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e1a479c5 BB |
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 RGS |
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 BB |
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 BB |
25 | #include "perl.h" |
26 | ||
3d76853f NC |
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 BB |
52 | struct mro_meta* |
53 | Perl_mro_meta_init(pTHX_ HV* stash) | |
54 | { | |
9fe4aecf | 55 | struct mro_meta* newmeta; |
e1a479c5 BB |
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 BB |
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 BB |
75 | struct mro_meta* newmeta; |
76 | ||
77 | assert(smeta); | |
78 | ||
33e12d9d NC |
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 NC |
88 | if (newmeta->mro_nextmethod) |
89 | newmeta->mro_nextmethod | |
90 | = (HV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_nextmethod, param)); | |
e1a479c5 BB |
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 RGS |
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 BB |
111 | =cut |
112 | */ | |
4befac30 NC |
113 | static AV* |
114 | S_mro_get_linear_isa_dfs(pTHX_ HV *stash, I32 level) | |
e1a479c5 BB |
115 | { |
116 | AV* retval; | |
117 | GV** gvp; | |
118 | GV* gv; | |
119 | AV* av; | |
190d0b22 | 120 | const HEK* stashhek; |
e1a479c5 BB |
121 | struct mro_meta* meta; |
122 | ||
123 | assert(stash); | |
124 | assert(HvAUX(stash)); | |
125 | ||
190d0b22 NC |
126 | stashhek = HvNAME_HEK(stash); |
127 | if (!stashhek) | |
1e05feb3 | 128 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); |
e1a479c5 BB |
129 | |
130 | if (level > 100) | |
131 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", | |
190d0b22 | 132 | HEK_KEY(stashhek)); |
e1a479c5 BB |
133 | |
134 | meta = HvMROMETA(stash); | |
1c908217 RGS |
135 | |
136 | /* return cache if valid */ | |
e1a479c5 | 137 | if((retval = meta->mro_linear_dfs)) { |
e1a479c5 BB |
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 BB |
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 RGS |
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 NC |
158 | SV **svp = AvARRAY(av); |
159 | I32 items = AvFILLp(av) + 1; | |
1c908217 RGS |
160 | |
161 | /* foreach(@ISA) */ | |
e1a479c5 BB |
162 | while (items--) { |
163 | SV* const sv = *svp++; | |
164 | HV* const basestash = gv_stashsv(sv, 0); | |
ffd8da72 NC |
165 | SV *const *subrv_p; |
166 | I32 subrv_items; | |
e1a479c5 BB |
167 | |
168 | if (!basestash) { | |
1c908217 RGS |
169 | /* if no stash exists for this @ISA member, |
170 | simply add it to the MRO and move on */ | |
ffd8da72 NC |
171 | subrv_p = &sv; |
172 | subrv_items = 1; | |
e1a479c5 BB |
173 | } |
174 | else { | |
1c908217 | 175 | /* otherwise, recurse into ourselves for the MRO |
b1d0c68a NC |
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 NC |
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 BB |
192 | } |
193 | } | |
194 | } | |
195 | ||
0fd7ece8 NC |
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 RGS |
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 BB |
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 RGS |
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 BB |
224 | =cut |
225 | */ | |
226 | ||
4befac30 NC |
227 | static AV* |
228 | S_mro_get_linear_isa_c3(pTHX_ HV* stash, I32 level) | |
e1a479c5 BB |
229 | { |
230 | AV* retval; | |
231 | GV** gvp; | |
232 | GV* gv; | |
233 | AV* isa; | |
190d0b22 | 234 | const HEK* stashhek; |
e1a479c5 BB |
235 | struct mro_meta* meta; |
236 | ||
237 | assert(stash); | |
238 | assert(HvAUX(stash)); | |
239 | ||
190d0b22 NC |
240 | stashhek = HvNAME_HEK(stash); |
241 | if (!stashhek) | |
1e05feb3 | 242 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); |
e1a479c5 BB |
243 | |
244 | if (level > 100) | |
245 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", | |
190d0b22 | 246 | HEK_KEY(stashhek)); |
e1a479c5 BB |
247 | |
248 | meta = HvMROMETA(stash); | |
1c908217 RGS |
249 | |
250 | /* return cache if valid */ | |
e1a479c5 | 251 | if((retval = meta->mro_linear_c3)) { |
e1a479c5 BB |
252 | return retval; |
253 | } | |
254 | ||
255 | /* not in cache, make a new one */ | |
256 | ||
e1a479c5 BB |
257 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); |
258 | isa = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; | |
259 | ||
1c908217 RGS |
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 BB |
266 | if(isa && AvFILLp(isa) >= 0) { |
267 | SV** seqs_ptr; | |
268 | I32 seqs_items; | |
1e05feb3 AL |
269 | HV* const tails = (HV*)sv_2mortal((SV*)newHV()); |
270 | AV* const seqs = (AV*)sv_2mortal((SV*)newAV()); | |
8638e433 RGS |
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 BB |
277 | I32 items = AvFILLp(isa) + 1; |
278 | SV** isa_ptr = AvARRAY(isa); | |
279 | while(items--) { | |
1e05feb3 AL |
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 RGS |
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 BB |
288 | } |
289 | else { | |
70cd14a1 CB |
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 RGS |
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 BB |
307 | seqs_ptr = AvARRAY(seqs); |
308 | seqs_items = AvFILLp(seqs) + 1; | |
309 | while(seqs_items--) { | |
1e05feb3 | 310 | AV* const seq = (AV*)*seqs_ptr++; |
e1a479c5 BB |
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 NC |
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 NC |
321 | /* This will increment undef to 1, which is what we |
322 | want for a newly created entry. */ | |
e1a479c5 BB |
323 | sv_inc(val); |
324 | } | |
325 | } | |
326 | } | |
327 | } | |
328 | ||
1dcae283 BB |
329 | /* Initialize retval to build the return value in */ |
330 | retval = newAV(); | |
190d0b22 | 331 | av_push(retval, newSVhek(stashhek)); /* us first */ |
1dcae283 | 332 | |
8638e433 RGS |
333 | /* This loop won't terminate until we either finish building |
334 | the MRO, or get an exception. */ | |
e1a479c5 | 335 | while(1) { |
e1a479c5 BB |
336 | SV* cand = NULL; |
337 | SV* winner = NULL; | |
8638e433 RGS |
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 AL |
344 | AV * const seq = (AV*)(avptr[s]); |
345 | SV* seqhead; | |
8638e433 RGS |
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 AL |
350 | HE* tail_entry; |
351 | SV* val; | |
8638e433 RGS |
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 BB |
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 BB |
361 | continue; |
362 | winner = newSVsv(cand); | |
363 | av_push(retval, winner); | |
8638e433 RGS |
364 | /* note however that even when we find a winner, |
365 | we continue looping over @seqs to do housekeeping */ | |
e1a479c5 BB |
366 | } |
367 | if(!sv_cmp(seqhead, winner)) { | |
8638e433 RGS |
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 RGS |
377 | avptr[s] = NULL; |
378 | } | |
379 | else { | |
1e05feb3 AL |
380 | HE* tail_entry; |
381 | SV* val; | |
8638e433 RGS |
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 BB |
391 | } |
392 | } | |
8638e433 RGS |
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 RGS |
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 BB |
411 | } |
412 | } | |
413 | } | |
1dcae283 BB |
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 RGS |
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 BB |
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 RGS |
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 BB |
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 BB |
451 | if(!SvOOK(stash)) |
452 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); | |
e1a479c5 BB |
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 BB |
458 | } |
459 | ||
460 | /* | |
461 | =for apidoc mro_isa_changed_in | |
462 | ||
1c908217 | 463 | Takes the necessary steps (cache invalidations, mostly) |
e1a479c5 BB |
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 RGS |
481 | const char * const stashname = HvNAME_get(stash); |
482 | const STRLEN stashname_len = HvNAMELEN_get(stash); | |
e1a479c5 | 483 | |
2c7f4b87 BB |
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 BB |
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 CB |
494 | /* Inc the package generation, since our @ISA changed */ |
495 | meta->pkg_gen++; | |
496 | ||
e1a479c5 BB |
497 | /* Wipe the global method cache if this package |
498 | is UNIVERSAL or one of its parents */ | |
dd69841b BB |
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 BB |
506 | is_universal = TRUE; |
507 | } | |
1e05feb3 | 508 | else { /* Wipe the local method cache otherwise */ |
dd69841b | 509 | meta->cache_gen++; |
1e05feb3 AL |
510 | is_universal = FALSE; |
511 | } | |
e1a479c5 BB |
512 | |
513 | /* wipe next::method cache too */ | |
514 | if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod); | |
1e05feb3 | 515 | |
e1a479c5 BB |
516 | /* Iterate the isarev (classes that are our children), |
517 | wiping out their linearization and method caches */ | |
dd69841b | 518 | if(isarev) { |
e1a479c5 BB |
519 | hv_iterinit(isarev); |
520 | while((iter = hv_iternext(isarev))) { | |
ec49eb61 NC |
521 | I32 len; |
522 | const char* const revkey = hv_iterkey(iter, &len); | |
523 | HV* revstash = gv_stashpvn(revkey, len, 0); | |
bc2cbbac BB |
524 | struct mro_meta* revmeta; |
525 | ||
526 | if(!revstash) continue; | |
527 | revmeta = HvMROMETA(revstash); | |
e1a479c5 BB |
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 BB |
532 | if(!is_universal) |
533 | revmeta->cache_gen++; | |
e1a479c5 BB |
534 | if(revmeta->mro_nextmethod) |
535 | hv_clear(revmeta->mro_nextmethod); | |
536 | } | |
537 | } | |
538 | ||
1c908217 RGS |
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 BB |
546 | linear_mro = mro_get_linear_isa(stash); |
547 | svp = AvARRAY(linear_mro) + 1; | |
548 | items = AvFILLp(linear_mro); | |
1c908217 | 549 | |
e1a479c5 BB |
550 | while (items--) { |
551 | SV* const sv = *svp++; | |
e1a479c5 BB |
552 | HV* mroisarev; |
553 | ||
117b69ca NC |
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 | |
557 | us, then we can detect it, because it will not be the correct type. | |
558 | Probably faster and cleaner for us to free that scalar [very little | |
559 | code actually executed to free it] and create a new HV than to | |
560 | copy&paste [SIN!] the code from newHV() to allow us to upgrade the | |
561 | new SV from SVt_NULL. */ | |
562 | ||
dd69841b | 563 | mroisarev = (HV*)HeVAL(he); |
e1a479c5 | 564 | |
117b69ca NC |
565 | if(SvTYPE(mroisarev) != SVt_PVHV) { |
566 | SvREFCNT_dec(mroisarev); | |
ec49eb61 NC |
567 | mroisarev = newHV(); |
568 | HeVAL(he) = (SV *)mroisarev; | |
117b69ca NC |
569 | } |
570 | ||
25270bc0 NC |
571 | /* This hash only ever contains PL_sv_yes. Storing it over itself is |
572 | almost as cheap as calling hv_exists, so on aggregate we expect to | |
573 | save time by not making two calls to the common HV code for the | |
574 | case where it doesn't exist. */ | |
575 | ||
04fe65b0 | 576 | (void)hv_store(mroisarev, stashname, stashname_len, &PL_sv_yes, 0); |
e1a479c5 BB |
577 | |
578 | if(isarev) { | |
579 | hv_iterinit(isarev); | |
580 | while((iter = hv_iternext(isarev))) { | |
dd69841b | 581 | I32 revkeylen; |
1e05feb3 | 582 | char* const revkey = hv_iterkey(iter, &revkeylen); |
04fe65b0 | 583 | (void)hv_store(mroisarev, revkey, revkeylen, &PL_sv_yes, 0); |
e1a479c5 BB |
584 | } |
585 | } | |
586 | } | |
587 | } | |
588 | ||
589 | /* | |
590 | =for apidoc mro_method_changed_in | |
591 | ||
47c9dd14 BB |
592 | Invalidates method caching on any child classes |
593 | of the given stash, so that they might notice | |
594 | the changes in this one. | |
e1a479c5 BB |
595 | |
596 | Ideally, all instances of C<PL_sub_generation++> in | |
dd69841b BB |
597 | perl source outside of C<mro.c> should be |
598 | replaced by calls to this. | |
599 | ||
600 | Perl automatically handles most of the common | |
601 | ways a method might be redefined. However, there | |
602 | are a few ways you could change a method in a stash | |
603 | without the cache code noticing, in which case you | |
604 | need to call this method afterwards: | |
e1a479c5 | 605 | |
dd69841b BB |
606 | 1) Directly manipulating the stash HV entries from |
607 | XS code. | |
e1a479c5 | 608 | |
dd69841b BB |
609 | 2) Assigning a reference to a readonly scalar |
610 | constant into a stash entry in order to create | |
611 | a constant subroutine (like constant.pm | |
612 | does). | |
613 | ||
614 | This same method is available from pure perl | |
615 | via, C<mro::method_changed_in(classname)>. | |
e1a479c5 BB |
616 | |
617 | =cut | |
618 | */ | |
619 | void | |
620 | Perl_mro_method_changed_in(pTHX_ HV *stash) | |
621 | { | |
1e05feb3 AL |
622 | const char * const stashname = HvNAME_get(stash); |
623 | const STRLEN stashname_len = HvNAMELEN_get(stash); | |
dd69841b | 624 | |
1e05feb3 AL |
625 | SV ** const svp = hv_fetch(PL_isarev, stashname, stashname_len, 0); |
626 | HV * const isarev = svp ? (HV*)*svp : NULL; | |
e1a479c5 | 627 | |
2c7f4b87 BB |
628 | if(!stashname) |
629 | Perl_croak(aTHX_ "Can't call mro_method_changed_in() on anonymous symbol table"); | |
630 | ||
70cd14a1 CB |
631 | /* Inc the package generation, since a local method changed */ |
632 | HvMROMETA(stash)->pkg_gen++; | |
633 | ||
e1a479c5 BB |
634 | /* If stash is UNIVERSAL, or one of UNIVERSAL's parents, |
635 | invalidate all method caches globally */ | |
dd69841b BB |
636 | if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL")) |
637 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) { | |
e1a479c5 BB |
638 | PL_sub_generation++; |
639 | return; | |
640 | } | |
641 | ||
642 | /* else, invalidate the method caches of all child classes, | |
643 | but not itself */ | |
dd69841b | 644 | if(isarev) { |
1e05feb3 AL |
645 | HE* iter; |
646 | ||
e1a479c5 BB |
647 | hv_iterinit(isarev); |
648 | while((iter = hv_iternext(isarev))) { | |
ec49eb61 NC |
649 | I32 len; |
650 | const char* const revkey = hv_iterkey(iter, &len); | |
651 | HV* const revstash = gv_stashpvn(revkey, len, 0); | |
bc2cbbac BB |
652 | struct mro_meta* mrometa; |
653 | ||
654 | if(!revstash) continue; | |
655 | mrometa = HvMROMETA(revstash); | |
dd69841b | 656 | mrometa->cache_gen++; |
e1a479c5 BB |
657 | if(mrometa->mro_nextmethod) |
658 | hv_clear(mrometa->mro_nextmethod); | |
659 | } | |
660 | } | |
661 | } | |
662 | ||
663 | /* These two are static helpers for next::method and friends, | |
664 | and re-implement a bunch of the code from pp_caller() in | |
665 | a more efficient manner for this particular usage. | |
666 | */ | |
667 | ||
668 | STATIC I32 | |
669 | __dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) { | |
670 | I32 i; | |
671 | for (i = startingblock; i >= 0; i--) { | |
672 | if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i; | |
673 | } | |
674 | return i; | |
675 | } | |
676 | ||
e1a479c5 BB |
677 | #include "XSUB.h" |
678 | ||
679 | XS(XS_mro_get_linear_isa); | |
680 | XS(XS_mro_set_mro); | |
681 | XS(XS_mro_get_mro); | |
682 | XS(XS_mro_get_isarev); | |
683 | XS(XS_mro_is_universal); | |
c5860d66 | 684 | XS(XS_mro_invalidate_method_caches); |
e1a479c5 | 685 | XS(XS_mro_method_changed_in); |
70cd14a1 | 686 | XS(XS_mro_get_pkg_gen); |
f58cd386 | 687 | XS(XS_mro_nextcan); |
e1a479c5 BB |
688 | |
689 | void | |
690 | Perl_boot_core_mro(pTHX) | |
691 | { | |
692 | dVAR; | |
693 | static const char file[] = __FILE__; | |
694 | ||
695 | newXSproto("mro::get_linear_isa", XS_mro_get_linear_isa, file, "$;$"); | |
696 | newXSproto("mro::set_mro", XS_mro_set_mro, file, "$$"); | |
697 | newXSproto("mro::get_mro", XS_mro_get_mro, file, "$"); | |
698 | newXSproto("mro::get_isarev", XS_mro_get_isarev, file, "$"); | |
699 | newXSproto("mro::is_universal", XS_mro_is_universal, file, "$"); | |
c5860d66 | 700 | newXSproto("mro::invalidate_all_method_caches", XS_mro_invalidate_method_caches, file, ""); |
e1a479c5 | 701 | newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$"); |
70cd14a1 | 702 | newXSproto("mro::get_pkg_gen", XS_mro_get_pkg_gen, file, "$"); |
f58cd386 | 703 | newXS("mro::_nextcan", XS_mro_nextcan, file); |
e1a479c5 BB |
704 | } |
705 | ||
706 | XS(XS_mro_get_linear_isa) { | |
707 | dVAR; | |
708 | dXSARGS; | |
709 | AV* RETVAL; | |
710 | HV* class_stash; | |
711 | SV* classname; | |
712 | ||
713 | PERL_UNUSED_ARG(cv); | |
714 | ||
715 | if(items < 1 || items > 2) | |
716 | Perl_croak(aTHX_ "Usage: mro::get_linear_isa(classname [, type ])"); | |
717 | ||
718 | classname = ST(0); | |
719 | class_stash = gv_stashsv(classname, 0); | |
e1a479c5 | 720 | |
70cd14a1 CB |
721 | if(!class_stash) { |
722 | /* No stash exists yet, give them just the classname */ | |
723 | AV* isalin = newAV(); | |
724 | av_push(isalin, newSVsv(classname)); | |
725 | ST(0) = sv_2mortal(newRV_noinc((SV*)isalin)); | |
726 | XSRETURN(1); | |
727 | } | |
728 | else if(items > 1) { | |
1e05feb3 | 729 | const char* const which = SvPV_nolen(ST(1)); |
3d76853f NC |
730 | const struct mro_alg *const algo = S_get_mro_from_name(aTHX_ which); |
731 | if (!algo) | |
732 | Perl_croak(aTHX_ "Invalid mro name: '%s'", which); | |
84dccb35 | 733 | RETVAL = algo->resolve(aTHX_ class_stash, 0); |
e1a479c5 BB |
734 | } |
735 | else { | |
736 | RETVAL = mro_get_linear_isa(class_stash); | |
737 | } | |
738 | ||
739 | ST(0) = newRV_inc((SV*)RETVAL); | |
740 | sv_2mortal(ST(0)); | |
741 | XSRETURN(1); | |
742 | } | |
743 | ||
744 | XS(XS_mro_set_mro) | |
745 | { | |
746 | dVAR; | |
747 | dXSARGS; | |
748 | SV* classname; | |
3d76853f NC |
749 | const char* whichstr; |
750 | const struct mro_alg *which; | |
e1a479c5 BB |
751 | HV* class_stash; |
752 | struct mro_meta* meta; | |
753 | ||
754 | PERL_UNUSED_ARG(cv); | |
755 | ||
756 | if (items != 2) | |
757 | Perl_croak(aTHX_ "Usage: mro::set_mro(classname, type)"); | |
758 | ||
759 | classname = ST(0); | |
760 | whichstr = SvPV_nolen(ST(1)); | |
761 | class_stash = gv_stashsv(classname, GV_ADD); | |
762 | if(!class_stash) Perl_croak(aTHX_ "Cannot create class: '%"SVf"'!", SVfARG(classname)); | |
763 | meta = HvMROMETA(class_stash); | |
764 | ||
3d76853f NC |
765 | which = S_get_mro_from_name(aTHX_ whichstr); |
766 | if (!which) | |
e1a479c5 BB |
767 | Perl_croak(aTHX_ "Invalid mro name: '%s'", whichstr); |
768 | ||
769 | if(meta->mro_which != which) { | |
770 | meta->mro_which = which; | |
771 | /* Only affects local method cache, not | |
772 | even child classes */ | |
dd69841b | 773 | meta->cache_gen++; |
e1a479c5 BB |
774 | if(meta->mro_nextmethod) |
775 | hv_clear(meta->mro_nextmethod); | |
776 | } | |
777 | ||
778 | XSRETURN_EMPTY; | |
779 | } | |
780 | ||
781 | ||
782 | XS(XS_mro_get_mro) | |
783 | { | |
784 | dVAR; | |
785 | dXSARGS; | |
786 | SV* classname; | |
787 | HV* class_stash; | |
e1a479c5 BB |
788 | |
789 | PERL_UNUSED_ARG(cv); | |
790 | ||
791 | if (items != 1) | |
792 | Perl_croak(aTHX_ "Usage: mro::get_mro(classname)"); | |
793 | ||
794 | classname = ST(0); | |
795 | class_stash = gv_stashsv(classname, 0); | |
e1a479c5 | 796 | |
3d76853f NC |
797 | ST(0) = sv_2mortal(newSVpv(class_stash |
798 | ? HvMROMETA(class_stash)->mro_which->name | |
799 | : "dfs", 0)); | |
e1a479c5 BB |
800 | XSRETURN(1); |
801 | } | |
802 | ||
803 | XS(XS_mro_get_isarev) | |
804 | { | |
805 | dVAR; | |
806 | dXSARGS; | |
807 | SV* classname; | |
73968c7a | 808 | HE* he; |
e1a479c5 | 809 | HV* isarev; |
70cd14a1 | 810 | AV* ret_array; |
e1a479c5 BB |
811 | |
812 | PERL_UNUSED_ARG(cv); | |
813 | ||
814 | if (items != 1) | |
815 | Perl_croak(aTHX_ "Usage: mro::get_isarev(classname)"); | |
816 | ||
817 | classname = ST(0); | |
818 | ||
e1a479c5 | 819 | SP -= items; |
dd69841b | 820 | |
70cd14a1 | 821 | |
73968c7a NC |
822 | he = hv_fetch_ent(PL_isarev, classname, 0, 0); |
823 | isarev = he ? (HV*)HeVAL(he) : NULL; | |
70cd14a1 CB |
824 | |
825 | ret_array = newAV(); | |
dd69841b | 826 | if(isarev) { |
e1a479c5 BB |
827 | HE* iter; |
828 | hv_iterinit(isarev); | |
829 | while((iter = hv_iternext(isarev))) | |
70cd14a1 | 830 | av_push(ret_array, newSVsv(hv_iterkeysv(iter))); |
e1a479c5 | 831 | } |
70cd14a1 | 832 | XPUSHs(sv_2mortal(newRV_noinc((SV*)ret_array))); |
e1a479c5 BB |
833 | |
834 | PUTBACK; | |
835 | return; | |
836 | } | |
837 | ||
838 | XS(XS_mro_is_universal) | |
839 | { | |
840 | dVAR; | |
841 | dXSARGS; | |
842 | SV* classname; | |
dd69841b | 843 | HV* isarev; |
70cd14a1 CB |
844 | char* classname_pv; |
845 | STRLEN classname_len; | |
73968c7a | 846 | HE* he; |
e1a479c5 BB |
847 | |
848 | PERL_UNUSED_ARG(cv); | |
849 | ||
850 | if (items != 1) | |
dd69841b | 851 | Perl_croak(aTHX_ "Usage: mro::is_universal(classname)"); |
e1a479c5 BB |
852 | |
853 | classname = ST(0); | |
e1a479c5 | 854 | |
cfff9797 | 855 | classname_pv = SvPV(classname,classname_len); |
dd69841b | 856 | |
73968c7a NC |
857 | he = hv_fetch_ent(PL_isarev, classname, 0, 0); |
858 | isarev = he ? (HV*)HeVAL(he) : NULL; | |
dd69841b | 859 | |
70cd14a1 | 860 | if((classname_len == 9 && strEQ(classname_pv, "UNIVERSAL")) |
dd69841b | 861 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) |
9edc5bb8 RGS |
862 | XSRETURN_YES; |
863 | else | |
864 | XSRETURN_NO; | |
e1a479c5 BB |
865 | } |
866 | ||
c5860d66 | 867 | XS(XS_mro_invalidate_method_caches) |
e1a479c5 BB |
868 | { |
869 | dVAR; | |
870 | dXSARGS; | |
871 | ||
872 | PERL_UNUSED_ARG(cv); | |
873 | ||
874 | if (items != 0) | |
875 | Perl_croak(aTHX_ "Usage: mro::invalidate_all_method_caches()"); | |
876 | ||
877 | PL_sub_generation++; | |
878 | ||
879 | XSRETURN_EMPTY; | |
880 | } | |
881 | ||
e1a479c5 BB |
882 | XS(XS_mro_method_changed_in) |
883 | { | |
884 | dVAR; | |
885 | dXSARGS; | |
886 | SV* classname; | |
887 | HV* class_stash; | |
888 | ||
889 | PERL_UNUSED_ARG(cv); | |
890 | ||
891 | if(items != 1) | |
892 | Perl_croak(aTHX_ "Usage: mro::method_changed_in(classname)"); | |
893 | ||
894 | classname = ST(0); | |
895 | ||
896 | class_stash = gv_stashsv(classname, 0); | |
897 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
898 | ||
899 | mro_method_changed_in(class_stash); | |
900 | ||
901 | XSRETURN_EMPTY; | |
902 | } | |
903 | ||
70cd14a1 CB |
904 | XS(XS_mro_get_pkg_gen) |
905 | { | |
906 | dVAR; | |
907 | dXSARGS; | |
908 | SV* classname; | |
909 | HV* class_stash; | |
910 | ||
911 | PERL_UNUSED_ARG(cv); | |
912 | ||
913 | if(items != 1) | |
914 | Perl_croak(aTHX_ "Usage: mro::get_pkg_gen(classname)"); | |
915 | ||
916 | classname = ST(0); | |
917 | ||
918 | class_stash = gv_stashsv(classname, 0); | |
919 | ||
920 | SP -= items; | |
921 | ||
922 | XPUSHs(sv_2mortal(newSViv( | |
923 | class_stash ? HvMROMETA(class_stash)->pkg_gen : 0 | |
924 | ))); | |
925 | ||
926 | PUTBACK; | |
927 | return; | |
928 | } | |
929 | ||
f58cd386 | 930 | XS(XS_mro_nextcan) |
e1a479c5 BB |
931 | { |
932 | dVAR; | |
933 | dXSARGS; | |
f58cd386 BB |
934 | SV* self = ST(0); |
935 | const I32 throw_nomethod = SvIVX(ST(1)); | |
bbd28cb9 | 936 | register I32 cxix = cxstack_ix; |
f58cd386 BB |
937 | register const PERL_CONTEXT *ccstack = cxstack; |
938 | const PERL_SI *top_si = PL_curstackinfo; | |
939 | HV* selfstash; | |
940 | SV *stashname; | |
941 | const char *fq_subname; | |
942 | const char *subname; | |
943 | STRLEN stashname_len; | |
944 | STRLEN subname_len; | |
945 | SV* sv; | |
946 | GV** gvp; | |
947 | AV* linear_av; | |
948 | SV** linear_svp; | |
949 | const char *hvname; | |
950 | I32 entries; | |
951 | struct mro_meta* selfmeta; | |
952 | HV* nmcache; | |
bbd28cb9 | 953 | I32 i; |
e1a479c5 | 954 | |
48fc4736 JH |
955 | PERL_UNUSED_ARG(cv); |
956 | ||
f58cd386 BB |
957 | SP -= items; |
958 | ||
959 | if(sv_isobject(self)) | |
960 | selfstash = SvSTASH(SvRV(self)); | |
961 | else | |
962 | selfstash = gv_stashsv(self, 0); | |
963 | ||
964 | assert(selfstash); | |
965 | ||
966 | hvname = HvNAME_get(selfstash); | |
967 | if (!hvname) | |
968 | Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); | |
969 | ||
f58cd386 BB |
970 | /* This block finds the contextually-enclosing fully-qualified subname, |
971 | much like looking at (caller($i))[3] until you find a real sub that | |
bbd28cb9 BB |
972 | isn't ANON, etc (also skips over pureperl next::method, etc) */ |
973 | for(i = 0; i < 2; i++) { | |
974 | cxix = __dopoptosub_at(ccstack, cxix); | |
975 | for (;;) { | |
976 | GV* cvgv; | |
977 | STRLEN fq_subname_len; | |
978 | ||
979 | /* we may be in a higher stacklevel, so dig down deeper */ | |
980 | while (cxix < 0) { | |
981 | if(top_si->si_type == PERLSI_MAIN) | |
982 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method must be used in method context"); | |
983 | top_si = top_si->si_prev; | |
984 | ccstack = top_si->si_cxstack; | |
985 | cxix = __dopoptosub_at(ccstack, top_si->si_cxix); | |
986 | } | |
f58cd386 | 987 | |
bbd28cb9 BB |
988 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB |
989 | || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) { | |
990 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
991 | continue; | |
992 | } | |
e1a479c5 | 993 | |
bbd28cb9 BB |
994 | { |
995 | const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1); | |
996 | if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) { | |
997 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) { | |
998 | cxix = dbcxix; | |
999 | continue; | |
1000 | } | |
f58cd386 BB |
1001 | } |
1002 | } | |
f58cd386 | 1003 | |
bbd28cb9 | 1004 | cvgv = CvGV(ccstack[cxix].blk_sub.cv); |
f58cd386 | 1005 | |
bbd28cb9 BB |
1006 | if(!isGV(cvgv)) { |
1007 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
1008 | continue; | |
1009 | } | |
f58cd386 | 1010 | |
bbd28cb9 BB |
1011 | /* we found a real sub here */ |
1012 | sv = sv_2mortal(newSV(0)); | |
f58cd386 | 1013 | |
bbd28cb9 | 1014 | gv_efullname3(sv, cvgv, NULL); |
f58cd386 | 1015 | |
bbd28cb9 BB |
1016 | fq_subname = SvPVX(sv); |
1017 | fq_subname_len = SvCUR(sv); | |
f58cd386 | 1018 | |
bbd28cb9 BB |
1019 | subname = strrchr(fq_subname, ':'); |
1020 | if(!subname) | |
1021 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method"); | |
f58cd386 | 1022 | |
bbd28cb9 BB |
1023 | subname++; |
1024 | subname_len = fq_subname_len - (subname - fq_subname); | |
1025 | if(subname_len == 8 && strEQ(subname, "__ANON__")) { | |
1026 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
1027 | continue; | |
1028 | } | |
1029 | break; | |
f58cd386 | 1030 | } |
bbd28cb9 | 1031 | cxix--; |
e1a479c5 | 1032 | } |
f58cd386 BB |
1033 | |
1034 | /* If we made it to here, we found our context */ | |
1035 | ||
1036 | /* Initialize the next::method cache for this stash | |
1037 | if necessary */ | |
1038 | selfmeta = HvMROMETA(selfstash); | |
1039 | if(!(nmcache = selfmeta->mro_nextmethod)) { | |
1040 | nmcache = selfmeta->mro_nextmethod = newHV(); | |
1041 | } | |
1042 | else { /* Use the cached coderef if it exists */ | |
1043 | HE* cache_entry = hv_fetch_ent(nmcache, sv, 0, 0); | |
1044 | if (cache_entry) { | |
1045 | SV* const val = HeVAL(cache_entry); | |
1046 | if(val == &PL_sv_undef) { | |
1047 | if(throw_nomethod) | |
1048 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); | |
1049 | XSRETURN_EMPTY; | |
1050 | } | |
1051 | XPUSHs(sv_2mortal(newRV_inc(val))); | |
1052 | XSRETURN(1); | |
1053 | } | |
e1a479c5 BB |
1054 | } |
1055 | ||
f58cd386 | 1056 | /* beyond here is just for cache misses, so perf isn't as critical */ |
e1a479c5 | 1057 | |
f58cd386 BB |
1058 | stashname_len = subname - fq_subname - 2; |
1059 | stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len)); | |
e1a479c5 | 1060 | |
f58cd386 | 1061 | linear_av = mro_get_linear_isa_c3(selfstash, 0); /* has ourselves at the top of the list */ |
e1a479c5 | 1062 | |
f58cd386 BB |
1063 | linear_svp = AvARRAY(linear_av); |
1064 | entries = AvFILLp(linear_av) + 1; | |
e1a479c5 | 1065 | |
f58cd386 BB |
1066 | /* Walk down our MRO, skipping everything up |
1067 | to the contextually enclosing class */ | |
1068 | while (entries--) { | |
1069 | SV * const linear_sv = *linear_svp++; | |
1070 | assert(linear_sv); | |
1071 | if(sv_eq(linear_sv, stashname)) | |
1072 | break; | |
1073 | } | |
e1a479c5 | 1074 | |
f58cd386 BB |
1075 | /* Now search the remainder of the MRO for the |
1076 | same method name as the contextually enclosing | |
1077 | method */ | |
1078 | if(entries > 0) { | |
1079 | while (entries--) { | |
1080 | SV * const linear_sv = *linear_svp++; | |
1081 | HV* curstash; | |
1082 | GV* candidate; | |
1083 | CV* cand_cv; | |
e1a479c5 | 1084 | |
f58cd386 BB |
1085 | assert(linear_sv); |
1086 | curstash = gv_stashsv(linear_sv, FALSE); | |
1087 | ||
1088 | if (!curstash) { | |
1089 | if (ckWARN(WARN_SYNTAX)) | |
1090 | Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA", | |
1091 | (void*)linear_sv, hvname); | |
1092 | continue; | |
1093 | } | |
1094 | ||
1095 | assert(curstash); | |
1096 | ||
1097 | gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0); | |
1098 | if (!gvp) continue; | |
1099 | ||
1100 | candidate = *gvp; | |
1101 | assert(candidate); | |
1102 | ||
1103 | if (SvTYPE(candidate) != SVt_PVGV) | |
1104 | gv_init(candidate, curstash, subname, subname_len, TRUE); | |
1105 | ||
1106 | /* Notably, we only look for real entries, not method cache | |
1107 | entries, because in C3 the method cache of a parent is not | |
1108 | valid for the child */ | |
1109 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { | |
1110 | SvREFCNT_inc_simple_void_NN((SV*)cand_cv); | |
04fe65b0 | 1111 | (void)hv_store_ent(nmcache, newSVsv(sv), (SV*)cand_cv, 0); |
f58cd386 BB |
1112 | XPUSHs(sv_2mortal(newRV_inc((SV*)cand_cv))); |
1113 | XSRETURN(1); | |
1114 | } | |
1115 | } | |
e1a479c5 BB |
1116 | } |
1117 | ||
04fe65b0 | 1118 | (void)hv_store_ent(nmcache, newSVsv(sv), &PL_sv_undef, 0); |
f58cd386 BB |
1119 | if(throw_nomethod) |
1120 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); | |
1121 | XSRETURN_EMPTY; | |
e1a479c5 BB |
1122 | } |
1123 | ||
1124 | /* | |
1125 | * Local variables: | |
1126 | * c-indentation-style: bsd | |
1127 | * c-basic-offset: 4 | |
1128 | * indent-tabs-mode: t | |
1129 | * End: | |
1130 | * | |
1131 | * ex: set ts=8 sts=4 sw=4 noet: | |
1132 | */ |