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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;
import proguard.classfile.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.editor.MethodInvocationFixer;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.MemberVisitor;
import proguard.optimize.info.ParameterUsageMarker;
import proguard.optimize.peephole.VariableShrinker;
/**
* This MemberVisitor makes all methods that it visits static, if their 'this'
* parameters are unused.
*
* @see ParameterUsageMarker
* @see MethodInvocationFixer
* @see VariableShrinker
* @author Eric Lafortune
*/
public class MethodStaticizer
extends SimplifiedVisitor
implements MemberVisitor,
AttributeVisitor
{
private final MemberVisitor extraStaticMemberVisitor;
/**
* Creates a new MethodStaticizer.
*/
public MethodStaticizer()
{
this(null);
}
/**
* Creates a new MethodStaticizer with an extra visitor.
* @param extraStaticMemberVisitor an optional extra visitor for all
* methods that have been made static.
*/
public MethodStaticizer(MemberVisitor extraStaticMemberVisitor)
{
this.extraStaticMemberVisitor = extraStaticMemberVisitor;
}
// Implementations for MemberVisitor.
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
// Is the 'this' parameter being used?
if (!ParameterUsageMarker.isParameterUsed(programMethod, 0))
{
// Make the method static.
programMethod.u2accessFlags =
(programMethod.getAccessFlags() & ~ClassConstants.INTERNAL_ACC_FINAL) |
ClassConstants.INTERNAL_ACC_STATIC;
// Visit the method, if required.
if (extraStaticMemberVisitor != null)
{
extraStaticMemberVisitor.visitProgramMethod(programClass, programMethod);
}
}
}
}
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