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add recfun rewriting, remove quantifier based recfun

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This commit is contained in:
Nikolaj Bjorner 2020-04-26 12:59:51 -07:00
parent 7f1b147cba
commit f9193809ea
13 changed files with 94 additions and 143 deletions
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26
src/smt/smt_context.cpp
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@ -4507,32 +4507,6 @@ namespace smt {
void context::add_rec_funs_to_model() {
if (!m_model) return;
for (unsigned i = 0; !get_cancel_flag() && i < m_asserted_formulas.get_num_formulas(); ++i) {
expr* e = m_asserted_formulas.get_formula(i);
if (is_quantifier(e)) {
quantifier* q = to_quantifier(e);
if (!m.is_rec_fun_def(q)) continue;
TRACE("context", tout << mk_pp(e, m) << "\n";);
SASSERT(q->get_num_patterns() == 2);
expr* fn = to_app(q->get_pattern(0))->get_arg(0);
expr* body = to_app(q->get_pattern(1))->get_arg(0);
SASSERT(is_app(fn));
// reverse argument order so that variable 0 starts at the beginning.
expr_ref_vector subst(m);
unsigned idx = 0;
for (expr* arg : *to_app(fn)) {
subst.push_back(m.mk_var(idx++, m.get_sort(arg)));
}
expr_ref bodyr(m);
var_subst sub(m, true);
TRACE("context", tout << expr_ref(q, m) << " " << subst << "\n";);
bodyr = sub(body, subst.size(), subst.c_ptr());
func_decl* f = to_app(fn)->get_decl();
func_interp* fi = alloc(func_interp, m, f->get_arity());
fi->set_else(bodyr);
m_model->register_decl(f, fi);
}
}
recfun::util u(m);
func_decl_ref_vector recfuns = u.get_rec_funs();
for (func_decl* f : recfuns) {