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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
* .
*/
/**
* BranchHandle is returned by specialized InstructionList.append() whenever a BranchInstruction is appended. This is useful when
* the target of this instruction is not known at time of creation and must be set later via setTarget().
*
* @see InstructionHandle
* @see Instruction
* @see InstructionList
* @version $Id: BranchHandle.java,v 1.5 2009/10/05 17:35:36 aclement Exp $
* @author M. Dahm
*/
public final class BranchHandle extends InstructionHandle {
private InstructionBranch bi; // An alias in fact, but saves lots of casts
private BranchHandle(InstructionBranch i) {
super(i);
bi = i;
}
static final BranchHandle getBranchHandle(InstructionBranch i) {
return new BranchHandle(i);
}
/*
* Override InstructionHandle methods: delegate to branch instruction. Through this overriding all access to the private
* i_position field should be prevented.
*/
public int getPosition() {
return bi.positionOfThisInstruction;
}
void setPosition(int pos) {
this.pos = bi.positionOfThisInstruction = pos;
}
/**
* Called by InstructionList.setPositions when setting the position for every instruction. In the presence of variable length
* instructions 'setPositions()' performs multiple passes over the instruction list to calculate the correct (byte) positions
* and offsets by calling this function.
*
* @param offset additional offset caused by preceding (variable length) instructions
* @param max_offset the maximum offset that may be caused by these instructions
* @return additional offset caused by possible change of this instruction's length
*/
protected int updatePosition(int offset, int max_offset) {
int x = bi.updatePosition(offset, max_offset);
pos = bi.positionOfThisInstruction;
return x;
}
/**
* Pass new target to instruction.
*/
public void setTarget(InstructionHandle ih) {
bi.setTarget(ih);
}
/**
* Update target of instruction.
*/
public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
bi.updateTarget(old_ih, new_ih);
}
/**
* @return target of instruction.
*/
public InstructionHandle getTarget() {
return bi.getTarget();
}
/**
* Set new contents. Old instruction is disposed and may not be used anymore.
*/
public void setInstruction(Instruction i) {
super.setInstruction(i);
bi = (InstructionBranch) i;
}
}
