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.VisitorAccepter;
24 
25 /**
26  * Representation of an Exception table entry.
27  *
28  * @author Eric Lafortune
29  */
30 public class ExceptionInfo implements VisitorAccepter
31 {
32     public int u2startPC;
33     public int u2endPC;
34     public int u2handlerPC;
35     public int u2catchType;
36 
37     /**
38      * An extra field in which visitors can store information.
39      */
40     public Object visitorInfo;
41 
42 
43     /**
44      * Creates an uninitialized ExceptionInfo.
45      */
ExceptionInfo()46     public ExceptionInfo()
47     {
48         this(0, 0, 0, 0);
49     }
50 
51 
52     /**
53      * Creates an ExceptionInfo with the given properties.
54      */
ExceptionInfo(int u2startPC, int u2endPC, int u2handlerPC, int u2catchType)55     public ExceptionInfo(int u2startPC,
56                          int u2endPC,
57                          int u2handlerPC,
58                          int u2catchType)
59     {
60         this.u2startPC   = u2startPC;
61         this.u2endPC     = u2endPC;
62         this.u2handlerPC = u2handlerPC;
63         this.u2catchType = u2catchType;
64     }
65 
66 
67     /**
68      * Returns whether the exception's try block contains the instruction at the
69      * given offset.
70      */
isApplicable(int instructionOffset)71     public boolean isApplicable(int instructionOffset)
72     {
73         return instructionOffset >= u2startPC &&
74                instructionOffset <  u2endPC;
75     }
76 
77 
78     /**
79      * Returns whether the exception's try block overlaps with the specified
80      * block of instructions.
81      */
isApplicable(int startOffset, int endOffset)82     public boolean isApplicable(int startOffset, int endOffset)
83     {
84         return u2startPC < endOffset &&
85                u2endPC   > startOffset;
86     }
87 
88 
89     // Implementations for VisitorAccepter.
90 
getVisitorInfo()91     public Object getVisitorInfo()
92     {
93         return visitorInfo;
94     }
95 
setVisitorInfo(Object visitorInfo)96     public void setVisitorInfo(Object visitorInfo)
97     {
98         this.visitorInfo = visitorInfo;
99     }
100 }
101