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misc/minato.hh

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00001 // Copyright (C) 2003 Laboratoire d'Informatique de Paris 6 (LIP6), 00002 // département Systèmes Répartis Coopératifs (SRC), Université Pierre 00003 // et Marie Curie. 00004 // 00005 // This file is part of Spot, a model checking library. 00006 // 00007 // Spot is free software; you can redistribute it and/or modify it 00008 // under the terms of the GNU General Public License as published by 00009 // the Free Software Foundation; either version 2 of the License, or 00010 // (at your option) any later version. 00011 // 00012 // Spot is distributed in the hope that it will be useful, but WITHOUT 00013 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 00014 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 00015 // License for more details. 00016 // 00017 // You should have received a copy of the GNU General Public License 00018 // along with Spot; see the file COPYING. If not, write to the Free 00019 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 00020 // 02111-1307, USA. 00021 00022 #ifndef SPOT_MISC_MINATO_HH 00023 # define SPOT_MISC_MINATO_HH 00024 00025 # include <bdd.h> 00026 # include <stack> 00027 00028 namespace spot 00029 { 00049 class minato_isop 00050 { 00051 public: 00054 minato_isop(bdd input); 00058 minato_isop(bdd input, bdd vars); 00061 bdd next(); 00062 00063 private: 00065 struct local_vars 00066 { 00067 // If you are following the paper, f_min and f_max corresponds 00068 // to the pair of BDD function used to encode the ternary function `f' 00069 // (see Section 3.4). 00070 // Also note that f0, f0', and f0'' all share the same _max function. 00071 // Likewise for f1, f1', and f1''. 00072 bdd f_min, f_max; 00073 // Because we need a non-recursive version of the algorithm, 00074 // we had to split it in four step (each step is separated 00075 // from the other by a call to ISOP in the original algorithm). 00076 enum { FirstStep, SecondStep, ThirdStep, FourthStep } step; 00077 // The list of variable to factorize. This is an addition to 00078 // the original algorithm. 00079 bdd vars; 00080 bdd v1; 00081 bdd f0_min, f0_max; 00082 bdd f1_min, f1_max; 00083 bdd g0, g1; 00084 local_vars(bdd f_min, bdd f_max, bdd vars) 00085 : f_min(f_min), f_max(f_max), step(FirstStep), vars(vars) {} 00086 }; 00087 std::stack<local_vars> todo_; 00088 std::stack<bdd> cube_; 00089 bdd ret_; 00090 }; 00091 } 00092 00093 #endif // SPOT_MISC_MINATO_HH

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