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Implement tba_determinize_check(), following Dax et al. (ATVA'07).

Browse source 
* src/tgbaalgos/powerset.cc, src/tgbaalgos/powerset.hh
(tba_determinize_check): New function.
* src/tgbatest/ltl2tgba.cc (-O): Use it.
This commit is contained in:
Alexandre Duret-Lutz 2013-01-21 16:01:45 +01:00
parent bd2e78c1ed
commit 4ac6468bfc
3 changed files with 103 additions and 1 deletions
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74
src/tgbaalgos/powerset.cc
View file

@ -33,6 +33,11 @@
#include "tgba/tgbaproduct.hh"
#include "tgba/bddprint.hh"
#include "tgbaalgos/dotty.hh"
#include "tgbaalgos/gtec/gtec.hh"
#include "tgbaalgos/sccfilter.hh"
#include "tgbaalgos/ltl2tgba_fm.hh"
#include "tgbaalgos/dbacomp.hh"
#include "ltlast/unop.hh"
namespace spot
{
@ -309,4 +314,73 @@ namespace spot
det->merge_transitions();
return det;
}
tgba*
tba_determinize_check(const tgba* aut,
const ltl::formula* f,
const tgba* neg_aut)
{
const tgba* built = 0;
if (f == 0 && neg_aut == 0)
return 0;
if (aut->number_of_acceptance_conditions() > 1)
return 0;
tgba_explicit_number* det = tba_determinize(aut);
if (neg_aut == 0)
{
const ltl::formula* neg_f =
ltl::unop::instance(ltl::unop::Not, f->clone());
neg_aut = ltl_to_tgba_fm(neg_f, aut->get_dict());
neg_f->destroy();
// Remove useless SCCs.
const tgba* tmp = scc_filter(neg_aut, true);
delete neg_aut;
built = neg_aut = tmp;
}
bool ok = false;
tgba* p = new tgba_product(det, neg_aut);
emptiness_check* ec = couvreur99(p);
emptiness_check_result* res = ec->check();
if (!res)
{
delete ec;
delete p;
// Complement the DBA.
tgba* neg_det = dba_complement(det);
tgba* p = new tgba_product(aut, neg_det);
emptiness_check* ec = couvreur99(p);
res = ec->check();
if (!res)
{
// Finally, we are now sure that it was safe
// to determinize the automaton.
ok = true;
}
delete res;
delete ec;
delete p;
delete neg_det;
}
else
{
delete res;
delete ec;
delete p;
}
delete built;
if (ok)
return det;
delete det;
return const_cast<tgba*>(aut);
}
}