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patch seq theory using purification to avoid unsoundness caused by interaction with canonization and rewriting

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-02-14 17:40:41 -08:00
parent 2db2767e7a
commit 70b4822571
6 changed files with 45 additions and 42 deletions
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8
src/ast/rewriter/seq_rewriter.cpp
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@ -4514,6 +4514,14 @@ bool seq_rewriter::is_string(unsigned n, expr* const* es, zstring& s) const {
return true;
}
expr_ref seq_rewriter::mk_length(expr* s) {
expr_ref result(m());
if (BR_FAILED == mk_seq_length(s, result))
result = str().mk_length(s);
return result;
}
/**
* itos(n) = <numeric string> -> n = numeric
*/

4
src/ast/rewriter/seq_rewriter.h
View file

@ -280,7 +280,7 @@ class seq_rewriter {
bool reduce_subsequence(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_pair_vector& eqs);
bool reduce_by_length(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_pair_vector& eqs);
bool reduce_itos(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_pair_vector& eqs);
bool reduce_eq_empty(expr* l, expr* r, expr_ref& result);
bool reduce_eq_empty(expr* l, expr* r, expr_ref& result);
bool min_length(expr_ref_vector const& es, unsigned& len);
expr* concat_non_empty(expr_ref_vector& es);
@ -344,6 +344,8 @@ public:
bool reduce_contains(expr* a, expr* b, expr_ref_vector& disj);
expr_ref mk_length(expr* s);
void add_seqs(expr_ref_vector const& ls, expr_ref_vector const& rs, expr_ref_pair_vector& new_eqs);
// Expose derivative and nullability check