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 long getLong(final int index) { 138 return getInt(index); 139 } 140 141 @Override 142 public long getLongOptimistic(final int index, final int programPoint) { 143 return getElem(index); 144 } 145 146 @Override 147 public double getDouble(final int index) { 148 return getInt(index); 149 } 150 151 @Override 152 public double getDoubleOptimistic(final int index, final int programPoint) { 153 return getElem(index); 154 } 155 156 @Override 157 public Object getObject(final int index) { 158 return getInt(index); 159 } 160 161 @Override 162 public ArrayData set(final int index, final Object value, final boolean strict) { 163 return set(index, JSType.toInt32(value), strict); 164 } 165 166 @Override 167 public ArrayData set(final int index, final int value, final boolean strict) { 168 setElem(index, value); 169 return this; 170 } 171 172 @Override 173 public ArrayData set(final int index, final long value, final boolean strict) { 174 return set(index, (int)value, strict); 175 } 176 177 @Override 178 public ArrayData set(final int index, final double value, final boolean strict) { 179 return set(index, (int)value, strict); 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 NativeInt16Array constructor(final boolean newObj, final Object self, final Object... args) { 194 return (NativeInt16Array)constructorImpl(newObj, args, FACTORY); 195 } 196 197 NativeInt16Array(final NativeArrayBuffer buffer, final int byteOffset, final int byteLength) { 198 super(buffer, byteOffset, byteLength); 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 NativeInt16Array subarray(final Object self, final Object begin, final Object end) { 240 return (NativeInt16Array)ArrayBufferView.subarrayImpl(self, begin, end); 241 } 242 243 @Override 244 protected ScriptObject getPrototype(final Global global) { 245 return global.getInt16ArrayPrototype(); 246 } 247 }