postproc.cc 3.46 KB
Newer Older
1 2 3 4 5 6 7 8
// -*- coding: utf-8 -*-
// Copyright (C) 2012 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
9
// the Free Software Foundation; either version 3 of the License, or
10 11 12 13 14 15 16 17
// (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
18
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
19 20 21 22 23 24 25

#include "postproc.hh"
#include "minimize.hh"
#include "simulation.hh"
#include "sccfilter.hh"
#include "degen.hh"
#include "stats.hh"
26
#include "stripacc.hh"
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

namespace spot
{
  unsigned count_states(const tgba* a)
  {
    // FIXME: the number of states can be found more
    // efficiently in explicit automata.
    tgba_statistics st = stats_reachable(a);
    return st.states;
  }

  const tgba* postprocessor::run(const tgba* a, const ltl::formula* f)
  {
    if (type_ == TGBA && pref_ == Any && level_ == Low)
      return a;

    // Remove useless SCCs.
    {
      const tgba* s = scc_filter(a, false);
      delete a;
      a = s;
    }

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92
    if (type_ == Monitor)
      {
	if (pref_ == Deterministic)
	  {
	    const tgba* m = minimize_monitor(a);
	    delete a;
	    return m;
	  }
	else
	  {
	    const tgba* m = strip_acceptance(a);
	    delete a;
	    a = m;
	  }
	if (pref_ == Any)
	  return a;

	const tgba* sim;
	if (level_ == Low)
	  sim = simulation(a);
	else
	  sim = iterated_simulations(a);
	if (level_ != High)
	  {
	    delete a;
	    return sim;
	  }
	// For Small,High we return the smallest between the output of
	// the simulation, and that of the deterministic minimization.
	const tgba* m = minimize_monitor(a);
	delete a;
	if (count_states(m) > count_states(sim))
	  {
	    delete m;
	    return sim;
	  }
	else
	  {
	    delete sim;
	    return m;
	  }
      }

93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151
    if (pref_ == Any)
      {
	if (type_ == BA)
	  {
	    const tgba* d = degeneralize(a);
	    delete a;
	    a = d;
	  }
	return a;
      }

    const tgba* wdba = 0;
    const tgba* sim = 0;

    // (Small,Low) is the only configuration where we do not run
    // WDBA-minimization.
    if (pref_ != Small || level_ != Low)
      {
	bool reject_bigger = (pref_ == Small) && (level_ == Medium);
	wdba = minimize_obligation(a, f, 0, reject_bigger);
	if (wdba == a)	// Minimization failed.
	  wdba = 0;
	// The WDBA is a BA, so no degeneralization required.
      }

    // Run a simulation when wdba failed (or was not run), or
    // at hard levels if we want a small output.
    if (!wdba || (level_ == High && pref_ == Small))
      {
	if (level_ == Low)
	  sim = simulation(a);
	else
	  sim = iterated_simulations(a);

	// Degeneralize the result of the simulation if needed.
	if (type_ == BA)
	  {
	    const tgba* d = degeneralize(sim);
	    delete sim;
	    sim = d;
	  }
      }

    delete a;

    if (wdba && sim)
      {
	if (count_states(wdba) > count_states(sim))
	  {
	    delete wdba;
	    wdba = 0;
	  }
	else
	  {
	    delete sim;
	    sim = 0;
	  }
      }

152 153 154 155 156 157 158
    if (sim && type_ == TGBA && level_ == High)
      {
	const tgba* s = scc_filter(sim, true);
	delete sim;
	return s;
      }

159 160 161
    return wdba ? wdba : sim;
  }
}