minato.hh

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00001 // Copyright (C) 2009 Laboratoire de Recherche et Développement
00002 // de l'Epita (LRDE).
00003 // Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
00004 // département Systèmes Répartis Coopératifs (SRC), Université Pierre
00005 // et Marie Curie.
00006 //
00007 // This file is part of Spot, a model checking library.
00008 //
00009 // Spot is free software; you can redistribute it and/or modify it
00010 // under the terms of the GNU General Public License as published by
00011 // the Free Software Foundation; either version 2 of the License, or
00012 // (at your option) any later version.
00013 //
00014 // Spot is distributed in the hope that it will be useful, but WITHOUT
00015 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
00016 // or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
00017 // License for more details.
00018 //
00019 // You should have received a copy of the GNU General Public License
00020 // along with Spot; see the file COPYING.  If not, write to the Free
00021 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
00022 // 02111-1307, USA.
00023 
00024 #ifndef SPOT_MISC_MINATO_HH
00025 # define SPOT_MISC_MINATO_HH
00026 
00027 # include <bdd.h>
00028 # include <stack>
00029 
00030 namespace spot
00031 {
00052   class minato_isop
00053   {
00054   public:
00057     minato_isop(bdd input);
00061     minato_isop(bdd input, bdd vars);
00064     bdd next();
00065 
00066   private:
00068     struct local_vars
00069     {
00070       // If you are following the paper, f_min and f_max correspond
00071       // to the pair of BDD functions used to encode the ternary function f
00072       // (see Section 3.4).
00073       // Also note that f0, f0', and f0'' all share the same _max function.
00074       // Likewise for f1, f1', and f1''.
00075       bdd f_min, f_max;
00076       // Because we need a non-recursive version of the algorithm,
00077       // we had to split it in four steps (each step is separated
00078       // from the other by a call to ISOP in the original algorithm).
00079       enum { FirstStep, SecondStep, ThirdStep, FourthStep } step;
00080       // The list of variables to factorize.  This is an addition to
00081       // the original algorithm.
00082       bdd vars;
00083       bdd v1;
00084       bdd f0_min, f0_max;
00085       bdd f1_min, f1_max;
00086       bdd g0, g1;
00087       local_vars(bdd f_min, bdd f_max, bdd vars)
00088         : f_min(f_min), f_max(f_max), step(FirstStep), vars(vars) {}
00089     };
00090     std::stack<local_vars> todo_;
00091     std::stack<bdd> cube_;
00092     bdd ret_;
00093   };
00094 }
00095 
00096 #endif // SPOT_MISC_MINATO_HH

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