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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 | /* | |
11 | =head1 MRO Functions | |
12 | ||
13 | These functions are related to the method resolution order of perl classes | |
14 | ||
15 | =cut | |
16 | */ | |
17 | ||
18 | #include "EXTERN.h" | |
19 | #include "perl.h" | |
20 | ||
21 | struct mro_meta* | |
22 | Perl_mro_meta_init(pTHX_ HV* stash) | |
23 | { | |
24 | void* newmeta; | |
25 | ||
26 | assert(stash); | |
27 | assert(HvAUX(stash)); | |
28 | assert(!(HvAUX(stash)->xhv_mro_meta)); | |
29 | Newxz(newmeta, sizeof(struct mro_meta), char); | |
30 | HvAUX(stash)->xhv_mro_meta = (struct mro_meta*)newmeta; | |
31 | ((struct mro_meta*)newmeta)->sub_generation = 1; | |
32 | ||
33 | /* Manually flag UNIVERSAL as being universal. | |
34 | This happens early in perl booting (when universal.c | |
35 | does the newXS calls for UNIVERSAL::*), and infects | |
36 | other packages as they are added to UNIVERSAL's MRO | |
37 | */ | |
38 | if(HvNAMELEN_get(stash) == 9 | |
39 | && strEQ(HEK_KEY(HvAUX(stash)->xhv_name), "UNIVERSAL")) { | |
40 | HvMROMETA(stash)->is_universal = 1; | |
41 | } | |
42 | ||
43 | return newmeta; | |
44 | } | |
45 | ||
46 | #if defined(USE_ITHREADS) | |
47 | ||
48 | /* for sv_dup on new threads */ | |
49 | struct mro_meta* | |
50 | Perl_mro_meta_dup(pTHX_ struct mro_meta* smeta, CLONE_PARAMS* param) | |
51 | { | |
52 | void* newmeta_void; | |
53 | struct mro_meta* newmeta; | |
54 | ||
55 | assert(smeta); | |
56 | ||
57 | Newx(newmeta_void, sizeof(struct mro_meta), char); | |
58 | newmeta = (struct mro_meta*)newmeta_void; | |
59 | ||
60 | newmeta->mro_which = smeta->mro_which; | |
61 | newmeta->sub_generation = smeta->sub_generation; | |
62 | newmeta->is_universal = smeta->is_universal; | |
63 | newmeta->fake = smeta->fake; | |
64 | newmeta->mro_linear_dfs = smeta->mro_linear_dfs | |
65 | ? (AV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_linear_dfs, param)) | |
66 | : 0; | |
67 | newmeta->mro_linear_c3 = smeta->mro_linear_c3 | |
68 | ? (AV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_linear_c3, param)) | |
69 | : 0; | |
70 | newmeta->mro_isarev = smeta->mro_isarev | |
71 | ? (HV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_isarev, param)) | |
72 | : 0; | |
73 | newmeta->mro_nextmethod = smeta->mro_nextmethod | |
74 | ? (HV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_nextmethod, param)) | |
75 | : 0; | |
76 | ||
77 | return newmeta; | |
78 | } | |
79 | ||
80 | #endif /* USE_ITHREADS */ | |
81 | ||
82 | /* | |
83 | =for apidoc mro_get_linear_isa_dfs | |
84 | ||
85 | Returns the Depth-First Search linearization of @ISA | |
86 | the given stash. The return value is a read-only AV*. | |
87 | C<level> should be 0 (it is used internally in this | |
88 | function's recursion). | |
89 | ||
90 | =cut | |
91 | */ | |
92 | AV* | |
93 | Perl_mro_get_linear_isa_dfs(pTHX_ HV *stash, I32 level) | |
94 | { | |
95 | AV* retval; | |
96 | GV** gvp; | |
97 | GV* gv; | |
98 | AV* av; | |
99 | SV** svp; | |
100 | I32 items; | |
101 | AV* subrv; | |
102 | SV** subrv_p; | |
103 | I32 subrv_items; | |
104 | const char* stashname; | |
105 | struct mro_meta* meta; | |
106 | ||
107 | assert(stash); | |
108 | assert(HvAUX(stash)); | |
109 | ||
110 | stashname = HvNAME_get(stash); | |
111 | if (!stashname) | |
112 | Perl_croak(aTHX_ | |
113 | "Can't linearize anonymous symbol table"); | |
114 | ||
115 | if (level > 100) | |
116 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", | |
117 | stashname); | |
118 | ||
119 | meta = HvMROMETA(stash); | |
120 | if((retval = meta->mro_linear_dfs)) { | |
121 | /* return cache if valid */ | |
122 | return retval; | |
123 | } | |
124 | ||
125 | /* not in cache, make a new one */ | |
126 | retval = newAV(); | |
127 | av_push(retval, newSVpv(stashname, 0)); /* add ourselves at the top */ | |
128 | ||
129 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); | |
130 | av = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; | |
131 | ||
132 | if(av) { | |
133 | HV* stored = (HV*)sv_2mortal((SV*)newHV()); | |
134 | svp = AvARRAY(av); | |
135 | items = AvFILLp(av) + 1; | |
136 | while (items--) { | |
137 | SV* const sv = *svp++; | |
138 | HV* const basestash = gv_stashsv(sv, 0); | |
139 | ||
140 | if (!basestash) { | |
141 | if(!hv_exists_ent(stored, sv, 0)) { | |
142 | av_push(retval, newSVsv(sv)); | |
143 | hv_store_ent(stored, sv, &PL_sv_undef, 0); | |
144 | } | |
145 | } | |
146 | else { | |
147 | subrv = mro_get_linear_isa_dfs(basestash, level + 1); | |
148 | subrv_p = AvARRAY(subrv); | |
149 | subrv_items = AvFILLp(subrv) + 1; | |
150 | while(subrv_items--) { | |
151 | SV* subsv = *subrv_p++; | |
152 | if(!hv_exists_ent(stored, subsv, 0)) { | |
153 | av_push(retval, newSVsv(subsv)); | |
154 | hv_store_ent(stored, subsv, &PL_sv_undef, 0); | |
155 | } | |
156 | } | |
157 | } | |
158 | } | |
159 | } | |
160 | ||
161 | SvREADONLY_on(retval); | |
162 | meta->mro_linear_dfs = retval; | |
163 | return retval; | |
164 | } | |
165 | ||
166 | /* | |
167 | =for apidoc mro_get_linear_isa_c3 | |
168 | ||
169 | Returns the C3 linearization of @ISA | |
170 | the given stash. The return value is a read-only AV*. | |
171 | C<level> should be 0 (it is used internally in this | |
172 | function's recursion). | |
173 | ||
174 | =cut | |
175 | */ | |
176 | ||
177 | AV* | |
178 | Perl_mro_get_linear_isa_c3(pTHX_ HV* stash, I32 level) | |
179 | { | |
180 | AV* retval; | |
181 | GV** gvp; | |
182 | GV* gv; | |
183 | AV* isa; | |
184 | const char* stashname; | |
185 | STRLEN stashname_len; | |
186 | struct mro_meta* meta; | |
187 | ||
188 | assert(stash); | |
189 | assert(HvAUX(stash)); | |
190 | ||
191 | stashname = HvNAME_get(stash); | |
192 | stashname_len = HvNAMELEN_get(stash); | |
193 | if (!stashname) | |
194 | Perl_croak(aTHX_ | |
195 | "Can't linearize anonymous symbol table"); | |
196 | ||
197 | if (level > 100) | |
198 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", | |
199 | stashname); | |
200 | ||
201 | meta = HvMROMETA(stash); | |
202 | if((retval = meta->mro_linear_c3)) { | |
203 | /* return cache if valid */ | |
204 | return retval; | |
205 | } | |
206 | ||
207 | /* not in cache, make a new one */ | |
208 | ||
209 | retval = newAV(); | |
210 | av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */ | |
211 | ||
212 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); | |
213 | isa = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; | |
214 | ||
215 | if(isa && AvFILLp(isa) >= 0) { | |
216 | SV** seqs_ptr; | |
217 | I32 seqs_items; | |
218 | HV* tails = (HV*)sv_2mortal((SV*)newHV()); | |
219 | AV* seqs = (AV*)sv_2mortal((SV*)newAV()); | |
220 | I32 items = AvFILLp(isa) + 1; | |
221 | SV** isa_ptr = AvARRAY(isa); | |
222 | while(items--) { | |
223 | AV* isa_lin; | |
224 | SV* isa_item = *isa_ptr++; | |
225 | HV* isa_item_stash = gv_stashsv(isa_item, 0); | |
226 | if(!isa_item_stash) { | |
227 | isa_lin = newAV(); | |
228 | av_push(isa_lin, newSVsv(isa_item)); | |
229 | } | |
230 | else { | |
231 | isa_lin = mro_get_linear_isa_c3(isa_item_stash, level + 1); /* recursion */ | |
232 | } | |
233 | av_push(seqs, (SV*)av_make(AvFILLp(isa_lin)+1, AvARRAY(isa_lin))); | |
234 | } | |
235 | av_push(seqs, (SV*)av_make(AvFILLp(isa)+1, AvARRAY(isa))); | |
236 | ||
237 | seqs_ptr = AvARRAY(seqs); | |
238 | seqs_items = AvFILLp(seqs) + 1; | |
239 | while(seqs_items--) { | |
240 | AV* seq = (AV*)*seqs_ptr++; | |
241 | I32 seq_items = AvFILLp(seq); | |
242 | if(seq_items > 0) { | |
243 | SV** seq_ptr = AvARRAY(seq) + 1; | |
244 | while(seq_items--) { | |
245 | SV* seqitem = *seq_ptr++; | |
246 | HE* he = hv_fetch_ent(tails, seqitem, 0, 0); | |
247 | if(!he) { | |
248 | hv_store_ent(tails, seqitem, newSViv(1), 0); | |
249 | } | |
250 | else { | |
251 | SV* val = HeVAL(he); | |
252 | sv_inc(val); | |
253 | } | |
254 | } | |
255 | } | |
256 | } | |
257 | ||
258 | while(1) { | |
259 | SV* seqhead = NULL; | |
260 | SV* cand = NULL; | |
261 | SV* winner = NULL; | |
262 | SV* val; | |
263 | HE* tail_entry; | |
264 | AV* seq; | |
265 | SV** avptr = AvARRAY(seqs); | |
266 | items = AvFILLp(seqs)+1; | |
267 | while(items--) { | |
268 | SV** svp; | |
269 | seq = (AV*)*avptr++; | |
270 | if(AvFILLp(seq) < 0) continue; | |
271 | svp = av_fetch(seq, 0, 0); | |
272 | seqhead = *svp; | |
273 | if(!winner) { | |
274 | cand = seqhead; | |
275 | if((tail_entry = hv_fetch_ent(tails, cand, 0, 0)) | |
276 | && (val = HeVAL(tail_entry)) | |
277 | && (SvIVx(val) > 0)) | |
278 | continue; | |
279 | winner = newSVsv(cand); | |
280 | av_push(retval, winner); | |
281 | } | |
282 | if(!sv_cmp(seqhead, winner)) { | |
283 | ||
284 | /* this is basically shift(@seq) in void context */ | |
285 | SvREFCNT_dec(*AvARRAY(seq)); | |
286 | *AvARRAY(seq) = &PL_sv_undef; | |
287 | AvARRAY(seq) = AvARRAY(seq) + 1; | |
288 | AvMAX(seq)--; | |
289 | AvFILLp(seq)--; | |
290 | ||
291 | if(AvFILLp(seq) < 0) continue; | |
292 | svp = av_fetch(seq, 0, 0); | |
293 | seqhead = *svp; | |
294 | tail_entry = hv_fetch_ent(tails, seqhead, 0, 0); | |
295 | val = HeVAL(tail_entry); | |
296 | sv_dec(val); | |
297 | } | |
298 | } | |
299 | if(!cand) break; | |
300 | if(!winner) { | |
301 | SvREFCNT_dec(retval); | |
302 | Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': " | |
303 | "merging failed on parent '%"SVf"'", stashname, SVfARG(cand)); | |
304 | } | |
305 | } | |
306 | } | |
307 | ||
308 | SvREADONLY_on(retval); | |
309 | meta->mro_linear_c3 = retval; | |
310 | return retval; | |
311 | } | |
312 | ||
313 | /* | |
314 | =for apidoc mro_get_linear_isa | |
315 | ||
316 | Returns either C<mro_get_linear_isa_c3> or | |
317 | C<mro_get_linear_isa_dfs> for the given stash, | |
318 | dependant upon which MRO is in effect | |
319 | for that stash. The return value is a | |
320 | read-only AV*. | |
321 | ||
322 | =cut | |
323 | */ | |
324 | AV* | |
325 | Perl_mro_get_linear_isa(pTHX_ HV *stash) | |
326 | { | |
327 | struct mro_meta* meta; | |
328 | assert(stash); | |
329 | assert(HvAUX(stash)); | |
330 | ||
331 | meta = HvMROMETA(stash); | |
332 | if(meta->mro_which == MRO_DFS) { | |
333 | return mro_get_linear_isa_dfs(stash, 0); | |
334 | } else if(meta->mro_which == MRO_C3) { | |
335 | return mro_get_linear_isa_c3(stash, 0); | |
336 | } else { | |
337 | Perl_croak(aTHX_ "Internal error: invalid MRO!"); | |
338 | } | |
339 | } | |
340 | ||
341 | /* | |
342 | =for apidoc mro_isa_changed_in | |
343 | ||
344 | Takes the neccesary steps (cache invalidations, mostly) | |
345 | when the @ISA of the given package has changed. Invoked | |
346 | by the C<setisa> magic, should not need to invoke directly. | |
347 | ||
348 | =cut | |
349 | */ | |
350 | void | |
351 | Perl_mro_isa_changed_in(pTHX_ HV* stash) | |
352 | { | |
353 | dVAR; | |
354 | HV* isarev; | |
355 | AV* linear_mro; | |
356 | HE* iter; | |
357 | SV** svp; | |
358 | I32 items; | |
359 | struct mro_meta* meta; | |
360 | char* stashname; | |
361 | ||
362 | stashname = HvNAME_get(stash); | |
363 | ||
364 | /* wipe out the cached linearizations for this stash */ | |
365 | meta = HvMROMETA(stash); | |
366 | SvREFCNT_dec((SV*)meta->mro_linear_dfs); | |
367 | SvREFCNT_dec((SV*)meta->mro_linear_c3); | |
368 | meta->mro_linear_dfs = NULL; | |
369 | meta->mro_linear_c3 = NULL; | |
370 | ||
371 | /* Wipe the global method cache if this package | |
372 | is UNIVERSAL or one of its parents */ | |
373 | if(meta->is_universal) | |
374 | PL_sub_generation++; | |
375 | ||
376 | /* Wipe the local method cache otherwise */ | |
377 | else | |
378 | meta->sub_generation++; | |
379 | ||
380 | /* wipe next::method cache too */ | |
381 | if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod); | |
382 | ||
383 | /* Iterate the isarev (classes that are our children), | |
384 | wiping out their linearization and method caches */ | |
385 | if((isarev = meta->mro_isarev)) { | |
386 | hv_iterinit(isarev); | |
387 | while((iter = hv_iternext(isarev))) { | |
388 | SV* revkey = hv_iterkeysv(iter); | |
389 | HV* revstash = gv_stashsv(revkey, 0); | |
390 | struct mro_meta* revmeta = HvMROMETA(revstash); | |
391 | SvREFCNT_dec((SV*)revmeta->mro_linear_dfs); | |
392 | SvREFCNT_dec((SV*)revmeta->mro_linear_c3); | |
393 | revmeta->mro_linear_dfs = NULL; | |
394 | revmeta->mro_linear_c3 = NULL; | |
395 | if(!meta->is_universal) | |
396 | revmeta->sub_generation++; | |
397 | if(revmeta->mro_nextmethod) | |
398 | hv_clear(revmeta->mro_nextmethod); | |
399 | } | |
400 | } | |
401 | ||
402 | /* we're starting at the 2nd element, skipping ourselves here */ | |
403 | linear_mro = mro_get_linear_isa(stash); | |
404 | svp = AvARRAY(linear_mro) + 1; | |
405 | items = AvFILLp(linear_mro); | |
406 | while (items--) { | |
407 | SV* const sv = *svp++; | |
408 | struct mro_meta* mrometa; | |
409 | HV* mroisarev; | |
410 | ||
411 | HV* mrostash = gv_stashsv(sv, 0); | |
412 | if(!mrostash) { | |
413 | mrostash = gv_stashsv(sv, GV_ADD); | |
414 | /* | |
415 | We created the package on the fly, so | |
416 | that we could store isarev information. | |
417 | This flag lets gv_fetchmeth know about it, | |
418 | so that it can still generate the very useful | |
419 | "Can't locate package Foo for @Bar::ISA" warning. | |
420 | */ | |
421 | HvMROMETA(mrostash)->fake = 1; | |
422 | } | |
423 | ||
424 | mrometa = HvMROMETA(mrostash); | |
425 | mroisarev = mrometa->mro_isarev; | |
426 | ||
427 | /* is_universal is viral */ | |
428 | if(meta->is_universal) | |
429 | mrometa->is_universal = 1; | |
430 | ||
431 | if(!mroisarev) | |
432 | mroisarev = mrometa->mro_isarev = newHV(); | |
433 | ||
434 | if(!hv_exists(mroisarev, stashname, strlen(stashname))) | |
435 | hv_store(mroisarev, stashname, strlen(stashname), &PL_sv_yes, 0); | |
436 | ||
437 | if(isarev) { | |
438 | hv_iterinit(isarev); | |
439 | while((iter = hv_iternext(isarev))) { | |
440 | SV* revkey = hv_iterkeysv(iter); | |
441 | if(!hv_exists_ent(mroisarev, revkey, 0)) | |
442 | hv_store_ent(mroisarev, revkey, &PL_sv_yes, 0); | |
443 | } | |
444 | } | |
445 | } | |
446 | } | |
447 | ||
448 | /* | |
449 | =for apidoc mro_method_changed_in | |
450 | ||
451 | Like C<mro_isa_changed_in>, but invalidates method | |
452 | caching on any child classes of the given stash, so | |
453 | that they might notice the changes in this one. | |
454 | ||
455 | Ideally, all instances of C<PL_sub_generation++> in | |
456 | the perl source should be replaced by calls to this. | |
457 | Some already are, but some are more difficult to | |
458 | replace. | |
459 | ||
460 | Perl has always had problems with method caches | |
461 | getting out of sync when one directly manipulates | |
462 | stashes via things like C<%{Foo::} = %{Bar::}> or | |
463 | C<${Foo::}{bar} = ...> or the equivalent. If | |
464 | you do this in core or XS code, call this afterwards | |
465 | on the destination stash to get things back in sync. | |
466 | ||
467 | If you're doing such a thing from pure perl, use | |
468 | C<mro::method_changed_in(classname)>, which | |
469 | just calls this. | |
470 | ||
471 | =cut | |
472 | */ | |
473 | void | |
474 | Perl_mro_method_changed_in(pTHX_ HV *stash) | |
475 | { | |
476 | struct mro_meta* meta = HvMROMETA(stash); | |
477 | HV* isarev; | |
478 | HE* iter; | |
479 | ||
480 | /* If stash is UNIVERSAL, or one of UNIVERSAL's parents, | |
481 | invalidate all method caches globally */ | |
482 | if(meta->is_universal) { | |
483 | PL_sub_generation++; | |
484 | return; | |
485 | } | |
486 | ||
487 | /* else, invalidate the method caches of all child classes, | |
488 | but not itself */ | |
489 | if((isarev = meta->mro_isarev)) { | |
490 | hv_iterinit(isarev); | |
491 | while((iter = hv_iternext(isarev))) { | |
492 | SV* revkey = hv_iterkeysv(iter); | |
493 | HV* revstash = gv_stashsv(revkey, 0); | |
494 | struct mro_meta* mrometa = HvMROMETA(revstash); | |
495 | mrometa->sub_generation++; | |
496 | if(mrometa->mro_nextmethod) | |
497 | hv_clear(mrometa->mro_nextmethod); | |
498 | } | |
499 | } | |
500 | } | |
501 | ||
502 | /* These two are static helpers for next::method and friends, | |
503 | and re-implement a bunch of the code from pp_caller() in | |
504 | a more efficient manner for this particular usage. | |
505 | */ | |
506 | ||
507 | STATIC I32 | |
508 | __dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) { | |
509 | I32 i; | |
510 | for (i = startingblock; i >= 0; i--) { | |
511 | if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i; | |
512 | } | |
513 | return i; | |
514 | } | |
515 | ||
516 | STATIC SV* | |
517 | __nextcan(pTHX_ SV* self, I32 throw_nomethod) | |
518 | { | |
519 | register I32 cxix; | |
520 | register const PERL_CONTEXT *ccstack = cxstack; | |
521 | const PERL_SI *top_si = PL_curstackinfo; | |
522 | HV* selfstash; | |
523 | GV* cvgv; | |
524 | SV *stashname; | |
525 | const char *fq_subname; | |
526 | const char *subname; | |
527 | STRLEN fq_subname_len; | |
528 | STRLEN stashname_len; | |
529 | STRLEN subname_len; | |
530 | SV* sv; | |
531 | GV** gvp; | |
532 | AV* linear_av; | |
533 | SV** linear_svp; | |
534 | SV* linear_sv; | |
535 | HV* curstash; | |
536 | GV* candidate = NULL; | |
537 | CV* cand_cv = NULL; | |
538 | const char *hvname; | |
539 | I32 items; | |
540 | struct mro_meta* selfmeta; | |
541 | HV* nmcache; | |
542 | HE* cache_entry; | |
543 | ||
544 | if(sv_isobject(self)) | |
545 | selfstash = SvSTASH(SvRV(self)); | |
546 | else | |
547 | selfstash = gv_stashsv(self, 0); | |
548 | ||
549 | assert(selfstash); | |
550 | ||
551 | hvname = HvNAME_get(selfstash); | |
552 | if (!hvname) | |
553 | Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); | |
554 | ||
555 | cxix = __dopoptosub_at(cxstack, cxstack_ix); | |
556 | ||
557 | /* This block finds the contextually-enclosing fully-qualified subname, | |
558 | much like looking at (caller($i))[3] until you find a real sub that | |
559 | isn't ANON, etc */ | |
560 | for (;;) { | |
561 | /* we may be in a higher stacklevel, so dig down deeper */ | |
562 | while (cxix < 0) { | |
563 | if(top_si->si_type == PERLSI_MAIN) | |
564 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method must be used in method context"); | |
565 | top_si = top_si->si_prev; | |
566 | ccstack = top_si->si_cxstack; | |
567 | cxix = __dopoptosub_at(ccstack, top_si->si_cxix); | |
568 | } | |
569 | ||
570 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB | |
571 | || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) { | |
572 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
573 | continue; | |
574 | } | |
575 | ||
576 | { | |
577 | const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1); | |
578 | if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) { | |
579 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) { | |
580 | cxix = dbcxix; | |
581 | continue; | |
582 | } | |
583 | } | |
584 | } | |
585 | ||
586 | cvgv = CvGV(ccstack[cxix].blk_sub.cv); | |
587 | ||
588 | if(!isGV(cvgv)) { | |
589 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
590 | continue; | |
591 | } | |
592 | ||
593 | /* we found a real sub here */ | |
594 | sv = sv_2mortal(newSV(0)); | |
595 | ||
596 | gv_efullname3(sv, cvgv, NULL); | |
597 | ||
598 | fq_subname = SvPVX(sv); | |
599 | fq_subname_len = SvCUR(sv); | |
600 | ||
601 | subname = strrchr(fq_subname, ':'); | |
602 | if(!subname) | |
603 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method"); | |
604 | ||
605 | subname++; | |
606 | subname_len = fq_subname_len - (subname - fq_subname); | |
607 | if(subname_len == 8 && strEQ(subname, "__ANON__")) { | |
608 | cxix = __dopoptosub_at(ccstack, cxix - 1); | |
609 | continue; | |
610 | } | |
611 | break; | |
612 | } | |
613 | ||
614 | /* If we made it to here, we found our context */ | |
615 | ||
616 | selfmeta = HvMROMETA(selfstash); | |
617 | if(!(nmcache = selfmeta->mro_nextmethod)) { | |
618 | nmcache = selfmeta->mro_nextmethod = newHV(); | |
619 | } | |
620 | ||
621 | if((cache_entry = hv_fetch_ent(nmcache, sv, 0, 0))) { | |
622 | SV* val = HeVAL(cache_entry); | |
623 | if(val == &PL_sv_undef) { | |
624 | if(throw_nomethod) | |
625 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); | |
626 | } | |
627 | return val; | |
628 | } | |
629 | ||
630 | /* beyond here is just for cache misses, so perf isn't as critical */ | |
631 | ||
632 | stashname_len = subname - fq_subname - 2; | |
633 | stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len)); | |
634 | ||
635 | linear_av = mro_get_linear_isa_c3(selfstash, 0); /* has ourselves at the top of the list */ | |
636 | ||
637 | linear_svp = AvARRAY(linear_av); | |
638 | items = AvFILLp(linear_av) + 1; | |
639 | ||
640 | while (items--) { | |
641 | linear_sv = *linear_svp++; | |
642 | assert(linear_sv); | |
643 | if(sv_eq(linear_sv, stashname)) | |
644 | break; | |
645 | } | |
646 | ||
647 | if(items > 0) { | |
648 | while (items--) { | |
649 | linear_sv = *linear_svp++; | |
650 | assert(linear_sv); | |
651 | curstash = gv_stashsv(linear_sv, FALSE); | |
652 | ||
653 | if (!curstash || (HvMROMETA(curstash)->fake && !HvFILL(curstash))) { | |
654 | if (ckWARN(WARN_MISC)) | |
655 | Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA", | |
656 | (void*)linear_sv, hvname); | |
657 | continue; | |
658 | } | |
659 | ||
660 | assert(curstash); | |
661 | ||
662 | gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0); | |
663 | if (!gvp) continue; | |
664 | ||
665 | candidate = *gvp; | |
666 | assert(candidate); | |
667 | ||
668 | if (SvTYPE(candidate) != SVt_PVGV) | |
669 | gv_init(candidate, curstash, subname, subname_len, TRUE); | |
670 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { | |
671 | SvREFCNT_inc_simple_void_NN((SV*)cand_cv); | |
672 | hv_store_ent(nmcache, newSVsv(sv), (SV*)cand_cv, 0); | |
673 | return (SV*)cand_cv; | |
674 | } | |
675 | } | |
676 | } | |
677 | ||
678 | hv_store_ent(nmcache, newSVsv(sv), &PL_sv_undef, 0); | |
679 | if(throw_nomethod) | |
680 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); | |
681 | return &PL_sv_undef; | |
682 | } | |
683 | ||
684 | #include "XSUB.h" | |
685 | ||
686 | XS(XS_mro_get_linear_isa); | |
687 | XS(XS_mro_set_mro); | |
688 | XS(XS_mro_get_mro); | |
689 | XS(XS_mro_get_isarev); | |
690 | XS(XS_mro_is_universal); | |
691 | XS(XS_mro_get_global_sub_generation); | |
692 | XS(XS_mro_invalidate_all_method_caches); | |
693 | XS(XS_mro_get_sub_generation); | |
694 | XS(XS_mro_method_changed_in); | |
695 | XS(XS_next_can); | |
696 | XS(XS_next_method); | |
697 | XS(XS_maybe_next_method); | |
698 | ||
699 | void | |
700 | Perl_boot_core_mro(pTHX) | |
701 | { | |
702 | dVAR; | |
703 | static const char file[] = __FILE__; | |
704 | ||
705 | newXSproto("mro::get_linear_isa", XS_mro_get_linear_isa, file, "$;$"); | |
706 | newXSproto("mro::set_mro", XS_mro_set_mro, file, "$$"); | |
707 | newXSproto("mro::get_mro", XS_mro_get_mro, file, "$"); | |
708 | newXSproto("mro::get_isarev", XS_mro_get_isarev, file, "$"); | |
709 | newXSproto("mro::is_universal", XS_mro_is_universal, file, "$"); | |
710 | newXSproto("mro::get_global_sub_generation", XS_mro_get_global_sub_generation, file, ""); | |
711 | newXSproto("mro::invalidate_all_method_caches", XS_mro_invalidate_all_method_caches, file, ""); | |
712 | newXSproto("mro::get_sub_generation", XS_mro_get_sub_generation, file, "$"); | |
713 | newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$"); | |
714 | newXS("next::can", XS_next_can, file); | |
715 | newXS("next::method", XS_next_method, file); | |
716 | newXS("maybe::next::method", XS_maybe_next_method, file); | |
717 | } | |
718 | ||
719 | XS(XS_mro_get_linear_isa) { | |
720 | dVAR; | |
721 | dXSARGS; | |
722 | AV* RETVAL; | |
723 | HV* class_stash; | |
724 | SV* classname; | |
725 | ||
726 | PERL_UNUSED_ARG(cv); | |
727 | ||
728 | if(items < 1 || items > 2) | |
729 | Perl_croak(aTHX_ "Usage: mro::get_linear_isa(classname [, type ])"); | |
730 | ||
731 | classname = ST(0); | |
732 | class_stash = gv_stashsv(classname, 0); | |
733 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
734 | ||
735 | if(items > 1) { | |
736 | char* which = SvPV_nolen(ST(1)); | |
737 | if(strEQ(which, "dfs")) | |
738 | RETVAL = mro_get_linear_isa_dfs(class_stash, 0); | |
739 | else if(strEQ(which, "c3")) | |
740 | RETVAL = mro_get_linear_isa_c3(class_stash, 0); | |
741 | else | |
742 | Perl_croak(aTHX_ "Invalid mro name: '%s'", which); | |
743 | } | |
744 | else { | |
745 | RETVAL = mro_get_linear_isa(class_stash); | |
746 | } | |
747 | ||
748 | ST(0) = newRV_inc((SV*)RETVAL); | |
749 | sv_2mortal(ST(0)); | |
750 | XSRETURN(1); | |
751 | } | |
752 | ||
753 | XS(XS_mro_set_mro) | |
754 | { | |
755 | dVAR; | |
756 | dXSARGS; | |
757 | SV* classname; | |
758 | char* whichstr; | |
759 | mro_alg which; | |
760 | HV* class_stash; | |
761 | struct mro_meta* meta; | |
762 | ||
763 | PERL_UNUSED_ARG(cv); | |
764 | ||
765 | if (items != 2) | |
766 | Perl_croak(aTHX_ "Usage: mro::set_mro(classname, type)"); | |
767 | ||
768 | classname = ST(0); | |
769 | whichstr = SvPV_nolen(ST(1)); | |
770 | class_stash = gv_stashsv(classname, GV_ADD); | |
771 | if(!class_stash) Perl_croak(aTHX_ "Cannot create class: '%"SVf"'!", SVfARG(classname)); | |
772 | meta = HvMROMETA(class_stash); | |
773 | ||
774 | if(strEQ(whichstr, "dfs")) | |
775 | which = MRO_DFS; | |
776 | else if(strEQ(whichstr, "c3")) | |
777 | which = MRO_C3; | |
778 | else | |
779 | Perl_croak(aTHX_ "Invalid mro name: '%s'", whichstr); | |
780 | ||
781 | if(meta->mro_which != which) { | |
782 | meta->mro_which = which; | |
783 | /* Only affects local method cache, not | |
784 | even child classes */ | |
785 | meta->sub_generation++; | |
786 | if(meta->mro_nextmethod) | |
787 | hv_clear(meta->mro_nextmethod); | |
788 | } | |
789 | ||
790 | XSRETURN_EMPTY; | |
791 | } | |
792 | ||
793 | ||
794 | XS(XS_mro_get_mro) | |
795 | { | |
796 | dVAR; | |
797 | dXSARGS; | |
798 | SV* classname; | |
799 | HV* class_stash; | |
800 | struct mro_meta* meta; | |
801 | ||
802 | PERL_UNUSED_ARG(cv); | |
803 | ||
804 | if (items != 1) | |
805 | Perl_croak(aTHX_ "Usage: mro::get_mro(classname)"); | |
806 | ||
807 | classname = ST(0); | |
808 | class_stash = gv_stashsv(classname, 0); | |
809 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
810 | meta = HvMROMETA(class_stash); | |
811 | ||
812 | if(meta->mro_which == MRO_DFS) | |
813 | ST(0) = sv_2mortal(newSVpvn("dfs", 3)); | |
814 | else | |
815 | ST(0) = sv_2mortal(newSVpvn("c3", 2)); | |
816 | ||
817 | XSRETURN(1); | |
818 | } | |
819 | ||
820 | XS(XS_mro_get_isarev) | |
821 | { | |
822 | dVAR; | |
823 | dXSARGS; | |
824 | SV* classname; | |
825 | HV* class_stash; | |
826 | HV* isarev; | |
827 | ||
828 | PERL_UNUSED_ARG(cv); | |
829 | ||
830 | if (items != 1) | |
831 | Perl_croak(aTHX_ "Usage: mro::get_isarev(classname)"); | |
832 | ||
833 | classname = ST(0); | |
834 | ||
835 | class_stash = gv_stashsv(classname, 0); | |
836 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
837 | ||
838 | SP -= items; | |
839 | ||
840 | if((isarev = HvMROMETA(class_stash)->mro_isarev)) { | |
841 | HE* iter; | |
842 | hv_iterinit(isarev); | |
843 | while((iter = hv_iternext(isarev))) | |
844 | XPUSHs(hv_iterkeysv(iter)); | |
845 | } | |
846 | ||
847 | PUTBACK; | |
848 | return; | |
849 | } | |
850 | ||
851 | XS(XS_mro_is_universal) | |
852 | { | |
853 | dVAR; | |
854 | dXSARGS; | |
855 | SV* classname; | |
856 | HV* class_stash; | |
857 | ||
858 | PERL_UNUSED_ARG(cv); | |
859 | ||
860 | if (items != 1) | |
861 | Perl_croak(aTHX_ "Usage: mro::get_mro(classname)"); | |
862 | ||
863 | classname = ST(0); | |
864 | class_stash = gv_stashsv(classname, 0); | |
865 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
866 | ||
867 | HvMROMETA(class_stash)->is_universal | |
868 | ? XSRETURN_YES | |
869 | : XSRETURN_NO; | |
870 | } | |
871 | ||
872 | XS(XS_mro_get_global_sub_generation) | |
873 | { | |
874 | dVAR; | |
875 | dXSARGS; | |
876 | ||
877 | PERL_UNUSED_ARG(cv); | |
878 | ||
879 | if (items != 0) | |
880 | Perl_croak(aTHX_ "Usage: mro::get_global_sub_generation()"); | |
881 | ||
882 | ST(0) = sv_2mortal(newSViv(PL_sub_generation)); | |
883 | XSRETURN(1); | |
884 | } | |
885 | ||
886 | XS(XS_mro_invalidate_all_method_caches) | |
887 | { | |
888 | dVAR; | |
889 | dXSARGS; | |
890 | ||
891 | PERL_UNUSED_ARG(cv); | |
892 | ||
893 | if (items != 0) | |
894 | Perl_croak(aTHX_ "Usage: mro::invalidate_all_method_caches()"); | |
895 | ||
896 | PL_sub_generation++; | |
897 | ||
898 | XSRETURN_EMPTY; | |
899 | } | |
900 | ||
901 | XS(XS_mro_get_sub_generation) | |
902 | { | |
903 | dVAR; | |
904 | dXSARGS; | |
905 | SV* classname; | |
906 | HV* class_stash; | |
907 | ||
908 | PERL_UNUSED_ARG(cv); | |
909 | ||
910 | if(items != 1) | |
911 | Perl_croak(aTHX_ "Usage: mro::get_sub_generation(classname)"); | |
912 | ||
913 | classname = ST(0); | |
914 | class_stash = gv_stashsv(classname, 0); | |
915 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
916 | ||
917 | ST(0) = sv_2mortal(newSViv(HvMROMETA(class_stash)->sub_generation)); | |
918 | XSRETURN(1); | |
919 | } | |
920 | ||
921 | XS(XS_mro_method_changed_in) | |
922 | { | |
923 | dVAR; | |
924 | dXSARGS; | |
925 | SV* classname; | |
926 | HV* class_stash; | |
927 | ||
928 | PERL_UNUSED_ARG(cv); | |
929 | ||
930 | if(items != 1) | |
931 | Perl_croak(aTHX_ "Usage: mro::method_changed_in(classname)"); | |
932 | ||
933 | classname = ST(0); | |
934 | ||
935 | class_stash = gv_stashsv(classname, 0); | |
936 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
937 | ||
938 | mro_method_changed_in(class_stash); | |
939 | ||
940 | XSRETURN_EMPTY; | |
941 | } | |
942 | ||
943 | XS(XS_next_can) | |
944 | { | |
945 | dVAR; | |
946 | dXSARGS; | |
947 | SV* self = ST(0); | |
948 | SV* methcv = __nextcan(aTHX_ self, 0); | |
949 | ||
950 | PERL_UNUSED_ARG(cv); | |
951 | PERL_UNUSED_VAR(items); | |
952 | ||
953 | if(methcv == &PL_sv_undef) { | |
954 | ST(0) = &PL_sv_undef; | |
955 | } | |
956 | else { | |
957 | ST(0) = sv_2mortal(newRV_inc(methcv)); | |
958 | } | |
959 | ||
960 | XSRETURN(1); | |
961 | } | |
962 | ||
963 | XS(XS_next_method) | |
964 | { | |
965 | dMARK; | |
966 | dAX; | |
967 | SV* self = ST(0); | |
968 | SV* methcv = __nextcan(aTHX_ self, 1); | |
969 | ||
970 | PERL_UNUSED_ARG(cv); | |
971 | ||
972 | PL_markstack_ptr++; | |
973 | call_sv(methcv, GIMME_V); | |
974 | } | |
975 | ||
976 | XS(XS_maybe_next_method) | |
977 | { | |
978 | dMARK; | |
979 | dAX; | |
980 | SV* self = ST(0); | |
981 | SV* methcv = __nextcan(aTHX_ self, 0); | |
982 | ||
983 | PERL_UNUSED_ARG(cv); | |
984 | ||
985 | if(methcv == &PL_sv_undef) { | |
986 | ST(0) = &PL_sv_undef; | |
987 | XSRETURN(1); | |
988 | } | |
989 | ||
990 | PL_markstack_ptr++; | |
991 | call_sv(methcv, GIMME_V); | |
992 | } | |
993 | ||
994 | /* | |
995 | * Local variables: | |
996 | * c-indentation-style: bsd | |
997 | * c-basic-offset: 4 | |
998 | * indent-tabs-mode: t | |
999 | * End: | |
1000 | * | |
1001 | * ex: set ts=8 sts=4 sw=4 noet: | |
1002 | */ |