NativeUint32Array.java revision 953:221a84ef44c0
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.objects.annotations.Attribute; 36import jdk.nashorn.internal.objects.annotations.Constructor; 37import jdk.nashorn.internal.objects.annotations.Function; 38import jdk.nashorn.internal.objects.annotations.Property; 39import jdk.nashorn.internal.objects.annotations.ScriptClass; 40import jdk.nashorn.internal.objects.annotations.Where; 41import jdk.nashorn.internal.runtime.JSType; 42import jdk.nashorn.internal.runtime.PropertyMap; 43import jdk.nashorn.internal.runtime.ScriptObject; 44import jdk.nashorn.internal.runtime.arrays.ArrayData; 45import jdk.nashorn.internal.runtime.arrays.TypedArrayData; 46 47/** 48 * Uint32 array for TypedArray extension 49 */ 50@ScriptClass("Uint32Array") 51public final class NativeUint32Array extends ArrayBufferView { 52 /** 53 * The size in bytes of each element in the array. 54 */ 55 @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR) 56 public static final int BYTES_PER_ELEMENT = 4; 57 58 // initialized by nasgen 59 @SuppressWarnings("unused") 60 private static PropertyMap $nasgenmap$; 61 62 private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) { 63 @Override 64 public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteBegin, final int length) { 65 return new NativeUint32Array(buffer, byteBegin, length); 66 } 67 68 @Override 69 public Uint32ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) { 70 return new Uint32ArrayData(nb.order(ByteOrder.nativeOrder()).asIntBuffer(), start, end); 71 } 72 73 @Override 74 public String getClassName() { 75 return "Uint32Array"; 76 } 77 }; 78 79 private static final class Uint32ArrayData extends TypedArrayData<IntBuffer> { 80 81 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Uint32ArrayData.class, "getElem", long.class, int.class).methodHandle(); 82 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Uint32ArrayData.class, "setElem", void.class, int.class, int.class).methodHandle(); 83 84 private Uint32ArrayData(final IntBuffer nb, final int start, final int end) { 85 super(((IntBuffer)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 MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) { 100 if (returnType == int.class) { 101 return null; 102 } 103 return getContinuousElementGetter(getClass(), GET_ELEM, returnType, programPoint); 104 } 105 106 private long getElem(final int index) { 107 try { 108 return nb.get(index) & JSType.MAX_UINT; 109 } catch (final IndexOutOfBoundsException e) { 110 throw new ClassCastException(); //force relink - this works for unoptimistic too 111 } 112 } 113 114 private void setElem(final int index, final int elem) { 115 try { 116 nb.put(index, elem); 117 } catch (final IndexOutOfBoundsException e) { 118 //swallow valid array indexes. it's ok. 119 if (index < 0) { 120 throw new ClassCastException(); 121 } 122 } 123 } 124 125 @Override 126 public boolean isUnsigned() { 127 return true; 128 } 129 130 @Override 131 public int getInt(final int index) { 132 return (int)getLong(index); 133 } 134 135 @Override 136 public long getLong(final int index) { 137 return getElem(index); 138 } 139 140 @Override 141 public double getDouble(final int index) { 142 return getLong(index); 143 } 144 145 @Override 146 public Object getObject(final int index) { 147 return getLong(index); 148 } 149 150 @Override 151 public ArrayData set(final int index, final Object value, final boolean strict) { 152 return set(index, JSType.toInt32(value), strict); 153 } 154 155 @Override 156 public ArrayData set(final int index, final int value, final boolean strict) { 157 setElem(index, value); 158 return this; 159 } 160 161 @Override 162 public ArrayData set(final int index, final long value, final boolean strict) { 163 return set(index, (int)value, strict); 164 } 165 166 @Override 167 public ArrayData set(final int index, final double value, final boolean strict) { 168 return set(index, (int)value, strict); 169 } 170 } 171 172 /** 173 * Constructor 174 * 175 * @param newObj is this typed array instantiated with the new operator 176 * @param self self reference 177 * @param args args 178 * 179 * @return new typed array 180 */ 181 @Constructor(arity = 1) 182 public static NativeUint32Array constructor(final boolean newObj, final Object self, final Object... args) { 183 return (NativeUint32Array)constructorImpl(newObj, args, FACTORY); 184 } 185 186 NativeUint32Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) { 187 super(buffer, byteOffset, length); 188 } 189 190 @Override 191 protected Factory factory() { 192 return FACTORY; 193 } 194 195 /** 196 * Set values 197 * @param self self reference 198 * @param array multiple values of array's type to set 199 * @param offset optional start index, interpreted 0 if undefined 200 * @return undefined 201 */ 202 @Function(attributes = Attribute.NOT_ENUMERABLE) 203 protected static Object set(final Object self, final Object array, final Object offset) { 204 return ArrayBufferView.setImpl(self, array, offset); 205 } 206 207 /** 208 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray, 209 * referencing the elements at begin, inclusive, up to end, exclusive. If either 210 * begin or end is negative, it refers to an index from the end of the array, 211 * as opposed to from the beginning. 212 * <p> 213 * If end is unspecified, the subarray contains all elements from begin to the end 214 * of the TypedArray. The range specified by the begin and end values is clamped to 215 * the valid index range for the current array. If the computed length of the new 216 * TypedArray would be negative, it is clamped to zero. 217 * <p> 218 * The returned TypedArray will be of the same type as the array on which this 219 * method is invoked. 220 * 221 * @param self self reference 222 * @param begin begin position 223 * @param end end position 224 * 225 * @return sub array 226 */ 227 @Function(attributes = Attribute.NOT_ENUMERABLE) 228 protected static NativeUint32Array subarray(final Object self, final Object begin, final Object end) { 229 return (NativeUint32Array)ArrayBufferView.subarrayImpl(self, begin, end); 230 } 231 232 @Override 233 protected ScriptObject getPrototype(final Global global) { 234 return global.getUint32ArrayPrototype(); 235 } 236} 237