1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  *             of Java bytecode.
4  *
5  * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.classfile.attribute;
22 
23 import proguard.classfile.*;
24 import proguard.classfile.visitor.ClassVisitor;
25 
26 /**
27  * Representation of an Local Variable table entry.
28  *
29  * @author Eric Lafortune
30  */
31 public class LocalVariableInfo implements VisitorAccepter, Comparable
32 {
33     public int u2startPC;
34     public int u2length;
35     public int u2nameIndex;
36     public int u2descriptorIndex;
37     public int u2index;
38 
39     /**
40      * An extra field pointing to the referenced Clazz object.
41      * This field is typically filled out by the <code>{@link
42      * proguard.classfile.util.ClassReferenceInitializer
43      * ClassReferenceInitializer}</code>.
44      */
45     public Clazz referencedClass;
46 
47     /**
48      * An extra field in which visitors can store information.
49      */
50     public Object visitorInfo;
51 
52 
53     /**
54      * Creates an uninitialized LocalVariableInfo.
55      */
LocalVariableInfo()56     public LocalVariableInfo()
57     {
58     }
59 
60 
61     /**
62      * Creates an initialized LocalVariableInfo.
63      */
LocalVariableInfo(int u2startPC, int u2length, int u2nameIndex, int u2descriptorIndex, int u2index)64     public LocalVariableInfo(int   u2startPC,
65                              int   u2length,
66                              int   u2nameIndex,
67                              int   u2descriptorIndex,
68                              int   u2index)
69     {
70         this.u2startPC         = u2startPC;
71         this.u2length          = u2length;
72         this.u2nameIndex       = u2nameIndex;
73         this.u2descriptorIndex = u2descriptorIndex;
74         this.u2index           = u2index;
75     }
76 
77 
78     /**
79      * Returns the name.
80      */
getName(Clazz clazz)81     public String getName(Clazz clazz)
82     {
83         return clazz.getString(u2nameIndex);
84     }
85 
86 
87     /**
88      * Returns the descriptor.
89      */
getDescriptor(Clazz clazz)90     public String getDescriptor(Clazz clazz)
91     {
92         return clazz.getString(u2descriptorIndex);
93     }
94 
95 
96     /**
97      * Lets the referenced class accept the given visitor.
98      */
referencedClassAccept(ClassVisitor classVisitor)99     public void referencedClassAccept(ClassVisitor classVisitor)
100     {
101         if (referencedClass != null)
102         {
103             referencedClass.accept(classVisitor);
104         }
105     }
106 
107 
108     // Implementations for VisitorAccepter.
109 
getVisitorInfo()110     public Object getVisitorInfo()
111     {
112         return visitorInfo;
113     }
114 
setVisitorInfo(Object visitorInfo)115     public void setVisitorInfo(Object visitorInfo)
116     {
117         this.visitorInfo = visitorInfo;
118     }
119 
120 
121     // Implementations for Comparable.
122 
compareTo(Object object)123     public int compareTo(Object object)
124     {
125         LocalVariableInfo other = (LocalVariableInfo)object;
126 
127         return
128             this.u2startPC          < other.u2startPC          ? -1 : this.u2startPC          > other.u2startPC          ? 1 :
129             this.u2index            < other.u2index            ? -1 : this.u2index            > other.u2index            ? 1 :
130             this.u2length           < other.u2length           ? -1 : this.u2length           > other.u2length           ? 1 :
131             this.u2descriptorIndex  < other.u2descriptorIndex  ? -1 : this.u2descriptorIndex  > other.u2descriptorIndex  ? 1 :
132             this.u2nameIndex        < other.u2nameIndex        ? -1 : this.u2nameIndex        > other.u2nameIndex        ? 1 :
133                                                                                                                            0;
134     }
135 }
136