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<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 >= SVt_PVMG. See C<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<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 the 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 the sv is a PVMG or
291 higher. Use 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<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 type matching the SV. See C<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<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)
474 : (type == PERL_MAGIC_regdata && mg->mg_obj)
477 toLOWER(type), key, klen);
486 =for apidoc mg_localize
488 Copy some of the magic from an existing SV to new localized version of that
489 SV. Container magic (eg %ENV, $1, tie)
490 gets copied, value magic doesn't (eg
493 If setmagic is false then no set magic will be called on the new (empty) SV.
494 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
495 and that will handle the magic.
501 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
505 PERL_ARGS_ASSERT_MG_LOCALIZE;
510 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
511 const MGVTBL* const vtbl = mg->mg_virtual;
512 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
515 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
516 (void)vtbl->svt_local(aTHX_ nsv, mg);
518 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
519 mg->mg_ptr, mg->mg_len);
521 /* container types should remain read-only across localization */
522 SvFLAGS(nsv) |= SvREADONLY(sv);
525 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
526 SvFLAGS(nsv) |= SvMAGICAL(sv);
535 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
537 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
539 const MGVTBL* const vtbl = mg->mg_virtual;
540 if (vtbl && vtbl->svt_free)
541 vtbl->svt_free(aTHX_ sv, mg);
542 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
543 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
544 Safefree(mg->mg_ptr);
545 else if (mg->mg_len == HEf_SVKEY)
546 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
548 if (mg->mg_flags & MGf_REFCOUNTED)
549 SvREFCNT_dec(mg->mg_obj);
556 Free any magic storage used by the SV. See C<sv_magic>.
562 Perl_mg_free(pTHX_ SV *sv)
567 PERL_ARGS_ASSERT_MG_FREE;
569 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
570 moremagic = mg->mg_moremagic;
571 mg_free_struct(sv, mg);
572 SvMAGIC_set(sv, moremagic);
574 SvMAGIC_set(sv, NULL);
580 =for apidoc Am|void|mg_free_type|SV *sv|int how
582 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
588 Perl_mg_free_type(pTHX_ SV *sv, int how)
590 MAGIC *mg, *prevmg, *moremg;
591 PERL_ARGS_ASSERT_MG_FREE_TYPE;
592 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
594 moremg = mg->mg_moremagic;
595 if (mg->mg_type == how) {
596 /* temporarily move to the head of the magic chain, in case
597 custom free code relies on this historical aspect of mg_free */
599 prevmg->mg_moremagic = moremg;
600 mg->mg_moremagic = SvMAGIC(sv);
603 newhead = mg->mg_moremagic;
604 mg_free_struct(sv, mg);
605 SvMAGIC_set(sv, newhead);
615 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
619 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
622 const REGEXP * const rx = PM_GETRE(PL_curpm);
624 if (mg->mg_obj) { /* @+ */
625 /* return the number possible */
626 return RX_NPARENS(rx);
628 I32 paren = RX_LASTPAREN(rx);
630 /* return the last filled */
632 && (RX_OFFS(rx)[paren].start == -1
633 || RX_OFFS(rx)[paren].end == -1) )
646 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
648 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
651 const REGEXP * const rx = PM_GETRE(PL_curpm);
653 const I32 paren = mg->mg_len;
658 if (paren <= (I32)RX_NPARENS(rx) &&
659 (s = RX_OFFS(rx)[paren].start) != -1 &&
660 (t = RX_OFFS(rx)[paren].end) != -1)
663 if (mg->mg_obj) /* @+ */
668 if (RX_MATCH_UTF8(rx)) {
669 const char * const b = RX_SUBBEG(rx);
671 i = RX_SUBCOFFSET(rx) +
673 (U8*)(b-RX_SUBOFFSET(rx)+i));
688 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
690 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
694 Perl_croak_no_modify();
695 NORETURN_FUNCTION_END;
698 #define SvRTRIM(sv) STMT_START { \
700 STRLEN len = SvCUR(sv); \
701 char * const p = SvPVX(sv); \
702 while (len > 0 && isSPACE(p[len-1])) \
704 SvCUR_set(sv, len); \
710 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
712 PERL_ARGS_ASSERT_EMULATE_COP_IO;
714 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
715 sv_setsv(sv, &PL_sv_undef);
719 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
720 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
725 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
726 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
734 S_fixup_errno_string(pTHX_ SV* sv)
736 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
739 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
743 if(strEQ(SvPVX(sv), "")) {
744 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
748 /* In some locales the error string may come back as UTF-8, in which
749 * case we should turn on that flag. This didn't use to happen, and to
750 * avoid as many possible backward compatibility issues as possible, we
751 * don't turn on the flag unless we have to. So the flag stays off for
752 * an entirely invariant string. We assume that if the string looks
753 * like UTF-8, it really is UTF-8: "text in any other encoding that
754 * uses bytes with the high bit set is extremely unlikely to pass a
755 * UTF-8 validity test"
756 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
757 * potential that we will get it wrong however, especially on short
758 * error message text. (If it turns out to be necessary, we could also
759 * keep track if the current LC_MESSAGES locale is UTF-8) */
760 if (! IN_BYTES /* respect 'use bytes' */
761 && ! is_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
762 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
770 Perl__get_encoding(pTHX)
772 /* For core Perl use only: Returns the $^ENCODING or 'use encoding' in
773 * effect; NULL if none.
775 * $^ENCODING maps to PL_encoding, and is the old way to do things, and is
776 * retained for backwards compatibility. Now, there is a shadow variable
777 * ${^E_NCODING} set only by the encoding pragma, used to give this pragma
778 * lexical scope, unlike the global scope it (shudder) used to have. This
779 * variable maps to PL_lex_encoding. Again for backwards compatibility,
780 * PL_encoding has precedence over PL_lex_encoding. The hints hash is used
781 * to determine if PL_lex_encoding is in scope, and hence valid. The hints
782 * hash only accepts simple values, so we can't put an Encode object into
783 * it, so we put the object into the global, and put a simple boolean into
784 * the hints hash giving whether the global is valid or not */
793 if (! PL_lex_encoding) {
797 is_encoding = cop_hints_fetch_pvs(PL_curcop, "encoding", 0);
799 && is_encoding != &PL_sv_placeholder
800 && SvIOK(is_encoding)
801 && SvIV(is_encoding)) /* non-zero mean valid */
803 return PL_lex_encoding;
815 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
818 const char *s = NULL;
820 const char * const remaining = mg->mg_ptr + 1;
823 PERL_ARGS_ASSERT_MAGIC_GET;
827 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
829 CALLREG_NUMBUF_FETCH(rx,paren,sv);
831 sv_setsv(sv,&PL_sv_undef);
836 nextchar = *remaining;
837 switch (*mg->mg_ptr) {
838 case '\001': /* ^A */
839 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
840 else sv_setsv(sv, &PL_sv_undef);
841 if (SvTAINTED(PL_bodytarget))
844 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
845 if (nextchar == '\0') {
846 sv_setiv(sv, (IV)PL_minus_c);
848 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
849 sv_setiv(sv, (IV)STATUS_NATIVE);
853 case '\004': /* ^D */
854 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
856 case '\005': /* ^E */
857 if (nextchar != '\0') {
858 if (strEQ(remaining, "NCODING"))
859 sv_setsv(sv, _get_encoding());
860 else if (strEQ(remaining, "_NCODING"))
865 #if defined(VMS) || defined(OS2) || defined(WIN32)
869 $DESCRIPTOR(msgdsc,msg);
870 sv_setnv(sv,(NV) vaxc$errno);
871 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
872 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
877 if (!(_emx_env & 0x200)) { /* Under DOS */
878 sv_setnv(sv, (NV)errno);
879 sv_setpv(sv, errno ? my_strerror(errno) : "");
881 if (errno != errno_isOS2) {
882 const int tmp = _syserrno();
883 if (tmp) /* 2nd call to _syserrno() makes it 0 */
886 sv_setnv(sv, (NV)Perl_rc);
887 sv_setpv(sv, os2error(Perl_rc));
889 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
890 fixup_errno_string(sv);
892 # elif defined(WIN32)
894 const DWORD dwErr = GetLastError();
895 sv_setnv(sv, (NV)dwErr);
897 PerlProc_GetOSError(sv, dwErr);
898 fixup_errno_string(sv);
905 # error Missing code for platform
908 SvNOK_on(sv); /* what a wonderful hack! */
910 #endif /* End of platforms with special handling for $^E; others just fall
917 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
919 sv_setnv(sv, (NV)errno);
922 if (errno == errno_isOS2 || errno == errno_isOS2_set)
923 sv_setpv(sv, os2error(Perl_rc));
931 /* Strerror can return NULL on some platforms, which will
932 * result in 'sv' not being considered SvOK. The SvNOK_on()
933 * below will cause just the number part to be valid */
934 sv_setpv(sv, my_strerror(errno));
936 fixup_errno_string(sv);
943 SvNOK_on(sv); /* what a wonderful hack! */
946 case '\006': /* ^F */
947 sv_setiv(sv, (IV)PL_maxsysfd);
949 case '\007': /* ^GLOBAL_PHASE */
950 if (strEQ(remaining, "LOBAL_PHASE")) {
951 sv_setpvn(sv, PL_phase_names[PL_phase],
952 strlen(PL_phase_names[PL_phase]));
955 case '\010': /* ^H */
956 sv_setiv(sv, (IV)PL_hints);
958 case '\011': /* ^I */ /* NOT \t in EBCDIC */
959 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
961 case '\014': /* ^LAST_FH */
962 if (strEQ(remaining, "AST_FH")) {
964 assert(isGV_with_GP(PL_last_in_gv));
965 SV_CHECK_THINKFIRST_COW_DROP(sv);
966 prepare_SV_for_RV(sv);
968 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
972 else sv_setsv_nomg(sv, NULL);
975 case '\017': /* ^O & ^OPEN */
976 if (nextchar == '\0') {
977 sv_setpv(sv, PL_osname);
980 else if (strEQ(remaining, "PEN")) {
981 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
985 sv_setiv(sv, (IV)PL_perldb);
987 case '\023': /* ^S */
989 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
992 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
997 case '\024': /* ^T */
998 if (nextchar == '\0') {
1000 sv_setnv(sv, PL_basetime);
1002 sv_setiv(sv, (IV)PL_basetime);
1005 else if (strEQ(remaining, "AINT"))
1006 sv_setiv(sv, TAINTING_get
1007 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
1010 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
1011 if (strEQ(remaining, "NICODE"))
1012 sv_setuv(sv, (UV) PL_unicode);
1013 else if (strEQ(remaining, "TF8LOCALE"))
1014 sv_setuv(sv, (UV) PL_utf8locale);
1015 else if (strEQ(remaining, "TF8CACHE"))
1016 sv_setiv(sv, (IV) PL_utf8cache);
1018 case '\027': /* ^W & $^WARNING_BITS */
1019 if (nextchar == '\0')
1020 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
1021 else if (strEQ(remaining, "ARNING_BITS")) {
1022 if (PL_compiling.cop_warnings == pWARN_NONE) {
1023 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
1025 else if (PL_compiling.cop_warnings == pWARN_STD) {
1026 sv_setsv(sv, &PL_sv_undef);
1029 else if (PL_compiling.cop_warnings == pWARN_ALL) {
1030 /* Get the bit mask for $warnings::Bits{all}, because
1031 * it could have been extended by warnings::register */
1032 HV * const bits = get_hv("warnings::Bits", 0);
1033 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1035 sv_copypv(sv, *bits_all);
1037 sv_setpvn(sv, WARN_ALLstring, WARNsize);
1040 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1041 *PL_compiling.cop_warnings);
1046 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1047 paren = RX_LASTPAREN(rx);
1049 goto do_numbuf_fetch;
1051 sv_setsv(sv,&PL_sv_undef);
1053 case '\016': /* ^N */
1054 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1055 paren = RX_LASTCLOSEPAREN(rx);
1057 goto do_numbuf_fetch;
1059 sv_setsv(sv,&PL_sv_undef);
1062 if (GvIO(PL_last_in_gv)) {
1063 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1068 sv_setiv(sv, (IV)STATUS_CURRENT);
1069 #ifdef COMPLEX_STATUS
1070 SvUPGRADE(sv, SVt_PVLV);
1071 LvTARGOFF(sv) = PL_statusvalue;
1072 LvTARGLEN(sv) = PL_statusvalue_vms;
1077 if (GvIOp(PL_defoutgv))
1078 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1082 sv_setpv(sv,GvENAME(PL_defoutgv));
1083 sv_catpvs(sv,"_TOP");
1087 if (GvIOp(PL_defoutgv))
1088 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1090 s = GvENAME(PL_defoutgv);
1094 if (GvIO(PL_defoutgv))
1095 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1098 if (GvIO(PL_defoutgv))
1099 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1102 if (GvIO(PL_defoutgv))
1103 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1113 if (GvIO(PL_defoutgv))
1114 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1118 sv_copypv(sv, PL_ors_sv);
1120 sv_setsv(sv, &PL_sv_undef);
1124 IV const pid = (IV)PerlProc_getpid();
1125 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1126 /* never set manually, or at least not since last fork */
1128 /* never unsafe, even if reading in a tainted expression */
1131 /* else a value has been assigned manually, so do nothing */
1135 sv_setuid(sv, PerlProc_getuid());
1138 sv_setuid(sv, PerlProc_geteuid());
1141 sv_setgid(sv, PerlProc_getgid());
1144 sv_setgid(sv, PerlProc_getegid());
1146 #ifdef HAS_GETGROUPS
1148 Groups_t *gary = NULL;
1150 I32 num_groups = getgroups(0, gary);
1151 if (num_groups > 0) {
1152 Newx(gary, num_groups, Groups_t);
1153 num_groups = getgroups(num_groups, gary);
1154 for (i = 0; i < num_groups; i++)
1155 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1159 (void)SvIOK_on(sv); /* what a wonderful hack! */
1169 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1171 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1173 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1175 if (uf && uf->uf_val)
1176 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1181 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1183 STRLEN len = 0, klen;
1184 const char * const key = MgPV_const(mg,klen);
1187 PERL_ARGS_ASSERT_MAGIC_SETENV;
1191 /* defined environment variables are byte strings; unfortunately
1192 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1193 (void)SvPV_force_nomg_nolen(sv);
1194 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1196 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1202 my_setenv(key, s); /* does the deed */
1204 #ifdef DYNAMIC_ENV_FETCH
1205 /* We just undefd an environment var. Is a replacement */
1206 /* waiting in the wings? */
1208 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1210 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1214 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1215 /* And you'll never guess what the dog had */
1216 /* in its mouth... */
1218 MgTAINTEDDIR_off(mg);
1220 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
1221 char pathbuf[256], eltbuf[256], *cp, *elt;
1224 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1226 do { /* DCL$PATH may be a search list */
1227 while (1) { /* as may dev portion of any element */
1228 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1229 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1230 cando_by_name(S_IWUSR,0,elt) ) {
1231 MgTAINTEDDIR_on(mg);
1235 if ((cp = strchr(elt, ':')) != NULL)
1237 if (my_trnlnm(elt, eltbuf, j++))
1243 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1246 if (s && klen == 4 && strEQ(key,"PATH")) {
1247 const char * const strend = s + len;
1249 while (s < strend) {
1253 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1254 const char path_sep = '|';
1256 const char path_sep = ':';
1258 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1259 s, strend, path_sep, &i);
1261 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1263 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1265 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1267 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1268 MgTAINTEDDIR_on(mg);
1274 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1280 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1282 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1283 PERL_UNUSED_ARG(sv);
1284 my_setenv(MgPV_nolen_const(mg),NULL);
1289 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1291 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1292 PERL_UNUSED_ARG(mg);
1294 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1296 if (PL_localizing) {
1299 hv_iterinit(MUTABLE_HV(sv));
1300 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1302 my_setenv(hv_iterkey(entry, &keylen),
1303 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1311 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1313 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1314 PERL_UNUSED_ARG(sv);
1315 PERL_UNUSED_ARG(mg);
1317 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1325 #ifdef HAS_SIGPROCMASK
1327 restore_sigmask(pTHX_ SV *save_sv)
1329 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1330 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1334 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1336 /* Are we fetching a signal entry? */
1337 int i = (I16)mg->mg_private;
1339 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1343 const char * sig = MgPV_const(mg, siglen);
1344 mg->mg_private = i = whichsig_pvn(sig, siglen);
1349 sv_setsv(sv,PL_psig_ptr[i]);
1351 Sighandler_t sigstate = rsignal_state(i);
1352 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1353 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1356 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1357 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1360 /* cache state so we don't fetch it again */
1361 if(sigstate == (Sighandler_t) SIG_IGN)
1362 sv_setpvs(sv,"IGNORE");
1364 sv_setsv(sv,&PL_sv_undef);
1365 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1372 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1374 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1376 magic_setsig(NULL, mg);
1377 return sv_unmagic(sv, mg->mg_type);
1381 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1382 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1384 Perl_csighandler(int sig)
1387 #ifdef PERL_GET_SIG_CONTEXT
1388 dTHXa(PERL_GET_SIG_CONTEXT);
1392 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1393 #if defined(__cplusplus) && defined(__GNUC__)
1394 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1395 * parameters would be warned about. */
1396 PERL_UNUSED_ARG(sip);
1397 PERL_UNUSED_ARG(uap);
1400 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1401 (void) rsignal(sig, PL_csighandlerp);
1402 if (PL_sig_ignoring[sig]) return;
1404 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1405 if (PL_sig_defaulting[sig])
1406 #ifdef KILL_BY_SIGPRC
1407 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1422 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1423 /* Call the perl level handler now--
1424 * with risk we may be in malloc() or being destructed etc. */
1425 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1426 (*PL_sighandlerp)(sig, NULL, NULL);
1428 (*PL_sighandlerp)(sig);
1431 if (!PL_psig_pend) return;
1432 /* Set a flag to say this signal is pending, that is awaiting delivery after
1433 * the current Perl opcode completes */
1434 PL_psig_pend[sig]++;
1436 #ifndef SIG_PENDING_DIE_COUNT
1437 # define SIG_PENDING_DIE_COUNT 120
1439 /* Add one to say _a_ signal is pending */
1440 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1441 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1442 (unsigned long)SIG_PENDING_DIE_COUNT);
1446 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1448 Perl_csighandler_init(void)
1451 if (PL_sig_handlers_initted) return;
1453 for (sig = 1; sig < SIG_SIZE; sig++) {
1454 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1456 PL_sig_defaulting[sig] = 1;
1457 (void) rsignal(sig, PL_csighandlerp);
1459 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1460 PL_sig_ignoring[sig] = 0;
1463 PL_sig_handlers_initted = 1;
1467 #if defined HAS_SIGPROCMASK
1469 unblock_sigmask(pTHX_ void* newset)
1471 PERL_UNUSED_CONTEXT;
1472 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1477 Perl_despatch_signals(pTHX)
1481 for (sig = 1; sig < SIG_SIZE; sig++) {
1482 if (PL_psig_pend[sig]) {
1484 #ifdef HAS_SIGPROCMASK
1485 /* From sigaction(2) (FreeBSD man page):
1486 * | Signal routines normally execute with the signal that
1487 * | caused their invocation blocked, but other signals may
1489 * Emulation of this behavior (from within Perl) is enabled
1493 sigset_t newset, oldset;
1495 sigemptyset(&newset);
1496 sigaddset(&newset, sig);
1497 sigprocmask(SIG_BLOCK, &newset, &oldset);
1498 was_blocked = sigismember(&oldset, sig);
1500 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1502 SAVEFREESV(save_sv);
1503 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1506 PL_psig_pend[sig] = 0;
1507 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1508 (*PL_sighandlerp)(sig, NULL, NULL);
1510 (*PL_sighandlerp)(sig);
1512 #ifdef HAS_SIGPROCMASK
1521 /* sv of NULL signifies that we're acting as magic_clearsig. */
1523 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1528 /* Need to be careful with SvREFCNT_dec(), because that can have side
1529 * effects (due to closures). We must make sure that the new disposition
1530 * is in place before it is called.
1534 #ifdef HAS_SIGPROCMASK
1538 const char *s = MgPV_const(mg,len);
1540 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1543 if (memEQs(s, len, "__DIE__"))
1545 else if (memEQs(s, len, "__WARN__")
1546 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1547 /* Merge the existing behaviours, which are as follows:
1548 magic_setsig, we always set svp to &PL_warnhook
1549 (hence we always change the warnings handler)
1550 For magic_clearsig, we don't change the warnings handler if it's
1551 set to the &PL_warnhook. */
1554 SV *tmp = sv_newmortal();
1555 Perl_croak(aTHX_ "No such hook: %s",
1556 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1560 if (*svp != PERL_WARNHOOK_FATAL)
1566 i = (I16)mg->mg_private;
1568 i = whichsig_pvn(s, len); /* ...no, a brick */
1569 mg->mg_private = (U16)i;
1573 SV *tmp = sv_newmortal();
1574 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1575 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1579 #ifdef HAS_SIGPROCMASK
1580 /* Avoid having the signal arrive at a bad time, if possible. */
1583 sigprocmask(SIG_BLOCK, &set, &save);
1585 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1586 SAVEFREESV(save_sv);
1587 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1590 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1591 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1593 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1594 PL_sig_ignoring[i] = 0;
1596 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1597 PL_sig_defaulting[i] = 0;
1599 to_dec = PL_psig_ptr[i];
1601 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1602 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1604 /* Signals don't change name during the program's execution, so once
1605 they're cached in the appropriate slot of PL_psig_name, they can
1608 Ideally we'd find some way of making SVs at (C) compile time, or
1609 at least, doing most of the work. */
1610 if (!PL_psig_name[i]) {
1611 PL_psig_name[i] = newSVpvn(s, len);
1612 SvREADONLY_on(PL_psig_name[i]);
1615 SvREFCNT_dec(PL_psig_name[i]);
1616 PL_psig_name[i] = NULL;
1617 PL_psig_ptr[i] = NULL;
1620 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1622 (void)rsignal(i, PL_csighandlerp);
1625 *svp = SvREFCNT_inc_simple_NN(sv);
1627 if (sv && SvOK(sv)) {
1628 s = SvPV_force(sv, len);
1632 if (sv && memEQs(s, len,"IGNORE")) {
1634 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1635 PL_sig_ignoring[i] = 1;
1636 (void)rsignal(i, PL_csighandlerp);
1638 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1642 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1644 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1645 PL_sig_defaulting[i] = 1;
1646 (void)rsignal(i, PL_csighandlerp);
1648 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1654 * We should warn if HINT_STRICT_REFS, but without
1655 * access to a known hint bit in a known OP, we can't
1656 * tell whether HINT_STRICT_REFS is in force or not.
1658 if (!strchr(s,':') && !strchr(s,'\''))
1659 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1662 (void)rsignal(i, PL_csighandlerp);
1664 *svp = SvREFCNT_inc_simple_NN(sv);
1668 #ifdef HAS_SIGPROCMASK
1672 SvREFCNT_dec(to_dec);
1675 #endif /* !PERL_MICRO */
1678 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1680 PERL_ARGS_ASSERT_MAGIC_SETISA;
1681 PERL_UNUSED_ARG(sv);
1683 /* Skip _isaelem because _isa will handle it shortly */
1684 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1687 return magic_clearisa(NULL, mg);
1690 /* sv of NULL signifies that we're acting as magic_setisa. */
1692 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1695 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1697 /* Bail out if destruction is going on */
1698 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1701 av_clear(MUTABLE_AV(sv));
1703 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1704 /* This occurs with setisa_elem magic, which calls this
1706 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1709 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1710 SV **svp = AvARRAY((AV *)mg->mg_obj);
1711 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1713 stash = GvSTASH((GV *)*svp++);
1714 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1721 (const GV *)mg->mg_obj
1724 /* The stash may have been detached from the symbol table, so check its
1725 name before doing anything. */
1726 if (stash && HvENAME_get(stash))
1727 mro_isa_changed_in(stash);
1733 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1735 HV * const hv = MUTABLE_HV(LvTARG(sv));
1738 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1739 PERL_UNUSED_ARG(mg);
1742 (void) hv_iterinit(hv);
1743 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1746 while (hv_iternext(hv))
1751 sv_setiv(sv, (IV)i);
1756 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1758 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1759 PERL_UNUSED_ARG(mg);
1761 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1767 =for apidoc magic_methcall
1769 Invoke a magic method (like FETCH).
1771 C<sv> and C<mg> are the tied thingy and the tie magic.
1773 C<meth> is the name of the method to call.
1775 C<argc> is the number of args (in addition to $self) to pass to the method.
1777 The C<flags> can be:
1779 G_DISCARD invoke method with G_DISCARD flag and don't
1781 G_UNDEF_FILL fill the stack with argc pointers to
1784 The arguments themselves are any values following the C<flags> argument.
1786 Returns the SV (if any) returned by the method, or NULL on failure.
1793 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1799 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1803 if (flags & G_WRITING_TO_STDERR) {
1806 SAVESPTR(PL_stderrgv);
1810 PUSHSTACKi(PERLSI_MAGIC);
1814 PUSHs(SvTIED_obj(sv, mg));
1815 if (flags & G_UNDEF_FILL) {
1817 PUSHs(&PL_sv_undef);
1819 } else if (argc > 0) {
1821 va_start(args, argc);
1824 SV *const sv = va_arg(args, SV *);
1831 if (flags & G_DISCARD) {
1832 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1835 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1836 ret = *PL_stack_sp--;
1839 if (flags & G_WRITING_TO_STDERR)
1845 /* wrapper for magic_methcall that creates the first arg */
1848 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1853 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1856 if (mg->mg_len >= 0) {
1857 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1859 else if (mg->mg_len == HEf_SVKEY)
1860 arg1 = MUTABLE_SV(mg->mg_ptr);
1862 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1863 arg1 = newSViv((IV)(mg->mg_len));
1867 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1869 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1873 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
1877 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1879 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1886 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1888 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1890 if (mg->mg_type == PERL_MAGIC_tiedelem)
1891 mg->mg_flags |= MGf_GSKIP;
1892 magic_methpack(sv,mg,SV_CONST(FETCH));
1897 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1902 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1904 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1905 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1906 * public flags indicate its value based on copying from $val. Doing
1907 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1908 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1909 * wrong if $val happened to be tainted, as sv hasn't got magic
1910 * enabled, even though taint magic is in the chain. In which case,
1911 * fake up a temporary tainted value (this is easier than temporarily
1912 * re-enabling magic on sv). */
1914 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
1915 && (tmg->mg_len & 1))
1917 val = sv_mortalcopy(sv);
1923 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
1928 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1930 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1932 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1933 return magic_methpack(sv,mg,SV_CONST(DELETE));
1938 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1943 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1945 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
1947 retval = SvIV(retsv)-1;
1949 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1951 return (U32) retval;
1955 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1957 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1959 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
1964 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1968 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1970 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1971 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
1978 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1980 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1982 return magic_methpack(sv,mg,SV_CONST(EXISTS));
1986 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1989 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1990 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1992 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1994 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1996 if (HvEITER_get(hv))
1997 /* we are in an iteration so the hash cannot be empty */
1999 /* no xhv_eiter so now use FIRSTKEY */
2000 key = sv_newmortal();
2001 magic_nextpack(MUTABLE_SV(hv), mg, key);
2002 HvEITER_set(hv, NULL); /* need to reset iterator */
2003 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2006 /* there is a SCALAR method that we can call */
2007 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2009 retval = &PL_sv_undef;
2014 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2018 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2020 /* The magic ptr/len for the debugger's hash should always be an SV. */
2021 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2022 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
2023 (IV)mg->mg_len, mg->mg_ptr);
2026 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2027 setting/clearing debugger breakpoints is not a hot path. */
2028 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2029 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2031 if (svp && SvIOKp(*svp)) {
2032 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2034 #ifdef PERL_DEBUG_READONLY_OPS
2035 Slab_to_rw(OpSLAB(o));
2037 /* set or clear breakpoint in the relevant control op */
2039 o->op_flags |= OPf_SPECIAL;
2041 o->op_flags &= ~OPf_SPECIAL;
2042 #ifdef PERL_DEBUG_READONLY_OPS
2043 Slab_to_ro(OpSLAB(o));
2051 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2053 AV * const obj = MUTABLE_AV(mg->mg_obj);
2055 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2058 sv_setiv(sv, AvFILL(obj));
2066 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2068 AV * const obj = MUTABLE_AV(mg->mg_obj);
2070 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2073 av_fill(obj, SvIV(sv));
2075 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2076 "Attempt to set length of freed array");
2082 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2084 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2085 PERL_UNUSED_ARG(sv);
2086 PERL_UNUSED_CONTEXT;
2088 /* Reset the iterator when the array is cleared */
2089 #if IVSIZE == I32SIZE
2090 *((IV *) &(mg->mg_len)) = 0;
2093 *((IV *) mg->mg_ptr) = 0;
2100 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2102 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2103 PERL_UNUSED_ARG(sv);
2105 /* during global destruction, mg_obj may already have been freed */
2106 if (PL_in_clean_all)
2109 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2112 /* arylen scalar holds a pointer back to the array, but doesn't own a
2113 reference. Hence the we (the array) are about to go away with it
2114 still pointing at us. Clear its pointer, else it would be pointing
2115 at free memory. See the comment in sv_magic about reference loops,
2116 and why it can't own a reference to us. */
2123 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2125 SV* const lsv = LvTARG(sv);
2126 MAGIC * const found = mg_find_mglob(lsv);
2128 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2129 PERL_UNUSED_ARG(mg);
2131 if (found && found->mg_len != -1) {
2132 STRLEN i = found->mg_len;
2133 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2134 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2143 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2145 SV* const lsv = LvTARG(sv);
2152 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2153 PERL_UNUSED_ARG(mg);
2155 found = mg_find_mglob(lsv);
2159 found = sv_magicext_mglob(lsv);
2161 else if (!SvOK(sv)) {
2165 s = SvPV_const(lsv, len);
2170 ulen = sv_or_pv_len_utf8(lsv, s, len);
2180 else if (pos > (SSize_t)len)
2183 found->mg_len = pos;
2184 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2190 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2193 SV * const lsv = LvTARG(sv);
2194 const char * const tmps = SvPV_const(lsv,len);
2195 STRLEN offs = LvTARGOFF(sv);
2196 STRLEN rem = LvTARGLEN(sv);
2197 const bool negoff = LvFLAGS(sv) & 1;
2198 const bool negrem = LvFLAGS(sv) & 2;
2200 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2201 PERL_UNUSED_ARG(mg);
2203 if (!translate_substr_offsets(
2204 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2205 negoff ? -(IV)offs : (IV)offs, !negoff,
2206 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2208 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2209 sv_setsv_nomg(sv, &PL_sv_undef);
2214 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2215 sv_setpvn(sv, tmps + offs, rem);
2222 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2224 STRLEN len, lsv_len, oldtarglen, newtarglen;
2225 const char * const tmps = SvPV_const(sv, len);
2226 SV * const lsv = LvTARG(sv);
2227 STRLEN lvoff = LvTARGOFF(sv);
2228 STRLEN lvlen = LvTARGLEN(sv);
2229 const bool negoff = LvFLAGS(sv) & 1;
2230 const bool neglen = LvFLAGS(sv) & 2;
2232 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2233 PERL_UNUSED_ARG(mg);
2237 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2238 "Attempt to use reference as lvalue in substr"
2240 SvPV_force_nomg(lsv,lsv_len);
2241 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2242 if (!translate_substr_offsets(
2244 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2245 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2247 Perl_croak(aTHX_ "substr outside of string");
2250 sv_utf8_upgrade_nomg(lsv);
2251 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2252 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2253 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2256 else if (SvUTF8(lsv)) {
2258 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2260 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2261 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2265 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2268 if (!neglen) LvTARGLEN(sv) = newtarglen;
2269 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2275 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2277 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2278 PERL_UNUSED_ARG(sv);
2279 #ifdef NO_TAINT_SUPPORT
2280 PERL_UNUSED_ARG(mg);
2283 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2288 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2290 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2291 PERL_UNUSED_ARG(sv);
2293 /* update taint status */
2302 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2304 SV * const lsv = LvTARG(sv);
2306 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2307 PERL_UNUSED_ARG(mg);
2309 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2315 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2317 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2318 PERL_UNUSED_ARG(mg);
2319 do_vecset(sv); /* XXX slurp this routine */
2324 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2327 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2328 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2330 if (LvTARGLEN(sv)) {
2332 SV * const ahv = LvTARG(sv);
2333 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2337 else if (LvSTARGOFF(sv) >= 0) {
2338 AV *const av = MUTABLE_AV(LvTARG(sv));
2339 if (LvSTARGOFF(sv) <= AvFILL(av))
2341 if (SvRMAGICAL(av)) {
2342 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2343 targ = svp ? *svp : NULL;
2346 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2349 if (targ && (targ != &PL_sv_undef)) {
2350 /* somebody else defined it for us */
2351 SvREFCNT_dec(LvTARG(sv));
2352 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2354 SvREFCNT_dec(mg->mg_obj);
2356 mg->mg_flags &= ~MGf_REFCOUNTED;
2365 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2367 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2369 sv_setsv(sv, defelem_target(sv, mg));
2374 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2376 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2377 PERL_UNUSED_ARG(mg);
2381 sv_setsv(LvTARG(sv), sv);
2382 SvSETMAGIC(LvTARG(sv));
2388 Perl_vivify_defelem(pTHX_ SV *sv)
2393 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2395 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2398 SV * const ahv = LvTARG(sv);
2399 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2402 if (!value || value == &PL_sv_undef)
2403 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2405 else if (LvSTARGOFF(sv) < 0)
2406 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2408 AV *const av = MUTABLE_AV(LvTARG(sv));
2409 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2410 LvTARG(sv) = NULL; /* array can't be extended */
2412 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2413 if (!svp || !(value = *svp))
2414 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2417 SvREFCNT_inc_simple_void(value);
2418 SvREFCNT_dec(LvTARG(sv));
2421 SvREFCNT_dec(mg->mg_obj);
2423 mg->mg_flags &= ~MGf_REFCOUNTED;
2427 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2429 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2430 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2435 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2437 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2438 PERL_UNUSED_CONTEXT;
2439 PERL_UNUSED_ARG(sv);
2445 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2447 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2449 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2451 if (uf && uf->uf_set)
2452 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2457 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2459 const char type = mg->mg_type;
2461 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2463 if (type == PERL_MAGIC_qr) {
2464 } else if (type == PERL_MAGIC_bm) {
2468 assert(type == PERL_MAGIC_fm);
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 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2577 PERL_ARGS_ASSERT_MAGIC_SET;
2581 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2583 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2585 /* Croak with a READONLY error when a numbered match var is
2586 * set without a previous pattern match. Unless it's C<local $1>
2589 if (!PL_localizing) {
2590 Perl_croak_no_modify();
2596 switch (*mg->mg_ptr) {
2597 case '\001': /* ^A */
2598 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2599 else SvOK_off(PL_bodytarget);
2600 FmLINES(PL_bodytarget) = 0;
2601 if (SvPOK(PL_bodytarget)) {
2602 char *s = SvPVX(PL_bodytarget);
2603 while ( ((s = strchr(s, '\n'))) ) {
2604 FmLINES(PL_bodytarget)++;
2608 /* mg_set() has temporarily made sv non-magical */
2610 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2611 SvTAINTED_on(PL_bodytarget);
2613 SvTAINTED_off(PL_bodytarget);
2616 case '\003': /* ^C */
2617 PL_minus_c = cBOOL(SvIV(sv));
2620 case '\004': /* ^D */
2622 s = SvPV_nolen_const(sv);
2623 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2624 if (DEBUG_x_TEST || DEBUG_B_TEST)
2625 dump_all_perl(!DEBUG_B_TEST);
2627 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2630 case '\005': /* ^E */
2631 if (*(mg->mg_ptr+1) == '\0') {
2633 set_vaxc_errno(SvIV(sv));
2636 SetLastError( SvIV(sv) );
2639 os2_setsyserrno(SvIV(sv));
2641 /* will anyone ever use this? */
2642 SETERRNO(SvIV(sv), 4);
2648 unsigned int offset = 1;
2651 /* It may be the shadow variable ${E_NCODING} which has lexical
2652 * scope. See comments at Perl__get_encoding in this file */
2653 if (*(mg->mg_ptr + 1) == '_') {
2654 if (CopSTASH(PL_curcop) != get_hv("encoding::",0))
2655 Perl_croak_no_modify();
2659 if (strEQ(mg->mg_ptr + offset, "NCODING")) {
2660 if (lex) { /* Use the shadow global */
2661 SvREFCNT_dec(PL_lex_encoding);
2662 if (SvOK(sv) || SvGMAGICAL(sv)) {
2663 PL_lex_encoding = newSVsv(sv);
2666 PL_lex_encoding = NULL;
2669 else { /* Use the regular global */
2670 SvREFCNT_dec(PL_encoding);
2671 if (SvOK(sv) || SvGMAGICAL(sv)) {
2672 if (PL_localizing != 2) {
2673 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2674 "Setting ${^ENCODING} is deprecated");
2676 PL_encoding = newSVsv(sv);
2685 case '\006': /* ^F */
2686 PL_maxsysfd = SvIV(sv);
2688 case '\010': /* ^H */
2689 PL_hints = SvIV(sv);
2691 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2692 Safefree(PL_inplace);
2693 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2695 case '\016': /* ^N */
2696 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2697 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2699 case '\017': /* ^O */
2700 if (*(mg->mg_ptr+1) == '\0') {
2701 Safefree(PL_osname);
2704 TAINT_PROPER("assigning to $^O");
2705 PL_osname = savesvpv(sv);
2708 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2710 const char *const start = SvPV(sv, len);
2711 const char *out = (const char*)memchr(start, '\0', len);
2715 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2716 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2718 /* Opening for input is more common than opening for output, so
2719 ensure that hints for input are sooner on linked list. */
2720 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2722 : newSVpvs_flags("", SvUTF8(sv));
2723 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2726 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2728 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2732 case '\020': /* ^P */
2733 PL_perldb = SvIV(sv);
2734 if (PL_perldb && !PL_DBsingle)
2737 case '\024': /* ^T */
2739 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2741 PL_basetime = (Time_t)SvIV(sv);
2744 case '\025': /* ^UTF8CACHE */
2745 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2746 PL_utf8cache = (signed char) sv_2iv(sv);
2749 case '\027': /* ^W & $^WARNING_BITS */
2750 if (*(mg->mg_ptr+1) == '\0') {
2751 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2753 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2754 | (i ? G_WARN_ON : G_WARN_OFF) ;
2757 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2758 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2760 PL_compiling.cop_warnings = pWARN_STD;
2765 int accumulate = 0 ;
2766 int any_fatals = 0 ;
2767 const char * const ptr = SvPV_const(sv, len) ;
2768 for (i = 0 ; i < len ; ++i) {
2769 accumulate |= ptr[i] ;
2770 any_fatals |= (ptr[i] & 0xAA) ;
2773 if (!specialWARN(PL_compiling.cop_warnings))
2774 PerlMemShared_free(PL_compiling.cop_warnings);
2775 PL_compiling.cop_warnings = pWARN_NONE;
2779 const char *const p = SvPV_const(sv, len);
2781 PL_compiling.cop_warnings
2782 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2785 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2786 PL_dowarn |= G_WARN_ONCE ;
2794 if (PL_localizing) {
2795 if (PL_localizing == 1)
2796 SAVESPTR(PL_last_in_gv);
2798 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2799 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2802 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2803 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2804 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2807 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2808 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2809 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2812 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2815 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2816 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2817 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2820 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2824 IO * const io = GvIO(PL_defoutgv);
2827 if ((SvIV(sv)) == 0)
2828 IoFLAGS(io) &= ~IOf_FLUSH;
2830 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2831 PerlIO *ofp = IoOFP(io);
2833 (void)PerlIO_flush(ofp);
2834 IoFLAGS(io) |= IOf_FLUSH;
2843 SV *referent= SvRV(sv);
2844 const char *reftype= sv_reftype(referent, 0);
2845 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2846 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2847 * a full string comparison on the return of sv_reftype() both of which
2848 * make me feel worse! NOTE, do not modify this comment without reviewing the
2849 * corresponding comment in sv_reftype(). - Yves */
2850 if (reftype[0] == 'S' || reftype[0] == 'L') {
2851 IV val= SvIV(referent);
2853 tmpsv= &PL_sv_undef;
2854 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2855 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2856 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2860 /* diag_listed_as: Setting $/ to %s reference is forbidden */
2861 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2862 *reftype == 'A' ? "n" : "", reftype);
2865 SvREFCNT_dec(PL_rs);
2866 PL_rs = newSVsv(tmpsv);
2870 SvREFCNT_dec(PL_ors_sv);
2872 PL_ors_sv = newSVsv(sv);
2880 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2883 #ifdef COMPLEX_STATUS
2884 if (PL_localizing == 2) {
2885 SvUPGRADE(sv, SVt_PVLV);
2886 PL_statusvalue = LvTARGOFF(sv);
2887 PL_statusvalue_vms = LvTARGLEN(sv);
2891 #ifdef VMSISH_STATUS
2893 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2896 STATUS_UNIX_EXIT_SET(SvIV(sv));
2901 # define PERL_VMS_BANG vaxc$errno
2903 # define PERL_VMS_BANG 0
2905 #if defined(WIN32) && ! defined(UNDER_CE)
2906 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2907 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2909 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2910 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2916 /* XXX $< currently silently ignores failures */
2917 const Uid_t new_uid = SvUID(sv);
2918 PL_delaymagic_uid = new_uid;
2919 if (PL_delaymagic) {
2920 PL_delaymagic |= DM_RUID;
2921 break; /* don't do magic till later */
2924 PERL_UNUSED_RESULT(setruid(new_uid));
2927 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2929 #ifdef HAS_SETRESUID
2930 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
2932 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2934 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2935 if (new_uid != 0 && PerlProc_getuid() == 0)
2936 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2938 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
2940 Perl_croak(aTHX_ "setruid() not implemented");
2949 /* XXX $> currently silently ignores failures */
2950 const Uid_t new_euid = SvUID(sv);
2951 PL_delaymagic_euid = new_euid;
2952 if (PL_delaymagic) {
2953 PL_delaymagic |= DM_EUID;
2954 break; /* don't do magic till later */
2957 PERL_UNUSED_RESULT(seteuid(new_euid));
2960 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2962 #ifdef HAS_SETRESUID
2963 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
2965 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
2966 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
2968 Perl_croak(aTHX_ "seteuid() not implemented");
2977 /* XXX $( currently silently ignores failures */
2978 const Gid_t new_gid = SvGID(sv);
2979 PL_delaymagic_gid = new_gid;
2980 if (PL_delaymagic) {
2981 PL_delaymagic |= DM_RGID;
2982 break; /* don't do magic till later */
2985 PERL_UNUSED_RESULT(setrgid(new_gid));
2988 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2990 #ifdef HAS_SETRESGID
2991 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
2993 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
2994 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
2996 Perl_croak(aTHX_ "setrgid() not implemented");
3005 /* XXX $) currently silently ignores failures */
3007 #ifdef HAS_SETGROUPS
3009 const char *p = SvPV_const(sv, len);
3010 Groups_t *gary = NULL;
3012 #ifdef _SC_NGROUPS_MAX
3013 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3018 int maxgrp = NGROUPS;
3023 new_egid = (Gid_t)grok_atou(p, &endptr);
3024 for (i = 0; i < maxgrp; ++i) {
3033 Newx(gary, i + 1, Groups_t);
3035 Renew(gary, i + 1, Groups_t);
3036 gary[i] = (Groups_t)grok_atou(p, &endptr);
3039 PERL_UNUSED_RESULT(setgroups(i, gary));
3042 #else /* HAS_SETGROUPS */
3043 new_egid = SvGID(sv);
3044 #endif /* HAS_SETGROUPS */
3045 PL_delaymagic_egid = new_egid;
3046 if (PL_delaymagic) {
3047 PL_delaymagic |= DM_EGID;
3048 break; /* don't do magic till later */
3051 PERL_UNUSED_RESULT(setegid(new_egid));
3054 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3056 #ifdef HAS_SETRESGID
3057 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3059 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3060 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3062 Perl_croak(aTHX_ "setegid() not implemented");
3070 PL_chopset = SvPV_force(sv,len);
3073 /* Store the pid in mg->mg_obj so we can tell when a fork has
3074 occurred. mg->mg_obj points to *$ by default, so clear it. */
3075 if (isGV(mg->mg_obj)) {
3076 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3077 SvREFCNT_dec(mg->mg_obj);
3078 mg->mg_flags |= MGf_REFCOUNTED;
3079 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3081 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3084 LOCK_DOLLARZERO_MUTEX;
3085 #ifdef HAS_SETPROCTITLE
3086 /* The BSDs don't show the argv[] in ps(1) output, they
3087 * show a string from the process struct and provide
3088 * the setproctitle() routine to manipulate that. */
3089 if (PL_origalen != 1) {
3090 s = SvPV_const(sv, len);
3091 # if __FreeBSD_version > 410001
3092 /* The leading "-" removes the "perl: " prefix,
3093 * but not the "(perl) suffix from the ps(1)
3094 * output, because that's what ps(1) shows if the
3095 * argv[] is modified. */
3096 setproctitle("-%s", s);
3097 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
3098 /* This doesn't really work if you assume that
3099 * $0 = 'foobar'; will wipe out 'perl' from the $0
3100 * because in ps(1) output the result will be like
3101 * sprintf("perl: %s (perl)", s)
3102 * I guess this is a security feature:
3103 * one (a user process) cannot get rid of the original name.
3105 setproctitle("%s", s);
3108 #elif defined(__hpux) && defined(PSTAT_SETCMD)
3109 if (PL_origalen != 1) {
3111 s = SvPV_const(sv, len);
3112 un.pst_command = (char *)s;
3113 pstat(PSTAT_SETCMD, un, len, 0, 0);
3116 if (PL_origalen > 1) {
3117 /* PL_origalen is set in perl_parse(). */
3118 s = SvPV_force(sv,len);
3119 if (len >= (STRLEN)PL_origalen-1) {
3120 /* Longer than original, will be truncated. We assume that
3121 * PL_origalen bytes are available. */
3122 Copy(s, PL_origargv[0], PL_origalen-1, char);
3125 /* Shorter than original, will be padded. */
3127 /* Special case for Mac OS X: see [perl #38868] */
3130 /* Is the space counterintuitive? Yes.
3131 * (You were expecting \0?)
3132 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3134 const int pad = ' ';
3136 Copy(s, PL_origargv[0], len, char);
3137 PL_origargv[0][len] = 0;
3138 memset(PL_origargv[0] + len + 1,
3139 pad, PL_origalen - len - 1);
3141 PL_origargv[0][PL_origalen-1] = 0;
3142 for (i = 1; i < PL_origargc; i++)
3144 #ifdef HAS_PRCTL_SET_NAME
3145 /* Set the legacy process name in addition to the POSIX name on Linux */
3146 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3147 /* diag_listed_as: SKIPME */
3148 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3153 UNLOCK_DOLLARZERO_MUTEX;
3160 Perl_whichsig_sv(pTHX_ SV *sigsv)
3164 PERL_ARGS_ASSERT_WHICHSIG_SV;
3165 sigpv = SvPV_const(sigsv, siglen);
3166 return whichsig_pvn(sigpv, siglen);
3170 Perl_whichsig_pv(pTHX_ const char *sig)
3172 PERL_ARGS_ASSERT_WHICHSIG_PV;
3173 return whichsig_pvn(sig, strlen(sig));
3177 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3181 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3182 PERL_UNUSED_CONTEXT;
3184 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3185 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3186 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3188 if (memEQs(sig, len, "CHLD"))
3192 if (memEQs(sig, len, "CLD"))
3199 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3200 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3202 Perl_sighandler(int sig)
3205 #ifdef PERL_GET_SIG_CONTEXT
3206 dTHXa(PERL_GET_SIG_CONTEXT);
3213 SV * const tSv = PL_Sv;
3217 XPV * const tXpv = PL_Xpv;
3218 I32 old_ss_ix = PL_savestack_ix;
3219 SV *errsv_save = NULL;
3222 if (!PL_psig_ptr[sig]) {
3223 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3228 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3229 /* Max number of items pushed there is 3*n or 4. We cannot fix
3230 infinity, so we fix 4 (in fact 5): */
3231 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3233 PL_savestack_ix += 5; /* Protect save in progress. */
3234 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3237 /* sv_2cv is too complicated, try a simpler variant first: */
3238 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3239 || SvTYPE(cv) != SVt_PVCV) {
3241 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3244 if (!cv || !CvROOT(cv)) {
3245 const HEK * const hek = gv
3249 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3251 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3252 "SIG%s handler \"%"HEKf"\" not defined.\n",
3253 PL_sig_name[sig], hek);
3254 /* diag_listed_as: SIG%s handler "%s" not defined */
3255 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3256 "SIG%s handler \"__ANON__\" not defined.\n",
3261 sv = PL_psig_name[sig]
3262 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3263 : newSVpv(PL_sig_name[sig],0);
3267 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3268 /* make sure our assumption about the size of the SAVEs are correct:
3269 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3270 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3273 PUSHSTACKi(PERLSI_SIGNAL);
3276 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3278 struct sigaction oact;
3280 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3283 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3284 /* The siginfo fields signo, code, errno, pid, uid,
3285 * addr, status, and band are defined by POSIX/SUSv3. */
3286 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3287 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3288 #if 0 /* XXX TODO: Configure scan for the existence of these, but even that does not help if the SA_SIGINFO is not implemented according to the spec. */
3289 hv_stores(sih, "errno", newSViv(sip->si_errno));
3290 hv_stores(sih, "status", newSViv(sip->si_status));
3291 hv_stores(sih, "uid", newSViv(sip->si_uid));
3292 hv_stores(sih, "pid", newSViv(sip->si_pid));
3293 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3294 hv_stores(sih, "band", newSViv(sip->si_band));
3298 mPUSHp((char *)sip, sizeof(*sip));
3306 errsv_save = newSVsv(ERRSV);
3308 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3312 SV * const errsv = ERRSV;
3313 if (SvTRUE_NN(errsv)) {
3314 SvREFCNT_dec(errsv_save);
3316 /* Handler "died", for example to get out of a restart-able read().
3317 * Before we re-do that on its behalf re-enable the signal which was
3318 * blocked by the system when we entered.
3320 #ifdef HAS_SIGPROCMASK
3321 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3327 sigaddset(&set,sig);
3328 sigprocmask(SIG_UNBLOCK, &set, NULL);
3331 /* Not clear if this will work */
3332 (void)rsignal(sig, SIG_IGN);
3333 (void)rsignal(sig, PL_csighandlerp);
3335 #endif /* !PERL_MICRO */
3339 sv_setsv(errsv, errsv_save);
3340 SvREFCNT_dec(errsv_save);
3345 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3346 PL_savestack_ix = old_ss_ix;
3348 SvREFCNT_dec_NN(sv);
3349 PL_op = myop; /* Apparently not needed... */
3351 PL_Sv = tSv; /* Restore global temporaries. */
3358 S_restore_magic(pTHX_ const void *p)
3360 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3361 SV* const sv = mgs->mgs_sv;
3367 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3368 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3369 #ifdef PERL_OLD_COPY_ON_WRITE
3370 /* While magic was saved (and off) sv_setsv may well have seen
3371 this SV as a prime candidate for COW. */
3373 sv_force_normal_flags(sv, 0);
3376 SvFLAGS(sv) |= mgs->mgs_flags;
3381 bumped = mgs->mgs_bumped;
3382 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3384 /* If we're still on top of the stack, pop us off. (That condition
3385 * will be satisfied if restore_magic was called explicitly, but *not*
3386 * if it's being called via leave_scope.)
3387 * The reason for doing this is that otherwise, things like sv_2cv()
3388 * may leave alloc gunk on the savestack, and some code
3389 * (e.g. sighandler) doesn't expect that...
3391 if (PL_savestack_ix == mgs->mgs_ss_ix)
3393 UV popval = SSPOPUV;
3394 assert(popval == SAVEt_DESTRUCTOR_X);
3395 PL_savestack_ix -= 2;
3397 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3398 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3401 if (SvREFCNT(sv) == 1) {
3402 /* We hold the last reference to this SV, which implies that the
3403 SV was deleted as a side effect of the routines we called.
3404 So artificially keep it alive a bit longer.
3405 We avoid turning on the TEMP flag, which can cause the SV's
3406 buffer to get stolen (and maybe other stuff). */
3411 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3415 /* clean up the mess created by Perl_sighandler().
3416 * Note that this is only called during an exit in a signal handler;
3417 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3421 S_unwind_handler_stack(pTHX_ const void *p)
3425 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3429 =for apidoc magic_sethint
3431 Triggered by a store to %^H, records the key/value pair to
3432 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3433 anything that would need a deep copy. Maybe we should warn if we find a
3439 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3441 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3442 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3444 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3446 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3447 an alternative leaf in there, with PL_compiling.cop_hints being used if
3448 it's NULL. If needed for threads, the alternative could lock a mutex,
3449 or take other more complex action. */
3451 /* Something changed in %^H, so it will need to be restored on scope exit.
3452 Doing this here saves a lot of doing it manually in perl code (and
3453 forgetting to do it, and consequent subtle errors. */
3454 PL_hints |= HINT_LOCALIZE_HH;
3455 CopHINTHASH_set(&PL_compiling,
3456 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3461 =for apidoc magic_clearhint
3463 Triggered by a delete from %^H, records the key to
3464 C<PL_compiling.cop_hints_hash>.
3469 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3471 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3472 PERL_UNUSED_ARG(sv);
3474 PL_hints |= HINT_LOCALIZE_HH;
3475 CopHINTHASH_set(&PL_compiling,
3476 mg->mg_len == HEf_SVKEY
3477 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3478 MUTABLE_SV(mg->mg_ptr), 0, 0)
3479 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3480 mg->mg_ptr, mg->mg_len, 0, 0));
3485 =for apidoc magic_clearhints
3487 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3492 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3494 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3495 PERL_UNUSED_ARG(sv);
3496 PERL_UNUSED_ARG(mg);
3497 cophh_free(CopHINTHASH_get(&PL_compiling));
3498 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3503 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3504 const char *name, I32 namlen)
3508 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3509 PERL_UNUSED_ARG(sv);
3510 PERL_UNUSED_ARG(name);
3511 PERL_UNUSED_ARG(namlen);
3513 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3514 nmg = mg_find(nsv, mg->mg_type);
3516 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3517 nmg->mg_ptr = mg->mg_ptr;
3518 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3519 nmg->mg_flags |= MGf_REFCOUNTED;
3524 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3525 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3527 #if DBVARMG_SINGLE != 0
3528 assert(mg->mg_private >= DBVARMG_SINGLE);
3530 assert(mg->mg_private < DBVARMG_COUNT);
3532 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3538 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3539 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3541 #if DBVARMG_SINGLE != 0
3542 assert(mg->mg_private >= DBVARMG_SINGLE);
3544 assert(mg->mg_private < DBVARMG_COUNT);
3545 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3552 * c-indentation-style: bsd
3554 * indent-tabs-mode: nil
3557 * ex: set ts=8 sts=4 sw=4 et: