Commit | Line | Data |
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523e2b06 SK |
1 | module List = ListLabels |
2 | ||
155ee327 | 3 | module A = Tiger_absyn |
e6e82c08 | 4 | module Dag = Tiger_dag |
155ee327 SK |
5 | module Env = Tiger_env |
6 | module E = Tiger_error | |
21d0f050 | 7 | module Escape = Tiger_semant_escape |
e6e82c08 SK |
8 | module Pos = Tiger_position |
9 | module Sym = Tiger_symbol | |
cc540a7e | 10 | module Temp = Tiger_temp |
155ee327 SK |
11 | module Translate = Tiger_translate |
12 | module Type = Tiger_env_type | |
13 | module Value = Tiger_env_value | |
14 | ||
15 | (* The only reason for having this seemingly-superfluous inner module is to | |
16 | * have this nice signature as a summary of what each function does. *) | |
17 | module Semant : sig | |
18 | type expty = | |
19 | { exp : Translate.exp | |
20 | ; ty : Type.t | |
21 | } | |
22 | ||
23 | (* Violating normal naming convention just to make it easier to follow | |
24 | * Appel's | |
25 | *) | |
26 | val transExp : env:Env.t -> A.exp -> expty | |
862e5c05 SK |
27 | |
28 | (* transVar does not seem to be needed, as trvar handles all our cases. | |
29 | * Am I wrong? | |
30 | * | |
31 | * val transVar : env:Env.t -> A.var -> expty | |
32 | * | |
33 | *) | |
155ee327 SK |
34 | end = struct |
35 | type expty = | |
36 | { exp : Translate.exp | |
37 | ; ty : Type.t | |
38 | } | |
39 | ||
cbb4ffb6 SK |
40 | let rec actual_ty ty ~pos = |
41 | match ty with | |
42 | | Type.Name (name, ty_opt_ref) -> | |
43 | (match !ty_opt_ref with | |
44 | | None -> | |
45 | E.raise (E.Unknown_type {ty_id=name; pos}) | |
46 | | Some ty -> | |
47 | actual_ty ty ~pos | |
48 | ) | |
49 | | Type.Unit | |
50 | | Type.Nil | |
51 | | Type.Int | |
52 | | Type.String | |
53 | | Type.Record _ | |
54 | | Type.Array _ -> | |
55 | ty | |
56 | ||
6ca1afb7 | 57 | let return ty = {exp = Translate.dummy__FIXME; ty} |
523e2b06 SK |
58 | let return_unit = return Type.Unit |
59 | let return_nil = return Type.Nil | |
60 | let return_int = return Type.Int | |
61 | let return_string = return Type.String | |
155ee327 | 62 | |
523e2b06 SK |
63 | let env_get_typ ~sym ~env ~pos : Type.t = |
64 | match Env.get_typ env sym with | |
65 | | Some ty -> ty | |
66 | | None -> E.raise (E.Unknown_type {ty_id=sym; pos}) | |
67 | ||
cbb4ffb6 SK |
68 | let env_get_typ_actual ~sym ~env ~pos : Type.t = |
69 | actual_ty (env_get_typ ~sym ~env ~pos) ~pos | |
70 | ||
523e2b06 SK |
71 | let env_get_val ~sym ~env ~pos : Value.t = |
72 | match Env.get_val env sym with | |
73 | | Some ty -> ty | |
74 | | None -> E.raise (E.Unknown_id {id=sym; pos}) | |
75 | ||
76 | let check_same {exp=_; ty=ty_left} {exp=_; ty=ty_right} ~pos : unit = | |
77 | if Type.is_equal ty_left ty_right then | |
78 | () | |
79 | else | |
80 | E.raise (E.Wrong_type {expected=ty_left; given=ty_right; pos}) | |
81 | ||
82 | let check_int expty ~pos : unit = | |
cbb4ffb6 | 83 | check_same return_int expty ~pos |
978cb41c | 84 | |
e6e82c08 SK |
85 | let paths_of_typedecs typedecs : (Sym.t * Sym.t * Pos.t) list list = |
86 | let (path, paths) = | |
87 | List.fold_left typedecs ~init:([], []) ~f:( | |
88 | fun (path, paths) (A.TypeDec {name=child; ty; pos}) -> | |
89 | match ty with | |
90 | | A.NameTy {symbol=parent; _} -> | |
91 | (((parent, child, pos) :: path), paths) | |
92 | | A.RecordTy _ | |
93 | | A.ArrayTy _ -> | |
94 | ([], path :: paths) | |
95 | ) | |
96 | in | |
97 | List.map (path :: paths) ~f:List.rev | |
98 | ||
99 | let check_cycles (typedecs : A.typedec list) : unit = | |
100 | let non_empty_paths = | |
101 | List.filter | |
102 | (paths_of_typedecs typedecs) | |
103 | ~f:(function [] -> false | _ -> true) | |
104 | in | |
105 | List.iter non_empty_paths ~f:( | |
106 | fun path -> | |
107 | match Dag.of_list (List.map path ~f:(fun (p, c, _) -> (p, c))) with | |
108 | | Ok _ -> | |
109 | () | |
110 | | Error `Cycle -> | |
111 | let (_, from_id, from_pos) = List.hd path in | |
112 | let (_, to_id, to_pos) = List.hd (List.rev path) in | |
113 | E.raise (E.Cycle_in_type_decs {from_id; from_pos; to_id; to_pos}) | |
114 | ) | |
115 | ||
523e2b06 SK |
116 | let rec transExp ~env exp = |
117 | let rec trexp exp = | |
118 | (match exp with | |
119 | | A.NilExp -> | |
120 | return_nil | |
121 | | A.IntExp _ -> | |
122 | return_int | |
123 | | A.StringExp {string=_; _} -> | |
124 | return_string | |
978cb41c SK |
125 | | A.CallExp {func; args; pos} -> |
126 | (match env_get_val ~sym:func ~env ~pos with | |
cc540a7e | 127 | | Value.Fun {formals; result; level=_; label=_} -> |
54e838f4 SK |
128 | let expected = List.length formals in |
129 | let given = List.length args in | |
130 | if given = expected then | |
131 | begin | |
132 | List.iter2 formals args ~f:(fun ty_expected exp_given -> | |
133 | check_same | |
134 | (return (actual_ty ~pos ty_expected)) | |
135 | (trexp exp_given) | |
136 | ~pos; | |
137 | ); | |
138 | return (actual_ty ~pos result) | |
139 | end | |
140 | else | |
141 | E.raise (E.Wrong_number_of_args {func; expected; given; pos}) | |
978cb41c SK |
142 | | Value.Var _ -> |
143 | E.raise (E.Id_not_a_function {id=func; pos}) | |
144 | ) | |
523e2b06 SK |
145 | | A.OpExp {oper; left; right; pos} -> |
146 | trop oper ~left ~right ~pos | |
0ed7a07c | 147 | | A.RecordExp {fields=field_exps; typ; pos} -> |
cbb4ffb6 | 148 | let ty = env_get_typ_actual ~sym:typ ~env ~pos in |
0ed7a07c SK |
149 | Type.if_record |
150 | ty | |
151 | ~f:(fun field_tys -> | |
152 | List.iter field_exps ~f:(fun (field, exp, pos) -> | |
153 | (match List.assoc_opt field field_tys with | |
154 | | Some field_ty -> | |
cbb4ffb6 | 155 | check_same (return (actual_ty ~pos field_ty)) (trexp exp) ~pos |
0ed7a07c SK |
156 | | None -> |
157 | E.raise | |
158 | (E.No_such_field_in_record {field; record=ty; pos}) | |
159 | ) | |
160 | ) | |
161 | ) | |
162 | ~otherwise:(fun () -> | |
163 | E.raise (E.Wrong_type_used_as_record {ty_id=typ; ty; pos}) | |
164 | ); | |
cbb4ffb6 | 165 | return (actual_ty ~pos ty) |
9d8471b2 | 166 | | A.SeqExp [] -> |
523e2b06 | 167 | return_unit |
9d8471b2 SK |
168 | | A.SeqExp exps -> |
169 | let last xs = | |
170 | xs | |
171 | |> List.rev (* Yes, redundant, but clean-looking ;-P *) | |
172 | |> List.hd (* Empty is matched in above SeqExp match case *) | |
173 | in | |
174 | exps | |
cbb4ffb6 | 175 | |> List.map ~f:(fun (exp, _) -> trexp exp) |
9d8471b2 | 176 | |> last |
523e2b06 SK |
177 | | A.AssignExp {var; exp; pos} -> |
178 | check_same (trvar var) (trexp exp) ~pos; | |
179 | (* TODO: Add var->exp to val env? *) | |
180 | return_unit | |
181 | | A.IfExp {test; then'; else'; pos} -> | |
182 | (* test : must be int, because we have no bool *) | |
183 | (* then : must equal else *) | |
184 | (* else : must equal then or be None *) | |
185 | check_int (trexp test) ~pos; | |
186 | (match (trexp then', else') with | |
187 | | expty_then, None -> | |
188 | expty_then | |
189 | | expty_then, Some else' -> | |
190 | let expty_else = trexp else' in | |
191 | check_same expty_then expty_else ~pos; | |
192 | expty_then | |
193 | ) | |
194 | | A.WhileExp {test; body; pos} -> | |
195 | (* test : must be int, because we have no bool *) | |
196 | check_int (trexp test) ~pos; | |
35dccbd3 SK |
197 | let (loop, env) = Env.loop_begin env in |
198 | (* Only care if an error is raised *) | |
199 | ignore (transExp ~env body); | |
200 | ignore (Env.loop_end env loop); | |
523e2b06 SK |
201 | return_unit |
202 | | A.ForExp {var; lo; hi; body; pos; escape=_} -> | |
203 | check_int (trexp lo) ~pos; | |
204 | check_int (trexp hi) ~pos; | |
35dccbd3 | 205 | let (loop, env) = Env.loop_begin env in |
cc540a7e SK |
206 | let level = Env.level_get env in |
207 | (* Assuming all escape, for now *) | |
208 | let access = Translate.alloc_local ~level ~escapes:true in | |
209 | let env = Env.set_val env var (Value.Var {ty = Type.Int; access}) in | |
35dccbd3 | 210 | (* Only care if an error is raised *) |
85e08b69 | 211 | ignore (transExp ~env body); |
35dccbd3 | 212 | ignore (Env.loop_end env loop); |
523e2b06 | 213 | return_unit |
35dccbd3 SK |
214 | | A.BreakExp pos -> |
215 | (match Env.loop_current env with | |
216 | | Some _ -> () | |
217 | | None -> E.raise (E.Break_outside_loop pos) | |
218 | ); | |
523e2b06 | 219 | return_unit |
8744eb3a SK |
220 | | A.LetExp {decs; body; pos=_} -> |
221 | (* (1) decs augment env *) | |
222 | (* (2) body checked against the new env *) | |
223 | let env = | |
224 | List.fold_left decs ~init:env ~f:(fun env dec -> transDec dec ~env) | |
225 | in | |
226 | transExp body ~env | |
4c550cd5 SK |
227 | | A.ArrayExp {typ; size; init; pos} -> |
228 | check_int (trexp size) ~pos; | |
cbb4ffb6 | 229 | let ty = env_get_typ_actual ~sym:typ ~env ~pos in |
4c550cd5 SK |
230 | Type.if_array |
231 | ty | |
232 | ~f:(fun ty_elements -> | |
cbb4ffb6 | 233 | check_same (return (actual_ty ~pos ty_elements)) (trexp init) ~pos |
4c550cd5 SK |
234 | ) |
235 | ~otherwise:(fun () -> | |
236 | E.raise (E.Wrong_type_used_as_array {ty_id=typ; ty; pos}) | |
237 | ); | |
cbb4ffb6 | 238 | return (actual_ty ~pos ty) |
523e2b06 SK |
239 | | A.VarExp var -> |
240 | trvar var | |
241 | ) | |
242 | and trvar = | |
243 | (function | |
244 | | A.SimpleVar {symbol=sym; pos} -> | |
245 | (match env_get_val ~sym ~env ~pos with | |
cc540a7e SK |
246 | | Value.Fun _ -> |
247 | E.raise (E.Id_is_a_function {id=sym; pos}) | |
248 | | Value.Var {ty; access=_} -> | |
249 | return (actual_ty ~pos ty) | |
523e2b06 SK |
250 | ) |
251 | | A.FieldVar {var; symbol; pos} -> | |
252 | let {exp=_; ty} = trvar var in | |
253 | Type.if_record | |
254 | ty | |
255 | ~f:(fun fields -> | |
256 | (match List.assoc_opt symbol fields with | |
257 | | None -> | |
258 | E.raise | |
259 | (E.No_such_field_in_record {field=symbol; record=ty; pos}) | |
260 | | Some ty -> | |
cbb4ffb6 | 261 | return (actual_ty ~pos ty) |
523e2b06 SK |
262 | ) |
263 | ) | |
264 | ~otherwise:(fun () -> E.raise (E.Exp_not_a_record {ty; pos})) | |
161a300d SK |
265 | | A.SubscriptVar {var; exp; pos} -> |
266 | let {exp=_; ty} = trvar var in | |
267 | check_int (trexp exp) ~pos; | |
268 | Type.if_array | |
269 | ty | |
cbb4ffb6 | 270 | ~f:(fun ty_elements -> return (actual_ty ~pos ty_elements)) |
161a300d | 271 | ~otherwise:(fun () -> E.raise (E.Exp_not_an_array {ty; pos})) |
523e2b06 SK |
272 | ) |
273 | and trop oper ~left ~right ~pos = | |
cbb4ffb6 | 274 | (* TODO: Refactor trop - all opers return bool/int *) |
523e2b06 SK |
275 | let expty_left = trexp left in |
276 | let expty_right = trexp right in | |
277 | check_same expty_left expty_right ~pos; | |
278 | let {exp=_; ty} = expty_left in | |
279 | let module T = Type in | |
280 | (match oper with | |
281 | (* Arithmetic: int *) | |
282 | | A.PlusOp | |
283 | | A.MinusOp | |
284 | | A.TimesOp | |
285 | | A.DivideOp -> | |
286 | check_int expty_left ~pos; | |
287 | return_int | |
288 | (* Equality: int, string, array, record *) | |
289 | | A.EqOp | |
290 | | A.NeqOp -> | |
291 | if (T.is_int ty) | |
292 | || (T.is_string ty) | |
293 | || (T.is_array ty) | |
294 | || (T.is_record ty) | |
295 | then | |
cbb4ffb6 | 296 | return_int (* Because we have no bool type *) |
523e2b06 SK |
297 | else |
298 | E.raise (E.Invalid_operand_type | |
299 | { oper | |
300 | ; valid = ["int"; "string"; "array"; "record"] | |
301 | ; given = ty | |
302 | ; pos | |
303 | }) | |
304 | (* Order: int, string *) | |
305 | | A.LtOp | |
306 | | A.LeOp | |
307 | | A.GtOp | |
308 | | A.GeOp -> | |
309 | if (T.is_int ty) | |
310 | || (T.is_string ty) | |
311 | then | |
cbb4ffb6 | 312 | return_int (* Because we have no bool type *) |
523e2b06 SK |
313 | else |
314 | E.raise (E.Invalid_operand_type | |
315 | { oper | |
316 | ; valid = ["int"; "string"] | |
317 | ; given = ty | |
318 | ; pos | |
319 | }) | |
320 | ) | |
321 | in | |
322 | trexp exp | |
862e5c05 | 323 | and transDec ~(env : Env.t) (dec : A.dec) : Env.t = |
8744eb3a SK |
324 | (match dec with |
325 | | A.VarDec {name; typ=typ_opt; init; pos=pos_outter; escape=_} -> | |
326 | let ty = | |
327 | (match (typ_opt, transExp ~env init) with | |
6ca1afb7 | 328 | | None, {ty; exp=_} -> |
8744eb3a SK |
329 | ty |
330 | | Some (sym, pos_inner), expty_init -> | |
cbb4ffb6 SK |
331 | let ty = env_get_typ_actual ~sym ~env ~pos:pos_inner in |
332 | check_same (return ty) expty_init ~pos:pos_outter; | |
8744eb3a SK |
333 | ty |
334 | ) | |
335 | in | |
cc540a7e SK |
336 | let access = |
337 | Translate.alloc_local | |
338 | ~level:(Env.level_get env) | |
339 | ~escapes:true (* Assuming all escape, for now... *) | |
340 | in | |
341 | Env.set_val env name (Value.Var {ty; access}) | |
0324a942 | 342 | | A.TypeDecs typedecs -> |
e6e82c08 | 343 | check_cycles typedecs; |
cbb4ffb6 SK |
344 | let env = |
345 | List.fold_left typedecs ~init:env ~f:( | |
346 | fun env (A.TypeDec {name; ty=_; pos=_}) -> | |
347 | Env.set_typ env name (Type.Name (name, ref None)) | |
348 | ) | |
349 | in | |
a131e30c SK |
350 | List.iter typedecs ~f:(fun (A.TypeDec {name=ty_name; ty=ty_exp; pos}) -> |
351 | let ty = transTy ~env ~ty_name ~ty_exp in | |
352 | (match env_get_typ ~sym:ty_name ~env ~pos with | |
9340b0e3 | 353 | | Type.Name (_, ty_opt_ref) -> |
cbb4ffb6 SK |
354 | ty_opt_ref := Some ty |
355 | | Type.Unit | |
356 | | Type.Nil | |
357 | | Type.Int | |
358 | | Type.String | |
359 | | Type.Record _ | |
360 | | Type.Array _ -> | |
361 | () | |
362 | ) | |
363 | ); | |
364 | env | |
76c771a7 | 365 | | A.FunDecs fundecs -> |
a284f5c2 SK |
366 | let env_with_fun_heads_only = |
367 | List.fold_left fundecs ~init:env ~f:( | |
368 | fun env (A.FunDec {name; params; result; body=_; pos=_}) -> | |
369 | let formals = | |
370 | List.map params ~f:( | |
371 | fun (A.Field {name=_; typ; pos; escape=_}) -> | |
372 | env_get_typ_actual ~env ~sym:typ ~pos | |
373 | ) | |
374 | in | |
375 | let result = | |
376 | match result with | |
377 | | Some (s, p) -> env_get_typ_actual ~sym:s ~env ~pos:p | |
378 | | None -> Type.Unit | |
379 | in | |
cc540a7e SK |
380 | let label = Temp.Label.gen () in |
381 | let level = | |
382 | Translate.Level.next | |
383 | (Env.level_get env) | |
384 | ~name:label | |
385 | (* Assuming all escape (for now) *) | |
386 | ~formals:(List.map formals ~f:(fun _ -> true)) | |
387 | in | |
388 | let env = Env.level_set env level in | |
389 | Env.set_val env name (Value.Fun {formals; result; level; label}) | |
a284f5c2 SK |
390 | ) |
391 | in | |
392 | List.iter fundecs ~f:( | |
393 | fun (A.FunDec {name=_; params; result=_; body; pos=_}) -> | |
394 | let env_with_fun_heads_and_local_vars = | |
395 | List.fold_left params ~init:env_with_fun_heads_only ~f:( | |
396 | fun env (A.Field {name=var_name; escape=_; typ; pos}) -> | |
397 | let var_ty = env_get_typ_actual ~env ~sym:typ ~pos in | |
cc540a7e SK |
398 | let level = Env.level_get env in |
399 | (* Assuming all escape, for now *) | |
400 | let access = Translate.alloc_local ~level ~escapes:true in | |
401 | Env.set_val | |
402 | env | |
403 | var_name | |
404 | (Value.Var {ty = var_ty; access}) | |
76c771a7 SK |
405 | ) |
406 | in | |
a284f5c2 SK |
407 | (* we only care if an exception is raised *) |
408 | ignore (transExp ~env:env_with_fun_heads_and_local_vars body); | |
409 | ); | |
410 | env_with_fun_heads_only | |
8744eb3a | 411 | ) |
a131e30c | 412 | and transTy ~(env : Env.t) ~ty_name ~(ty_exp : A.ty) : Type.t = |
cbb4ffb6 | 413 | (match ty_exp with |
0324a942 SK |
414 | | A.NameTy {symbol=sym; pos} -> |
415 | env_get_typ ~sym ~env ~pos | |
416 | | A.RecordTy fields -> | |
417 | let fields = | |
418 | List.map fields ~f:(fun (A.Field {name; escape=_; typ; pos}) -> | |
419 | let ty = env_get_typ ~sym:typ ~env ~pos in | |
420 | (name, ty) | |
421 | ) | |
422 | in | |
a131e30c | 423 | Type.new_record ~name:ty_name ~fields |
0324a942 SK |
424 | | A.ArrayTy {symbol=sym; pos} -> |
425 | let element_ty = env_get_typ ~sym ~env ~pos in | |
a131e30c | 426 | Type.new_array ~name:ty_name ~ty:element_ty |
0324a942 | 427 | ) |
155ee327 SK |
428 | end |
429 | ||
8744eb3a SK |
430 | open Semant |
431 | ||
155ee327 | 432 | let transProg absyn = |
cc540a7e | 433 | Escape.find ~prog:absyn; |
155ee327 SK |
434 | let {exp = _; ty = _} = transExp absyn ~env:Env.base in |
435 | () |