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 jdk.nashorn.internal.objects.annotations.Attribute;
34 import jdk.nashorn.internal.objects.annotations.Constructor;
35 import jdk.nashorn.internal.objects.annotations.Function;
36 import jdk.nashorn.internal.objects.annotations.Property;
37 import jdk.nashorn.internal.objects.annotations.ScriptClass;
38 import jdk.nashorn.internal.objects.annotations.Where;
39 import jdk.nashorn.internal.runtime.JSType;
40 import jdk.nashorn.internal.runtime.PropertyMap;
41 import jdk.nashorn.internal.runtime.ScriptObject;
42 import jdk.nashorn.internal.runtime.arrays.ArrayData;
43 import jdk.nashorn.internal.runtime.arrays.TypedArrayData;
44
45 /**
46 * Int8Array for the TypedArray extension
47 */
48 @ScriptClass("Int8Array")
49 public final class NativeInt8Array extends ArrayBufferView {
50 /**
51 * The size in bytes of each element in the array.
52 */
53 @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR)
54 public static final int BYTES_PER_ELEMENT = 1;
55
56 // initialized by nasgen
57 @SuppressWarnings("unused")
58 private static PropertyMap $nasgenmap$;
59
60 private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) {
61 @Override
62 public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
63 return new NativeInt8Array(buffer, byteOffset, length);
64 }
65
66 @Override
67 public Int8ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) {
68 return new Int8ArrayData(nb, start, end);
69 }
70
71 @Override
72 public String getClassName() {
73 return "Int8Array";
74 }
75 };
76
77 private static final class Int8ArrayData extends TypedArrayData<ByteBuffer> {
78
79 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Int8ArrayData.class, "getElem", int.class, int.class).methodHandle();
80 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Int8ArrayData.class, "setElem", void.class, int.class, int.class).methodHandle();
81
82 private Int8ArrayData(final ByteBuffer nb, final int start, final int end) {
83 super(((ByteBuffer)nb.position(start).limit(end)).slice(), end - start);
84 }
85
86 @Override
87 protected MethodHandle getGetElem() {
88 return GET_ELEM;
89 }
90
91 @Override
92 protected MethodHandle getSetElem() {
93 return SET_ELEM;
94 }
95
96 @Override
97 public Class<?> getElementType() {
98 return int.class;
99 }
100
101 @Override
102 public Class<?> getBoxedElementType() {
103 return Integer.class;
104 }
105
106 private int getElem(final int index) {
107 try {
108 return nb.get(index);
109 } catch (final IndexOutOfBoundsException e) {
110 throw new ClassCastException(); //force relink - this works for unoptimistic too
111 }
112 }
113
114 private void setElem(final int index, final int elem) {
115 try {
116 if (index < nb.limit()) {
117 nb.put(index, (byte) elem);
118 }
119 } catch (final IndexOutOfBoundsException e) {
120 throw new ClassCastException();
121 }
122 }
123
124 @Override
125 public int getInt(final int index) {
126 return getElem(index);
127 }
128
129 @Override
130 public int getIntOptimistic(final int index, final int programPoint) {
131 return getElem(index);
132 }
133
134 @Override
135 public double getDouble(final int index) {
136 return getInt(index);
137 }
138
139 @Override
140 public double getDoubleOptimistic(final int index, final int programPoint) {
141 return getElem(index);
142 }
143
144 @Override
145 public Object getObject(final int index) {
146 return getInt(index);
147 }
148
149 @Override
150 public ArrayData set(final int index, final Object value, final boolean strict) {
151 return set(index, JSType.toInt32(value), strict);
152 }
153
154 @Override
155 public ArrayData set(final int index, final int value, final boolean strict) {
156 setElem(index, value);
157 return this;
158 }
159
160 @Override
161 public ArrayData set(final int index, final double value, final boolean strict) {
162 return set(index, (int)value, strict);
163 }
164 }
165
166
167 /**
168 * Constructor
169 *
170 * @param newObj is this typed array instantiated with the new operator
171 * @param self self reference
172 * @param args args
173 *
174 * @return new typed array
175 */
176 @Constructor(arity = 1)
177 public static NativeInt8Array constructor(final boolean newObj, final Object self, final Object... args) {
178 return (NativeInt8Array)constructorImpl(newObj, args, FACTORY);
179 }
180
181 NativeInt8Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
182 super(buffer, byteOffset, length);
183 }
184
185 @Override
186 protected Factory factory() {
187 return FACTORY;
188 }
189
190 /**
191 * Set values
192 * @param self self reference
193 * @param array multiple values of array's type to set
194 * @param offset optional start index, interpreted 0 if undefined
195 * @return undefined
196 */
197 @Function(attributes = Attribute.NOT_ENUMERABLE)
198 protected static Object set(final Object self, final Object array, final Object offset) {
199 return ArrayBufferView.setImpl(self, array, offset);
200 }
201
202 /**
203 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
204 * referencing the elements at begin, inclusive, up to end, exclusive. If either
205 * begin or end is negative, it refers to an index from the end of the array,
206 * as opposed to from the beginning.
207 * <p>
208 * If end is unspecified, the subarray contains all elements from begin to the end
209 * of the TypedArray. The range specified by the begin and end values is clamped to
210 * the valid index range for the current array. If the computed length of the new
211 * TypedArray would be negative, it is clamped to zero.
212 * <p>
213 * The returned TypedArray will be of the same type as the array on which this
214 * method is invoked.
215 *
216 * @param self self reference
217 * @param begin begin position
218 * @param end end position
219 *
220 * @return sub array
221 */
222 @Function(attributes = Attribute.NOT_ENUMERABLE)
223 protected static NativeInt8Array subarray(final Object self, final Object begin, final Object end) {
224 return (NativeInt8Array)ArrayBufferView.subarrayImpl(self, begin, end);
225 }
226
227 @Override
228 protected ScriptObject getPrototype(final Global global) {
229 return global.getInt8ArrayPrototype();
230 }
231 }