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 bool taint_only = TRUE; /* the only get method seen is taint */
175 MAGIC *newmg, *head, *cur, *mg;
177 PERL_ARGS_ASSERT_MG_GET;
179 if (PL_localizing == 1 && sv == DEFSV) return 0;
181 /* We must call svt_get(sv, mg) for each valid entry in the linked
182 list of magic. svt_get() may delete the current entry, add new
183 magic to the head of the list, or upgrade the SV. AMS 20010810 */
185 newmg = cur = head = mg = SvMAGIC(sv);
187 const MGVTBL * const vtbl = mg->mg_virtual;
188 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
190 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
192 /* taint's mg get is so dumb it doesn't need flag saving */
193 if (mg->mg_type != PERL_MAGIC_taint) {
196 save_magic(mgs_ix, sv);
201 vtbl->svt_get(aTHX_ sv, mg);
203 /* guard against magic having been deleted - eg FETCH calling
206 /* recalculate flags */
207 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
211 /* recalculate flags if this entry was deleted. */
212 if (mg->mg_flags & MGf_GSKIP)
213 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
214 ~(SVs_GMG|SVs_SMG|SVs_RMG);
216 else if (vtbl == &PL_vtbl_utf8) {
217 /* get-magic can reallocate the PV, unless there's only taint
221 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
222 if ( mg2->mg_type != PERL_MAGIC_taint
223 && !(mg2->mg_flags & MGf_GSKIP)
225 && mg2->mg_virtual->svt_get
233 magic_setutf8(sv, mg);
239 /* Have we finished with the new entries we saw? Start again
240 where we left off (unless there are more new entries). */
248 /* Were any new entries added? */
249 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
253 /* recalculate flags */
254 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
259 restore_magic(INT2PTR(void *, (IV)mgs_ix));
267 Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
273 Perl_mg_set(pTHX_ SV *sv)
275 const I32 mgs_ix = SSNEW(sizeof(MGS));
279 PERL_ARGS_ASSERT_MG_SET;
281 if (PL_localizing == 2 && sv == DEFSV) return 0;
283 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
285 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
286 const MGVTBL* vtbl = mg->mg_virtual;
287 nextmg = mg->mg_moremagic; /* it may delete itself */
288 if (mg->mg_flags & MGf_GSKIP) {
289 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
290 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
292 if (PL_localizing == 2
293 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
295 if (vtbl && vtbl->svt_set)
296 vtbl->svt_set(aTHX_ sv, mg);
299 restore_magic(INT2PTR(void*, (IV)mgs_ix));
304 =for apidoc mg_length
306 Reports on the SV's length in bytes, calling length magic if available,
307 but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
308 magic if there is no 'length' magic, but with no indication as to
309 whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
310 higher. Use C<sv_len()> instead.
316 Perl_mg_length(pTHX_ SV *sv)
321 PERL_ARGS_ASSERT_MG_LENGTH;
323 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
324 const MGVTBL * const vtbl = mg->mg_virtual;
325 if (vtbl && vtbl->svt_len) {
326 const I32 mgs_ix = SSNEW(sizeof(MGS));
327 save_magic(mgs_ix, sv);
328 /* omit MGf_GSKIP -- not changed here */
329 len = vtbl->svt_len(aTHX_ sv, mg);
330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
335 (void)SvPV_const(sv, len);
340 Perl_mg_size(pTHX_ SV *sv)
344 PERL_ARGS_ASSERT_MG_SIZE;
346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
347 const MGVTBL* const vtbl = mg->mg_virtual;
348 if (vtbl && vtbl->svt_len) {
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
351 save_magic(mgs_ix, sv);
352 /* omit MGf_GSKIP -- not changed here */
353 len = vtbl->svt_len(aTHX_ sv, mg);
354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
361 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
365 Perl_croak(aTHX_ "Size magic not implemented");
368 NOT_REACHED; /* NOTREACHED */
374 Clear something magical that the SV represents. See C<L</sv_magic>>.
380 Perl_mg_clear(pTHX_ SV *sv)
382 const I32 mgs_ix = SSNEW(sizeof(MGS));
386 PERL_ARGS_ASSERT_MG_CLEAR;
388 save_magic(mgs_ix, sv);
390 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
391 const MGVTBL* const vtbl = mg->mg_virtual;
392 /* omit GSKIP -- never set here */
394 nextmg = mg->mg_moremagic; /* it may delete itself */
396 if (vtbl && vtbl->svt_clear)
397 vtbl->svt_clear(aTHX_ sv, mg);
400 restore_magic(INT2PTR(void*, (IV)mgs_ix));
405 S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
412 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
413 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
425 Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
431 Perl_mg_find(const SV *sv, int type)
433 return S_mg_findext_flags(sv, type, NULL, 0);
437 =for apidoc mg_findext
439 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
446 Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
448 return S_mg_findext_flags(sv, type, vtbl, 1);
452 Perl_mg_find_mglob(pTHX_ SV *sv)
454 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
455 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
456 /* This sv is only a delegate. //g magic must be attached to
461 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
462 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
469 Copies the magic from one SV to another. See C<L</sv_magic>>.
475 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
480 PERL_ARGS_ASSERT_MG_COPY;
482 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
483 const MGVTBL* const vtbl = mg->mg_virtual;
484 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
485 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
488 const char type = mg->mg_type;
489 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
491 (type == PERL_MAGIC_tied)
494 toLOWER(type), key, klen);
503 =for apidoc mg_localize
505 Copy some of the magic from an existing SV to new localized version of that
506 SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
507 gets copied, value magic doesn't (I<e.g.>,
510 If C<setmagic> is false then no set magic will be called on the new (empty) SV.
511 This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
512 and that will handle the magic.
518 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
528 const MGVTBL* const vtbl = mg->mg_virtual;
529 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
533 (void)vtbl->svt_local(aTHX_ nsv, mg);
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
538 /* container types should remain read-only across localization */
539 SvFLAGS(nsv) |= SvREADONLY(sv);
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
552 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
554 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
556 const MGVTBL* const vtbl = mg->mg_virtual;
557 if (vtbl && vtbl->svt_free)
558 vtbl->svt_free(aTHX_ sv, mg);
559 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
560 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
561 Safefree(mg->mg_ptr);
562 else if (mg->mg_len == HEf_SVKEY)
563 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
565 if (mg->mg_flags & MGf_REFCOUNTED)
566 SvREFCNT_dec(mg->mg_obj);
573 Free any magic storage used by the SV. See C<L</sv_magic>>.
579 Perl_mg_free(pTHX_ SV *sv)
584 PERL_ARGS_ASSERT_MG_FREE;
586 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
587 moremagic = mg->mg_moremagic;
588 mg_free_struct(sv, mg);
589 SvMAGIC_set(sv, moremagic);
591 SvMAGIC_set(sv, NULL);
597 =for apidoc Am|void|mg_free_type|SV *sv|int how
599 Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
605 Perl_mg_free_type(pTHX_ SV *sv, int how)
607 MAGIC *mg, *prevmg, *moremg;
608 PERL_ARGS_ASSERT_MG_FREE_TYPE;
609 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
611 moremg = mg->mg_moremagic;
612 if (mg->mg_type == how) {
613 /* temporarily move to the head of the magic chain, in case
614 custom free code relies on this historical aspect of mg_free */
616 prevmg->mg_moremagic = moremg;
617 mg->mg_moremagic = SvMAGIC(sv);
620 newhead = mg->mg_moremagic;
621 mg_free_struct(sv, mg);
622 SvMAGIC_set(sv, newhead);
632 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
636 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
639 REGEXP * const rx = PM_GETRE(PL_curpm);
641 UV uv= (UV)mg->mg_obj;
642 if (uv == '+') { /* @+ */
643 /* return the number possible */
644 return RX_NPARENS(rx);
645 } else { /* @- @^CAPTURE @{^CAPTURE} */
646 I32 paren = RX_LASTPAREN(rx);
648 /* return the last filled */
650 && (RX_OFFS(rx)[paren].start == -1
651 || RX_OFFS(rx)[paren].end == -1) )
657 /* @^CAPTURE @{^CAPTURE} */
658 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
670 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
672 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
675 REGEXP * const rx = PM_GETRE(PL_curpm);
677 const UV uv= (UV)mg->mg_obj;
678 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
679 const I32 paren = mg->mg_len
680 + (uv == '\003' ? 1 : 0);
685 if (paren <= (I32)RX_NPARENS(rx) &&
686 (s = RX_OFFS(rx)[paren].start) != -1 &&
687 (t = RX_OFFS(rx)[paren].end) != -1)
691 if (uv == '+') /* @+ */
693 else if (uv == '-') /* @- */
695 else { /* @^CAPTURE @{^CAPTURE} */
696 CALLREG_NUMBUF_FETCH(rx,paren,sv);
700 if (RX_MATCH_UTF8(rx)) {
701 const char * const b = RX_SUBBEG(rx);
703 i = RX_SUBCOFFSET(rx) +
705 (U8*)(b-RX_SUBOFFSET(rx)+i));
720 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
722 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
726 Perl_croak_no_modify();
727 NORETURN_FUNCTION_END;
730 #define SvRTRIM(sv) STMT_START { \
732 STRLEN len = SvCUR(sv); \
733 char * const p = SvPVX(sv); \
734 while (len > 0 && isSPACE(p[len-1])) \
736 SvCUR_set(sv, len); \
742 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
744 PERL_ARGS_ASSERT_EMULATE_COP_IO;
746 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
751 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
752 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
757 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
758 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
766 S_fixup_errno_string(pTHX_ SV* sv)
768 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
771 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
775 if(strEQ(SvPVX(sv), "")) {
776 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
780 /* In some locales the error string may come back as UTF-8, in which
781 * case we should turn on that flag. This didn't use to happen, and to
782 * avoid as many possible backward compatibility issues as possible, we
783 * don't turn on the flag unless we have to. So the flag stays off for
784 * an entirely invariant string. We assume that if the string looks
785 * like UTF-8, it really is UTF-8: "text in any other encoding that
786 * uses bytes with the high bit set is extremely unlikely to pass a
787 * UTF-8 validity test"
788 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
789 * potential that we will get it wrong however, especially on short
790 * error message text. (If it turns out to be necessary, we could also
791 * keep track if the current LC_MESSAGES locale is UTF-8) */
792 if (! IN_BYTES /* respect 'use bytes' */
793 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
794 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
807 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
810 const char *s = NULL;
812 const char * const remaining = mg->mg_ptr + 1;
815 PERL_ARGS_ASSERT_MAGIC_GET;
819 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
821 CALLREG_NUMBUF_FETCH(rx,paren,sv);
828 nextchar = *remaining;
829 switch (*mg->mg_ptr) {
830 case '\001': /* ^A */
831 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
834 if (SvTAINTED(PL_bodytarget))
837 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
838 if (nextchar == '\0') {
839 sv_setiv(sv, (IV)PL_minus_c);
841 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
842 sv_setiv(sv, (IV)STATUS_NATIVE);
846 case '\004': /* ^D */
847 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
849 case '\005': /* ^E */
850 if (nextchar != '\0') {
851 if (strEQ(remaining, "NCODING"))
856 #if defined(VMS) || defined(OS2) || defined(WIN32)
860 $DESCRIPTOR(msgdsc,msg);
861 sv_setnv(sv,(NV) vaxc$errno);
862 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
863 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
868 if (!(_emx_env & 0x200)) { /* Under DOS */
869 sv_setnv(sv, (NV)errno);
870 sv_setpv(sv, errno ? my_strerror(errno) : "");
872 if (errno != errno_isOS2) {
873 const int tmp = _syserrno();
874 if (tmp) /* 2nd call to _syserrno() makes it 0 */
877 sv_setnv(sv, (NV)Perl_rc);
878 sv_setpv(sv, os2error(Perl_rc));
880 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
881 fixup_errno_string(sv);
883 # elif defined(WIN32)
885 const DWORD dwErr = GetLastError();
886 sv_setnv(sv, (NV)dwErr);
888 PerlProc_GetOSError(sv, dwErr);
889 fixup_errno_string(sv);
896 # error Missing code for platform
899 SvNOK_on(sv); /* what a wonderful hack! */
901 #endif /* End of platforms with special handling for $^E; others just fall
908 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
910 sv_setnv(sv, (NV)errno);
913 if (errno == errno_isOS2 || errno == errno_isOS2_set)
914 sv_setpv(sv, os2error(Perl_rc));
922 /* Strerror can return NULL on some platforms, which will
923 * result in 'sv' not being considered SvOK. The SvNOK_on()
924 * below will cause just the number part to be valid */
925 sv_setpv(sv, my_strerror(errno));
927 fixup_errno_string(sv);
934 SvNOK_on(sv); /* what a wonderful hack! */
937 case '\006': /* ^F */
938 sv_setiv(sv, (IV)PL_maxsysfd);
940 case '\007': /* ^GLOBAL_PHASE */
941 if (strEQ(remaining, "LOBAL_PHASE")) {
942 sv_setpvn(sv, PL_phase_names[PL_phase],
943 strlen(PL_phase_names[PL_phase]));
946 case '\010': /* ^H */
947 sv_setuv(sv, PL_hints);
949 case '\011': /* ^I */ /* NOT \t in EBCDIC */
950 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
952 case '\014': /* ^LAST_FH */
953 if (strEQ(remaining, "AST_FH")) {
955 assert(isGV_with_GP(PL_last_in_gv));
956 SV_CHECK_THINKFIRST_COW_DROP(sv);
957 prepare_SV_for_RV(sv);
959 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
963 else sv_setsv_nomg(sv, NULL);
966 case '\017': /* ^O & ^OPEN */
967 if (nextchar == '\0') {
968 sv_setpv(sv, PL_osname);
971 else if (strEQ(remaining, "PEN")) {
972 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
976 sv_setiv(sv, (IV)PL_perldb);
978 case '\023': /* ^S */
980 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
983 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
988 case '\024': /* ^T */
989 if (nextchar == '\0') {
991 sv_setnv(sv, PL_basetime);
993 sv_setiv(sv, (IV)PL_basetime);
996 else if (strEQ(remaining, "AINT"))
997 sv_setiv(sv, TAINTING_get
998 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
1001 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
1002 if (strEQ(remaining, "NICODE"))
1003 sv_setuv(sv, (UV) PL_unicode);
1004 else if (strEQ(remaining, "TF8LOCALE"))
1005 sv_setuv(sv, (UV) PL_utf8locale);
1006 else if (strEQ(remaining, "TF8CACHE"))
1007 sv_setiv(sv, (IV) PL_utf8cache);
1009 case '\027': /* ^W & $^WARNING_BITS */
1010 if (nextchar == '\0')
1011 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
1012 else if (strEQ(remaining, "ARNING_BITS")) {
1013 if (PL_compiling.cop_warnings == pWARN_NONE) {
1014 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
1016 else if (PL_compiling.cop_warnings == pWARN_STD) {
1019 else if (PL_compiling.cop_warnings == pWARN_ALL) {
1020 /* Get the bit mask for $warnings::Bits{all}, because
1021 * it could have been extended by warnings::register */
1022 HV * const bits = get_hv("warnings::Bits", 0);
1023 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1025 sv_copypv(sv, *bits_all);
1027 sv_setpvn(sv, WARN_ALLstring, WARNsize);
1030 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1031 *PL_compiling.cop_warnings);
1035 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1036 sv_setiv(sv, w32_sloppystat);
1041 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1042 paren = RX_LASTPAREN(rx);
1044 goto do_numbuf_fetch;
1047 case '\016': /* ^N */
1048 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1049 paren = RX_LASTCLOSEPAREN(rx);
1051 goto do_numbuf_fetch;
1055 if (GvIO(PL_last_in_gv)) {
1056 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1061 sv_setiv(sv, (IV)STATUS_CURRENT);
1062 #ifdef COMPLEX_STATUS
1063 SvUPGRADE(sv, SVt_PVLV);
1064 LvTARGOFF(sv) = PL_statusvalue;
1065 LvTARGLEN(sv) = PL_statusvalue_vms;
1070 if (GvIOp(PL_defoutgv))
1071 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1075 sv_setpv(sv,GvENAME(PL_defoutgv));
1076 sv_catpvs(sv,"_TOP");
1080 if (GvIOp(PL_defoutgv))
1081 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1083 s = GvENAME(PL_defoutgv);
1087 if (GvIO(PL_defoutgv))
1088 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1091 if (GvIO(PL_defoutgv))
1092 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1095 if (GvIO(PL_defoutgv))
1096 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1105 if (GvIO(PL_defoutgv))
1106 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1110 sv_copypv(sv, PL_ors_sv);
1116 IV const pid = (IV)PerlProc_getpid();
1117 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1118 /* never set manually, or at least not since last fork */
1120 /* never unsafe, even if reading in a tainted expression */
1123 /* else a value has been assigned manually, so do nothing */
1127 sv_setuid(sv, PerlProc_getuid());
1130 sv_setuid(sv, PerlProc_geteuid());
1133 sv_setgid(sv, PerlProc_getgid());
1136 sv_setgid(sv, PerlProc_getegid());
1138 #ifdef HAS_GETGROUPS
1140 Groups_t *gary = NULL;
1142 I32 num_groups = getgroups(0, gary);
1143 if (num_groups > 0) {
1144 Newx(gary, num_groups, Groups_t);
1145 num_groups = getgroups(num_groups, gary);
1146 for (i = 0; i < num_groups; i++)
1147 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
1151 (void)SvIOK_on(sv); /* what a wonderful hack! */
1165 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1167 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1169 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1171 if (uf && uf->uf_val)
1172 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1177 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1179 STRLEN len = 0, klen;
1180 const char * const key = MgPV_const(mg,klen);
1183 PERL_ARGS_ASSERT_MAGIC_SETENV;
1187 /* defined environment variables are byte strings; unfortunately
1188 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1189 (void)SvPV_force_nomg_nolen(sv);
1190 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1192 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1198 my_setenv(key, s); /* does the deed */
1200 #ifdef DYNAMIC_ENV_FETCH
1201 /* We just undefd an environment var. Is a replacement */
1202 /* waiting in the wings? */
1204 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1206 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1210 #if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
1211 /* And you'll never guess what the dog had */
1212 /* in its mouth... */
1214 MgTAINTEDDIR_off(mg);
1216 if (s && memEQs(key, klen, "DCL$PATH")) {
1217 char pathbuf[256], eltbuf[256], *cp, *elt;
1220 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1222 do { /* DCL$PATH may be a search list */
1223 while (1) { /* as may dev portion of any element */
1224 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1225 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1226 cando_by_name(S_IWUSR,0,elt) ) {
1227 MgTAINTEDDIR_on(mg);
1231 if ((cp = strchr(elt, ':')) != NULL)
1233 if (my_trnlnm(elt, eltbuf, j++))
1239 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1242 if (s && memEQs(key, klen, "PATH")) {
1243 const char * const strend = s + len;
1245 /* set MGf_TAINTEDDIR if any component of the new path is
1246 * relative or world-writeable */
1247 while (s < strend) {
1251 #ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1252 const char path_sep = PL_perllib_sep;
1254 const char path_sep = ':';
1256 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
1257 s, strend, path_sep, &i);
1259 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1261 /* no colon thus no device name -- assume relative path */
1262 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1263 /* Using Unix separator, e.g. under bash, so act line Unix */
1264 || (PL_perllib_sep == ':' && *tmpbuf != '/')
1266 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1268 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1269 MgTAINTEDDIR_on(mg);
1275 #endif /* neither OS2 nor WIN32 nor MSDOS */
1281 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1283 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1284 PERL_UNUSED_ARG(sv);
1285 my_setenv(MgPV_nolen_const(mg),NULL);
1290 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1292 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1293 PERL_UNUSED_ARG(mg);
1295 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1297 if (PL_localizing) {
1300 hv_iterinit(MUTABLE_HV(sv));
1301 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1303 my_setenv(hv_iterkey(entry, &keylen),
1304 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1312 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1314 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1315 PERL_UNUSED_ARG(sv);
1316 PERL_UNUSED_ARG(mg);
1318 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1326 #ifdef HAS_SIGPROCMASK
1328 restore_sigmask(pTHX_ SV *save_sv)
1330 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1331 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1335 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1337 /* Are we fetching a signal entry? */
1338 int i = (I16)mg->mg_private;
1340 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1344 const char * sig = MgPV_const(mg, siglen);
1345 mg->mg_private = i = whichsig_pvn(sig, siglen);
1350 sv_setsv(sv,PL_psig_ptr[i]);
1352 Sighandler_t sigstate = rsignal_state(i);
1353 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1354 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1357 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1358 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1361 /* cache state so we don't fetch it again */
1362 if(sigstate == (Sighandler_t) SIG_IGN)
1363 sv_setpvs(sv,"IGNORE");
1366 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1373 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1375 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1377 magic_setsig(NULL, mg);
1378 return sv_unmagic(sv, mg->mg_type);
1382 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1383 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1385 Perl_csighandler(int sig)
1388 #ifdef PERL_GET_SIG_CONTEXT
1389 dTHXa(PERL_GET_SIG_CONTEXT);
1393 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1394 #if defined(__cplusplus) && defined(__GNUC__)
1395 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1396 * parameters would be warned about. */
1397 PERL_UNUSED_ARG(sip);
1398 PERL_UNUSED_ARG(uap);
1401 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1402 (void) rsignal(sig, PL_csighandlerp);
1403 if (PL_sig_ignoring[sig]) return;
1405 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1406 if (PL_sig_defaulting[sig])
1407 #ifdef KILL_BY_SIGPRC
1408 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1423 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1424 /* Call the perl level handler now--
1425 * with risk we may be in malloc() or being destructed etc. */
1426 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1427 (*PL_sighandlerp)(sig, NULL, NULL);
1429 (*PL_sighandlerp)(sig);
1432 if (!PL_psig_pend) return;
1433 /* Set a flag to say this signal is pending, that is awaiting delivery after
1434 * the current Perl opcode completes */
1435 PL_psig_pend[sig]++;
1437 #ifndef SIG_PENDING_DIE_COUNT
1438 # define SIG_PENDING_DIE_COUNT 120
1440 /* Add one to say _a_ signal is pending */
1441 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1442 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1443 (unsigned long)SIG_PENDING_DIE_COUNT);
1447 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1449 Perl_csighandler_init(void)
1452 if (PL_sig_handlers_initted) return;
1454 for (sig = 1; sig < SIG_SIZE; sig++) {
1455 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1457 PL_sig_defaulting[sig] = 1;
1458 (void) rsignal(sig, PL_csighandlerp);
1460 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1461 PL_sig_ignoring[sig] = 0;
1464 PL_sig_handlers_initted = 1;
1468 #if defined HAS_SIGPROCMASK
1470 unblock_sigmask(pTHX_ void* newset)
1472 PERL_UNUSED_CONTEXT;
1473 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1478 Perl_despatch_signals(pTHX)
1482 for (sig = 1; sig < SIG_SIZE; sig++) {
1483 if (PL_psig_pend[sig]) {
1485 #ifdef HAS_SIGPROCMASK
1486 /* From sigaction(2) (FreeBSD man page):
1487 * | Signal routines normally execute with the signal that
1488 * | caused their invocation blocked, but other signals may
1490 * Emulation of this behavior (from within Perl) is enabled
1494 sigset_t newset, oldset;
1496 sigemptyset(&newset);
1497 sigaddset(&newset, sig);
1498 sigprocmask(SIG_BLOCK, &newset, &oldset);
1499 was_blocked = sigismember(&oldset, sig);
1501 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1503 SAVEFREESV(save_sv);
1504 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1507 PL_psig_pend[sig] = 0;
1508 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1509 (*PL_sighandlerp)(sig, NULL, NULL);
1511 (*PL_sighandlerp)(sig);
1513 #ifdef HAS_SIGPROCMASK
1522 /* sv of NULL signifies that we're acting as magic_clearsig. */
1524 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1529 /* Need to be careful with SvREFCNT_dec(), because that can have side
1530 * effects (due to closures). We must make sure that the new disposition
1531 * is in place before it is called.
1535 #ifdef HAS_SIGPROCMASK
1539 const char *s = MgPV_const(mg,len);
1541 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1544 if (memEQs(s, len, "__DIE__"))
1546 else if (memEQs(s, len, "__WARN__")
1547 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1548 /* Merge the existing behaviours, which are as follows:
1549 magic_setsig, we always set svp to &PL_warnhook
1550 (hence we always change the warnings handler)
1551 For magic_clearsig, we don't change the warnings handler if it's
1552 set to the &PL_warnhook. */
1555 SV *tmp = sv_newmortal();
1556 Perl_croak(aTHX_ "No such hook: %s",
1557 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1561 if (*svp != PERL_WARNHOOK_FATAL)
1567 i = (I16)mg->mg_private;
1569 i = whichsig_pvn(s, len); /* ...no, a brick */
1570 mg->mg_private = (U16)i;
1574 SV *tmp = sv_newmortal();
1575 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1576 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1580 #ifdef HAS_SIGPROCMASK
1581 /* Avoid having the signal arrive at a bad time, if possible. */
1584 sigprocmask(SIG_BLOCK, &set, &save);
1586 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1587 SAVEFREESV(save_sv);
1588 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1591 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1592 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1594 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1595 PL_sig_ignoring[i] = 0;
1597 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1598 PL_sig_defaulting[i] = 0;
1600 to_dec = PL_psig_ptr[i];
1602 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1603 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1605 /* Signals don't change name during the program's execution, so once
1606 they're cached in the appropriate slot of PL_psig_name, they can
1609 Ideally we'd find some way of making SVs at (C) compile time, or
1610 at least, doing most of the work. */
1611 if (!PL_psig_name[i]) {
1612 PL_psig_name[i] = newSVpvn(s, len);
1613 SvREADONLY_on(PL_psig_name[i]);
1616 SvREFCNT_dec(PL_psig_name[i]);
1617 PL_psig_name[i] = NULL;
1618 PL_psig_ptr[i] = NULL;
1621 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1623 (void)rsignal(i, PL_csighandlerp);
1626 *svp = SvREFCNT_inc_simple_NN(sv);
1628 if (sv && SvOK(sv)) {
1629 s = SvPV_force(sv, len);
1633 if (sv && memEQs(s, len,"IGNORE")) {
1635 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1636 PL_sig_ignoring[i] = 1;
1637 (void)rsignal(i, PL_csighandlerp);
1639 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1643 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1645 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1646 PL_sig_defaulting[i] = 1;
1647 (void)rsignal(i, PL_csighandlerp);
1649 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1655 * We should warn if HINT_STRICT_REFS, but without
1656 * access to a known hint bit in a known OP, we can't
1657 * tell whether HINT_STRICT_REFS is in force or not.
1659 if (!strchr(s,':') && !strchr(s,'\''))
1660 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1663 (void)rsignal(i, PL_csighandlerp);
1665 *svp = SvREFCNT_inc_simple_NN(sv);
1669 #ifdef HAS_SIGPROCMASK
1673 SvREFCNT_dec(to_dec);
1676 #endif /* !PERL_MICRO */
1679 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1681 PERL_ARGS_ASSERT_MAGIC_SETISA;
1682 PERL_UNUSED_ARG(sv);
1684 /* Skip _isaelem because _isa will handle it shortly */
1685 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1688 return magic_clearisa(NULL, mg);
1691 /* sv of NULL signifies that we're acting as magic_setisa. */
1693 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1696 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1698 /* Bail out if destruction is going on */
1699 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1702 av_clear(MUTABLE_AV(sv));
1704 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1705 /* This occurs with setisa_elem magic, which calls this
1707 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1710 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1711 SV **svp = AvARRAY((AV *)mg->mg_obj);
1712 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1714 stash = GvSTASH((GV *)*svp++);
1715 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1722 (const GV *)mg->mg_obj
1725 /* The stash may have been detached from the symbol table, so check its
1726 name before doing anything. */
1727 if (stash && HvENAME_get(stash))
1728 mro_isa_changed_in(stash);
1734 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1736 HV * const hv = MUTABLE_HV(LvTARG(sv));
1739 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1740 PERL_UNUSED_ARG(mg);
1743 (void) hv_iterinit(hv);
1744 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1747 while (hv_iternext(hv))
1752 sv_setiv(sv, (IV)i);
1757 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1759 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1760 PERL_UNUSED_ARG(mg);
1762 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1768 =for apidoc magic_methcall
1770 Invoke a magic method (like FETCH).
1772 C<sv> and C<mg> are the tied thingy and the tie magic.
1774 C<meth> is the name of the method to call.
1776 C<argc> is the number of args (in addition to $self) to pass to the method.
1778 The C<flags> can be:
1780 G_DISCARD invoke method with G_DISCARD flag and don't
1782 G_UNDEF_FILL fill the stack with argc pointers to
1785 The arguments themselves are any values following the C<flags> argument.
1787 Returns the SV (if any) returned by the method, or C<NULL> on failure.
1794 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1800 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1804 if (flags & G_WRITING_TO_STDERR) {
1808 SAVESPTR(PL_stderrgv);
1812 PUSHSTACKi(PERLSI_MAGIC);
1815 /* EXTEND() expects a signed argc; don't wrap when casting */
1816 assert(argc <= I32_MAX);
1817 EXTEND(SP, (I32)argc+1);
1818 PUSHs(SvTIED_obj(sv, mg));
1819 if (flags & G_UNDEF_FILL) {
1821 PUSHs(&PL_sv_undef);
1823 } else if (argc > 0) {
1825 va_start(args, argc);
1828 SV *const sv = va_arg(args, SV *);
1835 if (flags & G_DISCARD) {
1836 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1839 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1840 ret = *PL_stack_sp--;
1843 if (flags & G_WRITING_TO_STDERR)
1849 /* wrapper for magic_methcall that creates the first arg */
1852 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1857 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1860 if (mg->mg_len >= 0) {
1861 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1863 else if (mg->mg_len == HEf_SVKEY)
1864 arg1 = MUTABLE_SV(mg->mg_ptr);
1866 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1867 arg1 = newSViv((IV)(mg->mg_len));
1871 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1873 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1877 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
1881 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1883 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1890 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1892 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1894 if (mg->mg_type == PERL_MAGIC_tiedelem)
1895 mg->mg_flags |= MGf_GSKIP;
1896 magic_methpack(sv,mg,SV_CONST(FETCH));
1901 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1906 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1908 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1909 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1910 * public flags indicate its value based on copying from $val. Doing
1911 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1912 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1913 * wrong if $val happened to be tainted, as sv hasn't got magic
1914 * enabled, even though taint magic is in the chain. In which case,
1915 * fake up a temporary tainted value (this is easier than temporarily
1916 * re-enabling magic on sv). */
1918 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
1919 && (tmg->mg_len & 1))
1921 val = sv_mortalcopy(sv);
1927 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
1932 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1934 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1936 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1937 return magic_methpack(sv,mg,SV_CONST(DELETE));
1942 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1947 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1949 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
1951 retval = SvIV(retsv)-1;
1953 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1955 return (U32) retval;
1959 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1961 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1963 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
1968 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1972 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1974 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1975 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
1982 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1984 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1986 return magic_methpack(sv,mg,SV_CONST(EXISTS));
1990 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1993 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1994 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1996 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1998 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2000 if (HvEITER_get(hv))
2001 /* we are in an iteration so the hash cannot be empty */
2003 /* no xhv_eiter so now use FIRSTKEY */
2004 key = sv_newmortal();
2005 magic_nextpack(MUTABLE_SV(hv), mg, key);
2006 HvEITER_set(hv, NULL); /* need to reset iterator */
2007 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2010 /* there is a SCALAR method that we can call */
2011 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2013 retval = &PL_sv_undef;
2018 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2022 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2024 /* The magic ptr/len for the debugger's hash should always be an SV. */
2025 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2026 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
2027 (IV)mg->mg_len, mg->mg_ptr);
2030 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2031 setting/clearing debugger breakpoints is not a hot path. */
2032 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2033 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2035 if (svp && SvIOKp(*svp)) {
2036 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2038 #ifdef PERL_DEBUG_READONLY_OPS
2039 Slab_to_rw(OpSLAB(o));
2041 /* set or clear breakpoint in the relevant control op */
2043 o->op_flags |= OPf_SPECIAL;
2045 o->op_flags &= ~OPf_SPECIAL;
2046 #ifdef PERL_DEBUG_READONLY_OPS
2047 Slab_to_ro(OpSLAB(o));
2055 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2057 AV * const obj = MUTABLE_AV(mg->mg_obj);
2059 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2062 sv_setiv(sv, AvFILL(obj));
2070 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2072 AV * const obj = MUTABLE_AV(mg->mg_obj);
2074 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2077 av_fill(obj, SvIV(sv));
2079 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2080 "Attempt to set length of freed array");
2086 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2088 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2089 PERL_UNUSED_ARG(sv);
2090 PERL_UNUSED_CONTEXT;
2092 /* Reset the iterator when the array is cleared */
2093 #if IVSIZE == I32SIZE
2094 *((IV *) &(mg->mg_len)) = 0;
2097 *((IV *) mg->mg_ptr) = 0;
2104 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2106 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2107 PERL_UNUSED_ARG(sv);
2109 /* during global destruction, mg_obj may already have been freed */
2110 if (PL_in_clean_all)
2113 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2116 /* arylen scalar holds a pointer back to the array, but doesn't own a
2117 reference. Hence the we (the array) are about to go away with it
2118 still pointing at us. Clear its pointer, else it would be pointing
2119 at free memory. See the comment in sv_magic about reference loops,
2120 and why it can't own a reference to us. */
2127 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2129 SV* const lsv = LvTARG(sv);
2130 MAGIC * const found = mg_find_mglob(lsv);
2132 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2133 PERL_UNUSED_ARG(mg);
2135 if (found && found->mg_len != -1) {
2136 STRLEN i = found->mg_len;
2137 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2138 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2147 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2149 SV* const lsv = LvTARG(sv);
2156 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2157 PERL_UNUSED_ARG(mg);
2159 found = mg_find_mglob(lsv);
2163 found = sv_magicext_mglob(lsv);
2165 else if (!SvOK(sv)) {
2169 s = SvPV_const(lsv, len);
2174 ulen = sv_or_pv_len_utf8(lsv, s, len);
2184 else if (pos > (SSize_t)len)
2187 found->mg_len = pos;
2188 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2194 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2197 SV * const lsv = LvTARG(sv);
2198 const char * const tmps = SvPV_const(lsv,len);
2199 STRLEN offs = LvTARGOFF(sv);
2200 STRLEN rem = LvTARGLEN(sv);
2201 const bool negoff = LvFLAGS(sv) & 1;
2202 const bool negrem = LvFLAGS(sv) & 2;
2204 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2205 PERL_UNUSED_ARG(mg);
2207 if (!translate_substr_offsets(
2208 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2209 negoff ? -(IV)offs : (IV)offs, !negoff,
2210 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2212 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2218 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2219 sv_setpvn(sv, tmps + offs, rem);
2226 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2228 STRLEN len, lsv_len, oldtarglen, newtarglen;
2229 const char * const tmps = SvPV_const(sv, len);
2230 SV * const lsv = LvTARG(sv);
2231 STRLEN lvoff = LvTARGOFF(sv);
2232 STRLEN lvlen = LvTARGLEN(sv);
2233 const bool negoff = LvFLAGS(sv) & 1;
2234 const bool neglen = LvFLAGS(sv) & 2;
2236 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2237 PERL_UNUSED_ARG(mg);
2241 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2242 "Attempt to use reference as lvalue in substr"
2244 SvPV_force_nomg(lsv,lsv_len);
2245 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2246 if (!translate_substr_offsets(
2248 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2249 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2251 Perl_croak(aTHX_ "substr outside of string");
2254 sv_utf8_upgrade_nomg(lsv);
2255 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2256 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2257 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2260 else if (SvUTF8(lsv)) {
2262 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2264 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2265 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2269 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2272 if (!neglen) LvTARGLEN(sv) = newtarglen;
2273 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2279 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2281 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2282 PERL_UNUSED_ARG(sv);
2283 #ifdef NO_TAINT_SUPPORT
2284 PERL_UNUSED_ARG(mg);
2287 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2292 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2294 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2295 PERL_UNUSED_ARG(sv);
2297 /* update taint status */
2306 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2308 SV * const lsv = LvTARG(sv);
2310 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2311 PERL_UNUSED_ARG(mg);
2313 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2319 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2321 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2322 PERL_UNUSED_ARG(mg);
2323 do_vecset(sv); /* XXX slurp this routine */
2328 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2331 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2332 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2334 if (LvTARGLEN(sv)) {
2336 SV * const ahv = LvTARG(sv);
2337 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2341 else if (LvSTARGOFF(sv) >= 0) {
2342 AV *const av = MUTABLE_AV(LvTARG(sv));
2343 if (LvSTARGOFF(sv) <= AvFILL(av))
2345 if (SvRMAGICAL(av)) {
2346 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2347 targ = svp ? *svp : NULL;
2350 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2353 if (targ && (targ != &PL_sv_undef)) {
2354 /* somebody else defined it for us */
2355 SvREFCNT_dec(LvTARG(sv));
2356 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2358 SvREFCNT_dec(mg->mg_obj);
2360 mg->mg_flags &= ~MGf_REFCOUNTED;
2369 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2371 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2373 sv_setsv(sv, defelem_target(sv, mg));
2378 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2380 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2381 PERL_UNUSED_ARG(mg);
2385 sv_setsv(LvTARG(sv), sv);
2386 SvSETMAGIC(LvTARG(sv));
2392 Perl_vivify_defelem(pTHX_ SV *sv)
2397 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2399 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2402 SV * const ahv = LvTARG(sv);
2403 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2406 if (!value || value == &PL_sv_undef)
2407 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2409 else if (LvSTARGOFF(sv) < 0)
2410 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2412 AV *const av = MUTABLE_AV(LvTARG(sv));
2413 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2414 LvTARG(sv) = NULL; /* array can't be extended */
2416 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2417 if (!svp || !(value = *svp))
2418 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2421 SvREFCNT_inc_simple_void(value);
2422 SvREFCNT_dec(LvTARG(sv));
2425 SvREFCNT_dec(mg->mg_obj);
2427 mg->mg_flags &= ~MGf_REFCOUNTED;
2431 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2433 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2434 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2439 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2441 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2442 PERL_UNUSED_CONTEXT;
2443 PERL_UNUSED_ARG(sv);
2449 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2451 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2453 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2455 if (uf && uf->uf_set)
2456 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2461 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2463 const char type = mg->mg_type;
2465 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2467 assert( type == PERL_MAGIC_fm
2468 || type == PERL_MAGIC_qr
2469 || type == PERL_MAGIC_bm);
2470 return sv_unmagic(sv, type);
2473 #ifdef USE_LOCALE_COLLATE
2475 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2477 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2480 * RenE<eacute> Descartes said "I think not."
2481 * and vanished with a faint plop.
2483 PERL_UNUSED_CONTEXT;
2484 PERL_UNUSED_ARG(sv);
2486 Safefree(mg->mg_ptr);
2492 #endif /* USE_LOCALE_COLLATE */
2494 /* Just clear the UTF-8 cache data. */
2496 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2498 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2499 PERL_UNUSED_CONTEXT;
2500 PERL_UNUSED_ARG(sv);
2501 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2503 mg->mg_len = -1; /* The mg_len holds the len cache. */
2508 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2510 const char *bad = NULL;
2511 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2512 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2513 switch (mg->mg_private & OPpLVREF_TYPE) {
2515 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2519 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2523 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2527 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2531 /* diag_listed_as: Assigned value is not %s reference */
2532 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2533 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2536 SV * const old = PAD_SV(mg->mg_len);
2537 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2542 gv_setref(mg->mg_obj, sv);
2543 SvSETMAGIC(mg->mg_obj);
2546 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2547 SvREFCNT_inc_simple_NN(SvRV(sv)));
2550 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2551 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2553 if (mg->mg_flags & MGf_PERSIST)
2554 NOOP; /* This sv is in use as an iterator var and will be reused,
2555 so we must leave the magic. */
2557 /* This sv could be returned by the assignment op, so clear the
2558 magic, as lvrefs are an implementation detail that must not be
2559 leaked to the user. */
2560 sv_unmagic(sv, PERL_MAGIC_lvref);
2565 S_set_dollarzero(pTHX_ SV *sv)
2566 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2573 #ifdef HAS_SETPROCTITLE
2574 /* The BSDs don't show the argv[] in ps(1) output, they
2575 * show a string from the process struct and provide
2576 * the setproctitle() routine to manipulate that. */
2577 if (PL_origalen != 1) {
2578 s = SvPV_const(sv, len);
2579 # if __FreeBSD_version > 410001 || defined(__DragonFly__)
2580 /* The leading "-" removes the "perl: " prefix,
2581 * but not the "(perl) suffix from the ps(1)
2582 * output, because that's what ps(1) shows if the
2583 * argv[] is modified. */
2584 setproctitle("-%s", s);
2585 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2586 /* This doesn't really work if you assume that
2587 * $0 = 'foobar'; will wipe out 'perl' from the $0
2588 * because in ps(1) output the result will be like
2589 * sprintf("perl: %s (perl)", s)
2590 * I guess this is a security feature:
2591 * one (a user process) cannot get rid of the original name.
2593 setproctitle("%s", s);
2596 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2597 if (PL_origalen != 1) {
2599 s = SvPV_const(sv, len);
2600 un.pst_command = (char *)s;
2601 pstat(PSTAT_SETCMD, un, len, 0, 0);
2604 if (PL_origalen > 1) {
2606 /* PL_origalen is set in perl_parse(). */
2607 s = SvPV_force(sv,len);
2608 if (len >= (STRLEN)PL_origalen-1) {
2609 /* Longer than original, will be truncated. We assume that
2610 * PL_origalen bytes are available. */
2611 Copy(s, PL_origargv[0], PL_origalen-1, char);
2614 /* Shorter than original, will be padded. */
2616 /* Special case for Mac OS X: see [perl #38868] */
2619 /* Is the space counterintuitive? Yes.
2620 * (You were expecting \0?)
2621 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2623 const int pad = ' ';
2625 Copy(s, PL_origargv[0], len, char);
2626 PL_origargv[0][len] = 0;
2627 memset(PL_origargv[0] + len + 1,
2628 pad, PL_origalen - len - 1);
2630 PL_origargv[0][PL_origalen-1] = 0;
2631 for (i = 1; i < PL_origargc; i++)
2633 #ifdef HAS_PRCTL_SET_NAME
2634 /* Set the legacy process name in addition to the POSIX name on Linux */
2635 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2636 /* diag_listed_as: SKIPME */
2637 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2645 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2656 PERL_ARGS_ASSERT_MAGIC_SET;
2660 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2662 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2664 /* Croak with a READONLY error when a numbered match var is
2665 * set without a previous pattern match. Unless it's C<local $1>
2668 if (!PL_localizing) {
2669 Perl_croak_no_modify();
2675 switch (*mg->mg_ptr) {
2676 case '\001': /* ^A */
2677 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2678 else SvOK_off(PL_bodytarget);
2679 FmLINES(PL_bodytarget) = 0;
2680 if (SvPOK(PL_bodytarget)) {
2681 char *s = SvPVX(PL_bodytarget);
2682 while ( ((s = strchr(s, '\n'))) ) {
2683 FmLINES(PL_bodytarget)++;
2687 /* mg_set() has temporarily made sv non-magical */
2689 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2690 SvTAINTED_on(PL_bodytarget);
2692 SvTAINTED_off(PL_bodytarget);
2695 case '\003': /* ^C */
2696 PL_minus_c = cBOOL(SvIV(sv));
2699 case '\004': /* ^D */
2702 const char *s = SvPV_nolen_const(sv);
2703 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2704 if (DEBUG_x_TEST || DEBUG_B_TEST)
2705 dump_all_perl(!DEBUG_B_TEST);
2708 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2711 case '\005': /* ^E */
2712 if (*(mg->mg_ptr+1) == '\0') {
2714 set_vaxc_errno(SvIV(sv));
2717 SetLastError( SvIV(sv) );
2720 os2_setsyserrno(SvIV(sv));
2722 /* will anyone ever use this? */
2723 SETERRNO(SvIV(sv), 4);
2729 if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2730 if (PL_localizing != 2) {
2731 deprecate_fatal_in("5.28",
2732 "${^ENCODING} is no longer supported");
2736 case '\006': /* ^F */
2737 PL_maxsysfd = SvIV(sv);
2739 case '\010': /* ^H */
2741 U32 save_hints = PL_hints;
2742 PL_hints = SvUV(sv);
2744 /* If wasn't UTF-8, and now is, notify the parser */
2745 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2746 notify_parser_that_changed_to_utf8();
2750 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2751 Safefree(PL_inplace);
2752 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2754 case '\016': /* ^N */
2755 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2756 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2758 case '\017': /* ^O */
2759 if (*(mg->mg_ptr+1) == '\0') {
2760 Safefree(PL_osname);
2763 TAINT_PROPER("assigning to $^O");
2764 PL_osname = savesvpv(sv);
2767 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2769 const char *const start = SvPV(sv, len);
2770 const char *out = (const char*)memchr(start, '\0', len);
2774 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2775 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2777 /* Opening for input is more common than opening for output, so
2778 ensure that hints for input are sooner on linked list. */
2779 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2781 : newSVpvs_flags("", SvUTF8(sv));
2782 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2785 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2787 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2791 case '\020': /* ^P */
2792 PL_perldb = SvIV(sv);
2793 if (PL_perldb && !PL_DBsingle)
2796 case '\024': /* ^T */
2798 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2800 PL_basetime = (Time_t)SvIV(sv);
2803 case '\025': /* ^UTF8CACHE */
2804 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2805 PL_utf8cache = (signed char) sv_2iv(sv);
2808 case '\027': /* ^W & $^WARNING_BITS */
2809 if (*(mg->mg_ptr+1) == '\0') {
2810 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2812 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2813 | (i ? G_WARN_ON : G_WARN_OFF) ;
2816 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2817 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2819 PL_compiling.cop_warnings = pWARN_STD;
2824 int accumulate = 0 ;
2825 int any_fatals = 0 ;
2826 const char * const ptr = SvPV_const(sv, len) ;
2827 for (i = 0 ; i < len ; ++i) {
2828 accumulate |= ptr[i] ;
2829 any_fatals |= (ptr[i] & 0xAA) ;
2832 if (!specialWARN(PL_compiling.cop_warnings))
2833 PerlMemShared_free(PL_compiling.cop_warnings);
2834 PL_compiling.cop_warnings = pWARN_NONE;
2836 /* Yuck. I can't see how to abstract this: */
2838 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2842 if (!specialWARN(PL_compiling.cop_warnings))
2843 PerlMemShared_free(PL_compiling.cop_warnings);
2844 PL_compiling.cop_warnings = pWARN_ALL;
2845 PL_dowarn |= G_WARN_ONCE ;
2849 const char *const p = SvPV_const(sv, len);
2851 PL_compiling.cop_warnings
2852 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2855 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2856 PL_dowarn |= G_WARN_ONCE ;
2863 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2864 w32_sloppystat = (bool)sv_true(sv);
2869 if (PL_localizing) {
2870 if (PL_localizing == 1)
2871 SAVESPTR(PL_last_in_gv);
2873 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2874 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2877 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2878 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2879 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2882 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2883 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2884 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2887 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2890 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2891 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2892 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2895 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2899 IO * const io = GvIO(PL_defoutgv);
2902 if ((SvIV(sv)) == 0)
2903 IoFLAGS(io) &= ~IOf_FLUSH;
2905 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2906 PerlIO *ofp = IoOFP(io);
2908 (void)PerlIO_flush(ofp);
2909 IoFLAGS(io) |= IOf_FLUSH;
2918 SV *referent= SvRV(sv);
2919 const char *reftype= sv_reftype(referent, 0);
2920 /* XXX: dodgy type check: This leaves me feeling dirty, but
2921 * the alternative is to copy pretty much the entire
2922 * sv_reftype() into this routine, or to do a full string
2923 * comparison on the return of sv_reftype() both of which
2924 * make me feel worse! NOTE, do not modify this comment
2925 * without reviewing the corresponding comment in
2926 * sv_reftype(). - Yves */
2927 if (reftype[0] == 'S' || reftype[0] == 'L') {
2928 IV val= SvIV(referent);
2930 tmpsv= &PL_sv_undef;
2931 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2932 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef. This will be fatal in Perl 5.28",
2933 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2937 sv_setsv(sv, PL_rs);
2938 /* diag_listed_as: Setting $/ to %s reference is forbidden */
2939 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2940 *reftype == 'A' ? "n" : "", reftype);
2943 SvREFCNT_dec(PL_rs);
2944 PL_rs = newSVsv(tmpsv);
2948 SvREFCNT_dec(PL_ors_sv);
2950 PL_ors_sv = newSVsv(sv);
2958 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2961 #ifdef COMPLEX_STATUS
2962 if (PL_localizing == 2) {
2963 SvUPGRADE(sv, SVt_PVLV);
2964 PL_statusvalue = LvTARGOFF(sv);
2965 PL_statusvalue_vms = LvTARGLEN(sv);
2969 #ifdef VMSISH_STATUS
2971 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2974 STATUS_UNIX_EXIT_SET(SvIV(sv));
2979 # define PERL_VMS_BANG vaxc$errno
2981 # define PERL_VMS_BANG 0
2983 #if defined(WIN32) && ! defined(UNDER_CE)
2984 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2985 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2987 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2988 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2994 /* XXX $< currently silently ignores failures */
2995 const Uid_t new_uid = SvUID(sv);
2996 PL_delaymagic_uid = new_uid;
2997 if (PL_delaymagic) {
2998 PL_delaymagic |= DM_RUID;
2999 break; /* don't do magic till later */
3002 PERL_UNUSED_RESULT(setruid(new_uid));
3005 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
3007 #ifdef HAS_SETRESUID
3008 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
3010 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
3012 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
3013 if (new_uid != 0 && PerlProc_getuid() == 0)
3014 PERL_UNUSED_RESULT(PerlProc_setuid(0));
3016 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
3018 Perl_croak(aTHX_ "setruid() not implemented");
3027 /* XXX $> currently silently ignores failures */
3028 const Uid_t new_euid = SvUID(sv);
3029 PL_delaymagic_euid = new_euid;
3030 if (PL_delaymagic) {
3031 PL_delaymagic |= DM_EUID;
3032 break; /* don't do magic till later */
3035 PERL_UNUSED_RESULT(seteuid(new_euid));
3038 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
3040 #ifdef HAS_SETRESUID
3041 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
3043 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
3044 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
3046 Perl_croak(aTHX_ "seteuid() not implemented");
3055 /* XXX $( currently silently ignores failures */
3056 const Gid_t new_gid = SvGID(sv);
3057 PL_delaymagic_gid = new_gid;
3058 if (PL_delaymagic) {
3059 PL_delaymagic |= DM_RGID;
3060 break; /* don't do magic till later */
3063 PERL_UNUSED_RESULT(setrgid(new_gid));
3066 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3068 #ifdef HAS_SETRESGID
3069 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3071 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3072 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3074 Perl_croak(aTHX_ "setrgid() not implemented");
3083 /* (hv) best guess: maybe we'll need configure probes to do a better job,
3084 * but you can override it if you need to.
3087 #define INVALID_GID ((Gid_t)-1)
3089 /* XXX $) currently silently ignores failures */
3091 #ifdef HAS_SETGROUPS
3093 const char *p = SvPV_const(sv, len);
3094 Groups_t *gary = NULL;
3097 #ifdef _SC_NGROUPS_MAX
3098 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3103 int maxgrp = NGROUPS;
3108 if (grok_atoUV(p, &uv, &endptr))
3109 new_egid = (Gid_t)uv;
3111 new_egid = INVALID_GID;
3114 for (i = 0; i < maxgrp; ++i) {
3123 Newx(gary, i + 1, Groups_t);
3125 Renew(gary, i + 1, Groups_t);
3126 if (grok_atoUV(p, &uv, &endptr))
3127 gary[i] = (Groups_t)uv;
3129 gary[i] = INVALID_GID;
3134 PERL_UNUSED_RESULT(setgroups(i, gary));
3137 #else /* HAS_SETGROUPS */
3138 new_egid = SvGID(sv);
3139 #endif /* HAS_SETGROUPS */
3140 PL_delaymagic_egid = new_egid;
3141 if (PL_delaymagic) {
3142 PL_delaymagic |= DM_EGID;
3143 break; /* don't do magic till later */
3146 PERL_UNUSED_RESULT(setegid(new_egid));
3149 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3151 #ifdef HAS_SETRESGID
3152 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3154 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3155 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3157 Perl_croak(aTHX_ "setegid() not implemented");
3165 PL_chopset = SvPV_force(sv,len);
3168 /* Store the pid in mg->mg_obj so we can tell when a fork has
3169 occurred. mg->mg_obj points to *$ by default, so clear it. */
3170 if (isGV(mg->mg_obj)) {
3171 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3172 SvREFCNT_dec(mg->mg_obj);
3173 mg->mg_flags |= MGf_REFCOUNTED;
3174 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3176 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3179 LOCK_DOLLARZERO_MUTEX;
3180 S_set_dollarzero(aTHX_ sv);
3181 UNLOCK_DOLLARZERO_MUTEX;
3188 Perl_whichsig_sv(pTHX_ SV *sigsv)
3192 PERL_ARGS_ASSERT_WHICHSIG_SV;
3193 sigpv = SvPV_const(sigsv, siglen);
3194 return whichsig_pvn(sigpv, siglen);
3198 Perl_whichsig_pv(pTHX_ const char *sig)
3200 PERL_ARGS_ASSERT_WHICHSIG_PV;
3201 return whichsig_pvn(sig, strlen(sig));
3205 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3209 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3210 PERL_UNUSED_CONTEXT;
3212 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3213 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3214 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3216 if (memEQs(sig, len, "CHLD"))
3220 if (memEQs(sig, len, "CLD"))
3227 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3228 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3230 Perl_sighandler(int sig)
3233 #ifdef PERL_GET_SIG_CONTEXT
3234 dTHXa(PERL_GET_SIG_CONTEXT);
3241 SV * const tSv = PL_Sv;
3245 XPV * const tXpv = PL_Xpv;
3246 I32 old_ss_ix = PL_savestack_ix;
3247 SV *errsv_save = NULL;
3250 if (!PL_psig_ptr[sig]) {
3251 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3256 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3257 /* Max number of items pushed there is 3*n or 4. We cannot fix
3258 infinity, so we fix 4 (in fact 5): */
3259 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3261 PL_savestack_ix += 5; /* Protect save in progress. */
3262 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3265 /* sv_2cv is too complicated, try a simpler variant first: */
3266 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3267 || SvTYPE(cv) != SVt_PVCV) {
3269 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3272 if (!cv || !CvROOT(cv)) {
3273 const HEK * const hek = gv
3277 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3279 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3280 "SIG%s handler \"%" HEKf "\" not defined.\n",
3281 PL_sig_name[sig], HEKfARG(hek));
3282 /* diag_listed_as: SIG%s handler "%s" not defined */
3283 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3284 "SIG%s handler \"__ANON__\" not defined.\n",
3289 sv = PL_psig_name[sig]
3290 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3291 : newSVpv(PL_sig_name[sig],0);
3295 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3296 /* make sure our assumption about the size of the SAVEs are correct:
3297 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3298 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3301 PUSHSTACKi(PERLSI_SIGNAL);
3304 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3306 struct sigaction oact;
3308 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3311 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3312 /* The siginfo fields signo, code, errno, pid, uid,
3313 * addr, status, and band are defined by POSIX/SUSv3. */
3314 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3315 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3316 #ifdef HAS_SIGINFO_SI_ERRNO
3317 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3319 #ifdef HAS_SIGINFO_SI_STATUS
3320 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3322 #ifdef HAS_SIGINFO_SI_UID
3325 sv_setuid(uid, sip->si_uid);
3326 (void)hv_stores(sih, "uid", uid);
3329 #ifdef HAS_SIGINFO_SI_PID
3330 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3332 #ifdef HAS_SIGINFO_SI_ADDR
3333 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3335 #ifdef HAS_SIGINFO_SI_BAND
3336 (void)hv_stores(sih, "band", newSViv(sip->si_band));
3340 mPUSHp((char *)sip, sizeof(*sip));
3348 errsv_save = newSVsv(ERRSV);
3350 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3354 SV * const errsv = ERRSV;
3355 if (SvTRUE_NN(errsv)) {
3356 SvREFCNT_dec(errsv_save);
3358 /* Handler "died", for example to get out of a restart-able read().
3359 * Before we re-do that on its behalf re-enable the signal which was
3360 * blocked by the system when we entered.
3362 #ifdef HAS_SIGPROCMASK
3363 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3369 sigaddset(&set,sig);
3370 sigprocmask(SIG_UNBLOCK, &set, NULL);
3373 /* Not clear if this will work */
3374 (void)rsignal(sig, SIG_IGN);
3375 (void)rsignal(sig, PL_csighandlerp);
3377 #endif /* !PERL_MICRO */
3381 sv_setsv(errsv, errsv_save);
3382 SvREFCNT_dec(errsv_save);
3387 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3388 PL_savestack_ix = old_ss_ix;
3390 SvREFCNT_dec_NN(sv);
3391 PL_op = myop; /* Apparently not needed... */
3393 PL_Sv = tSv; /* Restore global temporaries. */
3400 S_restore_magic(pTHX_ const void *p)
3402 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3403 SV* const sv = mgs->mgs_sv;
3409 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3410 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3412 SvFLAGS(sv) |= mgs->mgs_flags;
3417 bumped = mgs->mgs_bumped;
3418 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3420 /* If we're still on top of the stack, pop us off. (That condition
3421 * will be satisfied if restore_magic was called explicitly, but *not*
3422 * if it's being called via leave_scope.)
3423 * The reason for doing this is that otherwise, things like sv_2cv()
3424 * may leave alloc gunk on the savestack, and some code
3425 * (e.g. sighandler) doesn't expect that...
3427 if (PL_savestack_ix == mgs->mgs_ss_ix)
3429 UV popval = SSPOPUV;
3430 assert(popval == SAVEt_DESTRUCTOR_X);
3431 PL_savestack_ix -= 2;
3433 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3434 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3437 if (SvREFCNT(sv) == 1) {
3438 /* We hold the last reference to this SV, which implies that the
3439 SV was deleted as a side effect of the routines we called.
3440 So artificially keep it alive a bit longer.
3441 We avoid turning on the TEMP flag, which can cause the SV's
3442 buffer to get stolen (and maybe other stuff). */
3447 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3451 /* clean up the mess created by Perl_sighandler().
3452 * Note that this is only called during an exit in a signal handler;
3453 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3457 S_unwind_handler_stack(pTHX_ const void *p)
3461 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3465 =for apidoc magic_sethint
3467 Triggered by a store to C<%^H>, records the key/value pair to
3468 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3469 anything that would need a deep copy. Maybe we should warn if we find a
3475 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3477 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3478 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3480 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3482 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3483 an alternative leaf in there, with PL_compiling.cop_hints being used if
3484 it's NULL. If needed for threads, the alternative could lock a mutex,
3485 or take other more complex action. */
3487 /* Something changed in %^H, so it will need to be restored on scope exit.
3488 Doing this here saves a lot of doing it manually in perl code (and
3489 forgetting to do it, and consequent subtle errors. */
3490 PL_hints |= HINT_LOCALIZE_HH;
3491 CopHINTHASH_set(&PL_compiling,
3492 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3497 =for apidoc magic_clearhint
3499 Triggered by a delete from C<%^H>, records the key to
3500 C<PL_compiling.cop_hints_hash>.
3505 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3507 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3508 PERL_UNUSED_ARG(sv);
3510 PL_hints |= HINT_LOCALIZE_HH;
3511 CopHINTHASH_set(&PL_compiling,
3512 mg->mg_len == HEf_SVKEY
3513 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3514 MUTABLE_SV(mg->mg_ptr), 0, 0)
3515 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3516 mg->mg_ptr, mg->mg_len, 0, 0));
3521 =for apidoc magic_clearhints
3523 Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
3528 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3530 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3531 PERL_UNUSED_ARG(sv);
3532 PERL_UNUSED_ARG(mg);
3533 cophh_free(CopHINTHASH_get(&PL_compiling));
3534 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3539 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3540 const char *name, I32 namlen)
3544 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3545 PERL_UNUSED_ARG(sv);
3546 PERL_UNUSED_ARG(name);
3547 PERL_UNUSED_ARG(namlen);
3549 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3550 nmg = mg_find(nsv, mg->mg_type);
3552 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3553 nmg->mg_ptr = mg->mg_ptr;
3554 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3555 nmg->mg_flags |= MGf_REFCOUNTED;
3560 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3561 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3563 #if DBVARMG_SINGLE != 0
3564 assert(mg->mg_private >= DBVARMG_SINGLE);
3566 assert(mg->mg_private < DBVARMG_COUNT);
3568 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3574 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3575 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3577 #if DBVARMG_SINGLE != 0
3578 assert(mg->mg_private >= DBVARMG_SINGLE);
3580 assert(mg->mg_private < DBVARMG_COUNT);
3581 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3587 * ex: set ts=8 sts=4 sw=4 et: