org.aspectj.weaver.bcel.BcelCflowStackFieldAdder Maven / Gradle / Ivy

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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.FieldGen;
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.ResolvedMember;
import org.aspectj.weaver.ResolvedType;

public class BcelCflowStackFieldAdder extends BcelTypeMunger {
	private ResolvedMember cflowStackField;

	public BcelCflowStackFieldAdder(ResolvedMember cflowStackField) {
		super(null, (ResolvedType) cflowStackField.getDeclaringType());
		this.cflowStackField = cflowStackField;
	}

	@Override
	public boolean munge(BcelClassWeaver weaver) {
		LazyClassGen gen = weaver.getLazyClassGen();
		if (!gen.getType().equals(cflowStackField.getDeclaringType())) {
			return false;
		}
		FieldGen f = new FieldGen(cflowStackField.getModifiers(), BcelWorld.makeBcelType(cflowStackField.getReturnType()),
				cflowStackField.getName(), gen.getConstantPool());
		gen.addField(f, getSourceLocation());

		LazyMethodGen clinit = gen.getAjcPreClinit(); // StaticInitializer();
		InstructionList setup = new InstructionList();
		InstructionFactory fact = gen.getFactory();

		setup.append(fact.createNew(NameMangler.CFLOW_STACK_TYPE));
		setup.append(InstructionFactory.createDup(1));
		setup.append(fact.createInvoke(NameMangler.CFLOW_STACK_TYPE, "", Type.VOID, Type.NO_ARGS, Constants.INVOKESPECIAL));

		setup.append(Utility.createSet(fact, cflowStackField));
		clinit.getBody().insert(setup);

		return true;
	}

	@Override
	public ResolvedMember getMatchingSyntheticMember(Member member) {
		return null;
	}

	@Override
	public ResolvedMember getSignature() {
		return cflowStackField;
	}

	@Override
	public boolean matches(ResolvedType onType) {
		return onType.equals(cflowStackField.getDeclaringType());
	}

	@Override
	public boolean existsToSupportShadowMunging() {
		return true;
	}

}