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    1   package org.apache.bcel.verifier.structurals;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache BCEL" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    "Apache BCEL", nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import org.apache.bcel.generic.*;
    58  import org.apache.bcel.verifier.exc.*;
    59  import java.util.ArrayList;
    60
    61  /***
    62   * This class represents a JVM execution frame; that means,
    63   * a local variable array and an operand stack.
    64   *
    65   * @version $Id: Frame.java,v 1.1.1.1 2001/10/29 20:00:39 jvanzyl Exp $
    66   * @author <A HREF="http://www.inf.fu-berlin.de/~ehaase"/>Enver Haase</A>
    67   */
    68
    69  public class Frame{
    70
    71  	/***
    72  	 * For instance initialization methods, it is important to remember
    73  	 * which instance it is that is not initialized yet. It will be
    74  	 * initialized invoking another constructor later.
    75  	 * NULL means the instance already *is* initialized.
    76  	 */
    77  	protected static UninitializedObjectType _this;
    78
    79  	/***
    80  	 *
    81  	 */
    82  	private LocalVariables locals;
    83
    84  	/***
    85  	 *
    86  	 */
    87  	private OperandStack stack;
    88
    89  	/***
    90  	 *
    91  	 */
    92  	public Frame(int maxLocals, int maxStack){
    93  		locals = new LocalVariables(maxLocals);
    94  		stack = new OperandStack(maxStack);
    95  	}
    96
    97  	/***
    98  	 *
    99  	 */
    100 	public Frame(LocalVariables locals, OperandStack stack){
    101 		this.locals = locals;
    102 		this.stack = stack;
    103 	}
    104
    105 	/***
    106 	 *
    107 	 */
    108 	protected Object clone(){
    109 		Frame f = new Frame(locals.getClone(), stack.getClone());
    110 		return f;
    111 	}
    112
    113 	/***
    114 	 *
    115 	 */
    116 	public Frame getClone(){
    117 		return (Frame) clone();
    118 	}
    119
    120 	/***
    121 	 *
    122 	 */
    123 	public LocalVariables getLocals(){
    124 		return locals;
    125 	}
    126
    127 	/***
    128 	 *
    129 	 */
    130 	public OperandStack getStack(){
    131 		return stack;
    132 	}
    133
    134 	/***
    135 	 *
    136 	 */
    137 	public boolean equals(Object o){
    138 		if (!(o instanceof Frame)) return false; // implies "null" is non-equal.
    139 		Frame f = (Frame) o;
    140 		return this.stack.equals(f.stack) && this.locals.equals(f.locals);
    141 	}
    142
    143 	/***
    144 	 * Returns a String representation of the Frame instance.
    145 	 */
    146 	public String toString(){
    147 		String s="Local Variables:\n";
    148 		s += locals;
    149 		s += "OperandStack:\n";
    150 		s += stack;
    151 		return s;
    152 	}
    153 }

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