CristalCaveGem » LustreC

(** Main module for generating packages bodies

 **)

  (* Printing functions for basic operations *)

  (** Printing function for expressions [v1 modulo v2]. Depends

      on option [integer_div_euclidean] to choose between mathematical

      modulo or remainder ([rem] in Ada).

      @param pp_val pretty printer for values

      @param v1 the first value in the expression

      @param v2 the second value in the expression

      @param fmt the formater to print on

   **)

  let pp_mod pp_val v1 v2 fmt =

    if !Options.integer_div_euclidean then

      (* (a rem b) + (a rem b < 0 ? abs(b) : 0) *)

      Format.fprintf fmt

        "((%a rem %a) + (if (%a rem %a) < 0 then abs(%a) else 0))"

        pp_val v1 pp_val v2

        pp_val v1 pp_val v2

        pp_val v2

    else (* Ada behavior for rem *)

      Format.fprintf fmt "(%a rem %a)" pp_val v1 pp_val v2

  (** Printing function for expressions [v1 div v2]. Depends on

      option [integer_div_euclidean] to choose between mathematic

      division or Ada division.

      @param pp_val pretty printer for values

      @param v1 the first value in the expression

      @param v2 the second value in the expression

      @param fmt the formater to print in

   **)

  let pp_div pp_val v1 v2 fmt =

    if !Options.integer_div_euclidean then

      (* (a - ((a rem b) + (if a rem b < 0 then abs (b) else 0))) / b) *)

      Format.fprintf fmt "(%a - %t) / %a"

        pp_val v1

        (pp_mod pp_val v1 v2)

        pp_val v2

    else (* Ada behovior for / *)

      Format.fprintf fmt "(%a / %a)" pp_val v1 pp_val v2

  (** Printing function for basic lib functions.

      @param is_int boolean to choose between integer

                    division (resp. remainder) or Ada division

                    (resp. remainder)

      @param i a string representing the function

      @param pp_val the pretty printer for values

      @param fmt the formater to print on

      @param vl the list of operands

   **)

  let pp_basic_lib_fun is_int i pp_val fmt vl =

    match i, vl with

    | "uminus", [v] -> Format.fprintf fmt "(- %a)" pp_val v

    | "not", [v] -> Format.fprintf fmt "(not %a)" pp_val v

    | "impl", [v1; v2] -> Format.fprintf fmt "(not %a or else %a)" pp_val v1 pp_val v2

    | "=", [v1; v2] -> Format.fprintf fmt "(%a = %a)" pp_val v1 pp_val v2

    | "mod", [v1; v2] ->

      if is_int then

        pp_mod pp_val v1 v2 fmt

      else

        Format.fprintf fmt "(%a rem %a)" pp_val v1 pp_val v2

    | "equi", [v1; v2] -> Format.fprintf fmt "((not %a) = (not %a))" pp_val v1 pp_val v2

    | "xor", [v1; v2] -> Format.fprintf fmt "((not %a) \\= (not %a))" pp_val v1 pp_val v2

    | "/", [v1; v2] ->

      if is_int then

        pp_div pp_val v1 v2 fmt

      else

        Format.fprintf fmt "(%a / %a)" pp_val v1 pp_val v2

    | _, [v1; v2] -> Format.fprintf fmt "(%a %s %a)" pp_val v1 i pp_val v2

    | _ -> (Format.eprintf "internal compilation error: basic function %s@." i; assert false)

  (** Printing function for basic assignement [var_name := value;].

      @param pp_var pretty printer for variables

      @param fmt the formater to print on

      @param var_name the name of the variable

      @param value the value to be assigned

   **)

  let pp_basic_assign pp_var fmt var_name value =

    fprintf fmt "%a := %a;"

      pp_var var_name

      pp_var value

  (** Printing function for assignement. For the moment, only use

      [pp_basic_assign] function.

      @param pp_var pretty printer for variables

      @param fmt the formater to print on

      @param var_name the name of the variable

      @param value the value to be assigned

   **)

  let pp_assign pp_var fmt var_name value = pp_basic_assign

  (** Printing function for instruction. See

      {!type:Machine_code_types.instr_t} for more details on

      machine types.

      @param machine the current machine

      @param fmt the formater to print on

      @param instr the instruction to print

   **)

  let pp_machine_instr machine fmt instr =

    match get_instr_desc instr with

    (* no reset *)

    | MNoReset _ -> ()

    (* reset  *)

    | MReset i ->

      (* pp_machine_reset m self fmt i *)

      fprintf fmt "MReset %s@ " i

    | MLocalAssign (i,v) ->

      fprintf fmt "MLocalAssign";

      (* pp_assign

       *   machine self (pp_c_var_read m) fmt

       *   i.var_type (mk_val (Var i) i.var_type) v *)

    | MStateAssign (i,v) ->

      fprintf fmt "MStateAssign"

    (* pp_assign

       *   m self (pp_c_var_read m) fmt

       *   i.var_type (mk_val (Var i) i.var_type) v *)

    | MStep ([i0], i, vl) when Basic_library.is_value_internal_fun

          (mk_val (Fun (i, vl)) i0.var_type)  ->

      fprintf fmt "MStep basic"

    (* pp_machine_instr dependencies m self fmt

     *   (update_instr_desc instr (MLocalAssign (i0, mk_val (Fun (i, vl)) i0.var_type))) *)

    | MStep (il, i, vl) -> fprintf fmt "MStep"

    (* pp_basic_instance_call m self fmt i vl il *)

    | MBranch (_, []) -> fprintf fmt "MBranch []"

    (* (Format.eprintf "internal error: C_backend_src.pp_machine_instr %a@." (pp_instr m) instr; assert false) *)

    | MBranch (g, hl) -> fprintf fmt "MBranch gen"

    (* if let t = fst (List.hd hl) in t = tag_true || t = tag_false

     * then (\* boolean case, needs special treatment in C because truth value is not unique *\)

     *   (\* may disappear if we optimize code by replacing last branch test with default *\)

     *   let tl = try List.assoc tag_true  hl with Not_found -> [] in

     *   let el = try List.assoc tag_false hl with Not_found -> [] in

     *   pp_conditional dependencies m self fmt g tl el

     * else (\* enum type case *\)

     *   (\*let g_typ = Typing.type_const Location.dummy_loc (Const_tag (fst (List.hd hl))) in*\)

     *   fprintf fmt "@[<v 2>switch(%a) {@,%a@,}@]"

     *     (pp_c_val m self (pp_c_var_read m)) g

     *     (Utils.fprintf_list ~sep:"@," (pp_machine_branch dependencies m self)) hl *)

    | MComment s  ->

      fprintf fmt "-- %s@ " s

    | _ -> fprintf fmt "Don't  know"

    (fun i -> match get_instr_desc i with MReset i -> i | _ -> assert false)

(* Local Variables: *)

(* compile-command: "make -C ../../.." *)

(* End: *)