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1 | |
| 2 | #include "EXTERN.h" |
| 3 | #include "perl.h" |
| 4 | #include "XSUB.h" |
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5 | |
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6 | /* Most of this code is backported from bleadperl's |
| 7 | mro.c, and then modified to work with Class::C3's |
| 8 | internals. |
| 9 | */ |
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10 | |
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11 | AV* |
| 12 | __mro_linear_isa_c3(pTHX_ HV* stash, HV* cache, I32 level) |
| 13 | { |
| 14 | AV* retval; |
| 15 | GV** gvp; |
| 16 | GV* gv; |
| 17 | AV* isa; |
| 18 | const char* stashname; |
| 19 | STRLEN stashname_len; |
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20 | |
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21 | assert(stash); |
| 22 | assert(HvAUX(stash)); |
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23 | |
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24 | stashname = HvNAME(stash); |
| 25 | stashname_len = strlen(stashname); |
| 26 | if (!stashname) |
| 27 | Perl_croak(aTHX_ |
| 28 | "Can't linearize anonymous symbol table"); |
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29 | |
| b23e9cb9 |
30 | if (level > 100) |
| 31 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
| 32 | stashname); |
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33 | |
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34 | if(!cache) { |
| 35 | cache = newHV(); |
| 36 | } |
| 37 | else { |
| 38 | /* XXX return cached entry for stashname if available */ |
| 39 | } |
| 40 | |
| 41 | /* not in cache, make a new one */ |
| 42 | |
| 43 | retval = (AV*)sv_2mortal((SV*)newAV()); |
| 44 | av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */ |
| 45 | |
| 46 | gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE); |
| 47 | isa = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL; |
| 48 | |
| 49 | if(isa && AvFILLp(isa) >= 0) { |
| 50 | SV** seqs_ptr; |
| 51 | I32 seqs_items; |
| 52 | HV* tails = (HV*)sv_2mortal((SV*)newHV()); |
| 53 | AV* seqs = (AV*)sv_2mortal((SV*)newAV()); |
| 54 | I32 items = AvFILLp(isa) + 1; |
| 55 | SV** isa_ptr = AvARRAY(isa); |
| 56 | while(items--) { |
| 57 | AV* isa_lin; |
| 58 | SV* isa_item = *isa_ptr++; |
| 59 | HV* isa_item_stash = gv_stashsv(isa_item, 0); |
| 60 | if(!isa_item_stash) { |
| 61 | isa_lin = newAV(); |
| 62 | av_push(isa_lin, newSVsv(isa_item)); |
| 63 | } |
| 64 | else { |
| 65 | isa_lin = (AV*)sv_2mortal((SV*)__mro_linear_isa_c3(isa_item_stash, cache, level + 1)); /* recursion */ |
| 66 | } |
| 67 | av_push(seqs, (SV*)av_make(AvFILLp(isa_lin)+1, AvARRAY(isa_lin))); |
| 68 | } |
| 69 | av_push(seqs, (SV*)av_make(AvFILLp(isa)+1, AvARRAY(isa))); |
| 70 | |
| 71 | seqs_ptr = AvARRAY(seqs); |
| 72 | seqs_items = AvFILLp(seqs) + 1; |
| 73 | while(seqs_items--) { |
| 74 | AV* seq = (AV*)*seqs_ptr++; |
| 75 | I32 seq_items = AvFILLp(seq); |
| 76 | if(seq_items > 0) { |
| 77 | SV** seq_ptr = AvARRAY(seq) + 1; |
| 78 | while(seq_items--) { |
| 79 | SV* seqitem = *seq_ptr++; |
| 80 | HE* he = hv_fetch_ent(tails, seqitem, 0, 0); |
| 81 | if(!he) { |
| 82 | hv_store_ent(tails, seqitem, newSViv(1), 0); |
| 83 | } |
| 84 | else { |
| 85 | SV* val = HeVAL(he); |
| 86 | sv_inc(val); |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | while(1) { |
| 93 | SV* seqhead = NULL; |
| 94 | SV* cand = NULL; |
| 95 | SV* winner = NULL; |
| 96 | SV* val; |
| 97 | HE* tail_entry; |
| 98 | AV* seq; |
| 99 | SV** avptr = AvARRAY(seqs); |
| 100 | items = AvFILLp(seqs)+1; |
| 101 | while(items--) { |
| 102 | SV** svp; |
| 103 | seq = (AV*)*avptr++; |
| 104 | if(AvFILLp(seq) < 0) continue; |
| 105 | svp = av_fetch(seq, 0, 0); |
| 106 | seqhead = *svp; |
| 107 | if(!winner) { |
| 108 | cand = seqhead; |
| 109 | if((tail_entry = hv_fetch_ent(tails, cand, 0, 0)) |
| 110 | && (val = HeVAL(tail_entry)) |
| 111 | && (SvIVx(val) > 0)) |
| 112 | continue; |
| 113 | winner = newSVsv(cand); |
| 114 | av_push(retval, winner); |
| 115 | } |
| 116 | if(!sv_cmp(seqhead, winner)) { |
| 117 | |
| 118 | /* this is basically shift(@seq) in void context */ |
| 119 | SvREFCNT_dec(*AvARRAY(seq)); |
| 120 | *AvARRAY(seq) = &PL_sv_undef; |
| 121 | AvARRAY(seq) = AvARRAY(seq) + 1; |
| 122 | AvMAX(seq)--; |
| 123 | AvFILLp(seq)--; |
| 124 | |
| 125 | if(AvFILLp(seq) < 0) continue; |
| 126 | svp = av_fetch(seq, 0, 0); |
| 127 | seqhead = *svp; |
| 128 | tail_entry = hv_fetch_ent(tails, seqhead, 0, 0); |
| 129 | val = HeVAL(tail_entry); |
| 130 | sv_dec(val); |
| 131 | } |
| 132 | } |
| 133 | if(!cand) break; |
| 134 | if(!winner) |
| 135 | Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': " |
| 136 | "merging failed on parent '%s'", stashname, SvPV_nolen(cand)); |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | SvREADONLY_on(retval); |
| 141 | SvREFCNT_inc(retval); /* for cache storage */ |
| 142 | SvREFCNT_inc(retval); /* for return to caller */ |
| 143 | /* XXX store in cache storage */ |
| 144 | return retval; |
| 145 | } |
| 146 | |
| 147 | STATIC I32 |
| 148 | __dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) { |
| 149 | I32 i; |
| 150 | for (i = startingblock; i >= 0; i--) { |
| 151 | if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i; |
| 152 | } |
| 153 | return i; |
| 154 | } |
| 155 | |
| 156 | STATIC SV* |
| 157 | __nextcan(pTHX_ SV* self, I32 throw_nomethod) |
| 158 | { |
| 159 | register I32 cxix; |
| 160 | register const PERL_CONTEXT *ccstack = cxstack; |
| 161 | const PERL_SI *top_si = PL_curstackinfo; |
| 162 | HV* selfstash; |
| 163 | GV* cvgv; |
| 164 | SV *stashname; |
| 165 | const char *fq_subname; |
| 166 | const char *subname; |
| 167 | STRLEN fq_subname_len; |
| 168 | STRLEN stashname_len; |
| 169 | STRLEN subname_len; |
| 170 | SV* sv; |
| 171 | GV** gvp; |
| 172 | AV* linear_av; |
| 173 | SV** linear_svp; |
| 174 | SV* linear_sv; |
| 175 | HV* cstash; |
| 176 | GV* candidate = NULL; |
| 177 | CV* cand_cv = NULL; |
| 178 | const char *hvname; |
| 179 | I32 items; |
| 180 | struct mro_meta* selfmeta; |
| 181 | HV* nmcache; |
| 182 | HE* cache_entry; |
| 183 | |
| 184 | if(sv_isobject(self)) |
| 185 | selfstash = SvSTASH(SvRV(self)); |
| 186 | else |
| 187 | selfstash = gv_stashsv(self, 0); |
| 188 | |
| 189 | assert(selfstash); |
| 190 | |
| 191 | hvname = HvNAME(selfstash); |
| 192 | if (!hvname) |
| 193 | croak("Can't use anonymous symbol table for method lookup"); |
| 194 | |
| 195 | cxix = __dopoptosub_at(cxstack, cxstack_ix); |
| 196 | |
| 197 | /* This block finds the contextually-enclosing fully-qualified subname, |
| 198 | much like looking at (caller($i))[3] until you find a real sub that |
| 199 | isn't ANON, etc */ |
| 200 | for (;;) { |
| 201 | /* we may be in a higher stacklevel, so dig down deeper */ |
| 202 | while (cxix < 0) { |
| 203 | if(top_si->si_type == PERLSI_MAIN) |
| 204 | croak("next::method/next::can/maybe::next::method must be used in method context"); |
| 205 | top_si = top_si->si_prev; |
| 206 | ccstack = top_si->si_cxstack; |
| 207 | cxix = __dopoptosub_at(ccstack, top_si->si_cxix); |
| 208 | } |
| 209 | |
| 210 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB |
| 211 | || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) { |
| 212 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
| 213 | continue; |
| 214 | } |
| 215 | |
| 216 | { |
| 217 | const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1); |
| 218 | if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) { |
| 219 | if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) { |
| 220 | cxix = dbcxix; |
| 221 | continue; |
| 222 | } |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | cvgv = CvGV(ccstack[cxix].blk_sub.cv); |
| 227 | |
| 228 | if(!isGV(cvgv)) { |
| 229 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
| 230 | continue; |
| 231 | } |
| 232 | |
| 233 | /* we found a real sub here */ |
| 234 | sv = sv_2mortal(newSV(0)); |
| 235 | |
| 236 | gv_efullname3(sv, cvgv, NULL); |
| 237 | |
| 238 | fq_subname = SvPVX(sv); |
| 239 | fq_subname_len = SvCUR(sv); |
| 240 | |
| 241 | subname = strrchr(fq_subname, ':'); |
| 242 | if(!subname) |
| 243 | croak("next::method/next::can/maybe::next::method cannot find enclosing method"); |
| 244 | |
| 245 | subname++; |
| 246 | subname_len = fq_subname_len - (subname - fq_subname); |
| 247 | if(subname_len == 8 && strEQ(subname, "__ANON__")) { |
| 248 | cxix = __dopoptosub_at(ccstack, cxix - 1); |
| 249 | continue; |
| 250 | } |
| 251 | break; |
| 252 | } |
| 253 | |
| 254 | /* If we made it to here, we found our context */ |
| 255 | |
| 256 | /* |
| 257 | XXX check %next::METHOD_CACHE |
| 258 | |
| 259 | selfmeta = HvMROMETA(selfstash); |
| 260 | if(!(nmcache = selfmeta->mro_nextmethod)) { |
| 261 | nmcache = selfmeta->mro_nextmethod = newHV(); |
| 262 | } |
| 263 | |
| 264 | if((cache_entry = hv_fetch_ent(nmcache, sv, 0, 0))) { |
| 265 | SV* val = HeVAL(cache_entry); |
| 266 | if(val == &PL_sv_undef) { |
| 267 | if(throw_nomethod) |
| 268 | croak("No next::method '%s' found for %s", subname, hvname); |
| 269 | return &PL_sv_undef; |
| 270 | } |
| 271 | return SvREFCNT_inc(val); |
| 272 | } |
| 273 | */ |
| 274 | |
| 275 | /* beyond here is just for cache misses, so perf isn't as critical */ |
| 276 | |
| 277 | stashname_len = subname - fq_subname - 2; |
| 278 | stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len)); |
| 279 | |
| 280 | linear_av = __mro_linear_isa_c3(selfstash, NULL, 0); /* has ourselves at the top of the list */ |
| 281 | sv_2mortal((SV*)linear_av); |
| 282 | |
| 283 | linear_svp = AvARRAY(linear_av); |
| 284 | items = AvFILLp(linear_av) + 1; |
| 285 | |
| 286 | while (items--) { |
| 287 | linear_sv = *linear_svp++; |
| 288 | assert(linear_sv); |
| 289 | if(sv_eq(linear_sv, stashname)) |
| 290 | break; |
| 291 | } |
| 292 | |
| 293 | if(items > 0) { |
| 294 | while (items--) { |
| 295 | linear_sv = *linear_svp++; |
| 296 | assert(linear_sv); |
| 297 | cstash = gv_stashsv(linear_sv, FALSE); |
| 298 | |
| 299 | if (!cstash) { |
| 300 | if (ckWARN(WARN_MISC)) |
| 301 | Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA", |
| 302 | (void*)linear_sv, hvname); |
| 303 | continue; |
| 304 | } |
| 305 | |
| 306 | assert(cstash); |
| 307 | |
| 308 | /* XXX we need to fetch from %Class::C3::MRO, not the real stash table */ |
| 309 | |
| 310 | gvp = (GV**)hv_fetch(cstash, subname, subname_len, 0); |
| 311 | if (!gvp) continue; |
| 312 | |
| 313 | candidate = *gvp; |
| 314 | assert(candidate); |
| 315 | |
| 316 | if (SvTYPE(candidate) != SVt_PVGV) |
| 317 | gv_init(candidate, cstash, subname, subname_len, TRUE); |
| 318 | if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { |
| 319 | SvREFCNT_inc((SV*)cand_cv); |
| 320 | /* XXX store result in cache */ |
| 321 | /* hv_store_ent(nmcache, newSVsv(sv), (SV*)cand_cv, 0); */ |
| 322 | return (SV*)cand_cv; |
| 323 | } |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | /* XXX store undef in cache */ |
| 328 | /* hv_store_ent(nmcache, newSVsv(sv), &PL_sv_undef, 0); */ |
| 329 | if(throw_nomethod) |
| 330 | croak("No next::method '%s' found for %s", subname, hvname); |
| 331 | return &PL_sv_undef; |
| 332 | } |
| 333 | |
| 334 | XS(XS_Class_C3_XS_calculateMRO); |
| 335 | XS(XS_Class_C3_XS_calculateMRO) |
| 336 | { |
| 337 | #ifdef dVAR |
| 338 | dVAR; dXSARGS; |
| 339 | #else |
| 340 | dXSARGS; |
| 341 | #endif |
| 342 | |
| 343 | SV* classname; |
| 344 | HV* class_stash; |
| 345 | HV* cache = NULL; |
| 346 | AV* res; |
| 347 | I32 res_items; |
| 348 | I32 ret_items; |
| 349 | SV** res_ptr; |
| 350 | |
| 351 | if(items < 1 || items > 2) |
| 352 | croak("Usage: calculateMRO(classname[, cache])"); |
| 353 | |
| 354 | classname = ST(0); |
| 355 | if(items == 2) cache = (HV*)ST(1); |
| 356 | |
| 357 | class_stash = gv_stashsv(classname, 0); |
| 358 | if(!class_stash) croak("No such class: '%s'!", SvPV_nolen(classname)); |
| 359 | |
| 360 | res = (AV*)sv_2mortal((SV*)__mro_linear_isa_c3(class_stash, cache, 0)); |
| 361 | |
| 362 | |
| 363 | res_items = ret_items = AvFILLp(res) + 1; |
| 364 | res_ptr = AvARRAY(res); |
| 365 | |
| 366 | SP -= items; |
| 367 | |
| 368 | while(res_items--) { |
| 369 | SV* res_item = *res_ptr++; |
| 370 | XPUSHs(res_item); |
| 371 | } |
| 372 | |
| 373 | PUTBACK; |
| 374 | |
| 375 | return; |
| 376 | } |
| 377 | |
| 378 | XS(XS_next_can); |
| 379 | XS(XS_next_can) |
| 380 | { |
| 381 | #ifdef dVAR |
| 382 | dVAR; dXSARGS; |
| 383 | #else |
| 384 | dXSARGS; |
| 385 | #endif |
| 386 | |
| 387 | SV* self = ST(0); |
| 388 | SV* methcv = __nextcan(self, 0); |
| 389 | |
| 390 | PERL_UNUSED_VAR(items); |
| 391 | |
| 392 | if(methcv == &PL_sv_undef) { |
| 393 | ST(0) = &PL_sv_undef; |
| 394 | } |
| 395 | else { |
| 396 | ST(0) = sv_2mortal(newRV_inc(methcv)); |
| 397 | } |
| 398 | |
| 399 | XSRETURN(1); |
| 400 | } |
| 401 | |
| 402 | XS(XS_next_method); |
| 403 | XS(XS_next_method) |
| 404 | { |
| 405 | dMARK; |
| 406 | dAX; |
| 407 | SV* self = ST(0); |
| 408 | SV* methcv = __nextcan(self, 1); |
| 409 | |
| 410 | PL_markstack_ptr++; |
| 411 | call_sv(methcv, GIMME_V); |
| 412 | } |
| 413 | |
| 414 | XS(XS_maybe_next_method); |
| 415 | XS(XS_maybe_next_method) |
| 416 | { |
| 417 | dMARK; |
| 418 | dAX; |
| 419 | SV* self = ST(0); |
| 420 | SV* methcv = __nextcan(self, 0); |
| 421 | |
| 422 | if(methcv == &PL_sv_undef) { |
| 423 | ST(0) = &PL_sv_undef; |
| 424 | XSRETURN(1); |
| 425 | } |
| 426 | |
| 427 | PL_markstack_ptr++; |
| 428 | call_sv(methcv, GIMME_V); |
| 429 | } |
| 430 | |
| 431 | MODULE = Class::C3::XS PACKAGE = Class::C3::XS |
| 432 | |
| 433 | BOOT: |
| 434 | newXS("Class::C3::XS::calculateMRO", XS_Class_C3_XS_calculateMRO, __FILE__); |
| 435 | newXS("next::can", XS_next_can, __FILE__); |
| 436 | newXS("next::method", XS_next_method, __FILE__); |
| 437 | newXS("maybe::next::method", XS_maybe_next_method, __FILE__); |
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