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.objects;
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.nio.ByteBuffer;
33 import java.nio.CharBuffer;
34 import jdk.nashorn.internal.objects.annotations.Attribute;
35 import jdk.nashorn.internal.objects.annotations.Constructor;
36 import jdk.nashorn.internal.objects.annotations.Function;
37 import jdk.nashorn.internal.objects.annotations.Property;
38 import jdk.nashorn.internal.objects.annotations.ScriptClass;
39 import jdk.nashorn.internal.objects.annotations.Where;
40 import jdk.nashorn.internal.runtime.JSType;
41 import jdk.nashorn.internal.runtime.PropertyMap;
42 import jdk.nashorn.internal.runtime.ScriptObject;
43 import jdk.nashorn.internal.runtime.arrays.ArrayData;
44 import jdk.nashorn.internal.runtime.arrays.TypedArrayData;
45
46 /**
47 * Uint16 array for TypedArray extension
48 */
49 @ScriptClass("Uint16Array")
50 public final class NativeUint16Array extends ArrayBufferView {
51 /**
52 * The size in bytes of each element in the array.
53 */
54 @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR)
55 public static final int BYTES_PER_ELEMENT = 2;
56
57 // initialized by nasgen
58 @SuppressWarnings("unused")
59 private static PropertyMap $nasgenmap$;
60
61 private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) {
62 @Override
63 public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
64 return new NativeUint16Array(buffer, byteOffset, length);
65 }
66
67 @Override
68 public Uint16ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) {
69 return new Uint16ArrayData(nb.asCharBuffer(), start, end);
70 }
71
72 @Override
73 public String getClassName() {
74 return "Uint16Array";
75 }
76 };
77
78 private static final class Uint16ArrayData extends TypedArrayData<CharBuffer> {
79
80 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Uint16ArrayData.class, "getElem", int.class, int.class).methodHandle();
81 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Uint16ArrayData.class, "setElem", void.class, int.class, int.class).methodHandle();
82
83 private Uint16ArrayData(final CharBuffer nb, final int start, final int end) {
84 super(((CharBuffer)nb.position(start).limit(end)).slice(), end - start);
85 }
86
87 @Override
88 protected MethodHandle getGetElem() {
89 return GET_ELEM;
90 }
91
92 @Override
93 protected MethodHandle getSetElem() {
94 return SET_ELEM;
95 }
96
97 private int getElem(final int index) {
98 try {
99 return nb.get(index);
100 } catch (final IndexOutOfBoundsException e) {
101 throw new ClassCastException(); //force relink - this works for unoptimistic too
102 }
103 }
104
105 private void setElem(final int index, final int elem) {
106 try {
107 if (index < nb.limit()) {
108 nb.put(index, (char) elem);
109 }
110 } catch (final IndexOutOfBoundsException e) {
111 throw new ClassCastException();
112 }
113 }
114
115 @Override
116 public boolean isUnsigned() {
117 return true;
118 }
119
120 @Override
121 public Class<?> getElementType() {
122 return int.class;
123 }
124
125 @Override
126 public Class<?> getBoxedElementType() {
127 return Integer.class;
128 }
129
130 @Override
131 public int getInt(final int index) {
132 return getElem(index);
133 }
134
135 @Override
136 public int getIntOptimistic(final int index, final int programPoint) {
137 return getElem(index);
138 }
139
140 @Override
141 public long getLong(final int index) {
142 return getInt(index);
143 }
144
145 @Override
146 public long getLongOptimistic(final int index, final int programPoint) {
147 return getElem(index);
148 }
149
150 @Override
151 public double getDouble(final int index) {
152 return getInt(index);
153 }
154
155 @Override
156 public double getDoubleOptimistic(final int index, final int programPoint) {
157 return getElem(index);
158 }
159
160 @Override
161 public Object getObject(final int index) {
162 return getInt(index);
163 }
164
165 @Override
166 public ArrayData set(final int index, final Object value, final boolean strict) {
167 return set(index, JSType.toInt32(value), strict);
168 }
169
170 @Override
171 public ArrayData set(final int index, final int value, final boolean strict) {
172 setElem(index, value);
173 return this;
174 }
175
176 @Override
177 public ArrayData set(final int index, final long value, final boolean strict) {
178 return set(index, (int)value, strict);
179 }
180
181 @Override
182 public ArrayData set(final int index, final double value, final boolean strict) {
183 return set(index, (int)value, strict);
184 }
185 }
186
187 /**
188 * Constructor
189 *
190 * @param newObj is this typed array instantiated with the new operator
191 * @param self self reference
192 * @param args args
193 *
194 * @return new typed array
195 */
196 @Constructor(arity = 1)
197 public static NativeUint16Array constructor(final boolean newObj, final Object self, final Object... args) {
198 return (NativeUint16Array)constructorImpl(newObj, args, FACTORY);
199 }
200
201 NativeUint16Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
202 super(buffer, byteOffset, length);
203 }
204
205 @Override
206 protected Factory factory() {
207 return FACTORY;
208 }
209
210 /**
211 * Set values
212 * @param self self reference
213 * @param array multiple values of array's type to set
214 * @param offset optional start index, interpreted 0 if undefined
215 * @return undefined
216 */
217 @Function(attributes = Attribute.NOT_ENUMERABLE)
218 protected static Object set(final Object self, final Object array, final Object offset) {
219 return ArrayBufferView.setImpl(self, array, offset);
220 }
221
222 /**
223 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
224 * referencing the elements at begin, inclusive, up to end, exclusive. If either
225 * begin or end is negative, it refers to an index from the end of the array,
226 * as opposed to from the beginning.
227 * <p>
228 * If end is unspecified, the subarray contains all elements from begin to the end
229 * of the TypedArray. The range specified by the begin and end values is clamped to
230 * the valid index range for the current array. If the computed length of the new
231 * TypedArray would be negative, it is clamped to zero.
232 * <p>
233 * The returned TypedArray will be of the same type as the array on which this
234 * method is invoked.
235 *
236 * @param self self reference
237 * @param begin begin position
238 * @param end end position
239 *
240 * @return sub array
241 */
242 @Function(attributes = Attribute.NOT_ENUMERABLE)
243 protected static NativeUint16Array subarray(final Object self, final Object begin, final Object end) {
244 return (NativeUint16Array)ArrayBufferView.subarrayImpl(self, begin, end);
245 }
246
247 @Override
248 protected ScriptObject getPrototype(final Global global) {
249 return global.getUint16ArrayPrototype();
250 }
251 }