295 lines
7.8 KiB
OCaml
295 lines
7.8 KiB
OCaml
(**************************************************************************)
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(* *)
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(* MiniLustre *)
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(* *)
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(* Author : Marc Pouzet *)
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(* Organization : Demons, LRI, University of Paris-Sud, Orsay *)
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(* *)
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(**************************************************************************)
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(* clock checking *)
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(* $Id$ *)
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open Misc
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open Ident
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open Minils
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open Global
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open Location
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type error = | Etypeclash of ct * ct
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exception TypingError of error
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exception Unify
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let error kind = raise (TypingError(kind))
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let message e kind =
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begin match kind with
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Etypeclash(actual_ct, expected_ct) ->
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Printf.eprintf "%aClock Clash: this expression has clock %a, \n\
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but is expected to have clock %a.\n"
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Printer.print_exp e
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Printer.print_clock actual_ct
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Printer.print_clock expected_ct
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end;
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raise Error
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let index = ref 0
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let gen_index () = incr index; !index
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let new_var () = Cvar { contents = Cindex (gen_index ()) }
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let rec repr ck =
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match ck with
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Cbase | Con _ | Cvar { contents = Cindex _ } -> ck
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| Cvar ({ contents = Clink(ck) } as link) ->
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let ck = repr ck in
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link.contents <- Clink(ck);
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ck
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let rec occur_check index ck =
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let ck = repr ck in
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match ck with
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Cbase -> ()
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| Cvar { contents = Cindex n } when index <> n -> ()
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| Con(ck, _, _) -> occur_check index ck
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| _ -> raise Unify
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let rec ck_value ck =
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match ck with
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| Cbase | Con _ | Cvar { contents = Cindex _ } -> ck
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| Cvar { contents = Clink(ck) } ->
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ck_value ck
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let rec unify t1 t2 =
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if t1 == t2 then ()
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else match t1, t2 with
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Ck(ck1), Ck(ck2) -> unify_ck ck1 ck2
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| Cprod(ct_list1), Cprod(ct_list2) ->
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begin try
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List.iter2 unify ct_list1 ct_list2
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with
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_ -> raise Unify
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end
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| _ -> raise Unify
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and unify_ck ck1 ck2 =
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let ck1 = repr ck1 in
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let ck2 = repr ck2 in
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if ck1 == ck2 then ()
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else match ck1, ck2 with
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Cbase, Cbase -> ()
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| Cvar { contents = Cindex n1 }, Cvar { contents = Cindex n2 }
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when n1 = n2 -> ()
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| Cvar ({ contents = Cindex n1 } as v), _ ->
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occur_check n1 ck2;
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v.contents <- Clink(ck2)
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| _, Cvar ({contents = Cindex n2 } as v) ->
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occur_check n2 ck1;
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v.contents <- Clink(ck1)
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| Con(ck1, c1, n1), Con(ck2, c2, n2) when (c1 = c2) & (n1 = n2) ->
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unify_ck ck1 ck2
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| _ -> raise Unify
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let rec eq ck1 ck2 =
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match repr ck1, repr ck2 with
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| Cbase, Cbase -> true
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| Cvar { contents = Cindex n1 }, Cvar { contents = Cindex n2 } -> true
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| Con(ck1, _, n1), Con(ck2, _, n2) when (n1 = n2) -> eq ck1 ck2
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| _ -> false
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let rec unify t1 t2 =
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match t1, t2 with
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Ck(ck1), Ck(ck2) -> unify_ck ck1 ck2
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| Cprod(t1_list), Cprod(t2_list) -> unify_list t1_list t2_list
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| _ -> raise Unify
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and unify_list t1_list t2_list =
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try
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List.iter2 unify t1_list t2_list
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with
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_ -> raise Unify
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let rec skeleton ck = function
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| Tprod(ty_list) -> Cprod(List.map (skeleton ck) ty_list)
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| Tbase _ -> Ck(ck)
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let ckofct = function
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| Ck(ck) -> repr ck
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| Cprod(ct_list) -> Cbase
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let prod = function
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| [] -> assert false
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| [ty] -> ty
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| ty_list -> Tprod(ty_list)
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let typ_of_name h x = Env.find x h
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let rec typing h e =
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let ct = match e.e_desc with
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| Econst _ | Econstvar _ -> Ck(new_var ())
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| Evar(x) -> Ck(typ_of_name h x)
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| Efby(c, e) -> typing h e
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| Etuple(e_list) ->
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Cprod(List.map (typing h) e_list)
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| Eop(_,_, e_list) ->
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let ck = new_var () in
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List.iter (expect h (Ck(ck))) e_list;
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skeleton ck e.e_ty
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| Eapp(_,_, e_list) ->
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let ck_r = new_var () in
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List.iter (expect h (Ck(ck_r))) e_list;
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skeleton ck_r e.e_ty
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| Eevery(_,_, e_list, n) ->
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let ck_r = typ_of_name h n in
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List.iter (expect h (Ck(ck_r))) e_list;
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skeleton ck_r e.e_ty
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| Ewhen(e, c, n) ->
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let ck_n = typ_of_name h n in
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expect h (skeleton ck_n e.e_ty) e;
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skeleton (Con(ck_n, c, n)) e.e_ty
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| Eifthenelse(e1, e2, e3) ->
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let ck = new_var () in
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let ct = skeleton ck e.e_ty in
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expect h (Ck(ck)) e1;
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expect h ct e2;
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expect h ct e3; ct
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| Emerge(n, c_e_list) ->
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let ck_c = typ_of_name h n in
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typing_c_e_list h ck_c n c_e_list;
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skeleton ck_c e.e_ty
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| Efield(e1,n) ->
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let ck = new_var () in
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let ct = skeleton ck e1.e_ty in
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expect h (Ck(ck)) e1;
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ct
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| Estruct(l) ->
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let ck = new_var () in
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List.iter
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(fun (n,e) ->
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let ct = skeleton ck e.e_ty in
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expect h ct e)
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l;
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Ck(ck)
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(*Array operators*)
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| Earray e_list ->
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let ck = new_var () in
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List.iter (expect h (Ck(ck))) e_list;
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skeleton ck e.e_ty
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| Erepeat (_,e) ->
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typing h e
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| Eselect (_,e) ->
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typing h e
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| Eselect_dyn (e_list, _, e, defe) ->
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let ck = new_var () in
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let ct = skeleton ck e.e_ty in
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expect h ct e;
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List.iter (expect h ct) e_list;
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ct
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| Eupdate (_, e1, e2) | Efield_update (_, e1, e2) ->
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let ck = new_var () in
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let ct = skeleton ck e.e_ty in
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expect h (Ck(ck)) e1;
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expect h ct e2;
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ct
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| Eselect_slice (_ , _, e) ->
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typing h e
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| Econcat (e1, e2) ->
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let ck = new_var () in
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let ct = skeleton ck e.e_ty in
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expect h (Ck(ck)) e1;
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expect h ct e2;
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ct
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| Eiterator (_, f, _, _, e_list, _) ->
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let ck_r = new_var () in
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List.iter (expect h (Ck(ck_r))) e_list;
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skeleton ck_r e.e_ty
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| Ereset_mem (_, _, x) -> assert false
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in
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e.e_ck <- ckofct ct;
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ct
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and expect h expected_ty e =
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let actual_ty = typing h e in
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try unify actual_ty expected_ty
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with Unify -> message e (Etypeclash(actual_ty, expected_ty))
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and typing_c_e_list h ck_c n c_e_list =
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let rec typrec = function
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| [] -> ()
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| (c, e) :: c_e_list ->
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expect h (skeleton (Con(ck_c, c, n)) e.e_ty) e;
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typrec c_e_list in
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typrec c_e_list
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let rec typing_pat h = function
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| Evarpat(x) -> Ck(typ_of_name h x)
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| Etuplepat(pat_list) -> Cprod(List.map (typing_pat h) pat_list)
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let typing_eqs h eq_list =
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List.iter
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(fun { p_lhs = pat; p_rhs = e } ->
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(match e.e_desc with
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| Ereset_mem (_, _, x) ->
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let ck = typ_of_name h x in
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e.e_ck <- ck;
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| _ ->
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let ty_pat = typing_pat h pat in
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try
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expect h ty_pat e
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with Error ->
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(* DEBUG *)
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Printf.eprintf "Complete expression: %a\n"
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Printer.print_exp e;
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Printf.eprintf "Clock pattern: %a\n"
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Printer.print_clock ty_pat;
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raise Error
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)
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) eq_list
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let build h dec =
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List.fold_left (fun h { v_name = n } -> Env.add n (new_var ()) h) h dec
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let sbuild h dec base =
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List.fold_left (fun h { v_name = n } -> Env.add n base h) h dec
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let typing_contract h contract base =
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match contract with
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| None -> h
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| Some { c_local = l_list;
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c_eq = eq_list;
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c_assume = e_a;
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c_enforce = e_g;
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c_controllables = c_list } ->
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let h = sbuild h c_list base in
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let h' = build h l_list in
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typing_eqs h' eq_list;
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(* assumption *)
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expect h' (Ck base) e_a;
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(* property *)
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expect h' (Ck base) e_g;
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h
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let typing_node ({ n_name = f; n_input = i_list; n_output = o_list;
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n_contract = contract;
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n_local = l_list; n_equs = eq_list } as node) =
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let base = Cbase in
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let h = sbuild Env.empty i_list base in
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let h = sbuild h o_list base in
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let h = typing_contract h contract base in
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let h = build h l_list in
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typing_eqs h eq_list;
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(*update clock info in variables descriptions *)
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let set_clock vd =
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{ vd with v_clock = ck_value (Env.find vd.v_name h) } in
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{ node with n_input = List.map set_clock i_list;
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n_output = List.map set_clock o_list;
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n_local = List.map set_clock l_list; }
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let program ({ p_nodes = p_node_list } as p) =
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{ p with p_nodes = List.map typing_node p_node_list }
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