/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2010 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.constant.RefConstant;
import proguard.evaluation.BasicInvocationUnit;
import proguard.evaluation.value.*;
/**
* This InvocationUbit loads parameter values and return values that were
* previously stored with the methods that are invoked.
*
* @see StoringInvocationUnit
* @author Eric Lafortune
*/
public class LoadingInvocationUnit
extends BasicInvocationUnit
{
private final boolean loadFieldValues;
private final boolean loadMethodParameterValues;
private final boolean loadMethodReturnValues;
/**
* Creates a new LoadingInvocationUnit with the given value factory.
*/
public LoadingInvocationUnit(ValueFactory valueFactory)
{
this(valueFactory, false, false, false);
}
/**
* Creates a new LoadingInvocationUnit with the given value factory, for
* loading the specified values.
*/
public LoadingInvocationUnit(ValueFactory valueFactory,
boolean loadFieldValues,
boolean loadMethodParameterValues,
boolean loadMethodReturnValues)
{
super(valueFactory);
this.loadFieldValues = loadFieldValues;
this.loadMethodParameterValues = loadMethodParameterValues;
this.loadMethodReturnValues = loadMethodReturnValues;
}
// Implementations for BasicInvocationUnit.
protected Value getFieldClassValue(Clazz clazz,
RefConstant refConstant,
String type)
{
if (loadFieldValues)
{
// Do we know this field?
Member referencedMember = refConstant.referencedMember;
if (referencedMember != null)
{
// Retrieve the stored field class value.
ReferenceValue value = StoringInvocationUnit.getFieldClassValue((Field)referencedMember);
if (value != null &&
value.isParticular())
{
return value;
}
}
}
return super.getFieldClassValue(clazz, refConstant, type);
}
protected Value getFieldValue(Clazz clazz,
RefConstant refConstant,
String type)
{
if (loadFieldValues)
{
// Do we know this field?
Member referencedMember = refConstant.referencedMember;
if (referencedMember != null)
{
// Retrieve the stored field value.
Value value = StoringInvocationUnit.getFieldValue((Field)referencedMember);
if (value != null &&
value.isParticular())
{
return value;
}
}
}
return super.getFieldValue(clazz, refConstant, type);
}
protected Value getMethodParameterValue(Clazz clazz,
Method method,
int parameterIndex,
String type,
Clazz referencedClass)
{
if (loadMethodParameterValues)
{
// Retrieve the stored method parameter value.
Value value = StoringInvocationUnit.getMethodParameterValue(method, parameterIndex);
if (value != null &&
value.isParticular())
{
return value;
}
}
return super.getMethodParameterValue(clazz,
method,
parameterIndex,
type,
referencedClass);
}
protected Value getMethodReturnValue(Clazz clazz,
RefConstant refConstant,
String type)
{
if (loadMethodReturnValues)
{
// Do we know this method?
Member referencedMember = refConstant.referencedMember;
if (referencedMember != null)
{
// Retrieve the stored method return value.
Value value = StoringInvocationUnit.getMethodReturnValue((Method)referencedMember);
if (value != null &&
value.isParticular())
{
return value;
}
}
}
return super.getMethodReturnValue(clazz,
refConstant,
type);
}
// // Small utility methods.
//
// private Value refresh(Value value)
// {
// if (value.isParticular())
// {
// return value;
// }
//
// switch (value.computationalType())
// {
// case Value.TYPE_INTEGER: return valueFactory.createIntegerValue();
// case Value.TYPE_LONG: return valueFactory.createLongValue();
// case Value.TYPE_FLOAT: return valueFactory.createFloatValue();
// case Value.TYPE_DOUBLE: return valueFactory.createDoubleValue();
// default:
// {
// ReferenceValue referenceValue = value.referenceValue();
//
// return valueFactory.createReferenceValue(referenceValue.getType(),
// referenceValue.getReferencedClass(),
// referenceValue.isNull() != Value.NEVER);
// }
// }
// }
}