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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package jdk.nashorn.internal.runtime.arrays;

import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall;
import static jdk.nashorn.internal.lookup.Lookup.MH;
import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;

import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.util.Arrays;
import jdk.dynalink.linker.support.TypeUtilities;
import jdk.nashorn.internal.runtime.JSType;

Implementation of ArrayData as soon as a double has been written to the array
/** * Implementation of {@link ArrayData} as soon as a double has been * written to the array */
final class NumberArrayData extends ContinuousArrayData implements NumericElements {
The wrapped array
/** * The wrapped array */
private double[] array;
Constructor
Params:
  • array – an int array
  • length – a length, not necessarily array.length
/** * Constructor * @param array an int array * @param length a length, not necessarily array.length */
NumberArrayData(final double[] array, final int length) { super(length); assert array.length >= length; this.array = array; } @Override public final Class<?> getElementType() { return double.class; } @Override public final Class<?> getBoxedElementType() { return Double.class; } @Override public final int getElementWeight() { return 3; } @Override public final ContinuousArrayData widest(final ContinuousArrayData otherData) { return otherData instanceof IntOrLongElements ? this : otherData; } @Override public NumberArrayData copy() { return new NumberArrayData(array.clone(), (int)length()); } @Override public Object[] asObjectArray() { return toObjectArray(true); } private Object[] toObjectArray(final boolean trim) { assert length() <= array.length : "length exceeds internal array size"; final int len = (int)length(); final Object[] oarray = new Object[trim ? len : array.length]; for (int index = 0; index < len; index++) { oarray[index] = array[index]; } return oarray; } @Override public Object asArrayOfType(final Class<?> componentType) { if (componentType == double.class) { final int len = (int)length(); return array.length == len ? array.clone() : Arrays.copyOf(array, len); } return super.asArrayOfType(componentType); } private static boolean canWiden(final Class<?> type) { return TypeUtilities.isWrapperType(type) && type != Boolean.class && type != Character.class; } @Override public ContinuousArrayData convert(final Class<?> type) { if (! canWiden(type)) { final int len = (int)length(); return new ObjectArrayData(toObjectArray(false), len); } return this; } @Override public ArrayData shiftLeft(final int by) { if (by >= length()) { shrink(0); } else { System.arraycopy(array, by, array, 0, array.length - by); } setLength(Math.max(0, length() - by)); return this; } @Override public ArrayData shiftRight(final int by) { final ArrayData newData = ensure(by + length() - 1); if (newData != this) { newData.shiftRight(by); return newData; } System.arraycopy(array, 0, array, by, array.length - by); return this; } @Override public ArrayData ensure(final long safeIndex) { if (safeIndex >= SparseArrayData.MAX_DENSE_LENGTH) { return new SparseArrayData(this, safeIndex + 1); } final int alen = array.length; if (safeIndex >= alen) { final int newLength = ArrayData.nextSize((int)safeIndex); array = Arrays.copyOf(array, newLength); //todo fill with nan or never accessed? } if (safeIndex >= length()) { setLength(safeIndex + 1); } return this; } @Override public ArrayData shrink(final long newLength) { Arrays.fill(array, (int)newLength, array.length, 0.0); return this; } @Override public ArrayData set(final int index, final Object value, final boolean strict) { if (value instanceof Double || (value != null && canWiden(value.getClass()))) { return set(index, ((Number)value).doubleValue(), strict); } else if (value == UNDEFINED) { return new UndefinedArrayFilter(this).set(index, value, strict); } final ArrayData newData = convert(value == null ? Object.class : value.getClass()); return newData.set(index, value, strict); } @Override public ArrayData set(final int index, final int value, final boolean strict) { array[index] = value; setLength(Math.max(index + 1, length())); return this; } @Override public ArrayData set(final int index, final double value, final boolean strict) { array[index] = value; setLength(Math.max(index + 1, length())); return this; } private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), NumberArrayData.class, "getElem", double.class, int.class).methodHandle(); private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), NumberArrayData.class, "setElem", void.class, int.class, double.class).methodHandle(); @SuppressWarnings("unused") private double getElem(final int index) { if (has(index)) { return array[index]; } throw new ClassCastException(); } @SuppressWarnings("unused") private void setElem(final int index, final double elem) { if (hasRoomFor(index)) { array[index] = elem; return; } throw new ClassCastException(); } @Override public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) { if (returnType == int.class) { return null; } return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint); } @Override public MethodHandle getElementSetter(final Class<?> elementType) { return elementType.isPrimitive() ? getContinuousElementSetter(MH.asType(SET_ELEM, SET_ELEM.type().changeParameterType(2, elementType)), elementType) : null; } @Override public int getInt(final int index) { return JSType.toInt32(array[index]); } @Override public double getDouble(final int index) { return array[index]; } @Override public double getDoubleOptimistic(final int index, final int programPoint) { return array[index]; } @Override public Object getObject(final int index) { return array[index]; } @Override public boolean has(final int index) { return 0 <= index && index < length(); } @Override public ArrayData delete(final int index) { return new DeletedRangeArrayFilter(this, index, index); } @Override public ArrayData delete(final long fromIndex, final long toIndex) { return new DeletedRangeArrayFilter(this, fromIndex, toIndex); } @Override public Object pop() { final int len = (int)length(); if (len == 0) { return UNDEFINED; } final int newLength = len - 1; final double elem = array[newLength]; array[newLength] = 0; setLength(newLength); return elem; } @Override public ArrayData slice(final long from, final long to) { final long start = from < 0 ? from + length() : from; final long newLength = to - start; return new NumberArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)newLength); } @Override public ArrayData fastSplice(final int start, final int removed, final int added) throws UnsupportedOperationException { final long oldLength = length(); final long newLength = oldLength - removed + added; if (newLength > SparseArrayData.MAX_DENSE_LENGTH && newLength > array.length) { throw new UnsupportedOperationException(); } final ArrayData returnValue = removed == 0 ? EMPTY_ARRAY : new NumberArrayData(Arrays.copyOfRange(array, start, start + removed), removed); if (newLength != oldLength) { final double[] newArray; if (newLength > array.length) { newArray = new double[ArrayData.nextSize((int)newLength)]; System.arraycopy(array, 0, newArray, 0, start); } else { newArray = array; } System.arraycopy(array, start + removed, newArray, start + added, (int)(oldLength - start - removed)); array = newArray; setLength(newLength); } return returnValue; } @Override public double fastPush(final int arg) { return fastPush((double)arg); } @Override public double fastPush(final long arg) { return fastPush((double)arg); } @Override public double fastPush(final double arg) { final int len = (int)length(); if (len == array.length) { //note that fastpush never creates spares arrays, there is nothing to gain by that - it will just use even more memory array = Arrays.copyOf(array, nextSize(len)); } array[len] = arg; return increaseLength(); } @Override public double fastPopDouble() { if (length() == 0) { throw new ClassCastException(); } final int newLength = (int)decreaseLength(); final double elem = array[newLength]; array[newLength] = 0; return elem; } @Override public Object fastPopObject() { return fastPopDouble(); } @Override public ContinuousArrayData fastConcat(final ContinuousArrayData otherData) { final int otherLength = (int)otherData.length(); final int thisLength = (int)length(); assert otherLength > 0 && thisLength > 0; final double[] otherArray = ((NumberArrayData)otherData).array; final int newLength = otherLength + thisLength; final double[] newArray = new double[ArrayData.alignUp(newLength)]; System.arraycopy(array, 0, newArray, 0, thisLength); System.arraycopy(otherArray, 0, newArray, thisLength, otherLength); return new NumberArrayData(newArray, newLength); } @Override public String toString() { assert length() <= array.length : length() + " > " + array.length; return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length())); } }