CristalCaveGem » LustreC

(********************************************************************)

(*                                                                  *)

(*  The LustreC compiler toolset   /  The LustreC Development Team  *)

(*  Copyright 2012 -    --   ONERA - CNRS - INPT                    *)

(*                                                                  *)

(*  LustreC is free software, distributed WITHOUT ANY WARRANTY      *)

(*  under the terms of the GNU Lesser General Public License        *)

(*  version 2.1.                                                    *)

(*                                                                  *)

(********************************************************************)

open Graph

type rat = int*int

type ident = string

type tag = int

type longident = (string * tag) list

exception TransposeError of int*int

(** General utility functions. *)

let create_hashtable size init =

  let tbl = Hashtbl.create size in

  List.iter (fun (key, data) -> Hashtbl.add tbl key data) init;

  tbl

module IdentModule =

struct (* Node module *)

  type t = ident

  let compare = compare

  let hash n = Hashtbl.hash n

  let equal n1 n2 = n1 = n2

end

module IMap = Map.Make(IdentModule)

module ISet = Set.Make(IdentModule)

exception DeSome

let desome x = match x with Some x -> x | None -> raise DeSome

let option_map f o =

  match o with

  | None   -> None

  | Some e -> Some (f e)

let add_cons x l =

 if List.mem x l then l else x::l

let rec remove_duplicates l =

 match l with

 | [] -> []

 | t::q -> add_cons t (remove_duplicates q)

let position pred l =

  let rec pos p l =

    match l with

    | [] -> assert false

    | t::q -> if pred t then p else pos (p+1) q

  in pos 0 l

let rec duplicate x n =

 if n < 0 then [] else x :: duplicate x (n - 1)

let enumerate n =

  let rec aux i =

    if i >= n then [] else i :: aux (i+1)

  in aux 0

let rec repeat n f x =

 if n <= 0 then x else repeat (n-1) f (f x)

let transpose_list ll =

  let rec transpose ll =

    match ll with

    | []   -> []

    | [l]  -> List.map (fun el -> [el]) l

    | l::q -> List.map2 (fun el eq -> el::eq) l (transpose q)

  in match ll with

  | []   -> []

  | l::q -> let length_l = List.length l in

	    List.iter (fun l' -> let length_l' = List.length l'

				 in if length_l <> length_l' then raise (TransposeError (length_l, length_l'))) q;

	    transpose ll

let rec filter_upto p n l =

 if n = 0 then [] else

 match l with

 | [] -> []

 | t::q -> if p t then t :: filter_upto p (n-1) q else filter_upto p n q

(* Warning: bad complexity *)

let list_of_imap imap =

  IMap.fold (fun i v (il,vl) -> (i::il,v::vl)) imap ([],[])

(** [gcd a b] returns the greatest common divisor of [a] and [b]. *)

let rec gcd a b =

  if b = 0 then a

  else gcd b (a mod b)

(** [lcm a b] returns the least common multiple of [a] and [b]. *)

let lcm a b =

  if a = 0 && b = 0 then

    0

  else a*b/(gcd a b)

(** [sum_rat (a,b) (a',b')] returns the sum of rationals [(a,b)] and

    [(a',b')] *)

let sum_rat (a,b) (a',b') =

  if a = 0 && b = 0 then

    (a',b')

  else if a'=0 && b'=0 then

    (a,b)

  else

    let lcm_bb' = lcm b b' in

    (a*lcm_bb'/b+a'*lcm_bb'/b',lcm_bb')

let simplify_rat (a,b) =

  let gcd = gcd a b in

  if (gcd =0) then

    (a,b)

  else (a/gcd,b/gcd)

let max_rat (a,b) (a',b') =

  let ratio_ab = (float_of_int a)/.(float_of_int b) in

  let ratio_ab' = (float_of_int a')/.(float_of_int b') in

  if ratio_ab > ratio_ab' then

    (a,b)

  else

    (a',b')

(** [list_union l1 l2] returns the union of list [l1] and [l2]. The

    result contains no duplicates. *)

let list_union l1 l2 =

  let rec aux l acc =

    match l with

    | [] -> acc

    | x::tl ->

        if List.mem x acc then

          aux tl acc

        else

          aux tl (x::acc)

  in

  let l1' = aux l1 [] in

  aux l2 l1'

(** [hashtbl_add h1 h2] adds all the bindings in [h2] to [h1]. If the

    intersection is not empty, it replaces the former binding *)

let hashtbl_add h1 h2 =

  Hashtbl.iter (fun key value -> Hashtbl.replace h1 key value) h2

let hashtbl_iterlast h f1 f2 =

  let l = Hashtbl.length h in

  ignore(

  Hashtbl.fold

    (fun k v cpt ->

      if cpt = l then

        begin f2 k v; cpt+1 end

      else

        begin f1 k v; cpt+1 end)

    h 1)

(** Match types variables to 'a, 'b, ..., for pretty-printing. Type

    variables are identified by integers. *)

let tnames = ref ([]: (int * string) list)

let tname_counter = ref 0

(* Same for carriers *)

let crnames = ref ([]: (int * string) list)

let crname_counter = ref 0

(* Same for dimension *)

let dnames = ref ([]: (int * string) list)

let dname_counter = ref 0

(* Same for delays *)

let inames = ref ([]: (int * string) list)

let iname_counter = ref 0

let reset_names () =

  tnames := []; tname_counter := 0; crnames := []; crname_counter := 0; dnames := []; dname_counter := 0; inames := []; iname_counter := 0

(* From OCaml compiler *)

let new_tname () =

  let tname =

    if !tname_counter < 26

    then String.make 1 (Char.chr(97 + !tname_counter))

    else String.make 1 (Char.chr(97 + !tname_counter mod 26)) ^

      string_of_int(!tname_counter / 26) in

  incr tname_counter;

  tname

let new_crname () =

  incr crname_counter;

  Format.sprintf "c%i" (!crname_counter-1)

let name_of_type id =

  try List.assoc id !tnames with Not_found ->

    let name = new_tname () in

    tnames := (id, name) :: !tnames;

    name

let name_of_carrier id =

  let pp_id =

    try List.assoc id !crnames with Not_found ->

      let name = new_crname () in

      crnames := (id,name) :: !crnames;

      name

  in

  pp_id

let new_dname () =

  incr dname_counter;

  Format.sprintf "d%i" (!dname_counter-1)

let name_of_dimension id =

  try List.assoc id !dnames with Not_found ->

    let name = new_dname () in

    dnames := (id, name) :: !dnames;

    name

let new_iname () =

  incr iname_counter;

  Format.sprintf "t%i" (!iname_counter-1)

let name_of_delay id =

  try List.assoc id !inames with Not_found ->

    let name = new_iname () in

    inames := (id, name) :: !inames;

    name

open Format

let print_rat fmt (a,b) =

  if b=1 then

    Format.fprintf fmt "%i" a

  else

    if b < 0 then

      Format.fprintf fmt "%i/%i" (-a) (-b)

    else

      Format.fprintf fmt "%i/%i" a b

(* Generic pretty printing *)

let pp_final_char_if_non_empty c l =

  (fun fmt -> match l with [] -> () | _ -> Format.fprintf fmt "%(%)" c)

let pp_newline_if_non_empty l =

  (fun fmt -> match l with [] -> () | _ -> Format.fprintf fmt "@,")

let rec fprintf_list ~sep:sep f fmt = function

  | []   -> ()

  | [e]  -> f fmt e

  | x::r -> Format.fprintf fmt "%a%(%)%a" f x sep (fprintf_list ~sep f) r

let pp_list l pp_fun beg_str end_str sep_str =

  if (beg_str="\n") then

    print_newline ()

  else

    print_string beg_str;

  let rec pp_l l =

    match l with

    | [] -> ()

    | [hd] -> 

        pp_fun hd

    | hd::tl ->

        pp_fun hd;

        if (sep_str="\n") then

          print_newline ()

        else

          print_string sep_str;

        pp_l tl

  in

  pp_l l;

  if (end_str="\n") then

    print_newline ()

  else

    print_string end_str

let pp_array a pp_fun beg_str end_str sep_str =

  if (beg_str="\n") then

    print_newline ()

  else

    print_string beg_str;

  let n = Array.length a in

  if n > 0 then

    begin

      Array.iter (fun x -> pp_fun x; print_string sep_str) (Array.sub a 0 (n-1));

      pp_fun a.(n-1)

    end;

  if (end_str="\n") then

    print_newline ()

  else

    print_string end_str

let pp_iset fmt t =

  begin

    Format.fprintf fmt "{@ ";

    ISet.iter (fun s -> Format.fprintf fmt "%s@ " s) t;

    Format.fprintf fmt "}@."

  end

let pp_hashtbl t pp_fun beg_str end_str sep_str =

  if (beg_str="\n") then

    print_newline ()

  else

    print_string beg_str;

  let pp_fun1 k v =

    pp_fun k v;

    if (sep_str="\n") then

      print_newline ()

    else

      print_string sep_str

  in

  hashtbl_iterlast t pp_fun1 pp_fun;

  if (end_str="\n") then

    print_newline ()

  else

    print_string end_str

let pp_longident lid =

  let pp_fun (nid, tag) =

    print_string nid;

    print_string "(";

    print_int tag;

    print_string ")"

  in

  pp_list lid pp_fun "" "." "."  

let pp_date fmt tm =

  Format.fprintf fmt "%i/%i/%i, %i:%i:%i"

    (tm.Unix.tm_year + 1900)

    tm.Unix.tm_mon

    tm.Unix.tm_mday

    tm.Unix.tm_hour

    tm.Unix.tm_min

    tm.Unix.tm_sec

(* Used for uid in variables *)

let var_id_cpt = ref 0

let get_new_id () = incr var_id_cpt;!var_id_cpt

let track_exception () =

 if !Options.track_exceptions

 then (Printexc.print_backtrace stdout; flush stdout)

 else ()

(* for lexing purposes *)

(* Update line number for location info *)

let incr_line lexbuf =

  let pos = lexbuf.Lexing.lex_curr_p in

  lexbuf.Lexing.lex_curr_p <- { pos with

    Lexing.pos_lnum = pos.Lexing.pos_lnum + 1;

    Lexing.pos_bol = pos.Lexing.pos_cnum;

  }

let last_tag = ref (-1)

let new_tag () =

  incr last_tag; !last_tag

(* Local Variables: *)

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

(* End: *)