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 */
152 #ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
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 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
156 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
160 /* Applied to dev-5.11 as 34908 */
161 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908)
162 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
164 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
167 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
168 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
169 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
171 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
174 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969)
175 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
177 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
182 /* Bug-free mg_magical - see http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html - but specialized to our needs. */
183 STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
184 #define vmg_sv_magicuvar(S, U, L) vmg_sv_magicuvar(aTHX_ (S), (U), (L))
186 sv_magic(sv, NULL, PERL_MAGIC_uvar, uf, len);
187 /* uvar magic has set and get magic, hence this has set SVs_GMG and SVs_SMG. */
188 if ((mg = SvMAGIC(sv))) {
191 const MGVTBL* const vtbl = mg->mg_virtual;
193 if (vtbl->svt_clear) {
198 } while ((mg = mg->mg_moremagic));
202 #endif /* VMG_UVAR */
204 /* --- Stolen chunk of B --------------------------------------------------- */
222 STATIC const char *const vmg_opclassnames[] = {
237 STATIC opclass vmg_opclass(const OP *o) {
244 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
246 if (o->op_type == OP_SASSIGN)
247 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
249 if (o->op_type == OP_AELEMFAST) {
250 if (o->op_flags & OPf_SPECIAL)
261 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
265 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
282 case OA_PVOP_OR_SVOP:
283 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
288 case OA_BASEOP_OR_UNOP:
289 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
291 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
293 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
295 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
298 if (o->op_flags & OPf_STACKED)
300 else if (o->op_flags & OPf_SPECIAL)
309 /* --- Context-safe global data -------------------------------------------- */
311 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
315 HV *b__op_stashes[OPc_MAX];
320 /* --- Error messages ------------------------------------------------------ */
322 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
323 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
324 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
325 STATIC const char vmg_toomanysigs[] = "Too many magic signatures used";
326 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
327 STATIC const char vmg_globstorefail[] = "Couldn't store global wizard information";
329 /* --- Signatures ---------------------------------------------------------- */
331 #define SIG_MIN ((U16) 0u)
332 #define SIG_MAX ((U16) ((1u << 16) - 1))
333 #define SIG_NBR (SIG_MAX - SIG_MIN + 1)
335 #define SIG_WZO ((U16) (0x3891))
336 #define SIG_WIZ ((U16) (0x3892))
338 /* ... Generate signatures ................................................. */
340 STATIC U16 vmg_gensig(pTHX) {
341 #define vmg_gensig() vmg_gensig(aTHX)
346 if (HvKEYS(MY_CXT.wizards) >= SIG_NBR) croak(vmg_toomanysigs);
349 sig = SIG_NBR * Drand01() + SIG_MIN;
350 } while (hv_exists(MY_CXT.wizards, buf, sprintf(buf, "%u", sig)));
355 /* --- MGWIZ structure ----------------------------------------------------- */
365 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
368 #endif /* MGf_COPY */
374 #endif /* MGf_LOCAL */
376 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
377 #endif /* VMG_UVAR */
380 #endif /* VMG_MULTIPLICITY */
383 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
384 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
386 /* ... Construct private data .............................................. */
388 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
389 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
391 I32 i, alen = (args == NULL) ? 0 : av_len(args);
399 EXTEND(SP, alen + 1);
400 PUSHs(sv_2mortal(newRV_inc(sv)));
401 for (i = 0; i < alen; ++i)
402 PUSHs(*av_fetch(args, i, 0));
405 call_sv(ctor, G_SCALAR);
409 #if VMG_HAS_PERL(5, 8, 3)
410 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
412 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
422 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
423 MAGIC *mg, *moremagic;
425 if (SvTYPE(sv) >= SVt_PVMG) {
426 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
427 moremagic = mg->mg_moremagic;
428 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
429 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
441 /* ... Magic cast/dispell .................................................. */
444 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
446 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
448 prevmagic->mg_moremagic = moremagic;
450 SvMAGIC_set(sv, moremagic);
452 mg->mg_moremagic = NULL;
453 Safefree(mg->mg_ptr);
456 #endif /* VMG_UVAR */
458 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz, AV *args) {
459 #define vmg_cast(S, W, A) vmg_cast(aTHX_ (S), (W), (A))
460 MAGIC *mg = NULL, *moremagic = NULL;
463 U32 oldgmg = SvGMAGICAL(sv);
467 if (SvTYPE(sv) >= SVt_PVMG) {
468 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
469 moremagic = mg->mg_moremagic;
470 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
471 MGWIZ *z = SV2MGWIZ(mg->mg_ptr);
472 if (z->sig == w->sig)
480 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
481 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
482 mg->mg_private = SIG_WIZ;
485 mg->mg_flags |= MGf_COPY;
486 #endif /* MGf_COPY */
489 mg->mg_flags |= MGf_DUP;
493 mg->mg_flags |= MGf_LOCAL;
494 #endif /* MGf_LOCAL */
496 if (SvTYPE(sv) < SVt_PVHV)
499 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
500 * magic is actually never called for them. If the GMAGICAL flag was off before
501 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
502 * now on, then this wizard has get magic. Hence we can work around the
503 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
504 * has uvar callbacks, it will be turned back on later. */
505 if (!oldgmg && SvGMAGICAL(sv))
513 uf[0].uf_val = vmg_svt_val;
520 /* One uvar magic in the chain is enough. */
521 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
522 moremagic = mg->mg_moremagic;
523 if (mg->mg_type == PERL_MAGIC_uvar)
527 if (mg) { /* Found another uvar magic. */
528 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
529 if (olduf->uf_val == vmg_svt_val) {
530 /* It's our uvar magic, nothing to do. oldgmg was true. */
533 /* It's another uvar magic, backup it and replace it by ours. */
535 vmg_uvar_del(sv, prevmagic, mg, moremagic);
539 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
540 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
541 * handled by our uvar callback. */
543 #endif /* VMG_UVAR */
549 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
550 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
553 #endif /* VMG_UVAR */
554 MAGIC *mg, *prevmagic, *moremagic = NULL;
556 if (SvTYPE(sv) < SVt_PVMG)
559 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
560 moremagic = mg->mg_moremagic;
561 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
562 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
565 /* If the current has no uvar, short-circuit uvar deletion. */
566 uvars = w->uvar ? (uvars + 1) : 0;
567 #endif /* VMG_UVAR */
570 } else if (w->uvar) {
572 /* We can't break here since we need to find the ext magic to delete. */
573 #endif /* VMG_UVAR */
581 prevmagic->mg_moremagic = moremagic;
583 SvMAGIC_set(sv, moremagic);
585 mg->mg_moremagic = NULL;
587 /* Destroy private data */
588 if (mg->mg_obj != sv)
589 SvREFCNT_dec(mg->mg_obj);
590 /* Unreference the wizard */
591 SvREFCNT_dec((SV *) mg->mg_ptr);
595 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
596 /* mg was the first ext magic in the chain that had uvar */
598 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
599 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
600 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
610 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
611 moremagic = mg->mg_moremagic;
612 if (mg->mg_type == PERL_MAGIC_uvar)
616 uf = (struct ufuncs *) mg->mg_ptr;
617 /* assert(uf->uf_val == vmg_svt_val); */
618 if (uf[1].uf_val || uf[1].uf_set) {
619 /* Revert the original uvar magic. */
621 Renew(uf, 1, struct ufuncs);
622 mg->mg_ptr = (char *) uf;
623 mg->mg_len = sizeof(struct ufuncs);
625 /* Remove the uvar magic. */
626 vmg_uvar_del(sv, prevmagic, mg, moremagic);
630 #endif /* VMG_UVAR */
635 /* ... OP info ............................................................. */
637 #define VMG_OP_INFO_NAME 1
638 #define VMG_OP_INFO_OBJECT 2
641 STATIC perl_mutex vmg_op_name_init_mutex;
644 STATIC U32 vmg_op_name_init = 0;
645 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
647 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
648 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
650 case VMG_OP_INFO_NAME:
652 MUTEX_LOCK(&vmg_op_name_init_mutex);
654 if (!vmg_op_name_init) {
656 for (t = 0; t < OP_max; ++t)
657 vmg_op_name_len[t] = strlen(PL_op_name[t]);
658 vmg_op_name_init = 1;
661 MUTEX_UNLOCK(&vmg_op_name_init_mutex);
664 case VMG_OP_INFO_OBJECT: {
666 if (!MY_CXT.b__op_stashes[0]) {
669 for (c = 0; c < OPc_MAX; ++c)
670 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
679 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
680 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
685 case VMG_OP_INFO_NAME: {
686 OPCODE t = PL_op->op_type;
687 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
689 case VMG_OP_INFO_OBJECT: {
691 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
692 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
701 /* ... svt callbacks ....................................................... */
703 #define VMG_CB_CALL_SET_RET(D) \
708 ret = SvOK(svr) ? SvIV(svr) : (D); \
712 #define VMG_CB_CALL_ARGS_MASK 15
713 #define VMG_CB_CALL_ARGS_SHIFT 4
714 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
716 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
719 unsigned int i, args, opinfo;
723 args = flags & VMG_CB_CALL_ARGS_MASK;
724 flags >>= VMG_CB_CALL_ARGS_SHIFT;
725 opinfo = flags & VMG_CB_CALL_OPINFO;
731 EXTEND(SP, args + 1);
732 PUSHs(sv_2mortal(newRV_inc(sv)));
734 for (i = 0; i < args; ++i) {
735 SV *sva = va_arg(ap, SV *);
736 PUSHs(sva ? sva : &PL_sv_undef);
740 XPUSHs(vmg_op_info(opinfo));
743 call_sv(cb, G_SCALAR);
745 VMG_CB_CALL_SET_RET(0);
753 #define vmg_cb_call1(I, F, S, A1) \
754 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 1), (S), (A1))
755 #define vmg_cb_call2(I, F, S, A1, A2) \
756 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 2), (S), (A1), (A2))
757 #define vmg_cb_call3(I, F, S, A1, A2, A3) \
758 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 3), (S), (A1), (A2), (A3))
760 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
761 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
762 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
765 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
766 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
767 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
770 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
771 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
772 unsigned int opinfo = w->opinfo;
774 svtype t = SvTYPE(sv);
783 PUSHs(sv_2mortal(newRV_inc(sv)));
784 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
787 U8 *s = (U8 *) SvPV_const(sv, l);
789 len = utf8_length(s, s + l);
793 } else if (t == SVt_PVAV) {
794 len = av_len((AV *) sv) + 1;
801 XPUSHs(vmg_op_info(opinfo));
804 call_sv(w->cb_len, G_SCALAR);
806 VMG_CB_CALL_SET_RET(len);
811 return t == SVt_PVAV ? ret - 1 : ret;
814 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
815 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
816 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
819 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
821 #if VMG_HAS_PERL(5, 9, 5)
822 PERL_CONTEXT saved_cx;
825 unsigned int had_err, has_err, flags = G_SCALAR | G_EVAL;
830 /* Don't even bother if we are in global destruction - the wizard is prisoner
831 * of circular references and we are way beyond user realm */
835 w = SV2MGWIZ(mg->mg_ptr);
837 /* So that it survives the temp cleanup below */
840 #if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
841 /* The previous magic tokens were freed but the magic chain wasn't updated, so
842 * if you access the sv from the callback the old deleted magics will trigger
843 * and cause memory misreads. Change 32686 solved it that way : */
852 PUSHs(sv_2mortal(newRV_inc(sv)));
853 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
855 XPUSHs(vmg_op_info(w->opinfo));
858 had_err = SvTRUE(ERRSV);
862 #if VMG_HAS_PERL(5, 9, 5)
863 /* This context should not be used anymore, but since we croak in places the
864 * core doesn't even dare to, some pointers to it may remain in the upper call
865 * stack. Make sure call_sv() doesn't clobber it. */
866 if (cxstack_ix < cxstack_max)
867 cxix = cxstack_ix + 1;
869 cxix = Perl_cxinc(aTHX);
870 saved_cx = cxstack[cxix];
873 call_sv(w->cb_free, flags);
875 #if VMG_HAS_PERL(5, 9, 5)
876 cxstack[cxix] = saved_cx;
879 has_err = SvTRUE(ERRSV);
880 if (IN_PERL_COMPILETIME && !had_err && has_err)
883 VMG_CB_CALL_SET_RET(0);
888 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
889 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
892 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
893 * mg->mg_ptr reference count */
898 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
899 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
906 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
909 if (keylen == HEf_SVKEY) {
912 keysv = newSVpvn(key, keylen);
915 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
917 if (keylen != HEf_SVKEY) {
923 #endif /* MGf_COPY */
926 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
932 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
933 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
934 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
936 #endif /* MGf_LOCAL */
939 STATIC OP *vmg_pp_resetuvar(pTHX) {
940 SvRMAGICAL_on(cSVOP_sv);
944 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
947 SV *key = NULL, *newkey = NULL;
950 umg = mg_find(sv, PERL_MAGIC_uvar);
951 /* umg can't be NULL or we wouldn't be there. */
953 uf = (struct ufuncs *) umg->mg_ptr;
956 uf[1].uf_val(aTHX_ action, sv);
958 uf[1].uf_set(aTHX_ action, sv);
960 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
961 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
963 switch (mg->mg_type) {
966 case PERL_MAGIC_tied:
972 if (mg->mg_private != SIG_WIZ) continue;
973 w = SV2MGWIZ(mg->mg_ptr);
979 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
984 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
986 case HV_FETCH_ISSTORE:
987 case HV_FETCH_LVALUE:
988 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
990 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
992 case HV_FETCH_ISEXISTS:
994 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
998 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
1003 if (SvRMAGICAL(sv) && !tied) {
1004 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
1005 * mistaken for a tied hash by the rest of hv_common. It will be reset by
1006 * the op_ppaddr of a new fake op injected between the current and the next
1009 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
1011 NewOp(1101, svop, 1, SVOP);
1012 svop->op_type = OP_STUB;
1013 svop->op_ppaddr = vmg_pp_resetuvar;
1014 svop->op_next = o->op_next;
1017 o->op_next = (OP *) svop;
1024 #endif /* VMG_UVAR */
1026 /* ... Wizard destructor ................................................... */
1028 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
1032 if (PL_dirty) /* During global destruction, the context is already freed */
1036 #if VMG_MULTIPLICITY
1037 if (w->owner != aTHX)
1040 #endif /* VMG_MULTIPLICITY */
1044 if (hv_delete(MY_CXT.wizards, buf, sprintf(buf, "%u", w->sig), 0) != wiz)
1048 /* Unmortalize the wizard to avoid it being freed in weird places. */
1049 if (SvTEMP(wiz) && !SvREFCNT(wiz)) {
1050 const I32 myfloor = PL_tmps_floor;
1052 for (i = PL_tmps_ix; i > myfloor; --i) {
1053 if (PL_tmps_stack[i] == wiz)
1054 PL_tmps_stack[i] = NULL;
1058 if (w->cb_data) SvREFCNT_dec(SvRV(w->cb_data));
1059 if (w->cb_get) SvREFCNT_dec(SvRV(w->cb_get));
1060 if (w->cb_set) SvREFCNT_dec(SvRV(w->cb_set));
1061 if (w->cb_len) SvREFCNT_dec(SvRV(w->cb_len));
1062 if (w->cb_clear) SvREFCNT_dec(SvRV(w->cb_clear));
1063 if (w->cb_free) SvREFCNT_dec(SvRV(w->cb_free));
1065 if (w->cb_copy) SvREFCNT_dec(SvRV(w->cb_copy));
1066 #endif /* MGf_COPY */
1068 if (w->cb_dup) SvREFCNT_dec(SvRV(w->cb_dup));
1069 #endif /* MGf_DUP */
1071 if (w->cb_local) SvREFCNT_dec(SvRV(w->cb_local));
1072 #endif /* MGf_LOCAL */
1074 if (w->cb_fetch) SvREFCNT_dec(SvRV(w->cb_fetch));
1075 if (w->cb_store) SvREFCNT_dec(SvRV(w->cb_store));
1076 if (w->cb_exists) SvREFCNT_dec(SvRV(w->cb_exists));
1077 if (w->cb_delete) SvREFCNT_dec(SvRV(w->cb_delete));
1078 #endif /* VMG_UVAR */
1086 STATIC MGVTBL vmg_wizard_vtbl = {
1091 vmg_wizard_free, /* free */
1094 #endif /* MGf_COPY */
1097 #endif /* MGf_DUP */
1100 #endif /* MGf_LOCAL */
1103 STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
1104 #define vmg_sv2sig(S) vmg_sv2sig(aTHX_ (S))
1109 } else if (SvNOK(sv)) {
1111 } else if ((SvPOK(sv) && grok_number(SvPVX(sv), SvCUR(sv), NULL))) {
1114 croak(vmg_invalid_sig);
1117 if (sig < SIG_MIN || sig > SIG_MAX)
1118 croak(vmg_invalid_sig);
1123 STATIC U16 vmg_wizard_sig(pTHX_ SV *wiz) {
1124 #define vmg_wizard_sig(W) vmg_wizard_sig(aTHX_ (W))
1128 sig = SV2MGWIZ(SvRV(wiz))->sig;
1129 } else if (SvOK(wiz)) {
1130 sig = vmg_sv2sig(wiz);
1132 croak(vmg_invalid_wiz);
1138 SV **old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0);
1139 if (!(old && SV2MGWIZ(*old)))
1140 croak(vmg_invalid_wiz);
1146 STATIC SV *vmg_wizard_wiz(pTHX_ SV *wiz) {
1147 #define vmg_wizard_wiz(W) vmg_wizard_wiz(aTHX_ (W))
1152 #if VMG_MULTIPLICITY
1153 if (SV2MGWIZ(wiz)->owner == aTHX)
1155 #endif /* VMG_MULTIPLICITY */
1156 sig = SV2MGWIZ(wiz)->sig;
1157 } else if (SvOK(wiz)) {
1158 sig = vmg_sv2sig(wiz);
1160 croak(vmg_invalid_wiz);
1166 SV **old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0);
1167 if (!(old && SV2MGWIZ(*old)))
1168 croak(vmg_invalid_wiz);
1174 #define VMG_SET_CB(S, N) \
1176 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? newRV_inc(SvRV(cb)) : NULL;
1178 #define VMG_SET_SVT_CB(S, N) \
1180 if (SvOK(cb) && SvROK(cb)) { \
1181 t->svt_ ## N = vmg_svt_ ## N; \
1182 w->cb_ ## N = newRV_inc(SvRV(cb)); \
1184 t->svt_ ## N = NULL; \
1185 w->cb_ ## N = NULL; \
1190 #define VMG_CLONE_CB(N) \
1191 z->cb_ ## N = (w->cb_ ## N) ? newRV_inc(vmg_clone(SvRV(w->cb_ ## N), \
1195 STATIC MGWIZ *vmg_wizard_clone(pTHX_ const MGWIZ *w) {
1196 #define vmg_wizard_clone(W) vmg_wizard_clone(aTHX_ (W))
1201 Copy(w->vtbl, t, 1, MGVTBL);
1208 VMG_CLONE_CB(clear);
1212 #endif /* MGf_COPY */
1215 #endif /* MGf_DUP */
1217 VMG_CLONE_CB(local);
1218 #endif /* MGf_LOCAL */
1220 VMG_CLONE_CB(fetch);
1221 VMG_CLONE_CB(store);
1222 VMG_CLONE_CB(exists);
1223 VMG_CLONE_CB(delete);
1224 #endif /* VMG_UVAR */
1229 z->opinfo = w->opinfo;
1234 #endif /* VMG_THREADSAFE */
1236 /* --- XS ------------------------------------------------------------------ */
1238 MODULE = Variable::Magic PACKAGE = Variable::Magic
1246 MY_CXT.wizards = newHV();
1247 hv_iterinit(MY_CXT.wizards); /* Allocate iterator */
1248 MY_CXT.b__op_stashes[0] = NULL;
1250 MUTEX_INIT(&vmg_op_name_init_mutex);
1253 stash = gv_stashpv(__PACKAGE__, 1);
1254 newCONSTSUB(stash, "SIG_MIN", newSVuv(SIG_MIN));
1255 newCONSTSUB(stash, "SIG_MAX", newSVuv(SIG_MAX));
1256 newCONSTSUB(stash, "SIG_NBR", newSVuv(SIG_NBR));
1257 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1258 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1259 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1260 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1261 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1262 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1263 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1264 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1265 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1266 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1267 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1268 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1269 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1270 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1271 newCONSTSUB(stash, "VMG_FORKSAFE", newSVuv(VMG_FORKSAFE));
1272 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1273 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1283 U32 had_b__op_stash = 0;
1290 hv_iterinit(hv); /* Allocate iterator */
1291 hv_iterinit(MY_CXT.wizards);
1292 while ((key = hv_iternext(MY_CXT.wizards))) {
1294 char *sig = HePV(key, len);
1296 const MGWIZ *w = SV2MGWIZ(HeVAL(key));
1299 w = vmg_wizard_clone(w);
1301 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1302 mg->mg_private = SIG_WZO;
1304 sv = MGWIZ2SV(NULL);
1307 if (!hv_store(hv, sig, len, sv, HeHASH(key))) croak("%s during CLONE", vmg_globstorefail);
1309 for (c = 0; c < OPc_MAX; ++c) {
1310 if (MY_CXT.b__op_stashes[c])
1311 had_b__op_stash |= (((U32) 1) << c);
1316 MY_CXT.wizards = hv;
1317 for (c = 0; c < OPc_MAX; ++c) {
1318 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1319 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1323 #endif /* VMG_THREADSAFE */
1343 #endif /* MGf_COPY */
1346 #endif /* MGf_DUP */
1349 #endif /* MGf_LOCAL */
1352 #endif /* VMG_UVAR */
1353 ) { croak(vmg_wrongargnum); }
1358 sig = vmg_sv2sig(svsig);
1359 old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0);
1360 if (old && SV2MGWIZ(*old)) {
1361 ST(0) = sv_2mortal(newRV_inc(*old));
1371 VMG_SET_CB(ST(i++), data);
1373 w->opinfo = SvOK(cb) ? SvUV(cb) : 0;
1375 vmg_op_info_init(w->opinfo);
1376 VMG_SET_SVT_CB(ST(i++), get);
1377 VMG_SET_SVT_CB(ST(i++), set);
1378 VMG_SET_SVT_CB(ST(i++), len);
1379 VMG_SET_SVT_CB(ST(i++), clear);
1380 VMG_SET_SVT_CB(ST(i++), free);
1382 VMG_SET_SVT_CB(ST(i++), copy);
1383 #endif /* MGf_COPY */
1385 /* VMG_SET_SVT_CB(ST(i++), dup); */
1389 #endif /* MGf_DUP */
1391 VMG_SET_SVT_CB(ST(i++), local);
1392 #endif /* MGf_LOCAL */
1394 VMG_SET_CB(ST(i++), fetch);
1395 VMG_SET_CB(ST(i++), store);
1396 VMG_SET_CB(ST(i++), exists);
1397 VMG_SET_CB(ST(i++), delete);
1399 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1400 w->uvar = SvTRUE(cb) ? 2 : 1;
1403 #endif /* VMG_UVAR */
1404 #if VMG_MULTIPLICITY
1406 #endif /* VMG_MULTIPLICITY */
1411 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1412 mg->mg_private = SIG_WZO;
1415 if (!hv_store(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), sv, 0)) croak(vmg_globstorefail);
1417 RETVAL = newRV_noinc(sv);
1429 if (!hv_store(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), MGWIZ2SV(NULL), 0)) croak(vmg_globstorefail);
1430 RETVAL = newSVuv(sig);
1439 sig = vmg_wizard_sig(wiz);
1440 RETVAL = newSVuv(sig);
1444 SV *cast(SV *sv, SV *wiz, ...)
1445 PROTOTYPE: \[$@%&*]$@
1450 wiz = vmg_wizard_wiz(wiz);
1454 av_fill(args, items - 2);
1455 for (i = 2; i < items; ++i) {
1458 if (av_store(args, i - 2, arg) == NULL) croak(vmg_argstorefailed);
1461 ret = newSVuv(vmg_cast(SvRV(sv), wiz, args));
1468 getdata(SV *sv, SV *wiz)
1469 PROTOTYPE: \[$@%&*]$
1474 sig = vmg_wizard_sig(wiz);
1475 data = vmg_data_get(SvRV(sv), sig);
1481 SV *dispell(SV *sv, SV *wiz)
1482 PROTOTYPE: \[$@%&*]$
1486 sig = vmg_wizard_sig(wiz);
1487 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));