proguard.optimize.info.UnusedParameterOptimizationInfoUpdater Maven / Gradle / Ivy
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2018 GuardSquare NV
*
* 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.attribute.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.util.*;
import proguard.classfile.visitor.*;
import proguard.optimize.*;
/**
* This AttributeVisitor removes unused parameters from the optimization info
* of the methods that it visits. This includes 'this' parameters.
*
* @see ParameterUsageMarker
* @see MethodStaticizer
* @see MethodDescriptorShrinker
* @author Eric Lafortune
*/
public class UnusedParameterOptimizationInfoUpdater
extends SimplifiedVisitor
implements AttributeVisitor,
// Internal implementations.
ParameterVisitor
{
//*
private static final boolean DEBUG = false;
/*/
private static boolean DEBUG = System.getProperty("upoiu") != null;
//*/
private final MemberVisitor extraUnusedParameterMethodVisitor;
private final MemberVisitor unusedParameterRemover = new AllParameterVisitor(true,
new UsedParameterFilter(null, this));
// Parameters and return values for visitor methods.
private int removedParameterSize;
private int removedParameterCount;
/**
* Creates a new UnusedParameterOptimizationInfoUpdater.
*/
public UnusedParameterOptimizationInfoUpdater()
{
this(null);
}
/**
* Creates a new UnusedParameterOptimizationInfoUpdater with an extra
* visitor.
* @param extraUnusedParameterMethodVisitor an optional extra visitor for
* all removed parameters.
*/
public UnusedParameterOptimizationInfoUpdater(MemberVisitor extraUnusedParameterMethodVisitor)
{
this.extraUnusedParameterMethodVisitor = extraUnusedParameterMethodVisitor;
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
{
if (DEBUG)
{
System.out.println("UnusedParameterOptimizationInfoUpdater: "+clazz.getName()+"."+method.getName(clazz)+method.getDescriptor(clazz));
}
// Update the optimization info.
removedParameterCount = 0;
removedParameterSize = 0;
method.accept(clazz, unusedParameterRemover);
// Compute the new parameter size from the shrunk descriptor.
ProgramMethodOptimizationInfo programMethodOptimizationInfo =
ProgramMethodOptimizationInfo.getProgramMethodOptimizationInfo(method);
int newParameterSize =
programMethodOptimizationInfo.getParameterSize() - removedParameterSize;
programMethodOptimizationInfo.setParameterSize(newParameterSize);
programMethodOptimizationInfo.updateUsedParameters(-1L);
}
// Implementations for ParameterVisitor.
public void visitParameter(Clazz clazz, Member member, int parameterIndex, int parameterCount, int parameterOffset, int parameterSize, String parameterType, Clazz referencedClass)
{
if (DEBUG)
{
System.out.println(" Deleting parameter #"+parameterIndex+" (v"+parameterOffset+")");
}
Method method = (Method)member;
// Remove the unused parameter in the optimization info.
// Take into acount the delta from previously removed parameters.
ProgramMethodOptimizationInfo programMethodOptimizationInfo =
ProgramMethodOptimizationInfo.getProgramMethodOptimizationInfo(method);
programMethodOptimizationInfo.removeParameter(parameterIndex - removedParameterCount++);
removedParameterSize += ClassUtil.internalTypeSize(parameterType);
// Visit the method, if required.
if (extraUnusedParameterMethodVisitor != null)
{
method.accept(clazz, extraUnusedParameterMethodVisitor);
}
}
}
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