pgm_types.mli 3.61 KB
Newer Older
1 2 3 4 5 6 7 8 9

open Why
open Util
open Ident
open Ty
open Theory
open Term
open Decl

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
(* mutable type symbols *)

type mtsymbol = private {
  mt_name  : ident;
  mt_args  : tvsymbol list;
  mt_model : ty option;
  mt_abstr : tysymbol;
}

val create_mtsymbol : preid -> tvsymbol list -> ty option -> mtsymbol

val mt_equal : mtsymbol -> mtsymbol -> bool

exception NotMutable

val get_mtsymbol : tysymbol -> mtsymbol
  (** raises [NotMutable] if [ts] is not a mutable type *)

28 29
val is_mutable_ts : tysymbol -> bool
val is_mutable_ty : ty       -> bool
30

31
val ts_arrow : tysymbol
32
val make_arrow_type : ty list -> ty -> ty
33

34 35 36
val ts_exn : tysymbol
val ty_exn : ty

37 38
(* val ts_label : tysymbol *)

39
(* program types *)
40
module rec T : sig
41

42
  type pre = Term.fmla
43

44 45 46 47
  type post_fmla = Term.vsymbol (* result *) * Term.fmla
  type exn_post_fmla = Term.vsymbol (* result *) option * Term.fmla
      
  type esymbol = lsymbol
48

49 50 51 52 53
  type post = post_fmla * (esymbol * exn_post_fmla) list
      
  type type_v = private
  | Tpure    of ty
  | Tarrow   of pvsymbol list * type_c
54

55 56 57 58 59 60
  and type_c = { 
    c_result_type : type_v;
    c_effect      : E.t;
    c_pre         : pre;
    c_post        : post; 
  }
61

62 63 64 65 66 67
  and pvsymbol = private {
    pv_name : ident;
    pv_tv   : type_v;
    pv_ty   : ty;      (* as a logic type, for typing purposes only *)
    pv_vs   : vsymbol; (* for use in the logic *)
  }
68

69 70
  val tpure  : ty -> type_v
  val tarrow : pvsymbol list -> type_c -> type_v
71

72
  val create_pvsymbol : preid -> ?vs:vsymbol -> type_v -> pvsymbol
73

74
  (* program symbols *)
75

76 77 78 79 80 81 82 83
  type psymbol = private {
    p_name : ident;
    p_tv   : type_v;
    p_ty   : ty;      (* as a logic type, for typing purposes only *)
    p_ls   : lsymbol; (* for use in the logic *) 
  }
      
  val create_psymbol : preid -> type_v -> psymbol
84

85
  val p_equal : psymbol -> psymbol -> bool
86

87
  (* program types -> logic types *)
88

89 90 91 92 93 94 95 96
  val purify : ty -> ty
  val purify_type_v : ?logic:bool -> type_v -> ty
    (** when [logic] is [true], mutable types are turned into their models *)
    
  (* operations on program types *)
    
  val apply_type_v_var : type_v -> pvsymbol -> type_c
  val apply_type_v_sym : type_v -> psymbol  -> type_c
97
  val apply_type_v_ref : type_v -> R.t      -> type_c
98 99 100 101 102 103 104 105 106 107 108
    
  val occur_type_v : R.t -> type_v -> bool
    
  val v_result : ty -> vsymbol
  val exn_v_result : Why.Term.lsymbol -> Why.Term.vsymbol option
    
  val post_map : (fmla -> fmla) -> post -> post
    
  val subst1 : vsymbol -> term -> term Mvs.t
    
  val eq_type_v : type_v -> type_v -> bool
109

110
  (* pretty-printers *)
111

112 113 114
  val print_type_v : Format.formatter -> type_v -> unit
  val print_type_c : Format.formatter -> type_c -> unit
  val print_post   : Format.formatter -> post   -> unit
115

116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
end 

and Mpv :  sig include Map.S with type key = T.pvsymbol end

(* references *)
and R : sig

  type t = 
    | Rlocal  of T.pvsymbol
    | Rglobal of T.psymbol

  val type_of : t -> ty

  val name_of : t -> ident

end 
and Sref : sig include Set.S with type elt = R.t end
and Mref : sig include Map.S with type key = R.t end
and Sexn : sig include Set.S with type elt = T.esymbol end

(* effects *)
and E : sig
138

139 140 141 142 143
  type t = private {
    reads  : Sref.t;
    writes : Sref.t;
    raises : Sexn.t;
  }
144

145
  val empty : t
146

147 148 149
  val add_read  : R.t -> t -> t
  val add_write : R.t -> t -> t
  val add_raise : T.esymbol -> t -> t
150

151 152
  val remove_reference : R.t -> t -> t    
  val filter : (R.t -> bool) -> t -> t
153

154
  val remove_raise : T.esymbol -> t -> t
155

156
  val union : t -> t -> t
157

158 159 160 161 162
  val equal : t -> t -> bool
    
  val no_side_effect : t -> bool
    
  val subst : R.t Mpv.t -> t -> t
163

164
  val occur : R.t -> t -> bool
165

166 167
  val print : Format.formatter -> t -> unit

168
end 
169 170