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
30 import java.lang.invoke.MethodHandle;
31 import java.lang.invoke.MethodHandles;
32 import java.util.Arrays;
33 import jdk.nashorn.internal.runtime.JSType;
34 import jdk.nashorn.internal.runtime.ScriptRuntime;
35
36 /**
37 * Implementation of {@link ArrayData} as soon as an int has been
38 * written to the array. This is the default data for new arrays
39 */
40 final class IntArrayData extends ContinuousArrayData implements IntElements {
41 /**
42 * The wrapped array
43 */
44 private int[] array;
45
46 IntArrayData() {
47 this(new int[ArrayData.CHUNK_SIZE], 0);
48 }
49
50 IntArrayData(final int length) {
51 super(length);
52 this.array = new int[ArrayData.nextSize(length)];
53 }
54
55 /**
56 * Constructor
57 * @param array an int array
58 * @param length a length, not necessarily array.length
59 */
60 IntArrayData(final int[] array, final int length) {
61 super(length);
62 assert array == null || array.length >= length;
63 this.array = array;
64 }
65
66 @Override
67 public final Class<?> getElementType() {
68 return int.class;
69 }
70
71 @Override
72 public final Class<?> getBoxedElementType() {
73 return Integer.class;
74 }
75
76 @Override
77 public final int getElementWeight() {
78 return 1;
79 }
80
81 @Override
82 public final ContinuousArrayData widest(final ContinuousArrayData otherData) {
83 return otherData;
84 }
85
86 private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), IntArrayData.class, "getElem", int.class, int.class).methodHandle();
87 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), IntArrayData.class, "setElem", void.class, int.class, int.class).methodHandle();
88
89 @Override
90 public Object[] asObjectArray() {
91 return toObjectArray(true);
92 }
93
94 @SuppressWarnings("unused")
95 private int getElem(final int index) {
96 if (has(index)) {
97 return array[index];
98 }
99 throw new ClassCastException();
100 }
101
102 @SuppressWarnings("unused")
103 private void setElem(final int index, final int elem) {
104 if (hasRoomFor(index)) {
105 array[index] = elem;
106 return;
107 }
108 throw new ClassCastException();
109 }
110
111 @Override
112 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
113 return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint);
114 }
115
116 @Override
117 public MethodHandle getElementSetter(final Class<?> elementType) {
118 return elementType == int.class ? getContinuousElementSetter(SET_ELEM, elementType) : null;
119 }
120
121 @Override
122 public IntArrayData copy() {
123 return new IntArrayData(array.clone(), (int)length());
124 }
125
126 @Override
127 public Object asArrayOfType(final Class<?> componentType) {
128 if (componentType == int.class) {
129 final int len = (int)length();
130 return array.length == len ? array.clone() : Arrays.copyOf(array, len);
131 }
132 return super.asArrayOfType(componentType);
133 }
134
135 private Object[] toObjectArray(final boolean trim) {
136 assert length() <= array.length : "length exceeds internal array size";
137 final int len = (int)length();
138 final Object[] oarray = new Object[trim ? len : array.length];
139
140 for (int index = 0; index < len; index++) {
141 oarray[index] = array[index];
142 }
143
144 return oarray;
145 }
146
147 private double[] toDoubleArray() {
148 assert length() <= array.length : "length exceeds internal array size";
149 final int len = (int)length();
150 final double[] darray = new double[array.length];
151
152 for (int index = 0; index < len; index++) {
153 darray[index] = array[index];
154 }
155
156 return darray;
157 }
158
159 private NumberArrayData convertToDouble() {
160 return new NumberArrayData(toDoubleArray(), (int)length());
161 }
162
163 private ObjectArrayData convertToObject() {
164 return new ObjectArrayData(toObjectArray(false), (int)length());
165 }
166
167 @Override
168 public ArrayData convert(final Class<?> type) {
169 if (type == Integer.class || type == Byte.class || type == Short.class) {
170 return this;
171 } else if (type == Double.class || type == Float.class) {
172 return convertToDouble();
173 } else {
174 return convertToObject();
175 }
176 }
177
178 @Override
179 public void shiftLeft(final int by) {
180 System.arraycopy(array, by, array, 0, array.length - by);
181 }
182
183 @Override
184 public ArrayData shiftRight(final int by) {
185 final ArrayData newData = ensure(by + length() - 1);
186 if (newData != this) {
187 newData.shiftRight(by);
188 return newData;
189 }
190 System.arraycopy(array, 0, array, by, array.length - by);
191
192 return this;
193 }
194
195 @Override
196 public ArrayData ensure(final long safeIndex) {
197 if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) {
198 return new SparseArrayData(this, safeIndex + 1);
199 }
200 final int alen = array.length;
201 if (safeIndex >= alen) {
202 final int newLength = ArrayData.nextSize((int)safeIndex);
203 array = Arrays.copyOf(array, newLength);
204 }
205 if (safeIndex >= length()) {
206 setLength(safeIndex + 1);
207 }
208 return this;
209 }
210
211 @Override
212 public ArrayData shrink(final long newLength) {
213 Arrays.fill(array, (int)newLength, array.length, 0);
214 return this;
215 }
216
217 @Override
218 public ArrayData set(final int index, final Object value, final boolean strict) {
219 if (JSType.isRepresentableAsInt(value)) {
220 return set(index, JSType.toInt32(value), strict);
221 } else if (value == ScriptRuntime.UNDEFINED) {
222 return new UndefinedArrayFilter(this).set(index, value, strict);
223 }
224
225 final ArrayData newData = convert(value == null ? Object.class : value.getClass());
226 return newData.set(index, value, strict);
227 }
228
229 @Override
230 public ArrayData set(final int index, final int value, final boolean strict) {
231 array[index] = value;
232 setLength(Math.max(index + 1, length()));
233
234 return this;
235 }
236
237 @Override
238 public ArrayData set(final int index, final double value, final boolean strict) {
239 if (JSType.isRepresentableAsInt(value)) {
240 array[index] = (int)(long)value;
241 setLength(Math.max(index + 1, length()));
242 return this;
243 }
244
245 return convert(Double.class).set(index, value, strict);
246 }
247
248 @Override
249 public int getInt(final int index) {
250 return array[index];
251 }
252
253 @Override
254 public int getIntOptimistic(final int index, final int programPoint) {
255 return array[index];
256 }
257
258 @Override
259 public double getDouble(final int index) {
260 return array[index];
261 }
262
263 @Override
264 public double getDoubleOptimistic(final int index, final int programPoint) {
265 return array[index];
266 }
267
268 @Override
269 public Object getObject(final int index) {
270 return array[index];
271 }
272
273 @Override
274 public boolean has(final int index) {
275 return 0 <= index && index < length();
276 }
277
278 @Override
279 public ArrayData delete(final int index) {
280 return new DeletedRangeArrayFilter(this, index, index);
281 }
282
283 @Override
284 public ArrayData delete(final long fromIndex, final long toIndex) {
285 return new DeletedRangeArrayFilter(this, fromIndex, toIndex);
286 }
287
288 @Override
289 public Object pop() {
290 final int len = (int)length();
291 if (len == 0) {
292 return ScriptRuntime.UNDEFINED;
293 }
294
295 final int newLength = len - 1;
296 final int elem = array[newLength];
297 array[newLength] = 0;
298 setLength(newLength);
299
300 return elem;
301 }
302
303 @Override
304 public ArrayData slice(final long from, final long to) {
305 return new IntArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)(to - (from < 0 ? from + length() : from)));
306 }
307
308 @Override
309 public ArrayData fastSplice(final int start, final int removed, final int added) throws UnsupportedOperationException {
310 final long oldLength = length();
311 final long newLength = oldLength - removed + added;
312 if (newLength > SparseArrayData.MAX_DENSE_LENGTH && newLength > array.length) {
313 throw new UnsupportedOperationException();
314 }
315 final ArrayData returnValue = removed == 0 ?
316 EMPTY_ARRAY :
317 new IntArrayData(
318 Arrays.copyOfRange(
319 array,
320 start,
321 start + removed),
322 removed);
323
324 if (newLength != oldLength) {
325 final int[] newArray;
326
327 if (newLength > array.length) {
328 newArray = new int[ArrayData.nextSize((int)newLength)];
329 System.arraycopy(array, 0, newArray, 0, start);
330 } else {
331 newArray = array;
332 }
333
334 System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed));
335 array = newArray;
336 setLength(newLength);
337 }
338
339 return returnValue;
340 }
341
342 @Override
343 public double fastPush(final int arg) {
344 final int len = (int)length();
345 if (len == array.length) {
346 array = Arrays.copyOf(array, nextSize(len));
347 }
348 array[len] = arg;
349 return increaseLength();
350 }
351
352 //length must not be zero
353 @Override
354 public int fastPopInt() {
355 if (length() == 0) {
356 throw new ClassCastException(); //relink
357 }
358 final int newLength = (int)decreaseLength();
359 final int elem = array[newLength];
360 array[newLength] = 0;
361 return elem;
362 }
363
364 @Override
365 public double fastPopDouble() {
366 return fastPopInt();
367 }
368
369 @Override
370 public Object fastPopObject() {
371 return fastPopInt();
372 }
373
374 @Override
375 public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) {
376 final int otherLength = (int)otherData.length();
377 final int thisLength = (int)length();
378 assert otherLength > 0 && thisLength > 0;
379
380 final int[] otherArray = ((IntArrayData)otherData).array;
381 final int newLength = otherLength + thisLength;
382 final int[] newArray = new int[ArrayData.alignUp(newLength)];
383
384 System.arraycopy(array, 0, newArray, 0, thisLength);
385 System.arraycopy(otherArray, 0, newArray, thisLength, otherLength);
386
387 return new IntArrayData(newArray, newLength);
388 }
389
390 @Override
391 public String toString() {
392 assert length() <= array.length : length() + " > " + array.length;
393 return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length()));
394 }
395 }