alarsyo/spot
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

* src/tgbaalgos/emptinesscheck.cc, src/tgbaalgos/emptinesscheck.hh:

Browse source 
Reindent.
(emptiness_check::~emptiness_check, emptiness_check::emptiness_check):
Remove, unused.
This commit is contained in:
Alexandre Duret-Lutz 2003-10-22 14:33:12 +00:00
parent 22a53800d9
commit 558642fe9c
3 changed files with 382 additions and 368 deletions
Download patch file Download diff file Expand all files Collapse all files

7
ChangeLog
View file

@ -1,3 +1,10 @@
2003-10-22 Alexandre Duret-Lutz <adl@src.lip6.fr>
* src/tgbaalgos/emptinesscheck.cc, src/tgbaalgos/emptinesscheck.hh:
Reindent.
(emptiness_check::~emptiness_check, emptiness_check::emptiness_check):
Remove, unused.
2003-10-15 Alexandre Duret-Lutz <adl@src.lip6.fr> 2003-10-15 Alexandre Duret-Lutz <adl@src.lip6.fr>
* iface/gspn/ltlgspn.cc (main): Allow invocations with * iface/gspn/ltlgspn.cc (main): Allow invocations with

218
src/tgbaalgos/emptinesscheck.cc
View file

@ -44,12 +44,6 @@ namespace spot
{ {
} }
std::string
connected_component::to_string_component()
{
return "+ index + condition + nbTransition + transitionCondition + notNull +";
}
bool bool
connected_component::isAccepted(tgba* aut) connected_component::isAccepted(tgba* aut)
{ {
@ -58,13 +52,12 @@ namespace spot
/// \brief Remove all the nodes accessible from the given node start_delete. /// \brief Remove all the nodes accessible from the given node start_delete.
/// ///
/// The removed graphe is the subgraphe containing nodes store /// The removed graph is the subgraph containing nodes stored
/// in table state_map with order -1. /// in table state_map with order -1.
void void
emptiness_check::remove_component(const tgba& aut, seen& state_map, const spot::state* start_delete) emptiness_check::remove_component(const tgba& aut, seen& state_map,
const spot::state* start_delete)
{ {
std::stack<spot::tgba_succ_iterator*> to_remove; std::stack<spot::tgba_succ_iterator*> to_remove;
state_map[start_delete] = -1; state_map[start_delete] = -1;
tgba_succ_iterator* iter_delete = aut.succ_iter(start_delete); tgba_succ_iterator* iter_delete = aut.succ_iter(start_delete);
@ -90,14 +83,6 @@ namespace spot
} }
} }
emptiness_check::~emptiness_check()
{
}
emptiness_check::emptiness_check()
{
}
/// \brief On-the-fly emptiness check. /// \brief On-the-fly emptiness check.
/// ///
/// The algorithm used here is adapted from Jean-Michel Couvreur's /// The algorithm used here is adapted from Jean-Michel Couvreur's
@ -128,7 +113,9 @@ emptiness_check::emptiness_check()
if (comp_tmp.index == seen_state_num[step.first]) if (comp_tmp.index == seen_state_num[step.first])
{ {
/// The current node is a root of a Strong Connected Component. /// The current node is a root of a Strong Connected Component.
spot::emptiness_check::remove_component(*aut_check, seen_state_num, step.first); spot::emptiness_check::remove_component(*aut_check,
seen_state_num,
step.first);
assert(!arc_accepting.empty()); assert(!arc_accepting.empty());
arc_accepting.pop(); arc_accepting.pop();
assert(root_component.size() == arc_accepting.size()); assert(root_component.size() == arc_accepting.size());
@ -148,7 +135,7 @@ emptiness_check::emptiness_check()
iter_->next(); iter_->next();
if (i == seen_state_num.end()) if (i == seen_state_num.end())
{ {
/// New node. // New node.
nbstate = nbstate + 1; nbstate = nbstate + 1;
assert(nbstate != 0); assert(nbstate != 0);
seen_state_num[current_state] = nbstate; seen_state_num[current_state] = nbstate;
@ -160,33 +147,39 @@ emptiness_check::emptiness_check()
} }
else if (seen_state_num[current_state] != -1) else if (seen_state_num[current_state] != -1)
{ {
/// A node with order != -1 (a seen node not removed). // A node with order != -1 (a seen node not removed).
assert(!root_component.empty()); assert(!root_component.empty());
connected_component comp = root_component.top(); connected_component comp = root_component.top();
root_component.pop(); root_component.pop();
bdd new_condition = bddfalse; bdd new_condition = bddfalse;
new_condition = bdd_apply(new_condition, current_accepting, bddop_or); new_condition = bdd_apply(new_condition, current_accepting,
new_condition = bdd_apply(new_condition, comp.condition, bddop_or); bddop_or);
new_condition = bdd_apply(new_condition, comp.condition,
bddop_or);
int current_index = seen_state_num[current_state]; int current_index = seen_state_num[current_state];
while (comp.index > current_index) while (comp.index > current_index)
{ {
/// root_component and arc_accepting are popped // root_component and arc_accepting are popped
/// until the head of root_component is less or // until the head of root_component is less or
/// equal to the order of the current state. // equal to the order of the current state.
assert(!root_component.empty()); assert(!root_component.empty());
comp = root_component.top(); comp = root_component.top();
root_component.pop(); root_component.pop();
new_condition = bdd_apply(new_condition,comp.condition, bddop_or); new_condition = bdd_apply(new_condition,comp.condition,
bddop_or);
assert(!arc_accepting.empty()); assert(!arc_accepting.empty());
bdd arc_acc = arc_accepting.top(); bdd arc_acc = arc_accepting.top();
arc_accepting.pop(); arc_accepting.pop();
new_condition = bdd_apply(new_condition, arc_acc, bddop_or); new_condition = bdd_apply(new_condition, arc_acc,
bddop_or);
} }
comp.condition = bdd_apply(comp.condition, new_condition, bddop_or); comp.condition = bdd_apply(comp.condition, new_condition,
bddop_or);
if (aut_check->all_accepting_conditions() == comp.condition) if (aut_check->all_accepting_conditions() == comp.condition)
{ {
/// A failure SCC is find, the automata is not empty. // A failure SCC is find, the automata is not empty.
//spot::bdd_print_dot(std::cout, aut_check->get_dict(),comp.condition); // spot::bdd_print_dot(std::cout, aut_check->get_dict(),
// comp.condition);
root_component.push(comp); root_component.push(comp);
std::cout << "CONSISTENT AUTOMATA" << std::endl; std::cout << "CONSISTENT AUTOMATA" << std::endl;
return false; return false;
@ -196,44 +189,50 @@ emptiness_check::emptiness_check()
} }
} }
} }
/// The automata is empty. // The automata is empty.
std::cout << "EMPTY LANGUAGE" << std::endl; std::cout << "EMPTY LANGUAGE" << std::endl;
return true; return true;
} }
std::ostream& std::ostream&
emptiness_check::print_result(std::ostream& os, const spot::tgba* aut, const tgba* restrict ) const emptiness_check::print_result(std::ostream& os, const spot::tgba* aut,
const tgba* restrict) const
{ {
os << "======================" << std::endl; os << "======================" << std::endl;
os << "Prefix:" << std::endl; os << "Prefix:" << std::endl;
os << "======================" << std::endl; os << "======================" << std::endl;
const bdd_dict* d = aut->get_dict(); const bdd_dict* d = aut->get_dict();
for (state_sequence::const_iterator i_se = seq_counter.begin(); i_se != seq_counter.end(); i_se++) for (state_sequence::const_iterator i_se = seq_counter.begin();
i_se != seq_counter.end(); i_se++)
{ {
if (restrict) if (restrict)
{ {
os << "*****Projected STATE :" << restrict->format_state(aut->project_state((*i_se), restrict)) << "*****" << std::endl; os << restrict->format_state(aut->project_state((*i_se), restrict))
<< std::endl;
} }
else else
{ {
os << "*****print STATE :" << aut->format_state((*i_se)) << "*****" << std::endl; os << aut->format_state((*i_se)) << std::endl;
} }
} }
os << "======================" << std::endl; os << "======================" << std::endl;
os << "Cycle:" <<std::endl; os << "Cycle:" <<std::endl;
os << "======================" << std::endl; os << "======================" << std::endl;
for (cycle_path::const_iterator it = periode.begin(); it != periode.end(); it++) for (cycle_path::const_iterator it = periode.begin();
it != periode.end(); it++)
{ {
if (restrict) if (restrict)
{ {
os << " | " << bdd_format_set(d, (*it).second) <<std::endl ; os << " | " << bdd_format_set(d, (*it).second) <<std::endl ;
os << "*****Projected STATE :" << restrict->format_state(aut->project_state((*it).first, restrict)) << "*****" << std::endl; os << restrict->format_state(aut->project_state((*it).first,
restrict))
<< std::endl;
} }
else else
{ {
os << " | " << bdd_format_set(d, (*it).second) <<std::endl ; os << " | " << bdd_format_set(d, (*it).second) <<std::endl ;
os << "*****print STATE :" << aut->format_state((*it).first) << "*****" << std::endl; os << aut->format_state((*it).first) << std::endl;
} }
} }
return os; return os;
@ -244,7 +243,8 @@ std::ostream&
emptiness_check::counter_example(const spot::tgba* aut_counter) emptiness_check::counter_example(const spot::tgba* aut_counter)
{ {
std::deque <pair_state_iter> todo_trace; std::deque <pair_state_iter> todo_trace;
typedef std::map <const spot::state*, const spot::state*, spot::state_ptr_less_than> path_state; typedef std::map<const spot::state*, const spot::state*,
spot::state_ptr_less_than> path_state;
path_state path_map; path_state path_map;
if (!root_component.empty()){ if (!root_component.empty()){
@ -267,59 +267,64 @@ std::ostream&
int q_index; int q_index;
int tmp_int = 0; int tmp_int = 0;
/// Fill the SCC in the stack root_component. // Fill the SCC in the stack root_component.
for (seen::iterator iter_map = seen_state_num.begin(); iter_map != seen_state_num.end(); iter_map++) for (seen::iterator iter_map = seen_state_num.begin();
iter_map != seen_state_num.end(); iter_map++)
{ {
q_index = (*iter_map).second; q_index = (*iter_map).second;
tmp_int = 0; tmp_int = 0;
if (q_index > 0) if (q_index > 0)
{ {
while ((tmp_int < comp_size) && (vec_component[tmp_int].index <= q_index)) while ((tmp_int < comp_size)
{ && (vec_component[tmp_int].index <= q_index))
tmp_int = tmp_int+1; tmp_int = tmp_int+1;
}
if (tmp_int < comp_size) if (tmp_int < comp_size)
{
vec_component[tmp_int-1].state_set.insert((*iter_map).first); vec_component[tmp_int-1].state_set.insert((*iter_map).first);
}
else else
{
vec_component[comp_size-1].state_set.insert((*iter_map).first); vec_component[comp_size-1].state_set.insert((*iter_map).first);
} }
} }
}
state* start_state = aut_counter->get_init_state(); state* start_state = aut_counter->get_init_state();
if (comp_size != 1) if (comp_size != 1)
{ {
todo_trace.push_back(pair_state_iter(start_state, aut_counter->succ_iter(start_state))); tgba_succ_iterator* i = aut_counter->succ_iter(start_state);
todo_trace.push_back(pair_state_iter(start_state, i));
for (int k = 0; k < comp_size-1; k++) for (int k = 0; k < comp_size-1; k++)
{ {
/// We build a path trought all SCC in the stack : a // We build a path trought all SCC in the stack : a
///possible prefixe for a counter example. // possible prefixe for a counter example.
while (!todo_trace.empty()) while (!todo_trace.empty())
{ {
pair_state_iter started_from = todo_trace.front(); pair_state_iter started_from = todo_trace.front();
todo_trace.pop_front(); todo_trace.pop_front();
(started_from.second)->first(); started_from.second->first();
for ((started_from.second)->first(); !started_from.second->done(); started_from.second->next()) for (started_from.second->first();
!started_from.second->done();
started_from.second->next())
{ {
const state* curr_state =(started_from.second)->current_state(); const state* curr_state =
connected_component::set_of_state::iterator iter_set = vec_component[k+1].state_set.find(curr_state); started_from.second->current_state();
connected_component::set_of_state::iterator iter_set =
vec_component[k+1].state_set.find(curr_state);
if (iter_set != vec_component[k+1].state_set.end()) if (iter_set != vec_component[k+1].state_set.end())
{ {
const state* curr_father = started_from.first; const state* curr_father = started_from.first;
seq.push_front(*iter_set); seq.push_front(*iter_set);
seq.push_front(curr_father); seq.push_front(curr_father);
seen::iterator i_2 = seen_state_num.find(curr_father); seen::iterator i_2 =
seen_state_num.find(curr_father);
assert(i_2 != seen_state_num.end()); assert(i_2 != seen_state_num.end());
while ((vec_component[k].index < seen_state_num[curr_father]) && (seen_state_num[curr_father] != 1)) while ((vec_component[k].index
< seen_state_num[curr_father])
&& (seen_state_num[curr_father] != 1))
{ {
seq.push_front(path_map[curr_father]); seq.push_front(path_map[curr_father]);
curr_father = path_map[curr_father]; curr_father = path_map[curr_father];
seen::iterator i_3 = seen_state_num.find(curr_father); seen::iterator i_3 =
seen_state_num.find(curr_father);
assert(i_3 != seen_state_num.end()); assert(i_3 != seen_state_num.end());
} }
vec_sequence[k] = seq; vec_sequence[k] = seq;
@ -327,25 +332,33 @@ connected_component::set_of_state::iterator iter_set = vec_component[k+1].state_
todo_trace.clear(); todo_trace.clear();
break; break;
} }
else else
{ {
connected_component::set_of_state::iterator i_s = vec_component[k].state_set.find(curr_state); connected_component::set_of_state::iterator i_s =
vec_component[k].state_set.find(curr_state);
if (i_s != vec_component[k].state_set.end()) if (i_s != vec_component[k].state_set.end())
{ {
path_state::iterator i_path = path_map.find(curr_state); path_state::iterator i_path =
seen::iterator i_seen = seen_state_num.find(curr_state); path_map.find(curr_state);
seen::iterator i_seen =
seen_state_num.find(curr_state);
if (i_seen != seen_state_num.end() && seen_state_num[curr_state] > 0 && i_path == path_map.end()) if (i_seen != seen_state_num.end()
&& seen_state_num[curr_state] > 0
&& i_path == path_map.end())
{ {
todo_trace.push_back(pair_state_iter(curr_state, aut_counter->succ_iter(curr_state))); todo_trace.
push_back(pair_state_iter(curr_state,
aut_counter->succ_iter(curr_state)));
path_map[curr_state] = started_from.first; path_map[curr_state] = started_from.first;
} }
} }
} }
} }
} }
todo_trace.push_back(pair_state_iter(vec_sequence[k].back(), aut_counter->succ_iter(vec_sequence[k].back()))); todo_trace.
push_back(pair_state_iter(vec_sequence[k].back(),
aut_counter->succ_iter(vec_sequence[k].back())));
} }
} }
else else
@ -354,7 +367,8 @@ connected_component::set_of_state::iterator iter_set = vec_component[k+1].state_
} }
for (int n_ = 0; n_ < comp_size-1; n_++) for (int n_ = 0; n_ < comp_size-1; n_++)
{ {
for (state_sequence::iterator it = vec_sequence[n_].begin(); it != vec_sequence[n_].end(); it++) for (state_sequence::iterator it = vec_sequence[n_].begin();
it != vec_sequence[n_].end(); it++)
{ {
seq_counter.push_back(*it); seq_counter.push_back(*it);
} }
@ -368,14 +382,17 @@ connected_component::set_of_state::iterator iter_set = vec_component[k+1].state_
} }
} }
/// \brief complete the path build by accepting_path to get the /// \brief complete the path build by accepting_path to get the period.
///period (cycle).
void void
emptiness_check::complete_cycle(const spot::tgba* aut_counter, const connected_component& comp_path, const state* from_state,const state* to_state) emptiness_check::complete_cycle(const spot::tgba* aut_counter,
const connected_component& comp_path,
const state* from_state,
const state* to_state)
{ {
if (seen_state_num[from_state] != seen_state_num[to_state]) if (seen_state_num[from_state] != seen_state_num[to_state])
{ {
std::map <const spot::state*, state_proposition, spot::state_ptr_less_than> complete_map; std::map<const spot::state*, state_proposition,
spot::state_ptr_less_than> complete_map;
std::deque<pair_state_iter> todo_complete; std::deque<pair_state_iter> todo_complete;
spot::tgba_succ_iterator* ite = aut_counter->succ_iter(from_state); spot::tgba_succ_iterator* ite = aut_counter->succ_iter(from_state);
todo_complete.push_back(pair_state_iter(from_state, ite)); todo_complete.push_back(pair_state_iter(from_state, ite));
@ -389,7 +406,8 @@ connected_component::set_of_state::iterator iter_set = vec_component[k+1].state_
for (iter_s->first(); !iter_s->done(); iter_s->next()) for (iter_s->first(); !iter_s->done(); iter_s->next())
{ {
const state* curr_state = (started_.second)->current_state(); const state* curr_state = (started_.second)->current_state();
connected_component::set_of_state::iterator i_set = comp_path.state_set.find(curr_state); connected_component::set_of_state::iterator i_set =
comp_path.state_set.find(curr_state);
if (i_set != comp_path.state_set.end()) if (i_set != comp_path.state_set.end())
{ {
if (curr_state->compare(to_state) == 0) if (curr_state->compare(to_state) == 0)
@ -399,17 +417,22 @@ connected_component::set_of_state::iterator iter_set = vec_component[k+1].state_
tmp_comp.push_front(state_proposition(curr_state, curr_condition)); tmp_comp.push_front(state_proposition(curr_state, curr_condition));
while (curr_father->compare(from_state) != 0) while (curr_father->compare(from_state) != 0)
{ {
tmp_comp.push_front(state_proposition(curr_father, complete_map[curr_father].second)); tmp_comp.push_front(state_proposition(curr_father,
complete_map[curr_father].second));
curr_father = complete_map[curr_father].first; curr_father = complete_map[curr_father].first;
} }
emptiness_check::periode.splice(periode.end(), tmp_comp); emptiness_check::periode.splice(periode.end(),
tmp_comp);
todo_complete.clear(); todo_complete.clear();
break; break;
} }
else else
{ {
todo_complete.push_back(pair_state_iter(curr_state, aut_counter->succ_iter(curr_state))); todo_complete.push_back(pair_state_iter(curr_state,
complete_map[curr_state] = state_proposition(started_.first, iter_s->current_condition()); aut_counter->succ_iter(curr_state)));
complete_map[curr_state] =
state_proposition(started_.first,
iter_s->current_condition());
} }
} }
} }
@ -421,7 +444,9 @@ connected_component::set_of_state::iterator iter_set = vec_component[k+1].state_
/// all accepting conditions. This path is the first part of the /// all accepting conditions. This path is the first part of the
/// period. /// period.
void void
emptiness_check::accepting_path(const spot::tgba* aut_counter, const connected_component& comp_path, const spot::state* start_path, bdd to_accept) emptiness_check::accepting_path(const spot::tgba* aut_counter,
const connected_component& comp_path,
const spot::state* start_path, bdd to_accept)
{ {
seen seen_priority; seen seen_priority;
std::stack<triplet> todo_path; std::stack<triplet> todo_path;
@ -447,17 +472,23 @@ void
else else
{ {
state* curr_state = iter_->current_state(); state* curr_state = iter_->current_state();
connected_component::set_of_state::iterator it_set = comp_path.state_set.find(curr_state); connected_component::set_of_state::iterator it_set =
comp_path.state_set.find(curr_state);
if (it_set != comp_path.state_set.end()) if (it_set != comp_path.state_set.end())
{ {
seen::iterator i = seen_priority.find(curr_state); seen::iterator i = seen_priority.find(curr_state);
if (i == seen_priority.end()) if (i == seen_priority.end())
{ {
tgba_succ_iterator* c_iter = aut_counter->succ_iter(curr_state); tgba_succ_iterator* c_iter =
bdd curr_bdd = bdd_apply(iter_->current_accepting_conditions(), step_.second, bddop_or); aut_counter->succ_iter(curr_state);
bdd curr_bdd =
bdd_apply(iter_->current_accepting_conditions(),
step_.second, bddop_or);
c_iter->first(); c_iter->first();
todo_path.push(triplet(pair_state_iter(curr_state, c_iter), curr_bdd)); todo_path.push(triplet(pair_state_iter(curr_state, c_iter),
tmp_lst.push_back(state_proposition(curr_state, iter_->current_condition())); curr_bdd));
tmp_lst.push_back(state_proposition(curr_state,
iter_->current_condition()));
seen_priority[curr_state] = seen_state_num[curr_state]; seen_priority[curr_state] = seen_state_num[curr_state];
} }
else else
@ -476,12 +507,15 @@ void
{ {
cycle_path tmp(tmp_lst); cycle_path tmp(tmp_lst);
best_lst = tmp; best_lst = tmp;
spot::bdd_print_dot(std::cout, aut_counter->get_dict(),step_.second); spot::bdd_print_dot(std::cout,
aut_counter->get_dict(),
step_.second);
} }
} }
else else
{ {
if (bddtrue == bdd_apply(best_in, curr_in, bddop_imp)) if (bddtrue == bdd_apply(best_in, curr_in,
bddop_imp))
{ {
cycle_path tmp(tmp_lst); cycle_path tmp(tmp_lst);
best_lst = tmp; best_lst = tmp;
@ -494,7 +528,8 @@ void
bdd last_ = iter_->current_accepting_conditions(); bdd last_ = iter_->current_accepting_conditions();
bdd prop_ = iter_->current_condition(); bdd prop_ = iter_->current_condition();
tmp_acc = bdd_apply(last_, step_.second, bddop_or); tmp_acc = bdd_apply(last_, step_.second, bddop_or);
tmp_lst.push_back(state_proposition(curr_state, prop_)); tmp_lst.push_back(state_proposition(curr_state,
prop_));
cycle_path tmp(tmp_lst); cycle_path tmp(tmp_lst);
best_lst = tmp; best_lst = tmp;
best_acc = tmp_acc; best_acc = tmp_acc;
@ -503,17 +538,17 @@ void
} }
} }
iter_->next(); iter_->next();
} }
} }
for (cycle_path::iterator it = best_lst.begin(); it != best_lst.end(); it++) for (cycle_path::iterator it = best_lst.begin();
{ it != best_lst.end(); it++)
emptiness_check::periode.push_back(*it); emptiness_check::periode.push_back(*it);
}
if (best_acc != to_accept) if (best_acc != to_accept)
{ {
bdd rec_to_acc = bdd_apply(to_accept, !best_acc, bddop_and); bdd rec_to_acc = bdd_apply(to_accept, !best_acc, bddop_and);
emptiness_check::accepting_path(aut_counter, comp_path, periode.back().first, rec_to_acc); emptiness_check::accepting_path(aut_counter, comp_path,
periode.back().first, rec_to_acc);
} }
else else
{ {
@ -522,7 +557,8 @@ void
{ {
/// The path contains all accepting conditions. Then we /// The path contains all accepting conditions. Then we
///complete the cycle in this SCC by calling complete_cycle. ///complete the cycle in this SCC by calling complete_cycle.
complete_cycle(aut_counter, comp_path, periode.back().first, seq_counter.back()); complete_cycle(aut_counter, comp_path, periode.back().first,
seq_counter.back());
} }
} }
} }

91
src/tgbaalgos/emptinesscheck.hh
View file

@ -1,6 +1,5 @@
#ifndef SPOT_EMPTINESS_CHECK_HH #ifndef SPOT_EMPTINESS_CHECK_HH
# define SPOT_EMPTINESS_CHECK_HH # define SPOT_EMPTINESS_CHECK_HH
//#include "tgba/bddfactory.hh"
#include "tgba/tgba.hh" #include "tgba/tgba.hh"
#include "tgba/statebdd.hh" #include "tgba/statebdd.hh"
#include "tgba/tgbabddfactory.hh" #include "tgba/tgbabddfactory.hh"
@ -14,29 +13,26 @@
#include <utility> #include <utility>
#include <ostream> #include <ostream>
/// \brief Emptiness check on spot::tgba
namespace spot namespace spot
{ {
class connected_component class connected_component
{ {
/// During the Depth path we keep the connected component that we met. // During the Depth path we keep the connected component that we met.
public: public:
connected_component(); connected_component();
connected_component(int i, bdd a); connected_component(int i, bdd a);
virtual virtual ~connected_component();
~connected_component(); bool isAccepted(tgba* aut);
std::string
to_string_component();
bool
isAccepted(tgba* aut);
public: public:
int index; int index;
/// The bdd condition is the union of all accepting condition of /// The bdd condition is the union of all accepting condition of
/// transitions which connect the states of the connected component. /// transitions which connect the states of the connected component.
bdd condition; bdd condition;
typedef std::set<const spot::state*, spot::state_ptr_less_than> set_of_state; typedef std::set<const spot::state*,
spot::state_ptr_less_than> set_of_state;
/// for the counter example we need to know all the states of the /// for the counter example we need to know all the states of the
/// component /// component
set_of_state state_set; set_of_state state_set;
@ -48,7 +44,6 @@ namespace spot
class emptiness_check class emptiness_check
{ {
typedef std::pair<const spot::state*, tgba_succ_iterator*> pair_state_iter; typedef std::pair<const spot::state*, tgba_succ_iterator*> pair_state_iter;
typedef std::pair<pair_state_iter, bdd> triplet; typedef std::pair<pair_state_iter, bdd> triplet;
typedef std::map<const spot::state*, int, spot::state_ptr_less_than> seen; typedef std::map<const spot::state*, int, spot::state_ptr_less_than> seen;
@ -57,44 +52,27 @@ namespace spot
typedef std::list<state_proposition> cycle_path; typedef std::list<state_proposition> cycle_path;
public: public:
virtual
~emptiness_check();
emptiness_check();
/// this function remove all accessible state from a given /// this function remove all accessible state from a given
/// state. In other words, it removes the strongly connected /// state. In other words, it removes the strongly connected
/// component that contents this state. /// component that contents this state.
/// \brief Emptiness check on spot::tgba /// \brief Emptiness check on spot::tgba
void void
remove_component(const tgba& aut, seen& state_map, const spot::state* start_delete); remove_component(const tgba& aut, seen& state_map,
const spot::state* start_delete);
/// This is based on the following papers. /// This function returns true if the automata's language is empty,
/// \verbatim /// and builds a stack of SCC.
/// @InProceedings{ couvreur.00.lacim, ///
/// author = {Jean-Michel Couvreur}, /// This is based on the following paper.
/// title = {Un point de vue symbolique sur la logique temporelle
/// lin{\'e}aire},
/// booktitle = {Actes du Colloque LaCIM 2000},
/// month = {August},
/// year = {2000},
/// pages = {131--140},
/// volume = {27},
/// series = {Publications du LaCIM},
/// publisher = {Universit{\'e} du Qu{\'e}bec {\`a} Montr{\'e}al},
/// editor = {Pierre Leroux}
/// }
/// \endverbatim
/// and
/// \verbatim /// \verbatim
/// @InProceedings{couvreur.99.fm, /// @InProceedings{couvreur.99.fm,
/// author = {Jean-Michel Couvreur}, /// author = {Jean-Michel Couvreur},
/// title = {On-the-fly Verification of Temporal Logic}, /// title = {On-the-fly Verification of Temporal Logic},
/// pages = {253--271}, /// pages = {253--271},
/// editor = {Jeannette M. Wing and Jim Woodcock and Jim Davies}, /// editor = {Jeannette M. Wing and Jim Woodcock and Jim Davies},
/// booktitle = {Proceedings of the World Congress on Formal Methods in the /// booktitle = {Proceedings of the World Congress on Formal Methods in
/// Development of Computing Systems (FM'99)}, /// the Development of Computing Systems (FM'99)},
/// publisher = {Springer-Verlag}, /// publisher = {Springer-Verlag},
/// series = {Lecture Notes in Computer Science}, /// series = {Lecture Notes in Computer Science},
/// volume = {1708}, /// volume = {1708},
@ -104,19 +82,13 @@ virtual
/// isbn = {3-540-66587-0} /// isbn = {3-540-66587-0}
/// } /// }
/// \endverbatim /// \endverbatim
/// This function return true if the automata is empty and build a stack of SCC. bool tgba_emptiness_check(const spot::tgba* aut_check);
bool
tgba_emptiness_check(const spot::tgba* aut_check);
/// counter_example check if the automata is empty. If it is not, /// Compute a counter example if tgba_emptiness_check() returned false.
///then this function return an accepted word (a trace) and an accepted sequence. void counter_example(const spot::tgba* aut_counter);
void
counter_example(const spot::tgba* aut_counter);
std::ostream&
print_result(std::ostream& os, const spot::tgba* aut, const tgba* restrict = 0) const;
std::ostream& print_result(std::ostream& os, const spot::tgba* aut,
const tgba* restrict = 0) const;
std::stack<bdd> arc_accepting; std::stack<bdd> arc_accepting;
std::stack<connected_component> root_component; std::stack<connected_component> root_component;
@ -126,21 +98,20 @@ std::ostream&
private: private:
std::stack<pair_state_iter> todo; std::stack<pair_state_iter> todo;
std::vector<state_sequence> vec_sequence; std::vector<state_sequence> vec_sequence;
/// This function is called by counter_example to find a path
/// which contents all accepting conditions in the accepted SCC (get all the
/// accepting conditions).
/// Called by counter_example to find a path which traverses all
/// accepting conditions in the accepted SCC.
void void
accepting_path (const spot::tgba* aut_counter, const connected_component& comp_path, const spot::state* start_path, bdd to_accept); accepting_path (const spot::tgba* aut_counter,
const connected_component& comp_path,
const spot::state* start_path, bdd to_accept);
/// This function is called by counter_example (after
//accepting_path) to complete the cycle that caraterise the periode
//of the counter example. Append a sequence to the path given by accepting_path.
void
complete_cycle(const spot::tgba* aut_counter, const connected_component& comp_path, const state* from_state,const state* to_state);
/// Complete a cycle that caraterise the period of the counter
/// example. Append a sequence to the path given by accepting_path.
void complete_cycle(const spot::tgba* aut_counter,
const connected_component& comp_path,
const state* from_state,const state* to_state);
}; };
} }
#endif // SPOT_EMPTINESS_CHECK_HH #endif // SPOT_EMPTINESS_CHECK_HH