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Java > Open Source Codes > com > sun > org > apache > bcel > internal > classfile > StackMapEntry


1 package com.sun.org.apache.bcel.internal.classfile;
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 com.sun.org.apache.bcel.internal.Constants;
58 import java.io.*;
59
60 /**
61  * This class represents a stack map entry recording the types of
62  * local variables and the the of stack items at a given byte code offset.
63  * See CLDC specification &#247;5.3.1.2
64  *
65  * @version $Id: StackMapEntry.java,v 1.1.1.1 2001/10/29 20:00:03 jvanzyl Exp $
66  * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
67  * @see StackMap
68  * @see StackMapType
69  */

70 public final class StackMapEntry implements Cloneable JavaDoc {
71   private int byte_code_offset;
72   private int number_of_locals;
73   private StackMapType[] types_of_locals;
74   private int number_of_stack_items;
75   private StackMapType[] types_of_stack_items;
76   private ConstantPool constant_pool;
77
78   /**
79    * Construct object from file stream.
80    * @param file Input stream
81    * @throw IOException
82    */

83   StackMapEntry(DataInputStream file, ConstantPool constant_pool) throws IOException
84   {
85     this(file.readShort(), file.readShort(), null, -1, null, constant_pool);
86
87     types_of_locals = new StackMapType[number_of_locals];
88     for(int i=0; i < number_of_locals; i++)
89       types_of_locals[i] = new StackMapType(file, constant_pool);
90
91     number_of_stack_items = file.readShort();
92     types_of_stack_items = new StackMapType[number_of_stack_items];
93     for(int i=0; i < number_of_stack_items; i++)
94       types_of_stack_items[i] = new StackMapType(file, constant_pool);
95   }
96
97   public StackMapEntry(int byte_code_offset, int number_of_locals,
98                StackMapType[] types_of_locals,
99                int number_of_stack_items,
100                StackMapType[] types_of_stack_items,
101                ConstantPool constant_pool) {
102     this.byte_code_offset = byte_code_offset;
103     this.number_of_locals = number_of_locals;
104     this.types_of_locals = types_of_locals;
105     this.number_of_stack_items = number_of_stack_items;
106     this.types_of_stack_items = types_of_stack_items;
107     this.constant_pool = constant_pool;
108   }
109
110   /**
111    * Dump stack map entry
112    *
113    * @param file Output file stream
114    * @throw IOException
115    */

116   public final void dump(DataOutputStream file) throws IOException
117   {
118     file.writeShort(byte_code_offset);
119
120     file.writeShort(number_of_locals);
121     for(int i=0; i < number_of_locals; i++)
122       types_of_locals[i].dump(file);
123
124     file.writeShort(number_of_stack_items);
125     for(int i=0; i < number_of_stack_items; i++)
126       types_of_stack_items[i].dump(file);
127   }
128
129   /**
130    * @return String representation.
131    */

132   public final String JavaDoc toString() {
133     StringBuffer JavaDoc buf = new StringBuffer JavaDoc("(offset=" + byte_code_offset);
134
135     if(number_of_locals > 0) {
136       buf.append(", locals={");
137
138       for(int i=0; i < number_of_locals; i++) {
139     buf.append(types_of_locals[i]);
140     if(i < number_of_locals - 1)
141       buf.append(", ");
142       }
143
144       buf.append("}");
145     }
146
147     if(number_of_stack_items > 0) {
148       buf.append(", stack items={");
149
150       for(int i=0; i < number_of_stack_items; i++) {
151     buf.append(types_of_stack_items[i]);
152     if(i < number_of_stack_items - 1)
153       buf.append(", ");
154       }
155
156       buf.append("}");
157     }
158
159     buf.append(")");
160
161     return buf.toString();
162   }
163
164
165   public void setByteCodeOffset(int b) { byte_code_offset = b; }
166   public int getByteCodeOffset() { return byte_code_offset; }
167   public void setNumberOfLocals(int n) { number_of_locals = n; }
168   public int getNumberOfLocals() { return number_of_locals; }
169   public void setTypesOfLocals(StackMapType[] t) { types_of_locals = t; }
170   public StackMapType[] getTypesOfLocals() { return types_of_locals; }
171   public void setNumberOfStackItems(int n) { number_of_stack_items = n; }
172   public int getNumberOfStackItems() { return number_of_stack_items; }
173   public void setTypesOfStackItems(StackMapType[] t) { types_of_stack_items = t; }
174   public StackMapType[] getTypesOfStackItems() { return types_of_stack_items; }
175
176   /**
177    * @return deep copy of this object
178    */

179   public StackMapEntry copy() {
180     try {
181       return (StackMapEntry)clone();
182     } catch(CloneNotSupportedException JavaDoc e) {}
183
184     return null;
185   }
186
187   /**
188    * Called by objects that are traversing the nodes of the tree implicitely
189    * defined by the contents of a Java class. I.e., the hierarchy of methods,
190    * fields, attributes, etc. spawns a tree of objects.
191    *
192    * @param v Visitor object
193    */

194   public void accept(Visitor v) {
195     v.visitStackMapEntry(this);
196   }
197
198   /**
199    * @return Constant pool used by this object.
200    */

201   public final ConstantPool getConstantPool() { return constant_pool; }
202
203   /**
204    * @param constant_pool Constant pool to be used for this object.
205    */

206   public final void setConstantPool(ConstantPool constant_pool) {
207     this.constant_pool = constant_pool;
208   }
209 }
210
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