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 #ifndef VMG_MULTIPLICITY
40 # if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
41 # define VMG_MULTIPLICITY 1
43 # define VMG_MULTIPLICITY 0
46 #if VMG_MULTIPLICITY && !defined(tTHX)
47 # define tTHX PerlInterpreter*
50 #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))
51 # define VMG_THREADSAFE 1
53 # define MY_CXT_CLONE \
55 my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
56 Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
57 sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
60 # define VMG_THREADSAFE 0
62 # define dMY_CXT dNOOP
64 # define MY_CXT vmg_globaldata
66 # define START_MY_CXT STATIC my_cxt_t MY_CXT;
68 # define MY_CXT_INIT NOOP
70 # define MY_CXT_CLONE NOOP
75 STATIC SV *vmg_clone(pTHX_ SV *sv, tTHX owner) {
76 #define vmg_clone(P, O) vmg_clone(aTHX_ (P), (O))
78 param.stashes = NULL; /* don't need it unless sv is a PVHV */
80 param.proto_perl = owner;
81 return sv_dup(sv, ¶m);
84 #endif /* VMG_THREADSAFE */
86 /* --- Compatibility ------------------------------------------------------- */
89 # define Newx(v, n, c) New(0, v, n, c)
93 # define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
97 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
101 # define SvPV_const SvPV
104 #ifndef PERL_MAGIC_ext
105 # define PERL_MAGIC_ext '~'
108 #ifndef PERL_MAGIC_tied
109 # define PERL_MAGIC_tied 'P'
124 #ifndef IN_PERL_COMPILETIME
125 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
128 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
129 # ifndef PL_error_count
130 # define PL_error_count PL_parser->error_count
133 # ifndef PL_error_count
134 # define PL_error_count PL_Ierror_count
138 /* uvar magic and Hash::Util::FieldHash were commited with 28419 */
139 #if VMG_HAS_PERL_MAINT(5, 9, 4, 28419) || VMG_HAS_PERL(5, 10, 0)
145 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160 */
146 #ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
147 # if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
148 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
150 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
154 /* Applied to dev-5.11 as 34908 */
155 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908)
156 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
158 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
161 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
162 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
163 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
165 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
168 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969)
169 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
171 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
176 /* Bug-free mg_magical - see http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html - but specialized to our needs. */
177 STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
178 #define vmg_sv_magicuvar(S, U, L) vmg_sv_magicuvar(aTHX_ (S), (U), (L))
180 sv_magic(sv, NULL, PERL_MAGIC_uvar, uf, len);
181 /* uvar magic has set and get magic, hence this has set SVs_GMG and SVs_SMG. */
182 if ((mg = SvMAGIC(sv))) {
185 const MGVTBL* const vtbl = mg->mg_virtual;
187 if (vtbl->svt_clear) {
192 } while ((mg = mg->mg_moremagic));
196 #endif /* VMG_UVAR */
198 /* --- Stolen chunk of B --------------------------------------------------- */
216 STATIC const char *const vmg_opclassnames[] = {
231 STATIC opclass vmg_opclass(const OP *o) {
236 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
238 if (o->op_type == OP_SASSIGN)
239 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
241 if (o->op_type == OP_AELEMFAST) {
242 if (o->op_flags & OPf_SPECIAL)
253 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
257 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
274 case OA_PVOP_OR_SVOP:
275 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
280 case OA_BASEOP_OR_UNOP:
281 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
283 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
285 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
287 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
290 if (o->op_flags & OPf_STACKED)
292 else if (o->op_flags & OPf_SPECIAL)
301 /* --- Context-safe global data -------------------------------------------- */
303 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
307 HV *b__op_stashes[OPc_MAX];
312 /* --- Error messages ------------------------------------------------------ */
314 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
315 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
316 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
317 STATIC const char vmg_toomanysigs[] = "Too many magic signatures used";
318 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
319 STATIC const char vmg_globstorefail[] = "Couldn't store global wizard information";
321 /* --- Signatures ---------------------------------------------------------- */
323 #define SIG_MIN ((U16) 0u)
324 #define SIG_MAX ((U16) ((1u << 16) - 1))
325 #define SIG_NBR (SIG_MAX - SIG_MIN + 1)
327 #define SIG_WZO ((U16) (0x3891))
328 #define SIG_WIZ ((U16) (0x3892))
330 /* ... Generate signatures ................................................. */
332 STATIC U16 vmg_gensig(pTHX) {
333 #define vmg_gensig() vmg_gensig(aTHX)
338 if (HvKEYS(MY_CXT.wizards) >= SIG_NBR)
339 croak(vmg_toomanysigs);
342 sig = SIG_NBR * Drand01() + SIG_MIN;
343 } while (hv_exists(MY_CXT.wizards, buf, sprintf(buf, "%u", sig)));
348 /* --- MGWIZ structure ----------------------------------------------------- */
358 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
361 #endif /* MGf_COPY */
367 #endif /* MGf_LOCAL */
369 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
370 #endif /* VMG_UVAR */
373 #endif /* VMG_MULTIPLICITY */
376 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
377 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
379 /* ... Construct private data .............................................. */
381 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
382 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
384 I32 i, alen = (args == NULL) ? 0 : av_len(args);
392 EXTEND(SP, alen + 1);
393 PUSHs(sv_2mortal(newRV_inc(sv)));
394 for (i = 0; i < alen; ++i)
395 PUSHs(*av_fetch(args, i, 0));
398 call_sv(ctor, G_SCALAR);
402 #if VMG_HAS_PERL(5, 8, 3)
403 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
405 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
415 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
416 MAGIC *mg, *moremagic;
418 if (SvTYPE(sv) >= SVt_PVMG) {
419 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
420 moremagic = mg->mg_moremagic;
421 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
422 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
434 /* ... Magic cast/dispell .................................................. */
437 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
439 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
441 prevmagic->mg_moremagic = moremagic;
443 SvMAGIC_set(sv, moremagic);
445 mg->mg_moremagic = NULL;
446 Safefree(mg->mg_ptr);
449 #endif /* VMG_UVAR */
451 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz, AV *args) {
452 #define vmg_cast(S, W, A) vmg_cast(aTHX_ (S), (W), (A))
453 MAGIC *mg = NULL, *moremagic = NULL;
456 U32 oldgmg = SvGMAGICAL(sv);
460 if (SvTYPE(sv) >= SVt_PVMG) {
461 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
462 moremagic = mg->mg_moremagic;
463 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
464 MGWIZ *z = SV2MGWIZ(mg->mg_ptr);
465 if (z->sig == w->sig)
473 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
474 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
475 mg->mg_private = SIG_WIZ;
478 mg->mg_flags |= MGf_COPY;
479 #endif /* MGf_COPY */
482 mg->mg_flags |= MGf_DUP;
486 mg->mg_flags |= MGf_LOCAL;
487 #endif /* MGf_LOCAL */
489 if (SvTYPE(sv) < SVt_PVHV)
492 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
493 * magic is actually never called for them. If the GMAGICAL flag was off before
494 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
495 * now on, then this wizard has get magic. Hence we can work around the
496 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
497 * has uvar callbacks, it will be turned back on later. */
498 if (!oldgmg && SvGMAGICAL(sv))
506 uf[0].uf_val = vmg_svt_val;
513 /* One uvar magic in the chain is enough. */
514 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
515 moremagic = mg->mg_moremagic;
516 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
519 if (mg) { /* Found another uvar magic. */
520 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
521 if (olduf->uf_val == vmg_svt_val) {
522 /* It's our uvar magic, nothing to do. oldgmg was true. */
525 /* It's another uvar magic, backup it and replace it by ours. */
527 vmg_uvar_del(sv, prevmagic, mg, moremagic);
531 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
532 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
533 * handled by our uvar callback. */
535 #endif /* VMG_UVAR */
541 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
542 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
545 #endif /* VMG_UVAR */
546 MAGIC *mg, *prevmagic, *moremagic = NULL;
548 if (SvTYPE(sv) < SVt_PVMG) { return 0; }
550 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
551 moremagic = mg->mg_moremagic;
552 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
553 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
556 /* If the current has no uvar, short-circuit uvar deletion. */
557 uvars = w->uvar ? (uvars + 1) : 0;
558 #endif /* VMG_UVAR */
561 } else if (w->uvar) {
563 /* We can't break here since we need to find the ext magic to delete. */
564 #endif /* VMG_UVAR */
568 if (!mg) { return 0; }
571 prevmagic->mg_moremagic = moremagic;
573 SvMAGIC_set(sv, moremagic);
575 mg->mg_moremagic = NULL;
577 if (mg->mg_obj != sv) { SvREFCNT_dec(mg->mg_obj); } /* Destroy private data */
578 SvREFCNT_dec((SV *) mg->mg_ptr); /* Unreference the wizard */
582 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
583 /* mg was the first ext magic in the chain that had uvar */
585 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
586 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
587 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
597 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
598 moremagic = mg->mg_moremagic;
599 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
602 uf = (struct ufuncs *) mg->mg_ptr;
603 /* assert(uf->uf_val == vmg_svt_val); */
604 if (uf[1].uf_val || uf[1].uf_set) {
605 /* Revert the original uvar magic. */
607 Renew(uf, 1, struct ufuncs);
608 mg->mg_ptr = (char *) uf;
609 mg->mg_len = sizeof(struct ufuncs);
611 /* Remove the uvar magic. */
612 vmg_uvar_del(sv, prevmagic, mg, moremagic);
616 #endif /* VMG_UVAR */
621 /* ... OP info ............................................................. */
623 #define VMG_OP_INFO_NAME 1
624 #define VMG_OP_INFO_OBJECT 2
626 STATIC U32 vmg_op_name_init = 0;
627 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
629 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
630 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
632 case VMG_OP_INFO_NAME:
633 if (!vmg_op_name_init) {
635 for (t = 0; t < OP_max; ++t)
636 vmg_op_name_len[t] = strlen(PL_op_name[t]);
637 vmg_op_name_init = 1;
640 case VMG_OP_INFO_OBJECT: {
642 if (!MY_CXT.b__op_stashes[0]) {
645 for (c = 0; c < OPc_MAX; ++c)
646 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
655 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
656 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
661 case VMG_OP_INFO_NAME: {
662 OPCODE t = PL_op->op_type;
663 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
665 case VMG_OP_INFO_OBJECT: {
667 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
668 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
677 /* ... svt callbacks ....................................................... */
679 #define VMG_CB_CALL_SET_RET(D) \
684 ret = SvOK(svr) ? SvIV(svr) : (D); \
688 #define VMG_CB_CALL_ARGS_MASK 15
689 #define VMG_CB_CALL_ARGS_SHIFT 4
690 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
692 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
695 unsigned int i, args, opinfo;
699 args = flags & VMG_CB_CALL_ARGS_MASK;
700 flags >>= VMG_CB_CALL_ARGS_SHIFT;
701 opinfo = flags & VMG_CB_CALL_OPINFO;
707 EXTEND(SP, args + 1);
708 PUSHs(sv_2mortal(newRV_inc(sv)));
710 for (i = 0; i < args; ++i) {
711 SV *sva = va_arg(ap, SV *);
712 PUSHs(sva ? sva : &PL_sv_undef);
716 XPUSHs(vmg_op_info(opinfo));
719 call_sv(cb, G_SCALAR);
721 VMG_CB_CALL_SET_RET(0);
729 #define vmg_cb_call1(I, F, S, A1) \
730 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 1), (S), (A1))
731 #define vmg_cb_call2(I, F, S, A1, A2) \
732 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 2), (S), (A1), (A2))
733 #define vmg_cb_call3(I, F, S, A1, A2, A3) \
734 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 3), (S), (A1), (A2), (A3))
736 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
737 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
738 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
741 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
742 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
743 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
746 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
747 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
748 unsigned int opinfo = w->opinfo;
750 svtype t = SvTYPE(sv);
759 PUSHs(sv_2mortal(newRV_inc(sv)));
760 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
763 U8 *s = (U8 *) SvPV_const(sv, l);
765 len = utf8_length(s, s + l);
769 } else if (t == SVt_PVAV) {
770 len = av_len((AV *) sv) + 1;
777 XPUSHs(vmg_op_info(opinfo));
780 call_sv(w->cb_len, G_SCALAR);
782 VMG_CB_CALL_SET_RET(len);
787 return t == SVt_PVAV ? ret - 1 : ret;
790 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
791 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
792 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
795 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
797 unsigned int had_err, has_err, flags = G_SCALAR | G_EVAL;
802 /* Don't even bother if we are in global destruction - the wizard is prisoner
803 * of circular references and we are way beyond user realm */
807 w = SV2MGWIZ(mg->mg_ptr);
809 /* So that it survives the temp cleanup below */
812 #if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
813 /* The previous magic tokens were freed but the magic chain wasn't updated, so
814 * if you access the sv from the callback the old deleted magics will trigger
815 * and cause memory misreads. Change 32686 solved it that way : */
824 PUSHs(sv_2mortal(newRV_inc(sv)));
825 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
827 XPUSHs(vmg_op_info(w->opinfo));
830 had_err = SvTRUE(ERRSV);
834 call_sv(w->cb_free, flags);
836 has_err = SvTRUE(ERRSV);
837 if (IN_PERL_COMPILETIME && !had_err && has_err)
840 VMG_CB_CALL_SET_RET(0);
846 /* Get the eval context that was pushed by call_sv, and fake an entry for the
847 * namesv, as die_where will need it to be non NULL later */
848 PERL_CONTEXT *cx = cxstack + cxstack_ix + 1;
849 if (!cx->blk_eval.old_namesv)
850 cx->blk_eval.old_namesv
851 = sv_2mortal(newSVpvn_share("Variable/Magic/DUMMY.pm", 23, 0));
854 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
855 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
858 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
859 * mg->mg_ptr reference count */
864 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
865 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
872 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
875 if (keylen == HEf_SVKEY) {
878 keysv = newSVpvn(key, keylen);
881 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
883 if (keylen != HEf_SVKEY) {
889 #endif /* MGf_COPY */
892 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
898 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
899 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
900 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
902 #endif /* MGf_LOCAL */
905 STATIC OP *vmg_pp_resetuvar(pTHX) {
906 SvRMAGICAL_on(cSVOP_sv);
910 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
913 SV *key = NULL, *newkey = NULL;
916 umg = mg_find(sv, PERL_MAGIC_uvar);
917 /* umg can't be NULL or we wouldn't be there. */
919 uf = (struct ufuncs *) umg->mg_ptr;
921 if (uf[1].uf_val != NULL) { uf[1].uf_val(aTHX_ action, sv); }
922 if (uf[1].uf_set != NULL) { uf[1].uf_set(aTHX_ action, sv); }
924 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
925 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
927 switch (mg->mg_type) {
930 case PERL_MAGIC_tied:
936 if (mg->mg_private != SIG_WIZ) continue;
937 w = SV2MGWIZ(mg->mg_ptr);
943 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
948 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
950 case HV_FETCH_ISSTORE:
951 case HV_FETCH_LVALUE:
952 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
954 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
956 case HV_FETCH_ISEXISTS:
958 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
962 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
967 if (SvRMAGICAL(sv) && !tied) {
968 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
969 * mistaken for a tied hash by the rest of hv_common. It will be reset by
970 * the op_ppaddr of a new fake op injected between the current and the next
973 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
975 NewOp(1101, svop, 1, SVOP);
976 svop->op_type = OP_STUB;
977 svop->op_ppaddr = vmg_pp_resetuvar;
978 svop->op_next = o->op_next;
981 o->op_next = (OP *) svop;
988 #endif /* VMG_UVAR */
990 /* ... Wizard destructor ................................................... */
992 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
996 if (PL_dirty) /* During global destruction, the context is already freed */
1000 #if VMG_MULTIPLICITY
1001 if (w->owner != aTHX)
1004 #endif /* VMG_MULTIPLICITY */
1008 if (hv_delete(MY_CXT.wizards, buf, sprintf(buf, "%u", w->sig), 0) != wiz)
1011 SvFLAGS(wiz) |= SVf_BREAK;
1014 if (w->cb_data != NULL) { SvREFCNT_dec(SvRV(w->cb_data)); }
1015 if (w->cb_get != NULL) { SvREFCNT_dec(SvRV(w->cb_get)); }
1016 if (w->cb_set != NULL) { SvREFCNT_dec(SvRV(w->cb_set)); }
1017 if (w->cb_len != NULL) { SvREFCNT_dec(SvRV(w->cb_len)); }
1018 if (w->cb_clear != NULL) { SvREFCNT_dec(SvRV(w->cb_clear)); }
1019 if (w->cb_free != NULL) { SvREFCNT_dec(SvRV(w->cb_free)); }
1021 if (w->cb_copy != NULL) { SvREFCNT_dec(SvRV(w->cb_copy)); }
1022 #endif /* MGf_COPY */
1024 if (w->cb_dup != NULL) { SvREFCNT_dec(SvRV(w->cb_dup)); }
1025 #endif /* MGf_DUP */
1027 if (w->cb_local != NULL) { SvREFCNT_dec(SvRV(w->cb_local)); }
1028 #endif /* MGf_LOCAL */
1030 if (w->cb_fetch != NULL) { SvREFCNT_dec(SvRV(w->cb_fetch)); }
1031 if (w->cb_store != NULL) { SvREFCNT_dec(SvRV(w->cb_store)); }
1032 if (w->cb_exists != NULL) { SvREFCNT_dec(SvRV(w->cb_exists)); }
1033 if (w->cb_delete != NULL) { SvREFCNT_dec(SvRV(w->cb_delete)); }
1034 #endif /* VMG_UVAR */
1042 STATIC MGVTBL vmg_wizard_vtbl = {
1047 vmg_wizard_free, /* free */
1050 #endif /* MGf_COPY */
1053 #endif /* MGf_DUP */
1056 #endif /* MGf_LOCAL */
1059 STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
1060 #define vmg_sv2sig(S) vmg_sv2sig(aTHX_ (S))
1065 } else if (SvNOK(sv)) {
1067 } else if ((SvPOK(sv) && grok_number(SvPVX(sv), SvCUR(sv), NULL))) {
1070 croak(vmg_invalid_sig);
1073 if (sig < SIG_MIN || sig > SIG_MAX)
1074 croak(vmg_invalid_sig);
1079 STATIC U16 vmg_wizard_sig(pTHX_ SV *wiz) {
1080 #define vmg_wizard_sig(W) vmg_wizard_sig(aTHX_ (W))
1085 sig = SV2MGWIZ(SvRV(wiz))->sig;
1086 } else if (SvOK(wiz)) {
1087 sig = vmg_sv2sig(wiz);
1089 croak(vmg_invalid_wiz);
1094 if (!hv_exists(MY_CXT.wizards, buf, sprintf(buf, "%u", sig)))
1095 croak(vmg_invalid_wiz);
1101 STATIC SV *vmg_wizard_wiz(pTHX_ SV *wiz) {
1102 #define vmg_wizard_wiz(W) vmg_wizard_wiz(aTHX_ (W))
1109 #if VMG_MULTIPLICITY
1110 if (SV2MGWIZ(wiz)->owner == aTHX)
1112 #endif /* VMG_MULTIPLICITY */
1113 sig = SV2MGWIZ(wiz)->sig;
1114 } else if (SvOK(wiz)) {
1115 sig = vmg_sv2sig(wiz);
1117 croak(vmg_invalid_wiz);
1122 return (old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))
1127 #define VMG_SET_CB(S, N) \
1129 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? newRV_inc(SvRV(cb)) : NULL;
1131 #define VMG_SET_SVT_CB(S, N) \
1133 if (SvOK(cb) && SvROK(cb)) { \
1134 t->svt_ ## N = vmg_svt_ ## N; \
1135 w->cb_ ## N = newRV_inc(SvRV(cb)); \
1137 t->svt_ ## N = NULL; \
1138 w->cb_ ## N = NULL; \
1143 #define VMG_CLONE_CB(N) \
1144 z->cb_ ## N = (w->cb_ ## N) ? newRV_inc(vmg_clone(SvRV(w->cb_ ## N), \
1148 STATIC MGWIZ *vmg_wizard_clone(pTHX_ const MGWIZ *w) {
1149 #define vmg_wizard_clone(W) vmg_wizard_clone(aTHX_ (W))
1154 Copy(w->vtbl, t, 1, MGVTBL);
1161 VMG_CLONE_CB(clear);
1165 #endif /* MGf_COPY */
1168 #endif /* MGf_DUP */
1170 VMG_CLONE_CB(local);
1171 #endif /* MGf_LOCAL */
1173 VMG_CLONE_CB(fetch);
1174 VMG_CLONE_CB(store);
1175 VMG_CLONE_CB(exists);
1176 VMG_CLONE_CB(delete);
1177 #endif /* VMG_UVAR */
1182 z->opinfo = w->opinfo;
1187 #endif /* VMG_THREADSAFE */
1189 /* --- XS ------------------------------------------------------------------ */
1191 MODULE = Variable::Magic PACKAGE = Variable::Magic
1199 MY_CXT.wizards = newHV();
1200 hv_iterinit(MY_CXT.wizards); /* Allocate iterator */
1201 MY_CXT.b__op_stashes[0] = NULL;
1202 stash = gv_stashpv(__PACKAGE__, 1);
1203 newCONSTSUB(stash, "SIG_MIN", newSVuv(SIG_MIN));
1204 newCONSTSUB(stash, "SIG_MAX", newSVuv(SIG_MAX));
1205 newCONSTSUB(stash, "SIG_NBR", newSVuv(SIG_NBR));
1206 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1207 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1208 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1209 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1210 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1211 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1212 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1213 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1214 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1215 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1216 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1217 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1218 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1219 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1220 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1221 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1231 U32 had_b__op_stash = 0;
1238 hv_iterinit(hv); /* Allocate iterator */
1239 hv_iterinit(MY_CXT.wizards);
1240 while ((key = hv_iternext(MY_CXT.wizards))) {
1242 char *sig = HePV(key, len);
1246 w = SV2MGWIZ(HeVAL(key));
1247 w = vmg_wizard_clone(w);
1249 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1250 mg->mg_private = SIG_WZO;
1252 if (!hv_store(hv, sig, len, sv, HeHASH(key))) croak("%s during CLONE", vmg_globstorefail);
1254 for (c = 0; c < OPc_MAX; ++c) {
1255 if (MY_CXT.b__op_stashes[c])
1256 had_b__op_stash |= (((U32) 1) << c);
1261 MY_CXT.wizards = hv;
1262 for (c = 0; c < OPc_MAX; ++c) {
1263 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1264 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1268 #endif /* VMG_THREADSAFE */
1288 #endif /* MGf_COPY */
1291 #endif /* MGf_DUP */
1294 #endif /* MGf_LOCAL */
1297 #endif /* VMG_UVAR */
1298 ) { croak(vmg_wrongargnum); }
1303 sig = vmg_sv2sig(svsig);
1304 if ((old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))) {
1305 ST(0) = sv_2mortal(newRV_inc(*old));
1315 VMG_SET_CB(ST(i++), data);
1317 w->opinfo = SvOK(cb) ? SvUV(cb) : 0;
1319 vmg_op_info_init(w->opinfo);
1320 VMG_SET_SVT_CB(ST(i++), get);
1321 VMG_SET_SVT_CB(ST(i++), set);
1322 VMG_SET_SVT_CB(ST(i++), len);
1323 VMG_SET_SVT_CB(ST(i++), clear);
1324 VMG_SET_SVT_CB(ST(i++), free);
1326 VMG_SET_SVT_CB(ST(i++), copy);
1327 #endif /* MGf_COPY */
1329 /* VMG_SET_SVT_CB(ST(i++), dup); */
1333 #endif /* MGf_DUP */
1335 VMG_SET_SVT_CB(ST(i++), local);
1336 #endif /* MGf_LOCAL */
1338 VMG_SET_CB(ST(i++), fetch);
1339 VMG_SET_CB(ST(i++), store);
1340 VMG_SET_CB(ST(i++), exists);
1341 VMG_SET_CB(ST(i++), delete);
1343 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1344 w->uvar = SvTRUE(cb) ? 2 : 1;
1347 #endif /* VMG_UVAR */
1348 #if VMG_MULTIPLICITY
1350 #endif /* VMG_MULTIPLICITY */
1355 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1356 mg->mg_private = SIG_WZO;
1359 if (!hv_store(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), sv, 0)) croak(vmg_globstorefail);
1361 RETVAL = newRV_noinc(sv);
1368 RETVAL = newSVuv(vmg_gensig());
1375 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
1376 RETVAL = newSVuv(SV2MGWIZ(SvRV(wiz))->sig);
1380 SV *cast(SV *sv, SV *wiz, ...)
1381 PROTOTYPE: \[$@%&*]$@
1386 wiz = vmg_wizard_wiz(wiz);
1392 av_fill(args, items - 2);
1393 for (i = 2; i < items; ++i) {
1396 if (av_store(args, i - 2, arg) == NULL) { croak(vmg_argstorefailed); }
1399 ret = newSVuv(vmg_cast(SvRV(sv), wiz, args));
1406 getdata(SV *sv, SV *wiz)
1407 PROTOTYPE: \[$@%&*]$
1412 sig = vmg_wizard_sig(wiz);
1413 data = vmg_data_get(SvRV(sv), sig);
1414 if (!data) { XSRETURN_UNDEF; }
1418 SV *dispell(SV *sv, SV *wiz)
1419 PROTOTYPE: \[$@%&*]$
1423 sig = vmg_wizard_sig(wiz);
1424 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));