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.runtime.arrays;
27
28 import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall;
29 import java.lang.invoke.MethodHandle;
30 import java.lang.invoke.MethodHandles;
31 import java.util.Arrays;
32 import jdk.nashorn.internal.runtime.JSType;
33 import jdk.nashorn.internal.runtime.ScriptRuntime;
34
35 /**
36 * Implementation of {@link ArrayData} as soon as an Object has been
37 * written to the array
38 */
39 final class ObjectArrayData extends ContinuousArrayData implements AnyElements {
40
41 /**
42 * The wrapped array
43 */
44 private Object[] array;
45
46 /**
47 * Constructor
48 * @param array an int array
49 * @param length a length, not necessarily array.length
50 */
51 ObjectArrayData(final Object[] array, final int length) {
52 super(length);
53 assert array.length >= length;
54 this.array = array;
55 }
56
57 @Override
58 public final Class<?> getElementType() {
59 return Object.class;
60 }
61
62 @Override
63 public final Class<?> getBoxedElementType() {
64 return getElementType();
65 }
66
67 @Override
68 public final int getElementWeight() {
69 return 4;
70 }
71
72 @Override
73 public final ContinuousArrayData widest(final ContinuousArrayData otherData) {
74 return otherData instanceof NumericElements ? this : otherData;
75 }
76
77 @Override
78 public ObjectArrayData copy() {
79 return new ObjectArrayData(array.clone(), (int)length());
80 }
81
82 @Override
83 public Object[] asObjectArray() {
84 return array.length == length() ? array.clone() : asObjectArrayCopy();
85 }
86
87 private Object[] asObjectArrayCopy() {
88 final long len = length();
89 assert len <= Integer.MAX_VALUE;
90 final Object[] copy = new Object[(int)len];
91 System.arraycopy(array, 0, copy, 0, (int)len);
92 return copy;
93 }
94
95 @Override
96 public ObjectArrayData convert(final Class<?> type) {
97 return this;
98 }
99
100 @Override
101 public ArrayData shiftLeft(final int by) {
102 if (by >= length()) {
103 shrink(0);
104 } else {
105 System.arraycopy(array, by, array, 0, array.length - by);
106 }
107 setLength(Math.max(0, length() - by));
108 return this;
109 }
110
111 @Override
112 public ArrayData shiftRight(final int by) {
113 final ArrayData newData = ensure(by + length() - 1);
114 if (newData != this) {
115 newData.shiftRight(by);
116 return newData;
117 }
118 System.arraycopy(array, 0, array, by, array.length - by);
119 return this;
120 }
121
122 @Override
123 public ArrayData ensure(final long safeIndex) {
124 if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) {
125 return new SparseArrayData(this, safeIndex + 1);
126 }
127 final int alen = array.length;
128 if (safeIndex >= alen) {
129 final int newLength = ArrayData.nextSize((int)safeIndex);
130 array = Arrays.copyOf(array, newLength); //fill with undefined or OK? TODO
131 }
132 if (safeIndex >= length()) {
133 setLength(safeIndex + 1);
134 }
135 return this;
136 }
137
138 @Override
139 public ArrayData shrink(final long newLength) {
140 Arrays.fill(array, (int) newLength, array.length, ScriptRuntime.UNDEFINED);
141 return this;
142 }
143
144 @Override
145 public ArrayData set(final int index, final Object value, final boolean strict) {
146 array[index] = value;
147 setLength(Math.max(index + 1, length()));
148 return this;
149 }
150
151 @Override
152 public ArrayData set(final int index, final int value, final boolean strict) {
153 array[index] = value;
154 setLength(Math.max(index + 1, length()));
155 return this;
156 }
157
158 @Override
159 public ArrayData set(final int index, final double value, final boolean strict) {
160 array[index] = value;
161 setLength(Math.max(index + 1, length()));
162 return this;
163 }
164
165 @Override
166 public ArrayData setEmpty(final int index) {
167 array[index] = ScriptRuntime.EMPTY;
168 return this;
169 }
170
171 @Override
172 public ArrayData setEmpty(final long lo, final long hi) {
173 // hi parameter is inclusive, but Arrays.fill toIndex parameter is exclusive
174 Arrays.fill(array, (int)Math.max(lo, 0L), (int)Math.min(hi + 1, Integer.MAX_VALUE), ScriptRuntime.EMPTY);
175 return this;
176 }
177
178 private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), ObjectArrayData.class, "getElem", Object.class, int.class).methodHandle();
179 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), ObjectArrayData.class, "setElem", void.class, int.class, Object.class).methodHandle();
180
181 @SuppressWarnings("unused")
182 private Object getElem(final int index) {
183 if (has(index)) {
184 return array[index];
185 }
186 throw new ClassCastException();
187 }
188
189 @SuppressWarnings("unused")
190 private void setElem(final int index, final Object elem) {
191 if (hasRoomFor(index)) {
192 array[index] = elem;
193 return;
194 }
195 throw new ClassCastException();
196 }
197
198 @Override
199 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
200 if (returnType.isPrimitive()) {
201 return null;
202 }
203 return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint);
204 }
205
206 @Override
207 public MethodHandle getElementSetter(final Class<?> elementType) {
208 return getContinuousElementSetter(SET_ELEM, Object.class);
209 }
210
211
212 @Override
213 public int getInt(final int index) {
214 return JSType.toInt32(array[index]);
215 }
216
217 @Override
218 public double getDouble(final int index) {
219 return JSType.toNumber(array[index]);
220 }
221
222 @Override
223 public Object getObject(final int index) {
224 return array[index];
225 }
226
227 @Override
228 public boolean has(final int index) {
229 return 0 <= index && index < length();
230 }
231
232 @Override
233 public ArrayData delete(final int index) {
234 setEmpty(index);
235 return new DeletedRangeArrayFilter(this, index, index);
236 }
237
238 @Override
239 public ArrayData delete(final long fromIndex, final long toIndex) {
240 setEmpty(fromIndex, toIndex);
241 return new DeletedRangeArrayFilter(this, fromIndex, toIndex);
242 }
243
244 @Override
245 public double fastPush(final int arg) {
246 return fastPush((Object)arg);
247 }
248
249 @Override
250 public double fastPush(final long arg) {
251 return fastPush((Object)arg);
252 }
253
254 @Override
255 public double fastPush(final double arg) {
256 return fastPush((Object)arg);
257 }
258
259 @Override
260 public double fastPush(final Object arg) {
261 final int len = (int)length();
262 if (len == array.length) {
263 array = Arrays.copyOf(array, nextSize(len));
264 }
265 array[len] = arg;
266 return increaseLength();
267 }
268
269 @Override
270 public Object fastPopObject() {
271 if (length() == 0) {
272 return ScriptRuntime.UNDEFINED;
273 }
274 final int newLength = (int)decreaseLength();
275 final Object elem = array[newLength];
276 array[newLength] = ScriptRuntime.EMPTY;
277 return elem;
278 }
279
280 @Override
281 public Object pop() {
282 if (length() == 0) {
283 return ScriptRuntime.UNDEFINED;
284 }
285
286 final int newLength = (int)length() - 1;
287 final Object elem = array[newLength];
288 setEmpty(newLength);
289 setLength(newLength);
290 return elem;
291 }
292
293 @Override
294 public ArrayData slice(final long from, final long to) {
295 final long start = from < 0 ? from + length() : from;
296 final long newLength = to - start;
297 return new ObjectArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)newLength);
298 }
299
300 @Override
301 public ArrayData push(final boolean strict, final Object item) {
302 final long len = length();
303 final ArrayData newData = ensure(len);
304 if (newData == this) {
305 array[(int)len] = item;
306 return this;
307 }
308 return newData.set((int)len, item, strict);
309 }
310
311 @Override
312 public ArrayData fastSplice(final int start, final int removed, final int added) throws UnsupportedOperationException {
313 final long oldLength = length();
314 final long newLength = oldLength - removed + added;
315 if (newLength > SparseArrayData.MAX_DENSE_LENGTH && newLength > array.length) {
316 throw new UnsupportedOperationException();
317 }
318 final ArrayData returnValue = removed == 0 ?
319 EMPTY_ARRAY : new ObjectArrayData(Arrays.copyOfRange(array, start, start + removed), removed);
320
321 if (newLength != oldLength) {
322 final Object[] newArray;
323
324 if (newLength > array.length) {
325 newArray = new Object[ArrayData.nextSize((int)newLength)];
326 System.arraycopy(array, 0, newArray, 0, start);
327 } else {
328 newArray = array;
329 }
330
331 System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed));
332 array = newArray;
333 setLength(newLength);
334 }
335
336 return returnValue;
337 }
338
339 @Override
340 public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) {
341 final int otherLength = (int)otherData.length();
342 final int thisLength = (int)length();
343 assert otherLength > 0 && thisLength > 0;
344
345 final Object[] otherArray = ((ObjectArrayData)otherData).array;
346 final int newLength = otherLength + thisLength;
347 final Object[] newArray = new Object[ArrayData.alignUp(newLength)];
348
349 System.arraycopy(array, 0, newArray, 0, thisLength);
350 System.arraycopy(otherArray, 0, newArray, thisLength, otherLength);
351
352 return new ObjectArrayData(newArray, newLength);
353 }
354
355 @Override
356 public String toString() {
357 assert length() <= array.length : length() + " > " + array.length;
358 return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length()));
359 }
360 }