Commit | Line | Data |
---|---|---|
27d9de59 | 1 | (* HCoop Domtool (http://hcoop.sourceforge.net/) |
e1b99e23 | 2 | * Copyright (c) 2006-2007, Adam Chlipala |
27d9de59 AC |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
dac62e84 | 17 | *) |
27d9de59 AC |
18 | |
19 | (* Domtool configuration language type checking *) | |
20 | ||
21 | structure Tycheck :> TYCHECK = struct | |
22 | ||
492c1cff | 23 | open Ast Print Env |
27d9de59 AC |
24 | |
25 | structure SM = StringMap | |
26 | ||
b3159a70 AC |
27 | val externFlag = ref false |
28 | fun allowExterns () = externFlag := true | |
29 | fun disallowExterns () = externFlag := false | |
30 | ||
27d9de59 AC |
31 | local |
32 | val unifCount = ref 0 | |
33 | in | |
34 | fun resetUnif () = unifCount := 0 | |
35 | ||
36 | fun newUnif () = | |
37 | let | |
38 | val c = !unifCount | |
39 | val name = | |
40 | if c < 26 then | |
41 | str (chr (ord #"A" + c)) | |
42 | else | |
43 | "UNIF" ^ Int.toString (c - 26) | |
44 | in | |
45 | unifCount := c + 1; | |
46 | TUnif (name, ref NONE) | |
47 | end | |
48 | end | |
49 | ||
27d9de59 | 50 | |
db427c67 | 51 | fun predImplies (p1All as (p1, _), p2All as (p2, _)) = |
27d9de59 | 52 | case (p1, p2) of |
1a4e5a6c AC |
53 | (_, CAnd (p1, p2)) => predImplies (p1All, p1) andalso predImplies (p1All, p2) |
54 | | (CAnd (p1, p2), _) => predImplies (p1, p2All) orelse predImplies (p2, p2All) | |
55 | ||
56 | | (_, CPrefix (CRoot, _)) => true | |
db427c67 AC |
57 | | (CNot (CPrefix (CRoot, _), _), _) => true |
58 | ||
59 | | (CRoot, CRoot) => true | |
60 | ||
61 | | (CConst s1, CConst s2) => s1 = s2 | |
62 | ||
63 | | (CPrefix p1, CPrefix p2) => predImplies (p1, p2) | |
234b917a | 64 | | (_, CPrefix p2) => predImplies (p1All, p2) |
db427c67 AC |
65 | |
66 | | (CNot p1, CNot p2) => predImplies (p2, p1) | |
2882ee37 AC |
67 | | (CRoot, CNot (CConst _, _)) => true |
68 | | (CConst s1, CNot (CConst s2, _)) => s1 <> s2 | |
27d9de59 | 69 | |
db427c67 AC |
70 | | _ => false |
71 | ||
72 | fun predSimpl (pAll as (p, loc)) = | |
73 | case p of | |
74 | CRoot => pAll | |
75 | | CConst _ => pAll | |
76 | | CPrefix p => (CPrefix (predSimpl p), loc) | |
77 | | CNot p => (CNot (predSimpl p), loc) | |
78 | | CAnd (p1, p2) => | |
79 | let | |
80 | val p1' = predSimpl p1 | |
81 | val p2' = predSimpl p2 | |
82 | in | |
83 | case p1' of | |
84 | (CAnd (c1, c2), _) => predSimpl (CAnd (c1, (CAnd (c2, p2'), loc)), loc) | |
85 | | _ => if predImplies (p2', p1') then | |
86 | p2' | |
1a4e5a6c AC |
87 | else if predImplies (p1', p2') then |
88 | p1' | |
db427c67 AC |
89 | else |
90 | (CAnd (p1', p2'), loc) | |
91 | end | |
92 | ||
234b917a | 93 | fun subPred (p1, p2) = |
db427c67 AC |
94 | if predImplies (p1, p2) then |
95 | () | |
96 | else | |
97 | raise (Unify (UnifyPred (p1, p2))) | |
27d9de59 | 98 | |
234b917a AC |
99 | fun subRecord f (r1, r2) = |
100 | SM.appi (fn (k, v2) => | |
101 | case SM.find (r1, k) of | |
9b7ee2b2 | 102 | NONE => raise Describe.UnequalDomains |
234b917a | 103 | | SOME v1 => f (v1, v2)) r2 |
27d9de59 AC |
104 | |
105 | fun occurs u (t, _) = | |
106 | case t of | |
107 | TBase _ => false | |
108 | | TList t => occurs u t | |
109 | | TArrow (d, r) => occurs u d orelse occurs u r | |
110 | | TAction (_, d, r) => | |
111 | List.exists (occurs u) (SM.listItems d) | |
112 | orelse List.exists (occurs u) (SM.listItems r) | |
1a4e5a6c | 113 | | TNested (_, t) => occurs u t |
27d9de59 AC |
114 | | TError => false |
115 | | TUnif (_, ref (SOME t)) => occurs u t | |
116 | | TUnif (_, u') => u = u' | |
117 | ||
234b917a | 118 | fun subTyp (t1All as (t1, _), t2All as (t2, _)) = |
27d9de59 AC |
119 | case (t1, t2) of |
120 | (TBase s1, TBase s2) => | |
121 | if s1 = s2 then | |
122 | () | |
123 | else | |
124 | raise Unify (UnifyTyp (t1All, t2All)) | |
234b917a | 125 | | (TList t1, TList t2) => subTyp (t1, t2) |
27d9de59 | 126 | | (TArrow (d1, r1), TArrow (d2, r2)) => |
234b917a AC |
127 | (subTyp (d2, d1); |
128 | subTyp (r1, r2)) | |
27d9de59 AC |
129 | |
130 | | (TAction (p1, d1, r1), TAction (p2, d2, r2)) => | |
234b917a AC |
131 | ((subPred (p2, p1); |
132 | subRecord subTyp (d2, d1); | |
133 | subRecord subTyp (r1, r2); | |
134 | subRecord subTyp (r2, r1)) | |
27d9de59 AC |
135 | handle UnequalDomains => raise Unify (UnifyTyp (t1All, t2All))) |
136 | ||
234b917a AC |
137 | | (TNested (d1, r1), TNested (d2, r2)) => |
138 | (subPred (d2, d1); | |
1a4e5a6c | 139 | subTyp (r1, r2)) |
234b917a AC |
140 | |
141 | | (TUnif (_, ref (SOME t1)), _) => subTyp (t1, t2All) | |
142 | | (_, TUnif (_, ref (SOME t2))) => subTyp (t1All, t2) | |
27d9de59 AC |
143 | |
144 | | (TUnif (_, r1), TUnif (_, r2)) => | |
145 | if r1 = r2 then | |
146 | () | |
147 | else | |
148 | r1 := SOME t2All | |
149 | ||
150 | | (TUnif (name, r), _) => | |
151 | if occurs r t2All then | |
152 | raise (Unify (UnifyOccurs (name, t2All))) | |
153 | else | |
154 | r := SOME t2All | |
155 | ||
156 | | (_, TUnif (name, r)) => | |
157 | if occurs r t1All then | |
158 | raise (Unify (UnifyOccurs (name, t1All))) | |
159 | else | |
160 | r := SOME t1All | |
161 | ||
162 | | (TError, _) => () | |
163 | | (_, TError) => () | |
164 | ||
165 | | _ => raise Unify (UnifyTyp (t1All, t2All)) | |
166 | ||
167 | fun isError t = | |
168 | case t of | |
169 | (TError, _) => true | |
170 | | _ => false | |
171 | ||
db427c67 AC |
172 | fun whnorm (tAll as (t, loc)) = |
173 | case t of | |
174 | TUnif (_, ref (SOME tAll)) => whnorm tAll | |
175 | | _ => tAll | |
176 | ||
629a34f6 AC |
177 | fun baseCondition t = |
178 | case whnorm t of | |
179 | (TBase name, _) => typeRule name | |
180 | | (TList t, _) => | |
181 | (case baseCondition t of | |
182 | NONE => NONE | |
183 | | SOME f => SOME (fn (EList ls, _) => List.all f ls | |
184 | | _ => false)) | |
185 | | _ => NONE | |
186 | ||
4ecbfd4c AC |
187 | fun simplifyKindOf e = |
188 | case e of | |
189 | (EApp ((EVar s, _), e'), _) => | |
190 | (case Env.function s of | |
191 | NONE => e | |
192 | | SOME f => | |
193 | case f [e'] of | |
194 | NONE => e | |
195 | | SOME e => e) | |
196 | | _ => e | |
197 | ||
6be996d4 | 198 | fun hasTyp (e, t1, t2) = |
629a34f6 AC |
199 | if (case baseCondition t2 of |
200 | NONE => false | |
4ecbfd4c | 201 | | SOME rule => rule (simplifyKindOf e)) then |
629a34f6 AC |
202 | () |
203 | else | |
204 | subTyp (t1, t2) | |
6be996d4 | 205 | |
095de39e AC |
206 | fun checkPred G (p, loc) = |
207 | let | |
208 | val err = ErrorMsg.error (SOME loc) | |
209 | in | |
210 | case p of | |
211 | CRoot => () | |
212 | | CConst s => | |
213 | if lookupContext G s then | |
214 | () | |
215 | else | |
216 | err ("Unbound context " ^ s) | |
217 | | CPrefix p => checkPred G p | |
218 | | CNot p => checkPred G p | |
219 | | CAnd (p1, p2) => (checkPred G p1; checkPred G p2) | |
220 | end | |
221 | ||
234b917a AC |
222 | fun checkTyp G (tAll as (t, loc)) = |
223 | let | |
224 | val err = ErrorMsg.error (SOME loc) | |
225 | in | |
226 | case t of | |
227 | TBase name => | |
228 | if lookupType G name then | |
229 | tAll | |
230 | else | |
231 | (err ("Unbound type name " ^ name); | |
232 | (TError, loc)) | |
233 | | TList t => (TList (checkTyp G t), loc) | |
234 | | TArrow (d, r) => (TArrow (checkTyp G d, checkTyp G r), loc) | |
095de39e AC |
235 | | TAction (p, d, r) => (checkPred G p; |
236 | (TAction (p, SM.map (checkTyp G) d, | |
237 | SM.map (checkTyp G) r), loc)) | |
238 | | TNested (p, t) => (checkPred G p; | |
239 | (TNested (p, checkTyp G t), loc)) | |
234b917a AC |
240 | | TError => raise Fail "TError in parser-generated type" |
241 | | TUnif _ => raise Fail "TUnif in parser-generated type" | |
242 | end | |
243 | ||
8a7c40fa AC |
244 | fun envVarSetFrom v (e, _) = |
245 | case e of | |
246 | ESet (v', e) => | |
247 | if v = v' then | |
248 | SOME e | |
249 | else | |
250 | NONE | |
251 | | EGet (_, _, e) => envVarSetFrom v e | |
252 | | ESeq es => foldr (fn (e, found) => | |
253 | case found of | |
254 | SOME _ => found | |
255 | | NONE => envVarSetFrom v e) | |
256 | NONE es | |
257 | | ELocal (_, e) => envVarSetFrom v e | |
258 | ||
259 | | _ => NONE | |
260 | ||
27d9de59 AC |
261 | fun checkExp G (eAll as (e, loc)) = |
262 | let | |
e1b99e23 | 263 | val dte = Describe.describe_type_error loc |
27d9de59 AC |
264 | in |
265 | case e of | |
266 | EInt _ => (TBase "int", loc) | |
267 | | EString _ => (TBase "string", loc) | |
268 | | EList es => | |
269 | let | |
270 | val t = (newUnif (), loc) | |
271 | in | |
272 | foldl (fn (e', ret) => | |
273 | let | |
274 | val t' = checkExp G e' | |
275 | in | |
6be996d4 | 276 | (hasTyp (eAll, t', t); |
27d9de59 AC |
277 | if isError t' then |
278 | (TList (TError, loc), loc) | |
279 | else | |
280 | ret) | |
281 | handle Unify ue => | |
282 | (dte (WrongType ("List element", | |
283 | e', | |
284 | t', | |
285 | t, | |
286 | SOME ue)); | |
287 | (TError, loc)) | |
288 | end) (TList t, loc) es | |
289 | end | |
290 | ||
291 | | ELam (x, to, e) => | |
292 | let | |
293 | val t = | |
294 | case to of | |
295 | NONE => (newUnif (), loc) | |
234b917a | 296 | | SOME t => checkTyp G t |
27d9de59 | 297 | |
492c1cff | 298 | val G' = bindVal G (x, t, NONE) |
27d9de59 AC |
299 | val t' = checkExp G' e |
300 | in | |
301 | (TArrow (t, t'), loc) | |
302 | end | |
303 | | EVar x => | |
234b917a | 304 | (case lookupVal G x of |
27d9de59 AC |
305 | NONE => (dte (UnboundVariable x); |
306 | (TError, loc)) | |
307 | | SOME t => t) | |
308 | | EApp (func, arg) => | |
309 | let | |
310 | val dom = (newUnif (), loc) | |
311 | val ran = (newUnif (), loc) | |
312 | ||
313 | val tf = checkExp G func | |
314 | val ta = checkExp G arg | |
315 | in | |
6be996d4 AC |
316 | (hasTyp (func, tf, (TArrow (dom, ran), loc)); |
317 | hasTyp (arg, ta, dom) | |
27d9de59 AC |
318 | handle Unify ue => |
319 | dte (WrongType ("Function argument", | |
320 | arg, | |
321 | ta, | |
322 | dom, | |
323 | SOME ue)); | |
324 | ran) | |
325 | handle Unify ue => | |
326 | (dte (WrongForm ("Function to be applied", | |
327 | "function", | |
328 | func, | |
329 | tf, | |
330 | SOME ue)); | |
331 | (TError, loc)) | |
332 | end | |
db427c67 | 333 | |
6bb366c5 AC |
334 | | EALam (x, p, e) => |
335 | let | |
336 | val p' = checkPred G p | |
337 | ||
338 | val G' = bindVal G (x, (TAction (p, SM.empty, SM.empty), loc), NONE) | |
cdb376d4 | 339 | val t' = whnorm (checkExp G' e) |
6bb366c5 AC |
340 | in |
341 | case t' of | |
342 | (TAction _, _) => (TNested (p, t'), loc) | |
343 | | _ => (dte (WrongForm ("Body of nested configuration 'fn'", | |
344 | "action", | |
345 | e, | |
346 | t', | |
347 | NONE)); | |
348 | (TError, loc)) | |
349 | end | |
350 | ||
db427c67 AC |
351 | | ESet (evar, e) => |
352 | let | |
353 | val t = checkExp G e | |
354 | in | |
355 | (TAction ((CPrefix (CRoot, loc), loc), | |
356 | SM.empty, | |
357 | SM.insert (SM.empty, evar, t)), | |
358 | loc) | |
359 | end | |
360 | | EGet (x, evar, rest) => | |
361 | let | |
362 | val xt = (newUnif (), loc) | |
492c1cff | 363 | val G' = bindVal G (x, xt, NONE) |
db427c67 AC |
364 | |
365 | val rt = whnorm (checkExp G' rest) | |
366 | in | |
367 | case rt of | |
368 | (TAction (p, d, r), _) => | |
369 | (case SM.find (d, evar) of | |
370 | NONE => (TAction (p, SM.insert (d, evar, xt), r), loc) | |
371 | | SOME xt' => | |
234b917a | 372 | (subTyp (xt', xt) |
db427c67 AC |
373 | handle Unify ue => |
374 | dte (WrongType ("Retrieved environment variable", | |
375 | (EVar x, loc), | |
376 | xt', | |
377 | xt, | |
378 | SOME ue)); | |
379 | rt)) | |
234b917a | 380 | | (TError, _) => rt |
db427c67 AC |
381 | | _ => (dte (WrongForm ("Body of environment variable read", |
382 | "action", | |
383 | rest, | |
384 | rt, | |
385 | NONE)); | |
386 | (TError, loc)) | |
387 | end | |
388 | ||
389 | | ESeq [] => raise Fail "Empty ESeq" | |
390 | | ESeq [e1] => checkExp G e1 | |
391 | | ESeq (e1 :: rest) => | |
392 | let | |
393 | val e2 = (ESeq rest, loc) | |
394 | ||
395 | val t1 = whnorm (checkExp G e1) | |
396 | val t2 = whnorm (checkExp G e2) | |
397 | in | |
398 | case t1 of | |
399 | (TAction (p1, d1, r1), _) => | |
400 | (case t2 of | |
401 | (TAction (p2, d2, r2), _) => | |
402 | let | |
403 | val p' = predSimpl (CAnd (p1, p2), loc) | |
404 | ||
405 | val d' = SM.foldli (fn (name, t, d') => | |
406 | case SM.find (r1, name) of | |
407 | NONE => | |
408 | (case SM.find (d', name) of | |
409 | NONE => SM.insert (d', name, t) | |
410 | | SOME t' => | |
8a7c40fa AC |
411 | ((case envVarSetFrom name e1 of |
412 | NONE => subTyp (t, t') | |
413 | | SOME e => hasTyp (e, t, t')) | |
db427c67 AC |
414 | handle Unify ue => |
415 | dte (WrongType ("Shared environment variable", | |
416 | (EVar name, loc), | |
db427c67 | 417 | t', |
8a7c40fa | 418 | t, |
db427c67 AC |
419 | SOME ue)); |
420 | d')) | |
421 | | SOME t' => | |
8a7c40fa AC |
422 | ((case envVarSetFrom name e1 of |
423 | NONE => subTyp (t, t') | |
424 | | SOME e => hasTyp (e, t, t')) | |
db427c67 AC |
425 | handle Unify ue => |
426 | dte (WrongType ("Shared environment variable", | |
427 | (EVar name, loc), | |
db427c67 | 428 | t', |
8a7c40fa | 429 | t, |
db427c67 AC |
430 | SOME ue)); |
431 | d')) | |
432 | d1 d2 | |
433 | ||
434 | val r' = SM.foldli (fn (name, t, r') => SM.insert (r', name, t)) | |
435 | r1 r2 | |
436 | in | |
437 | (TAction (p', d', r'), loc) | |
438 | end | |
234b917a | 439 | | (TError, _) => t2 |
db427c67 AC |
440 | | _ => (dte (WrongForm ("Action to be sequenced", |
441 | "action", | |
442 | e2, | |
443 | t2, | |
444 | NONE)); | |
445 | (TError, loc))) | |
234b917a | 446 | | (TError, _) => t1 |
db427c67 AC |
447 | | _ => (dte (WrongForm ("Action to be sequenced", |
448 | "action", | |
449 | e1, | |
450 | t1, | |
451 | NONE)); | |
452 | (TError, loc)) | |
453 | end | |
454 | ||
1a4e5a6c | 455 | | ELocal (e1, e2) => |
db427c67 | 456 | let |
1a4e5a6c AC |
457 | val t1 = whnorm (checkExp G e1) |
458 | val t2 = whnorm (checkExp G e2) | |
db427c67 | 459 | in |
1a4e5a6c AC |
460 | case t1 of |
461 | (TAction (p1, d1, r1), _) => | |
462 | (case t2 of | |
463 | (TAction (p2, d2, r2), _) => | |
464 | let | |
465 | val p' = predSimpl (CAnd (p1, p2), loc) | |
466 | ||
467 | val d' = SM.foldli (fn (name, t, d') => | |
468 | case SM.find (r1, name) of | |
469 | NONE => | |
470 | (case SM.find (d', name) of | |
471 | NONE => SM.insert (d', name, t) | |
472 | | SOME t' => | |
8a7c40fa AC |
473 | ((case envVarSetFrom name e1 of |
474 | NONE => subTyp (t', t) | |
475 | | SOME e => hasTyp (e, t', t)) | |
1a4e5a6c AC |
476 | handle Unify ue => |
477 | dte (WrongType ("Shared environment variable", | |
478 | (EVar name, loc), | |
1a4e5a6c | 479 | t', |
8a7c40fa | 480 | t, |
1a4e5a6c AC |
481 | SOME ue)); |
482 | d')) | |
483 | | SOME t' => | |
8a7c40fa AC |
484 | ((case envVarSetFrom name e1 of |
485 | NONE => subTyp (t', t) | |
486 | | SOME e => hasTyp (e, t', t)) | |
1a4e5a6c AC |
487 | handle Unify ue => |
488 | dte (WrongType ("Shared environment variable", | |
489 | (EVar name, loc), | |
1a4e5a6c | 490 | t', |
8a7c40fa | 491 | t, |
1a4e5a6c AC |
492 | SOME ue)); |
493 | d')) | |
494 | d1 d2 | |
495 | in | |
496 | (TAction (p', d', r2), loc) | |
497 | end | |
498 | | (TError, _) => t2 | |
499 | | _ => (dte (WrongForm ("Action to be sequenced", | |
500 | "action", | |
501 | e2, | |
502 | t2, | |
503 | NONE)); | |
504 | (TError, loc))) | |
505 | | (TError, _) => t1 | |
506 | | _ => (dte (WrongForm ("Action to be sequenced", | |
db427c67 | 507 | "action", |
1a4e5a6c AC |
508 | e1, |
509 | t1, | |
db427c67 AC |
510 | NONE)); |
511 | (TError, loc)) | |
512 | end | |
234b917a | 513 | |
1a4e5a6c | 514 | |
234b917a AC |
515 | | EWith (e1, e2) => |
516 | let | |
517 | val t1 = whnorm (checkExp G e1) | |
518 | val t2 = whnorm (checkExp G e2) | |
519 | in | |
520 | case t1 of | |
1a4e5a6c | 521 | (TNested (pd, (TAction (pr, d1, r1), _)), _) => |
234b917a AC |
522 | (case t2 of |
523 | (TAction (p, d, r), _) => | |
524 | if predImplies (pd, p) then | |
1a4e5a6c AC |
525 | let |
526 | val combineRecs = | |
527 | SM.unionWithi (fn (name, t1, t2) => | |
528 | (subTyp (t1, t2) | |
529 | handle Unify ue => | |
530 | dte (WrongType ("Environment variable", | |
531 | (EVar name, loc), | |
532 | t1, | |
533 | t2, | |
534 | SOME ue)); | |
535 | t2)) | |
536 | in | |
537 | (TAction (pr, combineRecs (d, d1), | |
538 | combineRecs (r, r1)), loc) | |
539 | end | |
234b917a AC |
540 | else |
541 | (dte (WrongPred ("nested action", | |
542 | pd, | |
543 | p)); | |
544 | (TError, loc)) | |
545 | | (TError, _) => t2 | |
546 | | _ => | |
547 | (dte (WrongForm ("Body of nested action", | |
548 | "action", | |
549 | e2, | |
550 | t2, | |
551 | NONE)); | |
552 | (TError, loc))) | |
553 | | (TError, _) => t1 | |
554 | | _ => | |
555 | (dte (WrongForm ("Container of nested action", | |
556 | "action", | |
557 | e1, | |
558 | t1, | |
559 | NONE)); | |
560 | (TError, loc)) | |
561 | end | |
562 | ||
563 | | ESkip => (TAction ((CPrefix (CRoot, loc), loc), | |
564 | SM.empty, SM.empty), loc) | |
27d9de59 AC |
565 | end |
566 | ||
567 | exception Ununif | |
568 | ||
569 | fun ununif (tAll as (t, loc)) = | |
570 | case t of | |
571 | TBase _ => tAll | |
572 | | TList t => (TList (ununif t), loc) | |
573 | | TArrow (d, r) => (TArrow (ununif d, ununif r), loc) | |
574 | | TAction (p, d, r) => (TAction (p, SM.map ununif d, SM.map ununif r), loc) | |
575 | | TUnif (_, ref (SOME t)) => ununif t | |
234b917a | 576 | | TNested _ => tAll |
27d9de59 AC |
577 | | TError => tAll |
578 | ||
579 | | TUnif (_, ref NONE) => raise Ununif | |
580 | ||
581 | fun hasError (t, _) = | |
582 | case t of | |
583 | TBase _ => false | |
584 | | TList t => hasError t | |
585 | | TArrow (d, r) => hasError d orelse hasError r | |
586 | | TAction (p, d, r) => List.exists hasError (SM.listItems d) | |
587 | orelse List.exists hasError (SM.listItems r) | |
234b917a | 588 | | TNested _ => false |
27d9de59 AC |
589 | | TError => false |
590 | | TUnif (_, ref (SOME t)) => hasError t | |
591 | | TUnif (_, ref NONE) => false | |
592 | ||
593 | ||
594 | fun checkUnit G (eAll as (_, loc)) = | |
595 | let | |
596 | val _ = resetUnif () | |
597 | val t = checkExp G eAll | |
598 | in | |
599 | if hasError t then | |
600 | t | |
601 | else | |
602 | ununif t | |
603 | handle Ununif => | |
604 | (ErrorMsg.error (SOME loc) "Unification variables remain in type:"; | |
9b7ee2b2 | 605 | output (p_typ t); |
27d9de59 AC |
606 | t) |
607 | end | |
608 | ||
234b917a AC |
609 | fun checkDecl G (d, _, loc) = |
610 | case d of | |
b3159a70 AC |
611 | DExternType name => |
612 | if !externFlag then | |
613 | bindType G name | |
614 | else | |
615 | (ErrorMsg.error (SOME loc) "'extern type' not allowed in untrusted code"; | |
616 | G) | |
617 | | DExternVal (name, t) => | |
618 | if !externFlag then | |
619 | bindVal G (name, checkTyp G t, NONE) | |
620 | else | |
621 | (ErrorMsg.error (SOME loc) "'extern val' not allowed in untrusted code"; | |
622 | G) | |
492c1cff AC |
623 | | DVal (name, to, e) => |
624 | let | |
625 | val to = | |
626 | case to of | |
627 | NONE => (newUnif (), loc) | |
628 | | SOME to => checkTyp G to | |
629 | ||
630 | val t = checkExp G e | |
631 | in | |
6be996d4 | 632 | hasTyp (e, t, to) |
492c1cff | 633 | handle Unify ue => |
e1b99e23 AC |
634 | Describe.describe_type_error loc |
635 | (WrongType ("Bound value", | |
636 | e, | |
637 | t, | |
638 | to, | |
639 | SOME ue)); | |
492c1cff AC |
640 | bindVal G (name, to, SOME e) |
641 | end | |
095de39e | 642 | | DContext name => bindContext G name |
234b917a | 643 | |
095de39e | 644 | fun checkFile G tInit (_, ds, eo) = |
234b917a AC |
645 | let |
646 | val G' = foldl (fn (d, G) => checkDecl G d) G ds | |
647 | in | |
648 | case eo of | |
649 | NONE => () | |
650 | | SOME (e as (_, loc)) => | |
651 | let | |
652 | val t = checkExp G' e | |
653 | in | |
6be996d4 | 654 | hasTyp (e, t, tInit) |
234b917a AC |
655 | handle Unify ue => |
656 | (ErrorMsg.error (SOME loc) "Bad type for final expression of source file."; | |
657 | preface ("Actual:", p_typ t); | |
658 | preface ("Needed:", p_typ tInit)) | |
659 | end; | |
660 | G' | |
661 | end | |
662 | ||
27d9de59 | 663 | end |