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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.evaluation;
import proguard.classfile.*;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.*;
import proguard.evaluation.value.*;
import proguard.optimize.info.*;
/**
* This ClassVisitor propagates the value of the $VALUES field to the values()
* method in the simple enum classes that it visits.
*
* @see SimpleEnumMarker
* @author Eric Lafortune
*/
public class SimpleEnumArrayPropagator
extends SimplifiedVisitor
implements ClassVisitor,
MemberVisitor
{
private final ValueFactory valueFactory = new ParticularValueFactory();
private Value array;
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
// Update the return value of the "int[] values()" method.
programClass.methodsAccept(new MemberDescriptorFilter("()[I", this));
}
// Implementations for MemberVisitor.
public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
{
// Find the array length of the "int[] $VALUES" field.
programClass.fieldsAccept(new MemberDescriptorFilter("[I", this));
if (array != null)
{
// Set the array value with the found array length. We can't use
// the original array, because its elements might get overwritten.
Value propagatedArray =
valueFactory.createArrayReferenceValue("I",
null,
array.referenceValue().arrayLength(
valueFactory));
setMethodReturnValue(programMethod, propagatedArray);
array = null;
}
}
public void visitProgramField(ProgramClass programClass, ProgramField programField)
{
array = StoringInvocationUnit.getFieldValue(programField);
}
// Small utility methods.
private static void setMethodReturnValue(Method method, Value value)
{
MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
if (info != null)
{
info.setReturnValue(value);
}
}
}
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