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'
146 #ifndef IN_PERL_COMPILETIME
147 # define IN_PERL_COMPILETIME (PL_curcop == &PL_compiling)
150 /* uvar magic and Hash::Util::FieldHash were commited with 28419, but we only
151 * enable them on 5.10 */
152 #if VMG_HAS_PERL(5, 10, 0)
158 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160, partially
159 * reverted to dev-5.11 as 9cdcb38b */
160 #if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
161 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
162 # if VMG_HAS_PERL(5, 11, 0)
163 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
165 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
168 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
169 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 1
172 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
173 # define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
175 # ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID
176 # define VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID 0
180 /* Applied to dev-5.11 as 34908 */
181 #if VMG_HAS_PERL_MAINT(5, 11, 0, 34908) || VMG_HAS_PERL(5, 12, 0)
182 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 1
184 # define VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID 0
187 /* Applied to dev-5.9 as 31473 (see #43357), integrated to maint-5.8 as 32542 */
188 #if VMG_HAS_PERL_MAINT(5, 8, 9, 32542) || VMG_HAS_PERL_MAINT(5, 9, 5, 31473) || VMG_HAS_PERL(5, 10, 0)
189 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 1
191 # define VMG_COMPAT_ARRAY_UNDEF_CLEAR 0
194 #if VMG_HAS_PERL_MAINT(5, 11, 0, 32969) || VMG_HAS_PERL(5, 12, 0)
195 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 1
197 # define VMG_COMPAT_SCALAR_LENGTH_NOLEN 0
200 #if VMG_HAS_PERL(5, 13, 2)
201 # define VMG_COMPAT_GLOB_GET 1
203 # define VMG_COMPAT_GLOB_GET 0
206 /* ... Bug-free mg_magical ................................................. */
208 /* See the discussion at http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2008-01/msg00036.html */
210 #if VMG_HAS_PERL(5, 11, 3)
212 #define vmg_mg_magical(S) mg_magical(S)
216 STATIC void vmg_mg_magical(SV *sv) {
220 if ((mg = SvMAGIC(sv))) {
222 const MGVTBL* const vtbl = mg->mg_virtual;
224 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
231 } while ((mg = mg->mg_moremagic));
232 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
239 /* ... Safe version of call_sv() ........................................... */
241 #define VMG_SAVE_LAST_CX (!VMG_HAS_PERL(5, 8, 4) || VMG_HAS_PERL(5, 9, 5))
243 STATIC I32 vmg_call_sv(pTHX_ SV *sv, I32 flags, I32 destructor) {
244 #define vmg_call_sv(S, F, D) vmg_call_sv(aTHX_ (S), (F), (D))
245 I32 ret, cxix = 0, in_eval = 0;
247 PERL_CONTEXT saved_cx;
256 if (cxstack_ix < cxstack_max) {
257 cxix = cxstack_ix + 1;
258 if (destructor && CxTYPE(cxstack + cxix) == CXt_EVAL)
263 /* The last popped context will be reused by call_sv(), but our callers may
264 * still need its previous value. Back it up so that it isn't clobbered. */
265 saved_cx = cxstack[cxix];
268 ret = call_sv(sv, flags | G_EVAL);
271 cxstack[cxix] = saved_cx;
276 sv_setsv(old_err, ERRSV);
280 if (IN_PERL_COMPILETIME) {
283 sv_catsv(PL_errors, ERRSV);
285 Perl_warn(aTHX_ "%s", SvPV_nolen(ERRSV));
288 #if VMG_HAS_PERL(5, 10, 0) || defined(PL_parser)
290 ++PL_parser->error_count;
291 #elif defined(PL_error_count)
308 /* --- Stolen chunk of B --------------------------------------------------- */
326 STATIC const char *const vmg_opclassnames[] = {
341 STATIC opclass vmg_opclass(const OP *o) {
348 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
350 if (o->op_type == OP_SASSIGN)
351 return ((o->op_private & OPpASSIGN_BACKWARDS) ? OPc_UNOP : OPc_BINOP);
353 if (o->op_type == OP_AELEMFAST) {
354 #if PERL_VERSION <= 14
355 if (o->op_flags & OPf_SPECIAL)
367 if (o->op_type == OP_GV || o->op_type == OP_GVSV || o->op_type == OP_RCATLINE)
371 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
388 case OA_PVOP_OR_SVOP:
389 return (o->op_private & (OPpTRANS_TO_UTF|OPpTRANS_FROM_UTF)) ? OPc_SVOP : OPc_PVOP;
394 case OA_BASEOP_OR_UNOP:
395 return (o->op_flags & OPf_KIDS) ? OPc_UNOP : OPc_BASEOP;
397 return ((o->op_flags & OPf_KIDS) ? OPc_UNOP :
399 (o->op_flags & OPf_REF) ? OPc_PADOP : OPc_BASEOP);
401 (o->op_flags & OPf_REF) ? OPc_SVOP : OPc_BASEOP);
404 if (o->op_flags & OPf_STACKED)
406 else if (o->op_flags & OPf_SPECIAL)
415 /* --- Error messages ------------------------------------------------------ */
417 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
418 STATIC const char vmg_wrongargnum[] = "Wrong number of arguments";
419 STATIC const char vmg_argstorefailed[] = "Error while storing arguments";
421 /* --- Signatures ---------------------------------------------------------- */
423 #define SIG_WZO ((U16) (0x3891))
424 #define SIG_WIZ ((U16) (0x3892))
426 /* --- MGWIZ structure ----------------------------------------------------- */
435 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free;
440 #endif /* MGf_LOCAL */
442 SV *cb_fetch, *cb_store, *cb_exists, *cb_delete;
443 #endif /* VMG_UVAR */
447 #endif /* VMG_MULTIPLICITY */
450 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo);
452 STATIC MGWIZ *vmg_mgwiz_alloc(pTHX_ UV opinfo) {
453 #define vmg_mgwiz_alloc(O) vmg_mgwiz_alloc(aTHX_ (O))
460 w->opinfo = (U8) ((opinfo < 255) ? opinfo : 255);
462 vmg_op_info_init(aTHX_ w->opinfo);
470 STATIC void vmg_mgwiz_free(pTHX_ MGWIZ *w) {
471 #define vmg_mgwiz_free(W) vmg_mgwiz_free(aTHX_ (W))
475 /* We reach this point in dirty state when ptable_free() is called from the
476 * atexit cleanup callback, and that the global table still holds a live
477 * wizard. This happens before all the SV bodies are freed, so all the wizard
478 * callbacks are still alive (as they are referenced by the undead wizard).
479 * Hence it is safe to decrement their refcount. Later on, the wizard free
480 * callback itself will trigger when the wizard body is reaped, but it will
481 * be skipped as it guards against dirty state - which is good since nothing
482 * has to be done anymore at that point. */
484 SvREFCNT_dec(w->cb_data);
485 SvREFCNT_dec(w->cb_get);
486 SvREFCNT_dec(w->cb_set);
487 SvREFCNT_dec(w->cb_len);
488 SvREFCNT_dec(w->cb_clear);
489 SvREFCNT_dec(w->cb_free);
490 SvREFCNT_dec(w->cb_copy);
492 SvREFCNT_dec(w->cb_dup);
495 SvREFCNT_dec(w->cb_local);
496 #endif /* MGf_LOCAL */
498 SvREFCNT_dec(w->cb_fetch);
499 SvREFCNT_dec(w->cb_store);
500 SvREFCNT_dec(w->cb_exists);
501 SvREFCNT_dec(w->cb_delete);
502 #endif /* VMG_UVAR */
512 #define VMG_CLONE_CB(N) \
513 z->cb_ ## N = (w->cb_ ## N) ? vmg_clone(w->cb_ ## N, w->owner) \
516 STATIC MGWIZ *vmg_mgwiz_clone(pTHX_ const MGWIZ *w) {
517 #define vmg_mgwiz_clone(W) vmg_mgwiz_clone(aTHX_ (W))
525 Copy(w->vtbl, t, 1, MGVTBL);
531 z->opinfo = w->opinfo;
543 #endif /* MGf_LOCAL */
547 VMG_CLONE_CB(exists);
548 VMG_CLONE_CB(delete);
549 #endif /* VMG_UVAR */
556 #endif /* VMG_THREADSAFE */
558 /* --- Context-safe global data -------------------------------------------- */
562 #define PTABLE_NAME ptable
563 #define PTABLE_VAL_FREE(V) vmg_mgwiz_free(VOID2(MGWIZ *, (V)))
572 #define ptable_store(T, K, V) ptable_store(aTHX_ (T), (K), (V))
573 #define ptable_clear(T) ptable_clear(aTHX_ (T))
574 #define ptable_free(T) ptable_free(aTHX_ (T))
576 #endif /* VMG_THREADSAFE */
578 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
585 HV *b__op_stashes[OPc_MAX];
592 STATIC void vmg_ptable_clone(pTHX_ ptable_ent *ent, void *ud_) {
593 my_cxt_t *ud = VOID2(my_cxt_t *, ud_);
596 if (ud->owner == aTHX)
599 w = vmg_mgwiz_clone(VOID2(MGWIZ *, ent->val));
601 ptable_store(ud->wizards, ent->key, w);
604 #endif /* VMG_THREADSAFE */
606 /* --- Wizard objects ------------------------------------------------------ */
608 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg);
610 STATIC MGVTBL vmg_wizard_vtbl = {
615 vmg_wizard_free, /* free */
620 #endif /* MGf_LOCAL */
623 /* ... Wizard constructor .................................................. */
625 STATIC SV *vmg_wizard_new(pTHX_ const MGWIZ *w) {
626 #define vmg_wizard_new(W) vmg_wizard_new(aTHX_ (W))
627 SV *wiz = newSVuv(PTR2IV(w));
630 MAGIC *mg = sv_magicext(wiz, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, 0);
631 mg->mg_private = SIG_WZO;
638 STATIC const SV *vmg_wizard_validate(pTHX_ const SV *wiz) {
639 #define vmg_wizard_validate(W) vmg_wizard_validate(aTHX_ (W))
641 wiz = SvRV_const(wiz);
646 croak(vmg_invalid_wiz);
651 #define vmg_wizard_id(W) SvIVX((const SV *) (W))
652 #define vmg_wizard_main_mgwiz(W) INT2PTR(const MGWIZ *, vmg_wizard_id(W))
654 /* ... Wizard destructor ................................................... */
656 STATIC int vmg_wizard_free(pTHX_ SV *sv, MAGIC *mg) {
659 if (PL_dirty) /* During global destruction, the context is already freed */
662 w = (MGWIZ *) vmg_wizard_main_mgwiz(sv);
667 ptable_store(MY_CXT.wizards, w, NULL);
669 #else /* VMG_THREADSAFE */
671 #endif /* !VMG_THREADSAFE */
678 STATIC const MGWIZ *vmg_wizard_mgwiz(pTHX_ const SV *wiz) {
679 #define vmg_wizard_mgwiz(W) vmg_wizard_mgwiz(aTHX_ ((const SV *) (W)))
682 w = vmg_wizard_main_mgwiz(wiz);
683 if (w->owner == aTHX)
688 return VOID2(const MGWIZ *, ptable_fetch(MY_CXT.wizards, w));
692 #else /* VMG_THREADSAFE */
694 #define vmg_wizard_mgwiz(W) vmg_wizard_main_mgwiz(W)
696 #endif /* !VMG_THREADSAFE */
698 /* --- User-level functions implementation --------------------------------- */
700 STATIC const MAGIC *vmg_find(const SV *sv, const SV *wiz) {
701 const MAGIC *mg, *moremagic;
704 if (SvTYPE(sv) < SVt_PVMG)
707 wid = vmg_wizard_id(wiz);
708 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
709 moremagic = mg->mg_moremagic;
710 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
711 IV zid = vmg_wizard_id(mg->mg_ptr);
720 /* ... Construct private data .............................................. */
722 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv, SV **args, I32 items) {
723 #define vmg_data_new(C, S, A, I) vmg_data_new(aTHX_ (C), (S), (A), (I))
733 EXTEND(SP, items + 1);
734 PUSHs(sv_2mortal(newRV_inc(sv)));
735 for (i = 0; i < items; ++i)
739 vmg_call_sv(ctor, G_SCALAR, 0);
743 #if VMG_HAS_PERL(5, 8, 3)
744 SvREFCNT_inc_simple_void(nsv); /* Or it will be destroyed in FREETMPS */
746 nsv = sv_newref(nsv); /* Workaround some bug in SvREFCNT_inc() */
756 STATIC SV *vmg_data_get(pTHX_ SV *sv, const SV *wiz) {
757 #define vmg_data_get(S, W) vmg_data_get(aTHX_ (S), (W))
758 const MAGIC *mg = vmg_find(sv, wiz);
759 return mg ? mg->mg_obj : NULL;
762 /* ... Magic cast/dispell .................................................. */
765 STATIC I32 vmg_svt_val(pTHX_ IV, SV *);
767 STATIC void vmg_uvar_del(SV *sv, MAGIC *prevmagic, MAGIC *mg, MAGIC *moremagic) {
769 prevmagic->mg_moremagic = moremagic;
771 SvMAGIC_set(sv, moremagic);
773 mg->mg_moremagic = NULL;
774 Safefree(mg->mg_ptr);
777 #endif /* VMG_UVAR */
779 STATIC UV vmg_cast(pTHX_ SV *sv, const SV *wiz, SV **args, I32 items) {
780 #define vmg_cast(S, W, A, I) vmg_cast(aTHX_ (S), (W), (A), (I))
786 if (vmg_find(sv, wiz))
789 w = vmg_wizard_mgwiz(wiz);
790 oldgmg = SvGMAGICAL(sv);
792 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv, args, items) : NULL;
793 /* sv_magicext() calls mg_magical and increments data's refcount */
794 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl,
795 (const char *) wiz, HEf_SVKEY);
797 mg->mg_private = SIG_WIZ;
799 mg->mg_flags |= MGf_COPY;
802 mg->mg_flags |= MGf_DUP;
806 mg->mg_flags |= MGf_LOCAL;
807 #endif /* MGf_LOCAL */
809 if (SvTYPE(sv) < SVt_PVHV)
812 /* The GMAGICAL flag only says that a hash is tied or has uvar magic - get
813 * magic is actually never called for them. If the GMAGICAL flag was off before
814 * calling sv_magicext(), the hash isn't tied and has no uvar magic. If it's
815 * now on, then this wizard has get magic. Hence we can work around the
816 * get/clear shortcoming by turning the GMAGICAL flag off. If the current magic
817 * has uvar callbacks, it will be turned back on later. */
818 if (!oldgmg && SvGMAGICAL(sv))
823 MAGIC *prevmagic, *moremagic = NULL;
826 uf[0].uf_val = vmg_svt_val;
833 /* One uvar magic in the chain is enough. */
834 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
835 moremagic = mg->mg_moremagic;
836 if (mg->mg_type == PERL_MAGIC_uvar)
840 if (mg) { /* Found another uvar magic. */
841 struct ufuncs *olduf = (struct ufuncs *) mg->mg_ptr;
842 if (olduf->uf_val == vmg_svt_val) {
843 /* It's our uvar magic, nothing to do. oldgmg was true. */
846 /* It's another uvar magic, backup it and replace it by ours. */
848 vmg_uvar_del(sv, prevmagic, mg, moremagic);
852 sv_magic(sv, NULL, PERL_MAGIC_uvar, (const char *) &uf, sizeof(uf));
854 /* Our hash now carries uvar magic. The uvar/clear shortcoming has to be
855 * handled by our uvar callback. */
857 #endif /* VMG_UVAR */
863 STATIC UV vmg_dispell(pTHX_ SV *sv, const SV *wiz) {
864 #define vmg_dispell(S, W) vmg_dispell(aTHX_ (S), (W))
867 #endif /* VMG_UVAR */
868 MAGIC *mg, *prevmagic, *moremagic = NULL;
869 IV wid = vmg_wizard_id(wiz);
871 if (SvTYPE(sv) < SVt_PVMG)
874 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
875 moremagic = mg->mg_moremagic;
876 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
878 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
879 #endif /* VMG_UVAR */
880 IV zid = vmg_wizard_id(mg->mg_ptr);
883 /* If the current has no uvar, short-circuit uvar deletion. */
884 uvars = z->uvar ? (uvars + 1) : 0;
885 #endif /* VMG_UVAR */
888 } else if (z->uvar) {
890 /* We can't break here since we need to find the ext magic to delete. */
891 #endif /* VMG_UVAR */
899 prevmagic->mg_moremagic = moremagic;
901 SvMAGIC_set(sv, moremagic);
903 mg->mg_moremagic = NULL;
905 /* Destroy private data */
906 if (mg->mg_obj != sv)
907 SvREFCNT_dec(mg->mg_obj);
908 /* Unreference the wizard */
909 SvREFCNT_dec((SV *) mg->mg_ptr);
913 if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
914 /* mg was the first ext magic in the chain that had uvar */
916 for (mg = moremagic; mg; mg = mg->mg_moremagic) {
917 if (mg->mg_type == PERL_MAGIC_ext && mg->mg_private == SIG_WIZ) {
918 const MGWIZ *z = vmg_wizard_mgwiz(mg->mg_ptr);
928 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
929 moremagic = mg->mg_moremagic;
930 if (mg->mg_type == PERL_MAGIC_uvar)
934 uf = (struct ufuncs *) mg->mg_ptr;
935 /* assert(uf->uf_val == vmg_svt_val); */
936 if (uf[1].uf_val || uf[1].uf_set) {
937 /* Revert the original uvar magic. */
939 Renew(uf, 1, struct ufuncs);
940 mg->mg_ptr = (char *) uf;
941 mg->mg_len = sizeof(struct ufuncs);
943 /* Remove the uvar magic. */
944 vmg_uvar_del(sv, prevmagic, mg, moremagic);
948 #endif /* VMG_UVAR */
955 /* ... OP info ............................................................. */
957 #define VMG_OP_INFO_NAME 1
958 #define VMG_OP_INFO_OBJECT 2
961 STATIC perl_mutex vmg_op_name_init_mutex;
964 STATIC U32 vmg_op_name_init = 0;
965 STATIC unsigned char vmg_op_name_len[MAXO] = { 0 };
967 STATIC void vmg_op_info_init(pTHX_ unsigned int opinfo) {
968 #define vmg_op_info_init(W) vmg_op_info_init(aTHX_ (W))
970 case VMG_OP_INFO_NAME:
972 MUTEX_LOCK(&vmg_op_name_init_mutex);
974 if (!vmg_op_name_init) {
976 for (t = 0; t < OP_max; ++t)
977 vmg_op_name_len[t] = strlen(PL_op_name[t]);
978 vmg_op_name_init = 1;
981 MUTEX_UNLOCK(&vmg_op_name_init_mutex);
984 case VMG_OP_INFO_OBJECT: {
986 if (!MY_CXT.b__op_stashes[0]) {
989 for (c = OPc_NULL; c < OPc_MAX; ++c)
990 MY_CXT.b__op_stashes[c] = gv_stashpv(vmg_opclassnames[c], 1);
999 STATIC SV *vmg_op_info(pTHX_ unsigned int opinfo) {
1000 #define vmg_op_info(W) vmg_op_info(aTHX_ (W))
1002 return &PL_sv_undef;
1005 case VMG_OP_INFO_NAME: {
1006 OPCODE t = PL_op->op_type;
1007 return sv_2mortal(newSVpvn(PL_op_name[t], vmg_op_name_len[t]));
1009 case VMG_OP_INFO_OBJECT: {
1011 return sv_bless(sv_2mortal(newRV_noinc(newSViv(PTR2IV(PL_op)))),
1012 MY_CXT.b__op_stashes[vmg_opclass(PL_op)]);
1018 return &PL_sv_undef;
1021 /* ... svt callbacks ....................................................... */
1023 #define VMG_CB_CALL_ARGS_MASK 15
1024 #define VMG_CB_CALL_ARGS_SHIFT 4
1025 #define VMG_CB_CALL_OPINFO (VMG_OP_INFO_NAME|VMG_OP_INFO_OBJECT)
1027 STATIC int vmg_cb_call(pTHX_ SV *cb, unsigned int flags, SV *sv, ...) {
1030 unsigned int i, args, opinfo;
1035 args = flags & VMG_CB_CALL_ARGS_MASK;
1036 flags >>= VMG_CB_CALL_ARGS_SHIFT;
1037 opinfo = flags & VMG_CB_CALL_OPINFO;
1043 EXTEND(SP, args + 1);
1044 PUSHs(sv_2mortal(newRV_inc(sv)));
1046 for (i = 0; i < args; ++i) {
1047 SV *sva = va_arg(ap, SV *);
1048 PUSHs(sva ? sva : &PL_sv_undef);
1052 XPUSHs(vmg_op_info(opinfo));
1055 vmg_call_sv(cb, G_SCALAR, 0);
1060 ret = (int) SvIV(svr);
1069 #define VMG_CB_FLAGS(OI, A) \
1070 ((((unsigned int) (OI)) << VMG_CB_CALL_ARGS_SHIFT) | (A))
1072 #define vmg_cb_call1(I, OI, S, A1) \
1073 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 1), (S), (A1))
1074 #define vmg_cb_call2(I, OI, S, A1, A2) \
1075 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 2), (S), (A1), (A2))
1076 #define vmg_cb_call3(I, OI, S, A1, A2, A3) \
1077 vmg_cb_call(aTHX_ (I), VMG_CB_FLAGS((OI), 3), (S), (A1), (A2), (A3))
1079 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
1080 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1081 return vmg_cb_call1(w->cb_get, w->opinfo, sv, mg->mg_obj);
1084 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
1085 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1086 return vmg_cb_call1(w->cb_set, w->opinfo, sv, mg->mg_obj);
1089 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
1090 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1091 unsigned int opinfo = w->opinfo;
1094 svtype t = SvTYPE(sv);
1103 PUSHs(sv_2mortal(newRV_inc(sv)));
1104 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1107 #if VMG_HAS_PERL(5, 9, 3)
1108 const U8 *s = VOID2(const U8 *, VOID2(const void *, SvPV_const(sv, l)));
1110 U8 *s = SvPV(sv, l);
1113 len = utf8_length(s, s + l);
1117 } else if (t == SVt_PVAV) {
1118 len = av_len((AV *) sv) + 1;
1122 PUSHs(&PL_sv_undef);
1125 XPUSHs(vmg_op_info(opinfo));
1128 vmg_call_sv(w->cb_len, G_SCALAR, 0);
1132 ret = SvOK(svr) ? (U32) SvUV(svr) : len;
1143 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
1144 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1145 return vmg_cb_call1(w->cb_clear, w->opinfo, sv, mg->mg_obj);
1148 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
1155 /* Don't even bother if we are in global destruction - the wizard is prisoner
1156 * of circular references and we are way beyond user realm */
1160 w = vmg_wizard_mgwiz(mg->mg_ptr);
1162 /* So that it survives the temp cleanup below */
1163 SvREFCNT_inc_simple_void(sv);
1165 #if !(VMG_HAS_PERL_MAINT(5, 11, 0, 32686) || VMG_HAS_PERL(5, 12, 0))
1166 /* The previous magic tokens were freed but the magic chain wasn't updated, so
1167 * if you access the sv from the callback the old deleted magics will trigger
1168 * and cause memory misreads. Change 32686 solved it that way : */
1169 SvMAGIC_set(sv, mg);
1177 PUSHs(sv_2mortal(newRV_inc(sv)));
1178 PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
1180 XPUSHs(vmg_op_info(w->opinfo));
1183 vmg_call_sv(w->cb_free, G_SCALAR, 1);
1188 ret = (int) SvIV(svr);
1194 /* Calling SvREFCNT_dec() will trigger destructors in an infinite loop, so
1195 * we have to rely on SvREFCNT() being a lvalue. Heck, even the core does it */
1198 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
1199 * mg->mg_ptr reference count */
1203 STATIC int vmg_svt_copy(pTHX_ SV *sv, MAGIC *mg, SV *nsv, const char *key,
1204 # if VMG_HAS_PERL_MAINT(5, 11, 0, 33256) || VMG_HAS_PERL(5, 12, 0)
1211 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1214 if (keylen == HEf_SVKEY) {
1217 keysv = newSVpvn(key, keylen);
1220 ret = vmg_cb_call3(w->cb_copy, w->opinfo, sv, mg->mg_obj, keysv, nsv);
1222 if (keylen != HEf_SVKEY) {
1223 SvREFCNT_dec(keysv);
1230 STATIC int vmg_svt_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param) {
1236 STATIC int vmg_svt_local(pTHX_ SV *nsv, MAGIC *mg) {
1237 const MGWIZ *w = vmg_wizard_mgwiz(mg->mg_ptr);
1238 return vmg_cb_call1(w->cb_local, w->opinfo, nsv, mg->mg_obj);
1240 #endif /* MGf_LOCAL */
1243 STATIC OP *vmg_pp_resetuvar(pTHX) {
1244 SvRMAGICAL_on(cSVOP_sv);
1248 STATIC I32 vmg_svt_val(pTHX_ IV action, SV *sv) {
1251 SV *key = NULL, *newkey = NULL;
1254 umg = mg_find(sv, PERL_MAGIC_uvar);
1255 /* umg can't be NULL or we wouldn't be there. */
1257 uf = (struct ufuncs *) umg->mg_ptr;
1260 uf[1].uf_val(aTHX_ action, sv);
1262 uf[1].uf_set(aTHX_ action, sv);
1264 action &= HV_FETCH_ISSTORE | HV_FETCH_ISEXISTS | HV_FETCH_LVALUE | HV_DELETE;
1265 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
1267 switch (mg->mg_type) {
1268 case PERL_MAGIC_ext:
1270 case PERL_MAGIC_tied:
1276 if (mg->mg_private != SIG_WIZ) continue;
1277 w = vmg_wizard_mgwiz(mg->mg_ptr);
1283 newkey = key = umg->mg_obj = sv_mortalcopy(umg->mg_obj);
1288 vmg_cb_call2(w->cb_fetch, w->opinfo, sv, mg->mg_obj, key);
1290 case HV_FETCH_ISSTORE:
1291 case HV_FETCH_LVALUE:
1292 case (HV_FETCH_ISSTORE|HV_FETCH_LVALUE):
1294 vmg_cb_call2(w->cb_store, w->opinfo, sv, mg->mg_obj, key);
1296 case HV_FETCH_ISEXISTS:
1298 vmg_cb_call2(w->cb_exists, w->opinfo, sv, mg->mg_obj, key);
1302 vmg_cb_call2(w->cb_delete, w->opinfo, sv, mg->mg_obj, key);
1307 if (SvRMAGICAL(sv) && !tied) {
1308 /* Temporarily hide the RMAGICAL flag of the hash so it isn't wrongly
1309 * mistaken for a tied hash by the rest of hv_common. It will be reset by
1310 * the op_ppaddr of a new fake op injected between the current and the next
1313 if (!o->op_next || o->op_next->op_ppaddr != vmg_pp_resetuvar) {
1315 NewOp(1101, svop, 1, SVOP);
1316 svop->op_type = OP_STUB;
1317 svop->op_ppaddr = vmg_pp_resetuvar;
1318 svop->op_next = o->op_next;
1321 o->op_next = (OP *) svop;
1328 #endif /* VMG_UVAR */
1330 /* --- Macros for the XS section ------------------------------------------- */
1332 #define VMG_SET_CB(S, N) \
1334 w->cb_ ## N = (SvOK(cb) && SvROK(cb)) ? SvREFCNT_inc(SvRV(cb)) : NULL;
1336 #define VMG_SET_SVT_CB(S, N) \
1338 if (SvOK(cb) && SvROK(cb)) { \
1339 t->svt_ ## N = vmg_svt_ ## N; \
1340 w->cb_ ## N = SvREFCNT_inc(SvRV(cb)); \
1342 t->svt_ ## N = NULL; \
1343 w->cb_ ## N = NULL; \
1348 STATIC void vmg_cleanup(pTHX_ void *ud) {
1351 ptable_free(MY_CXT.wizards);
1352 MY_CXT.wizards = NULL;
1355 #endif /* VMG_THREADSAFE */
1357 /* --- XS ------------------------------------------------------------------ */
1359 MODULE = Variable::Magic PACKAGE = Variable::Magic
1369 MY_CXT.wizards = ptable_new();
1370 MY_CXT.owner = aTHX;
1372 MY_CXT.b__op_stashes[0] = NULL;
1374 MUTEX_INIT(&vmg_op_name_init_mutex);
1375 call_atexit(vmg_cleanup, NULL);
1378 stash = gv_stashpv(__PACKAGE__, 1);
1379 newCONSTSUB(stash, "MGf_COPY", newSVuv(MGf_COPY));
1380 newCONSTSUB(stash, "MGf_DUP", newSVuv(MGf_DUP));
1381 newCONSTSUB(stash, "MGf_LOCAL", newSVuv(MGf_LOCAL));
1382 newCONSTSUB(stash, "VMG_UVAR", newSVuv(VMG_UVAR));
1383 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN",
1384 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN));
1385 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID",
1386 newSVuv(VMG_COMPAT_ARRAY_PUSH_NOLEN_VOID));
1387 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID",
1388 newSVuv(VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID));
1389 newCONSTSUB(stash, "VMG_COMPAT_ARRAY_UNDEF_CLEAR",
1390 newSVuv(VMG_COMPAT_ARRAY_UNDEF_CLEAR));
1391 newCONSTSUB(stash, "VMG_COMPAT_SCALAR_LENGTH_NOLEN",
1392 newSVuv(VMG_COMPAT_SCALAR_LENGTH_NOLEN));
1393 newCONSTSUB(stash, "VMG_COMPAT_GLOB_GET", newSVuv(VMG_COMPAT_GLOB_GET));
1394 newCONSTSUB(stash, "VMG_PERL_PATCHLEVEL", newSVuv(VMG_PERL_PATCHLEVEL));
1395 newCONSTSUB(stash, "VMG_THREADSAFE", newSVuv(VMG_THREADSAFE));
1396 newCONSTSUB(stash, "VMG_FORKSAFE", newSVuv(VMG_FORKSAFE));
1397 newCONSTSUB(stash, "VMG_OP_INFO_NAME", newSVuv(VMG_OP_INFO_NAME));
1398 newCONSTSUB(stash, "VMG_OP_INFO_OBJECT", newSVuv(VMG_OP_INFO_OBJECT));
1408 U32 had_b__op_stash = 0;
1415 ud.wizards = t = ptable_new();
1416 ud.owner = MY_CXT.owner;
1417 ptable_walk(MY_CXT.wizards, vmg_ptable_clone, &ud);
1419 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1420 if (MY_CXT.b__op_stashes[c])
1421 had_b__op_stash |= (((U32) 1) << c);
1427 MY_CXT.owner = aTHX;
1428 for (c = OPc_NULL; c < OPc_MAX; ++c) {
1429 MY_CXT.b__op_stashes[c] = (had_b__op_stash & (((U32) 1) << c))
1430 ? gv_stashpv(vmg_opclassnames[c], 1) : NULL;
1435 #endif /* VMG_THREADSAFE */
1443 SV *cb, *op_info, *copy_key;
1450 #endif /* MGf_LOCAL */
1453 #endif /* VMG_UVAR */
1454 ) { croak(vmg_wrongargnum); }
1457 w = vmg_mgwiz_alloc(SvOK(op_info) ? SvUV(op_info) : 0);
1460 VMG_SET_CB(ST(i++), data);
1462 VMG_SET_SVT_CB(ST(i++), get);
1463 VMG_SET_SVT_CB(ST(i++), set);
1464 VMG_SET_SVT_CB(ST(i++), len);
1465 VMG_SET_SVT_CB(ST(i++), clear);
1466 VMG_SET_SVT_CB(ST(i++), free);
1467 VMG_SET_SVT_CB(ST(i++), copy);
1468 /* VMG_SET_SVT_CB(ST(i++), dup); */
1473 VMG_SET_SVT_CB(ST(i++), local);
1474 #endif /* MGf_LOCAL */
1476 VMG_SET_CB(ST(i++), fetch);
1477 VMG_SET_CB(ST(i++), store);
1478 VMG_SET_CB(ST(i++), exists);
1479 VMG_SET_CB(ST(i++), delete);
1482 if (w->cb_fetch || w->cb_store || w->cb_exists || w->cb_delete)
1483 w->uvar = SvTRUE(copy_key) ? 2 : 1;
1484 #endif /* VMG_UVAR */
1485 #if VMG_MULTIPLICITY
1487 #endif /* VMG_MULTIPLICITY */
1489 ptable_store(MY_CXT.wizards, w, w);
1490 #endif /* VMG_THREADSAFE */
1492 RETVAL = newRV_noinc(vmg_wizard_new(w));
1496 SV *cast(SV *sv, SV *wiz, ...)
1497 PROTOTYPE: \[$@%&*]$@
1506 RETVAL = newSVuv(vmg_cast(SvRV(sv), vmg_wizard_validate(wiz), args, i));
1511 getdata(SV *sv, SV *wiz)
1512 PROTOTYPE: \[$@%&*]$
1516 data = vmg_data_get(SvRV(sv), vmg_wizard_validate(wiz));
1522 SV *dispell(SV *sv, SV *wiz)
1523 PROTOTYPE: \[$@%&*]$
1525 RETVAL = newSVuv(vmg_dispell(SvRV(sv), vmg_wizard_validate(wiz)));