+let typecheck_obj,already_set = ref (fun _ -> assert false), ref false;;
+let set_typecheck_obj f =
+ if !already_set then
+ assert false
+ else
+ begin
+ typecheck_obj := f;
+ already_set := true
+ end
+;;
+
+let cache = NUri.UriHash.create 313;;
+let frozen_list = ref [];;
+
+exception Propagate of NUri.uri * exn;;
+
+let get_checked_obj u =
+ if List.exists (fun (k,_) -> NUri.eq u k) !frozen_list
+ then
+ raise (CircularDependency (lazy (NUri.string_of_uri u)))
+ else
+ let obj =
+ try NUri.UriHash.find cache u
+ with
+ Not_found ->
+ let saved_frozen_list = !frozen_list in
+ try
+ let obj =
+ try NCicLibrary.get_obj u
+ with
+ NCicLibrary.ObjectNotFound m -> raise (ObjectNotFound m)
+ in
+ frozen_list := (u,obj)::saved_frozen_list;
+ !typecheck_obj obj;
+ frozen_list := saved_frozen_list;
+ let obj = `WellTyped obj in
+ NUri.UriHash.add cache u obj;
+ obj
+ with
+ Sys.Break as e ->
+ frozen_list := saved_frozen_list;
+ raise e
+ | Propagate (u',_) as e' ->
+ frozen_list := saved_frozen_list;
+ let exn = `Exn (BadDependency (lazy (NUri.string_of_uri u ^
+ " depends (recursively) on " ^ NUri.string_of_uri u' ^
+ " which is not well-typed"))) in
+ NUri.UriHash.add cache u exn;
+ if saved_frozen_list = [] then
+ exn
+ else
+ raise e'
+ | e ->
+ frozen_list := saved_frozen_list;
+ let exn = `Exn e in
+ NUri.UriHash.add cache u exn;
+ if saved_frozen_list = [] then
+ exn
+ else
+ raise (Propagate (u,e))
+ in
+ match obj with
+ `WellTyped o -> o
+ | `Exn e -> raise e
+;;
+
+let get_checked_decl = function
+ | Ref.Ref (uri, Ref.Decl) ->
+ (match get_checked_obj uri with
+ | _,height,_,_, C.Constant (rlv,name,None,ty,att) ->
+ rlv,name,ty,att,height
+ | _,_,_,_, C.Constant (_,_,Some _,_,_) ->
+ prerr_endline "get_checked_decl on a definition"; assert false
+ | _ -> prerr_endline "get_checked_decl on a non decl 2"; assert false)
+ | _ -> prerr_endline "get_checked_decl on a non decl"; assert false