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 ArrayData shiftLeft(final int by) {
125 if (by >= length()) {
126 shrink(0);
127 } else {
128 System.arraycopy(array, by, array, 0, array.length - by);
129 }
130 setLength(Math.max(0, length() - by));
131 return this;
132 }
133
134 @Override
135 public ArrayData shiftRight(final int by) {
136 final ArrayData newData = ensure(by + length() - 1);
137 if (newData != this) {
138 newData.shiftRight(by);
139 return newData;
140 }
141 System.arraycopy(array, 0, array, by, array.length - by);
142 return this;
143 }
144
145 @Override
146 public ArrayData ensure(final long safeIndex) {
147 if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) {
148 return new SparseArrayData(this, safeIndex + 1);
149 }
150 final int alen = array.length;
151 if (safeIndex >= alen) {
152 final int newLength = ArrayData.nextSize((int)safeIndex);
153 array = Arrays.copyOf(array, newLength); //todo fill with nan or never accessed?
154 }
155 if (safeIndex >= length()) {
156 setLength(safeIndex + 1);
157 }
158 return this;
159
160 }
161
162 @Override
163 public ArrayData shrink(final long newLength) {
164 Arrays.fill(array, (int)newLength, array.length, 0.0);
165 return this;
166 }
167
168 @Override
169 public ArrayData set(final int index, final Object value, final boolean strict) {
170 if (value instanceof Double || (value != null && canWiden(value.getClass()))) {
171 return set(index, ((Number)value).doubleValue(), strict);
172 } else if (value == UNDEFINED) {
173 return new UndefinedArrayFilter(this).set(index, value, strict);
174 }
175
176 final ArrayData newData = convert(value == null ? Object.class : value.getClass());
177 return newData.set(index, value, strict);
178 }
179
180 @Override
181 public ArrayData set(final int index, final int value, final boolean strict) {
182 array[index] = value;
183 setLength(Math.max(index + 1, length()));
184 return this;
185 }
186
187 @Override
188 public ArrayData set(final int index, final double value, final boolean strict) {
189 array[index] = value;
190 setLength(Math.max(index + 1, length()));
191 return this;
192 }
193
194 private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), NumberArrayData.class, "getElem", double.class, int.class).methodHandle();
195 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), NumberArrayData.class, "setElem", void.class, int.class, double.class).methodHandle();
196
197 @SuppressWarnings("unused")
198 private double getElem(final int index) {
199 if (has(index)) {
200 return array[index];
201 }
202 throw new ClassCastException();
203 }
204
205 @SuppressWarnings("unused")
206 private void setElem(final int index, final double elem) {
207 if (hasRoomFor(index)) {
208 array[index] = elem;
209 return;
210 }
211 throw new ClassCastException();
212 }
213
214 @Override
215 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
216 if (returnType == int.class) {
217 return null;
218 }
219 return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint);
220 }
221
222 @Override
223 public MethodHandle getElementSetter(final Class<?> elementType) {
224 return elementType.isPrimitive() ? getContinuousElementSetter(MH.asType(SET_ELEM, SET_ELEM.type().changeParameterType(2, elementType)), elementType) : null;
225 }
226
227 @Override
228 public int getInt(final int index) {
229 return JSType.toInt32(array[index]);
230 }
231
232 @Override
233 public double getDouble(final int index) {
234 return array[index];
235 }
236
237 @Override
238 public double getDoubleOptimistic(final int index, final int programPoint) {
239 return array[index];
240 }
241
242 @Override
243 public Object getObject(final int index) {
244 return array[index];
245 }
246
247 @Override
248 public boolean has(final int index) {
249 return 0 <= index && index < length();
250 }
251
252 @Override
253 public ArrayData delete(final int index) {
254 return new DeletedRangeArrayFilter(this, index, index);
255 }
256
257 @Override
258 public ArrayData delete(final long fromIndex, final long toIndex) {
259 return new DeletedRangeArrayFilter(this, fromIndex, toIndex);
260 }
261
262 @Override
263 public Object pop() {
264 final int len = (int)length();
265 if (len == 0) {
266 return UNDEFINED;
267 }
268
269 final int newLength = len - 1;
270 final double elem = array[newLength];
271 array[newLength] = 0;
272 setLength(newLength);
273 return elem;
274 }
275
276 @Override
277 public ArrayData slice(final long from, final long to) {
278 final long start = from < 0 ? from + length() : from;
279 final long newLength = to - start;
280 return new NumberArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)newLength);
281 }
282
283 @Override
284 public ArrayData fastSplice(final int start, final int removed, final int added) throws UnsupportedOperationException {
285 final long oldLength = length();
286 final long newLength = oldLength - removed + added;
287 if (newLength > SparseArrayData.MAX_DENSE_LENGTH && newLength > array.length) {
288 throw new UnsupportedOperationException();
289 }
290 final ArrayData returnValue = removed == 0 ?
291 EMPTY_ARRAY : new NumberArrayData(Arrays.copyOfRange(array, start, start + removed), removed);
292
293 if (newLength != oldLength) {
294 final double[] newArray;
295
296 if (newLength > array.length) {
297 newArray = new double[ArrayData.nextSize((int)newLength)];
298 System.arraycopy(array, 0, newArray, 0, start);
299 } else {
300 newArray = array;
301 }
302
303 System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed));
304 array = newArray;
305 setLength(newLength);
306 }
307
308 return returnValue;
309 }
310
311 @Override
312 public double fastPush(final int arg) {
313 return fastPush((double)arg);
314 }
315
316 @Override
317 public double fastPush(final long arg) {
318 return fastPush((double)arg);
319 }
320
321 @Override
322 public double fastPush(final double arg) {
323 final int len = (int)length();
324 if (len == array.length) {
325 //note that fastpush never creates spares arrays, there is nothing to gain by that - it will just use even more memory
326 array = Arrays.copyOf(array, nextSize(len));
327 }
328 array[len] = arg;
329 return increaseLength();
330 }
331
332 @Override
333 public double fastPopDouble() {
334 if (length() == 0) {
335 throw new ClassCastException();
336 }
337 final int newLength = (int)decreaseLength();
338 final double elem = array[newLength];
339 array[newLength] = 0;
340 return elem;
341 }
342
343 @Override
344 public Object fastPopObject() {
345 return fastPopDouble();
346 }
347
348 @Override
349 public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) {
350 final int otherLength = (int)otherData.length();
351 final int thisLength = (int)length();
352 assert otherLength > 0 && thisLength > 0;
353
354 final double[] otherArray = ((NumberArrayData)otherData).array;
355 final int newLength = otherLength + thisLength;
356 final double[] newArray = new double[ArrayData.alignUp(newLength)];
357
358 System.arraycopy(array, 0, newArray, 0, thisLength);
359 System.arraycopy(otherArray, 0, newArray, thisLength, otherLength);
360
361 return new NumberArrayData(newArray, newLength);
362 }
363
364 @Override
365 public String toString() {
366 assert length() <= array.length : length() + " > " + array.length;
367 return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length()));
368 }
369 }