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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
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*
* 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).
*
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package jdk.nashorn.internal.runtime.arrays;
import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.util.Arrays;
import jdk.nashorn.internal.runtime.JSType;
import jdk.nashorn.internal.runtime.ScriptRuntime;
/**
* Implementation of {@link ArrayData} as soon as an Object has been
* written to the array
*/
final class ObjectArrayData extends ContinuousArrayData implements AnyElements {
/**
* The wrapped array
*/
private Object[] array;
/**
* Constructor
* @param array an int array
* @param length a length, not necessarily array.length
*/
ObjectArrayData(final Object[] array, final int length) {
super(length);
assert array.length >= length;
this.array = array;
}
@Override
public final Class<?> getElementType() {
return Object.class;
}
@Override
public final Class<?> getBoxedElementType() {
return getElementType();
}
@Override
public final int getElementWeight() {
return 4;
}
@Override
public final ContinuousArrayData widest(final ContinuousArrayData otherData) {
return otherData instanceof NumericElements ? this : otherData;
}
@Override
public ObjectArrayData copy() {
return new ObjectArrayData(array.clone(), (int)length());
}
@Override
public Object[] asObjectArray() {
return array.length == length() ? array.clone() : asObjectArrayCopy();
}
private Object[] asObjectArrayCopy() {
final long len = length();
assert len <= Integer.MAX_VALUE;
final Object[] copy = new Object[(int)len];
System.arraycopy(array, 0, copy, 0, (int)len);
return copy;
}
@Override
public ObjectArrayData convert(final Class<?> type) {
return this;
}
@Override
public void shiftLeft(final int by) {
System.arraycopy(array, by, array, 0, array.length - by);
}
@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); //fill with undefined or OK? TODO
}
if (safeIndex >= length()) {
setLength(safeIndex + 1);
}
return this;
}
@Override
public ArrayData shrink(final long newLength) {
Arrays.fill(array, (int) newLength, array.length, ScriptRuntime.UNDEFINED);
return this;
}
@Override
public ArrayData set(final int index, final Object value, final boolean strict) {
array[index] = value;
setLength(Math.max(index + 1, length()));
return this;
}
@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;
}
@Override
public ArrayData setEmpty(final int index) {
array[index] = ScriptRuntime.EMPTY;
return this;
}
@Override
public ArrayData setEmpty(final long lo, final long hi) {
// hi parameter is inclusive, but Arrays.fill toIndex parameter is exclusive
Arrays.fill(array, (int)Math.max(lo, 0L), (int)Math.min(hi + 1, Integer.MAX_VALUE), ScriptRuntime.EMPTY);
return this;
}
private static final MethodHandle HAS_GET_ELEM = specialCall(MethodHandles.lookup(), ObjectArrayData.class, "getElem", Object.class, int.class).methodHandle();
private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), ObjectArrayData.class, "setElem", void.class, int.class, Object.class).methodHandle();
@SuppressWarnings("unused")
private Object getElem(final int index) {
if (has(index)) {
return array[index];
}
throw new ClassCastException();
}
@SuppressWarnings("unused")
private void setElem(final int index, final Object elem) {
if (hasRoomFor(index)) {
array[index] = elem;
return;
}
throw new ClassCastException();
}
@Override
public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) {
if (returnType.isPrimitive()) {
return null;
}
return getContinuousElementGetter(HAS_GET_ELEM, returnType, programPoint);
}
@Override
public MethodHandle getElementSetter(final Class<?> elementType) {
return getContinuousElementSetter(SET_ELEM, Object.class);
}
@Override
public int getInt(final int index) {
return JSType.toInt32(array[index]);
}
@Override
public double getDouble(final int index) {
return JSType.toNumber(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) {
setEmpty(index);
return new DeletedRangeArrayFilter(this, index, index);
}
@Override
public ArrayData delete(final long fromIndex, final long toIndex) {
setEmpty(fromIndex, toIndex);
return new DeletedRangeArrayFilter(this, fromIndex, toIndex);
}
@Override
public double fastPush(final int arg) {
return fastPush((Object)arg);
}
@Override
public double fastPush(final long arg) {
return fastPush((Object)arg);
}
@Override
public double fastPush(final double arg) {
return fastPush((Object)arg);
}
@Override
public double fastPush(final Object arg) {
final int len = (int)length();
if (len == array.length) {
array = Arrays.copyOf(array, nextSize(len));
}
array[len] = arg;
return increaseLength();
}
@Override
public Object fastPopObject() {
if (length() == 0) {
return ScriptRuntime.UNDEFINED;
}
final int newLength = (int)decreaseLength();
final Object elem = array[newLength];
array[newLength] = ScriptRuntime.EMPTY;
return elem;
}
@Override
public Object pop() {
if (length() == 0) {
return ScriptRuntime.UNDEFINED;
}
final int newLength = (int)length() - 1;
final Object elem = array[newLength];
setEmpty(newLength);
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 ObjectArrayData(Arrays.copyOfRange(array, (int)from, (int)to), (int)newLength);
}
@Override
public ArrayData push(final boolean strict, final Object item) {
final long len = length();
final ArrayData newData = ensure(len);
if (newData == this) {
array[(int)len] = item;
return this;
}
return newData.set((int)len, item, strict);
}
@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 ObjectArrayData(Arrays.copyOfRange(array, start, start + removed), removed);
if (newLength != oldLength) {
final Object[] newArray;
if (newLength > array.length) {
newArray = new Object[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 ContinuousArrayData fastConcat(final ContinuousArrayData otherData) {
final int otherLength = (int)otherData.length();
final int thisLength = (int)length();
assert otherLength > 0 && thisLength > 0;
final Object[] otherArray = ((ObjectArrayData)otherData).array;
final int newLength = otherLength + thisLength;
final Object[] newArray = new Object[ArrayData.alignUp(newLength)];
System.arraycopy(array, 0, newArray, 0, thisLength);
System.arraycopy(otherArray, 0, newArray, thisLength, otherLength);
return new ObjectArrayData(newArray, newLength);
}
@Override
public String toString() {
assert length() <= array.length : length() + " > " + array.length;
return getClass().getSimpleName() + ':' + Arrays.toString(Arrays.copyOf(array, (int)length()));
}
}