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The AspectJ weaver applies aspects to Java classes. It can be used as a Java agent in order to apply load-time weaving (LTW) during class-loading and also contains the AspectJ runtime classes.

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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.Constants;
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;

/**
 * XXX Erik and I need to discuss this hierarchy. Having FieldRef extend Var is convenient, but hopefully there's a better design.
 *
 * This is always a static reference.
 */
public class BcelFieldRef extends BcelVar {

	private String className, fieldName;

	public BcelFieldRef(ResolvedType type, String className, String fieldName) {
		super(type, 0);
		this.className = className;
		this.fieldName = fieldName;
	}

	public String toString() {
		return "BcelFieldRef(" + getType() + " " + className + "." + fieldName + ")";
	}

	// public int getSlot() { return slot; }

	public Instruction createLoad(InstructionFactory fact) {
		return fact.createFieldAccess(className, fieldName, BcelWorld.makeBcelType(getType()), Constants.GETSTATIC);
	}

	public Instruction createStore(InstructionFactory fact) {
		return fact.createFieldAccess(className, fieldName, BcelWorld.makeBcelType(getType()), Constants.PUTSTATIC);
	}

	public InstructionList createCopyFrom(InstructionFactory fact, int oldSlot) {
		throw new RuntimeException("unimplemented");
	}

	// 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(fact.createArrayLoad(BcelWorld.makeBcelType(convertFromType)));
	// Utility.appendConversion(il, fact, convertFromType, convertTo);
	// }
	//
	// void appendConvertableArrayStore(
	// InstructionList il,
	// InstructionFactory fact,
	// int index,
	// BcelFieldRef 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(fact.createArrayStore(BcelWorld.makeBcelType(convertToType)));
	// }
	//
	// InstructionList createConvertableArrayStore(
	// InstructionFactory fact,
	// int index,
	// BcelFieldRef 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;
	// }
}