## lustrec / src / types.ml @ a1daa793

History | View | Annotate | Download (10.1 KB)

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

2 |
(* *) |

3 |
(* The LustreC compiler toolset / The LustreC Development Team *) |

4 |
(* Copyright 2012 - -- ONERA - CNRS - INPT - LIFL *) |

5 |
(* *) |

6 |
(* LustreC is free software, distributed WITHOUT ANY WARRANTY *) |

7 |
(* under the terms of the GNU Lesser General Public License *) |

8 |
(* version 2.1. *) |

9 |
(* *) |

10 |
(* This file was originally from the Prelude compiler *) |

11 |
(* *) |

12 |
(********************************************************************) |

13 | |

14 |
(** Types definitions and a few utility functions on types. *) |

15 |
open Utils |

16 |
open Dimension |

17 | |

18 |
type type_expr = |

19 |
{mutable tdesc: type_desc; |

20 |
tid: int} |

21 | |

22 |
and type_desc = |

23 |
| Tconst of ident (* type constant *) |

24 |
| Tint |

25 |
| Treal |

26 |
| Tbool |

27 |
| Trat (* Actually unused for now. Only place where it can appear is |

28 |
in a clock declaration *) |

29 |
| Tclock of type_expr (* A type expression explicitely tagged as carrying a clock *) |

30 |
| Tarrow of type_expr * type_expr |

31 |
| Ttuple of type_expr list |

32 |
| Tenum of ident list |

33 |
| Tstruct of (ident * type_expr) list |

34 |
| Tarray of dim_expr * type_expr |

35 |
| Tstatic of dim_expr * type_expr (* a type carried by a dimension expression *) |

36 |
| Tlink of type_expr (* During unification, make links instead of substitutions *) |

37 |
| Tvar (* Monomorphic type variable *) |

38 |
| Tunivar (* Polymorphic type variable *) |

39 | |

40 |
type error = |

41 |
Unbound_value of ident |

42 |
| Already_bound of ident |

43 |
| Already_defined of ident |

44 |
| Undefined_var of ISet.t |

45 |
| Declared_but_undefined of ident |

46 |
| Unbound_type of ident |

47 |
| Not_a_dimension |

48 |
| Not_a_constant |

49 |
| Assigned_constant of ident |

50 |
| WrongArity of int * int |

51 |
| WrongMorphism of int * int |

52 |
| Type_mismatch of ident |

53 |
| Type_clash of type_expr * type_expr |

54 |
| Poly_imported_node of ident |

55 | |

56 |
exception Unify of type_expr * type_expr |

57 |
exception Error of Location.t * error |

58 | |

59 |
(* Pretty-print*) |

60 |
open Format |

61 | |

62 |
let rec print_struct_ty_field fmt (label, ty) = |

63 |
fprintf fmt "%a : %a" pp_print_string label print_ty ty |

64 |
and print_ty fmt ty = |

65 |
match ty.tdesc with |

66 |
| Tvar -> |

67 |
fprintf fmt "_%s" (name_of_type ty.tid) |

68 |
| Tint -> |

69 |
fprintf fmt "int" |

70 |
| Treal -> |

71 |
fprintf fmt "real" |

72 |
| Tbool -> |

73 |
fprintf fmt "bool" |

74 |
| Tclock t -> |

75 |
fprintf fmt "%a clock" print_ty t |

76 |
| Tstatic (d, t) -> |

77 |
fprintf fmt "(%a:%a)" Dimension.pp_dimension d print_ty t |

78 |
| Tconst t -> |

79 |
fprintf fmt "%s" t |

80 |
| Trat -> |

81 |
fprintf fmt "rat" |

82 |
| Tarrow (ty1,ty2) -> |

83 |
fprintf fmt "%a -> %a" print_ty ty1 print_ty ty2 |

84 |
| Ttuple tylist -> |

85 |
fprintf fmt "(%a)" |

86 |
(Utils.fprintf_list ~sep:" * " print_ty) tylist |

87 |
| Tenum taglist -> |

88 |
fprintf fmt "enum {%a }" |

89 |
(Utils.fprintf_list ~sep:", " pp_print_string) taglist |

90 |
| Tstruct fieldlist -> |

91 |
fprintf fmt "struct {%a }" |

92 |
(Utils.fprintf_list ~sep:"; " print_struct_ty_field) fieldlist |

93 |
| Tarray (e, ty) -> |

94 |
fprintf fmt "%a^%a" print_ty ty Dimension.pp_dimension e |

95 |
| Tlink ty -> |

96 |
print_ty fmt ty |

97 |
| Tunivar -> |

98 |
fprintf fmt "'%s" (name_of_type ty.tid) |

99 | |

100 |
let rec print_node_struct_ty_field fmt (label, ty) = |

101 |
fprintf fmt "%a : %a" pp_print_string label print_node_ty ty |

102 |
and print_node_ty fmt ty = |

103 |
match ty.tdesc with |

104 |
| Tvar -> begin |

105 |
(*Format.eprintf "DEBUG:Types.print_node@.";*) |

106 |
fprintf fmt "_%s" (name_of_type ty.tid) |

107 |
end |

108 |
| Tint -> |

109 |
fprintf fmt "int" |

110 |
| Treal -> |

111 |
fprintf fmt "real" |

112 |
| Tbool -> |

113 |
fprintf fmt "bool" |

114 |
| Tclock t -> |

115 |
fprintf fmt "%a clock" print_node_ty t |

116 |
| Tstatic (_, t) -> |

117 |
fprintf fmt "%a" print_node_ty t |

118 |
| Tconst t -> |

119 |
fprintf fmt "%s" t |

120 |
| Trat -> |

121 |
fprintf fmt "rat" |

122 |
| Tarrow (ty1,ty2) -> |

123 |
fprintf fmt "%a -> %a" print_node_ty ty1 print_node_ty ty2 |

124 |
| Ttuple tylist -> |

125 |
fprintf fmt "(%a)" |

126 |
(Utils.fprintf_list ~sep:"*" print_node_ty) tylist |

127 |
| Tenum taglist -> |

128 |
fprintf fmt "enum {%a }" |

129 |
(Utils.fprintf_list ~sep:", " pp_print_string) taglist |

130 |
| Tstruct fieldlist -> |

131 |
fprintf fmt "struct {%a }" |

132 |
(Utils.fprintf_list ~sep:"; " print_node_struct_ty_field) fieldlist |

133 |
| Tarray (e, ty) -> |

134 |
fprintf fmt "%a^%a" print_node_ty ty Dimension.pp_dimension e |

135 |
| Tlink ty -> |

136 |
print_node_ty fmt ty |

137 |
| Tunivar -> |

138 |
fprintf fmt "'%s" (name_of_type ty.tid) |

139 | |

140 |
let pp_error fmt = function |

141 |
| Unbound_value id -> |

142 |
fprintf fmt "Unknown value %s@." id |

143 |
| Unbound_type id -> |

144 |
fprintf fmt "Unknown type %s@." id |

145 |
| Already_bound id -> |

146 |
fprintf fmt "%s is already declared@." id |

147 |
| Already_defined id -> |

148 |
fprintf fmt "Multiple definitions of variable %s@." id |

149 |
| Not_a_constant -> |

150 |
fprintf fmt "This expression is not a constant@." |

151 |
| Assigned_constant id -> |

152 |
fprintf fmt "The constant %s cannot be assigned@." id |

153 |
| Not_a_dimension -> |

154 |
fprintf fmt "This expression is not a valid dimension@." |

155 |
| WrongArity (ar1, ar2) -> |

156 |
fprintf fmt "Expecting %d argument(s), found %d@." ar1 ar2 |

157 |
| WrongMorphism (ar1, ar2) -> |

158 |
fprintf fmt "Expecting %d argument(s) for homomorphic extension, found %d@." ar1 ar2 |

159 |
| Type_mismatch id -> |

160 |
fprintf fmt "Definition and declaration of type %s don't agree@." id |

161 |
| Undefined_var vset -> |

162 |
fprintf fmt "No definition provided for variable(s): %a@." |

163 |
(Utils.fprintf_list ~sep:"," pp_print_string) |

164 |
(ISet.elements vset) |

165 |
| Declared_but_undefined id -> |

166 |
fprintf fmt "%s is declared but not defined@." id |

167 |
| Type_clash (ty1,ty2) -> |

168 |
Utils.reset_names (); |

169 |
fprintf fmt "Expected type %a, got type %a@." print_ty ty1 print_ty ty2 |

170 |
| Poly_imported_node id -> |

171 |
fprintf fmt "Imported nodes cannot have a polymorphic type@." |

172 | |

173 | |

174 |
let new_id = ref (-1) |

175 | |

176 |
let new_ty desc = |

177 |
incr new_id; {tdesc = desc; tid = !new_id } |

178 | |

179 |
let new_var () = |

180 |
new_ty Tvar |

181 | |

182 |
let new_univar () = |

183 |
new_ty Tunivar |

184 | |

185 |
let rec repr = |

186 |
function |

187 |
{tdesc = Tlink t'} -> |

188 |
repr t' |

189 |
| t -> t |

190 | |

191 |
let get_static_value ty = |

192 |
match (repr ty).tdesc with |

193 |
| Tstatic (d, _) -> Some d |

194 |
| _ -> None |

195 | |

196 |
let get_field_type ty label = |

197 |
match (repr ty).tdesc with |

198 |
| Tstruct fl -> (try Some (List.assoc label fl) with Not_found -> None) |

199 |
| _ -> None |

200 | |

201 |
let is_numeric_type ty = |

202 |
match (repr ty).tdesc with |

203 |
| Tint |

204 |
| Treal -> true |

205 |
| _ -> false |

206 | |

207 |
let is_bool_type ty = |

208 |
match (repr ty).tdesc with |

209 |
| Tbool -> true |

210 |
| _ -> false |

211 | |

212 |
let get_clock_base_type ty = |

213 |
match (repr ty).tdesc with |

214 |
| Tclock ty -> Some ty |

215 |
| _ -> None |

216 | |

217 |
let unclock_type ty = |

218 |
let ty = repr ty in |

219 |
match ty.tdesc with |

220 |
| Tclock ty' -> ty' |

221 |
| _ -> ty |

222 | |

223 |
let rec is_dimension_type ty = |

224 |
match (repr ty).tdesc with |

225 |
| Tint |

226 |
| Tbool -> true |

227 |
| Tclock ty' |

228 |
| Tstatic (_, ty') -> is_dimension_type ty' |

229 |
| _ -> false |

230 | |

231 |
let dynamic_type ty = |

232 |
let ty = repr ty in |

233 |
match ty.tdesc with |

234 |
| Tstatic (_, ty') -> ty' |

235 |
| _ -> ty |

236 | |

237 |
let is_tuple_type ty = |

238 |
match (repr ty).tdesc with |

239 |
| Ttuple _ -> true |

240 |
| _ -> false |

241 | |

242 |
let map_tuple_type f ty = |

243 |
let ty = dynamic_type ty in |

244 |
match ty.tdesc with |

245 |
| (Ttuple ty_list) -> { ty with tdesc = Ttuple (List.map f ty_list) } |

246 |
| _ -> f ty |

247 | |

248 |
let rec is_struct_type ty = |

249 |
match (repr ty).tdesc with |

250 |
| Tstruct _ -> true |

251 |
| Tstatic (_, ty') -> is_struct_type ty' |

252 |
| _ -> false |

253 | |

254 |
let struct_field_type ty field = |

255 |
match (dynamic_type ty).tdesc with |

256 |
| Tstruct fields -> |

257 |
(try |

258 |
List.assoc field fields |

259 |
with Not_found -> assert false) |

260 |
| _ -> assert false |

261 | |

262 |
let rec is_array_type ty = |

263 |
match (repr ty).tdesc with |

264 |
| Tarray _ -> true |

265 |
| Tstatic (_, ty') -> is_array_type ty' (* looks strange !? *) |

266 |
| _ -> false |

267 | |

268 |
let array_type_dimension ty = |

269 |
match (dynamic_type ty).tdesc with |

270 |
| Tarray (d, _) -> d |

271 |
| _ -> (Format.eprintf "internal error: Types.array_type_dimension %a@." print_ty ty; assert false) |

272 | |

273 |
let rec array_type_multi_dimension ty = |

274 |
match (dynamic_type ty).tdesc with |

275 |
| Tarray (d, ty') -> d :: array_type_multi_dimension ty' |

276 |
| _ -> [] |

277 | |

278 |
let array_element_type ty = |

279 |
match (dynamic_type ty).tdesc with |

280 |
| Tarray (_, ty') -> ty' |

281 |
| _ -> (Format.eprintf "internal error: Types.array_element_type %a@." print_ty ty; assert false) |

282 | |

283 |
let rec array_base_type ty = |

284 |
let ty = repr ty in |

285 |
match ty.tdesc with |

286 |
| Tarray (_, ty') |

287 |
| Tstatic (_, ty') -> array_base_type ty' |

288 |
| _ -> ty |

289 | |

290 |
let is_address_type ty = |

291 |
is_array_type ty || is_struct_type ty |

292 | |

293 |
let rec is_generic_type ty = |

294 |
match (dynamic_type ty).tdesc with |

295 |
| Tarray (d, ty') -> |

296 |
(not (Dimension.is_dimension_const d)) || (is_generic_type ty') |

297 |
| _ -> false |

298 | |

299 |
(** Splits [ty] into the [lhs,rhs] of an arrow type. Expects an arrow type |

300 |
(ensured by language syntax) *) |

301 |
let rec split_arrow ty = |

302 |
match (repr ty).tdesc with |

303 |
| Tarrow (tin,tout) -> tin,tout |

304 |
| Tstatic (_, ty') -> split_arrow ty' |

305 |
(* Functions are not first order, I don't think the var case |

306 |
needs to be considered here *) |

307 |
| _ -> Format.eprintf "type %a is not a map@.Unable to split@.@?" print_ty ty; assert false |

308 | |

309 |
(** Returns the type corresponding to a type list. *) |

310 |
let type_of_type_list tyl = |

311 |
if (List.length tyl) > 1 then |

312 |
new_ty (Ttuple tyl) |

313 |
else |

314 |
List.hd tyl |

315 | |

316 |
let type_list_of_type ty = |

317 |
match (repr ty).tdesc with |

318 |
| Ttuple tl -> tl |

319 |
| _ -> [ty] |

320 | |

321 |
(** [is_polymorphic ty] returns true if [ty] is polymorphic. *) |

322 |
let rec is_polymorphic ty = |

323 |
match ty.tdesc with |

324 |
| Tenum _ | Tvar | Tint | Treal | Tbool | Trat | Tconst _ -> false |

325 |
| Tclock ty -> is_polymorphic ty |

326 |
| Tarrow (ty1,ty2) -> (is_polymorphic ty1) || (is_polymorphic ty2) |

327 |
| Ttuple tl -> List.exists (fun t -> is_polymorphic t) tl |

328 |
| Tstruct fl -> List.exists (fun (_, t) -> is_polymorphic t) fl |

329 |
| Tlink t' -> is_polymorphic t' |

330 |
| Tarray (d, ty) |

331 |
| Tstatic (d, ty) -> Dimension.is_polymorphic d || is_polymorphic ty |

332 |
| Tunivar -> true |

333 | |

334 | |

335 |
let mktyptuple nb typ = |

336 |
let array = Array.make nb typ in |

337 |
Ttuple (Array.to_list array) |

338 | |

339 | |

340 |
(* Local Variables: *) |

341 |
(* compile-command:"make -C .." *) |

342 |
(* End: *) |