mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-10-08 17:01:55 +00:00
Code Activity

introduce notion of beta redex to deal with lambdas in non-extensional positions

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-06-10 17:35:01 -07:00
parent b9b5377c69
commit 8efa3c8ade
10 changed files with 65 additions and 51 deletions
Download patch file Download diff file Expand all files Collapse all files

26
src/smt/theory_seq.cpp
View file

@ -1457,8 +1457,6 @@ bool theory_seq::internalize_term(app* term) {
return true;
}
suppress_lambda(term);
if (m.is_bool(term) &&
(m_util.str.is_in_re(term) || m_sk.is_skolem(term))) {
bool_var bv = ctx.mk_bool_var(term);
@ -1486,26 +1484,18 @@ bool theory_seq::internalize_term(app* term) {
mk_var(e);
if (!ctx.relevancy()) {
relevant_eh(term);
}
}
return true;
}
void theory_seq::suppress_lambda(app* term) {
bool theory_seq::is_beta_redex(enode* p, enode* n) const {
expr* term = p->get_expr();
if (!m_util.str.is_map(term) && !m_util.str.is_mapi(term) &&
!m_util.str.is_foldl(term) && !m_util.str.is_foldli(term))
return;
expr* fn = to_app(term)->get_arg(0);
quantifier* q = nullptr;
if (is_lambda(fn))
q = to_quantifier(fn);
else if (is_app(fn))
q = m.is_lambda_def(to_app(fn)->get_decl());
if (q)
ctx.add_non_lambda(q);
return false;
if (p->get_arg(0)->get_root() == n->get_root())
return true;
return false;
}
@ -3292,7 +3282,7 @@ bool theory_seq::should_research(expr_ref_vector & unsat_core) {
k_min *= 2;
if (m_util.is_seq(s_min))
k_min = std::max(m_util.str.min_length(s_min), k_min);
IF_VERBOSE(1, verbose_stream() << "(smt.seq :increase-length " << mk_pp(s_min, m) << " " << k_min << ")\n");
IF_VERBOSE(1, verbose_stream() << "(smt.seq :increase-length " << mk_bounded_pp(s_min, m, 3) << " " << k_min << ")\n");
add_length_limit(s_min, k_min, false);
return true;
}