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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2009 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.obfuscate;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.ClassVisitor;
/**
* This ClassVisitor marks all NameAndType constant pool entries that are
* being used in the program classes it visits.
*
* @see NameAndTypeShrinker
*
* @author Eric Lafortune
*/
public class NameAndTypeUsageMarker
extends SimplifiedVisitor
implements ClassVisitor,
ConstantVisitor,
AttributeVisitor
{
// A visitor info flag to indicate the NameAndType constant pool entry is being used.
private static final Object USED = new Object();
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
// Mark the NameAndType entries referenced by all other constant pool
// entries.
programClass.constantPoolEntriesAccept(this);
// Mark the NameAndType entries referenced by all EnclosingMethod
// attributes.
programClass.attributesAccept(this);
}
// Implementations for ConstantVisitor.
public void visitAnyConstant(Clazz clazz, Constant constant) {}
public void visitFieldrefConstant(Clazz clazz, FieldrefConstant fieldrefConstant)
{
visitRefConstant(clazz, fieldrefConstant);
}
public void visitInterfaceMethodrefConstant(Clazz clazz, InterfaceMethodrefConstant interfaceMethodrefConstant)
{
visitRefConstant(clazz, interfaceMethodrefConstant);
}
public void visitMethodrefConstant(Clazz clazz, MethodrefConstant methodrefConstant)
{
visitRefConstant(clazz, methodrefConstant);
}
private void visitRefConstant(Clazz clazz, RefConstant refConstant)
{
markNameAndTypeConstant(clazz, refConstant.u2nameAndTypeIndex);
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitEnclosingMethodAttribute(Clazz clazz, EnclosingMethodAttribute enclosingMethodAttribute)
{
if (enclosingMethodAttribute.u2nameAndTypeIndex != 0)
{
markNameAndTypeConstant(clazz, enclosingMethodAttribute.u2nameAndTypeIndex);
}
}
// Small utility methods.
/**
* Marks the given UTF-8 constant pool entry of the given class.
*/
private void markNameAndTypeConstant(Clazz clazz, int index)
{
markAsUsed((NameAndTypeConstant)((ProgramClass)clazz).getConstant(index));
}
/**
* Marks the given VisitorAccepter as being used.
* In this context, the VisitorAccepter will be a NameAndTypeConstant object.
*/
private static void markAsUsed(VisitorAccepter visitorAccepter)
{
visitorAccepter.setVisitorInfo(USED);
}
/**
* Returns whether the given VisitorAccepter has been marked as being used.
* In this context, the VisitorAccepter will be a NameAndTypeConstant object.
*/
static boolean isUsed(VisitorAccepter visitorAccepter)
{
return visitorAccepter.getVisitorInfo() == USED;
}
}
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