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package org.aspectj.apache.bcel.generic;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache BCEL" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact [email protected].
*
* 5. Products derived from this software may not be called "Apache",
* "Apache BCEL", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*/
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.aspectj.apache.bcel.classfile.Utility;
/**
* Instances of this class give users a handle to the instructions contained in an InstructionList. Instruction objects may be used
* more than once within a list, this is useful because it saves memory and may be much faster.
*
* Within an InstructionList an InstructionHandle object is wrapped around all instructions, i.e., it implements a cell in a
* doubly-linked list. From the outside only the next and the previous instruction (handle) are accessible. One can traverse the
* list via an Enumeration returned by InstructionList.elements().
*
* @version $Id: InstructionHandle.java,v 1.9 2009/10/05 17:35:36 aclement Exp $
* @author M. Dahm
* @see Instruction
* @see BranchHandle
* @see InstructionList
*/
public class InstructionHandle implements java.io.Serializable {
InstructionHandle next, prev; // Will be set from the outside
Instruction instruction;
protected int pos = -1; // byte code offset of instruction
private Set targeters = Collections.emptySet();
protected InstructionHandle(Instruction i) {
setInstruction(i);
}
static final InstructionHandle getInstructionHandle(Instruction i) {
return new InstructionHandle(i);
}
public final InstructionHandle getNext() {
return next;
}
public final InstructionHandle getPrev() {
return prev;
}
public final Instruction getInstruction() {
return instruction;
}
/**
* Replace current instruction contained in this handle. Old instruction is disposed using Instruction.dispose().
*/
public void setInstruction(Instruction i) { // Overridden in BranchHandle
if (instruction != null) {
instruction.dispose();
}
instruction = i;
}
/**
* @return the position, i.e., the byte code offset of the contained instruction. This is accurate only after
* InstructionList.setPositions() has been called.
*/
public int getPosition() {
return pos;
}
/**
* Set the position, i.e., the byte code offset of the contained instruction.
*/
void setPosition(int pos) {
this.pos = pos;
}
/**
* Delete contents, i.e., remove user access and make handle reusable.
*/
// OPTIMIZE get rid of this? why do we need it
void dispose() {
next = prev = null;
instruction.dispose();
instruction = null;
pos = -1;
removeAllTargeters();
}
/**
* Remove all targeters, if any.
*/
public void removeAllTargeters() {
targeters.clear();
}
/**
* Denote this handle isn't referenced anymore by t.
*/
public void removeTargeter(InstructionTargeter t) {
targeters.remove(t);
}
/**
* Denote this handle is being referenced by t.
*/
public void addTargeter(InstructionTargeter t) {
if (targeters == Collections.EMPTY_SET) {
targeters = new HashSet();
}
targeters.add(t);
}
public boolean hasTargeters() {
return !targeters.isEmpty();
}
public Set getTargeters() {
return targeters;
}
public Set getTargetersCopy() {
Set copy = new HashSet();
copy.addAll(targeters);
return copy;
}
/**
* @return a (verbose) string representation of the contained instruction.
*/
public String toString(boolean verbose) {
return Utility.format(pos, 4, false, ' ') + ": " + instruction.toString(verbose);
}
public String toString() {
return toString(true);
}
}
