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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.org.apache.bcel.internal.verifier.structurals;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache BCEL" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache BCEL", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 */

import com.sun.org.apache.bcel.internal.generic.*;
import com.sun.org.apache.bcel.internal.verifier.exc.*;
import java.util.ArrayList;

/**
 * This class represents a JVM execution frame; that means,
 * a local variable array and an operand stack.
 *
 * @version $Id: Frame.java,v 1.3 2007-07-19 04:35:00 ofung Exp $
 * @author Enver Haase
 */
 
public class Frame{

	/**
	 * For instance initialization methods, it is important to remember
	 * which instance it is that is not initialized yet. It will be
	 * initialized invoking another constructor later.
	 * NULL means the instance already *is* initialized.
	 */
	protected static UninitializedObjectType _this;

	/**
	 *
	 */
	private LocalVariables locals;

	/**
	 *
	 */
	private OperandStack stack;

	/**
	 *
	 */
	public Frame(int maxLocals, int maxStack){
		locals = new LocalVariables(maxLocals);
		stack = new OperandStack(maxStack);
	}

	/**
	 *
	 */
	public Frame(LocalVariables locals, OperandStack stack){
		this.locals = locals;
		this.stack = stack;
	}

	/**
	 *
	 */
	protected Object clone(){
		Frame f = new Frame(locals.getClone(), stack.getClone());
		return f;
	}

	/**
	 *
	 */
	public Frame getClone(){
		return (Frame) clone();
	}

	/**
	 *
	 */
	public LocalVariables getLocals(){
		return locals;
	}

	/**
	 *
	 */
	public OperandStack getStack(){
		return stack;
	}

	/**
	 *
	 */
	public boolean equals(Object o){
		if (!(o instanceof Frame)) return false; // implies "null" is non-equal.
		Frame f = (Frame) o;
		return this.stack.equals(f.stack) && this.locals.equals(f.locals);
	}

	/**
	 * Returns a String representation of the Frame instance.
	 */
	public String toString(){
		String s="Local Variables:\n";
		s += locals;
		s += "OperandStack:\n";
		s += stack;
		return s;
	}
}