compile.ml 30.3 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
(********************************************************************)
(*                                                                  *)
(*  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.                           *)
(*                                                                  *)
(********************************************************************)

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

  - 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 = ...")
*)

(** Abstract syntax of ML *)

open Ident
open Ity
Mário Pereira's avatar
Mário Pereira committed
30
open Ty
Mário Pereira's avatar
Mário Pereira committed
31
open Term
32

Mário Pereira's avatar
Mário Pereira committed
33 34 35 36 37 38 39 40
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
41
  let fname = match fname, path with
Mário Pereira's avatar
Mário Pereira committed
42 43 44 45 46
    | None, "why3"::_ -> "why3"
    | None, _   -> String.concat "__" path
    | Some f, _ -> clean_name f in
  fname ^ "__" ^ t

47 48
module ML = struct

49 50
  open Expr

51
  type ty =
52
    | Tvar    of tvsymbol
53 54 55
    | Tapp    of ident * ty list
    | Ttuple  of ty list

56 57 58
  type is_ghost = bool

  type var = ident * ty * is_ghost
59

Mário Pereira's avatar
Mário Pereira committed
60 61
  type for_direction = To | DownTo

62 63 64
  type pat =
    | Pwild
    | Pident  of ident
Mário Pereira's avatar
Mário Pereira committed
65
    | Papp    of lsymbol * pat list
66 67 68 69 70 71 72 73
    | Ptuple  of pat list
    | Por     of pat * pat
    | Pas     of pat * ident

  type is_rec = bool

  type binop = Band | Bor | Beq

74
  type ity = I of Ity.ity | C of Ity.cty (* TODO: keep it like this? *)
75

76
  type expr = {
Mário Pereira's avatar
Mário Pereira committed
77 78 79
    e_node   : expr_node;
    e_ity    : ity;
    e_effect : effect;
80
    (* TODO: add the set of free variables? *)
81 82 83 84
  }

  and expr_node =
    | Econst  of Number.integer_constant
85
    | Evar    of pvsymbol
86
    | Eapp    of rsymbol * expr list
87
    | Efun    of var list * expr
Mário Pereira's avatar
Mário Pereira committed
88
    | Elet    of let_def * expr
89
    | Eif     of expr * expr * expr
Mário Pereira's avatar
Mário Pereira committed
90
    (* | Ecast   of expr * ty *)
Mário Pereira's avatar
Mário Pereira committed
91
    | Eassign of (pvsymbol * rsymbol * pvsymbol) list
92 93 94
    | Ematch  of expr * (pat * expr) list
    | Eblock  of expr list
    | Ewhile  of expr * expr
Mário Pereira's avatar
Mário Pereira committed
95 96
    (* For loop for Why3's type int *)
    | Efor    of pvsymbol * pvsymbol * for_direction * pvsymbol * expr
Mário Pereira's avatar
Mário Pereira committed
97 98
    | Eraise  of xsymbol * expr option
    | Etry    of expr * (xsymbol * pvsymbol list * expr) list
99
    | Eabsurd
Mário Pereira's avatar
Mário Pereira committed
100
    | Ehole
101
    (* | Eany *)
102

Mário Pereira's avatar
Mário Pereira committed
103 104
  and let_def =
    | Lvar of pvsymbol * expr
Mário Pereira's avatar
Mário Pereira committed
105
    | Lsym of rsymbol * ty * var list * expr
Mário Pereira's avatar
Mário Pereira committed
106 107 108 109 110 111 112
    | 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
113
    rec_res  : ty;
Mário Pereira's avatar
Mário Pereira committed
114 115
  }

116 117 118 119 120 121 122
  type is_mutable = bool

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

123 124 125 126 127 128 129
  type its_defn = {
    its_name    : ident;
    its_args    : tvsymbol list;
    its_private : bool;
    its_def     : typedef option;
  }

130
  type decl =
Mario Pereira's avatar
Mario Pereira committed
131
    | Dtype   of its_defn list
Mário Pereira's avatar
Mário Pereira committed
132
    | Dlet    of let_def
Mario Pereira's avatar
Mario Pereira committed
133
    | Dexn    of xsymbol * ty option
134 135 136 137
    | Dclone  of ident * decl list
(*
    | Dfunctor of ident * (ident * decl list) list * decl list
*)
Mario Pereira's avatar
Mario Pereira committed
138

Mário Pereira's avatar
Mário Pereira committed
139 140
  type known_map = decl Mid.t

141 142 143 144 145
  type from_module = {
    from_mod: Pmodule.pmodule option;
    from_km : Pdecl.known_map;
  }

Mário Pereira's avatar
Mário Pereira committed
146
  type pmodule = {
147
    mod_from  : from_module;
Mário Pereira's avatar
Mário Pereira committed
148 149 150 151
    mod_decl  : decl list;
    mod_known : known_map;
  }

Mário Pereira's avatar
Mário Pereira committed
152 153 154
  let get_decl_name = function
    | Dtype itdefl -> List.map (fun {its_name = id} -> id) itdefl
    | Dlet (Lrec rdef) -> List.map (fun {rec_sym = rs} -> rs.rs_name) rdef
155 156 157
    | Dlet (Lvar ({pv_vs={vs_name=id}}, _))
    | Dlet (Lsym ({rs_name=id}, _, _, _))
    | Dexn ({xs_name=id}, _) -> [id]
158
    | Dclone _ -> [] (* FIXME? *)
Mário Pereira's avatar
Mário Pereira committed
159 160

  let add_known_decl decl k_map id =
Mário Pereira's avatar
Mário Pereira committed
161 162
    Mid.add id decl k_map

Mário Pereira's avatar
Mário Pereira committed
163 164
  let rec iter_deps_ty f = function
    | Tvar _ -> ()
Mário Pereira's avatar
Mário Pereira committed
165
    | Tapp (id, ty_l) -> f id; List.iter (iter_deps_ty f) ty_l
Mário Pereira's avatar
Mário Pereira committed
166 167 168
    | Ttuple ty_l -> List.iter (iter_deps_ty f) ty_l

  let iter_deps_typedef f = function
Mário Pereira's avatar
Mário Pereira committed
169 170
    | Ddata constrl ->
      List.iter (fun (_, tyl) -> List.iter (iter_deps_ty f) tyl) constrl
Mário Pereira's avatar
Mário Pereira committed
171
    | Drecord pjl -> List.iter (fun (_, _, ty) -> iter_deps_ty f ty) pjl
Mário Pereira's avatar
Mário Pereira committed
172 173 174 175 176
    | 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
177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198
  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
199
    | Econst _ | Evar _ | Eabsurd | Ehole -> ()
Mário Pereira's avatar
Mário Pereira committed
200 201
    | Eapp (rs, exprl) ->
      f rs.rs_name; List.iter (iter_deps_expr f) exprl
Mário Pereira's avatar
Mário Pereira committed
202 203 204
    | 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
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
    | 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

244
  let rec iter_deps f = function
Mário Pereira's avatar
Mário Pereira committed
245 246
    | Dtype its_dl ->
      List.iter (iter_deps_its_defn f) its_dl
Mário Pereira's avatar
Mário Pereira committed
247 248 249 250 251 252 253 254 255
    | 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
256 257 258
    | Dlet (Lvar (_, e)) -> iter_deps_expr f e
    | Dexn (_, None) -> ()
    | Dexn (_, Some ty) -> iter_deps_ty f ty
259
    | Dclone (_, dl) -> List.iter (iter_deps f) dl
260

261
  let mk_expr e_node e_ity e_effect =
Mário Pereira's avatar
Mário Pereira committed
262 263
    { e_node = e_node; e_ity = e_ity; e_effect = e_effect }

264
  (* smart constructors *)
Mário Pereira's avatar
Mário Pereira committed
265
  let mk_let_var pv e1 e2 =
Mário Pereira's avatar
Mário Pereira committed
266
    Elet (Lvar (pv, e1), e2)
Mário Pereira's avatar
Mário Pereira committed
267 268

  let tunit = Ttuple []
269

Mário Pereira's avatar
Mário Pereira committed
270 271
  let ity_int  = I ity_int
  let ity_unit = I ity_unit
Mário Pereira's avatar
Mário Pereira committed
272

273 274 275 276 277
  let enope = Eblock []

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

Mário Pereira's avatar
Mário Pereira committed
278 279 280
  let mk_hole =
    mk_expr Ehole (I Ity.ity_unit) Ity.eff_empty

281 282
  let mk_var id ty ghost = (id, ty, ghost)

283 284
  let mk_var_unit () = id_register (id_fresh "_"), tunit, true

285
  let mk_its_defn id args private_ def =
Mário Pereira's avatar
Mário Pereira committed
286 287
    { its_name    = id      ; its_args = args;
      its_private = private_; its_def  = def; }
288

289 290
  let eseq e1 e2 =
    match e1.e_node, e2.e_node with
Mário Pereira's avatar
Mário Pereira committed
291
    | (Eblock [] | Ehole), e | e, (Eblock [] | Ehole) -> e
292 293 294 295 296
    | Eblock e1, Eblock e2 -> Eblock (e1 @ e2)
    | _, Eblock e2 -> Eblock (e1 :: e2)
    | Eblock e1, _ -> Eblock (e1 @ [e2])
    | _ -> Eblock [e1; e2]

297
end
Mário Pereira's avatar
Mário Pereira committed
298 299 300 301 302

(** Translation from Mlw to ML *)

module Translate = struct

Mário Pereira's avatar
Mário Pereira committed
303 304 305
  open Expr
  open Pmodule
  open Pdecl
Mário Pereira's avatar
Mário Pereira committed
306

Mário Pereira's avatar
Mário Pereira committed
307 308 309
  (* useful predicates and transformations *)
  let pv_not_ghost e = not e.pv_ghost

Mário Pereira's avatar
Mário Pereira committed
310 311 312 313
  (* types *)
  let rec type_ ty =
    match ty.ty_node with
    | Tyvar tvs ->
314
       ML.Tvar tvs
Mário Pereira's avatar
Mário Pereira committed
315 316 317 318 319 320 321 322
    | 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

323 324 325
  let type_args = (* point-free *)
    List.map (fun x -> x.tv_name)

Mário Pereira's avatar
Mário Pereira committed
326 327 328 329 330
  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
331 332 333 334 335 336 337 338 339 340 341 342

  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
343 344 345 346 347 348
  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

349 350 351
  let rec pat p =
    match p.pat_node with
    | Pwild ->
352
      ML.Pwild
353 354
    | Pvar vs when (restore_pv vs).pv_ghost ->
      ML.Pwild
355
    | Pvar vs ->
356
      ML.Pident vs.vs_name
357
    | Por (p1, p2) ->
358
      ML.Por (pat p1, pat p2)
359 360
    | Pas (p, vs) when (restore_pv vs).pv_ghost ->
      pat p
361
    | Pas (p, vs) ->
362
      ML.Pas (pat p, vs.vs_name)
363
    | Papp (ls, pl) when is_fs_tuple ls ->
364
      ML.Ptuple (List.map pat pl)
365
    | Papp (ls, pl) ->
366 367
      let rs = restore_rs ls in
      let args = rs.rs_cty.cty_args in
368 369
      let mk acc pv pp = if not pv.pv_ghost then pat pp :: acc else acc in
      let pat_pl = List.fold_left2 mk [] args pl in
Mário Pereira's avatar
Mário Pereira committed
370
      ML.Papp (ls, List.rev pat_pl)
371

Mário Pereira's avatar
Mário Pereira committed
372 373
  (** programs *)

374 375
  let pv_name pv = pv.pv_vs.vs_name

376 377 378
  (* individual types *)
  let rec ity t =
    match t.ity_node with
379
    | Ityvar (tvs, _) ->
380
      ML.Tvar tvs
381
    | Ityapp ({its_ts = ts}, itl, _) when is_ts_tuple ts ->
382
      ML.Ttuple (List.map ity itl)
383
    | Ityapp ({its_ts = ts}, itl, _) ->
384 385 386 387
      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
388

Mário Pereira's avatar
Mário Pereira committed
389
  let pvty pv =
390 391 392 393 394
    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
395

396 397 398 399
  let for_direction = function
    | To -> ML.To
    | DownTo -> ML.DownTo

Mário Pereira's avatar
Mário Pereira committed
400
  let isconstructor info rs =
401
    match Mid.find_opt rs.rs_name info.ML.from_km with
Mário Pereira's avatar
Mário Pereira committed
402 403 404 405 406 407
    | 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
408 409 410 411 412 413 414 415 416
  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
    let pv_equal_field rs = pv_equal (Opt.get rs.rs_field) in
    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
417

418
  let get_record_itd info rs =
419
    match Mid.find_opt rs.rs_name info.ML.from_km with
Mário Pereira's avatar
Mário Pereira committed
420 421
    | Some {pd_node = PDtype itdl} ->
      let f pjl_constr = List.exists (rs_equal rs) pjl_constr in
422
      let itd = match rs.rs_field with
Mário Pereira's avatar
Mário Pereira committed
423
        | Some _ -> List.find (fun itd -> f itd.itd_fields) itdl
424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
        | 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
440

Mário Pereira's avatar
Mário Pereira committed
441
  let mk_eta_expansion rsc pvl cty_app =
Mário Pereira's avatar
Mário Pereira committed
442 443 444 445 446
    (* 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 =
447
      let def pv = ML.mk_expr (ML.Evar pv) (ML.I pv.pv_ity) eff_empty in
Mário Pereira's avatar
Mário Pereira committed
448 449 450 451 452 453 454 455 456
      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

457 458 459 460 461 462
  (* 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
463 464 465 466
  let params = function
    | []   -> []
    | args -> let args = filter_params args in
      if args = [] then [ML.mk_var_unit ()] else args
467

Mário Pereira's avatar
Mário Pereira committed
468 469
  let filter_params_cty p def pvl cty_args =
    let rec loop = function
Mário Pereira's avatar
Mário Pereira committed
470
      | [], _ -> []
Mário Pereira's avatar
Mário Pereira committed
471 472 473 474 475 476 477 478 479 480
      | 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
481
  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
482 483 484 485 486 487
    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
488
      let for_id  = id_fresh "for_loop_to" in
Mário Pereira's avatar
Mário Pereira committed
489
      let for_cty = create_cty [i_pv] [] [] Mxs.empty
Mário Pereira's avatar
Mário Pereira committed
490
                               Mpv.empty eff ity_unit in
Mário Pereira's avatar
Mário Pereira committed
491 492 493
      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
494 495
                            (ML.I ity_bool) eff_empty in
      let next_expr =
Mário Pereira's avatar
Mário Pereira committed
496
        let one_const = Number.int_const_dec "1" in
Mário Pereira's avatar
Mário Pereira committed
497
        let one_expr  =
Mário Pereira's avatar
Mário Pereira committed
498
          ML.mk_expr (ML.Econst one_const) ML.ity_int eff_empty in
Mário Pereira's avatar
Mário Pereira committed
499 500
        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
501
       let rec_call  =
Mário Pereira's avatar
Mário Pereira committed
502
        ML.mk_expr (ML.Eapp (for_rs, [next_expr]))
Mário Pereira's avatar
Mário Pereira committed
503
                    ML.ity_unit eff in
Mário Pereira's avatar
Mário Pereira committed
504
      let seq_expr =
Mário Pereira's avatar
Mário Pereira committed
505
        ML.mk_expr (ML.eseq body_expr rec_call) ML.ity_unit eff in
Mário Pereira's avatar
Mário Pereira committed
506 507
      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
508
    let for_call_expr   =
Mário Pereira's avatar
Mário Pereira committed
509
      let for_call      = ML.Eapp (for_rs, [from_expr]) in
Mário Pereira's avatar
Mário Pereira committed
510 511
      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
512
    let args = [ pv_name  i_pv, ty_int, false ] in
Mário Pereira's avatar
Mário Pereira committed
513
    let for_rec_def = {
Mário Pereira's avatar
Mário Pereira committed
514 515
      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
516
      ML.rec_res  = ML.tunit;
Mário Pereira's avatar
Mário Pereira committed
517
    } in
Mário Pereira's avatar
Mário Pereira committed
518
    let for_let = ML.Elet (ML.Lrec [for_rec_def], for_call_expr) in
Mário Pereira's avatar
Mário Pereira committed
519 520 521 522
    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 =
523
      let ns = (Opt.get info.ML.from_mod).mod_export in
Mário Pereira's avatar
Mário Pereira committed
524 525 526 527 528
      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 =
529
      let ns = (Opt.get info.ML.from_mod).mod_export in
Mário Pereira's avatar
Mário Pereira committed
530 531 532
      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
533 534
  exception ExtractionAny

Mário Pereira's avatar
Mário Pereira committed
535
  (* expressions *)
536
  let rec expr info ({e_effect = eff} as e) =
Mário Pereira's avatar
Mário Pereira committed
537
    assert (not eff.eff_ghost);
Mário Pereira's avatar
Mário Pereira committed
538
    match e.e_node with
539
    | Econst c ->
Mário Pereira's avatar
Mário Pereira committed
540 541
      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
542 543
    | Evar pv ->
      ML.mk_expr (ML.Evar pv) (ML.I e.e_ity) eff
544
    | Elet (LDvar (_, e1), e2) when e_ghost e1 ->
Mário Pereira's avatar
Mário Pereira committed
545
      expr info e2
546 547 548 549
    | Elet (LDvar (_, e1), e2) when e_ghost e2 ->
      ML.mk_expr (ML.eseq (expr info e1) ML.mk_unit) ML.ity_unit eff
    | Elet (LDvar (pv, e1), e2) when pv.pv_ghost ||
                                     not (Mpv.mem pv e2.e_effect.eff_reads) ->
Mário Pereira's avatar
Mário Pereira committed
550
      ML.mk_expr (ML.eseq (expr info e1) (expr info e2)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
551 552
    | Elet (LDvar (pv, e1), e2) ->
      let ml_let = ML.mk_let_var pv (expr info e1) (expr info e2) in
553 554
      ML.mk_expr ml_let (ML.I e.e_ity) eff
    | Elet (LDsym (rs, {c_node = Cfun ef; c_cty = cty}), ein) ->
555
      let args = params cty.cty_args in
556 557
      let ef = expr info ef in
      let ein = expr info ein in
Mário Pereira's avatar
Mário Pereira committed
558 559
      let res = ity cty.cty_result in
      let ml_letrec = ML.Elet (ML.Lsym (rs, res, args, ef), ein) in
560
      ML.mk_expr ml_letrec (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
561 562
    | 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
563 564
      (* partial application of constructor *)
      let eta_app = mk_eta_expansion rs_app pvl cty in
Mário Pereira's avatar
Mário Pereira committed
565
      let ein = expr info ein in
Mário Pereira's avatar
Mário Pereira committed
566 567 568
      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
569
      let ml_letrec = ML.Elet (ML.Lsym (rsf, res, [], eta_app), ein) in
Mário Pereira's avatar
Mário Pereira committed
570 571
      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) ->
572
      (* partial application *)
Mário Pereira's avatar
Mário Pereira committed
573
      let pvl = app pvl rs_app.rs_cty.cty_args in
574
      let eapp =
Mário Pereira's avatar
Mário Pereira committed
575
        ML.mk_expr (ML.Eapp (rs_app, pvl)) (ML.C cty) cty.cty_effect in
Mário Pereira's avatar
Mário Pereira committed
576 577
      let ein  = expr info ein in
      let res  = ity cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
578
      let args = params cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
579
      let ml_letrec = ML.Elet (ML.Lsym (rsf, res, args, eapp), ein) in
Mário Pereira's avatar
Mário Pereira committed
580 581 582 583
      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
584
        List.map (fun rdef -> match rdef with
Mário Pereira's avatar
Mário Pereira committed
585 586
          | {rec_sym = rs1; rec_rsym = rs2;
             rec_fun = {c_node = Cfun ef; c_cty = cty}} ->
Mário Pereira's avatar
Mário Pereira committed
587
            let res  = ity rs1.rs_cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
588 589
            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
590
              ML.rec_args = args; ML.rec_exp  = ef ; ML.rec_res  = res }
Mário Pereira's avatar
Mário Pereira committed
591 592 593
          | _ -> assert false) rdefl
      in
      let ml_letrec = ML.Elet (ML.Lrec rdefl, ein) in
594
      ML.mk_expr ml_letrec (ML.I e.e_ity) e.e_effect
595 596
    | Eexec ({c_node = Capp (rs, [])}, _) when is_rs_tuple rs ->
      ML.mk_unit
597 598
    | Eexec ({c_node = Capp (rs, _)}, _) when is_empty_record info rs ->
      ML.mk_unit
599 600
    | Eexec ({c_node = Capp (rs, _)}, _) when rs_ghost rs ->
      ML.mk_unit
Mário Pereira's avatar
Mário Pereira committed
601
    | Eexec ({c_node = Capp (rs, pvl); c_cty = cty}, _)
Mário Pereira's avatar
Mário Pereira committed
602 603
      when isconstructor info rs && cty.cty_args <> [] ->
      (* partial application of constructors *)
Mário Pereira's avatar
Mário Pereira committed
604
      mk_eta_expansion rs pvl cty
Mário Pereira's avatar
Mário Pereira committed
605
    | Eexec ({c_node = Capp (rs, pvl); _}, _) ->
Mário Pereira's avatar
Mário Pereira committed
606
      let pvl = app pvl rs.rs_cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
607
      begin match pvl with
608
      | [pv_expr] when is_optimizable_record_rs info rs -> pv_expr
Mário Pereira's avatar
Mário Pereira committed
609 610 611 612
      | _ -> ML.mk_expr (ML.Eapp (rs, pvl)) (ML.I e.e_ity) eff end
    | Eexec ({c_node = Cfun e; c_cty = {cty_args = []}}, _) ->
      (* abstract block *)
      expr info e
613
    | Eexec ({c_node = Cfun e; c_cty = cty}, _) ->
614
      let args = params cty.cty_args in
615
      ML.mk_expr (ML.Efun (args, expr info e)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
616
    | Eexec ({c_node = Cany}, _) -> (* raise ExtractionAny *)
Mário Pereira's avatar
Mário Pereira committed
617
      ML.mk_hole
618
    | Eabsurd ->
619 620 621
      ML.mk_expr ML.Eabsurd (ML.I e.e_ity) eff
    | Ecase (e1, _) when e_ghost e1 ->
      ML.mk_unit
622
    | Ecase (e1, pl) ->
Mário Pereira's avatar
Mário Pereira committed
623 624 625
      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
626
    | Eassert _ -> ML.mk_unit
627
    | Eif (e1, e2, e3) ->
Mário Pereira's avatar
Mário Pereira committed
628 629 630 631
      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
632 633 634 635
    | 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
636
    | Efor (pv1, (pv2, To, pv3), _, efor) ->
Mário Pereira's avatar
Mário Pereira committed
637
      let efor = expr info efor in
Mário Pereira's avatar
Mário Pereira committed
638 639 640 641
      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
642
    | Eghost _ -> assert false
643 644
    | Eassign al ->
      ML.mk_expr (ML.Eassign al) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
645
    | Epure _ -> (* assert false (\*TODO*\) *) ML.mk_hole
Mário Pereira's avatar
Mário Pereira committed
646 647 648 649 650 651
    | 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
652 653 654
    | Eraise (xs, ex) ->
      let ex =
        match expr info ex with
Mário Pereira's avatar
Mário Pereira committed
655
        | {ML.e_node = ML.Eblock []} -> None
Mário Pereira's avatar
Mário Pereira committed
656 657
        | e -> Some e
      in
Mário Pereira's avatar
Mário Pereira committed
658
      ML.mk_expr (ML.Eraise (xs, ex)) (ML.I e.e_ity) eff
Mário Pereira's avatar
Mário Pereira committed
659 660 661 662
    | Elet (LDsym (_, {c_node=(Cany|Cpur (_, _)); _ }), _)
    (*   assert false (\*TODO*\) *)
    | Eexec ({c_node=Cpur (_, _); _ }, _) -> ML.mk_hole
    (*   assert false (\*TODO*\) *)
663

Mário Pereira's avatar
Mário Pereira committed
664 665
  and ebranch info ({pp_pat = p}, e) =
    (pat p, expr info e)
666

667 668 669 670
  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
671
  let tdef itd =
672
    let s = itd.itd_its in
673 674 675
    let ddata_constructs = (* point-free *)
      List.map (fun ({rs_cty = rsc} as rs) ->
          rs.rs_name,
Mário Pereira's avatar
Mário Pereira committed
676
          let args = List.filter pv_not_ghost rsc.cty_args in
677 678
          List.map (fun {pv_vs = vs} -> type_ vs.vs_ty) args)
    in
Mário Pereira's avatar
Mário Pereira committed
679
    let drecord_fields ({rs_cty = rsc} as rs) =
Mário Pereira's avatar
Mário Pereira committed
680 681 682
      (List.exists (pv_equal (Opt.get rs.rs_field)) s.its_mfields),
      rs.rs_name,
      ity rsc.cty_result
683 684 685 686
    in
    let id = s.its_ts.ts_name in
    let is_private = s.its_private in
    let args = s.its_ts.ts_args in
687 688
    begin match s.its_def, itd.itd_constructors, itd.itd_fields with
      | None, [], [] ->
Mário Pereira's avatar
Mário Pereira committed
689
        ML.mk_its_defn id args is_private None
690
      | None, cl, [] ->
Mário Pereira's avatar
Mário Pereira committed
691 692
        let cl = ddata_constructs cl in
        ML.mk_its_defn id args is_private (Some (ML.Ddata cl))
693
      | None, _, pjl ->
Mário Pereira's avatar
Mário Pereira committed
694 695
        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
696
        begin match pjl with
697 698
          | [] -> ML.mk_its_defn id args is_private (Some (ML.Dalias ML.tunit))
          | [_, _, ty_pj] when is_optimizable_record_itd itd ->
Mário Pereira's avatar
Mário Pereira committed
699 700 701
            ML.mk_its_defn id args is_private (Some (ML.Dalias ty_pj))
          | pjl -> ML.mk_its_defn id args is_private (Some (ML.Drecord pjl))
        end
702
      | Some t, _, _ ->
703
         ML.mk_its_defn id args is_private (Some (ML.Dalias (ity t)))
704
    end
Mário Pereira's avatar
Mário Pereira committed
705

Mário Pereira's avatar
Mário Pereira committed
706
  exception ExtractionVal of rsymbol
Mário Pereira's avatar
Mário Pereira committed
707

Mário Pereira's avatar
Mário Pereira committed
708 709 710 711
  let is_val = function
    | Eexec ({c_node = Cany}, _) -> true
    | _ -> false

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
    | PDlet (LDsym (_rs, {c_node = Cany})) ->
      []
      (* raise (ExtractionVal _rs) *)
Mário Pereira's avatar
Mário Pereira committed
720 721
    | PDlet (LDsym (_, {c_node = Cfun e})) when is_val e.e_node ->
      []
722
    | PDlet (LDsym ({rs_cty = cty} as rs, {c_node = Cfun e})) ->
723
      let args = params cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
724
      let res  = ity cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
725
      [ML.Dlet (ML.Lsym (rs, res, args, expr info e))]
726
    | PDlet (LDrec rl) ->
Mário Pereira's avatar
Mário Pereira committed
727
      let def {rec_fun = e; rec_sym = rs1; rec_rsym = rs2} =
Mário Pereira's avatar
Mário Pereira committed
728
        let e = match e.c_node with Cfun e -> e | _ -> assert false in
Mário Pereira's avatar
Mário Pereira committed
729
        let args = params rs1.rs_cty.cty_args in
Mário Pereira's avatar
Mário Pereira committed
730
        let res  = ity rs1.rs_cty.cty_result in
Mário Pereira's avatar
Mário Pereira committed
731
        { ML.rec_sym  = rs1;  ML.rec_rsym = rs2;
Mário Pereira's avatar
Mário Pereira committed
732 733
          ML.rec_args = args; ML.rec_exp  = expr info e;
          ML.rec_res  = res } in
Mário Pereira's avatar
Mário Pereira committed
734
      let rec_def = filter_ghost_rdef def rl in
Mário Pereira's avatar
Mário Pereira committed
735 736
      [ML.Dlet (ML.Lrec rec_def)]
    | PDlet (LDsym _) | PDpure | PDlet (LDvar _) ->
737
      []
738
    | PDtype itl ->
Mário Pereira's avatar
Mário Pereira committed
739
      let itsd = List.map tdef itl in
Mário Pereira's avatar
Mário Pereira committed
740
      [ML.Dtype itsd]
741
    | PDexn xs ->
Mário Pereira's avatar
Mário Pereira committed
742 743
      if ity_equal xs.xs_ity ity_unit then [ML.Dexn (xs, None)]
      else [ML.Dexn (xs, Some (ity xs.xs_ity))]
Mário Pereira's avatar
Mário Pereira committed
744

Mário Pereira's avatar
Mário Pereira committed
745
  let pdecl_m m pd =
746 747
    let info = { ML.from_mod = Some m; ML.from_km  = m.mod_known; } in
    pdecl Sid.empty info pd
Mário Pereira's avatar
Mário Pereira committed
748

Mário Pereira's avatar
Mário Pereira committed
749
  (* unit module declarations *)
750 751 752
  let rec mdecl pids info = function
    | Udecl pd -> pdecl pids info pd
    | Uscope (_, _, l) -> List.concat (List.map (mdecl pids info) l)
753
    | Uuse _ | Uclone _ | Umeta _ -> []
Mário Pereira's avatar
Mário Pereira committed
754

755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795
  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
    | Uscope (_, _, l) -> List.for_all empty_munit l
    | 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

  let make_param from mi =
    let id = mi.mi_mod.mod_theory.Theory.th_name in
    Format.printf "param %s@." id.id_string;
    let dl =
      List.concat (List.map (mdecl Sid.empty from) mi.mi_mod.mod_units) in
    ML.Dclone (id, dl)

  let ids_of_params pids mi =
    Mid.fold (fun id _ pids -> Sid.add id pids) mi.mi_mod.mod_known pids

Mário Pereira's avatar
Mário Pereira committed
796
  (* modules *)
Mário Pereira's avatar
Mário Pereira committed
797
  let module_ m =
798 799 800 801 802
    let from = { ML.from_mod = Some m; ML.from_km = m.mod_known; } in
    let params = find_params m.mod_units in
    let pids = List.fold_left ids_of_params Sid.empty params in
    let mod_decl = List.concat (List.map (mdecl pids from) m.mod_units) in
    let mod_decl = List.map (make_param from) params @ mod_decl in
Mário Pereira's avatar
Mário Pereira committed
803 804 805 806
    let add known_map decl =
      let idl = ML.get_decl_name decl in
      List.fold_left (ML.add_known_decl decl) known_map idl in
    let mod_known = List.fold_left add Mid.empty mod_decl in
807
    { ML.mod_from = from; ML.mod_decl = mod_decl; ML.mod_known = mod_known }
Mário Pereira's avatar
Mário Pereira committed
808

Mário Pereira's avatar
Mário Pereira committed
809 810 811 812 813 814 815 816
  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
817 818
end

819 820 821 822 823 824 825 826
(** Some transformations *)

module Transform = struct

  open ML

  type subst = expr Mpv.t

Mário Pereira's avatar
Mário Pereira committed
827
  let rec expr info subst e =
828
    let mk n = { e with e_node = n } in
Mário Pereira's avatar
Mário Pereira committed
829
    let add_subst pv e1 e2 = expr info (Mpv.add pv e1 subst) e2 in
830
    match e.e_node with
831 832 833 834 835 836 837 838 839 840 841
    | Evar pv -> (try Mpv.find pv subst with Not_found -> e)
    (* | Elet (Lvar (pv, ({e_node = Econst _ } as e1)), e2) *)
    (* | Elet (Lvar (pv, ({e_node = Eblock []} as e1)), e2) *)
    (*   when Slab.mem Expr.proxy_label pv.pv_vs.vs_name.id_label -> *)
    (*   add_subst pv e1 e2 *)
    (* | Elet (Lvar (pv, ({e_node = Eapp (rs, _)} as e1)), e2) *)
    (*   when Translate.isconstructor info rs && *)
    (*        Slab.mem Expr.proxy_label pv.pv_vs.vs_name.id_label -> *)
    (*   (\* because of Lvar we know the constructor is completely applied *\) *)
    (*   add_subst pv e1 e2 *)
    | Elet (Lvar (pv, e1), e2)
Mário Pereira's avatar
Mário Pereira committed
842 843
      when Slab.mem Expr.proxy_label pv.pv_vs.vs_name.id_label &&
           eff_pure e1.e_effect ->
844
      let e1 = expr info subst e1 in
Mário Pereira's avatar
Mário Pereira committed
845
      add_subst pv e1 e2
846
    | Elet (ld, e) ->
Mário Pereira's avatar
Mário Pereira committed
847
      mk (Elet (let_def info subst ld, expr info subst e))
848
    | Eapp (rs, el) ->
Mário Pereira's avatar
Mário Pereira committed
849
      mk (Eapp (rs, List.map (expr info subst) el))
850
    | Efun (vl, e) ->
Mário Pereira's avatar
Mário Pereira committed
851
      mk (Efun (vl, expr info subst e))
852
    | Eif (e1, e2, e3) ->
Mário Pereira's avatar
Mário Pereira committed
853
      mk (Eif (expr info subst e1, expr info subst e2, expr info subst e3))
854
    | Ematch (e, bl) ->
Mário Pereira's avatar
Mário Pereira committed
855
      mk (Ematch (expr info subst e, List.map (branch info subst) bl))
856
    | Eblock el ->
Mário Pereira's avatar
Mário Pereira committed
857
      mk (Eblock (List.map (expr info subst) el))
858
    | Ewhile (e1, e2) ->
Mário Pereira's avatar
Mário Pereira committed
859
      mk (Ewhile (expr info subst e1, expr info subst e2))
860
    | Efor (x, pv1, dir, pv2, e) ->
Mário Pereira's avatar
Mário Pereira committed
861
      let e = mk (Efor (x, pv1, dir, pv2, expr info subst e)) in
862 863 864
      (* 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
865
      mk (Eraise (exn, Opt.map (expr info subst) eo))
866
    | Etry (e, bl) ->
Mário Pereira's avatar
Mário Pereira committed
867
      mk (Etry (expr info subst e, List.map (xbranch info subst) bl))
868 869 870
    | Eassign al ->
      let assign e (_, _, pv) = mk_let subst pv e in
      List.fold_left assign e al
Mário Pereira's avatar
Mário Pereira committed
871
    | Econst _ | Eabsurd | Ehole -> e
872 873 874 875 876 877 878

  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
879 880
  and branch info subst (pat, e) = pat, expr info subst e
  and xbranch info subst (exn, pat, e) = exn, pat, expr info subst e
Jean-Christophe Filliâtre's avatar