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 mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
108 # define SvPV_const SvPV
111 #ifndef PERL_MAGIC_ext
112 # define PERL_MAGIC_ext '~'
115 #ifndef PERL_MAGIC_tied
116 # define PERL_MAGIC_tied 'P'
131 #ifndef IN_PERL_COMPILETIME
132 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
135 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
136 # ifndef PL_error_count
137 # define PL_error_count PL_parser->error_count
140 # ifndef PL_error_count
141 # define PL_error_count PL_Ierror_count
145 /* uvar magic and Hash::Util::FieldHash were commited with 28419, but only
146 * enable it on 5.10 */
147 #if VMG_HAS_PERL(5, 10, 0)
153 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160, partially
154 * reverted to dev-5.11 as 9cdcb38b */
155 #if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
156 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
157 /* This branch should only apply for perls before the official 5.11.0 release.
158 * Makefile.PL takes care of the higher ones. */
159 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
161 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
162 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 1
165 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
166 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
168 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
169 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 0
173 /* Applied to dev-5.11 as 34908 */
174 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908)
175 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
177 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
180 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
181 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
182 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
184 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
187 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969)
188 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
190 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
195 /* Bug-free mg_magical - see http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html - but specialized to our needs. */
196 STATIC void vmg_sv_magicuvar(pTHX_ SV *sv, const char *uf, I32 len) {
197 #define vmg_sv_magicuvar(S, U, L) vmg_sv_magicuvar(aTHX_ (S), (U), (L))
199 sv_magic(sv, NULL, PERL_MAGIC_uvar, uf, len);
200 /* uvar magic has set and get magic, hence this has set SVs_GMG and SVs_SMG. */
201 if ((mg = SvMAGIC(sv))) {
204 const MGVTBL* const vtbl = mg->mg_virtual;
206 if (vtbl->svt_clear) {
211 } while ((mg = mg->mg_moremagic));
215 #endif /* VMG_UVAR */
217 /* --- Stolen chunk of B --------------------------------------------------- */
235 STATIC const char *const vmg_opclassnames[] = {
250 STATIC opclass vmg_opclass(const OP *o) {
257 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
259 if (o->op_type == OP_SASSIGN)
260 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
262 if (o->op_type == OP_AELEMFAST) {
263 if (o->op_flags & OPf_SPECIAL)
274 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
278 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
295 case OA_PVOP_OR_SVOP:
296 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
301 case OA_BASEOP_OR_UNOP:
302 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
304 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
306 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
308 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
311 if (o->op_flags & OPf_STACKED)
313 else if (o->op_flags & OPf_SPECIAL)
322 /* --- Error messages ------------------------------------------------------ */
324 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
325 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
326 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
328 /* --- Signatures ---------------------------------------------------------- */
330 #define SIG_WZO ((U16) (0x3891))
331 #define SIG_WIZ ((U16) (0x3892))
333 /* --- MGWIZ structure ----------------------------------------------------- */
342 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
345 #endif /* MGf_COPY */
351 #endif /* MGf_LOCAL */
353 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
354 #endif /* VMG_UVAR */
358 #endif /* VMG_MULTIPLICITY */
361 STATIC void vmg_mgwiz_free(pTHX_ MGWIZ *w) {
362 #define vmg_mgwiz_free(W) vmg_mgwiz_free(aTHX_ (W))
366 if (w->cb_data) SvREFCNT_dec(w->cb_data);
367 if (w->cb_get) SvREFCNT_dec(w->cb_get);
368 if (w->cb_set) SvREFCNT_dec(w->cb_set);
369 if (w->cb_len) SvREFCNT_dec(w->cb_len);
370 if (w->cb_clear) SvREFCNT_dec(w->cb_clear);
371 if (w->cb_free) SvREFCNT_dec(w->cb_free);
373 if (w->cb_copy) SvREFCNT_dec(w->cb_copy);
374 #endif /* MGf_COPY */
376 if (w->cb_dup) SvREFCNT_dec(w->cb_dup);
379 if (w->cb_local) SvREFCNT_dec(w->cb_local);
380 #endif /* MGf_LOCAL */
382 if (w->cb_fetch) SvREFCNT_dec(w->cb_fetch);
383 if (w->cb_store) SvREFCNT_dec(w->cb_store);
384 if (w->cb_exists) SvREFCNT_dec(w->cb_exists);
385 if (w->cb_delete) SvREFCNT_dec(w->cb_delete);
386 #endif /* VMG_UVAR */
396 #define VMG_CLONE_CB(N) \
397 z->cb_ ## N = (w->cb_ ## N) ? vmg_clone(w->cb_ ## N, w->owner) \
400 STATIC MGWIZ *vmg_mgwiz_clone(pTHX_ const MGWIZ *w) {
401 #define vmg_mgwiz_clone(W) vmg_mgwiz_clone(aTHX_ (W))
409 Copy(w->vtbl, t, 1, MGVTBL);
415 z->opinfo = w->opinfo;
425 #endif /* MGf_COPY */
431 #endif /* MGf_LOCAL */
435 VMG_CLONE_CB(exists);
436 VMG_CLONE_CB(delete);
437 #endif /* VMG_UVAR */
444 #endif /* VMG_THREADSAFE */
446 /* --- Context-safe global data -------------------------------------------- */
450 #define PTABLE_NAME ptable
451 #define PTABLE_VAL_FREE(V) vmg_mgwiz_free(V)
460 #define ptable_store(T, K, V) ptable_store(aTHX_ (T), (K), (V))
461 #define ptable_clear(T) ptable_clear(aTHX_ (T))
462 #define ptable_free(T) ptable_free(aTHX_ (T))
464 #endif /* VMG_THREADSAFE */
466 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
473 HV *b__op_stashes[OPc_MAX];
480 STATIC void vmg_ptable_clone(pTHX_ ptable_ent *ent, void *ud_) {
484 if (ud->owner == aTHX)
487 w = vmg_mgwiz_clone(ent->val);
489 ptable_store(ud->wizards, ent->key, w);
492 #endif /* VMG_THREADSAFE */
494 /* --- Wizard objects ------------------------------------------------------ */
496 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg);
498 STATIC MGVTBL vmg_wizard_vtbl = {
503 vmg_wizard_free, /* free */
506 #endif /* MGf_COPY */
512 #endif /* MGf_LOCAL */
515 /* ... Wizard constructor .................................................. */
517 STATIC SV *vmg_wizard_new(pTHX_ const MGWIZ *w) {
518 #define vmg_wizard_new(W) vmg_wizard_new(aTHX_ (W))
519 SV *wiz = newSVuv(PTR2IV(w));
522 MAGIC *mg = sv_magicext(wiz, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
523 mg->mg_private = SIG_WZO;
530 STATIC const SV *vmg_wizard_validate(pTHX_ const SV *wiz) {
531 #define vmg_wizard_validate(W) vmg_wizard_validate(aTHX_ (W))
538 croak(vmg_invalid_wiz);
541 #define vmg_wizard_id(W) SvIVX((const SV *) (W))
542 #define vmg_wizard_main_mgwiz(W) INT2PTR(const MGWIZ *, vmg_wizard_id(W))
544 /* ... Wizard destructor ................................................... */
546 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg) {
549 if (PL_dirty) /* During global destruction, the context is already freed */
552 w = (MGWIZ *) vmg_wizard_main_mgwiz(sv);
557 ptable_store(MY_CXT.wizards, w, NULL);
559 #else /* VMG_THREADSAFE */
561 #endif /* !VMG_THREADSAFE */
568 STATIC const MGWIZ *vmg_wizard_mgwiz(pTHX_ const SV *wiz) {
569 #define vmg_wizard_mgwiz(W) vmg_wizard_mgwiz(aTHX_ ((const SV *) (W)))
572 w = vmg_wizard_main_mgwiz(wiz);
573 if (w->owner == aTHX)
578 return ptable_fetch(MY_CXT.wizards, w);
582 #else /* VMG_THREADSAFE */
584 #define vmg_wizard_mgwiz(W) vmg_wizard_main_mgwiz(W)
586 #endif /* !VMG_THREADSAFE */
588 /* --- User-level functions implementation --------------------------------- */
590 STATIC const MAGIC *vmg_find(const SV *sv, const SV *wiz) {
591 const MAGIC *mg, *moremagic;
594 if (SvTYPE(sv) < SVt_PVMG)
597 wid = vmg_wizard_id(wiz);
598 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
599 moremagic = mg->mg_moremagic;
600 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
601 UV zid = vmg_wizard_id(mg->mg_ptr);
610 /* ... Construct private data .............................................. */
612 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, AV *args) {
613 #define vmg_data_new(C, S, A) vmg_data_new(aTHX_ (C), (S), (A))
615 I32 i, alen = (args == NULL) ? 0 : av_len(args);
623 EXTEND(SP, alen + 1);
624 PUSHs(sv_2mortal(newRV_inc(sv)));
625 for (i = 0; i < alen; ++i)
626 PUSHs(*av_fetch(args, i, 0));
629 call_sv(ctor, G_SCALAR);
633 #if VMG_HAS_PERL(5, 8, 3)
634 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
636 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
646 STATIC SV *vmg_data_get(pTHX_ SV *sv, const SV *wiz) {
647 #define vmg_data_get(S, W) vmg_data_get(aTHX_ (S), (W))
648 const MAGIC *mg = vmg_find(sv, wiz);
649 return mg ? mg->mg_obj : NULL;
652 /* ... Magic cast/dispell .................................................. */
655 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
657 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
659 prevmagic->mg_moremagic = moremagic;
661 SvMAGIC_set(sv, moremagic);
663 mg->mg_moremagic = NULL;
664 Safefree(mg->mg_ptr);
667 #endif /* VMG_UVAR */
669 STATIC UV vmg_cast(pTHX_ SV *sv, const SV *wiz, AV *args) {
670 #define vmg_cast(S, W, A) vmg_cast(aTHX_ (S), (W), (A))
671 MAGIC *mg, *moremagic = NULL;
676 if (vmg_find(sv, wiz))
679 w = vmg_wizard_mgwiz(wiz);
680 oldgmg = SvGMAGICAL(sv);
682 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args) : NULL;
683 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl, (const char *) wiz, HEf_SVKEY);
684 mg->mg_private = SIG_WIZ;
687 mg->mg_flags |= MGf_COPY;
688 #endif /* MGf_COPY */
691 mg->mg_flags |= MGf_DUP;
695 mg->mg_flags |= MGf_LOCAL;
696 #endif /* MGf_LOCAL */
698 if (SvTYPE(sv) < SVt_PVHV)
701 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
702 * magic is actually never called for them. If the GMAGICAL flag was off before
703 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
704 * now on, then this wizard has get magic. Hence we can work around the
705 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
706 * has uvar callbacks, it will be turned back on later. */
707 if (!oldgmg && SvGMAGICAL(sv))
715 uf[0].uf_val = vmg_svt_val;
722 /* One uvar magic in the chain is enough. */
723 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
724 moremagic = mg->mg_moremagic;
725 if (mg->mg_type == PERL_MAGIC_uvar)
729 if (mg) { /* Found another uvar magic. */
730 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
731 if (olduf->uf_val == vmg_svt_val) {
732 /* It's our uvar magic, nothing to do. oldgmg was true. */
735 /* It's another uvar magic, backup it and replace it by ours. */
737 vmg_uvar_del(sv, prevmagic, mg, moremagic);
741 vmg_sv_magicuvar(sv, (const char *) &uf, sizeof(uf));
742 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
743 * handled by our uvar callback. */
745 #endif /* VMG_UVAR */
751 STATIC UV vmg_dispell(pTHX_ SV *sv, const SV *wiz) {
752 #define vmg_dispell(S, W) vmg_dispell(aTHX_ (S), (W))
755 #endif /* VMG_UVAR */
756 MAGIC *mg, *prevmagic, *moremagic = NULL;
757 UV wid = vmg_wizard_id(wiz);
759 if (SvTYPE(sv) < SVt_PVMG)
762 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
763 moremagic = mg->mg_moremagic;
764 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
765 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
766 UV zid = vmg_wizard_id(mg->mg_ptr);
769 /* If the current has no uvar, short-circuit uvar deletion. */
770 uvars = z->uvar ? (uvars + 1) : 0;
771 #endif /* VMG_UVAR */
774 } else if (z->uvar) {
776 /* We can't break here since we need to find the ext magic to delete. */
777 #endif /* VMG_UVAR */
785 prevmagic->mg_moremagic = moremagic;
787 SvMAGIC_set(sv, moremagic);
789 mg->mg_moremagic = NULL;
791 /* Destroy private data */
792 if (mg->mg_obj != sv)
793 SvREFCNT_dec(mg->mg_obj);
794 /* Unreference the wizard */
795 SvREFCNT_dec((SV *) mg->mg_ptr);
799 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
800 /* mg was the first ext magic in the chain that had uvar */
802 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
803 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
804 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
814 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
815 moremagic = mg->mg_moremagic;
816 if (mg->mg_type == PERL_MAGIC_uvar)
820 uf = (struct ufuncs *) mg->mg_ptr;
821 /* assert(uf->uf_val == vmg_svt_val); */
822 if (uf[1].uf_val || uf[1].uf_set) {
823 /* Revert the original uvar magic. */
825 Renew(uf, 1, struct ufuncs);
826 mg->mg_ptr = (char *) uf;
827 mg->mg_len = sizeof(struct ufuncs);
829 /* Remove the uvar magic. */
830 vmg_uvar_del(sv, prevmagic, mg, moremagic);
834 #endif /* VMG_UVAR */
839 /* ... OP info ............................................................. */
841 #define VMG_OP_INFO_NAME 1
842 #define VMG_OP_INFO_OBJECT 2
845 STATIC perl_mutex vmg_op_name_init_mutex;
848 STATIC U32 vmg_op_name_init = 0;
849 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
851 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
852 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
854 case VMG_OP_INFO_NAME:
856 MUTEX_LOCK(&vmg_op_name_init_mutex);
858 if (!vmg_op_name_init) {
860 for (t = 0; t < OP_max; ++t)
861 vmg_op_name_len[t] = strlen(PL_op_name[t]);
862 vmg_op_name_init = 1;
865 MUTEX_UNLOCK(&vmg_op_name_init_mutex);
868 case VMG_OP_INFO_OBJECT: {
870 if (!MY_CXT.b__op_stashes[0]) {
873 for (c = 0; c < OPc_MAX; ++c)
874 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
883 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
884 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
889 case VMG_OP_INFO_NAME: {
890 OPCODE t = PL_op->op_type;
891 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
893 case VMG_OP_INFO_OBJECT: {
895 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
896 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
905 /* ... svt callbacks ....................................................... */
907 #define VMG_CB_CALL_SET_RET(D) \
912 ret = SvOK(svr) ? SvIV(svr) : (D); \
916 #define VMG_CB_CALL_ARGS_MASK 15
917 #define VMG_CB_CALL_ARGS_SHIFT 4
918 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
920 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
923 unsigned int i, args, opinfo;
927 args = flags & VMG_CB_CALL_ARGS_MASK;
928 flags >>= VMG_CB_CALL_ARGS_SHIFT;
929 opinfo = flags & VMG_CB_CALL_OPINFO;
935 EXTEND(SP, args + 1);
936 PUSHs(sv_2mortal(newRV_inc(sv)));
938 for (i = 0; i < args; ++i) {
939 SV *sva = va_arg(ap, SV *);
940 PUSHs(sva ? sva : &PL_sv_undef);
944 XPUSHs(vmg_op_info(opinfo));
947 call_sv(cb, G_SCALAR);
949 VMG_CB_CALL_SET_RET(0);
957 #define vmg_cb_call1(I, F, S, A1) \
958 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 1), (S), (A1))
959 #define vmg_cb_call2(I, F, S, A1, A2) \
960 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 2), (S), (A1), (A2))
961 #define vmg_cb_call3(I, F, S, A1, A2, A3) \
962 vmg_cb_call(aTHX_ (I), (((F) << VMG_CB_CALL_ARGS_SHIFT) | 3), (S), (A1), (A2), (A3))
964 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
965 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
966 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
969 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
970 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
971 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
974 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
975 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
976 unsigned int opinfo = w->opinfo;
978 svtype t = SvTYPE(sv);
987 PUSHs(sv_2mortal(newRV_inc(sv)));
988 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
991 const U8 *s = (const U8 *) SvPV_const(sv, l);
993 len = utf8_length(s, s + l);
997 } else if (t == SVt_PVAV) {
998 len = av_len((AV *) sv) + 1;
1002 PUSHs(&PL_sv_undef);
1005 XPUSHs(vmg_op_info(opinfo));
1008 call_sv(w->cb_len, G_SCALAR);
1010 VMG_CB_CALL_SET_RET(len);
1015 return t == SVt_PVAV ? ret - 1 : ret;
1018 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
1019 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1020 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
1023 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
1025 #if VMG_HAS_PERL(5, 9, 5)
1026 PERL_CONTEXT saved_cx;
1029 unsigned int had_err, has_err, flags = G_SCALAR | G_EVAL;
1034 /* Don't even bother if we are in global destruction - the wizard is prisoner
1035 * of circular references and we are way beyond user realm */
1039 w = vmg_wizard_mgwiz(mg->mg_ptr);
1041 /* So that it survives the temp cleanup below */
1044 #if !VMG_HAS_PERL_MAINT(5, 11, 0, 32686)
1045 /* The previous magic tokens were freed but the magic chain wasn't updated, so
1046 * if you access the sv from the callback the old deleted magics will trigger
1047 * and cause memory misreads. Change 32686 solved it that way : */
1048 SvMAGIC_set(sv, mg);
1056 PUSHs(sv_2mortal(newRV_inc(sv)));
1057 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1059 XPUSHs(vmg_op_info(w->opinfo));
1062 had_err = SvTRUE(ERRSV);
1066 #if VMG_HAS_PERL(5, 9, 5)
1067 /* This context should not be used anymore, but since we croak in places the
1068 * core doesn't even dare to, some pointers to it may remain in the upper call
1069 * stack. Make sure call_sv() doesn't clobber it. */
1070 if (cxstack_ix < cxstack_max)
1071 cxix = cxstack_ix + 1;
1073 cxix = Perl_cxinc(aTHX);
1074 saved_cx = cxstack[cxix];
1077 call_sv(w->cb_free, flags);
1079 #if VMG_HAS_PERL(5, 9, 5)
1080 cxstack[cxix] = saved_cx;
1083 has_err = SvTRUE(ERRSV);
1084 if (IN_PERL_COMPILETIME && !had_err && has_err)
1087 VMG_CB_CALL_SET_RET(0);
1092 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
1093 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
1096 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
1097 * mg->mg_ptr reference count */
1102 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
1103 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256)
1110 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1113 if (keylen == HEf_SVKEY) {
1116 keysv = newSVpvn(key, keylen);
1119 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
1121 if (keylen != HEf_SVKEY) {
1122 SvREFCNT_dec(keysv);
1127 #endif /* MGf_COPY */
1130 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
1133 #endif /* MGf_DUP */
1136 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
1137 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1138 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
1140 #endif /* MGf_LOCAL */
1143 STATIC OP *vmg_pp_resetuvar(pTHX) {
1144 SvRMAGICAL_on(cSVOP_sv);
1148 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
1151 SV *key = NULL, *newkey = NULL;
1154 umg = mg_find(sv, PERL_MAGIC_uvar);
1155 /* umg can't be NULL or we wouldn't be there. */
1157 uf = (struct ufuncs *) umg->mg_ptr;
1160 uf[1].uf_val(aTHX_ action, sv);
1162 uf[1].uf_set(aTHX_ action, sv);
1164 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
1165 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
1167 switch (mg->mg_type) {
1168 case PERL_MAGIC_ext:
1170 case PERL_MAGIC_tied:
1176 if (mg->mg_private != SIG_WIZ) continue;
1177 w = vmg_wizard_mgwiz(mg->mg_ptr);
1183 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
1188 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
1190 case HV_FETCH_ISSTORE:
1191 case HV_FETCH_LVALUE:
1192 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
1194 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
1196 case HV_FETCH_ISEXISTS:
1198 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
1202 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
1207 if (SvRMAGICAL(sv) && !tied) {
1208 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
1209 * mistaken for a tied hash by the rest of hv_common. It will be reset by
1210 * the op_ppaddr of a new fake op injected between the current and the next
1213 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
1215 NewOp(1101, svop, 1, SVOP);
1216 svop->op_type = OP_STUB;
1217 svop->op_ppaddr = vmg_pp_resetuvar;
1218 svop->op_next = o->op_next;
1221 o->op_next = (OP *) svop;
1228 #endif /* VMG_UVAR */
1230 /* --- Macros for the XS section ------------------------------------------- */
1232 #define VMG_SET_CB(S, N) \
1234 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? SvREFCNT_inc(SvRV(cb)) : NULL;
1236 #define VMG_SET_SVT_CB(S, N) \
1238 if (SvOK(cb) && SvROK(cb)) { \
1239 t->svt_ ## N = vmg_svt_ ## N; \
1240 w->cb_ ## N = SvREFCNT_inc(SvRV(cb)); \
1242 t->svt_ ## N = NULL; \
1243 w->cb_ ## N = NULL; \
1248 STATIC void vmg_cleanup(pTHX_ void *ud) {
1251 ptable_free(MY_CXT.wizards);
1252 MY_CXT.wizards = NULL;
1255 #endif /* VMG_THREADSAFE */
1257 /* --- XS ------------------------------------------------------------------ */
1259 MODULE = Variable::Magic PACKAGE = Variable::Magic
1269 MY_CXT.wizards = ptable_new();
1270 MY_CXT.owner = aTHX;
1272 MY_CXT.b__op_stashes[0] = NULL;
1274 MUTEX_INIT(&vmg_op_name_init_mutex);
1275 call_atexit(vmg_cleanup, NULL);
1278 stash = gv_stashpv(__PACKAGE__, 1);
1279 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1280 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1281 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1282 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1283 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1284 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1285 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID",
1286 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID));
1287 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1288 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1289 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1290 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1291 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1292 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1293 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1294 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1295 newCONSTSUB(stash, "VMG_FORKSAFE", newSVuv(VMG_FORKSAFE));
1296 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1297 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1307 U32 had_b__op_stash = 0;
1314 ud.wizards = t = ptable_new();
1315 ud.owner = MY_CXT.owner;
1316 ptable_walk(MY_CXT.wizards, vmg_ptable_clone, &ud);
1318 for (c = 0; c < OPc_MAX; ++c) {
1319 if (MY_CXT.b__op_stashes[c])
1320 had_b__op_stash |= (((U32) 1) << c);
1326 MY_CXT.owner = aTHX;
1327 for (c = 0; c < OPc_MAX; ++c) {
1328 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1329 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1334 #endif /* VMG_THREADSAFE */
1349 #endif /* MGf_COPY */
1352 #endif /* MGf_DUP */
1355 #endif /* MGf_LOCAL */
1358 #endif /* VMG_UVAR */
1359 ) { croak(vmg_wrongargnum); }
1364 VMG_SET_CB(ST(i++), data);
1366 w->opinfo = SvOK(cb) ? SvUV(cb) : 0;
1368 vmg_op_info_init(w->opinfo);
1369 VMG_SET_SVT_CB(ST(i++), get);
1370 VMG_SET_SVT_CB(ST(i++), set);
1371 VMG_SET_SVT_CB(ST(i++), len);
1372 VMG_SET_SVT_CB(ST(i++), clear);
1373 VMG_SET_SVT_CB(ST(i++), free);
1375 VMG_SET_SVT_CB(ST(i++), copy);
1376 #endif /* MGf_COPY */
1378 /* VMG_SET_SVT_CB(ST(i++), dup); */
1382 #endif /* MGf_DUP */
1384 VMG_SET_SVT_CB(ST(i++), local);
1385 #endif /* MGf_LOCAL */
1387 VMG_SET_CB(ST(i++), fetch);
1388 VMG_SET_CB(ST(i++), store);
1389 VMG_SET_CB(ST(i++), exists);
1390 VMG_SET_CB(ST(i++), delete);
1392 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1393 w->uvar = SvTRUE(cb) ? 2 : 1;
1396 #endif /* VMG_UVAR */
1397 #if VMG_MULTIPLICITY
1399 #endif /* VMG_MULTIPLICITY */
1402 ptable_store(MY_CXT.wizards, w, w);
1403 #endif /* VMG_THREADSAFE */
1405 RETVAL = newRV_noinc(vmg_wizard_new(w));
1409 SV *cast(SV *sv, SV *wiz, ...)
1410 PROTOTYPE: \[$@%&*]$@
1418 av_fill(args, items - 2);
1419 for (i = 2; i < items; ++i) {
1422 if (av_store(args, i - 2, arg) == NULL) croak(vmg_argstorefailed);
1425 ret = newSVuv(vmg_cast(SvRV(sv), vmg_wizard_validate(wiz), args));
1432 getdata(SV *sv, SV *wiz)
1433 PROTOTYPE: \[$@%&*]$
1437 data = vmg_data_get(SvRV(sv), vmg_wizard_validate(wiz));
1443 SV *dispell(SV *sv, SV *wiz)
1444 PROTOTYPE: \[$@%&*]$
1446 RETVAL = newSVuv(vmg_dispell(SvRV(sv), vmg_wizard_validate(wiz)));