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(********************************************************************)
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(*                                                                  *)
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(*  The LustreC compiler toolset   /  The LustreC Development Team  *)
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(*  Copyright 2012 -    --   ONERA - CNRS - INPT - LIFL             *)
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(*                                                                  *)
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(*  LustreC is free software, distributed WITHOUT ANY WARRANTY      *)
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(*  under the terms of the GNU Lesser General Public License        *)
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(*  version 2.1.                                                    *)
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(*                                                                  *) 
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(*  This file was originally from the Prelude compiler              *)
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(*                                                                  *) 
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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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  | Tstruct fl ->
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     List.exists (fun (f, t) -> occurs tvar t) fl
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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 tl ->
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     List.iter generalize tl
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  | Tstruct fl ->
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     List.iter (fun (f, t) -> generalize t) fl
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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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  | Tstruct flist ->
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      {ty with tdesc = Tstruct (List.map (fun (f, t) -> (f, instantiate inst_vars inst_dim_vars t)) flist)}
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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_struct fl -> Type_predef.type_struct (List.map (fun (f, ty) -> (f, type_coretype type_dim ty)) fl)
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  | Tydec_array (d, ty) ->
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    begin
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      let d = Dimension.copy (ref []) d in
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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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 | Tstruct fl     -> Tydec_struct (List.map (fun (f, t) -> (f, coretype_type t)) fl)
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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_coretype_definition tname =
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  try
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    let top = Hashtbl.find type_table (Tydec_const tname) in
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    match top.top_decl_desc with
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    | TypeDef tdef -> tdef.tydef_desc
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    | _ -> assert false
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  with Not_found -> raise (Error (Location.dummy_loc, Unbound_type tname))
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let get_type_definition tname =
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    type_coretype (fun d -> ()) (get_coretype_definition tname)
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(* Equality on ground types only *)
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(* Should be used between local variables which must have a ground type *)
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let rec eq_ground t1 t2 =
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  let t1 = repr t1 in
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  let t2 = repr t2 in
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  t1==t2 ||
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  match t1.tdesc, t2.tdesc with
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  | Tint, Tint | Tbool, Tbool | Trat, Trat | Treal, Treal -> true
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  | Tenum tl, Tenum tl' when tl == tl' -> true
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  | Ttuple tl, Ttuple tl' when List.length tl = List.length tl' -> List.for_all2 eq_ground tl tl'
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  | Tstruct fl, Tstruct fl' when List.map fst fl = List.map fst fl' -> List.for_all2 (fun (_, t) (_, t') -> eq_ground t t') fl fl'
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  | (Tconst t, _) ->
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    let def_t = get_type_definition t in
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    eq_ground 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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    eq_ground t1 def_t
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  | Tarrow (t1,t2), Tarrow (t1',t2') -> eq_ground t1 t1' && eq_ground t2 t2'
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  | Tclock t1', Tclock t2' -> eq_ground t1' t2'
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  | Tstatic (e1, t1'), Tstatic (e2, t2')
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  | Tarray (e1, t1'), Tarray (e2, t2') -> Dimension.is_eq_dimension e1 e2 && eq_ground t1' t2'
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  | _ -> false
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(** [unify t1 t2] unifies types [t1] and [t2]
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    using standard destructive unification.
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    Raises [Unify (t1,t2)] if the types are not unifiable.
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    [t1] is a expected/formal/spec type, [t2] is a computed/real/implem type,
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    so in case of unification error: expected type [t1], got type [t2].
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    If [sub]-typing is allowed, [t2] may be a subtype of [t1].
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    If [semi] unification is required,
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    [t1] should furthermore be an instance of [t2]
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    and constants are handled differently.*)
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let unify ?(sub=false) ?(semi=false) t1 t2 =
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  let rec unif 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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      match t1.tdesc,t2.tdesc with
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      (* strictly subtyping cases first *)
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      | _ , Tclock t2 when sub && (get_clock_base_type t1 = None) ->
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	unif t1 t2
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      | _ , Tstatic (d2, t2) when sub && (get_static_value t1 = None) ->
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	unif t1 t2
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      (* This case is not mandatory 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 semi) && (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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          unif t2 t2';
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	  unif t1' t1
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	end
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      | Ttuple tl, Ttuple tl' when List.length tl = List.length tl' ->
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	List.iter2 unif tl tl'
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      | Ttuple [t1]        , _                  -> unif t1 t2
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      | _                  , Ttuple [t2]        -> unif t1 t2
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      | Tstruct fl, Tstruct fl' when List.map fst fl = List.map fst fl' ->
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	List.iter2 (fun (_, t) (_, t') -> unif t t') fl fl'
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      | Tclock _, Tstatic _
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      | Tstatic _, Tclock _ -> raise (Unify (t1, t2))
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      | Tclock t1', Tclock t2' -> unif t1' t2'
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      | Tint, Tint | Tbool, Tbool | Trat, Trat | Treal, Treal
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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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	unif 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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	unif 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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	let eval_const =
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	  if semi
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	  then (fun c -> Some (Dimension.mkdim_ident Location.dummy_loc c))
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	  else (fun c -> None) in
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	begin
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	  unif t1' t2';
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	  Dimension.eval Basic_library.eval_env eval_const e1;
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	  Dimension.eval Basic_library.eval_env eval_const e2;
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	  Dimension.unify ~semi:semi e1 e2;
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	end
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      | _,_ -> raise (Unify (t1, t2))
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  in unif t1 t2
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(* Expected type ty1, got type ty2 *)
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let try_unify ?(sub=false) ?(semi=false) ty1 ty2 loc =
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  try
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    unify ~sub:sub ~semi:semi ty1 ty2
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  with
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  | Unify _ ->
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    raise (Error (loc, Type_clash (ty1,ty2)))
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  | Dimension.Unify _ ->
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    raise (Error (loc, Type_clash (ty1,ty2)))
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let rec type_struct_const_field loc (label, c) =
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  if Hashtbl.mem field_table label
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  then let tydef = Hashtbl.find field_table label in
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       let tydec = (typedef_of_top tydef).tydef_desc in 
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       let tydec_struct = get_struct_type_fields tydec in
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       let ty_label = type_coretype (fun d -> ()) (List.assoc label tydec_struct) in
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       begin
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	 try_unify ty_label (type_const loc c) loc;
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	 type_coretype (fun d -> ()) tydec
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       end
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  else raise (Error (loc, Unbound_value ("struct field " ^ label)))
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and type_const loc c = 
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  match c with
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  | 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
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		      let ty = new_var () in
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		      List.iter (fun e -> try_unify ty (type_const loc e) loc) ca;
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		      Type_predef.type_array d ty
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  | Const_tag t     ->
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    if Hashtbl.mem tag_table t
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    then 
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      let tydef = typedef_of_top (Hashtbl.find tag_table t) in
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      let tydec =
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	if is_user_type tydef.tydef_desc
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	then Tydec_const tydef.tydef_id
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	else tydef.tydef_desc in
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      type_coretype (fun d -> ()) tydec
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    else raise (Error (loc, Unbound_value ("enum tag " ^ t)))
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  | Const_struct fl ->
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    let ty_struct = new_var () in
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    begin
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      let used =
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	List.fold_left
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	  (fun acc (l, c) ->
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	    if List.mem l acc
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	    then raise (Error (loc, Already_bound ("struct field " ^ l)))
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	    else try_unify ty_struct (type_struct_const_field loc (l, c)) loc; l::acc)
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	  [] fl in
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      try
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	let total = List.map fst (get_struct_type_fields (coretype_type ty_struct)) in
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(*	List.iter (fun l -> Format.eprintf "total: %s@." l) total;
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	List.iter (fun l -> Format.eprintf "used: %s@." l) used; *)
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	let undef = List.find (fun l -> not (List.mem l used)) total
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	in raise (Error (loc, Unbound_value ("struct field " ^ undef)))
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      with Not_found -> 
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	ty_struct
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    end
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  | Const_string _ -> assert false (* string should only appear in annotations *)
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(* The following typing functions take as parameter an environment [env]
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   and whether the element being typed is expected to be constant [const]. 
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   [env] is a pair composed of:
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  - a map from ident to type, associating to each ident, i.e. 
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    variables, constants and (imported) nodes, its type including whether
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    it is constant or not. This latter information helps in checking constant 
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    propagation policy in Lustre.
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  - a vdecl list, in order to modify types of declared variables that are
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    later discovered to be clocks during the typing process.
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*)
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let check_constant loc const_expected const_real =
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  if const_expected && not const_real
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  then raise (Error (loc, Not_a_constant))
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let rec type_add_const env const arg targ =
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(*Format.eprintf "Typing.type_add_const %a %a@." Printers.pp_expr arg Types.print_ty targ;*)
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  if const
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  then let d =
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	 if is_dimension_type targ
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	 then dimension_of_expr arg
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	 else Dimension.mkdim_var () in
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       let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in
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       Dimension.eval Basic_library.eval_env eval_const d;
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       let real_static_type = Type_predef.type_static d (Types.dynamic_type targ) in
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       (match Types.get_static_value targ with
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       | None    -> ()
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       | Some d' -> try_unify targ real_static_type arg.expr_loc);
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       real_static_type
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  else targ
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(* emulates a subtyping relation between types t and (d : t),
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   used during node applications and assignments *)
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and type_subtyping_arg env in_main ?(sub=true) const real_arg formal_type =
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  let loc = real_arg.expr_loc in
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  let const = const || (Types.get_static_value formal_type <> None) in
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  let real_type = type_add_const env const real_arg (type_expr env in_main const real_arg) in
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  (*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;*)
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  try_unify ~sub:sub formal_type real_type loc
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and type_ident env in_main loc const id =
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  type_expr env in_main const (expr_of_ident id loc)
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(* typing an application implies:
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   - checking that const formal parameters match real const (maybe symbolic) arguments
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   - checking type adequation between formal and real arguments
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   An application may embed an homomorphic/internal function, in which case we need to split
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   it in many calls
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*)
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and type_appl env in_main loc const f args =
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  let targs = List.map (type_expr env in_main const) args in
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  if Basic_library.is_internal_fun f && List.exists is_tuple_type targs
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  then
352
    try
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      let targs = Utils.transpose_list (List.map type_list_of_type targs) in
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      Types.type_of_type_list (List.map (type_simple_call env in_main loc const f) targs)
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    with
356
      Utils.TransposeError (l, l') -> raise (Error (loc, WrongMorphism (l, l')))
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  else
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    type_dependent_call env in_main loc const f (List.combine args targs)
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(* type a call with possible dependent types. [targs] is here a list of (argument, type) pairs. *)
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and type_dependent_call env in_main loc const f targs =
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(*Format.eprintf "Typing.type_dependent_call %s@." f;*)
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  let tins, touts = new_var (), new_var () in
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  let tfun = Type_predef.type_arrow tins touts in
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  type_subtyping_arg env in_main const (expr_of_ident f loc) tfun;
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  let tins = type_list_of_type tins in
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  if List.length targs <> List.length tins then
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    raise (Error (loc, WrongArity (List.length tins, List.length targs)))
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  else
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    begin
371
      List.iter2 (fun (a,t) ti ->
372
	let t' = type_add_const env (const || Types.get_static_value ti <> None) a t
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	in try_unify ~sub:true ti t' a.expr_loc;
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      ) targs tins;
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(*Format.eprintf "Typing.type_dependent_call END@.";*)
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      touts;
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    end
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(* type a simple call without dependent types 
380
   but possible homomorphic extension.
381
   [targs] is here a list of arguments' types. *)
382
and type_simple_call env in_main loc const f targs =
383
  let tins, touts = new_var (), new_var () in
384
  let tfun = Type_predef.type_arrow tins touts in
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  type_subtyping_arg env in_main const (expr_of_ident f loc) tfun;
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  (*Format.eprintf "try unify %a %a@." Types.print_ty tins Types.print_ty (type_of_type_list targs);*)
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  try_unify ~sub:true tins (type_of_type_list targs) loc;
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  touts
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(** [type_expr env in_main expr] types expression [expr] in environment
391
    [env], expecting it to be [const] or not. *)
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and type_expr env in_main const expr =
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  let resulting_ty = 
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  match expr.expr_desc with
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  | Expr_const c ->
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    let ty = type_const expr.expr_loc c in
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    let ty = Type_predef.type_static (Dimension.mkdim_var ()) ty in
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    expr.expr_type <- ty;
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    ty
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  | Expr_ident v ->
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    let tyv =
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      try
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        Env.lookup_value (fst env) v
404
      with Not_found ->
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	Format.eprintf "Failure in typing expr %a@." Printers.pp_expr expr;
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        raise (Error (expr.expr_loc, Unbound_value ("identifier " ^ v)))
407
    in
408
    let ty = instantiate (ref []) (ref []) tyv in
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    let ty' =
410
      if const
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      then Type_predef.type_static (Dimension.mkdim_var ()) (new_var ())
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      else new_var () in
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    try_unify ty ty' expr.expr_loc;
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    expr.expr_type <- ty;
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    ty 
416
  | Expr_array elist ->
417 2cf39a8e xthirioux
    let ty_elt = new_var () in
418
    List.iter (fun e -> try_unify ty_elt (type_appl env in_main expr.expr_loc const "uminus" [e]) e.expr_loc) elist;
419 0cbf0839 ploc
    let d = Dimension.mkdim_int expr.expr_loc (List.length elist) in
420
    let ty = Type_predef.type_array d ty_elt in
421
    expr.expr_type <- ty;
422
    ty
423
  | Expr_access (e1, d) ->
424
    type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int;
425
    let ty_elt = new_var () in
426
    let d = Dimension.mkdim_var () in
427
    type_subtyping_arg env in_main const e1 (Type_predef.type_array d ty_elt);
428
    expr.expr_type <- ty_elt;
429
    ty_elt
430
  | Expr_power (e1, d) ->
431
    let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in
432
    type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int;
433
    Dimension.eval Basic_library.eval_env eval_const d;
434 2cf39a8e xthirioux
    let ty_elt = type_appl env in_main expr.expr_loc const "uminus" [e1] in
435 0cbf0839 ploc
    let ty = Type_predef.type_array d ty_elt in
436
    expr.expr_type <- ty;
437
    ty
438
  | Expr_tuple elist ->
439
    let ty = new_ty (Ttuple (List.map (type_expr env in_main const) elist)) in
440
    expr.expr_type <- ty;
441
    ty
442
  | Expr_ite (c, t, e) ->
443
    type_subtyping_arg env in_main const c Type_predef.type_bool;
444 2cf39a8e xthirioux
    let ty = type_appl env in_main expr.expr_loc const "+" [t; e] in
445 0cbf0839 ploc
    expr.expr_type <- ty;
446
    ty
447
  | Expr_appl (id, args, r) ->
448 f22632aa ploc
    (* application of non internal function is not legal in a constant
449
       expression *)
450 0cbf0839 ploc
    (match r with
451
    | None        -> ()
452 6a1a01d2 xthirioux
    | Some c -> 
453
      check_constant expr.expr_loc const false;	
454
      type_subtyping_arg env in_main const c Type_predef.type_bool);
455 2cf39a8e xthirioux
    let touts = type_appl env in_main expr.expr_loc const id (expr_list_of_expr args) in
456 0cbf0839 ploc
    expr.expr_type <- touts;
457
    touts
458
  | Expr_fby (e1,e2)
459
  | Expr_arrow (e1,e2) ->
460
    (* fby/arrow is not legal in a constant expression *)
461
    check_constant expr.expr_loc const false;
462 2cf39a8e xthirioux
    let ty = type_appl env in_main expr.expr_loc const "+" [e1; e2] in
463 0cbf0839 ploc
    expr.expr_type <- ty;
464
    ty
465
  | Expr_pre e ->
466
    (* pre is not legal in a constant expression *)
467
    check_constant expr.expr_loc const false;
468 2cf39a8e xthirioux
    let ty = type_appl env in_main expr.expr_loc const "uminus" [e] in
469 0cbf0839 ploc
    expr.expr_type <- ty;
470
    ty
471
  | Expr_when (e1,c,l) ->
472
    (* when is not legal in a constant expression *)
473
    check_constant expr.expr_loc const false;
474
    let typ_l = Type_predef.type_clock (type_const expr.expr_loc (Const_tag l)) in
475
    let expr_c = expr_of_ident c expr.expr_loc in
476
    type_subtyping_arg env in_main ~sub:false const expr_c typ_l;
477 2cf39a8e xthirioux
    let ty = type_appl env in_main expr.expr_loc const "uminus" [e1] in
478 0cbf0839 ploc
    expr.expr_type <- ty;
479
    ty
480
  | Expr_merge (c,hl) ->
481
    (* merge is not legal in a constant expression *)
482
    check_constant expr.expr_loc const false;
483
    let typ_in, typ_out = type_branches env in_main expr.expr_loc const hl in
484
    let expr_c = expr_of_ident c expr.expr_loc in
485
    let typ_l = Type_predef.type_clock typ_in in
486
    type_subtyping_arg env in_main ~sub:false const expr_c typ_l;
487
    expr.expr_type <- typ_out;
488
    typ_out
489 14d694c7 xthirioux
  in 
490
  Log.report ~level:3 (fun fmt -> Format.fprintf fmt "Type of expr %a: %a@." Printers.pp_expr expr Types.print_ty resulting_ty);
491
  resulting_ty
492 0cbf0839 ploc
493
and type_branches env in_main loc const hl =
494
  let typ_in = new_var () in
495
  let typ_out = new_var () in
496
  try
497
    let used_labels =
498
      List.fold_left (fun accu (t, h) ->
499
	unify typ_in (type_const loc (Const_tag t));
500
	type_subtyping_arg env in_main const h typ_out;
501
	if List.mem t accu
502
	then raise (Error (loc, Already_bound t))
503
	else t :: accu) [] hl in
504
    let type_labels = get_enum_type_tags (coretype_type typ_in) in
505
    if List.sort compare used_labels <> List.sort compare type_labels
506
    then let unbound_tag = List.find (fun t -> not (List.mem t used_labels)) type_labels in
507
	 raise (Error (loc, Unbound_value ("branching tag " ^ unbound_tag)))
508
    else (typ_in, typ_out)
509
  with Unify (t1, t2) ->
510
    raise (Error (loc, Type_clash (t1,t2)))
511 2cf39a8e xthirioux
512 0cbf0839 ploc
(** [type_eq env eq] types equation [eq] in environment [env] *)
513
let type_eq env in_main undefined_vars eq =
514 01d48bb0 xthirioux
(*Format.eprintf "Typing.type_eq %a@." Printers.pp_node_eq eq;*)
515 0cbf0839 ploc
  (* Check undefined variables, type lhs *)
516
  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
517
  let ty_lhs = type_expr env in_main false expr_lhs in
518
  (* Check multiple variable definitions *)
519
  let define_var id uvars =
520 01d48bb0 xthirioux
    if ISet.mem id uvars
521
    then ISet.remove id uvars
522
    else raise (Error (eq.eq_loc, Already_defined id))
523 0cbf0839 ploc
  in
524 6b4d172f xthirioux
  (* check assignment of declared constant, assignment of clock *)
525
  let ty_lhs =
526
    type_of_type_list
527
      (List.map2 (fun ty id ->
528
	if get_static_value ty <> None
529
	then raise (Error (eq.eq_loc, Assigned_constant id)) else
530
	match get_clock_base_type ty with
531
	| None -> ty
532
	| Some ty -> ty)
533
	 (type_list_of_type ty_lhs) eq.eq_lhs) in
534 0cbf0839 ploc
  let undefined_vars =
535
    List.fold_left (fun uvars v -> define_var v uvars) undefined_vars eq.eq_lhs in
536
  (* Type rhs wrt to lhs type with subtyping, i.e. a constant rhs value may be assigned
537
     to a (always non-constant) lhs variable *)
538 fbda2f96 xthirioux
  type_subtyping_arg env in_main false eq.eq_rhs ty_lhs;
539 0cbf0839 ploc
  undefined_vars
540
541
542
(* [type_coreclock env ck id loc] types the type clock declaration [ck]
543
   in environment [env] *)
544
let type_coreclock env ck id loc =
545
  match ck.ck_dec_desc with
546
  | Ckdec_any | Ckdec_pclock (_,_) -> ()
547
  | Ckdec_bool cl ->
548
      let dummy_id_expr = expr_of_ident id loc in
549
      let when_expr =
550
        List.fold_left
551
          (fun expr (x, l) ->
552
                {expr_tag = new_tag ();
553
                 expr_desc= Expr_when (expr,x,l);
554
                 expr_type = new_var ();
555
                 expr_clock = Clocks.new_var true;
556
                 expr_delay = Delay.new_var ();
557
                 expr_loc=loc;
558
		 expr_annot = None})
559
          dummy_id_expr cl
560
      in
561
      ignore (type_expr env false false when_expr)
562
563
let rec check_type_declaration loc cty =
564
 match cty with
565
 | Tydec_clock ty
566
 | Tydec_array (_, ty) -> check_type_declaration loc ty
567
 | Tydec_const tname   ->
568
   if not (Hashtbl.mem type_table cty)
569
   then raise (Error (loc, Unbound_type tname));
570
 | _                   -> ()
571
572
let type_var_decl vd_env env vdecl =
573 01d48bb0 xthirioux
(*Format.eprintf "Typing.type_var_decl START %a:%a@." Printers.pp_var vdecl Printers.print_dec_ty vdecl.var_dec_type.ty_dec_desc;*)
574 0cbf0839 ploc
  check_type_declaration vdecl.var_loc vdecl.var_dec_type.ty_dec_desc;
575
  let eval_const id = Types.get_static_value (Env.lookup_value env id) in
576
  let type_dim d =
577
    begin
578
      type_subtyping_arg (env, vd_env) false true (expr_of_dimension d) Type_predef.type_int;
579 01d48bb0 xthirioux
580 0cbf0839 ploc
      Dimension.eval Basic_library.eval_env eval_const d;
581
    end in
582
  let ty = type_coretype type_dim vdecl.var_dec_type.ty_dec_desc in
583 01d48bb0 xthirioux
584
  let ty_static =
585 0cbf0839 ploc
    if vdecl.var_dec_const
586 01d48bb0 xthirioux
    then  Type_predef.type_static (Dimension.mkdim_var ()) ty
587 0cbf0839 ploc
    else ty in
588 01d48bb0 xthirioux
  (match vdecl.var_dec_value with
589
  | None   -> ()
590
  | Some v -> type_subtyping_arg (env, vd_env) false ~sub:false true v ty_static);
591
  try_unify ty_static vdecl.var_type vdecl.var_loc;
592
  let new_env = Env.add_value env vdecl.var_id ty_static in
593 0cbf0839 ploc
  type_coreclock (new_env,vd_env) vdecl.var_dec_clock vdecl.var_id vdecl.var_loc;
594 01d48bb0 xthirioux
(*Format.eprintf "END %a@." Types.print_ty ty_static;*)
595 0cbf0839 ploc
  new_env
596
597
let type_var_decl_list vd_env env l =
598
  List.fold_left (type_var_decl vd_env) env l
599
600
let type_of_vlist vars =
601
  let tyl = List.map (fun v -> v.var_type) vars in
602
  type_of_type_list tyl
603
604
let add_vdecl vd_env vdecl =
605
 if List.exists (fun v -> v.var_id = vdecl.var_id) vd_env
606
 then raise (Error (vdecl.var_loc, Already_bound vdecl.var_id))
607
 else vdecl::vd_env
608
609
let check_vd_env vd_env =
610
  ignore (List.fold_left add_vdecl [] vd_env)
611
612
(** [type_node env nd loc] types node [nd] in environment env. The
613
    location is used for error reports. *)
614
let type_node env nd loc =
615
  let is_main = nd.node_id = !Options.main_node in
616
  let vd_env_ol = nd.node_outputs@nd.node_locals in
617
  let vd_env =  nd.node_inputs@vd_env_ol in
618
  check_vd_env vd_env;
619
  let init_env = env in
620
  let delta_env = type_var_decl_list vd_env init_env nd.node_inputs in
621
  let delta_env = type_var_decl_list vd_env delta_env nd.node_outputs in
622
  let delta_env = type_var_decl_list vd_env delta_env nd.node_locals in
623
  let new_env = Env.overwrite env delta_env in
624
  let undefined_vars_init =
625
    List.fold_left
626 01d48bb0 xthirioux
      (fun uvs v -> ISet.add v.var_id uvs)
627
      ISet.empty vd_env_ol in
628 0cbf0839 ploc
  let undefined_vars =
629 1eda3e78 xthirioux
    List.fold_left (type_eq (new_env, vd_env) is_main) undefined_vars_init (get_node_eqs nd)
630 0cbf0839 ploc
  in
631 36454535 ploc
  (* Typing asserts *)
632
  List.iter (fun assert_ ->
633
    let assert_expr =  assert_.assert_expr in
634
    type_subtyping_arg (new_env, vd_env) is_main false assert_expr Type_predef.type_bool
635
  )  nd.node_asserts;
636
  
637 0cbf0839 ploc
  (* check that table is empty *)
638 01d48bb0 xthirioux
  let local_consts = List.fold_left (fun res vdecl -> if vdecl.var_dec_const then ISet.add vdecl.var_id res else res) ISet.empty nd.node_locals in
639
  let undefined_vars = ISet.diff undefined_vars local_consts in
640
  if (not (ISet.is_empty undefined_vars)) then
641 0cbf0839 ploc
    raise (Error (loc, Undefined_var undefined_vars));
642
  let ty_ins = type_of_vlist nd.node_inputs in
643
  let ty_outs = type_of_vlist nd.node_outputs in
644
  let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in
645
  generalize ty_node;
646
  (* TODO ? Check that no node in the hierarchy remains polymorphic ? *)
647
  nd.node_type <- ty_node;
648
  Env.add_value env nd.node_id ty_node
649
650
let type_imported_node env nd loc =
651
  let new_env = type_var_decl_list nd.nodei_inputs env nd.nodei_inputs in
652
  let vd_env = nd.nodei_inputs@nd.nodei_outputs in
653
  check_vd_env vd_env;
654
  ignore(type_var_decl_list vd_env new_env nd.nodei_outputs);
655
  let ty_ins = type_of_vlist nd.nodei_inputs in
656
  let ty_outs = type_of_vlist nd.nodei_outputs in
657
  let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in
658
  generalize ty_node;
659
(*
660
  if (is_polymorphic ty_node) then
661
    raise (Error (loc, Poly_imported_node nd.nodei_id));
662
*)
663
  let new_env = Env.add_value env nd.nodei_id ty_node in
664
  nd.nodei_type <- ty_node;
665
  new_env
666
667 70e1006b xthirioux
let type_top_const env cdecl =
668
  let ty = type_const cdecl.const_loc cdecl.const_value in
669
  let d =
670
    if is_dimension_type ty
671
    then dimension_of_const cdecl.const_loc cdecl.const_value
672
    else Dimension.mkdim_var () in
673
  let ty = Type_predef.type_static d ty in
674
  let new_env = Env.add_value env cdecl.const_id ty in
675
  cdecl.const_type <- ty;
676
  new_env
677
678 0cbf0839 ploc
let type_top_consts env clist =
679 70e1006b xthirioux
  List.fold_left type_top_const env clist
680
681
let rec type_top_decl env decl =
682 0cbf0839 ploc
  match decl.top_decl_desc with
683 c02d255e ploc
  | Node nd -> (
684
      try
685
	type_node env nd decl.top_decl_loc
686
      with Error (loc, err) as exc -> (
687 01d48bb0 xthirioux
	(*if !Options.global_inline then
688 c02d255e ploc
	  Format.eprintf "Type error: failing node@.%a@.@?"
689
	    Printers.pp_node nd
690 01d48bb0 xthirioux
	;*)
691 c02d255e ploc
	raise exc)
692
  )
693 0cbf0839 ploc
  | ImportedNode nd ->
694
      type_imported_node env nd decl.top_decl_loc
695 70e1006b xthirioux
  | Const c ->
696
      type_top_const env c
697
  | TypeDef _ -> List.fold_left type_top_decl env (consts_of_enum_type decl)
698 f22632aa ploc
  | Open _  -> env
699 0cbf0839 ploc
700
let type_prog env decls =
701
try
702 f22632aa ploc
  List.fold_left type_top_decl env decls
703 0cbf0839 ploc
with Failure _ as exc -> raise exc
704
705
(* Once the Lustre program is fully typed,
706
   we must get back to the original description of dimensions,
707
   with constant parameters, instead of unifiable internal variables. *)
708
709
(* The following functions aims at 'unevaluating' dimension expressions occuring in array types,
710
   i.e. replacing unifiable second_order variables with the original static parameters.
711
   Once restored in this formulation, dimensions may be meaningfully printed.
712
*)
713
let uneval_vdecl_generics vdecl =
714
 if vdecl.var_dec_const
715
 then
716
   match get_static_value vdecl.var_type with
717
   | None   -> (Format.eprintf "internal error: %a@." Types.print_ty vdecl.var_type; assert false)
718
   | Some d -> Dimension.uneval vdecl.var_id d
719
720
let uneval_node_generics vdecls =
721
  List.iter uneval_vdecl_generics vdecls
722
723
let uneval_top_generics decl =
724
  match decl.top_decl_desc with
725
  | Node nd ->
726
      uneval_node_generics (nd.node_inputs @ nd.node_outputs)
727
  | ImportedNode nd ->
728
      uneval_node_generics (nd.nodei_inputs @ nd.nodei_outputs)
729 70e1006b xthirioux
  | Const _
730
  | TypeDef _
731 f22632aa ploc
  | Open _  -> ()
732 0cbf0839 ploc
733
let uneval_prog_generics prog =
734
 List.iter uneval_top_generics prog
735 f22632aa ploc
736 70e1006b xthirioux
let rec get_imported_symbol decls id =
737 0b78e972 xthirioux
  match decls with
738
  | [] -> assert false
739
  | decl::q ->
740
     (match decl.top_decl_desc with
741 70e1006b xthirioux
      | ImportedNode nd when id = nd.nodei_id && decl.top_decl_itf -> decl
742
      | Const c when id = c.const_id && decl.top_decl_itf -> decl
743
      | TypeDef _ -> get_imported_symbol (consts_of_enum_type decl @ q) id
744
      | _ -> get_imported_symbol q id)
745 0b78e972 xthirioux
746 c518d082 xthirioux
let check_env_compat header declared computed = 
747
  uneval_prog_generics header;
748 70e1006b xthirioux
  Env.iter declared (fun k decl_type_k ->
749
    let loc = (get_imported_symbol header k).top_decl_loc in 
750
    let computed_t =
751
      instantiate (ref []) (ref []) 
752
	(try Env.lookup_value computed k
753
	 with Not_found -> raise (Error (loc, Declared_but_undefined k))) in
754 8b3afe43 xthirioux
    (*Types.print_ty Format.std_formatter decl_type_k;
755 70e1006b xthirioux
      Types.print_ty Format.std_formatter computed_t;*)
756
    try_unify ~sub:true ~semi:true decl_type_k computed_t loc
757
  )
758
759 6aeb3388 xthirioux
let check_typedef_top decl =
760 70e1006b xthirioux
(*Format.eprintf "check_typedef %a@." Printers.pp_short_decl decl;*)
761 f4acee4c xthirioux
(*Format.eprintf "%a" Printers.pp_typedef (typedef_of_top decl);*)
762 70e1006b xthirioux
(*Format.eprintf "%a" Corelang.print_type_table ();*)
763 6aeb3388 xthirioux
  match decl.top_decl_desc with
764 70e1006b xthirioux
  | TypeDef ty ->
765
     let owner = decl.top_decl_owner in
766
     let itf = decl.top_decl_itf in
767
     let decl' =
768
       try Hashtbl.find type_table (Tydec_const (typedef_of_top decl).tydef_id)
769
       with Not_found -> raise (Error (decl.top_decl_loc, Declared_but_undefined ("type "^ ty.tydef_id))) in
770
     let owner' = decl'.top_decl_owner in
771 f4acee4c xthirioux
(*Format.eprintf "def owner = %s@.decl owner = %s@." owner' owner;*)
772 70e1006b xthirioux
     let itf' = decl'.top_decl_itf in
773
     (match decl'.top_decl_desc with
774
     | Const _ | Node _ | ImportedNode _ -> assert false
775
     | TypeDef ty' when coretype_equal ty'.tydef_desc ty.tydef_desc && owner' = owner && itf && (not itf') -> ()
776
     | _ -> raise (Error (decl.top_decl_loc, Type_mismatch ty.tydef_id)))
777 6aeb3388 xthirioux
  | _  -> ()
778
779
let check_typedef_compat header =
780
  List.iter check_typedef_top header
781 f22632aa ploc
782 0cbf0839 ploc
(* Local Variables: *)
783
(* compile-command:"make -C .." *)
784
(* End: *)