1 #define PERL_NO_GET_CONTEXT
6 /* --- Compatibility ------------------------------------------------------- */
9 # define Newx(v, n, c) New(0, v, n, c)
13 # define SvMAGIC_set(sv, val) (SvMAGIC(sv) = (val))
16 #define SIG_WIZ ((U16) (1u << 8 - 1))
18 #define R(S) fprintf(stderr, "R(" #S ") = %d\n", SvREFCNT(sv))
23 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free, *cb_data;
26 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
27 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
29 /* ... Construct private data .............................................. */
31 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv) {
32 #define vmg_data_new(C, S) vmg_data_new(aTHX_ (C), (S))
45 count = call_sv(ctor, G_SCALAR);
49 if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
51 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
61 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
62 MAGIC *mg, *moremagic;
65 if (SvTYPE(sv) >= SVt_PVMG) {
66 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
67 moremagic = mg->mg_moremagic;
68 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == sig)) { break; }
70 if (mg) { return mg->mg_obj; }
76 /* ... Magic cast/dispell .................................................. */
78 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz) {
79 #define vmg_cast(S, W) vmg_cast(aTHX_ (S), (W))
80 MAGIC *mg = NULL, *moremagic = NULL;
86 if (SvTYPE(sv) >= SVt_PVMG) {
87 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
88 moremagic = mg->mg_moremagic;
89 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == w->sig)) { break; }
94 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv) : NULL;
95 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl,
96 (const char *) wiz, HEf_SVKEY);
97 mg->mg_private = w->sig;
102 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
103 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
104 MAGIC *mg, *prevmagic, *moremagic = NULL;
107 if (SvTYPE(sv) < SVt_PVMG) { return 0; }
109 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
110 moremagic = mg->mg_moremagic;
111 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == sig)) { break; }
113 if (!mg) { return 0; }
116 prevmagic->mg_moremagic = moremagic;
118 SvMAGIC_set(sv, moremagic);
120 mg->mg_moremagic = NULL;
122 if (mg->mg_obj != sv) { SvREFCNT_dec(mg->mg_obj); } /* Destroy private data */
123 SvREFCNT_dec((SV *) mg->mg_ptr); /* Unreference the wizard */
129 /* ... svt callbacks ....................................................... */
131 STATIC int vmg_cb_call(pTHX_ SV *cb, SV *sv, SV *data) {
132 #define vmg_cb_call(I, S, D) vmg_cb_call(aTHX_ (I), (S), (D))
142 switch (SvTYPE(sv)) {
144 case SVt_PVHV: XPUSHs(sv_2mortal(newRV_inc(sv))); break;
147 if (data) { XPUSHs(data); }
150 count = call_sv(cb, G_SCALAR);
154 if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
165 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
166 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_get, sv, mg->mg_obj);
169 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
170 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_set, sv, mg->mg_obj);
173 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
183 switch (SvTYPE(sv)) {
185 case SVt_PVHV: XPUSHs(sv_2mortal(newRV_inc(sv))); break;
188 XPUSHs((mg->mg_obj) ? (mg->mg_obj) : &PL_sv_undef);
189 if (SvTYPE(sv) == SVt_PVAV) {
190 XPUSHs(sv_2mortal(newSViv(av_len((AV *) sv) + 1)));
194 count = call_sv(SV2MGWIZ(mg->mg_ptr)->cb_len, G_SCALAR);
198 if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
209 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
210 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_clear, sv, mg->mg_obj);
213 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
214 /* So that it can survive tmp cleanup in vmg_cb_call */
215 if (SvREFCNT(sv) <= 0) { SvREFCNT_inc(sv); }
216 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
217 * mg->mg_ptr reference count */
218 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_free, sv, mg->mg_obj);
221 /* ... Wizard destructor ................................................... */
223 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
224 MGWIZ *w = SV2MGWIZ(wiz);
226 if (w->cb_get != NULL) { SvREFCNT_dec(SvRV(w->cb_get)); }
227 if (w->cb_set != NULL) { SvREFCNT_dec(SvRV(w->cb_set)); }
228 if (w->cb_len != NULL) { SvREFCNT_dec(SvRV(w->cb_len)); }
229 if (w->cb_clear != NULL) { SvREFCNT_dec(SvRV(w->cb_clear)); }
230 if (w->cb_free != NULL) { SvREFCNT_dec(SvRV(w->cb_free)); }
231 if (w->cb_data != NULL) { SvREFCNT_dec(SvRV(w->cb_data)); }
238 STATIC MGVTBL vmg_wizard_vtbl = {
243 vmg_wizard_free, /* free */
246 #endif /* MGf_COPY */
252 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
253 STATIC const char vmg_invalid_sv[] = "Invalid variable";
254 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
256 /* --- XS ------------------------------------------------------------------ */
258 MODULE = Variable::Magic PACKAGE = Variable::Magic
262 SV *_wizard(SV *sig, SV *cb_get, SV *cb_set, SV *cb_len, SV *cb_clear, SV *cb_free, SV *cb_data)
270 if (!SvIOK(sig)) { croak(vmg_invalid_sig); }
273 t->svt_get = (SvOK(cb_get)) ? vmg_svt_get : NULL;
274 t->svt_set = (SvOK(cb_set)) ? vmg_svt_set : NULL;
275 t->svt_len = (SvOK(cb_len)) ? vmg_svt_len : NULL;
276 t->svt_clear = (SvOK(cb_clear)) ? vmg_svt_clear : NULL;
277 t->svt_free = (SvOK(cb_free)) ? vmg_svt_free : NULL;
280 #endif /* MGf_COPY */
288 w->cb_get = (SvROK(cb_get)) ? newRV_inc(SvRV(cb_get)) : NULL;
289 w->cb_set = (SvROK(cb_set)) ? newRV_inc(SvRV(cb_set)) : NULL;
290 w->cb_len = (SvROK(cb_len)) ? newRV_inc(SvRV(cb_len)) : NULL;
291 w->cb_clear = (SvROK(cb_clear)) ? newRV_inc(SvRV(cb_clear)) : NULL;
292 w->cb_free = (SvROK(cb_free)) ? newRV_inc(SvRV(cb_free)) : NULL;
293 w->cb_data = (SvROK(cb_data)) ? newRV_inc(SvRV(cb_data)) : NULL;
296 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, -1);
297 mg->mg_private = SIG_WIZ;
299 RETVAL = newRV_noinc(sv);
306 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
307 RETVAL = newSVuv(SV2MGWIZ(SvRV(wiz))->sig);
311 SV *cast(SV *sv, SV *wiz)
314 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
315 RETVAL = newSVuv(vmg_cast(SvRV(sv), SvRV(wiz)));
319 SV *getdata(SV *sv, SV *wiz)
324 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
325 data = vmg_data_get(SvRV(sv), SV2MGWIZ(SvRV(wiz))->sig);
326 if (!data) { XSRETURN_UNDEF; }
327 ST(0) = newSVsv(data);
330 SV *dispell(SV *sv, SV *wiz)
336 sig = SV2MGWIZ(SvRV(wiz))->sig;
337 } else if (SvIOK(wiz)) {
340 croak(vmg_invalid_wiz);
342 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));