## lustrec / src / types.ml @ 79614a15

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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: *) |