1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 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 */
21package proguard.evaluation;
22
23import proguard.classfile.Clazz;
24import proguard.classfile.attribute.CodeAttribute;
25
26/**
27 * This InstructionVisitor evaluates the instructions that it visits.
28 *
29 * @author Eric Lafortune
30 */
31public interface BranchUnit
32{
33    /**
34     * Sets the new instruction offset.
35     */
36    public void branch(Clazz         clazz,
37                       CodeAttribute codeAttribute,
38                       int           offset,
39                       int           branchTarget);
40
41
42    /**
43     * Sets the new instruction offset, depending on the certainty of the
44     * conditional branch.
45     */
46    public void branchConditionally(Clazz         clazz,
47                                    CodeAttribute codeAttribute,
48                                    int           offset,
49                                    int           branchTarget,
50                                    int           conditional);
51
52
53    /**
54     * Returns from the method with the given value.
55     */
56    public void returnFromMethod();
57
58
59    /**
60     * Handles the throwing of an exception.
61     */
62    public void throwException();
63}
64