1 package org.apache.bcel.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 org.apache.bcel.Constants;
58 import java.io.*;
59
60 /***
61 * This class represents the type of a local variable or item on stack
62 * used in the StackMap entries.
63 *
64 * @version $Id: StackMapType.java,v 1.2 2002/03/11 16:16:35 mdahm Exp $
65 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
66 * @see StackMapEntry
67 * @see StackMap
68 * @see Constants
69 */
70 public final class StackMapType implements Cloneable {
71 private byte type;
72 private int index = -1; // Index to CONSTANT_Class or offset
73 private ConstantPool constant_pool;
74
75 /***
76 * Construct object from file stream.
77 * @param file Input stream
78 * @throws IOException
79 */
80 StackMapType(DataInputStream file, ConstantPool constant_pool) throws IOException
81 {
82 this(file.readByte(), -1, constant_pool);
83
84 if(hasIndex())
85 setIndex(file.readShort());
86
87 setConstantPool(constant_pool);
88 }
89
90 /***
91 * @param type type tag as defined in the Constants interface
92 * @param index index to constant pool, or byte code offset
93 */
94 public StackMapType(byte type, int index, ConstantPool constant_pool) {
95 setType(type);
96 setIndex(index);
97 setConstantPool(constant_pool);
98 }
99
100 public void setType(byte t) {
101 if((t < Constants.ITEM_Bogus) || (t > Constants.ITEM_NewObject))
102 throw new RuntimeException("Illegal type for StackMapType: " + t);
103 type = t;
104 }
105
106 public byte getType() { return type; }
107 public void setIndex(int t) { index = t; }
108
109 /*** @return index to constant pool if type == ITEM_Object, or offset
110 * in byte code, if type == ITEM_NewObject, and -1 otherwise
111 */
112 public int getIndex() { return index; }
113
114 /***
115 * Dump type entries to file.
116 *
117 * @param file Output file stream
118 * @throws IOException
119 */
120 public final void dump(DataOutputStream file) throws IOException
121 {
122 file.writeByte(type);
123 if(hasIndex())
124 file.writeShort(getIndex());
125 }
126
127 /*** @return true, if type is either ITEM_Object or ITEM_NewObject
128 */
129 public final boolean hasIndex() {
130 return ((type == Constants.ITEM_Object) ||
131 (type == Constants.ITEM_NewObject));
132 }
133
134 private String printIndex() {
135 if(type == Constants.ITEM_Object)
136 return ", class=" + constant_pool.constantToString(index, Constants.CONSTANT_Class);
137 else if(type == Constants.ITEM_NewObject)
138 return ", offset=" + index;
139 else
140 return "";
141 }
142
143 /***
144 * @return String representation
145 */
146 public final String toString() {
147 return "(type=" + Constants.ITEM_NAMES[type] + printIndex() + ")";
148 }
149
150 /***
151 * @return deep copy of this object
152 */
153 public StackMapType copy() {
154 try {
155 return (StackMapType)clone();
156 } catch(CloneNotSupportedException e) {}
157
158 return null;
159 }
160
161 /***
162 * @return Constant pool used by this object.
163 */
164 public final ConstantPool getConstantPool() { return constant_pool; }
165
166 /***
167 * @param constant_pool Constant pool to be used for this object.
168 */
169 public final void setConstantPool(ConstantPool constant_pool) {
170 this.constant_pool = constant_pool;
171 }
172 }
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