1 /* 2 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 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 #warn This file is preprocessed before being compiled 27 28 package java.nio; 29 30 import java.io.FileDescriptor; 31 import jdk.internal.misc.Unsafe; 32 import jdk.internal.misc.VM; 33 import java.lang.ref.Cleaner; 34 import jdk.internal.ref.CleanerFactory; 35 import sun.nio.ch.DirectBuffer; 36 37 38 class Direct$Type$Buffer$RW$$BO$ 39 #if[rw] 40 extends {#if[byte]?Mapped$Type$Buffer:$Type$Buffer} 41 #else[rw] 42 extends Direct$Type$Buffer$BO$ 43 #end[rw] 44 implements DirectBuffer 45 { 46 47 #if[rw] 48 49 // Cached unsafe-access object 50 protected static final Unsafe unsafe = Bits.unsafe(); 51 52 // Cached array base offset 53 private static final long arrayBaseOffset = (long)unsafe.arrayBaseOffset($type$[].class); 54 55 // Cached unaligned-access capability 56 protected static final boolean unaligned = Bits.unaligned(); 57 58 // Base address, used in all indexing calculations 59 // NOTE: moved up to Buffer.java for speed in JNI GetDirectBufferAddress 60 // protected long address; 61 62 // An object attached to this buffer. If this buffer is a view of another 63 // buffer then we use this field to keep a reference to that buffer to 64 // ensure that its memory isn't freed before we are done with it. 65 private final Object att; 66 67 public Object attachment() { 68 return att; 69 } 70 71 #if[byte] 72 73 private static class Deallocator 74 implements Runnable 75 { 76 77 private static Unsafe unsafe = Unsafe.getUnsafe(); 78 79 private long address; 80 private long size; 81 private int capacity; 82 83 private Deallocator(long address, long size, int capacity) { 84 assert (address != 0); 85 this.address = address; 86 this.size = size; 87 this.capacity = capacity; 88 } 89 90 public void run() { 91 if (address == 0) { 92 // Paranoia 93 return; 94 } 95 unsafe.freeMemory(address); 96 address = 0; 97 Bits.unreserveMemory(size, capacity); 98 } 99 100 } 101 102 private final Cleaner.Cleanable cleaner; 103 104 public Cleaner.Cleanable cleaner() { return cleaner; } 105 106 #else[byte] 107 108 public Cleaner.Cleanable cleaner() { return null; } 109 110 #end[byte] 111 112 #end[rw] 113 114 #if[byte] 115 116 // Primary constructor 117 // 118 Direct$Type$Buffer$RW$(int cap) { // package-private 119 #if[rw] 120 super(-1, 0, cap, cap); 121 boolean pa = VM.isDirectMemoryPageAligned(); 122 int ps = Bits.pageSize(); 123 long size = Math.max(1L, (long)cap + (pa ? ps : 0)); 124 Bits.reserveMemory(size, cap); 125 126 long base = 0; 127 try { 128 base = unsafe.allocateMemory(size); 129 } catch (OutOfMemoryError x) { 130 Bits.unreserveMemory(size, cap); 131 throw x; 132 } 133 unsafe.setMemory(base, size, (byte) 0); 134 if (pa && (base % ps != 0)) { 135 // Round up to page boundary 136 address = base + ps - (base & (ps - 1)); 137 } else { 138 address = base; 139 } 140 cleaner = CleanerFactory.cleaner().register(this, new Deallocator(base, size, cap)); 141 att = null; 142 #else[rw] 143 super(cap); 144 #end[rw] 145 } 146 147 #if[rw] 148 149 // Invoked to construct a direct ByteBuffer referring to the block of 150 // memory. A given arbitrary object may also be attached to the buffer. 151 // 152 Direct$Type$Buffer(long addr, int cap, Object ob) { 153 super(-1, 0, cap, cap); 154 address = addr; 155 cleaner = null; 156 att = ob; 157 } 158 159 160 // Invoked only by JNI: NewDirectByteBuffer(void*, long) 161 // 162 private Direct$Type$Buffer(long addr, int cap) { 163 super(-1, 0, cap, cap); 164 address = addr; 165 cleaner = null; 166 att = null; 167 } 168 169 #end[rw] 170 171 // For memory-mapped buffers -- invoked by FileChannelImpl via reflection 172 // 173 protected Direct$Type$Buffer$RW$(int cap, long addr, 174 FileDescriptor fd, 175 Runnable unmapper) 176 { 177 #if[rw] 178 super(-1, 0, cap, cap, fd); 179 address = addr; 180 cleaner = (unmapper == null) 181 ? null 182 : CleanerFactory.cleaner().register(this, unmapper); 183 att = null; 184 #else[rw] 185 super(cap, addr, fd, unmapper); 186 #end[rw] 187 } 188 189 #end[byte] 190 191 // For duplicates and slices 192 // 193 Direct$Type$Buffer$RW$$BO$(DirectBuffer db, // package-private 194 int mark, int pos, int lim, int cap, 195 int off) 196 { 197 #if[rw] 198 super(mark, pos, lim, cap); 199 address = db.address() + off; 200 #if[byte] 201 cleaner = null; 202 #end[byte] 203 att = db; 204 #else[rw] 205 super(db, mark, pos, lim, cap, off); 206 #end[rw] 207 } 208 209 public $Type$Buffer slice() { 210 int pos = this.position(); 211 int lim = this.limit(); 212 assert (pos <= lim); 213 int rem = (pos <= lim ? lim - pos : 0); 214 int off = (pos << $LG_BYTES_PER_VALUE$); 215 assert (off >= 0); 216 return new Direct$Type$Buffer$RW$$BO$(this, -1, 0, rem, rem, off); 217 } 218 219 public $Type$Buffer duplicate() { 220 return new Direct$Type$Buffer$RW$$BO$(this, 221 this.markValue(), 222 this.position(), 223 this.limit(), 224 this.capacity(), 225 0); 226 } 227 228 public $Type$Buffer asReadOnlyBuffer() { 229 #if[rw] 230 return new Direct$Type$BufferR$BO$(this, 231 this.markValue(), 232 this.position(), 233 this.limit(), 234 this.capacity(), 235 0); 236 #else[rw] 237 return duplicate(); 238 #end[rw] 239 } 240 241 #if[rw] 242 243 public long address() { 244 return address; 245 } 246 247 private long ix(int i) { 248 return address + ((long)i << $LG_BYTES_PER_VALUE$); 249 } 250 251 public $type$ get() { 252 return $fromBits$($swap$(unsafe.get$Swaptype$(ix(nextGetIndex())))); 253 } 254 255 public $type$ get(int i) { 256 return $fromBits$($swap$(unsafe.get$Swaptype$(ix(checkIndex(i))))); 257 } 258 259 #if[streamableType] 260 $type$ getUnchecked(int i) { 261 return $fromBits$($swap$(unsafe.get$Swaptype$(ix(i)))); 262 } 263 #end[streamableType] 264 265 public $Type$Buffer get($type$[] dst, int offset, int length) { 266 #if[rw] 267 if (((long)length << $LG_BYTES_PER_VALUE$) > Bits.JNI_COPY_TO_ARRAY_THRESHOLD) { 268 checkBounds(offset, length, dst.length); 269 int pos = position(); 270 int lim = limit(); 271 assert (pos <= lim); 272 int rem = (pos <= lim ? lim - pos : 0); 273 if (length > rem) 274 throw new BufferUnderflowException(); 275 276 #if[!byte] 277 if (order() != ByteOrder.nativeOrder()) 278 Bits.copyTo$Memtype$Array(ix(pos), dst, 279 (long)offset << $LG_BYTES_PER_VALUE$, 280 (long)length << $LG_BYTES_PER_VALUE$); 281 else 282 #end[!byte] 283 Bits.copyToArray(ix(pos), dst, arrayBaseOffset, 284 (long)offset << $LG_BYTES_PER_VALUE$, 285 (long)length << $LG_BYTES_PER_VALUE$); 286 position(pos + length); 287 } else { 288 super.get(dst, offset, length); 289 } 290 return this; 291 #else[rw] 292 throw new ReadOnlyBufferException(); 293 #end[rw] 294 } 295 296 #end[rw] 297 298 public $Type$Buffer put($type$ x) { 299 #if[rw] 300 unsafe.put$Swaptype$(ix(nextPutIndex()), $swap$($toBits$(x))); 301 return this; 302 #else[rw] 303 throw new ReadOnlyBufferException(); 304 #end[rw] 305 } 306 307 public $Type$Buffer put(int i, $type$ x) { 308 #if[rw] 309 unsafe.put$Swaptype$(ix(checkIndex(i)), $swap$($toBits$(x))); 310 return this; 311 #else[rw] 312 throw new ReadOnlyBufferException(); 313 #end[rw] 314 } 315 316 public $Type$Buffer put($Type$Buffer src) { 317 #if[rw] 318 if (src instanceof Direct$Type$Buffer$BO$) { 319 if (src == this) 320 throw createSameBufferException(); 321 Direct$Type$Buffer$RW$$BO$ sb = (Direct$Type$Buffer$RW$$BO$)src; 322 323 int spos = sb.position(); 324 int slim = sb.limit(); 325 assert (spos <= slim); 326 int srem = (spos <= slim ? slim - spos : 0); 327 328 int pos = position(); 329 int lim = limit(); 330 assert (pos <= lim); 331 int rem = (pos <= lim ? lim - pos : 0); 332 333 if (srem > rem) 334 throw new BufferOverflowException(); 335 unsafe.copyMemory(sb.ix(spos), ix(pos), (long)srem << $LG_BYTES_PER_VALUE$); 336 sb.position(spos + srem); 337 position(pos + srem); 338 } else if (src.hb != null) { 339 340 int spos = src.position(); 341 int slim = src.limit(); 342 assert (spos <= slim); 343 int srem = (spos <= slim ? slim - spos : 0); 344 345 put(src.hb, src.offset + spos, srem); 346 src.position(spos + srem); 347 348 } else { 349 super.put(src); 350 } 351 return this; 352 #else[rw] 353 throw new ReadOnlyBufferException(); 354 #end[rw] 355 } 356 357 public $Type$Buffer put($type$[] src, int offset, int length) { 358 #if[rw] 359 if (((long)length << $LG_BYTES_PER_VALUE$) > Bits.JNI_COPY_FROM_ARRAY_THRESHOLD) { 360 checkBounds(offset, length, src.length); 361 int pos = position(); 362 int lim = limit(); 363 assert (pos <= lim); 364 int rem = (pos <= lim ? lim - pos : 0); 365 if (length > rem) 366 throw new BufferOverflowException(); 367 368 #if[!byte] 369 if (order() != ByteOrder.nativeOrder()) 370 Bits.copyFrom$Memtype$Array(src, 371 (long)offset << $LG_BYTES_PER_VALUE$, 372 ix(pos), 373 (long)length << $LG_BYTES_PER_VALUE$); 374 else 375 #end[!byte] 376 Bits.copyFromArray(src, arrayBaseOffset, 377 (long)offset << $LG_BYTES_PER_VALUE$, 378 ix(pos), 379 (long)length << $LG_BYTES_PER_VALUE$); 380 position(pos + length); 381 } else { 382 super.put(src, offset, length); 383 } 384 return this; 385 #else[rw] 386 throw new ReadOnlyBufferException(); 387 #end[rw] 388 } 389 390 public $Type$Buffer compact() { 391 #if[rw] 392 int pos = position(); 393 int lim = limit(); 394 assert (pos <= lim); 395 int rem = (pos <= lim ? lim - pos : 0); 396 397 unsafe.copyMemory(ix(pos), ix(0), (long)rem << $LG_BYTES_PER_VALUE$); 398 position(rem); 399 limit(capacity()); 400 discardMark(); 401 return this; 402 #else[rw] 403 throw new ReadOnlyBufferException(); 404 #end[rw] 405 } 406 407 public boolean isDirect() { 408 return true; 409 } 410 411 public boolean isReadOnly() { 412 return {#if[rw]?false:true}; 413 } 414 415 416 #if[char] 417 418 public String toString(int start, int end) { 419 if ((end > limit()) || (start > end)) 420 throw new IndexOutOfBoundsException(); 421 try { 422 int len = end - start; 423 char[] ca = new char[len]; 424 CharBuffer cb = CharBuffer.wrap(ca); 425 CharBuffer db = this.duplicate(); 426 db.position(start); 427 db.limit(end); 428 cb.put(db); 429 return new String(ca); 430 } catch (StringIndexOutOfBoundsException x) { 431 throw new IndexOutOfBoundsException(); 432 } 433 } 434 435 436 // --- Methods to support CharSequence --- 437 438 public CharBuffer subSequence(int start, int end) { 439 int pos = position(); 440 int lim = limit(); 441 assert (pos <= lim); 442 pos = (pos <= lim ? pos : lim); 443 int len = lim - pos; 444 445 if ((start < 0) || (end > len) || (start > end)) 446 throw new IndexOutOfBoundsException(); 447 return new DirectCharBuffer$RW$$BO$(this, 448 -1, 449 pos + start, 450 pos + end, 451 capacity(), 452 offset); 453 } 454 455 #end[char] 456 457 458 459 #if[!byte] 460 461 public ByteOrder order() { 462 #if[boS] 463 return ((ByteOrder.nativeOrder() == ByteOrder.BIG_ENDIAN) 464 ? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN); 465 #end[boS] 466 #if[boU] 467 return ((ByteOrder.nativeOrder() != ByteOrder.BIG_ENDIAN) 468 ? ByteOrder.LITTLE_ENDIAN : ByteOrder.BIG_ENDIAN); 469 #end[boU] 470 } 471 472 #end[!byte] 473 474 475 476 #if[byte] 477 478 byte _get(int i) { // package-private 479 return unsafe.getByte(address + i); 480 } 481 482 void _put(int i, byte b) { // package-private 483 #if[rw] 484 unsafe.putByte(address + i, b); 485 #else[rw] 486 throw new ReadOnlyBufferException(); 487 #end[rw] 488 } 489 490 // #BIN 491 // 492 // Binary-data access methods for short, char, int, long, float, 493 // and double will be inserted here 494 495 #end[byte] 496 497 }