(); 4277 } 4278 } 4279 */ 4280 // END Android-removed: Not used in Android. 4281 4282 @Deprecated(since="12", forRemoval=true) getObject(Object o, long offset)4283 public final Object getObject(Object o, long offset) { 4284 return getReference(o, offset); 4285 } 4286 @Deprecated(since="12", forRemoval=true) getObjectVolatile(Object o, long offset)4287 public final Object getObjectVolatile(Object o, long offset) { 4288 return getReferenceVolatile(o, offset); 4289 } 4290 @Deprecated(since="12", forRemoval=true) getObjectAcquire(Object o, long offset)4291 public final Object getObjectAcquire(Object o, long offset) { 4292 return getReferenceAcquire(o, offset); 4293 } 4294 4295 @Deprecated(since="12", forRemoval=true) putObject(Object o, long offset, Object x)4296 public final void putObject(Object o, long offset, Object x) { 4297 putReference(o, offset, x); 4298 } 4299 4300 @Deprecated(since="12", forRemoval=true) putObjectVolatile(Object o, long offset, Object x)4301 public final void putObjectVolatile(Object o, long offset, Object x) { 4302 putReferenceVolatile(o, offset, x); 4303 } 4304 @Deprecated(since="12", forRemoval=true) putObjectRelease(Object o, long offset, Object x)4305 public final void putObjectRelease(Object o, long offset, Object x) { 4306 putReferenceRelease(o, offset, x); 4307 } 4308 4309 @Deprecated(since="12", forRemoval=true) getAndSetObject(Object o, long offset, Object newValue)4310 public final Object getAndSetObject(Object o, long offset, Object newValue) { 4311 return getAndSetReference(o, offset, newValue); 4312 } 4313 4314 @Deprecated(since="12", forRemoval=true) compareAndSetObject(Object o, long offset, Object expected, Object x)4315 public final boolean compareAndSetObject(Object o, long offset, Object expected, Object x) { 4316 return compareAndSetReference(o, offset, expected, x); 4317 } 4318 4319 // BEGIN Android-added: Methods added for the Android platform. 4320 @FastNative getArrayBaseOffsetForComponentType(Class component_class)4321 private static native int getArrayBaseOffsetForComponentType(Class component_class); 4322 @FastNative getArrayIndexScaleForComponentType(Class component_class)4323 private static native int getArrayIndexScaleForComponentType(Class component_class); 4324 4325 /** 4326 * Performs a compare-and-set operation on an {@code int} 4327 * field within the given object. 4328 * 4329 * @param obj non-{@code null}; object containing the field 4330 * @param offset offset to the field within {@code obj} 4331 * @param expectedValue expected value of the field 4332 * @param newValue new value to store in the field if the contents are 4333 * as expected 4334 * @return {@code true} if the new value was in fact stored, and 4335 * {@code false} if not 4336 */ 4337 @FastNative compareAndSwapInt(Object obj, long offset, int expectedValue, int newValue)4338 public native boolean compareAndSwapInt(Object obj, long offset, 4339 int expectedValue, int newValue); 4340 4341 /** 4342 * Performs a compare-and-set operation on a {@code long} 4343 * field within the given object. 4344 * 4345 * @param obj non-{@code null}; object containing the field 4346 * @param offset offset to the field within {@code obj} 4347 * @param expectedValue expected value of the field 4348 * @param newValue new value to store in the field if the contents are 4349 * as expected 4350 * @return {@code true} if the new value was in fact stored, and 4351 * {@code false} if not 4352 */ 4353 @FastNative compareAndSwapLong(Object obj, long offset, long expectedValue, long newValue)4354 public native boolean compareAndSwapLong(Object obj, long offset, 4355 long expectedValue, long newValue); 4356 4357 /** 4358 * Performs a compare-and-set operation on an {@code obj} 4359 * field (that is, a reference field) within the given object. 4360 * 4361 * @param obj non-{@code null}; object containing the field 4362 * @param offset offset to the field within {@code obj} 4363 * @param expectedValue expected value of the field 4364 * @param newValue new value to store in the field if the contents are 4365 * as expected 4366 * @return {@code true} if the new value was in fact stored, and 4367 * {@code false} if not 4368 */ 4369 @FastNative compareAndSwapObject(Object obj, long offset, Object expectedValue, Object newValue)4370 public native boolean compareAndSwapObject(Object obj, long offset, 4371 Object expectedValue, Object newValue); 4372 4373 /** 4374 * Lazy set an int field. 4375 * 4376 * @param obj non-{@code null}; object containing the field 4377 * @param offset offset to the field within {@code obj} 4378 * @param newValue the value to store 4379 */ 4380 @FastNative putOrderedInt(Object obj, long offset, int newValue)4381 public native void putOrderedInt(Object obj, long offset, int newValue); 4382 4383 /** 4384 * Lazy set a long field. 4385 * 4386 * @param obj non-{@code null}; object containing the field 4387 * @param offset offset to the field within {@code obj} 4388 * @param newValue the value to store 4389 */ 4390 @FastNative putOrderedLong(Object obj, long offset, long newValue)4391 public native void putOrderedLong(Object obj, long offset, long newValue); 4392 4393 /** 4394 * Lazy set an object field. 4395 * 4396 * @param obj non-{@code null}; object containing the field 4397 * @param offset offset to the field within {@code obj} 4398 * @param newValue the value to store 4399 */ 4400 @FastNative putOrderedObject(Object obj, long offset, Object newValue)4401 public native void putOrderedObject(Object obj, long offset, 4402 Object newValue); 4403 4404 // END Android-added: Methods added for the Android platform. 4405 4406 4407 } 4408