2 ** LCLint - annotation-assisted static program checker
3 ** Copyright (C) 1994-2000 University of Virginia,
4 ** Massachusetts Institute of Technology
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.
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.
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.
20 ** For information on lclint: lclint-request@cs.virginia.edu
21 ** To report a bug: lclint-bug@cs.virginia.edu
22 ** For more information: http://lclint.cs.virginia.edu
28 # include "lclintMacros.nf"
30 # include "cgrammar.h"
31 # include "cgrammar_tokens.h"
32 # include "aliasChecks.h"
33 # include "exprChecks.h"
36 ** for now, allow exprChecks to access exprNode.
37 ** may remove this in future
42 static bool checkCallModifyAux (sRef p_s, exprNode p_f, sRef p_alias, exprNode p_err);
43 static bool checkModifyValAux (sRef p_s, exprNode p_f, sRef p_alias, exprNode p_err);
44 static bool checkModifyAux (sRef p_s, exprNode p_f, sRef p_alias, exprNode p_err);
45 static void checkSafeReturnExpr (/*@notnull@*/ exprNode p_e);
48 ** called at end of expression statement
50 ** of e->kind is not an assign, empty, body or modop
51 ** verify the the value is void
56 exprNode_checkStatement (exprNode e)
58 bool hasError = FALSE;
60 if (!exprNode_isError (e))
62 exprKind ek = e->kind;
64 if (ek == XPR_CALL && !(ctype_isRealVoid (e->typ)))
66 if (ctype_isKnown (e->typ))
68 if (ctype_isManifestBool (ctype_realishType (e->typ)))
70 hasError = optgenerror
72 message ("Return value (type %t) ignored: %s",
74 exprNode_unparseFirst (e)),
77 else if (ctype_isDirectInt (e->typ))
79 hasError = optgenerror
81 message ("Return value (type %t) ignored: %s",
83 exprNode_unparseFirst (e)),
88 hasError = optgenerror
90 message ("Return value (type %t) ignored: %s",
92 exprNode_unparseFirst (e)),
98 if (!hasError && !(exprNode_mayEscape (e))
99 && !(e->canBreak)) /* control changes are effects too! */
101 if (sRefSet_hasRealElement (e->sets)
102 || sRefSet_hasRealElement (e->msets))
108 if (sRefSet_isEmpty (e->sets) && sRefSet_isEmpty (e->msets))
112 message ("Statement has no effect: %s",
113 exprNode_unparseFirst (e)),
118 if (context_maybeSet (FLG_NOEFFECTUNCON))
120 if (sRefSet_hasUnconstrained (e->sets))
124 message ("Statement has no effect (possible "
125 "undected modification through "
127 sRefSet_unparseUnconstrained (e->sets),
128 exprNode_unparseFirst (e)),
131 else if (sRefSet_hasUnconstrained (e->msets))
135 message ("Statement has no effect (possible "
136 "undected modification through "
138 sRefSet_unparseUnconstrained (e->msets),
139 exprNode_unparseFirst (e)),
144 ; /* statement has unknown modification */
154 checkRepExposed (sRef base, /*@notnull@*/ exprNode e, sRef alias,
155 /*@unused@*/ exprNode unused)
159 if (sRef_isInvalid (alias) || sRef_sameName (base, alias))
161 btype = sRef_getType (base);
163 if (ctype_isAbstract (btype) && ctype_isVisiblySharable (e->typ))
165 voptgenerror (FLG_RETEXPOSE,
166 message ("Return value exposes rep of %s: %s",
167 ctype_unparse (btype),
168 exprNode_unparse (e)),
175 sRef rbase = sRef_getRootBase (base);
176 btype = sRef_getType (rbase);
178 if (ctype_isAbstract (btype) && ctype_isVisiblySharable (e->typ))
182 message ("Return value may expose rep of %s through alias %q: %s",
183 ctype_unparse (btype),
184 sRef_unparse (rbase),
185 exprNode_unparse (e)),
195 checkRefGlobParam (sRef base, /*@notnull@*/ exprNode e,
196 sRef alias, /*@unused@*/ exprNode unused)
198 if (sRef_isInvalid (alias) || sRef_sameName (base, alias))
202 if (ctype_isUnknown (ct))
204 ct = sRef_getType (base);
207 if (ctype_isVisiblySharable (ct))
209 if (sRef_isGlobal (base))
213 message ("Function returns reference to global %q: %s",
215 exprNode_unparse (e)),
220 else if (sRef_isAnyParam (base))
222 uentryList params = context_getParams ();
223 int paramno = sRef_getParam (base);
225 if (paramno < uentryList_size (params))
227 uentry arg = uentryList_getN (params, paramno);
228 sRef ref = uentry_getSref (arg);
230 if (uentry_isReturned (arg)
232 || sRef_isExposed (ref)
233 || sRef_isRefCounted (ref))
241 message ("Function returns reference to parameter %q: %s",
243 exprNode_unparse (e)),
249 llbuglit ("ret alias: bad paramno");
262 if (ctype_isVisiblySharable (e->typ))
264 if (sRef_isGlobal (base))
268 message ("Function may return reference to global %q through alias %q: %s",
269 sRef_unparse (alias),
271 exprNode_unparse (e)),
275 else if (sRef_isAnyParam (base) && !(sRef_isOnly (base)))
277 uentryList params = context_getParams ();
278 int paramno = sRef_getParam (base);
280 if (paramno < uentryList_size (params))
282 uentry arg = uentryList_getN (params, paramno);
284 if (!uentry_isReturned (arg))
289 ("Function may return reference to parameter %q through alias %q: %s",
291 sRef_unparse (alias),
292 exprNode_unparse (e)),
303 ("Function may return reference to parameter %q through alias %q: %s",
305 sRef_unparse (alias),
306 exprNode_unparse (e)),
323 exprNode_checkModify (exprNode e, exprNode err)
325 llassert (exprNode_isDefined (e));
327 DPRINTF (("Check modify: %s", exprNode_unparse (e)));
329 if (sRef_isValid (e->sref))
331 sRef_aliasCheckPred (checkModifyAux, sRef_isReference, e->sref, e, err);
336 exprNode_checkModifyVal (exprNode e, exprNode err)
338 llassert (exprNode_isDefined (e));
340 DPRINTF (("Check modify val: %s", exprNode_unparse (e)));
342 if (sRef_isValid (e->sref))
344 sRef_aliasCheckPred (checkModifyValAux, sRef_isReference, e->sref, e, err);
349 exprChecks_checkNullReturn (fileloc loc)
351 if (!context_inRealFunction ())
354 llmsg ("exprChecks_checkNullReturnExpr: not in function context");
360 if (ctype_isFunction (context_currentFunctionType ()))
362 ctype tr = ctype_returnValue (context_currentFunctionType ());
364 if (!ctype_isFirstVoid (tr))
366 if (ctype_isUnknown (tr))
370 cstring_makeLiteral ("Empty return in function declared to implicitly return int"),
375 voptgenerror (FLG_CONTROL,
376 message ("Empty return in function declared to return %t", tr),
385 exprNode_checkReturn (exprNode e)
387 if (!exprNode_isError (e))
389 if (!context_inRealFunction ())
391 if (context_inMacro ())
393 llerror (FLG_CONTROL,
394 message ("Macro %s uses return (not functional)",
395 context_inFunctionName ()));
400 llbuglit ("exprNode_checkReturn: not in function context");
406 if (ctype_isFunction (context_currentFunctionType ()))
408 checkSafeReturnExpr (e);
419 exprNode_checkPred (cstring c, exprNode e)
423 if (exprNode_isError (e))
426 ct = exprNode_getType (e);
428 if (exprNode_isAssign (e))
432 message ("Test expression for %s is assignment expression: %s",
433 c, exprNode_unparse (e)),
437 if (ctype_isRealBool (ct))
441 else if (ctype_isRealPointer (ct))
445 message ("Test expression for %s not %s, type %t: %s", c,
446 context_printBoolName (),
447 ct, exprNode_unparse (e)),
450 else if (ctype_isRealInt (ct))
454 message ("Test expression for %s not %s, type %t: %s", c,
455 context_printBoolName (), ct, exprNode_unparse (e)),
462 message ("Test expression for %s not %s, type %t: %s", c,
463 context_printBoolName (), ct, exprNode_unparse (e)),
469 exprChecks_checkUsedGlobs (globSet decl, globSet used)
471 fileloc fl = uentry_whereSpecified (context_getHeader ());
473 if (fileloc_isUndefined (fl))
475 fl = uentry_whereDeclared (context_getHeader ());
478 globSet_allElements (decl, el)
480 if (!globSet_member (used, el))
482 if (sRef_isSpecInternalState (el)
483 || sRef_isNothing (el))
489 cstring sname = sRef_unparse (el);
491 if (fileloc_isLib (fl))
493 voptgenerror (FLG_USEALLGLOBS,
494 message ("Global %s listed (%q) but not used",
495 sname, fileloc_unparse (fl)),
500 voptgenerror (FLG_USEALLGLOBS,
501 message ("Global %s listed but not used", sname),
505 cstring_free (sname);
508 } end_globSet_allElements;
512 exprNode_checkAllMods (sRefSet mods, uentry ue)
514 bool realParams = FALSE;
515 uentry le = context_getHeader ();
516 fileloc fl = uentry_whereSpecified (le);
517 uentryList specParamNames = uentryList_undefined;
518 uentryList paramNames = context_getParams ();
520 if (uentry_isFunction (le))
522 specParamNames = uentry_getParams (le);
524 if (uentryList_isUndefined (specParamNames))
526 ; /* unknown params */
528 else if (uentryList_size (paramNames) != uentryList_size (specParamNames))
531 (message ("exprNode_checkAllMods: parameter lists have different sizes: "
533 uentryList_unparse (paramNames),
534 uentryList_size (paramNames),
535 uentryList_unparse (specParamNames),
536 uentryList_size (specParamNames)));
538 else if (uentryList_size (paramNames) > 0
539 && !uentry_hasRealName (uentryList_getN (specParamNames, 0)))
541 /* loaded from a library */
549 sRefSet_allElements (mods, sr)
551 if (sRef_isNothing (sr) || sRef_isSpecState (sr))
553 ; /* should report on anything? */
555 else if (sRef_isInternalState (sr))
557 if (!sRef_isModified (sr))
559 if (sRefSet_hasStatic (mods))
568 ("Function %s specified to modify internal state "
569 "but no internal state is modified",
570 uentry_rawName (ue)),
571 uentry_whereLast (ue)))
573 uentry_showWhereSpecified (le);
580 if (!sRef_isModified (sr))
582 cstring sname = realParams ? sRef_unparse (sr) : sRef_unparse (sr);
584 if (fileloc_isLib (fl) && !realParams)
588 message ("Suspect object listed (%q) in modifies "
589 "clause of %s not modified: %s",
590 fileloc_unparse (fl),
593 uentry_whereLast (ue));
599 message ("Suspect object listed in modifies of %s "
603 uentry_whereLast (ue)))
605 uentry_showWhereSpecified (le);
608 cstring_free (sname);
611 } end_sRefSet_allElements;
614 void exprNode_checkMacroBody (/*@only@*/ exprNode e)
616 if (!exprNode_isError (e))
620 if (!(context_inFunctionLike () || context_inMacroConstant ()
621 || context_inMacroUnknown ()))
625 ("exprNode_checkMacroBody: not in macro function or constant: %q",
626 context_unparse ()));
631 hdr = context_getHeader ();
633 if (e->kind == XPR_STMTLIST || e->kind == XPR_BODY)
638 ("Macro %q definition is statement list (recommend "
639 "do { ... } while (0) constuction to ensure multiple "
640 "statement macro is syntactic function)",
641 uentry_getName (hdr)),
642 fileloc_isDefined (e->loc) ? e->loc : g_currentloc);
645 if (context_inMacroConstant ())
647 ctype t = uentry_getType (hdr);
649 uentry_setDefined (hdr, e->loc);
651 if (!(exprNode_matchType (t, e)))
653 cstring uname = uentry_getName (hdr);
655 if (cstring_equal (uname, context_getTrueName ())
656 || cstring_equal (uname, context_getFalseName ()))
659 ** We need to do something special to allow FALSE and TRUE
660 ** to be defined without reporting errors. This is a tad
661 ** bogus, but otherwise lots of things would break.
665 llassert (ctype_isManifestBool (t));
666 /* Should also check type of e is a reasonable (?) bool type. */
673 ("Constant %q specified as %s, but defined as %s: %s",
674 uentry_getName (hdr),
676 ctype_unparse (e->typ),
677 exprNode_unparse (e)),
680 uentry_showWhereSpecified (hdr);
684 cstring_free (uname);
688 if (context_maybeSet (FLG_NULLSTATE)
690 && ctype_isRealPointer (t)
691 && exprNode_isNullValue (e))
693 uentry ue = usymtab_getTypeEntry (ctype_typeId (t));
694 sRef sr = uentry_getSref (ue);
696 if (!sRef_possiblyNull (sr))
700 message ("Constant %q of non-null type %s defined "
702 uentry_getName (hdr), ctype_unparse (t),
703 exprNode_unparse (e)),
704 message ("If %s can be null, add a /*@null@*/ "
705 "qualifer to its typedef.",
710 uentry_mergeConstantValue (hdr, e->val);
711 e->val = multiVal_undefined;
715 else if (context_inMacroFunction () || context_inMacroUnknown ())
717 ctype rettype = context_getRetType ();
719 if (context_isMacroMissingParams ())
721 llassert (context_inMacroFunction ());
724 ** # define newname oldname
726 ** newname is a function
727 ** specification of oldname should match
728 ** specification of newname.
731 if (!ctype_isFunction (e->typ))
735 message ("Function %s defined by unparameterized "
736 "macro not corresponding to function",
737 context_inFunctionName ()),
742 uentry ue = exprNode_getUentry (e);
744 if (uentry_isValid (ue))
747 ** Okay, for now --- should check for consistency
750 ** uentry oldue = usymtab_lookup (cfname);
753 /* check var conformance here! */
759 message ("Function %s defined by unparameterized "
760 "macro not corresponding to function",
761 context_inFunctionName ()),
765 e->typ = ctype_returnValue (e->typ);
766 rettype = e->typ; /* avoid aditional errors */
770 if (ctype_isVoid (rettype) || ctype_isUnknown (rettype))
772 ; /* don't complain when void macros have values */
774 else if (!exprNode_matchType (rettype, e))
778 message ("Function %q specified to return %s, "
779 "implemented as macro having type %s: %s",
780 uentry_getName (hdr),
781 ctype_unparse (rettype), ctype_unparse (e->typ),
782 exprNode_unparse (e)),
785 uentry_showWhereSpecified (hdr);
792 /* these expressions have values: */
793 case XPR_PARENS: case XPR_ASSIGN:
794 case XPR_EMPTY: case XPR_VAR:
795 case XPR_OP: case XPR_POSTOP:
796 case XPR_PREOP: case XPR_CALL:
797 case XPR_SIZEOFT: case XPR_SIZEOF:
798 case XPR_ALIGNOFT: case XPR_ALIGNOF:
799 case XPR_CAST: case XPR_FETCH:
800 case XPR_COMMA: case XPR_COND:
801 case XPR_ARROW: case XPR_CONST:
802 case XPR_STRINGLITERAL: case XPR_NUMLIT:
803 case XPR_FACCESS: case XPR_OFFSETOF:
805 checkReturnTransfer (e, hdr);
808 /* these expressions don't */
810 case XPR_VAARG: case XPR_ITER:
811 case XPR_FOR: case XPR_FORPRED:
812 case XPR_GOTO: case XPR_CONTINUE:
813 case XPR_BREAK: case XPR_RETURN:
814 case XPR_NULLRETURN: case XPR_IF:
815 case XPR_IFELSE: case XPR_DOWHILE:
816 case XPR_WHILE: case XPR_STMT:
817 case XPR_STMTLIST: case XPR_SWITCH:
818 case XPR_INIT: case XPR_BODY:
819 case XPR_NODE: case XPR_ITERCALL:
820 case XPR_TOK: case XPR_CASE:
821 case XPR_FTCASE: case XPR_FTDEFAULT:
822 case XPR_DEFAULT: case XPR_WHILEPRED:
823 case XPR_BLOCK: case XPR_INITBLOCK:
826 message ("Function %q specified to return %s, "
827 "implemented as macro with no result: %s",
828 uentry_getName (hdr),
829 ctype_unparse (rettype),
830 exprNode_unparse (e)),
833 uentry_showWhereSpecified (hdr);
838 usymtab_checkFinalScope (FALSE);
842 llbug (message ("exprNode_checkMacroBody: not in macro function: %q", context_unparse ()));
848 context_exitFunction ();
852 void exprNode_checkFunctionBody (exprNode body)
854 if (!exprNode_isError (body))
856 bool noret = context_getFlag (FLG_NORETURN);
857 bool checkret = exprNode_mustEscape (body);
861 && !exprNode_errorEscape (body)
862 && context_inRealFunction ()
863 && ctype_isFunction (context_currentFunctionType ()))
865 ctype tr = ctype_returnValue (context_currentFunctionType ());
867 if (!ctype_isFirstVoid (tr))
869 if (ctype_isUnknown (tr))
873 cstring_makeLiteral ("Path with no return in function declared to implicity return int"),
880 message ("Path with no return in function declared to return %t",
887 /*@i44*/ /* drl added call*/
888 // exprNode_checkFunction (context_getHeader (), body);
892 context_returnFunction ();
898 extern constraintList implicitFcnConstraints;
900 void exprNode_checkFunction (/*@unused@*/ uentry ue, exprNode body)
902 constraintList c, t, post;
903 constraintList c2, fix;
907 // context_setFlag(FLG_ORCONSTRAINT, TRUE);
908 context_enterInnerContext ();
910 exprNode_generateConstraints (body);
912 c = uentry_getFcnPreconditions (ue);
913 DPRINTF(("function constraints\n"));
914 DPRINTF (("\n\n\n\n\n\n\n"));
920 DPRINTF ( (message ("Function preconditions are %s \n\n\n\n\n", constraintList_printDetailed (c) ) ) );
922 body->requiresConstraints = reflectChangesFreePre (body->requiresConstraints, c);
924 c2 = constraintList_copy (c);
925 fix = constraintList_makeFixedArrayConstraints (body->uses);
926 c2 = reflectChangesFreePre (c2, fix);
927 constraintList_free(fix);
928 if ( context_getFlag (FLG_ORCONSTRAINT) )
930 t = reflectChangesOr (body->requiresConstraints, c2 );
934 t = reflectChanges (body->requiresConstraints, c2);
937 constraintList_free(body->requiresConstraints);
938 DPRINTF ( (message ("The body has the required constraints: %s", constraintList_printDetailed (t) ) ) );
940 body->requiresConstraints = t;
942 t = constraintList_mergeEnsures (c, body->ensuresConstraints);
943 constraintList_free(body->ensuresConstraints);
945 body->ensuresConstraints = t;
947 DPRINTF ( (message ("The body has the ensures constraints: %s", constraintList_printDetailed (t) ) ) );
948 constraintList_free(c2);
953 DPRINTF((message ("The Function %s has the preconditions %s", uentry_unparse(ue), constraintList_printDetailed(c) ) ) );
957 DPRINTF((message ("The Function %s has no preconditions", uentry_unparse(ue) ) ) );
960 if ( implicitFcnConstraints)
962 if (context_getFlag (FLG_IMPLICTCONSTRAINT) )
964 body->requiresConstraints = reflectChangesFreePre (body->requiresConstraints, implicitFcnConstraints );
968 constraintList_printError(body->requiresConstraints, g_currentloc);
971 post = uentry_getFcnPostconditions (ue);
973 if ( context_getFlag (FLG_CHECKPOST) )
978 constraintList post2;
980 DPRINTF ( (message ("The declared function postconditions are %s \n\n\n\n\n", constraintList_printDetailed (post) ) ) );
982 post = reflectChangesFreePre (post, body->ensuresConstraints);
984 post2 = constraintList_copy (post);
985 fix = constraintList_makeFixedArrayConstraints (body->uses);
986 post2 = reflectChangesFreePre (post2, fix);
987 constraintList_free(fix);
988 if ( context_getFlag (FLG_ORCONSTRAINT) )
990 t = reflectChangesOr (post2, body->ensuresConstraints);
994 t = reflectChanges (post2, body->ensuresConstraints);
997 constraintList_free(post2);
999 constraintList_free(post);
1004 printf("Unresolved post conditions\n");
1005 constraintList_printErrorPostConditions(post, g_currentloc);
1010 constraintList_free(post);
1013 constraintList_printError(body->ensuresConstraints, g_currentloc);
1016 // ConPrint (message ("Unable to resolve function constraints:\n%s", constraintList_printDetailed(body->requiresConstraints) ), g_currentloc);
1018 // ConPrint (message ("LCLint has found function post conditions:\n%s", constraintList_printDetailed(body->ensuresConstraints) ), g_currentloc);
1020 // printf ("The required constraints are:\n%s", constraintList_printDetailed(body->requiresConstraints) );
1021 // printf ("The ensures constraints are:\n%s", constraintList_printDetailed(body->ensuresConstraints) );
1024 constraintList_free(c);
1026 context_exitInnerPlain();
1028 /*is it okay not to free this?*/
1029 exprNode_free (body);
1032 void exprChecks_checkEmptyMacroBody (void)
1036 if (!(context_inFunctionLike () || context_inMacroConstant ()
1037 || context_inMacroUnknown ()))
1040 (message ("exprNode_checkEmptyMacroBody: not in macro function or constant: %q",
1041 context_unparse ()));
1045 hdr = context_getHeader ();
1049 if (uentry_isFunction (hdr))
1054 ("Macro definition for %q is empty", uentry_getName (hdr)),
1057 usymtab_checkFinalScope (FALSE);
1060 context_exitFunction ();
1064 void exprNode_checkIterBody (/*@only@*/ exprNode body)
1066 context_exitAllClauses ();
1068 context_exitFunction ();
1069 exprNode_free (body);
1072 void exprNode_checkIterEnd (/*@only@*/ exprNode body)
1074 context_exitAllClauses ();
1075 context_exitFunction ();
1076 exprNode_free (body);
1080 bool checkModifyAuxAux (sRef s, exprNode f, sRef alias, exprNode err)
1082 bool hasMods = context_hasMods ();
1083 flagcode errCode = hasMods ? FLG_MODIFIES : FLG_MODNOMODS;
1085 if (exprNode_isDefined (f))
1087 f->sets = sRefSet_insert (f->sets, s);
1090 if (context_getFlag (FLG_MODIFIES)
1091 && (hasMods || context_getFlag (FLG_MODNOMODS)))
1093 sRefSet mods = context_modList ();
1095 if (!sRef_canModify (s, mods))
1097 sRef rb = sRef_getRootBase (s);
1100 if (sRef_isGlobal (rb))
1102 if (!context_checkGlobMod (rb))
1108 if (sRef_isInvalid (alias) || sRef_sameName (s, alias))
1110 if (sRef_isLocalVar (sRef_getRootBase (s)))
1115 ("Undocumented modification of internal state (%q): %s",
1116 sRef_unparse (s), exprNode_unparse (err)),
1117 exprNode_isDefined (f) ? f->loc : g_currentloc);
1121 if (sRef_isSystemState (s))
1123 if (errCode == FLG_MODNOMODS)
1125 if (context_getFlag (FLG_MODNOMODS))
1127 errCode = FLG_MODFILESYSTEM;
1132 errCode = FLG_MODFILESYSTEM;
1138 message ("Undocumented modification of %q: %s",
1139 sRef_unparse (s), exprNode_unparse (err)),
1140 exprNode_isDefined (f) ? f->loc : g_currentloc);
1147 if (sRef_isReference (s) && !sRef_isAddress (alias))
1152 ("Possible undocumented modification of %q through alias %q: %s",
1154 sRef_unparse (alias),
1155 exprNode_unparse (err)),
1156 exprNode_isDefined (f) ? f->loc : g_currentloc);
1164 if (context_maybeSet (FLG_MUSTMOD))
1166 (void) sRef_canModify (s, context_modList ());
1169 if (sRef_isRefsField (s))
1171 sRef_setModified (s);
1179 bool checkModifyAux (sRef s, exprNode f, sRef alias, exprNode err)
1181 DPRINTF (("Check modify aux: %s", sRef_unparseFull (s)));
1183 if (sRef_isReference (s) && sRef_isObserver (s)
1184 && context_maybeSet (FLG_MODOBSERVER))
1188 if (sRef_isPointer (s))
1190 sRef base = sRef_getBase (s);
1191 sname = sRef_unparse (base);
1195 if (sRef_isAddress (s))
1197 sRef p = sRef_constructPointer (s);
1198 sname = sRef_unparse (p);
1202 sname = sRef_unparse (s);
1206 if (!sRef_isValid (alias) || sRef_sameName (s, alias))
1208 if (sRef_isMeaningful (s))
1212 message ("Suspect modification of observer %s: %s",
1213 sname, exprNode_unparse (err)),
1214 exprNode_isDefined (f) ? f->loc : g_currentloc))
1216 sRef_showExpInfo (s);
1223 message ("Suspect modification of observer returned by "
1224 "function call: %s",
1225 exprNode_unparse (err)),
1226 exprNode_isDefined (f) ? f->loc : g_currentloc);
1233 message ("Suspect modification of observer %s through alias %q: %s",
1234 sname, sRef_unparse (alias), exprNode_unparse (err)),
1235 exprNode_isDefined (f) ? f->loc : g_currentloc))
1237 sRef_showExpInfo (s);
1241 cstring_free (sname);
1244 (void) checkModifyAuxAux (s, f, alias, err);
1249 bool checkModifyValAux (sRef s, exprNode f, sRef alias, exprNode err)
1251 (void) checkModifyAuxAux (s, f, alias, err);
1256 bool checkCallModifyAux (sRef s, exprNode f, sRef alias, exprNode err)
1258 bool result = FALSE;
1260 if (sRef_isObserver (s) && context_maybeSet (FLG_MODOBSERVER))
1262 sRef p = sRef_isAddress (s) ? sRef_constructPointer (s) : s;
1263 cstring sname = sRef_unparse (p);
1265 if (!sRef_isValid (alias) || sRef_sameName (s, alias))
1267 if (sRef_isMeaningful (s))
1269 result = optgenerror
1271 message ("Suspect modification of observer %s: %s",
1272 sname, exprNode_unparse (err)),
1273 exprNode_isDefined (f) ? f->loc : g_currentloc);
1277 result = optgenerror
1279 message ("Suspect modification of observer returned by "
1280 "function call: %s",
1281 exprNode_unparse (err)),
1282 exprNode_isDefined (f) ? f->loc : g_currentloc);
1287 result = optgenerror
1290 ("Suspect modification of observer %s through alias %q: %s",
1291 sname, sRef_unparse (alias), exprNode_unparse (err)),
1292 exprNode_isDefined (f) ? f->loc : g_currentloc);
1295 cstring_free (sname);
1297 else if (context_maybeSet (FLG_MODIFIES))
1299 if (!(sRef_canModifyVal (s, context_modList ())))
1301 sRef p = sRef_isAddress (s) ? sRef_constructPointer (s) : s;
1302 cstring sname = sRef_unparse (p);
1303 bool hasMods = context_hasMods ();
1304 sRef rb = sRef_getRootBase (s);
1305 flagcode errCode = hasMods ? FLG_MODIFIES : FLG_MODNOMODS;
1308 if (sRef_isGlobal (rb))
1310 uentry ue = sRef_getUentry (rb);
1312 /* be more specific here! */
1313 if (!uentry_isCheckedModify (ue))
1321 if (!sRef_isValid (alias) || sRef_sameName (s, alias))
1323 if (sRef_isLocalVar (sRef_getRootBase (s)))
1328 ("Undocumented modification of internal "
1329 "state (%q) through call to %s: %s",
1330 sRef_unparse (s), exprNode_unparse (f),
1331 exprNode_unparse (err)),
1332 exprNode_isDefined (f) ? f->loc : g_currentloc);
1336 if (sRef_isSystemState (s))
1338 if (errCode == FLG_MODNOMODS)
1340 if (context_getFlag (FLG_MODNOMODS))
1342 errCode = FLG_MODFILESYSTEM;
1347 errCode = FLG_MODFILESYSTEM;
1351 result = optgenerror
1353 message ("Undocumented modification of %s "
1354 "possible from call to %s: %s",
1356 exprNode_unparse (f),
1357 exprNode_unparse (err)),
1358 exprNode_isDefined (f) ? f->loc : g_currentloc);
1363 result = optgenerror
1365 message ("Undocumented modification of %s possible "
1366 "from call to %s (through alias %q): %s",
1368 exprNode_unparse (f),
1369 sRef_unparse (alias),
1370 exprNode_unparse (err)),
1371 exprNode_isDefined (f) ? f->loc : g_currentloc);
1374 cstring_free (sname);
1379 if (context_maybeSet (FLG_MUSTMOD))
1381 (void) sRef_canModifyVal (s, context_modList ());
1388 void exprNode_checkCallModifyVal (sRef s, exprNodeList args, exprNode f, exprNode err)
1390 s = sRef_fixBaseParam (s, args);
1391 sRef_aliasCheckPred (checkCallModifyAux, NULL, s, f, err);
1395 exprChecks_checkExport (uentry e)
1397 if (context_checkExport (e))
1399 fileloc fl = uentry_whereDeclared (e);
1401 if (fileloc_isHeader (fl) && !fileloc_isLib (fl)
1402 && !fileloc_isImport (fl) && !uentry_isStatic (e))
1404 if (uentry_isFunction (e) ||
1405 (uentry_isVariable (e) && ctype_isFunction (uentry_getType (e))))
1409 message ("Function exported, but not specified: %q",
1410 uentry_getName (e)),
1413 else if (uentry_isExpandedMacro (e))
1417 message ("Expanded macro exported, but not specified: %q",
1418 uentry_getName (e)),
1421 else if (uentry_isVariable (e) && !uentry_isParam (e))
1425 message ("Variable exported, but not specified: %q",
1426 uentry_getName (e)),
1429 else if (uentry_isEitherConstant (e))
1433 message ("Constant exported, but not specified: %q",
1434 uentry_getName (e)),
1437 else if (uentry_isIter (e) || uentry_isEndIter (e))
1441 message ("Iterator exported, but not specified: %q",
1442 uentry_getName (e)),
1446 else if (uentry_isDatatype (e))
1448 ; /* error already reported */
1458 static void checkSafeReturnExpr (/*@notnull@*/ exprNode e)
1460 ctype tr = ctype_returnValue (context_currentFunctionType ());
1461 ctype te = exprNode_getType (e);
1463 if (!ctype_forceMatch (tr, te) && !exprNode_matchLiteral (tr, e))
1466 (te, e, tr, exprNode_undefined,
1467 message ("Return value type %t does not match declared type %t: %s",
1468 te, tr, exprNode_unparse (e)),
1474 uentry rval = context_getHeader ();
1475 sRef resultref = uentry_getSref (rval);
1477 checkReturnTransfer (e, rval);
1479 if (!(sRef_isExposed (uentry_getSref (context_getHeader ()))
1480 || sRef_isObserver (uentry_getSref (context_getHeader ())))
1481 && (context_getFlag (FLG_RETALIAS)
1482 || context_getFlag (FLG_RETEXPOSE)))
1484 sRef base = sRef_getRootBase (ret);
1485 ctype rtype = e->typ;
1487 if (ctype_isUnknown (rtype))
1492 if (ctype_isVisiblySharable (rtype))
1494 if (context_getFlag (FLG_RETALIAS))
1496 sRef_aliasCheckPred (checkRefGlobParam, NULL, base,
1497 e, exprNode_undefined);
1500 if (context_getFlag (FLG_RETEXPOSE) && sRef_isIReference (ret)
1501 && !sRef_isExposed (resultref) && !sRef_isObserver (resultref))
1503 sRef_aliasCheckPred (checkRepExposed, NULL, base, e,
1504 exprNode_undefined);