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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 org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.classfile.ConstantPool;
import org.aspectj.apache.bcel.classfile.LocalVariable;
/**
* This class represents a local variable within a method. It contains its scope, name and type. The generated LocalVariable object
* can be obtained with getLocalVariable which needs the instruction list and the constant pool as parameters.
*
* @version $Id: LocalVariableGen.java,v 1.7 2008/08/28 00:04:23 aclement Exp $
* @author M. Dahm
* @see LocalVariable
* @see MethodGen
*/
public class LocalVariableGen implements InstructionTargeter, Cloneable, java.io.Serializable {
private int index;
private String name;
private Type type;
private InstructionHandle start, end;
/**
* Generate a local variable that with index `index'. Note that double and long variables need two indexs. Index indices have to
* be provided by the user.
*
* @param index index of local variable
* @param name its name
* @param type its type
* @param start from where the instruction is valid (null means from the start)
* @param end until where the instruction is valid (null means to the end)
*/
public LocalVariableGen(int index, String name, Type type, InstructionHandle start, InstructionHandle end) {
if (index < 0 || index > Constants.MAX_SHORT) {
throw new ClassGenException("Invalid index index: " + index);
}
this.name = name;
this.type = type;
this.index = index;
setStart(start);
setEnd(end);
}
/**
* Get LocalVariable object.
*
* This relies on that the instruction list has already been dumped to byte code or or that the `setPositions' methods has been
* called for the instruction list.
*
* Note that for local variables whose scope end at the last instruction of the method's code, the JVM specification is
* ambiguous: both a start_pc+length ending at the last instruction and start_pc+length ending at first index beyond the end of
* the code are valid.
*
* @param il instruction list (byte code) which this variable belongs to
* @param cp constant pool
*/
public LocalVariable getLocalVariable(ConstantPool cp) {
int start_pc = start.getPosition();
int length = end.getPosition() - start_pc;
if (length > 0) {
length += end.getInstruction().getLength();
}
int name_index = cp.addUtf8(name);
int signature_index = cp.addUtf8(type.getSignature());
return new LocalVariable(start_pc, length, name_index, signature_index, index, cp);
}
public void setIndex(int index) {
this.index = index;
}
public int getIndex() {
return index;
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setType(Type type) {
this.type = type;
}
public Type getType() {
return type;
}
public InstructionHandle getStart() {
return start;
}
public InstructionHandle getEnd() {
return end;
}
public void setStart(InstructionHandle start) {
InstructionBranch.notifyTarget(this.start, start, this);
this.start = start;
}
public void setEnd(InstructionHandle end) {
InstructionBranch.notifyTarget(this.end, end, this);
this.end = end;
}
/**
* @param old_ih old target, either start or end
* @param new_ih new target
*/
public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
boolean targeted = false;
if (start == old_ih) {
targeted = true;
setStart(new_ih);
}
if (end == old_ih) {
targeted = true;
setEnd(new_ih);
}
if (!targeted) {
throw new ClassGenException("Not targeting " + old_ih + ", but {" + start + ", " + end + "}");
}
}
/**
* @return true, if ih is target of this variable
*/
public boolean containsTarget(InstructionHandle ih) {
return start == ih || end == ih;
}
/**
* We consider to local variables to be equal, if the use the same index and are valid in the same range.
*/
public boolean equals(Object o) {
if (!(o instanceof LocalVariableGen)) {
return false;
}
LocalVariableGen l = (LocalVariableGen) o;
return l.index == index && l.start == start && l.end == end;
}
public String toString() {
return "LocalVariableGen(" + name + ", " + type + ", " + start + ", " + end + ")";
}
public Object clone() {
try {
return super.clone();
} catch (CloneNotSupportedException e) {
System.err.println(e);
return null;
}
}
}
