compile.ml 36 KB
Newer Older
1 2 3
(********************************************************************)
(*                                                                  *)
(*  The Why3 Verification Platform   /   The Why3 Development Team  *)
Mário Pereira's avatar
Mário Pereira committed
4
(*  Copyright 2010-2017   --   INRIA - CNRS - Paris-Sud University  *)
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
(*                                                                  *)
(*  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.                           *)
(*                                                                  *)
(********************************************************************)

(*
  - "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 = ...")
*)

(** Abstract syntax of ML *)

open Ident
open Ity
Mário Pereira's avatar
Mário Pereira committed
25
open Ty
Mário Pereira's avatar
Mário Pereira committed
26
open Term
27

Mário Pereira's avatar
Mário Pereira committed
28 29 30 31 32 33 34 35
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
36
  let fname = match fname, path with
Mário Pereira's avatar
Mário Pereira committed
37 38 39 40 41
    | None, "why3"::_ -> "why3"
    | None, _   -> String.concat "__" path
    | Some f, _ -> clean_name f in
  fname ^ "__" ^ t

42
module ML = struct
43
  open Expr
44
  open Mltree
Mário Pereira's avatar
Mário Pereira committed
45

46
  let rec get_decl_name = function
Mário Pereira's avatar
Mário Pereira committed
47 48
    | Dtype itdefl -> List.map (fun {its_name = id} -> id) itdefl
    | Dlet (Lrec rdef) -> List.map (fun {rec_sym = rs} -> rs.rs_name) rdef
49 50
    | Dlet (Lvar ({pv_vs={vs_name=id}}, _))
    | Dlet (Lsym ({rs_name=id}, _, _, _))
Mário Pereira's avatar
Mário Pereira committed
51
    | Dlet (Lany ({rs_name=id}, _, _))
52
    | Dexn ({xs_name=id}, _) -> [id]
53
    | Dmodule (_, dl) -> List.concat (List.map get_decl_name dl)
Mário Pereira's avatar
Mário Pereira committed
54

55
  let rec add_known_decl decl k_map id =
Mário Pereira's avatar
Mário Pereira committed
56
    match decl with
57
    | Dmodule (_, dl) ->
58 59 60 61 62
      let add_decl k_map d =
        let idl = get_decl_name d in
        List.fold_left (add_known_decl d) k_map idl in
      List.fold_left add_decl k_map dl
    | _ -> Mid.add id decl k_map
Mário Pereira's avatar
Mário Pereira committed
63

Mário Pereira's avatar
Mário Pereira committed
64 65
  let rec iter_deps_ty f = function
    | Tvar _ -> ()
Mário Pereira's avatar
Mário Pereira committed
66
    | Tapp (id, ty_l) -> f id; List.iter (iter_deps_ty f) ty_l
Mário Pereira's avatar
Mário Pereira committed
67 68 69
    | Ttuple ty_l -> List.iter (iter_deps_ty f) ty_l

  let iter_deps_typedef f = function
Mário Pereira's avatar
Mário Pereira committed
70 71
    | Ddata constrl ->
      List.iter (fun (_, tyl) -> List.iter (iter_deps_ty f) tyl) constrl
Mário Pereira's avatar
Mário Pereira committed
72
    | Drecord pjl -> List.iter (fun (_, _, ty) -> iter_deps_ty f ty) pjl
Mário Pereira's avatar
Mário Pereira committed
73 74 75 76 77
    | 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
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
  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
Mário Pereira's avatar
Mário Pereira committed
100
    | Econst _ | Evar _ | Eabsurd | Ehole -> ()
Mário Pereira's avatar
Mário Pereira committed
101 102
    | Eapp (rs, exprl) ->
      f rs.rs_name; List.iter (iter_deps_expr f) exprl
Mário Pereira's avatar
Mário Pereira committed
103 104 105
    | Efun (args, e) ->
      List.iter (fun (_, ty_arg, _) -> iter_deps_ty f ty_arg) args;
      iter_deps_expr f e
Mário Pereira's avatar
Mário Pereira committed
106 107 108 109 110 111 112 113
    | 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
Mário Pereira's avatar
Mário Pereira committed
114 115 116 117
    | Elet (Lany (_, ty_result, args), e2) ->
      iter_deps_ty f ty_result;
      List.iter (fun (_, ty_arg, _) -> iter_deps_ty f ty_arg) args;
      iter_deps_expr f e2
Mário Pereira's avatar
Mário Pereira committed
118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
    | 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
143 144 145 146 147
    | Eexn (_xs, None, e) -> (* FIXME? How come we never do binding here? *)
      iter_deps_expr f e
    | Eexn (_xs, Some ty, e) -> (* FIXME? How come we never do binding here? *)
      iter_deps_ty f ty;
      iter_deps_expr f e
Mário Pereira's avatar
Mário Pereira committed
148 149 150 151 152
    | 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
153
    | Eignore e -> iter_deps_expr f e
Mário Pereira's avatar
Mário Pereira committed
154

155
  let rec iter_deps f = function
Mário Pereira's avatar
Mário Pereira committed
156 157
    | Dtype its_dl ->
      List.iter (iter_deps_its_defn f) its_dl
Mário Pereira's avatar
Mário Pereira committed
158 159 160 161
    | Dlet (Lsym (_rs, ty_result, args, e)) ->
      iter_deps_ty f ty_result;
      iter_deps_args f args;
      iter_deps_expr f e
Mário Pereira's avatar
Mário Pereira committed
162 163 164
    | Dlet (Lany (_rs, ty_result, args)) ->
      iter_deps_ty f ty_result;
      iter_deps_args f args
Mário Pereira's avatar
Mário Pereira committed
165 166 167 168 169
    | 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
170 171 172
    | Dlet (Lvar (_, e)) -> iter_deps_expr f e
    | Dexn (_, None) -> ()
    | Dexn (_, Some ty) -> iter_deps_ty f ty
173
    | Dmodule (_, dl) -> List.iter (iter_deps f) dl
174

Mário Pereira's avatar
Mário Pereira committed
175 176
  let mk_expr e_node e_ity e_effect e_label =
    { e_node = e_node; e_ity = e_ity; e_effect = e_effect; e_label = e_label; }
Mário Pereira's avatar
Mário Pereira committed
177

178
  (* smart constructors *)
Mário Pereira's avatar
Mário Pereira committed
179
  let mk_let_var pv e1 e2 =
Mário Pereira's avatar
Mário Pereira committed
180
    Elet (Lvar (pv, e1), e2)
Mário Pereira's avatar
Mário Pereira committed
181 182

  let tunit = Ttuple []
183

Mário Pereira's avatar
Mário Pereira committed
184 185 186 187 188 189
  let ity_int  = I Ity.ity_int
  let ity_unit = I Ity.ity_unit

  let is_unit = function
    | I i -> ity_equal i Ity.ity_unit
    | _ -> false
Mário Pereira's avatar
Mário Pereira committed
190

191 192 193
  let enope = Eblock []

  let mk_unit =
Mário Pereira's avatar
Mário Pereira committed
194
    mk_expr enope (I Ity.ity_unit) Ity.eff_empty Slab.empty
195

Mário Pereira's avatar
Mário Pereira committed
196
  let mk_hole =
Mário Pereira's avatar
Mário Pereira committed
197
    mk_expr Ehole (I Ity.ity_unit) Ity.eff_empty Slab.empty
Mário Pereira's avatar
Mário Pereira committed
198

199 200
  let mk_var id ty ghost = (id, ty, ghost)

201 202
  let mk_var_unit () = id_register (id_fresh "_"), tunit, true

203
  let mk_its_defn id args private_ def =
Mário Pereira's avatar
Mário Pereira committed
204 205
    { its_name    = id      ; its_args = args;
      its_private = private_; its_def  = def; }
206

Mário Pereira's avatar
Mário Pereira committed
207 208
  let mk_ignore e =
    if is_unit e.e_ity then e
Mário Pereira's avatar
Mário Pereira committed
209
    else mk_expr (Eignore e) ity_unit e.e_effect e.e_label
Mário Pereira's avatar
Mário Pereira committed
210

211 212
  let eseq e1 e2 =
    match e1.e_node, e2.e_node with
Mário Pereira's avatar
Mário Pereira committed
213
    | (Eblock [] | Ehole), e | e, (Eblock [] | Ehole) -> e
214 215 216 217 218
    | Eblock e1, Eblock e2 -> Eblock (e1 @ e2)
    | _, Eblock e2 -> Eblock (e1 :: e2)
    | Eblock e1, _ -> Eblock (e1 @ [e2])
    | _ -> Eblock [e1; e2]

219
end
Mário Pereira's avatar
Mário Pereira committed
220 221 222 223 224

(** Translation from Mlw to ML *)

module Translate = struct

Mário Pereira's avatar
Mário Pereira committed
225 226 227
  open Expr
  open Pmodule
  open Pdecl
Mário Pereira's avatar
Mário Pereira committed
228

Mário Pereira's avatar
Mário Pereira committed
229 230 231
  (* useful predicates and transformations *)
  let pv_not_ghost e = not e.pv_ghost

Mário Pereira's avatar
Mário Pereira committed
232 233
  (* remove ghost components from tuple, using mask *)
  let visible_of_mask m sl = match m with
Mário Pereira's avatar
Mário Pereira committed
234
    | MaskGhost    -> assert false (* FIXME ? *)
Mário Pereira's avatar
Mário Pereira committed
235 236 237 238 239 240
    | MaskVisible  -> sl
    | MaskTuple ml ->
      let add_ity acc m ity = if mask_ghost m then acc else ity :: acc in
      if List.length sl < List.length ml then sl (* FIXME ? much likely... *)
      else List.fold_left2 add_ity [] ml sl

Mário Pereira's avatar
Mário Pereira committed
241 242 243 244
  (* types *)
  let rec type_ ty =
    match ty.ty_node with
    | Tyvar tvs ->
245
       Mltree.Tvar tvs
Mário Pereira's avatar
Mário Pereira committed
246
    | Tyapp (ts, tyl) when is_ts_tuple ts ->
247
       Mltree.Ttuple (List.map type_ tyl)
Mário Pereira's avatar
Mário Pereira committed
248
    | Tyapp (ts, tyl) ->
249
       Mltree.Tapp (ts.ts_name, List.map type_ tyl)
Mário Pereira's avatar
Mário Pereira committed
250 251 252 253

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

Mário Pereira's avatar
Mário Pereira committed
254 255 256 257 258
  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
259

260
  let rec filter_out_ghost_rdef = function
Mário Pereira's avatar
Mário Pereira committed
261
    | [] -> []
262 263
    | { rec_sym = rs; rec_rsym = rrs } :: l when rs_ghost rs || rs_ghost rrs ->
      filter_out_ghost_rdef l
Mário Pereira's avatar
Mário Pereira committed
264 265
    | rdef :: l ->
      rdef :: filter_out_ghost_rdef l
Mário Pereira's avatar
Mário Pereira committed
266

Mário Pereira's avatar
Mário Pereira committed
267
  let rec pat m p = match p.pat_node with
268
    | Pwild ->
269
      Mltree.Pwild
270
    | Pvar vs when (restore_pv vs).pv_ghost ->
271
      Mltree.Pwild
272
    | Pvar vs ->
273
      Mltree.Pident vs.vs_name
274
    | Por (p1, p2) ->
Mário Pereira's avatar
Mário Pereira committed
275
      Mltree.Por (pat m p1, pat m p2)
276
    | Pas (p, vs) when (restore_pv vs).pv_ghost ->
Mário Pereira's avatar
Mário Pereira committed
277
      pat m p
278
    | Pas (p, vs) ->
Mário Pereira's avatar
Mário Pereira committed
279
      Mltree.Pas (pat m p, vs.vs_name)
280
    | Papp (ls, pl) when is_fs_tuple ls ->
Mário Pereira's avatar
Mário Pereira committed
281 282 283 284 285
      let pl = visible_of_mask m pl in
      begin match pl with
        | [] -> Mltree.Pwild
        | [p] -> pat m p
        | _ -> Mltree.Ptuple (List.map (pat m) pl) end
286
    | Papp (ls, pl) ->
287 288
      let rs = restore_rs ls in
      let args = rs.rs_cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
289
      let mk acc pv pp = if not pv.pv_ghost then pat m pp :: acc else acc in
290
      let pat_pl = List.fold_left2 mk [] args pl in
291
      Mltree.Papp (ls, List.rev pat_pl)
292

Mário Pereira's avatar
Mário Pereira committed
293 294
  (** programs *)

295 296
  let pv_name pv = pv.pv_vs.vs_name

297
  (* individual types *)
Mário Pereira's avatar
Mário Pereira committed
298 299
  let mlty_of_ity mask t =
    let rec loop t = match t.ity_node with
300
    | _ when mask_equal mask MaskGhost -> ML.tunit
Mário Pereira's avatar
Mário Pereira committed
301 302 303 304 305 306 307 308 309 310
    | Ityvar (tvs, _) ->
      Mltree.Tvar tvs
    | Ityapp ({its_ts = ts}, itl, _) when is_ts_tuple ts ->
      let itl = List.rev (visible_of_mask mask itl) in
      Mltree.Ttuple (List.map loop itl)
    | Ityapp ({its_ts = ts}, itl, _) ->
      Mltree.Tapp (ts.ts_name, List.map loop itl)
    | Ityreg {reg_its = its; reg_args = args} ->
      let args = List.map loop args in
      Mltree.Tapp (its.its_ts.ts_name, args) in
Mário Pereira's avatar
Mário Pereira committed
311
    loop t
Mário Pereira's avatar
Mário Pereira committed
312

Mário Pereira's avatar
Mário Pereira committed
313
  let pvty pv =
Mário Pereira's avatar
Mário Pereira committed
314 315
    if pv.pv_ghost then ML.mk_var (pv_name pv) ML.tunit true
    else let (vs, vs_ty) = vsty pv.pv_vs in
316
      ML.mk_var vs vs_ty false
Mário Pereira's avatar
Mário Pereira committed
317

318 319 320
  (* let for_direction = function *)
  (*   | To -> Mltree.To *)
  (*   | DownTo -> Mltree.DownTo *)
321

Mário Pereira's avatar
Mário Pereira committed
322
  let isconstructor info rs =
323
    match Mid.find_opt rs.rs_name info.Mltree.from_km with
Mário Pereira's avatar
Mário Pereira committed
324 325 326 327 328 329
    | 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
330 331 332 333
  let is_singleton_imutable itd =
    let not_g e = not (rs_ghost e) in
    let pjl = itd.itd_fields in
    let mfields = itd.itd_its.its_mfields in
334
    let pv_equal_field rs = pv_equal (fd_of_rs rs) in
Mário Pereira's avatar
Mário Pereira committed
335 336 337 338
    let get_mutable rs = List.exists (pv_equal_field rs) mfields in
    match filter_ghost_params not_g get_mutable pjl with
    | [is_mutable] -> not is_mutable
    | _ -> false
Mário Pereira's avatar
Mário Pereira committed
339

340
  let get_record_itd info rs =
341
    match Mid.find_opt rs.rs_name info.Mltree.from_km with
Mário Pereira's avatar
Mário Pereira committed
342 343
    | Some {pd_node = PDtype itdl} ->
      let f pjl_constr = List.exists (rs_equal rs) pjl_constr in
344
      let itd = match rs.rs_field with
Mário Pereira's avatar
Mário Pereira committed
345
        | Some _ -> List.find (fun itd -> f itd.itd_fields) itdl
346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361
        | None -> List.find (fun itd -> f itd.itd_constructors) itdl in
      if itd.itd_fields = [] then None else Some itd
    | _ -> None

  let is_optimizable_record_itd itd =
    not itd.itd_its.its_private && is_singleton_imutable itd

  let is_optimizable_record_rs info rs =
    Opt.fold (fun _ -> is_optimizable_record_itd) false (get_record_itd info rs)

  let is_empty_record_itd itd =
    let is_ghost rs = rs_ghost rs in
    List.for_all is_ghost itd.itd_fields

  let is_empty_record info rs =
    Opt.fold (fun _ -> is_empty_record_itd) false (get_record_itd info rs)
Mário Pereira's avatar
Mário Pereira committed
362

Mário Pereira's avatar
Mário Pereira committed
363
  let mk_eta_expansion rsc pvl cty_app =
Mário Pereira's avatar
Mário Pereira committed
364 365
    (* FIXME : effects and types of the expression in this situation *)
    let args_f =
366 367
      let def pv = (pv_name pv, mlty_of_ity (mask_of_pv pv) pv.pv_ity,
                    pv.pv_ghost) in
Mário Pereira's avatar
Mário Pereira committed
368 369
      filter_ghost_params pv_not_ghost def cty_app.cty_args in
    let args =
370 371
      let def pv = ML.mk_expr (Mltree.Evar pv) (Mltree.I pv.pv_ity) eff_empty
          Slab.empty in
Mário Pereira's avatar
Mário Pereira committed
372
      let args = filter_ghost_params pv_not_ghost def pvl in
373
      let extra_args = List.map def cty_app.cty_args in args @ extra_args in
374
    let eapp = ML.mk_expr (Mltree.Eapp (rsc, args)) (Mltree.C cty_app)
Mário Pereira's avatar
Mário Pereira committed
375
        cty_app.cty_effect Slab.empty in
376
    ML.mk_expr (Mltree.Efun (args_f, eapp)) (Mltree.C cty_app)
Mário Pereira's avatar
Mário Pereira committed
377
      cty_app.cty_effect Slab.empty
Mário Pereira's avatar
Mário Pereira committed
378

379 380 381 382 383 384
  (* 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
385 386 387 388
  let params = function
    | []   -> []
    | args -> let args = filter_params args in
      if args = [] then [ML.mk_var_unit ()] else args
389

Mário Pereira's avatar
Mário Pereira committed
390 391
  let filter_params_cty p def pvl cty_args =
    let rec loop = function
Mário Pereira's avatar
Mário Pereira committed
392
      | [], _ -> []
Mário Pereira's avatar
Mário Pereira committed
393 394 395 396 397 398 399
      | 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 =
Mário Pereira's avatar
Mário Pereira committed
400 401
    let def pv =
      ML.mk_expr (Mltree.Evar pv) (Mltree.I pv.pv_ity) eff_empty Slab.empty in
Mário Pereira's avatar
Mário Pereira committed
402 403
    filter_params_cty pv_not_ghost def pvl cty_args

Mário Pereira's avatar
Mário Pereira committed
404
  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
405 406
    let i_expr, from_expr, to_expr =
      let int_ity = ML.ity_int in let eff_e = eff_empty in
Mário Pereira's avatar
Mário Pereira committed
407 408 409
      ML.mk_expr (Mltree.Evar i_pv)    int_ity eff_e Slab.empty,
      ML.mk_expr (Mltree.Evar from_pv) int_ity eff_e Slab.empty,
      ML.mk_expr (Mltree.Evar to_pv)   int_ity eff_e Slab.empty in
Mário Pereira's avatar
Mário Pereira committed
410
    let for_rs    =
Mário Pereira's avatar
Mário Pereira committed
411
      let for_id  = id_fresh "for_loop_to" in
Mário Pereira's avatar
Mário Pereira committed
412
      let for_cty = create_cty [i_pv] [] [] Mxs.empty Mpv.empty eff ity_unit in
Mário Pereira's avatar
Mário Pereira committed
413 414
      create_rsymbol for_id for_cty in
    let for_expr =
Mário Pereira's avatar
Mário Pereira committed
415 416 417
      let test =
        ML.mk_expr (Mltree.Eapp (op_b_rs, [i_expr; to_expr]))
          (Mltree.I ity_bool) eff_empty Slab.empty in
Mário Pereira's avatar
Mário Pereira committed
418
      let next_expr =
419
        let one_const = Number.int_const_of_int 1 in
Mário Pereira's avatar
Mário Pereira committed
420
        let one_expr  =
Mário Pereira's avatar
Mário Pereira committed
421 422
          ML.mk_expr (Mltree.Econst one_const) ML.ity_int
            eff_empty Slab.empty in
423
        let i_op_one = Mltree.Eapp (op_a_rs, [i_expr; one_expr]) in
Mário Pereira's avatar
Mário Pereira committed
424 425 426 427
        ML.mk_expr i_op_one ML.ity_int eff_empty Slab.empty in
      let rec_call  =
        ML.mk_expr (Mltree.Eapp (for_rs, [next_expr])) ML.ity_unit
          eff Slab.empty in
Mário Pereira's avatar
Mário Pereira committed
428
      let seq_expr =
Mário Pereira's avatar
Mário Pereira committed
429 430 431 432
        ML.mk_expr (ML.eseq body_expr rec_call) ML.ity_unit eff Slab.empty in
      ML.mk_expr (Mltree.Eif (test, seq_expr, ML.mk_unit)) ML.ity_unit
        eff Slab.empty in
    let ty_int = mlty_of_ity MaskVisible ity_int in
Mário Pereira's avatar
Mário Pereira committed
433
    let for_call_expr = let for_call = Mltree.Eapp (for_rs, [from_expr]) in
Mário Pereira's avatar
Mário Pereira committed
434
      ML.mk_expr for_call ML.ity_unit eff Slab.empty in
Mário Pereira's avatar
Mário Pereira committed
435
    let pv_name pv = pv.pv_vs.vs_name in
436
    let args = [ pv_name i_pv, ty_int, false ] in
Mário Pereira's avatar
Mário Pereira committed
437
    let for_rec_def = {
438 439 440
      Mltree.rec_sym  = for_rs;   Mltree.rec_args = args;
      Mltree.rec_rsym = for_rs;   Mltree.rec_exp  = for_expr;
      Mltree.rec_res  = ML.tunit; Mltree.rec_svar = Stv.empty;
Mário Pereira's avatar
Mário Pereira committed
441
    } in
442
    let for_let = Mltree.Elet (Mltree.Lrec [for_rec_def], for_call_expr) in
Mário Pereira's avatar
Mário Pereira committed
443 444 445 446
    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 =
447
      let ns = (Opt.get info.Mltree.from_mod).mod_export in
Mário Pereira's avatar
Mário Pereira committed
448 449 450 451 452
      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 =
453
      let ns = (Opt.get info.Mltree.from_mod).mod_export in
Mário Pereira's avatar
Mário Pereira committed
454 455 456
      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

457
  (* exception ExtractionAny *)
Mário Pereira's avatar
Mário Pereira committed
458

459 460
  (* build the set of type variables from functions arguments *)
  let rec add_tvar acc = function
461 462
    | Mltree.Tvar tv -> Stv.add tv acc
    | Mltree.Tapp (_, tyl) | Mltree.Ttuple tyl ->
463 464
      List.fold_left add_tvar acc tyl

Mário Pereira's avatar
Mário Pereira committed
465
  (* expressions *)
Mário Pereira's avatar
Mário Pereira committed
466
  let rec expr info ({e_effect = eff; e_label = lbl} as e) =
Mário Pereira's avatar
Mário Pereira committed
467
    assert (not eff.eff_ghost);
Mário Pereira's avatar
Mário Pereira committed
468
    match e.e_node with
469
    | Econst c ->
Mário Pereira's avatar
Mário Pereira committed
470 471
      let c = match c with Number.ConstInt c -> c | _ -> assert false in
      ML.mk_expr (Mltree.Econst c) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
472
    | Evar pv ->
Mário Pereira's avatar
Mário Pereira committed
473
      ML.mk_expr (Mltree.Evar pv) (Mltree.I e.e_ity) eff lbl
474
    | Elet (LDvar (_, e1), e2) when e_ghost e1 ->
Mário Pereira's avatar
Mário Pereira committed
475
      expr info e2
476
    | Elet (LDvar (_, e1), e2) when e_ghost e2 ->
477 478 479 480
      (* sequences are transformed into [let o = e1 in e2] by A-normal form *)
      (* FIXME? this is only the case when e1 is effectful ? *)
      let e1 = expr info e1 in
      ML.mk_expr e1.Mltree.e_node ML.ity_unit eff lbl
Mário Pereira's avatar
Mário Pereira committed
481 482 483
    | Elet (LDvar (pv, e1), e2)
      when pv.pv_ghost || not (Mpv.mem pv e2.e_effect.eff_reads) ->
      if eff_pure e1.e_effect then expr info e2
484 485
      else let e1 = ML.mk_ignore (expr info e1) and e2 = expr info e2 in
        ML.mk_expr (ML.eseq e1 e2) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
486 487
    | Elet (LDvar (pv, e1), e2) ->
      let ml_let = ML.mk_let_var pv (expr info e1) (expr info e2) in
Mário Pereira's avatar
Mário Pereira committed
488
      ML.mk_expr ml_let (Mltree.I e.e_ity) eff lbl
489 490
    | Elet (LDsym (rs, _), ein) when rs_ghost rs ->
      expr info ein
491
    | Elet (LDsym (rs, {c_node = Cfun ef; c_cty = cty}), ein) ->
492
      let args = params cty.cty_args in
493 494
      let ef = expr info ef in
      let ein = expr info ein in
Mário Pereira's avatar
Mário Pereira committed
495
      let res = mlty_of_ity cty.cty_mask cty.cty_result in
496 497
      let ml_letf = Mltree.Elet (Mltree.Lsym (rs, res, args, ef), ein) in
      ML.mk_expr ml_letf (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
498
    | Elet (LDsym (rsf, {c_node = Capp (rs_app, pvl); c_cty = cty}), ein)
499
      when isconstructor info rs_app -> (* partial application of constructor *)
Mário Pereira's avatar
Mário Pereira committed
500
      let eta_app = mk_eta_expansion rs_app pvl cty in
Mário Pereira's avatar
Mário Pereira committed
501
      let ein = expr info ein in
Mário Pereira's avatar
Mário Pereira committed
502 503
      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
Mário Pereira's avatar
Mário Pereira committed
504
      let res = mlty_of_ity cty.cty_mask func in
505 506
      let ml_letf = Mltree.Elet (Mltree.Lsym (rsf, res, [], eta_app), ein) in
      ML.mk_expr ml_letf (Mltree.I e.e_ity) e.e_effect lbl
Mário Pereira's avatar
Mário Pereira committed
507
    | Elet (LDsym (rsf, {c_node = Capp (rs_app, pvl); c_cty = cty}), ein) ->
508
      (* partial application *)
Mário Pereira's avatar
Mário Pereira committed
509
      let pvl = app pvl rs_app.rs_cty.cty_args in
510
      let eapp = ML.mk_expr (Mltree.Eapp (rs_app, pvl)) (Mltree.C cty)
Mário Pereira's avatar
Mário Pereira committed
511
          cty.cty_effect Slab.empty in
Mário Pereira's avatar
Mário Pereira committed
512
      let ein  = expr info ein in
Mário Pereira's avatar
Mário Pereira committed
513
      let res  = mlty_of_ity cty.cty_mask cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
514
      let args = params cty.cty_args in
515
      let ml_letrec = Mltree.Elet (Mltree.Lsym (rsf, res, args, eapp), ein) in
Mário Pereira's avatar
Mário Pereira committed
516
      ML.mk_expr ml_letrec (Mltree.I e.e_ity) e.e_effect lbl
Mário Pereira's avatar
Mário Pereira committed
517
    | Elet (LDrec rdefl, ein) ->
518 519 520 521
      let rdefl = filter_out_ghost_rdef rdefl in
      let def = function
        | {rec_sym = rs1; rec_rsym = rs2;
           rec_fun = {c_node = Cfun ef; c_cty = cty}} ->
Mário Pereira's avatar
Mário Pereira committed
522
          let res  = mlty_of_ity rs1.rs_cty.cty_mask rs1.rs_cty.cty_result in
523 524 525
          let args = params cty.cty_args in
          let svar =
            let args' = List.map (fun (_, ty, _) -> ty) args in
526
            let svar  = List.fold_left add_tvar Stv.empty args' in
527 528
            add_tvar svar res in
          let ef = expr info ef in
529 530 531
          { Mltree.rec_sym  = rs1;  Mltree.rec_rsym = rs2;
            Mltree.rec_args = args; Mltree.rec_exp  = ef ;
            Mltree.rec_res  = res;  Mltree.rec_svar = svar; }
532 533
        | _ -> assert false in
      let rdefl = List.map def rdefl in
534
      if rdefl <> [] then
535
        let ml_letrec = Mltree.Elet (Mltree.Lrec rdefl, expr info ein) in
Mário Pereira's avatar
Mário Pereira committed
536
        ML.mk_expr ml_letrec (Mltree.I e.e_ity) e.e_effect lbl
537
      else expr info ein
538 539
    | Eexec ({c_node = Capp (rs, [])}, _) when is_rs_tuple rs ->
      ML.mk_unit
540 541
    | Eexec ({c_node = Capp (rs, _)}, _) when is_empty_record info rs ->
      ML.mk_unit
542 543
    | Eexec ({c_node = Capp (rs, _)}, _) when rs_ghost rs ->
      ML.mk_unit
Mário Pereira's avatar
Mário Pereira committed
544
    | Eexec ({c_node = Capp (rs, pvl); c_cty = cty}, _)
Mário Pereira's avatar
Mário Pereira committed
545 546
      when isconstructor info rs && cty.cty_args <> [] ->
      (* partial application of constructors *)
Mário Pereira's avatar
Mário Pereira committed
547
      mk_eta_expansion rs pvl cty
Mário Pereira's avatar
Mário Pereira committed
548
    | Eexec ({c_node = Capp (rs, pvl); _}, _) ->
Mário Pereira's avatar
Mário Pereira committed
549
      let pvl = app pvl rs.rs_cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
550
      begin match pvl with
551
      | [pv_expr] when is_optimizable_record_rs info rs -> pv_expr
Mário Pereira's avatar
Mário Pereira committed
552
      | _ -> ML.mk_expr (Mltree.Eapp (rs, pvl)) (Mltree.I e.e_ity) eff lbl end
Mário Pereira's avatar
Mário Pereira committed
553 554 555
    | Eexec ({c_node = Cfun e; c_cty = {cty_args = []}}, _) ->
      (* abstract block *)
      expr info e
556
    | Eexec ({c_node = Cfun e; c_cty = cty}, _) ->
557
      let args = params cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
558
      ML.mk_expr (Mltree.Efun (args, expr info e)) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
559
    | Eexec ({c_node = Cany}, _) -> (* raise ExtractionAny *)
Mário Pereira's avatar
Mário Pereira committed
560
      ML.mk_hole
561
    | Eabsurd ->
Mário Pereira's avatar
Mário Pereira committed
562
      ML.mk_expr Mltree.Eabsurd (Mltree.I e.e_ity) eff lbl
563 564 565 566 567 568 569
    | Ecase (e1, bl) when e_ghost e1 ->
      (* if [e1] is ghost but the entire [match-with] expression doesn't,
         it must be the case the first branch is irrefutable *)
      begin match bl with
      | [] -> assert false
      | (_, e) :: _ -> expr info e
      end
570
    | Ecase (e1, pl) ->
571
      let e1 = expr info e1 and pl = List.map (ebranch info) pl in
Mário Pereira's avatar
Mário Pereira committed
572
      ML.mk_expr (Mltree.Ematch (e1, pl)) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
573
    | Eassert _ -> ML.mk_unit
574 575 576 577
    | Eif (e1, e2, e3) when e_ghost e1 ->
      (* if [e1] is ghost but the entire [if-then-else] expression doesn't,
         it must be the case one of the branches is [Eabsurd] *)
      if e2.e_node = Eabsurd then expr info e3 else expr info e2
Mário Pereira's avatar
Mário Pereira committed
578
    | Eif (e1, e2, e3) when e_ghost e3 ->
579
      let e1 = expr info e1 and e2 = expr info e2 in
Mário Pereira's avatar
Mário Pereira committed
580
      ML.mk_expr (Mltree.Eif (e1, e2, ML.mk_unit)) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
581
    | Eif (e1, e2, e3) when e_ghost e2 ->
582
      let e1 = expr info e1 and e3 = expr info e3 in
Mário Pereira's avatar
Mário Pereira committed
583
      ML.mk_expr (Mltree.Eif (e1, ML.mk_unit, e3)) (Mltree.I e.e_ity) eff lbl
584
    | Eif (e1, e2, e3) ->
585 586 587
      let e1 = expr info e1 and e2 = expr info e2 and e3 = expr info e3 in
      (* ML.e_if (expr info e1) (expr info e2) (expr info e3) e.e_ity eff
  lbl --> TODO *)
Mário Pereira's avatar
Mário Pereira committed
588
      ML.mk_expr (Mltree.Eif (e1, e2, e3)) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
589
    | Ewhile (e1, _, _, e2) ->
590
      let e1 = expr info e1 and e2 = expr info e2 in
Mário Pereira's avatar
Mário Pereira committed
591
      ML.mk_expr (Mltree.Ewhile (e1, e2)) (Mltree.I e.e_ity) eff lbl
592
    | Efor (pv1, (pv2, To, pv3), _, _, efor) ->
Mário Pereira's avatar
Mário Pereira committed
593
      let efor = expr info efor in
Mário Pereira's avatar
Mário Pereira committed
594
      mk_for_to info pv1 pv2 pv3 efor eff lbl
595
    | Efor (pv1, (pv2, DownTo, pv3), _, _, efor) ->
Mário Pereira's avatar
Mário Pereira committed
596
      let efor = expr info efor in
Mário Pereira's avatar
Mário Pereira committed
597
      mk_for_downto info pv1 pv2 pv3 efor eff lbl
Mário Pereira's avatar
Mário Pereira committed
598
    | Eghost _ -> assert false
599
    | Eassign al ->
Mário Pereira's avatar
Mário Pereira committed
600
      ML.mk_expr (Mltree.Eassign al) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
601
    | Epure _ -> (* assert false (\*TODO*\) *) ML.mk_hole
602 603
    | Etry (etry, case, pvl_e_map) ->
      assert (not case); (* TODO *)
Mário Pereira's avatar
Mário Pereira committed
604 605 606 607
      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
Mário Pereira's avatar
Mário Pereira committed
608
      ML.mk_expr (Mltree.Etry (etry, bl)) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
609 610 611
    | Eraise (xs, ex) ->
      let ex =
        match expr info ex with
612
        | {Mltree.e_node = Mltree.Eblock []} -> None
Mário Pereira's avatar
Mário Pereira committed
613 614
        | e -> Some e
      in
Mário Pereira's avatar
Mário Pereira committed
615
      ML.mk_expr (Mltree.Eraise (xs, ex)) (Mltree.I e.e_ity) eff lbl
616 617 618
    | Eexn (xs, e1) ->
      let e1 = expr info e1 in
      let ty = if ity_equal xs.xs_ity ity_unit
Mário Pereira's avatar
Mário Pereira committed
619 620
        then None else Some (mlty_of_ity xs.xs_mask xs.xs_ity) in
      ML.mk_expr (Mltree.Eexn (xs, ty, e1)) (Mltree.I e.e_ity) eff lbl
Mário Pereira's avatar
Mário Pereira committed
621 622 623 624
    | Elet (LDsym (_, {c_node=(Cany|Cpur (_, _)); _ }), _)
    (*   assert false (\*TODO*\) *)
    | Eexec ({c_node=Cpur (_, _); _ }, _) -> ML.mk_hole
    (*   assert false (\*TODO*\) *)
625

Mário Pereira's avatar
Mário Pereira committed
626
  and ebranch info ({pp_pat = p; pp_mask = m}, e) =
Mário Pereira's avatar
Mário Pereira committed
627 628 629
    (* if the [case] expression is not ghost but there is (at least) one ghost
       branch, then it must be the case that all the branches return [unit]
       and at least one of the non-ghost branches is effectful *)
630
    if e.e_effect.eff_ghost then (pat m p, ML.mk_unit)
Mário Pereira's avatar
Mário Pereira committed
631
    else (pat m p, expr info e)
632

633
  (* type declarations/definitions *)
Mário Pereira's avatar
Mário Pereira committed
634
  let tdef itd =
635
    let s = itd.itd_its in
636
    let ddata_constructs = (* point-free *)
Mário Pereira's avatar
Mário Pereira committed
637
      List.map (fun ({rs_cty = cty} as rs) ->
638
          rs.rs_name,
Mário Pereira's avatar
Mário Pereira committed
639
          let args = List.filter pv_not_ghost cty.cty_args in
640 641
          List.map (fun {pv_vs = vs} -> type_ vs.vs_ty) args)
    in
Mário Pereira's avatar
Mário Pereira committed
642
    let drecord_fields ({rs_cty = cty} as rs) =
643
      (List.exists (pv_equal (fd_of_rs rs)) s.its_mfields),
Mário Pereira's avatar
Mário Pereira committed
644
      rs.rs_name,
Mário Pereira's avatar
Mário Pereira committed
645
      mlty_of_ity cty.cty_mask cty.cty_result
646 647 648 649
    in
    let id = s.its_ts.ts_name in
    let is_private = s.its_private in
    let args = s.its_ts.ts_args in
650
    begin match s.its_def, itd.itd_constructors, itd.itd_fields with
651
      | NoDef, [], [] ->
Mário Pereira's avatar
Mário Pereira committed
652
        ML.mk_its_defn id args is_private None
653
      | NoDef, cl, [] ->
Mário Pereira's avatar
Mário Pereira committed
654
        let cl = ddata_constructs cl in
655
        ML.mk_its_defn id args is_private (Some (Mltree.Ddata cl))
656
      | NoDef, _, pjl ->
Mário Pereira's avatar
Mário Pereira committed
657 658
        let p e = not (rs_ghost e) in
        let pjl = filter_ghost_params p drecord_fields pjl in
Mário Pereira's avatar
Mário Pereira committed
659
        begin match pjl with
660 661
          | [] -> ML.mk_its_defn id args is_private
                    (Some (Mltree.Dalias ML.tunit))
662
          | [_, _, ty_pj] when is_optimizable_record_itd itd ->
663 664
            ML.mk_its_defn id args is_private (Some (Mltree.Dalias ty_pj))
          | pjl -> ML.mk_its_defn id args is_private (Some (Mltree.Drecord pjl))
Mário Pereira's avatar
Mário Pereira committed
665
        end
666
      | Alias t, _, _ ->
Mário Pereira's avatar
Mário Pereira committed
667 668
        ML.mk_its_defn id args is_private (* FIXME ? is this a good mask ? *)
          (Some (Mltree.Dalias (mlty_of_ity MaskVisible t)))
669 670
      | Range _, _, _ -> assert false (* TODO *)
      | Float _, _, _ -> assert false (* TODO *)
671
    end
Mário Pereira's avatar
Mário Pereira committed
672

673
  (* exception ExtractionVal of rsymbol *)
Mário Pereira's avatar
Mário Pereira committed
674

Mário Pereira's avatar
Mário Pereira committed
675 676 677 678
  let is_val = function
    | Eexec ({c_node = Cany}, _) -> true
    | _ -> false

Mário Pereira's avatar
Mário Pereira committed
679 680 681
  let rec fun_expr_of_mask mask e =
    let open Mltree in
    let mk_e e_node = { e with e_node = e_node } in
682
    (* assert (mask <> MaskGhost); *)
Mário Pereira's avatar
Mário Pereira committed
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
    match e.e_node with
    | Econst _ | Evar _   | Efun _ | Eassign _ | Ewhile _
    | Efor   _ | Eraise _ | Eexn _ | Eabsurd   | Ehole    -> e
    | Eapp (rs, el) when is_rs_tuple rs ->
      begin match visible_of_mask mask el with
        | [] -> ML.mk_unit
        | [e] -> e
        | el -> mk_e (Eapp (rs, el)) end
    | Eapp _ -> e
    | Elet (let_def, ein) -> let ein = fun_expr_of_mask mask ein in
      mk_e (Elet (let_def, ein))
    | Eif (e1, e2, e3) ->
      let e2 = fun_expr_of_mask mask e2 in
      let e3 = fun_expr_of_mask mask e3 in
      mk_e (Eif (e1, e2, e3))
    | Ematch (e1, pel) ->
      let mk_pel (p, ee) = (p, fun_expr_of_mask mask ee) in
      mk_e (Ematch (e1, List.map mk_pel pel))
    | Eblock [] -> e
    | Eblock el -> let (e_block, e_last) = Lists.chop_last el in
      let e_last = fun_expr_of_mask mask e_last in
      mk_e (Eblock (e_block @ [e_last]))
    | Etry (e1, xspvel) ->
      let mk_xspvel (xs, pvl, ee) = (xs, pvl, fun_expr_of_mask mask ee) in
      mk_e (Etry (e1, List.map mk_xspvel xspvel))
    | Eignore ee ->
      let ee = fun_expr_of_mask mask ee in
      mk_e (Eignore ee)

712 713
  (* pids: identifiers from cloned modules without definitions *)
  let pdecl _pids info pd =
Mário Pereira's avatar
Mário Pereira committed
714
    match pd.pd_node with
715
    | PDlet (LDsym (rs, _)) when rs_ghost rs ->
Mário Pereira's avatar
Mário Pereira committed
716
      []
Mário Pereira's avatar
Mário Pereira committed
717 718 719 720
    | PDlet (LDsym ({rs_cty = cty} as rs, {c_node = Cany})) ->
      let args = params cty.cty_args in
      let res = mlty_of_ity cty.cty_mask cty.cty_result in
      [Mltree.Dlet (Mltree.Lany (rs, res, args))]
Mário Pereira's avatar
Mário Pereira committed
721
      (* raise (ExtractionVal _rs) *)
Mário Pereira's avatar
Mário Pereira committed
722 723
    | PDlet (LDsym (_, {c_node = Cfun e})) when is_val e.e_node ->
      []
Mário Pereira's avatar
Mário Pereira committed
724
    | PDlet (LDsym ({rs_cty = cty} as rs, {c_node = Cfun e})) ->
725
      let args = params cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
726 727 728 729
      let res = mlty_of_ity cty.cty_mask cty.cty_result in
      let e = expr info e in
      let e = fun_expr_of_mask cty.cty_mask e in
      [Mltree.Dlet (Mltree.Lsym (rs, res, args, e))]
730
    | PDlet (LDrec rl) ->
731
      let rl = filter_out_ghost_rdef rl in
Mário Pereira's avatar
Mário Pereira committed
732
      let def {rec_fun = e; rec_sym = rs1; rec_rsym = rs2} =
Mário Pereira's avatar
Mário Pereira committed
733
        let e = match e.c_node with Cfun e -> e | _ -> assert false in
Mário Pereira's avatar
Mário Pereira committed
734
        let args = params rs1.rs_cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
735
        let res  = mlty_of_ity rs1.rs_cty.cty_mask rs1.rs_cty.cty_result in
736 737
        let svar =
          let args' = List.map (fun (_, ty, _) -> ty) args in
738
          let svar  = List.fold_left add_tvar Stv.empty args' in
739
          add_tvar svar res in
Mário Pereira's avatar
Mário Pereira committed
740
        let e = fun_expr_of_mask rs1.rs_cty.cty_mask (expr info e) in
741
        { Mltree.rec_sym  = rs1;  Mltree.rec_rsym = rs2;
Mário Pereira's avatar
Mário Pereira committed
742
          Mltree.rec_args = args; Mltree.rec_exp  = e;
743 744
          Mltree.rec_res  = res;  Mltree.rec_svar = svar; } in
      if rl = [] then [] else [Mltree.Dlet (Mltree.Lrec (List.map def rl))]
Mário Pereira's avatar
Mário Pereira committed
745
    | PDlet (LDsym _) | PDpure | PDlet (LDvar _) ->
746
      []
747
    | PDtype itl ->
Mário Pereira's avatar
Mário Pereira committed
748
      let itsd = List.map tdef itl in
749
      [Mltree.Dtype itsd]
750
    | PDexn xs ->
751
      if ity_equal xs.xs_ity ity_unit then [Mltree.Dexn (xs, None)]
Mário Pereira's avatar
Mário Pereira committed
752
      else [Mltree.Dexn (xs, Some (mlty_of_ity xs.xs_mask xs.xs_ity))]
Mário Pereira's avatar
Mário Pereira committed
753

Mário Pereira's avatar
Mário Pereira committed
754
  let pdecl_m m pd =
755
    let info = { Mltree.from_mod = Some m; Mltree.from_km = m.mod_known; } in
756
    pdecl Sid.empty info pd
Mário Pereira's avatar
Mário Pereira committed
757

758 759 760 761 762 763 764 765 766 767 768
  let abstract_or_alias_type itd =
    itd.itd_fields = [] && itd.itd_constructors = []

  let empty_pdecl pd  = match pd.pd_node with
    | PDlet (LDsym (_, {c_node = Cfun _})) | PDlet (LDrec _) -> false
    | PDexn _ -> false (* FIXME? *)
    | PDtype itl -> List.for_all abstract_or_alias_type itl
    | _ -> true
  let rec empty_munit = function
    | Udecl pd -> empty_pdecl pd
    | Uclone mi -> List.for_all empty_munit mi.mi_mod.mod_units
769
    | Uscope (_, l) -> List.for_all empty_munit l
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788
    | Uuse _ | Umeta _ -> true

  let is_empty_clone mi =
    Mts.is_empty mi.mi_ty &&
    Mts.is_empty mi.mi_ts &&
    Mls.is_empty mi.mi_ls &&
    Decl.Mpr.is_empty mi.mi_pr &&
    Decl.Mpr.is_empty mi.mi_pk &&
    Mvs.is_empty mi.mi_pv &&
    Mrs.is_empty mi.mi_rs &&
    Mxs.is_empty mi.mi_xs &&
    List.for_all empty_munit mi.mi_mod.mod_units

  let find_params dl =
    let add params = function
      | Uclone mi when is_empty_clone mi -> mi :: params
      | _ -> params in
    List.fold_left add [] dl

Mário Pereira's avatar
Mário Pereira committed
789 790 791 792
  (* unit module declarations *)
  let rec mdecl pids info = function
    | Udecl pd ->