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)));
1108 sv_setsv(sv, PL_rs);
1114 if (GvIO(PL_defoutgv))
1115 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1119 sv_copypv(sv, PL_ors_sv);
1121 sv_setsv(sv, &PL_sv_undef);
1125 IV const pid = (IV)PerlProc_getpid();
1126 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1127 /* never set manually, or at least not since last fork */
1129 /* never unsafe, even if reading in a tainted expression */
1132 /* else a value has been assigned manually, so do nothing */
1136 sv_setuid(sv, PerlProc_getuid());
1139 sv_setuid(sv, PerlProc_geteuid());
1142 sv_setgid(sv, PerlProc_getgid());
1145 sv_setgid(sv, PerlProc_getegid());
1147 #ifdef HAS_GETGROUPS
1149 Groups_t *gary = NULL;
1151 I32 num_groups = getgroups(0, gary);
1152 if (num_groups > 0) {
1153 Newx(gary, num_groups, Groups_t);
1154 num_groups = getgroups(num_groups, gary);
1155 for (i = 0; i < num_groups; i++)
1156 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1160 (void)SvIOK_on(sv); /* what a wonderful hack! */
1170 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1172 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1174 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1176 if (uf && uf->uf_val)
1177 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1182 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1184 STRLEN len = 0, klen;
1185 const char * const key = MgPV_const(mg,klen);
1188 PERL_ARGS_ASSERT_MAGIC_SETENV;
1192 /* defined environment variables are byte strings; unfortunately
1193 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1194 (void)SvPV_force_nomg_nolen(sv);
1195 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1197 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1203 my_setenv(key, s); /* does the deed */
1205 #ifdef DYNAMIC_ENV_FETCH
1206 /* We just undefd an environment var. Is a replacement */
1207 /* waiting in the wings? */
1209 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1211 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1215 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1216 /* And you'll never guess what the dog had */
1217 /* in its mouth... */
1219 MgTAINTEDDIR_off(mg);
1221 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
1222 char pathbuf[256], eltbuf[256], *cp, *elt;
1225 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1227 do { /* DCL$PATH may be a search list */
1228 while (1) { /* as may dev portion of any element */
1229 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1230 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1231 cando_by_name(S_IWUSR,0,elt) ) {
1232 MgTAINTEDDIR_on(mg);
1236 if ((cp = strchr(elt, ':')) != NULL)
1238 if (my_trnlnm(elt, eltbuf, j++))
1244 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1247 if (s && klen == 4 && strEQ(key,"PATH")) {
1248 const char * const strend = s + len;
1250 while (s < strend) {
1254 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1255 const char path_sep = '|';
1257 const char path_sep = ':';
1259 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1260 s, strend, path_sep, &i);
1262 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1264 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1266 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1268 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1269 MgTAINTEDDIR_on(mg);
1275 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1281 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1283 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1284 PERL_UNUSED_ARG(sv);
1285 my_setenv(MgPV_nolen_const(mg),NULL);
1290 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1292 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1293 PERL_UNUSED_ARG(mg);
1295 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1297 if (PL_localizing) {
1300 hv_iterinit(MUTABLE_HV(sv));
1301 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1303 my_setenv(hv_iterkey(entry, &keylen),
1304 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1312 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1314 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1315 PERL_UNUSED_ARG(sv);
1316 PERL_UNUSED_ARG(mg);
1318 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1326 #ifdef HAS_SIGPROCMASK
1328 restore_sigmask(pTHX_ SV *save_sv)
1330 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1331 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1335 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1337 /* Are we fetching a signal entry? */
1338 int i = (I16)mg->mg_private;
1340 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1344 const char * sig = MgPV_const(mg, siglen);
1345 mg->mg_private = i = whichsig_pvn(sig, siglen);
1350 sv_setsv(sv,PL_psig_ptr[i]);
1352 Sighandler_t sigstate = rsignal_state(i);
1353 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1354 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1357 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1358 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1361 /* cache state so we don't fetch it again */
1362 if(sigstate == (Sighandler_t) SIG_IGN)
1363 sv_setpvs(sv,"IGNORE");
1365 sv_setsv(sv,&PL_sv_undef);
1366 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1373 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1375 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1377 magic_setsig(NULL, mg);
1378 return sv_unmagic(sv, mg->mg_type);
1382 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1383 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1385 Perl_csighandler(int sig)
1388 #ifdef PERL_GET_SIG_CONTEXT
1389 dTHXa(PERL_GET_SIG_CONTEXT);
1393 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1394 #if defined(__cplusplus) && defined(__GNUC__)
1395 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1396 * parameters would be warned about. */
1397 PERL_UNUSED_ARG(sip);
1398 PERL_UNUSED_ARG(uap);
1401 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1402 (void) rsignal(sig, PL_csighandlerp);
1403 if (PL_sig_ignoring[sig]) return;
1405 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1406 if (PL_sig_defaulting[sig])
1407 #ifdef KILL_BY_SIGPRC
1408 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1423 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1424 /* Call the perl level handler now--
1425 * with risk we may be in malloc() or being destructed etc. */
1426 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1427 (*PL_sighandlerp)(sig, NULL, NULL);
1429 (*PL_sighandlerp)(sig);
1432 if (!PL_psig_pend) return;
1433 /* Set a flag to say this signal is pending, that is awaiting delivery after
1434 * the current Perl opcode completes */
1435 PL_psig_pend[sig]++;
1437 #ifndef SIG_PENDING_DIE_COUNT
1438 # define SIG_PENDING_DIE_COUNT 120
1440 /* Add one to say _a_ signal is pending */
1441 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1442 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1443 (unsigned long)SIG_PENDING_DIE_COUNT);
1447 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1449 Perl_csighandler_init(void)
1452 if (PL_sig_handlers_initted) return;
1454 for (sig = 1; sig < SIG_SIZE; sig++) {
1455 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1457 PL_sig_defaulting[sig] = 1;
1458 (void) rsignal(sig, PL_csighandlerp);
1460 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1461 PL_sig_ignoring[sig] = 0;
1464 PL_sig_handlers_initted = 1;
1468 #if defined HAS_SIGPROCMASK
1470 unblock_sigmask(pTHX_ void* newset)
1472 PERL_UNUSED_CONTEXT;
1473 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1478 Perl_despatch_signals(pTHX)
1482 for (sig = 1; sig < SIG_SIZE; sig++) {
1483 if (PL_psig_pend[sig]) {
1485 #ifdef HAS_SIGPROCMASK
1486 /* From sigaction(2) (FreeBSD man page):
1487 * | Signal routines normally execute with the signal that
1488 * | caused their invocation blocked, but other signals may
1490 * Emulation of this behavior (from within Perl) is enabled
1494 sigset_t newset, oldset;
1496 sigemptyset(&newset);
1497 sigaddset(&newset, sig);
1498 sigprocmask(SIG_BLOCK, &newset, &oldset);
1499 was_blocked = sigismember(&oldset, sig);
1501 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1503 SAVEFREESV(save_sv);
1504 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1507 PL_psig_pend[sig] = 0;
1508 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1509 (*PL_sighandlerp)(sig, NULL, NULL);
1511 (*PL_sighandlerp)(sig);
1513 #ifdef HAS_SIGPROCMASK
1522 /* sv of NULL signifies that we're acting as magic_clearsig. */
1524 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1529 /* Need to be careful with SvREFCNT_dec(), because that can have side
1530 * effects (due to closures). We must make sure that the new disposition
1531 * is in place before it is called.
1535 #ifdef HAS_SIGPROCMASK
1539 const char *s = MgPV_const(mg,len);
1541 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1544 if (memEQs(s, len, "__DIE__"))
1546 else if (memEQs(s, len, "__WARN__")
1547 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1548 /* Merge the existing behaviours, which are as follows:
1549 magic_setsig, we always set svp to &PL_warnhook
1550 (hence we always change the warnings handler)
1551 For magic_clearsig, we don't change the warnings handler if it's
1552 set to the &PL_warnhook. */
1555 SV *tmp = sv_newmortal();
1556 Perl_croak(aTHX_ "No such hook: %s",
1557 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1561 if (*svp != PERL_WARNHOOK_FATAL)
1567 i = (I16)mg->mg_private;
1569 i = whichsig_pvn(s, len); /* ...no, a brick */
1570 mg->mg_private = (U16)i;
1574 SV *tmp = sv_newmortal();
1575 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1576 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1580 #ifdef HAS_SIGPROCMASK
1581 /* Avoid having the signal arrive at a bad time, if possible. */
1584 sigprocmask(SIG_BLOCK, &set, &save);
1586 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1587 SAVEFREESV(save_sv);
1588 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1591 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1592 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1594 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1595 PL_sig_ignoring[i] = 0;
1597 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1598 PL_sig_defaulting[i] = 0;
1600 to_dec = PL_psig_ptr[i];
1602 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1603 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1605 /* Signals don't change name during the program's execution, so once
1606 they're cached in the appropriate slot of PL_psig_name, they can
1609 Ideally we'd find some way of making SVs at (C) compile time, or
1610 at least, doing most of the work. */
1611 if (!PL_psig_name[i]) {
1612 PL_psig_name[i] = newSVpvn(s, len);
1613 SvREADONLY_on(PL_psig_name[i]);
1616 SvREFCNT_dec(PL_psig_name[i]);
1617 PL_psig_name[i] = NULL;
1618 PL_psig_ptr[i] = NULL;
1621 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1623 (void)rsignal(i, PL_csighandlerp);
1626 *svp = SvREFCNT_inc_simple_NN(sv);
1628 if (sv && SvOK(sv)) {
1629 s = SvPV_force(sv, len);
1633 if (sv && memEQs(s, len,"IGNORE")) {
1635 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1636 PL_sig_ignoring[i] = 1;
1637 (void)rsignal(i, PL_csighandlerp);
1639 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1643 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1645 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1646 PL_sig_defaulting[i] = 1;
1647 (void)rsignal(i, PL_csighandlerp);
1649 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1655 * We should warn if HINT_STRICT_REFS, but without
1656 * access to a known hint bit in a known OP, we can't
1657 * tell whether HINT_STRICT_REFS is in force or not.
1659 if (!strchr(s,':') && !strchr(s,'\''))
1660 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1663 (void)rsignal(i, PL_csighandlerp);
1665 *svp = SvREFCNT_inc_simple_NN(sv);
1669 #ifdef HAS_SIGPROCMASK
1673 SvREFCNT_dec(to_dec);
1676 #endif /* !PERL_MICRO */
1679 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1681 PERL_ARGS_ASSERT_MAGIC_SETISA;
1682 PERL_UNUSED_ARG(sv);
1684 /* Skip _isaelem because _isa will handle it shortly */
1685 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1688 return magic_clearisa(NULL, mg);
1691 /* sv of NULL signifies that we're acting as magic_setisa. */
1693 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1696 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1698 /* Bail out if destruction is going on */
1699 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1702 av_clear(MUTABLE_AV(sv));
1704 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1705 /* This occurs with setisa_elem magic, which calls this
1707 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1710 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1711 SV **svp = AvARRAY((AV *)mg->mg_obj);
1712 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1714 stash = GvSTASH((GV *)*svp++);
1715 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1722 (const GV *)mg->mg_obj
1725 /* The stash may have been detached from the symbol table, so check its
1726 name before doing anything. */
1727 if (stash && HvENAME_get(stash))
1728 mro_isa_changed_in(stash);
1734 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1736 HV * const hv = MUTABLE_HV(LvTARG(sv));
1739 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1740 PERL_UNUSED_ARG(mg);
1743 (void) hv_iterinit(hv);
1744 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1747 while (hv_iternext(hv))
1752 sv_setiv(sv, (IV)i);
1757 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1759 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1760 PERL_UNUSED_ARG(mg);
1762 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1768 =for apidoc magic_methcall
1770 Invoke a magic method (like FETCH).
1772 C<sv> and C<mg> are the tied thingy and the tie magic.
1774 C<meth> is the name of the method to call.
1776 C<argc> is the number of args (in addition to $self) to pass to the method.
1778 The C<flags> can be:
1780 G_DISCARD invoke method with G_DISCARD flag and don't
1782 G_UNDEF_FILL fill the stack with argc pointers to
1785 The arguments themselves are any values following the C<flags> argument.
1787 Returns the SV (if any) returned by the method, or NULL on failure.
1794 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1800 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1804 if (flags & G_WRITING_TO_STDERR) {
1807 SAVESPTR(PL_stderrgv);
1811 PUSHSTACKi(PERLSI_MAGIC);
1815 PUSHs(SvTIED_obj(sv, mg));
1816 if (flags & G_UNDEF_FILL) {
1818 PUSHs(&PL_sv_undef);
1820 } else if (argc > 0) {
1822 va_start(args, argc);
1825 SV *const sv = va_arg(args, SV *);
1832 if (flags & G_DISCARD) {
1833 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1836 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1837 ret = *PL_stack_sp--;
1840 if (flags & G_WRITING_TO_STDERR)
1846 /* wrapper for magic_methcall that creates the first arg */
1849 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1854 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1857 if (mg->mg_len >= 0) {
1858 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1860 else if (mg->mg_len == HEf_SVKEY)
1861 arg1 = MUTABLE_SV(mg->mg_ptr);
1863 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1864 arg1 = newSViv((IV)(mg->mg_len));
1868 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1870 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1874 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
1878 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1880 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1887 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1889 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1891 if (mg->mg_type == PERL_MAGIC_tiedelem)
1892 mg->mg_flags |= MGf_GSKIP;
1893 magic_methpack(sv,mg,SV_CONST(FETCH));
1898 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1903 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1905 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1906 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1907 * public flags indicate its value based on copying from $val. Doing
1908 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1909 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1910 * wrong if $val happened to be tainted, as sv hasn't got magic
1911 * enabled, even though taint magic is in the chain. In which case,
1912 * fake up a temporary tainted value (this is easier than temporarily
1913 * re-enabling magic on sv). */
1915 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
1916 && (tmg->mg_len & 1))
1918 val = sv_mortalcopy(sv);
1924 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
1929 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1931 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1933 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1934 return magic_methpack(sv,mg,SV_CONST(DELETE));
1939 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1944 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1946 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
1948 retval = SvIV(retsv)-1;
1950 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1952 return (U32) retval;
1956 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1958 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1960 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
1965 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1969 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1971 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1972 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
1979 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1981 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1983 return magic_methpack(sv,mg,SV_CONST(EXISTS));
1987 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1990 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1991 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1993 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1995 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1997 if (HvEITER_get(hv))
1998 /* we are in an iteration so the hash cannot be empty */
2000 /* no xhv_eiter so now use FIRSTKEY */
2001 key = sv_newmortal();
2002 magic_nextpack(MUTABLE_SV(hv), mg, key);
2003 HvEITER_set(hv, NULL); /* need to reset iterator */
2004 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2007 /* there is a SCALAR method that we can call */
2008 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2010 retval = &PL_sv_undef;
2015 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2019 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2021 /* The magic ptr/len for the debugger's hash should always be an SV. */
2022 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2023 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
2024 (IV)mg->mg_len, mg->mg_ptr);
2027 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2028 setting/clearing debugger breakpoints is not a hot path. */
2029 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2030 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2032 if (svp && SvIOKp(*svp)) {
2033 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2035 #ifdef PERL_DEBUG_READONLY_OPS
2036 Slab_to_rw(OpSLAB(o));
2038 /* set or clear breakpoint in the relevant control op */
2040 o->op_flags |= OPf_SPECIAL;
2042 o->op_flags &= ~OPf_SPECIAL;
2043 #ifdef PERL_DEBUG_READONLY_OPS
2044 Slab_to_ro(OpSLAB(o));
2052 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2054 AV * const obj = MUTABLE_AV(mg->mg_obj);
2056 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2059 sv_setiv(sv, AvFILL(obj));
2067 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2069 AV * const obj = MUTABLE_AV(mg->mg_obj);
2071 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2074 av_fill(obj, SvIV(sv));
2076 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2077 "Attempt to set length of freed array");
2083 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2085 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2086 PERL_UNUSED_ARG(sv);
2087 PERL_UNUSED_CONTEXT;
2089 /* Reset the iterator when the array is cleared */
2090 #if IVSIZE == I32SIZE
2091 *((IV *) &(mg->mg_len)) = 0;
2094 *((IV *) mg->mg_ptr) = 0;
2101 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2103 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2104 PERL_UNUSED_ARG(sv);
2106 /* during global destruction, mg_obj may already have been freed */
2107 if (PL_in_clean_all)
2110 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2113 /* arylen scalar holds a pointer back to the array, but doesn't own a
2114 reference. Hence the we (the array) are about to go away with it
2115 still pointing at us. Clear its pointer, else it would be pointing
2116 at free memory. See the comment in sv_magic about reference loops,
2117 and why it can't own a reference to us. */
2124 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2126 SV* const lsv = LvTARG(sv);
2127 MAGIC * const found = mg_find_mglob(lsv);
2129 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2130 PERL_UNUSED_ARG(mg);
2132 if (found && found->mg_len != -1) {
2133 STRLEN i = found->mg_len;
2134 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2135 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2144 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2146 SV* const lsv = LvTARG(sv);
2153 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2154 PERL_UNUSED_ARG(mg);
2156 found = mg_find_mglob(lsv);
2160 found = sv_magicext_mglob(lsv);
2162 else if (!SvOK(sv)) {
2166 s = SvPV_const(lsv, len);
2171 ulen = sv_or_pv_len_utf8(lsv, s, len);
2181 else if (pos > (SSize_t)len)
2184 found->mg_len = pos;
2185 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2191 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2194 SV * const lsv = LvTARG(sv);
2195 const char * const tmps = SvPV_const(lsv,len);
2196 STRLEN offs = LvTARGOFF(sv);
2197 STRLEN rem = LvTARGLEN(sv);
2198 const bool negoff = LvFLAGS(sv) & 1;
2199 const bool negrem = LvFLAGS(sv) & 2;
2201 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2202 PERL_UNUSED_ARG(mg);
2204 if (!translate_substr_offsets(
2205 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2206 negoff ? -(IV)offs : (IV)offs, !negoff,
2207 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2209 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2210 sv_setsv_nomg(sv, &PL_sv_undef);
2215 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2216 sv_setpvn(sv, tmps + offs, rem);
2223 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2225 STRLEN len, lsv_len, oldtarglen, newtarglen;
2226 const char * const tmps = SvPV_const(sv, len);
2227 SV * const lsv = LvTARG(sv);
2228 STRLEN lvoff = LvTARGOFF(sv);
2229 STRLEN lvlen = LvTARGLEN(sv);
2230 const bool negoff = LvFLAGS(sv) & 1;
2231 const bool neglen = LvFLAGS(sv) & 2;
2233 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2234 PERL_UNUSED_ARG(mg);
2238 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2239 "Attempt to use reference as lvalue in substr"
2241 SvPV_force_nomg(lsv,lsv_len);
2242 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2243 if (!translate_substr_offsets(
2245 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2246 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2248 Perl_croak(aTHX_ "substr outside of string");
2251 sv_utf8_upgrade_nomg(lsv);
2252 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2253 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2254 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2257 else if (SvUTF8(lsv)) {
2259 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2261 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2262 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2266 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2269 if (!neglen) LvTARGLEN(sv) = newtarglen;
2270 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2276 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2278 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2279 PERL_UNUSED_ARG(sv);
2280 #ifdef NO_TAINT_SUPPORT
2281 PERL_UNUSED_ARG(mg);
2284 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2289 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2291 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2292 PERL_UNUSED_ARG(sv);
2294 /* update taint status */
2303 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2305 SV * const lsv = LvTARG(sv);
2307 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2308 PERL_UNUSED_ARG(mg);
2310 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2316 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2318 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2319 PERL_UNUSED_ARG(mg);
2320 do_vecset(sv); /* XXX slurp this routine */
2325 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2328 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2329 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2331 if (LvTARGLEN(sv)) {
2333 SV * const ahv = LvTARG(sv);
2334 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2338 else if (LvSTARGOFF(sv) >= 0) {
2339 AV *const av = MUTABLE_AV(LvTARG(sv));
2340 if (LvSTARGOFF(sv) <= AvFILL(av))
2342 if (SvRMAGICAL(av)) {
2343 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2344 targ = svp ? *svp : NULL;
2347 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2350 if (targ && (targ != &PL_sv_undef)) {
2351 /* somebody else defined it for us */
2352 SvREFCNT_dec(LvTARG(sv));
2353 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2355 SvREFCNT_dec(mg->mg_obj);
2357 mg->mg_flags &= ~MGf_REFCOUNTED;
2366 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2368 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2370 sv_setsv(sv, defelem_target(sv, mg));
2375 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2377 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2378 PERL_UNUSED_ARG(mg);
2382 sv_setsv(LvTARG(sv), sv);
2383 SvSETMAGIC(LvTARG(sv));
2389 Perl_vivify_defelem(pTHX_ SV *sv)
2394 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2396 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2399 SV * const ahv = LvTARG(sv);
2400 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2403 if (!value || value == &PL_sv_undef)
2404 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2406 else if (LvSTARGOFF(sv) < 0)
2407 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2409 AV *const av = MUTABLE_AV(LvTARG(sv));
2410 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2411 LvTARG(sv) = NULL; /* array can't be extended */
2413 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2414 if (!svp || !(value = *svp))
2415 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2418 SvREFCNT_inc_simple_void(value);
2419 SvREFCNT_dec(LvTARG(sv));
2422 SvREFCNT_dec(mg->mg_obj);
2424 mg->mg_flags &= ~MGf_REFCOUNTED;
2428 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2430 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2431 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2436 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2438 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2439 PERL_UNUSED_CONTEXT;
2440 PERL_UNUSED_ARG(sv);
2446 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2448 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2450 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2452 if (uf && uf->uf_set)
2453 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2458 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2460 const char type = mg->mg_type;
2462 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2464 if (type == PERL_MAGIC_qr) {
2465 } else if (type == PERL_MAGIC_bm) {
2469 assert(type == PERL_MAGIC_fm);
2471 return sv_unmagic(sv, type);
2474 #ifdef USE_LOCALE_COLLATE
2476 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2478 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2481 * RenE<eacute> Descartes said "I think not."
2482 * and vanished with a faint plop.
2484 PERL_UNUSED_CONTEXT;
2485 PERL_UNUSED_ARG(sv);
2487 Safefree(mg->mg_ptr);
2493 #endif /* USE_LOCALE_COLLATE */
2495 /* Just clear the UTF-8 cache data. */
2497 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2499 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2500 PERL_UNUSED_CONTEXT;
2501 PERL_UNUSED_ARG(sv);
2502 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2504 mg->mg_len = -1; /* The mg_len holds the len cache. */
2509 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2511 const char *bad = NULL;
2512 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2513 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2514 switch (mg->mg_private & OPpLVREF_TYPE) {
2516 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2520 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2524 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2528 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2532 /* diag_listed_as: Assigned value is not %s reference */
2533 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2534 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2537 SV * const old = PAD_SV(mg->mg_len);
2538 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2543 gv_setref(mg->mg_obj, sv);
2544 SvSETMAGIC(mg->mg_obj);
2547 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2548 SvREFCNT_inc_simple_NN(SvRV(sv)));
2551 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2552 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2554 if (mg->mg_flags & MGf_PERSIST)
2555 NOOP; /* This sv is in use as an iterator var and will be reused,
2556 so we must leave the magic. */
2558 /* This sv could be returned by the assignment op, so clear the
2559 magic, as lvrefs are an implementation detail that must not be
2560 leaked to the user. */
2561 sv_unmagic(sv, PERL_MAGIC_lvref);
2566 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2578 PERL_ARGS_ASSERT_MAGIC_SET;
2582 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2584 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2586 /* Croak with a READONLY error when a numbered match var is
2587 * set without a previous pattern match. Unless it's C<local $1>
2590 if (!PL_localizing) {
2591 Perl_croak_no_modify();
2597 switch (*mg->mg_ptr) {
2598 case '\001': /* ^A */
2599 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2600 else SvOK_off(PL_bodytarget);
2601 FmLINES(PL_bodytarget) = 0;
2602 if (SvPOK(PL_bodytarget)) {
2603 char *s = SvPVX(PL_bodytarget);
2604 while ( ((s = strchr(s, '\n'))) ) {
2605 FmLINES(PL_bodytarget)++;
2609 /* mg_set() has temporarily made sv non-magical */
2611 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2612 SvTAINTED_on(PL_bodytarget);
2614 SvTAINTED_off(PL_bodytarget);
2617 case '\003': /* ^C */
2618 PL_minus_c = cBOOL(SvIV(sv));
2621 case '\004': /* ^D */
2623 s = SvPV_nolen_const(sv);
2624 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2625 if (DEBUG_x_TEST || DEBUG_B_TEST)
2626 dump_all_perl(!DEBUG_B_TEST);
2628 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2631 case '\005': /* ^E */
2632 if (*(mg->mg_ptr+1) == '\0') {
2634 set_vaxc_errno(SvIV(sv));
2637 SetLastError( SvIV(sv) );
2640 os2_setsyserrno(SvIV(sv));
2642 /* will anyone ever use this? */
2643 SETERRNO(SvIV(sv), 4);
2649 unsigned int offset = 1;
2652 /* It may be the shadow variable ${E_NCODING} which has lexical
2653 * scope. See comments at Perl__get_encoding in this file */
2654 if (*(mg->mg_ptr + 1) == '_') {
2655 if (CopSTASH(PL_curcop) != get_hv("encoding::",0))
2656 Perl_croak_no_modify();
2660 if (strEQ(mg->mg_ptr + offset, "NCODING")) {
2661 if (lex) { /* Use the shadow global */
2662 SvREFCNT_dec(PL_lex_encoding);
2663 if (SvOK(sv) || SvGMAGICAL(sv)) {
2664 PL_lex_encoding = newSVsv(sv);
2667 PL_lex_encoding = NULL;
2670 else { /* Use the regular global */
2671 SvREFCNT_dec(PL_encoding);
2672 if (SvOK(sv) || SvGMAGICAL(sv)) {
2673 if (PL_localizing != 2) {
2674 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2675 "Setting ${^ENCODING} is deprecated");
2677 PL_encoding = newSVsv(sv);
2686 case '\006': /* ^F */
2687 PL_maxsysfd = SvIV(sv);
2689 case '\010': /* ^H */
2690 PL_hints = SvIV(sv);
2692 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2693 Safefree(PL_inplace);
2694 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2696 case '\016': /* ^N */
2697 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2698 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2700 case '\017': /* ^O */
2701 if (*(mg->mg_ptr+1) == '\0') {
2702 Safefree(PL_osname);
2705 TAINT_PROPER("assigning to $^O");
2706 PL_osname = savesvpv(sv);
2709 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2711 const char *const start = SvPV(sv, len);
2712 const char *out = (const char*)memchr(start, '\0', len);
2716 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2717 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2719 /* Opening for input is more common than opening for output, so
2720 ensure that hints for input are sooner on linked list. */
2721 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2723 : newSVpvs_flags("", SvUTF8(sv));
2724 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2727 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2729 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2733 case '\020': /* ^P */
2734 PL_perldb = SvIV(sv);
2735 if (PL_perldb && !PL_DBsingle)
2738 case '\024': /* ^T */
2740 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2742 PL_basetime = (Time_t)SvIV(sv);
2745 case '\025': /* ^UTF8CACHE */
2746 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2747 PL_utf8cache = (signed char) sv_2iv(sv);
2750 case '\027': /* ^W & $^WARNING_BITS */
2751 if (*(mg->mg_ptr+1) == '\0') {
2752 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2754 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2755 | (i ? G_WARN_ON : G_WARN_OFF) ;
2758 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2759 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2761 PL_compiling.cop_warnings = pWARN_STD;
2766 int accumulate = 0 ;
2767 int any_fatals = 0 ;
2768 const char * const ptr = SvPV_const(sv, len) ;
2769 for (i = 0 ; i < len ; ++i) {
2770 accumulate |= ptr[i] ;
2771 any_fatals |= (ptr[i] & 0xAA) ;
2774 if (!specialWARN(PL_compiling.cop_warnings))
2775 PerlMemShared_free(PL_compiling.cop_warnings);
2776 PL_compiling.cop_warnings = pWARN_NONE;
2778 /* Yuck. I can't see how to abstract this: */
2780 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2784 if (!specialWARN(PL_compiling.cop_warnings))
2785 PerlMemShared_free(PL_compiling.cop_warnings);
2786 PL_compiling.cop_warnings = pWARN_ALL;
2787 PL_dowarn |= G_WARN_ONCE ;
2791 const char *const p = SvPV_const(sv, len);
2793 PL_compiling.cop_warnings
2794 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2797 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2798 PL_dowarn |= G_WARN_ONCE ;
2806 if (PL_localizing) {
2807 if (PL_localizing == 1)
2808 SAVESPTR(PL_last_in_gv);
2810 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2811 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2814 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2815 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2816 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2819 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2820 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2821 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2824 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2827 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2828 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2829 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2832 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2836 IO * const io = GvIO(PL_defoutgv);
2839 if ((SvIV(sv)) == 0)
2840 IoFLAGS(io) &= ~IOf_FLUSH;
2842 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2843 PerlIO *ofp = IoOFP(io);
2845 (void)PerlIO_flush(ofp);
2846 IoFLAGS(io) |= IOf_FLUSH;
2855 SV *referent= SvRV(sv);
2856 const char *reftype= sv_reftype(referent, 0);
2857 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2858 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2859 * a full string comparison on the return of sv_reftype() both of which
2860 * make me feel worse! NOTE, do not modify this comment without reviewing the
2861 * corresponding comment in sv_reftype(). - Yves */
2862 if (reftype[0] == 'S' || reftype[0] == 'L') {
2863 IV val= SvIV(referent);
2865 tmpsv= &PL_sv_undef;
2866 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2867 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2868 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2872 /* diag_listed_as: Setting $/ to %s reference is forbidden */
2873 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2874 *reftype == 'A' ? "n" : "", reftype);
2877 SvREFCNT_dec(PL_rs);
2878 PL_rs = newSVsv(tmpsv);
2882 SvREFCNT_dec(PL_ors_sv);
2884 PL_ors_sv = newSVsv(sv);
2892 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2895 #ifdef COMPLEX_STATUS
2896 if (PL_localizing == 2) {
2897 SvUPGRADE(sv, SVt_PVLV);
2898 PL_statusvalue = LvTARGOFF(sv);
2899 PL_statusvalue_vms = LvTARGLEN(sv);
2903 #ifdef VMSISH_STATUS
2905 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2908 STATUS_UNIX_EXIT_SET(SvIV(sv));
2913 # define PERL_VMS_BANG vaxc$errno
2915 # define PERL_VMS_BANG 0
2917 #if defined(WIN32) && ! defined(UNDER_CE)
2918 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2919 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2921 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2922 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2928 /* XXX $< currently silently ignores failures */
2929 const Uid_t new_uid = SvUID(sv);
2930 PL_delaymagic_uid = new_uid;
2931 if (PL_delaymagic) {
2932 PL_delaymagic |= DM_RUID;
2933 break; /* don't do magic till later */
2936 PERL_UNUSED_RESULT(setruid(new_uid));
2939 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2941 #ifdef HAS_SETRESUID
2942 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
2944 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2946 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2947 if (new_uid != 0 && PerlProc_getuid() == 0)
2948 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2950 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
2952 Perl_croak(aTHX_ "setruid() not implemented");
2961 /* XXX $> currently silently ignores failures */
2962 const Uid_t new_euid = SvUID(sv);
2963 PL_delaymagic_euid = new_euid;
2964 if (PL_delaymagic) {
2965 PL_delaymagic |= DM_EUID;
2966 break; /* don't do magic till later */
2969 PERL_UNUSED_RESULT(seteuid(new_euid));
2972 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2974 #ifdef HAS_SETRESUID
2975 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
2977 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
2978 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
2980 Perl_croak(aTHX_ "seteuid() not implemented");
2989 /* XXX $( currently silently ignores failures */
2990 const Gid_t new_gid = SvGID(sv);
2991 PL_delaymagic_gid = new_gid;
2992 if (PL_delaymagic) {
2993 PL_delaymagic |= DM_RGID;
2994 break; /* don't do magic till later */
2997 PERL_UNUSED_RESULT(setrgid(new_gid));
3000 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3002 #ifdef HAS_SETRESGID
3003 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3005 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3006 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3008 Perl_croak(aTHX_ "setrgid() not implemented");
3017 /* XXX $) currently silently ignores failures */
3019 #ifdef HAS_SETGROUPS
3021 const char *p = SvPV_const(sv, len);
3022 Groups_t *gary = NULL;
3024 #ifdef _SC_NGROUPS_MAX
3025 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3030 int maxgrp = NGROUPS;
3035 new_egid = (Gid_t)grok_atou(p, &endptr);
3036 for (i = 0; i < maxgrp; ++i) {
3045 Newx(gary, i + 1, Groups_t);
3047 Renew(gary, i + 1, Groups_t);
3048 gary[i] = (Groups_t)grok_atou(p, &endptr);
3051 PERL_UNUSED_RESULT(setgroups(i, gary));
3054 #else /* HAS_SETGROUPS */
3055 new_egid = SvGID(sv);
3056 #endif /* HAS_SETGROUPS */
3057 PL_delaymagic_egid = new_egid;
3058 if (PL_delaymagic) {
3059 PL_delaymagic |= DM_EGID;
3060 break; /* don't do magic till later */
3063 PERL_UNUSED_RESULT(setegid(new_egid));
3066 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3068 #ifdef HAS_SETRESGID
3069 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3071 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3072 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3074 Perl_croak(aTHX_ "setegid() not implemented");
3082 PL_chopset = SvPV_force(sv,len);
3085 /* Store the pid in mg->mg_obj so we can tell when a fork has
3086 occurred. mg->mg_obj points to *$ by default, so clear it. */
3087 if (isGV(mg->mg_obj)) {
3088 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3089 SvREFCNT_dec(mg->mg_obj);
3090 mg->mg_flags |= MGf_REFCOUNTED;
3091 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3093 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3096 LOCK_DOLLARZERO_MUTEX;
3097 #ifdef HAS_SETPROCTITLE
3098 /* The BSDs don't show the argv[] in ps(1) output, they
3099 * show a string from the process struct and provide
3100 * the setproctitle() routine to manipulate that. */
3101 if (PL_origalen != 1) {
3102 s = SvPV_const(sv, len);
3103 # if __FreeBSD_version > 410001
3104 /* The leading "-" removes the "perl: " prefix,
3105 * but not the "(perl) suffix from the ps(1)
3106 * output, because that's what ps(1) shows if the
3107 * argv[] is modified. */
3108 setproctitle("-%s", s);
3109 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
3110 /* This doesn't really work if you assume that
3111 * $0 = 'foobar'; will wipe out 'perl' from the $0
3112 * because in ps(1) output the result will be like
3113 * sprintf("perl: %s (perl)", s)
3114 * I guess this is a security feature:
3115 * one (a user process) cannot get rid of the original name.
3117 setproctitle("%s", s);
3120 #elif defined(__hpux) && defined(PSTAT_SETCMD)
3121 if (PL_origalen != 1) {
3123 s = SvPV_const(sv, len);
3124 un.pst_command = (char *)s;
3125 pstat(PSTAT_SETCMD, un, len, 0, 0);
3128 if (PL_origalen > 1) {
3129 /* PL_origalen is set in perl_parse(). */
3130 s = SvPV_force(sv,len);
3131 if (len >= (STRLEN)PL_origalen-1) {
3132 /* Longer than original, will be truncated. We assume that
3133 * PL_origalen bytes are available. */
3134 Copy(s, PL_origargv[0], PL_origalen-1, char);
3137 /* Shorter than original, will be padded. */
3139 /* Special case for Mac OS X: see [perl #38868] */
3142 /* Is the space counterintuitive? Yes.
3143 * (You were expecting \0?)
3144 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3146 const int pad = ' ';
3148 Copy(s, PL_origargv[0], len, char);
3149 PL_origargv[0][len] = 0;
3150 memset(PL_origargv[0] + len + 1,
3151 pad, PL_origalen - len - 1);
3153 PL_origargv[0][PL_origalen-1] = 0;
3154 for (i = 1; i < PL_origargc; i++)
3156 #ifdef HAS_PRCTL_SET_NAME
3157 /* Set the legacy process name in addition to the POSIX name on Linux */
3158 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3159 /* diag_listed_as: SKIPME */
3160 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3165 UNLOCK_DOLLARZERO_MUTEX;
3172 Perl_whichsig_sv(pTHX_ SV *sigsv)
3176 PERL_ARGS_ASSERT_WHICHSIG_SV;
3177 sigpv = SvPV_const(sigsv, siglen);
3178 return whichsig_pvn(sigpv, siglen);
3182 Perl_whichsig_pv(pTHX_ const char *sig)
3184 PERL_ARGS_ASSERT_WHICHSIG_PV;
3185 return whichsig_pvn(sig, strlen(sig));
3189 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3193 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3194 PERL_UNUSED_CONTEXT;
3196 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3197 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3198 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3200 if (memEQs(sig, len, "CHLD"))
3204 if (memEQs(sig, len, "CLD"))
3211 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3212 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3214 Perl_sighandler(int sig)
3217 #ifdef PERL_GET_SIG_CONTEXT
3218 dTHXa(PERL_GET_SIG_CONTEXT);
3225 SV * const tSv = PL_Sv;
3229 XPV * const tXpv = PL_Xpv;
3230 I32 old_ss_ix = PL_savestack_ix;
3231 SV *errsv_save = NULL;
3234 if (!PL_psig_ptr[sig]) {
3235 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3240 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3241 /* Max number of items pushed there is 3*n or 4. We cannot fix
3242 infinity, so we fix 4 (in fact 5): */
3243 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3245 PL_savestack_ix += 5; /* Protect save in progress. */
3246 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3249 /* sv_2cv is too complicated, try a simpler variant first: */
3250 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3251 || SvTYPE(cv) != SVt_PVCV) {
3253 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3256 if (!cv || !CvROOT(cv)) {
3257 const HEK * const hek = gv
3261 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3263 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3264 "SIG%s handler \"%"HEKf"\" not defined.\n",
3265 PL_sig_name[sig], hek);
3266 /* diag_listed_as: SIG%s handler "%s" not defined */
3267 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3268 "SIG%s handler \"__ANON__\" not defined.\n",
3273 sv = PL_psig_name[sig]
3274 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3275 : newSVpv(PL_sig_name[sig],0);
3279 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3280 /* make sure our assumption about the size of the SAVEs are correct:
3281 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3282 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3285 PUSHSTACKi(PERLSI_SIGNAL);
3288 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3290 struct sigaction oact;
3292 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3295 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3296 /* The siginfo fields signo, code, errno, pid, uid,
3297 * addr, status, and band are defined by POSIX/SUSv3. */
3298 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3299 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3300 #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. */
3301 hv_stores(sih, "errno", newSViv(sip->si_errno));
3302 hv_stores(sih, "status", newSViv(sip->si_status));
3303 hv_stores(sih, "uid", newSViv(sip->si_uid));
3304 hv_stores(sih, "pid", newSViv(sip->si_pid));
3305 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3306 hv_stores(sih, "band", newSViv(sip->si_band));
3310 mPUSHp((char *)sip, sizeof(*sip));
3318 errsv_save = newSVsv(ERRSV);
3320 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3324 SV * const errsv = ERRSV;
3325 if (SvTRUE_NN(errsv)) {
3326 SvREFCNT_dec(errsv_save);
3328 /* Handler "died", for example to get out of a restart-able read().
3329 * Before we re-do that on its behalf re-enable the signal which was
3330 * blocked by the system when we entered.
3332 #ifdef HAS_SIGPROCMASK
3333 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3339 sigaddset(&set,sig);
3340 sigprocmask(SIG_UNBLOCK, &set, NULL);
3343 /* Not clear if this will work */
3344 (void)rsignal(sig, SIG_IGN);
3345 (void)rsignal(sig, PL_csighandlerp);
3347 #endif /* !PERL_MICRO */
3351 sv_setsv(errsv, errsv_save);
3352 SvREFCNT_dec(errsv_save);
3357 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3358 PL_savestack_ix = old_ss_ix;
3360 SvREFCNT_dec_NN(sv);
3361 PL_op = myop; /* Apparently not needed... */
3363 PL_Sv = tSv; /* Restore global temporaries. */
3370 S_restore_magic(pTHX_ const void *p)
3372 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3373 SV* const sv = mgs->mgs_sv;
3379 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3380 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3381 #ifdef PERL_OLD_COPY_ON_WRITE
3382 /* While magic was saved (and off) sv_setsv may well have seen
3383 this SV as a prime candidate for COW. */
3385 sv_force_normal_flags(sv, 0);
3388 SvFLAGS(sv) |= mgs->mgs_flags;
3393 bumped = mgs->mgs_bumped;
3394 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3396 /* If we're still on top of the stack, pop us off. (That condition
3397 * will be satisfied if restore_magic was called explicitly, but *not*
3398 * if it's being called via leave_scope.)
3399 * The reason for doing this is that otherwise, things like sv_2cv()
3400 * may leave alloc gunk on the savestack, and some code
3401 * (e.g. sighandler) doesn't expect that...
3403 if (PL_savestack_ix == mgs->mgs_ss_ix)
3405 UV popval = SSPOPUV;
3406 assert(popval == SAVEt_DESTRUCTOR_X);
3407 PL_savestack_ix -= 2;
3409 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3410 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3413 if (SvREFCNT(sv) == 1) {
3414 /* We hold the last reference to this SV, which implies that the
3415 SV was deleted as a side effect of the routines we called.
3416 So artificially keep it alive a bit longer.
3417 We avoid turning on the TEMP flag, which can cause the SV's
3418 buffer to get stolen (and maybe other stuff). */
3423 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3427 /* clean up the mess created by Perl_sighandler().
3428 * Note that this is only called during an exit in a signal handler;
3429 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3433 S_unwind_handler_stack(pTHX_ const void *p)
3437 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3441 =for apidoc magic_sethint
3443 Triggered by a store to %^H, records the key/value pair to
3444 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3445 anything that would need a deep copy. Maybe we should warn if we find a
3451 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3453 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3454 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3456 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3458 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3459 an alternative leaf in there, with PL_compiling.cop_hints being used if
3460 it's NULL. If needed for threads, the alternative could lock a mutex,
3461 or take other more complex action. */
3463 /* Something changed in %^H, so it will need to be restored on scope exit.
3464 Doing this here saves a lot of doing it manually in perl code (and
3465 forgetting to do it, and consequent subtle errors. */
3466 PL_hints |= HINT_LOCALIZE_HH;
3467 CopHINTHASH_set(&PL_compiling,
3468 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3473 =for apidoc magic_clearhint
3475 Triggered by a delete from %^H, records the key to
3476 C<PL_compiling.cop_hints_hash>.
3481 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3483 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3484 PERL_UNUSED_ARG(sv);
3486 PL_hints |= HINT_LOCALIZE_HH;
3487 CopHINTHASH_set(&PL_compiling,
3488 mg->mg_len == HEf_SVKEY
3489 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3490 MUTABLE_SV(mg->mg_ptr), 0, 0)
3491 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3492 mg->mg_ptr, mg->mg_len, 0, 0));
3497 =for apidoc magic_clearhints
3499 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3504 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3506 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3507 PERL_UNUSED_ARG(sv);
3508 PERL_UNUSED_ARG(mg);
3509 cophh_free(CopHINTHASH_get(&PL_compiling));
3510 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3515 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3516 const char *name, I32 namlen)
3520 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3521 PERL_UNUSED_ARG(sv);
3522 PERL_UNUSED_ARG(name);
3523 PERL_UNUSED_ARG(namlen);
3525 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3526 nmg = mg_find(nsv, mg->mg_type);
3528 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3529 nmg->mg_ptr = mg->mg_ptr;
3530 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3531 nmg->mg_flags |= MGf_REFCOUNTED;
3536 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3537 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3539 #if DBVARMG_SINGLE != 0
3540 assert(mg->mg_private >= DBVARMG_SINGLE);
3542 assert(mg->mg_private < DBVARMG_COUNT);
3544 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3550 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3551 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3553 #if DBVARMG_SINGLE != 0
3554 assert(mg->mg_private >= DBVARMG_SINGLE);
3556 assert(mg->mg_private < DBVARMG_COUNT);
3557 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3564 * c-indentation-style: bsd
3566 * indent-tabs-mode: nil
3569 * ex: set ts=8 sts=4 sw=4 et: