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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.optimize.peephole;
import proguard.classfile.*;
import proguard.classfile.util.*;
import proguard.classfile.visitor.*;
import proguard.optimize.KeepMarker;
/**
* This <code>MemberVisitor</code> makes the program methods that it visits
* final, if possible.
*
* @author Eric Lafortune
*/
public class MethodFinalizer
extends SimplifiedVisitor
implements MemberVisitor
{
private final MemberVisitor extraMemberVisitor;
private final MemberFinder memberFinder = new MemberFinder();
/**
* Creates a new ClassFinalizer.
*/
public MethodFinalizer()
{
this(null);
}
/**
* Creates a new ClassFinalizer.
* @param extraMemberVisitor an optional extra visitor for all finalized
* methods.
*/
public MethodFinalizer(MemberVisitor extraMemberVisitor)
{
this.extraMemberVisitor = extraMemberVisitor;
}
// Implementations for MemberVisitor.
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
String name = programMethod.getName(programClass);
// If the method is not already private/static/final/abstract,
// and it is not a constructor,
// and its class is final,
// or it is not being kept and it is not overridden,
// then make it final.
if ((programMethod.u2accessFlags & (ClassConstants.INTERNAL_ACC_PRIVATE |
ClassConstants.INTERNAL_ACC_STATIC |
ClassConstants.INTERNAL_ACC_FINAL |
ClassConstants.INTERNAL_ACC_ABSTRACT)) == 0 &&
!name.equals(ClassConstants.INTERNAL_METHOD_NAME_INIT) &&
((programClass.u2accessFlags & ClassConstants.INTERNAL_ACC_FINAL) != 0 ||
(!KeepMarker.isKept(programMethod) &&
(programClass.subClasses == null ||
!memberFinder.isOverriden(programClass, programMethod)))))
{
programMethod.u2accessFlags |= ClassConstants.INTERNAL_ACC_FINAL;
// Visit the method, if required.
if (extraMemberVisitor != null)
{
extraMemberVisitor.visitProgramMethod(programClass, programMethod);
}
}
}
}
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