+ (bag, maxvar), c
+ ;;
+
+ let mk_passive (bag,maxvar) = mk_clause bag maxvar;;
+ let mk_goal (bag,maxvar) = mk_clause bag maxvar;;
+
+ (* TODO : global age over facts and goals (without comparing weights) *)
+ let select ~use_age passives g_passives =
+ if is_passive_set_empty passives then begin
+ assert (not (is_passive_set_empty g_passives));
+ let g_cl = pick_min_passive ~use_age:use_age g_passives in
+ (true,g_cl,passives,remove_passive_clause g_passives g_cl)
+ end
+ else let cl = pick_min_passive ~use_age:use_age passives in
+ if is_passive_set_empty g_passives then
+ (false,cl,remove_passive_clause passives cl,g_passives)
+ else
+ let g_cl = pick_min_passive ~use_age:use_age g_passives in
+ let (id1,_,_,_),(id2,_,_,_) = snd cl, snd g_cl in
+ let cmp = if use_age then id1 <= id2
+ else fst cl <= fst g_cl
+ in
+ if cmp then
+ (false,cl,remove_passive_clause passives cl,g_passives)
+ else
+ (true,g_cl,passives,remove_passive_clause g_passives g_cl)
+ ;;
+
+ let backward_infer_step bag maxvar actives passives
+ g_actives g_passives g_current =
+ (* superposition left, simplifications on goals *)
+ debug "infer_left step...";
+ let bag, maxvar, new_goals =
+ Sup.infer_left bag maxvar g_current actives
+ in
+ debug "Performed infer_left step";
+ bag, maxvar, actives, passives, g_current::g_actives,
+ (add_passive_goals g_passives new_goals)
+ ;;
+
+ let forward_infer_step bag maxvar actives passives g_actives
+ g_passives current =
+ (* forward step *)
+
+ (* e = select P *
+ * e' = demod A e *
+ * A' = demod [e'] A *
+ * A'' = A' + e' *
+ * e'' = fresh e' *
+ * new = supright e'' A'' *
+ * new'= demod A'' new *
+ * P' = P + new' *)
+ debug "Forward infer step...";
+ let bag, maxvar, actives, new_clauses =
+ Sup.infer_right bag maxvar current actives
+ in
+ debug "Demodulating goals with actives...";
+ (* keep goals demodulated w.r.t. actives and check if solved *)
+ let bag, g_actives =
+ List.fold_left
+ (fun (bag,acc) c ->
+ match
+ Sup.simplify_goal ~no_demod:false maxvar (snd actives) bag acc c
+ with
+ | None -> bag, acc
+ | Some (bag,c) -> bag,c::acc)
+ (bag,[]) g_actives
+ in
+ let ctable = IDX.index_unit_clause IDX.DT.empty current in
+ let bag, maxvar, new_goals =
+ List.fold_left
+ (fun (bag,m,acc) g ->
+ let bag, m, ng = Sup.infer_left bag m g ([current],ctable) in
+ bag,m,ng@acc)
+ (bag,maxvar,[]) g_actives
+ in
+ bag, maxvar, actives,
+ add_passive_clauses passives new_clauses, g_actives,
+ add_passive_goals g_passives new_goals
+ ;;
+
+ let rec given_clause ~noinfer
+ bag maxvar iterno max_steps timeout
+ actives passives g_actives g_passives
+ =
+ let iterno = iterno + 1 in
+ if iterno = max_steps then
+ raise (Failure ("No iterations left !",bag,maxvar,iterno));
+ (* timeout check: gettimeofday called only if timeout set *)
+ if timeout <> None &&
+ (match timeout with
+ | None -> assert false
+ | Some timeout -> Unix.gettimeofday () > timeout) then
+ if noinfer then
+ begin
+ debug
+ ("Last chance: all is indexed " ^ string_of_float
+ (Unix.gettimeofday()));
+ let maxgoals = 100 in
+ ignore(List.fold_left
+ (fun (acc,i) x ->
+ if i < maxgoals then
+ ignore(Sup.simplify_goal ~no_demod:true
+ maxvar (snd actives) bag acc x)
+ else
+ ();
+ x::acc,i+1)
+ ([],0) g_actives);
+ raise (Failure (("Last chance: failed over " ^
+ string_of_int maxgoals^ " goal " ^
+ string_of_float (Unix.gettimeofday())),bag,maxvar,0));
+ end
+ else if false then (* activates last chance strategy *)
+ begin
+ debug("Last chance: "^string_of_float (Unix.gettimeofday()));
+ given_clause ~noinfer:true bag maxvar iterno max_steps
+ (Some (Unix.gettimeofday () +. 20.))
+ actives passives g_actives g_passives;
+ raise (Failure ("Timeout !",bag,maxvar,iterno))
+ end
+ else raise (Failure ("Timeout !",bag,maxvar,iterno));
+
+ let use_age = iterno mod 5 = 0 in
+
+ let rec aux_select bag passives g_passives =
+ let backward,(weight,current),passives,g_passives =
+ select ~use_age passives g_passives
+ in
+ if use_age && weight > monster then
+ let bag,cl = Utils.add_to_bag bag current in
+ if backward then
+ aux_select bag passives (add_passive_clause g_passives cl)
+ else
+ aux_select bag (add_passive_clause passives cl) g_passives
+ else
+ if backward then
+ let _ = debug ("Selected goal : " ^ Pp.pp_unit_clause current) in
+ match
+ if noinfer then
+ if weight > monster then None else Some (bag,current)
+ else
+ Sup.simplify_goal
+ ~no_demod:false maxvar (snd actives) bag g_actives current
+ with
+ | None -> aux_select bag passives g_passives
+ | Some (bag,g_current) ->
+ if noinfer then
+ let g_actives = g_current :: g_actives in
+ bag,maxvar,actives,passives,g_actives,g_passives
+ else
+ backward_infer_step bag maxvar actives passives
+ g_actives g_passives g_current
+ else
+ let _ = debug ("Selected fact : " ^ Pp.pp_unit_clause current) in
+ (*let is_orphan = Sup.orphan_murder bag (fst actives) current in*)
+ match
+ if noinfer then
+ if weight > monster then bag,None
+ else bag, Some (current,actives)
+ else if Sup.orphan_murder bag (fst actives) current then
+ let (id,_,_,_) = current in
+ let bag = Terms.M.add id (current,true) bag in
+ bag, None
+ else Sup.keep_simplified current actives bag maxvar
+ with
+ (*match Sup.one_pass_simplification current actives bag maxvar with*)
+ | bag,None -> aux_select bag passives g_passives
+ | bag,Some (current,actives) ->
+(* if is_orphan then prerr_endline
+ ("WRONG discarded: " ^ (Pp.pp_unit_clause current));
+ List.iter (fun x ->
+ prerr_endline (Pp.pp_unit_clause x))
+ (fst actives);*)
+
+(* List.iter (fun (id,_,_,_) -> let (cl,d) =
+ Terms.M.find id bag in
+ if d then prerr_endline
+ ("WRONG discarded: " ^ (Pp.pp_unit_clause cl)))
+ (current::fst actives);*)
+ if noinfer then
+ let actives =
+ current::fst actives,
+ IDX.index_unit_clause (snd actives) current
+ in
+ bag,maxvar,actives,passives,g_actives,g_passives
+ else
+ forward_infer_step bag maxvar actives passives
+ g_actives g_passives current
+ in
+
+
+ (*prerr_endline "Active table :";
+ (List.iter (fun x -> prerr_endline (Pp.pp_unit_clause x))
+ (fst actives)); *)
+
+ let bag,maxvar,actives,passives,g_actives,g_passives =
+ aux_select bag passives g_passives
+ in
+ debug
+ (Printf.sprintf "Number of active goals : %d"
+ (List.length g_actives));
+ debug
+ (Printf.sprintf "Number of passive goals : %d"
+ (passive_set_cardinal g_passives));
+ debug
+ (Printf.sprintf "Number of actives : %d" (List.length (fst actives)));
+ debug
+ (Printf.sprintf "Number of passives : %d"
+ (passive_set_cardinal passives));
+ given_clause ~noinfer
+ bag maxvar iterno max_steps timeout
+ actives passives g_actives g_passives
+ ;;
+
+ let paramod ~max_steps ?timeout (bag,maxvar) ~g_passives ~passives =
+ let initial_timestamp = Unix.gettimeofday () in
+ let passives =
+ add_passive_clauses ~no_weight:true passive_empty_set passives
+ in
+ let g_passives =
+ add_passive_goals ~no_weight:true passive_empty_set g_passives
+ in
+ let g_actives = [] in
+ let actives = [], IDX.DT.empty in
+ try
+ given_clause ~noinfer:false
+ bag maxvar 0 max_steps timeout actives passives g_actives g_passives
+ with
+ | Sup.Success (bag, _, (i,_,_,_)) ->
+ let l =