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powerset: some clean up

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* spot/twaalgos/powerset.cc: Remove some unnecessary code, as spotted
by Fanda.  Also fix some comments.
This commit is contained in:
Alexandre Duret-Lutz 2019-01-23 11:15:25 +01:00
parent ff960ee313
commit 573c593fa2
1 changed files with 20 additions and 27 deletions
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47
spot/twaalgos/powerset.cc
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@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2009-2011, 2013-2018 Laboratoire de Recherche et
// Copyright (C) 2009-2011, 2013-2019 Laboratoire de Recherche et
// Développement de l'Epita (LRDE).
// Copyright (C) 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
// département Systèmes Répartis Coopératifs (SRC), Université Pierre
@ -73,14 +73,6 @@ namespace spot
twa_graph_ptr
tgba_powerset(const const_twa_graph_ptr& aut, power_map& pm, bool merge)
{
{
typedef std::set<bdd, bdd_less_than> sup_map;
sup_map sup;
// Record occurrences of all guards
for (auto& t: aut->edges())
sup.emplace(t.cond);
}
unsigned ns = aut->num_states();
unsigned nap = aut->ap().size();
@ -105,7 +97,8 @@ namespace spot
size_t nc = num2bdd.size(); // number of conditions
assert(nc == (1UL << nap));
// An array of bit vectors of size 'ns'. Each original state is
// Conceptually, we represent the automaton as an array 'bv' of
// ns*nc bit vectors of size 'ns'. Each original state is
// represented by 'nc' consecutive bitvectors representing the
// possible destinations for each condition.
//
@ -124,7 +117,7 @@ namespace spot
// a&b [...bit vector of size ns...]
// ...
//
// since there are nc possible "cond" value, ans ns sources, the
// Since there are nc possible "cond" value, and ns sources, the
// ns*nc bitvectors of ns bits each can take a lot of space. In
// issue #302, we had the case of an automaton with ns=8777
// states, and 8 atomic propositions (nc=256): this large array
@ -134,7 +127,7 @@ namespace spot
// To work around this, we reduce the number of states we store in
// this array to reduced_ns, which we currently limit to 512
// (chosen arbitrarily), and use it as a least-recently-used
// cache. A separate vector of size ns, contains pointer
// cache. A separate vector of size ns, contains pointers
// (i.e. iterators) to a list cell that gives an index in this
// cache. The purpose of the list is to maintain the
// least-recently-used order.
@ -283,11 +276,11 @@ namespace spot
protected:
const_twa_graph_ptr ref_;
power_map& refmap_;
edge_set reject_; // set of rejecting edges
set_set accept_; // set of cycles that are accepting
edge_set all_; // all non rejecting edges
unsigned threshold_; // maximum count of enumerated cycles
unsigned cycles_left_; // count of cycles left to explore
edge_set reject_; // set of rejecting edges
set_set accept_; // set of cycles that are accepting
edge_set all_; // all non rejecting edges
unsigned threshold_; // maximum count of enumerated cycles
unsigned cycles_left_; // count of cycles left to explore
public:
fix_scc_acceptance(const scc_info& sm, const_twa_graph_ptr ref,
@ -362,15 +355,15 @@ namespace spot
return accepting;
}
std::ostream&
print_set(std::ostream& o, const edge_set& s) const
{
o << "{ ";
for (auto i: s)
o << i << ' ';
o << '}';
return o;
}
// std::ostream&
// print_set(std::ostream& o, const edge_set& s) const
// {
// o << "{ ";
// for (auto i: s)
// o << i << ' ';
// o << '}';
// return o;
// }
virtual bool
cycle_found(unsigned start) override
@ -399,7 +392,7 @@ namespace spot
}
}
// Abort this algorithm if we have seen too much cycles, i.e.,
// Abort this algorithm if we have seen too many cycles, i.e.,
// when cycle_left_ *reaches* 0. (If cycle_left_ == 0, that
// means we had no limit.)
return (cycles_left_ == 0) || --cycles_left_;