Add an implementation of TGTA minimization
* src/ta/taexplicit.cc, src/ta/taexplicit.hh: Bug fix TGTA * src/taalgos/minimize.cc,src/taalgos/minimize.hh: TGTA minimization * src/taalgos/tgba2ta.cc: add a TGTA minimization command (uses -Rm) * src/taalgos/minimize.cc, src/taalgos/minimize.hh (minimize_tgbta): New function. * src/taalgos/tgba2ta.cc: Set livelock-accepting flag of TGTA states to false so they can be merged with other states. * src/ta/taexplicit.cc (hash): Use id. * src/ta/taexplicit.hh: Cosmetics.
This commit is contained in:
Ala-Eddine Ben-Salem
Alexandre Duret-Lutz
parent
c882eadda6
commit
ed27dab306
5 changed files with 360 additions and 315 deletions
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@ -34,7 +34,7 @@
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#include "ltlast/allnodes.hh"
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#include "misc/hash.hh"
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#include "misc/bddlt.hh"
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#include "ta/taproduct.hh"
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#include "ta/tgbtaexplicit.hh"
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#include "taalgos/statessetbuilder.hh"
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#include "tgba/tgbaexplicit.hh"
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#include "tgba/bddprint.hh"
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@ -44,6 +44,7 @@ namespace spot
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typedef Sgi::hash_set<const state*, state_ptr_hash, state_ptr_equal> hash_set;
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typedef Sgi::hash_map<const state*, unsigned, state_ptr_hash, state_ptr_equal>
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hash_map;
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typedef std::list<hash_set*> partition_t;
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namespace
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{
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@ -70,13 +71,10 @@ namespace spot
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}
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}
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// From the base automaton and the list of sets, build the minimal
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// tgbaulting automaton
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ta*
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build_result(const ta* a, std::list<hash_set*>& sets)
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// From the base automaton and the list of sets, build the minimal automaton
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void
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build_result(const ta* a, std::list<hash_set*>& sets, tgba_explicit_number* result_tgba, ta_explicit* result)
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{
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tgba_explicit_number* tgba = new tgba_explicit_number(a->get_dict());
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ta_explicit* ta = new ta_explicit(tgba, a->all_acceptance_conditions());
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// For each set, create a state in the tgbaulting automaton.
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// For a state s, state_num[s] is the number of the state in the minimal
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@ -104,7 +102,7 @@ namespace spot
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const state* src = *hit;
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unsigned src_num = state_num[src];
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state* tgba_state = tgba->add_state(src_num);
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state* tgba_state = result_tgba->add_state(src_num);
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bdd tgba_condition = bddtrue;
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bool is_initial_state = a->is_initial_state(src);
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if ((a->get_artificial_initial_state() == 0) && is_initial_state)
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@ -112,24 +110,24 @@ namespace spot
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bool is_accepting_state = a->is_accepting_state(src);
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bool is_livelock_accepting_state = a->is_livelock_accepting_state(src);
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state_ta_explicit* new_src = new state_ta_explicit(tgba_state->clone(),
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state_ta_explicit* new_src = new state_ta_explicit(tgba_state,
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tgba_condition, is_initial_state, is_accepting_state,
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is_livelock_accepting_state);
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state_ta_explicit* ta_src = ta->add_state(new_src);
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state_ta_explicit* ta_src = result->add_state(new_src);
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if (ta_src != new_src)
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{
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new_src->destroy();
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delete new_src;
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}
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else if (a->get_artificial_initial_state() != 0)
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{
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if (a->get_artificial_initial_state() == src)
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ta->set_artificial_initial_state(new_src);
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result->set_artificial_initial_state(new_src);
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}
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else if (is_initial_state)
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{
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ta->add_to_initial_states_set(new_src);
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result->add_to_initial_states_set(new_src);
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}
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ta_succ_iterator* succit = a->succ_iter(src);
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@ -142,7 +140,7 @@ namespace spot
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if (i == state_num.end()) // Ignore useless destinations.
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continue;
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state* tgba_state = tgba->add_state(i->second);
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state* tgba_state = result_tgba->add_state(i->second);
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bdd tgba_condition = bddtrue;
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is_initial_state = a->is_initial_state(dst);
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if ((a->get_artificial_initial_state() == 0) && is_initial_state)
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@ -151,341 +149,381 @@ namespace spot
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bool is_livelock_accepting_state = a->is_livelock_accepting_state(
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dst);
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state_ta_explicit* new_dst = new state_ta_explicit(tgba_state->clone(),
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state_ta_explicit* new_dst = new state_ta_explicit(tgba_state,
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tgba_condition, is_initial_state, is_accepting_state,
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is_livelock_accepting_state);
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state_ta_explicit* ta_dst = ta->add_state(new_dst);
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state_ta_explicit* ta_dst = result->add_state(new_dst);
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if (ta_dst != new_dst)
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{
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new_dst->destroy();
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delete new_dst;
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}
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else if (a->get_artificial_initial_state() != 0)
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{
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if (a->get_artificial_initial_state() == dst)
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ta->set_artificial_initial_state(new_dst);
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result->set_artificial_initial_state(new_dst);
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}
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else if (is_initial_state)
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ta->add_to_initial_states_set(new_dst);
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result->add_to_initial_states_set(new_dst);
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ta->create_transition(ta_src, succit->current_condition(), succit->current_acceptance_conditions(), ta_dst);
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result->create_transition(ta_src, succit->current_condition(), succit->current_acceptance_conditions(), ta_dst);
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}
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delete succit;
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}
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return ta;
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}
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partition_t build_partition(const ta* ta_){
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partition_t cur_run;
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partition_t next_run;
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// The list of equivalent states.
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partition_t done;
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std::set<const state*> states_set = get_states_set(ta_);
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hash_set* I = new hash_set;
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// livelock acceptance states
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hash_set* G = new hash_set;
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// Buchi acceptance states
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hash_set* F = new hash_set;
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// Buchi and livelock acceptance states
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hash_set* G_F = new hash_set;
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// the other states (non initial and not in G, F and G_F)
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hash_set* S = new hash_set;
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std::set<const state*>::iterator it;
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spot::state* artificial_initial_state = ta_->get_artificial_initial_state();
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for (it = states_set.begin(); it != states_set.end(); it++)
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{
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const state* s = (*it);
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if (s == artificial_initial_state)
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{
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I->insert(s);
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}
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else if (artificial_initial_state == 0 && ta_->is_initial_state(s))
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{
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I->insert(s);
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}
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else if (ta_->is_livelock_accepting_state(s)
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&& ta_->is_accepting_state(s))
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{
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G_F->insert(s);
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}
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else if (ta_->is_accepting_state(s))
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{
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F->insert(s);
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}
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else if (ta_->is_livelock_accepting_state(s))
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{
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G->insert(s);
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}
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else
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{
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S->insert(s);
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}
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}
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hash_map state_set_map;
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// Size of ta_
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unsigned size = states_set.size() + 6;
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// Use bdd variables to number sets. set_num is the first variable
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// available.
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unsigned set_num = ta_->get_dict()->register_anonymous_variables(size, ta_);
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std::set<int> free_var;
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for (unsigned i = set_num; i < set_num + size; ++i)
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free_var.insert(i);
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std::map<int, int> used_var;
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{
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for (hash_set::const_iterator i = I->begin(); i != I->end(); ++i)
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{
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hash_set* cI = new hash_set;
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cI->insert(*i);
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done.push_back(cI);
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used_var[set_num] = 1;
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free_var.erase(set_num);
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state_set_map[*i] = set_num;
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set_num++;
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}
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}
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delete I;
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if (!G->empty())
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{
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unsigned s = G->size();
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unsigned num = set_num;
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set_num++;
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used_var[num] = s;
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free_var.erase(num);
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if (s > 1)
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cur_run.push_back(G);
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else
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done.push_back(G);
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for (hash_set::const_iterator i = G->begin(); i != G->end(); ++i)
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state_set_map[*i] = num;
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}
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else
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delete G;
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if (!F->empty())
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{
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unsigned s = F->size();
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unsigned num = set_num;
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set_num++;
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used_var[num] = s;
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free_var.erase(num);
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if (s > 1)
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cur_run.push_back(F);
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else
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done.push_back(F);
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for (hash_set::const_iterator i = F->begin(); i != F->end(); ++i)
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state_set_map[*i] = num;
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}
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else
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delete F;
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if (!G_F->empty())
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{
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unsigned s = G_F->size();
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unsigned num = set_num;
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set_num++;
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used_var[num] = s;
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free_var.erase(num);
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if (s > 1)
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cur_run.push_back(G_F);
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else
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done.push_back(G_F);
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for (hash_set::const_iterator i = G_F->begin(); i != G_F->end(); ++i)
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state_set_map[*i] = num;
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}
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else
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delete G_F;
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if (!S->empty())
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{
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unsigned s = S->size();
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unsigned num = set_num;
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set_num++;
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used_var[num] = s;
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free_var.erase(num);
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if (s > 1)
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cur_run.push_back(S);
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else
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done.push_back(S);
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for (hash_set::const_iterator i = S->begin(); i != S->end(); ++i)
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state_set_map[*i] = num;
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}
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else
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delete S;
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// A bdd_states_map is a list of formulae (in a BDD form) associated with a
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// destination set of states.
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typedef std::map<bdd, hash_set*, bdd_less_than> bdd_states_map;
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bool did_split = true;
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unsigned num = set_num;
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set_num++;
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used_var[num] = 1;
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free_var.erase(num);
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bdd bdd_false_acceptance_condition = bdd_ithvar(num);
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while (did_split)
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{
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did_split = false;
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while (!cur_run.empty())
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{
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// Get a set to process.
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hash_set* cur = cur_run.front();
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cur_run.pop_front();
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trace
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<< "processing " << format_hash_set(cur, ta_) << std::endl;
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hash_set::iterator hi;
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bdd_states_map bdd_map;
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for (hi = cur->begin(); hi != cur->end(); ++hi)
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{
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const state* src = *hi;
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bdd f = bddfalse;
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ta_succ_iterator* si = ta_->succ_iter(src);
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for (si->first(); !si->done(); si->next())
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{
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const state* dst = si->current_state();
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hash_map::const_iterator i = state_set_map.find(dst);
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assert(i != state_set_map.end());
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bdd current_acceptance_conditions =
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si->current_acceptance_conditions();
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if (current_acceptance_conditions == bddfalse)
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current_acceptance_conditions
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= bdd_false_acceptance_condition;
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f |= (bdd_ithvar(i->second) & si->current_condition()
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& current_acceptance_conditions);
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trace << "--------------f: " << bdd_format_accset(ta_->get_dict(),f) << std::endl;;
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}
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delete si;
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// Have we already seen this formula ?
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bdd_states_map::iterator bsi = bdd_map.find(f);
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if (bsi == bdd_map.end())
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{
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// No, create a new set.
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hash_set* new_set = new hash_set;
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new_set->insert(src);
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bdd_map[f] = new_set;
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}
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else
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{
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// Yes, add the current state to the set.
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bsi->second->insert(src);
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}
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}
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bdd_states_map::iterator bsi = bdd_map.begin();
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if (bdd_map.size() == 1)
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{
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// The set was not split.
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trace
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<< "set " << format_hash_set(bsi->second, ta_)
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<< " was not split" << std::endl;
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next_run.push_back(bsi->second);
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}
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else
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{
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for (; bsi != bdd_map.end(); ++bsi)
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{
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hash_set* set = bsi->second;
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// Free the number associated to these states.
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unsigned num = state_set_map[*set->begin()];
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assert(used_var.find(num) != used_var.end());
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unsigned left = (used_var[num] -= set->size());
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// Make sure LEFT does not become negative (hence bigger
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// than SIZE when read as unsigned)
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assert(left < size);
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if (left == 0)
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{
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used_var.erase(num);
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free_var.insert(num);
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}
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// Pick a free number
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assert(!free_var.empty());
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num = *free_var.begin();
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free_var.erase(free_var.begin());
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used_var[num] = set->size();
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for (hash_set::iterator hit = set->begin(); hit
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!= set->end(); ++hit)
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state_set_map[*hit] = num;
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// Trivial sets can't be splitted any further.
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if (set->size() == 1)
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{
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trace
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<< "set " << format_hash_set(set, ta_)
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<< " is minimal" << std::endl;
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done.push_back(set);
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}
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else
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{
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did_split = true;
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trace
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<< "set " << format_hash_set(set, ta_)
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<< " should be processed further" << std::endl;
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next_run.push_back(set);
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}
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}
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}
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delete cur;
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}
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if (did_split)
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trace
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<< "splitting did occur during this pass." << std::endl;
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//elsetrace << "splitting did not occur during this pass." << std::endl;
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std::swap(cur_run, next_run);
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}
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done.splice(done.end(), cur_run);
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#ifdef TRACE
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trace << "Final partition: ";
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for (partition_t::const_iterator i = done.begin(); i != done.end(); ++i)
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trace << format_hash_set(*i, ta_) << " ";
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trace << std::endl;
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#endif
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return done;
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}
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ta*
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minimize_ta(const ta* ta_)
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{
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typedef std::list<hash_set*> partition_t;
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partition_t cur_run;
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partition_t next_run;
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tgba_explicit_number* tgba = new tgba_explicit_number(ta_->get_dict());
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// The list of equivalent states.
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partition_t done;
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ta_explicit* res = new ta_explicit(tgba, ta_->all_acceptance_conditions());
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std::set<const state*> states_set = get_states_set(ta_);
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hash_set* I = new hash_set;
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partition_t partition = build_partition(ta_);
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// livelock acceptance states
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hash_set* G = new hash_set;
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// Buchi acceptance states
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hash_set* F = new hash_set;
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// Buchi and livelock acceptance states
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hash_set* G_F = new hash_set;
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// the other states (non initial and not in G, F and G_F)
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hash_set* S = new hash_set;
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std::set<const state*>::iterator it;
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spot::state* artificial_initial_state = ta_->get_artificial_initial_state();
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for (it = states_set.begin(); it != states_set.end(); it++)
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{
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const state* s = (*it);
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if (s == artificial_initial_state)
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{
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I->insert(s);
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}
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else if (artificial_initial_state == 0 && ta_->is_initial_state(s))
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{
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I->insert(s);
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}
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else if (ta_->is_livelock_accepting_state(s)
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&& ta_->is_accepting_state(s))
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{
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G_F->insert(s);
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}
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else if (ta_->is_accepting_state(s))
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{
|
||||
F->insert(s);
|
||||
}
|
||||
|
||||
else if (ta_->is_livelock_accepting_state(s))
|
||||
{
|
||||
G->insert(s);
|
||||
}
|
||||
else
|
||||
{
|
||||
S->insert(s);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
hash_map state_set_map;
|
||||
|
||||
// Size of ta_
|
||||
unsigned size = states_set.size() + 6;
|
||||
// Use bdd variables to number sets. set_num is the first variable
|
||||
// available.
|
||||
unsigned set_num = ta_->get_dict()->register_anonymous_variables(size, ta_);
|
||||
|
||||
std::set<int> free_var;
|
||||
for (unsigned i = set_num; i < set_num + size; ++i)
|
||||
free_var.insert(i);
|
||||
std::map<int, int> used_var;
|
||||
|
||||
{
|
||||
|
||||
for (hash_set::const_iterator i = I->begin(); i != I->end(); ++i)
|
||||
{
|
||||
hash_set* cI = new hash_set;
|
||||
cI->insert(*i);
|
||||
done.push_back(cI);
|
||||
|
||||
used_var[set_num] = 1;
|
||||
free_var.erase(set_num);
|
||||
state_set_map[*i] = set_num;
|
||||
set_num++;
|
||||
|
||||
}
|
||||
|
||||
}
|
||||
delete I;
|
||||
|
||||
if (!G->empty())
|
||||
{
|
||||
unsigned s = G->size();
|
||||
unsigned num = set_num;
|
||||
set_num++;
|
||||
used_var[num] = s;
|
||||
free_var.erase(num);
|
||||
if (s > 1)
|
||||
cur_run.push_back(G);
|
||||
else
|
||||
done.push_back(G);
|
||||
for (hash_set::const_iterator i = G->begin(); i != G->end(); ++i)
|
||||
state_set_map[*i] = num;
|
||||
|
||||
}
|
||||
else
|
||||
delete G;
|
||||
|
||||
if (!F->empty())
|
||||
{
|
||||
unsigned s = F->size();
|
||||
unsigned num = set_num;
|
||||
set_num++;
|
||||
used_var[num] = s;
|
||||
free_var.erase(num);
|
||||
if (s > 1)
|
||||
cur_run.push_back(F);
|
||||
else
|
||||
done.push_back(F);
|
||||
for (hash_set::const_iterator i = F->begin(); i != F->end(); ++i)
|
||||
state_set_map[*i] = num;
|
||||
}
|
||||
else
|
||||
delete F;
|
||||
|
||||
if (!G_F->empty())
|
||||
{
|
||||
unsigned s = G_F->size();
|
||||
unsigned num = set_num;
|
||||
set_num++;
|
||||
used_var[num] = s;
|
||||
free_var.erase(num);
|
||||
if (s > 1)
|
||||
cur_run.push_back(G_F);
|
||||
else
|
||||
done.push_back(G_F);
|
||||
for (hash_set::const_iterator i = G_F->begin(); i != G_F->end(); ++i)
|
||||
state_set_map[*i] = num;
|
||||
}
|
||||
else
|
||||
delete G_F;
|
||||
|
||||
if (!S->empty())
|
||||
{
|
||||
unsigned s = S->size();
|
||||
unsigned num = set_num;
|
||||
set_num++;
|
||||
used_var[num] = s;
|
||||
free_var.erase(num);
|
||||
if (s > 1)
|
||||
cur_run.push_back(S);
|
||||
else
|
||||
done.push_back(S);
|
||||
for (hash_set::const_iterator i = S->begin(); i != S->end(); ++i)
|
||||
state_set_map[*i] = num;
|
||||
}
|
||||
else
|
||||
delete S;
|
||||
|
||||
// A bdd_states_map is a list of formulae (in a BDD form) associated with a
|
||||
// destination set of states.
|
||||
typedef std::map<bdd, hash_set*, bdd_less_than> bdd_states_map;
|
||||
|
||||
bool did_split = true;
|
||||
unsigned num = set_num;
|
||||
set_num++;
|
||||
used_var[num] = 1;
|
||||
free_var.erase(num);
|
||||
bdd bdd_false_acceptance_condition = bdd_ithvar(num);
|
||||
|
||||
while (did_split)
|
||||
{
|
||||
did_split = false;
|
||||
while (!cur_run.empty())
|
||||
{
|
||||
// Get a set to process.
|
||||
hash_set* cur = cur_run.front();
|
||||
cur_run.pop_front();
|
||||
|
||||
trace
|
||||
<< "processing " << format_hash_set(cur, ta_) << std::endl;
|
||||
|
||||
hash_set::iterator hi;
|
||||
bdd_states_map bdd_map;
|
||||
for (hi = cur->begin(); hi != cur->end(); ++hi)
|
||||
{
|
||||
const state* src = *hi;
|
||||
bdd f = bddfalse;
|
||||
ta_succ_iterator* si = ta_->succ_iter(src);
|
||||
for (si->first(); !si->done(); si->next())
|
||||
{
|
||||
const state* dst = si->current_state();
|
||||
hash_map::const_iterator i = state_set_map.find(dst);
|
||||
|
||||
assert(i != state_set_map.end());
|
||||
bdd current_acceptance_conditions =
|
||||
si->current_acceptance_conditions();
|
||||
if (current_acceptance_conditions == bddfalse)
|
||||
current_acceptance_conditions
|
||||
= bdd_false_acceptance_condition;
|
||||
f |= (bdd_ithvar(i->second) & si->current_condition()
|
||||
& current_acceptance_conditions);
|
||||
trace << "--------------f: " << bdd_format_accset(ta_->get_dict(),f) << std::endl;;
|
||||
}
|
||||
delete si;
|
||||
|
||||
// Have we already seen this formula ?
|
||||
bdd_states_map::iterator bsi = bdd_map.find(f);
|
||||
if (bsi == bdd_map.end())
|
||||
{
|
||||
// No, create a new set.
|
||||
hash_set* new_set = new hash_set;
|
||||
new_set->insert(src);
|
||||
bdd_map[f] = new_set;
|
||||
}
|
||||
else
|
||||
{
|
||||
// Yes, add the current state to the set.
|
||||
bsi->second->insert(src);
|
||||
}
|
||||
}
|
||||
|
||||
bdd_states_map::iterator bsi = bdd_map.begin();
|
||||
if (bdd_map.size() == 1)
|
||||
{
|
||||
// The set was not split.
|
||||
trace
|
||||
<< "set " << format_hash_set(bsi->second, ta_)
|
||||
<< " was not split" << std::endl;
|
||||
next_run.push_back(bsi->second);
|
||||
}
|
||||
else
|
||||
{
|
||||
for (; bsi != bdd_map.end(); ++bsi)
|
||||
{
|
||||
hash_set* set = bsi->second;
|
||||
// Free the number associated to these states.
|
||||
unsigned num = state_set_map[*set->begin()];
|
||||
assert(used_var.find(num) != used_var.end());
|
||||
unsigned left = (used_var[num] -= set->size());
|
||||
// Make sure LEFT does not become negative (hence bigger
|
||||
// than SIZE when read as unsigned)
|
||||
assert(left < size);
|
||||
if (left == 0)
|
||||
{
|
||||
used_var.erase(num);
|
||||
free_var.insert(num);
|
||||
}
|
||||
// Pick a free number
|
||||
assert(!free_var.empty());
|
||||
num = *free_var.begin();
|
||||
free_var.erase(free_var.begin());
|
||||
used_var[num] = set->size();
|
||||
for (hash_set::iterator hit = set->begin(); hit
|
||||
!= set->end(); ++hit)
|
||||
state_set_map[*hit] = num;
|
||||
// Trivial sets can't be splitted any further.
|
||||
if (set->size() == 1)
|
||||
{
|
||||
trace
|
||||
<< "set " << format_hash_set(set, ta_)
|
||||
<< " is minimal" << std::endl;
|
||||
done.push_back(set);
|
||||
}
|
||||
else
|
||||
{
|
||||
did_split = true;
|
||||
trace
|
||||
<< "set " << format_hash_set(set, ta_)
|
||||
<< " should be processed further" << std::endl;
|
||||
next_run.push_back(set);
|
||||
}
|
||||
}
|
||||
}
|
||||
delete cur;
|
||||
}
|
||||
if (did_split)
|
||||
trace
|
||||
<< "splitting did occur during this pass." << std::endl;
|
||||
//elsetrace << "splitting did not occur during this pass." << std::endl;
|
||||
std::swap(cur_run, next_run);
|
||||
}
|
||||
|
||||
done.splice(done.end(), cur_run);
|
||||
|
||||
#ifdef TRACE
|
||||
trace << "Final partition: ";
|
||||
for (partition_t::const_iterator i = done.begin(); i != done.end(); ++i)
|
||||
trace << format_hash_set(*i, ta_) << " ";
|
||||
trace << std::endl;
|
||||
#endif
|
||||
|
||||
// Build the tgbault.
|
||||
ta* res = build_result(ta_, done);
|
||||
// Build the ta automata result.
|
||||
build_result(ta_, partition, tgba, res);
|
||||
|
||||
// Free all the allocated memory.
|
||||
std::list<hash_set*>::iterator itdone;
|
||||
for (itdone = done.begin(); itdone != done.end(); ++itdone)
|
||||
for (itdone = partition.begin(); itdone != partition.end(); ++itdone)
|
||||
delete *itdone;
|
||||
//delete ta_;
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
tgbta*
|
||||
minimize_tgbta(const tgbta* tgbta_)
|
||||
{
|
||||
|
||||
tgba_explicit_number* tgba = new tgba_explicit_number(tgbta_->get_dict());
|
||||
|
||||
tgbta_explicit* res = new tgbta_explicit(tgba, tgbta_->all_acceptance_conditions(),0);
|
||||
|
||||
const ta_explicit* tgbta = dynamic_cast <const tgbta_explicit*> (tgbta_);
|
||||
|
||||
partition_t partition = build_partition(tgbta);
|
||||
|
||||
|
||||
|
||||
// Build the tgbault.
|
||||
build_result(tgbta, partition,tgba, res);
|
||||
|
||||
// Free all the allocated memory.
|
||||
std::list<hash_set*>::iterator itdone;
|
||||
for (itdone = partition.begin(); itdone != partition.end(); ++itdone)
|
||||
delete *itdone;
|
||||
//delete ta_;
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue