X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Flambda-delta%2Fbasic_rg%2FbrgReduction.ml;h=03ed05b053a603985fea79550c313397b3cfe675;hb=2b1375e4b44e2ef351a6341a5bb0a4823e8daae5;hp=4cfd5260db1b70dfcf43da9455883dae55343a4f;hpb=41bf338d7e638ebb5d97e525055bff05b1f0f045;p=helm.git

diff --git a/helm/software/lambda-delta/basic_rg/brgReduction.ml b/helm/software/lambda-delta/basic_rg/brgReduction.ml
index 4cfd5260d..03ed05b05 100644
--- a/helm/software/lambda-delta/basic_rg/brgReduction.ml
+++ b/helm/software/lambda-delta/basic_rg/brgReduction.ml
@@ -9,195 +9,202 @@
      \ /   This software is distributed as is, NO WARRANTY.              
       V_______________________________________________________________ *)
 
+module U = NUri
 module C = Cps
 module S = Share
 module L = Log
+module Y = Entity
+module P = Output
 module B = Brg
 module O = BrgOutput
 module E = BrgEnvironment
 
-exception LRefNotFound of B.message
-
-type machine = {
-   c: B.context;
-   s: B.term list
+type kam = {
+   e: B.lenv;                 (* environment *)
+   s: (B.lenv * B.term) list; (* stack       *)
+   d: int                     (* depth       *)
 }
 
-type whd_result =
-   | Sort_ of int
-   | LRef_ of int * B.term option
-   | GRef_ of int * B.bind
-   | Bind_ of B.id * B.term * B.term
-
-type ho_whd_result =
-   | Sort of int
-   | Abst of B.term
-
 (* Internal functions *******************************************************)
 
 let level = 5
 
-let error i = raise (LRefNotFound (L.items1 (string_of_int i)))
-
-let empty_machine = {c = B.empty_context; s = []}
-
-let get f c m i =
-   let f = function
-      | Some (_, b) -> f b
-      | None        -> error i
+let log1 s c t =
+   let sc, st = s ^ " in the environment", "the term" in
+   L.log O.specs level (L.et_items1 sc c st t)
+
+let log2 s cu u ct t =
+   let s1, s2, s3 = s ^ " in the environment", "the term", "and in the environment" in
+   L.log O.specs level (L.et_items2 s1 cu s2 u ~sc2:s3 ~c2:ct s2 t)
+
+let rec list_and map = function
+   | hd1 :: tl1, hd2 :: tl2 ->
+      if map hd1 hd2 then list_and map (tl1, tl2) else false
+   | l1, l2                 -> l1 = l2
+
+(* check closure *)
+let are_alpha_convertible err f t1 t2 =
+   let rec aux f = function
+      | B.Sort (_, p1), B.Sort (_, p2)
+      | B.LRef (_, p1), B.LRef (_, p2)         ->
+         if p1 = p2 then f () else err ()
+      | B.GRef (_, u1), B.GRef (_, u2)         ->
+         if U.eq u1 u2 then f () else err ()
+      | B.Cast (_, v1, t1), B.Cast (_, v2, t2)         
+      | B.Appl (_, v1, t1), B.Appl (_, v2, t2) ->
+         let f _ = aux f (t1, t2) in
+	 aux f (v1, v2)
+      | B.Bind (_, b1, t1), B.Bind (_, b2, t2) ->
+         let f _ = aux f (t1, t2) in
+	 aux_bind f (b1, b2)
+      | _                                      -> err ()
+   and aux_bind f = function
+      | B.Abbr v1, B.Abbr v2
+      | B.Abst v1, B.Abst v2                   -> aux f (v1, v2)
+      | B.Void, B.Void                         -> f ()
+      | _                                      -> err ()
    in
-   let f gl _ = if i < gl then B.get f c i else B.get f m.c (i - gl) in
-   B.contents f c 
-
-let contents f c m =
-   let f gl ges = B.contents (f gl ges) m.c in
-   B.contents f c
-
-let unwind_to_context f c m = B.append f c m.c
-
-let unwind_to_term f m t =
-   let map f t (id, b) = f (B.Bind (id, b, t)) in
-   let f _ mc = C.list_fold_left f map t mc in
-   B.contents f m.c
-
-let rec lref_map_bind f map b = match b with
-   | B.Abbr v ->
-      let f v' = f (S.sh1 v v' b B.abbr) in
-      lref_map f map v      
-   | B.Abst w ->
-      let f w' = f (S.sh1 w w' b B.abst) in
-      lref_map f map w
-   | B.Void   -> f b
-
-and lref_map f map t = match t with
-   | B.LRef i          -> f (B.LRef (map i))
-   | B.GRef _          -> f t
-   | B.Sort _          -> f t
-   | B.Cast (w, u)     ->
-      let f w' u' = f (S.sh2 w w' u u' t B.cast) in
-      let f w' = lref_map (f w') map u in 
-      lref_map f map w
-   | B.Appl (w, u)     ->
-      let f w' u' = f (S.sh2 w w' u u' t B.appl) in
-      let f w' = lref_map (f w') map u in 
-      lref_map f map w
-   | B.Bind (id, b, u) ->
-      let f b' u' = f (S.sh2 b b' u u' t (B.bind id)) in
-      let f b' = lref_map (f b') map u in 
-      lref_map_bind f map b
+   if S.eq t1 t2 then f () else aux f (t1, t2)
 
-(* to share *)
-let lift f c m = 
-   let f gl _ =
-      let map i = if i >= gl then succ i else i in
-      let map f = function
-         | id, B.Abbr t -> let f t = f (id, B.Abbr t) in lref_map f map t
-         | _            -> assert false
-      in
-      let f mc = f {m with c = mc} in
-      B.map f map m.c
-   in
-   B.contents f c
+let get m i =
+   let _, c, a, b = B.get m.e i in c, a, b
 
 (* to share *)
-let xchg f c m t =
-   let f gl _ ll _ =
-      let map i =
-         if i < gl || i > gl + ll then i else
-         if i >= gl && i < gl + ll then succ i else gl
-      in
-      lref_map f map t
-   in
-   contents f c m
-
-let push f c m id w t = 
-   assert (m.s = []);   
-   let f c m = xchg (f c m) c m t in  
-   let f c = lift (f c) c m in
-   let f w = B.push f c id (B.Abst w) in
-   unwind_to_term f m w
-
-(* to share *)
-let rec whd f c m x = match x with
-   | B.Sort h                 -> f m (Sort_ h)
-   | B.GRef uri               ->
-      let f (i, _, b) = f m (GRef_ (i, b)) in
-      E.get_obj f uri
-   | B.LRef i                 ->
-      let f = function
-         | B.Void   -> f m (LRef_ (i, None))
-	 | B.Abst t -> f m (LRef_ (i, Some t))
-	 | B.Abbr t -> whd f c m t
-      in
-      get f c m i
-   | B.Cast (_, t)            -> whd f c m t
-   | B.Appl (v, t)            -> whd f c {m with s = v :: m.s} t   
-   | B.Bind (id, B.Abst w, t) -> 
+let rec step st m x = 
+(*   L.warn "entering R.step"; *)
+   match x with
+   | B.Sort _                -> m, None, x
+   | B.GRef (_, uri)         ->
+      begin match E.get_entity uri with
+         | _, _, Y.Abbr v when st.Y.delta ->
+	    P.add ~gdelta:1 (); step st m v
+         | _, _, Y.Abst w when st.Y.rt    ->
+            P.add ~grt:1 (); step st m w	 
+	 | a, _, Y.Abbr v                 ->
+	    let e = Y.apix C.err C.start a in
+	    m, Some (e, a, B.Abbr v), x   
+	 | a, _, Y.Abst w                 ->
+	    let e = Y.apix C.err C.start a in
+	    m, Some (e, a, B.Abst w), x
+	 | _, _, Y.Void                   -> assert false
+      end
+   | B.LRef (_, i)           ->
+      begin match get m i with
+	 | c, _, B.Abbr v              ->
+	    P.add ~ldelta:1 ();
+	    step st {m with e = c} v
+	 | c, _, B.Abst w when st.Y.rt ->
+            P.add ~lrt:1 ();
+            step st {m with e = c} w
+	 | c, _, B.Void                ->
+	    assert false
+	 | c, a, (B.Abst _ as b)       ->
+	    let e = Y.apix C.err C.start a in
+	    {m with e = c}, Some (e, a, b), x
+      end
+   | B.Cast (_, _, t)        ->
+      P.add ~tau:1 ();
+      step st m t
+   | B.Appl (_, v, t)        ->
+      step st {m with s = (m.e, v) :: m.s} t   
+   | B.Bind (a, B.Abst w, t) ->
       begin match m.s with
-         | []      -> f m (Bind_ (id, w, t))
-	 | v :: tl -> 
-	    let f mc = whd f c {c = mc; s = tl} t in
-	    B.push f m.c id (B.Abbr (B.Cast (w, v)))
+         | []          -> m, None, x
+	 | (c, v) :: s ->
+            P.add ~beta:1 ~upsilon:(List.length s) ();
+	    let e = B.push m.e c a (B.abbr v) (* (B.Cast ([], w, v)) *) in 
+	    step st {m with e = e; s = s} t
       end
-   | B.Bind (id, b, t)        -> 
-      let f mc = whd f c {m with c = mc} t in
-      B.push f m.c id b
+   | B.Bind (a, b, t)        ->
+      P.add ~upsilon:(List.length m.s) ();
+      let e = B.push m.e m.e a b in 
+      step st {m with e = e} t
+
+let push m a b = 
+   assert (m.s = []);
+   let a, d = match b with
+      | B.Abst _ -> Y.Apix m.d :: a, succ m.d
+      | b        -> a, m.d
+   in
+   let e = B.push m.e m.e a b in
+   {m with e = e; d = d}
+
+let rec ac_nfs st (m1, r1, u) (m2, r2, t) =
+   log2 "Now converting nfs" m1.e u m2.e t;
+   match r1, u, r2, t with
+      | _, B.Sort (_, h1), _, B.Sort (_, h2)                   ->
+         h1 = h2  
+      | Some (e1, _, B.Abst _), _, Some (e2, _, B.Abst _), _   ->
+	 if e1 = e2 then ac_stacks st m1 m2 else false
+      | Some (e1, _, B.Abbr v1), _, Some (e2, _, B.Abbr v2), _ ->
+         if e1 = e2 then
+	    if ac_stacks st m1 m2 then true else begin
+	       P.add ~gdelta:2 (); ac st m1 v1 m2 v2
+	    end
+	 else if e1 < e2 then begin 
+            P.add ~gdelta:1 ();
+	    ac_nfs st (m1, r1, u) (step st m2 v2)
+	 end else begin
+	    P.add ~gdelta:1 ();
+	    ac_nfs st (step st m1 v1) (m2, r2, t) 
+         end
+      | _, _, Some (_, _, B.Abbr v2), _                        ->
+         P.add ~gdelta:1 ();
+	 ac_nfs st (m1, r1, u) (step st m2 v2)      
+      | Some (_, _, B.Abbr v1), _, _, _                        ->
+         P.add ~gdelta:1 ();
+	 ac_nfs st (step st m1 v1) (m2, r2, t)             
+      | _, B.Bind (a1, (B.Abst w1 as b1), t1), 
+        _, B.Bind (a2, (B.Abst w2 as b2), t2)                  ->
+	 if ac {st with Y.si = false} m1 w1 m2 w2 then
+	    ac st (push m1 a1 b1) t1 (push m2 a2 b2) t2
+	 else false
+      | _, B.Sort _, _, B.Bind (a, b, t) when st.Y.si          ->
+	 P.add ~si:1 ();
+	 ac st (push m1 a b) u (push m2 a b) t
+      | _                                                      -> false
+
+and ac st m1 t1 m2 t2 =
+(*   L.warn "entering R.are_convertible"; *)
+   ac_nfs st (step st m1 t1) (step st m2 t2)
+
+and ac_stacks st m1 m2 =
+(*   L.warn "entering R.are_convertible_stacks"; *)
+   if List.length m1.s <> List.length m2.s then false else
+   let map (c1, v1) (c2, v2) =
+      let m1, m2 = {m1 with e = c1; s = []}, {m2 with e = c2; s = []} in
+      ac {st with Y.si = false} m1 v1 m2 v2
+   in
+   list_and map (m1.s, m2.s)
 
 (* Interface functions ******************************************************)
 
-let rec ho_whd f c m x =
-   let aux m = function
-      | Sort_ h             -> f c (Sort h)
-      | Bind_ (_, w, _)     -> 
-         let f c = f c (Abst w) in unwind_to_context f c m
-      | LRef_ (_, Some w)   -> ho_whd f c m w
-      | GRef_ (_, B.Abst u) -> ho_whd f c m u
-      | GRef_ (_, B.Abbr t) -> ho_whd f c m t
-      | LRef_ (_, None)     -> assert false
-      | GRef_ (_, B.Void)   -> assert false
-   in
-   whd aux c m x
-   
-let ho_whd f c t =
-   L.log O.specs level (L.ct_items1 "Now scanning" c t);
-   ho_whd f c empty_machine t
-
-let rec are_convertible f c1 m1 t1 c2 m2 t2 =
-   let rec aux m1 r1 m2 r2 = match r1, r2 with
-      | Sort_ h1, Sort_ h2                           -> f (h1 = h2)
-      | LRef_ (i1, _), LRef_ (i2, _)                 ->
-         if i1 = i2 then are_convertible_stacks f c1 m1 c2 m2 else f false
-      | GRef_ (a1, B.Abst _), GRef_ (a2, B.Abst _)   ->
-         if a1 = a2 then are_convertible_stacks f c1 m1 c2 m2 else f false
-      | GRef_ (a1, B.Abbr v1), GRef_ (a2, B.Abbr v2) ->
-         if a1 = a2 then are_convertible_stacks f c1 m1 c2 m2 else
-	 if a1 < a2 then whd (aux m1 r1) c2 m2 v2 else
-	 whd (aux_rev m2 r2) c1 m1 v1
-      | _, GRef_ (_, B.Abbr v2)                      ->
-         whd (aux m1 r1) c2 m2 v2
-      | GRef_ (_, B.Abbr v1), _                      ->
-	 whd (aux_rev m2 r2) c1 m1 v1
-      | Bind_ (id1, w1, t1), Bind_ (id2, w2, t2)     ->
-         let f b = 
-	    if b then 
-	       let f c1 m1 t1 = 
-	          push (are_convertible f c1 m1 t1) c2 m2 id2 w2 t2
-	       in
-               push f c1 m1 id1 w1 t1
-	    else f false
-	 in
-	 are_convertible f c1 m1 w1 c2 m2 w2
-      | _                                              -> f false
-   and aux_rev m2 r2 m1 r1 = aux m1 r1 m2 r2 in
-   let f m1 r1 = whd (aux m1 r1) c2 m2 t2 in 
-   whd f c1 m1 t1
-
-and are_convertible_stacks f c1 m1 c2 m2 =
-   let mm1, mm2 = {m1 with s = []}, {m2 with s = []} in
-   let map f v1 v2 = are_convertible f c1 mm1 v1 c2 mm2 v2 in
-   if List.length m1.s <> List.length m2.s then f false else
-   C.forall2 f map m1.s m2.s
-
-let are_convertible f c t1 t2 = 
-   L.log O.specs level (L.ct_items2 "Now converting" c t1 "and" c t2);
-   are_convertible f c empty_machine t1 c empty_machine t2
+let empty_kam = { 
+   e = B.empty; s = []; d = 0
+}
+
+let get m i =
+   assert (m.s = []);
+   let _, _, _, b = B.get m.e i in b
+
+let xwhd st m t =
+   L.box level; log1 "Now scanning" m.e t;   
+   let m, _, t = step {st with Y.delta = true; Y.rt = true} m t in
+   L.unbox level; m, t
+
+let are_convertible st mu u mw w = 
+   L.box level; log2 "Now converting" mu.e u mw.e w;
+   let r = ac {st with Y.delta = st.Y.expand; Y.rt = false} mu u mw w in   
+   L.unbox level; r
+(*    let err _ = in 
+      if S.eq mu mw then are_alpha_convertible err f u w else err () *)
+
+(* error reporting **********************************************************)
+
+let pp_term m frm t = O.specs.L.pp_term m.e frm t
+
+let pp_lenv frm m = O.specs.L.pp_lenv frm m.e
+
+let specs = {
+   L.pp_term = pp_term; L.pp_lenv = pp_lenv
+}