1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2009 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.*;
24import proguard.classfile.attribute.CodeAttribute;
25import proguard.classfile.instruction.ConstantInstruction;
26import proguard.evaluation.value.Value;
27
28/**
29 * This interface sets up the variables for entering a method,
30 * and it updates the stack for the invocation of a class member.
31 *
32 * @author Eric Lafortune
33 */
34public interface InvocationUnit
35{
36    /**
37     * Sets up the given variables for entering the given method.
38     */
39    public void enterMethod(Clazz     clazz,
40                            Method    method,
41                            Variables variables);
42
43
44    /**
45     * Exits the given method with the given return value.
46     */
47    public void exitMethod(Clazz  clazz,
48                           Method method,
49                           Value  returnValue);
50
51
52    /**
53     * Updates the given stack corresponding to the execution of the given
54     * field or method reference instruction.
55     */
56    public void invokeMember(Clazz               clazz,
57                             Method              method,
58                             CodeAttribute       codeAttribute,
59                             int                 offset,
60                             ConstantInstruction constantInstruction,
61                             Stack               stack);
62}
63