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