48ecb903c5
* tests/core/sepsets.test: New test case. * spot/twaalgos/sepsets.cc: Fix the code. * NEWS: Mention the problem.
101 lines
2.8 KiB
C++
101 lines
2.8 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2015-2019 Laboratoire de Recherche et
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// Développement de l'Epita.
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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 3 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 this program. If not, see <http://www.gnu.org/licenses/>.
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#include "config.h"
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#include <spot/twaalgos/sepsets.hh>
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#include <spot/twaalgos/sccinfo.hh>
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namespace spot
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{
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namespace
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{
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static acc_cond::mark_t common_sets(const const_twa_graph_ptr& aut)
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{
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auto p = aut->get_acceptance().used_inf_fin_sets();
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return p.first & p.second;
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}
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}
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bool has_separate_sets(const const_twa_graph_ptr& aut)
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{
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return !common_sets(aut);
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}
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twa_graph_ptr
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separate_sets_here(const twa_graph_ptr& aut)
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{
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auto common = common_sets(aut);
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if (!common)
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return aut;
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// Each Fin(first) should be replaced by Fin(second).
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std::vector<std::pair<acc_cond::mark_t, acc_cond::mark_t>> map;
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{
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unsigned base = aut->acc().add_sets(common.count());
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for (auto s: common.sets())
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map.emplace_back(acc_cond::mark_t({s}),
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acc_cond::mark_t({base++}));
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}
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// Fix the acceptance condition
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auto& code = aut->acc().get_acceptance();
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// If code were empty, then common would have been 0.
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assert(!code.empty());
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acc_cond::acc_word* pos = &code.back();
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acc_cond::acc_word* start = &code.front();
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while (pos > start)
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{
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switch (pos->sub.op)
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{
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case acc_cond::acc_op::Or:
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case acc_cond::acc_op::And:
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--pos;
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break;
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case acc_cond::acc_op::Fin:
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case acc_cond::acc_op::FinNeg:
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if (pos[-1].mark & common)
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for (auto p: map)
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if (pos[-1].mark & p.first)
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{
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pos[-1].mark -= p.first;
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pos[-1].mark |= p.second;
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}
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SPOT_FALLTHROUGH;
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case acc_cond::acc_op::Inf:
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case acc_cond::acc_op::InfNeg:
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pos -= 2;
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break;
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}
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}
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// Fix the edges
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for (auto& t: aut->edges())
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{
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if (!(t.acc & common))
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continue;
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for (auto p: map)
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if (t.acc & p.first)
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t.acc |= p.second;
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}
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return aut;
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}
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}
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