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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.info;
import proguard.classfile.*;
import proguard.classfile.util.*;
import proguard.classfile.visitor.MemberVisitor;
/**
* This MemberVisitor marks all methods that it visits as not having any side
* effects. It will make the SideEffectMethodMarker consider them as such
* without further analysis.
*
* @see SideEffectMethodMarker
* @author Eric Lafortune
*/
public class NoSideEffectMethodMarker
extends SimplifiedVisitor
implements MemberVisitor
{
// A visitor info flag to indicate the visitor accepter is being kept,
// but that it doesn't have any side effects.
public static final Object KEPT_BUT_NO_SIDE_EFFECTS = new Object();
// Implementations for MemberVisitor.
public void visitAnyMember(Clazz Clazz, Member member)
{
// Ignore any attempts to mark fields.
}
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
markNoSideEffects(programMethod);
}
public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
{
markNoSideEffects(libraryMethod);
}
// Small utility methods.
private static void markNoSideEffects(Method method)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
if (info != null)
{
info.setNoSideEffects();
}
else
{
MethodLinker.lastMember(method).setVisitorInfo(KEPT_BUT_NO_SIDE_EFFECTS);
}
}
public static boolean hasNoSideEffects(Method method)
{
if (MethodLinker.lastVisitorAccepter(method).getVisitorInfo() == KEPT_BUT_NO_SIDE_EFFECTS)
{
return true;
}
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
return info != null &&
info.hasNoSideEffects();
}
}
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