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Qbicc support for ELF object file access
package org.qbicc.machine.file.elf;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.function.Consumer;
import java.util.function.IntFunction;
import java.util.function.LongUnaryOperator;
import java.util.function.Predicate;
import org.qbicc.machine.file.bin.BinaryBuffer;
/**
*
*/
public abstract class MappedBitSet extends AbstractSet {
final BinaryBuffer backingBuffer;
final long position;
private final IntFunction decoder;
private final Class type;
final LongUnaryOperator mask;
public static MappedBitSet map8Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder, LongUnaryOperator mask) {
return new _8<>(backingBuffer, position, decoder, type, mask);
}
public static MappedBitSet map8Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder) {
return map8Bits(backingBuffer, position, type, decoder, LongUnaryOperator.identity());
}
public static MappedBitSet map16Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder, LongUnaryOperator mask) {
return new _16<>(backingBuffer, position, decoder, type, mask);
}
public static MappedBitSet map16Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder) {
return map16Bits(backingBuffer, position, type, decoder, LongUnaryOperator.identity());
}
public static MappedBitSet map32Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder, LongUnaryOperator mask) {
return new _32<>(backingBuffer, position, decoder, type, mask);
}
public static MappedBitSet map32Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder) {
return new _32<>(backingBuffer, position, decoder, type, LongUnaryOperator.identity());
}
public static MappedBitSet map64Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder, LongUnaryOperator mask) {
return new _64<>(backingBuffer, position, decoder, type, mask);
}
public static MappedBitSet map64Bits(BinaryBuffer backingBuffer, long position,
Class type, IntFunction decoder) {
return new _64<>(backingBuffer, position, decoder, type, LongUnaryOperator.identity());
}
MappedBitSet(final BinaryBuffer backingBuffer, final long position, final IntFunction decoder, final Class type,
LongUnaryOperator mask) {
this.backingBuffer = backingBuffer;
this.position = position;
this.decoder = decoder;
this.type = type;
this.mask = mask;
}
final long getValue() {
return mask.applyAsLong(getRawValue());
}
public abstract long getRawValue();
final void setValue(long value) {
setRawValue(mask.applyAsLong(value));
}
public abstract void setRawValue(long value);
public Iterator iterator() {
return new Iterator() {
long v = getValue();
public boolean hasNext() {
return v != 0;
}
public E next() {
final long lob = Long.lowestOneBit(v);
if (lob == 0) {
throw new NoSuchElementException();
}
v ^= lob;
return decoder.apply(Long.numberOfTrailingZeros(lob));
}
};
}
public int size() {
return Long.bitCount(getValue());
}
public boolean isEmpty() {
return getValue() == 0;
}
public void forEach(final Consumer action) {
long v = getValue();
while (v != 0) {
final long lob = Long.lowestOneBit(v);
action.accept(decoder.apply(Long.numberOfTrailingZeros(lob)));
v ^= lob;
}
}
public boolean removeIf(final Predicate filter) {
long orig = getValue();
long v = orig;
long remove = 0;
while (v != 0) {
final long lob = Long.lowestOneBit(v);
if (filter.test(decoder.apply(Long.numberOfTrailingZeros(lob)))) {
remove |= lob;
}
v ^= lob;
}
if (remove == 0) {
return false;
}
setValue(orig & ~remove);
return true;
}
public boolean add(final E e) {
type.cast(e);
final int val = e.getValue();
final long value = getValue();
final long bit = 1L << val;
if ((value & bit) == 1) {
// already set
return false;
}
setValue(value | bit);
return true;
}
public boolean remove(final Object o) {
if (type.isInstance(o)) {
final E ne = type.cast(o);
final int val = ne.getValue();
final long value = getValue();
final long bit = 1L << val;
if ((value & bit) == 0) {
// already clear
return false;
}
setValue(value & ~bit);
return true;
} else {
return false;
}
}
public void clear() {
setValue(0);
}
public boolean contains(final Object o) {
if (type.isInstance(o)) {
final E ne = type.cast(o);
final int val = ne.getValue();
final long value = getValue();
final long bit = 1L << val;
return (value & bit) != 0;
} else {
return false;
}
}
public boolean removeAll(final Collection c) {
long remove = 0;
if (c instanceof MappedBitSet && ((MappedBitSet) c).type == type) {
remove = ((MappedBitSet) c).getValue();
} else {
for (Object o : c) {
if (type.isInstance(o)) {
remove |= 1L << type.cast(o).getValue();
}
}
}
if (remove == 0) {
return false;
}
final long old = getValue();
if ((old & remove) == 0) {
return false;
}
setValue(old & ~remove);
return true;
}
public boolean addAll(final Collection c) {
long add = 0;
if (c instanceof MappedBitSet && ((MappedBitSet) c).type == type) {
add = ((MappedBitSet) c).getValue();
} else {
for (E e : c) {
add |= 1L << e.getValue();
}
}
if (add == 0) {
return false;
}
final long old = getValue();
if ((old & add) == add) {
return false;
}
setValue(old | add);
return true;
}
public boolean retainAll(final Collection c) {
long retain = 0;
if (c instanceof MappedBitSet && ((MappedBitSet) c).type == type) {
retain = ((MappedBitSet) c).getValue();
} else {
for (Object o : c) {
if (type.isInstance(o)) {
retain |= 1L << type.cast(o).getValue();
}
}
}
final long old = getValue();
if ((old & ~retain) == 0) {
return false;
}
setValue(old & retain);
return true;
}
public boolean containsAll(final Collection c) {
long find = 0;
if (c instanceof MappedBitSet && ((MappedBitSet) c).type == type) {
find = ((MappedBitSet) c).getValue();
} else {
for (Object o : c) {
if (!type.isInstance(o)) {
return false;
}
find |= 1L << type.cast(o).getValue();
}
}
return (getValue() & find) == find;
}
static final class _8 extends MappedBitSet {
_8(final BinaryBuffer backingBuffer, final long position, final IntFunction decoder, final Class type,
final LongUnaryOperator mask) {
super(backingBuffer, position, decoder, type, mask);
}
public long getRawValue() {
return backingBuffer.getByteUnsigned(position);
}
public void setRawValue(final long value) {
backingBuffer.putByte(position, value);
}
}
static final class _16 extends MappedBitSet {
_16(final BinaryBuffer backingBuffer, final long position, final IntFunction decoder, final Class type,
final LongUnaryOperator mask) {
super(backingBuffer, position, decoder, type, mask);
}
public long getRawValue() {
return backingBuffer.getShortUnsigned(position);
}
public void setRawValue(final long value) {
backingBuffer.putShort(position, value);
}
}
static final class _32 extends MappedBitSet {
_32(final BinaryBuffer backingBuffer, final long position, final IntFunction decoder, final Class type,
final LongUnaryOperator mask) {
super(backingBuffer, position, decoder, type, mask);
}
public long getRawValue() {
return backingBuffer.getIntUnsigned(position);
}
public void setRawValue(final long value) {
backingBuffer.putInt(position, value);
}
}
static final class _64 extends MappedBitSet {
_64(final BinaryBuffer backingBuffer, final long position, final IntFunction decoder, final Class type,
final LongUnaryOperator mask) {
super(backingBuffer, position, decoder, type, mask);
}
public long getRawValue() {
return backingBuffer.getLong(position);
}
public void setRawValue(final long value) {
backingBuffer.putLong(position, value);
}
}
}
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