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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.attribute.*;
import proguard.classfile.attribute.annotation.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.editor.ConstantPoolEditor;
import proguard.classfile.util.*;
import proguard.classfile.visitor.MemberVisitor;
/**
* This MemberVisitor adds an additional parameter to the duplicate
* initialization methods that it visits.
*/
public class DuplicateInitializerFixer
extends SimplifiedVisitor
implements MemberVisitor,
AttributeVisitor
{
private static final boolean DEBUG = false;
private static final char[] TYPES = new char[]
{
ClassConstants.TYPE_BYTE,
ClassConstants.TYPE_CHAR,
ClassConstants.TYPE_SHORT,
ClassConstants.TYPE_INT,
ClassConstants.TYPE_BOOLEAN
};
private final MemberVisitor extraFixedInitializerVisitor;
/**
* Creates a new DuplicateInitializerFixer.
*/
public DuplicateInitializerFixer()
{
this(null);
}
/**
* Creates a new DuplicateInitializerFixer with an extra visitor.
* @param extraFixedInitializerVisitor an optional extra visitor for all
* initializers that have been fixed.
*/
public DuplicateInitializerFixer(MemberVisitor extraFixedInitializerVisitor)
{
this.extraFixedInitializerVisitor = extraFixedInitializerVisitor;
}
// Implementations for MemberVisitor.
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
// Is it a class instance initializer?
String name = programMethod.getName(programClass);
if (name.equals(ClassConstants.METHOD_NAME_INIT))
{
// Is there already another initializer with the same descriptor?
String descriptor = programMethod.getDescriptor(programClass);
Method similarMethod = programClass.findMethod(name, descriptor);
if (!programMethod.equals(similarMethod))
{
// Should this initializer be preserved?
if (KeepMarker.isKept(programMethod))
{
// Fix the other initializer.
programMethod = (ProgramMethod)similarMethod;
}
int index = descriptor.indexOf(ClassConstants.METHOD_ARGUMENTS_CLOSE);
// Try to find a new, unique descriptor.
int typeCounter = 0;
while (true)
{
// Construct the new descriptor by inserting a new type
// as an additional last argument.
StringBuffer newDescriptorBuffer =
new StringBuffer(descriptor.substring(0, index));
for (int arrayDimension = 0; arrayDimension < typeCounter / TYPES.length; arrayDimension++)
{
newDescriptorBuffer.append(ClassConstants.TYPE_ARRAY);
}
newDescriptorBuffer.append(TYPES[typeCounter % TYPES.length]);
newDescriptorBuffer.append(descriptor.substring(index));
String newDescriptor = newDescriptorBuffer.toString();
// Is the new initializer descriptor unique?
if (programClass.findMethod(name, newDescriptor) == null)
{
if (DEBUG)
{
System.out.println("DuplicateInitializerFixer:");
System.out.println(" ["+programClass.getName()+"."+name+descriptor+"] ("+ClassUtil.externalClassAccessFlags(programMethod.getAccessFlags())+") -> ["+newDescriptor+"]");
}
// Update the descriptor.
programMethod.u2descriptorIndex =
new ConstantPoolEditor(programClass).addUtf8Constant(newDescriptor);
// Fix the local variable frame size, the method
// signature, and the parameter annotations, if
// necessary.
programMethod.attributesAccept(programClass,
this);
// Visit the initializer, if required.
if (extraFixedInitializerVisitor != null)
{
extraFixedInitializerVisitor.visitProgramMethod(programClass, programMethod);
}
// We're done with this constructor.
return;
}
typeCounter++;
}
}
}
}
// Implementations for AttributeVisitor.
public void visitAnyAttribute(Clazz clazz, Attribute attribute) {}
public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
{
// The minimum variable size is determined by the arguments.
int maxLocals =
ClassUtil.internalMethodParameterSize(method.getDescriptor(clazz),
method.getAccessFlags());
if (codeAttribute.u2maxLocals < maxLocals)
{
codeAttribute.u2maxLocals = maxLocals;
}
}
public void visitSignatureAttribute(Clazz clazz, Method method, SignatureAttribute signatureAttribute)
{
String descriptor = method.getDescriptor(clazz);
int descriptorIndex = descriptor.indexOf(ClassConstants.METHOD_ARGUMENTS_CLOSE);
String signature = signatureAttribute.getSignature(clazz);
int signatureIndex = signature.indexOf(ClassConstants.METHOD_ARGUMENTS_CLOSE);
String newSignature = signature.substring(0, signatureIndex) +
descriptor.charAt(descriptorIndex - 1) +
signature.substring(signatureIndex);
// Update the signature.
signatureAttribute.u2signatureIndex =
new ConstantPoolEditor((ProgramClass)clazz).addUtf8Constant(newSignature);
}
public void visitAnyParameterAnnotationsAttribute(Clazz clazz, Method method, ParameterAnnotationsAttribute parameterAnnotationsAttribute)
{
// Update the number of parameters.
int oldParametersCount = parameterAnnotationsAttribute.u1parametersCount++;
if (parameterAnnotationsAttribute.u2parameterAnnotationsCount == null ||
parameterAnnotationsAttribute.u2parameterAnnotationsCount.length < parameterAnnotationsAttribute.u1parametersCount)
{
int[] annotationsCounts = new int[parameterAnnotationsAttribute.u1parametersCount];
Annotation[][] annotations = new Annotation[parameterAnnotationsAttribute.u1parametersCount][];
System.arraycopy(parameterAnnotationsAttribute.u2parameterAnnotationsCount,
0,
annotationsCounts,
0,
oldParametersCount);
System.arraycopy(parameterAnnotationsAttribute.parameterAnnotations,
0,
annotations,
0,
oldParametersCount);
parameterAnnotationsAttribute.u2parameterAnnotationsCount = annotationsCounts;
parameterAnnotationsAttribute.parameterAnnotations = annotations;
}
}
}
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