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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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(** Types definitions and a few utility functions on types. *)
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open Utils
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open Dimension
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type type_expr =
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    {mutable tdesc: type_desc;
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     tid: int}
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and type_desc =
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  | Tconst of ident (* type constant *)
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  | Tint
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  | Treal
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  | Tbool
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  | Trat (* Actually unused for now. Only place where it can appear is
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            in a clock declaration *)
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  | Tclock of type_expr (* A type expression explicitely tagged as carrying a clock *)
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  | Tarrow of type_expr * type_expr
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  | Ttuple of type_expr list
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  | Tenum of ident list
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  | Tstruct of (ident * type_expr) list
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  | Tarray of dim_expr * type_expr
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  | Tstatic of dim_expr * type_expr (* a type carried by a dimension expression *)
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  | Tlink of type_expr (* During unification, make links instead of substitutions *)
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  | Tvar (* Monomorphic type variable *)
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  | Tunivar (* Polymorphic type variable *)
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type error =
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    Unbound_value of ident  
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  | Already_bound of ident
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  | Already_defined of ident
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  | Undefined_var of ISet.t
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  | Declared_but_undefined of ident
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  | Unbound_type of ident
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  | Not_a_dimension
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  | Not_a_constant
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  | Assigned_constant of ident
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  | WrongArity of int * int
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  | WrongMorphism of int * int
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  | Type_mismatch of ident
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  | Type_clash of type_expr * type_expr
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  | Poly_imported_node of ident
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exception Unify of type_expr * type_expr
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exception Error of Location.t * error
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(* Pretty-print*)
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open Format
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let rec print_struct_ty_field fmt (label, ty) =
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  fprintf fmt "%a : %a" pp_print_string label print_ty ty
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and print_ty fmt ty =
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  match ty.tdesc with
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  | Tvar ->
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    fprintf fmt "_%s" (name_of_type ty.tid)
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  | Tint ->
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    fprintf fmt "int"
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  | Treal ->
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    fprintf fmt "real"
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  | Tbool ->
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    fprintf fmt "bool"
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  | Tclock t ->
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    fprintf fmt "%a clock" print_ty t
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  | Tstatic (d, t) ->
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    fprintf fmt "(%a:%a)" Dimension.pp_dimension d print_ty t
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  | Tconst t ->
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    fprintf fmt "%s" t
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  | Trat ->
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    fprintf fmt "rat"
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  | Tarrow (ty1,ty2) ->
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    fprintf fmt "%a -> %a" print_ty ty1 print_ty ty2
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  | Ttuple tylist ->
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    fprintf fmt "(%a)"
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      (Utils.fprintf_list ~sep:" * " print_ty) tylist
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  | Tenum taglist ->
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    fprintf fmt "enum {%a }"
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      (Utils.fprintf_list ~sep:", " pp_print_string) taglist
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  | Tstruct fieldlist ->
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    fprintf fmt "struct {%a }"
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      (Utils.fprintf_list ~sep:"; " print_struct_ty_field) fieldlist
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  | Tarray (e, ty) ->
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    fprintf fmt "%a^%a" print_ty ty Dimension.pp_dimension e
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  | Tlink ty ->
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      print_ty fmt ty
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  | Tunivar ->
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    fprintf fmt "'%s" (name_of_type ty.tid)
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let rec print_node_struct_ty_field fmt (label, ty) =
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  fprintf fmt "%a : %a" pp_print_string label print_node_ty ty
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and print_node_ty fmt ty =
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  match ty.tdesc with
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  | Tvar -> begin
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(*Format.eprintf "DEBUG:Types.print_node@.";*)
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    fprintf fmt "_%s" (name_of_type ty.tid)
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end
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  | Tint ->
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    fprintf fmt "int"
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  | Treal ->
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    fprintf fmt "real"
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  | Tbool ->
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    fprintf fmt "bool"
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  | Tclock t ->
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    fprintf fmt "%a clock" print_node_ty t
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  | Tstatic (_, t) ->
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    fprintf fmt "%a" print_node_ty t
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  | Tconst t ->
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    fprintf fmt "%s" t
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  | Trat ->
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    fprintf fmt "rat"
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  | Tarrow (ty1,ty2) ->
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    fprintf fmt "%a -> %a" print_node_ty ty1 print_node_ty ty2
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  | Ttuple tylist ->
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    fprintf fmt "(%a)"
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      (Utils.fprintf_list ~sep:"*" print_node_ty) tylist
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  | Tenum taglist ->
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    fprintf fmt "enum {%a }"
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      (Utils.fprintf_list ~sep:", " pp_print_string) taglist
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  | Tstruct fieldlist ->
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    fprintf fmt "struct {%a }"
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      (Utils.fprintf_list ~sep:"; " print_node_struct_ty_field) fieldlist
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  | Tarray (e, ty) ->
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    fprintf fmt "%a^%a" print_node_ty ty Dimension.pp_dimension e
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  | Tlink ty ->
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      print_node_ty fmt ty
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  | Tunivar ->
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    fprintf fmt "'%s" (name_of_type ty.tid)
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let pp_error fmt = function
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  | Unbound_value id ->
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    fprintf fmt "Unknown value %s@." id
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  | Unbound_type id ->
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    fprintf fmt "Unknown type %s@." id
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  | Already_bound id ->
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    fprintf fmt "%s is already declared@." id
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  | Already_defined id ->
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    fprintf fmt "Multiple definitions of variable %s@." id
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  | Not_a_constant ->
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    fprintf fmt "This expression is not a constant@."
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  | Assigned_constant id ->
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    fprintf fmt "The constant %s cannot be assigned@." id
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  | Not_a_dimension ->
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    fprintf fmt "This expression is not a valid dimension@."
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  | WrongArity (ar1, ar2) ->
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    fprintf fmt "Expecting %d argument(s), found %d@." ar1 ar2
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  | WrongMorphism (ar1, ar2) ->
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    fprintf fmt "Expecting %d argument(s) for homomorphic extension, found %d@." ar1 ar2
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  | Type_mismatch id ->
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    fprintf fmt "Definition and declaration of type %s don't agree@." id
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  | Undefined_var vset ->
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    fprintf fmt "No definition provided for variable(s): %a@."
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      (Utils.fprintf_list ~sep:"," pp_print_string)
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      (ISet.elements vset)
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  | Declared_but_undefined id ->
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     fprintf fmt "%s is declared but not defined@." id
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  | Type_clash (ty1,ty2) ->
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      Utils.reset_names ();
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    fprintf fmt "Expected type %a, got type %a@." print_ty ty1 print_ty ty2
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  | Poly_imported_node id ->
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    fprintf fmt "Imported nodes cannot have a polymorphic type@."
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let new_id = ref (-1)
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let new_ty desc =
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  incr new_id; {tdesc = desc; tid = !new_id }
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let new_var () =
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  new_ty Tvar
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let new_univar () =
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  new_ty Tunivar
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let rec repr =
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  function
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    {tdesc = Tlink t'} ->
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      repr t'
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  | t -> t
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let get_static_value ty =
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  match (repr ty).tdesc with
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  | Tstatic (d, _) -> Some d
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  | _              -> None
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let get_field_type ty label =
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  match (repr ty).tdesc with
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  | Tstruct fl -> (try Some (List.assoc label fl) with Not_found -> None)
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  | _          -> None
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let is_numeric_type ty =
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 match (repr ty).tdesc with
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 | Tint
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 | Treal -> true
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 | _     -> false
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let is_bool_type ty =
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 match (repr ty).tdesc with
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 | Tbool -> true
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 | _     -> false
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let get_clock_base_type ty =
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 match (repr ty).tdesc with
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 | Tclock ty -> Some ty
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 | _         -> None
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let unclock_type ty =
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  let ty = repr ty in
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  match ty.tdesc with
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  | Tclock ty' -> ty'
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  | _          -> ty
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let rec is_dimension_type ty =
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 match (repr ty).tdesc with
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 | Tint
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 | Tbool -> true
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 | Tclock ty'
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 | Tstatic (_, ty') -> is_dimension_type ty'
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 | _                -> false
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let dynamic_type ty =
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  let ty = repr ty in
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  match ty.tdesc with
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  | Tstatic (_, ty') -> ty'
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  | _                -> ty
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let is_tuple_type ty =
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 match (repr ty).tdesc with
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 | Ttuple _         -> true
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 | _                -> false
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let map_tuple_type f ty =
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  let ty = dynamic_type ty in
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  match ty.tdesc with
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  | (Ttuple ty_list) -> { ty with tdesc = Ttuple (List.map f ty_list) }
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  | _                -> f ty
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let rec is_struct_type ty =
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 match (repr ty).tdesc with
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 | Tstruct _        -> true
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 | Tstatic (_, ty') -> is_struct_type ty'
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 | _                -> false
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let struct_field_type ty field =
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  match (dynamic_type ty).tdesc with
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  | Tstruct fields ->
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    (try
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       List.assoc field fields
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     with Not_found -> assert false)
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  | _              -> assert false
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let rec is_array_type ty =
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 match (repr ty).tdesc with
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 | Tarray _         -> true
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 | Tstatic (_, ty') -> is_array_type ty' (* looks strange !? *)
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 | _                -> false
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let array_type_dimension ty =
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  match (dynamic_type ty).tdesc with
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  | Tarray (d, _) -> d
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  | _             -> (Format.eprintf "internal error: Types.array_type_dimension %a@." print_ty ty; assert false)
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let rec array_type_multi_dimension ty =
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  match (dynamic_type ty).tdesc with
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  | Tarray (d, ty') -> d :: array_type_multi_dimension ty'
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  | _               -> []
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let array_element_type ty =
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  match (dynamic_type ty).tdesc with
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  | Tarray (_, ty') -> ty'
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  | _               -> (Format.eprintf "internal error: Types.array_element_type %a@." print_ty ty; assert false)
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let rec array_base_type ty =
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  let ty = repr ty in
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  match ty.tdesc with
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  | Tarray (_, ty')
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  | Tstatic (_, ty') -> array_base_type ty'
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  | _                -> ty
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let is_address_type ty =
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  is_array_type ty || is_struct_type ty
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let rec is_generic_type ty =
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 match (dynamic_type ty).tdesc with
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  | Tarray (d, ty') ->
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    (not (Dimension.is_dimension_const d)) || (is_generic_type ty')
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  | _               -> false
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(** Splits [ty] into the [lhs,rhs] of an arrow type. Expects an arrow type
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    (ensured by language syntax) *)
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let rec split_arrow ty =
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  match (repr ty).tdesc with
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  | Tarrow (tin,tout) -> tin,tout
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  | Tstatic (_, ty')  -> split_arrow ty'
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    (* Functions are not first order, I don't think the var case
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       needs to be considered here *)
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  | _ -> Format.eprintf "type %a is not a map@.Unable to split@.@?" print_ty ty; assert false
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(** Returns the type corresponding to a type list. *)
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let type_of_type_list tyl =
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  if (List.length tyl) > 1 then
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    new_ty (Ttuple tyl)
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  else
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    List.hd tyl
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let type_list_of_type ty =
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 match (repr ty).tdesc with
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 | Ttuple tl -> tl
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 | _         -> [ty]
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(** [is_polymorphic ty] returns true if [ty] is polymorphic. *)
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let rec is_polymorphic ty =
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  match ty.tdesc with
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  | Tenum _ | Tvar | Tint | Treal | Tbool | Trat | Tconst _ -> false
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  | Tclock ty -> is_polymorphic ty
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  | Tarrow (ty1,ty2) -> (is_polymorphic ty1) || (is_polymorphic ty2)
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  | Ttuple tl -> List.exists (fun t -> is_polymorphic t) tl
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  | Tstruct fl -> List.exists (fun (_, t) -> is_polymorphic t) fl
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  | Tlink t' -> is_polymorphic t'
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  | Tarray (d, ty)
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  | Tstatic (d, ty) -> Dimension.is_polymorphic d || is_polymorphic ty
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  | Tunivar -> true
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let mktyptuple nb typ =
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  let array = Array.make nb typ in
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  Ttuple (Array.to_list array)
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(* Local Variables: *)
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(* compile-command:"make -C .." *)
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(* End: *)