ebe4ffc507
Because scc_info does not perform a full emptiness check, it is not always able to tell whether an SCC is accepting if the acceptance condition use Fin primitives. This introduce is_rejecting_scc() in addition to to is_accepting_scc(). Only one of them may be true, but they can both be false if scc_info has no idea whether the SCC is accepting. * src/tgbaalgos/sccinfo.cc, src/tgbaalgos/sccinfo.hh: Implement is_rejecting_scc(). * src/bin/ltlcross.cc, src/tgba/acc.cc, src/tgba/acc.hh, src/tgbaalgos/dtgbacomp.cc, src/tgbaalgos/isweakscc.cc, src/tgbaalgos/remfin.cc, src/tgbaalgos/safety.cc, src/tgbaalgos/sccfilter.cc: Use it. * src/tgbaalgos/dotty.cc: Use is_rejecting_scc() and is_accepting_scc() to color SCCs. * doc/org/oaut.org: Document the colors used. * src/tgbatest/neverclaimread.test, src/tgbatest/readsave.test: Adjust tests. * src/tgbatest/sccdot.test: New test case. * src/tgbatest/Makefile.am: Add it.
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
// -*- coding: utf-8 -*-
|
|
// Copyright (C) 2010, 2011, 2013, 2014, 2015 Laboratoire de Recherche
|
|
// et Développement de l'Epita (LRDE)
|
|
//
|
|
// This file is part of Spot, a model checking library.
|
|
//
|
|
// Spot is free software; you can redistribute it and/or modify it
|
|
// under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// Spot 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 General Public
|
|
// License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#include "safety.hh"
|
|
#include "misc/hash.hh"
|
|
#include <deque>
|
|
|
|
namespace spot
|
|
{
|
|
bool
|
|
is_guarantee_automaton(const const_tgba_digraph_ptr& aut,
|
|
const scc_info* si)
|
|
{
|
|
if (aut->acc().uses_fin_acceptance())
|
|
throw std::runtime_error
|
|
("is_guarantee_automaton() does not support Fin acceptance");
|
|
|
|
// Create an scc_info if the user did not give one to us.
|
|
bool need_si = !si;
|
|
if (need_si)
|
|
si = new scc_info(aut);
|
|
|
|
bool result = true;
|
|
|
|
for (auto& scc: *si)
|
|
{
|
|
if (scc.is_rejecting())
|
|
continue;
|
|
// Non-rejecting SCCs should necessarily be accepting, because
|
|
// with only one self loop, there should be no ambiguity.
|
|
if (!scc.is_accepting())
|
|
return false;
|
|
// Accepting SCCs should have only one state.
|
|
auto& st = scc.states();
|
|
if (st.size() != 1)
|
|
{
|
|
result = false;
|
|
break;
|
|
}
|
|
// The state should have only one transition that is a
|
|
// self-loop labelled by true.
|
|
auto src = st.front();
|
|
auto out = aut->out(src);
|
|
auto it = out.begin();
|
|
assert(it != out.end());
|
|
result =
|
|
(it->cond == bddtrue) && (it->dst == src) && (++it == out.end());
|
|
if (!result)
|
|
break;
|
|
}
|
|
|
|
if (need_si)
|
|
delete si;
|
|
return result;
|
|
}
|
|
|
|
bool is_safety_mwdba(const const_tgba_digraph_ptr& aut)
|
|
{
|
|
if (!(aut->acc().is_buchi() || aut->acc().is_true()))
|
|
throw std::runtime_error
|
|
("is_safety_mwdba() should be called on a Buchi automaton");
|
|
|
|
for (auto& t: aut->transitions())
|
|
if (!aut->acc().accepting(t.acc))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
|
|
|
|
}
|