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.classfile.editor;
22
23import proguard.classfile.*;
24import proguard.classfile.attribute.*;
25import proguard.classfile.attribute.visitor.*;
26import proguard.classfile.util.SimplifiedVisitor;
27
28/**
29 * This AttributeVisitor computes and updates the maximum stack size of the
30 * code attributes that it visits.
31 *
32 * @author Eric Lafortune
33 */
34public class StackSizeUpdater
35extends      SimplifiedVisitor
36implements   AttributeVisitor
37{
38    private final StackSizeComputer stackSizeComputer = new StackSizeComputer();
39
40
41    // Implementations for AttributeVisitor.
42
43    public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
44
45
46    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
47    {
48        // Compute the stack sizes.
49        stackSizeComputer.visitCodeAttribute(clazz, method, codeAttribute);
50
51        // Update the maximum stack size.
52        codeAttribute.u2maxStack = stackSizeComputer.getMaxStackSize();
53    }
54}
55