]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | ** LCLint - annotation-assisted static program checker | |
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 | |
22 | ** For more information: http://lclint.cs.virginia.edu | |
23 | */ | |
24 | ||
25 | /* | |
26 | ** constraint.c | |
27 | */ | |
28 | ||
29 | /* #define DEBUGPRINT 1 */ | |
30 | ||
31 | # include <ctype.h> /* for isdigit */ | |
32 | # include "lclintMacros.nf" | |
33 | # include "basic.h" | |
34 | # include "cgrammar.h" | |
35 | # include "cgrammar_tokens.h" | |
36 | ||
37 | # include "exprChecks.h" | |
38 | # include "exprNodeSList.h" | |
39 | ||
40 | /*@i33*/ | |
41 | ||
42 | /*@access exprNode @*/ | |
43 | ||
44 | ||
45 | static /*@only@*/ cstring constraint_printDetailedPostCondition (/*@observer@*/ /*@temp@*/ constraint p_c); | |
46 | ||
47 | ||
48 | static /*@notnull@*/ /*@special@*/ constraint constraint_makeNew (void) | |
49 | /*@post:isnull result->or, result->orig, result->generatingExpr, result->fcnPre @*/ | |
50 | /*@defines result->or, result->generatingExpr, result->orig, result->fcnPre @*/; | |
51 | ||
52 | static void | |
53 | advanceField (char **s) | |
54 | { | |
55 | reader_checkChar (s, '@'); | |
56 | } | |
57 | ||
58 | # if 0 | |
59 | static constraint makeConstraintParse2 (constraintExpr l, lltok relOp, exprNode cconstant) | |
60 | { | |
61 | char *t; | |
62 | int c; | |
63 | constraint ret; | |
64 | ret = constraint_makeNew (); | |
65 | llassert (constraintExpr_isDefined(l) ); | |
66 | ||
67 | ret->lexpr = constraintExpr_copy (l); | |
68 | ||
69 | ||
70 | if (relOp.tok == GE_OP) | |
71 | ret->ar = GTE; | |
72 | else if (relOp.tok == LE_OP) | |
73 | ret->ar = LTE; | |
74 | else if (relOp.tok == EQ_OP) | |
75 | ret->ar = EQ; | |
76 | else | |
77 | llfatalbug(message("Unsupported relational operator") ); | |
78 | ||
79 | ||
80 | t = cstring_toCharsSafe (exprNode_unparse(cconstant)); | |
81 | c = atoi( t ); | |
82 | ret->expr = constraintExpr_makeIntLiteral (c); | |
83 | ||
84 | ret->post = TRUE; | |
85 | DPRINTF(("GENERATED CONSTRAINT:")); | |
86 | DPRINTF( (message ("%s", constraint_print(ret) ) ) ); | |
87 | return ret; | |
88 | } | |
89 | # endif | |
90 | ||
91 | bool constraint_same (constraint c1, constraint c2) | |
92 | { | |
93 | llassert (c1 != NULL); | |
94 | llassert (c2 != NULL); | |
95 | ||
96 | if (c1->ar != c2->ar) | |
97 | { | |
98 | return FALSE; | |
99 | } | |
100 | ||
101 | if (!constraintExpr_similar (c1->lexpr, c2->lexpr) ) | |
102 | { | |
103 | return FALSE; | |
104 | } | |
105 | ||
106 | if (!constraintExpr_similar (c1->expr, c2->expr) ) | |
107 | { | |
108 | return FALSE; | |
109 | } | |
110 | ||
111 | return TRUE; | |
112 | } | |
113 | ||
114 | constraint makeConstraintParse3 (constraintExpr l, lltok relOp, constraintExpr r) | |
115 | { | |
116 | constraint ret; | |
117 | ret = constraint_makeNew(); | |
118 | llassert (constraintExpr_isDefined(l) ); | |
119 | ||
120 | ret->lexpr = constraintExpr_copy (l); | |
121 | ||
122 | if (relOp.tok == GE_OP) | |
123 | ret->ar = GTE; | |
124 | else if (relOp.tok == LE_OP) | |
125 | ret->ar = LTE; | |
126 | else if (relOp.tok == EQ_OP) | |
127 | ret->ar = EQ; | |
128 | else | |
129 | llfatalbug( message("Unsupported relational operator") ); | |
130 | ||
131 | ret->expr = constraintExpr_copy (r); | |
132 | ||
133 | ret->post = TRUE; | |
134 | ||
135 | ret->orig = constraint_copy(ret); | |
136 | ||
137 | ret = constraint_simplify (ret); | |
138 | /* ret->orig = ret; */ | |
139 | ||
140 | DPRINTF(("GENERATED CONSTRAINT:")); | |
141 | DPRINTF( (message ("%s", constraint_print(ret) ) ) ); | |
142 | return ret; | |
143 | } | |
144 | ||
145 | constraint constraint_copy (/*@temp@*/ /*@observer@*/ constraint c) | |
146 | { | |
147 | constraint ret; | |
148 | ||
149 | llassert (constraint_isDefined(c) ); | |
150 | ||
151 | ret = constraint_makeNew(); | |
152 | ret->lexpr = constraintExpr_copy (c->lexpr); | |
153 | ret->ar = c->ar; | |
154 | ret->expr = constraintExpr_copy (c->expr); | |
155 | ret->post = c->post; | |
156 | /*@-assignexpose@*/ | |
157 | ret->generatingExpr = c->generatingExpr; | |
158 | /*@=assignexpose@*/ | |
159 | ||
160 | /*@i33 fix this*/ | |
161 | if (c->orig != NULL) | |
162 | ret->orig = constraint_copy (c->orig); | |
163 | else | |
164 | ret->orig = NULL; | |
165 | ||
166 | if (c->or != NULL) | |
167 | ret->or = constraint_copy (c->or); | |
168 | else | |
169 | ret->or = NULL; | |
170 | ||
171 | ret->fcnPre = c->fcnPre; | |
172 | ||
173 | return ret; | |
174 | } | |
175 | ||
176 | /*like copy expect it doesn't allocate memory for the constraint*/ | |
177 | ||
178 | void constraint_overWrite (constraint c1, constraint c2) | |
179 | { | |
180 | llassert (constraint_isDefined(c1) ); | |
181 | ||
182 | llassert (c1 != c2); | |
183 | ||
184 | DPRINTF((message("OverWriteing constraint %q with %q", constraint_print(c1), | |
185 | constraint_print(c2) ) )); | |
186 | ||
187 | constraintExpr_free(c1->lexpr); | |
188 | constraintExpr_free(c1->expr); | |
189 | ||
190 | c1->lexpr = constraintExpr_copy (c2->lexpr); | |
191 | c1->ar = c2->ar; | |
192 | c1->expr = constraintExpr_copy (c2->expr); | |
193 | c1->post = c2->post; | |
194 | ||
195 | if (c1->orig != NULL) | |
196 | constraint_free (c1->orig); | |
197 | ||
198 | if (c2->orig != NULL) | |
199 | c1->orig = constraint_copy (c2->orig); | |
200 | else | |
201 | c1->orig = NULL; | |
202 | ||
203 | /*@i33 make sure that the or is freed correctly*/ | |
204 | if (c1->or != NULL) | |
205 | constraint_free (c1->or); | |
206 | ||
207 | if (c2->or != NULL) | |
208 | c1->or = constraint_copy (c2->or); | |
209 | else | |
210 | c1->or = NULL; | |
211 | ||
212 | c1->fcnPre = c2->fcnPre; | |
213 | ||
214 | /*@-assignexpose@*/ | |
215 | c1->generatingExpr = c2->generatingExpr; | |
216 | /*@=assignexpose@*/ | |
217 | } | |
218 | ||
219 | ||
220 | ||
221 | static /*@notnull@*/ /*@special@*/ constraint constraint_makeNew (void) | |
222 | /*@post:isnull result->or, result->orig, result->generatingExpr, result->fcnPre @*/ | |
223 | /*@defines result->or, result->generatingExpr, result->orig, result->fcnPre @*/ | |
224 | { | |
225 | constraint ret; | |
226 | ret = dmalloc(sizeof (*ret) ); | |
227 | ret->lexpr = NULL; | |
228 | ret->expr = NULL; | |
229 | ret->ar = LT; | |
230 | ret->post = FALSE; | |
231 | ret->orig = NULL; | |
232 | ret->or = NULL; | |
233 | ret->generatingExpr = NULL; | |
234 | ret->fcnPre = NULL; | |
235 | return ret; | |
236 | } | |
237 | ||
238 | constraint constraint_addGeneratingExpr (/*@returned@*/ constraint c, /*@exposed@*/ exprNode e) | |
239 | { | |
240 | ||
241 | if (c->generatingExpr == NULL) | |
242 | { | |
243 | c->generatingExpr = e; | |
244 | DPRINTF ((message ("setting generatingExpr for %s to %s", constraint_print(c), exprNode_unparse(e) ) )); | |
245 | } | |
246 | else | |
247 | { | |
248 | DPRINTF ((message ("Not setting generatingExpr for %s to %s", constraint_print(c), exprNode_unparse(e) ) )); | |
249 | } | |
250 | return c; | |
251 | } | |
252 | ||
253 | constraint constraint_origAddGeneratingExpr (/*@returned@*/ constraint c, exprNode e) | |
254 | { | |
255 | ||
256 | if (c->orig != constraint_undefined) | |
257 | { | |
258 | c->orig = constraint_addGeneratingExpr(c->orig, e); | |
259 | } | |
260 | else | |
261 | { | |
262 | DPRINTF ((message ("constraint_origAddGeneratingExpr: Not setting generatingExpr for %s to %s", constraint_print(c), exprNode_unparse(e) ) )); | |
263 | } | |
264 | return c; | |
265 | } | |
266 | ||
267 | constraint constraint_setFcnPre (/*@returned@*/ constraint c ) | |
268 | { | |
269 | ||
270 | if (c->orig != constraint_undefined) | |
271 | { | |
272 | c->orig->fcnPre = TRUE; | |
273 | } | |
274 | else | |
275 | { | |
276 | c->fcnPre = TRUE; | |
277 | DPRINTF(( message("Warning Setting fcnPre directly") )); | |
278 | } | |
279 | return c; | |
280 | } | |
281 | ||
282 | ||
283 | ||
284 | ||
285 | fileloc constraint_getFileloc (constraint c) | |
286 | { | |
287 | if (exprNode_isDefined(c->generatingExpr) ) | |
288 | return (fileloc_copy (exprNode_getfileloc (c->generatingExpr) ) ); | |
289 | ||
290 | return (constraintExpr_getFileloc (c->lexpr) ); | |
291 | ||
292 | ||
293 | } | |
294 | ||
295 | static bool checkForMaxSet (constraint c) | |
296 | { | |
297 | if (constraintExpr_hasMaxSet(c->lexpr) || constraintExpr_hasMaxSet(c->expr) ) | |
298 | return TRUE; | |
299 | ||
300 | return FALSE; | |
301 | } | |
302 | ||
303 | bool constraint_hasMaxSet(constraint c) | |
304 | { | |
305 | if (checkForMaxSet(c) ) | |
306 | return TRUE; | |
307 | ||
308 | if (c->orig != NULL) | |
309 | { | |
310 | if (checkForMaxSet(c->orig) ) | |
311 | return TRUE; | |
312 | } | |
313 | ||
314 | return FALSE; | |
315 | } | |
316 | ||
317 | constraint constraint_makeReadSafeExprNode ( exprNode po, exprNode ind) | |
318 | { | |
319 | constraint ret = constraint_makeNew(); | |
320 | ||
321 | po = po; | |
322 | ind = ind; | |
323 | ret->lexpr = constraintExpr_makeMaxReadExpr(po); | |
324 | ret->ar = GTE; | |
325 | ret->expr = constraintExpr_makeValueExpr (ind); | |
326 | ret->post = FALSE; | |
327 | return ret; | |
328 | } | |
329 | ||
330 | constraint constraint_makeWriteSafeInt ( exprNode po, int ind) | |
331 | { | |
332 | constraint ret = constraint_makeNew(); | |
333 | ||
334 | ||
335 | ret->lexpr =constraintExpr_makeMaxSetExpr(po); | |
336 | ret->ar = GTE; | |
337 | ret->expr = constraintExpr_makeIntLiteral (ind); | |
338 | /*@i1*/return ret; | |
339 | } | |
340 | ||
341 | constraint constraint_makeSRefSetBufferSize (sRef s, long int size) | |
342 | { | |
343 | constraint ret = constraint_makeNew(); | |
344 | ret->lexpr = constraintExpr_makeSRefMaxset (s); | |
345 | ret->ar = EQ; | |
346 | ret->expr = constraintExpr_makeIntLiteral ((int)size); | |
347 | ret->post = TRUE; | |
348 | /*@i1*/return ret; | |
349 | } | |
350 | ||
351 | constraint constraint_makeSRefWriteSafeInt (sRef s, int ind) | |
352 | { | |
353 | constraint ret = constraint_makeNew(); | |
354 | ||
355 | ||
356 | ret->lexpr = constraintExpr_makeSRefMaxset ( s ); | |
357 | ret->ar = GTE; | |
358 | ret->expr = constraintExpr_makeIntLiteral (ind); | |
359 | ret->post = TRUE; | |
360 | /*@i1*/return ret; | |
361 | } | |
362 | ||
363 | /* drl added 01/12/2000 | |
364 | ||
365 | makes the constraint: Ensures index <= MaxRead(buffer) */ | |
366 | ||
367 | constraint constraint_makeEnsureLteMaxRead(exprNode index, exprNode buffer) | |
368 | { | |
369 | constraint ret = constraint_makeNew(); | |
370 | ||
371 | ret->lexpr = constraintExpr_makeValueExpr (index); | |
372 | ret->ar = LTE; | |
373 | ret->expr = constraintExpr_makeMaxReadExpr(buffer); | |
374 | ret->post = TRUE; | |
375 | return ret; | |
376 | } | |
377 | ||
378 | constraint constraint_makeWriteSafeExprNode (exprNode po, exprNode ind) | |
379 | { | |
380 | constraint ret = constraint_makeNew(); | |
381 | ||
382 | ||
383 | ret->lexpr =constraintExpr_makeMaxSetExpr(po); | |
384 | ret->ar = GTE; | |
385 | ret->expr = constraintExpr_makeValueExpr (ind); | |
386 | /*@i1*/return ret; | |
387 | } | |
388 | ||
389 | ||
390 | constraint constraint_makeReadSafeInt ( exprNode t1, int index) | |
391 | { | |
392 | constraint ret = constraint_makeNew(); | |
393 | ||
394 | ret->lexpr = constraintExpr_makeMaxReadExpr(t1); | |
395 | ret->ar = GTE; | |
396 | ret->expr = constraintExpr_makeIntLiteral (index); | |
397 | ret->post = FALSE; | |
398 | return ret; | |
399 | } | |
400 | ||
401 | constraint constraint_makeSRefReadSafeInt (sRef s, int ind) | |
402 | { | |
403 | constraint ret = constraint_makeNew(); | |
404 | ||
405 | ||
406 | ret->lexpr = constraintExpr_makeSRefMaxRead (s ); | |
407 | ret->ar = GTE; | |
408 | ret->expr = constraintExpr_makeIntLiteral (ind); | |
409 | ret->post = TRUE; | |
410 | /*@i1*/return ret; | |
411 | } | |
412 | ||
413 | constraint constraint_makeEnsureMaxReadAtLeast (exprNode t1, exprNode t2, fileloc sequencePoint) | |
414 | { | |
415 | constraint ret; | |
416 | ||
417 | ret = constraint_makeReadSafeExprNode(t1, t2); | |
418 | ret->lexpr = constraintExpr_setFileloc (ret->lexpr, sequencePoint); | |
419 | ret->post = TRUE; | |
420 | ||
421 | return ret; | |
422 | } | |
423 | ||
424 | static constraint constraint_makeEnsuresOpConstraintExpr (/*@only@*/ constraintExpr c1, /*@only@*/ constraintExpr c2, fileloc sequencePoint, arithType ar) | |
425 | { | |
426 | ||
427 | constraint ret; | |
428 | ||
429 | llassert(constraintExpr_isDefined(c1) && constraintExpr_isDefined(c2) ); | |
430 | ||
431 | ret = constraint_makeNew(); | |
432 | ||
433 | ret->lexpr = c1; | |
434 | ret->ar = ar; | |
435 | ret->post = TRUE; | |
436 | ret->expr = c2; | |
437 | ret->lexpr = constraintExpr_setFileloc (ret->lexpr, sequencePoint); | |
438 | return ret; | |
439 | } | |
440 | ||
441 | static constraint constraint_makeEnsuresOp (/*@dependent@*/ exprNode e1, /*@dependent@*/ exprNode e2, fileloc sequencePoint, arithType ar) | |
442 | { | |
443 | constraintExpr c1, c2; | |
444 | constraint ret; | |
445 | exprNode e; | |
446 | ||
447 | if (! (exprNode_isDefined(e1) && exprNode_isDefined(e2) ) ) | |
448 | { | |
449 | llcontbug((message("null exprNode, Exprnodes are %s and %s", | |
450 | exprNode_unparse(e1), exprNode_unparse(e2) ) | |
451 | )); | |
452 | } | |
453 | ||
454 | e = e1; | |
455 | c1 = constraintExpr_makeValueExpr (e); | |
456 | ||
457 | e = e2; | |
458 | c2 = constraintExpr_makeValueExpr (e); | |
459 | ||
460 | ret = constraint_makeEnsuresOpConstraintExpr (c1, c2, sequencePoint, ar); | |
461 | ||
462 | return ret; | |
463 | } | |
464 | ||
465 | ||
466 | /* make constraint ensures e1 == e2 */ | |
467 | ||
468 | constraint constraint_makeEnsureEqual (exprNode e1, exprNode e2, fileloc sequencePoint) | |
469 | { | |
470 | return ( constraint_makeEnsuresOp (e1, e2, sequencePoint, EQ) ); | |
471 | } | |
472 | ||
473 | /*make constraint ensures e1 < e2 */ | |
474 | constraint constraint_makeEnsureLessThan (exprNode e1, exprNode e2, fileloc sequencePoint) | |
475 | { | |
476 | constraintExpr t1, t2; | |
477 | ||
478 | t1 = constraintExpr_makeValueExpr (e1); | |
479 | t2 = constraintExpr_makeValueExpr (e2); | |
480 | ||
481 | /*change this to e1 <= (e2 -1) */ | |
482 | ||
483 | t2 = constraintExpr_makeDecConstraintExpr (t2); | |
484 | ||
485 | return ( constraint_makeEnsuresOpConstraintExpr (t1, t2, sequencePoint, LTE) ); | |
486 | } | |
487 | ||
488 | constraint constraint_makeEnsureLessThanEqual (exprNode e1, exprNode e2, fileloc sequencePoint) | |
489 | { | |
490 | return ( constraint_makeEnsuresOp (e1, e2, sequencePoint, LTE) ); | |
491 | } | |
492 | ||
493 | constraint constraint_makeEnsureGreaterThan (exprNode e1, exprNode e2, fileloc sequencePoint) | |
494 | { | |
495 | constraintExpr t1, t2; | |
496 | ||
497 | t1 = constraintExpr_makeValueExpr (e1); | |
498 | t2 = constraintExpr_makeValueExpr (e2); | |
499 | ||
500 | ||
501 | /* change this to e1 >= (e2 + 1) */ | |
502 | t2 = constraintExpr_makeIncConstraintExpr (t2); | |
503 | ||
504 | ||
505 | return ( constraint_makeEnsuresOpConstraintExpr (t1, t2, sequencePoint, GTE) ); | |
506 | } | |
507 | ||
508 | constraint constraint_makeEnsureGreaterThanEqual (exprNode e1, exprNode e2, fileloc sequencePoint) | |
509 | { | |
510 | return ( constraint_makeEnsuresOp (e1, e2, sequencePoint, GTE) ); | |
511 | } | |
512 | ||
513 | ||
514 | exprNode exprNode_copyConstraints (/*@returned@*/ exprNode dst, exprNode src) | |
515 | { | |
516 | constraintList_free(dst->ensuresConstraints); | |
517 | constraintList_free(dst->requiresConstraints); | |
518 | constraintList_free(dst->trueEnsuresConstraints); | |
519 | constraintList_free(dst->falseEnsuresConstraints); | |
520 | ||
521 | dst->ensuresConstraints = constraintList_copy (src->ensuresConstraints ); | |
522 | dst->requiresConstraints = constraintList_copy (src->requiresConstraints ); | |
523 | dst->trueEnsuresConstraints = constraintList_copy (src->trueEnsuresConstraints ); | |
524 | dst->falseEnsuresConstraints = constraintList_copy (src->falseEnsuresConstraints ); | |
525 | return dst; | |
526 | } | |
527 | ||
528 | /* Makes the constraint e = e + f */ | |
529 | constraint constraint_makeAddAssign (exprNode e, exprNode f, fileloc sequencePoint) | |
530 | { | |
531 | constraintExpr x1, x2, y; | |
532 | constraint ret; | |
533 | ||
534 | ret = constraint_makeNew(); | |
535 | ||
536 | x1 = constraintExpr_makeValueExpr (e); | |
537 | x2 = constraintExpr_copy(x1); | |
538 | y = constraintExpr_makeValueExpr (f); | |
539 | ||
540 | ret->lexpr = x1; | |
541 | ret->ar = EQ; | |
542 | ret->post = TRUE; | |
543 | ret->expr = constraintExpr_makeAddExpr (x2, y); | |
544 | ||
545 | ret->lexpr = constraintExpr_setFileloc (ret->lexpr, sequencePoint); | |
546 | ||
547 | return ret; | |
548 | } | |
549 | ||
550 | ||
551 | /* Makes the constraint e = e - f */ | |
552 | constraint constraint_makeSubtractAssign (exprNode e, exprNode f, fileloc sequencePoint) | |
553 | { | |
554 | constraintExpr x1, x2, y; | |
555 | constraint ret; | |
556 | ||
557 | ret = constraint_makeNew(); | |
558 | ||
559 | x1 = constraintExpr_makeValueExpr (e); | |
560 | x2 = constraintExpr_copy(x1); | |
561 | y = constraintExpr_makeValueExpr (f); | |
562 | ||
563 | ret->lexpr = x1; | |
564 | ret->ar = EQ; | |
565 | ret->post = TRUE; | |
566 | ret->expr = constraintExpr_makeSubtractExpr (x2, y); | |
567 | ||
568 | ret->lexpr = constraintExpr_setFileloc (ret->lexpr, sequencePoint); | |
569 | ||
570 | return ret; | |
571 | } | |
572 | ||
573 | constraint constraint_makeMaxSetSideEffectPostDecrement (exprNode e, fileloc sequencePoint) | |
574 | { | |
575 | constraint ret = constraint_makeNew(); | |
576 | ||
577 | ret->lexpr = constraintExpr_makeValueExpr (e); | |
578 | ret->ar = EQ; | |
579 | ret->post = TRUE; | |
580 | ret->expr = constraintExpr_makeValueExpr (e); | |
581 | ret->expr = constraintExpr_makeDecConstraintExpr (ret->expr); | |
582 | ret->lexpr = constraintExpr_setFileloc (ret->lexpr, sequencePoint); | |
583 | return ret; | |
584 | } | |
585 | constraint constraint_makeMaxSetSideEffectPostIncrement (exprNode e, fileloc sequencePoint) | |
586 | { | |
587 | constraint ret = constraint_makeNew(); | |
588 | ||
589 | ret->lexpr = constraintExpr_makeValueExpr (e); | |
590 | ret->ar = EQ; | |
591 | ret->post = TRUE; | |
592 | ret->expr = constraintExpr_makeValueExpr (e); | |
593 | ret->expr = constraintExpr_makeIncConstraintExpr (ret->expr); | |
594 | ||
595 | ret->lexpr = constraintExpr_setFileloc (ret->lexpr, sequencePoint); | |
596 | return ret; | |
597 | } | |
598 | ||
599 | ||
600 | void constraint_free (/*@only@*/ constraint c) | |
601 | { | |
602 | llassert(constraint_isDefined (c) ); | |
603 | ||
604 | ||
605 | if (constraint_isDefined(c->orig) ) | |
606 | constraint_free (c->orig); | |
607 | if ( constraint_isDefined(c->or) ) | |
608 | constraint_free (c->or); | |
609 | ||
610 | ||
611 | constraintExpr_free(c->lexpr); | |
612 | constraintExpr_free(c->expr); | |
613 | ||
614 | c->orig = NULL; | |
615 | c->or = NULL; | |
616 | c->lexpr = NULL; | |
617 | c->expr = NULL; | |
618 | ||
619 | free (c); | |
620 | ||
621 | } | |
622 | ||
623 | cstring arithType_print (arithType ar) /*@*/ | |
624 | { | |
625 | cstring st = cstring_undefined; | |
626 | switch (ar) | |
627 | { | |
628 | case LT: | |
629 | st = cstring_makeLiteral ("<"); | |
630 | break; | |
631 | case LTE: | |
632 | st = cstring_makeLiteral ("<="); | |
633 | break; | |
634 | case GT: | |
635 | st = cstring_makeLiteral (">"); | |
636 | break; | |
637 | case GTE: | |
638 | st = cstring_makeLiteral (">="); | |
639 | break; | |
640 | case EQ: | |
641 | st = cstring_makeLiteral ("=="); | |
642 | break; | |
643 | case NONNEGATIVE: | |
644 | st = cstring_makeLiteral ("NONNEGATIVE"); | |
645 | break; | |
646 | case POSITIVE: | |
647 | st = cstring_makeLiteral ("POSITIVE"); | |
648 | break; | |
649 | default: | |
650 | llassert(FALSE); | |
651 | break; | |
652 | } | |
653 | return st; | |
654 | } | |
655 | ||
656 | void constraint_printErrorPostCondition (constraint c, fileloc loc) | |
657 | { | |
658 | cstring string; | |
659 | fileloc errorLoc, temp; | |
660 | ||
661 | string = constraint_printDetailedPostCondition (c); | |
662 | ||
663 | errorLoc = loc; | |
664 | ||
665 | loc = NULL; | |
666 | ||
667 | temp = constraint_getFileloc(c); | |
668 | ||
669 | if (fileloc_isDefined(temp) ) | |
670 | { | |
671 | errorLoc = temp; | |
672 | voptgenerror ( FLG_CHECKPOST, string, errorLoc); | |
673 | fileloc_free(temp); | |
674 | } | |
675 | else | |
676 | { | |
677 | voptgenerror ( FLG_CHECKPOST, string, errorLoc); | |
678 | } | |
679 | } | |
680 | ||
681 | /*drl added 8-11-001*/ | |
682 | cstring constraint_printLocation (/*@observer@*/ /*@temp@*/ constraint c) /*@*/ | |
683 | { | |
684 | cstring string, ret; | |
685 | fileloc errorLoc; | |
686 | ||
687 | string = constraint_print(c); | |
688 | ||
689 | errorLoc = constraint_getFileloc(c); | |
690 | ||
691 | ret = message ("constraint: %q @ %q", string, fileloc_unparse(errorLoc) ); | |
692 | ||
693 | fileloc_free(errorLoc); | |
694 | return ret; | |
695 | ||
696 | } | |
697 | ||
698 | ||
699 | ||
700 | void constraint_printError (constraint c, fileloc loc) | |
701 | { | |
702 | cstring string; | |
703 | fileloc errorLoc, temp; | |
704 | ||
705 | ||
706 | /*drl 11/26/2001 avoid printing tautological constraints */ | |
707 | if (constraint_isAlwaysTrue(c) ) | |
708 | { | |
709 | return; | |
710 | } | |
711 | ||
712 | ||
713 | string = constraint_printDetailed (c); | |
714 | ||
715 | errorLoc = loc; | |
716 | ||
717 | temp = constraint_getFileloc(c); | |
718 | ||
719 | if (fileloc_isDefined(temp) ) | |
720 | { | |
721 | errorLoc = temp; | |
722 | } | |
723 | else | |
724 | { | |
725 | llassert(FALSE); | |
726 | DPRINTF (("constraint %s had undefined fileloc %s", constraint_print(c), fileloc_unparse(temp))); | |
727 | fileloc_free(temp); | |
728 | errorLoc = fileloc_copy(errorLoc); | |
729 | } | |
730 | ||
731 | if (c->post) | |
732 | { | |
733 | voptgenerror (FLG_FUNCTIONPOST, string, errorLoc); | |
734 | } | |
735 | else | |
736 | { | |
737 | if (constraint_hasMaxSet (c) ) | |
738 | voptgenerror (FLG_ARRAYBOUNDS, string, errorLoc); | |
739 | else | |
740 | voptgenerror (FLG_ARRAYBOUNDSREAD, string, errorLoc); | |
741 | } | |
742 | ||
743 | fileloc_free(errorLoc); | |
744 | ||
745 | } | |
746 | ||
747 | ||
748 | static cstring constraint_printDeep (constraint c) | |
749 | { | |
750 | cstring genExpr; | |
751 | cstring st = cstring_undefined; | |
752 | ||
753 | st = constraint_print(c); | |
754 | ||
755 | ||
756 | if (c->orig != constraint_undefined) | |
757 | { | |
758 | st = cstring_appendChar(st, '\n'); | |
759 | genExpr = exprNode_unparse(c->orig->generatingExpr); | |
760 | if (!c->post) | |
761 | { | |
762 | if (c->orig->fcnPre) | |
763 | st = cstring_concatFree(st, (message(" derived from %s precondition: %q", genExpr, constraint_printDeep(c->orig) ) | |
764 | ) ); | |
765 | else | |
766 | st = cstring_concatFree(st,(message(" needed to satisfy precondition:\n%q", | |
767 | constraint_printDeep(c->orig) ) | |
768 | ) ); | |
769 | ||
770 | } | |
771 | else | |
772 | { | |
773 | st = cstring_concatFree(st,(message("derived from: %q", | |
774 | constraint_printDeep(c->orig) ) | |
775 | ) ); | |
776 | } | |
777 | } | |
778 | ||
779 | return st; | |
780 | ||
781 | } | |
782 | ||
783 | ||
784 | static /*@only@*/ cstring constraint_printDetailedPostCondition (/*@observer@*/ /*@temp@*/ constraint c) | |
785 | { | |
786 | cstring st = cstring_undefined; | |
787 | cstring genExpr; | |
788 | ||
789 | st = message ("Unsatisfied ensures constraint condition:\nLCLint is unable to verify the constraint %q", constraint_printDeep (c) ); | |
790 | ||
791 | genExpr = exprNode_unparse (c->generatingExpr); | |
792 | ||
793 | if (context_getFlag (FLG_CONSTRAINTLOCATION) ) | |
794 | { | |
795 | cstring temp; | |
796 | ||
797 | temp = message ("\nOriginal Generating expression %q: %s\n", | |
798 | fileloc_unparse( exprNode_getfileloc (c->generatingExpr) ), | |
799 | genExpr ); | |
800 | st = cstring_concatFree (st, temp); | |
801 | ||
802 | if (constraint_hasMaxSet(c) ) | |
803 | { | |
804 | temp = message ("Has MaxSet\n"); | |
805 | st = cstring_concatFree (st, temp); | |
806 | } | |
807 | } | |
808 | return st; | |
809 | } | |
810 | ||
811 | cstring constraint_printDetailed (constraint c) | |
812 | { | |
813 | cstring st = cstring_undefined; | |
814 | cstring temp = cstring_undefined; | |
815 | cstring genExpr; | |
816 | ||
817 | if (!c->post) | |
818 | { | |
819 | st = message ("Unable to resolve constraint:\n%q", constraint_printDeep (c) ); | |
820 | } | |
821 | else | |
822 | { | |
823 | st = message ("Block Post condition:\nThis function block has the post condition %q", constraint_printDeep (c) ); | |
824 | } | |
825 | ||
826 | if (constraint_hasMaxSet(c) ) | |
827 | { | |
828 | temp = cstring_makeLiteral("Possible out-of-bounds store:\n"); | |
829 | } | |
830 | else | |
831 | { | |
832 | temp = cstring_makeLiteral("Possible out-of-bounds read:\n"); | |
833 | } | |
834 | ||
835 | genExpr = exprNode_unparse (c->generatingExpr); | |
836 | ||
837 | if (context_getFlag (FLG_CONSTRAINTLOCATION) ) | |
838 | { | |
839 | cstring temp2; | |
840 | temp2 = message ("%s\n", genExpr ); | |
841 | temp = cstring_concatFree (temp, temp2); | |
842 | } | |
843 | ||
844 | st = cstring_concatFree(temp,st); | |
845 | ||
846 | return st; | |
847 | } | |
848 | ||
849 | /*@only@*/ cstring constraint_print (constraint c) /*@*/ | |
850 | { | |
851 | cstring st = cstring_undefined; | |
852 | cstring type = cstring_undefined; | |
853 | llassert (c !=NULL); | |
854 | if (c->post) | |
855 | { | |
856 | if (context_getFlag (FLG_PARENCONSTRAINT) ) | |
857 | { | |
858 | type = cstring_makeLiteral ("ensures: "); | |
859 | } | |
860 | else | |
861 | { | |
862 | type = cstring_makeLiteral ("ensures"); | |
863 | } | |
864 | } | |
865 | else | |
866 | { | |
867 | if (context_getFlag (FLG_PARENCONSTRAINT) ) | |
868 | { | |
869 | type = cstring_makeLiteral ("requires: "); | |
870 | } | |
871 | else | |
872 | { | |
873 | type = cstring_makeLiteral ("requires"); | |
874 | } | |
875 | ||
876 | } | |
877 | if (context_getFlag (FLG_PARENCONSTRAINT) ) | |
878 | { | |
879 | st = message ("%q: %q %q %q", | |
880 | type, | |
881 | constraintExpr_print (c->lexpr), | |
882 | arithType_print(c->ar), | |
883 | constraintExpr_print(c->expr) | |
884 | ); | |
885 | } | |
886 | else | |
887 | { | |
888 | st = message ("%q %q %q %q", | |
889 | type, | |
890 | constraintExpr_print (c->lexpr), | |
891 | arithType_print(c->ar), | |
892 | constraintExpr_print(c->expr) | |
893 | ); | |
894 | } | |
895 | return st; | |
896 | } | |
897 | ||
898 | cstring constraint_printOr (constraint c) /*@*/ | |
899 | { | |
900 | cstring ret; | |
901 | constraint temp; | |
902 | ||
903 | ret = cstring_undefined; | |
904 | temp = c; | |
905 | ||
906 | ret = cstring_concatFree (ret, constraint_print(temp) ); | |
907 | ||
908 | temp = temp->or; | |
909 | ||
910 | while ( constraint_isDefined(temp) ) | |
911 | { | |
912 | ret = cstring_concatFree (ret, cstring_makeLiteral (" OR ") ); | |
913 | ret = cstring_concatFree (ret, constraint_print(temp) ); | |
914 | temp = temp->or; | |
915 | } | |
916 | ||
917 | return ret; | |
918 | ||
919 | } | |
920 | ||
921 | /*@only@*/ constraint constraint_doSRefFixBaseParam (/*@returned@*/ /*@only@*/ constraint precondition, | |
922 | exprNodeList arglist) | |
923 | { | |
924 | precondition->lexpr = constraintExpr_doSRefFixBaseParam (precondition->lexpr, | |
925 | arglist); | |
926 | precondition->expr = constraintExpr_doSRefFixBaseParam (precondition->expr, | |
927 | arglist); | |
928 | ||
929 | return precondition; | |
930 | } | |
931 | ||
932 | ||
933 | constraint constraint_doFixResult (constraint postcondition, /*@dependent@*/ exprNode fcnCall) | |
934 | { | |
935 | postcondition = constraint_copy (postcondition); | |
936 | postcondition->lexpr = constraintExpr_doFixResult (postcondition->lexpr, fcnCall); | |
937 | postcondition->expr = constraintExpr_doFixResult (postcondition->expr, fcnCall); | |
938 | ||
939 | return postcondition; | |
940 | } | |
941 | ||
942 | /*@only@*/ constraint constraint_doSRefFixConstraintParam (constraint precondition, | |
943 | exprNodeList arglist) | |
944 | { | |
945 | ||
946 | precondition = constraint_copy (precondition); | |
947 | precondition->lexpr = constraintExpr_doSRefFixConstraintParam (precondition->lexpr, arglist); | |
948 | precondition->expr = constraintExpr_doSRefFixConstraintParam (precondition->expr, arglist); | |
949 | ||
950 | precondition->fcnPre = FALSE; | |
951 | return precondition; | |
952 | } | |
953 | ||
954 | constraint constraint_preserveOrig (/*@returned@*/ constraint c) /*@modifies c @*/ | |
955 | { | |
956 | ||
957 | DPRINTF( (message("Doing constraint_preserverOrig for %q ", constraint_printDetailed(c) ) )); | |
958 | ||
959 | if (c->orig == constraint_undefined) | |
960 | c->orig = constraint_copy (c); | |
961 | ||
962 | else if (c->orig->fcnPre) | |
963 | { | |
964 | constraint temp; | |
965 | ||
966 | temp = c->orig; | |
967 | ||
968 | /* avoid infinite loop */ | |
969 | c->orig = NULL; | |
970 | c->orig = constraint_copy (c); | |
971 | if (c->orig->orig == NULL) | |
972 | { | |
973 | c->orig->orig = temp; | |
974 | temp = NULL; | |
975 | } | |
976 | else | |
977 | { | |
978 | llcontbug((message("Expected c->orig->orig to be null" ) )); | |
979 | constraint_free(c->orig->orig); | |
980 | c->orig->orig = temp; | |
981 | temp = NULL; | |
982 | } | |
983 | } | |
984 | else | |
985 | { | |
986 | DPRINTF( (message("Not changing constraint") )); | |
987 | } | |
988 | ||
989 | DPRINTF( (message("After Doing constraint_preserverOrig for %q ", constraint_printDetailed(c) ) )); | |
990 | ||
991 | return c; | |
992 | } | |
993 | /*@=fcnuse*/ | |
994 | /*@=assignexpose*/ | |
995 | /*@=czechfcns@*/ | |
996 | ||
997 | ||
998 | constraint constraint_togglePost (/*@returned@*/ constraint c) | |
999 | { | |
1000 | c->post = !c->post; | |
1001 | return c; | |
1002 | } | |
1003 | ||
1004 | constraint constraint_togglePostOrig (/*@returned@*/ constraint c) | |
1005 | { | |
1006 | if (c->orig != NULL) | |
1007 | c->orig = constraint_togglePost(c->orig); | |
1008 | return c; | |
1009 | } | |
1010 | ||
1011 | bool constraint_hasOrig( /*@observer@*/ /*@temp@*/ constraint c) | |
1012 | { | |
1013 | if (c->orig == NULL) | |
1014 | return FALSE; | |
1015 | else | |
1016 | return TRUE; | |
1017 | } | |
1018 | ||
1019 | ||
1020 | constraint constraint_undump (FILE *f) | |
1021 | { | |
1022 | constraint c; | |
1023 | bool fcnPre; | |
1024 | bool post; | |
1025 | arithType ar; | |
1026 | ||
1027 | constraintExpr lexpr; | |
1028 | constraintExpr expr; | |
1029 | ||
1030 | ||
1031 | char * s; | |
1032 | ||
1033 | char *os; | |
1034 | ||
1035 | os = mstring_create (MAX_DUMP_LINE_LENGTH); | |
1036 | ||
1037 | s = fgets(os, MAX_DUMP_LINE_LENGTH, f); | |
1038 | ||
1039 | /*@i33*/ /*this should probably be wrappered...*/ | |
1040 | ||
1041 | fcnPre = (bool) reader_getInt (&s); | |
1042 | advanceField(&s); | |
1043 | post = (bool) reader_getInt (&s); | |
1044 | advanceField(&s); | |
1045 | ar = (arithType) reader_getInt (&s); | |
1046 | ||
1047 | s = fgets(os, MAX_DUMP_LINE_LENGTH, f); | |
1048 | ||
1049 | reader_checkChar (&s, 'l'); | |
1050 | ||
1051 | lexpr = constraintExpr_undump (f); | |
1052 | ||
1053 | s = fgets(os, MAX_DUMP_LINE_LENGTH, f); | |
1054 | ||
1055 | reader_checkChar (&s, 'r'); | |
1056 | expr = constraintExpr_undump (f); | |
1057 | ||
1058 | c = constraint_makeNew(); | |
1059 | ||
1060 | c->fcnPre = fcnPre; | |
1061 | c->post = post; | |
1062 | c->ar = ar; | |
1063 | ||
1064 | c->lexpr = lexpr; | |
1065 | c->expr = expr; | |
1066 | ||
1067 | free(os); | |
1068 | c = constraint_preserveOrig(c); | |
1069 | return c; | |
1070 | } | |
1071 | ||
1072 | ||
1073 | void constraint_dump (/*@observer@*/ constraint c, FILE *f) | |
1074 | { | |
1075 | bool fcnPre; | |
1076 | bool post; | |
1077 | arithType ar; | |
1078 | ||
1079 | constraintExpr lexpr; | |
1080 | constraintExpr expr; | |
1081 | ||
1082 | ||
1083 | fcnPre = c->fcnPre; | |
1084 | post = c->post; | |
1085 | ar = c->ar; | |
1086 | lexpr = c->lexpr; | |
1087 | expr = c->expr; | |
1088 | ||
1089 | fprintf(f, "%d@%d@%d\n", (int) fcnPre, (int) post, (int) ar); | |
1090 | fprintf(f,"l\n"); | |
1091 | constraintExpr_dump (lexpr, f); | |
1092 | fprintf(f,"r\n"); | |
1093 | constraintExpr_dump (expr, f); | |
1094 | } | |
1095 | ||
1096 | ||
1097 | int constraint_compare (/*@observer@*/ /*@temp@*/ const constraint * c1, /*@observer@*/ /*@temp@*/ const constraint * c2) /*@*/ | |
1098 | { | |
1099 | fileloc loc1, loc2; | |
1100 | ||
1101 | int ret; | |
1102 | ||
1103 | llassert(constraint_isDefined(*c1) ); | |
1104 | llassert(constraint_isDefined(*c2) ); | |
1105 | ||
1106 | if (constraint_isUndefined(*c1) ) | |
1107 | { | |
1108 | if (constraint_isUndefined(*c2) ) | |
1109 | return 0; | |
1110 | else | |
1111 | return 1; | |
1112 | } | |
1113 | ||
1114 | if (constraint_isUndefined(*c2) ) | |
1115 | { | |
1116 | return -1; | |
1117 | } | |
1118 | ||
1119 | loc1 = constraint_getFileloc(*c1); | |
1120 | loc2 = constraint_getFileloc(*c2); | |
1121 | ||
1122 | ret = fileloc_compare(loc1, loc2); | |
1123 | ||
1124 | fileloc_free(loc1); | |
1125 | fileloc_free(loc2); | |
1126 | ||
1127 | return ret; | |
1128 | } | |
1129 | ||
1130 | ||
1131 | bool constraint_isPost (/*@observer@*/ /*@temp@*/ constraint c) | |
1132 | { | |
1133 | llassert(constraint_isDefined(c) ); | |
1134 | ||
1135 | if (constraint_isUndefined(c) ) | |
1136 | return FALSE; | |
1137 | ||
1138 | return (c->post); | |
1139 | } | |
1140 | ||
1141 | ||
1142 | static int constraint_getDepth(/*@observer@*/ /*@temp@*/ constraint c) | |
1143 | { | |
1144 | int l , r; | |
1145 | ||
1146 | l = constraintExpr_getDepth(c->lexpr); | |
1147 | r = constraintExpr_getDepth(c->expr); | |
1148 | ||
1149 | if (l > r) | |
1150 | { | |
1151 | DPRINTF(( message("constraint depth returning %d for %s", l, constraint_print(c) ) )); | |
1152 | return l; | |
1153 | } | |
1154 | else | |
1155 | { | |
1156 | DPRINTF(( message("constraint depth returning %d for %s", r, constraint_print(c) ) )); | |
1157 | return r; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | ||
1162 | bool constraint_tooDeep (/*@observer@*/ /*@temp@*/ constraint c) | |
1163 | { | |
1164 | int temp; | |
1165 | ||
1166 | temp = constraint_getDepth(c); | |
1167 | ||
1168 | if (temp >= 20 ) | |
1169 | { | |
1170 | return TRUE; | |
1171 | } | |
1172 | ||
1173 | return FALSE; | |
1174 | ||
1175 | } |