mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-07-18 02:16:40 +00:00
Code Activity

add general purpose emptiness/non-emptiness check

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-26 20:42:21 -07:00
parent 33cdc06eb4
commit 88e36c6bf3
8 changed files with 298 additions and 65 deletions
Download patch file Download diff file Expand all files Collapse all files

21
src/ast/rewriter/seq_rewriter.h
View file

@ -214,6 +214,9 @@ class seq_rewriter {
class seq_util::str& str() { return u().str; }
class seq_util::str const& str() const { return u().str; }
void get_cofactors(expr* r, expr_ref_vector& conds, expr_ref_pair_vector& result);
void intersect(unsigned lo, unsigned hi, svector<std::pair<unsigned, unsigned>>& ranges);
public:
seq_rewriter(ast_manager & m, params_ref const & p = params_ref()):
m_util(m), m_autil(m), m_re2aut(m), m_es(m), m_lhs(m), m_rhs(m), m_coalesce_chars(true) {
@ -235,6 +238,15 @@ public:
br_status mk_eq_core(expr * lhs, expr * rhs, expr_ref & result);
br_status mk_bool_app(func_decl* f, unsigned n, expr* const* args, expr_ref& result);
expr_ref mk_app(func_decl* f, expr_ref_vector const& args) { return mk_app(f, args.size(), args.c_ptr()); }
expr_ref mk_app(func_decl* f, unsigned n, expr* const* args) {
expr_ref result(m());
if (f->get_family_id() != u().get_family_id() ||
BR_FAILED == mk_app_core(f, n, args, result))
result = m().mk_app(f, n, args);
return result;
}
bool reduce_eq(expr* l, expr* r, expr_ref_pair_vector& new_eqs, bool& change);
bool reduce_eq(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_pair_vector& new_eqs, bool& change);
@ -249,6 +261,15 @@ public:
bool has_cofactor(expr* r, expr_ref& cond, expr_ref& th, expr_ref& el);
void get_cofactors(expr* r, expr_ref_pair_vector& result) {
expr_ref_vector conds(m());
get_cofactors(r, conds, result);
}
// heuristic elimination of element from condition that comes form a derivative.
// special case optimization for conjunctions of equalities, disequalities and ranges.
void elim_condition(expr* elem, expr_ref& cond);
};
#endif