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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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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 v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * 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[] {};

}