mirror of
https://github.com/c-cube/sidekick.git
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Simpler representation of solver types
This commit is contained in:
Guillaume Bury
parent
898cfee53e
commit
ce05d8fe62
4 changed files with 225 additions and 204 deletions
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@ -43,7 +43,7 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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mutable var_inc : float;
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(* increment for variables' activity *)
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trail : (semantic var, atom) Either.t Vec.t;
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trail : (lit, atom) Either.t Vec.t;
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(* decision stack + propagated atoms *)
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trail_lim : int Vec.t;
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@ -152,16 +152,22 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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let get_var_id v = v.vid
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let get_var_level v = v.level
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let get_var_weight v = v.weight
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let set_var_weight v w = v.weight <- w
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let set_var_level v l = v.level <- l
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let get_elt_id e = Either.destruct e get_var_id get_var_id
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let get_elt_weight e = Either.destruct e get_var_weight get_var_weight
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let get_elt_level e = Either.destruct e get_var_level get_var_level
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(* Accessors for litterals *)
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let get_lit_id v = v.lid
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let get_lit_level (v : lit) = v.level
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let get_lit_weight (v : lit) = v.weight
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let set_lit_weight (v : lit) w = v.weight <- w
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let set_lit_level (v : lit) l = v.level <- l
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let set_elt_weight e = Either.destruct e set_var_weight set_var_weight
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let set_elt_level e = Either.destruct e set_var_level set_var_level
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let get_elt_id e = Either.destruct e get_lit_id get_var_id
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let get_elt_weight e = Either.destruct e get_lit_weight get_var_weight
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let get_elt_level e = Either.destruct e get_lit_level get_var_level
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let set_elt_weight e = Either.destruct e set_lit_weight set_var_weight
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let set_elt_level e = Either.destruct e set_lit_level set_var_level
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let f_weight i j =
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get_elt_weight (St.get_var j) < get_elt_weight (St.get_var i)
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@ -171,10 +177,10 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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(* Var/clause activity *)
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let insert_var_order e = Either.destruct e
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(fun v -> Iheap.insert f_weight env.order v.vid)
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(fun v -> Iheap.insert f_weight env.order v.lid)
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(fun v ->
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Iheap.insert f_weight env.order v.vid;
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iter_sub (fun t -> Iheap.insert f_weight env.order t.vid) v
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iter_sub (fun t -> Iheap.insert f_weight env.order t.lid) v
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)
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let var_decay_activity () =
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@ -194,9 +200,20 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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if Iheap.in_heap env.order v.vid then
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Iheap.decrease f_weight env.order v.vid
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let lit_bump_activity_aux (v : lit) =
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v.weight <- v.weight +. env.var_inc;
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if v.weight > 1e100 then begin
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for i = 0 to (St.nb_vars ()) - 1 do
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set_elt_weight (St.get_var i) ((get_elt_weight (St.get_var i)) *. 1e-100)
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done;
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env.var_inc <- env.var_inc *. 1e-100;
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end;
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if Iheap.in_heap env.order v.lid then
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Iheap.decrease f_weight env.order v.lid
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let var_bump_activity v =
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var_bump_activity_aux v;
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iter_sub (fun t -> var_bump_activity_aux t) v
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iter_sub lit_bump_activity_aux v
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let clause_bump_activity c =
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c.activity <- c.activity +. env.clause_inc;
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@ -258,7 +275,7 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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for c = env.qhead to Vec.size env.trail - 1 do
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Either.destruct (Vec.get env.trail c)
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(fun v ->
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v.tag.assigned <- None;
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v.assigned <- None;
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v.level <- -1;
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insert_var_order (Either.mk_left v)
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)
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@ -270,7 +287,7 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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a.is_true <- false;
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a.neg.is_true <- false;
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a.var.level <- -1;
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a.var.tag.reason <- Bcp None;
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a.var.reason <- Bcp None;
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insert_var_order (Either.mk_right a.var)
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end)
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done;
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@ -292,19 +309,19 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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if a.is_true then
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L.debug 10 "Litteral %a already in queue" pp_atom a
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else begin
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assert (a.var.level < 0 && a.var.tag.reason = Bcp None && lvl >= 0);
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assert (a.var.level < 0 && a.var.reason = Bcp None && lvl >= 0);
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a.is_true <- true;
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a.var.level <- lvl;
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a.var.tag.reason <- reason;
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a.var.reason <- reason;
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Vec.push env.trail (Either.mk_right a);
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L.debug 2 "Enqueue (%d): %a" (nb_assigns ()) pp_atom a
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end
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let enqueue_assign (v: semantic var) value lvl =
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v.tag.assigned <- Some value;
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let enqueue_assign v value lvl =
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v.assigned <- Some value;
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v.level <- lvl;
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Vec.push env.trail (Either.mk_left v);
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L.debug 2 "Enqueue (%d): %a" (nb_assigns ()) St.pp_semantic_var v
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L.debug 2 "Enqueue (%d): %a" (nb_assigns ()) St.pp_lit v
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let th_eval a =
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if a.is_true || a.neg.is_true then None
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@ -334,7 +351,7 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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let c = ref (Proof.to_list c_clause) in
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let history = ref [c_clause] in
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clause_bump_activity c_clause;
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let is_semantic a = match a.var.tag.reason with
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let is_semantic a = match a.var.reason with
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| Semantic _ -> true
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| _ -> false
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in
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@ -355,15 +372,15 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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decr tr_ind;
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L.debug 20 "Looking at trail element %d" !tr_ind;
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Either.destruct (Vec.get env.trail !tr_ind)
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(fun v -> L.debug 15 "%a" St.pp_semantic_var v)
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(fun a -> match a.var.tag.reason with
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(fun v -> L.debug 15 "%a" St.pp_lit v)
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(fun a -> match a.var.reason with
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| Bcp (Some d) ->
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L.debug 15 "Propagation : %a" St.pp_atom a;
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L.debug 15 " |- %a" St.pp_clause d;
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let tmp, res = Proof.resolve (Proof.merge !c (Proof.to_list d)) in
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begin match tmp with
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| [] -> L.debug 15 "No lit to resolve over."
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| [b] when b == a.var.tag.pa ->
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| [b] when b == a.var.pa ->
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clause_bump_activity d;
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var_bump_activity a.var;
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history := d :: !history;
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@ -419,7 +436,7 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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decr pathC;
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let p = get_atom !tr_ind in
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decr tr_ind;
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match !pathC, p.var.tag.reason with
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match !pathC, p.var.reason with
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| 0, _ ->
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cond := false;
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learnt := p.neg :: (List.rev !learnt)
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@ -429,7 +446,11 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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List.iter (fun q -> q.var.seen <- false) !seen;
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!blevel, !learnt, !history, true
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let analyze c_clause = if St.mcsat then analyze_mcsat c_clause else analyze_sat c_clause
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let analyze c_clause =
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if St.mcsat then
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analyze_mcsat c_clause
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else
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analyze_sat c_clause
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let record_learnt_clause confl blevel learnt history is_uip =
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begin match learnt with
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@ -627,7 +648,7 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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a
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let slice_get i = Either.destruct (Vec.get env.trail i)
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(function {level; tag={term; assigned = Some v}} -> Th.Assign (term, v), level | _ -> assert false)
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(function {level; term; assigned = Some v} -> Th.Assign (term, v), level | _ -> assert false)
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(fun a -> Th.Lit a.lit, a.var.level)
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let slice_push l lemma =
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@ -771,26 +792,26 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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if v.level >= 0 then
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pick_branch_lit ()
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else begin
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let value = Th.assign v.tag.term in
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let value = Th.assign v.term in
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env.decisions <- env.decisions + 1;
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new_decision_level();
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let current_level = decision_level () in
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L.debug 5 "Deciding on %a" St.pp_semantic_var v;
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L.debug 5 "Deciding on %a" St.pp_lit v;
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enqueue_assign v value current_level
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end)
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(fun v ->
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if v.level >= 0 then begin
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assert (v.tag.pa.is_true || v.tag.na.is_true);
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assert (v.pa.is_true || v.na.is_true);
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pick_branch_lit ()
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end else match Th.eval v.tag.pa.lit with
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end else match Th.eval v.pa.lit with
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| Th.Unknown ->
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env.decisions <- env.decisions + 1;
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new_decision_level();
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let current_level = decision_level () in
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L.debug 5 "Deciding on %a" St.pp_atom v.tag.pa;
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enqueue_bool v.tag.pa current_level (Bcp None)
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L.debug 5 "Deciding on %a" St.pp_atom v.pa;
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enqueue_bool v.pa current_level (Bcp None)
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| Th.Valued (b, lvl) ->
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let a = if b then v.tag.pa else v.tag.na in
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let a = if b then v.pa else v.na in
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enqueue_bool a lvl (Semantic lvl))
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let search n_of_conflicts n_of_learnts =
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@ -872,8 +893,8 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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Vec.grow_to_by_double env.learnts nbc;
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env.nb_init_clauses <- nbc;
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St.iter_vars (fun e -> Either.destruct e
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(fun v -> L.debug 50 " -- %a" St.pp_semantic_var v)
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(fun a -> L.debug 50 " -- %a" St.pp_atom a.tag.pa)
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(fun v -> L.debug 50 " -- %a" St.pp_lit v)
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(fun a -> L.debug 50 " -- %a" St.pp_atom a.pa)
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);
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add_clauses ?tag cnf
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@ -883,8 +904,8 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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let eval lit =
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let var, negated = make_boolean_var lit in
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assert (var.tag.pa.is_true || var.tag.na.is_true);
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let truth = var.tag.pa.is_true in
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assert (var.pa.is_true || var.na.is_true);
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let truth = var.pa.is_true in
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if negated then not truth else truth
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let hyps () = env.clauses
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@ -896,7 +917,7 @@ module Make (L : Log_intf.S)(St : Solver_types.S)
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let model () =
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let opt = function Some a -> a | None -> assert false in
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Vec.fold (fun acc e -> Either.destruct e
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(fun (v: semantic var) -> (v.tag.term, opt v.tag.assigned) :: acc)
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(fun v -> (v.term, opt v.assigned) :: acc)
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(fun _ -> acc)
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) [] env.trail
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@ -64,7 +64,7 @@ module Make(L : Log_intf.S)(St : Solver_types.S) = struct
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if equal_atoms a b then
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aux resolved (a :: acc) r
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else if equal_atoms St.(a.neg) b then
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aux (St.(a.var.tag.pa) :: resolved) acc r
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aux (St.(a.var.pa) :: resolved) acc r
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else
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aux resolved (a :: acc) (b :: r)
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in
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@ -133,7 +133,7 @@ module Make(L : Log_intf.S)(St : Solver_types.S) = struct
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diff_learnt (b :: acc) l r'
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| _ -> raise (Resolution_error "Impossible to derive correct clause")
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let clause_unit a = match St.(a.var.level, a.var.tag.reason) with
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let clause_unit a = match St.(a.var.level, a.var.reason) with
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| 0, St.Bcp Some c -> c, to_list c
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| _ ->
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raise (Resolution_error "Could not find a reason needed to resolve")
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@ -189,7 +189,7 @@ module Make(L : Log_intf.S)(St : Solver_types.S) = struct
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| [] -> true
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| a :: r ->
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L.debug 2 "Eliminating %a in %a" St.pp_atom a St.pp_clause c;
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let d = match St.(a.var.level, a.var.tag.reason) with
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let d = match St.(a.var.level, a.var.reason) with
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| 0, St.Bcp Some d -> d
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| _ -> raise Exit
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in
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@ -334,10 +334,10 @@ module Make(L : Log_intf.S)(St : Solver_types.S) = struct
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if f_args <> [] then
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Format.fprintf fmt "<TD>%a</TD></TR>%a%a" St.print_atom (List.hd f_args)
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(fun fmt -> List.iter (fun a -> Format.fprintf fmt "<TR><TD>%a</TD></TR>" St.print_atom a)) (List.tl f_args)
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(fun fmt -> List.iter (fun v -> Format.fprintf fmt "<TR><TD>%a</TD></TR>" St.print_semantic_var v)) t_args
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(fun fmt -> List.iter (fun v -> Format.fprintf fmt "<TR><TD>%a</TD></TR>" St.print_lit v)) t_args
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else if t_args <> [] then
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Format.fprintf fmt "<TD>%a</TD></TR>%a" St.print_semantic_var (List.hd t_args)
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(fun fmt -> List.iter (fun v -> Format.fprintf fmt "<TR><TD>%a</TD></TR>" St.print_semantic_var v)) (List.tl t_args)
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Format.fprintf fmt "<TD>%a</TD></TR>%a" St.print_lit (List.hd t_args)
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(fun fmt -> List.iter (fun v -> Format.fprintf fmt "<TR><TD>%a</TD></TR>" St.print_lit v)) (List.tl t_args)
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else
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Format.fprintf fmt "<TD></TD></TR>"
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in
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@ -27,40 +27,42 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
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type formula = E.Formula.t
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type proof = Th.proof
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type 'a var =
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{ vid : int;
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tag : 'a;
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mutable weight : float;
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type lit = {
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lid : int;
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term : term;
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mutable level : int;
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mutable seen : bool;
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mutable weight : float;
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mutable assigned : term option;
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}
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type semantic =
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{ term : term;
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mutable assigned : term option; }
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type boolean = {
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type var = {
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vid : int;
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pa : atom;
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na : atom;
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mutable seen : bool;
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mutable level : int;
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mutable weight : float;
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mutable reason : reason;
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}
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and atom =
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{ var : boolean var;
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lit : formula;
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and atom = {
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aid : int;
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var : var;
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neg : atom;
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mutable watched : clause Vec.t;
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lit : formula;
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mutable is_true : bool;
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aid : int }
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mutable watched : clause Vec.t;
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}
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and clause =
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{ name : string;
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and clause = {
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name : string;
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tag : int option;
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atoms : atom Vec.t;
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learnt : bool;
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cpremise : premise;
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mutable activity : float;
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mutable removed : bool;
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learnt : bool;
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cpremise : premise }
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}
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and reason =
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| Semantic of int
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@ -70,20 +72,19 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
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| History of clause list
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| Lemma of proof
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type elt = (semantic var, boolean var) Either.t
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type elt = (lit, var) Either.t
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(* Dummy values *)
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let dummy_lit = E.dummy
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let rec dummy_var =
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{ vid = -101;
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level = -1;
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weight = -1.;
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seen = false;
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tag = {
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pa = dummy_atom;
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na = dummy_atom;
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reason = Bcp None; };
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seen = false;
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level = -1;
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weight = -1.;
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reason = Bcp None;
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}
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and dummy_atom =
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{ var = dummy_var;
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@ -124,13 +125,11 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
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try MT.find t_map t
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with Not_found ->
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let res = {
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vid = !cpt_mk_var;
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lid = !cpt_mk_var;
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term = t;
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weight = 1.;
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level = -1;
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seen = false;
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tag = {
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term = t;
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assigned = None; };
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assigned = None;
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} in
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incr cpt_mk_var;
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MT.add t_map t res;
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@ -145,13 +144,12 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
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let cpt_fois_2 = !cpt_mk_var lsl 1 in
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let rec var =
|
||||
{ vid = !cpt_mk_var;
|
||||
level = -1;
|
||||
weight = 0.;
|
||||
seen = false;
|
||||
tag = {
|
||||
pa = pa;
|
||||
na = na;
|
||||
reason = Bcp None;};
|
||||
seen = false;
|
||||
level = -1;
|
||||
weight = 0.;
|
||||
reason = Bcp None;
|
||||
}
|
||||
and pa =
|
||||
{ var = var;
|
||||
|
|
@ -177,7 +175,7 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
|
|||
|
||||
let add_atom lit =
|
||||
let var, negated = make_boolean_var lit in
|
||||
if negated then var.tag.na else var.tag.pa
|
||||
if negated then var.na else var.pa
|
||||
|
||||
let make_clause ?tag name ali sz_ali is_learnt premise =
|
||||
let atoms = Vec.from_list ali sz_ali dummy_atom in
|
||||
|
|
@ -217,7 +215,7 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
|
|||
List.iter f (Mi.find v.vid !iter_map)
|
||||
with Not_found ->
|
||||
let l = ref [] in
|
||||
Th.iter_assignable (fun t -> l := add_term t :: !l) v.tag.pa.lit;
|
||||
Th.iter_assignable (fun t -> l := add_term t :: !l) v.pa.lit;
|
||||
iter_map := Mi.add v.vid !l !iter_map;
|
||||
List.iter f !l
|
||||
|
||||
|
|
@ -227,7 +225,7 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
|
|||
name, (List.map add_atom l), (List.map add_term l'), color
|
||||
|
||||
(* Pretty printing for atoms and clauses *)
|
||||
let print_semantic_var fmt (v: semantic var) = E.Term.print fmt v.tag.term
|
||||
let print_lit fmt v = E.Term.print fmt v.term
|
||||
|
||||
let print_atom fmt a = E.Formula.print fmt a.lit
|
||||
|
||||
|
|
@ -243,10 +241,10 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
|
|||
Format.fprintf fmt "%s : %a" c.name print_atoms c.atoms
|
||||
|
||||
(* Complete debug printing *)
|
||||
let sign a = if a==a.var.tag.pa then "" else "-"
|
||||
let sign a = if a == a.var.pa then "" else "-"
|
||||
|
||||
let level a =
|
||||
match a.var.level, a.var.tag.reason with
|
||||
match a.var.level, a.var.reason with
|
||||
| n, _ when n < 0 -> assert false
|
||||
| 0, Bcp (Some c) -> sprintf "->0/%s" c.name
|
||||
| 0, Bcp None -> "@0"
|
||||
|
|
@ -267,9 +265,9 @@ module Make (L : Log_intf.S)(E : Expr_intf.S)(Th : Plugin_intf.S with
|
|||
| None -> ()
|
||||
| Some t -> bprintf b "[assignment: %s]" (Log.on_fmt E.Term.print t)
|
||||
|
||||
let pp_semantic_var b v =
|
||||
let pp_lit b v =
|
||||
bprintf b "%d [lit:%s]%a"
|
||||
(v.vid+1) (Log.on_fmt E.Term.print v.tag.term) pp_assign v.tag.assigned
|
||||
(v.lid+1) (Log.on_fmt E.Term.print v.term) pp_assign v.assigned
|
||||
|
||||
let pp_atom b a =
|
||||
bprintf b "%s%d%s[lit:%s]"
|
||||
|
|
|
|||
|
|
@ -20,53 +20,55 @@ module type S = sig
|
|||
type formula
|
||||
type proof
|
||||
|
||||
type 'a var =
|
||||
{ vid : int;
|
||||
tag : 'a;
|
||||
mutable weight : float;
|
||||
type lit = {
|
||||
lid : int;
|
||||
term : term;
|
||||
mutable level : int;
|
||||
mutable seen : bool; }
|
||||
mutable weight : float;
|
||||
mutable assigned : term option;
|
||||
}
|
||||
|
||||
type semantic =
|
||||
{ term : term;
|
||||
mutable assigned : term option; }
|
||||
|
||||
type boolean = {
|
||||
type var = {
|
||||
vid : int;
|
||||
pa : atom;
|
||||
na : atom;
|
||||
mutable seen : bool;
|
||||
mutable level : int;
|
||||
mutable weight : float;
|
||||
mutable reason : reason;
|
||||
}
|
||||
|
||||
and atom = {
|
||||
var : boolean var;
|
||||
lit : formula;
|
||||
aid : int;
|
||||
var : var;
|
||||
neg : atom;
|
||||
mutable watched : clause Vec.t;
|
||||
lit : formula;
|
||||
mutable is_true : bool;
|
||||
aid : int
|
||||
mutable watched : clause Vec.t;
|
||||
}
|
||||
|
||||
and clause = {
|
||||
name : string;
|
||||
tag : int option;
|
||||
atoms : atom Vec.t;
|
||||
learnt : bool;
|
||||
cpremise : premise;
|
||||
mutable activity : float;
|
||||
mutable removed : bool;
|
||||
learnt : bool;
|
||||
cpremise : premise
|
||||
}
|
||||
|
||||
and reason =
|
||||
| Semantic of int
|
||||
| Bcp of clause option
|
||||
|
||||
and premise =
|
||||
| History of clause list
|
||||
| Lemma of proof
|
||||
|
||||
type elt = (semantic var, boolean var) Either.t
|
||||
type elt = (lit, var) Either.t
|
||||
(** Recursive types for literals (atoms) and clauses *)
|
||||
|
||||
val dummy_var : boolean var
|
||||
val dummy_var : var
|
||||
val dummy_atom : atom
|
||||
val dummy_clause : clause
|
||||
(** Dummy values for use in vector dummys *)
|
||||
|
|
@ -78,13 +80,13 @@ module type S = sig
|
|||
|
||||
val add_atom : formula -> atom
|
||||
(** Returns the atom associated with the given formula *)
|
||||
val add_term : term -> semantic var
|
||||
val add_term : term -> lit
|
||||
(** Returns the variable associated with the term *)
|
||||
val make_boolean_var : formula -> boolean var * bool
|
||||
val make_boolean_var : formula -> var * bool
|
||||
(** Returns the variable linked with the given formula, and wether the atom associated with the formula
|
||||
is [var.pa] or [var.na] *)
|
||||
|
||||
val iter_sub : (semantic var -> unit) -> boolean var -> unit
|
||||
val iter_sub : (lit -> unit) -> var -> unit
|
||||
(** Iterates over the semantic var corresponding to subterms of the fiven literal, according
|
||||
to Th.iter_assignable *)
|
||||
|
||||
|
|
@ -99,16 +101,16 @@ module type S = sig
|
|||
val fresh_hname : unit -> string
|
||||
(** Fresh names for clauses *)
|
||||
|
||||
val proof_debug : proof -> string * (atom list) * (semantic var list) * (string option)
|
||||
val proof_debug : proof -> string * (atom list) * (lit list) * (string option)
|
||||
(** Debugging info for proofs (see Plugin_intf). *)
|
||||
|
||||
val print_lit : Format.formatter -> lit -> unit
|
||||
val print_atom : Format.formatter -> atom -> unit
|
||||
val print_semantic_var : Format.formatter -> semantic var -> unit
|
||||
val print_clause : Format.formatter -> clause -> unit
|
||||
(** Pretty printing functions for atoms and clauses *)
|
||||
|
||||
val pp_lit : Buffer.t -> lit -> unit
|
||||
val pp_atom : Buffer.t -> atom -> unit
|
||||
val pp_semantic_var : Buffer.t -> semantic var -> unit
|
||||
val pp_clause : Buffer.t -> clause -> unit
|
||||
(** Debug function for atoms and clauses (very verbose) *)
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue