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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.attribute;
import proguard.classfile.*;
import proguard.classfile.attribute.visitor.*;
/**
* This Attribute represents a line number table attribute.
*
* @author Eric Lafortune
*/
public class LineNumberTableAttribute extends Attribute
{
public int u2lineNumberTableLength;
public LineNumberInfo[] lineNumberTable;
/**
* Creates an uninitialized LineNumberTableAttribute.
*/
public LineNumberTableAttribute()
{
}
/**
* Creates an initialized LineNumberTableAttribute.
*/
public LineNumberTableAttribute(int u2attributeNameIndex,
int u2lineNumberTableLength,
LineNumberInfo[] lineNumberTable)
{
super(u2attributeNameIndex);
this.u2lineNumberTableLength = u2lineNumberTableLength;
this.lineNumberTable = lineNumberTable;
}
/**
* Returns the line number corresponding to the given byte code program
* counter.
*/
public int getLineNumber(int pc)
{
LineNumberInfo info = getLineNumberInfo(pc);
return info == null ? 0 : info.u2lineNumber;
}
/**
* Returns the source corresponding to the given byte code program
* counter.
*/
public String getSource(int pc)
{
LineNumberInfo info = getLineNumberInfo(pc);
return info == null ? null : info.getSource();
}
/**
* Returns the line number info corresponding to the given byte code
* program counter.
*/
public LineNumberInfo getLineNumberInfo(int pc)
{
for (int index = u2lineNumberTableLength-1; index >= 0; index--)
{
LineNumberInfo info = lineNumberTable[index];
if (pc >= info.u2startPC)
{
return info;
}
}
return u2lineNumberTableLength > 0 ?
lineNumberTable[0] :
null;
}
/**
* Returns the lowest line number with the default null source,
* or 0 if there aren't any such line numbers.
*/
public int getLowestLineNumber()
{
int lowestLineNumber = Integer.MAX_VALUE;
for (int index = 0; index < u2lineNumberTableLength; index++)
{
LineNumberInfo info = lineNumberTable[index];
if (info.getSource() == null)
{
int lineNumber = info.u2lineNumber;
if (lineNumber < lowestLineNumber)
{
lowestLineNumber = lineNumber;
}
}
}
return lowestLineNumber == Integer.MAX_VALUE ? 0 : lowestLineNumber;
}
/**
* Returns the highest line number with the default null source,
* or 0 if there aren't any such line numbers.
*/
public int getHighestLineNumber()
{
int highestLineNumber = 0;
for (int index = 0; index < u2lineNumberTableLength; index++)
{
LineNumberInfo info = lineNumberTable[index];
if (info.getSource() == null)
{
int lineNumber = info.u2lineNumber;
if (lineNumber > highestLineNumber)
{
highestLineNumber = lineNumber;
}
}
}
return highestLineNumber;
}
// Implementations for Attribute.
public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, AttributeVisitor attributeVisitor)
{
attributeVisitor.visitLineNumberTableAttribute(clazz, method, codeAttribute, this);
}
/**
* Applies the given visitor to all line numbers.
*/
public void lineNumbersAccept(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberInfoVisitor lineNumberInfoVisitor)
{
for (int index = 0; index < u2lineNumberTableLength; index++)
{
// We don't need double dispatching here, since there is only one
// type of LineNumberInfo.
lineNumberInfoVisitor.visitLineNumberInfo(clazz, method, codeAttribute, lineNumberTable[index]);
}
}
}
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