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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