From 28bce8f09ccdd194c8ebcab1a128edc0e8e2d721 Mon Sep 17 00:00:00 2001
From: Nikolaj Bjorner <nbjorner@microsoft.com>
Date: Tue, 28 Dec 2021 11:00:02 -0800
Subject: [PATCH] working on relevant

---
 src/ast/euf/euf_egraph.cpp    |  4 +-
 src/ast/euf/euf_egraph.h      |  5 ++-
 src/sat/smt/euf_relevancy.cpp | 73 ++++++++++++++++-------------------
 src/sat/smt/euf_solver.cpp    | 53 ++++++++++++-------------
 src/sat/smt/euf_solver.h      |  8 ++--
 src/sat/smt/q_ematch.cpp      | 12 +++++-
 src/sat/smt/q_ematch.h        |  3 +-
 src/sat/smt/q_solver.h        |  1 +
 src/sat/smt/sat_th.h          |  2 +
 src/sat/smt/smt_relevant.cpp  | 43 ++++++++++++---------
 src/sat/smt/smt_relevant.h    | 15 ++++---
 11 files changed, 121 insertions(+), 98 deletions(-)

diff --git a/src/ast/euf/euf_egraph.cpp b/src/ast/euf/euf_egraph.cpp
index 1f8e14565..f1e51ee1d 100644
--- a/src/ast/euf/euf_egraph.cpp
+++ b/src/ast/euf/euf_egraph.cpp
@@ -446,8 +446,8 @@ namespace euf {
         r2->inc_class_size(r1->class_size());   
         merge_th_eq(r1, r2);
         reinsert_parents(r1, r2);
-        if (m_on_merge)
-            m_on_merge(r2, r1);
+        for (auto& cb : m_on_merge)
+            cb(r2, r1);
     }
 
     void egraph::remove_parents(enode* r1, enode* r2) {
diff --git a/src/ast/euf/euf_egraph.h b/src/ast/euf/euf_egraph.h
index 7c1f9e566..ef70fafd5 100644
--- a/src/ast/euf/euf_egraph.h
+++ b/src/ast/euf/euf_egraph.h
@@ -32,6 +32,7 @@ Notes:
 #include "ast/euf/euf_enode.h"
 #include "ast/euf/euf_etable.h"
 #include "ast/ast_ll_pp.h"
+#include <vector>
 
 namespace euf {
 
@@ -181,7 +182,7 @@ namespace euf {
         enode_vector           m_todo;
         stats                  m_stats;
         bool                   m_uses_congruence = false;
-        std::function<void(enode*,enode*)>     m_on_merge;
+        std::vector<std::function<void(enode*,enode*)>>     m_on_merge;
         std::function<void(enode*)>            m_on_make;
         std::function<void(expr*,expr*,expr*)> m_used_eq;
         std::function<void(app*,app*)>         m_used_cc;  
@@ -293,7 +294,7 @@ namespace euf {
         void set_value(enode* n, lbool value);
         void set_bool_var(enode* n, unsigned v) { n->set_bool_var(v); }
 
-        void set_on_merge(std::function<void(enode* root,enode* other)>& on_merge) { m_on_merge = on_merge; }
+        void set_on_merge(std::function<void(enode* root,enode* other)>& on_merge) { m_on_merge.push_back(on_merge); }
         void set_on_make(std::function<void(enode* n)>& on_make) { m_on_make = on_make; }
         void set_used_eq(std::function<void(expr*,expr*,expr*)>& used_eq) { m_used_eq = used_eq; }
         void set_used_cc(std::function<void(app*,app*)>& used_cc) { m_used_cc = used_cc; }
diff --git a/src/sat/smt/euf_relevancy.cpp b/src/sat/smt/euf_relevancy.cpp
index 64aea0c8c..a15e7bacc 100644
--- a/src/sat/smt/euf_relevancy.cpp
+++ b/src/sat/smt/euf_relevancy.cpp
@@ -23,10 +23,10 @@ Author:
 namespace euf {
 
     void solver::add_auto_relevant(sat::literal lit) {
-#if NEW_RELEVANCY
-        m_relevancy.mark_relevant(lit);
-        return;
-#endif
+        if (m_relevancy.enabled()) {
+            m_relevancy.mark_relevant(lit);
+            return;
+        }
         if (!relevancy_enabled())
             return;
         for (; m_auto_relevant_scopes > 0; --m_auto_relevant_scopes) 
@@ -37,10 +37,10 @@ namespace euf {
     }
     
     void solver::pop_relevant(unsigned n) {
-#if NEW_RELEVANCY
-        m_relevancy.pop(n);
-        return;
-#endif
+        if (m_relevancy.enabled()) {
+            m_relevancy.pop(n);
+            return;
+        }
         if (m_auto_relevant_scopes >= n) {
             m_auto_relevant_scopes -= n;
             return;
@@ -54,31 +54,28 @@ namespace euf {
     }
     
     void solver::push_relevant() {
-#if NEW_RELEVANCY
-        m_relevancy.push();
-        return;
-#endif
+        if (m_relevancy.enabled()) {
+            m_relevancy.push();
+            return;
+        }
         ++m_auto_relevant_scopes;
     }
 
     bool solver::is_relevant(expr* e) const { 
-#if NEW_RELEVANCY
-        return m_relevancy.is_relevant(e);
-#endif
+        if (m_relevancy.enabled())
+            return m_relevancy.is_relevant(e);
         return m_relevant_expr_ids.get(e->get_id(), true); 
     }
 
     bool solver::is_relevant(enode* n) const { 
-#if NEW_RELEVANCY
-        return m_relevancy.is_relevant(n);
-#endif
+        if (m_relevancy.enabled())
+            return m_relevancy.is_relevant(n);
         return m_relevant_expr_ids.get(n->get_expr_id(), true); 
     }
 
     void solver::ensure_dual_solver() {
-#if NEW_RELEVANCY
-        return;
-#endif
+        if (m_relevancy.enabled())
+            return;
         if (m_dual_solver)
             return;
         m_dual_solver = alloc(sat::dual_solver, s(), s().rlimit());
@@ -93,10 +90,10 @@ namespace euf {
      * not tracked.
      */
     void solver::add_root(unsigned n, sat::literal const* lits) {
-#if NEW_RELEVANCY
-        m_relevancy.add_root(n, lits);
-        return;
-#endif
+        if (m_relevancy.enabled()) {
+            m_relevancy.add_root(n, lits);
+            return;
+        }
         if (!relevancy_enabled())
             return;
         ensure_dual_solver();
@@ -104,10 +101,10 @@ namespace euf {
     }
 
     void solver::add_aux(unsigned n, sat::literal const* lits) {
-#if NEW_RELEVANCY
-        m_relevancy.add_def(n, lits);
-        return;
-#endif
+        if (m_relevancy.enabled()) {
+            m_relevancy.add_def(n, lits);
+            return;
+        }
         if (!relevancy_enabled())
             return;
         ensure_dual_solver();
@@ -115,17 +112,15 @@ namespace euf {
     }
 
     void solver::track_relevancy(sat::bool_var v) {
-#if NEW_RELEVANCY
-        return;
-#endif
+        if (m_relevancy.enabled())
+            return;
         ensure_dual_solver();
         m_dual_solver->track_relevancy(v);
     }
 
     bool solver::init_relevancy() {
-#if NEW_RELEVANCY
-        return true;
-#endif
+        if (m_relevancy.enabled())
+            return true;
         m_relevant_expr_ids.reset();
         if (!relevancy_enabled())
             return true;
@@ -144,19 +139,19 @@ namespace euf {
     }
 
     void solver::push_relevant(sat::bool_var v) {
-        SASSERT(!NEW_RELEVANCY);
+        SASSERT(!m_relevancy.enabled());
         expr* e = m_bool_var2expr.get(v, nullptr);
         if (e)
             m_relevant_todo.push_back(e);
     }
 
     bool solver::is_propagated(sat::literal lit) {
-        SASSERT(!NEW_RELEVANCY);
+        SASSERT(!m_relevancy.enabled());        
         return s().value(lit) == l_true && !s().get_justification(lit.var()).is_none();
     }
 
     void solver::init_relevant_expr_ids() {
-        SASSERT(!NEW_RELEVANCY);
+        SASSERT(!m_relevancy.enabled());
         unsigned max_id = 0;
         for (enode* n : m_egraph.nodes())
             max_id = std::max(max_id, n->get_expr_id());
@@ -166,7 +161,7 @@ namespace euf {
     }
 
     void solver::relevant_subterms() {
-        SASSERT(!NEW_RELEVANCY);
+        SASSERT(!m_relevancy.enabled());
         ptr_vector<expr>& todo = m_relevant_todo;
         bool_vector& visited = m_relevant_visited;
         for (unsigned i = 0; i < todo.size(); ++i) {
diff --git a/src/sat/smt/euf_solver.cpp b/src/sat/smt/euf_solver.cpp
index 2c602d205..ca931ce8f 100644
--- a/src/sat/smt/euf_solver.cpp
+++ b/src/sat/smt/euf_solver.cpp
@@ -58,6 +58,14 @@ namespace euf {
             display_justification_ptr(out, reinterpret_cast<size_t*>(j)); 
         };
         m_egraph.set_display_justification(disp);
+
+        if (m_relevancy.enabled()) {
+            std::function<void(euf::enode* root, euf::enode* other)> on_merge =
+                [&](enode* root, enode* other) {
+                m_relevancy.merge(root, other);
+            };
+            m_egraph.set_on_merge(on_merge);
+        }
     }
 
     void solver::updt_params(params_ref const& p) {
@@ -244,17 +252,10 @@ namespace euf {
     bool solver::propagate(enode* a, enode* b, ext_justification_idx idx) {
         if (a->get_root() == b->get_root())
             return false;
-        merge(a, b, to_ptr(idx));
+        m_egraph.merge(a, b, to_ptr(idx));
         return true;
     }
 
-    void solver::merge(enode* a, enode* b, void* r) {
-#if NEW_RELEVANCY
-        m_relevancy.merge(a, b);
-#endif
-        m_egraph.merge(a, b, r);
-    }
-
     void solver::get_antecedents(literal l, constraint& j, literal_vector& r, bool probing) {
         expr* e = nullptr;
         euf::enode* n = nullptr;
@@ -294,12 +295,11 @@ namespace euf {
     }
 
     void solver::asserted(literal l) {
-#if NEW_RELEVANCY
-        if (!m_relevancy.is_relevant(l)) {
+        if (m_relevancy.enabled() && !m_relevancy.is_relevant(l)) {
             m_relevancy.asserted(l);
             return;
         }
-#endif
+
         expr* e = m_bool_var2expr.get(l.var(), nullptr);
         TRACE("euf", tout << "asserted: " << l << "@" << s().scope_lvl() << " := " << mk_bounded_pp(e, m) << "\n";);
         if (!e) 
@@ -320,14 +320,14 @@ namespace euf {
             euf::enode* r = n->get_root();
             euf::enode* rb = sign ? mk_true() : mk_false();
             sat::literal rl(r->bool_var(), r->value() == l_false);
-            merge(n, nb, c);
-            merge(r, rb, to_ptr(rl));
+            m_egraph.merge(n, nb, c);
+            m_egraph.merge(r, rb, to_ptr(rl));
             SASSERT(m_egraph.inconsistent());
             return;
 	    }
         if (n->merge_tf()) {
             euf::enode* nb = sign ? mk_false() : mk_true();
-            merge(n, nb, c);
+            m_egraph.merge(n, nb, c);
         }
         if (n->is_equality()) {
             SASSERT(!m.is_iff(e));
@@ -335,7 +335,7 @@ namespace euf {
             if (sign)
                 m_egraph.new_diseq(n);
             else                 
-                merge(n->get_arg(0), n->get_arg(1), c);            
+                m_egraph.merge(n->get_arg(0), n->get_arg(1), c);            
         }    
     }
 
@@ -343,9 +343,8 @@ namespace euf {
     bool solver::unit_propagate() {
         bool propagated = false;
         while (!s().inconsistent()) {
-#if NEW_RELEVANCY
-            m_relevancy.propagate();
-#endif
+            if (m_relevancy.enabled())
+                m_relevancy.propagate();
             if (m_egraph.inconsistent()) {  
                 unsigned lvl = s().scope_lvl();
                 s().set_conflict(sat::justification::mk_ext_justification(lvl, conflict_constraint().to_index()));
@@ -362,9 +361,13 @@ namespace euf {
                 if (m_solvers[i]->unit_propagate())
                     propagated1 = true;
             
-            if (!propagated1)
-                break;
-            propagated = true;             
+            if (propagated1) {
+                propagated = true;
+                continue;
+            }
+            if (m_relevancy.enabled() && m_relevancy.can_propagate())
+                continue;
+            break;                  
         }
         DEBUG_CODE(if (!propagated && !s().inconsistent()) check_missing_eq_propagation(););
         return propagated;
@@ -439,12 +442,10 @@ namespace euf {
     void solver::propagate_th_eqs() {
         for (; m_egraph.has_th_eq() && !s().inconsistent() && !m_egraph.inconsistent(); m_egraph.next_th_eq()) {
             th_eq eq = m_egraph.get_th_eq();
-            if (eq.is_eq()) {
-                if (!is_self_propagated(eq))
-                    m_id2solver[eq.id()]->new_eq_eh(eq);    
-            }
-            else
+            if (!eq.is_eq())
                 m_id2solver[eq.id()]->new_diseq_eh(eq);
+            else if (!is_self_propagated(eq))
+                m_id2solver[eq.id()]->new_eq_eh(eq);                                
         }
     }
 
diff --git a/src/sat/smt/euf_solver.h b/src/sat/smt/euf_solver.h
index 1396e00fb..2145594f1 100644
--- a/src/sat/smt/euf_solver.h
+++ b/src/sat/smt/euf_solver.h
@@ -31,7 +31,6 @@ Author:
 #include "sat/smt/smt_relevant.h"
 #include "smt/params/smt_params.h"
 
-#define NEW_RELEVANCY 0
 
 namespace euf {
     typedef sat::literal literal;
@@ -257,6 +256,10 @@ namespace euf {
         sat::sat_internalizer& get_si() { return si; }
         ast_manager& get_manager() { return m; }
         enode* get_enode(expr* e) const { return m_egraph.find(e); }
+        enode* bool_var2enode(sat::bool_var b) const {
+            expr* e = m_bool_var2expr.get(b);
+            return e ? get_enode(e) : nullptr;
+        }
         sat::literal expr2literal(expr* e) const { return enode2literal(get_enode(e)); }
         sat::literal enode2literal(enode* n) const { return sat::literal(n->bool_var(), false); }
         lbool value(enode* n) const { return s().value(enode2literal(n)); }
@@ -293,7 +296,6 @@ namespace euf {
 
         void propagate(literal lit, ext_justification_idx idx);
         bool propagate(enode* a, enode* b, ext_justification_idx idx);
-        void merge(enode* a, enode* b, void* r);
         void set_conflict(ext_justification_idx idx);
 
         void propagate(literal lit, th_explain* p) { propagate(lit, p->to_index()); }
@@ -395,7 +397,7 @@ namespace euf {
         void add_auto_relevant(sat::literal lit);
         void pop_relevant(unsigned n);
         void push_relevant();
-
+        smt::relevancy& relevancy() { return m_relevancy; }
 
         // model construction
         void update_model(model_ref& mdl);
diff --git a/src/sat/smt/q_ematch.cpp b/src/sat/smt/q_ematch.cpp
index e4e01b964..a5f64f677 100644
--- a/src/sat/smt/q_ematch.cpp
+++ b/src/sat/smt/q_ematch.cpp
@@ -66,13 +66,21 @@ namespace q {
         };
         std::function<void(euf::enode*)> _on_make = 
             [&](euf::enode* n) {
-            m_mam->add_node(n, false);
+            relevant_eh(n);
+
         };
         ctx.get_egraph().set_on_merge(_on_merge);
-        ctx.get_egraph().set_on_make(_on_make);
+        if (ctx.relevancy().enabled())
+            ctx.get_egraph().set_on_make(_on_make);
+        else
+            ctx.relevancy().add_relevant(&s);
         m_mam = mam::mk(ctx, *this);
     }
 
+    void ematch::relevant_eh(euf::enode* n) {
+        m_mam->add_node(n, false);
+    }
+
     void ematch::ensure_ground_enodes(expr* e) {
         mam::ground_subterms(e, m_ground);
         for (expr* g : m_ground) 
diff --git a/src/sat/smt/q_ematch.h b/src/sat/smt/q_ematch.h
index 3cdcfc80e..0db541c1c 100644
--- a/src/sat/smt/q_ematch.h
+++ b/src/sat/smt/q_ematch.h
@@ -135,9 +135,10 @@ namespace q {
 
         bool unit_propagate();        
 
-
         void add(quantifier* q);
 
+        void relevant_eh(euf::enode* n);
+
         void collect_statistics(statistics& st) const;
 
         void get_antecedents(sat::literal l, sat::ext_justification_idx idx, sat::literal_vector& r, bool probing);
diff --git a/src/sat/smt/q_solver.h b/src/sat/smt/q_solver.h
index 934864669..5d6a52c8f 100644
--- a/src/sat/smt/q_solver.h
+++ b/src/sat/smt/q_solver.h
@@ -83,6 +83,7 @@ namespace q {
         void init_search() override;
         void finalize_model(model& mdl) override;
         bool is_shared(euf::theory_var v) const override { return true; }
+        void relevant_eh(euf::enode* n) override { m_ematch.relevant_eh(n); }
 
         ast_manager& get_manager() { return m; }
         sat::literal_vector const& universal() const { return m_universal; }
diff --git a/src/sat/smt/sat_th.h b/src/sat/smt/sat_th.h
index 7e66a7156..fecb745c5 100644
--- a/src/sat/smt/sat_th.h
+++ b/src/sat/smt/sat_th.h
@@ -111,6 +111,8 @@ namespace euf {
 
         virtual void new_diseq_eh(euf::th_eq const& eq) {}
 
+        virtual void relevant_eh(euf::enode* n) {}
+
         /**
            \brief Parametric theories (e.g. Arrays) should implement this method.
         */
diff --git a/src/sat/smt/smt_relevant.cpp b/src/sat/smt/smt_relevant.cpp
index d70d37beb..9d118001c 100644
--- a/src/sat/smt/smt_relevant.cpp
+++ b/src/sat/smt/smt_relevant.cpp
@@ -3,7 +3,7 @@ Copyright (c) 2020 Microsoft Corporation
 
 Module Name:
 
-    relevancy.cpp
+    smt_relevant.cpp
 
 Abstract:
 
@@ -22,11 +22,13 @@ Author:
 namespace smt {
 
     relevancy::relevancy(euf::solver& ctx): ctx(ctx) {
-        m_enabled = ctx.relevancy_enabled();
+        m_enabled = ctx.get_config().m_relevancy_lvl > 2;
     }
 
     void relevancy::relevant_eh(euf::enode* n) {
-        // nothing
+        SASSERT(is_relevant(n));
+        for (auto* th : m_relevant_eh)
+            th->relevant_eh(n);
     }
 
     void relevancy::relevant_eh(sat::literal lit) {
@@ -102,8 +104,10 @@ namespace smt {
         m_clauses.push_back(cl);
         m_roots.push_back(true);
         m_trail.push_back(std::make_pair(update::add_clause, 0));
-        for (sat::literal lit : *cl) 
+        for (sat::literal lit : *cl) {
+            ctx.s().set_external(lit.var());
             occurs(lit).push_back(sz);
+        }
     }
     
     void relevancy::add_def(unsigned n, sat::literal const* lits) {
@@ -121,15 +125,17 @@ namespace smt {
         m_clauses.push_back(cl);
         m_roots.push_back(false);
         m_trail.push_back(std::make_pair(update::add_clause, 0));
-        for (sat::literal lit : *cl) 
-            occurs(lit).push_back(sz);        
+        for (sat::literal lit : *cl) {
+            ctx.s().set_external(lit.var());
+            occurs(lit).push_back(sz);
+        }
     }
 
     void relevancy::asserted(sat::literal lit) {
         if (!m_enabled)
             return;
         flush();
-        if (ctx.s().lvl(lit) == 0) {
+        if (ctx.s().lvl(lit) <= ctx.s().search_lvl()) {
             mark_relevant(lit);
             return;
         }
@@ -164,11 +170,11 @@ namespace smt {
         }
     }
 
-    void relevancy::merge(euf::enode* n1, euf::enode* n2) {
-        if (is_relevant(n1))
-            mark_relevant(n2);
-        else if (is_relevant(n2))
-            mark_relevant(n1);
+    void relevancy::merge(euf::enode* root, euf::enode* other) {
+        if (is_relevant(root))
+            mark_relevant(other);
+        else if (is_relevant(other))
+            mark_relevant(root);
     }
     
     void relevancy::mark_relevant(euf::enode* n) {
@@ -177,6 +183,8 @@ namespace smt {
         flush();
         if (is_relevant(n))
             return;
+        if (ctx.get_si().is_bool_op(n->get_expr()))
+            return; 
         for (euf::enode* sib : euf::enode_class(n))
             set_relevant(sib);
     }
@@ -195,12 +203,12 @@ namespace smt {
         flush();
         if (is_relevant(lit))
             return;        
+        euf::enode* n = ctx.bool_var2enode(lit.var());
+        if (n)
+            mark_relevant(n);
         m_relevant_var_ids.setx(lit.var(), true, false);
         m_trail.push_back(std::make_pair(update::relevant_var, lit.var()));
         m_queue.push_back(std::make_pair(lit, nullptr));
-        euf::enode* n = nullptr;
-        if (n)
-            mark_relevant(n);
     }
 
     void relevancy::propagate_relevant(sat::literal lit) {
@@ -208,9 +216,9 @@ namespace smt {
         for (auto idx : occurs(~lit)) {
             if (m_roots[idx])
                 continue;
-            sat::clause& cl = *m_clauses[idx];
+            sat::clause* cl = m_clauses[idx];
             sat::literal true_lit = sat::null_literal;
-            for (sat::literal lit2 : cl) {
+            for (sat::literal lit2 : *cl) {
                 if (ctx.s().value(lit2) == l_true) {
                     if (is_relevant(lit2))
                         goto next;
@@ -231,7 +239,6 @@ namespace smt {
 
     void relevancy::propagate_relevant(euf::enode* n) {
         relevant_eh(n);
-        // if is_bool_op n, return;
         for (euf::enode* arg : euf::enode_args(n))
             mark_relevant(arg);
     }
diff --git a/src/sat/smt/smt_relevant.h b/src/sat/smt/smt_relevant.h
index 6faa66b0f..a20ca1b44 100644
--- a/src/sat/smt/smt_relevant.h
+++ b/src/sat/smt/smt_relevant.h
@@ -3,7 +3,7 @@ Copyright (c) 2020 Microsoft Corporation
 
 Module Name:
 
-    relevancy.h
+    smt_relevant.h
 
 Abstract:
 
@@ -26,7 +26,7 @@ The state transitions are:
   ->
   lit is set relevant
 
-  lit is justified at level 0
+  lit is justified at search level
   -> 
   lit is set relevant
 
@@ -39,7 +39,7 @@ The state transitions are:
   -> 
   all clauses C in Defs where lit appears negatively are added to Roots
 
- - When a clause R is added to Roots:
+- When a clause R is added to Roots:
   R contains a positive literal lit that is relevant
   ->
   skip adding R to Roots
@@ -72,7 +72,7 @@ Can a literal that is not in a root be set relevant?
  - yes, if we propagate over expressions
 
 Do we need full watch lists instead of 2-watch lists?
- - probably, but unclear. The dual SAT solver only uses 2-watch lists, but has uses a large clause for tracking 
+ - probably, but unclear. The dual SAT solver only uses 2-watch lists, but uses a large clause for tracking 
    roots.
 
 
@@ -105,6 +105,7 @@ namespace smt {
         vector<unsigned_vector>              m_occurs;            // where do literals occur
         unsigned                             m_qhead = 0;         // queue head for relevancy
         svector<std::pair<sat::literal, euf::enode*>> m_queue;    // propagation queue for relevancy
+        ptr_vector<euf::th_solver>          m_relevant_eh;
 
         // callbacks during propagation
         void relevant_eh(euf::enode* n);
@@ -131,6 +132,7 @@ namespace smt {
         void add_def(unsigned n, sat::literal const* lits);
         void asserted(sat::literal lit);
         void propagate();
+        bool can_propagate() const { return m_qhead < m_queue.size(); }
 
         void mark_relevant(euf::enode* n);
         void mark_relevant(sat::literal lit);
@@ -139,6 +141,9 @@ namespace smt {
         bool is_relevant(sat::literal lit) const { return !m_enabled || m_relevant_var_ids.get(lit.var(), false); }
         bool is_relevant(euf::enode* n) const { return !m_enabled || m_relevant_expr_ids.get(n->get_expr_id(), false); }
         bool is_relevant(expr* e) const { return !m_enabled || m_relevant_expr_ids.get(e->get_id(), false); }
-               
+        
+        bool enabled() const { return m_enabled; }
+
+        void add_relevant(euf::th_solver* th) { m_relevant_eh.push_back(th); }
     };
 }