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/* *******************************************************************
* Copyright (c) 2002 Palo Alto Research Center, Incorporated (PARC).
* All rights reserved.
* This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0
* which accompanies this distribution and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* PARC initial implementation
* ******************************************************************/
package org.aspectj.weaver.bcel;
import org.aspectj.apache.bcel.generic.Instruction;
import org.aspectj.apache.bcel.generic.InstructionFactory;
import org.aspectj.apache.bcel.generic.InstructionList;
import org.aspectj.weaver.ResolvedType;
import org.aspectj.weaver.ast.Var;
public class BcelVar extends Var {
private int positionInAroundState = -1;
private int slot;
public BcelVar(ResolvedType type, int slot) {
super(type);
this.slot = slot;
}
public String toString() {
return "BcelVar(" + getType() + " " + slot +
((positionInAroundState != -1) ? (" " + positionInAroundState) : "") +
")";
}
public int getSlot() { return slot; }
// fact is used in the subtypes
public Instruction createLoad(InstructionFactory fact) {
return InstructionFactory.createLoad(BcelWorld.makeBcelType(getType()), slot);
}
public Instruction createStore(InstructionFactory fact) {
return InstructionFactory.createStore(BcelWorld.makeBcelType(getType()), slot);
}
public void appendStore(InstructionList il, InstructionFactory fact) {
il.append(createStore(fact));
}
public void appendLoad(InstructionList il, InstructionFactory fact) {
il.append(createLoad(fact));
}
public void appendLoadAndConvert(
InstructionList il,
InstructionFactory fact,
ResolvedType toType) {
il.append(createLoad(fact));
Utility.appendConversion(il, fact, getType(), toType);
}
public void insertLoad(InstructionList il, InstructionFactory fact) {
il.insert(createLoad(fact));
}
public InstructionList createCopyFrom(InstructionFactory fact, int oldSlot) {
InstructionList il = new InstructionList();
il.append(InstructionFactory.createLoad(BcelWorld.makeBcelType(getType()), oldSlot));
il.append(createStore(fact));
return il;
}
// this is an array var
void appendConvertableArrayLoad(
InstructionList il,
InstructionFactory fact,
int index,
ResolvedType convertTo)
{
ResolvedType convertFromType = getType().getResolvedComponentType();
appendLoad(il, fact);
il.append(Utility.createConstant(fact, index));
il.append(InstructionFactory.createArrayLoad(BcelWorld.makeBcelType(convertFromType)));
Utility.appendConversion(il, fact, convertFromType, convertTo);
}
void appendConvertableArrayStore(
InstructionList il,
InstructionFactory fact,
int index,
BcelVar storee)
{
ResolvedType convertToType = getType().getResolvedComponentType();
appendLoad(il, fact);
il.append(Utility.createConstant(fact, index));
storee.appendLoad(il, fact);
Utility.appendConversion(il, fact, storee.getType(), convertToType);
il.append(InstructionFactory.createArrayStore(BcelWorld.makeBcelType(convertToType)));
}
InstructionList createConvertableArrayStore(
InstructionFactory fact,
int index,
BcelVar storee)
{
InstructionList il = new InstructionList();
appendConvertableArrayStore(il, fact, index, storee);
return il;
}
InstructionList createConvertableArrayLoad(
InstructionFactory fact,
int index,
ResolvedType convertTo)
{
InstructionList il = new InstructionList();
appendConvertableArrayLoad(il, fact, index, convertTo);
return il;
}
public int getPositionInAroundState() {
return positionInAroundState;
}
public void setPositionInAroundState(int positionInAroundState) {
this.positionInAroundState = positionInAroundState;
}
// random useful fields
public static final BcelVar[] NONE = new BcelVar[] {};
}
