expr::term_ref transition_system::get_initial_states() const {
expr::term_ref I = d_initial_states->get_formula();
if (has_assumptions()) {
I = d_state_type->tm().mk_term(expr::TERM_AND, I, get_assumption());
}
return I;
}
expr::term_ref transition_system::get_transition_relation() const {
std::vector<expr::term_ref> transitions;
transitions.push_back(d_transition_relation->get_formula());
expr::term_ref transition = d_state_type->tm().mk_or(transitions);
if (has_assumptions()) {
expr::term_ref A = get_assumption();
expr::term_ref A_next = d_state_type->change_formula_vars(state_type::STATE_CURRENT, state_type::STATE_NEXT, A);
transition = d_state_type->tm().mk_term(expr::TERM_AND, transition, A, A_next);
}
return transition;
}
static foreign_t pl_clingo_solve(term_t ccontrol, term_t assumptions,
term_t Show, term_t Model, control_t h) {
int rc = TRUE;
solve_state *state = NULL;
clingo_symbolic_literal_t *assump_vec = NULL;
int control = PL_foreign_control(h);
if (control == PL_FIRST_CALL) {
size_t alen = 0;
if (!(state = malloc(sizeof(*state)))) {
rc = PL_resource_error("memory");
goto out;
}
memset(state, 0, sizeof(*state));
if (!(rc = get_clingo(ccontrol, &state->ctl))) {
goto out;
}
if (PL_skip_list(assumptions, 0, &alen) != PL_LIST) {
rc = PL_type_error("list", assumptions);
goto out;
}
term_t tail = PL_copy_term_ref(assumptions);
term_t head = PL_new_term_ref();
if (!(assump_vec = malloc(sizeof(*assump_vec) * alen))) {
rc = PL_resource_error("memory");
goto out;
}
memset(assump_vec, 0, sizeof(*assump_vec) * alen);
for (size_t i = 0; PL_get_list(tail, head, tail); i++) {
if (!(rc = clingo_status(get_assumption(head, &assump_vec[i])))) {
goto out;
}
}
if (!(rc = clingo_status(clingo_control_solve_iteratively(
state->ctl->control, assump_vec, alen, &state->it)))) {
goto out;
}
} else {
state = PL_foreign_context_address(h);
}
while (control != PL_PRUNED) {
clingo_model_t *model;
if (!(rc = clingo_status(
clingo_solve_iteratively_next(state->it, &model)))) {
goto out;
}
if (model) {
int show;
if (!(rc = get_show_map(Show, &show))) {
goto out;
}
if (!(rc = unify_model(Model, show, model))) {
if (PL_exception(0)) {
goto out;
}
} else {
PL_retry_address(state);
state = NULL;
break;
}
} else {
rc = FALSE;
break;
}
}
out:
if (assump_vec) {
free(assump_vec);
}
if (state) {
if (state->it) {
clingo_solve_iteratively_close(state->it);
}
free(state);
}
return rc;
}