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) 0u)
319 #define SIG_MAX ((U16) ((1u << 16) - 1))
320 #define SIG_NBR (SIG_MAX - SIG_MIN + 1)
322 #define SIG_WZO ((U16) (0x3891))
323 #define SIG_WIZ ((U16) (0x3892))
325 /* ... Generate signatures ................................................. */
327 STATIC U16 vmg_gensig(pTHX) {
328 #define vmg_gensig() vmg_gensig(aTHX)
334 sig = SIG_NBR * Drand01() + SIG_MIN;
335 } while (hv_exists(MY_CXT.wizards, buf, sprintf(buf, "%u", sig)));
340 /* --- MGWIZ structure ----------------------------------------------------- */
350 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
353 #endif /* MGf_COPY */
359 #endif /* MGf_LOCAL */
361 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
362 #endif /* VMG_UVAR */
365 #endif /* VMG_MULTIPLICITY */
368 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
369 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
371 /* ... Construct private data .............................................. */
373 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
374 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
376 I32 i, alen = (args == NULL) ? 0 : av_len(args);
384 EXTEND(SP, alen + 1);
385 PUSHs(sv_2mortal(newRV_inc(sv)));
386 for (i = 0; i < alen; ++i)
387 PUSHs(*av_fetch(args, i, 0));
390 call_sv(ctor, G_SCALAR);
394 #if VMG_HAS_PERL(5, 8, 3)
395 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
397 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
407 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
408 MAGIC *mg, *moremagic;
410 if (SvTYPE(sv) >= SVt_PVMG) {
411 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
412 moremagic = mg->mg_moremagic;
413 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
414 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
426 /* ... Magic cast/dispell .................................................. */
429 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
431 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
433 prevmagic->mg_moremagic = moremagic;
435 SvMAGIC_set(sv, moremagic);
437 mg->mg_moremagic = NULL;
438 Safefree(mg->mg_ptr);
441 #endif /* VMG_UVAR */
443 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz, AV *args) {
444 #define vmg_cast(S, W, A) vmg_cast(aTHX_ (S), (W), (A))
445 MAGIC *mg = NULL, *moremagic = NULL;
448 U32 oldgmg = SvGMAGICAL(sv);
452 if (SvTYPE(sv) >= SVt_PVMG) {
453 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
454 moremagic = mg->mg_moremagic;
455 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
456 MGWIZ *z = SV2MGWIZ(mg->mg_ptr);
457 if (z->sig == w->sig)
465 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
466 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
467 mg->mg_private = SIG_WIZ;
470 mg->mg_flags |= MGf_COPY;
471 #endif /* MGf_COPY */
474 mg->mg_flags |= MGf_DUP;
478 mg->mg_flags |= MGf_LOCAL;
479 #endif /* MGf_LOCAL */
481 if (SvTYPE(sv) < SVt_PVHV)
484 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
485 * magic is actually never called for them. If the GMAGICAL flag was off before
486 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
487 * now on, then this wizard has get magic. Hence we can work around the
488 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
489 * has uvar callbacks, it will be turned back on later. */
490 if (!oldgmg && SvGMAGICAL(sv))
498 uf[0].uf_val = vmg_svt_val;
505 /* One uvar magic in the chain is enough. */
506 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
507 moremagic = mg->mg_moremagic;
508 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
511 if (mg) { /* Found another uvar magic. */
512 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
513 if (olduf->uf_val == vmg_svt_val) {
514 /* It's our uvar magic, nothing to do. oldgmg was true. */
517 /* It's another uvar magic, backup it and replace it by ours. */
519 vmg_uvar_del(sv, prevmagic, mg, moremagic);
523 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
524 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
525 * handled by our uvar callback. */
527 #endif /* VMG_UVAR */
533 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
534 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
537 #endif /* VMG_UVAR */
538 MAGIC *mg, *prevmagic, *moremagic = NULL;
540 if (SvTYPE(sv) < SVt_PVMG) { return 0; }
542 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
543 moremagic = mg->mg_moremagic;
544 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
545 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
548 /* If the current has no uvar, short-circuit uvar deletion. */
549 uvars = w->uvar ? (uvars + 1) : 0;
550 #endif /* VMG_UVAR */
553 } else if (w->uvar) {
555 /* We can't break here since we need to find the ext magic to delete. */
556 #endif /* VMG_UVAR */
560 if (!mg) { return 0; }
563 prevmagic->mg_moremagic = moremagic;
565 SvMAGIC_set(sv, moremagic);
567 mg->mg_moremagic = NULL;
569 if (mg->mg_obj != sv) { SvREFCNT_dec(mg->mg_obj); } /* Destroy private data */
570 SvREFCNT_dec((SV *) mg->mg_ptr); /* Unreference the wizard */
574 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
575 /* mg was the first ext magic in the chain that had uvar */
577 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
578 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
579 MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
589 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
590 moremagic = mg->mg_moremagic;
591 if (mg->mg_type == PERL_MAGIC_uvar) { break; }
594 uf = (struct ufuncs *) mg->mg_ptr;
595 /* assert(uf->uf_val == vmg_svt_val); */
596 if (uf[1].uf_val || uf[1].uf_set) {
597 /* Revert the original uvar magic. */
599 Renew(uf, 1, struct ufuncs);
600 mg->mg_ptr = (char *) uf;
601 mg->mg_len = sizeof(struct ufuncs);
603 /* Remove the uvar magic. */
604 vmg_uvar_del(sv, prevmagic, mg, moremagic);
608 #endif /* VMG_UVAR */
613 /* ... OP info ............................................................. */
615 #define VMG_OP_INFO_NAME 1
616 #define VMG_OP_INFO_OBJECT 2
618 STATIC U32 vmg_op_name_init = 0;
619 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
621 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
622 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
624 case VMG_OP_INFO_NAME:
625 if (!vmg_op_name_init) {
627 for (t = 0; t < OP_max; ++t)
628 vmg_op_name_len[t] = strlen(PL_op_name[t]);
629 vmg_op_name_init = 1;
632 case VMG_OP_INFO_OBJECT: {
634 if (!MY_CXT.b__op_stashes[0]) {
637 for (c = 0; c < OPc_MAX; ++c)
638 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
647 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
648 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
653 case VMG_OP_INFO_NAME: {
654 OPCODE t = PL_op->op_type;
655 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
657 case VMG_OP_INFO_OBJECT: {
659 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
660 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
669 /* ... svt callbacks ....................................................... */
671 #define VMG_CB_CALL_SET_RET(D) \
676 ret = SvOK(svr) ? SvIV(svr) : (D); \
680 #define VMG_CB_CALL_ARGS_MASK 15
681 #define VMG_CB_CALL_ARGS_SHIFT 4
682 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
684 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
687 unsigned int i, args, opinfo;
691 args = flags & VMG_CB_CALL_ARGS_MASK;
692 flags >>= VMG_CB_CALL_ARGS_SHIFT;
693 opinfo = flags & VMG_CB_CALL_OPINFO;
699 EXTEND(SP, args + 1);
700 PUSHs(sv_2mortal(newRV_inc(sv)));
702 for (i = 0; i < args; ++i) {
703 SV *sva = va_arg(ap, SV *);
704 PUSHs(sva ? sva : &PL_sv_undef);
708 XPUSHs(vmg_op_info(opinfo));
711 call_sv(cb, G_SCALAR);
713 VMG_CB_CALL_SET_RET(0);
721 #define vmg_cb_call1(I, F, S, A1) \
722 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 1), (S), (A1))
723 #define vmg_cb_call2(I, F, S, A1, A2) \
724 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 2), (S), (A1), (A2))
725 #define vmg_cb_call3(I, F, S, A1, A2, A3) \
726 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 3), (S), (A1), (A2), (A3))
728 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
729 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
730 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
733 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
734 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
735 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
738 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
739 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
740 unsigned int opinfo = w->opinfo;
742 svtype t = SvTYPE(sv);
751 PUSHs(sv_2mortal(newRV_inc(sv)));
752 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
755 U8 *s = (U8 *) SvPV_const(sv, l);
757 len = utf8_length(s, s + l);
761 } else if (t == SVt_PVAV) {
762 len = av_len((AV *) sv) + 1;
769 XPUSHs(vmg_op_info(opinfo));
772 call_sv(w->cb_len, G_SCALAR);
774 VMG_CB_CALL_SET_RET(len);
779 return t == SVt_PVAV ? ret - 1 : ret;
782 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
783 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
784 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
787 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
789 unsigned int had_err, has_err, flags = G_SCALAR | G_EVAL;
794 /* Don't even bother if we are in global destruction - the wizard is prisoner
795 * of circular references and we are way beyond user realm */
799 w = SV2MGWIZ(mg->mg_ptr);
801 /* So that it survives the temp cleanup below */
804 #if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
805 /* The previous magic tokens were freed but the magic chain wasn't updated, so
806 * if you access the sv from the callback the old deleted magics will trigger
807 * and cause memory misreads. Change 32686 solved it that way : */
816 PUSHs(sv_2mortal(newRV_inc(sv)));
817 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
819 XPUSHs(vmg_op_info(w->opinfo));
822 had_err = SvTRUE(ERRSV);
826 call_sv(w->cb_free, flags);
828 has_err = SvTRUE(ERRSV);
829 if (IN_PERL_COMPILETIME && !had_err && has_err)
832 VMG_CB_CALL_SET_RET(0);
838 /* Get the eval context that was pushed by call_sv, and fake an entry for the
839 * namesv, as die_where will need it to be non NULL later */
840 PERL_CONTEXT *cx = cxstack + cxstack_ix + 1;
841 if (!cx->blk_eval.old_namesv)
842 cx->blk_eval.old_namesv
843 = sv_2mortal(newSVpvn_share("Variable/Magic/DUMMY.pm", 23, 0));
846 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
847 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
850 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
851 * mg->mg_ptr reference count */
856 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
857 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
864 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
867 if (keylen == HEf_SVKEY) {
870 keysv = newSVpvn(key, keylen);
873 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
875 if (keylen != HEf_SVKEY) {
881 #endif /* MGf_COPY */
884 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
890 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
891 const MGWIZ *w = SV2MGWIZ(mg->mg_ptr);
892 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
894 #endif /* MGf_LOCAL */
897 STATIC OP *vmg_pp_resetuvar(pTHX) {
898 SvRMAGICAL_on(cSVOP_sv);
902 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
905 SV *key = NULL, *newkey = NULL;
908 umg = mg_find(sv, PERL_MAGIC_uvar);
909 /* umg can't be NULL or we wouldn't be there. */
911 uf = (struct ufuncs *) umg->mg_ptr;
913 if (uf[1].uf_val != NULL) { uf[1].uf_val(aTHX_ action, sv); }
914 if (uf[1].uf_set != NULL) { uf[1].uf_set(aTHX_ action, sv); }
916 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
917 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
919 switch (mg->mg_type) {
922 case PERL_MAGIC_tied:
928 if (mg->mg_private != SIG_WIZ) continue;
929 w = SV2MGWIZ(mg->mg_ptr);
935 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
940 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
942 case HV_FETCH_ISSTORE:
943 case HV_FETCH_LVALUE:
944 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
946 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
948 case HV_FETCH_ISEXISTS:
950 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
954 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
959 if (SvRMAGICAL(sv) && !tied) {
960 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
961 * mistaken for a tied hash by the rest of hv_common. It will be reset by
962 * the op_ppaddr of a new fake op injected between the current and the next
965 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
967 NewOp(1101, svop, 1, SVOP);
968 svop->op_type = OP_STUB;
969 svop->op_ppaddr = vmg_pp_resetuvar;
970 svop->op_next = o->op_next;
973 o->op_next = (OP *) svop;
980 #endif /* VMG_UVAR */
982 /* ... Wizard destructor ................................................... */
984 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
988 if (PL_dirty) /* During global destruction, the context is already freed */
993 if (w->owner != aTHX)
996 #endif /* VMG_MULTIPLICITY */
1000 if (hv_delete(MY_CXT.wizards, buf, sprintf(buf, "%u", w->sig), 0) != wiz)
1003 SvFLAGS(wiz) |= SVf_BREAK;
1006 if (w->cb_data != NULL) { SvREFCNT_dec(SvRV(w->cb_data)); }
1007 if (w->cb_get != NULL) { SvREFCNT_dec(SvRV(w->cb_get)); }
1008 if (w->cb_set != NULL) { SvREFCNT_dec(SvRV(w->cb_set)); }
1009 if (w->cb_len != NULL) { SvREFCNT_dec(SvRV(w->cb_len)); }
1010 if (w->cb_clear != NULL) { SvREFCNT_dec(SvRV(w->cb_clear)); }
1011 if (w->cb_free != NULL) { SvREFCNT_dec(SvRV(w->cb_free)); }
1013 if (w->cb_copy != NULL) { SvREFCNT_dec(SvRV(w->cb_copy)); }
1014 #endif /* MGf_COPY */
1016 if (w->cb_dup != NULL) { SvREFCNT_dec(SvRV(w->cb_dup)); }
1017 #endif /* MGf_DUP */
1019 if (w->cb_local != NULL) { SvREFCNT_dec(SvRV(w->cb_local)); }
1020 #endif /* MGf_LOCAL */
1022 if (w->cb_fetch != NULL) { SvREFCNT_dec(SvRV(w->cb_fetch)); }
1023 if (w->cb_store != NULL) { SvREFCNT_dec(SvRV(w->cb_store)); }
1024 if (w->cb_exists != NULL) { SvREFCNT_dec(SvRV(w->cb_exists)); }
1025 if (w->cb_delete != NULL) { SvREFCNT_dec(SvRV(w->cb_delete)); }
1026 #endif /* VMG_UVAR */
1034 STATIC MGVTBL vmg_wizard_vtbl = {
1039 vmg_wizard_free, /* free */
1042 #endif /* MGf_COPY */
1045 #endif /* MGf_DUP */
1048 #endif /* MGf_LOCAL */
1051 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
1052 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
1053 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
1054 STATIC const char vmg_toomanysigs[] = "Too many magic signatures used";
1055 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
1056 STATIC const char vmg_globstorefail[] = "Couldn't store global wizard information";
1058 STATIC U16 vmg_sv2sig(pTHX_ SV *sv) {
1059 #define vmg_sv2sig(S) vmg_sv2sig(aTHX_ (S))
1064 } else if (SvNOK(sv)) {
1066 } else if ((SvPOK(sv) && grok_number(SvPVX(sv), SvCUR(sv), NULL))) {
1069 croak(vmg_invalid_sig);
1072 if (sig < SIG_MIN || sig > SIG_MAX)
1073 croak(vmg_invalid_sig);
1078 STATIC U16 vmg_wizard_sig(pTHX_ SV *wiz) {
1079 #define vmg_wizard_sig(W) vmg_wizard_sig(aTHX_ (W))
1084 sig = SV2MGWIZ(SvRV(wiz))->sig;
1085 } else if (SvOK(wiz)) {
1086 sig = vmg_sv2sig(wiz);
1088 croak(vmg_invalid_wiz);
1093 if (!hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))
1094 croak(vmg_invalid_wiz);
1100 STATIC SV *vmg_wizard_wiz(pTHX_ SV *wiz) {
1101 #define vmg_wizard_wiz(W) vmg_wizard_wiz(aTHX_ (W))
1108 #if VMG_MULTIPLICITY
1109 if (SV2MGWIZ(wiz)->owner == aTHX)
1111 #endif /* VMG_MULTIPLICITY */
1112 sig = SV2MGWIZ(wiz)->sig;
1113 } else if (SvOK(wiz)) {
1114 sig = vmg_sv2sig(wiz);
1116 croak(vmg_invalid_wiz);
1121 return (old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))
1126 #define VMG_SET_CB(S, N) \
1128 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? newRV_inc(SvRV(cb)) : NULL;
1130 #define VMG_SET_SVT_CB(S, N) \
1132 if (SvOK(cb) && SvROK(cb)) { \
1133 t->svt_ ## N = vmg_svt_ ## N; \
1134 w->cb_ ## N = newRV_inc(SvRV(cb)); \
1136 t->svt_ ## N = NULL; \
1137 w->cb_ ## N = NULL; \
1142 #define VMG_CLONE_CB(N) \
1143 z->cb_ ## N = (w->cb_ ## N) ? newRV_inc(vmg_clone(SvRV(w->cb_ ## N), \
1147 STATIC MGWIZ *vmg_wizard_clone(pTHX_ const MGWIZ *w) {
1148 #define vmg_wizard_clone(W) vmg_wizard_clone(aTHX_ (W))
1153 Copy(w->vtbl, t, 1, MGVTBL);
1160 VMG_CLONE_CB(clear);
1164 #endif /* MGf_COPY */
1167 #endif /* MGf_DUP */
1169 VMG_CLONE_CB(local);
1170 #endif /* MGf_LOCAL */
1172 VMG_CLONE_CB(fetch);
1173 VMG_CLONE_CB(store);
1174 VMG_CLONE_CB(exists);
1175 VMG_CLONE_CB(delete);
1176 #endif /* VMG_UVAR */
1181 z->opinfo = w->opinfo;
1186 #endif /* VMG_THREADSAFE */
1188 /* --- XS ------------------------------------------------------------------ */
1190 MODULE = Variable::Magic PACKAGE = Variable::Magic
1198 MY_CXT.wizards = newHV();
1199 hv_iterinit(MY_CXT.wizards); /* Allocate iterator */
1200 MY_CXT.b__op_stashes[0] = NULL;
1201 stash = gv_stashpv(__PACKAGE__, 1);
1202 newCONSTSUB(stash, "SIG_MIN", newSVuv(SIG_MIN));
1203 newCONSTSUB(stash, "SIG_MAX", newSVuv(SIG_MAX));
1204 newCONSTSUB(stash, "SIG_NBR", newSVuv(SIG_NBR));
1205 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1206 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1207 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1208 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1209 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1210 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1211 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1212 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1213 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1214 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1215 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1216 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1217 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1218 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1219 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1220 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1230 U32 had_b__op_stash = 0;
1237 hv_iterinit(hv); /* Allocate iterator */
1238 hv_iterinit(MY_CXT.wizards);
1239 while ((key = hv_iternext(MY_CXT.wizards))) {
1241 char *sig = HePV(key, len);
1245 w = SV2MGWIZ(HeVAL(key));
1246 w = vmg_wizard_clone(w);
1248 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
1249 mg->mg_private = SIG_WZO;
1251 if (!hv_store(hv, sig, len, sv, HeHASH(key))) croak("%s during CLONE", vmg_globstorefail);
1253 for (c = 0; c < OPc_MAX; ++c) {
1254 if (MY_CXT.b__op_stashes[c])
1255 had_b__op_stash |= (((U32) 1) << c);
1260 MY_CXT.wizards = hv;
1261 for (c = 0; c < OPc_MAX; ++c) {
1262 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1263 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1267 #endif /* VMG_THREADSAFE */
1287 #endif /* MGf_COPY */
1290 #endif /* MGf_DUP */
1293 #endif /* MGf_LOCAL */
1296 #endif /* VMG_UVAR */
1297 ) { croak(vmg_wrongargnum); }
1302 sig = vmg_sv2sig(svsig);
1303 if ((old = hv_fetch(MY_CXT.wizards, buf, sprintf(buf, "%u", sig), 0))) {
1304 ST(0) = sv_2mortal(newRV_inc(*old));
1308 if (HvKEYS(MY_CXT.wizards) >= SIG_NBR) { croak(vmg_toomanysigs); }
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);
1369 if (HvKEYS(MY_CXT.wizards) >= SIG_NBR) { croak(vmg_toomanysigs); }
1370 RETVAL = newSVuv(vmg_gensig());
1377 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
1378 RETVAL = newSVuv(SV2MGWIZ(SvRV(wiz))->sig);
1382 SV *cast(SV *sv, SV *wiz, ...)
1383 PROTOTYPE: \[$@%&*]$@
1388 wiz = vmg_wizard_wiz(wiz);
1394 av_fill(args, items - 2);
1395 for (i = 2; i < items; ++i) {
1398 if (av_store(args, i - 2, arg) == NULL) { croak(vmg_argstorefailed); }
1401 ret = newSVuv(vmg_cast(SvRV(sv), wiz, args));
1408 getdata(SV *sv, SV *wiz)
1409 PROTOTYPE: \[$@%&*]$
1414 sig = vmg_wizard_sig(wiz);
1415 data = vmg_data_get(SvRV(sv), sig);
1416 if (!data) { XSRETURN_UNDEF; }
1420 SV *dispell(SV *sv, SV *wiz)
1421 PROTOTYPE: \[$@%&*]$
1425 sig = vmg_wizard_sig(wiz);
1426 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));