1 /*
2 * Copyright (c) 2010, 2013, 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.nashorn.internal.objects;
27
28 import static jdk.nashorn.internal.runtime.ECMAErrors.rangeError;
29
30 import jdk.nashorn.internal.objects.annotations.Attribute;
31 import jdk.nashorn.internal.objects.annotations.Getter;
32 import jdk.nashorn.internal.objects.annotations.ScriptClass;
33 import jdk.nashorn.internal.runtime.JSType;
34 import jdk.nashorn.internal.runtime.PropertyMap;
35 import jdk.nashorn.internal.runtime.ScriptObject;
36 import jdk.nashorn.internal.runtime.ScriptRuntime;
37 import jdk.nashorn.internal.runtime.arrays.ArrayData;
38
39 @ScriptClass("ArrayBufferView")
40 abstract class ArrayBufferView extends ScriptObject {
41
42 // initialized by nasgen
43 private static PropertyMap $nasgenmap$;
44
45 static PropertyMap getInitialMap() {
46 return $nasgenmap$;
47 }
48
49 private ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength, final Global global) {
50 super(getInitialMap());
51 checkConstructorArgs(buffer, byteOffset, elementLength);
52 this.setProto(getPrototype(global));
53 this.setArray(factory().createArrayData(buffer, byteOffset, elementLength));
54 }
55
56 ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
57 this(buffer, byteOffset, elementLength, Global.instance());
58 }
59
60 private void checkConstructorArgs(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
61 if (byteOffset < 0 || elementLength < 0) {
62 throw new RuntimeException("byteOffset or length must not be negative");
63 }
64 if (byteOffset + elementLength * bytesPerElement() > buffer.getByteLength()) {
65 throw new RuntimeException("byteOffset + byteLength out of range");
66 }
67 if (byteOffset % bytesPerElement() != 0) {
68 throw new RuntimeException("byteOffset must be a multiple of the element size");
69 }
70 }
71
72 private int bytesPerElement() {
73 return factory().bytesPerElement;
74 }
75
76 @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
77 public static Object buffer(final Object self) {
78 return ((ArrayDataImpl)((ArrayBufferView)self).getArray()).buffer;
79 }
80
81 @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
82 public static Object byteOffset(final Object self) {
83 return ((ArrayDataImpl)((ArrayBufferView)self).getArray()).byteOffset;
84 }
85
86 @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
87 public static Object byteLength(final Object self) {
88 final ArrayBufferView view = (ArrayBufferView)self;
89 return ((ArrayDataImpl)view.getArray()).elementLength * view.bytesPerElement();
90 }
91
92 @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
93 public static Object length(final Object self) {
94 return ((ArrayBufferView)self).elementLength();
95 }
96
97 @Override
98 public final Object getLength() {
99 return elementLength();
100 }
101
102 private int elementLength() {
103 return ((ArrayDataImpl)getArray()).elementLength;
104 }
105
106 protected static abstract class ArrayDataImpl extends ArrayData {
107 protected final NativeArrayBuffer buffer;
108 protected final int byteOffset;
109 private final int elementLength;
110
111 protected ArrayDataImpl(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
112 super(elementLength);
113 this.buffer = buffer;
114 this.byteOffset = byteOffset;
115 this.elementLength = elementLength;
116 }
117
118 @Override
119 public ArrayData copy() {
120 throw new UnsupportedOperationException(); // Not used for ArrayBuffers
121 }
122
123 @Override
124 public Object[] asObjectArray() {
125 final Object[] array = new Object[elementLength];
126 for (int i = 0; i < elementLength; i++) {
127 array[i] = getObjectImpl(i);
128 }
129 return array;
130 }
131
132 @Override
133 public ArrayData ensure(final long safeIndex) {
134 return this;
135 }
136
137 @Override
138 public void setLength(final long length) {
139 //empty?
140 //TODO is this right?
141 }
142
143 @Override
144 public ArrayData shrink(final long newLength) {
145 return this;
146 }
147
148 @Override
149 public ArrayData set(final int index, final Object value, final boolean strict) {
150 if (has(index)) {
151 setImpl(index, value);
152 }
153 return this;
154 }
155
156 @Override
157 public ArrayData set(final int index, final int value, final boolean strict) {
158 if (has(index)) {
159 setImpl(index, value);
160 }
161 return this;
162 }
163
164 @Override
165 public ArrayData set(final int index, final long value, final boolean strict) {
166 if (has(index)) {
167 setImpl(index, value);
168 }
169 return this;
170 }
171
172 @Override
173 public ArrayData set(final int index, final double value, final boolean strict) {
174 if (has(index)) {
175 setImpl(index, value);
176 }
177 return this;
178 }
179
180 @Override
181 public int getInt(final int index) {
182 return getIntImpl(index);
183 }
184
185 @Override
186 public long getLong(final int index) {
187 return getLongImpl(index);
188 }
189
190 @Override
191 public double getDouble(final int index) {
192 return getDoubleImpl(index);
193 }
194
195 @Override
196 public Object getObject(final int index) {
197 return getObjectImpl(index);
198 }
199
200 @Override
201 public boolean has(final int index) {
202 return index >= 0 && index < elementLength;
203 }
204
205 @Override
206 public boolean canDelete(final int index, final boolean strict) {
207 return false;
208 }
209
210 @Override
211 public boolean canDelete(final long fromIndex, final long toIndex, final boolean strict) {
212 return false;
213 }
214
215 @Override
216 public ArrayData delete(final int index) {
217 return this;
218 }
219
220 @Override
221 public ArrayData delete(final long fromIndex, final long toIndex) {
222 return this;
223 }
224
225 @Override
226 protected ArrayData convert(final Class<?> type) {
227 return this;
228 }
229
230 @Override
231 public void shiftLeft(final int by) {
232 throw new UnsupportedOperationException();
233 }
234
235 @Override
236 public ArrayData shiftRight(final int by) {
237 throw new UnsupportedOperationException();
238 }
239
240 @Override
241 public Object pop() {
242 throw new UnsupportedOperationException();
243 }
244
245 @Override
246 public ArrayData slice(final long from, final long to) {
247 throw new UnsupportedOperationException();
248 }
249
250 protected abstract int getIntImpl(int key);
251
252 protected long getLongImpl(final int key) {
253 return getIntImpl(key);
254 }
255
256 protected double getDoubleImpl(final int key) {
257 return getIntImpl(key);
258 }
259
260 protected Object getObjectImpl(final int key) {
261 return getIntImpl(key);
262 }
263
264 protected abstract void setImpl(int key, int value);
265
266 protected void setImpl(final int key, final long value) {
267 setImpl(key, (int)value);
268 }
269
270 protected void setImpl(final int key, final double value) {
271 setImpl(key, JSType.toInt32(value));
272 }
273
274 protected void setImpl(final int key, final Object value) {
275 setImpl(key, JSType.toInt32(value));
276 }
277
278 protected abstract int byteIndex(int index);
279 }
280
281 protected static abstract class Factory {
282 final int bytesPerElement;
283 final int maxElementLength;
284
285 public Factory(final int bytesPerElement) {
286 this.bytesPerElement = bytesPerElement;
287 this.maxElementLength = Integer.MAX_VALUE / bytesPerElement;
288 }
289
290 public final ArrayBufferView construct(final int elementLength) {
291 if(elementLength > maxElementLength) {
292 throw rangeError("inappropriate.array.buffer.length", JSType.toString(elementLength));
293 }
294 return construct(new NativeArrayBuffer(elementLength * bytesPerElement), 0, elementLength);
295 }
296
297 public abstract ArrayBufferView construct(NativeArrayBuffer buffer, int byteOffset, int elementLength);
298
299 public abstract ArrayData createArrayData(NativeArrayBuffer buffer, int byteOffset, int elementLength);
300 }
301
302 protected abstract Factory factory();
303
304 protected abstract ScriptObject getPrototype(final Global global);
305
306 protected boolean isFloatArray() {
307 return false;
308 }
309
310 protected static ArrayBufferView constructorImpl(final Object[] args, final Factory factory) {
311 final Object arg0 = args.length != 0 ? args[0] : 0;
312 final ArrayBufferView dst;
313 final int length;
314 if (arg0 instanceof NativeArrayBuffer) {
315 // Constructor(ArrayBuffer buffer, optional unsigned long byteOffset, optional unsigned long length)
316 final NativeArrayBuffer buffer = (NativeArrayBuffer) arg0;
317 final int byteOffset = args.length > 1 ? JSType.toInt32(args[1]) : 0;
318 if (args.length > 2) {
319 length = JSType.toInt32(args[2]);
320 } else {
321 if ((buffer.getByteLength() - byteOffset) % factory.bytesPerElement != 0) {
322 throw new RuntimeException("buffer.byteLength - byteOffset must be a multiple of the element size");
323 }
324 length = (buffer.getByteLength() - byteOffset) / factory.bytesPerElement;
325 }
326 return factory.construct(buffer, byteOffset, length);
327 } else if (arg0 instanceof ArrayBufferView) {
328 // Constructor(TypedArray array)
329 length = ((ArrayBufferView)arg0).elementLength();
330 dst = factory.construct(length);
331 } else if (arg0 instanceof NativeArray) {
332 // Constructor(type[] array)
333 length = lengthToInt(((NativeArray) arg0).getArray().length());
334 dst = factory.construct(length);
335 } else {
336 // Constructor(unsigned long length)
337 length = lengthToInt(JSType.toInt64(arg0));
338 return factory.construct(length);
339 }
340
341 copyElements(dst, length, (ScriptObject)arg0, 0);
342 return dst;
343 }
344
345 protected static Object setImpl(final Object self, final Object array, final Object offset0) {
346 final ArrayBufferView dest = ((ArrayBufferView)self);
347 final int length;
348 if (array instanceof ArrayBufferView) {
349 // void set(TypedArray array, optional unsigned long offset)
350 length = ((ArrayBufferView)array).elementLength();
351 } else if (array instanceof NativeArray) {
352 // void set(type[] array, optional unsigned long offset)
353 length = (int) (((NativeArray) array).getArray().length() & 0x7fff_ffff);
354 } else {
355 throw new RuntimeException("argument is not of array type");
356 }
357
358 final ScriptObject source = (ScriptObject) array;
359 final int offset = JSType.toInt32(offset0); // default=0
360
361 if (dest.elementLength() < length + offset || offset < 0) {
362 throw new RuntimeException("offset or array length out of bounds");
363 }
364
365 copyElements(dest, length, source, offset);
366
367 return ScriptRuntime.UNDEFINED;
368 }
369
370 private static void copyElements(final ArrayBufferView dest, final int length, final ScriptObject source, final int offset) {
371 if (!dest.isFloatArray()) {
372 for (int i = 0, j = offset; i < length; i++, j++) {
373 dest.set(j, source.getInt(i), false);
374 }
375 } else {
376 for (int i = 0, j = offset; i < length; i++, j++) {
377 dest.set(j, source.getDouble(i), false);
378 }
379 }
380 }
381
382 private static int lengthToInt(final long length) {
383 if (length > Integer.MAX_VALUE || length < 0) {
384 throw rangeError("inappropriate.array.buffer.length", JSType.toString(length));
385 }
386 return (int) (length & Integer.MAX_VALUE);
387 }
388
389 protected static Object subarrayImpl(final Object self, final Object begin0, final Object end0) {
390 final ArrayBufferView arrayView = ((ArrayBufferView)self);
391 final int elementLength = arrayView.elementLength();
392 final int begin = NativeArrayBuffer.adjustIndex(JSType.toInt32(begin0), elementLength);
393 final int end = NativeArrayBuffer.adjustIndex(end0 != ScriptRuntime.UNDEFINED ? JSType.toInt32(end0) : elementLength, elementLength);
394 final ArrayDataImpl arrayData = (ArrayDataImpl)arrayView.getArray();
395 return arrayView.factory().construct(arrayData.buffer, arrayData.byteIndex(begin), Math.max(end - begin, 0));
396 }
397 }