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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.classfile.editor;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.*;
import proguard.classfile.util.SimplifiedVisitor;
/**
* This AttributeVisitor adds the line numbers of all line number attributes
* that it visits to the given target line number attribute. It ensures that
* the sources of the line numbers are preserved or set.
*/
public class LineNumberInfoAdder
extends SimplifiedVisitor
implements AttributeVisitor,
LineNumberInfoVisitor
{
private final LineNumberTableAttributeEditor lineNumberTableAttributeEditor;
private String source;
/**
* Creates a new LineNumberInfoAdder that will copy line numbers into the
* given target line number table.
*/
public LineNumberInfoAdder(LineNumberTableAttribute targetLineNumberTableAttribute)
{
this.lineNumberTableAttributeEditor = new LineNumberTableAttributeEditor(targetLineNumberTableAttribute);
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitLineNumberTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberTableAttribute lineNumberTableAttribute)
{
// Remember the source.
source =
clazz.getName() + '.' +
method.getName(clazz) +
method.getDescriptor(clazz) + ':' +
lineNumberTableAttribute.getLowestLineNumber() + ':' +
lineNumberTableAttribute.getHighestLineNumber();
// Copy all line numbers.
lineNumberTableAttribute.lineNumbersAccept(clazz, method, codeAttribute, this);
}
// Implementations for LineNumberInfoVisitor.
public void visitLineNumberInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberInfo lineNumberInfo)
{
// Make sure we have a source.
String newSource = lineNumberInfo.getSource() != null ?
lineNumberInfo.getSource() :
source;
// Create a new line number.
LineNumberInfo newLineNumberInfo =
new ExtendedLineNumberInfo(lineNumberInfo.u2startPC,
lineNumberInfo.u2lineNumber,
newSource);
// Add it to the target.
lineNumberTableAttributeEditor.addLineNumberInfo(newLineNumberInfo);
}
}
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