Commit | Line | Data |
8995e827 |
1 | |
2 | #include "EXTERN.h" |
3 | #include "perl.h" |
4 | #include "XSUB.h" |
8995e827 |
5 | |
29e61e10 |
6 | /* Most of this code is backported from the bleadperl patch's |
b23e9cb9 |
7 | mro.c, and then modified to work with Class::C3's |
8 | internals. |
9 | */ |
8995e827 |
10 | |
b23e9cb9 |
11 | AV* |
12 | __mro_linear_isa_c3(pTHX_ HV* stash, HV* cache, I32 level) |
13 | { |
14 | AV* retval; |
15 | GV** gvp; |
16 | GV* gv; |
17 | AV* isa; |
18 | const char* stashname; |
19 | STRLEN stashname_len; |
8995e827 |
20 | |
b23e9cb9 |
21 | assert(stash); |
8995e827 |
22 | |
b23e9cb9 |
23 | stashname = HvNAME(stash); |
24 | stashname_len = strlen(stashname); |
25 | if (!stashname) |
26 | Perl_croak(aTHX_ |
27 | "Can't linearize anonymous symbol table"); |
8995e827 |
28 | |
b23e9cb9 |
29 | if (level > 100) |
30 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
31 | stashname); |
8995e827 |
32 | |
b23e9cb9 |
33 | if(!cache) { |
f0294f1b |
34 | cache = (HV*)sv_2mortal((SV*)newHV()); |
b23e9cb9 |
35 | } |
36 | else { |
6bf46d18 |
37 | SV** cache_entry = hv_fetch(cache, stashname, stashname_len, 0); |
38 | if(cache_entry) |
39 | return (AV*)SvREFCNT_inc(*cache_entry); |
b23e9cb9 |
40 | } |
41 | |
42 | /* not in cache, make a new one */ |
43 | |
62eb9d08 |
44 | retval = newAV(); |
b23e9cb9 |
45 | av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */ |
46 | |
47 | gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE); |
48 | isa = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL; |
49 | |
50 | if(isa && AvFILLp(isa) >= 0) { |
51 | SV** seqs_ptr; |
52 | I32 seqs_items; |
53 | HV* tails = (HV*)sv_2mortal((SV*)newHV()); |
54 | AV* seqs = (AV*)sv_2mortal((SV*)newAV()); |
55 | I32 items = AvFILLp(isa) + 1; |
56 | SV** isa_ptr = AvARRAY(isa); |
57 | while(items--) { |
58 | AV* isa_lin; |
59 | SV* isa_item = *isa_ptr++; |
60 | HV* isa_item_stash = gv_stashsv(isa_item, 0); |
61 | if(!isa_item_stash) { |
62 | isa_lin = newAV(); |
63 | av_push(isa_lin, newSVsv(isa_item)); |
64 | } |
65 | else { |
b36f79e1 |
66 | isa_lin = (AV*)sv_2mortal((SV*)__mro_linear_isa_c3(aTHX_ isa_item_stash, cache, level + 1)); /* recursion */ |
b23e9cb9 |
67 | } |
68 | av_push(seqs, (SV*)av_make(AvFILLp(isa_lin)+1, AvARRAY(isa_lin))); |
69 | } |
70 | av_push(seqs, (SV*)av_make(AvFILLp(isa)+1, AvARRAY(isa))); |
71 | |
72 | seqs_ptr = AvARRAY(seqs); |
73 | seqs_items = AvFILLp(seqs) + 1; |
74 | while(seqs_items--) { |
75 | AV* seq = (AV*)*seqs_ptr++; |
76 | I32 seq_items = AvFILLp(seq); |
77 | if(seq_items > 0) { |
78 | SV** seq_ptr = AvARRAY(seq) + 1; |
79 | while(seq_items--) { |
80 | SV* seqitem = *seq_ptr++; |
81 | HE* he = hv_fetch_ent(tails, seqitem, 0, 0); |
82 | if(!he) { |
83 | hv_store_ent(tails, seqitem, newSViv(1), 0); |
84 | } |
85 | else { |
86 | SV* val = HeVAL(he); |
87 | sv_inc(val); |
88 | } |
89 | } |
90 | } |
91 | } |
92 | |
93 | while(1) { |
94 | SV* seqhead = NULL; |
95 | SV* cand = NULL; |
96 | SV* winner = NULL; |
97 | SV* val; |
98 | HE* tail_entry; |
99 | AV* seq; |
100 | SV** avptr = AvARRAY(seqs); |
101 | items = AvFILLp(seqs)+1; |
102 | while(items--) { |
103 | SV** svp; |
104 | seq = (AV*)*avptr++; |
105 | if(AvFILLp(seq) < 0) continue; |
106 | svp = av_fetch(seq, 0, 0); |
107 | seqhead = *svp; |
108 | if(!winner) { |
109 | cand = seqhead; |
110 | if((tail_entry = hv_fetch_ent(tails, cand, 0, 0)) |
111 | && (val = HeVAL(tail_entry)) |
112 | && (SvIVx(val) > 0)) |
113 | continue; |
114 | winner = newSVsv(cand); |
115 | av_push(retval, winner); |
116 | } |
117 | if(!sv_cmp(seqhead, winner)) { |
b34605d0 |
118 | sv_2mortal(av_shift(seq)); |
b23e9cb9 |
119 | if(AvFILLp(seq) < 0) continue; |
120 | svp = av_fetch(seq, 0, 0); |
121 | seqhead = *svp; |
122 | tail_entry = hv_fetch_ent(tails, seqhead, 0, 0); |
123 | val = HeVAL(tail_entry); |
124 | sv_dec(val); |
125 | } |
126 | } |
127 | if(!cand) break; |
62eb9d08 |
128 | if(!winner) { |
129 | SvREFCNT_dec(retval); |
b23e9cb9 |
130 | Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': " |
131 | "merging failed on parent '%s'", stashname, SvPV_nolen(cand)); |
62eb9d08 |
132 | } |
b23e9cb9 |
133 | } |
134 | } |
135 | |
136 | SvREADONLY_on(retval); |
f0294f1b |
137 | hv_store(cache, stashname, stashname_len, (SV*)retval, 0); |
62eb9d08 |
138 | return (AV*)SvREFCNT_inc(retval); |
b23e9cb9 |
139 | } |
140 | |
141 | STATIC I32 |
142 | __dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) { |
143 | I32 i; |
144 | for (i = startingblock; i >= 0; i--) { |
145 | if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i; |
146 | } |
147 | return i; |
148 | } |
149 | |
150 | STATIC SV* |
151 | __nextcan(pTHX_ SV* self, I32 throw_nomethod) |
152 | { |
153 | register I32 cxix; |
154 | register const PERL_CONTEXT *ccstack = cxstack; |
155 | const PERL_SI *top_si = PL_curstackinfo; |
156 | HV* selfstash; |
157 | GV* cvgv; |
158 | SV *stashname; |
159 | const char *fq_subname; |
160 | const char *subname; |
161 | STRLEN fq_subname_len; |
162 | STRLEN stashname_len; |
163 | STRLEN subname_len; |
164 | SV* sv; |
165 | GV** gvp; |
166 | AV* linear_av; |
167 | SV** linear_svp; |
168 | SV* linear_sv; |
169 | HV* cstash; |
170 | GV* candidate = NULL; |
171 | CV* cand_cv = NULL; |
172 | const char *hvname; |
173 | I32 items; |
6c88cc6a |
174 | HV* nmcache; |
b23e9cb9 |
175 | HE* cache_entry; |
22c6f594 |
176 | SV* cachekey; |
b23e9cb9 |
177 | |
178 | if(sv_isobject(self)) |
179 | selfstash = SvSTASH(SvRV(self)); |
180 | else |
181 | selfstash = gv_stashsv(self, 0); |
182 | |
183 | assert(selfstash); |
184 | |
185 | hvname = HvNAME(selfstash); |
186 | if (!hvname) |
625e16df |
187 | Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); |
b23e9cb9 |
188 | |
189 | cxix = __dopoptosub_at(cxstack, cxstack_ix); |
190 | |
191 | /* This block finds the contextually-enclosing fully-qualified subname, |
192 | much like looking at (caller($i))[3] until you find a real sub that |
193 | isn't ANON, etc */ |
194 | for (;;) { |
195 | /* we may be in a higher stacklevel, so dig down deeper */ |
196 | while (cxix < 0) { |
197 | if(top_si->si_type == PERLSI_MAIN) |
625e16df |
198 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method must be used in method context"); |
b23e9cb9 |
199 | top_si = top_si->si_prev; |
200 | ccstack = top_si->si_cxstack; |
201 | cxix = __dopoptosub_at(ccstack, top_si->si_cxix); |
202 | } |
203 | |
204 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB |
205 | || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) { |
206 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
207 | continue; |
208 | } |
209 | |
210 | { |
211 | const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1); |
212 | if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) { |
213 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) { |
214 | cxix = dbcxix; |
215 | continue; |
216 | } |
217 | } |
218 | } |
219 | |
220 | cvgv = CvGV(ccstack[cxix].blk_sub.cv); |
221 | |
222 | if(!isGV(cvgv)) { |
223 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
224 | continue; |
225 | } |
226 | |
227 | /* we found a real sub here */ |
228 | sv = sv_2mortal(newSV(0)); |
229 | |
230 | gv_efullname3(sv, cvgv, NULL); |
231 | |
232 | fq_subname = SvPVX(sv); |
233 | fq_subname_len = SvCUR(sv); |
234 | |
235 | subname = strrchr(fq_subname, ':'); |
236 | if(!subname) |
625e16df |
237 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method"); |
b23e9cb9 |
238 | |
239 | subname++; |
240 | subname_len = fq_subname_len - (subname - fq_subname); |
241 | if(subname_len == 8 && strEQ(subname, "__ANON__")) { |
242 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
243 | continue; |
244 | } |
245 | break; |
246 | } |
247 | |
248 | /* If we made it to here, we found our context */ |
249 | |
22c6f594 |
250 | /* cachekey = "objpkg|context::method::name" */ |
251 | cachekey = sv_2mortal(newSVpv(hvname, 0)); |
252 | sv_catpvn(cachekey, "|", 1); |
253 | sv_catsv(cachekey, sv); |
b23e9cb9 |
254 | |
6c88cc6a |
255 | nmcache = get_hv("next::METHOD_CACHE", 1); |
22c6f594 |
256 | if((cache_entry = hv_fetch_ent(nmcache, cachekey, 0, 0))) { |
b23e9cb9 |
257 | SV* val = HeVAL(cache_entry); |
258 | if(val == &PL_sv_undef) { |
259 | if(throw_nomethod) |
625e16df |
260 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); |
b23e9cb9 |
261 | return &PL_sv_undef; |
262 | } |
263 | return SvREFCNT_inc(val); |
264 | } |
b23e9cb9 |
265 | |
266 | /* beyond here is just for cache misses, so perf isn't as critical */ |
267 | |
268 | stashname_len = subname - fq_subname - 2; |
269 | stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len)); |
270 | |
62eb9d08 |
271 | linear_av = __mro_linear_isa_c3(aTHX_ selfstash, NULL, 0); |
b23e9cb9 |
272 | |
273 | linear_svp = AvARRAY(linear_av); |
274 | items = AvFILLp(linear_av) + 1; |
275 | |
276 | while (items--) { |
277 | linear_sv = *linear_svp++; |
278 | assert(linear_sv); |
279 | if(sv_eq(linear_sv, stashname)) |
280 | break; |
281 | } |
282 | |
283 | if(items > 0) { |
29e61e10 |
284 | SV* sub_sv = sv_2mortal(newSVpv(subname, subname_len)); |
285 | HV* cc3_mro = get_hv("Class::C3::MRO", 0); |
29e61e10 |
286 | |
b23e9cb9 |
287 | while (items--) { |
288 | linear_sv = *linear_svp++; |
289 | assert(linear_sv); |
29e61e10 |
290 | |
291 | if(cc3_mro) { |
292 | HE* he_cc3_mro_class = hv_fetch_ent(cc3_mro, linear_sv, 0, 0); |
293 | if(he_cc3_mro_class) { |
3499e05c |
294 | SV* cc3_mro_class_sv = HeVAL(he_cc3_mro_class); |
295 | if(SvROK(cc3_mro_class_sv)) { |
296 | HV* cc3_mro_class = (HV*)SvRV(cc3_mro_class_sv); |
297 | SV** svp_cc3_mro_class_methods = hv_fetch(cc3_mro_class, "methods", 7, 0); |
298 | if(svp_cc3_mro_class_methods) { |
299 | SV* cc3_mro_class_methods_sv = *svp_cc3_mro_class_methods; |
300 | if(SvROK(cc3_mro_class_methods_sv)) { |
301 | HV* cc3_mro_class_methods = (HV*)SvRV(cc3_mro_class_methods_sv); |
302 | if(hv_exists_ent(cc3_mro_class_methods, sub_sv, 0)) |
303 | continue; |
304 | } |
305 | } |
29e61e10 |
306 | } |
307 | } |
308 | } |
309 | |
b23e9cb9 |
310 | cstash = gv_stashsv(linear_sv, FALSE); |
311 | |
312 | if (!cstash) { |
313 | if (ckWARN(WARN_MISC)) |
314 | Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA", |
315 | (void*)linear_sv, hvname); |
316 | continue; |
317 | } |
318 | |
319 | assert(cstash); |
320 | |
b23e9cb9 |
321 | gvp = (GV**)hv_fetch(cstash, subname, subname_len, 0); |
322 | if (!gvp) continue; |
323 | |
324 | candidate = *gvp; |
325 | assert(candidate); |
326 | |
327 | if (SvTYPE(candidate) != SVt_PVGV) |
328 | gv_init(candidate, cstash, subname, subname_len, TRUE); |
329 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { |
62eb9d08 |
330 | SvREFCNT_dec(linear_av); |
b23e9cb9 |
331 | SvREFCNT_inc((SV*)cand_cv); |
22c6f594 |
332 | hv_store_ent(nmcache, newSVsv(cachekey), (SV*)cand_cv, 0); |
b23e9cb9 |
333 | return (SV*)cand_cv; |
334 | } |
335 | } |
336 | } |
337 | |
62eb9d08 |
338 | SvREFCNT_dec(linear_av); |
22c6f594 |
339 | hv_store_ent(nmcache, newSVsv(cachekey), &PL_sv_undef, 0); |
b23e9cb9 |
340 | if(throw_nomethod) |
625e16df |
341 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); |
b23e9cb9 |
342 | return &PL_sv_undef; |
343 | } |
344 | |
345 | XS(XS_Class_C3_XS_calculateMRO); |
346 | XS(XS_Class_C3_XS_calculateMRO) |
347 | { |
348 | #ifdef dVAR |
349 | dVAR; dXSARGS; |
350 | #else |
351 | dXSARGS; |
352 | #endif |
353 | |
354 | SV* classname; |
355 | HV* class_stash; |
356 | HV* cache = NULL; |
357 | AV* res; |
358 | I32 res_items; |
359 | I32 ret_items; |
360 | SV** res_ptr; |
361 | |
362 | if(items < 1 || items > 2) |
363 | croak("Usage: calculateMRO(classname[, cache])"); |
364 | |
365 | classname = ST(0); |
f0294f1b |
366 | if(items == 2) cache = (HV*)SvRV(ST(1)); |
b23e9cb9 |
367 | |
368 | class_stash = gv_stashsv(classname, 0); |
625e16df |
369 | if(!class_stash) |
370 | Perl_croak(aTHX_ "No such class: '%s'!", SvPV_nolen(classname)); |
b23e9cb9 |
371 | |
62eb9d08 |
372 | res = __mro_linear_isa_c3(aTHX_ class_stash, cache, 0); |
b23e9cb9 |
373 | |
b23e9cb9 |
374 | res_items = ret_items = AvFILLp(res) + 1; |
375 | res_ptr = AvARRAY(res); |
376 | |
377 | SP -= items; |
378 | |
379 | while(res_items--) { |
380 | SV* res_item = *res_ptr++; |
62eb9d08 |
381 | XPUSHs(sv_2mortal(newSVsv(res_item))); |
b23e9cb9 |
382 | } |
62eb9d08 |
383 | SvREFCNT_dec(res); |
b23e9cb9 |
384 | |
385 | PUTBACK; |
386 | |
387 | return; |
388 | } |
389 | |
625e16df |
390 | XS(XS_Class_C3_XS_calc_mdt); |
391 | XS(XS_Class_C3_XS_calc_mdt) |
392 | { |
393 | #ifdef dVAR |
394 | dVAR; dXSARGS; |
395 | #else |
396 | dXSARGS; |
397 | #endif |
398 | |
399 | SV* classname; |
400 | HV* cache; |
401 | HV* class_stash; |
402 | AV* class_mro; |
403 | HV* our_c3mro; /* $Class::C3::MRO{classname} */ |
404 | SV* has_ovf; |
405 | HV* methods; |
406 | I32 mroitems; |
407 | |
408 | /* temps */ |
409 | HV* hv; |
410 | HE* he; |
411 | SV* rv; |
412 | SV** svp; |
413 | |
414 | if(items < 1 || items > 2) |
415 | croak("Usage: calculate_method_dispatch_table(classname[, cache])"); |
416 | |
417 | classname = ST(0); |
418 | class_stash = gv_stashsv(classname, 0); |
419 | if(!class_stash) |
420 | Perl_croak(aTHX_ "No such class: '%s'!", SvPV_nolen(classname)); |
421 | |
422 | if(items == 2) cache = (HV*)SvRV(ST(1)); |
423 | |
424 | class_mro = __mro_linear_isa_c3(aTHX_ class_stash, cache, 0); |
425 | |
426 | our_c3mro = newHV(); |
427 | hv_store(our_c3mro, "MRO", 3, (SV*)newRV_inc((SV*)class_mro), 0); |
428 | |
429 | hv = get_hv("Class::C3::MRO", 1); |
430 | hv_store_ent(hv, classname, (SV*)newRV_noinc((SV*)our_c3mro), 0); |
431 | |
432 | methods = newHV(); |
433 | |
434 | /* skip first entry */ |
435 | mroitems = AvFILLp(class_mro); |
436 | svp = AvARRAY(class_mro) + 1; |
437 | while(mroitems--) { |
438 | SV* mro_class = *svp++; |
439 | HV* mro_stash = gv_stashsv(mro_class, 0); |
440 | |
441 | if(!mro_stash) continue; |
442 | |
443 | /*if(!has_ovf) { |
444 | SV** ovfp = hv_fetch(mro_stash, "()", 2, 0); |
445 | if(ovfp) has_ovf = *ovfp; |
446 | }*/ |
447 | |
448 | hv_iterinit(mro_stash); |
449 | while(he = hv_iternext(mro_stash)) { |
450 | CV* code; |
451 | SV* mskey; |
452 | SV* msval = hv_iterval(mro_stash, he); |
453 | if(SvTYPE(msval) != SVt_PVGV || !(code = GvCVu(msval))) |
454 | continue; |
455 | |
456 | mskey = hv_iterkeysv(he); |
457 | if(hv_exists_ent(methods, mskey, 0)) continue; |
458 | if((he = hv_fetch_ent(class_stash, mskey, 0, 0))) { |
459 | SV* val = HeVAL(he); |
460 | if(val && SvTYPE(val) == SVt_PVGV && GvCVu(msval)) |
461 | continue; |
462 | } |
463 | |
464 | { |
465 | HV* meth_hash = newHV(); |
466 | SV* orig = newSVsv(mro_class); |
467 | sv_catpvn(orig, "::", 2); |
468 | sv_catsv(orig, mskey); |
469 | hv_store(meth_hash, "orig", 4, orig, 0); |
470 | hv_store(meth_hash, "code", 4, newRV_inc((SV*)code), 0); |
471 | hv_store_ent(methods, mskey, newRV_noinc((SV*)meth_hash), 0); |
472 | } |
473 | } |
474 | } |
475 | |
476 | hv_store(our_c3mro, "methods", 7, newRV_noinc((SV*)methods), 0); |
477 | hv_store(our_c3mro, "has_overload_fallback", 21, has_ovf ? SvREFCNT_inc(has_ovf) : &PL_sv_undef, 0); |
478 | XSRETURN_EMPTY; |
479 | } |
480 | |
b23e9cb9 |
481 | XS(XS_next_can); |
482 | XS(XS_next_can) |
483 | { |
484 | #ifdef dVAR |
485 | dVAR; dXSARGS; |
486 | #else |
487 | dXSARGS; |
488 | #endif |
489 | |
490 | SV* self = ST(0); |
b36f79e1 |
491 | SV* methcv = __nextcan(aTHX_ self, 0); |
b23e9cb9 |
492 | |
493 | PERL_UNUSED_VAR(items); |
494 | |
495 | if(methcv == &PL_sv_undef) { |
496 | ST(0) = &PL_sv_undef; |
497 | } |
498 | else { |
499 | ST(0) = sv_2mortal(newRV_inc(methcv)); |
500 | } |
501 | |
502 | XSRETURN(1); |
503 | } |
504 | |
505 | XS(XS_next_method); |
506 | XS(XS_next_method) |
507 | { |
508 | dMARK; |
509 | dAX; |
510 | SV* self = ST(0); |
b36f79e1 |
511 | SV* methcv = __nextcan(aTHX_ self, 1); |
b23e9cb9 |
512 | |
513 | PL_markstack_ptr++; |
514 | call_sv(methcv, GIMME_V); |
515 | } |
516 | |
517 | XS(XS_maybe_next_method); |
518 | XS(XS_maybe_next_method) |
519 | { |
520 | dMARK; |
521 | dAX; |
522 | SV* self = ST(0); |
b36f79e1 |
523 | SV* methcv = __nextcan(aTHX_ self, 0); |
b23e9cb9 |
524 | |
525 | if(methcv == &PL_sv_undef) { |
526 | ST(0) = &PL_sv_undef; |
527 | XSRETURN(1); |
528 | } |
529 | |
530 | PL_markstack_ptr++; |
531 | call_sv(methcv, GIMME_V); |
532 | } |
533 | |
534 | MODULE = Class::C3::XS PACKAGE = Class::C3::XS |
535 | |
536 | BOOT: |
537 | newXS("Class::C3::XS::calculateMRO", XS_Class_C3_XS_calculateMRO, __FILE__); |
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538 | newXS("Class::C3::XS::_calculate_method_dispatch_table", XS_Class_C3_XS_calc_mdt, __FILE__); |
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539 | newXS("next::can", XS_next_can, __FILE__); |
540 | newXS("next::method", XS_next_method, __FILE__); |
541 | newXS("maybe::next::method", XS_maybe_next_method, __FILE__); |
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542 | |