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fix #3913 - change assumption tracking to be granular based on disabled guards

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-13 19:06:12 -07:00
parent e1027790ae
commit fe7146d93b
6 changed files with 102 additions and 73 deletions
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9
src/smt/theory_recfun.h
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@ -95,15 +95,20 @@ namespace smt {
stats m_stats;
// book-keeping for depth of predicates
expr_ref_vector m_disabled_guards;
expr_ref_vector m_enabled_guards;
obj_map<expr, unsigned> m_pred_depth;
expr_ref_vector m_preds;
unsigned_vector m_preds_lim;
unsigned m_max_depth; // for fairness and termination
unsigned m_num_rounds;
ptr_vector<case_expansion> m_q_case_expand;
ptr_vector<body_expansion> m_q_body_expand;
vector<literal_vector> m_q_clauses;
bool is_enabled_guard(expr* guard) { expr_ref ng(m.mk_not(guard), m); return m_enabled_guards.contains(ng); }
bool is_disabled_guard(expr* guard) { return m_disabled_guards.contains(guard); }
recfun::util & u() const { return m_util; }
bool is_defined(app * f) const { return u().is_defined(f); }
bool is_case_pred(app * f) const { return u().is_case_pred(f); }
@ -118,7 +123,7 @@ namespace smt {
void assert_body_axiom(body_expansion & e);
literal mk_literal(expr* e);
void assert_max_depth_limit(expr* guard);
void disable_guard(expr* guard);
unsigned get_depth(expr* e);
void set_depth(unsigned d, expr* e);
void set_depth_rec(unsigned d, expr* e);