/*******************************************************************************
* Copyright (c) 2002 - 2006 IBM Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package com.ibm.wala.dataflow.IFDS;
import com.ibm.wala.util.intset.IntSet;
/**
* A flow function corresponding to an edge in the supergraph. A reversible flow-function supports a getSources operation that
* allows computing backwards flow. At the very least, this is required in IFDS by call functions for which sources need to be found
* to handle insertion of summary edges.
*/
public interface IReversibleFlowFunction extends IUnaryFlowFunction {
/**
* @param d2
* @return set of d1 such that (d1,d2) is an edge in this distributive function's graph representation, or null if there are none
*/
public IntSet getSources(int d2);
}