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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; | |
e1a479c5 BB |
120 | const char* stashname; |
121 | struct mro_meta* meta; | |
122 | ||
123 | assert(stash); | |
124 | assert(HvAUX(stash)); | |
125 | ||
126 | stashname = HvNAME_get(stash); | |
127 | if (!stashname) | |
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'", | |
132 | stashname); | |
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 NC |
143 | retval = (AV*)sv_2mortal((SV *)newAV()); |
144 | av_push(retval, newSVpv(stashname, 0)); /* 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; | |
234 | const char* stashname; | |
235 | STRLEN stashname_len; | |
236 | struct mro_meta* meta; | |
237 | ||
238 | assert(stash); | |
239 | assert(HvAUX(stash)); | |
240 | ||
241 | stashname = HvNAME_get(stash); | |
242 | stashname_len = HvNAMELEN_get(stash); | |
243 | if (!stashname) | |
1e05feb3 | 244 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); |
e1a479c5 BB |
245 | |
246 | if (level > 100) | |
247 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", | |
248 | stashname); | |
249 | ||
250 | meta = HvMROMETA(stash); | |
1c908217 RGS |
251 | |
252 | /* return cache if valid */ | |
e1a479c5 | 253 | if((retval = meta->mro_linear_c3)) { |
e1a479c5 BB |
254 | return retval; |
255 | } | |
256 | ||
257 | /* not in cache, make a new one */ | |
258 | ||
e1a479c5 BB |
259 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); |
260 | isa = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; | |
261 | ||
1c908217 RGS |
262 | /* For a better idea how the rest of this works, see the much clearer |
263 | pure perl version in Algorithm::C3 0.01: | |
264 | http://search.cpan.org/src/STEVAN/Algorithm-C3-0.01/lib/Algorithm/C3.pm | |
265 | (later versions go about it differently than this code for speed reasons) | |
266 | */ | |
8638e433 | 267 | |
e1a479c5 BB |
268 | if(isa && AvFILLp(isa) >= 0) { |
269 | SV** seqs_ptr; | |
270 | I32 seqs_items; | |
1e05feb3 AL |
271 | HV* const tails = (HV*)sv_2mortal((SV*)newHV()); |
272 | AV* const seqs = (AV*)sv_2mortal((SV*)newAV()); | |
8638e433 RGS |
273 | I32* heads; |
274 | ||
275 | /* This builds @seqs, which is an array of arrays. | |
276 | The members of @seqs are the MROs of | |
277 | the members of @ISA, followed by @ISA itself. | |
278 | */ | |
e1a479c5 BB |
279 | I32 items = AvFILLp(isa) + 1; |
280 | SV** isa_ptr = AvARRAY(isa); | |
281 | while(items--) { | |
1e05feb3 AL |
282 | SV* const isa_item = *isa_ptr++; |
283 | HV* const isa_item_stash = gv_stashsv(isa_item, 0); | |
e1a479c5 | 284 | if(!isa_item_stash) { |
8638e433 RGS |
285 | /* if no stash, make a temporary fake MRO |
286 | containing just itself */ | |
70cd14a1 | 287 | AV* const isa_lin = newAV(); |
e1a479c5 | 288 | av_push(isa_lin, newSVsv(isa_item)); |
70cd14a1 | 289 | av_push(seqs, (SV*)isa_lin); |
e1a479c5 BB |
290 | } |
291 | else { | |
70cd14a1 CB |
292 | /* recursion */ |
293 | AV* const isa_lin = mro_get_linear_isa_c3(isa_item_stash, level + 1); | |
294 | av_push(seqs, SvREFCNT_inc_simple_NN((SV*)isa_lin)); | |
e1a479c5 | 295 | } |
e1a479c5 | 296 | } |
1dcae283 | 297 | av_push(seqs, SvREFCNT_inc_simple_NN((SV*)isa)); |
8638e433 RGS |
298 | |
299 | /* This builds "heads", which as an array of integer array | |
300 | indices, one per seq, which point at the virtual "head" | |
301 | of the seq (initially zero) */ | |
302 | Newxz(heads, AvFILLp(seqs)+1, I32); | |
303 | ||
304 | /* This builds %tails, which has one key for every class | |
305 | mentioned in the tail of any sequence in @seqs (tail meaning | |
306 | everything after the first class, the "head"). The value | |
307 | is how many times this key appears in the tails of @seqs. | |
308 | */ | |
e1a479c5 BB |
309 | seqs_ptr = AvARRAY(seqs); |
310 | seqs_items = AvFILLp(seqs) + 1; | |
311 | while(seqs_items--) { | |
1e05feb3 | 312 | AV* const seq = (AV*)*seqs_ptr++; |
e1a479c5 BB |
313 | I32 seq_items = AvFILLp(seq); |
314 | if(seq_items > 0) { | |
315 | SV** seq_ptr = AvARRAY(seq) + 1; | |
316 | while(seq_items--) { | |
1e05feb3 AL |
317 | SV* const seqitem = *seq_ptr++; |
318 | HE* const he = hv_fetch_ent(tails, seqitem, 0, 0); | |
e1a479c5 | 319 | if(!he) { |
04fe65b0 | 320 | (void)hv_store_ent(tails, seqitem, newSViv(1), 0); |
e1a479c5 BB |
321 | } |
322 | else { | |
1e05feb3 | 323 | SV* const val = HeVAL(he); |
e1a479c5 BB |
324 | sv_inc(val); |
325 | } | |
326 | } | |
327 | } | |
328 | } | |
329 | ||
1dcae283 BB |
330 | /* Initialize retval to build the return value in */ |
331 | retval = newAV(); | |
332 | av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */ | |
333 | ||
8638e433 RGS |
334 | /* This loop won't terminate until we either finish building |
335 | the MRO, or get an exception. */ | |
e1a479c5 | 336 | while(1) { |
e1a479c5 BB |
337 | SV* cand = NULL; |
338 | SV* winner = NULL; | |
8638e433 RGS |
339 | int s; |
340 | ||
341 | /* "foreach $seq (@seqs)" */ | |
1e05feb3 | 342 | SV** const avptr = AvARRAY(seqs); |
8638e433 | 343 | for(s = 0; s <= AvFILLp(seqs); s++) { |
e1a479c5 | 344 | SV** svp; |
1e05feb3 AL |
345 | AV * const seq = (AV*)(avptr[s]); |
346 | SV* seqhead; | |
8638e433 RGS |
347 | if(!seq) continue; /* skip empty seqs */ |
348 | svp = av_fetch(seq, heads[s], 0); | |
349 | seqhead = *svp; /* seqhead = head of this seq */ | |
e1a479c5 | 350 | if(!winner) { |
1e05feb3 AL |
351 | HE* tail_entry; |
352 | SV* val; | |
8638e433 RGS |
353 | /* if we haven't found a winner for this round yet, |
354 | and this seqhead is not in tails (or the count | |
355 | for it in tails has dropped to zero), then this | |
356 | seqhead is our new winner, and is added to the | |
357 | final MRO immediately */ | |
e1a479c5 BB |
358 | cand = seqhead; |
359 | if((tail_entry = hv_fetch_ent(tails, cand, 0, 0)) | |
360 | && (val = HeVAL(tail_entry)) | |
25270bc0 | 361 | && (SvIVX(val) > 0)) |
e1a479c5 BB |
362 | continue; |
363 | winner = newSVsv(cand); | |
364 | av_push(retval, winner); | |
8638e433 RGS |
365 | /* note however that even when we find a winner, |
366 | we continue looping over @seqs to do housekeeping */ | |
e1a479c5 BB |
367 | } |
368 | if(!sv_cmp(seqhead, winner)) { | |
8638e433 RGS |
369 | /* Once we have a winner (including the iteration |
370 | where we first found him), inc the head ptr | |
371 | for any seq which had the winner as a head, | |
372 | NULL out any seq which is now empty, | |
373 | and adjust tails for consistency */ | |
374 | ||
1e05feb3 | 375 | const int new_head = ++heads[s]; |
8638e433 | 376 | if(new_head > AvFILLp(seq)) { |
1dcae283 | 377 | SvREFCNT_dec(avptr[s]); |
8638e433 RGS |
378 | avptr[s] = NULL; |
379 | } | |
380 | else { | |
1e05feb3 AL |
381 | HE* tail_entry; |
382 | SV* val; | |
8638e433 RGS |
383 | /* Because we know this new seqhead used to be |
384 | a tail, we can assume it is in tails and has | |
385 | a positive value, which we need to dec */ | |
386 | svp = av_fetch(seq, new_head, 0); | |
387 | seqhead = *svp; | |
388 | tail_entry = hv_fetch_ent(tails, seqhead, 0, 0); | |
389 | val = HeVAL(tail_entry); | |
390 | sv_dec(val); | |
391 | } | |
e1a479c5 BB |
392 | } |
393 | } | |
8638e433 RGS |
394 | |
395 | /* if we found no candidates, we are done building the MRO. | |
396 | !cand means no seqs have any entries left to check */ | |
397 | if(!cand) { | |
398 | Safefree(heads); | |
399 | break; | |
400 | } | |
401 | ||
402 | /* If we had candidates, but nobody won, then the @ISA | |
403 | hierarchy is not C3-incompatible */ | |
e1a479c5 | 404 | if(!winner) { |
8638e433 | 405 | /* we have to do some cleanup before we croak */ |
8638e433 | 406 | |
e1a479c5 | 407 | SvREFCNT_dec(retval); |
8638e433 RGS |
408 | Safefree(heads); |
409 | ||
e1a479c5 BB |
410 | Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': " |
411 | "merging failed on parent '%"SVf"'", stashname, SVfARG(cand)); | |
412 | } | |
413 | } | |
414 | } | |
1dcae283 BB |
415 | else { /* @ISA was undefined or empty */ |
416 | /* build a retval containing only ourselves */ | |
417 | retval = newAV(); | |
418 | av_push(retval, newSVpvn(stashname, stashname_len)); | |
419 | } | |
e1a479c5 | 420 | |
1c908217 RGS |
421 | /* we don't want anyone modifying the cache entry but us, |
422 | and we do so by replacing it completely */ | |
e1a479c5 | 423 | SvREADONLY_on(retval); |
1c908217 | 424 | |
e1a479c5 BB |
425 | meta->mro_linear_c3 = retval; |
426 | return retval; | |
427 | } | |
428 | ||
429 | /* | |
430 | =for apidoc mro_get_linear_isa | |
431 | ||
432 | Returns either C<mro_get_linear_isa_c3> or | |
433 | C<mro_get_linear_isa_dfs> for the given stash, | |
434 | dependant upon which MRO is in effect | |
435 | for that stash. The return value is a | |
436 | read-only AV*. | |
437 | ||
1c908217 RGS |
438 | You are responsible for C<SvREFCNT_inc()> on the |
439 | return value if you plan to store it anywhere | |
440 | semi-permanently (otherwise it might be deleted | |
441 | out from under you the next time the cache is | |
442 | invalidated). | |
443 | ||
e1a479c5 BB |
444 | =cut |
445 | */ | |
446 | AV* | |
447 | Perl_mro_get_linear_isa(pTHX_ HV *stash) | |
448 | { | |
449 | struct mro_meta* meta; | |
2c7f4b87 | 450 | |
e1a479c5 | 451 | assert(stash); |
2c7f4b87 BB |
452 | if(!SvOOK(stash)) |
453 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); | |
e1a479c5 BB |
454 | |
455 | meta = HvMROMETA(stash); | |
3d76853f | 456 | if (!meta->mro_which) |
14f97ce6 | 457 | Perl_croak(aTHX_ "panic: invalid MRO!"); |
3d76853f | 458 | return meta->mro_which->resolve(aTHX_ stash, 0); |
e1a479c5 BB |
459 | } |
460 | ||
461 | /* | |
462 | =for apidoc mro_isa_changed_in | |
463 | ||
1c908217 | 464 | Takes the necessary steps (cache invalidations, mostly) |
e1a479c5 BB |
465 | when the @ISA of the given package has changed. Invoked |
466 | by the C<setisa> magic, should not need to invoke directly. | |
467 | ||
468 | =cut | |
469 | */ | |
470 | void | |
471 | Perl_mro_isa_changed_in(pTHX_ HV* stash) | |
472 | { | |
473 | dVAR; | |
474 | HV* isarev; | |
475 | AV* linear_mro; | |
476 | HE* iter; | |
477 | SV** svp; | |
478 | I32 items; | |
1e05feb3 | 479 | bool is_universal; |
2c7f4b87 | 480 | struct mro_meta * meta; |
e1a479c5 | 481 | |
0fa56319 RGS |
482 | const char * const stashname = HvNAME_get(stash); |
483 | const STRLEN stashname_len = HvNAMELEN_get(stash); | |
e1a479c5 | 484 | |
2c7f4b87 BB |
485 | if(!stashname) |
486 | Perl_croak(aTHX_ "Can't call mro_isa_changed_in() on anonymous symbol table"); | |
487 | ||
e1a479c5 | 488 | /* wipe out the cached linearizations for this stash */ |
2c7f4b87 | 489 | meta = HvMROMETA(stash); |
e1a479c5 BB |
490 | SvREFCNT_dec((SV*)meta->mro_linear_dfs); |
491 | SvREFCNT_dec((SV*)meta->mro_linear_c3); | |
492 | meta->mro_linear_dfs = NULL; | |
493 | meta->mro_linear_c3 = NULL; | |
494 | ||
70cd14a1 CB |
495 | /* Inc the package generation, since our @ISA changed */ |
496 | meta->pkg_gen++; | |
497 | ||
e1a479c5 BB |
498 | /* Wipe the global method cache if this package |
499 | is UNIVERSAL or one of its parents */ | |
dd69841b BB |
500 | |
501 | svp = hv_fetch(PL_isarev, stashname, stashname_len, 0); | |
502 | isarev = svp ? (HV*)*svp : NULL; | |
503 | ||
504 | if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL")) | |
505 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) { | |
e1a479c5 | 506 | PL_sub_generation++; |
dd69841b BB |
507 | is_universal = TRUE; |
508 | } | |
1e05feb3 | 509 | else { /* Wipe the local method cache otherwise */ |
dd69841b | 510 | meta->cache_gen++; |
1e05feb3 AL |
511 | is_universal = FALSE; |
512 | } | |
e1a479c5 BB |
513 | |
514 | /* wipe next::method cache too */ | |
515 | if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod); | |
1e05feb3 | 516 | |
e1a479c5 BB |
517 | /* Iterate the isarev (classes that are our children), |
518 | wiping out their linearization and method caches */ | |
dd69841b | 519 | if(isarev) { |
e1a479c5 BB |
520 | hv_iterinit(isarev); |
521 | while((iter = hv_iternext(isarev))) { | |
1e05feb3 | 522 | SV* const revkey = hv_iterkeysv(iter); |
e1a479c5 | 523 | HV* revstash = gv_stashsv(revkey, 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 | ||
1e05feb3 | 554 | HE *he = hv_fetch_ent(PL_isarev, sv, 0, 0); |
dd69841b BB |
555 | if(!he) { |
556 | he = hv_store_ent(PL_isarev, sv, (SV*)newHV(), 0); | |
e1a479c5 | 557 | } |
dd69841b | 558 | mroisarev = (HV*)HeVAL(he); |
e1a479c5 | 559 | |
25270bc0 NC |
560 | /* This hash only ever contains PL_sv_yes. Storing it over itself is |
561 | almost as cheap as calling hv_exists, so on aggregate we expect to | |
562 | save time by not making two calls to the common HV code for the | |
563 | case where it doesn't exist. */ | |
564 | ||
04fe65b0 | 565 | (void)hv_store(mroisarev, stashname, stashname_len, &PL_sv_yes, 0); |
e1a479c5 BB |
566 | |
567 | if(isarev) { | |
568 | hv_iterinit(isarev); | |
569 | while((iter = hv_iternext(isarev))) { | |
dd69841b | 570 | I32 revkeylen; |
1e05feb3 | 571 | char* const revkey = hv_iterkey(iter, &revkeylen); |
04fe65b0 | 572 | (void)hv_store(mroisarev, revkey, revkeylen, &PL_sv_yes, 0); |
e1a479c5 BB |
573 | } |
574 | } | |
575 | } | |
576 | } | |
577 | ||
578 | /* | |
579 | =for apidoc mro_method_changed_in | |
580 | ||
47c9dd14 BB |
581 | Invalidates method caching on any child classes |
582 | of the given stash, so that they might notice | |
583 | the changes in this one. | |
e1a479c5 BB |
584 | |
585 | Ideally, all instances of C<PL_sub_generation++> in | |
dd69841b BB |
586 | perl source outside of C<mro.c> should be |
587 | replaced by calls to this. | |
588 | ||
589 | Perl automatically handles most of the common | |
590 | ways a method might be redefined. However, there | |
591 | are a few ways you could change a method in a stash | |
592 | without the cache code noticing, in which case you | |
593 | need to call this method afterwards: | |
e1a479c5 | 594 | |
dd69841b BB |
595 | 1) Directly manipulating the stash HV entries from |
596 | XS code. | |
e1a479c5 | 597 | |
dd69841b BB |
598 | 2) Assigning a reference to a readonly scalar |
599 | constant into a stash entry in order to create | |
600 | a constant subroutine (like constant.pm | |
601 | does). | |
602 | ||
603 | This same method is available from pure perl | |
604 | via, C<mro::method_changed_in(classname)>. | |
e1a479c5 BB |
605 | |
606 | =cut | |
607 | */ | |
608 | void | |
609 | Perl_mro_method_changed_in(pTHX_ HV *stash) | |
610 | { | |
1e05feb3 AL |
611 | const char * const stashname = HvNAME_get(stash); |
612 | const STRLEN stashname_len = HvNAMELEN_get(stash); | |
dd69841b | 613 | |
1e05feb3 AL |
614 | SV ** const svp = hv_fetch(PL_isarev, stashname, stashname_len, 0); |
615 | HV * const isarev = svp ? (HV*)*svp : NULL; | |
e1a479c5 | 616 | |
2c7f4b87 BB |
617 | if(!stashname) |
618 | Perl_croak(aTHX_ "Can't call mro_method_changed_in() on anonymous symbol table"); | |
619 | ||
70cd14a1 CB |
620 | /* Inc the package generation, since a local method changed */ |
621 | HvMROMETA(stash)->pkg_gen++; | |
622 | ||
e1a479c5 BB |
623 | /* If stash is UNIVERSAL, or one of UNIVERSAL's parents, |
624 | invalidate all method caches globally */ | |
dd69841b BB |
625 | if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL")) |
626 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) { | |
e1a479c5 BB |
627 | PL_sub_generation++; |
628 | return; | |
629 | } | |
630 | ||
631 | /* else, invalidate the method caches of all child classes, | |
632 | but not itself */ | |
dd69841b | 633 | if(isarev) { |
1e05feb3 AL |
634 | HE* iter; |
635 | ||
e1a479c5 BB |
636 | hv_iterinit(isarev); |
637 | while((iter = hv_iternext(isarev))) { | |
1e05feb3 AL |
638 | SV* const revkey = hv_iterkeysv(iter); |
639 | HV* const revstash = gv_stashsv(revkey, 0); | |
bc2cbbac BB |
640 | struct mro_meta* mrometa; |
641 | ||
642 | if(!revstash) continue; | |
643 | mrometa = HvMROMETA(revstash); | |
dd69841b | 644 | mrometa->cache_gen++; |
e1a479c5 BB |
645 | if(mrometa->mro_nextmethod) |
646 | hv_clear(mrometa->mro_nextmethod); | |
647 | } | |
648 | } | |
649 | } | |
650 | ||
651 | /* These two are static helpers for next::method and friends, | |
652 | and re-implement a bunch of the code from pp_caller() in | |
653 | a more efficient manner for this particular usage. | |
654 | */ | |
655 | ||
656 | STATIC I32 | |
657 | __dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) { | |
658 | I32 i; | |
659 | for (i = startingblock; i >= 0; i--) { | |
660 | if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i; | |
661 | } | |
662 | return i; | |
663 | } | |
664 | ||
e1a479c5 BB |
665 | #include "XSUB.h" |
666 | ||
667 | XS(XS_mro_get_linear_isa); | |
668 | XS(XS_mro_set_mro); | |
669 | XS(XS_mro_get_mro); | |
670 | XS(XS_mro_get_isarev); | |
671 | XS(XS_mro_is_universal); | |
c5860d66 | 672 | XS(XS_mro_invalidate_method_caches); |
e1a479c5 | 673 | XS(XS_mro_method_changed_in); |
70cd14a1 | 674 | XS(XS_mro_get_pkg_gen); |
f58cd386 | 675 | XS(XS_mro_nextcan); |
e1a479c5 BB |
676 | |
677 | void | |
678 | Perl_boot_core_mro(pTHX) | |
679 | { | |
680 | dVAR; | |
681 | static const char file[] = __FILE__; | |
682 | ||
683 | newXSproto("mro::get_linear_isa", XS_mro_get_linear_isa, file, "$;$"); | |
684 | newXSproto("mro::set_mro", XS_mro_set_mro, file, "$$"); | |
685 | newXSproto("mro::get_mro", XS_mro_get_mro, file, "$"); | |
686 | newXSproto("mro::get_isarev", XS_mro_get_isarev, file, "$"); | |
687 | newXSproto("mro::is_universal", XS_mro_is_universal, file, "$"); | |
c5860d66 | 688 | newXSproto("mro::invalidate_all_method_caches", XS_mro_invalidate_method_caches, file, ""); |
e1a479c5 | 689 | newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$"); |
70cd14a1 | 690 | newXSproto("mro::get_pkg_gen", XS_mro_get_pkg_gen, file, "$"); |
f58cd386 | 691 | newXS("mro::_nextcan", XS_mro_nextcan, file); |
e1a479c5 BB |
692 | } |
693 | ||
694 | XS(XS_mro_get_linear_isa) { | |
695 | dVAR; | |
696 | dXSARGS; | |
697 | AV* RETVAL; | |
698 | HV* class_stash; | |
699 | SV* classname; | |
700 | ||
701 | PERL_UNUSED_ARG(cv); | |
702 | ||
703 | if(items < 1 || items > 2) | |
704 | Perl_croak(aTHX_ "Usage: mro::get_linear_isa(classname [, type ])"); | |
705 | ||
706 | classname = ST(0); | |
707 | class_stash = gv_stashsv(classname, 0); | |
e1a479c5 | 708 | |
70cd14a1 CB |
709 | if(!class_stash) { |
710 | /* No stash exists yet, give them just the classname */ | |
711 | AV* isalin = newAV(); | |
712 | av_push(isalin, newSVsv(classname)); | |
713 | ST(0) = sv_2mortal(newRV_noinc((SV*)isalin)); | |
714 | XSRETURN(1); | |
715 | } | |
716 | else if(items > 1) { | |
1e05feb3 | 717 | const char* const which = SvPV_nolen(ST(1)); |
3d76853f NC |
718 | const struct mro_alg *const algo = S_get_mro_from_name(aTHX_ which); |
719 | if (!algo) | |
720 | Perl_croak(aTHX_ "Invalid mro name: '%s'", which); | |
84dccb35 | 721 | RETVAL = algo->resolve(aTHX_ class_stash, 0); |
e1a479c5 BB |
722 | } |
723 | else { | |
724 | RETVAL = mro_get_linear_isa(class_stash); | |
725 | } | |
726 | ||
727 | ST(0) = newRV_inc((SV*)RETVAL); | |
728 | sv_2mortal(ST(0)); | |
729 | XSRETURN(1); | |
730 | } | |
731 | ||
732 | XS(XS_mro_set_mro) | |
733 | { | |
734 | dVAR; | |
735 | dXSARGS; | |
736 | SV* classname; | |
3d76853f NC |
737 | const char* whichstr; |
738 | const struct mro_alg *which; | |
e1a479c5 BB |
739 | HV* class_stash; |
740 | struct mro_meta* meta; | |
741 | ||
742 | PERL_UNUSED_ARG(cv); | |
743 | ||
744 | if (items != 2) | |
745 | Perl_croak(aTHX_ "Usage: mro::set_mro(classname, type)"); | |
746 | ||
747 | classname = ST(0); | |
748 | whichstr = SvPV_nolen(ST(1)); | |
749 | class_stash = gv_stashsv(classname, GV_ADD); | |
750 | if(!class_stash) Perl_croak(aTHX_ "Cannot create class: '%"SVf"'!", SVfARG(classname)); | |
751 | meta = HvMROMETA(class_stash); | |
752 | ||
3d76853f NC |
753 | which = S_get_mro_from_name(aTHX_ whichstr); |
754 | if (!which) | |
e1a479c5 BB |
755 | Perl_croak(aTHX_ "Invalid mro name: '%s'", whichstr); |
756 | ||
757 | if(meta->mro_which != which) { | |
758 | meta->mro_which = which; | |
759 | /* Only affects local method cache, not | |
760 | even child classes */ | |
dd69841b | 761 | meta->cache_gen++; |
e1a479c5 BB |
762 | if(meta->mro_nextmethod) |
763 | hv_clear(meta->mro_nextmethod); | |
764 | } | |
765 | ||
766 | XSRETURN_EMPTY; | |
767 | } | |
768 | ||
769 | ||
770 | XS(XS_mro_get_mro) | |
771 | { | |
772 | dVAR; | |
773 | dXSARGS; | |
774 | SV* classname; | |
775 | HV* class_stash; | |
e1a479c5 BB |
776 | |
777 | PERL_UNUSED_ARG(cv); | |
778 | ||
779 | if (items != 1) | |
780 | Perl_croak(aTHX_ "Usage: mro::get_mro(classname)"); | |
781 | ||
782 | classname = ST(0); | |
783 | class_stash = gv_stashsv(classname, 0); | |
e1a479c5 | 784 | |
3d76853f NC |
785 | ST(0) = sv_2mortal(newSVpv(class_stash |
786 | ? HvMROMETA(class_stash)->mro_which->name | |
787 | : "dfs", 0)); | |
e1a479c5 BB |
788 | XSRETURN(1); |
789 | } | |
790 | ||
791 | XS(XS_mro_get_isarev) | |
792 | { | |
793 | dVAR; | |
794 | dXSARGS; | |
795 | SV* classname; | |
73968c7a | 796 | HE* he; |
e1a479c5 | 797 | HV* isarev; |
70cd14a1 | 798 | AV* ret_array; |
e1a479c5 BB |
799 | |
800 | PERL_UNUSED_ARG(cv); | |
801 | ||
802 | if (items != 1) | |
803 | Perl_croak(aTHX_ "Usage: mro::get_isarev(classname)"); | |
804 | ||
805 | classname = ST(0); | |
806 | ||
e1a479c5 | 807 | SP -= items; |
dd69841b | 808 | |
70cd14a1 | 809 | |
73968c7a NC |
810 | he = hv_fetch_ent(PL_isarev, classname, 0, 0); |
811 | isarev = he ? (HV*)HeVAL(he) : NULL; | |
70cd14a1 CB |
812 | |
813 | ret_array = newAV(); | |
dd69841b | 814 | if(isarev) { |
e1a479c5 BB |
815 | HE* iter; |
816 | hv_iterinit(isarev); | |
817 | while((iter = hv_iternext(isarev))) | |
70cd14a1 | 818 | av_push(ret_array, newSVsv(hv_iterkeysv(iter))); |
e1a479c5 | 819 | } |
70cd14a1 | 820 | XPUSHs(sv_2mortal(newRV_noinc((SV*)ret_array))); |
e1a479c5 BB |
821 | |
822 | PUTBACK; | |
823 | return; | |
824 | } | |
825 | ||
826 | XS(XS_mro_is_universal) | |
827 | { | |
828 | dVAR; | |
829 | dXSARGS; | |
830 | SV* classname; | |
dd69841b | 831 | HV* isarev; |
70cd14a1 CB |
832 | char* classname_pv; |
833 | STRLEN classname_len; | |
73968c7a | 834 | HE* he; |
e1a479c5 BB |
835 | |
836 | PERL_UNUSED_ARG(cv); | |
837 | ||
838 | if (items != 1) | |
dd69841b | 839 | Perl_croak(aTHX_ "Usage: mro::is_universal(classname)"); |
e1a479c5 BB |
840 | |
841 | classname = ST(0); | |
e1a479c5 | 842 | |
70cd14a1 CB |
843 | classname_pv = SvPV_nolen(classname); |
844 | classname_len = strlen(classname_pv); | |
dd69841b | 845 | |
73968c7a NC |
846 | he = hv_fetch_ent(PL_isarev, classname, 0, 0); |
847 | isarev = he ? (HV*)HeVAL(he) : NULL; | |
dd69841b | 848 | |
70cd14a1 | 849 | if((classname_len == 9 && strEQ(classname_pv, "UNIVERSAL")) |
dd69841b | 850 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) |
9edc5bb8 RGS |
851 | XSRETURN_YES; |
852 | else | |
853 | XSRETURN_NO; | |
e1a479c5 BB |
854 | } |
855 | ||
c5860d66 | 856 | XS(XS_mro_invalidate_method_caches) |
e1a479c5 BB |
857 | { |
858 | dVAR; | |
859 | dXSARGS; | |
860 | ||
861 | PERL_UNUSED_ARG(cv); | |
862 | ||
863 | if (items != 0) | |
864 | Perl_croak(aTHX_ "Usage: mro::invalidate_all_method_caches()"); | |
865 | ||
866 | PL_sub_generation++; | |
867 | ||
868 | XSRETURN_EMPTY; | |
869 | } | |
870 | ||
e1a479c5 BB |
871 | XS(XS_mro_method_changed_in) |
872 | { | |
873 | dVAR; | |
874 | dXSARGS; | |
875 | SV* classname; | |
876 | HV* class_stash; | |
877 | ||
878 | PERL_UNUSED_ARG(cv); | |
879 | ||
880 | if(items != 1) | |
881 | Perl_croak(aTHX_ "Usage: mro::method_changed_in(classname)"); | |
882 | ||
883 | classname = ST(0); | |
884 | ||
885 | class_stash = gv_stashsv(classname, 0); | |
886 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
887 | ||
888 | mro_method_changed_in(class_stash); | |
889 | ||
890 | XSRETURN_EMPTY; | |
891 | } | |
892 | ||
70cd14a1 CB |
893 | XS(XS_mro_get_pkg_gen) |
894 | { | |
895 | dVAR; | |
896 | dXSARGS; | |
897 | SV* classname; | |
898 | HV* class_stash; | |
899 | ||
900 | PERL_UNUSED_ARG(cv); | |
901 | ||
902 | if(items != 1) | |
903 | Perl_croak(aTHX_ "Usage: mro::get_pkg_gen(classname)"); | |
904 | ||
905 | classname = ST(0); | |
906 | ||
907 | class_stash = gv_stashsv(classname, 0); | |
908 | ||
909 | SP -= items; | |
910 | ||
911 | XPUSHs(sv_2mortal(newSViv( | |
912 | class_stash ? HvMROMETA(class_stash)->pkg_gen : 0 | |
913 | ))); | |
914 | ||
915 | PUTBACK; | |
916 | return; | |
917 | } | |
918 | ||
f58cd386 | 919 | XS(XS_mro_nextcan) |
e1a479c5 BB |
920 | { |
921 | dVAR; | |
922 | dXSARGS; | |
f58cd386 BB |
923 | SV* self = ST(0); |
924 | const I32 throw_nomethod = SvIVX(ST(1)); | |
bbd28cb9 | 925 | register I32 cxix = cxstack_ix; |
f58cd386 BB |
926 | register const PERL_CONTEXT *ccstack = cxstack; |
927 | const PERL_SI *top_si = PL_curstackinfo; | |
928 | HV* selfstash; | |
929 | SV *stashname; | |
930 | const char *fq_subname; | |
931 | const char *subname; | |
932 | STRLEN stashname_len; | |
933 | STRLEN subname_len; | |
934 | SV* sv; | |
935 | GV** gvp; | |
936 | AV* linear_av; | |
937 | SV** linear_svp; | |
938 | const char *hvname; | |
939 | I32 entries; | |
940 | struct mro_meta* selfmeta; | |
941 | HV* nmcache; | |
bbd28cb9 | 942 | I32 i; |
e1a479c5 | 943 | |
48fc4736 JH |
944 | PERL_UNUSED_ARG(cv); |
945 | ||
f58cd386 BB |
946 | SP -= items; |
947 | ||
948 | if(sv_isobject(self)) | |
949 | selfstash = SvSTASH(SvRV(self)); | |
950 | else | |
951 | selfstash = gv_stashsv(self, 0); | |
952 | ||
953 | assert(selfstash); | |
954 | ||
955 | hvname = HvNAME_get(selfstash); | |
956 | if (!hvname) | |
957 | Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); | |
958 | ||
f58cd386 BB |
959 | /* This block finds the contextually-enclosing fully-qualified subname, |
960 | much like looking at (caller($i))[3] until you find a real sub that | |
bbd28cb9 BB |
961 | isn't ANON, etc (also skips over pureperl next::method, etc) */ |
962 | for(i = 0; i < 2; i++) { | |
963 | cxix = __dopoptosub_at(ccstack, cxix); | |
964 | for (;;) { | |
965 | GV* cvgv; | |
966 | STRLEN fq_subname_len; | |
967 | ||
968 | /* we may be in a higher stacklevel, so dig down deeper */ | |
969 | while (cxix < 0) { | |
970 | if(top_si->si_type == PERLSI_MAIN) | |
971 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method must be used in method context"); | |
972 | top_si = top_si->si_prev; | |
973 | ccstack = top_si->si_cxstack; | |
974 | cxix = __dopoptosub_at(ccstack, top_si->si_cxix); | |
975 | } | |
f58cd386 | 976 | |
bbd28cb9 BB |
977 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB |
978 | || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) { | |
979 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
980 | continue; | |
981 | } | |
e1a479c5 | 982 | |
bbd28cb9 BB |
983 | { |
984 | const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1); | |
985 | if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) { | |
986 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) { | |
987 | cxix = dbcxix; | |
988 | continue; | |
989 | } | |
f58cd386 BB |
990 | } |
991 | } | |
f58cd386 | 992 | |
bbd28cb9 | 993 | cvgv = CvGV(ccstack[cxix].blk_sub.cv); |
f58cd386 | 994 | |
bbd28cb9 BB |
995 | if(!isGV(cvgv)) { |
996 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
997 | continue; | |
998 | } | |
f58cd386 | 999 | |
bbd28cb9 BB |
1000 | /* we found a real sub here */ |
1001 | sv = sv_2mortal(newSV(0)); | |
f58cd386 | 1002 | |
bbd28cb9 | 1003 | gv_efullname3(sv, cvgv, NULL); |
f58cd386 | 1004 | |
bbd28cb9 BB |
1005 | fq_subname = SvPVX(sv); |
1006 | fq_subname_len = SvCUR(sv); | |
f58cd386 | 1007 | |
bbd28cb9 BB |
1008 | subname = strrchr(fq_subname, ':'); |
1009 | if(!subname) | |
1010 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method"); | |
f58cd386 | 1011 | |
bbd28cb9 BB |
1012 | subname++; |
1013 | subname_len = fq_subname_len - (subname - fq_subname); | |
1014 | if(subname_len == 8 && strEQ(subname, "__ANON__")) { | |
1015 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
1016 | continue; | |
1017 | } | |
1018 | break; | |
f58cd386 | 1019 | } |
bbd28cb9 | 1020 | cxix--; |
e1a479c5 | 1021 | } |
f58cd386 BB |
1022 | |
1023 | /* If we made it to here, we found our context */ | |
1024 | ||
1025 | /* Initialize the next::method cache for this stash | |
1026 | if necessary */ | |
1027 | selfmeta = HvMROMETA(selfstash); | |
1028 | if(!(nmcache = selfmeta->mro_nextmethod)) { | |
1029 | nmcache = selfmeta->mro_nextmethod = newHV(); | |
1030 | } | |
1031 | else { /* Use the cached coderef if it exists */ | |
1032 | HE* cache_entry = hv_fetch_ent(nmcache, sv, 0, 0); | |
1033 | if (cache_entry) { | |
1034 | SV* const val = HeVAL(cache_entry); | |
1035 | if(val == &PL_sv_undef) { | |
1036 | if(throw_nomethod) | |
1037 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); | |
1038 | XSRETURN_EMPTY; | |
1039 | } | |
1040 | XPUSHs(sv_2mortal(newRV_inc(val))); | |
1041 | XSRETURN(1); | |
1042 | } | |
e1a479c5 BB |
1043 | } |
1044 | ||
f58cd386 | 1045 | /* beyond here is just for cache misses, so perf isn't as critical */ |
e1a479c5 | 1046 | |
f58cd386 BB |
1047 | stashname_len = subname - fq_subname - 2; |
1048 | stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len)); | |
e1a479c5 | 1049 | |
f58cd386 | 1050 | linear_av = mro_get_linear_isa_c3(selfstash, 0); /* has ourselves at the top of the list */ |
e1a479c5 | 1051 | |
f58cd386 BB |
1052 | linear_svp = AvARRAY(linear_av); |
1053 | entries = AvFILLp(linear_av) + 1; | |
e1a479c5 | 1054 | |
f58cd386 BB |
1055 | /* Walk down our MRO, skipping everything up |
1056 | to the contextually enclosing class */ | |
1057 | while (entries--) { | |
1058 | SV * const linear_sv = *linear_svp++; | |
1059 | assert(linear_sv); | |
1060 | if(sv_eq(linear_sv, stashname)) | |
1061 | break; | |
1062 | } | |
e1a479c5 | 1063 | |
f58cd386 BB |
1064 | /* Now search the remainder of the MRO for the |
1065 | same method name as the contextually enclosing | |
1066 | method */ | |
1067 | if(entries > 0) { | |
1068 | while (entries--) { | |
1069 | SV * const linear_sv = *linear_svp++; | |
1070 | HV* curstash; | |
1071 | GV* candidate; | |
1072 | CV* cand_cv; | |
e1a479c5 | 1073 | |
f58cd386 BB |
1074 | assert(linear_sv); |
1075 | curstash = gv_stashsv(linear_sv, FALSE); | |
1076 | ||
1077 | if (!curstash) { | |
1078 | if (ckWARN(WARN_SYNTAX)) | |
1079 | Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA", | |
1080 | (void*)linear_sv, hvname); | |
1081 | continue; | |
1082 | } | |
1083 | ||
1084 | assert(curstash); | |
1085 | ||
1086 | gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0); | |
1087 | if (!gvp) continue; | |
1088 | ||
1089 | candidate = *gvp; | |
1090 | assert(candidate); | |
1091 | ||
1092 | if (SvTYPE(candidate) != SVt_PVGV) | |
1093 | gv_init(candidate, curstash, subname, subname_len, TRUE); | |
1094 | ||
1095 | /* Notably, we only look for real entries, not method cache | |
1096 | entries, because in C3 the method cache of a parent is not | |
1097 | valid for the child */ | |
1098 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { | |
1099 | SvREFCNT_inc_simple_void_NN((SV*)cand_cv); | |
04fe65b0 | 1100 | (void)hv_store_ent(nmcache, newSVsv(sv), (SV*)cand_cv, 0); |
f58cd386 BB |
1101 | XPUSHs(sv_2mortal(newRV_inc((SV*)cand_cv))); |
1102 | XSRETURN(1); | |
1103 | } | |
1104 | } | |
e1a479c5 BB |
1105 | } |
1106 | ||
04fe65b0 | 1107 | (void)hv_store_ent(nmcache, newSVsv(sv), &PL_sv_undef, 0); |
f58cd386 BB |
1108 | if(throw_nomethod) |
1109 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); | |
1110 | XSRETURN_EMPTY; | |
e1a479c5 BB |
1111 | } |
1112 | ||
1113 | /* | |
1114 | * Local variables: | |
1115 | * c-indentation-style: bsd | |
1116 | * c-basic-offset: 4 | |
1117 | * indent-tabs-mode: t | |
1118 | * End: | |
1119 | * | |
1120 | * ex: set ts=8 sts=4 sw=4 noet: | |
1121 | */ |