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.FloatBuffer;
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 * Float32 array for the TypedArray extension
48 */
49 @ScriptClass("Float32Array")
50 public final class NativeFloat32Array 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 = 4;
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 NativeFloat32Array(buffer, byteOffset, length);
65 }
66
67 @Override
68 public Float32ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) {
69 return new Float32ArrayData(nb.asFloatBuffer(), start, end);
70 }
71
72 @Override
73 public String getClassName() {
74 return "Float32Array";
75 }
76 };
77
78 private static final class Float32ArrayData extends TypedArrayData<FloatBuffer> {
79
80 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Float32ArrayData.class, "getElem", double.class, int.class).methodHandle();
81 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Float32ArrayData.class, "setElem", void.class, int.class, double.class).methodHandle();
82
83 private Float32ArrayData(final FloatBuffer nb, final int start, final int end) {
84 super(((FloatBuffer)nb.position(start).limit(end)).slice(), end - start);
85 }
86
87 @Override
88 public Class<?> getElementType() {
89 return double.class;
90 }
91
92 @Override
93 public Class<?> getBoxedElementType() {
94 return Double.class;
95 }
96
97 @Override
98 protected MethodHandle getGetElem() {
99 return GET_ELEM;
100 }
101
102 @Override
103 protected MethodHandle getSetElem() {
104 return SET_ELEM;
105 }
106
107 private double getElem(final int index) {
108 try {
109 return nb.get(index);
110 } catch (final IndexOutOfBoundsException e) {
111 throw new ClassCastException(); //force relink - this works for unoptimistic too
112 }
113 }
114
115 private void setElem(final int index, final double elem) {
116 try {
117 if (index < nb.limit()) {
118 nb.put(index, (float) elem);
119 }
120 } catch (final IndexOutOfBoundsException e) {
121 throw new ClassCastException();
122 }
123 }
124
125 @Override
126 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
127 if (returnType == int.class) {
128 return null;
129 }
130 return getContinuousElementGetter(getClass(), GET_ELEM, returnType, programPoint);
131 }
132
133 @Override
134 public int getInt(final int index) {
135 return (int)getDouble(index);
136 }
137
138 @Override
139 public double getDouble(final int index) {
140 return getElem(index);
141 }
142
143 @Override
144 public double getDoubleOptimistic(final int index, final int programPoint) {
145 return getElem(index);
146 }
147
148 @Override
149 public Object getObject(final int index) {
150 return getDouble(index);
151 }
152
153 @Override
154 public ArrayData set(final int index, final Object value, final boolean strict) {
155 return set(index, JSType.toNumber(value), strict);
156 }
157
158 @Override
159 public ArrayData set(final int index, final int value, final boolean strict) {
160 return set(index, (double)value, strict);
161 }
162
163 @Override
164 public ArrayData set(final int index, final double value, final boolean strict) {
165 setElem(index, value);
166 return this;
167 }
168 }
169
170 /**
171 * Constructor
172 *
173 * @param newObj is this typed array instantiated with the new operator
174 * @param self self reference
175 * @param args args
176 *
177 * @return new typed array
178 */
179 @Constructor(arity = 1)
180 public static NativeFloat32Array constructor(final boolean newObj, final Object self, final Object... args) {
181 return (NativeFloat32Array)constructorImpl(newObj, args, FACTORY);
182 }
183
184 NativeFloat32Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
185 super(buffer, byteOffset, length);
186 }
187
188 @Override
189 protected Factory factory() {
190 return FACTORY;
191 }
192
193 @Override
194 protected boolean isFloatArray() {
195 return true;
196 }
197
198 /**
199 * Set values
200 * @param self self reference
201 * @param array multiple values of array's type to set
202 * @param offset optional start index, interpreted 0 if undefined
203 * @return undefined
204 */
205 @Function(attributes = Attribute.NOT_ENUMERABLE)
206 protected static Object set(final Object self, final Object array, final Object offset) {
207 return ArrayBufferView.setImpl(self, array, offset);
208 }
209
210 /**
211 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
212 * referencing the elements at begin, inclusive, up to end, exclusive. If either
213 * begin or end is negative, it refers to an index from the end of the array,
214 * as opposed to from the beginning.
215 * <p>
216 * If end is unspecified, the subarray contains all elements from begin to the end
217 * of the TypedArray. The range specified by the begin and end values is clamped to
218 * the valid index range for the current array. If the computed length of the new
219 * TypedArray would be negative, it is clamped to zero.
220 * <p>
221 * The returned TypedArray will be of the same type as the array on which this
222 * method is invoked.
223 *
224 * @param self self reference
225 * @param begin begin position
226 * @param end end position
227 *
228 * @return sub array
229 */
230 @Function(attributes = Attribute.NOT_ENUMERABLE)
231 protected static NativeFloat32Array subarray(final Object self, final Object begin, final Object end) {
232 return (NativeFloat32Array)ArrayBufferView.subarrayImpl(self, begin, end);
233 }
234
235 @Override
236 protected ScriptObject getPrototype(final Global global) {
237 return global.getFloat32ArrayPrototype();
238 }
239 }
--- EOF ---