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 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
31
32 import java.lang.invoke.MethodHandle;
33 import java.lang.invoke.MethodHandles;
34 import java.util.Arrays;
35 import jdk.dynalink.linker.support.TypeUtilities;
36 import jdk.nashorn.internal.runtime.JSType;
37
38 /**
39 * Implementation of {@link ArrayData} as soon as a double has been
40 * written to the array
41 */
42 final class NumberArrayData extends ContinuousArrayData implements NumericElements {
43 /**
44 * The wrapped array
45 */
46 private double[] array;
47
48 /**
49 * Constructor
50 * @param array an int array
51 * @param length a length, not necessarily array.length
52 */
53 NumberArrayData(final double[] array, final int length) {
54 super(length);
55 assert array.length >= length;
56 this.array = array;
57 }
58
59 @Override
60 public final Class<?> getElementType() {
61 return double.class;
62 }
63
64 @Override
65 public final Class<?> getBoxedElementType() {
66 return Double.class;
67 }
68
69 @Override
70 public final int getElementWeight() {
71 return 3;
72 }
73
74 @Override
75 public final ContinuousArrayData widest(final ContinuousArrayData otherData) {
76 return otherData instanceof IntOrLongElements ? this : otherData;
77 }
78
79 @Override
80 public NumberArrayData copy() {
81 return new NumberArrayData(array.clone(), (int)length());
82 }
83
84 @Override
85 public Object[] asObjectArray() {
86 return toObjectArray(true);
87 }
88
89 private Object[] toObjectArray(final boolean trim) {
90 assert length() <= array.length : "length exceeds internal array size";
91 final int len = (int)length();
92 final Object[] oarray = new Object[trim ? len : array.length];
93
94 for (int index = 0; index < len; index++) {
95 oarray[index] = array[index];
96 }
97 return oarray;
98 }
99
100 @Override
101 public Object asArrayOfType(final Class<?> componentType) {
102 if (componentType == double.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 static boolean canWiden(final Class<?> type) {
110 return TypeUtilities.isWrapperType(type) &&
111 type != Boolean.class && type != Character.class;
112 }
113
114 @Override
115 public ContinuousArrayData convert(final Class<?> type) {
116 if (! canWiden(type)) {
117 final int len = (int)length();
118 return new ObjectArrayData(toObjectArray(false), len);
119 }
120 return this;
121 }
122
123 @Override
124 public void shiftLeft(final int by) {
125 System.arraycopy(array, by, array, 0, array.length - by);
126 }
127
128 @Override
129 public ArrayData shiftRight(final int by) {
130 final ArrayData newData = ensure(by + length() - 1);
131 if (newData != this) {
132 newData.shiftRight(by);
133 return newData;
134 }
135 System.arraycopy(array, 0, array, by, array.length - by);
136 return this;
137 }
138
139 @Override
140 public ArrayData ensure(final long safeIndex) {
141 if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) {
142 return new SparseArrayData(this, safeIndex + 1);
143 }
144 final int alen = array.length;
145 if (safeIndex >= alen) {
146 final int newLength = ArrayData.nextSize((int)safeIndex);
147 array = Arrays.copyOf(array, newLength); //todo fill with nan or never accessed?
148 }
149 if (safeIndex >= length()) {
150 setLength(safeIndex + 1);
151 }
152 return this;
153
154 }
155
156 @Override
157 public ArrayData shrink(final long newLength) {
158 Arrays.fill(array, (int)newLength, array.length, 0.0);
159 return this;
160 }
161
162 @Override
163 public ArrayData set(final int index, final Object value, final boolean strict) {
164 if (value instanceof Double || (value != null && canWiden(value.getClass()))) {
165 return set(index, ((Number)value).doubleValue(), strict);
166 } else if (value == UNDEFINED) {
167 return new UndefinedArrayFilter(this).set(index, value, strict);
168 }
169
170 final ArrayData newData = convert(value == null ? Object.class : value.getClass());
171 return newData.set(index, value, strict);
172 }
173
174 @Override
175 public ArrayData set(final int index, final int value, final boolean strict) {
176 array[index] = value;
177 setLength(Math.max(index + 1, length()));
178 return this;
179 }
180
181 @Override
182 public ArrayData set(final int index, final double value, final boolean strict) {
183 array[index] = value;
184 setLength(Math.max(index + 1, length()));
185 return this;
186 }
187
188 private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), NumberArrayData.class, "getElem", double.class, int.class).methodHandle();
189 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), NumberArrayData.class, "setElem", void.class, int.class, double.class).methodHandle();
190
191 @SuppressWarnings("unused")
192 private double getElem(final int index) {
193 if (has(index)) {
194 return array[index];
195 }
196 throw new ClassCastException();
197 }
198
199 @SuppressWarnings("unused")
200 private void setElem(final int index, final double elem) {
201 if (hasRoomFor(index)) {
202 array[index] = elem;
203 return;
204 }
205 throw new ClassCastException();
206 }
207
208 @Override
209 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
210 if (returnType == int.class) {
211 return null;
212 }
213 return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint);
214 }
215
216 @Override
217 public MethodHandle getElementSetter(final Class<?> elementType) {
218 return elementType.isPrimitive() ? getContinuousElementSetter(MH.asType(SET_ELEM, SET_ELEM.type().changeParameterType(2, elementType)), elementType) : null;
219 }
220
221 @Override
222 public int getInt(final int index) {
223 return JSType.toInt32(array[index]);
224 }
225
226 @Override
227 public double getDouble(final int index) {
228 return array[index];
229 }
230
231 @Override
232 public double getDoubleOptimistic(final int index, final int programPoint) {
233 return array[index];
234 }
235
236 @Override
237 public Object getObject(final int index) {
238 return array[index];
239 }
240
241 @Override
242 public boolean has(final int index) {
243 return 0 <= index && index < length();
244 }
245
246 @Override
247 public ArrayData delete(final int index) {
248 return new DeletedRangeArrayFilter(this, index, index);
249 }
250
251 @Override
252 public ArrayData delete(final long fromIndex, final long toIndex) {
253 return new DeletedRangeArrayFilter(this, fromIndex, toIndex);
254 }
255
256 @Override
257 public Object pop() {
258 final int len = (int)length();
259 if (len == 0) {
260 return UNDEFINED;
261 }
262
263 final int newLength = len - 1;
264 final double elem = array[newLength];
265 array[newLength] = 0;
266 setLength(newLength);
267 return elem;
268 }
269
270 @Override
271 public ArrayData slice(final long from, final long to) {
272 final long start = from < 0 ? from + length() : from;
273 final long newLength = to - start;
274 return new NumberArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)newLength);
275 }
276
277 @Override
278 public ArrayData fastSplice(final int start, final int removed, final int added) throws UnsupportedOperationException {
279 final long oldLength = length();
280 final long newLength = oldLength - removed + added;
281 if (newLength > SparseArrayData.MAX_DENSE_LENGTH && newLength > array.length) {
282 throw new UnsupportedOperationException();
283 }
284 final ArrayData returnValue = removed == 0 ?
285 EMPTY_ARRAY : new NumberArrayData(Arrays.copyOfRange(array, start, start + removed), removed);
286
287 if (newLength != oldLength) {
288 final double[] newArray;
289
290 if (newLength > array.length) {
291 newArray = new double[ArrayData.nextSize((int)newLength)];
292 System.arraycopy(array, 0, newArray, 0, start);
293 } else {
294 newArray = array;
295 }
296
297 System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed));
298 array = newArray;
299 setLength(newLength);
300 }
301
302 return returnValue;
303 }
304
305 @Override
306 public long fastPush(final int arg) {
307 return fastPush((double)arg);
308 }
309
310 @Override
311 public long fastPush(final long arg) {
312 return fastPush((double)arg);
313 }
314
315 @Override
316 public long fastPush(final double arg) {
317 final int len = (int)length();
318 if (len == array.length) {
319 //note that fastpush never creates spares arrays, there is nothing to gain by that - it will just use even more memory
320 array = Arrays.copyOf(array, nextSize(len));
321 }
322 array[len] = arg;
323 return increaseLength();
324 }
325
326 @Override
327 public double fastPopDouble() {
328 if (length() == 0) {
329 throw new ClassCastException();
330 }
331 final int newLength = (int)decreaseLength();
332 final double elem = array[newLength];
333 array[newLength] = 0;
334 return elem;
335 }
336
337 @Override
338 public Object fastPopObject() {
339 return fastPopDouble();
340 }
341
342 @Override
343 public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) {
344 final int otherLength = (int)otherData.length();
345 final int thisLength = (int)length();
346 assert otherLength > 0 && thisLength > 0;
347
348 final double[] otherArray = ((NumberArrayData)otherData).array;
349 final int newLength = otherLength + thisLength;
350 final double[] newArray = new double[ArrayData.alignUp(newLength)];
351
352 System.arraycopy(array, 0, newArray, 0, thisLength);
353 System.arraycopy(otherArray, 0, newArray, thisLength, otherLength);
354
355 return new NumberArrayData(newArray, newLength);
356 }
357
358 @Override
359 public String toString() {
360 assert length() <= array.length : length() + " > " + array.length;
361 return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length()));
362 }
363 }