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(__cplusplus) && defined(__GNUC__)
1393 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1394 * parameters would be warned about. */
1395 PERL_UNUSED_ARG(sip);
1396 PERL_UNUSED_ARG(uap);
1398 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1399 (void) rsignal(sig, PL_csighandlerp);
1400 if (PL_sig_ignoring[sig]) return;
1402 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1403 if (PL_sig_defaulting[sig])
1404 #ifdef KILL_BY_SIGPRC
1405 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1420 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1421 /* Call the perl level handler now--
1422 * with risk we may be in malloc() or being destructed etc. */
1423 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1424 (*PL_sighandlerp)(sig, NULL, NULL);
1426 (*PL_sighandlerp)(sig);
1429 if (!PL_psig_pend) return;
1430 /* Set a flag to say this signal is pending, that is awaiting delivery after
1431 * the current Perl opcode completes */
1432 PL_psig_pend[sig]++;
1434 #ifndef SIG_PENDING_DIE_COUNT
1435 # define SIG_PENDING_DIE_COUNT 120
1437 /* Add one to say _a_ signal is pending */
1438 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1439 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1440 (unsigned long)SIG_PENDING_DIE_COUNT);
1444 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1446 Perl_csighandler_init(void)
1449 if (PL_sig_handlers_initted) return;
1451 for (sig = 1; sig < SIG_SIZE; sig++) {
1452 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1454 PL_sig_defaulting[sig] = 1;
1455 (void) rsignal(sig, PL_csighandlerp);
1457 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1458 PL_sig_ignoring[sig] = 0;
1461 PL_sig_handlers_initted = 1;
1465 #if defined HAS_SIGPROCMASK
1467 unblock_sigmask(pTHX_ void* newset)
1469 PERL_UNUSED_CONTEXT;
1470 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1475 Perl_despatch_signals(pTHX)
1479 for (sig = 1; sig < SIG_SIZE; sig++) {
1480 if (PL_psig_pend[sig]) {
1482 #ifdef HAS_SIGPROCMASK
1483 /* From sigaction(2) (FreeBSD man page):
1484 * | Signal routines normally execute with the signal that
1485 * | caused their invocation blocked, but other signals may
1487 * Emulation of this behavior (from within Perl) is enabled
1491 sigset_t newset, oldset;
1493 sigemptyset(&newset);
1494 sigaddset(&newset, sig);
1495 sigprocmask(SIG_BLOCK, &newset, &oldset);
1496 was_blocked = sigismember(&oldset, sig);
1498 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1500 SAVEFREESV(save_sv);
1501 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1504 PL_psig_pend[sig] = 0;
1505 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1506 (*PL_sighandlerp)(sig, NULL, NULL);
1508 (*PL_sighandlerp)(sig);
1510 #ifdef HAS_SIGPROCMASK
1519 /* sv of NULL signifies that we're acting as magic_clearsig. */
1521 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1526 /* Need to be careful with SvREFCNT_dec(), because that can have side
1527 * effects (due to closures). We must make sure that the new disposition
1528 * is in place before it is called.
1532 #ifdef HAS_SIGPROCMASK
1536 const char *s = MgPV_const(mg,len);
1538 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1541 if (memEQs(s, len, "__DIE__"))
1543 else if (memEQs(s, len, "__WARN__")
1544 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1545 /* Merge the existing behaviours, which are as follows:
1546 magic_setsig, we always set svp to &PL_warnhook
1547 (hence we always change the warnings handler)
1548 For magic_clearsig, we don't change the warnings handler if it's
1549 set to the &PL_warnhook. */
1552 SV *tmp = sv_newmortal();
1553 Perl_croak(aTHX_ "No such hook: %s",
1554 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1558 if (*svp != PERL_WARNHOOK_FATAL)
1564 i = (I16)mg->mg_private;
1566 i = whichsig_pvn(s, len); /* ...no, a brick */
1567 mg->mg_private = (U16)i;
1571 SV *tmp = sv_newmortal();
1572 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1573 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1577 #ifdef HAS_SIGPROCMASK
1578 /* Avoid having the signal arrive at a bad time, if possible. */
1581 sigprocmask(SIG_BLOCK, &set, &save);
1583 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1584 SAVEFREESV(save_sv);
1585 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1588 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1589 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1591 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1592 PL_sig_ignoring[i] = 0;
1594 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1595 PL_sig_defaulting[i] = 0;
1597 to_dec = PL_psig_ptr[i];
1599 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1600 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1602 /* Signals don't change name during the program's execution, so once
1603 they're cached in the appropriate slot of PL_psig_name, they can
1606 Ideally we'd find some way of making SVs at (C) compile time, or
1607 at least, doing most of the work. */
1608 if (!PL_psig_name[i]) {
1609 PL_psig_name[i] = newSVpvn(s, len);
1610 SvREADONLY_on(PL_psig_name[i]);
1613 SvREFCNT_dec(PL_psig_name[i]);
1614 PL_psig_name[i] = NULL;
1615 PL_psig_ptr[i] = NULL;
1618 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1620 (void)rsignal(i, PL_csighandlerp);
1623 *svp = SvREFCNT_inc_simple_NN(sv);
1625 if (sv && SvOK(sv)) {
1626 s = SvPV_force(sv, len);
1630 if (sv && memEQs(s, len,"IGNORE")) {
1632 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1633 PL_sig_ignoring[i] = 1;
1634 (void)rsignal(i, PL_csighandlerp);
1636 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1640 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1642 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1643 PL_sig_defaulting[i] = 1;
1644 (void)rsignal(i, PL_csighandlerp);
1646 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1652 * We should warn if HINT_STRICT_REFS, but without
1653 * access to a known hint bit in a known OP, we can't
1654 * tell whether HINT_STRICT_REFS is in force or not.
1656 if (!strchr(s,':') && !strchr(s,'\''))
1657 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1660 (void)rsignal(i, PL_csighandlerp);
1662 *svp = SvREFCNT_inc_simple_NN(sv);
1666 #ifdef HAS_SIGPROCMASK
1670 SvREFCNT_dec(to_dec);
1673 #endif /* !PERL_MICRO */
1676 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1678 PERL_ARGS_ASSERT_MAGIC_SETISA;
1679 PERL_UNUSED_ARG(sv);
1681 /* Skip _isaelem because _isa will handle it shortly */
1682 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1685 return magic_clearisa(NULL, mg);
1688 /* sv of NULL signifies that we're acting as magic_setisa. */
1690 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1693 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1695 /* Bail out if destruction is going on */
1696 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1699 av_clear(MUTABLE_AV(sv));
1701 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1702 /* This occurs with setisa_elem magic, which calls this
1704 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1707 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1708 SV **svp = AvARRAY((AV *)mg->mg_obj);
1709 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1711 stash = GvSTASH((GV *)*svp++);
1712 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1719 (const GV *)mg->mg_obj
1722 /* The stash may have been detached from the symbol table, so check its
1723 name before doing anything. */
1724 if (stash && HvENAME_get(stash))
1725 mro_isa_changed_in(stash);
1731 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1733 HV * const hv = MUTABLE_HV(LvTARG(sv));
1736 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1737 PERL_UNUSED_ARG(mg);
1740 (void) hv_iterinit(hv);
1741 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1744 while (hv_iternext(hv))
1749 sv_setiv(sv, (IV)i);
1754 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1756 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1757 PERL_UNUSED_ARG(mg);
1759 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1765 =for apidoc magic_methcall
1767 Invoke a magic method (like FETCH).
1769 C<sv> and C<mg> are the tied thingy and the tie magic.
1771 C<meth> is the name of the method to call.
1773 C<argc> is the number of args (in addition to $self) to pass to the method.
1775 The C<flags> can be:
1777 G_DISCARD invoke method with G_DISCARD flag and don't
1779 G_UNDEF_FILL fill the stack with argc pointers to
1782 The arguments themselves are any values following the C<flags> argument.
1784 Returns the SV (if any) returned by the method, or NULL on failure.
1791 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1797 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1801 if (flags & G_WRITING_TO_STDERR) {
1804 SAVESPTR(PL_stderrgv);
1808 PUSHSTACKi(PERLSI_MAGIC);
1812 PUSHs(SvTIED_obj(sv, mg));
1813 if (flags & G_UNDEF_FILL) {
1815 PUSHs(&PL_sv_undef);
1817 } else if (argc > 0) {
1819 va_start(args, argc);
1822 SV *const sv = va_arg(args, SV *);
1829 if (flags & G_DISCARD) {
1830 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1833 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1834 ret = *PL_stack_sp--;
1837 if (flags & G_WRITING_TO_STDERR)
1843 /* wrapper for magic_methcall that creates the first arg */
1846 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1851 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1854 if (mg->mg_len >= 0) {
1855 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1857 else if (mg->mg_len == HEf_SVKEY)
1858 arg1 = MUTABLE_SV(mg->mg_ptr);
1860 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1861 arg1 = newSViv((IV)(mg->mg_len));
1865 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1867 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1871 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
1875 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1877 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1884 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1886 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1888 if (mg->mg_type == PERL_MAGIC_tiedelem)
1889 mg->mg_flags |= MGf_GSKIP;
1890 magic_methpack(sv,mg,SV_CONST(FETCH));
1895 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1900 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1902 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1903 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1904 * public flags indicate its value based on copying from $val. Doing
1905 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1906 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1907 * wrong if $val happened to be tainted, as sv hasn't got magic
1908 * enabled, even though taint magic is in the chain. In which case,
1909 * fake up a temporary tainted value (this is easier than temporarily
1910 * re-enabling magic on sv). */
1912 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
1913 && (tmg->mg_len & 1))
1915 val = sv_mortalcopy(sv);
1921 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
1926 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1928 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1930 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1931 return magic_methpack(sv,mg,SV_CONST(DELETE));
1936 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1941 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1943 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
1945 retval = SvIV(retsv)-1;
1947 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1949 return (U32) retval;
1953 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1955 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1957 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
1962 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1966 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1968 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1969 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
1976 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1978 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1980 return magic_methpack(sv,mg,SV_CONST(EXISTS));
1984 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1987 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1988 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1990 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1992 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1994 if (HvEITER_get(hv))
1995 /* we are in an iteration so the hash cannot be empty */
1997 /* no xhv_eiter so now use FIRSTKEY */
1998 key = sv_newmortal();
1999 magic_nextpack(MUTABLE_SV(hv), mg, key);
2000 HvEITER_set(hv, NULL); /* need to reset iterator */
2001 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2004 /* there is a SCALAR method that we can call */
2005 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2007 retval = &PL_sv_undef;
2012 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2016 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2018 /* The magic ptr/len for the debugger's hash should always be an SV. */
2019 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2020 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
2021 (IV)mg->mg_len, mg->mg_ptr);
2024 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2025 setting/clearing debugger breakpoints is not a hot path. */
2026 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2027 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2029 if (svp && SvIOKp(*svp)) {
2030 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2032 #ifdef PERL_DEBUG_READONLY_OPS
2033 Slab_to_rw(OpSLAB(o));
2035 /* set or clear breakpoint in the relevant control op */
2037 o->op_flags |= OPf_SPECIAL;
2039 o->op_flags &= ~OPf_SPECIAL;
2040 #ifdef PERL_DEBUG_READONLY_OPS
2041 Slab_to_ro(OpSLAB(o));
2049 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2051 AV * const obj = MUTABLE_AV(mg->mg_obj);
2053 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2056 sv_setiv(sv, AvFILL(obj));
2064 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2066 AV * const obj = MUTABLE_AV(mg->mg_obj);
2068 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2071 av_fill(obj, SvIV(sv));
2073 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2074 "Attempt to set length of freed array");
2080 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2082 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2083 PERL_UNUSED_ARG(sv);
2084 PERL_UNUSED_CONTEXT;
2086 /* Reset the iterator when the array is cleared */
2087 #if IVSIZE == I32SIZE
2088 *((IV *) &(mg->mg_len)) = 0;
2091 *((IV *) mg->mg_ptr) = 0;
2098 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2100 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2101 PERL_UNUSED_ARG(sv);
2103 /* during global destruction, mg_obj may already have been freed */
2104 if (PL_in_clean_all)
2107 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2110 /* arylen scalar holds a pointer back to the array, but doesn't own a
2111 reference. Hence the we (the array) are about to go away with it
2112 still pointing at us. Clear its pointer, else it would be pointing
2113 at free memory. See the comment in sv_magic about reference loops,
2114 and why it can't own a reference to us. */
2121 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2123 SV* const lsv = LvTARG(sv);
2124 MAGIC * const found = mg_find_mglob(lsv);
2126 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2127 PERL_UNUSED_ARG(mg);
2129 if (found && found->mg_len != -1) {
2130 STRLEN i = found->mg_len;
2131 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2132 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2141 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2143 SV* const lsv = LvTARG(sv);
2150 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2151 PERL_UNUSED_ARG(mg);
2153 found = mg_find_mglob(lsv);
2157 found = sv_magicext_mglob(lsv);
2159 else if (!SvOK(sv)) {
2163 s = SvPV_const(lsv, len);
2168 ulen = sv_or_pv_len_utf8(lsv, s, len);
2178 else if (pos > (SSize_t)len)
2181 found->mg_len = pos;
2182 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2188 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2191 SV * const lsv = LvTARG(sv);
2192 const char * const tmps = SvPV_const(lsv,len);
2193 STRLEN offs = LvTARGOFF(sv);
2194 STRLEN rem = LvTARGLEN(sv);
2195 const bool negoff = LvFLAGS(sv) & 1;
2196 const bool negrem = LvFLAGS(sv) & 2;
2198 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2199 PERL_UNUSED_ARG(mg);
2201 if (!translate_substr_offsets(
2202 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2203 negoff ? -(IV)offs : (IV)offs, !negoff,
2204 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2206 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2207 sv_setsv_nomg(sv, &PL_sv_undef);
2212 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2213 sv_setpvn(sv, tmps + offs, rem);
2220 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2222 STRLEN len, lsv_len, oldtarglen, newtarglen;
2223 const char * const tmps = SvPV_const(sv, len);
2224 SV * const lsv = LvTARG(sv);
2225 STRLEN lvoff = LvTARGOFF(sv);
2226 STRLEN lvlen = LvTARGLEN(sv);
2227 const bool negoff = LvFLAGS(sv) & 1;
2228 const bool neglen = LvFLAGS(sv) & 2;
2230 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2231 PERL_UNUSED_ARG(mg);
2235 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2236 "Attempt to use reference as lvalue in substr"
2238 SvPV_force_nomg(lsv,lsv_len);
2239 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2240 if (!translate_substr_offsets(
2242 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2243 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2245 Perl_croak(aTHX_ "substr outside of string");
2248 sv_utf8_upgrade_nomg(lsv);
2249 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2250 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2251 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2254 else if (SvUTF8(lsv)) {
2256 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2258 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2259 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2263 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2266 if (!neglen) LvTARGLEN(sv) = newtarglen;
2267 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2273 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2275 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2276 PERL_UNUSED_ARG(sv);
2277 #ifdef NO_TAINT_SUPPORT
2278 PERL_UNUSED_ARG(mg);
2281 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2286 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2288 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2289 PERL_UNUSED_ARG(sv);
2291 /* update taint status */
2300 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2302 SV * const lsv = LvTARG(sv);
2304 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2305 PERL_UNUSED_ARG(mg);
2307 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2313 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2315 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2316 PERL_UNUSED_ARG(mg);
2317 do_vecset(sv); /* XXX slurp this routine */
2322 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2325 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2326 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2328 if (LvTARGLEN(sv)) {
2330 SV * const ahv = LvTARG(sv);
2331 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2335 else if (LvSTARGOFF(sv) >= 0) {
2336 AV *const av = MUTABLE_AV(LvTARG(sv));
2337 if (LvSTARGOFF(sv) <= AvFILL(av))
2339 if (SvRMAGICAL(av)) {
2340 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2341 targ = svp ? *svp : NULL;
2344 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2347 if (targ && (targ != &PL_sv_undef)) {
2348 /* somebody else defined it for us */
2349 SvREFCNT_dec(LvTARG(sv));
2350 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2352 SvREFCNT_dec(mg->mg_obj);
2354 mg->mg_flags &= ~MGf_REFCOUNTED;
2363 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2365 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2367 sv_setsv(sv, defelem_target(sv, mg));
2372 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2374 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2375 PERL_UNUSED_ARG(mg);
2379 sv_setsv(LvTARG(sv), sv);
2380 SvSETMAGIC(LvTARG(sv));
2386 Perl_vivify_defelem(pTHX_ SV *sv)
2391 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2393 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2396 SV * const ahv = LvTARG(sv);
2397 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2400 if (!value || value == &PL_sv_undef)
2401 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2403 else if (LvSTARGOFF(sv) < 0)
2404 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2406 AV *const av = MUTABLE_AV(LvTARG(sv));
2407 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2408 LvTARG(sv) = NULL; /* array can't be extended */
2410 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2411 if (!svp || !(value = *svp))
2412 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2415 SvREFCNT_inc_simple_void(value);
2416 SvREFCNT_dec(LvTARG(sv));
2419 SvREFCNT_dec(mg->mg_obj);
2421 mg->mg_flags &= ~MGf_REFCOUNTED;
2425 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2427 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2428 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2433 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2435 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2436 PERL_UNUSED_CONTEXT;
2437 PERL_UNUSED_ARG(sv);
2443 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2445 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2447 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2449 if (uf && uf->uf_set)
2450 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2455 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2457 const char type = mg->mg_type;
2459 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2461 if (type == PERL_MAGIC_qr) {
2462 } else if (type == PERL_MAGIC_bm) {
2466 assert(type == PERL_MAGIC_fm);
2468 return sv_unmagic(sv, type);
2471 #ifdef USE_LOCALE_COLLATE
2473 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2475 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2478 * RenE<eacute> Descartes said "I think not."
2479 * and vanished with a faint plop.
2481 PERL_UNUSED_CONTEXT;
2482 PERL_UNUSED_ARG(sv);
2484 Safefree(mg->mg_ptr);
2490 #endif /* USE_LOCALE_COLLATE */
2492 /* Just clear the UTF-8 cache data. */
2494 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2496 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2497 PERL_UNUSED_CONTEXT;
2498 PERL_UNUSED_ARG(sv);
2499 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2501 mg->mg_len = -1; /* The mg_len holds the len cache. */
2506 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2508 const char *bad = NULL;
2509 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2510 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2511 switch (mg->mg_private & OPpLVREF_TYPE) {
2513 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2517 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2521 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2525 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2529 /* diag_listed_as: Assigned value is not %s reference */
2530 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2531 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2534 SV * const old = PAD_SV(mg->mg_len);
2535 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2540 gv_setref(mg->mg_obj, sv);
2541 SvSETMAGIC(mg->mg_obj);
2544 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2545 SvREFCNT_inc_simple_NN(SvRV(sv)));
2548 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2549 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2551 if (mg->mg_flags & MGf_PERSIST)
2552 NOOP; /* This sv is in use as an iterator var and will be reused,
2553 so we must leave the magic. */
2555 /* This sv could be returned by the assignment op, so clear the
2556 magic, as lvrefs are an implementation detail that must not be
2557 leaked to the user. */
2558 sv_unmagic(sv, PERL_MAGIC_lvref);
2563 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2575 PERL_ARGS_ASSERT_MAGIC_SET;
2579 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2581 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2583 /* Croak with a READONLY error when a numbered match var is
2584 * set without a previous pattern match. Unless it's C<local $1>
2587 if (!PL_localizing) {
2588 Perl_croak_no_modify();
2594 switch (*mg->mg_ptr) {
2595 case '\001': /* ^A */
2596 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2597 else SvOK_off(PL_bodytarget);
2598 FmLINES(PL_bodytarget) = 0;
2599 if (SvPOK(PL_bodytarget)) {
2600 char *s = SvPVX(PL_bodytarget);
2601 while ( ((s = strchr(s, '\n'))) ) {
2602 FmLINES(PL_bodytarget)++;
2606 /* mg_set() has temporarily made sv non-magical */
2608 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2609 SvTAINTED_on(PL_bodytarget);
2611 SvTAINTED_off(PL_bodytarget);
2614 case '\003': /* ^C */
2615 PL_minus_c = cBOOL(SvIV(sv));
2618 case '\004': /* ^D */
2620 s = SvPV_nolen_const(sv);
2621 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2622 if (DEBUG_x_TEST || DEBUG_B_TEST)
2623 dump_all_perl(!DEBUG_B_TEST);
2625 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2628 case '\005': /* ^E */
2629 if (*(mg->mg_ptr+1) == '\0') {
2631 set_vaxc_errno(SvIV(sv));
2634 SetLastError( SvIV(sv) );
2637 os2_setsyserrno(SvIV(sv));
2639 /* will anyone ever use this? */
2640 SETERRNO(SvIV(sv), 4);
2646 unsigned int offset = 1;
2649 /* It may be the shadow variable ${E_NCODING} which has lexical
2650 * scope. See comments at Perl__get_encoding in this file */
2651 if (*(mg->mg_ptr + 1) == '_') {
2652 if (CopSTASH(PL_curcop) != get_hv("encoding::",0))
2653 Perl_croak_no_modify();
2657 if (strEQ(mg->mg_ptr + offset, "NCODING")) {
2658 if (lex) { /* Use the shadow global */
2659 SvREFCNT_dec(PL_lex_encoding);
2660 if (SvOK(sv) || SvGMAGICAL(sv)) {
2661 PL_lex_encoding = newSVsv(sv);
2664 PL_lex_encoding = NULL;
2667 else { /* Use the regular global */
2668 SvREFCNT_dec(PL_encoding);
2669 if (SvOK(sv) || SvGMAGICAL(sv)) {
2670 if (PL_localizing != 2) {
2671 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2672 "Setting ${^ENCODING} is deprecated");
2674 PL_encoding = newSVsv(sv);
2683 case '\006': /* ^F */
2684 PL_maxsysfd = SvIV(sv);
2686 case '\010': /* ^H */
2687 PL_hints = SvIV(sv);
2689 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2690 Safefree(PL_inplace);
2691 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2693 case '\016': /* ^N */
2694 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2695 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2697 case '\017': /* ^O */
2698 if (*(mg->mg_ptr+1) == '\0') {
2699 Safefree(PL_osname);
2702 TAINT_PROPER("assigning to $^O");
2703 PL_osname = savesvpv(sv);
2706 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2708 const char *const start = SvPV(sv, len);
2709 const char *out = (const char*)memchr(start, '\0', len);
2713 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2714 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2716 /* Opening for input is more common than opening for output, so
2717 ensure that hints for input are sooner on linked list. */
2718 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2720 : newSVpvs_flags("", SvUTF8(sv));
2721 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2724 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2726 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2730 case '\020': /* ^P */
2731 PL_perldb = SvIV(sv);
2732 if (PL_perldb && !PL_DBsingle)
2735 case '\024': /* ^T */
2737 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2739 PL_basetime = (Time_t)SvIV(sv);
2742 case '\025': /* ^UTF8CACHE */
2743 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2744 PL_utf8cache = (signed char) sv_2iv(sv);
2747 case '\027': /* ^W & $^WARNING_BITS */
2748 if (*(mg->mg_ptr+1) == '\0') {
2749 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2751 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2752 | (i ? G_WARN_ON : G_WARN_OFF) ;
2755 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2756 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2758 PL_compiling.cop_warnings = pWARN_STD;
2763 int accumulate = 0 ;
2764 int any_fatals = 0 ;
2765 const char * const ptr = SvPV_const(sv, len) ;
2766 for (i = 0 ; i < len ; ++i) {
2767 accumulate |= ptr[i] ;
2768 any_fatals |= (ptr[i] & 0xAA) ;
2771 if (!specialWARN(PL_compiling.cop_warnings))
2772 PerlMemShared_free(PL_compiling.cop_warnings);
2773 PL_compiling.cop_warnings = pWARN_NONE;
2775 /* Yuck. I can't see how to abstract this: */
2777 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2781 if (!specialWARN(PL_compiling.cop_warnings))
2782 PerlMemShared_free(PL_compiling.cop_warnings);
2783 PL_compiling.cop_warnings = pWARN_ALL;
2784 PL_dowarn |= G_WARN_ONCE ;
2788 const char *const p = SvPV_const(sv, len);
2790 PL_compiling.cop_warnings
2791 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2794 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2795 PL_dowarn |= G_WARN_ONCE ;
2803 if (PL_localizing) {
2804 if (PL_localizing == 1)
2805 SAVESPTR(PL_last_in_gv);
2807 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2808 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2811 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2812 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2813 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2816 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2817 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2818 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2821 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2824 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2825 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2826 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2829 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2833 IO * const io = GvIO(PL_defoutgv);
2836 if ((SvIV(sv)) == 0)
2837 IoFLAGS(io) &= ~IOf_FLUSH;
2839 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2840 PerlIO *ofp = IoOFP(io);
2842 (void)PerlIO_flush(ofp);
2843 IoFLAGS(io) |= IOf_FLUSH;
2852 SV *referent= SvRV(sv);
2853 const char *reftype= sv_reftype(referent, 0);
2854 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2855 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2856 * a full string comparison on the return of sv_reftype() both of which
2857 * make me feel worse! NOTE, do not modify this comment without reviewing the
2858 * corresponding comment in sv_reftype(). - Yves */
2859 if (reftype[0] == 'S' || reftype[0] == 'L') {
2860 IV val= SvIV(referent);
2862 tmpsv= &PL_sv_undef;
2863 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2864 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2865 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2869 /* diag_listed_as: Setting $/ to %s reference is forbidden */
2870 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2871 *reftype == 'A' ? "n" : "", reftype);
2874 SvREFCNT_dec(PL_rs);
2875 PL_rs = newSVsv(tmpsv);
2879 SvREFCNT_dec(PL_ors_sv);
2881 PL_ors_sv = newSVsv(sv);
2889 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2892 #ifdef COMPLEX_STATUS
2893 if (PL_localizing == 2) {
2894 SvUPGRADE(sv, SVt_PVLV);
2895 PL_statusvalue = LvTARGOFF(sv);
2896 PL_statusvalue_vms = LvTARGLEN(sv);
2900 #ifdef VMSISH_STATUS
2902 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2905 STATUS_UNIX_EXIT_SET(SvIV(sv));
2910 # define PERL_VMS_BANG vaxc$errno
2912 # define PERL_VMS_BANG 0
2914 #if defined(WIN32) && ! defined(UNDER_CE)
2915 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2916 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2918 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2919 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2925 /* XXX $< currently silently ignores failures */
2926 const Uid_t new_uid = SvUID(sv);
2927 PL_delaymagic_uid = new_uid;
2928 if (PL_delaymagic) {
2929 PL_delaymagic |= DM_RUID;
2930 break; /* don't do magic till later */
2933 PERL_UNUSED_RESULT(setruid(new_uid));
2936 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2938 #ifdef HAS_SETRESUID
2939 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
2941 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2943 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2944 if (new_uid != 0 && PerlProc_getuid() == 0)
2945 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2947 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
2949 Perl_croak(aTHX_ "setruid() not implemented");
2958 /* XXX $> currently silently ignores failures */
2959 const Uid_t new_euid = SvUID(sv);
2960 PL_delaymagic_euid = new_euid;
2961 if (PL_delaymagic) {
2962 PL_delaymagic |= DM_EUID;
2963 break; /* don't do magic till later */
2966 PERL_UNUSED_RESULT(seteuid(new_euid));
2969 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2971 #ifdef HAS_SETRESUID
2972 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
2974 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
2975 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
2977 Perl_croak(aTHX_ "seteuid() not implemented");
2986 /* XXX $( currently silently ignores failures */
2987 const Gid_t new_gid = SvGID(sv);
2988 PL_delaymagic_gid = new_gid;
2989 if (PL_delaymagic) {
2990 PL_delaymagic |= DM_RGID;
2991 break; /* don't do magic till later */
2994 PERL_UNUSED_RESULT(setrgid(new_gid));
2997 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2999 #ifdef HAS_SETRESGID
3000 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3002 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3003 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3005 Perl_croak(aTHX_ "setrgid() not implemented");
3014 /* XXX $) currently silently ignores failures */
3016 #ifdef HAS_SETGROUPS
3018 const char *p = SvPV_const(sv, len);
3019 Groups_t *gary = NULL;
3021 #ifdef _SC_NGROUPS_MAX
3022 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3027 int maxgrp = NGROUPS;
3032 new_egid = (Gid_t)grok_atou(p, &endptr);
3033 for (i = 0; i < maxgrp; ++i) {
3042 Newx(gary, i + 1, Groups_t);
3044 Renew(gary, i + 1, Groups_t);
3045 gary[i] = (Groups_t)grok_atou(p, &endptr);
3048 PERL_UNUSED_RESULT(setgroups(i, gary));
3051 #else /* HAS_SETGROUPS */
3052 new_egid = SvGID(sv);
3053 #endif /* HAS_SETGROUPS */
3054 PL_delaymagic_egid = new_egid;
3055 if (PL_delaymagic) {
3056 PL_delaymagic |= DM_EGID;
3057 break; /* don't do magic till later */
3060 PERL_UNUSED_RESULT(setegid(new_egid));
3063 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3065 #ifdef HAS_SETRESGID
3066 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3068 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3069 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3071 Perl_croak(aTHX_ "setegid() not implemented");
3079 PL_chopset = SvPV_force(sv,len);
3082 /* Store the pid in mg->mg_obj so we can tell when a fork has
3083 occurred. mg->mg_obj points to *$ by default, so clear it. */
3084 if (isGV(mg->mg_obj)) {
3085 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3086 SvREFCNT_dec(mg->mg_obj);
3087 mg->mg_flags |= MGf_REFCOUNTED;
3088 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3090 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3093 LOCK_DOLLARZERO_MUTEX;
3094 #ifdef HAS_SETPROCTITLE
3095 /* The BSDs don't show the argv[] in ps(1) output, they
3096 * show a string from the process struct and provide
3097 * the setproctitle() routine to manipulate that. */
3098 if (PL_origalen != 1) {
3099 s = SvPV_const(sv, len);
3100 # if __FreeBSD_version > 410001
3101 /* The leading "-" removes the "perl: " prefix,
3102 * but not the "(perl) suffix from the ps(1)
3103 * output, because that's what ps(1) shows if the
3104 * argv[] is modified. */
3105 setproctitle("-%s", s);
3106 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
3107 /* This doesn't really work if you assume that
3108 * $0 = 'foobar'; will wipe out 'perl' from the $0
3109 * because in ps(1) output the result will be like
3110 * sprintf("perl: %s (perl)", s)
3111 * I guess this is a security feature:
3112 * one (a user process) cannot get rid of the original name.
3114 setproctitle("%s", s);
3117 #elif defined(__hpux) && defined(PSTAT_SETCMD)
3118 if (PL_origalen != 1) {
3120 s = SvPV_const(sv, len);
3121 un.pst_command = (char *)s;
3122 pstat(PSTAT_SETCMD, un, len, 0, 0);
3125 if (PL_origalen > 1) {
3126 /* PL_origalen is set in perl_parse(). */
3127 s = SvPV_force(sv,len);
3128 if (len >= (STRLEN)PL_origalen-1) {
3129 /* Longer than original, will be truncated. We assume that
3130 * PL_origalen bytes are available. */
3131 Copy(s, PL_origargv[0], PL_origalen-1, char);
3134 /* Shorter than original, will be padded. */
3136 /* Special case for Mac OS X: see [perl #38868] */
3139 /* Is the space counterintuitive? Yes.
3140 * (You were expecting \0?)
3141 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3143 const int pad = ' ';
3145 Copy(s, PL_origargv[0], len, char);
3146 PL_origargv[0][len] = 0;
3147 memset(PL_origargv[0] + len + 1,
3148 pad, PL_origalen - len - 1);
3150 PL_origargv[0][PL_origalen-1] = 0;
3151 for (i = 1; i < PL_origargc; i++)
3153 #ifdef HAS_PRCTL_SET_NAME
3154 /* Set the legacy process name in addition to the POSIX name on Linux */
3155 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3156 /* diag_listed_as: SKIPME */
3157 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3162 UNLOCK_DOLLARZERO_MUTEX;
3169 Perl_whichsig_sv(pTHX_ SV *sigsv)
3173 PERL_ARGS_ASSERT_WHICHSIG_SV;
3174 sigpv = SvPV_const(sigsv, siglen);
3175 return whichsig_pvn(sigpv, siglen);
3179 Perl_whichsig_pv(pTHX_ const char *sig)
3181 PERL_ARGS_ASSERT_WHICHSIG_PV;
3182 return whichsig_pvn(sig, strlen(sig));
3186 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3190 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3191 PERL_UNUSED_CONTEXT;
3193 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3194 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3195 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3197 if (memEQs(sig, len, "CHLD"))
3201 if (memEQs(sig, len, "CLD"))
3208 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3209 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3211 Perl_sighandler(int sig)
3214 #ifdef PERL_GET_SIG_CONTEXT
3215 dTHXa(PERL_GET_SIG_CONTEXT);
3222 SV * const tSv = PL_Sv;
3226 XPV * const tXpv = PL_Xpv;
3227 I32 old_ss_ix = PL_savestack_ix;
3228 SV *errsv_save = NULL;
3231 if (!PL_psig_ptr[sig]) {
3232 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3237 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3238 /* Max number of items pushed there is 3*n or 4. We cannot fix
3239 infinity, so we fix 4 (in fact 5): */
3240 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3242 PL_savestack_ix += 5; /* Protect save in progress. */
3243 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3246 /* sv_2cv is too complicated, try a simpler variant first: */
3247 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3248 || SvTYPE(cv) != SVt_PVCV) {
3250 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3253 if (!cv || !CvROOT(cv)) {
3254 const HEK * const hek = gv
3258 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3260 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3261 "SIG%s handler \"%"HEKf"\" not defined.\n",
3262 PL_sig_name[sig], hek);
3263 /* diag_listed_as: SIG%s handler "%s" not defined */
3264 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3265 "SIG%s handler \"__ANON__\" not defined.\n",
3270 sv = PL_psig_name[sig]
3271 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3272 : newSVpv(PL_sig_name[sig],0);
3276 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3277 /* make sure our assumption about the size of the SAVEs are correct:
3278 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3279 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3282 PUSHSTACKi(PERLSI_SIGNAL);
3285 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3287 struct sigaction oact;
3289 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3292 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3293 /* The siginfo fields signo, code, errno, pid, uid,
3294 * addr, status, and band are defined by POSIX/SUSv3. */
3295 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3296 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3297 #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. */
3298 hv_stores(sih, "errno", newSViv(sip->si_errno));
3299 hv_stores(sih, "status", newSViv(sip->si_status));
3300 hv_stores(sih, "uid", newSViv(sip->si_uid));
3301 hv_stores(sih, "pid", newSViv(sip->si_pid));
3302 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3303 hv_stores(sih, "band", newSViv(sip->si_band));
3307 mPUSHp((char *)sip, sizeof(*sip));
3315 errsv_save = newSVsv(ERRSV);
3317 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3321 SV * const errsv = ERRSV;
3322 if (SvTRUE_NN(errsv)) {
3323 SvREFCNT_dec(errsv_save);
3325 /* Handler "died", for example to get out of a restart-able read().
3326 * Before we re-do that on its behalf re-enable the signal which was
3327 * blocked by the system when we entered.
3329 #ifdef HAS_SIGPROCMASK
3330 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3336 sigaddset(&set,sig);
3337 sigprocmask(SIG_UNBLOCK, &set, NULL);
3340 /* Not clear if this will work */
3341 (void)rsignal(sig, SIG_IGN);
3342 (void)rsignal(sig, PL_csighandlerp);
3344 #endif /* !PERL_MICRO */
3348 sv_setsv(errsv, errsv_save);
3349 SvREFCNT_dec(errsv_save);
3354 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3355 PL_savestack_ix = old_ss_ix;
3357 SvREFCNT_dec_NN(sv);
3358 PL_op = myop; /* Apparently not needed... */
3360 PL_Sv = tSv; /* Restore global temporaries. */
3367 S_restore_magic(pTHX_ const void *p)
3369 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3370 SV* const sv = mgs->mgs_sv;
3376 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3377 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3378 #ifdef PERL_OLD_COPY_ON_WRITE
3379 /* While magic was saved (and off) sv_setsv may well have seen
3380 this SV as a prime candidate for COW. */
3382 sv_force_normal_flags(sv, 0);
3385 SvFLAGS(sv) |= mgs->mgs_flags;
3390 bumped = mgs->mgs_bumped;
3391 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3393 /* If we're still on top of the stack, pop us off. (That condition
3394 * will be satisfied if restore_magic was called explicitly, but *not*
3395 * if it's being called via leave_scope.)
3396 * The reason for doing this is that otherwise, things like sv_2cv()
3397 * may leave alloc gunk on the savestack, and some code
3398 * (e.g. sighandler) doesn't expect that...
3400 if (PL_savestack_ix == mgs->mgs_ss_ix)
3402 UV popval = SSPOPUV;
3403 assert(popval == SAVEt_DESTRUCTOR_X);
3404 PL_savestack_ix -= 2;
3406 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3407 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3410 if (SvREFCNT(sv) == 1) {
3411 /* We hold the last reference to this SV, which implies that the
3412 SV was deleted as a side effect of the routines we called.
3413 So artificially keep it alive a bit longer.
3414 We avoid turning on the TEMP flag, which can cause the SV's
3415 buffer to get stolen (and maybe other stuff). */
3420 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3424 /* clean up the mess created by Perl_sighandler().
3425 * Note that this is only called during an exit in a signal handler;
3426 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3430 S_unwind_handler_stack(pTHX_ const void *p)
3434 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3438 =for apidoc magic_sethint
3440 Triggered by a store to %^H, records the key/value pair to
3441 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3442 anything that would need a deep copy. Maybe we should warn if we find a
3448 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3450 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3451 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3453 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3455 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3456 an alternative leaf in there, with PL_compiling.cop_hints being used if
3457 it's NULL. If needed for threads, the alternative could lock a mutex,
3458 or take other more complex action. */
3460 /* Something changed in %^H, so it will need to be restored on scope exit.
3461 Doing this here saves a lot of doing it manually in perl code (and
3462 forgetting to do it, and consequent subtle errors. */
3463 PL_hints |= HINT_LOCALIZE_HH;
3464 CopHINTHASH_set(&PL_compiling,
3465 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3470 =for apidoc magic_clearhint
3472 Triggered by a delete from %^H, records the key to
3473 C<PL_compiling.cop_hints_hash>.
3478 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3480 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3481 PERL_UNUSED_ARG(sv);
3483 PL_hints |= HINT_LOCALIZE_HH;
3484 CopHINTHASH_set(&PL_compiling,
3485 mg->mg_len == HEf_SVKEY
3486 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3487 MUTABLE_SV(mg->mg_ptr), 0, 0)
3488 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3489 mg->mg_ptr, mg->mg_len, 0, 0));
3494 =for apidoc magic_clearhints
3496 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3501 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3503 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3504 PERL_UNUSED_ARG(sv);
3505 PERL_UNUSED_ARG(mg);
3506 cophh_free(CopHINTHASH_get(&PL_compiling));
3507 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3512 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3513 const char *name, I32 namlen)
3517 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3518 PERL_UNUSED_ARG(sv);
3519 PERL_UNUSED_ARG(name);
3520 PERL_UNUSED_ARG(namlen);
3522 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3523 nmg = mg_find(nsv, mg->mg_type);
3525 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3526 nmg->mg_ptr = mg->mg_ptr;
3527 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3528 nmg->mg_flags |= MGf_REFCOUNTED;
3533 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3534 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3536 #if DBVARMG_SINGLE != 0
3537 assert(mg->mg_private >= DBVARMG_SINGLE);
3539 assert(mg->mg_private < DBVARMG_COUNT);
3541 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3547 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3548 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3550 #if DBVARMG_SINGLE != 0
3551 assert(mg->mg_private >= DBVARMG_SINGLE);
3553 assert(mg->mg_private < DBVARMG_COUNT);
3554 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3561 * c-indentation-style: bsd
3563 * indent-tabs-mode: nil
3566 * ex: set ts=8 sts=4 sw=4 et: