3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
19 =head1 Magical Functions
20 "Magic" is special data attached to SV structures in order to give them
21 "magical" properties. When any Perl code tries to read from, or assign to,
22 an SV marked as magical, it calls the 'get' or 'set' function associated
23 with that SV's magic. A get is called prior to reading an SV, in order to
24 give it a chance to update its internal value (get on $. writes the line
25 number of the last read filehandle into the SV's IV slot), while
26 set is called after an SV has been written to, in order to allow it to make
27 use of its changed value (set on $/ copies the SV's new value to the
28 PL_rs global variable).
30 Magic is implemented as a linked list of MAGIC structures attached to the
31 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
32 of functions that implement the get(), set(), length() etc functions,
33 plus space for some flags and pointers. For example, a tied variable has
34 a MAGIC structure that contains a pointer to the object associated with the
45 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
51 #if defined(HAS_SETGROUPS)
58 # include <sys/pstat.h>
61 #ifdef HAS_PRCTL_SET_NAME
62 # include <sys/prctl.h>
65 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
66 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
68 Signal_t Perl_csighandler(int sig);
72 /* Missing protos on LynxOS */
73 void setruid(uid_t id);
74 void seteuid(uid_t id);
75 void setrgid(uid_t id);
76 void setegid(uid_t id);
80 * Pre-magic setup and post-magic takedown.
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
90 /* MGS is typedef'ed to struct magic_state in perl.h */
93 S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
100 assert(SvMAGICAL(sv));
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
115 mgs = SSPTR(mgs_ix, MGS*);
117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
119 mgs->mgs_bumped = bumped;
121 SvFLAGS(sv) &= ~flags;
125 #define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
128 =for apidoc mg_magical
130 Turns on the magical status of an SV. See C<L</sv_magic>>.
136 Perl_mg_magical(SV *sv)
139 PERL_ARGS_ASSERT_MG_MAGICAL;
142 if ((mg = SvMAGIC(sv))) {
144 const MGVTBL* const vtbl = mg->mg_virtual;
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
162 Do magic before a value is retrieved from the SV. The type of SV must
163 be >= C<SVt_PVMG>. See C<L</sv_magic>>.
169 Perl_mg_get(pTHX_ SV *sv)
171 const I32 mgs_ix = SSNEW(sizeof(MGS));
174 MAGIC *newmg, *head, *cur, *mg;
176 PERL_ARGS_ASSERT_MG_GET;
178 if (PL_localizing == 1 && sv == DEFSV) return 0;
180 /* We must call svt_get(sv, mg) for each valid entry in the linked
181 list of magic. svt_get() may delete the current entry, add new
182 magic to the head of the list, or upgrade the SV. AMS 20010810 */
184 newmg = cur = head = mg = SvMAGIC(sv);
186 const MGVTBL * const vtbl = mg->mg_virtual;
187 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
189 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
191 /* taint's mg get is so dumb it doesn't need flag saving */
192 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
193 save_magic(mgs_ix, sv);
197 vtbl->svt_get(aTHX_ sv, mg);
199 /* guard against magic having been deleted - eg FETCH calling
202 /* recalculate flags */
203 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
207 /* recalculate flags if this entry was deleted. */
208 if (mg->mg_flags & MGf_GSKIP)
209 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
210 ~(SVs_GMG|SVs_SMG|SVs_RMG);
212 else if (vtbl == &PL_vtbl_utf8) {
213 /* get-magic can reallocate the PV */
214 magic_setutf8(sv, mg);
220 /* Have we finished with the new entries we saw? Start again
221 where we left off (unless there are more new entries). */
229 /* Were any new entries added? */
230 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
234 /* recalculate flags */
235 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
240 restore_magic(INT2PTR(void *, (IV)mgs_ix));
248 Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
254 Perl_mg_set(pTHX_ SV *sv)
256 const I32 mgs_ix = SSNEW(sizeof(MGS));
260 PERL_ARGS_ASSERT_MG_SET;
262 if (PL_localizing == 2 && sv == DEFSV) return 0;
264 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
266 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
267 const MGVTBL* vtbl = mg->mg_virtual;
268 nextmg = mg->mg_moremagic; /* it may delete itself */
269 if (mg->mg_flags & MGf_GSKIP) {
270 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
271 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
273 if (PL_localizing == 2
274 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
276 if (vtbl && vtbl->svt_set)
277 vtbl->svt_set(aTHX_ sv, mg);
280 restore_magic(INT2PTR(void*, (IV)mgs_ix));
285 =for apidoc mg_length
287 Reports on the SV's length in bytes, calling length magic if available,
288 but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
289 magic if there is no 'length' magic, but with no indication as to
290 whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
291 higher. Use C<sv_len()> instead.
297 Perl_mg_length(pTHX_ SV *sv)
302 PERL_ARGS_ASSERT_MG_LENGTH;
304 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
305 const MGVTBL * const vtbl = mg->mg_virtual;
306 if (vtbl && vtbl->svt_len) {
307 const I32 mgs_ix = SSNEW(sizeof(MGS));
308 save_magic(mgs_ix, sv);
309 /* omit MGf_GSKIP -- not changed here */
310 len = vtbl->svt_len(aTHX_ sv, mg);
311 restore_magic(INT2PTR(void*, (IV)mgs_ix));
316 (void)SvPV_const(sv, len);
321 Perl_mg_size(pTHX_ SV *sv)
325 PERL_ARGS_ASSERT_MG_SIZE;
327 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
328 const MGVTBL* const vtbl = mg->mg_virtual;
329 if (vtbl && vtbl->svt_len) {
330 const I32 mgs_ix = SSNEW(sizeof(MGS));
332 save_magic(mgs_ix, sv);
333 /* omit MGf_GSKIP -- not changed here */
334 len = vtbl->svt_len(aTHX_ sv, mg);
335 restore_magic(INT2PTR(void*, (IV)mgs_ix));
342 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
346 Perl_croak(aTHX_ "Size magic not implemented");
349 NOT_REACHED; /* NOTREACHED */
355 Clear something magical that the SV represents. See C<L</sv_magic>>.
361 Perl_mg_clear(pTHX_ SV *sv)
363 const I32 mgs_ix = SSNEW(sizeof(MGS));
367 PERL_ARGS_ASSERT_MG_CLEAR;
369 save_magic(mgs_ix, sv);
371 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
372 const MGVTBL* const vtbl = mg->mg_virtual;
373 /* omit GSKIP -- never set here */
375 nextmg = mg->mg_moremagic; /* it may delete itself */
377 if (vtbl && vtbl->svt_clear)
378 vtbl->svt_clear(aTHX_ sv, mg);
381 restore_magic(INT2PTR(void*, (IV)mgs_ix));
386 S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
393 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
394 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
406 Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
412 Perl_mg_find(const SV *sv, int type)
414 return S_mg_findext_flags(sv, type, NULL, 0);
418 =for apidoc mg_findext
420 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
427 Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
429 return S_mg_findext_flags(sv, type, vtbl, 1);
433 Perl_mg_find_mglob(pTHX_ SV *sv)
435 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
436 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
437 /* This sv is only a delegate. //g magic must be attached to
442 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
443 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
450 Copies the magic from one SV to another. See C<L</sv_magic>>.
456 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
461 PERL_ARGS_ASSERT_MG_COPY;
463 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
464 const MGVTBL* const vtbl = mg->mg_virtual;
465 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
466 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
469 const char type = mg->mg_type;
470 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
472 (type == PERL_MAGIC_tied)
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 (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
490 gets copied, value magic doesn't (I<e.g.>,
493 If C<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. S<C<'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<L</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 C<how> from the SV C<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)))
775 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
778 const char *s = NULL;
780 const char * const remaining = mg->mg_ptr + 1;
783 PERL_ARGS_ASSERT_MAGIC_GET;
787 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
789 CALLREG_NUMBUF_FETCH(rx,paren,sv);
791 sv_setsv(sv,&PL_sv_undef);
796 nextchar = *remaining;
797 switch (*mg->mg_ptr) {
798 case '\001': /* ^A */
799 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
800 else sv_setsv(sv, &PL_sv_undef);
801 if (SvTAINTED(PL_bodytarget))
804 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
805 if (nextchar == '\0') {
806 sv_setiv(sv, (IV)PL_minus_c);
808 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
809 sv_setiv(sv, (IV)STATUS_NATIVE);
813 case '\004': /* ^D */
814 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
816 case '\005': /* ^E */
817 if (nextchar != '\0') {
818 if (strEQ(remaining, "NCODING"))
823 #if defined(VMS) || defined(OS2) || defined(WIN32)
827 $DESCRIPTOR(msgdsc,msg);
828 sv_setnv(sv,(NV) vaxc$errno);
829 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
830 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
835 if (!(_emx_env & 0x200)) { /* Under DOS */
836 sv_setnv(sv, (NV)errno);
837 sv_setpv(sv, errno ? my_strerror(errno) : "");
839 if (errno != errno_isOS2) {
840 const int tmp = _syserrno();
841 if (tmp) /* 2nd call to _syserrno() makes it 0 */
844 sv_setnv(sv, (NV)Perl_rc);
845 sv_setpv(sv, os2error(Perl_rc));
847 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
848 fixup_errno_string(sv);
850 # elif defined(WIN32)
852 const DWORD dwErr = GetLastError();
853 sv_setnv(sv, (NV)dwErr);
855 PerlProc_GetOSError(sv, dwErr);
856 fixup_errno_string(sv);
863 # error Missing code for platform
866 SvNOK_on(sv); /* what a wonderful hack! */
868 #endif /* End of platforms with special handling for $^E; others just fall
875 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
877 sv_setnv(sv, (NV)errno);
880 if (errno == errno_isOS2 || errno == errno_isOS2_set)
881 sv_setpv(sv, os2error(Perl_rc));
889 /* Strerror can return NULL on some platforms, which will
890 * result in 'sv' not being considered SvOK. The SvNOK_on()
891 * below will cause just the number part to be valid */
892 sv_setpv(sv, my_strerror(errno));
894 fixup_errno_string(sv);
901 SvNOK_on(sv); /* what a wonderful hack! */
904 case '\006': /* ^F */
905 sv_setiv(sv, (IV)PL_maxsysfd);
907 case '\007': /* ^GLOBAL_PHASE */
908 if (strEQ(remaining, "LOBAL_PHASE")) {
909 sv_setpvn(sv, PL_phase_names[PL_phase],
910 strlen(PL_phase_names[PL_phase]));
913 case '\010': /* ^H */
914 sv_setiv(sv, (IV)PL_hints);
916 case '\011': /* ^I */ /* NOT \t in EBCDIC */
917 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
919 case '\014': /* ^LAST_FH */
920 if (strEQ(remaining, "AST_FH")) {
922 assert(isGV_with_GP(PL_last_in_gv));
923 SV_CHECK_THINKFIRST_COW_DROP(sv);
924 prepare_SV_for_RV(sv);
926 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
930 else sv_setsv_nomg(sv, NULL);
933 case '\017': /* ^O & ^OPEN */
934 if (nextchar == '\0') {
935 sv_setpv(sv, PL_osname);
938 else if (strEQ(remaining, "PEN")) {
939 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
943 sv_setiv(sv, (IV)PL_perldb);
945 case '\023': /* ^S */
947 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
950 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
955 case '\024': /* ^T */
956 if (nextchar == '\0') {
958 sv_setnv(sv, PL_basetime);
960 sv_setiv(sv, (IV)PL_basetime);
963 else if (strEQ(remaining, "AINT"))
964 sv_setiv(sv, TAINTING_get
965 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
968 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
969 if (strEQ(remaining, "NICODE"))
970 sv_setuv(sv, (UV) PL_unicode);
971 else if (strEQ(remaining, "TF8LOCALE"))
972 sv_setuv(sv, (UV) PL_utf8locale);
973 else if (strEQ(remaining, "TF8CACHE"))
974 sv_setiv(sv, (IV) PL_utf8cache);
976 case '\027': /* ^W & $^WARNING_BITS */
977 if (nextchar == '\0')
978 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
979 else if (strEQ(remaining, "ARNING_BITS")) {
980 if (PL_compiling.cop_warnings == pWARN_NONE) {
981 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
983 else if (PL_compiling.cop_warnings == pWARN_STD) {
984 sv_setsv(sv, &PL_sv_undef);
987 else if (PL_compiling.cop_warnings == pWARN_ALL) {
988 /* Get the bit mask for $warnings::Bits{all}, because
989 * it could have been extended by warnings::register */
990 HV * const bits = get_hv("warnings::Bits", 0);
991 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
993 sv_copypv(sv, *bits_all);
995 sv_setpvn(sv, WARN_ALLstring, WARNsize);
998 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
999 *PL_compiling.cop_warnings);
1003 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1004 sv_setiv(sv, w32_sloppystat);
1009 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1010 paren = RX_LASTPAREN(rx);
1012 goto do_numbuf_fetch;
1014 sv_setsv(sv,&PL_sv_undef);
1016 case '\016': /* ^N */
1017 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1018 paren = RX_LASTCLOSEPAREN(rx);
1020 goto do_numbuf_fetch;
1022 sv_setsv(sv,&PL_sv_undef);
1025 if (GvIO(PL_last_in_gv)) {
1026 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1031 sv_setiv(sv, (IV)STATUS_CURRENT);
1032 #ifdef COMPLEX_STATUS
1033 SvUPGRADE(sv, SVt_PVLV);
1034 LvTARGOFF(sv) = PL_statusvalue;
1035 LvTARGLEN(sv) = PL_statusvalue_vms;
1040 if (GvIOp(PL_defoutgv))
1041 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1045 sv_setpv(sv,GvENAME(PL_defoutgv));
1046 sv_catpvs(sv,"_TOP");
1050 if (GvIOp(PL_defoutgv))
1051 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1053 s = GvENAME(PL_defoutgv);
1057 if (GvIO(PL_defoutgv))
1058 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1061 if (GvIO(PL_defoutgv))
1062 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1065 if (GvIO(PL_defoutgv))
1066 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1075 if (GvIO(PL_defoutgv))
1076 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1080 sv_copypv(sv, PL_ors_sv);
1082 sv_setsv(sv, &PL_sv_undef);
1086 IV const pid = (IV)PerlProc_getpid();
1087 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1088 /* never set manually, or at least not since last fork */
1090 /* never unsafe, even if reading in a tainted expression */
1093 /* else a value has been assigned manually, so do nothing */
1097 sv_setuid(sv, PerlProc_getuid());
1100 sv_setuid(sv, PerlProc_geteuid());
1103 sv_setgid(sv, PerlProc_getgid());
1106 sv_setgid(sv, PerlProc_getegid());
1108 #ifdef HAS_GETGROUPS
1110 Groups_t *gary = NULL;
1112 I32 num_groups = getgroups(0, gary);
1113 if (num_groups > 0) {
1114 Newx(gary, num_groups, Groups_t);
1115 num_groups = getgroups(num_groups, gary);
1116 for (i = 0; i < num_groups; i++)
1117 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1121 (void)SvIOK_on(sv); /* what a wonderful hack! */
1131 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1133 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1135 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1137 if (uf && uf->uf_val)
1138 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1143 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1145 STRLEN len = 0, klen;
1146 const char * const key = MgPV_const(mg,klen);
1149 PERL_ARGS_ASSERT_MAGIC_SETENV;
1153 /* defined environment variables are byte strings; unfortunately
1154 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1155 (void)SvPV_force_nomg_nolen(sv);
1156 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1158 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1164 my_setenv(key, s); /* does the deed */
1166 #ifdef DYNAMIC_ENV_FETCH
1167 /* We just undefd an environment var. Is a replacement */
1168 /* waiting in the wings? */
1170 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1172 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1176 #if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
1177 /* And you'll never guess what the dog had */
1178 /* in its mouth... */
1180 MgTAINTEDDIR_off(mg);
1182 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
1183 char pathbuf[256], eltbuf[256], *cp, *elt;
1186 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1188 do { /* DCL$PATH may be a search list */
1189 while (1) { /* as may dev portion of any element */
1190 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1191 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1192 cando_by_name(S_IWUSR,0,elt) ) {
1193 MgTAINTEDDIR_on(mg);
1197 if ((cp = strchr(elt, ':')) != NULL)
1199 if (my_trnlnm(elt, eltbuf, j++))
1205 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1208 if (s && klen == 4 && strEQ(key,"PATH")) {
1209 const char * const strend = s + len;
1211 while (s < strend) {
1215 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1216 const char path_sep = '|';
1218 const char path_sep = ':';
1220 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1221 s, strend, path_sep, &i);
1223 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1225 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1227 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1229 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1230 MgTAINTEDDIR_on(mg);
1236 #endif /* neither OS2 nor WIN32 nor MSDOS */
1242 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1244 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1245 PERL_UNUSED_ARG(sv);
1246 my_setenv(MgPV_nolen_const(mg),NULL);
1251 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1253 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1254 PERL_UNUSED_ARG(mg);
1256 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1258 if (PL_localizing) {
1261 hv_iterinit(MUTABLE_HV(sv));
1262 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1264 my_setenv(hv_iterkey(entry, &keylen),
1265 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1273 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1275 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1276 PERL_UNUSED_ARG(sv);
1277 PERL_UNUSED_ARG(mg);
1279 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1287 #ifdef HAS_SIGPROCMASK
1289 restore_sigmask(pTHX_ SV *save_sv)
1291 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1292 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1296 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1298 /* Are we fetching a signal entry? */
1299 int i = (I16)mg->mg_private;
1301 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1305 const char * sig = MgPV_const(mg, siglen);
1306 mg->mg_private = i = whichsig_pvn(sig, siglen);
1311 sv_setsv(sv,PL_psig_ptr[i]);
1313 Sighandler_t sigstate = rsignal_state(i);
1314 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1315 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1318 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1319 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1322 /* cache state so we don't fetch it again */
1323 if(sigstate == (Sighandler_t) SIG_IGN)
1324 sv_setpvs(sv,"IGNORE");
1326 sv_setsv(sv,&PL_sv_undef);
1327 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1334 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1336 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1338 magic_setsig(NULL, mg);
1339 return sv_unmagic(sv, mg->mg_type);
1343 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1344 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1346 Perl_csighandler(int sig)
1349 #ifdef PERL_GET_SIG_CONTEXT
1350 dTHXa(PERL_GET_SIG_CONTEXT);
1354 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1355 #if defined(__cplusplus) && defined(__GNUC__)
1356 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1357 * parameters would be warned about. */
1358 PERL_UNUSED_ARG(sip);
1359 PERL_UNUSED_ARG(uap);
1362 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1363 (void) rsignal(sig, PL_csighandlerp);
1364 if (PL_sig_ignoring[sig]) return;
1366 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1367 if (PL_sig_defaulting[sig])
1368 #ifdef KILL_BY_SIGPRC
1369 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1384 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1385 /* Call the perl level handler now--
1386 * with risk we may be in malloc() or being destructed etc. */
1387 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1388 (*PL_sighandlerp)(sig, NULL, NULL);
1390 (*PL_sighandlerp)(sig);
1393 if (!PL_psig_pend) return;
1394 /* Set a flag to say this signal is pending, that is awaiting delivery after
1395 * the current Perl opcode completes */
1396 PL_psig_pend[sig]++;
1398 #ifndef SIG_PENDING_DIE_COUNT
1399 # define SIG_PENDING_DIE_COUNT 120
1401 /* Add one to say _a_ signal is pending */
1402 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1403 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1404 (unsigned long)SIG_PENDING_DIE_COUNT);
1408 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1410 Perl_csighandler_init(void)
1413 if (PL_sig_handlers_initted) return;
1415 for (sig = 1; sig < SIG_SIZE; sig++) {
1416 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1418 PL_sig_defaulting[sig] = 1;
1419 (void) rsignal(sig, PL_csighandlerp);
1421 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1422 PL_sig_ignoring[sig] = 0;
1425 PL_sig_handlers_initted = 1;
1429 #if defined HAS_SIGPROCMASK
1431 unblock_sigmask(pTHX_ void* newset)
1433 PERL_UNUSED_CONTEXT;
1434 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1439 Perl_despatch_signals(pTHX)
1443 for (sig = 1; sig < SIG_SIZE; sig++) {
1444 if (PL_psig_pend[sig]) {
1446 #ifdef HAS_SIGPROCMASK
1447 /* From sigaction(2) (FreeBSD man page):
1448 * | Signal routines normally execute with the signal that
1449 * | caused their invocation blocked, but other signals may
1451 * Emulation of this behavior (from within Perl) is enabled
1455 sigset_t newset, oldset;
1457 sigemptyset(&newset);
1458 sigaddset(&newset, sig);
1459 sigprocmask(SIG_BLOCK, &newset, &oldset);
1460 was_blocked = sigismember(&oldset, sig);
1462 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1464 SAVEFREESV(save_sv);
1465 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1468 PL_psig_pend[sig] = 0;
1469 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1470 (*PL_sighandlerp)(sig, NULL, NULL);
1472 (*PL_sighandlerp)(sig);
1474 #ifdef HAS_SIGPROCMASK
1483 /* sv of NULL signifies that we're acting as magic_clearsig. */
1485 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1490 /* Need to be careful with SvREFCNT_dec(), because that can have side
1491 * effects (due to closures). We must make sure that the new disposition
1492 * is in place before it is called.
1496 #ifdef HAS_SIGPROCMASK
1500 const char *s = MgPV_const(mg,len);
1502 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1505 if (memEQs(s, len, "__DIE__"))
1507 else if (memEQs(s, len, "__WARN__")
1508 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1509 /* Merge the existing behaviours, which are as follows:
1510 magic_setsig, we always set svp to &PL_warnhook
1511 (hence we always change the warnings handler)
1512 For magic_clearsig, we don't change the warnings handler if it's
1513 set to the &PL_warnhook. */
1516 SV *tmp = sv_newmortal();
1517 Perl_croak(aTHX_ "No such hook: %s",
1518 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1522 if (*svp != PERL_WARNHOOK_FATAL)
1528 i = (I16)mg->mg_private;
1530 i = whichsig_pvn(s, len); /* ...no, a brick */
1531 mg->mg_private = (U16)i;
1535 SV *tmp = sv_newmortal();
1536 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1537 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1541 #ifdef HAS_SIGPROCMASK
1542 /* Avoid having the signal arrive at a bad time, if possible. */
1545 sigprocmask(SIG_BLOCK, &set, &save);
1547 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1548 SAVEFREESV(save_sv);
1549 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1552 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1553 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1555 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1556 PL_sig_ignoring[i] = 0;
1558 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1559 PL_sig_defaulting[i] = 0;
1561 to_dec = PL_psig_ptr[i];
1563 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1564 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1566 /* Signals don't change name during the program's execution, so once
1567 they're cached in the appropriate slot of PL_psig_name, they can
1570 Ideally we'd find some way of making SVs at (C) compile time, or
1571 at least, doing most of the work. */
1572 if (!PL_psig_name[i]) {
1573 PL_psig_name[i] = newSVpvn(s, len);
1574 SvREADONLY_on(PL_psig_name[i]);
1577 SvREFCNT_dec(PL_psig_name[i]);
1578 PL_psig_name[i] = NULL;
1579 PL_psig_ptr[i] = NULL;
1582 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1584 (void)rsignal(i, PL_csighandlerp);
1587 *svp = SvREFCNT_inc_simple_NN(sv);
1589 if (sv && SvOK(sv)) {
1590 s = SvPV_force(sv, len);
1594 if (sv && memEQs(s, len,"IGNORE")) {
1596 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1597 PL_sig_ignoring[i] = 1;
1598 (void)rsignal(i, PL_csighandlerp);
1600 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1604 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1606 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1607 PL_sig_defaulting[i] = 1;
1608 (void)rsignal(i, PL_csighandlerp);
1610 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1616 * We should warn if HINT_STRICT_REFS, but without
1617 * access to a known hint bit in a known OP, we can't
1618 * tell whether HINT_STRICT_REFS is in force or not.
1620 if (!strchr(s,':') && !strchr(s,'\''))
1621 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1624 (void)rsignal(i, PL_csighandlerp);
1626 *svp = SvREFCNT_inc_simple_NN(sv);
1630 #ifdef HAS_SIGPROCMASK
1634 SvREFCNT_dec(to_dec);
1637 #endif /* !PERL_MICRO */
1640 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1642 PERL_ARGS_ASSERT_MAGIC_SETISA;
1643 PERL_UNUSED_ARG(sv);
1645 /* Skip _isaelem because _isa will handle it shortly */
1646 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1649 return magic_clearisa(NULL, mg);
1652 /* sv of NULL signifies that we're acting as magic_setisa. */
1654 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1657 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1659 /* Bail out if destruction is going on */
1660 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1663 av_clear(MUTABLE_AV(sv));
1665 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1666 /* This occurs with setisa_elem magic, which calls this
1668 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1671 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1672 SV **svp = AvARRAY((AV *)mg->mg_obj);
1673 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1675 stash = GvSTASH((GV *)*svp++);
1676 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1683 (const GV *)mg->mg_obj
1686 /* The stash may have been detached from the symbol table, so check its
1687 name before doing anything. */
1688 if (stash && HvENAME_get(stash))
1689 mro_isa_changed_in(stash);
1695 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1697 HV * const hv = MUTABLE_HV(LvTARG(sv));
1700 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1701 PERL_UNUSED_ARG(mg);
1704 (void) hv_iterinit(hv);
1705 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1708 while (hv_iternext(hv))
1713 sv_setiv(sv, (IV)i);
1718 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1720 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1721 PERL_UNUSED_ARG(mg);
1723 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1729 =for apidoc magic_methcall
1731 Invoke a magic method (like FETCH).
1733 C<sv> and C<mg> are the tied thingy and the tie magic.
1735 C<meth> is the name of the method to call.
1737 C<argc> is the number of args (in addition to $self) to pass to the method.
1739 The C<flags> can be:
1741 G_DISCARD invoke method with G_DISCARD flag and don't
1743 G_UNDEF_FILL fill the stack with argc pointers to
1746 The arguments themselves are any values following the C<flags> argument.
1748 Returns the SV (if any) returned by the method, or C<NULL> on failure.
1755 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1761 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1765 if (flags & G_WRITING_TO_STDERR) {
1769 SAVESPTR(PL_stderrgv);
1773 PUSHSTACKi(PERLSI_MAGIC);
1776 /* EXTEND() expects a signed argc; don't wrap when casting */
1777 assert(argc <= I32_MAX);
1778 EXTEND(SP, (I32)argc+1);
1779 PUSHs(SvTIED_obj(sv, mg));
1780 if (flags & G_UNDEF_FILL) {
1782 PUSHs(&PL_sv_undef);
1784 } else if (argc > 0) {
1786 va_start(args, argc);
1789 SV *const sv = va_arg(args, SV *);
1796 if (flags & G_DISCARD) {
1797 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1800 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1801 ret = *PL_stack_sp--;
1804 if (flags & G_WRITING_TO_STDERR)
1810 /* wrapper for magic_methcall that creates the first arg */
1813 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1818 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1821 if (mg->mg_len >= 0) {
1822 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1824 else if (mg->mg_len == HEf_SVKEY)
1825 arg1 = MUTABLE_SV(mg->mg_ptr);
1827 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1828 arg1 = newSViv((IV)(mg->mg_len));
1832 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1834 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1838 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
1842 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1844 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1851 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1853 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1855 if (mg->mg_type == PERL_MAGIC_tiedelem)
1856 mg->mg_flags |= MGf_GSKIP;
1857 magic_methpack(sv,mg,SV_CONST(FETCH));
1862 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1867 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1869 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1870 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1871 * public flags indicate its value based on copying from $val. Doing
1872 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1873 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1874 * wrong if $val happened to be tainted, as sv hasn't got magic
1875 * enabled, even though taint magic is in the chain. In which case,
1876 * fake up a temporary tainted value (this is easier than temporarily
1877 * re-enabling magic on sv). */
1879 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
1880 && (tmg->mg_len & 1))
1882 val = sv_mortalcopy(sv);
1888 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
1893 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1895 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1897 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1898 return magic_methpack(sv,mg,SV_CONST(DELETE));
1903 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1908 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1910 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
1912 retval = SvIV(retsv)-1;
1914 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1916 return (U32) retval;
1920 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1922 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1924 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
1929 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1933 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1935 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1936 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
1943 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1945 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1947 return magic_methpack(sv,mg,SV_CONST(EXISTS));
1951 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1954 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1955 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1957 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1959 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1961 if (HvEITER_get(hv))
1962 /* we are in an iteration so the hash cannot be empty */
1964 /* no xhv_eiter so now use FIRSTKEY */
1965 key = sv_newmortal();
1966 magic_nextpack(MUTABLE_SV(hv), mg, key);
1967 HvEITER_set(hv, NULL); /* need to reset iterator */
1968 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1971 /* there is a SCALAR method that we can call */
1972 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
1974 retval = &PL_sv_undef;
1979 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1983 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1985 /* The magic ptr/len for the debugger's hash should always be an SV. */
1986 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
1987 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
1988 (IV)mg->mg_len, mg->mg_ptr);
1991 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
1992 setting/clearing debugger breakpoints is not a hot path. */
1993 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
1994 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
1996 if (svp && SvIOKp(*svp)) {
1997 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1999 #ifdef PERL_DEBUG_READONLY_OPS
2000 Slab_to_rw(OpSLAB(o));
2002 /* set or clear breakpoint in the relevant control op */
2004 o->op_flags |= OPf_SPECIAL;
2006 o->op_flags &= ~OPf_SPECIAL;
2007 #ifdef PERL_DEBUG_READONLY_OPS
2008 Slab_to_ro(OpSLAB(o));
2016 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2018 AV * const obj = MUTABLE_AV(mg->mg_obj);
2020 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2023 sv_setiv(sv, AvFILL(obj));
2031 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2033 AV * const obj = MUTABLE_AV(mg->mg_obj);
2035 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2038 av_fill(obj, SvIV(sv));
2040 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2041 "Attempt to set length of freed array");
2047 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2049 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2050 PERL_UNUSED_ARG(sv);
2051 PERL_UNUSED_CONTEXT;
2053 /* Reset the iterator when the array is cleared */
2054 #if IVSIZE == I32SIZE
2055 *((IV *) &(mg->mg_len)) = 0;
2058 *((IV *) mg->mg_ptr) = 0;
2065 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2067 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2068 PERL_UNUSED_ARG(sv);
2070 /* during global destruction, mg_obj may already have been freed */
2071 if (PL_in_clean_all)
2074 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2077 /* arylen scalar holds a pointer back to the array, but doesn't own a
2078 reference. Hence the we (the array) are about to go away with it
2079 still pointing at us. Clear its pointer, else it would be pointing
2080 at free memory. See the comment in sv_magic about reference loops,
2081 and why it can't own a reference to us. */
2088 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2090 SV* const lsv = LvTARG(sv);
2091 MAGIC * const found = mg_find_mglob(lsv);
2093 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2094 PERL_UNUSED_ARG(mg);
2096 if (found && found->mg_len != -1) {
2097 STRLEN i = found->mg_len;
2098 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2099 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2108 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2110 SV* const lsv = LvTARG(sv);
2117 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2118 PERL_UNUSED_ARG(mg);
2120 found = mg_find_mglob(lsv);
2124 found = sv_magicext_mglob(lsv);
2126 else if (!SvOK(sv)) {
2130 s = SvPV_const(lsv, len);
2135 ulen = sv_or_pv_len_utf8(lsv, s, len);
2145 else if (pos > (SSize_t)len)
2148 found->mg_len = pos;
2149 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2155 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2158 SV * const lsv = LvTARG(sv);
2159 const char * const tmps = SvPV_const(lsv,len);
2160 STRLEN offs = LvTARGOFF(sv);
2161 STRLEN rem = LvTARGLEN(sv);
2162 const bool negoff = LvFLAGS(sv) & 1;
2163 const bool negrem = LvFLAGS(sv) & 2;
2165 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2166 PERL_UNUSED_ARG(mg);
2168 if (!translate_substr_offsets(
2169 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2170 negoff ? -(IV)offs : (IV)offs, !negoff,
2171 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2173 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2174 sv_setsv_nomg(sv, &PL_sv_undef);
2179 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2180 sv_setpvn(sv, tmps + offs, rem);
2187 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2189 STRLEN len, lsv_len, oldtarglen, newtarglen;
2190 const char * const tmps = SvPV_const(sv, len);
2191 SV * const lsv = LvTARG(sv);
2192 STRLEN lvoff = LvTARGOFF(sv);
2193 STRLEN lvlen = LvTARGLEN(sv);
2194 const bool negoff = LvFLAGS(sv) & 1;
2195 const bool neglen = LvFLAGS(sv) & 2;
2197 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2198 PERL_UNUSED_ARG(mg);
2202 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2203 "Attempt to use reference as lvalue in substr"
2205 SvPV_force_nomg(lsv,lsv_len);
2206 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2207 if (!translate_substr_offsets(
2209 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2210 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2212 Perl_croak(aTHX_ "substr outside of string");
2215 sv_utf8_upgrade_nomg(lsv);
2216 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2217 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2218 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2221 else if (SvUTF8(lsv)) {
2223 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2225 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2226 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2230 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2233 if (!neglen) LvTARGLEN(sv) = newtarglen;
2234 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2240 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2242 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2243 PERL_UNUSED_ARG(sv);
2244 #ifdef NO_TAINT_SUPPORT
2245 PERL_UNUSED_ARG(mg);
2248 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2253 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2255 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2256 PERL_UNUSED_ARG(sv);
2258 /* update taint status */
2267 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2269 SV * const lsv = LvTARG(sv);
2271 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2272 PERL_UNUSED_ARG(mg);
2274 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2280 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2282 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2283 PERL_UNUSED_ARG(mg);
2284 do_vecset(sv); /* XXX slurp this routine */
2289 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2292 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2293 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2295 if (LvTARGLEN(sv)) {
2297 SV * const ahv = LvTARG(sv);
2298 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2302 else if (LvSTARGOFF(sv) >= 0) {
2303 AV *const av = MUTABLE_AV(LvTARG(sv));
2304 if (LvSTARGOFF(sv) <= AvFILL(av))
2306 if (SvRMAGICAL(av)) {
2307 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2308 targ = svp ? *svp : NULL;
2311 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2314 if (targ && (targ != &PL_sv_undef)) {
2315 /* somebody else defined it for us */
2316 SvREFCNT_dec(LvTARG(sv));
2317 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2319 SvREFCNT_dec(mg->mg_obj);
2321 mg->mg_flags &= ~MGf_REFCOUNTED;
2330 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2332 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2334 sv_setsv(sv, defelem_target(sv, mg));
2339 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2341 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2342 PERL_UNUSED_ARG(mg);
2346 sv_setsv(LvTARG(sv), sv);
2347 SvSETMAGIC(LvTARG(sv));
2353 Perl_vivify_defelem(pTHX_ SV *sv)
2358 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2360 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2363 SV * const ahv = LvTARG(sv);
2364 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2367 if (!value || value == &PL_sv_undef)
2368 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2370 else if (LvSTARGOFF(sv) < 0)
2371 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2373 AV *const av = MUTABLE_AV(LvTARG(sv));
2374 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2375 LvTARG(sv) = NULL; /* array can't be extended */
2377 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2378 if (!svp || !(value = *svp))
2379 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2382 SvREFCNT_inc_simple_void(value);
2383 SvREFCNT_dec(LvTARG(sv));
2386 SvREFCNT_dec(mg->mg_obj);
2388 mg->mg_flags &= ~MGf_REFCOUNTED;
2392 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2394 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2395 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2400 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2402 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2403 PERL_UNUSED_CONTEXT;
2404 PERL_UNUSED_ARG(sv);
2410 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2412 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2414 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2416 if (uf && uf->uf_set)
2417 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2422 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2424 const char type = mg->mg_type;
2426 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2428 if (type == PERL_MAGIC_qr) {
2429 } else if (type == PERL_MAGIC_bm) {
2433 assert(type == PERL_MAGIC_fm);
2435 return sv_unmagic(sv, type);
2438 #ifdef USE_LOCALE_COLLATE
2440 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2442 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2445 * RenE<eacute> Descartes said "I think not."
2446 * and vanished with a faint plop.
2448 PERL_UNUSED_CONTEXT;
2449 PERL_UNUSED_ARG(sv);
2451 Safefree(mg->mg_ptr);
2457 #endif /* USE_LOCALE_COLLATE */
2459 /* Just clear the UTF-8 cache data. */
2461 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2463 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2464 PERL_UNUSED_CONTEXT;
2465 PERL_UNUSED_ARG(sv);
2466 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2468 mg->mg_len = -1; /* The mg_len holds the len cache. */
2473 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2475 const char *bad = NULL;
2476 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2477 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2478 switch (mg->mg_private & OPpLVREF_TYPE) {
2480 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2484 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2488 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2492 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2496 /* diag_listed_as: Assigned value is not %s reference */
2497 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2498 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2501 SV * const old = PAD_SV(mg->mg_len);
2502 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2507 gv_setref(mg->mg_obj, sv);
2508 SvSETMAGIC(mg->mg_obj);
2511 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2512 SvREFCNT_inc_simple_NN(SvRV(sv)));
2515 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2516 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2518 if (mg->mg_flags & MGf_PERSIST)
2519 NOOP; /* This sv is in use as an iterator var and will be reused,
2520 so we must leave the magic. */
2522 /* This sv could be returned by the assignment op, so clear the
2523 magic, as lvrefs are an implementation detail that must not be
2524 leaked to the user. */
2525 sv_unmagic(sv, PERL_MAGIC_lvref);
2530 S_set_dollarzero(pTHX_ SV *sv)
2531 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2538 #ifdef HAS_SETPROCTITLE
2539 /* The BSDs don't show the argv[] in ps(1) output, they
2540 * show a string from the process struct and provide
2541 * the setproctitle() routine to manipulate that. */
2542 if (PL_origalen != 1) {
2543 s = SvPV_const(sv, len);
2544 # if __FreeBSD_version > 410001
2545 /* The leading "-" removes the "perl: " prefix,
2546 * but not the "(perl) suffix from the ps(1)
2547 * output, because that's what ps(1) shows if the
2548 * argv[] is modified. */
2549 setproctitle("-%s", s);
2550 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2551 /* This doesn't really work if you assume that
2552 * $0 = 'foobar'; will wipe out 'perl' from the $0
2553 * because in ps(1) output the result will be like
2554 * sprintf("perl: %s (perl)", s)
2555 * I guess this is a security feature:
2556 * one (a user process) cannot get rid of the original name.
2558 setproctitle("%s", s);
2561 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2562 if (PL_origalen != 1) {
2564 s = SvPV_const(sv, len);
2565 un.pst_command = (char *)s;
2566 pstat(PSTAT_SETCMD, un, len, 0, 0);
2569 if (PL_origalen > 1) {
2571 /* PL_origalen is set in perl_parse(). */
2572 s = SvPV_force(sv,len);
2573 if (len >= (STRLEN)PL_origalen-1) {
2574 /* Longer than original, will be truncated. We assume that
2575 * PL_origalen bytes are available. */
2576 Copy(s, PL_origargv[0], PL_origalen-1, char);
2579 /* Shorter than original, will be padded. */
2581 /* Special case for Mac OS X: see [perl #38868] */
2584 /* Is the space counterintuitive? Yes.
2585 * (You were expecting \0?)
2586 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2588 const int pad = ' ';
2590 Copy(s, PL_origargv[0], len, char);
2591 PL_origargv[0][len] = 0;
2592 memset(PL_origargv[0] + len + 1,
2593 pad, PL_origalen - len - 1);
2595 PL_origargv[0][PL_origalen-1] = 0;
2596 for (i = 1; i < PL_origargc; i++)
2598 #ifdef HAS_PRCTL_SET_NAME
2599 /* Set the legacy process name in addition to the POSIX name on Linux */
2600 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2601 /* diag_listed_as: SKIPME */
2602 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2610 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2621 PERL_ARGS_ASSERT_MAGIC_SET;
2625 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2627 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2629 /* Croak with a READONLY error when a numbered match var is
2630 * set without a previous pattern match. Unless it's C<local $1>
2633 if (!PL_localizing) {
2634 Perl_croak_no_modify();
2640 switch (*mg->mg_ptr) {
2641 case '\001': /* ^A */
2642 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2643 else SvOK_off(PL_bodytarget);
2644 FmLINES(PL_bodytarget) = 0;
2645 if (SvPOK(PL_bodytarget)) {
2646 char *s = SvPVX(PL_bodytarget);
2647 while ( ((s = strchr(s, '\n'))) ) {
2648 FmLINES(PL_bodytarget)++;
2652 /* mg_set() has temporarily made sv non-magical */
2654 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2655 SvTAINTED_on(PL_bodytarget);
2657 SvTAINTED_off(PL_bodytarget);
2660 case '\003': /* ^C */
2661 PL_minus_c = cBOOL(SvIV(sv));
2664 case '\004': /* ^D */
2667 const char *s = SvPV_nolen_const(sv);
2668 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2669 if (DEBUG_x_TEST || DEBUG_B_TEST)
2670 dump_all_perl(!DEBUG_B_TEST);
2673 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2676 case '\005': /* ^E */
2677 if (*(mg->mg_ptr+1) == '\0') {
2679 set_vaxc_errno(SvIV(sv));
2682 SetLastError( SvIV(sv) );
2685 os2_setsyserrno(SvIV(sv));
2687 /* will anyone ever use this? */
2688 SETERRNO(SvIV(sv), 4);
2694 if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2695 if (PL_localizing != 2) {
2696 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2697 "${^ENCODING} is no longer supported");
2701 case '\006': /* ^F */
2702 PL_maxsysfd = SvIV(sv);
2704 case '\010': /* ^H */
2705 PL_hints = SvIV(sv);
2707 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2708 Safefree(PL_inplace);
2709 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2711 case '\016': /* ^N */
2712 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2713 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2715 case '\017': /* ^O */
2716 if (*(mg->mg_ptr+1) == '\0') {
2717 Safefree(PL_osname);
2720 TAINT_PROPER("assigning to $^O");
2721 PL_osname = savesvpv(sv);
2724 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2726 const char *const start = SvPV(sv, len);
2727 const char *out = (const char*)memchr(start, '\0', len);
2731 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2732 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2734 /* Opening for input is more common than opening for output, so
2735 ensure that hints for input are sooner on linked list. */
2736 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2738 : newSVpvs_flags("", SvUTF8(sv));
2739 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2742 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2744 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2748 case '\020': /* ^P */
2749 PL_perldb = SvIV(sv);
2750 if (PL_perldb && !PL_DBsingle)
2753 case '\024': /* ^T */
2755 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2757 PL_basetime = (Time_t)SvIV(sv);
2760 case '\025': /* ^UTF8CACHE */
2761 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2762 PL_utf8cache = (signed char) sv_2iv(sv);
2765 case '\027': /* ^W & $^WARNING_BITS */
2766 if (*(mg->mg_ptr+1) == '\0') {
2767 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2769 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2770 | (i ? G_WARN_ON : G_WARN_OFF) ;
2773 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2774 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2776 PL_compiling.cop_warnings = pWARN_STD;
2781 int accumulate = 0 ;
2782 int any_fatals = 0 ;
2783 const char * const ptr = SvPV_const(sv, len) ;
2784 for (i = 0 ; i < len ; ++i) {
2785 accumulate |= ptr[i] ;
2786 any_fatals |= (ptr[i] & 0xAA) ;
2789 if (!specialWARN(PL_compiling.cop_warnings))
2790 PerlMemShared_free(PL_compiling.cop_warnings);
2791 PL_compiling.cop_warnings = pWARN_NONE;
2793 /* Yuck. I can't see how to abstract this: */
2795 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2799 if (!specialWARN(PL_compiling.cop_warnings))
2800 PerlMemShared_free(PL_compiling.cop_warnings);
2801 PL_compiling.cop_warnings = pWARN_ALL;
2802 PL_dowarn |= G_WARN_ONCE ;
2806 const char *const p = SvPV_const(sv, len);
2808 PL_compiling.cop_warnings
2809 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2812 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2813 PL_dowarn |= G_WARN_ONCE ;
2820 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2821 w32_sloppystat = (bool)sv_true(sv);
2826 if (PL_localizing) {
2827 if (PL_localizing == 1)
2828 SAVESPTR(PL_last_in_gv);
2830 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2831 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2834 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2835 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2836 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2839 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2840 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2841 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2844 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2847 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2848 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2849 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2852 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2856 IO * const io = GvIO(PL_defoutgv);
2859 if ((SvIV(sv)) == 0)
2860 IoFLAGS(io) &= ~IOf_FLUSH;
2862 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2863 PerlIO *ofp = IoOFP(io);
2865 (void)PerlIO_flush(ofp);
2866 IoFLAGS(io) |= IOf_FLUSH;
2875 SV *referent= SvRV(sv);
2876 const char *reftype= sv_reftype(referent, 0);
2877 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2878 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2879 * a full string comparison on the return of sv_reftype() both of which
2880 * make me feel worse! NOTE, do not modify this comment without reviewing the
2881 * corresponding comment in sv_reftype(). - Yves */
2882 if (reftype[0] == 'S' || reftype[0] == 'L') {
2883 IV val= SvIV(referent);
2885 tmpsv= &PL_sv_undef;
2886 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2887 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2888 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2892 sv_setsv(sv, PL_rs);
2893 /* diag_listed_as: Setting $/ to %s reference is forbidden */
2894 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2895 *reftype == 'A' ? "n" : "", reftype);
2898 SvREFCNT_dec(PL_rs);
2899 PL_rs = newSVsv(tmpsv);
2903 SvREFCNT_dec(PL_ors_sv);
2905 PL_ors_sv = newSVsv(sv);
2913 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2916 #ifdef COMPLEX_STATUS
2917 if (PL_localizing == 2) {
2918 SvUPGRADE(sv, SVt_PVLV);
2919 PL_statusvalue = LvTARGOFF(sv);
2920 PL_statusvalue_vms = LvTARGLEN(sv);
2924 #ifdef VMSISH_STATUS
2926 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2929 STATUS_UNIX_EXIT_SET(SvIV(sv));
2934 # define PERL_VMS_BANG vaxc$errno
2936 # define PERL_VMS_BANG 0
2938 #if defined(WIN32) && ! defined(UNDER_CE)
2939 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2940 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2942 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2943 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2949 /* XXX $< currently silently ignores failures */
2950 const Uid_t new_uid = SvUID(sv);
2951 PL_delaymagic_uid = new_uid;
2952 if (PL_delaymagic) {
2953 PL_delaymagic |= DM_RUID;
2954 break; /* don't do magic till later */
2957 PERL_UNUSED_RESULT(setruid(new_uid));
2960 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2962 #ifdef HAS_SETRESUID
2963 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
2965 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2967 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2968 if (new_uid != 0 && PerlProc_getuid() == 0)
2969 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2971 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
2973 Perl_croak(aTHX_ "setruid() not implemented");
2982 /* XXX $> currently silently ignores failures */
2983 const Uid_t new_euid = SvUID(sv);
2984 PL_delaymagic_euid = new_euid;
2985 if (PL_delaymagic) {
2986 PL_delaymagic |= DM_EUID;
2987 break; /* don't do magic till later */
2990 PERL_UNUSED_RESULT(seteuid(new_euid));
2993 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2995 #ifdef HAS_SETRESUID
2996 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
2998 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
2999 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
3001 Perl_croak(aTHX_ "seteuid() not implemented");
3010 /* XXX $( currently silently ignores failures */
3011 const Gid_t new_gid = SvGID(sv);
3012 PL_delaymagic_gid = new_gid;
3013 if (PL_delaymagic) {
3014 PL_delaymagic |= DM_RGID;
3015 break; /* don't do magic till later */
3018 PERL_UNUSED_RESULT(setrgid(new_gid));
3021 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3023 #ifdef HAS_SETRESGID
3024 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3026 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3027 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3029 Perl_croak(aTHX_ "setrgid() not implemented");
3038 /* (hv) best guess: maybe we'll need configure probes to do a better job,
3039 * but you can override it if you need to.
3042 #define INVALID_GID ((Gid_t)-1)
3044 /* XXX $) currently silently ignores failures */
3046 #ifdef HAS_SETGROUPS
3048 const char *p = SvPV_const(sv, len);
3049 Groups_t *gary = NULL;
3052 #ifdef _SC_NGROUPS_MAX
3053 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3058 int maxgrp = NGROUPS;
3063 if (grok_atoUV(p, &uv, &endptr))
3064 new_egid = (Gid_t)uv;
3066 new_egid = INVALID_GID;
3069 for (i = 0; i < maxgrp; ++i) {
3078 Newx(gary, i + 1, Groups_t);
3080 Renew(gary, i + 1, Groups_t);
3081 if (grok_atoUV(p, &uv, &endptr))
3082 gary[i] = (Groups_t)uv;
3084 gary[i] = INVALID_GID;
3089 PERL_UNUSED_RESULT(setgroups(i, gary));
3092 #else /* HAS_SETGROUPS */
3093 new_egid = SvGID(sv);
3094 #endif /* HAS_SETGROUPS */
3095 PL_delaymagic_egid = new_egid;
3096 if (PL_delaymagic) {
3097 PL_delaymagic |= DM_EGID;
3098 break; /* don't do magic till later */
3101 PERL_UNUSED_RESULT(setegid(new_egid));
3104 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3106 #ifdef HAS_SETRESGID
3107 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3109 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3110 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3112 Perl_croak(aTHX_ "setegid() not implemented");
3120 PL_chopset = SvPV_force(sv,len);
3123 /* Store the pid in mg->mg_obj so we can tell when a fork has
3124 occurred. mg->mg_obj points to *$ by default, so clear it. */
3125 if (isGV(mg->mg_obj)) {
3126 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3127 SvREFCNT_dec(mg->mg_obj);
3128 mg->mg_flags |= MGf_REFCOUNTED;
3129 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3131 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3134 LOCK_DOLLARZERO_MUTEX;
3135 S_set_dollarzero(aTHX_ sv);
3136 UNLOCK_DOLLARZERO_MUTEX;
3143 Perl_whichsig_sv(pTHX_ SV *sigsv)
3147 PERL_ARGS_ASSERT_WHICHSIG_SV;
3148 sigpv = SvPV_const(sigsv, siglen);
3149 return whichsig_pvn(sigpv, siglen);
3153 Perl_whichsig_pv(pTHX_ const char *sig)
3155 PERL_ARGS_ASSERT_WHICHSIG_PV;
3156 return whichsig_pvn(sig, strlen(sig));
3160 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3164 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3165 PERL_UNUSED_CONTEXT;
3167 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3168 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3169 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3171 if (memEQs(sig, len, "CHLD"))
3175 if (memEQs(sig, len, "CLD"))
3182 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3183 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3185 Perl_sighandler(int sig)
3188 #ifdef PERL_GET_SIG_CONTEXT
3189 dTHXa(PERL_GET_SIG_CONTEXT);
3196 SV * const tSv = PL_Sv;
3200 XPV * const tXpv = PL_Xpv;
3201 I32 old_ss_ix = PL_savestack_ix;
3202 SV *errsv_save = NULL;
3205 if (!PL_psig_ptr[sig]) {
3206 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3211 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3212 /* Max number of items pushed there is 3*n or 4. We cannot fix
3213 infinity, so we fix 4 (in fact 5): */
3214 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3216 PL_savestack_ix += 5; /* Protect save in progress. */
3217 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3220 /* sv_2cv is too complicated, try a simpler variant first: */
3221 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3222 || SvTYPE(cv) != SVt_PVCV) {
3224 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3227 if (!cv || !CvROOT(cv)) {
3228 const HEK * const hek = gv
3232 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3234 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3235 "SIG%s handler \"%"HEKf"\" not defined.\n",
3236 PL_sig_name[sig], HEKfARG(hek));
3237 /* diag_listed_as: SIG%s handler "%s" not defined */
3238 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3239 "SIG%s handler \"__ANON__\" not defined.\n",
3244 sv = PL_psig_name[sig]
3245 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3246 : newSVpv(PL_sig_name[sig],0);
3250 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3251 /* make sure our assumption about the size of the SAVEs are correct:
3252 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3253 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3256 PUSHSTACKi(PERLSI_SIGNAL);
3259 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3261 struct sigaction oact;
3263 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3266 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3267 /* The siginfo fields signo, code, errno, pid, uid,
3268 * addr, status, and band are defined by POSIX/SUSv3. */
3269 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3270 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3271 #ifdef HAS_SIGINFO_SI_ERRNO
3272 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3274 #ifdef HAS_SIGINFO_SI_STATUS
3275 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3277 #ifdef HAS_SIGINFO_SI_UID
3280 sv_setuid(uid, sip->si_uid);
3281 (void)hv_stores(sih, "uid", uid);
3284 #ifdef HAS_SIGINFO_SI_PID
3285 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3287 #ifdef HAS_SIGINFO_SI_ADDR
3288 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3290 #ifdef HAS_SIGINFO_SI_BAND
3291 (void)hv_stores(sih, "band", newSViv(sip->si_band));
3295 mPUSHp((char *)sip, sizeof(*sip));
3303 errsv_save = newSVsv(ERRSV);
3305 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3309 SV * const errsv = ERRSV;
3310 if (SvTRUE_NN(errsv)) {
3311 SvREFCNT_dec(errsv_save);
3313 /* Handler "died", for example to get out of a restart-able read().
3314 * Before we re-do that on its behalf re-enable the signal which was
3315 * blocked by the system when we entered.
3317 #ifdef HAS_SIGPROCMASK
3318 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3324 sigaddset(&set,sig);
3325 sigprocmask(SIG_UNBLOCK, &set, NULL);
3328 /* Not clear if this will work */
3329 (void)rsignal(sig, SIG_IGN);
3330 (void)rsignal(sig, PL_csighandlerp);
3332 #endif /* !PERL_MICRO */
3336 sv_setsv(errsv, errsv_save);
3337 SvREFCNT_dec(errsv_save);
3342 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3343 PL_savestack_ix = old_ss_ix;
3345 SvREFCNT_dec_NN(sv);
3346 PL_op = myop; /* Apparently not needed... */
3348 PL_Sv = tSv; /* Restore global temporaries. */
3355 S_restore_magic(pTHX_ const void *p)
3357 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3358 SV* const sv = mgs->mgs_sv;
3364 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3365 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3367 SvFLAGS(sv) |= mgs->mgs_flags;
3372 bumped = mgs->mgs_bumped;
3373 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3375 /* If we're still on top of the stack, pop us off. (That condition
3376 * will be satisfied if restore_magic was called explicitly, but *not*
3377 * if it's being called via leave_scope.)
3378 * The reason for doing this is that otherwise, things like sv_2cv()
3379 * may leave alloc gunk on the savestack, and some code
3380 * (e.g. sighandler) doesn't expect that...
3382 if (PL_savestack_ix == mgs->mgs_ss_ix)
3384 UV popval = SSPOPUV;
3385 assert(popval == SAVEt_DESTRUCTOR_X);
3386 PL_savestack_ix -= 2;
3388 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3389 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3392 if (SvREFCNT(sv) == 1) {
3393 /* We hold the last reference to this SV, which implies that the
3394 SV was deleted as a side effect of the routines we called.
3395 So artificially keep it alive a bit longer.
3396 We avoid turning on the TEMP flag, which can cause the SV's
3397 buffer to get stolen (and maybe other stuff). */
3402 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3406 /* clean up the mess created by Perl_sighandler().
3407 * Note that this is only called during an exit in a signal handler;
3408 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3412 S_unwind_handler_stack(pTHX_ const void *p)
3416 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3420 =for apidoc magic_sethint
3422 Triggered by a store to C<%^H>, records the key/value pair to
3423 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3424 anything that would need a deep copy. Maybe we should warn if we find a
3430 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3432 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3433 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3435 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3437 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3438 an alternative leaf in there, with PL_compiling.cop_hints being used if
3439 it's NULL. If needed for threads, the alternative could lock a mutex,
3440 or take other more complex action. */
3442 /* Something changed in %^H, so it will need to be restored on scope exit.
3443 Doing this here saves a lot of doing it manually in perl code (and
3444 forgetting to do it, and consequent subtle errors. */
3445 PL_hints |= HINT_LOCALIZE_HH;
3446 CopHINTHASH_set(&PL_compiling,
3447 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3452 =for apidoc magic_clearhint
3454 Triggered by a delete from C<%^H>, records the key to
3455 C<PL_compiling.cop_hints_hash>.
3460 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3462 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3463 PERL_UNUSED_ARG(sv);
3465 PL_hints |= HINT_LOCALIZE_HH;
3466 CopHINTHASH_set(&PL_compiling,
3467 mg->mg_len == HEf_SVKEY
3468 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3469 MUTABLE_SV(mg->mg_ptr), 0, 0)
3470 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3471 mg->mg_ptr, mg->mg_len, 0, 0));
3476 =for apidoc magic_clearhints
3478 Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
3483 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3485 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3486 PERL_UNUSED_ARG(sv);
3487 PERL_UNUSED_ARG(mg);
3488 cophh_free(CopHINTHASH_get(&PL_compiling));
3489 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3494 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3495 const char *name, I32 namlen)
3499 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3500 PERL_UNUSED_ARG(sv);
3501 PERL_UNUSED_ARG(name);
3502 PERL_UNUSED_ARG(namlen);
3504 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3505 nmg = mg_find(nsv, mg->mg_type);
3507 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3508 nmg->mg_ptr = mg->mg_ptr;
3509 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3510 nmg->mg_flags |= MGf_REFCOUNTED;
3515 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3516 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3518 #if DBVARMG_SINGLE != 0
3519 assert(mg->mg_private >= DBVARMG_SINGLE);
3521 assert(mg->mg_private < DBVARMG_COUNT);
3523 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3529 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3530 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3532 #if DBVARMG_SINGLE != 0
3533 assert(mg->mg_private >= DBVARMG_SINGLE);
3535 assert(mg->mg_private < DBVARMG_COUNT);
3536 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3542 * ex: set ts=8 sts=4 sw=4 et: