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28bf4b0b | 1 | /* |
11db3170 | 2 | ** Splint - annotation-assisted static program checker |
28bf4b0b | 3 | ** Copyright (C) 1994-2001 University of Virginia, |
4 | ** Massachusetts Institute of Technology | |
5 | ** | |
6 | ** This program is free software; you can redistribute it and/or modify it | |
7 | ** under the terms of the GNU General Public License as published by the | |
8 | ** Free Software Foundation; either version 2 of the License, or (at your | |
9 | ** option) any later version. | |
10 | ** | |
11 | ** This program is distributed in the hope that it will be useful, but | |
12 | ** WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | ** General Public License for more details. | |
15 | ** | |
16 | ** The GNU General Public License is available from http://www.gnu.org/ or | |
17 | ** the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
18 | ** MA 02111-1307, USA. | |
19 | ** | |
20 | ** For information on lclint: lclint-request@cs.virginia.edu | |
21 | ** To report a bug: lclint-bug@cs.virginia.edu | |
11db3170 | 22 | ** For more information: http://www.splint.org |
28bf4b0b | 23 | */ |
24 | /* | |
25 | ** transferChecks.c | |
26 | */ | |
27 | ||
28 | # include "lclintMacros.nf" | |
29 | # include "basic.h" | |
30 | # include "transferChecks.h" | |
31 | ||
32 | static void checkStructTransfer (exprNode p_lhs, sRef p_slhs, exprNode p_rhs, sRef p_srhs, | |
33 | fileloc p_loc, transferKind p_tt); | |
34 | static void checkMetaStateConsistent (/*@exposed@*/ sRef p_fref, sRef p_tref, | |
35 | fileloc p_loc, transferKind p_transferType) ; | |
36 | ||
37 | static void checkLeaveTrans (uentry p_actual, transferKind p_transferType); | |
38 | static void checkTransfer (exprNode p_fexp, /*@dependent@*/ sRef p_fref, | |
39 | exprNode p_texp, /*@dependent@*/ sRef p_tref, | |
0bf5022d | 40 | exprNode p_fcn, /* for printing better error messages */ |
28bf4b0b | 41 | fileloc p_loc, transferKind p_transferType); |
42 | static void checkGlobTrans (uentry p_glob, transferKind p_type); | |
43 | ||
44 | static ynm | |
45 | checkCompletelyDefined (exprNode p_fexp, /*@exposed@*/ sRef p_fref, sRef p_ofref, | |
46 | exprNode p_texp, sRef p_tref, | |
47 | bool p_topLevel, bool p_inUnion, bool p_directUnion, | |
48 | fileloc p_loc, transferKind p_transferType, int p_depth, | |
49 | bool p_report); | |
50 | ||
51 | static /*@exposed@*/ sRef dependentReference (sRef p_sr); | |
52 | static bool canLoseLocalReference (/*@dependent@*/ sRef p_sr, fileloc p_loc) ; | |
53 | ||
54 | /* | |
55 | ** returns the most specific alkind | |
56 | */ | |
57 | ||
58 | alkind alkind_resolve (alkind a1, alkind a2) | |
59 | { | |
60 | if (a1 == AK_UNKNOWN || a1 == AK_ERROR) return a2; | |
61 | if (a2 == AK_UNKNOWN || a2 == AK_ERROR || a2 == AK_LOCAL) return a1; | |
62 | if (a1 == AK_LOCAL) return a2; | |
63 | return a1; | |
64 | } | |
65 | ||
66 | /* | |
67 | ** tref <- fref | |
68 | ** | |
69 | ** transferType: | |
70 | ** FCNRETURN return fref; tref is return type | |
71 | ** GLOBASSIGN tref = fref; | |
72 | ** FCNPASS call (fref) ; tref is the argument type | |
73 | ** | |
74 | */ | |
75 | ||
76 | static /*@only@*/ cstring | |
77 | transferErrorMessage (transferKind transferType, alkind tkind) /*@*/ | |
78 | { | |
79 | switch (transferType) | |
80 | { | |
81 | case TT_FCNRETURN: | |
82 | return (message ("returned as %s", alkind_unparse (tkind))); | |
83 | case TT_DOASSIGN: | |
84 | return (message ("assigned to %s", alkind_unparse (tkind))); | |
85 | case TT_FIELDASSIGN: | |
86 | return (message ("assigned to %s", alkind_unparse (tkind))); | |
87 | case TT_GLOBINIT: | |
88 | return (message ("used as initial value for %s", | |
89 | alkind_unparse (tkind))); | |
90 | case TT_FCNPASS: | |
91 | return (message ("passed as %s param", alkind_unparse (tkind))); | |
92 | BADDEFAULT; | |
93 | } | |
94 | BADEXIT; | |
95 | } | |
96 | ||
97 | static /*@only@*/ cstring | |
0bf5022d | 98 | transferErrorExcerpt (transferKind transferType, exprNode fexp, exprNode texp, exprNode fcn) /*@*/ |
28bf4b0b | 99 | { |
100 | switch (transferType) | |
101 | { | |
102 | case TT_FCNRETURN: | |
103 | return (message ("return %s", exprNode_unparse (fexp))); | |
104 | case TT_FIELDASSIGN: | |
105 | case TT_DOASSIGN: | |
106 | case TT_GLOBINIT: | |
107 | return (message ("%s = %s", exprNode_unparse (texp), exprNode_unparse (fexp))); | |
108 | case TT_FCNPASS: | |
0bf5022d | 109 | if (exprNode_isDefined (fcn)) |
110 | { | |
111 | return message ("%s(..., %s, ...)", | |
112 | exprNode_unparse (fcn), | |
113 | exprNode_unparse (fexp)); | |
114 | } | |
115 | else | |
116 | { | |
117 | return cstring_copy (exprNode_unparse (fexp)); | |
118 | } | |
28bf4b0b | 119 | BADDEFAULT; |
120 | } | |
121 | BADEXIT; | |
122 | } | |
123 | ||
124 | static cstring | |
125 | transferErrorExpMessage (transferKind transferType, exkind tkind) /*@*/ | |
126 | { | |
127 | if (exkind_isUnknown (tkind)) | |
128 | { | |
129 | switch (transferType) | |
130 | { | |
131 | case TT_FCNRETURN: | |
132 | return (cstring_makeLiteral ("returned without qualification")); | |
133 | case TT_FIELDASSIGN: | |
134 | case TT_DOASSIGN: | |
135 | return (cstring_makeLiteral ("assigned to unqualified reference")); | |
136 | case TT_FCNPASS: | |
137 | return (cstring_makeLiteral ("passed without qualification")); | |
138 | case TT_GLOBINIT: | |
139 | return (cstring_makeLiteral ("used as initial value for unqualified storage")); | |
140 | BADDEFAULT; | |
141 | } | |
142 | } | |
143 | else | |
144 | { | |
145 | switch (transferType) | |
146 | { | |
147 | case TT_FCNRETURN: | |
148 | return (message ("returned as %s", exkind_unparse (tkind))); | |
149 | case TT_FIELDASSIGN: | |
150 | case TT_DOASSIGN: | |
151 | return (message ("assigned to %s", exkind_unparse (tkind))); | |
152 | case TT_FCNPASS: | |
153 | return (message ("passed as %s param", exkind_unparse (tkind))); | |
154 | BADDEFAULT; | |
155 | } | |
156 | } | |
157 | ||
158 | BADEXIT; | |
159 | } | |
160 | ||
161 | static /*@observer@*/ cstring | |
162 | transferNullMessage (transferKind transferType) /*@*/ | |
163 | { | |
164 | switch (transferType) | |
165 | { | |
166 | case TT_FCNRETURN: | |
167 | return (cstring_makeLiteralTemp ("returned as non-null")); | |
168 | case TT_DOASSIGN: | |
169 | case TT_FIELDASSIGN: | |
170 | return (cstring_makeLiteralTemp ("assigned to non-null")); | |
171 | case TT_GLOBINIT: | |
172 | return (cstring_makeLiteralTemp ("initialized to non-null")); | |
173 | case TT_FCNPASS: | |
174 | return (cstring_makeLiteralTemp ("passed as non-null param")); | |
175 | BADDEFAULT; | |
176 | } | |
177 | BADEXIT; | |
178 | } | |
179 | ||
180 | static /*@dependent@*/ exprNode atFunction = exprNode_undefined; | |
181 | static int atArgNo = 0; | |
182 | static int atNumArgs = 0; | |
183 | ||
184 | static cstring generateText (exprNode e1, exprNode e2, | |
185 | sRef tref, transferKind tt) | |
186 | /*@*/ | |
187 | { | |
188 | if (tt == TT_DOASSIGN || tt == TT_GLOBINIT) | |
189 | { | |
190 | return (message ("%s = %s", exprNode_unparse (e2), | |
191 | exprNode_unparse (e1))); | |
192 | } | |
193 | else if (tt == TT_FIELDASSIGN) | |
194 | { | |
195 | return (message ("%s = %s (field %q)", | |
196 | exprNode_unparse (e2), | |
197 | exprNode_unparse (e1), | |
198 | sRef_unparse (tref))); | |
199 | } | |
200 | else if (tt == TT_FCNPASS) | |
201 | { | |
202 | return (message ("%s (%s%s%s)", | |
203 | exprNode_unparse (atFunction), | |
204 | (atArgNo == 1 ? cstring_undefined | |
205 | : cstring_makeLiteralTemp ("..., ")), | |
206 | exprNode_unparse (e1), | |
207 | (atArgNo == atNumArgs ? cstring_undefined | |
208 | : cstring_makeLiteralTemp (", ...")))); | |
209 | } | |
210 | else | |
211 | { | |
212 | return (cstring_copy (exprNode_unparse (e1))); | |
213 | } | |
214 | } | |
215 | ||
216 | static /*@observer@*/ cstring | |
217 | transferType_unparse (transferKind transferType) /*@*/ | |
218 | { | |
219 | switch (transferType) | |
220 | { | |
221 | case TT_FCNRETURN: | |
222 | return (cstring_makeLiteralTemp ("Returned")); | |
223 | case TT_DOASSIGN: | |
224 | case TT_FIELDASSIGN: | |
225 | return (cstring_makeLiteralTemp ("Assigned")); | |
226 | case TT_FCNPASS: | |
227 | return (cstring_makeLiteralTemp ("Passed")); | |
228 | case TT_GLOBINIT: | |
229 | return (cstring_makeLiteralTemp ("Initialized")); | |
230 | case TT_GLOBRETURN: | |
231 | return (cstring_makeLiteralTemp ("GLOB RETURN!")); | |
232 | case TT_GLOBPASS: | |
233 | return (cstring_makeLiteralTemp ("GLOB PASS!")); | |
234 | case TT_PARAMRETURN: | |
235 | return (cstring_makeLiteralTemp ("PARAM RETURN!")); | |
236 | case TT_LEAVETRANS: | |
237 | return (cstring_makeLiteralTemp ("LEAVE TRANS!")); | |
238 | BADDEFAULT; | |
239 | } | |
240 | BADEXIT; | |
241 | } | |
242 | ||
243 | static /*@observer@*/ cstring udError (sRef s) | |
244 | { | |
245 | if (sRef_isDead (s)) | |
246 | { | |
247 | return cstring_makeLiteralTemp ("released"); | |
248 | } | |
249 | else if (sRef_isAllocated (s)) | |
250 | { | |
251 | return cstring_makeLiteralTemp ("allocated but not defined"); | |
252 | } | |
253 | else | |
254 | { | |
255 | return cstring_makeLiteralTemp ("undefined"); | |
256 | } | |
257 | } | |
258 | ||
259 | static /*@only@*/ | |
260 | cstring defExpl (sRef s) /*@*/ | |
261 | { | |
262 | sRef rb = sRef_getRootBase (s); | |
263 | ||
264 | if (sRef_sameName (rb, s)) | |
265 | { | |
266 | if (sRef_isAllocated (s)) | |
267 | { | |
268 | return cstring_makeLiteral (" (allocated only)"); | |
269 | } | |
270 | return cstring_undefined; | |
271 | } | |
272 | else | |
273 | { | |
274 | return (message (" (%q is %s)", sRef_unparse (s), udError (s))); | |
275 | } | |
276 | } | |
277 | ||
278 | /* | |
279 | ** | |
280 | ** More than just definition checking --- checks for consistent state also! | |
281 | ** | |
282 | ** Returns TRUE if fref is completely defined. | |
283 | ** if !report, returns TRUE unless error is at the deep level. | |
284 | */ | |
285 | ||
286 | static ynm | |
287 | checkCompletelyDefined (exprNode fexp, /*@exposed@*/ sRef fref, sRef ofref, | |
288 | exprNode texp, sRef tref, | |
289 | bool topLevel, bool inUnion, bool directUnion, | |
290 | fileloc loc, transferKind transferType, | |
291 | int depth, bool report) | |
292 | { | |
293 | ctype ct; | |
294 | alkind fkind = sRef_getAliasKind (fref); | |
295 | alkind tkind = sRef_getAliasKind (tref); | |
3120b462 | 296 | |
28bf4b0b | 297 | DPRINTF (("Check completely defined: %s [%s] / %s [%s]", |
298 | exprNode_unparse (fexp), sRef_unparseFull (fref), | |
299 | exprNode_unparse (texp), sRef_unparseFull (tref))); | |
300 | ||
301 | if (depth > MAXDEPTH) | |
302 | { | |
303 | llquietbug | |
304 | (message | |
305 | ("Check definition limit exceeded, checking %q. " | |
306 | "This either means there is a variable with at least " | |
307 | "%d indirections apparent in the program text, or " | |
11db3170 | 308 | "there is a bug in Splint.", |
28bf4b0b | 309 | sRef_unparse (fref), |
310 | MAXDEPTH)); | |
311 | ||
312 | return YES; | |
313 | } | |
314 | ||
315 | if (!sRef_isKnown (fref)) | |
316 | { | |
317 | return YES; | |
318 | } | |
319 | ||
320 | if (sRef_isDead (fref)) | |
321 | { | |
322 | DPRINTF (("Dead storage to completely defined: %s", sRef_unparseFull (fref))); | |
323 | } | |
324 | ||
325 | if (alkind_isStack (fkind)) | |
326 | { | |
327 | ctype rt = ctype_realType (sRef_getType (tref)); | |
328 | ||
329 | if (ctype_isMutable (rt) && !ctype_isSU (rt)) | |
330 | { | |
331 | if (transferType == TT_PARAMRETURN) | |
332 | { | |
333 | if (optgenerror | |
334 | (FLG_RETSTACK, | |
335 | message | |
336 | ("Stack-allocated storage %qreachable from parameter %q", | |
337 | sRef_unparseOpt (fref), | |
338 | sRef_unparse (ofref)), | |
339 | loc)) | |
340 | { | |
341 | sRef_showAliasInfo (fref); | |
342 | } | |
343 | } | |
344 | else if (transferType == TT_GLOBRETURN) | |
345 | { | |
346 | if (optgenerror | |
347 | (FLG_RETSTACK, | |
348 | message | |
349 | ("Stack-allocated storage %qreachable from global %q", | |
350 | sRef_unparseOpt (fref), | |
351 | sRef_unparse (ofref)), | |
352 | loc)) | |
353 | { | |
354 | sRef_showAliasInfo (fref); | |
355 | } | |
356 | } | |
357 | else if (transferType == TT_FCNRETURN) | |
358 | { | |
359 | if (optgenerror | |
360 | (FLG_RETSTACK, | |
361 | message | |
362 | ("Stack-allocated storage %qreachable from return value: %s", | |
363 | sRef_unparseOpt (fref), | |
364 | exprNode_unparse (fexp)), | |
365 | loc)) | |
366 | { | |
367 | sRef_showAliasInfo (fref); | |
368 | } | |
369 | } | |
370 | else | |
371 | { | |
372 | /* no error */ | |
373 | } | |
374 | } | |
375 | } | |
376 | ||
377 | if (!topLevel) | |
378 | { | |
379 | DPRINTF (("From: %s ==> %s", | |
380 | sRef_unparseFull (fref), | |
381 | sRef_unparseFull (tref))); | |
382 | ||
383 | checkMetaStateConsistent (fref, tref, loc, transferType); | |
384 | ||
385 | if ((sRef_isObserver (fref) && !sRef_isObserver (tref)) | |
386 | || (sRef_isExposed (fref) && !(sRef_isObserver (tref) | |
387 | || sRef_isExposed (tref)))) | |
388 | { | |
389 | flagcode code = (sRef_isObserver (fref) | |
390 | ? FLG_OBSERVERTRANS : FLG_EXPOSETRANS); | |
391 | ||
392 | if (!sRef_isStateLive (fref)) | |
393 | { | |
394 | ; /* no error (will be a definition error) */ | |
395 | } | |
396 | else if (transferType == TT_DOASSIGN | |
397 | || transferType == TT_FIELDASSIGN | |
398 | || transferType == TT_GLOBINIT | |
399 | || transferType == TT_FCNPASS) | |
400 | { | |
401 | ; /* no error */ | |
402 | } | |
403 | else if (transferType == TT_PARAMRETURN) | |
404 | { | |
405 | if (optgenerror | |
406 | (code, | |
407 | message | |
408 | ("%s storage %qreachable from %s parameter", | |
409 | exkind_capName (sRef_getExKind (fref)), | |
410 | sRef_unparseOpt (fref), | |
411 | exkind_unparseError (sRef_getExKind (tref))), | |
412 | loc)) | |
413 | { | |
414 | sRef_showExpInfo (fref); | |
415 | sRef_setExKind (fref, XO_UNKNOWN, loc); | |
416 | } | |
417 | } | |
418 | else if (transferType == TT_LEAVETRANS) | |
419 | { | |
420 | ; | |
421 | } | |
422 | else if (transferType == TT_GLOBINIT) | |
423 | { | |
424 | if (optgenerror | |
425 | (code, | |
426 | message | |
427 | ("%s storage %qreachable from %s initial value", | |
428 | exkind_capName (sRef_getExKind (fref)), | |
429 | sRef_unparseOpt (fref), | |
430 | exkind_unparseError (sRef_getExKind (tref))), | |
431 | loc)) | |
432 | { | |
433 | sRef_showExpInfo (fref); | |
434 | sRef_setExKind (fref, XO_UNKNOWN, loc); | |
435 | } | |
436 | } | |
437 | else if (transferType == TT_GLOBRETURN) | |
438 | { | |
439 | if (optgenerror | |
440 | (code, | |
441 | message | |
442 | ("%s storage %qreachable from %s global", | |
443 | exkind_capName (sRef_getExKind (fref)), | |
444 | sRef_unparseOpt (fref), | |
445 | exkind_unparseError (sRef_getExKind (tref))), | |
446 | loc)) | |
447 | { | |
448 | sRef_showExpInfo (fref); | |
449 | sRef_setExKind (fref, XO_UNKNOWN, loc); | |
450 | } | |
451 | } | |
452 | else if (transferType == TT_FCNRETURN) | |
453 | { | |
454 | if (optgenerror | |
455 | (code, | |
456 | message | |
457 | ("%s storage %qreachable from %s return value", | |
458 | exkind_capName (sRef_getExKind (fref)), | |
459 | sRef_unparseOpt (fref), | |
460 | exkind_unparseError (sRef_getExKind (tref))), | |
461 | loc)) | |
462 | { | |
463 | sRef_showExpInfo (fref); | |
464 | sRef_setExKind (fref, XO_UNKNOWN, loc); | |
465 | } | |
466 | } | |
467 | else | |
468 | { | |
469 | llcontbug (message ("Transfer type: %s", | |
470 | transferType_unparse (transferType))); | |
471 | ||
472 | if (optgenerror | |
473 | (code, | |
474 | message | |
475 | ("%s storage %qreachable from %s return value", | |
476 | exkind_capName (sRef_getExKind (fref)), | |
477 | sRef_unparseOpt (fref), | |
478 | exkind_unparseError (sRef_getExKind (tref))), | |
479 | loc)) | |
480 | { | |
481 | sRef_showExpInfo (fref); | |
482 | sRef_setExKind (fref, XO_UNKNOWN, loc); | |
483 | } | |
484 | } | |
485 | ||
486 | } | |
487 | ||
488 | if (!alkind_compatible (fkind, tkind)) | |
489 | { | |
490 | if (fkind == AK_UNKNOWN && !sRef_isStateLive (fref)) | |
491 | { | |
492 | ; /* no error (will be a definition error) */ | |
493 | } | |
494 | else if (transferType == TT_DOASSIGN) | |
495 | { | |
496 | ; /* no error */ | |
497 | } | |
498 | else if (transferType == TT_FCNPASS) | |
499 | { | |
500 | if (alkind_isKnown (sRef_getAliasKind (tref))) | |
501 | { | |
502 | if (optgenerror | |
503 | (FLG_COMPMEMPASS, | |
504 | message | |
505 | ("Storage %qreachable from passed parameter " | |
506 | "is %s (should be %s): %s", | |
507 | sRef_unparseOpt (fref), | |
508 | alkind_unparse (sRef_getAliasKind (fref)), | |
509 | alkind_unparse (sRef_getAliasKind (tref)), | |
510 | exprNode_unparse (fexp)), | |
511 | loc)) | |
512 | { | |
513 | sRef_showAliasInfo (fref); | |
514 | } | |
515 | } | |
516 | } | |
517 | else if (transferType == TT_PARAMRETURN) | |
518 | { | |
519 | bool noerror = FALSE; | |
520 | ||
521 | if (alkind_isDependent (sRef_getAliasKind (fref))) | |
522 | { | |
523 | if (canLoseLocalReference (fref, loc)) | |
524 | { | |
525 | noerror = TRUE; | |
526 | } | |
527 | } | |
528 | ||
529 | if (!noerror | |
530 | && optgenerror | |
531 | (FLG_COMPMEMPASS, | |
532 | message | |
533 | ("Storage %qreachable from parameter is %s (should be %s)", | |
534 | sRef_unparseOpt (fref), | |
535 | alkind_unparse (sRef_getAliasKind (fref)), | |
536 | alkind_unparse (sRef_getAliasKind (tref))), | |
537 | loc)) | |
538 | { | |
539 | sRef_showAliasInfo (fref); | |
540 | } | |
541 | } | |
542 | else if (transferType == TT_LEAVETRANS) | |
543 | { | |
544 | if (optgenerror | |
545 | (FLG_COMPMEMPASS, | |
546 | message | |
547 | ("Storage %qreachable from temporary reference is %s " | |
548 | "at scope exit (should be %s)", | |
549 | sRef_unparseOpt (fref), | |
550 | alkind_unparse (sRef_getAliasKind (fref)), | |
551 | alkind_unparse (sRef_getAliasKind (tref))), | |
552 | loc)) | |
553 | { | |
554 | sRef_showAliasInfo (fref); | |
555 | } | |
556 | } | |
557 | else if (transferType == TT_GLOBRETURN) | |
558 | { | |
559 | if (optgenerror | |
560 | (FLG_COMPMEMPASS, | |
561 | message | |
562 | ("Storage %qreachable from global is %s (should be %s)", | |
563 | sRef_unparseOpt (fref), | |
564 | alkind_unparse (sRef_getAliasKind (fref)), | |
565 | alkind_unparse (sRef_getAliasKind (tref))), | |
566 | loc)) | |
567 | { | |
568 | sRef_showAliasInfo (fref); | |
569 | } | |
570 | } | |
571 | else if (transferType == TT_FCNRETURN) | |
572 | { | |
573 | if (optgenerror | |
574 | (FLG_COMPMEMPASS, | |
575 | message | |
576 | ("Storage %qreachable from return value is %s (should be %s)", | |
577 | sRef_unparseOpt (fref), | |
578 | alkind_unparse (sRef_getAliasKind (fref)), | |
579 | alkind_unparse (sRef_getAliasKind (tref))), | |
580 | loc)) | |
581 | { | |
582 | sRef_showAliasInfo (fref); | |
583 | } | |
584 | } | |
585 | else if (transferType == TT_GLOBINIT) | |
586 | { | |
587 | if (optgenerror | |
588 | (FLG_COMPMEMPASS, | |
589 | message | |
590 | ("Storage %qreachable from initial value is %s (should be %s)", | |
591 | sRef_unparseOpt (fref), | |
592 | alkind_unparse (sRef_getAliasKind (fref)), | |
593 | alkind_unparse (sRef_getAliasKind (tref))), | |
594 | loc)) | |
595 | { | |
596 | sRef_showAliasInfo (fref); | |
597 | } | |
598 | } | |
599 | else | |
600 | { | |
601 | llcontbug (message ("Transfer type: %s", | |
602 | transferType_unparse (transferType))); | |
603 | ||
604 | if (optgenerror | |
605 | (FLG_COMPMEMPASS, | |
606 | message | |
607 | ("Storage %qreachable from return value is %s (should be %s)", | |
608 | sRef_unparseOpt (fref), | |
609 | alkind_unparse (sRef_getAliasKind (fref)), | |
610 | alkind_unparse (sRef_getAliasKind (tref))), | |
611 | loc)) | |
612 | { | |
613 | sRef_showAliasInfo (fref); | |
614 | } | |
615 | } | |
616 | } | |
617 | ||
618 | if (sRef_isDead (fref)) | |
619 | { | |
620 | if (directUnion) | |
621 | { | |
622 | return NO; | |
623 | } | |
624 | ||
625 | if (transferType == TT_PARAMRETURN) | |
626 | { | |
627 | if (optgenerror | |
628 | (FLG_USERELEASED, | |
629 | message | |
630 | ("Released storage %q reachable from parameter at return point", | |
631 | sRef_unparse (fref)), | |
632 | loc)) | |
633 | { | |
634 | sRef_showStateInfo (fref); | |
635 | return YES; | |
636 | } | |
637 | } | |
638 | else if (transferType == TT_LEAVETRANS) | |
639 | { | |
640 | if (optgenerror | |
641 | (FLG_USERELEASED, | |
642 | message ("Released storage %q reachable from temporary " | |
643 | "reference at scope exit", | |
644 | sRef_unparse (fref)), | |
645 | loc)) | |
646 | { | |
647 | sRef_showStateInfo (fref); | |
648 | return YES; | |
649 | } | |
650 | } | |
651 | else if (transferType == TT_GLOBRETURN) | |
652 | { | |
653 | if (optgenerror | |
654 | (FLG_GLOBSTATE, | |
655 | message ("Released storage %q reachable from global", | |
656 | sRef_unparse (fref)), | |
657 | loc)) | |
658 | { | |
659 | sRef_showStateInfo (fref); | |
660 | return YES; | |
661 | } | |
662 | } | |
663 | else if (transferType == TT_FCNPASS) | |
664 | { | |
665 | if (optgenerror | |
666 | (FLG_USERELEASED, | |
667 | message ("Released storage %q reachable from passed parameter", | |
668 | sRef_unparse (fref)), | |
669 | loc)) | |
670 | { | |
671 | sRef_showStateInfo (fref); | |
672 | return YES; | |
673 | } | |
674 | } | |
675 | else | |
676 | { | |
677 | if (optgenerror | |
678 | (FLG_USERELEASED, | |
679 | message ("Released storage %q reachable from parameter", | |
680 | sRef_unparse (fref)), | |
681 | loc)) | |
682 | { | |
683 | sRef_showStateInfo (fref); | |
684 | return YES; | |
685 | } | |
686 | } | |
687 | } | |
688 | } | |
689 | ||
690 | if (!topLevel | |
691 | && sRef_possiblyNull (fref) | |
692 | && !sRef_perhapsNull (tref) | |
693 | && ctype_isRealPointer (sRef_getType (tref)) | |
694 | && !usymtab_isGuarded (fref)) | |
695 | { | |
696 | if (transferType == TT_FCNRETURN) | |
697 | { | |
698 | if (optgenerror | |
699 | (FLG_NULLRET, | |
700 | message ("%q storage %qderivable from return value: %s", | |
701 | cstring_capitalize (sRef_nullMessage (fref)), | |
702 | sRef_unparseOpt (fref), | |
703 | exprNode_unparse (fexp)), | |
704 | loc)) | |
705 | { | |
706 | sRef_showNullInfo (fref); | |
707 | ||
708 | DPRINTF (("fref: %s", sRef_unparseFull (fref))); | |
709 | DPRINTF (("tref: %s", sRef_unparseFull (tref))); | |
710 | ||
711 | sRef_setNullError (fref); | |
712 | } | |
713 | } | |
714 | else if (transferType == TT_GLOBRETURN || transferType == TT_PARAMRETURN) | |
715 | { | |
716 | if (optgenerror | |
717 | (FLG_NULLSTATE, | |
718 | message | |
719 | ("Function returns with %s storage derivable from %q %q", | |
720 | sRef_nullMessage (fref), | |
721 | cstring_makeLiteral ((transferType == TT_GLOBRETURN) | |
722 | ? "global" : "parameter"), | |
723 | sRef_unparse (fref)), | |
724 | loc)) | |
725 | { | |
726 | sRef_showNullInfo (fref); | |
727 | sRef_setNullError (fref); | |
728 | } | |
729 | } | |
730 | else if (transferType == TT_GLOBPASS) | |
731 | { | |
732 | if (optgenerror | |
733 | (FLG_NULLPASS, | |
734 | message ("Function called with %s storage " | |
735 | "derivable from global %q", | |
736 | sRef_nullMessage (fref), | |
737 | sRef_unparse (fref)), | |
738 | loc)) | |
739 | { | |
740 | sRef_showNullInfo (fref); | |
741 | sRef_setNullError (fref); | |
742 | } | |
743 | } | |
744 | else if (transferType == TT_FCNPASS) | |
745 | { | |
746 | if (optgenerror | |
747 | (FLG_NULLSTATE, | |
748 | message ("%q storage %qderivable from parameter %q", | |
749 | cstring_capitalize (sRef_nullMessage (fref)), | |
750 | sRef_unparseOpt (fref), | |
751 | generateText (fexp, exprNode_undefined, | |
752 | sRef_undefined, TT_FCNPASS)), | |
753 | loc)) | |
754 | { | |
cd7d9b17 | 755 | DPRINTF (("fref: %s", sRef_unparseFull (fref))); |
756 | DPRINTF (("tref: %s", sRef_unparseFull (tref))); | |
28bf4b0b | 757 | sRef_showNullInfo (fref); |
758 | sRef_setNullError (fref); | |
759 | } | |
760 | } | |
761 | else | |
762 | { | |
763 | llassert (transferType == TT_DOASSIGN | |
764 | || transferType == TT_GLOBINIT | |
765 | || transferType == TT_LEAVETRANS); | |
766 | } | |
767 | } | |
768 | ||
769 | if (sRef_isRelDef (tref) | |
770 | || sRef_isPartial (tref) | |
771 | || sRef_isAllocated (tref) | |
772 | || sRef_isStateSpecial (tref)) | |
773 | { | |
774 | /* should check fref is allocated? */ | |
775 | return YES; | |
776 | } | |
777 | ||
778 | ct = ctype_realType (sRef_getType (fref)); | |
779 | ||
3120b462 | 780 | DPRINTF (("Here: %s", ctype_unparse (ct))); |
781 | ||
28bf4b0b | 782 | if (!(sRef_isAnyDefined (fref) |
783 | || sRef_isPdefined (fref) | |
784 | || sRef_isAllocated (fref) | |
785 | || sRef_isStateUnknown (fref))) | |
786 | { | |
787 | if (transferType == TT_GLOBRETURN) | |
788 | { | |
789 | if (report | |
790 | && optgenerror | |
791 | (FLG_COMPDEF, | |
792 | message ("Function returns with global %q not " | |
793 | "completely defined%q", | |
794 | sRef_unparse (sRef_getRootBase (fref)), | |
795 | defExpl (fref)), | |
796 | loc)) | |
797 | { | |
798 | sRef_showStateInfo (fref); | |
799 | sRef_setDefined (fref, loc); | |
800 | } | |
801 | } | |
802 | else if (transferType == TT_GLOBPASS) | |
803 | { | |
804 | if (report && | |
805 | optgenerror | |
806 | (FLG_COMPDEF, | |
807 | message | |
808 | ("Function called with global %q not completely defined%q", | |
809 | sRef_unparse (sRef_getRootBase (fref)), | |
810 | defExpl (fref)), | |
811 | loc)) | |
812 | { | |
813 | sRef_showStateInfo (fref); | |
814 | sRef_setDefined (fref, loc); | |
815 | } | |
816 | } | |
817 | else if (transferType == TT_PARAMRETURN) | |
818 | { | |
819 | if (report && !topLevel | |
820 | && optgenerror | |
821 | (FLG_COMPDEF, | |
822 | message ("Function returns storage %q reachable from parameter not " | |
823 | "completely defined%q", | |
824 | sRef_unparse (ofref), | |
825 | defExpl (fref)), | |
826 | loc)) | |
827 | { | |
828 | sRef_showStateInfo (fref); | |
829 | sRef_setDefined (fref, loc); | |
830 | } | |
831 | } | |
832 | else if (transferType == TT_LEAVETRANS) | |
833 | { | |
834 | if (report && !topLevel | |
835 | && optgenerror | |
836 | (FLG_COMPDEF, | |
837 | message ("Scope exits with storage %q reachable from " | |
838 | "temporary reference not completely defined%q", | |
839 | sRef_unparse (ofref), | |
840 | defExpl (fref)), | |
841 | loc)) | |
842 | { | |
843 | sRef_showStateInfo (fref); | |
844 | sRef_setDefined (fref, loc); | |
845 | } | |
846 | } | |
847 | else | |
848 | { | |
849 | if (transferType != TT_DOASSIGN | |
850 | && (!(sRef_isNew (fref) || sRef_isType (fref)))) | |
851 | { | |
852 | if (report) | |
853 | { | |
854 | DPRINTF (("Here we are: %s", sRef_unparseFull (fref))); | |
855 | ||
856 | if (sRef_isDead (fref)) | |
857 | { | |
858 | if (optgenerror | |
859 | (FLG_USERELEASED, | |
860 | message ("%s storage %qwas released: %q", | |
861 | transferType_unparse (transferType), | |
862 | sRef_unparseOpt (fref), | |
863 | generateText (fexp, texp, tref, transferType)), | |
864 | loc)) | |
865 | { | |
866 | sRef_showStateInfo (fref); | |
867 | } | |
868 | } | |
869 | else | |
870 | { | |
871 | if (optgenerror | |
872 | (FLG_COMPDEF, | |
873 | message | |
874 | ("%s storage %qnot completely defined%q: %q", | |
875 | transferType_unparse (transferType), | |
876 | sRef_unparseOpt (ofref), | |
877 | defExpl (fref), | |
878 | generateText (fexp, texp, tref, transferType)), | |
879 | loc)) | |
880 | { | |
881 | sRef rb = sRef_getRootBase (fref); | |
882 | sRef_showStateInfo (fref); | |
3120b462 | 883 | |
884 | DPRINTF (("fref: %s", sRef_unparseFull (fref))); | |
885 | DPRINTF (("rb: %s", sRef_unparseFull (rb))); | |
28bf4b0b | 886 | sRef_setDefinedComplete (rb, loc); |
887 | } | |
888 | } | |
889 | } | |
890 | } | |
891 | else | |
892 | { | |
893 | ||
894 | if (sRef_isAllocated (fref) && sRef_isValid (tref) | |
895 | && (transferType == TT_DOASSIGN)) | |
896 | { | |
897 | sRef_setAllocatedComplete (tref, loc); | |
898 | } | |
899 | return YES; | |
900 | } | |
901 | } | |
902 | ||
903 | return NO; | |
904 | } | |
905 | ||
906 | if (ctype_isUnknown (ct)) | |
907 | { | |
908 | return YES; | |
909 | } | |
3120b462 | 910 | else if (ctype_isPointer (ct) || ctype_isArray (ct)) /* evans 2001-07-12 added ctype_isArray */ |
28bf4b0b | 911 | { |
912 | ctype tct = ctype_realType (sRef_getType (tref)); | |
913 | ||
914 | if (sRef_isStateUnknown (fref)) | |
915 | { | |
916 | return NO; | |
917 | } | |
918 | else | |
919 | { | |
3120b462 | 920 | DPRINTF (("Here fref: %s", sRef_unparseFull (fref))); |
cd7d9b17 | 921 | DPRINTF (("Here tref: %s", sRef_unparseFull (tref))); |
3120b462 | 922 | |
28bf4b0b | 923 | if (ctype_isAP (tct) || ctype_isUnknown (tct)) |
924 | { | |
925 | sRef fptr = sRef_constructDeref (fref); | |
926 | sRef tptr = sRef_constructDeref (tref); | |
927 | ||
cd7d9b17 | 928 | DPRINTF (("Here tptr: %s", sRef_unparseFull (tptr))); |
929 | ||
28bf4b0b | 930 | return (checkCompletelyDefined (fexp, fptr, ofref, |
931 | texp, tptr, | |
932 | FALSE, inUnion, FALSE, loc, | |
933 | transferType, depth + 1, report)); | |
934 | } | |
935 | else | |
936 | { | |
937 | return YES; | |
938 | } | |
939 | } | |
940 | } | |
28bf4b0b | 941 | else if (ctype_isStruct (ct)) |
942 | { | |
943 | ctype tct = ctype_realType (sRef_getType (tref)); | |
944 | ||
945 | DPRINTF (("Struct defined: %s", ctype_unparse (tct))); | |
946 | ||
947 | if (ctype_match (ct, tct)) | |
948 | { | |
949 | bool isOk = TRUE; | |
950 | bool hasOneDefined = FALSE; | |
951 | cstringSList badFields = cstringSList_undefined; | |
952 | ||
953 | if (sRef_isStateUnknown (fref) || sRef_isAllocated (tref)) | |
954 | { | |
955 | return YES; | |
956 | } | |
957 | ||
958 | DPRINTF (("Check field: %s", sRef_unparseFull (fref))); | |
959 | ||
960 | if (sRef_isPdefined (fref) || sRef_isAnyDefined (fref)) | |
961 | { | |
962 | DPRINTF (("Is defined: %s", sRef_unparse (fref))); | |
963 | ||
964 | sRefSet_realElements (sRef_derivedFields (fref), sr) | |
965 | { | |
966 | bool thisField; | |
967 | ||
968 | hasOneDefined = TRUE; | |
969 | ||
970 | DPRINTF (("Check derived: %s", sRef_unparseFull (sr))); | |
971 | ||
972 | if (sRef_isField (sr)) | |
973 | { | |
974 | cstring fieldname = sRef_getField (sr); | |
975 | sRef fldref = sRef_makeField (tref, fieldname); | |
976 | bool shouldCheck = !sRef_isRecursiveField (fldref); | |
977 | ||
978 | if (shouldCheck) | |
979 | { | |
980 | thisField = | |
981 | ynm_toBoolRelaxed | |
982 | (checkCompletelyDefined (fexp, sr, ofref, | |
983 | texp, fldref, | |
984 | FALSE, inUnion, FALSE, loc, | |
985 | transferType, depth + 1, | |
986 | FALSE)); | |
987 | } | |
988 | else | |
989 | { | |
990 | thisField = TRUE; | |
991 | } | |
992 | ||
993 | if (!thisField) | |
994 | { | |
995 | isOk = FALSE; | |
996 | badFields = cstringSList_add (badFields, | |
997 | sRef_getField (sr)); | |
998 | } | |
999 | } | |
1000 | } end_sRefSet_realElements; | |
1001 | } | |
1002 | else if (sRef_isAllocated (fref)) | |
1003 | { | |
1004 | /* | |
1005 | ** for structures, each field must be completely defined | |
1006 | */ | |
1007 | ||
1008 | uentryList fields = ctype_getFields (ct); | |
1009 | ||
1010 | uentryList_elements (fields, ue) | |
1011 | { | |
1012 | bool thisField; | |
1013 | cstring name = uentry_getRealName (ue); | |
1014 | sRef ffield = sRef_makeField (fref, name); | |
1015 | sRef tfield = sRef_makeField (tref, name); | |
1016 | bool shouldCheck = !sRef_isRecursiveField (tfield); | |
1017 | ||
1018 | if (!shouldCheck) | |
1019 | { | |
1020 | thisField = TRUE; | |
1021 | } | |
1022 | else | |
1023 | { | |
1024 | thisField = ynm_toBoolRelaxed | |
1025 | (checkCompletelyDefined (fexp, ffield, ofref, | |
1026 | texp, tfield, | |
1027 | FALSE, inUnion, FALSE, | |
1028 | loc, transferType, | |
1029 | depth + 1, FALSE)); | |
1030 | } | |
1031 | ||
1032 | if (!thisField) | |
1033 | { | |
1034 | isOk = FALSE; | |
1035 | badFields = cstringSList_add (badFields, uentry_rawName (ue)); | |
1036 | } | |
1037 | else | |
1038 | { | |
1039 | hasOneDefined = TRUE; | |
1040 | } | |
1041 | } end_uentryList_elements; | |
1042 | } | |
1043 | else | |
1044 | { | |
1045 | DPRINTF (("Not checking: %s", sRef_unparseFull (fref))); | |
1046 | } | |
1047 | ||
1048 | if (!isOk && (!inUnion || hasOneDefined)) | |
1049 | { | |
1050 | if (transferType == TT_GLOBRETURN) | |
1051 | { | |
1052 | if (optgenerror | |
1053 | (FLG_COMPDEF, | |
1054 | message ("Global storage %q contains %d undefined field%& " | |
1055 | "when call returns: %q", | |
1056 | sRef_unparse (fref), | |
1057 | cstringSList_size (badFields), | |
1058 | cstringSList_unparseAbbrev (badFields)), | |
1059 | loc)) | |
1060 | { | |
1061 | sRef_setDefined (fref, loc); | |
1062 | } | |
1063 | } | |
1064 | else if (transferType == TT_GLOBPASS) | |
1065 | { | |
1066 | if (optgenerror | |
1067 | (FLG_COMPDEF, | |
1068 | message ("Global storage %q contains %d undefined field%& " | |
1069 | "before call: %q", | |
1070 | sRef_unparse (fref), | |
1071 | cstringSList_size (badFields), | |
1072 | cstringSList_unparseAbbrev (badFields)), | |
1073 | loc)) | |
1074 | { | |
1075 | sRef_setDefined (fref, loc); | |
1076 | } | |
1077 | } | |
1078 | else if (transferType == TT_PARAMRETURN) | |
1079 | { | |
1080 | if (optgenerror | |
1081 | (FLG_COMPDEF, | |
1082 | message ("Storage %qreachable from parameter " | |
1083 | "contains %d undefined field%&: %q", | |
1084 | sRef_unparseOpt (fref), | |
1085 | cstringSList_size (badFields), | |
1086 | cstringSList_unparseAbbrev (badFields)), | |
1087 | loc)) | |
1088 | { | |
1089 | sRef_setDefined (fref, loc); | |
1090 | } | |
1091 | } | |
1092 | else if (transferType == TT_LEAVETRANS) | |
1093 | { | |
1094 | /* no error */ | |
1095 | } | |
1096 | else | |
1097 | { | |
1098 | if (optgenerror | |
1099 | (FLG_COMPDEF, | |
1100 | message ("%s storage %qcontains %d undefined field%&: %q", | |
1101 | transferType_unparse (transferType), | |
1102 | sRef_unparseOpt (fref), | |
1103 | cstringSList_size (badFields), | |
1104 | cstringSList_unparseAbbrev (badFields)), | |
1105 | loc)) | |
1106 | { | |
1107 | sRef_setDefined (fref, loc); | |
1108 | } | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | cstringSList_free (badFields); | |
1113 | ||
1114 | if (inUnion) | |
1115 | { | |
1116 | if (directUnion) | |
1117 | { | |
1118 | return (ynm_fromBool (hasOneDefined)); | |
1119 | } | |
1120 | else | |
1121 | { | |
1122 | return (MAYBE); | |
1123 | } | |
1124 | } | |
1125 | else | |
1126 | { | |
1127 | return (ynm_fromBool (!report || isOk)); | |
1128 | } | |
1129 | } | |
1130 | else | |
1131 | { | |
1132 | return YES; | |
1133 | } | |
1134 | } | |
1135 | else if (ctype_isUnion (ct)) | |
1136 | { | |
1137 | if (sRef_isStateUnknown (fref) || sRef_isAllocated (tref)) | |
1138 | { | |
1139 | return YES; | |
1140 | } | |
1141 | else | |
1142 | { | |
1143 | ctype tct = ctype_realType (sRef_getType (tref)); | |
1144 | ||
1145 | if (ctype_isKnown (tct) && ctype_match (ct, tct)) | |
1146 | { | |
1147 | cstringSList goodFields = cstringSList_new (); | |
1148 | bool isOk = FALSE; | |
1149 | int nelements = sRefSet_size (sRef_derivedFields (fref)); | |
1150 | ||
1151 | /* | |
1152 | ** for unions, at least one field must be completely defined | |
1153 | */ | |
1154 | ||
1155 | if (sRef_isPdefined (fref) || sRef_isAnyDefined (fref)) | |
1156 | { | |
1157 | isOk = TRUE; | |
1158 | } | |
1159 | ||
1160 | sRefSet_realElements (sRef_derivedFields (fref), sr) | |
1161 | { | |
1162 | bool thisField; | |
1163 | ||
1164 | if (sRef_isField (sr)) | |
1165 | { | |
1166 | sRef fldref = sRef_makeField (tref, sRef_getField (sr)); | |
1167 | ||
1168 | DPRINTF (("Trying union field: %s", sRef_unparseFull (fldref))); | |
1169 | ||
1170 | thisField = ynm_toBoolStrict | |
1171 | (checkCompletelyDefined | |
1172 | (fexp, sr, ofref, | |
1173 | texp, fldref, FALSE, inUnion, | |
1174 | (nelements > 1 ? TRUE : FALSE), | |
1175 | loc, transferType, depth + 1, FALSE)); | |
1176 | ||
1177 | if (thisField) | |
1178 | { | |
1179 | goodFields = cstringSList_add | |
1180 | (goodFields, sRef_getField (sr)); | |
1181 | } | |
1182 | } | |
1183 | } end_sRefSet_realElements; | |
1184 | ||
1185 | if (cstringSList_empty (goodFields) | |
1186 | && !isOk | |
1187 | && context_getFlag (FLG_UNIONDEF)) | |
1188 | { | |
1189 | if (!inUnion) | |
1190 | { | |
1191 | if (transferType == TT_PARAMRETURN) | |
1192 | { | |
1193 | voptgenerror | |
1194 | (FLG_UNIONDEF, | |
1195 | message ("Union %q reachable from parameter has " | |
1196 | "no defined field", | |
1197 | sRef_unparse (fref)), | |
1198 | loc); | |
1199 | } | |
1200 | else if (transferType == TT_LEAVETRANS) | |
1201 | { | |
1202 | voptgenerror | |
1203 | (FLG_UNIONDEF, | |
1204 | message ("Union %q has no defined field at scope exit", | |
1205 | sRef_unparse (fref)), | |
1206 | loc); | |
1207 | } | |
b7e84605 | 1208 | /* evans 2001-08-21: added this branch for global returns */ |
1209 | else if (transferType == TT_GLOBRETURN) | |
1210 | { | |
1211 | voptgenerror | |
1212 | (FLG_UNIONDEF, | |
1213 | message ("Union %q reachable from global %q has " | |
1214 | "no defined field", | |
1215 | sRef_unparse (fref), | |
1216 | sRef_unparse (sRef_getRootBase (fref))), | |
1217 | loc); | |
1218 | } | |
28bf4b0b | 1219 | else if (transferType == TT_DOASSIGN |
1220 | || transferType == TT_FIELDASSIGN | |
1221 | || transferType == TT_GLOBINIT) | |
1222 | { | |
1223 | ; /* no error */ | |
1224 | } | |
1225 | else | |
1226 | { | |
1227 | voptgenerror | |
1228 | (FLG_UNIONDEF, | |
1229 | message ("%s union %q has no defined field", | |
1230 | transferType_unparse (transferType), | |
1231 | sRef_unparse (fref)), | |
1232 | loc); | |
1233 | } | |
1234 | } | |
1235 | isOk = FALSE; | |
1236 | } | |
1237 | ||
1238 | cstringSList_free (goodFields); | |
1239 | return ynm_fromBool (!report || isOk); | |
1240 | } | |
1241 | } | |
1242 | } | |
1243 | else | |
1244 | { | |
1245 | ; | |
1246 | } | |
1247 | ||
1248 | return YES; | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | ** fref is being free'd | |
1253 | */ | |
1254 | ||
1255 | typedef enum { | |
1256 | DSC_GLOB, DSC_LOCAL, DSC_PARAM, DSC_STRUCT | |
1257 | } dscCode; | |
1258 | ||
1259 | static /*@observer@*/ cstring dscCode_unparse (dscCode desc) /*@*/ | |
1260 | { | |
1261 | switch (desc) | |
1262 | { | |
1263 | case DSC_GLOB: | |
1264 | return cstring_makeLiteralTemp ("killed global"); | |
1265 | case DSC_LOCAL: | |
1266 | return cstring_makeLiteralTemp ("variable declared in this scope"); | |
1267 | case DSC_PARAM: | |
1268 | return cstring_makeLiteralTemp ("released storage"); | |
1269 | case DSC_STRUCT: | |
1270 | return cstring_makeLiteralTemp ("released structure parameter"); | |
1271 | } | |
1272 | ||
1273 | BADEXIT; | |
1274 | } | |
1275 | ||
1276 | static bool | |
1277 | checkCompletelyDestroyed (exprNode p_fexp, sRef p_fref, bool p_topLevel, | |
1278 | fileloc p_loc, int p_depth, dscCode p_desc, | |
1279 | bool p_hideErrors); | |
1280 | ||
1281 | bool checkGlobalDestroyed (sRef fref, fileloc loc) | |
1282 | { | |
1283 | return (checkCompletelyDestroyed (exprNode_undefined, fref, TRUE, | |
1284 | loc, 0, DSC_GLOB, FALSE)); | |
1285 | } | |
1286 | ||
1287 | void checkLocalDestroyed (sRef fref, fileloc loc) | |
1288 | { | |
1289 | if (sRef_isObserver (fref) || sRef_isExposed (fref) | |
1290 | || sRef_isPartial (fref)) | |
1291 | { | |
1292 | ; | |
1293 | } | |
1294 | else | |
1295 | { | |
1296 | (void) checkCompletelyDestroyed (exprNode_undefined, fref, TRUE, | |
1297 | loc, 0, DSC_LOCAL, FALSE); | |
1298 | } | |
1299 | } | |
1300 | ||
1301 | void checkStructDestroyed (sRef fref, fileloc loc) | |
1302 | { | |
1303 | DPRINTF (("Check struct destroyed: %s", sRef_unparse (fref))); | |
1304 | ||
1305 | if (sRef_isObserver (fref) || sRef_isExposed (fref) | |
1306 | || sRef_isPartial (fref)) | |
1307 | { | |
1308 | DPRINTF (("Its exposed!"));; | |
1309 | } | |
1310 | else | |
1311 | { | |
1312 | (void) checkCompletelyDestroyed (exprNode_undefined, fref, TRUE, | |
1313 | loc, 0, DSC_STRUCT, FALSE); | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | static bool | |
1318 | checkCompletelyDestroyed (exprNode fexp, sRef fref, bool topLevel, | |
1319 | fileloc loc, int depth, | |
1320 | dscCode desc, bool hideErrors) | |
1321 | { | |
1322 | ctype ct; | |
1323 | ||
1324 | DPRINTF (("Check completely destroyed: %s", sRef_unparseFull (fref))); | |
1325 | ||
1326 | if (depth > MAXDEPTH) | |
1327 | { | |
1328 | llquietbug (message ("checkCompletelyDestroyed: too deep: %s / %q", | |
1329 | exprNode_unparse (fexp), | |
1330 | sRef_unparseFull (fref))); | |
1331 | return TRUE; | |
1332 | } | |
1333 | ||
1334 | if (!sRef_isKnown (fref)) return TRUE; | |
1335 | ||
1336 | /* evans 2001-03-24: added this. Definitely null values are always destroyed. */ | |
1337 | ||
1338 | if (sRef_isDefinitelyNull (fref)) | |
1339 | { | |
1340 | return TRUE; | |
1341 | } | |
1342 | ||
1343 | if (sRef_isDependent (fref) || sRef_isShared (fref) || sRef_isKept (fref)) | |
1344 | { | |
1345 | return TRUE; | |
1346 | } | |
1347 | ||
1348 | { | |
1349 | /* | |
1350 | ** evans 2001-03-24: if there is a dependent reference to this storage, | |
1351 | ** no need to destroy, but make it responsible. | |
1352 | */ | |
1353 | ||
1354 | sRef depRef = dependentReference (fref); | |
1355 | ||
1356 | DPRINTF (("Destroyed? %s / %s", | |
1357 | sRef_unparseFull (fref), | |
1358 | sRef_unparseFull (depRef))); | |
1359 | ||
1360 | DPRINTF (("Aliases: %s", usymtab_unparseAliases ())); | |
1361 | ||
1362 | if (sRef_isValid (depRef)) | |
1363 | { | |
1364 | /* | |
1365 | ** If the referenced storage was not dependent, we make | |
1366 | ** the reference the owner since it must eventually be | |
1367 | ** destroyed. | |
1368 | */ | |
1369 | ||
1370 | if (!sRef_isDependent (depRef)) | |
1371 | { | |
1372 | sRef_setOnly (depRef, loc); /* could be owned? */ | |
1373 | } | |
1374 | ||
1375 | sRef_kill (fref, loc); | |
1376 | return TRUE; | |
1377 | } | |
1378 | } | |
1379 | ||
1380 | if (sRef_isPdefined (fref) && !context_getFlag (FLG_STRICTDESTROY)) | |
1381 | { | |
1382 | DPRINTF (("Partial: %s", sRef_unparseFull (fref))); | |
1383 | hideErrors = TRUE; /* Don't report any more errors, but still change ownership. */ | |
1384 | } | |
1385 | ||
1386 | if (usymtab_isDefinitelyNull (fref)) | |
1387 | { | |
1388 | DPRINTF (("Probably null!")); | |
1389 | return TRUE; | |
1390 | } | |
1391 | ||
1392 | if (!context_getFlag (FLG_COMPDESTROY)) return TRUE; | |
1393 | if (!context_getFlag (FLG_MUSTFREE)) return TRUE; | |
1394 | ||
1395 | ct = ctype_realType (sRef_getType (fref)); | |
1396 | ||
1397 | DPRINTF (("Here: %s", ctype_unparse (ct))); | |
1398 | ||
1399 | if (!topLevel) | |
1400 | { | |
1401 | bool docheck = FALSE; | |
1402 | bool reportederror; | |
1403 | ||
1404 | if (sRef_isFresh (fref) || sRef_isOnly (fref)) | |
1405 | { | |
1406 | docheck = TRUE; | |
1407 | ||
1408 | DPRINTF (("Here: %s", ctype_unparse (ct))); | |
1409 | if (sRef_isDead (fref) | |
1410 | || sRef_isUnuseable (fref) | |
1411 | || sRef_definitelyNull (fref) | |
1412 | || sRef_isObserver (fref) | |
1413 | || sRef_isExposed (fref)) | |
1414 | { | |
1415 | docheck = FALSE; | |
1416 | } | |
1417 | } | |
1418 | ||
1419 | if (docheck) | |
1420 | { | |
1421 | if (sRef_isPossiblyDead (fref) || sRef_isRelDef (fref)) | |
1422 | { | |
1423 | if (exprNode_isDefined (fexp)) | |
1424 | { | |
1425 | reportederror = | |
1426 | !hideErrors | |
1427 | && | |
1428 | optgenerror2 | |
1429 | (FLG_COMPDESTROY, FLG_STRICTDESTROY, | |
1430 | message ("Only storage %q (type %s) derived from %s " | |
1431 | "may not have been released: %s", | |
1432 | sRef_unparse (fref), | |
1433 | ctype_unparse (sRef_getType (fref)), | |
1434 | dscCode_unparse (desc), | |
1435 | exprNode_unparse (fexp)), | |
1436 | loc); | |
1437 | } | |
1438 | else | |
1439 | { | |
1440 | reportederror = | |
1441 | !hideErrors | |
1442 | && | |
1443 | optgenerror2 | |
1444 | (FLG_COMPDESTROY, FLG_STRICTDESTROY, | |
1445 | message | |
1446 | ("Only storage %q (type %s) derived from %s " | |
1447 | "may not have been released", | |
1448 | sRef_unparse (fref), | |
1449 | ctype_unparse (sRef_getType (fref)), | |
1450 | dscCode_unparse (desc)), | |
1451 | loc); | |
1452 | } | |
1453 | ||
1454 | if (reportederror) | |
1455 | { | |
1456 | sRef_kill (fref, loc); /* prevent further errors */ | |
1457 | } | |
1458 | } | |
1459 | else | |
1460 | { | |
1461 | if (sRef_isStateUndefined (fref)) | |
1462 | { | |
1463 | DPRINTF (("Here: %s", ctype_unparse (ct))); | |
1464 | return TRUE; | |
1465 | } | |
1466 | else | |
1467 | { | |
1468 | if (exprNode_isDefined (fexp)) | |
1469 | { | |
1470 | DPRINTF (("Here: %s", sRef_unparseFull (fref))); | |
1471 | ||
1472 | reportederror = | |
1473 | !hideErrors | |
1474 | && | |
1475 | optgenerror | |
1476 | (FLG_COMPDESTROY, | |
1477 | message ("Only storage %q (type %s) derived from %s " | |
1478 | "is not released (memory leak): %s", | |
1479 | sRef_unparse (fref), | |
1480 | ctype_unparse (sRef_getType (fref)), | |
1481 | dscCode_unparse (desc), | |
1482 | exprNode_unparse (fexp)), | |
1483 | loc); | |
1484 | } | |
1485 | else | |
1486 | { | |
1487 | reportederror = | |
1488 | !hideErrors | |
1489 | && | |
1490 | optgenerror | |
1491 | (FLG_COMPDESTROY, | |
1492 | message ("Only storage %q (type %s) derived from %s " | |
1493 | "is not released (memory leak)", | |
1494 | sRef_unparse (fref), | |
1495 | ctype_unparse (sRef_getType (fref)), | |
1496 | dscCode_unparse (desc)), | |
1497 | loc); | |
1498 | } | |
1499 | ||
1500 | if (reportederror) | |
1501 | { | |
1502 | hideErrors = TRUE; | |
1503 | ||
1504 | /* sRef_kill (fref, loc); */ /* prevent further errors */ | |
1505 | DPRINTF (("Killed: %s", sRef_unparseFull (fref))); | |
1506 | } | |
1507 | } | |
1508 | } | |
1509 | ||
1510 | DPRINTF (("Here: %s", ctype_unparse (ct))); | |
1511 | return FALSE; | |
1512 | } | |
1513 | ||
1514 | if (/*! evs-2001-03-24 sRef_isAnyDefined (fref) || */ | |
1515 | sRef_isDead (fref) | |
1516 | || (sRef_isPdefined (fref) | |
1517 | && sRefSet_isEmpty (sRef_derivedFields (fref)))) | |
1518 | { | |
1519 | DPRINTF (("Here: %s [%s / %s]", | |
1520 | sRef_unparseFull (fref), | |
1521 | bool_unparse (sRef_isAnyDefined (fref)), | |
1522 | bool_unparse (sRef_isDead (fref)))); | |
1523 | return TRUE; | |
1524 | } | |
1525 | } | |
1526 | ||
1527 | DPRINTF (("Here...")); | |
1528 | ||
1529 | if (ctype_isPointer (ct)) | |
1530 | { | |
1531 | sRef fptr = sRef_constructDeadDeref (fref); | |
1532 | bool res; | |
1533 | ||
1534 | res = checkCompletelyDestroyed (fexp, fptr, FALSE, loc, | |
1535 | depth + 1, desc, hideErrors); | |
1536 | ||
1537 | return res; | |
1538 | } | |
1539 | else if (ctype_isArray (ct)) | |
1540 | { | |
1541 | if ((sRef_isStateUnknown (fref) || sRef_isAllocated (fref)) | |
1542 | && !sRef_hasDerived (fref)) | |
1543 | { | |
1544 | /* | |
1545 | ** Bogosity necessary to prevent infinite depth. | |
1546 | */ | |
1547 | ||
1548 | return FALSE; | |
1549 | } | |
1550 | else | |
1551 | { | |
1552 | sRef farr = sRef_constructDeadDeref (fref); | |
1553 | ||
1554 | return (checkCompletelyDestroyed (fexp, farr, FALSE, loc, | |
1555 | depth + 1, desc, hideErrors)); | |
1556 | } | |
1557 | } | |
1558 | else if (ctype_isStruct (ct)) | |
1559 | { | |
1560 | /* | |
1561 | ** for structures, each field must be completely destroyed | |
1562 | */ | |
1563 | ||
1564 | bool isOk = TRUE; | |
1565 | uentryList fields = ctype_getFields (ct); | |
1566 | ||
1567 | DPRINTF (("Struct fields: %s", uentryList_unparse (fields))); | |
1568 | ||
1569 | if (depth >= MAXDEPTH) | |
1570 | { | |
1571 | llquietbug (message ("checkCompletelyDestroyed (fields): too deep: %s / %q", | |
1572 | exprNode_unparse (fexp), | |
1573 | sRef_unparseFull (fref))); | |
1574 | ||
1575 | return TRUE; | |
1576 | } | |
1577 | else | |
1578 | { | |
1579 | uentryList_elements (fields, ue) | |
1580 | { | |
1581 | sRef field = sRef_makeField (fref, uentry_rawName (ue)); | |
1582 | ||
1583 | /* | |
1584 | ** note order of && operands --- want to report multiple errors | |
1585 | */ | |
1586 | ||
1587 | DPRINTF (("Check field: %s", sRef_unparseFull (field))); | |
1588 | ||
1589 | isOk = (checkCompletelyDestroyed (fexp, field, FALSE, loc, | |
1590 | depth + 1, desc, hideErrors) | |
1591 | && isOk); | |
1592 | } end_uentryList_elements; | |
1593 | } | |
1594 | ||
1595 | return isOk; | |
1596 | } | |
1597 | else | |
1598 | { | |
1599 | return TRUE; | |
1600 | } | |
1601 | } | |
1602 | ||
1603 | void | |
1604 | checkReturnTransfer (exprNode fexp, uentry rval) | |
1605 | { | |
1606 | sRef uref = uentry_getSref (rval); | |
1607 | sRef rref = sRef_makeNew (sRef_getType (uref), uref, cstring_undefined); | |
1608 | uentry fcn = context_getHeader (); | |
1609 | sRef fref = exprNode_getSref (fexp); | |
1610 | stateClauseList clauses = uentry_getStateClauseList (fcn); | |
1611 | ||
1612 | DPRINTF (("Check return: %s as %s = %s", | |
1613 | exprNode_unparse (fexp), | |
1614 | sRef_unparseFull (uref), | |
1615 | sRef_unparseFull (rref))); | |
1616 | ||
1617 | /* evans 2001-07-18: removed: if (sRef_isStateSpecial (rref)) */ | |
1618 | ||
1619 | DPRINTF (("Check state clauses: %s", | |
1620 | stateClauseList_unparse (clauses))); | |
1621 | ||
1622 | stateClauseList_postElements (clauses, cl) | |
1623 | { | |
1624 | if (stateClause_isGlobal (cl)) | |
1625 | { | |
1626 | ; /*@i32@*/ | |
1627 | } | |
1628 | else if (stateClause_setsMetaState (cl)) | |
1629 | { | |
1630 | sRefSet refs = stateClause_getRefs (cl); | |
1631 | qual ql = stateClause_getMetaQual (cl); | |
1632 | annotationInfo ainfo = qual_getAnnotationInfo (ql); | |
1633 | metaStateInfo minfo = annotationInfo_getState (ainfo); | |
1634 | cstring key = metaStateInfo_getName (minfo); | |
1635 | int mvalue = annotationInfo_getValue (ainfo); | |
1636 | ||
1637 | DPRINTF (("Return check: %s", stateClause_unparse (cl))); | |
1638 | ||
1639 | sRefSet_elements (refs, el) | |
1640 | { | |
1641 | sRef base = sRef_getRootBase (el); | |
1642 | ||
1643 | DPRINTF (("Sets meta state! %s", stateClause_unparse (cl))); | |
1644 | ||
1645 | if (sRef_isResult (base)) | |
1646 | { | |
1647 | sRef sr = sRef_fixBase (el, fref); | |
1648 | ||
1649 | if (!sRef_checkMetaStateValue (sr, key, mvalue)) | |
1650 | { | |
1651 | if (optgenerror | |
1652 | (FLG_STATETRANSFER, | |
1653 | message ("Result state %q does not satisfy ensures " | |
2c88d156 | 1654 | "clause: %q (state is %q, should be %s): %s", |
28bf4b0b | 1655 | sRef_unparse (sr), |
1656 | stateClause_unparse (cl), | |
1657 | stateValue_unparseValue (sRef_getMetaStateValue (sr, key), | |
1658 | minfo), | |
1659 | metaStateInfo_unparseValue (minfo, mvalue), | |
1660 | exprNode_unparse (fexp)), | |
1661 | exprNode_loc (fexp))) | |
1662 | { | |
1663 | sRef_showAliasInfo (sr); | |
1664 | /*@i32@*/ | |
1665 | } | |
1666 | } | |
1667 | } | |
1668 | else | |
1669 | { | |
1670 | /* | |
1671 | ** Non-results are checked in exit scope. | |
1672 | */ | |
1673 | } | |
1674 | } end_sRefSet_elements ; | |
1675 | } | |
1676 | else | |
1677 | { | |
1678 | sRefSet refs = stateClause_getRefs (cl); | |
1679 | sRefTest tst = stateClause_getPostTestFunction (cl); | |
1680 | sRefMod modf = stateClause_getReturnEffectFunction (cl); | |
1681 | ||
1682 | DPRINTF (("Clause: %s / %s", | |
1683 | stateClause_unparse (cl), | |
1684 | sRefSet_unparse (refs))); | |
1685 | ||
1686 | sRefSet_elements (refs, el) | |
1687 | { | |
1688 | sRef base = sRef_getRootBase (el); | |
1689 | ||
1690 | DPRINTF (("el: %s / %s", sRef_unparse (el), | |
1691 | sRef_unparse (base))); | |
1692 | ||
1693 | if (sRef_isResult (base)) | |
1694 | { | |
1695 | sRef sr = sRef_fixBase (el, fref); | |
1696 | ||
1697 | if (tst != NULL && !(tst (sr))) | |
1698 | { | |
1699 | if (optgenerror | |
1700 | (stateClause_postErrorCode (cl), | |
1701 | message ("%s storage %q corresponds to " | |
1702 | "storage %q listed in %q clause: %s", | |
1703 | stateClause_postErrorString (cl, sr), | |
1704 | sRef_unparse (sr), | |
1705 | sRef_unparse (el), | |
1706 | stateClause_unparseKind (cl), | |
1707 | exprNode_unparse (fexp)), | |
1708 | exprNode_loc (fexp))) | |
1709 | { | |
1710 | sRefShower ss = stateClause_getPostTestShower (cl); | |
1711 | ||
1712 | if (ss != NULL) | |
1713 | { | |
1714 | ss (sr); | |
1715 | } | |
1716 | } | |
1717 | } | |
1718 | ||
1719 | if (modf != NULL) | |
1720 | { | |
1721 | modf (sr, exprNode_loc (fexp)); | |
1722 | } | |
1723 | } | |
1724 | else | |
1725 | { | |
1726 | /* | |
1727 | ** Non-results are checked in exit scope. | |
1728 | */ | |
1729 | } | |
1730 | } end_sRefSet_elements ; | |
1731 | } | |
1732 | } end_stateClauseList_postElements ; | |
1733 | ||
1734 | if (ctype_isRealSU (exprNode_getType (fexp))) | |
1735 | { | |
1736 | sRef ffref = exprNode_getSref (fexp); | |
1737 | ||
1738 | checkStructTransfer (exprNode_undefined, rref, | |
1739 | fexp, ffref, | |
1740 | exprNode_loc (fexp), | |
1741 | TT_FCNRETURN); | |
1742 | } | |
1743 | else | |
1744 | { | |
1745 | (void) checkTransfer (fexp, exprNode_getSref (fexp), | |
1746 | exprNode_undefined, rref, | |
0bf5022d | 1747 | exprNode_undefined, |
28bf4b0b | 1748 | exprNode_loc (fexp), TT_FCNRETURN); |
1749 | } | |
1750 | } | |
1751 | ||
1752 | static void | |
1753 | checkPassstateClauseList (uentry ue, exprNode fexp, sRef fref, int argno) | |
1754 | { | |
1755 | stateClauseList clauses = uentry_getStateClauseList (ue); | |
1756 | ||
1757 | DPRINTF (("Check pass special: %s / %s", | |
1758 | exprNode_unparse (fexp), sRef_unparseFull (fref))); | |
1759 | ||
1760 | stateClauseList_preElements (clauses, cl) | |
1761 | { | |
1762 | if (stateClause_isGlobal (cl)) | |
1763 | { | |
1764 | ; | |
1765 | } | |
1766 | else | |
1767 | { | |
1768 | sRefSet refs = stateClause_getRefs (cl); | |
1769 | sRefTest tst = stateClause_getPreTestFunction (cl); | |
1770 | sRefMod modf = stateClause_getEffectFunction (cl); | |
1771 | ||
1772 | sRefSet_elements (refs, el) | |
1773 | { | |
1774 | sRef base = sRef_getRootBase (el); | |
1775 | ||
1776 | if (sRef_isResult (base)) | |
1777 | { | |
1778 | ; /* nothing to check before */ | |
1779 | } | |
1780 | else if (sRef_isParam (base)) | |
1781 | { | |
1782 | if (sRef_getParam (base) == argno - 1) | |
1783 | { | |
1784 | sRef sb; | |
1785 | ||
1786 | DPRINTF (("Fix base: %s / %s", | |
1787 | sRef_unparseFull (el), | |
1788 | sRef_unparseFull (fref))); | |
1789 | ||
1790 | sb = sRef_fixBase (el, fref); | |
1791 | ||
1792 | if (tst != NULL && !(tst(sb))) | |
1793 | { | |
1794 | voptgenerror | |
1795 | (stateClause_preErrorCode (cl), | |
1796 | message ("%s storage %qcorresponds to " | |
1797 | "storage listed in %q clause of " | |
1798 | "called function: %s", | |
1799 | stateClause_preErrorString (cl, sb), | |
1800 | sRef_unparseOpt (sb), | |
1801 | stateClause_unparseKind (cl), | |
1802 | exprNode_unparse (fexp)), | |
1803 | exprNode_loc (fexp)); | |
1804 | } | |
1805 | ||
1806 | if (modf != NULL) | |
1807 | { | |
1808 | DPRINTF (("Fixing: %s", sRef_unparseFull (sb))); | |
1809 | modf (sb, exprNode_loc (fexp)); | |
1810 | DPRINTF (("==> %s", sRef_unparseFull (sb))); | |
1811 | } | |
1812 | } | |
1813 | } | |
1814 | else | |
1815 | { | |
1816 | BADBRANCH; | |
1817 | } | |
1818 | } end_sRefSet_elements ; | |
1819 | } | |
1820 | } end_stateClauseList_preElements ; | |
1821 | ||
1822 | DPRINTF (("After: %s", sRef_unparseFull (fref))); | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | ** should not modify arg | |
1827 | */ | |
1828 | ||
1829 | void | |
1830 | checkPassTransfer (exprNode fexp, uentry arg, bool isSpec, | |
1831 | /*@dependent@*/ exprNode fcn, int argno, int totargs) | |
1832 | { | |
1833 | sRef tref = uentry_getSref (arg); | |
1834 | sRef fref = exprNode_getSref (fexp); | |
1835 | bool isOut = FALSE; | |
1836 | bool isPartial = FALSE; | |
1837 | bool isImpOut = FALSE; | |
1838 | ctype ct = uentry_getType (arg); | |
1839 | ||
1840 | DPRINTF (("Check pass: %s -> %s", | |
1841 | sRef_unparseFull (fref), | |
1842 | sRef_unparseFull (tref))); | |
1843 | ||
1844 | atFunction = fcn; | |
1845 | atArgNo = argno; | |
1846 | atNumArgs = totargs; | |
1847 | ||
1848 | if (ctype_isElips (ct)) | |
1849 | { | |
1850 | ct = ctype_unknown; | |
1851 | } | |
1852 | ||
1853 | DPRINTF (("Out arg: %s", bool_unparse (uentry_isOut (arg)))); | |
1854 | ||
1855 | if (!ctype_isElips (ct) && | |
1856 | (ctype_isVoidPointer (ct) && uentry_isOut (arg) && sRef_isOnly (tref))) | |
1857 | { | |
1858 | if (ctype_isRealAP (ct)) | |
1859 | { | |
1860 | if (sRef_aliasCheckSimplePred (sRef_isDead, fref)) | |
1861 | { | |
1862 | if (optgenerror | |
1863 | (FLG_USERELEASED, | |
1864 | message ("Dead storage %qpassed as out parameter to %s: %s", | |
1865 | sRef_unparseOpt (fref), | |
1866 | exprNode_unparse (fcn), | |
1867 | exprNode_unparse (fexp)), | |
1868 | exprNode_loc (fexp))) | |
1869 | { | |
1870 | if (sRef_isDead (fref)) | |
1871 | { | |
1872 | sRef_showStateInfo (fref); | |
1873 | } | |
1874 | else | |
1875 | { | |
1876 | DPRINTF (("Not really dead!")); | |
1877 | sRef_showStateInfo (fref); | |
1878 | } | |
1879 | } | |
1880 | ||
1881 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
1882 | } | |
1883 | else if (context_getFlag (FLG_STRICTUSERELEASED) | |
1884 | && sRef_aliasCheckSimplePred (sRef_isPossiblyDead, fref)) | |
1885 | { | |
1886 | if (optgenerror2 | |
1887 | (FLG_USERELEASED, FLG_STRICTUSERELEASED, | |
1888 | message ("Possibly dead storage %qpassed as out parameter: %s", | |
1889 | sRef_unparseOpt (fref), | |
1890 | exprNode_unparse (fexp)), | |
1891 | exprNode_loc (fexp))) | |
1892 | { | |
1893 | if (sRef_isPossiblyDead (fref)) | |
1894 | { | |
1895 | sRef_showStateInfo (fref); | |
1896 | } | |
1897 | } | |
1898 | ||
1899 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
1900 | } | |
1901 | else if (sRef_aliasCheckSimplePred (sRef_isStateUndefined, fref) | |
1902 | || sRef_aliasCheckSimplePred (sRef_isUnuseable, fref)) | |
1903 | { | |
1904 | voptgenerror | |
1905 | (FLG_USEDEF, | |
1906 | message ("Unallocated storage %qpassed as out parameter: %s", | |
1907 | sRef_unparseOpt (fref), | |
1908 | exprNode_unparse (fexp)), | |
1909 | exprNode_loc (fexp)); | |
1910 | ||
1911 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
1912 | } | |
1913 | else | |
1914 | { | |
1915 | ; | |
1916 | } | |
1917 | } | |
1918 | ||
1919 | (void) checkCompletelyDestroyed (fexp, fref, TRUE, exprNode_loc (fexp), | |
1920 | 0, DSC_PARAM, FALSE); | |
1921 | ||
1922 | /* make it defined now, so checkTransfer is okay */ | |
1923 | sRef_setDefined (fref, exprNode_loc (fexp)); | |
1924 | } | |
1925 | else if (uentry_isOut (arg)) | |
1926 | { | |
1927 | DPRINTF (("Here we are!")); | |
1928 | ||
1929 | if (ctype_isRealAP (ct) | |
1930 | && (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref))) | |
1931 | { | |
1932 | voptgenerror | |
1933 | (FLG_USEDEF, | |
1934 | message ("Unallocated storage %qpassed as out parameter to %s: %s", | |
1935 | sRef_unparseOpt (fref), | |
1936 | exprNode_unparse (fcn), | |
1937 | exprNode_unparse (fexp)), | |
1938 | exprNode_loc (fexp)); | |
1939 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
1940 | } | |
1941 | else if (sRef_isDead (fref)) | |
1942 | { | |
1943 | if (optgenerror | |
1944 | (FLG_USERELEASED, | |
1945 | message ("Dead storage %qpassed as out parameter to %s: %s", | |
1946 | sRef_unparseOpt (fref), | |
1947 | exprNode_unparse (fcn), | |
1948 | exprNode_unparse (fexp)), | |
1949 | exprNode_loc (fexp))) | |
1950 | { | |
1951 | sRef_showStateInfo (fref); | |
1952 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
1953 | } | |
1954 | } | |
1955 | else if (sRef_isPossiblyDead (fref)) | |
1956 | { | |
1957 | if (optgenerror2 | |
1958 | (FLG_USERELEASED, FLG_STRICTUSERELEASED, | |
1959 | message ("Possibly dead storage %qpassed as out parameter to %s: %s", | |
1960 | sRef_unparseOpt (fref), | |
1961 | exprNode_unparse (fcn), | |
1962 | exprNode_unparse (fexp)), | |
1963 | exprNode_loc (fexp))) | |
1964 | { | |
1965 | sRef_showStateInfo (fref); | |
1966 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
1967 | } | |
1968 | } | |
1969 | else | |
1970 | { | |
1971 | ; | |
1972 | } | |
1973 | ||
1974 | isOut = TRUE; | |
1975 | } | |
1976 | else if (uentry_isPartial (arg)) | |
1977 | { | |
1978 | if (ctype_isRealAP (ct) | |
1979 | && (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref))) | |
1980 | { | |
1981 | voptgenerror | |
1982 | (FLG_USEDEF, | |
1983 | message ("Unallocated storage %qpassed as partial parameter: %s", | |
1984 | sRef_unparseOpt (fref), | |
1985 | exprNode_unparse (fexp)), | |
1986 | exprNode_loc (fexp)); | |
1987 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
1988 | } | |
1989 | else if (sRef_isDead (fref)) | |
1990 | { | |
1991 | if (optgenerror | |
1992 | (FLG_USERELEASED, | |
1993 | message ("Dead storage %qpassed as partial parameter to %s: %s", | |
1994 | sRef_unparseOpt (fref), | |
1995 | exprNode_unparse (fcn), | |
1996 | exprNode_unparse (fexp)), | |
1997 | exprNode_loc (fexp))) | |
1998 | { | |
1999 | sRef_showStateInfo (fref); | |
2000 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
2001 | } | |
2002 | } | |
2003 | else if (sRef_isPossiblyDead (fref)) | |
2004 | { | |
2005 | if (optgenerror2 | |
2006 | (FLG_USERELEASED, FLG_STRICTUSERELEASED, | |
2007 | message ("Possibly dead storage %qpassed as partial parameter to %s: %s", | |
2008 | sRef_unparseOpt (fref), | |
2009 | exprNode_unparse (fcn), | |
2010 | exprNode_unparse (fexp)), | |
2011 | exprNode_loc (fexp))) | |
2012 | { | |
2013 | sRef_showStateInfo (fref); | |
2014 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
2015 | } | |
2016 | } | |
2017 | else | |
2018 | { | |
2019 | ; | |
2020 | } | |
2021 | ||
2022 | isPartial = TRUE; | |
2023 | } | |
2024 | else if (uentry_isStateSpecial (arg)) | |
2025 | { | |
2026 | uentry ue = exprNode_getUentry (fcn); | |
2027 | ||
2028 | if (ctype_isRealAP (ct) | |
2029 | && (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref))) | |
2030 | { | |
2031 | voptgenerror | |
2032 | (FLG_USEDEF, | |
2033 | message ("Unallocated storage %qpassed as special parameter: %s", | |
2034 | sRef_unparseOpt (fref), | |
2035 | exprNode_unparse (fexp)), | |
2036 | exprNode_loc (fexp)); | |
2037 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
2038 | } | |
2039 | else if (sRef_isDead (fref)) | |
2040 | { | |
2041 | if (optgenerror | |
2042 | (FLG_USERELEASED, | |
2043 | message ("Dead storage %qpassed as special parameter to %s: %s", | |
2044 | sRef_unparseOpt (fref), | |
2045 | exprNode_unparse (fcn), | |
2046 | exprNode_unparse (fexp)), | |
2047 | exprNode_loc (fexp))) | |
2048 | { | |
2049 | sRef_showStateInfo (fref); | |
2050 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
2051 | } | |
2052 | } | |
2053 | else if (sRef_isPossiblyDead (fref)) | |
2054 | { | |
2055 | if (optgenerror2 | |
2056 | (FLG_USERELEASED, FLG_STRICTUSERELEASED, | |
2057 | message ("Possibly dead storage %qpassed as special parameter to %s: %s", | |
2058 | sRef_unparseOpt (fref), | |
2059 | exprNode_unparse (fcn), | |
2060 | exprNode_unparse (fexp)), | |
2061 | exprNode_loc (fexp))) | |
2062 | { | |
2063 | sRef_showStateInfo (fref); | |
2064 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
2065 | } | |
2066 | } | |
2067 | else | |
2068 | { | |
2069 | ; | |
2070 | } | |
2071 | ||
2072 | if (uentry_hasStateClauseList (ue)) | |
2073 | { | |
2074 | checkPassstateClauseList (ue, fexp, fref, argno); | |
2075 | } | |
2076 | ||
2077 | return; /* ??? */ | |
2078 | } | |
2079 | else if (sRef_isStateDefined (tref)) | |
2080 | { | |
2081 | exprNode_checkUseParam (fexp); | |
2082 | } | |
2083 | else | |
2084 | { | |
2085 | if (isSpec || (!context_getFlag (FLG_IMPOUTS))) | |
2086 | { | |
2087 | exprNode_checkUseParam (fexp); | |
2088 | } | |
2089 | else | |
2090 | { | |
2091 | if (!sRef_isMacroParamRef (fref) | |
2092 | && (ctype_isRealAP (ct))) | |
2093 | { | |
2094 | if (sRef_isAddress (fref)) | |
2095 | { | |
2096 | if (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref)) | |
2097 | { | |
2098 | voptgenerror | |
2099 | (FLG_USEDEF, | |
2100 | message | |
2101 | ("Unallocated address %qpassed as implicit " | |
2102 | "out parameter: %s", | |
2103 | sRef_unparseOpt (fref), | |
2104 | exprNode_unparse (fexp)), | |
2105 | exprNode_loc (fexp)); | |
2106 | sRef_setAllocated (fref, exprNode_loc (fexp)); | |
2107 | } | |
2108 | } | |
2109 | ||
2110 | /* yes, I really mean this! */ | |
2111 | tref = sRef_copy (tref); | |
2112 | sRef_setAllocated (tref, exprNode_loc (fexp)); | |
2113 | ||
2114 | isOut = TRUE; | |
2115 | isImpOut = TRUE; | |
2116 | } | |
2117 | else | |
2118 | { | |
2119 | exprNode_checkUseParam (fexp); | |
2120 | } | |
2121 | } | |
2122 | } | |
2123 | ||
2124 | if (sRef_isNew (fref)) | |
2125 | { | |
2126 | alkind tkind = sRef_getAliasKind (tref); | |
2127 | ||
2128 | if ((sRef_isFresh (fref) || sRef_isOnly (fref)) | |
2129 | && !alkind_isOnly (tkind) | |
2130 | && !alkind_isKeep (tkind) | |
2131 | && !alkind_isOwned (tkind) | |
2132 | && !alkind_isError (tkind) | |
2133 | && !uentry_isReturned (arg)) | |
2134 | ||
2135 | { | |
2136 | voptgenerror | |
2137 | (FLG_MUSTFREE, | |
2138 | message ("New fresh storage %q(type %s) passed as %s (not released): %s", | |
2139 | sRef_unparseOpt (fref), | |
2140 | ctype_unparse (sRef_getType (fref)), | |
2141 | alkind_unparse (sRef_getAliasKind (tref)), | |
2142 | exprNode_unparse (fexp)), | |
2143 | exprNode_loc (fexp)); | |
2144 | DPRINTF (("Fresh: %s", sRef_unparseFull (fref))); | |
2145 | } | |
2146 | else | |
2147 | { | |
2148 | if (sRef_isNewRef (fref) && !sRef_isKillRef (tref)) | |
2149 | { | |
2150 | alkind ak = sRef_getAliasKind (tref); | |
2151 | ||
2152 | if (!alkind_isError (ak)) | |
2153 | { | |
2154 | voptgenerror | |
2155 | (FLG_MUSTFREE, | |
2156 | message ("New reference %q(type %s) passed as %s (not released): %s", | |
2157 | sRef_unparseOpt (fref), | |
2158 | ctype_unparse (sRef_getType (fref)), | |
2159 | alkind_unparse (sRef_getAliasKind (tref)), | |
2160 | exprNode_unparse (fexp)), | |
2161 | exprNode_loc (fexp)); | |
2162 | } | |
2163 | } | |
2164 | } | |
2165 | } | |
2166 | ||
2167 | (void) checkTransfer (fexp, exprNode_getSref (fexp), | |
2168 | exprNode_undefined, tref, | |
0bf5022d | 2169 | fcn, |
28bf4b0b | 2170 | exprNode_loc (fexp), TT_FCNPASS); |
2171 | ||
2172 | setCodePoint (); | |
2173 | fref = exprNode_getSref (fexp); | |
2174 | ||
2175 | if (isOut && !sRef_isDead (fref) && !sRef_isPossiblyDead (fref)) | |
2176 | { | |
2177 | sRef base; | |
2178 | ||
2179 | if (ctype_isRealAP (sRef_getType (fref))) | |
2180 | { | |
2181 | base = sRef_makePointer (fref); | |
2182 | } | |
2183 | else | |
2184 | { | |
2185 | base = fref; | |
2186 | } | |
2187 | ||
2188 | if (isImpOut) | |
2189 | { | |
2190 | exprNode_checkMSet (fexp, base); | |
2191 | } | |
2192 | else | |
2193 | { | |
2194 | exprNode_checkSet (fexp, base); | |
2195 | } | |
2196 | ||
2197 | if (sRef_isValid (base)) | |
2198 | { | |
2199 | setCodePoint (); | |
2200 | ||
2201 | sRef_clearDerived (base); | |
2202 | sRef_setDefined (base, exprNode_loc (fexp)); | |
2203 | usymtab_clearAlias (base); | |
2204 | sRef_setNullUnknown (base, exprNode_loc (fexp)); | |
2205 | } | |
2206 | } | |
2207 | ||
2208 | if (isPartial) | |
2209 | { | |
2210 | if (sRef_isValid (fref)) | |
2211 | { | |
2212 | sRef_setPartial (fref, exprNode_loc (fexp)); | |
2213 | } | |
2214 | } | |
2215 | ||
2216 | atFunction = exprNode_undefined; | |
2217 | atArgNo = 0; | |
2218 | atNumArgs = 0; | |
2219 | ||
2220 | /* need to fixup here: derived refs could be bogus */ | |
2221 | /* (better to change sRef to not add derivs for "protected" ref) */ | |
2222 | ||
2223 | uentry_fixupSref (arg); | |
2224 | ||
2225 | setCodePoint (); | |
2226 | ||
2227 | DPRINTF (("Check pass: ==> %s", | |
2228 | sRef_unparseFull (fref))); | |
2229 | } | |
2230 | ||
2231 | void | |
2232 | checkGlobReturn (uentry glob) | |
2233 | { | |
2234 | sRef_protectDerivs (); | |
2235 | checkGlobTrans (glob, TT_GLOBRETURN); | |
2236 | sRef_clearProtectDerivs (); | |
2237 | } | |
2238 | ||
2239 | void checkParamReturn (uentry actual) | |
2240 | { | |
2241 | checkLeaveTrans (actual, TT_PARAMRETURN); | |
2242 | } | |
2243 | ||
2244 | void checkLoseRef (uentry actual) | |
2245 | { | |
2246 | checkLeaveTrans (actual, TT_LEAVETRANS); | |
2247 | } | |
2248 | ||
2249 | static void | |
2250 | checkLeaveTrans (uentry actual, transferKind transferType) | |
2251 | { | |
2252 | sRef aref = uentry_getSref (actual); | |
2253 | sRef origref = uentry_getOrigSref (actual); | |
2254 | ||
2255 | if (transferType == TT_PARAMRETURN | |
2256 | && (sRef_isKeep (origref) || sRef_isOnly (origref) | |
2257 | || sRef_isOwned (origref))) | |
2258 | { | |
2259 | /* caller cannot use, nothing to check */ | |
2260 | } | |
2261 | else | |
2262 | { | |
2263 | if (sRef_isNSLocalVar (origref)) | |
2264 | { | |
2265 | ; | |
2266 | } | |
2267 | else | |
2268 | { | |
2269 | DPRINTF (("Leave trans: %s", uentry_unparseFull (actual))); | |
2270 | ||
2271 | (void) checkCompletelyDefined (exprNode_undefined, aref, aref, | |
2272 | exprNode_undefined, origref, | |
2273 | TRUE, FALSE, FALSE, | |
2274 | g_currentloc, transferType, | |
2275 | 0, TRUE); | |
2276 | } | |
2277 | } | |
2278 | } | |
2279 | ||
2280 | static void | |
2281 | checkGlobTrans (uentry glob, transferKind type) | |
2282 | { | |
2283 | sRef eref = uentry_getOrigSref (glob); | |
2284 | ||
2285 | (void) checkCompletelyDefined (exprNode_undefined, uentry_getSref (glob), uentry_getSref (glob), | |
2286 | exprNode_undefined, eref, | |
2287 | TRUE, FALSE, FALSE, | |
2288 | g_currentloc, type, 0, TRUE); | |
2289 | } | |
2290 | ||
2291 | /* | |
2292 | ** For lhs of assignment, alias kind is set from basic type. | |
2293 | ** Yoikes! | |
2294 | */ | |
2295 | ||
2296 | static void | |
2297 | fixAssignLhs (sRef s) | |
2298 | { | |
2299 | sRef_resetStateComplete (s); | |
2300 | } | |
2301 | ||
2302 | static void checkStructTransfer (exprNode lhs, sRef slhs, exprNode rhs, sRef srhs, | |
2303 | fileloc loc, | |
2304 | transferKind tt) | |
2305 | { | |
2306 | ctype st = ctype_realType (sRef_getType (srhs)); | |
2307 | ||
2308 | if (ctype_isSU (st) && ctype_isRealSU (sRef_getType (slhs)) | |
2309 | && ctype_match (sRef_getType (slhs), st)) | |
2310 | { | |
2311 | if (tt == TT_DOASSIGN && sRef_isStateDefined (srhs)) | |
2312 | { | |
2313 | sRef_setDefinedComplete (slhs, loc); | |
2314 | } | |
2315 | ||
2316 | if (sRef_isDependent (slhs) | |
2317 | || sRef_isObserver (slhs) | |
2318 | || sRef_isExposed (slhs)) | |
2319 | { | |
2320 | ; | |
2321 | } | |
2322 | else | |
2323 | { | |
2324 | if (sRef_isLocalVar (slhs) | |
2325 | && sRef_isFileOrGlobalScope (sRef_getRootBase (srhs))) | |
2326 | { | |
2327 | sRef_setDependent (slhs, exprNode_loc (lhs)); | |
2328 | } | |
2329 | else | |
2330 | { | |
2331 | if (ctype_isUnion (st)) | |
2332 | { | |
2333 | sRef_setDefState (slhs, sRef_getDefState (srhs), | |
2334 | exprNode_loc (lhs)); | |
2335 | ||
2336 | sRefSet_realElements (sRef_derivedFields (srhs), sr) | |
2337 | { | |
2338 | if (sRef_isField (sr)) | |
2339 | { | |
2340 | cstring fieldname = sRef_getField (sr); | |
2341 | sRef lfld = sRef_makeField (slhs, fieldname); | |
2342 | ||
2343 | (void) checkTransfer (rhs, sr, lhs, lfld, | |
0bf5022d | 2344 | exprNode_undefined, |
28bf4b0b | 2345 | exprNode_loc (lhs), tt); |
2346 | } | |
2347 | } end_sRefSet_realElements ; | |
2348 | } | |
2349 | else | |
2350 | { | |
2351 | uentryList fields = ctype_getFields (st); | |
2352 | ||
2353 | uentryList_elements (fields, field) | |
2354 | { | |
2355 | sRef rfld = sRef_makeField (srhs, uentry_rawName (field)); | |
2356 | sRef lfld = sRef_makeField (slhs, uentry_rawName (field)); | |
0bf5022d | 2357 | (void) checkTransfer (rhs, rfld, lhs, lfld, |
2358 | exprNode_undefined, | |
2359 | exprNode_loc (lhs), tt); | |
28bf4b0b | 2360 | } end_uentryList_elements ; |
2361 | } | |
2362 | ||
2363 | if (sRef_isOnly (srhs)) | |
2364 | { | |
2365 | sRef_setKeptComplete (srhs, loc); | |
2366 | } | |
2367 | } | |
2368 | } | |
2369 | } | |
2370 | } | |
2371 | ||
2372 | void | |
2373 | checkInitTransfer (exprNode lhs, exprNode rhs) | |
2374 | { | |
2375 | sRef slhs = exprNode_getSref (lhs); | |
2376 | ||
2377 | if (sRef_isFileOrGlobalScope (slhs) || (!sRef_isCvar (slhs))) | |
2378 | { | |
2379 | (void) checkTransfer (rhs, exprNode_getSref (rhs), | |
0bf5022d | 2380 | lhs, slhs, |
2381 | exprNode_undefined, | |
2382 | exprNode_loc (rhs), TT_GLOBINIT); | |
28bf4b0b | 2383 | } |
2384 | else | |
2385 | { | |
2386 | checkAssignTransfer (lhs, rhs); | |
2387 | } | |
2388 | } | |
2389 | ||
2390 | void | |
2391 | checkAssignTransfer (exprNode lhs, exprNode rhs) | |
2392 | { | |
2393 | sRef slhs = exprNode_getSref (lhs); | |
2394 | sRef srhs = exprNode_getSref (rhs); | |
2395 | sRef base = sRef_getBaseSafe (slhs); | |
2396 | nstate ns; | |
2397 | ||
2398 | DPRINTF (("Check assign: %s = %s", exprNode_unparse (lhs), | |
2399 | exprNode_unparse (rhs))); | |
2400 | DPRINTF (("lhs: %s", sRef_unparseFull (slhs))); | |
2401 | DPRINTF (("rhs: %s", sRef_unparseFull (srhs))); | |
2402 | ||
2403 | if (ctype_isRealSU (sRef_getType (srhs))) | |
2404 | { | |
2405 | checkStructTransfer (lhs, slhs, rhs, srhs, exprNode_loc (lhs), TT_FIELDASSIGN); | |
2406 | } | |
2407 | else | |
2408 | { | |
2409 | DPRINTF (("lhs: %s", sRef_unparseFull (slhs))); | |
2410 | DPRINTF (("rhs: %s", sRef_unparseFull (srhs))); | |
2411 | (void) checkTransfer (rhs, srhs, lhs, slhs, | |
0bf5022d | 2412 | exprNode_undefined, |
28bf4b0b | 2413 | exprNode_loc (lhs), TT_DOASSIGN); |
2414 | DPRINTF (("lhs: %s", sRef_unparseFull (slhs))); | |
2415 | DPRINTF (("rhs: %s", sRef_unparseFull (srhs))); | |
2416 | } | |
2417 | ||
2418 | if (sRef_isConst (srhs) && sRef_isLocalState (srhs)) | |
2419 | { | |
2420 | /* constants can match anything (e.g., NULL) */ | |
2421 | sRef_setAliasKind (slhs, AK_ERROR, fileloc_undefined); | |
2422 | } | |
2423 | ||
2424 | if (sRef_isValid (base) && sRef_isStateDefined (base)) | |
2425 | { | |
2426 | sRef_setPdefined (base, g_currentloc); | |
2427 | } | |
2428 | ||
2429 | if (sRef_isPartial (srhs)) | |
2430 | { | |
2431 | sRef_setPartial (slhs, exprNode_loc (rhs)); | |
2432 | } | |
2433 | ||
2434 | ns = sRef_getNullState (srhs); | |
2435 | ||
2436 | if (nstate_possiblyNull (ns)) | |
2437 | { | |
2438 | if (usymtab_isGuarded (srhs)) | |
2439 | { | |
2440 | ns = NS_NOTNULL; | |
2441 | } | |
2442 | } | |
2443 | ||
2444 | sRef_setNullStateInnerComplete (slhs, ns, exprNode_loc (rhs)); | |
2445 | ||
2446 | if (sRef_isExposed (srhs) || sRef_isObserver (srhs)) | |
2447 | { | |
2448 | sRef_setExKind (slhs, sRef_getExKind (srhs), exprNode_loc (rhs)); | |
2449 | } | |
2450 | ||
2451 | DPRINTF (("Done transfer: %s", sRef_unparseFull (slhs))); | |
2452 | } | |
2453 | ||
2454 | static void | |
2455 | checkTransferNullAux (sRef fref, exprNode fexp, /*@unused@*/ bool ffix, | |
2456 | sRef tref, exprNode texp, /*@unused@*/ bool tfix, | |
2457 | fileloc loc, transferKind transferType) | |
2458 | { | |
2459 | alkind tkind = sRef_getAliasKind (tref); | |
2460 | ctype ttyp = ctype_realType (sRef_getType (tref)); | |
2461 | ||
2462 | if (ctype_isUnknown (ttyp)) | |
2463 | { | |
2464 | ttyp = exprNode_getType (texp); | |
2465 | ||
2466 | if (ctype_isUnknown (ttyp)) | |
2467 | { | |
2468 | ttyp = exprNode_getType (fexp); | |
2469 | ||
2470 | if (ctype_isUnknown (ttyp)) | |
2471 | { | |
2472 | ttyp = sRef_getType (fref); | |
2473 | } | |
2474 | } | |
2475 | } | |
2476 | ||
2477 | if (ctype_isFunction (ttyp) && (transferType == TT_FCNRETURN)) | |
2478 | { | |
2479 | ttyp = ctype_getReturnType (ttyp); | |
2480 | } | |
2481 | ||
2482 | /* | |
2483 | ** check for null (don't need to check aliases??) | |
2484 | */ | |
2485 | ||
2486 | if (sRef_possiblyNull (fref) | |
2487 | && !usymtab_isGuarded (fref) | |
2488 | && ctype_isRealAP (ttyp)) | |
2489 | { | |
2490 | if (!alkind_isLocal (tkind) && !alkind_isFresh (tkind) | |
2491 | && !sRef_perhapsNull (tref) | |
2492 | && !(transferType == TT_DOASSIGN)) | |
2493 | { | |
2494 | if (transferType == TT_GLOBINIT) | |
2495 | { | |
2496 | if (sRef_isNotNull (tref)) | |
2497 | { | |
2498 | if (optgenerror | |
2499 | (FLG_SYNTAX, /*@i432 kuldge flag... */ | |
2500 | message ("%s %q initialized to %s value: %q", | |
2501 | sRef_getScopeName (tref), | |
2502 | sRef_unparse (tref), | |
2503 | sRef_nullMessage (fref), | |
2504 | generateText (fexp, texp, tref, transferType)), | |
2505 | loc)) | |
2506 | { | |
2507 | sRef_showNullInfo (fref); | |
2508 | sRef_setNullError (tref); | |
2509 | } | |
2510 | } | |
2511 | else | |
2512 | { | |
2513 | if (optgenerror | |
2514 | (FLG_NULLASSIGN, | |
2515 | message ("%s %q initialized to %s value: %q", | |
2516 | sRef_getScopeName (tref), | |
2517 | sRef_unparse (tref), | |
2518 | sRef_nullMessage (fref), | |
2519 | generateText (fexp, texp, tref, transferType)), | |
2520 | loc)) | |
2521 | { | |
2522 | sRef_showNullInfo (fref); | |
2523 | sRef_setNullError (tref); | |
2524 | } | |
2525 | } | |
2526 | } | |
2527 | else | |
2528 | { | |
2529 | if (optgenerror | |
2530 | ((transferType == TT_FCNPASS) ? FLG_NULLPASS : FLG_NULLRET, | |
2531 | message ("%q storage %q%s: %q", | |
2532 | cstring_capitalize (sRef_nullMessage (fref)), | |
2533 | sRef_unparseOpt (fref), | |
2534 | transferNullMessage (transferType), | |
2535 | generateText (fexp, texp, tref, transferType)), | |
2536 | loc)) | |
2537 | { | |
2538 | sRef_showNullInfo (fref); | |
2539 | sRef_setNullError (fref); | |
2540 | } | |
2541 | } | |
2542 | } | |
2543 | else | |
2544 | { | |
2545 | ; | |
2546 | } | |
2547 | } | |
2548 | } | |
2549 | ||
2550 | ||
2551 | static void | |
2552 | checkTransferAssignAux (sRef fref, exprNode fexp, /*@unused@*/ bool ffix, | |
2553 | /*@exposed@*/ sRef tref, exprNode texp, bool tfix, | |
2554 | fileloc loc, transferKind transferType) | |
2555 | { | |
2556 | alkind tkind = sRef_getAliasKind (tref); | |
2557 | ||
2558 | /* | |
2559 | ** Assignment to same --- no errors, or state changes. | |
2560 | ** This can happen when returned params are used. | |
2561 | */ | |
2562 | ||
2563 | if (sRef_sameName (fref, tref)) | |
2564 | { | |
2565 | sRef_copyState (tref, fref); | |
2566 | return; | |
2567 | } | |
2568 | ||
2569 | if ((alkind_isOnly (tkind) || alkind_isFresh (tkind) | |
2570 | || alkind_isNewRef (tkind) || alkind_isOwned (tkind)) | |
2571 | && !(sRef_isDead (tref) | |
2572 | || sRef_isStateUndefined (tref) | |
2573 | || sRef_isUnuseable (tref) | |
2574 | || sRef_isPartial (tref) | |
2575 | || sRef_definitelyNull (tref) | |
2576 | || sRef_isStackAllocated (tref) | |
2577 | || sRef_isAllocIndexRef (tref)) | |
2578 | && !(sRef_same (fref, tref)) /* okay to assign to self (returned params) */ | |
2579 | && !(usymtab_isDefinitelyNull (tref))) | |
2580 | { | |
2581 | if (context_getFlag (FLG_MUSTFREE)) | |
2582 | { | |
2583 | if (canLoseReference (tref, loc)) | |
2584 | { | |
2585 | ; /* no error */ | |
2586 | } | |
2587 | else | |
2588 | { | |
2589 | if (sRef_hasLastReference (tref)) | |
2590 | { | |
2591 | if (optgenerror | |
2592 | (FLG_MUSTFREE, | |
2593 | message ("Last reference %q to %s storage %q(type %s) not released " | |
2594 | "before assignment: %q", | |
2595 | sRef_unparse (tref), | |
2596 | alkind_unparse (tkind), | |
2597 | sRef_unparseOpt (sRef_getAliasInfoRef (tref)), | |
2598 | ctype_unparse (sRef_getType (tref)), | |
2599 | generateText (fexp, texp, tref, transferType)), | |
2600 | loc)) | |
2601 | { | |
2602 | sRef_showRefLost (tref); | |
2603 | } | |
2604 | } | |
2605 | else | |
2606 | { | |
2607 | if (context_inGlobalScope ()) | |
2608 | { | |
2609 | /* no errors for static initializations */ | |
2610 | } | |
2611 | else | |
2612 | { | |
2613 | /* | |
2614 | ** don't report this error for a[i], since it could | |
2615 | ** be a new element. | |
2616 | */ | |
2617 | ||
2618 | if (alkind_isNewRef (tkind)) | |
2619 | { | |
2620 | if (optgenerror | |
2621 | (FLG_MUSTFREE, | |
2622 | message | |
2623 | ("%q %q(type %s) not released before assignment: %q", | |
2624 | cstring_makeLiteral | |
2625 | (alkind_isKillRef (sRef_getOrigAliasKind (tref)) | |
2626 | ? "Kill reference parameter" : "New reference"), | |
2627 | sRef_unparseOpt (tref), | |
2628 | ctype_unparse (sRef_getType (tref)), | |
2629 | generateText (fexp, texp, tref, transferType)), | |
2630 | loc)) | |
2631 | { | |
2632 | sRef_showAliasInfo (tref); | |
2633 | sRef_setAliasKind (tref, AK_ERROR, loc); | |
2634 | } | |
2635 | } | |
2636 | else if | |
2637 | (!(sRef_isUnknownArrayFetch (tref) | |
2638 | && !context_getFlag (FLG_STRICTDESTROY)) | |
2639 | && !sRef_isUnionField (tref) | |
2640 | && !sRef_isRelDef (tref) | |
2641 | && optgenerror | |
2642 | (FLG_MUSTFREE, | |
2643 | message | |
2644 | ("%s storage %q(type %s) not released before assignment: %q", | |
2645 | alkind_capName (tkind), | |
2646 | sRef_unparseOpt (tref), | |
2647 | ctype_unparse (sRef_getType (tref)), | |
2648 | generateText (fexp, texp, tref, transferType)), | |
2649 | loc)) | |
2650 | { | |
2651 | sRef_showAliasInfo (tref); | |
2652 | } | |
2653 | else | |
2654 | { | |
2655 | ; | |
2656 | } | |
2657 | } | |
2658 | } | |
2659 | } | |
2660 | } | |
2661 | } | |
2662 | ||
2663 | fixAssignLhs (tref); | |
2664 | ||
2665 | if (sRef_isRefCounted (tref)) /* tkind might not be correct now */ | |
2666 | { | |
2667 | if (sRef_isNewRef (fref)) | |
2668 | { | |
2669 | sRef_setAliasKind (tref, AK_NEWREF, loc); | |
2670 | } | |
2671 | else if (sRef_isConst (fref)) | |
2672 | { | |
2673 | /* for now, constants are not ref counted */ | |
2674 | sRef_setAliasKind (tref, AK_ERROR, loc); | |
2675 | } | |
2676 | else | |
2677 | { | |
2678 | ; | |
2679 | } | |
2680 | ||
2681 | if (!sRef_isNSLocalVar (tref) | |
2682 | && sRef_isRefCounted (fref) | |
2683 | && sRef_isStateDefined (fref)) | |
2684 | { | |
2685 | voptgenerror | |
2686 | (FLG_NEWREFTRANS, | |
2687 | message ("New reference %qto reference counted storage: %q", | |
2688 | sRef_unparseOpt (tref), | |
2689 | generateText (fexp, texp, tref, transferType)), | |
2690 | loc); | |
2691 | } | |
2692 | } | |
2693 | ||
2694 | /* | |
2695 | ** Not for structures and unions, since assignments copy. | |
2696 | */ | |
2697 | ||
2698 | if (sRef_isStack (fref) | |
2699 | && !ctype_isSU (ctype_realType (sRef_getType (fref)))) | |
2700 | { | |
2701 | sRef_setAliasKindComplete (tref, AK_STACK, loc); | |
2702 | } | |
2703 | ||
2704 | if (sRef_isNSLocalVar (tref) | |
2705 | && !sRef_isOwned (tref) /*< should only apply to static >*/ | |
2706 | && ctype_isMutable (sRef_getType (tref))) | |
2707 | { | |
2708 | if (sRef_isOnly (fref) && sRef_isNew (fref)) | |
2709 | { | |
2710 | if (!tfix) | |
2711 | { | |
2712 | sRef_setFresh (tref, loc); | |
2713 | } | |
2714 | } | |
2715 | } | |
2716 | } | |
2717 | ||
2718 | /* | |
2719 | ** requires sRef_isOnly (fref) | |
2720 | */ | |
2721 | ||
2722 | static void | |
2723 | checkOnlyTransferAux (sRef fref, exprNode fexp, bool ffix, | |
2724 | sRef tref, exprNode texp, /*@unused@*/ bool tfix, | |
2725 | fileloc loc, transferKind transferType) | |
2726 | { | |
2727 | alkind tkind = sRef_getAliasKind (tref); | |
2728 | ||
2729 | if (sRef_isExposed (tref) || sRef_isObserver (tref)) | |
2730 | { | |
2731 | if (transferType == TT_FCNRETURN && sRef_isNew (fref) | |
2732 | && !alkind_isError (tkind)) | |
2733 | { | |
2734 | if (optgenerror | |
2735 | (FLG_ONLYTRANS, | |
2736 | message ("Only storage %q%q (will not be released): %q", | |
2737 | sRef_unparseOpt (fref), | |
2738 | transferErrorMessage (transferType, tkind), | |
2739 | generateText (fexp, texp, tref, transferType)), | |
2740 | loc)) | |
2741 | { | |
2742 | sRef_showAliasInfo (fref); | |
2743 | } | |
2744 | } | |
2745 | ||
2746 | /* no errors for exposed transfers (is this good enough?) */ | |
2747 | } | |
2748 | else if (alkind_isOnly (tkind) || alkind_isKeep (tkind) || alkind_isOwned (tkind)) | |
2749 | { | |
2750 | ; /* okay */ | |
2751 | } | |
2752 | else if ((transferType == TT_FCNPASS) | |
2753 | && (alkind_isUnknown (tkind) | |
2754 | || alkind_isTemp (tkind) || alkind_isUnique (tkind))) | |
2755 | { | |
2756 | if (sRef_isFresh (fref) | |
2757 | && alkind_isUnknown (tkind) && !context_getFlag (FLG_PASSUNKNOWN)) | |
2758 | { | |
2759 | if (!ffix) sRef_setAliasKind (fref, AK_UNKNOWN, loc); | |
2760 | } | |
2761 | } | |
2762 | else if (alkind_isLocal (tkind) | |
2763 | || alkind_isFresh (tkind) || alkind_isUnknown (tkind)) | |
2764 | { | |
2765 | if ((transferType == TT_DOASSIGN) | |
2766 | && sRef_isNew (fref) | |
2767 | && sRef_isOnly (fref)) | |
2768 | { | |
2769 | bool error = FALSE; | |
2770 | ||
2771 | if (alkind_isUnknown (tkind) | |
2772 | && sRef_isFileOrGlobalScope (sRef_getRootBase (tref))) | |
2773 | { | |
2774 | if (optgenerror | |
2775 | (FLG_ONLYUNQGLOBALTRANS, | |
2776 | message ("Only storage %q%q: %q", | |
2777 | sRef_unparseOpt (fref), | |
2778 | transferErrorMessage (transferType, tkind), | |
2779 | generateText (fexp, texp, tref, transferType)), | |
2780 | loc)) | |
2781 | { | |
2782 | sRef_showAliasInfo (fref); | |
2783 | sRef_setAliasKind (tref, AK_ERROR, loc); | |
2784 | error = TRUE; | |
2785 | } | |
2786 | } | |
2787 | ||
2788 | if (!error && !ffix) | |
2789 | { | |
2790 | sRef_setFresh (tref, loc); | |
2791 | } | |
2792 | } | |
2793 | else | |
2794 | { | |
2795 | if (alkind_isLocal (tkind)) | |
2796 | { | |
2797 | if (sRef_sameName (tref, fref)) | |
2798 | { | |
2799 | ; /* don't set this --- corresponds to return transfer */ | |
2800 | } | |
2801 | else | |
2802 | { | |
2803 | /* | |
2804 | ** Don't set local to dependent. Error will | |
2805 | ** be detected through aliasing. Except for | |
2806 | ** arrays. | |
2807 | */ | |
2808 | ||
2809 | if (!tfix && sRef_isThroughArrayFetch (fref) | |
2810 | && context_getFlag (FLG_DEPARRAYS)) | |
2811 | { | |
2812 | sRef_setDependent (tref, loc); | |
2813 | } | |
2814 | } | |
2815 | } | |
2816 | else | |
2817 | { | |
2818 | if (optgenerror | |
2819 | (FLG_ONLYTRANS, | |
2820 | message ("Only storage %q%q: %q", | |
2821 | sRef_unparseOpt (fref), | |
2822 | transferErrorMessage (transferType, tkind), | |
2823 | generateText (fexp, texp, tref, transferType)), | |
2824 | loc)) | |
2825 | { | |
2826 | sRef_showAliasInfo (fref); | |
2827 | } | |
2828 | } | |
2829 | } | |
2830 | } | |
2831 | else | |
2832 | { | |
2833 | if (alkind_isError (tkind) | |
2834 | || (alkind_isUnknown (tkind) && !context_getFlag (FLG_MEMIMPLICIT))) | |
2835 | { | |
2836 | flagcode_recordSuppressed (FLG_ONLYTRANS); | |
2837 | } | |
2838 | else | |
2839 | { | |
2840 | if ((alkind_isKept (tkind) || alkind_isStack (tkind) | |
2841 | || alkind_isDependent (tkind)) | |
2842 | && sRef_isNSLocalVar (tref)) | |
2843 | { | |
2844 | ; /* okay */ | |
2845 | } | |
2846 | else | |
2847 | { | |
2848 | if (optgenerror | |
2849 | (FLG_ONLYTRANS, | |
2850 | message ("Only storage %q%q: %q", | |
2851 | sRef_unparseOpt (fref), | |
2852 | transferErrorMessage (transferType, tkind), | |
2853 | generateText (fexp, texp, tref, transferType)), | |
2854 | loc)) | |
2855 | { | |
2856 | sRef_showAliasInfo (fref); | |
2857 | ||
2858 | if (transferType == TT_DOASSIGN) | |
2859 | { | |
2860 | /* | |
2861 | ** alias kind unknown to suppress future messages | |
2862 | */ | |
2863 | ||
2864 | if (!ffix && sRef_isNSLocalVar (sRef_getRootBase (fref))) | |
2865 | { | |
2866 | sRef_clearAliasKind (fref); | |
2867 | } | |
2868 | } | |
2869 | } | |
2870 | } | |
2871 | } | |
2872 | } | |
2873 | } | |
2874 | ||
2875 | /* | |
2876 | ** ??? same as checkOnly ? | |
2877 | */ | |
2878 | ||
2879 | static void | |
2880 | checkOwnedTransferAux (sRef fref, exprNode fexp, bool ffix, | |
2881 | sRef tref, exprNode texp, bool tfix, | |
2882 | fileloc loc, transferKind transferType) | |
2883 | { | |
2884 | alkind tkind = sRef_getAliasKind (tref); | |
2885 | ||
2886 | if (sRef_isExposed (tref) || sRef_isObserver (tref)) | |
2887 | { | |
2888 | if (transferType == TT_FCNRETURN && sRef_isNew (fref)) | |
2889 | { | |
2890 | if (optgenerror | |
2891 | (FLG_OWNEDTRANS, | |
2892 | message ("Owned storage %q%q (will not be released): %q", | |
2893 | sRef_unparseOpt (fref), | |
2894 | transferErrorMessage (transferType, tkind), | |
2895 | generateText (fexp, texp, tref, transferType)), | |
2896 | loc)) | |
2897 | { | |
2898 | sRef_showAliasInfo (fref); | |
2899 | } | |
2900 | } | |
2901 | } | |
2902 | else if (alkind_isOnly (tkind) || alkind_isKeep (tkind) | |
2903 | || alkind_isDependent (tkind) | |
2904 | || alkind_isOwned (tkind)) | |
2905 | { | |
2906 | /* okay */ | |
2907 | } | |
2908 | else if (alkind_isLocal (tkind) | |
2909 | || alkind_isFresh (tkind) || alkind_isUnknown (tkind)) | |
2910 | { | |
2911 | if ((transferType == TT_DOASSIGN) | |
2912 | && sRef_isNew (fref) && sRef_isOnly (fref)) | |
2913 | { | |
2914 | if (!tfix) | |
2915 | { | |
2916 | sRef_setFresh (tref, loc); | |
2917 | } | |
2918 | } | |
2919 | else | |
2920 | { | |
2921 | } | |
2922 | } | |
2923 | else if ((transferType == TT_FCNPASS) | |
2924 | && (alkind_isUnknown (tkind) | |
2925 | || alkind_isTemp (tkind) || alkind_isUnique (tkind))) | |
2926 | { | |
2927 | if (sRef_isFresh (fref) | |
2928 | && alkind_isUnknown (tkind) && !context_getFlag (FLG_PASSUNKNOWN)) | |
2929 | { | |
2930 | if (!ffix) { sRef_clearAliasKind (fref); } | |
2931 | } | |
2932 | } | |
2933 | else | |
2934 | { | |
2935 | if (alkind_isUnknown (tkind) && !context_getFlag (FLG_MEMIMPLICIT)) | |
2936 | { | |
2937 | flagcode_recordSuppressed (FLG_OWNEDTRANS); | |
2938 | } | |
2939 | else | |
2940 | { | |
2941 | if (alkind_isKept (tkind) && sRef_isNSLocalVar (tref)) | |
2942 | { | |
2943 | ; /* okay */ | |
2944 | } | |
2945 | else | |
2946 | { | |
2947 | voptgenerror | |
2948 | (FLG_OWNEDTRANS, | |
2949 | message ("Owned storage %q%q: %q", | |
2950 | sRef_unparseOpt (fref), | |
2951 | transferErrorMessage (transferType, tkind), | |
2952 | generateText (fexp, texp, tref, transferType)), | |
2953 | loc); | |
2954 | } | |
2955 | } | |
2956 | ||
2957 | if (transferType == TT_DOASSIGN) | |
2958 | { | |
2959 | /* | |
2960 | ** alias kind unknown to suppress future messages | |
2961 | */ | |
2962 | ||
2963 | if (!ffix) { sRef_clearAliasKind (fref); } | |
2964 | } | |
2965 | } | |
2966 | } | |
2967 | ||
2968 | static void | |
2969 | checkFreshTransferAux (sRef fref, exprNode fexp, bool ffix, | |
2970 | sRef tref, exprNode texp, /*@unused@*/ bool tfix, | |
2971 | fileloc loc, transferKind transferType) | |
2972 | { | |
2973 | alkind tkind = sRef_getAliasKind (tref); | |
2974 | ||
2975 | /* | |
2976 | ** error to return fresh as non-only | |
2977 | */ | |
2978 | ||
2979 | if (transferType == TT_FCNRETURN | |
2980 | && !(alkind_isOnly (tkind) || alkind_isNewRef (tkind))) | |
2981 | { | |
2982 | if (alkind_isUnknown (tkind) && !context_getFlag (FLG_MEMIMPLICIT)) | |
2983 | { | |
2984 | flagcode_recordSuppressed (FLG_NEWREFTRANS); | |
2985 | } | |
2986 | else | |
2987 | { | |
2988 | if (alkind_isError (tkind)) | |
2989 | { | |
2990 | if (!ffix) | |
2991 | { | |
2992 | sRef_killComplete (fref, loc); | |
2993 | } | |
2994 | } | |
2995 | else if (alkind_isRefCounted (tkind)) | |
2996 | { | |
2997 | if (optgenerror | |
2998 | (FLG_NEWREFTRANS, | |
2999 | message | |
3000 | ("New reference returned without newref qualifier: %q", | |
3001 | generateText (fexp, texp, tref, transferType)), | |
3002 | loc)) | |
3003 | { | |
3004 | sRef_showAliasInfo (fref); | |
3005 | sRef_killComplete (fref, loc); | |
3006 | } | |
3007 | } | |
3008 | else | |
3009 | { | |
3010 | if (optgenerror | |
3011 | (FLG_FRESHTRANS, | |
3012 | message ("Fresh storage %q (should be only): %q", | |
3013 | transferErrorMessage (transferType, tkind), | |
3014 | generateText (fexp, texp, tref, transferType)), | |
3015 | loc)) | |
3016 | { | |
3017 | sRef_showAliasInfo (fref); | |
3018 | sRef_killComplete (fref, loc); | |
3019 | } | |
3020 | } | |
3021 | } | |
3022 | } | |
3023 | ||
3024 | /* | |
3025 | ** Okay to assign fresh to only, shared or unqualified. | |
3026 | ** | |
3027 | ** should generate other errors? | |
3028 | */ | |
3029 | ||
3030 | if (alkind_isOnly (tkind)) | |
3031 | { | |
3032 | if (transferType == TT_DOASSIGN && !sRef_isFileOrGlobalScope (tref)) | |
3033 | { | |
3034 | if (!ffix) | |
3035 | { | |
3036 | if (!sRef_isNSLocalVar (tref)) | |
3037 | { | |
3038 | sRef_setKeptComplete (fref, loc); | |
3039 | } | |
3040 | } | |
3041 | } | |
3042 | else | |
3043 | { | |
3044 | if (sRef_isConst (fref)) | |
3045 | { | |
3046 | ; | |
3047 | } | |
3048 | else | |
3049 | { | |
3050 | if (!ffix) | |
3051 | { | |
3052 | sRef_killComplete (fref, loc); | |
3053 | } | |
3054 | } | |
3055 | } | |
3056 | } | |
3057 | else if (alkind_isOwned (tkind)) | |
3058 | { | |
3059 | if (!ffix) | |
3060 | { | |
3061 | sRef_setDependentComplete (fref, loc); | |
3062 | } | |
3063 | } | |
3064 | else if (alkind_isRefCounted (tkind) | |
3065 | && (transferType == TT_FCNRETURN) && sRef_isFresh (fref)) | |
3066 | { | |
3067 | if (!ffix) | |
3068 | { | |
3069 | sRef_killComplete (fref, loc); | |
3070 | } | |
3071 | } | |
3072 | else if (alkind_isKeep (tkind)) | |
3073 | { | |
3074 | if (!ffix) | |
3075 | { | |
3076 | if (!sRef_isNSLocalVar (tref)) | |
3077 | { | |
3078 | sRef_setKeptComplete (fref, loc); | |
3079 | } | |
3080 | } | |
3081 | } | |
3082 | else if (alkind_isShared (tkind)) | |
3083 | { | |
3084 | if (!ffix) { sRef_setShared (fref, loc); } | |
3085 | } | |
3086 | else if (alkind_isLocal (tkind) || alkind_isUnknown (tkind)) | |
3087 | { | |
3088 | if (transferType == TT_DOASSIGN || transferType == TT_FCNRETURN) | |
3089 | { | |
3090 | /* | |
3091 | ** local shares fresh. Make it owned/dependent. | |
3092 | */ | |
3093 | ||
3094 | if (!tfix) | |
3095 | { | |
3096 | sRef_setOwned (tref, loc); | |
3097 | } | |
3098 | ||
3099 | if (!ffix && !tfix) | |
3100 | { | |
3101 | sRef_setDependentComplete (fref, loc); | |
3102 | } | |
3103 | ||
3104 | /* NO! sRef_clearAliasKind (fref); */ | |
3105 | } | |
3106 | else | |
3107 | { | |
3108 | if (context_getFlag (FLG_PASSUNKNOWN)) | |
3109 | { | |
3110 | sRef_clearAliasKind (fref); | |
3111 | } | |
3112 | } | |
3113 | } | |
3114 | else | |
3115 | { | |
3116 | ; | |
3117 | } | |
3118 | } | |
3119 | ||
3120 | static void | |
3121 | checkTransferExposure (sRef fref, exprNode fexp, /*@unused@*/ bool ffix, | |
3122 | sRef tref, exprNode texp, bool tfix, | |
3123 | fileloc loc, | |
3124 | transferKind transferType) | |
3125 | { | |
3126 | alkind fkind = sRef_getAliasKind (fref); | |
3127 | alkind tkind = sRef_getAliasKind (tref); | |
3128 | exkind tekind = sRef_getExKind (tref); | |
3129 | ||
3130 | if (sRef_isObserver (fref) && ctype_isMutable (sRef_getType (fref))) | |
3131 | { | |
3132 | /* | |
3133 | ** observer -> exposed or observer | |
3134 | */ | |
3135 | ||
3136 | /* | |
3137 | ** observer -> temp is okay [NO! really? only in function calls] | |
3138 | */ | |
3139 | ||
3140 | if (sRef_isExposed (tref) || sRef_isObserver (tref) | |
3141 | || alkind_isLocal (tkind)) | |
3142 | { | |
3143 | /* okay */ | |
3144 | ||
3145 | if ((transferType == TT_DOASSIGN) && alkind_isLocal (tkind)) | |
3146 | { | |
3147 | if (!tfix) | |
3148 | { | |
3149 | sRef_setAliasKindComplete (tref, fkind, loc); | |
3150 | } | |
3151 | } | |
3152 | } | |
3153 | else | |
3154 | { | |
3155 | if (transferType == TT_FCNRETURN | |
3156 | || transferType == TT_DOASSIGN | |
3157 | || transferType == TT_FIELDASSIGN | |
3158 | || transferType == TT_GLOBINIT) | |
3159 | { | |
3160 | bool hasError = FALSE; | |
3161 | ||
3162 | if (exprNode_isStringLiteral (fexp) | |
3163 | && transferType == TT_GLOBINIT) | |
3164 | { | |
3165 | hasError = optgenerror | |
3166 | (FLG_READONLYTRANS, | |
3167 | message ("Read-only string literal storage %q%q: %q", | |
3168 | sRef_unparseOpt (fref), | |
3169 | transferErrorExpMessage (transferType, tekind), | |
3170 | generateText (fexp, texp, tref, transferType)), | |
3171 | loc); | |
3172 | ||
3173 | sRef_setAliasKind (fref, AK_ERROR, fileloc_undefined); | |
3174 | } | |
3175 | else | |
3176 | { | |
3177 | if ((transferType == TT_DOASSIGN | |
3178 | || transferType == TT_FIELDASSIGN) | |
3179 | && (sRef_isNSLocalVar (tref) | |
3180 | || (exprNode_isStringLiteral (fexp) | |
3181 | && ctype_isRealArray (exprNode_getType (texp))))) | |
3182 | { | |
3183 | ; /* No error for local assignment or assignment | |
3184 | to static array (copies string). */ | |
3185 | } | |
3186 | else | |
3187 | { | |
3188 | if (exprNode_isStringLiteral (fexp)) | |
3189 | { | |
3190 | hasError = optgenerror | |
3191 | (FLG_READONLYTRANS, | |
3192 | message | |
3193 | ("Read-only string literal storage %q%q: %q", | |
3194 | sRef_unparseOpt (fref), | |
3195 | transferErrorExpMessage (transferType, tekind), | |
3196 | generateText (fexp, texp, tref, transferType)), | |
3197 | loc); | |
3198 | ||
3199 | } | |
3200 | ||
3201 | if (!hasError) | |
3202 | { | |
3203 | hasError = optgenerror | |
3204 | (FLG_OBSERVERTRANS, | |
3205 | message | |
3206 | ("Observer storage %q%q: %q", | |
3207 | sRef_unparseOpt (fref), | |
3208 | transferErrorExpMessage (transferType, tekind), | |
3209 | generateText (fexp, texp, tref, transferType)), | |
3210 | loc); | |
3211 | } | |
3212 | } | |
3213 | } | |
3214 | ||
3215 | if (hasError) | |
3216 | { | |
3217 | if (transferType != TT_GLOBINIT) | |
3218 | { | |
3219 | sRef_showExpInfo (fref); | |
3220 | sRef_setAliasKind (tref, AK_ERROR, loc); | |
3221 | } | |
3222 | } | |
3223 | else | |
3224 | { | |
3225 | if (transferType == TT_DOASSIGN && !tfix) | |
3226 | { | |
3227 | DPRINTF (("Setting unknown!")); | |
3228 | /* sRef_setAliasKind (tref, AK_ERROR, loc); */ | |
3229 | } | |
3230 | } | |
3231 | } | |
3232 | else /* TT_FCNPASS */ | |
3233 | { | |
3234 | llassert (transferType == TT_FCNPASS); | |
3235 | ||
3236 | if (alkind_isTemp (tkind) | |
3237 | || alkind_isDependent (tkind) | |
3238 | || alkind_isRefCounted (tkind)) | |
3239 | { | |
3240 | ; /* okay */ | |
3241 | } | |
3242 | else | |
3243 | { | |
3244 | if (!alkind_isError (tkind)) | |
3245 | { | |
3246 | if (optgenerror | |
3247 | (FLG_OBSERVERTRANS, | |
3248 | message ("Observer storage %q%q: %q", | |
3249 | sRef_unparseOpt (fref), | |
3250 | transferErrorMessage (transferType, tkind), | |
3251 | generateText (fexp, texp, tref, transferType)), | |
3252 | loc)) | |
3253 | { | |
3254 | sRef_showExpInfo (fref); | |
3255 | sRef_clearAliasState (fref, loc); | |
3256 | } | |
3257 | } | |
3258 | } | |
3259 | } | |
3260 | } | |
3261 | } | |
3262 | else if (sRef_isExposed (fref) && ctype_isMutable (sRef_getType (fref))) | |
3263 | { | |
3264 | if (transferType == TT_FCNRETURN) | |
3265 | { | |
3266 | if (!(sRef_isExposed (tref) || sRef_isObserver (tref) | |
3267 | || sRef_isParam (fref))) | |
3268 | { | |
3269 | if (optgenerror | |
3270 | (FLG_EXPOSETRANS, | |
3271 | message ("Exposed storage %q%q: %q", | |
3272 | sRef_unparseOpt (fref), | |
3273 | transferErrorExpMessage (transferType, tekind), | |
3274 | generateText (fexp, texp, tref, transferType)), | |
3275 | loc)) | |
3276 | { | |
3277 | sRef_showExpInfo (fref); | |
3278 | } | |
3279 | } | |
3280 | } | |
3281 | else if (transferType == TT_FCNPASS) | |
3282 | { | |
3283 | if (!(sRef_isExposed (tref) | |
3284 | || sRef_isObserver (tref) | |
3285 | || (alkind_isUnknown (tkind) | |
3286 | || alkind_isDependent (tkind) | |
3287 | || alkind_isTemp (tkind) | |
3288 | || alkind_isKillRef (tkind) | |
3289 | || alkind_isRefCounted (tkind)))) | |
3290 | { | |
3291 | if (alkind_isUnique (tkind) || alkind_isError (tkind)) | |
3292 | { | |
3293 | } | |
3294 | else | |
3295 | { | |
3296 | if (optgenerror | |
3297 | (FLG_EXPOSETRANS, | |
3298 | message ("Exposed storage %q%q: %q", | |
3299 | sRef_unparseOpt (fref), | |
3300 | transferErrorMessage (transferType, tkind), | |
3301 | generateText (fexp, texp, tref, transferType)), | |
3302 | loc)) | |
3303 | { | |
3304 | sRef_showExpInfo (fref); | |
3305 | sRef_clearAliasState (fref, loc); | |
3306 | } | |
3307 | } | |
3308 | ||
3309 | } | |
3310 | else | |
3311 | { | |
3312 | ; | |
3313 | } | |
3314 | } | |
2209bcb7 | 3315 | else if (transferType == TT_DOASSIGN |
3316 | /* evans 2001-10-05: added TT_FIELDASSIGN: */ | |
3317 | || transferType == TT_FIELDASSIGN) | |
28bf4b0b | 3318 | { |
3319 | if (!(sRef_isExposed (tref) | |
3320 | || !sRef_isCvar (tref) | |
3321 | || (alkind_isUnknown (tkind) | |
3322 | || alkind_isDependent (tkind) | |
3323 | || alkind_isRefCounted (tkind) | |
3324 | || alkind_isNewRef (tkind) | |
3325 | || alkind_isFresh (tkind) | |
3326 | || alkind_isLocal (tkind)))) | |
3327 | { | |
3328 | if (optgenerror | |
3329 | (FLG_EXPOSETRANS, | |
3330 | message ("Exposed storage %q%q: %q", | |
3331 | sRef_unparseOpt (fref), | |
3332 | transferErrorExpMessage (transferType, tekind), | |
3333 | generateText (fexp, texp, tref, transferType)), | |
3334 | loc)) | |
3335 | { | |
3336 | sRef_showExpInfo (fref); | |
3337 | } | |
3338 | } | |
3339 | if (!tfix) { sRef_setExposed (tref, loc); } | |
3340 | } | |
3341 | else | |
3342 | { | |
3343 | llassert (transferType == TT_GLOBPASS | |
3344 | || transferType == TT_GLOBRETURN | |
3345 | || transferType == TT_PARAMRETURN | |
3346 | || transferType == TT_LEAVETRANS | |
3347 | || transferType == TT_GLOBINIT); | |
3348 | } | |
3349 | } | |
3350 | else | |
3351 | { | |
3352 | ; | |
3353 | } | |
3354 | } | |
3355 | ||
3356 | /* | |
3357 | ** returns TRUE if there is no error reported | |
3358 | ** | |
3359 | ** if fixt, don't change tref (except if error reported.) | |
3360 | ** if fixf, don't change fref (except if error reported.) | |
3361 | */ | |
3362 | ||
3363 | static void | |
3364 | checkTransferAux (exprNode fexp, /*@exposed@*/ sRef fref, bool ffix, | |
3365 | exprNode texp, /*@exposed@*/ sRef tref, bool tfix, | |
3366 | fileloc loc, transferKind transferType) | |
3367 | { | |
3368 | alkind fkind; | |
3369 | alkind tkind; | |
3370 | bool isassign = (transferType == TT_DOASSIGN); | |
3371 | bool isfieldassign = (transferType == TT_FIELDASSIGN); | |
3372 | bool iseitherassign = isassign || (transferType == TT_FIELDASSIGN); | |
3373 | bool isfcnpass = (transferType == TT_FCNPASS); | |
3374 | bool isfcnreturn = (transferType == TT_FCNRETURN); | |
3375 | ||
3376 | setCodePoint (); | |
3377 | ||
3378 | if (!ffix && !tfix) | |
3379 | { | |
3380 | setCodePoint (); | |
3381 | checkTransferNullAux (fref, fexp, ffix, tref, texp, tfix, | |
3382 | loc, transferType); | |
3383 | } | |
3384 | ||
3385 | if (isassign) | |
3386 | { | |
3387 | setCodePoint (); | |
3388 | checkTransferAssignAux (fref, fexp, ffix, tref, texp, tfix, | |
3389 | loc, transferType); | |
3390 | } | |
3391 | ||
3392 | /* | |
3393 | ** Check for definition | |
3394 | */ | |
3395 | ||
3396 | /* | |
3397 | ** errors passing out params already detected in checkAnyCall | |
3398 | */ | |
3399 | ||
3400 | if (!ffix && !tfix) | |
3401 | { | |
3402 | bool defok = TRUE; | |
3403 | ||
3404 | if (!iseitherassign | |
3405 | || (!sRef_isNSLocalVar (tref) | |
3406 | && (sRef_isAnyDefined (tref) || !sRef_stateKnown (tref)))) | |
3407 | { | |
3408 | setCodePoint (); | |
3409 | ||
3410 | if (!ynm_toBoolRelaxed | |
3411 | (checkCompletelyDefined (fexp, fref, fref, | |
3412 | texp, tref, | |
3413 | TRUE, FALSE, FALSE, | |
3414 | loc, transferType, 0, TRUE))) | |
3415 | { | |
3416 | defok = FALSE; | |
3417 | } | |
3418 | } | |
3419 | ||
3420 | setCodePoint (); | |
3421 | ||
3422 | if (defok && iseitherassign) | |
3423 | { | |
3424 | sRef_setDefState (tref, sRef_getDefState (fref), loc); | |
3425 | } | |
3426 | } | |
3427 | ||
3428 | /* | |
3429 | ** check exposure | |
3430 | */ | |
3431 | ||
3432 | setCodePoint (); | |
3433 | checkTransferExposure (fref, fexp, ffix, tref, texp, tfix, | |
3434 | loc, transferType); | |
3435 | ||
3436 | fkind = sRef_getAliasKind (fref); | |
3437 | tkind = sRef_getAliasKind (tref); | |
3438 | ||
3439 | /* | |
3440 | ** check aliasing | |
3441 | */ | |
3442 | ||
3443 | if (alkind_isOnly (fkind)) | |
3444 | { | |
3445 | setCodePoint (); | |
3446 | checkOnlyTransferAux (fref, fexp, ffix, | |
3447 | tref, texp, tfix, | |
3448 | loc, transferType); | |
3449 | } | |
3450 | else if (alkind_isFresh (fkind)) | |
3451 | { | |
3452 | setCodePoint (); | |
3453 | checkFreshTransferAux (fref, fexp, ffix, | |
3454 | tref, texp, tfix, | |
3455 | loc, transferType); | |
3456 | } | |
3457 | else if (alkind_isOwned (fkind)) | |
3458 | { | |
3459 | setCodePoint (); | |
3460 | checkOwnedTransferAux (fref, fexp, ffix, | |
3461 | tref, texp, tfix, | |
3462 | loc, transferType); | |
3463 | } | |
3464 | else if (alkind_isDependent (fkind)) | |
3465 | { | |
3466 | setCodePoint (); | |
3467 | if (isfcnreturn && | |
3468 | (sRef_isExposed (tref) || sRef_isObserver (tref))) | |
3469 | { | |
3470 | ; /* okay */ | |
3471 | } | |
3472 | else if ((alkind_isOnly (tkind) || alkind_isKeep (tkind) | |
3473 | || alkind_isOwned (tkind)) | |
3474 | || (!isfcnpass && alkind_isTemp (tkind))) | |
3475 | { | |
3476 | bool error = TRUE; | |
3477 | ||
3478 | if (sRef_isLocalVar (fref)) | |
3479 | { | |
3480 | sRef depRef = dependentReference (fref); | |
3481 | ||
3482 | if (sRef_isValid (depRef) && sRef_isLocalVar (depRef)) | |
3483 | { | |
3484 | error = FALSE; | |
3485 | sRef_kill (depRef, loc); | |
3486 | sRef_kill (fref, loc); | |
3487 | } | |
3488 | ||
3489 | } | |
3490 | ||
3491 | if (isfieldassign) | |
3492 | { | |
3493 | error = FALSE; | |
3494 | } | |
3495 | ||
3496 | if (canLoseLocalReference (fref, loc)) | |
3497 | { | |
3498 | ; | |
3499 | } | |
3500 | else | |
3501 | { | |
3502 | if (error && | |
3503 | (optgenerror | |
3504 | (FLG_DEPENDENTTRANS, | |
3505 | message ("%s storage %q%q: %q", | |
3506 | alkind_capName (fkind), | |
3507 | sRef_unparseOpt (fref), | |
3508 | transferErrorMessage (transferType, tkind), | |
3509 | generateText (fexp, texp, tref, transferType)), | |
3510 | loc))) | |
3511 | { | |
3512 | DPRINTF (("Here: %s / %s", | |
3513 | sRef_unparseFull (fref), | |
3514 | sRef_unparseFull (tref))); | |
3515 | ||
3516 | sRef_showAliasInfo (fref); | |
3517 | } | |
3518 | } | |
3519 | } | |
3520 | else | |
3521 | { | |
3522 | if (isassign && (alkind_isFresh (tkind) || alkind_isLocal (tkind))) | |
3523 | { | |
3524 | if (!tfix && !ffix) | |
3525 | { | |
3526 | sRef_setDependent (tref, loc); | |
3527 | } | |
3528 | } | |
3529 | } | |
3530 | } | |
3531 | else if (alkind_isShared (fkind)) | |
3532 | { | |
3533 | setCodePoint (); | |
3534 | /* | |
3535 | ** xxx <- shared | |
3536 | */ | |
3537 | ||
3538 | if (alkind_isOnly (tkind) | |
3539 | || (!isfcnpass | |
3540 | && (!(sRef_isObserver (tref) || sRef_isExposed (tref)) | |
3541 | && alkind_isTemp (tkind)))) | |
3542 | { | |
3543 | if (optgenerror | |
3544 | (FLG_SHAREDTRANS, | |
3545 | message ("%s storage %q%q: %q", | |
3546 | alkind_capName (fkind), | |
3547 | sRef_unparseOpt (fref), | |
3548 | transferErrorMessage (transferType, tkind), | |
3549 | generateText (fexp, texp, tref, transferType)), | |
3550 | loc)) | |
3551 | { | |
3552 | sRef_showAliasInfo (fref); | |
3553 | } | |
3554 | } | |
3555 | else | |
3556 | { | |
3557 | if (alkind_isFresh (tkind) || alkind_isLocal (tkind)) | |
3558 | { | |
3559 | sRef_setShared (tref, loc); | |
3560 | } | |
3561 | } | |
3562 | } | |
3563 | else if (alkind_isKeep (fkind)) | |
3564 | { | |
3565 | setCodePoint (); | |
3566 | ||
3567 | if (alkind_isKeep (tkind) | |
3568 | || alkind_isLocal (tkind) | |
3569 | || (isfcnreturn && sRef_isExposed (tref)) | |
3570 | || (iseitherassign | |
3571 | && (alkind_isOnly (tkind) || alkind_isOwned (tkind)))) | |
3572 | { | |
3573 | sRef_setKept (fref, loc); | |
3574 | } | |
3575 | else if (isfcnpass | |
3576 | && (alkind_isTemp (tkind) || alkind_isOwned (tkind))) | |
3577 | { | |
3578 | ; | |
3579 | } | |
3580 | else | |
3581 | { | |
3582 | if (!alkind_isError (tkind)) | |
3583 | { | |
3584 | if (optgenerror | |
3585 | (FLG_KEEPTRANS, | |
3586 | message ("%s storage %q: %q", | |
3587 | alkind_capName (fkind), | |
3588 | transferErrorMessage (transferType, tkind), | |
3589 | generateText (fexp, texp, tref, transferType)), | |
3590 | loc)) | |
3591 | { | |
3592 | sRef_showAliasInfo (fref); | |
3593 | } | |
3594 | } | |
3595 | } | |
3596 | } | |
3597 | else if (alkind_isTemp (fkind) || alkind_isKept (fkind)) | |
3598 | { | |
3599 | /* | |
3600 | ** xxx <- temp | |
3601 | */ | |
3602 | ||
3603 | if (alkind_isOnly (tkind) | |
3604 | || alkind_isShared (tkind) | |
3605 | || (alkind_isTemp (fkind) | |
3606 | && !isfcnreturn && alkind_isDependent (tkind)) | |
3607 | || alkind_isOwned (tkind) | |
3608 | || alkind_isKeep (tkind)) | |
3609 | { | |
3610 | if (!exprNode_isNullValue (fexp) | |
3611 | && (ctype_isMutable (exprNode_getType (fexp)) | |
3612 | || (ctype_isArray (exprNode_getType (fexp)) | |
3613 | && sRef_isParam (fref))) | |
3614 | && (!iseitherassign || sRef_isReference (tref))) | |
3615 | { | |
3616 | if (sRef_isThroughArrayFetch (fref)) | |
3617 | { | |
3618 | if (optgenerror2 | |
3619 | (alkind_isTemp (fkind) ? FLG_TEMPTRANS : FLG_KEPTTRANS, | |
3620 | FLG_STRICTUSERELEASED, | |
3621 | message ("%s storage %q%q: %q", | |
3622 | alkind_capName (fkind), | |
3623 | sRef_unparseOpt (fref), | |
3624 | transferErrorMessage (transferType, tkind), | |
3625 | generateText (fexp, texp, tref, transferType)), | |
3626 | loc)) | |
3627 | { | |
3628 | sRef_showAliasInfo (fref); | |
3629 | } | |
3630 | } | |
3631 | else | |
3632 | { | |
3633 | if (optgenerror | |
3634 | (alkind_isTemp (fkind) ? FLG_TEMPTRANS : FLG_KEPTTRANS, | |
3635 | message ("%s storage %q%q: %q", | |
3636 | alkind_capName (fkind), | |
3637 | sRef_unparseOpt (fref), | |
3638 | transferErrorMessage (transferType, tkind), | |
3639 | generateText (fexp, texp, tref, transferType)), | |
3640 | loc)) | |
3641 | { | |
3642 | sRef_showAliasInfo (fref); | |
3643 | } | |
3644 | } | |
3645 | } | |
3646 | } | |
3647 | } | |
3648 | else if (alkind_isRefCounted (fkind) || alkind_isKillRef (fkind)) | |
3649 | { | |
3650 | if (alkind_isNewRef (tkind)) | |
3651 | { | |
3652 | /* | |
3653 | ** check that the refs field has been modified | |
3654 | */ | |
3655 | ||
3656 | if (!sRef_isConst (fref)) | |
3657 | { | |
3658 | voptgenerror | |
3659 | (FLG_REFCOUNTTRANS, | |
3660 | message ("Reference counted storage returned without modifying " | |
3661 | "reference count: %s", | |
3662 | exprNode_unparse (fexp)), | |
3663 | loc); | |
3664 | } | |
3665 | } | |
3666 | else if (iseitherassign) | |
3667 | { | |
3668 | if (alkind_isRefCounted (fkind)) | |
3669 | { | |
3670 | if (!sRef_isLocalVar (tref)) | |
3671 | { | |
3672 | vgenhinterror | |
3673 | (FLG_REFCOUNTTRANS, | |
3674 | message | |
3675 | ("Assignment to non-local from reference counted storage: %s", | |
3676 | exprNode_unparse (fexp)), | |
3677 | cstring_makeLiteral | |
3678 | ("Reference counted storage should call a function returning " | |
3679 | "a newref instead of direct assignments."), | |
3680 | loc); | |
3681 | } | |
3682 | else | |
3683 | { | |
3684 | ; | |
3685 | } | |
3686 | } | |
3687 | } | |
3688 | else /* fcnpass */ | |
3689 | { | |
3690 | if (alkind_isRefCounted (tkind) || alkind_isTemp (tkind)) | |
3691 | { | |
3692 | /* okay --- no change in state */ | |
3693 | } | |
3694 | else if (alkind_isKillRef (tkind)) | |
3695 | { | |
3696 | if (!ffix && !tfix && !(transferType == TT_FCNRETURN)) | |
3697 | { | |
3698 | sRef_killComplete (fref, loc); | |
3699 | } | |
3700 | } | |
3701 | else | |
3702 | { | |
3703 | if (!alkind_isError (tkind)) | |
3704 | { | |
3705 | voptgenerror | |
3706 | (FLG_REFCOUNTTRANS, | |
3707 | message ("Reference counted storage %q: %q", | |
3708 | transferErrorMessage (transferType, tkind), | |
3709 | generateText (fexp, texp, tref, transferType)), | |
3710 | loc); | |
3711 | } | |
3712 | } | |
3713 | } | |
3714 | } | |
3715 | else | |
3716 | { | |
3717 | ; | |
3718 | } | |
3719 | ||
3720 | setCodePoint (); | |
3721 | ||
3722 | if (alkind_isOnly (tkind) || alkind_isKeep (tkind)) | |
3723 | { | |
3724 | if (sRef_isAddress (fref)) | |
3725 | { | |
3726 | voptgenerror | |
3727 | (FLG_IMMEDIATETRANS, | |
3728 | message ("Immediate address %q %q: %q", | |
3729 | sRef_unparse (fref), | |
3730 | transferErrorMessage (transferType, tkind), | |
3731 | generateText (fexp, texp, tref, transferType)), | |
3732 | loc); | |
3733 | ||
3734 | sRef_setAliasKind (fref, AK_ERROR, loc); | |
3735 | } | |
3736 | else | |
3737 | { | |
3738 | if ((alkind_isUnknown (fkind) || alkind_isStatic (fkind)) | |
3739 | && !sRef_isDefinitelyNull (fref) | |
3740 | && (!ffix && !tfix) | |
3741 | && (!exprNode_isNullValue (fexp))) | |
3742 | { | |
3743 | flagcode errkind = alkind_isStatic (fkind) | |
3744 | ? FLG_STATICTRANS : FLG_UNKNOWNTRANS; | |
3745 | ||
3746 | if (transferType == TT_GLOBINIT) | |
3747 | { | |
3748 | if (errkind == FLG_STATICTRANS) | |
3749 | { | |
3750 | errkind = FLG_STATICINITTRANS; | |
3751 | } | |
3752 | else | |
3753 | { | |
3754 | errkind = FLG_UNKNOWNINITTRANS; | |
3755 | } | |
3756 | } | |
3757 | ||
3758 | if (optgenerror | |
3759 | (errkind, | |
3760 | message ("%s storage %s %q: %q", | |
3761 | alkind_capName (fkind), | |
3762 | exprNode_unparse (fexp), | |
3763 | transferErrorMessage (transferType, tkind), | |
3764 | generateText (fexp, texp, tref, transferType)), | |
3765 | loc)) | |
3766 | { | |
3767 | sRef_showAliasInfo (fref); | |
3768 | } | |
3769 | } | |
3770 | } | |
3771 | ||
3772 | /* don't kill shared to suppress future messages */ | |
3773 | if (!alkind_isShared (fkind)) | |
3774 | { | |
3775 | if (isassign) | |
3776 | { | |
3777 | if (!ffix) | |
3778 | { | |
3779 | /*< yuk! should do this in aliasaux >*/ | |
3780 | ||
3781 | if (!sRef_isNSLocalVar (tref) && !sRef_sameName (fref, tref)) | |
3782 | { | |
3783 | if (!tfix) | |
3784 | { | |
3785 | sRef_setKeptComplete (fref, loc); | |
3786 | } | |
3787 | else | |
3788 | { | |
3789 | sRef_setKept (fref, loc); | |
3790 | } | |
3791 | } | |
3792 | } | |
3793 | } | |
3794 | else | |
3795 | { | |
3796 | if (!ffix) | |
3797 | { | |
3798 | if (!tfix) | |
3799 | { | |
3800 | if (alkind_isKeep (tkind)) | |
3801 | { | |
3802 | sRef_setKeptComplete (fref, loc); | |
3803 | } | |
3804 | else | |
3805 | { | |
3806 | sRef_killComplete (fref, loc); | |
3807 | } | |
3808 | } | |
3809 | else | |
3810 | { | |
3811 | if (alkind_isKeep (tkind)) | |
3812 | { | |
3813 | sRef_setKept (fref, loc); | |
3814 | } | |
3815 | else | |
3816 | { | |
3817 | sRef_kill (fref, loc); | |
3818 | } | |
3819 | } | |
3820 | } | |
3821 | } | |
3822 | } | |
3823 | } | |
3824 | else if (alkind_isOwned (tkind)) | |
3825 | { | |
3826 | /* don't kill shared to suppress future messages */ | |
3827 | if (!alkind_isShared (fkind)) | |
3828 | { | |
3829 | if (!isassign | |
3830 | || !sRef_sameName (fref, tref)) /* result of return parameter */ | |
3831 | { | |
3832 | if (!ffix) | |
3833 | { | |
3834 | if (!tfix) | |
3835 | { | |
3836 | sRef_setDependentComplete (fref, loc); | |
3837 | } | |
3838 | else | |
3839 | { | |
3840 | sRef_setDependent (fref, loc); | |
3841 | } | |
3842 | } | |
3843 | } | |
3844 | } | |
3845 | } | |
3846 | else if (alkind_isShared (tkind)) | |
3847 | { | |
3848 | if (alkind_isFresh (fkind) || alkind_isLocal (fkind)) | |
3849 | { | |
3850 | if (!ffix) | |
3851 | { | |
3852 | sRef_setShared (fref, loc); | |
3853 | } | |
3854 | } | |
3855 | } | |
3856 | else if (alkind_isUnknown (tkind) && context_getFlag (FLG_MEMIMPLICIT)) | |
3857 | { | |
3858 | if (alkind_isDependent (fkind)) | |
3859 | { | |
3860 | if (!exprNode_isNullValue (fexp) | |
3861 | && ctype_isMutable (exprNode_getType (fexp)) | |
3862 | && (!iseitherassign || sRef_isReference (tref))) | |
3863 | { | |
3864 | if (canLoseReference (fref, loc)) | |
3865 | { | |
3866 | ; | |
3867 | } | |
3868 | else | |
3869 | { | |
3870 | if (optgenerror | |
3871 | (FLG_DEPENDENTTRANS, | |
3872 | message ("%s storage %q%q: %q", | |
3873 | alkind_capName (fkind), | |
3874 | sRef_unparseOpt (fref), | |
3875 | transferErrorMessage (transferType, tkind), | |
3876 | generateText (fexp, texp, tref, transferType)), | |
3877 | loc)) | |
3878 | { | |
3879 | DPRINTF (("Here: %s / %s", sRef_unparseFull (fref), | |
3880 | sRef_unparseFull (tref))); | |
3881 | sRef_showAliasInfo (fref); | |
3882 | } | |
3883 | } | |
3884 | } | |
3885 | } | |
3886 | } | |
3887 | else if (alkind_isNewRef (tkind)) | |
3888 | { | |
3889 | if (!ffix && !tfix) | |
3890 | { | |
3891 | sRef_killComplete (fref, loc); | |
3892 | } | |
3893 | } | |
3894 | else if (alkind_isKillRef (tkind)) | |
3895 | { | |
3896 | if (transferType == TT_FCNRETURN) | |
3897 | { | |
3898 | if (sRef_isNewRef (fref)) | |
3899 | { | |
3900 | if (optgenerror | |
3901 | (FLG_REFCOUNTTRANS, | |
3902 | message ("New reference returned as temp reference: %q", | |
3903 | generateText (fexp, texp, tref, transferType)), | |
3904 | loc)) | |
3905 | { | |
3906 | sRef_showAliasInfo (fref); | |
3907 | } | |
3908 | } | |
3909 | } | |
3910 | else | |
3911 | { | |
3912 | if (sRef_isNewRef (fref)) | |
3913 | { | |
3914 | sRef_killComplete (fref, loc); | |
3915 | } | |
3916 | else | |
3917 | { | |
3918 | if (sRef_isRefCounted (fref) | |
3919 | && sRef_isCvar (fref) | |
3920 | && !sRef_isLocalVar (fref)) | |
3921 | { | |
3922 | if (optgenerror | |
3923 | (FLG_REFCOUNTTRANS, | |
3924 | message | |
3925 | ("External reference counted storage released: %q", | |
3926 | generateText (fexp, texp, tref, transferType)), | |
3927 | loc)) | |
3928 | { | |
3929 | sRef_showAliasInfo (fref); | |
3930 | } | |
3931 | } | |
3932 | } | |
3933 | } | |
3934 | ||
3935 | } | |
3936 | else | |
3937 | { | |
3938 | ; | |
3939 | } | |
3940 | ||
3941 | setCodePoint (); | |
3942 | } | |
3943 | ||
3944 | static void | |
3945 | checkMetaStateConsistent (/*@exposed@*/ sRef fref, sRef tref, | |
3946 | fileloc loc, /*@unused@*/ transferKind transferType) | |
3947 | { | |
3948 | /* | |
3949 | ** Checks if it is consistent to leave storage marked as tref in state of fref. | |
3950 | */ | |
3951 | ||
3952 | valueTable fvalues = sRef_getValueTable (fref); | |
3953 | valueTable tvalues = sRef_getValueTable (tref); | |
3954 | ||
3955 | DPRINTF (("Metastate consistent: %s => %s", | |
3956 | sRef_unparseFull (fref), | |
3957 | sRef_unparseFull (tref))); | |
3958 | ||
3959 | if (valueTable_isUndefined (tvalues) || valueTable_isUndefined (fvalues)) { | |
3960 | /* Cannot check without value tables. An error was already detected. */ | |
3961 | DPRINTF (("No value table: %s / %s", | |
3962 | bool_unparse (valueTable_isUndefined (tvalues)), | |
3963 | bool_unparse (valueTable_isUndefined (fvalues)))); | |
3964 | return; | |
3965 | } | |
3966 | ||
3967 | valueTable_elements (fvalues, fkey, fval) { | |
3968 | stateValue tval; | |
3969 | metaStateInfo minfo; | |
3970 | ||
3971 | DPRINTF (("Transfer: %s", fkey)); | |
3972 | tval = valueTable_lookup (tvalues, fkey); | |
3973 | minfo = context_lookupMetaStateInfo (fkey); | |
3974 | ||
3975 | if (!stateValue_isDefined (tval)) | |
3976 | { | |
3977 | if (ctype_isUnknown (sRef_getType (fref))) | |
3978 | { | |
3979 | ; /* Okay, put in default values without knowing type */ | |
3980 | } | |
3981 | else | |
3982 | { | |
3983 | /*@i#!@!!@*/ | |
3984 | DPRINTF (("Cannot find meta state for: %s / to: %s / %s", sRef_unparseFull (fref), | |
3985 | sRef_unparseFull (tref), | |
3986 | fkey)); | |
3987 | } | |
3988 | } | |
3989 | else | |
3990 | { | |
3991 | llassert (metaStateInfo_isDefined (minfo)); | |
3992 | ||
3993 | if (stateValue_isError (fval) || stateValue_isError (tval)) | |
3994 | { | |
3995 | ; | |
3996 | } | |
b072092f | 3997 | else if (sRef_isDefinitelyNull (fref) |
3998 | || usymtab_isDefinitelyNull (fref)) | |
28bf4b0b | 3999 | { |
b072092f | 4000 | ; /* No errors for null values in state transfers. */ |
4001 | } | |
4002 | ||
4003 | else | |
4004 | { | |
4005 | stateCombinationTable sctable = metaStateInfo_getTransferTable (minfo); | |
4006 | cstring msg = cstring_undefined; | |
4007 | int nval = stateCombinationTable_lookup (sctable, | |
4008 | stateValue_getValue (fval), | |
4009 | stateValue_getValue (tval), | |
4010 | &msg); | |
28bf4b0b | 4011 | |
b072092f | 4012 | if (nval == stateValue_error) |
28bf4b0b | 4013 | { |
b072092f | 4014 | if (transferType == TT_LEAVETRANS) |
4015 | { | |
4016 | BADBRANCH; | |
4017 | } | |
4018 | else if (transferType == TT_GLOBRETURN) | |
4019 | { | |
4020 | if (optgenerror | |
4021 | (FLG_STATETRANSFER, | |
4022 | message | |
b7e84605 | 4023 | ("Function returns with global %q in inconsistent state (%q is %q, should be %q)%q", |
b072092f | 4024 | sRef_unparse (sRef_getRootBase (fref)), |
4025 | sRef_unparse (fref), | |
4026 | stateValue_unparseValue (fval, minfo), | |
4027 | stateValue_unparseValue (tval, minfo), | |
b7e84605 | 4028 | cstring_isDefined (msg) |
4029 | ? message (": %s", msg) : cstring_undefined), | |
b072092f | 4030 | loc)) |
4031 | { | |
4032 | sRef_showMetaStateInfo (fref, fkey); | |
4033 | } | |
4034 | } | |
4035 | else if (transferType == TT_GLOBPASS) | |
28bf4b0b | 4036 | { |
b072092f | 4037 | if (optgenerror |
4038 | (FLG_STATETRANSFER, | |
4039 | message | |
b7e84605 | 4040 | ("Function called with global %q in inconsistent state (%q is %q, should be %q)%q", |
b072092f | 4041 | sRef_unparse (sRef_getRootBase (fref)), |
4042 | stateValue_unparseValue (fval, minfo), | |
4043 | sRef_unparse (fref), | |
4044 | stateValue_unparseValue (tval, minfo), | |
b7e84605 | 4045 | cstring_isDefined (msg) |
4046 | ? message (": %s", msg) : cstring_undefined), | |
b072092f | 4047 | loc)) |
4048 | { | |
4049 | sRef_showMetaStateInfo (fref, fkey); | |
4050 | } | |
28bf4b0b | 4051 | } |
b072092f | 4052 | else if (transferType == TT_PARAMRETURN) |
4053 | { | |
4054 | if (optgenerror | |
4055 | (FLG_STATETRANSFER, | |
4056 | message | |
b7e84605 | 4057 | ("Function returns with parameter %q in inconsistent state (%q is %q, should be %q)%q", |
b072092f | 4058 | sRef_unparse (sRef_getRootBase (fref)), |
b7e84605 | 4059 | sRef_unparse (fref), |
b072092f | 4060 | stateValue_unparseValue (fval, minfo), |
b072092f | 4061 | stateValue_unparseValue (tval, minfo), |
b7e84605 | 4062 | cstring_isDefined (msg) |
4063 | ? message (": %s", msg) : cstring_undefined), | |
b072092f | 4064 | loc)) |
4065 | { | |
4066 | sRef_showMetaStateInfo (fref, fkey); | |
4067 | } | |
4068 | } | |
4069 | else | |
4070 | { | |
4071 | if (optgenerror | |
4072 | (FLG_STATETRANSFER, | |
4073 | message | |
b7e84605 | 4074 | ("Invalid transfer from %q %x to %q (%q)%q", |
b072092f | 4075 | stateValue_unparseValue (fval, minfo), |
4076 | sRef_unparse (fref), | |
4077 | stateValue_unparseValue (tval, minfo), | |
4078 | sRef_unparse (tref), | |
b7e84605 | 4079 | cstring_isDefined (msg) |
4080 | ? message (": %s", msg) : cstring_undefined), | |
b072092f | 4081 | loc)) |
4082 | { | |
4083 | sRef_showMetaStateInfo (fref, fkey); | |
4084 | } | |
4085 | } | |
4086 | ||
4087 | } | |
b7e84605 | 4088 | |
b072092f | 4089 | if (stateValue_getValue (fval) != nval) |
4090 | { | |
4091 | stateValue_updateValueLoc (fval, nval, loc); | |
28bf4b0b | 4092 | } |
28bf4b0b | 4093 | } |
4094 | } | |
4095 | ||
4096 | DPRINTF (("Transfer: %s %s -> %s", | |
4097 | fkey, stateValue_unparse (fval), stateValue_unparse (tval))); | |
4098 | } end_valueTable_elements ; | |
4099 | } | |
4100 | ||
4101 | static void | |
4102 | checkMetaStateTransfer (exprNode fexp, sRef fref, exprNode texp, sRef tref, | |
0bf5022d | 4103 | exprNode fcn, |
28bf4b0b | 4104 | fileloc loc, transferKind /*@i32@*/ transferType) |
4105 | { | |
4106 | valueTable fvalues = sRef_getValueTable (fref); | |
4107 | valueTable tvalues = sRef_getValueTable (tref); | |
4108 | ||
4109 | DPRINTF (("Metastate transfer: from %s", exprNode_unparse (fexp))); | |
c8dda690 | 4110 | |
28bf4b0b | 4111 | DPRINTF (("Metastate transfer: %s => %s", |
4112 | sRef_unparseFull (fref), | |
4113 | sRef_unparseFull (tref))); | |
4114 | ||
4115 | if (valueTable_isUndefined (tvalues) || valueTable_isUndefined (fvalues)) { | |
4116 | /* Cannot check without value tables. An error was already detected. */ | |
4117 | DPRINTF (("No value table: %s / %s", | |
4118 | bool_unparse (valueTable_isUndefined (tvalues)), | |
4119 | bool_unparse (valueTable_isUndefined (fvalues)))); | |
4120 | return; | |
4121 | } | |
4122 | ||
4123 | valueTable_elements (fvalues, fkey, fval) { | |
4124 | stateValue tval; | |
4125 | metaStateInfo minfo; | |
4126 | stateCombinationTable sctable; | |
4127 | cstring msg; | |
4128 | int nval; | |
4129 | ||
4130 | DPRINTF (("Transfer: %s", fkey)); | |
4131 | tval = valueTable_lookup (tvalues, fkey); | |
4132 | minfo = context_lookupMetaStateInfo (fkey); | |
4133 | ||
4134 | if (!stateValue_isDefined (tval)) | |
4135 | { | |
4136 | if (ctype_isUnknown (sRef_getType (fref))) | |
4137 | { | |
4138 | ; /* Okay, put in default values without knowing type */ | |
4139 | } | |
4140 | else | |
4141 | { | |
4142 | /*@i#!@!!@*/ | |
4143 | DPRINTF (("Metastate transfer: %s => %s", | |
4144 | exprNode_unparse (fexp), exprNode_unparse (texp))); | |
4145 | DPRINTF (("Cannot find meta state for: %s / to: %s / %s", sRef_unparseFull (fref), | |
4146 | sRef_unparseFull (tref), | |
4147 | fkey)); | |
4148 | } | |
4149 | } | |
4150 | else | |
4151 | { | |
4152 | llassert (metaStateInfo_isDefined (minfo)); | |
4153 | ||
990ec868 | 4154 | if (stateValue_isError (fval)) |
28bf4b0b | 4155 | { |
4156 | ; | |
4157 | } | |
990ec868 | 4158 | else if (stateValue_isError (tval)) |
4159 | { | |
4160 | if (sRef_isLocalVar (tref) && transferType == TT_DOASSIGN) | |
4161 | { | |
4162 | /* Local assignments just replace state. */ | |
4163 | stateValue_updateValueLoc (tval, stateValue_getValue (fval), loc); | |
4164 | DPRINTF (("Update: %s", stateValue_unparse (tval))); | |
4165 | } | |
4166 | else if (transferType == TT_FCNRETURN) | |
4167 | { | |
4168 | ; /* Returning from an unannotated function */ | |
4169 | } | |
4170 | else | |
4171 | { | |
b37cf05e | 4172 | DPRINTF (("Transfer to error: %s / %s", sRef_unparseFull (tref), |
4173 | transferType_unparse (transferType))); | |
990ec868 | 4174 | } |
4175 | } | |
28bf4b0b | 4176 | else |
4177 | { | |
4178 | DPRINTF (("Check: %s / %s / %s / %s", fkey, | |
4179 | metaStateInfo_unparse (minfo), | |
4180 | stateValue_unparse (fval), | |
4181 | stateValue_unparse (tval))); | |
4182 | ||
4183 | sctable = metaStateInfo_getTransferTable (minfo); | |
4184 | msg = cstring_undefined; | |
4185 | ||
4186 | nval = stateCombinationTable_lookup (sctable, | |
4187 | stateValue_getValue (fval), | |
4188 | stateValue_getValue (tval), | |
4189 | &msg); | |
4190 | ||
4191 | if (transferType == TT_DOASSIGN && sRef_isLocalVar (tref)) | |
4192 | { | |
4193 | /* Local assignments just replace state. */ | |
4194 | DPRINTF (("No transfer error assigning to local: %s", msg)); | |
4195 | stateValue_updateValueLoc (tval, stateValue_getValue (fval), loc); | |
990ec868 | 4196 | DPRINTF (("Update: %s", stateValue_unparse (tval))); |
28bf4b0b | 4197 | } |
4198 | else | |
4199 | { | |
b7e84605 | 4200 | if (nval == stateValue_error) |
28bf4b0b | 4201 | { |
4202 | /*@i32 print extra info for assignments@*/ | |
4203 | ||
4204 | if (optgenerror | |
4205 | (FLG_STATETRANSFER, | |
4206 | message | |
b7e84605 | 4207 | ("Invalid transfer from %q %x to %q%q: %q", |
2c88d156 | 4208 | stateValue_unparseValue (fval, minfo), |
28bf4b0b | 4209 | sRef_unparse (fref), |
2c88d156 | 4210 | stateValue_unparseValue (tval, minfo), |
b7e84605 | 4211 | cstring_isDefined (msg) |
4212 | ? message (" (%s)", msg) : cstring_undefined, | |
0bf5022d | 4213 | transferErrorExcerpt (transferType, fexp, texp, fcn)), |
28bf4b0b | 4214 | loc)) |
4215 | { | |
2c88d156 | 4216 | sRef_showMetaStateInfo (fref, fkey); |
b7e84605 | 4217 | sRef_showMetaStateInfo (tref, fkey); |
28bf4b0b | 4218 | } |
4219 | else | |
4220 | { | |
4221 | DPRINTF (("Suppressed transfer error: %s", msg)); | |
4222 | } | |
4223 | } | |
4224 | else | |
4225 | { | |
4226 | if (transferType == TT_FCNRETURN) | |
4227 | { | |
4228 | /* | |
4229 | ** Returning this reference from a function, mark this reference | |
4230 | ** so no lost reference errors are returned. | |
4231 | */ | |
4232 | ||
4233 | stateValue_updateValueLoc (fval, stateValue_error, loc); | |
4234 | } | |
4235 | else if (stateValue_getValue (fval) != nval) | |
4236 | { | |
4237 | stateValue_updateValueLoc (fval, nval, loc); | |
4238 | } | |
4239 | else | |
4240 | { | |
4241 | ; | |
4242 | } | |
4243 | } | |
4244 | } | |
4245 | } | |
4246 | } | |
4247 | ||
4248 | DPRINTF (("Transfer: %s %s -> %s", | |
4249 | fkey, stateValue_unparse (fval), stateValue_unparse (tval))); | |
4250 | } end_valueTable_elements ; | |
4251 | } | |
4252 | ||
4253 | /* | |
4254 | ** assigns fexp := tref or passes fexp as a parameter, or returns fexp. | |
4255 | ** | |
4256 | ** For assignments, sets alias and definition state accordingly. | |
4257 | */ | |
4258 | ||
4259 | static void | |
4260 | checkTransfer (exprNode fexp, /*@dependent@*/ sRef fref, | |
4261 | exprNode texp, /*@dependent@*/ sRef tref, | |
0bf5022d | 4262 | exprNode fcn, |
28bf4b0b | 4263 | fileloc loc, transferKind transferType) |
4264 | { | |
4265 | setCodePoint (); | |
4266 | ||
4267 | if (context_inProtectVars ()) | |
4268 | { | |
4269 | return; | |
4270 | } | |
4271 | ||
4272 | DPRINTF (("Check transfer: %s => %s", | |
4273 | sRef_unparse (fref), | |
4274 | sRef_unparse (tref))); | |
4275 | DPRINTF (("Check transfer: %s => %s", | |
4276 | exprNode_unparse (fexp), | |
4277 | exprNode_unparse (texp))); | |
4278 | ||
0bf5022d | 4279 | checkMetaStateTransfer (fexp, fref, texp, tref, fcn, |
4280 | loc, transferType); | |
28bf4b0b | 4281 | |
4282 | /* | |
4283 | ** for local references, we need to check | |
4284 | ** the transfer for all possible aliases. | |
4285 | */ | |
4286 | ||
4287 | if (sRef_isLocalVar (tref) && transferType != TT_DOASSIGN) | |
4288 | { | |
4289 | sRefSet alias = usymtab_allAliases (tref); | |
4290 | ||
4291 | sRefSet_realElements (alias, atref) | |
4292 | { | |
4293 | sRef abase = sRef_getRootBase (atref); | |
4294 | ||
4295 | if (sRef_isKnown (atref) | |
4296 | && !sRef_isLocalVar (abase) | |
4297 | && !sRef_isExternal (abase)) | |
4298 | { | |
4299 | atref = sRef_updateSref (atref); | |
4300 | ||
4301 | if (sRef_hasName (atref)) | |
4302 | { | |
4303 | if (!sRef_isNew (atref) | |
4304 | && !sRef_sameName (tref, atref)) | |
4305 | { | |
4306 | context_setAliasAnnote (atref, tref); | |
4307 | } | |
4308 | ||
4309 | checkTransferAux (fexp, fref, TRUE, | |
4310 | texp, atref, FALSE, | |
4311 | loc, transferType); | |
4312 | ||
4313 | context_clearAliasAnnote (); | |
4314 | } | |
4315 | } | |
4316 | } end_sRefSet_realElements; | |
4317 | ||
4318 | sRefSet_free (alias); | |
4319 | } | |
4320 | ||
4321 | if (sRef_isLocalVar (fref)) | |
4322 | { | |
4323 | sRefSet alias = usymtab_allAliases (fref); | |
4324 | ||
4325 | sRefSet_realElements (alias, afref) | |
4326 | { | |
4327 | sRef abase = sRef_getRootBase (afref); | |
4328 | ||
4329 | if (sRef_isKnown (afref) | |
4330 | && !sRef_isLocalVar (abase) | |
4331 | && !sRef_isExternal (abase)) | |
4332 | { | |
4333 | afref = sRef_updateSref (afref); | |
4334 | ||
4335 | if (sRef_hasName (afref)) | |
4336 | { | |
4337 | if (!sRef_isNew (afref) | |
4338 | && !sRef_sameName (afref, fref)) | |
4339 | { | |
4340 | context_setAliasAnnote (afref, fref); | |
4341 | } | |
4342 | ||
4343 | checkTransferAux (fexp, afref, FALSE, | |
4344 | texp, tref, TRUE, | |
4345 | loc, transferType); | |
4346 | ||
4347 | context_clearAliasAnnote (); | |
4348 | } | |
4349 | } | |
4350 | } end_sRefSet_realElements; | |
4351 | ||
4352 | sRefSet_free (alias); | |
4353 | } | |
4354 | ||
4355 | setCodePoint (); | |
4356 | checkTransferAux (fexp, fref, FALSE, texp, tref, FALSE, | |
4357 | loc, transferType); | |
4358 | setCodePoint (); | |
4359 | } | |
4360 | ||
4361 | static /*@exposed@*/ sRef | |
4362 | dependentReference (sRef sr) | |
4363 | { | |
4364 | sRefSet ab = usymtab_aliasedBy (sr); /* yes, really mean aliasedBy */ | |
4365 | ||
4366 | DPRINTF (("Dependent reference: %s", sRef_unparse (sr))); | |
4367 | DPRINTF (("Aliases: %s", sRefSet_unparse (ab))); | |
4368 | ||
4369 | /* | |
4370 | ** If there is a local variable that aliases sr, then there is no | |
4371 | ** error. Make the local an only. | |
4372 | */ | |
4373 | ||
4374 | if (!sRefSet_isEmpty (ab)) | |
4375 | { | |
4376 | sRef res = sRef_undefined; | |
4377 | ||
4378 | DPRINTF (("Here we are!")); | |
4379 | ||
4380 | /* | |
4381 | ** make one an only, others alias it | |
4382 | */ | |
4383 | ||
4384 | sRefSet_realElements (ab, current) | |
4385 | { | |
4386 | if (sRef_isOwned (current)) | |
4387 | { | |
4388 | res = current; | |
4389 | break; | |
4390 | } | |
4391 | } end_sRefSet_realElements; | |
4392 | ||
4393 | if (sRef_isInvalid (res)) | |
4394 | { | |
4395 | /* | |
4396 | ** evans - 2001-03-24 | |
4397 | ** No owned element, just choose one! | |
4398 | ** (Any reason for preference?) | |
4399 | */ | |
4400 | ||
4401 | res = sRefSet_choose (ab); | |
4402 | } | |
4403 | ||
4404 | sRefSet_free (ab); | |
4405 | return res; | |
4406 | } | |
4407 | ||
4408 | return sRef_undefined; | |
4409 | } | |
4410 | ||
4411 | bool canLoseReference (/*@dependent@*/ sRef sr, fileloc loc) | |
4412 | { | |
4413 | bool gotone = FALSE; | |
4414 | sRefSet ab = usymtab_aliasedBy (sr); /* yes, really mean aliasedBy */ | |
4415 | ||
4416 | /* | |
4417 | ** if there is a local variable that aliases sr, then there is no | |
4418 | ** error. Make the local an only. | |
4419 | */ | |
4420 | ||
4421 | if (!sRefSet_isEmpty (ab)) | |
4422 | { | |
4423 | /* | |
4424 | ** make one an only, others alias it | |
4425 | */ | |
4426 | ||
4427 | sRefSet_realElements (ab, current) | |
4428 | { | |
4429 | sRef_setLastReference (current, sr, loc); | |
4430 | gotone = TRUE; | |
4431 | break; | |
4432 | } end_sRefSet_realElements; | |
4433 | ||
4434 | sRefSet_free (ab); | |
4435 | } | |
4436 | ||
4437 | return gotone; | |
4438 | } | |
4439 | ||
4440 | bool canLoseLocalReference (/*@dependent@*/ sRef sr, fileloc loc) | |
4441 | { | |
4442 | bool gotone = FALSE; | |
4443 | sRefSet ab = usymtab_aliasedBy (sr); /* yes, really mean aliasedBy */ | |
4444 | ||
4445 | /* | |
4446 | ** if there is a local variable that aliases sr, then there is no | |
4447 | ** error. Make the local an only. | |
4448 | */ | |
4449 | ||
4450 | if (!sRefSet_isEmpty (ab)) | |
4451 | { | |
4452 | /* | |
4453 | ** make one an only, others alias it | |
4454 | */ | |
4455 | ||
4456 | sRefSet_realElements (ab, current) | |
4457 | { | |
4458 | if (sRef_isRealLocalVar (sRef_getRootBase (current))) | |
4459 | { | |
4460 | sRef_setLastReference (current, sr, loc); | |
4461 | gotone = TRUE; | |
4462 | break; | |
4463 | } | |
4464 | } end_sRefSet_realElements; | |
4465 | ||
4466 | sRefSet_free (ab); | |
4467 | } | |
4468 | ||
4469 | return gotone; | |
4470 | } |