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 /* Safe unless stated otherwise in Makefile.PL */
41 # define VMG_FORKSAFE 1
44 #ifndef VMG_MULTIPLICITY
45 # if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
46 # define VMG_MULTIPLICITY 1
48 # define VMG_MULTIPLICITY 0
51 #if VMG_MULTIPLICITY && !defined(tTHX)
52 # define tTHX PerlInterpreter*
55 #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))
56 # define VMG_THREADSAFE 1
58 # define MY_CXT_CLONE \
60 my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
61 Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
62 sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
65 # define VMG_THREADSAFE 0
67 # define dMY_CXT dNOOP
69 # define MY_CXT vmg_globaldata
71 # define START_MY_CXT STATIC my_cxt_t MY_CXT;
73 # define MY_CXT_INIT NOOP
75 # define MY_CXT_CLONE NOOP
80 STATIC SV *vmg_clone(pTHX_ SV *sv, tTHX owner) {
81 #define vmg_clone(P, O) vmg_clone(aTHX_ (P), (O))
84 param.stashes = NULL; /* don't need it unless sv is a PVHV */
86 param.proto_perl = owner;
88 return SvREFCNT_inc(sv_dup(sv, ¶m));
91 #endif /* VMG_THREADSAFE */
93 /* --- Compatibility ------------------------------------------------------- */
96 # define Newx(v, n, c) New(0, v, n, c)
100 # define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
104 # define SvRV_const(sv) SvRV((SV *) sv)
107 #ifndef SvREFCNT_inc_simple_void
108 # define SvREFCNT_inc_simple_void(sv) SvREFCNT_inc(sv)
112 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
115 #ifndef PERL_MAGIC_ext
116 # define PERL_MAGIC_ext '~'
119 #ifndef PERL_MAGIC_tied
120 # define PERL_MAGIC_tied 'P'
135 #ifndef IN_PERL_COMPILETIME
136 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
139 /* uvar magic and Hash::Util::FieldHash were commited with 28419, but we only
140 * enable them on 5.10 */
141 #if VMG_HAS_PERL(5, 10, 0)
147 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160, partially
148 * reverted to dev-5.11 as 9cdcb38b */
149 #if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
150 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
151 /* This branch should only apply for perls before the official 5.11.0 release.
152 * Makefile.PL takes care of the higher ones. */
153 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
155 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
156 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 1
159 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
160 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
162 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
163 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 0
167 /* Applied to dev-5.11 as 34908 */
168 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908) || VMG_HAS_PERL(5, 12, 0)
169 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
171 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
174 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
175 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
176 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
178 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
181 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969) || VMG_HAS_PERL(5, 12, 0)
182 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
184 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
187 /* ... Bug-free mg_magical ................................................. */
189 /* See the discussion at http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html. This version is specialized to our needs. */
193 STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
194 #define vmg_sv_magicuvar(S, U, L) vmg_sv_magicuvar(aTHX_ (S), (U), (L))
196 sv_magic(sv, NULL, PERL_MAGIC_uvar, uf, len);
197 /* uvar magic has set and get magic, hence this has set SVs_GMG and SVs_SMG. */
198 if ((mg = SvMAGIC(sv))) {
201 const MGVTBL* const vtbl = mg->mg_virtual;
203 if (vtbl->svt_clear) {
208 } while ((mg = mg->mg_moremagic));
212 #endif /* VMG_UVAR */
214 /* ... Safe version of call_sv() ........................................... */
216 #define VMG_SAVE_LAST_CX (!VMG_HAS_PERL(5, 8, 4) || VMG_HAS_PERL(5, 9, 5))
218 STATIC I32 vmg_call_sv(pTHX_ SV *sv, I32 flags, I32 destructor) {
219 #define vmg_call_sv(S, F, D) vmg_call_sv(aTHX_ (S), (F), (D))
220 I32 ret, cxix = 0, in_eval = 0;
222 PERL_CONTEXT saved_cx;
231 if (cxstack_ix < cxstack_max) {
232 cxix = cxstack_ix + 1;
233 if (destructor && CxTYPE(cxstack + cxix) == CXt_EVAL)
238 /* The last popped context will be reused by call_sv(), but our callers may
239 * still need its previous value. Back it up so that it isn't clobbered. */
240 saved_cx = cxstack[cxix];
243 ret = call_sv(sv, flags | G_EVAL);
246 cxstack[cxix] = saved_cx;
251 sv_setsv(old_err, ERRSV);
255 if (IN_PERL_COMPILETIME) {
258 sv_catsv(PL_errors, ERRSV);
260 Perl_warn(aTHX_ "%s", SvPV_nolen(ERRSV));
263 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
265 ++PL_parser->error_count;
266 #elif defined(PL_error_count)
283 /* --- Stolen chunk of B --------------------------------------------------- */
301 STATIC const char *const vmg_opclassnames[] = {
316 STATIC opclass vmg_opclass(const OP *o) {
323 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
325 if (o->op_type == OP_SASSIGN)
326 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
328 if (o->op_type == OP_AELEMFAST) {
329 if (o->op_flags & OPf_SPECIAL)
340 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
344 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
361 case OA_PVOP_OR_SVOP:
362 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
367 case OA_BASEOP_OR_UNOP:
368 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
370 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
372 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
374 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
377 if (o->op_flags & OPf_STACKED)
379 else if (o->op_flags & OPf_SPECIAL)
388 /* --- Error messages ------------------------------------------------------ */
390 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
391 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
392 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
394 /* --- Signatures ---------------------------------------------------------- */
396 #define SIG_WZO ((U16) (0x3891))
397 #define SIG_WIZ ((U16) (0x3892))
399 /* --- MGWIZ structure ----------------------------------------------------- */
408 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
411 #endif /* MGf_COPY */
417 #endif /* MGf_LOCAL */
419 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
420 #endif /* VMG_UVAR */
424 #endif /* VMG_MULTIPLICITY */
427 STATIC void vmg_mgwiz_free(pTHX_ MGWIZ *w) {
428 #define vmg_mgwiz_free(W) vmg_mgwiz_free(aTHX_ (W))
432 if (w->cb_data) SvREFCNT_dec(w->cb_data);
433 if (w->cb_get) SvREFCNT_dec(w->cb_get);
434 if (w->cb_set) SvREFCNT_dec(w->cb_set);
435 if (w->cb_len) SvREFCNT_dec(w->cb_len);
436 if (w->cb_clear) SvREFCNT_dec(w->cb_clear);
437 if (w->cb_free) SvREFCNT_dec(w->cb_free);
439 if (w->cb_copy) SvREFCNT_dec(w->cb_copy);
440 #endif /* MGf_COPY */
442 if (w->cb_dup) SvREFCNT_dec(w->cb_dup);
445 if (w->cb_local) SvREFCNT_dec(w->cb_local);
446 #endif /* MGf_LOCAL */
448 if (w->cb_fetch) SvREFCNT_dec(w->cb_fetch);
449 if (w->cb_store) SvREFCNT_dec(w->cb_store);
450 if (w->cb_exists) SvREFCNT_dec(w->cb_exists);
451 if (w->cb_delete) SvREFCNT_dec(w->cb_delete);
452 #endif /* VMG_UVAR */
462 #define VMG_CLONE_CB(N) \
463 z->cb_ ## N = (w->cb_ ## N) ? vmg_clone(w->cb_ ## N, w->owner) \
466 STATIC MGWIZ *vmg_mgwiz_clone(pTHX_ const MGWIZ *w) {
467 #define vmg_mgwiz_clone(W) vmg_mgwiz_clone(aTHX_ (W))
475 Copy(w->vtbl, t, 1, MGVTBL);
481 z->opinfo = w->opinfo;
491 #endif /* MGf_COPY */
497 #endif /* MGf_LOCAL */
501 VMG_CLONE_CB(exists);
502 VMG_CLONE_CB(delete);
503 #endif /* VMG_UVAR */
510 #endif /* VMG_THREADSAFE */
512 /* --- Context-safe global data -------------------------------------------- */
516 #define PTABLE_NAME ptable
517 #define PTABLE_VAL_FREE(V) vmg_mgwiz_free(V)
526 #define ptable_store(T, K, V) ptable_store(aTHX_ (T), (K), (V))
527 #define ptable_clear(T) ptable_clear(aTHX_ (T))
528 #define ptable_free(T) ptable_free(aTHX_ (T))
530 #endif /* VMG_THREADSAFE */
532 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
539 HV *b__op_stashes[OPc_MAX];
546 STATIC void vmg_ptable_clone(pTHX_ ptable_ent *ent, void *ud_) {
550 if (ud->owner == aTHX)
553 w = vmg_mgwiz_clone(ent->val);
555 ptable_store(ud->wizards, ent->key, w);
558 #endif /* VMG_THREADSAFE */
560 /* --- Wizard objects ------------------------------------------------------ */
562 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg);
564 STATIC MGVTBL vmg_wizard_vtbl = {
569 vmg_wizard_free, /* free */
572 #endif /* MGf_COPY */
578 #endif /* MGf_LOCAL */
581 /* ... Wizard constructor .................................................. */
583 STATIC SV *vmg_wizard_new(pTHX_ const MGWIZ *w) {
584 #define vmg_wizard_new(W) vmg_wizard_new(aTHX_ (W))
585 SV *wiz = newSVuv(PTR2IV(w));
588 MAGIC *mg = sv_magicext(wiz, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
589 mg->mg_private = SIG_WZO;
596 STATIC const SV *vmg_wizard_validate(pTHX_ const SV *wiz) {
597 #define vmg_wizard_validate(W) vmg_wizard_validate(aTHX_ (W))
599 wiz = SvRV_const(wiz);
604 croak(vmg_invalid_wiz);
609 #define vmg_wizard_id(W) SvIVX((const SV *) (W))
610 #define vmg_wizard_main_mgwiz(W) INT2PTR(const MGWIZ *, vmg_wizard_id(W))
612 /* ... Wizard destructor ................................................... */
614 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg) {
617 if (PL_dirty) /* During global destruction, the context is already freed */
620 w = (MGWIZ *) vmg_wizard_main_mgwiz(sv);
625 ptable_store(MY_CXT.wizards, w, NULL);
627 #else /* VMG_THREADSAFE */
629 #endif /* !VMG_THREADSAFE */
636 STATIC const MGWIZ *vmg_wizard_mgwiz(pTHX_ const SV *wiz) {
637 #define vmg_wizard_mgwiz(W) vmg_wizard_mgwiz(aTHX_ ((const SV *) (W)))
640 w = vmg_wizard_main_mgwiz(wiz);
641 if (w->owner == aTHX)
646 return ptable_fetch(MY_CXT.wizards, w);
650 #else /* VMG_THREADSAFE */
652 #define vmg_wizard_mgwiz(W) vmg_wizard_main_mgwiz(W)
654 #endif /* !VMG_THREADSAFE */
656 /* --- User-level functions implementation --------------------------------- */
658 STATIC const MAGIC *vmg_find(const SV *sv, const SV *wiz) {
659 const MAGIC *mg, *moremagic;
662 if (SvTYPE(sv) < SVt_PVMG)
665 wid = vmg_wizard_id(wiz);
666 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
667 moremagic = mg->mg_moremagic;
668 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
669 IV zid = vmg_wizard_id(mg->mg_ptr);
678 /* ... Construct private data .............................................. */
680 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, SV **args, I32 items) {
681 #define vmg_data_new(C, S, A, I) vmg_data_new(aTHX_ (C), (S), (A), (I))
691 EXTEND(SP, items + 1);
692 PUSHs(sv_2mortal(newRV_inc(sv)));
693 for (i = 0; i < items; ++i)
697 vmg_call_sv(ctor, G_SCALAR, 0);
701 #if VMG_HAS_PERL(5, 8, 3)
702 SvREFCNT_inc_simple_void(nsv); /* Or it will be destroyed in FREETMPS */
704 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
714 STATIC SV *vmg_data_get(pTHX_ SV *sv, const SV *wiz) {
715 #define vmg_data_get(S, W) vmg_data_get(aTHX_ (S), (W))
716 const MAGIC *mg = vmg_find(sv, wiz);
717 return mg ? mg->mg_obj : NULL;
720 /* ... Magic cast/dispell .................................................. */
723 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
725 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
727 prevmagic->mg_moremagic = moremagic;
729 SvMAGIC_set(sv, moremagic);
731 mg->mg_moremagic = NULL;
732 Safefree(mg->mg_ptr);
735 #endif /* VMG_UVAR */
737 STATIC UV vmg_cast(pTHX_ SV *sv, const SV *wiz, SV **args, I32 items) {
738 #define vmg_cast(S, W, A, I) vmg_cast(aTHX_ (S), (W), (A), (I))
739 MAGIC *mg, *moremagic = NULL;
744 if (vmg_find(sv, wiz))
747 w = vmg_wizard_mgwiz(wiz);
748 oldgmg = SvGMAGICAL(sv);
750 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args, items) : NULL;
751 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
753 mg->mg_private = SIG_WIZ;
756 mg->mg_flags |= MGf_COPY;
757 #endif /* MGf_COPY */
760 mg->mg_flags |= MGf_DUP;
764 mg->mg_flags |= MGf_LOCAL;
765 #endif /* MGf_LOCAL */
767 if (SvTYPE(sv) < SVt_PVHV)
770 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
771 * magic is actually never called for them. If the GMAGICAL flag was off before
772 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
773 * now on, then this wizard has get magic. Hence we can work around the
774 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
775 * has uvar callbacks, it will be turned back on later. */
776 if (!oldgmg && SvGMAGICAL(sv))
784 uf[0].uf_val = vmg_svt_val;
791 /* One uvar magic in the chain is enough. */
792 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
793 moremagic = mg->mg_moremagic;
794 if (mg->mg_type == PERL_MAGIC_uvar)
798 if (mg) { /* Found another uvar magic. */
799 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
800 if (olduf->uf_val == vmg_svt_val) {
801 /* It's our uvar magic, nothing to do. oldgmg was true. */
804 /* It's another uvar magic, backup it and replace it by ours. */
806 vmg_uvar_del(sv, prevmagic, mg, moremagic);
810 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
811 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
812 * handled by our uvar callback. */
814 #endif /* VMG_UVAR */
820 STATIC UV vmg_dispell(pTHX_ SV *sv, const SV *wiz) {
821 #define vmg_dispell(S, W) vmg_dispell(aTHX_ (S), (W))
824 #endif /* VMG_UVAR */
825 MAGIC *mg, *prevmagic, *moremagic = NULL;
826 IV wid = vmg_wizard_id(wiz);
828 if (SvTYPE(sv) < SVt_PVMG)
831 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
832 moremagic = mg->mg_moremagic;
833 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
834 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
835 IV zid = vmg_wizard_id(mg->mg_ptr);
838 /* If the current has no uvar, short-circuit uvar deletion. */
839 uvars = z->uvar ? (uvars + 1) : 0;
840 #endif /* VMG_UVAR */
843 } else if (z->uvar) {
845 /* We can't break here since we need to find the ext magic to delete. */
846 #endif /* VMG_UVAR */
854 prevmagic->mg_moremagic = moremagic;
856 SvMAGIC_set(sv, moremagic);
858 mg->mg_moremagic = NULL;
860 /* Destroy private data */
861 if (mg->mg_obj != sv)
862 SvREFCNT_dec(mg->mg_obj);
863 /* Unreference the wizard */
864 SvREFCNT_dec((SV *) mg->mg_ptr);
868 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
869 /* mg was the first ext magic in the chain that had uvar */
871 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
872 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
873 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
883 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
884 moremagic = mg->mg_moremagic;
885 if (mg->mg_type == PERL_MAGIC_uvar)
889 uf = (struct ufuncs *) mg->mg_ptr;
890 /* assert(uf->uf_val == vmg_svt_val); */
891 if (uf[1].uf_val || uf[1].uf_set) {
892 /* Revert the original uvar magic. */
894 Renew(uf, 1, struct ufuncs);
895 mg->mg_ptr = (char *) uf;
896 mg->mg_len = sizeof(struct ufuncs);
898 /* Remove the uvar magic. */
899 vmg_uvar_del(sv, prevmagic, mg, moremagic);
903 #endif /* VMG_UVAR */
908 /* ... OP info ............................................................. */
910 #define VMG_OP_INFO_NAME 1
911 #define VMG_OP_INFO_OBJECT 2
914 STATIC perl_mutex vmg_op_name_init_mutex;
917 STATIC U32 vmg_op_name_init = 0;
918 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
920 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
921 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
923 case VMG_OP_INFO_NAME:
925 MUTEX_LOCK(&vmg_op_name_init_mutex);
927 if (!vmg_op_name_init) {
929 for (t = 0; t < OP_max; ++t)
930 vmg_op_name_len[t] = strlen(PL_op_name[t]);
931 vmg_op_name_init = 1;
934 MUTEX_UNLOCK(&vmg_op_name_init_mutex);
937 case VMG_OP_INFO_OBJECT: {
939 if (!MY_CXT.b__op_stashes[0]) {
942 for (c = OPc_NULL; c < OPc_MAX; ++c)
943 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
952 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
953 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
958 case VMG_OP_INFO_NAME: {
959 OPCODE t = PL_op->op_type;
960 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
962 case VMG_OP_INFO_OBJECT: {
964 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
965 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
974 /* ... svt callbacks ....................................................... */
976 #define VMG_CB_CALL_ARGS_MASK 15
977 #define VMG_CB_CALL_ARGS_SHIFT 4
978 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
980 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
983 unsigned int i, args, opinfo;
988 args = flags & VMG_CB_CALL_ARGS_MASK;
989 flags >>= VMG_CB_CALL_ARGS_SHIFT;
990 opinfo = flags & VMG_CB_CALL_OPINFO;
996 EXTEND(SP, args + 1);
997 PUSHs(sv_2mortal(newRV_inc(sv)));
999 for (i = 0; i < args; ++i) {
1000 SV *sva = va_arg(ap, SV *);
1001 PUSHs(sva ? sva : &PL_sv_undef);
1005 XPUSHs(vmg_op_info(opinfo));
1008 vmg_call_sv(cb, G_SCALAR, 0);
1013 ret = (int) SvIV(svr);
1022 #define VMG_CB_FLAGS(OI, A) \
1023 ((((unsigned int) (OI)) << VMG_CB_CALL_ARGS_SHIFT) | (A))
1025 #define vmg_cb_call1(I, OI, S, A1) \
1026 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 1), (S), (A1))
1027 #define vmg_cb_call2(I, OI, S, A1, A2) \
1028 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 2), (S), (A1), (A2))
1029 #define vmg_cb_call3(I, OI, S, A1, A2, A3) \
1030 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 3), (S), (A1), (A2), (A3))
1032 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
1033 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1034 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
1037 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
1038 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1039 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
1042 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
1043 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1044 unsigned int opinfo = w->opinfo;
1047 svtype t = SvTYPE(sv);
1056 PUSHs(sv_2mortal(newRV_inc(sv)));
1057 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1060 #if VMG_HAS_PERL(5, 9, 3)
1061 const U8 *s = SvPV_const(sv, l);
1063 U8 *s = SvPV(sv, l);
1066 len = utf8_length(s, s + l);
1070 } else if (t == SVt_PVAV) {
1071 len = av_len((AV *) sv) + 1;
1075 PUSHs(&PL_sv_undef);
1078 XPUSHs(vmg_op_info(opinfo));
1081 vmg_call_sv(w->cb_len, G_SCALAR, 0);
1085 ret = SvOK(svr) ? (U32) SvUV(svr) : len;
1096 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
1097 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1098 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
1101 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
1108 /* Don't even bother if we are in global destruction - the wizard is prisoner
1109 * of circular references and we are way beyond user realm */
1113 w = vmg_wizard_mgwiz(mg->mg_ptr);
1115 /* So that it survives the temp cleanup below */
1116 SvREFCNT_inc_simple_void(sv);
1118 #if !(VMG_HAS_PERL_MAINT(5, 11, 0, 32686) || VMG_HAS_PERL(5, 12, 0))
1119 /* The previous magic tokens were freed but the magic chain wasn't updated, so
1120 * if you access the sv from the callback the old deleted magics will trigger
1121 * and cause memory misreads. Change 32686 solved it that way : */
1122 SvMAGIC_set(sv, mg);
1130 PUSHs(sv_2mortal(newRV_inc(sv)));
1131 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1133 XPUSHs(vmg_op_info(w->opinfo));
1136 vmg_call_sv(w->cb_free, G_SCALAR, 1);
1141 ret = (int) SvIV(svr);
1147 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
1148 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
1151 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
1152 * mg->mg_ptr reference count */
1157 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
1158 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256) || VMG_HAS_PERL(5, 12, 0)
1165 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1168 if (keylen == HEf_SVKEY) {
1171 keysv = newSVpvn(key, keylen);
1174 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
1176 if (keylen != HEf_SVKEY) {
1177 SvREFCNT_dec(keysv);
1182 #endif /* MGf_COPY */
1185 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
1188 #endif /* MGf_DUP */
1191 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
1192 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1193 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
1195 #endif /* MGf_LOCAL */
1198 STATIC OP *vmg_pp_resetuvar(pTHX) {
1199 SvRMAGICAL_on(cSVOP_sv);
1203 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
1206 SV *key = NULL, *newkey = NULL;
1209 umg = mg_find(sv, PERL_MAGIC_uvar);
1210 /* umg can't be NULL or we wouldn't be there. */
1212 uf = (struct ufuncs *) umg->mg_ptr;
1215 uf[1].uf_val(aTHX_ action, sv);
1217 uf[1].uf_set(aTHX_ action, sv);
1219 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
1220 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
1222 switch (mg->mg_type) {
1223 case PERL_MAGIC_ext:
1225 case PERL_MAGIC_tied:
1231 if (mg->mg_private != SIG_WIZ) continue;
1232 w = vmg_wizard_mgwiz(mg->mg_ptr);
1238 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
1243 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
1245 case HV_FETCH_ISSTORE:
1246 case HV_FETCH_LVALUE:
1247 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
1249 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
1251 case HV_FETCH_ISEXISTS:
1253 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
1257 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
1262 if (SvRMAGICAL(sv) && !tied) {
1263 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
1264 * mistaken for a tied hash by the rest of hv_common. It will be reset by
1265 * the op_ppaddr of a new fake op injected between the current and the next
1268 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
1270 NewOp(1101, svop, 1, SVOP);
1271 svop->op_type = OP_STUB;
1272 svop->op_ppaddr = vmg_pp_resetuvar;
1273 svop->op_next = o->op_next;
1276 o->op_next = (OP *) svop;
1283 #endif /* VMG_UVAR */
1285 /* --- Macros for the XS section ------------------------------------------- */
1287 #define VMG_SET_CB(S, N) \
1289 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? SvREFCNT_inc(SvRV(cb)) : NULL;
1291 #define VMG_SET_SVT_CB(S, N) \
1293 if (SvOK(cb) && SvROK(cb)) { \
1294 t->svt_ ## N = vmg_svt_ ## N; \
1295 w->cb_ ## N = SvREFCNT_inc(SvRV(cb)); \
1297 t->svt_ ## N = NULL; \
1298 w->cb_ ## N = NULL; \
1303 STATIC void vmg_cleanup(pTHX_ void *ud) {
1306 ptable_free(MY_CXT.wizards);
1307 MY_CXT.wizards = NULL;
1310 #endif /* VMG_THREADSAFE */
1312 /* --- XS ------------------------------------------------------------------ */
1314 MODULE = Variable::Magic PACKAGE = Variable::Magic
1324 MY_CXT.wizards = ptable_new();
1325 MY_CXT.owner = aTHX;
1327 MY_CXT.b__op_stashes[0] = NULL;
1329 MUTEX_INIT(&vmg_op_name_init_mutex);
1330 call_atexit(vmg_cleanup, NULL);
1333 stash = gv_stashpv(__PACKAGE__, 1);
1334 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1335 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1336 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1337 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1338 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1339 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1340 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID",
1341 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID));
1342 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1343 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1344 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1345 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1346 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1347 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1348 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1349 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1350 newCONSTSUB(stash, "VMG_FORKSAFE", newSVuv(VMG_FORKSAFE));
1351 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1352 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1362 U32 had_b__op_stash = 0;
1369 ud.wizards = t = ptable_new();
1370 ud.owner = MY_CXT.owner;
1371 ptable_walk(MY_CXT.wizards, vmg_ptable_clone, &ud);
1373 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1374 if (MY_CXT.b__op_stashes[c])
1375 had_b__op_stash |= (((U32) 1) << c);
1381 MY_CXT.owner = aTHX;
1382 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1383 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1384 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1389 #endif /* VMG_THREADSAFE */
1405 #endif /* MGf_COPY */
1408 #endif /* MGf_DUP */
1411 #endif /* MGf_LOCAL */
1414 #endif /* VMG_UVAR */
1415 ) { croak(vmg_wrongargnum); }
1420 VMG_SET_CB(ST(i++), data);
1423 opinfo = SvOK(cb) ? SvUV(cb) : 0;
1424 w->opinfo = (U8) ((opinfo < 255) ? opinfo : 255);
1426 vmg_op_info_init(w->opinfo);
1428 VMG_SET_SVT_CB(ST(i++), get);
1429 VMG_SET_SVT_CB(ST(i++), set);
1430 VMG_SET_SVT_CB(ST(i++), len);
1431 VMG_SET_SVT_CB(ST(i++), clear);
1432 VMG_SET_SVT_CB(ST(i++), free);
1434 VMG_SET_SVT_CB(ST(i++), copy);
1435 #endif /* MGf_COPY */
1437 /* VMG_SET_SVT_CB(ST(i++), dup); */
1441 #endif /* MGf_DUP */
1443 VMG_SET_SVT_CB(ST(i++), local);
1444 #endif /* MGf_LOCAL */
1446 VMG_SET_CB(ST(i++), fetch);
1447 VMG_SET_CB(ST(i++), store);
1448 VMG_SET_CB(ST(i++), exists);
1449 VMG_SET_CB(ST(i++), delete);
1451 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1452 w->uvar = SvTRUE(cb) ? 2 : 1;
1455 #endif /* VMG_UVAR */
1456 #if VMG_MULTIPLICITY
1458 #endif /* VMG_MULTIPLICITY */
1461 ptable_store(MY_CXT.wizards, w, w);
1462 #endif /* VMG_THREADSAFE */
1464 RETVAL = newRV_noinc(vmg_wizard_new(w));
1468 SV *cast(SV *sv, SV *wiz, ...)
1469 PROTOTYPE: \[$@%&*]$@
1478 RETVAL = newSVuv(vmg_cast(SvRV(sv), vmg_wizard_validate(wiz), args, i));
1483 getdata(SV *sv, SV *wiz)
1484 PROTOTYPE: \[$@%&*]$
1488 data = vmg_data_get(SvRV(sv), vmg_wizard_validate(wiz));
1494 SV *dispell(SV *sv, SV *wiz)
1495 PROTOTYPE: \[$@%&*]$
1497 RETVAL = newSVuv(vmg_dispell(SvRV(sv), vmg_wizard_validate(wiz)));