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Java > Open Source Codes > proguard > evaluation > BranchUnit


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 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.evaluation;
22
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.*;
25 import proguard.evaluation.value.*;
26
27 /**
28  * This InstructionVisitor evaluates the instructions that it visits.
29  *
30  * @author Eric Lafortune
31  */
32 public interface BranchUnit
33 {
34     /**
35      * Sets the new instruction offset.
36      */
37     public void branch(Clazz clazz,
38                        CodeAttribute codeAttribute,
39                        int offset,
40                        int branchTarget);
41
42
43     /**
44      * Sets the new instruction offset, depending on the certainty of the
45      * conditional branch.
46      */
47     public void branchConditionally(Clazz clazz,
48                                     CodeAttribute codeAttribute,
49                                     int offset,
50                                     int branchTarget,
51                                     int conditional);
52
53
54     /**
55      * Returns from the method with the given value.
56      */
57     public void returnFromMethod();
58
59
60     /**
61      * Handles the throwing of an exception.
62      */
63     public void throwException();
64 }
65
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