3c17c418a2
* src/tgbaalgos/isweakscc.cc, src/tgbaalgos/isweakscc.hh: Speedup when all transitions are accepting.
88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
// Copyright (C) 2012 Laboratoire de Recherche et Developpement de
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// l'Epita (LRDE).
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Spot; see the file COPYING. If not, write to the Free
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// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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// 02111-1307, USA.
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#ifndef SPOT_TGBAALGOS_ISWEAKSCC_CC
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# define SPOT_TGBAALGOS_ISWEAKSCC_CC
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#include "cycles.hh"
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namespace spot
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{
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namespace
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{
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// Look for a non-accepting cycle.
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class weak_checker: public enumerate_cycles
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{
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public:
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bool result;
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weak_checker(const scc_map& map)
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: enumerate_cycles(map), result(true)
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{
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}
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virtual bool
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cycle_found(const state* start)
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{
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dfs_stack::const_reverse_iterator i = dfs_.rbegin();
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bdd acc = bddfalse;
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for (;;)
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{
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acc |= i->succ->current_acceptance_conditions();
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if (i->ts->first == start)
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break;
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++i;
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assert(i != dfs_.rend());
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}
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if (acc != aut_->all_acceptance_conditions())
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{
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// We have found an non-accepting cycle, so the SCC is not
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// weak.
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result = false;
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return false;
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}
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return true;
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}
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};
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}
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bool
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is_weak_scc(scc_map& map, unsigned scc)
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{
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// If no cycle is accepting, the SCC is weak.
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if (!map.accepting(scc))
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return true;
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// If all transitions use all acceptance conditions, the SCC is weak.
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if (map.useful_acc_of(scc) ==
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bdd_support(map.get_aut()->neg_acceptance_conditions()))
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return true;
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// If the SCC is accepting, but one cycle is not, the SCC is not
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// weak.
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weak_checker w(map);
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w.run(scc);
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return w.result;
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}
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}
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#endif // SPOT_TGBAALGOS_ISWEAKSCC_CC
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