compile.ml 27.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
(********************************************************************)
(*                                                                  *)
(*  The Why3 Verification Platform   /   The Why3 Development Team  *)
(*  Copyright 2010-2016   --   INRIA - CNRS - Paris-Sud University  *)
(*                                                                  *)
(*  This software is distributed under the terms of the GNU Lesser  *)
(*  General Public License version 2.1, with the special exception  *)
(*  on linking described in file LICENSE.                           *)
(*                                                                  *)
(********************************************************************)

(*
  - option to extract into a single file

  - no more why3extract.cma
    use driver preludes instead

  - 2 drivers for nums and zarith

  - no delcaration at all for a module -> no file produced
    (e.g. ref.Ref)

  - suggest a command line to compile the extracted code
    (for instance in a comment)

  - drivers for val now may use %1, %2, etc. (though not mandatory)
    Capp f x y
      "..." -> "..." x y
      "...%1..." -> "...x..." y
      "..(*%1*)..." -> "...(*x*)..." y
      "..%1..%3.." -> (fun z -> "..x..z..")  (y ignored)

  - extract file f.mlw into OCaml file f.ml, with sub-modules

  - "use (im|ex)port" -> "open"
    but OCaml's open is not transitive, so requires some extra work
    to figure out all the opens

  - if a WhyML module M is extracted to something that is a signature,
    then extract "module type B_sig = ..." (as well as "module B = ...")

  - use a black list in printer to avoid clash with Pervasives symbols
    (e.g. ref, (!), etc.)

*)

47 48 49 50 51
(*
  Questions pour Jean-Christophe et Andreï :
    - est-ce qu'il y a des utilisations particulières du champ
      [itd_fields], vis-à-vis du champ [itd_constructors] ?

52 53 54
    - comme l'AST [expr] est déjà en forme normale-A, est-ce que ça
      fait du sense pour vous d'utiliser des applications de la forme
      [Eapp of ident * ident list] ?
55 56 57 58

    - faire un module Erasure, pour y concentrer tout ce qui
      appartient à l'éffacement du code fantôme ?

59 60
    - comment est-ce qu'il marche la [mask] d'un [prog_pattern] ?

61
 *)
62

63 64
(*
  TODO: réfléchir sur l'affectation parallèle
65 66 67
*)


68 69 70 71
(** Abstract syntax of ML *)

open Ident
open Ity
Mário Pereira's avatar
Mário Pereira committed
72
open Ty
Mário Pereira's avatar
Mário Pereira committed
73
open Term
74

Mário Pereira's avatar
Mário Pereira committed
75 76 77 78 79 80 81 82
let clean_name fname =
  (* TODO: replace with Filename.remove_extension
   * after migration to OCaml 4.04+ *)
  let remove_extension s =
    try Filename.chop_extension s with Invalid_argument _ -> s in
  let f = Filename.basename fname in (remove_extension f)

let module_name ?fname path t =
Mário Pereira's avatar
Mário Pereira committed
83
  let fname = match fname, path with
Mário Pereira's avatar
Mário Pereira committed
84 85 86 87 88
    | None, "why3"::_ -> "why3"
    | None, _   -> String.concat "__" path
    | Some f, _ -> clean_name f in
  fname ^ "__" ^ t

89 90
module ML = struct

91 92
  open Expr

93
  type ty =
94
    | Tvar    of tvsymbol
95 96 97
    | Tapp    of ident * ty list
    | Ttuple  of ty list

98 99 100
  type is_ghost = bool

  type var = ident * ty * is_ghost
101

Mário Pereira's avatar
Mário Pereira committed
102 103
  type for_direction = To | DownTo

104 105 106
  type pat =
    | Pwild
    | Pident  of ident
Mário Pereira's avatar
Mário Pereira committed
107
    | Papp    of lsymbol * pat list
108 109 110 111 112 113 114 115
    | Ptuple  of pat list
    | Por     of pat * pat
    | Pas     of pat * ident

  type is_rec = bool

  type binop = Band | Bor | Beq

116
  type ity = I of Ity.ity | C of Ity.cty (* TODO: keep it like this? *)
117

118
  type expr = {
Mário Pereira's avatar
Mário Pereira committed
119 120 121
    e_node   : expr_node;
    e_ity    : ity;
    e_effect : effect;
122
    (* TODO: add the set of free variables? *)
123 124 125 126
  }

  and expr_node =
    | Econst  of Number.integer_constant
127
    | Evar    of pvsymbol
128
    | Eapp    of rsymbol * expr list
129
    | Efun    of var list * expr
Mário Pereira's avatar
Mário Pereira committed
130
    | Elet    of let_def * expr
131
    | Eif     of expr * expr * expr
Mário Pereira's avatar
Mário Pereira committed
132
    (* | Ecast   of expr * ty *)
Mário Pereira's avatar
Mário Pereira committed
133
    | Eassign of (pvsymbol * rsymbol * pvsymbol) list
134 135 136
    | Ematch  of expr * (pat * expr) list
    | Eblock  of expr list
    | Ewhile  of expr * expr
Mário Pereira's avatar
Mário Pereira committed
137 138
    (* For loop for Why3's type int *)
    | Efor    of pvsymbol * pvsymbol * for_direction * pvsymbol * expr
Mário Pereira's avatar
Mário Pereira committed
139 140
    | Eraise  of xsymbol * expr option
    | Etry    of expr * (xsymbol * pvsymbol list * expr) list
141 142
    | Eabsurd

Mário Pereira's avatar
Mário Pereira committed
143 144
  and let_def =
    | Lvar of pvsymbol * expr
Mário Pereira's avatar
Mário Pereira committed
145
    | Lsym of rsymbol * ty * var list * expr
Mário Pereira's avatar
Mário Pereira committed
146 147 148 149 150 151 152
    | Lrec of rdef list

  and rdef = {
    rec_sym  : rsymbol; (* exported *)
    rec_rsym : rsymbol; (* internal *)
    rec_args : var list;
    rec_exp  : expr;
Mário Pereira's avatar
Mário Pereira committed
153
    rec_res  : ty;
Mário Pereira's avatar
Mário Pereira committed
154 155
  }

156 157 158 159 160 161 162
  type is_mutable = bool

  type typedef =
    | Ddata     of (ident * ty list) list
    | Drecord   of (is_mutable * ident * ty) list
    | Dalias    of ty

163 164 165 166 167 168 169
  type its_defn = {
    its_name    : ident;
    its_args    : tvsymbol list;
    its_private : bool;
    its_def     : typedef option;
  }

170
  type decl = (* TODO add support for the extraction of ocaml modules *)
Mario Pereira's avatar
Mario Pereira committed
171
    | Dtype   of its_defn list
Mário Pereira's avatar
Mário Pereira committed
172
    | Dlet    of let_def
173
        (* TODO add return type? *)
Mario Pereira's avatar
Mario Pereira committed
174 175
    | Dexn    of xsymbol * ty option

Mário Pereira's avatar
Mário Pereira committed
176 177 178 179 180 181 182 183 184 185
  type known_map = decl Mid.t

  type pmodule = {
    mod_decl  : decl list;
    mod_known : known_map;
  }

  let add_known_decl id decl k_map =
    Mid.add id decl k_map

Mário Pereira's avatar
Mário Pereira committed
186 187
  let rec iter_deps_ty f = function
    | Tvar _ -> ()
Mário Pereira's avatar
Mário Pereira committed
188
    | Tapp (id, ty_l) -> f id; List.iter (iter_deps_ty f) ty_l
Mário Pereira's avatar
Mário Pereira committed
189 190 191
    | Ttuple ty_l -> List.iter (iter_deps_ty f) ty_l

  let iter_deps_typedef f = function
Mário Pereira's avatar
Mário Pereira committed
192 193 194
    | Ddata constrl ->
      List.iter (fun (_, tyl) -> List.iter (iter_deps_ty f) tyl) constrl
    | Drecord _pjl -> assert false (*TODO*)
Mário Pereira's avatar
Mário Pereira committed
195 196 197 198 199
    | Dalias ty -> iter_deps_ty f ty

  let iter_deps_its_defn f its_d =
    Opt.iter (iter_deps_typedef f) its_d.its_def

Mário Pereira's avatar
Mário Pereira committed
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264
  let iter_deps_args f =
    List.iter (fun (_, ty_arg, _) -> iter_deps_ty f ty_arg)

  let rec iter_deps_xbranch f (xs, _, e) =
    f xs.xs_name;
    iter_deps_expr f e

  and iter_deps_pat_list f patl =
    List.iter (iter_deps_pat f) patl

  and iter_deps_pat f = function
    | Pwild | Pident _ -> ()
    | Papp (ls, patl) ->
      f ls.ls_name;
      iter_deps_pat_list f patl
    | Ptuple patl -> iter_deps_pat_list f patl
    | Por (p1, p2) ->
      iter_deps_pat f p1;
      iter_deps_pat f p2
    | Pas (p, _) -> iter_deps_pat f p

  and iter_deps_expr f e = match e.e_node with
    | Econst _ | Evar _ | Eabsurd -> ()
    | Eapp (rs, exprl) ->
      f rs.rs_name; List.iter (iter_deps_expr f) exprl
    | Efun _ -> assert false
    | Elet (Lvar (_, e1), e2) ->
      iter_deps_expr f e1;
      iter_deps_expr f e2
    | Elet (Lsym (_, ty_result, args, e1), e2) ->
      iter_deps_ty f ty_result;
      List.iter (fun (_, ty_arg, _) -> iter_deps_ty f ty_arg) args;
      iter_deps_expr f e1;
      iter_deps_expr f e2
    | Elet ((Lrec rdef), e) ->
      List.iter
        (fun {rec_sym = rs; rec_args = args; rec_exp = e; rec_res = res} ->
           f rs.rs_name; iter_deps_args f args;
           iter_deps_expr f e; iter_deps_ty f res) rdef;
      iter_deps_expr f e
    | Ematch (e, branchl) ->
      iter_deps_expr f e;
      List.iter (fun (p, e) -> iter_deps_pat f p; iter_deps_expr f e) branchl
    | Eif (e1, e2, e3) ->
      iter_deps_expr f e1;
      iter_deps_expr f e2;
      iter_deps_expr f e3
    | Eblock exprl ->
      List.iter (iter_deps_expr f) exprl
    | Ewhile (e1, e2) ->
      iter_deps_expr f e1;
      iter_deps_expr f e2
    | Efor (_, _, _, _, e) ->
      iter_deps_expr f e
    | Eraise (xs, None) ->
      f xs.xs_name
    | Eraise (xs, Some e) ->
      f xs.xs_name;
      iter_deps_expr f e
    | Etry (e, xbranchl) ->
      iter_deps_expr f e;
      List.iter (iter_deps_xbranch f) xbranchl
    | Eassign assingl ->
      List.iter (fun (_, rs, _) -> f rs.rs_name) assingl

Mário Pereira's avatar
Mário Pereira committed
265
  let iter_deps f = function
Mário Pereira's avatar
Mário Pereira committed
266 267
    | Dtype its_dl ->
      List.iter (iter_deps_its_defn f) its_dl
Mário Pereira's avatar
Mário Pereira committed
268 269 270 271 272 273 274 275 276
    | Dlet (Lsym (_rs, ty_result, args, e)) ->
      iter_deps_ty f ty_result;
      iter_deps_args f args;
      iter_deps_expr f e
    | Dlet (Lrec rdef) ->
      List.iter
        (fun {rec_sym = rs; rec_args = args; rec_exp = e; rec_res = res} ->
           f rs.rs_name; iter_deps_args f args;
           iter_deps_expr f e; iter_deps_ty f res) rdef
Mário Pereira's avatar
Mário Pereira committed
277
    | _ -> assert false (*TODO*)
278

279
  let mk_expr e_node e_ity e_effect =
Mário Pereira's avatar
Mário Pereira committed
280 281
    { e_node = e_node; e_ity = e_ity; e_effect = e_effect }

282
  (* smart constructors *)
Mário Pereira's avatar
Mário Pereira committed
283
  let mk_let_var pv e1 e2 =
Mário Pereira's avatar
Mário Pereira committed
284
    Elet (Lvar (pv, e1), e2)
Mário Pereira's avatar
Mário Pereira committed
285 286

  let tunit = Ttuple []
287

Mário Pereira's avatar
Mário Pereira committed
288 289
  let ity_int  = I ity_int
  let ity_unit = I ity_unit
Mário Pereira's avatar
Mário Pereira committed
290

291 292 293 294 295
  let enope = Eblock []

  let mk_unit =
    mk_expr enope (I Ity.ity_unit) Ity.eff_empty

296 297
  let mk_var id ty ghost = (id, ty, ghost)

298 299
  let mk_var_unit () = id_register (id_fresh "_"), tunit, true

300 301 302
  let mk_its_defn id args private_ def =
    { its_name = id; its_args = args; its_private = private_; its_def = def; }

303 304 305 306 307 308 309 310
  let eseq e1 e2 =
    match e1.e_node, e2.e_node with
    | Eblock [], e | e, Eblock [] -> e
    | Eblock e1, Eblock e2 -> Eblock (e1 @ e2)
    | _, Eblock e2 -> Eblock (e1 :: e2)
    | Eblock e1, _ -> Eblock (e1 @ [e2])
    | _ -> Eblock [e1; e2]

311
end
Mário Pereira's avatar
Mário Pereira committed
312 313 314 315 316

(** Translation from Mlw to ML *)

module Translate = struct

Mário Pereira's avatar
Mário Pereira committed
317 318 319
  open Expr
  open Pmodule
  open Pdecl
Mário Pereira's avatar
Mário Pereira committed
320

Mário Pereira's avatar
Mário Pereira committed
321 322 323 324 325
  type info = {
    info_current_mo   : Pmodule.pmodule option;
    info_mo_known_map : Pdecl.known_map;
  }

Mário Pereira's avatar
Mário Pereira committed
326 327 328
  (* useful predicates and transformations *)
  let pv_not_ghost e = not e.pv_ghost

Mário Pereira's avatar
Mário Pereira committed
329 330 331 332
  (* types *)
  let rec type_ ty =
    match ty.ty_node with
    | Tyvar tvs ->
333
       ML.Tvar tvs
Mário Pereira's avatar
Mário Pereira committed
334 335 336 337 338 339 340 341
    | Tyapp (ts, tyl) when is_ts_tuple ts ->
       ML.Ttuple (List.map type_ tyl)
    | Tyapp (ts, tyl) ->
       ML.Tapp (ts.ts_name, List.map type_ tyl)

  let vsty vs =
    vs.vs_name, type_ vs.vs_ty

342 343 344
  let type_args = (* point-free *)
    List.map (fun x -> x.tv_name)

Mário Pereira's avatar
Mário Pereira committed
345 346 347 348 349
  let rec filter_ghost_params p def = function
    | [] -> []
    | pv :: l ->
      if p pv then def pv :: (filter_ghost_params p def l)
      else filter_ghost_params p def l
350 351 352 353 354 355 356 357 358 359 360 361

  let filter2_ghost_params p def al l =
    let rec filter2_ghost_params_cps l k =
      match l with
      | []  -> k []
      | [e] -> k (if p e then [def e] else [al e])
      | e :: r ->
        filter2_ghost_params_cps r
          (fun fr -> k (if p e then (def e) :: fr else fr))
    in
    filter2_ghost_params_cps l (fun x -> x)

Mário Pereira's avatar
Mário Pereira committed
362 363 364 365 366 367
  let rec filter_ghost_rdef def = function
    | [] -> []
    | { rec_sym = rs; rec_rsym = rrs } :: l
      when rs_ghost rs || rs_ghost rrs -> filter_ghost_rdef def l
    | rdef :: l -> def rdef :: filter_ghost_rdef def l

368 369 370
  let rec pat p =
    match p.pat_node with
    | Pwild ->
371
      ML.Pwild
372
    | Pvar vs ->
373
      ML.Pident vs.vs_name
374
    | Por (p1, p2) ->
375
      ML.Por (pat p1, pat p2)
376
    | Pas (p, vs) ->
377
      ML.Pas (pat p, vs.vs_name)
378
    | Papp (ls, pl) when is_fs_tuple ls ->
379
      ML.Ptuple (List.map pat pl)
380
    | Papp (ls, pl) ->
381 382 383 384 385 386
      let rs = restore_rs ls in
      let args = rs.rs_cty.cty_args in
      let pat_pl = List.fold_left2
          (fun acc pv pp -> if not pv.pv_ghost then (pat pp) :: acc else acc)
          [] args pl
      in
Mário Pereira's avatar
Mário Pereira committed
387
      ML.Papp (ls, List.rev pat_pl)
388

Mário Pereira's avatar
Mário Pereira committed
389 390
  (** programs *)

391 392 393 394 395
  let pv_name pv = pv.pv_vs.vs_name

  let is_underscore pv =
    (pv_name pv).id_string = "_" && ity_equal pv.pv_ity ity_unit

396 397 398
  (* individual types *)
  let rec ity t =
    match t.ity_node with
399
    | Ityvar (tvs, _) ->
400
      ML.Tvar tvs
401
    | Ityapp ({its_ts = ts}, itl, _) when is_ts_tuple ts ->
402
      ML.Ttuple (List.map ity itl)
403
    | Ityapp ({its_ts = ts}, itl, _) ->
404 405 406 407
      ML.Tapp (ts.ts_name, List.map ity itl)
    | Ityreg {reg_its = its; reg_args = args} ->
      let args = List.map ity args in
      ML.Tapp (its.its_ts.ts_name, args)
Mário Pereira's avatar
Mário Pereira committed
408

Mário Pereira's avatar
Mário Pereira committed
409
  let pvty pv =
410 411 412 413 414
    if pv.pv_ghost then
      ML.mk_var (pv_name pv) ML.tunit true
    else
      let (vs, vs_ty) = vsty pv.pv_vs in
      ML.mk_var vs vs_ty false
Mário Pereira's avatar
Mário Pereira committed
415

416 417 418 419
  let for_direction = function
    | To -> ML.To
    | DownTo -> ML.DownTo

Mário Pereira's avatar
Mário Pereira committed
420 421 422 423 424 425 426 427
  let isconstructor info rs =
    match Mid.find_opt rs.rs_name info.info_mo_known_map with
    | Some {pd_node = PDtype its} ->
      let is_constructor its =
        List.exists (rs_equal rs) its.itd_constructors in
      List.exists is_constructor its
    | _ -> false

Mário Pereira's avatar
Mário Pereira committed
428
  let mk_eta_expansion rsc pvl cty_app =
Mário Pereira's avatar
Mário Pereira committed
429 430 431 432 433
    (* FIXME : effects and types of the expression in this situation *)
    let args_f =
      let def pv = pv_name pv, ity pv.pv_ity, pv.pv_ghost in
      filter_ghost_params pv_not_ghost def cty_app.cty_args in
    let args =
434
      let def pv = ML.mk_expr (ML.Evar pv) (ML.I pv.pv_ity) eff_empty in
Mário Pereira's avatar
Mário Pereira committed
435 436 437 438 439 440 441 442 443
      let args = filter_ghost_params pv_not_ghost def pvl in
      let extra_args =
        (* FIXME : ghost status in this extra arguments *)
        List.map def cty_app.cty_args in
      args @ extra_args in
    let eapp =
      ML.mk_expr (ML.Eapp (rsc, args)) (ML.C cty_app) cty_app.cty_effect in
    ML.mk_expr (ML.Efun (args_f, eapp)) (ML.C cty_app) cty_app.cty_effect

444 445 446 447 448 449
  (* function arguments *)
  let filter_params args =
    let args = List.map pvty args in
    let p (_, _, is_ghost) = not is_ghost in
    List.filter p args

Mário Pereira's avatar
Mário Pereira committed
450 451 452 453
  let params = function
    | []   -> []
    | args -> let args = filter_params args in
      if args = [] then [ML.mk_var_unit ()] else args
454

Mário Pereira's avatar
Mário Pereira committed
455 456 457 458 459 460 461 462 463 464 465 466 467 468 469
  let filter_params_cty p def pvl cty_args =
    if List.length pvl <> List.length cty_args then
      raise (Invalid_argument "Different size lists.@.");
    let rec loop = function
      | [], [] -> []
      | pv :: l1, arg :: l2 ->
        if p pv && p arg then def pv :: loop (l1, l2)
        else loop (l1, l2)
      | _ -> assert false
    in loop (pvl, cty_args)

  let app pvl cty_args =
    let def pv = ML.mk_expr (ML.Evar pv) (ML.I pv.pv_ity) eff_empty in
    filter_params_cty pv_not_ghost def pvl cty_args

Mário Pereira's avatar
Mário Pereira committed
470
  let mk_for op_b_rs op_a_rs i_pv from_pv to_pv body_expr eff =
Mário Pereira's avatar
Mário Pereira committed
471 472 473 474 475 476
    let i_expr, from_expr, to_expr =
      let int_ity = ML.ity_int in let eff_e = eff_empty in
      ML.mk_expr (ML.Evar i_pv)     int_ity eff_e,
      ML.mk_expr (ML.Evar from_pv)  int_ity eff_e,
      ML.mk_expr (ML.Evar to_pv)    int_ity eff_e in
    let for_rs    =
Mário Pereira's avatar
Mário Pereira committed
477
      let for_id  = id_fresh "for_loop_to" in
Mário Pereira's avatar
Mário Pereira committed
478
      let for_cty = create_cty [i_pv; to_pv] [] [] Mxs.empty
Mário Pereira's avatar
Mário Pereira committed
479
                               Mpv.empty eff ity_unit in
Mário Pereira's avatar
Mário Pereira committed
480 481 482
      create_rsymbol for_id for_cty in
    let for_expr =
      let test = ML.mk_expr (ML.Eapp (op_b_rs, [i_expr; to_expr]))
Mário Pereira's avatar
Mário Pereira committed
483 484
                            (ML.I ity_bool) eff_empty in
      let next_expr =
Mário Pereira's avatar
Mário Pereira committed
485
        let one_const = Number.int_const_dec "1" in
Mário Pereira's avatar
Mário Pereira committed
486
        let one_expr  =
Mário Pereira's avatar
Mário Pereira committed
487
          ML.mk_expr (ML.Econst one_const) ML.ity_int eff_empty in
Mário Pereira's avatar
Mário Pereira committed
488 489
        let i_op_one = ML.Eapp (op_a_rs, [i_expr; one_expr]) in
        ML.mk_expr i_op_one ML.ity_int eff_empty in
Mário Pereira's avatar
Mário Pereira committed
490
       let rec_call  =
Mário Pereira's avatar
Mário Pereira committed
491
        ML.mk_expr (ML.Eapp (for_rs, [next_expr; to_expr]))
Mário Pereira's avatar
Mário Pereira committed
492
                    ML.ity_unit eff in
Mário Pereira's avatar
Mário Pereira committed
493
      let seq_expr =
Mário Pereira's avatar
Mário Pereira committed
494
        ML.mk_expr (ML.eseq body_expr rec_call) ML.ity_unit eff in
Mário Pereira's avatar
Mário Pereira committed
495 496
      ML.mk_expr (ML.Eif (test, seq_expr, ML.mk_unit)) ML.ity_unit eff in
    let ty_int = ity ity_int in
Mário Pereira's avatar
Mário Pereira committed
497
    let for_call_expr   =
Mário Pereira's avatar
Mário Pereira committed
498
      let for_call      = ML.Eapp (for_rs, [from_expr; to_expr]) in
Mário Pereira's avatar
Mário Pereira committed
499 500
      ML.mk_expr for_call ML.ity_unit eff in
    let pv_name pv = pv.pv_vs.vs_name in
Mário Pereira's avatar
Mário Pereira committed
501
    let args = [
Mário Pereira's avatar
Mário Pereira committed
502 503
      (pv_name  i_pv, ty_int, false);
      (pv_name to_pv, ty_int, false);
Mário Pereira's avatar
Mário Pereira committed
504
    ] in
Mário Pereira's avatar
Mário Pereira committed
505
    let for_rec_def = {
Mário Pereira's avatar
Mário Pereira committed
506 507
      ML.rec_sym  = for_rs; ML.rec_args = args;
      ML.rec_rsym = for_rs; ML.rec_exp  = for_expr;
Mário Pereira's avatar
Mário Pereira committed
508
      ML.rec_res  = ML.tunit;
Mário Pereira's avatar
Mário Pereira committed
509
    } in
Mário Pereira's avatar
Mário Pereira committed
510
    let for_let = ML.Elet (ML.Lrec [for_rec_def], for_call_expr) in
Mário Pereira's avatar
Mário Pereira committed
511 512 513 514 515 516 517 518 519 520 521 522 523 524
    ML.mk_expr for_let ML.ity_unit eff

  let mk_for_downto info i_pv from_pv to_pv body eff =
    let ge_rs, minus_rs =
      let ns = (Opt.get info.info_current_mo).mod_export in
      ns_find_rs ns ["Int"; "infix >="], ns_find_rs ns ["Int"; "infix -"] in
    mk_for ge_rs minus_rs i_pv from_pv to_pv body eff

  let mk_for_to info i_pv from_pv to_pv body eff =
    let le_rs, plus_rs =
      let ns = (Opt.get info.info_current_mo).mod_export in
      ns_find_rs ns ["Int"; "infix <="], ns_find_rs ns ["Int"; "infix +"] in
    mk_for le_rs plus_rs i_pv from_pv to_pv body eff

Mário Pereira's avatar
Mário Pereira committed
525 526
  exception ExtractionAny

Mário Pereira's avatar
Mário Pereira committed
527
  (* expressions *)
528
  let rec expr info ({e_effect = eff} as e) =
Mário Pereira's avatar
Mário Pereira committed
529
    assert (not eff.eff_ghost);
Mário Pereira's avatar
Mário Pereira committed
530
    match e.e_node with
531
    | Econst c ->
Mário Pereira's avatar
Mário Pereira committed
532 533
      let c = match c with Number.ConstInt c -> c | _ -> assert false in
      ML.mk_expr (ML.Econst c) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
534
    | Evar pvs ->
535
      ML.mk_expr (ML.Evar pvs) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
536
    | Elet (LDvar (pv, e1), e2) when e_ghost e1 || pv.pv_ghost ->
Mário Pereira's avatar
Mário Pereira committed
537
      expr info e2
Mário Pereira's avatar
Mário Pereira committed
538 539 540 541
    | Elet (LDvar (pv, e1), e2) when is_underscore pv && e_ghost e2 ->
      expr info e1
    | Elet (LDvar (pv, e1), e2) when is_underscore pv ->
      ML.mk_expr (ML.eseq (expr info e1) (expr info e2)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
542
    | Elet (LDvar (pvs, e1), e2) ->
Mário Pereira's avatar
Mário Pereira committed
543
      let ml_let = ML.mk_let_var pvs (expr info e1) (expr info e2) in
544 545
      ML.mk_expr ml_let (ML.I e.e_ity) eff
    | Elet (LDsym (rs, {c_node = Cfun ef; c_cty = cty}), ein) ->
546
      let args = params cty.cty_args in
547 548
      let ef = expr info ef in
      let ein = expr info ein in
Mário Pereira's avatar
Mário Pereira committed
549 550
      let res = ity cty.cty_result in
      let ml_letrec = ML.Elet (ML.Lsym (rs, res, args, ef), ein) in
551
      ML.mk_expr ml_letrec (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
552 553
    | Elet (LDsym (rsf, {c_node = Capp (rs_app, pvl); c_cty = cty}), ein)
      when isconstructor info rs_app ->
Mário Pereira's avatar
Mário Pereira committed
554 555
      (* partial application of constructor *)
      let eta_app = mk_eta_expansion rs_app pvl cty in
Mário Pereira's avatar
Mário Pereira committed
556
      let ein = expr info ein in
Mário Pereira's avatar
Mário Pereira committed
557 558 559
      let mk_func pv f = ity_func pv.pv_ity f in
      let func = List.fold_right mk_func cty.cty_args cty.cty_result in
      let res = ity func in
Mário Pereira's avatar
Mário Pereira committed
560
      let ml_letrec = ML.Elet (ML.Lsym (rsf, res, [], eta_app), ein) in
Mário Pereira's avatar
Mário Pereira committed
561 562
      ML.mk_expr ml_letrec (ML.I e.e_ity) e.e_effect
    | Elet (LDsym (rsf, {c_node = Capp (rs_app, pvl); c_cty = cty}), ein) ->
563
      (* partial application *)
Mário Pereira's avatar
Mário Pereira committed
564
      let pvl = app pvl rsf.rs_cty.cty_args in
565
      let eapp =
Mário Pereira's avatar
Mário Pereira committed
566
        ML.mk_expr (ML.Eapp (rs_app, pvl)) (ML.C cty) cty.cty_effect in
Mário Pereira's avatar
Mário Pereira committed
567 568
      let ein  = expr info ein in
      let res  = ity cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
569
      let args = params cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
570
      let ml_letrec = ML.Elet (ML.Lsym (rsf, res, args, eapp), ein) in
Mário Pereira's avatar
Mário Pereira committed
571 572 573 574
      ML.mk_expr ml_letrec (ML.I e.e_ity) e.e_effect
    | Elet (LDrec rdefl, ein) ->
      let ein = expr info ein in
      let rdefl =
Mário Pereira's avatar
Mário Pereira committed
575
        List.map (fun rdef -> match rdef with
Mário Pereira's avatar
Mário Pereira committed
576 577
          | {rec_sym = rs1; rec_rsym = rs2;
             rec_fun = {c_node = Cfun ef; c_cty = cty}} ->
Mário Pereira's avatar
Mário Pereira committed
578
            let res  = ity rs1.rs_cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
579 580
            let args = params cty.cty_args in let ef = expr info ef in
            { ML.rec_sym  = rs1;  ML.rec_rsym = rs2;
Mário Pereira's avatar
Mário Pereira committed
581
              ML.rec_args = args; ML.rec_exp  = ef ; ML.rec_res  = res }
Mário Pereira's avatar
Mário Pereira committed
582 583 584
          | _ -> assert false) rdefl
      in
      let ml_letrec = ML.Elet (ML.Lrec rdefl, ein) in
585
      ML.mk_expr ml_letrec (ML.I e.e_ity) e.e_effect
586 587 588 589
    | Eexec ({c_node = Capp (rs, [])}, _) when is_rs_tuple rs ->
      ML.mk_unit
    | Eexec ({c_node = Capp (rs, _)}, _) when rs_ghost rs ->
      ML.mk_unit
Mário Pereira's avatar
Mário Pereira committed
590
    | Eexec ({c_node = Capp (rs, pvl); c_cty = cty}, _)
Mário Pereira's avatar
Mário Pereira committed
591 592
      when isconstructor info rs && cty.cty_args <> [] ->
      (* partial application of constructors *)
Mário Pereira's avatar
Mário Pereira committed
593
      mk_eta_expansion rs pvl cty
Mário Pereira's avatar
Mário Pereira committed
594
    | Eexec ({c_node = Capp (rs, pvl); _}, _) ->
Mário Pereira's avatar
Mário Pereira committed
595
      let pvl = app pvl rs.rs_cty.cty_args in
596
      ML.mk_expr (ML.Eapp (rs, pvl)) (ML.I e.e_ity) eff
597
    | Eexec ({c_node = Cfun e; c_cty = cty}, _) ->
598
      let args = params cty.cty_args in
599
      ML.mk_expr (ML.Efun (args, expr info e)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
600 601
    | Eexec ({c_node = Cany}, _) -> (* raise ExtractionAny *)
      ML.mk_unit
602
    | Eabsurd ->
603 604 605
      ML.mk_expr ML.Eabsurd (ML.I e.e_ity) eff
    | Ecase (e1, _) when e_ghost e1 ->
      ML.mk_unit
606
    | Ecase (e1, pl) ->
Mário Pereira's avatar
Mário Pereira committed
607 608 609
      let e1 = expr info e1 in
      let pl = List.map (ebranch info) pl in
      ML.mk_expr (ML.Ematch (e1, pl)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
610
    | Eassert _ -> (* ML.mk_expr ML.Ehole ML.ity_unit eff *)
Mário Pereira's avatar
Mário Pereira committed
611
      ML.mk_unit
612
    | Eif (e1, e2, e3) ->
Mário Pereira's avatar
Mário Pereira committed
613 614 615 616
      let e1 = expr info e1 in
      let e2 = expr info e2 in
      let e3 = expr info e3 in
      ML.mk_expr (ML.Eif (e1, e2, e3)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
617 618 619 620
    | Ewhile (e1, _, _, e2) ->
      let e1 = expr info e1 in
      let e2 = expr info e2 in
      ML.mk_expr (ML.Ewhile (e1, e2)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
621
    | Efor (pv1, (pv2, To, pv3), _, efor) ->
Mário Pereira's avatar
Mário Pereira committed
622
      let efor = expr info efor in
Mário Pereira's avatar
Mário Pereira committed
623 624 625 626
      mk_for_to info pv1 pv2 pv3 efor eff
    | Efor (pv1, (pv2, DownTo, pv3), _, efor) ->
      let efor = expr info efor in
      mk_for_downto info pv1 pv2 pv3 efor eff
Mário Pereira's avatar
Mário Pereira committed
627
    | Eghost _ -> assert false
628 629 630
    | Eassign al ->
      ML.mk_expr (ML.Eassign al) (ML.I e.e_ity) eff
    | Epure _ -> assert false (*TODO*)
Mário Pereira's avatar
Mário Pereira committed
631 632 633 634 635 636
    | Etry (etry, pvl_e_map) ->
      let etry = expr info etry in
      let bl   =
        let bl_map = Mxs.bindings pvl_e_map in
        List.map (fun (xs, (pvl, e)) -> xs, pvl, expr info e) bl_map in
      ML.mk_expr (ML.Etry (etry, bl)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
637 638 639
    | Eraise (xs, ex) ->
      let ex =
        match expr info ex with
Mário Pereira's avatar
Mário Pereira committed
640
        | {ML.e_node = ML.Eblock []} -> None
Mário Pereira's avatar
Mário Pereira committed
641 642
        | e -> Some e
      in
Mário Pereira's avatar
Mário Pereira committed
643
      ML.mk_expr (ML.Eraise (xs, ex)) (ML.I e.e_ity) eff
644 645 646 647 648
    | Elet (LDsym (_, {c_node=(Cany|Cpur (_, _)); _ }), _) ->
      assert false (*TODO*)
    | Eexec ({c_node=Cpur (_, _); _ }, _) ->
      assert false (*TODO*)

Mário Pereira's avatar
Mário Pereira committed
649 650
  and ebranch info ({pp_pat = p}, e) =
    (pat p, expr info e)
651

652 653 654 655
  let its_args ts = ts.its_ts.ts_args
  let itd_name td = td.itd_its.its_ts.ts_name

  (* type declarations/definitions *)
Mário Pereira's avatar
Mário Pereira committed
656
  let tdef itd =
657
    let s = itd.itd_its in
658 659 660
    let ddata_constructs = (* point-free *)
      List.map (fun ({rs_cty = rsc} as rs) ->
          rs.rs_name,
Mário Pereira's avatar
Mário Pereira committed
661
          let args = List.filter pv_not_ghost rsc.cty_args in
662 663
          List.map (fun {pv_vs = vs} -> type_ vs.vs_ty) args)
    in
Mário Pereira's avatar
Mário Pereira committed
664 665 666 667
    let drecord_fields ({rs_cty = rsc} as rs) = (* point-free *)
      (List.exists (pv_equal (Opt.get rs.rs_field)) s.its_mfields),
      rs.rs_name,
      ity rsc.cty_result
668 669 670 671
    in
    let id = s.its_ts.ts_name in
    let is_private = s.its_private in
    let args = s.its_ts.ts_args in
672 673
    begin match s.its_def, itd.itd_constructors, itd.itd_fields with
      | None, [], [] ->
Mário Pereira's avatar
Mário Pereira committed
674
        ML.mk_its_defn id args is_private None
675
      | None, cl, [] ->
Mário Pereira's avatar
Mário Pereira committed
676 677
        let cl = ddata_constructs cl in
        ML.mk_its_defn id args is_private (Some (ML.Ddata cl))
678
      | None, _, pjl ->
Mário Pereira's avatar
Mário Pereira committed
679 680 681
        let p e = not (rs_ghost e) in
        let pjl = filter_ghost_params p drecord_fields pjl in
        ML.mk_its_defn id args is_private (Some (ML.Drecord pjl))
682
      | Some t, _, _ ->
683
         ML.mk_its_defn id args is_private (Some (ML.Dalias (ity t)))
684
    end
Mário Pereira's avatar
Mário Pereira committed
685

Mário Pereira's avatar
Mário Pereira committed
686
  exception ExtractionVal of rsymbol
Mário Pereira's avatar
Mário Pereira committed
687

Mário Pereira's avatar
Mário Pereira committed
688
  (* program declarations *)
689
  let pdecl info pd =
Mário Pereira's avatar
Mário Pereira committed
690
    match pd.pd_node with
691
    | PDlet (LDsym (rs, _)) when rs_ghost rs ->
Mário Pereira's avatar
Mário Pereira committed
692
      []
Mário Pereira's avatar
Mário Pereira committed
693 694 695
    | PDlet (LDsym (_rs, {c_node = Cany})) ->
      []
      (* raise (ExtractionVal _rs) *)
696
    | PDlet (LDsym ({rs_cty = cty} as rs, {c_node = Cfun e})) ->
697
      let args = params cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
698 699 700 701
      let res  = ity cty.cty_result in
      let decl = ML.Dlet (ML.Lsym (rs, res, args, expr info e)) in
      let add_known = Mid.singleton rs.rs_name decl in
      [decl, add_known]
702
    | PDlet (LDrec rl) ->
Mário Pereira's avatar
Mário Pereira committed
703
      let def {rec_fun = e; rec_sym = rs1; rec_rsym = rs2} =
Mário Pereira's avatar
Mário Pereira committed
704
        let e    = match e.c_node with Cfun e -> e | _ -> assert false in
Mário Pereira's avatar
Mário Pereira committed
705
        let args = params rs1.rs_cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
706
        let res  = ity rs1.rs_cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
707
        { ML.rec_sym  = rs1;  ML.rec_rsym = rs2;
Mário Pereira's avatar
Mário Pereira committed
708 709
          ML.rec_args = args; ML.rec_exp  = expr info e;
          ML.rec_res  = res } in
Mário Pereira's avatar
Mário Pereira committed
710
      let rec_def = filter_ghost_rdef def rl in
Mário Pereira's avatar
Mário Pereira committed
711 712 713 714 715
      let decl    = ML.Dlet (ML.Lrec rec_def) in
      let mk_add_km m {ML.rec_sym = rs} =
        ML.add_known_decl rs.rs_name decl m in
      let add_known = List.fold_left mk_add_km Mid.empty rec_def in
      [decl, add_known]
Mário Pereira's avatar
Mário Pereira committed
716
    | PDlet (LDsym _) | PDpure | PDlet (LDvar (_, _)) ->
717
      []
718
    | PDtype itl ->
Mário Pereira's avatar
Mário Pereira committed
719 720 721 722 723
      let itsd = List.map tdef itl in
      let decl = ML.Dtype itsd in
      let mk_add_mk m {ML.its_name = id} = ML.add_known_decl id decl m in
      let add_known = List.fold_left mk_add_mk Mid.empty itsd in
      [decl, add_known]
724
    | PDexn xs ->
Mário Pereira's avatar
Mário Pereira committed
725 726 727 728
      let decl = if ity_equal xs.xs_ity ity_unit then ML.Dexn (xs, None)
        else ML.Dexn (xs, Some (ity xs.xs_ity)) in
      let add_known = Mid.singleton xs.xs_name decl in
      [decl, add_known]
Mário Pereira's avatar
Mário Pereira committed
729

Mário Pereira's avatar
Mário Pereira committed
730 731 732 733 734 735
  let pdecl_m m pd =
    let info = {
      info_current_mo   = Some m;
      info_mo_known_map = m.mod_known; } in
    pdecl info pd

Mário Pereira's avatar
Mário Pereira committed
736
  (* unit module declarations *)
737
  let mdecl info = function
Mário Pereira's avatar
Mário Pereira committed
738
    | Udecl pd ->
739
       pdecl info pd
740
    |  _ -> (* TODO *) []
Mário Pereira's avatar
Mário Pereira committed
741 742

  (* modules *)
Mário Pereira's avatar
Mário Pereira committed
743 744 745 746
  let module_ m =
    let info = {
      info_current_mo   = Some m;
      info_mo_known_map = m.mod_known; } in
Mário Pereira's avatar
Mário Pereira committed
747 748 749 750 751 752 753
    let known_m = ref Mid.empty in
    let mk_decl_and_km (decl, known_m_new) =
      known_m := Mid.set_union !known_m known_m_new;
      decl in
    let comp munit =
      let m = mdecl info munit in List.map mk_decl_and_km m in
    let decl = List.map comp m.mod_units in
Mário Pereira's avatar
Mário Pereira committed
754
    { ML.mod_decl = List.concat decl; ML.mod_known = !known_m }, info
Mário Pereira's avatar
Mário Pereira committed
755

Mário Pereira's avatar
Mário Pereira committed
756 757 758 759 760 761 762 763
  let () = Exn_printer.register (fun fmt e -> match e with
    | ExtractionAny ->
      Format.fprintf fmt "Cannot extract an undefined node"
    | ExtractionVal rs ->
      Format.fprintf fmt "Function %a cannot be extracted"
        print_rs rs
    | _ -> raise e)

Mário Pereira's avatar
Mário Pereira committed
764 765
end

766 767 768 769 770 771 772 773
(** Some transformations *)

module Transform = struct

  open ML

  type subst = expr Mpv.t

Mário Pereira's avatar
Mário Pereira committed
774
  let rec expr info subst e =
775
    let mk n = { e with e_node = n } in
Mário Pereira's avatar
Mário Pereira committed
776
    let add_subst pv e1 e2 = expr info (Mpv.add pv e1 subst) e2 in
777 778 779
    match e.e_node with
    | Evar pv ->
      (try Mpv.find pv subst with Not_found -> e)
Mário Pereira's avatar
Mário Pereira committed
780
    | Elet (Lvar (pv, ({e_node = Econst _ } as e1)), e2)
Mário Pereira's avatar
Mário Pereira committed
781
    | Elet (Lvar (pv, ({e_node = Eblock []} as e1)), e2) ->
Mário Pereira's avatar
Mário Pereira committed
782 783 784
      add_subst pv e1 e2
    | Elet (Lvar (pv, ({e_node = Eapp (rs, [])} as e1)), e2)
      when Translate.isconstructor info rs ->
Mário Pereira's avatar
Mário Pereira committed
785
      (* only optimize constructors with no argument *)
Mário Pereira's avatar
Mário Pereira committed
786
      (* because of Lvar we know the constructor is completely applied *)
Mário Pereira's avatar
Mário Pereira committed
787
      add_subst pv e1 e2
788
    | Elet (ld, e) ->
Mário Pereira's avatar
Mário Pereira committed
789
      mk (Elet (let_def info subst ld, expr info subst e))
790
    | Eapp (rs, el) ->
Mário Pereira's avatar
Mário Pereira committed
791
      mk (Eapp (rs, List.map (expr info subst) el))
792
    | Efun (vl, e) ->
Mário Pereira's avatar
Mário Pereira committed
793
      mk (Efun (vl, expr info subst e))
794
    | Eif (e1, e2, e3) ->
Mário Pereira's avatar
Mário Pereira committed
795
      mk (Eif (expr info subst e1, expr info subst e2, expr info subst e3))
Mário Pereira's avatar
Mário Pereira committed
796 797
    (* | Ecast (e, ty) -> *)
    (*   mk (Ecast (expr info subst e, ty)) *)
798
    | Ematch (e, bl) ->
Mário Pereira's avatar
Mário Pereira committed
799
      mk (Ematch (expr info subst e, List.map (branch info subst) bl))
800
    | Eblock el ->
Mário Pereira's avatar
Mário Pereira committed
801
      mk (Eblock (List.map (expr info subst) el))
802
    | Ewhile (e1, e2) ->
Mário Pereira's avatar
Mário Pereira committed
803
      mk (Ewhile (expr info subst e1, expr info subst e2))
804
    | Efor (x, pv1, dir, pv2, e) ->
Mário Pereira's avatar
Mário Pereira committed
805
      let e = mk (Efor (x, pv1, dir, pv2, expr info subst e)) in
806 807 808
      (* be careful when pv1 and pv2 are in subst *)
      mk_let subst pv1 (mk_let subst pv2 e)
    | Eraise (exn, eo) ->
Mário Pereira's avatar
Mário Pereira committed
809
      mk (Eraise (exn, Opt.map (expr info subst) eo))
810
    | Etry (e, bl) ->
Mário Pereira's avatar
Mário Pereira committed
811
      mk (Etry (expr info subst e, List.map (xbranch info subst) bl))
812 813 814 815 816 817 818 819 820 821 822
    | Eassign al ->
      let assign e (_, _, pv) = mk_let subst pv e in
      List.fold_left assign e al
    | Econst _ | Eabsurd -> e

  and mk_let subst pv e =
    try
      let e1 = Mpv.find pv subst in
      { e with e_node = Elet (Lvar (pv, e1), e) }
    with Not_found -> e

Mário Pereira's avatar
Mário Pereira committed
823 824
  and branch info subst (pat, e) = pat, expr info subst e
  and xbranch info subst (exn, pat, e) = exn, pat, expr info subst e
825

Mário Pereira's avatar
Mário Pereira committed
826
  and let_def info subst = function
827 828
    | Lvar (pv, e) ->
      assert (not (Mpv.mem pv subst)); (* no capture *)
Mário Pereira's avatar
Mário Pereira committed
829
      Lvar (pv, expr info subst e)
Mário Pereira's avatar
Mário Pereira committed
830 831
    | Lsym (rs, res, args, e) ->
      Lsym (rs, res, args, expr info subst e)
Mário Pereira's avatar
Mário Pereira committed
832
    | Lrec rl -> Lrec (List.map (rdef info subst) rl)
833

Mário Pereira's avatar
Mário Pereira committed
834 835
  and rdef info subst r =
    { r with rec_exp = expr info subst r.rec_exp }
836

Mário Pereira's avatar
Mário Pereira committed
837
  let pdecl info = function
838
    | Dtype _ | Dexn _ as d -> d
Mário Pereira's avatar
Mário Pereira committed
839
    | Dlet def -> Dlet (let_def info Mpv.empty def)
840

Mário Pereira's avatar
Mário Pereira committed
841 842
  let module_ info m =
    { m with mod_decl = List.map (pdecl info) m.mod_decl }
843 844

end
Mário Pereira's avatar
Mário Pereira committed
845 846 847

(*
 * Local Variables:
848
 * compile-command: "make -C ../.. -j3 bin/why3extract.opt"
Mário Pereira's avatar
Mário Pereira committed
849 850
 * End:
 *)