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fix unsoundness in explanation handling for nested datatypes and sequences

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This commit is contained in:
Nikolaj Bjorner 2022-07-03 16:57:49 -07:00
parent e6e0c74324
commit 1e8f9078e3
4 changed files with 54 additions and 30 deletions
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16
src/ast/seq_decl_plugin.cpp
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@ -971,6 +971,22 @@ bool seq_util::str::is_len_sub(expr const* s, expr*& l, expr*& u, rational& k) c
return false;
}
bool seq_util::str::is_concat_of_units(expr* s) const {
ptr_vector<expr> todo;
todo.push_back(s);
while (!todo.empty()) {
expr* e = todo.back();
todo.pop_back();
if (is_empty(e) || is_unit(e))
continue;
if (is_concat(e))
todo.append(to_app(e)->get_num_args(), to_app(e)->get_args());
else
return false;
}
return true;
}
bool seq_util::str::is_unit_string(expr const* s, expr_ref& c) const {
zstring z;
expr* ch = nullptr;