LocalVariableInfoAdder.java revision b9cc48a43ed984587c939d02fba5316bf5c0df6e 
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.attribute.visitor.LocalVariableInfoVisitor;
24import proguard.classfile.attribute.*;
25import proguard.classfile.*;
26
27/**
28 * This LocalVariableInfoVisitor adds all line numbers that it visits to the given
29 * target line number attribute.
30 */
31public class LocalVariableInfoAdder
32implements   LocalVariableInfoVisitor
33{
34    private final ConstantAdder                     constantAdder;
35    private final LocalVariableTableAttributeEditor localVariableTableAttributeEditor;
36
37
38    /**
39     * Creates a new LocalVariableInfoAdder that will copy line numbers into the
40     * given target line number table.
41     */
42    public LocalVariableInfoAdder(ProgramClass                targetClass,
43                                  LocalVariableTableAttribute targetLocalVariableTableAttribute)
44    {
45        this.constantAdder                     = new ConstantAdder(targetClass);
46        this.localVariableTableAttributeEditor = new LocalVariableTableAttributeEditor(targetLocalVariableTableAttribute);
47    }
48
49
50    // Implementations for LocalVariableInfoVisitor.
51
52    public void visitLocalVariableInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableInfo localVariableInfo)
53    {
54        // Create a new line number.
55        LocalVariableInfo newLocalVariableInfo =
56            new LocalVariableInfo(localVariableInfo.u2startPC,
57                                  localVariableInfo.u2length,
58                                  constantAdder.addConstant(clazz, localVariableInfo.u2nameIndex),
59                                  constantAdder.addConstant(clazz, localVariableInfo.u2descriptorIndex),
60                                  localVariableInfo.u2index);
61
62        newLocalVariableInfo.referencedClass = localVariableInfo.referencedClass;
63
64        // Add it to the target.
65        localVariableTableAttributeEditor.addLocalVariableInfo(newLocalVariableInfo);
66    }
67}