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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
*
* 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.optimize.peephole;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.*;
import proguard.classfile.constant.ClassConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.ClassVisitor;
import java.util.Arrays;
/**
* This ClassVisitor removes InnerClasses and EnclosingMethod attributes in
* classes that are retargeted or that refer to classes that are retargeted.
*
* @see ClassMerger
* @author Eric Lafortune
*/
public class RetargetedInnerClassAttributeRemover
extends SimplifiedVisitor
implements ClassVisitor,
AttributeVisitor,
InnerClassesInfoVisitor,
ConstantVisitor
{
private boolean retargeted;
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
int attributesCount = programClass.u2attributesCount;
Attribute[] attributes = programClass.attributes;
int newAtributesCount = 0;
// Copy over all non-retargeted attributes.
for (int index = 0; index < attributesCount; index++)
{
Attribute attribute = attributes[index];
// Check if it's an InnerClasses or EnclosingMethod attribute in
// a retargeted class or referring to a retargeted class.
retargeted = false;
attribute.accept(programClass, this);
if (!retargeted)
{
attributes[newAtributesCount++] = attribute;
}
}
// Clean up any remaining array elements.
Arrays.fill(attributes, newAtributesCount, attributesCount, null);
// Update the number of attributes.
programClass.u2attributesCount = newAtributesCount;
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitInnerClassesAttribute(Clazz clazz, InnerClassesAttribute innerClassesAttribute)
{
// Check whether the class itself is retargeted.
checkTarget(clazz);
if (!retargeted)
{
// Check whether the referenced classes are retargeted.
innerClassesAttribute.innerClassEntriesAccept(clazz, this);
int classesCount = innerClassesAttribute.u2classesCount;
InnerClassesInfo[] classes = innerClassesAttribute.classes;
int newClassesCount = 0;
// Copy over all non-retargeted attributes.
for (int index = 0; index < classesCount; index++)
{
InnerClassesInfo classInfo = classes[index];
// Check if the outer class or inner class is a retargeted class.
retargeted = false;
classInfo.outerClassConstantAccept(clazz, this);
classInfo.innerClassConstantAccept(clazz, this);
if (!retargeted)
{
classes[newClassesCount++] = classInfo;
}
}
// Clean up any remaining array elements.
Arrays.fill(classes, newClassesCount, classesCount, null);
// Update the number of classes.
innerClassesAttribute.u2classesCount = newClassesCount;
// Remove the attribute altogether if it's empty.
retargeted = newClassesCount == 0;
}
}
public void visitEnclosingMethodAttribute(Clazz clazz, EnclosingMethodAttribute enclosingMethodAttribute)
{
// Check whether the class itself is retargeted.
checkTarget(clazz);
// Check whether the referenced class is retargeted.
checkTarget(enclosingMethodAttribute.referencedClass);
}
// Implementations for InnerClassesInfoVisitor.
public void visitInnerClassesInfo(Clazz clazz, InnerClassesInfo innerClassesInfo)
{
// Check whether the inner class or the outer class are retargeted.
innerClassesInfo.innerClassConstantAccept(clazz, this);
innerClassesInfo.outerClassConstantAccept(clazz, this);
}
// Implementations for ConstantVisitor.
public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
{
// Check whether the referenced class is retargeted.
checkTarget(classConstant.referencedClass);
}
// Small utility methods.
/**
* Sets the global return value to true if the given class is retargeted.
*/
private void checkTarget(Clazz clazz)
{
if (clazz != null &&
ClassMerger.getTargetClass(clazz) != null)
{
retargeted = true;
}
}
}
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