//
// Copyright (C) 2010 Wayne Meissner
// Copyright (c) 2008-2009, Petr Kobalicek <kobalicek.petr@gmail.com>
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
package jnr.x86asm;
import java.util.
LinkedList;
import java.util.
List;
import static jnr.x86asm.
LABEL_STATE.*;
/**
*
*/
public final class
Label extends
Operand {
/** Label Id (0 means unknown). */
final int
id;
/** State of label, see {@link LABEL_STATE}. */
LABEL_STATE state;
/** Position (always positive, information depends to @c state). */
int
position;
final
List<
LinkData>
links = new
LinkedList<
LinkData>();
public
Label() {
this(0);
}
public
Label(int
id) {
super(
OP.
OP_LABEL, 4);
this.
id =
id;
this.
state =
LABEL_STATE_UNUSED;
this.
position = -1;
}
/** Returns @c true if label is unused (not bound or linked). */
final boolean
isUnused() {
return
state ==
LABEL_STATE_UNUSED;
}
/** Returns @c true if label is linked. */
final boolean
isLinked() {
return
state ==
LABEL_STATE_LINKED;
}
/** Returns @c true if label is bound. */
final boolean
isBound() {
return
state ==
LABEL_STATE_BOUND;
}
/** Returns the position of bound or linked labels, -1 if label
* is unused.
*/
final int
position() {
return
position;
}
final void
link(
LinkData link) {
links.
add(
link);
state =
LABEL_STATE_LINKED;
}
}