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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.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.apache.bcel.generic.Type;
import org.aspectj.weaver.Member;
import org.aspectj.weaver.NameMangler;
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 BcelCflowAccessVar extends BcelVar {

	private Member stackField;
	private int index;

	/**
	 * @param type The type to convert to from Object
	 * @param stackField the member containing the CFLOW_STACK_TYPE
	 * @param index yeah yeah
	 */
	public BcelCflowAccessVar(ResolvedType type, Member stackField, int index) {
		super(type, 0);
		this.stackField = stackField;
		this.index = index;
	}

	public String toString() {
		return "BcelCflowAccessVar(" + getType() + " " + stackField + "." + index + ")";
	}

	public Instruction createLoad(InstructionFactory fact) {
		throw new RuntimeException("unimplemented");
	}

	public Instruction createStore(InstructionFactory fact) {
		throw new RuntimeException("unimplemented");
	}

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

	public void appendLoad(InstructionList il, InstructionFactory fact) {
		il.append(createLoadInstructions(getType(), fact));
	}

	public InstructionList createLoadInstructions(ResolvedType toType, InstructionFactory fact) {
		InstructionList il = new InstructionList();

		il.append(Utility.createGet(fact, stackField));
		il.append(Utility.createConstant(fact, index));
		il.append(fact.createInvoke(NameMangler.CFLOW_STACK_TYPE, "get", Type.OBJECT, new Type[] { Type.INT },
				Constants.INVOKEVIRTUAL));
		il.append(Utility.createConversion(fact, Type.OBJECT, BcelWorld.makeBcelType(toType)));

		return il;

	}

	public void appendLoadAndConvert(InstructionList il, InstructionFactory fact, ResolvedType toType) {
		il.append(createLoadInstructions(toType, fact));

	}

	public void insertLoad(InstructionList il, InstructionFactory fact) {
		il.insert(createLoadInstructions(getType(), fact));
	}

}