1 #define PERL_NO_GET_CONTEXT
6 #define SIG_WIZ ((U16) (1u << 8 - 1))
8 #define R(S) fprintf(stderr, "R(" #S ") = %d\n", SvREFCNT(sv))
13 SV *cb_get, *cb_set, *cb_len, *cb_clear, *cb_free, *cb_data;
16 #define MGWIZ2SV(W) (newSVuv(PTR2UV(W)))
17 #define SV2MGWIZ(S) (INT2PTR(MGWIZ*, SvUVX((SV *) (S))))
19 /* ... Construct private data .............................................. */
21 STATIC SV *vmg_data_new(pTHX_ SV *ctor, SV *sv) {
22 #define vmg_data_new(C, S) vmg_data_new(aTHX_ (C), (S))
35 count = call_sv(ctor, G_SCALAR);
39 if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
41 SvREFCNT_inc(nsv); /* Or it will be destroyed in FREETMPS */
51 STATIC SV *vmg_data_get(SV *sv, U16 sig) {
52 MAGIC *mg, *moremagic;
55 if (SvTYPE(sv) >= SVt_PVMG) {
56 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
57 moremagic = mg->mg_moremagic;
58 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == sig)) { break; }
60 if (mg) { return mg->mg_obj; }
66 /* ... Magic cast/dispell .................................................. */
68 STATIC UV vmg_cast(pTHX_ SV *sv, SV *wiz) {
69 #define vmg_cast(S, W) vmg_cast(aTHX_ (S), (W))
70 MAGIC *mg = NULL, *moremagic = NULL;
76 if (SvTYPE(sv) >= SVt_PVMG) {
77 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
78 moremagic = mg->mg_moremagic;
79 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == w->sig)) { break; }
84 data = (w->cb_data) ? vmg_data_new(w->cb_data, sv) : NULL;
85 mg = sv_magicext(sv, data, PERL_MAGIC_ext, w->vtbl,
86 (const char *) wiz, HEf_SVKEY);
87 mg->mg_private = w->sig;
92 STATIC UV vmg_dispell(pTHX_ SV *sv, U16 sig) {
93 #define vmg_dispell(S, Z) vmg_dispell(aTHX_ (S), (Z))
94 MAGIC *mg, *prevmagic, *moremagic = NULL;
97 if (SvTYPE(sv) < SVt_PVMG) { return 0; }
99 for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic) {
100 moremagic = mg->mg_moremagic;
101 if ((mg->mg_type == PERL_MAGIC_ext) && (mg->mg_private == sig)) { break; }
103 if (!mg) { return 0; }
106 prevmagic->mg_moremagic = moremagic;
108 SvMAGIC_set(sv, moremagic);
110 mg->mg_moremagic = NULL;
112 if (mg->mg_obj != sv) { SvREFCNT_dec(mg->mg_obj); } /* Destroy private data */
113 SvREFCNT_dec((SV *) mg->mg_ptr); /* Unreference the wizard */
119 /* ... svt callbacks ....................................................... */
121 STATIC int vmg_cb_call(pTHX_ SV *cb, SV *sv, SV *data) {
122 #define vmg_cb_call(I, S, D) vmg_cb_call(aTHX_ (I), (S), (D))
132 switch (SvTYPE(sv)) {
134 case SVt_PVHV: XPUSHs(sv_2mortal(newRV_inc(sv))); break;
137 if (data) { XPUSHs(data); }
140 count = call_sv(cb, G_SCALAR);
144 if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
155 STATIC int vmg_svt_get(pTHX_ SV *sv, MAGIC *mg) {
156 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_get, sv, mg->mg_obj);
159 STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
160 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_set, sv, mg->mg_obj);
163 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
173 switch (SvTYPE(sv)) {
175 case SVt_PVHV: XPUSHs(sv_2mortal(newRV_inc(sv))); break;
178 XPUSHs((mg->mg_obj) ? (mg->mg_obj) : &PL_sv_undef);
179 if (SvTYPE(sv) == SVt_PVAV) {
180 XPUSHs(sv_2mortal(newSViv(av_len((AV *) sv) + 1)));
184 count = call_sv(SV2MGWIZ(mg->mg_ptr)->cb_len, G_SCALAR);
188 if (count != 1) { croak("Callback needs to return 1 scalar\n"); }
199 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {
200 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_clear, sv, mg->mg_obj);
203 STATIC int vmg_svt_free(pTHX_ SV *sv, MAGIC *mg) {
204 /* So that it can survive tmp cleanup in vmg_cb_call */
205 if (SvREFCNT(sv) <= 0) { SvREFCNT_inc(sv); }
206 /* Perl_mg_free will get rid of the magic and decrement mg->mg_obj and
207 * mg->mg_ptr reference count */
208 return vmg_cb_call(SV2MGWIZ(mg->mg_ptr)->cb_free, sv, mg->mg_obj);
211 /* ... Wizard destructor ................................................... */
213 STATIC int vmg_wizard_free(pTHX_ SV *wiz, MAGIC *mg) {
214 MGWIZ *w = SV2MGWIZ(wiz);
216 if (w->cb_get != NULL) { SvREFCNT_dec(SvRV(w->cb_get)); }
217 if (w->cb_set != NULL) { SvREFCNT_dec(SvRV(w->cb_set)); }
218 if (w->cb_len != NULL) { SvREFCNT_dec(SvRV(w->cb_len)); }
219 if (w->cb_clear != NULL) { SvREFCNT_dec(SvRV(w->cb_clear)); }
220 if (w->cb_free != NULL) { SvREFCNT_dec(SvRV(w->cb_free)); }
221 if (w->cb_data != NULL) { SvREFCNT_dec(SvRV(w->cb_data)); }
228 STATIC MGVTBL vmg_wizard_vtbl = {
233 vmg_wizard_free, /* free */
236 #endif /* MGf_COPY */
242 STATIC const char vmg_invalid_wiz[] = "Invalid wizard object";
243 STATIC const char vmg_invalid_sv[] = "Invalid variable";
244 STATIC const char vmg_invalid_sig[] = "Invalid numeric signature";
246 /* --- XS ------------------------------------------------------------------ */
248 MODULE = Variable::Magic PACKAGE = Variable::Magic
252 SV *_wizard(SV *sig, SV *cb_get, SV *cb_set, SV *cb_len, SV *cb_clear, SV *cb_free, SV *cb_data)
260 if (!SvIOK(sig)) { croak(vmg_invalid_sig); }
263 t->svt_get = (SvOK(cb_get)) ? vmg_svt_get : NULL;
264 t->svt_set = (SvOK(cb_set)) ? vmg_svt_set : NULL;
265 t->svt_len = (SvOK(cb_len)) ? vmg_svt_len : NULL;
266 t->svt_clear = (SvOK(cb_clear)) ? vmg_svt_clear : NULL;
267 t->svt_free = (SvOK(cb_free)) ? vmg_svt_free : NULL;
270 #endif /* MGf_COPY */
278 w->cb_get = (SvROK(cb_get)) ? newRV_inc(SvRV(cb_get)) : NULL;
279 w->cb_set = (SvROK(cb_set)) ? newRV_inc(SvRV(cb_set)) : NULL;
280 w->cb_len = (SvROK(cb_len)) ? newRV_inc(SvRV(cb_len)) : NULL;
281 w->cb_clear = (SvROK(cb_clear)) ? newRV_inc(SvRV(cb_clear)) : NULL;
282 w->cb_free = (SvROK(cb_free)) ? newRV_inc(SvRV(cb_free)) : NULL;
283 w->cb_data = (SvROK(cb_data)) ? newRV_inc(SvRV(cb_data)) : NULL;
286 mg = sv_magicext(sv, NULL, PERL_MAGIC_ext, &vmg_wizard_vtbl, NULL, -1);
287 mg->mg_private = SIG_WIZ;
289 RETVAL = newRV_noinc(sv);
296 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
297 RETVAL = newSVuv(SV2MGWIZ(SvRV(wiz))->sig);
301 SV *cast(SV *sv, SV *wiz)
304 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
305 RETVAL = newSVuv(vmg_cast(SvRV(sv), SvRV(wiz)));
309 SV *getdata(SV *sv, SV *wiz)
314 if (!SvROK(wiz)) { croak(vmg_invalid_wiz); }
315 data = vmg_data_get(SvRV(sv), SV2MGWIZ(SvRV(wiz))->sig);
316 if (!data) { XSRETURN_UNDEF; }
317 ST(0) = newSVsv(data);
320 SV *dispell(SV *sv, SV *wiz)
326 sig = SV2MGWIZ(SvRV(wiz))->sig;
327 } else if (SvIOK(wiz)) {
330 croak(vmg_invalid_wiz);
332 RETVAL = newSVuv(vmg_dispell(SvRV(sv), sig));