1 /* This file is part of the Variable::Magic Perl module.
2 * See http://search.cpan.org/dist/Variable-Magic/ */
4 #include <stdarg.h> /* <va_list>, va_{start,arg,end}, ... */
6 #include <stdio.h> /* sprintf() */
8 #define PERL_NO_GET_CONTEXT
13 #define __PACKAGE__ "Variable::Magic"
15 #ifndef VMG_PERL_PATCHLEVEL
17 # define VMG_PERL_PATCHLEVEL PERL_PATCHNUM
19 # define VMG_PERL_PATCHLEVEL 0
23 #define VMG_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
25 #define VMG_HAS_PERL_BRANCH(R, V, S) (PERL_REVISION == (R) && PERL_VERSION == (V) && PERL_SUBVERSION >= (S))
27 #define VMG_HAS_PERL_MAINT(R, V, S, P) (PERL_REVISION == (R) && PERL_VERSION == (V) && (VMG_PERL_PATCHLEVEL >= (P) || (!VMG_PERL_PATCHLEVEL && PERL_SUBVERSION >= (S))))
29 /* --- Threads and multiplicity -------------------------------------------- */
39 /* Safe unless stated otherwise in Makefile.PL */
41 # define VMG_FORKSAFE 1
44 #ifndef VMG_MULTIPLICITY
45 # if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
46 # define VMG_MULTIPLICITY 1
48 # define VMG_MULTIPLICITY 0
51 #if VMG_MULTIPLICITY && !defined(tTHX)
52 # define tTHX PerlInterpreter*
55 #if VMG_MULTIPLICITY && defined(USE_ITHREADS) && defined(dMY_CXT) && defined(MY_CXT) && defined(START_MY_CXT) && defined(MY_CXT_INIT) && (defined(MY_CXT_CLONE) || defined(dMY_CXT_SV))
56 # define VMG_THREADSAFE 1
58 # define MY_CXT_CLONE \
60 my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
61 Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
62 sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
65 # define VMG_THREADSAFE 0
67 # define dMY_CXT dNOOP
69 # define MY_CXT vmg_globaldata
71 # define START_MY_CXT STATIC my_cxt_t MY_CXT;
73 # define MY_CXT_INIT NOOP
75 # define MY_CXT_CLONE NOOP
80 STATIC SV *vmg_clone(pTHX_ SV *sv, tTHX owner) {
81 #define vmg_clone(P, O) vmg_clone(aTHX_ (P), (O))
83 param.stashes = NULL; /* don't need it unless sv is a PVHV */
85 param.proto_perl = owner;
86 return sv_dup(sv, ¶m);
89 #endif /* VMG_THREADSAFE */
91 /* --- Compatibility ------------------------------------------------------- */
94 # define Newx(v, n, c) New(0, v, n, c)
98 # define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
102 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
106 # define SvPV_const SvPV
109 #ifndef PERL_MAGIC_ext
110 # define PERL_MAGIC_ext '~'
113 #ifndef PERL_MAGIC_tied
114 # define PERL_MAGIC_tied 'P'
129 #ifndef IN_PERL_COMPILETIME
130 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
133 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
134 # ifndef PL_error_count
135 # define PL_error_count PL_parser->error_count
138 # ifndef PL_error_count
139 # define PL_error_count PL_Ierror_count
143 /* uvar magic and Hash::Util::FieldHash were commited with 28419, but only
144 * enable it on 5.10 */
145 #if VMG_HAS_PERL(5, 10, 0)
151 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160, partially
152 * reverted to dev-5.11 as 9cdcb38b */
153 #if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
154 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
155 /* This branch should only apply for perls before the official 5.11.0 release.
156 * Makefile.PL takes care of the higher ones. */
157 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
159 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
160 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 1
163 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
164 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
166 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
167 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 0
171 /* Applied to dev-5.11 as 34908 */
172 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908)
173 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
175 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
178 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
179 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
180 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
182 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
185 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969)
186 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
188 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
193 /* Bug-free mg_magical - see http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html - but specialized to our needs. */
194 STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
195 #define vmg_sv_magicuvar(S, U, L) vmg_sv_magicuvar(aTHX_ (S), (U), (L))
197 sv_magic(sv, NULL, PERL_MAGIC_uvar, uf, len);
198 /* uvar magic has set and get magic, hence this has set SVs_GMG and SVs_SMG. */
199 if ((mg = SvMAGIC(sv))) {
202 const MGVTBL* const vtbl = mg->mg_virtual;
204 if (vtbl->svt_clear) {
209 } while ((mg = mg->mg_moremagic));
213 #endif /* VMG_UVAR */
215 /* --- Stolen chunk of B --------------------------------------------------- */
233 STATIC const char *const vmg_opclassnames[] = {
248 STATIC opclass vmg_opclass(const OP *o) {
255 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
257 if (o->op_type == OP_SASSIGN)
258 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
260 if (o->op_type == OP_AELEMFAST) {
261 if (o->op_flags & OPf_SPECIAL)
272 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
276 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
293 case OA_PVOP_OR_SVOP:
294 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
299 case OA_BASEOP_OR_UNOP:
300 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
302 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
304 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
306 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
309 if (o->op_flags & OPf_STACKED)
311 else if (o->op_flags & OPf_SPECIAL)
320 /* --- Context-safe global data -------------------------------------------- */
322 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
326 HV *b__op_stashes[OPc_MAX];
331 /* --- Error messages ------------------------------------------------------ */
333 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
334 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
335 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
336 STATIC const char vmg_toomanysigs[] = "Too many magic signatures used";
337 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
338 STATIC const char vmg_globstorefail[] = "Couldn't store global wizard information";
340 /* --- Signatures ---------------------------------------------------------- */
342 #define SIG_MIN ((U16) 0u)
343 #define SIG_MAX ((U16) ((1u << 16) - 1))
344 #define SIG_NBR (SIG_MAX - SIG_MIN + 1)
346 #define SIG_WZO ((U16) (0x3891))
347 #define SIG_WIZ ((U16) (0x3892))
349 /* ... Generate signatures ................................................. */
351 STATIC U16 vmg_gensig(pTHX) {
352 #define vmg_gensig() vmg_gensig(aTHX)
357 if (HvKEYS(MY_CXT.wizards) >= SIG_NBR) croak(vmg_toomanysigs);
360 sig = SIG_NBR * Drand01() + SIG_MIN;
361 } while (hv_exists(MY_CXT.wizards, buf, sprintf(buf, "%u", sig)));
366 /* --- MGWIZ structure ----------------------------------------------------- */
376 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
379 #endif /* MGf_COPY */
385 #endif /* MGf_LOCAL */
387 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
388 #endif /* VMG_UVAR */
391 #endif /* VMG_MULTIPLICITY */
394 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
395 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
397 /* ... Construct private data .............................................. */
399 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
400 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
402 I32 i, alen = (args == NULL) ? 0 : av_len(args);
410 EXTEND(SP, alen + 1);
411 PUSHs(sv_2mortal(newRV_inc(sv)));
412 for (i = 0; i < alen; ++i)
413 PUSHs(*av_fetch(args, i, 0));
416 call_sv(ctor, G_SCALAR);
420 #if VMG_HAS_PERL(5, 8, 3)
421 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
423 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
433 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
434 MAGIC *mg, *moremagic;
436 if (SvTYPE(sv) >= SVt_PVMG) {
437 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
438 moremagic = mg->mg_moremagic;
439 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
440 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
452 /* ... Magic cast/dispell .................................................. */
455 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
457 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
459 prevmagic->mg_moremagic = moremagic;
461 SvMAGIC_set(sv, moremagic);
463 mg->mg_moremagic = NULL;
464 Safefree(mg->mg_ptr);
467 #endif /* VMG_UVAR */
469 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz, AV *args) {
470 #define vmg_cast(S, W, A) vmg_cast(aTHX_ (S), (W), (A))
471 MAGIC *mg = NULL, *moremagic = NULL;
474 U32 oldgmg = SvGMAGICAL(sv);
478 if (SvTYPE(sv) >= SVt_PVMG) {
479 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
480 moremagic = mg->mg_moremagic;
481 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
482 MGWIZ *z = SV2MGWIZ(mg->mg_ptr);
483 if (z->sig == w->sig)
491 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
492 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
493 mg->mg_private = SIG_WIZ;
496 mg->mg_flags |= MGf_COPY;
497 #endif /* MGf_COPY */
500 mg->mg_flags |= MGf_DUP;
504 mg->mg_flags |= MGf_LOCAL;
505 #endif /* MGf_LOCAL */
507 if (SvTYPE(sv) < SVt_PVHV)
510 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
511 * magic is actually never called for them. If the GMAGICAL flag was off before
512 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
513 * now on, then this wizard has get magic. Hence we can work around the
514 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
515 * has uvar callbacks, it will be turned back on later. */
516 if (!oldgmg && SvGMAGICAL(sv))
524 uf[0].uf_val = vmg_svt_val;
531 /* One uvar magic in the chain is enough. */
532 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
533 moremagic = mg->mg_moremagic;
534 if (mg->mg_type == PERL_MAGIC_uvar)
538 if (mg) { /* Found another uvar magic. */
539 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
540 if (olduf->uf_val == vmg_svt_val) {
541 /* It's our uvar magic, nothing to do. oldgmg was true. */
544 /* It's another uvar magic, backup it and replace it by ours. */
546 vmg_uvar_del(sv, prevmagic, mg, moremagic);
550 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
551 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
552 * handled by our uvar callback. */
554 #endif /* VMG_UVAR */
560 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
561 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
564 #endif /* VMG_UVAR */
565 MAGIC *mg, *prevmagic, *moremagic = NULL;
567 if (SvTYPE(sv) < SVt_PVMG)
570 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
571 moremagic = mg->mg_moremagic;
572 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
573 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
576 /* If the current has no uvar, short-circuit uvar deletion. */
577 uvars = w->uvar ? (uvars + 1) : 0;
578 #endif /* VMG_UVAR */
581 } else if (w->uvar) {
583 /* We can't break here since we need to find the ext magic to delete. */
584 #endif /* VMG_UVAR */
592 prevmagic->mg_moremagic = moremagic;
594 SvMAGIC_set(sv, moremagic);
596 mg->mg_moremagic = NULL;
598 /* Destroy private data */
599 if (mg->mg_obj != sv)
600 SvREFCNT_dec(mg->mg_obj);
601 /* Unreference the wizard */
602 SvREFCNT_dec((SV *) mg->mg_ptr);
606 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
607 /* mg was the first ext magic in the chain that had uvar */
609 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
610 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
611 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
621 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
622 moremagic = mg->mg_moremagic;
623 if (mg->mg_type == PERL_MAGIC_uvar)
627 uf = (struct ufuncs *) mg->mg_ptr;
628 /* assert(uf->uf_val == vmg_svt_val); */
629 if (uf[1].uf_val || uf[1].uf_set) {
630 /* Revert the original uvar magic. */
632 Renew(uf, 1, struct ufuncs);
633 mg->mg_ptr = (char *) uf;
634 mg->mg_len = sizeof(struct ufuncs);
636 /* Remove the uvar magic. */
637 vmg_uvar_del(sv, prevmagic, mg, moremagic);
641 #endif /* VMG_UVAR */
646 /* ... OP info ............................................................. */
648 #define VMG_OP_INFO_NAME 1
649 #define VMG_OP_INFO_OBJECT 2
652 STATIC perl_mutex vmg_op_name_init_mutex;
655 STATIC U32 vmg_op_name_init = 0;
656 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
658 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
659 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
661 case VMG_OP_INFO_NAME:
663 MUTEX_LOCK(&vmg_op_name_init_mutex);
665 if (!vmg_op_name_init) {
667 for (t = 0; t < OP_max; ++t)
668 vmg_op_name_len[t] = strlen(PL_op_name[t]);
669 vmg_op_name_init = 1;
672 MUTEX_UNLOCK(&vmg_op_name_init_mutex);
675 case VMG_OP_INFO_OBJECT: {
677 if (!MY_CXT.b__op_stashes[0]) {
680 for (c = 0; c < OPc_MAX; ++c)
681 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
690 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
691 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
696 case VMG_OP_INFO_NAME: {
697 OPCODE t = PL_op->op_type;
698 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
700 case VMG_OP_INFO_OBJECT: {
702 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
703 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
712 /* ... svt callbacks ....................................................... */
714 #define VMG_CB_CALL_SET_RET(D) \
719 ret = SvOK(svr) ? SvIV(svr) : (D); \
723 #define VMG_CB_CALL_ARGS_MASK 15
724 #define VMG_CB_CALL_ARGS_SHIFT 4
725 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
727 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
730 unsigned int i, args, opinfo;
734 args = flags & VMG_CB_CALL_ARGS_MASK;
735 flags >>= VMG_CB_CALL_ARGS_SHIFT;
736 opinfo = flags & VMG_CB_CALL_OPINFO;
742 EXTEND(SP, args + 1);
743 PUSHs(sv_2mortal(newRV_inc(sv)));
745 for (i = 0; i < args; ++i) {
746 SV *sva = va_arg(ap, SV *);
747 PUSHs(sva ? sva : &PL_sv_undef);
751 XPUSHs(vmg_op_info(opinfo));
754 call_sv(cb, G_SCALAR);
756 VMG_CB_CALL_SET_RET(0);
764 #define vmg_cb_call1(I, F, S, A1) \
765 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 1), (S), (A1))
766 #define vmg_cb_call2(I, F, S, A1, A2) \
767 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 2), (S), (A1), (A2))
768 #define vmg_cb_call3(I, F, S, A1, A2, A3) \
769 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 3), (S), (A1), (A2), (A3))
771 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
772 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
773 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
776 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
777 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
778 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
781 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
782 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
783 unsigned int opinfo = w->opinfo;
785 svtype t = SvTYPE(sv);
794 PUSHs(sv_2mortal(newRV_inc(sv)));
795 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
798 U8 *s = (U8 *) SvPV_const(sv, l);
800 len = utf8_length(s, s + l);
804 } else if (t == SVt_PVAV) {
805 len = av_len((AV *) sv) + 1;
812 XPUSHs(vmg_op_info(opinfo));
815 call_sv(w->cb_len, G_SCALAR);
817 VMG_CB_CALL_SET_RET(len);
822 return t == SVt_PVAV ? ret - 1 : ret;
825 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
826 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
827 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
830 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
832 #if VMG_HAS_PERL(5, 9, 5)
833 PERL_CONTEXT saved_cx;
836 unsigned int had_err, has_err, flags = G_SCALAR | G_EVAL;
841 /* Don't even bother if we are in global destruction - the wizard is prisoner
842 * of circular references and we are way beyond user realm */
846 w = SV2MGWIZ(mg->mg_ptr);
848 /* So that it survives the temp cleanup below */
851 #if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
852 /* The previous magic tokens were freed but the magic chain wasn't updated, so
853 * if you access the sv from the callback the old deleted magics will trigger
854 * and cause memory misreads. Change 32686 solved it that way : */
863 PUSHs(sv_2mortal(newRV_inc(sv)));
864 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
866 XPUSHs(vmg_op_info(w->opinfo));
869 had_err = SvTRUE(ERRSV);
873 #if VMG_HAS_PERL(5, 9, 5)
874 /* This context should not be used anymore, but since we croak in places the
875 * core doesn't even dare to, some pointers to it may remain in the upper call
876 * stack. Make sure call_sv() doesn't clobber it. */
877 if (cxstack_ix < cxstack_max)
878 cxix = cxstack_ix + 1;
880 cxix = Perl_cxinc(aTHX);
881 saved_cx = cxstack[cxix];
884 call_sv(w->cb_free, flags);
886 #if VMG_HAS_PERL(5, 9, 5)
887 cxstack[cxix] = saved_cx;
890 has_err = SvTRUE(ERRSV);
891 if (IN_PERL_COMPILETIME && !had_err && has_err)
894 VMG_CB_CALL_SET_RET(0);
899 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
900 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
903 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
904 * mg->mg_ptr reference count */
909 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
910 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
917 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
920 if (keylen == HEf_SVKEY) {
923 keysv = newSVpvn(key, keylen);
926 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
928 if (keylen != HEf_SVKEY) {
934 #endif /* MGf_COPY */
937 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
943 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
944 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
945 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
947 #endif /* MGf_LOCAL */
950 STATIC OP *vmg_pp_resetuvar(pTHX) {
951 SvRMAGICAL_on(cSVOP_sv);
955 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
958 SV *key = NULL, *newkey = NULL;
961 umg = mg_find(sv, PERL_MAGIC_uvar);
962 /* umg can't be NULL or we wouldn't be there. */
964 uf = (struct ufuncs *) umg->mg_ptr;
967 uf[1].uf_val(aTHX_ action, sv);
969 uf[1].uf_set(aTHX_ action, sv);
971 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
972 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
974 switch (mg->mg_type) {
977 case PERL_MAGIC_tied:
983 if (mg->mg_private != SIG_WIZ) continue;
984 w = SV2MGWIZ(mg->mg_ptr);
990 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
995 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
997 case HV_FETCH_ISSTORE:
998 case HV_FETCH_LVALUE:
999 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
1001 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
1003 case HV_FETCH_ISEXISTS:
1005 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
1009 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
1014 if (SvRMAGICAL(sv) && !tied) {
1015 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
1016 * mistaken for a tied hash by the rest of hv_common. It will be reset by
1017 * the op_ppaddr of a new fake op injected between the current and the next
1020 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
1022 NewOp(1101, svop, 1, SVOP);
1023 svop->op_type = OP_STUB;
1024 svop->op_ppaddr = vmg_pp_resetuvar;
1025 svop->op_next = o->op_next;
1028 o->op_next = (OP *) svop;
1035 #endif /* VMG_UVAR */
1037 /* ... Wizard destructor ................................................... */
1039 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
1043 if (PL_dirty) /* During global destruction, the context is already freed */
1047 #if VMG_MULTIPLICITY
1048 if (w->owner != aTHX)
1051 #endif /* VMG_MULTIPLICITY */
1055 if (hv_delete(MY_CXT.wizards, buf, sprintf(buf, "%u", w->sig), 0) != wiz)
1059 /* Unmortalize the wizard to avoid it being freed in weird places. */
1060 if (SvTEMP(wiz) && !SvREFCNT(wiz)) {
1061 const I32 myfloor = PL_tmps_floor;
1063 for (i = PL_tmps_ix; i > myfloor; --i) {
1064 if (PL_tmps_stack[i] == wiz)
1065 PL_tmps_stack[i] = NULL;
1069 if (w->cb_data) SvREFCNT_dec(SvRV(w->cb_data));
1070 if (w->cb_get) SvREFCNT_dec(SvRV(w->cb_get));
1071 if (w->cb_set) SvREFCNT_dec(SvRV(w->cb_set));
1072 if (w->cb_len) SvREFCNT_dec(SvRV(w->cb_len));
1073 if (w->cb_clear) SvREFCNT_dec(SvRV(w->cb_clear));
1074 if (w->cb_free) SvREFCNT_dec(SvRV(w->cb_free));
1076 if (w->cb_copy) SvREFCNT_dec(SvRV(w->cb_copy));
1077 #endif /* MGf_COPY */
1079 if (w->cb_dup) SvREFCNT_dec(SvRV(w->cb_dup));
1080 #endif /* MGf_DUP */
1082 if (w->cb_local) SvREFCNT_dec(SvRV(w->cb_local));
1083 #endif /* MGf_LOCAL */
1085 if (w->cb_fetch) SvREFCNT_dec(SvRV(w->cb_fetch));
1086 if (w->cb_store) SvREFCNT_dec(SvRV(w->cb_store));
1087 if (w->cb_exists) SvREFCNT_dec(SvRV(w->cb_exists));
1088 if (w->cb_delete) SvREFCNT_dec(SvRV(w->cb_delete));
1089 #endif /* VMG_UVAR */
1097 STATIC MGVTBL vmg_wizard_vtbl = {
1102 vmg_wizard_free, /* free */
1105 #endif /* MGf_COPY */
1108 #endif /* MGf_DUP */
1111 #endif /* MGf_LOCAL */
1114 STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
1115 #define vmg_sv2sig(S) vmg_sv2sig(aTHX_ (S))
1120 } else if (SvNOK(sv)) {
1122 } else if ((SvPOK(sv) && grok_number(SvPVX(sv), SvCUR(sv), NULL))) {
1125 croak(vmg_invalid_sig);
1128 if (sig < SIG_MIN || sig > SIG_MAX)
1129 croak(vmg_invalid_sig);
1134 STATIC U16 vmg_wizard_sig(pTHX_ SV *wiz) {
1135 #define vmg_wizard_sig(W) vmg_wizard_sig(aTHX_ (W))
1139 sig = SV2MGWIZ(SvRV(wiz))->sig;
1140 } else if (SvOK(wiz)) {
1141 sig = vmg_sv2sig(wiz);
1143 croak(vmg_invalid_wiz);
1149 SV **old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0);
1150 if (!(old && SV2MGWIZ(*old)))
1151 croak(vmg_invalid_wiz);
1157 STATIC SV *vmg_wizard_wiz(pTHX_ SV *wiz) {
1158 #define vmg_wizard_wiz(W) vmg_wizard_wiz(aTHX_ (W))
1163 #if VMG_MULTIPLICITY
1164 if (SV2MGWIZ(wiz)->owner == aTHX)
1166 #endif /* VMG_MULTIPLICITY */
1167 sig = SV2MGWIZ(wiz)->sig;
1168 } else if (SvOK(wiz)) {
1169 sig = vmg_sv2sig(wiz);
1171 croak(vmg_invalid_wiz);
1177 SV **old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0);
1178 if (!(old && SV2MGWIZ(*old)))
1179 croak(vmg_invalid_wiz);
1185 #define VMG_SET_CB(S, N) \
1187 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? newRV_inc(SvRV(cb)) : NULL;
1189 #define VMG_SET_SVT_CB(S, N) \
1191 if (SvOK(cb) && SvROK(cb)) { \
1192 t->svt_ ## N = vmg_svt_ ## N; \
1193 w->cb_ ## N = newRV_inc(SvRV(cb)); \
1195 t->svt_ ## N = NULL; \
1196 w->cb_ ## N = NULL; \
1201 #define VMG_CLONE_CB(N) \
1202 z->cb_ ## N = (w->cb_ ## N) ? newRV_inc(vmg_clone(SvRV(w->cb_ ## N), \
1206 STATIC MGWIZ *vmg_wizard_clone(pTHX_ const MGWIZ *w) {
1207 #define vmg_wizard_clone(W) vmg_wizard_clone(aTHX_ (W))
1212 Copy(w->vtbl, t, 1, MGVTBL);
1219 VMG_CLONE_CB(clear);
1223 #endif /* MGf_COPY */
1226 #endif /* MGf_DUP */
1228 VMG_CLONE_CB(local);
1229 #endif /* MGf_LOCAL */
1231 VMG_CLONE_CB(fetch);
1232 VMG_CLONE_CB(store);
1233 VMG_CLONE_CB(exists);
1234 VMG_CLONE_CB(delete);
1235 #endif /* VMG_UVAR */
1240 z->opinfo = w->opinfo;
1245 #endif /* VMG_THREADSAFE */
1247 /* --- XS ------------------------------------------------------------------ */
1249 MODULE = Variable::Magic PACKAGE = Variable::Magic
1257 MY_CXT.wizards = newHV();
1258 hv_iterinit(MY_CXT.wizards); /* Allocate iterator */
1259 MY_CXT.b__op_stashes[0] = NULL;
1261 MUTEX_INIT(&vmg_op_name_init_mutex);
1264 stash = gv_stashpv(__PACKAGE__, 1);
1265 newCONSTSUB(stash, "SIG_MIN", newSVuv(SIG_MIN));
1266 newCONSTSUB(stash, "SIG_MAX", newSVuv(SIG_MAX));
1267 newCONSTSUB(stash, "SIG_NBR", newSVuv(SIG_NBR));
1268 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1269 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1270 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1271 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1272 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1273 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1274 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID",
1275 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID));
1276 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1277 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1278 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1279 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1280 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1281 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1282 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1283 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1284 newCONSTSUB(stash, "VMG_FORKSAFE", newSVuv(VMG_FORKSAFE));
1285 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1286 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1296 U32 had_b__op_stash = 0;
1303 hv_iterinit(hv); /* Allocate iterator */
1304 hv_iterinit(MY_CXT.wizards);
1305 while ((key = hv_iternext(MY_CXT.wizards))) {
1307 char *sig = HePV(key, len);
1309 const MGWIZ *w = SV2MGWIZ(HeVAL(key));
1312 w = vmg_wizard_clone(w);
1314 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1315 mg->mg_private = SIG_WZO;
1317 sv = MGWIZ2SV(NULL);
1320 if (!hv_store(hv, sig, len, sv, HeHASH(key))) croak("%s during CLONE", vmg_globstorefail);
1322 for (c = 0; c < OPc_MAX; ++c) {
1323 if (MY_CXT.b__op_stashes[c])
1324 had_b__op_stash |= (((U32) 1) << c);
1329 MY_CXT.wizards = hv;
1330 for (c = 0; c < OPc_MAX; ++c) {
1331 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1332 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1336 #endif /* VMG_THREADSAFE */
1356 #endif /* MGf_COPY */
1359 #endif /* MGf_DUP */
1362 #endif /* MGf_LOCAL */
1365 #endif /* VMG_UVAR */
1366 ) { croak(vmg_wrongargnum); }
1371 sig = vmg_sv2sig(svsig);
1372 old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0);
1373 if (old && SV2MGWIZ(*old)) {
1374 ST(0) = sv_2mortal(newRV_inc(*old));
1384 VMG_SET_CB(ST(i++), data);
1386 w->opinfo = SvOK(cb) ? SvUV(cb) : 0;
1388 vmg_op_info_init(w->opinfo);
1389 VMG_SET_SVT_CB(ST(i++), get);
1390 VMG_SET_SVT_CB(ST(i++), set);
1391 VMG_SET_SVT_CB(ST(i++), len);
1392 VMG_SET_SVT_CB(ST(i++), clear);
1393 VMG_SET_SVT_CB(ST(i++), free);
1395 VMG_SET_SVT_CB(ST(i++), copy);
1396 #endif /* MGf_COPY */
1398 /* VMG_SET_SVT_CB(ST(i++), dup); */
1402 #endif /* MGf_DUP */
1404 VMG_SET_SVT_CB(ST(i++), local);
1405 #endif /* MGf_LOCAL */
1407 VMG_SET_CB(ST(i++), fetch);
1408 VMG_SET_CB(ST(i++), store);
1409 VMG_SET_CB(ST(i++), exists);
1410 VMG_SET_CB(ST(i++), delete);
1412 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1413 w->uvar = SvTRUE(cb) ? 2 : 1;
1416 #endif /* VMG_UVAR */
1417 #if VMG_MULTIPLICITY
1419 #endif /* VMG_MULTIPLICITY */
1424 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1425 mg->mg_private = SIG_WZO;
1428 if (!hv_store(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), sv, 0)) croak(vmg_globstorefail);
1430 RETVAL = newRV_noinc(sv);
1442 if (!hv_store(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), MGWIZ2SV(NULL), 0)) croak(vmg_globstorefail);
1443 RETVAL = newSVuv(sig);
1452 sig = vmg_wizard_sig(wiz);
1453 RETVAL = newSVuv(sig);
1457 SV *cast(SV *sv, SV *wiz, ...)
1458 PROTOTYPE: \[$@%&*]$@
1463 wiz = vmg_wizard_wiz(wiz);
1467 av_fill(args, items - 2);
1468 for (i = 2; i < items; ++i) {
1471 if (av_store(args, i - 2, arg) == NULL) croak(vmg_argstorefailed);
1474 ret = newSVuv(vmg_cast(SvRV(sv), wiz, args));
1481 getdata(SV *sv, SV *wiz)
1482 PROTOTYPE: \[$@%&*]$
1487 sig = vmg_wizard_sig(wiz);
1488 data = vmg_data_get(SvRV(sv), sig);
1494 SV *dispell(SV *sv, SV *wiz)
1495 PROTOTYPE: \[$@%&*]$
1499 sig = vmg_wizard_sig(wiz);
1500 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));