/*
 * Bytecode Analysis Framework
 * Copyright (C) 2003,2004 University of Maryland
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.ba;

/**
 * Algorithm to perform a reverse depth first search on a CFG. (I.e., depth
 * first search on reversed CFG.)
 *
 * @see CFG
 * @author David Hovemeyer
 */
public class ReverseDepthFirstSearch extends edu.umd.cs.findbugs.graph.ReverseDepthFirstSearch<CFG, Edge, BasicBlock> {
    private BasicBlock firstRoot;

    /**
     * Constructor.
     *
     * @param cfg
     *            the CFG to perform the reverse depth first search on
     */
    public ReverseDepthFirstSearch(CFG cfg) {
        super(cfg);
        this.firstRoot = cfg.getExit();
    }

    @Override
    protected BasicBlock getNextSearchTreeRoot() {
        BasicBlock result = firstRoot;
        firstRoot = null;
        return result;
    }
}

