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 ArrayData shiftLeft(final int by) {
180 if (by >= length()) {
181 shrink(0);
182 } else {
183 System.arraycopy(array, by, array, 0, array.length - by);
184 }
185 setLength(Math.max(0, length() - by));
186
187 return this;
188 }
189
190 @Override
191 public ArrayData shiftRight(final int by) {
192 final ArrayData newData = ensure(by + length() - 1);
193 if (newData != this) {
194 newData.shiftRight(by);
195 return newData;
196 }
197 System.arraycopy(array, 0, array, by, array.length - by);
198
199 return this;
200 }
201
202 @Override
203 public ArrayData ensure(final long safeIndex) {
204 if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) {
205 return new SparseArrayData(this, safeIndex + 1);
206 }
207 final int alen = array.length;
208 if (safeIndex >= alen) {
209 final int newLength = ArrayData.nextSize((int)safeIndex);
210 array = Arrays.copyOf(array, newLength);
211 }
212 if (safeIndex >= length()) {
213 setLength(safeIndex + 1);
214 }
215 return this;
216 }
217
218 @Override
219 public ArrayData shrink(final long newLength) {
220 Arrays.fill(array, (int)newLength, array.length, 0);
221 return this;
222 }
223
224 @Override
225 public ArrayData set(final int index, final Object value, final boolean strict) {
226 if (JSType.isRepresentableAsInt(value)) {
227 return set(index, JSType.toInt32(value), strict);
228 } else if (value == ScriptRuntime.UNDEFINED) {
229 return new UndefinedArrayFilter(this).set(index, value, strict);
230 }
231
232 final ArrayData newData = convert(value == null ? Object.class : value.getClass());
233 return newData.set(index, value, strict);
234 }
235
236 @Override
237 public ArrayData set(final int index, final int value, final boolean strict) {
238 array[index] = value;
239 setLength(Math.max(index + 1, length()));
240
241 return this;
242 }
243
244 @Override
245 public ArrayData set(final int index, final double value, final boolean strict) {
246 if (JSType.isRepresentableAsInt(value)) {
247 array[index] = (int)(long)value;
248 setLength(Math.max(index + 1, length()));
249 return this;
250 }
251
252 return convert(Double.class).set(index, value, strict);
253 }
254
255 @Override
256 public int getInt(final int index) {
257 return array[index];
258 }
259
260 @Override
261 public int getIntOptimistic(final int index, final int programPoint) {
262 return array[index];
263 }
264
265 @Override
266 public double getDouble(final int index) {
267 return array[index];
268 }
269
270 @Override
271 public double getDoubleOptimistic(final int index, final int programPoint) {
272 return array[index];
273 }
274
275 @Override
276 public Object getObject(final int index) {
277 return array[index];
278 }
279
280 @Override
281 public boolean has(final int index) {
282 return 0 <= index && index < length();
283 }
284
285 @Override
286 public ArrayData delete(final int index) {
287 return new DeletedRangeArrayFilter(this, index, index);
288 }
289
290 @Override
291 public ArrayData delete(final long fromIndex, final long toIndex) {
292 return new DeletedRangeArrayFilter(this, fromIndex, toIndex);
293 }
294
295 @Override
296 public Object pop() {
297 final int len = (int)length();
298 if (len == 0) {
299 return ScriptRuntime.UNDEFINED;
300 }
301
302 final int newLength = len - 1;
303 final int elem = array[newLength];
304 array[newLength] = 0;
305 setLength(newLength);
306
307 return elem;
308 }
309
310 @Override
311 public ArrayData slice(final long from, final long to) {
312 return new IntArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)(to - (from < 0 ? from + length() : from)));
313 }
314
315 @Override
316 public ArrayData fastSplice(final int start, final int removed, final int added) throws UnsupportedOperationException {
317 final long oldLength = length();
318 final long newLength = oldLength - removed + added;
319 if (newLength > SparseArrayData.MAX_DENSE_LENGTH && newLength > array.length) {
320 throw new UnsupportedOperationException();
321 }
322 final ArrayData returnValue = removed == 0 ?
323 EMPTY_ARRAY :
324 new IntArrayData(
325 Arrays.copyOfRange(
326 array,
327 start,
328 start + removed),
329 removed);
330
331 if (newLength != oldLength) {
332 final int[] newArray;
333
334 if (newLength > array.length) {
335 newArray = new int[ArrayData.nextSize((int)newLength)];
336 System.arraycopy(array, 0, newArray, 0, start);
337 } else {
338 newArray = array;
339 }
340
341 System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed));
342 array = newArray;
343 setLength(newLength);
344 }
345
346 return returnValue;
347 }
348
349 @Override
350 public double fastPush(final int arg) {
351 final int len = (int)length();
352 if (len == array.length) {
353 array = Arrays.copyOf(array, nextSize(len));
354 }
355 array[len] = arg;
356 return increaseLength();
357 }
358
359 //length must not be zero
360 @Override
361 public int fastPopInt() {
362 if (length() == 0) {
363 throw new ClassCastException(); //relink
364 }
365 final int newLength = (int)decreaseLength();
366 final int elem = array[newLength];
367 array[newLength] = 0;
368 return elem;
369 }
370
371 @Override
372 public double fastPopDouble() {
373 return fastPopInt();
374 }
375
376 @Override
377 public Object fastPopObject() {
378 return fastPopInt();
379 }
380
381 @Override
382 public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) {
383 final int otherLength = (int)otherData.length();
384 final int thisLength = (int)length();
385 assert otherLength > 0 && thisLength > 0;
386
387 final int[] otherArray = ((IntArrayData)otherData).array;
388 final int newLength = otherLength + thisLength;
389 final int[] newArray = new int[ArrayData.alignUp(newLength)];
390
391 System.arraycopy(array, 0, newArray, 0, thisLength);
392 System.arraycopy(otherArray, 0, newArray, thisLength, otherLength);
393
394 return new IntArrayData(newArray, newLength);
395 }
396
397 @Override
398 public String toString() {
399 assert length() <= array.length : length() + " > " + array.length;
400 return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length()));
401 }
402 }