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 nb.put(index, (byte)elem);
117 } catch (final IndexOutOfBoundsException e) {
118 //swallow valid array indexes. it's ok.
119 if (index < 0) {
120 throw new ClassCastException();
121 }
122 }
123 }
124
125 @Override
126 public int getInt(final int index) {
127 return getElem(index);
128 }
129
130 @Override
131 public int getIntOptimistic(final int index, final int programPoint) {
132 return getElem(index);
133 }
134
135 @Override
136 public long getLong(final int index) {
137 return getInt(index);
138 }
139
140 @Override
141 public long getLongOptimistic(final int index, final int programPoint) {
142 return getElem(index);
143 }
144
145 @Override
146 public double getDouble(final int index) {
147 return getInt(index);
148 }
149
150 @Override
151 public double getDoubleOptimistic(final int index, final int programPoint) {
152 return getElem(index);
153 }
154
155 @Override
156 public Object getObject(final int index) {
157 return getInt(index);
158 }
159
160 @Override
161 public ArrayData set(final int index, final Object value, final boolean strict) {
162 return set(index, JSType.toInt32(value), strict);
163 }
164
165 @Override
166 public ArrayData set(final int index, final int value, final boolean strict) {
167 setElem(index, value);
168 return this;
169 }
170
171 @Override
172 public ArrayData set(final int index, final long value, final boolean strict) {
173 return set(index, (int)value, strict);
174 }
175
176 @Override
177 public ArrayData set(final int index, final double value, final boolean strict) {
178 return set(index, (int)value, strict);
179 }
180 }
181
182
183 /**
184 * Constructor
185 *
186 * @param newObj is this typed array instantiated with the new operator
187 * @param self self reference
188 * @param args args
189 *
190 * @return new typed array
191 */
192 @Constructor(arity = 1)
193 public static NativeInt8Array constructor(final boolean newObj, final Object self, final Object... args) {
194 return (NativeInt8Array)constructorImpl(newObj, args, FACTORY);
195 }
196
197 NativeInt8Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
198 super(buffer, byteOffset, length);
199 }
200
201 @Override
202 protected Factory factory() {
203 return FACTORY;
204 }
205
206 /**
207 * Set values
208 * @param self self reference
209 * @param array multiple values of array's type to set
210 * @param offset optional start index, interpreted 0 if undefined
211 * @return undefined
212 */
213 @Function(attributes = Attribute.NOT_ENUMERABLE)
214 protected static Object set(final Object self, final Object array, final Object offset) {
215 return ArrayBufferView.setImpl(self, array, offset);
216 }
217
218 /**
219 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
220 * referencing the elements at begin, inclusive, up to end, exclusive. If either
221 * begin or end is negative, it refers to an index from the end of the array,
222 * as opposed to from the beginning.
223 * <p>
224 * If end is unspecified, the subarray contains all elements from begin to the end
225 * of the TypedArray. The range specified by the begin and end values is clamped to
226 * the valid index range for the current array. If the computed length of the new
227 * TypedArray would be negative, it is clamped to zero.
228 * <p>
229 * The returned TypedArray will be of the same type as the array on which this
230 * method is invoked.
231 *
232 * @param self self reference
233 * @param begin begin position
234 * @param end end position
235 *
236 * @return sub array
237 */
238 @Function(attributes = Attribute.NOT_ENUMERABLE)
239 protected static NativeInt8Array subarray(final Object self, final Object begin, final Object end) {
240 return (NativeInt8Array)ArrayBufferView.subarrayImpl(self, begin, end);
241 }
242
243 @Override
244 protected ScriptObject getPrototype(final Global global) {
245 return global.getInt8ArrayPrototype();
246 }
247 }