2 ** Splint - annotation-assisted static program checker
3 ** Copyright (C) 1994-2002 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 splint: splint@cs.virginia.edu
21 ** To report a bug: splint-bug@cs.virginia.edu
22 ** For more information: http://www.splint.org
28 # include "splintMacros.nf"
30 # include "transferChecks.h"
46 static void checkStructTransfer (exprNode p_lhs, sRef p_slhs, exprNode p_rhs, sRef p_srhs,
47 fileloc p_loc, transferKind p_tt);
48 static void checkMetaStateConsistent (/*@exposed@*/ sRef p_fref, sRef p_tref,
49 fileloc p_loc, transferKind p_transferType) ;
51 static void checkLeaveTrans (uentry p_actual, transferKind p_transferType);
52 static void checkTransfer (exprNode p_fexp, /*@dependent@*/ sRef p_fref,
53 exprNode p_texp, /*@dependent@*/ sRef p_tref,
54 exprNode p_fcn, /* for printing better error messages */
55 fileloc p_loc, transferKind p_transferType);
56 static void checkGlobTrans (uentry p_glob, transferKind p_type);
59 checkCompletelyDefined (exprNode p_fexp, /*@exposed@*/ sRef p_fref, sRef p_ofref,
60 exprNode p_texp, sRef p_tref,
61 bool p_topLevel, bool p_inUnion, bool p_directUnion,
62 fileloc p_loc, transferKind p_transferType, int p_depth,
65 static /*@exposed@*/ sRef dependentReference (sRef p_sr);
66 static bool canLoseLocalReference (/*@dependent@*/ sRef p_sr, fileloc p_loc) ;
69 ** returns the most specific alkind
72 alkind alkind_resolve (alkind a1, alkind a2)
74 if (a1 == AK_UNKNOWN || a1 == AK_ERROR) return a2;
75 if (a2 == AK_UNKNOWN || a2 == AK_ERROR || a2 == AK_LOCAL) return a1;
76 if (a1 == AK_LOCAL) return a2;
84 ** FCNRETURN return fref; tref is return type
85 ** GLOBASSIGN tref = fref;
86 ** FCNPASS call (fref) ; tref is the argument type
90 static /*@only@*/ cstring
91 transferErrorMessage (transferKind transferType, alkind tkind) /*@*/
96 return (message ("returned as %s", alkind_unparse (tkind)));
98 return (message ("assigned to %s", alkind_unparse (tkind)));
100 return (message ("assigned to %s", alkind_unparse (tkind)));
102 return (message ("used as initial value for %s",
103 alkind_unparse (tkind)));
105 return (message ("passed as %s param", alkind_unparse (tkind)));
111 static /*@only@*/ cstring
112 transferErrorExcerpt (transferKind transferType, exprNode fexp, exprNode texp, exprNode fcn) /*@*/
114 switch (transferType)
117 return (message ("return %s", exprNode_unparse (fexp)));
121 return (message ("%s = %s", exprNode_unparse (texp), exprNode_unparse (fexp)));
123 if (exprNode_isDefined (fcn))
125 return message ("%s(..., %s, ...)",
126 exprNode_unparse (fcn),
127 exprNode_unparse (fexp));
131 return cstring_copy (exprNode_unparse (fexp));
139 transferErrorExpMessage (transferKind transferType, exkind tkind) /*@*/
141 if (exkind_isUnknown (tkind))
143 switch (transferType)
146 return (cstring_makeLiteral ("returned without qualification"));
149 return (cstring_makeLiteral ("assigned to unqualified reference"));
151 return (cstring_makeLiteral ("passed without qualification"));
153 return (cstring_makeLiteral ("used as initial value for unqualified storage"));
159 switch (transferType)
162 return (message ("returned as %s", exkind_unparse (tkind)));
165 return (message ("assigned to %s", exkind_unparse (tkind)));
167 return (message ("passed as %s param", exkind_unparse (tkind)));
175 static /*@observer@*/ cstring
176 transferNullMessage (transferKind transferType) /*@*/
178 switch (transferType)
181 return (cstring_makeLiteralTemp ("returned as non-null"));
184 return (cstring_makeLiteralTemp ("assigned to non-null"));
186 return (cstring_makeLiteralTemp ("initialized to non-null"));
188 return (cstring_makeLiteralTemp ("passed as non-null param"));
194 static /*@dependent@*/ exprNode atFunction = exprNode_undefined;
195 static int atArgNo = 0;
196 static int atNumArgs = 0;
198 static cstring generateText (exprNode e1, exprNode e2,
199 sRef tref, transferKind tt)
202 if (tt == TT_DOASSIGN || tt == TT_GLOBINIT)
204 return (message ("%s = %s", exprNode_unparse (e2),
205 exprNode_unparse (e1)));
207 else if (tt == TT_FIELDASSIGN)
209 return (message ("%s = %s (field %q)",
210 exprNode_unparse (e2),
211 exprNode_unparse (e1),
212 sRef_unparse (tref)));
214 else if (tt == TT_FCNPASS)
216 return (message ("%s (%s%s%s)",
217 exprNode_unparse (atFunction),
218 (atArgNo == 1 ? cstring_undefined
219 : cstring_makeLiteralTemp ("..., ")),
220 exprNode_unparse (e1),
221 (atArgNo == atNumArgs ? cstring_undefined
222 : cstring_makeLiteralTemp (", ..."))));
226 return (cstring_copy (exprNode_unparse (e1)));
230 static /*@observer@*/ cstring
231 transferType_unparse (transferKind transferType) /*@*/
233 switch (transferType)
236 return (cstring_makeLiteralTemp ("Returned"));
239 return (cstring_makeLiteralTemp ("Assigned"));
241 return (cstring_makeLiteralTemp ("Passed"));
243 return (cstring_makeLiteralTemp ("Initialized"));
245 return (cstring_makeLiteralTemp ("GLOB RETURN!"));
247 return (cstring_makeLiteralTemp ("GLOB PASS!"));
249 return (cstring_makeLiteralTemp ("PARAM RETURN!"));
251 return (cstring_makeLiteralTemp ("LEAVE TRANS!"));
257 static /*@observer@*/ cstring udError (sRef s)
261 return cstring_makeLiteralTemp ("released");
263 else if (sRef_isAllocated (s))
265 return cstring_makeLiteralTemp ("allocated but not defined");
269 return cstring_makeLiteralTemp ("undefined");
274 cstring defExpl (sRef s) /*@*/
276 sRef rb = sRef_getRootBase (s);
278 if (sRef_sameName (rb, s))
280 if (sRef_isAllocated (s))
282 return cstring_makeLiteral (" (allocated only)");
284 return cstring_undefined;
288 return (message (" (%q is %s)", sRef_unparse (s), udError (s)));
294 ** More than just definition checking --- checks for consistent state also!
296 ** Returns TRUE if fref is completely defined.
297 ** if !report, returns TRUE unless error is at the deep level.
301 checkCompletelyDefined (exprNode fexp, /*@exposed@*/ sRef fref, sRef ofref,
302 exprNode texp, sRef tref,
303 bool topLevel, bool inUnion, bool directUnion,
304 fileloc loc, transferKind transferType,
305 int depth, bool report)
308 alkind fkind = sRef_getAliasKind (fref);
309 alkind tkind = sRef_getAliasKind (tref);
311 DPRINTF (("Check completely defined: %s [%s] / %s [%s]",
312 exprNode_unparse (fexp), sRef_unparseFull (fref),
313 exprNode_unparse (texp), sRef_unparseFull (tref)));
315 if (depth > MAXDEPTH)
319 ("Check definition limit exceeded, checking %q. "
320 "This either means there is a variable with at least "
321 "%d indirections apparent in the program text, or "
322 "there is a bug in Splint.",
329 if (!sRef_isKnown (fref))
334 if (sRef_isDead (fref))
336 DPRINTF (("Dead storage to completely defined: %s", sRef_unparseFull (fref)));
339 if (alkind_isStack (fkind))
341 ctype rt = ctype_realType (sRef_getType (tref));
343 if (ctype_isMutable (rt) && !ctype_isSU (rt))
345 if (transferType == TT_PARAMRETURN)
350 ("Stack-allocated storage %qreachable from parameter %q",
351 sRef_unparseOpt (fref),
352 sRef_unparse (ofref)),
355 sRef_showAliasInfo (fref);
358 else if (transferType == TT_GLOBRETURN)
363 ("Stack-allocated storage %qreachable from global %q",
364 sRef_unparseOpt (fref),
365 sRef_unparse (ofref)),
368 sRef_showAliasInfo (fref);
371 else if (transferType == TT_FCNRETURN)
376 ("Stack-allocated storage %qreachable from return value: %s",
377 sRef_unparseOpt (fref),
378 exprNode_unparse (fexp)),
381 sRef_showAliasInfo (fref);
393 DPRINTF (("From: %s ==> %s",
394 sRef_unparseFull (fref),
395 sRef_unparseFull (tref)));
397 checkMetaStateConsistent (fref, tref, loc, transferType);
399 if ((sRef_isObserver (fref) && !sRef_isObserver (tref))
400 || (sRef_isExposed (fref) && !(sRef_isObserver (tref)
401 || sRef_isExposed (tref))))
403 flagcode code = (sRef_isObserver (fref)
404 ? FLG_OBSERVERTRANS : FLG_EXPOSETRANS);
406 if (!sRef_isStateLive (fref))
408 ; /* no error (will be a definition error) */
410 else if (transferType == TT_DOASSIGN
411 || transferType == TT_FIELDASSIGN
412 || transferType == TT_GLOBINIT
413 || transferType == TT_FCNPASS)
417 else if (transferType == TT_PARAMRETURN)
422 ("%s storage %qreachable from %s parameter",
423 exkind_capName (sRef_getExKind (fref)),
424 sRef_unparseOpt (fref),
425 exkind_unparseError (sRef_getExKind (tref))),
428 sRef_showExpInfo (fref);
429 sRef_setExKind (fref, XO_UNKNOWN, loc);
432 else if (transferType == TT_LEAVETRANS)
436 else if (transferType == TT_GLOBINIT)
441 ("%s storage %qreachable from %s initial value",
442 exkind_capName (sRef_getExKind (fref)),
443 sRef_unparseOpt (fref),
444 exkind_unparseError (sRef_getExKind (tref))),
447 sRef_showExpInfo (fref);
448 sRef_setExKind (fref, XO_UNKNOWN, loc);
451 else if (transferType == TT_GLOBRETURN)
456 ("%s storage %qreachable from %s global",
457 exkind_capName (sRef_getExKind (fref)),
458 sRef_unparseOpt (fref),
459 exkind_unparseError (sRef_getExKind (tref))),
462 sRef_showExpInfo (fref);
463 sRef_setExKind (fref, XO_UNKNOWN, loc);
466 else if (transferType == TT_FCNRETURN)
471 ("%s storage %qreachable from %s return value",
472 exkind_capName (sRef_getExKind (fref)),
473 sRef_unparseOpt (fref),
474 exkind_unparseError (sRef_getExKind (tref))),
477 sRef_showExpInfo (fref);
478 sRef_setExKind (fref, XO_UNKNOWN, loc);
483 llcontbug (message ("Transfer type: %s",
484 transferType_unparse (transferType)));
489 ("%s storage %qreachable from %s return value",
490 exkind_capName (sRef_getExKind (fref)),
491 sRef_unparseOpt (fref),
492 exkind_unparseError (sRef_getExKind (tref))),
495 sRef_showExpInfo (fref);
496 sRef_setExKind (fref, XO_UNKNOWN, loc);
502 if (!alkind_compatible (fkind, tkind))
504 if (fkind == AK_UNKNOWN && !sRef_isStateLive (fref))
506 ; /* no error (will be a definition error) */
508 else if (transferType == TT_DOASSIGN)
512 else if (transferType == TT_FCNPASS)
514 if (alkind_isKnown (sRef_getAliasKind (tref)))
519 ("Storage %qreachable from passed parameter "
520 "is %s (should be %s): %s",
521 sRef_unparseOpt (fref),
522 alkind_unparse (sRef_getAliasKind (fref)),
523 alkind_unparse (sRef_getAliasKind (tref)),
524 exprNode_unparse (fexp)),
527 sRef_showAliasInfo (fref);
531 else if (transferType == TT_PARAMRETURN)
533 bool noerror = FALSE;
535 if (alkind_isDependent (sRef_getAliasKind (fref)))
537 if (canLoseLocalReference (fref, loc))
547 ("Storage %qreachable from parameter is %s (should be %s)",
548 sRef_unparseOpt (fref),
549 alkind_unparse (sRef_getAliasKind (fref)),
550 alkind_unparse (sRef_getAliasKind (tref))),
553 sRef_showAliasInfo (fref);
556 else if (transferType == TT_LEAVETRANS)
561 ("Storage %qreachable from temporary reference is %s "
562 "at scope exit (should be %s)",
563 sRef_unparseOpt (fref),
564 alkind_unparse (sRef_getAliasKind (fref)),
565 alkind_unparse (sRef_getAliasKind (tref))),
568 sRef_showAliasInfo (fref);
571 else if (transferType == TT_GLOBRETURN)
576 ("Storage %qreachable from global is %s (should be %s)",
577 sRef_unparseOpt (fref),
578 alkind_unparse (sRef_getAliasKind (fref)),
579 alkind_unparse (sRef_getAliasKind (tref))),
582 sRef_showAliasInfo (fref);
585 else if (transferType == TT_FCNRETURN)
590 ("Storage %qreachable from return value is %s (should be %s)",
591 sRef_unparseOpt (fref),
592 alkind_unparse (sRef_getAliasKind (fref)),
593 alkind_unparse (sRef_getAliasKind (tref))),
596 sRef_showAliasInfo (fref);
599 else if (transferType == TT_GLOBINIT)
604 ("Storage %qreachable from initial value is %s (should be %s)",
605 sRef_unparseOpt (fref),
606 alkind_unparse (sRef_getAliasKind (fref)),
607 alkind_unparse (sRef_getAliasKind (tref))),
610 sRef_showAliasInfo (fref);
615 llcontbug (message ("Transfer type: %s",
616 transferType_unparse (transferType)));
621 ("Storage %qreachable from return value is %s (should be %s)",
622 sRef_unparseOpt (fref),
623 alkind_unparse (sRef_getAliasKind (fref)),
624 alkind_unparse (sRef_getAliasKind (tref))),
627 sRef_showAliasInfo (fref);
632 if (sRef_isDead (fref))
639 if (transferType == TT_PARAMRETURN)
644 ("Released storage %q reachable from parameter at return point",
645 sRef_unparse (fref)),
648 sRef_showStateInfo (fref);
652 else if (transferType == TT_LEAVETRANS)
656 message ("Released storage %q reachable from temporary "
657 "reference at scope exit",
658 sRef_unparse (fref)),
661 sRef_showStateInfo (fref);
665 else if (transferType == TT_GLOBRETURN)
669 message ("Released storage %q reachable from global",
670 sRef_unparse (fref)),
673 sRef_showStateInfo (fref);
677 else if (transferType == TT_FCNPASS)
681 message ("Released storage %q reachable from passed parameter",
682 sRef_unparse (fref)),
685 sRef_showStateInfo (fref);
693 message ("Released storage %q reachable from parameter",
694 sRef_unparse (fref)),
697 sRef_showStateInfo (fref);
705 && sRef_possiblyNull (fref)
706 && !sRef_perhapsNull (tref)
707 && ctype_isRealPointer (sRef_getType (tref))
708 && !usymtab_isGuarded (fref))
710 if (transferType == TT_FCNRETURN)
714 message ("%q storage %qderivable from return value: %s",
715 cstring_capitalize (sRef_nullMessage (fref)),
716 sRef_unparseOpt (fref),
717 exprNode_unparse (fexp)),
720 sRef_showNullInfo (fref);
722 DPRINTF (("fref: %s", sRef_unparseFull (fref)));
723 DPRINTF (("tref: %s", sRef_unparseFull (tref)));
725 sRef_setNullError (fref);
728 else if (transferType == TT_GLOBRETURN || transferType == TT_PARAMRETURN)
733 ("Function returns with %s storage derivable from %q %q",
734 sRef_nullMessage (fref),
735 cstring_makeLiteral ((transferType == TT_GLOBRETURN)
736 ? "global" : "parameter"),
737 sRef_unparse (fref)),
740 sRef_showNullInfo (fref);
741 sRef_setNullError (fref);
744 else if (transferType == TT_GLOBPASS)
748 message ("Function called with %s storage "
749 "derivable from global %q",
750 sRef_nullMessage (fref),
751 sRef_unparse (fref)),
754 sRef_showNullInfo (fref);
755 sRef_setNullError (fref);
758 else if (transferType == TT_FCNPASS)
762 message ("%q storage %qderivable from parameter %q",
763 cstring_capitalize (sRef_nullMessage (fref)),
764 sRef_unparseOpt (fref),
765 generateText (fexp, exprNode_undefined,
766 sRef_undefined, TT_FCNPASS)),
769 DPRINTF (("fref: %s", sRef_unparseFull (fref)));
770 DPRINTF (("tref: %s", sRef_unparseFull (tref)));
771 sRef_showNullInfo (fref);
772 sRef_setNullError (fref);
777 llassert (transferType == TT_DOASSIGN
778 || transferType == TT_GLOBINIT
779 || transferType == TT_LEAVETRANS);
783 if (sRef_isRelDef (tref)
784 || sRef_isPartial (tref)
785 || sRef_isAllocated (tref)
786 || sRef_isStateSpecial (tref))
788 /* should check fref is allocated? */
792 ct = ctype_realType (sRef_getType (fref));
794 DPRINTF (("Here: %s", ctype_unparse (ct)));
796 if (!(sRef_isAnyDefined (fref)
797 || sRef_isPdefined (fref)
798 || sRef_isAllocated (fref)
799 || sRef_isStateUnknown (fref)))
801 if (transferType == TT_GLOBRETURN)
806 message ("Function returns with global %q not "
807 "completely defined%q",
808 sRef_unparse (sRef_getRootBase (fref)),
812 sRef_showStateInfo (fref);
813 sRef_setDefined (fref, loc);
816 else if (transferType == TT_GLOBPASS)
822 ("Function called with global %q not completely defined%q",
823 sRef_unparse (sRef_getRootBase (fref)),
827 sRef_showStateInfo (fref);
828 sRef_setDefined (fref, loc);
831 else if (transferType == TT_PARAMRETURN)
833 if (report && !topLevel
836 message ("Function returns storage %q reachable from parameter not "
837 "completely defined%q",
838 sRef_unparse (ofref),
842 sRef_showStateInfo (fref);
843 sRef_setDefined (fref, loc);
846 else if (transferType == TT_LEAVETRANS)
848 if (report && !topLevel
851 message ("Scope exits with storage %q reachable from "
852 "temporary reference not completely defined%q",
853 sRef_unparse (ofref),
857 sRef_showStateInfo (fref);
858 sRef_setDefined (fref, loc);
863 if (transferType != TT_DOASSIGN
864 && (!(sRef_isNew (fref) || sRef_isType (fref))))
868 DPRINTF (("Here we are: %s", sRef_unparseFull (fref)));
870 if (sRef_isDead (fref))
874 message ("%s storage %qwas released: %q",
875 transferType_unparse (transferType),
876 sRef_unparseOpt (fref),
877 generateText (fexp, texp, tref, transferType)),
880 sRef_showStateInfo (fref);
888 ("%s storage %qnot completely defined%q: %q",
889 transferType_unparse (transferType),
890 sRef_unparseOpt (ofref),
892 generateText (fexp, texp, tref, transferType)),
895 sRef rb = sRef_getRootBase (fref);
896 sRef_showStateInfo (fref);
898 sRef_setDefinedCompleteDirect (rb, loc);
906 if (sRef_isAllocated (fref) && sRef_isValid (tref)
907 && (transferType == TT_DOASSIGN))
909 sRef_setAllocatedComplete (tref, loc);
918 if (ctype_isUnknown (ct))
922 else if (ctype_isPointer (ct) || ctype_isArray (ct)) /* evans 2001-07-12 added ctype_isArray */
924 ctype tct = ctype_realType (sRef_getType (tref));
926 if (sRef_isStateUnknown (fref))
932 DPRINTF (("Here fref: %s", sRef_unparseFull (fref)));
933 DPRINTF (("Here tref: %s", sRef_unparseFull (tref)));
935 if (ctype_isAP (tct) || ctype_isUnknown (tct))
937 sRef fptr = sRef_constructDeref (fref);
938 sRef tptr = sRef_constructDeref (tref);
940 DPRINTF (("Here tptr: %s", sRef_unparseFull (tptr)));
942 return (checkCompletelyDefined (fexp, fptr, ofref,
944 FALSE, inUnion, FALSE, loc,
945 transferType, depth + 1, report));
953 else if (ctype_isStruct (ct))
955 ctype tct = ctype_realType (sRef_getType (tref));
957 DPRINTF (("Struct defined: %s", ctype_unparse (tct)));
959 if (ctype_match (ct, tct))
962 bool hasOneDefined = FALSE;
963 cstringSList badFields = cstringSList_undefined;
965 if (sRef_isStateUnknown (fref) || sRef_isAllocated (tref))
970 DPRINTF (("Check field: %s", sRef_unparseFull (fref)));
972 if (sRef_isPdefined (fref) || sRef_isAnyDefined (fref))
974 DPRINTF (("Is defined: %s", sRef_unparse (fref)));
976 sRefSet_realElements (sRef_derivedFields (fref), sr)
980 hasOneDefined = TRUE;
982 DPRINTF (("Check derived: %s", sRef_unparseFull (sr)));
984 if (sRef_isField (sr))
986 cstring fieldname = sRef_getField (sr);
987 sRef fldref = sRef_makeField (tref, fieldname);
988 bool shouldCheck = !sRef_isRecursiveField (fldref);
994 (checkCompletelyDefined (fexp, sr, ofref,
996 FALSE, inUnion, FALSE, loc,
997 transferType, depth + 1,
1008 badFields = cstringSList_add (badFields,
1009 sRef_getField (sr));
1012 } end_sRefSet_realElements;
1014 else if (sRef_isAllocated (fref))
1017 ** for structures, each field must be completely defined
1020 uentryList fields = ctype_getFields (ct);
1022 uentryList_elements (fields, ue)
1025 cstring name = uentry_getRealName (ue);
1026 sRef ffield = sRef_makeField (fref, name);
1027 sRef tfield = sRef_makeField (tref, name);
1028 bool shouldCheck = !sRef_isRecursiveField (tfield);
1036 thisField = ynm_toBoolRelaxed
1037 (checkCompletelyDefined (fexp, ffield, ofref,
1039 FALSE, inUnion, FALSE,
1047 badFields = cstringSList_add (badFields, uentry_rawName (ue));
1051 hasOneDefined = TRUE;
1053 } end_uentryList_elements;
1057 DPRINTF (("Not checking: %s", sRef_unparseFull (fref)));
1060 if (!isOk && (!inUnion || hasOneDefined))
1062 if (transferType == TT_GLOBRETURN)
1066 message ("Global storage %q contains %d undefined field%& "
1067 "when call returns: %q",
1068 sRef_unparse (fref),
1069 cstringSList_size (badFields),
1070 cstringSList_unparseAbbrev (badFields)),
1073 sRef_setDefined (fref, loc);
1076 else if (transferType == TT_GLOBPASS)
1080 message ("Global storage %q contains %d undefined field%& "
1082 sRef_unparse (fref),
1083 cstringSList_size (badFields),
1084 cstringSList_unparseAbbrev (badFields)),
1087 sRef_setDefined (fref, loc);
1090 else if (transferType == TT_PARAMRETURN)
1094 message ("Storage %qreachable from parameter "
1095 "contains %d undefined field%&: %q",
1096 sRef_unparseOpt (fref),
1097 cstringSList_size (badFields),
1098 cstringSList_unparseAbbrev (badFields)),
1101 sRef_setDefined (fref, loc);
1104 else if (transferType == TT_LEAVETRANS)
1112 message ("%s storage %qcontains %d undefined field%&: %q",
1113 transferType_unparse (transferType),
1114 sRef_unparseOpt (fref),
1115 cstringSList_size (badFields),
1116 cstringSList_unparseAbbrev (badFields)),
1119 sRef_setDefined (fref, loc);
1124 cstringSList_free (badFields);
1130 return (ynm_fromBool (hasOneDefined));
1139 return (ynm_fromBool (!report || isOk));
1147 else if (ctype_isUnion (ct))
1149 if (sRef_isStateUnknown (fref) || sRef_isAllocated (tref))
1155 ctype tct = ctype_realType (sRef_getType (tref));
1157 if (ctype_isKnown (tct) && ctype_match (ct, tct))
1159 cstringSList goodFields = cstringSList_new ();
1161 int nelements = sRefSet_size (sRef_derivedFields (fref));
1164 ** for unions, at least one field must be completely defined
1167 if (sRef_isPdefined (fref) || sRef_isAnyDefined (fref))
1172 sRefSet_realElements (sRef_derivedFields (fref), sr)
1176 if (sRef_isField (sr))
1178 sRef fldref = sRef_makeField (tref, sRef_getField (sr));
1180 DPRINTF (("Trying union field: %s", sRef_unparseFull (fldref)));
1182 thisField = ynm_toBoolStrict
1183 (checkCompletelyDefined
1185 texp, fldref, FALSE, inUnion,
1186 (nelements > 1 ? TRUE : FALSE),
1187 loc, transferType, depth + 1, FALSE));
1191 goodFields = cstringSList_add
1192 (goodFields, sRef_getField (sr));
1195 } end_sRefSet_realElements;
1197 if (cstringSList_empty (goodFields)
1199 && context_getFlag (FLG_UNIONDEF))
1203 if (transferType == TT_PARAMRETURN)
1207 message ("Union %q reachable from parameter has "
1209 sRef_unparse (fref)),
1212 else if (transferType == TT_LEAVETRANS)
1216 message ("Union %q has no defined field at scope exit",
1217 sRef_unparse (fref)),
1220 /* evans 2001-08-21: added this branch for global returns */
1221 else if (transferType == TT_GLOBRETURN)
1225 message ("Union %q reachable from global %q has "
1227 sRef_unparse (fref),
1228 sRef_unparse (sRef_getRootBase (fref))),
1231 else if (transferType == TT_DOASSIGN
1232 || transferType == TT_FIELDASSIGN
1233 || transferType == TT_GLOBINIT)
1241 message ("%s union %q has no defined field",
1242 transferType_unparse (transferType),
1243 sRef_unparse (fref)),
1250 cstringSList_free (goodFields);
1251 return ynm_fromBool (!report || isOk);
1264 ** fref is being free'd
1268 DSC_GLOB, DSC_LOCAL, DSC_PARAM, DSC_STRUCT
1271 static /*@observer@*/ cstring dscCode_unparse (dscCode desc) /*@*/
1276 return cstring_makeLiteralTemp ("killed global");
1278 return cstring_makeLiteralTemp ("variable declared in this scope");
1280 return cstring_makeLiteralTemp ("released storage");
1282 return cstring_makeLiteralTemp ("released structure parameter");
1289 checkCompletelyDestroyed (exprNode p_fexp, sRef p_fref, bool p_topLevel, bool p_isField,
1290 fileloc p_loc, int p_depth, dscCode p_desc,
1293 bool transferChecks_globalDestroyed (sRef fref, fileloc loc)
1295 DPRINTF (("Global destroyed: %s", sRef_unparseFull (fref)));
1296 return (checkCompletelyDestroyed (exprNode_undefined, fref, TRUE, FALSE,
1297 loc, 0, DSC_GLOB, FALSE));
1300 void transferChecks_localDestroyed (sRef fref, fileloc loc)
1302 if (sRef_isObserver (fref) || sRef_isExposed (fref)
1303 || sRef_isPartial (fref))
1309 (void) checkCompletelyDestroyed (exprNode_undefined, fref, TRUE, FALSE,
1310 loc, 0, DSC_LOCAL, FALSE);
1314 void transferChecks_structDestroyed (sRef fref, fileloc loc)
1316 DPRINTF (("Check struct destroyed: %s", sRef_unparse (fref)));
1318 if (sRef_isObserver (fref) || sRef_isExposed (fref)
1319 || sRef_isPartial (fref))
1321 DPRINTF (("Its exposed!"));;
1325 (void) checkCompletelyDestroyed (exprNode_undefined, fref, TRUE, FALSE,
1326 loc, 0, DSC_STRUCT, FALSE);
1331 checkCompletelyDestroyed (exprNode fexp, sRef fref, bool topLevel, bool isField,
1332 fileloc loc, int depth,
1333 dscCode desc, bool hideErrors)
1337 DPRINTF (("Check completely destroyed: %s / %s",
1338 sRef_unparse (fref),
1339 bool_unparse (hideErrors)));
1341 if (depth > MAXDEPTH)
1343 llquietbug (message ("checkCompletelyDestroyed: too deep: %s / %q",
1344 exprNode_unparse (fexp),
1345 sRef_unparseFull (fref)));
1349 if (!sRef_isKnown (fref)) return TRUE;
1351 /* evans 2001-03-24: added this. Definitely null values are always destroyed. */
1353 if (sRef_isDefinitelyNull (fref))
1358 if (sRef_isDependent (fref) || sRef_isShared (fref) || sRef_isKept (fref))
1365 ** evans 2001-03-24: if there is a dependent reference to this storage,
1366 ** no need to destroy, but make it responsible.
1369 sRef depRef = dependentReference (fref);
1371 DPRINTF (("Destroyed? %s / %s",
1372 sRef_unparseFull (fref),
1373 sRef_unparseFull (depRef)));
1375 DPRINTF (("Aliases: %s", usymtab_unparseAliases ()));
1377 if (sRef_isValid (depRef))
1380 ** If the referenced storage was not dependent, we make
1381 ** the reference the owner since it must eventually be
1385 if (!sRef_isDependent (depRef))
1387 sRef_setOnly (depRef, loc); /* could be owned? */
1390 sRef_kill (fref, loc);
1395 ct = ctype_realType (sRef_getType (fref));
1397 if (sRef_isPdefined (fref)
1400 && !context_getFlag (FLG_STRICTDESTROY))
1403 ** Don't report errors for array elements (unless strictdestroy)
1404 ** when at least one appears to have been destroyed.
1407 DPRINTF (("Partial: %s / hiding errors: %s", sRef_unparseFull (fref),
1408 ctype_unparse (ct)));
1410 /* Don't report any more errors, but still change ownership. */
1413 if (usymtab_isDefinitelyNull (fref))
1415 DPRINTF (("Probably null!"));
1420 ** evans 2002-01-02: removed this
1421 ** if (!context_flagOn (FLG_COMPDESTROY, loc))
1426 ** if (!context_getFlag (FLG_MUSTFREEONLY)) return TRUE;
1429 DPRINTF (("Here: %s", ctype_unparse (ct)));
1433 bool docheck = FALSE;
1436 if (sRef_isFresh (fref) || sRef_isOnly (fref))
1440 DPRINTF (("Here: %s", ctype_unparse (ct)));
1441 if (sRef_isDead (fref)
1442 || sRef_isUnuseable (fref)
1443 || sRef_definitelyNull (fref)
1444 || sRef_isObserver (fref)
1445 || sRef_isExposed (fref))
1453 if (sRef_isPossiblyDead (fref) || sRef_isRelDef (fref))
1455 if (exprNode_isDefined (fexp))
1461 (FLG_COMPDESTROY, FLG_STRICTDESTROY,
1462 message ("Only storage %q (type %s) derived from %s "
1463 "may not have been released: %s",
1464 sRef_unparse (fref),
1465 ctype_unparse (sRef_getType (fref)),
1466 dscCode_unparse (desc),
1467 exprNode_unparse (fexp)),
1476 (FLG_COMPDESTROY, FLG_STRICTDESTROY,
1478 ("Only storage %q (type %s) derived from %s "
1479 "may not have been released",
1480 sRef_unparse (fref),
1481 ctype_unparse (sRef_getType (fref)),
1482 dscCode_unparse (desc)),
1488 sRef_kill (fref, loc); /* prevent further errors */
1493 if (sRef_isStateUndefined (fref))
1495 DPRINTF (("Here: %s", ctype_unparse (ct)));
1500 if (exprNode_isDefined (fexp))
1502 DPRINTF (("Here: %s", sRef_unparseFull (fref)));
1509 message ("Only storage %q (type %s) derived from %s "
1510 "is not released (memory leak): %s",
1511 sRef_unparse (fref),
1512 ctype_unparse (sRef_getType (fref)),
1513 dscCode_unparse (desc),
1514 exprNode_unparse (fexp)),
1524 message ("Only storage %q (type %s) derived from %s "
1525 "is not released (memory leak)",
1526 sRef_unparse (fref),
1527 ctype_unparse (sRef_getType (fref)),
1528 dscCode_unparse (desc)),
1536 /* sRef_kill (fref, loc); */ /* prevent further errors */
1537 DPRINTF (("Killed: %s", sRef_unparseFull (fref)));
1542 DPRINTF (("Here: %s", ctype_unparse (ct)));
1546 if (/*! evs-2002-03-24 sRef_isAnyDefined (fref) || */
1548 || (sRef_isPdefined (fref)
1549 && sRefSet_isEmpty (sRef_derivedFields (fref))))
1551 DPRINTF (("Here: %s [%s / %s]",
1552 sRef_unparseFull (fref),
1553 bool_unparse (sRef_isAnyDefined (fref)),
1554 bool_unparse (sRef_isDead (fref))));
1559 DPRINTF (("Here..."));
1561 if (ctype_isPointer (ct))
1563 sRef fptr = sRef_constructDeadDeref (fref);
1566 res = checkCompletelyDestroyed (fexp, fptr, FALSE, FALSE,
1567 loc, depth + 1, desc, hideErrors);
1571 else if (ctype_isArray (ct))
1573 if ((sRef_isStateUnknown (fref) || sRef_isAllocated (fref))
1574 && !sRef_hasDerived (fref))
1577 ** Bogosity necessary to prevent infinite depth.
1584 sRef farr = sRef_constructDeadDeref (fref);
1586 return (checkCompletelyDestroyed (fexp, farr, FALSE, FALSE,
1587 loc, depth + 1, desc, hideErrors));
1590 else if (ctype_isStruct (ct))
1593 ** for structures, each field must be completely destroyed
1597 uentryList fields = ctype_getFields (ct);
1599 DPRINTF (("Struct fields: %s", uentryList_unparse (fields)));
1601 if (depth >= MAXDEPTH)
1603 llquietbug (message ("checkCompletelyDestroyed (fields): too deep: %s / %q",
1604 exprNode_unparse (fexp),
1605 sRef_unparseFull (fref)));
1611 uentryList_elements (fields, ue)
1613 sRef field = sRef_makeField (fref, uentry_rawName (ue));
1616 ** note order of && operands --- want to report multiple errors
1619 DPRINTF (("Check field: %s", sRef_unparseFull (field)));
1621 isOk = (checkCompletelyDestroyed (fexp, field, FALSE, TRUE,
1622 loc, depth + 1, desc, hideErrors)
1624 } end_uentryList_elements;
1636 transferChecks_return (exprNode fexp, uentry rval)
1638 sRef uref = uentry_getSref (rval);
1639 sRef rref = sRef_makeNew (sRef_getType (uref), uref, cstring_undefined);
1640 uentry fcn = context_getHeader ();
1641 sRef fref = exprNode_getSref (fexp);
1642 stateClauseList clauses = uentry_getStateClauseList (fcn);
1644 DPRINTF (("Check return: %s as %s = %s",
1645 exprNode_unparse (fexp),
1646 sRef_unparseFull (uref),
1647 sRef_unparseFull (rref)));
1649 /* evans 2001-07-18: removed: if (sRef_isStateSpecial (rref)) */
1651 DPRINTF (("Check state clauses: %s",
1652 stateClauseList_unparse (clauses)));
1654 stateClauseList_postElements (clauses, cl)
1656 if (stateClause_isGlobal (cl))
1660 else if (stateClause_setsMetaState (cl))
1662 sRefSet refs = stateClause_getRefs (cl);
1663 qual ql = stateClause_getMetaQual (cl);
1664 annotationInfo ainfo = qual_getAnnotationInfo (ql);
1665 metaStateInfo minfo = annotationInfo_getState (ainfo);
1666 cstring key = metaStateInfo_getName (minfo);
1667 int mvalue = annotationInfo_getValue (ainfo);
1669 DPRINTF (("Return check: %s", stateClause_unparse (cl)));
1671 sRefSet_elements (refs, el)
1673 sRef base = sRef_getRootBase (el);
1675 DPRINTF (("Sets meta state! %s", stateClause_unparse (cl)));
1677 if (sRef_isResult (base))
1679 sRef sr = sRef_fixBase (el, fref);
1681 if (!sRef_checkMetaStateValue (sr, key, mvalue))
1685 message ("Result state %q does not satisfy ensures "
1686 "clause: %q (state is %q, should be %s): %s",
1688 stateClause_unparse (cl),
1689 stateValue_unparseValue (sRef_getMetaStateValue (sr, key),
1691 metaStateInfo_unparseValue (minfo, mvalue),
1692 exprNode_unparse (fexp)),
1693 exprNode_loc (fexp)))
1695 sRef_showAliasInfo (sr);
1703 ** Non-results are checked in exit scope.
1706 } end_sRefSet_elements ;
1710 sRefSet refs = stateClause_getRefs (cl);
1711 sRefTest tst = stateClause_getPostTestFunction (cl);
1712 sRefMod modf = stateClause_getReturnEffectFunction (cl);
1714 DPRINTF (("Clause: %s / %s",
1715 stateClause_unparse (cl),
1716 sRefSet_unparse (refs)));
1718 sRefSet_elements (refs, el)
1720 sRef base = sRef_getRootBase (el);
1722 DPRINTF (("el: %s / %s", sRef_unparse (el),
1723 sRef_unparse (base)));
1725 if (sRef_isResult (base))
1727 sRef sr = sRef_fixBase (el, fref);
1729 if (tst != NULL && !(tst (sr)))
1732 (stateClause_postErrorCode (cl),
1733 message ("%s storage %q corresponds to "
1734 "storage %q listed in %q clause: %s",
1735 stateClause_postErrorString (cl, sr),
1738 stateClause_unparseKind (cl),
1739 exprNode_unparse (fexp)),
1740 exprNode_loc (fexp)))
1742 sRefShower ss = stateClause_getPostTestShower (cl);
1753 modf (sr, exprNode_loc (fexp));
1759 ** Non-results are checked in exit scope.
1762 } end_sRefSet_elements ;
1764 } end_stateClauseList_postElements ;
1766 if (ctype_isRealSU (exprNode_getType (fexp)))
1768 sRef ffref = exprNode_getSref (fexp);
1770 checkStructTransfer (exprNode_undefined, rref,
1772 exprNode_loc (fexp),
1777 (void) checkTransfer (fexp, exprNode_getSref (fexp),
1778 exprNode_undefined, rref,
1780 exprNode_loc (fexp), TT_FCNRETURN);
1785 checkPassstateClauseList (uentry ue, exprNode fexp, sRef fref, int argno)
1787 stateClauseList clauses = uentry_getStateClauseList (ue);
1789 DPRINTF (("Check pass special: %s / %s",
1790 exprNode_unparse (fexp), sRef_unparseFull (fref)));
1792 stateClauseList_preElements (clauses, cl)
1794 if (stateClause_isGlobal (cl))
1800 sRefSet refs = stateClause_getRefs (cl);
1801 sRefTest tst = stateClause_getPreTestFunction (cl);
1802 sRefMod modf = stateClause_getEffectFunction (cl);
1804 sRefSet_elements (refs, el)
1806 sRef base = sRef_getRootBase (el);
1808 if (sRef_isResult (base))
1810 ; /* nothing to check before */
1812 else if (sRef_isParam (base))
1814 if (sRef_getParam (base) == argno - 1)
1818 DPRINTF (("Fix base: %s / %s",
1819 sRef_unparseFull (el),
1820 sRef_unparseFull (fref)));
1822 sb = sRef_fixBase (el, fref);
1824 if (tst != NULL && !(tst(sb)))
1827 (stateClause_preErrorCode (cl),
1828 message ("%s storage %qcorresponds to "
1829 "storage listed in %q clause of "
1830 "called function: %s",
1831 stateClause_preErrorString (cl, sb),
1832 sRef_unparseOpt (sb),
1833 stateClause_unparseKind (cl),
1834 exprNode_unparse (fexp)),
1835 exprNode_loc (fexp));
1840 DPRINTF (("Fixing: %s", sRef_unparseFull (sb)));
1841 modf (sb, exprNode_loc (fexp));
1842 DPRINTF (("==> %s", sRef_unparseFull (sb)));
1850 } end_sRefSet_elements ;
1852 } end_stateClauseList_preElements ;
1854 DPRINTF (("After: %s", sRef_unparseFull (fref)));
1858 ** should not modify arg
1862 transferChecks_passParam (exprNode fexp, uentry arg, bool isSpec,
1863 /*@dependent@*/ exprNode fcn, int argno, int totargs)
1865 sRef tref = uentry_getSref (arg);
1866 sRef fref = exprNode_getSref (fexp);
1868 bool isPartial = FALSE;
1869 bool isImpOut = FALSE;
1870 ctype ct = uentry_getType (arg);
1872 DPRINTF (("Check pass: %s -> %s",
1873 sRef_unparseFull (fref),
1874 sRef_unparseFull (tref)));
1878 atNumArgs = totargs;
1880 if (ctype_isElips (ct))
1885 DPRINTF (("Out arg: %s", bool_unparse (uentry_isOut (arg))));
1887 if (!ctype_isElips (ct) &&
1888 (ctype_isVoidPointer (ct) && uentry_isOut (arg) && sRef_isOnly (tref)))
1890 if (ctype_isRealAP (ct))
1892 if (sRef_aliasCheckSimplePred (sRef_isDead, fref))
1896 message ("Dead storage %qpassed as out parameter to %s: %s",
1897 sRef_unparseOpt (fref),
1898 exprNode_unparse (fcn),
1899 exprNode_unparse (fexp)),
1900 exprNode_loc (fexp)))
1902 if (sRef_isDead (fref))
1904 sRef_showStateInfo (fref);
1908 DPRINTF (("Not really dead!"));
1909 sRef_showStateInfo (fref);
1913 sRef_setAllocated (fref, exprNode_loc (fexp));
1915 else if (context_getFlag (FLG_STRICTUSERELEASED)
1916 && sRef_aliasCheckSimplePred (sRef_isPossiblyDead, fref))
1919 (FLG_USERELEASED, FLG_STRICTUSERELEASED,
1920 message ("Possibly dead storage %qpassed as out parameter: %s",
1921 sRef_unparseOpt (fref),
1922 exprNode_unparse (fexp)),
1923 exprNode_loc (fexp)))
1925 if (sRef_isPossiblyDead (fref))
1927 sRef_showStateInfo (fref);
1931 sRef_setAllocated (fref, exprNode_loc (fexp));
1933 else if (sRef_aliasCheckSimplePred (sRef_isStateUndefined, fref)
1934 || sRef_aliasCheckSimplePred (sRef_isUnuseable, fref))
1938 message ("Unallocated storage %qpassed as out parameter: %s",
1939 sRef_unparseOpt (fref),
1940 exprNode_unparse (fexp)),
1941 exprNode_loc (fexp));
1943 sRef_setAllocated (fref, exprNode_loc (fexp));
1951 (void) checkCompletelyDestroyed (fexp, fref, TRUE, FALSE,
1952 exprNode_loc (fexp), 0, DSC_PARAM, FALSE);
1954 /* make it defined now, so checkTransfer is okay */
1955 sRef_setDefined (fref, exprNode_loc (fexp));
1957 else if (uentry_isOut (arg))
1959 DPRINTF (("Here we are!"));
1961 if (ctype_isRealAP (ct)
1962 && (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref)))
1966 message ("Unallocated storage %qpassed as out parameter to %s: %s",
1967 sRef_unparseOpt (fref),
1968 exprNode_unparse (fcn),
1969 exprNode_unparse (fexp)),
1970 exprNode_loc (fexp));
1971 sRef_setAllocated (fref, exprNode_loc (fexp));
1973 else if (sRef_isDead (fref))
1977 message ("Dead storage %qpassed as out parameter to %s: %s",
1978 sRef_unparseOpt (fref),
1979 exprNode_unparse (fcn),
1980 exprNode_unparse (fexp)),
1981 exprNode_loc (fexp)))
1983 sRef_showStateInfo (fref);
1984 sRef_setAllocated (fref, exprNode_loc (fexp));
1987 else if (sRef_isPossiblyDead (fref))
1990 (FLG_USERELEASED, FLG_STRICTUSERELEASED,
1991 message ("Possibly dead storage %qpassed as out parameter to %s: %s",
1992 sRef_unparseOpt (fref),
1993 exprNode_unparse (fcn),
1994 exprNode_unparse (fexp)),
1995 exprNode_loc (fexp)))
1997 sRef_showStateInfo (fref);
1998 sRef_setAllocated (fref, exprNode_loc (fexp));
2008 else if (uentry_isPartial (arg))
2010 if (ctype_isRealAP (ct)
2011 && (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref)))
2015 message ("Unallocated storage %qpassed as partial parameter: %s",
2016 sRef_unparseOpt (fref),
2017 exprNode_unparse (fexp)),
2018 exprNode_loc (fexp));
2019 sRef_setAllocated (fref, exprNode_loc (fexp));
2021 else if (sRef_isDead (fref))
2025 message ("Dead storage %qpassed as partial parameter to %s: %s",
2026 sRef_unparseOpt (fref),
2027 exprNode_unparse (fcn),
2028 exprNode_unparse (fexp)),
2029 exprNode_loc (fexp)))
2031 sRef_showStateInfo (fref);
2032 sRef_setAllocated (fref, exprNode_loc (fexp));
2035 else if (sRef_isPossiblyDead (fref))
2038 (FLG_USERELEASED, FLG_STRICTUSERELEASED,
2039 message ("Possibly dead storage %qpassed as partial parameter to %s: %s",
2040 sRef_unparseOpt (fref),
2041 exprNode_unparse (fcn),
2042 exprNode_unparse (fexp)),
2043 exprNode_loc (fexp)))
2045 sRef_showStateInfo (fref);
2046 sRef_setAllocated (fref, exprNode_loc (fexp));
2056 else if (uentry_isStateSpecial (arg))
2058 uentry ue = exprNode_getUentry (fcn);
2060 if (ctype_isRealAP (ct)
2061 && (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref)))
2065 message ("Unallocated storage %qpassed as special parameter: %s",
2066 sRef_unparseOpt (fref),
2067 exprNode_unparse (fexp)),
2068 exprNode_loc (fexp));
2069 sRef_setAllocated (fref, exprNode_loc (fexp));
2071 else if (sRef_isDead (fref))
2075 message ("Dead storage %qpassed as special parameter to %s: %s",
2076 sRef_unparseOpt (fref),
2077 exprNode_unparse (fcn),
2078 exprNode_unparse (fexp)),
2079 exprNode_loc (fexp)))
2081 sRef_showStateInfo (fref);
2082 sRef_setAllocated (fref, exprNode_loc (fexp));
2085 else if (sRef_isPossiblyDead (fref))
2088 (FLG_USERELEASED, FLG_STRICTUSERELEASED,
2089 message ("Possibly dead storage %qpassed as special parameter to %s: %s",
2090 sRef_unparseOpt (fref),
2091 exprNode_unparse (fcn),
2092 exprNode_unparse (fexp)),
2093 exprNode_loc (fexp)))
2095 sRef_showStateInfo (fref);
2096 sRef_setAllocated (fref, exprNode_loc (fexp));
2104 if (uentry_hasStateClauseList (ue))
2106 checkPassstateClauseList (ue, fexp, fref, argno);
2111 else if (sRef_isStateDefined (tref))
2113 exprNode_checkUseParam (fexp);
2117 if (isSpec || (!context_getFlag (FLG_IMPOUTS)))
2119 exprNode_checkUseParam (fexp);
2123 if (!sRef_isMacroParamRef (fref)
2124 && (ctype_isRealAP (ct)))
2126 if (sRef_isAddress (fref))
2128 if (sRef_isStateUndefined (fref) || sRef_isUnuseable (fref))
2133 ("Unallocated address %qpassed as implicit "
2134 "out parameter: %s",
2135 sRef_unparseOpt (fref),
2136 exprNode_unparse (fexp)),
2137 exprNode_loc (fexp));
2138 sRef_setAllocated (fref, exprNode_loc (fexp));
2142 /* yes, I really mean this! */
2143 tref = sRef_copy (tref);
2144 sRef_setAllocated (tref, exprNode_loc (fexp));
2151 exprNode_checkUseParam (fexp);
2156 if (sRef_isNew (fref))
2158 alkind tkind = sRef_getAliasKind (tref);
2160 if ((sRef_isFresh (fref) || sRef_isOnly (fref))
2161 && !alkind_isOnly (tkind)
2162 && !alkind_isKeep (tkind)
2163 && !alkind_isOwned (tkind)
2164 && !alkind_isError (tkind)
2165 && !uentry_isReturned (arg))
2170 message ("New fresh storage %q(type %s) passed as %s (not released): %s",
2171 sRef_unparseOpt (fref),
2172 ctype_unparse (sRef_getType (fref)),
2173 alkind_unparse (sRef_getAliasKind (tref)),
2174 exprNode_unparse (fexp)),
2175 exprNode_loc (fexp));
2177 DPRINTF (("Fresh: %s", sRef_unparseFull (fref)));
2181 if (sRef_isNewRef (fref) && !sRef_isKillRef (tref))
2183 alkind ak = sRef_getAliasKind (tref);
2185 if (!alkind_isError (ak))
2189 message ("New reference %q(type %s) passed as %s (not released): %s",
2190 sRef_unparseOpt (fref),
2191 ctype_unparse (sRef_getType (fref)),
2192 alkind_unparse (sRef_getAliasKind (tref)),
2193 exprNode_unparse (fexp)),
2194 exprNode_loc (fexp));
2200 (void) checkTransfer (fexp, exprNode_getSref (fexp),
2201 exprNode_undefined, tref,
2203 exprNode_loc (fexp), TT_FCNPASS);
2206 fref = exprNode_getSref (fexp);
2208 if (isOut && !sRef_isDead (fref) && !sRef_isPossiblyDead (fref))
2212 if (ctype_isRealAP (sRef_getType (fref)))
2214 base = sRef_makePointer (fref);
2223 exprNode_checkMSet (fexp, base);
2227 exprNode_checkSet (fexp, base);
2230 if (sRef_isValid (base))
2234 sRef_clearDerived (base);
2235 sRef_setDefined (base, exprNode_loc (fexp));
2236 usymtab_clearAlias (base);
2237 sRef_setNullUnknown (base, exprNode_loc (fexp));
2243 if (sRef_isValid (fref))
2245 sRef_setPartial (fref, exprNode_loc (fexp));
2249 atFunction = exprNode_undefined;
2253 /* need to fixup here: derived refs could be bogus */
2254 /* (better to change sRef to not add derivs for "protected" ref) */
2256 uentry_fixupSref (arg);
2260 DPRINTF (("Check pass: ==> %s",
2261 sRef_unparseFull (fref)));
2265 transferChecks_globalReturn (uentry glob)
2267 sRef_protectDerivs ();
2268 checkGlobTrans (glob, TT_GLOBRETURN);
2269 sRef_clearProtectDerivs ();
2272 void transferChecks_paramReturn (uentry actual)
2274 checkLeaveTrans (actual, TT_PARAMRETURN);
2277 void transferChecks_loseReference (uentry actual)
2279 checkLeaveTrans (actual, TT_LEAVETRANS);
2283 checkLeaveTrans (uentry actual, transferKind transferType)
2285 sRef aref = uentry_getSref (actual);
2286 sRef origref = uentry_getOrigSref (actual);
2288 if (transferType == TT_PARAMRETURN
2289 && (sRef_isKeep (origref) || sRef_isOnly (origref)
2290 || sRef_isOwned (origref)))
2292 /* caller cannot use, nothing to check */
2296 if (sRef_isNSLocalVar (origref))
2302 DPRINTF (("Leave trans: %s", uentry_unparseFull (actual)));
2304 (void) checkCompletelyDefined (exprNode_undefined, aref, aref,
2305 exprNode_undefined, origref,
2307 g_currentloc, transferType,
2314 checkGlobTrans (uentry glob, transferKind type)
2316 sRef eref = uentry_getOrigSref (glob);
2318 DPRINTF (("Completely defined: %s", uentry_unparseFull (glob)));
2320 (void) checkCompletelyDefined (exprNode_undefined, uentry_getSref (glob),
2321 uentry_getSref (glob),
2322 exprNode_undefined, eref,
2324 g_currentloc, type, 0, TRUE);
2328 ** For lhs of assignment, alias kind is set from basic type.
2333 fixAssignLhs (sRef s)
2335 sRef_resetStateComplete (s);
2338 static void checkStructTransfer (exprNode lhs, sRef slhs, exprNode rhs, sRef srhs,
2342 ctype st = ctype_realType (sRef_getType (srhs));
2344 if (ctype_isSU (st) && ctype_isRealSU (sRef_getType (slhs))
2345 && ctype_match (sRef_getType (slhs), st))
2347 if (tt == TT_DOASSIGN && sRef_isStateDefined (srhs))
2349 sRef_setDefinedComplete (slhs, loc);
2352 if (sRef_isDependent (slhs)
2353 || sRef_isObserver (slhs)
2354 || sRef_isExposed (slhs))
2360 if (sRef_isLocalVar (slhs)
2361 && sRef_isFileOrGlobalScope (sRef_getRootBase (srhs)))
2363 sRef_setDependent (slhs, exprNode_loc (lhs));
2367 if (ctype_isUnion (st))
2369 sRef_setDefState (slhs, sRef_getDefState (srhs),
2370 exprNode_loc (lhs));
2372 sRefSet_realElements (sRef_derivedFields (srhs), sr)
2374 if (sRef_isField (sr))
2376 cstring fieldname = sRef_getField (sr);
2377 sRef lfld = sRef_makeField (slhs, fieldname);
2379 (void) checkTransfer (rhs, sr, lhs, lfld,
2381 exprNode_loc (lhs), tt);
2383 } end_sRefSet_realElements ;
2387 uentryList fields = ctype_getFields (st);
2389 uentryList_elements (fields, field)
2391 sRef rfld = sRef_makeField (srhs, uentry_rawName (field));
2392 sRef lfld = sRef_makeField (slhs, uentry_rawName (field));
2393 (void) checkTransfer (rhs, rfld, lhs, lfld,
2395 exprNode_loc (lhs), tt);
2396 } end_uentryList_elements ;
2399 if (sRef_isOnly (srhs))
2401 sRef_setKeptComplete (srhs, loc);
2409 transferChecks_initialization (exprNode lhs, exprNode rhs)
2411 sRef slhs = exprNode_getSref (lhs);
2413 if (sRef_isFileOrGlobalScope (slhs) || (!sRef_isCvar (slhs)))
2415 (void) checkTransfer (rhs, exprNode_getSref (rhs),
2418 exprNode_loc (rhs), TT_GLOBINIT);
2422 transferChecks_assign (lhs, rhs);
2427 transferChecks_assign (exprNode lhs, exprNode rhs)
2429 sRef slhs = exprNode_getSref (lhs);
2430 sRef srhs = exprNode_getSref (rhs);
2431 sRef base = sRef_getBaseSafe (slhs);
2434 DPRINTF (("Check assign: %s = %s", exprNode_unparse (lhs),
2435 exprNode_unparse (rhs)));
2436 DPRINTF (("lhs: %s", sRef_unparseFull (slhs)));
2437 DPRINTF (("rhs: %s", sRef_unparseFull (srhs)));
2439 if (ctype_isRealSU (sRef_getType (srhs)))
2441 checkStructTransfer (lhs, slhs, rhs, srhs, exprNode_loc (lhs), TT_FIELDASSIGN);
2445 DPRINTF (("lhs: %s", sRef_unparseFull (slhs)));
2446 DPRINTF (("rhs: %s", sRef_unparseFull (srhs)));
2447 (void) checkTransfer (rhs, srhs, lhs, slhs,
2449 exprNode_loc (lhs), TT_DOASSIGN);
2450 DPRINTF (("lhs: %s", sRef_unparseFull (slhs)));
2451 DPRINTF (("rhs: %s", sRef_unparseFull (srhs)));
2454 if (sRef_isConst (srhs) && sRef_isLocalState (srhs))
2456 /* constants can match anything (e.g., NULL) */
2457 sRef_setAliasKind (slhs, AK_ERROR, fileloc_undefined);
2460 if (sRef_isValid (base) && sRef_isStateDefined (base))
2462 sRef_setPdefined (base, g_currentloc);
2465 if (sRef_isPartial (srhs))
2467 sRef_setPartial (slhs, exprNode_loc (rhs));
2470 ns = sRef_getNullState (srhs);
2472 if (nstate_possiblyNull (ns))
2474 if (usymtab_isGuarded (srhs))
2480 sRef_setNullStateInnerComplete (slhs, ns, exprNode_loc (rhs));
2482 if (sRef_isExposed (srhs) || sRef_isObserver (srhs))
2484 sRef_setExKind (slhs, sRef_getExKind (srhs), exprNode_loc (rhs));
2487 DPRINTF (("Done transfer: %s", sRef_unparseFull (slhs)));
2491 checkTransferNullAux (sRef fref, exprNode fexp, /*@unused@*/ bool ffix,
2492 sRef tref, exprNode texp, /*@unused@*/ bool tfix,
2493 fileloc loc, transferKind transferType)
2495 alkind tkind = sRef_getAliasKind (tref);
2496 ctype ttyp = ctype_realType (sRef_getType (tref));
2498 if (ctype_isUnknown (ttyp))
2500 ttyp = exprNode_getType (texp);
2502 if (ctype_isUnknown (ttyp))
2504 ttyp = exprNode_getType (fexp);
2506 if (ctype_isUnknown (ttyp))
2508 ttyp = sRef_getType (fref);
2513 if (ctype_isFunction (ttyp) && (transferType == TT_FCNRETURN))
2515 ttyp = ctype_getReturnType (ttyp);
2519 ** check for null (don't need to check aliases??)
2522 if (sRef_possiblyNull (fref)
2523 && !usymtab_isGuarded (fref)
2524 && ctype_isRealAP (ttyp))
2526 if (!alkind_isLocal (tkind) && !alkind_isFresh (tkind)
2527 && !sRef_perhapsNull (tref)
2528 && !(transferType == TT_DOASSIGN))
2530 if (transferType == TT_GLOBINIT)
2532 if (sRef_isNotNull (tref))
2535 (FLG_SYNTAX, /*@i432 kuldge flag... */
2536 message ("%s %q initialized to %s value: %q",
2537 sRef_getScopeName (tref),
2538 sRef_unparse (tref),
2539 sRef_nullMessage (fref),
2540 generateText (fexp, texp, tref, transferType)),
2543 sRef_showNullInfo (fref);
2544 sRef_setNullError (tref);
2551 message ("%s %q initialized to %s value: %q",
2552 sRef_getScopeName (tref),
2553 sRef_unparse (tref),
2554 sRef_nullMessage (fref),
2555 generateText (fexp, texp, tref, transferType)),
2558 sRef_showNullInfo (fref);
2559 sRef_setNullError (tref);
2566 ((transferType == TT_FCNPASS) ? FLG_NULLPASS : FLG_NULLRET,
2567 message ("%q storage %q%s: %q",
2568 cstring_capitalize (sRef_nullMessage (fref)),
2569 sRef_unparseOpt (fref),
2570 transferNullMessage (transferType),
2571 generateText (fexp, texp, tref, transferType)),
2574 sRef_showNullInfo (fref);
2575 sRef_setNullError (fref);
2588 checkTransferAssignAux (sRef fref, exprNode fexp, /*@unused@*/ bool ffix,
2589 /*@exposed@*/ sRef tref, exprNode texp, bool tfix,
2590 fileloc loc, transferKind transferType)
2592 alkind tkind = sRef_getAliasKind (tref);
2595 ** Assignment to same --- no errors, or state changes.
2596 ** This can happen when returned params are used.
2599 if (sRef_sameName (fref, tref))
2601 sRef_copyState (tref, fref);
2605 if ((alkind_isOnly (tkind) || alkind_isFresh (tkind)
2606 || alkind_isNewRef (tkind) || alkind_isOwned (tkind))
2607 && !(sRef_isDead (tref)
2608 || sRef_isStateUndefined (tref)
2609 || sRef_isUnuseable (tref)
2610 || sRef_isPartial (tref)
2611 || sRef_definitelyNull (tref)
2612 || sRef_isStackAllocated (tref)
2613 || sRef_isAllocIndexRef (tref))
2614 && !(sRef_same (fref, tref)) /* okay to assign to self (returned params) */
2615 && !(usymtab_isDefinitelyNull (tref)))
2617 if (transferChecks_canLoseReference (tref, loc))
2623 flagcode flg = sRef_isFresh (tref) ? FLG_MUSTFREEFRESH : FLG_MUSTFREEONLY;
2625 if (sRef_hasLastReference (tref))
2629 message ("Last reference %q to %s storage %q(type %s) not released "
2630 "before assignment: %q",
2631 sRef_unparse (tref),
2632 alkind_unparse (tkind),
2633 sRef_unparseOpt (sRef_getAliasInfoRef (tref)),
2634 ctype_unparse (sRef_getType (tref)),
2635 generateText (fexp, texp, tref, transferType)),
2638 sRef_showRefLost (tref);
2643 if (context_inGlobalScope ())
2645 /* no errors for static initializations */
2650 ** don't report this error for a[i], since it could
2651 ** be a new element.
2654 if (alkind_isNewRef (tkind))
2659 ("%q %q(type %s) not released before assignment: %q",
2661 (alkind_isKillRef (sRef_getOrigAliasKind (tref))
2662 ? "Kill reference parameter" : "New reference"),
2663 sRef_unparseOpt (tref),
2664 ctype_unparse (sRef_getType (tref)),
2665 generateText (fexp, texp, tref, transferType)),
2668 sRef_showAliasInfo (tref);
2669 sRef_setAliasKind (tref, AK_ERROR, loc);
2673 (!(sRef_isUnknownArrayFetch (tref)
2674 && !context_getFlag (FLG_STRICTDESTROY))
2675 && !sRef_isUnionField (tref)
2676 && !sRef_isRelDef (tref)
2680 ("%s storage %q(type %s) not released before assignment: %q",
2681 alkind_capName (tkind),
2682 sRef_unparseOpt (tref),
2683 ctype_unparse (sRef_getType (tref)),
2684 generateText (fexp, texp, tref, transferType)),
2687 sRef_showAliasInfo (tref);
2698 fixAssignLhs (tref);
2700 if (sRef_isRefCounted (tref)) /* tkind might not be correct now */
2702 if (sRef_isNewRef (fref))
2704 sRef_setAliasKind (tref, AK_NEWREF, loc);
2706 else if (sRef_isConst (fref))
2708 /* for now, constants are not ref counted */
2709 sRef_setAliasKind (tref, AK_ERROR, loc);
2716 if (!sRef_isNSLocalVar (tref)
2717 && sRef_isRefCounted (fref)
2718 && sRef_isStateDefined (fref))
2722 message ("New reference %qto reference counted storage: %q",
2723 sRef_unparseOpt (tref),
2724 generateText (fexp, texp, tref, transferType)),
2730 ** Not for structures and unions, since assignments copy.
2733 if (sRef_isStack (fref)
2734 && !ctype_isSU (ctype_realType (sRef_getType (fref))))
2736 sRef_setAliasKindComplete (tref, AK_STACK, loc);
2739 if (sRef_isNSLocalVar (tref)
2740 && !sRef_isOwned (tref) /*< should only apply to static >*/
2741 && ctype_isMutable (sRef_getType (tref)))
2743 if (sRef_isOnly (fref) && sRef_isNew (fref))
2747 sRef_setFresh (tref, loc);
2754 ** requires sRef_isOnly (fref)
2758 checkOnlyTransferAux (sRef fref, exprNode fexp, bool ffix,
2759 sRef tref, exprNode texp, /*@unused@*/ bool tfix,
2760 fileloc loc, transferKind transferType)
2762 alkind tkind = sRef_getAliasKind (tref);
2764 if (sRef_isExposed (tref) || sRef_isObserver (tref))
2766 if (transferType == TT_FCNRETURN && sRef_isNew (fref)
2767 && !alkind_isError (tkind))
2771 message ("Only storage %q%q (will not be released): %q",
2772 sRef_unparseOpt (fref),
2773 transferErrorMessage (transferType, tkind),
2774 generateText (fexp, texp, tref, transferType)),
2777 sRef_showAliasInfo (fref);
2781 /* no errors for exposed transfers (is this good enough?) */
2783 else if (alkind_isOnly (tkind) || alkind_isKeep (tkind) || alkind_isOwned (tkind))
2787 else if ((transferType == TT_FCNPASS)
2788 && (alkind_isUnknown (tkind)
2789 || alkind_isTemp (tkind) || alkind_isUnique (tkind)))
2791 if (sRef_isFresh (fref)
2792 && alkind_isUnknown (tkind) && !context_getFlag (FLG_PASSUNKNOWN))
2794 if (!ffix) sRef_setAliasKind (fref, AK_UNKNOWN, loc);
2797 else if (alkind_isLocal (tkind)
2798 || alkind_isFresh (tkind) || alkind_isUnknown (tkind))
2800 if ((transferType == TT_DOASSIGN)
2801 && sRef_isNew (fref)
2802 && sRef_isOnly (fref))
2806 if (alkind_isUnknown (tkind)
2807 && sRef_isFileOrGlobalScope (sRef_getRootBase (tref)))
2810 (FLG_ONLYUNQGLOBALTRANS,
2811 message ("Only storage %q%q: %q",
2812 sRef_unparseOpt (fref),
2813 transferErrorMessage (transferType, tkind),
2814 generateText (fexp, texp, tref, transferType)),
2817 sRef_showAliasInfo (fref);
2818 sRef_setAliasKind (tref, AK_ERROR, loc);
2823 if (!error && !ffix)
2825 sRef_setFresh (tref, loc);
2830 if (alkind_isLocal (tkind))
2832 if (sRef_sameName (tref, fref))
2834 ; /* don't set this --- corresponds to return transfer */
2839 ** Don't set local to dependent. Error will
2840 ** be detected through aliasing. Except for
2844 if (!tfix && sRef_isThroughArrayFetch (fref)
2845 && context_getFlag (FLG_DEPARRAYS))
2847 sRef_setDependent (tref, loc);
2855 message ("Only storage %q%q: %q",
2856 sRef_unparseOpt (fref),
2857 transferErrorMessage (transferType, tkind),
2858 generateText (fexp, texp, tref, transferType)),
2861 sRef_showAliasInfo (fref);
2868 if (alkind_isError (tkind)
2869 || (alkind_isUnknown (tkind) && !context_getFlag (FLG_MEMIMPLICIT)))
2871 flagcode_recordSuppressed (FLG_ONLYTRANS);
2875 if ((alkind_isKept (tkind) || alkind_isStack (tkind)
2876 || alkind_isDependent (tkind))
2877 && sRef_isNSLocalVar (tref))
2885 message ("Only storage %q%q: %q",
2886 sRef_unparseOpt (fref),
2887 transferErrorMessage (transferType, tkind),
2888 generateText (fexp, texp, tref, transferType)),
2891 sRef_showAliasInfo (fref);
2893 if (transferType == TT_DOASSIGN)
2896 ** alias kind unknown to suppress future messages
2899 if (!ffix && sRef_isNSLocalVar (sRef_getRootBase (fref)))
2901 sRef_clearAliasKind (fref);
2911 ** ??? same as checkOnly ?
2915 checkOwnedTransferAux (sRef fref, exprNode fexp, bool ffix,
2916 sRef tref, exprNode texp, bool tfix,
2917 fileloc loc, transferKind transferType)
2919 alkind tkind = sRef_getAliasKind (tref);
2921 if (sRef_isExposed (tref) || sRef_isObserver (tref))
2923 if (transferType == TT_FCNRETURN && sRef_isNew (fref))
2927 message ("Owned storage %q%q (will not be released): %q",
2928 sRef_unparseOpt (fref),
2929 transferErrorMessage (transferType, tkind),
2930 generateText (fexp, texp, tref, transferType)),
2933 sRef_showAliasInfo (fref);
2937 else if (alkind_isOnly (tkind) || alkind_isKeep (tkind)
2938 || alkind_isDependent (tkind)
2939 || alkind_isOwned (tkind))
2943 else if (alkind_isLocal (tkind)
2944 || alkind_isFresh (tkind) || alkind_isUnknown (tkind))
2946 if ((transferType == TT_DOASSIGN)
2947 && sRef_isNew (fref) && sRef_isOnly (fref))
2951 sRef_setFresh (tref, loc);
2958 else if ((transferType == TT_FCNPASS)
2959 && (alkind_isUnknown (tkind)
2960 || alkind_isTemp (tkind) || alkind_isUnique (tkind)))
2962 if (sRef_isFresh (fref)
2963 && alkind_isUnknown (tkind) && !context_getFlag (FLG_PASSUNKNOWN))
2965 if (!ffix) { sRef_clearAliasKind (fref); }
2970 if (alkind_isUnknown (tkind) && !context_getFlag (FLG_MEMIMPLICIT))
2972 flagcode_recordSuppressed (FLG_OWNEDTRANS);
2976 if (alkind_isKept (tkind) && sRef_isNSLocalVar (tref))
2984 message ("Owned storage %q%q: %q",
2985 sRef_unparseOpt (fref),
2986 transferErrorMessage (transferType, tkind),
2987 generateText (fexp, texp, tref, transferType)),
2992 if (transferType == TT_DOASSIGN)
2995 ** alias kind unknown to suppress future messages
2998 if (!ffix) { sRef_clearAliasKind (fref); }
3004 checkFreshTransferAux (sRef fref, exprNode fexp, bool ffix,
3005 sRef tref, exprNode texp, /*@unused@*/ bool tfix,
3006 fileloc loc, transferKind transferType)
3008 alkind tkind = sRef_getAliasKind (tref);
3011 ** error to return fresh as non-only
3014 if (transferType == TT_FCNRETURN
3015 && !(alkind_isOnly (tkind) || alkind_isNewRef (tkind)))
3017 if (alkind_isUnknown (tkind) && !context_getFlag (FLG_MEMIMPLICIT))
3019 flagcode_recordSuppressed (FLG_NEWREFTRANS);
3023 if (alkind_isError (tkind))
3027 sRef_killComplete (fref, loc);
3030 else if (alkind_isRefCounted (tkind))
3035 ("New reference returned without newref qualifier: %q",
3036 generateText (fexp, texp, tref, transferType)),
3039 sRef_showAliasInfo (fref);
3040 sRef_killComplete (fref, loc);
3047 message ("Fresh storage %q (should be only): %q",
3048 transferErrorMessage (transferType, tkind),
3049 generateText (fexp, texp, tref, transferType)),
3052 sRef_showAliasInfo (fref);
3053 sRef_killComplete (fref, loc);
3060 ** Okay to assign fresh to only, shared or unqualified.
3062 ** should generate other errors?
3065 if (alkind_isOnly (tkind))
3067 if (transferType == TT_DOASSIGN && !sRef_isFileOrGlobalScope (tref))
3071 if (!sRef_isNSLocalVar (tref))
3073 sRef_setKeptComplete (fref, loc);
3079 if (sRef_isConst (fref))
3087 sRef_killComplete (fref, loc);
3092 else if (alkind_isOwned (tkind))
3096 sRef_setDependentComplete (fref, loc);
3099 else if (alkind_isRefCounted (tkind)
3100 && (transferType == TT_FCNRETURN) && sRef_isFresh (fref))
3104 sRef_killComplete (fref, loc);
3107 else if (alkind_isKeep (tkind))
3111 if (!sRef_isNSLocalVar (tref))
3113 sRef_setKeptComplete (fref, loc);
3117 else if (alkind_isShared (tkind))
3119 if (!ffix) { sRef_setShared (fref, loc); }
3121 else if (alkind_isLocal (tkind) || alkind_isUnknown (tkind))
3123 if (transferType == TT_DOASSIGN || transferType == TT_FCNRETURN)
3126 ** local shares fresh. Make it owned/dependent.
3131 sRef_setOwned (tref, loc);
3136 sRef_setDependentComplete (fref, loc);
3139 /* NO! sRef_clearAliasKind (fref); */
3143 if (context_getFlag (FLG_PASSUNKNOWN))
3145 sRef_clearAliasKind (fref);
3156 checkTransferExposure (sRef fref, exprNode fexp, /*@unused@*/ bool ffix,
3157 sRef tref, exprNode texp, bool tfix,
3159 transferKind transferType)
3161 alkind fkind = sRef_getAliasKind (fref);
3162 alkind tkind = sRef_getAliasKind (tref);
3163 exkind tekind = sRef_getExKind (tref);
3165 if (sRef_isObserver (fref) && ctype_isMutable (sRef_getType (fref)))
3168 ** observer -> exposed or observer
3172 ** observer -> temp is okay [NO! really? only in function calls]
3175 if (sRef_isExposed (tref) || sRef_isObserver (tref)
3176 || alkind_isLocal (tkind))
3180 if ((transferType == TT_DOASSIGN) && alkind_isLocal (tkind))
3184 sRef_setAliasKindComplete (tref, fkind, loc);
3190 if (transferType == TT_FCNRETURN
3191 || transferType == TT_DOASSIGN
3192 || transferType == TT_FIELDASSIGN
3193 || transferType == TT_GLOBINIT)
3195 bool hasError = FALSE;
3197 if (exprNode_isStringLiteral (fexp)
3198 && transferType == TT_GLOBINIT)
3200 hasError = optgenerror
3202 message ("Read-only string literal storage %q%q: %q",
3203 sRef_unparseOpt (fref),
3204 transferErrorExpMessage (transferType, tekind),
3205 generateText (fexp, texp, tref, transferType)),
3208 sRef_setAliasKind (fref, AK_ERROR, fileloc_undefined);
3212 if ((transferType == TT_DOASSIGN
3213 || transferType == TT_FIELDASSIGN)
3214 && (sRef_isNSLocalVar (tref)
3215 || (exprNode_isStringLiteral (fexp)
3216 && ctype_isRealArray (exprNode_getType (texp)))))
3218 ; /* No error for local assignment or assignment
3219 to static array (copies string). */
3223 if (exprNode_isStringLiteral (fexp))
3225 hasError = optgenerror
3228 ("Read-only string literal storage %q%q: %q",
3229 sRef_unparseOpt (fref),
3230 transferErrorExpMessage (transferType, tekind),
3231 generateText (fexp, texp, tref, transferType)),
3238 hasError = optgenerror
3241 ("Observer storage %q%q: %q",
3242 sRef_unparseOpt (fref),
3243 transferErrorExpMessage (transferType, tekind),
3244 generateText (fexp, texp, tref, transferType)),
3252 if (transferType != TT_GLOBINIT)
3254 sRef_showExpInfo (fref);
3255 sRef_setAliasKind (tref, AK_ERROR, loc);
3260 if (transferType == TT_DOASSIGN && !tfix)
3262 DPRINTF (("Setting unknown!"));
3263 /* sRef_setAliasKind (tref, AK_ERROR, loc); */
3267 else /* TT_FCNPASS */
3269 llassert (transferType == TT_FCNPASS);
3271 if (alkind_isTemp (tkind)
3272 || alkind_isDependent (tkind)
3273 || alkind_isRefCounted (tkind))
3279 if (!alkind_isError (tkind))
3283 message ("Observer storage %q%q: %q",
3284 sRef_unparseOpt (fref),
3285 transferErrorMessage (transferType, tkind),
3286 generateText (fexp, texp, tref, transferType)),
3289 sRef_showExpInfo (fref);
3290 sRef_clearAliasState (fref, loc);
3297 else if (sRef_isExposed (fref) && ctype_isMutable (sRef_getType (fref)))
3299 if (transferType == TT_FCNRETURN)
3301 if (!(sRef_isExposed (tref) || sRef_isObserver (tref)
3302 || sRef_isParam (fref)))
3306 message ("Exposed storage %q%q: %q",
3307 sRef_unparseOpt (fref),
3308 transferErrorExpMessage (transferType, tekind),
3309 generateText (fexp, texp, tref, transferType)),
3312 sRef_showExpInfo (fref);
3316 else if (transferType == TT_FCNPASS)
3318 if (!(sRef_isExposed (tref)
3319 || sRef_isObserver (tref)
3320 || (alkind_isUnknown (tkind)
3321 || alkind_isDependent (tkind)
3322 || alkind_isTemp (tkind)
3323 || alkind_isKillRef (tkind)
3324 || alkind_isRefCounted (tkind))))
3326 if (alkind_isUnique (tkind) || alkind_isError (tkind))
3333 message ("Exposed storage %q%q: %q",
3334 sRef_unparseOpt (fref),
3335 transferErrorMessage (transferType, tkind),
3336 generateText (fexp, texp, tref, transferType)),
3339 sRef_showExpInfo (fref);
3340 sRef_clearAliasState (fref, loc);
3350 else if (transferType == TT_DOASSIGN
3351 /* evans 2001-10-05: added TT_FIELDASSIGN: */
3352 || transferType == TT_FIELDASSIGN)
3354 if (!(sRef_isExposed (tref)
3355 || !sRef_isCvar (tref)
3356 || (alkind_isUnknown (tkind)
3357 || alkind_isDependent (tkind)
3358 || alkind_isRefCounted (tkind)
3359 || alkind_isNewRef (tkind)
3360 || alkind_isFresh (tkind)
3361 || alkind_isLocal (tkind))))
3365 message ("Exposed storage %q%q: %q",
3366 sRef_unparseOpt (fref),
3367 transferErrorExpMessage (transferType, tekind),
3368 generateText (fexp, texp, tref, transferType)),
3371 sRef_showExpInfo (fref);
3374 if (!tfix) { sRef_setExposed (tref, loc); }
3378 llassert (transferType == TT_GLOBPASS
3379 || transferType == TT_GLOBRETURN
3380 || transferType == TT_PARAMRETURN
3381 || transferType == TT_LEAVETRANS
3382 || transferType == TT_GLOBINIT);
3392 ** returns TRUE if there is no error reported
3394 ** if fixt, don't change tref (except if error reported.)
3395 ** if fixf, don't change fref (except if error reported.)
3399 checkTransferAux (exprNode fexp, /*@exposed@*/ sRef fref, bool ffix,
3400 exprNode texp, /*@exposed@*/ sRef tref, bool tfix,
3401 fileloc loc, transferKind transferType)
3405 bool isassign = (transferType == TT_DOASSIGN);
3406 bool isfieldassign = (transferType == TT_FIELDASSIGN);
3407 bool iseitherassign = isassign || (transferType == TT_FIELDASSIGN);
3408 bool isfcnpass = (transferType == TT_FCNPASS);
3409 bool isfcnreturn = (transferType == TT_FCNRETURN);
3416 checkTransferNullAux (fref, fexp, ffix, tref, texp, tfix,
3423 checkTransferAssignAux (fref, fexp, ffix, tref, texp, tfix,
3428 ** Check for definition
3432 ** errors passing out params already detected in checkAnyCall
3440 || (!sRef_isNSLocalVar (tref)
3441 && (sRef_isAnyDefined (tref) || !sRef_stateKnown (tref))))
3445 if (!ynm_toBoolRelaxed
3446 (checkCompletelyDefined (fexp, fref, fref,
3449 loc, transferType, 0, TRUE)))
3457 if (defok && iseitherassign)
3459 sRef_setDefState (tref, sRef_getDefState (fref), loc);
3468 checkTransferExposure (fref, fexp, ffix, tref, texp, tfix,
3471 fkind = sRef_getAliasKind (fref);
3472 tkind = sRef_getAliasKind (tref);
3478 if (alkind_isOnly (fkind))
3481 checkOnlyTransferAux (fref, fexp, ffix,
3485 else if (alkind_isFresh (fkind))
3488 checkFreshTransferAux (fref, fexp, ffix,
3492 else if (alkind_isOwned (fkind))
3495 checkOwnedTransferAux (fref, fexp, ffix,
3499 else if (alkind_isDependent (fkind))
3503 (sRef_isExposed (tref) || sRef_isObserver (tref)))
3507 else if ((alkind_isOnly (tkind) || alkind_isKeep (tkind)
3508 || alkind_isOwned (tkind))
3509 || (!isfcnpass && alkind_isTemp (tkind)))
3513 if (sRef_isLocalVar (fref))
3515 sRef depRef = dependentReference (fref);
3517 if (sRef_isValid (depRef) && sRef_isLocalVar (depRef))
3520 sRef_kill (depRef, loc);
3521 sRef_kill (fref, loc);
3531 if (canLoseLocalReference (fref, loc))
3539 (FLG_DEPENDENTTRANS,
3540 message ("%s storage %q%q: %q",
3541 alkind_capName (fkind),
3542 sRef_unparseOpt (fref),
3543 transferErrorMessage (transferType, tkind),
3544 generateText (fexp, texp, tref, transferType)),
3547 DPRINTF (("Here: %s / %s",
3548 sRef_unparseFull (fref),
3549 sRef_unparseFull (tref)));
3551 sRef_showAliasInfo (fref);
3557 if (isassign && (alkind_isFresh (tkind) || alkind_isLocal (tkind)))
3561 sRef_setDependent (tref, loc);
3566 else if (alkind_isShared (fkind))
3573 if (alkind_isOnly (tkind)
3575 && (!(sRef_isObserver (tref) || sRef_isExposed (tref))
3576 && alkind_isTemp (tkind))))
3580 message ("%s storage %q%q: %q",
3581 alkind_capName (fkind),
3582 sRef_unparseOpt (fref),
3583 transferErrorMessage (transferType, tkind),
3584 generateText (fexp, texp, tref, transferType)),
3587 sRef_showAliasInfo (fref);
3592 if (alkind_isFresh (tkind) || alkind_isLocal (tkind))
3594 sRef_setShared (tref, loc);
3598 else if (alkind_isKeep (fkind))
3602 if (alkind_isKeep (tkind)
3603 || alkind_isLocal (tkind)
3604 || (isfcnreturn && sRef_isExposed (tref))
3606 && (alkind_isOnly (tkind) || alkind_isOwned (tkind))))
3608 sRef_setKept (fref, loc);
3611 && (alkind_isTemp (tkind) || alkind_isOwned (tkind)))
3617 if (!alkind_isError (tkind))
3621 message ("%s storage %q: %q",
3622 alkind_capName (fkind),
3623 transferErrorMessage (transferType, tkind),
3624 generateText (fexp, texp, tref, transferType)),
3627 sRef_showAliasInfo (fref);
3632 else if (alkind_isTemp (fkind) || alkind_isKept (fkind))
3638 if (alkind_isOnly (tkind)
3639 || alkind_isShared (tkind)
3640 || (alkind_isTemp (fkind)
3641 && !isfcnreturn && alkind_isDependent (tkind))
3642 || alkind_isOwned (tkind)
3643 || alkind_isKeep (tkind))
3645 if (!exprNode_isNullValue (fexp)
3646 && (ctype_isMutable (exprNode_getType (fexp))
3647 || (ctype_isArray (exprNode_getType (fexp))
3648 && sRef_isParam (fref)))
3649 && (!iseitherassign || sRef_isReference (tref)))
3651 if (sRef_isThroughArrayFetch (fref))
3654 (alkind_isTemp (fkind) ? FLG_TEMPTRANS : FLG_KEPTTRANS,
3655 FLG_STRICTUSERELEASED,
3656 message ("%s storage %q%q: %q",
3657 alkind_capName (fkind),
3658 sRef_unparseOpt (fref),
3659 transferErrorMessage (transferType, tkind),
3660 generateText (fexp, texp, tref, transferType)),
3663 sRef_showAliasInfo (fref);
3669 (alkind_isTemp (fkind) ? FLG_TEMPTRANS : FLG_KEPTTRANS,
3670 message ("%s storage %q%q: %q",
3671 alkind_capName (fkind),
3672 sRef_unparseOpt (fref),
3673 transferErrorMessage (transferType, tkind),
3674 generateText (fexp, texp, tref, transferType)),
3677 sRef_showAliasInfo (fref);
3683 else if (alkind_isRefCounted (fkind) || alkind_isKillRef (fkind))
3685 if (alkind_isNewRef (tkind))
3688 ** check that the refs field has been modified
3691 if (!sRef_isConst (fref))
3695 message ("Reference counted storage returned without modifying "
3696 "reference count: %s",
3697 exprNode_unparse (fexp)),
3701 else if (iseitherassign)
3703 if (alkind_isRefCounted (fkind))
3705 if (!sRef_isLocalVar (tref))
3710 ("Assignment to non-local from reference counted storage: %s",
3711 exprNode_unparse (fexp)),
3713 ("Reference counted storage should call a function returning "
3714 "a newref instead of direct assignments."),
3725 if (alkind_isRefCounted (tkind) || alkind_isTemp (tkind))
3727 /* okay --- no change in state */
3729 else if (alkind_isKillRef (tkind))
3731 if (!ffix && !tfix && !(transferType == TT_FCNRETURN))
3733 sRef_killComplete (fref, loc);
3738 if (!alkind_isError (tkind))
3742 message ("Reference counted storage %q: %q",
3743 transferErrorMessage (transferType, tkind),
3744 generateText (fexp, texp, tref, transferType)),
3757 if (alkind_isOnly (tkind) || alkind_isKeep (tkind))
3759 if (sRef_isAddress (fref))
3762 (FLG_IMMEDIATETRANS,
3763 message ("Immediate address %q %q: %q",
3764 sRef_unparse (fref),
3765 transferErrorMessage (transferType, tkind),
3766 generateText (fexp, texp, tref, transferType)),
3769 sRef_setAliasKind (fref, AK_ERROR, loc);
3773 if ((alkind_isUnknown (fkind) || alkind_isStatic (fkind))
3774 && !sRef_isDefinitelyNull (fref)
3776 && (!exprNode_isNullValue (fexp)))
3778 flagcode errkind = alkind_isStatic (fkind)
3779 ? FLG_STATICTRANS : FLG_UNKNOWNTRANS;
3781 if (transferType == TT_GLOBINIT)
3783 if (errkind == FLG_STATICTRANS)
3785 errkind = FLG_STATICINITTRANS;
3789 errkind = FLG_UNKNOWNINITTRANS;
3795 message ("%s storage %s %q: %q",
3796 alkind_capName (fkind),
3797 exprNode_unparse (fexp),
3798 transferErrorMessage (transferType, tkind),
3799 generateText (fexp, texp, tref, transferType)),
3802 sRef_showAliasInfo (fref);
3807 /* don't kill shared to suppress future messages */
3808 if (!alkind_isShared (fkind))
3814 /*< yuk! should do this in aliasaux >*/
3816 if (!sRef_isNSLocalVar (tref) && !sRef_sameName (fref, tref))
3820 sRef_setKeptComplete (fref, loc);
3824 sRef_setKept (fref, loc);
3835 if (alkind_isKeep (tkind))
3837 sRef_setKeptComplete (fref, loc);
3841 sRef_killComplete (fref, loc);
3846 if (alkind_isKeep (tkind))
3848 sRef_setKept (fref, loc);
3852 sRef_kill (fref, loc);
3859 else if (alkind_isOwned (tkind))
3861 /* don't kill shared to suppress future messages */
3862 if (!alkind_isShared (fkind))
3865 || !sRef_sameName (fref, tref)) /* result of return parameter */
3871 sRef_setDependentComplete (fref, loc);
3875 sRef_setDependent (fref, loc);
3881 else if (alkind_isShared (tkind))
3883 if (alkind_isFresh (fkind) || alkind_isLocal (fkind))
3887 sRef_setShared (fref, loc);
3891 else if (alkind_isUnknown (tkind) && context_getFlag (FLG_MEMIMPLICIT))
3893 if (alkind_isDependent (fkind))
3895 if (!exprNode_isNullValue (fexp)
3896 && ctype_isMutable (exprNode_getType (fexp))
3897 && (!iseitherassign || sRef_isReference (tref)))
3899 if (transferChecks_canLoseReference (fref, loc))
3906 (FLG_DEPENDENTTRANS,
3907 message ("%s storage %q%q: %q",
3908 alkind_capName (fkind),
3909 sRef_unparseOpt (fref),
3910 transferErrorMessage (transferType, tkind),
3911 generateText (fexp, texp, tref, transferType)),
3914 DPRINTF (("Here: %s / %s", sRef_unparseFull (fref),
3915 sRef_unparseFull (tref)));
3916 sRef_showAliasInfo (fref);
3922 else if (alkind_isNewRef (tkind))
3926 sRef_killComplete (fref, loc);
3929 else if (alkind_isKillRef (tkind))
3931 if (transferType == TT_FCNRETURN)
3933 if (sRef_isNewRef (fref))
3937 message ("New reference returned as temp reference: %q",
3938 generateText (fexp, texp, tref, transferType)),
3941 sRef_showAliasInfo (fref);
3947 if (sRef_isNewRef (fref))
3949 sRef_killComplete (fref, loc);
3953 if (sRef_isRefCounted (fref)
3954 && sRef_isCvar (fref)
3955 && !sRef_isLocalVar (fref))
3960 ("External reference counted storage released: %q",
3961 generateText (fexp, texp, tref, transferType)),
3964 sRef_showAliasInfo (fref);
3980 checkMetaStateConsistent (/*@exposed@*/ sRef fref, sRef tref,
3981 fileloc loc, /*@unused@*/ transferKind transferType)
3984 ** Checks if it is consistent to leave storage marked as tref in state of fref.
3987 valueTable fvalues = sRef_getValueTable (fref);
3988 valueTable tvalues = sRef_getValueTable (tref);
3990 DPRINTF (("Metastate consistent: %s => %s",
3991 sRef_unparseFull (fref),
3992 sRef_unparseFull (tref)));
3994 if (valueTable_isUndefined (tvalues) || valueTable_isUndefined (fvalues)) {
3995 /* Cannot check without value tables. An error was already detected. */
3996 DPRINTF (("No value table: %s / %s",
3997 bool_unparse (valueTable_isUndefined (tvalues)),
3998 bool_unparse (valueTable_isUndefined (fvalues))));
4002 valueTable_elements (fvalues, fkey, fval) {
4004 metaStateInfo minfo;
4006 DPRINTF (("Transfer: %s", fkey));
4007 tval = valueTable_lookup (tvalues, fkey);
4008 minfo = context_lookupMetaStateInfo (fkey);
4010 if (!stateValue_isDefined (tval))
4012 if (ctype_isUnknown (sRef_getType (fref)))
4014 ; /* Okay, put in default values without knowing type */
4019 DPRINTF (("Cannot find meta state for: %s / to: %s / %s", sRef_unparseFull (fref),
4020 sRef_unparseFull (tref),
4026 llassert (metaStateInfo_isDefined (minfo));
4028 if (stateValue_isError (fval) || stateValue_isError (tval))
4032 else if (sRef_isDefinitelyNull (fref)
4033 || usymtab_isDefinitelyNull (fref))
4035 ; /* No errors for null values in state transfers. */
4040 stateCombinationTable sctable = metaStateInfo_getTransferTable (minfo);
4041 cstring msg = cstring_undefined;
4042 int nval = stateCombinationTable_lookup (sctable,
4043 stateValue_getValue (fval),
4044 stateValue_getValue (tval),
4047 if (nval == stateValue_error)
4049 if (transferType == TT_LEAVETRANS)
4053 else if (transferType == TT_GLOBRETURN)
4058 ("Function returns with global %q in inconsistent state (%q is %q, should be %q)%q",
4059 sRef_unparse (sRef_getRootBase (fref)),
4060 sRef_unparse (fref),
4061 stateValue_unparseValue (fval, minfo),
4062 stateValue_unparseValue (tval, minfo),
4063 cstring_isDefined (msg)
4064 ? message (": %s", msg) : cstring_undefined),
4067 sRef_showMetaStateInfo (fref, fkey);
4070 else if (transferType == TT_GLOBPASS)
4075 ("Function called with global %q in inconsistent state (%q is %q, should be %q)%q",
4076 sRef_unparse (sRef_getRootBase (fref)),
4077 stateValue_unparseValue (fval, minfo),
4078 sRef_unparse (fref),
4079 stateValue_unparseValue (tval, minfo),
4080 cstring_isDefined (msg)
4081 ? message (": %s", msg) : cstring_undefined),
4084 sRef_showMetaStateInfo (fref, fkey);
4087 else if (transferType == TT_PARAMRETURN)
4092 ("Function returns with parameter %q in inconsistent state (%q is %q, should be %q)%q",
4093 sRef_unparse (sRef_getRootBase (fref)),
4094 sRef_unparse (fref),
4095 stateValue_unparseValue (fval, minfo),
4096 stateValue_unparseValue (tval, minfo),
4097 cstring_isDefined (msg)
4098 ? message (": %s", msg) : cstring_undefined),
4101 sRef_showMetaStateInfo (fref, fkey);
4109 ("Invalid transfer from %q %x to %q (%q)%q",
4110 stateValue_unparseValue (fval, minfo),
4111 sRef_unparse (fref),
4112 stateValue_unparseValue (tval, minfo),
4113 sRef_unparse (tref),
4114 cstring_isDefined (msg)
4115 ? message (": %s", msg) : cstring_undefined),
4118 sRef_showMetaStateInfo (fref, fkey);
4124 if (stateValue_getValue (fval) != nval)
4126 stateValue_updateValueLoc (fval, nval, loc);
4131 DPRINTF (("Transfer: %s %s -> %s",
4132 fkey, stateValue_unparse (fval), stateValue_unparse (tval)));
4133 } end_valueTable_elements ;
4137 checkMetaStateTransfer (exprNode fexp, sRef fref, exprNode texp, sRef tref,
4139 fileloc loc, transferKind /*@i32@*/ transferType)
4141 valueTable fvalues = sRef_getValueTable (fref);
4142 valueTable tvalues = sRef_getValueTable (tref);
4144 DPRINTF (("Metastate transfer: from %s", exprNode_unparse (fexp)));
4146 DPRINTF (("Metastate transfer: %s => %s",
4147 sRef_unparseFull (fref),
4148 sRef_unparseFull (tref)));
4150 if (valueTable_isUndefined (tvalues) || valueTable_isUndefined (fvalues)) {
4151 /* Cannot check without value tables. An error was already detected. */
4152 DPRINTF (("No value table: %s / %s",
4153 bool_unparse (valueTable_isUndefined (tvalues)),
4154 bool_unparse (valueTable_isUndefined (fvalues))));
4158 valueTable_elements (fvalues, fkey, fval) {
4160 metaStateInfo minfo;
4161 stateCombinationTable sctable;
4165 DPRINTF (("Transfer: %s", fkey));
4166 tval = valueTable_lookup (tvalues, fkey);
4167 minfo = context_lookupMetaStateInfo (fkey);
4169 if (!stateValue_isDefined (tval))
4171 if (ctype_isUnknown (sRef_getType (fref)))
4173 ; /* Okay, put in default values without knowing type */
4178 DPRINTF (("Metastate transfer: %s => %s",
4179 exprNode_unparse (fexp), exprNode_unparse (texp)));
4180 DPRINTF (("Cannot find meta state for: %s / to: %s / %s", sRef_unparseFull (fref),
4181 sRef_unparseFull (tref),
4187 llassert (metaStateInfo_isDefined (minfo));
4189 if (stateValue_isError (fval))
4193 else if (stateValue_isError (tval))
4195 if (sRef_isLocalVar (tref) && transferType == TT_DOASSIGN)
4197 /* Local assignments just replace state. */
4198 stateValue_updateValueLoc (tval, stateValue_getValue (fval), loc);
4199 DPRINTF (("Update: %s", stateValue_unparse (tval)));
4201 else if (transferType == TT_FCNRETURN)
4203 ; /* Returning from an unannotated function */
4207 DPRINTF (("Transfer to error: %s / %s", sRef_unparseFull (tref),
4208 transferType_unparse (transferType)));
4213 DPRINTF (("Check: %s / %s / %s / %s", fkey,
4214 metaStateInfo_unparse (minfo),
4215 stateValue_unparse (fval),
4216 stateValue_unparse (tval)));
4218 sctable = metaStateInfo_getTransferTable (minfo);
4219 msg = cstring_undefined;
4221 nval = stateCombinationTable_lookup (sctable,
4222 stateValue_getValue (fval),
4223 stateValue_getValue (tval),
4226 if (transferType == TT_DOASSIGN && sRef_isLocalVar (tref))
4228 /* Local assignments just replace state. */
4229 DPRINTF (("No transfer error assigning to local: %s", msg));
4230 stateValue_updateValueLoc (tval, stateValue_getValue (fval), loc);
4231 DPRINTF (("Update: %s", stateValue_unparse (tval)));
4235 if (nval == stateValue_error)
4237 /*@i32 print extra info for assignments@*/
4242 ("Invalid transfer from %q %x to %q%q: %q",
4243 stateValue_unparseValue (fval, minfo),
4244 sRef_unparse (fref),
4245 stateValue_unparseValue (tval, minfo),
4246 cstring_isDefined (msg)
4247 ? message (" (%s)", msg) : cstring_undefined,
4248 transferErrorExcerpt (transferType, fexp, texp, fcn)),
4251 sRef_showMetaStateInfo (fref, fkey);
4252 sRef_showMetaStateInfo (tref, fkey);
4256 DPRINTF (("Suppressed transfer error: %s", msg));
4261 if (transferType == TT_FCNRETURN)
4264 ** Returning this reference from a function, mark this reference
4265 ** so no lost reference errors are returned.
4268 stateValue_updateValueLoc (fval, stateValue_error, loc);
4270 else if (stateValue_getValue (fval) != nval)
4272 stateValue_updateValueLoc (fval, nval, loc);
4283 DPRINTF (("Transfer: %s %s -> %s",
4284 fkey, stateValue_unparse (fval), stateValue_unparse (tval)));
4285 } end_valueTable_elements ;
4289 ** assigns fexp := tref or passes fexp as a parameter, or returns fexp.
4291 ** For assignments, sets alias and definition state accordingly.
4295 checkTransfer (exprNode fexp, /*@dependent@*/ sRef fref,
4296 exprNode texp, /*@dependent@*/ sRef tref,
4298 fileloc loc, transferKind transferType)
4302 if (context_inProtectVars ())
4307 DPRINTF (("Check transfer: %s => %s",
4308 sRef_unparse (fref),
4309 sRef_unparse (tref)));
4310 DPRINTF (("Check transfer: %s => %s",
4311 exprNode_unparse (fexp),
4312 exprNode_unparse (texp)));
4314 checkMetaStateTransfer (fexp, fref, texp, tref, fcn,
4318 ** for local references, we need to check
4319 ** the transfer for all possible aliases.
4322 if (sRef_isLocalVar (tref) && transferType != TT_DOASSIGN)
4324 sRefSet alias = usymtab_allAliases (tref);
4326 sRefSet_realElements (alias, atref)
4328 sRef abase = sRef_getRootBase (atref);
4330 if (sRef_isKnown (atref)
4331 && !sRef_isLocalVar (abase)
4332 && !sRef_isExternal (abase))
4334 atref = sRef_updateSref (atref);
4336 if (sRef_hasName (atref))
4338 if (!sRef_isNew (atref)
4339 && !sRef_sameName (tref, atref))
4341 context_setAliasAnnote (atref, tref);
4344 checkTransferAux (fexp, fref, TRUE,
4348 context_clearAliasAnnote ();
4351 } end_sRefSet_realElements;
4353 sRefSet_free (alias);
4356 if (sRef_isLocalVar (fref))
4358 sRefSet alias = usymtab_allAliases (fref);
4360 sRefSet_realElements (alias, afref)
4362 sRef abase = sRef_getRootBase (afref);
4364 if (sRef_isKnown (afref)
4365 && !sRef_isLocalVar (abase)
4366 && !sRef_isExternal (abase))
4368 afref = sRef_updateSref (afref);
4370 if (sRef_hasName (afref))
4372 if (!sRef_isNew (afref)
4373 && !sRef_sameName (afref, fref))
4375 context_setAliasAnnote (afref, fref);
4378 checkTransferAux (fexp, afref, FALSE,
4382 context_clearAliasAnnote ();
4385 } end_sRefSet_realElements;
4387 sRefSet_free (alias);
4391 checkTransferAux (fexp, fref, FALSE, texp, tref, FALSE,
4396 static /*@exposed@*/ sRef
4397 dependentReference (sRef sr)
4399 sRefSet ab = usymtab_aliasedBy (sr); /* yes, really mean aliasedBy */
4401 DPRINTF (("Dependent reference: %s", sRef_unparse (sr)));
4402 DPRINTF (("Aliases: %s", sRefSet_unparse (ab)));
4405 ** If there is a local variable that aliases sr, then there is no
4406 ** error. Make the local an only.
4409 if (!sRefSet_isEmpty (ab))
4411 sRef res = sRef_undefined;
4413 DPRINTF (("Here we are!"));
4416 ** make one an only, others alias it
4419 sRefSet_realElements (ab, current)
4421 if (sRef_isOwned (current))
4426 } end_sRefSet_realElements;
4428 if (sRef_isInvalid (res))
4431 ** evans - 2001-03-24
4432 ** No owned element, just choose one!
4433 ** (Any reason for preference?)
4436 res = sRefSet_choose (ab);
4443 return sRef_undefined;
4446 bool transferChecks_canLoseReference (/*@dependent@*/ sRef sr, fileloc loc)
4448 bool gotone = FALSE;
4449 sRefSet ab = usymtab_aliasedBy (sr); /* yes, really mean aliasedBy */
4452 ** if there is a local variable that aliases sr, then there is no
4453 ** error. Make the local an only.
4456 if (!sRefSet_isEmpty (ab))
4459 ** make one an only, others alias it
4462 sRefSet_realElements (ab, current)
4464 sRef_setLastReference (current, sr, loc);
4467 } end_sRefSet_realElements;
4475 bool canLoseLocalReference (/*@dependent@*/ sRef sr, fileloc loc)
4477 bool gotone = FALSE;
4478 sRefSet ab = usymtab_aliasedBy (sr); /* yes, really mean aliasedBy */
4481 ** if there is a local variable that aliases sr, then there is no
4482 ** error. Make the local an only.
4485 if (!sRefSet_isEmpty (ab))
4488 ** make one an only, others alias it
4491 sRefSet_realElements (ab, current)
4493 if (sRef_isRealLocalVar (sRef_getRootBase (current)))
4495 sRef_setLastReference (current, sr, loc);
4499 } end_sRefSet_realElements;