jdk8-mips64-public/nashorn: src/jdk/nashorn/internal/objects/ArrayBufferView.java@da1e581c933b (annotated)

src/jdk/nashorn/internal/objects/ArrayBufferView.java@da1e581c933b (annotated)

src/jdk/nashorn/internal/objects/ArrayBufferView.java

Fri, 21 Dec 2012 16:36:24 -0400

author: jlaskey
date: Fri, 21 Dec 2012 16:36:24 -0400
changeset 3: da1e581c933b
child 7: 5a1b0714df0e
permissions: -rw-r--r--

8005403: Open-source Nashorn
Reviewed-by: attila, hannesw, lagergren, sundar
Contributed-by: james.laskey@oracle.com, akhil.arora@oracle.com, andreas.woess@jku.at, attila.szegedi@oracle.com, hannes.wallnoefer@oracle.com, henry.jen@oracle.com, marcus.lagergren@oracle.com, pavel.semenov@oracle.com, pavel.stepanov@oracle.com, petr.hejl@oracle.com, petr.pisl@oracle.com, sundararajan.athijegannathan@oracle.com

 /*
  * Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */
 package jdk.nashorn.internal.objects;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Getter;
 import jdk.nashorn.internal.objects.annotations.ScriptClass;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.ScriptObject;
 import jdk.nashorn.internal.runtime.ScriptRuntime;
 import jdk.nashorn.internal.runtime.arrays.ArrayData;
 @ScriptClass("ArrayBufferView")
 abstract class ArrayBufferView extends ScriptObject {
     ArrayBufferView(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
         checkConstructorArgs(buffer, byteOffset, elementLength);
         this.setProto(getPrototype());
         this.setArray(factory().createArrayData(buffer, byteOffset, elementLength));
     }
     private void checkConstructorArgs(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
         if (byteOffset < 0 || elementLength < 0) {
             throw new RuntimeException("byteOffset or length must not be negative");
         }
         if (byteOffset + elementLength * bytesPerElement() > buffer.getByteLength()) {
             throw new RuntimeException("byteOffset + byteLength out of range");
         }
         if (byteOffset % bytesPerElement() != 0) {
             throw new RuntimeException("byteOffset must be a multiple of the element size");
         }
     }
     private int bytesPerElement() {
         return factory().bytesPerElement;
     }
     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
     public static Object BYTES_PER_ELEMENT(final Object self) {
         return ((ArrayBufferView)self).bytesPerElement();
     }
     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
     public static Object buffer(final Object self) {
         return ((ArrayDataImpl)((ArrayBufferView)self).getArray()).buffer;
     }
     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
     public static Object byteOffset(final Object self) {
         return ((ArrayDataImpl)((ArrayBufferView)self).getArray()).byteOffset;
     }
     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
     public static Object byteLength(final Object self) {
         final ArrayBufferView view = (ArrayBufferView)self;
         return ((ArrayDataImpl)view.getArray()).elementLength * view.bytesPerElement();
     }
     @Getter(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE)
     public static Object length(final Object self) {
         return ((ArrayBufferView)self).elementLength();
     }
     @Override
     public final Object getLength() {
         return elementLength();
     }
     private int elementLength() {
         return ((ArrayDataImpl)getArray()).elementLength;
     }
     protected static abstract class ArrayDataImpl extends ArrayData {
         protected final NativeArrayBuffer buffer;
         protected final int byteOffset;
         private final int elementLength;
         protected ArrayDataImpl(final NativeArrayBuffer buffer, final int byteOffset, final int elementLength) {
             super(elementLength);
             this.buffer = buffer;
             this.byteOffset = byteOffset;
             this.elementLength = elementLength;
         }
         @Override
         public Object[] asObjectArray() {
             final Object[] array = new Object[elementLength];
             for (int i = 0; i < elementLength; i++) {
                 array[i] = getObjectImpl(i);
             }
             return array;
         }
         @Override
         public ArrayData ensure(final long safeIndex) {
             return this;
         }
         @Override
         public void setLength(final long length) {
             //empty?
             //TODO is this right?
         }
         @Override
         public ArrayData shrink(final long newLength) {
             return this;
         }
         @Override
         public ArrayData set(final int index, final Object value, final boolean strict) {
             if (has(index)) {
                 setImpl(index, value);
             }
             return this;
         }
         @Override
         public ArrayData set(final int index, final int value, final boolean strict) {
             if (has(index)) {
                 setImpl(index, value);
             }
             return this;
         }
         @Override
         public ArrayData set(final int index, final long value, final boolean strict) {
             if (has(index)) {
                 setImpl(index, value);
             }
             return this;
         }
         @Override
         public ArrayData set(final int index, final double value, final boolean strict) {
             if (has(index)) {
                 setImpl(index, value);
             }
             return this;
         }
         @Override
         public int getInt(final int index) {
             return getIntImpl(index);
         }
         @Override
         public long getLong(final int index) {
             return getLongImpl(index);
         }
         @Override
         public double getDouble(final int index) {
             return getDoubleImpl(index);
         }
         @Override
         public Object getObject(final int index) {
             return getObjectImpl(index);
         }
         @Override
         public boolean has(final int index) {
             return index >= 0 && index < elementLength;
         }
         @Override
         public boolean canDelete(final int index, final boolean strict) {
             return false;
         }
         @Override
         public boolean canDelete(final long fromIndex, final long toIndex, final boolean strict) {
             return false;
         }
         @Override
         public ArrayData delete(final int index) {
             return this;
         }
         @Override
         public ArrayData delete(final long fromIndex, final long toIndex) {
             return this;
         }
         @Override
         protected ArrayData convert(final Class<?> type) {
             return this;
         }
         @Override
         public void shiftLeft(final int by) {
             throw new UnsupportedOperationException();
         }
         @Override
         public ArrayData shiftRight(final int by) {
             throw new UnsupportedOperationException();
         }
         @Override
         public Object pop() {
             throw new UnsupportedOperationException();
         }
         @Override
         public ArrayData slice(final long from, final long to) {
             throw new UnsupportedOperationException();
         }
         protected abstract int getIntImpl(int key);
         protected long getLongImpl(final int key) {
             return getIntImpl(key);
         }
         protected double getDoubleImpl(final int key) {
             return getIntImpl(key);
         }
         protected Object getObjectImpl(final int key) {
             return getIntImpl(key);
         }
         protected abstract void setImpl(int key, int value);
         protected void setImpl(final int key, final long value) {
             setImpl(key, (int)value);
         }
         protected void setImpl(final int key, final double value) {
             setImpl(key, JSType.toInt32(value));
         }
         protected void setImpl(final int key, final Object value) {
             setImpl(key, JSType.toInt32(value));
         }
         protected abstract int byteIndex(int index);
     }
     protected static abstract class Factory {
         final int bytesPerElement;
         public Factory(final int bytesPerElement) {
             this.bytesPerElement = bytesPerElement;
         }
         public final ArrayBufferView construct(final int elementLength) {
             return construct(new NativeArrayBuffer(elementLength * bytesPerElement), 0, elementLength);
         }
         public abstract ArrayBufferView construct(NativeArrayBuffer buffer, int byteOffset, int elementLength);
         public abstract ArrayData createArrayData(NativeArrayBuffer buffer, int byteOffset, int elementLength);
     }
     protected abstract Factory factory();
     protected abstract ScriptObject getPrototype();
     protected boolean isFloatArray() {
         return false;
     }
     protected static ArrayBufferView constructorImpl(final Object[] args, final Factory factory) {
         final Object arg0 = args.length != 0 ? args[0] : 0;
         final ArrayBufferView dst;
         final int length;
         if (arg0 instanceof NativeArrayBuffer) {
             // Constructor(ArrayBuffer buffer, optional unsigned long byteOffset, optional unsigned long length)
             final NativeArrayBuffer buffer = (NativeArrayBuffer) arg0;
             final int byteOffset = args.length > 1 ? JSType.toInt32(args[1]) : 0;
             if (args.length > 2) {
                 length = JSType.toInt32(args[2]);
             } else {
                 if ((buffer.getByteLength() - byteOffset) % factory.bytesPerElement != 0) {
                     throw new RuntimeException("buffer.byteLength - byteOffset must be a multiple of the element size");
                 }
                 length = (buffer.getByteLength() - byteOffset) / factory.bytesPerElement;
             }
             return factory.construct(buffer, byteOffset, length);
         } else if (arg0 instanceof ArrayBufferView) {
             // Constructor(TypedArray array)
             length = ((ArrayBufferView)arg0).elementLength();
             dst = factory.construct(length);
         } else if (arg0 instanceof NativeArray) {
             // Constructor(type[] array)
             length = (int) (((NativeArray) arg0).getArray().length() & 0x7fff_ffff);
             dst = factory.construct(length);
         } else {
             // Constructor(unsigned long length)
             length = JSType.toInt32(arg0);
             return factory.construct(length);
         }
         copyElements(dst, length, (ScriptObject)arg0, 0);
         return dst;
     }
     protected static Object setImpl(final Object self, final Object array, final Object offset0) {
         final ArrayBufferView dest = ((ArrayBufferView)self);
         final int length;
         if (array instanceof ArrayBufferView) {
             // void set(TypedArray array, optional unsigned long offset)
             length = ((ArrayBufferView)array).elementLength();
         } else if (array instanceof NativeArray) {
             // void set(type[] array, optional unsigned long offset)
             length = (int) (((NativeArray) array).getArray().length() & 0x7fff_ffff);
         } else {
             throw new RuntimeException("argument is not of array type");
         }
         final ScriptObject source = (ScriptObject) array;
         final int offset = JSType.toInt32(offset0); // default=0
         if (dest.elementLength() < length + offset || offset < 0) {
             throw new RuntimeException("offset or array length out of bounds");
         }
         copyElements(dest, length, source, offset);
         return ScriptRuntime.UNDEFINED;
     }
     private static void copyElements(final ArrayBufferView dest, final int length, final ScriptObject source, final int offset) {
         if (!dest.isFloatArray()) {
             for (int i = 0, j = offset; i < length; i++, j++) {
                 dest.set(j, source.getInt(i), false);
             }
         } else {
             for (int i = 0, j = offset; i < length; i++, j++) {
                 dest.set(j, source.getDouble(i), false);
             }
         }
     }
     protected static Object subarrayImpl(final Object self, final Object begin0, final Object end0) {
         final ArrayBufferView arrayView = ((ArrayBufferView)self);
         final int elementLength = arrayView.elementLength();
         final int begin = NativeArrayBuffer.adjustIndex(JSType.toInt32(begin0), elementLength);
         final int end = NativeArrayBuffer.adjustIndex(end0 != ScriptRuntime.UNDEFINED ? JSType.toInt32(end0) : elementLength, elementLength);
         final ArrayDataImpl arrayData = (ArrayDataImpl)arrayView.getArray();
         return arrayView.factory().construct(arrayData.buffer, arrayData.byteIndex(begin), Math.max(end - begin, 0));
     }
 }

Mercurial > jdk8-mips64-public > nashorn / annotate

src/jdk/nashorn/internal/objects/ArrayBufferView.java@da1e581c933b (annotated)

src/jdk/nashorn/internal/objects/ArrayBufferView.java