## lustrec / src / typing.ml @ 7291cb80

History | View | Annotate | Download (26.4 KB)

1 |
(* ---------------------------------------------------------------------------- |
---|---|

2 |
* SchedMCore - A MultiCore Scheduling Framework |

3 |
* Copyright (C) 2009-2011, ONERA, Toulouse, FRANCE - LIFL, Lille, FRANCE |

4 |
* |

5 |
* This file is part of Prelude |

6 |
* |

7 |
* Prelude is free software; you can redistribute it and/or |

8 |
* modify it under the terms of the GNU Lesser General Public License |

9 |
* as published by the Free Software Foundation ; either version 2 of |

10 |
* the License, or (at your option) any later version. |

11 |
* |

12 |
* Prelude is distributed in the hope that it will be useful, but |

13 |
* WITHOUT ANY WARRANTY ; without even the implied warranty of |

14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |

15 |
* Lesser General Public License for more details. |

16 |
* |

17 |
* You should have received a copy of the GNU Lesser General Public |

18 |
* License along with this program ; if not, write to the Free Software |

19 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |

20 |
* USA |

21 |
*---------------------------------------------------------------------------- *) |

22 | |

23 |
(** Main typing module. Classic inference algorithm with destructive |

24 |
unification. *) |

25 | |

26 |
let debug fmt args = () (* Format.eprintf "%a" *) |

27 |
(* Though it shares similarities with the clock calculus module, no code |

28 |
is shared. Simple environments, very limited identifier scoping, no |

29 |
identifier redefinition allowed. *) |

30 | |

31 |
open Utils |

32 |
(* Yes, opening both modules is dirty as some type names will be |

33 |
overwritten, yet this makes notations far lighter.*) |

34 |
open LustreSpec |

35 |
open Corelang |

36 |
open Types |

37 |
open Format |

38 | |

39 |
let pp_typing_env fmt env = |

40 |
Env.pp_env print_ty fmt env |

41 | |

42 |
(** [occurs tvar ty] returns true if the type variable [tvar] occurs in |

43 |
type [ty]. False otherwise. *) |

44 |
let rec occurs tvar ty = |

45 |
let ty = repr ty in |

46 |
match ty.tdesc with |

47 |
| Tvar -> ty=tvar |

48 |
| Tarrow (t1, t2) -> |

49 |
(occurs tvar t1) || (occurs tvar t2) |

50 |
| Ttuple tl -> |

51 |
List.exists (occurs tvar) tl |

52 |
| Tarray (_, t) |

53 |
| Tstatic (_, t) |

54 |
| Tclock t |

55 |
| Tlink t -> occurs tvar t |

56 |
| Tenum _ | Tconst _ | Tunivar | Tint | Treal | Tbool | Trat -> false |

57 | |

58 |
(** Promote monomorphic type variables to polymorphic type variables. *) |

59 |
(* Generalize by side-effects *) |

60 |
let rec generalize ty = |

61 |
match ty.tdesc with |

62 |
| Tvar -> |

63 |
(* No scopes, always generalize *) |

64 |
ty.tdesc <- Tunivar |

65 |
| Tarrow (t1,t2) -> |

66 |
generalize t1; generalize t2 |

67 |
| Ttuple tlist -> |

68 |
List.iter generalize tlist |

69 |
| Tstatic (d, t) |

70 |
| Tarray (d, t) -> Dimension.generalize d; generalize t |

71 |
| Tclock t |

72 |
| Tlink t -> |

73 |
generalize t |

74 |
| Tenum _ | Tconst _ | Tunivar | Tint | Treal | Tbool | Trat -> () |

75 | |

76 |
(** Downgrade polymorphic type variables to monomorphic type variables *) |

77 |
let rec instantiate inst_vars inst_dim_vars ty = |

78 |
let ty = repr ty in |

79 |
match ty.tdesc with |

80 |
| Tenum _ | Tconst _ | Tvar | Tint | Treal | Tbool | Trat -> ty |

81 |
| Tarrow (t1,t2) -> |

82 |
{ty with tdesc = |

83 |
Tarrow ((instantiate inst_vars inst_dim_vars t1), (instantiate inst_vars inst_dim_vars t2))} |

84 |
| Ttuple tlist -> |

85 |
{ty with tdesc = Ttuple (List.map (instantiate inst_vars inst_dim_vars) tlist)} |

86 |
| Tclock t -> |

87 |
{ty with tdesc = Tclock (instantiate inst_vars inst_dim_vars t)} |

88 |
| Tstatic (d, t) -> |

89 |
{ty with tdesc = Tstatic (Dimension.instantiate inst_dim_vars d, instantiate inst_vars inst_dim_vars t)} |

90 |
| Tarray (d, t) -> |

91 |
{ty with tdesc = Tarray (Dimension.instantiate inst_dim_vars d, instantiate inst_vars inst_dim_vars t)} |

92 |
| Tlink t -> |

93 |
(* should not happen *) |

94 |
{ty with tdesc = Tlink (instantiate inst_vars inst_dim_vars t)} |

95 |
| Tunivar -> |

96 |
try |

97 |
List.assoc ty.tid !inst_vars |

98 |
with Not_found -> |

99 |
let var = new_var () in |

100 |
inst_vars := (ty.tid, var)::!inst_vars; |

101 |
var |

102 | |

103 |
(* [type_coretype cty] types the type declaration [cty] *) |

104 |
let rec type_coretype type_dim cty = |

105 |
match (*get_repr_type*) cty with |

106 |
| Tydec_any -> new_var () |

107 |
| Tydec_int -> Type_predef.type_int |

108 |
| Tydec_real -> Type_predef.type_real |

109 |
| Tydec_float -> Type_predef.type_real |

110 |
| Tydec_bool -> Type_predef.type_bool |

111 |
| Tydec_clock ty -> Type_predef.type_clock (type_coretype type_dim ty) |

112 |
| Tydec_const c -> Type_predef.type_const c |

113 |
| Tydec_enum tl -> Type_predef.type_enum tl |

114 |
| Tydec_array (d, ty) -> |

115 |
begin |

116 |
type_dim d; |

117 |
Type_predef.type_array d (type_coretype type_dim ty) |

118 |
end |

119 | |

120 |
(* [coretype_type is the reciprocal of [type_typecore] *) |

121 |
let rec coretype_type ty = |

122 |
match (repr ty).tdesc with |

123 |
| Tvar -> Tydec_any |

124 |
| Tint -> Tydec_int |

125 |
| Treal -> Tydec_real |

126 |
| Tbool -> Tydec_bool |

127 |
| Tconst c -> Tydec_const c |

128 |
| Tclock t -> Tydec_clock (coretype_type t) |

129 |
| Tenum tl -> Tydec_enum tl |

130 |
| Tarray (d, t) -> Tydec_array (d, coretype_type t) |

131 |
| Tstatic (_, t) -> coretype_type t |

132 |
| _ -> assert false |

133 | |

134 |
let get_type_definition tname = |

135 |
try |

136 |
type_coretype (fun d -> ()) (Hashtbl.find type_table (Tydec_const tname)) |

137 |
with Not_found -> raise (Error (Location.dummy_loc, Unbound_type tname)) |

138 | |

139 |
(** [unify t1 t2] unifies types [t1] and [t2]. Raises [Unify |

140 |
(t1,t2)] if the types are not unifiable.*) |

141 |
(* Standard destructive unification *) |

142 |
let rec unify t1 t2 = |

143 |
let t1 = repr t1 in |

144 |
let t2 = repr t2 in |

145 |
if t1=t2 then |

146 |
() |

147 |
else |

148 |
(* No type abbreviations resolution for now *) |

149 |
match t1.tdesc,t2.tdesc with |

150 |
(* This case is not mandory but will keep "older" types *) |

151 |
| Tvar, Tvar -> |

152 |
if t1.tid < t2.tid then |

153 |
t2.tdesc <- Tlink t1 |

154 |
else |

155 |
t1.tdesc <- Tlink t2 |

156 |
| (Tvar, _) when (not (occurs t1 t2)) -> |

157 |
t1.tdesc <- Tlink t2 |

158 |
| (_,Tvar) when (not (occurs t2 t1)) -> |

159 |
t2.tdesc <- Tlink t1 |

160 |
| Tarrow (t1,t2), Tarrow (t1',t2') -> |

161 |
begin |

162 |
unify t1 t1'; |

163 |
unify t2 t2' |

164 |
end |

165 |
| Ttuple tlist1, Ttuple tlist2 -> |

166 |
if (List.length tlist1) <> (List.length tlist2) then |

167 |
raise (Unify (t1, t2)) |

168 |
else |

169 |
List.iter2 unify tlist1 tlist2 |

170 |
| Tclock _, Tstatic _ |

171 |
| Tstatic _, Tclock _ -> raise (Unify (t1, t2)) |

172 |
| Tclock t1', _ -> unify t1' t2 |

173 |
| _, Tclock t2' -> unify t1 t2' |

174 |
| Tint, Tint | Tbool, Tbool | Trat, Trat |

175 |
| Tunivar, _ | _, Tunivar -> () |

176 |
| (Tconst t, _) -> |

177 |
let def_t = get_type_definition t in |

178 |
unify def_t t2 |

179 |
| (_, Tconst t) -> |

180 |
let def_t = get_type_definition t in |

181 |
unify t1 def_t |

182 |
| Tenum tl, Tenum tl' when tl == tl' -> () |

183 |
| Tstatic (e1, t1'), Tstatic (e2, t2') |

184 |
| Tarray (e1, t1'), Tarray (e2, t2') -> |

185 |
begin |

186 |
unify t1' t2'; |

187 |
Dimension.eval Basic_library.eval_env (fun c -> None) e1; |

188 |
Dimension.eval Basic_library.eval_env (fun c -> None) e2; |

189 |
Dimension.unify e1 e2; |

190 |
end |

191 |
| _,_ -> raise (Unify (t1, t2)) |

192 | |

193 |
(** [semi_unify t1 t2] checks whether type [t1] is an instance of type [t2]. Raises [Unify |

194 |
(t1,t2)] if the types are not semi-unifiable.*) |

195 |
(* Standard destructive semi-unification *) |

196 |
let rec semi_unify t1 t2 = |

197 |
let t1 = repr t1 in |

198 |
let t2 = repr t2 in |

199 |
if t1=t2 then |

200 |
() |

201 |
else |

202 |
(* No type abbreviations resolution for now *) |

203 |
match t1.tdesc,t2.tdesc with |

204 |
(* This case is not mandory but will keep "older" types *) |

205 |
| Tvar, Tvar -> |

206 |
if t1.tid < t2.tid then |

207 |
t2.tdesc <- Tlink t1 |

208 |
else |

209 |
t1.tdesc <- Tlink t2 |

210 |
| (Tvar, _) -> raise (Unify (t1, t2)) |

211 |
| (_,Tvar) when (not (occurs t2 t1)) -> |

212 |
t2.tdesc <- Tlink t1 |

213 |
| Tarrow (t1,t2), Tarrow (t1',t2') -> |

214 |
begin |

215 |
semi_unify t1 t1'; |

216 |
semi_unify t2 t2' |

217 |
end |

218 |
| Ttuple tlist1, Ttuple tlist2 -> |

219 |
if (List.length tlist1) <> (List.length tlist2) then |

220 |
raise (Unify (t1, t2)) |

221 |
else |

222 |
List.iter2 semi_unify tlist1 tlist2 |

223 |
| Tclock _, Tstatic _ |

224 |
| Tstatic _, Tclock _ -> raise (Unify (t1, t2)) |

225 |
| Tclock t1', _ -> semi_unify t1' t2 |

226 |
| _, Tclock t2' -> semi_unify t1 t2' |

227 |
| Tint, Tint | Tbool, Tbool | Trat, Trat |

228 |
| Tunivar, _ | _, Tunivar -> () |

229 |
| (Tconst t, _) -> |

230 |
let def_t = get_type_definition t in |

231 |
semi_unify def_t t2 |

232 |
| (_, Tconst t) -> |

233 |
let def_t = get_type_definition t in |

234 |
semi_unify t1 def_t |

235 |
| Tenum tl, Tenum tl' when tl == tl' -> () |

236 |
| Tstatic (e1, t1'), Tstatic (e2, t2') |

237 |
| Tarray (e1, t1'), Tarray (e2, t2') -> |

238 |
begin |

239 |
semi_unify t1' t2'; |

240 |
Dimension.eval Basic_library.eval_env (fun c -> Some (Dimension.mkdim_ident Location.dummy_loc c)) e1; |

241 |
Dimension.eval Basic_library.eval_env (fun c -> Some (Dimension.mkdim_ident Location.dummy_loc c)) e2; |

242 |
Dimension.semi_unify e1 e2; |

243 |
end |

244 |
| _,_ -> raise (Unify (t1, t2)) |

245 | |

246 |
let try_unify ty1 ty2 loc = |

247 |
try |

248 |
unify ty1 ty2 |

249 |
with |

250 |
| Unify _ -> |

251 |
raise (Error (loc, Type_clash (ty1,ty2))) |

252 |
| Dimension.Unify _ -> |

253 |
raise (Error (loc, Type_clash (ty1,ty2))) |

254 | |

255 |
let try_semi_unify ty1 ty2 loc = |

256 |
try |

257 |
semi_unify ty1 ty2 |

258 |
with |

259 |
| Unify _ -> |

260 |
raise (Error (loc, Type_clash (ty1,ty2))) |

261 |
| Dimension.Unify _ -> |

262 |
raise (Error (loc, Type_clash (ty1,ty2))) |

263 | |

264 |
let rec type_const loc c = |

265 |
match c with |

266 |
| Const_int _ -> Type_predef.type_int |

267 |
| Const_real _ -> Type_predef.type_real |

268 |
| Const_float _ -> Type_predef.type_real |

269 |
| Const_array ca -> let d = Dimension.mkdim_int loc (List.length ca) in |

270 |
let ty = new_var () in |

271 |
List.iter (fun e -> try_unify (type_const loc e) ty loc) ca; |

272 |
Type_predef.type_array d ty |

273 |
| Const_tag t -> |

274 |
if Hashtbl.mem tag_table t |

275 |
then type_coretype (fun d -> ()) (Hashtbl.find tag_table t) |

276 |
else raise (Error (loc, Unbound_value ("enum tag " ^ t))) |

277 | |

278 |
(* The following typing functions take as parameter an environment [env] |

279 |
and whether the element being typed is expected to be constant [const]. |

280 |
[env] is a pair composed of: |

281 |
- a map from ident to type, associating to each ident, i.e. |

282 |
variables, constants and (imported) nodes, its type including whether |

283 |
it is constant or not. This latter information helps in checking constant |

284 |
propagation policy in Lustre. |

285 |
- a vdecl list, in order to modify types of declared variables that are |

286 |
later discovered to be clocks during the typing process. |

287 |
*) |

288 |
let check_constant loc const_expected const_real = |

289 |
if const_expected && not const_real |

290 |
then raise (Error (loc, Not_a_constant)) |

291 | |

292 |
let rec type_standard_args env in_main const expr_list = |

293 |
let ty_list = List.map (fun e -> dynamic_type (type_expr env in_main const e)) expr_list in |

294 |
let ty_res = new_var () in |

295 |
List.iter2 (fun e ty -> try_unify ty_res ty e.expr_loc) expr_list ty_list; |

296 |
ty_res |

297 | |

298 |
(* emulates a subtyping relation between types t and (d : t), |

299 |
used during node applications and assignments *) |

300 |
and type_subtyping_arg env in_main ?(sub=true) const real_arg formal_type = |

301 |
let loc = real_arg.expr_loc in |

302 |
let const = const || (Types.get_static_value formal_type <> None) in |

303 |
let real_type = type_expr env in_main const real_arg in |

304 |
let real_type = |

305 |
if const |

306 |
then let d = |

307 |
if is_dimension_type real_type |

308 |
then dimension_of_expr real_arg |

309 |
else Dimension.mkdim_var () in |

310 |
let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in |

311 |
Dimension.eval Basic_library.eval_env eval_const d; |

312 |
let real_static_type = Type_predef.type_static d (Types.dynamic_type real_type) in |

313 |
(match Types.get_static_value real_type with |

314 |
| None -> () |

315 |
| Some d' -> try_unify real_type real_static_type loc); |

316 |
real_static_type |

317 |
else real_type in |

318 |
(*Format.eprintf "subtyping const %B real %a:%a vs formal %a@." const Printers.pp_expr real_arg Types.print_ty real_type Types.print_ty formal_type;*) |

319 |
let real_types = type_list_of_type real_type in |

320 |
let formal_types = type_list_of_type formal_type in |

321 |
if (List.length real_types) <> (List.length formal_types) |

322 |
then raise (Unify (real_type, formal_type)) |

323 |
else List.iter2 (type_subtyping loc sub) real_types formal_types |

324 | |

325 |
and type_subtyping loc sub real_type formal_type = |

326 |
match (repr real_type).tdesc, (repr formal_type).tdesc with |

327 |
| Tstatic _ , Tstatic _ when sub -> try_unify formal_type real_type loc |

328 |
| Tstatic (r_d, r_ty), _ when sub -> try_unify formal_type r_ty loc |

329 |
| _ -> try_unify formal_type real_type loc |

330 | |

331 |
and type_ident env in_main loc const id = |

332 |
type_expr env in_main const (expr_of_ident id loc) |

333 | |

334 |
(* typing an application implies: |

335 |
- checking that const formal parameters match real const (maybe symbolic) arguments |

336 |
- checking type adequation between formal and real arguments |

337 |
*) |

338 |
and type_appl env in_main loc const f args = |

339 |
let tfun = type_ident env in_main loc const f in |

340 |
let tins, touts = split_arrow tfun in |

341 |
let tins = type_list_of_type tins in |

342 |
let args = expr_list_of_expr args in |

343 |
List.iter2 (type_subtyping_arg env in_main const) args tins; |

344 |
touts |

345 | |

346 |
(** [type_expr env in_main expr] types expression [expr] in environment |

347 |
[env], expecting it to be [const] or not. *) |

348 |
and type_expr env in_main const expr = |

349 |
let res = |

350 |
match expr.expr_desc with |

351 |
| Expr_const c -> |

352 |
let ty = type_const expr.expr_loc c in |

353 |
let ty = Type_predef.type_static (Dimension.mkdim_var ()) ty in |

354 |
expr.expr_type <- ty; |

355 |
ty |

356 |
| Expr_ident v -> |

357 |
let tyv = |

358 |
try |

359 |
Env.lookup_value (fst env) v |

360 |
with Not_found -> |

361 |
Format.eprintf "Failure in typing expr %a@." Printers.pp_expr expr; |

362 |
raise (Error (expr.expr_loc, Unbound_value ("identifier " ^ v))) |

363 |
in |

364 |
let ty = instantiate (ref []) (ref []) tyv in |

365 |
let ty' = |

366 |
if const |

367 |
then Type_predef.type_static (Dimension.mkdim_var ()) (new_var ()) |

368 |
else new_var () in |

369 |
try_unify ty ty' expr.expr_loc; |

370 |
expr.expr_type <- ty; |

371 |
ty |

372 |
| Expr_array elist -> |

373 |
let ty_elt = type_standard_args env in_main const elist in |

374 |
let d = Dimension.mkdim_int expr.expr_loc (List.length elist) in |

375 |
let ty = Type_predef.type_array d ty_elt in |

376 |
expr.expr_type <- ty; |

377 |
ty |

378 |
| Expr_access (e1, d) -> |

379 |
type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int; |

380 |
let ty_elt = new_var () in |

381 |
let d = Dimension.mkdim_var () in |

382 |
type_subtyping_arg env in_main const e1 (Type_predef.type_array d ty_elt); |

383 |
expr.expr_type <- ty_elt; |

384 |
ty_elt |

385 |
| Expr_power (e1, d) -> |

386 |
let eval_const id = Types.get_static_value (Env.lookup_value (fst env) id) in |

387 |
type_subtyping_arg env in_main true (expr_of_dimension d) Type_predef.type_int; |

388 |
Dimension.eval Basic_library.eval_env eval_const d; |

389 |
let ty_elt = type_standard_args env in_main const [e1] in |

390 |
let ty = Type_predef.type_array d ty_elt in |

391 |
expr.expr_type <- ty; |

392 |
ty |

393 |
| Expr_tuple elist -> |

394 |
let ty = new_ty (Ttuple (List.map (type_expr env in_main const) elist)) in |

395 |
expr.expr_type <- ty; |

396 |
ty |

397 |
| Expr_ite (c, t, e) -> |

398 |
type_subtyping_arg env in_main const c Type_predef.type_bool; |

399 |
let ty = type_standard_args env in_main const [t; e] in |

400 |
expr.expr_type <- ty; |

401 |
ty |

402 |
| Expr_appl (id, args, r) -> |

403 |
(* application of non internal function is not legal in a constant |

404 |
expression *) |

405 |
(match r with |

406 |
| None -> () |

407 |
| Some (x, l) -> |

408 |
check_constant expr.expr_loc const false; |

409 |
let expr_x = expr_of_ident x expr.expr_loc in |

410 |
let typ_l = |

411 |
Type_predef.type_clock |

412 |
(type_const expr.expr_loc (Const_tag l)) in |

413 |
type_subtyping_arg env in_main ~sub:false const expr_x typ_l); |

414 |
let touts = type_appl env in_main expr.expr_loc const id args in |

415 |
expr.expr_type <- touts; |

416 |
touts |

417 |
| Expr_fby (e1,e2) |

418 |
| Expr_arrow (e1,e2) -> |

419 |
(* fby/arrow is not legal in a constant expression *) |

420 |
check_constant expr.expr_loc const false; |

421 |
let ty = type_standard_args env in_main const [e1; e2] in |

422 |
expr.expr_type <- ty; |

423 |
ty |

424 |
| Expr_pre e -> |

425 |
(* pre is not legal in a constant expression *) |

426 |
check_constant expr.expr_loc const false; |

427 |
let ty = type_standard_args env in_main const [e] in |

428 |
expr.expr_type <- ty; |

429 |
ty |

430 |
| Expr_when (e1,c,l) -> |

431 |
(* when is not legal in a constant expression *) |

432 |
check_constant expr.expr_loc const false; |

433 |
let typ_l = Type_predef.type_clock (type_const expr.expr_loc (Const_tag l)) in |

434 |
let expr_c = expr_of_ident c expr.expr_loc in |

435 |
type_subtyping_arg env in_main ~sub:false const expr_c typ_l; |

436 |
update_clock env in_main c expr.expr_loc typ_l; |

437 |
let ty = type_standard_args env in_main const [e1] in |

438 |
expr.expr_type <- ty; |

439 |
ty |

440 |
| Expr_merge (c,hl) -> |

441 |
(* merge is not legal in a constant expression *) |

442 |
check_constant expr.expr_loc const false; |

443 |
let typ_in, typ_out = type_branches env in_main expr.expr_loc const hl in |

444 |
let expr_c = expr_of_ident c expr.expr_loc in |

445 |
let typ_l = Type_predef.type_clock typ_in in |

446 |
type_subtyping_arg env in_main ~sub:false const expr_c typ_l; |

447 |
update_clock env in_main c expr.expr_loc typ_l; |

448 |
expr.expr_type <- typ_out; |

449 |
typ_out |

450 |
| Expr_uclock (e,k) | Expr_dclock (e,k) -> |

451 |
let ty = type_expr env in_main const e in |

452 |
expr.expr_type <- ty; |

453 |
ty |

454 |
| Expr_phclock (e,q) -> |

455 |
let ty = type_expr env in_main const e in |

456 |
expr.expr_type <- ty; |

457 |
ty |

458 |
in (*Format.eprintf "typing %B %a at %a = %a@." const Printers.pp_expr expr Location.pp_loc expr.expr_loc Types.print_ty res;*) res |

459 | |

460 |
and type_branches env in_main loc const hl = |

461 |
let typ_in = new_var () in |

462 |
let typ_out = new_var () in |

463 |
try |

464 |
let used_labels = |

465 |
List.fold_left (fun accu (t, h) -> |

466 |
unify typ_in (type_const loc (Const_tag t)); |

467 |
type_subtyping_arg env in_main const h typ_out; |

468 |
if List.mem t accu |

469 |
then raise (Error (loc, Already_bound t)) |

470 |
else t :: accu) [] hl in |

471 |
let type_labels = get_enum_type_tags (coretype_type typ_in) in |

472 |
if List.sort compare used_labels <> List.sort compare type_labels |

473 |
then let unbound_tag = List.find (fun t -> not (List.mem t used_labels)) type_labels in |

474 |
raise (Error (loc, Unbound_value ("branching tag " ^ unbound_tag))) |

475 |
else (typ_in, typ_out) |

476 |
with Unify (t1, t2) -> |

477 |
raise (Error (loc, Type_clash (t1,t2))) |

478 | |

479 |
and update_clock env in_main id loc typ = |

480 |
(*Log.report ~level:1 (fun fmt -> Format.fprintf fmt "update_clock %s with %a@ " id print_ty typ);*) |

481 |
try |

482 |
let vdecl = List.find (fun v -> v.var_id = id) (snd env) |

483 |
in vdecl.var_type <- typ |

484 |
with |

485 |
Not_found -> |

486 |
raise (Error (loc, Unbound_value ("clock " ^ id))) |

487 | |

488 |
(** [type_eq env eq] types equation [eq] in environment [env] *) |

489 |
let type_eq env in_main undefined_vars eq = |

490 |
(* Check undefined variables, type lhs *) |

491 |
let expr_lhs = expr_of_expr_list eq.eq_loc (List.map (fun v -> expr_of_ident v eq.eq_loc) eq.eq_lhs) in |

492 |
let ty_lhs = type_expr env in_main false expr_lhs in |

493 |
(* Check multiple variable definitions *) |

494 |
let define_var id uvars = |

495 |
try |

496 |
ignore(IMap.find id uvars); |

497 |
IMap.remove id uvars |

498 |
with Not_found -> |

499 |
raise (Error (eq.eq_loc, Already_defined id)) |

500 |
in |

501 |
let undefined_vars = |

502 |
List.fold_left (fun uvars v -> define_var v uvars) undefined_vars eq.eq_lhs in |

503 |
(* Type rhs wrt to lhs type with subtyping, i.e. a constant rhs value may be assigned |

504 |
to a (always non-constant) lhs variable *) |

505 |
type_subtyping_arg env in_main false eq.eq_rhs ty_lhs; |

506 |
undefined_vars |

507 | |

508 | |

509 |
(* [type_coreclock env ck id loc] types the type clock declaration [ck] |

510 |
in environment [env] *) |

511 |
let type_coreclock env ck id loc = |

512 |
match ck.ck_dec_desc with |

513 |
| Ckdec_any | Ckdec_pclock (_,_) -> () |

514 |
| Ckdec_bool cl -> |

515 |
let dummy_id_expr = expr_of_ident id loc in |

516 |
let when_expr = |

517 |
List.fold_left |

518 |
(fun expr (x, l) -> |

519 |
{expr_tag = new_tag (); |

520 |
expr_desc= Expr_when (expr,x,l); |

521 |
expr_type = new_var (); |

522 |
expr_clock = Clocks.new_var true; |

523 |
expr_delay = Delay.new_var (); |

524 |
expr_loc=loc; |

525 |
expr_annot = None}) |

526 |
dummy_id_expr cl |

527 |
in |

528 |
ignore (type_expr env false false when_expr) |

529 | |

530 |
let rec check_type_declaration loc cty = |

531 |
match cty with |

532 |
| Tydec_clock ty |

533 |
| Tydec_array (_, ty) -> check_type_declaration loc ty |

534 |
| Tydec_const tname -> |

535 |
if not (Hashtbl.mem type_table cty) |

536 |
then raise (Error (loc, Unbound_type tname)); |

537 |
| _ -> () |

538 | |

539 |
let type_var_decl vd_env env vdecl = |

540 |
check_type_declaration vdecl.var_loc vdecl.var_dec_type.ty_dec_desc; |

541 |
let eval_const id = Types.get_static_value (Env.lookup_value env id) in |

542 |
let type_dim d = |

543 |
begin |

544 |
type_subtyping_arg (env, vd_env) false true (expr_of_dimension d) Type_predef.type_int; |

545 |
Dimension.eval Basic_library.eval_env eval_const d; |

546 |
end in |

547 |
let ty = type_coretype type_dim vdecl.var_dec_type.ty_dec_desc in |

548 |
let ty_status = |

549 |
if vdecl.var_dec_const |

550 |
then Type_predef.type_static (Dimension.mkdim_var ()) ty |

551 |
else ty in |

552 |
let new_env = Env.add_value env vdecl.var_id ty_status in |

553 |
type_coreclock (new_env,vd_env) vdecl.var_dec_clock vdecl.var_id vdecl.var_loc; |

554 |
vdecl.var_type <- ty_status; |

555 |
new_env |

556 | |

557 |
let type_var_decl_list vd_env env l = |

558 |
List.fold_left (type_var_decl vd_env) env l |

559 | |

560 |
let type_of_vlist vars = |

561 |
let tyl = List.map (fun v -> v.var_type) vars in |

562 |
type_of_type_list tyl |

563 | |

564 |
let add_vdecl vd_env vdecl = |

565 |
if List.exists (fun v -> v.var_id = vdecl.var_id) vd_env |

566 |
then raise (Error (vdecl.var_loc, Already_bound vdecl.var_id)) |

567 |
else vdecl::vd_env |

568 | |

569 |
let check_vd_env vd_env = |

570 |
ignore (List.fold_left add_vdecl [] vd_env) |

571 | |

572 |
(** [type_node env nd loc] types node [nd] in environment env. The |

573 |
location is used for error reports. *) |

574 |
let type_node env nd loc = |

575 |
let is_main = nd.node_id = !Options.main_node in |

576 |
let vd_env_ol = nd.node_outputs@nd.node_locals in |

577 |
let vd_env = nd.node_inputs@vd_env_ol in |

578 |
check_vd_env vd_env; |

579 |
let init_env = env in |

580 |
let delta_env = type_var_decl_list vd_env init_env nd.node_inputs in |

581 |
let delta_env = type_var_decl_list vd_env delta_env nd.node_outputs in |

582 |
let delta_env = type_var_decl_list vd_env delta_env nd.node_locals in |

583 |
let new_env = Env.overwrite env delta_env in |

584 |
let undefined_vars_init = |

585 |
List.fold_left |

586 |
(fun uvs v -> IMap.add v.var_id () uvs) |

587 |
IMap.empty vd_env_ol in |

588 |
let undefined_vars = |

589 |
List.fold_left (type_eq (new_env, vd_env) is_main) undefined_vars_init nd.node_eqs |

590 |
in |

591 |
(* check that table is empty *) |

592 |
if (not (IMap.is_empty undefined_vars)) then |

593 |
raise (Error (loc, Undefined_var undefined_vars)); |

594 |
let ty_ins = type_of_vlist nd.node_inputs in |

595 |
let ty_outs = type_of_vlist nd.node_outputs in |

596 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |

597 |
generalize ty_node; |

598 |
(* TODO ? Check that no node in the hierarchy remains polymorphic ? *) |

599 |
nd.node_type <- ty_node; |

600 |
Env.add_value env nd.node_id ty_node |

601 | |

602 |
let type_imported_node env nd loc = |

603 |
let new_env = type_var_decl_list nd.nodei_inputs env nd.nodei_inputs in |

604 |
let vd_env = nd.nodei_inputs@nd.nodei_outputs in |

605 |
check_vd_env vd_env; |

606 |
ignore(type_var_decl_list vd_env new_env nd.nodei_outputs); |

607 |
let ty_ins = type_of_vlist nd.nodei_inputs in |

608 |
let ty_outs = type_of_vlist nd.nodei_outputs in |

609 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |

610 |
generalize ty_node; |

611 |
(* |

612 |
if (is_polymorphic ty_node) then |

613 |
raise (Error (loc, Poly_imported_node nd.nodei_id)); |

614 |
*) |

615 |
let new_env = Env.add_value env nd.nodei_id ty_node in |

616 |
nd.nodei_type <- ty_node; |

617 |
new_env |

618 | |

619 |
let type_imported_fun env nd loc = |

620 |
let new_env = type_var_decl_list nd.fun_inputs env nd.fun_inputs in |

621 |
let vd_env = nd.fun_inputs@nd.fun_outputs in |

622 |
check_vd_env vd_env; |

623 |
ignore(type_var_decl_list vd_env new_env nd.fun_outputs); |

624 |
let ty_ins = type_of_vlist nd.fun_inputs in |

625 |
let ty_outs = type_of_vlist nd.fun_outputs in |

626 |
let ty_node = new_ty (Tarrow (ty_ins,ty_outs)) in |

627 |
generalize ty_node; |

628 |
(* |

629 |
if (is_polymorphic ty_node) then |

630 |
raise (Error (loc, Poly_imported_node nd.fun_id)); |

631 |
*) |

632 |
let new_env = Env.add_value env nd.fun_id ty_node in |

633 |
nd.fun_type <- ty_node; |

634 |
new_env |

635 | |

636 |
let type_top_consts env clist = |

637 |
List.fold_left (fun env cdecl -> |

638 |
let ty = type_const cdecl.const_loc cdecl.const_value in |

639 |
let d = |

640 |
if is_dimension_type ty |

641 |
then dimension_of_const cdecl.const_loc cdecl.const_value |

642 |
else Dimension.mkdim_var () in |

643 |
let ty = Type_predef.type_static d ty in |

644 |
let new_env = Env.add_value env cdecl.const_id ty in |

645 |
cdecl.const_type <- ty; |

646 |
new_env) env clist |

647 | |

648 |
let type_top_decl env decl = |

649 |
match decl.top_decl_desc with |

650 |
| Node nd -> ( |

651 |
try |

652 |
type_node env nd decl.top_decl_loc |

653 |
with Error (loc, err) as exc -> ( |

654 |
if !Options.global_inline then |

655 |
Format.eprintf "Type error: failing node@.%a@.@?" |

656 |
Printers.pp_node nd |

657 |
; |

658 |
raise exc) |

659 |
) |

660 |
| ImportedNode nd -> |

661 |
type_imported_node env nd decl.top_decl_loc |

662 |
| ImportedFun nd -> |

663 |
type_imported_fun env nd decl.top_decl_loc |

664 |
| Consts clist -> |

665 |
type_top_consts env clist |

666 |
| Open _ -> env |

667 | |

668 |
let type_prog env decls = |

669 |
try |

670 |
List.fold_left type_top_decl env decls |

671 |
with Failure _ as exc -> raise exc |

672 | |

673 |
(* Once the Lustre program is fully typed, |

674 |
we must get back to the original description of dimensions, |

675 |
with constant parameters, instead of unifiable internal variables. *) |

676 | |

677 |
(* The following functions aims at 'unevaluating' dimension expressions occuring in array types, |

678 |
i.e. replacing unifiable second_order variables with the original static parameters. |

679 |
Once restored in this formulation, dimensions may be meaningfully printed. |

680 |
*) |

681 |
(* |

682 |
let uneval_vdecl_generics vdecl ty = |

683 |
if vdecl.var_dec_const |

684 |
then |

685 |
match get_static_value ty with |

686 |
| None -> (Format.eprintf "internal error: %a@." Types.print_ty vdecl.var_type; assert false) |

687 |
| Some d -> Dimension.unify d (Dimension.mkdim_ident vdecl.var_loc vdecl.var_id) |

688 | |

689 |
let uneval_node_generics vdecls = |

690 |
let inst_typ_vars = ref [] in |

691 |
let inst_dim_vars = ref [] in |

692 |
let inst_ty_list = List.map (fun v -> instantiate inst_typ_vars inst_dim_vars v.var_type) vdecls in |

693 |
List.iter2 (fun v ty -> uneval_vdecl_generics v ty) vdecls inst_ty_list; |

694 |
List.iter2 (fun v ty -> generalize ty; v.var_type <- ty) vdecls inst_ty_list |

695 |
*) |

696 |
let uneval_vdecl_generics vdecl = |

697 |
if vdecl.var_dec_const |

698 |
then |

699 |
match get_static_value vdecl.var_type with |

700 |
| None -> (Format.eprintf "internal error: %a@." Types.print_ty vdecl.var_type; assert false) |

701 |
| Some d -> Dimension.uneval vdecl.var_id d |

702 | |

703 |
let uneval_node_generics vdecls = |

704 |
List.iter uneval_vdecl_generics vdecls |

705 | |

706 |
let uneval_top_generics decl = |

707 |
match decl.top_decl_desc with |

708 |
| Node nd -> |

709 |
uneval_node_generics (nd.node_inputs @ nd.node_outputs) |

710 |
| ImportedNode nd -> |

711 |
uneval_node_generics (nd.nodei_inputs @ nd.nodei_outputs) |

712 |
| ImportedFun nd -> |

713 |
() |

714 |
| Consts clist -> () |

715 |
| Open _ -> () |

716 | |

717 |
let uneval_prog_generics prog = |

718 |
List.iter uneval_top_generics prog |

719 | |

720 |
let check_env_compat header declared computed = |

721 |
(try |

722 |
uneval_prog_generics header |

723 |
with e -> raise e); |

724 |
Env.iter declared (fun k decl_type_k -> |

725 |
let computed_t = instantiate (ref []) (ref []) (Env.lookup_value computed k) in |

726 |
(*Types.print_ty Format.std_formatter decl_type_k; |

727 |
Types.print_ty Format.std_formatter computed_t;*) |

728 |
try_semi_unify decl_type_k computed_t Location.dummy_loc |

729 |
) |

730 | |

731 |
(* Local Variables: *) |

732 |
(* compile-command:"make -C .." *) |

733 |
(* End: *) |