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
58 #if VMG_MULTIPLICITY && !defined(tTHX)
59 # define tTHX PerlInterpreter*
62 #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))
63 # define VMG_THREADSAFE 1
65 # define MY_CXT_CLONE \
67 my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
68 Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
69 sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
72 # define VMG_THREADSAFE 0
74 # define dMY_CXT dNOOP
76 # define MY_CXT vmg_globaldata
78 # define START_MY_CXT STATIC my_cxt_t MY_CXT;
80 # define MY_CXT_INIT NOOP
82 # define MY_CXT_CLONE NOOP
87 STATIC SV *vmg_clone(pTHX_ SV *sv, tTHX owner) {
88 #define vmg_clone(P, O) vmg_clone(aTHX_ (P), (O))
91 #if VMG_HAS_PERL(5, 13, 2)
92 CLONE_PARAMS *param = Perl_clone_params_new(owner, aTHX);
94 dupsv = sv_dup(sv, param);
96 Perl_clone_params_del(param);
100 param.stashes = NULL; /* don't need it unless sv is a PVHV */
102 param.proto_perl = owner;
104 dupsv = sv_dup(sv, ¶m);
107 return SvREFCNT_inc(dupsv);
110 #endif /* VMG_THREADSAFE */
112 /* --- Compatibility ------------------------------------------------------- */
115 # define Newx(v, n, c) New(0, v, n, c)
119 # define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
123 # define SvRV_const(sv) SvRV((SV *) sv)
126 #ifndef SvREFCNT_inc_simple_void
127 # define SvREFCNT_inc_simple_void(sv) ((void) SvREFCNT_inc(sv))
131 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
134 #ifndef PERL_MAGIC_ext
135 # define PERL_MAGIC_ext '~'
138 #ifndef PERL_MAGIC_tied
139 # define PERL_MAGIC_tied 'P'
154 #ifndef IN_PERL_COMPILETIME
155 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
158 /* uvar magic and Hash::Util::FieldHash were commited with 28419, but we only
159 * enable them on 5.10 */
160 #if VMG_HAS_PERL(5, 10, 0)
166 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160, partially
167 * reverted to dev-5.11 as 9cdcb38b */
168 #if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
169 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
170 # if VMG_HAS_PERL(5, 11, 0)
171 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
173 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
176 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
177 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 1
180 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
181 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
183 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
184 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 0
188 /* Applied to dev-5.11 as 34908 */
189 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908) || VMG_HAS_PERL(5, 12, 0)
190 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
192 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
195 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
196 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
197 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
199 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
202 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969) || VMG_HAS_PERL(5, 12, 0)
203 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
205 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
208 #if VMG_HAS_PERL(5, 13, 2)
209 # define VMG_COMPAT_GLOB_GET 1
211 # define VMG_COMPAT_GLOB_GET 0
214 /* ... Bug-free mg_magical ................................................. */
216 /* See the discussion at http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html */
218 #if VMG_HAS_PERL(5, 11, 3)
220 #define vmg_mg_magical(S) mg_magical(S)
224 STATIC void vmg_mg_magical(SV *sv) {
228 if ((mg = SvMAGIC(sv))) {
230 const MGVTBL* const vtbl = mg->mg_virtual;
232 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
239 } while ((mg = mg->mg_moremagic));
240 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
247 /* ... Safe version of call_sv() ........................................... */
249 #define VMG_SAVE_LAST_CX (!VMG_HAS_PERL(5, 8, 4) || VMG_HAS_PERL(5, 9, 5))
251 STATIC I32 vmg_call_sv(pTHX_ SV *sv, I32 flags, I32 destructor) {
252 #define vmg_call_sv(S, F, D) vmg_call_sv(aTHX_ (S), (F), (D))
253 I32 ret, cxix = 0, in_eval = 0;
255 PERL_CONTEXT saved_cx;
264 if (cxstack_ix < cxstack_max) {
265 cxix = cxstack_ix + 1;
266 if (destructor && CxTYPE(cxstack + cxix) == CXt_EVAL)
271 /* The last popped context will be reused by call_sv(), but our callers may
272 * still need its previous value. Back it up so that it isn't clobbered. */
273 saved_cx = cxstack[cxix];
276 ret = call_sv(sv, flags | G_EVAL);
279 cxstack[cxix] = saved_cx;
284 sv_setsv(old_err, ERRSV);
288 if (IN_PERL_COMPILETIME) {
291 sv_catsv(PL_errors, ERRSV);
293 Perl_warn(aTHX_ "%s", SvPV_nolen(ERRSV));
296 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
298 ++PL_parser->error_count;
299 #elif defined(PL_error_count)
316 /* --- Stolen chunk of B --------------------------------------------------- */
334 STATIC const char *const vmg_opclassnames[] = {
349 STATIC opclass vmg_opclass(const OP *o) {
356 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
358 if (o->op_type == OP_SASSIGN)
359 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
361 if (o->op_type == OP_AELEMFAST) {
362 #if PERL_VERSION <= 14
363 if (o->op_flags & OPf_SPECIAL)
375 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
379 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
396 case OA_PVOP_OR_SVOP:
397 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
402 case OA_BASEOP_OR_UNOP:
403 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
405 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
407 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
409 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
412 if (o->op_flags & OPf_STACKED)
414 else if (o->op_flags & OPf_SPECIAL)
423 /* --- Error messages ------------------------------------------------------ */
425 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
426 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
427 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
429 /* --- Signatures ---------------------------------------------------------- */
431 #define SIG_WZO ((U16) (0x3891))
432 #define SIG_WIZ ((U16) (0x3892))
434 /* --- MGWIZ structure ----------------------------------------------------- */
443 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
446 #endif /* MGf_COPY */
452 #endif /* MGf_LOCAL */
454 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
455 #endif /* VMG_UVAR */
459 #endif /* VMG_MULTIPLICITY */
462 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo);
464 STATIC MGWIZ *vmg_mgwiz_alloc(pTHX_ UV opinfo) {
465 #define vmg_mgwiz_alloc(O) vmg_mgwiz_alloc(aTHX_ (O))
472 w->opinfo = (U8) ((opinfo < 255) ? opinfo : 255);
474 vmg_op_info_init(aTHX_ w->opinfo);
482 STATIC void vmg_mgwiz_free(pTHX_ MGWIZ *w) {
483 #define vmg_mgwiz_free(W) vmg_mgwiz_free(aTHX_ (W))
487 /* We reach this point in dirty state when ptable_free() is called from the
488 * atexit cleanup callback, and that the global table still holds a live
489 * wizard. This happens before all the SV bodies are freed, so all the wizard
490 * callbacks are still alive (as they are referenced by the undead wizard).
491 * Hence it is safe to decrement their refcount. Later on, the wizard free
492 * callback itself will trigger when the wizard body is reaped, but it will
493 * be skipped as it guards against dirty state - which is good since nothing
494 * has to be done anymore at that point. */
496 SvREFCNT_dec(w->cb_data);
497 SvREFCNT_dec(w->cb_get);
498 SvREFCNT_dec(w->cb_set);
499 SvREFCNT_dec(w->cb_len);
500 SvREFCNT_dec(w->cb_clear);
501 SvREFCNT_dec(w->cb_free);
503 SvREFCNT_dec(w->cb_copy);
504 #endif /* MGf_COPY */
506 SvREFCNT_dec(w->cb_dup);
509 SvREFCNT_dec(w->cb_local);
510 #endif /* MGf_LOCAL */
512 SvREFCNT_dec(w->cb_fetch);
513 SvREFCNT_dec(w->cb_store);
514 SvREFCNT_dec(w->cb_exists);
515 SvREFCNT_dec(w->cb_delete);
516 #endif /* VMG_UVAR */
526 #define VMG_CLONE_CB(N) \
527 z->cb_ ## N = (w->cb_ ## N) ? vmg_clone(w->cb_ ## N, w->owner) \
530 STATIC MGWIZ *vmg_mgwiz_clone(pTHX_ const MGWIZ *w) {
531 #define vmg_mgwiz_clone(W) vmg_mgwiz_clone(aTHX_ (W))
539 Copy(w->vtbl, t, 1, MGVTBL);
545 z->opinfo = w->opinfo;
555 #endif /* MGf_COPY */
561 #endif /* MGf_LOCAL */
565 VMG_CLONE_CB(exists);
566 VMG_CLONE_CB(delete);
567 #endif /* VMG_UVAR */
574 #endif /* VMG_THREADSAFE */
576 /* --- Context-safe global data -------------------------------------------- */
580 #define PTABLE_NAME ptable
581 #define PTABLE_VAL_FREE(V) vmg_mgwiz_free(VOID2(MGWIZ *, (V)))
590 #define ptable_store(T, K, V) ptable_store(aTHX_ (T), (K), (V))
591 #define ptable_clear(T) ptable_clear(aTHX_ (T))
592 #define ptable_free(T) ptable_free(aTHX_ (T))
594 #endif /* VMG_THREADSAFE */
596 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
603 HV *b__op_stashes[OPc_MAX];
610 STATIC void vmg_ptable_clone(pTHX_ ptable_ent *ent, void *ud_) {
611 my_cxt_t *ud = VOID2(my_cxt_t *, ud_);
614 if (ud->owner == aTHX)
617 w = vmg_mgwiz_clone(VOID2(MGWIZ *, ent->val));
619 ptable_store(ud->wizards, ent->key, w);
622 #endif /* VMG_THREADSAFE */
624 /* --- Wizard objects ------------------------------------------------------ */
626 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg);
628 STATIC MGVTBL vmg_wizard_vtbl = {
633 vmg_wizard_free, /* free */
636 #endif /* MGf_COPY */
642 #endif /* MGf_LOCAL */
645 /* ... Wizard constructor .................................................. */
647 STATIC SV *vmg_wizard_new(pTHX_ const MGWIZ *w) {
648 #define vmg_wizard_new(W) vmg_wizard_new(aTHX_ (W))
649 SV *wiz = newSVuv(PTR2IV(w));
652 MAGIC *mg = sv_magicext(wiz, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
653 mg->mg_private = SIG_WZO;
660 STATIC const SV *vmg_wizard_validate(pTHX_ const SV *wiz) {
661 #define vmg_wizard_validate(W) vmg_wizard_validate(aTHX_ (W))
663 wiz = SvRV_const(wiz);
668 croak(vmg_invalid_wiz);
673 #define vmg_wizard_id(W) SvIVX((const SV *) (W))
674 #define vmg_wizard_main_mgwiz(W) INT2PTR(const MGWIZ *, vmg_wizard_id(W))
676 /* ... Wizard destructor ................................................... */
678 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg) {
681 if (PL_dirty) /* During global destruction, the context is already freed */
684 w = (MGWIZ *) vmg_wizard_main_mgwiz(sv);
689 ptable_store(MY_CXT.wizards, w, NULL);
691 #else /* VMG_THREADSAFE */
693 #endif /* !VMG_THREADSAFE */
700 STATIC const MGWIZ *vmg_wizard_mgwiz(pTHX_ const SV *wiz) {
701 #define vmg_wizard_mgwiz(W) vmg_wizard_mgwiz(aTHX_ ((const SV *) (W)))
704 w = vmg_wizard_main_mgwiz(wiz);
705 if (w->owner == aTHX)
710 return VOID2(const MGWIZ *, ptable_fetch(MY_CXT.wizards, w));
714 #else /* VMG_THREADSAFE */
716 #define vmg_wizard_mgwiz(W) vmg_wizard_main_mgwiz(W)
718 #endif /* !VMG_THREADSAFE */
720 /* --- User-level functions implementation --------------------------------- */
722 STATIC const MAGIC *vmg_find(const SV *sv, const SV *wiz) {
723 const MAGIC *mg, *moremagic;
726 if (SvTYPE(sv) < SVt_PVMG)
729 wid = vmg_wizard_id(wiz);
730 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
731 moremagic = mg->mg_moremagic;
732 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
733 IV zid = vmg_wizard_id(mg->mg_ptr);
742 /* ... Construct private data .............................................. */
744 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, SV **args, I32 items) {
745 #define vmg_data_new(C, S, A, I) vmg_data_new(aTHX_ (C), (S), (A), (I))
755 EXTEND(SP, items + 1);
756 PUSHs(sv_2mortal(newRV_inc(sv)));
757 for (i = 0; i < items; ++i)
761 vmg_call_sv(ctor, G_SCALAR, 0);
765 #if VMG_HAS_PERL(5, 8, 3)
766 SvREFCNT_inc_simple_void(nsv); /* Or it will be destroyed in FREETMPS */
768 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
778 STATIC SV *vmg_data_get(pTHX_ SV *sv, const SV *wiz) {
779 #define vmg_data_get(S, W) vmg_data_get(aTHX_ (S), (W))
780 const MAGIC *mg = vmg_find(sv, wiz);
781 return mg ? mg->mg_obj : NULL;
784 /* ... Magic cast/dispell .................................................. */
787 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
789 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
791 prevmagic->mg_moremagic = moremagic;
793 SvMAGIC_set(sv, moremagic);
795 mg->mg_moremagic = NULL;
796 Safefree(mg->mg_ptr);
799 #endif /* VMG_UVAR */
801 STATIC UV vmg_cast(pTHX_ SV *sv, const SV *wiz, SV **args, I32 items) {
802 #define vmg_cast(S, W, A, I) vmg_cast(aTHX_ (S), (W), (A), (I))
808 if (vmg_find(sv, wiz))
811 w = vmg_wizard_mgwiz(wiz);
812 oldgmg = SvGMAGICAL(sv);
814 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args, items) : NULL;
815 /* sv_magicext() calls mg_magical and increments data's refcount */
816 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl,
817 (const char *) wiz, HEf_SVKEY);
819 mg->mg_private = SIG_WIZ;
822 mg->mg_flags |= MGf_COPY;
823 #endif /* MGf_COPY */
826 mg->mg_flags |= MGf_DUP;
830 mg->mg_flags |= MGf_LOCAL;
831 #endif /* MGf_LOCAL */
833 if (SvTYPE(sv) < SVt_PVHV)
836 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
837 * magic is actually never called for them. If the GMAGICAL flag was off before
838 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
839 * now on, then this wizard has get magic. Hence we can work around the
840 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
841 * has uvar callbacks, it will be turned back on later. */
842 if (!oldgmg && SvGMAGICAL(sv))
847 MAGIC *prevmagic, *moremagic = NULL;
850 uf[0].uf_val = vmg_svt_val;
857 /* One uvar magic in the chain is enough. */
858 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
859 moremagic = mg->mg_moremagic;
860 if (mg->mg_type == PERL_MAGIC_uvar)
864 if (mg) { /* Found another uvar magic. */
865 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
866 if (olduf->uf_val == vmg_svt_val) {
867 /* It's our uvar magic, nothing to do. oldgmg was true. */
870 /* It's another uvar magic, backup it and replace it by ours. */
872 vmg_uvar_del(sv, prevmagic, mg, moremagic);
876 sv_magic(sv, NULL, PERL_MAGIC_uvar, (const char *) &uf, sizeof(uf));
878 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
879 * handled by our uvar callback. */
881 #endif /* VMG_UVAR */
887 STATIC UV vmg_dispell(pTHX_ SV *sv, const SV *wiz) {
888 #define vmg_dispell(S, W) vmg_dispell(aTHX_ (S), (W))
891 #endif /* VMG_UVAR */
892 MAGIC *mg, *prevmagic, *moremagic = NULL;
893 IV wid = vmg_wizard_id(wiz);
895 if (SvTYPE(sv) < SVt_PVMG)
898 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
899 moremagic = mg->mg_moremagic;
900 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
902 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
903 #endif /* VMG_UVAR */
904 IV zid = vmg_wizard_id(mg->mg_ptr);
907 /* If the current has no uvar, short-circuit uvar deletion. */
908 uvars = z->uvar ? (uvars + 1) : 0;
909 #endif /* VMG_UVAR */
912 } else if (z->uvar) {
914 /* We can't break here since we need to find the ext magic to delete. */
915 #endif /* VMG_UVAR */
923 prevmagic->mg_moremagic = moremagic;
925 SvMAGIC_set(sv, moremagic);
927 mg->mg_moremagic = NULL;
929 /* Destroy private data */
930 if (mg->mg_obj != sv)
931 SvREFCNT_dec(mg->mg_obj);
932 /* Unreference the wizard */
933 SvREFCNT_dec((SV *) mg->mg_ptr);
937 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
938 /* mg was the first ext magic in the chain that had uvar */
940 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
941 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
942 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
952 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
953 moremagic = mg->mg_moremagic;
954 if (mg->mg_type == PERL_MAGIC_uvar)
958 uf = (struct ufuncs *) mg->mg_ptr;
959 /* assert(uf->uf_val == vmg_svt_val); */
960 if (uf[1].uf_val || uf[1].uf_set) {
961 /* Revert the original uvar magic. */
963 Renew(uf, 1, struct ufuncs);
964 mg->mg_ptr = (char *) uf;
965 mg->mg_len = sizeof(struct ufuncs);
967 /* Remove the uvar magic. */
968 vmg_uvar_del(sv, prevmagic, mg, moremagic);
972 #endif /* VMG_UVAR */
979 /* ... OP info ............................................................. */
981 #define VMG_OP_INFO_NAME 1
982 #define VMG_OP_INFO_OBJECT 2
985 STATIC perl_mutex vmg_op_name_init_mutex;
988 STATIC U32 vmg_op_name_init = 0;
989 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
991 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
992 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
994 case VMG_OP_INFO_NAME:
996 MUTEX_LOCK(&vmg_op_name_init_mutex);
998 if (!vmg_op_name_init) {
1000 for (t = 0; t < OP_max; ++t)
1001 vmg_op_name_len[t] = strlen(PL_op_name[t]);
1002 vmg_op_name_init = 1;
1005 MUTEX_UNLOCK(&vmg_op_name_init_mutex);
1008 case VMG_OP_INFO_OBJECT: {
1010 if (!MY_CXT.b__op_stashes[0]) {
1013 for (c = OPc_NULL; c < OPc_MAX; ++c)
1014 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
1023 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
1024 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
1026 return &PL_sv_undef;
1029 case VMG_OP_INFO_NAME: {
1030 OPCODE t = PL_op->op_type;
1031 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
1033 case VMG_OP_INFO_OBJECT: {
1035 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
1036 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
1042 return &PL_sv_undef;
1045 /* ... svt callbacks ....................................................... */
1047 #define VMG_CB_CALL_ARGS_MASK 15
1048 #define VMG_CB_CALL_ARGS_SHIFT 4
1049 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
1051 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
1054 unsigned int i, args, opinfo;
1059 args = flags & VMG_CB_CALL_ARGS_MASK;
1060 flags >>= VMG_CB_CALL_ARGS_SHIFT;
1061 opinfo = flags & VMG_CB_CALL_OPINFO;
1067 EXTEND(SP, args + 1);
1068 PUSHs(sv_2mortal(newRV_inc(sv)));
1070 for (i = 0; i < args; ++i) {
1071 SV *sva = va_arg(ap, SV *);
1072 PUSHs(sva ? sva : &PL_sv_undef);
1076 XPUSHs(vmg_op_info(opinfo));
1079 vmg_call_sv(cb, G_SCALAR, 0);
1084 ret = (int) SvIV(svr);
1093 #define VMG_CB_FLAGS(OI, A) \
1094 ((((unsigned int) (OI)) << VMG_CB_CALL_ARGS_SHIFT) | (A))
1096 #define vmg_cb_call1(I, OI, S, A1) \
1097 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 1), (S), (A1))
1098 #define vmg_cb_call2(I, OI, S, A1, A2) \
1099 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 2), (S), (A1), (A2))
1100 #define vmg_cb_call3(I, OI, S, A1, A2, A3) \
1101 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 3), (S), (A1), (A2), (A3))
1103 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
1104 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1105 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
1108 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
1109 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1110 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
1113 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
1114 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1115 unsigned int opinfo = w->opinfo;
1118 svtype t = SvTYPE(sv);
1127 PUSHs(sv_2mortal(newRV_inc(sv)));
1128 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1131 #if VMG_HAS_PERL(5, 9, 3)
1132 const U8 *s = VOID2(const U8 *, VOID2(const void *, SvPV_const(sv, l)));
1134 U8 *s = SvPV(sv, l);
1137 len = utf8_length(s, s + l);
1141 } else if (t == SVt_PVAV) {
1142 len = av_len((AV *) sv) + 1;
1146 PUSHs(&PL_sv_undef);
1149 XPUSHs(vmg_op_info(opinfo));
1152 vmg_call_sv(w->cb_len, G_SCALAR, 0);
1156 ret = SvOK(svr) ? (U32) SvUV(svr) : len;
1167 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
1168 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1169 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
1172 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
1179 /* Don't even bother if we are in global destruction - the wizard is prisoner
1180 * of circular references and we are way beyond user realm */
1184 w = vmg_wizard_mgwiz(mg->mg_ptr);
1186 /* So that it survives the temp cleanup below */
1187 SvREFCNT_inc_simple_void(sv);
1189 #if !(VMG_HAS_PERL_MAINT(5, 11, 0, 32686) || VMG_HAS_PERL(5, 12, 0))
1190 /* The previous magic tokens were freed but the magic chain wasn't updated, so
1191 * if you access the sv from the callback the old deleted magics will trigger
1192 * and cause memory misreads. Change 32686 solved it that way : */
1193 SvMAGIC_set(sv, mg);
1201 PUSHs(sv_2mortal(newRV_inc(sv)));
1202 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1204 XPUSHs(vmg_op_info(w->opinfo));
1207 vmg_call_sv(w->cb_free, G_SCALAR, 1);
1212 ret = (int) SvIV(svr);
1218 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
1219 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
1222 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
1223 * mg->mg_ptr reference count */
1228 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
1229 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256) || VMG_HAS_PERL(5, 12, 0)
1236 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1239 if (keylen == HEf_SVKEY) {
1242 keysv = newSVpvn(key, keylen);
1245 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
1247 if (keylen != HEf_SVKEY) {
1248 SvREFCNT_dec(keysv);
1253 #endif /* MGf_COPY */
1256 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
1259 #endif /* MGf_DUP */
1262 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
1263 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1264 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
1266 #endif /* MGf_LOCAL */
1269 STATIC OP *vmg_pp_resetuvar(pTHX) {
1270 SvRMAGICAL_on(cSVOP_sv);
1274 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
1277 SV *key = NULL, *newkey = NULL;
1280 umg = mg_find(sv, PERL_MAGIC_uvar);
1281 /* umg can't be NULL or we wouldn't be there. */
1283 uf = (struct ufuncs *) umg->mg_ptr;
1286 uf[1].uf_val(aTHX_ action, sv);
1288 uf[1].uf_set(aTHX_ action, sv);
1290 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
1291 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
1293 switch (mg->mg_type) {
1294 case PERL_MAGIC_ext:
1296 case PERL_MAGIC_tied:
1302 if (mg->mg_private != SIG_WIZ) continue;
1303 w = vmg_wizard_mgwiz(mg->mg_ptr);
1309 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
1314 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
1316 case HV_FETCH_ISSTORE:
1317 case HV_FETCH_LVALUE:
1318 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
1320 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
1322 case HV_FETCH_ISEXISTS:
1324 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
1328 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
1333 if (SvRMAGICAL(sv) && !tied) {
1334 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
1335 * mistaken for a tied hash by the rest of hv_common. It will be reset by
1336 * the op_ppaddr of a new fake op injected between the current and the next
1339 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
1341 NewOp(1101, svop, 1, SVOP);
1342 svop->op_type = OP_STUB;
1343 svop->op_ppaddr = vmg_pp_resetuvar;
1344 svop->op_next = o->op_next;
1347 o->op_next = (OP *) svop;
1354 #endif /* VMG_UVAR */
1356 /* --- Macros for the XS section ------------------------------------------- */
1358 #define VMG_SET_CB(S, N) \
1360 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? SvREFCNT_inc(SvRV(cb)) : NULL;
1362 #define VMG_SET_SVT_CB(S, N) \
1364 if (SvOK(cb) && SvROK(cb)) { \
1365 t->svt_ ## N = vmg_svt_ ## N; \
1366 w->cb_ ## N = SvREFCNT_inc(SvRV(cb)); \
1368 t->svt_ ## N = NULL; \
1369 w->cb_ ## N = NULL; \
1374 STATIC void vmg_cleanup(pTHX_ void *ud) {
1377 ptable_free(MY_CXT.wizards);
1378 MY_CXT.wizards = NULL;
1381 #endif /* VMG_THREADSAFE */
1383 /* --- XS ------------------------------------------------------------------ */
1385 MODULE = Variable::Magic PACKAGE = Variable::Magic
1395 MY_CXT.wizards = ptable_new();
1396 MY_CXT.owner = aTHX;
1398 MY_CXT.b__op_stashes[0] = NULL;
1400 MUTEX_INIT(&vmg_op_name_init_mutex);
1401 call_atexit(vmg_cleanup, NULL);
1404 stash = gv_stashpv(__PACKAGE__, 1);
1405 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1406 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1407 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1408 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1409 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1410 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1411 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID",
1412 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID));
1413 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1414 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1415 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1416 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1417 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1418 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1419 newCONSTSUB(stash, "VMG_COMPAT_GLOB_GET", newSVuv(VMG_COMPAT_GLOB_GET));
1420 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1421 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1422 newCONSTSUB(stash, "VMG_FORKSAFE", newSVuv(VMG_FORKSAFE));
1423 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1424 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1434 U32 had_b__op_stash = 0;
1441 ud.wizards = t = ptable_new();
1442 ud.owner = MY_CXT.owner;
1443 ptable_walk(MY_CXT.wizards, vmg_ptable_clone, &ud);
1445 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1446 if (MY_CXT.b__op_stashes[c])
1447 had_b__op_stash |= (((U32) 1) << c);
1453 MY_CXT.owner = aTHX;
1454 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1455 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1456 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1461 #endif /* VMG_THREADSAFE */
1469 SV *cb, *op_info, *copy_key;
1476 #endif /* MGf_COPY */
1479 #endif /* MGf_DUP */
1482 #endif /* MGf_LOCAL */
1485 #endif /* VMG_UVAR */
1486 ) { croak(vmg_wrongargnum); }
1489 w = vmg_mgwiz_alloc(SvOK(op_info) ? SvUV(op_info) : 0);
1492 VMG_SET_CB(ST(i++), data);
1494 VMG_SET_SVT_CB(ST(i++), get);
1495 VMG_SET_SVT_CB(ST(i++), set);
1496 VMG_SET_SVT_CB(ST(i++), len);
1497 VMG_SET_SVT_CB(ST(i++), clear);
1498 VMG_SET_SVT_CB(ST(i++), free);
1500 VMG_SET_SVT_CB(ST(i++), copy);
1501 #endif /* MGf_COPY */
1503 /* VMG_SET_SVT_CB(ST(i++), dup); */
1507 #endif /* MGf_DUP */
1509 VMG_SET_SVT_CB(ST(i++), local);
1510 #endif /* MGf_LOCAL */
1512 VMG_SET_CB(ST(i++), fetch);
1513 VMG_SET_CB(ST(i++), store);
1514 VMG_SET_CB(ST(i++), exists);
1515 VMG_SET_CB(ST(i++), delete);
1518 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1519 w->uvar = SvTRUE(copy_key) ? 2 : 1;
1520 #endif /* VMG_UVAR */
1521 #if VMG_MULTIPLICITY
1523 #endif /* VMG_MULTIPLICITY */
1525 ptable_store(MY_CXT.wizards, w, w);
1526 #endif /* VMG_THREADSAFE */
1528 RETVAL = newRV_noinc(vmg_wizard_new(w));
1532 SV *cast(SV *sv, SV *wiz, ...)
1533 PROTOTYPE: \[$@%&*]$@
1542 RETVAL = newSVuv(vmg_cast(SvRV(sv), vmg_wizard_validate(wiz), args, i));
1547 getdata(SV *sv, SV *wiz)
1548 PROTOTYPE: \[$@%&*]$
1552 data = vmg_data_get(SvRV(sv), vmg_wizard_validate(wiz));
1558 SV *dispell(SV *sv, SV *wiz)
1559 PROTOTYPE: \[$@%&*]$
1561 RETVAL = newSVuv(vmg_dispell(SvRV(sv), vmg_wizard_validate(wiz)));