3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
19 =head1 Magical Functions
20 "Magic" is special data attached to SV structures in order to give them
21 "magical" properties. When any Perl code tries to read from, or assign to,
22 an SV marked as magical, it calls the 'get' or 'set' function associated
23 with that SV's magic. A get is called prior to reading an SV, in order to
24 give it a chance to update its internal value (get on $. writes the line
25 number of the last read filehandle into the SV's IV slot), while
26 set is called after an SV has been written to, in order to allow it to make
27 use of its changed value (set on $/ copies the SV's new value to the
28 PL_rs global variable).
30 Magic is implemented as a linked list of MAGIC structures attached to the
31 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
32 of functions that implement the get(), set(), length() etc functions,
33 plus space for some flags and pointers. For example, a tied variable has
34 a MAGIC structure that contains a pointer to the object associated with the
45 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
51 #if defined(HAS_SETGROUPS)
58 # include <sys/pstat.h>
61 #ifdef HAS_PRCTL_SET_NAME
62 # include <sys/prctl.h>
65 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
66 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
68 Signal_t Perl_csighandler(int sig);
72 /* Missing protos on LynxOS */
73 void setruid(uid_t id);
74 void seteuid(uid_t id);
75 void setrgid(uid_t id);
76 void setegid(uid_t id);
80 * Pre-magic setup and post-magic takedown.
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
90 /* MGS is typedef'ed to struct magic_state in perl.h */
93 S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
100 assert(SvMAGICAL(sv));
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
115 mgs = SSPTR(mgs_ix, MGS*);
117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
119 mgs->mgs_bumped = bumped;
121 SvFLAGS(sv) &= ~flags;
125 #define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
128 =for apidoc mg_magical
130 Turns on the magical status of an SV. See C<L</sv_magic>>.
136 Perl_mg_magical(SV *sv)
139 PERL_ARGS_ASSERT_MG_MAGICAL;
142 if ((mg = SvMAGIC(sv))) {
144 const MGVTBL* const vtbl = mg->mg_virtual;
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
162 Do magic before a value is retrieved from the SV. The type of SV must
163 be >= C<SVt_PVMG>. See C<L</sv_magic>>.
169 Perl_mg_get(pTHX_ SV *sv)
171 const I32 mgs_ix = SSNEW(sizeof(MGS));
174 MAGIC *newmg, *head, *cur, *mg;
176 PERL_ARGS_ASSERT_MG_GET;
178 if (PL_localizing == 1 && sv == DEFSV) return 0;
180 /* We must call svt_get(sv, mg) for each valid entry in the linked
181 list of magic. svt_get() may delete the current entry, add new
182 magic to the head of the list, or upgrade the SV. AMS 20010810 */
184 newmg = cur = head = mg = SvMAGIC(sv);
186 const MGVTBL * const vtbl = mg->mg_virtual;
187 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
189 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
191 /* taint's mg get is so dumb it doesn't need flag saving */
192 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
193 save_magic(mgs_ix, sv);
197 vtbl->svt_get(aTHX_ sv, mg);
199 /* guard against magic having been deleted - eg FETCH calling
202 /* recalculate flags */
203 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
207 /* recalculate flags if this entry was deleted. */
208 if (mg->mg_flags & MGf_GSKIP)
209 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
210 ~(SVs_GMG|SVs_SMG|SVs_RMG);
212 else if (vtbl == &PL_vtbl_utf8) {
213 /* get-magic can reallocate the PV */
214 magic_setutf8(sv, mg);
220 /* Have we finished with the new entries we saw? Start again
221 where we left off (unless there are more new entries). */
229 /* Were any new entries added? */
230 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
234 /* recalculate flags */
235 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
240 restore_magic(INT2PTR(void *, (IV)mgs_ix));
248 Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
254 Perl_mg_set(pTHX_ SV *sv)
256 const I32 mgs_ix = SSNEW(sizeof(MGS));
260 PERL_ARGS_ASSERT_MG_SET;
262 if (PL_localizing == 2 && sv == DEFSV) return 0;
264 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
266 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
267 const MGVTBL* vtbl = mg->mg_virtual;
268 nextmg = mg->mg_moremagic; /* it may delete itself */
269 if (mg->mg_flags & MGf_GSKIP) {
270 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
271 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
273 if (PL_localizing == 2
274 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
276 if (vtbl && vtbl->svt_set)
277 vtbl->svt_set(aTHX_ sv, mg);
280 restore_magic(INT2PTR(void*, (IV)mgs_ix));
285 =for apidoc mg_length
287 Reports on the SV's length in bytes, calling length magic if available,
288 but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
289 magic if there is no 'length' magic, but with no indication as to
290 whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
291 higher. Use C<sv_len()> instead.
297 Perl_mg_length(pTHX_ SV *sv)
302 PERL_ARGS_ASSERT_MG_LENGTH;
304 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
305 const MGVTBL * const vtbl = mg->mg_virtual;
306 if (vtbl && vtbl->svt_len) {
307 const I32 mgs_ix = SSNEW(sizeof(MGS));
308 save_magic(mgs_ix, sv);
309 /* omit MGf_GSKIP -- not changed here */
310 len = vtbl->svt_len(aTHX_ sv, mg);
311 restore_magic(INT2PTR(void*, (IV)mgs_ix));
316 (void)SvPV_const(sv, len);
321 Perl_mg_size(pTHX_ SV *sv)
325 PERL_ARGS_ASSERT_MG_SIZE;
327 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
328 const MGVTBL* const vtbl = mg->mg_virtual;
329 if (vtbl && vtbl->svt_len) {
330 const I32 mgs_ix = SSNEW(sizeof(MGS));
332 save_magic(mgs_ix, sv);
333 /* omit MGf_GSKIP -- not changed here */
334 len = vtbl->svt_len(aTHX_ sv, mg);
335 restore_magic(INT2PTR(void*, (IV)mgs_ix));
342 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
346 Perl_croak(aTHX_ "Size magic not implemented");
349 NOT_REACHED; /* NOTREACHED */
355 Clear something magical that the SV represents. See C<L</sv_magic>>.
361 Perl_mg_clear(pTHX_ SV *sv)
363 const I32 mgs_ix = SSNEW(sizeof(MGS));
367 PERL_ARGS_ASSERT_MG_CLEAR;
369 save_magic(mgs_ix, sv);
371 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
372 const MGVTBL* const vtbl = mg->mg_virtual;
373 /* omit GSKIP -- never set here */
375 nextmg = mg->mg_moremagic; /* it may delete itself */
377 if (vtbl && vtbl->svt_clear)
378 vtbl->svt_clear(aTHX_ sv, mg);
381 restore_magic(INT2PTR(void*, (IV)mgs_ix));
386 S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
393 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
394 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
406 Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
412 Perl_mg_find(const SV *sv, int type)
414 return S_mg_findext_flags(sv, type, NULL, 0);
418 =for apidoc mg_findext
420 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
427 Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
429 return S_mg_findext_flags(sv, type, vtbl, 1);
433 Perl_mg_find_mglob(pTHX_ SV *sv)
435 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
436 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
437 /* This sv is only a delegate. //g magic must be attached to
442 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
443 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
450 Copies the magic from one SV to another. See C<L</sv_magic>>.
456 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
461 PERL_ARGS_ASSERT_MG_COPY;
463 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
464 const MGVTBL* const vtbl = mg->mg_virtual;
465 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
466 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
469 const char type = mg->mg_type;
470 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
472 (type == PERL_MAGIC_tied)
475 toLOWER(type), key, klen);
484 =for apidoc mg_localize
486 Copy some of the magic from an existing SV to new localized version of that
487 SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
488 gets copied, value magic doesn't (I<e.g.>,
491 If C<setmagic> is false then no set magic will be called on the new (empty) SV.
492 This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
493 and that will handle the magic.
499 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
503 PERL_ARGS_ASSERT_MG_LOCALIZE;
508 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
509 const MGVTBL* const vtbl = mg->mg_virtual;
510 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
513 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
514 (void)vtbl->svt_local(aTHX_ nsv, mg);
516 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
517 mg->mg_ptr, mg->mg_len);
519 /* container types should remain read-only across localization */
520 SvFLAGS(nsv) |= SvREADONLY(sv);
523 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
524 SvFLAGS(nsv) |= SvMAGICAL(sv);
533 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
535 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
537 const MGVTBL* const vtbl = mg->mg_virtual;
538 if (vtbl && vtbl->svt_free)
539 vtbl->svt_free(aTHX_ sv, mg);
540 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
541 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
542 Safefree(mg->mg_ptr);
543 else if (mg->mg_len == HEf_SVKEY)
544 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
546 if (mg->mg_flags & MGf_REFCOUNTED)
547 SvREFCNT_dec(mg->mg_obj);
554 Free any magic storage used by the SV. See C<L</sv_magic>>.
560 Perl_mg_free(pTHX_ SV *sv)
565 PERL_ARGS_ASSERT_MG_FREE;
567 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
568 moremagic = mg->mg_moremagic;
569 mg_free_struct(sv, mg);
570 SvMAGIC_set(sv, moremagic);
572 SvMAGIC_set(sv, NULL);
578 =for apidoc Am|void|mg_free_type|SV *sv|int how
580 Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
586 Perl_mg_free_type(pTHX_ SV *sv, int how)
588 MAGIC *mg, *prevmg, *moremg;
589 PERL_ARGS_ASSERT_MG_FREE_TYPE;
590 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
592 moremg = mg->mg_moremagic;
593 if (mg->mg_type == how) {
594 /* temporarily move to the head of the magic chain, in case
595 custom free code relies on this historical aspect of mg_free */
597 prevmg->mg_moremagic = moremg;
598 mg->mg_moremagic = SvMAGIC(sv);
601 newhead = mg->mg_moremagic;
602 mg_free_struct(sv, mg);
603 SvMAGIC_set(sv, newhead);
613 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
617 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
620 REGEXP * const rx = PM_GETRE(PL_curpm);
622 UV uv= (UV)mg->mg_obj;
623 if (uv == '+') { /* @+ */
624 /* return the number possible */
625 return RX_NPARENS(rx);
626 } else { /* @- @^CAPTURE @{^CAPTURE} */
627 I32 paren = RX_LASTPAREN(rx);
629 /* return the last filled */
631 && (RX_OFFS(rx)[paren].start == -1
632 || RX_OFFS(rx)[paren].end == -1) )
638 /* @^CAPTURE @{^CAPTURE} */
639 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
651 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
653 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
656 REGEXP * const rx = PM_GETRE(PL_curpm);
658 const UV uv= (UV)mg->mg_obj;
659 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
660 const I32 paren = mg->mg_len
661 + (uv == '\003' ? 1 : 0);
666 if (paren <= (I32)RX_NPARENS(rx) &&
667 (s = RX_OFFS(rx)[paren].start) != -1 &&
668 (t = RX_OFFS(rx)[paren].end) != -1)
672 if (uv == '+') /* @+ */
674 else if (uv == '-') /* @- */
676 else { /* @^CAPTURE @{^CAPTURE} */
677 CALLREG_NUMBUF_FETCH(rx,paren,sv);
681 if (RX_MATCH_UTF8(rx)) {
682 const char * const b = RX_SUBBEG(rx);
684 i = RX_SUBCOFFSET(rx) +
686 (U8*)(b-RX_SUBOFFSET(rx)+i));
701 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
703 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
707 Perl_croak_no_modify();
708 NORETURN_FUNCTION_END;
711 #define SvRTRIM(sv) STMT_START { \
713 STRLEN len = SvCUR(sv); \
714 char * const p = SvPVX(sv); \
715 while (len > 0 && isSPACE(p[len-1])) \
717 SvCUR_set(sv, len); \
723 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
725 PERL_ARGS_ASSERT_EMULATE_COP_IO;
727 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
728 sv_setsv(sv, &PL_sv_undef);
732 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
733 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
738 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
739 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
747 S_fixup_errno_string(pTHX_ SV* sv)
749 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
752 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
756 if(strEQ(SvPVX(sv), "")) {
757 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
761 /* In some locales the error string may come back as UTF-8, in which
762 * case we should turn on that flag. This didn't use to happen, and to
763 * avoid as many possible backward compatibility issues as possible, we
764 * don't turn on the flag unless we have to. So the flag stays off for
765 * an entirely invariant string. We assume that if the string looks
766 * like UTF-8, it really is UTF-8: "text in any other encoding that
767 * uses bytes with the high bit set is extremely unlikely to pass a
768 * UTF-8 validity test"
769 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
770 * potential that we will get it wrong however, especially on short
771 * error message text. (If it turns out to be necessary, we could also
772 * keep track if the current LC_MESSAGES locale is UTF-8) */
773 if (! IN_BYTES /* respect 'use bytes' */
774 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
775 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
788 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
791 const char *s = NULL;
793 const char * const remaining = mg->mg_ptr + 1;
796 PERL_ARGS_ASSERT_MAGIC_GET;
800 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
802 CALLREG_NUMBUF_FETCH(rx,paren,sv);
804 sv_setsv(sv,&PL_sv_undef);
809 nextchar = *remaining;
810 switch (*mg->mg_ptr) {
811 case '\001': /* ^A */
812 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
813 else sv_setsv(sv, &PL_sv_undef);
814 if (SvTAINTED(PL_bodytarget))
817 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
818 if (nextchar == '\0') {
819 sv_setiv(sv, (IV)PL_minus_c);
821 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
822 sv_setiv(sv, (IV)STATUS_NATIVE);
826 case '\004': /* ^D */
827 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
829 case '\005': /* ^E */
830 if (nextchar != '\0') {
831 if (strEQ(remaining, "NCODING"))
836 #if defined(VMS) || defined(OS2) || defined(WIN32)
840 $DESCRIPTOR(msgdsc,msg);
841 sv_setnv(sv,(NV) vaxc$errno);
842 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
843 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
848 if (!(_emx_env & 0x200)) { /* Under DOS */
849 sv_setnv(sv, (NV)errno);
850 sv_setpv(sv, errno ? my_strerror(errno) : "");
852 if (errno != errno_isOS2) {
853 const int tmp = _syserrno();
854 if (tmp) /* 2nd call to _syserrno() makes it 0 */
857 sv_setnv(sv, (NV)Perl_rc);
858 sv_setpv(sv, os2error(Perl_rc));
860 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
861 fixup_errno_string(sv);
863 # elif defined(WIN32)
865 const DWORD dwErr = GetLastError();
866 sv_setnv(sv, (NV)dwErr);
868 PerlProc_GetOSError(sv, dwErr);
869 fixup_errno_string(sv);
876 # error Missing code for platform
879 SvNOK_on(sv); /* what a wonderful hack! */
881 #endif /* End of platforms with special handling for $^E; others just fall
888 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
890 sv_setnv(sv, (NV)errno);
893 if (errno == errno_isOS2 || errno == errno_isOS2_set)
894 sv_setpv(sv, os2error(Perl_rc));
902 /* Strerror can return NULL on some platforms, which will
903 * result in 'sv' not being considered SvOK. The SvNOK_on()
904 * below will cause just the number part to be valid */
905 sv_setpv(sv, my_strerror(errno));
907 fixup_errno_string(sv);
914 SvNOK_on(sv); /* what a wonderful hack! */
917 case '\006': /* ^F */
918 sv_setiv(sv, (IV)PL_maxsysfd);
920 case '\007': /* ^GLOBAL_PHASE */
921 if (strEQ(remaining, "LOBAL_PHASE")) {
922 sv_setpvn(sv, PL_phase_names[PL_phase],
923 strlen(PL_phase_names[PL_phase]));
926 case '\010': /* ^H */
927 sv_setiv(sv, (IV)PL_hints);
929 case '\011': /* ^I */ /* NOT \t in EBCDIC */
930 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
932 case '\014': /* ^LAST_FH */
933 if (strEQ(remaining, "AST_FH")) {
935 assert(isGV_with_GP(PL_last_in_gv));
936 SV_CHECK_THINKFIRST_COW_DROP(sv);
937 prepare_SV_for_RV(sv);
939 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
943 else sv_setsv_nomg(sv, NULL);
946 case '\017': /* ^O & ^OPEN */
947 if (nextchar == '\0') {
948 sv_setpv(sv, PL_osname);
951 else if (strEQ(remaining, "PEN")) {
952 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
956 sv_setiv(sv, (IV)PL_perldb);
958 case '\023': /* ^S */
960 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
963 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
968 case '\024': /* ^T */
969 if (nextchar == '\0') {
971 sv_setnv(sv, PL_basetime);
973 sv_setiv(sv, (IV)PL_basetime);
976 else if (strEQ(remaining, "AINT"))
977 sv_setiv(sv, TAINTING_get
978 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
981 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
982 if (strEQ(remaining, "NICODE"))
983 sv_setuv(sv, (UV) PL_unicode);
984 else if (strEQ(remaining, "TF8LOCALE"))
985 sv_setuv(sv, (UV) PL_utf8locale);
986 else if (strEQ(remaining, "TF8CACHE"))
987 sv_setiv(sv, (IV) PL_utf8cache);
989 case '\027': /* ^W & $^WARNING_BITS */
990 if (nextchar == '\0')
991 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
992 else if (strEQ(remaining, "ARNING_BITS")) {
993 if (PL_compiling.cop_warnings == pWARN_NONE) {
994 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
996 else if (PL_compiling.cop_warnings == pWARN_STD) {
997 sv_setsv(sv, &PL_sv_undef);
1000 else if (PL_compiling.cop_warnings == pWARN_ALL) {
1001 /* Get the bit mask for $warnings::Bits{all}, because
1002 * it could have been extended by warnings::register */
1003 HV * const bits = get_hv("warnings::Bits", 0);
1004 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1006 sv_copypv(sv, *bits_all);
1008 sv_setpvn(sv, WARN_ALLstring, WARNsize);
1011 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1012 *PL_compiling.cop_warnings);
1016 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1017 sv_setiv(sv, w32_sloppystat);
1022 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1023 paren = RX_LASTPAREN(rx);
1025 goto do_numbuf_fetch;
1027 sv_setsv(sv,&PL_sv_undef);
1029 case '\016': /* ^N */
1030 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1031 paren = RX_LASTCLOSEPAREN(rx);
1033 goto do_numbuf_fetch;
1035 sv_setsv(sv,&PL_sv_undef);
1038 if (GvIO(PL_last_in_gv)) {
1039 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1044 sv_setiv(sv, (IV)STATUS_CURRENT);
1045 #ifdef COMPLEX_STATUS
1046 SvUPGRADE(sv, SVt_PVLV);
1047 LvTARGOFF(sv) = PL_statusvalue;
1048 LvTARGLEN(sv) = PL_statusvalue_vms;
1053 if (GvIOp(PL_defoutgv))
1054 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1058 sv_setpv(sv,GvENAME(PL_defoutgv));
1059 sv_catpvs(sv,"_TOP");
1063 if (GvIOp(PL_defoutgv))
1064 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1066 s = GvENAME(PL_defoutgv);
1070 if (GvIO(PL_defoutgv))
1071 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1074 if (GvIO(PL_defoutgv))
1075 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1078 if (GvIO(PL_defoutgv))
1079 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1088 if (GvIO(PL_defoutgv))
1089 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1093 sv_copypv(sv, PL_ors_sv);
1095 sv_setsv(sv, &PL_sv_undef);
1099 IV const pid = (IV)PerlProc_getpid();
1100 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1101 /* never set manually, or at least not since last fork */
1103 /* never unsafe, even if reading in a tainted expression */
1106 /* else a value has been assigned manually, so do nothing */
1110 sv_setuid(sv, PerlProc_getuid());
1113 sv_setuid(sv, PerlProc_geteuid());
1116 sv_setgid(sv, PerlProc_getgid());
1119 sv_setgid(sv, PerlProc_getegid());
1121 #ifdef HAS_GETGROUPS
1123 Groups_t *gary = NULL;
1125 I32 num_groups = getgroups(0, gary);
1126 if (num_groups > 0) {
1127 Newx(gary, num_groups, Groups_t);
1128 num_groups = getgroups(num_groups, gary);
1129 for (i = 0; i < num_groups; i++)
1130 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1134 (void)SvIOK_on(sv); /* what a wonderful hack! */
1144 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1146 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1148 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1150 if (uf && uf->uf_val)
1151 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1156 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1158 STRLEN len = 0, klen;
1159 const char * const key = MgPV_const(mg,klen);
1162 PERL_ARGS_ASSERT_MAGIC_SETENV;
1166 /* defined environment variables are byte strings; unfortunately
1167 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1168 (void)SvPV_force_nomg_nolen(sv);
1169 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1171 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1177 my_setenv(key, s); /* does the deed */
1179 #ifdef DYNAMIC_ENV_FETCH
1180 /* We just undefd an environment var. Is a replacement */
1181 /* waiting in the wings? */
1183 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1185 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1189 #if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
1190 /* And you'll never guess what the dog had */
1191 /* in its mouth... */
1193 MgTAINTEDDIR_off(mg);
1195 if (s && memEQs(key, klen, "DCL$PATH")) {
1196 char pathbuf[256], eltbuf[256], *cp, *elt;
1199 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1201 do { /* DCL$PATH may be a search list */
1202 while (1) { /* as may dev portion of any element */
1203 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1204 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1205 cando_by_name(S_IWUSR,0,elt) ) {
1206 MgTAINTEDDIR_on(mg);
1210 if ((cp = strchr(elt, ':')) != NULL)
1212 if (my_trnlnm(elt, eltbuf, j++))
1218 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1221 if (s && memEQs(key, klen, "PATH")) {
1222 const char * const strend = s + len;
1224 /* set MGf_TAINTEDDIR if any component of the new path is
1225 * relative or world-writeable */
1226 while (s < strend) {
1230 #ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1231 const char path_sep = PL_perllib_sep;
1233 const char path_sep = ':';
1235 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
1236 s, strend, path_sep, &i);
1238 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1240 /* no colon thus no device name -- assume relative path */
1241 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1242 /* Using Unix separator, e.g. under bash, so act line Unix */
1243 || (PL_perllib_sep == ':' && *tmpbuf != '/')
1245 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1247 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1248 MgTAINTEDDIR_on(mg);
1254 #endif /* neither OS2 nor WIN32 nor MSDOS */
1260 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1262 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1263 PERL_UNUSED_ARG(sv);
1264 my_setenv(MgPV_nolen_const(mg),NULL);
1269 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1271 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1272 PERL_UNUSED_ARG(mg);
1274 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1276 if (PL_localizing) {
1279 hv_iterinit(MUTABLE_HV(sv));
1280 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1282 my_setenv(hv_iterkey(entry, &keylen),
1283 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1291 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1293 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1294 PERL_UNUSED_ARG(sv);
1295 PERL_UNUSED_ARG(mg);
1297 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1305 #ifdef HAS_SIGPROCMASK
1307 restore_sigmask(pTHX_ SV *save_sv)
1309 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1310 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1314 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1316 /* Are we fetching a signal entry? */
1317 int i = (I16)mg->mg_private;
1319 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1323 const char * sig = MgPV_const(mg, siglen);
1324 mg->mg_private = i = whichsig_pvn(sig, siglen);
1329 sv_setsv(sv,PL_psig_ptr[i]);
1331 Sighandler_t sigstate = rsignal_state(i);
1332 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1333 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1336 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1337 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1340 /* cache state so we don't fetch it again */
1341 if(sigstate == (Sighandler_t) SIG_IGN)
1342 sv_setpvs(sv,"IGNORE");
1344 sv_setsv(sv,&PL_sv_undef);
1345 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1352 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1354 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1356 magic_setsig(NULL, mg);
1357 return sv_unmagic(sv, mg->mg_type);
1361 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1362 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1364 Perl_csighandler(int sig)
1367 #ifdef PERL_GET_SIG_CONTEXT
1368 dTHXa(PERL_GET_SIG_CONTEXT);
1372 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1373 #if defined(__cplusplus) && defined(__GNUC__)
1374 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1375 * parameters would be warned about. */
1376 PERL_UNUSED_ARG(sip);
1377 PERL_UNUSED_ARG(uap);
1380 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1381 (void) rsignal(sig, PL_csighandlerp);
1382 if (PL_sig_ignoring[sig]) return;
1384 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1385 if (PL_sig_defaulting[sig])
1386 #ifdef KILL_BY_SIGPRC
1387 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1402 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1403 /* Call the perl level handler now--
1404 * with risk we may be in malloc() or being destructed etc. */
1405 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1406 (*PL_sighandlerp)(sig, NULL, NULL);
1408 (*PL_sighandlerp)(sig);
1411 if (!PL_psig_pend) return;
1412 /* Set a flag to say this signal is pending, that is awaiting delivery after
1413 * the current Perl opcode completes */
1414 PL_psig_pend[sig]++;
1416 #ifndef SIG_PENDING_DIE_COUNT
1417 # define SIG_PENDING_DIE_COUNT 120
1419 /* Add one to say _a_ signal is pending */
1420 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1421 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1422 (unsigned long)SIG_PENDING_DIE_COUNT);
1426 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1428 Perl_csighandler_init(void)
1431 if (PL_sig_handlers_initted) return;
1433 for (sig = 1; sig < SIG_SIZE; sig++) {
1434 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1436 PL_sig_defaulting[sig] = 1;
1437 (void) rsignal(sig, PL_csighandlerp);
1439 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1440 PL_sig_ignoring[sig] = 0;
1443 PL_sig_handlers_initted = 1;
1447 #if defined HAS_SIGPROCMASK
1449 unblock_sigmask(pTHX_ void* newset)
1451 PERL_UNUSED_CONTEXT;
1452 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1457 Perl_despatch_signals(pTHX)
1461 for (sig = 1; sig < SIG_SIZE; sig++) {
1462 if (PL_psig_pend[sig]) {
1464 #ifdef HAS_SIGPROCMASK
1465 /* From sigaction(2) (FreeBSD man page):
1466 * | Signal routines normally execute with the signal that
1467 * | caused their invocation blocked, but other signals may
1469 * Emulation of this behavior (from within Perl) is enabled
1473 sigset_t newset, oldset;
1475 sigemptyset(&newset);
1476 sigaddset(&newset, sig);
1477 sigprocmask(SIG_BLOCK, &newset, &oldset);
1478 was_blocked = sigismember(&oldset, sig);
1480 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1482 SAVEFREESV(save_sv);
1483 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1486 PL_psig_pend[sig] = 0;
1487 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1488 (*PL_sighandlerp)(sig, NULL, NULL);
1490 (*PL_sighandlerp)(sig);
1492 #ifdef HAS_SIGPROCMASK
1501 /* sv of NULL signifies that we're acting as magic_clearsig. */
1503 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1508 /* Need to be careful with SvREFCNT_dec(), because that can have side
1509 * effects (due to closures). We must make sure that the new disposition
1510 * is in place before it is called.
1514 #ifdef HAS_SIGPROCMASK
1518 const char *s = MgPV_const(mg,len);
1520 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1523 if (memEQs(s, len, "__DIE__"))
1525 else if (memEQs(s, len, "__WARN__")
1526 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1527 /* Merge the existing behaviours, which are as follows:
1528 magic_setsig, we always set svp to &PL_warnhook
1529 (hence we always change the warnings handler)
1530 For magic_clearsig, we don't change the warnings handler if it's
1531 set to the &PL_warnhook. */
1534 SV *tmp = sv_newmortal();
1535 Perl_croak(aTHX_ "No such hook: %s",
1536 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1540 if (*svp != PERL_WARNHOOK_FATAL)
1546 i = (I16)mg->mg_private;
1548 i = whichsig_pvn(s, len); /* ...no, a brick */
1549 mg->mg_private = (U16)i;
1553 SV *tmp = sv_newmortal();
1554 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1555 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1559 #ifdef HAS_SIGPROCMASK
1560 /* Avoid having the signal arrive at a bad time, if possible. */
1563 sigprocmask(SIG_BLOCK, &set, &save);
1565 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1566 SAVEFREESV(save_sv);
1567 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1570 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1571 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1573 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1574 PL_sig_ignoring[i] = 0;
1576 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1577 PL_sig_defaulting[i] = 0;
1579 to_dec = PL_psig_ptr[i];
1581 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1582 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1584 /* Signals don't change name during the program's execution, so once
1585 they're cached in the appropriate slot of PL_psig_name, they can
1588 Ideally we'd find some way of making SVs at (C) compile time, or
1589 at least, doing most of the work. */
1590 if (!PL_psig_name[i]) {
1591 PL_psig_name[i] = newSVpvn(s, len);
1592 SvREADONLY_on(PL_psig_name[i]);
1595 SvREFCNT_dec(PL_psig_name[i]);
1596 PL_psig_name[i] = NULL;
1597 PL_psig_ptr[i] = NULL;
1600 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1602 (void)rsignal(i, PL_csighandlerp);
1605 *svp = SvREFCNT_inc_simple_NN(sv);
1607 if (sv && SvOK(sv)) {
1608 s = SvPV_force(sv, len);
1612 if (sv && memEQs(s, len,"IGNORE")) {
1614 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1615 PL_sig_ignoring[i] = 1;
1616 (void)rsignal(i, PL_csighandlerp);
1618 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1622 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1624 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1625 PL_sig_defaulting[i] = 1;
1626 (void)rsignal(i, PL_csighandlerp);
1628 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1634 * We should warn if HINT_STRICT_REFS, but without
1635 * access to a known hint bit in a known OP, we can't
1636 * tell whether HINT_STRICT_REFS is in force or not.
1638 if (!strchr(s,':') && !strchr(s,'\''))
1639 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1642 (void)rsignal(i, PL_csighandlerp);
1644 *svp = SvREFCNT_inc_simple_NN(sv);
1648 #ifdef HAS_SIGPROCMASK
1652 SvREFCNT_dec(to_dec);
1655 #endif /* !PERL_MICRO */
1658 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1660 PERL_ARGS_ASSERT_MAGIC_SETISA;
1661 PERL_UNUSED_ARG(sv);
1663 /* Skip _isaelem because _isa will handle it shortly */
1664 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1667 return magic_clearisa(NULL, mg);
1670 /* sv of NULL signifies that we're acting as magic_setisa. */
1672 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1675 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1677 /* Bail out if destruction is going on */
1678 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1681 av_clear(MUTABLE_AV(sv));
1683 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1684 /* This occurs with setisa_elem magic, which calls this
1686 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1689 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1690 SV **svp = AvARRAY((AV *)mg->mg_obj);
1691 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1693 stash = GvSTASH((GV *)*svp++);
1694 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1701 (const GV *)mg->mg_obj
1704 /* The stash may have been detached from the symbol table, so check its
1705 name before doing anything. */
1706 if (stash && HvENAME_get(stash))
1707 mro_isa_changed_in(stash);
1713 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1715 HV * const hv = MUTABLE_HV(LvTARG(sv));
1718 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1719 PERL_UNUSED_ARG(mg);
1722 (void) hv_iterinit(hv);
1723 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1726 while (hv_iternext(hv))
1731 sv_setiv(sv, (IV)i);
1736 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1738 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1739 PERL_UNUSED_ARG(mg);
1741 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1747 =for apidoc magic_methcall
1749 Invoke a magic method (like FETCH).
1751 C<sv> and C<mg> are the tied thingy and the tie magic.
1753 C<meth> is the name of the method to call.
1755 C<argc> is the number of args (in addition to $self) to pass to the method.
1757 The C<flags> can be:
1759 G_DISCARD invoke method with G_DISCARD flag and don't
1761 G_UNDEF_FILL fill the stack with argc pointers to
1764 The arguments themselves are any values following the C<flags> argument.
1766 Returns the SV (if any) returned by the method, or C<NULL> on failure.
1773 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1779 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1783 if (flags & G_WRITING_TO_STDERR) {
1787 SAVESPTR(PL_stderrgv);
1791 PUSHSTACKi(PERLSI_MAGIC);
1794 /* EXTEND() expects a signed argc; don't wrap when casting */
1795 assert(argc <= I32_MAX);
1796 EXTEND(SP, (I32)argc+1);
1797 PUSHs(SvTIED_obj(sv, mg));
1798 if (flags & G_UNDEF_FILL) {
1800 PUSHs(&PL_sv_undef);
1802 } else if (argc > 0) {
1804 va_start(args, argc);
1807 SV *const sv = va_arg(args, SV *);
1814 if (flags & G_DISCARD) {
1815 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1818 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1819 ret = *PL_stack_sp--;
1822 if (flags & G_WRITING_TO_STDERR)
1828 /* wrapper for magic_methcall that creates the first arg */
1831 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1836 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1839 if (mg->mg_len >= 0) {
1840 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1842 else if (mg->mg_len == HEf_SVKEY)
1843 arg1 = MUTABLE_SV(mg->mg_ptr);
1845 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1846 arg1 = newSViv((IV)(mg->mg_len));
1850 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1852 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1856 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
1860 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1862 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1869 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1871 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1873 if (mg->mg_type == PERL_MAGIC_tiedelem)
1874 mg->mg_flags |= MGf_GSKIP;
1875 magic_methpack(sv,mg,SV_CONST(FETCH));
1880 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1885 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1887 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1888 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1889 * public flags indicate its value based on copying from $val. Doing
1890 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1891 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1892 * wrong if $val happened to be tainted, as sv hasn't got magic
1893 * enabled, even though taint magic is in the chain. In which case,
1894 * fake up a temporary tainted value (this is easier than temporarily
1895 * re-enabling magic on sv). */
1897 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
1898 && (tmg->mg_len & 1))
1900 val = sv_mortalcopy(sv);
1906 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
1911 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1913 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1915 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1916 return magic_methpack(sv,mg,SV_CONST(DELETE));
1921 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1926 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1928 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
1930 retval = SvIV(retsv)-1;
1932 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1934 return (U32) retval;
1938 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1940 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1942 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
1947 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1951 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1953 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1954 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
1961 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1963 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1965 return magic_methpack(sv,mg,SV_CONST(EXISTS));
1969 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1972 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1973 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1975 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1977 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1979 if (HvEITER_get(hv))
1980 /* we are in an iteration so the hash cannot be empty */
1982 /* no xhv_eiter so now use FIRSTKEY */
1983 key = sv_newmortal();
1984 magic_nextpack(MUTABLE_SV(hv), mg, key);
1985 HvEITER_set(hv, NULL); /* need to reset iterator */
1986 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1989 /* there is a SCALAR method that we can call */
1990 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
1992 retval = &PL_sv_undef;
1997 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2001 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2003 /* The magic ptr/len for the debugger's hash should always be an SV. */
2004 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2005 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
2006 (IV)mg->mg_len, mg->mg_ptr);
2009 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2010 setting/clearing debugger breakpoints is not a hot path. */
2011 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2012 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2014 if (svp && SvIOKp(*svp)) {
2015 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2017 #ifdef PERL_DEBUG_READONLY_OPS
2018 Slab_to_rw(OpSLAB(o));
2020 /* set or clear breakpoint in the relevant control op */
2022 o->op_flags |= OPf_SPECIAL;
2024 o->op_flags &= ~OPf_SPECIAL;
2025 #ifdef PERL_DEBUG_READONLY_OPS
2026 Slab_to_ro(OpSLAB(o));
2034 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2036 AV * const obj = MUTABLE_AV(mg->mg_obj);
2038 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2041 sv_setiv(sv, AvFILL(obj));
2049 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2051 AV * const obj = MUTABLE_AV(mg->mg_obj);
2053 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2056 av_fill(obj, SvIV(sv));
2058 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2059 "Attempt to set length of freed array");
2065 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2067 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2068 PERL_UNUSED_ARG(sv);
2069 PERL_UNUSED_CONTEXT;
2071 /* Reset the iterator when the array is cleared */
2072 #if IVSIZE == I32SIZE
2073 *((IV *) &(mg->mg_len)) = 0;
2076 *((IV *) mg->mg_ptr) = 0;
2083 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2085 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2086 PERL_UNUSED_ARG(sv);
2088 /* during global destruction, mg_obj may already have been freed */
2089 if (PL_in_clean_all)
2092 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2095 /* arylen scalar holds a pointer back to the array, but doesn't own a
2096 reference. Hence the we (the array) are about to go away with it
2097 still pointing at us. Clear its pointer, else it would be pointing
2098 at free memory. See the comment in sv_magic about reference loops,
2099 and why it can't own a reference to us. */
2106 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2108 SV* const lsv = LvTARG(sv);
2109 MAGIC * const found = mg_find_mglob(lsv);
2111 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2112 PERL_UNUSED_ARG(mg);
2114 if (found && found->mg_len != -1) {
2115 STRLEN i = found->mg_len;
2116 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2117 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2126 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2128 SV* const lsv = LvTARG(sv);
2135 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2136 PERL_UNUSED_ARG(mg);
2138 found = mg_find_mglob(lsv);
2142 found = sv_magicext_mglob(lsv);
2144 else if (!SvOK(sv)) {
2148 s = SvPV_const(lsv, len);
2153 ulen = sv_or_pv_len_utf8(lsv, s, len);
2163 else if (pos > (SSize_t)len)
2166 found->mg_len = pos;
2167 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2173 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2176 SV * const lsv = LvTARG(sv);
2177 const char * const tmps = SvPV_const(lsv,len);
2178 STRLEN offs = LvTARGOFF(sv);
2179 STRLEN rem = LvTARGLEN(sv);
2180 const bool negoff = LvFLAGS(sv) & 1;
2181 const bool negrem = LvFLAGS(sv) & 2;
2183 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2184 PERL_UNUSED_ARG(mg);
2186 if (!translate_substr_offsets(
2187 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2188 negoff ? -(IV)offs : (IV)offs, !negoff,
2189 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2191 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2192 sv_setsv_nomg(sv, &PL_sv_undef);
2197 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2198 sv_setpvn(sv, tmps + offs, rem);
2205 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2207 STRLEN len, lsv_len, oldtarglen, newtarglen;
2208 const char * const tmps = SvPV_const(sv, len);
2209 SV * const lsv = LvTARG(sv);
2210 STRLEN lvoff = LvTARGOFF(sv);
2211 STRLEN lvlen = LvTARGLEN(sv);
2212 const bool negoff = LvFLAGS(sv) & 1;
2213 const bool neglen = LvFLAGS(sv) & 2;
2215 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2216 PERL_UNUSED_ARG(mg);
2220 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2221 "Attempt to use reference as lvalue in substr"
2223 SvPV_force_nomg(lsv,lsv_len);
2224 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2225 if (!translate_substr_offsets(
2227 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2228 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2230 Perl_croak(aTHX_ "substr outside of string");
2233 sv_utf8_upgrade_nomg(lsv);
2234 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2235 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2236 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2239 else if (SvUTF8(lsv)) {
2241 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2243 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2244 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2248 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2251 if (!neglen) LvTARGLEN(sv) = newtarglen;
2252 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2258 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2260 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2261 PERL_UNUSED_ARG(sv);
2262 #ifdef NO_TAINT_SUPPORT
2263 PERL_UNUSED_ARG(mg);
2266 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2271 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2273 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2274 PERL_UNUSED_ARG(sv);
2276 /* update taint status */
2285 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2287 SV * const lsv = LvTARG(sv);
2289 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2290 PERL_UNUSED_ARG(mg);
2292 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2298 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2300 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2301 PERL_UNUSED_ARG(mg);
2302 do_vecset(sv); /* XXX slurp this routine */
2307 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2310 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2311 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2313 if (LvTARGLEN(sv)) {
2315 SV * const ahv = LvTARG(sv);
2316 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2320 else if (LvSTARGOFF(sv) >= 0) {
2321 AV *const av = MUTABLE_AV(LvTARG(sv));
2322 if (LvSTARGOFF(sv) <= AvFILL(av))
2324 if (SvRMAGICAL(av)) {
2325 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2326 targ = svp ? *svp : NULL;
2329 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2332 if (targ && (targ != &PL_sv_undef)) {
2333 /* somebody else defined it for us */
2334 SvREFCNT_dec(LvTARG(sv));
2335 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2337 SvREFCNT_dec(mg->mg_obj);
2339 mg->mg_flags &= ~MGf_REFCOUNTED;
2348 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2350 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2352 sv_setsv(sv, defelem_target(sv, mg));
2357 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2359 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2360 PERL_UNUSED_ARG(mg);
2364 sv_setsv(LvTARG(sv), sv);
2365 SvSETMAGIC(LvTARG(sv));
2371 Perl_vivify_defelem(pTHX_ SV *sv)
2376 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2378 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2381 SV * const ahv = LvTARG(sv);
2382 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2385 if (!value || value == &PL_sv_undef)
2386 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2388 else if (LvSTARGOFF(sv) < 0)
2389 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2391 AV *const av = MUTABLE_AV(LvTARG(sv));
2392 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2393 LvTARG(sv) = NULL; /* array can't be extended */
2395 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2396 if (!svp || !(value = *svp))
2397 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2400 SvREFCNT_inc_simple_void(value);
2401 SvREFCNT_dec(LvTARG(sv));
2404 SvREFCNT_dec(mg->mg_obj);
2406 mg->mg_flags &= ~MGf_REFCOUNTED;
2410 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2412 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2413 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2418 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2420 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2421 PERL_UNUSED_CONTEXT;
2422 PERL_UNUSED_ARG(sv);
2428 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2430 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2432 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2434 if (uf && uf->uf_set)
2435 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2440 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2442 const char type = mg->mg_type;
2444 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2446 if (type == PERL_MAGIC_qr) {
2447 } else if (type == PERL_MAGIC_bm) {
2451 assert(type == PERL_MAGIC_fm);
2453 return sv_unmagic(sv, type);
2456 #ifdef USE_LOCALE_COLLATE
2458 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2460 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2463 * RenE<eacute> Descartes said "I think not."
2464 * and vanished with a faint plop.
2466 PERL_UNUSED_CONTEXT;
2467 PERL_UNUSED_ARG(sv);
2469 Safefree(mg->mg_ptr);
2475 #endif /* USE_LOCALE_COLLATE */
2477 /* Just clear the UTF-8 cache data. */
2479 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2481 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2482 PERL_UNUSED_CONTEXT;
2483 PERL_UNUSED_ARG(sv);
2484 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2486 mg->mg_len = -1; /* The mg_len holds the len cache. */
2491 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2493 const char *bad = NULL;
2494 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2495 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2496 switch (mg->mg_private & OPpLVREF_TYPE) {
2498 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2502 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2506 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2510 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2514 /* diag_listed_as: Assigned value is not %s reference */
2515 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2516 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2519 SV * const old = PAD_SV(mg->mg_len);
2520 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2525 gv_setref(mg->mg_obj, sv);
2526 SvSETMAGIC(mg->mg_obj);
2529 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2530 SvREFCNT_inc_simple_NN(SvRV(sv)));
2533 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2534 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2536 if (mg->mg_flags & MGf_PERSIST)
2537 NOOP; /* This sv is in use as an iterator var and will be reused,
2538 so we must leave the magic. */
2540 /* This sv could be returned by the assignment op, so clear the
2541 magic, as lvrefs are an implementation detail that must not be
2542 leaked to the user. */
2543 sv_unmagic(sv, PERL_MAGIC_lvref);
2548 S_set_dollarzero(pTHX_ SV *sv)
2549 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2556 #ifdef HAS_SETPROCTITLE
2557 /* The BSDs don't show the argv[] in ps(1) output, they
2558 * show a string from the process struct and provide
2559 * the setproctitle() routine to manipulate that. */
2560 if (PL_origalen != 1) {
2561 s = SvPV_const(sv, len);
2562 # if __FreeBSD_version > 410001
2563 /* The leading "-" removes the "perl: " prefix,
2564 * but not the "(perl) suffix from the ps(1)
2565 * output, because that's what ps(1) shows if the
2566 * argv[] is modified. */
2567 setproctitle("-%s", s);
2568 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2569 /* This doesn't really work if you assume that
2570 * $0 = 'foobar'; will wipe out 'perl' from the $0
2571 * because in ps(1) output the result will be like
2572 * sprintf("perl: %s (perl)", s)
2573 * I guess this is a security feature:
2574 * one (a user process) cannot get rid of the original name.
2576 setproctitle("%s", s);
2579 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2580 if (PL_origalen != 1) {
2582 s = SvPV_const(sv, len);
2583 un.pst_command = (char *)s;
2584 pstat(PSTAT_SETCMD, un, len, 0, 0);
2587 if (PL_origalen > 1) {
2589 /* PL_origalen is set in perl_parse(). */
2590 s = SvPV_force(sv,len);
2591 if (len >= (STRLEN)PL_origalen-1) {
2592 /* Longer than original, will be truncated. We assume that
2593 * PL_origalen bytes are available. */
2594 Copy(s, PL_origargv[0], PL_origalen-1, char);
2597 /* Shorter than original, will be padded. */
2599 /* Special case for Mac OS X: see [perl #38868] */
2602 /* Is the space counterintuitive? Yes.
2603 * (You were expecting \0?)
2604 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2606 const int pad = ' ';
2608 Copy(s, PL_origargv[0], len, char);
2609 PL_origargv[0][len] = 0;
2610 memset(PL_origargv[0] + len + 1,
2611 pad, PL_origalen - len - 1);
2613 PL_origargv[0][PL_origalen-1] = 0;
2614 for (i = 1; i < PL_origargc; i++)
2616 #ifdef HAS_PRCTL_SET_NAME
2617 /* Set the legacy process name in addition to the POSIX name on Linux */
2618 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2619 /* diag_listed_as: SKIPME */
2620 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2628 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2639 PERL_ARGS_ASSERT_MAGIC_SET;
2643 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2645 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2647 /* Croak with a READONLY error when a numbered match var is
2648 * set without a previous pattern match. Unless it's C<local $1>
2651 if (!PL_localizing) {
2652 Perl_croak_no_modify();
2658 switch (*mg->mg_ptr) {
2659 case '\001': /* ^A */
2660 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2661 else SvOK_off(PL_bodytarget);
2662 FmLINES(PL_bodytarget) = 0;
2663 if (SvPOK(PL_bodytarget)) {
2664 char *s = SvPVX(PL_bodytarget);
2665 while ( ((s = strchr(s, '\n'))) ) {
2666 FmLINES(PL_bodytarget)++;
2670 /* mg_set() has temporarily made sv non-magical */
2672 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2673 SvTAINTED_on(PL_bodytarget);
2675 SvTAINTED_off(PL_bodytarget);
2678 case '\003': /* ^C */
2679 PL_minus_c = cBOOL(SvIV(sv));
2682 case '\004': /* ^D */
2685 const char *s = SvPV_nolen_const(sv);
2686 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2687 if (DEBUG_x_TEST || DEBUG_B_TEST)
2688 dump_all_perl(!DEBUG_B_TEST);
2691 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2694 case '\005': /* ^E */
2695 if (*(mg->mg_ptr+1) == '\0') {
2697 set_vaxc_errno(SvIV(sv));
2700 SetLastError( SvIV(sv) );
2703 os2_setsyserrno(SvIV(sv));
2705 /* will anyone ever use this? */
2706 SETERRNO(SvIV(sv), 4);
2712 if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2713 if (PL_localizing != 2) {
2714 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2715 "${^ENCODING} is no longer supported");
2719 case '\006': /* ^F */
2720 PL_maxsysfd = SvIV(sv);
2722 case '\010': /* ^H */
2723 PL_hints = SvIV(sv);
2725 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2726 Safefree(PL_inplace);
2727 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2729 case '\016': /* ^N */
2730 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2731 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2733 case '\017': /* ^O */
2734 if (*(mg->mg_ptr+1) == '\0') {
2735 Safefree(PL_osname);
2738 TAINT_PROPER("assigning to $^O");
2739 PL_osname = savesvpv(sv);
2742 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2744 const char *const start = SvPV(sv, len);
2745 const char *out = (const char*)memchr(start, '\0', len);
2749 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2750 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2752 /* Opening for input is more common than opening for output, so
2753 ensure that hints for input are sooner on linked list. */
2754 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2756 : newSVpvs_flags("", SvUTF8(sv));
2757 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2760 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2762 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2766 case '\020': /* ^P */
2767 PL_perldb = SvIV(sv);
2768 if (PL_perldb && !PL_DBsingle)
2771 case '\024': /* ^T */
2773 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2775 PL_basetime = (Time_t)SvIV(sv);
2778 case '\025': /* ^UTF8CACHE */
2779 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2780 PL_utf8cache = (signed char) sv_2iv(sv);
2783 case '\027': /* ^W & $^WARNING_BITS */
2784 if (*(mg->mg_ptr+1) == '\0') {
2785 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2787 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2788 | (i ? G_WARN_ON : G_WARN_OFF) ;
2791 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2792 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2794 PL_compiling.cop_warnings = pWARN_STD;
2799 int accumulate = 0 ;
2800 int any_fatals = 0 ;
2801 const char * const ptr = SvPV_const(sv, len) ;
2802 for (i = 0 ; i < len ; ++i) {
2803 accumulate |= ptr[i] ;
2804 any_fatals |= (ptr[i] & 0xAA) ;
2807 if (!specialWARN(PL_compiling.cop_warnings))
2808 PerlMemShared_free(PL_compiling.cop_warnings);
2809 PL_compiling.cop_warnings = pWARN_NONE;
2811 /* Yuck. I can't see how to abstract this: */
2813 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2817 if (!specialWARN(PL_compiling.cop_warnings))
2818 PerlMemShared_free(PL_compiling.cop_warnings);
2819 PL_compiling.cop_warnings = pWARN_ALL;
2820 PL_dowarn |= G_WARN_ONCE ;
2824 const char *const p = SvPV_const(sv, len);
2826 PL_compiling.cop_warnings
2827 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2830 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2831 PL_dowarn |= G_WARN_ONCE ;
2838 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2839 w32_sloppystat = (bool)sv_true(sv);
2844 if (PL_localizing) {
2845 if (PL_localizing == 1)
2846 SAVESPTR(PL_last_in_gv);
2848 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2849 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2852 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2853 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2854 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2857 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2858 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2859 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2862 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2865 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2866 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2867 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2870 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2874 IO * const io = GvIO(PL_defoutgv);
2877 if ((SvIV(sv)) == 0)
2878 IoFLAGS(io) &= ~IOf_FLUSH;
2880 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2881 PerlIO *ofp = IoOFP(io);
2883 (void)PerlIO_flush(ofp);
2884 IoFLAGS(io) |= IOf_FLUSH;
2893 SV *referent= SvRV(sv);
2894 const char *reftype= sv_reftype(referent, 0);
2895 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2896 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2897 * a full string comparison on the return of sv_reftype() both of which
2898 * make me feel worse! NOTE, do not modify this comment without reviewing the
2899 * corresponding comment in sv_reftype(). - Yves */
2900 if (reftype[0] == 'S' || reftype[0] == 'L') {
2901 IV val= SvIV(referent);
2903 tmpsv= &PL_sv_undef;
2904 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2905 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2906 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2910 sv_setsv(sv, PL_rs);
2911 /* diag_listed_as: Setting $/ to %s reference is forbidden */
2912 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2913 *reftype == 'A' ? "n" : "", reftype);
2916 SvREFCNT_dec(PL_rs);
2917 PL_rs = newSVsv(tmpsv);
2921 SvREFCNT_dec(PL_ors_sv);
2923 PL_ors_sv = newSVsv(sv);
2931 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2934 #ifdef COMPLEX_STATUS
2935 if (PL_localizing == 2) {
2936 SvUPGRADE(sv, SVt_PVLV);
2937 PL_statusvalue = LvTARGOFF(sv);
2938 PL_statusvalue_vms = LvTARGLEN(sv);
2942 #ifdef VMSISH_STATUS
2944 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2947 STATUS_UNIX_EXIT_SET(SvIV(sv));
2952 # define PERL_VMS_BANG vaxc$errno
2954 # define PERL_VMS_BANG 0
2956 #if defined(WIN32) && ! defined(UNDER_CE)
2957 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2958 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2960 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2961 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2967 /* XXX $< currently silently ignores failures */
2968 const Uid_t new_uid = SvUID(sv);
2969 PL_delaymagic_uid = new_uid;
2970 if (PL_delaymagic) {
2971 PL_delaymagic |= DM_RUID;
2972 break; /* don't do magic till later */
2975 PERL_UNUSED_RESULT(setruid(new_uid));
2978 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2980 #ifdef HAS_SETRESUID
2981 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
2983 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2985 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2986 if (new_uid != 0 && PerlProc_getuid() == 0)
2987 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2989 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
2991 Perl_croak(aTHX_ "setruid() not implemented");
3000 /* XXX $> currently silently ignores failures */
3001 const Uid_t new_euid = SvUID(sv);
3002 PL_delaymagic_euid = new_euid;
3003 if (PL_delaymagic) {
3004 PL_delaymagic |= DM_EUID;
3005 break; /* don't do magic till later */
3008 PERL_UNUSED_RESULT(seteuid(new_euid));
3011 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
3013 #ifdef HAS_SETRESUID
3014 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
3016 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
3017 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
3019 Perl_croak(aTHX_ "seteuid() not implemented");
3028 /* XXX $( currently silently ignores failures */
3029 const Gid_t new_gid = SvGID(sv);
3030 PL_delaymagic_gid = new_gid;
3031 if (PL_delaymagic) {
3032 PL_delaymagic |= DM_RGID;
3033 break; /* don't do magic till later */
3036 PERL_UNUSED_RESULT(setrgid(new_gid));
3039 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3041 #ifdef HAS_SETRESGID
3042 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3044 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3045 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3047 Perl_croak(aTHX_ "setrgid() not implemented");
3056 /* (hv) best guess: maybe we'll need configure probes to do a better job,
3057 * but you can override it if you need to.
3060 #define INVALID_GID ((Gid_t)-1)
3062 /* XXX $) currently silently ignores failures */
3064 #ifdef HAS_SETGROUPS
3066 const char *p = SvPV_const(sv, len);
3067 Groups_t *gary = NULL;
3070 #ifdef _SC_NGROUPS_MAX
3071 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3076 int maxgrp = NGROUPS;
3081 if (grok_atoUV(p, &uv, &endptr))
3082 new_egid = (Gid_t)uv;
3084 new_egid = INVALID_GID;
3087 for (i = 0; i < maxgrp; ++i) {
3096 Newx(gary, i + 1, Groups_t);
3098 Renew(gary, i + 1, Groups_t);
3099 if (grok_atoUV(p, &uv, &endptr))
3100 gary[i] = (Groups_t)uv;
3102 gary[i] = INVALID_GID;
3107 PERL_UNUSED_RESULT(setgroups(i, gary));
3110 #else /* HAS_SETGROUPS */
3111 new_egid = SvGID(sv);
3112 #endif /* HAS_SETGROUPS */
3113 PL_delaymagic_egid = new_egid;
3114 if (PL_delaymagic) {
3115 PL_delaymagic |= DM_EGID;
3116 break; /* don't do magic till later */
3119 PERL_UNUSED_RESULT(setegid(new_egid));
3122 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3124 #ifdef HAS_SETRESGID
3125 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3127 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3128 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3130 Perl_croak(aTHX_ "setegid() not implemented");
3138 PL_chopset = SvPV_force(sv,len);
3141 /* Store the pid in mg->mg_obj so we can tell when a fork has
3142 occurred. mg->mg_obj points to *$ by default, so clear it. */
3143 if (isGV(mg->mg_obj)) {
3144 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3145 SvREFCNT_dec(mg->mg_obj);
3146 mg->mg_flags |= MGf_REFCOUNTED;
3147 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3149 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3152 LOCK_DOLLARZERO_MUTEX;
3153 S_set_dollarzero(aTHX_ sv);
3154 UNLOCK_DOLLARZERO_MUTEX;
3161 Perl_whichsig_sv(pTHX_ SV *sigsv)
3165 PERL_ARGS_ASSERT_WHICHSIG_SV;
3166 sigpv = SvPV_const(sigsv, siglen);
3167 return whichsig_pvn(sigpv, siglen);
3171 Perl_whichsig_pv(pTHX_ const char *sig)
3173 PERL_ARGS_ASSERT_WHICHSIG_PV;
3174 return whichsig_pvn(sig, strlen(sig));
3178 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3182 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3183 PERL_UNUSED_CONTEXT;
3185 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3186 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3187 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3189 if (memEQs(sig, len, "CHLD"))
3193 if (memEQs(sig, len, "CLD"))
3200 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3201 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3203 Perl_sighandler(int sig)
3206 #ifdef PERL_GET_SIG_CONTEXT
3207 dTHXa(PERL_GET_SIG_CONTEXT);
3214 SV * const tSv = PL_Sv;
3218 XPV * const tXpv = PL_Xpv;
3219 I32 old_ss_ix = PL_savestack_ix;
3220 SV *errsv_save = NULL;
3223 if (!PL_psig_ptr[sig]) {
3224 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3229 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3230 /* Max number of items pushed there is 3*n or 4. We cannot fix
3231 infinity, so we fix 4 (in fact 5): */
3232 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3234 PL_savestack_ix += 5; /* Protect save in progress. */
3235 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3238 /* sv_2cv is too complicated, try a simpler variant first: */
3239 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3240 || SvTYPE(cv) != SVt_PVCV) {
3242 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3245 if (!cv || !CvROOT(cv)) {
3246 const HEK * const hek = gv
3250 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3252 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3253 "SIG%s handler \"%"HEKf"\" not defined.\n",
3254 PL_sig_name[sig], HEKfARG(hek));
3255 /* diag_listed_as: SIG%s handler "%s" not defined */
3256 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3257 "SIG%s handler \"__ANON__\" not defined.\n",
3262 sv = PL_psig_name[sig]
3263 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3264 : newSVpv(PL_sig_name[sig],0);
3268 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3269 /* make sure our assumption about the size of the SAVEs are correct:
3270 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3271 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3274 PUSHSTACKi(PERLSI_SIGNAL);
3277 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3279 struct sigaction oact;
3281 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3284 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3285 /* The siginfo fields signo, code, errno, pid, uid,
3286 * addr, status, and band are defined by POSIX/SUSv3. */
3287 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3288 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3289 #ifdef HAS_SIGINFO_SI_ERRNO
3290 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3292 #ifdef HAS_SIGINFO_SI_STATUS
3293 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3295 #ifdef HAS_SIGINFO_SI_UID
3298 sv_setuid(uid, sip->si_uid);
3299 (void)hv_stores(sih, "uid", uid);
3302 #ifdef HAS_SIGINFO_SI_PID
3303 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3305 #ifdef HAS_SIGINFO_SI_ADDR
3306 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3308 #ifdef HAS_SIGINFO_SI_BAND
3309 (void)hv_stores(sih, "band", newSViv(sip->si_band));
3313 mPUSHp((char *)sip, sizeof(*sip));
3321 errsv_save = newSVsv(ERRSV);
3323 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3327 SV * const errsv = ERRSV;
3328 if (SvTRUE_NN(errsv)) {
3329 SvREFCNT_dec(errsv_save);
3331 /* Handler "died", for example to get out of a restart-able read().
3332 * Before we re-do that on its behalf re-enable the signal which was
3333 * blocked by the system when we entered.
3335 #ifdef HAS_SIGPROCMASK
3336 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3342 sigaddset(&set,sig);
3343 sigprocmask(SIG_UNBLOCK, &set, NULL);
3346 /* Not clear if this will work */
3347 (void)rsignal(sig, SIG_IGN);
3348 (void)rsignal(sig, PL_csighandlerp);
3350 #endif /* !PERL_MICRO */
3354 sv_setsv(errsv, errsv_save);
3355 SvREFCNT_dec(errsv_save);
3360 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3361 PL_savestack_ix = old_ss_ix;
3363 SvREFCNT_dec_NN(sv);
3364 PL_op = myop; /* Apparently not needed... */
3366 PL_Sv = tSv; /* Restore global temporaries. */
3373 S_restore_magic(pTHX_ const void *p)
3375 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3376 SV* const sv = mgs->mgs_sv;
3382 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3383 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3385 SvFLAGS(sv) |= mgs->mgs_flags;
3390 bumped = mgs->mgs_bumped;
3391 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3393 /* If we're still on top of the stack, pop us off. (That condition
3394 * will be satisfied if restore_magic was called explicitly, but *not*
3395 * if it's being called via leave_scope.)
3396 * The reason for doing this is that otherwise, things like sv_2cv()
3397 * may leave alloc gunk on the savestack, and some code
3398 * (e.g. sighandler) doesn't expect that...
3400 if (PL_savestack_ix == mgs->mgs_ss_ix)
3402 UV popval = SSPOPUV;
3403 assert(popval == SAVEt_DESTRUCTOR_X);
3404 PL_savestack_ix -= 2;
3406 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3407 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3410 if (SvREFCNT(sv) == 1) {
3411 /* We hold the last reference to this SV, which implies that the
3412 SV was deleted as a side effect of the routines we called.
3413 So artificially keep it alive a bit longer.
3414 We avoid turning on the TEMP flag, which can cause the SV's
3415 buffer to get stolen (and maybe other stuff). */
3420 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3424 /* clean up the mess created by Perl_sighandler().
3425 * Note that this is only called during an exit in a signal handler;
3426 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3430 S_unwind_handler_stack(pTHX_ const void *p)
3434 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3438 =for apidoc magic_sethint
3440 Triggered by a store to C<%^H>, records the key/value pair to
3441 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3442 anything that would need a deep copy. Maybe we should warn if we find a
3448 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3450 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3451 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3453 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3455 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3456 an alternative leaf in there, with PL_compiling.cop_hints being used if
3457 it's NULL. If needed for threads, the alternative could lock a mutex,
3458 or take other more complex action. */
3460 /* Something changed in %^H, so it will need to be restored on scope exit.
3461 Doing this here saves a lot of doing it manually in perl code (and
3462 forgetting to do it, and consequent subtle errors. */
3463 PL_hints |= HINT_LOCALIZE_HH;
3464 CopHINTHASH_set(&PL_compiling,
3465 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3470 =for apidoc magic_clearhint
3472 Triggered by a delete from C<%^H>, records the key to
3473 C<PL_compiling.cop_hints_hash>.
3478 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3480 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3481 PERL_UNUSED_ARG(sv);
3483 PL_hints |= HINT_LOCALIZE_HH;
3484 CopHINTHASH_set(&PL_compiling,
3485 mg->mg_len == HEf_SVKEY
3486 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3487 MUTABLE_SV(mg->mg_ptr), 0, 0)
3488 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3489 mg->mg_ptr, mg->mg_len, 0, 0));
3494 =for apidoc magic_clearhints
3496 Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
3501 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3503 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3504 PERL_UNUSED_ARG(sv);
3505 PERL_UNUSED_ARG(mg);
3506 cophh_free(CopHINTHASH_get(&PL_compiling));
3507 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3512 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3513 const char *name, I32 namlen)
3517 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3518 PERL_UNUSED_ARG(sv);
3519 PERL_UNUSED_ARG(name);
3520 PERL_UNUSED_ARG(namlen);
3522 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3523 nmg = mg_find(nsv, mg->mg_type);
3525 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3526 nmg->mg_ptr = mg->mg_ptr;
3527 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3528 nmg->mg_flags |= MGf_REFCOUNTED;
3533 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3534 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3536 #if DBVARMG_SINGLE != 0
3537 assert(mg->mg_private >= DBVARMG_SINGLE);
3539 assert(mg->mg_private < DBVARMG_COUNT);
3541 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3547 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3548 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3550 #if DBVARMG_SINGLE != 0
3551 assert(mg->mg_private >= DBVARMG_SINGLE);
3553 assert(mg->mg_private < DBVARMG_COUNT);
3554 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3560 * ex: set ts=8 sts=4 sw=4 et: