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(* ----------------------------------------------------------------------------
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 * SchedMCore - A MultiCore Scheduling Framework
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 * Copyright (C) 2009-2011, ONERA, Toulouse, FRANCE - LIFL, Lille, FRANCE
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 *
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 * This file is part of Prelude
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 *
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 * Prelude is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public License
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 * as published by the Free Software Foundation ; either version 2 of
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 * the License, or (at your option) any later version.
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 *
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 * Prelude is distributed in the hope that it will be useful, but
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 * WITHOUT ANY WARRANTY ; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this program ; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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 * USA
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 *---------------------------------------------------------------------------- *)
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(** Main typing module. Classic inference algorithm with destructive
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    unification. *)
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let debug fmt args = () (* Format.eprintf "%a"  *)
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(* Though it shares similarities with the clock calculus module, no code
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    is shared.  Simple environments, very limited identifier scoping, no
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    identifier redefinition allowed. *)
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open Utils
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(* Yes, opening both modules is dirty as some type names will be
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   overwritten, yet this makes notations far lighter.*)
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open LustreSpec
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open Corelang
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open Types
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open Format
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let pp_typing_env fmt env =
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  Env.pp_env print_ty fmt env
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(** [occurs tvar ty] returns true if the type variable [tvar] occurs in
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    type [ty]. False otherwise. *)
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let rec occurs tvar ty =
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  let ty = repr ty in
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  match ty.tdesc with
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  | Tvar -> ty=tvar
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  | Tarrow (t1, t2) ->
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      (occurs tvar t1) || (occurs tvar t2)
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  | Ttuple tl ->
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      List.exists (occurs tvar) tl
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  | Tarray (_, t)
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  | Tstatic (_, t)
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  | Tclock t
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  | Tlink t -> occurs tvar t
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  | Tenum _ | Tconst _ | Tunivar | Tint | Treal | Tbool | Trat -> false
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(** Promote monomorphic type variables to polymorphic type variables. *)
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(* Generalize by side-effects *)
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let rec generalize ty =
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  match ty.tdesc with
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  | Tvar ->
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      (* No scopes, always generalize *)
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      ty.tdesc <- Tunivar
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  | Tarrow (t1,t2) ->
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      generalize t1; generalize t2
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  | Ttuple tlist ->
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      List.iter generalize tlist
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  | Tstatic (d, t)
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  | Tarray (d, t) -> Dimension.generalize d; generalize t
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  | Tclock t
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  | Tlink t ->
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      generalize t
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  | Tenum _ | Tconst _ | Tunivar | Tint | Treal | Tbool | Trat -> ()
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(** Downgrade polymorphic type variables to monomorphic type variables *)
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let rec instantiate inst_vars inst_dim_vars ty =
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  let ty = repr ty in
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  match ty.tdesc with
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  | Tenum _ | Tconst _ | Tvar | Tint | Treal | Tbool | Trat -> ty
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  | Tarrow (t1,t2) ->
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      {ty with tdesc =
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       Tarrow ((instantiate inst_vars inst_dim_vars t1), (instantiate inst_vars inst_dim_vars t2))}
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  | Ttuple tlist ->
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      {ty with tdesc = Ttuple (List.map (instantiate inst_vars inst_dim_vars) tlist)}
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  | Tclock t ->
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	{ty with tdesc = Tclock (instantiate inst_vars inst_dim_vars t)}
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  | Tstatic (d, t) ->
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	{ty with tdesc = Tstatic (Dimension.instantiate inst_dim_vars d, instantiate inst_vars inst_dim_vars t)}
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  | Tarray (d, t) ->
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	{ty with tdesc = Tarray (Dimension.instantiate inst_dim_vars d, instantiate inst_vars inst_dim_vars t)}
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  | Tlink t ->
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	(* should not happen *)
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	{ty with tdesc = Tlink (instantiate inst_vars inst_dim_vars t)}
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  | Tunivar ->
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      try
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        List.assoc ty.tid !inst_vars
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      with Not_found ->
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        let var = new_var () in
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	inst_vars := (ty.tid, var)::!inst_vars;
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	var
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(* [type_coretype cty] types the type declaration [cty] *)
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let rec type_coretype type_dim cty =
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  match (*get_repr_type*) cty with
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  | Tydec_any -> new_var ()
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  | Tydec_int -> Type_predef.type_int
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  | Tydec_real -> Type_predef.type_real
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  | Tydec_float -> Type_predef.type_real
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  | Tydec_bool -> Type_predef.type_bool
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  | Tydec_clock ty -> Type_predef.type_clock (type_coretype type_dim ty)
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  | Tydec_const c -> Type_predef.type_const c
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  | Tydec_enum tl -> Type_predef.type_enum tl
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  | Tydec_array (d, ty) ->
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    begin
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      type_dim d;
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      Type_predef.type_array d (type_coretype type_dim ty)
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    end
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(* [coretype_type is the reciprocal of [type_typecore] *)
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let rec coretype_type ty =
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 match (repr ty).tdesc with
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 | Tvar           -> Tydec_any
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 | Tint           -> Tydec_int
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 | Treal          -> Tydec_real
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 | Tbool          -> Tydec_bool
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 | Tconst c       -> Tydec_const c
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 | Tclock t       -> Tydec_clock (coretype_type t)
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 | Tenum tl       -> Tydec_enum tl
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 | Tarray (d, t)  -> Tydec_array (d, coretype_type t)
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 | Tstatic (_, t) -> coretype_type t
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 | _         -> assert false
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let get_type_definition tname =
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  try
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    type_coretype (fun d -> ()) (Hashtbl.find type_table (Tydec_const tname))
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  with Not_found -> raise (Error (Location.dummy_loc, Unbound_type tname))
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139
(** [unify t1 t2] unifies types [t1] and [t2]. Raises [Unify
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    (t1,t2)] if the types are not unifiable.*)
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(* Standard destructive unification *)
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let rec unify t1 t2 =
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  let t1 = repr t1 in
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  let t2 = repr t2 in
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  if t1=t2 then
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    ()
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  else
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    (* No type abbreviations resolution for now *)
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    match t1.tdesc,t2.tdesc with
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      (* This case is not mandory but will keep "older" types *)
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    | Tvar, Tvar ->
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        if t1.tid < t2.tid then
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          t2.tdesc <- Tlink t1
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        else
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          t1.tdesc <- Tlink t2
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    | (Tvar, _) when (not (occurs t1 t2)) ->
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        t1.tdesc <- Tlink t2
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    | (_,Tvar) when (not (occurs t2 t1)) ->
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        t2.tdesc <- Tlink t1
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    | Tarrow (t1,t2), Tarrow (t1',t2') ->
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      begin
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        unify t1 t1';
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	unify t2 t2'
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      end
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    | Ttuple tlist1, Ttuple tlist2 ->
166
        if (List.length tlist1) <> (List.length tlist2) then
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	  raise (Unify (t1, t2))
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	else
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          List.iter2 unify tlist1 tlist2
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    | Tclock _, Tstatic _
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    | Tstatic _, Tclock _ -> raise (Unify (t1, t2))
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    | Tclock t1', _ -> unify t1' t2
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    | _, Tclock t2' -> unify t1 t2'
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    | Tint, Tint | Tbool, Tbool | Trat, Trat
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    | Tunivar, _ | _, Tunivar -> ()
176
    | (Tconst t, _) ->
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      let def_t = get_type_definition t in
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      unify def_t t2
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    | (_, Tconst t)  ->
180
      let def_t = get_type_definition t in
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      unify t1 def_t
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    | Tenum tl, Tenum tl' when tl == tl' -> ()
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    | Tstatic (e1, t1'), Tstatic (e2, t2')
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    | Tarray (e1, t1'), Tarray (e2, t2') ->
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      begin
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	unify t1' t2';
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	Dimension.eval Basic_library.eval_env (fun c -> None) e1;
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	Dimension.eval Basic_library.eval_env (fun c -> None) e2;
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	Dimension.unify e1 e2;
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      end
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    | _,_ -> raise (Unify (t1, t2))
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(** [semi_unify t1 t2] checks whether type [t1] is an instance of type [t2]. Raises [Unify
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    (t1,t2)] if the types are not semi-unifiable.*)
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(* Standard destructive semi-unification *)
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let rec semi_unify t1 t2 =
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  let t1 = repr t1 in
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  let t2 = repr t2 in
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  if t1=t2 then
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    ()
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  else
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    (* No type abbreviations resolution for now *)
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    match t1.tdesc,t2.tdesc with
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      (* This case is not mandory but will keep "older" types *)
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    | Tvar, Tvar ->
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        if t1.tid < t2.tid then
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          t2.tdesc <- Tlink t1
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        else
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          t1.tdesc <- Tlink t2
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    | (Tvar, _) -> raise (Unify (t1, t2))
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    | (_,Tvar) when (not (occurs t2 t1)) ->
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        t2.tdesc <- Tlink t1
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    | Tarrow (t1,t2), Tarrow (t1',t2') ->
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      begin
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        unify t1 t1';
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	unify t2 t2'
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      end
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    | Ttuple tlist1, Ttuple tlist2 ->
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        if (List.length tlist1) <> (List.length tlist2) then
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	  raise (Unify (t1, t2))
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	else
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          List.iter2 semi_unify tlist1 tlist2
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    | Tclock _, Tstatic _
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    | Tstatic _, Tclock _ -> raise (Unify (t1, t2))
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    | Tclock t1', _ -> semi_unify t1' t2
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    | _, Tclock t2' -> semi_unify t1 t2'
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    | Tint, Tint | Tbool, Tbool | Trat, Trat
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    | Tunivar, _ | _, Tunivar -> ()
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    | (Tconst t, _) ->
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      let def_t = get_type_definition t in
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      semi_unify def_t t2
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    | (_, Tconst t)  ->
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      let def_t = get_type_definition t in
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      semi_unify t1 def_t
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    | Tenum tl, Tenum tl' when tl == tl' -> ()
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    | Tstatic (e1, t1'), Tstatic (e2, t2')
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    | Tarray (e1, t1'), Tarray (e2, t2') ->
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      begin
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	semi_unify t1' t2';
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	Dimension.eval Basic_library.eval_env (fun c -> None) e1;
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	Dimension.eval Basic_library.eval_env (fun c -> None) e2;
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	Dimension.semi_unify e1 e2;
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      end
244
    | _,_ -> raise (Unify (t1, t2))
245

    
246
let try_unify ty1 ty2 loc =
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  try
248
    unify ty1 ty2
249
  with
250
  | Unify _ ->
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    raise (Error (loc, Type_clash (ty1,ty2)))
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  | Dimension.Unify _ ->
253
    raise (Error (loc, Type_clash (ty1,ty2)))
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255
let rec type_const loc c = 
256
  match c with
257
  | Const_int _ -> Type_predef.type_int
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  | Const_real _ -> Type_predef.type_real
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  | Const_float _ -> Type_predef.type_real
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  | Const_array ca -> let d = Dimension.mkdim_int loc (List.length ca) in
261
		      let ty = new_var () in
262
		      List.iter (fun e -> try_unify (type_const loc e) ty loc) ca;
263
		      Type_predef.type_array d ty
264
  | Const_tag t  ->
265
    if Hashtbl.mem tag_table t
266
    then type_coretype (fun d -> ()) (Hashtbl.find tag_table t)
267
    else raise (Error (loc, Unbound_value ("enum tag " ^ t)))
268

    
269
(* The following typing functions take as parameter an environment [env]
270
   and whether the element being typed is expected to be constant [const]. 
271
   [env] is a pair composed of:
272
  - a map from ident to type, associating to each ident, i.e. 
273
    variables, constants and (imported) nodes, its type including whether
274
    it is constant or not. This latter information helps in checking constant 
275
    propagation policy in Lustre.
276
  - a vdecl list, in order to modify types of declared variables that are
277
    later discovered to be clocks during the typing process.
278
*)
279
let check_constant loc const_expected const_real =
280
  if const_expected && not const_real
281
  then raise (Error (loc, Not_a_constant))
282

    
283
let rec type_standard_args env in_main const expr_list =
284
  let ty_list = List.map (fun e -> dynamic_type (type_expr env in_main const e)) expr_list in
285
  let ty_res = new_var () in
286
  List.iter2 (fun e ty -> try_unify ty_res ty e.expr_loc) expr_list ty_list;
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  ty_res
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289
(* emulates a subtyping relation between types t and (d : t),
290
   used during node applications and assignments *)
291
and type_subtyping_arg env in_main ?(sub=true) const real_arg formal_type =
292
  let loc = real_arg.expr_loc in
293
  let const = const || (Types.get_static_value formal_type <> None) in
294
  let real_type = type_expr env in_main const real_arg in
295
  let real_type =
296
    if const
297
    then let d =
298
	   if is_dimension_type real_type
299
	   then dimension_of_expr real_arg
300
	   else Dimension.mkdim_var () in
301
	 let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in
302
	 Dimension.eval Basic_library.eval_env eval_const d;
303
	 let real_static_type = Type_predef.type_static d (Types.dynamic_type real_type) in
304
	 (match Types.get_static_value real_type with
305
	 | None    -> ()
306
	 | Some d' -> try_unify real_type real_static_type loc);
307
	 real_static_type
308
    else real_type in
309
(*Format.eprintf "subtyping const %B real %a:%a vs formal %a@." const Printers.pp_expr real_arg Types.print_ty real_type Types.print_ty formal_type;*)
310
  match (repr real_type).tdesc, (repr formal_type).tdesc with
311
  | Tstatic _          , Tstatic _ when sub -> try_unify formal_type real_type loc
312
  | Tstatic (r_d, r_ty), _         when sub -> try_unify formal_type r_ty loc
313
  | _                                       -> try_unify formal_type real_type loc
314

    
315
and type_ident env in_main loc const id =
316
  type_expr env in_main const (expr_of_ident id loc)
317

    
318
(* typing an application implies:
319
   - checking that const formal parameters match real const (maybe symbolic) arguments
320
   - checking type adequation between formal and real arguments
321
*)
322
and type_appl env in_main loc const f args =
323
  let tfun = type_ident env in_main loc const f in
324
  let tins, touts = split_arrow tfun in
325
  let tins = type_list_of_type tins in
326
  let args = expr_list_of_expr args in
327
  List.iter2 (type_subtyping_arg env in_main const) args tins;
328
  touts
329

    
330
(** [type_expr env in_main expr] types expression [expr] in environment
331
    [env], expecting it to be [const] or not. *)
332
and type_expr env in_main const expr =
333
  let res = 
334
  match expr.expr_desc with
335
  | Expr_const c ->
336
    let ty = type_const expr.expr_loc c in
337
    let ty = Type_predef.type_static (Dimension.mkdim_var ()) ty in
338
    expr.expr_type <- ty;
339
    ty
340
  | Expr_ident v ->
341
    let tyv =
342
      try
343
        Env.lookup_value (fst env) v
344
      with Not_found ->
345
	Format.eprintf "Failure in typing expr %a@." Printers.pp_expr expr;
346
        raise (Error (expr.expr_loc, Unbound_value ("identifier " ^ v)))
347
    in
348
    let ty = instantiate (ref []) (ref []) tyv in
349
    let ty' =
350
      if const
351
      then Type_predef.type_static (Dimension.mkdim_var ()) (new_var ())
352
      else new_var () in
353
    try_unify ty ty' expr.expr_loc;
354
    expr.expr_type <- ty;
355
    ty 
356
  | Expr_array elist ->
357
    let ty_elt = type_standard_args env in_main const elist in
358
    let d = Dimension.mkdim_int expr.expr_loc (List.length elist) in
359
    let ty = Type_predef.type_array d ty_elt in
360
    expr.expr_type <- ty;
361
    ty
362
  | Expr_access (e1, d) ->
363
    type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int;
364
    let ty_elt = new_var () in
365
    let d = Dimension.mkdim_var () in
366
    type_subtyping_arg env in_main const e1 (Type_predef.type_array d ty_elt);
367
    expr.expr_type <- ty_elt;
368
    ty_elt
369
  | Expr_power (e1, d) ->
370
    let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in
371
    type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int;
372
    Dimension.eval Basic_library.eval_env eval_const d;
373
    let ty_elt = type_standard_args env in_main const [e1] in
374
    let ty = Type_predef.type_array d ty_elt in
375
    expr.expr_type <- ty;
376
    ty
377
  | Expr_tuple elist ->
378
    let ty = new_ty (Ttuple (List.map (type_expr env in_main const) elist)) in
379
    expr.expr_type <- ty;
380
    ty
381
  | Expr_ite (c, t, e) ->
382
    type_subtyping_arg env in_main const c Type_predef.type_bool;
383
    let ty = type_standard_args env in_main const [t; e] in
384
    expr.expr_type <- ty;
385
    ty
386
  | Expr_appl (id, args, r) ->
387
    (* application of non internal function is not legal in a constant
388
       expression *)
389
    (match r with
390
    | None        -> ()
391
    | Some (x, l) -> 
392
      check_constant expr.expr_loc const false;
393
      let expr_x = expr_of_ident x expr.expr_loc in	
394
      let typ_l = 
395
	Type_predef.type_clock 
396
	  (type_const expr.expr_loc (Const_tag l)) in
397
      type_subtyping_arg env in_main ~sub:false const expr_x typ_l);
398
    let touts = type_appl env in_main expr.expr_loc const id args in
399
    expr.expr_type <- touts;
400
    touts
401
  | Expr_fby (e1,e2)
402
  | Expr_arrow (e1,e2) ->
403
    (* fby/arrow is not legal in a constant expression *)
404
    check_constant expr.expr_loc const false;
405
    let ty = type_standard_args env in_main const [e1; e2] in
406
    expr.expr_type <- ty;
407
    ty
408
  | Expr_pre e ->
409
    (* pre is not legal in a constant expression *)
410
    check_constant expr.expr_loc const false;
411
    let ty = type_standard_args env in_main const [e] in
412
    expr.expr_type <- ty;
413
    ty
414
  | Expr_when (e1,c,l) ->
415
    (* when is not legal in a constant expression *)
416
    check_constant expr.expr_loc const false;
417
    let typ_l = Type_predef.type_clock (type_const expr.expr_loc (Const_tag l)) in
418
    let expr_c = expr_of_ident c expr.expr_loc in
419
    type_subtyping_arg env in_main ~sub:false const expr_c typ_l;
420
    update_clock env in_main c expr.expr_loc typ_l;
421
    let ty = type_standard_args env in_main const [e1] in
422
    expr.expr_type <- ty;
423
    ty
424
  | Expr_merge (c,hl) ->
425
    (* merge is not legal in a constant expression *)
426
    check_constant expr.expr_loc const false;
427
    let typ_in, typ_out = type_branches env in_main expr.expr_loc const hl in
428
    let expr_c = expr_of_ident c expr.expr_loc in
429
    let typ_l = Type_predef.type_clock typ_in in
430
    type_subtyping_arg env in_main ~sub:false const expr_c typ_l;
431
    update_clock env in_main c expr.expr_loc typ_l;
432
    expr.expr_type <- typ_out;
433
    typ_out
434
  | Expr_uclock (e,k) | Expr_dclock (e,k) ->
435
      let ty = type_expr env in_main const e in
436
      expr.expr_type <- ty;
437
      ty
438
  | Expr_phclock (e,q) ->
439
      let ty = type_expr env in_main const e in
440
      expr.expr_type <- ty;
441
      ty
442
  in (*Format.eprintf "typing %B %a at %a = %a@." const Printers.pp_expr expr Location.pp_loc expr.expr_loc Types.print_ty res;*) res
443

    
444
and type_branches env in_main loc const hl =
445
  let typ_in = new_var () in
446
  let typ_out = new_var () in
447
  try
448
    let used_labels =
449
      List.fold_left (fun accu (t, h) ->
450
	unify typ_in (type_const loc (Const_tag t));
451
	type_subtyping_arg env in_main const h typ_out;
452
	if List.mem t accu
453
	then raise (Error (loc, Already_bound t))
454
	else t :: accu) [] hl in
455
    let type_labels = get_enum_type_tags (coretype_type typ_in) in
456
    if List.sort compare used_labels <> List.sort compare type_labels
457
    then let unbound_tag = List.find (fun t -> not (List.mem t used_labels)) type_labels in
458
	 raise (Error (loc, Unbound_value ("branching tag " ^ unbound_tag)))
459
    else (typ_in, typ_out)
460
  with Unify (t1, t2) ->
461
    raise (Error (loc, Type_clash (t1,t2)))
462

    
463
and update_clock env in_main id loc typ =
464
 (*Log.report ~level:1 (fun fmt -> Format.fprintf fmt "update_clock %s with %a@ " id print_ty typ);*)
465
 try
466
   let vdecl = List.find (fun v -> v.var_id = id) (snd env)
467
   in vdecl.var_type <- typ
468
 with
469
   Not_found ->
470
   raise (Error (loc, Unbound_value ("clock " ^ id)))
471

    
472
(** [type_eq env eq] types equation [eq] in environment [env] *)
473
let type_eq env in_main undefined_vars eq =
474
  (* Check undefined variables, type lhs *)
475
  let expr_lhs = expr_of_expr_list eq.eq_loc (List.map (fun v -> expr_of_ident v eq.eq_loc) eq.eq_lhs) in
476
  let ty_lhs = type_expr env in_main false expr_lhs in
477
  (* Check multiple variable definitions *)
478
  let define_var id uvars =
479
    try
480
      ignore(IMap.find id uvars);
481
      IMap.remove id uvars
482
    with Not_found ->
483
      raise (Error (eq.eq_loc, Already_defined id))
484
  in
485
  let undefined_vars =
486
    List.fold_left (fun uvars v -> define_var v uvars) undefined_vars eq.eq_lhs in
487
  (* Type rhs wrt to lhs type with subtyping, i.e. a constant rhs value may be assigned
488
     to a (always non-constant) lhs variable *)
489
  let tins = type_list_of_type ty_lhs in
490
  let args = expr_list_of_expr eq.eq_rhs in
491
  List.iter2 (type_subtyping_arg env in_main false) args tins;
492
  undefined_vars
493

    
494

    
495
(* [type_coreclock env ck id loc] types the type clock declaration [ck]
496
   in environment [env] *)
497
let type_coreclock env ck id loc =
498
  match ck.ck_dec_desc with
499
  | Ckdec_any | Ckdec_pclock (_,_) -> ()
500
  | Ckdec_bool cl ->
501
      let dummy_id_expr = expr_of_ident id loc in
502
      let when_expr =
503
        List.fold_left
504
          (fun expr (x, l) ->
505
                {expr_tag = new_tag ();
506
                 expr_desc= Expr_when (expr,x,l);
507
                 expr_type = new_var ();
508
                 expr_clock = Clocks.new_var true;
509
                 expr_delay = Delay.new_var ();
510
                 expr_loc=loc;
511
		 expr_annot = None})
512
          dummy_id_expr cl
513
      in
514
Format.eprintf "yiihii@.";
515
      ignore (type_expr env false false when_expr)
516

    
517
let rec check_type_declaration loc cty =
518
 match cty with
519
 | Tydec_clock ty
520
 | Tydec_array (_, ty) -> check_type_declaration loc ty
521
 | Tydec_const tname   ->
522
   if not (Hashtbl.mem type_table cty)
523
   then raise (Error (loc, Unbound_type tname));
524
 | _                   -> ()
525

    
526
let type_var_decl vd_env env vdecl =
527
  check_type_declaration vdecl.var_loc vdecl.var_dec_type.ty_dec_desc;
528
  let eval_const id = Types.get_static_value (Env.lookup_value env id) in
529
  let type_dim d =
530
    begin
531
      type_subtyping_arg (env, vd_env) false true (expr_of_dimension d) Type_predef.type_int;
532
      Dimension.eval Basic_library.eval_env eval_const d;
533
    end in
534
  let ty = type_coretype type_dim vdecl.var_dec_type.ty_dec_desc in
535
  let ty_status =
536
    if vdecl.var_dec_const
537
    then Type_predef.type_static (Dimension.mkdim_var ()) ty
538
    else ty in
539
  let new_env = Env.add_value env vdecl.var_id ty_status in
540
  type_coreclock (new_env,vd_env) vdecl.var_dec_clock vdecl.var_id vdecl.var_loc;
541
  vdecl.var_type <- ty_status;
542
  new_env
543

    
544
let type_var_decl_list vd_env env l =
545
  List.fold_left (type_var_decl vd_env) env l
546

    
547
let type_of_vlist vars =
548
  let tyl = List.map (fun v -> v.var_type) vars in
549
  type_of_type_list tyl
550

    
551
let add_vdecl vd_env vdecl =
552
 if List.exists (fun v -> v.var_id = vdecl.var_id) vd_env
553
 then raise (Error (vdecl.var_loc, Already_bound vdecl.var_id))
554
 else vdecl::vd_env
555

    
556
let check_vd_env vd_env =
557
  ignore (List.fold_left add_vdecl [] vd_env)
558

    
559
(** [type_node env nd loc] types node [nd] in environment env. The
560
    location is used for error reports. *)
561
let type_node env nd loc =
562
  let is_main = nd.node_id = !Options.main_node in
563
  let vd_env_ol = nd.node_outputs@nd.node_locals in
564
  let vd_env =  nd.node_inputs@vd_env_ol in
565
  check_vd_env vd_env;
566
  let init_env = env in
567
  let delta_env = type_var_decl_list vd_env init_env nd.node_inputs in
568
  let delta_env = type_var_decl_list vd_env delta_env nd.node_outputs in
569
  let delta_env = type_var_decl_list vd_env delta_env nd.node_locals in
570
  let new_env = Env.overwrite env delta_env in
571
  let undefined_vars_init =
572
    List.fold_left
573
      (fun uvs v -> IMap.add v.var_id () uvs)
574
      IMap.empty vd_env_ol in
575
  let undefined_vars =
576
    List.fold_left (type_eq (new_env, vd_env) is_main) undefined_vars_init nd.node_eqs
577
  in
578
  (* check that table is empty *)
579
  if (not (IMap.is_empty undefined_vars)) then
580
    raise (Error (loc, Undefined_var undefined_vars));
581
  let ty_ins = type_of_vlist nd.node_inputs in
582
  let ty_outs = type_of_vlist nd.node_outputs in
583
  let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in
584
  generalize ty_node;
585
  (* TODO ? Check that no node in the hierarchy remains polymorphic ? *)
586
  nd.node_type <- ty_node;
587
  Env.add_value env nd.node_id ty_node
588

    
589
let type_imported_node env nd loc =
590
  let new_env = type_var_decl_list nd.nodei_inputs env nd.nodei_inputs in
591
  let vd_env = nd.nodei_inputs@nd.nodei_outputs in
592
  check_vd_env vd_env;
593
  ignore(type_var_decl_list vd_env new_env nd.nodei_outputs);
594
  let ty_ins = type_of_vlist nd.nodei_inputs in
595
  let ty_outs = type_of_vlist nd.nodei_outputs in
596
  let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in
597
  generalize ty_node;
598
(*
599
  if (is_polymorphic ty_node) then
600
    raise (Error (loc, Poly_imported_node nd.nodei_id));
601
*)
602
  let new_env = Env.add_value env nd.nodei_id ty_node in
603
  nd.nodei_type <- ty_node;
604
  new_env
605

    
606
let type_imported_fun env nd loc =
607
  let new_env = type_var_decl_list nd.fun_inputs env nd.fun_inputs in
608
  let vd_env =  nd.fun_inputs@nd.fun_outputs in
609
  check_vd_env vd_env;
610
  ignore(type_var_decl_list vd_env new_env nd.fun_outputs);
611
  let ty_ins = type_of_vlist nd.fun_inputs in
612
  let ty_outs = type_of_vlist nd.fun_outputs in
613
  let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in
614
  generalize ty_node;
615
(*
616
  if (is_polymorphic ty_node) then
617
    raise (Error (loc, Poly_imported_node nd.fun_id));
618
*)
619
  let new_env = Env.add_value env nd.fun_id ty_node in
620
  nd.fun_type <- ty_node;
621
  new_env
622

    
623
let type_top_consts env clist =
624
  List.fold_left (fun env cdecl ->
625
    let ty = type_const cdecl.const_loc cdecl.const_value in
626
    let d =
627
      if is_dimension_type ty
628
      then dimension_of_const cdecl.const_loc cdecl.const_value
629
      else Dimension.mkdim_var () in
630
    let ty = Type_predef.type_static d ty in
631
    let new_env = Env.add_value env cdecl.const_id ty in
632
    cdecl.const_type <- ty;
633
    new_env) env clist
634

    
635
let type_top_decl env decl =
636
  match decl.top_decl_desc with
637
  | Node nd -> (
638
      try
639
	type_node env nd decl.top_decl_loc
640
      with Error (loc, err) as exc -> (
641
	if !Options.global_inline then
642
	  Format.eprintf "Type error: failing node@.%a@.@?"
643
	    Printers.pp_node nd
644
	;
645
	raise exc)
646
  )
647
  | ImportedNode nd ->
648
      type_imported_node env nd decl.top_decl_loc
649
  | ImportedFun nd ->
650
      type_imported_fun env nd decl.top_decl_loc
651
  | Consts clist ->
652
      type_top_consts env clist
653
  | Open _  -> env
654

    
655
let type_prog env decls =
656
try
657
  List.fold_left type_top_decl env decls
658
with Failure _ as exc -> raise exc
659

    
660
(* Once the Lustre program is fully typed,
661
   we must get back to the original description of dimensions,
662
   with constant parameters, instead of unifiable internal variables. *)
663

    
664
(* The following functions aims at 'unevaluating' dimension expressions occuring in array types,
665
   i.e. replacing unifiable second_order variables with the original static parameters.
666
   Once restored in this formulation, dimensions may be meaningfully printed.
667
*)
668
(*
669
let uneval_vdecl_generics vdecl ty =
670
 if vdecl.var_dec_const
671
 then
672
   match get_static_value ty with
673
   | None   -> (Format.eprintf "internal error: %a@." Types.print_ty vdecl.var_type; assert false)
674
   | Some d -> Dimension.unify d (Dimension.mkdim_ident vdecl.var_loc vdecl.var_id)
675

    
676
let uneval_node_generics vdecls =
677
  let inst_typ_vars = ref [] in
678
  let inst_dim_vars = ref [] in
679
  let inst_ty_list = List.map (fun v -> instantiate inst_typ_vars inst_dim_vars v.var_type) vdecls in
680
  List.iter2 (fun v ty -> uneval_vdecl_generics v ty) vdecls inst_ty_list;
681
  List.iter2 (fun v ty -> generalize ty; v.var_type <- ty) vdecls inst_ty_list
682
*)
683
let uneval_vdecl_generics vdecl =
684
 if vdecl.var_dec_const
685
 then
686
   match get_static_value vdecl.var_type with
687
   | None   -> (Format.eprintf "internal error: %a@." Types.print_ty vdecl.var_type; assert false)
688
   | Some d -> Dimension.uneval vdecl.var_id d
689

    
690
let uneval_node_generics vdecls =
691
  List.iter uneval_vdecl_generics vdecls
692

    
693
let uneval_top_generics decl =
694
  match decl.top_decl_desc with
695
  | Node nd ->
696
      uneval_node_generics (nd.node_inputs @ nd.node_outputs)
697
  | ImportedNode nd ->
698
      uneval_node_generics (nd.nodei_inputs @ nd.nodei_outputs)
699
  | ImportedFun nd ->
700
      ()
701
  | Consts clist -> ()
702
  | Open _  -> ()
703

    
704
let uneval_prog_generics prog =
705
 List.iter uneval_top_generics prog
706

    
707
let check_env_compat declared computed =
708
  Env.iter declared (fun k decl_type_k -> 
709
    let computed_t = Env.lookup_value computed k in
710
    try_unify decl_type_k computed_t Location.dummy_loc
711
  ) 
712

    
713
(* Local Variables: *)
714
(* compile-command:"make -C .." *)
715
(* End: *)