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.ShortBuffer;
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 * Int16 array for the TypedArray extension
48 */
49 @ScriptClass("Int16Array")
50 public final class NativeInt16Array extends ArrayBufferView {
51
52 // initialized by nasgen
53 @SuppressWarnings("unused")
54 private static PropertyMap $nasgenmap$;
55
56 /**
57 * The size in bytes of each element in the array.
58 */
59 @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR)
60 public static final int BYTES_PER_ELEMENT = 2;
61
62 private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) {
63 @Override
64 public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
65 return new NativeInt16Array(buffer, byteOffset, length);
66 }
67
68 @Override
69 public Int16ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) {
70 return new Int16ArrayData(nb.asShortBuffer(), start, end);
71 }
72
73 @Override
74 public String getClassName() {
75 return "Int16Array";
76 }
77 };
78
79 private static final class Int16ArrayData extends TypedArrayData<ShortBuffer> {
80
81 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Int16ArrayData.class, "getElem", int.class, int.class).methodHandle();
82 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Int16ArrayData.class, "setElem", void.class, int.class, int.class).methodHandle();
83
84 private Int16ArrayData(final ShortBuffer nb, final int start, final int end) {
85 super(((ShortBuffer)nb.position(start).limit(end)).slice(), end - start);
86 }
87
88 @Override
89 protected MethodHandle getGetElem() {
90 return GET_ELEM;
91 }
92
93 @Override
94 protected MethodHandle getSetElem() {
95 return SET_ELEM;
96 }
97
98 @Override
99 public Class<?> getElementType() {
100 return int.class;
101 }
102
103 @Override
104 public Class<?> getBoxedElementType() {
105 return Integer.class;
106 }
107
108 private int getElem(final int index) {
109 try {
110 return nb.get(index);
111 } catch (final IndexOutOfBoundsException e) {
112 throw new ClassCastException(); //force relink - this works for unoptimistic too
113 }
114 }
115
116 private void setElem(final int index, final int elem) {
117 try {
118 if (index < nb.limit()) {
119 nb.put(index, (short) elem);
120 }
121 } catch (final IndexOutOfBoundsException e) {
122 throw new ClassCastException();
123 }
124 }
125
126 @Override
127 public int getInt(final int index) {
128 return getElem(index);
129 }
130
131 @Override
132 public int getIntOptimistic(final int index, final int programPoint) {
133 return getElem(index);
134 }
135
136 @Override
137 public double getDouble(final int index) {
138 return getInt(index);
139 }
140
141 @Override
142 public double getDoubleOptimistic(final int index, final int programPoint) {
143 return getElem(index);
144 }
145
146 @Override
147 public Object getObject(final int index) {
148 return getInt(index);
149 }
150
151 @Override
152 public ArrayData set(final int index, final Object value, final boolean strict) {
153 return set(index, JSType.toInt32(value), strict);
154 }
155
156 @Override
157 public ArrayData set(final int index, final int value, final boolean strict) {
158 setElem(index, value);
159 return this;
160 }
161
162 @Override
163 public ArrayData set(final int index, final double value, final boolean strict) {
164 return set(index, (int)value, strict);
165 }
166 }
167
168 /**
169 * Constructor
170 *
171 * @param newObj is this typed array instantiated with the new operator
172 * @param self self reference
173 * @param args args
174 *
175 * @return new typed array
176 */
177 @Constructor(arity = 1)
178 public static NativeInt16Array constructor(final boolean newObj, final Object self, final Object... args) {
179 return (NativeInt16Array)constructorImpl(newObj, args, FACTORY);
180 }
181
182 NativeInt16Array(final NativeArrayBuffer buffer, final int byteOffset, final int byteLength) {
183 super(buffer, byteOffset, byteLength);
184 }
185
186 @Override
187 protected Factory factory() {
188 return FACTORY;
189 }
190
191 /**
192 * Set values
193 * @param self self reference
194 * @param array multiple values of array's type to set
195 * @param offset optional start index, interpreted 0 if undefined
196 * @return undefined
197 */
198 @Function(attributes = Attribute.NOT_ENUMERABLE)
199 protected static Object set(final Object self, final Object array, final Object offset) {
200 return ArrayBufferView.setImpl(self, array, offset);
201 }
202
203 /**
204 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
205 * referencing the elements at begin, inclusive, up to end, exclusive. If either
206 * begin or end is negative, it refers to an index from the end of the array,
207 * as opposed to from the beginning.
208 * <p>
209 * If end is unspecified, the subarray contains all elements from begin to the end
210 * of the TypedArray. The range specified by the begin and end values is clamped to
211 * the valid index range for the current array. If the computed length of the new
212 * TypedArray would be negative, it is clamped to zero.
213 * <p>
214 * The returned TypedArray will be of the same type as the array on which this
215 * method is invoked.
216 *
217 * @param self self reference
218 * @param begin begin position
219 * @param end end position
220 *
221 * @return sub array
222 */
223 @Function(attributes = Attribute.NOT_ENUMERABLE)
224 protected static NativeInt16Array subarray(final Object self, final Object begin, final Object end) {
225 return (NativeInt16Array)ArrayBufferView.subarrayImpl(self, begin, end);
226 }
227
228 @Override
229 protected ScriptObject getPrototype(final Global global) {
230 return global.getInt16ArrayPrototype();
231 }
232 }