/*
* AbstractValueFactory.java - This file is part of the Jakstab project.
* Copyright 2007-2015 Johannes Kinder <jk@jakstab.org>
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, see <http://www.gnu.org/licenses/>.
*/
package org.jakstab.analysis;
import java.util.Collection;
import org.jakstab.rtl.expressions.RTLNumber;
/**
* AbstractValueFactory provides a mechanism for generic abstraction of
* concrete values into an abstract domain. It is used by the ValuationState,
* VariableValuation, and PartitionedMemory classes.
*
* @author Johannes Kinder
* @param <A> The type of elements in the abstract domain
*/
public interface AbstractValueFactory<A extends AbstractValue> {
/**
* The abstraction function for a single concrete number.
*
* @param n The concrete number to abstract, must be non-null.
* @return the abstract value corresponding to the provided number.
*/
public A createAbstractValue(RTLNumber n);
/**
* The abstraction function for sets of concrete numbers.
*
* @param n The set of concrete numbers to abstract, must be non-null.
* @return the single abstract value that abstracts all concrete
* numbers in the set.
*/
public A createAbstractValue(Collection<RTLNumber> numbers);
/**
* Creates the TOP element for this domain with a certain bit width.
* The object returned is not guaranteed to be unique. Bitvector type
* domains have several "TOP elements", one for each bit width. Joining
* TOP elements of several bit widths may cause an exception.
*
* @param bitWidth the bit width of the top element.
* @return a TOP element of this domain with the specified bit width
*/
public A createTop(int bitWidth);
/**
* Shorthand function for creating abstract elements of this domain
* abstracting the Boolean TRUE value.
*
* @return An abstract value for TRUE.
*/
public A createTrue();
/**
* Shorthand function for creating abstract elements of this domain
* abstracting the Boolean FALSE value.
*
* @return An abstract value for FALSE.
*/
public A createFalse();
}