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)))
105 # define SvPV_const SvPV
108 #ifndef PERL_MAGIC_ext
109 # define PERL_MAGIC_ext '~'
112 #ifndef PERL_MAGIC_tied
113 # define PERL_MAGIC_tied 'P'
128 #ifndef IN_PERL_COMPILETIME
129 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
132 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
133 # ifndef PL_error_count
134 # define PL_error_count PL_parser->error_count
137 # ifndef PL_error_count
138 # define PL_error_count PL_Ierror_count
142 /* uvar magic and Hash::Util::FieldHash were commited with 28419 */
143 #if VMG_HAS_PERL_MAINT(5, 9, 4, 28419) || VMG_HAS_PERL(5, 10, 0)
149 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160 */
150 #ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
151 # if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
152 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
154 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
158 /* Applied to dev-5.11 as 34908 */
159 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908)
160 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
162 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
165 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
166 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
167 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
169 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
172 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969)
173 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
175 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
180 /* Bug-free mg_magical - see http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html - but specialized to our needs. */
181 STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
182 #define vmg_sv_magicuvar(S, U, L) vmg_sv_magicuvar(aTHX_ (S), (U), (L))
184 sv_magic(sv, NULL, PERL_MAGIC_uvar, uf, len);
185 /* uvar magic has set and get magic, hence this has set SVs_GMG and SVs_SMG. */
186 if ((mg = SvMAGIC(sv))) {
189 const MGVTBL* const vtbl = mg->mg_virtual;
191 if (vtbl->svt_clear) {
196 } while ((mg = mg->mg_moremagic));
200 #endif /* VMG_UVAR */
202 /* --- Stolen chunk of B --------------------------------------------------- */
220 STATIC const char *const vmg_opclassnames[] = {
235 STATIC opclass vmg_opclass(const OP *o) {
240 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
242 if (o->op_type == OP_SASSIGN)
243 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
245 if (o->op_type == OP_AELEMFAST) {
246 if (o->op_flags & OPf_SPECIAL)
257 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
261 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
278 case OA_PVOP_OR_SVOP:
279 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
284 case OA_BASEOP_OR_UNOP:
285 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
287 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
289 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
291 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
294 if (o->op_flags & OPf_STACKED)
296 else if (o->op_flags & OPf_SPECIAL)
305 /* --- Context-safe global data -------------------------------------------- */
307 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
311 HV *b__op_stashes[OPc_MAX];
316 /* --- Signatures ---------------------------------------------------------- */
318 #define SIG_MIN ((U16) (1u << 8))
319 #define SIG_MAX ((U16) ((1u << 16) - 1))
320 #define SIG_NBR (SIG_MAX - SIG_MIN + 1)
321 #define SIG_WIZ ((U16) ((1u << 8) - 1))
323 /* ... Generate signatures ................................................. */
325 STATIC U16 vmg_gensig(pTHX) {
326 #define vmg_gensig() vmg_gensig(aTHX)
332 sig = SIG_NBR * Drand01() + SIG_MIN;
333 } while (hv_exists(MY_CXT.wizards, buf, sprintf(buf, "%u", sig)));
338 /* --- MGWIZ structure ----------------------------------------------------- */
348 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
351 #endif /* MGf_COPY */
357 #endif /* MGf_LOCAL */
359 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
360 #endif /* VMG_UVAR */
363 #endif /* VMG_MULTIPLICITY */
366 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
367 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
369 /* ... Construct private data .............................................. */
371 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
372 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
374 I32 i, alen = (args == NULL) ? 0 : av_len(args);
382 EXTEND(SP, alen + 1);
383 PUSHs(sv_2mortal(newRV_inc(sv)));
384 for (i = 0; i < alen; ++i)
385 PUSHs(*av_fetch(args, i, 0));
388 call_sv(ctor, G_SCALAR);
392 #if VMG_HAS_PERL(5, 8, 3)
393 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
395 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
405 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
406 MAGIC *mg, *moremagic;
408 if (SvTYPE(sv) >= SVt_PVMG) {
409 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
410 moremagic = mg->mg_moremagic;
411 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == sig)) { break; }
413 if (mg) { return mg->mg_obj; }
419 /* ... Magic cast/dispell .................................................. */
422 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
424 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
426 prevmagic->mg_moremagic = moremagic;
428 SvMAGIC_set(sv, moremagic);
430 mg->mg_moremagic = NULL;
431 Safefree(mg->mg_ptr);
434 #endif /* VMG_UVAR */
436 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz, AV *args) {
437 #define vmg_cast(S, W, A) vmg_cast(aTHX_ (S), (W), (A))
438 MAGIC *mg = NULL, *moremagic = NULL;
441 U32 oldgmg = SvGMAGICAL(sv);
445 if (SvTYPE(sv) >= SVt_PVMG) {
446 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
447 moremagic = mg->mg_moremagic;
448 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == w->sig)) { break; }
450 if (mg) { return 1; }
453 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
454 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
455 mg->mg_private = w->sig;
458 mg->mg_flags |= MGf_COPY;
459 #endif /* MGf_COPY */
462 mg->mg_flags |= MGf_DUP;
466 mg->mg_flags |= MGf_LOCAL;
467 #endif /* MGf_LOCAL */
469 if (SvTYPE(sv) < SVt_PVHV)
472 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
473 * magic is actually never called for them. If the GMAGICAL flag was off before
474 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
475 * now on, then this wizard has get magic. Hence we can work around the
476 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
477 * has uvar callbacks, it will be turned back on later. */
478 if (!oldgmg && SvGMAGICAL(sv))
486 uf[0].uf_val = vmg_svt_val;
493 /* One uvar magic in the chain is enough. */
494 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
495 moremagic = mg->mg_moremagic;
496 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
499 if (mg) { /* Found another uvar magic. */
500 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
501 if (olduf->uf_val == vmg_svt_val) {
502 /* It's our uvar magic, nothing to do. oldgmg was true. */
505 /* It's another uvar magic, backup it and replace it by ours. */
507 vmg_uvar_del(sv, prevmagic, mg, moremagic);
511 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
512 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
513 * handled by our uvar callback. */
515 #endif /* VMG_UVAR */
521 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
522 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
525 #endif /* VMG_UVAR */
526 MAGIC *mg, *prevmagic, *moremagic = NULL;
528 if (SvTYPE(sv) < SVt_PVMG) { return 0; }
530 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
531 moremagic = mg->mg_moremagic;
532 if (mg->mg_type == PERL_MAGIC_ext) {
533 if (mg->mg_private == sig) {
535 /* If the current has no uvar, short-circuit uvar deletion. */
536 uvars = (SV2MGWIZ(mg->mg_ptr)->uvar) ? (uvars + 1) : 0;
537 #endif /* VMG_UVAR */
540 } else if ((mg->mg_private >= SIG_MIN) &&
541 (mg->mg_private <= SIG_MAX) &&
542 SV2MGWIZ(mg->mg_ptr)->uvar) {
544 /* We can't break here since we need to find the ext magic to delete. */
545 #endif /* VMG_UVAR */
549 if (!mg) { return 0; }
552 prevmagic->mg_moremagic = moremagic;
554 SvMAGIC_set(sv, moremagic);
556 mg->mg_moremagic = NULL;
558 if (mg->mg_obj != sv) { SvREFCNT_dec(mg->mg_obj); } /* Destroy private data */
559 SvREFCNT_dec((SV *) mg->mg_ptr); /* Unreference the wizard */
563 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
564 /* mg was the first ext magic in the chain that had uvar */
566 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
567 if ((mg->mg_type == PERL_MAGIC_ext) &&
568 (mg->mg_private >= SIG_MIN) &&
569 (mg->mg_private <= SIG_MAX) &&
570 SV2MGWIZ(mg->mg_ptr)->uvar) {
578 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
579 moremagic = mg->mg_moremagic;
580 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
583 uf = (struct ufuncs *) mg->mg_ptr;
584 /* assert(uf->uf_val == vmg_svt_val); */
585 if (uf[1].uf_val || uf[1].uf_set) {
586 /* Revert the original uvar magic. */
588 Renew(uf, 1, struct ufuncs);
589 mg->mg_ptr = (char *) uf;
590 mg->mg_len = sizeof(struct ufuncs);
592 /* Remove the uvar magic. */
593 vmg_uvar_del(sv, prevmagic, mg, moremagic);
597 #endif /* VMG_UVAR */
602 /* ... OP info ............................................................. */
604 #define VMG_OP_INFO_NAME 1
605 #define VMG_OP_INFO_OBJECT 2
607 STATIC U32 vmg_op_name_init = 0;
608 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
610 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
611 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
613 case VMG_OP_INFO_NAME:
614 if (!vmg_op_name_init) {
616 for (t = 0; t < OP_max; ++t)
617 vmg_op_name_len[t] = strlen(PL_op_name[t]);
618 vmg_op_name_init = 1;
621 case VMG_OP_INFO_OBJECT: {
623 if (!MY_CXT.b__op_stashes[0]) {
626 for (c = 0; c < OPc_MAX; ++c)
627 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
636 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
637 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
642 case VMG_OP_INFO_NAME: {
643 OPCODE t = PL_op->op_type;
644 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
646 case VMG_OP_INFO_OBJECT: {
648 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
649 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
658 /* ... svt callbacks ....................................................... */
660 #define VMG_CB_CALL_SET_RET(D) \
665 ret = SvOK(svr) ? SvIV(svr) : (D); \
669 #define VMG_CB_CALL_ARGS_MASK 15
670 #define VMG_CB_CALL_ARGS_SHIFT 4
671 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
673 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
676 unsigned int i, args, opinfo;
680 args = flags & VMG_CB_CALL_ARGS_MASK;
681 flags >>= VMG_CB_CALL_ARGS_SHIFT;
682 opinfo = flags & VMG_CB_CALL_OPINFO;
688 EXTEND(SP, args + 1);
689 PUSHs(sv_2mortal(newRV_inc(sv)));
691 for (i = 0; i < args; ++i) {
692 SV *sva = va_arg(ap, SV *);
693 PUSHs(sva ? sva : &PL_sv_undef);
697 XPUSHs(vmg_op_info(opinfo));
700 call_sv(cb, G_SCALAR);
702 VMG_CB_CALL_SET_RET(0);
710 #define vmg_cb_call1(I, F, S, A1) \
711 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 1), (S), (A1))
712 #define vmg_cb_call2(I, F, S, A1, A2) \
713 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 2), (S), (A1), (A2))
714 #define vmg_cb_call3(I, F, S, A1, A2, A3) \
715 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 3), (S), (A1), (A2), (A3))
717 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
718 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
719 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
722 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
723 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
724 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
727 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
728 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
729 unsigned int opinfo = w->opinfo;
731 svtype t = SvTYPE(sv);
740 PUSHs(sv_2mortal(newRV_inc(sv)));
741 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
744 U8 *s = (U8 *) SvPV_const(sv, l);
746 len = utf8_length(s, s + l);
750 } else if (t == SVt_PVAV) {
751 len = av_len((AV *) sv) + 1;
758 XPUSHs(vmg_op_info(opinfo));
761 call_sv(w->cb_len, G_SCALAR);
763 VMG_CB_CALL_SET_RET(len);
768 return t == SVt_PVAV ? ret - 1 : ret;
771 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
772 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
773 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
776 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
778 unsigned int had_err, has_err, flags = G_SCALAR | G_EVAL;
783 /* Don't even bother if we are in global destruction - the wizard is prisoner
784 * of circular references and we are way beyond user realm */
788 w = SV2MGWIZ(mg->mg_ptr);
790 /* So that it survives the temp cleanup below */
793 #if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
794 /* The previous magic tokens were freed but the magic chain wasn't updated, so
795 * if you access the sv from the callback the old deleted magics will trigger
796 * and cause memory misreads. Change 32686 solved it that way : */
805 PUSHs(sv_2mortal(newRV_inc(sv)));
806 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
808 XPUSHs(vmg_op_info(w->opinfo));
811 had_err = SvTRUE(ERRSV);
815 call_sv(w->cb_free, flags);
817 has_err = SvTRUE(ERRSV);
818 if (IN_PERL_COMPILETIME && !had_err && has_err)
821 VMG_CB_CALL_SET_RET(0);
827 /* Get the eval context that was pushed by call_sv, and fake an entry for the
828 * namesv, as die_where will need it to be non NULL later */
829 PERL_CONTEXT *cx = cxstack + cxstack_ix + 1;
830 if (!cx->blk_eval.old_namesv)
831 cx->blk_eval.old_namesv
832 = sv_2mortal(newSVpvn_share("Variable/Magic/DUMMY.pm", 23, 0));
835 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
836 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
839 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
840 * mg->mg_ptr reference count */
845 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
846 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
853 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
856 if (keylen == HEf_SVKEY) {
859 keysv = newSVpvn(key, keylen);
862 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
864 if (keylen != HEf_SVKEY) {
870 #endif /* MGf_COPY */
873 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
879 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
880 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
881 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
883 #endif /* MGf_LOCAL */
886 STATIC OP *vmg_pp_resetuvar(pTHX) {
887 SvRMAGICAL_on(cSVOP_sv);
891 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
894 SV *key = NULL, *newkey = NULL;
897 umg = mg_find(sv, PERL_MAGIC_uvar);
898 /* umg can't be NULL or we wouldn't be there. */
900 uf = (struct ufuncs *) umg->mg_ptr;
902 if (uf[1].uf_val != NULL) { uf[1].uf_val(aTHX_ action, sv); }
903 if (uf[1].uf_set != NULL) { uf[1].uf_set(aTHX_ action, sv); }
905 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
906 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
908 switch (mg->mg_type) {
911 case PERL_MAGIC_tied:
917 if (mg->mg_private < SIG_MIN || mg->mg_private > SIG_MAX) continue;
918 w = SV2MGWIZ(mg->mg_ptr);
924 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
929 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
931 case HV_FETCH_ISSTORE:
932 case HV_FETCH_LVALUE:
933 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
935 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
937 case HV_FETCH_ISEXISTS:
939 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
943 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
948 if (SvRMAGICAL(sv) && !tied) {
949 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
950 * mistaken for a tied hash by the rest of hv_common. It will be reset by
951 * the op_ppaddr of a new fake op injected between the current and the next
954 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
956 NewOp(1101, svop, 1, SVOP);
957 svop->op_type = OP_STUB;
958 svop->op_ppaddr = vmg_pp_resetuvar;
959 svop->op_next = o->op_next;
962 o->op_next = (OP *) svop;
969 #endif /* VMG_UVAR */
971 /* ... Wizard destructor ................................................... */
973 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
977 if (PL_dirty) /* During global destruction, the context is already freed */
982 if (w->owner != aTHX)
985 #endif /* VMG_MULTIPLICITY */
989 if (hv_delete(MY_CXT.wizards, buf, sprintf(buf, "%u", w->sig), 0) != wiz)
992 SvFLAGS(wiz) |= SVf_BREAK;
995 if (w->cb_data != NULL) { SvREFCNT_dec(SvRV(w->cb_data)); }
996 if (w->cb_get != NULL) { SvREFCNT_dec(SvRV(w->cb_get)); }
997 if (w->cb_set != NULL) { SvREFCNT_dec(SvRV(w->cb_set)); }
998 if (w->cb_len != NULL) { SvREFCNT_dec(SvRV(w->cb_len)); }
999 if (w->cb_clear != NULL) { SvREFCNT_dec(SvRV(w->cb_clear)); }
1000 if (w->cb_free != NULL) { SvREFCNT_dec(SvRV(w->cb_free)); }
1002 if (w->cb_copy != NULL) { SvREFCNT_dec(SvRV(w->cb_copy)); }
1003 #endif /* MGf_COPY */
1005 if (w->cb_dup != NULL) { SvREFCNT_dec(SvRV(w->cb_dup)); }
1006 #endif /* MGf_DUP */
1008 if (w->cb_local != NULL) { SvREFCNT_dec(SvRV(w->cb_local)); }
1009 #endif /* MGf_LOCAL */
1011 if (w->cb_fetch != NULL) { SvREFCNT_dec(SvRV(w->cb_fetch)); }
1012 if (w->cb_store != NULL) { SvREFCNT_dec(SvRV(w->cb_store)); }
1013 if (w->cb_exists != NULL) { SvREFCNT_dec(SvRV(w->cb_exists)); }
1014 if (w->cb_delete != NULL) { SvREFCNT_dec(SvRV(w->cb_delete)); }
1015 #endif /* VMG_UVAR */
1023 STATIC MGVTBL vmg_wizard_vtbl = {
1028 vmg_wizard_free, /* free */
1031 #endif /* MGf_COPY */
1034 #endif /* MGf_DUP */
1037 #endif /* MGf_LOCAL */
1040 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
1041 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
1042 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
1043 STATIC const char vmg_toomanysigs[] = "Too many magic signatures used";
1044 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
1045 STATIC const char vmg_globstorefail[] = "Couldn't store global wizard information";
1047 STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
1048 #define vmg_sv2sig(S) vmg_sv2sig(aTHX_ (S))
1053 } else if (SvNOK(sv)) {
1055 } else if ((SvPOK(sv) && grok_number(SvPVX(sv), SvCUR(sv), NULL))) {
1058 croak(vmg_invalid_sig);
1060 if (sig < SIG_MIN) { sig += SIG_MIN; }
1061 if (sig > SIG_MAX) { sig %= SIG_MAX + 1; }
1066 STATIC U16 vmg_wizard_sig(pTHX_ SV *wiz) {
1067 #define vmg_wizard_sig(W) vmg_wizard_sig(aTHX_ (W))
1072 sig = SV2MGWIZ(SvRV(wiz))->sig;
1073 } else if (SvOK(wiz)) {
1074 sig = vmg_sv2sig(wiz);
1076 croak(vmg_invalid_wiz);
1081 if (!hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))
1087 STATIC SV *vmg_wizard_wiz(pTHX_ SV *wiz) {
1088 #define vmg_wizard_wiz(W) vmg_wizard_wiz(aTHX_ (W))
1095 #if VMG_MULTIPLICITY
1096 if (SV2MGWIZ(wiz)->owner == aTHX)
1098 #endif /* VMG_MULTIPLICITY */
1099 sig = SV2MGWIZ(wiz)->sig;
1100 } else if (SvOK(wiz)) {
1101 sig = vmg_sv2sig(wiz);
1103 croak(vmg_invalid_wiz);
1108 return (old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))
1113 #define VMG_SET_CB(S, N) \
1115 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? newRV_inc(SvRV(cb)) : NULL;
1117 #define VMG_SET_SVT_CB(S, N) \
1119 if (SvOK(cb) && SvROK(cb)) { \
1120 t->svt_ ## N = vmg_svt_ ## N; \
1121 w->cb_ ## N = newRV_inc(SvRV(cb)); \
1123 t->svt_ ## N = NULL; \
1124 w->cb_ ## N = NULL; \
1129 #define VMG_CLONE_CB(N) \
1130 z->cb_ ## N = (w->cb_ ## N) ? newRV_inc(vmg_clone(SvRV(w->cb_ ## N), \
1134 STATIC MGWIZ *vmg_wizard_clone(pTHX_ const MGWIZ *w) {
1135 #define vmg_wizard_clone(W) vmg_wizard_clone(aTHX_ (W))
1140 Copy(w->vtbl, t, 1, MGVTBL);
1147 VMG_CLONE_CB(clear);
1151 #endif /* MGf_COPY */
1154 #endif /* MGf_DUP */
1156 VMG_CLONE_CB(local);
1157 #endif /* MGf_LOCAL */
1159 VMG_CLONE_CB(fetch);
1160 VMG_CLONE_CB(store);
1161 VMG_CLONE_CB(exists);
1162 VMG_CLONE_CB(delete);
1163 #endif /* VMG_UVAR */
1168 z->opinfo = w->opinfo;
1173 #endif /* VMG_THREADSAFE */
1175 /* --- XS ------------------------------------------------------------------ */
1177 MODULE = Variable::Magic PACKAGE = Variable::Magic
1185 MY_CXT.wizards = newHV();
1186 hv_iterinit(MY_CXT.wizards); /* Allocate iterator */
1187 MY_CXT.b__op_stashes[0] = NULL;
1188 stash = gv_stashpv(__PACKAGE__, 1);
1189 newCONSTSUB(stash, "SIG_MIN", newSVuv(SIG_MIN));
1190 newCONSTSUB(stash, "SIG_MAX", newSVuv(SIG_MAX));
1191 newCONSTSUB(stash, "SIG_NBR", newSVuv(SIG_NBR));
1192 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1193 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1194 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1195 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1196 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1197 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1198 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1199 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1200 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1201 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1202 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1203 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1204 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1205 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1206 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1207 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1217 U32 had_b__op_stash = 0;
1224 hv_iterinit(hv); /* Allocate iterator */
1225 hv_iterinit(MY_CXT.wizards);
1226 while ((key = hv_iternext(MY_CXT.wizards))) {
1228 char *sig = HePV(key, len);
1232 w = SV2MGWIZ(HeVAL(key));
1233 w = vmg_wizard_clone(w);
1235 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1236 mg->mg_private = SIG_WIZ;
1238 if (!hv_store(hv, sig, len, sv, HeHASH(key))) croak("%s during CLONE", vmg_globstorefail);
1240 for (c = 0; c < OPc_MAX; ++c) {
1241 if (MY_CXT.b__op_stashes[c])
1242 had_b__op_stash |= (((U32) 1) << c);
1247 MY_CXT.wizards = hv;
1248 for (c = 0; c < OPc_MAX; ++c) {
1249 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1250 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1254 #endif /* VMG_THREADSAFE */
1274 #endif /* MGf_COPY */
1277 #endif /* MGf_DUP */
1280 #endif /* MGf_LOCAL */
1283 #endif /* VMG_UVAR */
1284 ) { croak(vmg_wrongargnum); }
1289 sig = vmg_sv2sig(svsig);
1290 if ((old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))) {
1291 ST(0) = sv_2mortal(newRV_inc(*old));
1295 if (HvKEYS(MY_CXT.wizards) >= SIG_NBR) { croak(vmg_toomanysigs); }
1302 VMG_SET_CB(ST(i++), data);
1304 w->opinfo = SvOK(cb) ? SvUV(cb) : 0;
1306 vmg_op_info_init(w->opinfo);
1307 VMG_SET_SVT_CB(ST(i++), get);
1308 VMG_SET_SVT_CB(ST(i++), set);
1309 VMG_SET_SVT_CB(ST(i++), len);
1310 VMG_SET_SVT_CB(ST(i++), clear);
1311 VMG_SET_SVT_CB(ST(i++), free);
1313 VMG_SET_SVT_CB(ST(i++), copy);
1314 #endif /* MGf_COPY */
1316 /* VMG_SET_SVT_CB(ST(i++), dup); */
1320 #endif /* MGf_DUP */
1322 VMG_SET_SVT_CB(ST(i++), local);
1323 #endif /* MGf_LOCAL */
1325 VMG_SET_CB(ST(i++), fetch);
1326 VMG_SET_CB(ST(i++), store);
1327 VMG_SET_CB(ST(i++), exists);
1328 VMG_SET_CB(ST(i++), delete);
1330 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1331 w->uvar = SvTRUE(cb) ? 2 : 1;
1334 #endif /* VMG_UVAR */
1335 #if VMG_MULTIPLICITY
1337 #endif /* VMG_MULTIPLICITY */
1342 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1343 mg->mg_private = SIG_WIZ;
1346 if (!hv_store(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), sv, 0)) croak(vmg_globstorefail);
1348 RETVAL = newRV_noinc(sv);
1356 if (HvKEYS(MY_CXT.wizards) >= SIG_NBR) { croak(vmg_toomanysigs); }
1357 RETVAL = newSVuv(vmg_gensig());
1364 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
1365 RETVAL = newSVuv(SV2MGWIZ(SvRV(wiz))->sig);
1369 SV *cast(SV *sv, SV *wiz, ...)
1370 PROTOTYPE: \[$@%&*]$@
1375 wiz = vmg_wizard_wiz(wiz);
1381 av_fill(args, items - 2);
1382 for (i = 2; i < items; ++i) {
1385 if (av_store(args, i - 2, arg) == NULL) { croak(vmg_argstorefailed); }
1388 ret = newSVuv(vmg_cast(SvRV(sv), wiz, args));
1395 getdata(SV *sv, SV *wiz)
1396 PROTOTYPE: \[$@%&*]$
1401 sig = vmg_wizard_sig(wiz);
1404 data = vmg_data_get(SvRV(sv), sig);
1405 if (!data) { XSRETURN_UNDEF; }
1409 SV *dispell(SV *sv, SV *wiz)
1410 PROTOTYPE: \[$@%&*]$
1414 sig = vmg_wizard_sig(wiz);
1417 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));