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* src/tgbaalgos/tau03opt.cc: Fix a memory leak in the computation of

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accepting runs

* src/misc/timer.hh: Include cassert.
This commit is contained in:
Denis Poitrenaud 2004-12-07 17:58:16 +00:00
parent e9b260c081
commit acfcade04a
3 changed files with 225 additions and 205 deletions
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7
ChangeLog
View file

@ -1,3 +1,10 @@
2004-11-25 Denis Poitrenaud <Denis.Poitrenaud@lip6.fr>
* src/tgbaalgos/tau03opt.cc: Fix a memory leak in the computation of
accepting runs
* src/misc/timer.hh: Include cassert.
2004-12-01 Alexandre Duret-Lutz <adl@src.lip6.fr> 2004-12-01 Alexandre Duret-Lutz <adl@src.lip6.fr>
* src/misc/timer.cc: Include cassert. * src/misc/timer.cc: Include cassert.

1
src/misc/timer.hh
View file

@ -22,6 +22,7 @@
#ifndef SPOT_MISC_TIMER_HH #ifndef SPOT_MISC_TIMER_HH
# define SPOT_MISC_TIMER_HH # define SPOT_MISC_TIMER_HH
# include <cassert>
# include <iosfwd> # include <iosfwd>
# include <string> # include <string>
# include <map> # include <map>

422
src/tgbaalgos/tau03opt.cc
View file

@ -26,7 +26,7 @@
/// dfs: /// dfs:
/// - favorize the arcs conducting to the blue stack (the states of color /// - favorize the arcs conducting to the blue stack (the states of color
/// cyan) /// cyan)
/// - in this category, favorize the arcs labelled /// - in this category, favorize the labelled arcs
/// - for the remaining ones, favorize the arcs labelled by the greatest /// - for the remaining ones, favorize the arcs labelled by the greatest
/// number of new acceptance conditions (notice that this number may evolve /// number of new acceptance conditions (notice that this number may evolve
/// after the visit of previous successors). /// after the visit of previous successors).
@ -50,6 +50,7 @@
#include "emptiness_stats.hh" #include "emptiness_stats.hh"
#include "tau03opt.hh" #include "tau03opt.hh"
#include "weight.hh" #include "weight.hh"
#include "bfssteps.hh"
namespace spot namespace spot
{ {
@ -333,12 +334,213 @@ namespace spot
class result: public emptiness_check_result class result: public emptiness_check_result
{ {
private:
typedef Sgi::hash_set<const state*,
state_ptr_hash, state_ptr_equal> state_set;
class shortest_path: public bfs_steps
{
public:
shortest_path(const tgba* a, const state* t,
const state_set& d, heap& h)
: bfs_steps(a), target(t), dead(d), h(h)
{
}
~shortest_path()
{
}
const state*
search(const state* start, tgba_run::steps& l)
{
const state* s = filter(start);
if (s)
return this->bfs_steps::search(s, l);
else
return 0;
}
const state*
filter(const state* s)
{
typename heap::color_ref c = h.get_color_ref(s);
if (c.is_white())
{
delete s;
return 0;
}
else if (dead.find(s) != dead.end())
return 0;
seen.insert(s);
return s;
}
const state_set&
get_seen() const
{
return seen;
}
bool
match(tgba_run::step&, const state* dest)
{
return target->compare(dest) == 0;
}
private:
state_set seen;
const state* target;
const state_set& dead;
heap& h;
};
stack_type st1;
tau03_opt_search& ms_;
void complete_cycle(tgba_run::steps& cycle, bdd& covered_acc,
const tgba_run::step& start, tgba_run::steps& path,
const state_set& dead)
{
tgba_run::steps new_cycle;
// find the minimal path between st1.back().s and st1.front().s
if (st1.back().s->compare(st1.front().s)!=0)
{
shortest_path s(ms_.a_, st1.front().s, dead, ms_.h);
const state* res = s.search(st1.back().s, new_cycle);
assert(res && res->compare(st1.front().s) == 0);
(void)res;
for (tgba_run::steps::const_iterator it = new_cycle.begin();
it != new_cycle.end(); ++it)
covered_acc |= it->acc;
}
// traverse the accepting transition
covered_acc |= start.acc;
tgba_run::step s = { st1.front().s->clone(), start.label, start.acc };
new_cycle.push_back(s);
// follow the minimal path returning to st1.back().s
for (tgba_run::steps::const_iterator it = path.begin();
it != path.end(); ++it)
covered_acc |= it->acc;
new_cycle.splice(new_cycle.end(), path);
// concat this new loop to the existing ones
cycle.splice(cycle.end(), new_cycle);
}
bool dfs_result(const state* target, tgba_run::steps& cycle,
bdd& covered_acc)
{
state_set seen, dead;
seen.insert(target);
while (!st1.empty())
{
stack_item& f = st1.front();
trace << "DFS1 treats: " << a_->format_state(f.s) << std::endl;
if (!f.it->done())
{
const state *s_prime = f.it->current_state();
trace << " Visit the successor: "
<< a_->format_state(s_prime) << std::endl;
bdd label = f.it->current_condition();
bdd acc = f.it->current_acceptance_conditions();
f.it->next();
typename heap::color_ref c_prime =
ms_.h.get_color_ref(s_prime);
if (!c_prime.is_white())
{
if (dead.find(s_prime) != dead.end())
{
trace << " it is dead, pop it" << std::endl;
}
else if (seen.find(s_prime) == seen.end())
{
trace << " it is not seen, go down" << std::endl;
seen.insert(s_prime);
tgba_succ_iterator* i = a_->succ_iter(s_prime);
i->first();
st1.push_front(stack_item(s_prime, i, label, acc));
}
else if ((acc & covered_acc) != acc)
{
trace << " a propagation is needed, start a search"
<< std::endl;
tgba_run::step s = {s_prime, label, acc};
if (search(s, target, dead, cycle, covered_acc))
return true;
}
else
{
trace << " already seen, pop it" << std::endl;
}
}
else
delete s_prime;
}
else
{
trace << " all the successors have been visited"
<< std::endl;
stack_item f_dest(f);
delete st1.front().it;
st1.pop_front();
if (!st1.empty() && (f_dest.acc & covered_acc) != f_dest.acc)
{
trace << " a propagation is needed, start a search"
<< std::endl;
tgba_run::step s = {f_dest.s,
f_dest.label,
f_dest.acc};
if (search(s, target, dead, cycle, covered_acc))
return true;
}
else
{
trace << " no propagation needed, pop it" << std::endl;
}
}
}
return false;
}
bool search(const tgba_run::step& start, const state* target,
state_set& dead, tgba_run::steps& cycle, bdd& covered_acc)
{
tgba_run::steps path;
if (start.s->compare(target)==0)
{
trace << " complete the cycle" << std::endl;
complete_cycle(cycle, covered_acc, start, path, dead);
return covered_acc == ms_.all_acc;
}
shortest_path s(ms_.a_, target, dead, ms_.h);
const state* res = s.search(start.s, path);
if (res)
{
assert(res->compare(target) == 0);
trace << " complete the cycle" << std::endl;
complete_cycle(cycle, covered_acc, start, path, dead);
return covered_acc == ms_.all_acc;
}
state_set::const_iterator it;
for (it = s.get_seen().begin(); it != s.get_seen().end(); ++it)
dead.insert(*it);
return false;
}
public: public:
result(tau03_opt_search& ms) result(tau03_opt_search& ms)
: emptiness_check_result(ms.a_), : emptiness_check_result(ms.a_),
ms_(ms) ms_(ms)
{ {
} }
virtual ~result() virtual ~result()
{ {
while (!st1.empty()) while (!st1.empty())
@ -346,12 +548,8 @@ namespace spot
delete st1.front().it; delete st1.front().it;
st1.pop_front(); st1.pop_front();
} }
while (!st2.empty())
{
delete st2.front().it;
st2.pop_front();
}
} }
virtual tgba_run* accepting_run() virtual tgba_run* accepting_run()
{ {
assert(!ms_.st_blue.empty()); assert(!ms_.st_blue.empty());
@ -394,212 +592,26 @@ namespace spot
if (ms_.all_acc != covered_acc) if (ms_.all_acc != covered_acc)
{ {
ms_.push(st1, target, bddfalse, bddfalse); // try to minimize the first loop in run->cycle ??
bool b = dfs1(target, run->cycle, covered_acc); // what transitions have to be preserved (it depend on
// the detection (in the blue or red dfs) ??
tgba_succ_iterator* i = a_->succ_iter(target);
i->first();
st1.push_front(stack_item(target, i, bddfalse, bddfalse));
bool b = dfs_result(target, run->cycle, covered_acc);
assert(b); assert(b);
(void)b; (void)b;
while (!st1.empty())
{
delete st1.front().it;
st1.pop_front();
}
} }
return run; return run;
} }
private: };
stack_type st1, st2;
tau03_opt_search& ms_;
void complete_cycle(tgba_run::steps& cycle, bdd& covered_acc)
{
tgba_run::steps new_cycle;
typename stack_type::const_reverse_iterator i, j, end;
i = j = st1.rbegin(); ++j;
end = st1.rend();
for (; j != end; ++i, ++j)
{
covered_acc |= j->acc;
tgba_run::step s = { i->s->clone(), j->label, j->acc };
new_cycle.push_back(s);
}
j = st2.rbegin();
covered_acc |= j->acc;
tgba_run::step s = { i->s->clone(), j->label, j->acc };
new_cycle.push_back(s);
i = j; ++j;
end = st2.rend();
for (; j != end; ++i, ++j)
{
covered_acc |= j->acc;
tgba_run::step s = { i->s->clone(), j->label, j->acc };
new_cycle.push_back(s);
}
cycle.splice(cycle.end(), new_cycle);
}
typedef Sgi::hash_map<const state*, bdd,
state_ptr_hash, state_ptr_equal> seen_type;
bool dfs1(const state* target, tgba_run::steps& cycle, bdd& covered_acc)
{
seen_type seen;
seen.insert(std::make_pair(target, covered_acc));
while (!st1.empty())
{
stack_item& f = st1.front();
trace << "DFS1 treats: " << a_->format_state(f.s) << std::endl;
if (!f.it->done())
{
const state *s_prime = f.it->current_state();
trace << " Visit the successor: "
<< a_->format_state(s_prime) << std::endl;
bdd label = f.it->current_condition();
bdd acc = f.it->current_acceptance_conditions();
f.it->next();
typename heap::color_ref c_prime =
ms_.h.get_color_ref(s_prime);
if (!c_prime.is_white())
{
seen_type::iterator it = seen.find(s_prime);
if (it == seen.end())
{
trace << " it is not seen, go down" << std::endl;
seen.insert(std::make_pair(s_prime, covered_acc));
ms_.push(st1, s_prime, label, acc);
}
else if ((acc & (it->second | covered_acc)) != acc)
{
it->second |= acc;
ms_.push(st2, s_prime, label, acc);
trace << " a propagation is needed, start a dfs2"
<< std::endl;
if (dfs2(seen, target, cycle, covered_acc, acc))
return true;
}
}
else
delete s_prime;
}
else
{
trace << " all the successors have been visited"
<< std::endl;
stack_item f_dest(f);
ms_.pop(st1);
if (!st1.empty())
{
seen_type::iterator it = seen.find(f_dest.s);
assert(it != seen.end());
if ((f_dest.acc & (it->second | covered_acc)) !=
f_dest.acc)
{
it->second |= f_dest.acc | covered_acc;
ms_.push(st2, f_dest.s, f_dest.label, f_dest.acc);
trace << " a propagation is needed, start a dfs2"
<< std::endl;
if (dfs2(seen, target, cycle, covered_acc,
f_dest.acc))
return true;
}
}
}
}
return false;
}
bool dfs2(seen_type& seen, const state* target, tgba_run::steps& cycle,
bdd& covered_acc, const bdd& acu)
{
if (st2.front().s->compare(target)==0)
{
trace << " complete the cycle" << std::endl;
complete_cycle(cycle, covered_acc);
delete st2.front().it;
st2.pop_front();
if (covered_acc == ms_.all_acc)
{
trace << " the cycle is complete, report it"
<< std::endl;
return true;
}
return false;
}
typedef Sgi::hash_set<const state*,
state_ptr_hash, state_ptr_equal> l_seen_type;
l_seen_type l_seen;
while (!st2.empty())
{
stack_item& f = st2.front();
trace << "DFS2 treats: " << a_->format_state(f.s) << std::endl;
if (!f.it->done())
{
const state *s_prime = f.it->current_state();
trace << " Visit the successor: "
<< a_->format_state(s_prime) << std::endl;
bdd label = f.it->current_condition();
bdd acc = f.it->current_acceptance_conditions();
f.it->next();
typename heap::color_ref c_prime =
ms_.h.get_color_ref(s_prime);
if (!c_prime.is_white())
{
seen_type::iterator it = seen.find(s_prime);
if (it != seen.end())
{
if ((acu & (it->second | covered_acc)) != acu)
{
it->second |= acu | covered_acc;
ms_.push(st2, s_prime, label, acc);
if (s_prime->compare(target)==0)
{
trace << " complete the cycle" << std::endl;
complete_cycle(cycle, covered_acc);
while (!st2.empty())
{
delete st2.front().it;
st2.pop_front();
}
if (covered_acc == ms_.all_acc)
{
trace << " the cycle is complete, "
<< "report it" << std::endl;
return true;
}
else
return false;
}
}
}
else
{
if (l_seen.find(s_prime) == l_seen.end())
{
l_seen.insert(s_prime);
ms_.push(st2, s_prime, label, acc);
trace << " the propagation continues"
<< std::endl;
}
}
}
else
{
trace << " it is unknown, pop it"
<< std::endl;
delete s_prime;
}
}
else
{
trace << " all the successors have been visited, pop it"
<< std::endl;
ms_.pop(st2);
}
}
return false;
}
};
}; };