type t = (StateSet.t*StateSet.t) NodeHash.t
(** Map from nodes to query and recognizing states *)
-(* Note that we do not consider the nil nodes *)
+(* Note that we do not consider nil nodes *)
exception Oracle_fail
exception Over_max_fail
(* Mapped sets for leaves *)
let map_leaf asta = (Asta.bot_states_s asta, StateSet.empty)
-let empty = (StateSet.empty,StateSet.empty)
(* Build the Oracle *)
let rec bu_oracle asta run tree tnode =
then ()
else NodeHash.add run node (map_leaf asta)
else
- let tfnode = Tree.first_child tree tnode (* first child *)
- and tnnode = Tree.next_sibling tree tnode in (* next-sibling *)
- let fnode,nnode =
+ let tfnode = Tree.first_child tree tnode
+ and tnnode = Tree.next_sibling tree tnode in
+ let fnode,nnode = (* their preorders *)
(Tree.preorder tree tfnode, Tree.preorder tree tnnode) in
begin
bu_oracle asta run tree tfnode;
bu_oracle asta run tree tnnode;
- let q_rec n =
+ let q_rec n = (* compute the set for child/sibling *)
try NodeHash.find run n
with Not_found -> map_leaf asta in
let (_,qfr),(_,qnr) = q_rec fnode,q_rec nnode (* computed in rec call *)
and lab = Tree.tag tree tnode in
- let _,list_tr = Asta.transitions_lab asta lab in (* only take reco. *)
- let rec result set = function
- | [] -> set
+ let _,list_tr = Asta.transitions_lab asta lab in (* only reco. tran.*)
+ let rec result set flag = function (* add states which satisfy a transition *)
+ | [] -> set,flag
| (q,form) :: tl ->
- if Formula.eval_form (qfr,qnr) form
- then result (StateSet.add q set) tl
- else result set tl in
- let result_set = result StateSet.empty list_tr in
- NodeHash.add run node (StateSet.empty, result_set)
+ if Formula.eval_form (set,qfr,qnr) form (* evaluates the formula*)
+ then
+ if StateSet.mem q set
+ then result set 0 tl
+ else result (StateSet.add q set) 1 tl
+ else result set 0 tl in
+ let rec fix_point set_i = (* compute the fixed point of states of node *)
+ let set,flag = result set_i 0 list_tr in
+ if flag = 0 then set
+ else fix_point set in
+ NodeHash.add run node (StateSet.empty, fix_point StateSet.empty)
end
-
+
(* Build the over-approx. of the maximal run *)
let rec bu_over_max asta run tree tnode =
if (Tree.is_leaf tree tnode) (* BU_oracle has already created the map *)
let q_rec n =
try NodeHash.find run n
with Not_found -> map_leaf asta in
- let (qfq,qfr),(qnq,qnr) = q_rec fnode,q_rec nnode in
+ let qf,qn = q_rec fnode,q_rec nnode in
let lab = Tree.tag tree tnode in
- let list_tr,_ = Asta.transitions_lab asta lab in (* only take query st. *)
- let rec result set = function
- | [] -> set
- | (q,form) :: tl ->
- if Formula.infer_form (qfq,qnq) (qfr,qnr) form
- then result (StateSet.add q set) tl
- else result set tl in
- let _,resultr = try NodeHash.find run node
+ let list_tr,_ = Asta.transitions_lab asta lab (* only take query st. *)
+ and _,resultr = try NodeHash.find run node
with _ -> raise Over_max_fail in
- let result_set = result StateSet.empty list_tr in
+ let rec result set flag = function
+ | [] -> set,flag
+ | (q,form) :: tl ->
+ if Formula.infer_form (set,resultr) qf qn form (* infers the formula*)
+ then if StateSet.mem q set
+ then result set 0 tl
+ else result (StateSet.add q set) 1 tl
+ else result set 0 tl in
+ let rec fix_point set_i =
+ let set,flag = result set_i 0 list_tr in
+ if flag = 0
+ then set
+ else fix_point set in
+ let result_set = fix_point StateSet.empty in
+ (* we keep the old recognizing states set *)
NodeHash.replace run node (result_set, resultr)
- (* Never remove elt in Hash (the old one would appear) *)
end
let (fnode,nnode) =
(Tree.preorder tree tfnode, Tree.preorder tree tnnode) in
begin
- if tnode == Tree.root tree (* we must intersectt with top states *)
+ if tnode == Tree.root tree (* we must intersect with top states *)
then let setq,_ = try NodeHash.find run node
with _ -> raise Max_fail in
NodeHash.replace run node
let q_rec n =
try NodeHash.find run n
with Not_found -> map_leaf asta in
- let (qfq,qfr),(qnq,qnr) = q_rec fnode,q_rec nnode in
+ let qf,qn = q_rec fnode,q_rec nnode in
let lab = Tree.tag tree tnode in
let list_tr,_ = Asta.transitions_lab asta lab in (* only take query. *)
- let set_node,_ = try NodeHash.find run node
- with _ -> raise Max_fail in
+ let (set_node,set_nr) as self = try NodeHash.find run node
+ with Not_found -> raise Max_fail in
+ (* We must compute again accepting states from self transitions since
+ previous calls of tp_max may remove them *)
+ let rec comp_acc_self set flag =
+ () (* given a current set of states we add
+ states from self transitions which satisfy the two conditions *)
+ (* With result (below) we have all valid transitions at step 0
+ we compute the self states which occur in it and which are not in cthe current state.
+ For each of these states we compute the transitions with the correct label and state
+ we infer each of these transitions: true -> add self states occuring in it
+ to the acc and to the current set + add left and right states as result do *)
+ (* ----> With a FIFO *)
+ and fix_point selfq_i =
+ () in
+ NodeHash.replace run node (set_node, set_nr);
+
let rec result = function
| [] -> []
| (q,form) :: tl ->
- if (Formula.infer_form (qfq,qnq) (qfr,qnr) form) &&
- (StateSet.mem q set_node)
+ if (StateSet.mem q set_node) && (* infers & trans. can start here *)
+ (Formula.infer_form self qf qn form)
then form :: (result tl)
else result tl in
- let list_form = result list_tr in
+ let list_form = result list_tr in (* tran. candidates *)
+ (* compute states occuring in transition candidates *)
let rec add_st (ql,qr) = function
| [] -> ql,qr
| f :: tl -> let sql,sqr = Formula.st f in
if tnnode == Tree.nil
then ()
else NodeHash.replace run nnode (StateSet.inter qnq qr,qnr);
+ (* indeed we delete all states from self transitions! *)
tp_max asta run tree tfnode;
tp_max asta run tree tnnode;
end;
let compute tree asta =
let flag = 2 in (* debug *)
- let size_tree = 10000 in (* todo *)
+ let size_tree = 10000 in (* todo (Tree.size ?) *)
let map = NodeHash.create size_tree in
bu_oracle asta map tree (Tree.root tree);
if flag > 0 then begin
projects / tatoo.git / blobdiff