1 /*
2 * Copyright (c) 2000, 2012, 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 java.nio;
27
28 import java.security.AccessController;
29 import sun.misc.Unsafe;
30 import sun.misc.VM;
31
32 /**
33 * Access to bits, native and otherwise.
34 */
35
36 class Bits { // package-private
37
38 private Bits() { }
39
40
41 // -- Swapping --
42
43 static short swap(short x) {
44 return Short.reverseBytes(x);
45 }
46
47 static char swap(char x) {
48 return Character.reverseBytes(x);
49 }
50
51 static int swap(int x) {
52 return Integer.reverseBytes(x);
53 }
54
55 static long swap(long x) {
56 return Long.reverseBytes(x);
57 }
58
59
60 // -- get/put char --
61
62 static private char makeChar(byte b1, byte b0) {
63 return (char)((b1 << 8) | (b0 & 0xff));
64 }
65
66 static char getCharL(ByteBuffer bb, int bi) {
67 return makeChar(bb._get(bi + 1),
68 bb._get(bi ));
69 }
70
71 static char getCharL(long a) {
72 return makeChar(_get(a + 1),
73 _get(a ));
74 }
75
76 static char getCharB(ByteBuffer bb, int bi) {
77 return makeChar(bb._get(bi ),
78 bb._get(bi + 1));
79 }
80
81 static char getCharB(long a) {
82 return makeChar(_get(a ),
83 _get(a + 1));
84 }
85
86 static char getChar(ByteBuffer bb, int bi, boolean bigEndian) {
87 return bigEndian ? getCharB(bb, bi) : getCharL(bb, bi);
88 }
89
90 static char getChar(long a, boolean bigEndian) {
91 return bigEndian ? getCharB(a) : getCharL(a);
92 }
93
94 private static byte char1(char x) { return (byte)(x >> 8); }
95 private static byte char0(char x) { return (byte)(x ); }
96
97 static void putCharL(ByteBuffer bb, int bi, char x) {
98 bb._put(bi , char0(x));
99 bb._put(bi + 1, char1(x));
100 }
101
102 static void putCharL(long a, char x) {
103 _put(a , char0(x));
104 _put(a + 1, char1(x));
105 }
106
107 static void putCharB(ByteBuffer bb, int bi, char x) {
108 bb._put(bi , char1(x));
109 bb._put(bi + 1, char0(x));
110 }
111
112 static void putCharB(long a, char x) {
113 _put(a , char1(x));
114 _put(a + 1, char0(x));
115 }
116
117 static void putChar(ByteBuffer bb, int bi, char x, boolean bigEndian) {
118 if (bigEndian)
119 putCharB(bb, bi, x);
120 else
121 putCharL(bb, bi, x);
122 }
123
124 static void putChar(long a, char x, boolean bigEndian) {
125 if (bigEndian)
126 putCharB(a, x);
127 else
128 putCharL(a, x);
129 }
130
131
132 // -- get/put short --
133
134 static private short makeShort(byte b1, byte b0) {
135 return (short)((b1 << 8) | (b0 & 0xff));
136 }
137
138 static short getShortL(ByteBuffer bb, int bi) {
139 return makeShort(bb._get(bi + 1),
140 bb._get(bi ));
141 }
142
143 static short getShortL(long a) {
144 return makeShort(_get(a + 1),
145 _get(a ));
146 }
147
148 static short getShortB(ByteBuffer bb, int bi) {
149 return makeShort(bb._get(bi ),
150 bb._get(bi + 1));
151 }
152
153 static short getShortB(long a) {
154 return makeShort(_get(a ),
155 _get(a + 1));
156 }
157
158 static short getShort(ByteBuffer bb, int bi, boolean bigEndian) {
159 return bigEndian ? getShortB(bb, bi) : getShortL(bb, bi);
160 }
161
162 static short getShort(long a, boolean bigEndian) {
163 return bigEndian ? getShortB(a) : getShortL(a);
164 }
165
166 private static byte short1(short x) { return (byte)(x >> 8); }
167 private static byte short0(short x) { return (byte)(x ); }
168
169 static void putShortL(ByteBuffer bb, int bi, short x) {
170 bb._put(bi , short0(x));
171 bb._put(bi + 1, short1(x));
172 }
173
174 static void putShortL(long a, short x) {
175 _put(a , short0(x));
176 _put(a + 1, short1(x));
177 }
178
179 static void putShortB(ByteBuffer bb, int bi, short x) {
180 bb._put(bi , short1(x));
181 bb._put(bi + 1, short0(x));
182 }
183
184 static void putShortB(long a, short x) {
185 _put(a , short1(x));
186 _put(a + 1, short0(x));
187 }
188
189 static void putShort(ByteBuffer bb, int bi, short x, boolean bigEndian) {
190 if (bigEndian)
191 putShortB(bb, bi, x);
192 else
193 putShortL(bb, bi, x);
194 }
195
196 static void putShort(long a, short x, boolean bigEndian) {
197 if (bigEndian)
198 putShortB(a, x);
199 else
200 putShortL(a, x);
201 }
202
203
204 // -- get/put int --
205
206 static private int makeInt(byte b3, byte b2, byte b1, byte b0) {
207 return (((b3 ) << 24) |
208 ((b2 & 0xff) << 16) |
209 ((b1 & 0xff) << 8) |
210 ((b0 & 0xff) ));
211 }
212
213 static int getIntL(ByteBuffer bb, int bi) {
214 return makeInt(bb._get(bi + 3),
215 bb._get(bi + 2),
216 bb._get(bi + 1),
217 bb._get(bi ));
218 }
219
220 static int getIntL(long a) {
221 return makeInt(_get(a + 3),
222 _get(a + 2),
223 _get(a + 1),
224 _get(a ));
225 }
226
227 static int getIntB(ByteBuffer bb, int bi) {
228 return makeInt(bb._get(bi ),
229 bb._get(bi + 1),
230 bb._get(bi + 2),
231 bb._get(bi + 3));
232 }
233
234 static int getIntB(long a) {
235 return makeInt(_get(a ),
236 _get(a + 1),
237 _get(a + 2),
238 _get(a + 3));
239 }
240
241 static int getInt(ByteBuffer bb, int bi, boolean bigEndian) {
242 return bigEndian ? getIntB(bb, bi) : getIntL(bb, bi) ;
243 }
244
245 static int getInt(long a, boolean bigEndian) {
246 return bigEndian ? getIntB(a) : getIntL(a) ;
247 }
248
249 private static byte int3(int x) { return (byte)(x >> 24); }
250 private static byte int2(int x) { return (byte)(x >> 16); }
251 private static byte int1(int x) { return (byte)(x >> 8); }
252 private static byte int0(int x) { return (byte)(x ); }
253
254 static void putIntL(ByteBuffer bb, int bi, int x) {
255 bb._put(bi + 3, int3(x));
256 bb._put(bi + 2, int2(x));
257 bb._put(bi + 1, int1(x));
258 bb._put(bi , int0(x));
259 }
260
261 static void putIntL(long a, int x) {
262 _put(a + 3, int3(x));
263 _put(a + 2, int2(x));
264 _put(a + 1, int1(x));
265 _put(a , int0(x));
266 }
267
268 static void putIntB(ByteBuffer bb, int bi, int x) {
269 bb._put(bi , int3(x));
270 bb._put(bi + 1, int2(x));
271 bb._put(bi + 2, int1(x));
272 bb._put(bi + 3, int0(x));
273 }
274
275 static void putIntB(long a, int x) {
276 _put(a , int3(x));
277 _put(a + 1, int2(x));
278 _put(a + 2, int1(x));
279 _put(a + 3, int0(x));
280 }
281
282 static void putInt(ByteBuffer bb, int bi, int x, boolean bigEndian) {
283 if (bigEndian)
284 putIntB(bb, bi, x);
285 else
286 putIntL(bb, bi, x);
287 }
288
289 static void putInt(long a, int x, boolean bigEndian) {
290 if (bigEndian)
291 putIntB(a, x);
292 else
293 putIntL(a, x);
294 }
295
296
297 // -- get/put long --
298
299 static private long makeLong(byte b7, byte b6, byte b5, byte b4,
300 byte b3, byte b2, byte b1, byte b0)
301 {
302 return ((((long)b7 ) << 56) |
303 (((long)b6 & 0xff) << 48) |
304 (((long)b5 & 0xff) << 40) |
305 (((long)b4 & 0xff) << 32) |
306 (((long)b3 & 0xff) << 24) |
307 (((long)b2 & 0xff) << 16) |
308 (((long)b1 & 0xff) << 8) |
309 (((long)b0 & 0xff) ));
310 }
311
312 static long getLongL(ByteBuffer bb, int bi) {
313 return makeLong(bb._get(bi + 7),
314 bb._get(bi + 6),
315 bb._get(bi + 5),
316 bb._get(bi + 4),
317 bb._get(bi + 3),
318 bb._get(bi + 2),
319 bb._get(bi + 1),
320 bb._get(bi ));
321 }
322
323 static long getLongL(long a) {
324 return makeLong(_get(a + 7),
325 _get(a + 6),
326 _get(a + 5),
327 _get(a + 4),
328 _get(a + 3),
329 _get(a + 2),
330 _get(a + 1),
331 _get(a ));
332 }
333
334 static long getLongB(ByteBuffer bb, int bi) {
335 return makeLong(bb._get(bi ),
336 bb._get(bi + 1),
337 bb._get(bi + 2),
338 bb._get(bi + 3),
339 bb._get(bi + 4),
340 bb._get(bi + 5),
341 bb._get(bi + 6),
342 bb._get(bi + 7));
343 }
344
345 static long getLongB(long a) {
346 return makeLong(_get(a ),
347 _get(a + 1),
348 _get(a + 2),
349 _get(a + 3),
350 _get(a + 4),
351 _get(a + 5),
352 _get(a + 6),
353 _get(a + 7));
354 }
355
356 static long getLong(ByteBuffer bb, int bi, boolean bigEndian) {
357 return bigEndian ? getLongB(bb, bi) : getLongL(bb, bi);
358 }
359
360 static long getLong(long a, boolean bigEndian) {
361 return bigEndian ? getLongB(a) : getLongL(a);
362 }
363
364 private static byte long7(long x) { return (byte)(x >> 56); }
365 private static byte long6(long x) { return (byte)(x >> 48); }
366 private static byte long5(long x) { return (byte)(x >> 40); }
367 private static byte long4(long x) { return (byte)(x >> 32); }
368 private static byte long3(long x) { return (byte)(x >> 24); }
369 private static byte long2(long x) { return (byte)(x >> 16); }
370 private static byte long1(long x) { return (byte)(x >> 8); }
371 private static byte long0(long x) { return (byte)(x ); }
372
373 static void putLongL(ByteBuffer bb, int bi, long x) {
374 bb._put(bi + 7, long7(x));
375 bb._put(bi + 6, long6(x));
376 bb._put(bi + 5, long5(x));
377 bb._put(bi + 4, long4(x));
378 bb._put(bi + 3, long3(x));
379 bb._put(bi + 2, long2(x));
380 bb._put(bi + 1, long1(x));
381 bb._put(bi , long0(x));
382 }
383
384 static void putLongL(long a, long x) {
385 _put(a + 7, long7(x));
386 _put(a + 6, long6(x));
387 _put(a + 5, long5(x));
388 _put(a + 4, long4(x));
389 _put(a + 3, long3(x));
390 _put(a + 2, long2(x));
391 _put(a + 1, long1(x));
392 _put(a , long0(x));
393 }
394
395 static void putLongB(ByteBuffer bb, int bi, long x) {
396 bb._put(bi , long7(x));
397 bb._put(bi + 1, long6(x));
398 bb._put(bi + 2, long5(x));
399 bb._put(bi + 3, long4(x));
400 bb._put(bi + 4, long3(x));
401 bb._put(bi + 5, long2(x));
402 bb._put(bi + 6, long1(x));
403 bb._put(bi + 7, long0(x));
404 }
405
406 static void putLongB(long a, long x) {
407 _put(a , long7(x));
408 _put(a + 1, long6(x));
409 _put(a + 2, long5(x));
410 _put(a + 3, long4(x));
411 _put(a + 4, long3(x));
412 _put(a + 5, long2(x));
413 _put(a + 6, long1(x));
414 _put(a + 7, long0(x));
415 }
416
417 static void putLong(ByteBuffer bb, int bi, long x, boolean bigEndian) {
418 if (bigEndian)
419 putLongB(bb, bi, x);
420 else
421 putLongL(bb, bi, x);
422 }
423
424 static void putLong(long a, long x, boolean bigEndian) {
425 if (bigEndian)
426 putLongB(a, x);
427 else
428 putLongL(a, x);
429 }
430
431
432 // -- get/put float --
433
434 static float getFloatL(ByteBuffer bb, int bi) {
435 return Float.intBitsToFloat(getIntL(bb, bi));
436 }
437
438 static float getFloatL(long a) {
439 return Float.intBitsToFloat(getIntL(a));
440 }
441
442 static float getFloatB(ByteBuffer bb, int bi) {
443 return Float.intBitsToFloat(getIntB(bb, bi));
444 }
445
446 static float getFloatB(long a) {
447 return Float.intBitsToFloat(getIntB(a));
448 }
449
450 static float getFloat(ByteBuffer bb, int bi, boolean bigEndian) {
451 return bigEndian ? getFloatB(bb, bi) : getFloatL(bb, bi);
452 }
453
454 static float getFloat(long a, boolean bigEndian) {
455 return bigEndian ? getFloatB(a) : getFloatL(a);
456 }
457
458 static void putFloatL(ByteBuffer bb, int bi, float x) {
459 putIntL(bb, bi, Float.floatToRawIntBits(x));
460 }
461
462 static void putFloatL(long a, float x) {
463 putIntL(a, Float.floatToRawIntBits(x));
464 }
465
466 static void putFloatB(ByteBuffer bb, int bi, float x) {
467 putIntB(bb, bi, Float.floatToRawIntBits(x));
468 }
469
470 static void putFloatB(long a, float x) {
471 putIntB(a, Float.floatToRawIntBits(x));
472 }
473
474 static void putFloat(ByteBuffer bb, int bi, float x, boolean bigEndian) {
475 if (bigEndian)
476 putFloatB(bb, bi, x);
477 else
478 putFloatL(bb, bi, x);
479 }
480
481 static void putFloat(long a, float x, boolean bigEndian) {
482 if (bigEndian)
483 putFloatB(a, x);
484 else
485 putFloatL(a, x);
486 }
487
488
489 // -- get/put double --
490
491 static double getDoubleL(ByteBuffer bb, int bi) {
492 return Double.longBitsToDouble(getLongL(bb, bi));
493 }
494
495 static double getDoubleL(long a) {
496 return Double.longBitsToDouble(getLongL(a));
497 }
498
499 static double getDoubleB(ByteBuffer bb, int bi) {
500 return Double.longBitsToDouble(getLongB(bb, bi));
501 }
502
503 static double getDoubleB(long a) {
504 return Double.longBitsToDouble(getLongB(a));
505 }
506
507 static double getDouble(ByteBuffer bb, int bi, boolean bigEndian) {
508 return bigEndian ? getDoubleB(bb, bi) : getDoubleL(bb, bi);
509 }
510
511 static double getDouble(long a, boolean bigEndian) {
512 return bigEndian ? getDoubleB(a) : getDoubleL(a);
513 }
514
515 static void putDoubleL(ByteBuffer bb, int bi, double x) {
516 putLongL(bb, bi, Double.doubleToRawLongBits(x));
517 }
518
519 static void putDoubleL(long a, double x) {
520 putLongL(a, Double.doubleToRawLongBits(x));
521 }
522
523 static void putDoubleB(ByteBuffer bb, int bi, double x) {
524 putLongB(bb, bi, Double.doubleToRawLongBits(x));
525 }
526
527 static void putDoubleB(long a, double x) {
528 putLongB(a, Double.doubleToRawLongBits(x));
529 }
530
531 static void putDouble(ByteBuffer bb, int bi, double x, boolean bigEndian) {
532 if (bigEndian)
533 putDoubleB(bb, bi, x);
534 else
535 putDoubleL(bb, bi, x);
536 }
537
538 static void putDouble(long a, double x, boolean bigEndian) {
539 if (bigEndian)
540 putDoubleB(a, x);
541 else
542 putDoubleL(a, x);
543 }
544
545
546 // -- Unsafe access --
547
548 private static final Unsafe unsafe = Unsafe.getUnsafe();
549
550 private static byte _get(long a) {
551 return unsafe.getByte(a);
552 }
553
554 private static void _put(long a, byte b) {
555 unsafe.putByte(a, b);
556 }
557
558 static Unsafe unsafe() {
559 return unsafe;
560 }
561
562
563 // -- Processor and memory-system properties --
564
565 private static final ByteOrder byteOrder;
566
567 static ByteOrder byteOrder() {
568 if (byteOrder == null)
569 throw new Error("Unknown byte order");
570 return byteOrder;
571 }
572
573 static {
574 long a = unsafe.allocateMemory(8);
575 try {
576 unsafe.putLong(a, 0x0102030405060708L);
577 byte b = unsafe.getByte(a);
578 switch (b) {
579 case 0x01: byteOrder = ByteOrder.BIG_ENDIAN; break;
580 case 0x08: byteOrder = ByteOrder.LITTLE_ENDIAN; break;
581 default:
582 assert false;
583 byteOrder = null;
584 }
585 } finally {
586 unsafe.freeMemory(a);
587 }
588 }
589
590
591 private static int pageSize = -1;
592
593 static int pageSize() {
594 if (pageSize == -1)
595 pageSize = unsafe().pageSize();
596 return pageSize;
597 }
598
599 static int pageCount(long size) {
600 return (int)(size + (long)pageSize() - 1L) / pageSize();
601 }
602
603 private static boolean unaligned;
604 private static boolean unalignedKnown = false;
605
606 static boolean unaligned() {
607 if (unalignedKnown)
608 return unaligned;
609 String arch = AccessController.doPrivileged(
610 new sun.security.action.GetPropertyAction("os.arch"));
611 unaligned = arch.equals("i386") || arch.equals("x86")
612 || arch.equals("amd64") || arch.equals("x86_64");
613 unalignedKnown = true;
614 return unaligned;
615 }
616
617
618 // -- Direct memory management --
619
620 // A user-settable upper limit on the maximum amount of allocatable
621 // direct buffer memory. This value may be changed during VM
622 // initialization if it is launched with "-XX:MaxDirectMemorySize=<size>".
623 private static volatile long maxMemory = VM.maxDirectMemory();
624 private static volatile long reservedMemory;
625 private static volatile long totalCapacity;
626 private static volatile long count;
627 private static boolean memoryLimitSet = false;
628
629 // These methods should be called whenever direct memory is allocated or
630 // freed. They allow the user to control the amount of direct memory
631 // which a process may access. All sizes are specified in bytes.
632 static void reserveMemory(long size, int cap) {
633 synchronized (Bits.class) {
634 if (!memoryLimitSet && VM.isBooted()) {
635 maxMemory = VM.maxDirectMemory();
636 memoryLimitSet = true;
637 }
638 // -XX:MaxDirectMemorySize limits the total capacity rather than the
639 // actual memory usage, which will differ when buffers are page
640 // aligned.
641 if (cap <= maxMemory - totalCapacity) {
642 reservedMemory += size;
643 totalCapacity += cap;
644 count++;
645 return;
646 }
647 }
648
649 System.gc();
650 try {
651 Thread.sleep(100);
652 } catch (InterruptedException x) {
653 // Restore interrupt status
654 Thread.currentThread().interrupt();
655 }
656 synchronized (Bits.class) {
657 if (totalCapacity + cap > maxMemory)
658 throw new OutOfMemoryError("Direct buffer memory");
659 reservedMemory += size;
660 totalCapacity += cap;
661 count++;
662 }
663
664 }
665
666 static synchronized void unreserveMemory(long size, int cap) {
667 if (reservedMemory > 0) {
668 reservedMemory -= size;
669 totalCapacity -= cap;
670 count--;
671 assert (reservedMemory > -1);
672 }
673 }
674
675 // -- Monitoring of direct buffer usage --
676
677 static {
678 // setup access to this package in SharedSecrets
679 sun.misc.SharedSecrets.setJavaNioAccess(
680 new sun.misc.JavaNioAccess() {
681 @Override
682 public sun.misc.JavaNioAccess.BufferPool getDirectBufferPool() {
683 return new sun.misc.JavaNioAccess.BufferPool() {
684 @Override
685 public String getName() {
686 return "direct";
687 }
688 @Override
689 public long getCount() {
690 return Bits.count;
691 }
692 @Override
693 public long getTotalCapacity() {
694 return Bits.totalCapacity;
695 }
696 @Override
697 public long getMemoryUsed() {
698 return Bits.reservedMemory;
699 }
700 };
701 }
702 @Override
703 public ByteBuffer newDirectByteBuffer(long addr, int cap, Object ob) {
704 return new DirectByteBuffer(addr, cap, ob);
705 }
706 @Override
707 public void truncate(Buffer buf) {
708 buf.truncate();
709 }
710 });
711 }
712
713 // -- Bulk get/put acceleration --
714
715 // These numbers represent the point at which we have empirically
716 // determined that the average cost of a JNI call exceeds the expense
717 // of an element by element copy. These numbers may change over time.
718 static final int JNI_COPY_TO_ARRAY_THRESHOLD = 6;
719 static final int JNI_COPY_FROM_ARRAY_THRESHOLD = 6;
720
721 // This number limits the number of bytes to copy per call to Unsafe's
722 // copyMemory method. A limit is imposed to allow for safepoint polling
723 // during a large copy
724 static final long UNSAFE_COPY_THRESHOLD = 1024L * 1024L;
725
726 // These methods do no bounds checking. Verification that the copy will not
727 // result in memory corruption should be done prior to invocation.
728 // All positions and lengths are specified in bytes.
729
730 /**
731 * Copy from given source array to destination address.
732 *
733 * @param src
734 * source array
735 * @param srcBaseOffset
736 * offset of first element of storage in source array
737 * @param srcPos
738 * offset within source array of the first element to read
739 * @param dstAddr
740 * destination address
741 * @param length
742 * number of bytes to copy
743 */
744 static void copyFromArray(Object src, long srcBaseOffset, long srcPos,
745 long dstAddr, long length)
746 {
747 long offset = srcBaseOffset + srcPos;
748 while (length > 0) {
749 long size = (length > UNSAFE_COPY_THRESHOLD) ? UNSAFE_COPY_THRESHOLD : length;
750 unsafe.copyMemory(src, offset, null, dstAddr, size);
751 length -= size;
752 offset += size;
753 dstAddr += size;
754 }
755 }
756
757 /**
758 * Copy from source address into given destination array.
759 *
760 * @param srcAddr
761 * source address
762 * @param dst
763 * destination array
764 * @param dstBaseOffset
765 * offset of first element of storage in destination array
766 * @param dstPos
767 * offset within destination array of the first element to write
768 * @param length
769 * number of bytes to copy
770 */
771 static void copyToArray(long srcAddr, Object dst, long dstBaseOffset, long dstPos,
772 long length)
773 {
774 long offset = dstBaseOffset + dstPos;
775 while (length > 0) {
776 long size = (length > UNSAFE_COPY_THRESHOLD) ? UNSAFE_COPY_THRESHOLD : length;
777 unsafe.copyMemory(null, srcAddr, dst, offset, size);
778 length -= size;
779 srcAddr += size;
780 offset += size;
781 }
782 }
783
784 static void copyFromCharArray(Object src, long srcPos, long dstAddr,
785 long length)
786 {
787 copyFromShortArray(src, srcPos, dstAddr, length);
788 }
789
790 static void copyToCharArray(long srcAddr, Object dst, long dstPos,
791 long length)
792 {
793 copyToShortArray(srcAddr, dst, dstPos, length);
794 }
795
796 static native void copyFromShortArray(Object src, long srcPos, long dstAddr,
797 long length);
798 static native void copyToShortArray(long srcAddr, Object dst, long dstPos,
799 long length);
800
801 static native void copyFromIntArray(Object src, long srcPos, long dstAddr,
802 long length);
803 static native void copyToIntArray(long srcAddr, Object dst, long dstPos,
804 long length);
805
806 static native void copyFromLongArray(Object src, long srcPos, long dstAddr,
807 long length);
808 static native void copyToLongArray(long srcAddr, Object dst, long dstPos,
809 long length);
810
811 }