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 NewOp(m, var, c, type) Newz(m, var, c, type)
97 # define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
101 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
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 /* --- Context-safe global data -------------------------------------------- */
200 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
202 typedef HV * my_cxt_t;
206 /* --- Signatures ---------------------------------------------------------- */
208 #define SIG_MIN ((U16) (1u << 8))
209 #define SIG_MAX ((U16) ((1u << 16) - 1))
210 #define SIG_NBR (SIG_MAX - SIG_MIN + 1)
211 #define SIG_WIZ ((U16) ((1u << 8) - 1))
213 /* ... Generate signatures ................................................. */
215 STATIC U16 vmg_gensig(pTHX) {
216 #define vmg_gensig() vmg_gensig(aTHX)
222 sig = SIG_NBR * Drand01() + SIG_MIN;
223 } while (hv_exists(MY_CXT, buf, sprintf(buf, "%u", sig)));
228 /* --- MGWIZ structure ----------------------------------------------------- */
238 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
241 #endif /* MGf_COPY */
247 #endif /* MGf_LOCAL */
249 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
250 #endif /* VMG_UVAR */
253 #endif /* VMG_MULTIPLICITY */
256 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
257 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
259 /* ... Construct private data .............................................. */
261 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
262 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
264 I32 i, alen = (args == NULL) ? 0 : av_len(args);
272 EXTEND(SP, alen + 1);
273 PUSHs(sv_2mortal(newRV_inc(sv)));
274 for (i = 0; i < alen; ++i)
275 PUSHs(*av_fetch(args, i, 0));
278 call_sv(ctor, G_SCALAR);
282 #if VMG_HAS_PERL(5, 8, 3)
283 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
285 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
295 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
296 MAGIC *mg, *moremagic;
298 if (SvTYPE(sv) >= SVt_PVMG) {
299 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
300 moremagic = mg->mg_moremagic;
301 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == sig)) { break; }
303 if (mg) { return mg->mg_obj; }
309 /* ... Magic cast/dispell .................................................. */
312 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
314 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
316 prevmagic->mg_moremagic = moremagic;
318 SvMAGIC_set(sv, moremagic);
320 mg->mg_moremagic = NULL;
321 Safefree(mg->mg_ptr);
324 #endif /* VMG_UVAR */
326 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz, AV *args) {
327 #define vmg_cast(S, W, A) vmg_cast(aTHX_ (S), (W), (A))
328 MAGIC *mg = NULL, *moremagic = NULL;
331 U32 oldgmg = SvGMAGICAL(sv);
335 if (SvTYPE(sv) >= SVt_PVMG) {
336 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
337 moremagic = mg->mg_moremagic;
338 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == w->sig)) { break; }
340 if (mg) { return 1; }
343 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
344 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
345 mg->mg_private = w->sig;
348 mg->mg_flags |= MGf_COPY;
349 #endif /* MGf_COPY */
352 mg->mg_flags |= MGf_DUP;
356 mg->mg_flags |= MGf_LOCAL;
357 #endif /* MGf_LOCAL */
359 if (SvTYPE(sv) < SVt_PVHV)
362 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
363 * magic is actually never called for them. If the GMAGICAL flag was off before
364 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
365 * now on, then this wizard has get magic. Hence we can work around the
366 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
367 * has uvar callbacks, it will be turned back on later. */
368 if (!oldgmg && SvGMAGICAL(sv))
376 uf[0].uf_val = vmg_svt_val;
383 /* One uvar magic in the chain is enough. */
384 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
385 moremagic = mg->mg_moremagic;
386 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
389 if (mg) { /* Found another uvar magic. */
390 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
391 if (olduf->uf_val == vmg_svt_val) {
392 /* It's our uvar magic, nothing to do. oldgmg was true. */
395 /* It's another uvar magic, backup it and replace it by ours. */
397 vmg_uvar_del(sv, prevmagic, mg, moremagic);
401 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
402 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
403 * handled by our uvar callback. */
405 #endif /* VMG_UVAR */
411 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
412 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
415 #endif /* VMG_UVAR */
416 MAGIC *mg, *prevmagic, *moremagic = NULL;
418 if (SvTYPE(sv) < SVt_PVMG) { return 0; }
420 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
421 moremagic = mg->mg_moremagic;
422 if (mg->mg_type == PERL_MAGIC_ext) {
423 if (mg->mg_private == sig) {
425 /* If the current has no uvar, short-circuit uvar deletion. */
426 uvars = (SV2MGWIZ(mg->mg_ptr)->uvar) ? (uvars + 1) : 0;
427 #endif /* VMG_UVAR */
430 } else if ((mg->mg_private >= SIG_MIN) &&
431 (mg->mg_private <= SIG_MAX) &&
432 SV2MGWIZ(mg->mg_ptr)->uvar) {
434 /* We can't break here since we need to find the ext magic to delete. */
435 #endif /* VMG_UVAR */
439 if (!mg) { return 0; }
442 prevmagic->mg_moremagic = moremagic;
444 SvMAGIC_set(sv, moremagic);
446 mg->mg_moremagic = NULL;
448 if (mg->mg_obj != sv) { SvREFCNT_dec(mg->mg_obj); } /* Destroy private data */
449 SvREFCNT_dec((SV *) mg->mg_ptr); /* Unreference the wizard */
453 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
454 /* mg was the first ext magic in the chain that had uvar */
456 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
457 if ((mg->mg_type == PERL_MAGIC_ext) &&
458 (mg->mg_private >= SIG_MIN) &&
459 (mg->mg_private <= SIG_MAX) &&
460 SV2MGWIZ(mg->mg_ptr)->uvar) {
468 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
469 moremagic = mg->mg_moremagic;
470 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
473 uf = (struct ufuncs *) mg->mg_ptr;
474 /* assert(uf->uf_val == vmg_svt_val); */
475 if (uf[1].uf_val || uf[1].uf_set) {
476 /* Revert the original uvar magic. */
478 Renew(uf, 1, struct ufuncs);
479 mg->mg_ptr = (char *) uf;
480 mg->mg_len = sizeof(struct ufuncs);
482 /* Remove the uvar magic. */
483 vmg_uvar_del(sv, prevmagic, mg, moremagic);
487 #endif /* VMG_UVAR */
492 /* ... OP info ............................................................. */
494 #define VMG_OP_INFO_NAME 1
495 #define VMG_OP_INFO_OBJECT 2
497 STATIC STRLEN *vmg_op_name_len = NULL;
499 STATIC HV *vmg_b__op_stash = NULL;
501 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
502 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
504 case VMG_OP_INFO_NAME:
505 if (!vmg_op_name_len) {
507 Newx(vmg_op_name_len, MAXO, STRLEN);
508 for (t = 0; t < OP_max; ++t)
509 vmg_op_name_len[t] = strlen(PL_op_name[t]);
512 case VMG_OP_INFO_OBJECT:
513 if (!vmg_b__op_stash) {
515 vmg_b__op_stash = gv_stashpv("B::OP", 1);
523 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
524 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
529 case VMG_OP_INFO_NAME: {
530 OPCODE t = PL_op->op_type;
531 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
533 case VMG_OP_INFO_OBJECT:
534 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
543 /* ... svt callbacks ....................................................... */
545 #define VMG_CB_CALL_ARGS_MASK 15
546 #define VMG_CB_CALL_ARGS_SHIFT 4
547 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
548 #define VMG_CB_CALL_EVAL 4
550 STATIC int vmg_cb_call(pTHX_ SV *cb, SV *sv, SV *data, unsigned int flags, ...){
554 unsigned int i, args, opinfo, eval;
558 args = flags & VMG_CB_CALL_ARGS_MASK;
559 flags >>= VMG_CB_CALL_ARGS_SHIFT;
560 opinfo = flags & VMG_CB_CALL_OPINFO;
561 eval = flags & VMG_CB_CALL_EVAL ? G_EVAL : 0;
567 EXTEND(SP, args + 2);
568 PUSHs(sv_2mortal(newRV_inc(sv)));
569 PUSHs(data ? data : &PL_sv_undef);
571 for (i = 0; i < args; ++i) {
572 SV *sva = va_arg(ap, SV *);
573 PUSHs(sva ? sva : &PL_sv_undef);
577 XPUSHs(vmg_op_info(opinfo));
580 call_sv(cb, G_SCALAR | eval);
583 if (eval && IN_PERL_COMPILETIME && SvTRUE(ERRSV))
586 ret = SvOK(svr) ? SvIV(svr) : 0;
595 #define vmg_cb_call1(I, S, D) \
596 vmg_cb_call(aTHX_ (I), (S), (D), (flags << VMG_CB_CALL_ARGS_SHIFT))
597 #define vmg_cb_call2(I, S, D, S2) \
598 vmg_cb_call(aTHX_ (I), (S), (D), ((flags << VMG_CB_CALL_ARGS_SHIFT) | 1), (S2))
599 #define vmg_cb_call3(I, S, D, S2, S3) \
600 vmg_cb_call(aTHX_ (I), (S), (D), ((flags << VMG_CB_CALL_ARGS_SHIFT) | 2), (S2), (S3))
602 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
603 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
604 unsigned int flags = w->opinfo;
605 return vmg_cb_call1(w->cb_get, sv, mg->mg_obj);
608 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
609 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
610 unsigned int flags = w->opinfo;
611 return vmg_cb_call1(w->cb_set, sv, mg->mg_obj);
614 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
616 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
617 unsigned int opinfo = w->opinfo;
619 svtype t = SvTYPE(sv);
628 PUSHs(sv_2mortal(newRV_inc(sv)));
629 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
632 U8 *s = (U8 *) SvPV_const(sv, l);
634 len = utf8_length(s, s + l);
638 } else if (t == SVt_PVAV) {
639 len = av_len((AV *) sv) + 1;
646 XPUSHs(vmg_op_info(opinfo));
649 call_sv(w->cb_len, G_SCALAR);
653 ret = SvOK(svr) ? SvUV(svr) : len;
659 return t == SVt_PVAV ? ret - 1 : ret;
662 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
663 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
664 unsigned int flags = w->opinfo;
665 return vmg_cb_call1(w->cb_clear, sv, mg->mg_obj);
668 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
669 SV *wiz = (SV *) mg->mg_ptr;
674 /* This may happen in global destruction */
675 if (SvTYPE(wiz) == SVTYPEMASK)
678 w = SV2MGWIZ(mg->mg_ptr);
679 flags = w->opinfo | VMG_CB_CALL_EVAL;
681 /* So that it survives the temp cleanup in vmg_cb_call */
684 #if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
685 /* The previous magic tokens were freed but the magic chain wasn't updated, so
686 * if you access the sv from the callback the old deleted magics will trigger
687 * and cause memory misreads. Change 32686 solved it that way : */
691 ret = vmg_cb_call1(w->cb_free, sv, mg->mg_obj);
693 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
694 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
697 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
698 * mg->mg_ptr reference count */
703 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
704 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
711 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
712 unsigned int flags = w->opinfo;
715 if (keylen == HEf_SVKEY) {
718 keysv = newSVpvn(key, keylen);
721 ret = vmg_cb_call3(w->cb_copy, sv, mg->mg_obj, keysv, nsv);
723 if (keylen != HEf_SVKEY) {
729 #endif /* MGf_COPY */
732 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
738 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
739 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
740 unsigned int flags = w->opinfo;
741 return vmg_cb_call1(w->cb_local, nsv, mg->mg_obj);
743 #endif /* MGf_LOCAL */
746 STATIC OP *vmg_pp_resetuvar(pTHX) {
747 SvRMAGICAL_on(cSVOP_sv);
751 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
754 SV *key = NULL, *newkey = NULL;
757 umg = mg_find(sv, PERL_MAGIC_uvar);
758 /* umg can't be NULL or we wouldn't be there. */
760 uf = (struct ufuncs *) umg->mg_ptr;
762 if (uf[1].uf_val != NULL) { uf[1].uf_val(aTHX_ action, sv); }
763 if (uf[1].uf_set != NULL) { uf[1].uf_set(aTHX_ action, sv); }
765 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
766 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
769 switch (mg->mg_type) {
772 case PERL_MAGIC_tied:
778 if (mg->mg_private < SIG_MIN || mg->mg_private > SIG_MAX)
780 w = SV2MGWIZ(mg->mg_ptr);
787 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
791 if (w->cb_fetch) { vmg_cb_call2(w->cb_fetch, sv, mg->mg_obj, key); }
793 case HV_FETCH_ISSTORE:
794 case HV_FETCH_LVALUE:
795 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
796 if (w->cb_store) { vmg_cb_call2(w->cb_store, sv, mg->mg_obj, key); }
798 case HV_FETCH_ISEXISTS:
799 if (w->cb_exists) { vmg_cb_call2(w->cb_exists, sv, mg->mg_obj, key); }
802 if (w->cb_delete) { vmg_cb_call2(w->cb_delete, sv, mg->mg_obj, key); }
807 if (SvRMAGICAL(sv) && !tied) {
808 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
809 * mistaken for a tied hash by the rest of hv_common. It will be reset by
810 * the op_ppaddr of a new fake op injected between the current and the next
813 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
815 NewOp(1101, svop, 1, SVOP);
816 svop->op_type = OP_STUB;
817 svop->op_ppaddr = vmg_pp_resetuvar;
818 svop->op_next = o->op_next;
821 o->op_next = (OP *) svop;
828 #endif /* VMG_UVAR */
830 /* ... Wizard destructor ................................................... */
832 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
836 if (PL_dirty) /* During global destruction, the context is already freed */
841 if (w->owner != aTHX)
844 #endif /* VMG_MULTIPLICITY */
848 if (hv_delete(MY_CXT, buf, sprintf(buf, "%u", w->sig), 0) != wiz)
851 SvFLAGS(wiz) |= SVf_BREAK;
854 if (w->cb_data != NULL) { SvREFCNT_dec(SvRV(w->cb_data)); }
855 if (w->cb_get != NULL) { SvREFCNT_dec(SvRV(w->cb_get)); }
856 if (w->cb_set != NULL) { SvREFCNT_dec(SvRV(w->cb_set)); }
857 if (w->cb_len != NULL) { SvREFCNT_dec(SvRV(w->cb_len)); }
858 if (w->cb_clear != NULL) { SvREFCNT_dec(SvRV(w->cb_clear)); }
859 if (w->cb_free != NULL) { SvREFCNT_dec(SvRV(w->cb_free)); }
861 if (w->cb_copy != NULL) { SvREFCNT_dec(SvRV(w->cb_copy)); }
862 #endif /* MGf_COPY */
864 if (w->cb_dup != NULL) { SvREFCNT_dec(SvRV(w->cb_dup)); }
867 if (w->cb_local != NULL) { SvREFCNT_dec(SvRV(w->cb_local)); }
868 #endif /* MGf_LOCAL */
870 if (w->cb_fetch != NULL) { SvREFCNT_dec(SvRV(w->cb_fetch)); }
871 if (w->cb_store != NULL) { SvREFCNT_dec(SvRV(w->cb_store)); }
872 if (w->cb_exists != NULL) { SvREFCNT_dec(SvRV(w->cb_exists)); }
873 if (w->cb_delete != NULL) { SvREFCNT_dec(SvRV(w->cb_delete)); }
874 #endif /* VMG_UVAR */
882 STATIC MGVTBL vmg_wizard_vtbl = {
887 vmg_wizard_free, /* free */
890 #endif /* MGf_COPY */
896 #endif /* MGf_LOCAL */
899 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
900 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
901 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
902 STATIC const char vmg_toomanysigs[] = "Too many magic signatures used";
903 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
905 STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
906 #define vmg_sv2sig(S) vmg_sv2sig(aTHX_ (S))
911 } else if (SvNOK(sv)) {
913 } else if ((SvPOK(sv) && grok_number(SvPVX(sv), SvCUR(sv), NULL))) {
916 croak(vmg_invalid_sig);
918 if (sig < SIG_MIN) { sig += SIG_MIN; }
919 if (sig > SIG_MAX) { sig %= SIG_MAX + 1; }
924 STATIC U16 vmg_wizard_sig(pTHX_ SV *wiz) {
925 #define vmg_wizard_sig(W) vmg_wizard_sig(aTHX_ (W))
930 sig = SV2MGWIZ(SvRV(wiz))->sig;
931 } else if (SvOK(wiz)) {
932 sig = vmg_sv2sig(wiz);
934 croak(vmg_invalid_wiz);
939 if (!hv_fetch(MY_CXT, buf, sprintf(buf, "%u", sig), 0))
945 STATIC SV *vmg_wizard_wiz(pTHX_ SV *wiz) {
946 #define vmg_wizard_wiz(W) vmg_wizard_wiz(aTHX_ (W))
954 if (SV2MGWIZ(wiz)->owner == aTHX)
956 #endif /* VMG_MULTIPLICITY */
957 sig = SV2MGWIZ(wiz)->sig;
958 } else if (SvOK(wiz)) {
959 sig = vmg_sv2sig(wiz);
961 croak(vmg_invalid_wiz);
966 return (old = hv_fetch(MY_CXT, buf, sprintf(buf, "%u", sig), 0))
971 #define VMG_SET_CB(S, N) \
973 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? newRV_inc(SvRV(cb)) : NULL;
975 #define VMG_SET_SVT_CB(S, N) \
977 if (SvOK(cb) && SvROK(cb)) { \
978 t->svt_ ## N = vmg_svt_ ## N; \
979 w->cb_ ## N = newRV_inc(SvRV(cb)); \
981 t->svt_ ## N = NULL; \
982 w->cb_ ## N = NULL; \
987 #define VMG_CLONE_CB(N) \
988 z->cb_ ## N = (w->cb_ ## N) ? newRV_inc(vmg_clone(SvRV(w->cb_ ## N), \
992 STATIC MGWIZ *vmg_wizard_clone(pTHX_ const MGWIZ *w) {
993 #define vmg_wizard_clone(W) vmg_wizard_clone(aTHX_ (W))
998 Copy(w->vtbl, t, 1, MGVTBL);
1005 VMG_CLONE_CB(clear);
1009 #endif /* MGf_COPY */
1012 #endif /* MGf_DUP */
1014 VMG_CLONE_CB(local);
1015 #endif /* MGf_LOCAL */
1017 VMG_CLONE_CB(fetch);
1018 VMG_CLONE_CB(store);
1019 VMG_CLONE_CB(exists);
1020 VMG_CLONE_CB(delete);
1021 #endif /* VMG_UVAR */
1026 z->opinfo = w->opinfo;
1031 #endif /* VMG_THREADSAFE */
1033 /* --- XS ------------------------------------------------------------------ */
1035 MODULE = Variable::Magic PACKAGE = Variable::Magic
1044 hv_iterinit(MY_CXT); /* Allocate iterator */
1045 stash = gv_stashpv(__PACKAGE__, 1);
1046 newCONSTSUB(stash, "SIG_MIN", newSVuv(SIG_MIN));
1047 newCONSTSUB(stash, "SIG_MAX", newSVuv(SIG_MAX));
1048 newCONSTSUB(stash, "SIG_NBR", newSVuv(SIG_NBR));
1049 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1050 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1051 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1052 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1053 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1054 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1055 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1056 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1057 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1058 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1059 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1060 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1061 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1062 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1063 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1064 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1079 hv_iterinit(hv); /* Allocate iterator */
1080 hv_iterinit(MY_CXT);
1081 while ((key = hv_iternext(MY_CXT))) {
1083 char *sig = HePV(key, len);
1086 sv = MGWIZ2SV(vmg_wizard_clone(SV2MGWIZ(HeVAL(key))));
1087 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1088 mg->mg_private = SIG_WIZ;
1090 hv_store(hv, sig, len, sv, HeHASH(key));
1098 #endif /* VMG_THREADSAFE */
1118 #endif /* MGf_COPY */
1121 #endif /* MGf_DUP */
1124 #endif /* MGf_LOCAL */
1127 #endif /* VMG_UVAR */
1128 ) { croak(vmg_wrongargnum); }
1133 sig = vmg_sv2sig(svsig);
1134 if ((old = hv_fetch(MY_CXT, buf, sprintf(buf, "%u", sig), 0))) {
1135 ST(0) = sv_2mortal(newRV_inc(*old));
1139 if (HvKEYS(MY_CXT) >= SIG_NBR) { croak(vmg_toomanysigs); }
1146 VMG_SET_CB(ST(i++), data);
1148 w->opinfo = SvOK(cb) ? SvUV(cb) : 0;
1150 vmg_op_info_init(w->opinfo);
1151 VMG_SET_SVT_CB(ST(i++), get);
1152 VMG_SET_SVT_CB(ST(i++), set);
1153 VMG_SET_SVT_CB(ST(i++), len);
1154 VMG_SET_SVT_CB(ST(i++), clear);
1155 VMG_SET_SVT_CB(ST(i++), free);
1157 VMG_SET_SVT_CB(ST(i++), copy);
1158 #endif /* MGf_COPY */
1160 /* VMG_SET_SVT_CB(ST(i++), dup); */
1164 #endif /* MGf_DUP */
1166 VMG_SET_SVT_CB(ST(i++), local);
1167 #endif /* MGf_LOCAL */
1169 VMG_SET_CB(ST(i++), fetch);
1170 VMG_SET_CB(ST(i++), store);
1171 VMG_SET_CB(ST(i++), exists);
1172 VMG_SET_CB(ST(i++), delete);
1174 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1175 w->uvar = SvTRUE(cb) ? 2 : 1;
1178 #endif /* VMG_UVAR */
1179 #if VMG_MULTIPLICITY
1181 #endif /* VMG_MULTIPLICITY */
1186 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1187 mg->mg_private = SIG_WIZ;
1190 hv_store(MY_CXT, buf, sprintf(buf, "%u", sig), sv, 0);
1192 RETVAL = newRV_noinc(sv);
1200 if (HvKEYS(MY_CXT) >= SIG_NBR) { croak(vmg_toomanysigs); }
1201 RETVAL = newSVuv(vmg_gensig());
1208 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
1209 RETVAL = newSVuv(SV2MGWIZ(SvRV(wiz))->sig);
1213 SV *cast(SV *sv, SV *wiz, ...)
1214 PROTOTYPE: \[$@%&*]$@
1219 wiz = vmg_wizard_wiz(wiz);
1225 av_fill(args, items - 2);
1226 for (i = 2; i < items; ++i) {
1229 if (av_store(args, i - 2, arg) == NULL) { croak(vmg_argstorefailed); }
1232 ret = newSVuv(vmg_cast(SvRV(sv), wiz, args));
1238 SV *getdata(SV *sv, SV *wiz)
1239 PROTOTYPE: \[$@%&*]$
1244 sig = vmg_wizard_sig(wiz);
1247 data = vmg_data_get(SvRV(sv), sig);
1248 if (!data) { XSRETURN_UNDEF; }
1252 SV *dispell(SV *sv, SV *wiz)
1253 PROTOTYPE: \[$@%&*]$
1257 sig = vmg_wizard_sig(wiz);
1260 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));
1268 if (vmg_op_name_len) {
1269 Safefree(vmg_op_name_len);
1270 vmg_op_name_len = NULL;