NativeUint32Array.java revision 1036:f0b5e3900a10
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; 29import java.lang.invoke.MethodHandle; 30import java.lang.invoke.MethodHandles; 31import java.nio.ByteBuffer; 32import java.nio.ByteOrder; 33import java.nio.IntBuffer; 34import jdk.nashorn.internal.objects.annotations.Attribute; 35import jdk.nashorn.internal.objects.annotations.Constructor; 36import jdk.nashorn.internal.objects.annotations.Function; 37import jdk.nashorn.internal.objects.annotations.Property; 38import jdk.nashorn.internal.objects.annotations.ScriptClass; 39import jdk.nashorn.internal.objects.annotations.Where; 40import jdk.nashorn.internal.runtime.JSType; 41import jdk.nashorn.internal.runtime.PropertyMap; 42import jdk.nashorn.internal.runtime.ScriptObject; 43import jdk.nashorn.internal.runtime.arrays.ArrayData; 44import jdk.nashorn.internal.runtime.arrays.TypedArrayData; 45 46/** 47 * Uint32 array for TypedArray extension 48 */ 49@ScriptClass("Uint32Array") 50public final class NativeUint32Array 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 byteBegin, final int length) { 64 return new NativeUint32Array(buffer, byteBegin, length); 65 } 66 67 @Override 68 public Uint32ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) { 69 return new Uint32ArrayData(nb.order(ByteOrder.nativeOrder()).asIntBuffer(), start, end); 70 } 71 72 @Override 73 public String getClassName() { 74 return "Uint32Array"; 75 } 76 }; 77 78 private static final class Uint32ArrayData extends TypedArrayData<IntBuffer> { 79 80 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Uint32ArrayData.class, "getElem", long.class, int.class).methodHandle(); 81 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Uint32ArrayData.class, "setElem", void.class, int.class, int.class).methodHandle(); 82 83 private Uint32ArrayData(final IntBuffer nb, final int start, final int end) { 84 super(((IntBuffer)nb.position(start).limit(end)).slice(), end - start); 85 } 86 87 @Override 88 protected MethodHandle getGetElem() { 89 return GET_ELEM; 90 } 91 92 @Override 93 protected MethodHandle getSetElem() { 94 return SET_ELEM; 95 } 96 97 @Override 98 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) { 99 if (returnType == int.class) { 100 return null; 101 } 102 return getContinuousElementGetter(getClass(), GET_ELEM, returnType, programPoint); 103 } 104 105 private long getElem(final int index) { 106 try { 107 return nb.get(index) & JSType.MAX_UINT; 108 } catch (final IndexOutOfBoundsException e) { 109 throw new ClassCastException(); //force relink - this works for unoptimistic too 110 } 111 } 112 113 private void setElem(final int index, final int elem) { 114 try { 115 nb.put(index, elem); 116 } catch (final IndexOutOfBoundsException e) { 117 //swallow valid array indexes. it's ok. 118 if (index < 0) { 119 throw new ClassCastException(); 120 } 121 } 122 } 123 124 @Override 125 public boolean isUnsigned() { 126 return true; 127 } 128 129 @Override 130 public Class<?> getElementType() { 131 return int.class; 132 } 133 134 @Override 135 public int getInt(final int index) { 136 return (int)getLong(index); 137 } 138 139 @Override 140 public long getLong(final int index) { 141 return getElem(index); 142 } 143 144 @Override 145 public double getDouble(final int index) { 146 return getLong(index); 147 } 148 149 @Override 150 public Object getObject(final int index) { 151 return getLong(index); 152 } 153 154 @Override 155 public ArrayData set(final int index, final Object value, final boolean strict) { 156 return set(index, JSType.toInt32(value), strict); 157 } 158 159 @Override 160 public ArrayData set(final int index, final int value, final boolean strict) { 161 setElem(index, value); 162 return this; 163 } 164 165 @Override 166 public ArrayData set(final int index, final long value, final boolean strict) { 167 return set(index, (int)value, strict); 168 } 169 170 @Override 171 public ArrayData set(final int index, final double value, final boolean strict) { 172 return set(index, (int)value, strict); 173 } 174 } 175 176 /** 177 * Constructor 178 * 179 * @param newObj is this typed array instantiated with the new operator 180 * @param self self reference 181 * @param args args 182 * 183 * @return new typed array 184 */ 185 @Constructor(arity = 1) 186 public static NativeUint32Array constructor(final boolean newObj, final Object self, final Object... args) { 187 return (NativeUint32Array)constructorImpl(newObj, args, FACTORY); 188 } 189 190 NativeUint32Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) { 191 super(buffer, byteOffset, length); 192 } 193 194 @Override 195 protected Factory factory() { 196 return FACTORY; 197 } 198 199 /** 200 * Set values 201 * @param self self reference 202 * @param array multiple values of array's type to set 203 * @param offset optional start index, interpreted 0 if undefined 204 * @return undefined 205 */ 206 @Function(attributes = Attribute.NOT_ENUMERABLE) 207 protected static Object set(final Object self, final Object array, final Object offset) { 208 return ArrayBufferView.setImpl(self, array, offset); 209 } 210 211 /** 212 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray, 213 * referencing the elements at begin, inclusive, up to end, exclusive. If either 214 * begin or end is negative, it refers to an index from the end of the array, 215 * as opposed to from the beginning. 216 * <p> 217 * If end is unspecified, the subarray contains all elements from begin to the end 218 * of the TypedArray. The range specified by the begin and end values is clamped to 219 * the valid index range for the current array. If the computed length of the new 220 * TypedArray would be negative, it is clamped to zero. 221 * <p> 222 * The returned TypedArray will be of the same type as the array on which this 223 * method is invoked. 224 * 225 * @param self self reference 226 * @param begin begin position 227 * @param end end position 228 * 229 * @return sub array 230 */ 231 @Function(attributes = Attribute.NOT_ENUMERABLE) 232 protected static NativeUint32Array subarray(final Object self, final Object begin, final Object end) { 233 return (NativeUint32Array)ArrayBufferView.subarrayImpl(self, begin, end); 234 } 235 236 @Override 237 protected ScriptObject getPrototype(final Global global) { 238 return global.getUint32ArrayPrototype(); 239 } 240} 241