NativeUint32Array.java revision 1801:1272bfe44562
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 26package jdk.nashorn.internal.objects; 27 28import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall; 29 30import java.lang.invoke.MethodHandle; 31import java.lang.invoke.MethodHandles; 32import java.nio.ByteBuffer; 33import java.nio.ByteOrder; 34import java.nio.IntBuffer; 35import jdk.nashorn.internal.codegen.types.Type; 36import jdk.nashorn.internal.objects.annotations.Attribute; 37import jdk.nashorn.internal.objects.annotations.Constructor; 38import jdk.nashorn.internal.objects.annotations.Function; 39import jdk.nashorn.internal.objects.annotations.Property; 40import jdk.nashorn.internal.objects.annotations.ScriptClass; 41import jdk.nashorn.internal.objects.annotations.Where; 42import jdk.nashorn.internal.runtime.JSType; 43import jdk.nashorn.internal.runtime.PropertyMap; 44import jdk.nashorn.internal.runtime.ScriptObject; 45import jdk.nashorn.internal.runtime.UnwarrantedOptimismException; 46import jdk.nashorn.internal.runtime.arrays.ArrayData; 47import jdk.nashorn.internal.runtime.arrays.TypedArrayData; 48 49/** 50 * Uint32 array for TypedArray extension 51 */ 52@ScriptClass("Uint32Array") 53public final class NativeUint32Array extends ArrayBufferView { 54 /** 55 * The size in bytes of each element in the array. 56 */ 57 @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR) 58 public static final int BYTES_PER_ELEMENT = 4; 59 60 // initialized by nasgen 61 @SuppressWarnings("unused") 62 private static PropertyMap $nasgenmap$; 63 64 private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) { 65 @Override 66 public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteBegin, final int length) { 67 return new NativeUint32Array(buffer, byteBegin, length); 68 } 69 70 @Override 71 public Uint32ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) { 72 return new Uint32ArrayData(nb.order(ByteOrder.nativeOrder()).asIntBuffer(), start, end); 73 } 74 75 @Override 76 public String getClassName() { 77 return "Uint32Array"; 78 } 79 }; 80 81 private static final class Uint32ArrayData extends TypedArrayData<IntBuffer> { 82 83 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Uint32ArrayData.class, "getElem", double.class, int.class).methodHandle(); 84 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Uint32ArrayData.class, "setElem", void.class, int.class, int.class).methodHandle(); 85 86 private Uint32ArrayData(final IntBuffer nb, final int start, final int end) { 87 super((nb.position(start).limit(end)).slice(), end - start); 88 } 89 90 @Override 91 protected MethodHandle getGetElem() { 92 return GET_ELEM; 93 } 94 95 @Override 96 protected MethodHandle getSetElem() { 97 return SET_ELEM; 98 } 99 100 @Override 101 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) { 102 if (returnType == int.class) { 103 return null; 104 } 105 return getContinuousElementGetter(getClass(), GET_ELEM, returnType, programPoint); 106 } 107 108 private int getRawElem(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 double getElem(final int index) { 117 return JSType.toUint32(getRawElem(index)); 118 } 119 120 private void setElem(final int index, final int elem) { 121 try { 122 if (index < nb.limit()) { 123 nb.put(index, elem); 124 } 125 } catch (final IndexOutOfBoundsException e) { 126 throw new ClassCastException(); 127 } 128 } 129 130 @Override 131 public boolean isUnsigned() { 132 return true; 133 } 134 135 @Override 136 public Class<?> getElementType() { 137 return double.class; 138 } 139 140 @Override 141 public Class<?> getBoxedElementType() { 142 return Double.class; 143 } 144 145 @Override 146 public int getInt(final int index) { 147 return getRawElem(index); 148 } 149 150 @Override 151 public int getIntOptimistic(final int index, final int programPoint) { 152 return JSType.toUint32Optimistic(getRawElem(index), programPoint); 153 } 154 155 @Override 156 public double getDouble(final int index) { 157 return getElem(index); 158 } 159 160 @Override 161 public double getDoubleOptimistic(final int index, final int programPoint) { 162 return getElem(index); 163 } 164 165 @Override 166 public Object getObject(final int index) { 167 return getElem(index); 168 } 169 170 @Override 171 public ArrayData set(final int index, final Object value, final boolean strict) { 172 return set(index, JSType.toInt32(value), strict); 173 } 174 175 @Override 176 public ArrayData set(final int index, final int value, final boolean strict) { 177 setElem(index, value); 178 return this; 179 } 180 181 @Override 182 public ArrayData set(final int index, final double value, final boolean strict) { 183 return set(index, (int)value, strict); 184 } 185 } 186 187 /** 188 * Constructor 189 * 190 * @param newObj is this typed array instantiated with the new operator 191 * @param self self reference 192 * @param args args 193 * 194 * @return new typed array 195 */ 196 @Constructor(arity = 1) 197 public static NativeUint32Array constructor(final boolean newObj, final Object self, final Object... args) { 198 return (NativeUint32Array)constructorImpl(newObj, args, FACTORY); 199 } 200 201 NativeUint32Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) { 202 super(buffer, byteOffset, length); 203 } 204 205 @Override 206 protected Factory factory() { 207 return FACTORY; 208 } 209 210 /** 211 * Set values 212 * @param self self reference 213 * @param array multiple values of array's type to set 214 * @param offset optional start index, interpreted 0 if undefined 215 * @return undefined 216 */ 217 @Function(attributes = Attribute.NOT_ENUMERABLE) 218 protected static Object set(final Object self, final Object array, final Object offset) { 219 return ArrayBufferView.setImpl(self, array, offset); 220 } 221 222 /** 223 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray, 224 * referencing the elements at begin, inclusive, up to end, exclusive. If either 225 * begin or end is negative, it refers to an index from the end of the array, 226 * as opposed to from the beginning. 227 * <p> 228 * If end is unspecified, the subarray contains all elements from begin to the end 229 * of the TypedArray. The range specified by the begin and end values is clamped to 230 * the valid index range for the current array. If the computed length of the new 231 * TypedArray would be negative, it is clamped to zero. 232 * <p> 233 * The returned TypedArray will be of the same type as the array on which this 234 * method is invoked. 235 * 236 * @param self self reference 237 * @param begin begin position 238 * @param end end position 239 * 240 * @return sub array 241 */ 242 @Function(attributes = Attribute.NOT_ENUMERABLE) 243 protected static NativeUint32Array subarray(final Object self, final Object begin, final Object end) { 244 return (NativeUint32Array)ArrayBufferView.subarrayImpl(self, begin, end); 245 } 246 247 /** 248 * ECMA 6 22.2.3.30 %TypedArray%.prototype [ @@iterator ] ( ) 249 * 250 * @param self the self reference 251 * @return an iterator over the array's values 252 */ 253 @Function(attributes = Attribute.NOT_ENUMERABLE, name = "@@iterator") 254 public static Object getIterator(final Object self) { 255 return ArrayIterator.newArrayValueIterator(self); 256 } 257 258 @Override 259 protected ScriptObject getPrototype(final Global global) { 260 return global.getUint32ArrayPrototype(); 261 } 262} 263