From:  <andrea.condoluci@unibo.it>
Date: Tue, 27 Jun 2017 13:16:43 +0000 (+0200)
Subject: still stepping on negative variables
X-Git-Tag: weak-reduction-separation~72
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=edc8a9dacfdf59bc23570756f7d346f9cd28ae6b;p=fireball-separation.git

still stepping on negative variables
---

diff --git a/ocaml/lambda4.ml b/ocaml/lambda4.ml
index 8a5cc37..c627151 100644
--- a/ocaml/lambda4.ml
+++ b/ocaml/lambda4.ml
@@ -451,7 +451,8 @@ let instantiate p x n =
  let arity_of_x = max_arity_tms x (all_terms p) in
  (if arity_of_x < 0 then failwithProblem p "step on a var of negative arity");
  (* AC: FIXME compute arities correctly below! *)
- let arities = Array.to_list (Array.make (n+1) 0) in
+ let arities = Num.compute_arities x (n+1) (all_terms p :> nf list) in
+ (* let arities = Array.to_list (Array.make (n+1) 0) in *)
  let p,vars = make_fresh_vars p arities in
  (* let p,zero = make_fresh_var p in *)
  (* let zero = Listx.Nil zero in *)
@@ -497,7 +498,9 @@ let auto_instantiate (n,p) =
 1:11m42 2:14m5 3:11m16s 4:14m46s 5:12m7s 6:6m31s *)
 let x =
  try
-  match hd_of (List.find (fun t -> compute_special_k (Listx.Nil (t :> nf)) > 0 && arity_of_hd t >= 0) (all_terms p)) with
+  match hd_of (List.find (fun t ->
+   compute_special_k (Listx.Nil (t :> nf)) > 0 && arity_of_hd t >= 0
+   ) (all_terms p)) with
       None -> assert false
     | Some x ->
        prerr_endline ("INSTANTIATING AND HOPING " ^ string_of_var x);
@@ -733,7 +736,7 @@ in
 
 (********************** problems *******************)
 
-let zero = `Var(0,-1);;
+let zero = `Var(0,0);;
 
 let append_zero =
  function
diff --git a/ocaml/listx.ml b/ocaml/listx.ml
index ecc8a92..821e281 100644
--- a/ocaml/listx.ml
+++ b/ocaml/listx.ml
@@ -56,6 +56,10 @@ let rec max =
   | Nil x -> x
   | Cons (x, l) -> Pervasives.max x (max l)
 
+let rec last =
+  function
+  | Nil x -> x
+  | Cons (_, l) -> last l
 (*
 let rec nth i l = match l, i with
  | Cons (x, _), 1  -> x
@@ -65,4 +69,3 @@ let rec nth i l = match l, i with
  | Nil _, _        -> raise (Invalid_argument "Listx.nth")
 ;;
 *)
-
diff --git a/ocaml/listx.mli b/ocaml/listx.mli
index 97226ae..a43bc4e 100644
--- a/ocaml/listx.mli
+++ b/ocaml/listx.mli
@@ -9,3 +9,4 @@ val to_list : 'a listx -> 'a list
 val from_list : 'a list -> 'a listx
 val split_nth : int -> 'a listx -> 'a list
 val max : 'a listx -> 'a
+val last : 'a listx -> 'a
diff --git a/ocaml/num.ml b/ocaml/num.ml
index 614dde8..81bb1da 100644
--- a/ocaml/num.ml
+++ b/ocaml/num.ml
@@ -157,6 +157,13 @@ let cast_to_i_num_var =
     prerr_endline (print (t :> nf));
     assert false (* algorithm failed *)
 
+let set_arity arity = function
+| `Var(n,_) -> `Var(n,arity)
+| `Lam(false, `N _)
+| `Lam(false, `Lam _) as t -> t
+| `Lam(false, `Match(t,(n,ar),bs_lift,bs,args)) -> `Lam(false, `Match(t,(n,arity),bs_lift,bs,args))
+| _ -> assert false
+
 let rec mk_app (h : nf) (arg : nf) =
 (*let res =*)
  match h with
@@ -174,29 +181,34 @@ and mk_appl h args =
 
 and mk_appx h args = Listx.fold_left mk_app h args
 
-and mk_match t ar bs_lift bs args =
+and mk_match t (n,ar) bs_lift bs args =
  (*prerr_endline ("MK_MATCH: ([" ^ print t ^ "] " ^ String.concat " " (Listx.to_list (Listx.map (fun (n,t) -> string_of_int n ^ " => " ^ print t) bs)) ^ ") " ^ String.concat " " (List.map print args));*)
  match t with
     `N m ->
       (try
         let h = List.assoc m !bs in
+        let h = set_arity (ar-1) h in
         let h = lift bs_lift h in
         mk_appl h args
        with Not_found ->
-        `Match (t,ar,bs_lift,bs,args))
-  | `I _ | `Var _ | `Match _ -> `Match(t,ar,bs_lift,bs,args)
+        `Match (t,(n,ar),bs_lift,bs,args))
+  | `I _ | `Var _ | `Match _ -> `Match(t,(n,ar),bs_lift,bs,args)
 
 and subst delift_by_one what (with_what : nf) (where : nf) =
+ let aux_propagate_arity ar = function
+ | `Lam(false,`Match(`I(v,args),(x,_),liftno,bs,args')) ->
+    `Lam(false,`Match(`I(v,args),(x,ar),liftno,bs,args'))
+ | _ as t -> t in
  let rec aux_i_num_var l =
   function
      `I((n,ar),args) ->
        if n = what + l then
-        mk_appx (lift l with_what) (Listx.map (aux l) args)
+        mk_appx (lift l (aux_propagate_arity ar with_what)) (Listx.map (aux l) args)
        else
         `I (((if delift_by_one && n >= l then n-1 else n), ar), Listx.map (aux l) args)
    | `Var(n,ar) ->
        if n = what + l then
-        lift l with_what
+        lift l (aux_propagate_arity ar with_what)
        else
         `Var((if delift_by_one && n >= l then n-1 else n), ar)
    | `N _ as x -> x
@@ -303,3 +315,29 @@ let max_arity_tms n =
   List.fold_left (fun acc t -> Pervasives.max acc (aux l t)) ~-1 in
  fun tms -> aux_tms 0 (tms :> nf list)
 ;;
+
+let get_first_args var =
+let rec aux l = function
+| `Lam(_,t) -> aux (l+1) t
+| `Match(u,orig,liftno,bs,args) -> Util.concat_map (aux l) args
+| `I((n,_), args) -> if n = var + l then [Listx.last args] else []
+| `N _
+| `Var _ -> []
+in aux 0
+;;
+
+let compute_arities m =
+ let rec aux n tms =
+  if n = 0
+   then []
+   else
+    let tms = Util.filter_map (function `Lam(_,t) -> Some t | _ -> None ) tms in
+    let arity = max 0 (max_arity_tms (m-n) tms) in (* FIXME: 0 or -1 ??? *)
+     arity :: (aux (n-1) tms)
+ in fun tms -> List.rev (aux m tms)
+;;
+
+let compute_arities var special_k all_tms =
+ let tms = List.fold_left (fun acc t -> acc @ (get_first_args var t)) [] all_tms in
+ compute_arities special_k tms
+;;
diff --git a/ocaml/num.mli b/ocaml/num.mli
index 5631382..e06a821 100644
--- a/ocaml/num.mli
+++ b/ocaml/num.mli
@@ -33,6 +33,7 @@ val string_of_nf : [<nf] -> string
 val cast_to_i_var : [< nf > `I `Var] -> i_var
 val cast_to_i_n_var : [< nf > `I `N `Var] -> i_n_var
 val cast_to_i_num_var : [< nf > `I `N `Match `Var] -> i_num_var
+val set_arity : int -> nf -> nf
 val mk_app : nf -> nf -> nf
 val mk_appl : nf -> nf list -> nf
 val mk_appx : nf -> nf Listx.listx -> nf
@@ -43,3 +44,4 @@ val eta_compare : nf -> nf -> int
 val eta_eq : [< nf ] -> [< nf ] -> bool
 val eta_subterm : [< nf ] -> [< nf ] -> bool
 val max_arity_tms : int -> [< nf] list -> int
+val compute_arities : int -> int -> nf list -> int list
diff --git a/ocaml/problems.ml b/ocaml/problems.ml
index e91c580..a0ff453 100644
--- a/ocaml/problems.ml
+++ b/ocaml/problems.ml
@@ -289,8 +289,7 @@ main ([
  (* p2 ; p4 ; p5 ; p6 ; p7 ; p8 ; p9 ; p10 ; p11 ; p12 ; p13 ; p14 ; p15 ; p16 ; p17 ; p18 ; p19 ; p20 ; p21 ; p22 ; p23 ; p24 ; p25 ; p26 ; p27 ; p28 ; p29 ; p30 ; p31 ; p32 ; p33 ; p34 ; p35 ; p36 ; p37 ; *)
  p24 ; p25 ;
 ] @ List.map ((|>) ()) [
- q1 ; q2; q3; q4 ; q5 ;
- q6 ;
+ q1 ; q2; q3; q4 ; q5 ; q6 ;
  (* q7 ; *)
  q8 ;
  q9 ;