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enforce reference count ownership in context of mk_derivative calls.

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-07-01 13:13:17 -07:00
parent d75ce38016
commit d91ca423ab
2 changed files with 12 additions and 9 deletions
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12
src/ast/rewriter/seq_rewriter.cpp
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@ -2545,7 +2545,8 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
if (lo > 0) {
lo--;
}
return mk_der_concat(mk_derivative(ele, r1), re().mk_loop(r1, lo));
result = re().mk_loop(r1, lo);
return mk_der_concat(mk_derivative(ele, r1), result);
}
else if (re().is_loop(r, r1, lo, hi)) {
if (hi == 0) {
@ -2555,7 +2556,8 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
if (lo > 0) {
lo--;
}
return mk_der_concat(mk_derivative(ele, r1), re().mk_loop(r1, lo, hi));
result = re().mk_loop(r1, lo, hi);
return mk_der_concat(mk_derivative(ele, r1), result);
}
else if (re().is_full_seq(r) ||
re().is_empty(r)) {
@ -2566,7 +2568,8 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
expr_ref hd(m()), tl(m());
if (get_head_tail(r1, hd, tl)) {
// head must be equal; if so, derivative is tail
return re_and(m_br.mk_eq_rw(ele, hd), re().mk_to_re(tl));
result = re().mk_to_re(tl);
return re_and(m_br.mk_eq_rw(ele, hd), result);
}
else if (str().is_empty(r1)) {
return mk_empty();
@ -2575,10 +2578,11 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
#if 0
hd = str().mk_nth_i(r1, m_autil.mk_int(0));
tl = str().mk_substr(r1, m_autil.mk_int(1), m_autil.mk_sub(str().mk_length(r1), m_autil.mk_int(1)));
result = re().mk_to_re(tl);
result =
m().mk_ite(m_br.mk_eq_rw(r1, str().mk_empty(m().get_sort(r1))),
mk_empty(),
re_and(m_br.mk_eq_rw(ele, hd), re().mk_to_re(tl)));
re_and(m_br.mk_eq_rw(ele, hd), result));
return result;
#else
return expr_ref(re().mk_derivative(ele, r), m());