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e1a479c5 BB |
1 | /* mro.c |
2 | * | |
3 | * Copyright (c) 2007 Brandon L Black | |
1129b882 | 4 | * Copyright (c) 2007, 2008 Larry Wall and others |
e1a479c5 BB |
5 | * |
6 | * You may distribute under the terms of either the GNU General Public | |
7 | * License or the Artistic License, as specified in the README file. | |
8 | * | |
9 | */ | |
10 | ||
11 | /* | |
4ac71550 TC |
12 | * 'Which order shall we go in?' said Frodo. 'Eldest first, or quickest first? |
13 | * You'll be last either way, Master Peregrin.' | |
14 | * | |
15 | * [p.101 of _The Lord of the Rings_, I/iii: "A Conspiracy Unmasked"] | |
cac98860 RGS |
16 | */ |
17 | ||
18 | /* | |
e1a479c5 BB |
19 | =head1 MRO Functions |
20 | ||
21 | These functions are related to the method resolution order of perl classes | |
22 | ||
23 | =cut | |
24 | */ | |
25 | ||
26 | #include "EXTERN.h" | |
4befac30 | 27 | #define PERL_IN_MRO_C |
e1a479c5 BB |
28 | #include "perl.h" |
29 | ||
a3e6e81e NC |
30 | static const struct mro_alg dfs_alg = |
31 | {S_mro_get_linear_isa_dfs, "dfs", 3, 0, 0}; | |
3d76853f | 32 | |
fa60396f NC |
33 | SV * |
34 | Perl_mro_get_private_data(pTHX_ struct mro_meta *const smeta, | |
35 | const struct mro_alg *const which) | |
36 | { | |
37 | SV **data; | |
38 | PERL_ARGS_ASSERT_MRO_GET_PRIVATE_DATA; | |
39 | ||
5844ac76 NC |
40 | data = (SV **)Perl_hv_common(aTHX_ smeta->mro_linear_all, NULL, |
41 | which->name, which->length, which->kflags, | |
42 | HV_FETCH_JUST_SV, NULL, which->hash); | |
fa60396f NC |
43 | if (!data) |
44 | return NULL; | |
45 | ||
46 | /* If we've been asked to look up the private data for the current MRO, then | |
47 | cache it. */ | |
48 | if (smeta->mro_which == which) | |
3a6fa573 | 49 | smeta->mro_linear_current = *data; |
fa60396f NC |
50 | |
51 | return *data; | |
52 | } | |
53 | ||
54 | SV * | |
55 | Perl_mro_set_private_data(pTHX_ struct mro_meta *const smeta, | |
56 | const struct mro_alg *const which, SV *const data) | |
57 | { | |
58 | PERL_ARGS_ASSERT_MRO_SET_PRIVATE_DATA; | |
59 | ||
9953ff72 | 60 | if (!smeta->mro_linear_all) { |
553e831a NC |
61 | if (smeta->mro_which == which) { |
62 | /* If all we need to store is the current MRO's data, then don't use | |
63 | memory on a hash with 1 element - store it direct, and signal | |
64 | this by leaving the would-be-hash NULL. */ | |
3a6fa573 | 65 | smeta->mro_linear_current = data; |
553e831a NC |
66 | return data; |
67 | } else { | |
68 | HV *const hv = newHV(); | |
69 | /* Start with 2 buckets. It's unlikely we'll need more. */ | |
70 | HvMAX(hv) = 1; | |
9953ff72 | 71 | smeta->mro_linear_all = hv; |
553e831a | 72 | |
3a6fa573 | 73 | if (smeta->mro_linear_current) { |
553e831a NC |
74 | /* If we were storing something directly, put it in the hash |
75 | before we lose it. */ | |
76 | Perl_mro_set_private_data(aTHX_ smeta, smeta->mro_which, | |
3a6fa573 | 77 | smeta->mro_linear_current); |
553e831a NC |
78 | } |
79 | } | |
80 | } | |
81 | ||
82 | /* We get here if we're storing more than one linearisation for this stash, | |
83 | or the linearisation we are storing is not that if its current MRO. */ | |
84 | ||
85 | if (smeta->mro_which == which) { | |
86 | /* If we've been asked to store the private data for the current MRO, | |
87 | then cache it. */ | |
3a6fa573 | 88 | smeta->mro_linear_current = data; |
fa60396f NC |
89 | } |
90 | ||
9953ff72 | 91 | if (!Perl_hv_common(aTHX_ smeta->mro_linear_all, NULL, |
fa60396f NC |
92 | which->name, which->length, which->kflags, |
93 | HV_FETCH_ISSTORE, data, which->hash)) { | |
94 | Perl_croak(aTHX_ "panic: hv_store() failed in set_mro_private_data() " | |
95 | "for '%.*s' %d", (int) which->length, which->name, | |
96 | which->kflags); | |
97 | } | |
98 | ||
99 | return data; | |
100 | } | |
101 | ||
a3e6e81e NC |
102 | const struct mro_alg * |
103 | Perl_mro_get_from_name(pTHX_ SV *name) { | |
104 | SV **data; | |
105 | ||
106 | PERL_ARGS_ASSERT_MRO_GET_FROM_NAME; | |
107 | ||
5844ac76 NC |
108 | data = (SV **)Perl_hv_common(aTHX_ PL_registered_mros, name, NULL, 0, 0, |
109 | HV_FETCH_JUST_SV, NULL, 0); | |
a3e6e81e NC |
110 | if (!data) |
111 | return NULL; | |
112 | assert(SvTYPE(*data) == SVt_IV); | |
113 | assert(SvIOK(*data)); | |
114 | return INT2PTR(const struct mro_alg *, SvUVX(*data)); | |
115 | } | |
116 | ||
117 | void | |
118 | Perl_mro_register(pTHX_ const struct mro_alg *mro) { | |
119 | SV *wrapper = newSVuv(PTR2UV(mro)); | |
120 | ||
121 | PERL_ARGS_ASSERT_MRO_REGISTER; | |
122 | ||
123 | ||
124 | if (!Perl_hv_common(aTHX_ PL_registered_mros, NULL, | |
125 | mro->name, mro->length, mro->kflags, | |
126 | HV_FETCH_ISSTORE, wrapper, mro->hash)) { | |
127 | SvREFCNT_dec(wrapper); | |
128 | Perl_croak(aTHX_ "panic: hv_store() failed in mro_register() " | |
129 | "for '%.*s' %d", (int) mro->length, mro->name, mro->kflags); | |
3d76853f | 130 | } |
3d76853f NC |
131 | } |
132 | ||
e1a479c5 BB |
133 | struct mro_meta* |
134 | Perl_mro_meta_init(pTHX_ HV* stash) | |
135 | { | |
9fe4aecf | 136 | struct mro_meta* newmeta; |
e1a479c5 | 137 | |
7918f24d | 138 | PERL_ARGS_ASSERT_MRO_META_INIT; |
e1a479c5 BB |
139 | assert(HvAUX(stash)); |
140 | assert(!(HvAUX(stash)->xhv_mro_meta)); | |
183086be | 141 | Newxz(newmeta, 1, struct mro_meta); |
9fe4aecf | 142 | HvAUX(stash)->xhv_mro_meta = newmeta; |
dd69841b | 143 | newmeta->cache_gen = 1; |
70cd14a1 | 144 | newmeta->pkg_gen = 1; |
a3e6e81e | 145 | newmeta->mro_which = &dfs_alg; |
e1a479c5 BB |
146 | |
147 | return newmeta; | |
148 | } | |
149 | ||
150 | #if defined(USE_ITHREADS) | |
151 | ||
152 | /* for sv_dup on new threads */ | |
153 | struct mro_meta* | |
154 | Perl_mro_meta_dup(pTHX_ struct mro_meta* smeta, CLONE_PARAMS* param) | |
155 | { | |
e1a479c5 BB |
156 | struct mro_meta* newmeta; |
157 | ||
7918f24d | 158 | PERL_ARGS_ASSERT_MRO_META_DUP; |
e1a479c5 | 159 | |
33e12d9d NC |
160 | Newx(newmeta, 1, struct mro_meta); |
161 | Copy(smeta, newmeta, 1, struct mro_meta); | |
162 | ||
9953ff72 NC |
163 | if (newmeta->mro_linear_all) { |
164 | newmeta->mro_linear_all | |
a09252eb | 165 | = MUTABLE_HV(sv_dup_inc((const SV *)newmeta->mro_linear_all, param)); |
553e831a NC |
166 | /* This is just acting as a shortcut pointer, and will be automatically |
167 | updated on the first get. */ | |
3a6fa573 NC |
168 | newmeta->mro_linear_current = NULL; |
169 | } else if (newmeta->mro_linear_current) { | |
553e831a | 170 | /* Only the current MRO is stored, so this owns the data. */ |
3a6fa573 | 171 | newmeta->mro_linear_current |
a09252eb | 172 | = sv_dup_inc((const SV *)newmeta->mro_linear_current, param); |
553e831a NC |
173 | } |
174 | ||
33e12d9d NC |
175 | if (newmeta->mro_nextmethod) |
176 | newmeta->mro_nextmethod | |
a09252eb | 177 | = MUTABLE_HV(sv_dup_inc((const SV *)newmeta->mro_nextmethod, param)); |
a49ba3fc NC |
178 | if (newmeta->isa) |
179 | newmeta->isa | |
a09252eb | 180 | = MUTABLE_HV(sv_dup_inc((const SV *)newmeta->isa, param)); |
e1a479c5 BB |
181 | |
182 | return newmeta; | |
183 | } | |
184 | ||
185 | #endif /* USE_ITHREADS */ | |
186 | ||
187 | /* | |
188 | =for apidoc mro_get_linear_isa_dfs | |
189 | ||
190 | Returns the Depth-First Search 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 RGS |
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 BB |
201 | =cut |
202 | */ | |
4befac30 | 203 | static AV* |
94d1e706 | 204 | S_mro_get_linear_isa_dfs(pTHX_ HV *stash, U32 level) |
e1a479c5 BB |
205 | { |
206 | AV* retval; | |
207 | GV** gvp; | |
208 | GV* gv; | |
209 | AV* av; | |
190d0b22 | 210 | const HEK* stashhek; |
e1a479c5 | 211 | struct mro_meta* meta; |
a49ba3fc | 212 | SV *our_name; |
73519bd0 | 213 | HV *stored = NULL; |
e1a479c5 | 214 | |
7918f24d | 215 | PERL_ARGS_ASSERT_MRO_GET_LINEAR_ISA_DFS; |
e1a479c5 BB |
216 | assert(HvAUX(stash)); |
217 | ||
00169e2c FC |
218 | stashhek |
219 | = HvAUX(stash)->xhv_name && HvENAME_HEK_NN(stash) | |
220 | ? HvENAME_HEK_NN(stash) | |
221 | : HvNAME_HEK(stash); | |
222 | ||
190d0b22 | 223 | if (!stashhek) |
1e05feb3 | 224 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); |
e1a479c5 BB |
225 | |
226 | if (level > 100) | |
227 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", | |
190d0b22 | 228 | HEK_KEY(stashhek)); |
e1a479c5 BB |
229 | |
230 | meta = HvMROMETA(stash); | |
1c908217 RGS |
231 | |
232 | /* return cache if valid */ | |
a3e6e81e | 233 | if((retval = MUTABLE_AV(MRO_GET_PRIVATE_DATA(meta, &dfs_alg)))) { |
e1a479c5 BB |
234 | return retval; |
235 | } | |
236 | ||
237 | /* not in cache, make a new one */ | |
1c908217 | 238 | |
ad64d0ec | 239 | retval = MUTABLE_AV(sv_2mortal(MUTABLE_SV(newAV()))); |
a49ba3fc NC |
240 | /* We use this later in this function, but don't need a reference to it |
241 | beyond the end of this function, so reference count is fine. */ | |
242 | our_name = newSVhek(stashhek); | |
243 | av_push(retval, our_name); /* add ourselves at the top */ | |
e1a479c5 | 244 | |
1c908217 | 245 | /* fetch our @ISA */ |
e1a479c5 BB |
246 | gvp = (GV**)hv_fetchs(stash, "ISA", FALSE); |
247 | av = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL; | |
248 | ||
a49ba3fc NC |
249 | /* "stored" is used to keep track of all of the classnames we have added to |
250 | the MRO so far, so we can do a quick exists check and avoid adding | |
251 | duplicate classnames to the MRO as we go. | |
252 | It's then retained to be re-used as a fast lookup for ->isa(), by adding | |
253 | our own name and "UNIVERSAL" to it. */ | |
254 | ||
a49ba3fc | 255 | if(av && AvFILLp(av) >= 0) { |
1c908217 | 256 | |
ffd8da72 NC |
257 | SV **svp = AvARRAY(av); |
258 | I32 items = AvFILLp(av) + 1; | |
1c908217 RGS |
259 | |
260 | /* foreach(@ISA) */ | |
e1a479c5 BB |
261 | while (items--) { |
262 | SV* const sv = *svp++; | |
263 | HV* const basestash = gv_stashsv(sv, 0); | |
ffd8da72 NC |
264 | SV *const *subrv_p; |
265 | I32 subrv_items; | |
e1a479c5 BB |
266 | |
267 | if (!basestash) { | |
1c908217 RGS |
268 | /* if no stash exists for this @ISA member, |
269 | simply add it to the MRO and move on */ | |
ffd8da72 NC |
270 | subrv_p = &sv; |
271 | subrv_items = 1; | |
e1a479c5 BB |
272 | } |
273 | else { | |
1c908217 | 274 | /* otherwise, recurse into ourselves for the MRO |
b1d0c68a NC |
275 | of this @ISA member, and append their MRO to ours. |
276 | The recursive call could throw an exception, which | |
277 | has memory management implications here, hence the use of | |
278 | the mortal. */ | |
ffd8da72 NC |
279 | const AV *const subrv |
280 | = mro_get_linear_isa_dfs(basestash, level + 1); | |
281 | ||
282 | subrv_p = AvARRAY(subrv); | |
283 | subrv_items = AvFILLp(subrv) + 1; | |
284 | } | |
73519bd0 NC |
285 | if (stored) { |
286 | while(subrv_items--) { | |
287 | SV *const subsv = *subrv_p++; | |
288 | /* LVALUE fetch will create a new undefined SV if necessary | |
289 | */ | |
290 | HE *const he = hv_fetch_ent(stored, subsv, 1, 0); | |
291 | assert(he); | |
292 | if(HeVAL(he) != &PL_sv_undef) { | |
293 | /* It was newly created. Steal it for our new SV, and | |
294 | replace it in the hash with the "real" thing. */ | |
295 | SV *const val = HeVAL(he); | |
296 | HEK *const key = HeKEY_hek(he); | |
297 | ||
298 | HeVAL(he) = &PL_sv_undef; | |
299 | /* Save copying by making a shared hash key scalar. We | |
300 | inline this here rather than calling | |
301 | Perl_newSVpvn_share because we already have the | |
302 | scalar, and we already have the hash key. */ | |
303 | assert(SvTYPE(val) == SVt_NULL); | |
304 | sv_upgrade(val, SVt_PV); | |
305 | SvPV_set(val, HEK_KEY(share_hek_hek(key))); | |
306 | SvCUR_set(val, HEK_LEN(key)); | |
307 | SvREADONLY_on(val); | |
308 | SvFAKE_on(val); | |
309 | SvPOK_on(val); | |
310 | if (HEK_UTF8(key)) | |
311 | SvUTF8_on(val); | |
312 | ||
313 | av_push(retval, val); | |
314 | } | |
ffd8da72 | 315 | } |
73519bd0 NC |
316 | } else { |
317 | /* We are the first (or only) parent. We can short cut the | |
318 | complexity above, because our @ISA is simply us prepended | |
319 | to our parent's @ISA, and our ->isa cache is simply our | |
320 | parent's, with our name added. */ | |
321 | /* newSVsv() is slow. This code is only faster if we can avoid | |
322 | it by ensuring that SVs in the arrays are shared hash key | |
323 | scalar SVs, because we can "copy" them very efficiently. | |
324 | Although to be fair, we can't *ensure* this, as a reference | |
325 | to the internal array is returned by mro::get_linear_isa(), | |
326 | so we'll have to be defensive just in case someone faffed | |
327 | with it. */ | |
328 | if (basestash) { | |
329 | SV **svp; | |
17eef65c | 330 | stored = MUTABLE_HV(sv_2mortal((SV*)newHVhv(HvMROMETA(basestash)->isa))); |
73519bd0 NC |
331 | av_extend(retval, subrv_items); |
332 | AvFILLp(retval) = subrv_items; | |
333 | svp = AvARRAY(retval); | |
334 | while(subrv_items--) { | |
335 | SV *const val = *subrv_p++; | |
336 | *++svp = SvIsCOW_shared_hash(val) | |
337 | ? newSVhek(SvSHARED_HEK_FROM_PV(SvPVX(val))) | |
338 | : newSVsv(val); | |
339 | } | |
340 | } else { | |
341 | /* They have no stash. So create ourselves an ->isa cache | |
342 | as if we'd copied it from what theirs should be. */ | |
343 | stored = MUTABLE_HV(sv_2mortal(MUTABLE_SV(newHV()))); | |
344 | (void) hv_store(stored, "UNIVERSAL", 9, &PL_sv_undef, 0); | |
345 | av_push(retval, | |
346 | newSVhek(HeKEY_hek(hv_store_ent(stored, sv, | |
347 | &PL_sv_undef, 0)))); | |
348 | } | |
349 | } | |
e1a479c5 | 350 | } |
73519bd0 NC |
351 | } else { |
352 | /* We have no parents. */ | |
353 | stored = MUTABLE_HV(sv_2mortal(MUTABLE_SV(newHV()))); | |
354 | (void) hv_store(stored, "UNIVERSAL", 9, &PL_sv_undef, 0); | |
e1a479c5 BB |
355 | } |
356 | ||
ed09b296 | 357 | (void) hv_store_ent(stored, our_name, &PL_sv_undef, 0); |
ed09b296 NC |
358 | |
359 | SvREFCNT_inc_simple_void_NN(stored); | |
360 | SvTEMP_off(stored); | |
361 | SvREADONLY_on(stored); | |
362 | ||
363 | meta->isa = stored; | |
364 | ||
0fd7ece8 NC |
365 | /* now that we're past the exception dangers, grab our own reference to |
366 | the AV we're about to use for the result. The reference owned by the | |
367 | mortals' stack will be released soon, so everything will balance. */ | |
368 | SvREFCNT_inc_simple_void_NN(retval); | |
369 | SvTEMP_off(retval); | |
fdef73f9 | 370 | |
1c908217 RGS |
371 | /* we don't want anyone modifying the cache entry but us, |
372 | and we do so by replacing it completely */ | |
e1a479c5 | 373 | SvREADONLY_on(retval); |
1c908217 | 374 | |
a3e6e81e | 375 | return MUTABLE_AV(Perl_mro_set_private_data(aTHX_ meta, &dfs_alg, |
fa60396f | 376 | MUTABLE_SV(retval))); |
e1a479c5 BB |
377 | } |
378 | ||
379 | /* | |
e1a479c5 BB |
380 | =for apidoc mro_get_linear_isa |
381 | ||
382 | Returns either C<mro_get_linear_isa_c3> or | |
383 | C<mro_get_linear_isa_dfs> for the given stash, | |
384 | dependant upon which MRO is in effect | |
385 | for that stash. The return value is a | |
386 | read-only AV*. | |
387 | ||
1c908217 RGS |
388 | You are responsible for C<SvREFCNT_inc()> on the |
389 | return value if you plan to store it anywhere | |
390 | semi-permanently (otherwise it might be deleted | |
391 | out from under you the next time the cache is | |
392 | invalidated). | |
393 | ||
e1a479c5 BB |
394 | =cut |
395 | */ | |
396 | AV* | |
397 | Perl_mro_get_linear_isa(pTHX_ HV *stash) | |
398 | { | |
399 | struct mro_meta* meta; | |
7311f41d | 400 | AV *isa; |
2c7f4b87 | 401 | |
7918f24d | 402 | PERL_ARGS_ASSERT_MRO_GET_LINEAR_ISA; |
2c7f4b87 BB |
403 | if(!SvOOK(stash)) |
404 | Perl_croak(aTHX_ "Can't linearize anonymous symbol table"); | |
e1a479c5 BB |
405 | |
406 | meta = HvMROMETA(stash); | |
3d76853f | 407 | if (!meta->mro_which) |
14f97ce6 | 408 | Perl_croak(aTHX_ "panic: invalid MRO!"); |
7311f41d FC |
409 | isa = meta->mro_which->resolve(aTHX_ stash, 0); |
410 | ||
411 | if (!meta->isa) { | |
412 | HV *const isa_hash = newHV(); | |
413 | /* Linearisation didn't build it for us, so do it here. */ | |
414 | SV *const *svp = AvARRAY(isa); | |
415 | SV *const *const svp_end = svp + AvFILLp(isa) + 1; | |
416 | const HEK *canon_name = HvENAME_HEK(stash); | |
417 | if (!canon_name) canon_name = HvNAME_HEK(stash); | |
418 | ||
419 | while (svp < svp_end) { | |
420 | (void) hv_store_ent(isa_hash, *svp++, &PL_sv_undef, 0); | |
421 | } | |
422 | ||
423 | (void) hv_common(isa_hash, NULL, HEK_KEY(canon_name), | |
424 | HEK_LEN(canon_name), HEK_FLAGS(canon_name), | |
425 | HV_FETCH_ISSTORE, &PL_sv_undef, | |
426 | HEK_HASH(canon_name)); | |
427 | (void) hv_store(isa_hash, "UNIVERSAL", 9, &PL_sv_undef, 0); | |
428 | ||
429 | SvREADONLY_on(isa_hash); | |
430 | ||
431 | meta->isa = isa_hash; | |
432 | } | |
433 | ||
434 | return isa; | |
e1a479c5 BB |
435 | } |
436 | ||
437 | /* | |
438 | =for apidoc mro_isa_changed_in | |
439 | ||
1c908217 | 440 | Takes the necessary steps (cache invalidations, mostly) |
e1a479c5 BB |
441 | when the @ISA of the given package has changed. Invoked |
442 | by the C<setisa> magic, should not need to invoke directly. | |
443 | ||
444 | =cut | |
445 | */ | |
f7afb547 | 446 | |
beeda143 | 447 | /* Macro to avoid repeating the code five times. */ |
f7afb547 FC |
448 | #define CLEAR_LINEAR(mEta) \ |
449 | if (mEta->mro_linear_all) { \ | |
450 | SvREFCNT_dec(MUTABLE_SV(mEta->mro_linear_all)); \ | |
451 | mEta->mro_linear_all = NULL; \ | |
452 | /* This is just acting as a shortcut pointer. */ \ | |
453 | mEta->mro_linear_current = NULL; \ | |
454 | } else if (mEta->mro_linear_current) { \ | |
455 | /* Only the current MRO is stored, so this owns the data. */ \ | |
456 | SvREFCNT_dec(mEta->mro_linear_current); \ | |
457 | mEta->mro_linear_current = NULL; \ | |
458 | } | |
459 | ||
e1a479c5 | 460 | void |
4df35a07 | 461 | Perl_mro_isa_changed_in(pTHX_ HV* stash) |
e1a479c5 BB |
462 | { |
463 | dVAR; | |
464 | HV* isarev; | |
465 | AV* linear_mro; | |
466 | HE* iter; | |
467 | SV** svp; | |
468 | I32 items; | |
1e05feb3 | 469 | bool is_universal; |
4df35a07 | 470 | struct mro_meta * meta; |
80ebaca2 | 471 | HV *isa = NULL; |
e1a479c5 | 472 | |
4df35a07 FC |
473 | const char * const stashname = HvENAME_get(stash); |
474 | const STRLEN stashname_len = HvENAMELEN_get(stash); | |
475 | ||
476 | PERL_ARGS_ASSERT_MRO_ISA_CHANGED_IN; | |
7918f24d | 477 | |
2c7f4b87 BB |
478 | if(!stashname) |
479 | Perl_croak(aTHX_ "Can't call mro_isa_changed_in() on anonymous symbol table"); | |
480 | ||
4df35a07 FC |
481 | |
482 | /* wipe out the cached linearizations for this stash */ | |
483 | meta = HvMROMETA(stash); | |
f7afb547 | 484 | CLEAR_LINEAR(meta); |
4df35a07 | 485 | if (meta->isa) { |
80ebaca2 FC |
486 | /* Steal it for our own purposes. */ |
487 | isa = (HV *)sv_2mortal((SV *)meta->isa); | |
5782d502 | 488 | meta->isa = NULL; |
6f86b615 | 489 | } |
70cd14a1 | 490 | |
4df35a07 FC |
491 | /* Inc the package generation, since our @ISA changed */ |
492 | meta->pkg_gen++; | |
493 | ||
e1a479c5 BB |
494 | /* Wipe the global method cache if this package |
495 | is UNIVERSAL or one of its parents */ | |
dd69841b BB |
496 | |
497 | svp = hv_fetch(PL_isarev, stashname, stashname_len, 0); | |
85fbaab2 | 498 | isarev = svp ? MUTABLE_HV(*svp) : NULL; |
dd69841b BB |
499 | |
500 | if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL")) | |
501 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) { | |
e1a479c5 | 502 | PL_sub_generation++; |
dd69841b BB |
503 | is_universal = TRUE; |
504 | } | |
1e05feb3 | 505 | else { /* Wipe the local method cache otherwise */ |
4df35a07 | 506 | meta->cache_gen++; |
1e05feb3 AL |
507 | is_universal = FALSE; |
508 | } | |
e1a479c5 BB |
509 | |
510 | /* wipe next::method cache too */ | |
4df35a07 | 511 | if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod); |
1e05feb3 | 512 | |
e1a479c5 | 513 | /* Iterate the isarev (classes that are our children), |
80ebaca2 FC |
514 | wiping out their linearization, method and isa caches |
515 | and upating PL_isarev. */ | |
dd69841b | 516 | if(isarev) { |
80ebaca2 FC |
517 | HV *isa_hashes = NULL; |
518 | ||
519 | /* We have to iterate through isarev twice to avoid a chicken and | |
520 | * egg problem: if A inherits from B and both are in isarev, A might | |
521 | * be processed before B and use B’s previous linearisation. | |
522 | */ | |
523 | ||
524 | /* First iteration: Wipe everything, but stash away the isa hashes | |
525 | * since we still need them for updating PL_isarev. | |
526 | */ | |
527 | ||
528 | if(hv_iterinit(isarev)) { | |
529 | /* Only create the hash if we need it; i.e., if isarev has | |
530 | any elements. */ | |
531 | isa_hashes = (HV *)sv_2mortal((SV *)newHV()); | |
532 | } | |
e1a479c5 | 533 | while((iter = hv_iternext(isarev))) { |
ec49eb61 NC |
534 | I32 len; |
535 | const char* const revkey = hv_iterkey(iter, &len); | |
536 | HV* revstash = gv_stashpvn(revkey, len, 0); | |
bc2cbbac BB |
537 | struct mro_meta* revmeta; |
538 | ||
539 | if(!revstash) continue; | |
540 | revmeta = HvMROMETA(revstash); | |
f7afb547 | 541 | CLEAR_LINEAR(revmeta); |
dd69841b BB |
542 | if(!is_universal) |
543 | revmeta->cache_gen++; | |
e1a479c5 BB |
544 | if(revmeta->mro_nextmethod) |
545 | hv_clear(revmeta->mro_nextmethod); | |
80ebaca2 FC |
546 | |
547 | (void) | |
548 | hv_store( | |
549 | isa_hashes, (const char*)&revstash, sizeof(HV *), | |
550 | revmeta->isa ? (SV *)revmeta->isa : &PL_sv_undef, 0 | |
551 | ); | |
552 | revmeta->isa = NULL; | |
553 | } | |
554 | ||
555 | /* Second pass: Update PL_isarev. We can just use isa_hashes to | |
556 | * avoid another round of stash lookups. */ | |
557 | ||
558 | /* isarev might be deleted from PL_isarev during this loop, so hang | |
559 | * on to it. */ | |
560 | SvREFCNT_inc_simple_void_NN(sv_2mortal((SV *)isarev)); | |
561 | ||
562 | if(isa_hashes) { | |
563 | hv_iterinit(isa_hashes); | |
564 | while((iter = hv_iternext(isa_hashes))) { | |
565 | HV* const revstash = *(HV **)HEK_KEY(HeKEY_hek(iter)); | |
566 | HV * const isa = (HV *)HeVAL(iter); | |
567 | const HEK *namehek; | |
568 | ||
80ebaca2 FC |
569 | /* We're starting at the 2nd element, skipping revstash */ |
570 | linear_mro = mro_get_linear_isa(revstash); | |
571 | svp = AvARRAY(linear_mro) + 1; | |
572 | items = AvFILLp(linear_mro); | |
573 | ||
574 | namehek = HvENAME_HEK(revstash); | |
575 | if (!namehek) namehek = HvNAME_HEK(revstash); | |
576 | ||
577 | while (items--) { | |
578 | SV* const sv = *svp++; | |
579 | HV* mroisarev; | |
580 | ||
581 | HE *he = hv_fetch_ent(PL_isarev, sv, TRUE, 0); | |
582 | ||
583 | /* That fetch should not fail. But if it had to create | |
584 | a new SV for us, then will need to upgrade it to an | |
585 | HV (which sv_upgrade() can now do for us). */ | |
586 | ||
587 | mroisarev = MUTABLE_HV(HeVAL(he)); | |
588 | ||
589 | SvUPGRADE(MUTABLE_SV(mroisarev), SVt_PVHV); | |
590 | ||
591 | /* This hash only ever contains PL_sv_yes. Storing it | |
592 | over itself is almost as cheap as calling hv_exists, | |
593 | so on aggregate we expect to save time by not making | |
594 | two calls to the common HV code for the case where | |
595 | it doesn't exist. */ | |
596 | ||
597 | (void) | |
598 | hv_store( | |
599 | mroisarev, HEK_KEY(namehek), HEK_LEN(namehek), | |
600 | &PL_sv_yes, 0 | |
601 | ); | |
602 | } | |
603 | ||
604 | if((SV *)isa != &PL_sv_undef) | |
605 | mro_clean_isarev( | |
606 | isa, HEK_KEY(namehek), HEK_LEN(namehek), | |
607 | HvMROMETA(revstash)->isa | |
608 | ); | |
609 | } | |
e1a479c5 BB |
610 | } |
611 | } | |
612 | ||
c9143745 FC |
613 | /* Now iterate our MRO (parents), adding ourselves and everything from |
614 | our isarev to their isarev. | |
1c908217 RGS |
615 | */ |
616 | ||
617 | /* We're starting at the 2nd element, skipping ourselves here */ | |
e1a479c5 BB |
618 | linear_mro = mro_get_linear_isa(stash); |
619 | svp = AvARRAY(linear_mro) + 1; | |
620 | items = AvFILLp(linear_mro); | |
1c908217 | 621 | |
e1a479c5 BB |
622 | while (items--) { |
623 | SV* const sv = *svp++; | |
e1a479c5 BB |
624 | HV* mroisarev; |
625 | ||
117b69ca NC |
626 | HE *he = hv_fetch_ent(PL_isarev, sv, TRUE, 0); |
627 | ||
628 | /* That fetch should not fail. But if it had to create a new SV for | |
4ea50411 NC |
629 | us, then will need to upgrade it to an HV (which sv_upgrade() can |
630 | now do for us. */ | |
117b69ca | 631 | |
85fbaab2 | 632 | mroisarev = MUTABLE_HV(HeVAL(he)); |
e1a479c5 | 633 | |
ad64d0ec | 634 | SvUPGRADE(MUTABLE_SV(mroisarev), SVt_PVHV); |
117b69ca | 635 | |
25270bc0 NC |
636 | /* This hash only ever contains PL_sv_yes. Storing it over itself is |
637 | almost as cheap as calling hv_exists, so on aggregate we expect to | |
638 | save time by not making two calls to the common HV code for the | |
639 | case where it doesn't exist. */ | |
640 | ||
04fe65b0 | 641 | (void)hv_store(mroisarev, stashname, stashname_len, &PL_sv_yes, 0); |
80ebaca2 FC |
642 | } |
643 | ||
80ebaca2 FC |
644 | /* Delete our name from our former parents’ isarevs. */ |
645 | if(isa && HvARRAY(isa)) | |
646 | mro_clean_isarev(isa, stashname, stashname_len, meta->isa); | |
647 | } | |
648 | ||
649 | /* Deletes name from all the isarev entries listed in isa */ | |
650 | STATIC void | |
651 | S_mro_clean_isarev(pTHX_ HV * const isa, const char * const name, | |
652 | const STRLEN len, HV * const exceptions) | |
653 | { | |
654 | HE* iter; | |
e1a479c5 | 655 | |
80ebaca2 FC |
656 | PERL_ARGS_ASSERT_MRO_CLEAN_ISAREV; |
657 | ||
658 | /* Delete our name from our former parents’ isarevs. */ | |
659 | if(isa && HvARRAY(isa) && hv_iterinit(isa)) { | |
660 | SV **svp; | |
661 | while((iter = hv_iternext(isa))) { | |
662 | I32 klen; | |
663 | const char * const key = hv_iterkey(iter, &klen); | |
664 | if(exceptions && hv_exists(exceptions, key, klen)) continue; | |
665 | svp = hv_fetch(PL_isarev, key, klen, 0); | |
666 | if(svp) { | |
667 | HV * const isarev = (HV *)*svp; | |
668 | (void)hv_delete(isarev, name, len, G_DISCARD); | |
669 | if(!HvARRAY(isarev) || !HvKEYS(isarev)) | |
670 | (void)hv_delete(PL_isarev, key, klen, G_DISCARD); | |
e1a479c5 BB |
671 | } |
672 | } | |
673 | } | |
674 | } | |
675 | ||
676 | /* | |
c8bbf675 FC |
677 | =for apidoc mro_package_moved |
678 | ||
d056e33c FC |
679 | Call this function to signal to a stash that it has been assigned to |
680 | another spot in the stash hierarchy. C<stash> is the stash that has been | |
681 | assigned. C<oldstash> is the stash it replaces, if any. C<gv> is the glob | |
682 | that is actually being assigned to. C<newname> and C<newname_len> are the | |
683 | full name of the GV. If these last two arguments are omitted, they can be | |
35759254 | 684 | inferred from C<gv>. C<gv> can be omitted if C<newname> is given. |
d056e33c | 685 | |
35759254 | 686 | This can also be called with a null first argument to |
d056e33c FC |
687 | indicate that C<oldstash> has been deleted. |
688 | ||
689 | This function invalidates isa caches on the old stash, on all subpackages | |
690 | nested inside it, and on the subclasses of all those, including | |
691 | non-existent packages that have corresponding entries in C<stash>. | |
c8bbf675 | 692 | |
80ebaca2 FC |
693 | It also sets the effective names (C<HvENAME>) on all the stashes as |
694 | appropriate. | |
695 | ||
c8bbf675 FC |
696 | =cut |
697 | */ | |
698 | void | |
35759254 FC |
699 | Perl_mro_package_moved(pTHX_ HV * const stash, HV * const oldstash, |
700 | const GV *gv, const char *newname, | |
62c1e33f | 701 | I32 newname_len) |
c8bbf675 | 702 | { |
80ebaca2 FC |
703 | HV *stashes; |
704 | HE* iter; | |
62c1e33f | 705 | |
35759254 | 706 | assert(stash || oldstash); |
80ebaca2 | 707 | assert(gv || newname); |
35759254 FC |
708 | |
709 | /* Determine the name of the location that stash was assigned to | |
710 | * or from which oldstash was removed. | |
711 | * | |
928eb066 | 712 | * We cannot reliably use the name in oldstash, because it may have |
35759254 FC |
713 | * been deleted from the location in the symbol table that its name |
714 | * suggests, as in this case: | |
715 | * | |
716 | * $globref = \*foo::bar::; | |
717 | * Symbol::delete_package("foo"); | |
718 | * *$globref = \%baz::; | |
719 | * *$globref = *frelp::; | |
720 | * # calls mro_package_moved(%frelp::, %baz::, *$globref, NULL, 0) | |
721 | * | |
722 | * If newname is not null, then we trust that the caller gave us the | |
723 | * right name. Otherwise, we get it from the gv. But if the gv is not | |
724 | * in the symbol table, then we just return. | |
725 | */ | |
d056e33c FC |
726 | if(!newname && gv) { |
727 | SV * const namesv = sv_newmortal(); | |
62c1e33f | 728 | STRLEN len; |
d056e33c | 729 | gv_fullname4(namesv, gv, NULL, 0); |
35759254 | 730 | if(gv_fetchsv(namesv, GV_NOADD_NOINIT, SVt_PVGV) != gv) return; |
62c1e33f FC |
731 | newname = SvPV_const(namesv, len); |
732 | newname_len = len - 2; /* skip trailing :: */ | |
d056e33c | 733 | } |
35759254 | 734 | if(newname_len < 0) newname_len = -newname_len; |
c8bbf675 | 735 | |
80ebaca2 FC |
736 | /* Get a list of all the affected classes. */ |
737 | /* We cannot simply pass them all to mro_isa_changed_in to avoid | |
738 | the list, as that function assumes that only one package has | |
739 | changed. It does not work with: | |
740 | ||
741 | @foo::ISA = qw( B B::B ); | |
742 | *B:: = delete $::{"A::"}; | |
743 | ||
744 | as neither B nor B::B can be updated before the other, since they | |
745 | will reset caches on foo, which will see either B or B::B with the | |
746 | wrong name. The names must be set on *all* affected stashes before | |
beeda143 | 747 | we do anything else. (And linearisations must be cleared, too.) |
80ebaca2 FC |
748 | */ |
749 | stashes = (HV *) sv_2mortal((SV *)newHV()); | |
b89cdb22 FC |
750 | mro_gather_and_rename( |
751 | stashes, (HV *) sv_2mortal((SV *)newHV()), | |
752 | stash, oldstash, newname, newname_len | |
753 | ); | |
80ebaca2 | 754 | |
80ebaca2 FC |
755 | /* Once the caches have been wiped on all the classes, call |
756 | mro_isa_changed_in on each. */ | |
757 | hv_iterinit(stashes); | |
758 | while((iter = hv_iternext(stashes))) { | |
90ba1f34 FC |
759 | HV * const stash = *(HV **)HEK_KEY(HeKEY_hek(iter)); |
760 | if(HvENAME(stash)) { | |
761 | /* We have to restore the original meta->isa (that | |
762 | mro_gather_and_rename set aside for us) this way, in case | |
763 | one class in this list is a superclass of a another class | |
764 | that we have already encountered. In such a case, meta->isa | |
765 | will have been overwritten without old entries being deleted | |
766 | from PL_isarev. */ | |
767 | struct mro_meta * const meta = HvMROMETA(stash); | |
768 | if(meta->isa != (HV *)HeVAL(iter)){ | |
769 | SvREFCNT_dec(meta->isa); | |
770 | meta->isa | |
771 | = HeVAL(iter) == &PL_sv_yes | |
772 | ? NULL | |
773 | : (HV *)HeVAL(iter); | |
774 | HeVAL(iter) = NULL; /* We donated our reference count. */ | |
775 | } | |
776 | mro_isa_changed_in(stash); | |
777 | } | |
80ebaca2 FC |
778 | } |
779 | } | |
780 | ||
781 | void | |
b89cdb22 FC |
782 | S_mro_gather_and_rename(pTHX_ HV * const stashes, HV * const seen_stashes, |
783 | HV *stash, HV *oldstash, const char *name, | |
784 | I32 namlen) | |
80ebaca2 FC |
785 | { |
786 | register XPVHV* xhv; | |
787 | register HE *entry; | |
788 | I32 riter = -1; | |
789 | const bool stash_had_name = stash && HvENAME(stash); | |
790 | HV *seen = NULL; | |
791 | HV *isarev = NULL; | |
792 | SV **svp; | |
793 | ||
794 | PERL_ARGS_ASSERT_MRO_GATHER_AND_RENAME; | |
795 | ||
b89cdb22 FC |
796 | /* We use the seen_stashes hash to keep track of which packages have |
797 | been encountered so far. This must be separate from the main list of | |
798 | stashes, as we need to distinguish between stashes being assigned | |
799 | and stashes being replaced/deleted. (A nested stash can be on both | |
800 | sides of an assignment. We cannot simply skip iterating through a | |
801 | stash on the right if we have seen it on the left, as it will not | |
802 | get its ename assigned to it.) | |
803 | ||
804 | To avoid allocating extra SVs, instead of a bitfield we can make | |
805 | bizarre use of immortals: | |
806 | ||
807 | &PL_sv_undef: seen on the left (oldstash) | |
808 | &PL_sv_no : seen on the right (stash) | |
809 | &PL_sv_yes : seen on both sides | |
810 | ||
811 | */ | |
812 | ||
80ebaca2 FC |
813 | if(oldstash) { |
814 | /* Add to the big list. */ | |
90ba1f34 | 815 | struct mro_meta * meta; |
80ebaca2 FC |
816 | HE * const entry |
817 | = (HE *) | |
818 | hv_common( | |
b89cdb22 | 819 | seen_stashes, NULL, (const char *)&oldstash, sizeof(HV *), 0, |
df5f182b | 820 | HV_FETCH_LVALUE|HV_FETCH_EMPTY_HE, NULL, 0 |
80ebaca2 | 821 | ); |
b89cdb22 | 822 | if(HeVAL(entry) == &PL_sv_undef || HeVAL(entry) == &PL_sv_yes) { |
80ebaca2 FC |
823 | oldstash = NULL; |
824 | goto check_stash; | |
825 | } | |
b89cdb22 FC |
826 | HeVAL(entry) |
827 | = HeVAL(entry) == &PL_sv_no ? &PL_sv_yes : &PL_sv_undef; | |
90ba1f34 | 828 | meta = HvMROMETA(oldstash); |
b89cdb22 FC |
829 | (void) |
830 | hv_store( | |
831 | stashes, (const char *)&oldstash, sizeof(HV *), | |
90ba1f34 FC |
832 | meta->isa |
833 | ? SvREFCNT_inc_simple_NN((SV *)meta->isa) | |
834 | : &PL_sv_yes, | |
835 | 0 | |
b89cdb22 | 836 | ); |
beeda143 | 837 | CLEAR_LINEAR(meta); |
80ebaca2 FC |
838 | |
839 | /* Update the effective name. */ | |
840 | if(HvENAME_get(oldstash)) { | |
841 | const HEK * const enamehek = HvENAME_HEK(oldstash); | |
842 | if(PL_stashcache) | |
d7fbb1de | 843 | (void) |
80ebaca2 FC |
844 | hv_delete(PL_stashcache, name, namlen, G_DISCARD); |
845 | hv_ename_delete(oldstash, name, namlen); | |
846 | ||
847 | /* If the name deletion caused a name change, then we are not | |
848 | * going to call mro_isa_changed_in with this name (and not at all | |
849 | * if it has become anonymous) so we need to delete old isarev | |
850 | * entries here, both those in the superclasses and this class’s | |
851 | * own list of subclasses. We simply delete the latter from | |
852 | * from PL_isarev, since we still need it. hv_delete mortifies it | |
853 | * for us, so sv_2mortal is not necessary. */ | |
854 | if(HvENAME_HEK(oldstash) != enamehek) { | |
80ebaca2 FC |
855 | if(meta->isa && HvARRAY(meta->isa)) |
856 | mro_clean_isarev(meta->isa, name, namlen, NULL); | |
857 | isarev = (HV *)hv_delete(PL_isarev, name, namlen, 0); | |
858 | } | |
859 | } | |
d7fbb1de | 860 | } |
80ebaca2 | 861 | check_stash: |
8b9e80a3 | 862 | if(stash) { |
80ebaca2 FC |
863 | hv_ename_add(stash, name, namlen); |
864 | ||
b89cdb22 FC |
865 | /* Add it to the big list if it needs |
866 | * mro_isa_changed_in called on it. That happens if it was | |
80ebaca2 FC |
867 | * detached from the symbol table (so it had no HvENAME) before |
868 | * being assigned to the spot named by the ‘name’ variable, because | |
869 | * its cached isa linerisation is now stale (the effective name | |
870 | * having changed), and subclasses will then use that cache when | |
871 | * mro_package_moved calls mro_isa_changed_in. (See | |
8b9e80a3 | 872 | * [perl #77358].) |
80ebaca2 | 873 | * |
8b9e80a3 | 874 | * If it did have a name, then its previous name is still |
80ebaca2 FC |
875 | * used in isa caches, and there is no need for |
876 | * mro_package_moved to call mro_isa_changed_in. | |
8b9e80a3 | 877 | */ |
80ebaca2 FC |
878 | |
879 | entry | |
880 | = (HE *) | |
881 | hv_common( | |
b89cdb22 | 882 | seen_stashes, NULL, (const char *)&stash, sizeof(HV *), 0, |
df5f182b | 883 | HV_FETCH_LVALUE|HV_FETCH_EMPTY_HE, NULL, 0 |
80ebaca2 | 884 | ); |
b89cdb22 | 885 | if(HeVAL(entry) == &PL_sv_yes || HeVAL(entry) == &PL_sv_no) |
80ebaca2 | 886 | stash = NULL; |
b89cdb22 FC |
887 | else { |
888 | HeVAL(entry) | |
889 | = HeVAL(entry) == &PL_sv_undef ? &PL_sv_yes : &PL_sv_no; | |
890 | if(!stash_had_name) | |
90ba1f34 FC |
891 | { |
892 | struct mro_meta * const meta = HvMROMETA(stash); | |
b89cdb22 FC |
893 | (void) |
894 | hv_store( | |
895 | stashes, (const char *)&stash, sizeof(HV *), | |
90ba1f34 FC |
896 | meta->isa |
897 | ? SvREFCNT_inc_simple_NN((SV *)meta->isa) | |
898 | : &PL_sv_yes, | |
899 | 0 | |
b89cdb22 | 900 | ); |
beeda143 | 901 | CLEAR_LINEAR(meta); |
90ba1f34 | 902 | } |
b89cdb22 | 903 | } |
8b9e80a3 | 904 | } |
d7fbb1de | 905 | |
80ebaca2 FC |
906 | if(!stash && !oldstash) |
907 | /* Both stashes have been encountered already. */ | |
908 | return; | |
909 | ||
910 | /* Add all the subclasses to the big list. */ | |
911 | if( | |
912 | isarev | |
913 | || ( | |
914 | (svp = hv_fetch(PL_isarev, name, namlen, 0)) | |
915 | && (isarev = MUTABLE_HV(*svp)) | |
916 | ) | |
917 | ) { | |
918 | HE *iter; | |
919 | hv_iterinit(isarev); | |
920 | while((iter = hv_iternext(isarev))) { | |
921 | I32 len; | |
922 | const char* const revkey = hv_iterkey(iter, &len); | |
923 | HV* revstash = gv_stashpvn(revkey, len, 0); | |
90ba1f34 | 924 | struct mro_meta * meta; |
80ebaca2 FC |
925 | |
926 | if(!revstash) continue; | |
90ba1f34 | 927 | meta = HvMROMETA(revstash); |
b89cdb22 FC |
928 | (void) |
929 | hv_store( | |
930 | stashes, (const char *)&revstash, sizeof(HV *), | |
90ba1f34 FC |
931 | meta->isa |
932 | ? SvREFCNT_inc_simple_NN((SV *)meta->isa) | |
933 | : &PL_sv_yes, | |
934 | 0 | |
b89cdb22 | 935 | ); |
beeda143 | 936 | CLEAR_LINEAR(meta); |
80ebaca2 FC |
937 | } |
938 | } | |
d056e33c FC |
939 | |
940 | if( | |
941 | (!stash || !HvARRAY(stash)) && (!oldstash || !HvARRAY(oldstash)) | |
d7fbb1de | 942 | ) return; |
c8bbf675 FC |
943 | |
944 | /* This is partly based on code in hv_iternext_flags. We are not call- | |
945 | ing that here, as we want to avoid resetting the hash iterator. */ | |
946 | ||
d056e33c FC |
947 | /* Skip the entire loop if the hash is empty. */ |
948 | if(oldstash && HvUSEDKEYS(oldstash)) { | |
949 | xhv = (XPVHV*)SvANY(oldstash); | |
dbe2fffc | 950 | seen = (HV *) sv_2mortal((SV *)newHV()); |
d056e33c | 951 | |
80ebaca2 FC |
952 | /* Iterate through entries in the oldstash, adding them to the |
953 | list, meanwhile doing the equivalent of $seen{$key} = 1. | |
d056e33c FC |
954 | */ |
955 | ||
956 | while (++riter <= (I32)xhv->xhv_max) { | |
957 | entry = (HvARRAY(oldstash))[riter]; | |
958 | ||
959 | /* Iterate through the entries in this list */ | |
960 | for(; entry; entry = HeNEXT(entry)) { | |
961 | const char* key; | |
962 | I32 len; | |
963 | ||
964 | /* If this entry is not a glob, ignore it. | |
965 | Try the next. */ | |
966 | if (!isGV(HeVAL(entry))) continue; | |
967 | ||
968 | key = hv_iterkey(entry, &len); | |
969 | if(len > 1 && key[len-2] == ':' && key[len-1] == ':') { | |
970 | HV * const oldsubstash = GvHV(HeVAL(entry)); | |
971 | SV ** const stashentry | |
972 | = stash ? hv_fetch(stash, key, len, 0) : NULL; | |
35759254 | 973 | HV *substash = NULL; |
62c1e33f FC |
974 | |
975 | /* Avoid main::main::main::... */ | |
976 | if(oldsubstash == oldstash) continue; | |
977 | ||
d056e33c | 978 | if( |
35759254 FC |
979 | ( |
980 | stashentry && *stashentry | |
981 | && (substash = GvHV(*stashentry)) | |
982 | ) | |
00169e2c | 983 | || (oldsubstash && HvENAME_get(oldsubstash)) |
d056e33c | 984 | ) |
35759254 FC |
985 | { |
986 | /* Add :: and the key (minus the trailing ::) | |
987 | to newname. */ | |
988 | SV *namesv | |
80ebaca2 FC |
989 | = newSVpvn_flags(name, namlen, SVs_TEMP); |
990 | { | |
991 | const char *name; | |
992 | STRLEN namlen; | |
993 | sv_catpvs(namesv, "::"); | |
994 | sv_catpvn(namesv, key, len-2); | |
995 | name = SvPV_const(namesv, namlen); | |
996 | mro_gather_and_rename( | |
b89cdb22 FC |
997 | stashes, seen_stashes, |
998 | substash, oldsubstash, name, namlen | |
80ebaca2 FC |
999 | ); |
1000 | } | |
35759254 | 1001 | } |
d056e33c FC |
1002 | |
1003 | (void)hv_store(seen, key, len, &PL_sv_yes, 0); | |
1004 | } | |
1005 | } | |
1006 | } | |
1007 | } | |
c8bbf675 FC |
1008 | |
1009 | /* Skip the entire loop if the hash is empty. */ | |
d056e33c FC |
1010 | if (stash && HvUSEDKEYS(stash)) { |
1011 | xhv = (XPVHV*)SvANY(stash); | |
b89cdb22 | 1012 | riter = -1; |
d056e33c FC |
1013 | |
1014 | /* Iterate through the new stash, skipping $seen{$key} items, | |
b89cdb22 | 1015 | calling mro_gather_and_rename(stashes,seen,entry,NULL, ...). */ |
c8bbf675 FC |
1016 | while (++riter <= (I32)xhv->xhv_max) { |
1017 | entry = (HvARRAY(stash))[riter]; | |
1018 | ||
1019 | /* Iterate through the entries in this list */ | |
1020 | for(; entry; entry = HeNEXT(entry)) { | |
1021 | const char* key; | |
1022 | I32 len; | |
1023 | ||
1024 | /* If this entry is not a glob, ignore it. | |
1025 | Try the next. */ | |
1026 | if (!isGV(HeVAL(entry))) continue; | |
1027 | ||
1028 | key = hv_iterkey(entry, &len); | |
1029 | if(len > 1 && key[len-2] == ':' && key[len-1] == ':') { | |
d056e33c FC |
1030 | HV *substash; |
1031 | ||
1032 | /* If this entry was seen when we iterated through the | |
1033 | oldstash, skip it. */ | |
1034 | if(seen && hv_exists(seen, key, len)) continue; | |
1035 | ||
1036 | /* We get here only if this stash has no corresponding | |
1037 | entry in the stash being replaced. */ | |
1038 | ||
1039 | substash = GvHV(HeVAL(entry)); | |
35759254 | 1040 | if(substash) { |
62c1e33f | 1041 | SV *namesv; |
80ebaca2 FC |
1042 | const char *subname; |
1043 | STRLEN subnamlen; | |
62c1e33f FC |
1044 | |
1045 | /* Avoid checking main::main::main::... */ | |
1046 | if(substash == stash) continue; | |
1047 | ||
d056e33c FC |
1048 | /* Add :: and the key (minus the trailing ::) |
1049 | to newname. */ | |
62c1e33f | 1050 | namesv |
80ebaca2 | 1051 | = newSVpvn_flags(name, namlen, SVs_TEMP); |
d056e33c FC |
1052 | sv_catpvs(namesv, "::"); |
1053 | sv_catpvn(namesv, key, len-2); | |
80ebaca2 FC |
1054 | subname = SvPV_const(namesv, subnamlen); |
1055 | mro_gather_and_rename( | |
b89cdb22 FC |
1056 | stashes, seen_stashes, |
1057 | substash, NULL, subname, subnamlen | |
d056e33c FC |
1058 | ); |
1059 | } | |
c8bbf675 FC |
1060 | } |
1061 | } | |
1062 | } | |
1063 | } | |
1064 | } | |
1065 | ||
1066 | /* | |
e1a479c5 BB |
1067 | =for apidoc mro_method_changed_in |
1068 | ||
47c9dd14 BB |
1069 | Invalidates method caching on any child classes |
1070 | of the given stash, so that they might notice | |
1071 | the changes in this one. | |
e1a479c5 BB |
1072 | |
1073 | Ideally, all instances of C<PL_sub_generation++> in | |
dd69841b BB |
1074 | perl source outside of C<mro.c> should be |
1075 | replaced by calls to this. | |
1076 | ||
1077 | Perl automatically handles most of the common | |
1078 | ways a method might be redefined. However, there | |
1079 | are a few ways you could change a method in a stash | |
1080 | without the cache code noticing, in which case you | |
1081 | need to call this method afterwards: | |
e1a479c5 | 1082 | |
dd69841b BB |
1083 | 1) Directly manipulating the stash HV entries from |
1084 | XS code. | |
e1a479c5 | 1085 | |
dd69841b BB |
1086 | 2) Assigning a reference to a readonly scalar |
1087 | constant into a stash entry in order to create | |
1088 | a constant subroutine (like constant.pm | |
1089 | does). | |
1090 | ||
1091 | This same method is available from pure perl | |
1092 | via, C<mro::method_changed_in(classname)>. | |
e1a479c5 BB |
1093 | |
1094 | =cut | |
1095 | */ | |
1096 | void | |
1097 | Perl_mro_method_changed_in(pTHX_ HV *stash) | |
1098 | { | |
00169e2c FC |
1099 | const char * const stashname = HvENAME_get(stash); |
1100 | const STRLEN stashname_len = HvENAMELEN_get(stash); | |
dd69841b | 1101 | |
1e05feb3 | 1102 | SV ** const svp = hv_fetch(PL_isarev, stashname, stashname_len, 0); |
85fbaab2 | 1103 | HV * const isarev = svp ? MUTABLE_HV(*svp) : NULL; |
e1a479c5 | 1104 | |
7918f24d NC |
1105 | PERL_ARGS_ASSERT_MRO_METHOD_CHANGED_IN; |
1106 | ||
2c7f4b87 BB |
1107 | if(!stashname) |
1108 | Perl_croak(aTHX_ "Can't call mro_method_changed_in() on anonymous symbol table"); | |
1109 | ||
70cd14a1 CB |
1110 | /* Inc the package generation, since a local method changed */ |
1111 | HvMROMETA(stash)->pkg_gen++; | |
1112 | ||
e1a479c5 BB |
1113 | /* If stash is UNIVERSAL, or one of UNIVERSAL's parents, |
1114 | invalidate all method caches globally */ | |
dd69841b BB |
1115 | if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL")) |
1116 | || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) { | |
e1a479c5 BB |
1117 | PL_sub_generation++; |
1118 | return; | |
1119 | } | |
1120 | ||
1121 | /* else, invalidate the method caches of all child classes, | |
1122 | but not itself */ | |
dd69841b | 1123 | if(isarev) { |
1e05feb3 AL |
1124 | HE* iter; |
1125 | ||
e1a479c5 BB |
1126 | hv_iterinit(isarev); |
1127 | while((iter = hv_iternext(isarev))) { | |
ec49eb61 NC |
1128 | I32 len; |
1129 | const char* const revkey = hv_iterkey(iter, &len); | |
1130 | HV* const revstash = gv_stashpvn(revkey, len, 0); | |
bc2cbbac BB |
1131 | struct mro_meta* mrometa; |
1132 | ||
1133 | if(!revstash) continue; | |
1134 | mrometa = HvMROMETA(revstash); | |
dd69841b | 1135 | mrometa->cache_gen++; |
e1a479c5 BB |
1136 | if(mrometa->mro_nextmethod) |
1137 | hv_clear(mrometa->mro_nextmethod); | |
1138 | } | |
1139 | } | |
1140 | } | |
1141 | ||
31b9005d NC |
1142 | void |
1143 | Perl_mro_set_mro(pTHX_ struct mro_meta *const meta, SV *const name) | |
1144 | { | |
1145 | const struct mro_alg *const which = Perl_mro_get_from_name(aTHX_ name); | |
1146 | ||
1147 | PERL_ARGS_ASSERT_MRO_SET_MRO; | |
1148 | ||
1149 | if (!which) | |
1150 | Perl_croak(aTHX_ "Invalid mro name: '%"SVf"'", name); | |
1151 | ||
1152 | if(meta->mro_which != which) { | |
9953ff72 | 1153 | if (meta->mro_linear_current && !meta->mro_linear_all) { |
31b9005d NC |
1154 | /* If we were storing something directly, put it in the hash before |
1155 | we lose it. */ | |
1156 | Perl_mro_set_private_data(aTHX_ meta, meta->mro_which, | |
3a6fa573 | 1157 | MUTABLE_SV(meta->mro_linear_current)); |
31b9005d NC |
1158 | } |
1159 | meta->mro_which = which; | |
1160 | /* Scrub our cached pointer to the private data. */ | |
3a6fa573 | 1161 | meta->mro_linear_current = NULL; |
31b9005d NC |
1162 | /* Only affects local method cache, not |
1163 | even child classes */ | |
1164 | meta->cache_gen++; | |
1165 | if(meta->mro_nextmethod) | |
1166 | hv_clear(meta->mro_nextmethod); | |
1167 | } | |
1168 | } | |
1169 | ||
e1a479c5 BB |
1170 | #include "XSUB.h" |
1171 | ||
e1a479c5 | 1172 | XS(XS_mro_method_changed_in); |
e1a479c5 BB |
1173 | |
1174 | void | |
1175 | Perl_boot_core_mro(pTHX) | |
1176 | { | |
1177 | dVAR; | |
1178 | static const char file[] = __FILE__; | |
1179 | ||
a3e6e81e | 1180 | Perl_mro_register(aTHX_ &dfs_alg); |
a3e6e81e | 1181 | |
e1a479c5 | 1182 | newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$"); |
e1a479c5 BB |
1183 | } |
1184 | ||
e1a479c5 BB |
1185 | XS(XS_mro_method_changed_in) |
1186 | { | |
1187 | dVAR; | |
1188 | dXSARGS; | |
1189 | SV* classname; | |
1190 | HV* class_stash; | |
1191 | ||
e1a479c5 | 1192 | if(items != 1) |
afa74d42 | 1193 | croak_xs_usage(cv, "classname"); |
e1a479c5 BB |
1194 | |
1195 | classname = ST(0); | |
1196 | ||
1197 | class_stash = gv_stashsv(classname, 0); | |
1198 | if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname)); | |
1199 | ||
1200 | mro_method_changed_in(class_stash); | |
1201 | ||
1202 | XSRETURN_EMPTY; | |
1203 | } | |
1204 | ||
e1a479c5 BB |
1205 | /* |
1206 | * Local variables: | |
1207 | * c-indentation-style: bsd | |
1208 | * c-basic-offset: 4 | |
1209 | * indent-tabs-mode: t | |
1210 | * End: | |
1211 | * | |
1212 | * ex: set ts=8 sts=4 sw=4 noet: | |
1213 | */ |