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[splint.git] / src / exprNode.c
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616915dd 1/*
11db3170 2** Splint - annotation-assisted static program checker
c59f5181 3** Copyright (C) 1994-2003 University of Virginia,
616915dd 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**
155af98d 20** For information on splint: info@splint.org
21** To report a bug: splint-bug@splint.org
11db3170 22** For more information: http://www.splint.org
616915dd 23*/
24/*
25** exprNode.c
26*/
27
28# include <ctype.h> /* for isdigit */
1b8ae690 29# include "splintMacros.nf"
616915dd 30# include "basic.h"
31# include "cgrammar.h"
6fcd0b1e 32# include "cscanner.h"
16c024b5 33# include "cscannerHelp.h"
616915dd 34# include "cgrammar_tokens.h"
35
36# include "exprChecks.h"
28bf4b0b 37# include "transferChecks.h"
616915dd 38# include "exprNodeSList.h"
616915dd 39
3e3ec469 40static bool exprNode_sameStorage (exprNode p_e1, exprNode p_e2) /*@*/ ;
616915dd 41static bool exprNode_isEmptyStatement (exprNode p_e);
42static /*@exposed@*/ exprNode exprNode_firstStatement (/*@returned@*/ exprNode p_e);
43static bool exprNode_isFalseConstant (exprNode p_e) /*@*/ ;
abd7f895 44static bool exprNode_isStatement (exprNode p_e);
616915dd 45static void checkGlobUse (uentry p_glob, bool p_isCall, /*@notnull@*/ exprNode p_e);
28bf4b0b 46static void exprNode_addUse (exprNode p_e, /*@exposed@*/ sRef p_s);
616915dd 47static bool exprNode_matchArgType (ctype p_ct, exprNode p_e);
28bf4b0b 48static exprNode exprNode_fakeCopy (exprNode p_e) /*@*/ ;
616915dd 49static exprNode exprNode_statementError (/*@only@*/ exprNode p_e, /*@only@*/ lltok p_t);
50static bool exprNode_matchTypes (exprNode p_e1, exprNode p_e2);
51static void checkUniqueParams (exprNode p_fcn,
52 /*@notnull@*/ exprNode p_current, exprNodeList p_args,
53 int p_paramno, uentry p_ucurrent);
54static void updateAliases (/*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2);
e5081f8c 55static bool abstractOpError (ctype p_tr1, ctype p_tr2, lltok p_op,
616915dd 56 /*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2,
e5081f8c 57 fileloc p_loc1, fileloc p_loc2)
58 /*@modifies g_warningstream@*/ ;
616915dd 59static ctype checkNumerics (ctype p_tr1, ctype p_tr2, ctype p_te1, ctype p_te2,
60 /*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2, lltok p_op);
61static void doAssign (/*@notnull@*/ exprNode p_e1, /*@notnull@*/ exprNode p_e2, bool p_isInit);
28bf4b0b 62static void checkSafeUse (exprNode p_e, /*@exposed@*/ sRef p_s);
616915dd 63static void reflectNullTest (/*@notnull@*/ exprNode p_e, bool p_isnull);
64static void checkMacroParen (exprNode p_e);
65static exprNodeSList exprNode_flatten (/*@dependent@*/ exprNode p_e);
66static void exprNode_checkSetAny (exprNode p_e, /*@dependent@*/ cstring p_name);
28bf4b0b 67static void exprNode_checkUse (exprNode p_e, /*@exposed@*/ sRef p_s, fileloc p_loc);
616915dd 68static void exprNode_mergeUSs (exprNode p_res, exprNode p_other);
69static void exprNode_mergeCondUSs (exprNode p_res, exprNode p_other1, exprNode p_other2);
70static /*@only@*/ /*@notnull@*/ exprNode exprNode_fromIdentifierAux (/*@observer@*/ uentry p_c);
71static void checkAnyCall (/*@notnull@*/ /*@dependent@*/ exprNode p_fcn,
72 /*@dependent@*/ cstring p_fname,
73 uentryList p_pn, exprNodeList p_args,
74 bool p_hasMods, sRefSet p_mods, bool p_isSpec,
75 int p_specialArgs);
76static void checkOneArg (uentry p_ucurrent, /*@notnull@*/ exprNode p_current,
77 /*@dependent@*/ exprNode p_fcn, bool p_isSpec, int p_argno, int p_totargs);
78static void
79 checkUnspecCall (/*@notnull@*/ /*@dependent@*/ exprNode p_fcn, uentryList p_params, exprNodeList p_args);
80
81static /*@only@*/ exprNode exprNode_effect (exprNode p_e)
82 /*@globals internalState@*/ ;
83static /*@only@*/ cstring exprNode_doUnparse (exprNode p_e);
84static /*@observer@*/ cstring exprNode_rootVarName (exprNode p_e);
85static /*@exposed@*/ exprNode
86 exprNode_lastStatement (/*@returned@*/ exprNode p_e);
87
02b84d4b 88static /*@only@*/ exprNode s_mustExitNode = exprNode_undefined;
616915dd 89
90static int checkArgsReal (uentry p_fcn, /*@dependent@*/ exprNode p_f,
91 uentryList p_cl,
92 exprNodeList p_args, bool p_isIter, exprNode p_ret);
93
94static bool inEffect = FALSE;
95static int nowalloc = 0;
96static int totalloc = 0;
97static int maxalloc = 0;
98
99static /*@only@*/ uentry regArg;
100static /*@only@*/ uentry outArg;
101static /*@only@*/ uentry outStringArg;
102static /*@exposed@*/ sRef stdinRef;
103static /*@exposed@*/ sRef stdoutRef;
104static /*@only@*/ uentry csArg;
105static /*@only@*/ uentry csOnlyArg;
106static ctype cstringType;
107static ctype ctypeType;
108static ctype filelocType;
109static bool initMod = FALSE;
110
ccf0a4a8 111/*@function void exprNode_swap (sef exprNode, sef exprNode)@*/
112/*@-macroassign@*/
113# define exprNode_swap(e1,e2) do { exprNode m_tmp = (e1); (e1) = (e2); (e2) = m_tmp; } while (FALSE)
114/*@=macroassign@*/
115
08eb3d0e 116static void exprNode_defineConstraints(/*@sef@*/ /*@special@*/ /*@notnull@*/ exprNode e)
117 /*@defines e->requiresConstraints, e->ensuresConstraints,
118 e->trueEnsuresConstraints, e->falseEnsuresConstraints @*/
119{
120 e->requiresConstraints = constraintList_makeNew ();
121 e->ensuresConstraints = constraintList_makeNew ();
122 e->trueEnsuresConstraints = constraintList_makeNew ();
123 e->falseEnsuresConstraints = constraintList_makeNew ();
124}
84c9ffbf 125
616915dd 126/*
127** must occur after library has been read
128*/
129
130void exprNode_initMod (void)
131 /*@globals undef regArg, undef outArg, undef outStringArg,
132 undef csOnlyArg, undef csArg;
133 @*/
134{
135 uentry ue;
136 idDecl tmp;
137
138 initMod = TRUE;
139 cstringType = ctype_unknown;
140 ctypeType = ctype_unknown;
141 filelocType = ctype_unknown;
142
616915dd 143 if (usymtab_existsType (cstring_makeLiteralTemp ("cstring")))
144 {
145 cstringType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("cstring"));
146 }
147
148 if (usymtab_existsType (cstring_makeLiteralTemp ("ctype")))
149 {
150 ctypeType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("ctype"));
151 }
152
153 if (usymtab_existsType (cstring_makeLiteralTemp ("fileloc")))
154 {
155 filelocType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("fileloc"));
156 }
157
158 if (usymtab_existsGlob (cstring_makeLiteralTemp ("stdin")))
159 {
160 ue = usymtab_lookupGlob (cstring_makeLiteralTemp ("stdin"));
161 }
162 else /* define stdin */
163 {
164 ue = uentry_makeVariable (cstring_makeLiteralTemp ("stdin"),
165 ctype_unknown,
166 fileloc_getBuiltin (),
167 FALSE);
168 uentry_setHasNameError (ue);
169 ue = usymtab_supGlobalEntryReturn (ue);
170 }
171
172 stdinRef = sRef_makePointer (uentry_getSref (ue));
173
174 if (usymtab_existsGlob (cstring_makeLiteralTemp ("stdout")))
175 {
176 ue = usymtab_lookupGlob (cstring_makeLiteralTemp ("stdout"));
177 }
178 else
179 {
180 ue = uentry_makeVariable (cstring_makeLiteralTemp ("stdout"),
181 ctype_unknown,
182 fileloc_getBuiltin (),
183 FALSE);
184 uentry_setHasNameError (ue);
185 ue = usymtab_supGlobalEntryReturn (ue);
186 }
187
188 stdoutRef = sRef_makePointer (uentry_getSref (ue));
189
190 tmp = idDecl_create (cstring_undefined, qtype_create (ctype_unknown));
191
192 regArg = uentry_makeParam (tmp, PARAMUNKNOWN);
193
194 idDecl_setTyp (tmp,
195 qtype_addQual (qtype_create (ctype_makePointer (ctype_unknown)),
196 qual_createOut ()));
197
198 outArg = uentry_makeParam (tmp, PARAMUNKNOWN);
199
200 idDecl_setTyp (tmp, qtype_addQual (qtype_create (ctype_string),
201 qual_createOut ()));
202
203 outStringArg = uentry_makeParam (tmp, PARAMUNKNOWN);
204
205 idDecl_setTyp (tmp, qtype_addQual (qtype_addQual (qtype_create (cstringType),
206 qual_createOnly ()),
207 qual_createNull ()));
208
209 csOnlyArg = uentry_makeParam (tmp, PARAMUNKNOWN);
210
211 idDecl_setTyp (tmp, qtype_addQual (qtype_create (cstringType), qual_createNull ()));
212 csArg = uentry_makeParam (tmp, PARAMUNKNOWN);
213
214 idDecl_free (tmp);
215}
216
217void
218exprNode_destroyMod (void)
219 /*@globals killed regArg, killed outArg, killed outStringArg,
02b84d4b 220 killed s_mustExitNode, initMod @*/
616915dd 221{
222 if (initMod)
223 {
6fcd0b1e 224 /* evans 2002-07-12: changed uentry_free to uentry_freeComplete */
225 uentry_freeComplete (regArg);
226 uentry_freeComplete (outArg);
227 uentry_freeComplete (outStringArg);
616915dd 228
02b84d4b 229 exprNode_free (s_mustExitNode);
616915dd 230 initMod = FALSE;
6fcd0b1e 231 /*@-branchstate@*/
616915dd 232 }
233 /*@=branchstate@*/
234}
235
236static void exprNode_resetSref (/*@notnull@*/ exprNode e)
237{
02b84d4b 238 e->sref = sRef_undefined;
616915dd 239}
240
28bf4b0b 241exprNode exprNode_fakeCopy (exprNode e)
242{
243 /*@-temptrans@*/ /*@-retalias@*/
244 return e;
245 /*@=temptrans@*/ /*@=retalias@*/
246}
247
616915dd 248static bool isFlagKey (char key)
249{
250 return (key == '-' || key == '+' || key == ' ' || key == '#');
251}
252
253static void exprNode_combineControl (/*@notnull@*/ exprNode ret,
254 /*@notnull@*/ exprNode ifclause,
255 /*@notnull@*/ exprNode elseclause)
256{
257 ret->canBreak = ifclause->canBreak || elseclause->canBreak;
258
259 ret->mustBreak =
260 (ifclause->mustBreak || exprNode_mustEscape (ifclause))
261 && (elseclause->mustBreak || exprNode_mustEscape (elseclause));
262
263 ret->exitCode = exitkind_combine (ifclause->exitCode,
264 elseclause->exitCode);
265
266}
267
268/*
269** For exprNode's returned by exprNode_effect.
270*/
271
272static bool shallowKind (exprKind kind)
273{
274 return (kind == XPR_STRINGLITERAL
275 || kind == XPR_NUMLIT
276 || kind == XPR_EMPTY
277 || kind == XPR_BODY
278 || kind == XPR_NODE);
279}
280
281static void
282exprNode_freeIniter (/*@only@*/ exprNode e)
283{
284 if (!exprNode_isError (e))
285 {
286 switch (e->kind)
287 {
288 case XPR_FACCESS:
28bf4b0b 289 /*
290 ** Its a fake copy, don't free the field->rec and field->field
291 ** fields.
292 */
293
294 /*@-compdestroy@*/
616915dd 295 sfree (e->edata->field);
28bf4b0b 296 /*@=compdestroy@*/
297
616915dd 298 sfree (e->edata);
299 break;
300 case XPR_FETCH:
301 exprNode_free (e->edata->op->b);
302 /*@-compdestroy@*/ sfree (e->edata->op); /*@=compdestroy@*/
303 sfree (e->edata);
304 break;
305 default:
306 llbug (message ("other: %s", exprNode_unparse (e)));
307 }
308
309 multiVal_free (e->val);
310 cstring_free (e->etext);
311 fileloc_free (e->loc);
312 sRefSet_free (e->uses);
313 sRefSet_free (e->sets);
314 sRefSet_free (e->msets);
315 guardSet_free (e->guards);
bb25bea6 316
317 constraintList_free(e->requiresConstraints);
318 constraintList_free(e->ensuresConstraints);
319 constraintList_free(e->trueEnsuresConstraints);
320 constraintList_free(e->falseEnsuresConstraints);
321
322 e->requiresConstraints = NULL;
323 e->ensuresConstraints = NULL;
324 e->trueEnsuresConstraints = NULL;
325 e->falseEnsuresConstraints = NULL;
326
616915dd 327 sfree (e);
328 }
329}
330
331void
332exprNode_freeShallow (/*@only@*/ exprNode e)
333{
334 if (!exprNode_isError (e))
335 {
336 if (shallowKind (e->kind))
337 {
338 }
339 else
340 {
341 if (!inEffect)
342 {
343 if (e->kind == XPR_EMPTY
344 || e->kind == XPR_BODY
345 || e->kind == XPR_STRINGLITERAL
346 || e->kind == XPR_NUMLIT
347 || e->kind == XPR_NODE
348 || e->kind == XPR_OFFSETOF
349 || e->kind == XPR_ALIGNOFT
350 || e->kind == XPR_ALIGNOF
351 || e->kind == XPR_SIZEOFT
352 || e->kind == XPR_SIZEOF)
353 {
354 /* don't free anything */
355 }
356 else
357 {
358 /* multiVal_free (e->val); */
359 cstring_free (e->etext);
360 fileloc_free (e->loc);
361 sRefSet_free (e->uses);
362 sRefSet_free (e->sets);
363 sRefSet_free (e->msets);
364 guardSet_free (e->guards);
365 exprData_freeShallow (e->edata, e->kind);
366 nowalloc--;
367 /*@-compdestroy@*/ sfree (e); /*@=compdestroy@*/
368 /*@-branchstate@*/
369 }
370 }
371 } /*@=branchstate@*/
372 }
373 }
374
375void
376exprNode_free (exprNode e)
377{
378 if (!exprNode_isError (e))
379 {
380 if (!inEffect)
381 {
382 multiVal_free (e->val);
383 cstring_free (e->etext);
384 fileloc_free (e->loc);
385 sRefSet_free (e->uses);
386 sRefSet_free (e->sets);
387 sRefSet_free (e->msets);
388 guardSet_free (e->guards);
389 exprData_free (e->edata, e->kind);
390
bb25bea6 391 constraintList_free(e->requiresConstraints);
392 constraintList_free(e->ensuresConstraints);
393 constraintList_free(e->trueEnsuresConstraints);
394 constraintList_free(e->falseEnsuresConstraints);
395
396 e->requiresConstraints = NULL;
397 e->ensuresConstraints = NULL;
398 e->trueEnsuresConstraints = NULL;
399 e->falseEnsuresConstraints = NULL;
400
616915dd 401 nowalloc--;
402 sfree (e);
403 /*@-branchstate@*/
404 } /*@=branchstate@*/
405 }
406}
407
408exprNode
409exprNode_makeError ()
410{
411 return exprNode_undefined;
412}
413
414static /*@out@*/ /*@only@*/ /*@notnull@*/ exprNode
415exprNode_new (void)
416{
417 exprNode ret = (exprNode) dmalloc (sizeof (*ret));
418 /* static int lastexpnodes = 0; */
419
420 nowalloc++;
421 totalloc++;
422
423 if (nowalloc > maxalloc)
424 {
425 maxalloc = nowalloc;
426 }
427
428 return ret;
429}
430
431static /*@notnull@*/ /*@special@*/ exprNode
432 exprNode_createPlain (ctype c)
433 /*@defines result@*/
28bf4b0b 434 /*@ensures isnull result->edata, result->loc, result->val, result->guards,
435 result->uses, result->sets, result->msets, result->etext @*/
616915dd 436 /*@*/
437{
438 exprNode e = exprNode_new ();
439
440 e->typ = c;
441 e->kind = XPR_EMPTY;
442 e->val = multiVal_undefined;
02b84d4b 443 e->sref = sRef_undefined;
616915dd 444 e->etext = cstring_undefined;
445 e->loc = fileloc_undefined;
446 e->guards = guardSet_undefined;
447 e->uses = sRefSet_undefined;
448 e->sets = sRefSet_undefined;
449 e->msets = sRefSet_undefined;
450 e->edata = exprData_undefined;
451 e->exitCode = XK_NEVERESCAPE;
452 e->canBreak = FALSE;
453 e->mustBreak = FALSE;
454 e->isJumpPoint = FALSE;
8ac07c2e 455
456 exprNode_defineConstraints(e);
457
616915dd 458 return (e);
459}
460
461/*@observer@*/ exprNode exprNode_makeMustExit (void)
462{
02b84d4b 463 if (exprNode_isUndefined (s_mustExitNode))
616915dd 464 {
02b84d4b 465 s_mustExitNode = exprNode_createPlain (ctype_unknown);
466 s_mustExitNode->exitCode = XK_MUSTEXIT;
616915dd 467 }
468
02b84d4b 469 return s_mustExitNode;
616915dd 470}
471
472
473static /*@notnull@*/ /*@special@*/ exprNode exprNode_create (ctype c)
474 /*@defines result@*/
475 /*@post:isnull result->edata, result->guards, result->val,
476 result->uses, result->sets, result->msets@*/
477 /*@*/
478{
479 exprNode e = exprNode_createPlain (c);
480 e->loc = fileloc_copy (g_currentloc);
481 return (e);
482}
483
484static /*@notnull@*/ /*@special@*/ exprNode exprNode_createUnknown (void)
485 /*@defines result@*/
486 /*@post:isnull result->edata, result->guards,
487 result->uses, result->sets, result->msets@*/
488 /*@*/
489{
490 return (exprNode_create (ctype_unknown));
491}
492
493static /*@notnull@*/ /*@special@*/ exprNode
494 exprNode_createLoc (ctype c, /*@keep@*/ fileloc loc)
495 /*@defines result@*/
496 /*@post:isnull result->edata, result->guards, result->val,
497 result->uses, result->sets, result->msets@*/
498 /*@*/
499{
500 exprNode e = exprNode_createPlain (c);
501 e->loc = loc;
502 return (e);
503}
504
505static void
506 exprNode_copySets (/*@special@*/ /*@notnull@*/ exprNode ret, exprNode e)
507 /*@defines ret->guards, ret->uses, ret->sets, ret->msets@*/
508{
509 if (exprNode_isDefined (e))
510 {
511 ret->guards = guardSet_copy (e->guards);
512 ret->uses = sRefSet_newCopy (e->uses);
513 ret->sets = sRefSet_newCopy (e->sets);
514 ret->msets = sRefSet_newCopy (e->msets);
515 }
516 else
517 {
518 ret->guards = guardSet_undefined;
519 ret->uses = sRefSet_undefined;
520 ret->sets = sRefSet_undefined;
521 ret->msets = sRefSet_undefined;
522 }
523}
524
525static /*@notnull@*/ /*@special@*/ exprNode
526 exprNode_createPartialLocCopy (exprNode e, /*@only@*/ fileloc loc)
527 /*@defines result@*/
528 /*@post:isnull result->edata, result->etext@*/
529 /*@*/
530{
531 exprNode ret = exprNode_new ();
532
533 if (exprNode_isError (e))
534 {
535 ret->typ = ctype_unknown;
536 ret->val = multiVal_undefined;
537 ret->loc = loc;
538 ret->guards = guardSet_undefined;
539 ret->uses = sRefSet_undefined;
540 ret->sets = sRefSet_undefined;
541 ret->msets = sRefSet_undefined;
542 }
543 else
544 {
545 ret->typ = e->typ;
546 ret->val = multiVal_copy (e->val);
547 ret->loc = loc;
548 ret->guards = guardSet_copy (e->guards);
549 ret->uses = sRefSet_newCopy (e->uses);
550 ret->sets = sRefSet_newCopy (e->sets);
551 ret->msets = sRefSet_newCopy (e->msets);
552 }
553
554 ret->kind = XPR_EMPTY;
02b84d4b 555 ret->sref = sRef_undefined;
616915dd 556 ret->etext = cstring_undefined;
557 ret->exitCode = XK_NEVERESCAPE;
558 ret->canBreak = FALSE;
559 ret->mustBreak = FALSE;
560 ret->isJumpPoint = FALSE;
561 ret->edata = exprData_undefined;
562
bb25bea6 563 exprNode_defineConstraints(ret);
564
616915dd 565 return (ret);
566}
567
568
569static /*@notnull@*/ /*@special@*/ exprNode
570 exprNode_createPartialCopy (exprNode e)
571 /*@defines result@*/
572 /*@post:isnull result->edata, result->etext@*/
573 /*@*/
574{
575 return (exprNode_createPartialLocCopy (e, fileloc_copy (exprNode_loc (e))));
576}
577
578static /*@notnull@*/ /*@special@*/ exprNode
579 exprNode_createPartialNVCopy (exprNode e)
580 /*@defines result@*/
581 /*@post:isnull result->edata, result->etext, result->val @*/
582 /*@*/
583{
584 exprNode ret = exprNode_new ();
585
586 if (exprNode_isError (e))
587 {
588 ret->typ = ctype_unknown;
589 ret->loc = fileloc_undefined;
590 ret->guards = guardSet_undefined;
591 ret->uses = sRefSet_undefined;
592 ret->sets = sRefSet_undefined;
593 ret->msets = sRefSet_undefined;
594 }
595 else
596 {
597 ret->typ = e->typ;
598 ret->loc = fileloc_copy (e->loc);
599 ret->guards = guardSet_copy (e->guards);
600 ret->uses = sRefSet_newCopy (e->uses);
601 ret->sets = sRefSet_newCopy (e->sets);
602 ret->msets = sRefSet_newCopy (e->msets);
603 }
604
605 ret->val = multiVal_undefined;
606 ret->kind = XPR_EMPTY;
02b84d4b 607 ret->sref = sRef_undefined;
616915dd 608 ret->etext = cstring_undefined;
609 ret->exitCode = XK_NEVERESCAPE;
610 ret->canBreak = FALSE;
611 ret->mustBreak = FALSE;
612 ret->isJumpPoint = FALSE;
613 ret->edata = exprData_undefined;
614
bb25bea6 615 exprNode_defineConstraints(ret);
616
616915dd 617 return (ret);
618}
619
620static /*@notnull@*/ /*@special@*/ exprNode
621 exprNode_createSemiCopy (exprNode e)
622 /*@defines result@*/
623 /*@post:isnull result->edata, result->etext, result->sets,
624 result->msets, result->uses, result->guards@*/
625 /*@*/
626{
627 if (exprNode_isError (e))
628 {
629 return exprNode_createPlain (ctype_unknown);
630 }
631 else
632 {
633 exprNode ret = exprNode_new ();
634
635 ret->typ = e->typ;
636 ret->val = multiVal_copy (e->val);
637 ret->loc = fileloc_copy (e->loc);
638 ret->guards = guardSet_undefined;
639 ret->uses = sRefSet_undefined;
640 ret->sets = sRefSet_undefined;
641 ret->msets = sRefSet_undefined;
642
643 ret->kind = XPR_EMPTY;
02b84d4b 644 ret->sref = sRef_undefined;
616915dd 645 ret->etext = cstring_undefined;
646 ret->exitCode = XK_NEVERESCAPE;
647 ret->canBreak = FALSE;
648 ret->mustBreak = FALSE;
649 ret->isJumpPoint = FALSE;
650 ret->edata = exprData_undefined;
651
bb25bea6 652 exprNode_defineConstraints(ret);
653
616915dd 654 return (ret);
655 }
656}
657
658bool
659exprNode_isNullValue (exprNode e)
660{
661 if (exprNode_isDefined (e))
662 {
663 multiVal m = exprNode_getValue (e);
664
665 if (multiVal_isInt (m))
666 {
667 return (multiVal_forceInt (m) == 0);
668 }
669 }
670
671 return FALSE;
672}
673
674static bool
675exprNode_isUnknownConstant (/*@notnull@*/ exprNode e)
676{
677 while (e->kind == XPR_PARENS)
678 {
679 e = exprData_getUopNode (e->edata);
1bd8c30f 680
681 if (!exprNode_isDefined (e))
682 {
683 return FALSE;
684 }
685
686 /* evans 2002-02-05: was llassert (exprNode_isDefined (e)); but this can fail */
616915dd 687 }
688
689 if (e->kind == XPR_CONST)
690 {
691 multiVal m = exprNode_getValue (e);
692
693 if (multiVal_isUnknown (m))
694 {
695 return TRUE;
696 }
697 }
698
699 return FALSE;
700}
701
702/*@only@*/ exprNode
703 exprNode_numLiteral (ctype c, /*@temp@*/ cstring t,
704 /*@only@*/ fileloc loc, long val)
705{
706 exprNode e = exprNode_createLoc (c, loc);
707
708 e->kind = XPR_NUMLIT;
709
710 llassert (multiVal_isUndefined (e->val));
711 e->val = multiVal_makeInt (val);
712 e->edata = exprData_makeLiteral (cstring_copy (t));
713
714 if (val == 0)
715 {
716 e->sref = sRef_makeUnknown ();
717 sRef_setDefNull (e->sref, e->loc);
718 }
719
720 DPRINTF (("Num lit: %s / %s", exprNode_unparse (e), ctype_unparse (exprNode_getType (e))));
721 return (e);
722}
723
724/*@only@*/ exprNode
725exprNode_charLiteral (char c, cstring text, /*@only@*/ fileloc loc)
726{
727 exprNode e = exprNode_createLoc (ctype_char, loc);
728
729 if (context_getFlag (FLG_CHARINTLITERAL))
730 {
731 e->typ = ctype_makeConj (ctype_char, ctype_int);
732 }
733
734 e->kind = XPR_NUMLIT;
735 e->val = multiVal_makeChar (c);
736
737 e->edata = exprData_makeLiteral (cstring_copy (text));
738 return (e);
739}
740
741/*@only@*/ exprNode
742exprNode_floatLiteral (double d, ctype ct, cstring text, /*@only@*/ fileloc loc)
743{
744 exprNode e = exprNode_createLoc (ct, loc);
745
746 e->kind = XPR_NUMLIT;
747 e->val = multiVal_makeDouble (d);
748 e->edata = exprData_makeLiteral (cstring_copy (text));
749 return (e);
750}
751
752multiVal exprNode_getValue (exprNode e)
753{
754 while (exprNode_isInParens (e)) {
755 if (e->edata != NULL) {
756 e = exprData_getUopNode (e->edata);
757 } else {
758 break;
759 }
760 }
761
762 if (exprNode_isDefined (e)) {
763 return e->val;
764 } else {
765 return multiVal_undefined;
766 }
767}
768
769/*@only@*/ exprNode
28bf4b0b 770exprNode_combineLiterals (exprNode e, exprNode rest)
771{
772 cstring ns;
773
774 /* Both must be string literals. */
775
776 if (exprNode_isUndefined (rest) || exprNode_isUndefined (e))
777 {
778 exprNode_free (rest);
779 return e;
780 }
781
782 if (!exprNode_isStringLiteral (e))
783 {
784 voptgenerror
785 (FLG_SYNTAX,
786 message ("Constant concatentation is ungrammatical: %s %s", exprNode_unparse (e),
787 exprNode_unparse (rest)),
788 e->loc);
789 exprNode_free (rest);
790 return e;
791 }
792
793 if (!exprNode_isStringLiteral (rest))
794 {
795 voptgenerror
796 (FLG_SYNTAX,
797 message ("Constant concatentation is ungrammatical: %s %s", exprNode_unparse (e), exprNode_unparse (rest)),
798 rest->loc);
799
800 exprNode_free (rest);
801 return e;
802 }
803
804 ns = cstring_concat (multiVal_forceString (exprNode_getValue (e)),
805 multiVal_forceString (exprNode_getValue (rest)));
806
807 multiVal_free (e->val);
808 exprData_free (e->edata, e->kind);
809 e->edata = exprData_makeLiteral (cstring_copy (ns));
810 e->val = multiVal_makeString (ns);
811 exprNode_free (rest);
812 return e;
813}
814
815/*@only@*/ exprNode
816exprNode_rawStringLiteral (/*@only@*/ cstring t, /*@only@*/ fileloc loc)
616915dd 817{
818 exprNode e = exprNode_createLoc (ctype_string, loc);
abd7f895 819 size_t len = cstring_length (t);
616915dd 820
821 if (context_getFlag (FLG_STRINGLITERALLEN))
822 {
abd7f895 823 if (len > size_fromInt (context_getValue (FLG_STRINGLITERALLEN)))
616915dd 824 {
825 voptgenerror (FLG_STRINGLITERALLEN,
826 message
827 ("String literal length (%d) exceeds maximum "
28bf4b0b 828 "length (%d): \"%s\"",
abd7f895 829 size_toInt (len),
616915dd 830 context_getValue (FLG_STRINGLITERALLEN),
831 t),
832 e->loc);
833 }
834 }
835
616915dd 836 e->kind = XPR_STRINGLITERAL;
28bf4b0b 837 e->val = multiVal_makeString (cstring_copy (t));
616915dd 838 e->edata = exprData_makeLiteral (t);
12f2ffe9 839 e->sref = sRef_makeConst (ctype_string);
616915dd 840
841 if (context_getFlag (FLG_READONLYSTRINGS))
842 {
843 sRef_setAliasKind (e->sref, AK_STATIC, fileloc_undefined);
844 sRef_setExKind (e->sref, XO_OBSERVER, loc);
845 }
846 else
847 {
848 sRef_setAliasKind (e->sref, AK_ERROR, fileloc_undefined);
849 }
850
851 return (e); /* s released */
852}
853
e0b363ad 854/*@only@*/ exprNode
855exprNode_wideStringLiteral (/*@only@*/ cstring t, /*@only@*/ fileloc loc)
856{
857 exprNode res = exprNode_stringLiteral (t, loc);
858 res->typ = ctype_makeWideString ();
e0b363ad 859 return res;
860}
861
28bf4b0b 862/*@only@*/ exprNode
863exprNode_stringLiteral (/*@only@*/ cstring t, /*@only@*/ fileloc loc)
864{
e5081f8c 865 size_t len = size_fromInt (size_toInt (cstring_length (t)) - 2);
28bf4b0b 866 char *ts = cstring_toCharsSafe (t);
867 char *s = cstring_toCharsSafe (cstring_create (len + 1));
868
869 llassert (*ts == '\"' && *(ts + len + 1) == '\"');
abd7f895 870 strncpy (s, ts+1, len);
28bf4b0b 871 *(s + len) = '\0';
872 cstring_free (t);
873 return exprNode_rawStringLiteral (cstring_fromCharsO (s), loc);
874}
875
616915dd 876exprNode exprNode_fromUIO (cstring c)
877{
878 fileloc loc = context_getSaveLocation ();
879 exprNode e = exprNode_createPlain (ctype_unknown);
880
881 e->kind = XPR_VAR;
882
883 if (fileloc_isUndefined (loc))
884 {
885 loc = fileloc_copy (g_currentloc);
886 }
887
888 e->loc = loc; /* save loc was mangled */
02b84d4b 889 e->sref = sRef_undefined;
616915dd 890
891 if (usymtab_exists (c))
892 {
893 uentry ue = usymtab_lookupEither (c);
894
895 if (uentry_isDatatype (ue)
896 && uentry_isSpecified (ue))
897 {
898 llfatalerror
899 (message ("%q: Specified datatype %s used in code, but not defined. "
900 "(Cannot continue reasonably from this error.)",
901 fileloc_unparse (e->loc), c));
902 }
903 else
904 {
905 BADBRANCH;
906 }
907 }
908
909 llassertprint (!usymtab_exists (c), ("Entry exists: %s", c));
910
911 /*
912 ** was supercedeGlobalEntry...is this better?
913 */
914
915 if (!context_inIterEnd ())
916 {
917 if (context_inMacro ())
918 {
919 if (context_getFlag (FLG_UNRECOG))
920 {
921 voptgenerror
922 (FLG_MACROUNDEF,
923 message ("Unrecognized identifier in macro definition: %s", c), e->loc);
924 }
925 else
926 {
927 flagcode_recordSuppressed (FLG_UNRECOG);
928 }
929 }
930 else
931 {
932 voptgenerror
28bf4b0b 933 (FLG_UNRECOG, message ("Unrecognized identifier: %s", c), e->loc);
616915dd 934 }
935 }
936
937 e->edata = exprData_makeId (uentry_makeUnrecognized (c, fileloc_copy (loc)));
938
939 /* No alias errors for unrecognized identifiers */
940 sRef_setAliasKind (e->sref, AK_ERROR, loc);
941
942 return (e);
943}
944
5c2f3045 945exprNode exprNode_makeConstantString (cstring c, /*@only@*/ fileloc loc)
946{
947 exprNode e = exprNode_createPlain (ctype_unknown);
948 e->kind = XPR_VAR;
949 e->loc = loc;
950 e->sref = sRef_makeConst (ctype_string);
951 e->edata = exprData_makeId (uentry_makeUnrecognized (c, fileloc_copy (loc)));
952 e->typ = ctype_string;
a956d444 953
5c2f3045 954 /* No alias errors for unrecognized identifiers */
955 sRef_setAliasKind (e->sref, AK_STATIC, loc);
956 sRef_setExKind (e->sref, XO_OBSERVER, loc);
957
958 return (e);
959}
960
616915dd 961exprNode exprNode_createId (/*@observer@*/ uentry c)
962{
963 if (uentry_isValid (c))
964 {
965 exprNode e = exprNode_new ();
a956d444 966
967 DPRINTF (("create id: %s", uentry_unparse (c)));
968
616915dd 969 e->typ = uentry_getType (c);
970
971 if (uentry_isFunction (c)
972 && !sRef_isLocalVar (uentry_getSref (c)))
973 {
974 e->sref = sRef_undefined;
975 }
976 else
977 {
978 e->sref = uentry_getSref (c);
979 }
980
981 if (sRef_isStateUnknown (e->sref) && uentry_isNonLocal (c))
982 {
983 sRef_setDefined (e->sref, fileloc_undefined);
984 }
985
986 /*
987 ** yoikes! leaving this out was a heinous bug...that would have been
1b8ae690 988 ** caught if i had splint working first. gag!
616915dd 989 */
990
991 e->etext = cstring_undefined;
992
993 if (uentry_isEitherConstant (c))
994 {
995 e->kind = XPR_CONST;
996 e->val = multiVal_copy (uentry_getConstantValue (c));
997 }
998 else
999 {
1000 e->kind = XPR_VAR;
1001 e->val = multiVal_unknown ();
1002 }
1003
1004 e->edata = exprData_makeId (c);
1005 e->loc = context_getSaveLocation ();
1006
1007 if (fileloc_isUndefined (e->loc))
1008 {
1009 fileloc_free (e->loc);
1010 e->loc = fileloc_copy (g_currentloc);
1011 }
1012
1013 e->guards = guardSet_new ();
10fac4bc 1014
616915dd 1015 e->sets = sRefSet_new ();
1016 e->msets = sRefSet_new ();
1017 e->uses = sRefSet_new ();
1018
1b8ae690 1019 /*> missing fields, detected by splint <*/
616915dd 1020 e->exitCode = XK_NEVERESCAPE;
1021 e->isJumpPoint = FALSE;
1022 e->canBreak = FALSE;
1023 e->mustBreak = FALSE;
1024
02b84d4b 1025 exprNode_defineConstraints (e);
616915dd 1026 return e;
1027 }
1028 else
1029 {
28bf4b0b 1030 return exprNode_createUnknown ();
616915dd 1031 }
1032}
1033
1034/*@notnull@*/ exprNode
1035exprNode_fromIdentifier (/*@observer@*/ uentry c)
1036{
1037 exprNode ret;
1038
1039 if (context_justPopped ()) /* watch out! c could be dead */
1040 {
16c024b5 1041 uentry ce = usymtab_lookupSafe (cscannerHelp_observeLastIdentifier ());
616915dd 1042
1043 if (uentry_isValid (ce))
1044 {
1045 c = ce;
1046 }
1047 else
1048 {
1049 llbuglit ("Looks like Aunt Millie forgot to walk to dog again.");
1050 }
1051 }
1052
1053 ret = exprNode_fromIdentifierAux (c);
616915dd 1054 return ret;
1055}
1056
7534721d 1057static void exprNode_checkStringLiteralLength (ctype t1, exprNode e2)
1058{
1059 multiVal mval = exprNode_getValue (e2);
1060 cstring slit;
37ae0b5e 1061 size_t len;
7534721d 1062
1063 if (ctype_isFixedArray (t1))
1064 {
37ae0b5e 1065 size_t nelements = ctype_getArraySize (t1);
7534721d 1066
1067 llassert (multiVal_isString (mval));
1068 slit = multiVal_forceString (mval);
1810fe2a 1069
1070 len = cstring_lengthExpandEscapes (slit);
1071
abd7f895 1072 llassert (exprNode_isDefined (e2));
1073
7534721d 1074 if (len == nelements)
1075 {
1810fe2a 1076 mstring temp;
1077
abd7f895 1078 temp = cstring_expandEscapes (slit);
1810fe2a 1079
1080 if (temp[len-1] == '\0')
1081 {
1082 voptgenerror
1083 (FLG_STRINGLITNOROOMFINALNULL,
1084 message ("String literal with %d character%& "
1085 "is assigned to %s (no room for final null terminator): %s",
e5081f8c 1086 size_toInt (len + 1),
1810fe2a 1087 ctype_unparse (t1),
1088 exprNode_unparse (e2)),
1089 e2->loc);
1090 }
1091 else
1092 {
abd7f895 1093 voptgenerror
1094 (FLG_STRINGLITNOROOM,
1095 message ("String literal with %d character%& "
1096 "is assigned to %s (no room for null terminator): %s",
e5081f8c 1097 size_toInt (len + 1),
abd7f895 1098 ctype_unparse (t1),
1099 exprNode_unparse (e2)),
1100 e2->loc);
1810fe2a 1101 }
7534721d 1102 }
1103 else if (len > nelements)
1104 {
1105 voptgenerror
1106 (FLG_STRINGLITTOOLONG,
1810fe2a 1107 message ("String literal with %d character%& (counting null terminator) "
7534721d 1108 "is assigned to %s (insufficient storage available): %s",
e5081f8c 1109 size_toInt (len + 1),
7534721d 1110 ctype_unparse (t1),
1111 exprNode_unparse (e2)),
1112 e2->loc);
1113 }
1114 else if (len < nelements - 1)
1115 {
1116 voptgenerror
1117 (FLG_STRINGLITSMALLER,
1118 message ("String literal with %d character%& is assigned to %s (possible waste of storage): %s",
e5081f8c 1119 size_toInt (len + 1),
7534721d 1120 ctype_unparse (t1),
1121 exprNode_unparse (e2)),
1122 e2->loc);
1123 }
1124 else
1125 {
1126 ; /* okay */
1127 }
1128 }
1129}
1130
616915dd 1131static /*@only@*/ /*@notnull@*/ exprNode
1132exprNode_fromIdentifierAux (/*@observer@*/ uentry c)
1133{
1134 exprNode e = exprNode_createId (c);
1135 sRef sr = e->sref;
1136
1137 uentry_setUsed (c, e->loc);
1138
28bf4b0b 1139 if (uentry_isVar (c) && sRef_isFileOrGlobalScope (sr))
616915dd 1140 {
1141 checkGlobUse (c, FALSE, e);
1142 }
1143
1144 return (e);
1145}
1146
1147static bool
1148exprNode_isZero (exprNode e)
1149{
1150 if (exprNode_isDefined (e))
1151 {
1152 multiVal m = exprNode_getValue (e);
1153
1154 if (multiVal_isInt (m))
1155 {
1156 return (multiVal_forceInt (m) == 0);
1157 }
1158 }
1159
1160 return FALSE;
1161}
1162
1163static bool
1164exprNode_isNonNegative (exprNode e)
1165{
1166 if (exprNode_isDefined (e))
1167 {
1168 multiVal m = exprNode_getValue (e);
1169
1170 if (multiVal_isInt (m))
1171 {
1172 return (multiVal_forceInt (m) >= 0);
1173 }
a956d444 1174
1175 /*
1176 ** This is not always true if programmer defines enum
1177 ** values, but then the constant should be known.
1178 */
1179
1180 if (ctype_isEnum (ctype_realType (e->typ)))
1181 {
1182 return TRUE;
1183 }
616915dd 1184 }
1185
1186 return FALSE;
1187}
1188
1189/*
1190** a[x] - uses a but NOT a[]
1191** result sref = a[] (set/use in assignment)
1192**
1193** The syntax x[a] is also legal in C, and has the same
1194** semantics. If ind is an array, and arr is an int, flip
1195** the arguments.
1196*/
1197
1198/*@only@*/ exprNode
1199exprNode_arrayFetch (/*@only@*/ exprNode e1, /*@only@*/ exprNode e2)
1200{
1201 /*
1202 ** error in arr, error propagates (no new messages)
1203 ** error in ind, assume valid and continue
1204 */
1205
68de3f33 1206 DPRINTF (("Array fetch: %s / %s",
1207 exprNode_unparse (e1), exprNode_unparse (e2)));
1208
616915dd 1209 if (exprNode_isError (e1))
1210 {
1211 exprNode_free (e2);
1212 return (exprNode_makeError ());
1213 }
1214 else
1215 {
1216 exprNode arr;
1217 exprNode ind;
1218 ctype carr = exprNode_getType (e1);
1219 ctype crarr = ctype_realType (carr);
1220
1221 /*
1222 ** this sets up funny aliasing, that leads to spurious
1b8ae690 1223 ** splint errors. Hence, the i2 comments.
616915dd 1224 */
1225
68de3f33 1226 /* evans 2001-09-09 added ctype_isKnown so there is no swap when e1 type is unknown */
1227 if (ctype_isKnown (crarr)
1228 && !ctype_isRealArray (crarr)
616915dd 1229 && ctype_isRealNumeric (crarr)
1230 && !exprNode_isError (e2)
1231 && ctype_isRealAP (exprNode_getType (e2))) /* fetch like 3[a] */
1232 {
1233 arr = e2;
1234 ind = e1;
1235
1236 carr = exprNode_getType (arr);
1237 crarr = ctype_realType (carr);
1238 }
1239 else
1240 {
1241 arr = e1;
1242 ind = e2;
1243 }
1244
68de3f33 1245 DPRINTF (("arr: %s", exprNode_unparse (arr)));
1246
616915dd 1247 if (sRef_possiblyNull (arr->sref))
1248 {
1249 if (!usymtab_isGuarded (arr->sref))
1250 {
edad9a7f 1251 if (!context_inSizeof() )
616915dd 1252 {
edad9a7f 1253 if (optgenerror (FLG_NULLDEREF,
1254 message ("Index of %s pointer %q: %s",
1255 sRef_nullMessage (arr->sref),
1256 sRef_unparse (arr->sref),
1257 exprNode_unparse (arr)),
1258 arr->loc))
1259 {
1260 DPRINTF (("ref: %s", sRef_unparseFull (arr->sref)));
1261 sRef_showNullInfo (arr->sref);
1262
1263 /* suppress future messages */
1264 sRef_setNullError (arr->sref);
1265 }
616915dd 1266 }
1267 }
1268 }
1269
1270 if (exprNode_isError (ind))
1271 {
1272 if ((ctype_isArrayPtr (crarr)
1273 && !ctype_isFunction (crarr))
1274 || ctype_isUnknown (carr))
1275 {
1276 exprNode ret = exprNode_createPartialCopy (arr);
1277
1278 if (ctype_isKnown (carr))
1279 {
1280 ret->typ = ctype_baseArrayPtr (crarr);
1281 }
1282 else
1283 {
1284 ret->typ = ctype_unknown;
1285 }
1286
1287 ret->sref = sRef_makeArrayFetch (arr->sref);
1288
1289 ret->kind = XPR_FETCH;
1290
1291 /*
1292 ** Because of funny aliasing (when arr and ind are
1293 ** flipped) spurious errors would be reported here.
1294 */
1295
1296 /*@i2@*/ ret->edata = exprData_makePair (arr, ind);
1297 checkSafeUse (ret, arr->sref);
1298 return (ret);
1299 }
1300 else
1301 {
1302 voptgenerror (FLG_TYPE,
1303 message ("Array fetch from non-array (%t): %s[%s]", carr,
1304 exprNode_unparse (e1), exprNode_unparse (e2)),
1305 arr->loc);
1306 exprNode_free (arr);
1307 return (exprNode_makeError ());
1308 }
1309 }
1310 else
1311 {
1312 if (!ctype_isForceRealInt (&(ind->typ)))
1313 {
1314 ctype rt = ctype_realType (ind->typ);
1315
1316 if (ctype_isChar (rt))
1317 {
1318 vnoptgenerror
1319 (FLG_CHARINDEX,
1320 message ("Array fetch using non-integer, %t: %s[%s]",
1321 ind->typ,
1322 exprNode_unparse (e1), exprNode_unparse (e2)),
1323 arr->loc);
1324 }
1325 else if (ctype_isEnum (rt))
1326 {
1327 vnoptgenerror
1328 (FLG_ENUMINDEX,
1329 message ("Array fetch using non-integer, %t: %s[%s]",
1330 ind->typ,
1331 exprNode_unparse (e1), exprNode_unparse (e2)),
1332 arr->loc);
1333 }
b73d1009 1334 else if (ctype_isNumAbstract (rt))
1335 {
1336 vnoptgenerror
1337 (FLG_NUMABSTRACTINDEX,
1338 message ("Array fetch using numabstract type, %t: %s[%s]",
1339 ind->typ,
1340 exprNode_unparse (e1), exprNode_unparse (e2)),
1341 arr->loc);
1342 }
616915dd 1343 else
1344 {
1345 voptgenerror
1346 (FLG_TYPE,
1347 message ("Array fetch using non-integer, %t: %s[%s]",
1348 ind->typ,
1349 exprNode_unparse (e1), exprNode_unparse (e2)),
1350 arr->loc);
1351 }
1352
1353 multiVal_free (ind->val);
1354 ind->val = multiVal_unknown ();
1355 }
1356
1357 if (ctype_isArrayPtr (crarr) && !ctype_isFunction (crarr))
1358 {
1359 exprNode ret = exprNode_createSemiCopy (arr);
1360 multiVal m = exprNode_getValue (ind);
1361
1362 ret->typ = ctype_baseArrayPtr (crarr);
1363 ret->kind = XPR_FETCH;
1364
1365 if (multiVal_isInt (m))
1366 {
1367 int i = (int) multiVal_forceInt (m);
1368
1369 if (sRef_isValid (arr->sref)) {
1370 ret->sref = sRef_makeArrayFetchKnown (arr->sref, i);
1371 } else {
1372 ret->sref = sRef_undefined;
1373 }
1374 }
1375 else
1376 {
28bf4b0b 1377 ret->sref = sRef_makeArrayFetch (arr->sref);
616915dd 1378 }
1379
1380 ret->sets = sRefSet_realNewUnion (arr->sets, ind->sets);
1381 ret->msets = sRefSet_realNewUnion (arr->msets, ind->msets);
1382 ret->uses = sRefSet_realNewUnion (arr->uses, ind->uses);
1383
1384 /* (see comment on spurious errors above) */
1385 /*@i2@*/ ret->edata = exprData_makePair (arr, ind);
1386
1387 exprNode_checkUse (ret, ind->sref, ind->loc);
1388 exprNode_checkUse (ret, arr->sref, arr->loc);
1389
1390 return (ret);
1391 }
1392 else
1393 {
1394 if (ctype_isUnknown (carr))
1395 {
1396 exprNode ret = exprNode_createPartialCopy (arr);
1397
1398 ret->kind = XPR_FETCH;
1399 ret->typ = ctype_unknown;
1400 ret->sets = sRefSet_union (ret->sets, ind->sets);
1401 ret->msets = sRefSet_union (ret->msets, ind->msets);
1402 ret->uses = sRefSet_union (ret->uses, ind->uses);
1403
1404 /* (see comment on spurious errors above) */
1405 /*@i2@*/ ret->edata = exprData_makePair (arr, ind);
1406
1407 exprNode_checkUse (ret, ind->sref, ind->loc);
1408 exprNode_checkUse (ret, arr->sref, arr->loc);
1409 return (ret);
1410 }
1411 else
1412 {
1413 voptgenerror
1414 (FLG_TYPE,
1415 message ("Array fetch from non-array (%t): %s[%s]", carr,
1416 exprNode_unparse (e1), exprNode_unparse (e2)),
1417 arr->loc);
1418
1419 exprNode_free (arr);
1420 exprNode_free (ind);
1421
1422 return (exprNode_makeError ());
1423 }
1424 }
1425 }
1426 }
1427 BADEXIT;
1428}
1429
1430
1431static int
1432checkArgs (uentry fcn, /*@dependent@*/ exprNode f, ctype t,
1433 exprNodeList args, exprNode ret)
1434{
1435 return (checkArgsReal (fcn, f, ctype_argsFunction (t), args, FALSE, ret));
1436}
1437
1438/*
1439** checkPrintfArgs --- checks arguments for printf-like functions
1440** Arguments before ... have already been checked.
1441** The argument before the ... is a char *.
1442** argno is the format string argument.
1443*/
1444
1445static void
1446checkPrintfArgs (/*@notnull@*/ /*@dependent@*/ exprNode f, uentry fcn,
1447 exprNodeList args, exprNode ret, int argno)
1448{
1449 /*
1450 ** the last argument before the elips is the format string
1451 */
1452
1453 int i = argno;
1454 fileloc formatloc;
1455 int nargs = exprNodeList_size (args);
1456 uentryList params = uentry_getParams (fcn);
1457 exprNode a;
1458
1459 /*
1460 ** These should be ensured by checkSpecialFunction
1461 */
1462
1463 llassert (uentryList_size (params) == argno + 1);
1464 llassert (uentry_isElipsisMarker (uentryList_getN (params, argno)));
1465
1466 a = exprNodeList_getN (args, argno - 1);
1467 formatloc = fileloc_copy (exprNode_loc (a));
1468
1469 if (exprNode_isDefined (a) && exprNode_isStringLiteral (a)
1470 && exprNode_knownStringValue (a))
1471 {
1472 char *format = cstring_toCharsSafe (multiVal_forceString (exprNode_getValue (a)));
1473 char *code = format;
1474 char *ocode = code;
1475
1476 nargs = exprNodeList_size (args);
1477
1478 while ((code = strchr (code, '%')) != NULL)
1479 {
1480 char *origcode = code;
28bf4b0b 1481 cstring codetext = cstring_newEmpty ();
616915dd 1482 char key = *(++code);
1483 ctype modtype = ctype_int;
1484 bool modified = FALSE;
1485
1486 fileloc_addColumn (formatloc, code - ocode);
1487
28bf4b0b 1488 codetext = cstring_appendChar (codetext, key);
1489
616915dd 1490 /* ignore flags */
1491 while (isFlagKey (key))
1492 {
1493 key = *(++code);
28bf4b0b 1494 codetext = cstring_appendChar (codetext, key);
616915dd 1495 fileloc_incColumn (formatloc);
1496 }
1497
1498 if (key == 'm') /* skipped in syslog */
1499 {
1500 continue;
1501 }
1502
1503 /* ignore field width */
1504 while (isdigit ((int) key) != 0)
1505 {
1506 key = *(++code);
28bf4b0b 1507 codetext = cstring_appendChar (codetext, key);
616915dd 1508 fileloc_incColumn (formatloc);
1509 }
1510
1511 /* ignore precision */
1512 if (key == '.')
1513 {
1514 key = *(++code);
28bf4b0b 1515 codetext = cstring_appendChar (codetext, key);
616915dd 1516 fileloc_incColumn (formatloc);
1517
1518 /*
1519 ** In printf, '*' means: read the next arg as an int for the
1520 ** field width. This seems to be missing from my copy of the
1521 ** standard x3.159-1989. Setion 4.9.6.1 refers to * (described
1522 ** later) but never does.
1523 */
1524
1525 if (key == '*')
1526 {
1527 ; /* don't do anything --- handle later */
1528 }
1529 else
1530 {
1531 while (isdigit ((int) key) != 0)
1532 {
1533 key = *(++code);
28bf4b0b 1534 codetext = cstring_appendChar (codetext, key);
616915dd 1535 fileloc_incColumn (formatloc);
1536 }
1537 }
1538 }
1539
1540 if (key == 'h')
1541 {
1542 modtype = ctype_sint; /* short */
1543 key = *(++code);
28bf4b0b 1544 codetext = cstring_appendChar (codetext, key);
616915dd 1545 fileloc_incColumn (formatloc);
1546 }
1547 else if (key == 'l' || key == 'L')
1548 {
1549 modtype = ctype_lint; /* long */
1550 key = *(++code);
28bf4b0b 1551 codetext = cstring_appendChar (codetext, key);
616915dd 1552 fileloc_incColumn (formatloc);
1553
1554 if (key == 'l' || key == 'L') {
1555 modtype = ctype_llint; /* long long */
1556 key = *(++code);
28bf4b0b 1557 codetext = cstring_appendChar (codetext, key);
616915dd 1558 fileloc_incColumn (formatloc);
1559 }
1560 }
1561 else
1562 {
1563 ; /* no modifier */
1564 }
1565
1566 /* now, key = type of conversion to apply */
1567 ++code;
1568 fileloc_incColumn (formatloc);
1569
1570 if (key != '%')
1571 {
1572 if (i >= nargs)
1573 {
1574 if (optgenerror
1575 (FLG_TYPE,
1576 message ("No argument corresponding to %q format "
28bf4b0b 1577 "code %d (%%%s): \"%s\"",
616915dd 1578 uentry_getName (fcn),
28bf4b0b 1579 i, codetext,
616915dd 1580 cstring_fromChars (format)),
1581 f->loc))
1582 {
1583 if (fileloc_isDefined (formatloc)
1584 && context_getFlag (FLG_SHOWCOL))
1585 {
1586 llgenindentmsg (cstring_makeLiteral ("Corresponding format code"),
1587 formatloc);
1588 }
1589 }
1590 i++;
1591 }
1592 else
1593 {
1594 a = exprNodeList_getN (args, i);
1595 i++;
1596
1597 if (!exprNode_isError (a))
1598 {
1599 ctype expecttype;
1600
1601 switch (key)
1602 {
1603 case '*': /* int argument for fieldwidth */
1604 expecttype = ctype_int;
1605 *(--code) = '%'; /* convert it for next code */
1606 fileloc_subColumn (formatloc, 1);
1607 /*@switchbreak@*/ break;
1608 case 'u':
1609 case 'o':
1610 expecttype = ctype_combine (ctype_uint, modtype);
1611 /*@switchbreak@*/ break;
1612
1613 case 'i': /* int argument */
1614 case 'd':
1615 expecttype = ctype_combine (ctype_int, modtype);
1616 /*@switchbreak@*/ break;
1617
28bf4b0b 1618 case 'x': /* unsigned int */
616915dd 1619 case 'X':
28bf4b0b 1620 expecttype = ctype_combine (ctype_uint, modtype);
1621
616915dd 1622 /*@switchbreak@*/ break;
1623
1624 case 'e':
1625 case 'E':
1626 case 'g':
1627 case 'G':
1628 case 'f': /* double */
1629 expecttype = ctype_combine (ctype_double, modtype);
1630 /*@switchbreak@*/ break;
1631
1632 case 'c': /* int converted to char (check its a char?) */
2209bcb7 1633 expecttype = ctype_makeConj (ctype_int,
1634 ctype_makeConj (ctype_char,
1635 ctype_uchar));
2209bcb7 1636 /* evans 2001-10-05 - changed to reflect correct ISO spec:
1637 int converted to char */
1638
616915dd 1639 /*@switchbreak@*/ break;
1640
1641 case 's': /* string */
1642 expecttype = ctype_string;
1643 /*@switchbreak@*/ break;
1644 case '[':
1645 /* skip to ']' */
1646 while (((key = *(++code)) != ']')
1647 && (key != '\0'))
1648 {
28bf4b0b 1649 codetext = cstring_appendChar (codetext, key);
616915dd 1650 fileloc_incColumn (formatloc);
1651 }
1652
1653 if (key == '\0')
1654 {
1655 llfatalerrorLoc
1656 (message ("Bad character set format: %s",
1657 cstring_fromChars (origcode)));
1658 }
1659
1660 expecttype = ctype_string;
1661 /*@switchbreak@*/ break;
1662
1663 case 'p': /* pointer */
1664 expecttype = ctype_makePointer (ctype_void);
393e573f 1665 /* need not be defined */
1666 uentry_setDefState (regArg, SS_RELDEF);
1667 sRef_setPosNull (uentry_getSref (regArg),
1668 fileloc_undefined);
1669 /* could be null */
616915dd 1670 /*@switchbreak@*/ break;
1671
1672 case 'n': /* pointer to int, modified by call! */
1673 expecttype = ctype_combine (ctype_makePointer (ctype_int), modtype);
1674 modified = TRUE;
1675 uentry_setDefState (regArg, SS_ALLOCATED); /* corresponds to out */
1676 /*@switchbreak@*/ break;
1677
1678 case 'm': /* in a syslog, it doesn't consume an argument */
1679 /* should check we're really doing syslog */
1680
1681 /*@switchbreak@*/ break;
1682
1683
1684 default:
1685 expecttype = ctype_unknown;
1686
1687 voptgenerror
1688 (FLG_FORMATCODE,
1689 message ("Unrecognized format code: %s",
1690 cstring_fromChars (origcode)),
1691 fileloc_isDefined (formatloc)
1692 ? formatloc : g_currentloc);
1693
1694 /*@switchbreak@*/ break;
1695 }
1696
1697 if (!(exprNode_matchArgType (expecttype, a)))
1698 {
1699 if (ctype_isVoidPointer (expecttype)
1700 && ctype_isRealAbstract (a->typ)
1701 && (context_getFlag (FLG_ABSTVOIDP)))
1702 {
1703 ;
1704 }
1705 else
1706 {
1707 if (llgenformattypeerror
1708 (expecttype, exprNode_undefined,
1709 a->typ, a,
28bf4b0b 1710 message ("Format argument %d to %q (%%%s) expects "
616915dd 1711 "%t gets %t: %s",
1712 i - argno,
1713 uentry_getName (fcn),
28bf4b0b 1714 codetext,
1715 expecttype,
616915dd 1716 a->typ, exprNode_unparse (a)),
1717 a->loc))
1718 {
1719 if (fileloc_isDefined (formatloc)
1720 && context_getFlag (FLG_SHOWCOL))
1721 {
1722 llgenindentmsg
1723 (cstring_makeLiteral
1724 ("Corresponding format code"),
1725 formatloc);
1726 }
1727 }
1728 }
1729 }
1730
1731 uentry_setType (regArg, expecttype);
1732 checkOneArg (regArg, a, f, FALSE, i+1, nargs);
1733
1734 if (ctype_equal (expecttype, ctype_string))
1735 {
1736 exprNode_checkUse (a, sRef_makePointer (a->sref), a->loc);
1737 }
1738
1739 uentry_setType (regArg, ctype_unknown);
1740 uentry_fixupSref (regArg);
346fab44 1741
616915dd 1742 if (modified)
1743 {
1744 exprNode_checkCallModifyVal (a->sref, args, f, ret);
1745 }
1746 }
1747 else
1748 {
1749 ;
1750 }
1751 }
1752 }
28bf4b0b 1753
616915dd 1754 ocode = code;
28bf4b0b 1755 cstring_free (codetext);
616915dd 1756 }
1757
1758 if (i < nargs)
1759 {
1760 voptgenerror (FLG_TYPE,
28bf4b0b 1761 message ("Format string for %q has %d arg%&, given %d",
616915dd 1762 uentry_getName (fcn), i - argno, nargs - argno),
1763 f->loc);
1764 }
1765 }
1766 else
1767 {
1768 /* no checking possible for compile-time unknown format strings */
28bf4b0b 1769 if (exprNode_isDefined (a))
1770 {
1771 voptgenerror
1772 (FLG_FORMATCONST,
1773 message ("Format string parameter to %s is not a compile-time constant: %s",
1774 exprNode_unparse (f),
1775 exprNode_unparse (a)),
1776 f->loc);
1777 }
616915dd 1778 }
28bf4b0b 1779
616915dd 1780 fileloc_free (formatloc);
1781}
1782
1783static void
1784checkScanfArgs (/*@notnull@*/ /*@dependent@*/ exprNode f, uentry fcn,
1785 exprNodeList args, exprNode ret, int argno)
1786{
1787 int i = argno;
1788 fileloc formatloc;
1789 int nargs = exprNodeList_size (args);
1790 uentryList params = uentry_getParams (fcn);
1791 exprNode a;
1792
1793 /*
1794 ** These should be ensured by checkSpecialFunction
1795 */
1796
1797 llassert (uentryList_size (params) == argno + 1);
1798 llassert (uentry_isElipsisMarker (uentryList_getN (params, argno)));
1799
1800 a = exprNodeList_getN (args, argno - 1);
1801 formatloc = fileloc_copy (exprNode_loc (a));
1802
1803 if (exprNode_isDefined (a) && exprNode_isStringLiteral (a)
1804 && exprNode_knownStringValue (a))
1805 {
1806 char *format = cstring_toCharsSafe (multiVal_forceString (exprNode_getValue (a)));
1807 char *code = format;
1808 char *ocode = code;
1809
1810 nargs = exprNodeList_size (args);
1811
1812 while ((code = strchr (code, '%')) != NULL)
1813 {
1814 char *origcode = code;
1815 char key = *(++code);
28bf4b0b 1816 cstring codetext = cstring_newEmpty ();
616915dd 1817 ctype modtype = ctype_int;
1818 char modifier = '\0';
1819 bool modified = TRUE;
1820 bool ignore = FALSE;
1821
28bf4b0b 1822 codetext = cstring_appendChar (codetext, key);
616915dd 1823 fileloc_addColumn (formatloc, code - ocode);
1824
1825 /*
1826 ** this is based on ANSI standard library description of fscanf
1827 ** (from ANSI standard X3.159-1989, 4.9.6.1)
1828 */
1829
1830 /* '*' suppresses assignment (does not need match argument) */
1831
1832 if (key == '*')
1833 {
1834 key = *(++code);
28bf4b0b 1835 codetext = cstring_appendChar (codetext, key);
616915dd 1836 modified = FALSE;
1837 ignore = TRUE;
1838 fileloc_incColumn (formatloc);
1839 }
1840
1841 /* ignore field width */
1842 while (isdigit ((int) key) != 0)
1843 {
1844 key = *(++code);
28bf4b0b 1845 codetext = cstring_appendChar (codetext, key);
616915dd 1846 fileloc_incColumn (formatloc);
1847 }
1848
1849 if (key == 'h')
1850 {
1851 modtype = ctype_sint; /* short */
1852 key = *(++code);
28bf4b0b 1853 codetext = cstring_appendChar (codetext, key);
616915dd 1854 fileloc_incColumn (formatloc);
1855 }
1856 else if (key == 'l' || key == 'L')
1857 {
1858 modtype = ctype_lint; /* long */
1859 modifier = key;
1860
1861 key = *(++code);
28bf4b0b 1862 codetext = cstring_appendChar (codetext, key);
1863
616915dd 1864 fileloc_incColumn (formatloc);
1865
1866 if (key == 'l' || key == 'L') {
1867 modtype = ctype_llint; /* long long */
1868 key = *(++code);
28bf4b0b 1869 codetext = cstring_appendChar (codetext, key);
616915dd 1870 fileloc_incColumn (formatloc);
1871 }
1872 }
1873 else
1874 {
1875 ; /* no modifier */
1876 }
1877
1878 /* now, key = type of conversion to apply */
1879 ++code;
1880 fileloc_incColumn (formatloc);
1881
1882 if (key != '%')
1883 {
1884 if (ignore)
1885 {
1886 ;
1887 }
1888 else
1889 {
1890 if (i >= nargs)
1891 {
1892 if (optgenerror
1893 (FLG_TYPE,
1894 message ("No argument corresponding to %q format "
28bf4b0b 1895 "code %d (%%%s): \"%s\"",
616915dd 1896 uentry_getName (fcn),
28bf4b0b 1897 i, codetext,
616915dd 1898 cstring_fromChars (format)),
1899 f->loc))
1900 {
1901 if (fileloc_isDefined (formatloc)
1902 && context_getFlag (FLG_SHOWCOL))
1903 {
1904 llgenindentmsg
1905 (cstring_makeLiteral ("Corresponding format code"),
1906 formatloc);
1907 }
1908 }
1909 i++;
1910 }
1911 else
1912 {
1913 a = exprNodeList_getN (args, i);
1914 i++;
1915
1916 if (!exprNode_isError (a))
1917 {
1918 ctype expecttype;
1919
1920 switch (key)
1921 {
1922 case '*': /* int argument for fieldwidth */
1923 expecttype = ctype_makePointer (ctype_int);
1924 *(--code) = '%'; /* convert it for next code */
1925 fileloc_subColumn (formatloc, 1);
1926 /*@switchbreak@*/ break;
1927 case 'u':
1928 case 'o':
1929 expecttype = ctype_makePointer (ctype_combine (ctype_uint, modtype));
1930 /*@switchbreak@*/ break;
1931
1932 case 'i':
1933 case 'd':
e0a05ba9 1934 expecttype = ctype_makePointer (ctype_combine (ctype_int, modtype));
1935 /*@switchbreak@*/ break;
1936
616915dd 1937 case 'x':
1938 case 'X': /* unsigned int */
e0a05ba9 1939 expecttype = ctype_makePointer (ctype_combine (ctype_uint, modtype));
616915dd 1940 /*@switchbreak@*/ break;
1941
1942 case 'e':
1943 case 'E':
1944 case 'g':
1945 case 'G':
1946 case 'f':
1947 /* printf is double, scanf is float! */
1948
1949 if (modifier == 'l')
1950 {
1951 expecttype = ctype_makePointer (ctype_double);
1952 }
1953 else if (modifier == 'L')
1954 {
1955 expecttype = ctype_makePointer (ctype_ldouble);
1956 }
1957 else
1958 {
1959 llassert (modifier == '\0');
1960 expecttype = ctype_makePointer (ctype_float);
1961 }
1962 /*@switchbreak@*/ break;
1963
1964 case 'c': /* int converted to char (check its a char?) */
1965 expecttype = ctype_makePointer (ctype_makeConj (ctype_char, ctype_uchar));
1966 /*@switchbreak@*/ break;
1967
1968 case 's': /* string */
1969 expecttype = ctype_string;
1970 /*@switchbreak@*/ break;
1971
1972 case '[':
1973 /* skip to ']' */
1974 while (((key = *(++code)) != ']')
1975 && (key != '\0'))
1976 {
28bf4b0b 1977 codetext = cstring_appendChar (codetext, key);
616915dd 1978 fileloc_incColumn (formatloc);
1979 }
1980
1981 if (key == '\0')
1982 {
1983 llfatalerrorLoc
1984 (message ("Bad character set format: %s",
1985 cstring_fromChars (origcode)));
1986 }
1987
1988 expecttype = ctype_string;
1989 /*@switchbreak@*/ break;
346fab44 1990
616915dd 1991
1992 case 'p': /* pointer */
346fab44 1993 voptgenerror
1994 (FLG_FORMATCODE,
1995 message ("Format code should not be used in scanf: %s",
1996 cstring_fromChars (origcode)),
1997 fileloc_isDefined (formatloc)
1998 ? formatloc : g_currentloc);
1999
616915dd 2000 expecttype = ctype_unknown;
616915dd 2001 /*@switchbreak@*/ break;
2002
2003 case 'n': /* pointer to int, modified by call! */
2004 expecttype = ctype_makePointer (ctype_int);
2005 /*@switchbreak@*/ break;
2006
2007 default:
2008 expecttype = ctype_unknown;
2009
2010 voptgenerror
2011 (FLG_FORMATCODE,
2012 message ("Unrecognized format code: %s",
2013 cstring_fromChars (origcode)),
2014 fileloc_isDefined (formatloc)
2015 ? formatloc : g_currentloc);
2016
2017 /*@switchbreak@*/ break;
2018 }
2019
2020 if (!(exprNode_matchArgType (expecttype, a)))
2021 {
2022 if (ctype_isVoidPointer (expecttype)
2023 && ctype_isRealAbstract (a->typ)
2024 && (context_getFlag (FLG_ABSTVOIDP)))
2025 {
2026 ;
2027 }
2028 else
2029 {
28bf4b0b 2030 if (llgenformattypeerror
2031 (expecttype, exprNode_undefined,
2032 a->typ, a,
2033 message ("Format argument %d to %q (%%%s) expects "
2034 "%t gets %t: %s",
2035 i - argno,
2036 uentry_getName (fcn),
2037 codetext, expecttype,
2038 a->typ, exprNode_unparse (a)),
2039 a->loc))
616915dd 2040 {
28bf4b0b 2041 if (fileloc_isDefined (formatloc)
2042 && context_getFlag (FLG_SHOWCOL))
616915dd 2043 {
28bf4b0b 2044 llgenindentmsg
2045 (cstring_makeLiteral
2046 ("Corresponding format code"),
2047 formatloc);
616915dd 2048 }
2049 }
2050 }
2051 }
2052
2053 uentry_setType (outArg, expecttype);
2054 checkOneArg (outArg, a, f, FALSE, i+1, nargs);
2055 uentry_setType (outArg, ctype_unknown);
2056 uentry_fixupSref (outArg);
2057
2058 if (modified)
2059 {
2060 exprNode_checkCallModifyVal (a->sref, args, f, ret);
2061 }
2062 }
2063 else
2064 {
02b84d4b 2065 /* a->sref = sRef_undefined; */
616915dd 2066 }
2067 }
2068 }
2069 }
28bf4b0b 2070
616915dd 2071 ocode = code;
28bf4b0b 2072 cstring_free (codetext);
616915dd 2073 }
2074
2075 if (i < nargs)
2076 {
2077 voptgenerror (FLG_TYPE,
28bf4b0b 2078 message ("Format string for %q has %d arg%&, given %d",
616915dd 2079 uentry_getName (fcn), i - argno, nargs - argno),
2080 f->loc);
2081 }
2082 }
2083 else
2084 {
2085 /* no checking possible for compile-time unknown format strings */
2086 }
2087
2088 fileloc_free (formatloc);
2089}
2090
2091static void
2092checkMessageArgs (/*@notnull@*/ /*@dependent@*/ exprNode f,
2093 uentry fcn,
2094 exprNodeList args,
2095 /*@unused@*/ int argno)
2096{
2097 /*
2098 ** the last argument before the elips is the format string
2099 */
2100
2101 int nargs = exprNodeList_size (args);
2102 int i = argno;
2103 fileloc formatloc;
2104 exprNode a;
2105
2106 a = exprNodeList_getN (args, argno - 1);
2107 formatloc = fileloc_copy (exprNode_loc (a));
2108
2109 if (ctype_isUnknown (cstringType)) {
2110 if (usymtab_existsType (cstring_makeLiteralTemp ("cstring")))
2111 {
2112 cstringType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("cstring"));
2113 }
2114 }
2115
2116 if (ctype_isUnknown (ctypeType)) {
2117 if (usymtab_existsType (cstring_makeLiteralTemp ("ctype")))
2118 {
2119 ctypeType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("ctype"));
2120 }
2121 }
2122
2123 if (ctype_isUnknown (filelocType)) {
2124 if (usymtab_existsType (cstring_makeLiteralTemp ("fileloc")))
2125 {
2126 filelocType = usymtab_lookupAbstractType (cstring_makeLiteralTemp ("fileloc"));
2127 }
2128 }
2129
2130 if (exprNode_isDefined (a) && exprNode_isStringLiteral (a)
2131 && exprNode_knownStringValue (a))
2132 {
2133 cstring format = multiVal_forceString (exprNode_getValue (a));
2134 char *code = cstring_toCharsSafe (format);
2135 char *ocode = code;
2136
2137 nargs = exprNodeList_size (args);
2138
2139 while ((code = strchr (code, '%')) != NULL)
2140 {
2141 char *origcode = code;
2142 char key = *(++code);
28bf4b0b 2143 cstring codetext = cstring_newEmpty ();
616915dd 2144 bool isOnly = FALSE;
2145
28bf4b0b 2146 codetext = cstring_appendChar (codetext, key);
2147
616915dd 2148 fileloc_addColumn (formatloc, code - ocode);
2149
2150 while (key >= '0' && key <= '9')
2151 {
2152 key = *(++code);
28bf4b0b 2153 codetext = cstring_appendChar (codetext, key);
616915dd 2154 fileloc_incColumn (formatloc);
2155 }
2156
2157 ++code;
2158 fileloc_incColumn (formatloc);
2159
2160 if (key != '%')
2161 {
28bf4b0b 2162 if (key == '&') /* plural marker */
616915dd 2163 {
2164 goto nextKey;
2165 }
2166
2167 if (i >= nargs)
2168 {
2169 voptgenerror
2170 (FLG_TYPE,
28bf4b0b 2171 message ("Message missing format arg %d (%%%s): \"%s\"",
2172 i + 1, codetext, format),
616915dd 2173 f->loc);
2174 i++;
2175 }
2176 else
2177 {
2178 a = exprNodeList_getN (args, i);
2179 i++;
2180
2181 nextKey:
2182 if (!exprNode_isError (a))
2183 {
2184 ctype expecttype;
2185
2186 /*@-loopswitchbreak@*/
2187
2188 switch (key)
2189 {
2190 case 'c':
2191 case 'h':
2192 expecttype = ctype_char; break;
2193 case 's':
2194 expecttype = cstringType; break;
2195 case 'q':
2196 expecttype = cstringType; isOnly = TRUE; break;
2197 case 'x':
2198 expecttype = cstringType; isOnly = TRUE; break;
2199 case 'd': expecttype = ctype_int; break;
2200 case 'u': expecttype = ctype_uint; break;
2201 case 'w': expecttype = ctype_ulint; break;
2202 case 'f': expecttype = ctype_float; break;
2203 case 'b': expecttype = ctype_bool; break;
2204 case 't': expecttype = ctypeType; break;
393e573f 2205 case 'p':
2206 expecttype = ctype_makePointer (ctype_void);
2207 /* need not be defined */
2208 uentry_setDefState (regArg, SS_RELDEF);
2209 sRef_setPosNull (uentry_getSref (regArg),
2210 fileloc_undefined);
2211 /* could be null */
2212 /*@switchbreak@*/ break;
616915dd 2213 case 'l': expecttype = filelocType; break;
28bf4b0b 2214 case '&': /* a wee bit of a hack methinks */
616915dd 2215 expecttype = ctype_int;
2216 break;
2217 case 'r': expecttype = ctype_bool; break;
2218 default:
2219 expecttype = ctype_unknown;
2220 voptgenerror
2221 (FLG_FORMATCODE,
2222 message ("Unrecognized format code: %s",
2223 cstring_fromChars (origcode)),
2224 fileloc_isDefined (formatloc)
2225 ? formatloc : g_currentloc);
2226 break;
2227 }
2228 /*@=loopswitchbreak@*/
2229
2230 if (!(exprNode_matchArgType (expecttype, a)))
2231 {
2232 if (ctype_isVoidPointer (expecttype)
2233 && ctype_isRealAbstract (a->typ)
2234 && (context_getFlag (FLG_ABSTVOIDP)))
2235 {
2236 ;
2237 }
2238 else
2239 {
2240 if (llgenformattypeerror
2241 (expecttype, exprNode_undefined,
2242 a->typ, a,
28bf4b0b 2243 message ("Format argument %d to %q (%%%s) expects "
616915dd 2244 "%t gets %t: %s",
2245 i - argno,
2246 uentry_getName (fcn),
28bf4b0b 2247 codetext, expecttype,
616915dd 2248 a->typ, exprNode_unparse (a)),
2249 a->loc))
b73d1009 2250 {
616915dd 2251 if (fileloc_isDefined (formatloc)
2252 && context_getFlag (FLG_SHOWCOL))
2253 {
2254 llgenindentmsg
2255 (cstring_makeLiteral
2256 ("Corresponding format code"),
2257 formatloc);
2258 }
2259 }
2260 }
2261 }
2262
2263 if (ctype_equal (expecttype, cstringType))
2264 {
2265 if (isOnly)
2266 {
2267 checkOneArg (csOnlyArg, a, f, FALSE, i+1, nargs);
2268 uentry_fixupSref (csOnlyArg);
2269 }
2270 else
2271 {
2272 checkOneArg (csArg, a, f, FALSE, i+1, nargs);
2273 uentry_fixupSref (csArg);
2274 }
2275 }
2276 else
2277 {
2278 checkOneArg (regArg, a, f, FALSE, i+1, nargs);
2279 uentry_fixupSref (regArg);
2280 }
2281 }
2282 }
2283 }
28bf4b0b 2284
2285 cstring_free (codetext);
616915dd 2286 }
2287
2288 if (i < nargs)
2289 {
2290 voptgenerror (FLG_TYPE,
28bf4b0b 2291 message ("Format string for %q has %d arg%&, given %d",
616915dd 2292 uentry_getName (fcn), i - argno, nargs -argno),
2293 f->loc);
2294 }
2295 }
2296 else
2297 {
2298 /* no checking possible for compile-time unknown format strings */
2299 }
2300
2301 fileloc_free (formatloc);
2302}
2303
2304static void
2305 checkExpressionDefinedAux (/*@notnull@*/ exprNode e1,
2306 /*@notnull@*/ exprNode e2,
2307 sRefSet sets1,
2308 sRefSet sets2,
2309 lltok op,
2310 flagcode flag)
2311{
2312 bool hadUncon = FALSE;
2313
28bf4b0b 2314 if (sRef_isFileOrGlobalScope (sRef_getRootBase (e1->sref)) &&
616915dd 2315 sRefSet_hasUnconstrained (sets2))
2316 {
2317 voptgenerror
2318 (FLG_EVALORDERUNCON,
2319 message
2320 ("Expression may have undefined behavior (%q used in right operand "
2321 "may set global variable %q used in left operand): %s %s %s",
2322 sRefSet_unparseUnconstrained (sets2),
2323 sRef_unparse (sRef_getRootBase (e1->sref)),
2324 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2325 e2->loc);
2326 }
2327
28bf4b0b 2328 if (sRef_isFileOrGlobalScope (sRef_getRootBase (e2->sref)) &&
616915dd 2329 sRefSet_hasUnconstrained (sets1))
2330 {
2331 voptgenerror
2332 (FLG_EVALORDERUNCON,
2333 message
2334 ("Expression has undefined behavior (%q used in left operand "
2335 "may set global variable %q used in right operand): %s %s %s",
2336 sRefSet_unparseUnconstrained (sets1),
2337 sRef_unparse (e2->sref),
2338 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2339 e2->loc);
2340 }
2341
2342 sRefSet_realElements (e1->uses, sr)
2343 {
2344 if (sRef_isMeaningful (sr) && sRefSet_member (sets2, sr))
2345 {
2346 voptgenerror
2347 (FLG_EVALORDER,
2348 message
2349 ("Expression has undefined behavior (left operand uses %q, "
2350 "modified by right operand): %s %s %s",
2351 sRef_unparse (sr),
2352 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2353 e2->loc);
2354 }
2355 } end_sRefSet_realElements;
2356
2357 sRefSet_realElements (sets1, sr)
2358 {
2359 if (sRef_isMeaningful (sr))
2360 {
2361 if (sRef_same (sr, e2->sref))
2362 {
2363 voptgenerror
2364 (flag,
2365 message
2366 ("Expression has undefined behavior (value of right operand "
2367 "modified by left operand): %s %s %s",
2368 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2369 e2->loc);
2370 }
2371 else if (sRefSet_member (e2->uses, sr))
2372 {
2373 voptgenerror
2374 (flag,
2375 message
2376 ("Expression has undefined behavior (left operand modifies %q, "
2377 "used by right operand): %s %s %s",
2378 sRef_unparse (sr),
2379 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
2380 e2->loc);
2381 }
2382 else
2383 {
2384 if (sRefSet_member (sets2, sr))
2385 {
2386 if (sRef_isUnconstrained (sr))
2387 {
2388 if (hadUncon)
2389 {
2390 ;
2391 }
2392 else
2393 {
2394 hadUncon = optgenerror
2395 (FLG_EVALORDERUNCON,
2396 message
2397 ("Expression may have undefined behavior. Left operand "
2398 "calls %q; right operand calls %q. The unconstrained "
2399 "functions may modify global state used by "
2400 "the other operand): %s %s %s",
2401 sRefSet_unparseUnconstrained (sets1),
2402 sRefSet_unparseUnconstrained (sets2),
2403 exprNode_unparse (e1), lltok_unparse (op),
2404 exprNode_unparse (e2)),
2405 e2->loc);
2406 }
2407 }
2408 else
2409 {
2410 voptgenerror
2411 (flag,
2412 message
2413 ("Expression has undefined behavior (both "
2414 "operands modify %q): %s %s %s",
2415 sRef_unparse (sr),
2416 exprNode_unparse (e1),
2417 lltok_unparse (op), exprNode_unparse (e2)),
2418 e2->loc);
2419 }
2420 }
2421 }
2422 }
2423 } end_sRefSet_realElements;
2424}
2425
2426static void checkExpressionDefined (exprNode e1, exprNode e2, lltok op)
2427{
2428 bool hasError = FALSE;
2429
2430 if (exprNode_isError (e1) || exprNode_isError (e2))
2431 {
2432 return;
2433 }
2434
2435 if (sRefSet_member (e2->sets, e1->sref))
2436 {
2437 if (e2->kind == XPR_CALL)
2438 {
2439 ;
2440 }
2441 else
2442 {
2443 hasError = optgenerror
2444 (FLG_EVALORDER,
2445 message ("Expression has undefined behavior "
ccf0a4a8 2446 "(value of left operand %s is modified "
2447 "by right operand %s): %s %s %s",
2448 exprNode_unparse (e1),
2449 exprNode_unparse (e2),
616915dd 2450 exprNode_unparse (e1), lltok_unparse (op),
2451 exprNode_unparse (e2)),
2452 e2->loc);
2453 }
2454 }
2455
2456 if (context_getFlag (FLG_EVALORDERUNCON))
2457 {
2458 if (sRefSet_member (e2->msets, e1->sref))
2459 {
2460 if (e2->kind == XPR_CALL)
2461 {
2462 ;
2463 }
2464 else
2465 {
2466 hasError = optgenerror
2467 (FLG_EVALORDER,
2468 message
2469 ("Expression has undefined behavior (value of left "
2470 "operand may be modified by right operand): %s %s %s",
2471 exprNode_unparse (e1), lltok_unparse (op),
2472 exprNode_unparse (e2)),
2473 e2->loc);
2474 }
2475 }
2476 }
2477
2478 if (!hasError)
2479 {
2480 checkExpressionDefinedAux (e1, e2, e1->sets, e2->sets, op, FLG_EVALORDER);
2481
2482 if (context_maybeSet (FLG_EVALORDERUNCON))
2483 {
2484 checkExpressionDefinedAux (e1, e2, e1->msets,
2485 e2->msets, op, FLG_EVALORDERUNCON);
2486 }
2487 }
2488}
2489
2490static void checkSequencing (exprNode p_f, exprNodeList p_args);
2491
2492static int
2493 checkArgsReal (uentry fcn, /*@dependent@*/ exprNode f, uentryList cl,
2494 exprNodeList args, bool isIter, exprNode ret)
2495{
2496 int special = 0;
2497
2498 if (!exprNode_isError (f))
2499 {
2500 if (!uentryList_isMissingParams (cl))
2501 {
2502 int nargs = exprNodeList_size (args);
2503 int expectargs = uentryList_size (cl);
2504 ctype last;
2505 int i = 0;
2506
2507 if (expectargs == 0)
2508 {
2509 if (nargs != 0)
2510 {
2511 if (isIter)
2512 {
2513 voptgenerror
2514 (FLG_TYPE,
2515 message ("Iter %q invoked with %d args, "
2516 "declared void",
2517 uentry_getName (fcn),
2518 nargs),
2519 f->loc);
2520 }
2521 else
2522 {
2523 voptgenerror
2524 (FLG_TYPE,
2525 message ("Function %s called with %d args, "
2526 "declared void",
2527 exprNode_unparse (f), nargs),
2528 f->loc);
2529 }
2530 }
2531 return special;
2532 }
2533
2534 last = uentry_getType (uentryList_getN (cl, expectargs - 1));
2535
2536 exprNodeList_reset (args);
2537
2538 uentryList_elements (cl, current)
2539 {
2540 ctype ct = uentry_getType (current);
2541 exprNode a;
2542
2543 if (ctype_isElips (ct))
2544 {
2545 /*
2546 ** do special checking for printf/scanf library functions
2547 **
2548 ** this is kludgey code, just for handling the special case
2549 **
2550 */
2551
2552 if (uentry_isPrintfLike (fcn))
2553 {
2554 checkPrintfArgs (f, fcn, args, ret, i);
2555 special = i;
2556 }
2557 else if (uentry_isScanfLike (fcn))
2558 {
2559 checkScanfArgs (f, fcn, args, ret, i);
2560 special = i;
2561 }
2562 else if (uentry_isMessageLike (fcn))
2563 {
2564 checkMessageArgs (f, fcn, args, i);
2565 special = i;
2566 }
2567 else
2568 {
2569 llassert (!uentry_isSpecialFunction (fcn));
2570 }
2571
2572 nargs = expectargs; /* avoid errors */
2573 break;
2574 }
2575 else
2576 {
2577 if (i >= nargs) break;
2578
2579 a = exprNodeList_current (args);
2580 exprNodeList_advance (args);
2581
2582 i++;
2583
2584 if (exprNode_isError (a))
2585 {
2586 ;
2587 }
2588 else
2589 {
2590 /*
2591 probably necessary? I'm not sure about this one
2592 checkMacroParen (a);
2593 */
2594
2595 f->guards = guardSet_union (f->guards, a->guards);
2596
2597 DPRINTF (("match arg: %s / %s", ctype_unparse (ct), ctype_unparse (a->typ)));
e0a05ba9 2598
616915dd 2599 if (!(exprNode_matchArgType (ct, a)))
2600 {
2601 DPRINTF (("Args mismatch!"));
2602
2603 if (ctype_isVoidPointer (ct)
2604 && (ctype_isPointer (a->typ)
2605 && (ctype_isRealAbstract (ctype_baseArrayPtr (a->typ)))))
2606 {
2607 vnoptgenerror
2608 (FLG_ABSTVOIDP,
2609 message
2610 ("Pointer to abstract type (%t) used "
2611 "as void pointer "
2612 "(arg %d to %q): %s",
2613 a->typ, i,
2614 uentry_getName (fcn),
2615 exprNode_unparse (a)),
2616 a->loc);
2617 }
2618 else
2619 {
2620 if (isIter)
2621 {
2622 (void) gentypeerror
2623 (ct, exprNode_undefined,
2624 a->typ, a,
2625 message
2626 ("Iter %q expects arg %d to "
2627 "be %t gets %t: %s",
2628 uentry_getName (fcn),
2629 i, ct, a->typ, exprNode_unparse (a)),
2630 a->loc);
2631 }
2632 else
2633 {
2634 if (gentypeerror
2635 (ct,
2636 exprNode_undefined,
2637 a->typ,
2638 a,
2639 message
2640 ("Function %q expects arg %d to be %t gets %t: %s",
2641 uentry_getName (fcn),
2642 i, ct, a->typ, exprNode_unparse (a)),
2643 a->loc))
2644 {
2645 DPRINTF (("Types: %s / %s",
2646 ctype_unparse (ct),
2647 ctype_unparse (a->typ)));
2648 }
2649
2650 /*
2651 ** Clear null marker for abstract types.
2652 ** (It is not revealed, so suppress future messages.)
2653 */
2654
2655 if (ctype_isAbstract (a->typ))
2656 {
2657 sRef_setNullUnknown (exprNode_getSref (a), a->loc);
2658 }
2659 }
2660 }
2661 }
2662 }
2663 }
2664 } end_uentryList_elements ;
2665
2666
2667 if (expectargs != nargs) /* note: not != since we may have ... */
2668 {
2669 if (ctype_isElips (last))
2670 {
2671 voptgenerror
2672 (FLG_TYPE,
2673 message ("Function %s called with %d args, expects at least %d",
2674 exprNode_unparse (f),
2675 nargs, expectargs - 1),
2676 f->loc);
2677 }
2678 else
2679 {
2680 if (isIter)
2681 {
2682 voptgenerror
2683 (FLG_TYPE,
2684 message ("Iter %q invoked with %d args, expects %d",
2685 uentry_getName (fcn), nargs, expectargs),
2686 f->loc);
2687 }
2688 else
2689 {
2690 voptgenerror
2691 (FLG_TYPE,
2692 message ("Function %s called with %d args, expects %d",
2693 exprNode_unparse (f),
2694 nargs, expectargs),
2695 f->loc);
2696 }
2697 }
2698 }
2699 }
2700 }
2701
2702 return special;
2703}
2704
2705/*
2706** Check for undefined code sequences in function arguments:
2707**
2708** one parameter sets something used by another parameter
2709** one parameter sets something set by another parameter
2710*/
2711
2712static void
2713checkSequencingOne (exprNode f, exprNodeList args,
2714 /*@notnull@*/ exprNode el, int argno)
2715{
2716 /*
2717 ** Do second loop, iff +undefunspec
2718 */
2719
2720 int checkloop;
2721 int numloops = context_maybeSet (FLG_EVALORDERUNCON) ? 2 : 1;
2722
2723 for (checkloop = 0; checkloop < numloops; checkloop++)
2724 {
2725 sRefSet thissets;
2726
2727 if (checkloop == 0)
2728 {
2729 thissets = el->sets;
2730 }
2731 else
2732 {
2733 llassert (checkloop == 1);
2734 thissets = el->msets;
2735 }
2736
2737 sRefSet_realElements (thissets, thisset)
2738 {
2739 int j;
2740
2741 /*@access exprNodeList@*/
2742 for (j = 0; j < args->nelements; j++)
2743 {
2744 exprNode jl = args->elements[j];
2745 int thisargno = j + 1;
2746
2747 if (thisargno != argno && exprNode_isDefined (jl))
2748 {
2749 sRefSet otheruses = jl->uses;
2750
28bf4b0b 2751 if (sRef_isFileOrGlobalScope (sRef_getRootBase (jl->sref)) &&
616915dd 2752 sRefSet_hasUnconstrained (thissets))
2753 {
2754 voptgenerror
2755 (FLG_EVALORDERUNCON,
2756 /*@-sefparams@*/
2757 message
2758 ("%q used in argument %d may set "
2759 "global variable %q used by argument %d: %s(%q)",
2760 cstring_capitalizeFree (sRefSet_unparseUnconstrained (thissets)),
2761 /*@=sefparams@*/
2762 argno,
2763 sRef_unparse (sRef_getRootBase (jl->sref)),
2764 thisargno,
2765 exprNode_unparse (f), exprNodeList_unparse (args)),
2766 el->loc);
2767 }
2768
2769 if (sRefSet_member (otheruses, thisset))
2770 {
2771 if (sRef_isUnconstrained (thisset))
2772 {
2773 voptgenerror
2774 (FLG_EVALORDERUNCON,
2775 message
2776 ("Unconstrained functions used in arguments %d (%q) "
2777 "and %d (%s) may modify "
2778 "or use global state in undefined way: %s(%q)",
2779 argno,
2780 sRefSet_unparseUnconstrainedPlain (otheruses),
2781 thisargno,
2782 sRef_unconstrainedName (thisset),
2783 exprNode_unparse (f),
2784 exprNodeList_unparse (args)),
2785 el->loc);
2786 }
2787 else
2788 {
2789 voptgenerror
2790 (FLG_EVALORDER,
2791 message
2792 ("Argument %d modifies %q, used by argument %d "
2793 "(order of evaluation of actual parameters is "
2794 "undefined): %s(%q)",
2795 argno, sRef_unparse (thisset), thisargno,
2796 exprNode_unparse (f), exprNodeList_unparse (args)),
2797 el->loc);
2798 }
2799 }
2800 else
2801 {
2802 sRefSet othersets = jl->sets;
2803
2804 if (sRefSet_member (othersets, thisset))
2805 {
2806 if (sRef_isUnconstrained (thisset))
2807 {
2808 voptgenerror
2809 (FLG_EVALORDERUNCON,
2810 message
2811 ("Unconstrained functions used in "
2812 "arguments %d (%q) and %d (%s) may modify "
2813 "or use global state in undefined way: %s(%q)",
2814 argno,
2815 sRefSet_unparseUnconstrainedPlain (othersets),
2816 thisargno,
2817 sRef_unconstrainedName (thisset),
2818 exprNode_unparse (f), exprNodeList_unparse (args)),
2819 el->loc);
2820 }
2821 else
2822 {
2823 voptgenerror
2824 (FLG_EVALORDER,
2825 message
2826 ("Argument %d modifies %q, set by argument %d (order of"
2827 " evaluation of actual parameters is undefined): %s(%q)",
2828 argno, sRef_unparse (thisset), thisargno,
2829 exprNode_unparse (f), exprNodeList_unparse (args)),
2830 el->loc);
2831 }
2832 }
2833 }
2834 }
2835 }
2836 /*@noaccess exprNodeList@*/
2837 } end_sRefSet_realElements;
2838 }
2839}
2840
2841static void
2842checkSequencing (exprNode f, exprNodeList args)
2843{
2844 if (exprNodeList_size (args) > 1)
2845 {
2846 int i;
2847 exprNode el;
2848
2849 /*@access exprNodeList*/
2850
2851 for (i = 0; i < args->nelements; i++)
2852 {
2853 el = args->elements[i];
2854
2855 if (!exprNode_isError (el))
2856 {
2857 checkSequencingOne (f, args, el, i + 1);
2858 }
2859 }
2860 /*@noaccess exprNodeList*/
2861 }
2862}
2863
2864/*
2865** requires le = exprNode_getUentry (f)
2866*/
2867
2868static void
2869checkGlobMods (/*@notnull@*/ /*@dependent@*/ exprNode f,
2870 uentry le, exprNodeList args,
2871 /*@notnull@*/ exprNode ret, int specialArgs)
2872{
2873 bool isSpec = FALSE;
2874 bool hasMods = FALSE;
2875 cstring fname;
2876 globSet usesGlobs = globSet_undefined;
2877 sRefSet mods = sRefSet_undefined;
2878 bool freshMods = FALSE;
2879 uentryList params = uentryList_undefined;
2880
28bf4b0b 2881 DPRINTF (("Check glob mods: %s", exprNode_unparse (ret)));
2882
616915dd 2883 /*
2884 ** check globals and modifies
2885 */
2886
2887 setCodePoint ();
2888
2889 if (!uentry_isValid (le))
2890 {
2891 ctype fr = ctype_realType (f->typ);
2892
2893 if (ctype_isFunction (fr))
2894 {
2895 params = ctype_argsFunction (fr);
2896 }
2897 else
2898 {
2899 params = uentryList_missingParams;
2900 }
2901
2902 if (!context_getFlag (FLG_MODNOMODS)
2903 && !context_getFlag (FLG_GLOBUNSPEC))
2904 {
28bf4b0b 2905 checkUnspecCall (f, params, args);
616915dd 2906 }
2907
2908 return;
2909 }
2910
2911 fname = uentry_rawName (le);
2912
2913 setCodePoint ();
2914
2915 if (uentry_isFunction (le))
2916 {
2917 params = uentry_getParams (le);
2918 mods = uentry_getMods (le);
2919 hasMods = uentry_hasMods (le);
2920 usesGlobs = uentry_getGlobs (le);
2921 isSpec = uentry_isSpecified (le);
2922 }
2923 else /* not a function */
2924 {
2925 ctype ct = ctype_realType (uentry_getType (le));
2926
2927 llassertprint (uentry_isVar (le) && ctype_isFunction (ct),
2928 ("checkModGlobs: uentry not a function: %s",
2929 uentry_unparse (le)));
2930
2931 params = ctype_argsFunction (ct);
517a2db3 2932 return; /* No checking for non-function */
616915dd 2933 }
2934
2935 /*
2936 ** check globals
2937 */
2938
2939 setCodePoint ();
616915dd 2940
2941 globSet_allElements (usesGlobs, el)
2942 {
2943 if (sRef_isValid (el))
2944 {
2945 if (sRef_isInternalState (el) || sRef_isSystemState (el))
2946 {
2947 context_usedGlobal (el);
2948 exprNode_checkUse (f, el, f->loc);
2949
2950 if (context_checkInternalUse ())
2951 {
2952 if (!context_globAccess (el))
2953 {
2954 if (sRef_isSystemState (el)
2955 && !context_getFlag (FLG_MODFILESYSTEM))
2956 {
2957 ;
2958 }
2959 else
2960 {
2961 voptgenerror
2962 (FLG_INTERNALGLOBS,
2963 message
2964 ("Called procedure %s may access %q, but "
2965 "globals list does not include globals %s",
2966 exprNode_unparse (f),
2967 sRef_unparse (el),
2968 cstring_makeLiteralTemp (sRef_isInternalState (el)
2969 ? "internalState"
2970 : "fileSystem")),
2971 f->loc);
2972 }
2973 }
2974 }
2975 }
2976 else if (sRef_isNothing (el) || sRef_isSpecState (el))
2977 {
2978 ;
2979 }
2980 else
2981 {
2982 uentry gle = sRef_getUentry (el);
2983 sRef sr = sRef_updateSref (el);
2984
2985 if (sRef_isUndefGlob (el))
2986 {
2987 sRef_setDefined (sr, f->loc);
2988 exprNode_checkSet (f, sr);
2989 }
2990 else
2991 {
2992 /*
2993 ** check definition
2994 */
2995
2996 if (sRef_isAllocated (el))
2997 {
2998 exprNode_checkSet (f, sr);
2999 }
3000 else
3001 {
3002 if (sRef_isStateUndefined (sr))
3003 {
3004 voptgenerror
3005 (FLG_GLOBSTATE,
3006 message
3007 ("%s %q used by function undefined before call: %s",
3008 sRef_getScopeName (sr),
3009 sRef_unparse (sr),
3010 exprNode_unparse (f)),
3011 f->loc);
3012 sRef_setDefined (sr, f->loc);
3013 }
3014 exprNode_checkUse (f, sr, f->loc);
3015 }
3016
3017 checkGlobUse (gle, TRUE, f);
3018 }
3019
3020 if (sRef_isKilledGlob (el))
3021 {
3022 sRef_kill (sr, f->loc);
3023 context_usedGlobal (sr);
3024 }
3025 }
3026 }
3027 } end_globSet_allElements;
3028
3029 /*
3030 ** check modifies
3031 */
3032
3033 if (context_hasMods () || context_getFlag (FLG_MODNOMODS))
3034 {
3035 sRefSet smods = sRefSet_undefined;
3036
3037 /*
3038 ** NEED to check for modifies anything
3039 */
3040
3041 /*
3042 ** check each sRef that called function modifies (ml), is
3043 ** modifiable by tl
3044 */
3045
3046 setCodePoint ();
3047
3048 sRefSet_allElements (mods, s) /* s is something which may be modified */
3049 {
28bf4b0b 3050 DPRINTF (("Check modify: %s", sRef_unparse (s)));
3051
616915dd 3052 if (sRef_isKindSpecial (s))
3053 {
3054 if (sRef_isSpecInternalState (s))
3055 {
3056 if (context_getFlag (FLG_MODINTERNALSTRICT))
3057 {
3058 exprNode_checkCallModifyVal (s, args, f, ret);
3059 }
3060 else
3061 {
3062 sRefSet mmods = context_modList ();
3063
3064 sRefSet_allElements (mmods, el)
3065 {
3066 if (sRef_isInternalState (el))
3067 {
3068 sRef_setModified (el);
3069 }
3070 } end_sRefSet_allElements ;
3071 }
3072 }
3073 else
3074 {
3075 exprNode_checkCallModifyVal (s, args, f, ret);
3076 }
3077 }
3078 else
3079 {
3080 sRef rb = sRef_getRootBase (s);
3081
28bf4b0b 3082 if (sRef_isFileOrGlobalScope (rb))
616915dd 3083 {
3084 context_usedGlobal (rb);
3085 }
3086
3087 if (sRef_isFileStatic (s)
3088 && !fileId_equal (fileloc_fileId (f->loc),
3089 fileloc_fileId (uentry_whereDefined (le))))
3090 {
3091 smods = sRefSet_insert (smods, s);
3092 }
3093 else
3094 {
3095 exprNode_checkCallModifyVal (s, args, f, ret);
3096 }
3097 }
3098 } end_sRefSet_allElements;
3099
3100 setCodePoint ();
3101
3102 /*
3103 ** Static elements in modifies set can have nasty consequences.
3104 ** (I think...have not been able to reproduce a possible bug.)
3105 */
3106
3107 if (!sRefSet_isDefined (smods))
3108 {
3109 mods = sRefSet_newCopy (mods);
3110 freshMods = TRUE;
3111
3112 sRefSet_allElements (smods, el)
3113 {
3114 bool res = sRefSet_delete (mods, el);
3115
3116 llassert (res);
3117 } end_sRefSet_allElements;
3118
3119 sRefSet_free (smods);
3120 /*@-branchstate@*/
3121 }
3122 /*@=branchstate@*/
3123 }
3124 else if (sRefSet_isDefined (mods))
3125 { /* just check observers */
3126 setCodePoint ();
3127
3128 sRefSet_allElements (mods, s) /* s is something which may be modified */
3129 {
3130 sRef rb = sRef_getRootBase (s);
3131
3132 setCodePoint ();
3133
3134 if (sRef_isParam (rb))
3135 {
3136 sRef b = sRef_fixBaseParam (s, args);
3137
3138 if (sRef_isObserver (b))
3139 {
51bc6ecc 3140 exprNode e = exprNodeList_nth (args, sRef_getParam (rb));
616915dd 3141
3142 if (optgenerror
3143 (FLG_MODOBSERVER,
3144 message ("Function call may modify observer%q: %s",
3145 sRef_unparsePreOpt (b), exprNode_unparse (e)),
3146 exprNode_loc (e)))
3147 {
3148 sRef_showExpInfo (b);
3149 }
3150 }
3151 }
3152 } end_sRefSet_allElements;
3153 }
3154 else
3155 {
3156 if (!hasMods) /* no specified modifications */
3157 {
3158 if (context_getFlag (FLG_MODOBSERVERUNCON))
3159 {
3160 exprNodeList_elements (args, e)
3161 {
3162 if (exprNode_isDefined (e))
3163 {
3164 sRef s = exprNode_getSref (e);
3165
3166 if (sRef_isObserver (s)
3167 && ctype_isMutable (sRef_getType (s)))
3168 {
3169 if (optgenerror
3170 (FLG_MODOBSERVERUNCON,
3171 message
3172 ("Call to unconstrained function %s may modify observer%q: %s",
3173 exprNode_unparse (f),
3174 sRef_unparsePreOpt (s), exprNode_unparse (e)),
3175 exprNode_loc (e)))
3176 {
3177 sRef_showExpInfo (s);
3178 }
3179 }
3180 }
3181 } end_exprNodeList_elements;
3182 }
3183 }
3184 }
3185
3186 checkAnyCall (f, fname, params, args, hasMods, mods, isSpec, specialArgs);
3187
3188 ret->uses = sRefSet_union (ret->uses, f->uses);
3189 ret->sets = sRefSet_union (ret->sets, f->sets);
3190 ret->msets = sRefSet_union (ret->msets, f->msets);
3191
3192 if (freshMods)
3193 {
3194 /*
1b8ae690 3195 ** Spurious errors reported, because splint can't tell
616915dd 3196 ** mods must be fresh if freshMods is true.
3197 */
3198
3199 /*@i@*/ sRefSet_free (mods);
3200 }
3201
3202 setCodePoint ();
3203}
3204
3205void checkGlobUse (uentry glob, bool isCall, /*@notnull@*/ exprNode e)
3206{
3207 if (uentry_isVar (glob))
3208 {
3209 if (context_inFunctionLike ())
3210 {
3211 sRef sr = uentry_getSref (glob);
3212
3213 context_usedGlobal (sr);
3214
3215 if (context_checkGlobUse (glob))
3216 {
3217 if (!context_globAccess (sr))
3218 {
3219 if (isCall)
3220 {
3221 voptgenerror
3222 (FLG_GLOBALS,
3223 message ("Called procedure %s may access %s %q",
3224 exprNode_unparse (e),
3225 sRef_unparseScope (sr),
3226 uentry_getName (glob)),
3227 e->loc);
3228 }
3229 else
3230 {
3231 voptgenerror
3232 (FLG_GLOBALS,
3233 message ("Undocumented use of %s %s",
3234 sRef_unparseScope (sr),
3235 exprNode_unparse (e)),
3236 e->loc);
3237 }
3238 }
3239 }
3240 }
3241 }
3242 else
3243 {
3244 llbug (message ("Global not variable: %q", uentry_unparse (glob)));
3245 }
3246}
3247
28bf4b0b 3248static void
ccf0a4a8 3249reflectEnsuresClause (exprNode ret, uentry le, exprNode f, exprNodeList args)
28bf4b0b 3250{
3251 DPRINTF (("Reflect ensures clause: %s(%s) / %s / %s",
3252 exprNode_unparse (f), exprNodeList_unparse (args),
3253 uentry_unparseFull (le),
3254 stateClauseList_unparse (uentry_getStateClauseList (le))));
3255
3256 if (uentry_isValid (le) && uentry_isFunction (le))
3257 {
3258 stateClauseList sclauses = uentry_getStateClauseList (le);
3259
3260 if (stateClauseList_isDefined (sclauses))
3261 {
3262 DPRINTF (("Reflect ensures: %s / %s / %s",
3263 uentry_unparse (le),
3264 exprNode_unparse (f), exprNodeList_unparse (args)));
3265
3266 stateClauseList_elements (sclauses, cl)
3267 {
3268 if (stateClause_hasEnsures (cl))
3269 {
3270 /* Same in usymtab.c:1904 */
3271 if (stateClause_setsMetaState (cl))
3272 {
3273 qual q = stateClause_getMetaQual (cl);
3274 annotationInfo ainfo = qual_getAnnotationInfo (q);
3275 metaStateInfo minfo = annotationInfo_getState (ainfo);
3276 cstring key = metaStateInfo_getName (minfo);
3277 int mvalue = annotationInfo_getValue (ainfo);
3278
3279 sRefSet osrs = sRefSet_undefined;
3280 sRefSet srs;
3281
3282 if (stateClause_isGlobal (cl))
3283 {
3284 srs = sRefSet_single (usymtab_lookupGlobalMarker ());
3285 osrs = srs;
3286 }
3287 else
3288 {
3289 srs = stateClause_getRefs (cl);
3290 }
3291
3292 DPRINTF (("Reflect ensures clause: %s", stateClause_unparse (cl)));
3293
3294
3295 DPRINTF (("Sets meta state! %s", stateClause_unparse (cl)));
3296
3297 sRefSet_elements (srs, sel)
3298 {
3299 sRef s;
3300
3301 if (sRef_isResult (sRef_getRootBase (sel)))
3302 {
ccf0a4a8 3303 s = exprNode_getSref (ret);
28bf4b0b 3304 }
3305 else
3306 {
3307 s = sRef_fixBaseParam (sel, args);
28bf4b0b 3308 }
ccf0a4a8 3309
3310 DPRINTF (("Reflecting state clause on: %s / %s",
3311 sRef_unparse (sel), sRef_unparse (s)));
3312
3313 sRef_setMetaStateValueComplete (s, key, mvalue, exprNode_loc (f));
28bf4b0b 3314 } end_sRefSet_elements;
3315
3316 sRefSet_free (osrs);
3317 }
3318 else
3319 {
3320 sRefSet srs = stateClause_getRefs (cl);
3321 sRefModVal modf = stateClause_getEnsuresFunction (cl);
3322 int eparam = stateClause_getStateParameter (cl);
abd7f895 3323
3324 llassert (modf != NULL);
3325
28bf4b0b 3326 DPRINTF (("Reflect after clause: %s / %s",
3327 stateClause_unparse (cl),
3328 sRefSet_unparse (srs)));
3329
3330 sRefSet_elements (srs, sel)
3331 {
3332 sRef s;
3333
3334 DPRINTF (("elements: %s", sRef_unparse (sel)));
3335 DPRINTF (("elements: %s", sRef_unparseFull (sel)));
3336
3337 if (sRef_isResult (sRef_getRootBase (sel)))
3338 {
ccf0a4a8 3339 DPRINTF (("Fix base: %s / %s",
3340 sRef_unparse (sel), sRef_unparse (exprNode_getSref (ret))));
3341 s = sRef_fixBase (sel, exprNode_getSref (ret));
3342 DPRINTF (("==> %s", sRef_unparseFull (s)));
28bf4b0b 3343 }
3344 else
3345 {
3346 s = sRef_fixBaseParam (sel, args);
28bf4b0b 3347 }
ccf0a4a8 3348
3349 DPRINTF (("elements: %s", sRef_unparse (s)));
3350 DPRINTF (("elements: %s", sRef_unparseFull (s)));
3351
3352 DPRINTF (("Reflecting state clause on: %s / %s",
1d239d69 3353 sRef_unparseFull (sel), sRef_unparseFull (s)));
ccf0a4a8 3354
1d239d69 3355 /* evans 2001-08-24 - added aliasSetCompleteParam */
3356 sRef_aliasSetCompleteParam (modf, s, eparam, exprNode_loc (f));
3357
3358 DPRINTF (("After reflecting state clause on: %s / %s",
3359 sRef_unparseFull (sel), sRef_unparseFull (s)));
28bf4b0b 3360 } end_sRefSet_elements;
3361 }
3362 }
ba45e1e4 3363 } end_stateClauseList_elements ;
3364 }
3365
3366 DPRINTF (("Here: %s / %s",
3367 uentry_unparseFull (le),
3368 bool_unparse (uentry_hasMetaStateEnsures (le))));
3369
3370 if (uentry_hasMetaStateEnsures (le))
3371 {
6970c11b 3372 fileloc loc = exprNode_loc (f);
3373
ccf0a4a8 3374 metaStateConstraintList mscl = uentry_getMetaStateEnsures (le);
3120b462 3375
ccf0a4a8 3376 metaStateConstraintList_elements (mscl, msc)
3120b462 3377 {
ccf0a4a8 3378 metaStateSpecifier msspec = metaStateConstraint_getSpecifier (msc);
3379 metaStateInfo msinfo = metaStateSpecifier_getMetaStateInfo (msspec);
3380 metaStateExpression msexpr = metaStateConstraint_getExpression (msc);
6970c11b 3381 cstring key = metaStateInfo_getName (msinfo);
ccf0a4a8 3382 sRef mlsr = metaStateSpecifier_getSref (msspec);
3383 sRef s;
3384 sRef lastref = sRef_undefined;
3385 stateValue sval = stateValue_undefined;
3386
3387 DPRINTF (("Meta state constraint for %s: %s", uentry_unparse (le),
3388 metaStateConstraint_unparse (msc)));
3389 DPRINTF (("Matches left: %s", sRef_unparseDebug (mlsr)));
3390
3391 if (sRef_isResult (sRef_getRootBase (mlsr)))
12f2ffe9 3392 {
ccf0a4a8 3393 s = exprNode_getSref (ret);
12f2ffe9 3394 }
3395 else
3396 {
ccf0a4a8 3397 s = sRef_fixBaseParam (mlsr, args);
12f2ffe9 3398 }
ccf0a4a8 3399
3400 DPRINTF (("Setting state: %s", sRef_unparseFull (s)));
3401
3402 while (metaStateExpression_isDefined (msexpr))
12f2ffe9 3403 {
ccf0a4a8 3404 metaStateSpecifier ms = metaStateExpression_getSpecifier (msexpr);
ccf0a4a8 3405 metaStateInfo msi = metaStateSpecifier_getMetaStateInfo (ms);
6970c11b 3406 sRef msr, fs;
3407
ccf0a4a8 3408 DPRINTF (("Check expression: %s", metaStateExpression_unparse (msexpr)));
3409
3410 if (metaStateExpression_isMerge (msexpr))
3411 {
3412 msexpr = metaStateExpression_getRest (msexpr);
3413 }
3414 else
3415 {
3416 msexpr = metaStateExpression_undefined;
3417 }
3418
3419 if (metaStateInfo_isDefined (msi))
3420 {
3421 /* Must match lhs state */
3422 llassert (metaStateInfo_equal (msinfo, msi));
3423 }
3424
6970c11b 3425 if (metaStateSpecifier_isElipsis (ms))
12f2ffe9 3426 {
6970c11b 3427 /*
3428 ** For elipsis, we need to merge all the relevant elipsis parameters
3429 **
3430 */
12f2ffe9 3431
6970c11b 3432 uentryList params = uentry_getParams (le);
3433 int paramno = uentryList_size (params) - 1;
3434
3435 if (!uentry_isElipsisMarker (uentryList_getN (params, paramno)))
12f2ffe9 3436 {
6970c11b 3437 voptgenerror
3438 (FLG_TYPE,
3439 message ("Ensures clauses uses ... for function without ... in parameter list: %q",
3440 uentry_getName (le)),
3441 uentry_whereLast (le));
3442 /*@innerbreak@*/ break;
3443 }
3444
3445 while (paramno < exprNodeList_size (args))
3446 {
3447 exprNode arg = exprNodeList_getN (args, paramno);
3448 fs = exprNode_getSref (arg);
3449 DPRINTF (("Merge arg: %s", exprNode_unparse (arg)));
3450
3451 /* cut and pasted... gack*/
3452 if (stateValue_isDefined (sval))
ccf0a4a8 3453 {
6970c11b 3454 /* Use combination table to merge old state value with new one: */
3455 stateValue tval = sRef_getMetaStateValue (fs, key);
ccf0a4a8 3456
6970c11b 3457 if (stateValue_isDefined (tval))
3458 {
3459 stateCombinationTable sctable = metaStateInfo_getMergeTable (msinfo);
3460 cstring msg = cstring_undefined;
3461 int nval = stateCombinationTable_lookup (sctable,
3462 stateValue_getValue (sval),
3463 stateValue_getValue (tval),
3464 &msg);
3465 DPRINTF (("Combining: %s + %s -> %d",
3466 stateValue_unparseValue (sval, msinfo),
3467 stateValue_unparseValue (tval, msinfo),
3468 nval));
3469
3470 if (nval == stateValue_error)
3471 {
6970c11b 3472 if (optgenerror
3473 (FLG_STATEMERGE,
3474 message
3475 ("Attributes merged in ensures clause in states that "
b7e84605 3476 "cannot be combined (%q is %q, %q is %q)%q",
6970c11b 3477 sRef_unparse (lastref),
3478 stateValue_unparseValue (sval, msinfo),
3479 sRef_unparse (fs),
3480 stateValue_unparseValue (tval, msinfo),
b7e84605 3481 cstring_isDefined (msg) ?
3482 message (": %s", msg) : cstring_undefined),
6970c11b 3483 exprNode_loc (f)))
3484 {
3485 sRef_showMetaStateInfo (fs, key);
3486 }
3487 }
3488
3489 stateValue_updateValueLoc (sval, nval, fileloc_undefined);
3490 loc = exprNode_loc (arg);
3491 }
3492 else
ccf0a4a8 3493 {
6970c11b 3494 DPRINTF (("No value for: %s:%s", sRef_unparse (fs), key));
3495 }
3496 }
3497 else
3498 {
3499 sval = sRef_getMetaStateValue (fs, key);
ccf0a4a8 3500 }
3501
6970c11b 3502 lastref = fs;
3503
3504 if (stateValue_isError (sval))
3505 {
3506 /*@innerbreak@*/ break; /* Don't merge any more values if here was an error */
3507 }
3508
3509
3510 paramno++;
ccf0a4a8 3511 }
3512 }
3513 else
3514 {
6970c11b 3515 msr = metaStateSpecifier_getSref (ms);
ccf0a4a8 3516
6970c11b 3517
3518 llassert (sRef_isParam (sRef_getRootBase (msr)));
3519 fs = sRef_fixBaseParam (msr, args);
3520
3521 if (stateValue_isDefined (sval))
3522 {
3523 /* Use combination table to merge old state value with new one: */
3524 stateValue tval = sRef_getMetaStateValue (fs, key);
3525
3526 if (stateValue_isDefined (tval))
3527 {
3528 stateCombinationTable sctable = metaStateInfo_getMergeTable (msinfo);
3529 cstring msg = cstring_undefined;
3530 int nval = stateCombinationTable_lookup (sctable,
3531 stateValue_getValue (sval),
3532 stateValue_getValue (tval),
3533 &msg);
3534 DPRINTF (("Combining: %s + %s -> %d",
3535 stateValue_unparseValue (sval, msinfo),
3536 stateValue_unparseValue (tval, msinfo),
3537 nval));
3538
3539 if (nval == stateValue_error)
3540 {
6970c11b 3541 if (optgenerror
3542 (FLG_STATEMERGE,
3543 message
3544 ("Attributes merged in ensures clause in states that "
b7e84605 3545 "cannot be combined (%q is %q, %q is %q)%q",
6970c11b 3546 sRef_unparse (lastref),
3547 stateValue_unparseValue (sval, msinfo),
3548 sRef_unparse (fs),
3549 stateValue_unparseValue (tval, msinfo),
b7e84605 3550 cstring_isDefined (msg)
3551 ? message (": %s", msg) : cstring_undefined),
6970c11b 3552 exprNode_loc (f)))
3553 {
3554 sRef_showMetaStateInfo (fs, key);
3555 }
3556 }
3557
3558 stateValue_updateValueLoc (sval, nval, fileloc_undefined);
3559 }
3560 else
3561 {
3562 DPRINTF (("No value for: %s:%s", sRef_unparse (fs), key));
3563 }
3564 }
3565 else
3566 {
3567 sval = sRef_getMetaStateValue (fs, key);
3568 }
3569
3570 lastref = fs;
3571
3572 if (stateValue_isError (sval))
3573 {
3574 /*@innerbreak@*/ break; /* Don't merge any more values if here was an error */
3575 }
12f2ffe9 3576 }
12f2ffe9 3577 }
6970c11b 3578
ccf0a4a8 3579 DPRINTF (("Setting: %s:%s <- %s", sRef_unparse (s), key, stateValue_unparse (sval)));
3580
3581 if (stateValue_isDefined (sval))
12f2ffe9 3582 {
6970c11b 3583 sRef_setMetaStateValueComplete (s, key, stateValue_getValue (sval), loc);
12f2ffe9 3584 }
ccf0a4a8 3585 else
12f2ffe9 3586 {
ccf0a4a8 3587 DPRINTF (("Undefined state: %s", cstring_toCharsSafe (sRef_unparse (s))));
12f2ffe9 3588 }
ccf0a4a8 3589 } end_metaStateConstraintList_elements ;
ba45e1e4 3590
ccf0a4a8 3591 metaStateConstraintList_free (mscl);
28bf4b0b 3592 }
3593 }
3594}
3595
3596static void
3597checkRequiresClause (uentry le, exprNode f, exprNodeList args)
3598{
3599 DPRINTF (("Check requires clause: %s(%s) / %s / %s",
3600 exprNode_unparse (f), exprNodeList_unparse (args),
3601 uentry_unparseFull (le),
3602 stateClauseList_unparse (uentry_getStateClauseList (le))));
3603
3604 if (uentry_isValid (le) && uentry_isFunction (le))
3605 {
3606 stateClauseList sclauses = uentry_getStateClauseList (le);
3607
3608 if (stateClauseList_isDefined (sclauses))
3609 {
3610 DPRINTF (("Check requires: %s / %s / %s",
3611 uentry_unparse (le),
3612 exprNode_unparse (f), exprNodeList_unparse (args)));
3613
3614 stateClauseList_elements (sclauses, cl)
3615 {
3616 DPRINTF (("Check clause: %s / %s",
3617 stateClause_unparse (cl),
3618 bool_unparse (stateClause_hasRequires (cl))));
3619
3620 if (stateClause_hasRequires (cl))
3621 {
3622 sRefSet osrs = sRefSet_undefined;
3623 sRefSet srs;
3624
3625 if (stateClause_isGlobal (cl))
3626 {
3627 srs = sRefSet_single (usymtab_lookupGlobalMarker ());
3628 osrs = srs;
3629 }
3630 else
3631 {
3632 srs = stateClause_getRefs (cl);
3633 }
3634
3635 DPRINTF (("Refs: %s", sRefSet_unparse (srs)));
3636
3637 if (stateClause_setsMetaState (cl))
3638 {
3639 qual q = stateClause_getMetaQual (cl);
3640 annotationInfo ainfo = qual_getAnnotationInfo (q);
3641 metaStateInfo minfo = annotationInfo_getState (ainfo);
3642 cstring key = metaStateInfo_getName (minfo);
3643 int mvalue = annotationInfo_getValue (ainfo);
3644
3645 DPRINTF (("Requires meta state! %s = %d", key, mvalue));
3646
3647 sRefSet_elements (srs, sel)
3648 {
3649 sRef s = sRef_fixBaseParam (sel, args);
3650
3651 if (sRef_isResult (sRef_getRootBase (sel)))
3652 {
ccf0a4a8 3653 BADBRANCH;
28bf4b0b 3654 }
3655 else
3656 {
3657 DPRINTF (("Checking state clause on: %s / %s / %s = %d",
3658 sRef_unparseFull (sel), sRef_unparseFull (s),
3659 key, mvalue));
3660
3661 if (!sRef_checkMetaStateValue (s, key, mvalue))
3662 {
3663 DPRINTF (("HERE: %s", sRef_unparse (s)));
3664 if (optgenerror
3665 (FLG_STATETRANSFER,
3666 message
990ec868 3667 ("Requires clause of called function %q not satisfied%q (state is %q): %q",
28bf4b0b 3668 uentry_getName (le),
3669 sRef_isGlobalMarker (s)
3670 ? message ("")
3671 : message (" by %q", sRef_unparse (s)),
3672 stateValue_unparseValue (sRef_getMetaStateValue (s, key),
3673 minfo),
3674 stateClause_unparse (cl)),
3675 exprNode_loc (f)))
3676 {
3677 sRef_showAliasInfo (s);
3678 }
3679 else
3680 {
3681 DPRINTF (("Error supressed!"));
3682 DPRINTF (("Loc: %s", fileloc_unparse (exprNode_loc (f))));
3683 DPRINTF (("Context supress: %s",
3684 bool_unparse (context_suppressFlagMsg (FLG_STATETRANSFER, exprNode_loc (f)))));
3685 }
3686 }
3687 }
3688 } end_sRefSet_elements;
3689 }
3690 else
3691 {
3692 sRefModVal modf = stateClause_getRequiresBodyFunction (cl);
3693 int eparam = stateClause_getStateParameter (cl);
3694
3695 DPRINTF (("Reflect after clause: %s / %s",
3696 stateClause_unparse (cl),
3697 sRefSet_unparse (srs)));
3698
abd7f895 3699 llassert (modf != NULL);
3700
28bf4b0b 3701 sRefSet_elements (srs, sel)
3702 {
3703 sRef s;
3704
3705 DPRINTF (("elements: %s", sRef_unparse (sel)));
3706 DPRINTF (("elements: %s", sRef_unparseFull (sel)));
3707
3708 s = sRef_fixBaseParam (sel, args);
3709
3710 DPRINTF (("elements: %s", sRef_unparse (s)));
3711 DPRINTF (("elements: %s", sRef_unparseFull (s)));
3712
3713 if (sRef_isResult (sRef_getRootBase (sel)))
3714 {
b73d1009 3715 ; /* what do we do about results? */
28bf4b0b 3716 }
3717 else
3718 {
3719 DPRINTF (("Reflecting state clause on: %s / %s",
3720 sRef_unparse (sel), sRef_unparse (s)));
3721
3722 modf (s, eparam, exprNode_loc (f));
3723 }
3724 } end_sRefSet_elements;
3725 }
3726
3727 sRefSet_free (osrs);
3728 }
3729 } end_stateClauseList_elements ;
3730 }
3731 }
3732}
3733
616915dd 3734static /*@only@*/ exprNode
3735functionCallSafe (/*@only@*/ /*@notnull@*/ exprNode f,
3736 ctype t, /*@keep@*/ exprNodeList args)
3737{
3738 /* requires f is a non-error exprNode, with type function */
3739 cstring fname = exprNode_unparse (f);
3740 uentry le = exprNode_getUentry (f);
3741 exprNode ret = exprNode_createPartialCopy (f);
3742 int special;
3743
3744 setCodePoint ();
28bf4b0b 3745
3746 DPRINTF (("Call: %s %s",exprNode_unparse (f), exprNodeList_unparse (args)));
3747
3748 ret->typ = ctype_getReturnType (t);
616915dd 3749 ret->kind = XPR_CALL;
3750
3751 ret->edata = exprData_makeCall (f, args);
3752
3753 /*
3754 ** Order of these steps is very important!
3755 **
3756 ** Must check for argument dependencies before messing up uses and sets.
3757 */
3758
3759 if (context_getFlag (FLG_EVALORDER))
3760 {
3761 exprNodeList_elements (args, current)
3762 {
3763 if (exprNode_isDefined (current))
3764 {
3765 exprNode_addUse (current, current->sref);
3766 }
3767 } end_exprNodeList_elements;
3768
3769 if (context_maybeSet (FLG_EVALORDER) || context_maybeSet (FLG_EVALORDERUNCON))
3770 {
3771 checkSequencing (f, args);
3772 }
3773
3774 exprNodeList_elements (args, current)
3775 {
3776 if (exprNode_isDefined (current) && sRef_isMeaningful (current->sref))
3777 {
3778 exprNode_addUse (ret, sRef_makeDerived (current->sref));
3779 }
3780 } end_exprNodeList_elements ;
3781 }
3782
3783 special = checkArgs (le, f, t, args, ret);
3784 checkGlobMods (f, le, args, ret, special);
28bf4b0b 3785 checkRequiresClause (le, f, args);
3786 setCodePoint ();
616915dd 3787
616915dd 3788 if (uentry_isValid (le)
3789 && (uentry_isFunction (le)
3790 || (uentry_isVariable (le)
3791 && ctype_isFunction (uentry_getType (le)))))
3792 {
3793 exitkind exk = uentry_getExitCode (le);
3794
3795 /* f->typ is already set to the return type */
3796
ccf0a4a8 3797 DPRINTF (("Function: %s", uentry_unparseFull (le)));
6fcd0b1e 3798 ret->sref = uentry_returnedRef (le, args, exprNode_loc (f));
28bf4b0b 3799 DPRINTF (("Returned: %s / %s",
3800 uentry_unparseFull (le),
3801 sRef_unparseFull (ret->sref)));
ccf0a4a8 3802
616915dd 3803 if (uentry_isFunction (le) && exprNodeList_size (args) >= 1)
3804 {
3805 qual nullPred = uentry_nullPred (le);
3806
3807 if (qual_isTrueNull (nullPred))
3808 {
3809 exprNode arg = exprNodeList_head (args);
3810
3811 if (exprNode_isDefined (arg))
3812 {
3813 ret->guards = guardSet_addFalseGuard (ret->guards, arg->sref);
3814 }
3815 }
3816 else if (qual_isFalseNull (nullPred))
3817 {
3818 exprNode arg = exprNodeList_head (args);
3819
3820 if (exprNode_isDefined (arg))
3821 {
3822 ret->guards = guardSet_addTrueGuard (ret->guards, arg->sref);
3823 }
3824 }
3825 else
3826 {
3827 llassert (qual_isUnknown (nullPred));
3828 }
3829 }
3830
3831 if (exitkind_isConditionalExit (exk))
3832 {
3833 /*
3834 ** True exit is:
3835 ** if (arg0) then { exit! } else { ; }
3836 ** False exit is:
3837 ** if (arg0) then { ; } else { exit! }
3838 */
3839
3840 exprNode firstArg;
3841
3842 llassert (!exprNodeList_isEmpty (args));
3843 firstArg = exprNodeList_head (args);
3844
3845 if (exprNode_isDefined (firstArg)
3846 && !guardSet_isEmpty (firstArg->guards))
3847 {
3848 usymtab_trueBranch (guardSet_undefined);
3849 usymtab_altBranch (guardSet_undefined);
3850
3851 if (exitkind_isTrueExit (exk))
3852 {
3853 usymtab_popBranches (firstArg,
3854 exprNode_makeMustExit (),
3855 exprNode_undefined,
3856 TRUE, TRUEEXITCLAUSE);
3857 }
3858 else
3859 {
3860 usymtab_popBranches (firstArg,
3861 exprNode_undefined,
3862 exprNode_makeMustExit (),
3863 TRUE, FALSEEXITCLAUSE);
3864 }
3865 }
3866
3867 ret->exitCode = XK_MAYEXIT;
3868 }
3869 else if (exitkind_mustExit (exk))
3870 {
3871 ret->exitCode = XK_MUSTEXIT;
3872 }
3873 else if (exitkind_couldExit (exk))
3874 {
3875 ret->exitCode = XK_MAYEXIT;
3876 }
3877 else
3878 {
3879 ;
3880 }
3881
3882 if (cstring_equalLit (fname, "exit"))
3883 {
3884 if (exprNodeList_size (args) == 1)
3885 {
3886 exprNode arg = exprNodeList_head (args);
3887
3888 if (exprNode_isDefined (arg) && exprNode_knownIntValue (arg))
3889 {
3890 long int val = multiVal_forceInt (exprNode_getValue (arg));
3891
3892 if (val != 0)
3893 {
3894 voptgenerror
3895 (FLG_EXITARG,
3896 message
3897 ("Argument to exit has implementation defined behavior: %s",
3898 exprNode_unparse (arg)),
3899 exprNode_loc (arg));
3900 }
3901 }
3902 }
3903 }
3904 }
3905 else
3906 {
02b84d4b 3907 ret->sref = sRef_undefined;
616915dd 3908 exprNode_checkSetAny (ret, uentry_rawName (le));
3909 }
3910
ccf0a4a8 3911 DPRINTF (("Before reflect: %s", sRef_unparseFull (ret->sref)));
3912 DPRINTF (("Reflect: %s", uentry_unparseFull (le)));
3913 reflectEnsuresClause (ret, le, f, args);
3914 setCodePoint ();
3915
6fcd0b1e 3916 DPRINTF (("Here: %s", sRef_unparseFull (ret->sref)));
616915dd 3917 return (ret);
3918}
3919
3920/*
3921** this is yucky! should keep the uentry as part of exprNode!
3922*/
3923
e83c79ec 3924uentry exprNode_getUentry (exprNode e)
616915dd 3925{
3926 if (exprNode_isError (e))
3927 {
3928 return uentry_undefined;
3929 }
3930 else
3931 {
3932 cstring s = exprNode_rootVarName (e);
3933 uentry ue = usymtab_lookupSafe (s);
3934
3935 return ue;
3936 }
3937}
3938
3e3ec469 3939/*
3940** Returns true iff e1 and e2 are both exactly the same storage
3941** (conservative).
3942*/
3943
3944static bool exprNode_sameStorage (exprNode e1, exprNode e2)
3945{
3946 sRef s1 = exprNode_getSref (e1);
3947 sRef s2 = exprNode_getSref (e2);
3948
3949 return (sRef_realSame (s1, s2));
3950}
3951
616915dd 3952exprNode
3953exprNode_makeInitBlock (lltok brace, /*@only@*/ exprNodeList inits)
3954{
3955 exprNode ret = exprNode_createPlain (ctype_unknown);
3956
3957 ret->kind = XPR_INITBLOCK;
3958 ret->edata = exprData_makeCall (exprNode_undefined, inits);
3959 ret->loc = fileloc_update (ret->loc, lltok_getLoc (brace));
3960
3961 return (ret);
3962}
3963
3964exprNode
3965exprNode_functionCall (/*@only@*/ exprNode f, /*@only@*/ exprNodeList args)
3966{
3967 ctype t;
3968
6483a926 3969# ifdef DEBUGSPLINT
3970 usymtab_checkAllValid ();
3971# endif
616915dd 3972
3973 if (exprNode_isUndefined (f))
3974 {
3975 exprNode_free (f);
3976 exprNodeList_free (args);
3977 return exprNode_undefined;
3978 }
3979
3980 t = exprNode_getType (f);
3981
3982 if (sRef_isLocalVar (f->sref))
3983 {
3984 exprNode_checkUse (f, f->sref, f->loc);
3985
3986 if (sRef_possiblyNull (f->sref))
3987 {
3988 if (!usymtab_isGuarded (f->sref))
3989 {
3990 if (optgenerror (FLG_NULLDEREF,
3991 message ("Function call using %s pointer %q",
3992 sRef_nullMessage (f->sref),
3993 sRef_unparse (f->sref)),
3994 f->loc))
3995 {
3996 sRef_showNullInfo (f->sref);
3997 sRef_setNullError (f->sref);
3998 }
3999 }
4000 }
4001 }
4002
4003 setCodePoint ();
4004
4005 if (ctype_isRealFunction (t))
4006 {
4007 exprNode ret = functionCallSafe (f, t, args);
4008 setCodePoint ();
4009 return ret;
4010 }
4011 else if (ctype_isUnknown (t))
4012 {
4013 exprNode ret = exprNode_createPartialCopy (f);
4014 cstring tstring;
4015
4016 setCodePoint ();
4017
4018 ret->typ = t;
4019 exprNodeList_elements (args, current)
4020 {
4021 if (exprNode_isDefined (current))
4022 {
4023 exprNode_checkUse (ret, current->sref, ret->loc);
4024
4025 /*
4026 ** also, anything derivable from current->sref may be used
4027 */
4028
4029 exprNode_addUse (ret, sRef_makeDerived (current->sref));
4030 exprNode_mergeUSs (ret, current);
4031 }
4032 } end_exprNodeList_elements;
4033
4034 ret->edata = exprData_makeCall (f, args);
4035 ret->kind = XPR_CALL;
4036
4037 tstring = cstring_copy (exprNode_unparse (f));
4038
4039 cstring_markOwned (tstring);
4040 exprNode_checkSetAny (ret, tstring);
4041
4042 return (ret);
4043 }
4044 else
4045 {
4046 voptgenerror (FLG_TYPE,
4047 message ("Call to non-function (type %t): %s", t,
4048 exprNode_unparse (f)),
4049 f->loc);
4050 exprNode_free (f);
4051 exprNodeList_free (args);
4052
4053 return (exprNode_makeError ());
4054 }
4055}
4056
28bf4b0b 4057static exprNode
4058exprNode_fieldAccessAux (/*@only@*/ exprNode s, /*@observer@*/ fileloc loc,
4059 /*@only@*/ cstring f)
616915dd 4060{
4061 exprNode ret = exprNode_createPartialCopy (s);
4062
4063 ret->kind = XPR_FACCESS;
4064
4065 if (exprNode_isError (s))
4066 {
4067 ret->edata = exprData_makeField (s, f);
4068 return ret;
4069 }
4070 else
4071 {
4072 ctype t = exprNode_getType (s);
4073 ctype tr = ctype_realType (t);
28bf4b0b 4074
616915dd 4075 checkMacroParen (s);
4076
4077 ret->edata = exprData_makeField (s, f);
28bf4b0b 4078
616915dd 4079 if (ctype_isStructorUnion (tr))
4080 {
4081 uentry tf = uentryList_lookupField (ctype_getFields (tr), f);
4082
4083 if (uentry_isUndefined (tf))
4084 {
4085 voptgenerror (FLG_TYPE,
4086 message ("Access non-existent field %s of %t: %s", f, t,
4087 exprNode_unparse (ret)),
28bf4b0b 4088 loc);
4089 /*! cstring_free (f); */ /* evans 2001-03-25 self-detect */
616915dd 4090 return (ret);
4091 }
4092 else
4093 {
4094 uentry_setUsed (tf, exprNode_loc (ret));
4095
4096 ret->typ = uentry_getType (tf);
4097 checkSafeUse (ret, s->sref);
4098
4099 ret->sref = sRef_makeField (s->sref, uentry_rawName (tf));
28bf4b0b 4100 /*!? exprNode_free (s); */ /* evans 2001-03-25 self-detect */
616915dd 4101 return (ret);
4102 }
4103 }
4104 else /* isStructorUnion */
4105 {
4106 if (ctype_isRealAbstract (tr))
4107 {
4108 voptgenerror
4109 (FLG_ABSTRACT,
4110 message ("Access field of abstract type (%t): %s.%s",
4111 t, exprNode_unparse (s), f),
28bf4b0b 4112 loc);
616915dd 4113 ret->typ = ctype_unknown;
4114 }
4115 else
4116 {
4117 if (ctype_isKnown (tr))
4118 {
4119 voptgenerror
4120 (FLG_TYPE,
4121 message
4122 ("Access field of non-struct or union (%t): %s.%s",
4123 t, exprNode_unparse (s), f),
28bf4b0b 4124 loc);
616915dd 4125
4126 ret->typ = ctype_unknown;
4127 }
4128 else
4129 {
4130 cstring sn = cstring_copy (f);
28bf4b0b 4131
616915dd 4132 checkSafeUse (ret, s->sref);
4133 cstring_markOwned (sn);
4134 ret->sref = sRef_makeField (s->sref, sn);
616915dd 4135 return (ret);
4136 }
4137 }
28bf4b0b 4138
616915dd 4139 return (ret);
4140 }
4141 }
4142 BADEXIT;
4143}
4144
28bf4b0b 4145exprNode
4146exprNode_fieldAccess (/*@only@*/ exprNode s, /*@only@*/ lltok dot,
4147 /*@only@*/ cstring f)
4148{
4149 exprNode res = exprNode_fieldAccessAux (s, lltok_getLoc (dot), f);
80489f0a 4150 lltok_free (dot);
28bf4b0b 4151 return res;
4152}
4153
616915dd 4154exprNode
4155exprNode_addParens (/*@only@*/ lltok lpar, /*@only@*/ exprNode e)
4156{
4157 exprNode ret = exprNode_createPartialCopy (e);
4158
4159 ret->loc = fileloc_update (ret->loc, lltok_getLoc (lpar));
4160 ret->kind = XPR_PARENS;
4161 ret->edata = exprData_makeUop (e, lpar);
4162
4163 if (!exprNode_isError (e))
4164 {
4165 ret->exitCode = e->exitCode;
4166 ret->canBreak = e->canBreak;
4167 ret->mustBreak = e->mustBreak;
4168 ret->isJumpPoint = e->isJumpPoint;
4169 ret->sref = e->sref;
4170 }
4171
4172 return ret;
4173}
4174
28bf4b0b 4175static exprNode
4176exprNode_arrowAccessAux (/*@only@*/ exprNode s, /*@observer@*/ fileloc loc,
4177 /*@only@*/ cstring f)
616915dd 4178{
4179 exprNode ret = exprNode_createPartialCopy (s);
4180
4181 ret->edata = exprData_makeField (s, f);
4182 ret->kind = XPR_ARROW;
28bf4b0b 4183
616915dd 4184 if (exprNode_isError (s))
4185 {
4186 return (ret);
4187 }
4188 else
4189 {
28bf4b0b 4190 ctype t = exprNode_getType (s);
4191 ctype tr = ctype_realType (t);
4192
4193 checkMacroParen (s);
4194
4195 (void) ctype_fixArrayPtr (tr); /* REWRITE THIS */
4196
4197 if (ctype_isRealPointer (tr))
4198 {
4199 ctype b = ctype_realType (ctype_baseArrayPtr (tr));
4200
4201 if (ctype_isStructorUnion (b))
4202 {
4203 uentry fentry = uentryList_lookupField (ctype_getFields (b), f);
4204
4205 if (sRef_isKnown (s->sref) && sRef_possiblyNull (s->sref))
4206 {
4207 if (!usymtab_isGuarded (s->sref) && !context_inProtectVars ())
4208 {
4209 if (optgenerror
4210 (FLG_NULLDEREF,
4211 message ("Arrow access from %s pointer%q: %s",
4212 sRef_nullMessage (s->sref),
4213 sRef_unparsePreOpt (s->sref),
4214 exprNode_unparse (ret)),
4215 loc))
4216 {
4217 sRef_showNullInfo (s->sref);
4218 sRef_setNullError (s->sref);
4219 }
4220 }
4221 }
4222
4223 if (uentry_isUndefined (fentry))
4224 {
4225 voptgenerror
4226 (FLG_TYPE,
4227 message ("Access non-existent field %s of %t: %s",
4228 f, t, exprNode_unparse (ret)),
4229 loc);
4230 ret->typ = ctype_unknown;
4231 return (ret);
4232 }
4233 else
4234 {
4235 /*
4236 ** was safeUse: shouldn't be safe!
4237 **
4238 ** to do rec->field
4239 ** rec must be defined,
4240 ** *rec must be allocated
4241 ** rec->field need only be defined it if is an rvalue
4242 */
4243
4244 uentry_setUsed (fentry, exprNode_loc (ret));
4245 ret->typ = uentry_getType (fentry);
4246
4247 exprNode_checkUse (ret, s->sref, s->loc);
4248
4249 /* exprNode_checkUse (ret, sRef_makePointer (s->sref), s->loc); */
4250 ret->sref = sRef_makeArrow (s->sref, uentry_rawName (fentry));
4251 return (ret);
4252 }
4253 }
4254 else /* Pointer to something that is not a struct or union*/
4255 {
4256 if (ctype_isRealAbstract (tr))
4257 {
4258 ctype xrt = ctype_forceRealType (tr);
4259
4260 voptgenerror
4261 (FLG_ABSTRACT,
4262 message ("Arrow access field of abstract type (%t): %s->%s",
4263 t, exprNode_unparse (s), f),
4264 loc);
4265
4266 /*
4267 ** Set the state correctly, as if the abstraction is broken.
4268 */
4269
4270 if (ctype_isRealPointer (xrt) &&
4271 (b = ctype_realType (ctype_baseArrayPtr (xrt)),
4272 ctype_isStructorUnion (b)))
4273 {
4274 uentry fentry = uentryList_lookupField (ctype_getFields (b), f);
4275 ret->typ = uentry_getType (fentry);
4276 ret->sref = sRef_makeArrow (s->sref, uentry_rawName (fentry));
4277 }
4278 else
4279 {
4280 ret->typ = ctype_unknown;
4281 ret->sref = sRef_undefined;
4282 }
4283 }
4284 else /* not a struct, union or abstract */
4285 {
4286 if (ctype_isUnknown (tr)) {
4287 cstring sn = cstring_copy (f);
4288
4289 DPRINTF (("Here: %s", exprNode_unparse (s)));
4290
4291 exprNode_checkUse (ret, s->sref, s->loc);
4292 exprNode_checkUse (ret, sRef_makePointer (s->sref), s->loc);
4293
4294 cstring_markOwned (sn);
4295 ret->sref = sRef_makeArrow (s->sref, sn);
4296
4297 ret->kind = XPR_ARROW;
4298 return (ret);
4299 } else {
4300 voptgenerror
4301 (FLG_TYPE,
4302 message ("Arrow access field of non-struct or union "
4303 "pointer (%t): %s->%s",
4304 t, exprNode_unparse (s), f),
4305 loc);
4306
4307 ret->typ = ctype_unknown;
4308 ret->sref = sRef_undefined;
4309 }
4310 }
4311 }
4312 }
4313 else /* its not a pointer */
4314 {
4315 if (!ctype_isUnknown (tr))
4316 {
4317 voptgenerror
4318 (FLG_TYPE,
4319 message ("Arrow access of non-pointer (%t): %s->%s",
4320 t, exprNode_unparse (s), f),
4321 loc);
4322
4323 ret->typ = ctype_unknown;
4324 ret->sref = sRef_undefined;
4325 }
4326 else
4327 {
4328 cstring sn = cstring_copy (f);
4329
4330 DPRINTF (("Here: %s", exprNode_unparse (s)));
4331
4332 exprNode_checkUse (ret, s->sref, s->loc);
4333 exprNode_checkUse (ret, sRef_makePointer (s->sref), s->loc);
4334
4335 cstring_markOwned (sn);
4336 ret->sref = sRef_makeArrow (s->sref, sn);
4337
4338 ret->kind = XPR_ARROW;
4339 return (ret);
4340 }
4341 }
4342
616915dd 4343 return (ret);
4344 }
4345 BADEXIT;
4346}
4347
28bf4b0b 4348exprNode
4349exprNode_arrowAccess (/*@only@*/ exprNode s,
4350 /*@only@*/ lltok arrow,
4351 /*@only@*/ cstring f)
4352{
4353 exprNode res = exprNode_arrowAccessAux (s, lltok_getLoc (arrow), f);
80489f0a 4354 lltok_free (arrow);
28bf4b0b 4355 return res;
4356}
4357
616915dd 4358/*
4359** only postOp's in C: i++ and i--
4360*/
4361
4362exprNode
4363exprNode_postOp (/*@only@*/ exprNode e, /*@only@*/ lltok op)
4364{
4365 /* check modification also */
4366 /* cstring opname = lltok_unparse (op);*/
4367 ctype t;
4368 exprNode ret = exprNode_createPartialCopy (e);
4369
4370 ret->loc = fileloc_update (ret->loc, lltok_getLoc (op));
4371 ret->kind = XPR_POSTOP;
4372 ret->edata = exprData_makeUop (e, op);
4373
4374 if (!exprNode_isDefined (e))
4375 {
4376 return ret;
4377 }
4378
4379 checkMacroParen (e);
4380
4381 exprNode_checkUse (ret, e->sref, e->loc);
4382 exprNode_checkSet (ret, e->sref);
4383
4384 t = exprNode_getType (e);
4385
4386 if (sRef_isUnsafe (e->sref))
4387 {
4388 voptgenerror (FLG_MACROPARAMS,
4389 message ("Operand of %s is macro parameter (non-functional): %s%s",
4390 lltok_unparse (op), exprNode_unparse (e), lltok_unparse (op)),
4391 e->loc);
4392 sRef_makeSafe (e->sref);
4393 sRef_makeSafe (ret->sref);
4394 }
4395
4396 if (ctype_isForceRealNumeric (&t) || ctype_isRealAP (t))
4397 {
4398 ret->typ = e->typ;
4399 }
4400 else
4401 {
4402 if (ctype_isRealAbstract (t))
4403 {
e5081f8c 4404 if (ctype_isRealNumAbstract (t)) {
4405 ; /* Allow operations on numabstract types */
4406 } else {
4407 voptgenerror
4408 (FLG_ABSTRACT,
4409 message ("Operand of %s is abstract type (%t): %s",
4410 lltok_unparse (op), t, exprNode_unparse (e)),
4411 e->loc);
4412 }
616915dd 4413 }
4414 else
4415 {
4416 voptgenerror
4417 (FLG_TYPE,
4418 message ("Operand of %s is non-numeric (%t): %s",
4419 lltok_unparse (op), t, exprNode_unparse (e)),
4420 e->loc);
4421 }
4422 ret->typ = ctype_unknown;
4423 }
4424
4425 /* if (ctype_isZero (t)) e->typ = ctype_int; */
4426
4427 exprNode_checkModify (e, ret);
4428
4429 /* added 7/11/2000 D.L */
84c9ffbf 4430
b7b694d6 4431 /* updateEnvironmentForPostOp (e); */
4432
4433 /* start modifications */
4434 /* added by Seejo on 4/16/2000 */
4435
4436 /* Arithmetic operations on pointers wil modify the size/len/null terminated
4437 status */
4438 if ((sRef_isPossiblyNullTerminated (e->sref)) || (sRef_isNullTerminated(e->sref))) {
4439
4440 ret->sref = sRef_copy (e->sref);
4441
4442 /* Operator : ++ */
4443 if (lltok_getTok (op) == INC_OP) {
4444 if (sRef_getSize(e->sref) > 0) {
4445
4446 sRef_setSize (ret->sref, sRef_getSize(e->sref) - 1);
4447
4448 if (sRef_getLen(e->sref) == 1) { /* i.e. the first character is \0 */
4449 /* Assumption: there is only 1 \0 in the buffer */
4450 /* This will not be correct if there are 2 \0's in the buffer */
4451 sRef_setNotNullTerminatedState(ret->sref);
4452 sRef_resetLen(ret->sref);
4453 } else {
4454 sRef_setNullTerminatedState(ret->sref);
4455 sRef_setLen (ret->sref, sRef_getLen(e->sref) - 1);
4456 }
4457 if (sRef_isNullTerminated (ret->sref))
4458 printf ("ret->sref is Null Terminated\n");
4459 else if (sRef_isPossiblyNullTerminated (ret->sref))
4460 printf ("ret->sref is Possibly Null Terminated\n");
4461 else if (sRef_isNotNullTerminated (ret->sref))
4462 printf ("ret->sref is Not Null Terminated\n");
b941db6b 4463 else
4464 {}
b7b694d6 4465 }
4466 }
4467
4468 /* Operator : -- */
4469 if (lltok_getTok (op) == DEC_OP) {
4470 if (sRef_getSize(e->sref) >= 0) {
4471 sRef_setSize (ret->sref, sRef_getSize(e->sref) + 1);
4472 sRef_setLen (ret->sref, sRef_getLen(e->sref) + 1);
4473 }
4474 }
4475 }
b7b694d6 4476 /* end modifications */
616915dd 4477
4478 return ret;
4479}
4480
4481exprNode
4482exprNode_preOp (/*@only@*/ exprNode e, /*@only@*/ lltok op)
4483{
4484 bool checkMod = FALSE;
4485 ctype te, tr;
4486 int opid = lltok_getTok (op);
4487 exprNode ret = exprNode_createSemiCopy (e);
4488
4489 exprNode_copySets (ret, e);
4490
4491 multiVal_free (ret->val);
4492 ret->val = multiVal_undefined;
4493 ret->loc = fileloc_update (ret->loc, lltok_getLoc (op));
4494 ret->kind = XPR_PREOP;
4495 ret->edata = exprData_makeUop (e, op);
4496
4497 if (exprNode_isError (e))
4498 {
4499 return ret;
4500 }
4501
4502 checkMacroParen (e);
4503
4504 te = exprNode_getType (e);
4505 tr = ctype_realType (te);
4506
4507 if (opid != TAMPERSAND)
4508 {
4509 exprNode_checkUse (ret, e->sref, e->loc);
4510
4511 if (ctype_isRealAbstract (tr)
4512 && (!(ctype_isRealBool (te) && (opid == TEXCL))))
4513 {
e5081f8c 4514 if (ctype_isRealNumAbstract (tr))
616915dd 4515 {
e5081f8c 4516 ; /* no warning for numabstract types */
4517 }
4518 else
4519 {
4520 if (optgenerror (FLG_ABSTRACT,
4521 message ("Operand of %s is abstract type (%t): %s",
4522 lltok_unparse (op), tr,
4523 exprNode_unparse (ret)),
4524 e->loc))
4525 {
4526 tr = te = ctype_unknown;
4527 ret->typ = ctype_unknown;
4528 sRef_setNullError (e->sref);
4529 }
616915dd 4530 }
4531 }
4532 }
4533
4534 switch (opid)
4535 {
4536 case INC_OP:
4537 case DEC_OP: /* should also check modification! */
616915dd 4538 if (sRef_isMacroParamRef (e->sref))
4539 {
4540 voptgenerror
4541 (FLG_MACROPARAMS,
4542 message ("Operand of %s is macro parameter (non-functional): %s",
4543 lltok_unparse (op), exprNode_unparse (ret)),
4544 e->loc);
4545 }
4546 else
4547 {
4548 exprNode_checkSet (ret, e->sref);
4549 }
4550
4551 if (ctype_isForceRealNumeric (&tr) || ctype_isRealAP (tr))
4552 {
4553 }
4554 else
4555 {
4556 if (context_msgStrictOps ())
4557 {
4558 voptgenerror
4559 (FLG_STRICTOPS,
4560 message ("Operand of %s is non-numeric (%t): %s",
4561 lltok_unparse (op), te, exprNode_unparse (ret)),
4562 e->loc);
4563 }
4564 ret->typ = ctype_int;
4565 }
4566
4567 /* start modifications */
4568 /* added by Seejo on 4/16/2000 */
4569
4570 /* Arithmetic operations on pointers wil modify the size/len/null terminated
4571 status */
e5081f8c 4572 if ((sRef_isPossiblyNullTerminated (e->sref))
4573 || (sRef_isNullTerminated(e->sref))) {
616915dd 4574 ret->sref = sRef_copy (e->sref);
4575
4576 /* Operator : ++ */
4577 if (lltok_getTok (op) == INC_OP) {
4578 if (sRef_getSize(e->sref) > 0) {
4579
4580 sRef_setSize (ret->sref, sRef_getSize(e->sref) - 1);
4581
4582 if (sRef_getLen(e->sref) == 1) { /* i.e. the first character is \0 */
4583 /* Assumption: there is only 1 \0 in the buffer */
4584 /* This will not be correct if there are 2 \0's in the buffer */
4585 sRef_setNotNullTerminatedState(ret->sref);
4586 sRef_resetLen (ret->sref);
4587 } else {
4588 sRef_setNullTerminatedState(ret->sref);
4589 sRef_setLen (ret->sref, sRef_getLen(e->sref) - 1);
4590 }
4591 }
4592 }
4593
4594 /* Operator : -- */
4595 if (lltok_getTok (op) == DEC_OP) {
4596 if (sRef_getSize(e->sref) >= 0) {
4597 sRef_setSize (ret->sref, sRef_getSize(e->sref) + 1);
4598 sRef_setLen (ret->sref, sRef_getLen(e->sref) + 1);
4599 }
4600 }
4601 }
4602
4603 /* end modifications */
4604
4605 checkMod = TRUE;
4606 break;
4607
4608 case TMINUS:
4609 case TPLUS:
4610 if (ctype_isForceRealNumeric (&tr))
4611 {
4612 if (opid == TMINUS)
4613 {
4614 ret->val = multiVal_invert (exprNode_getValue (e));
4615 }
4616 else
4617 {
4618 ret->val = multiVal_copy (exprNode_getValue (e));
4619 }
4620 }
4621 else
4622 {
4623 if (context_msgStrictOps ())
4624 {
4625 voptgenerror
4626 (FLG_STRICTOPS,
4627 message ("Operand of %s is non-numeric (%t): %s",
4628 lltok_unparse (op), te, exprNode_unparse (ret)),
4629 e->loc);
4630 }
4631
4632 ret->typ = ctype_int;
4633 }
4634 break;
4635
4636 case TEXCL: /* maybe this should be restricted */
4637 guardSet_flip (ret->guards);
4638
28bf4b0b 4639 if (ctype_isRealBool (te) || ctype_isUnknown (te))
616915dd 4640 {
4641 ;
4642 }
4643 else
4644 {
4645 if (ctype_isRealPointer (tr))
4646 {
4647 if (sRef_isKnown (e->sref))
4648 {
4649 ret->guards = guardSet_addFalseGuard (ret->guards, e->sref);
4650 }
28bf4b0b 4651
616915dd 4652 voptgenerror2n
4653 (FLG_BOOLOPS, FLG_PTRNEGATE,
4654 message ("Operand of %s is non-boolean (%t): %s",
4655 lltok_unparse (op), te, exprNode_unparse (ret)),
4656 e->loc);
4657 }
4658 else
4659 {
4660 voptgenerror
4661 (FLG_BOOLOPS,
4662 message ("Operand of %s is non-boolean (%t): %s",
4663 lltok_unparse (op), te, exprNode_unparse (ret)),
4664 e->loc);
4665 }
4666
4667 ret->typ = ctype_bool;
4668 }
4669 break;
4670
4671 case TTILDE:
4672 if (ctype_isForceRealInt (&tr))
4673 {
4674 }
4675 else
4676 {
4677 if (context_msgStrictOps ())
4678 {
4679 voptgenerror
4680 (FLG_STRICTOPS,
4681 message ("Operand of %s is non-integer (%t): %s",
4682 lltok_unparse (op), te, exprNode_unparse (ret)),
4683 e->loc);
4684 }
4685
4686 if (ctype_isInt (e->typ))
4687 {
4688 ret->typ = e->typ;
4689 }
4690 else
4691 {
4692 ret->typ = ctype_int;
4693 }
4694 }
4695 break;
4696
4697 case TAMPERSAND:
4698 ret->typ = ctype_makePointer (e->typ);
4699
4700 if (sRef_isKnown (e->sref))
4701 {
4702 ret->sref = sRef_makeAddress (e->sref);
4703 }
4704
4705 break;
4706
4707 case TMULT:
4708
4709 if (ctype_isAP (tr))
4710 {
4711 ret->typ = ctype_baseArrayPtr (e->typ);
4712 }
4713 else
4714 {
4715 if (ctype_isKnown (te))
4716 {
4717 if (ctype_isFunction (te))
4718 {
4719 ret->typ = e->typ;
4720
4721 voptgenerror
4722 (FLG_FCNDEREF,
4723 message ("Dereference of function type (%t): %s",
4724 te, exprNode_unparse (ret)),
4725 e->loc);
4726 }
4727 else
4728 {
4729 voptgenerror (FLG_TYPE,
4730 message ("Dereference of non-pointer (%t): %s",
4731 te, exprNode_unparse (ret)),
4732 e->loc);
4733 ret->typ = ctype_unknown;
4734 }
4735 }
4736 else
4737 {
4738 ret->typ = ctype_unknown;
4739 }
4740
4741 }
4742
4743 if (sRef_isKnown (e->sref))
4744 {
2209bcb7 4745 DPRINTF (("Checking possibly null: %s", sRef_unparseFull (e->sref)));
4746
616915dd 4747 if (sRef_possiblyNull (e->sref))
4748 {
2209bcb7 4749 DPRINTF (("Checking possibly null: %s", sRef_unparse (e->sref)));
616915dd 4750 if (!usymtab_isGuarded (e->sref) && !context_inProtectVars ())
4751 {
4752 if (optgenerror
4753 (FLG_NULLDEREF,
4754 message ("Dereference of %s pointer %q: %s",
4755 sRef_nullMessage (e->sref),
4756 sRef_unparse (e->sref),
4757 exprNode_unparse (ret)),
4758 e->loc))
4759 {
4760 sRef_showNullInfo (e->sref);
4761 sRef_setNotNull (e->sref, e->loc); /* suppress future messages */
4762 }
4763 }
4764 }
4765
4766 ret->sref = sRef_makePointer (e->sref);
4767 }
4768 break;
4769
4770 default:
4771 llbug (message ("exprNode_preOp: unhandled op: %s", lltok_unparse (op)));
4772 }
4773
4774 if (checkMod)
4775 {
4776 exprNode_checkModify (e, ret);
4777 }
4778
4779 return ret;
4780}
4781
4782/*
4783** any reason to disallow sizeof (abstract type) ?
4784*/
4785
4786/*
4787** used by both sizeof
4788*/
4789
4790static
4791ctype sizeof_resultType (void)
4792{
4793 static ctype sizet = ctype_unknown;
4794
4795 if (ctype_isUnknown (sizet))
4796 {
4797 if (usymtab_existsType (cstring_makeLiteralTemp ("size_t")))
4798 {
4799 sizet = uentry_getAbstractType (usymtab_lookup (cstring_makeLiteralTemp ("size_t")));
4800 }
4801 else
4802 {
e0b363ad 4803 sizet = ctype_ulint;
616915dd 4804 }
4805 }
4806 return sizet;
4807}
4808
4809exprNode
4810exprNode_sizeofType (/*@only@*/ qtype qt)
4811{
4812 exprNode ret = exprNode_create (sizeof_resultType ());
4813 ctype ct = qtype_getType (qt);
4814
4815 ret->kind = XPR_SIZEOFT;
4816 ret->edata = exprData_makeSizeofType (qt);
4817
4818 voptgenerror (FLG_SIZEOFTYPE,
4819 message ("Parameter to sizeof is type %s: %s",
4820 ctype_unparse (ct),
4821 exprNode_unparse (ret)),
4822 ret->loc);
4823
4824 return (ret);
4825}
4826
4827exprNode
4828exprNode_alignofType (/*@only@*/ qtype qt)
4829{
4830 exprNode ret = exprNode_create (sizeof_resultType ());
4831 ctype ct = qtype_getType (qt);
4832
4833 ret->kind = XPR_ALIGNOFT;
4834 ret->edata = exprData_makeSizeofType (qt);
4835
4836 voptgenerror (FLG_SIZEOFTYPE,
4837 message ("Parameter to alignof is type %s: %s",
4838 ctype_unparse (ct),
4839 exprNode_unparse (ret)),
4840 ret->loc);
4841
4842 return (ret);
4843}
4844
4845exprNode exprNode_offsetof (qtype qt, cstringList s)
4846{
4847 exprNode ret = exprNode_create (sizeof_resultType ());
4848 ctype ct = qtype_getType (qt);
4849
4850 ret->kind = XPR_OFFSETOF;
4851 ret->edata = exprData_makeOffsetof (qt, s);
4852
4853 if (!ctype_isRealSU (ct))
4854 {
4855 voptgenerror (FLG_TYPE,
4856 message ("First parameter to offsetof is not a "
4857 "struct or union type (type %s): %s",
4858 ctype_unparse (ct),
4859 exprNode_unparse (ret)),
4860 ret->loc);
4861 }
4862 else
4863 {
4864 ctype lt = ct;
4865
4866 cstringList_elements (s, el) {
4867 uentryList fields;
4868 uentry fld;
4869
4870 if (ctype_isUndefined (lt))
4871 {
4872 break;
4873 }
4874 else if (!ctype_isRealSU (lt))
4875 {
4876 voptgenerror (FLG_TYPE,
4877 message ("Inner offsetof type is not a "
4878 "struct or union type (type %s before field %s): %s",
4879 ctype_unparse (lt), el,
4880 exprNode_unparse (ret)),
4881 ret->loc);
4882 break;
4883 }
4884 else
4885 {
4886 fields = ctype_getFields (ctype_realType (lt));
4887 fld = uentryList_lookupField (fields, el);
4888 DPRINTF (("Try: %s / %s", ctype_unparse (lt), el));
4889
4890 if (uentry_isUndefined (fld))
4891 {
4892 if (ctype_equal (lt, ct)) {
4893 voptgenerror (FLG_TYPE,
4894 message ("Field %s in offsetof is not the "
4895 "name of a field of %s: %s",
4896 el,
4897 ctype_unparse (ct),
4898 exprNode_unparse (ret)),
4899 ret->loc);
4900 } else {
4901 voptgenerror (FLG_TYPE,
4902 message ("Deep field %s in offsetof is not the "
4903 "name of a field of %s: %s",
4904 el,
4905 ctype_unparse (lt),
4906 exprNode_unparse (ret)),
4907 ret->loc);
4908 }
4909 }
4910 else
4911 {
4912 lt = uentry_getType (fld);
4913 }
4914 }
4915 } end_cstringList_elements;
4916
4917 /* Should report error if its a bit field - behavior is undefined! */
4918 }
4919
4920 return (ret);
4921}
4922
4923/*@only@*/ exprNode
4924exprNode_sizeofExpr (/*@only@*/ exprNode e)
4925{
4926 exprNode ret;
4927
4928 if (exprNode_isUndefined (e))
4929 {
4930 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
4931 ret->edata = exprData_makeSingle (e);
4932 ret->typ = sizeof_resultType ();
4933 ret->kind = XPR_SIZEOF;
4934 }
4935 else
4936 {
4937 uentry u = exprNode_getUentry (e);
4938
4939 ret = exprNode_createPartialCopy (e);
4940 ret->edata = exprData_makeSingle (e);
4941
4942 ret->typ = sizeof_resultType ();
4943 ret->kind = XPR_SIZEOF;
4944
4945 if (uentry_isValid (u)
4946 && uentry_isRefParam (u)
4947 && ctype_isRealArray (uentry_getType (u)))
4948 {
4949 voptgenerror
4950 (FLG_SIZEOFFORMALARRAY,
4951 message ("Parameter to sizeof is an array-type function parameter: %s",
4952 exprNode_unparse (ret)),
4953 ret->loc);
4954 }
4955 }
4956
4957 /*
4958 ** sizeof (x) doesn't "really" use x
4959 */
4960
4961 return (ret);
4962}
4963
4964/*@only@*/ exprNode
4965exprNode_alignofExpr (/*@only@*/ exprNode e)
4966{
4967 exprNode ret;
4968
4969 if (exprNode_isUndefined (e))
4970 {
4971 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
4972 }
4973 else
4974 {
4975 ret = exprNode_createPartialCopy (e);
4976 }
4977
4978 ret->edata = exprData_makeSingle (e);
4979 ret->typ = sizeof_resultType ();
4980 ret->kind = XPR_ALIGNOF;
4981
4982 /*
4983 ** sizeof (x) doesn't "really" use x
4984 */
4985
4986 return (ret);
4987}
4988
4989/*@only@*/ exprNode
4990exprNode_cast (/*@only@*/ lltok tok, /*@only@*/ exprNode e, /*@only@*/ qtype q)
4991{
4992 ctype c;
4993 ctype t;
4994 exprNode ret;
4995
4996 if (exprNode_isError (e))
4997 {
4998 qtype_free (q);
80489f0a 4999 lltok_free (tok);
616915dd 5000 return exprNode_undefined;
5001 }
5002
5003 checkMacroParen (e);
5004
5005 c = qtype_getType (q);
5006 t = exprNode_getType (e);
5007
5008 ret = exprNode_createPartialCopy (e);
5009
5010 ret->loc = fileloc_update (ret->loc, lltok_getLoc (tok));
5011 ret->typ = c;
5012 ret->kind = XPR_CAST;
5013 ret->edata = exprData_makeCast (tok, e, q);
5014
02b84d4b 5015 ret->sref = sRef_copy (e->sref);
6fcd0b1e 5016
ae133592 5017 DPRINTF (("Cast: -> %s", sRef_unparseFull (ret->sref)));
5018
02b84d4b 5019 if (!sRef_isConst (e->sref))
616915dd 5020 {
616915dd 5021 usymtab_addForceMustAlias (ret->sref, e->sref);
616915dd 5022 }
02b84d4b 5023
6fcd0b1e 5024 DPRINTF (("Cast 2: -> %s", sRef_unparseFull (ret->sref)));
02b84d4b 5025 sRef_setTypeFull (ret->sref, c);
5026 DPRINTF (("Cast 2: -> %s", sRef_unparseFull (ret->sref)));
616915dd 5027
5028 /*
5029 ** we allow
5030 ** abstract -> void
5031 ** 0 <-> abstract *
5032 ** void * <-> abstract * (if FLG_ABSTVOIDP)
5033 ** abstract * <-> void * (if FLG_ABSTVOIDP)
5034 */
5035
5036 if (ctype_isVoid (c)) /* cast to void is always okay --- discard value */
5037 {
6fcd0b1e 5038 /* evans 2002-07-19: added this warning */
5039 DPRINTF (("Checking: %s / %s", exprNode_unparse (ret), sRef_unparseFull (ret->sref)));
5040 if (sRef_isFresh (ret->sref))
5041 {
5042 voptgenerror
5043 (FLG_MUSTFREEFRESH,
5044 message ("New fresh storage %q(type %s) cast to void (not released): %s",
5045 sRef_unparseOpt (ret->sref),
5046 ctype_unparse (exprNode_getType (ret)),
5047 exprNode_unparse (ret)),
5048 exprNode_loc (ret));
5049 }
616915dd 5050 }
5051 else if (ctype_isRealAP (c)) /* casting to array or pointer */
5052 {
5053 ctype bc = ctype_getBaseType (c);
5054 ctype bt = ctype_getBaseType (t);
5055 ctype rt = ctype_realType (t);
5056
5057 if (ctype_isFunction (ctype_baseArrayPtr (ctype_realType (c)))
5058 && (ctype_isArrayPtr (rt)
5059 && !ctype_isFunction (ctype_realType (ctype_baseArrayPtr (rt)))))
5060 {
5061 voptgenerror
5062 (FLG_CASTFCNPTR,
5063 message ("Cast from function pointer type (%t) to "
5064 "non-function pointer (%t): %s",
5065 c, t, exprNode_unparse (ret)),
5066 e->loc);
5067 }
5068
5069 if (!ctype_isFunction (ctype_baseArrayPtr (c))
5070 && (ctype_isArrayPtr (rt)
5071 && ctype_isFunction (ctype_realType (ctype_baseArrayPtr (rt)))))
5072 {
5073 voptgenerror
5074 (FLG_CASTFCNPTR,
5075 message ("Cast from non-function pointer type (%t) to "
5076 "function pointer (%t): %s",
5077 c, t, exprNode_unparse (ret)),
5078 e->loc);
5079 }
5080
5081 if (exprNode_isZero (e) && context_getFlag (FLG_ZEROPTR) &&
5082 !(ctype_isRealAbstract (bc)
5083 && context_hasAccess (ctype_typeId (bc))))
5084 {
5085 ; /* okay to cast zero */
5086 }
5087 else
5088 {
5089 if (ctype_isRealAbstract (bc)
5090 && !context_hasAccess (ctype_typeId (bc)))
5091 {
5092 if (ctype_isVoidPointer (t) || ctype_isUnknown (t))
5093 {
5094 vnoptgenerror
5095 (FLG_ABSTVOIDP,
5096 message ("Cast to underlying abstract type %t: %s",
5097 c, exprNode_unparse (ret)),
5098 e->loc);
5099 }
5100 else
5101 {
5102 voptgenerror
5103 (FLG_ABSTRACT,
5104 message ("Cast to underlying abstract type %t: %s",
5105 c, exprNode_unparse (ret)),
5106 e->loc);
5107 }
5108 }
5109
5110 if (ctype_isRealAbstract (bt)
5111 && !context_hasAccess (ctype_typeId (bt)))
5112 {
5113 if (ctype_isUnknown (c) || ctype_isVoidPointer (c))
5114 {
5115 vnoptgenerror
5116 (FLG_ABSTVOIDP,
5117 message ("Cast from underlying abstract type %t: %s",
5118 t, exprNode_unparse (ret)),
5119 e->loc);
5120 }
5121 else
5122 {
5123 voptgenerror
5124 (FLG_ABSTRACT,
5125 message ("Cast from underlying abstract type %t: %s",
5126 t, exprNode_unparse (ret)),
5127 e->loc);
5128 }
5129 }
5130 }
5131 }
5132 else
5133 {
5134 ctype bt = ctype_realType (ctype_getBaseType (t));
5135 ctype bc = ctype_realType (ctype_getBaseType (c));
5136
5137 if (ctype_isAbstract (bt) && !context_hasAccess (ctype_typeId (bt)))
5138 {
5139 if (ctype_match (c, t))
5140 {
5141 if (ctype_equal (c, t))
5142 {
5143 voptgenerror
5144 (FLG_TYPE,
5145 message ("Redundant cast involving abstract type %t: %s",
5146 bt, exprNode_unparse (ret)),
5147 e->loc);
5148 }
5149 }
5150 else
5151 {
5152 voptgenerror
5153 (FLG_ABSTRACT,
5154 message ("Cast from abstract type %t: %s",
5155 bt, exprNode_unparse (ret)),
5156 e->loc);
5157 }
5158 }
5159
5160 if (ctype_isAbstract (bc)
5161 && !context_hasAccess (ctype_typeId (bc)))
5162 {
5163 if (ctype_match (c, t))
5164 {
5165 ;
5166 }
5167 else
5168 {
e5081f8c 5169 if (ctype_isNumAbstract (bc))
5170 {
5171 if (exprNode_isNumLiteral (e))
5172 {
5173 voptgenerror
5174 (FLG_NUMABSTRACTCAST,
5175 message ("Cast from literal to numabstract type %t: %s", bc,
5176 exprNode_unparse (ret)),
5177 e->loc);
5178 }
5179 else
5180 {
5181 voptgenerror
5182 (FLG_NUMABSTRACT,
5183 message ("Cast to numabstract type %t: %s", bc,
5184 exprNode_unparse (ret)),
5185 e->loc);
5186 }
5187 }
5188 else
5189 {
5190 DPRINTF (("No access to: %s / %d",
5191 ctype_unparse (bc), ctype_typeId (bc)));
5192 DPRINTF (("Context %s %s",
5193 bool_unparse (context_inFunctionLike ()),
5194 context_unparse ()));
5195 voptgenerror
5196 (FLG_ABSTRACT,
5197 message ("Cast to abstract type %t: %s", bc,
5198 exprNode_unparse (ret)),
5199 e->loc);
5200 }
616915dd 5201 }
5202 }
5203 }
5204
5205 if (ctype_isAbstract (c))
5206 {
5207 if (sRef_isExposed (e->sref) || sRef_isOnly (e->sref))
5208 {
5209 /* okay, cast exposed to abstract */
5210 sRef_clearExKindComplete (ret->sref, fileloc_undefined);
5211 }
5212 else
5213 {
5214 if (ctype_isVisiblySharable (t)
5215 && sRef_isExternallyVisible (e->sref)
5216 && !(ctype_isAbstract (t)
5217 && context_hasAccess (ctype_typeId (t))))
5218 {
5219 voptgenerror
5220 (FLG_CASTEXPOSE,
5221 message ("Cast to abstract type from externally visible "
5222 "mutable storage exposes rep of %s: %s",
5223 ctype_unparse (c),
5224 exprNode_unparse (e)),
5225 e->loc);
5226 }
5227 }
5228 }
5229
5230 return (ret);
5231}
5232
5233static bool
5234evaluationOrderUndefined (lltok op)
5235{
5236 int opid = lltok_getTok (op);
5237
5238 return (opid != AND_OP && opid != OR_OP);
5239}
5240
5241static bool checkIntegral (/*@notnull@*/ exprNode e1,
5242 /*@notnull@*/ exprNode e2,
5243 /*@notnull@*/ exprNode ret,
5244 lltok op)
5245{
5246 bool error = FALSE;
5247
5248 ctype te1 = exprNode_getType (e1);
5249 ctype te2 = exprNode_getType (e2);
5250
5251 ctype tr1 = ctype_realishType (te1);
5252 ctype tr2 = ctype_realishType (te2);
5253
5254 if (ctype_isForceRealInt (&tr1) && ctype_isForceRealInt (&tr2))
5255 {
5256 ;
5257 }
5258 else
5259 {
5260 if (context_msgStrictOps ())
5261 {
5262 if (!ctype_isInt (tr1) && !ctype_isInt (tr2))
5263 {
5264 if (ctype_sameName (te1, te2))
5265 {
5266 error = optgenerror
5267 (FLG_STRICTOPS,
5268 message ("Operands of %s are non-integer (%t): %s",
5269 lltok_unparse (op), te1,
5270 exprNode_unparse (ret)),
5271 e1->loc);
5272 }
5273 else
5274 {
5275 error = optgenerror
5276 (FLG_STRICTOPS,
5277 message ("Operands of %s are non-integers (%t, %t): %s",
5278 lltok_unparse (op), te1, te2,
5279 exprNode_unparse (ret)),
5280 e1->loc);
5281 }
5282 }
5283 else if (!ctype_isInt (tr1))
5284 {
5285 error = optgenerror
5286 (FLG_STRICTOPS,
5287 message ("Left operand of %s is non-integer (%t): %s",
5288 lltok_unparse (op), te1, exprNode_unparse (ret)),
5289 e1->loc);
5290 }
5291 else
5292 /* !ctype_isInt (te2) */
5293 {
5294 error = optgenerror
5295 (FLG_STRICTOPS,
5296 message ("Right operand of %s is non-integer (%t): %s",
5297 lltok_unparse (op), te2, exprNode_unparse (ret)),
5298 e2->loc);
5299 }
5300 }
5301 }
5302
5303 return !error;
5304}
5305
5306/*
5307** returns exprNode representing e1 op e2
5308**
5309** uses msg if there are errors
5310** can be used for both assignment ops and regular ops
5311**
5312** modifies e1
5313*/
5314
5315static /*@only@*/ /*@notnull@*/ exprNode
5316exprNode_makeOp (/*@keep@*/ exprNode e1, /*@keep@*/ exprNode e2,
5317 /*@keep@*/ lltok op)
5318{
5319 ctype te1, te2, tr1, tr2, tret;
5320 int opid = lltok_getTok (op);
5321 bool hasError = FALSE;
5322 exprNode ret;
5323
5324 if (exprNode_isError (e1))
5325 {
5326 ret = exprNode_createPartialNVCopy (e2);
5327 }
5328 else
5329 {
5330 ret = exprNode_createPartialNVCopy (e1);
5331 }
5332
5333 ret->val = multiVal_undefined;
a956d444 5334
616915dd 5335 ret->kind = XPR_OP;
5336 ret->edata = exprData_makeOp (e1, e2, op);
5337
5338 if (exprNode_isError (e1) || exprNode_isError (e2))
5339 {
5340 if (opid == TLT || opid == TGT || opid == LE_OP || opid == GE_OP
5341 || opid == EQ_OP || opid == NE_OP
5342 || opid == AND_OP || opid == OR_OP)
5343 {
5344 ret->typ = ctype_bool;
5345 }
5346
5347 if (exprNode_isDefined (e1))
5348 {
5349 exprNode_checkUse (ret, e1->sref, e1->loc);
5350 }
5351
5352 if (exprNode_isDefined (e2))
5353 {
5354 exprNode_mergeUSs (ret, e2);
5355 exprNode_checkUse (ret, e2->sref, e2->loc);
5356 }
5357
5358 return ret;
5359 }
5360
5361 tret = ctype_unknown;
5362 te1 = exprNode_getType (e1);
8fe44445 5363
616915dd 5364 DPRINTF (("te1 = %s / %s", exprNode_unparse (e1), ctype_unparse (te1)));
5365
5366 te2 = exprNode_getType (e2);
5367
5368 tr1 = ctype_realishType (te1);
5369 tr2 = ctype_realishType (te2);
5370
5371 if (opid == OR_OP)
5372 {
10fac4bc 5373 exprNode_produceGuards (e2);
616915dd 5374 ret->guards = guardSet_or (ret->guards, e2->guards);
5375 }
5376 else if (opid == AND_OP)
5377 {
10fac4bc 5378 exprNode_produceGuards (e2); /* evans 2003-08-13: need to produce guards for expression */
5379 /* Shouldn't this have already happened? */
5380 DPRINTF (("Anding guards: %s / %s", guardSet_unparse (ret->guards), guardSet_unparse (e2->guards)));
616915dd 5381 ret->guards = guardSet_and (ret->guards, e2->guards);
5382 }
5383 else
5384 {
5385 /* no guards */
5386 }
5387
5388 if (opid == EQ_OP || opid == NE_OP)
5389 {
5390 exprNode temp1 = e1, temp2 = e2;
5391
5392 /* could do NULL == x */
5393
5394 if (exprNode_isNullValue (e1) || exprNode_isUnknownConstant (e1))
5395 {
5396 temp1 = e2; temp2 = e1;
5397 }
5398
5399 if (exprNode_isNullValue (temp2) || exprNode_isUnknownConstant (temp2))
5400 {
5401 reflectNullTest (temp1, (opid == NE_OP));
5402 guardSet_free (ret->guards);
5403 ret->guards = guardSet_copy (temp1->guards);
5404 }
5405 }
5406
5407 if (opid == TLT || opid == TGT || opid == LE_OP || opid == GE_OP
5408 || opid == EQ_OP || opid == NE_OP || opid == AND_OP || opid == OR_OP)
5409 {
5410 tret = ctype_bool;
5411 }
5412
5413 if (anyAbstract (tr1, tr2) &&
5414 (!((ctype_isRealBool (te1) || ctype_isRealBool (te2)) &&
5415 (opid == AND_OP || opid == OR_OP
5416 || opid == EQ_OP || opid == NE_OP))))
5417 {
e5081f8c 5418 if (abstractOpError (tr1, tr2, op, e1, e2, e1->loc, e2->loc))
5419 {
5420 tret = ctype_unknown;
5421 goto skiprest;
5422 }
616915dd 5423 }
e5081f8c 5424
5425 if (ctype_isUnknown (te1) || ctype_isUnknown (te2))
616915dd 5426 {
5427 /* unknown types, no comparisons possible */
e5081f8c 5428 goto skiprest;
616915dd 5429 }
e5081f8c 5430
5431 switch (opid)
616915dd 5432 {
e5081f8c 5433 case TMULT: /* multiplication and division: */
5434 case TDIV: /* */
5435 case MUL_ASSIGN: /* numeric, numeric -> numeric */
5436 case DIV_ASSIGN: /* */
5437 if (opid == TMULT || opid == MUL_ASSIGN)
616915dd 5438 {
e5081f8c 5439 ret->val = multiVal_multiply (exprNode_getValue (e1),
5440 exprNode_getValue (e2));
5441 }
5442 else
5443 {
5444 ret->val = multiVal_divide (exprNode_getValue (e1),
5445 exprNode_getValue (e2));
5446 }
5447
5448 tret = checkNumerics (tr1, tr2, te1, te2, e1, e2, op);
5449 break;
5450
5451 case TPLUS: /* addition and subtraction: */
5452 case TMINUS: /* pointer, int -> pointer */
5453 case SUB_ASSIGN: /* int, pointer -> pointer */
5454 case ADD_ASSIGN: /* numeric, numeric -> numeric */
5455 if (opid == TPLUS || opid == ADD_ASSIGN)
5456 {
5457 ret->val = multiVal_add (exprNode_getValue (e1),
5458 exprNode_getValue (e2));
5459 }
5460 else
5461 {
5462 ret->val = multiVal_subtract (exprNode_getValue (e1),
5463 exprNode_getValue (e2));
5464 }
5465
5466 tr1 = ctype_fixArrayPtr (tr1);
5467
5468 if ((ctype_isRealPointer (tr1) && !exprNode_isNullValue (e1))
5469 && (!ctype_isRealPointer (tr2) && ctype_isRealInt (tr2)))
5470 {
5471 /* pointer + int */
5472
5473 if (context_msgPointerArith ())
a956d444 5474 {
e5081f8c 5475 voptgenerror
5476 (FLG_POINTERARITH,
5477 message ("Pointer arithmetic (%t, %t): %s",
5478 te1, te2, exprNode_unparse (ret)),
5479 e1->loc);
a956d444 5480 }
616915dd 5481
e5081f8c 5482 /*
5483 ** Swap terms so e1 is always the pointer
5484 */
5485
5486 if (ctype_isRealPointer (tr1))
a956d444 5487 {
e5081f8c 5488 ;
a956d444 5489 }
5490 else
5491 {
e5081f8c 5492 exprNode_swap (e1, e2);
a956d444 5493 }
e5081f8c 5494
5495 if (sRef_possiblyNull (e1->sref)
5496 && !usymtab_isGuarded (e1->sref))
616915dd 5497 {
e5081f8c 5498 voptgenerror
5499 (FLG_NULLPOINTERARITH,
5500 message ("Pointer arithmetic involving possibly "
5501 "null pointer %s: %s",
5502 exprNode_unparse (e1),
5503 exprNode_unparse (ret)),
5504 e1->loc);
5505 }
5506
5507 ret->sref = sRef_copy (e1->sref);
5508
5509 /* start modifications */
5510 /* added by Seejo on 4/16/2000 */
5511
5512 /* Arithmetic operations on pointers wil modify the size/len/null terminated
5513 status */
5514 if ((sRef_isPossiblyNullTerminated (e1->sref)) || (sRef_isNullTerminated(e1->sref))) {
5515 int val;
5516 /*drl 1-4-2002
5517 added ugly fixed to stop
5518 program from crashing on point + int +int
5519 one day I'll fix this or ask Seejo wtf the codes supposed to do. */
5520
5521 if (!multiVal_isInt (e2->val) )
5522 break;
5523 /*end drl*/
5524
5525 val = (int) multiVal_forceInt (e2->val);
5526
5527 /* Operator : + or += */
5528 if ((lltok_getTok (op) == TPLUS) || (lltok_getTok(op) == ADD_ASSIGN)) {
5529 if (sRef_getSize(e1->sref) >= val) {/* Incrementing the pointer by
5530 val should not result in a
5531 size < 0 (size = 0 is ok !) */
ccf0a4a8 5532
e5081f8c 5533 sRef_setSize (ret->sref, sRef_getSize(e1->sref) - val);
ccf0a4a8 5534
e5081f8c 5535 if (sRef_getLen(e1->sref) == val) { /* i.e. the character at posn val is \0 */
5536 sRef_setNotNullTerminatedState(ret->sref);
5537 sRef_resetLen (ret->sref);
5538 } else {
5539 sRef_setNullTerminatedState(ret->sref);
5540 sRef_setLen (ret->sref, sRef_getLen(e1->sref) - val);
ccf0a4a8 5541 }
5542 }
616915dd 5543 }
e5081f8c 5544
5545 /* Operator : - or -= */
5546 if ((lltok_getTok (op) == TMINUS) || (lltok_getTok (op) == SUB_ASSIGN)) {
5547 if (sRef_getSize(e1->sref) >= 0) {
5548 sRef_setSize (ret->sref, sRef_getSize(e1->sref) + val);
5549 sRef_setLen (ret->sref, sRef_getLen(e1->sref) + val);
5550 }
5551 }
5552 }
5553
5554 /* end modifications */
5555
5556 sRef_setNullError (ret->sref);
5557
5558 /*
5559 ** Fixed for 2.2c: the alias state of ptr + int is dependent,
5560 ** since is points to storage that should not be deallocated
5561 ** through this pointer.
5562 */
5563
5564 if (sRef_isOnly (ret->sref)
5565 || sRef_isFresh (ret->sref))
616915dd 5566 {
e5081f8c 5567 sRef_setAliasKind (ret->sref, AK_DEPENDENT, exprNode_loc (ret));
5568 }
5569
5570 tret = e1->typ;
5571 }
5572 else if ((!ctype_isRealPointer(tr1) && ctype_isRealInt (tr1))
5573 && (ctype_isRealPointer (tr2) && !exprNode_isNullValue (e2)))
5574 {
5575 if (context_msgPointerArith ())
5576 {
5577 voptgenerror
5578 (FLG_POINTERARITH,
5579 message ("Pointer arithmetic (%t, %t): %s",
5580 te1, te2, exprNode_unparse (ret)),
5581 e1->loc);
5582 }
5583
5584 if (sRef_possiblyNull (e1->sref)
5585 && !usymtab_isGuarded (e1->sref))
5586 {
5587 voptgenerror
5588 (FLG_NULLPOINTERARITH,
5589 message ("Pointer arithmetic involving possibly "
5590 "null pointer %s: %s",
5591 exprNode_unparse (e2),
5592 exprNode_unparse (ret)),
5593 e2->loc);
5594 }
5595
5596 ret->sref = sRef_copy (e2->sref);
5597
5598 /* start modifications */
5599 /* added by Seejo on 4/16/2000 */
5600
5601 /* Arithmetic operations on pointers wil modify the size/len/null terminated
5602 status */
5603
5604 if ((sRef_isPossiblyNullTerminated (e2->sref)) || (sRef_isNullTerminated(e2->sref))) {
909cf5eb 5605 if (multiVal_isDefined (e1->val))
5606 {
5607 int val = (int) multiVal_forceInt (e1->val);
2209bcb7 5608
909cf5eb 5609 /* Operator : + or += */
5610 if ((lltok_getTok (op) == TPLUS) || (lltok_getTok(op) == ADD_ASSIGN)) {
5611 if (sRef_getSize(e2->sref) >= val) {/* Incrementing the pointer by
5612 val should not result in a
5613 size < 0 (size = 0 is ok !) */
5614
5615 sRef_setSize (ret->sref, sRef_getSize(e2->sref) - val);
5616
5617 if (sRef_getLen(e2->sref) == val) { /* i.e. the character at posn val is \0 */
5618 sRef_setNotNullTerminatedState(ret->sref);
5619 sRef_resetLen (ret->sref);
5620 } else {
5621 sRef_setNullTerminatedState(ret->sref);
5622 sRef_setLen (ret->sref, sRef_getLen(e2->sref) - val);
5623 }
5624 }
5625 }
2209bcb7 5626
909cf5eb 5627 /* Operator : - or -= */
5628 if ((lltok_getTok (op) == TMINUS) || (lltok_getTok (op) == SUB_ASSIGN)) {
5629 if (sRef_getSize(e2->sref) >= 0) {
5630 sRef_setSize (ret->sref, sRef_getSize(e2->sref) + val);
5631 sRef_setLen (ret->sref, sRef_getLen(e2->sref) + val);
5632 }
b7b694d6 5633 }
616915dd 5634 }
e5081f8c 5635 }
909cf5eb 5636
e5081f8c 5637 /* end modifications */
616915dd 5638
e5081f8c 5639 sRef_setNullError (ret->sref);
5640
5641 /*
5642 ** Fixed for 2.2c: the alias state of ptr + int is dependent,
5643 ** since is points to storage that should not be deallocated
5644 ** through this pointer.
5645 */
5646
5647 if (sRef_isOnly (ret->sref)
5648 || sRef_isFresh (ret->sref)) {
5649 sRef_setAliasKind (ret->sref, AK_DEPENDENT, exprNode_loc (ret));
5650 }
5651
5652 tret = e2->typ;
5653 ret->sref = e2->sref;
5654 }
5655 else
5656 {
5657 tret = checkNumerics (tr1, tr2, te1, te2, e1, e2, op);
5658 }
5659
5660 break;
5661
5662 case LEFT_ASSIGN:
5663 case RIGHT_ASSIGN:
5664 case LEFT_OP:
5665 case RIGHT_OP:
5666 case TAMPERSAND: /* bitwise & */
5667 case AND_ASSIGN:
5668 case TCIRC: /* ^ (XOR) */
5669 case TBAR:
5670 case XOR_ASSIGN:
5671 case OR_ASSIGN:
5672 {
5673 bool reported = FALSE;
5674
5675 /*
5676 ** Shift Operator
5677 */
5678
5679 if (opid == LEFT_OP || opid == LEFT_ASSIGN
5680 || opid == RIGHT_OP || opid == RIGHT_ASSIGN)
616915dd 5681 {
e5081f8c 5682 /*
5683 ** evans 2002-01-01: fixed this to follow ISO 6.5.7.
5684 */
5685
5686 if (!ctype_isUnsigned (tr2)
5687 && !exprNode_isNonNegative (e2))
5688 {
5689 reported = optgenerror
5690 (FLG_SHIFTNEGATIVE,
5691 message ("Right operand of %s may be negative (%t): %s",
5692 lltok_unparse (op), te2,
5693 exprNode_unparse (ret)),
5694 e2->loc);
5695 }
5696
5697 if (!ctype_isUnsigned (tr1)
5698 && !exprNode_isNonNegative (e1))
5699 {
5700 reported = optgenerror
5701 (FLG_SHIFTIMPLEMENTATION,
5702 message ("Left operand of %s may be negative (%t): %s",
5703 lltok_unparse (op), te1,
5704 exprNode_unparse (ret)),
5705 e1->loc);
5706 }
616915dd 5707
a956d444 5708 /*
e5081f8c 5709 ** Should check size of right operand also...
a956d444 5710 */
e5081f8c 5711
5712 }
5713 else
5714 {
5715 if (!ctype_isUnsigned (tr1))
616915dd 5716 {
e5081f8c 5717 if (exprNode_isNonNegative (e1)) {
5718 ;
5719 } else {
5720 reported = optgenerror
5721 (FLG_BITWISEOPS,
5722 message ("Left operand of %s is not unsigned value (%t): %s",
5723 lltok_unparse (op), te1,
5724 exprNode_unparse (ret)),
5725 e1->loc);
5726
5727 if (reported) {
5728 te1 = ctype_uint;
a956d444 5729 }
e5081f8c 5730 }
616915dd 5731 }
e5081f8c 5732 else
616915dd 5733 {
e5081f8c 5734 if (!ctype_isUnsigned (tr2))
616915dd 5735 {
e5081f8c 5736 if (!exprNode_isNonNegative (e2)) {
616915dd 5737 reported = optgenerror
a956d444 5738 (FLG_BITWISEOPS,
e5081f8c 5739 message ("Right operand of %s is not unsigned value (%t): %s",
5740 lltok_unparse (op), te2,
616915dd 5741 exprNode_unparse (ret)),
e5081f8c 5742 e2->loc);
5743 }
a956d444 5744 }
616915dd 5745 }
616915dd 5746 }
e5081f8c 5747
5748 if (!reported)
5749 {
5750 if (!checkIntegral (e1, e2, ret, op)) {
5751 te1 = ctype_unknown;
5752 }
616915dd 5753 }
e5081f8c 5754
5755 DPRINTF (("Set: %s", ctype_unparse (te1)));
5756
5757 /*
5758 ** tret is the widest type of te1 and te2
5759 */
5760
5761 tret = ctype_widest (te1, te2);
5762 break;
5763 }
5764 case MOD_ASSIGN:
5765 case TPERCENT:
5766 if (checkIntegral (e1, e2, ret, op)) {
5767 tret = te1;
5768 } else {
5769 tret = ctype_unknown;
5770 }
5771 break;
5772 case EQ_OP:
5773 case NE_OP:
5774 case TLT: /* comparisons */
5775 case TGT: /* numeric, numeric -> bool */
5776
5777 DPRINTF (("Here we go: %s / %s",
5778 ctype_unparse (tr1), ctype_unparse (tr2)));
5779
5780 if ((ctype_isReal (tr1) && !ctype_isInt (tr1))
5781 || (ctype_isReal (tr2) && !ctype_isInt (tr2)))
5782 {
5783 ctype rtype = tr1;
5784 bool fepsilon = FALSE;
5785
5786 if (!ctype_isReal (rtype) || ctype_isInt (rtype))
616915dd 5787 {
e5081f8c 5788 rtype = tr2;
5789 }
5790
5791 if (opid == TLT || opid == TGT)
5792 {
5793 uentry ue1 = exprNode_getUentry (e1);
5794 uentry ue2 = exprNode_getUentry (e2);
616915dd 5795
e5081f8c 5796 /*
5797 ** FLT_EPSILON, etc. really is a variable, not
5798 ** a constant.
5799 */
5800
5801 if (uentry_isVariable (ue1))
616915dd 5802 {
e5081f8c 5803 cstring uname = uentry_rawName (ue1);
5804
5805 if (cstring_equalLit (uname, "FLT_EPSILON")
5806 || cstring_equalLit (uname, "DBL_EPSILON")
5807 || cstring_equalLit (uname, "LDBL_EPSILON"))
616915dd 5808 {
e5081f8c 5809 fepsilon = TRUE;
616915dd 5810 }
5811 }
e5081f8c 5812
5813 if (uentry_isVariable (ue2))
616915dd 5814 {
e5081f8c 5815 cstring uname = uentry_rawName (ue2);
5816
5817 if (cstring_equalLit (uname, "FLT_EPSILON")
5818 || cstring_equalLit (uname, "DBL_EPSILON")
5819 || cstring_equalLit (uname, "LDBL_EPSILON"))
5820 {
5821 fepsilon = TRUE;
5822 }
616915dd 5823 }
5824 }
e5081f8c 5825
5826 if (fepsilon)
616915dd 5827 {
e5081f8c 5828 ; /* Don't complain. */
616915dd 5829 }
e5081f8c 5830 else
5831 {
419f7a7a 5832 if (opid == EQ_OP || opid == NE_OP)
5833 {
5834 voptgenerror
5835 (FLG_REALCOMPARE,
5836 message ("Dangerous equality comparison involving %s types: %s",
5837 ctype_unparse (rtype),
5838 exprNode_unparse (ret)),
5839 ret->loc);
5840 }
5841 else
5842 {
5843 voptgenerror
5844 (FLG_REALRELATECOMPARE,
5845 message ("Possibly dangerous relational comparison involving %s types: %s",
5846 ctype_unparse (rtype),
5847 exprNode_unparse (ret)),
5848 ret->loc);
5849 }
e5081f8c 5850 }
5851 }
5852 /*@fallthrough@*/
5853 case LE_OP:
5854 case GE_OP:
5855
5856 /*
5857 ** Types should match.
5858 */
5859
5860 DPRINTF (("Match types: %s / %s", exprNode_unparse (e1),
5861 exprNode_unparse (e2)));
5862
5863 if (!exprNode_matchTypes (e1, e2))
5864 {
5865 hasError = gentypeerror
5866 (te1, e1, te2, e2,
5867 message ("Operands of %s have incompatible types (%t, %t): %s",
5868 lltok_unparse (op), te1, te2, exprNode_unparse (ret)),
5869 e1->loc);
5870
5871 }
5872
5873 if (hasError
5874 || (ctype_isForceRealNumeric (&tr1)
5875 && ctype_isForceRealNumeric (&tr2)) ||
5876 (ctype_isRealPointer (tr1) && ctype_isRealPointer (tr2)))
5877 {
5878 ; /* okay */
5879 }
5880 else
5881 {
5882 if ((ctype_isRealNumeric (tr1) && ctype_isRealPointer (tr2)) ||
5883 (ctype_isRealPointer (tr1) && ctype_isRealNumeric (tr2)))
616915dd 5884 {
e5081f8c 5885 voptgenerror
5886 (FLG_PTRNUMCOMPARE,
5887 message ("Comparison of pointer and numeric (%t, %t): %s",
5888 te1, te2, exprNode_unparse (ret)),
5889 e1->loc);
616915dd 5890 }
5891 else
5892 {
e5081f8c 5893 (void) checkNumerics (tr1, tr2, te1, te2, e1, e2, op);
616915dd 5894 }
e5081f8c 5895 tret = ctype_bool;
5896 }
5897
5898 /* certain comparisons on unsigned's and zero look suspicious */
5899
5900 if (opid == TLT || opid == LE_OP || opid == GE_OP)
5901 {
5902 if ((ctype_isUnsigned (tr1) && exprNode_isZero (e2))
5903 || (ctype_isUnsigned (tr2) && exprNode_isZero (e1)))
1d239d69 5904 {
e5081f8c 5905 voptgenerror
5906 (FLG_UNSIGNEDCOMPARE,
5907 message ("Comparison of unsigned value involving zero: %s",
5908 exprNode_unparse (ret)),
5909 e1->loc);
1d239d69 5910 }
e5081f8c 5911 }
5912
5913 /* EQ_OP should NOT be used with booleans (unless one is FALSE) */
5914
5915 if ((opid == EQ_OP || opid == NE_OP) &&
5916 ctype_isDirectBool (tr1) && ctype_isDirectBool (tr2))
5917 {
5918 /*
5919 ** is one a variable?
5920 */
616915dd 5921
e5081f8c 5922 if (uentry_isVariable (exprNode_getUentry (e1))
5923 || uentry_isVariable (exprNode_getUentry (e2)))
616915dd 5924 {
5925 /*
e5081f8c 5926 ** comparisons with FALSE are okay
616915dd 5927 */
e5081f8c 5928
5929 if (exprNode_isFalseConstant (e1)
5930 || exprNode_isFalseConstant (e2))
616915dd 5931 {
e5081f8c 5932 ;
5933 }
5934 else
5935 {
5936 voptgenerror
5937 (FLG_BOOLCOMPARE,
5938 message
5939 ("Use of %q with %s variables (risks inconsistency because "
5940 "of multiple true values): %s",
5941 cstring_makeLiteral ((opid == EQ_OP) ? "==" : "!="),
5942 context_printBoolName (), exprNode_unparse (ret)),
5943 e1->loc);
616915dd 5944 }
5945 }
e5081f8c 5946 }
5947 break;
5948
5949 case AND_OP: /* bool, bool -> bool */
5950 case OR_OP:
5951 if (ctype_isForceRealBool (&tr1) && ctype_isForceRealBool (&tr2))
5952 {
5953 ;
5954 }
5955 else
5956 {
5957 if (context_maybeSet (FLG_BOOLOPS))
616915dd 5958 {
e5081f8c 5959 if (!ctype_isRealBool (te1) && !ctype_isRealBool (te2))
616915dd 5960 {
e5081f8c 5961 if (ctype_sameName (te1, te2))
616915dd 5962 {
5963 voptgenerror
5964 (FLG_BOOLOPS,
e5081f8c 5965 message ("Operands of %s are non-boolean (%t): %s",
5966 lltok_unparse (op), te1,
5967 exprNode_unparse (ret)),
616915dd 5968 e1->loc);
5969 }
616915dd 5970 else
5971 {
e5081f8c 5972 voptgenerror
5973 (FLG_BOOLOPS,
5974 message
5975 ("Operands of %s are non-booleans (%t, %t): %s",
5976 lltok_unparse (op), te1, te2, exprNode_unparse (ret)),
5977 e1->loc);
616915dd 5978 }
5979 }
e5081f8c 5980 else if (!ctype_isRealBool (te1))
5981 {
5982 voptgenerror
5983 (FLG_BOOLOPS,
5984 message ("Left operand of %s is non-boolean (%t): %s",
5985 lltok_unparse (op), te1, exprNode_unparse (ret)),
5986 e1->loc);
5987 }
5988 else if (!ctype_isRealBool (te2))
5989 {
5990 voptgenerror
5991 (FLG_BOOLOPS,
5992 message ("Right operand of %s is non-boolean (%t): %s",
5993 lltok_unparse (op), te2, exprNode_unparse (ret)),
5994 e2->loc);
5995 }
5996 else
5997 {
5998 ;
5999 }
616915dd 6000 }
e5081f8c 6001 tret = ctype_bool;
616915dd 6002 }
e5081f8c 6003 break;
6004 default:
6005 llfatalbug
6006 (cstring_makeLiteral
6007 ("There has been a problem in the parser. This is believed to result "
6008 "from a problem with bison v. 1.25. Please try rebuidling Splint "
6009 "using the pre-compiled grammar files by commenting out the "
6010 "BISON= line in the top-level Makefile."));
616915dd 6011 }
6012
e5081f8c 6013skiprest:
616915dd 6014 ret->typ = tret;
e5081f8c 6015 DPRINTF (("Return type %s: %s", exprNode_unparse (ret), ctype_unparse (tret)));
616915dd 6016
6017 exprNode_checkUse (ret, e1->sref, e1->loc);
6018 exprNode_mergeUSs (ret, e2);
6019 exprNode_checkUse (ret, e2->sref, e2->loc);
6020
6021 return ret;
6022}
6023
6024/*@only@*/ exprNode
6025exprNode_op (/*@only@*/ exprNode e1, /*@keep@*/ exprNode e2,
6026 /*@only@*/ lltok op)
6027{
6028 exprNode ret;
6029
6030 checkMacroParen (e1);
6031 checkMacroParen (e2);
6032
6033 if (evaluationOrderUndefined (op) && context_maybeSet (FLG_EVALORDER))
6034 {
6035 checkExpressionDefined (e1, e2, op);
6036 }
6037
6038 ret = exprNode_makeOp (e1, e2, op);
6039 return (ret);
6040}
6041
6042static
6043void exprNode_checkAssignMod (exprNode e1, exprNode ret)
6044{
6045 /*
6046 ** This is somewhat bogus!
6047 **
6048 ** Assigning to a nested observer in a non-observer datatype
6049 ** should not produce an error.
6050 */
6051
6052 sRef ref = exprNode_getSref (e1);
6053
6054 DPRINTF (("Check assign mod: %s",
6055 sRef_unparseFull (ref)));
6056
6057 if (sRef_isObserver (ref)
28bf4b0b 6058 || ((sRef_isFileStatic (ref) || sRef_isFileOrGlobalScope (ref))
616915dd 6059 && ctype_isArray (ctype_realType (sRef_getType (ref)))))
6060 {
6061 sRef base = sRef_getBase (ref);
6062
6063 if (sRef_isValid (base) && sRef_isObserver (base))
6064 {
6065 exprNode_checkModify (e1, ret);
6066 }
6067 else
6068 {
6069 exprNode_checkModifyVal (e1, ret);
6070 }
6071 }
6072 else
6073 {
6074 exprNode_checkModify (e1, ret);
6075 }
6076}
6077
6078exprNode
abd7f895 6079exprNode_assign (/*@only@*/ exprNode e1, /*@only@*/ exprNode e2, /*@only@*/ lltok op)
616915dd 6080{
6081 bool isalloc = FALSE;
6082 bool isjustalloc = FALSE;
2209bcb7 6083 bool noalias = FALSE;
616915dd 6084 exprNode ret;
6085
6086 DPRINTF (("%s [%s] <- %s [%s]",
6087 exprNode_unparse (e1),
6088 ctype_unparse (e1->typ),
6089 exprNode_unparse (e2),
6090 ctype_unparse (e2->typ)));
6091
6092 if (lltok_getTok (op) != TASSIGN)
6093 {
6094 ret = exprNode_makeOp (e1, e2, op);
2209bcb7 6095
6096 DPRINTF (("Here goes: %s %s",
6097 ctype_unparse (e1->typ),
6098 ctype_unparse (e2->typ)));
6099
abd7f895 6100 if (exprNode_isDefined (e1)
6101 && exprNode_isDefined (e2))
2209bcb7 6102 {
abd7f895 6103 if (ctype_isNumeric (e2->typ)
6104 || ctype_isNumeric (e1->typ))
6105 {
6106 /* Its a pointer arithmetic expression like ptr += i */
6107 noalias = TRUE;
6108 }
6109 }
6110 }
616915dd 6111 else
6112 {
6113 ret = exprNode_createPartialCopy (e1);
6114 ret->kind = XPR_ASSIGN;
6115 ret->edata = exprData_makeOp (e1, e2, op);
6116
6117 if (!exprNode_isError (e2))
6118 {
6119 ret->sets = sRefSet_union (ret->sets, e2->sets);
6120 ret->msets = sRefSet_union (ret->msets, e2->msets);
6121 ret->uses = sRefSet_union (ret->uses, e2->uses);
6122 }
6123 }
6124
6125 checkExpressionDefined (e1, e2, op);
6126
6127 if (exprNode_isError (e1))
6128 {
6129 if (!exprNode_isError (e2))
6130 {
6131 ret->loc = fileloc_update (ret->loc, e2->loc);
6132 }
6133 else
6134 {
6135 ret->loc = fileloc_update (ret->loc, g_currentloc);
6136 }
6137 }
6138
6139 if (!exprNode_isError (e2))
6140 {
6141 checkMacroParen (e2);
6142 }
6143
6144 if (exprNode_isDefined (e1))
6145 {
6146 if (sRef_isMacroParamRef (e1->sref))
6147 {
6148 if (context_inIterDef ())
6149 {
6150 uentry ue = sRef_getUentry (e1->sref);
6151
6152 if (uentry_isYield (ue))
6153 {
6154 ;
6155 }
6156 else
6157 {
6158 if (fileloc_isDefined (e1->loc))
6159 {
6160 voptgenerror
6161 (FLG_MACROPARAMS,
6162 message ("Assignment to non-yield iter parameter: %q",
6163 sRef_unparse (e1->sref)),
6164 e1->loc);
6165 }
6166 else
6167 {
6168 voptgenerror
6169 (FLG_MACROPARAMS,
6170 message ("Assignment to non-yield iter parameter: %q",
6171 sRef_unparse (e1->sref)),
6172 g_currentloc);
6173 }
6174 }
6175 }
6176 else
6177 {
6178 if (fileloc_isDefined (e1->loc))
6179 {
6180 voptgenerror
6181 (FLG_MACROASSIGN,
6182 message ("Assignment to macro parameter: %q",
6183 sRef_unparse (e1->sref)),
6184 e1->loc);
6185 }
6186 else
6187 {
6188 voptgenerror
6189 (FLG_MACROASSIGN,
6190 message ("Assignment to macro parameter: %q",
6191 sRef_unparse (e1->sref)),
6192 g_currentloc);
6193 }
ccf0a4a8 6194
6195 exprNode_checkAssignMod (e1, ret); /* evans 2001-07-22 */
616915dd 6196 }
6197 }
6198 else
6199 {
6200 exprNode_checkAssignMod (e1, ret);
6201 }
6202
6203 if (exprNode_isDefined (e2))
6204 {
6205 if (lltok_getTok (op) == TASSIGN)
6206 {
6207 ctype te1 = exprNode_getType (e1);
6208 ctype te2 = exprNode_getType (e2);
6209
abd7f895 6210 if (ctype_isVoid (te2))
6211 {
6212 (void) gentypeerror
6213 (te2, e2, te1, e1,
6214 message ("Assignment of void value to %t: %s %s %s",
6215 te1, exprNode_unparse (e1),
6216 lltok_unparse (op),
6217 exprNode_unparse (e2)),
6218 e1->loc);
6219 }
6220 else if (!ctype_forceMatch (te1, te2))
616915dd 6221 {
6222 if (exprNode_matchLiteral (te1, e2))
6223 {
e5081f8c 6224 DPRINTF (("Literals match: %s / %s",
6225 ctype_unparse (te1), exprNode_unparse (e2)));
6226 if (ctype_isNumAbstract (te1)) {
6227 if (!context_flagOn (FLG_NUMABSTRACTLIT, e1->loc)) {
6228 (void) llgenhinterror
6229 (FLG_NUMABSTRACT,
6230 message
6231 ("Assignment of %t literal to numabstract type %t: %s %s %s",
6232 te2, te1,
6233 exprNode_unparse (e1),
6234 lltok_unparse (op),
6235 exprNode_unparse (e2)),
6236 cstring_makeLiteral
6237 ("Use +numabstractlit to allow numeric literals to be used as numabstract values"),
6238 e1->loc);
6239 }
6240 }
616915dd 6241 }
6242 else
6243 {
6244 (void) gentypeerror
6245 (te2, e2, te1, e1,
6246 message ("Assignment of %t to %t: %s %s %s",
6247 te2, te1, exprNode_unparse (e1),
6248 lltok_unparse (op),
6249 exprNode_unparse (e2)),
6250 e1->loc);
6251 }
6252 }
abd7f895 6253 else
6254 {
6255 /* Type checks okay */
6256 }
616915dd 6257 }
6258
6259 exprNode_mergeUSs (ret, e2);
6260 exprNode_checkUse (ret, e2->sref, e2->loc);
6261
2209bcb7 6262 DPRINTF (("Do assign! %s %s", exprNode_unparse (e1), exprNode_unparse (e2)));
6263 if (noalias)
6264 {
6265 ;
6266 }
6267 else
6268 {
6269 doAssign (e1, e2, FALSE);
6270 }
6271
616915dd 6272 ret->sref = e1->sref;
6273 }
6274 else
6275 {
6276 if (exprNode_isDefined (e2))
6277 {
6278 exprNode_mergeUSs (ret, e2);
2209bcb7 6279 exprNode_checkUse (ret, e2->sref, e2->loc);
616915dd 6280 }
6281 }
6282
6283 if (sRef_isPointer (e1->sref) && !sRef_isMacroParamRef (e1->sref))
6284 {
6285 exprNode_checkUse (ret, sRef_getBase (e1->sref), e1->loc);
6286 }
6287
6288 isjustalloc = sRef_isJustAllocated (e1->sref);
6289 isalloc = sRef_isAllocated (e1->sref);
6290
6291 if (sRef_isField (e1->sref))
6292 {
6293 sRef root = sRef_getRootBase (sRef_getBase (e1->sref));
6294
6295 if (!sRef_isAllocated (root) && !sRef_isMacroParamRef (root))
6296 {
6297 exprNode_checkUse (ret, root, e1->loc);
6298 }
6299
6300 }
6301
6302 /*
6303 ** be careful! this defines e1->sref.
6304 */
ccf0a4a8 6305
6306 /* evans 2001-07-22: removed if (!sRef_isMacroParamRef (e1->sref)) */
6307
1d239d69 6308 DPRINTF (("Setting: %s -> %s", exprNode_unparse (ret), sRef_unparse (e1->sref)));
ccf0a4a8 6309 exprNode_checkSet (ret, e1->sref);
616915dd 6310
6311 if (isjustalloc)
6312 {
6313 sRef_setAllocatedComplete (e1->sref, exprNode_isDefined (e2)
6314 ? e2->loc : e1->loc);
6315 }
6316 else
6317 {
6318 if (isalloc)
6319 {
6320 sRef_setAllocatedShallowComplete (e1->sref, exprNode_loc (e2));
6321 }
6322 }
6323 }
6324
6325 return ret;
6326}
6327
6328exprNode
6329exprNode_cond (/*@keep@*/ exprNode pred, /*@keep@*/ exprNode ifclause,
6330 /*@keep@*/ exprNode elseclause)
6331{
6332 exprNode ret;
6333
6334 if (!exprNode_isError (pred))
6335 {
6336 ret = exprNode_createPartialCopy (pred);
6337 checkMacroParen (pred);
6338 exprNode_checkPred (cstring_makeLiteralTemp ("conditional"), pred);
6339
6340 if (!exprNode_isError (ifclause))
6341 {
6342 checkMacroParen (ifclause); /* update macro counts! */
6343
6344 if (!exprNode_isError (elseclause))
6345 {
6346 checkMacroParen (elseclause);
6347
6348 if (!exprNode_matchTypes (ifclause, elseclause))
6349 {
6350 if (gentypeerror
6351 (exprNode_getType (ifclause),
6352 ifclause,
6353 exprNode_getType (elseclause),
6354 elseclause,
6355 message ("Conditional clauses are not of same type: "
6356 "%s (%t), %s (%t)",
6357 exprNode_unparse (ifclause),
6358 exprNode_getType (ifclause),
6359 exprNode_unparse (elseclause),
6360 exprNode_getType (elseclause)),
6361 ifclause->loc))
6362 {
6363 ret->sref = sRef_undefined;
6364 ret->typ = ctype_unknown;
6365 }
6366 }
6367 else
6368 {
6369 /* for now...should merge the states */
6370 ret->sref = ifclause->sref;
6371 ret->typ = ifclause->typ;
6372
6373 if (exprNode_isNullValue (ifclause))
6374 {
6375 ret->typ = elseclause->typ;
6376 }
6377 }
6378
6379 exprNode_checkUse (ret, pred->sref, pred->loc);
6380 exprNode_checkUse (ifclause, ifclause->sref, ifclause->loc);
6381 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
6382
6383 exprNode_mergeCondUSs (ret, ifclause, elseclause);
6384
6385 }
6386 else
6387 {
6388 ret->typ = ifclause->typ;
6389
6390 exprNode_checkUse (pred, pred->sref, pred->loc);
6391 exprNode_checkUse (ifclause, ifclause->sref, ifclause->loc);
6392
6393 exprNode_mergeCondUSs (ret, ifclause, exprNode_undefined);
6394 }
6395 }
6396 else
6397 {
6398 if (!exprNode_isError (elseclause))
6399 {
6400 ret->typ = elseclause->typ;
6401
6402 exprNode_checkUse (pred, pred->sref, pred->loc);
6403 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
6404
6405 exprNode_mergeCondUSs (ret, exprNode_undefined, elseclause);
6406 }
6407 }
6408 }
6409 else /* pred is error */
6410 {
6411 if (!exprNode_isError (ifclause))
6412 {
6413 ret = exprNode_createSemiCopy (ifclause);
6414
6415 checkMacroParen (ifclause); /* update macro counts! */
6416
6417 if (!exprNode_isError (elseclause))
6418 {
6419 checkMacroParen (elseclause);
6420
6421 ret->typ = ifclause->typ;
6422
6423 if (!ctype_forceMatch (ifclause->typ, elseclause->typ))
6424 {
6425 if (gentypeerror
6426 (exprNode_getType (ifclause),
6427 ifclause,
6428 exprNode_getType (elseclause),
6429 elseclause,
6430 message ("Conditional clauses are not of same type: "
6431 "%s (%t), %s (%t)",
6432 exprNode_unparse (ifclause),
6433 exprNode_getType (ifclause),
6434 exprNode_unparse (elseclause),
6435 exprNode_getType (elseclause)),
6436 ifclause->loc))
6437 {
6438 ret->typ = ctype_unknown;
6439 }
6440 }
6441
6442 exprNode_checkUse (ifclause, ifclause->sref, ifclause->loc);
6443 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
6444
6445 exprNode_mergeCondUSs (ret, ifclause, elseclause);
6446 }
6447 }
6448 else if (!exprNode_isError (elseclause)) /* pred, if errors */
6449 {
6450 ret = exprNode_createSemiCopy (ifclause);
6451
6452 ret->typ = elseclause->typ;
6453 checkMacroParen (elseclause);
6454
6455 exprNode_checkUse (elseclause, elseclause->sref, elseclause->loc);
6456 exprNode_mergeCondUSs (ret, exprNode_undefined, elseclause);
6457 }
6458 else /* all errors! */
6459 {
7ebcc5bb 6460 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
616915dd 6461 }
6462 }
6463
6464 ret->kind = XPR_COND;
6465 ret->edata = exprData_makeCond (pred, ifclause, elseclause);
6466
6467 if (exprNode_isDefined (ifclause) && exprNode_isDefined (elseclause))
6468 {
6469 exprNode_combineControl (ret, ifclause, elseclause);
6470 }
6471
6472 return (ret);
6473}
6474
6475exprNode
6476exprNode_vaArg (/*@only@*/ lltok tok, /*@only@*/ exprNode arg, /*@only@*/ qtype qt)
6477{
6478 ctype totype = qtype_getType (qt);
6479 exprNode ret =
6480 exprNode_createPartialLocCopy (arg, fileloc_copy (lltok_getLoc (tok)));
6481 ctype targ;
6482
6483 /*
6484 ** check use of va_arg : <valist>, type -> type
6485 */
6486
6487 if (exprNode_isError (arg))
6488 {
6489 }
6490 else
6491 {
6492 targ = exprNode_getType (arg);
6493
6494 /*
6495 ** arg should have be a pointer
6496 */
6497
6498 if (!ctype_isUA (targ) ||
b73d1009 6499 (!typeId_equal (ctype_typeId (targ),
6500 usymtab_getTypeId (cstring_makeLiteralTemp ("va_list")))))
616915dd 6501 {
6502 voptgenerror
6503 (FLG_TYPE,
6504 message ("First argument to va_arg is not a va_list (type %t): %s",
6505 targ, exprNode_unparse (arg)),
6506 arg->loc);
6507 }
6508
6509 exprNode_checkSet (ret, arg->sref);
6510 }
6511
6512 /*
6513 ** return type is totype
6514 */
6515
6516 ret->typ = totype;
6517 ret->kind = XPR_VAARG;
6518 ret->edata = exprData_makeCast (tok, arg, qt);
6519
6520 return (ret);
6521}
6522
6523exprNode exprNode_labelMarker (/*@only@*/ cstring label)
6524{
6525 exprNode ret = exprNode_createPlain (ctype_undefined);
6526 ret->kind = XPR_LABEL;
6527 ret->edata = exprData_makeLiteral (label);
6528 ret->isJumpPoint = TRUE;
6529
6530 return (ret); /* for now, ignore label */
6531}
6532
6533exprNode exprNode_notReached (/*@returned@*/ exprNode stmt)
6534{
6535 if (exprNode_isDefined (stmt))
6536 {
6537 stmt->isJumpPoint = TRUE;
6538
6539 /* This prevent stray no return path errors, etc. */
6540 stmt->exitCode = XK_MUSTEXIT;
6541 }
6542
6543 return (stmt);
6544}
6545
6546bool exprNode_isDefaultMarker (exprNode e)
6547{
6548 if (exprNode_isDefined (e))
6549 {
6550 return (e->kind == XPR_DEFAULT || e->kind == XPR_FTDEFAULT);
6551 }
6552
6553 return FALSE;
6554}
6555
6556bool exprNode_isCaseMarker (exprNode e)
6557{
6558 if (exprNode_isDefined (e))
6559 {
6560 return (e->kind == XPR_FTCASE || e->kind == XPR_CASE);
6561 }
6562
6563 return FALSE;
6564}
6565
6566bool exprNode_isLabelMarker (exprNode e)
6567{
6568 if (exprNode_isDefined (e))
6569 {
6570 return (e->kind == XPR_LABEL);
6571 }
6572
6573 return FALSE;
6574}
6575
6576exprNode exprNode_caseMarker (/*@only@*/ exprNode test, bool fallThrough)
6577{
6578 exprNode ret = exprNode_createPartialCopy (test);
6579
6580 ret->kind = fallThrough ? XPR_FTCASE : XPR_CASE;
6581
6582 if (exprNode_isError (test)) {
6583 return ret;
6584 }
6585
6586 exprNode_checkUse (ret, test->sref, test->loc);
6587
6588 usymtab_setExitCode (ret->exitCode);
6589
6590 if (ret->mustBreak)
6591 {
6592 usymtab_setMustBreak ();
6593 }
6594
6595 ret->edata = exprData_makeSingle (test);
6596 ret->isJumpPoint = TRUE;
6597
6598 return ret;
6599}
6600
6601# if 0
6602exprNode exprNode_caseStatement (/*@only@*/ exprNode test, /*@only@*/ exprNode stmt, bool fallThrough)
6603{
6604 exprNode ret = exprNode_createPartialCopy (test);
6605
6606 ret->kind = fallThrough ? XPR_FTCASE : XPR_CASE;
6607 ret->edata = exprData_makePair (test, stmt);
6608 ret->isJumpPoint = TRUE;
6609
6610 if (exprNode_isError (test))
6611 {
6612 return ret;
6613 }
6614
6615 exprNode_checkUse (ret, test->sref, test->loc);
6616
6617 if (exprNode_isError (stmt))
6618 {
6619 return ret;
6620 }
6621
6622 exprNode_mergeUSs (ret, stmt);
6623
6624 ret->exitCode = stmt->exitCode;
6625 ret->mustBreak = stmt->mustBreak;
6626 ret->canBreak = stmt->canBreak;
6627
6628 usymtab_setExitCode (ret->exitCode);
6629
6630 if (ret->mustBreak)
6631 {
6632 usymtab_setMustBreak ();
6633 }
6634
6635 return ret;
6636}
6637# endif
6638
6639/*@notnull@*/ /*@only@*/ exprNode
6640exprNode_defaultMarker (/*@only@*/ lltok def, bool fallThrough)
6641{
6642 exprNode ret = exprNode_createTok (def);
6643
6644 ret->isJumpPoint = TRUE;
6645 ret->kind = fallThrough ? XPR_FTDEFAULT : XPR_DEFAULT;
6646 return (ret);
6647}
6648
6649bool
6650exprNode_mayEscape (exprNode e)
6651{
6652 if (exprNode_isDefined (e))
6653 {
6654 return exitkind_couldEscape (e->exitCode);
6655 }
6656 return FALSE;
6657}
6658
6659static bool
6660exprNode_mustBreak (exprNode e)
6661{
6662 if (exprNode_isDefined (e))
6663 {
6664 return e->mustBreak;
6665 }
8f8721fe 6666
616915dd 6667 return FALSE;
6668}
6669
6670bool
6671exprNode_mustEscape (exprNode e)
6672{
6673 if (exprNode_isDefined (e))
6674 {
6675 return exitkind_mustEscape (e->exitCode) || exprNode_mustBreak (e);
6676 }
6677
6678 return FALSE;
6679}
6680
6681bool
6682exprNode_errorEscape (exprNode e)
6683{
6684 if (exprNode_isDefined (e))
6685 {
6686 return exitkind_isError (e->exitCode);
6687 }
6688
6689 return FALSE;
6690}
6691
6692exprNode exprNode_concat (/*@only@*/ exprNode e1, /*@only@*/ exprNode e2)
6693{
6694 exprNode ret = exprNode_createPartialCopy (e1);
6695
28bf4b0b 6696 DPRINTF (("Concat: %s / %s", exprNode_unparse (e1), exprNode_unparse (e2)));
6697
616915dd 6698 ret->edata = exprData_makePair (e1, e2);
6699 ret->kind = XPR_STMTLIST;
6700
6701 if (exprNode_isDefined (e1))
6702 {
6703 ret->isJumpPoint = e1->isJumpPoint;
6704 ret->canBreak = e1->canBreak;
6705 }
6706 else
6707 {
6708 if (exprNode_isDefined (e2))
6709 {
6710 ret->loc = fileloc_update (ret->loc, e2->loc);
6711 }
6712 }
6713
6714 if (exprNode_isDefined (e2))
6715 {
6716 ret->exitCode = e2->exitCode;
6717 ret->mustBreak = e2->mustBreak;
6718 if (e2->canBreak) ret->canBreak = TRUE;
6719 }
6720
6721 /*
6722 ** if e1 must return, then e2 is unreachable!
6723 */
6724
6725 if (exprNode_isDefined (e1) && exprNode_isDefined (e2))
6726 {
6727 if ((exprNode_mustEscape (e1) || exprNode_mustBreak (e1))
6728 && !(e2->isJumpPoint))
6729 {
6730 if (context_getFlag (FLG_UNREACHABLE))
6731 {
6732 exprNode nr = e2;
6733
6734 if (e2->kind == XPR_STMT)
6735 {
6736 nr = exprData_getUopNode (e2->edata);
6737 }
6738
6739 if ((nr->kind == XPR_TOK
6740 && lltok_isSemi (exprData_getTok (nr->edata))))
6741 {
6742 /* okay to have unreachable ";" */
6743 ret->exitCode = XK_MUSTEXIT;
6744 ret->canBreak = TRUE;
6745 }
6746 else
6747 {
6748 if (optgenerror (FLG_UNREACHABLE,
6749 message ("Unreachable code: %s",
6750 exprNode_unparseFirst (nr)),
6751 exprNode_loc (nr)))
6752 {
6753 ret->isJumpPoint = TRUE;
6754 ret->mustBreak = FALSE;
6755 ret->exitCode = XK_ERROR;
6756 DPRINTF (("Jump point: %s", exprNode_unparse (ret)));
6757 }
6758 else
6759 {
6760 ret->exitCode = XK_MUSTEXIT;
6761 ret->canBreak = TRUE;
6762 }
6763
6764 }
6765 }
6766 }
6767 else
6768 {
6769 if ((e2->kind == XPR_CASE || e2->kind == XPR_DEFAULT))
6770 {
6771 /*
6772 ** We want a warning anytime we have:
6773 ** case xxx: ...
6774 ** yyy; <<<- no break or return
6775 ** case zzz: ...
6776 */
6777
6778 exprNode lastStmt = exprNode_lastStatement (e1);
6779
6780 if (exprNode_isDefined (lastStmt)
6781 && !exprNode_mustEscape (lastStmt)
6782 && !exprNode_mustBreak (lastStmt)
6783 && !exprNode_isCaseMarker (lastStmt)
6784 && !exprNode_isDefaultMarker (lastStmt)
6785 && !exprNode_isLabelMarker (lastStmt))
6786 {
6787 voptgenerror (FLG_CASEBREAK,
6788 cstring_makeLiteral
2209bcb7 6789 ("Fall through case (no preceding break)"),
616915dd 6790 e2->loc);
6791 }
6792 }
6793 }
6794 }
6795
6796 exprNode_mergeUSs (ret, e2);
28bf4b0b 6797
616915dd 6798 usymtab_setExitCode (ret->exitCode);
6799
6800 if (ret->mustBreak)
6801 {
6802 usymtab_setMustBreak ();
6803 }
6804
abd7f895 6805 DPRINTF (("==> %s", exprNode_unparse (ret)));
616915dd 6806 return ret;
6807}
6808
6809exprNode exprNode_createTok (/*@only@*/ lltok t)
6810{
b73d1009 6811 exprNode ret = exprNode_create (ctype_unknown);
616915dd 6812 ret->kind = XPR_TOK;
6813 ret->edata = exprData_makeTok (t);
6814 return ret;
6815}
6816
6817exprNode exprNode_statement (/*@only@*/ exprNode e, /*@only@*/ lltok t)
6818{
6819 if (!exprNode_isError (e))
6820 {
abd7f895 6821 exprChecks_checkStatementEffect(e);
616915dd 6822 }
6823
6824 return (exprNode_statementError (e, t));
6825}
6826
6827static exprNode exprNode_statementError (/*@only@*/ exprNode e, /*@only@*/ lltok t)
6828{
6829 exprNode ret = exprNode_createPartialCopy (e);
6830
6831 if (!exprNode_isError (e))
6832 {
6833 if (e->kind != XPR_ASSIGN)
6834 {
6835 exprNode_checkUse (ret, e->sref, e->loc);
6836 }
6837
6838 ret->exitCode = e->exitCode;
6839 ret->canBreak = e->canBreak;
6840 ret->mustBreak = e->mustBreak;
6841 }
6842
6843 ret->edata = exprData_makeUop (e, t);
6844 ret->kind = XPR_STMT;
6845
6846 return ret;
6847}
6848
6849exprNode exprNode_checkExpr (/*@returned@*/ exprNode e)
6850{
6851 if (!exprNode_isError (e))
6852 {
6853 if (e->kind != XPR_ASSIGN)
6854 {
6855 exprNode_checkUse (e, e->sref, e->loc);
6856 }
6857 }
6858
6859 return e;
6860}
6861
6862void exprNode_produceGuards (exprNode pred)
6863{
6864 if (!exprNode_isError (pred))
6865 {
6866 if (ctype_isRealPointer (pred->typ))
6867 {
6868 pred->guards = guardSet_addTrueGuard (pred->guards, pred->sref);
6869 }
6870
6871 exprNode_checkUse (pred, pred->sref, pred->loc);
6872 exprNode_resetSref (pred);
6873 }
6874}
6875
abd7f895 6876exprNode exprNode_compoundStatementExpression (/*@only@*/ lltok tlparen, /*@only@*/ exprNode e)
6877{
6878 exprNode laststmt;
6879
6880 DPRINTF (("Compound: %s", exprNode_unparse (e)));
6881
6882 if (!context_flagOn (FLG_GNUEXTENSIONS, exprNode_loc (e)))
6883 {
6884 (void) llgenhinterror
6885 (FLG_SYNTAX,
6886 message ("Compound statement expressions is not supported by ISO C99"),
6887 message ("Use +gnuextensions to allow compound statement expressions (and other GNU language extensions) "
6888 "without this warning"),
6889 exprNode_loc (e));
6890 }
6891
6892 /*
6893 ** The type of a compoundStatementExpression is the type of the last statement
6894 */
6895
6896 llassert (exprNode_isBlock (e));
6897 laststmt = exprNode_lastStatement (e);
6898
6899 DPRINTF (("Last statement: %s / %s", exprNode_unparse (laststmt), ctype_unparse (exprNode_getType (laststmt))));
6900 DPRINTF (("e: %s", exprNode_unparse (e)));
6901 e->typ = exprNode_getType (laststmt);
6902 return exprNode_addParens (tlparen, e);
6903}
6904
6905
616915dd 6906exprNode exprNode_makeBlock (/*@only@*/ exprNode e)
6907{
6908 exprNode ret = exprNode_createPartialCopy (e);
6909
6910 if (!exprNode_isError (e))
6911 {
6912 ret->exitCode = e->exitCode;
6913 ret->canBreak = e->canBreak;
6914 ret->mustBreak = e->mustBreak;
6915 }
6916
abd7f895 6917 DPRINTF (("Block e: %s", exprNode_unparse (e)));
616915dd 6918 ret->edata = exprData_makeSingle (e);
6919 ret->kind = XPR_BLOCK;
abd7f895 6920 DPRINTF (("Block: %s", exprNode_unparse (ret)));
616915dd 6921 return ret;
6922}
6923
6924bool exprNode_isBlock (exprNode e)
6925{
6926 return (exprNode_isDefined (e)
6927 && ((e)->kind == XPR_BLOCK));
6928}
abd7f895 6929
6930bool exprNode_isStatement (exprNode e)
6931{
6932 return (exprNode_isDefined (e)
6933 && ((e)->kind == XPR_STMT));
6934}
616915dd 6935
6936bool exprNode_isAssign (exprNode e)
6937{
6938 if (exprNode_isDefined (e))
6939 {
6940 return (e->kind == XPR_ASSIGN);
6941 }
6942
6943 return FALSE;
6944}
6945
6946bool exprNode_isEmptyStatement (exprNode e)
6947{
6948 return (exprNode_isDefined (e)
6949 && (e->kind == XPR_TOK)
6950 && (lltok_isSemi (exprData_getTok (e->edata))));
6951}
6952
abd7f895 6953bool exprNode_isMultiStatement (exprNode e)
6954{
6955 return (exprNode_isDefined (e)
6956 && ((e->kind == XPR_FOR)
6957 || (e->kind == XPR_FORPRED)
6958 || (e->kind == XPR_IF)
6959 || (e->kind == XPR_IFELSE)
6960 || (e->kind == XPR_WHILE)
6961 || (e->kind == XPR_WHILEPRED)
6962 || (e->kind == XPR_DOWHILE)
6963 || (e->kind == XPR_BLOCK)
6964 || (e->kind == XPR_STMT)
6965 || (e->kind == XPR_STMTLIST)
6966 || (e->kind == XPR_SWITCH)));
6967}
6968
2e127cb8 6969void exprNode_checkIfPred (exprNode pred)
6970{
6971 exprNode_checkPred (cstring_makeLiteralTemp ("if"), pred);
6972}
6973
616915dd 6974exprNode exprNode_if (/*@only@*/ exprNode pred, /*@only@*/ exprNode tclause)
6975{
6976 exprNode ret;
6977 bool emptyErr = FALSE;
6978
6979 if (context_maybeSet (FLG_IFEMPTY))
6980 {
6981 if (exprNode_isEmptyStatement (tclause))
6982 {
6983 emptyErr = optgenerror (FLG_IFEMPTY,
6984 cstring_makeLiteral
6985 ("Body of if statement is empty"),
6986 exprNode_loc (tclause));
6987 }
6988 }
6989
6990 if (!emptyErr && context_maybeSet (FLG_IFBLOCK))
6991 {
6992 if (exprNode_isDefined (tclause)
6993 && !exprNode_isBlock (tclause))
6994 {
6995 voptgenerror (FLG_IFBLOCK,
6996 message
6997 ("Body of if statement is not a block: %s",
6998 exprNode_unparse (tclause)),
6999 exprNode_loc (tclause));
7000 }
7001 }
7002
7003 if (exprNode_isError (pred))
7004 {
7005 if (exprNode_isError (tclause))
7006 {
7ebcc5bb 7007 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
616915dd 7008 }
7009 else
7010 {
7011 ret = exprNode_createPartialCopy (tclause);
7012 }
7013 }
7014 else
7015 {
7016 if (exprNode_mustEscape (pred))
7017 {
7018 voptgenerror
7019 (FLG_UNREACHABLE,
7020 message ("Predicate always exits: %s", exprNode_unparse (pred)),
7021 exprNode_loc (pred));
7022 }
2e127cb8 7023
616915dd 7024 exprNode_checkUse (pred, pred->sref, pred->loc);
7025
7026 if (!exprNode_isError (tclause))
7027 {
7028 exprNode_mergeCondUSs (pred, tclause, exprNode_undefined);
7029 }
7030
7031 ret = exprNode_createPartialCopy (pred);
7032 }
7033
7034 ret->kind = XPR_IF;
7035 ret->edata = exprData_makePair (pred, tclause);
7036
7037 ret->exitCode = XK_UNKNOWN;
7038
7039 if (exprNode_isDefined (tclause))
7040 {
7041 ret->exitCode = exitkind_makeConditional (tclause->exitCode);
7042 ret->canBreak = tclause->canBreak;
7043 ret->sets = sRefSet_union (ret->sets, tclause->sets);
7044 ret->msets = sRefSet_union (ret->msets, tclause->msets);
7045 ret->uses = sRefSet_union (ret->uses, tclause->uses);
7046 }
7047
7048 ret->mustBreak = FALSE;
7049
7050 return ret;
7051}
7052
7053exprNode exprNode_ifelse (/*@only@*/ exprNode pred,
7054 /*@only@*/ exprNode tclause,
7055 /*@only@*/ exprNode eclause)
7056{
7057 exprNode ret;
7058 bool tEmptyErr = FALSE;
7059 bool eEmptyErr = FALSE;
7060
7061 if (context_maybeSet (FLG_IFEMPTY))
7062 {
7063 if (exprNode_isEmptyStatement (tclause))
7064 {
7065 tEmptyErr = optgenerror
7066 (FLG_IFEMPTY,
7067 cstring_makeLiteral
7068 ("Body of if clause of if statement is empty"),
7069 exprNode_loc (tclause));
7070 }
7071
7072 if (exprNode_isEmptyStatement (eclause))
7073 {
7074 eEmptyErr = optgenerror
7075 (FLG_IFEMPTY,
7076 cstring_makeLiteral
7077 ("Body of else clause of if statement is empty"),
7078 exprNode_loc (eclause));
7079 }
7080 }
7081
7082 if (context_maybeSet (FLG_IFBLOCK))
7083 {
7084 if (!tEmptyErr
7085 && exprNode_isDefined (tclause)
7086 && !exprNode_isBlock (tclause))
7087 {
7088 voptgenerror (FLG_IFBLOCK,
7089 message
7090 ("Body of if clause of if statement is not a block: %s",
7091 exprNode_unparse (tclause)),
7092 exprNode_loc (tclause));
7093 }
7094
7095 if (!eEmptyErr
7096 && exprNode_isDefined (eclause)
7097 && !exprNode_isBlock (eclause)
7098 && !(eclause->kind == XPR_IF)
7099 && !(eclause->kind == XPR_IFELSE))
7100 {
7101 voptgenerror
7102 (FLG_IFBLOCK,
7103 message
7104 ("Body of else clause of if statement is not a block: %s",
7105 exprNode_unparse (eclause)),
7106 exprNode_loc (eclause));
7107 }
7108 }
7109
7110 if (context_maybeSet (FLG_ELSEIFCOMPLETE))
7111 {
7112 if (exprNode_isDefined (eclause)
7113 && (eclause->kind == XPR_IF))
7114 {
7115 voptgenerror (FLG_ELSEIFCOMPLETE,
7116 message ("Incomplete else if logic (no final else): %s",
7117 exprNode_unparse (eclause)),
7118 exprNode_loc (eclause));
7119 }
7120 }
7121
7122 if (exprNode_isError (pred))
7123 {
7124 if (exprNode_isError (tclause))
7125 {
7126 if (exprNode_isError (eclause))
7127 {
7ebcc5bb 7128 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
616915dd 7129 }
7130 else
7131 {
7132 ret = exprNode_createPartialCopy (eclause);
7133 }
7134 }
7135 else
7136 {
7137 ret = exprNode_createPartialCopy (tclause);
7138 }
7139 }
7140 else /* pred is okay */
7141 {
7142 ret = exprNode_createPartialCopy (pred);
7143
7144 if (exprNode_mustEscape (pred))
7145 {
7146 voptgenerror
7147 (FLG_UNREACHABLE,
7148 message ("Predicate always exits: %s", exprNode_unparse (pred)),
7149 exprNode_loc (pred));
7150 }
7151
616915dd 7152 exprNode_checkUse (ret, pred->sref, pred->loc);
616915dd 7153 exprNode_mergeCondUSs (ret, tclause, eclause);
7154 }
7155
7156 ret->kind = XPR_IFELSE;
7157 ret->edata = exprData_makeCond (pred, tclause, eclause);
7158
7159 if (exprNode_isDefined (tclause) && exprNode_isDefined (eclause))
7160 {
7161 exprNode_combineControl (ret, tclause, eclause);
7162 ret->loc = fileloc_update (ret->loc, eclause->loc);
7163 }
7164
7165 return ret;
7166}
7167
7168/*
7169** *allpaths <- TRUE iff all executions paths must go through the switch
7170*/
7171
7172static bool
7173checkSwitchExpr (exprNode test, /*@dependent@*/ exprNode e, /*@out@*/ bool *allpaths)
7174{
7175 exprNodeSList el = exprNode_flatten (e);
7176 bool mustReturn = TRUE; /* find a branch that doesn't */
7177 bool thisReturn = FALSE;
7178 bool hasDefault = FALSE;
7179 bool hasAllMembers = FALSE;
7180 bool inSwitch = FALSE;
7181 bool isEnumSwitch = FALSE;
7182 bool canBreak = FALSE;
7183 bool fallThrough = FALSE;
7184 ctype ct = ctype_unknown;
7185 enumNameSList usedEnums;
7186 enumNameList enums;
7187
7188 if (exprNode_isDefined (test))
7189 {
7190 ctype ttype;
7191
7192 ct = test->typ;
7193 ttype = ctype_realType (ct);
7194
7195 if (ctype_isEnum (ttype))
7196 {
7197 isEnumSwitch = TRUE;
7198 enums = ctype_elist (ttype);
7199 usedEnums = enumNameSList_new ();
7200 }
7201 }
7202
7203 exprNodeSList_elements (el, current)
7204 {
c21b4c87 7205
7206 DPRINTF ((message("checkSwitchExpr current = %s ", exprNode_unparse(current) ) ));
7207
616915dd 7208 if (exprNode_isDefined (current))
7209 {
7210 switch (current->kind)
7211 {
7212 case XPR_FTDEFAULT:
7213 case XPR_DEFAULT:
7214 if (hasDefault)
7215 {
7216 voptgenerror
bb7c2085 7217 (FLG_DUPLICATECASES,
616915dd 7218 message ("Duplicate default cases in switch"),
7219 exprNode_loc (current));
7220 }
7221 /*@fallthrough@*/
7222 case XPR_FTCASE:
7223 case XPR_CASE:
7224 if (current->kind == XPR_DEFAULT || current->kind == XPR_FTDEFAULT)
7225 {
7226 hasDefault = TRUE;
7227 }
7228 else
7229 {
7230 if (isEnumSwitch)
7231 {
7232 exprNode st = exprData_getSingle (current->edata);
7233 uentry ue = exprNode_getUentry (st);
7234
7235 if (uentry_isValid (ue))
7236 {
7237 cstring cname = uentry_rawName (ue);
7238
7239 if (enumNameList_member (/*@-usedef@*/enums/*@=usedef@*/, cname))
7240 {
7241 if (enumNameSList_member
7242 (/*@-usedef@*/usedEnums/*@=usedef@*/, cname))
7243 {
7244 voptgenerror
bb7c2085 7245 (FLG_DUPLICATECASES,
616915dd 7246 message ("Duplicate case in switch: %s",
7247 cname),
7248 current->loc);
7249 }
7250 else
7251 {
7252 enumNameSList_addh (usedEnums, cname);
7253 }
7254 }
7255 else
7256 {
7257 voptgenerror
7258 (FLG_TYPE,
7259 message ("Case in switch not %s member: %s",
7260 ctype_unparse (ct), cname),
7261 current->loc);
7262 }
7263 }
7264 }
7265 }
7266
7267 if (inSwitch && !fallThrough)
7268 {
7269 if (!thisReturn || canBreak)
7270 {
7271 mustReturn = FALSE;
7272 }
7273 }
7274
7275 fallThrough = TRUE;
7276 inSwitch = TRUE;
7277 thisReturn = FALSE;
7278 canBreak = FALSE;
7279 /*@switchbreak@*/ break;
7280 default:
7281 thisReturn = thisReturn || exprNode_mustEscape (current);
7282 canBreak = canBreak || current->canBreak;
7283 if (canBreak) fallThrough = FALSE;
7284 }
7285 }
7286 } end_exprNodeSList_elements;
7287
7288 if (inSwitch) /* check the last one! */
7289 {
7290 if (!thisReturn || canBreak)
7291 {
7292 mustReturn = FALSE;
7293 }
7294 }
7295
7296 if (isEnumSwitch)
7297 {
7298 if (!hasDefault
7299 && (enumNameSList_size (/*@-usedef@*/usedEnums/*@=usedef@*/) !=
7300 enumNameList_size (/*@-usedef@*/enums/*@=usedef@*/)))
7301 {
7302 enumNameSList unused = enumNameSList_subtract (enums, usedEnums);
7303
7304 voptgenerror (FLG_MISSCASE,
7305 message ("Missing case%s in switch: %q",
7306 cstring_makeLiteralTemp
7307 ((enumNameSList_size (unused) > 1) ? "s" : ""),
7308 enumNameSList_unparse (unused)),
7309 g_currentloc);
7310
7311 enumNameSList_free (unused);
3e3ec469 7312 *allpaths = FALSE; /* evans 2002-01-01 */
616915dd 7313 }
7314 else
7315 {
7316 hasAllMembers = TRUE;
7317 *allpaths = TRUE;
7318 }
7319
7320 enumNameSList_free (usedEnums);
7321 }
7322 else
7323 {
7324 *allpaths = hasDefault;
7325 }
7326
7327 exprNodeSList_free (el);
7328 return ((hasDefault || hasAllMembers) && mustReturn);
7329}
7330
7331exprNode exprNode_switch (/*@only@*/ exprNode e, /*@only@*/ exprNode s)
7332{
7333 exprNode ret = exprNode_createPartialCopy (e);
7334 bool allpaths;
7335
7336 DPRINTF (("Switch: %s", exprNode_unparse (s)));
7337
7338 ret->kind = XPR_SWITCH;
7339 ret->edata = exprData_makePair (e, s);
7340
7341 if (!exprNode_isError (s))
7342 {
7343 exprNode fs = exprNode_firstStatement (s);
7344 ret->loc = fileloc_update (ret->loc, s->loc);
7345
7346 if (exprNode_isUndefined (fs)
7347 || exprNode_isCaseMarker (fs) || exprNode_isLabelMarker (fs)
7348 || exprNode_isDefaultMarker (fs)) {
7349 ;
7350 } else {
7351 voptgenerror (FLG_FIRSTCASE,
7352 message
7353 ("Statement after switch is not a case: %s", exprNode_unparse (fs)),
7354 fs->loc);
7355 }
7356 }
7357
7358 if (!exprNode_isError (e))
7359 {
7360 if (checkSwitchExpr (e, s, &allpaths))
7361 {
7362 ret->exitCode = XK_MUSTRETURN;
7363 }
7364 else
7365 {
7366 ret->exitCode = e->exitCode;
7367 }
7368
7369 ret->canBreak = e->canBreak;
7370 ret->mustBreak = e->mustBreak;
7371 }
7372 /*
7373 ** forgot this!
7374 ** exprNode.c:3883,32: Variable allpaths used before definition
7375 */
7376 else
7377 {
7378 allpaths = FALSE;
7379 }
7380
7381 DPRINTF (("Context exit switch!"));
7382 context_exitSwitch (ret, allpaths);
7383 DPRINTF (("Context exit switch done!"));
7384
7385 return ret;
7386}
7387
7388static void checkInfiniteLoop (/*@notnull@*/ exprNode test,
7389 /*@notnull@*/ exprNode body)
7390{
7391 sRefSet tuses = test->uses;
7392
7393 if (!sRefSet_isEmpty (test->uses))
7394 {
7395 sRefSet sets = sRefSet_newCopy (body->sets);
7396 bool hasError = TRUE;
7397 bool innerState = FALSE;
7398 sRefSet tuncon = sRefSet_undefined;
7399
7400 sets = sRefSet_union (sets, test->sets);
7401 sets = sRefSet_union (sets, body->msets);
7402 sets = sRefSet_union (sets, test->msets);
7403
7404 sRefSet_allElements (tuses, el)
7405 {
7406 if (sRef_isUnconstrained (el))
7407 {
7408 tuncon = sRefSet_insert (tuncon, el);
7409 }
7410 else
7411 {
7412 if (sRefSet_member (sets, el))
7413 {
7414 hasError = FALSE;
7415 break;
7416 }
7417 }
7418
7419 if (sRef_isInternalState (el)
7420 || sRef_isFileStatic (sRef_getRootBase (el)))
7421 {
7422 innerState = TRUE;
7423 }
7424 } end_sRefSet_allElements ;
7425
7426 if (hasError)
7427 {
7428 sRefSet suncon = sRefSet_undefined;
7429 bool sinner = FALSE;
7430
7431 sRefSet_allElements (sets, el)
7432 {
7433 if (sRef_isUnconstrained (el))
7434 {
7435 suncon = sRefSet_insert (suncon, el);
7436 }
7437 else if (sRef_isInternalState (el))
7438 {
7439 sinner = TRUE;
7440 }
7441 else
7442 {
7443 ;
7444 }
7445 } end_sRefSet_allElements ;
7446
7447 if (sinner && innerState)
7448 {
7449 ;
7450 }
7451 else if (sRefSet_isEmpty (tuncon)
7452 && sRefSet_isEmpty (suncon))
7453 {
7454 voptgenerror
7455 (FLG_INFLOOPS,
7456 message
7457 ("Suspected infinite loop. No value used in loop test (%q) "
7458 "is modified by test or loop body.",
7459 sRefSet_unparsePlain (tuses)),
7460 test->loc);
7461 }
7462 else
7463 {
7464 if (sRefSet_isEmpty (tuncon))
7465 {
7466 voptgenerror
7467 (FLG_INFLOOPSUNCON,
7468 message ("Suspected infinite loop. No condition values "
7469 "modified. Modification possible through "
7470 "unconstrained calls: %q",
7471 sRefSet_unparsePlain (suncon)),
7472 test->loc);
7473 }
7474 else
7475 {
7476 voptgenerror
7477 (FLG_INFLOOPSUNCON,
7478 message ("Suspected infinite loop. No condition values "
7479 "modified. Possible undetected dependency through "
7480 "unconstrained calls in loop test: %q",
7481 sRefSet_unparsePlain (tuncon)),
7482 test->loc);
7483 }
7484 }
7485 }
7486
7487 sRefSet_free (sets);
7488 }
7489}
7490
7491exprNode exprNode_while (/*@keep@*/ exprNode t, /*@keep@*/ exprNode b)
7492{
7493 exprNode ret;
7494 bool emptyErr = FALSE;
616915dd 7495
7496 if (context_maybeSet (FLG_WHILEEMPTY))
7497 {
7498 if (exprNode_isEmptyStatement (b))
7499 {
7500 emptyErr = optgenerror
7501 (FLG_WHILEEMPTY,
7502 cstring_makeLiteral
7503 ("Body of while statement is empty"),
7504 exprNode_loc (b));
7505 }
7506 }
7507
7508 if (!emptyErr && context_maybeSet (FLG_WHILEBLOCK))
7509 {
7510 if (exprNode_isDefined (b)
7511 && !exprNode_isBlock (b))
7512 {
7513 if (context_inIterDef ()
7514 && (b->kind == XPR_STMTLIST
7515 || b->kind == XPR_TOK))
7516 {
7517 ; /* no error */
7518 }
7519 else
7520 {
7521 voptgenerror (FLG_WHILEBLOCK,
7522 message
7523 ("Body of while statement is not a block: %s",
7524 exprNode_unparse (b)),
7525 exprNode_loc (b));
7526 }
7527 }
7528 }
7529
7530 if (exprNode_isError (t))
7531 {
7532 if (exprNode_isError (b))
7533 {
7ebcc5bb 7534 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
616915dd 7535 }
7536 else
7537 {
7538 ret = exprNode_createPartialCopy (b);
7539 }
7540 }
7541 else
7542 {
7543 exprNode test;
7544
7545 ret = exprNode_createPartialCopy (t);
7546
7547 llassert (t->kind == XPR_WHILEPRED);
7548
7549 test = exprData_getSingle (t->edata);
7550
7551 if (!exprNode_isError (b) && exprNode_isDefined (test))
7552 {
7553 if (context_maybeSet (FLG_INFLOOPS)
7554 || context_maybeSet (FLG_INFLOOPSUNCON))
7555 {
7556 /*
7557 ** check that some variable in the predicate is set by the body
7558 ** if the predicate uses any variables
7559 */
7560
7561 checkInfiniteLoop (test, b);
7562 }
7563
7564 exprNode_mergeUSs (ret, b);
7565
7566 if (exprNode_isDefined (b))
7567 {
7568 ret->exitCode = exitkind_makeConditional (b->exitCode);
7569 }
7570 }
7571 }
7572
7573 ret->edata = exprData_makePair (t, b);
7574 ret->kind = XPR_WHILE;
7575
7576 if (exprNode_isDefined (t) && exprNode_mustEscape (t))
7577 {
7578 voptgenerror
bb7c2085 7579 (FLG_ALWAYSEXITS,
616915dd 7580 message ("Predicate always exits: %s", exprNode_unparse (t)),
7581 exprNode_loc (t));
7582 }
7583
7584 ret->exitCode = XK_NEVERESCAPE;
7585
7586 /*
7587 ** If loop is infinite, and there is no break inside,
7588 ** exit code is never reach.
7589 */
7590
7591 if (exprNode_knownIntValue (t))
7592 {
7593 if (!exprNode_isZero (t))
7594 {
7595 if (exprNode_isDefined (b))
7596 {
7597 if (!b->canBreak)
7598 {
7599 /* Really, it means never reached. */
7600 ret->exitCode = XK_MUSTEXIT;
7601 }
7602 }
7603 }
7604 }
7605 else
7606 {
7607 ;
7608 }
7609
7610 ret->canBreak = FALSE;
7611 ret->mustBreak = FALSE;
7612
7613 return ret;
7614}
7615
7616/*
7617** do { b } while (t);
7618**
7619** note: body passed as first argument
7620*/
7621
7622exprNode exprNode_doWhile (/*@only@*/ exprNode b, /*@only@*/ exprNode t)
7623{
7624 exprNode ret;
8f8721fe 7625
7626 DPRINTF (("Do while: %s / %s",
7627 exprNode_unparse (b), exprNode_unparse (t)));
7628
616915dd 7629 if (exprNode_isError (t))
7630 {
7631 if (exprNode_isError (b))
7632 {
7ebcc5bb 7633 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
616915dd 7634 }
7635 else
7636 {
7637 ret = exprNode_createPartialCopy (b);
7638
7639 ret->exitCode = exitkind_makeConditional (b->exitCode);
7640 exprNode_checkUse (ret, b->sref, b->loc);
7641 ret->exitCode = b->exitCode;
7642 ret->canBreak = b->canBreak;
8f8721fe 7643 ret->mustBreak = FALSE;
616915dd 7644 }
7645 }
7646 else
7647 {
8f8721fe 7648 DPRINTF (("Do while: %s / %s",
7649 exitkind_unparse (t->exitCode),
7650 exitkind_unparse (b->exitCode)));
7651
616915dd 7652 ret = exprNode_createPartialCopy (t);
7653 exprNode_checkPred (cstring_makeLiteralTemp ("while"), t);
7654
7655 if (!exprNode_isError (b))
7656 {
7657 /*
7658 ** forgot the copy's --- why wasn't this detected??
7659 */
7660
28bf4b0b 7661 ret->sets = sRefSet_copyInto (ret->sets, b->sets);
7662 ret->msets = sRefSet_copyInto (ret->msets, b->msets);
7663 ret->uses = sRefSet_copyInto (ret->uses, b->uses);
616915dd 7664
7665 /* left this out --- causes and aliasing bug (infinite loop)
7666 should be detected?? */
7667
7668 exprNode_checkUse (ret, b->sref, b->loc);
7669 exprNode_mergeUSs (ret, t);
7670 exprNode_checkUse (ret, t->sref, t->loc);
7671
8f8721fe 7672 /* evans 2001-10-05: while loop can break */
7673 ret->exitCode = exitkind_makeConditional (b->exitCode);
7674
7675 DPRINTF (("Do while: %s",
7676 exitkind_unparse (ret->exitCode)));
7677
616915dd 7678 ret->canBreak = b->canBreak;
8f8721fe 7679
7680 /* Always FALSE for doWhile loops - break's when test is false */
7681 ret->mustBreak = FALSE; /* b->mustBreak; */
616915dd 7682 }
7683 }
7684
7685 context_exitDoWhileClause (t);
7686
7687 ret->kind = XPR_DOWHILE;
7688 ret->edata = exprData_makePair (t, b);
7ebcc5bb 7689 return ret;
616915dd 7690}
7691
3e3ec469 7692bool exprNode_loopMustExec (exprNode forPred)
7693{
7694 /*
7695 ** Returns true if it is obvious that the loop always executes at least once
7696 **
7697 ** For now, we only identify the most obvious cases. Should be true anytime
7698 ** we can prove init => !test.
7699 */
7700
7701 if (exprNode_isDefined (forPred))
7702 {
7703 exprNode init, test, inc;
7704 exprData edata;
7705
7706 llassert (forPred->kind == XPR_FORPRED);
7707
7708 edata = forPred->edata;
7709 init = exprData_getTripleInit (edata);
7710 test = exprData_getTripleTest (edata);
7711 inc = exprData_getTripleInc (edata);
7712
7713 if (exprNode_isAssign (init))
7714 {
7715 exprNode loopVar = exprData_getOpA (init->edata);
7716 exprNode loopInit = exprData_getOpB (init->edata);
7717
7718 if (exprNode_isDefined (test) && test->kind == XPR_OP)
7719 {
7720 exprNode testVar = exprData_getOpA (test->edata);
7721 exprNode testVal = exprData_getOpB (test->edata);
7722 lltok comp = exprData_getOpTok (test->edata);
7723 int opid = lltok_getTok (comp);
7724
7725 DPRINTF (("Same storage: %s / %s", exprNode_unparse (loopVar),
7726 exprNode_unparse (testVar)));
7727
7728 if (exprNode_sameStorage (loopVar, testVar))
7729 {
7730 multiVal valinit = exprNode_getValue (loopInit);
7731 multiVal valtest = exprNode_getValue (testVal);
7732
7733 DPRINTF (("Values: %s / %s", multiVal_unparse (valinit),
7734 multiVal_unparse (valtest)));
7735
7736 if (multiVal_isInt (valinit) && multiVal_isInt (valtest))
7737 {
7738 long v1 = multiVal_forceInt (valinit);
7739 long v2 = multiVal_forceInt (valtest);
7740
7741 DPRINTF (("Here: %ld %ld", v1, v2));
7742
7743 if ((opid == EQ_OP && v1 < v2)
7744 || (opid == NE_OP && v1 != v2)
7745 || (opid == TLT && v1 <= v2)
7746 || (opid == TGT && v1 >= v2)
7747 || (opid == LE_OP && v1 < v2)
7748 || (opid == GE_OP && v1 > v2))
7749 {
7750 DPRINTF (("mustexec if inc"));
7751 return TRUE;
7752 }
7753 }
7754 }
7755 }
7756 }
7757 }
7758
7759 DPRINTF (("loop must exec: FALSE"));
7760 return FALSE;
7761}
7762
616915dd 7763exprNode exprNode_for (/*@keep@*/ exprNode inc, /*@keep@*/ exprNode body)
7764{
7765 exprNode ret;
7766 bool emptyErr = FALSE;
7767
7768 if (context_maybeSet (FLG_FOREMPTY))
7769 {
7770 if (exprNode_isEmptyStatement (body))
7771 {
7772 emptyErr = optgenerror
7773 (FLG_FOREMPTY,
7774 cstring_makeLiteral
7775 ("Body of for statement is empty"),
7776 exprNode_loc (body));
7777 }
7778 }
7779
7780 if (!emptyErr && context_maybeSet (FLG_FORBLOCK))
7781 {
7782 if (exprNode_isDefined (body)
7783 && !exprNode_isBlock (body))
7784 {
7785 if (context_inIterDef ()
7786 && (body->kind == XPR_STMTLIST
7787 || body->kind == XPR_TOK))
7788 {
7789 ; /* no error */
7790 }
7791 else
7792 {
7793 voptgenerror (FLG_FORBLOCK,
7794 message
7795 ("Body of for statement is not a block: %s",
7796 exprNode_unparse (body)),
7797 exprNode_loc (body));
7798 }
7799 }
7800 }
7801
7802 /*
7803 ** for ud purposes: (alreadly) init -> test -> (now) LOOP: body + inc + test
7804 */
7805
7806 if (exprNode_isError (body))
7807 {
7808 ret = exprNode_createPartialCopy (inc);
7809 }
7810 else
7811 {
7812 ret = exprNode_createPartialCopy (body);
7813
7814 ret->exitCode = exitkind_makeConditional (body->exitCode);
7815
3e3ec469 7816 exprNode_mergeUSs (inc, body);
616915dd 7817
7818 if (exprNode_isDefined (inc))
7819 {
7820 exprNode tmp;
7821
7822 context_setMessageAnnote (cstring_makeLiteral ("in post loop increment"));
616915dd 7823
7824 tmp = exprNode_effect (exprData_getTripleInc (inc->edata));
7825 exprNode_freeShallow (tmp);
7826
7827 context_clearMessageAnnote ();
7828 context_setMessageAnnote (cstring_makeLiteral ("in post loop test"));
7829
7830 tmp = exprNode_effect (exprData_getTripleTest (inc->edata));
7831 exprNode_freeShallow (tmp);
7832
7833 context_clearMessageAnnote ();
7834
28bf4b0b 7835 ret->uses = sRefSet_copyInto (ret->uses, inc->uses);
7836 ret->sets = sRefSet_copyInto (ret->sets, inc->sets);
7837 ret->msets = sRefSet_copyInto (ret->msets, inc->msets);
616915dd 7838 }
7839 }
7840
7841 ret->kind = XPR_FOR;
7842 ret->edata = exprData_makePair (inc, body);
7843
7844 if (exprNode_isDefined (inc)) {
7845 exprNode test = exprData_getTripleTest (inc->edata);
7846
7847 if (exprNode_isUndefined (test)) {
7848 if (exprNode_isDefined (body)) {
7849 if (!body->canBreak) {
7850 /* Really, it means never reached. */
7851 ret->exitCode = XK_MUSTEXIT;
7852 }
7853 }
7854 }
7855 }
7856
7857 return (ret);
7858}
7859
7860/*
7861** for (init; test; inc)
7862** ==>
7863** init;
7864** while (test) { body; inc; }
7865**
7866** Now: check use of init (may set vars for test)
7867** check use of test
7868** no checks on inc
7869_*/
7870
7871/*@observer@*/ guardSet exprNode_getForGuards (exprNode pred)
7872{
7873 exprNode test;
7874
7875 if (exprNode_isError (pred)) return guardSet_undefined;
7876
7877 llassert (pred->kind == XPR_FORPRED);
7878
7879 test = exprData_getTripleTest (pred->edata);
7880
7881 if (!exprNode_isError (test))
7882 {
7883 return (test->guards);
7884 }
7885
7886 return guardSet_undefined;
7887}
7888
7889exprNode exprNode_whilePred (/*@only@*/ exprNode test)
7890{
7891 exprNode ret = exprNode_createSemiCopy (test);
7892
7893 if (exprNode_isDefined (test))
7894 {
7895 exprNode_copySets (ret, test);
7896 exprNode_checkPred (cstring_makeLiteralTemp ("while"), test);
7897 exprNode_checkUse (ret, test->sref, test->loc);
7898
7899 exprNode_produceGuards (test);
7900
7901 ret->guards = guardSet_copy (test->guards);
7902 }
7903
7904 ret->edata = exprData_makeSingle (test);
7905 ret->kind = XPR_WHILEPRED;
7906 return ret;
7907}
7908
7909exprNode exprNode_forPred (/*@only@*/ exprNode init, /*@only@*/ exprNode test,
7910 /*@only@*/ exprNode inc)
7911{
7912 exprNode ret;
7913
7914 /*
7915 ** for ud purposes: init -> test -> LOOP: [ body, inc ]
7916 */
7917
7918 exprNode_checkPred (cstring_makeLiteralTemp ("for"), test);
7919
7920 if (!exprNode_isError (inc))
7921 {
7922 ret = exprNode_createPartialCopy (inc);
7923 }
7924 else
7925 {
7926 if (!exprNode_isError (init))
7927 {
7928 ret = exprNode_createPartialCopy (init);
7929 }
7930 else if (!exprNode_isError (test))
7931 {
7932 ret = exprNode_createPartialCopy (test);
7933 }
7934 else
7935 {
7936 ret = exprNode_createUnknown ();
7937 }
7938 }
7939
7940 exprNode_mergeUSs (ret, init);
7941
7942 if (exprNode_isDefined (init))
7943 {
7944 exprNode_checkUse (ret, init->sref, init->loc);
7945 }
7946
7947 exprNode_mergeUSs (ret, test);
7948
7949 if (exprNode_isDefined (test))
7950 {
7951 exprNode_checkUse (ret, test->sref, test->loc);
7952 }
7953
7954 ret->kind = XPR_FORPRED;
7955 ret->edata = exprData_makeFor (init, test, inc);
7956 return (ret);
7957}
7958
7959/*@notnull@*/ /*@only@*/ exprNode exprNode_goto (/*@only@*/ cstring label)
7960{
7961 exprNode ret = exprNode_createUnknown ();
7962
7963 if (context_inMacro ())
7964 {
7965 voptgenerror (FLG_MACROSTMT,
7966 message ("Macro %s uses goto (not functional)",
7967 context_inFunctionName ()),
7968 g_currentloc);
7969 }
7970
7971 ret->kind = XPR_GOTO;
7972 ret->edata = exprData_makeLiteral (label);
7973 ret->mustBreak = TRUE;
7974 ret->exitCode = XK_GOTO;
7975 ret->canBreak = TRUE;
7976 return ret;
7977}
7978
7979exprNode exprNode_continue (/*@only@*/ lltok l, int qcontinue)
7980{
7981 exprNode ret = exprNode_createLoc (ctype_unknown, fileloc_copy (lltok_getLoc (l)));
7982
7983 ret->kind = XPR_CONTINUE;
7984 ret->edata = exprData_makeTok (l);
7985 ret->canBreak = TRUE;
7986 ret->mustBreak = TRUE;
7987
7988 if (qcontinue == QSAFEBREAK)
7989 {
7990 ; /* no checking */
7991 }
7992 else if (qcontinue == QINNERCONTINUE)
7993 {
7994 if (!context_inDeepLoop ())
7995 {
7996 voptgenerror
7997 (FLG_LOOPLOOPCONTINUE,
7998 cstring_makeLiteral ("Continue statement marked with innercontinue "
7999 "is not inside a nested loop"),
8000 exprNode_loc (ret));
8001 }
8002 }
8003 else if (qcontinue == BADTOK)
8004 {
8005 if (context_inDeepLoop ())
8006 {
8007 voptgenerror
8008 (FLG_LOOPLOOPCONTINUE,
8009 cstring_makeLiteral ("Continue statement in nested loop"),
8010 exprNode_loc (ret));
8011 }
8012 }
8013 else
8014 {
8015 llbuglit ("exprNode_continue: bad qcontinue");
8016 }
8017
8018 return ret;
8019}
8020
8021exprNode exprNode_break (/*@only@*/ lltok l, int bqual)
8022{
8023 exprNode ret = exprNode_createLoc (ctype_unknown, fileloc_copy (lltok_getLoc (l)));
8024 clause breakClause = context_breakClause ();
8025
8026 ret->kind = XPR_BREAK;
8027 ret->edata = exprData_makeTok (l);
8028 ret->canBreak = TRUE;
8029 ret->mustBreak = TRUE;
8030
8031 if (breakClause == NOCLAUSE)
8032 {
8033 voptgenerror
8034 (FLG_SYNTAX,
8035 cstring_makeLiteral ("Break not inside while, for or switch statement"),
8036 exprNode_loc (ret));
8037 }
8038 else
8039 {
8040 if (bqual != BADTOK)
8041 {
8042 switch (bqual)
8043 {
8044 case QSAFEBREAK:
8045 break;
8046 case QINNERBREAK:
8047 if (breakClause == SWITCHCLAUSE)
8048 {
8049 if (!context_inDeepSwitch ())
8050 {
8051 voptgenerror (FLG_SYNTAX,
8052 cstring_makeLiteral
8053 ("Break preceded by innerbreak is not in a deep switch"),
8054 exprNode_loc (ret));
8055 }
8056 }
8057 else
8058 {
8059 if (!context_inDeepLoop ())
8060 {
8061 voptgenerror (FLG_SYNTAX,
8062 cstring_makeLiteral
8063 ("Break preceded by innerbreak is not in a deep loop"),
8064 exprNode_loc (ret));
8065 }
8066 }
8067 break;
8068 case QLOOPBREAK:
8069 if (breakClause == SWITCHCLAUSE)
8070 {
8071 voptgenerror (FLG_SYNTAX,
8072 cstring_makeLiteral
8073 ("Break preceded by loopbreak is breaking a switch"),
8074 exprNode_loc (ret));
8075 }
8076 break;
8077 case QSWITCHBREAK:
8078 if (breakClause != SWITCHCLAUSE)
8079 {
8080 voptgenerror
8081 (FLG_SYNTAX,
8082 message ("Break preceded by switchbreak is breaking %s",
8083 cstring_makeLiteralTemp
8084 ((breakClause == WHILECLAUSE
8085 || breakClause == DOWHILECLAUSE) ? "a while loop"
8086 : (breakClause == FORCLAUSE) ? "a for loop"
8087 : (breakClause == ITERCLAUSE) ? "an iterator"
8088 : "<error loop>")),
8089 exprNode_loc (ret));
8090 }
8091 break;
8092 BADDEFAULT;
8093 }
8094 }
8095 else
8096 {
8097 if (breakClause == SWITCHCLAUSE)
8098 {
8099 clause nextBreakClause = context_nextBreakClause ();
8100
8101 switch (nextBreakClause)
8102 {
8103 case NOCLAUSE: break;
8104 case WHILECLAUSE:
8105 case DOWHILECLAUSE:
8106 case FORCLAUSE:
8107 case ITERCLAUSE:
8108 voptgenerror
8109 (FLG_LOOPSWITCHBREAK,
8110 cstring_makeLiteral ("Break statement in switch inside loop"),
8111 exprNode_loc (ret));
8112 break;
8113 case SWITCHCLAUSE:
8114 voptgenerror
8115 (FLG_SWITCHSWITCHBREAK,
8116 cstring_makeLiteral ("Break statement in switch inside switch"),
8117 exprNode_loc (ret));
8118 break;
8119 BADDEFAULT;
8120 }
8121 }
8122 else
8123 {
8124 if (context_inDeepLoop ())
8125 {
8126 voptgenerror
8127 (FLG_LOOPLOOPBREAK,
8128 cstring_makeLiteral ("Break statement in nested loop"),
8129 exprNode_loc (ret));
8130 }
8131 else
8132 {
8133 if (context_inDeepLoopSwitch ())
8134 {
8135 voptgenerror
8136 (FLG_SWITCHLOOPBREAK,
8137 cstring_makeLiteral ("Break statement in loop inside switch"),
8138 exprNode_loc (ret));
8139 }
8140 }
8141 }
8142 }
8143 }
8144
8145 return ret;
8146}
8147
8148exprNode exprNode_nullReturn (/*@only@*/ lltok t)
8149{
8150 fileloc loc = lltok_getLoc (t);
8151 exprNode ret = exprNode_createLoc (ctype_unknown, fileloc_copy (loc));
8152
8153 context_returnFunction ();
8154 exprChecks_checkNullReturn (loc);
8155
8156 ret->kind = XPR_NULLRETURN;
8157 ret->edata = exprData_makeTok (t);
8158 ret->exitCode = XK_MUSTRETURN;
8159 return ret;
8160}
8161
8162exprNode exprNode_return (/*@only@*/ exprNode e)
8163{
8164 exprNode ret;
8165
8166 if (exprNode_isError (e))
8167 {
8168 ret = exprNode_createUnknown ();
8169 }
8170 else
8171 {
8172 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (e->loc));
8173
8174 exprNode_checkUse (ret, e->sref, e->loc);
8175 exprNode_checkReturn (e);
8176 }
8177
8178 context_returnFunction ();
8179 ret->kind = XPR_RETURN;
8180 ret->edata = exprData_makeSingle (e);
8181 ret->exitCode = XK_MUSTRETURN;
8182
8183 return (ret);
8184}
8185
8186exprNode exprNode_comma (/*@only@*/ exprNode e1, /*@only@*/ exprNode e2)
8187{
8188 exprNode ret;
8189
8190 if (exprNode_isError (e1))
8191 {
8192 if (exprNode_isError (e2))
8193 {
7ebcc5bb 8194 ret = exprNode_createLoc (ctype_unknown, fileloc_copy (g_currentloc));
616915dd 8195 }
8196 else
8197 {
8198 ret = exprNode_createPartialCopy (e2);
8199 exprNode_checkUse (ret, e2->sref, e2->loc);
8200 ret->sref = e2->sref;
8201 }
8202 }
8203 else
8204 {
8205 ret = exprNode_createPartialCopy (e1);
8206
8207 exprNode_checkUse (ret, e1->sref, e1->loc);
8208
8209 if (!exprNode_isError (e2))
8210 {
8211 exprNode_mergeUSs (ret, e2);
8212 exprNode_checkUse (ret, e2->sref, e2->loc);
8213 ret->sref = e2->sref;
8214 }
8215 }
8216
8217 ret->kind = XPR_COMMA;
8218 ret->edata = exprData_makePair (e1, e2);
8219
8220 if (exprNode_isDefined (e1))
8221 {
8222 if (exprNode_isDefined (e2))
8223 {
8224 ret->typ = e2->typ;
8225
8226 if (exprNode_mustEscape (e1) || e1->mustBreak)
8227 {
8228 voptgenerror
8229 (FLG_UNREACHABLE,
8230 message ("Second clause of comma expression is unreachable: %s",
8231 exprNode_unparse (e2)),
8232 exprNode_loc (e2));
8233 }
8234
8235 ret->exitCode = exitkind_combine (e1->exitCode, e2->exitCode);
8236 ret->mustBreak = e1->mustBreak || e2->mustBreak;
8237 ret->canBreak = e1->canBreak || e2->canBreak;
8238 }
8239 else
8240 {
8241 if (exprNode_mustEscape (e1) || e1->mustBreak)
8242 {
8243 voptgenerror
8244 (FLG_UNREACHABLE,
8245 message ("Second clause of comma expression is unreachable: %s",
8246 exprNode_unparse (e2)),
8247 exprNode_loc (e2));
8248 }
8249
8250 ret->exitCode = e1->exitCode;
8251 ret->canBreak = e1->canBreak;
8252 }
8253 }
8254 else
8255 {
8256 if (exprNode_isDefined (e2))
8257 {
8258 ret->exitCode = e2->exitCode;
8259 ret->mustBreak = e2->mustBreak;
8260 ret->canBreak = e2->canBreak;
8261 }
8262 }
8263
8264 return (ret);
8265}
8266
8267static bool exprNode_checkOneInit (/*@notnull@*/ exprNode el, exprNode val)
8268{
8269 ctype t1 = exprNode_getType (el);
8270 ctype t2 = exprNode_getType (val);
8271 bool hasError = FALSE;
8272
146e25eb 8273 DPRINTF (("Check one init: %s / %s",
8274 exprNode_unparse (el),
8275 exprNode_unparse (val)));
8276
616915dd 8277 if (ctype_isUnknown (t1))
8278 {
8279 voptgenerror (FLG_IMPTYPE,
8280 message ("Variable has unknown (implicitly int) type: %s",
8281 exprNode_unparse (el)),
8282 el->loc);
8283
8284 t1 = ctype_int;
8285 el->typ = ctype_int;
8286 }
8287
8288 if (exprNode_isDefined (val) && val->kind == XPR_INITBLOCK)
8289 {
8290 exprNodeList vals = exprData_getArgs (val->edata);
077d4458 8291
7534721d 8292 DPRINTF (("Check one init: %s", exprNodeList_unparse (vals)));
8293 DPRINTF (("Type: %s", ctype_unparse (t1)));
8294
616915dd 8295 if (ctype_isRealAP (t1))
8296 {
8297 int i = 0;
8298 int nerrors = 0;
8299
7534721d 8300 if (ctype_isFixedArray (t1))
8301 {
37ae0b5e 8302 size_t nelements = ctype_getArraySize (t1);
7534721d 8303
077d4458 8304 DPRINTF (("Checked array: %s / %d",
8305 ctype_unparse (t1), nelements));
8306
7534721d 8307 if (exprNode_isStringLiteral (val))
8308 {
8309 exprNode_checkStringLiteralLength (t1, val);
8310 }
8311 else
8312 {
37ae0b5e 8313 if (exprNodeList_size (vals) != size_toInt (nelements))
7534721d 8314 {
8315 hasError = optgenerror
37ae0b5e 8316 (exprNodeList_size (vals) > size_toInt (nelements)
8317 ? FLG_INITSIZE : FLG_INITALLELEMENTS,
7534721d 8318 message ("Initializer block for "
8319 "%s has %d element%&, but declared as %s: %q",
8320 exprNode_unparse (el),
8321 exprNodeList_size (vals),
8322 ctype_unparse (t1),
8323 exprNodeList_unparse (vals)),
8324 val->loc);
8325 }
8326 }
8327 }
8328
616915dd 8329 exprNodeList_elements (vals, oneval)
8330 {
8331 cstring istring = message ("%d", i);
8332 exprNode newel =
8333 exprNode_arrayFetch
8334 (exprNode_fakeCopy (el),
8335 exprNode_numLiteral (ctype_int, istring,
8336 fileloc_copy (el->loc), i));
8337
8338 if (exprNode_isDefined (newel))
8339 {
8340 if (exprNodeList_size (vals) == 1
8341 && ctype_isString (exprNode_getType (oneval))
8342 && ctype_isChar (exprNode_getType (newel)))
8343 {
8344 exprNode_freeIniter (newel);
8345 }
8346 else
8347 {
8348 if (exprNode_checkOneInit (newel, oneval))
8349 {
8350 hasError = TRUE;
8351 nerrors++;
8352
8353 if (nerrors > 3 && exprNodeList_size (vals) > 6)
8354 {
8355 llgenmsg
8356 (message ("Additional initialization errors "
8357 "for %s not reported",
8358 exprNode_unparse (el)),
8359 exprNode_loc (el));
8360 exprNode_freeIniter (newel);
8361 break;
8362 }
8363 else
8364 {
8365 exprNode_freeIniter (newel);
8366 }
8367 }
8368 else
8369 {
8370 exprNode_freeIniter (newel);
8371 }
8372 }
8373 }
8374
8375 cstring_free (istring);
8376 i++;
8377 /*@-branchstate@*/
8378 } end_exprNodeList_elements;
8379 /*@=branchstate@*/
8380 }
8381 else if (ctype_isStruct (ctype_realType (t1)))
8382 {
8383 uentryList fields = ctype_getFields (t1);
8384 int i = 0;
8385
8386 if (uentryList_size (fields) != exprNodeList_size (vals))
8387 {
8388 if (uentryList_size (fields) > exprNodeList_size (vals))
8389 {
8390 hasError = optgenerror
8391 (FLG_FULLINITBLOCK,
8392 message ("Initializer block for "
28bf4b0b 8393 "%s has %d field%&, but %s has %d field%&: %q",
616915dd 8394 exprNode_unparse (el),
8395 exprNodeList_size (vals),
8396 ctype_unparse (t1),
8397 uentryList_size (fields),
8398 exprNodeList_unparse (vals)),
8399 val->loc);
8400 }
8401 else
8402 {
8403 hasError = optgenerror
8404 (FLG_TYPE,
8405 message ("Initializer block for "
28bf4b0b 8406 "%s has %d field%&, but %s has %d field%&: %q",
616915dd 8407 exprNode_unparse (el),
8408 exprNodeList_size (vals),
8409 ctype_unparse (t1),
8410 uentryList_size (fields),
8411 exprNodeList_unparse (vals)),
8412 val->loc);
8413 }
8414 }
8415 else
8416 {
8417 exprNodeList_elements (vals, oneval)
8418 {
8419 uentry thisfield = uentryList_getN (fields, i);
8420 exprNode newel =
28bf4b0b 8421 exprNode_fieldAccessAux (exprNode_fakeCopy (el),
8422 exprNode_loc (el),
8423 uentry_getName (thisfield));
616915dd 8424
8425 if (exprNode_isDefined (newel))
8426 {
8427 if (exprNode_checkOneInit (newel, oneval))
8428 {
8429 hasError = TRUE;
8430 }
8431
8432 exprNode_freeIniter (newel);
8433 }
8434
8435 i++;
8436 } end_exprNodeList_elements;
8437 }
8438 }
146e25eb 8439 /* evans 2001-12-30: added to fix bug reported by Jim Zelenka */
8440 else if (ctype_isUnion (ctype_realType (t1)))
8441 {
8442 uentryList fields = ctype_getFields (t1);
8443 int i = 0;
8444
8445 /*
8446 ** Union initializers set the first member always.
8447 */
8448
8449 DPRINTF (("Union initializer: %s / %s",
8450 exprNode_unparse (el), ctype_unparse (ctype_realType (t1))));
8451
8452 if (exprNodeList_size (vals) != 1)
8453 {
8454 hasError = optgenerror
8455 (FLG_TYPE,
8456 message ("Initializer block for union "
8457 "%s has %d elements, union initializers should have one element: %q",
8458 exprNode_unparse (el),
8459 exprNodeList_size (vals),
8460 exprNodeList_unparse (vals)),
8461 val->loc);
8462 }
8463 else
8464 {
8465 exprNode oneval = exprNodeList_head (vals);
8466 uentry thisfield = uentryList_getN (fields, i);
8467 exprNode newel =
8468 exprNode_fieldAccessAux (exprNode_fakeCopy (el),
8469 exprNode_loc (el),
8470 uentry_getName (thisfield));
8471
8472 if (exprNode_isDefined (newel))
8473 {
8474 if (exprNode_checkOneInit (newel, oneval))
8475 {
8476 hasError = TRUE;
8477 }
8478
8479 exprNode_freeIniter (newel);
8480 }
8481 }
8482 }
616915dd 8483 else
8484 {
8485 hasError = optgenerror
8486 (FLG_TYPE,
8487 message ("Initializer block used for "
8488 "%s where %t is expected: %s",
8489 exprNode_unparse (el), t1, exprNode_unparse (val)),
8490 val->loc);
8491 }
8492 }
8493 else
8494 {
8495 if (exprNode_isDefined (val))
8496 {
8497 doAssign (el, val, TRUE);
8498
8499 if (!exprNode_matchType (t1, val))
8500 {
8501 hasError = gentypeerror
8502 (t1, val, t2, el,
8503 message ("Initial value of %s is type %t, "
8504 "expects %t: %s",
8505 exprNode_unparse (el),
8506 t2, t1, exprNode_unparse (val)),
8507 val->loc);
8508 }
8509 }
8510 }
8511
8512 return hasError;
8513}
8514
abd7f895 8515static /*@notnull@*/ exprNode
28bf4b0b 8516exprNode_makeInitializationAux (/*@temp@*/ idDecl t)
8517{
8518 exprNode ret;
8519
146e25eb 8520 DPRINTF (("Initialization: %s", idDecl_unparse (t)));
8521
28bf4b0b 8522 if (usymtab_exists (idDecl_observeId (t)))
8523 {
8524 uentry ue = usymtab_lookup (idDecl_observeId (t));
8525 ret = exprNode_createId (ue);
28bf4b0b 8526 }
8527 else
8528 {
7ebcc5bb 8529 uentry ue;
8530
8531 DPRINTF (("Unrecognized: %s", idDecl_unparse (t)));
8532
8533 ue = uentry_makeUnrecognized (idDecl_observeId (t), fileloc_copy (g_currentloc));
28bf4b0b 8534 ret = exprNode_fromIdentifierAux (ue);
8535
8536 /*
8537 ** No error - this happens in old style declarations:
8538
8539 voptgenerror
8540 (FLG_UNRECOG,
8541 message ("Unrecognized identifier in intializer: %s", idDecl_observeId (t)),
8542 g_currentloc);
8543
8544 **
8545 */
8546 }
8547
8548 exprData_free (ret->edata, ret->kind);
8549 ret->edata = exprData_undefined;
8550 ret->exitCode = XK_NEVERESCAPE;
8551 ret->mustBreak = FALSE;
8552 ret->kind = XPR_INIT;
8553 return ret;
8554}
8555
8556exprNode exprNode_makeEmptyInitialization (/*@only@*/ idDecl t)
8557{
8558 exprNode ret = exprNode_makeInitializationAux (t);
8559 llassert (ret->edata == exprData_undefined);
8560 ret->edata = exprData_makeInit (t, exprNode_undefined);
8561 return ret;
8562}
8563
616915dd 8564exprNode exprNode_makeInitialization (/*@only@*/ idDecl t,
8565 /*@only@*/ exprNode e)
8566{
8567 uentry ue = usymtab_lookup (idDecl_observeId (t));
28bf4b0b 8568 exprNode ret = exprNode_makeInitializationAux (t);
8569 fileloc loc = exprNode_loc (e);
02b84d4b 8570
8571 DPRINTF (("initialization: %s = %s", idDecl_unparse (t), exprNode_unparse (e)));
8572
616915dd 8573 if (exprNode_isError (e))
8574 {
8575 e = exprNode_createUnknown ();
616915dd 8576 /* error: assume initializer is defined */
28bf4b0b 8577 sRef_setDefined (ret->sref, g_currentloc);
02b84d4b 8578 ret->edata = exprData_makeInit (t, e);
616915dd 8579 }
8580 else
8581 {
28bf4b0b 8582 ctype ct = ctype_realishType (ret->typ);
8583
616915dd 8584 /*
8585 ** evs - 9 Apr 1995
8586 **
8587 ** was addSafeUse --- what's the problem?
8588 **
8589 ** int x = 3, y = x ?
8590 */
8591
28bf4b0b 8592 exprData_free (ret->edata, ret->kind);
8593 ret->edata = exprData_makeInit (t, e);
02b84d4b 8594 DPRINTF (("ret: %s", exprNode_unparse (ret)));
28bf4b0b 8595
616915dd 8596 exprNode_checkUse (ret, e->sref, e->loc);
8597
8598 if (ctype_isUnknown (e->typ) && uentry_isValid (ue))
8599 {
8600 exprNode lhs = exprNode_createId (ue);
8601
8602 /*
8603 ** static storage should be undefined before initializing
8604 */
8605
8606 if (uentry_isStatic (ue))
8607 {
8608 sRef_setDefState (lhs->sref, SS_PARTIAL, fileloc_undefined);
8609 }
146e25eb 8610
616915dd 8611 (void) exprNode_checkOneInit (lhs, e);
8612
8613 if (uentry_isStatic (ue))
8614 {
8615 sRef_setDefState (lhs->sref, SS_DEFINED, fileloc_undefined);
8616 }
8617
8618 exprNode_free (lhs);
8619 }
8620 else
8621 {
8622 if (!exprNode_matchType (ct, e))
8623 {
8624 if (exprNode_isZero (e) && ctype_isArrayPtr (ct))
8625 {
8626 ;
8627 }
8628 else
8629 {
8630 (void) gentypeerror
8631 (exprNode_getType (e), e, exprNode_getType (ret), ret,
8632 message
28bf4b0b 8633 ("Variable %q initialized to type %t, expects %t: %s",
8634 uentry_getName (ue), exprNode_getType (e),
616915dd 8635 exprNode_getType (ret),
8636 exprNode_unparse (e)),
8637 e->loc);
8638 }
8639 }
8640 }
8641
8642 if (uentry_isStatic (ue))
8643 {
8644 sRef_setDefState (ret->sref, SS_PARTIAL, fileloc_undefined);
8645 }
37ae0b5e 8646
02b84d4b 8647 if (exprNode_isStringLiteral (e)
8648 && (ctype_isArray (ct))
8649 && (ctype_isChar (ctype_realType (ctype_baseArrayPtr (ct)))))
8650 {
8651 /*
8652 ** If t is a char [], the literal is copied.
8653 */
8654
37ae0b5e 8655 exprNode_checkStringLiteralLength (ct, e);
8656 sRef_setDefState (ret->sref, SS_DEFINED, e->loc);
8657 ret->val = multiVal_copy (e->val);
616915dd 8658
37ae0b5e 8659 sRef_setNullTerminatedState (ret->sref);
8660
02b84d4b 8661 if (multiVal_isDefined (e->val))
8662 {
37ae0b5e 8663 cstring slit = multiVal_forceString (e->val);
e5081f8c 8664 sRef_setLen (ret->sref, size_toInt (cstring_length (slit) + 1));
02b84d4b 8665 }
8666
37ae0b5e 8667 if (ctype_isFixedArray (ct))
02b84d4b 8668 {
37ae0b5e 8669 sRef_setSize (ret->sref, size_toInt (ctype_getArraySize (ct)));
02b84d4b 8670 }
8671 }
8672 else
02b84d4b 8673 {
8674 doAssign (ret, e, TRUE);
8675 }
616915dd 8676
8677 if (uentry_isStatic (ue))
8678 {
8679 sRef_setDefState (ret->sref, SS_DEFINED, fileloc_undefined);
8680 }
8681 }
02b84d4b 8682
616915dd 8683 if (context_inIterDef ())
8684 {
8685 /* should check if it is yield */
8686 uentry_setUsed (ue, loc);
8687 }
8688 else
8689 {
28bf4b0b 8690 ;
616915dd 8691 }
8692
616915dd 8693 exprNode_mergeUSs (ret, e);
02b84d4b 8694 DPRINTF (("Ret: %s %p %p",
8695 exprNode_unparse (ret),
8696 ret->requiresConstraints,
8697 ret->ensuresConstraints));
8698
8699 DPRINTF (("Ret: %s %s %s",
8700 exprNode_unparse (ret),
8701 constraintList_unparse (ret->requiresConstraints),
8702 constraintList_unparse (ret->ensuresConstraints)));
616915dd 8703 return ret;
8704}
8705
8706exprNode exprNode_iter (/*@observer@*/ uentry name,
8707 /*@only@*/ exprNodeList alist,
8708 /*@only@*/ exprNode body,
8709 /*@observer@*/ uentry end)
8710{
8711 exprNode ret;
8712 cstring iname;
8713
8714 llassert (uentry_isValid (name));
8715
8716 uentry_setUsed (name, exprNode_loc (body));
8717
8718 ret = exprNode_createPartialCopy (body);
8719 iname = uentry_getName (name);
8720
8721 if (uentry_isInvalid (end))
8722 {
bb7c2085 8723 llerror (FLG_ITERBALANCE,
616915dd 8724 message ("Iter %s not balanced with end_%s", iname, iname));
8725 }
8726 else
8727 {
8728 cstring ename = uentry_getName (end);
8729
68de3f33 8730 if (!cstring_equalPrefixLit (ename, "end_"))
616915dd 8731 {
bb7c2085 8732 llerror (FLG_ITERBALANCE, message ("Iter %s not balanced with end_%s: %s",
616915dd 8733 iname, iname, ename));
8734 }
8735 else
8736 {
8737 if (!cstring_equal (iname, cstring_suffix (ename, 4)))
8738 {
bb7c2085 8739 llerror (FLG_ITERBALANCE,
616915dd 8740 message ("Iter %s not balanced with end_%s: %s",
8741 iname, iname, ename));
8742 }
8743 }
8744
8745 cstring_free (ename);
8746 }
8747
8748 context_exitIterClause (body);
8749
8750 ret->kind = XPR_ITER;
8751 ret->edata = exprData_makeIter (name, alist, body, end);
8752
8753 if (uentry_isIter (name))
8754 {
8755 (void) checkArgsReal (name, body,
8756 uentry_getParams (name), alist, TRUE, ret);
8757 }
8758
8759 cstring_free (iname);
8760
8761 return ret;
8762}
8763
8764exprNode
8765exprNode_iterNewId (/*@only@*/ cstring s)
8766{
8767 exprNode e = exprNode_new ();
8768 uentry ue = uentryList_getN (uentry_getParams (getCurrentIter ()), iterParamNo ());
8769
8770 llassert (processingIterVars ());
8771
8772 e->loc = context_getSaveLocation ();
8773
8774 if (fileloc_isUndefined (e->loc))
8775 {
8776 fileloc_free (e->loc);
8777 e->loc = fileloc_copy (g_currentloc);
8778 }
8779
8780 e->uses = sRefSet_new ();
8781 e->sets = sRefSet_new ();
8782 e->msets = sRefSet_new ();
8783 e->kind = XPR_VAR;
8784 e->val = multiVal_unknown ();
8785 e->guards = guardSet_new ();
02b84d4b 8786 e->sref = sRef_undefined;
616915dd 8787 e->isJumpPoint = FALSE;
8788 e->exitCode = XK_NEVERESCAPE;
8789
1b8ae690 8790 /*> missing fields, detected by splint <*/
616915dd 8791 e->canBreak = FALSE;
8792 e->mustBreak = FALSE;
8793 e->etext = cstring_undefined;
8794
8795 if (uentry_isYield (ue))
8796 {
8797 uentry uue = uentry_makeVariable (s, uentry_getType (ue),
8798 fileloc_copy (e->loc),
8799 FALSE);
8800 sRef sr;
8801
8802 uue = usymtab_supEntrySrefReturn (uue);
8803
8804 sr = uentry_getSref (uue);
8805 sRef_mergeStateQuiet (sr, uentry_getSref (ue));
8806 sr = uentry_getSref (uue);
8807 sRef_setDefined (sr, e->loc);
8808
8809 e->typ = uentry_getType (uue);
8810 e->sref = sr;
8811 e->edata = exprData_makeId (uue);
8812 uentry_setUsed (uue, g_currentloc);
8813 }
8814 else
8815 {
8816 uentry uue;
8817
8818 sRef_setGlobalScope ();
8819 uue = uentry_makeVariableLoc (s, ctype_unknown);
8820
8821 e->typ = ctype_unknown;
8822 e->edata = exprData_makeId (uue);
8823
8824 uentry_setUsed (uue, e->loc);
8825 uentry_setHasNameError (uue);
8826
8827 if (context_getFlag (FLG_REPEATUNRECOG))
8828 {
8829 uentry_markOwned (uue);
8830 }
8831 else
8832 {
8833 usymtab_supGlobalEntry (uue);
8834 }
8835
8836 sRef_clearGlobalScope ();
8837
8838 voptgenerror (FLG_UNRECOG, message ("Unrecognized identifier: %s", s),
8839 e->loc);
8840 }
8841
8842
8843 cstring_free (s);
84c9ffbf 8844
8845 exprNode_defineConstraints(e);
616915dd 8846 return (e);
8847}
8848
8849exprNode
8850exprNode_iterExpr (/*@returned@*/ exprNode e)
8851{
8852 if (!processingIterVars ())
8853 {
8854 llcontbuglit ("checkIterParam: not in iter");
8855 return e;
8856 }
8857
8858 if (uentry_isYield (uentryList_getN (uentry_getParams (getCurrentIter ()),
8859 iterParamNo ())))
8860 {
8861 if (exprNode_isDefined (e))
8862 {
8863 if (fileloc_isDefined (e->loc))
8864 {
8865 voptgenerror
bb7c2085 8866 (FLG_ITERYIELD,
616915dd 8867 message ("Yield parameter is not simple identifier: %s",
8868 exprNode_unparse (e)),
8869 e->loc);
8870 }
8871 else
8872 {
8873 voptgenerror
bb7c2085 8874 (FLG_ITERYIELD,
616915dd 8875 message ("Yield parameter is not simple identifier: %s",
8876 exprNode_unparse (e)),
8877 g_currentloc);
8878
8879 }
8880 }
8881 }
8882 return e;
8883}
8884
8885exprNode
8886exprNode_iterId (/*@observer@*/ uentry c)
8887{
8888 uentry ue;
8889
8890 llassert (processingIterVars ());
8891
8892 ue = uentryList_getN (uentry_getParams (getCurrentIter ()),
8893 iterParamNo ());
8894
8895 if (uentry_isYield (ue))
8896 {
8897 ctype ct = uentry_getType (ue);
8898 exprNode e = exprNode_createPlain (ct);
8899 cstring name = uentry_getName (c);
8900 uentry le = uentry_makeVariable (name, ct, fileloc_undefined, FALSE);
8901
8902 uentry_setUsed (ue, g_currentloc);
8903 uentry_setHasNameError (ue);
8904
8905 cstring_free (name);
8906
8907 e->kind = XPR_VAR;
8908 e->edata = exprData_makeId (le);
8909 e->loc = context_getSaveLocation ();
8910 e->sref = uentry_getSref (le);
8911
8912 usymtab_supEntrySref (le);
8913
8914 if (!context_inHeader ())
8915 {
8916 if (optgenerror
bb7c2085 8917 (FLG_ITERYIELD,
616915dd 8918 message ("Yield parameter shadows local declaration: %q",
8919 uentry_getName (c)),
8920 fileloc_isDefined (e->loc) ? e->loc : g_currentloc))
8921 {
8922 uentry_showWhereDeclared (c);
8923 }
8924 }
8925
8926 return e;
8927 }
8928
8929 return (exprNode_fromIdentifierAux (c));
8930}
8931
8932exprNode exprNode_iterStart (/*@observer@*/ uentry name, /*@only@*/ exprNodeList alist)
8933{
8934 exprNode ret = exprNode_create (ctype_unknown);
8935
8936 ret->kind = XPR_ITERCALL;
8937 ret->edata = exprData_makeIterCall (name, alist);
8938
8939 if (uentry_isIter (name))
8940 {
8941 uentryList params = uentry_getParams (name);
8942
8943 if (context_inIterDef ()
8944 && uentryList_size (params) == exprNodeList_size (alist))
8945 {
8946 int i = 0;
8947
8948 exprNodeList_elements (alist, arg)
8949 {
8950 uentry parg = uentryList_getN (params, i);
8951
8952 if (uentry_isYield (parg))
8953 {
8954 uentry ue = exprNode_getUentry (arg);
8955
8956 if (uentry_isValid (ue))
8957 {
8958 ;
8959 }
8960 }
8961
8962 i++;
8963 } end_exprNodeList_elements;
8964 }
8965
8966 (void) checkArgsReal (name, ret, params, alist, TRUE, ret);
8967 checkUnspecCall (ret, params, alist);
8968 }
8969
8970 return ret;
8971}
8972
8973/*@exposed@*/ sRef exprNode_getSref (exprNode e)
8974{
8975 if (exprNode_isDefined (e))
8976 {
02b84d4b 8977 if (sRef_isInvalid (e->sref))
616915dd 8978 {
8979 /*@-mods@*/
8980 e->sref = sRef_makeUnknown ();
8981 sRef_setAliasKind (e->sref, AK_ERROR, fileloc_undefined);
8982 /*@=mods@*/
8983 return e->sref;
8984 }
8985 else
8986 {
8987 return e->sref;
8988 }
8989 }
8990 else
8991 {
8992 return sRef_undefined;
8993 }
8994}
8995
8996/*@observer@*/ cstring
8997exprNode_unparseFirst (exprNode e)
8998{
8999 if (exprNode_isDefined (e))
9000 {
9001 cstring ret;
9002
9003 if (e->kind == XPR_STMTLIST
9004 || e->kind == XPR_COMMA || e->kind == XPR_COND)
9005 {
9006 exprNode first = exprData_getPairA (e->edata);
9007
9008 if (exprNode_isDefined (first))
9009 {
9010 return (exprNode_unparseFirst (exprData_getPairA (e->edata)));
9011 }
9012 else
9013 {
9014 return (cstring_makeLiteralTemp ("..."));
9015 }
9016 }
9017
9018 ret = cstring_elide (exprNode_unparse (e), 20);
9019 cstring_markOwned (ret);
9020
9021 return (ret);
9022 }
9023 else
9024 {
9025 return cstring_makeLiteralTemp ("<error>");
9026 }
9027}
9028
9029/*@observer@*/ cstring
28bf4b0b 9030exprNode_unparse (/*@temp@*/ exprNode e)
616915dd 9031{
9032 if (exprNode_isError (e))
9033 {
9034 return cstring_makeLiteralTemp ("<error>");
9035 }
9036
9037 if (cstring_isDefined (e->etext))
9038 {
9039 return e->etext;
9040 }
9041 else
9042 {
9043 cstring ret = exprNode_doUnparse (e);
9044
9045 /*@-modifies@*/ /* benevolent */
9046 e->etext = ret;
9047 /*@=modifies@*/
9048 return ret;
9049 }
9050}
9051
9052/*@observer@*/ fileloc
9053exprNode_loc (exprNode e)
9054{
9055 if (exprNode_isError (e))
9056 {
9057 return (g_currentloc);
9058 }
9059 else
9060 {
9061 return (e->loc);
9062 }
9063}
9064
9065/*
9066** executes exprNode e
9067** recursively rexecutes as though in original parse using
9068** information in e->edata
9069*/
9070
9071static /*@only@*/ exprNodeList exprNodeList_effect (exprNodeList e)
9072{
9073 exprNodeList ret = exprNodeList_new ();
9074
9075 exprNodeList_elements (e, current)
9076 {
9077 exprNodeList_addh (ret, exprNode_effect (current));
9078 } end_exprNodeList_elements;
9079
9080 return ret;
9081}
9082
9083static /*@only@*/ exprNode exprNode_effect (exprNode e)
9084 /*@globals internalState@*/
9085{
9086 bool innerEffect = inEffect;
9087 exprNode ret;
9088 exprData data;
9089
9090 inEffect = TRUE;
9091
9092 context_clearJustPopped ();
9093
9094 if (exprNode_isError (e))
9095 {
9096 ret = exprNode_undefined;
9097 }
9098 else
9099 {
9100 /*
9101 ** Turn off expose and dependent transfer checking.
9102 ** Need to pass exposed internal nodes,
9103 ** [ copying would be a waste! ]
9104 ** [ Actually, I think I wasted a lot more time than its worth ]
9105 ** [ trying to do this. ]
9106 */
9107
9108 /*@-exposetrans@*/
9109 /*@-observertrans@*/
9110 /*@-dependenttrans@*/
9111
9112 data = e->edata;
9113
9114 switch (e->kind)
9115 {
9116 case XPR_PARENS:
9117 ret = exprNode_addParens (exprData_getUopTok (data),
9118 exprNode_effect (exprData_getUopNode (data)));
9119 break;
9120 case XPR_ASSIGN:
9121 ret = exprNode_assign (exprNode_effect (exprData_getOpA (data)),
9122 exprNode_effect (exprData_getOpB (data)),
9123 exprData_getOpTok (data));
9124 break;
9125 case XPR_INITBLOCK:
9126 ret = exprNode_undefined;
9127 break;
9128 case XPR_CALL:
9129 ret = exprNode_functionCall (exprNode_effect (exprData_getFcn (data)),
9130 exprNodeList_effect (exprData_getArgs (data)));
9131 break;
9132 case XPR_EMPTY:
9133 ret = e;
9134 break;
9135
9136 case XPR_LABEL:
9137 ret = e;
9138 break;
9139
9140 case XPR_CONST:
9141 case XPR_VAR:
9142 {
9143 cstring id = exprData_getId (data);
9144 uentry ue = usymtab_lookupSafe (id);
9145
9146 ret = exprNode_fromIdentifierAux (ue);
9147 ret->loc = fileloc_update (ret->loc, e->loc);
9148 break;
9149 }
9150 case XPR_BODY:
9151 ret = e;
9152 break;
9153 case XPR_FETCH:
9154 ret = exprNode_arrayFetch (exprNode_effect (exprData_getPairA (data)),
9155 exprNode_effect (exprData_getPairB (data)));
9156 break;
9157 case XPR_OP:
52e90c0f 9158 /*
9159 ** evans 2002-03-15: for && and ||, need to do the guards also
9160 ** this is what cgrammar.y does - should be
9161 ** able to avoid duplication, but need to
9162 ** time with grammar productions.
9163 */
9164
9165 DPRINTF (("Effect: %s", exprNode_unparse (e)));
9166
9167 if (lltok_getTok (exprData_getOpTok (data)) == AND_OP)
9168 {
9169 exprNode e1 = exprNode_effect (exprData_getOpA (data));
9170 exprNode e2;
9171 exprNode_produceGuards (e1);
9172 context_enterAndClause (e1);
9173 e2 = exprNode_effect (exprData_getOpB (data));
9174
9175 ret = exprNode_op (e1, e2,
9176 exprData_getOpTok (data));
9177
9178 context_exitAndClause (ret, e2);
9179 }
9180 else if (lltok_getTok (exprData_getOpTok (data)) == OR_OP)
9181 {
9182 exprNode e1 = exprNode_effect (exprData_getOpA (data));
9183 exprNode e2;
9184 exprNode_produceGuards (e1);
9185 context_enterOrClause (e1);
9186 e2 = exprNode_effect (exprData_getOpB (data));
9187
9188 ret = exprNode_op (e1, e2,
9189 exprData_getOpTok (data));
9190
9191 context_exitOrClause (ret, e2);
9192 }
9193 else
9194 {
9195 ret = exprNode_op (exprNode_effect (exprData_getOpA (data)),
9196 exprNode_effect (exprData_getOpB (data)),
9197 exprData_getOpTok (data));
9198 }
616915dd 9199 break;
9200
9201 case XPR_POSTOP:
9202 ret = exprNode_postOp (exprNode_effect (exprData_getUopNode (data)),
9203 exprData_getUopTok (data));
9204 break;
9205 case XPR_PREOP:
9206 ret = exprNode_preOp (exprNode_effect (exprData_getUopNode (data)),
9207 exprData_getUopTok (data));
9208 break;
9209
9210 case XPR_OFFSETOF:
9211 case XPR_SIZEOFT:
9212 case XPR_SIZEOF:
9213 case XPR_ALIGNOFT:
9214 case XPR_ALIGNOF:
9215 ret = e;
9216 break;
9217
9218 case XPR_VAARG:
9219 ret = exprNode_vaArg (exprData_getCastTok (data),
9220 exprNode_effect (exprData_getCastNode (data)),
9221 exprData_getCastType (data));
9222 break;
9223
9224 case XPR_CAST:
9225 ret = exprNode_cast (exprData_getCastTok (data),
9226 exprNode_effect (exprData_getCastNode (data)),
9227 exprData_getCastType (data));
9228 break;
9229 case XPR_ITERCALL:
9230 ret = exprNode_iterStart (exprData_getIterCallIter (data),
9231 exprNodeList_effect
9232 (exprData_getIterCallArgs (data)));
9233 break;
9234
9235 case XPR_ITER:
9236 ret = exprNode_iter (exprData_getIterSname (data),
9237 exprNodeList_effect (exprData_getIterAlist (data)),
9238 exprNode_effect (exprData_getIterBody (data)),
9239 exprData_getIterEname (data));
9240 break;
9241
9242 case XPR_FOR:
9243 ret = exprNode_for (exprNode_effect (exprData_getPairA (data)),
9244 exprNode_effect (exprData_getPairB (data)));
9245 break;
9246
9247 case XPR_FORPRED:
9248 ret = exprNode_forPred (exprNode_effect (exprData_getTripleInit (data)),
9249 exprNode_effect (exprData_getTripleTest (data)),
9250 exprNode_effect (exprData_getTripleInc (data)));
9251 break;
9252
9253 case XPR_TOK:
9254 ret = exprNode_createTok (exprData_getTok (data));
9255 break;
9256
9257 case XPR_GOTO:
9258 ret = exprNode_goto (exprData_getLiteral (data));
9259 ret->loc = fileloc_update (ret->loc, e->loc);
9260 break;
9261
9262 case XPR_CONTINUE:
9263 ret = exprNode_continue (exprData_getTok (data), QSAFEBREAK);
9264 break;
9265
9266 case XPR_BREAK:
9267 ret = exprNode_break (exprData_getTok (data), QSAFEBREAK);
9268 break;
9269
9270 case XPR_RETURN:
9271 ret = exprNode_return (exprNode_effect (exprData_getSingle (data)));
9272 break;
9273
9274 case XPR_NULLRETURN:
9275 ret = exprNode_nullReturn (exprData_getTok (data));
9276 break;
9277
9278 case XPR_COMMA:
9279 ret = exprNode_comma (exprNode_effect (exprData_getPairA (data)),
9280 exprNode_effect (exprData_getPairB (data)));
9281 break;
9282
9283 case XPR_COND:
9284 ret = exprNode_cond (exprNode_effect (exprData_getTriplePred (data)),
9285 exprNode_effect (exprData_getTripleTrue (data)),
9286 exprNode_effect (exprData_getTripleFalse (data)));
9287 break;
9288 case XPR_IF:
9289 ret = exprNode_if (exprNode_effect (exprData_getPairA (data)),
9290 exprNode_effect (exprData_getPairB (data)));
9291 break;
9292
9293 case XPR_IFELSE:
9294 ret = exprNode_ifelse (exprNode_effect (exprData_getTriplePred (data)),
9295 exprNode_effect (exprData_getTripleTrue (data)),
9296 exprNode_effect (exprData_getTripleFalse (data)));
9297 break;
9298 case XPR_WHILEPRED:
9299 ret = exprNode_whilePred (exprData_getSingle (data));
9300 break;
9301
9302 case XPR_WHILE:
9303 ret = exprNode_while (exprNode_effect (exprData_getPairA (data)),
9304 exprNode_effect (exprData_getPairB (data)));
9305 break;
9306
9307 case XPR_DOWHILE:
9308 ret = exprNode_doWhile (exprNode_effect (exprData_getPairA (data)),
9309 exprNode_effect (exprData_getPairB (data)));
9310 break;
9311
9312 case XPR_BLOCK:
9313 ret = exprNode_makeBlock (exprNode_effect (exprData_getSingle (data)));
9314 break;
9315
9316 case XPR_STMT:
9317 ret = exprNode_statement (exprNode_effect (exprData_getUopNode (data)),
9318 exprData_getUopTok (data));
9319 break;
9320
9321 case XPR_STMTLIST:
9322 ret = exprNode_concat (exprNode_effect (exprData_getPairA (data)),
9323 exprNode_effect (exprData_getPairB (data)));
9324 break;
9325
9326 case XPR_FTCASE:
9327 case XPR_CASE:
9328 ret = exprNode_caseMarker
9329 (exprNode_effect (exprData_getSingle (data)),
9330 TRUE);
9331 break;
9332
9333 case XPR_FTDEFAULT:
9334 case XPR_DEFAULT:
9335 ret = exprNode_createTok (exprData_getTok (data));
9336 break;
9337
9338 case XPR_SWITCH:
9339 ret = exprNode_switch (exprNode_effect (exprData_getPairA (data)),
9340 exprNode_effect (exprData_getPairB (data)));
9341 break;
9342
9343 case XPR_INIT:
9344 ret = exprNode_makeInitialization
9345 (exprData_getInitId (data),
9346 exprNode_effect (exprData_getInitNode (data)));
9347 break;
9348
9349 case XPR_FACCESS:
28bf4b0b 9350 ret = exprNode_fieldAccessAux
9351 (exprNode_effect (exprData_getFieldNode (data)),
9352 exprNode_loc (exprData_getFieldNode (data)),
9353 cstring_copy (exprData_getFieldName (data)));
616915dd 9354 break;
9355
9356 case XPR_ARROW:
28bf4b0b 9357 ret = exprNode_arrowAccessAux
9358 (exprNode_effect (exprData_getFieldNode (data)),
9359 exprNode_loc (exprData_getFieldNode (data)),
9360 cstring_copy (exprData_getFieldName (data)));
616915dd 9361 break;
9362
9363 case XPR_STRINGLITERAL:
9364 ret = e;
9365 break;
9366
9367 case XPR_NUMLIT:
9368 ret = e;
9369 break;
9370
9371 case XPR_NODE:
9372 ret = e;
9373 break;
9374 /*@-branchstate@*/
9375 }
9376 /*@=branchstate@*/
9377 /*@=observertrans@*/
9378 /*@=exposetrans@*/
9379 /*@=dependenttrans@*/
9380 }
9381
9382 if (!innerEffect)
9383 {
9384 inEffect = FALSE;
9385 }
9386
9387 return ret;
9388}
9389
9390static /*@observer@*/ cstring exprNode_rootVarName (exprNode e)
9391{
9392 cstring ret;
9393 exprData data;
9394
9395 if (exprNode_isError (e))
9396 {
9397 return cstring_undefined;
9398 }
9399
9400 data = e->edata;
9401
9402 switch (e->kind)
9403 {
9404 case XPR_PARENS:
9405 ret = exprNode_rootVarName (exprData_getUopNode (data));
9406 break;
9407 case XPR_ASSIGN:
9408 ret = exprNode_rootVarName (exprData_getOpA (data));
9409 break;
9410 case XPR_CONST:
9411 case XPR_VAR:
9412 ret = exprData_getId (data);
9413 break;
e83c79ec 9414 case XPR_INIT:
9415 ret = idDecl_getName (exprData_getInitId (data));
9416 break;
616915dd 9417 case XPR_LABEL:
9418 case XPR_TOK:
9419 case XPR_ITERCALL:
9420 case XPR_EMPTY:
9421 case XPR_CALL:
9422 case XPR_INITBLOCK:
9423 case XPR_BODY:
9424 case XPR_FETCH:
9425 case XPR_OP:
9426 case XPR_POSTOP:
9427 case XPR_PREOP:
9428 case XPR_OFFSETOF:
9429 case XPR_ALIGNOFT:
9430 case XPR_ALIGNOF:
9431 case XPR_SIZEOFT:
9432 case XPR_SIZEOF:
9433 case XPR_VAARG:
9434 case XPR_CAST:
9435 case XPR_ITER:
9436 case XPR_FOR:
9437 case XPR_FORPRED:
9438 case XPR_BREAK:
9439 case XPR_RETURN:
9440 case XPR_NULLRETURN:
9441 case XPR_COMMA:
9442 case XPR_COND:
9443 case XPR_IF:
9444 case XPR_IFELSE:
9445 case XPR_WHILE:
9446 case XPR_WHILEPRED:
9447 case XPR_DOWHILE:
9448 case XPR_GOTO:
9449 case XPR_CONTINUE:
9450 case XPR_FTDEFAULT:
9451 case XPR_DEFAULT:
9452 case XPR_SWITCH:
9453 case XPR_FTCASE:
9454 case XPR_CASE:
9455 case XPR_BLOCK:
9456 case XPR_STMT:
9457 case XPR_STMTLIST:
616915dd 9458 case XPR_FACCESS:
9459 case XPR_ARROW:
9460 case XPR_NODE:
9461 case XPR_NUMLIT:
9462 case XPR_STRINGLITERAL:
9463 ret = cstring_undefined;
9464 break;
9465 }
9466
9467 return ret;
9468}
9469
616915dd 9470static /*@only@*/ cstring exprNode_doUnparse (exprNode e)
9471{
9472 cstring ret;
9473 exprData data;
9474
9475 if (exprNode_isError (e))
9476 {
9477 static /*@only@*/ cstring error = cstring_undefined;
9478
9479 if (!cstring_isDefined (error))
9480 {
9481 error = cstring_makeLiteral ("<error>");
9482 }
9483
9484 return error;
9485 }
9486
9487 data = e->edata;
9488
9489 switch (e->kind)
9490 {
9491 case XPR_PARENS:
9492 ret = message ("(%s)", exprNode_unparse (exprData_getUopNode (e->edata)));
9493 break;
9494 case XPR_ASSIGN:
9495 ret = message ("%s %s %s",
9496 exprNode_unparse (exprData_getOpA (data)),
9497 lltok_unparse (exprData_getOpTok (data)),
9498 exprNode_unparse (exprData_getOpB (data)));
9499 break;
9500 case XPR_CALL:
9501 ret = message ("%s(%q)",
9502 exprNode_unparse (exprData_getFcn (data)),
9503 exprNodeList_unparse (exprData_getArgs (data)));
9504 break;
9505 case XPR_INITBLOCK:
9506 ret = message ("{ %q }", exprNodeList_unparse (exprData_getArgs (data)));
9507 break;
9508 case XPR_EMPTY:
9509 ret = cstring_undefined;
9510 break;
9511 case XPR_LABEL:
9512 ret = message ("%s:", exprData_getId (data));
9513 break;
9514 case XPR_CONST:
9515 case XPR_VAR:
9516 ret = cstring_copy (exprData_getId (data));
9517 break;
9518 case XPR_FETCH:
9519 ret = message ("%s[%s]", exprNode_unparse (exprData_getPairA (data)),
9520 exprNode_unparse (exprData_getPairB (data)));
9521 break;
9522 case XPR_BODY:
9523 ret = message ("<body>");
9524 break;
9525 case XPR_OP:
9526 ret = message ("%s %s %s",
9527 exprNode_unparse (exprData_getOpA (data)),
9528 lltok_unparse (exprData_getOpTok (data)),
9529 exprNode_unparse (exprData_getOpB (data)));
9530 break;
9531
9532 case XPR_PREOP:
9533 ret = message ("%s%s",
9534 lltok_unparse (exprData_getUopTok (data)),
9535 exprNode_unparse (exprData_getUopNode (data)));
9536 break;
9537
9538 case XPR_POSTOP:
9539 ret = message ("%s%s",
9540 exprNode_unparse (exprData_getUopNode (data)),
9541 lltok_unparse (exprData_getUopTok (data)));
9542 break;
9543
9544 case XPR_OFFSETOF:
9545 ret = message ("offsetof(%s,%q)",
9546 ctype_unparse (qtype_getType (exprData_getOffsetType (data))),
9547 cstringList_unparseSep (exprData_getOffsetName (data), cstring_makeLiteralTemp (".")));
9548 break;
9549
9550 case XPR_SIZEOFT:
9551 ret = message ("sizeof(%s)", ctype_unparse (qtype_getType (exprData_getType (data))));
9552 break;
9553
9554 case XPR_SIZEOF:
9555 ret = message ("sizeof(%s)", exprNode_unparse (exprData_getSingle (data)));
9556 break;
9557
9558 case XPR_ALIGNOFT:
9559 ret = message ("alignof(%s)", ctype_unparse (qtype_getType (exprData_getType (data))));
9560 break;
9561
9562 case XPR_ALIGNOF:
9563 ret = message ("alignof(%s)", exprNode_unparse (exprData_getSingle (data)));
9564 break;
9565
9566 case XPR_VAARG:
9567 ret = message ("va_arg(%s, %q)",
9568 exprNode_unparse (exprData_getCastNode (data)),
9569 qtype_unparse (exprData_getCastType (data)));
9570 break;
9571
9572 case XPR_ITERCALL:
9573 ret = message ("%q(%q)",
9574 uentry_getName (exprData_getIterCallIter (data)),
9575 exprNodeList_unparse (exprData_getIterCallArgs (data)));
9576 break;
9577 case XPR_ITER:
9578 ret = message ("%q(%q) %s %q",
9579 uentry_getName (exprData_getIterSname (data)),
9580 exprNodeList_unparse (exprData_getIterAlist (data)),
9581 exprNode_unparse (exprData_getIterBody (data)),
9582 uentry_getName (exprData_getIterEname (data)));
9583 break;
9584 case XPR_CAST:
9585 ret = message ("(%q)%s",
9586 qtype_unparse (exprData_getCastType (data)),
9587 exprNode_unparse (exprData_getCastNode (data)));
9588 break;
9589
9590 case XPR_FOR:
9591 ret = message ("%s %s",
9592 exprNode_unparse (exprData_getPairA (data)),
9593 exprNode_unparse (exprData_getPairB (data)));
9594 break;
9595
9596 case XPR_FORPRED:
9597 ret = message ("for (%s; %s; %s)",
9598 exprNode_unparse (exprData_getTripleInit (data)),
9599 exprNode_unparse (exprData_getTripleTest (data)),
9600 exprNode_unparse (exprData_getTripleInc (data)));
9601 break;
9602
9603 case XPR_GOTO:
9604 ret = message ("goto %s", exprData_getLiteral (data));
9605 break;
9606
9607 case XPR_CONTINUE:
9608 ret = cstring_makeLiteral ("continue");
9609 break;
9610
9611 case XPR_BREAK:
9612 ret = cstring_makeLiteral ("break");
9613 break;
9614
9615 case XPR_RETURN:
9616 ret = message ("return %s", exprNode_unparse (exprData_getSingle (data)));
9617 break;
9618
9619 case XPR_NULLRETURN:
9620 ret = cstring_makeLiteral ("return");
9621 break;
9622
9623 case XPR_COMMA:
9624 ret = message ("%s, %s",
9625 exprNode_unparse (exprData_getPairA (data)),
9626 exprNode_unparse (exprData_getPairB (data)));
9627 break;
9628
9629 case XPR_COND:
9630 ret = message ("%s ? %s : %s",
9631 exprNode_unparse (exprData_getTriplePred (data)),
9632 exprNode_unparse (exprData_getTripleTrue (data)),
9633 exprNode_unparse (exprData_getTripleFalse (data)));
9634 break;
9635 case XPR_IF:
9636 ret = message ("if (%s) %s",
9637 exprNode_unparse (exprData_getPairA (data)),
9638 exprNode_unparse (exprData_getPairB (data)));
9639 break;
9640
9641 case XPR_IFELSE:
9642 ret = message ("if (%s) %s else %s",
9643 exprNode_unparse (exprData_getTriplePred (data)),
9644 exprNode_unparse (exprData_getTripleTrue (data)),
9645 exprNode_unparse (exprData_getTripleFalse (data)));
9646 break;
9647 case XPR_WHILE:
9648 ret = message ("while (%s) %s",
9649 exprNode_unparse (exprData_getPairA (data)),
9650 exprNode_unparse (exprData_getPairB (data)));
9651 break;
9652
9653 case XPR_WHILEPRED:
9654 ret = cstring_copy (exprNode_unparse (exprData_getSingle (data)));
9655 break;
9656
9657 case XPR_TOK:
9658 ret = cstring_copy (lltok_unparse (exprData_getTok (data)));
9659 break;
9660
9661 case XPR_DOWHILE:
9662 ret = message ("do { %s } while (%s)",
9663 exprNode_unparse (exprData_getPairB (data)),
9664 exprNode_unparse (exprData_getPairA (data)));
9665 break;
9666
9667 case XPR_BLOCK:
abd7f895 9668 ret = message ("{ %s }", exprNode_unparse (exprData_getSingle (data)));
9669 /* evans 2002-02-20 was unparseFirst! */
616915dd 9670 break;
9671
9672 case XPR_STMT:
abd7f895 9673 ret = message ("%s;", exprNode_unparse (exprData_getUopNode (data)));
616915dd 9674 break;
9675
9676 case XPR_STMTLIST:
abd7f895 9677 if (exprNode_isStatement (exprData_getPairA (data)))
9678 {
9679 /*
9680 ** statement expressions already print the ;
9681 */
9682
9683 ret = message ("%s %s",
9684 exprNode_unparse (exprData_getPairA (data)),
9685 exprNode_unparse (exprData_getPairB (data)));
9686 }
9687 else
9688 {
9689 ret = message ("%s; %s",
9690 exprNode_unparse (exprData_getPairA (data)),
9691 exprNode_unparse (exprData_getPairB (data)));
9692 }
616915dd 9693 break;
9694
9695 case XPR_FTDEFAULT:
9696 case XPR_DEFAULT:
9697 ret = cstring_makeLiteral ("default:");
9698 break;
9699
9700 case XPR_SWITCH:
9701 ret = message ("switch (%s) %s",
9702 exprNode_unparse (exprData_getPairA (data)),
9703 exprNode_unparse (exprData_getPairB (data)));
9704 break;
9705
9706 case XPR_FTCASE:
9707 case XPR_CASE:
9708 ret = message ("case %s:",
9709 exprNode_unparse (exprData_getSingle (data)));
9710 break;
9711
9712 case XPR_INIT:
28bf4b0b 9713 if (exprNode_isError (exprData_getInitNode (data)))
9714 {
9715 ret = message ("%q", idDecl_unparseC (exprData_getInitId (data)));
9716 }
9717 else
9718 {
9719 ret = message ("%q = %s",
9720 idDecl_unparseC (exprData_getInitId (data)),
9721 exprNode_unparse (exprData_getInitNode (data)));
9722 }
616915dd 9723 break;
9724
9725 case XPR_FACCESS:
9726 ret = message ("%s.%s",
9727 exprNode_unparse (exprData_getFieldNode (data)),
9728 exprData_getFieldName (data));
9729 break;
9730
9731 case XPR_ARROW:
9732 ret = message ("%s->%s",
9733 exprNode_unparse (exprData_getFieldNode (data)),
9734 exprData_getFieldName (data));
9735 break;
9736
9737 case XPR_STRINGLITERAL:
e0b363ad 9738 if (ctype_isWideString (e->typ))
9739 {
9740 ret = message ("L\"%s\"", exprData_getLiteral (data));
9741 }
9742 else
9743 {
9744 ret = message ("\"%s\"", exprData_getLiteral (data));
9745 }
616915dd 9746 break;
9747
9748 case XPR_NUMLIT:
9749 ret = cstring_copy (exprData_getLiteral (data));
9750 break;
9751
9752 case XPR_NODE:
9753 ret = cstring_makeLiteral ("<node>");
9754 break;
9755 }
9756
9757 return ret;
9758}
9759
28bf4b0b 9760bool
9761exprNode_isInitializer (exprNode e)
9762{
9763 return (exprNode_isDefined (e)
9764 && e->kind == XPR_INIT);
9765}
9766
616915dd 9767bool
e5081f8c 9768exprNode_isCharLiteral (exprNode e)
616915dd 9769{
9770 if (exprNode_isDefined (e))
9771 {
9772 return (multiVal_isChar (exprNode_getValue (e)));
9773 }
9774 else
9775 {
9776 return FALSE;
9777 }
9778}
9779
9780bool
e5081f8c 9781exprNode_isNumLiteral (exprNode e)
616915dd 9782{
9783 if (exprNode_isDefined (e))
9784 {
9785 return (multiVal_isInt (exprNode_getValue (e)));
9786 }
9787 else
9788 {
9789 return FALSE;
9790 }
9791}
9792
9793static bool
9794exprNode_isFalseConstant (exprNode e)
9795{
9796 if (exprNode_isDefined (e))
9797 {
9798 cstring s = exprNode_rootVarName (e);
9799
9800 if (cstring_equal (s, context_getFalseName ()))
9801 {
9802 return TRUE;
9803 }
9804 }
9805
9806 return FALSE;
9807}
9808
9809bool
9810exprNode_matchLiteral (ctype expected, exprNode e)
9811{
9812 if (exprNode_isDefined (e))
9813 {
9814 multiVal m = exprNode_getValue (e);
9815
9816 if (multiVal_isDefined (m))
9817 {
9818 if (multiVal_isInt (m))
9819 {
9820 long int val = multiVal_forceInt (m);
9821
e5081f8c 9822 if (ctype_isNumAbstract (expected)
9823 && context_flagOn (FLG_NUMABSTRACTLIT, exprNode_loc (e)))
9824 {
9825 return TRUE;
9826 }
9827
616915dd 9828 if (ctype_isDirectBool (ctype_realishType (expected)))
9829 {
9830 if (val == 0)
9831 {
9832 return FALSE; /* really?! return TRUE; allow use of 0 for FALSE */
9833 }
9834 else
9835 {
9836 return FALSE;
9837 }
9838 }
9839
9840 if (ctype_isRealInt (expected))
9841 {
9842 /*
9843 ** unsigned <- [ constant >= 0 is okay ]
9844 */
9845
9846 if (ctype_isUnsigned (expected))
9847 {
9848 if (val < 0)
9849 {
9850 return FALSE;
9851 }
9852 }
9853
9854 /*
9855 ** No checks on sizes of integers...maybe add
9856 ** these later.
9857 */
9858
9859 DPRINTF (("Here: %s => %s", exprNode_unparse (e), ctype_unparse (expected)));
9860 DPRINTF (("Type: %s / %s", ctype_unparse (exprNode_getType (e)),
9861 bool_unparse (ctype_isInt (exprNode_getType (e)))));
9862
9863 if (context_getFlag (FLG_NUMLITERAL)
9864 && (ctype_isRegularInt (exprNode_getType (e)) || val == 0)) {
9865 return TRUE;
9866 } else {
9867 if (val == 0) {
9868 return TRUE;
9869 } else {
9870 return FALSE; /* evs 2000-05-17: previously, always returned TRUE */
9871 }
9872 }
9873 }
9874 else if (ctype_isChar (expected))
9875 {
9876 return FALSE;
9877 }
9878 else if (ctype_isArrayPtr (expected))
9879 {
8fe44445 9880 /*
9881 ** evans 2001-10-14: We allow 0 to match any pointer, but only if the type matches or is void *.
9882 */
9883
9884 if (val == 0)
9885 {
9886 if (ctype_match (exprNode_getType (e), expected)
9887 || ctype_isVoidPointer (exprNode_getType (e)))
9888 {
9889 return TRUE;
9890 }
9891 }
9892 else
9893 {
9894 return FALSE;
9895 }
616915dd 9896 }
9897 else if (ctype_isAnyFloat (expected))
9898 {
9899 return (context_getFlag (FLG_NUMLITERAL));
9900 }
9901 else
9902 {
9903 return FALSE;
9904 }
9905 }
9906 else if (multiVal_isDouble (m))
9907 {
9908 if (ctype_isAnyFloat (expected))
9909 {
9910 return TRUE;
9911 }
9912 }
9913 else if (multiVal_isChar (m))
9914 {
c09ebffe 9915 /*signed? */ char val = multiVal_forceChar (m);
616915dd 9916
9917 if (ctype_isChar (expected))
9918 {
c09ebffe 9919 if (ctype_isUnsigned (expected) && ((int) val) < 0)
616915dd 9920 {
9921 return FALSE;
9922 }
9923 else
9924 {
9925 return TRUE;
9926 }
9927 }
9928 }
9929 else
9930 {
9931 return FALSE;
9932 }
9933 }
9934 }
9935
9936 return FALSE;
9937}
9938
9939bool
9940exprNode_matchType (ctype expected, exprNode e)
9941{
9942 ctype actual;
9943
9944 if (!exprNode_isDefined (e)) return TRUE;
9945
9946 actual = ctype_realishType (exprNode_getType (e));
9947
9948 if (ctype_match (ctype_realishType (expected), actual))
9949 {
9950 return TRUE;
9951 }
9952
9953 llassert (!exprNode_isError (e));
9954 return (exprNode_matchLiteral (expected, e));
9955}
9956
9957static bool
9958exprNode_matchTypes (exprNode e1, exprNode e2)
9959{
9960 ctype t1;
9961 ctype t2;
9962
9963 if (!exprNode_isDefined (e1)) return TRUE;
9964 if (!exprNode_isDefined (e2)) return TRUE;
9965
9966 /*
9967 ** realish type --- keep bools, bools
9968 */
9969
9970 t1 = ctype_realishType (exprNode_getType (e1));
9971 t2 = ctype_realishType (exprNode_getType (e2));
9972
9973 if (ctype_match (t1, t2))
9974 {
9975 return TRUE;
9976 }
9977
8fe44445 9978 DPRINTF (("Matching literal! %s %s %s %s",
9979 ctype_unparse (t1), exprNode_unparse (e2),
9980 ctype_unparse (t2), exprNode_unparse (e1)));
9981
616915dd 9982 return (exprNode_matchLiteral (t1, e2) || exprNode_matchLiteral (t2, e1));
9983}
9984
9985/*
9986** pass e as ct
9987*/
9988
9989static bool
9990 exprNode_matchArgType (ctype ct, exprNode e)
9991{
9992 ctype et;
9993
9994 if (!exprNode_isDefined (e))
9995 {
9996 return TRUE;
9997 }
9998
9999 et = ctype_realType (exprNode_getType (e));
10000
10001 if (ctype_matchArg (ct, et)) return TRUE;
10002
10003 llassert (!exprNode_isError (e));
10004 return (exprNode_matchLiteral (ct, e));
10005}
10006
10007static /*@only@*/ exprNodeSList
10008 exprNode_flatten (/*@dependent@*/ exprNode e) /*@*/
10009{
10010 if (exprNode_isDefined (e))
10011 {
10012 if (e->kind == XPR_STMTLIST)
10013 {
10014 return (exprNodeSList_append
10015 (exprNode_flatten (exprData_getPairA (e->edata)),
10016 exprNode_flatten (exprData_getPairB (e->edata))));
10017 }
10018 else if (e->kind == XPR_BLOCK)
10019 {
10020 return (exprNode_flatten (exprData_getSingle (e->edata)));
10021 }
10022 else
10023 {
10024 return (exprNodeSList_singleton (e));
10025 }
10026 }
10027
10028 return exprNodeSList_new ();
10029}
10030
10031static /*@exposed@*/ exprNode
10032exprNode_lastStatement (/*@returned@*/ exprNode e)
10033{
10034 if (exprNode_isDefined (e))
10035 {
10036 if (e->kind == XPR_STMTLIST)
10037 {
10038 exprNode b = exprData_getPairB (e->edata);
10039
10040 if (exprNode_isDefined (b))
10041 {
10042 return exprNode_lastStatement (b);
10043 }
10044 else
10045 {
10046 return exprNode_lastStatement (exprData_getPairA (e->edata));
10047 }
10048 }
10049 else if (e->kind == XPR_BLOCK)
10050 {
10051 return (exprNode_lastStatement (exprData_getSingle (e->edata)));
10052 }
10053 else
10054 {
10055 return (e);
10056 }
10057 }
10058
10059 return exprNode_undefined;
10060}
10061
10062static /*@exposed@*/ exprNode
10063exprNode_firstStatement (/*@returned@*/ exprNode e)
10064{
10065 if (exprNode_isDefined (e))
10066 {
10067 if (e->kind == XPR_STMTLIST)
10068 {
10069 exprNode b = exprData_getPairA (e->edata);
10070
10071 if (exprNode_isDefined (b))
10072 {
10073 return exprNode_firstStatement (b);
10074 }
10075 else
10076 {
10077 return exprNode_firstStatement (exprData_getPairB (e->edata));
10078 }
10079 }
10080 else if (e->kind == XPR_BLOCK)
10081 {
10082 return (exprNode_firstStatement (exprData_getSingle (e->edata)));
10083 }
10084 else
10085 {
10086 return (e);
10087 }
10088 }
10089
10090 return exprNode_undefined;
10091}
10092
10093static void
10094exprNode_mergeUSs (exprNode res, exprNode other)
10095{
10096 if (exprNode_isDefined (res) && exprNode_isDefined (other))
10097 {
10098 res->msets = sRefSet_union (res->msets, other->msets);
10099 res->sets = sRefSet_union (res->sets, other->sets);
10100 res->uses = sRefSet_union (res->uses, other->uses);
10101 }
10102}
10103
10104static void
10105exprNode_mergeCondUSs (exprNode res, exprNode other1, exprNode other2)
10106{
10107 if (exprNode_isDefined (res))
10108 {
10109 if (exprNode_isDefined (other1))
10110 {
10111 res->sets = sRefSet_union (res->sets, other1->sets);
10112 res->msets = sRefSet_union (res->msets, other1->msets);
10113 res->uses = sRefSet_union (res->uses, other1->uses);
10114 }
10115 if (exprNode_isDefined (other2))
10116 {
10117 res->sets = sRefSet_union (res->sets, other2->sets);
10118 res->msets = sRefSet_union (res->msets, other2->msets);
10119 res->uses = sRefSet_union (res->uses, other2->uses);
10120 }
10121 }
10122}
10123
10124/*
10125** modifies e->uses
10126**
10127** Reports errors is s is not defined.
10128*/
10129
10130static void
28bf4b0b 10131exprNode_addUse (exprNode e, /*@exposed@*/ sRef s)
616915dd 10132{
10133 if (exprNode_isDefined (e))
10134 {
10135 e->uses = sRefSet_insert (e->uses, s);
10136 }
10137}
10138
10139void
28bf4b0b 10140exprNode_checkUse (exprNode e, /*@exposed@*/ sRef s, fileloc loc)
616915dd 10141{
10142 if (sRef_isKnown (s) && !sRef_isConst (s))
10143 {
10144 /*
10145 ** need to check all outer types are useable
10146 */
10147
10148 DPRINTF (("Check use: %s / %s",
10149 exprNode_unparse (e), sRef_unparse (s)));
28bf4b0b 10150
616915dd 10151 exprNode_addUse (e, s);
10152
10153 if (!context_inProtectVars ())
10154 {
10155 /*
10156 ** only report the deepest error
10157 */
10158
10159 sRef errorRef = sRef_undefined;
10160 sRef lastRef = sRef_undefined;
10161 bool deadRef = FALSE;
10162 bool unuseable = FALSE;
10163 bool errorMaybe = FALSE;
10164
10165 while (sRef_isValid (s) && sRef_isKnown (s))
10166 {
3e3ec469 10167 ynm readable = sRef_isValidLvalue (s);
616915dd 10168
28bf4b0b 10169 DPRINTF (("Readable: %s / %s",
10170 sRef_unparseFull (s), ynm_unparse (readable)));
10171
616915dd 10172 if (!(ynm_toBoolStrict (readable)))
10173 {
10174 if (ynm_isMaybe (readable))
10175 {
10176 lastRef = errorRef;
10177 errorRef = s;
cd7d9b17 10178 DPRINTF (("Setting ERROR: %s", sRef_unparseFull (s)));
616915dd 10179 deadRef = sRef_isPossiblyDead (errorRef);
10180 unuseable = sRef_isUnuseable (errorRef);
10181 errorMaybe = TRUE;
10182 }
10183 else
10184 {
10185 lastRef = errorRef;
10186 errorRef = s;
16c024b5 10187 DPRINTF (("Setting ERROR: %s", sRef_unparseFull (s)));
616915dd 10188 deadRef = sRef_isDead (errorRef);
10189 unuseable = sRef_isUnuseable (errorRef);
10190 errorMaybe = FALSE;
10191 }
10192
16c024b5 10193 /*
616915dd 10194 if (!sRef_isPartial (s))
10195 {
cd7d9b17 10196 DPRINTF (("Defining! %s", sRef_unparseFull (s)));
16c024b5 10197 sRef_setDefined (s, loc);
10198 DPRINTF (("Defining! %s", sRef_unparseFull (s)));
616915dd 10199 }
16c024b5 10200 */
616915dd 10201 }
10202
10203 s = sRef_getBaseSafe (s);
10204 } /* end while */
10205
10206 if (sRef_isValid (errorRef))
10207 {
10208 if (sRef_isValid (lastRef) && sRef_isField (lastRef)
10209 && sRef_isPointer (errorRef))
10210 {
10211 errorRef = lastRef;
16c024b5 10212 DPRINTF (("errorRef: %s", sRef_unparseFull (errorRef)));
616915dd 10213 }
10214
10215 if (deadRef)
10216 {
10217 if (sRef_isThroughArrayFetch (errorRef))
10218 {
10219 if (optgenerror
10220 (FLG_STRICTUSERELEASED,
10221 message ("%q %q may be used after being released",
10222 sRef_unparseKindNamePlain (errorRef),
10223 sRef_unparse (errorRef)),
10224 loc))
10225 {
10226 sRef_showRefKilled (errorRef);
10227
10228 if (sRef_isKept (errorRef))
10229 {
10230 sRef_clearAliasState (errorRef, loc);
10231 }
10232 }
10233 }
10234 else
10235 {
16c024b5 10236 DPRINTF (("HERE: %s", sRef_unparseFull (errorRef)));
616915dd 10237
10238 if (optgenerror
10239 (FLG_USERELEASED,
10240 message ("%q %q %qused after being released",
10241 sRef_unparseKindNamePlain (errorRef),
10242 sRef_unparse (errorRef),
10243 cstring_makeLiteral (errorMaybe
10244 ? "may be " : "")),
10245 loc))
10246 {
10247 sRef_showRefKilled (errorRef);
10248
10249 if (sRef_isKept (errorRef))
10250 {
10251 sRef_clearAliasState (errorRef, loc);
10252 }
10253 }
10254 }
10255 }
10256 else if (unuseable)
10257 {
10258 if (optgenerror
10259 (FLG_USEDEF,
10260 message ("%q %q%qused in inconsistent state",
10261 sRef_unparseKindName (errorRef),
10262 sRef_unparseOpt (errorRef),
10263 cstring_makeLiteral (errorMaybe ? "may be " : "")),
10264 loc))
10265 {
10266 sRef_showStateInconsistent (errorRef);
10267 }
10268 }
10269 else
10270 {
28bf4b0b 10271 DPRINTF (("HERE: %s", sRef_unparseFull (errorRef)));
616915dd 10272
16c024b5 10273 if (optgenerror
10274 (FLG_USEDEF,
10275 message ("%q %q%qused before definition",
10276 sRef_unparseKindName (errorRef),
10277 sRef_unparseOpt (errorRef),
10278 cstring_makeLiteral (errorMaybe ? "may be " : "")),
10279 loc))
10280 {
10281 ;
10282 }
cd7d9b17 10283
10284 DPRINTF (("Error: %s", sRef_unparseFull (errorRef)));
616915dd 10285 }
10286
10287 sRef_setDefined (errorRef, loc);
10288
10289 if (sRef_isAddress (errorRef))
10290 {
10291 sRef_setDefined (sRef_getRootBase (errorRef), loc);
10292 }
10293 } /* end is error */
10294 }
10295 }
10296
10297 setCodePoint ();
10298}
10299
10300static void
28bf4b0b 10301checkSafeUse (exprNode e, /*@exposed@*/ sRef s)
616915dd 10302{
10303 if (exprNode_isDefined (e) && sRef_isKnown (s))
10304 {
10305 e->uses = sRefSet_insert (e->uses, s);
10306 }
10307}
10308
10309static void
10310exprNode_checkSetAny (exprNode e, /*@dependent@*/ cstring name)
10311{
10312 if (exprNode_isDefined (e))
10313 {
10314 e->sets = sRefSet_insert (e->sets, sRef_makeUnconstrained (name));
10315 }
10316}
10317
10318void
28bf4b0b 10319exprNode_checkSet (exprNode e, /*@exposed@*/ sRef s)
616915dd 10320{
10321 sRef defines = sRef_undefined;
10322
10323 if (sRef_isValid (s) && !sRef_isNothing (s))
10324 {
10325 uentry ue = sRef_getBaseUentry (s);
10326
10327 if (uentry_isValid (ue))
10328 {
10329 uentry_setLset (ue);
10330 }
10331
10332 if (!ynm_toBoolStrict (sRef_isWriteable (s)))
10333 {
10334 voptgenerror (FLG_USEDEF,
10335 message ("Attempt to set unuseable storage: %q",
10336 sRef_unparse (s)),
10337 exprNode_loc (e));
10338 }
10339
10340 if (sRef_isMeaningful (s))
1d239d69 10341 {
616915dd 10342 if (sRef_isDead (s))
10343 {
10344 sRef base = sRef_getBaseSafe (s);
10345
10346 if (sRef_isValid (base)
10347 && sRef_isDead (base))
10348 {
10349 sRef_setPartial (s, exprNode_loc (e));
10350 }
10351
10352 defines = s; /* okay - modifies for only param */
10353 }
10354 else if (sRef_isPartial (s))
10355 {
10356 sRef eref = exprNode_getSref (e);
10357
10358 if (!sRef_isPartial (eref))
10359 {
10360 /*
10361 ** should do something different here???
10362 */
10363
10364 sRef_setDefinedComplete (eref, exprNode_loc (e));
10365 }
10366 else
10367 {
10368 sRef_setPartialDefinedComplete (eref, exprNode_loc (e));
10369 }
10370
10371 if (sRef_isMeaningful (eref))
10372 {
10373 defines = eref;
10374 }
10375 else
10376 {
10377 defines = s;
10378 }
10379 }
10380 else if (sRef_isAllocated (s))
10381 {
10382 sRef eref = exprNode_getSref (e);
10383
10384
10385 if (!sRef_isAllocated (eref))
10386 {
10387 sRef_setDefinedComplete (eref, exprNode_loc (e));
10388 }
10389 else
10390 {
10391 sRef base = sRef_getBaseSafe (eref);
10392
10393 if (sRef_isValid (base))
10394 {
10395 sRef_setPdefined (base, exprNode_loc (e));
10396 }
10397 }
10398
10399 defines = s;
10400 }
10401 else
10402 {
10403 sRef_setDefinedNCComplete (s, exprNode_loc (e));
10404 defines = s;
10405 }
10406
10407 }
10408 else /* not meaningful...but still need to insert it */
10409 {
10410 defines = s;
10411 }
10412 }
10413
10414 if (exprNode_isDefined (e) && sRef_isValid (defines))
10415 {
10416 e->sets = sRefSet_insert (e->sets, defines);
10417 }
10418}
10419
10420void
28bf4b0b 10421exprNode_checkMSet (exprNode e, /*@exposed@*/ sRef s)
616915dd 10422{
10423 if (sRef_isValid (s) && !sRef_isNothing (s))
10424 {
10425 uentry ue = sRef_getBaseUentry (s);
10426
10427 if (uentry_isValid (ue))
10428 {
10429 uentry_setLset (ue);
10430 }
10431
10432 if (!ynm_toBoolStrict (sRef_isWriteable (s)))
10433 {
10434 voptgenerror (FLG_USEDEF,
10435 message ("Attempt to set unuseable storage: %q", sRef_unparse (s)),
10436 exprNode_loc (e));
10437 }
10438
10439 if (sRef_isMeaningful (s))
10440 {
10441 sRef_setDefinedComplete (s, exprNode_loc (e));
10442 }
10443
10444 if (exprNode_isDefined (e))
10445 {
10446 e->msets = sRefSet_insert (e->msets, s);
10447 }
10448 }
10449}
10450
10451static void
10452checkUnspecCall (/*@notnull@*/ /*@dependent@*/ exprNode fcn, uentryList params, exprNodeList args)
10453{
10454 checkAnyCall (fcn, cstring_undefined, params, args,
10455 FALSE, sRefSet_undefined, FALSE, 0);
10456}
10457
10458static void
10459checkOneArg (uentry ucurrent, /*@notnull@*/ exprNode current,
10460 /*@dependent@*/ exprNode fcn, bool isSpec, int argno, int totargs)
10461{
10462 setCodePoint ();
10463
10464 if (uentry_isYield (ucurrent))
10465 {
10466 sRef_setDefined (exprNode_getSref (current), exprNode_loc (current));
10467 exprNode_checkSet (current, current->sref);
10468 }
10469 else
10470 {
10471 if (uentry_isSefParam (ucurrent))
10472 {
10473 sRefSet sets = current->sets;
10474 sRef ref = exprNode_getSref (current);
10475
10476 if (sRef_isMacroParamRef (ref))
10477 {
10478 uentry ue = sRef_getUentry (ref);
10479
10480 if (!uentry_isSefParam (ue))
10481 {
10482 voptgenerror
10483 (FLG_SEFPARAMS,
10484 message
10485 ("Parameter %d to %s is declared sef, but "
10486 "the argument is a macro parameter declared "
10487 "without sef: %s",
10488 argno, exprNode_unparse (fcn),
10489 exprNode_unparse (current)),
10490 exprNode_loc (current));
10491 }
10492 }
10493
10494 if (!sRefSet_isEmpty (sets))
10495 {
10496 sRefSet reported = sRefSet_undefined;
10497
10498 sRefSet_realElements (current->sets, el)
10499 {
10500 if (sRefSet_isSameNameMember (reported, el))
10501 {
10502 ; /* don't report again */
10503 }
10504 else
10505 {
10506 if (sRef_isUnconstrained (el))
10507 {
10508 voptgenerror
10509 (FLG_SEFUNSPEC,
10510 message
10511 ("Parameter %d to %s is declared sef, but "
10512 "the argument calls unconstrained function %s "
10513 "(no guarantee it will not modify something): %s",
10514 argno, exprNode_unparse (fcn),
10515 sRef_unconstrainedName (el),
10516 exprNode_unparse (current)),
10517 exprNode_loc (current));
10518 }
10519 else
10520 {
10521 voptgenerror
10522 (FLG_SEFPARAMS,
10523 message
10524 ("Parameter %d to %s is declared sef, but "
10525 "the argument may modify %q: %s",
10526 argno, exprNode_unparse (fcn),
10527 sRef_unparse (el),
10528 exprNode_unparse (current)),
10529 exprNode_loc (current));
10530 }
10531 }
10532 } end_sRefSet_realElements;
10533 }
10534 }
10535
2e127cb8 10536 transferChecks_passParam (current, ucurrent, isSpec, fcn, argno, totargs);
616915dd 10537 exprNode_mergeUSs (fcn, current);
10538 }
10539}
10540
10541static void
10542 checkAnyCall (/*@dependent@*/ exprNode fcn,
10543 /*@dependent@*/ cstring fname,
10544 uentryList pn,
10545 exprNodeList args,
10546 bool hasMods, sRefSet mods,
10547 bool isSpec,
10548 int specialArgs)
10549{
10550 int paramno = 0;
10551 int nargs = exprNodeList_size (args);
10552
10553 setCodePoint ();
10554
10555 /*
10556 ** concat all args ud's to f, add each arg sref as a use unless
10557 ** it was specified as "out", in which case it is a def.
10558 */
10559
10560 uentryList_reset (pn);
10561
10562 /*
10563 ** aliasing checks:
10564 **
10565 ** if paramn is only or unique, no other arg may alias argn
10566 */
10567
10568 exprNodeList_elements (args, current)
10569 {
10570 paramno++;
10571
10572 if (exprNode_isDefined (current))
10573 {
10574 if ((!uentryList_isUndefined (pn) && !uentryList_isFinished (pn)))
10575 {
10576 uentry ucurrent = uentryList_current (pn);
10577
10578 if (specialArgs == 0
10579 || (paramno < specialArgs))
10580 {
28bf4b0b 10581 checkOneArg (ucurrent, current, fcn, isSpec, paramno, nargs);
616915dd 10582
10583 if (context_maybeSet (FLG_ALIASUNIQUE))
10584 {
10585 if (uentry_isOnly (ucurrent)
10586 || uentry_isUnique (ucurrent))
10587 {
10588 checkUniqueParams (fcn, current, args,
10589 paramno, ucurrent);
10590 }
10591 }
10592 }
10593 }
10594 else /* uentry is undefined */
10595 {
10596 if (specialArgs == 0)
10597 {
10598 exprNode_checkUseParam (current);
10599 }
10600
10601 exprNode_mergeUSs (fcn, current);
10602 }
10603 }
10604 uentryList_advanceSafe (pn);
10605 } end_exprNodeList_elements;
10606
10607 if (hasMods)
10608 {
10609 setCodePoint ();
10610
10611 sRefSet_allElements (mods, s)
10612 {
10613 sRef fb;
10614 sRef rb = sRef_getRootBase (s);
10615
28bf4b0b 10616 if (sRef_isFileOrGlobalScope (rb))
616915dd 10617 {
10618 context_usedGlobal (rb);
10619 }
10620
10621 fb = sRef_fixBaseParam (s, args);
10622
10623 if (!sRef_isMacroParamRef (fb))
10624 {
10625 if (sRef_isNothing (fb))
10626 {
10627 ;
10628 }
10629 else
10630 {
10631 if (sRef_isValid (fb))
10632 {
10633 uentry ue = sRef_getBaseUentry (s);
10634
10635 if (uentry_isValid (ue))
10636 {
10637 uentry_setLset (ue);
10638 }
10639 }
10640
10641 fcn->sets = sRefSet_insert (fcn->sets, fb);
10642 }
10643 }
10644 sRef_clearDerivedComplete (s);
10645 } end_sRefSet_allElements;
10646
10647 setCodePoint ();
10648 }
10649 else
10650 {
10651 if (context_hasMods ())
10652 {
10653 if (context_maybeSet (FLG_MODUNCON))
10654 {
10655 voptgenerror
10656 (FLG_MODUNCON,
10657 message ("Undetected modification possible "
10658 "from call to unconstrained function %s: %s",
10659 fname,
10660 exprNode_unparse (fcn)),
10661 exprNode_loc (fcn));
10662 }
10663 }
10664 else
10665 {
10666 if (context_maybeSet (FLG_MODUNCONNOMODS)
10667 && !(context_inIterDef () || context_inIterEnd ()))
10668 {
10669 voptgenerror
10670 (FLG_MODUNCONNOMODS,
10671 message ("Undetected modification possible "
10672 "from call to unconstrained function %s: %s",
10673 fname,
10674 exprNode_unparse (fcn)),
10675 exprNode_loc (fcn));
10676 }
10677 }
10678
10679 exprNode_checkSetAny (fcn, fname);
10680 }
10681}
10682
10683void exprNode_checkUseParam (exprNode current)
10684{
10685 if (exprNode_isDefined (current))
10686 {
10687 exprNode_checkUse (current, current->sref, current->loc);
10688 }
10689}
10690
10691static ctype
10692 checkNumerics (ctype tr1, ctype tr2, ctype te1, ctype te2,
10693 /*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2,
10694 lltok op)
10695{
10696 ctype ret = tr1;
10697
10698 if (!ctype_match (tr1, tr2))
10699 {
10700 if ((ctype_isRealInt (tr1) || ctype_isReal (tr1)) &&
10701 (ctype_isRealInt (tr2) || ctype_isReal (tr2)))
10702 {
8fe44445 10703 DPRINTF (("No error: [%s] %s / [%s] %s",
10704 exprNode_unparse (e1), ctype_unparse (tr1),
10705 exprNode_unparse (e2), ctype_unparse (tr2)));
8ea5df88 10706
10707 /*
10708 ** evans 2003-06-15: changed this so if either type is a literal,
10709 ** the other type is used.
10710 ** (Need to look at the ISO C99 rules on this...)
10711 */
e5081f8c 10712
8ea5df88 10713 if (exprNode_isNumLiteral (e1)) {
10714 ret = tr2;
10715 } else if (exprNode_isNumLiteral (e2)) {
10716 ret = tr1;
10717 } else {
10718 ret = ctype_biggerType (tr1, tr2);
10719 }
616915dd 10720 }
10721 else
10722 {
e5081f8c 10723 if (ctype_isNumAbstract (tr1)
10724 && exprNode_isNumLiteral (e2)
10725 && context_flagOn (FLG_NUMABSTRACTLIT, e1->loc))
10726 {
10727 ret = tr1; /* No error */
10728 }
10729 else if (ctype_isNumAbstract (tr2)
10730 && exprNode_isNumLiteral (e1)
10731 && context_flagOn (FLG_NUMABSTRACTLIT, e1->loc))
10732 {
10733 ret = tr2;
10734 }
10735 else
10736 {
10737 if (gentypeerror
10738 (tr1, e1, tr2, e2,
10739 message ("Incompatible types for %s (%s, %s): %s %s %s",
10740 lltok_unparse (op),
10741 ctype_unparse (te1),
10742 ctype_unparse (te2),
10743 exprNode_unparse (e1), lltok_unparse (op),
10744 exprNode_unparse (e2)),
10745 e1->loc))
10746 {
10747 ret = ctype_unknown;
10748 }
10749 else
10750 {
10751 ret = ctype_biggerType (tr1, tr2);
10752 }
10753 }
616915dd 10754 }
616915dd 10755 }
10756 else
10757 {
e5081f8c 10758 if (ctype_isNumAbstract (tr1))
10759 {
10760 ret = tr1;
10761 }
10762 else if (ctype_isForceRealNumeric (&tr1)
10763 && ctype_isForceRealNumeric (&tr2))
616915dd 10764 {
10765 ret = ctype_resolveNumerics (tr1, tr2);
10766 }
10767 else if (!context_msgStrictOps ())
10768 {
e5081f8c 10769 if (ctype_isPointer (tr1))
616915dd 10770 {
10771 if (ctype_isPointer (tr2) && !exprNode_isNullValue (e2))
10772 {
10773 ret = ctype_int;
10774 }
10775 else if (ctype_isInt (tr2))
10776 {
10777 ret = te1;
10778 }
10779 else
10780 {
10781 ret = ctype_unknown;
10782 }
10783 }
10784 else if (ctype_isPointer (tr2))
10785 {
10786 if (ctype_isPointer (tr1))
10787 {
10788 ret = ctype_int;
10789 }
10790 else if (ctype_isInt (tr1))
10791 {
10792 ret = te2;
10793 }
10794 else
10795 {
10796 ret = ctype_unknown;
10797 }
10798 }
10799 else
10800 {
10801 ret = ctype_resolveNumerics (tr1, tr2);
10802 }
10803 }
10804 else
10805 {
10806 int opid = lltok_getTok (op);
10807 bool comparop = (opid == EQ_OP || opid == NE_OP
10808 || opid == TLT || opid == TGT
10809 || opid == LE_OP || opid == GE_OP);
10810
10811 if (!ctype_isNumeric (tr1) && !ctype_isNumeric (tr2))
10812 {
10813 if (comparop
10814 && ((ctype_isEnum (tr1) && ctype_isEnum (tr2))
10815 || (ctype_isBool (tr1) && ctype_isBool (tr2))
10816 || (ctype_isChar (tr1) && ctype_isChar (tr2))))
10817 {
10818 ; /* no error */
10819 }
10820 else
10821 {
10822 if (ctype_sameName (te1, te2))
10823 {
10824 voptgenerror
10825 (FLG_STRICTOPS,
10826 message ("Operands of %s are non-numeric (%t): %s %s %s",
10827 lltok_unparse (op), te1,
10828 exprNode_unparse (e1), lltok_unparse (op),
10829 exprNode_unparse (e2)),
10830 e1->loc);
10831 }
10832 else
10833 {
10834 voptgenerror
10835 (FLG_STRICTOPS,
10836 message ("Operands of %s are non-numerics (%t, %t): %s %s %s",
10837 lltok_unparse (op), te1, te2,
10838 exprNode_unparse (e1), lltok_unparse (op),
10839 exprNode_unparse (e2)),
10840 e1->loc);
10841 }
10842 }
10843 }
10844 else if (!ctype_isNumeric (tr1))
10845 {
10846 voptgenerror
10847 (FLG_STRICTOPS,
10848 message ("Right operand of %s is non-numeric (%t): %s %s %s",
10849 lltok_unparse (op), te1,
10850 exprNode_unparse (e1), lltok_unparse (op),
10851 exprNode_unparse (e2)),
10852 e1->loc);
10853 }
10854 else
10855 {
10856 if (!ctype_isNumeric (tr2))
10857 {
10858 voptgenerror
10859 (FLG_STRICTOPS,
10860 message ("Left operand of %s is non-numeric (%t): %s %s %s",
10861 lltok_unparse (op), te2,
10862 exprNode_unparse (e1), lltok_unparse (op),
10863 exprNode_unparse (e2)),
10864 e2->loc);
10865 }
10866 }
10867
10868 ret = ctype_unknown;
10869 }
10870 }
10871
10872 return ret;
10873}
10874
e5081f8c 10875static bool
616915dd 10876abstractOpError (ctype tr1, ctype tr2, lltok op,
10877 /*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2,
10878 fileloc loc1, fileloc loc2)
10879{
10880 if (ctype_isRealAbstract (tr1) && ctype_isRealAbstract (tr2))
10881 {
10882 if (ctype_match (tr1, tr2))
10883 {
e5081f8c 10884 if (ctype_isRealNumAbstract (tr1))
10885 {
10886 ; /* No warning for numabstract types */
10887 }
10888 else
10889 {
16c024b5 10890 if (lltok_isEqOp (op) || lltok_isNotEqOp (op))
10891 {
10892 return optgenerror
10893 (FLG_ABSTRACTCOMPARE,
10894 message ("Object equality comparison (%s) on objects of abstract type (%t): %s %s %s",
10895 lltok_unparse (op), tr1,
10896 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
10897 loc1);
10898 }
10899 else
10900 {
10901 return optgenerror
10902 (FLG_ABSTRACT,
10903 message ("Operands of %s are abstract type (%t): %s %s %s",
10904 lltok_unparse (op), tr1,
10905 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
10906 loc1);
10907 }
e5081f8c 10908 }
616915dd 10909 }
10910 else
10911 {
e5081f8c 10912 if (ctype_isRealNumAbstract (tr1) && ctype_isRealNumAbstract (tr2))
10913 {
10914 return optgenerror
10915 (FLG_NUMABSTRACT,
10916 message
10917 ("Operands of %s are different numabstract types (%t, %t): %s %s %s",
10918 lltok_unparse (op), tr1, tr2,
10919 exprNode_unparse (e1),
10920 lltok_unparse (op), exprNode_unparse (e2)),
10921 loc1);
10922 }
10923 else
10924 {
10925 return optgenerror
10926 (FLG_ABSTRACT,
10927 message ("Operands of %s are abstract types (%t, %t): %s %s %s",
10928 lltok_unparse (op), tr1, tr2,
10929 exprNode_unparse (e1), lltok_unparse (op),
10930 exprNode_unparse (e2)),
10931 loc1);
10932 }
616915dd 10933 }
10934 }
e5081f8c 10935 else if (ctype_isRealAbstract (tr1) && !ctype_isRealNumAbstract (tr1))
616915dd 10936 {
e5081f8c 10937 return optgenerror
616915dd 10938 (FLG_ABSTRACT,
10939 message ("Left operand of %s is abstract type (%t): %s %s %s",
10940 lltok_unparse (op), tr1,
10941 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
10942 loc1);
10943 }
10944 else
10945 {
e5081f8c 10946 if (ctype_isRealAbstract (tr2) && !ctype_isRealNumAbstract (tr2))
616915dd 10947 {
e5081f8c 10948 return optgenerror
616915dd 10949 (FLG_ABSTRACT,
10950 message ("Right operand of %s is abstract type (%t): %s %s %s",
10951 lltok_unparse (op), tr2,
10952 exprNode_unparse (e1), lltok_unparse (op), exprNode_unparse (e2)),
10953 loc2);
10954 }
10955 }
e5081f8c 10956
10957 return FALSE;
616915dd 10958}
10959
10960/*
10961** e1 <= e2
10962**
10963** requies e1 and e2 and not error exprNode's.
10964**
10965** Checks:
10966**
10967** If e1 is a component of an abstract type, and e2 is mutable and client-visible,
10968** the rep of the abstract type is exposed.
10969**
10970** The order is very important:
10971**
10972** check rep expose (move into check transfer)
10973** check transfer
10974** setup aliases
10975*/
10976
10977/*
10978** This isn't really a sensible procedure, but the indententation
10979** was getting too deep.
10980*/
10981
10982static void
10983checkOneRepExpose (sRef ysr, sRef base,
10984 /*@notnull@*/ exprNode e1,
10985 /*@notnull@*/ exprNode e2, ctype ct,
10986 sRef s2b)
10987{
10988 if (!(sRef_isOnly (ysr) || sRef_isKeep (ysr)
08eb3d0e 10989 || sRef_isOwned (ysr)
10990 || sRef_isExposed (ysr)))
616915dd 10991 {
08eb3d0e 10992 if (sRef_isAnyParam (base) && !sRef_isExposed (base)
10993 && !sRef_isObserver (base)) /* evans 2001-07-11: added isObserver */
10994
616915dd 10995 {
10996 if (sRef_isIReference (ysr))
10997 {
10998 if (sRef_sameName (base, sRef_getRootBase (e2->sref)))
10999 {
11000 voptgenerror
11001 (FLG_ASSIGNEXPOSE,
11002 message
11003 ("Assignment of mutable component of parameter %q "
11004 "to component of abstract "
11005 "type %s exposes rep: %s = %s",
11006 sRef_unparse (base),
11007 ctype_unparse (ct),
11008 exprNode_unparse (e1), exprNode_unparse (e2)),
11009 e1->loc);
11010 }
11011 else
11012 {
11013 voptgenerror
11014 (FLG_ASSIGNEXPOSE,
11015 message
11016 ("Assignment of mutable component of parameter %q "
11017 "(through alias %q) to component of abstract "
11018 "type %s exposes rep: %s = %s",
11019 sRef_unparse (base),
11020 sRef_unparse (e2->sref),
11021 ctype_unparse (ct),
11022 exprNode_unparse (e1), exprNode_unparse (e2)),
11023 e1->loc);
11024 }
11025 }
11026 else
11027 {
11028 if (sRef_sameName (base, sRef_getRootBase (e2->sref)))
11029 {
11030 voptgenerror
11031 (FLG_ASSIGNEXPOSE,
11032 message ("Assignment of mutable parameter %q "
11033 "to component of abstract type %s "
11034 "exposes rep: %s = %s",
11035 sRef_unparse (base),
11036 ctype_unparse (ct),
11037 exprNode_unparse (e1),
11038 exprNode_unparse (e2)),
11039 e1->loc);
11040 }
11041 else
11042 {
11043 voptgenerror
11044 (FLG_ASSIGNEXPOSE,
11045 message ("Assignment of mutable parameter %q "
11046 "(through alias %q) to "
11047 "component of abstract type %s exposes "
11048 "rep: %s = %s",
11049 sRef_unparse (base),
11050 sRef_unparse (e2->sref),
11051 ctype_unparse (ct),
11052 exprNode_unparse (e1),
11053 exprNode_unparse (e2)),
11054 e1->loc);
11055 }
11056 }
11057 }
11058
28bf4b0b 11059 if (sRef_isFileOrGlobalScope (s2b))
616915dd 11060 {
11061 if (sRef_sameName (base, sRef_getRootBase (e2->sref)))
11062 {
11063 voptgenerror
11064 (FLG_REPEXPOSE,
11065 message ("Assignment of global %q "
11066 "to component of "
11067 "abstract type %s exposes rep: %s = %s",
11068 sRef_unparse (base),
11069 ctype_unparse (ct),
11070 exprNode_unparse (e1), exprNode_unparse (e2)),
11071 e1->loc);
11072 }
11073 else
11074 {
11075 voptgenerror
11076 (FLG_REPEXPOSE,
11077 message ("Assignment of global %q (through alias %q) "
11078 "to component of "
11079 "abstract type %s exposes rep: %s = %s",
11080 sRef_unparse (base),
11081 sRef_unparse (e2->sref),
11082 ctype_unparse (ct),
11083 exprNode_unparse (e1), exprNode_unparse (e2)),
11084 e1->loc);
11085 }
11086 }
11087 }
11088}
11089
11090static void
11091doAssign (/*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2, bool isInit)
11092{
7534721d 11093 DPRINTF (("Do assign: %s <- %s",
11094 exprNode_unparse (e1), exprNode_unparse (e2)));
11095 DPRINTF (("Ctype: %s", ctype_unparse (exprNode_getType (e1))));
11096
616915dd 11097 if (ctype_isRealFunction (exprNode_getType (e1))
11098 && !ctype_isRealPointer (exprNode_getType (e1)))
11099 {
11100 voptgenerror
11101 (FLG_TYPE,
11102 message ("Invalid left-hand side of assignment (function type %s): %s",
11103 ctype_unparse (exprNode_getType (e1)),
11104 exprNode_unparse (e1)),
11105 e1->loc);
11106 }
11107
11108 if (context_getFlag (FLG_ASSIGNEXPOSE) && ctype_isMutable (e2->typ))
11109 {
11110 ctype t2 = exprNode_getType (e2);
11111 sRef sr = sRef_getRootBase (e1->sref);
11112 ctype ct = sRef_getType (sr);
11113
11114 if (ctype_isAbstract (t2)
b73d1009 11115 && !ctype_isNumAbstract (t2)
616915dd 11116 && !(uentry_isMutableDatatype (usymtab_getTypeEntry (ctype_typeId (t2)))))
11117 {
11118 /* it is immutable, okay to reference */
11119 goto donerepexpose;
11120 }
11121
11122 if (ctype_isAbstract (ct) && sRef_isIReference (e1->sref))
11123 {
11124 sRef s2b = sRef_getRootBase (e2->sref);
11125 sRef s1 = e1->sref;
11126 sRef s1b = sRef_getRootBase (s1);
11127 sRefSet aliases;
11128
11129 aliases = usymtab_canAlias (e2->sref);
11130
11131 if (!sRef_similar (s2b, s1b)
11132 && !sRef_isExposed (s1)
11133 && !(sRef_isOnly (s2b) || sRef_isKeep (s2b) || sRef_isExposed (s2b)))
11134 {
11135 if (sRef_isAnyParam (s2b) && !sRef_isOnly (s2b)
11136 && !sRef_isOwned (s2b) && !sRef_isKeep (s2b)
11137 && !sRef_isExposed (s2b))
11138 {
11139 if (sRef_isIReference (e2->sref))
11140 {
11141 voptgenerror
11142 (FLG_ASSIGNEXPOSE,
11143 message
11144 ("Assignment of mutable component of parameter %q "
11145 "to component of abstract type %s exposes rep: %s = %s",
11146 sRef_unparse (s2b),
11147 ctype_unparse (ct),
11148 exprNode_unparse (e1), exprNode_unparse (e2)),
11149 e1->loc);
11150 }
11151 else
11152 {
11153 voptgenerror
11154 (FLG_ASSIGNEXPOSE,
11155 message ("Assignment of mutable parameter %q to "
11156 "component of abstract type %s exposes rep: %s = %s",
11157 sRef_unparse (s2b),
11158 ctype_unparse (ct),
11159 exprNode_unparse (e1), exprNode_unparse (e2)),
11160 e1->loc);
11161 }
11162 }
11163
28bf4b0b 11164 if (sRef_isFileOrGlobalScope (s2b))
616915dd 11165 {
11166 voptgenerror
11167 (FLG_ASSIGNEXPOSE,
11168 message ("Assignment of global %q to component of "
11169 "abstract type %s exposes rep: %s = %s",
11170 sRef_unparse (s2b),
11171 ctype_unparse (ct),
11172 exprNode_unparse (e1), exprNode_unparse (e2)),
11173 e1->loc);
11174 }
11175
11176 sRefSet_realElements (aliases, ysr)
11177 {
11178 sRef base = sRef_getRootBase (ysr);
11179
11180 if (sRef_similar (ysr, s2b) || sRef_similar (s1b, base)
11181 || sRef_sameName (base, s1b))
11182 {
11183 ; /* error already reported or same sref */
11184 }
11185 else
11186 {
11187 checkOneRepExpose (ysr, base, e1, e2, ct, s2b);
11188 }
11189 } end_sRefSet_realElements;
11190 }
11191 sRefSet_free (aliases);
11192 }
11193 }
11194
11195 donerepexpose:
11196
11197 /*
11198 ** function variables don't really work...
11199 */
11200
11201 if (!ctype_isFunction (ctype_realType (e2->typ)))
11202 {
11203 if (isInit)
11204 {
28bf4b0b 11205 DPRINTF (("Check init: %s / %s",
11206 exprNode_unparse (e1), exprNode_unparse (e2)));
2e127cb8 11207 transferChecks_initialization (e1, e2);
616915dd 11208 }
11209 else
11210 {
2e127cb8 11211 transferChecks_assign (e1, e2);
616915dd 11212 }
11213 }
11214 else
11215 {
11216 sRef fref = e2->sref;
11217
11218 sRef_setDefState (e1->sref, sRef_getDefState (fref), e1->loc);
11219 sRef_setNullState (e1->sref, sRef_getNullState (fref), e1->loc);
11220
11221 /* Need to typecheck the annotation on the parameters */
11222
11223 if (ctype_isRealFunction (e1->typ)) {
11224 uentryList e1p = ctype_argsFunction (ctype_realType (e1->typ));
11225 uentryList e2p = ctype_argsFunction (ctype_realType (e2->typ));
11226
11227 if (!uentryList_isMissingParams (e1p)
11228 && !uentryList_isMissingParams (e2p)
11229 && uentryList_size (e1p) > 0) {
11230 if (uentryList_size (e1p) == uentryList_size (e2p)) {
11231 int n = 0;
11232
11233 uentryList_elements (e1p, el1) {
11234 uentry el2;
11235
11236 el2 = uentryList_getN (e2p, n);
11237 n++;
11238 uentry_checkMatchParam (el1, el2, n, e2);
11239 } end_uentryList_elements;
11240 }
11241 }
11242 }
11243 }
11244
7534721d 11245 if (exprNode_isStringLiteral (e2))
11246 {
11247 exprNode_checkStringLiteralLength (exprNode_getType (e1), e2);
11248 }
11249
28bf4b0b 11250 if (isInit && sRef_isFileOrGlobalScope (e1->sref))
616915dd 11251 {
11252 ;
11253 }
11254 else
11255 {
28bf4b0b 11256 DPRINTF (("Update aliases: %s / %s", exprNode_unparse (e1), exprNode_unparse (e2)));
616915dd 11257 updateAliases (e1, e2);
11258 }
616915dd 11259}
11260
11261static void
11262checkMacroParen (exprNode e)
11263{
11264 if (exprNode_isError (e) || e->kind == XPR_CAST)
11265 {
11266 ;
11267 }
11268 else
11269 {
11270 if (sRef_isUnsafe (e->sref) && !exprNode_isInParens (e))
11271 {
11272 voptgenerror
11273 (FLG_MACROPARENS,
11274 message ("Macro parameter used without parentheses: %s",
11275 exprNode_unparse (e)),
11276 e->loc);
11277 }
11278 }
11279}
11280
11281static void
11282reflectNullTest (/*@notnull@*/ exprNode e, bool isnull)
11283{
11284 if (isnull)
11285 {
11286 e->guards = guardSet_addTrueGuard (e->guards, e->sref);
11287 }
11288 else
11289 {
11290 e->guards = guardSet_addFalseGuard (e->guards, e->sref);
11291 }
11292}
11293
11294/*
11295** e1 <= e2
11296**
11297** if e2 is a parameter or global derived location which
11298** can be modified (that is, e2 is a mutable abstract type,
11299** or a derived pointer), then e1 can alias e2.
11300**
11301** e1 can alias everything which e2 can alias.
11302**
11303** Also, if e1 is guarded, remove from guard sets!
11304*/
11305
11306static void updateAliases (/*@notnull@*/ exprNode e1, /*@notnull@*/ exprNode e2)
11307{
11308 if (!context_inProtectVars ())
11309 {
11310 /*
11311 ** depends on types of e1 and e2
11312 */
11313
11314 sRef s1 = e1->sref;
11315 sRef s2 = e2->sref;
11316 ctype t1 = exprNode_getType (e1);
11317
11318 /* handle pointer sRefs, record fields, arrays, etc... */
11319
11320 if (!ctype_isRealSU (t1))
11321 {
28bf4b0b 11322 DPRINTF (("Copying real! %s", ctype_unparse (t1)));
616915dd 11323 sRef_copyRealDerivedComplete (s1, s2);
11324 }
28bf4b0b 11325 else
11326 {
11327 /*
11328 ** Fields should alias
11329 */
11330
11331 DPRINTF (("Not COPYING!: %s", ctype_unparse (t1)));
11332 }
616915dd 11333
11334 if (ctype_isMutable (t1) && sRef_isKnown (s1))
11335 {
11336 usymtab_clearAlias (s1);
11337 usymtab_addMustAlias (s1, s2);
28bf4b0b 11338 DPRINTF (("Add must alias: %s / %s", sRef_unparse (s1), sRef_unparse (s2)));
11339 }
11340 else
11341 {
11342 DPRINTF (("Not mutable: %s", ctype_unparse (t1)));
616915dd 11343 }
11344
11345 if (sRef_possiblyNull (s1) && usymtab_isGuarded (s1))
11346 {
11347 usymtab_unguard (s1);
11348 }
11349 }
11350}
11351
11352exprNode exprNode_updateLocation (/*@returned@*/ exprNode e, /*@temp@*/ fileloc loc)
11353{
11354 if (exprNode_isDefined (e))
11355 {
11356 e->loc = fileloc_update (e->loc, loc);
11357 }
11358 else
11359 {
11360 e = exprNode_createLoc (ctype_unknown, fileloc_copy (loc));
11361 }
11362
11363 return (e);
11364}
11365
11366static void checkUniqueParams (exprNode fcn,
11367 /*@notnull@*/ exprNode current,
11368 exprNodeList args,
11369 int paramno, uentry ucurrent)
11370{
11371 int iparamno = 0;
11372 sRef thisref = exprNode_getSref (current);
11373
11374 /*
11375 ** Check if any argument could match this argument.
11376 */
11377
11378 exprNodeList_elements (args, icurrent)
11379 {
11380 iparamno++;
11381
11382 if (iparamno != paramno)
11383 {
11384 sRef sr = exprNode_getSref (icurrent);
11385
11386 if (sRef_similarRelaxed (thisref, sr))
11387 {
11388 if (!sRef_isConst (thisref) && !sRef_isConst (sr))
11389 {
11390 voptgenerror
11391 (FLG_ALIASUNIQUE,
11392 message
11393 ("Parameter %d (%s) to function %s is declared %s but "
11394 "is aliased by parameter %d (%s)",
11395 paramno,
11396 exprNode_unparse (current),
11397 exprNode_unparse (fcn),
11398 alkind_unparse (uentry_getAliasKind (ucurrent)),
11399 iparamno, exprNode_unparse (icurrent)),
11400 current->loc);
11401 }
11402 }
11403 else
11404 {
11405 sRefSet aliases = usymtab_canAlias (sr);
11406
11407 sRefSet_allElements (aliases, asr)
11408 {
11409 if (ctype_isUnknown (sRef_getType (thisref)))
11410 {
11411 sRef_setType (thisref, uentry_getType (ucurrent));
11412 }
11413
11414 if (sRef_similarRelaxed (thisref, asr))
11415 {
11416 if (sRef_isExternal (asr))
11417 {
11418 if (sRef_isLocalState (thisref))
11419 {
11420 ; /* okay */
11421 }
11422 else
11423 {
11424 sRef base = sRef_getRootBase (asr);
11425
11426 if (!sRef_similar (sRef_getBase (asr), thisref))
11427 {
11428 if (sRef_isUnique (base) || sRef_isOnly (base)
11429 || sRef_isKept (base)
11430 || (sRef_isAddress (asr) && sRef_isLocalVar (base))
11431 || (sRef_isAddress (thisref)
11432 && sRef_isLocalVar (sRef_getRootBase (thisref))))
11433 {
11434 ; /* okay, no error */
11435 }
11436 else
11437 {
11438 voptgenerror
11439 (FLG_MAYALIASUNIQUE,
11440 message
11441 ("Parameter %d (%s) to function %s is declared %s but "
11442 "may be aliased externally by parameter %d (%s)",
11443 paramno,
11444 exprNode_unparse (current),
11445 exprNode_unparse (fcn),
11446 alkind_unparse (uentry_getAliasKind (ucurrent)),
11447 iparamno, exprNode_unparse (icurrent)),
11448 current->loc);
11449 }
11450 }
11451 }
11452 }
11453 else
11454 {
11455 voptgenerror
11456 (FLG_ALIASUNIQUE,
11457 message
11458 ("Parameter %d (%s) to function %s is declared %s but "
11459 "is aliased externally by parameter %d (%s) through "
11460 "alias %q",
11461 paramno,
11462 exprNode_unparse (current),
11463 exprNode_unparse (fcn),
11464 alkind_unparse (uentry_getAliasKind (ucurrent)),
11465 iparamno, exprNode_unparse (icurrent),
11466 sRef_unparse (asr)),
11467 current->loc);
11468 }
11469 }
11470 } end_sRefSet_allElements;
11471 sRefSet_free (aliases);
11472 }
11473 }
11474 } end_exprNodeList_elements;
11475}
11476
517a2db3 11477long exprNode_getLongValue (exprNode e)
11478{
616915dd 11479 long value;
517a2db3 11480
11481 if (exprNode_hasValue (e) && multiVal_isInt (exprNode_getValue (e)))
616915dd 11482 {
11483 value = multiVal_forceInt (exprNode_getValue (e));
11484 }
11485 else
11486 {
517a2db3 11487 value = 0; /* Unknown value */
616915dd 11488 }
11489
11490 return value;
11491}
11492
bb25bea6 11493/*@only@*/ fileloc exprNode_getNextSequencePoint (exprNode e)
616915dd 11494{
11495 /*
11496 ** Returns the location of the sequence point following e.
11497 **
11498 ** Only works for statements (for now).
11499 */
11500
11501 if (exprNode_isDefined (e) && e->kind == XPR_STMT) {
11502 lltok t = exprData_getUopTok (e->edata);
bb25bea6 11503 return fileloc_copy(lltok_getLoc (t));
616915dd 11504 } else {
b7b694d6 11505 /* drl possible problem : warning fix
11506 llcontbug (message ("Cannot get next sequence point: %s", exprNode_unparse (e)));
11507 */
616915dd 11508 return fileloc_undefined;
11509 }
11510 }
11511
9280addf 11512exprNode exprNode_createNew(ctype c)
11513{
11514 exprNode ret;
11515
11516 ret = exprNode_createPlain (c);
11517
11518 return ret;
11519}
d30bc0c7 11520
11521bool exprNode_isInitBlock (exprNode e)
11522{
11523 return (exprNode_isDefined(e) && e->kind == XPR_INITBLOCK);
11524}
72704d73 11525
11526/*drl 3/2/2003 moved this function out of constraint.c */
11527exprNode exprNode_copyConstraints (/*@returned@*/ exprNode dst, exprNode src)
11528{
11529
11530 llassert (exprNode_isDefined (dst) );
11531 llassert (exprNode_isDefined (src) );
11532
11533 constraintList_free (dst->ensuresConstraints);
11534 constraintList_free (dst->requiresConstraints);
11535 constraintList_free (dst->trueEnsuresConstraints);
11536 constraintList_free (dst->falseEnsuresConstraints);
11537
11538 dst->ensuresConstraints = constraintList_copy (src->ensuresConstraints);
11539 dst->requiresConstraints = constraintList_copy (src->requiresConstraints);
11540 dst->trueEnsuresConstraints = constraintList_copy (src->trueEnsuresConstraints);
11541 dst->falseEnsuresConstraints = constraintList_copy (src->falseEnsuresConstraints);
11542 return dst;
11543}
909cf5eb 11544
11545void exprNode_revealState (exprNode e)
11546{
11547 if (exprNode_isDefined (e)) {
11548 llmsg (message ("%s: State of %s: %s", fileloc_unparse (exprNode_loc (e)),
11549 exprNode_unparse (e), sRef_unparseFull (e->sref)));
11550 } else {
11551 llmsg (message ("%s: Reveal state undefined", fileloc_unparse (g_currentloc)));
11552 }
11553}
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