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e1a479c5 |
1 | /* mro.c |
2 | * |
3 | * Copyright (c) 2007 Brandon L Black |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
8 | */ |
9 | |
10 | /* |
cac98860 |
11 | * "Which order shall we go in?" said Frodo. "Eldest first, or quickest first? |
12 | * You'll be last either way, Master Peregrin." |
13 | */ |
14 | |
15 | /* |
e1a479c5 |
16 | =head1 MRO Functions |
17 | |
18 | These functions are related to the method resolution order of perl classes |
19 | |
20 | =cut |
21 | */ |
22 | |
23 | #include "EXTERN.h" |
24 | #include "perl.h" |
25 | |
26 | struct mro_meta* |
27 | Perl_mro_meta_init(pTHX_ HV* stash) |
28 | { |
9fe4aecf |
29 | struct mro_meta* newmeta; |
e1a479c5 |
30 | |
31 | assert(stash); |
32 | assert(HvAUX(stash)); |
33 | assert(!(HvAUX(stash)->xhv_mro_meta)); |
183086be |
34 | Newxz(newmeta, 1, struct mro_meta); |
9fe4aecf |
35 | HvAUX(stash)->xhv_mro_meta = newmeta; |
36 | newmeta->sub_generation = 1; |
e1a479c5 |
37 | |
38 | /* Manually flag UNIVERSAL as being universal. |
39 | This happens early in perl booting (when universal.c |
40 | does the newXS calls for UNIVERSAL::*), and infects |
41 | other packages as they are added to UNIVERSAL's MRO |
42 | */ |
43 | if(HvNAMELEN_get(stash) == 9 |
44 | && strEQ(HEK_KEY(HvAUX(stash)->xhv_name), "UNIVERSAL")) { |
45 | HvMROMETA(stash)->is_universal = 1; |
46 | } |
47 | |
48 | return newmeta; |
49 | } |
50 | |
51 | #if defined(USE_ITHREADS) |
52 | |
53 | /* for sv_dup on new threads */ |
54 | struct mro_meta* |
55 | Perl_mro_meta_dup(pTHX_ struct mro_meta* smeta, CLONE_PARAMS* param) |
56 | { |
e1a479c5 |
57 | struct mro_meta* newmeta; |
58 | |
59 | assert(smeta); |
60 | |
33e12d9d |
61 | Newx(newmeta, 1, struct mro_meta); |
62 | Copy(smeta, newmeta, 1, struct mro_meta); |
63 | |
64 | if (newmeta->mro_linear_dfs) |
65 | newmeta->mro_linear_dfs |
66 | = (AV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_linear_dfs, param)); |
67 | if (newmeta->mro_linear_c3) |
68 | newmeta->mro_linear_c3 |
69 | = (AV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_linear_c3, param)); |
70 | if (newmeta->mro_isarev) |
71 | newmeta->mro_isarev |
72 | = (HV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_isarev, param)); |
73 | if (newmeta->mro_nextmethod) |
74 | newmeta->mro_nextmethod |
75 | = (HV*) SvREFCNT_inc(sv_dup((SV*)newmeta->mro_nextmethod, param)); |
e1a479c5 |
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 | |
1c908217 |
90 | You are responsible for C<SvREFCNT_inc()> on the |
91 | return value if you plan to store it anywhere |
92 | semi-permanently (otherwise it might be deleted |
93 | out from under you the next time the cache is |
94 | invalidated). |
95 | |
e1a479c5 |
96 | =cut |
97 | */ |
98 | AV* |
99 | Perl_mro_get_linear_isa_dfs(pTHX_ HV *stash, I32 level) |
100 | { |
101 | AV* retval; |
102 | GV** gvp; |
103 | GV* gv; |
104 | AV* av; |
e1a479c5 |
105 | const char* stashname; |
106 | struct mro_meta* meta; |
107 | |
108 | assert(stash); |
109 | assert(HvAUX(stash)); |
110 | |
111 | stashname = HvNAME_get(stash); |
112 | if (!stashname) |
113 | Perl_croak(aTHX_ |
114 | "Can't linearize anonymous symbol table"); |
115 | |
116 | if (level > 100) |
117 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
118 | stashname); |
119 | |
120 | meta = HvMROMETA(stash); |
1c908217 |
121 | |
122 | /* return cache if valid */ |
e1a479c5 |
123 | if((retval = meta->mro_linear_dfs)) { |
e1a479c5 |
124 | return retval; |
125 | } |
126 | |
127 | /* not in cache, make a new one */ |
1c908217 |
128 | |
e1a479c5 |
129 | retval = newAV(); |
130 | av_push(retval, newSVpv(stashname, 0)); /* add ourselves at the top */ |
131 | |
1c908217 |
132 | /* fetch our @ISA */ |
e1a479c5 |
133 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); |
134 | av = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; |
135 | |
640da897 |
136 | if(av && AvFILLp(av) >= 0) { |
1c908217 |
137 | |
138 | /* "stored" is used to keep track of all of the classnames |
139 | we have added to the MRO so far, so we can do a quick |
140 | exists check and avoid adding duplicate classnames to |
141 | the MRO as we go. */ |
142 | |
e1a479c5 |
143 | HV* stored = (HV*)sv_2mortal((SV*)newHV()); |
ffd8da72 |
144 | SV **svp = AvARRAY(av); |
145 | I32 items = AvFILLp(av) + 1; |
1c908217 |
146 | |
147 | /* foreach(@ISA) */ |
e1a479c5 |
148 | while (items--) { |
149 | SV* const sv = *svp++; |
150 | HV* const basestash = gv_stashsv(sv, 0); |
ffd8da72 |
151 | SV *const *subrv_p; |
152 | I32 subrv_items; |
e1a479c5 |
153 | |
154 | if (!basestash) { |
1c908217 |
155 | /* if no stash exists for this @ISA member, |
156 | simply add it to the MRO and move on */ |
ffd8da72 |
157 | subrv_p = &sv; |
158 | subrv_items = 1; |
e1a479c5 |
159 | } |
160 | else { |
1c908217 |
161 | /* otherwise, recurse into ourselves for the MRO |
162 | of this @ISA member, and append their MRO to ours */ |
ffd8da72 |
163 | const AV *const subrv |
164 | = mro_get_linear_isa_dfs(basestash, level + 1); |
165 | |
166 | subrv_p = AvARRAY(subrv); |
167 | subrv_items = AvFILLp(subrv) + 1; |
168 | } |
169 | while(subrv_items--) { |
170 | SV *const subsv = *subrv_p++; |
171 | if(!hv_exists_ent(stored, subsv, 0)) { |
ffd8da72 |
172 | hv_store_ent(stored, subsv, &PL_sv_undef, 0); |
25270bc0 |
173 | av_push(retval, newSVsv(subsv)); |
ffd8da72 |
174 | } |
e1a479c5 |
175 | } |
176 | } |
177 | } |
178 | |
1c908217 |
179 | /* we don't want anyone modifying the cache entry but us, |
180 | and we do so by replacing it completely */ |
e1a479c5 |
181 | SvREADONLY_on(retval); |
1c908217 |
182 | |
e1a479c5 |
183 | meta->mro_linear_dfs = retval; |
184 | return retval; |
185 | } |
186 | |
187 | /* |
188 | =for apidoc mro_get_linear_isa_c3 |
189 | |
190 | Returns the C3 linearization of @ISA |
191 | the given stash. The return value is a read-only AV*. |
192 | C<level> should be 0 (it is used internally in this |
193 | function's recursion). |
194 | |
1c908217 |
195 | You are responsible for C<SvREFCNT_inc()> on the |
196 | return value if you plan to store it anywhere |
197 | semi-permanently (otherwise it might be deleted |
198 | out from under you the next time the cache is |
199 | invalidated). |
200 | |
e1a479c5 |
201 | =cut |
202 | */ |
203 | |
204 | AV* |
205 | Perl_mro_get_linear_isa_c3(pTHX_ HV* stash, I32 level) |
206 | { |
207 | AV* retval; |
208 | GV** gvp; |
209 | GV* gv; |
210 | AV* isa; |
211 | const char* stashname; |
212 | STRLEN stashname_len; |
213 | struct mro_meta* meta; |
214 | |
215 | assert(stash); |
216 | assert(HvAUX(stash)); |
217 | |
218 | stashname = HvNAME_get(stash); |
219 | stashname_len = HvNAMELEN_get(stash); |
220 | if (!stashname) |
221 | Perl_croak(aTHX_ |
222 | "Can't linearize anonymous symbol table"); |
223 | |
224 | if (level > 100) |
225 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
226 | stashname); |
227 | |
228 | meta = HvMROMETA(stash); |
1c908217 |
229 | |
230 | /* return cache if valid */ |
e1a479c5 |
231 | if((retval = meta->mro_linear_c3)) { |
e1a479c5 |
232 | return retval; |
233 | } |
234 | |
235 | /* not in cache, make a new one */ |
236 | |
237 | retval = newAV(); |
238 | av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */ |
239 | |
240 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); |
241 | isa = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; |
242 | |
1c908217 |
243 | /* For a better idea how the rest of this works, see the much clearer |
244 | pure perl version in Algorithm::C3 0.01: |
245 | http://search.cpan.org/src/STEVAN/Algorithm-C3-0.01/lib/Algorithm/C3.pm |
246 | (later versions go about it differently than this code for speed reasons) |
247 | */ |
e1a479c5 |
248 | if(isa && AvFILLp(isa) >= 0) { |
249 | SV** seqs_ptr; |
250 | I32 seqs_items; |
251 | HV* tails = (HV*)sv_2mortal((SV*)newHV()); |
252 | AV* seqs = (AV*)sv_2mortal((SV*)newAV()); |
253 | I32 items = AvFILLp(isa) + 1; |
254 | SV** isa_ptr = AvARRAY(isa); |
255 | while(items--) { |
256 | AV* isa_lin; |
257 | SV* isa_item = *isa_ptr++; |
258 | HV* isa_item_stash = gv_stashsv(isa_item, 0); |
259 | if(!isa_item_stash) { |
260 | isa_lin = newAV(); |
261 | av_push(isa_lin, newSVsv(isa_item)); |
262 | } |
263 | else { |
264 | isa_lin = mro_get_linear_isa_c3(isa_item_stash, level + 1); /* recursion */ |
265 | } |
266 | av_push(seqs, (SV*)av_make(AvFILLp(isa_lin)+1, AvARRAY(isa_lin))); |
267 | } |
268 | av_push(seqs, (SV*)av_make(AvFILLp(isa)+1, AvARRAY(isa))); |
269 | |
270 | seqs_ptr = AvARRAY(seqs); |
271 | seqs_items = AvFILLp(seqs) + 1; |
272 | while(seqs_items--) { |
273 | AV* seq = (AV*)*seqs_ptr++; |
274 | I32 seq_items = AvFILLp(seq); |
275 | if(seq_items > 0) { |
276 | SV** seq_ptr = AvARRAY(seq) + 1; |
277 | while(seq_items--) { |
278 | SV* seqitem = *seq_ptr++; |
279 | HE* he = hv_fetch_ent(tails, seqitem, 0, 0); |
280 | if(!he) { |
281 | hv_store_ent(tails, seqitem, newSViv(1), 0); |
282 | } |
283 | else { |
284 | SV* val = HeVAL(he); |
285 | sv_inc(val); |
286 | } |
287 | } |
288 | } |
289 | } |
290 | |
291 | while(1) { |
292 | SV* seqhead = NULL; |
293 | SV* cand = NULL; |
294 | SV* winner = NULL; |
295 | SV* val; |
296 | HE* tail_entry; |
297 | AV* seq; |
298 | SV** avptr = AvARRAY(seqs); |
299 | items = AvFILLp(seqs)+1; |
300 | while(items--) { |
301 | SV** svp; |
302 | seq = (AV*)*avptr++; |
303 | if(AvFILLp(seq) < 0) continue; |
304 | svp = av_fetch(seq, 0, 0); |
305 | seqhead = *svp; |
306 | if(!winner) { |
307 | cand = seqhead; |
308 | if((tail_entry = hv_fetch_ent(tails, cand, 0, 0)) |
309 | && (val = HeVAL(tail_entry)) |
25270bc0 |
310 | && (SvIVX(val) > 0)) |
e1a479c5 |
311 | continue; |
312 | winner = newSVsv(cand); |
313 | av_push(retval, winner); |
314 | } |
315 | if(!sv_cmp(seqhead, winner)) { |
316 | |
317 | /* this is basically shift(@seq) in void context */ |
318 | SvREFCNT_dec(*AvARRAY(seq)); |
319 | *AvARRAY(seq) = &PL_sv_undef; |
320 | AvARRAY(seq) = AvARRAY(seq) + 1; |
321 | AvMAX(seq)--; |
322 | AvFILLp(seq)--; |
323 | |
324 | if(AvFILLp(seq) < 0) continue; |
325 | svp = av_fetch(seq, 0, 0); |
326 | seqhead = *svp; |
327 | tail_entry = hv_fetch_ent(tails, seqhead, 0, 0); |
328 | val = HeVAL(tail_entry); |
329 | sv_dec(val); |
330 | } |
331 | } |
332 | if(!cand) break; |
333 | if(!winner) { |
334 | SvREFCNT_dec(retval); |
335 | Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': " |
336 | "merging failed on parent '%"SVf"'", stashname, SVfARG(cand)); |
337 | } |
338 | } |
339 | } |
340 | |
1c908217 |
341 | /* we don't want anyone modifying the cache entry but us, |
342 | and we do so by replacing it completely */ |
e1a479c5 |
343 | SvREADONLY_on(retval); |
1c908217 |
344 | |
e1a479c5 |
345 | meta->mro_linear_c3 = retval; |
346 | return retval; |
347 | } |
348 | |
349 | /* |
350 | =for apidoc mro_get_linear_isa |
351 | |
352 | Returns either C<mro_get_linear_isa_c3> or |
353 | C<mro_get_linear_isa_dfs> for the given stash, |
354 | dependant upon which MRO is in effect |
355 | for that stash. The return value is a |
356 | read-only AV*. |
357 | |
1c908217 |
358 | You are responsible for C<SvREFCNT_inc()> on the |
359 | return value if you plan to store it anywhere |
360 | semi-permanently (otherwise it might be deleted |
361 | out from under you the next time the cache is |
362 | invalidated). |
363 | |
e1a479c5 |
364 | =cut |
365 | */ |
366 | AV* |
367 | Perl_mro_get_linear_isa(pTHX_ HV *stash) |
368 | { |
369 | struct mro_meta* meta; |
370 | assert(stash); |
371 | assert(HvAUX(stash)); |
372 | |
373 | meta = HvMROMETA(stash); |
374 | if(meta->mro_which == MRO_DFS) { |
375 | return mro_get_linear_isa_dfs(stash, 0); |
376 | } else if(meta->mro_which == MRO_C3) { |
377 | return mro_get_linear_isa_c3(stash, 0); |
378 | } else { |
14f97ce6 |
379 | Perl_croak(aTHX_ "panic: invalid MRO!"); |
e1a479c5 |
380 | } |
381 | } |
382 | |
383 | /* |
384 | =for apidoc mro_isa_changed_in |
385 | |
1c908217 |
386 | Takes the necessary steps (cache invalidations, mostly) |
e1a479c5 |
387 | when the @ISA of the given package has changed. Invoked |
388 | by the C<setisa> magic, should not need to invoke directly. |
389 | |
390 | =cut |
391 | */ |
392 | void |
393 | Perl_mro_isa_changed_in(pTHX_ HV* stash) |
394 | { |
395 | dVAR; |
396 | HV* isarev; |
397 | AV* linear_mro; |
398 | HE* iter; |
399 | SV** svp; |
400 | I32 items; |
401 | struct mro_meta* meta; |
402 | char* stashname; |
403 | |
404 | stashname = HvNAME_get(stash); |
405 | |
406 | /* wipe out the cached linearizations for this stash */ |
407 | meta = HvMROMETA(stash); |
408 | SvREFCNT_dec((SV*)meta->mro_linear_dfs); |
409 | SvREFCNT_dec((SV*)meta->mro_linear_c3); |
410 | meta->mro_linear_dfs = NULL; |
411 | meta->mro_linear_c3 = NULL; |
412 | |
413 | /* Wipe the global method cache if this package |
414 | is UNIVERSAL or one of its parents */ |
415 | if(meta->is_universal) |
416 | PL_sub_generation++; |
417 | |
418 | /* Wipe the local method cache otherwise */ |
419 | else |
420 | meta->sub_generation++; |
421 | |
422 | /* wipe next::method cache too */ |
423 | if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod); |
424 | |
425 | /* Iterate the isarev (classes that are our children), |
426 | wiping out their linearization and method caches */ |
427 | if((isarev = meta->mro_isarev)) { |
428 | hv_iterinit(isarev); |
429 | while((iter = hv_iternext(isarev))) { |
430 | SV* revkey = hv_iterkeysv(iter); |
431 | HV* revstash = gv_stashsv(revkey, 0); |
432 | struct mro_meta* revmeta = HvMROMETA(revstash); |
433 | SvREFCNT_dec((SV*)revmeta->mro_linear_dfs); |
434 | SvREFCNT_dec((SV*)revmeta->mro_linear_c3); |
435 | revmeta->mro_linear_dfs = NULL; |
436 | revmeta->mro_linear_c3 = NULL; |
437 | if(!meta->is_universal) |
438 | revmeta->sub_generation++; |
439 | if(revmeta->mro_nextmethod) |
440 | hv_clear(revmeta->mro_nextmethod); |
441 | } |
442 | } |
443 | |
1c908217 |
444 | /* Now iterate our MRO (parents), and do a few things: |
445 | 1) instantiate with the "fake" flag if they don't exist |
446 | 2) flag them as universal if we are universal |
447 | 3) Add everything from our isarev to their isarev |
448 | */ |
449 | |
450 | /* We're starting at the 2nd element, skipping ourselves here */ |
e1a479c5 |
451 | linear_mro = mro_get_linear_isa(stash); |
452 | svp = AvARRAY(linear_mro) + 1; |
453 | items = AvFILLp(linear_mro); |
1c908217 |
454 | |
e1a479c5 |
455 | while (items--) { |
456 | SV* const sv = *svp++; |
457 | struct mro_meta* mrometa; |
458 | HV* mroisarev; |
459 | |
460 | HV* mrostash = gv_stashsv(sv, 0); |
461 | if(!mrostash) { |
462 | mrostash = gv_stashsv(sv, GV_ADD); |
463 | /* |
464 | We created the package on the fly, so |
465 | that we could store isarev information. |
466 | This flag lets gv_fetchmeth know about it, |
467 | so that it can still generate the very useful |
468 | "Can't locate package Foo for @Bar::ISA" warning. |
469 | */ |
470 | HvMROMETA(mrostash)->fake = 1; |
471 | } |
472 | |
473 | mrometa = HvMROMETA(mrostash); |
474 | mroisarev = mrometa->mro_isarev; |
475 | |
476 | /* is_universal is viral */ |
477 | if(meta->is_universal) |
478 | mrometa->is_universal = 1; |
479 | |
480 | if(!mroisarev) |
481 | mroisarev = mrometa->mro_isarev = newHV(); |
482 | |
25270bc0 |
483 | /* This hash only ever contains PL_sv_yes. Storing it over itself is |
484 | almost as cheap as calling hv_exists, so on aggregate we expect to |
485 | save time by not making two calls to the common HV code for the |
486 | case where it doesn't exist. */ |
487 | |
488 | hv_store(mroisarev, stashname, strlen(stashname), &PL_sv_yes, 0); |
e1a479c5 |
489 | |
490 | if(isarev) { |
491 | hv_iterinit(isarev); |
492 | while((iter = hv_iternext(isarev))) { |
493 | SV* revkey = hv_iterkeysv(iter); |
25270bc0 |
494 | hv_store_ent(mroisarev, revkey, &PL_sv_yes, 0); |
e1a479c5 |
495 | } |
496 | } |
497 | } |
498 | } |
499 | |
500 | /* |
501 | =for apidoc mro_method_changed_in |
502 | |
503 | Like C<mro_isa_changed_in>, but invalidates method |
504 | caching on any child classes of the given stash, so |
505 | that they might notice the changes in this one. |
506 | |
507 | Ideally, all instances of C<PL_sub_generation++> in |
508 | the perl source should be replaced by calls to this. |
509 | Some already are, but some are more difficult to |
510 | replace. |
511 | |
512 | Perl has always had problems with method caches |
513 | getting out of sync when one directly manipulates |
514 | stashes via things like C<%{Foo::} = %{Bar::}> or |
515 | C<${Foo::}{bar} = ...> or the equivalent. If |
516 | you do this in core or XS code, call this afterwards |
517 | on the destination stash to get things back in sync. |
518 | |
519 | If you're doing such a thing from pure perl, use |
520 | C<mro::method_changed_in(classname)>, which |
521 | just calls this. |
522 | |
523 | =cut |
524 | */ |
525 | void |
526 | Perl_mro_method_changed_in(pTHX_ HV *stash) |
527 | { |
528 | struct mro_meta* meta = HvMROMETA(stash); |
529 | HV* isarev; |
530 | HE* iter; |
531 | |
532 | /* If stash is UNIVERSAL, or one of UNIVERSAL's parents, |
533 | invalidate all method caches globally */ |
534 | if(meta->is_universal) { |
535 | PL_sub_generation++; |
536 | return; |
537 | } |
538 | |
539 | /* else, invalidate the method caches of all child classes, |
540 | but not itself */ |
541 | if((isarev = meta->mro_isarev)) { |
542 | hv_iterinit(isarev); |
543 | while((iter = hv_iternext(isarev))) { |
544 | SV* revkey = hv_iterkeysv(iter); |
545 | HV* revstash = gv_stashsv(revkey, 0); |
546 | struct mro_meta* mrometa = HvMROMETA(revstash); |
547 | mrometa->sub_generation++; |
548 | if(mrometa->mro_nextmethod) |
549 | hv_clear(mrometa->mro_nextmethod); |
550 | } |
551 | } |
552 | } |
553 | |
554 | /* These two are static helpers for next::method and friends, |
555 | and re-implement a bunch of the code from pp_caller() in |
556 | a more efficient manner for this particular usage. |
557 | */ |
558 | |
559 | STATIC I32 |
560 | __dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) { |
561 | I32 i; |
562 | for (i = startingblock; i >= 0; i--) { |
563 | if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i; |
564 | } |
565 | return i; |
566 | } |
567 | |
568 | STATIC SV* |
569 | __nextcan(pTHX_ SV* self, I32 throw_nomethod) |
570 | { |
571 | register I32 cxix; |
572 | register const PERL_CONTEXT *ccstack = cxstack; |
573 | const PERL_SI *top_si = PL_curstackinfo; |
574 | HV* selfstash; |
575 | GV* cvgv; |
576 | SV *stashname; |
577 | const char *fq_subname; |
578 | const char *subname; |
579 | STRLEN fq_subname_len; |
580 | STRLEN stashname_len; |
581 | STRLEN subname_len; |
582 | SV* sv; |
583 | GV** gvp; |
584 | AV* linear_av; |
585 | SV** linear_svp; |
586 | SV* linear_sv; |
587 | HV* curstash; |
588 | GV* candidate = NULL; |
589 | CV* cand_cv = NULL; |
590 | const char *hvname; |
591 | I32 items; |
592 | struct mro_meta* selfmeta; |
593 | HV* nmcache; |
594 | HE* cache_entry; |
595 | |
596 | if(sv_isobject(self)) |
597 | selfstash = SvSTASH(SvRV(self)); |
598 | else |
599 | selfstash = gv_stashsv(self, 0); |
600 | |
601 | assert(selfstash); |
602 | |
603 | hvname = HvNAME_get(selfstash); |
604 | if (!hvname) |
605 | Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); |
606 | |
607 | cxix = __dopoptosub_at(cxstack, cxstack_ix); |
608 | |
609 | /* This block finds the contextually-enclosing fully-qualified subname, |
610 | much like looking at (caller($i))[3] until you find a real sub that |
611 | isn't ANON, etc */ |
612 | for (;;) { |
613 | /* we may be in a higher stacklevel, so dig down deeper */ |
614 | while (cxix < 0) { |
615 | if(top_si->si_type == PERLSI_MAIN) |
616 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method must be used in method context"); |
617 | top_si = top_si->si_prev; |
618 | ccstack = top_si->si_cxstack; |
619 | cxix = __dopoptosub_at(ccstack, top_si->si_cxix); |
620 | } |
621 | |
622 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB |
623 | || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) { |
624 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
625 | continue; |
626 | } |
627 | |
628 | { |
629 | const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1); |
630 | if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) { |
631 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) { |
632 | cxix = dbcxix; |
633 | continue; |
634 | } |
635 | } |
636 | } |
637 | |
638 | cvgv = CvGV(ccstack[cxix].blk_sub.cv); |
639 | |
640 | if(!isGV(cvgv)) { |
641 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
642 | continue; |
643 | } |
644 | |
645 | /* we found a real sub here */ |
646 | sv = sv_2mortal(newSV(0)); |
647 | |
648 | gv_efullname3(sv, cvgv, NULL); |
649 | |
650 | fq_subname = SvPVX(sv); |
651 | fq_subname_len = SvCUR(sv); |
652 | |
653 | subname = strrchr(fq_subname, ':'); |
654 | if(!subname) |
655 | Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method"); |
656 | |
657 | subname++; |
658 | subname_len = fq_subname_len - (subname - fq_subname); |
659 | if(subname_len == 8 && strEQ(subname, "__ANON__")) { |
660 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
661 | continue; |
662 | } |
663 | break; |
664 | } |
665 | |
666 | /* If we made it to here, we found our context */ |
667 | |
1c908217 |
668 | /* Initialize the next::method cache for this stash |
669 | if necessary */ |
e1a479c5 |
670 | selfmeta = HvMROMETA(selfstash); |
671 | if(!(nmcache = selfmeta->mro_nextmethod)) { |
672 | nmcache = selfmeta->mro_nextmethod = newHV(); |
673 | } |
674 | |
1c908217 |
675 | /* Use the cached coderef if it exists */ |
640da897 |
676 | else if((cache_entry = hv_fetch_ent(nmcache, sv, 0, 0))) { |
e1a479c5 |
677 | SV* val = HeVAL(cache_entry); |
678 | if(val == &PL_sv_undef) { |
679 | if(throw_nomethod) |
680 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); |
681 | } |
682 | return val; |
683 | } |
684 | |
685 | /* beyond here is just for cache misses, so perf isn't as critical */ |
686 | |
687 | stashname_len = subname - fq_subname - 2; |
688 | stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len)); |
689 | |
690 | linear_av = mro_get_linear_isa_c3(selfstash, 0); /* has ourselves at the top of the list */ |
691 | |
692 | linear_svp = AvARRAY(linear_av); |
693 | items = AvFILLp(linear_av) + 1; |
694 | |
1c908217 |
695 | /* Walk down our MRO, skipping everything up |
696 | to the contextually enclosing class */ |
e1a479c5 |
697 | while (items--) { |
698 | linear_sv = *linear_svp++; |
699 | assert(linear_sv); |
700 | if(sv_eq(linear_sv, stashname)) |
701 | break; |
702 | } |
703 | |
1c908217 |
704 | /* Now search the remainder of the MRO for the |
705 | same method name as the contextually enclosing |
706 | method */ |
e1a479c5 |
707 | if(items > 0) { |
708 | while (items--) { |
709 | linear_sv = *linear_svp++; |
710 | assert(linear_sv); |
711 | curstash = gv_stashsv(linear_sv, FALSE); |
712 | |
713 | if (!curstash || (HvMROMETA(curstash)->fake && !HvFILL(curstash))) { |
b0c482e3 |
714 | if (ckWARN(WARN_SYNTAX)) |
715 | Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA", |
e1a479c5 |
716 | (void*)linear_sv, hvname); |
717 | continue; |
718 | } |
719 | |
720 | assert(curstash); |
721 | |
722 | gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0); |
723 | if (!gvp) continue; |
724 | |
725 | candidate = *gvp; |
726 | assert(candidate); |
727 | |
728 | if (SvTYPE(candidate) != SVt_PVGV) |
729 | gv_init(candidate, curstash, subname, subname_len, TRUE); |
1c908217 |
730 | |
731 | /* Notably, we only look for real entries, not method cache |
732 | entries, because in C3 the method cache of a parent is not |
733 | valid for the child */ |
e1a479c5 |
734 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { |
735 | SvREFCNT_inc_simple_void_NN((SV*)cand_cv); |
736 | hv_store_ent(nmcache, newSVsv(sv), (SV*)cand_cv, 0); |
737 | return (SV*)cand_cv; |
738 | } |
739 | } |
740 | } |
741 | |
742 | hv_store_ent(nmcache, newSVsv(sv), &PL_sv_undef, 0); |
743 | if(throw_nomethod) |
744 | Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname); |
745 | return &PL_sv_undef; |
746 | } |
747 | |
748 | #include "XSUB.h" |
749 | |
750 | XS(XS_mro_get_linear_isa); |
751 | XS(XS_mro_set_mro); |
752 | XS(XS_mro_get_mro); |
753 | XS(XS_mro_get_isarev); |
754 | XS(XS_mro_is_universal); |
755 | XS(XS_mro_get_global_sub_generation); |
756 | XS(XS_mro_invalidate_all_method_caches); |
757 | XS(XS_mro_get_sub_generation); |
758 | XS(XS_mro_method_changed_in); |
759 | XS(XS_next_can); |
760 | XS(XS_next_method); |
761 | XS(XS_maybe_next_method); |
762 | |
763 | void |
764 | Perl_boot_core_mro(pTHX) |
765 | { |
766 | dVAR; |
767 | static const char file[] = __FILE__; |
768 | |
769 | newXSproto("mro::get_linear_isa", XS_mro_get_linear_isa, file, "$;$"); |
770 | newXSproto("mro::set_mro", XS_mro_set_mro, file, "$$"); |
771 | newXSproto("mro::get_mro", XS_mro_get_mro, file, "$"); |
772 | newXSproto("mro::get_isarev", XS_mro_get_isarev, file, "$"); |
773 | newXSproto("mro::is_universal", XS_mro_is_universal, file, "$"); |
774 | newXSproto("mro::get_global_sub_generation", XS_mro_get_global_sub_generation, file, ""); |
775 | newXSproto("mro::invalidate_all_method_caches", XS_mro_invalidate_all_method_caches, file, ""); |
776 | newXSproto("mro::get_sub_generation", XS_mro_get_sub_generation, file, "$"); |
777 | newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$"); |
778 | newXS("next::can", XS_next_can, file); |
779 | newXS("next::method", XS_next_method, file); |
780 | newXS("maybe::next::method", XS_maybe_next_method, file); |
781 | } |
782 | |
783 | XS(XS_mro_get_linear_isa) { |
784 | dVAR; |
785 | dXSARGS; |
786 | AV* RETVAL; |
787 | HV* class_stash; |
788 | SV* classname; |
789 | |
790 | PERL_UNUSED_ARG(cv); |
791 | |
792 | if(items < 1 || items > 2) |
793 | Perl_croak(aTHX_ "Usage: mro::get_linear_isa(classname [, type ])"); |
794 | |
795 | classname = ST(0); |
796 | class_stash = gv_stashsv(classname, 0); |
797 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); |
798 | |
799 | if(items > 1) { |
800 | char* which = SvPV_nolen(ST(1)); |
801 | if(strEQ(which, "dfs")) |
802 | RETVAL = mro_get_linear_isa_dfs(class_stash, 0); |
803 | else if(strEQ(which, "c3")) |
804 | RETVAL = mro_get_linear_isa_c3(class_stash, 0); |
805 | else |
806 | Perl_croak(aTHX_ "Invalid mro name: '%s'", which); |
807 | } |
808 | else { |
809 | RETVAL = mro_get_linear_isa(class_stash); |
810 | } |
811 | |
812 | ST(0) = newRV_inc((SV*)RETVAL); |
813 | sv_2mortal(ST(0)); |
814 | XSRETURN(1); |
815 | } |
816 | |
817 | XS(XS_mro_set_mro) |
818 | { |
819 | dVAR; |
820 | dXSARGS; |
821 | SV* classname; |
822 | char* whichstr; |
823 | mro_alg which; |
824 | HV* class_stash; |
825 | struct mro_meta* meta; |
826 | |
827 | PERL_UNUSED_ARG(cv); |
828 | |
829 | if (items != 2) |
830 | Perl_croak(aTHX_ "Usage: mro::set_mro(classname, type)"); |
831 | |
832 | classname = ST(0); |
833 | whichstr = SvPV_nolen(ST(1)); |
834 | class_stash = gv_stashsv(classname, GV_ADD); |
835 | if(!class_stash) Perl_croak(aTHX_ "Cannot create class: '%"SVf"'!", SVfARG(classname)); |
836 | meta = HvMROMETA(class_stash); |
837 | |
838 | if(strEQ(whichstr, "dfs")) |
839 | which = MRO_DFS; |
840 | else if(strEQ(whichstr, "c3")) |
841 | which = MRO_C3; |
842 | else |
843 | Perl_croak(aTHX_ "Invalid mro name: '%s'", whichstr); |
844 | |
845 | if(meta->mro_which != which) { |
846 | meta->mro_which = which; |
847 | /* Only affects local method cache, not |
848 | even child classes */ |
849 | meta->sub_generation++; |
850 | if(meta->mro_nextmethod) |
851 | hv_clear(meta->mro_nextmethod); |
852 | } |
853 | |
854 | XSRETURN_EMPTY; |
855 | } |
856 | |
857 | |
858 | XS(XS_mro_get_mro) |
859 | { |
860 | dVAR; |
861 | dXSARGS; |
862 | SV* classname; |
863 | HV* class_stash; |
864 | struct mro_meta* meta; |
865 | |
866 | PERL_UNUSED_ARG(cv); |
867 | |
868 | if (items != 1) |
869 | Perl_croak(aTHX_ "Usage: mro::get_mro(classname)"); |
870 | |
871 | classname = ST(0); |
872 | class_stash = gv_stashsv(classname, 0); |
873 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); |
874 | meta = HvMROMETA(class_stash); |
875 | |
876 | if(meta->mro_which == MRO_DFS) |
877 | ST(0) = sv_2mortal(newSVpvn("dfs", 3)); |
878 | else |
879 | ST(0) = sv_2mortal(newSVpvn("c3", 2)); |
880 | |
881 | XSRETURN(1); |
882 | } |
883 | |
884 | XS(XS_mro_get_isarev) |
885 | { |
886 | dVAR; |
887 | dXSARGS; |
888 | SV* classname; |
889 | HV* class_stash; |
890 | HV* isarev; |
891 | |
892 | PERL_UNUSED_ARG(cv); |
893 | |
894 | if (items != 1) |
895 | Perl_croak(aTHX_ "Usage: mro::get_isarev(classname)"); |
896 | |
897 | classname = ST(0); |
898 | |
899 | class_stash = gv_stashsv(classname, 0); |
900 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); |
901 | |
902 | SP -= items; |
903 | |
904 | if((isarev = HvMROMETA(class_stash)->mro_isarev)) { |
905 | HE* iter; |
906 | hv_iterinit(isarev); |
907 | while((iter = hv_iternext(isarev))) |
908 | XPUSHs(hv_iterkeysv(iter)); |
909 | } |
910 | |
911 | PUTBACK; |
912 | return; |
913 | } |
914 | |
915 | XS(XS_mro_is_universal) |
916 | { |
917 | dVAR; |
918 | dXSARGS; |
919 | SV* classname; |
920 | HV* class_stash; |
921 | |
922 | PERL_UNUSED_ARG(cv); |
923 | |
924 | if (items != 1) |
925 | Perl_croak(aTHX_ "Usage: mro::get_mro(classname)"); |
926 | |
927 | classname = ST(0); |
928 | class_stash = gv_stashsv(classname, 0); |
929 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); |
930 | |
9edc5bb8 |
931 | if (HvMROMETA(class_stash)->is_universal) |
932 | XSRETURN_YES; |
933 | else |
934 | XSRETURN_NO; |
e1a479c5 |
935 | } |
936 | |
937 | XS(XS_mro_get_global_sub_generation) |
938 | { |
939 | dVAR; |
940 | dXSARGS; |
941 | |
942 | PERL_UNUSED_ARG(cv); |
943 | |
944 | if (items != 0) |
945 | Perl_croak(aTHX_ "Usage: mro::get_global_sub_generation()"); |
946 | |
947 | ST(0) = sv_2mortal(newSViv(PL_sub_generation)); |
948 | XSRETURN(1); |
949 | } |
950 | |
951 | XS(XS_mro_invalidate_all_method_caches) |
952 | { |
953 | dVAR; |
954 | dXSARGS; |
955 | |
956 | PERL_UNUSED_ARG(cv); |
957 | |
958 | if (items != 0) |
959 | Perl_croak(aTHX_ "Usage: mro::invalidate_all_method_caches()"); |
960 | |
961 | PL_sub_generation++; |
962 | |
963 | XSRETURN_EMPTY; |
964 | } |
965 | |
966 | XS(XS_mro_get_sub_generation) |
967 | { |
968 | dVAR; |
969 | dXSARGS; |
970 | SV* classname; |
971 | HV* class_stash; |
972 | |
973 | PERL_UNUSED_ARG(cv); |
974 | |
975 | if(items != 1) |
976 | Perl_croak(aTHX_ "Usage: mro::get_sub_generation(classname)"); |
977 | |
978 | classname = ST(0); |
979 | class_stash = gv_stashsv(classname, 0); |
980 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); |
981 | |
982 | ST(0) = sv_2mortal(newSViv(HvMROMETA(class_stash)->sub_generation)); |
983 | XSRETURN(1); |
984 | } |
985 | |
986 | XS(XS_mro_method_changed_in) |
987 | { |
988 | dVAR; |
989 | dXSARGS; |
990 | SV* classname; |
991 | HV* class_stash; |
992 | |
993 | PERL_UNUSED_ARG(cv); |
994 | |
995 | if(items != 1) |
996 | Perl_croak(aTHX_ "Usage: mro::method_changed_in(classname)"); |
997 | |
998 | classname = ST(0); |
999 | |
1000 | class_stash = gv_stashsv(classname, 0); |
1001 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); |
1002 | |
1003 | mro_method_changed_in(class_stash); |
1004 | |
1005 | XSRETURN_EMPTY; |
1006 | } |
1007 | |
1008 | XS(XS_next_can) |
1009 | { |
1010 | dVAR; |
1011 | dXSARGS; |
1012 | SV* self = ST(0); |
1013 | SV* methcv = __nextcan(aTHX_ self, 0); |
1014 | |
1015 | PERL_UNUSED_ARG(cv); |
1016 | PERL_UNUSED_VAR(items); |
1017 | |
1018 | if(methcv == &PL_sv_undef) { |
1019 | ST(0) = &PL_sv_undef; |
1020 | } |
1021 | else { |
1022 | ST(0) = sv_2mortal(newRV_inc(methcv)); |
1023 | } |
1024 | |
1025 | XSRETURN(1); |
1026 | } |
1027 | |
1028 | XS(XS_next_method) |
1029 | { |
1030 | dMARK; |
1031 | dAX; |
1032 | SV* self = ST(0); |
1033 | SV* methcv = __nextcan(aTHX_ self, 1); |
1034 | |
1035 | PERL_UNUSED_ARG(cv); |
1036 | |
1037 | PL_markstack_ptr++; |
1038 | call_sv(methcv, GIMME_V); |
1039 | } |
1040 | |
1041 | XS(XS_maybe_next_method) |
1042 | { |
1043 | dMARK; |
1044 | dAX; |
1045 | SV* self = ST(0); |
1046 | SV* methcv = __nextcan(aTHX_ self, 0); |
1047 | |
1048 | PERL_UNUSED_ARG(cv); |
1049 | |
1050 | if(methcv == &PL_sv_undef) { |
1051 | ST(0) = &PL_sv_undef; |
1052 | XSRETURN(1); |
1053 | } |
1054 | |
1055 | PL_markstack_ptr++; |
1056 | call_sv(methcv, GIMME_V); |
1057 | } |
1058 | |
1059 | /* |
1060 | * Local variables: |
1061 | * c-indentation-style: bsd |
1062 | * c-basic-offset: 4 |
1063 | * indent-tabs-mode: t |
1064 | * End: |
1065 | * |
1066 | * ex: set ts=8 sts=4 sw=4 noet: |
1067 | */ |