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1/* mro.c
2 *
3 * Copyright (c) 2007 Brandon L Black
1129b882 4 * Copyright (c) 2007, 2008 Larry Wall and others
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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/*
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19=head1 MRO Functions
20
21These 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
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28#include "perl.h"
29
a3e6e81e
NC
30static const struct mro_alg dfs_alg =
31 {S_mro_get_linear_isa_dfs, "dfs", 3, 0, 0};
3d76853f 32
fa60396f
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33SV *
34Perl_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
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50
51 return *data;
52}
53
54SV *
55Perl_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) {
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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
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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
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89 }
90
9953ff72 91 if (!Perl_hv_common(aTHX_ smeta->mro_linear_all, NULL,
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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
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102const struct mro_alg *
103Perl_mro_get_from_name(pTHX_ SV *name) {
104 SV **data;
105
106 PERL_ARGS_ASSERT_MRO_GET_FROM_NAME;
107
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108 data = (SV **)Perl_hv_common(aTHX_ PL_registered_mros, name, NULL, 0, 0,
109 HV_FETCH_JUST_SV, NULL, 0);
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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
117void
118Perl_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 }
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131}
132
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133struct mro_meta*
134Perl_mro_meta_init(pTHX_ HV* stash)
135{
9fe4aecf 136 struct mro_meta* newmeta;
e1a479c5 137
7918f24d 138 PERL_ARGS_ASSERT_MRO_META_INIT;
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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;
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146
147 return newmeta;
148}
149
150#if defined(USE_ITHREADS)
151
152/* for sv_dup on new threads */
153struct mro_meta*
154Perl_mro_meta_dup(pTHX_ struct mro_meta* smeta, CLONE_PARAMS* param)
155{
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156 struct mro_meta* newmeta;
157
7918f24d 158 PERL_ARGS_ASSERT_MRO_META_DUP;
e1a479c5 159
33e12d9d
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160 Newx(newmeta, 1, struct mro_meta);
161 Copy(smeta, newmeta, 1, struct mro_meta);
162
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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));
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166 /* This is just acting as a shortcut pointer, and will be automatically
167 updated on the first get. */
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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
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173 }
174
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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));
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181
182 return newmeta;
183}
184
185#endif /* USE_ITHREADS */
186
187/*
188=for apidoc mro_get_linear_isa_dfs
189
190Returns the Depth-First Search linearization of @ISA
191the given stash. The return value is a read-only AV*.
192C<level> should be 0 (it is used internally in this
193function's recursion).
194
1c908217
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195You are responsible for C<SvREFCNT_inc()> on the
196return value if you plan to store it anywhere
197semi-permanently (otherwise it might be deleted
198out from under you the next time the cache is
199invalidated).
200
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201=cut
202*/
4befac30 203static AV*
94d1e706 204S_mro_get_linear_isa_dfs(pTHX_ HV *stash, U32 level)
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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;
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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");
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225
226 if (level > 100)
227 Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
190d0b22 228 HEK_KEY(stashhek));
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229
230 meta = HvMROMETA(stash);
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231
232 /* return cache if valid */
a3e6e81e 233 if((retval = MUTABLE_AV(MRO_GET_PRIVATE_DATA(meta, &dfs_alg)))) {
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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 */
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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) */
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261 while (items--) {
262 SV* const sv = *svp++;
263 HV* const basestash = gv_stashsv(sv, 0);
ffd8da72
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264 SV *const *subrv_p;
265 I32 subrv_items;
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266
267 if (!basestash) {
1c908217
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268 /* if no stash exists for this @ISA member,
269 simply add it to the MRO and move on */
ffd8da72
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270 subrv_p = &sv;
271 subrv_items = 1;
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272 }
273 else {
1c908217 274 /* otherwise, recurse into ourselves for the MRO
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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
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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
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380=for apidoc mro_get_linear_isa
381
382Returns either C<mro_get_linear_isa_c3> or
383C<mro_get_linear_isa_dfs> for the given stash,
384dependant upon which MRO is in effect
385for that stash. The return value is a
386read-only AV*.
387
1c908217
RGS
388You are responsible for C<SvREFCNT_inc()> on the
389return value if you plan to store it anywhere
390semi-permanently (otherwise it might be deleted
391out from under you the next time the cache is
392invalidated).
393
e1a479c5
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394=cut
395*/
396AV*
397Perl_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
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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
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435}
436
437/*
438=for apidoc mro_isa_changed_in
439
1c908217 440Takes the necessary steps (cache invalidations, mostly)
e1a479c5
BB
441when the @ISA of the given package has changed. Invoked
442by 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 460void
4df35a07 461Perl_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 */
650STATIC void
651S_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
679Call this function to signal to a stash that it has been assigned to
680another spot in the stash hierarchy. C<stash> is the stash that has been
681assigned. C<oldstash> is the stash it replaces, if any. C<gv> is the glob
afdbe55d 682that is actually being assigned to.
d056e33c 683
35759254 684This can also be called with a null first argument to
d056e33c
FC
685indicate that C<oldstash> has been deleted.
686
687This function invalidates isa caches on the old stash, on all subpackages
688nested inside it, and on the subclasses of all those, including
689non-existent packages that have corresponding entries in C<stash>.
c8bbf675 690
80ebaca2
FC
691It also sets the effective names (C<HvENAME>) on all the stashes as
692appropriate.
693
0290c710 694If the C<gv> is present and is not in the symbol table, then this function
afdbe55d 695simply returns. This checked will be skipped if C<flags & 1>.
0290c710 696
c8bbf675
FC
697=cut
698*/
699void
35759254 700Perl_mro_package_moved(pTHX_ HV * const stash, HV * const oldstash,
afdbe55d 701 const GV * const gv, U32 flags)
c8bbf675 702{
afdbe55d
FC
703 SV * const namesv = sv_newmortal();
704 const char * newname;
705 STRLEN newname_len;
80ebaca2
FC
706 HV *stashes;
707 HE* iter;
62c1e33f 708
afdbe55d 709 PERL_ARGS_ASSERT_MRO_PACKAGE_MOVED;
35759254 710 assert(stash || oldstash);
35759254
FC
711
712 /* Determine the name of the location that stash was assigned to
713 * or from which oldstash was removed.
714 *
928eb066 715 * We cannot reliably use the name in oldstash, because it may have
35759254
FC
716 * been deleted from the location in the symbol table that its name
717 * suggests, as in this case:
718 *
719 * $globref = \*foo::bar::;
720 * Symbol::delete_package("foo");
721 * *$globref = \%baz::;
722 * *$globref = *frelp::;
723 * # calls mro_package_moved(%frelp::, %baz::, *$globref, NULL, 0)
724 *
afdbe55d 725 * So we get it from the gv. But if the gv is not
0290c710 726 * in the symbol table, then we just return. We skip that check,
afdbe55d 727 * however, if flags & 1.
35759254 728 */
afdbe55d
FC
729 gv_fullname4(namesv, gv, NULL, 0);
730 if( !(flags & 1)
0290c710 731 && gv_fetchsv(namesv, GV_NOADD_NOINIT, SVt_PVGV) != gv ) return;
afdbe55d
FC
732 newname = SvPV_const(namesv, newname_len);
733 newname_len -= 2; /* skip trailing :: */
c8bbf675 734
80ebaca2
FC
735 /* Get a list of all the affected classes. */
736 /* We cannot simply pass them all to mro_isa_changed_in to avoid
737 the list, as that function assumes that only one package has
738 changed. It does not work with:
739
740 @foo::ISA = qw( B B::B );
741 *B:: = delete $::{"A::"};
742
743 as neither B nor B::B can be updated before the other, since they
744 will reset caches on foo, which will see either B or B::B with the
745 wrong name. The names must be set on *all* affected stashes before
beeda143 746 we do anything else. (And linearisations must be cleared, too.)
80ebaca2
FC
747 */
748 stashes = (HV *) sv_2mortal((SV *)newHV());
b89cdb22
FC
749 mro_gather_and_rename(
750 stashes, (HV *) sv_2mortal((SV *)newHV()),
751 stash, oldstash, newname, newname_len
752 );
80ebaca2 753
80ebaca2
FC
754 /* Once the caches have been wiped on all the classes, call
755 mro_isa_changed_in on each. */
756 hv_iterinit(stashes);
757 while((iter = hv_iternext(stashes))) {
90ba1f34
FC
758 HV * const stash = *(HV **)HEK_KEY(HeKEY_hek(iter));
759 if(HvENAME(stash)) {
760 /* We have to restore the original meta->isa (that
761 mro_gather_and_rename set aside for us) this way, in case
762 one class in this list is a superclass of a another class
763 that we have already encountered. In such a case, meta->isa
764 will have been overwritten without old entries being deleted
765 from PL_isarev. */
766 struct mro_meta * const meta = HvMROMETA(stash);
767 if(meta->isa != (HV *)HeVAL(iter)){
768 SvREFCNT_dec(meta->isa);
769 meta->isa
770 = HeVAL(iter) == &PL_sv_yes
771 ? NULL
772 : (HV *)HeVAL(iter);
773 HeVAL(iter) = NULL; /* We donated our reference count. */
774 }
775 mro_isa_changed_in(stash);
776 }
80ebaca2
FC
777 }
778}
779
780void
b89cdb22
FC
781S_mro_gather_and_rename(pTHX_ HV * const stashes, HV * const seen_stashes,
782 HV *stash, HV *oldstash, const char *name,
783 I32 namlen)
80ebaca2
FC
784{
785 register XPVHV* xhv;
786 register HE *entry;
787 I32 riter = -1;
788 const bool stash_had_name = stash && HvENAME(stash);
789 HV *seen = NULL;
790 HV *isarev = NULL;
791 SV **svp;
792
793 PERL_ARGS_ASSERT_MRO_GATHER_AND_RENAME;
794
b89cdb22
FC
795 /* We use the seen_stashes hash to keep track of which packages have
796 been encountered so far. This must be separate from the main list of
797 stashes, as we need to distinguish between stashes being assigned
798 and stashes being replaced/deleted. (A nested stash can be on both
799 sides of an assignment. We cannot simply skip iterating through a
800 stash on the right if we have seen it on the left, as it will not
801 get its ename assigned to it.)
802
803 To avoid allocating extra SVs, instead of a bitfield we can make
804 bizarre use of immortals:
805
806 &PL_sv_undef: seen on the left (oldstash)
807 &PL_sv_no : seen on the right (stash)
808 &PL_sv_yes : seen on both sides
809
810 */
811
80ebaca2
FC
812 if(oldstash) {
813 /* Add to the big list. */
90ba1f34 814 struct mro_meta * meta;
80ebaca2
FC
815 HE * const entry
816 = (HE *)
817 hv_common(
b89cdb22 818 seen_stashes, NULL, (const char *)&oldstash, sizeof(HV *), 0,
df5f182b 819 HV_FETCH_LVALUE|HV_FETCH_EMPTY_HE, NULL, 0
80ebaca2 820 );
b89cdb22 821 if(HeVAL(entry) == &PL_sv_undef || HeVAL(entry) == &PL_sv_yes) {
80ebaca2
FC
822 oldstash = NULL;
823 goto check_stash;
824 }
b89cdb22
FC
825 HeVAL(entry)
826 = HeVAL(entry) == &PL_sv_no ? &PL_sv_yes : &PL_sv_undef;
90ba1f34 827 meta = HvMROMETA(oldstash);
b89cdb22
FC
828 (void)
829 hv_store(
830 stashes, (const char *)&oldstash, sizeof(HV *),
90ba1f34
FC
831 meta->isa
832 ? SvREFCNT_inc_simple_NN((SV *)meta->isa)
833 : &PL_sv_yes,
834 0
b89cdb22 835 );
beeda143 836 CLEAR_LINEAR(meta);
80ebaca2
FC
837
838 /* Update the effective name. */
839 if(HvENAME_get(oldstash)) {
840 const HEK * const enamehek = HvENAME_HEK(oldstash);
841 if(PL_stashcache)
d7fbb1de 842 (void)
80ebaca2 843 hv_delete(PL_stashcache, name, namlen, G_DISCARD);
27a1175b 844 hv_ename_delete(oldstash, name, namlen, 0);
80ebaca2
FC
845
846 /* If the name deletion caused a name change, then we are not
847 * going to call mro_isa_changed_in with this name (and not at all
848 * if it has become anonymous) so we need to delete old isarev
849 * entries here, both those in the superclasses and this class’s
850 * own list of subclasses. We simply delete the latter from
851 * from PL_isarev, since we still need it. hv_delete mortifies it
852 * for us, so sv_2mortal is not necessary. */
853 if(HvENAME_HEK(oldstash) != enamehek) {
80ebaca2
FC
854 if(meta->isa && HvARRAY(meta->isa))
855 mro_clean_isarev(meta->isa, name, namlen, NULL);
856 isarev = (HV *)hv_delete(PL_isarev, name, namlen, 0);
857 }
858 }
d7fbb1de 859 }
80ebaca2 860 check_stash:
8b9e80a3 861 if(stash) {
27a1175b 862 hv_ename_add(stash, name, namlen, 0);
80ebaca2 863
b89cdb22
FC
864 /* Add it to the big list if it needs
865 * mro_isa_changed_in called on it. That happens if it was
80ebaca2
FC
866 * detached from the symbol table (so it had no HvENAME) before
867 * being assigned to the spot named by the ‘name’ variable, because
868 * its cached isa linerisation is now stale (the effective name
869 * having changed), and subclasses will then use that cache when
870 * mro_package_moved calls mro_isa_changed_in. (See
8b9e80a3 871 * [perl #77358].)
80ebaca2 872 *
8b9e80a3 873 * If it did have a name, then its previous name is still
80ebaca2
FC
874 * used in isa caches, and there is no need for
875 * mro_package_moved to call mro_isa_changed_in.
8b9e80a3 876 */
80ebaca2
FC
877
878 entry
879 = (HE *)
880 hv_common(
b89cdb22 881 seen_stashes, NULL, (const char *)&stash, sizeof(HV *), 0,
df5f182b 882 HV_FETCH_LVALUE|HV_FETCH_EMPTY_HE, NULL, 0
80ebaca2 883 );
b89cdb22 884 if(HeVAL(entry) == &PL_sv_yes || HeVAL(entry) == &PL_sv_no)
80ebaca2 885 stash = NULL;
b89cdb22
FC
886 else {
887 HeVAL(entry)
888 = HeVAL(entry) == &PL_sv_undef ? &PL_sv_yes : &PL_sv_no;
889 if(!stash_had_name)
90ba1f34
FC
890 {
891 struct mro_meta * const meta = HvMROMETA(stash);
b89cdb22
FC
892 (void)
893 hv_store(
894 stashes, (const char *)&stash, sizeof(HV *),
90ba1f34
FC
895 meta->isa
896 ? SvREFCNT_inc_simple_NN((SV *)meta->isa)
897 : &PL_sv_yes,
898 0
b89cdb22 899 );
beeda143 900 CLEAR_LINEAR(meta);
90ba1f34 901 }
b89cdb22 902 }
8b9e80a3 903 }
d7fbb1de 904
80ebaca2
FC
905 if(!stash && !oldstash)
906 /* Both stashes have been encountered already. */
907 return;
908
909 /* Add all the subclasses to the big list. */
910 if(
911 isarev
912 || (
913 (svp = hv_fetch(PL_isarev, name, namlen, 0))
914 && (isarev = MUTABLE_HV(*svp))
915 )
916 ) {
917 HE *iter;
918 hv_iterinit(isarev);
919 while((iter = hv_iternext(isarev))) {
920 I32 len;
921 const char* const revkey = hv_iterkey(iter, &len);
922 HV* revstash = gv_stashpvn(revkey, len, 0);
90ba1f34 923 struct mro_meta * meta;
80ebaca2
FC
924
925 if(!revstash) continue;
90ba1f34 926 meta = HvMROMETA(revstash);
b89cdb22
FC
927 (void)
928 hv_store(
929 stashes, (const char *)&revstash, sizeof(HV *),
90ba1f34
FC
930 meta->isa
931 ? SvREFCNT_inc_simple_NN((SV *)meta->isa)
932 : &PL_sv_yes,
933 0
b89cdb22 934 );
beeda143 935 CLEAR_LINEAR(meta);
80ebaca2
FC
936 }
937 }
d056e33c
FC
938
939 if(
940 (!stash || !HvARRAY(stash)) && (!oldstash || !HvARRAY(oldstash))
d7fbb1de 941 ) return;
c8bbf675
FC
942
943 /* This is partly based on code in hv_iternext_flags. We are not call-
944 ing that here, as we want to avoid resetting the hash iterator. */
945
d056e33c
FC
946 /* Skip the entire loop if the hash is empty. */
947 if(oldstash && HvUSEDKEYS(oldstash)) {
948 xhv = (XPVHV*)SvANY(oldstash);
dbe2fffc 949 seen = (HV *) sv_2mortal((SV *)newHV());
d056e33c 950
80ebaca2
FC
951 /* Iterate through entries in the oldstash, adding them to the
952 list, meanwhile doing the equivalent of $seen{$key} = 1.
d056e33c
FC
953 */
954
955 while (++riter <= (I32)xhv->xhv_max) {
956 entry = (HvARRAY(oldstash))[riter];
957
958 /* Iterate through the entries in this list */
959 for(; entry; entry = HeNEXT(entry)) {
960 const char* key;
961 I32 len;
962
963 /* If this entry is not a glob, ignore it.
964 Try the next. */
965 if (!isGV(HeVAL(entry))) continue;
966
967 key = hv_iterkey(entry, &len);
968 if(len > 1 && key[len-2] == ':' && key[len-1] == ':') {
969 HV * const oldsubstash = GvHV(HeVAL(entry));
970 SV ** const stashentry
971 = stash ? hv_fetch(stash, key, len, 0) : NULL;
35759254 972 HV *substash = NULL;
62c1e33f
FC
973
974 /* Avoid main::main::main::... */
975 if(oldsubstash == oldstash) continue;
976
d056e33c 977 if(
35759254
FC
978 (
979 stashentry && *stashentry
980 && (substash = GvHV(*stashentry))
981 )
00169e2c 982 || (oldsubstash && HvENAME_get(oldsubstash))
d056e33c 983 )
35759254
FC
984 {
985 /* Add :: and the key (minus the trailing ::)
986 to newname. */
987 SV *namesv
80ebaca2
FC
988 = newSVpvn_flags(name, namlen, SVs_TEMP);
989 {
990 const char *name;
991 STRLEN namlen;
992 sv_catpvs(namesv, "::");
993 sv_catpvn(namesv, key, len-2);
994 name = SvPV_const(namesv, namlen);
995 mro_gather_and_rename(
b89cdb22
FC
996 stashes, seen_stashes,
997 substash, oldsubstash, name, namlen
80ebaca2
FC
998 );
999 }
35759254 1000 }
d056e33c
FC
1001
1002 (void)hv_store(seen, key, len, &PL_sv_yes, 0);
1003 }
1004 }
1005 }
1006 }
c8bbf675
FC
1007
1008 /* Skip the entire loop if the hash is empty. */
d056e33c
FC
1009 if (stash && HvUSEDKEYS(stash)) {
1010 xhv = (XPVHV*)SvANY(stash);
b89cdb22 1011 riter = -1;
d056e33c
FC
1012
1013 /* Iterate through the new stash, skipping $seen{$key} items,
b89cdb22 1014 calling mro_gather_and_rename(stashes,seen,entry,NULL, ...). */
c8bbf675
FC
1015 while (++riter <= (I32)xhv->xhv_max) {
1016 entry = (HvARRAY(stash))[riter];
1017
1018 /* Iterate through the entries in this list */
1019 for(; entry; entry = HeNEXT(entry)) {
1020 const char* key;
1021 I32 len;
1022
1023 /* If this entry is not a glob, ignore it.
1024 Try the next. */
1025 if (!isGV(HeVAL(entry))) continue;
1026
1027 key = hv_iterkey(entry, &len);
1028 if(len > 1 && key[len-2] == ':' && key[len-1] == ':') {
d056e33c
FC
1029 HV *substash;
1030
1031 /* If this entry was seen when we iterated through the
1032 oldstash, skip it. */
1033 if(seen && hv_exists(seen, key, len)) continue;
1034
1035 /* We get here only if this stash has no corresponding
1036 entry in the stash being replaced. */
1037
1038 substash = GvHV(HeVAL(entry));
35759254 1039 if(substash) {
62c1e33f 1040 SV *namesv;
80ebaca2
FC
1041 const char *subname;
1042 STRLEN subnamlen;
62c1e33f
FC
1043
1044 /* Avoid checking main::main::main::... */
1045 if(substash == stash) continue;
1046
d056e33c
FC
1047 /* Add :: and the key (minus the trailing ::)
1048 to newname. */
62c1e33f 1049 namesv
80ebaca2 1050 = newSVpvn_flags(name, namlen, SVs_TEMP);
d056e33c
FC
1051 sv_catpvs(namesv, "::");
1052 sv_catpvn(namesv, key, len-2);
80ebaca2
FC
1053 subname = SvPV_const(namesv, subnamlen);
1054 mro_gather_and_rename(
b89cdb22
FC
1055 stashes, seen_stashes,
1056 substash, NULL, subname, subnamlen
d056e33c
FC
1057 );
1058 }
c8bbf675
FC
1059 }
1060 }
1061 }
1062 }
1063}
1064
1065/*
e1a479c5
BB
1066=for apidoc mro_method_changed_in
1067
47c9dd14
BB
1068Invalidates method caching on any child classes
1069of the given stash, so that they might notice
1070the changes in this one.
e1a479c5
BB
1071
1072Ideally, all instances of C<PL_sub_generation++> in
dd69841b
BB
1073perl source outside of C<mro.c> should be
1074replaced by calls to this.
1075
1076Perl automatically handles most of the common
1077ways a method might be redefined. However, there
1078are a few ways you could change a method in a stash
1079without the cache code noticing, in which case you
1080need to call this method afterwards:
e1a479c5 1081
dd69841b
BB
10821) Directly manipulating the stash HV entries from
1083XS code.
e1a479c5 1084
dd69841b
BB
10852) Assigning a reference to a readonly scalar
1086constant into a stash entry in order to create
1087a constant subroutine (like constant.pm
1088does).
1089
1090This same method is available from pure perl
1091via, C<mro::method_changed_in(classname)>.
e1a479c5
BB
1092
1093=cut
1094*/
1095void
1096Perl_mro_method_changed_in(pTHX_ HV *stash)
1097{
00169e2c
FC
1098 const char * const stashname = HvENAME_get(stash);
1099 const STRLEN stashname_len = HvENAMELEN_get(stash);
dd69841b 1100
1e05feb3 1101 SV ** const svp = hv_fetch(PL_isarev, stashname, stashname_len, 0);
85fbaab2 1102 HV * const isarev = svp ? MUTABLE_HV(*svp) : NULL;
e1a479c5 1103
7918f24d
NC
1104 PERL_ARGS_ASSERT_MRO_METHOD_CHANGED_IN;
1105
2c7f4b87
BB
1106 if(!stashname)
1107 Perl_croak(aTHX_ "Can't call mro_method_changed_in() on anonymous symbol table");
1108
70cd14a1
CB
1109 /* Inc the package generation, since a local method changed */
1110 HvMROMETA(stash)->pkg_gen++;
1111
e1a479c5
BB
1112 /* If stash is UNIVERSAL, or one of UNIVERSAL's parents,
1113 invalidate all method caches globally */
dd69841b
BB
1114 if((stashname_len == 9 && strEQ(stashname, "UNIVERSAL"))
1115 || (isarev && hv_exists(isarev, "UNIVERSAL", 9))) {
e1a479c5
BB
1116 PL_sub_generation++;
1117 return;
1118 }
1119
1120 /* else, invalidate the method caches of all child classes,
1121 but not itself */
dd69841b 1122 if(isarev) {
1e05feb3
AL
1123 HE* iter;
1124
e1a479c5
BB
1125 hv_iterinit(isarev);
1126 while((iter = hv_iternext(isarev))) {
ec49eb61
NC
1127 I32 len;
1128 const char* const revkey = hv_iterkey(iter, &len);
1129 HV* const revstash = gv_stashpvn(revkey, len, 0);
bc2cbbac
BB
1130 struct mro_meta* mrometa;
1131
1132 if(!revstash) continue;
1133 mrometa = HvMROMETA(revstash);
dd69841b 1134 mrometa->cache_gen++;
e1a479c5
BB
1135 if(mrometa->mro_nextmethod)
1136 hv_clear(mrometa->mro_nextmethod);
1137 }
1138 }
1139}
1140
31b9005d
NC
1141void
1142Perl_mro_set_mro(pTHX_ struct mro_meta *const meta, SV *const name)
1143{
1144 const struct mro_alg *const which = Perl_mro_get_from_name(aTHX_ name);
1145
1146 PERL_ARGS_ASSERT_MRO_SET_MRO;
1147
1148 if (!which)
1149 Perl_croak(aTHX_ "Invalid mro name: '%"SVf"'", name);
1150
1151 if(meta->mro_which != which) {
9953ff72 1152 if (meta->mro_linear_current && !meta->mro_linear_all) {
31b9005d
NC
1153 /* If we were storing something directly, put it in the hash before
1154 we lose it. */
1155 Perl_mro_set_private_data(aTHX_ meta, meta->mro_which,
3a6fa573 1156 MUTABLE_SV(meta->mro_linear_current));
31b9005d
NC
1157 }
1158 meta->mro_which = which;
1159 /* Scrub our cached pointer to the private data. */
3a6fa573 1160 meta->mro_linear_current = NULL;
31b9005d
NC
1161 /* Only affects local method cache, not
1162 even child classes */
1163 meta->cache_gen++;
1164 if(meta->mro_nextmethod)
1165 hv_clear(meta->mro_nextmethod);
1166 }
1167}
1168
e1a479c5
BB
1169#include "XSUB.h"
1170
e1a479c5 1171XS(XS_mro_method_changed_in);
e1a479c5
BB
1172
1173void
1174Perl_boot_core_mro(pTHX)
1175{
1176 dVAR;
1177 static const char file[] = __FILE__;
1178
a3e6e81e 1179 Perl_mro_register(aTHX_ &dfs_alg);
a3e6e81e 1180
e1a479c5 1181 newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$");
e1a479c5
BB
1182}
1183
e1a479c5
BB
1184XS(XS_mro_method_changed_in)
1185{
1186 dVAR;
1187 dXSARGS;
1188 SV* classname;
1189 HV* class_stash;
1190
e1a479c5 1191 if(items != 1)
afa74d42 1192 croak_xs_usage(cv, "classname");
e1a479c5
BB
1193
1194 classname = ST(0);
1195
1196 class_stash = gv_stashsv(classname, 0);
1197 if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname));
1198
1199 mro_method_changed_in(class_stash);
1200
1201 XSRETURN_EMPTY;
1202}
1203
e1a479c5
BB
1204/*
1205 * Local variables:
1206 * c-indentation-style: bsd
1207 * c-basic-offset: 4
1208 * indent-tabs-mode: t
1209 * End:
1210 *
1211 * ex: set ts=8 sts=4 sw=4 noet:
1212 */