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#5532

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Nikolaj Bjorner 2021-09-21 18:56:55 -07:00
parent de20bffafe
commit cabd5b10fa
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20
src/sat/smt/euf_internalize.cpp
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@ -13,6 +13,20 @@ Author:
Nikolaj Bjorner (nbjorner) 2020-08-25
Notes:
(*) From smt_internalizer.cpp
This code is necessary because some theories may decide
not to create theory variables for a nested application.
Example:
Suppose (+ (* 2 x) y) is internalized by arithmetic
and an enode is created for the + and * applications,
but a theory variable is only created for the + application.
The (* 2 x) is internal to the arithmetic module.
Later, the core tries to internalize (f (* 2 x)).
Now, (* 2 x) is not internal to arithmetic anymore,
and a theory variable must be created for it.
--*/
#include "ast/pb_decl_plugin.h"
@ -72,6 +86,12 @@ namespace euf {
bool solver::visit(expr* e) {
euf::enode* n = m_egraph.find(e);
th_solver* s = nullptr;
if (n && !si.is_bool_op(e) && (s = expr2solver(e), s && euf::null_theory_var == n->get_th_var(s->get_id()))) {
// ensure that theory variables are attached in shared contexts. See notes (*)
s->internalize(e, false);
return true;
}
if (n)
return true;
if (si.is_bool_op(e)) {