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Passes the standard LCLint test suite. YAAAAAAYYYY!!!!!
[splint.git] / src / exprNode.c
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885824d3 1/*
2** LCLint - annotation-assisted static program checker
3** Copyright (C) 1994-2000 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** exprNode.c
26*/
27
28# include <ctype.h> /* for isdigit */
29# include "lclintMacros.nf"
30# include "basic.h"
31# include "cgrammar.h"
32# include "cgrammar_tokens.h"
33
34# include "exprChecks.h"
35# include "aliasChecks.h"
36# include "exprNodeSList.h"
37# include "exprData.i"
38
39static bool exprNode_isEmptyStatement (exprNode p_e);
40static /*@exposed@*/ exprNode exprNode_firstStatement (/*@returned@*/ exprNode p_e);
41static bool exprNode_isFalseConstant (exprNode p_e) /*@*/ ;
42static bool exprNode_isBlock (exprNode p_e);
43static void checkGlobUse (uentry p_glob, bool p_isCall, /*@notnull@*/ exprNode p_e);
44static void exprNode_addUse (exprNode p_e, sRef p_s);
45static bool exprNode_matchArgType (ctype p_ct, exprNode p_e);
4cccc6ad 46 exprNode exprNode_fakeCopy (exprNode p_e) /*@*/ ;
47static exprNode exprNode_statementError (/*@only@*/ exprNode p_e, /*@only@*/ lltok p_t);
885824d3 48static bool exprNode_matchTypes (exprNode p_e1, exprNode p_e2);
49static void checkUniqueParams (exprNode p_fcn,
50 /*@notnull@*/ exprNode p_current, exprNodeList p_args,
51 int p_paramno, uentry p_ucurrent);
52static void updateAliases (/*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2);
53static void abstractOpError (ctype p_tr1, ctype p_tr2, lltok p_op,
54 /*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2,
55 fileloc p_loc1, fileloc p_loc2);
56static ctype checkNumerics (ctype p_tr1, ctype p_tr2, ctype p_te1, ctype p_te2,
57 /*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2, lltok p_op);
58static void doAssign (/*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2, bool p_isInit);
59static void checkSafeUse (exprNode p_e, sRef p_s);
60static void reflectNullTest (/*@notnull@*/ exprNode p_e, bool p_isnull);
61static void checkMacroParen (exprNode p_e);
62static exprNodeSList exprNode_flatten (/*@dependent@*/ exprNode p_e);
63static void exprNode_checkSetAny (exprNode p_e, /*@dependent@*/ cstring p_name);
64static void exprNode_checkUse (exprNode p_e, sRef p_s, fileloc p_loc);
65static void exprNode_mergeUSs (exprNode p_res, exprNode p_other);
66static void exprNode_mergeCondUSs (exprNode p_res, exprNode p_other1, exprNode p_other2);
67static /*@only@*/ /*@notnull@*/ exprNode exprNode_fromIdentifierAux (/*@observer@*/ uentry p_c);
68static void checkAnyCall (/*@notnull@*/ /*@dependent@*/ exprNode p_fcn,
69 /*@dependent@*/ cstring p_fname,
70 uentryList p_pn, exprNodeList p_args,
71 bool p_hasMods, sRefSet p_mods, bool p_isSpec,
72 int p_specialArgs);
73static void checkOneArg (uentry p_ucurrent, /*@notnull@*/ exprNode p_current,
74 /*@dependent@*/ exprNode p_fcn, bool p_isSpec, int p_argno, int p_totargs);
75static void
76 checkUnspecCall (/*@notnull@*/ /*@dependent@*/ exprNode p_fcn, uentryList p_params, exprNodeList p_args);
77
78static /*@only@*/ exprNode exprNode_effect (exprNode p_e)
79 /*@globals internalState@*/ ;
80static /*@only@*/ cstring exprNode_doUnparse (exprNode p_e);
81static /*@observer@*/ cstring exprNode_rootVarName (exprNode p_e);
82static /*@exposed@*/ exprNode
83 exprNode_lastStatement (/*@returned@*/ exprNode p_e);
84
85static /*@null@*/ sRef defref = sRef_undefined;
86static /*@only@*/ exprNode mustExitNode = exprNode_undefined;
87
88static int checkArgsReal (uentry p_fcn, /*@dependent@*/ exprNode p_f,
89 uentryList p_cl,
90 exprNodeList p_args, bool p_isIter, exprNode p_ret);
91
92static bool inEffect = FALSE;
93static int nowalloc = 0;
94static int totalloc = 0;
95static int maxalloc = 0;
96
97static /*@only@*/ uentry regArg;
98static /*@only@*/ uentry outArg;
99static /*@only@*/ uentry outStringArg;
100static /*@exposed@*/ sRef stdinRef;
101static /*@exposed@*/ sRef stdoutRef;
102static /*@only@*/ uentry csArg;
103static /*@only@*/ uentry csOnlyArg;
104static ctype cstringType;
105static ctype ctypeType;
106static ctype filelocType;
107static bool initMod = FALSE;
108
109/*
110** must occur after library has been read
111*/
112
113void exprNode_initMod (void)
114 /*@globals undef regArg, undef outArg, undef outStringArg,
115 undef csOnlyArg, undef csArg;
116 @*/
117{
118 uentry ue;
119 idDecl tmp;
120
121 initMod = TRUE;
122 cstringType = ctype_unknown;
123 ctypeType = ctype_unknown;
124 filelocType = ctype_unknown;
125
126 defref = sRef_undefined;
127
128 if (usymtab_existsType (cstring_makeLiteralTemp ("cstring")))
129 {
130 cstringType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("cstring"));
131 }
132
133 if (usymtab_existsType (cstring_makeLiteralTemp ("ctype")))
134 {
135 ctypeType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("ctype"));
136 }
137
138 if (usymtab_existsType (cstring_makeLiteralTemp ("fileloc")))
139 {
140 filelocType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("fileloc"));
141 }
142
143 if (usymtab_existsGlob (cstring_makeLiteralTemp ("stdin")))
144 {
145 ue = usymtab_lookupGlob (cstring_makeLiteralTemp ("stdin"));
146 }
147 else /* define stdin */
148 {
149 ue = uentry_makeVariable (cstring_makeLiteralTemp ("stdin"),
150 ctype_unknown,
151 fileloc_getBuiltin (),
152 FALSE);
153 uentry_setHasNameError (ue);
154 ue = usymtab_supGlobalEntryReturn (ue);
155 }
156
157 stdinRef = sRef_makePointer (uentry_getSref (ue));
158
159 if (usymtab_existsGlob (cstring_makeLiteralTemp ("stdout")))
160 {
161 ue = usymtab_lookupGlob (cstring_makeLiteralTemp ("stdout"));
162 }
163 else
164 {
165 ue = uentry_makeVariable (cstring_makeLiteralTemp ("stdout"),
166 ctype_unknown,
167 fileloc_getBuiltin (),
168 FALSE);
169 uentry_setHasNameError (ue);
170 ue = usymtab_supGlobalEntryReturn (ue);
171 }
172
173 stdoutRef = sRef_makePointer (uentry_getSref (ue));
174
175 tmp = idDecl_create (cstring_undefined, qtype_create (ctype_unknown));
176
177 regArg = uentry_makeParam (tmp, PARAMUNKNOWN);
178
179 idDecl_setTyp (tmp,
180 qtype_addQual (qtype_create (ctype_makePointer (ctype_unknown)),
181 qual_createOut ()));
182
183 outArg = uentry_makeParam (tmp, PARAMUNKNOWN);
184
185 idDecl_setTyp (tmp, qtype_addQual (qtype_create (ctype_string),
186 qual_createOut ()));
187
188 outStringArg = uentry_makeParam (tmp, PARAMUNKNOWN);
189
190 idDecl_setTyp (tmp, qtype_addQual (qtype_addQual (qtype_create (cstringType),
191 qual_createOnly ()),
192 qual_createNull ()));
193
194 csOnlyArg = uentry_makeParam (tmp, PARAMUNKNOWN);
195
196 idDecl_setTyp (tmp, qtype_addQual (qtype_create (cstringType), qual_createNull ()));
197 csArg = uentry_makeParam (tmp, PARAMUNKNOWN);
198
199 idDecl_free (tmp);
200}
201
202void
203exprNode_destroyMod (void)
204 /*@globals killed regArg, killed outArg, killed outStringArg,
205 killed mustExitNode, initMod @*/
206{
207 if (initMod)
208 {
209 uentry_free (regArg);
210 uentry_free (outArg);
211 uentry_free (outStringArg);
212
213 exprNode_free (mustExitNode);
214 initMod = FALSE;
215 /*@-branchstate@*/
216 }
217 /*@=branchstate@*/
218}
219
220static void exprNode_resetSref (/*@notnull@*/ exprNode e)
221{
222 e->sref = defref;
223}
224
4cccc6ad 225exprNode exprNode_fakeCopy (exprNode e)
885824d3 226{
227 /*@-temptrans@*/ /*@-retalias@*/
228 return e;
229 /*@=temptrans@*/ /*@=retalias@*/
230}
231
232static bool isFlagKey (char key)
233{
234 return (key == '-' || key == '+' || key == ' ' || key == '#');
235}
236
237static void exprNode_combineControl (/*@notnull@*/ exprNode ret,
238 /*@notnull@*/ exprNode ifclause,
239 /*@notnull@*/ exprNode elseclause)
240{
241 ret->canBreak = ifclause->canBreak || elseclause->canBreak;
242
243 ret->mustBreak =
244 (ifclause->mustBreak || exprNode_mustEscape (ifclause))
245 && (elseclause->mustBreak || exprNode_mustEscape (elseclause));
246
247 ret->exitCode = exitkind_combine (ifclause->exitCode,
248 elseclause->exitCode);
249
250}
251
252/*
253** For exprNode's returned by exprNode_effect.
254*/
255
256static bool shallowKind (exprKind kind)
257{
258 return (kind == XPR_STRINGLITERAL
259 || kind == XPR_NUMLIT
260 || kind == XPR_EMPTY
261 || kind == XPR_BODY
262 || kind == XPR_NODE);
263}
264
265static void
266exprNode_freeIniter (/*@only@*/ exprNode e)
267{
268 if (!exprNode_isError (e))
269 {
270 switch (e->kind)
271 {
272 case XPR_FACCESS:
273 sfree (e->edata->field);
274 sfree (e->edata);
275 break;
276 case XPR_FETCH:
277 exprNode_free (e->edata->op->b);
278 /*@-compdestroy@*/ sfree (e->edata->op); /*@=compdestroy@*/
279 sfree (e->edata);
280 break;
281 default:
282 llbug (message ("other: %s", exprNode_unparse (e)));
283 }
284
285 multiVal_free (e->val);
286 cstring_free (e->etext);
287 fileloc_free (e->loc);
288 sRefSet_free (e->uses);
289 sRefSet_free (e->sets);
290 sRefSet_free (e->msets);
291 guardSet_free (e->guards);
292 sfree (e);
293 }
294}
295
296void
297exprNode_freeShallow (/*@only@*/ exprNode e)
298{
299 if (!exprNode_isError (e))
300 {
301 if (shallowKind (e->kind))
302 {
303 }
304 else
305 {
306 if (!inEffect)
307 {
308 if (e->kind == XPR_EMPTY
309 || e->kind == XPR_BODY
310 || e->kind == XPR_STRINGLITERAL
311 || e->kind == XPR_NUMLIT
312 || e->kind == XPR_NODE
313 || e->kind == XPR_OFFSETOF
314 || e->kind == XPR_ALIGNOFT
315 || e->kind == XPR_ALIGNOF
316 || e->kind == XPR_SIZEOFT
317 || e->kind == XPR_SIZEOF)
318 {
319 /* don't free anything */
320 }
321 else
322 {
323 /* multiVal_free (e->val); */
324 cstring_free (e->etext);
325 fileloc_free (e->loc);
326 sRefSet_free (e->uses);
327 sRefSet_free (e->sets);
328 sRefSet_free (e->msets);
329 guardSet_free (e->guards);
330 exprData_freeShallow (e->edata, e->kind);
331 nowalloc--;
332 /*@-compdestroy@*/ sfree (e); /*@=compdestroy@*/
333 /*@-branchstate@*/
334 }
335 }
336 } /*@=branchstate@*/
337 }
338 }
339
340void
341exprNode_free (exprNode e)
342{
343 if (!exprNode_isError (e))
344 {
345 if (!inEffect)
346 {
347 multiVal_free (e->val);
348 cstring_free (e->etext);
349 fileloc_free (e->loc);
350 sRefSet_free (e->uses);
351 sRefSet_free (e->sets);
352 sRefSet_free (e->msets);
353 guardSet_free (e->guards);
354 exprData_free (e->edata, e->kind);
355
356 nowalloc--;
357 sfree (e);
358 /*@-branchstate@*/
359 } /*@=branchstate@*/
360 }
361}
362
363exprNode
364exprNode_makeError ()
365{
366 return exprNode_undefined;
367}
368
369static /*@out@*/ /*@only@*/ /*@notnull@*/ exprNode
370exprNode_new (void)
371{
372 exprNode ret = (exprNode) dmalloc (sizeof (*ret));
373 /* static int lastexpnodes = 0; */
374
375 nowalloc++;
376 totalloc++;
377
378 if (nowalloc > maxalloc)
379 {
380 maxalloc = nowalloc;
381 }
382
383 return ret;
384}
385
386static /*@notnull@*/ /*@special@*/ exprNode
387 exprNode_createPlain (ctype c)
388 /*@defines result@*/
389 /*@post:isnull result->edata, result->loc, result->val, result->guards,
390 result->uses, result->sets, result->msets, result->etext @*/
391 /*@*/
392{
393 exprNode e = exprNode_new ();
394
395 e->typ = c;
396 e->kind = XPR_EMPTY;
397 e->val = multiVal_undefined;
398 e->sref = defref;
399 e->etext = cstring_undefined;
400 e->loc = fileloc_undefined;
401 e->guards = guardSet_undefined;
402 e->uses = sRefSet_undefined;
403 e->sets = sRefSet_undefined;
404 e->msets = sRefSet_undefined;
405 e->edata = exprData_undefined;
406 e->exitCode = XK_NEVERESCAPE;
407 e->canBreak = FALSE;
408 e->mustBreak = FALSE;
409 e->isJumpPoint = FALSE;
a0a162cd 410 e->environment = environmentTable_undefined;
361091cc 411 e->requiresConstraints = constraintList_new();
412 e->ensuresConstraints = constraintList_new();
413
885824d3 414 return (e);
415}
416
417/*@observer@*/ exprNode exprNode_makeMustExit (void)
418{
419 if (exprNode_isUndefined (mustExitNode))
420 {
421 mustExitNode = exprNode_createPlain (ctype_unknown);
422 mustExitNode->exitCode = XK_MUSTEXIT;
423 }
424
425 return mustExitNode;
426}
427
428
429static /*@notnull@*/ /*@special@*/ exprNode exprNode_create (ctype c)
430 /*@defines result@*/
431 /*@post:isnull result->edata, result->guards, result->val,
432 result->uses, result->sets, result->msets@*/
433 /*@*/
434{
435 exprNode e = exprNode_createPlain (c);
436 e->loc = fileloc_copy (g_currentloc);
437 return (e);
438}
439
440static /*@notnull@*/ /*@special@*/ exprNode exprNode_createUnknown (void)
441 /*@defines result@*/
442 /*@post:isnull result->edata, result->guards,
443 result->uses, result->sets, result->msets@*/
444 /*@*/
445{
446 return (exprNode_create (ctype_unknown));
447}
448
449static /*@notnull@*/ /*@special@*/ exprNode
450 exprNode_createLoc (ctype c, /*@keep@*/ fileloc loc)
451 /*@defines result@*/
452 /*@post:isnull result->edata, result->guards, result->val,
453 result->uses, result->sets, result->msets@*/
454 /*@*/
455{
456 exprNode e = exprNode_createPlain (c);
457 e->loc = loc;
458 return (e);
459}
460
461static void
462 exprNode_copySets (/*@special@*/ /*@notnull@*/ exprNode ret, exprNode e)
463 /*@defines ret->guards, ret->uses, ret->sets, ret->msets@*/
464{
465 if (exprNode_isDefined (e))
466 {
467 ret->guards = guardSet_copy (e->guards);
468 ret->uses = sRefSet_newCopy (e->uses);
469 ret->sets = sRefSet_newCopy (e->sets);
470 ret->msets = sRefSet_newCopy (e->msets);
471 }
472 else
473 {
474 ret->guards = guardSet_undefined;
475 ret->uses = sRefSet_undefined;
476 ret->sets = sRefSet_undefined;
477 ret->msets = sRefSet_undefined;
478 }
479}
480
481static /*@notnull@*/ /*@special@*/ exprNode
482 exprNode_createPartialLocCopy (exprNode e, /*@only@*/ fileloc loc)
483 /*@defines result@*/
484 /*@post:isnull result->edata, result->etext@*/
485 /*@*/
486{
487 exprNode ret = exprNode_new ();
488
489 if (exprNode_isError (e))
490 {
491 ret->typ = ctype_unknown;
492 ret->val = multiVal_undefined;
493 ret->loc = loc;
494 ret->guards = guardSet_undefined;
495 ret->uses = sRefSet_undefined;
496 ret->sets = sRefSet_undefined;
497 ret->msets = sRefSet_undefined;
498 }
499 else
500 {
501 ret->typ = e->typ;
502 ret->val = multiVal_copy (e->val);
503 ret->loc = loc;
504 ret->guards = guardSet_copy (e->guards);
505 ret->uses = sRefSet_newCopy (e->uses);
506 ret->sets = sRefSet_newCopy (e->sets);
507 ret->msets = sRefSet_newCopy (e->msets);
508 }
509
510 ret->kind = XPR_EMPTY;
511 ret->sref = defref;
512 ret->etext = cstring_undefined;
513 ret->exitCode = XK_NEVERESCAPE;
514 ret->canBreak = FALSE;
515 ret->mustBreak = FALSE;
516 ret->isJumpPoint = FALSE;
517 ret->edata = exprData_undefined;
518
519 return (ret);
520}
521
522
523static /*@notnull@*/ /*@special@*/ exprNode
524 exprNode_createPartialCopy (exprNode e)
525 /*@defines result@*/
526 /*@post:isnull result->edata, result->etext@*/
527 /*@*/
528{
529 return (exprNode_createPartialLocCopy (e, fileloc_copy (exprNode_loc (e))));
530}
531
532static /*@notnull@*/ /*@special@*/ exprNode
533 exprNode_createPartialNVCopy (exprNode e)
534 /*@defines result@*/
535 /*@post:isnull result->edata, result->etext, result->val @*/
536 /*@*/
537{
538 exprNode ret = exprNode_new ();
539
540 if (exprNode_isError (e))
541 {
542 ret->typ = ctype_unknown;
543 ret->loc = fileloc_undefined;
544 ret->guards = guardSet_undefined;
545 ret->uses = sRefSet_undefined;
546 ret->sets = sRefSet_undefined;
547 ret->msets = sRefSet_undefined;
548 }
549 else
550 {
551 ret->typ = e->typ;
552 ret->loc = fileloc_copy (e->loc);
553 ret->guards = guardSet_copy (e->guards);
554 ret->uses = sRefSet_newCopy (e->uses);
555 ret->sets = sRefSet_newCopy (e->sets);
556 ret->msets = sRefSet_newCopy (e->msets);
557 }
558
559 ret->val = multiVal_undefined;
560 ret->kind = XPR_EMPTY;
561 ret->sref = defref;
562 ret->etext = cstring_undefined;
563 ret->exitCode = XK_NEVERESCAPE;
564 ret->canBreak = FALSE;
565 ret->mustBreak = FALSE;
566 ret->isJumpPoint = FALSE;
567 ret->edata = exprData_undefined;
568
569 return (ret);
570}
571
572static /*@notnull@*/ /*@special@*/ exprNode
573 exprNode_createSemiCopy (exprNode e)
574 /*@defines result@*/
575 /*@post:isnull result->edata, result->etext, result->sets,
576 result->msets, result->uses, result->guards@*/
577 /*@*/
578{
579 if (exprNode_isError (e))
580 {
581 return exprNode_createPlain (ctype_unknown);
582 }
583 else
584 {
585 exprNode ret = exprNode_new ();
586
587 ret->typ = e->typ;
588 ret->val = multiVal_copy (e->val);
589 ret->loc = fileloc_copy (e->loc);
590 ret->guards = guardSet_undefined;
591 ret->uses = sRefSet_undefined;
592 ret->sets = sRefSet_undefined;
593 ret->msets = sRefSet_undefined;
594
595 ret->kind = XPR_EMPTY;
596 ret->sref = defref;
597 ret->etext = cstring_undefined;
598 ret->exitCode = XK_NEVERESCAPE;
599 ret->canBreak = FALSE;
600 ret->mustBreak = FALSE;
601 ret->isJumpPoint = FALSE;
602 ret->edata = exprData_undefined;
603
604 return (ret);
605 }
606}
607
608bool
609exprNode_isNullValue (exprNode e)
610{
611 if (exprNode_isDefined (e))
612 {
613 multiVal m = exprNode_getValue (e);
614
615 if (multiVal_isInt (m))
616 {
617 return (multiVal_forceInt (m) == 0);
618 }
619 }
620
621 return FALSE;
622}
623
624static bool
625exprNode_isUnknownConstant (/*@notnull@*/ exprNode e)
626{
627 while (e->kind == XPR_PARENS)
628 {
629 e = exprData_getUopNode (e->edata);
630 llassert (exprNode_isDefined (e));
631 }
632
633 if (e->kind == XPR_CONST)
634 {
635 multiVal m = exprNode_getValue (e);
636
637 if (multiVal_isUnknown (m))
638 {
639 return TRUE;
640 }
641 }
642
643 return FALSE;
644}
645
646/*@only@*/ exprNode
647 exprNode_numLiteral (ctype c, /*@temp@*/ cstring t,
648 /*@only@*/ fileloc loc, long val)
649{
650 exprNode e = exprNode_createLoc (c, loc);
651
652 e->kind = XPR_NUMLIT;
653
654 llassert (multiVal_isUndefined (e->val));
655 e->val = multiVal_makeInt (val);
656 e->edata = exprData_makeLiteral (cstring_copy (t));
657
658 if (val == 0)
659 {
660 e->sref = sRef_makeUnknown ();
661 sRef_setDefNull (e->sref, e->loc);
662 }
663
664 DPRINTF (("Num lit: %s / %s", exprNode_unparse (e), ctype_unparse (exprNode_getType (e))));
665 return (e);
666}
667
668/*@only@*/ exprNode
669exprNode_charLiteral (char c, cstring text, /*@only@*/ fileloc loc)
670{
671 exprNode e = exprNode_createLoc (ctype_char, loc);
672
673 if (context_getFlag (FLG_CHARINTLITERAL))
674 {
675 e->typ = ctype_makeConj (ctype_char, ctype_int);
676 }
677
678 e->kind = XPR_NUMLIT;
679 e->val = multiVal_makeChar (c);
680
681 e->edata = exprData_makeLiteral (cstring_copy (text));
682 return (e);
683}
684
685/*@only@*/ exprNode
686exprNode_floatLiteral (double d, ctype ct, cstring text, /*@only@*/ fileloc loc)
687{
688 exprNode e = exprNode_createLoc (ct, loc);
689
690 e->kind = XPR_NUMLIT;
691 e->val = multiVal_makeDouble (d);
692 e->edata = exprData_makeLiteral (cstring_copy (text));
693 return (e);
694}
695
696multiVal exprNode_getValue (exprNode e)
697{
698 while (exprNode_isInParens (e)) {
699 if (e->edata != NULL) {
700 e = exprData_getUopNode (e->edata);
701 } else {
702 break;
703 }
704 }
705
706 if (exprNode_isDefined (e)) {
707 return e->val;
708 } else {
709 return multiVal_undefined;
710 }
711}
712
713/*@only@*/ exprNode
714exprNode_stringLiteral (/*@only@*/ cstring t, /*@only@*/ fileloc loc)
715{
716 exprNode e = exprNode_createLoc (ctype_string, loc);
717 int len = cstring_length (t) - 2;
718 char *ts = cstring_toCharsSafe (t);
719 char *s = cstring_toCharsSafe (cstring_create (len + 1));
720
721 if (context_getFlag (FLG_STRINGLITERALLEN))
722 {
723 if (len > context_getValue (FLG_STRINGLITERALLEN))
724 {
725 voptgenerror (FLG_STRINGLITERALLEN,
726 message
727 ("String literal length (%d) exceeds maximum "
728 "length (%d): %s",
729 len,
730 context_getValue (FLG_STRINGLITERALLEN),
731 t),
732 e->loc);
733 }
734 }
735
736 strncpy (s, ts+1, size_fromInt (len));
737 *(s + len) = '\0';
738
739
740 e->kind = XPR_STRINGLITERAL;
741 e->val = multiVal_makeString (cstring_fromCharsO (s));
742 e->edata = exprData_makeLiteral (t);
743 e->sref = sRef_makeType (ctype_string);
1ac6313d 744 /* Start modifications */
745 /* This expr is null terminated, so we set the len and size */
746 sRef_setNullTerminatedState(e->sref);
747 /*
748 TPRINTF("Len is set to : %d\n\n", strlen((char *)multiVal_forceString(e->val)));
749 TPRINTF("Size is set to : %d\n\n", strlen((char *)multiVal_forceString(e->val)));
750 TPRINTF("State is set to: %d\n\n", e->sref->bufinfo.bufstate);
751 */
752 sRef_setLen(e->sref, strlen((char *)multiVal_forceString(e->val)));
753 sRef_setSize(e->sref, strlen((char *)multiVal_forceString(e->val)));
885824d3 754
a0a162cd 755 if (context_getFlag (FLG_READONLYSTRINGS))
885824d3 756 {
757 sRef_setAliasKind (e->sref, AK_STATIC, fileloc_undefined);
758 sRef_setExKind (e->sref, XO_OBSERVER, loc);
759 }
760 else
761 {
762 sRef_setAliasKind (e->sref, AK_ERROR, fileloc_undefined);
763 }
764
765 return (e); /* s released */
766}
767
768exprNode exprNode_fromUIO (cstring c)
769{
770 fileloc loc = context_getSaveLocation ();
771 exprNode e = exprNode_createPlain (ctype_unknown);
772
773 e->kind = XPR_VAR;
774
775 if (fileloc_isUndefined (loc))
776 {
777 loc = fileloc_copy (g_currentloc);
778 }
779
780 e->loc = loc; /* save loc was mangled */
781 e->sref = defref;
782
783 if (usymtab_exists (c))
784 {
785 uentry ue = usymtab_lookupEither (c);
786
787 if (uentry_isDatatype (ue)
788 && uentry_isSpecified (ue))
789 {
790 llfatalerror
791 (message ("%q: Specified datatype %s used in code, but not defined. "
792 "(Cannot continue reasonably from this error.)",
793 fileloc_unparse (e->loc), c));
794 }
795 else
796 {
797 BADBRANCH;
798 }
799 }
800
801 llassertprint (!usymtab_exists (c), ("Entry exists: %s", c));
802
803 /*
804 ** was supercedeGlobalEntry...is this better?
805 */
806
807 if (!context_inIterEnd ())
808 {
809 if (context_inMacro ())
810 {
811 if (context_getFlag (FLG_UNRECOG))
812 {
813 voptgenerror
814 (FLG_MACROUNDEF,
815 message ("Unrecognized identifier in macro definition: %s", c), e->loc);
816 }
817 else
818 {
819 flagcode_recordSuppressed (FLG_UNRECOG);
820 }
821 }
822 else
823 {
824 voptgenerror
825 (FLG_UNRECOG, message ("Unrecognized identifier: %s", c),
826 e->loc);
827 }
828 }
829
830 e->edata = exprData_makeId (uentry_makeUnrecognized (c, fileloc_copy (loc)));
831
832 /* No alias errors for unrecognized identifiers */
833 sRef_setAliasKind (e->sref, AK_ERROR, loc);
834
835 return (e);
836}
837
838exprNode exprNode_createId (/*@observer@*/ uentry c)
839{
840 if (uentry_isValid (c))
841 {
842 exprNode e = exprNode_new ();
843
844 e->typ = uentry_getType (c);
845
846 if (uentry_isFunction (c)
847 && !sRef_isLocalVar (uentry_getSref (c)))
848 {
849 e->sref = sRef_undefined;
850 }
851 else
852 {
853 e->sref = uentry_getSref (c);
854 }
855
856 if (sRef_isStateUnknown (e->sref) && uentry_isNonLocal (c))
857 {
858 sRef_setDefined (e->sref, fileloc_undefined);
859 }
860
861 /*
862 ** yoikes! leaving this out was a heinous bug...that would have been
863 ** caught if i had lclint working first. gag!
864 */
865
866 e->etext = cstring_undefined;
867
868 if (uentry_isEitherConstant (c))
869 {
870 e->kind = XPR_CONST;
871 e->val = multiVal_copy (uentry_getConstantValue (c));
872 }
873 else
874 {
875 e->kind = XPR_VAR;
876 e->val = multiVal_unknown ();
877 }
878
879 e->edata = exprData_makeId (c);
880 e->loc = context_getSaveLocation ();
881
882 if (fileloc_isUndefined (e->loc))
883 {
884 fileloc_free (e->loc);
885 e->loc = fileloc_copy (g_currentloc);
886 }
887
888 e->guards = guardSet_new ();
889 e->sets = sRefSet_new ();
890 e->msets = sRefSet_new ();
891 e->uses = sRefSet_new ();
892
893 /*> missing fields, detected by lclint <*/
894 e->exitCode = XK_NEVERESCAPE;
895 e->isJumpPoint = FALSE;
896 e->canBreak = FALSE;
897 e->mustBreak = FALSE;
898
899 return e;
900 }
901 else
902 {
903 return exprNode_createUnknown ();
904 }
905}
906
907/*@notnull@*/ exprNode
908exprNode_fromIdentifier (/*@observer@*/ uentry c)
909{
910 exprNode ret;
911
912 if (context_justPopped ()) /* watch out! c could be dead */
913 {
914 uentry ce = usymtab_lookupSafe (LastIdentifier ());
915
916 if (uentry_isValid (ce))
917 {
918 c = ce;
919 }
920 else
921 {
922 llbuglit ("Looks like Aunt Millie forgot to walk to dog again.");
923 }
924 }
925
926 ret = exprNode_fromIdentifierAux (c);
927
928 return ret;
929}
930
931
932static /*@only@*/ /*@notnull@*/ exprNode
933exprNode_fromIdentifierAux (/*@observer@*/ uentry c)
934{
935 exprNode e = exprNode_createId (c);
936 sRef sr = e->sref;
937
938 uentry_setUsed (c, e->loc);
939
940 if (uentry_isVar (c) && sRef_isGlobal (sr))
941 {
942 checkGlobUse (c, FALSE, e);
943 }
944
945 return (e);
946}
947
948static bool
949exprNode_isZero (exprNode e)
950{
951 if (exprNode_isDefined (e))
952 {
953 multiVal m = exprNode_getValue (e);
954
955 if (multiVal_isInt (m))
956 {
957 return (multiVal_forceInt (m) == 0);
958 }
959 }
960
961 return FALSE;
962}
963
964static bool
965exprNode_isNonNegative (exprNode e)
966{
967 if (exprNode_isDefined (e))
968 {
969 multiVal m = exprNode_getValue (e);
970
971 if (multiVal_isInt (m))
972 {
973 return (multiVal_forceInt (m) >= 0);
974 }
975 }
976
977 return FALSE;
978}
979
980/*
981** a[x] - uses a but NOT a[]
982** result sref = a[] (set/use in assignment)
983**
984** The syntax x[a] is also legal in C, and has the same
985** semantics. If ind is an array, and arr is an int, flip
986** the arguments.
987*/
988
989/*@only@*/ exprNode
990exprNode_arrayFetch (/*@only@*/ exprNode e1, /*@only@*/ exprNode e2)
991{
992 /*
993 ** error in arr, error propagates (no new messages)
994 ** error in ind, assume valid and continue
995 */
996
997 if (exprNode_isError (e1))
998 {
999 exprNode_free (e2);
1000 return (exprNode_makeError ());
1001 }
1002 else
1003 {
1004 exprNode arr;
1005 exprNode ind;
1006 ctype carr = exprNode_getType (e1);
1007 ctype crarr = ctype_realType (carr);
1008
1009 /*
1010 ** this sets up funny aliasing, that leads to spurious
1011 ** lclint errors. Hence, the i2 comments.
1012 */
1013
1014 if (!ctype_isRealArray (crarr)
1015 && ctype_isRealNumeric (crarr)
1016 && !exprNode_isError (e2)
1017 && ctype_isRealAP (exprNode_getType (e2))) /* fetch like 3[a] */
1018 {
1019 arr = e2;
1020 ind = e1;
1021
1022 carr = exprNode_getType (arr);
1023 crarr = ctype_realType (carr);
1024 }
1025 else
1026 {
1027 arr = e1;
1028 ind = e2;
1029 }
1030
1031 if (sRef_possiblyNull (arr->sref))
1032 {
1033 if (!usymtab_isGuarded (arr->sref))
1034 {
1035 if (optgenerror (FLG_NULLDEREF,
1036 message ("Index of %s pointer %q: %s",
1037 sRef_nullMessage (arr->sref),
1038 sRef_unparse (arr->sref),
1039 exprNode_unparse (arr)),
1040 arr->loc))
1041 {
1042 sRef_showNullInfo (arr->sref);
1043
1044 /* suppress future messages */
1045 sRef_setNullError (arr->sref);
1046 }
1047 }
1048 }
1049
1050 if (exprNode_isError (ind))
1051 {
1052 if ((ctype_isArrayPtr (crarr)
1053 && !ctype_isFunction (crarr))
1054 || ctype_isUnknown (carr))
1055 {
1056 exprNode ret = exprNode_createPartialCopy (arr);
1057
1058 if (ctype_isKnown (carr))
1059 {
1060 ret->typ = ctype_baseArrayPtr (crarr);
1061 }
1062 else
1063 {
1064 ret->typ = ctype_unknown;
1065 }
1066
1067 ret->sref = sRef_makeArrayFetch (arr->sref);
1068
1069 ret->kind = XPR_FETCH;
1070
1071 /*
1072 ** Because of funny aliasing (when arr and ind are
1073 ** flipped) spurious errors would be reported here.
1074 */
1075
1076 /*@i2@*/ ret->edata = exprData_makePair (arr, ind);
1077 checkSafeUse (ret, arr->sref);
1078 return (ret);
1079 }
1080 else
1081 {
1082 voptgenerror (FLG_TYPE,
1083 message ("Array fetch from non-array (%t): %s[%s]", carr,
1084 exprNode_unparse (e1), exprNode_unparse (e2)),
1085 arr->loc);
1086 exprNode_free (arr);
1087 return (exprNode_makeError ());
1088 }
1089 }
1090 else
1091 {
1092 if (!ctype_isForceRealInt (&(ind->typ)))
1093 {
1094 ctype rt = ctype_realType (ind->typ);
1095
1096 if (ctype_isChar (rt))
1097 {
1098 vnoptgenerror
1099 (FLG_CHARINDEX,
1100 message ("Array fetch using non-integer, %t: %s[%s]",
1101 ind->typ,
1102 exprNode_unparse (e1), exprNode_unparse (e2)),
1103 arr->loc);
1104 }
1105 else if (ctype_isEnum (rt))
1106 {
1107 vnoptgenerror
1108 (FLG_ENUMINDEX,
1109 message ("Array fetch using non-integer, %t: %s[%s]",
1110 ind->typ,
1111 exprNode_unparse (e1), exprNode_unparse (e2)),
1112 arr->loc);
1113 }
1114 else
1115 {
1116 voptgenerror
1117 (FLG_TYPE,
1118 message ("Array fetch using non-integer, %t: %s[%s]",
1119 ind->typ,
1120 exprNode_unparse (e1), exprNode_unparse (e2)),
1121 arr->loc);
1122 }
1123
1124 multiVal_free (ind->val);
1125 ind->val = multiVal_unknown ();
1126 }
1127
1128 if (ctype_isArrayPtr (crarr) && !ctype_isFunction (crarr))
1129 {
1130 exprNode ret = exprNode_createSemiCopy (arr);
1131 multiVal m = exprNode_getValue (ind);
1132
1133 ret->typ = ctype_baseArrayPtr (crarr);
1134 ret->kind = XPR_FETCH;
1135
1136 if (multiVal_isInt (m))
1137 {
1138 int i = (int) multiVal_forceInt (m);
1139
1140 if (sRef_isValid (arr->sref)) {
1141 ret->sref = sRef_makeArrayFetchKnown (arr->sref, i);
1142 } else {
1143 ret->sref = sRef_undefined;
1144 }
1145 }
1146 else
1147 {
1148 ret->sref = sRef_makeArrayFetch (arr->sref);
1149 }
1150
1151 ret->sets = sRefSet_realNewUnion (arr->sets, ind->sets);
1152 ret->msets = sRefSet_realNewUnion (arr->msets, ind->msets);
1153 ret->uses = sRefSet_realNewUnion (arr->uses, ind->uses);
1154
1155 /* (see comment on spurious errors above) */
1156 /*@i2@*/ ret->edata = exprData_makePair (arr, ind);
1157
1158 exprNode_checkUse (ret, ind->sref, ind->loc);
1159 exprNode_checkUse (ret, arr->sref, arr->loc);
1160
1161 return (ret);
1162 }
1163 else
1164 {
1165 if (ctype_isUnknown (carr))
1166 {
1167 exprNode ret = exprNode_createPartialCopy (arr);
1168
1169 ret->kind = XPR_FETCH;
1170 ret->typ = ctype_unknown;
1171 ret->sets = sRefSet_union (ret->sets, ind->sets);
1172 ret->msets = sRefSet_union (ret->msets, ind->msets);
1173 ret->uses = sRefSet_union (ret->uses, ind->uses);
1174
1175 /* (see comment on spurious errors above) */
1176 /*@i2@*/ ret->edata = exprData_makePair (arr, ind);
1177
1178 exprNode_checkUse (ret, ind->sref, ind->loc);
1179 exprNode_checkUse (ret, arr->sref, arr->loc);
1180 return (ret);
1181 }
1182 else
1183 {
1184 voptgenerror
1185 (FLG_TYPE,
1186 message ("Array fetch from non-array (%t): %s[%s]", carr,
1187 exprNode_unparse (e1), exprNode_unparse (e2)),
1188 arr->loc);
1189
1190 exprNode_free (arr);
1191 exprNode_free (ind);
1192
1193 return (exprNode_makeError ());
1194 }
1195 }
1196 }
1197 }
1198 BADEXIT;
1199}
1200
1201
1202static int
1203checkArgs (uentry fcn, /*@dependent@*/ exprNode f, ctype t,
1204 exprNodeList args, exprNode ret)
1205{
1206 return (checkArgsReal (fcn, f, ctype_argsFunction (t), args, FALSE, ret));
1207}
1208
1209/*
1210** checkPrintfArgs --- checks arguments for printf-like functions
1211** Arguments before ... have already been checked.
1212** The argument before the ... is a char *.
1213** argno is the format string argument.
1214*/
1215
1216static void
1217checkPrintfArgs (/*@notnull@*/ /*@dependent@*/ exprNode f, uentry fcn,
1218 exprNodeList args, exprNode ret, int argno)
1219{
1220 /*
1221 ** the last argument before the elips is the format string
1222 */
1223
1224 int i = argno;
1225 fileloc formatloc;
1226 int nargs = exprNodeList_size (args);
1227 uentryList params = uentry_getParams (fcn);
1228 exprNode a;
1229
1230 /*
1231 ** These should be ensured by checkSpecialFunction
1232 */
1233
1234 llassert (uentryList_size (params) == argno + 1);
1235 llassert (uentry_isElipsisMarker (uentryList_getN (params, argno)));
1236
1237 a = exprNodeList_getN (args, argno - 1);
1238 formatloc = fileloc_copy (exprNode_loc (a));
1239
1240 if (exprNode_isDefined (a) && exprNode_isStringLiteral (a)
1241 && exprNode_knownStringValue (a))
1242 {
1243 char *format = cstring_toCharsSafe (multiVal_forceString (exprNode_getValue (a)));
1244 char *code = format;
1245 char *ocode = code;
1246
1247 nargs = exprNodeList_size (args);
1248
1249 while ((code = strchr (code, '%')) != NULL)
1250 {
1251 char *origcode = code;
1252 char key = *(++code);
1253 ctype modtype = ctype_int;
1254 bool modified = FALSE;
1255
1256 fileloc_addColumn (formatloc, code - ocode);
1257
1258 /* ignore flags */
1259 while (isFlagKey (key))
1260 {
1261 key = *(++code);
1262 fileloc_incColumn (formatloc);
1263 }
1264
1265 if (key == 'm') /* skipped in syslog */
1266 {
1267 continue;
1268 }
1269
1270 /* ignore field width */
1271 while (isdigit ((int) key) != 0)
1272 {
1273 key = *(++code);
1274 fileloc_incColumn (formatloc);
1275 }
1276
1277 /* ignore precision */
1278 if (key == '.')
1279 {
1280 key = *(++code);
1281 fileloc_incColumn (formatloc);
1282
1283 /*
1284 ** In printf, '*' means: read the next arg as an int for the
1285 ** field width. This seems to be missing from my copy of the
1286 ** standard x3.159-1989. Setion 4.9.6.1 refers to * (described
1287 ** later) but never does.
1288 */
1289
1290 if (key == '*')
1291 {
1292 ; /* don't do anything --- handle later */
1293 }
1294 else
1295 {
1296 while (isdigit ((int) key) != 0)
1297 {
1298 key = *(++code);
1299 fileloc_incColumn (formatloc);
1300 }
1301 }
1302 }
1303
1304 if (key == 'h')
1305 {
1306 modtype = ctype_sint; /* short */
1307 key = *(++code);
1308 fileloc_incColumn (formatloc);
1309 }
1310 else if (key == 'l' || key == 'L')
1311 {
1312 modtype = ctype_lint; /* long */
1313 key = *(++code);
1314 fileloc_incColumn (formatloc);
a0a162cd 1315
1316 if (key == 'l' || key == 'L') {
1317 modtype = ctype_llint; /* long long */
1318 key = *(++code);
1319 fileloc_incColumn (formatloc);
1320 }
885824d3 1321 }
1322 else
1323 {
1324 ; /* no modifier */
1325 }
1326
1327 /* now, key = type of conversion to apply */
1328 ++code;
1329 fileloc_incColumn (formatloc);
1330
1331 if (key != '%')
1332 {
1333 if (i >= nargs)
1334 {
1335 if (optgenerror
1336 (FLG_TYPE,
1337 message ("No argument corresponding to %q format "
1338 "code %d (%%%h): \"%s\"",
1339 uentry_getName (fcn),
1340 i, key,
1341 cstring_fromChars (format)),
1342 f->loc))
1343 {
1344 if (fileloc_isDefined (formatloc)
1345 && context_getFlag (FLG_SHOWCOL))
1346 {
1347 llgenindentmsg (cstring_makeLiteral ("Corresponding format code"),
1348 formatloc);
1349 }
1350 }
1351 i++;
1352 }
1353 else
1354 {
1355 a = exprNodeList_getN (args, i);
1356 i++;
1357
1358 if (!exprNode_isError (a))
1359 {
1360 ctype expecttype;
1361
1362 switch (key)
1363 {
1364 case '*': /* int argument for fieldwidth */
1365 expecttype = ctype_int;
1366 *(--code) = '%'; /* convert it for next code */
1367 fileloc_subColumn (formatloc, 1);
1368 /*@switchbreak@*/ break;
1369 case 'u':
1370 case 'o':
1371 expecttype = ctype_combine (ctype_uint, modtype);
1372 /*@switchbreak@*/ break;
1373
1374 case 'i': /* int argument */
1375 case 'd':
1376 expecttype = ctype_combine (ctype_int, modtype);
1377 /*@switchbreak@*/ break;
1378
1379 case 'x': /* unsigned int */
1380 case 'X':
1381 expecttype = ctype_combine (ctype_uint, modtype);
1382 /*@switchbreak@*/ break;
1383
1384 case 'e':
1385 case 'E':
1386 case 'g':
1387 case 'G':
1388 case 'f': /* double */
1389 expecttype = ctype_combine (ctype_double, modtype);
1390 /*@switchbreak@*/ break;
1391
1392 case 'c': /* int converted to char (check its a char?) */
1393 expecttype = ctype_makeConj (ctype_char, ctype_uchar);
1394 /*@switchbreak@*/ break;
1395
1396 case 's': /* string */
1397 expecttype = ctype_string;
1398 /*@switchbreak@*/ break;
1399 case '[':
1400 /* skip to ']' */
1401 while (((key = *(++code)) != ']')
1402 && (key != '\0'))
1403 {
1404 fileloc_incColumn (formatloc);
1405 }
1406
1407 if (key == '\0')
1408 {
1409 llfatalerrorLoc
1410 (message ("Bad character set format: %s",
1411 cstring_fromChars (origcode)));
1412 }
1413
1414 expecttype = ctype_string;
1415 /*@switchbreak@*/ break;
1416
1417 case 'p': /* pointer */
1418 expecttype = ctype_makePointer (ctype_void);
1419 /* really! */
1420 /*@switchbreak@*/ break;
1421
1422 case 'n': /* pointer to int, modified by call! */
1423 expecttype = ctype_combine (ctype_makePointer (ctype_int), modtype);
1424 modified = TRUE;
1425 uentry_setDefState (regArg, SS_ALLOCATED); /* corresponds to out */
1426 /*@switchbreak@*/ break;
1427
1428 case 'm': /* in a syslog, it doesn't consume an argument */
1429 /* should check we're really doing syslog */
1430
1431 /*@switchbreak@*/ break;
1432
1433
1434 default:
1435 expecttype = ctype_unknown;
1436
1437 voptgenerror
1438 (FLG_FORMATCODE,
1439 message ("Unrecognized format code: %s",
1440 cstring_fromChars (origcode)),
1441 fileloc_isDefined (formatloc)
1442 ? formatloc : g_currentloc);
1443
1444 /*@switchbreak@*/ break;
1445 }
1446
1447 if (!(exprNode_matchArgType (expecttype, a)))
1448 {
1449 if (ctype_isVoidPointer (expecttype)
1450 && ctype_isRealAbstract (a->typ)
1451 && (context_getFlag (FLG_ABSTVOIDP)))
1452 {
1453 ;
1454 }
1455 else
1456 {
1457 if (llgenformattypeerror
1458 (expecttype, exprNode_undefined,
1459 a->typ, a,
1460 message ("Format argument %d to %q (%%%h) expects "
1461 "%t gets %t: %s",
1462 i - argno,
1463 uentry_getName (fcn),
1464 key, expecttype,
1465 a->typ, exprNode_unparse (a)),
1466 a->loc))
1467 {
1468 if (fileloc_isDefined (formatloc)
1469 && context_getFlag (FLG_SHOWCOL))
1470 {
1471 llgenindentmsg
1472 (cstring_makeLiteral
1473 ("Corresponding format code"),
1474 formatloc);
1475 }
1476 }
1477 }
1478 }
1479
1480 uentry_setType (regArg, expecttype);
1481 checkOneArg (regArg, a, f, FALSE, i+1, nargs);
1482
1483 if (ctype_equal (expecttype, ctype_string))
1484 {
1485 exprNode_checkUse (a, sRef_makePointer (a->sref), a->loc);
1486 }
1487
1488 uentry_setType (regArg, ctype_unknown);
1489 uentry_fixupSref (regArg);
1490
1491 if (modified)
1492 {
1493 exprNode_checkCallModifyVal (a->sref, args, f, ret);
1494 }
1495 }
1496 else
1497 {
1498 ;
1499 }
1500 }
1501 }
1502 ocode = code;
1503 }
1504
1505 if (i < nargs)
1506 {
1507 voptgenerror (FLG_TYPE,
1508 message ("Format string for %q has %d arg%p, given %d",
1509 uentry_getName (fcn), i - argno, nargs - argno),
1510 f->loc);
1511 }
1512 }
1513 else
1514 {
1515 /* no checking possible for compile-time unknown format strings */
1516 }
1517
1518 fileloc_free (formatloc);
1519}
1520
1521static void
1522checkScanfArgs (/*@notnull@*/ /*@dependent@*/ exprNode f, uentry fcn,
1523 exprNodeList args, exprNode ret, int argno)
1524{
1525 int i = argno;
1526 fileloc formatloc;
1527 int nargs = exprNodeList_size (args);
1528 uentryList params = uentry_getParams (fcn);
1529 exprNode a;
1530
1531 /*
1532 ** These should be ensured by checkSpecialFunction
1533 */
1534
1535 llassert (uentryList_size (params) == argno + 1);
1536 llassert (uentry_isElipsisMarker (uentryList_getN (params, argno)));
1537
1538 a = exprNodeList_getN (args, argno - 1);
1539 formatloc = fileloc_copy (exprNode_loc (a));
1540
1541 if (exprNode_isDefined (a) && exprNode_isStringLiteral (a)
1542 && exprNode_knownStringValue (a))
1543 {
1544 char *format = cstring_toCharsSafe (multiVal_forceString (exprNode_getValue (a)));
1545 char *code = format;
1546 char *ocode = code;
1547
1548 nargs = exprNodeList_size (args);
1549
1550 while ((code = strchr (code, '%')) != NULL)
1551 {
1552 char *origcode = code;
1553 char key = *(++code);
1554 ctype modtype = ctype_int;
1555 char modifier = '\0';
1556 bool modified = TRUE;
1557 bool ignore = FALSE;
1558
1559 fileloc_addColumn (formatloc, code - ocode);
1560
1561 /*
1562 ** this is based on ANSI standard library description of fscanf
1563 ** (from ANSI standard X3.159-1989, 4.9.6.1)
1564 */
1565
1566 /* '*' suppresses assignment (does not need match argument) */
1567
1568 if (key == '*')
1569 {
1570 key = *(++code);
1571 modified = FALSE;
1572 ignore = TRUE;
1573 fileloc_incColumn (formatloc);
1574 }
1575
1576 /* ignore field width */
1577 while (isdigit ((int) key) != 0)
1578 {
1579 key = *(++code);
1580 fileloc_incColumn (formatloc);
1581 }
1582
1583 if (key == 'h')
1584 {
1585 modtype = ctype_sint; /* short */
1586 key = *(++code);
1587 fileloc_incColumn (formatloc);
1588 }
1589 else if (key == 'l' || key == 'L')
1590 {
1591 modtype = ctype_lint; /* long */
1592 modifier = key;
1593
1594 key = *(++code);
1595 fileloc_incColumn (formatloc);
a0a162cd 1596
1597 if (key == 'l' || key == 'L') {
1598 modtype = ctype_llint; /* long long */
1599 key = *(++code);
1600 fileloc_incColumn (formatloc);
1601 }
885824d3 1602 }
1603 else
1604 {
1605 ; /* no modifier */
1606 }
1607
1608 /* now, key = type of conversion to apply */
1609 ++code;
1610 fileloc_incColumn (formatloc);
1611
1612 if (key != '%')
1613 {
1614 if (ignore)
1615 {
1616 ;
1617 }
1618 else
1619 {
1620 if (i >= nargs)
1621 {
1622 if (optgenerror
1623 (FLG_TYPE,
1624 message ("No argument corresponding to %q format "
1625 "code %d (%%%h): \"%s\"",
1626 uentry_getName (fcn),
1627 i, key,
1628 cstring_fromChars (format)),
1629 f->loc))
1630 {
1631 if (fileloc_isDefined (formatloc)
1632 && context_getFlag (FLG_SHOWCOL))
1633 {
1634 llgenindentmsg
1635 (cstring_makeLiteral ("Corresponding format code"),
1636 formatloc);
1637 }
1638 }
1639 i++;
1640 }
1641 else
1642 {
1643 a = exprNodeList_getN (args, i);
1644 i++;
1645
1646 if (!exprNode_isError (a))
1647 {
1648 ctype expecttype;
1649
1650 switch (key)
1651 {
1652 case '*': /* int argument for fieldwidth */
1653 expecttype = ctype_makePointer (ctype_int);
1654 *(--code) = '%'; /* convert it for next code */
1655 fileloc_subColumn (formatloc, 1);
1656 /*@switchbreak@*/ break;
1657 case 'u':
1658 case 'o':
1659 expecttype = ctype_makePointer (ctype_combine (ctype_uint, modtype));
1660 /*@switchbreak@*/ break;
1661
1662 case 'i':
1663 case 'd':
1664 case 'x':
1665 case 'X': /* unsigned int */
1666 expecttype = ctype_makePointer (ctype_combine (ctype_int, modtype));
1667 /*@switchbreak@*/ break;
1668
1669 case 'e':
1670 case 'E':
1671 case 'g':
1672 case 'G':
1673 case 'f':
1674 /* printf is double, scanf is float! */
1675
a0a162cd 1676 if (modifier == 'l')
885824d3 1677 {
1678 expecttype = ctype_makePointer (ctype_double);
1679 }
1680 else if (modifier == 'L')
1681 {
1682 expecttype = ctype_makePointer (ctype_ldouble);
1683 }
1684 else
1685 {
1686 llassert (modifier == '\0');
1687 expecttype = ctype_makePointer (ctype_float);
1688 }
1689 /*@switchbreak@*/ break;
1690
1691 case 'c': /* int converted to char (check its a char?) */
1692 expecttype = ctype_makePointer (ctype_makeConj (ctype_char, ctype_uchar));
1693 /*@switchbreak@*/ break;
1694
1695 case 's': /* string */
1696 expecttype = ctype_string;
1697 /*@switchbreak@*/ break;
1698
1699 case '[':
1700 /* skip to ']' */
1701 while (((key = *(++code)) != ']')
1702 && (key != '\0'))
1703 {
1704 fileloc_incColumn (formatloc);
1705 }
1706
1707 if (key == '\0')
1708 {
1709 llfatalerrorLoc
1710 (message ("Bad character set format: %s",
1711 cstring_fromChars (origcode)));
1712 }
1713
1714 expecttype = ctype_string;
1715 /*@switchbreak@*/ break;
1716
1717 case 'p': /* pointer */
1718 expecttype = ctype_unknown;
1719 /* really! */
1720 /*@switchbreak@*/ break;
1721
1722 case 'n': /* pointer to int, modified by call! */
1723 expecttype = ctype_makePointer (ctype_int);
1724 /*@switchbreak@*/ break;
1725
1726 default:
1727 expecttype = ctype_unknown;
1728
1729 voptgenerror
1730 (FLG_FORMATCODE,
1731 message ("Unrecognized format code: %s",
1732 cstring_fromChars (origcode)),
1733 fileloc_isDefined (formatloc)
1734 ? formatloc : g_currentloc);
1735
1736 /*@switchbreak@*/ break;
1737 }
1738
1739 if (!(exprNode_matchArgType (expecttype, a)))
1740 {
1741 if (ctype_isVoidPointer (expecttype)
1742 && ctype_isRealAbstract (a->typ)
1743 && (context_getFlag (FLG_ABSTVOIDP)))
1744 {
1745 ;
1746 }
1747 else
1748 {
1749 if (modifier != '\0')
1750 {
1751 if (llgenformattypeerror
1752 (expecttype, exprNode_undefined,
1753 a->typ, a,
1754 message ("Format argument %d to %q (%%%h%h) expects "
1755 "%t gets %t: %s",
1756 i - argno,
1757 uentry_getName (fcn),
1758 modifier,
1759 key, expecttype,
1760 a->typ, exprNode_unparse (a)),
1761 a->loc))
1762 {
1763 if (fileloc_isDefined (formatloc)
1764 && context_getFlag (FLG_SHOWCOL))
1765 {
1766 llgenindentmsg
1767 (cstring_makeLiteral
1768 ("Corresponding format code"),
1769 formatloc);
1770 }
1771 }
1772
1773 }
1774 else
1775 {
1776 if (llgenformattypeerror
1777 (expecttype, exprNode_undefined,
1778 a->typ, a,
1779 message ("Format argument %d to %q (%%%h) expects "
1780 "%t gets %t: %s",
1781 i - argno,
1782 uentry_getName (fcn),
1783 key, expecttype,
1784 a->typ, exprNode_unparse (a)),
1785 a->loc))
1786 {
1787 if (fileloc_isDefined (formatloc)
1788 && context_getFlag (FLG_SHOWCOL))
1789 {
1790 llgenindentmsg
1791 (cstring_makeLiteral
1792 ("Corresponding format code"),
1793 formatloc);
1794 }
1795 }
1796 }
1797 }
1798 }
1799
1800 uentry_setType (outArg, expecttype);
1801 checkOneArg (outArg, a, f, FALSE, i+1, nargs);
1802 uentry_setType (outArg, ctype_unknown);
1803 uentry_fixupSref (outArg);
1804
1805 if (modified)
1806 {
1807 exprNode_checkCallModifyVal (a->sref, args, f, ret);
1808 }
1809 }
1810 else
1811 {
1812 /* a->sref = defref; */
1813 }
1814 }
1815 }
1816 }
1817 ocode = code;
1818 }
1819
1820 if (i < nargs)
1821 {
1822 voptgenerror (FLG_TYPE,
1823 message ("Format string for %q has %d arg%p, given %d",
1824 uentry_getName (fcn), i - argno, nargs - argno),
1825 f->loc);
1826 }
1827 }
1828 else
1829 {
1830 /* no checking possible for compile-time unknown format strings */
1831 }
1832
1833 fileloc_free (formatloc);
1834}
1835
1836static void
1837checkMessageArgs (/*@notnull@*/ /*@dependent@*/ exprNode f,
1838 uentry fcn,
1839 exprNodeList args,
1840 /*@unused@*/ int argno)
1841{
1842 /*
1843 ** the last argument before the elips is the format string
1844 */
1845
1846 int nargs = exprNodeList_size (args);
1847 int i = argno;
1848 fileloc formatloc;
1849 exprNode a;
1850
1851 a = exprNodeList_getN (args, argno - 1);
1852 formatloc = fileloc_copy (exprNode_loc (a));
1853
1854 if (ctype_isUnknown (cstringType)) {
1855 if (usymtab_existsType (cstring_makeLiteralTemp ("cstring")))
1856 {
1857 cstringType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("cstring"));
1858 }
1859 }
1860
1861 if (ctype_isUnknown (ctypeType)) {
1862 if (usymtab_existsType (cstring_makeLiteralTemp ("ctype")))
1863 {
1864 ctypeType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("ctype"));
1865 }
1866 }
1867
1868 if (ctype_isUnknown (filelocType)) {
1869 if (usymtab_existsType (cstring_makeLiteralTemp ("fileloc")))
1870 {
1871 filelocType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("fileloc"));
1872 }
1873 }
1874
1875 if (exprNode_isDefined (a) && exprNode_isStringLiteral (a)
1876 && exprNode_knownStringValue (a))
1877 {
1878 cstring format = multiVal_forceString (exprNode_getValue (a));
1879 char *code = cstring_toCharsSafe (format);
1880 char *ocode = code;
1881
1882 nargs = exprNodeList_size (args);
1883
1884 while ((code = strchr (code, '%')) != NULL)
1885 {
1886 char *origcode = code;
1887 char key = *(++code);
1888 bool isOnly = FALSE;
1889
1890 fileloc_addColumn (formatloc, code - ocode);
1891
1892 while (key >= '0' && key <= '9')
1893 {
1894 key = *(++code);
1895 fileloc_incColumn (formatloc);
1896 }
1897
1898 ++code;
1899 fileloc_incColumn (formatloc);
1900
1901 if (key != '%')
1902 {
1903 if (key == 'p')
1904 {
1905 goto nextKey;
1906 }
1907
1908 if (i >= nargs)
1909 {
1910 voptgenerror
1911 (FLG_TYPE,
1912 message ("Message missing format arg %d (%%%h): \"%s\"",
1913 i + 1, key, format),
1914 f->loc);
1915 i++;
1916 }
1917 else
1918 {
1919 a = exprNodeList_getN (args, i);
1920 i++;
1921
1922 nextKey:
1923 if (!exprNode_isError (a))
1924 {
1925 ctype expecttype;
1926
1927 /*@-loopswitchbreak@*/
1928
1929 switch (key)
1930 {
1931 case 'c':
1932 case 'h':
1933 expecttype = ctype_char; break;
1934 case 's':
1935 expecttype = cstringType; break;
1936 case 'q':
1937 expecttype = cstringType; isOnly = TRUE; break;
1938 case 'x':
1939 expecttype = cstringType; isOnly = TRUE; break;
1940 case 'd': expecttype = ctype_int; break;
1941 case 'u': expecttype = ctype_uint; break;
1942 case 'w': expecttype = ctype_ulint; break;
1943 case 'f': expecttype = ctype_float; break;
1944 case 'b': expecttype = ctype_bool; break;
1945 case 't': expecttype = ctypeType; break;
1946 case 'l': expecttype = filelocType; break;
1947 case 'p': /* a wee bit of a hack methinks */
1948 expecttype = ctype_int;
1949 break;
1950 case 'r': expecttype = ctype_bool; break;
1951 default:
1952 expecttype = ctype_unknown;
1953 voptgenerror
1954 (FLG_FORMATCODE,
1955 message ("Unrecognized format code: %s",
1956 cstring_fromChars (origcode)),
1957 fileloc_isDefined (formatloc)
1958 ? formatloc : g_currentloc);
1959 break;
1960 }
1961 /*@=loopswitchbreak@*/
1962
1963 if (!(exprNode_matchArgType (expecttype, a)))
1964 {
1965 if (ctype_isVoidPointer (expecttype)
1966 && ctype_isRealAbstract (a->typ)
1967 && (context_getFlag (FLG_ABSTVOIDP)))
1968 {
1969 ;
1970 }
1971 else
1972 {
1973 if (llgenformattypeerror
1974 (expecttype, exprNode_undefined,
1975 a->typ, a,
1976 message ("Format argument %d to %q (%%%h) expects "
1977 "%t gets %t: %s",
1978 i - argno,
1979 uentry_getName (fcn),
1980 key, expecttype,
1981 a->typ, exprNode_unparse (a)),
1982 a->loc))
1983 {
1984 if (fileloc_isDefined (formatloc)
1985 && context_getFlag (FLG_SHOWCOL))
1986 {
1987 llgenindentmsg
1988 (cstring_makeLiteral
1989 ("Corresponding format code"),
1990 formatloc);
1991 }
1992 }
1993 }
1994 }
1995
1996 if (ctype_equal (expecttype, cstringType))
1997 {
1998 if (isOnly)
1999 {
2000 checkOneArg (csOnlyArg, a, f, FALSE, i+1, nargs);
2001 uentry_fixupSref (csOnlyArg);
2002 }
2003 else
2004 {
2005 checkOneArg (csArg, a, f, FALSE, i+1, nargs);
2006 uentry_fixupSref (csArg);
2007 }
2008 }
2009 else
2010 {
2011 checkOneArg (regArg, a, f, FALSE, i+1, nargs);
2012 uentry_fixupSref (regArg);
2013 }
2014 }
2015 }
2016 }
2017 }
2018
2019 if (i < nargs)
2020 {
2021 voptgenerror (FLG_TYPE,
2022 message ("Format string for %q has %d arg%p, given %d",
2023 uentry_getName (fcn), i - argno, nargs -argno),
2024 f->loc);
2025 }
2026 }
2027 else
2028 {
2029 /* no checking possible for compile-time unknown format strings */
2030 }
2031
2032 fileloc_free (formatloc);
2033}
2034
2035static void
2036 checkExpressionDefinedAux (/*@notnull@*/ exprNode e1,
2037 /*@notnull@*/ exprNode e2,
2038 sRefSet sets1,
2039 sRefSet sets2,
2040 lltok op,
2041 flagcode flag)
2042{
2043 bool hadUncon = FALSE;
2044
2045 if (sRef_isGlobal (sRef_getRootBase (e1->sref)) &&
2046 sRefSet_hasUnconstrained (sets2))
2047 {
2048 voptgenerror
2049 (FLG_EVALORDERUNCON,
2050 message
2051 ("Expression may have undefined behavior (%q used in right operand "
2052 "may set global variable %q used in left operand): %s %s %s",
2053 sRefSet_unparseUnconstrained (sets2),
2054 sRef_unparse (sRef_getRootBase (e1->sref)),
2055 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2056 e2->loc);
2057 }
2058
2059 if (sRef_isGlobal (sRef_getRootBase (e2->sref)) &&
2060 sRefSet_hasUnconstrained (sets1))
2061 {
2062 voptgenerror
2063 (FLG_EVALORDERUNCON,
2064 message
2065 ("Expression has undefined behavior (%q used in left operand "
2066 "may set global variable %q used in right operand): %s %s %s",
2067 sRefSet_unparseUnconstrained (sets1),
2068 sRef_unparse (e2->sref),
2069 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2070 e2->loc);
2071 }
2072
2073 sRefSet_realElements (e1->uses, sr)
2074 {
2075 if (sRef_isMeaningful (sr) && sRefSet_member (sets2, sr))
2076 {
2077 voptgenerror
2078 (FLG_EVALORDER,
2079 message
2080 ("Expression has undefined behavior (left operand uses %q, "
2081 "modified by right operand): %s %s %s",
2082 sRef_unparse (sr),
2083 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2084 e2->loc);
2085 }
2086 } end_sRefSet_realElements;
2087
2088 sRefSet_realElements (sets1, sr)
2089 {
2090 if (sRef_isMeaningful (sr))
2091 {
2092 if (sRef_same (sr, e2->sref))
2093 {
2094 voptgenerror
2095 (flag,
2096 message
2097 ("Expression has undefined behavior (value of right operand "
2098 "modified by left operand): %s %s %s",
2099 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2100 e2->loc);
2101 }
2102 else if (sRefSet_member (e2->uses, sr))
2103 {
2104 voptgenerror
2105 (flag,
2106 message
2107 ("Expression has undefined behavior (left operand modifies %q, "
2108 "used by right operand): %s %s %s",
2109 sRef_unparse (sr),
2110 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2111 e2->loc);
2112 }
2113 else
2114 {
2115 if (sRefSet_member (sets2, sr))
2116 {
2117 if (sRef_isUnconstrained (sr))
2118 {
2119 if (hadUncon)
2120 {
2121 ;
2122 }
2123 else
2124 {
2125 hadUncon = optgenerror
2126 (FLG_EVALORDERUNCON,
2127 message
2128 ("Expression may have undefined behavior. Left operand "
2129 "calls %q; right operand calls %q. The unconstrained "
2130 "functions may modify global state used by "
2131 "the other operand): %s %s %s",
2132 sRefSet_unparseUnconstrained (sets1),
2133 sRefSet_unparseUnconstrained (sets2),
2134 exprNode_unparse (e1), lltok_unparse (op),
2135 exprNode_unparse (e2)),
2136 e2->loc);
2137 }
2138 }
2139 else
2140 {
2141 voptgenerror
2142 (flag,
2143 message
2144 ("Expression has undefined behavior (both "
2145 "operands modify %q): %s %s %s",
2146 sRef_unparse (sr),
2147 exprNode_unparse (e1),
2148 lltok_unparse (op), exprNode_unparse (e2)),
2149 e2->loc);
2150 }
2151 }
2152 }
2153 }
2154 } end_sRefSet_realElements;
2155}
2156
2157static void checkExpressionDefined (exprNode e1, exprNode e2, lltok op)
2158{
2159 bool hasError = FALSE;
2160
2161 if (exprNode_isError (e1) || exprNode_isError (e2))
2162 {
2163 return;
2164 }
2165
2166 if (sRefSet_member (e2->sets, e1->sref))
2167 {
2168 if (e2->kind == XPR_CALL)
2169 {
2170 ;
2171 }
2172 else
2173 {
2174 hasError = optgenerror
2175 (FLG_EVALORDER,
2176 message ("Expression has undefined behavior "
2177 "(value of left operand is modified "
2178 "by right operand): %s %s %s",
2179 exprNode_unparse (e1), lltok_unparse (op),
2180 exprNode_unparse (e2)),
2181 e2->loc);
2182 }
2183 }
2184
2185 if (context_getFlag (FLG_EVALORDERUNCON))
2186 {
2187 if (sRefSet_member (e2->msets, e1->sref))
2188 {
2189 if (e2->kind == XPR_CALL)
2190 {
2191 ;
2192 }
2193 else
2194 {
2195 hasError = optgenerror
2196 (FLG_EVALORDER,
2197 message
2198 ("Expression has undefined behavior (value of left "
2199 "operand may be modified by right operand): %s %s %s",
2200 exprNode_unparse (e1), lltok_unparse (op),
2201 exprNode_unparse (e2)),
2202 e2->loc);
2203 }
2204 }
2205 }
2206
2207 if (!hasError)
2208 {
2209 checkExpressionDefinedAux (e1, e2, e1->sets, e2->sets, op, FLG_EVALORDER);
2210
2211 if (context_maybeSet (FLG_EVALORDERUNCON))
2212 {
2213 checkExpressionDefinedAux (e1, e2, e1->msets,
2214 e2->msets, op, FLG_EVALORDERUNCON);
2215 }
2216 }
2217}
2218
2219static void checkSequencing (exprNode p_f, exprNodeList p_args);
2220
2221static int
2222 checkArgsReal (uentry fcn, /*@dependent@*/ exprNode f, uentryList cl,
2223 exprNodeList args, bool isIter, exprNode ret)
2224{
2225 int special = 0;
2226
2227 if (!exprNode_isError (f))
2228 {
2229 if (!uentryList_isMissingParams (cl))
2230 {
2231 int nargs = exprNodeList_size (args);
2232 int expectargs = uentryList_size (cl);
2233 ctype last;
2234 int i = 0;
2235
2236 if (expectargs == 0)
2237 {
2238 if (nargs != 0)
2239 {
2240 if (isIter)
2241 {
2242 voptgenerror
2243 (FLG_TYPE,
2244 message ("Iter %q invoked with %d args, "
2245 "declared void",
2246 uentry_getName (fcn),
2247 nargs),
2248 f->loc);
2249 }
2250 else
2251 {
2252 voptgenerror
2253 (FLG_TYPE,
2254 message ("Function %s called with %d args, "
2255 "declared void",
2256 exprNode_unparse (f), nargs),
2257 f->loc);
2258 }
2259 }
2260 return special;
2261 }
2262
2263 last = uentry_getType (uentryList_getN (cl, expectargs - 1));
2264
2265 exprNodeList_reset (args);
2266
2267 uentryList_elements (cl, current)
2268 {
2269 ctype ct = uentry_getType (current);
2270 exprNode a;
2271
2272 if (ctype_isElips (ct))
2273 {
2274 /*
2275 ** do special checking for printf/scanf library functions
2276 **
2277 ** this is kludgey code, just for handling the special case
2278 **
2279 */
2280
2281 if (uentry_isPrintfLike (fcn))
2282 {
2283 checkPrintfArgs (f, fcn, args, ret, i);
2284 special = i;
2285 }
2286 else if (uentry_isScanfLike (fcn))
2287 {
2288 checkScanfArgs (f, fcn, args, ret, i);
2289 special = i;
2290 }
2291 else if (uentry_isMessageLike (fcn))
2292 {
2293 checkMessageArgs (f, fcn, args, i);
2294 special = i;
2295 }
2296 else
2297 {
2298 llassert (!uentry_isSpecialFunction (fcn));
2299 }
2300
2301 nargs = expectargs; /* avoid errors */
2302 break;
2303 }
2304 else
2305 {
2306 if (i >= nargs) break;
2307
2308 a = exprNodeList_current (args);
2309 exprNodeList_advance (args);
2310
2311 i++;
2312
2313 if (exprNode_isError (a))
2314 {
2315 ;
2316 }
2317 else
2318 {
2319 /*
2320 probably necessary? I'm not sure about this one
2321 checkMacroParen (a);
2322 */
2323
2324 f->guards = guardSet_union (f->guards, a->guards);
a0a162cd 2325
2326 DPRINTF (("match arg: %s / %s", ctype_unparse (ct), ctype_unparse (a->typ)));
885824d3 2327
2328 if (!(exprNode_matchArgType (ct, a)))
2329 {
a0a162cd 2330 DPRINTF (("Args mismatch!"));
2331
885824d3 2332 if (ctype_isVoidPointer (ct)
2333 && (ctype_isPointer (a->typ)
2334 && (ctype_isRealAbstract (ctype_baseArrayPtr (a->typ)))))
2335 {
2336 vnoptgenerror
2337 (FLG_ABSTVOIDP,
2338 message
2339 ("Pointer to abstract type (%t) used "
2340 "as void pointer "
2341 "(arg %d to %q): %s",
2342 a->typ, i,
2343 uentry_getName (fcn),
2344 exprNode_unparse (a)),
2345 a->loc);
2346 }
2347 else
2348 {
2349 if (isIter)
2350 {
2351 (void) gentypeerror
2352 (ct, exprNode_undefined,
2353 a->typ, a,
2354 message
2355 ("Iter %q expects arg %d to "
2356 "be %t gets %t: %s",
2357 uentry_getName (fcn),
2358 i, ct, a->typ, exprNode_unparse (a)),
2359 a->loc);
2360 }
2361 else
2362 {
2363 if (gentypeerror
2364 (ct,
2365 exprNode_undefined,
2366 a->typ,
2367 a,
2368 message
2369 ("Function %q expects arg %d to be %t gets %t: %s",
2370 uentry_getName (fcn),
2371 i, ct, a->typ, exprNode_unparse (a)),
2372 a->loc))
2373 {
2374 DPRINTF (("Types: %s / %s",
2375 ctype_unparse (ct),
2376 ctype_unparse (a->typ)));
2377 }
2378
2379 /*
2380 ** Clear null marker for abstract types.
2381 ** (It is not revealed, so suppress future messages.)
2382 */
2383
2384 if (ctype_isAbstract (a->typ))
2385 {
2386 sRef_setNullUnknown (exprNode_getSref (a), a->loc);
2387 }
2388 }
2389 }
2390 }
2391 }
2392 }
2393 } end_uentryList_elements ;
2394
2395
2396 if (expectargs != nargs) /* note: not != since we may have ... */
2397 {
2398 if (ctype_isElips (last))
2399 {
2400 voptgenerror
2401 (FLG_TYPE,
2402 message ("Function %s called with %d args, expects at least %d",
2403 exprNode_unparse (f),
2404 nargs, expectargs - 1),
2405 f->loc);
2406 }
2407 else
2408 {
2409 if (isIter)
2410 {
2411 voptgenerror
2412 (FLG_TYPE,
2413 message ("Iter %q invoked with %d args, expects %d",
2414 uentry_getName (fcn), nargs, expectargs),
2415 f->loc);
2416 }
2417 else
2418 {
2419 voptgenerror
2420 (FLG_TYPE,
2421 message ("Function %s called with %d args, expects %d",
2422 exprNode_unparse (f),
2423 nargs, expectargs),
2424 f->loc);
2425 }
2426 }
2427 }
2428 }
2429 }
2430
2431 return special;
2432}
2433
2434/*
2435** Check for undefined code sequences in function arguments:
2436**
2437** one parameter sets something used by another parameter
2438** one parameter sets something set by another parameter
2439*/
2440
2441static void
2442checkSequencingOne (exprNode f, exprNodeList args,
2443 /*@notnull@*/ exprNode el, int argno)
2444{
2445 /*
2446 ** Do second loop, iff +undefunspec
2447 */
2448
2449 int checkloop;
2450 int numloops = context_maybeSet (FLG_EVALORDERUNCON) ? 2 : 1;
2451
2452 for (checkloop = 0; checkloop < numloops; checkloop++)
2453 {
2454 sRefSet thissets;
2455
2456 if (checkloop == 0)
2457 {
2458 thissets = el->sets;
2459 }
2460 else
2461 {
2462 llassert (checkloop == 1);
2463 thissets = el->msets;
2464 }
2465
2466 sRefSet_realElements (thissets, thisset)
2467 {
2468 int j;
2469
2470 /*@access exprNodeList@*/
2471 for (j = 0; j < args->nelements; j++)
2472 {
2473 exprNode jl = args->elements[j];
2474 int thisargno = j + 1;
2475
2476 if (thisargno != argno && exprNode_isDefined (jl))
2477 {
2478 sRefSet otheruses = jl->uses;
2479
2480 if (sRef_isGlobal (sRef_getRootBase (jl->sref)) &&
2481 sRefSet_hasUnconstrained (thissets))
2482 {
2483 voptgenerror
2484 (FLG_EVALORDERUNCON,
2485 /*@-sefparams@*/
2486 message
2487 ("%q used in argument %d may set "
2488 "global variable %q used by argument %d: %s(%q)",
2489 cstring_capitalizeFree (sRefSet_unparseUnconstrained (thissets)),
2490 /*@=sefparams@*/
2491 argno,
2492 sRef_unparse (sRef_getRootBase (jl->sref)),
2493 thisargno,
2494 exprNode_unparse (f), exprNodeList_unparse (args)),
2495 el->loc);
2496 }
2497
2498 if (sRefSet_member (otheruses, thisset))
2499 {
2500 if (sRef_isUnconstrained (thisset))
2501 {
2502 voptgenerror
2503 (FLG_EVALORDERUNCON,
2504 message
2505 ("Unconstrained functions used in arguments %d (%q) "
2506 "and %d (%s) may modify "
2507 "or use global state in undefined way: %s(%q)",
2508 argno,
2509 sRefSet_unparseUnconstrainedPlain (otheruses),
2510 thisargno,
2511 sRef_unconstrainedName (thisset),
2512 exprNode_unparse (f),
2513 exprNodeList_unparse (args)),
2514 el->loc);
2515 }
2516 else
2517 {
2518 voptgenerror
2519 (FLG_EVALORDER,
2520 message
2521 ("Argument %d modifies %q, used by argument %d "
2522 "(order of evaluation of actual parameters is "
2523 "undefined): %s(%q)",
2524 argno, sRef_unparse (thisset), thisargno,
2525 exprNode_unparse (f), exprNodeList_unparse (args)),
2526 el->loc);
2527 }
2528 }
2529 else
2530 {
2531 sRefSet othersets = jl->sets;
2532
2533 if (sRefSet_member (othersets, thisset))
2534 {
2535 if (sRef_isUnconstrained (thisset))
2536 {
2537 voptgenerror
2538 (FLG_EVALORDERUNCON,
2539 message
2540 ("Unconstrained functions used in "
2541 "arguments %d (%q) and %d (%s) may modify "
2542 "or use global state in undefined way: %s(%q)",
2543 argno,
2544 sRefSet_unparseUnconstrainedPlain (othersets),
2545 thisargno,
2546 sRef_unconstrainedName (thisset),
2547 exprNode_unparse (f), exprNodeList_unparse (args)),
2548 el->loc);
2549 }
2550 else
2551 {
2552 voptgenerror
2553 (FLG_EVALORDER,
2554 message
2555 ("Argument %d modifies %q, set by argument %d (order of"
2556 " evaluation of actual parameters is undefined): %s(%q)",
2557 argno, sRef_unparse (thisset), thisargno,
2558 exprNode_unparse (f), exprNodeList_unparse (args)),
2559 el->loc);
2560 }
2561 }
2562 }
2563 }
2564 }
2565 /*@noaccess exprNodeList@*/
2566 } end_sRefSet_realElements;
2567 }
2568}
2569
2570static void
2571checkSequencing (exprNode f, exprNodeList args)
2572{
2573 if (exprNodeList_size (args) > 1)
2574 {
2575 int i;
2576 exprNode el;
2577
2578 /*@access exprNodeList*/
2579
2580 for (i = 0; i < args->nelements; i++)
2581 {
2582 el = args->elements[i];
2583
2584 if (!exprNode_isError (el))
2585 {
2586 checkSequencingOne (f, args, el, i + 1);
2587 }
2588 }
2589 /*@noaccess exprNodeList*/
2590 }
2591}
2592
2593/*
2594** requires le = exprNode_getUentry (f)
2595*/
2596
2597static void
2598checkGlobMods (/*@notnull@*/ /*@dependent@*/ exprNode f,
2599 uentry le, exprNodeList args,
2600 /*@notnull@*/ exprNode ret, int specialArgs)
2601{
2602 bool isSpec = FALSE;
2603 bool hasMods = FALSE;
2604 cstring fname;
2605 globSet usesGlobs = globSet_undefined;
2606 sRefSet mods = sRefSet_undefined;
2607 bool freshMods = FALSE;
2608 uentryList params = uentryList_undefined;
2609
2610 /*
2611 ** check globals and modifies
2612 */
2613
2614 setCodePoint ();
2615
2616 if (!uentry_isValid (le))
2617 {
2618 ctype fr = ctype_realType (f->typ);
2619
2620 if (ctype_isFunction (fr))
2621 {
2622 params = ctype_argsFunction (fr);
2623 }
2624 else
2625 {
2626 params = uentryList_missingParams;
2627 }
2628
2629 if (!context_getFlag (FLG_MODNOMODS)
2630 && !context_getFlag (FLG_GLOBUNSPEC))
2631 {
2632 checkUnspecCall (f, params, args);
2633 }
2634
2635 return;
2636 }
2637
2638 fname = uentry_rawName (le);
2639
2640 setCodePoint ();
2641
2642 if (uentry_isFunction (le))
2643 {
2644 params = uentry_getParams (le);
2645 mods = uentry_getMods (le);
2646 hasMods = uentry_hasMods (le);
2647 usesGlobs = uentry_getGlobs (le);
2648 isSpec = uentry_isSpecified (le);
2649 }
2650 else /* not a function */
2651 {
2652 ctype ct = ctype_realType (uentry_getType (le));
2653
2654 llassertprint (uentry_isVar (le) && ctype_isFunction (ct),
2655 ("checkModGlobs: uentry not a function: %s",
2656 uentry_unparse (le)));
2657
2658 params = ctype_argsFunction (ct);
2659 }
2660
2661 /*
2662 ** check globals
2663 */
2664
2665 setCodePoint ();
2666
2667
2668 globSet_allElements (usesGlobs, el)
2669 {
2670 if (sRef_isValid (el))
2671 {
2672 if (sRef_isInternalState (el) || sRef_isSystemState (el))
2673 {
2674 context_usedGlobal (el);
2675 exprNode_checkUse (f, el, f->loc);
2676
2677 if (context_checkInternalUse ())
2678 {
2679 if (!context_globAccess (el))
2680 {
2681 if (sRef_isSystemState (el)
2682 && !context_getFlag (FLG_MODFILESYSTEM))
2683 {
2684 ;
2685 }
2686 else
2687 {
2688 voptgenerror
2689 (FLG_INTERNALGLOBS,
2690 message
2691 ("Called procedure %s may access %q, but "
2692 "globals list does not include globals %s",
2693 exprNode_unparse (f),
2694 sRef_unparse (el),
2695 cstring_makeLiteralTemp (sRef_isInternalState (el)
2696 ? "internalState"
2697 : "fileSystem")),
2698 f->loc);
2699 }
2700 }
2701 }
2702 }
2703 else if (sRef_isNothing (el) || sRef_isSpecState (el))
2704 {
2705 ;
2706 }
2707 else
2708 {
2709 uentry gle = sRef_getUentry (el);
2710 sRef sr = sRef_updateSref (el);
2711
2712 if (sRef_isUndefGlob (el))
2713 {
2714 sRef_setDefined (sr, f->loc);
2715 exprNode_checkSet (f, sr);
2716 }
2717 else
2718 {
2719 /*
2720 ** check definition
2721 */
2722
2723 if (sRef_isAllocated (el))
2724 {
2725 exprNode_checkSet (f, sr);
2726 }
2727 else
2728 {
2729 if (sRef_isStateUndefined (sr))
2730 {
2731 voptgenerror
2732 (FLG_GLOBSTATE,
2733 message
2734 ("%s %q used by function undefined before call: %s",
2735 sRef_getScopeName (sr),
2736 sRef_unparse (sr),
2737 exprNode_unparse (f)),
2738 f->loc);
2739 sRef_setDefined (sr, f->loc);
2740 }
2741 exprNode_checkUse (f, sr, f->loc);
2742 }
2743
2744 checkGlobUse (gle, TRUE, f);
2745 }
2746
2747 if (sRef_isKilledGlob (el))
2748 {
2749 sRef_kill (sr, f->loc);
2750 context_usedGlobal (sr);
2751 }
2752 }
2753 }
2754 } end_globSet_allElements;
2755
2756 /*
2757 ** check modifies
2758 */
2759
2760 if (context_hasMods () || context_getFlag (FLG_MODNOMODS))
2761 {
2762 sRefSet smods = sRefSet_undefined;
2763
2764 /*
2765 ** NEED to check for modifies anything
2766 */
2767
2768 /*
2769 ** check each sRef that called function modifies (ml), is
2770 ** modifiable by tl
2771 */
2772
2773 setCodePoint ();
2774
2775 sRefSet_allElements (mods, s) /* s is something which may be modified */
2776 {
2777 if (sRef_isKindSpecial (s))
2778 {
2779 if (sRef_isSpecInternalState (s))
2780 {
2781 if (context_getFlag (FLG_MODINTERNALSTRICT))
2782 {
2783 exprNode_checkCallModifyVal (s, args, f, ret);
2784 }
2785 else
2786 {
2787 sRefSet mmods = context_modList ();
2788
2789 sRefSet_allElements (mmods, el)
2790 {
2791 if (sRef_isInternalState (el))
2792 {
2793 sRef_setModified (el);
2794 }
2795 } end_sRefSet_allElements ;
2796 }
2797 }
2798 else
2799 {
2800 exprNode_checkCallModifyVal (s, args, f, ret);
2801 }
2802 }
2803 else
2804 {
2805 sRef rb = sRef_getRootBase (s);
2806
2807 if (sRef_isGlobal (rb))
2808 {
2809 context_usedGlobal (rb);
2810 }
2811
2812 if (sRef_isFileStatic (s)
2813 && !fileId_equal (fileloc_fileId (f->loc),
2814 fileloc_fileId (uentry_whereDefined (le))))
2815 {
2816 smods = sRefSet_insert (smods, s);
2817 }
2818 else
2819 {
2820 exprNode_checkCallModifyVal (s, args, f, ret);
2821 }
2822 }
2823 } end_sRefSet_allElements;
2824
2825 setCodePoint ();
2826
2827 /*
2828 ** Static elements in modifies set can have nasty consequences.
2829 ** (I think...have not been able to reproduce a possible bug.)
2830 */
2831
2832 if (!sRefSet_isDefined (smods))
2833 {
2834 mods = sRefSet_newCopy (mods);
2835 freshMods = TRUE;
2836
2837 sRefSet_allElements (smods, el)
2838 {
2839 bool res = sRefSet_delete (mods, el);
2840
2841 llassert (res);
2842 } end_sRefSet_allElements;
2843
2844 sRefSet_free (smods);
2845 /*@-branchstate@*/
2846 }
2847 /*@=branchstate@*/
2848 }
2849 else if (sRefSet_isDefined (mods))
2850 { /* just check observers */
2851 setCodePoint ();
2852
2853 sRefSet_allElements (mods, s) /* s is something which may be modified */
2854 {
2855 sRef rb = sRef_getRootBase (s);
2856
2857 setCodePoint ();
2858
2859 if (sRef_isParam (rb))
2860 {
2861 sRef b = sRef_fixBaseParam (s, args);
2862
2863 if (sRef_isObserver (b))
2864 {
2865 exprNode e = exprNodeList_nth (args, sRef_getParam (rb));
2866
2867 if (optgenerror
2868 (FLG_MODOBSERVER,
2869 message ("Function call may modify observer%q: %s",
2870 sRef_unparsePreOpt (b), exprNode_unparse (e)),
2871 exprNode_loc (e)))
2872 {
2873 sRef_showExpInfo (b);
2874 }
2875 }
2876 }
2877 } end_sRefSet_allElements;
2878 }
2879 else
2880 {
2881 if (!hasMods) /* no specified modifications */
2882 {
2883 if (context_getFlag (FLG_MODOBSERVERUNCON))
2884 {
2885 exprNodeList_elements (args, e)
2886 {
2887 if (exprNode_isDefined (e))
2888 {
2889 sRef s = exprNode_getSref (e);
2890
2891 if (sRef_isObserver (s)
2892 && ctype_isMutable (sRef_getType (s)))
2893 {
2894 if (optgenerror
2895 (FLG_MODOBSERVERUNCON,
2896 message
2897 ("Call to unconstrained function %s may modify observer%q: %s",
2898 exprNode_unparse (f),
2899 sRef_unparsePreOpt (s), exprNode_unparse (e)),
2900 exprNode_loc (e)))
2901 {
2902 sRef_showExpInfo (s);
2903 }
2904 }
2905 }
2906 } end_exprNodeList_elements;
2907 }
2908 }
2909 }
2910
2911 checkAnyCall (f, fname, params, args, hasMods, mods, isSpec, specialArgs);
2912
2913 ret->uses = sRefSet_union (ret->uses, f->uses);
2914 ret->sets = sRefSet_union (ret->sets, f->sets);
2915 ret->msets = sRefSet_union (ret->msets, f->msets);
2916
2917 if (freshMods)
2918 {
2919 /*
2920 ** Spurious errors reported, because lclint can't tell
2921 ** mods must be fresh if freshMods is true.
2922 */
2923
2924 /*@i@*/ sRefSet_free (mods);
2925 }
2926
2927 setCodePoint ();
2928}
2929
2930void checkGlobUse (uentry glob, bool isCall, /*@notnull@*/ exprNode e)
2931{
2932 if (uentry_isVar (glob))
2933 {
2934 if (context_inFunctionLike ())
2935 {
2936 sRef sr = uentry_getSref (glob);
2937
2938 context_usedGlobal (sr);
2939
2940 if (context_checkGlobUse (glob))
2941 {
2942 if (!context_globAccess (sr))
2943 {
2944 if (isCall)
2945 {
2946 voptgenerror
2947 (FLG_GLOBALS,
2948 message ("Called procedure %s may access %s %q",
2949 exprNode_unparse (e),
2950 sRef_unparseScope (sr),
2951 uentry_getName (glob)),
2952 e->loc);
2953 }
2954 else
2955 {
2956 voptgenerror
2957 (FLG_GLOBALS,
2958 message ("Undocumented use of %s %s",
2959 sRef_unparseScope (sr),
2960 exprNode_unparse (e)),
2961 e->loc);
2962 }
2963 }
2964 }
2965 }
2966 }
2967 else
2968 {
2969 llbug (message ("Global not variable: %q", uentry_unparse (glob)));
2970 }
2971}
2972
2973static /*@only@*/ exprNode
2974functionCallSafe (/*@only@*/ /*@notnull@*/ exprNode f,
2975 ctype t, /*@keep@*/ exprNodeList args)
2976{
2977 /* requires f is a non-error exprNode, with type function */
2978 cstring fname = exprNode_unparse (f);
2979 uentry le = exprNode_getUentry (f);
2980 exprNode ret = exprNode_createPartialCopy (f);
2981 int special;
2982
2983 setCodePoint ();
2984
2985 ret->typ = ctype_returnValue (t);
2986 ret->kind = XPR_CALL;
2987
2988 ret->edata = exprData_makeCall (f, args);
2989
2990 /*
2991 ** Order of these steps is very important!
2992 **
2993 ** Must check for argument dependencies before messing up uses and sets.
2994 */
2995
2996 if (context_getFlag (FLG_EVALORDER))
2997 {
2998 exprNodeList_elements (args, current)
2999 {
3000 if (exprNode_isDefined (current))
3001 {
3002 exprNode_addUse (current, current->sref);
3003 }
3004 } end_exprNodeList_elements;
3005
3006 if (context_maybeSet (FLG_EVALORDER) || context_maybeSet (FLG_EVALORDERUNCON))
3007 {
3008 checkSequencing (f, args);
3009 }
3010
3011 exprNodeList_elements (args, current)
3012 {
3013 if (exprNode_isDefined (current) && sRef_isMeaningful (current->sref))
3014 {
3015 exprNode_addUse (ret, sRef_makeDerived (current->sref));
3016 }
3017 } end_exprNodeList_elements ;
3018 }
3019
3020 special = checkArgs (le, f, t, args, ret);
3021 checkGlobMods (f, le, args, ret, special);
3022
3023 setCodePoint ();
3024
3025 if (uentry_isValid (le)
3026 && (uentry_isFunction (le)
3027 || (uentry_isVariable (le)
3028 && ctype_isFunction (uentry_getType (le)))))
3029 {
3030 exitkind exk = uentry_getExitCode (le);
3031
3032 /* f->typ is already set to the return type */
3033
3034 ret->sref = uentry_returnedRef (le, args);
3035
3036 if (uentry_isFunction (le) && exprNodeList_size (args) >= 1)
3037 {
3038 qual nullPred = uentry_nullPred (le);
3039
3040 if (qual_isTrueNull (nullPred))
3041 {
3042 exprNode arg = exprNodeList_head (args);
3043
3044 if (exprNode_isDefined (arg))
3045 {
3046 ret->guards = guardSet_addFalseGuard (ret->guards, arg->sref);
3047 }
3048 }
3049 else if (qual_isFalseNull (nullPred))
3050 {
3051 exprNode arg = exprNodeList_head (args);
3052
3053 if (exprNode_isDefined (arg))
3054 {
3055 ret->guards = guardSet_addTrueGuard (ret->guards, arg->sref);
3056 }
3057 }
3058 else
3059 {
3060 llassert (qual_isUnknown (nullPred));
3061 }
3062 }
3063
3064 if (exitkind_isConditionalExit (exk))
3065 {
3066 /*
3067 ** True exit is:
3068 ** if (arg0) then { exit! } else { ; }
3069 ** False exit is:
3070 ** if (arg0) then { ; } else { exit! }
3071 */
3072
3073 exprNode firstArg;
3074
3075 llassert (!exprNodeList_isEmpty (args));
3076 firstArg = exprNodeList_head (args);
3077
3078 if (exprNode_isDefined (firstArg)
3079 && !guardSet_isEmpty (firstArg->guards))
3080 {
3081 usymtab_trueBranch (guardSet_undefined);
3082 usymtab_altBranch (guardSet_undefined);
3083
3084 if (exitkind_isTrueExit (exk))
3085 {
3086 usymtab_popBranches (firstArg,
3087 exprNode_makeMustExit (),
3088 exprNode_undefined,
3089 TRUE, TRUEEXITCLAUSE);
3090 }
3091 else
3092 {
3093 usymtab_popBranches (firstArg,
3094 exprNode_undefined,
3095 exprNode_makeMustExit (),
3096 TRUE, FALSEEXITCLAUSE);
3097 }
3098 }
3099
3100 ret->exitCode = XK_MAYEXIT;
3101 }
3102 else if (exitkind_mustExit (exk))
3103 {
3104 ret->exitCode = XK_MUSTEXIT;
3105 }
3106 else if (exitkind_couldExit (exk))
3107 {
3108 ret->exitCode = XK_MAYEXIT;
3109 }
3110 else
3111 {
3112 ;
3113 }
3114
3115 if (cstring_equalLit (fname, "exit"))
3116 {
3117 if (exprNodeList_size (args) == 1)
3118 {
3119 exprNode arg = exprNodeList_head (args);
3120
3121 if (exprNode_isDefined (arg) && exprNode_knownIntValue (arg))
3122 {
3123 long int val = multiVal_forceInt (exprNode_getValue (arg));
3124
3125 if (val != 0)
3126 {
3127 voptgenerror
3128 (FLG_EXITARG,
3129 message
3130 ("Argument to exit has implementation defined behavior: %s",
3131 exprNode_unparse (arg)),
3132 exprNode_loc (arg));
3133 }
3134 }
3135 }
3136 }
3137 }
3138 else
3139 {
3140 ret->sref = defref;
3141 exprNode_checkSetAny (ret, uentry_rawName (le));
3142 }
3143
3144 return (ret);
3145}
3146
3147/*
3148** this is yucky! should keep the uentry as part of exprNode!
3149*/
3150
3151/*@observer@*/ uentry
3152exprNode_getUentry (exprNode e)
3153{
3154 if (exprNode_isError (e))
3155 {
3156 return uentry_undefined;
3157 }
3158 else
3159 {
3160 cstring s = exprNode_rootVarName (e);
3161 uentry ue = usymtab_lookupSafe (s);
3162
3163 return ue;
3164 }
3165}
3166
3167exprNode
3168exprNode_makeInitBlock (lltok brace, /*@only@*/ exprNodeList inits)
3169{
3170 exprNode ret = exprNode_createPlain (ctype_unknown);
3171
3172 ret->kind = XPR_INITBLOCK;
3173 ret->edata = exprData_makeCall (exprNode_undefined, inits);
3174 ret->loc = fileloc_update (ret->loc, lltok_getLoc (brace));
3175
3176 return (ret);
3177}
3178
3179exprNode
3180exprNode_functionCall (/*@only@*/ exprNode f, /*@only@*/ exprNodeList args)
3181{
3182 ctype t;
3183
3184 setCodePoint ();
3185
3186 if (exprNode_isUndefined (f))
3187 {
3188 exprNode_free (f);
3189 exprNodeList_free (args);
3190 return exprNode_undefined;
3191 }
3192
3193 t = exprNode_getType (f);
3194
3195 if (sRef_isLocalVar (f->sref))
3196 {
3197 exprNode_checkUse (f, f->sref, f->loc);
3198
3199 if (sRef_possiblyNull (f->sref))
3200 {
3201 if (!usymtab_isGuarded (f->sref))
3202 {
3203 if (optgenerror (FLG_NULLDEREF,
3204 message ("Function call using %s pointer %q",
3205 sRef_nullMessage (f->sref),
3206 sRef_unparse (f->sref)),
3207 f->loc))
3208 {
3209 sRef_showNullInfo (f->sref);
3210 sRef_setNullError (f->sref);
3211 }
3212 }
3213 }
3214 }
3215
3216 setCodePoint ();
3217
3218 if (ctype_isRealFunction (t))
3219 {
3220 exprNode ret = functionCallSafe (f, t, args);
3221 setCodePoint ();
3222 return ret;
3223 }
3224 else if (ctype_isUnknown (t))
3225 {
3226 exprNode ret = exprNode_createPartialCopy (f);
3227 cstring tstring;
3228
3229 setCodePoint ();
3230
3231 ret->typ = t;
3232 exprNodeList_elements (args, current)
3233 {
3234 if (exprNode_isDefined (current))
3235 {
3236 exprNode_checkUse (ret, current->sref, ret->loc);
3237
3238 /*
3239 ** also, anything derivable from current->sref may be used
3240 */
3241
3242 exprNode_addUse (ret, sRef_makeDerived (current->sref));
3243 exprNode_mergeUSs (ret, current);
3244 }
3245 } end_exprNodeList_elements;
3246
3247 ret->edata = exprData_makeCall (f, args);
3248 ret->kind = XPR_CALL;
3249
3250 tstring = cstring_copy (exprNode_unparse (f));
3251
3252 cstring_markOwned (tstring);
3253 exprNode_checkSetAny (ret, tstring);
3254
3255 return (ret);
3256 }
3257 else
3258 {
3259 voptgenerror (FLG_TYPE,
3260 message ("Call to non-function (type %t): %s", t,
3261 exprNode_unparse (f)),
3262 f->loc);
3263 exprNode_free (f);
3264 exprNodeList_free (args);
3265
3266 return (exprNode_makeError ());
3267 }
3268}
3269
3270exprNode
3271exprNode_fieldAccess (/*@only@*/ exprNode s, /*@only@*/ cstring f)
3272{
3273 exprNode ret = exprNode_createPartialCopy (s);
3274
3275 ret->kind = XPR_FACCESS;
3276
3277 if (exprNode_isError (s))
3278 {
3279 ret->edata = exprData_makeField (s, f);
3280 return ret;
3281 }
3282 else
3283 {
3284 ctype t = exprNode_getType (s);
3285 ctype tr = ctype_realType (t);
3286
3287 checkMacroParen (s);
3288
3289 ret->edata = exprData_makeField (s, f);
3290
3291 if (ctype_isStructorUnion (tr))
3292 {
3293 uentry tf = uentryList_lookupField (ctype_getFields (tr), f);
3294
3295 if (uentry_isUndefined (tf))
3296 {
3297 voptgenerror (FLG_TYPE,
3298 message ("Access non-existent field %s of %t: %s", f, t,
3299 exprNode_unparse (ret)),
3300 s->loc);
3301
3302 return (ret);
3303 }
3304 else
3305 {
3306 uentry_setUsed (tf, exprNode_loc (ret));
3307
3308 ret->typ = uentry_getType (tf);
3309 checkSafeUse (ret, s->sref);
3310
3311 ret->sref = sRef_makeField (s->sref, uentry_rawName (tf));
3312 return (ret);
3313 }
3314 }
3315 else /* isStructorUnion */
3316 {
3317 if (ctype_isRealAbstract (tr))
3318 {
3319 voptgenerror
3320 (FLG_ABSTRACT,
3321 message ("Access field of abstract type (%t): %s.%s",
3322 t, exprNode_unparse (s), f),
3323 s->loc);
3324 ret->typ = ctype_unknown;
3325 }
3326 else
3327 {
3328 if (ctype_isKnown (tr))
3329 {
3330 voptgenerror
3331 (FLG_TYPE,
3332 message
3333 ("Access field of non-struct or union (%t): %s.%s",
3334 t, exprNode_unparse (s), f),
3335 s->loc);
3336
3337 ret->typ = ctype_unknown;
3338 }
3339 else
3340 {
3341 cstring sn = cstring_copy (f);
3342
3343 checkSafeUse (ret, s->sref);
3344 cstring_markOwned (sn);
3345 ret->sref = sRef_makeField (s->sref, sn);
3346
3347 return (ret);
3348 }
3349 }
3350 return (ret);
3351 }
3352 }
3353 BADEXIT;
3354}
3355
3356exprNode
3357exprNode_addParens (/*@only@*/ lltok lpar, /*@only@*/ exprNode e)
3358{
3359 exprNode ret = exprNode_createPartialCopy (e);
3360
3361 ret->loc = fileloc_update (ret->loc, lltok_getLoc (lpar));
3362 ret->kind = XPR_PARENS;
3363 ret->edata = exprData_makeUop (e, lpar);
3364
3365 if (!exprNode_isError (e))
3366 {
3367 ret->exitCode = e->exitCode;
3368 ret->canBreak = e->canBreak;
3369 ret->mustBreak = e->mustBreak;
3370 ret->isJumpPoint = e->isJumpPoint;
3371 ret->sref = e->sref;
3372 }
3373
3374 return ret;
3375}
3376
3377exprNode
3378exprNode_arrowAccess (/*@only@*/ exprNode s, /*@only@*/ cstring f)
3379{
3380 exprNode ret = exprNode_createPartialCopy (s);
3381
3382 ret->edata = exprData_makeField (s, f);
3383 ret->kind = XPR_ARROW;
3384
3385 if (exprNode_isError (s))
3386 {
3387 return (ret);
3388 }
3389 else
3390 {
3391 ctype t = exprNode_getType (s);
3392 ctype tr = ctype_realType (t);
3393
3394 checkMacroParen (s);
3395
3396 (void) ctype_fixArrayPtr (tr); /* REWRITE THIS */
3397
3398 if (ctype_isRealPointer (tr))
3399 {
3400 ctype b = ctype_realType (ctype_baseArrayPtr (tr));
3401
3402 if (ctype_isStructorUnion (b))
3403 {
3404 uentry fentry = uentryList_lookupField (ctype_getFields (b), f);
3405
3406 if (sRef_isKnown (s->sref) && sRef_possiblyNull (s->sref))
3407 {
3408 if (!usymtab_isGuarded (s->sref) && !context_inProtectVars ())
3409 {
3410 if (optgenerror
3411 (FLG_NULLDEREF,
3412 message ("Arrow access from %s pointer%q: %s",
3413 sRef_nullMessage (s->sref),
3414 sRef_unparsePreOpt (s->sref),
3415 exprNode_unparse (ret)),
3416 s->loc))
3417 {
3418 sRef_showNullInfo (s->sref);
3419 sRef_setNullError (s->sref);
3420 }
3421 }
3422 }
3423
3424 if (uentry_isUndefined (fentry))
3425 {
3426 voptgenerror
3427 (FLG_TYPE,
3428 message ("Access non-existent field %s of %t: %s",
3429 f, t, exprNode_unparse (ret)),
3430 s->loc);
3431 ret->typ = ctype_unknown;
3432
3433 return (ret);
3434 }
3435 else
3436 {
3437 /*
3438 ** was safeUse: shouldn't be safe!
3439 **
3440 ** to do rec->field
3441 ** rec must be defined,
3442 ** *rec must be allocated
3443 ** rec->field need only be defined it if is an rvalue
3444 */
3445
3446 uentry_setUsed (fentry, exprNode_loc (ret));
3447 ret->typ = uentry_getType (fentry);
3448
3449 exprNode_checkUse (ret, s->sref, s->loc);
3450
3451 /* exprNode_checkUse (ret, sRef_makePointer (s->sref), s->loc); */
3452 ret->sref = sRef_makeArrow (s->sref, uentry_rawName (fentry));
3453 return (ret);
3454 }
3455 }
3456 else /* Pointer to something that is not a struct or union*/
3457 {
3458 if (ctype_isRealAbstract (tr))
3459 {
3460 ctype xrt = ctype_forceRealType (tr);
3461
3462 voptgenerror
3463 (FLG_ABSTRACT,
3464 message ("Arrow access field of abstract type (%t): %s->%s",
3465 t, exprNode_unparse (s), f),
3466 s->loc);
3467
3468 /*
3469 ** Set the state correctly, as if the abstraction is broken.
3470 */
3471
3472 if (ctype_isRealPointer (xrt) &&
3473 (b = ctype_realType (ctype_baseArrayPtr (xrt)),
3474 ctype_isStructorUnion (b)))
3475 {
3476 uentry fentry = uentryList_lookupField (ctype_getFields (b), f);
3477 ret->typ = uentry_getType (fentry);
3478 ret->sref = sRef_makeArrow (s->sref, uentry_rawName (fentry));
3479 }
3480 else
3481 {
3482 ret->typ = ctype_unknown;
3483 ret->sref = sRef_undefined;
3484 }
3485 }
3486 else /* not a struct, union or abstract */
3487 {
3488 if (ctype_isUnknown (tr)) {
3489 cstring sn = cstring_copy (f);
3490
3491 DPRINTF (("Here: %s", exprNode_unparse (s)));
3492
3493 exprNode_checkUse (ret, s->sref, s->loc);
3494 exprNode_checkUse (ret, sRef_makePointer (s->sref), s->loc);
3495
3496 cstring_markOwned (sn);
3497 ret->sref = sRef_makeArrow (s->sref, sn);
3498
3499 ret->kind = XPR_ARROW;
3500 return (ret);
3501 } else {
3502 voptgenerror
3503 (FLG_TYPE,
3504 message ("Arrow access field of non-struct or union "
3505 "pointer (%t): %s->%s",
3506 t, exprNode_unparse (s), f),
3507 s->loc);
3508
3509 ret->typ = ctype_unknown;
3510 ret->sref = sRef_undefined;
3511 }
3512 }
3513 }
3514 }
3515 else /* its not a pointer */
3516 {
3517 if (!ctype_isUnknown (tr))
3518 {
3519 voptgenerror
3520 (FLG_TYPE,
3521 message ("Arrow access of non-pointer (%t): %s->%s",
3522 t, exprNode_unparse (s), f),
3523 s->loc);
3524
3525 ret->typ = ctype_unknown;
3526 ret->sref = sRef_undefined;
3527 }
3528 else
3529 {
3530 cstring sn = cstring_copy (f);
3531
3532 DPRINTF (("Here: %s", exprNode_unparse (s)));
3533
3534 exprNode_checkUse (ret, s->sref, s->loc);
3535 exprNode_checkUse (ret, sRef_makePointer (s->sref), s->loc);
3536
3537 cstring_markOwned (sn);
3538 ret->sref = sRef_makeArrow (s->sref, sn);
3539
3540 ret->kind = XPR_ARROW;
3541 return (ret);
3542 }
3543 }
3544
3545 return (ret);
3546 }
3547 BADEXIT;
3548}
3549
3550/*
3551** only postOp's in C: i++ and i--
3552*/
3553
3554exprNode
3555exprNode_postOp (/*@only@*/ exprNode e, /*@only@*/ lltok op)
3556{
3557 /* check modification also */
3558 /* cstring opname = lltok_unparse (op);*/
3559 ctype t;
3560 exprNode ret = exprNode_createPartialCopy (e);
3561
3562 ret->loc = fileloc_update (ret->loc, lltok_getLoc (op));
3563 ret->kind = XPR_POSTOP;
3564 ret->edata = exprData_makeUop (e, op);
3565
3566 if (!exprNode_isDefined (e))
3567 {
3568 return ret;
3569 }
3570
3571 checkMacroParen (e);
3572
3573 exprNode_checkUse (ret, e->sref, e->loc);
3574 exprNode_checkSet (ret, e->sref);
3575
3576 t = exprNode_getType (e);
3577
3578 if (sRef_isUnsafe (e->sref))
3579 {
3580 voptgenerror (FLG_MACROPARAMS,
3581 message ("Operand of %s is macro parameter (non-functional): %s%s",
3582 lltok_unparse (op), exprNode_unparse (e), lltok_unparse (op)),
3583 e->loc);
3584 sRef_makeSafe (e->sref);
3585 sRef_makeSafe (ret->sref);
3586 }
3587
3588 if (ctype_isForceRealNumeric (&t) || ctype_isRealAP (t))
3589 {
3590 ret->typ = e->typ;
3591 }
3592 else
3593 {
3594 if (ctype_isRealAbstract (t))
3595 {
3596 voptgenerror
3597 (FLG_ABSTRACT,
3598 message ("Operand of %s is abstract type (%t): %s",
3599 lltok_unparse (op), t, exprNode_unparse (e)),
3600 e->loc);
3601 }
3602 else
3603 {
3604 voptgenerror
3605 (FLG_TYPE,
3606 message ("Operand of %s is non-numeric (%t): %s",
3607 lltok_unparse (op), t, exprNode_unparse (e)),
3608 e->loc);
3609 }
3610 ret->typ = ctype_unknown;
3611 }
3612
3613 /* if (ctype_isZero (t)) e->typ = ctype_int; */
3614
3615 exprNode_checkModify (e, ret);
3616
a0a162cd 3617 /* added 7/11/2000 D.L */
3618
3619 updateEnvironmentForPostOp (e);
3620
1ac6313d 3621 /* start modifications */
3622 /* added by Seejo on 4/16/2000 */
3623
3624 /* Arithmetic operations on pointers wil modify the size/len/null terminated
3625 status */
3626 if ((sRef_isPossiblyNullTerminated (e->sref)) || (sRef_isNullTerminated(e->sref))) {
3627
3628 ret->sref = sRef_copy (e->sref);
3629
3630 /* Operator : ++ */
3631 if (lltok_getTok (op) == INC_OP) {
3632 if (sRef_getSize(e->sref) > 0) {
3633
3634 sRef_setSize (ret->sref, sRef_getSize(e->sref) - 1);
3635
3636 if (sRef_getLen(e->sref) == 1) { /* i.e. the first character is \0 */
3637 /* Assumption: there is only 1 \0 in the buffer */
3638 /* This will not be correct if there are 2 \0's in the buffer */
3639 sRef_setNotNullTerminatedState(ret->sref);
3640 sRef_resetLen(ret->sref);
3641 } else {
3642 sRef_setNullTerminatedState(ret->sref);
3643 sRef_setLen (ret->sref, sRef_getLen(e->sref) - 1);
3644 }
3645 if (sRef_isNullTerminated (ret->sref))
3646 printf ("ret->sref is Null Terminated\n");
3647 else if (sRef_isPossiblyNullTerminated (ret->sref))
3648 printf ("ret->sref is Possibly Null Terminated\n");
3649 else if (sRef_isNotNullTerminated (ret->sref))
3650 printf ("ret->sref is Not Null Terminated\n");
3651 }
3652 }
3653
3654 /* Operator : -- */
3655 if (lltok_getTok (op) == DEC_OP) {
3656 if (sRef_getSize(e->sref) >= 0) {
3657 sRef_setSize (ret->sref, sRef_getSize(e->sref) + 1);
3658 sRef_setLen (ret->sref, sRef_getLen(e->sref) + 1);
3659 }
3660 }
3661 }
3662
3663 /* end modifications */
3664
885824d3 3665 return ret;
3666}
3667
3668exprNode
3669exprNode_preOp (/*@only@*/ exprNode e, /*@only@*/ lltok op)
3670{
3671 bool checkMod = FALSE;
3672 ctype te, tr;
3673 int opid = lltok_getTok (op);
3674 exprNode ret = exprNode_createSemiCopy (e);
3675
3676 exprNode_copySets (ret, e);
3677
3678 multiVal_free (ret->val);
3679 ret->val = multiVal_undefined;
3680 ret->loc = fileloc_update (ret->loc, lltok_getLoc (op));
3681 ret->kind = XPR_PREOP;
3682 ret->edata = exprData_makeUop (e, op);
3683
3684 if (exprNode_isError (e))
3685 {
3686 return ret;
3687 }
3688
3689 checkMacroParen (e);
3690
3691 te = exprNode_getType (e);
3692 tr = ctype_realType (te);
3693
3694 if (opid != TAMPERSAND)
3695 {
3696 exprNode_checkUse (ret, e->sref, e->loc);
3697
3698 if (ctype_isRealAbstract (tr)
3699 && (!(ctype_isRealBool (te) && (opid == TEXCL))))
3700 {
3701 if (optgenerror (FLG_ABSTRACT,
3702 message ("Operand of %s is abstract type (%t): %s",
3703 lltok_unparse (op), tr,
3704 exprNode_unparse (ret)),
3705 e->loc))
3706 {
3707 tr = te = ctype_unknown;
3708 ret->typ = ctype_unknown;
3709 sRef_setNullError (e->sref);
3710 }
3711 }
3712 }
3713
3714 switch (opid)
3715 {
3716 case INC_OP:
3717 case DEC_OP: /* should also check modification! */
3718
3719 if (sRef_isMacroParamRef (e->sref))
3720 {
3721 voptgenerror
3722 (FLG_MACROPARAMS,
3723 message ("Operand of %s is macro parameter (non-functional): %s",
3724 lltok_unparse (op), exprNode_unparse (ret)),
3725 e->loc);
3726 }
3727 else
3728 {
3729 exprNode_checkSet (ret, e->sref);
3730 }
3731
3732 if (ctype_isForceRealNumeric (&tr) || ctype_isRealAP (tr))
3733 {
3734 }
3735 else
3736 {
3737 if (context_msgStrictOps ())
3738 {
3739 voptgenerror
3740 (FLG_STRICTOPS,
3741 message ("Operand of %s is non-numeric (%t): %s",
3742 lltok_unparse (op), te, exprNode_unparse (ret)),
3743 e->loc);
3744 }
3745 ret->typ = ctype_int;
3746 }
1ac6313d 3747
3748 /* start modifications */
3749 /* added by Seejo on 4/16/2000 */
3750
3751 /* Arithmetic operations on pointers wil modify the size/len/null terminated
3752 status */
3753 if ((sRef_isPossiblyNullTerminated (e->sref)) || (sRef_isNullTerminated(e->sref))) {
3754
3755 ret->sref = sRef_copy (e->sref);
3756
3757 /* Operator : ++ */
3758 if (lltok_getTok (op) == INC_OP) {
3759 if (sRef_getSize(e->sref) > 0) {
3760
3761 sRef_setSize (ret->sref, sRef_getSize(e->sref) - 1);
3762
3763 if (sRef_getLen(e->sref) == 1) { /* i.e. the first character is \0 */
3764 /* Assumption: there is only 1 \0 in the buffer */
3765 /* This will not be correct if there are 2 \0's in the buffer */
3766 sRef_setNotNullTerminatedState(ret->sref);
3767 sRef_resetLen (ret->sref);
3768 } else {
3769 sRef_setNullTerminatedState(ret->sref);
3770 sRef_setLen (ret->sref, sRef_getLen(e->sref) - 1);
3771 }
3772 }
3773 }
3774
3775 /* Operator : -- */
3776 if (lltok_getTok (op) == DEC_OP) {
3777 if (sRef_getSize(e->sref) >= 0) {
3778 sRef_setSize (ret->sref, sRef_getSize(e->sref) + 1);
3779 sRef_setLen (ret->sref, sRef_getLen(e->sref) + 1);
3780 }
3781 }
3782 }
3783
3784 /* end modifications */
3785
885824d3 3786 checkMod = TRUE;
3787 break;
3788
3789 case TMINUS:
3790 case TPLUS:
3791 if (ctype_isForceRealNumeric (&tr))
3792 {
3793 if (opid == TMINUS)
3794 {
3795 ret->val = multiVal_invert (exprNode_getValue (e));
3796 }
3797 else
3798 {
3799 ret->val = multiVal_copy (exprNode_getValue (e));
3800 }
3801 }
3802 else
3803 {
3804 if (context_msgStrictOps ())
3805 {
3806 voptgenerror
3807 (FLG_STRICTOPS,
3808 message ("Operand of %s is non-numeric (%t): %s",
3809 lltok_unparse (op), te, exprNode_unparse (ret)),
3810 e->loc);
3811 }
3812
3813 ret->typ = ctype_int;
3814 }
3815 break;
3816
3817 case TEXCL: /* maybe this should be restricted */
3818 guardSet_flip (ret->guards);
3819
3820 if (ctype_isRealBool (te))
3821 {
3822 ;
3823 }
3824 else
3825 {
3826 if (ctype_isRealPointer (tr))
3827 {
3828 if (sRef_isKnown (e->sref))
3829 {
3830 ret->guards = guardSet_addFalseGuard (ret->guards, e->sref);
3831 }
3832
3833 voptgenerror2n
3834 (FLG_BOOLOPS, FLG_PTRNEGATE,
3835 message ("Operand of %s is non-boolean (%t): %s",
3836 lltok_unparse (op), te, exprNode_unparse (ret)),
3837 e->loc);
3838 }
3839 else
3840 {
3841 voptgenerror
3842 (FLG_BOOLOPS,
3843 message ("Operand of %s is non-boolean (%t): %s",
3844 lltok_unparse (op), te, exprNode_unparse (ret)),
3845 e->loc);
3846 }
3847
3848 ret->typ = ctype_bool;
3849 }
3850 break;
3851
3852 case TTILDE:
3853 if (ctype_isForceRealInt (&tr))
3854 {
3855 }
3856 else
3857 {
3858 if (context_msgStrictOps ())
3859 {
3860 voptgenerror
3861 (FLG_STRICTOPS,
3862 message ("Operand of %s is non-integer (%t): %s",
3863 lltok_unparse (op), te, exprNode_unparse (ret)),
3864 e->loc);
3865 }
3866
3867 if (ctype_isInt (e->typ))
3868 {
3869 ret->typ = e->typ;
3870 }
3871 else
3872 {
3873 ret->typ = ctype_int;
3874 }
3875 }
3876 break;
3877
3878 case TAMPERSAND:
3879 ret->typ = ctype_makePointer (e->typ);
3880
3881 if (sRef_isKnown (e->sref))
3882 {
3883 ret->sref = sRef_makeAddress (e->sref);
3884 }
3885
3886 break;
3887
3888 case TMULT:
3889
3890 if (ctype_isAP (tr))
3891 {
3892 ret->typ = ctype_baseArrayPtr (e->typ);
3893 }
3894 else
3895 {
3896 if (ctype_isKnown (te))
3897 {
3898 if (ctype_isFunction (te))
3899 {
3900 ret->typ = e->typ;
3901
3902 voptgenerror
3903 (FLG_FCNDEREF,
3904 message ("Dereference of function type (%t): %s",
3905 te, exprNode_unparse (ret)),
3906 e->loc);
3907 }
3908 else
3909 {
3910 voptgenerror (FLG_TYPE,
3911 message ("Dereference of non-pointer (%t): %s",
3912 te, exprNode_unparse (ret)),
3913 e->loc);
3914 ret->typ = ctype_unknown;
3915 }
3916 }
3917 else
3918 {
3919 ret->typ = ctype_unknown;
3920 }
3921
3922 }
3923
3924 if (sRef_isKnown (e->sref))
3925 {
3926 if (sRef_possiblyNull (e->sref))
3927 {
3928 if (!usymtab_isGuarded (e->sref) && !context_inProtectVars ())
3929 {
3930 if (optgenerror
3931 (FLG_NULLDEREF,
3932 message ("Dereference of %s pointer %q: %s",
3933 sRef_nullMessage (e->sref),
3934 sRef_unparse (e->sref),
3935 exprNode_unparse (ret)),
3936 e->loc))
3937 {
3938 sRef_showNullInfo (e->sref);
3939 sRef_setNotNull (e->sref, e->loc); /* suppress future messages */
3940 }
3941 }
3942 }
3943
3944 ret->sref = sRef_makePointer (e->sref);
3945 }
3946 break;
3947
3948 default:
3949 llbug (message ("exprNode_preOp: unhandled op: %s", lltok_unparse (op)));
3950 }
3951
3952 if (checkMod)
3953 {
3954 exprNode_checkModify (e, ret);
3955 }
3956
3957 return ret;
3958}
3959
3960/*
3961** any reason to disallow sizeof (abstract type) ?
3962*/
3963
3964/*
3965** used by both sizeof
3966*/
3967
3968static
3969ctype sizeof_resultType (void)
3970{
3971 static ctype sizet = ctype_unknown;
3972
3973 if (ctype_isUnknown (sizet))
3974 {
3975 if (usymtab_existsType (cstring_makeLiteralTemp ("size_t")))
3976 {
3977 sizet = uentry_getAbstractType (usymtab_lookup (cstring_makeLiteralTemp ("size_t")));
3978 }
3979 else
3980 {
3981 sizet = ctype_ulint;
3982 }
3983 }
3984 return sizet;
3985}
3986
3987exprNode
3988exprNode_sizeofType (/*@only@*/ qtype qt)
3989{
3990 exprNode ret = exprNode_create (sizeof_resultType ());
3991 ctype ct = qtype_getType (qt);
3992
3993 ret->kind = XPR_SIZEOFT;
3994 ret->edata = exprData_makeSizeofType (qt);
3995
3996 voptgenerror (FLG_SIZEOFTYPE,
3997 message ("Parameter to sizeof is type %s: %s",
3998 ctype_unparse (ct),
3999 exprNode_unparse (ret)),
4000 ret->loc);
4001
4002 return (ret);
4003}
4004
4005exprNode
4006exprNode_alignofType (/*@only@*/ qtype qt)
4007{
4008 exprNode ret = exprNode_create (sizeof_resultType ());
4009 ctype ct = qtype_getType (qt);
4010
4011 ret->kind = XPR_ALIGNOFT;
4012 ret->edata = exprData_makeSizeofType (qt);
4013
4014 voptgenerror (FLG_SIZEOFTYPE,
4015 message ("Parameter to alignof is type %s: %s",
4016 ctype_unparse (ct),
4017 exprNode_unparse (ret)),
4018 ret->loc);
4019
4020 return (ret);
4021}
4022
4023exprNode exprNode_offsetof (qtype qt, cstringList s)
4024{
4025 exprNode ret = exprNode_create (sizeof_resultType ());
4026 ctype ct = qtype_getType (qt);
4027
4028 ret->kind = XPR_OFFSETOF;
4029 ret->edata = exprData_makeOffsetof (qt, s);
4030
4031 if (!ctype_isRealSU (ct))
4032 {
4033 voptgenerror (FLG_TYPE,
4034 message ("First parameter to offsetof is not a "
4035 "struct or union type (type %s): %s",
4036 ctype_unparse (ct),
4037 exprNode_unparse (ret)),
4038 ret->loc);
4039 }
4040 else
4041 {
4042 ctype lt = ct;
4043
4044 cstringList_elements (s, el) {
4045 uentryList fields;
4046 uentry fld;
4047
4048 if (ctype_isUndefined (lt))
4049 {
4050 break;
4051 }
4052 else if (!ctype_isRealSU (lt))
4053 {
4054 voptgenerror (FLG_TYPE,
4055 message ("Inner offsetof type is not a "
4056 "struct or union type (type %s before field %s): %s",
4057 ctype_unparse (lt), el,
4058 exprNode_unparse (ret)),
4059 ret->loc);
4060 break;
4061 }
4062 else
4063 {
4064 fields = ctype_getFields (ctype_realType (lt));
4065 fld = uentryList_lookupField (fields, el);
4066 DPRINTF (("Try: %s / %s", ctype_unparse (lt), el));
4067
4068 if (uentry_isUndefined (fld))
4069 {
4070 if (ctype_equal (lt, ct)) {
4071 voptgenerror (FLG_TYPE,
4072 message ("Field %s in offsetof is not the "
4073 "name of a field of %s: %s",
4074 el,
4075 ctype_unparse (ct),
4076 exprNode_unparse (ret)),
4077 ret->loc);
4078 } else {
4079 voptgenerror (FLG_TYPE,
4080 message ("Deep field %s in offsetof is not the "
4081 "name of a field of %s: %s",
4082 el,
4083 ctype_unparse (lt),
4084 exprNode_unparse (ret)),
4085 ret->loc);
4086 }
4087 }
4088 else
4089 {
4090 lt = uentry_getType (fld);
4091 }
4092 }
4093 } end_cstringList_elements;
4094
4095 /* Should report error if its a bit field - behavior is undefined! */
4096 }
4097
4098 return (ret);
4099}
4100
4101/*@only@*/ exprNode
4102exprNode_sizeofExpr (/*@only@*/ exprNode e)
4103{
4104 exprNode ret;
4105
4106 if (exprNode_isUndefined (e))
4107 {
4108 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
4109 ret->edata = exprData_makeSingle (e);
4110 ret->typ = sizeof_resultType ();
4111 ret->kind = XPR_SIZEOF;
4112 }
4113 else
4114 {
4115 uentry u = exprNode_getUentry (e);
4116
4117 ret = exprNode_createPartialCopy (e);
4118 ret->edata = exprData_makeSingle (e);
4119
4120 ret->typ = sizeof_resultType ();
4121 ret->kind = XPR_SIZEOF;
4122
4123 if (uentry_isValid (u)
4124 && uentry_isRefParam (u)
4125 && ctype_isRealArray (uentry_getType (u)))
4126 {
4127 voptgenerror
4128 (FLG_SIZEOFFORMALARRAY,
4129 message ("Parameter to sizeof is an array-type function parameter: %s",
4130 exprNode_unparse (ret)),
4131 ret->loc);
4132 }
4133 }
4134
4135 /*
4136 ** sizeof (x) doesn't "really" use x
4137 */
4138
4139 return (ret);
4140}
4141
4142/*@only@*/ exprNode
4143exprNode_alignofExpr (/*@only@*/ exprNode e)
4144{
4145 exprNode ret;
4146
4147 if (exprNode_isUndefined (e))
4148 {
4149 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
4150 }
4151 else
4152 {
4153 ret = exprNode_createPartialCopy (e);
4154 }
4155
4156 ret->edata = exprData_makeSingle (e);
4157 ret->typ = sizeof_resultType ();
4158 ret->kind = XPR_ALIGNOF;
4159
4160 /*
4161 ** sizeof (x) doesn't "really" use x
4162 */
4163
4164 return (ret);
4165}
4166
4167/*@only@*/ exprNode
4168exprNode_cast (/*@only@*/ lltok tok, /*@only@*/ exprNode e, /*@only@*/ qtype q)
4169{
4170 ctype c;
4171 ctype t;
4172 exprNode ret;
4173
4174 if (exprNode_isError (e))
4175 {
4176 qtype_free (q);
4177 lltok_release (tok);
4178 return exprNode_undefined;
4179 }
4180
4181 checkMacroParen (e);
4182
4183 c = qtype_getType (q);
4184 t = exprNode_getType (e);
4185
4186 ret = exprNode_createPartialCopy (e);
4187
4188 ret->loc = fileloc_update (ret->loc, lltok_getLoc (tok));
4189 ret->typ = c;
4190 ret->kind = XPR_CAST;
4191 ret->edata = exprData_makeCast (tok, e, q);
4192
4193 if (ctype_isRealSU (ctype_getBaseType (sRef_getType (e->sref))))
4194 {
4195 /*
4196 ** This is a bit of a hack to avoid a problem
4197 ** when the code does,
4198 ** (some other struct) x
4199 ** ...
4200 ** x->field
4201 */
4202
4203 ret->sref = sRef_copy (e->sref);
4204 usymtab_addForceMustAlias (ret->sref, e->sref);
4205 sRef_setTypeFull (ret->sref, c);
4206 DPRINTF (("Cast: %s -> %s", sRef_unparseFull (e->sref),
4207 sRef_unparseFull (ret->sref)));
4208 }
4209 else
4210 {
4211 ret->sref = e->sref;
4212 sRef_setTypeFull (ret->sref, c);
4213 DPRINTF (("Cast 2: -> %s", sRef_unparseFull (ret->sref)));
4214 }
4215
4216 /*
4217 ** we allow
4218 ** abstract -> void
4219 ** 0 <-> abstract *
4220 ** void * <-> abstract * (if FLG_ABSTVOIDP)
4221 ** abstract * <-> void * (if FLG_ABSTVOIDP)
4222 */
4223
4224 if (ctype_isVoid (c)) /* cast to void is always okay --- discard value */
4225 {
4226 ;
4227 }
4228 else if (ctype_isRealAP (c)) /* casting to array or pointer */
4229 {
4230 ctype bc = ctype_getBaseType (c);
4231 ctype bt = ctype_getBaseType (t);
4232 ctype rt = ctype_realType (t);
4233
4234 if (ctype_isFunction (ctype_baseArrayPtr (ctype_realType (c)))
4235 && (ctype_isArrayPtr (rt)
4236 && !ctype_isFunction (ctype_realType (ctype_baseArrayPtr (rt)))))
4237 {
4238 voptgenerror
4239 (FLG_CASTFCNPTR,
4240 message ("Cast from function pointer type (%t) to "
4241 "non-function pointer (%t): %s",
4242 c, t, exprNode_unparse (ret)),
4243 e->loc);
4244 }
4245
4246 if (!ctype_isFunction (ctype_baseArrayPtr (c))
4247 && (ctype_isArrayPtr (rt)
4248 && ctype_isFunction (ctype_realType (ctype_baseArrayPtr (rt)))))
4249 {
4250 voptgenerror
4251 (FLG_CASTFCNPTR,
4252 message ("Cast from non-function pointer type (%t) to "
4253 "function pointer (%t): %s",
4254 c, t, exprNode_unparse (ret)),
4255 e->loc);
4256 }
4257
4258 if (exprNode_isZero (e) && context_getFlag (FLG_ZEROPTR) &&
4259 !(ctype_isRealAbstract (bc)
4260 && context_hasAccess (ctype_typeId (bc))))
4261 {
4262 ; /* okay to cast zero */
4263 }
4264 else
4265 {
4266 if (ctype_isRealAbstract (bc)
4267 && !context_hasAccess (ctype_typeId (bc)))
4268 {
4269 if (ctype_isVoidPointer (t) || ctype_isUnknown (t))
4270 {
4271 vnoptgenerror
4272 (FLG_ABSTVOIDP,
4273 message ("Cast to underlying abstract type %t: %s",
4274 c, exprNode_unparse (ret)),
4275 e->loc);
4276 }
4277 else
4278 {
4279 voptgenerror
4280 (FLG_ABSTRACT,
4281 message ("Cast to underlying abstract type %t: %s",
4282 c, exprNode_unparse (ret)),
4283 e->loc);
4284 }
4285 }
4286
4287 if (ctype_isRealAbstract (bt)
4288 && !context_hasAccess (ctype_typeId (bt)))
4289 {
4290 if (ctype_isUnknown (c) || ctype_isVoidPointer (c))
4291 {
4292 vnoptgenerror
4293 (FLG_ABSTVOIDP,
4294 message ("Cast from underlying abstract type %t: %s",
4295 t, exprNode_unparse (ret)),
4296 e->loc);
4297 }
4298 else
4299 {
4300 voptgenerror
4301 (FLG_ABSTRACT,
4302 message ("Cast from underlying abstract type %t: %s",
4303 t, exprNode_unparse (ret)),
4304 e->loc);
4305 }
4306 }
4307 }
4308 }
4309 else
4310 {
4311 ctype bt = ctype_realType (ctype_getBaseType (t));
4312 ctype bc = ctype_realType (ctype_getBaseType (c));
4313
4314 if (ctype_isAbstract (bt) && !context_hasAccess (ctype_typeId (bt)))
4315 {
4316 if (ctype_match (c, t))
4317 {
4318 if (ctype_equal (c, t))
4319 {
4320 voptgenerror
4321 (FLG_TYPE,
4322 message ("Redundant cast involving abstract type %t: %s",
4323 bt, exprNode_unparse (ret)),
4324 e->loc);
4325 }
4326 }
4327 else
4328 {
4329 voptgenerror
4330 (FLG_ABSTRACT,
4331 message ("Cast from abstract type %t: %s",
4332 bt, exprNode_unparse (ret)),
4333 e->loc);
4334 }
4335 }
4336
4337 if (ctype_isAbstract (bc)
4338 && !context_hasAccess (ctype_typeId (bc)))
4339 {
4340 if (ctype_match (c, t))
4341 {
4342 ;
4343 }
4344 else
4345 {
4346 voptgenerror
4347 (FLG_ABSTRACT,
4348 message ("Cast to abstract type %t: %s", bc,
4349 exprNode_unparse (ret)),
4350 e->loc);
4351 }
4352 }
4353 }
4354
4355 if (ctype_isAbstract (c))
4356 {
4357 if (sRef_isExposed (e->sref) || sRef_isOnly (e->sref))
4358 {
4359 /* okay, cast exposed to abstract */
4360 sRef_clearExKindComplete (ret->sref, fileloc_undefined);
4361 }
4362 else
4363 {
4364 if (ctype_isVisiblySharable (t)
4365 && sRef_isExternallyVisible (e->sref)
4366 && !(ctype_isAbstract (t)
4367 && context_hasAccess (ctype_typeId (t))))
4368 {
4369 voptgenerror
4370 (FLG_CASTEXPOSE,
4371 message ("Cast to abstract type from externally visible "
4372 "mutable storage exposes rep of %s: %s",
4373 ctype_unparse (c),
4374 exprNode_unparse (e)),
4375 e->loc);
4376 }
4377 }
4378 }
4379
4380 return (ret);
4381}
4382
4383static bool
4384evaluationOrderUndefined (lltok op)
4385{
4386 int opid = lltok_getTok (op);
4387
4388 return (opid != AND_OP && opid != OR_OP);
4389}
4390
4391static bool checkIntegral (/*@notnull@*/ exprNode e1,
4392 /*@notnull@*/ exprNode e2,
4393 /*@notnull@*/ exprNode ret,
4394 lltok op)
4395{
4396 bool error = FALSE;
4397
4398 ctype te1 = exprNode_getType (e1);
4399 ctype te2 = exprNode_getType (e2);
4400
4401 ctype tr1 = ctype_realishType (te1);
4402 ctype tr2 = ctype_realishType (te2);
4403
4404 if (ctype_isForceRealInt (&tr1) && ctype_isForceRealInt (&tr2))
4405 {
4406 ;
4407 }
4408 else
4409 {
4410 if (context_msgStrictOps ())
4411 {
4412 if (!ctype_isInt (tr1) && !ctype_isInt (tr2))
4413 {
4414 if (ctype_sameName (te1, te2))
4415 {
4416 error = optgenerror
4417 (FLG_STRICTOPS,
4418 message ("Operands of %s are non-integer (%t): %s",
4419 lltok_unparse (op), te1,
4420 exprNode_unparse (ret)),
4421 e1->loc);
4422 }
4423 else
4424 {
4425 error = optgenerror
4426 (FLG_STRICTOPS,
4427 message ("Operands of %s are non-integers (%t, %t): %s",
4428 lltok_unparse (op), te1, te2,
4429 exprNode_unparse (ret)),
4430 e1->loc);
4431 }
4432 }
4433 else if (!ctype_isInt (tr1))
4434 {
4435 error = optgenerror
4436 (FLG_STRICTOPS,
4437 message ("Left operand of %s is non-integer (%t): %s",
4438 lltok_unparse (op), te1, exprNode_unparse (ret)),
4439 e1->loc);
4440 }
4441 else
4442 /* !ctype_isInt (te2) */
4443 {
4444 error = optgenerror
4445 (FLG_STRICTOPS,
4446 message ("Right operand of %s is non-integer (%t): %s",
4447 lltok_unparse (op), te2, exprNode_unparse (ret)),
4448 e2->loc);
4449 }
4450 }
4451 }
4452
4453 return !error;
4454}
4455
4456/*
4457** returns exprNode representing e1 op e2
4458**
4459** uses msg if there are errors
4460** can be used for both assignment ops and regular ops
4461**
4462** modifies e1
4463*/
4464
4465static /*@only@*/ /*@notnull@*/ exprNode
4466exprNode_makeOp (/*@keep@*/ exprNode e1, /*@keep@*/ exprNode e2,
4467 /*@keep@*/ lltok op)
4468{
4469 ctype te1, te2, tr1, tr2, tret;
4470 int opid = lltok_getTok (op);
4471 bool hasError = FALSE;
4472 exprNode ret;
4473
4474 if (exprNode_isError (e1))
4475 {
4476 ret = exprNode_createPartialNVCopy (e2);
4477 }
4478 else
4479 {
4480 ret = exprNode_createPartialNVCopy (e1);
4481 }
4482
4483 ret->val = multiVal_undefined;
4484 ret->kind = XPR_OP;
4485 ret->edata = exprData_makeOp (e1, e2, op);
4486
4487 if (exprNode_isError (e1) || exprNode_isError (e2))
4488 {
4489 if (opid == TLT || opid == TGT || opid == LE_OP || opid == GE_OP
4490 || opid == EQ_OP || opid == NE_OP
4491 || opid == AND_OP || opid == OR_OP)
4492 {
4493 ret->typ = ctype_bool;
4494 }
4495
4496 if (exprNode_isDefined (e1))
4497 {
4498 exprNode_checkUse (ret, e1->sref, e1->loc);
4499 }
4500
4501 if (exprNode_isDefined (e2))
4502 {
4503 exprNode_mergeUSs (ret, e2);
4504 exprNode_checkUse (ret, e2->sref, e2->loc);
4505 }
4506
4507 return ret;
4508 }
4509
4510 tret = ctype_unknown;
4511 te1 = exprNode_getType (e1);
4512 DPRINTF (("te1 = %s / %s", exprNode_unparse (e1), ctype_unparse (te1)));
4513
4514 te2 = exprNode_getType (e2);
4515
4516 tr1 = ctype_realishType (te1);
4517 tr2 = ctype_realishType (te2);
4518
4519 if (opid == OR_OP)
4520 {
4521 ret->guards = guardSet_or (ret->guards, e2->guards);
4522 }
4523 else if (opid == AND_OP)
4524 {
4525 ret->guards = guardSet_and (ret->guards, e2->guards);
4526 }
4527 else
4528 {
4529 /* no guards */
4530 }
4531
4532 if (opid == EQ_OP || opid == NE_OP)
4533 {
4534 exprNode temp1 = e1, temp2 = e2;
4535
4536 /* could do NULL == x */
4537
4538 if (exprNode_isNullValue (e1) || exprNode_isUnknownConstant (e1))
4539 {
4540 temp1 = e2; temp2 = e1;
4541 }
4542
4543 if (exprNode_isNullValue (temp2) || exprNode_isUnknownConstant (temp2))
4544 {
4545 reflectNullTest (temp1, (opid == NE_OP));
4546 guardSet_free (ret->guards);
4547 ret->guards = guardSet_copy (temp1->guards);
4548 }
4549 }
4550
4551 if (opid == TLT || opid == TGT || opid == LE_OP || opid == GE_OP
4552 || opid == EQ_OP || opid == NE_OP || opid == AND_OP || opid == OR_OP)
4553 {
4554 tret = ctype_bool;
4555 }
4556
4557 if (anyAbstract (tr1, tr2) &&
4558 (!((ctype_isRealBool (te1) || ctype_isRealBool (te2)) &&
4559 (opid == AND_OP || opid == OR_OP
4560 || opid == EQ_OP || opid == NE_OP))))
4561 {
4562 abstractOpError (tr1, tr2, op, e1, e2, e1->loc, e2->loc);
4563 }
4564 else if (ctype_isUnknown (te1) || ctype_isUnknown (te2))
4565 {
4566 /* unknown types, no comparisons possible */
4567 }
4568 else
4569 {
4570 switch (opid)
4571 {
4572 case TMULT: /* multiplication and division: */
4573 case TDIV: /* */
4574 case MUL_ASSIGN: /* numeric, numeric -> numeric */
4575 case DIV_ASSIGN: /* */
4576
4577 tret = checkNumerics (tr1, tr2, te1, te2, e1, e2, op);
4578 break;
4579
4580 case TPLUS: /* addition and subtraction: */
4581 case TMINUS: /* pointer, int -> pointer */
4582 case SUB_ASSIGN: /* int, pointer -> pointer */
4583 case ADD_ASSIGN: /* numeric, numeric -> numeric */
4584
4585 tr1 = ctype_fixArrayPtr (tr1);
4586
4587 if ((ctype_isRealPointer (tr1) && !exprNode_isNullValue (e1))
4588 && (!ctype_isRealPointer (tr2) && ctype_isRealInt (tr2)))
4589 {
4590 /* pointer + int */
4591
4592 if (context_msgPointerArith ())
4593 {
4594 voptgenerror
4595 (FLG_POINTERARITH,
4596 message ("Pointer arithmetic (%t, %t): %s",
4597 te1, te2, exprNode_unparse (ret)),
4598 e1->loc);
4599 }
4600
4601 if (sRef_possiblyNull (e1->sref)
4602 && !usymtab_isGuarded (e1->sref))
4603 {
4604 voptgenerror
4605 (FLG_NULLPOINTERARITH,
4606 message ("Pointer arithmetic involving possibly "
4607 "null pointer %s: %s",
4608 exprNode_unparse (e1),
4609 exprNode_unparse (ret)),
4610 e1->loc);
4611 }
4612
4613 ret->sref = sRef_copy (e1->sref);
4614
1ac6313d 4615 /* start modifications */
4616 /* added by Seejo on 4/16/2000 */
4617
4618 /* Arithmetic operations on pointers wil modify the size/len/null terminated
4619 status */
4620 if ((sRef_isPossiblyNullTerminated (e1->sref)) || (sRef_isNullTerminated(e1->sref))) {
4621 //if (sRef_isKnown (e->sref)) {
4622 //ret->sref = sRef_makeAddress (e->sref);
4623 //}
4624
4625 int val = (int) multiVal_forceInt (e2->val);
4626
4627 /* Operator : + or += */
4628 if ((lltok_getTok (op) == TPLUS) || (lltok_getTok(op) == ADD_ASSIGN)) {
4629 if (sRef_getSize(e1->sref) >= val) {/* Incrementing the pointer by
4630 val should not result in a
4631 size < 0 (size = 0 is ok !) */
4632
4633 sRef_setSize (ret->sref, sRef_getSize(e1->sref) - val);
4634
4635 if (sRef_getLen(e1->sref) == val) { /* i.e. the character at posn val is \0 */
4636 sRef_setNotNullTerminatedState(ret->sref);
4637 sRef_resetLen (ret->sref);
4638 } else {
4639 sRef_setNullTerminatedState(ret->sref);
4640 sRef_setLen (ret->sref, sRef_getLen(e1->sref) - val);
4641 }
4642 }
4643 }
4644
4645 /* Operator : - or -= */
4646 if ((lltok_getTok (op) == TMINUS) || (lltok_getTok (op) == SUB_ASSIGN)) {
4647 if (sRef_getSize(e1->sref) >= 0) {
4648 sRef_setSize (ret->sref, sRef_getSize(e1->sref) + val);
4649 sRef_setLen (ret->sref, sRef_getLen(e1->sref) + val);
4650 }
4651 }
4652 }
4653
4654 /* end modifications */
4655
885824d3 4656 sRef_setNullError (ret->sref);
4657
4658 /*
4659 ** Fixed for 2.2c: the alias state of ptr + int is dependent,
4660 ** since is points to storage that should not be deallocated
4661 ** through this pointer.
4662 */
4663
4664 if (sRef_isOnly (ret->sref)
4665 || sRef_isFresh (ret->sref))
4666 {
4667 sRef_setAliasKind (ret->sref, AK_DEPENDENT, exprNode_loc (ret));
4668 }
4669
4670 tret = e1->typ;
4671 }
4672 else if ((!ctype_isRealPointer(tr1) && ctype_isRealInt (tr1))
4673 && (ctype_isRealPointer (tr2) && !exprNode_isNullValue (e2)))
4674 {
4675 if (context_msgPointerArith ())
4676 {
4677 voptgenerror
4678 (FLG_POINTERARITH,
4679 message ("Pointer arithmetic (%t, %t): %s",
4680 te1, te2, exprNode_unparse (ret)),
4681 e1->loc);
4682 }
4683
4684 if (sRef_possiblyNull (e1->sref)
4685 && !usymtab_isGuarded (e1->sref))
4686 {
4687 voptgenerror
4688 (FLG_NULLPOINTERARITH,
4689 message ("Pointer arithmetic involving possibly "
4690 "null pointer %s: %s",
4691 exprNode_unparse (e2),
4692 exprNode_unparse (ret)),
4693 e2->loc);
4694 }
4695
4696 ret->sref = sRef_copy (e2->sref);
4697
1ac6313d 4698 /* start modifications */
4699 /* added by Seejo on 4/16/2000 */
4700
4701 /* Arithmetic operations on pointers wil modify the size/len/null terminated
4702 status */
4703
4704 if ((sRef_isPossiblyNullTerminated (e2->sref)) || (sRef_isNullTerminated(e2->sref))) {
4705 //if (sRef_isKnown (e->sref)) {
4706 //ret->sref = sRef_makeAddress (e->sref);
4707 //}
4708
4709 int val = (int) multiVal_forceInt (e1->val);
4710
4711 /* Operator : + or += */
4712 if ((lltok_getTok (op) == TPLUS) || (lltok_getTok(op) == ADD_ASSIGN)) {
4713 if (sRef_getSize(e2->sref) >= val) {/* Incrementing the pointer by
4714 val should not result in a
4715 size < 0 (size = 0 is ok !) */
4716
4717 sRef_setSize (ret->sref, sRef_getSize(e2->sref) - val);
4718
4719 if (sRef_getLen(e2->sref) == val) { /* i.e. the character at posn val is \0 */
4720 sRef_setNotNullTerminatedState(ret->sref);
4721 sRef_resetLen (ret->sref);
4722 } else {
4723 sRef_setNullTerminatedState(ret->sref);
4724 sRef_setLen (ret->sref, sRef_getLen(e2->sref) - val);
4725 }
4726 }
4727 }
4728
4729 /* Operator : - or -= */
4730 if ((lltok_getTok (op) == TMINUS) || (lltok_getTok (op) == SUB_ASSIGN)) {
4731 if (sRef_getSize(e2->sref) >= 0) {
4732 sRef_setSize (ret->sref, sRef_getSize(e2->sref) + val);
4733 sRef_setLen (ret->sref, sRef_getLen(e2->sref) + val);
4734 }
4735 }
4736 }
4737
4738 /* end modifications */
4739
885824d3 4740 sRef_setNullError (ret->sref);
4741
4742 /*
4743 ** Fixed for 2.2c: the alias state of ptr + int is dependent,
4744 ** since is points to storage that should not be deallocated
4745 ** through this pointer.
4746 */
4747
4748 if (sRef_isOnly (ret->sref)
4749 || sRef_isFresh (ret->sref)) {
4750 sRef_setAliasKind (ret->sref, AK_DEPENDENT, exprNode_loc (ret));
4751 }
4752
4753 tret = e2->typ;
4754 ret->sref = e2->sref;
4755 }
4756 else
4757 {
4758 tret = checkNumerics (tr1, tr2, te1, te2, e1, e2, op);
4759 }
4760
4761 break;
4762
4763 case LEFT_ASSIGN: /* Shifts: should be unsigned values */
4764 case RIGHT_ASSIGN:
4765 case LEFT_OP:
4766 case RIGHT_OP:
4767 case TAMPERSAND: /* bitwise & */
4768 case AND_ASSIGN:
4769 case TCIRC: /* ^ (XOR) */
4770 case TBAR:
4771 case XOR_ASSIGN:
4772 case OR_ASSIGN:
4773 {
4774 bool reported = FALSE;
4775 flagcode code = FLG_BITWISEOPS;
4776
4777 if (opid == LEFT_OP || opid == LEFT_ASSIGN
4778 || opid == RIGHT_OP || opid == RIGHT_ASSIGN) {
4779 code = FLG_SHIFTSIGNED;
4780 }
4781
4782 if (!ctype_isUnsigned (tr1))
4783 {
4784 if (exprNode_isNonNegative (e1)) {
4785 ;
4786 } else {
4787 reported = optgenerror
4788 (code,
4789 message ("Left operand of %s is not unsigned value (%t): %s",
4790 lltok_unparse (op), te1,
4791 exprNode_unparse (ret)),
4792 e1->loc);
4793
4794 if (reported) {
4795 te1 = ctype_uint;
4796 }
4797 }
4798 }
4799 else
4800 {
4801 /* right need not be signed for shifts */
4802 if (code != FLG_SHIFTSIGNED
4803 && !ctype_isUnsigned (tr2))
4804 {
4805 if (!exprNode_isNonNegative (e2)) {
4806 reported = optgenerror
4807 (code,
4808 message ("Right operand of %s is not unsigned value (%t): %s",
4809 lltok_unparse (op), te2,
4810 exprNode_unparse (ret)),
4811 e2->loc);
4812 }
4813 }
4814 }
4815
4816 if (!reported)
4817 {
4818 if (!checkIntegral (e1, e2, ret, op)) {
4819 te1 = ctype_unknown;
4820 }
4821 }
4822
4823 DPRINTF (("Set: %s", ctype_unparse (te1)));
4824
4825 /*
4826 ** tret is the widest type of te1 and te2
4827 */
4828
4829 tret = ctype_widest (te1, te2);
4830 break;
4831 }
4832 case MOD_ASSIGN:
4833 case TPERCENT:
4834 if (checkIntegral (e1, e2, ret, op)) {
4835 tret = te1;
4836 } else {
4837 tret = ctype_unknown;
4838 }
4839 break;
4840 case EQ_OP:
4841 case NE_OP:
4842 case TLT: /* comparisons */
4843 case TGT: /* numeric, numeric -> bool */
4844 if ((ctype_isReal (tr1) && !ctype_isInt (tr1))
4845 || (ctype_isReal (tr2) && !ctype_isInt (tr2)))
4846 {
4847 ctype rtype = tr1;
4848 bool fepsilon = FALSE;
4849
4850 if (!ctype_isReal (rtype) || ctype_isInt (rtype))
4851 {
4852 rtype = tr2;
4853 }
4854
4855 if (opid == TLT || opid == TGT)
4856 {
4857 uentry ue1 = exprNode_getUentry (e1);
4858 uentry ue2 = exprNode_getUentry (e2);
4859
4860 /*
4861 ** FLT_EPSILON, etc. really is a variable, not
4862 ** a constant.
4863 */
4864
4865 if (uentry_isVariable (ue1))
4866 {
4867 cstring uname = uentry_rawName (ue1);
4868
4869 if (cstring_equalLit (uname, "FLT_EPSILON")
4870 || cstring_equalLit (uname, "DBL_EPSILON")
4871 || cstring_equalLit (uname, "LDBL_EPSILON"))
4872 {
4873 fepsilon = TRUE;
4874 }
4875 }
4876
4877 if (uentry_isVariable (ue2))
4878 {
4879 cstring uname = uentry_rawName (ue2);
4880
4881 if (cstring_equalLit (uname, "FLT_EPSILON")
4882 || cstring_equalLit (uname, "DBL_EPSILON")
4883 || cstring_equalLit (uname, "LDBL_EPSILON"))
4884 {
4885 fepsilon = TRUE;
4886 }
4887 }
4888 }
4889
4890 if (fepsilon)
4891 {
4892 ; /* Don't complain. */
4893 }
4894 else
4895 {
4896 voptgenerror
4897 (FLG_REALCOMPARE,
4898 message ("Dangerous comparison involving %s types: %s",
4899 ctype_unparse (rtype),
4900 exprNode_unparse (ret)),
4901 ret->loc);
4902 }
4903 }
4904 /*@fallthrough@*/
4905 case LE_OP:
4906 case GE_OP:
4907
4908 /*
4909 ** Types should match.
4910 */
4911
4912 if (!exprNode_matchTypes (e1, e2))
4913 {
4914 hasError = gentypeerror
4915 (te1, e1, te2, e2,
4916 message ("Operands of %s have incompatible types (%t, %t): %s",
4917 lltok_unparse (op), te1, te2, exprNode_unparse (ret)),
4918 e1->loc);
4919
4920 }
4921
4922 if (hasError
4923 || (ctype_isForceRealNumeric (&tr1)
4924 && ctype_isForceRealNumeric (&tr2)) ||
4925 (ctype_isRealPointer (tr1) && ctype_isRealPointer (tr2)))
4926 {
4927 ; /* okay */
4928 }
4929 else
4930 {
4931 if ((ctype_isRealNumeric (tr1) && ctype_isRealPointer (tr2)) ||
4932 (ctype_isRealPointer (tr1) && ctype_isRealNumeric (tr2)))
4933 {
4934 voptgenerror
4935 (FLG_PTRNUMCOMPARE,
4936 message ("Comparison of pointer and numeric (%t, %t): %s",
4937 te1, te2, exprNode_unparse (ret)),
4938 e1->loc);
4939 }
4940 else
4941 {
4942 (void) checkNumerics (tr1, tr2, te1, te2, e1, e2, op);
4943 }
4944 tret = ctype_bool;
4945 }
4946
4947 /* EQ_OP should NOT be used with booleans (unless one is FALSE) */
4948
4949 if ((opid == EQ_OP || opid == NE_OP) &&
4950 ctype_isDirectBool (tr1) && ctype_isDirectBool (tr2))
4951 {
4952 /*
4953 ** is one a variable?
4954 */
4955
4956 if (uentry_isVariable (exprNode_getUentry (e1))
4957 || uentry_isVariable (exprNode_getUentry (e2)))
4958 {
4959 /*
4960 ** comparisons with FALSE are okay
4961 */
4962
4963 if (exprNode_isFalseConstant (e1)
4964 || exprNode_isFalseConstant (e2))
4965 {
4966 ;
4967 }
4968 else
4969 {
4970 voptgenerror
4971 (FLG_BOOLCOMPARE,
4972 message
4973 ("Use of %q with %s variables (risks inconsistency because "
4974 "of multiple true values): %s",
4975 cstring_makeLiteral ((opid == EQ_OP) ? "==" : "!="),
4976 context_printBoolName (), exprNode_unparse (ret)),
4977 e1->loc);
4978 }
4979 }
4980 }
4981 break;
4982
4983 case AND_OP: /* bool, bool -> bool */
4984 case OR_OP:
4985
4986 if (ctype_isForceRealBool (&tr1) && ctype_isForceRealBool (&tr2))
4987 {
4988 ;
4989 }
4990 else
4991 {
4992 if (context_maybeSet (FLG_BOOLOPS))
4993 {
4994 if (!ctype_isRealBool (te1) && !ctype_isRealBool (te2))
4995 {
4996 if (ctype_sameName (te1, te2))
4997 {
4998 voptgenerror
4999 (FLG_BOOLOPS,
5000 message ("Operands of %s are non-boolean (%t): %s",
5001 lltok_unparse (op), te1,
5002 exprNode_unparse (ret)),
5003 e1->loc);
5004 }
5005 else
5006 {
5007 voptgenerror
5008 (FLG_BOOLOPS,
5009 message
5010 ("Operands of %s are non-booleans (%t, %t): %s",
5011 lltok_unparse (op), te1, te2, exprNode_unparse (ret)),
5012 e1->loc);
5013 }
5014 }
5015 else if (!ctype_isRealBool (te1))
5016 {
5017 voptgenerror
5018 (FLG_BOOLOPS,
5019 message ("Left operand of %s is non-boolean (%t): %s",
5020 lltok_unparse (op), te1, exprNode_unparse (ret)),
5021 e1->loc);
5022 }
5023 else if (!ctype_isRealBool (te2))
5024 {
5025 voptgenerror
5026 (FLG_BOOLOPS,
5027 message ("Right operand of %s is non-boolean (%t): %s",
5028 lltok_unparse (op), te2, exprNode_unparse (ret)),
5029 e2->loc);
5030 }
5031 else
5032 {
5033 ;
5034 }
5035 }
5036 tret = ctype_bool;
5037 }
5038 break;
5039 default: {
5040 llfatalbug
5041 (cstring_makeLiteral
a0a162cd 5042 ("There has been a problem in the parser. This is due to a bug "
5043 "in either lclint, bison or gcc version 2.95 optimizations, "
5044 "but it has not been confirmed. Please try rebuidling LCLint "
5045 "without the -O<n> option."));
885824d3 5046 }
5047 }
5048 }
5049
5050 DPRINTF (("Return type: %s", ctype_unparse (tret)));
5051 ret->typ = tret;
5052
5053 exprNode_checkUse (ret, e1->sref, e1->loc);
5054 exprNode_mergeUSs (ret, e2);
5055 exprNode_checkUse (ret, e2->sref, e2->loc);
5056
5057 return ret;
5058}
5059
5060/*@only@*/ exprNode
5061exprNode_op (/*@only@*/ exprNode e1, /*@keep@*/ exprNode e2,
5062 /*@only@*/ lltok op)
5063{
5064 exprNode ret;
5065
5066 checkMacroParen (e1);
5067 checkMacroParen (e2);
5068
5069 if (evaluationOrderUndefined (op) && context_maybeSet (FLG_EVALORDER))
5070 {
5071 checkExpressionDefined (e1, e2, op);
5072 }
5073
5074 ret = exprNode_makeOp (e1, e2, op);
5075 return (ret);
5076}
5077
5078static
5079void exprNode_checkAssignMod (exprNode e1, exprNode ret)
5080{
5081 /*
5082 ** This is somewhat bogus!
5083 **
5084 ** Assigning to a nested observer in a non-observer datatype
5085 ** should not produce an error.
5086 */
5087
5088 sRef ref = exprNode_getSref (e1);
5089
5090 DPRINTF (("Check assign mod: %s",
5091 sRef_unparseFull (ref)));
5092
5093 if (sRef_isObserver (ref)
5094 || ((sRef_isFileStatic (ref) || sRef_isGlobal (ref))
5095 && ctype_isArray (ctype_realType (sRef_getType (ref)))))
5096 {
5097 sRef base = sRef_getBase (ref);
5098
5099 if (sRef_isValid (base) && sRef_isObserver (base))
5100 {
5101 exprNode_checkModify (e1, ret);
5102 }
5103 else
5104 {
5105 exprNode_checkModifyVal (e1, ret);
5106 }
5107 }
5108 else
5109 {
5110 exprNode_checkModify (e1, ret);
5111 }
5112}
5113
5114exprNode
5115exprNode_assign (/*@only@*/ exprNode e1,
5116 /*@only@*/ exprNode e2, /*@only@*/ lltok op)
5117{
5118 bool isalloc = FALSE;
5119 bool isjustalloc = FALSE;
5120 exprNode ret;
5121
5122 DPRINTF (("%s [%s] <- %s [%s]",
5123 exprNode_unparse (e1),
5124 ctype_unparse (e1->typ),
5125 exprNode_unparse (e2),
5126 ctype_unparse (e2->typ)));
5127
5128 if (lltok_getTok (op) != TASSIGN)
5129 {
5130 ret = exprNode_makeOp (e1, e2, op);
5131 }
5132 else
5133 {
5134 ret = exprNode_createPartialCopy (e1);
5135 ret->kind = XPR_ASSIGN;
5136 ret->edata = exprData_makeOp (e1, e2, op);
5137
5138 if (!exprNode_isError (e2))
5139 {
5140 ret->sets = sRefSet_union (ret->sets, e2->sets);
5141 ret->msets = sRefSet_union (ret->msets, e2->msets);
5142 ret->uses = sRefSet_union (ret->uses, e2->uses);
5143 }
5144 }
5145
5146 checkExpressionDefined (e1, e2, op);
5147
5148 if (exprNode_isError (e1))
5149 {
5150 if (!exprNode_isError (e2))
5151 {
5152 ret->loc = fileloc_update (ret->loc, e2->loc);
5153 }
5154 else
5155 {
5156 ret->loc = fileloc_update (ret->loc, g_currentloc);
5157 }
5158 }
5159
5160 if (!exprNode_isError (e2))
5161 {
5162 checkMacroParen (e2);
5163 }
5164
5165 if (exprNode_isDefined (e1))
5166 {
5167 if (sRef_isMacroParamRef (e1->sref))
5168 {
5169 if (context_inIterDef ())
5170 {
5171 uentry ue = sRef_getUentry (e1->sref);
5172
5173 if (uentry_isYield (ue))
5174 {
5175 ;
5176 }
5177 else
5178 {
5179 if (fileloc_isDefined (e1->loc))
5180 {
5181 voptgenerror
5182 (FLG_MACROPARAMS,
5183 message ("Assignment to non-yield iter parameter: %q",
5184 sRef_unparse (e1->sref)),
5185 e1->loc);
5186 }
5187 else
5188 {
5189 voptgenerror
5190 (FLG_MACROPARAMS,
5191 message ("Assignment to non-yield iter parameter: %q",
5192 sRef_unparse (e1->sref)),
5193 g_currentloc);
5194 }
5195 }
5196 }
5197 else
5198 {
5199 if (fileloc_isDefined (e1->loc))
5200 {
5201 voptgenerror
5202 (FLG_MACROASSIGN,
5203 message ("Assignment to macro parameter: %q",
5204 sRef_unparse (e1->sref)),
5205 e1->loc);
5206 }
5207 else
5208 {
5209 voptgenerror
5210 (FLG_MACROASSIGN,
5211 message ("Assignment to macro parameter: %q",
5212 sRef_unparse (e1->sref)),
5213 g_currentloc);
5214 }
5215 }
5216 }
5217 else
5218 {
5219 exprNode_checkAssignMod (e1, ret);
5220 }
5221
5222 if (exprNode_isDefined (e2))
5223 {
5224 if (lltok_getTok (op) == TASSIGN)
5225 {
5226 ctype te1 = exprNode_getType (e1);
5227 ctype te2 = exprNode_getType (e2);
5228
5229 if (!ctype_forceMatch (te1, te2))
5230 {
5231 if (exprNode_matchLiteral (te1, e2))
5232 {
5233 ;
5234 }
5235 else
5236 {
5237 (void) gentypeerror
5238 (te2, e2, te1, e1,
5239 message ("Assignment of %t to %t: %s %s %s",
5240 te2, te1, exprNode_unparse (e1),
5241 lltok_unparse (op),
5242 exprNode_unparse (e2)),
5243 e1->loc);
5244 }
5245 }
5246 }
5247
5248 exprNode_mergeUSs (ret, e2);
5249 exprNode_checkUse (ret, e2->sref, e2->loc);
5250
5251 doAssign (e1, e2, FALSE);
5252 ret->sref = e1->sref;
5253 }
5254 else
5255 {
5256 if (exprNode_isDefined (e2))
5257 {
5258 exprNode_mergeUSs (ret, e2);
5259 exprNode_checkUse (ret, e2->sref, e2->loc);
5260 }
5261 }
5262
5263 if (sRef_isPointer (e1->sref) && !sRef_isMacroParamRef (e1->sref))
5264 {
5265 exprNode_checkUse (ret, sRef_getBase (e1->sref), e1->loc);
5266 }
5267
5268 isjustalloc = sRef_isJustAllocated (e1->sref);
5269 isalloc = sRef_isAllocated (e1->sref);
5270
5271 if (sRef_isField (e1->sref))
5272 {
5273 sRef root = sRef_getRootBase (sRef_getBase (e1->sref));
5274
5275 if (!sRef_isAllocated (root) && !sRef_isMacroParamRef (root))
5276 {
5277 exprNode_checkUse (ret, root, e1->loc);
5278 }
5279
5280 }
5281
5282 /*
5283 ** be careful! this defines e1->sref.
5284 */
5285
5286 if (!sRef_isMacroParamRef (e1->sref))
5287 {
5288 exprNode_checkSet (ret, e1->sref);
5289 }
5290
5291 if (isjustalloc)
5292 {
5293 sRef_setAllocatedComplete (e1->sref, exprNode_isDefined (e2)
5294 ? e2->loc : e1->loc);
5295 }
5296 else
5297 {
5298 if (isalloc)
5299 {
5300 sRef_setAllocatedShallowComplete (e1->sref, exprNode_loc (e2));
5301 }
5302 }
5303 }
5304
5305 return ret;
5306}
5307
5308exprNode
5309exprNode_cond (/*@keep@*/ exprNode pred, /*@keep@*/ exprNode ifclause,
5310 /*@keep@*/ exprNode elseclause)
5311{
5312 exprNode ret;
5313
5314 if (!exprNode_isError (pred))
5315 {
5316 ret = exprNode_createPartialCopy (pred);
5317 checkMacroParen (pred);
5318 exprNode_checkPred (cstring_makeLiteralTemp ("conditional"), pred);
5319
5320 if (!exprNode_isError (ifclause))
5321 {
5322 checkMacroParen (ifclause); /* update macro counts! */
5323
5324 if (!exprNode_isError (elseclause))
5325 {
5326 checkMacroParen (elseclause);
5327
5328 if (!exprNode_matchTypes (ifclause, elseclause))
5329 {
5330 if (gentypeerror
5331 (exprNode_getType (ifclause),
5332 ifclause,
5333 exprNode_getType (elseclause),
5334 elseclause,
5335 message ("Conditional clauses are not of same type: "
5336 "%s (%t), %s (%t)",
5337 exprNode_unparse (ifclause),
5338 exprNode_getType (ifclause),
5339 exprNode_unparse (elseclause),
5340 exprNode_getType (elseclause)),
5341 ifclause->loc))
5342 {
5343 ret->sref = sRef_undefined;
5344 ret->typ = ctype_unknown;
5345 }
5346 }
5347 else
5348 {
5349 /* for now...should merge the states */
5350 ret->sref = ifclause->sref;
5351 ret->typ = ifclause->typ;
5352
5353 if (exprNode_isNullValue (ifclause))
5354 {
5355 ret->typ = elseclause->typ;
5356 }
5357 }
5358
5359 exprNode_checkUse (ret, pred->sref, pred->loc);
5360 exprNode_checkUse (ifclause, ifclause->sref, ifclause->loc);
5361 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
5362
5363 exprNode_mergeCondUSs (ret, ifclause, elseclause);
5364
5365 }
5366 else
5367 {
5368 ret->typ = ifclause->typ;
5369
5370 exprNode_checkUse (pred, pred->sref, pred->loc);
5371 exprNode_checkUse (ifclause, ifclause->sref, ifclause->loc);
5372
5373 exprNode_mergeCondUSs (ret, ifclause, exprNode_undefined);
5374 }
5375 }
5376 else
5377 {
5378 if (!exprNode_isError (elseclause))
5379 {
5380 ret->typ = elseclause->typ;
5381
5382 exprNode_checkUse (pred, pred->sref, pred->loc);
5383 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
5384
5385 exprNode_mergeCondUSs (ret, exprNode_undefined, elseclause);
5386 }
5387 }
5388 }
5389 else /* pred is error */
5390 {
5391 if (!exprNode_isError (ifclause))
5392 {
5393 ret = exprNode_createSemiCopy (ifclause);
5394
5395 checkMacroParen (ifclause); /* update macro counts! */
5396
5397 if (!exprNode_isError (elseclause))
5398 {
5399 checkMacroParen (elseclause);
5400
5401 ret->typ = ifclause->typ;
5402
5403 if (!ctype_forceMatch (ifclause->typ, elseclause->typ))
5404 {
5405 if (gentypeerror
5406 (exprNode_getType (ifclause),
5407 ifclause,
5408 exprNode_getType (elseclause),
5409 elseclause,
5410 message ("Conditional clauses are not of same type: "
5411 "%s (%t), %s (%t)",
5412 exprNode_unparse (ifclause),
5413 exprNode_getType (ifclause),
5414 exprNode_unparse (elseclause),
5415 exprNode_getType (elseclause)),
5416 ifclause->loc))
5417 {
5418 ret->typ = ctype_unknown;
5419 }
5420 }
5421
5422 exprNode_checkUse (ifclause, ifclause->sref, ifclause->loc);
5423 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
5424
5425 exprNode_mergeCondUSs (ret, ifclause, elseclause);
5426 }
5427 }
5428 else if (!exprNode_isError (elseclause)) /* pred, if errors */
5429 {
5430 ret = exprNode_createSemiCopy (ifclause);
5431
5432 ret->typ = elseclause->typ;
5433 checkMacroParen (elseclause);
5434
5435 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
5436 exprNode_mergeCondUSs (ret, exprNode_undefined, elseclause);
5437 }
5438 else /* all errors! */
5439 {
5440 ret = exprNode_createLoc (ctype_unknown, g_currentloc);
5441 }
5442 }
5443
5444 ret->kind = XPR_COND;
5445 ret->edata = exprData_makeCond (pred, ifclause, elseclause);
5446
5447 if (exprNode_isDefined (ifclause) && exprNode_isDefined (elseclause))
5448 {
5449 exprNode_combineControl (ret, ifclause, elseclause);
5450 }
5451
5452 return (ret);
5453}
5454
5455exprNode
5456exprNode_vaArg (/*@only@*/ lltok tok, /*@only@*/ exprNode arg, /*@only@*/ qtype qt)
5457{
5458 ctype totype = qtype_getType (qt);
5459 exprNode ret =
5460 exprNode_createPartialLocCopy (arg, fileloc_copy (lltok_getLoc (tok)));
5461 ctype targ;
5462
5463 /*
5464 ** check use of va_arg : <valist>, type -> type
5465 */
5466
5467 if (exprNode_isError (arg))
5468 {
5469 }
5470 else
5471 {
5472 targ = exprNode_getType (arg);
5473
5474 /*
5475 ** arg should have be a pointer
5476 */
5477
5478 if (!ctype_isUA (targ) ||
5479 (!usymId_equal (ctype_typeId (targ),
5480 usymtab_getTypeId (cstring_makeLiteralTemp ("va_list")))))
5481 {
5482 voptgenerror
5483 (FLG_TYPE,
5484 message ("First argument to va_arg is not a va_list (type %t): %s",
5485 targ, exprNode_unparse (arg)),
5486 arg->loc);
5487 }
5488
5489 exprNode_checkSet (ret, arg->sref);
5490 }
5491
5492 /*
5493 ** return type is totype
5494 */
5495
5496 ret->typ = totype;
5497 ret->kind = XPR_VAARG;
5498 ret->edata = exprData_makeCast (tok, arg, qt);
5499
5500 return (ret);
5501}
5502
5503exprNode exprNode_labelMarker (/*@only@*/ cstring label)
5504{
5505 exprNode ret = exprNode_createPlain (ctype_undefined);
5506 ret->kind = XPR_LABEL;
5507 ret->edata = exprData_makeLiteral (label);
5508 ret->isJumpPoint = TRUE;
5509
5510 return (ret); /* for now, ignore label */
5511}
5512
5513exprNode exprNode_notReached (/*@returned@*/ exprNode stmt)
5514{
5515 if (exprNode_isDefined (stmt))
5516 {
5517 stmt->isJumpPoint = TRUE;
5518
5519 /* This prevent stray no return path errors, etc. */
5520 stmt->exitCode = XK_MUSTEXIT;
5521 }
5522
5523 return (stmt);
5524}
5525
5526bool exprNode_isDefaultMarker (exprNode e)
5527{
5528 if (exprNode_isDefined (e))
5529 {
5530 return (e->kind == XPR_DEFAULT || e->kind == XPR_FTDEFAULT);
5531 }
5532
5533 return FALSE;
5534}
5535
5536bool exprNode_isCaseMarker (exprNode e)
5537{
5538 if (exprNode_isDefined (e))
5539 {
5540 return (e->kind == XPR_FTCASE || e->kind == XPR_CASE);
5541 }
5542
5543 return FALSE;
5544}
5545
5546bool exprNode_isLabelMarker (exprNode e)
5547{
5548 if (exprNode_isDefined (e))
5549 {
5550 return (e->kind == XPR_LABEL);
5551 }
5552
5553 return FALSE;
5554}
5555
5556exprNode exprNode_caseMarker (/*@only@*/ exprNode test, bool fallThrough)
5557{
5558 exprNode ret = exprNode_createPartialCopy (test);
5559
5560 ret->kind = fallThrough ? XPR_FTCASE : XPR_CASE;
5561
5562 if (exprNode_isError (test)) {
5563 return ret;
5564 }
5565
5566 exprNode_checkUse (ret, test->sref, test->loc);
5567
5568 usymtab_setExitCode (ret->exitCode);
5569
5570 if (ret->mustBreak)
5571 {
5572 usymtab_setMustBreak ();
5573 }
5574
5575 ret->edata = exprData_makeSingle (test);
5576 ret->isJumpPoint = TRUE;
5577
5578 return ret;
5579}
5580
5581# if 0
5582exprNode exprNode_caseStatement (/*@only@*/ exprNode test, /*@only@*/ exprNode stmt, bool fallThrough)
5583{
5584 exprNode ret = exprNode_createPartialCopy (test);
5585
5586 ret->kind = fallThrough ? XPR_FTCASE : XPR_CASE;
5587 ret->edata = exprData_makePair (test, stmt);
5588 ret->isJumpPoint = TRUE;
5589
5590 if (exprNode_isError (test))
5591 {
5592 return ret;
5593 }
5594
5595 exprNode_checkUse (ret, test->sref, test->loc);
5596
5597 if (exprNode_isError (stmt))
5598 {
5599 return ret;
5600 }
5601
5602 exprNode_mergeUSs (ret, stmt);
5603
5604 ret->exitCode = stmt->exitCode;
5605 ret->mustBreak = stmt->mustBreak;
5606 ret->canBreak = stmt->canBreak;
5607
5608 usymtab_setExitCode (ret->exitCode);
5609
5610 if (ret->mustBreak)
5611 {
5612 usymtab_setMustBreak ();
5613 }
5614
5615 return ret;
5616}
5617# endif
5618
5619/*@notnull@*/ /*@only@*/ exprNode
5620exprNode_defaultMarker (/*@only@*/ lltok def, bool fallThrough)
5621{
5622 exprNode ret = exprNode_createTok (def);
5623
5624 ret->isJumpPoint = TRUE;
5625 ret->kind = fallThrough ? XPR_FTDEFAULT : XPR_DEFAULT;
5626 return (ret);
5627}
5628
5629bool
5630exprNode_mayEscape (exprNode e)
5631{
5632 if (exprNode_isDefined (e))
5633 {
5634 return exitkind_couldEscape (e->exitCode);
5635 }
5636 return FALSE;
5637}
5638
5639static bool
5640exprNode_mustBreak (exprNode e)
5641{
5642 if (exprNode_isDefined (e))
5643 {
5644 return e->mustBreak;
5645 }
5646 return FALSE;
5647}
5648
5649bool
5650exprNode_mustEscape (exprNode e)
5651{
5652 if (exprNode_isDefined (e))
5653 {
5654 return exitkind_mustEscape (e->exitCode) || exprNode_mustBreak (e);
5655 }
5656
5657 return FALSE;
5658}
5659
5660bool
5661exprNode_errorEscape (exprNode e)
5662{
5663 if (exprNode_isDefined (e))
5664 {
5665 return exitkind_isError (e->exitCode);
5666 }
5667
5668 return FALSE;
5669}
5670
5671exprNode exprNode_concat (/*@only@*/ exprNode e1, /*@only@*/ exprNode e2)
5672{
5673 exprNode ret = exprNode_createPartialCopy (e1);
5674
5675 ret->edata = exprData_makePair (e1, e2);
5676 ret->kind = XPR_STMTLIST;
5677
5678 if (exprNode_isDefined (e1))
5679 {
5680 ret->isJumpPoint = e1->isJumpPoint;
5681 ret->canBreak = e1->canBreak;
5682 }
5683 else
5684 {
5685 if (exprNode_isDefined (e2))
5686 {
5687 ret->loc = fileloc_update (ret->loc, e2->loc);
5688 }
5689 }
5690
5691 if (exprNode_isDefined (e2))
5692 {
5693 ret->exitCode = e2->exitCode;
5694 ret->mustBreak = e2->mustBreak;
5695 if (e2->canBreak) ret->canBreak = TRUE;
5696 }
5697
5698 /*
5699 ** if e1 must return, then e2 is unreachable!
5700 */
5701
5702 if (exprNode_isDefined (e1) && exprNode_isDefined (e2))
5703 {
5704 if ((exprNode_mustEscape (e1) || exprNode_mustBreak (e1))
5705 && !(e2->isJumpPoint))
5706 {
5707 if (context_getFlag (FLG_UNREACHABLE))
5708 {
5709 exprNode nr = e2;
5710
5711 if (e2->kind == XPR_STMT)
5712 {
4cccc6ad 5713 nr = exprData_getUopNode (e2->edata);
885824d3 5714 }
5715
5716 if ((nr->kind == XPR_TOK
5717 && lltok_isSemi (exprData_getTok (nr->edata))))
5718 {
5719 /* okay to have unreachable ";" */
5720 ret->exitCode = XK_MUSTEXIT;
5721 ret->canBreak = TRUE;
5722 }
5723 else
5724 {
5725 if (optgenerror (FLG_UNREACHABLE,
5726 message ("Unreachable code: %s",
5727 exprNode_unparseFirst (nr)),
5728 exprNode_loc (nr)))
5729 {
5730 ret->isJumpPoint = TRUE;
5731 ret->mustBreak = FALSE;
5732 ret->exitCode = XK_ERROR;
5733 DPRINTF (("Jump point: %s", exprNode_unparse (ret)));
5734 }
5735 else
5736 {
5737 ret->exitCode = XK_MUSTEXIT;
5738 ret->canBreak = TRUE;
5739 }
5740
5741 }
5742 }
5743 }
5744 else
5745 {
5746 if ((e2->kind == XPR_CASE || e2->kind == XPR_DEFAULT))
5747 {
5748 /*
5749 ** We want a warning anytime we have:
5750 ** case xxx: ...
5751 ** yyy; <<<- no break or return
5752 ** case zzz: ...
5753 */
5754
5755 exprNode lastStmt = exprNode_lastStatement (e1);
5756
5757 if (exprNode_isDefined (lastStmt)
5758 && !exprNode_mustEscape (lastStmt)
5759 && !exprNode_mustBreak (lastStmt)
5760 && !exprNode_isCaseMarker (lastStmt)
5761 && !exprNode_isDefaultMarker (lastStmt)
5762 && !exprNode_isLabelMarker (lastStmt))
5763 {
5764 voptgenerror (FLG_CASEBREAK,
5765 cstring_makeLiteral
5766 ("Fall through case (no preceeding break)"),
5767 e2->loc);
5768 }
5769 }
5770 }
5771 }
5772
5773 exprNode_mergeUSs (ret, e2);
a0a162cd 5774 ret = exprNode_mergeEnvironments (ret, e1, e2);
885824d3 5775 usymtab_setExitCode (ret->exitCode);
5776
5777 if (ret->mustBreak)
5778 {
5779 usymtab_setMustBreak ();
5780 }
5781
5782 return ret;
5783}
5784
5785exprNode exprNode_createTok (/*@only@*/ lltok t)
5786{
5787 exprNode ret = exprNode_create (ctype_unknown);
5788 ret->kind = XPR_TOK;
5789 ret->edata = exprData_makeTok (t);
5790 return ret;
5791}
5792
4cccc6ad 5793exprNode exprNode_statement (/*@only@*/ exprNode e, /*@only@*/ lltok t)
885824d3 5794{
5795 if (!exprNode_isError (e))
5796 {
5797 exprNode_checkStatement(e);
5798 }
5799
4cccc6ad 5800 return (exprNode_statementError (e, t));
885824d3 5801}
5802
4cccc6ad 5803static exprNode exprNode_statementError (/*@only@*/ exprNode e, /*@only@*/ lltok t)
885824d3 5804{
5805 exprNode ret = exprNode_createPartialCopy (e);
5806
5807 if (!exprNode_isError (e))
5808 {
5809 if (e->kind != XPR_ASSIGN)
5810 {
5811 exprNode_checkUse (ret, e->sref, e->loc);
5812 }
5813
5814 ret->exitCode = e->exitCode;
5815 ret->canBreak = e->canBreak;
5816 ret->mustBreak = e->mustBreak;
5817 }
5818
4cccc6ad 5819 ret->edata = exprData_makeUop (e, t);
885824d3 5820 ret->kind = XPR_STMT;
5821
5822 return ret;
5823}
5824
5825exprNode exprNode_checkExpr (/*@returned@*/ exprNode e)
5826{
5827 if (!exprNode_isError (e))
5828 {
5829 if (e->kind != XPR_ASSIGN)
5830 {
5831 exprNode_checkUse (e, e->sref, e->loc);
5832 }
5833 }
5834
5835 return e;
5836}
5837
5838void exprNode_produceGuards (exprNode pred)
5839{
5840 if (!exprNode_isError (pred))
5841 {
5842 if (ctype_isRealPointer (pred->typ))
5843 {
5844 pred->guards = guardSet_addTrueGuard (pred->guards, pred->sref);
5845 }
5846
5847 exprNode_checkUse (pred, pred->sref, pred->loc);
5848 exprNode_resetSref (pred);
5849 }
5850}
5851
5852exprNode exprNode_makeBlock (/*@only@*/ exprNode e)
5853{
5854 exprNode ret = exprNode_createPartialCopy (e);
5855
5856 if (!exprNode_isError (e))
5857 {
5858 ret->exitCode = e->exitCode;
5859 ret->canBreak = e->canBreak;
5860 ret->mustBreak = e->mustBreak;
5861 }
5862
5863 ret->edata = exprData_makeSingle (e);
5864 ret->kind = XPR_BLOCK;
5865 return ret;
5866}
5867
5868bool exprNode_isBlock (exprNode e)
5869{
5870 return (exprNode_isDefined (e)
5871 && ((e)->kind == XPR_BLOCK));
5872}
5873
5874bool exprNode_isAssign (exprNode e)
5875{
5876 if (exprNode_isDefined (e))
5877 {
5878 return (e->kind == XPR_ASSIGN);
5879 }
5880
5881 return FALSE;
5882}
5883
5884bool exprNode_isEmptyStatement (exprNode e)
5885{
5886 return (exprNode_isDefined (e)
5887 && (e->kind == XPR_TOK)
5888 && (lltok_isSemi (exprData_getTok (e->edata))));
5889}
5890
5891exprNode exprNode_if (/*@only@*/ exprNode pred, /*@only@*/ exprNode tclause)
5892{
5893 exprNode ret;
5894 bool emptyErr = FALSE;
5895
5896 if (context_maybeSet (FLG_IFEMPTY))
5897 {
5898 if (exprNode_isEmptyStatement (tclause))
5899 {
5900 emptyErr = optgenerror (FLG_IFEMPTY,
5901 cstring_makeLiteral
5902 ("Body of if statement is empty"),
5903 exprNode_loc (tclause));
5904 }
5905 }
5906
5907 if (!emptyErr && context_maybeSet (FLG_IFBLOCK))
5908 {
5909 if (exprNode_isDefined (tclause)
5910 && !exprNode_isBlock (tclause))
5911 {
5912 voptgenerror (FLG_IFBLOCK,
5913 message
5914 ("Body of if statement is not a block: %s",
5915 exprNode_unparse (tclause)),
5916 exprNode_loc (tclause));
5917 }
5918 }
5919
5920 if (exprNode_isError (pred))
5921 {
5922 if (exprNode_isError (tclause))
5923 {
5924 ret = exprNode_createLoc (ctype_unknown, g_currentloc);
5925 }
5926 else
5927 {
5928 ret = exprNode_createPartialCopy (tclause);
5929 }
5930 }
5931 else
5932 {
5933 if (exprNode_mustEscape (pred))
5934 {
5935 voptgenerror
5936 (FLG_UNREACHABLE,
5937 message ("Predicate always exits: %s", exprNode_unparse (pred)),
5938 exprNode_loc (pred));
5939 }
5940
5941 exprNode_checkPred (cstring_makeLiteralTemp ("if"), pred);
5942 exprNode_checkUse (pred, pred->sref, pred->loc);
5943
5944 if (!exprNode_isError (tclause))
5945 {
5946 exprNode_mergeCondUSs (pred, tclause, exprNode_undefined);
5947 }
5948
5949 ret = exprNode_createPartialCopy (pred);
5950 }
5951
5952 ret->kind = XPR_IF;
5953 ret->edata = exprData_makePair (pred, tclause);
5954
5955 ret->exitCode = XK_UNKNOWN;
5956
5957 if (exprNode_isDefined (tclause))
5958 {
5959 ret->exitCode = exitkind_makeConditional (tclause->exitCode);
5960 ret->canBreak = tclause->canBreak;
5961 ret->sets = sRefSet_union (ret->sets, tclause->sets);
5962 ret->msets = sRefSet_union (ret->msets, tclause->msets);
5963 ret->uses = sRefSet_union (ret->uses, tclause->uses);
5964 }
5965
5966 ret->mustBreak = FALSE;
5967
5968 return ret;
5969}
5970
5971exprNode exprNode_ifelse (/*@only@*/ exprNode pred,
5972 /*@only@*/ exprNode tclause,
5973 /*@only@*/ exprNode eclause)
5974{
5975 exprNode ret;
5976 bool tEmptyErr = FALSE;
5977 bool eEmptyErr = FALSE;
5978
5979 if (context_maybeSet (FLG_IFEMPTY))
5980 {
5981 if (exprNode_isEmptyStatement (tclause))
5982 {
5983 tEmptyErr = optgenerror
5984 (FLG_IFEMPTY,
5985 cstring_makeLiteral
5986 ("Body of if clause of if statement is empty"),
5987 exprNode_loc (tclause));
5988 }
5989
5990 if (exprNode_isEmptyStatement (eclause))
5991 {
5992 eEmptyErr = optgenerror
5993 (FLG_IFEMPTY,
5994 cstring_makeLiteral
5995 ("Body of else clause of if statement is empty"),
5996 exprNode_loc (eclause));
5997 }
5998 }
5999
6000 if (context_maybeSet (FLG_IFBLOCK))
6001 {
6002 if (!tEmptyErr
6003 && exprNode_isDefined (tclause)
6004 && !exprNode_isBlock (tclause))
6005 {
6006 voptgenerror (FLG_IFBLOCK,
6007 message
6008 ("Body of if clause of if statement is not a block: %s",
6009 exprNode_unparse (tclause)),
6010 exprNode_loc (tclause));
6011 }
6012
6013 if (!eEmptyErr
6014 && exprNode_isDefined (eclause)
6015 && !exprNode_isBlock (eclause)
6016 && !(eclause->kind == XPR_IF)
6017 && !(eclause->kind == XPR_IFELSE))
6018 {
6019 voptgenerror
6020 (FLG_IFBLOCK,
6021 message
6022 ("Body of else clause of if statement is not a block: %s",
6023 exprNode_unparse (eclause)),
6024 exprNode_loc (eclause));
6025 }
6026 }
6027
6028 if (context_maybeSet (FLG_ELSEIFCOMPLETE))
6029 {
6030 if (exprNode_isDefined (eclause)
6031 && (eclause->kind == XPR_IF))
6032 {
6033 voptgenerror (FLG_ELSEIFCOMPLETE,
6034 message ("Incomplete else if logic (no final else): %s",
6035 exprNode_unparse (eclause)),
6036 exprNode_loc (eclause));
6037 }
6038 }
6039
6040 if (exprNode_isError (pred))
6041 {
6042 if (exprNode_isError (tclause))
6043 {
6044 if (exprNode_isError (eclause))
6045 {
6046 ret = exprNode_createLoc (ctype_unknown, g_currentloc);
6047 }
6048 else
6049 {
6050 ret = exprNode_createPartialCopy (eclause);
6051 }
6052 }
6053 else
6054 {
6055 ret = exprNode_createPartialCopy (tclause);
6056 }
6057 }
6058 else /* pred is okay */
6059 {
6060 ret = exprNode_createPartialCopy (pred);
6061
6062 if (exprNode_mustEscape (pred))
6063 {
6064 voptgenerror
6065 (FLG_UNREACHABLE,
6066 message ("Predicate always exits: %s", exprNode_unparse (pred)),
6067 exprNode_loc (pred));
6068 }
6069
6070 exprNode_checkPred (cstring_makeLiteralTemp ("if"), pred);
6071 exprNode_checkUse (ret, pred->sref, pred->loc);
6072
6073 exprNode_mergeCondUSs (ret, tclause, eclause);
6074 }
6075
6076 ret->kind = XPR_IFELSE;
6077 ret->edata = exprData_makeCond (pred, tclause, eclause);
6078
6079 if (exprNode_isDefined (tclause) && exprNode_isDefined (eclause))
6080 {
6081 exprNode_combineControl (ret, tclause, eclause);
6082 ret->loc = fileloc_update (ret->loc, eclause->loc);
6083 }
6084
6085 return ret;
6086}
6087
6088/*
6089** *allpaths <- TRUE iff all executions paths must go through the switch
6090*/
6091
6092static bool
6093checkSwitchExpr (exprNode test, /*@dependent@*/ exprNode e, /*@out@*/ bool *allpaths)
6094{
6095 exprNodeSList el = exprNode_flatten (e);
6096 bool mustReturn = TRUE; /* find a branch that doesn't */
6097 bool thisReturn = FALSE;
6098 bool hasDefault = FALSE;
6099 bool hasAllMembers = FALSE;
6100 bool inSwitch = FALSE;
6101 bool isEnumSwitch = FALSE;
6102 bool canBreak = FALSE;
6103 bool fallThrough = FALSE;
6104 ctype ct = ctype_unknown;
6105 enumNameSList usedEnums;
6106 enumNameList enums;
6107
6108 if (exprNode_isDefined (test))
6109 {
6110 ctype ttype;
6111
6112 ct = test->typ;
6113 ttype = ctype_realType (ct);
6114
6115 if (ctype_isEnum (ttype))
6116 {
6117 isEnumSwitch = TRUE;
6118 enums = ctype_elist (ttype);
6119 usedEnums = enumNameSList_new ();
6120 }
6121 }
6122
6123 exprNodeSList_elements (el, current)
6124 {
6125 if (exprNode_isDefined (current))
6126 {
6127 switch (current->kind)
6128 {
6129 case XPR_FTDEFAULT:
6130 case XPR_DEFAULT:
6131 if (hasDefault)
6132 {
6133 voptgenerror
6134 (FLG_CONTROL,
6135 message ("Duplicate default cases in switch"),
6136 exprNode_loc (current));
6137 }
6138 /*@fallthrough@*/
6139 case XPR_FTCASE:
6140 case XPR_CASE:
6141 if (current->kind == XPR_DEFAULT || current->kind == XPR_FTDEFAULT)
6142 {
6143 hasDefault = TRUE;
6144 }
6145 else
6146 {
6147 if (isEnumSwitch)
6148 {
6149 exprNode st = exprData_getSingle (current->edata);
6150 uentry ue = exprNode_getUentry (st);
6151
6152 if (uentry_isValid (ue))
6153 {
6154 cstring cname = uentry_rawName (ue);
6155
6156 if (enumNameList_member (/*@-usedef@*/enums/*@=usedef@*/, cname))
6157 {
6158 if (enumNameSList_member
6159 (/*@-usedef@*/usedEnums/*@=usedef@*/, cname))
6160 {
6161 voptgenerror
6162 (FLG_CONTROL,
6163 message ("Duplicate case in switch: %s",
6164 cname),
6165 current->loc);
6166 }
6167 else
6168 {
6169 enumNameSList_addh (usedEnums, cname);
6170 }
6171 }
6172 else
6173 {
6174 voptgenerror
6175 (FLG_TYPE,
6176 message ("Case in switch not %s member: %s",
6177 ctype_unparse (ct), cname),
6178 current->loc);
6179 }
6180 }
6181 }
6182 }
6183
6184 if (inSwitch && !fallThrough)
6185 {
6186 if (!thisReturn || canBreak)
6187 {
6188 mustReturn = FALSE;
6189 }
6190 }
6191
6192 fallThrough = TRUE;
6193 inSwitch = TRUE;
6194 thisReturn = FALSE;
6195 canBreak = FALSE;
6196 /*@switchbreak@*/ break;
6197 default:
6198 thisReturn = thisReturn || exprNode_mustEscape (current);
6199 canBreak = canBreak || current->canBreak;
6200 if (canBreak) fallThrough = FALSE;
6201 }
6202 }
6203 } end_exprNodeSList_elements;
6204
6205 if (inSwitch) /* check the last one! */
6206 {
6207 if (!thisReturn || canBreak)
6208 {
6209 mustReturn = FALSE;
6210 }
6211 }
6212
6213 if (isEnumSwitch)
6214 {
6215 if (!hasDefault
6216 && (enumNameSList_size (/*@-usedef@*/usedEnums/*@=usedef@*/) !=
6217 enumNameList_size (/*@-usedef@*/enums/*@=usedef@*/)))
6218 {
6219 enumNameSList unused = enumNameSList_subtract (enums, usedEnums);
6220
6221 voptgenerror (FLG_MISSCASE,
6222 message ("Missing case%s in switch: %q",
6223 cstring_makeLiteralTemp
6224 ((enumNameSList_size (unused) > 1) ? "s" : ""),
6225 enumNameSList_unparse (unused)),
6226 g_currentloc);
6227
6228 enumNameSList_free (unused);
6229 }
6230 else
6231 {
6232 hasAllMembers = TRUE;
6233 *allpaths = TRUE;
6234 }
6235
6236 enumNameSList_free (usedEnums);
6237 }
6238 else
6239 {
6240 *allpaths = hasDefault;
6241 }
6242
6243 exprNodeSList_free (el);
6244 return ((hasDefault || hasAllMembers) && mustReturn);
6245}
6246
6247exprNode exprNode_switch (/*@only@*/ exprNode e, /*@only@*/ exprNode s)
6248{
6249 exprNode ret = exprNode_createPartialCopy (e);
6250 bool allpaths;
6251
6252 DPRINTF (("Switch: %s", exprNode_unparse (s)));
6253
6254 ret->kind = XPR_SWITCH;
6255 ret->edata = exprData_makePair (e, s);
6256
6257 if (!exprNode_isError (s))
6258 {
6259 exprNode fs = exprNode_firstStatement (s);
6260 ret->loc = fileloc_update (ret->loc, s->loc);
6261
6262 if (exprNode_isUndefined (fs)
6263 || exprNode_isCaseMarker (fs) || exprNode_isLabelMarker (fs)
6264 || exprNode_isDefaultMarker (fs)) {
6265 ;
6266 } else {
6267 voptgenerror (FLG_FIRSTCASE,
6268 message
6269 ("Statement after switch is not a case: %s", exprNode_unparse (fs)),
6270 fs->loc);
6271 }
6272 }
6273
6274 if (!exprNode_isError (e))
6275 {
6276 if (checkSwitchExpr (e, s, &allpaths))
6277 {
6278 ret->exitCode = XK_MUSTRETURN;
6279 }
6280 else
6281 {
6282 ret->exitCode = e->exitCode;
6283 }
6284
6285 ret->canBreak = e->canBreak;
6286 ret->mustBreak = e->mustBreak;
6287 }
6288 /*
6289 ** forgot this!
6290 ** exprNode.c:3883,32: Variable allpaths used before definition
6291 */
6292 else
6293 {
6294 allpaths = FALSE;
6295 }
6296
6297 DPRINTF (("Context exit switch!"));
6298 context_exitSwitch (ret, allpaths);
6299 DPRINTF (("Context exit switch done!"));
6300
6301 return ret;
6302}
6303
6304static void checkInfiniteLoop (/*@notnull@*/ exprNode test,
6305 /*@notnull@*/ exprNode body)
6306{
6307 sRefSet tuses = test->uses;
6308
6309 if (!sRefSet_isEmpty (test->uses))
6310 {
6311 sRefSet sets = sRefSet_newCopy (body->sets);
6312 bool hasError = TRUE;
6313 bool innerState = FALSE;
6314 sRefSet tuncon = sRefSet_undefined;
6315
6316 sets = sRefSet_union (sets, test->sets);
6317 sets = sRefSet_union (sets, body->msets);
6318 sets = sRefSet_union (sets, test->msets);
6319
6320 sRefSet_allElements (tuses, el)
6321 {
6322 if (sRef_isUnconstrained (el))
6323 {
6324 tuncon = sRefSet_insert (tuncon, el);
6325 }
6326 else
6327 {
6328 if (sRefSet_member (sets, el))
6329 {
6330 hasError = FALSE;
6331 break;
6332 }
6333 }
6334
6335 if (sRef_isInternalState (el)
6336 || sRef_isFileStatic (sRef_getRootBase (el)))
6337 {
6338 innerState = TRUE;
6339 }
6340 } end_sRefSet_allElements ;
6341
6342 if (hasError)
6343 {
6344 sRefSet suncon = sRefSet_undefined;
6345 bool sinner = FALSE;
6346
6347 sRefSet_allElements (sets, el)
6348 {
6349 if (sRef_isUnconstrained (el))
6350 {
6351 suncon = sRefSet_insert (suncon, el);
6352 }
6353 else if (sRef_isInternalState (el))
6354 {
6355 sinner = TRUE;
6356 }
6357 else
6358 {
6359 ;
6360 }
6361 } end_sRefSet_allElements ;
6362
6363 if (sinner && innerState)
6364 {
6365 ;
6366 }
6367 else if (sRefSet_isEmpty (tuncon)
6368 && sRefSet_isEmpty (suncon))
6369 {
6370 voptgenerror
6371 (FLG_INFLOOPS,
6372 message
6373 ("Suspected infinite loop. No value used in loop test (%q) "
6374 "is modified by test or loop body.",
6375 sRefSet_unparsePlain (tuses)),
6376 test->loc);
6377 }
6378 else
6379 {
6380 if (sRefSet_isEmpty (tuncon))
6381 {
6382 voptgenerror
6383 (FLG_INFLOOPSUNCON,
6384 message ("Suspected infinite loop. No condition values "
6385 "modified. Modification possible through "
6386 "unconstrained calls: %q",
6387 sRefSet_unparsePlain (suncon)),
6388 test->loc);
6389 }
6390 else
6391 {
6392 voptgenerror
6393 (FLG_INFLOOPSUNCON,
6394 message ("Suspected infinite loop. No condition values "
6395 "modified. Possible undetected dependency through "
6396 "unconstrained calls in loop test: %q",
6397 sRefSet_unparsePlain (tuncon)),
6398 test->loc);
6399 }
6400 }
6401 }
6402
6403 sRefSet_free (sets);
6404 }
6405}
6406
6407exprNode exprNode_while (/*@keep@*/ exprNode t, /*@keep@*/ exprNode b)
6408{
6409 exprNode ret;
6410 bool emptyErr = FALSE;
4cccc6ad 6411 char *s;
d8b37170 6412 // s = exprNode_generateConstraints (t);
4cccc6ad 6413 // printf("pred: %s\n", s);
d8b37170 6414 // s = exprNode_generateConstraints (b);
a0a162cd 6415 //printf ("body: %s\n", s);
6416 //constraintList_print(b->constraints);
885824d3 6417
6418 if (context_maybeSet (FLG_WHILEEMPTY))
6419 {
6420 if (exprNode_isEmptyStatement (b))
6421 {
6422 emptyErr = optgenerror
6423 (FLG_WHILEEMPTY,
6424 cstring_makeLiteral
6425 ("Body of while statement is empty"),
6426 exprNode_loc (b));
6427 }
6428 }
6429
6430 if (!emptyErr && context_maybeSet (FLG_WHILEBLOCK))
6431 {
6432 if (exprNode_isDefined (b)
6433 && !exprNode_isBlock (b))
6434 {
6435 if (context_inIterDef ()
6436 && (b->kind == XPR_STMTLIST
6437 || b->kind == XPR_TOK))
6438 {
6439 ; /* no error */
6440 }
6441 else
6442 {
6443 voptgenerror (FLG_WHILEBLOCK,
6444 message
6445 ("Body of while statement is not a block: %s",
6446 exprNode_unparse (b)),
6447 exprNode_loc (b));
6448 }
6449 }
6450 }
6451
6452 if (exprNode_isError (t))
6453 {
6454 if (exprNode_isError (b))
6455 {
6456 ret = exprNode_createLoc (ctype_unknown, g_currentloc);
6457 }
6458 else
6459 {
6460 ret = exprNode_createPartialCopy (b);
6461 }
6462 }
6463 else
6464 {
6465 exprNode test;
6466
6467 ret = exprNode_createPartialCopy (t);
6468
6469 llassert (t->kind == XPR_WHILEPRED);
6470
6471 test = exprData_getSingle (t->edata);
6472
6473 if (!exprNode_isError (b) && exprNode_isDefined (test))
6474 {
6475 if (context_maybeSet (FLG_INFLOOPS)
6476 || context_maybeSet (FLG_INFLOOPSUNCON))
6477 {
6478 /*
6479 ** check that some variable in the predicate is set by the body
6480 ** if the predicate uses any variables
6481 */
6482
6483 checkInfiniteLoop (test, b);
6484 }
6485
6486 exprNode_mergeUSs (ret, b);
6487
6488 if (exprNode_isDefined (b))
6489 {
6490 ret->exitCode = exitkind_makeConditional (b->exitCode);
6491 }
6492 }
6493 }
6494
6495 ret->edata = exprData_makePair (t, b);
6496 ret->kind = XPR_WHILE;
6497
6498 if (exprNode_isDefined (t) && exprNode_mustEscape (t))
6499 {
6500 voptgenerror
6501 (FLG_CONTROL,
6502 message ("Predicate always exits: %s", exprNode_unparse (t)),
6503 exprNode_loc (t));
6504 }
6505
6506 ret->exitCode = XK_NEVERESCAPE;
6507
6508 /*
6509 ** If loop is infinite, and there is no break inside,
6510 ** exit code is never reach.
6511 */
6512
6513 if (exprNode_knownIntValue (t))
6514 {
6515 if (!exprNode_isZero (t))
6516 {
6517 if (exprNode_isDefined (b))
6518 {
6519 if (!b->canBreak)
6520 {
6521 /* Really, it means never reached. */
6522 ret->exitCode = XK_MUSTEXIT;
6523 }
6524 }
6525 }
6526 }
6527 else
6528 {
6529 ;
6530 }
6531
6532 ret->canBreak = FALSE;
6533 ret->mustBreak = FALSE;
6534
6535 return ret;
6536}
6537
6538/*
6539** do { b } while (t);
6540**
6541** note: body passed as first argument
6542*/
6543
6544exprNode exprNode_doWhile (/*@only@*/ exprNode b, /*@only@*/ exprNode t)
6545{
6546 exprNode ret;
6547
6548 if (exprNode_isError (t))
6549 {
6550 if (exprNode_isError (b))
6551 {
6552 ret = exprNode_createLoc (ctype_unknown, g_currentloc);
6553 }
6554 else
6555 {
6556 ret = exprNode_createPartialCopy (b);
6557
6558 ret->exitCode = exitkind_makeConditional (b->exitCode);
6559 exprNode_checkUse (ret, b->sref, b->loc);
6560 ret->exitCode = b->exitCode;
6561 ret->canBreak = b->canBreak;
6562 ret->mustBreak = b->mustBreak;
6563 }
6564 }
6565 else
6566 {
6567 ret = exprNode_createPartialCopy (t);
6568 exprNode_checkPred (cstring_makeLiteralTemp ("while"), t);
6569
6570 if (!exprNode_isError (b))
6571 {
6572 /*
6573 ** forgot the copy's --- why wasn't this detected??
6574 */
6575
6576 ret->sets = sRefSet_copy (ret->sets, b->sets);
6577 ret->msets = sRefSet_copy (ret->msets, b->msets);
6578 ret->uses = sRefSet_copy (ret->uses, b->uses);
6579
6580 /* left this out --- causes and aliasing bug (infinite loop)
6581 should be detected?? */
6582
6583 exprNode_checkUse (ret, b->sref, b->loc);
6584 exprNode_mergeUSs (ret, t);
6585 exprNode_checkUse (ret, t->sref, t->loc);
6586
6587 ret->exitCode = b->exitCode;
6588 ret->canBreak = b->canBreak;
6589 ret->mustBreak = b->mustBreak;
6590 }
6591 }
6592
6593 context_exitDoWhileClause (t);
6594
6595 ret->kind = XPR_DOWHILE;
6596 ret->edata = exprData_makePair (t, b);
6597 return ret;
6598}
6599
6600exprNode exprNode_for (/*@keep@*/ exprNode inc, /*@keep@*/ exprNode body)
6601{
6602 exprNode ret;
6603 bool emptyErr = FALSE;
6604
6605 if (context_maybeSet (FLG_FOREMPTY))
6606 {
6607 if (exprNode_isEmptyStatement (body))
6608 {
6609 emptyErr = optgenerror
6610 (FLG_FOREMPTY,
6611 cstring_makeLiteral
6612 ("Body of for statement is empty"),
6613 exprNode_loc (body));
6614 }
6615 }
6616
6617 if (!emptyErr && context_maybeSet (FLG_FORBLOCK))
6618 {
6619 if (exprNode_isDefined (body)
6620 && !exprNode_isBlock (body))
6621 {
6622 if (context_inIterDef ()
6623 && (body->kind == XPR_STMTLIST
6624 || body->kind == XPR_TOK))
6625 {
6626 ; /* no error */
6627 }
6628 else
6629 {
6630 voptgenerror (FLG_FORBLOCK,
6631 message
6632 ("Body of for statement is not a block: %s",
6633 exprNode_unparse (body)),
6634 exprNode_loc (body));
6635 }
6636 }
6637 }
6638
6639 /*
6640 ** for ud purposes: (alreadly) init -> test -> (now) LOOP: body + inc + test
6641 */
6642
6643 if (exprNode_isError (body))
6644 {
6645 ret = exprNode_createPartialCopy (inc);
6646 }
6647 else
6648 {
6649 ret = exprNode_createPartialCopy (body);
6650
6651 ret->exitCode = exitkind_makeConditional (body->exitCode);
6652
6653 exprNode_mergeUSs (inc, body);
6654
6655 if (exprNode_isDefined (inc))
6656 {
6657 exprNode tmp;
6658
6659 context_setMessageAnnote (cstring_makeLiteral ("in post loop increment"));
6660
6661
6662 tmp = exprNode_effect (exprData_getTripleInc (inc->edata));
6663 exprNode_freeShallow (tmp);
6664
6665 context_clearMessageAnnote ();
6666 context_setMessageAnnote (cstring_makeLiteral ("in post loop test"));
6667
6668 tmp = exprNode_effect (exprData_getTripleTest (inc->edata));
6669 exprNode_freeShallow (tmp);
6670
6671 context_clearMessageAnnote ();
6672
6673 ret->uses = sRefSet_copy (ret->uses, inc->uses);
6674 ret->sets = sRefSet_copy (ret->sets, inc->sets);
6675 ret->msets = sRefSet_copy (ret->msets, inc->msets);
6676 }
6677 }
6678
6679 ret->kind = XPR_FOR;
6680 ret->edata = exprData_makePair (inc, body);
6681
6682 if (exprNode_isDefined (inc)) {
6683 exprNode test = exprData_getTripleTest (inc->edata);
6684
6685 if (exprNode_isUndefined (test)) {
6686 if (exprNode_isDefined (body)) {
6687 if (!body->canBreak) {
6688 /* Really, it means never reached. */
6689 ret->exitCode = XK_MUSTEXIT;
6690 }
6691 }
6692 }
6693 }
6694
6695 return (ret);
6696}
6697
6698/*
6699** for (init; test; inc)
6700** ==>
6701** init;
6702** while (test) { body; inc; }
6703**
6704** Now: check use of init (may set vars for test)
6705** check use of test
6706** no checks on inc
6707_*/
6708
6709/*@observer@*/ guardSet exprNode_getForGuards (exprNode pred)
6710{
6711 exprNode test;
6712
6713 if (exprNode_isError (pred)) return guardSet_undefined;
6714
6715 llassert (pred->kind == XPR_FORPRED);
6716
6717 test = exprData_getTripleTest (pred->edata);
6718
6719 if (!exprNode_isError (test))
6720 {
6721 return (test->guards);
6722 }
6723
6724 return guardSet_undefined;
6725}
6726
6727exprNode exprNode_whilePred (/*@only@*/ exprNode test)
6728{
6729 exprNode ret = exprNode_createSemiCopy (test);
6730
6731 if (exprNode_isDefined (test))
6732 {
6733 exprNode_copySets (ret, test);
6734 exprNode_checkPred (cstring_makeLiteralTemp ("while"), test);
6735 exprNode_checkUse (ret, test->sref, test->loc);
6736
6737 exprNode_produceGuards (test);
6738
6739 ret->guards = guardSet_copy (test->guards);
6740 }
6741
6742 ret->edata = exprData_makeSingle (test);
6743 ret->kind = XPR_WHILEPRED;
6744 return ret;
6745}
6746
6747exprNode exprNode_forPred (/*@only@*/ exprNode init, /*@only@*/ exprNode test,
6748 /*@only@*/ exprNode inc)
6749{
6750 exprNode ret;
6751
6752 /*
6753 ** for ud purposes: init -> test -> LOOP: [ body, inc ]
6754 */
6755
6756 exprNode_checkPred (cstring_makeLiteralTemp ("for"), test);
6757
6758 if (!exprNode_isError (inc))
6759 {
6760 ret = exprNode_createPartialCopy (inc);
6761 }
6762 else
6763 {
6764 if (!exprNode_isError (init))
6765 {
6766 ret = exprNode_createPartialCopy (init);
6767 }
6768 else if (!exprNode_isError (test))
6769 {
6770 ret = exprNode_createPartialCopy (test);
6771 }
6772 else
6773 {
6774 ret = exprNode_createUnknown ();
6775 }
6776 }
6777
6778 exprNode_mergeUSs (ret, init);
6779
6780 if (exprNode_isDefined (init))
6781 {
6782 exprNode_checkUse (ret, init->sref, init->loc);
6783 }
6784
6785 exprNode_mergeUSs (ret, test);
6786
6787 if (exprNode_isDefined (test))
6788 {
6789 exprNode_checkUse (ret, test->sref, test->loc);
6790 }
6791
6792 ret->kind = XPR_FORPRED;
6793 ret->edata = exprData_makeFor (init, test, inc);
6794 return (ret);
6795}
6796
6797/*@notnull@*/ /*@only@*/ exprNode exprNode_goto (/*@only@*/ cstring label)
6798{
6799 exprNode ret = exprNode_createUnknown ();
6800
6801 if (context_inMacro ())
6802 {
6803 voptgenerror (FLG_MACROSTMT,
6804 message ("Macro %s uses goto (not functional)",
6805 context_inFunctionName ()),
6806 g_currentloc);
6807 }
6808
6809 ret->kind = XPR_GOTO;
6810 ret->edata = exprData_makeLiteral (label);
6811 ret->mustBreak = TRUE;
6812 ret->exitCode = XK_GOTO;
6813 ret->canBreak = TRUE;
6814 return ret;
6815}
6816
6817exprNode exprNode_continue (/*@only@*/ lltok l, int qcontinue)
6818{
6819 exprNode ret = exprNode_createLoc (ctype_unknown, fileloc_copy (lltok_getLoc (l)));
6820
6821 ret->kind = XPR_CONTINUE;
6822 ret->edata = exprData_makeTok (l);
6823 ret->canBreak = TRUE;
6824 ret->mustBreak = TRUE;
6825
6826 if (qcontinue == QSAFEBREAK)
6827 {
6828 ; /* no checking */
6829 }
6830 else if (qcontinue == QINNERCONTINUE)
6831 {
6832 if (!context_inDeepLoop ())
6833 {
6834 voptgenerror
6835 (FLG_LOOPLOOPCONTINUE,
6836 cstring_makeLiteral ("Continue statement marked with innercontinue "
6837 "is not inside a nested loop"),
6838 exprNode_loc (ret));
6839 }
6840 }
6841 else if (qcontinue == BADTOK)
6842 {
6843 if (context_inDeepLoop ())
6844 {
6845 voptgenerror
6846 (FLG_LOOPLOOPCONTINUE,
6847 cstring_makeLiteral ("Continue statement in nested loop"),
6848 exprNode_loc (ret));
6849 }
6850 }
6851 else
6852 {
6853 llbuglit ("exprNode_continue: bad qcontinue");
6854 }
6855
6856 return ret;
6857}
6858
6859exprNode exprNode_break (/*@only@*/ lltok l, int bqual)
6860{
6861 exprNode ret = exprNode_createLoc (ctype_unknown, fileloc_copy (lltok_getLoc (l)));
6862 clause breakClause = context_breakClause ();
6863
6864 ret->kind = XPR_BREAK;
6865 ret->edata = exprData_makeTok (l);
6866 ret->canBreak = TRUE;
6867 ret->mustBreak = TRUE;
6868
6869 if (breakClause == NOCLAUSE)
6870 {
6871 voptgenerror
6872 (FLG_SYNTAX,
6873 cstring_makeLiteral ("Break not inside while, for or switch statement"),
6874 exprNode_loc (ret));
6875 }
6876 else
6877 {
6878 if (bqual != BADTOK)
6879 {
6880 switch (bqual)
6881 {
6882 case QSAFEBREAK:
6883 break;
6884 case QINNERBREAK:
6885 if (breakClause == SWITCHCLAUSE)
6886 {
6887 if (!context_inDeepSwitch ())
6888 {
6889 voptgenerror (FLG_SYNTAX,
6890 cstring_makeLiteral
6891 ("Break preceded by innerbreak is not in a deep switch"),
6892 exprNode_loc (ret));
6893 }
6894 }
6895 else
6896 {
6897 if (!context_inDeepLoop ())
6898 {
6899 voptgenerror (FLG_SYNTAX,
6900 cstring_makeLiteral
6901 ("Break preceded by innerbreak is not in a deep loop"),
6902 exprNode_loc (ret));
6903 }
6904 }
6905 break;
6906 case QLOOPBREAK:
6907 if (breakClause == SWITCHCLAUSE)
6908 {
6909 voptgenerror (FLG_SYNTAX,
6910 cstring_makeLiteral
6911 ("Break preceded by loopbreak is breaking a switch"),
6912 exprNode_loc (ret));
6913 }
6914 break;
6915 case QSWITCHBREAK:
6916 if (breakClause != SWITCHCLAUSE)
6917 {
6918 voptgenerror
6919 (FLG_SYNTAX,
6920 message ("Break preceded by switchbreak is breaking %s",
6921 cstring_makeLiteralTemp
6922 ((breakClause == WHILECLAUSE
6923 || breakClause == DOWHILECLAUSE) ? "a while loop"
6924 : (breakClause == FORCLAUSE) ? "a for loop"
6925 : (breakClause == ITERCLAUSE) ? "an iterator"
6926 : "<error loop>")),
6927 exprNode_loc (ret));
6928 }
6929 break;
6930 BADDEFAULT;
6931 }
6932 }
6933 else
6934 {
6935 if (breakClause == SWITCHCLAUSE)
6936 {
6937 clause nextBreakClause = context_nextBreakClause ();
6938
6939 switch (nextBreakClause)
6940 {
6941 case NOCLAUSE: break;
6942 case WHILECLAUSE:
6943 case DOWHILECLAUSE:
6944 case FORCLAUSE:
6945 case ITERCLAUSE:
6946 voptgenerror
6947 (FLG_LOOPSWITCHBREAK,
6948 cstring_makeLiteral ("Break statement in switch inside loop"),
6949 exprNode_loc (ret));
6950 break;
6951 case SWITCHCLAUSE:
6952 voptgenerror
6953 (FLG_SWITCHSWITCHBREAK,
6954 cstring_makeLiteral ("Break statement in switch inside switch"),
6955 exprNode_loc (ret));
6956 break;
6957 BADDEFAULT;
6958 }
6959 }
6960 else
6961 {
6962 if (context_inDeepLoop ())
6963 {
6964 voptgenerror
6965 (FLG_LOOPLOOPBREAK,
6966 cstring_makeLiteral ("Break statement in nested loop"),
6967 exprNode_loc (ret));
6968 }
6969 else
6970 {
6971 if (context_inDeepLoopSwitch ())
6972 {
6973 voptgenerror
6974 (FLG_SWITCHLOOPBREAK,
6975 cstring_makeLiteral ("Break statement in loop inside switch"),
6976 exprNode_loc (ret));
6977 }
6978 }
6979 }
6980 }
6981 }
6982
6983 return ret;
6984}
6985
6986exprNode exprNode_nullReturn (/*@only@*/ lltok t)
6987{
6988 fileloc loc = lltok_getLoc (t);
6989 exprNode ret = exprNode_createLoc (ctype_unknown, fileloc_copy (loc));
6990
6991 context_returnFunction ();
6992 exprChecks_checkNullReturn (loc);
6993
6994 ret->kind = XPR_NULLRETURN;
6995 ret->edata = exprData_makeTok (t);
6996 ret->exitCode = XK_MUSTRETURN;
6997 return ret;
6998}
6999
7000exprNode exprNode_return (/*@only@*/ exprNode e)
7001{
7002 exprNode ret;
7003
7004 if (exprNode_isError (e))
7005 {
7006 ret = exprNode_createUnknown ();
7007 }
7008 else
7009 {
7010 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (e->loc));
7011
7012 exprNode_checkUse (ret, e->sref, e->loc);
7013 exprNode_checkReturn (e);
7014 }
7015
7016 context_returnFunction ();
7017 ret->kind = XPR_RETURN;
7018 ret->edata = exprData_makeSingle (e);
7019 ret->exitCode = XK_MUSTRETURN;
7020
7021 return (ret);
7022}
7023
7024exprNode exprNode_comma (/*@only@*/ exprNode e1, /*@only@*/ exprNode e2)
7025{
7026 exprNode ret;
7027
7028 if (exprNode_isError (e1))
7029 {
7030 if (exprNode_isError (e2))
7031 {
7032 ret = exprNode_createLoc (ctype_unknown, g_currentloc);
7033 }
7034 else
7035 {
7036 ret = exprNode_createPartialCopy (e2);
7037 exprNode_checkUse (ret, e2->sref, e2->loc);
7038 ret->sref = e2->sref;
7039 }
7040 }
7041 else
7042 {
7043 ret = exprNode_createPartialCopy (e1);
7044
7045 exprNode_checkUse (ret, e1->sref, e1->loc);
7046
7047 if (!exprNode_isError (e2))
7048 {
7049 exprNode_mergeUSs (ret, e2);
7050 exprNode_checkUse (ret, e2->sref, e2->loc);
7051 ret->sref = e2->sref;
7052 }
7053 }
7054
7055 ret->kind = XPR_COMMA;
7056 ret->edata = exprData_makePair (e1, e2);
7057
7058 if (exprNode_isDefined (e1))
7059 {
7060 if (exprNode_isDefined (e2))
7061 {
7062 ret->typ = e2->typ;
7063
7064 if (exprNode_mustEscape (e1) || e1->mustBreak)
7065 {
7066 voptgenerror
7067 (FLG_UNREACHABLE,
7068 message ("Second clause of comma expression is unreachable: %s",
7069 exprNode_unparse (e2)),
7070 exprNode_loc (e2));
7071 }
7072
7073 ret->exitCode = exitkind_combine (e1->exitCode, e2->exitCode);
7074 ret->mustBreak = e1->mustBreak || e2->mustBreak;
7075 ret->canBreak = e1->canBreak || e2->canBreak;
7076 }
7077 else
7078 {
7079 if (exprNode_mustEscape (e1) || e1->mustBreak)
7080 {
7081 voptgenerror
7082 (FLG_UNREACHABLE,
7083 message ("Second clause of comma expression is unreachable: %s",
7084 exprNode_unparse (e2)),
7085 exprNode_loc (e2));
7086 }
7087
7088 ret->exitCode = e1->exitCode;
7089 ret->canBreak = e1->canBreak;
7090 }
7091 }
7092 else
7093 {
7094 if (exprNode_isDefined (e2))
7095 {
7096 ret->exitCode = e2->exitCode;
7097 ret->mustBreak = e2->mustBreak;
7098 ret->canBreak = e2->canBreak;
7099 }
7100 }
7101
7102 return (ret);
7103}
7104
7105static bool exprNode_checkOneInit (/*@notnull@*/ exprNode el, exprNode val)
7106{
7107 ctype t1 = exprNode_getType (el);
7108 ctype t2 = exprNode_getType (val);
7109 bool hasError = FALSE;
7110
7111 if (ctype_isUnknown (t1))
7112 {
7113 voptgenerror (FLG_IMPTYPE,
7114 message ("Variable has unknown (implicitly int) type: %s",
7115 exprNode_unparse (el)),
7116 el->loc);
7117
7118 t1 = ctype_int;
7119 el->typ = ctype_int;
7120 }
7121
7122 if (exprNode_isDefined (val) && val->kind == XPR_INITBLOCK)
7123 {
7124 exprNodeList vals = exprData_getArgs (val->edata);
7125
7126 if (ctype_isRealAP (t1))
7127 {
7128 int i = 0;
7129 int nerrors = 0;
7130
7131 exprNodeList_elements (vals, oneval)
7132 {
7133 cstring istring = message ("%d", i);
7134 exprNode newel =
7135 exprNode_arrayFetch
7136 (exprNode_fakeCopy (el),
7137 exprNode_numLiteral (ctype_int, istring,
7138 fileloc_copy (el->loc), i));
7139
7140 if (exprNode_isDefined (newel))
7141 {
7142 if (exprNodeList_size (vals) == 1
7143 && ctype_isString (exprNode_getType (oneval))
7144 && ctype_isChar (exprNode_getType (newel)))
7145 {
7146 exprNode_freeIniter (newel);
7147 }
7148 else
7149 {
7150 if (exprNode_checkOneInit (newel, oneval))
7151 {
7152 hasError = TRUE;
7153 nerrors++;
7154
7155 if (nerrors > 3 && exprNodeList_size (vals) > 6)
7156 {
7157 llgenmsg
7158 (message ("Additional initialization errors "
7159 "for %s not reported",
7160 exprNode_unparse (el)),
7161 exprNode_loc (el));
7162 exprNode_freeIniter (newel);
7163 break;
7164 }
7165 else
7166 {
7167 exprNode_freeIniter (newel);
7168 }
7169 }
7170 else
7171 {
7172 exprNode_freeIniter (newel);
7173 }
7174 }
7175 }
7176
7177 cstring_free (istring);
7178 i++;
7179 /*@-branchstate@*/
7180 } end_exprNodeList_elements;
7181 /*@=branchstate@*/
7182 }
7183 else if (ctype_isStruct (ctype_realType (t1)))
7184 {
7185 uentryList fields = ctype_getFields (t1);
7186 int i = 0;
7187
7188 if (uentryList_size (fields) != exprNodeList_size (vals))
7189 {
7190 if (uentryList_size (fields) > exprNodeList_size (vals))
7191 {
7192 hasError = optgenerror
7193 (FLG_FULLINITBLOCK,
7194 message ("Initializer block for "
7195 "%s has %d field%p, but %s has %d field%p: %q",
7196 exprNode_unparse (el),
7197 exprNodeList_size (vals),
7198 ctype_unparse (t1),
7199 uentryList_size (fields),
7200 exprNodeList_unparse (vals)),
7201 val->loc);
7202 }
7203 else
7204 {
7205 hasError = optgenerror
7206 (FLG_TYPE,
7207 message ("Initializer block for "
7208 "%s has %d field%p, but %s has %d field%p: %q",
7209 exprNode_unparse (el),
7210 exprNodeList_size (vals),
7211 ctype_unparse (t1),
7212 uentryList_size (fields),
7213 exprNodeList_unparse (vals)),
7214 val->loc);
7215 }
7216 }
7217 else
7218 {
7219 exprNodeList_elements (vals, oneval)
7220 {
7221 uentry thisfield = uentryList_getN (fields, i);
7222 exprNode newel =
7223 exprNode_fieldAccess (exprNode_fakeCopy (el),
7224 uentry_getName (thisfield));
7225
7226 if (exprNode_isDefined (newel))
7227 {
7228 if (exprNode_checkOneInit (newel, oneval))
7229 {
7230 hasError = TRUE;
7231 }
7232
7233 exprNode_freeIniter (newel);
7234 }
7235
7236 i++;
7237 } end_exprNodeList_elements;
7238 }
7239 }
7240 else
7241 {
7242 hasError = optgenerror
7243 (FLG_TYPE,
7244 message ("Initializer block used for "
7245 "%s where %t is expected: %s",
7246 exprNode_unparse (el), t1, exprNode_unparse (val)),
7247 val->loc);
7248 }
7249 }
7250 else
7251 {
7252 if (exprNode_isDefined (val))
7253 {
7254 doAssign (el, val, TRUE);
7255
7256 if (!exprNode_matchType (t1, val))
7257 {
7258 hasError = gentypeerror
7259 (t1, val, t2, el,
7260 message ("Initial value of %s is type %t, "
7261 "expects %t: %s",
7262 exprNode_unparse (el),
7263 t2, t1, exprNode_unparse (val)),
7264 val->loc);
7265 }
7266 }
7267 }
7268
7269 return hasError;
7270}
7271
7272exprNode exprNode_makeInitialization (/*@only@*/ idDecl t,
7273 /*@only@*/ exprNode e)
7274{
7275 uentry ue = usymtab_lookup (idDecl_observeId (t));
7276 bool isUsed = uentry_isUsed (ue);
7277 exprNode ret = exprNode_fromIdentifierAux (ue);
7278 ctype ct = ctype_realishType (ret->typ);
7279 fileloc loc;
7280
7281 if (ctype_isUnknown (ct))
7282 {
7283 voptgenerror (FLG_IMPTYPE,
7284 message ("Variable has unknown (implicitly int) type: %s",
7285 idDecl_getName (t)),
7286 exprNode_isDefined (e) ? exprNode_loc (e) : g_currentloc);
7287
7288 ct = ctype_int;
7289 }
7290
7291 if (exprNode_isError (e))
7292 {
7293 e = exprNode_createUnknown ();
7294 loc = g_currentloc;
7295
7296 /* error: assume initializer is defined */
7297 sRef_setDefined (ret->sref, loc);
7298 }
7299 else
7300 {
7301 loc = exprNode_loc (e);
7302
7303 /*
7304 ** evs - 9 Apr 1995
7305 **
7306 ** was addSafeUse --- what's the problem?
7307 **
7308 ** int x = 3, y = x ?
7309 */
7310
7311 exprNode_checkUse (ret, e->sref, e->loc);
7312
7313 if (ctype_isUnknown (e->typ) && uentry_isValid (ue))
7314 {
7315 exprNode lhs = exprNode_createId (ue);
7316
7317 /*
7318 ** static storage should be undefined before initializing
7319 */
7320
7321 if (uentry_isStatic (ue))
7322 {
7323 sRef_setDefState (lhs->sref, SS_PARTIAL, fileloc_undefined);
7324 }
7325
7326 (void) exprNode_checkOneInit (lhs, e);
7327
7328 if (uentry_isStatic (ue))
7329 {
7330 sRef_setDefState (lhs->sref, SS_DEFINED, fileloc_undefined);
7331 }
7332
7333 exprNode_free (lhs);
7334 }
7335 else
7336 {
7337 if (!exprNode_matchType (ct, e))
7338 {
7339 if (exprNode_isZero (e) && ctype_isArrayPtr (ct))
7340 {
7341 ;
7342 }
7343 else
7344 {
7345 (void) gentypeerror
7346 (exprNode_getType (e), e, exprNode_getType (ret), ret,
7347 message
7348 ("Variable %s initialized to type %t, expects %t: %s",
7349 exprNode_unparse (ret), exprNode_getType (e),
7350 exprNode_getType (ret),
7351 exprNode_unparse (e)),
7352 e->loc);
7353 }
7354 }
7355 }
7356
7357 if (uentry_isStatic (ue))
7358 {
7359 sRef_setDefState (ret->sref, SS_PARTIAL, fileloc_undefined);
7360 }
7361
7362 doAssign (ret, e, TRUE);
7363
7364 if (uentry_isStatic (ue))
7365 {
7366 sRef_setDefState (ret->sref, SS_DEFINED, fileloc_undefined);
7367 }
7368 }
7369
7370 if (context_inIterDef ())
7371 {
7372 /* should check if it is yield */
7373 uentry_setUsed (ue, loc);
7374 }
7375 else
7376 {
7377 if (!isUsed) /* could be @unused@-qualified variable */
7378 {
7379 uentry_setNotUsed (ue);
7380 }
7381 }
7382
7383 ret->exitCode = XK_NEVERESCAPE;
7384 ret->mustBreak = FALSE;
7385
7386 /*
7387 ** Must be before new kind is assigned!
7388 */
7389
7390 exprData_free (ret->edata, ret->kind);
7391
7392 ret->kind = XPR_INIT;
7393 ret->edata = exprData_makeInit (t, e);
7394 exprNode_mergeUSs (ret, e);
7395 return ret;
7396}
7397
7398exprNode exprNode_iter (/*@observer@*/ uentry name,
7399 /*@only@*/ exprNodeList alist,
7400 /*@only@*/ exprNode body,
7401 /*@observer@*/ uentry end)
7402{
7403 exprNode ret;
7404 cstring iname;
7405
7406 llassert (uentry_isValid (name));
7407
7408 uentry_setUsed (name, exprNode_loc (body));
7409
7410 ret = exprNode_createPartialCopy (body);
7411 iname = uentry_getName (name);
7412
7413 if (uentry_isInvalid (end))
7414 {
7415 llerror (FLG_ITER,
7416 message ("Iter %s not balanced with end_%s", iname, iname));
7417 }
7418 else
7419 {
7420 cstring ename = uentry_getName (end);
7421
7422 if (!cstring_equalPrefix (ename, "end_"))
7423 {
7424 llerror (FLG_ITER, message ("Iter %s not balanced with end_%s: %s",
7425 iname, iname, ename));
7426 }
7427 else
7428 {
7429 if (!cstring_equal (iname, cstring_suffix (ename, 4)))
7430 {
7431 llerror (FLG_ITER,
7432 message ("Iter %s not balanced with end_%s: %s",
7433 iname, iname, ename));
7434 }
7435 }
7436
7437 cstring_free (ename);
7438 }
7439
7440 context_exitIterClause (body);
7441
7442 ret->kind = XPR_ITER;
7443 ret->edata = exprData_makeIter (name, alist, body, end);
7444
7445 if (uentry_isIter (name))
7446 {
7447 (void) checkArgsReal (name, body,
7448 uentry_getParams (name), alist, TRUE, ret);
7449 }
7450
7451 cstring_free (iname);
7452
7453 return ret;
7454}
7455
7456exprNode
7457exprNode_iterNewId (/*@only@*/ cstring s)
7458{
7459 exprNode e = exprNode_new ();
7460 uentry ue = uentryList_getN (uentry_getParams (getCurrentIter ()), iterParamNo ());
7461
7462 llassert (processingIterVars ());
7463
7464 e->loc = context_getSaveLocation ();
7465
7466 if (fileloc_isUndefined (e->loc))
7467 {
7468 fileloc_free (e->loc);
7469 e->loc = fileloc_copy (g_currentloc);
7470 }
7471
7472 e->uses = sRefSet_new ();
7473 e->sets = sRefSet_new ();
7474 e->msets = sRefSet_new ();
7475 e->kind = XPR_VAR;
7476 e->val = multiVal_unknown ();
7477 e->guards = guardSet_new ();
7478 e->sref = defref;
7479 e->isJumpPoint = FALSE;
7480 e->exitCode = XK_NEVERESCAPE;
7481
7482 /*> missing fields, detected by lclint <*/
7483 e->canBreak = FALSE;
7484 e->mustBreak = FALSE;
7485 e->etext = cstring_undefined;
7486
7487 if (uentry_isYield (ue))
7488 {
7489 uentry uue = uentry_makeVariable (s, uentry_getType (ue),
7490 fileloc_copy (e->loc),
7491 FALSE);
7492 sRef sr;
7493
7494 uue = usymtab_supEntrySrefReturn (uue);
7495
7496 sr = uentry_getSref (uue);
7497 sRef_mergeStateQuiet (sr, uentry_getSref (ue));
7498 sr = uentry_getSref (uue);
7499 sRef_setDefined (sr, e->loc);
7500
7501 e->typ = uentry_getType (uue);
7502 e->sref = sr;
7503 e->edata = exprData_makeId (uue);
7504 uentry_setUsed (uue, g_currentloc);
7505 }
7506 else
7507 {
7508 uentry uue;
7509
7510 sRef_setGlobalScope ();
7511 uue = uentry_makeVariableLoc (s, ctype_unknown);
7512
7513 e->typ = ctype_unknown;
7514 e->edata = exprData_makeId (uue);
7515
7516 uentry_setUsed (uue, e->loc);
7517 uentry_setHasNameError (uue);
7518
7519 if (context_getFlag (FLG_REPEATUNRECOG))
7520 {
7521 uentry_markOwned (uue);
7522 }
7523 else
7524 {
7525 usymtab_supGlobalEntry (uue);
7526 }
7527
7528 sRef_clearGlobalScope ();
7529
7530 voptgenerror (FLG_UNRECOG, message ("Unrecognized identifier: %s", s),
7531 e->loc);
7532 }
7533
7534
7535 cstring_free (s);
7536 return (e);
7537}
7538
7539exprNode
7540exprNode_iterExpr (/*@returned@*/ exprNode e)
7541{
7542 if (!processingIterVars ())
7543 {
7544 llcontbuglit ("checkIterParam: not in iter");
7545 return e;
7546 }
7547
7548 if (uentry_isYield (uentryList_getN (uentry_getParams (getCurrentIter ()),
7549 iterParamNo ())))
7550 {
7551 if (exprNode_isDefined (e))
7552 {
7553 if (fileloc_isDefined (e->loc))
7554 {
7555 voptgenerror
7556 (FLG_ITER,
7557 message ("Yield parameter is not simple identifier: %s",
7558 exprNode_unparse (e)),
7559 e->loc);
7560 }
7561 else
7562 {
7563 voptgenerror
7564 (FLG_ITER,
7565 message ("Yield parameter is not simple identifier: %s",
7566 exprNode_unparse (e)),
7567 g_currentloc);
7568
7569 }
7570 }
7571 }
7572 return e;
7573}
7574
7575exprNode
7576exprNode_iterId (/*@observer@*/ uentry c)
7577{
7578 uentry ue;
7579
7580 llassert (processingIterVars ());
7581
7582 ue = uentryList_getN (uentry_getParams (getCurrentIter ()),
7583 iterParamNo ());
7584
7585 if (uentry_isYield (ue))
7586 {
7587 ctype ct = uentry_getType (ue);
7588 exprNode e = exprNode_createPlain (ct);
7589 cstring name = uentry_getName (c);
7590 uentry le = uentry_makeVariable (name, ct, fileloc_undefined, FALSE);
7591
7592 uentry_setUsed (ue, g_currentloc);
7593 uentry_setHasNameError (ue);
7594
7595 cstring_free (name);
7596
7597 e->kind = XPR_VAR;
7598 e->edata = exprData_makeId (le);
7599 e->loc = context_getSaveLocation ();
7600 e->sref = uentry_getSref (le);
7601
7602 usymtab_supEntrySref (le);
7603
7604 if (!context_inHeader ())
7605 {
7606 if (optgenerror
7607 (FLG_ITER,
7608 message ("Yield parameter shadows local declaration: %q",
7609 uentry_getName (c)),
7610 fileloc_isDefined (e->loc) ? e->loc : g_currentloc))
7611 {
7612 uentry_showWhereDeclared (c);
7613 }
7614 }
7615
7616 return e;
7617 }
7618
7619 return (exprNode_fromIdentifierAux (c));
7620}
7621
7622exprNode exprNode_iterStart (/*@observer@*/ uentry name, /*@only@*/ exprNodeList alist)
7623{
7624 exprNode ret = exprNode_create (ctype_unknown);
7625
7626 ret->kind = XPR_ITERCALL;
7627 ret->edata = exprData_makeIterCall (name, alist);
7628
7629 if (uentry_isIter (name))
7630 {
7631 uentryList params = uentry_getParams (name);
7632
7633 if (context_inIterDef ()
7634 && uentryList_size (params) == exprNodeList_size (alist))
7635 {
7636 int i = 0;
7637
7638 exprNodeList_elements (alist, arg)
7639 {
7640 uentry parg = uentryList_getN (params, i);
7641
7642 if (uentry_isYield (parg))
7643 {
7644 uentry ue = exprNode_getUentry (arg);
7645
7646 if (uentry_isValid (ue))
7647 {
7648 ;
7649 }
7650 }
7651
7652 i++;
7653 } end_exprNodeList_elements;
7654 }
7655
7656 (void) checkArgsReal (name, ret, params, alist, TRUE, ret);
7657 checkUnspecCall (ret, params, alist);
7658 }
7659
7660 return ret;
7661}
7662
7663/*@exposed@*/ sRef exprNode_getSref (exprNode e)
7664{
7665 if (exprNode_isDefined (e))
7666 {
7667 /*@access sRef@*/
7668 if (e->sref == defref) /*@noaccess sRef@*/
7669 {
7670 /*@-mods@*/
7671 e->sref = sRef_makeUnknown ();
7672 sRef_setAliasKind (e->sref, AK_ERROR, fileloc_undefined);
7673 /*@=mods@*/
7674 return e->sref;
7675 }
7676 else
7677 {
7678 return e->sref;
7679 }
7680 }
7681 else
7682 {
7683 return sRef_undefined;
7684 }
7685}
7686
7687/*@observer@*/ cstring
7688exprNode_unparseFirst (exprNode e)
7689{
7690 if (exprNode_isDefined (e))
7691 {
7692 cstring ret;
7693
7694 if (e->kind == XPR_STMTLIST
7695 || e->kind == XPR_COMMA || e->kind == XPR_COND)
7696 {
7697 exprNode first = exprData_getPairA (e->edata);
7698
7699 if (exprNode_isDefined (first))
7700 {
7701 return (exprNode_unparseFirst (exprData_getPairA (e->edata)));
7702 }
7703 else
7704 {
7705 return (cstring_makeLiteralTemp ("..."));
7706 }
7707 }
7708
7709 ret = cstring_elide (exprNode_unparse (e), 20);
7710 cstring_markOwned (ret);
7711
7712 return (ret);
7713 }
7714 else
7715 {
7716 return cstring_makeLiteralTemp ("<error>");
7717 }
7718}
7719
7720/*@observer@*/ cstring
7721exprNode_unparse (exprNode e)
7722{
7723 if (exprNode_isError (e))
7724 {
7725 return cstring_makeLiteralTemp ("<error>");
7726 }
7727
7728 if (cstring_isDefined (e->etext))
7729 {
7730 return e->etext;
7731 }
7732 else
7733 {
7734 cstring ret = exprNode_doUnparse (e);
7735
7736 /*@-modifies@*/ /* benevolent */
7737 e->etext = ret;
7738 /*@=modifies@*/
7739 return ret;
7740 }
7741}
7742
7743/*@observer@*/ fileloc
7744exprNode_loc (exprNode e)
7745{
7746 if (exprNode_isError (e))
7747 {
7748 return (g_currentloc);
7749 }
7750 else
7751 {
7752 return (e->loc);
7753 }
7754}
7755
7756/*
7757** executes exprNode e
7758** recursively rexecutes as though in original parse using
7759** information in e->edata
7760*/
7761
7762static /*@only@*/ exprNodeList exprNodeList_effect (exprNodeList e)
7763{
7764 exprNodeList ret = exprNodeList_new ();
7765
7766 exprNodeList_elements (e, current)
7767 {
7768 exprNodeList_addh (ret, exprNode_effect (current));
7769 } end_exprNodeList_elements;
7770
7771 return ret;
7772}
7773
7774static /*@only@*/ exprNode exprNode_effect (exprNode e)
7775 /*@globals internalState@*/
7776{
7777 bool innerEffect = inEffect;
7778 exprNode ret;
7779 exprData data;
7780
7781 inEffect = TRUE;
7782
7783 context_clearJustPopped ();
7784
7785 if (exprNode_isError (e))
7786 {
7787 ret = exprNode_undefined;
7788 }
7789 else
7790 {
7791 /*
7792 ** Turn off expose and dependent transfer checking.
7793 ** Need to pass exposed internal nodes,
7794 ** [ copying would be a waste! ]
7795 ** [ Actually, I think I wasted a lot more time than its worth ]
7796 ** [ trying to do this. ]
7797 */
7798
7799 /*@-exposetrans@*/
7800 /*@-observertrans@*/
7801 /*@-dependenttrans@*/
7802
7803 data = e->edata;
7804
7805 switch (e->kind)
7806 {
7807 case XPR_PARENS:
7808 ret = exprNode_addParens (exprData_getUopTok (data),
7809 exprNode_effect (exprData_getUopNode (data)));
7810 break;
7811 case XPR_ASSIGN:
7812 ret = exprNode_assign (exprNode_effect (exprData_getOpA (data)),
7813 exprNode_effect (exprData_getOpB (data)),
7814 exprData_getOpTok (data));
7815 break;
7816 case XPR_INITBLOCK:
7817 ret = exprNode_undefined;
7818 break;
7819 case XPR_CALL:
7820 ret = exprNode_functionCall (exprNode_effect (exprData_getFcn (data)),
7821 exprNodeList_effect (exprData_getArgs (data)));
7822 break;
7823 case XPR_EMPTY:
7824 ret = e;
7825 break;
7826
7827 case XPR_LABEL:
7828 ret = e;
7829 break;
7830
7831 case XPR_CONST:
7832 case XPR_VAR:
7833 {
7834 cstring id = exprData_getId (data);
7835 uentry ue = usymtab_lookupSafe (id);
7836
7837 ret = exprNode_fromIdentifierAux (ue);
7838 ret->loc = fileloc_update (ret->loc, e->loc);
7839 break;
7840 }
7841 case XPR_BODY:
7842 ret = e;
7843 break;
7844 case XPR_FETCH:
7845 ret = exprNode_arrayFetch (exprNode_effect (exprData_getPairA (data)),
7846 exprNode_effect (exprData_getPairB (data)));
7847 break;
7848 case XPR_OP:
7849 ret = exprNode_op (exprNode_effect (exprData_getOpA (data)),
7850 exprNode_effect (exprData_getOpB (data)),
7851 exprData_getOpTok (data));
7852 break;
7853
7854 case XPR_POSTOP:
7855 ret = exprNode_postOp (exprNode_effect (exprData_getUopNode (data)),
7856 exprData_getUopTok (data));
7857 break;
7858 case XPR_PREOP:
7859 ret = exprNode_preOp (exprNode_effect (exprData_getUopNode (data)),
7860 exprData_getUopTok (data));
7861 break;
7862
7863 case XPR_OFFSETOF:
7864 case XPR_SIZEOFT:
7865 case XPR_SIZEOF:
7866 case XPR_ALIGNOFT:
7867 case XPR_ALIGNOF:
7868 ret = e;
7869 break;
7870
7871 case XPR_VAARG:
7872 ret = exprNode_vaArg (exprData_getCastTok (data),
7873 exprNode_effect (exprData_getCastNode (data)),
7874 exprData_getCastType (data));
7875 break;
7876
7877 case XPR_CAST:
7878 ret = exprNode_cast (exprData_getCastTok (data),
7879 exprNode_effect (exprData_getCastNode (data)),
7880 exprData_getCastType (data));
7881 break;
7882 case XPR_ITERCALL:
7883 ret = exprNode_iterStart (exprData_getIterCallIter (data),
7884 exprNodeList_effect
7885 (exprData_getIterCallArgs (data)));
7886 break;
7887
7888 case XPR_ITER:
7889 ret = exprNode_iter (exprData_getIterSname (data),
7890 exprNodeList_effect (exprData_getIterAlist (data)),
7891 exprNode_effect (exprData_getIterBody (data)),
7892 exprData_getIterEname (data));
7893 break;
7894
7895 case XPR_FOR:
7896 ret = exprNode_for (exprNode_effect (exprData_getPairA (data)),
7897 exprNode_effect (exprData_getPairB (data)));
7898 break;
7899
7900 case XPR_FORPRED:
7901 ret = exprNode_forPred (exprNode_effect (exprData_getTripleInit (data)),
7902 exprNode_effect (exprData_getTripleTest (data)),
7903 exprNode_effect (exprData_getTripleInc (data)));
7904 break;
7905
7906 case XPR_TOK:
7907 ret = exprNode_createTok (exprData_getTok (data));
7908 break;
7909
7910 case XPR_GOTO:
7911 ret = exprNode_goto (exprData_getLiteral (data));
7912 ret->loc = fileloc_update (ret->loc, e->loc);
7913 break;
7914
7915 case XPR_CONTINUE:
7916 ret = exprNode_continue (exprData_getTok (data), QSAFEBREAK);
7917 break;
7918
7919 case XPR_BREAK:
7920 ret = exprNode_break (exprData_getTok (data), QSAFEBREAK);
7921 break;
7922
7923 case XPR_RETURN:
7924 ret = exprNode_return (exprNode_effect (exprData_getSingle (data)));
7925 break;
7926
7927 case XPR_NULLRETURN:
7928 ret = exprNode_nullReturn (exprData_getTok (data));
7929 break;
7930
7931 case XPR_COMMA:
7932 ret = exprNode_comma (exprNode_effect (exprData_getPairA (data)),
7933 exprNode_effect (exprData_getPairB (data)));
7934 break;
7935
7936 case XPR_COND:
7937 ret = exprNode_cond (exprNode_effect (exprData_getTriplePred (data)),
7938 exprNode_effect (exprData_getTripleTrue (data)),
7939 exprNode_effect (exprData_getTripleFalse (data)));
7940 break;
7941 case XPR_IF:
7942 ret = exprNode_if (exprNode_effect (exprData_getPairA (data)),
7943 exprNode_effect (exprData_getPairB (data)));
7944 break;
7945
7946 case XPR_IFELSE:
7947 ret = exprNode_ifelse (exprNode_effect (exprData_getTriplePred (data)),
7948 exprNode_effect (exprData_getTripleTrue (data)),
7949 exprNode_effect (exprData_getTripleFalse (data)));
7950 break;
7951 case XPR_WHILEPRED:
7952 ret = exprNode_whilePred (exprData_getSingle (data));
7953 break;
7954
7955 case XPR_WHILE:
7956 ret = exprNode_while (exprNode_effect (exprData_getPairA (data)),
7957 exprNode_effect (exprData_getPairB (data)));
7958 break;
7959
7960 case XPR_DOWHILE:
7961 ret = exprNode_doWhile (exprNode_effect (exprData_getPairA (data)),
7962 exprNode_effect (exprData_getPairB (data)));
7963 break;
7964
7965 case XPR_BLOCK:
7966 ret = exprNode_makeBlock (exprNode_effect (exprData_getSingle (data)));
7967 break;
7968
7969 case XPR_STMT:
4cccc6ad 7970 ret = exprNode_statement (exprNode_effect (exprData_getUopNode (data)),
7971 exprData_getUopTok (data));
885824d3 7972 break;
7973
7974 case XPR_STMTLIST:
7975 ret = exprNode_concat (exprNode_effect (exprData_getPairA (data)),
7976 exprNode_effect (exprData_getPairB (data)));
7977 break;
7978
7979 case XPR_FTCASE:
7980 case XPR_CASE:
7981 ret = exprNode_caseMarker
7982 (exprNode_effect (exprData_getSingle (data)),
7983 TRUE);
7984 break;
7985
7986 case XPR_FTDEFAULT:
7987 case XPR_DEFAULT:
7988 ret = exprNode_createTok (exprData_getTok (data));
7989 break;
7990
7991 case XPR_SWITCH:
7992 ret = exprNode_switch (exprNode_effect (exprData_getPairA (data)),
7993 exprNode_effect (exprData_getPairB (data)));
7994 break;
7995
7996 case XPR_INIT:
7997 ret = exprNode_makeInitialization
7998 (exprData_getInitId (data),
7999 exprNode_effect (exprData_getInitNode (data)));
8000 break;
8001
8002 case XPR_FACCESS:
8003 ret = exprNode_fieldAccess (exprNode_effect (exprData_getFieldNode (data)),
8004 cstring_copy (exprData_getFieldName (data)));
8005 break;
8006
8007 case XPR_ARROW:
8008 ret = exprNode_arrowAccess (exprNode_effect (exprData_getFieldNode (data)),
8009 cstring_copy (exprData_getFieldName (data)));
8010 break;
8011
8012 case XPR_STRINGLITERAL:
8013 ret = e;
8014 break;
8015
8016 case XPR_NUMLIT:
8017 ret = e;
8018 break;
8019
8020 case XPR_NODE:
8021 ret = e;
8022 break;
8023 /*@-branchstate@*/
8024 }
8025 /*@=branchstate@*/
8026 /*@=observertrans@*/
8027 /*@=exposetrans@*/
8028 /*@=dependenttrans@*/
8029 }
8030
8031 if (!innerEffect)
8032 {
8033 inEffect = FALSE;
8034 }
8035
8036 return ret;
8037}
8038
8039static /*@observer@*/ cstring exprNode_rootVarName (exprNode e)
8040{
8041 cstring ret;
8042 exprData data;
8043
8044 if (exprNode_isError (e))
8045 {
8046 return cstring_undefined;
8047 }
8048
8049 data = e->edata;
8050
8051 switch (e->kind)
8052 {
8053 case XPR_PARENS:
8054 ret = exprNode_rootVarName (exprData_getUopNode (data));
8055 break;
8056 case XPR_ASSIGN:
8057 ret = exprNode_rootVarName (exprData_getOpA (data));
8058 break;
8059 case XPR_CONST:
8060 case XPR_VAR:
8061 ret = exprData_getId (data);
8062 break;
8063 case XPR_LABEL:
8064 case XPR_TOK:
8065 case XPR_ITERCALL:
8066 case XPR_EMPTY:
8067 case XPR_CALL:
8068 case XPR_INITBLOCK:
8069 case XPR_BODY:
8070 case XPR_FETCH:
8071 case XPR_OP:
8072 case XPR_POSTOP:
8073 case XPR_PREOP:
8074 case XPR_OFFSETOF:
8075 case XPR_ALIGNOFT:
8076 case XPR_ALIGNOF:
8077 case XPR_SIZEOFT:
8078 case XPR_SIZEOF:
8079 case XPR_VAARG:
8080 case XPR_CAST:
8081 case XPR_ITER:
8082 case XPR_FOR:
8083 case XPR_FORPRED:
8084 case XPR_BREAK:
8085 case XPR_RETURN:
8086 case XPR_NULLRETURN:
8087 case XPR_COMMA:
8088 case XPR_COND:
8089 case XPR_IF:
8090 case XPR_IFELSE:
8091 case XPR_WHILE:
8092 case XPR_WHILEPRED:
8093 case XPR_DOWHILE:
8094 case XPR_GOTO:
8095 case XPR_CONTINUE:
8096 case XPR_FTDEFAULT:
8097 case XPR_DEFAULT:
8098 case XPR_SWITCH:
8099 case XPR_FTCASE:
8100 case XPR_CASE:
8101 case XPR_BLOCK:
8102 case XPR_STMT:
8103 case XPR_STMTLIST:
8104 case XPR_INIT:
8105 case XPR_FACCESS:
8106 case XPR_ARROW:
8107 case XPR_NODE:
8108 case XPR_NUMLIT:
8109 case XPR_STRINGLITERAL:
8110 ret = cstring_undefined;
8111 break;
8112 }
8113
8114 return ret;
8115}
8116
a0a162cd 8117
885824d3 8118static /*@only@*/ cstring exprNode_doUnparse (exprNode e)
8119{
8120 cstring ret;
8121 exprData data;
8122
8123 if (exprNode_isError (e))
8124 {
8125 static /*@only@*/ cstring error = cstring_undefined;
8126
8127 if (!cstring_isDefined (error))
8128 {
8129 error = cstring_makeLiteral ("<error>");
8130 }
8131
8132 return error;
8133 }
8134
8135 data = e->edata;
8136
8137 switch (e->kind)
8138 {
8139 case XPR_PARENS:
8140 ret = message ("(%s)", exprNode_unparse (exprData_getUopNode (e->edata)));
8141 break;
8142 case XPR_ASSIGN:
8143 ret = message ("%s %s %s",
8144 exprNode_unparse (exprData_getOpA (data)),
8145 lltok_unparse (exprData_getOpTok (data)),
8146 exprNode_unparse (exprData_getOpB (data)));
8147 break;
8148 case XPR_CALL:
8149 ret = message ("%s(%q)",
8150 exprNode_unparse (exprData_getFcn (data)),
8151 exprNodeList_unparse (exprData_getArgs (data)));
8152 break;
8153 case XPR_INITBLOCK:
8154 ret = message ("{ %q }", exprNodeList_unparse (exprData_getArgs (data)));
8155 break;
8156 case XPR_EMPTY:
8157 ret = cstring_undefined;
8158 break;
8159 case XPR_LABEL:
8160 ret = message ("%s:", exprData_getId (data));
8161 break;
8162 case XPR_CONST:
8163 case XPR_VAR:
8164 ret = cstring_copy (exprData_getId (data));
8165 break;
8166 case XPR_FETCH:
8167 ret = message ("%s[%s]", exprNode_unparse (exprData_getPairA (data)),
8168 exprNode_unparse (exprData_getPairB (data)));
8169 break;
8170 case XPR_BODY:
8171 ret = message ("<body>");
8172 break;
8173 case XPR_OP:
8174 ret = message ("%s %s %s",
8175 exprNode_unparse (exprData_getOpA (data)),
8176 lltok_unparse (exprData_getOpTok (data)),
8177 exprNode_unparse (exprData_getOpB (data)));
8178 break;
8179
8180 case XPR_PREOP:
8181 ret = message ("%s%s",
8182 lltok_unparse (exprData_getUopTok (data)),
8183 exprNode_unparse (exprData_getUopNode (data)));
8184 break;
8185
8186 case XPR_POSTOP:
8187 ret = message ("%s%s",
8188 exprNode_unparse (exprData_getUopNode (data)),
8189 lltok_unparse (exprData_getUopTok (data)));
8190 break;
8191
8192 case XPR_OFFSETOF:
8193 ret = message ("offsetof(%s,%q)",
8194 ctype_unparse (qtype_getType (exprData_getOffsetType (data))),
8195 cstringList_unparseSep (exprData_getOffsetName (data), cstring_makeLiteralTemp (".")));
8196 break;
8197
8198 case XPR_SIZEOFT:
8199 ret = message ("sizeof(%s)", ctype_unparse (qtype_getType (exprData_getType (data))));
8200 break;
8201
8202 case XPR_SIZEOF:
8203 ret = message ("sizeof(%s)", exprNode_unparse (exprData_getSingle (data)));
8204 break;
8205
8206 case XPR_ALIGNOFT:
8207 ret = message ("alignof(%s)", ctype_unparse (qtype_getType (exprData_getType (data))));
8208 break;
8209
8210 case XPR_ALIGNOF:
8211 ret = message ("alignof(%s)", exprNode_unparse (exprData_getSingle (data)));
8212 break;
8213
8214 case XPR_VAARG:
8215 ret = message ("va_arg(%s, %q)",
8216 exprNode_unparse (exprData_getCastNode (data)),
8217 qtype_unparse (exprData_getCastType (data)));
8218 break;
8219
8220 case XPR_ITERCALL:
8221 ret = message ("%q(%q)",
8222 uentry_getName (exprData_getIterCallIter (data)),
8223 exprNodeList_unparse (exprData_getIterCallArgs (data)));
8224 break;
8225 case XPR_ITER:
8226 ret = message ("%q(%q) %s %q",
8227 uentry_getName (exprData_getIterSname (data)),
8228 exprNodeList_unparse (exprData_getIterAlist (data)),
8229 exprNode_unparse (exprData_getIterBody (data)),
8230 uentry_getName (exprData_getIterEname (data)));
8231 break;
8232 case XPR_CAST:
8233 ret = message ("(%q)%s",
8234 qtype_unparse (exprData_getCastType (data)),
8235 exprNode_unparse (exprData_getCastNode (data)));
8236 break;
8237
8238 case XPR_FOR:
8239 ret = message ("%s %s",
8240 exprNode_unparse (exprData_getPairA (data)),
8241 exprNode_unparse (exprData_getPairB (data)));
8242 break;
8243
8244 case XPR_FORPRED:
8245 ret = message ("for (%s; %s; %s)",
8246 exprNode_unparse (exprData_getTripleInit (data)),
8247 exprNode_unparse (exprData_getTripleTest (data)),
8248 exprNode_unparse (exprData_getTripleInc (data)));
8249 break;
8250
8251 case XPR_GOTO:
8252 ret = message ("goto %s", exprData_getLiteral (data));
8253 break;
8254
8255 case XPR_CONTINUE:
8256 ret = cstring_makeLiteral ("continue");
8257 break;
8258
8259 case XPR_BREAK:
8260 ret = cstring_makeLiteral ("break");
8261 break;
8262
8263 case XPR_RETURN:
8264 ret = message ("return %s", exprNode_unparse (exprData_getSingle (data)));
8265 break;
8266
8267 case XPR_NULLRETURN:
8268 ret = cstring_makeLiteral ("return");
8269 break;
8270
8271 case XPR_COMMA:
8272 ret = message ("%s, %s",
8273 exprNode_unparse (exprData_getPairA (data)),
8274 exprNode_unparse (exprData_getPairB (data)));
8275 break;
8276
8277 case XPR_COND:
8278 ret = message ("%s ? %s : %s",
8279 exprNode_unparse (exprData_getTriplePred (data)),
8280 exprNode_unparse (exprData_getTripleTrue (data)),
8281 exprNode_unparse (exprData_getTripleFalse (data)));
8282 break;
8283 case XPR_IF:
8284 ret = message ("if (%s) %s",
8285 exprNode_unparse (exprData_getPairA (data)),
8286 exprNode_unparse (exprData_getPairB (data)));
8287 break;
8288
8289 case XPR_IFELSE:
8290 ret = message ("if (%s) %s else %s",
8291 exprNode_unparse (exprData_getTriplePred (data)),
8292 exprNode_unparse (exprData_getTripleTrue (data)),
8293 exprNode_unparse (exprData_getTripleFalse (data)));
8294 break;
8295 case XPR_WHILE:
8296 ret = message ("while (%s) %s",
8297 exprNode_unparse (exprData_getPairA (data)),
8298 exprNode_unparse (exprData_getPairB (data)));
8299 break;
8300
8301 case XPR_WHILEPRED:
8302 ret = cstring_copy (exprNode_unparse (exprData_getSingle (data)));
8303 break;
8304
8305 case XPR_TOK:
8306 ret = cstring_copy (lltok_unparse (exprData_getTok (data)));
8307 break;
8308
8309 case XPR_DOWHILE:
8310 ret = message ("do { %s } while (%s)",
8311 exprNode_unparse (exprData_getPairB (data)),
8312 exprNode_unparse (exprData_getPairA (data)));
8313 break;
8314
8315 case XPR_BLOCK:
8316 ret = message ("{ %s }", exprNode_unparseFirst (exprData_getSingle (data)));
8317 break;
8318
8319 case XPR_STMT:
4cccc6ad 8320 ret = cstring_copy (exprNode_unparse (exprData_getUopNode (data)));
885824d3 8321 break;
8322
8323 case XPR_STMTLIST:
8324 ret = message ("%s; %s",
8325 exprNode_unparse (exprData_getPairA (data)),
8326 exprNode_unparse (exprData_getPairB (data)));
8327 break;
8328
8329 case XPR_FTDEFAULT:
8330 case XPR_DEFAULT:
8331 ret = cstring_makeLiteral ("default:");
8332 break;
8333
8334 case XPR_SWITCH:
8335 ret = message ("switch (%s) %s",
8336 exprNode_unparse (exprData_getPairA (data)),
8337 exprNode_unparse (exprData_getPairB (data)));
8338 break;
8339
8340 case XPR_FTCASE:
8341 case XPR_CASE:
8342 ret = message ("case %s:",
8343 exprNode_unparse (exprData_getSingle (data)));
8344 break;
8345
8346 case XPR_INIT:
8347 ret = message ("%s = %s",
8348 idDecl_getName (exprData_getInitId (data)),
8349 exprNode_unparse (exprData_getInitNode (data)));
8350 break;
8351
8352 case XPR_FACCESS:
8353 ret = message ("%s.%s",
8354 exprNode_unparse (exprData_getFieldNode (data)),
8355 exprData_getFieldName (data));
8356 break;
8357
8358 case XPR_ARROW:
8359 ret = message ("%s->%s",
8360 exprNode_unparse (exprData_getFieldNode (data)),
8361 exprData_getFieldName (data));
8362 break;
8363
8364 case XPR_STRINGLITERAL:
8365 ret = cstring_copy (exprData_getLiteral (data));
8366 break;
8367
8368 case XPR_NUMLIT:
8369 ret = cstring_copy (exprData_getLiteral (data));
8370 break;
8371
8372 case XPR_NODE:
8373 ret = cstring_makeLiteral ("<node>");
8374 break;
8375 }
8376
8377 return ret;
8378}
8379
8380bool
8381exprNode_isCharLit (exprNode e)
8382{
8383 if (exprNode_isDefined (e))
8384 {
8385 return (multiVal_isChar (exprNode_getValue (e)));
8386 }
8387 else
8388 {
8389 return FALSE;
8390 }
8391}
8392
8393bool
8394exprNode_isNumLit (exprNode e)
8395{
8396 if (exprNode_isDefined (e))
8397 {
8398 return (multiVal_isInt (exprNode_getValue (e)));
8399 }
8400 else
8401 {
8402 return FALSE;
8403 }
8404}
8405
8406static bool
8407exprNode_isFalseConstant (exprNode e)
8408{
8409 if (exprNode_isDefined (e))
8410 {
8411 cstring s = exprNode_rootVarName (e);
8412
8413 if (cstring_equal (s, context_getFalseName ()))
8414 {
8415 return TRUE;
8416 }
8417 }
8418
8419 return FALSE;
8420}
8421
8422bool
8423exprNode_matchLiteral (ctype expected, exprNode e)
8424{
8425 if (exprNode_isDefined (e))
8426 {
8427 multiVal m = exprNode_getValue (e);
8428
8429 if (multiVal_isDefined (m))
8430 {
8431 if (multiVal_isInt (m))
8432 {
8433 long int val = multiVal_forceInt (m);
8434
8435 if (ctype_isDirectBool (ctype_realishType (expected)))
8436 {
8437 if (val == 0)
8438 {
8439 return FALSE; /* really?! return TRUE; allow use of 0 for FALSE */
8440 }
8441 else
8442 {
8443 return FALSE;
8444 }
8445 }
8446
8447 if (ctype_isRealInt (expected))
8448 {
8449 /*
8450 ** unsigned <- [ constant >= 0 is okay ]
8451 */
8452
8453 if (ctype_isUnsigned (expected))
8454 {
8455 if (val < 0)
8456 {
8457 return FALSE;
8458 }
8459 }
8460
8461 /*
8462 ** No checks on sizes of integers...maybe add
8463 ** these later.
8464 */
8465
8466 DPRINTF (("Here: %s => %s", exprNode_unparse (e), ctype_unparse (expected)));
8467 DPRINTF (("Type: %s / %s", ctype_unparse (exprNode_getType (e)),
8468 bool_unparse (ctype_isInt (exprNode_getType (e)))));
8469
8470 if (context_getFlag (FLG_NUMLITERAL)
8471 && (ctype_isRegularInt (exprNode_getType (e)) || val == 0)) {
8472 return TRUE;
8473 } else {
8474 if (val == 0) {
8475 return TRUE;
8476 } else {
8477 return FALSE; /* evs 2000-05-17: previously, always returned TRUE */
8478 }
8479 }
8480 }
8481 else if (ctype_isChar (expected))
8482 {
8483 return FALSE;
8484 }
8485 else if (ctype_isArrayPtr (expected))
8486 {
8487 return (val == 0);
8488 }
8489 else if (ctype_isAnyFloat (expected))
8490 {
8491 return (context_getFlag (FLG_NUMLITERAL));
8492 }
8493 else
8494 {
8495 return FALSE;
8496 }
8497 }
8498 else if (multiVal_isDouble (m))
8499 {
8500 if (ctype_isAnyFloat (expected))
8501 {
8502 return TRUE;
8503 }
8504 }
8505 else if (multiVal_isChar (m))
8506 {
8507 char val = multiVal_forceChar (m);
8508
8509 if (ctype_isChar (expected))
8510 {
8511 if (ctype_isUnsigned (expected) && ((int)val) < 0)
8512 {
8513 return FALSE;
8514 }
8515 else
8516 {
8517 return TRUE;
8518 }
8519 }
8520 }
8521 else
8522 {
8523 return FALSE;
8524 }
8525 }
8526 }
8527
8528 return FALSE;
8529}
8530
8531bool
8532exprNode_matchType (ctype expected, exprNode e)
8533{
8534 ctype actual;
8535
8536 if (!exprNode_isDefined (e)) return TRUE;
8537
8538 actual = ctype_realishType (exprNode_getType (e));
8539
8540 if (ctype_match (ctype_realishType (expected), actual))
8541 {
8542 return TRUE;
8543 }
8544
8545 llassert (!exprNode_isError (e));
8546 return (exprNode_matchLiteral (expected, e));
8547}
8548
8549static bool
8550exprNode_matchTypes (exprNode e1, exprNode e2)
8551{
8552 ctype t1;
8553 ctype t2;
8554
8555 if (!exprNode_isDefined (e1)) return TRUE;
8556 if (!exprNode_isDefined (e2)) return TRUE;
8557
8558 /*
8559 ** realish type --- keep bools, bools
8560 */
8561
8562 t1 = ctype_realishType (exprNode_getType (e1));
8563 t2 = ctype_realishType (exprNode_getType (e2));
8564
8565 if (ctype_match (t1, t2))
8566 {
8567 return TRUE;
8568 }
8569
8570 return (exprNode_matchLiteral (t1, e2) || exprNode_matchLiteral (t2, e1));
8571}
8572
8573/*
8574** pass e as ct
8575*/
8576
8577static bool
8578 exprNode_matchArgType (ctype ct, exprNode e)
8579{
8580 ctype et;
8581
8582 if (!exprNode_isDefined (e))
8583 {
8584 return TRUE;
8585 }
8586
8587 et = ctype_realType (exprNode_getType (e));
8588
8589 if (ctype_matchArg (ct, et)) return TRUE;
8590
8591 llassert (!exprNode_isError (e));
8592 return (exprNode_matchLiteral (ct, e));
8593}
8594
8595static /*@only@*/ exprNodeSList
8596 exprNode_flatten (/*@dependent@*/ exprNode e) /*@*/
8597{
8598 if (exprNode_isDefined (e))
8599 {
8600 if (e->kind == XPR_STMTLIST)
8601 {
8602 return (exprNodeSList_append
8603 (exprNode_flatten (exprData_getPairA (e->edata)),
8604 exprNode_flatten (exprData_getPairB (e->edata))));
8605 }
8606 else if (e->kind == XPR_BLOCK)
8607 {
8608 return (exprNode_flatten (exprData_getSingle (e->edata)));
8609 }
8610 else
8611 {
8612 return (exprNodeSList_singleton (e));
8613 }
8614 }
8615
8616 return exprNodeSList_new ();
8617}
8618
8619static /*@exposed@*/ exprNode
8620exprNode_lastStatement (/*@returned@*/ exprNode e)
8621{
8622 if (exprNode_isDefined (e))
8623 {
8624 if (e->kind == XPR_STMTLIST)
8625 {
8626 exprNode b = exprData_getPairB (e->edata);
8627
8628 if (exprNode_isDefined (b))
8629 {
8630 return exprNode_lastStatement (b);
8631 }
8632 else
8633 {
8634 return exprNode_lastStatement (exprData_getPairA (e->edata));
8635 }
8636 }
8637 else if (e->kind == XPR_BLOCK)
8638 {
8639 return (exprNode_lastStatement (exprData_getSingle (e->edata)));
8640 }
8641 else
8642 {
8643 return (e);
8644 }
8645 }
8646
8647 return exprNode_undefined;
8648}
8649
8650static /*@exposed@*/ exprNode
8651exprNode_firstStatement (/*@returned@*/ exprNode e)
8652{
8653 if (exprNode_isDefined (e))
8654 {
8655 if (e->kind == XPR_STMTLIST)
8656 {
8657 exprNode b = exprData_getPairA (e->edata);
8658
8659 if (exprNode_isDefined (b))
8660 {
8661 return exprNode_firstStatement (b);
8662 }
8663 else
8664 {
8665 return exprNode_firstStatement (exprData_getPairB (e->edata));
8666 }
8667 }
8668 else if (e->kind == XPR_BLOCK)
8669 {
8670 return (exprNode_firstStatement (exprData_getSingle (e->edata)));
8671 }
8672 else
8673 {
8674 return (e);
8675 }
8676 }
8677
8678 return exprNode_undefined;
8679}
8680
8681static void
8682exprNode_mergeUSs (exprNode res, exprNode other)
8683{
8684 if (exprNode_isDefined (res) && exprNode_isDefined (other))
8685 {
8686 res->msets = sRefSet_union (res->msets, other->msets);
8687 res->sets = sRefSet_union (res->sets, other->sets);
8688 res->uses = sRefSet_union (res->uses, other->uses);
8689 }
8690}
8691
8692static void
8693exprNode_mergeCondUSs (exprNode res, exprNode other1, exprNode other2)
8694{
8695 if (exprNode_isDefined (res))
8696 {
8697 if (exprNode_isDefined (other1))
8698 {
8699 res->sets = sRefSet_union (res->sets, other1->sets);
8700 res->msets = sRefSet_union (res->msets, other1->msets);
8701 res->uses = sRefSet_union (res->uses, other1->uses);
8702 }
8703 if (exprNode_isDefined (other2))
8704 {
8705 res->sets = sRefSet_union (res->sets, other2->sets);
8706 res->msets = sRefSet_union (res->msets, other2->msets);
8707 res->uses = sRefSet_union (res->uses, other2->uses);
8708 }
8709 }
8710}
8711
8712/*
8713** modifies e->uses
8714**
8715** Reports errors is s is not defined.
8716*/
8717
8718static void
8719exprNode_addUse (exprNode e, sRef s)
8720{
8721 if (exprNode_isDefined (e))
8722 {
8723 e->uses = sRefSet_insert (e->uses, s);
8724 }
8725}
8726
8727void
8728exprNode_checkUse (exprNode e, sRef s, fileloc loc)
8729{
8730 if (sRef_isKnown (s) && !sRef_isConst (s))
8731 {
8732 /*
8733 ** need to check all outer types are useable
8734 */
8735
8736 DPRINTF (("Check use: %s / %s",
8737 exprNode_unparse (e), sRef_unparse (s)));
8738
8739 exprNode_addUse (e, s);
8740
8741 if (!context_inProtectVars ())
8742 {
8743 /*
8744 ** only report the deepest error
8745 */
8746
8747 sRef errorRef = sRef_undefined;
8748 sRef lastRef = sRef_undefined;
8749 bool deadRef = FALSE;
8750 bool unuseable = FALSE;
8751 bool errorMaybe = FALSE;
8752
8753 while (sRef_isValid (s) && sRef_isKnown (s))
8754 {
8755 ynm readable = sRef_isReadable (s);
8756
8757 if (!(ynm_toBoolStrict (readable)))
8758 {
8759 if (ynm_isMaybe (readable))
8760 {
8761 lastRef = errorRef;
8762 errorRef = s;
8763 deadRef = sRef_isPossiblyDead (errorRef);
8764 unuseable = sRef_isUnuseable (errorRef);
8765 errorMaybe = TRUE;
8766 }
8767 else
8768 {
8769 lastRef = errorRef;
8770 errorRef = s;
8771 deadRef = sRef_isDead (errorRef);
8772 unuseable = sRef_isUnuseable (errorRef);
8773 errorMaybe = FALSE;
8774 }
8775
8776 if (!sRef_isPartial (s))
8777 {
8778 sRef_setDefined (s, fileloc_undefined);
8779 }
8780 }
8781
8782 s = sRef_getBaseSafe (s);
8783 } /* end while */
8784
8785 if (sRef_isValid (errorRef))
8786 {
8787 if (sRef_isValid (lastRef) && sRef_isField (lastRef)
8788 && sRef_isPointer (errorRef))
8789 {
8790 errorRef = lastRef;
8791 }
8792
8793 if (deadRef)
8794 {
8795 if (sRef_isThroughArrayFetch (errorRef))
8796 {
8797 if (optgenerror
8798 (FLG_STRICTUSERELEASED,
8799 message ("%q %q may be used after being released",
8800 sRef_unparseKindNamePlain (errorRef),
8801 sRef_unparse (errorRef)),
8802 loc))
8803 {
8804 sRef_showRefKilled (errorRef);
8805
8806 if (sRef_isKept (errorRef))
8807 {
8808 sRef_clearAliasState (errorRef, loc);
8809 }
8810 }
8811 }
8812 else
8813 {
8814 DPRINTF (("HERE: %s", sRef_unparse (errorRef)));
8815
8816 if (optgenerror
8817 (FLG_USERELEASED,
8818 message ("%q %q %qused after being released",
8819 sRef_unparseKindNamePlain (errorRef),
8820 sRef_unparse (errorRef),
8821 cstring_makeLiteral (errorMaybe
8822 ? "may be " : "")),
8823 loc))
8824 {
8825 sRef_showRefKilled (errorRef);
8826
8827 if (sRef_isKept (errorRef))
8828 {
8829 sRef_clearAliasState (errorRef, loc);
8830 }
8831 }
8832 }
8833 }
8834 else if (unuseable)
8835 {
8836 if (optgenerror
8837 (FLG_USEDEF,
8838 message ("%q %q%qused in inconsistent state",
8839 sRef_unparseKindName (errorRef),
8840 sRef_unparseOpt (errorRef),
8841 cstring_makeLiteral (errorMaybe ? "may be " : "")),
8842 loc))
8843 {
8844 sRef_showStateInconsistent (errorRef);
8845 }
8846 }
8847 else
8848 {
8849 DPRINTF (("HERE: %s", sRef_unparse (errorRef)));
8850
8851 voptgenerror
8852 (FLG_USEDEF,
8853 message ("%q %q%qused before definition",
8854 sRef_unparseKindName (errorRef),
8855 sRef_unparseOpt (errorRef),
8856 cstring_makeLiteral (errorMaybe ? "may be " : "")),
8857 loc);
8858 }
8859
8860 sRef_setDefined (errorRef, loc);
8861
8862 if (sRef_isAddress (errorRef))
8863 {
8864 sRef_setDefined (sRef_getRootBase (errorRef), loc);
8865 }
8866 } /* end is error */
8867 }
8868 }
8869
8870 setCodePoint ();
8871}
8872
8873static void
8874checkSafeUse (exprNode e, sRef s)
8875{
8876 if (exprNode_isDefined (e) && sRef_isKnown (s))
8877 {
8878 e->uses = sRefSet_insert (e->uses, s);
8879 }
8880}
8881
8882static void
8883exprNode_checkSetAny (exprNode e, /*@dependent@*/ cstring name)
8884{
8885 if (exprNode_isDefined (e))
8886 {
8887 e->sets = sRefSet_insert (e->sets, sRef_makeUnconstrained (name));
8888 }
8889}
8890
8891void
8892exprNode_checkSet (exprNode e, sRef s)
8893{
8894 sRef defines = sRef_undefined;
8895
8896 if (sRef_isValid (s) && !sRef_isNothing (s))
8897 {
8898 uentry ue = sRef_getBaseUentry (s);
8899
8900 if (uentry_isValid (ue))
8901 {
8902 uentry_setLset (ue);
8903 }
8904
8905 if (!ynm_toBoolStrict (sRef_isWriteable (s)))
8906 {
8907 voptgenerror (FLG_USEDEF,
8908 message ("Attempt to set unuseable storage: %q",
8909 sRef_unparse (s)),
8910 exprNode_loc (e));
8911 }
8912
8913 if (sRef_isMeaningful (s))
8914 {
8915
8916 if (sRef_isDead (s))
8917 {
8918 sRef base = sRef_getBaseSafe (s);
8919
8920 if (sRef_isValid (base)
8921 && sRef_isDead (base))
8922 {
8923 sRef_setPartial (s, exprNode_loc (e));
8924 }
8925
8926 defines = s; /* okay - modifies for only param */
8927 }
8928 else if (sRef_isPartial (s))
8929 {
8930 sRef eref = exprNode_getSref (e);
8931
8932 if (!sRef_isPartial (eref))
8933 {
8934 /*
8935 ** should do something different here???
8936 */
8937
8938 sRef_setDefinedComplete (eref, exprNode_loc (e));
8939 }
8940 else
8941 {
8942 sRef_setPartialDefinedComplete (eref, exprNode_loc (e));
8943 }
8944
8945 if (sRef_isMeaningful (eref))
8946 {
8947 defines = eref;
8948 }
8949 else
8950 {
8951 defines = s;
8952 }
8953 }
8954 else if (sRef_isAllocated (s))
8955 {
8956 sRef eref = exprNode_getSref (e);
8957
8958
8959 if (!sRef_isAllocated (eref))
8960 {
8961 sRef_setDefinedComplete (eref, exprNode_loc (e));
8962 }
8963 else
8964 {
8965 sRef base = sRef_getBaseSafe (eref);
8966
8967 if (sRef_isValid (base))
8968 {
8969 sRef_setPdefined (base, exprNode_loc (e));
8970 }
8971 }
8972
8973 defines = s;
8974 }
8975 else
8976 {
8977 sRef_setDefinedNCComplete (s, exprNode_loc (e));
8978 defines = s;
8979 }
8980
8981 }
8982 else /* not meaningful...but still need to insert it */
8983 {
8984 defines = s;
8985 }
8986 }
8987
8988 if (exprNode_isDefined (e) && sRef_isValid (defines))
8989 {
8990 e->sets = sRefSet_insert (e->sets, defines);
8991 }
8992}
8993
8994void
8995exprNode_checkMSet (exprNode e, sRef s)
8996{
8997 if (sRef_isValid (s) && !sRef_isNothing (s))
8998 {
8999 uentry ue = sRef_getBaseUentry (s);
9000
9001 if (uentry_isValid (ue))
9002 {
9003 uentry_setLset (ue);
9004 }
9005
9006 if (!ynm_toBoolStrict (sRef_isWriteable (s)))
9007 {
9008 voptgenerror (FLG_USEDEF,
9009 message ("Attempt to set unuseable storage: %q", sRef_unparse (s)),
9010 exprNode_loc (e));
9011 }
9012
9013 if (sRef_isMeaningful (s))
9014 {
9015 sRef_setDefinedComplete (s, exprNode_loc (e));
9016 }
9017
9018 if (exprNode_isDefined (e))
9019 {
9020 e->msets = sRefSet_insert (e->msets, s);
9021 }
9022 }
9023}
9024
9025static void
9026checkUnspecCall (/*@notnull@*/ /*@dependent@*/ exprNode fcn, uentryList params, exprNodeList args)
9027{
9028 checkAnyCall (fcn, cstring_undefined, params, args,
9029 FALSE, sRefSet_undefined, FALSE, 0);
9030}
9031
9032static void
9033checkOneArg (uentry ucurrent, /*@notnull@*/ exprNode current,
9034 /*@dependent@*/ exprNode fcn, bool isSpec, int argno, int totargs)
9035{
9036 setCodePoint ();
9037
9038 if (uentry_isYield (ucurrent))
9039 {
9040 sRef_setDefined (exprNode_getSref (current), exprNode_loc (current));
9041 exprNode_checkSet (current, current->sref);
9042 }
9043 else
9044 {
9045 if (uentry_isSefParam (ucurrent))
9046 {
9047 sRefSet sets = current->sets;
9048 sRef ref = exprNode_getSref (current);
9049
9050 if (sRef_isMacroParamRef (ref))
9051 {
9052 uentry ue = sRef_getUentry (ref);
9053
9054 if (!uentry_isSefParam (ue))
9055 {
9056 voptgenerror
9057 (FLG_SEFPARAMS,
9058 message
9059 ("Parameter %d to %s is declared sef, but "
9060 "the argument is a macro parameter declared "
9061 "without sef: %s",
9062 argno, exprNode_unparse (fcn),
9063 exprNode_unparse (current)),
9064 exprNode_loc (current));
9065 }
9066 }
9067
9068 if (!sRefSet_isEmpty (sets))
9069 {
9070 sRefSet reported = sRefSet_undefined;
9071
9072 sRefSet_realElements (current->sets, el)
9073 {
9074 if (sRefSet_isSameNameMember (reported, el))
9075 {
9076 ; /* don't report again */
9077 }
9078 else
9079 {
9080 if (sRef_isUnconstrained (el))
9081 {
9082 voptgenerror
9083 (FLG_SEFUNSPEC,
9084 message
9085 ("Parameter %d to %s is declared sef, but "
9086 "the argument calls unconstrained function %s "
9087 "(no guarantee it will not modify something): %s",
9088 argno, exprNode_unparse (fcn),
9089 sRef_unconstrainedName (el),
9090 exprNode_unparse (current)),
9091 exprNode_loc (current));
9092 }
9093 else
9094 {
9095 voptgenerror
9096 (FLG_SEFPARAMS,
9097 message
9098 ("Parameter %d to %s is declared sef, but "
9099 "the argument may modify %q: %s",
9100 argno, exprNode_unparse (fcn),
9101 sRef_unparse (el),
9102 exprNode_unparse (current)),
9103 exprNode_loc (current));
9104 }
9105 }
9106 } end_sRefSet_realElements;
9107 }
9108 }
9109
9110 checkPassTransfer (current, ucurrent, isSpec, fcn, argno, totargs);
9111 exprNode_mergeUSs (fcn, current);
9112 }
9113}
9114
9115static void
9116 checkAnyCall (/*@dependent@*/ exprNode fcn,
9117 /*@dependent@*/ cstring fname,
9118 uentryList pn,
9119 exprNodeList args,
9120 bool hasMods, sRefSet mods,
9121 bool isSpec,
9122 int specialArgs)
9123{
9124 int paramno = 0;
9125 int nargs = exprNodeList_size (args);
9126
9127 setCodePoint ();
9128
9129 /*
9130 ** concat all args ud's to f, add each arg sref as a use unless
9131 ** it was specified as "out", in which case it is a def.
9132 */
9133
9134 uentryList_reset (pn);
9135
9136 /*
9137 ** aliasing checks:
9138 **
9139 ** if paramn is only or unique, no other arg may alias argn
9140 */
9141
9142 exprNodeList_elements (args, current)
9143 {
9144 paramno++;
9145
9146 if (exprNode_isDefined (current))
9147 {
9148 if ((!uentryList_isUndefined (pn) && !uentryList_isFinished (pn)))
9149 {
9150 uentry ucurrent = uentryList_current (pn);
9151
9152 if (specialArgs == 0
9153 || (paramno < specialArgs))
9154 {
9155 checkOneArg (ucurrent, current, fcn, isSpec, paramno, nargs);
9156
9157 if (context_maybeSet (FLG_ALIASUNIQUE))
9158 {
9159 if (uentry_isOnly (ucurrent)
9160 || uentry_isUnique (ucurrent))
9161 {
9162 checkUniqueParams (fcn, current, args,
9163 paramno, ucurrent);
9164 }
9165 }
9166 }
9167 }
9168 else /* uentry is undefined */
9169 {
9170 if (specialArgs == 0)
9171 {
9172 exprNode_checkUseParam (current);
9173 }
9174
9175 exprNode_mergeUSs (fcn, current);
9176 }
9177 }
9178 uentryList_advanceSafe (pn);
9179 } end_exprNodeList_elements;
9180
9181 if (hasMods)
9182 {
9183 setCodePoint ();
9184
9185 sRefSet_allElements (mods, s)
9186 {
9187 sRef fb;
9188 sRef rb = sRef_getRootBase (s);
9189
9190 if (sRef_isGlobal (rb))
9191 {
9192 context_usedGlobal (rb);
9193 }
9194
9195 fb = sRef_fixBaseParam (s, args);
9196
9197 if (!sRef_isMacroParamRef (fb))
9198 {
9199 if (sRef_isNothing (fb))
9200 {
9201 ;
9202 }
9203 else
9204 {
9205 if (sRef_isValid (fb))
9206 {
9207 uentry ue = sRef_getBaseUentry (s);
9208
9209 if (uentry_isValid (ue))
9210 {
9211 uentry_setLset (ue);
9212 }
9213 }
9214
9215 fcn->sets = sRefSet_insert (fcn->sets, fb);
9216 }
9217 }
9218 sRef_clearDerivedComplete (s);
9219 } end_sRefSet_allElements;
9220
9221 setCodePoint ();
9222 }
9223 else
9224 {
9225 if (context_hasMods ())
9226 {
9227 if (context_maybeSet (FLG_MODUNCON))
9228 {
9229 voptgenerror
9230 (FLG_MODUNCON,
9231 message ("Undetected modification possible "
9232 "from call to unconstrained function %s: %s",
9233 fname,
9234 exprNode_unparse (fcn)),
9235 exprNode_loc (fcn));
9236 }
9237 }
9238 else
9239 {
9240 if (context_maybeSet (FLG_MODUNCONNOMODS)
9241 && !(context_inIterDef () || context_inIterEnd ()))
9242 {
9243 voptgenerror
9244 (FLG_MODUNCONNOMODS,
9245 message ("Undetected modification possible "
9246 "from call to unconstrained function %s: %s",
9247 fname,
9248 exprNode_unparse (fcn)),
9249 exprNode_loc (fcn));
9250 }
9251 }
9252
9253 exprNode_checkSetAny (fcn, fname);
9254 }
9255}
9256
9257void exprNode_checkUseParam (exprNode current)
9258{
9259 if (exprNode_isDefined (current))
9260 {
9261 exprNode_checkUse (current, current->sref, current->loc);
9262 }
9263}
9264
9265static ctype
9266 checkNumerics (ctype tr1, ctype tr2, ctype te1, ctype te2,
9267 /*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2,
9268 lltok op)
9269{
9270 ctype ret = tr1;
9271
9272 if (!ctype_match (tr1, tr2))
9273 {
9274 if ((ctype_isRealInt (tr1) || ctype_isReal (tr1)) &&
9275 (ctype_isRealInt (tr2) || ctype_isReal (tr2)))
9276 {
9277 ;
9278 }
9279 else
9280 {
9281 (void) gentypeerror
9282 (tr1, e1, tr2, e2,
9283 message ("Incompatible types for %s (%s, %s): %s %s %s",
9284 lltok_unparse (op),
9285 ctype_unparse (te1),
9286 ctype_unparse (te2),
9287 exprNode_unparse (e1), lltok_unparse (op),
9288 exprNode_unparse (e2)),
9289 e1->loc);
9290 }
9291 ret = ctype_unknown;
9292 }
9293 else
9294 {
9295 if (ctype_isForceRealNumeric (&tr1) && ctype_isForceRealNumeric (&tr2))
9296 {
9297 ret = ctype_resolveNumerics (tr1, tr2);
9298 }
9299 else if (!context_msgStrictOps ())
9300 {
9301 if (ctype_isPointer (tr1))
9302 {
9303 if (ctype_isPointer (tr2) && !exprNode_isNullValue (e2))
9304 {
9305 ret = ctype_int;
9306 }
9307 else if (ctype_isInt (tr2))
9308 {
9309 ret = te1;
9310 }
9311 else
9312 {
9313 ret = ctype_unknown;
9314 }
9315 }
9316 else if (ctype_isPointer (tr2))
9317 {
9318 if (ctype_isPointer (tr1))
9319 {
9320 ret = ctype_int;
9321 }
9322 else if (ctype_isInt (tr1))
9323 {
9324 ret = te2;
9325 }
9326 else
9327 {
9328 ret = ctype_unknown;
9329 }
9330 }
9331 else
9332 {
9333 ret = ctype_resolveNumerics (tr1, tr2);
9334 }
9335 }
9336 else
9337 {
9338 int opid = lltok_getTok (op);
9339 bool comparop = (opid == EQ_OP || opid == NE_OP
9340 || opid == TLT || opid == TGT
9341 || opid == LE_OP || opid == GE_OP);
9342
9343 if (!ctype_isNumeric (tr1) && !ctype_isNumeric (tr2))
9344 {
9345 if (comparop
9346 && ((ctype_isEnum (tr1) && ctype_isEnum (tr2))
9347 || (ctype_isBool (tr1) && ctype_isBool (tr2))
9348 || (ctype_isChar (tr1) && ctype_isChar (tr2))))
9349 {
9350 ; /* no error */
9351 }
9352 else
9353 {
9354 if (ctype_sameName (te1, te2))
9355 {
9356 voptgenerror
9357 (FLG_STRICTOPS,
9358 message ("Operands of %s are non-numeric (%t): %s %s %s",
9359 lltok_unparse (op), te1,
9360 exprNode_unparse (e1), lltok_unparse (op),
9361 exprNode_unparse (e2)),
9362 e1->loc);
9363 }
9364 else
9365 {
9366 voptgenerror
9367 (FLG_STRICTOPS,
9368 message ("Operands of %s are non-numerics (%t, %t): %s %s %s",
9369 lltok_unparse (op), te1, te2,
9370 exprNode_unparse (e1), lltok_unparse (op),
9371 exprNode_unparse (e2)),
9372 e1->loc);
9373 }
9374 }
9375 }
9376 else if (!ctype_isNumeric (tr1))
9377 {
9378 voptgenerror
9379 (FLG_STRICTOPS,
9380 message ("Right operand of %s is non-numeric (%t): %s %s %s",
9381 lltok_unparse (op), te1,
9382 exprNode_unparse (e1), lltok_unparse (op),
9383 exprNode_unparse (e2)),
9384 e1->loc);
9385 }
9386 else
9387 {
9388 if (!ctype_isNumeric (tr2))
9389 {
9390 voptgenerror
9391 (FLG_STRICTOPS,
9392 message ("Left operand of %s is non-numeric (%t): %s %s %s",
9393 lltok_unparse (op), te2,
9394 exprNode_unparse (e1), lltok_unparse (op),
9395 exprNode_unparse (e2)),
9396 e2->loc);
9397 }
9398 }
9399
9400 ret = ctype_unknown;
9401 }
9402 }
9403
9404 return ret;
9405}
9406
9407static void
9408abstractOpError (ctype tr1, ctype tr2, lltok op,
9409 /*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2,
9410 fileloc loc1, fileloc loc2)
9411{
9412 if (ctype_isRealAbstract (tr1) && ctype_isRealAbstract (tr2))
9413 {
9414 if (ctype_match (tr1, tr2))
9415 {
9416 voptgenerror
9417 (FLG_ABSTRACT,
9418 message ("Operands of %s are abstract type (%t): %s %s %s",
9419 lltok_unparse (op), tr1,
9420 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
9421 loc1);
9422 }
9423 else
9424 {
9425 voptgenerror
9426 (FLG_ABSTRACT,
9427 message ("Operands of %s are abstract types (%t, %t): %s %s %s",
9428 lltok_unparse (op), tr1, tr2,
9429 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
9430 loc1);
9431 }
9432 }
9433 else if (ctype_isRealAbstract (tr1))
9434 {
9435 voptgenerror
9436 (FLG_ABSTRACT,
9437 message ("Left operand of %s is abstract type (%t): %s %s %s",
9438 lltok_unparse (op), tr1,
9439 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
9440 loc1);
9441 }
9442 else
9443 {
9444 if (ctype_isRealAbstract (tr2))
9445 {
9446 voptgenerror
9447 (FLG_ABSTRACT,
9448 message ("Right operand of %s is abstract type (%t): %s %s %s",
9449 lltok_unparse (op), tr2,
9450 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
9451 loc2);
9452 }
9453 }
9454}
9455
9456/*
9457** e1 <= e2
9458**
9459** requies e1 and e2 and not error exprNode's.
9460**
9461** Checks:
9462**
9463** If e1 is a component of an abstract type, and e2 is mutable and client-visible,
9464** the rep of the abstract type is exposed.
9465**
9466** The order is very important:
9467**
9468** check rep expose (move into check transfer)
9469** check transfer
9470** setup aliases
9471*/
9472
9473/*
9474** This isn't really a sensible procedure, but the indententation
9475** was getting too deep.
9476*/
9477
9478static void
9479checkOneRepExpose (sRef ysr, sRef base,
9480 /*@notnull@*/ exprNode e1,
9481 /*@notnull@*/ exprNode e2, ctype ct,
9482 sRef s2b)
9483{
9484 if (!(sRef_isOnly (ysr) || sRef_isKeep (ysr)
9485 || sRef_isOwned (ysr) || sRef_isExposed (ysr)))
9486 {
9487 if (sRef_isAnyParam (base) && !sRef_isExposed (base))
9488 {
9489 if (sRef_isIReference (ysr))
9490 {
9491 if (sRef_sameName (base, sRef_getRootBase (e2->sref)))
9492 {
9493 voptgenerror
9494 (FLG_ASSIGNEXPOSE,
9495 message
9496 ("Assignment of mutable component of parameter %q "
9497 "to component of abstract "
9498 "type %s exposes rep: %s = %s",
9499 sRef_unparse (base),
9500 ctype_unparse (ct),
9501 exprNode_unparse (e1), exprNode_unparse (e2)),
9502 e1->loc);
9503 }
9504 else
9505 {
9506 voptgenerror
9507 (FLG_ASSIGNEXPOSE,
9508 message
9509 ("Assignment of mutable component of parameter %q "
9510 "(through alias %q) to component of abstract "
9511 "type %s exposes rep: %s = %s",
9512 sRef_unparse (base),
9513 sRef_unparse (e2->sref),
9514 ctype_unparse (ct),
9515 exprNode_unparse (e1), exprNode_unparse (e2)),
9516 e1->loc);
9517 }
9518 }
9519 else
9520 {
9521 if (sRef_sameName (base, sRef_getRootBase (e2->sref)))
9522 {
9523 voptgenerror
9524 (FLG_ASSIGNEXPOSE,
9525 message ("Assignment of mutable parameter %q "
9526 "to component of abstract type %s "
9527 "exposes rep: %s = %s",
9528 sRef_unparse (base),
9529 ctype_unparse (ct),
9530 exprNode_unparse (e1),
9531 exprNode_unparse (e2)),
9532 e1->loc);
9533 }
9534 else
9535 {
9536 voptgenerror
9537 (FLG_ASSIGNEXPOSE,
9538 message ("Assignment of mutable parameter %q "
9539 "(through alias %q) to "
9540 "component of abstract type %s exposes "
9541 "rep: %s = %s",
9542 sRef_unparse (base),
9543 sRef_unparse (e2->sref),
9544 ctype_unparse (ct),
9545 exprNode_unparse (e1),
9546 exprNode_unparse (e2)),
9547 e1->loc);
9548 }
9549 }
9550 }
9551
9552 if (sRef_isGlobal (s2b))
9553 {
9554 if (sRef_sameName (base, sRef_getRootBase (e2->sref)))
9555 {
9556 voptgenerror
9557 (FLG_REPEXPOSE,
9558 message ("Assignment of global %q "
9559 "to component of "
9560 "abstract type %s exposes rep: %s = %s",
9561 sRef_unparse (base),
9562 ctype_unparse (ct),
9563 exprNode_unparse (e1), exprNode_unparse (e2)),
9564 e1->loc);
9565 }
9566 else
9567 {
9568 voptgenerror
9569 (FLG_REPEXPOSE,
9570 message ("Assignment of global %q (through alias %q) "
9571 "to component of "
9572 "abstract type %s exposes rep: %s = %s",
9573 sRef_unparse (base),
9574 sRef_unparse (e2->sref),
9575 ctype_unparse (ct),
9576 exprNode_unparse (e1), exprNode_unparse (e2)),
9577 e1->loc);
9578 }
9579 }
9580 }
9581}
9582
9583static void
9584doAssign (/*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2, bool isInit)
9585{
9586 if (ctype_isRealFunction (exprNode_getType (e1))
9587 && !ctype_isRealPointer (exprNode_getType (e1)))
9588 {
9589 voptgenerror
9590 (FLG_TYPE,
9591 message ("Invalid left-hand side of assignment (function type %s): %s",
9592 ctype_unparse (exprNode_getType (e1)),
9593 exprNode_unparse (e1)),
9594 e1->loc);
9595 }
9596
9597 if (context_getFlag (FLG_ASSIGNEXPOSE) && ctype_isMutable (e2->typ))
9598 {
9599 ctype t2 = exprNode_getType (e2);
9600 sRef sr = sRef_getRootBase (e1->sref);
9601 ctype ct = sRef_getType (sr);
9602
9603 if (ctype_isAbstract (t2)
9604 && !(uentry_isMutableDatatype (usymtab_getTypeEntry (ctype_typeId (t2)))))
9605 {
9606 /* it is immutable, okay to reference */
9607 goto donerepexpose;
9608 }
9609
9610 if (ctype_isAbstract (ct) && sRef_isIReference (e1->sref))
9611 {
9612 sRef s2b = sRef_getRootBase (e2->sref);
9613 sRef s1 = e1->sref;
9614 sRef s1b = sRef_getRootBase (s1);
9615 sRefSet aliases;
9616
9617 aliases = usymtab_canAlias (e2->sref);
9618
9619 if (!sRef_similar (s2b, s1b)
9620 && !sRef_isExposed (s1)
9621 && !(sRef_isOnly (s2b) || sRef_isKeep (s2b) || sRef_isExposed (s2b)))
9622 {
9623 if (sRef_isAnyParam (s2b) && !sRef_isOnly (s2b)
9624 && !sRef_isOwned (s2b) && !sRef_isKeep (s2b)
9625 && !sRef_isExposed (s2b))
9626 {
9627 if (sRef_isIReference (e2->sref))
9628 {
9629 voptgenerror
9630 (FLG_ASSIGNEXPOSE,
9631 message
9632 ("Assignment of mutable component of parameter %q "
9633 "to component of abstract type %s exposes rep: %s = %s",
9634 sRef_unparse (s2b),
9635 ctype_unparse (ct),
9636 exprNode_unparse (e1), exprNode_unparse (e2)),
9637 e1->loc);
9638 }
9639 else
9640 {
9641 voptgenerror
9642 (FLG_ASSIGNEXPOSE,
9643 message ("Assignment of mutable parameter %q to "
9644 "component of abstract type %s exposes rep: %s = %s",
9645 sRef_unparse (s2b),
9646 ctype_unparse (ct),
9647 exprNode_unparse (e1), exprNode_unparse (e2)),
9648 e1->loc);
9649 }
9650 }
9651
9652 if (sRef_isGlobal (s2b))
9653 {
9654 voptgenerror
9655 (FLG_ASSIGNEXPOSE,
9656 message ("Assignment of global %q to component of "
9657 "abstract type %s exposes rep: %s = %s",
9658 sRef_unparse (s2b),
9659 ctype_unparse (ct),
9660 exprNode_unparse (e1), exprNode_unparse (e2)),
9661 e1->loc);
9662 }
9663
9664 sRefSet_realElements (aliases, ysr)
9665 {
9666 sRef base = sRef_getRootBase (ysr);
9667
9668 if (sRef_similar (ysr, s2b) || sRef_similar (s1b, base)
9669 || sRef_sameName (base, s1b))
9670 {
9671 ; /* error already reported or same sref */
9672 }
9673 else
9674 {
9675 checkOneRepExpose (ysr, base, e1, e2, ct, s2b);
9676 }
9677 } end_sRefSet_realElements;
9678 }
9679 sRefSet_free (aliases);
9680 }
9681 }
9682
9683 donerepexpose:
9684
9685 /*
9686 ** function variables don't really work...
9687 */
9688
9689 if (!ctype_isFunction (ctype_realType (e2->typ)))
9690 {
9691 if (isInit)
9692 {
9693 checkInitTransfer (e1, e2);
9694 }
9695 else
9696 {
9697 checkAssignTransfer (e1, e2);
9698 }
9699 }
9700 else
9701 {
9702 sRef fref = e2->sref;
9703
9704 sRef_setDefState (e1->sref, sRef_getDefState (fref), e1->loc);
9705 sRef_setNullState (e1->sref, sRef_getNullState (fref), e1->loc);
9706
9707 /* Need to typecheck the annotation on the parameters */
9708
9709 if (ctype_isRealFunction (e1->typ)) {
9710 uentryList e1p = ctype_argsFunction (ctype_realType (e1->typ));
9711 uentryList e2p = ctype_argsFunction (ctype_realType (e2->typ));
9712
9713 if (!uentryList_isMissingParams (e1p)
9714 && !uentryList_isMissingParams (e2p)
9715 && uentryList_size (e1p) > 0) {
9716 if (uentryList_size (e1p) == uentryList_size (e2p)) {
9717 int n = 0;
9718
9719 uentryList_elements (e1p, el1) {
9720 uentry el2;
9721
9722 el2 = uentryList_getN (e2p, n);
9723 n++;
9724 uentry_checkMatchParam (el1, el2, n, e2);
9725 } end_uentryList_elements;
9726 }
9727 }
9728 }
9729 }
9730
9731 if (isInit && sRef_isGlobal (e1->sref))
9732 {
9733 ;
9734 }
9735 else
9736 {
9737 updateAliases (e1, e2);
9738 }
a0a162cd 9739 updateEnvironment (e1, e2);
885824d3 9740}
9741
9742static void
9743checkMacroParen (exprNode e)
9744{
9745 if (exprNode_isError (e) || e->kind == XPR_CAST)
9746 {
9747 ;
9748 }
9749 else
9750 {
9751 if (sRef_isUnsafe (e->sref) && !exprNode_isInParens (e))
9752 {
9753 voptgenerror
9754 (FLG_MACROPARENS,
9755 message ("Macro parameter used without parentheses: %s",
9756 exprNode_unparse (e)),
9757 e->loc);
9758 }
9759 }
9760}
9761
9762static void
9763reflectNullTest (/*@notnull@*/ exprNode e, bool isnull)
9764{
9765 if (isnull)
9766 {
9767 e->guards = guardSet_addTrueGuard (e->guards, e->sref);
9768 }
9769 else
9770 {
9771 e->guards = guardSet_addFalseGuard (e->guards, e->sref);
9772 }
9773}
9774
9775/*
9776** e1 <= e2
9777**
9778** if e2 is a parameter or global derived location which
9779** can be modified (that is, e2 is a mutable abstract type,
9780** or a derived pointer), then e1 can alias e2.
9781**
9782** e1 can alias everything which e2 can alias.
9783**
9784** Also, if e1 is guarded, remove from guard sets!
9785*/
9786
9787static void updateAliases (/*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2)
9788{
9789 if (!context_inProtectVars ())
9790 {
9791 /*
9792 ** depends on types of e1 and e2
9793 */
9794
9795 sRef s1 = e1->sref;
9796 sRef s2 = e2->sref;
9797 ctype t1 = exprNode_getType (e1);
9798
9799 /* handle pointer sRefs, record fields, arrays, etc... */
9800
9801 if (!ctype_isRealSU (t1))
9802 {
9803 sRef_copyRealDerivedComplete (s1, s2);
9804 }
9805
9806 if (ctype_isMutable (t1) && sRef_isKnown (s1))
9807 {
9808 usymtab_clearAlias (s1);
9809 usymtab_addMustAlias (s1, s2);
9810 }
9811
9812 if (sRef_possiblyNull (s1) && usymtab_isGuarded (s1))
9813 {
9814 usymtab_unguard (s1);
9815 }
9816 }
9817}
9818
9819exprNode exprNode_updateLocation (/*@returned@*/ exprNode e, /*@temp@*/ fileloc loc)
9820{
9821 if (exprNode_isDefined (e))
9822 {
9823 e->loc = fileloc_update (e->loc, loc);
9824 }
9825 else
9826 {
9827 e = exprNode_createLoc (ctype_unknown, fileloc_copy (loc));
9828 }
9829
9830 return (e);
9831}
9832
9833static void checkUniqueParams (exprNode fcn,
9834 /*@notnull@*/ exprNode current,
9835 exprNodeList args,
9836 int paramno, uentry ucurrent)
9837{
9838 int iparamno = 0;
9839 sRef thisref = exprNode_getSref (current);
9840
9841 /*
9842 ** Check if any argument could match this argument.
9843 */
9844
9845 exprNodeList_elements (args, icurrent)
9846 {
9847 iparamno++;
9848
9849 if (iparamno != paramno)
9850 {
9851 sRef sr = exprNode_getSref (icurrent);
9852
9853 if (sRef_similarRelaxed (thisref, sr))
9854 {
9855 if (!sRef_isConst (thisref) && !sRef_isConst (sr))
9856 {
9857 voptgenerror
9858 (FLG_ALIASUNIQUE,
9859 message
9860 ("Parameter %d (%s) to function %s is declared %s but "
9861 "is aliased by parameter %d (%s)",
9862 paramno,
9863 exprNode_unparse (current),
9864 exprNode_unparse (fcn),
9865 alkind_unparse (uentry_getAliasKind (ucurrent)),
9866 iparamno, exprNode_unparse (icurrent)),
9867 current->loc);
9868 }
9869 }
9870 else
9871 {
9872 sRefSet aliases = usymtab_canAlias (sr);
9873
9874 sRefSet_allElements (aliases, asr)
9875 {
9876 if (ctype_isUnknown (sRef_getType (thisref)))
9877 {
9878 sRef_setType (thisref, uentry_getType (ucurrent));
9879 }
9880
9881 if (sRef_similarRelaxed (thisref, asr))
9882 {
9883 if (sRef_isExternal (asr))
9884 {
9885 if (sRef_isLocalState (thisref))
9886 {
9887 ; /* okay */
9888 }
9889 else
9890 {
9891 sRef base = sRef_getRootBase (asr);
9892
9893 if (!sRef_similar (sRef_getBase (asr), thisref))
9894 {
9895 if (sRef_isUnique (base) || sRef_isOnly (base)
9896 || sRef_isKept (base)
9897 || (sRef_isAddress (asr) && sRef_isLocalVar (base))
9898 || (sRef_isAddress (thisref)
9899 && sRef_isLocalVar (sRef_getRootBase (thisref))))
9900 {
9901 ; /* okay, no error */
9902 }
9903 else
9904 {
9905 voptgenerror
9906 (FLG_MAYALIASUNIQUE,
9907 message
9908 ("Parameter %d (%s) to function %s is declared %s but "
9909 "may be aliased externally by parameter %d (%s)",
9910 paramno,
9911 exprNode_unparse (current),
9912 exprNode_unparse (fcn),
9913 alkind_unparse (uentry_getAliasKind (ucurrent)),
9914 iparamno, exprNode_unparse (icurrent)),
9915 current->loc);
9916 }
9917 }
9918 }
9919 }
9920 else
9921 {
9922 voptgenerror
9923 (FLG_ALIASUNIQUE,
9924 message
9925 ("Parameter %d (%s) to function %s is declared %s but "
9926 "is aliased externally by parameter %d (%s) through "
9927 "alias %q",
9928 paramno,
9929 exprNode_unparse (current),
9930 exprNode_unparse (fcn),
9931 alkind_unparse (uentry_getAliasKind (ucurrent)),
9932 iparamno, exprNode_unparse (icurrent),
9933 sRef_unparse (asr)),
9934 current->loc);
9935 }
9936 }
9937 } end_sRefSet_allElements;
9938 sRefSet_free (aliases);
9939 }
9940 }
9941 } end_exprNodeList_elements;
9942}
9943
a0a162cd 9944long exprNode_getLongValue (exprNode e) {
9945 long value;
885824d3 9946
a0a162cd 9947 if (exprNode_hasValue (e)
9948 && multiVal_isInt (exprNode_getValue (e)))
9949 {
9950 value = multiVal_forceInt (exprNode_getValue (e));
9951 }
9952 else
9953 {
9954 value = 0;
9955 }
9956
9957 return value;
9958}
4cccc6ad 9959
9960fileloc exprNode_getfileloc (exprNode p_e)
9961{
754746a0 9962 if (p_e)
9963 return fileloc_copy ( p_e->loc );
9964 else
9965 return fileloc_undefined;
4cccc6ad 9966}
9967
9968fileloc exprNode_getNextSequencePoint (exprNode e)
9969{
9970 /*
9971 ** Returns the location of the sequence point following e.
9972 **
9973 ** Only works for statements (for now).
9974 */
9975
9976 if (exprNode_isDefined (e) && e->kind == XPR_STMT) {
9977 lltok t = exprData_getUopTok (e->edata);
4cccc6ad 9978 return lltok_getLoc (t);
9979 } else {
754746a0 9980 #warning fix
9981 // llcontbug (message ("Cannot get next sequence point: %s", exprNode_unparse (e)));
4cccc6ad 9982 return fileloc_undefined;
9983 }
9984 }
9985
754746a0 9986
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