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"
17 # define VOID2(T, P) static_cast<T>(P)
19 # define VOID2(T, P) (P)
22 #ifndef VMG_PERL_PATCHLEVEL
24 # define VMG_PERL_PATCHLEVEL PERL_PATCHNUM
26 # define VMG_PERL_PATCHLEVEL 0
30 #define VMG_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
32 #define VMG_HAS_PERL_BRANCH(R, V, S) (PERL_REVISION == (R) && PERL_VERSION == (V) && PERL_SUBVERSION >= (S))
34 #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))))
36 /* --- Threads and multiplicity -------------------------------------------- */
46 /* Safe unless stated otherwise in Makefile.PL */
48 # define VMG_FORKSAFE 1
51 #ifndef VMG_MULTIPLICITY
52 # if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
53 # define VMG_MULTIPLICITY 1
55 # define VMG_MULTIPLICITY 0
59 #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))
60 # define VMG_THREADSAFE 1
62 # define MY_CXT_CLONE \
64 my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
65 Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
66 sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
69 # define VMG_THREADSAFE 0
71 # define dMY_CXT dNOOP
73 # define MY_CXT vmg_globaldata
75 # define START_MY_CXT STATIC my_cxt_t MY_CXT;
77 # define MY_CXT_INIT NOOP
79 # define MY_CXT_CLONE NOOP
83 # define VMG_LOCK(M) MUTEX_LOCK(M)
84 # define VMG_UNLOCK(M) MUTEX_UNLOCK(M)
87 # define VMG_UNLOCK(M)
90 /* --- Compatibility ------------------------------------------------------- */
93 # define Newx(v, n, c) New(0, v, n, c)
97 # define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
101 # define SvRV_const(sv) SvRV((SV *) sv)
104 #ifndef SvREFCNT_inc_simple_void
105 # define SvREFCNT_inc_simple_void(sv) ((void) SvREFCNT_inc(sv))
109 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
112 #ifndef PERL_MAGIC_ext
113 # define PERL_MAGIC_ext '~'
116 #ifndef PERL_MAGIC_tied
117 # define PERL_MAGIC_tied 'P'
124 #ifndef IN_PERL_COMPILETIME
125 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
128 /* uvar magic and Hash::Util::FieldHash were commited with 28419, but we only
129 * enable them on 5.10 */
130 #if VMG_HAS_PERL(5, 10, 0)
136 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969) || VMG_HAS_PERL(5, 12, 0)
137 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
139 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
142 #if VMG_HAS_PERL(5, 17, 4)
143 # define VMG_COMPAT_SCALAR_NOLEN 1
145 # define VMG_COMPAT_SCALAR_NOLEN 0
148 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160, partially
149 * reverted to dev-5.11 as 9cdcb38b */
150 #if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
151 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
152 # if VMG_HAS_PERL(5, 11, 0)
153 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
155 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
158 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
159 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 1
162 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
163 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
165 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
166 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 0
170 /* Applied to dev-5.11 as 34908 */
171 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908) || VMG_HAS_PERL(5, 12, 0)
172 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
174 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
177 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
178 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
179 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
181 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
184 #if VMG_HAS_PERL(5, 11, 0)
185 # define VMG_COMPAT_HASH_DELETE_NOUVAR_VOID 1
187 # define VMG_COMPAT_HASH_DELETE_NOUVAR_VOID 0
190 #if VMG_HAS_PERL(5, 13, 2)
191 # define VMG_COMPAT_GLOB_GET 1
193 # define VMG_COMPAT_GLOB_GET 0
196 #define VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE (VMG_HAS_PERL(5, 10, 0) && !VMG_HAS_PERL(5, 10, 1))
198 /* NewOp() isn't public in perl 5.8.0. */
199 #define VMG_RESET_RMG_NEEDS_TRAMPOLINE (VMG_UVAR && (VMG_THREADSAFE || !VMG_HAS_PERL(5, 8, 1)))
201 /* ... Bug-free mg_magical ................................................. */
203 /* See the discussion at http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html */
205 #if VMG_HAS_PERL(5, 11, 3)
207 #define vmg_mg_magical(S) mg_magical(S)
211 STATIC void vmg_mg_magical(SV *sv) {
215 if ((mg = SvMAGIC(sv))) {
217 const MGVTBL* const vtbl = mg->mg_virtual;
219 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
226 } while ((mg = mg->mg_moremagic));
227 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
234 /* --- Trampoline ops ------------------------------------------------------ */
236 #define VMG_NEEDS_TRAMPOLINE VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE || VMG_RESET_RMG_NEEDS_TRAMPOLINE
238 #if VMG_NEEDS_TRAMPOLINE
245 STATIC void vmg_trampoline_init(vmg_trampoline *t, OP *(*cb)(pTHX)) {
246 t->temp.op_type = OP_STUB;
247 t->temp.op_ppaddr = 0;
248 t->temp.op_next = (OP *) &t->target;
249 t->temp.op_flags = 0;
250 t->temp.op_private = 0;
252 t->target.op_type = OP_STUB;
253 t->target.op_ppaddr = cb;
254 t->target.op_next = NULL;
255 t->target.op_flags = 0;
256 t->target.op_private = 0;
257 t->target.op_sv = NULL;
260 STATIC OP *vmg_trampoline_bump(pTHX_ vmg_trampoline *t, SV *sv, OP *o) {
261 #define vmg_trampoline_bump(T, S, O) vmg_trampoline_bump(aTHX_ (T), (S), (O))
263 t->temp.op_next = (OP *) &t->target;
265 t->target.op_sv = sv;
266 t->target.op_next = o->op_next;
271 #endif /* VMG_NEEDS_TRAMPOLINE */
273 /* --- Safe version of call_sv() ------------------------------------------- */
275 STATIC I32 vmg_call_sv(pTHX_ SV *sv, I32 flags, int (*cleanup)(pTHX_ void *), void *ud) {
276 #define vmg_call_sv(S, F, C, U) vmg_call_sv(aTHX_ (S), (F), (C), (U))
278 PERL_CONTEXT saved_cx;
286 cxix = (cxstack_ix < cxstack_max) ? (cxstack_ix + 1) : Perl_cxinc(aTHX);
287 /* The last popped context will be reused by call_sv(), but our callers may
288 * still need its previous value. Back it up so that it isn't clobbered. */
289 saved_cx = cxstack[cxix];
291 ret = call_sv(sv, flags | G_EVAL);
293 cxstack[cxix] = saved_cx;
297 sv_setsv(old_err, ERRSV);
301 if (IN_PERL_COMPILETIME) {
304 sv_catsv(PL_errors, ERRSV);
306 Perl_warn(aTHX_ "%s", SvPV_nolen(ERRSV));
309 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
311 ++PL_parser->error_count;
312 #elif defined(PL_error_count)
318 if (!cleanup || cleanup(aTHX_ ud))
331 /* --- Stolen chunk of B --------------------------------------------------- */
349 STATIC const char *const vmg_opclassnames[] = {
364 STATIC opclass vmg_opclass(const OP *o) {
371 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
373 if (o->op_type == OP_SASSIGN)
374 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
376 if (o->op_type == OP_AELEMFAST) {
377 #if PERL_VERSION <= 14
378 if (o->op_flags & OPf_SPECIAL)
390 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
394 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
411 case OA_PVOP_OR_SVOP:
412 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
417 case OA_BASEOP_OR_UNOP:
418 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
420 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
422 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
424 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
427 if (o->op_flags & OPf_STACKED)
429 else if (o->op_flags & OPf_SPECIAL)
438 /* --- Error messages ------------------------------------------------------ */
440 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
441 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
442 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
444 /* --- Context-safe global data -------------------------------------------- */
446 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
449 HV *b__op_stashes[OPc_MAX];
452 #if VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE
453 vmg_trampoline propagate_errsv;
455 #if VMG_RESET_RMG_NEEDS_TRAMPOLINE
456 vmg_trampoline reset_rmg;
462 /* --- <vmg_vtable> structure ---------------------------------------------- */
471 STATIC vmg_vtable *vmg_vtable_alloc(pTHX) {
472 #define vmg_vtable_alloc() vmg_vtable_alloc(aTHX)
475 t = VOID2(vmg_vtable *, PerlMemShared_malloc(sizeof *t));
477 t->vtbl = VOID2(MGVTBL *, PerlMemShared_malloc(sizeof *t->vtbl));
483 #define vmg_vtable_vtbl(T) (T)->vtbl
485 STATIC perl_mutex vmg_vtable_refcount_mutex;
487 STATIC vmg_vtable *vmg_vtable_dup(pTHX_ vmg_vtable *t) {
488 #define vmg_vtable_dup(T) vmg_vtable_dup(aTHX_ (T))
489 VMG_LOCK(&vmg_vtable_refcount_mutex);
491 VMG_UNLOCK(&vmg_vtable_refcount_mutex);
496 STATIC void vmg_vtable_free(pTHX_ vmg_vtable *t) {
497 #define vmg_vtable_free(T) vmg_vtable_free(aTHX_ (T))
500 VMG_LOCK(&vmg_vtable_refcount_mutex);
501 refcount = --t->refcount;
502 VMG_UNLOCK(&vmg_vtable_refcount_mutex);
505 PerlMemShared_free(t->vtbl);
506 PerlMemShared_free(t);
510 #else /* VMG_THREADSAFE */
512 typedef MGVTBL vmg_vtable;
514 STATIC vmg_vtable *vmg_vtable_alloc(pTHX) {
515 #define vmg_vtable_alloc() vmg_vtable_alloc(aTHX)
518 Newx(t, 1, vmg_vtable);
523 #define vmg_vtable_vtbl(T) ((MGVTBL *) (T))
525 #define vmg_vtable_free(T) Safefree(T)
527 #endif /* !VMG_THREADSAFE */
529 /* --- <vmg_wizard> structure ---------------------------------------------- */
538 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
543 #endif /* MGf_LOCAL */
545 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
546 #endif /* VMG_UVAR */
549 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo);
551 STATIC vmg_wizard *vmg_wizard_alloc(pTHX_ UV opinfo) {
552 #define vmg_wizard_alloc(O) vmg_wizard_alloc(aTHX_ (O))
555 Newx(w, 1, vmg_wizard);
558 w->opinfo = (U8) ((opinfo < 255) ? opinfo : 255);
560 vmg_op_info_init(aTHX_ w->opinfo);
562 w->vtable = vmg_vtable_alloc();
567 STATIC void vmg_wizard_free(pTHX_ vmg_wizard *w) {
568 #define vmg_wizard_free(W) vmg_wizard_free(aTHX_ (W))
572 /* During global destruction, any of the callbacks may already have been
573 * freed, so we can't rely on still being able to access them. */
575 SvREFCNT_dec(w->cb_data);
576 SvREFCNT_dec(w->cb_get);
577 SvREFCNT_dec(w->cb_set);
578 SvREFCNT_dec(w->cb_len);
579 SvREFCNT_dec(w->cb_clear);
580 SvREFCNT_dec(w->cb_free);
581 SvREFCNT_dec(w->cb_copy);
583 SvREFCNT_dec(w->cb_dup);
586 SvREFCNT_dec(w->cb_local);
587 #endif /* MGf_LOCAL */
589 SvREFCNT_dec(w->cb_fetch);
590 SvREFCNT_dec(w->cb_store);
591 SvREFCNT_dec(w->cb_exists);
592 SvREFCNT_dec(w->cb_delete);
593 #endif /* VMG_UVAR */
596 /* PerlMemShared_free() and Safefree() are still fine during global
597 * destruction though. */
598 vmg_vtable_free(w->vtable);
606 #define VMG_CLONE_CB(N) \
607 z->cb_ ## N = (w->cb_ ## N) ? SvREFCNT_inc(sv_dup(w->cb_ ## N, params)) \
610 STATIC const vmg_wizard *vmg_wizard_dup(pTHX_ const vmg_wizard *w, CLONE_PARAMS *params) {
611 #define vmg_wizard_dup(W, P) vmg_wizard_dup(aTHX_ (W), (P))
617 Newx(z, 1, vmg_wizard);
619 z->vtable = vmg_vtable_dup(w->vtable);
621 z->opinfo = w->opinfo;
633 #endif /* MGf_LOCAL */
637 VMG_CLONE_CB(exists);
638 VMG_CLONE_CB(delete);
639 #endif /* VMG_UVAR */
644 #endif /* VMG_THREADSAFE */
646 #define vmg_wizard_id(W) PTR2IV(vmg_vtable_vtbl((W)->vtable))
648 /* --- Wizard SV objects --------------------------------------------------- */
650 STATIC int vmg_wizard_sv_free(pTHX_ SV *sv, MAGIC *mg) {
651 vmg_wizard_free((vmg_wizard *) mg->mg_ptr);
658 STATIC int vmg_wizard_sv_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *params) {
659 mg->mg_ptr = (char *) vmg_wizard_dup((const vmg_wizard *) mg->mg_ptr, params);
664 #endif /* VMG_THREADSAFE */
666 STATIC MGVTBL vmg_wizard_sv_vtbl = {
671 vmg_wizard_sv_free, /* free */
674 vmg_wizard_sv_dup, /* dup */
680 #endif /* MGf_LOCAL */
683 STATIC SV *vmg_wizard_sv_new(pTHX_ const vmg_wizard *w) {
684 #define vmg_wizard_sv_new(W) vmg_wizard_sv_new(aTHX_ (W))
690 wiz = newSViv(PTR2IV(w));
694 MAGIC *mg = sv_magicext(wiz, NULL, PERL_MAGIC_ext, &vmg_wizard_sv_vtbl,
695 (const char *) w, 0);
698 mg->mg_flags |= MGf_DUP;
708 #define vmg_sv_has_wizard_type(S) (SvTYPE(S) >= SVt_PVMG)
710 STATIC const vmg_wizard *vmg_wizard_from_sv_nocheck(const SV *wiz) {
713 for (mg = SvMAGIC(wiz); mg; mg = mg->mg_moremagic) {
714 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_virtual == &vmg_wizard_sv_vtbl)
715 return (const vmg_wizard *) mg->mg_ptr;
721 #else /* VMG_THREADSAFE */
723 #define vmg_sv_has_wizard_type(S) SvIOK(S)
725 #define vmg_wizard_from_sv_nocheck(W) INT2PTR(const vmg_wizard *, SvIVX(W))
727 #endif /* !VMG_THREADSAFE */
729 #define vmg_wizard_from_sv(W) (vmg_sv_has_wizard_type(W) ? vmg_wizard_from_sv_nocheck(W) : NULL)
731 STATIC const vmg_wizard *vmg_wizard_from_mg(const MAGIC *mg) {
732 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_len == HEf_SVKEY) {
733 SV *sv = (SV *) mg->mg_ptr;
735 if (vmg_sv_has_wizard_type(sv))
736 return vmg_wizard_from_sv_nocheck(sv);
742 #define vmg_wizard_from_mg_nocheck(M) vmg_wizard_from_sv_nocheck((const SV *) (M)->mg_ptr)
744 /* --- User-level functions implementation --------------------------------- */
746 STATIC const MAGIC *vmg_find(const SV *sv, const vmg_wizard *w) {
750 if (SvTYPE(sv) < SVt_PVMG)
753 wid = vmg_wizard_id(w);
755 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
756 const vmg_wizard *z = vmg_wizard_from_mg(mg);
758 if (z && vmg_wizard_id(z) == wid)
765 /* ... Construct private data .............................................. */
767 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, SV **args, I32 items) {
768 #define vmg_data_new(C, S, A, I) vmg_data_new(aTHX_ (C), (S), (A), (I))
778 EXTEND(SP, items + 1);
779 PUSHs(sv_2mortal(newRV_inc(sv)));
780 for (i = 0; i < items; ++i)
784 vmg_call_sv(ctor, G_SCALAR, 0, NULL);
788 #if VMG_HAS_PERL(5, 8, 3)
789 SvREFCNT_inc_simple_void(nsv); /* Or it will be destroyed in FREETMPS */
791 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
801 STATIC SV *vmg_data_get(pTHX_ SV *sv, const vmg_wizard *w) {
802 #define vmg_data_get(S, W) vmg_data_get(aTHX_ (S), (W))
803 const MAGIC *mg = vmg_find(sv, w);
805 return mg ? mg->mg_obj : NULL;
808 /* ... Magic cast/dispell .................................................. */
812 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
815 struct ufuncs new_uf;
816 struct ufuncs old_uf;
819 #endif /* VMG_UVAR */
821 STATIC void vmg_mg_del(pTHX_ SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
822 #define vmg_mg_del(S, P, M, N) vmg_mg_del(aTHX_ (S), (P), (M), (N))
826 prevmagic->mg_moremagic = moremagic;
828 SvMAGIC_set(sv, moremagic);
830 /* Destroy private data */
832 if (mg->mg_type == PERL_MAGIC_uvar) {
833 Safefree(mg->mg_ptr);
835 #endif /* VMG_UVAR */
836 if (mg->mg_obj != sv) {
837 SvREFCNT_dec(mg->mg_obj);
840 /* Unreference the wizard */
841 SvREFCNT_dec((SV *) mg->mg_ptr);
845 #endif /* VMG_UVAR */
848 mg->mg_moremagic = MY_CXT.freed_tokens;
849 MY_CXT.freed_tokens = mg;
851 mg->mg_moremagic = NULL;
856 STATIC int vmg_magic_chain_free(pTHX_ MAGIC *mg, MAGIC *skip) {
857 #define vmg_magic_chain_free(M, S) vmg_magic_chain_free(aTHX_ (M), (S))
861 MAGIC *moremagic = mg->mg_moremagic;
874 STATIC UV vmg_cast(pTHX_ SV *sv, const vmg_wizard *w, const SV *wiz, SV **args, I32 items) {
875 #define vmg_cast(S, W, WIZ, A, I) vmg_cast(aTHX_ (S), (W), (WIZ), (A), (I))
884 oldgmg = SvGMAGICAL(sv);
886 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args, items) : NULL;
888 t = vmg_vtable_vtbl(w->vtable);
889 mg = sv_magicext(sv, data, PERL_MAGIC_ext, t, (const char *) wiz, HEf_SVKEY);
892 /* sv_magicext() calls mg_magical and increments data's refcount */
896 mg->mg_flags |= MGf_COPY;
899 mg->mg_flags |= MGf_DUP;
903 mg->mg_flags |= MGf_LOCAL;
904 #endif /* MGf_LOCAL */
906 if (SvTYPE(sv) < SVt_PVHV)
909 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
910 * magic is actually never called for them. If the GMAGICAL flag was off before
911 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
912 * now on, then this wizard has get magic. Hence we can work around the
913 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
914 * has uvar callbacks, it will be turned back on later. */
915 if (!oldgmg && SvGMAGICAL(sv))
920 MAGIC *prevmagic, *moremagic = NULL;
923 ud.new_uf.uf_val = vmg_svt_val;
924 ud.new_uf.uf_set = NULL;
925 ud.new_uf.uf_index = 0;
926 ud.old_uf.uf_val = NULL;
927 ud.old_uf.uf_set = NULL;
928 ud.old_uf.uf_index = 0;
930 /* One uvar magic in the chain is enough. */
931 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
932 moremagic = mg->mg_moremagic;
933 if (mg->mg_type == PERL_MAGIC_uvar)
937 if (mg) { /* Found another uvar magic. */
938 struct ufuncs *uf = (struct ufuncs *) mg->mg_ptr;
939 if (uf->uf_val == vmg_svt_val) {
940 /* It's our uvar magic, nothing to do. oldgmg was true. */
943 /* It's another uvar magic, backup it and replace it by ours. */
945 vmg_mg_del(sv, prevmagic, mg, moremagic);
949 sv_magic(sv, NULL, PERL_MAGIC_uvar, (const char *) &ud, sizeof(ud));
951 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
952 * handled by our uvar callback. */
954 #endif /* VMG_UVAR */
960 STATIC UV vmg_dispell(pTHX_ SV *sv, const vmg_wizard *w) {
961 #define vmg_dispell(S, W) vmg_dispell(aTHX_ (S), (W))
964 #endif /* VMG_UVAR */
965 MAGIC *mg, *prevmagic, *moremagic = NULL;
966 IV wid = vmg_wizard_id(w);
968 if (SvTYPE(sv) < SVt_PVMG)
971 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
974 moremagic = mg->mg_moremagic;
976 z = vmg_wizard_from_mg(mg);
978 IV zid = vmg_wizard_id(z);
982 /* If the current has no uvar, short-circuit uvar deletion. */
983 uvars = z->uvar ? (uvars + 1) : 0;
985 } else if (z->uvar) {
987 /* We can't break here since we need to find the ext magic to delete. */
992 #endif /* !VMG_UVAR */
998 vmg_mg_del(sv, prevmagic, mg, moremagic);
1001 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
1002 /* mg was the first ext magic in the chain that had uvar */
1004 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
1005 const vmg_wizard *z = vmg_wizard_from_mg(mg);
1016 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
1017 moremagic = mg->mg_moremagic;
1018 if (mg->mg_type == PERL_MAGIC_uvar)
1022 ud = (vmg_uvar_ud *) mg->mg_ptr;
1023 if (ud->old_uf.uf_val || ud->old_uf.uf_set) {
1024 /* Revert the original uvar magic. */
1026 Newx(uf, 1, struct ufuncs);
1029 mg->mg_ptr = (char *) uf;
1030 mg->mg_len = sizeof(*uf);
1032 /* Remove the uvar magic. */
1033 vmg_mg_del(sv, prevmagic, mg, moremagic);
1037 #endif /* VMG_UVAR */
1044 /* ... OP info ............................................................. */
1046 #define VMG_OP_INFO_NAME 1
1047 #define VMG_OP_INFO_OBJECT 2
1050 STATIC perl_mutex vmg_op_name_init_mutex;
1053 STATIC U32 vmg_op_name_init = 0;
1054 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
1056 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
1057 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
1059 case VMG_OP_INFO_NAME:
1060 VMG_LOCK(&vmg_op_name_init_mutex);
1061 if (!vmg_op_name_init) {
1063 for (t = 0; t < OP_max; ++t)
1064 vmg_op_name_len[t] = strlen(PL_op_name[t]);
1065 vmg_op_name_init = 1;
1067 VMG_UNLOCK(&vmg_op_name_init_mutex);
1069 case VMG_OP_INFO_OBJECT: {
1071 if (!MY_CXT.b__op_stashes[0]) {
1074 for (c = OPc_NULL; c < OPc_MAX; ++c)
1075 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
1084 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
1085 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
1087 return &PL_sv_undef;
1090 case VMG_OP_INFO_NAME: {
1091 OPCODE t = PL_op->op_type;
1092 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
1094 case VMG_OP_INFO_OBJECT: {
1096 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
1097 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
1103 return &PL_sv_undef;
1106 /* --- svt callbacks ------------------------------------------------------- */
1108 #define VMG_CB_CALL_ARGS_MASK 15
1109 #define VMG_CB_CALL_ARGS_SHIFT 4
1110 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT) /* 1|2 */
1111 #define VMG_CB_CALL_GUARD 4
1113 STATIC int vmg_dispell_guard_oncroak(pTHX_ void *ud) {
1118 /* If we're at the upmost magic call and we're about to die, we can just free
1119 * the tokens right now, since we will jump past the problematic part of our
1121 if (MY_CXT.depth == 0 && MY_CXT.freed_tokens) {
1122 vmg_magic_chain_free(MY_CXT.freed_tokens, NULL);
1123 MY_CXT.freed_tokens = NULL;
1129 STATIC int vmg_dispell_guard_free(pTHX_ SV *sv, MAGIC *mg) {
1130 vmg_magic_chain_free((MAGIC *) mg->mg_ptr, NULL);
1137 STATIC int vmg_dispell_guard_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *params) {
1138 /* The freed magic tokens aren't cloned by perl because it cannot reach them
1139 * (they have been detached from their parent SV when they were enqueued).
1140 * Hence there's nothing to purge in the new thread. */
1146 #endif /* VMG_THREADSAFE */
1148 STATIC MGVTBL vmg_dispell_guard_vtbl = {
1153 vmg_dispell_guard_free, /* free */
1156 vmg_dispell_guard_dup, /* dup */
1162 #endif /* MGf_LOCAL */
1165 STATIC SV *vmg_dispell_guard_new(pTHX_ MAGIC *root) {
1166 #define vmg_dispell_guard_new(R) vmg_dispell_guard_new(aTHX_ (R))
1169 guard = sv_newmortal();
1170 sv_magicext(guard, NULL, PERL_MAGIC_ext, &vmg_dispell_guard_vtbl,
1176 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
1179 unsigned int i, args, opinfo;
1180 MAGIC **chain = NULL;
1185 args = flags & VMG_CB_CALL_ARGS_MASK;
1186 flags >>= VMG_CB_CALL_ARGS_SHIFT;
1187 opinfo = flags & VMG_CB_CALL_OPINFO;
1193 EXTEND(SP, args + 1);
1194 PUSHs(sv_2mortal(newRV_inc(sv)));
1196 for (i = 0; i < args; ++i) {
1197 SV *sva = va_arg(ap, SV *);
1198 PUSHs(sva ? sva : &PL_sv_undef);
1202 XPUSHs(vmg_op_info(opinfo));
1205 if (flags & VMG_CB_CALL_GUARD) {
1208 vmg_call_sv(cb, G_SCALAR, vmg_dispell_guard_oncroak, NULL);
1210 if (MY_CXT.depth == 0 && MY_CXT.freed_tokens)
1211 chain = &MY_CXT.freed_tokens;
1213 vmg_call_sv(cb, G_SCALAR, 0, NULL);
1219 ret = (int) SvIV(svr);
1226 vmg_dispell_guard_new(*chain);
1233 #define VMG_CB_FLAGS(OI, A) \
1234 ((((unsigned int) (OI)) << VMG_CB_CALL_ARGS_SHIFT) | (A))
1236 #define vmg_cb_call1(I, OI, S, A1) \
1237 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 1), (S), (A1))
1238 #define vmg_cb_call2(I, OI, S, A1, A2) \
1239 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 2), (S), (A1), (A2))
1240 #define vmg_cb_call3(I, OI, S, A1, A2, A3) \
1241 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 3), (S), (A1), (A2), (A3))
1243 /* ... Default no-op magic callback ........................................ */
1245 STATIC int vmg_svt_default_noop(pTHX_ SV *sv, MAGIC *mg) {
1249 /* ... get magic ........................................................... */
1251 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
1252 const vmg_wizard *w = vmg_wizard_from_mg_nocheck(mg);
1254 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
1257 #define vmg_svt_get_noop vmg_svt_default_noop
1259 /* ... set magic ........................................................... */
1261 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
1262 const vmg_wizard *w = vmg_wizard_from_mg_nocheck(mg);
1264 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
1267 #define vmg_svt_set_noop vmg_svt_default_noop
1269 /* ... len magic ........................................................... */
1271 STATIC U32 vmg_sv_len(pTHX_ SV *sv) {
1272 #define vmg_sv_len(S) vmg_sv_len(aTHX_ (S))
1274 #if VMG_HAS_PERL(5, 9, 3)
1275 const U8 *s = VOID2(const U8 *, VOID2(const void *, SvPV_const(sv, len)));
1277 U8 *s = SvPV(sv, len);
1280 return DO_UTF8(sv) ? utf8_length(s, s + len) : len;
1283 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
1284 const vmg_wizard *w = vmg_wizard_from_mg_nocheck(mg);
1285 unsigned int opinfo = w->opinfo;
1288 svtype t = SvTYPE(sv);
1297 PUSHs(sv_2mortal(newRV_inc(sv)));
1298 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1300 len = vmg_sv_len(sv);
1302 } else if (t == SVt_PVAV) {
1303 len = av_len((AV *) sv) + 1;
1307 PUSHs(&PL_sv_undef);
1310 XPUSHs(vmg_op_info(opinfo));
1313 vmg_call_sv(w->cb_len, G_SCALAR, 0, NULL);
1317 ret = SvOK(svr) ? (U32) SvUV(svr) : len;
1328 STATIC U32 vmg_svt_len_noop(pTHX_ SV *sv, MAGIC *mg) {
1330 svtype t = SvTYPE(sv);
1333 len = vmg_sv_len(sv);
1334 } else if (t == SVt_PVAV) {
1335 len = (U32) av_len((AV *) sv);
1341 /* ... clear magic ......................................................... */
1343 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
1344 const vmg_wizard *w = vmg_wizard_from_mg_nocheck(mg);
1345 unsigned int flags = w->opinfo;
1347 #if !VMG_HAS_PERL(5, 12, 0)
1348 flags |= VMG_CB_CALL_GUARD;
1351 return vmg_cb_call1(w->cb_clear, flags, sv, mg->mg_obj);
1354 #define vmg_svt_clear_noop vmg_svt_default_noop
1356 /* ... free magic .......................................................... */
1358 #if VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE
1360 STATIC OP *vmg_pp_propagate_errsv(pTHX) {
1361 SVOP *o = cSVOPx(PL_op);
1364 SvREFCNT_dec(ERRSV);
1372 #endif /* VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE */
1374 STATIC int vmg_propagate_errsv_free(pTHX_ SV *sv, MAGIC *mg) {
1378 mg->mg_flags &= ~MGf_REFCOUNTED;
1384 /* perl is already kind enough to handle the cloning of the mg_obj member,
1385 hence we don't need to define a dup magic callback. */
1387 STATIC MGVTBL vmg_propagate_errsv_vtbl = {
1392 vmg_propagate_errsv_free, /* free */
1397 #endif /* MGf_LOCAL */
1404 } vmg_svt_free_cleanup_ud;
1406 STATIC int vmg_svt_free_cleanup(pTHX_ void *ud_) {
1407 vmg_svt_free_cleanup_ud *ud = VOID2(vmg_svt_free_cleanup_ud *, ud_);
1410 U32 optype = PL_op ? PL_op->op_type : OP_NULL;
1412 if (optype == OP_LEAVETRY || optype == OP_LEAVEEVAL) {
1413 SV *errsv = newSVsv(ERRSV);
1416 LEAVE_SCOPE(ud->base);
1418 #if VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE
1419 if (optype == OP_LEAVETRY) {
1421 PL_op = vmg_trampoline_bump(&MY_CXT.propagate_errsv, errsv, PL_op);
1422 } else if (optype == OP_LEAVEEVAL) {
1423 SV *guard = sv_newmortal();
1424 sv_magicext(guard, errsv, PERL_MAGIC_ext, &vmg_propagate_errsv_vtbl,
1427 #else /* !VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE */
1428 # if !VMG_HAS_PERL(5, 8, 9)
1430 SV *guard = sv_newmortal();
1431 sv_magicext(guard, errsv, PERL_MAGIC_ext, &vmg_propagate_errsv_vtbl,
1435 sv_magicext(ERRSV, errsv, PERL_MAGIC_ext, &vmg_propagate_errsv_vtbl,
1437 SvREFCNT_dec(errsv);
1439 #endif /* VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE */
1444 /* Don't propagate */
1450 /* We are about to croak() while sv is being destroyed. Try to clean up
1454 vmg_mg_del(sv, NULL, mg, mg->mg_moremagic);
1459 vmg_dispell_guard_oncroak(aTHX_ NULL);
1461 /* After that, propagate the error upwards. */
1466 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
1467 vmg_svt_free_cleanup_ud ud;
1468 const vmg_wizard *w;
1474 /* During global destruction, we cannot be sure that the wizard and its free
1475 * callback are still alive. */
1479 w = vmg_wizard_from_mg_nocheck(mg);
1481 /* So that it survives the temp cleanup below */
1482 SvREFCNT_inc_simple_void(sv);
1484 #if !(VMG_HAS_PERL_MAINT(5, 11, 0, 32686) || VMG_HAS_PERL(5, 12, 0))
1485 /* The previous magic tokens were freed but the magic chain wasn't updated, so
1486 * if you access the sv from the callback the old deleted magics will trigger
1487 * and cause memory misreads. Change 32686 solved it that way : */
1488 SvMAGIC_set(sv, mg);
1492 if (cxstack_ix < cxstack_max) {
1493 ud.in_eval = (CxTYPE(cxstack + cxstack_ix + 1) == CXt_EVAL);
1494 ud.base = ud.in_eval ? PL_scopestack[PL_scopestack_ix] : 0;
1505 PUSHs(sv_2mortal(newRV_inc(sv)));
1506 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1508 XPUSHs(vmg_op_info(w->opinfo));
1514 vmg_call_sv(w->cb_free, G_SCALAR, vmg_svt_free_cleanup, &ud);
1516 if (MY_CXT.depth == 0 && MY_CXT.freed_tokens) {
1517 /* Free all the tokens in the chain but the current one (if it's present).
1518 * It will be taken care of by our caller, Perl_mg_free(). */
1519 vmg_magic_chain_free(MY_CXT.freed_tokens, mg);
1520 MY_CXT.freed_tokens = NULL;
1527 ret = (int) SvIV(svr);
1533 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
1534 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
1537 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
1538 * mg->mg_ptr reference count */
1542 #define vmg_svt_free_noop vmg_svt_default_noop
1544 #if VMG_HAS_PERL_MAINT(5, 11, 0, 33256) || VMG_HAS_PERL(5, 12, 0)
1545 # define VMG_SVT_COPY_KEYLEN_TYPE I32
1547 # define VMG_SVT_COPY_KEYLEN_TYPE int
1550 /* ... copy magic .......................................................... */
1552 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key, VMG_SVT_COPY_KEYLEN_TYPE keylen) {
1553 const vmg_wizard *w = vmg_wizard_from_mg_nocheck(mg);
1557 if (keylen == HEf_SVKEY) {
1560 keysv = newSVpvn(key, keylen);
1563 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
1565 if (keylen != HEf_SVKEY) {
1566 SvREFCNT_dec(keysv);
1572 STATIC int vmg_svt_copy_noop(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key, VMG_SVT_COPY_KEYLEN_TYPE keylen) {
1576 /* ... dup magic ........................................................... */
1579 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
1582 #define vmg_svt_dup_noop vmg_svt_dup
1585 /* ... local magic ......................................................... */
1589 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
1590 const vmg_wizard *w = vmg_wizard_from_mg_nocheck(mg);
1592 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
1595 #define vmg_svt_local_noop vmg_svt_default_noop
1597 #endif /* MGf_LOCAL */
1599 /* ... uvar magic .......................................................... */
1603 STATIC OP *vmg_pp_reset_rmg(pTHX) {
1604 SVOP *o = cSVOPx(PL_op);
1606 SvRMAGICAL_on(o->op_sv);
1612 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
1614 MAGIC *mg, *umg, *moremagic;
1615 SV *key = NULL, *newkey = NULL;
1618 umg = mg_find(sv, PERL_MAGIC_uvar);
1619 /* umg can't be NULL or we wouldn't be there. */
1621 ud = (vmg_uvar_ud *) umg->mg_ptr;
1623 if (ud->old_uf.uf_val)
1624 ud->old_uf.uf_val(aTHX_ action, sv);
1625 if (ud->old_uf.uf_set)
1626 ud->old_uf.uf_set(aTHX_ action, sv);
1628 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
1629 const vmg_wizard *w;
1631 /* mg may be freed later by the uvar call, so we need to fetch the next
1632 * token before reaching that fateful point. */
1633 moremagic = mg->mg_moremagic;
1635 switch (mg->mg_type) {
1636 case PERL_MAGIC_ext:
1638 case PERL_MAGIC_tied:
1645 w = vmg_wizard_from_mg(mg);
1654 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
1658 & (HV_FETCH_ISSTORE|HV_FETCH_ISEXISTS|HV_FETCH_LVALUE|HV_DELETE)) {
1661 vmg_cb_call2(w->cb_fetch, w->opinfo | VMG_CB_CALL_GUARD, sv,
1664 case HV_FETCH_ISSTORE:
1665 case HV_FETCH_LVALUE:
1666 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
1668 vmg_cb_call2(w->cb_store, w->opinfo | VMG_CB_CALL_GUARD, sv,
1671 case HV_FETCH_ISEXISTS:
1673 vmg_cb_call2(w->cb_exists, w->opinfo | VMG_CB_CALL_GUARD, sv,
1678 vmg_cb_call2(w->cb_delete, w->opinfo | VMG_CB_CALL_GUARD, sv,
1684 if (SvRMAGICAL(sv) && !tied && !(action & (HV_FETCH_ISSTORE|HV_DELETE))) {
1685 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
1686 * mistaken for a tied hash by the rest of hv_common. It will be reset by
1687 * the op_ppaddr of a new fake op injected between the current and the next
1690 #if VMG_RESET_RMG_NEEDS_TRAMPOLINE
1694 PL_op = vmg_trampoline_bump(&MY_CXT.reset_rmg, sv, PL_op);
1696 #else /* !VMG_RESET_RMG_NEEDS_TRAMPOLINE */
1698 OP *nop = PL_op->op_next;
1701 if (nop && nop->op_ppaddr == vmg_pp_reset_rmg) {
1702 svop = (SVOP *) nop;
1704 NewOp(1101, svop, 1, SVOP);
1705 svop->op_type = OP_STUB;
1706 svop->op_ppaddr = vmg_pp_reset_rmg;
1707 svop->op_next = nop;
1709 svop->op_private = 0;
1711 PL_op->op_next = (OP *) svop;
1716 #endif /* VMG_RESET_RMG_NEEDS_TRAMPOLINE */
1724 #endif /* VMG_UVAR */
1726 /* --- Macros for the XS section ------------------------------------------- */
1729 # define VMG_CVOK(C) \
1730 ((CvISXSUB(C) ? (void *) CvXSUB(C) : (void *) CvROOT(C)) ? 1 : 0)
1732 # define VMG_CVOK(C) (CvROOT(C) || CvXSUB(C))
1735 #define VMG_CBOK(S) ((SvTYPE(S) == SVt_PVCV) ? VMG_CVOK(S) : SvOK(S))
1737 #define VMG_SET_CB(S, N) { \
1739 if (SvOK(cb) && SvROK(cb)) { \
1742 SvREFCNT_inc_simple_void(cb); \
1751 #define VMG_SET_SVT_CB(S, N) { \
1753 if (SvOK(cb) && SvROK(cb)) { \
1755 if (VMG_CBOK(cb)) { \
1756 t->svt_ ## N = vmg_svt_ ## N; \
1757 SvREFCNT_inc_simple_void(cb); \
1759 t->svt_ ## N = vmg_svt_ ## N ## _noop; \
1763 t->svt_ ## N = NULL; \
1769 /* --- XS ------------------------------------------------------------------ */
1771 MODULE = Variable::Magic PACKAGE = Variable::Magic
1781 for (c = OPc_NULL; c < OPc_MAX; ++c)
1782 MY_CXT.b__op_stashes[c] = NULL;
1785 MY_CXT.freed_tokens = NULL;
1787 /* XS doesn't like a blank line here */
1788 #if VMG_PROPAGATE_ERRSV_NEEDS_TRAMPOLINE
1789 vmg_trampoline_init(&MY_CXT.propagate_errsv, vmg_pp_propagate_errsv);
1791 #if VMG_RESET_RMG_NEEDS_TRAMPOLINE
1792 vmg_trampoline_init(&MY_CXT.reset_rmg, vmg_pp_reset_rmg);
1795 /* XS doesn't like a blank line here */
1797 MUTEX_INIT(&vmg_vtable_refcount_mutex);
1798 MUTEX_INIT(&vmg_op_name_init_mutex);
1801 stash = gv_stashpv(__PACKAGE__, 1);
1802 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1803 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1804 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1805 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1806 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1807 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1808 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_NOLEN",
1809 newSVuv(VMG_COMPAT_SCALAR_NOLEN));
1810 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1811 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1812 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID",
1813 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID));
1814 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1815 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1816 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1817 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1818 newCONSTSUB(stash, "VMG_COMPAT_HASH_DELETE_NOUVAR_VOID",
1819 newSVuv(VMG_COMPAT_HASH_DELETE_NOUVAR_VOID));
1820 newCONSTSUB(stash, "VMG_COMPAT_GLOB_GET", newSVuv(VMG_COMPAT_GLOB_GET));
1821 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1822 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1823 newCONSTSUB(stash, "VMG_FORKSAFE", newSVuv(VMG_FORKSAFE));
1824 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1825 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1834 U32 had_b__op_stash = 0;
1840 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1841 if (MY_CXT.b__op_stashes[c])
1842 had_b__op_stash |= (((U32) 1) << c);
1844 old_depth = MY_CXT.depth;
1848 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1849 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1850 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1852 MY_CXT.depth = old_depth;
1853 MY_CXT.freed_tokens = NULL;
1857 #endif /* VMG_THREADSAFE */
1864 SV *op_info, *copy_key;
1870 #endif /* MGf_LOCAL */
1873 #endif /* VMG_UVAR */
1874 ) { croak(vmg_wrongargnum); }
1877 w = vmg_wizard_alloc(SvOK(op_info) ? SvUV(op_info) : 0);
1878 t = vmg_vtable_vtbl(w->vtable);
1880 VMG_SET_CB(ST(i++), data);
1882 VMG_SET_SVT_CB(ST(i++), get);
1883 VMG_SET_SVT_CB(ST(i++), set);
1884 VMG_SET_SVT_CB(ST(i++), len);
1885 VMG_SET_SVT_CB(ST(i++), clear);
1886 VMG_SET_SVT_CB(ST(i++), free);
1887 VMG_SET_SVT_CB(ST(i++), copy);
1888 /* VMG_SET_SVT_CB(ST(i++), dup); */
1893 VMG_SET_SVT_CB(ST(i++), local);
1894 #endif /* MGf_LOCAL */
1896 VMG_SET_CB(ST(i++), fetch);
1897 VMG_SET_CB(ST(i++), store);
1898 VMG_SET_CB(ST(i++), exists);
1899 VMG_SET_CB(ST(i++), delete);
1902 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1903 w->uvar = SvTRUE(copy_key) ? 2 : 1;
1904 #endif /* VMG_UVAR */
1906 RETVAL = newRV_noinc(vmg_wizard_sv_new(w));
1910 SV *cast(SV *sv, SV *wiz, ...)
1911 PROTOTYPE: \[$@%&*]$@
1913 const vmg_wizard *w = NULL;
1922 wiz = SvRV_const(wiz);
1923 w = vmg_wizard_from_sv(wiz);
1926 croak(vmg_invalid_wiz);
1927 RETVAL = newSVuv(vmg_cast(SvRV(sv), w, wiz, args, i));
1932 getdata(SV *sv, SV *wiz)
1933 PROTOTYPE: \[$@%&*]$
1935 const vmg_wizard *w = NULL;
1939 w = vmg_wizard_from_sv(SvRV_const(wiz));
1941 croak(vmg_invalid_wiz);
1942 data = vmg_data_get(SvRV(sv), w);
1948 SV *dispell(SV *sv, SV *wiz)
1949 PROTOTYPE: \[$@%&*]$
1951 const vmg_wizard *w = NULL;
1954 w = vmg_wizard_from_sv(SvRV_const(wiz));
1956 croak(vmg_invalid_wiz);
1957 RETVAL = newSVuv(vmg_dispell(SvRV(sv), w));