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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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