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 nb.put(index, (float)elem);
118 } catch (final IndexOutOfBoundsException e) {
119 //swallow valid array indexes. it's ok.
120 if (index < 0) {
121 throw new ClassCastException();
122 }
123 }
124 }
125
126 @Override
127 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
128 if (returnType == int.class || returnType == long.class) {
129 return null;
130 }
131 return getContinuousElementGetter(getClass(), GET_ELEM, returnType, programPoint);
132 }
133
134 @Override
135 public int getInt(final int index) {
136 return (int)getDouble(index);
137 }
138
139 @Override
140 public long getLong(final int index) {
141 return (long)getDouble(index);
142 }
143
144 @Override
145 public double getDouble(final int index) {
146 return getElem(index);
147 }
148
149 @Override
150 public double getDoubleOptimistic(final int index, final int programPoint) {
151 return getElem(index);
152 }
153
154 @Override
155 public Object getObject(final int index) {
156 return getDouble(index);
157 }
158
159 @Override
160 public ArrayData set(final int index, final Object value, final boolean strict) {
161 return set(index, JSType.toNumber(value), strict);
162 }
163
164 @Override
165 public ArrayData set(final int index, final int value, final boolean strict) {
166 return set(index, (double)value, strict);
167 }
168
169 @Override
170 public ArrayData set(final int index, final long value, final boolean strict) {
171 return set(index, (double)value, strict);
172 }
173
174 @Override
175 public ArrayData set(final int index, final double value, final boolean strict) {
176 setElem(index, value);
177 return this;
178 }
179 }
180
181 /**
182 * Constructor
183 *
184 * @param newObj is this typed array instantiated with the new operator
185 * @param self self reference
186 * @param args args
187 *
188 * @return new typed array
189 */
190 @Constructor(arity = 1)
191 public static NativeFloat32Array constructor(final boolean newObj, final Object self, final Object... args) {
192 return (NativeFloat32Array)constructorImpl(newObj, args, FACTORY);
193 }
194
195 NativeFloat32Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) {
196 super(buffer, byteOffset, length);
197 }
198
199 @Override
200 protected Factory factory() {
201 return FACTORY;
202 }
203
204 @Override
205 protected boolean isFloatArray() {
206 return true;
207 }
208
209 /**
210 * Set values
211 * @param self self reference
212 * @param array multiple values of array's type to set
213 * @param offset optional start index, interpreted 0 if undefined
214 * @return undefined
215 */
216 @Function(attributes = Attribute.NOT_ENUMERABLE)
217 protected static Object set(final Object self, final Object array, final Object offset) {
218 return ArrayBufferView.setImpl(self, array, offset);
219 }
220
221 /**
222 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray,
223 * referencing the elements at begin, inclusive, up to end, exclusive. If either
224 * begin or end is negative, it refers to an index from the end of the array,
225 * as opposed to from the beginning.
226 * <p>
227 * If end is unspecified, the subarray contains all elements from begin to the end
228 * of the TypedArray. The range specified by the begin and end values is clamped to
229 * the valid index range for the current array. If the computed length of the new
230 * TypedArray would be negative, it is clamped to zero.
231 * <p>
232 * The returned TypedArray will be of the same type as the array on which this
233 * method is invoked.
234 *
235 * @param self self reference
236 * @param begin begin position
237 * @param end end position
238 *
239 * @return sub array
240 */
241 @Function(attributes = Attribute.NOT_ENUMERABLE)
242 protected static NativeFloat32Array subarray(final Object self, final Object begin, final Object end) {
243 return (NativeFloat32Array)ArrayBufferView.subarrayImpl(self, begin, end);
244 }
245
246 @Override
247 protected ScriptObject getPrototype(final Global global) {
248 return global.getFloat32ArrayPrototype();
249 }
250 }