NativeInt8Array.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 jdk.nashorn.internal.objects.annotations.Attribute; 33import jdk.nashorn.internal.objects.annotations.Constructor; 34import jdk.nashorn.internal.objects.annotations.Function; 35import jdk.nashorn.internal.objects.annotations.Property; 36import jdk.nashorn.internal.objects.annotations.ScriptClass; 37import jdk.nashorn.internal.objects.annotations.Where; 38import jdk.nashorn.internal.runtime.JSType; 39import jdk.nashorn.internal.runtime.PropertyMap; 40import jdk.nashorn.internal.runtime.ScriptObject; 41import jdk.nashorn.internal.runtime.arrays.ArrayData; 42import jdk.nashorn.internal.runtime.arrays.TypedArrayData; 43 44/** 45 * Int8Array for the TypedArray extension 46 */ 47@ScriptClass("Int8Array") 48public final class NativeInt8Array extends ArrayBufferView { 49 /** 50 * The size in bytes of each element in the array. 51 */ 52 @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR) 53 public static final int BYTES_PER_ELEMENT = 1; 54 55 // initialized by nasgen 56 @SuppressWarnings("unused") 57 private static PropertyMap $nasgenmap$; 58 59 private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) { 60 @Override 61 public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) { 62 return new NativeInt8Array(buffer, byteOffset, length); 63 } 64 65 @Override 66 public Int8ArrayData createArrayData(final ByteBuffer nb, final int start, final int end) { 67 return new Int8ArrayData(nb, start, end); 68 } 69 70 @Override 71 public String getClassName() { 72 return "Int8Array"; 73 } 74 }; 75 76 private static final class Int8ArrayData extends TypedArrayData<ByteBuffer> { 77 78 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Int8ArrayData.class, "getElem", int.class, int.class).methodHandle(); 79 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Int8ArrayData.class, "setElem", void.class, int.class, int.class).methodHandle(); 80 81 private Int8ArrayData(final ByteBuffer nb, final int start, final int end) { 82 super(((ByteBuffer)nb.position(start).limit(end)).slice(), end - start); 83 } 84 85 @Override 86 protected MethodHandle getGetElem() { 87 return GET_ELEM; 88 } 89 90 @Override 91 protected MethodHandle getSetElem() { 92 return SET_ELEM; 93 } 94 95 @Override 96 public Class<?> getElementType() { 97 return int.class; 98 } 99 100 private int getElem(final int index) { 101 try { 102 return nb.get(index); 103 } catch (final IndexOutOfBoundsException e) { 104 throw new ClassCastException(); //force relink - this works for unoptimistic too 105 } 106 } 107 108 private void setElem(final int index, final int elem) { 109 try { 110 nb.put(index, (byte)elem); 111 } catch (final IndexOutOfBoundsException e) { 112 //swallow valid array indexes. it's ok. 113 if (index < 0) { 114 throw new ClassCastException(); 115 } 116 } 117 } 118 119 @Override 120 public int getInt(final int index) { 121 return getElem(index); 122 } 123 124 @Override 125 public long getLong(final int index) { 126 return getInt(index); 127 } 128 129 @Override 130 public double getDouble(final int index) { 131 return getInt(index); 132 } 133 134 @Override 135 public Object getObject(final int index) { 136 return getInt(index); 137 } 138 139 @Override 140 public ArrayData set(final int index, final Object value, final boolean strict) { 141 return set(index, JSType.toInt32(value), strict); 142 } 143 144 @Override 145 public ArrayData set(final int index, final int value, final boolean strict) { 146 setElem(index, value); 147 return this; 148 } 149 150 @Override 151 public ArrayData set(final int index, final long value, final boolean strict) { 152 return set(index, (int)value, strict); 153 } 154 155 @Override 156 public ArrayData set(final int index, final double value, final boolean strict) { 157 return set(index, (int)value, strict); 158 } 159 } 160 161 162 /** 163 * Constructor 164 * 165 * @param newObj is this typed array instantiated with the new operator 166 * @param self self reference 167 * @param args args 168 * 169 * @return new typed array 170 */ 171 @Constructor(arity = 1) 172 public static NativeInt8Array constructor(final boolean newObj, final Object self, final Object... args) { 173 return (NativeInt8Array)constructorImpl(newObj, args, FACTORY); 174 } 175 176 NativeInt8Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) { 177 super(buffer, byteOffset, length); 178 } 179 180 @Override 181 protected Factory factory() { 182 return FACTORY; 183 } 184 185 /** 186 * Set values 187 * @param self self reference 188 * @param array multiple values of array's type to set 189 * @param offset optional start index, interpreted 0 if undefined 190 * @return undefined 191 */ 192 @Function(attributes = Attribute.NOT_ENUMERABLE) 193 protected static Object set(final Object self, final Object array, final Object offset) { 194 return ArrayBufferView.setImpl(self, array, offset); 195 } 196 197 /** 198 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray, 199 * referencing the elements at begin, inclusive, up to end, exclusive. If either 200 * begin or end is negative, it refers to an index from the end of the array, 201 * as opposed to from the beginning. 202 * <p> 203 * If end is unspecified, the subarray contains all elements from begin to the end 204 * of the TypedArray. The range specified by the begin and end values is clamped to 205 * the valid index range for the current array. If the computed length of the new 206 * TypedArray would be negative, it is clamped to zero. 207 * <p> 208 * The returned TypedArray will be of the same type as the array on which this 209 * method is invoked. 210 * 211 * @param self self reference 212 * @param begin begin position 213 * @param end end position 214 * 215 * @return sub array 216 */ 217 @Function(attributes = Attribute.NOT_ENUMERABLE) 218 protected static NativeInt8Array subarray(final Object self, final Object begin, final Object end) { 219 return (NativeInt8Array)ArrayBufferView.subarrayImpl(self, begin, end); 220 } 221 222 @Override 223 protected ScriptObject getPrototype(final Global global) { 224 return global.getInt8ArrayPrototype(); 225 } 226} 227