X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Flambda-delta%2Fbasic_rg%2FbrgReduction.ml;h=1ae73652d7d9f0778cba8ec7b6705bd5ad3319a0;hb=a22628e5de37d3ffe9de056d7683f2ebdf7226fb;hp=87d093d82f47638ea9580a89996d7f632482e0d6;hpb=75d417a2bb12a56052dd520c513c789fd9256252;p=helm.git

diff --git a/helm/software/lambda-delta/basic_rg/brgReduction.ml b/helm/software/lambda-delta/basic_rg/brgReduction.ml
index 87d093d82..1ae73652d 100644
--- a/helm/software/lambda-delta/basic_rg/brgReduction.ml
+++ b/helm/software/lambda-delta/basic_rg/brgReduction.ml
@@ -11,198 +11,200 @@
 
 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
-module S = BrgSubstitution
 
-exception LRefNotFound of B.message
-
-type machine = {
-   c: B.context;
-   s: (B.term * int) list
+type kam = {
+   e: B.lenv;
+   s: (B.lenv * B.term) list;
+   i: int
 }
 
 (* Internal functions *******************************************************)
 
 let level = 5
 
-let error i = raise (LRefNotFound (L.items1 (string_of_int i)))
-
 let log1 s c t =
-   let sc, st = s ^ " in the context", "the term" in
-   L.log O.specs level (L.ct_items1 sc c st t)
-
-let log2 s c u t =
-   let sc, su, st = s ^ " in the context", "the term", "and the term" in
-   L.log O.specs level (L.ct_items2 sc c su u st t)
-
-let empty_machine = {
-   c = B.empty_context; s = []
-}
-
-let get f c m i =
-   let f e = function
-      | Some (_, b) -> f e b
-      | None        -> error i
+   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 c = B.get f c i in
-   B.append f c m.c
+   if S.eq t1 t2 then f () else aux f (t1, t2)
 
-let lift_stack f s =
-   let map f (v, i) = f (v, succ i) in
-   Cps.list_map f map s
-
-let unwind_to_term f m t =
-   let map f t (a, b) = f (B.Bind (a, b, t)) in
-   let f mc = C.list_fold_left f map t mc in
-   assert (m.s = []);
-   B.contents f m.c
-
-let push f m a b = 
-   assert (m.s = []);
-   f {m with c = (a, b) :: m.c}
+let get m i =
+   let _, c, a, b = B.get m.e i in c, a, b
 
 (* to share *)
-let rec step f ?(delta=false) ?(rt=false) c m x = 
+let rec step st m x = 
 (*   L.warn "entering R.step"; *)
    match x with
-   | B.Sort _                -> f m x
-   | B.GRef (a, uri)         ->
-      let f = function
-         | _, _, B.Abbr v when delta ->
-            P.add ~gdelta:1 ();
-	    step f ~delta ~rt c m v
-         | _, _, B.Abst w when rt   ->
-            P.add ~grt:1 ();
-	    step f ~delta ~rt c m w	 
-	 | e, _, b                   ->
-	    f m (B.GRef (B.Entry (e, b) :: a, uri))
-      in
-      E.get_obj f uri
-   | B.LRef (a, i)           ->
-      let f e = function
-	 | B.Abbr v          ->
+   | 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 f ~delta ~rt c m v
-	 | B.Abst w when rt ->
+	    step st {m with e = c} v
+	 | c, _, B.Abst w when st.Y.rt ->
             P.add ~lrt:1 ();
-            step f ~delta ~rt c m w
-	 | b                 ->
-	    f m (B.LRef (B.Entry (e, b) :: a, i))
-      in
-      let f e = S.lift_bind (f e) (succ i) (0) in 
-      get f c m i
+            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 f ~delta ~rt c m t
+      step st m t
    | B.Appl (_, v, t)        ->
-      step f ~delta ~rt c {m with s = (v, 0) :: m.s} t   
-   | B.Bind (a, B.Abst w, 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 x
-	 | (v, h) :: tl -> 
-            P.add ~beta:1 ~upsilon:(List.length tl) ();
-	    let f mc sc = step f ~delta ~rt c {c = mc; s = sc} t in
-	    let f mc = lift_stack (f mc) tl in 
-	    let f v = B.push f m.c a (B.Abbr (B.Cast ([], w, v))) in
-	    S.lift f h (0) 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 (a, b, t)        -> 
+   | B.Bind (a, b, t)        ->
       P.add ~upsilon:(List.length m.s) ();
-      let f sc mc = step f ~delta ~rt c {c = mc; s = sc} t in
-      let f sc = B.push (f sc) m.c a b in
-      lift_stack f m.s
+      let e = B.push m.e m.e a b in 
+      step st {m with e = e} t
 
-(* Interface functions ******************************************************)
-   
-let domain f c t =
-   let f r = L.unbox level; f r in
-   let f m = function
-      | B.Bind (_, B.Abst w, _) ->
-         let f w = f (Some w) in unwind_to_term f m w
-      | x                       -> f None
+let push m a b = 
+   assert (m.s = []);
+   let a, i = match b with
+      | B.Abst _ -> Y.Apix m.i :: a, succ m.i
+      | b        -> a, m.i
    in
-   L.box level; log1 "Now scanning" c t;
-   step f ~delta:true ~rt:true c empty_machine t
-
-let rec ac_nfs f ~si r c m1 u m2 t =
-(*   L.warn "entering R.are_convertible_aux"; *)
-   log2 "Now converting nfs" c u t;
-   match u, t with
-      | B.Sort (_, h1), B.Sort (_, h2)             ->
-         if h1 = h2 then f r else f false 
-      | B.LRef (B.Entry (e1, B.Abst _) :: _, i1), 
-        B.LRef (B.Entry (e2, B.Abst _) :: _, i2)   ->
-	 P.add ~zeta:(i1+i2-e1-e2) ();
-	 if e1 = e2 then ac_stacks f ~si r c m1 m2 else f false
-      | B.GRef (B.Entry (e1, B.Abst _) :: _, _), 
-        B.GRef (B.Entry (e2, B.Abst _) :: _, _)    ->
-	 if e1 = e2 then ac_stacks f ~si r c m1 m2 else f false
-      | B.GRef (B.Entry (e1, B.Abbr v1) :: _, _), 
-        B.GRef (B.Entry (e2, B.Abbr v2) :: _, _)   ->
+   let e = B.push m.e m.e a b in
+   {m with e = e; i = i}
+
+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
-	    let f r = 
-	       if r then f r 
-	       else begin  
-                  P.add ~gdelta:2 ();
-	          ac f ~si true c m1 v1 m2 v2
-	       end
-	    in
-	    ac_stacks f ~si r c m1 m2
+	    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 ();
-	    step (ac_nfs f ~si r c m1 u) c m2 v2
+	    ac_nfs st (m1, r1, u) (step st m2 v2)
 	 end else begin
 	    P.add ~gdelta:1 ();
-	    step (ac_nfs_rev f ~si r c m2 t) c m1 v1
+	    ac_nfs st (step st m1 v1) (m2, r2, t) 
          end
-      | _, B.GRef (B.Entry (_, B.Abbr v2) :: _, _) ->
+      | _, _, Some (_, _, B.Abbr v2), _                        ->
          P.add ~gdelta:1 ();
-         step (ac_nfs f ~si r c m1 u) c m2 v2      
-      | B.GRef (B.Entry (_, B.Abbr v1) :: _, _), _ ->
+	 ac_nfs st (m1, r1, u) (step st m2 v2)      
+      | Some (_, _, B.Abbr v1), _, _, _                        ->
          P.add ~gdelta:1 ();
-	 step (ac_nfs_rev f ~si r c m2 t) c m1 v1            
-      | B.Bind (a1, (B.Abst w1 as b1), t1), 
-        B.Bind (a2, (B.Abst w2 as b2), t2)         ->
-	 let g m1 m2 = ac f ~si r c m1 t1 m2 t2 in
-         let g m1 = push (g m1) m2 a2 b2 in 
-	 let f r = if r then push g m1 a1 b1 else f false in
-	 ac f ~si r c m1 w1 m2 w2      
-      | B.Sort _, B.Bind (a, b, t) when si         ->
+	 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 ();
-	 let f m1 m2 = ac f ~si r c m1 u m2 t in
-	 let f m1 = push (f m1) m2 a b in
-	 push f m1 a b
-      | _                                          -> f false
+	 ac st (push m1 a b) u (push m2 a b) t
+      | _                                                      -> false
 
-and ac_nfs_rev f ~si r c m2 t m1 u = ac_nfs f ~si r c m1 u m2 t
-
-and ac f ~si r c m1 t1 m2 t2 =
+and ac st m1 t1 m2 t2 =
 (*   L.warn "entering R.are_convertible"; *)
-   let g m1 t1 = step (ac_nfs f ~si r c m1 t1) c m2 t2 in 
-   if r = false then f false else step g c m1 t1
+   ac_nfs st (step st m1 t1) (step st m2 t2)
 
-and ac_stacks f ~si r c m1 m2 =
+and ac_stacks st m1 m2 =
 (*   L.warn "entering R.are_convertible_stacks"; *)
-   let mm1, mm2 = {m1 with s = []}, {m2 with s = []} in
-   let map f r (v1, h1) (v2, h2) =
-      let f v1 = S.lift (ac f ~si r c mm1 v1 mm2) h2 (0) v2 in
-      S.lift f h1 (0) v1
+(*   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
-   if List.length m1.s <> List.length m2.s then 
-      begin 
-(*         L.warn (Printf.sprintf "Different lengths: %u %u"
-	    (List.length m1.s) (List.length m2.s) 
-	 ); *)
-	 f false
-      end
-   else
-      C.list_fold_left2 f map r m1.s m2.s
+   list_and map (m1.s, m2.s)
+
+(* Interface functions ******************************************************)
+
+let empty_kam = { 
+   e = B.empty; s = []; i = 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 = false; 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 are_convertible f ?(si=false) c u t = 
-   let f b = L.unbox level; f b in
-   L.box level; log2 "Now converting" c u t;
-   ac f ~si true c empty_machine u empty_machine t
+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
+}