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add simplification for equalities between itos and constant strings, Issue #589

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-07-08 11:50:39 -07:00
parent bdbf1c9bf4
commit d5ee7e24bc
4 changed files with 60 additions and 11 deletions
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5
src/ast/rewriter/seq_rewriter.h
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@ -125,15 +125,20 @@ class seq_rewriter {
expr_ref_vector& lhs, expr_ref_vector& rhs, bool& is_sat);
bool length_constrained(unsigned n, expr* const* l, unsigned m, expr* const* r,
expr_ref_vector& lhs, expr_ref_vector& rhs, bool& is_sat);
bool solve_itos(unsigned n, expr* const* l, unsigned m, expr* const* r,
expr_ref_vector& lhs, expr_ref_vector& rhs, bool& is_sat);
bool min_length(unsigned n, expr* const* es, unsigned& len);
expr* concat_non_empty(unsigned n, expr* const* es);
bool is_string(unsigned n, expr* const* es, zstring& s) const;
void add_next(u_map<expr*>& next, expr_ref_vector& trail, unsigned idx, expr* cond);
bool is_sequence(expr* e, expr_ref_vector& seq);
bool is_sequence(eautomaton& aut, expr_ref_vector& seq);
bool is_epsilon(expr* e) const;
void split_units(expr_ref_vector& lhs, expr_ref_vector& rhs);
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) {