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 static jdk.nashorn.internal.lookup.Lookup.MH;
30
31 import java.lang.invoke.MethodHandle;
32 import java.lang.invoke.MethodHandles;
33 import java.util.Arrays;
34 import jdk.nashorn.internal.runtime.JSType;
35 import jdk.nashorn.internal.runtime.ScriptRuntime;
36
37 /**
38 * Implementation of {@link ArrayData} as soon as a long has been
39 * written to the array
40 */
41 final class LongArrayData extends ContinuousArrayData implements IntOrLongElements {
42 /**
43 * The wrapped array
44 */
45 private long[] array;
46
47 /**
48 * Constructor
49 * @param array an int array
50 * @param length a length, not necessarily array.length
51 */
52 LongArrayData(final long array[], final int length) {
53 super(length);
54 assert array.length >= length;
55 this.array = array;
56 }
57
58 @Override
59 public final Class<?> getElementType() {
60 return long.class;
61 }
62
63 @Override
64 public final Class<?> getBoxedElementType() {
65 return Long.class;
66 }
67
68 @Override
69 public final ContinuousArrayData widest(final ContinuousArrayData otherData) {
70 return otherData instanceof IntElements ? this : otherData;
71 }
72
73 @Override
74 public final int getElementWeight() {
75 return 2;
76 }
77
78 @Override
79 public LongArrayData copy() {
80 return new LongArrayData(array.clone(), (int)length());
81 }
82
83 @Override
84 public Object[] asObjectArray() {
85 return toObjectArray(true);
86 }
87
88 private Object[] toObjectArray(final boolean trim) {
89 assert length() <= array.length : "length exceeds internal array size";
90 final int len = (int)length();
91 final Object[] oarray = new Object[trim ? len : array.length];
92
93 for (int index = 0; index < len; index++) {
94 oarray[index] = Long.valueOf(array[index]);
95 }
96
97 return oarray;
98 }
99
100 @Override
101 public Object asArrayOfType(final Class<?> componentType) {
102 if (componentType == long.class) {
103 final int len = (int)length();
104 return array.length == len ? array.clone() : Arrays.copyOf(array, len);
105 }
106 return super.asArrayOfType(componentType);
107 }
108
109 private double[] toDoubleArray() {
110 assert length() <= array.length : "length exceeds internal array size";
111 final int len = (int)length();
112 final double[] darray = new double[array.length];
113
114 for (int index = 0; index < len; index++) {
115 darray[index] = array[index];
116 }
117
118 return darray;
119 }
120
121 @Override
122 public ContinuousArrayData convert(final Class<?> type) {
123 if (type == Integer.class || type == Long.class) {
124 return this;
125 }
126 final int len = (int)length();
127 if (type == Double.class) {
128 return new NumberArrayData(toDoubleArray(), len);
129 }
130 return new ObjectArrayData(toObjectArray(false), len);
131 }
132
133 @Override
134 public void shiftLeft(final int by) {
135 System.arraycopy(array, by, array, 0, array.length - by);
136 }
137
138 @Override
139 public ArrayData shiftRight(final int by) {
140 final ArrayData newData = ensure(by + length() - 1);
141 if (newData != this) {
142 newData.shiftRight(by);
143 return newData;
144 }
145 System.arraycopy(array, 0, array, by, array.length - by);
146
147 return this;
148 }
149
150 @Override
151 public ArrayData ensure(final long safeIndex) {
152 if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) {
153 return new SparseArrayData(this, safeIndex + 1);
154 }
155 final int alen = array.length;
156 if (safeIndex >= alen) {
157 final int newLength = ArrayData.nextSize((int)safeIndex);
158 array = Arrays.copyOf(array, newLength);
159 }
160 if (safeIndex >= length()) {
161 setLength(safeIndex + 1);
162 }
163 return this;
164 }
165
166 @Override
167 public ArrayData shrink(final long newLength) {
168 Arrays.fill(array, (int)newLength, array.length, 0L);
169 return this;
170 }
171
172 @Override
173 public ArrayData set(final int index, final Object value, final boolean strict) {
174 if (value instanceof Long || value instanceof Integer) {
175 return set(index, ((Number)value).longValue(), strict);
176 } else if (value == ScriptRuntime.UNDEFINED) {
177 return new UndefinedArrayFilter(this).set(index, value, strict);
178 }
179
180 final ArrayData newData = convert(value == null ? Object.class : value.getClass());
181 return newData.set(index, value, strict);
182 }
183
184 @Override
185 public ArrayData set(final int index, final int value, final boolean strict) {
186 array[index] = value;
187 setLength(Math.max(index + 1, length()));
188 return this;
189 }
190
191 @Override
192 public ArrayData set(final int index, final long value, final boolean strict) {
193 array[index] = value;
194 setLength(Math.max(index + 1, length()));
195 return this;
196 }
197
198 @Override
199 public ArrayData set(final int index, final double value, final boolean strict) {
200 if (JSType.isRepresentableAsLong(value)) {
201 array[index] = (long)value;
202 setLength(Math.max(index + 1, length()));
203 return this;
204 }
205 return convert(Double.class).set(index, value, strict);
206 }
207
208 private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), LongArrayData.class, "getElem", long.class, int.class).methodHandle();
209 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), LongArrayData.class, "setElem", void.class, int.class, long.class).methodHandle();
210
211 @SuppressWarnings("unused")
212 private long getElem(final int index) {
213 if (has(index)) {
214 return array[index];
215 }
216 throw new ClassCastException();
217 }
218
219 @SuppressWarnings("unused")
220 private void setElem(final int index, final long elem) {
221 if (hasRoomFor(index)) {
222 array[index] = elem;
223 return;
224 }
225 throw new ClassCastException();
226 }
227
228 @Override
229 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
230 if (returnType == int.class) {
231 return null;
232 }
233 return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint);
234 }
235
236 @Override
237 public MethodHandle getElementSetter(final Class<?> elementType) {
238 return elementType == int.class || elementType == long.class ? getContinuousElementSetter(MH.asType(SET_ELEM, SET_ELEM.type().changeParameterType(2, elementType)), elementType) : null;
239 }
240
241 @Override
242 public int getInt(final int index) {
243 return (int)array[index];
244 }
245
246 @Override
247 public long getLong(final int index) {
248 return array[index];
249 }
250
251 @Override
252 public long getLongOptimistic(final int index, final int programPoint) {
253 return array[index];
254 }
255
256 @Override
257 public double getDouble(final int index) {
258 return array[index];
259 }
260
261 @Override
262 public double getDoubleOptimistic(final int index, final int programPoint) {
263 return array[index];
264 }
265
266 @Override
267 public Object getObject(final int index) {
268 return array[index];
269 }
270
271 @Override
272 public boolean has(final int index) {
273 return 0 <= index && index < length();
274 }
275
276 @Override
277 public ArrayData delete(final int index) {
278 return new DeletedRangeArrayFilter(this, index, index);
279 }
280
281 @Override
282 public ArrayData delete(final long fromIndex, final long toIndex) {
283 return new DeletedRangeArrayFilter(this, fromIndex, toIndex);
284 }
285
286 @Override
287 public Object pop() {
288 final int len = (int)length();
289 if (len == 0) {
290 return ScriptRuntime.UNDEFINED;
291 }
292
293 final int newLength = len - 1;
294 final long elem = array[newLength];
295 array[newLength] = 0;
296 setLength(newLength);
297
298 return elem;
299 }
300
301 @Override
302 public ArrayData slice(final long from, final long to) {
303 final long start = from < 0 ? from + length() : from;
304 final long newLength = to - start;
305 return new LongArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)newLength);
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 : new LongArrayData(Arrays.copyOfRange(array, start, start + removed), removed);
317
318 if (newLength != oldLength) {
319 final long[] newArray;
320
321 if (newLength > array.length) {
322 newArray = new long[ArrayData.nextSize((int)newLength)];
323 System.arraycopy(array, 0, newArray, 0, start);
324 } else {
325 newArray = array;
326 }
327
328 System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed));
329 array = newArray;
330 setLength(newLength);
331 }
332
333 return returnValue;
334 }
335
336 @Override
337 public long fastPush(final int arg) {
338 return fastPush((long)arg);
339 }
340
341 @Override
342 public long fastPush(final long arg) {
343 final int len = (int)length();
344 if (len == array.length) {
345 array = Arrays.copyOf(array, nextSize(len));
346 }
347 array[len] = arg;
348 return increaseLength();
349 }
350
351 @Override
352 public long fastPopLong() {
353 if (length() == 0) {
354 throw new ClassCastException(); //undefined result
355 }
356 final int newLength = (int)decreaseLength();
357 final long elem = array[newLength];
358 array[newLength] = 0;
359 return elem;
360 }
361
362 @Override
363 public double fastPopDouble() {
364 return fastPopLong();
365 }
366
367 @Override
368 public Object fastPopObject() {
369 return fastPopLong();
370 }
371
372 @Override
373 public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) {
374 final int otherLength = (int)otherData.length();
375 final int thisLength = (int)length();
376 assert otherLength > 0 && thisLength > 0;
377
378 final long[] otherArray = ((LongArrayData)otherData).array;
379 final int newLength = otherLength + thisLength;
380 final long[] newArray = new long[ArrayData.alignUp(newLength)];
381
382 System.arraycopy(array, 0, newArray, 0, thisLength);
383 System.arraycopy(otherArray, 0, newArray, thisLength, otherLength);
384
385 return new LongArrayData(newArray, newLength);
386 }
387
388 @Override
389 public String toString() {
390 assert length() <= array.length : length() + " > " + array.length;
391
392 final StringBuilder sb = new StringBuilder(getClass().getSimpleName()).
393 append(": [");
394 final int len = (int)length();
395 for (int i = 0; i < len; i++) {
396 sb.append(array[i]).append('L'); //make sure L suffix is on elements, to discriminate this from IntArrayData.toString()
397 if (i + 1 < len) {
398 sb.append(", ");
399 }
400 }
401 sb.append(']');
402
403 return sb.toString();
404 }
405 }