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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 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.util.MethodLinker;
import proguard.classfile.visitor.*;
import proguard.optimize.info.NoSideEffectMethodMarker;
/**
* This <code>ClassVisitor</code> and <code>MemberVisitor</code>
* marks classes and class members it visits. The marked elements
* will remain unchanged as necessary in the optimization step.
*
* @see NoSideEffectMethodMarker
* @author Eric Lafortune
*/
public class KeepMarker
implements ClassVisitor,
MemberVisitor
{
// A visitor info flag to indicate the visitor accepter is being kept.
private static final Object KEPT = new Object();
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
markAsKept(programClass);
}
public void visitLibraryClass(LibraryClass libraryClass)
{
markAsKept(libraryClass);
}
// Implementations for MemberVisitor.
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
markAsKept(programField);
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
markAsKept(MethodLinker.lastMember(programMethod));
}
public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
{
markAsKept(libraryField);
}
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
{
markAsKept(MethodLinker.lastMember(libraryMethod));
}
// Small utility methods.
private static void markAsKept(VisitorAccepter visitorAccepter)
{
visitorAccepter.setVisitorInfo(KEPT);
}
public static boolean isKept(VisitorAccepter visitorAccepter)
{
// We're also checking for the constant in NoSideEffectMethodMarker,
// to keep things simple.
Object visitorInfo =
MethodLinker.lastVisitorAccepter(visitorAccepter).getVisitorInfo();
return visitorInfo == KEPT ||
visitorInfo == NoSideEffectMethodMarker.KEPT_BUT_NO_SIDE_EFFECTS;
}
}
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