Commit | Line | Data |
e1a479c5 |
1 | /* mro.c |
2 | * |
3 | * Copyright (c) 2007 Brandon L Black |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
8 | */ |
9 | |
10 | /* |
cac98860 |
11 | * "Which order shall we go in?" said Frodo. "Eldest first, or quickest first? |
12 | * You'll be last either way, Master Peregrin." |
13 | */ |
14 | |
15 | /* |
e1a479c5 |
16 | =head1 MRO Functions |
17 | |
18 | These functions are related to the method resolution order of perl classes |
19 | |
20 | =cut |
21 | */ |
22 | |
23 | #include "EXTERN.h" |
4befac30 |
24 | #define PERL_IN_MRO_C |
e1a479c5 |
25 | #include "perl.h" |
26 | |
3d76853f |
27 | struct mro_alg { |
28 | const char *name; |
29 | AV *(*resolve)(pTHX_ HV* stash, I32 level); |
30 | }; |
31 | |
32 | /* First one is the default */ |
33 | static struct mro_alg mros[] = { |
34 | {"dfs", S_mro_get_linear_isa_dfs}, |
35 | {"c3", S_mro_get_linear_isa_c3} |
36 | }; |
37 | |
38 | #define NUMBER_OF_MROS (sizeof(mros)/sizeof(struct mro_alg)) |
39 | |
40 | static const struct mro_alg * |
41 | S_get_mro_from_name(pTHX_ const char *const name) { |
42 | const struct mro_alg *algo = mros; |
43 | const struct mro_alg *const end = mros + NUMBER_OF_MROS; |
44 | while (algo < end) { |
45 | if(strEQ(name, algo->name)) |
46 | return algo; |
47 | ++algo; |
48 | } |
49 | return NULL; |
50 | } |
51 | |
e1a479c5 |
52 | struct mro_meta* |
53 | Perl_mro_meta_init(pTHX_ HV* stash) |
54 | { |
9fe4aecf |
55 | struct mro_meta* newmeta; |
e1a479c5 |
56 | |
57 | assert(stash); |
58 | assert(HvAUX(stash)); |
59 | assert(!(HvAUX(stash)->xhv_mro_meta)); |
183086be |
60 | Newxz(newmeta, 1, struct mro_meta); |
9fe4aecf |
61 | HvAUX(stash)->xhv_mro_meta = newmeta; |
dd69841b |
62 | newmeta->cache_gen = 1; |
70cd14a1 |
63 | newmeta->pkg_gen = 1; |
edf2cad7 |
64 | newmeta->mro_which = mros; |
e1a479c5 |
65 | |
66 | return newmeta; |
67 | } |
68 | |
69 | #if defined(USE_ITHREADS) |
70 | |
71 | /* for sv_dup on new threads */ |
72 | struct mro_meta* |
73 | Perl_mro_meta_dup(pTHX_ struct mro_meta* smeta, CLONE_PARAMS* param) |
74 | { |
e1a479c5 |
75 | struct mro_meta* newmeta; |
76 | |
77 | assert(smeta); |
78 | |
33e12d9d |
79 | Newx(newmeta, 1, struct mro_meta); |
80 | Copy(smeta, newmeta, 1, struct mro_meta); |
81 | |
82 | if (newmeta->mro_linear_dfs) |
83 | newmeta->mro_linear_dfs |
84 | = (AV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_linear_dfs, param)); |
85 | if (newmeta->mro_linear_c3) |
86 | newmeta->mro_linear_c3 |
87 | = (AV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_linear_c3, param)); |
33e12d9d |
88 | if (newmeta->mro_nextmethod) |
89 | newmeta->mro_nextmethod |
90 | = (HV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_nextmethod, param)); |
e1a479c5 |
91 | |
92 | return newmeta; |
93 | } |
94 | |
95 | #endif /* USE_ITHREADS */ |
96 | |
97 | /* |
98 | =for apidoc mro_get_linear_isa_dfs |
99 | |
100 | Returns the Depth-First Search linearization of @ISA |
101 | the given stash. The return value is a read-only AV*. |
102 | C<level> should be 0 (it is used internally in this |
103 | function's recursion). |
104 | |
1c908217 |
105 | You are responsible for C<SvREFCNT_inc()> on the |
106 | return value if you plan to store it anywhere |
107 | semi-permanently (otherwise it might be deleted |
108 | out from under you the next time the cache is |
109 | invalidated). |
110 | |
e1a479c5 |
111 | =cut |
112 | */ |
4befac30 |
113 | static AV* |
114 | S_mro_get_linear_isa_dfs(pTHX_ HV *stash, I32 level) |
e1a479c5 |
115 | { |
116 | AV* retval; |
117 | GV** gvp; |
118 | GV* gv; |
119 | AV* av; |
190d0b22 |
120 | const HEK* stashhek; |
e1a479c5 |
121 | struct mro_meta* meta; |
122 | |
123 | assert(stash); |
124 | assert(HvAUX(stash)); |
125 | |
190d0b22 |
126 | stashhek = HvNAME_HEK(stash); |
127 | if (!stashhek) |
1e05feb3 |
128 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); |
e1a479c5 |
129 | |
130 | if (level > 100) |
131 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
190d0b22 |
132 | HEK_KEY(stashhek)); |
e1a479c5 |
133 | |
134 | meta = HvMROMETA(stash); |
1c908217 |
135 | |
136 | /* return cache if valid */ |
e1a479c5 |
137 | if((retval = meta->mro_linear_dfs)) { |
e1a479c5 |
138 | return retval; |
139 | } |
140 | |
141 | /* not in cache, make a new one */ |
1c908217 |
142 | |
0fd7ece8 |
143 | retval = (AV*)sv_2mortal((SV *)newAV()); |
190d0b22 |
144 | av_push(retval, newSVhek(stashhek)); /* add ourselves at the top */ |
e1a479c5 |
145 | |
1c908217 |
146 | /* fetch our @ISA */ |
e1a479c5 |
147 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); |
148 | av = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; |
149 | |
640da897 |
150 | if(av && AvFILLp(av) >= 0) { |
1c908217 |
151 | |
152 | /* "stored" is used to keep track of all of the classnames |
153 | we have added to the MRO so far, so we can do a quick |
154 | exists check and avoid adding duplicate classnames to |
155 | the MRO as we go. */ |
156 | |
1e05feb3 |
157 | HV* const stored = (HV*)sv_2mortal((SV*)newHV()); |
ffd8da72 |
158 | SV **svp = AvARRAY(av); |
159 | I32 items = AvFILLp(av) + 1; |
1c908217 |
160 | |
161 | /* foreach(@ISA) */ |
e1a479c5 |
162 | while (items--) { |
163 | SV* const sv = *svp++; |
164 | HV* const basestash = gv_stashsv(sv, 0); |
ffd8da72 |
165 | SV *const *subrv_p; |
166 | I32 subrv_items; |
e1a479c5 |
167 | |
168 | if (!basestash) { |
1c908217 |
169 | /* if no stash exists for this @ISA member, |
170 | simply add it to the MRO and move on */ |
ffd8da72 |
171 | subrv_p = &sv; |
172 | subrv_items = 1; |
e1a479c5 |
173 | } |
174 | else { |
1c908217 |
175 | /* otherwise, recurse into ourselves for the MRO |
b1d0c68a |
176 | of this @ISA member, and append their MRO to ours. |
177 | The recursive call could throw an exception, which |
178 | has memory management implications here, hence the use of |
179 | the mortal. */ |
ffd8da72 |
180 | const AV *const subrv |
181 | = mro_get_linear_isa_dfs(basestash, level + 1); |
182 | |
183 | subrv_p = AvARRAY(subrv); |
184 | subrv_items = AvFILLp(subrv) + 1; |
185 | } |
186 | while(subrv_items--) { |
187 | SV *const subsv = *subrv_p++; |
188 | if(!hv_exists_ent(stored, subsv, 0)) { |
04fe65b0 |
189 | (void)hv_store_ent(stored, subsv, &PL_sv_undef, 0); |
0fd7ece8 |
190 | av_push(retval, newSVsv(subsv)); |
ffd8da72 |
191 | } |
e1a479c5 |
192 | } |
193 | } |
194 | } |
195 | |
0fd7ece8 |
196 | /* now that we're past the exception dangers, grab our own reference to |
197 | the AV we're about to use for the result. The reference owned by the |
198 | mortals' stack will be released soon, so everything will balance. */ |
199 | SvREFCNT_inc_simple_void_NN(retval); |
200 | SvTEMP_off(retval); |
fdef73f9 |
201 | |
1c908217 |
202 | /* we don't want anyone modifying the cache entry but us, |
203 | and we do so by replacing it completely */ |
e1a479c5 |
204 | SvREADONLY_on(retval); |
1c908217 |
205 | |
e1a479c5 |
206 | meta->mro_linear_dfs = retval; |
207 | return retval; |
208 | } |
209 | |
210 | /* |
211 | =for apidoc mro_get_linear_isa_c3 |
212 | |
213 | Returns the C3 linearization of @ISA |
214 | the given stash. The return value is a read-only AV*. |
215 | C<level> should be 0 (it is used internally in this |
216 | function's recursion). |
217 | |
1c908217 |
218 | You are responsible for C<SvREFCNT_inc()> on the |
219 | return value if you plan to store it anywhere |
220 | semi-permanently (otherwise it might be deleted |
221 | out from under you the next time the cache is |
222 | invalidated). |
223 | |
e1a479c5 |
224 | =cut |
225 | */ |
226 | |
4befac30 |
227 | static AV* |
228 | S_mro_get_linear_isa_c3(pTHX_ HV* stash, I32 level) |
e1a479c5 |
229 | { |
230 | AV* retval; |
231 | GV** gvp; |
232 | GV* gv; |
233 | AV* isa; |
190d0b22 |
234 | const HEK* stashhek; |
e1a479c5 |
235 | struct mro_meta* meta; |
236 | |
237 | assert(stash); |
238 | assert(HvAUX(stash)); |
239 | |
190d0b22 |
240 | stashhek = HvNAME_HEK(stash); |
241 | if (!stashhek) |
1e05feb3 |
242 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); |
e1a479c5 |
243 | |
244 | if (level > 100) |
245 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
190d0b22 |
246 | HEK_KEY(stashhek)); |
e1a479c5 |
247 | |
248 | meta = HvMROMETA(stash); |
1c908217 |
249 | |
250 | /* return cache if valid */ |
e1a479c5 |
251 | if((retval = meta->mro_linear_c3)) { |
e1a479c5 |
252 | return retval; |
253 | } |
254 | |
255 | /* not in cache, make a new one */ |
256 | |
e1a479c5 |
257 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); |
258 | isa = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; |
259 | |
1c908217 |
260 | /* For a better idea how the rest of this works, see the much clearer |
261 | pure perl version in Algorithm::C3 0.01: |
262 | http://search.cpan.org/src/STEVAN/Algorithm-C3-0.01/lib/Algorithm/C3.pm |
263 | (later versions go about it differently than this code for speed reasons) |
264 | */ |
8638e433 |
265 | |
e1a479c5 |
266 | if(isa && AvFILLp(isa) >= 0) { |
267 | SV** seqs_ptr; |
268 | I32 seqs_items; |
1e05feb3 |
269 | HV* const tails = (HV*)sv_2mortal((SV*)newHV()); |
270 | AV* const seqs = (AV*)sv_2mortal((SV*)newAV()); |
8638e433 |
271 | I32* heads; |
272 | |
273 | /* This builds @seqs, which is an array of arrays. |
274 | The members of @seqs are the MROs of |
275 | the members of @ISA, followed by @ISA itself. |
276 | */ |
e1a479c5 |
277 | I32 items = AvFILLp(isa) + 1; |
278 | SV** isa_ptr = AvARRAY(isa); |
279 | while(items--) { |
1e05feb3 |
280 | SV* const isa_item = *isa_ptr++; |
281 | HV* const isa_item_stash = gv_stashsv(isa_item, 0); |
e1a479c5 |
282 | if(!isa_item_stash) { |
8638e433 |
283 | /* if no stash, make a temporary fake MRO |
284 | containing just itself */ |
70cd14a1 |
285 | AV* const isa_lin = newAV(); |
e1a479c5 |
286 | av_push(isa_lin, newSVsv(isa_item)); |
70cd14a1 |
287 | av_push(seqs, (SV*)isa_lin); |
e1a479c5 |
288 | } |
289 | else { |
70cd14a1 |
290 | /* recursion */ |
291 | AV* const isa_lin = mro_get_linear_isa_c3(isa_item_stash, level + 1); |
292 | av_push(seqs, SvREFCNT_inc_simple_NN((SV*)isa_lin)); |
e1a479c5 |
293 | } |
e1a479c5 |
294 | } |
1dcae283 |
295 | av_push(seqs, SvREFCNT_inc_simple_NN((SV*)isa)); |
8638e433 |
296 | |
297 | /* This builds "heads", which as an array of integer array |
298 | indices, one per seq, which point at the virtual "head" |
299 | of the seq (initially zero) */ |
300 | Newxz(heads, AvFILLp(seqs)+1, I32); |
301 | |
302 | /* This builds %tails, which has one key for every class |
303 | mentioned in the tail of any sequence in @seqs (tail meaning |
304 | everything after the first class, the "head"). The value |
305 | is how many times this key appears in the tails of @seqs. |
306 | */ |
e1a479c5 |
307 | seqs_ptr = AvARRAY(seqs); |
308 | seqs_items = AvFILLp(seqs) + 1; |
309 | while(seqs_items--) { |
1e05feb3 |
310 | AV* const seq = (AV*)*seqs_ptr++; |
e1a479c5 |
311 | I32 seq_items = AvFILLp(seq); |
312 | if(seq_items > 0) { |
313 | SV** seq_ptr = AvARRAY(seq) + 1; |
314 | while(seq_items--) { |
1e05feb3 |
315 | SV* const seqitem = *seq_ptr++; |
694168e2 |
316 | /* LVALUE fetch will create a new undefined SV if necessary |
317 | */ |
318 | HE* const he = hv_fetch_ent(tails, seqitem, 1, 0); |
319 | if(he) { |
1e05feb3 |
320 | SV* const val = HeVAL(he); |
694168e2 |
321 | /* This will increment undef to 1, which is what we |
322 | want for a newly created entry. */ |
e1a479c5 |
323 | sv_inc(val); |
324 | } |
325 | } |
326 | } |
327 | } |
328 | |
1dcae283 |
329 | /* Initialize retval to build the return value in */ |
330 | retval = newAV(); |
190d0b22 |
331 | av_push(retval, newSVhek(stashhek)); /* us first */ |
1dcae283 |
332 | |
8638e433 |
333 | /* This loop won't terminate until we either finish building |
334 | the MRO, or get an exception. */ |
e1a479c5 |
335 | while(1) { |
e1a479c5 |
336 | SV* cand = NULL; |
337 | SV* winner = NULL; |
8638e433 |
338 | int s; |
339 | |
340 | /* "foreach $seq (@seqs)" */ |
1e05feb3 |
341 | SV** const avptr = AvARRAY(seqs); |
8638e433 |
342 | for(s = 0; s <= AvFILLp(seqs); s++) { |
e1a479c5 |
343 | SV** svp; |
1e05feb3 |
344 | AV * const seq = (AV*)(avptr[s]); |
345 | SV* seqhead; |
8638e433 |
346 | if(!seq) continue; /* skip empty seqs */ |
347 | svp = av_fetch(seq, heads[s], 0); |
348 | seqhead = *svp; /* seqhead = head of this seq */ |
e1a479c5 |
349 | if(!winner) { |
1e05feb3 |
350 | HE* tail_entry; |
351 | SV* val; |
8638e433 |
352 | /* if we haven't found a winner for this round yet, |
353 | and this seqhead is not in tails (or the count |
354 | for it in tails has dropped to zero), then this |
355 | seqhead is our new winner, and is added to the |
356 | final MRO immediately */ |
e1a479c5 |
357 | cand = seqhead; |
358 | if((tail_entry = hv_fetch_ent(tails, cand, 0, 0)) |
359 | && (val = HeVAL(tail_entry)) |
25270bc0 |
360 | && (SvIVX(val) > 0)) |
e1a479c5 |
361 | continue; |
362 | winner = newSVsv(cand); |
363 | av_push(retval, winner); |
8638e433 |
364 | /* note however that even when we find a winner, |
365 | we continue looping over @seqs to do housekeeping */ |
e1a479c5 |
366 | } |
367 | if(!sv_cmp(seqhead, winner)) { |
8638e433 |
368 | /* Once we have a winner (including the iteration |
369 | where we first found him), inc the head ptr |
370 | for any seq which had the winner as a head, |
371 | NULL out any seq which is now empty, |
372 | and adjust tails for consistency */ |
373 | |
1e05feb3 |
374 | const int new_head = ++heads[s]; |
8638e433 |
375 | if(new_head > AvFILLp(seq)) { |
1dcae283 |
376 | SvREFCNT_dec(avptr[s]); |
8638e433 |
377 | avptr[s] = NULL; |
378 | } |
379 | else { |
1e05feb3 |
380 | HE* tail_entry; |
381 | SV* val; |
8638e433 |
382 | /* Because we know this new seqhead used to be |
383 | a tail, we can assume it is in tails and has |
384 | a positive value, which we need to dec */ |
385 | svp = av_fetch(seq, new_head, 0); |
386 | seqhead = *svp; |
387 | tail_entry = hv_fetch_ent(tails, seqhead, 0, 0); |
388 | val = HeVAL(tail_entry); |
389 | sv_dec(val); |
390 | } |
e1a479c5 |
391 | } |
392 | } |
8638e433 |
393 | |
394 | /* if we found no candidates, we are done building the MRO. |
395 | !cand means no seqs have any entries left to check */ |
396 | if(!cand) { |
397 | Safefree(heads); |
398 | break; |
399 | } |
400 | |
401 | /* If we had candidates, but nobody won, then the @ISA |
402 | hierarchy is not C3-incompatible */ |
e1a479c5 |
403 | if(!winner) { |
8638e433 |
404 | /* we have to do some cleanup before we croak */ |
8638e433 |
405 | |
e1a479c5 |
406 | SvREFCNT_dec(retval); |
8638e433 |
407 | Safefree(heads); |
408 | |
e1a479c5 |
409 | Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': " |
190d0b22 |
410 | "merging failed on parent '%"SVf"'", HEK_KEY(stashhek), SVfARG(cand)); |
e1a479c5 |
411 | } |
412 | } |
413 | } |
1dcae283 |
414 | else { /* @ISA was undefined or empty */ |
415 | /* build a retval containing only ourselves */ |
416 | retval = newAV(); |
190d0b22 |
417 | av_push(retval, newSVhek(stashhek)); |
1dcae283 |
418 | } |
e1a479c5 |
419 | |
1c908217 |
420 | /* we don't want anyone modifying the cache entry but us, |
421 | and we do so by replacing it completely */ |
e1a479c5 |
422 | SvREADONLY_on(retval); |
1c908217 |
423 | |
e1a479c5 |
424 | meta->mro_linear_c3 = retval; |
425 | return retval; |
426 | } |
427 | |
428 | /* |
429 | =for apidoc mro_get_linear_isa |
430 | |
431 | Returns either C<mro_get_linear_isa_c3> or |
432 | C<mro_get_linear_isa_dfs> for the given stash, |
433 | dependant upon which MRO is in effect |
434 | for that stash. The return value is a |
435 | read-only AV*. |
436 | |
1c908217 |
437 | You are responsible for C<SvREFCNT_inc()> on the |
438 | return value if you plan to store it anywhere |
439 | semi-permanently (otherwise it might be deleted |
440 | out from under you the next time the cache is |
441 | invalidated). |
442 | |
e1a479c5 |
443 | =cut |
444 | */ |
445 | AV* |
446 | Perl_mro_get_linear_isa(pTHX_ HV *stash) |
447 | { |
448 | struct mro_meta* meta; |
2c7f4b87 |
449 | |
e1a479c5 |
450 | assert(stash); |
2c7f4b87 |
451 | if(!SvOOK(stash)) |
452 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); |
e1a479c5 |
453 | |
454 | meta = HvMROMETA(stash); |
3d76853f |
455 | if (!meta->mro_which) |
14f97ce6 |
456 | Perl_croak(aTHX_ "panic: invalid MRO!"); |
3d76853f |
457 | return meta->mro_which->resolve(aTHX_ stash, 0); |
e1a479c5 |
458 | } |
459 | |
460 | /* |
461 | =for apidoc mro_isa_changed_in |
462 | |
1c908217 |
463 | Takes the necessary steps (cache invalidations, mostly) |
e1a479c5 |
464 | when the @ISA of the given package has changed. Invoked |
465 | by the C<setisa> magic, should not need to invoke directly. |
466 | |
467 | =cut |
468 | */ |
469 | void |
470 | Perl_mro_isa_changed_in(pTHX_ HV* stash) |
471 | { |
472 | dVAR; |
473 | HV* isarev; |
474 | AV* linear_mro; |
475 | HE* iter; |
476 | SV** svp; |
477 | I32 items; |
1e05feb3 |
478 | bool is_universal; |
2c7f4b87 |
479 | struct mro_meta * meta; |
e1a479c5 |
480 | |
0fa56319 |
481 | const char * const stashname = HvNAME_get(stash); |
482 | const STRLEN stashname_len = HvNAMELEN_get(stash); |
e1a479c5 |
483 | |
2c7f4b87 |
484 | if(!stashname) |
485 | Perl_croak(aTHX_ "Can't call mro_isa_changed_in() on anonymous symbol table"); |
486 | |
e1a479c5 |
487 | /* wipe out the cached linearizations for this stash */ |
2c7f4b87 |
488 | meta = HvMROMETA(stash); |
e1a479c5 |
489 | SvREFCNT_dec((SV*)meta->mro_linear_dfs); |
490 | SvREFCNT_dec((SV*)meta->mro_linear_c3); |
491 | meta->mro_linear_dfs = NULL; |
492 | meta->mro_linear_c3 = NULL; |
493 | |
70cd14a1 |
494 | /* Inc the package generation, since our @ISA changed */ |
495 | meta->pkg_gen++; |
496 | |
e1a479c5 |
497 | /* Wipe the global method cache if this package |
498 | is UNIVERSAL or one of its parents */ |
dd69841b |
499 | |
500 | svp = hv_fetch(PL_isarev, stashname, stashname_len, 0); |
501 | isarev = svp ? (HV*)*svp : NULL; |
502 | |
503 | if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL")) |
504 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) { |
e1a479c5 |
505 | PL_sub_generation++; |
dd69841b |
506 | is_universal = TRUE; |
507 | } |
1e05feb3 |
508 | else { /* Wipe the local method cache otherwise */ |
dd69841b |
509 | meta->cache_gen++; |
1e05feb3 |
510 | is_universal = FALSE; |
511 | } |
e1a479c5 |
512 | |
513 | /* wipe next::method cache too */ |
514 | if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod); |
1e05feb3 |
515 | |
e1a479c5 |
516 | /* Iterate the isarev (classes that are our children), |
517 | wiping out their linearization and method caches */ |
dd69841b |
518 | if(isarev) { |
e1a479c5 |
519 | hv_iterinit(isarev); |
520 | while((iter = hv_iternext(isarev))) { |
ec49eb61 |
521 | I32 len; |
522 | const char* const revkey = hv_iterkey(iter, &len); |
523 | HV* revstash = gv_stashpvn(revkey, len, 0); |
bc2cbbac |
524 | struct mro_meta* revmeta; |
525 | |
526 | if(!revstash) continue; |
527 | revmeta = HvMROMETA(revstash); |
e1a479c5 |
528 | SvREFCNT_dec((SV*)revmeta->mro_linear_dfs); |
529 | SvREFCNT_dec((SV*)revmeta->mro_linear_c3); |
530 | revmeta->mro_linear_dfs = NULL; |
531 | revmeta->mro_linear_c3 = NULL; |
dd69841b |
532 | if(!is_universal) |
533 | revmeta->cache_gen++; |
e1a479c5 |
534 | if(revmeta->mro_nextmethod) |
535 | hv_clear(revmeta->mro_nextmethod); |
536 | } |
537 | } |
538 | |
1c908217 |
539 | /* Now iterate our MRO (parents), and do a few things: |
540 | 1) instantiate with the "fake" flag if they don't exist |
541 | 2) flag them as universal if we are universal |
542 | 3) Add everything from our isarev to their isarev |
543 | */ |
544 | |
545 | /* We're starting at the 2nd element, skipping ourselves here */ |
e1a479c5 |
546 | linear_mro = mro_get_linear_isa(stash); |
547 | svp = AvARRAY(linear_mro) + 1; |
548 | items = AvFILLp(linear_mro); |
1c908217 |
549 | |
e1a479c5 |
550 | while (items--) { |
551 | SV* const sv = *svp++; |
e1a479c5 |
552 | HV* mroisarev; |
553 | |
117b69ca |
554 | HE *he = hv_fetch_ent(PL_isarev, sv, TRUE, 0); |
555 | |
556 | /* That fetch should not fail. But if it had to create a new SV for |
4ea50411 |
557 | us, then will need to upgrade it to an HV (which sv_upgrade() can |
558 | now do for us. */ |
117b69ca |
559 | |
dd69841b |
560 | mroisarev = (HV*)HeVAL(he); |
e1a479c5 |
561 | |
4ea50411 |
562 | SvUPGRADE((SV*)mroisarev, SVt_PVHV); |
117b69ca |
563 | |
25270bc0 |
564 | /* This hash only ever contains PL_sv_yes. Storing it over itself is |
565 | almost as cheap as calling hv_exists, so on aggregate we expect to |
566 | save time by not making two calls to the common HV code for the |
567 | case where it doesn't exist. */ |
568 | |
04fe65b0 |
569 | (void)hv_store(mroisarev, stashname, stashname_len, &PL_sv_yes, 0); |
e1a479c5 |
570 | |
571 | if(isarev) { |
572 | hv_iterinit(isarev); |
573 | while((iter = hv_iternext(isarev))) { |
dd69841b |
574 | I32 revkeylen; |
1e05feb3 |
575 | char* const revkey = hv_iterkey(iter, &revkeylen); |
04fe65b0 |
576 | (void)hv_store(mroisarev, revkey, revkeylen, &PL_sv_yes, 0); |
e1a479c5 |
577 | } |
578 | } |
579 | } |
580 | } |
581 | |
582 | /* |
583 | =for apidoc mro_method_changed_in |
584 | |
47c9dd14 |
585 | Invalidates method caching on any child classes |
586 | of the given stash, so that they might notice |
587 | the changes in this one. |
e1a479c5 |
588 | |
589 | Ideally, all instances of C<PL_sub_generation++> in |
dd69841b |
590 | perl source outside of C<mro.c> should be |
591 | replaced by calls to this. |
592 | |
593 | Perl automatically handles most of the common |
594 | ways a method might be redefined. However, there |
595 | are a few ways you could change a method in a stash |
596 | without the cache code noticing, in which case you |
597 | need to call this method afterwards: |
e1a479c5 |
598 | |
dd69841b |
599 | 1) Directly manipulating the stash HV entries from |
600 | XS code. |
e1a479c5 |
601 | |
dd69841b |
602 | 2) Assigning a reference to a readonly scalar |
603 | constant into a stash entry in order to create |
604 | a constant subroutine (like constant.pm |
605 | does). |
606 | |
607 | This same method is available from pure perl |
608 | via, C<mro::method_changed_in(classname)>. |
e1a479c5 |
609 | |
610 | =cut |
611 | */ |
612 | void |
613 | Perl_mro_method_changed_in(pTHX_ HV *stash) |
614 | { |
1e05feb3 |
615 | const char * const stashname = HvNAME_get(stash); |
616 | const STRLEN stashname_len = HvNAMELEN_get(stash); |
dd69841b |
617 | |
1e05feb3 |
618 | SV ** const svp = hv_fetch(PL_isarev, stashname, stashname_len, 0); |
619 | HV * const isarev = svp ? (HV*)*svp : NULL; |
e1a479c5 |
620 | |
2c7f4b87 |
621 | if(!stashname) |
622 | Perl_croak(aTHX_ "Can't call mro_method_changed_in() on anonymous symbol table"); |
623 | |
70cd14a1 |
624 | /* Inc the package generation, since a local method changed */ |
625 | HvMROMETA(stash)->pkg_gen++; |
626 | |
e1a479c5 |
627 | /* If stash is UNIVERSAL, or one of UNIVERSAL's parents, |
628 | invalidate all method caches globally */ |
dd69841b |
629 | if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL")) |
630 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) { |
e1a479c5 |
631 | PL_sub_generation++; |
632 | return; |
633 | } |
634 | |
635 | /* else, invalidate the method caches of all child classes, |
636 | but not itself */ |
dd69841b |
637 | if(isarev) { |
1e05feb3 |
638 | HE* iter; |
639 | |
e1a479c5 |
640 | hv_iterinit(isarev); |
641 | while((iter = hv_iternext(isarev))) { |
ec49eb61 |
642 | I32 len; |
643 | const char* const revkey = hv_iterkey(iter, &len); |
644 | HV* const revstash = gv_stashpvn(revkey, len, 0); |
bc2cbbac |
645 | struct mro_meta* mrometa; |
646 | |
647 | if(!revstash) continue; |
648 | mrometa = HvMROMETA(revstash); |
dd69841b |
649 | mrometa->cache_gen++; |
e1a479c5 |
650 | if(mrometa->mro_nextmethod) |
651 | hv_clear(mrometa->mro_nextmethod); |
652 | } |
653 | } |
654 | } |
655 | |
656 | /* These two are static helpers for next::method and friends, |
657 | and re-implement a bunch of the code from pp_caller() in |
658 | a more efficient manner for this particular usage. |
659 | */ |
660 | |
661 | STATIC I32 |
662 | __dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) { |
663 | I32 i; |
664 | for (i = startingblock; i >= 0; i--) { |
665 | if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i; |
666 | } |
667 | return i; |
668 | } |
669 | |
e1a479c5 |
670 | #include "XSUB.h" |
671 | |
672 | XS(XS_mro_get_linear_isa); |
673 | XS(XS_mro_set_mro); |
674 | XS(XS_mro_get_mro); |
675 | XS(XS_mro_get_isarev); |
676 | XS(XS_mro_is_universal); |
c5860d66 |
677 | XS(XS_mro_invalidate_method_caches); |
e1a479c5 |
678 | XS(XS_mro_method_changed_in); |
70cd14a1 |
679 | XS(XS_mro_get_pkg_gen); |
f58cd386 |
680 | XS(XS_mro_nextcan); |
e1a479c5 |
681 | |
682 | void |
683 | Perl_boot_core_mro(pTHX) |
684 | { |
685 | dVAR; |
686 | static const char file[] = __FILE__; |
687 | |
688 | newXSproto("mro::get_linear_isa", XS_mro_get_linear_isa, file, "$;$"); |
689 | newXSproto("mro::set_mro", XS_mro_set_mro, file, "$$"); |
690 | newXSproto("mro::get_mro", XS_mro_get_mro, file, "$"); |
691 | newXSproto("mro::get_isarev", XS_mro_get_isarev, file, "$"); |
692 | newXSproto("mro::is_universal", XS_mro_is_universal, file, "$"); |
c5860d66 |
693 | newXSproto("mro::invalidate_all_method_caches", XS_mro_invalidate_method_caches, file, ""); |
e1a479c5 |
694 | newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$"); |
70cd14a1 |
695 | newXSproto("mro::get_pkg_gen", XS_mro_get_pkg_gen, file, "$"); |
f58cd386 |
696 | newXS("mro::_nextcan", XS_mro_nextcan, file); |
e1a479c5 |
697 | } |
698 | |
699 | XS(XS_mro_get_linear_isa) { |
700 | dVAR; |
701 | dXSARGS; |
702 | AV* RETVAL; |
703 | HV* class_stash; |
704 | SV* classname; |
705 | |
706 | PERL_UNUSED_ARG(cv); |
707 | |
708 | if(items < 1 || items > 2) |
709 | Perl_croak(aTHX_ "Usage: mro::get_linear_isa(classname [, type ])"); |
710 | |
711 | classname = ST(0); |
712 | class_stash = gv_stashsv(classname, 0); |
e1a479c5 |
713 | |
70cd14a1 |
714 | if(!class_stash) { |
715 | /* No stash exists yet, give them just the classname */ |
716 | AV* isalin = newAV(); |
717 | av_push(isalin, newSVsv(classname)); |
718 | ST(0) = sv_2mortal(newRV_noinc((SV*)isalin)); |
719 | XSRETURN(1); |
720 | } |
721 | else if(items > 1) { |
1e05feb3 |
722 | const char* const which = SvPV_nolen(ST(1)); |
3d76853f |
723 | const struct mro_alg *const algo = S_get_mro_from_name(aTHX_ which); |
724 | if (!algo) |
725 | Perl_croak(aTHX_ "Invalid mro name: '%s'", which); |
84dccb35 |
726 | RETVAL = algo->resolve(aTHX_ class_stash, 0); |
e1a479c5 |
727 | } |
728 | else { |
729 | RETVAL = mro_get_linear_isa(class_stash); |
730 | } |
731 | |
732 | ST(0) = newRV_inc((SV*)RETVAL); |
733 | sv_2mortal(ST(0)); |
734 | XSRETURN(1); |
735 | } |
736 | |
737 | XS(XS_mro_set_mro) |
738 | { |
739 | dVAR; |
740 | dXSARGS; |
741 | SV* classname; |
3d76853f |
742 | const char* whichstr; |
743 | const struct mro_alg *which; |
e1a479c5 |
744 | HV* class_stash; |
745 | struct mro_meta* meta; |
746 | |
747 | PERL_UNUSED_ARG(cv); |
748 | |
749 | if (items != 2) |
750 | Perl_croak(aTHX_ "Usage: mro::set_mro(classname, type)"); |
751 | |
752 | classname = ST(0); |
753 | whichstr = SvPV_nolen(ST(1)); |
754 | class_stash = gv_stashsv(classname, GV_ADD); |
755 | if(!class_stash) Perl_croak(aTHX_ "Cannot create class: '%"SVf"'!", SVfARG(classname)); |
756 | meta = HvMROMETA(class_stash); |
757 | |
3d76853f |
758 | which = S_get_mro_from_name(aTHX_ whichstr); |
759 | if (!which) |
e1a479c5 |
760 | Perl_croak(aTHX_ "Invalid mro name: '%s'", whichstr); |
761 | |
762 | if(meta->mro_which != which) { |
763 | meta->mro_which = which; |
764 | /* Only affects local method cache, not |
765 | even child classes */ |
dd69841b |
766 | meta->cache_gen++; |
e1a479c5 |
767 | if(meta->mro_nextmethod) |
768 | hv_clear(meta->mro_nextmethod); |
769 | } |
770 | |
771 | XSRETURN_EMPTY; |
772 | } |
773 | |
774 | |
775 | XS(XS_mro_get_mro) |
776 | { |
777 | dVAR; |
778 | dXSARGS; |
779 | SV* classname; |
780 | HV* class_stash; |
e1a479c5 |
781 | |
782 | PERL_UNUSED_ARG(cv); |
783 | |
784 | if (items != 1) |
785 | Perl_croak(aTHX_ "Usage: mro::get_mro(classname)"); |
786 | |
787 | classname = ST(0); |
788 | class_stash = gv_stashsv(classname, 0); |
e1a479c5 |
789 | |
3d76853f |
790 | ST(0) = sv_2mortal(newSVpv(class_stash |
791 | ? HvMROMETA(class_stash)->mro_which->name |
792 | : "dfs", 0)); |
e1a479c5 |
793 | XSRETURN(1); |
794 | } |
795 | |
796 | XS(XS_mro_get_isarev) |
797 | { |
798 | dVAR; |
799 | dXSARGS; |
800 | SV* classname; |
73968c7a |
801 | HE* he; |
e1a479c5 |
802 | HV* isarev; |
70cd14a1 |
803 | AV* ret_array; |
e1a479c5 |
804 | |
805 | PERL_UNUSED_ARG(cv); |
806 | |
807 | if (items != 1) |
808 | Perl_croak(aTHX_ "Usage: mro::get_isarev(classname)"); |
809 | |
810 | classname = ST(0); |
811 | |
e1a479c5 |
812 | SP -= items; |
dd69841b |
813 | |
70cd14a1 |
814 | |
73968c7a |
815 | he = hv_fetch_ent(PL_isarev, classname, 0, 0); |
816 | isarev = he ? (HV*)HeVAL(he) : NULL; |
70cd14a1 |
817 | |
818 | ret_array = newAV(); |
dd69841b |
819 | if(isarev) { |
e1a479c5 |
820 | HE* iter; |
821 | hv_iterinit(isarev); |
822 | while((iter = hv_iternext(isarev))) |
70cd14a1 |
823 | av_push(ret_array, newSVsv(hv_iterkeysv(iter))); |
e1a479c5 |
824 | } |
6e449a3a |
825 | mXPUSHs(newRV_noinc((SV*)ret_array)); |
e1a479c5 |
826 | |
827 | PUTBACK; |
828 | return; |
829 | } |
830 | |
831 | XS(XS_mro_is_universal) |
832 | { |
833 | dVAR; |
834 | dXSARGS; |
835 | SV* classname; |
dd69841b |
836 | HV* isarev; |
70cd14a1 |
837 | char* classname_pv; |
838 | STRLEN classname_len; |
73968c7a |
839 | HE* he; |
e1a479c5 |
840 | |
841 | PERL_UNUSED_ARG(cv); |
842 | |
843 | if (items != 1) |
dd69841b |
844 | Perl_croak(aTHX_ "Usage: mro::is_universal(classname)"); |
e1a479c5 |
845 | |
846 | classname = ST(0); |
e1a479c5 |
847 | |
cfff9797 |
848 | classname_pv = SvPV(classname,classname_len); |
dd69841b |
849 | |
73968c7a |
850 | he = hv_fetch_ent(PL_isarev, classname, 0, 0); |
851 | isarev = he ? (HV*)HeVAL(he) : NULL; |
dd69841b |
852 | |
70cd14a1 |
853 | if((classname_len == 9 && strEQ(classname_pv, "UNIVERSAL")) |
dd69841b |
854 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) |
9edc5bb8 |
855 | XSRETURN_YES; |
856 | else |
857 | XSRETURN_NO; |
e1a479c5 |
858 | } |
859 | |
c5860d66 |
860 | XS(XS_mro_invalidate_method_caches) |
e1a479c5 |
861 | { |
862 | dVAR; |
863 | dXSARGS; |
864 | |
865 | PERL_UNUSED_ARG(cv); |
866 | |
867 | if (items != 0) |
868 | Perl_croak(aTHX_ "Usage: mro::invalidate_all_method_caches()"); |
869 | |
870 | PL_sub_generation++; |
871 | |
872 | XSRETURN_EMPTY; |
873 | } |
874 | |
e1a479c5 |
875 | XS(XS_mro_method_changed_in) |
876 | { |
877 | dVAR; |
878 | dXSARGS; |
879 | SV* classname; |
880 | HV* class_stash; |
881 | |
882 | PERL_UNUSED_ARG(cv); |
883 | |
884 | if(items != 1) |
885 | Perl_croak(aTHX_ "Usage: mro::method_changed_in(classname)"); |
886 | |
887 | classname = ST(0); |
888 | |
889 | class_stash = gv_stashsv(classname, 0); |
890 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); |
891 | |
892 | mro_method_changed_in(class_stash); |
893 | |
894 | XSRETURN_EMPTY; |
895 | } |
896 | |
70cd14a1 |
897 | XS(XS_mro_get_pkg_gen) |
898 | { |
899 | dVAR; |
900 | dXSARGS; |
901 | SV* classname; |
902 | HV* class_stash; |
903 | |
904 | PERL_UNUSED_ARG(cv); |
905 | |
906 | if(items != 1) |
907 | Perl_croak(aTHX_ "Usage: mro::get_pkg_gen(classname)"); |
908 | |
909 | classname = ST(0); |
910 | |
911 | class_stash = gv_stashsv(classname, 0); |
912 | |
913 | SP -= items; |
914 | |
6e449a3a |
915 | mXPUSHi(class_stash ? HvMROMETA(class_stash)->pkg_gen : 0); |
70cd14a1 |
916 | |
917 | PUTBACK; |
918 | return; |
919 | } |
920 | |
f58cd386 |
921 | XS(XS_mro_nextcan) |
e1a479c5 |
922 | { |
923 | dVAR; |
924 | dXSARGS; |
f58cd386 |
925 | SV* self = ST(0); |
926 | const I32 throw_nomethod = SvIVX(ST(1)); |
bbd28cb9 |
927 | register I32 cxix = cxstack_ix; |
f58cd386 |
928 | register const PERL_CONTEXT *ccstack = cxstack; |
929 | const PERL_SI *top_si = PL_curstackinfo; |
930 | HV* selfstash; |
931 | SV *stashname; |
932 | const char *fq_subname; |
933 | const char *subname; |
934 | STRLEN stashname_len; |
935 | STRLEN subname_len; |
936 | SV* sv; |
937 | GV** gvp; |
938 | AV* linear_av; |
939 | SV** linear_svp; |
940 | const char *hvname; |
941 | I32 entries; |
942 | struct mro_meta* selfmeta; |
943 | HV* nmcache; |
bbd28cb9 |
944 | I32 i; |
e1a479c5 |
945 | |
48fc4736 |
946 | PERL_UNUSED_ARG(cv); |
947 | |
f58cd386 |
948 | SP -= items; |
949 | |
950 | if(sv_isobject(self)) |
951 | selfstash = SvSTASH(SvRV(self)); |
952 | else |
953 | selfstash = gv_stashsv(self, 0); |
954 | |
955 | assert(selfstash); |
956 | |
957 | hvname = HvNAME_get(selfstash); |
958 | if (!hvname) |
959 | Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); |
960 | |
f58cd386 |
961 | /* This block finds the contextually-enclosing fully-qualified subname, |
962 | much like looking at (caller($i))[3] until you find a real sub that |
bbd28cb9 |
963 | isn't ANON, etc (also skips over pureperl next::method, etc) */ |
964 | for(i = 0; i < 2; i++) { |
965 | cxix = __dopoptosub_at(ccstack, cxix); |
966 | for (;;) { |
967 | GV* cvgv; |
968 | STRLEN fq_subname_len; |
969 | |
970 | /* we may be in a higher stacklevel, so dig down deeper */ |
971 | while (cxix < 0) { |
972 | if(top_si->si_type == PERLSI_MAIN) |
973 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method must be used in method context"); |
974 | top_si = top_si->si_prev; |
975 | ccstack = top_si->si_cxstack; |
976 | cxix = __dopoptosub_at(ccstack, top_si->si_cxix); |
977 | } |
f58cd386 |
978 | |
bbd28cb9 |
979 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB |
980 | || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) { |
981 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
982 | continue; |
983 | } |
e1a479c5 |
984 | |
bbd28cb9 |
985 | { |
986 | const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1); |
987 | if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) { |
988 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) { |
989 | cxix = dbcxix; |
990 | continue; |
991 | } |
f58cd386 |
992 | } |
993 | } |
f58cd386 |
994 | |
bbd28cb9 |
995 | cvgv = CvGV(ccstack[cxix].blk_sub.cv); |
f58cd386 |
996 | |
bbd28cb9 |
997 | if(!isGV(cvgv)) { |
998 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
999 | continue; |
1000 | } |
f58cd386 |
1001 | |
bbd28cb9 |
1002 | /* we found a real sub here */ |
1003 | sv = sv_2mortal(newSV(0)); |
f58cd386 |
1004 | |
bbd28cb9 |
1005 | gv_efullname3(sv, cvgv, NULL); |
f58cd386 |
1006 | |
bbd28cb9 |
1007 | fq_subname = SvPVX(sv); |
1008 | fq_subname_len = SvCUR(sv); |
f58cd386 |
1009 | |
bbd28cb9 |
1010 | subname = strrchr(fq_subname, ':'); |
1011 | if(!subname) |
1012 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method"); |
f58cd386 |
1013 | |
bbd28cb9 |
1014 | subname++; |
1015 | subname_len = fq_subname_len - (subname - fq_subname); |
1016 | if(subname_len == 8 && strEQ(subname, "__ANON__")) { |
1017 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
1018 | continue; |
1019 | } |
1020 | break; |
f58cd386 |
1021 | } |
bbd28cb9 |
1022 | cxix--; |
e1a479c5 |
1023 | } |
f58cd386 |
1024 | |
1025 | /* If we made it to here, we found our context */ |
1026 | |
1027 | /* Initialize the next::method cache for this stash |
1028 | if necessary */ |
1029 | selfmeta = HvMROMETA(selfstash); |
1030 | if(!(nmcache = selfmeta->mro_nextmethod)) { |
1031 | nmcache = selfmeta->mro_nextmethod = newHV(); |
1032 | } |
1033 | else { /* Use the cached coderef if it exists */ |
1034 | HE* cache_entry = hv_fetch_ent(nmcache, sv, 0, 0); |
1035 | if (cache_entry) { |
1036 | SV* const val = HeVAL(cache_entry); |
1037 | if(val == &PL_sv_undef) { |
1038 | if(throw_nomethod) |
1039 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); |
1040 | XSRETURN_EMPTY; |
1041 | } |
6e449a3a |
1042 | mXPUSHs(newRV_inc(val)); |
f58cd386 |
1043 | XSRETURN(1); |
1044 | } |
e1a479c5 |
1045 | } |
1046 | |
f58cd386 |
1047 | /* beyond here is just for cache misses, so perf isn't as critical */ |
e1a479c5 |
1048 | |
f58cd386 |
1049 | stashname_len = subname - fq_subname - 2; |
59cd0e26 |
1050 | stashname = newSVpvn_flags(fq_subname, stashname_len, SVs_TEMP); |
e1a479c5 |
1051 | |
f58cd386 |
1052 | linear_av = mro_get_linear_isa_c3(selfstash, 0); /* has ourselves at the top of the list */ |
e1a479c5 |
1053 | |
f58cd386 |
1054 | linear_svp = AvARRAY(linear_av); |
1055 | entries = AvFILLp(linear_av) + 1; |
e1a479c5 |
1056 | |
f58cd386 |
1057 | /* Walk down our MRO, skipping everything up |
1058 | to the contextually enclosing class */ |
1059 | while (entries--) { |
1060 | SV * const linear_sv = *linear_svp++; |
1061 | assert(linear_sv); |
1062 | if(sv_eq(linear_sv, stashname)) |
1063 | break; |
1064 | } |
e1a479c5 |
1065 | |
f58cd386 |
1066 | /* Now search the remainder of the MRO for the |
1067 | same method name as the contextually enclosing |
1068 | method */ |
1069 | if(entries > 0) { |
1070 | while (entries--) { |
1071 | SV * const linear_sv = *linear_svp++; |
1072 | HV* curstash; |
1073 | GV* candidate; |
1074 | CV* cand_cv; |
e1a479c5 |
1075 | |
f58cd386 |
1076 | assert(linear_sv); |
1077 | curstash = gv_stashsv(linear_sv, FALSE); |
1078 | |
1079 | if (!curstash) { |
1080 | if (ckWARN(WARN_SYNTAX)) |
1081 | Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA", |
1082 | (void*)linear_sv, hvname); |
1083 | continue; |
1084 | } |
1085 | |
1086 | assert(curstash); |
1087 | |
1088 | gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0); |
1089 | if (!gvp) continue; |
1090 | |
1091 | candidate = *gvp; |
1092 | assert(candidate); |
1093 | |
1094 | if (SvTYPE(candidate) != SVt_PVGV) |
1095 | gv_init(candidate, curstash, subname, subname_len, TRUE); |
1096 | |
1097 | /* Notably, we only look for real entries, not method cache |
1098 | entries, because in C3 the method cache of a parent is not |
1099 | valid for the child */ |
1100 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { |
1101 | SvREFCNT_inc_simple_void_NN((SV*)cand_cv); |
04fe65b0 |
1102 | (void)hv_store_ent(nmcache, newSVsv(sv), (SV*)cand_cv, 0); |
6e449a3a |
1103 | mXPUSHs(newRV_inc((SV*)cand_cv)); |
f58cd386 |
1104 | XSRETURN(1); |
1105 | } |
1106 | } |
e1a479c5 |
1107 | } |
1108 | |
04fe65b0 |
1109 | (void)hv_store_ent(nmcache, newSVsv(sv), &PL_sv_undef, 0); |
f58cd386 |
1110 | if(throw_nomethod) |
1111 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); |
1112 | XSRETURN_EMPTY; |
e1a479c5 |
1113 | } |
1114 | |
1115 | /* |
1116 | * Local variables: |
1117 | * c-indentation-style: bsd |
1118 | * c-basic-offset: 4 |
1119 | * indent-tabs-mode: t |
1120 | * End: |
1121 | * |
1122 | * ex: set ts=8 sts=4 sw=4 noet: |
1123 | */ |