| 1 | /* hv.c |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
| 4 | * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others |
| 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 | /* |
| 12 | * I sit beside the fire and think |
| 13 | * of all that I have seen. |
| 14 | * --Bilbo |
| 15 | * |
| 16 | * [p.278 of _The Lord of the Rings_, II/iii: "The Ring Goes South"] |
| 17 | */ |
| 18 | |
| 19 | /* |
| 20 | =head1 Hash Manipulation Functions |
| 21 | |
| 22 | A HV structure represents a Perl hash. It consists mainly of an array |
| 23 | of pointers, each of which points to a linked list of HE structures. The |
| 24 | array is indexed by the hash function of the key, so each linked list |
| 25 | represents all the hash entries with the same hash value. Each HE contains |
| 26 | a pointer to the actual value, plus a pointer to a HEK structure which |
| 27 | holds the key and hash value. |
| 28 | |
| 29 | =cut |
| 30 | |
| 31 | */ |
| 32 | |
| 33 | #include "EXTERN.h" |
| 34 | #define PERL_IN_HV_C |
| 35 | #define PERL_HASH_INTERNAL_ACCESS |
| 36 | #include "perl.h" |
| 37 | |
| 38 | #define HV_MAX_LENGTH_BEFORE_SPLIT 14 |
| 39 | |
| 40 | static const char S_strtab_error[] |
| 41 | = "Cannot modify shared string table in hv_%s"; |
| 42 | |
| 43 | #ifdef PURIFY |
| 44 | |
| 45 | #define new_HE() (HE*)safemalloc(sizeof(HE)) |
| 46 | #define del_HE(p) safefree((char*)p) |
| 47 | |
| 48 | #else |
| 49 | |
| 50 | STATIC HE* |
| 51 | S_new_he(pTHX) |
| 52 | { |
| 53 | dVAR; |
| 54 | HE* he; |
| 55 | void ** const root = &PL_body_roots[HE_SVSLOT]; |
| 56 | |
| 57 | if (!*root) |
| 58 | Perl_more_bodies(aTHX_ HE_SVSLOT, sizeof(HE), PERL_ARENA_SIZE); |
| 59 | he = (HE*) *root; |
| 60 | assert(he); |
| 61 | *root = HeNEXT(he); |
| 62 | return he; |
| 63 | } |
| 64 | |
| 65 | #define new_HE() new_he() |
| 66 | #define del_HE(p) \ |
| 67 | STMT_START { \ |
| 68 | HeNEXT(p) = (HE*)(PL_body_roots[HE_SVSLOT]); \ |
| 69 | PL_body_roots[HE_SVSLOT] = p; \ |
| 70 | } STMT_END |
| 71 | |
| 72 | |
| 73 | |
| 74 | #endif |
| 75 | |
| 76 | STATIC HEK * |
| 77 | S_save_hek_flags(const char *str, I32 len, U32 hash, int flags) |
| 78 | { |
| 79 | const int flags_masked = flags & HVhek_MASK; |
| 80 | char *k; |
| 81 | register HEK *hek; |
| 82 | |
| 83 | PERL_ARGS_ASSERT_SAVE_HEK_FLAGS; |
| 84 | |
| 85 | Newx(k, HEK_BASESIZE + len + 2, char); |
| 86 | hek = (HEK*)k; |
| 87 | Copy(str, HEK_KEY(hek), len, char); |
| 88 | HEK_KEY(hek)[len] = 0; |
| 89 | HEK_LEN(hek) = len; |
| 90 | HEK_HASH(hek) = hash; |
| 91 | HEK_FLAGS(hek) = (unsigned char)flags_masked | HVhek_UNSHARED; |
| 92 | |
| 93 | if (flags & HVhek_FREEKEY) |
| 94 | Safefree(str); |
| 95 | return hek; |
| 96 | } |
| 97 | |
| 98 | /* free the pool of temporary HE/HEK pairs returned by hv_fetch_ent |
| 99 | * for tied hashes */ |
| 100 | |
| 101 | void |
| 102 | Perl_free_tied_hv_pool(pTHX) |
| 103 | { |
| 104 | dVAR; |
| 105 | HE *he = PL_hv_fetch_ent_mh; |
| 106 | while (he) { |
| 107 | HE * const ohe = he; |
| 108 | Safefree(HeKEY_hek(he)); |
| 109 | he = HeNEXT(he); |
| 110 | del_HE(ohe); |
| 111 | } |
| 112 | PL_hv_fetch_ent_mh = NULL; |
| 113 | } |
| 114 | |
| 115 | #if defined(USE_ITHREADS) |
| 116 | HEK * |
| 117 | Perl_hek_dup(pTHX_ HEK *source, CLONE_PARAMS* param) |
| 118 | { |
| 119 | HEK *shared; |
| 120 | |
| 121 | PERL_ARGS_ASSERT_HEK_DUP; |
| 122 | PERL_UNUSED_ARG(param); |
| 123 | |
| 124 | if (!source) |
| 125 | return NULL; |
| 126 | |
| 127 | shared = (HEK*)ptr_table_fetch(PL_ptr_table, source); |
| 128 | if (shared) { |
| 129 | /* We already shared this hash key. */ |
| 130 | (void)share_hek_hek(shared); |
| 131 | } |
| 132 | else { |
| 133 | shared |
| 134 | = share_hek_flags(HEK_KEY(source), HEK_LEN(source), |
| 135 | HEK_HASH(source), HEK_FLAGS(source)); |
| 136 | ptr_table_store(PL_ptr_table, source, shared); |
| 137 | } |
| 138 | return shared; |
| 139 | } |
| 140 | |
| 141 | HE * |
| 142 | Perl_he_dup(pTHX_ const HE *e, bool shared, CLONE_PARAMS* param) |
| 143 | { |
| 144 | HE *ret; |
| 145 | |
| 146 | PERL_ARGS_ASSERT_HE_DUP; |
| 147 | |
| 148 | if (!e) |
| 149 | return NULL; |
| 150 | /* look for it in the table first */ |
| 151 | ret = (HE*)ptr_table_fetch(PL_ptr_table, e); |
| 152 | if (ret) |
| 153 | return ret; |
| 154 | |
| 155 | /* create anew and remember what it is */ |
| 156 | ret = new_HE(); |
| 157 | ptr_table_store(PL_ptr_table, e, ret); |
| 158 | |
| 159 | HeNEXT(ret) = he_dup(HeNEXT(e),shared, param); |
| 160 | if (HeKLEN(e) == HEf_SVKEY) { |
| 161 | char *k; |
| 162 | Newx(k, HEK_BASESIZE + sizeof(const SV *), char); |
| 163 | HeKEY_hek(ret) = (HEK*)k; |
| 164 | HeKEY_sv(ret) = sv_dup_inc(HeKEY_sv(e), param); |
| 165 | } |
| 166 | else if (shared) { |
| 167 | /* This is hek_dup inlined, which seems to be important for speed |
| 168 | reasons. */ |
| 169 | HEK * const source = HeKEY_hek(e); |
| 170 | HEK *shared = (HEK*)ptr_table_fetch(PL_ptr_table, source); |
| 171 | |
| 172 | if (shared) { |
| 173 | /* We already shared this hash key. */ |
| 174 | (void)share_hek_hek(shared); |
| 175 | } |
| 176 | else { |
| 177 | shared |
| 178 | = share_hek_flags(HEK_KEY(source), HEK_LEN(source), |
| 179 | HEK_HASH(source), HEK_FLAGS(source)); |
| 180 | ptr_table_store(PL_ptr_table, source, shared); |
| 181 | } |
| 182 | HeKEY_hek(ret) = shared; |
| 183 | } |
| 184 | else |
| 185 | HeKEY_hek(ret) = save_hek_flags(HeKEY(e), HeKLEN(e), HeHASH(e), |
| 186 | HeKFLAGS(e)); |
| 187 | HeVAL(ret) = sv_dup_inc(HeVAL(e), param); |
| 188 | return ret; |
| 189 | } |
| 190 | #endif /* USE_ITHREADS */ |
| 191 | |
| 192 | static void |
| 193 | S_hv_notallowed(pTHX_ int flags, const char *key, I32 klen, |
| 194 | const char *msg) |
| 195 | { |
| 196 | SV * const sv = sv_newmortal(); |
| 197 | |
| 198 | PERL_ARGS_ASSERT_HV_NOTALLOWED; |
| 199 | |
| 200 | if (!(flags & HVhek_FREEKEY)) { |
| 201 | sv_setpvn(sv, key, klen); |
| 202 | } |
| 203 | else { |
| 204 | /* Need to free saved eventually assign to mortal SV */ |
| 205 | /* XXX is this line an error ???: SV *sv = sv_newmortal(); */ |
| 206 | sv_usepvn(sv, (char *) key, klen); |
| 207 | } |
| 208 | if (flags & HVhek_UTF8) { |
| 209 | SvUTF8_on(sv); |
| 210 | } |
| 211 | Perl_croak(aTHX_ msg, SVfARG(sv)); |
| 212 | } |
| 213 | |
| 214 | /* (klen == HEf_SVKEY) is special for MAGICAL hv entries, meaning key slot |
| 215 | * contains an SV* */ |
| 216 | |
| 217 | /* |
| 218 | =for apidoc hv_store |
| 219 | |
| 220 | Stores an SV in a hash. The hash key is specified as C<key> and C<klen> is |
| 221 | the length of the key. The C<hash> parameter is the precomputed hash |
| 222 | value; if it is zero then Perl will compute it. The return value will be |
| 223 | NULL if the operation failed or if the value did not need to be actually |
| 224 | stored within the hash (as in the case of tied hashes). Otherwise it can |
| 225 | be dereferenced to get the original C<SV*>. Note that the caller is |
| 226 | responsible for suitably incrementing the reference count of C<val> before |
| 227 | the call, and decrementing it if the function returned NULL. Effectively |
| 228 | a successful hv_store takes ownership of one reference to C<val>. This is |
| 229 | usually what you want; a newly created SV has a reference count of one, so |
| 230 | if all your code does is create SVs then store them in a hash, hv_store |
| 231 | will own the only reference to the new SV, and your code doesn't need to do |
| 232 | anything further to tidy up. hv_store is not implemented as a call to |
| 233 | hv_store_ent, and does not create a temporary SV for the key, so if your |
| 234 | key data is not already in SV form then use hv_store in preference to |
| 235 | hv_store_ent. |
| 236 | |
| 237 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
| 238 | information on how to use this function on tied hashes. |
| 239 | |
| 240 | =for apidoc hv_store_ent |
| 241 | |
| 242 | Stores C<val> in a hash. The hash key is specified as C<key>. The C<hash> |
| 243 | parameter is the precomputed hash value; if it is zero then Perl will |
| 244 | compute it. The return value is the new hash entry so created. It will be |
| 245 | NULL if the operation failed or if the value did not need to be actually |
| 246 | stored within the hash (as in the case of tied hashes). Otherwise the |
| 247 | contents of the return value can be accessed using the C<He?> macros |
| 248 | described here. Note that the caller is responsible for suitably |
| 249 | incrementing the reference count of C<val> before the call, and |
| 250 | decrementing it if the function returned NULL. Effectively a successful |
| 251 | hv_store_ent takes ownership of one reference to C<val>. This is |
| 252 | usually what you want; a newly created SV has a reference count of one, so |
| 253 | if all your code does is create SVs then store them in a hash, hv_store |
| 254 | will own the only reference to the new SV, and your code doesn't need to do |
| 255 | anything further to tidy up. Note that hv_store_ent only reads the C<key>; |
| 256 | unlike C<val> it does not take ownership of it, so maintaining the correct |
| 257 | reference count on C<key> is entirely the caller's responsibility. hv_store |
| 258 | is not implemented as a call to hv_store_ent, and does not create a temporary |
| 259 | SV for the key, so if your key data is not already in SV form then use |
| 260 | hv_store in preference to hv_store_ent. |
| 261 | |
| 262 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
| 263 | information on how to use this function on tied hashes. |
| 264 | |
| 265 | =for apidoc hv_exists |
| 266 | |
| 267 | Returns a boolean indicating whether the specified hash key exists. The |
| 268 | C<klen> is the length of the key. |
| 269 | |
| 270 | =for apidoc hv_fetch |
| 271 | |
| 272 | Returns the SV which corresponds to the specified key in the hash. The |
| 273 | C<klen> is the length of the key. If C<lval> is set then the fetch will be |
| 274 | part of a store. Check that the return value is non-null before |
| 275 | dereferencing it to an C<SV*>. |
| 276 | |
| 277 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
| 278 | information on how to use this function on tied hashes. |
| 279 | |
| 280 | =for apidoc hv_exists_ent |
| 281 | |
| 282 | Returns a boolean indicating whether the specified hash key exists. C<hash> |
| 283 | can be a valid precomputed hash value, or 0 to ask for it to be |
| 284 | computed. |
| 285 | |
| 286 | =cut |
| 287 | */ |
| 288 | |
| 289 | /* returns an HE * structure with the all fields set */ |
| 290 | /* note that hent_val will be a mortal sv for MAGICAL hashes */ |
| 291 | /* |
| 292 | =for apidoc hv_fetch_ent |
| 293 | |
| 294 | Returns the hash entry which corresponds to the specified key in the hash. |
| 295 | C<hash> must be a valid precomputed hash number for the given C<key>, or 0 |
| 296 | if you want the function to compute it. IF C<lval> is set then the fetch |
| 297 | will be part of a store. Make sure the return value is non-null before |
| 298 | accessing it. The return value when C<hv> is a tied hash is a pointer to a |
| 299 | static location, so be sure to make a copy of the structure if you need to |
| 300 | store it somewhere. |
| 301 | |
| 302 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
| 303 | information on how to use this function on tied hashes. |
| 304 | |
| 305 | =cut |
| 306 | */ |
| 307 | |
| 308 | /* Common code for hv_delete()/hv_exists()/hv_fetch()/hv_store() */ |
| 309 | void * |
| 310 | Perl_hv_common_key_len(pTHX_ HV *hv, const char *key, I32 klen_i32, |
| 311 | const int action, SV *val, const U32 hash) |
| 312 | { |
| 313 | STRLEN klen; |
| 314 | int flags; |
| 315 | |
| 316 | PERL_ARGS_ASSERT_HV_COMMON_KEY_LEN; |
| 317 | |
| 318 | if (klen_i32 < 0) { |
| 319 | klen = -klen_i32; |
| 320 | flags = HVhek_UTF8; |
| 321 | } else { |
| 322 | klen = klen_i32; |
| 323 | flags = 0; |
| 324 | } |
| 325 | return hv_common(hv, NULL, key, klen, flags, action, val, hash); |
| 326 | } |
| 327 | |
| 328 | void * |
| 329 | Perl_hv_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen, |
| 330 | int flags, int action, SV *val, register U32 hash) |
| 331 | { |
| 332 | dVAR; |
| 333 | XPVHV* xhv; |
| 334 | HE *entry; |
| 335 | HE **oentry; |
| 336 | SV *sv; |
| 337 | bool is_utf8; |
| 338 | int masked_flags; |
| 339 | const int return_svp = action & HV_FETCH_JUST_SV; |
| 340 | |
| 341 | if (!hv) |
| 342 | return NULL; |
| 343 | if (SvTYPE(hv) == SVTYPEMASK) |
| 344 | return NULL; |
| 345 | |
| 346 | assert(SvTYPE(hv) == SVt_PVHV); |
| 347 | |
| 348 | if (SvSMAGICAL(hv) && SvGMAGICAL(hv) && !(action & HV_DISABLE_UVAR_XKEY)) { |
| 349 | MAGIC* mg; |
| 350 | if ((mg = mg_find((const SV *)hv, PERL_MAGIC_uvar))) { |
| 351 | struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr; |
| 352 | if (uf->uf_set == NULL) { |
| 353 | SV* obj = mg->mg_obj; |
| 354 | |
| 355 | if (!keysv) { |
| 356 | keysv = newSVpvn_flags(key, klen, SVs_TEMP | |
| 357 | ((flags & HVhek_UTF8) |
| 358 | ? SVf_UTF8 : 0)); |
| 359 | } |
| 360 | |
| 361 | mg->mg_obj = keysv; /* pass key */ |
| 362 | uf->uf_index = action; /* pass action */ |
| 363 | magic_getuvar(MUTABLE_SV(hv), mg); |
| 364 | keysv = mg->mg_obj; /* may have changed */ |
| 365 | mg->mg_obj = obj; |
| 366 | |
| 367 | /* If the key may have changed, then we need to invalidate |
| 368 | any passed-in computed hash value. */ |
| 369 | hash = 0; |
| 370 | } |
| 371 | } |
| 372 | } |
| 373 | if (keysv) { |
| 374 | if (flags & HVhek_FREEKEY) |
| 375 | Safefree(key); |
| 376 | key = SvPV_const(keysv, klen); |
| 377 | is_utf8 = (SvUTF8(keysv) != 0); |
| 378 | if (SvIsCOW_shared_hash(keysv)) { |
| 379 | flags = HVhek_KEYCANONICAL | (is_utf8 ? HVhek_UTF8 : 0); |
| 380 | } else { |
| 381 | flags = 0; |
| 382 | } |
| 383 | } else { |
| 384 | is_utf8 = ((flags & HVhek_UTF8) ? TRUE : FALSE); |
| 385 | } |
| 386 | |
| 387 | if (action & HV_DELETE) { |
| 388 | return (void *) hv_delete_common(hv, keysv, key, klen, |
| 389 | flags | (is_utf8 ? HVhek_UTF8 : 0), |
| 390 | action, hash); |
| 391 | } |
| 392 | |
| 393 | xhv = (XPVHV*)SvANY(hv); |
| 394 | if (SvMAGICAL(hv)) { |
| 395 | if (SvRMAGICAL(hv) && !(action & (HV_FETCH_ISSTORE|HV_FETCH_ISEXISTS))) { |
| 396 | if (mg_find((const SV *)hv, PERL_MAGIC_tied) |
| 397 | || SvGMAGICAL((const SV *)hv)) |
| 398 | { |
| 399 | /* FIXME should be able to skimp on the HE/HEK here when |
| 400 | HV_FETCH_JUST_SV is true. */ |
| 401 | if (!keysv) { |
| 402 | keysv = newSVpvn_utf8(key, klen, is_utf8); |
| 403 | } else { |
| 404 | keysv = newSVsv(keysv); |
| 405 | } |
| 406 | sv = sv_newmortal(); |
| 407 | mg_copy(MUTABLE_SV(hv), sv, (char *)keysv, HEf_SVKEY); |
| 408 | |
| 409 | /* grab a fake HE/HEK pair from the pool or make a new one */ |
| 410 | entry = PL_hv_fetch_ent_mh; |
| 411 | if (entry) |
| 412 | PL_hv_fetch_ent_mh = HeNEXT(entry); |
| 413 | else { |
| 414 | char *k; |
| 415 | entry = new_HE(); |
| 416 | Newx(k, HEK_BASESIZE + sizeof(const SV *), char); |
| 417 | HeKEY_hek(entry) = (HEK*)k; |
| 418 | } |
| 419 | HeNEXT(entry) = NULL; |
| 420 | HeSVKEY_set(entry, keysv); |
| 421 | HeVAL(entry) = sv; |
| 422 | sv_upgrade(sv, SVt_PVLV); |
| 423 | LvTYPE(sv) = 'T'; |
| 424 | /* so we can free entry when freeing sv */ |
| 425 | LvTARG(sv) = MUTABLE_SV(entry); |
| 426 | |
| 427 | /* XXX remove at some point? */ |
| 428 | if (flags & HVhek_FREEKEY) |
| 429 | Safefree(key); |
| 430 | |
| 431 | if (return_svp) { |
| 432 | return entry ? (void *) &HeVAL(entry) : NULL; |
| 433 | } |
| 434 | return (void *) entry; |
| 435 | } |
| 436 | #ifdef ENV_IS_CASELESS |
| 437 | else if (mg_find((const SV *)hv, PERL_MAGIC_env)) { |
| 438 | U32 i; |
| 439 | for (i = 0; i < klen; ++i) |
| 440 | if (isLOWER(key[i])) { |
| 441 | /* Would be nice if we had a routine to do the |
| 442 | copy and upercase in a single pass through. */ |
| 443 | const char * const nkey = strupr(savepvn(key,klen)); |
| 444 | /* Note that this fetch is for nkey (the uppercased |
| 445 | key) whereas the store is for key (the original) */ |
| 446 | void *result = hv_common(hv, NULL, nkey, klen, |
| 447 | HVhek_FREEKEY, /* free nkey */ |
| 448 | 0 /* non-LVAL fetch */ |
| 449 | | HV_DISABLE_UVAR_XKEY |
| 450 | | return_svp, |
| 451 | NULL /* no value */, |
| 452 | 0 /* compute hash */); |
| 453 | if (!result && (action & HV_FETCH_LVALUE)) { |
| 454 | /* This call will free key if necessary. |
| 455 | Do it this way to encourage compiler to tail |
| 456 | call optimise. */ |
| 457 | result = hv_common(hv, keysv, key, klen, flags, |
| 458 | HV_FETCH_ISSTORE |
| 459 | | HV_DISABLE_UVAR_XKEY |
| 460 | | return_svp, |
| 461 | newSV(0), hash); |
| 462 | } else { |
| 463 | if (flags & HVhek_FREEKEY) |
| 464 | Safefree(key); |
| 465 | } |
| 466 | return result; |
| 467 | } |
| 468 | } |
| 469 | #endif |
| 470 | } /* ISFETCH */ |
| 471 | else if (SvRMAGICAL(hv) && (action & HV_FETCH_ISEXISTS)) { |
| 472 | if (mg_find((const SV *)hv, PERL_MAGIC_tied) |
| 473 | || SvGMAGICAL((const SV *)hv)) { |
| 474 | /* I don't understand why hv_exists_ent has svret and sv, |
| 475 | whereas hv_exists only had one. */ |
| 476 | SV * const svret = sv_newmortal(); |
| 477 | sv = sv_newmortal(); |
| 478 | |
| 479 | if (keysv || is_utf8) { |
| 480 | if (!keysv) { |
| 481 | keysv = newSVpvn_utf8(key, klen, TRUE); |
| 482 | } else { |
| 483 | keysv = newSVsv(keysv); |
| 484 | } |
| 485 | mg_copy(MUTABLE_SV(hv), sv, (char *)sv_2mortal(keysv), HEf_SVKEY); |
| 486 | } else { |
| 487 | mg_copy(MUTABLE_SV(hv), sv, key, klen); |
| 488 | } |
| 489 | if (flags & HVhek_FREEKEY) |
| 490 | Safefree(key); |
| 491 | magic_existspack(svret, mg_find(sv, PERL_MAGIC_tiedelem)); |
| 492 | /* This cast somewhat evil, but I'm merely using NULL/ |
| 493 | not NULL to return the boolean exists. |
| 494 | And I know hv is not NULL. */ |
| 495 | return SvTRUE(svret) ? (void *)hv : NULL; |
| 496 | } |
| 497 | #ifdef ENV_IS_CASELESS |
| 498 | else if (mg_find((const SV *)hv, PERL_MAGIC_env)) { |
| 499 | /* XXX This code isn't UTF8 clean. */ |
| 500 | char * const keysave = (char * const)key; |
| 501 | /* Will need to free this, so set FREEKEY flag. */ |
| 502 | key = savepvn(key,klen); |
| 503 | key = (const char*)strupr((char*)key); |
| 504 | is_utf8 = FALSE; |
| 505 | hash = 0; |
| 506 | keysv = 0; |
| 507 | |
| 508 | if (flags & HVhek_FREEKEY) { |
| 509 | Safefree(keysave); |
| 510 | } |
| 511 | flags |= HVhek_FREEKEY; |
| 512 | } |
| 513 | #endif |
| 514 | } /* ISEXISTS */ |
| 515 | else if (action & HV_FETCH_ISSTORE) { |
| 516 | bool needs_copy; |
| 517 | bool needs_store; |
| 518 | hv_magic_check (hv, &needs_copy, &needs_store); |
| 519 | if (needs_copy) { |
| 520 | const bool save_taint = PL_tainted; |
| 521 | if (keysv || is_utf8) { |
| 522 | if (!keysv) { |
| 523 | keysv = newSVpvn_utf8(key, klen, TRUE); |
| 524 | } |
| 525 | if (PL_tainting) |
| 526 | PL_tainted = SvTAINTED(keysv); |
| 527 | keysv = sv_2mortal(newSVsv(keysv)); |
| 528 | mg_copy(MUTABLE_SV(hv), val, (char*)keysv, HEf_SVKEY); |
| 529 | } else { |
| 530 | mg_copy(MUTABLE_SV(hv), val, key, klen); |
| 531 | } |
| 532 | |
| 533 | TAINT_IF(save_taint); |
| 534 | if (!needs_store) { |
| 535 | if (flags & HVhek_FREEKEY) |
| 536 | Safefree(key); |
| 537 | return NULL; |
| 538 | } |
| 539 | #ifdef ENV_IS_CASELESS |
| 540 | else if (mg_find((const SV *)hv, PERL_MAGIC_env)) { |
| 541 | /* XXX This code isn't UTF8 clean. */ |
| 542 | const char *keysave = key; |
| 543 | /* Will need to free this, so set FREEKEY flag. */ |
| 544 | key = savepvn(key,klen); |
| 545 | key = (const char*)strupr((char*)key); |
| 546 | is_utf8 = FALSE; |
| 547 | hash = 0; |
| 548 | keysv = 0; |
| 549 | |
| 550 | if (flags & HVhek_FREEKEY) { |
| 551 | Safefree(keysave); |
| 552 | } |
| 553 | flags |= HVhek_FREEKEY; |
| 554 | } |
| 555 | #endif |
| 556 | } |
| 557 | } /* ISSTORE */ |
| 558 | } /* SvMAGICAL */ |
| 559 | |
| 560 | if (!HvARRAY(hv)) { |
| 561 | if ((action & (HV_FETCH_LVALUE | HV_FETCH_ISSTORE)) |
| 562 | #ifdef DYNAMIC_ENV_FETCH /* if it's an %ENV lookup, we may get it on the fly */ |
| 563 | || (SvRMAGICAL((const SV *)hv) |
| 564 | && mg_find((const SV *)hv, PERL_MAGIC_env)) |
| 565 | #endif |
| 566 | ) { |
| 567 | char *array; |
| 568 | Newxz(array, |
| 569 | PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */), |
| 570 | char); |
| 571 | HvARRAY(hv) = (HE**)array; |
| 572 | } |
| 573 | #ifdef DYNAMIC_ENV_FETCH |
| 574 | else if (action & HV_FETCH_ISEXISTS) { |
| 575 | /* for an %ENV exists, if we do an insert it's by a recursive |
| 576 | store call, so avoid creating HvARRAY(hv) right now. */ |
| 577 | } |
| 578 | #endif |
| 579 | else { |
| 580 | /* XXX remove at some point? */ |
| 581 | if (flags & HVhek_FREEKEY) |
| 582 | Safefree(key); |
| 583 | |
| 584 | return NULL; |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | if (is_utf8 & !(flags & HVhek_KEYCANONICAL)) { |
| 589 | char * const keysave = (char *)key; |
| 590 | key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8); |
| 591 | if (is_utf8) |
| 592 | flags |= HVhek_UTF8; |
| 593 | else |
| 594 | flags &= ~HVhek_UTF8; |
| 595 | if (key != keysave) { |
| 596 | if (flags & HVhek_FREEKEY) |
| 597 | Safefree(keysave); |
| 598 | flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
| 599 | /* If the caller calculated a hash, it was on the sequence of |
| 600 | octets that are the UTF-8 form. We've now changed the sequence |
| 601 | of octets stored to that of the equivalent byte representation, |
| 602 | so the hash we need is different. */ |
| 603 | hash = 0; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | if (HvREHASH(hv) || (!hash && !(keysv && (SvIsCOW_shared_hash(keysv))))) |
| 608 | PERL_HASH_INTERNAL_(hash, key, klen, HvREHASH(hv)); |
| 609 | else if (!hash) |
| 610 | hash = SvSHARED_HASH(keysv); |
| 611 | |
| 612 | /* We don't have a pointer to the hv, so we have to replicate the |
| 613 | flag into every HEK, so that hv_iterkeysv can see it. |
| 614 | And yes, you do need this even though you are not "storing" because |
| 615 | you can flip the flags below if doing an lval lookup. (And that |
| 616 | was put in to give the semantics Andreas was expecting.) */ |
| 617 | if (HvREHASH(hv)) |
| 618 | flags |= HVhek_REHASH; |
| 619 | |
| 620 | masked_flags = (flags & HVhek_MASK); |
| 621 | |
| 622 | #ifdef DYNAMIC_ENV_FETCH |
| 623 | if (!HvARRAY(hv)) entry = NULL; |
| 624 | else |
| 625 | #endif |
| 626 | { |
| 627 | entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)]; |
| 628 | } |
| 629 | for (; entry; entry = HeNEXT(entry)) { |
| 630 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
| 631 | continue; |
| 632 | if (HeKLEN(entry) != (I32)klen) |
| 633 | continue; |
| 634 | if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */ |
| 635 | continue; |
| 636 | if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8) |
| 637 | continue; |
| 638 | |
| 639 | if (action & (HV_FETCH_LVALUE|HV_FETCH_ISSTORE)) { |
| 640 | if (HeKFLAGS(entry) != masked_flags) { |
| 641 | /* We match if HVhek_UTF8 bit in our flags and hash key's |
| 642 | match. But if entry was set previously with HVhek_WASUTF8 |
| 643 | and key now doesn't (or vice versa) then we should change |
| 644 | the key's flag, as this is assignment. */ |
| 645 | if (HvSHAREKEYS(hv)) { |
| 646 | /* Need to swap the key we have for a key with the flags we |
| 647 | need. As keys are shared we can't just write to the |
| 648 | flag, so we share the new one, unshare the old one. */ |
| 649 | HEK * const new_hek = share_hek_flags(key, klen, hash, |
| 650 | masked_flags); |
| 651 | unshare_hek (HeKEY_hek(entry)); |
| 652 | HeKEY_hek(entry) = new_hek; |
| 653 | } |
| 654 | else if (hv == PL_strtab) { |
| 655 | /* PL_strtab is usually the only hash without HvSHAREKEYS, |
| 656 | so putting this test here is cheap */ |
| 657 | if (flags & HVhek_FREEKEY) |
| 658 | Safefree(key); |
| 659 | Perl_croak(aTHX_ S_strtab_error, |
| 660 | action & HV_FETCH_LVALUE ? "fetch" : "store"); |
| 661 | } |
| 662 | else |
| 663 | HeKFLAGS(entry) = masked_flags; |
| 664 | if (masked_flags & HVhek_ENABLEHVKFLAGS) |
| 665 | HvHASKFLAGS_on(hv); |
| 666 | } |
| 667 | if (HeVAL(entry) == &PL_sv_placeholder) { |
| 668 | /* yes, can store into placeholder slot */ |
| 669 | if (action & HV_FETCH_LVALUE) { |
| 670 | if (SvMAGICAL(hv)) { |
| 671 | /* This preserves behaviour with the old hv_fetch |
| 672 | implementation which at this point would bail out |
| 673 | with a break; (at "if we find a placeholder, we |
| 674 | pretend we haven't found anything") |
| 675 | |
| 676 | That break mean that if a placeholder were found, it |
| 677 | caused a call into hv_store, which in turn would |
| 678 | check magic, and if there is no magic end up pretty |
| 679 | much back at this point (in hv_store's code). */ |
| 680 | break; |
| 681 | } |
| 682 | /* LVAL fetch which actually needs a store. */ |
| 683 | val = newSV(0); |
| 684 | HvPLACEHOLDERS(hv)--; |
| 685 | } else { |
| 686 | /* store */ |
| 687 | if (val != &PL_sv_placeholder) |
| 688 | HvPLACEHOLDERS(hv)--; |
| 689 | } |
| 690 | HeVAL(entry) = val; |
| 691 | } else if (action & HV_FETCH_ISSTORE) { |
| 692 | SvREFCNT_dec(HeVAL(entry)); |
| 693 | HeVAL(entry) = val; |
| 694 | } |
| 695 | } else if (HeVAL(entry) == &PL_sv_placeholder) { |
| 696 | /* if we find a placeholder, we pretend we haven't found |
| 697 | anything */ |
| 698 | break; |
| 699 | } |
| 700 | if (flags & HVhek_FREEKEY) |
| 701 | Safefree(key); |
| 702 | if (return_svp) { |
| 703 | return entry ? (void *) &HeVAL(entry) : NULL; |
| 704 | } |
| 705 | return entry; |
| 706 | } |
| 707 | #ifdef DYNAMIC_ENV_FETCH /* %ENV lookup? If so, try to fetch the value now */ |
| 708 | if (!(action & HV_FETCH_ISSTORE) |
| 709 | && SvRMAGICAL((const SV *)hv) |
| 710 | && mg_find((const SV *)hv, PERL_MAGIC_env)) { |
| 711 | unsigned long len; |
| 712 | const char * const env = PerlEnv_ENVgetenv_len(key,&len); |
| 713 | if (env) { |
| 714 | sv = newSVpvn(env,len); |
| 715 | SvTAINTED_on(sv); |
| 716 | return hv_common(hv, keysv, key, klen, flags, |
| 717 | HV_FETCH_ISSTORE|HV_DISABLE_UVAR_XKEY|return_svp, |
| 718 | sv, hash); |
| 719 | } |
| 720 | } |
| 721 | #endif |
| 722 | |
| 723 | if (!entry && SvREADONLY(hv) && !(action & HV_FETCH_ISEXISTS)) { |
| 724 | hv_notallowed(flags, key, klen, |
| 725 | "Attempt to access disallowed key '%"SVf"' in" |
| 726 | " a restricted hash"); |
| 727 | } |
| 728 | if (!(action & (HV_FETCH_LVALUE|HV_FETCH_ISSTORE))) { |
| 729 | /* Not doing some form of store, so return failure. */ |
| 730 | if (flags & HVhek_FREEKEY) |
| 731 | Safefree(key); |
| 732 | return NULL; |
| 733 | } |
| 734 | if (action & HV_FETCH_LVALUE) { |
| 735 | val = action & HV_FETCH_EMPTY_HE ? NULL : newSV(0); |
| 736 | if (SvMAGICAL(hv)) { |
| 737 | /* At this point the old hv_fetch code would call to hv_store, |
| 738 | which in turn might do some tied magic. So we need to make that |
| 739 | magic check happen. */ |
| 740 | /* gonna assign to this, so it better be there */ |
| 741 | /* If a fetch-as-store fails on the fetch, then the action is to |
| 742 | recurse once into "hv_store". If we didn't do this, then that |
| 743 | recursive call would call the key conversion routine again. |
| 744 | However, as we replace the original key with the converted |
| 745 | key, this would result in a double conversion, which would show |
| 746 | up as a bug if the conversion routine is not idempotent. */ |
| 747 | return hv_common(hv, keysv, key, klen, flags, |
| 748 | HV_FETCH_ISSTORE|HV_DISABLE_UVAR_XKEY|return_svp, |
| 749 | val, hash); |
| 750 | /* XXX Surely that could leak if the fetch-was-store fails? |
| 751 | Just like the hv_fetch. */ |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | /* Welcome to hv_store... */ |
| 756 | |
| 757 | if (!HvARRAY(hv)) { |
| 758 | /* Not sure if we can get here. I think the only case of oentry being |
| 759 | NULL is for %ENV with dynamic env fetch. But that should disappear |
| 760 | with magic in the previous code. */ |
| 761 | char *array; |
| 762 | Newxz(array, |
| 763 | PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */), |
| 764 | char); |
| 765 | HvARRAY(hv) = (HE**)array; |
| 766 | } |
| 767 | |
| 768 | oentry = &(HvARRAY(hv))[hash & (I32) xhv->xhv_max]; |
| 769 | |
| 770 | entry = new_HE(); |
| 771 | /* share_hek_flags will do the free for us. This might be considered |
| 772 | bad API design. */ |
| 773 | if (HvSHAREKEYS(hv)) |
| 774 | HeKEY_hek(entry) = share_hek_flags(key, klen, hash, flags); |
| 775 | else if (hv == PL_strtab) { |
| 776 | /* PL_strtab is usually the only hash without HvSHAREKEYS, so putting |
| 777 | this test here is cheap */ |
| 778 | if (flags & HVhek_FREEKEY) |
| 779 | Safefree(key); |
| 780 | Perl_croak(aTHX_ S_strtab_error, |
| 781 | action & HV_FETCH_LVALUE ? "fetch" : "store"); |
| 782 | } |
| 783 | else /* gotta do the real thing */ |
| 784 | HeKEY_hek(entry) = save_hek_flags(key, klen, hash, flags); |
| 785 | HeVAL(entry) = val; |
| 786 | HeNEXT(entry) = *oentry; |
| 787 | *oentry = entry; |
| 788 | |
| 789 | if (val == &PL_sv_placeholder) |
| 790 | HvPLACEHOLDERS(hv)++; |
| 791 | if (masked_flags & HVhek_ENABLEHVKFLAGS) |
| 792 | HvHASKFLAGS_on(hv); |
| 793 | |
| 794 | { |
| 795 | const HE *counter = HeNEXT(entry); |
| 796 | |
| 797 | xhv->xhv_keys++; /* HvTOTALKEYS(hv)++ */ |
| 798 | if (!counter) { /* initial entry? */ |
| 799 | } else if (xhv->xhv_keys > xhv->xhv_max) { |
| 800 | /* Use only the old HvUSEDKEYS(hv) > HvMAX(hv) condition to limit |
| 801 | bucket splits on a rehashed hash, as we're not going to |
| 802 | split it again, and if someone is lucky (evil) enough to |
| 803 | get all the keys in one list they could exhaust our memory |
| 804 | as we repeatedly double the number of buckets on every |
| 805 | entry. Linear search feels a less worse thing to do. */ |
| 806 | hsplit(hv); |
| 807 | } else if(!HvREHASH(hv)) { |
| 808 | U32 n_links = 1; |
| 809 | |
| 810 | while ((counter = HeNEXT(counter))) |
| 811 | n_links++; |
| 812 | |
| 813 | if (n_links > HV_MAX_LENGTH_BEFORE_SPLIT) { |
| 814 | hsplit(hv); |
| 815 | } |
| 816 | } |
| 817 | } |
| 818 | |
| 819 | if (return_svp) { |
| 820 | return entry ? (void *) &HeVAL(entry) : NULL; |
| 821 | } |
| 822 | return (void *) entry; |
| 823 | } |
| 824 | |
| 825 | STATIC void |
| 826 | S_hv_magic_check(HV *hv, bool *needs_copy, bool *needs_store) |
| 827 | { |
| 828 | const MAGIC *mg = SvMAGIC(hv); |
| 829 | |
| 830 | PERL_ARGS_ASSERT_HV_MAGIC_CHECK; |
| 831 | |
| 832 | *needs_copy = FALSE; |
| 833 | *needs_store = TRUE; |
| 834 | while (mg) { |
| 835 | if (isUPPER(mg->mg_type)) { |
| 836 | *needs_copy = TRUE; |
| 837 | if (mg->mg_type == PERL_MAGIC_tied) { |
| 838 | *needs_store = FALSE; |
| 839 | return; /* We've set all there is to set. */ |
| 840 | } |
| 841 | } |
| 842 | mg = mg->mg_moremagic; |
| 843 | } |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | =for apidoc hv_scalar |
| 848 | |
| 849 | Evaluates the hash in scalar context and returns the result. Handles magic when the hash is tied. |
| 850 | |
| 851 | =cut |
| 852 | */ |
| 853 | |
| 854 | SV * |
| 855 | Perl_hv_scalar(pTHX_ HV *hv) |
| 856 | { |
| 857 | SV *sv; |
| 858 | |
| 859 | PERL_ARGS_ASSERT_HV_SCALAR; |
| 860 | |
| 861 | if (SvRMAGICAL(hv)) { |
| 862 | MAGIC * const mg = mg_find((const SV *)hv, PERL_MAGIC_tied); |
| 863 | if (mg) |
| 864 | return magic_scalarpack(hv, mg); |
| 865 | } |
| 866 | |
| 867 | sv = sv_newmortal(); |
| 868 | if (HvTOTALKEYS((const HV *)hv)) |
| 869 | Perl_sv_setpvf(aTHX_ sv, "%ld/%ld", |
| 870 | (long)HvFILL(hv), (long)HvMAX(hv) + 1); |
| 871 | else |
| 872 | sv_setiv(sv, 0); |
| 873 | |
| 874 | return sv; |
| 875 | } |
| 876 | |
| 877 | /* |
| 878 | =for apidoc hv_delete |
| 879 | |
| 880 | Deletes a key/value pair in the hash. The value's SV is removed from the |
| 881 | hash, made mortal, and returned to the caller. The C<klen> is the length of |
| 882 | the key. The C<flags> value will normally be zero; if set to G_DISCARD then |
| 883 | NULL will be returned. NULL will also be returned if the key is not found. |
| 884 | |
| 885 | =for apidoc hv_delete_ent |
| 886 | |
| 887 | Deletes a key/value pair in the hash. The value SV is removed from the hash, |
| 888 | made mortal, and returned to the caller. The C<flags> value will normally be |
| 889 | zero; if set to G_DISCARD then NULL will be returned. NULL will also be |
| 890 | returned if the key is not found. C<hash> can be a valid precomputed hash |
| 891 | value, or 0 to ask for it to be computed. |
| 892 | |
| 893 | =cut |
| 894 | */ |
| 895 | |
| 896 | STATIC SV * |
| 897 | S_hv_delete_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen, |
| 898 | int k_flags, I32 d_flags, U32 hash) |
| 899 | { |
| 900 | dVAR; |
| 901 | register XPVHV* xhv; |
| 902 | register HE *entry; |
| 903 | register HE **oentry; |
| 904 | bool is_utf8 = (k_flags & HVhek_UTF8) ? TRUE : FALSE; |
| 905 | int masked_flags; |
| 906 | |
| 907 | if (SvRMAGICAL(hv)) { |
| 908 | bool needs_copy; |
| 909 | bool needs_store; |
| 910 | hv_magic_check (hv, &needs_copy, &needs_store); |
| 911 | |
| 912 | if (needs_copy) { |
| 913 | SV *sv; |
| 914 | entry = (HE *) hv_common(hv, keysv, key, klen, |
| 915 | k_flags & ~HVhek_FREEKEY, |
| 916 | HV_FETCH_LVALUE|HV_DISABLE_UVAR_XKEY, |
| 917 | NULL, hash); |
| 918 | sv = entry ? HeVAL(entry) : NULL; |
| 919 | if (sv) { |
| 920 | if (SvMAGICAL(sv)) { |
| 921 | mg_clear(sv); |
| 922 | } |
| 923 | if (!needs_store) { |
| 924 | if (mg_find(sv, PERL_MAGIC_tiedelem)) { |
| 925 | /* No longer an element */ |
| 926 | sv_unmagic(sv, PERL_MAGIC_tiedelem); |
| 927 | return sv; |
| 928 | } |
| 929 | return NULL; /* element cannot be deleted */ |
| 930 | } |
| 931 | #ifdef ENV_IS_CASELESS |
| 932 | else if (mg_find((const SV *)hv, PERL_MAGIC_env)) { |
| 933 | /* XXX This code isn't UTF8 clean. */ |
| 934 | keysv = newSVpvn_flags(key, klen, SVs_TEMP); |
| 935 | if (k_flags & HVhek_FREEKEY) { |
| 936 | Safefree(key); |
| 937 | } |
| 938 | key = strupr(SvPVX(keysv)); |
| 939 | is_utf8 = 0; |
| 940 | k_flags = 0; |
| 941 | hash = 0; |
| 942 | } |
| 943 | #endif |
| 944 | } |
| 945 | } |
| 946 | } |
| 947 | xhv = (XPVHV*)SvANY(hv); |
| 948 | if (!HvARRAY(hv)) |
| 949 | return NULL; |
| 950 | |
| 951 | if (is_utf8) { |
| 952 | const char * const keysave = key; |
| 953 | key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8); |
| 954 | |
| 955 | if (is_utf8) |
| 956 | k_flags |= HVhek_UTF8; |
| 957 | else |
| 958 | k_flags &= ~HVhek_UTF8; |
| 959 | if (key != keysave) { |
| 960 | if (k_flags & HVhek_FREEKEY) { |
| 961 | /* This shouldn't happen if our caller does what we expect, |
| 962 | but strictly the API allows it. */ |
| 963 | Safefree(keysave); |
| 964 | } |
| 965 | k_flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
| 966 | } |
| 967 | HvHASKFLAGS_on(MUTABLE_SV(hv)); |
| 968 | } |
| 969 | |
| 970 | if (HvREHASH(hv) || (!hash && !(keysv && (SvIsCOW_shared_hash(keysv))))) |
| 971 | PERL_HASH_INTERNAL_(hash, key, klen, HvREHASH(hv)); |
| 972 | else if (!hash) |
| 973 | hash = SvSHARED_HASH(keysv); |
| 974 | |
| 975 | masked_flags = (k_flags & HVhek_MASK); |
| 976 | |
| 977 | oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; |
| 978 | entry = *oentry; |
| 979 | for (; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
| 980 | SV *sv; |
| 981 | U8 mro_changes = 0; /* 1 = isa; 2 = package moved */ |
| 982 | GV *gv = NULL; |
| 983 | HV *stash = NULL; |
| 984 | |
| 985 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
| 986 | continue; |
| 987 | if (HeKLEN(entry) != (I32)klen) |
| 988 | continue; |
| 989 | if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */ |
| 990 | continue; |
| 991 | if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8) |
| 992 | continue; |
| 993 | |
| 994 | if (hv == PL_strtab) { |
| 995 | if (k_flags & HVhek_FREEKEY) |
| 996 | Safefree(key); |
| 997 | Perl_croak(aTHX_ S_strtab_error, "delete"); |
| 998 | } |
| 999 | |
| 1000 | /* if placeholder is here, it's already been deleted.... */ |
| 1001 | if (HeVAL(entry) == &PL_sv_placeholder) { |
| 1002 | if (k_flags & HVhek_FREEKEY) |
| 1003 | Safefree(key); |
| 1004 | return NULL; |
| 1005 | } |
| 1006 | if (SvREADONLY(hv) && HeVAL(entry) && SvREADONLY(HeVAL(entry)) |
| 1007 | && !SvIsCOW(HeVAL(entry))) { |
| 1008 | hv_notallowed(k_flags, key, klen, |
| 1009 | "Attempt to delete readonly key '%"SVf"' from" |
| 1010 | " a restricted hash"); |
| 1011 | } |
| 1012 | if (k_flags & HVhek_FREEKEY) |
| 1013 | Safefree(key); |
| 1014 | |
| 1015 | /* If this is a stash and the key ends with ::, then someone is |
| 1016 | * deleting a package. |
| 1017 | */ |
| 1018 | if (HeVAL(entry) && HvENAME_get(hv)) { |
| 1019 | gv = (GV *)HeVAL(entry); |
| 1020 | if (keysv) key = SvPV(keysv, klen); |
| 1021 | if (( |
| 1022 | (klen > 1 && key[klen-2] == ':' && key[klen-1] == ':') |
| 1023 | || |
| 1024 | (klen == 1 && key[0] == ':') |
| 1025 | ) |
| 1026 | && (klen != 6 || hv!=PL_defstash || memNE(key,"main::",6)) |
| 1027 | && SvTYPE(gv) == SVt_PVGV && (stash = GvHV((GV *)gv)) |
| 1028 | && HvENAME_get(stash)) { |
| 1029 | /* A previous version of this code checked that the |
| 1030 | * GV was still in the symbol table by fetching the |
| 1031 | * GV with its name. That is not necessary (and |
| 1032 | * sometimes incorrect), as HvENAME cannot be set |
| 1033 | * on hv if it is not in the symtab. */ |
| 1034 | mro_changes = 2; |
| 1035 | /* Hang on to it for a bit. */ |
| 1036 | SvREFCNT_inc_simple_void_NN( |
| 1037 | sv_2mortal((SV *)gv) |
| 1038 | ); |
| 1039 | } |
| 1040 | else if (klen == 3 && strnEQ(key, "ISA", 3)) |
| 1041 | mro_changes = 1; |
| 1042 | } |
| 1043 | |
| 1044 | if (d_flags & G_DISCARD) { |
| 1045 | sv = HeVAL(entry); |
| 1046 | if (sv) { |
| 1047 | /* deletion of method from stash */ |
| 1048 | if (isGV(sv) && isGV_with_GP(sv) && GvCVu(sv) |
| 1049 | && HvENAME_get(hv)) |
| 1050 | mro_method_changed_in(hv); |
| 1051 | SvREFCNT_dec(sv); |
| 1052 | sv = NULL; |
| 1053 | } |
| 1054 | } else sv = sv_2mortal(HeVAL(entry)); |
| 1055 | HeVAL(entry) = &PL_sv_placeholder; |
| 1056 | |
| 1057 | /* |
| 1058 | * If a restricted hash, rather than really deleting the entry, put |
| 1059 | * a placeholder there. This marks the key as being "approved", so |
| 1060 | * we can still access via not-really-existing key without raising |
| 1061 | * an error. |
| 1062 | */ |
| 1063 | if (SvREADONLY(hv)) |
| 1064 | /* We'll be saving this slot, so the number of allocated keys |
| 1065 | * doesn't go down, but the number placeholders goes up */ |
| 1066 | HvPLACEHOLDERS(hv)++; |
| 1067 | else { |
| 1068 | *oentry = HeNEXT(entry); |
| 1069 | if (SvOOK(hv) && entry == HvAUX(hv)->xhv_eiter /* HvEITER(hv) */) |
| 1070 | HvLAZYDEL_on(hv); |
| 1071 | else { |
| 1072 | if (SvOOK(hv) && HvLAZYDEL(hv) && |
| 1073 | entry == HeNEXT(HvAUX(hv)->xhv_eiter)) |
| 1074 | HeNEXT(HvAUX(hv)->xhv_eiter) = HeNEXT(entry); |
| 1075 | hv_free_ent(hv, entry); |
| 1076 | } |
| 1077 | xhv->xhv_keys--; /* HvTOTALKEYS(hv)-- */ |
| 1078 | if (xhv->xhv_keys == 0) |
| 1079 | HvHASKFLAGS_off(hv); |
| 1080 | } |
| 1081 | |
| 1082 | if (mro_changes == 1) mro_isa_changed_in(hv); |
| 1083 | else if (mro_changes == 2) |
| 1084 | mro_package_moved(NULL, stash, gv, 1); |
| 1085 | |
| 1086 | return sv; |
| 1087 | } |
| 1088 | if (SvREADONLY(hv)) { |
| 1089 | hv_notallowed(k_flags, key, klen, |
| 1090 | "Attempt to delete disallowed key '%"SVf"' from" |
| 1091 | " a restricted hash"); |
| 1092 | } |
| 1093 | |
| 1094 | if (k_flags & HVhek_FREEKEY) |
| 1095 | Safefree(key); |
| 1096 | return NULL; |
| 1097 | } |
| 1098 | |
| 1099 | STATIC void |
| 1100 | S_hsplit(pTHX_ HV *hv) |
| 1101 | { |
| 1102 | dVAR; |
| 1103 | register XPVHV* const xhv = (XPVHV*)SvANY(hv); |
| 1104 | const I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */ |
| 1105 | register I32 newsize = oldsize * 2; |
| 1106 | register I32 i; |
| 1107 | char *a = (char*) HvARRAY(hv); |
| 1108 | register HE **aep; |
| 1109 | int longest_chain = 0; |
| 1110 | int was_shared; |
| 1111 | |
| 1112 | PERL_ARGS_ASSERT_HSPLIT; |
| 1113 | |
| 1114 | /*PerlIO_printf(PerlIO_stderr(), "hsplit called for %p which had %d\n", |
| 1115 | (void*)hv, (int) oldsize);*/ |
| 1116 | |
| 1117 | if (HvPLACEHOLDERS_get(hv) && !SvREADONLY(hv)) { |
| 1118 | /* Can make this clear any placeholders first for non-restricted hashes, |
| 1119 | even though Storable rebuilds restricted hashes by putting in all the |
| 1120 | placeholders (first) before turning on the readonly flag, because |
| 1121 | Storable always pre-splits the hash. */ |
| 1122 | hv_clear_placeholders(hv); |
| 1123 | } |
| 1124 | |
| 1125 | PL_nomemok = TRUE; |
| 1126 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
| 1127 | Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
| 1128 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
| 1129 | if (!a) { |
| 1130 | PL_nomemok = FALSE; |
| 1131 | return; |
| 1132 | } |
| 1133 | if (SvOOK(hv)) { |
| 1134 | Move(&a[oldsize * sizeof(HE*)], &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
| 1135 | } |
| 1136 | #else |
| 1137 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
| 1138 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
| 1139 | if (!a) { |
| 1140 | PL_nomemok = FALSE; |
| 1141 | return; |
| 1142 | } |
| 1143 | Copy(HvARRAY(hv), a, oldsize * sizeof(HE*), char); |
| 1144 | if (SvOOK(hv)) { |
| 1145 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
| 1146 | } |
| 1147 | Safefree(HvARRAY(hv)); |
| 1148 | #endif |
| 1149 | |
| 1150 | PL_nomemok = FALSE; |
| 1151 | Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/ |
| 1152 | xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */ |
| 1153 | HvARRAY(hv) = (HE**) a; |
| 1154 | aep = (HE**)a; |
| 1155 | |
| 1156 | for (i=0; i<oldsize; i++,aep++) { |
| 1157 | int left_length = 0; |
| 1158 | int right_length = 0; |
| 1159 | HE **oentry = aep; |
| 1160 | HE *entry = *aep; |
| 1161 | register HE **bep; |
| 1162 | |
| 1163 | if (!entry) /* non-existent */ |
| 1164 | continue; |
| 1165 | bep = aep+oldsize; |
| 1166 | do { |
| 1167 | if ((HeHASH(entry) & newsize) != (U32)i) { |
| 1168 | *oentry = HeNEXT(entry); |
| 1169 | HeNEXT(entry) = *bep; |
| 1170 | *bep = entry; |
| 1171 | right_length++; |
| 1172 | } |
| 1173 | else { |
| 1174 | oentry = &HeNEXT(entry); |
| 1175 | left_length++; |
| 1176 | } |
| 1177 | entry = *oentry; |
| 1178 | } while (entry); |
| 1179 | /* I think we don't actually need to keep track of the longest length, |
| 1180 | merely flag if anything is too long. But for the moment while |
| 1181 | developing this code I'll track it. */ |
| 1182 | if (left_length > longest_chain) |
| 1183 | longest_chain = left_length; |
| 1184 | if (right_length > longest_chain) |
| 1185 | longest_chain = right_length; |
| 1186 | } |
| 1187 | |
| 1188 | |
| 1189 | /* Pick your policy for "hashing isn't working" here: */ |
| 1190 | if (longest_chain <= HV_MAX_LENGTH_BEFORE_SPLIT /* split worked? */ |
| 1191 | || HvREHASH(hv)) { |
| 1192 | return; |
| 1193 | } |
| 1194 | |
| 1195 | if (hv == PL_strtab) { |
| 1196 | /* Urg. Someone is doing something nasty to the string table. |
| 1197 | Can't win. */ |
| 1198 | return; |
| 1199 | } |
| 1200 | |
| 1201 | /* Awooga. Awooga. Pathological data. */ |
| 1202 | /*PerlIO_printf(PerlIO_stderr(), "%p %d of %d with %d/%d buckets\n", (void*)hv, |
| 1203 | longest_chain, HvTOTALKEYS(hv), HvFILL(hv), 1+HvMAX(hv));*/ |
| 1204 | |
| 1205 | ++newsize; |
| 1206 | Newxz(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
| 1207 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
| 1208 | if (SvOOK(hv)) { |
| 1209 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
| 1210 | } |
| 1211 | |
| 1212 | was_shared = HvSHAREKEYS(hv); |
| 1213 | |
| 1214 | HvSHAREKEYS_off(hv); |
| 1215 | HvREHASH_on(hv); |
| 1216 | |
| 1217 | aep = HvARRAY(hv); |
| 1218 | |
| 1219 | for (i=0; i<newsize; i++,aep++) { |
| 1220 | register HE *entry = *aep; |
| 1221 | while (entry) { |
| 1222 | /* We're going to trash this HE's next pointer when we chain it |
| 1223 | into the new hash below, so store where we go next. */ |
| 1224 | HE * const next = HeNEXT(entry); |
| 1225 | UV hash; |
| 1226 | HE **bep; |
| 1227 | |
| 1228 | /* Rehash it */ |
| 1229 | PERL_HASH_INTERNAL(hash, HeKEY(entry), HeKLEN(entry)); |
| 1230 | |
| 1231 | if (was_shared) { |
| 1232 | /* Unshare it. */ |
| 1233 | HEK * const new_hek |
| 1234 | = save_hek_flags(HeKEY(entry), HeKLEN(entry), |
| 1235 | hash, HeKFLAGS(entry)); |
| 1236 | unshare_hek (HeKEY_hek(entry)); |
| 1237 | HeKEY_hek(entry) = new_hek; |
| 1238 | } else { |
| 1239 | /* Not shared, so simply write the new hash in. */ |
| 1240 | HeHASH(entry) = hash; |
| 1241 | } |
| 1242 | /*PerlIO_printf(PerlIO_stderr(), "%d ", HeKFLAGS(entry));*/ |
| 1243 | HEK_REHASH_on(HeKEY_hek(entry)); |
| 1244 | /*PerlIO_printf(PerlIO_stderr(), "%d\n", HeKFLAGS(entry));*/ |
| 1245 | |
| 1246 | /* Copy oentry to the correct new chain. */ |
| 1247 | bep = ((HE**)a) + (hash & (I32) xhv->xhv_max); |
| 1248 | HeNEXT(entry) = *bep; |
| 1249 | *bep = entry; |
| 1250 | |
| 1251 | entry = next; |
| 1252 | } |
| 1253 | } |
| 1254 | Safefree (HvARRAY(hv)); |
| 1255 | HvARRAY(hv) = (HE **)a; |
| 1256 | } |
| 1257 | |
| 1258 | void |
| 1259 | Perl_hv_ksplit(pTHX_ HV *hv, IV newmax) |
| 1260 | { |
| 1261 | dVAR; |
| 1262 | register XPVHV* xhv = (XPVHV*)SvANY(hv); |
| 1263 | const I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */ |
| 1264 | register I32 newsize; |
| 1265 | register I32 i; |
| 1266 | register char *a; |
| 1267 | register HE **aep; |
| 1268 | |
| 1269 | PERL_ARGS_ASSERT_HV_KSPLIT; |
| 1270 | |
| 1271 | newsize = (I32) newmax; /* possible truncation here */ |
| 1272 | if (newsize != newmax || newmax <= oldsize) |
| 1273 | return; |
| 1274 | while ((newsize & (1 + ~newsize)) != newsize) { |
| 1275 | newsize &= ~(newsize & (1 + ~newsize)); /* get proper power of 2 */ |
| 1276 | } |
| 1277 | if (newsize < newmax) |
| 1278 | newsize *= 2; |
| 1279 | if (newsize < newmax) |
| 1280 | return; /* overflow detection */ |
| 1281 | |
| 1282 | a = (char *) HvARRAY(hv); |
| 1283 | if (a) { |
| 1284 | PL_nomemok = TRUE; |
| 1285 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
| 1286 | Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
| 1287 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
| 1288 | if (!a) { |
| 1289 | PL_nomemok = FALSE; |
| 1290 | return; |
| 1291 | } |
| 1292 | if (SvOOK(hv)) { |
| 1293 | Copy(&a[oldsize * sizeof(HE*)], &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
| 1294 | } |
| 1295 | #else |
| 1296 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
| 1297 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
| 1298 | if (!a) { |
| 1299 | PL_nomemok = FALSE; |
| 1300 | return; |
| 1301 | } |
| 1302 | Copy(HvARRAY(hv), a, oldsize * sizeof(HE*), char); |
| 1303 | if (SvOOK(hv)) { |
| 1304 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
| 1305 | } |
| 1306 | Safefree(HvARRAY(hv)); |
| 1307 | #endif |
| 1308 | PL_nomemok = FALSE; |
| 1309 | Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/ |
| 1310 | } |
| 1311 | else { |
| 1312 | Newxz(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char); |
| 1313 | } |
| 1314 | xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */ |
| 1315 | HvARRAY(hv) = (HE **) a; |
| 1316 | if (!xhv->xhv_keys /* !HvTOTALKEYS(hv) */) /* skip rest if no entries */ |
| 1317 | return; |
| 1318 | |
| 1319 | aep = (HE**)a; |
| 1320 | for (i=0; i<oldsize; i++,aep++) { |
| 1321 | HE **oentry = aep; |
| 1322 | HE *entry = *aep; |
| 1323 | |
| 1324 | if (!entry) /* non-existent */ |
| 1325 | continue; |
| 1326 | do { |
| 1327 | register I32 j = (HeHASH(entry) & newsize); |
| 1328 | |
| 1329 | if (j != i) { |
| 1330 | j -= i; |
| 1331 | *oentry = HeNEXT(entry); |
| 1332 | HeNEXT(entry) = aep[j]; |
| 1333 | aep[j] = entry; |
| 1334 | } |
| 1335 | else |
| 1336 | oentry = &HeNEXT(entry); |
| 1337 | entry = *oentry; |
| 1338 | } while (entry); |
| 1339 | } |
| 1340 | } |
| 1341 | |
| 1342 | HV * |
| 1343 | Perl_newHVhv(pTHX_ HV *ohv) |
| 1344 | { |
| 1345 | dVAR; |
| 1346 | HV * const hv = newHV(); |
| 1347 | STRLEN hv_max; |
| 1348 | |
| 1349 | if (!ohv || !HvTOTALKEYS(ohv)) |
| 1350 | return hv; |
| 1351 | hv_max = HvMAX(ohv); |
| 1352 | |
| 1353 | if (!SvMAGICAL((const SV *)ohv)) { |
| 1354 | /* It's an ordinary hash, so copy it fast. AMS 20010804 */ |
| 1355 | STRLEN i; |
| 1356 | const bool shared = !!HvSHAREKEYS(ohv); |
| 1357 | HE **ents, ** const oents = (HE **)HvARRAY(ohv); |
| 1358 | char *a; |
| 1359 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(hv_max+1), char); |
| 1360 | ents = (HE**)a; |
| 1361 | |
| 1362 | /* In each bucket... */ |
| 1363 | for (i = 0; i <= hv_max; i++) { |
| 1364 | HE *prev = NULL; |
| 1365 | HE *oent = oents[i]; |
| 1366 | |
| 1367 | if (!oent) { |
| 1368 | ents[i] = NULL; |
| 1369 | continue; |
| 1370 | } |
| 1371 | |
| 1372 | /* Copy the linked list of entries. */ |
| 1373 | for (; oent; oent = HeNEXT(oent)) { |
| 1374 | const U32 hash = HeHASH(oent); |
| 1375 | const char * const key = HeKEY(oent); |
| 1376 | const STRLEN len = HeKLEN(oent); |
| 1377 | const int flags = HeKFLAGS(oent); |
| 1378 | HE * const ent = new_HE(); |
| 1379 | SV *const val = HeVAL(oent); |
| 1380 | |
| 1381 | HeVAL(ent) = SvIMMORTAL(val) ? val : newSVsv(val); |
| 1382 | HeKEY_hek(ent) |
| 1383 | = shared ? share_hek_flags(key, len, hash, flags) |
| 1384 | : save_hek_flags(key, len, hash, flags); |
| 1385 | if (prev) |
| 1386 | HeNEXT(prev) = ent; |
| 1387 | else |
| 1388 | ents[i] = ent; |
| 1389 | prev = ent; |
| 1390 | HeNEXT(ent) = NULL; |
| 1391 | } |
| 1392 | } |
| 1393 | |
| 1394 | HvMAX(hv) = hv_max; |
| 1395 | HvTOTALKEYS(hv) = HvTOTALKEYS(ohv); |
| 1396 | HvARRAY(hv) = ents; |
| 1397 | } /* not magical */ |
| 1398 | else { |
| 1399 | /* Iterate over ohv, copying keys and values one at a time. */ |
| 1400 | HE *entry; |
| 1401 | const I32 riter = HvRITER_get(ohv); |
| 1402 | HE * const eiter = HvEITER_get(ohv); |
| 1403 | STRLEN hv_fill = HvFILL(ohv); |
| 1404 | |
| 1405 | /* Can we use fewer buckets? (hv_max is always 2^n-1) */ |
| 1406 | while (hv_max && hv_max + 1 >= hv_fill * 2) |
| 1407 | hv_max = hv_max / 2; |
| 1408 | HvMAX(hv) = hv_max; |
| 1409 | |
| 1410 | hv_iterinit(ohv); |
| 1411 | while ((entry = hv_iternext_flags(ohv, 0))) { |
| 1412 | SV *const val = HeVAL(entry); |
| 1413 | (void)hv_store_flags(hv, HeKEY(entry), HeKLEN(entry), |
| 1414 | SvIMMORTAL(val) ? val : newSVsv(val), |
| 1415 | HeHASH(entry), HeKFLAGS(entry)); |
| 1416 | } |
| 1417 | HvRITER_set(ohv, riter); |
| 1418 | HvEITER_set(ohv, eiter); |
| 1419 | } |
| 1420 | |
| 1421 | return hv; |
| 1422 | } |
| 1423 | |
| 1424 | /* |
| 1425 | =for apidoc Am|HV *|hv_copy_hints_hv|HV *ohv |
| 1426 | |
| 1427 | A specialised version of L</newHVhv> for copying C<%^H>. I<ohv> must be |
| 1428 | a pointer to a hash (which may have C<%^H> magic, but should be generally |
| 1429 | non-magical), or C<NULL> (interpreted as an empty hash). The content |
| 1430 | of I<ohv> is copied to a new hash, which has the C<%^H>-specific magic |
| 1431 | added to it. A pointer to the new hash is returned. |
| 1432 | |
| 1433 | =cut |
| 1434 | */ |
| 1435 | |
| 1436 | HV * |
| 1437 | Perl_hv_copy_hints_hv(pTHX_ HV *const ohv) |
| 1438 | { |
| 1439 | HV * const hv = newHV(); |
| 1440 | |
| 1441 | if (ohv && HvTOTALKEYS(ohv)) { |
| 1442 | STRLEN hv_max = HvMAX(ohv); |
| 1443 | STRLEN hv_fill = HvFILL(ohv); |
| 1444 | HE *entry; |
| 1445 | const I32 riter = HvRITER_get(ohv); |
| 1446 | HE * const eiter = HvEITER_get(ohv); |
| 1447 | |
| 1448 | while (hv_max && hv_max + 1 >= hv_fill * 2) |
| 1449 | hv_max = hv_max / 2; |
| 1450 | HvMAX(hv) = hv_max; |
| 1451 | |
| 1452 | hv_iterinit(ohv); |
| 1453 | while ((entry = hv_iternext_flags(ohv, 0))) { |
| 1454 | SV *const sv = newSVsv(HeVAL(entry)); |
| 1455 | SV *heksv = newSVhek(HeKEY_hek(entry)); |
| 1456 | sv_magic(sv, NULL, PERL_MAGIC_hintselem, |
| 1457 | (char *)heksv, HEf_SVKEY); |
| 1458 | SvREFCNT_dec(heksv); |
| 1459 | (void)hv_store_flags(hv, HeKEY(entry), HeKLEN(entry), |
| 1460 | sv, HeHASH(entry), HeKFLAGS(entry)); |
| 1461 | } |
| 1462 | HvRITER_set(ohv, riter); |
| 1463 | HvEITER_set(ohv, eiter); |
| 1464 | } |
| 1465 | hv_magic(hv, NULL, PERL_MAGIC_hints); |
| 1466 | return hv; |
| 1467 | } |
| 1468 | |
| 1469 | /* like hv_free_ent, but returns the SV rather than freeing it */ |
| 1470 | STATIC SV* |
| 1471 | S_hv_free_ent_ret(pTHX_ HV *hv, register HE *entry) |
| 1472 | { |
| 1473 | dVAR; |
| 1474 | SV *val; |
| 1475 | |
| 1476 | PERL_ARGS_ASSERT_HV_FREE_ENT_RET; |
| 1477 | |
| 1478 | if (!entry) |
| 1479 | return NULL; |
| 1480 | val = HeVAL(entry); |
| 1481 | if (val && isGV(val) && isGV_with_GP(val) && GvCVu(val) && HvENAME(hv)) |
| 1482 | mro_method_changed_in(hv); /* deletion of method from stash */ |
| 1483 | if (HeKLEN(entry) == HEf_SVKEY) { |
| 1484 | SvREFCNT_dec(HeKEY_sv(entry)); |
| 1485 | Safefree(HeKEY_hek(entry)); |
| 1486 | } |
| 1487 | else if (HvSHAREKEYS(hv)) |
| 1488 | unshare_hek(HeKEY_hek(entry)); |
| 1489 | else |
| 1490 | Safefree(HeKEY_hek(entry)); |
| 1491 | del_HE(entry); |
| 1492 | return val; |
| 1493 | } |
| 1494 | |
| 1495 | |
| 1496 | void |
| 1497 | Perl_hv_free_ent(pTHX_ HV *hv, register HE *entry) |
| 1498 | { |
| 1499 | dVAR; |
| 1500 | SV *val; |
| 1501 | |
| 1502 | PERL_ARGS_ASSERT_HV_FREE_ENT; |
| 1503 | |
| 1504 | if (!entry) |
| 1505 | return; |
| 1506 | val = hv_free_ent_ret(hv, entry); |
| 1507 | SvREFCNT_dec(val); |
| 1508 | } |
| 1509 | |
| 1510 | |
| 1511 | void |
| 1512 | Perl_hv_delayfree_ent(pTHX_ HV *hv, register HE *entry) |
| 1513 | { |
| 1514 | dVAR; |
| 1515 | |
| 1516 | PERL_ARGS_ASSERT_HV_DELAYFREE_ENT; |
| 1517 | |
| 1518 | if (!entry) |
| 1519 | return; |
| 1520 | /* SvREFCNT_inc to counter the SvREFCNT_dec in hv_free_ent */ |
| 1521 | sv_2mortal(SvREFCNT_inc(HeVAL(entry))); /* free between statements */ |
| 1522 | if (HeKLEN(entry) == HEf_SVKEY) { |
| 1523 | sv_2mortal(SvREFCNT_inc(HeKEY_sv(entry))); |
| 1524 | } |
| 1525 | hv_free_ent(hv, entry); |
| 1526 | } |
| 1527 | |
| 1528 | /* |
| 1529 | =for apidoc hv_clear |
| 1530 | |
| 1531 | Frees the all the elements of a hash, leaving it empty. |
| 1532 | The XS equivalent of %hash = (). See also L</hv_undef>. |
| 1533 | |
| 1534 | =cut |
| 1535 | */ |
| 1536 | |
| 1537 | void |
| 1538 | Perl_hv_clear(pTHX_ HV *hv) |
| 1539 | { |
| 1540 | dVAR; |
| 1541 | register XPVHV* xhv; |
| 1542 | if (!hv) |
| 1543 | return; |
| 1544 | |
| 1545 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
| 1546 | |
| 1547 | xhv = (XPVHV*)SvANY(hv); |
| 1548 | |
| 1549 | if (SvREADONLY(hv) && HvARRAY(hv) != NULL) { |
| 1550 | /* restricted hash: convert all keys to placeholders */ |
| 1551 | STRLEN i; |
| 1552 | for (i = 0; i <= xhv->xhv_max; i++) { |
| 1553 | HE *entry = (HvARRAY(hv))[i]; |
| 1554 | for (; entry; entry = HeNEXT(entry)) { |
| 1555 | /* not already placeholder */ |
| 1556 | if (HeVAL(entry) != &PL_sv_placeholder) { |
| 1557 | if (HeVAL(entry) && SvREADONLY(HeVAL(entry)) |
| 1558 | && !SvIsCOW(HeVAL(entry))) { |
| 1559 | SV* const keysv = hv_iterkeysv(entry); |
| 1560 | Perl_croak(aTHX_ |
| 1561 | "Attempt to delete readonly key '%"SVf"' from a restricted hash", |
| 1562 | (void*)keysv); |
| 1563 | } |
| 1564 | SvREFCNT_dec(HeVAL(entry)); |
| 1565 | HeVAL(entry) = &PL_sv_placeholder; |
| 1566 | HvPLACEHOLDERS(hv)++; |
| 1567 | } |
| 1568 | } |
| 1569 | } |
| 1570 | } |
| 1571 | else { |
| 1572 | hfreeentries(hv); |
| 1573 | HvPLACEHOLDERS_set(hv, 0); |
| 1574 | |
| 1575 | if (SvRMAGICAL(hv)) |
| 1576 | mg_clear(MUTABLE_SV(hv)); |
| 1577 | |
| 1578 | HvHASKFLAGS_off(hv); |
| 1579 | HvREHASH_off(hv); |
| 1580 | } |
| 1581 | if (SvOOK(hv)) { |
| 1582 | if(HvENAME_get(hv)) |
| 1583 | mro_isa_changed_in(hv); |
| 1584 | HvEITER_set(hv, NULL); |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | /* |
| 1589 | =for apidoc hv_clear_placeholders |
| 1590 | |
| 1591 | Clears any placeholders from a hash. If a restricted hash has any of its keys |
| 1592 | marked as readonly and the key is subsequently deleted, the key is not actually |
| 1593 | deleted but is marked by assigning it a value of &PL_sv_placeholder. This tags |
| 1594 | it so it will be ignored by future operations such as iterating over the hash, |
| 1595 | but will still allow the hash to have a value reassigned to the key at some |
| 1596 | future point. This function clears any such placeholder keys from the hash. |
| 1597 | See Hash::Util::lock_keys() for an example of its use. |
| 1598 | |
| 1599 | =cut |
| 1600 | */ |
| 1601 | |
| 1602 | void |
| 1603 | Perl_hv_clear_placeholders(pTHX_ HV *hv) |
| 1604 | { |
| 1605 | dVAR; |
| 1606 | const U32 items = (U32)HvPLACEHOLDERS_get(hv); |
| 1607 | |
| 1608 | PERL_ARGS_ASSERT_HV_CLEAR_PLACEHOLDERS; |
| 1609 | |
| 1610 | if (items) |
| 1611 | clear_placeholders(hv, items); |
| 1612 | } |
| 1613 | |
| 1614 | static void |
| 1615 | S_clear_placeholders(pTHX_ HV *hv, U32 items) |
| 1616 | { |
| 1617 | dVAR; |
| 1618 | I32 i; |
| 1619 | |
| 1620 | PERL_ARGS_ASSERT_CLEAR_PLACEHOLDERS; |
| 1621 | |
| 1622 | if (items == 0) |
| 1623 | return; |
| 1624 | |
| 1625 | i = HvMAX(hv); |
| 1626 | do { |
| 1627 | /* Loop down the linked list heads */ |
| 1628 | HE **oentry = &(HvARRAY(hv))[i]; |
| 1629 | HE *entry; |
| 1630 | |
| 1631 | while ((entry = *oentry)) { |
| 1632 | if (HeVAL(entry) == &PL_sv_placeholder) { |
| 1633 | *oentry = HeNEXT(entry); |
| 1634 | if (entry == HvEITER_get(hv)) |
| 1635 | HvLAZYDEL_on(hv); |
| 1636 | else { |
| 1637 | if (SvOOK(hv) && HvLAZYDEL(hv) && |
| 1638 | entry == HeNEXT(HvAUX(hv)->xhv_eiter)) |
| 1639 | HeNEXT(HvAUX(hv)->xhv_eiter) = HeNEXT(entry); |
| 1640 | hv_free_ent(hv, entry); |
| 1641 | } |
| 1642 | |
| 1643 | if (--items == 0) { |
| 1644 | /* Finished. */ |
| 1645 | HvTOTALKEYS(hv) -= (IV)HvPLACEHOLDERS_get(hv); |
| 1646 | if (HvUSEDKEYS(hv) == 0) |
| 1647 | HvHASKFLAGS_off(hv); |
| 1648 | HvPLACEHOLDERS_set(hv, 0); |
| 1649 | return; |
| 1650 | } |
| 1651 | } else { |
| 1652 | oentry = &HeNEXT(entry); |
| 1653 | } |
| 1654 | } |
| 1655 | } while (--i >= 0); |
| 1656 | /* You can't get here, hence assertion should always fail. */ |
| 1657 | assert (items == 0); |
| 1658 | assert (0); |
| 1659 | } |
| 1660 | |
| 1661 | STATIC void |
| 1662 | S_hfreeentries(pTHX_ HV *hv) |
| 1663 | { |
| 1664 | STRLEN index = 0; |
| 1665 | XPVHV * const xhv = (XPVHV*)SvANY(hv); |
| 1666 | SV *sv; |
| 1667 | |
| 1668 | PERL_ARGS_ASSERT_HFREEENTRIES; |
| 1669 | |
| 1670 | while ((sv = Perl_hfree_next_entry(aTHX_ hv, &index))||xhv->xhv_keys) { |
| 1671 | SvREFCNT_dec(sv); |
| 1672 | } |
| 1673 | } |
| 1674 | |
| 1675 | |
| 1676 | /* hfree_next_entry() |
| 1677 | * For use only by S_hfreeentries() and sv_clear(). |
| 1678 | * Delete the next available HE from hv and return the associated SV. |
| 1679 | * Returns null on empty hash. Nevertheless null is not a reliable |
| 1680 | * indicator that the hash is empty, as the deleted entry may have a |
| 1681 | * null value. |
| 1682 | * indexp is a pointer to the current index into HvARRAY. The index should |
| 1683 | * initially be set to 0. hfree_next_entry() may update it. */ |
| 1684 | |
| 1685 | SV* |
| 1686 | Perl_hfree_next_entry(pTHX_ HV *hv, STRLEN *indexp) |
| 1687 | { |
| 1688 | struct xpvhv_aux *iter; |
| 1689 | HE *entry; |
| 1690 | HE ** array; |
| 1691 | #ifdef DEBUGGING |
| 1692 | STRLEN orig_index = *indexp; |
| 1693 | #endif |
| 1694 | |
| 1695 | PERL_ARGS_ASSERT_HFREE_NEXT_ENTRY; |
| 1696 | |
| 1697 | if (SvOOK(hv) && ((iter = HvAUX(hv))) |
| 1698 | && ((entry = iter->xhv_eiter)) ) |
| 1699 | { |
| 1700 | /* the iterator may get resurrected after each |
| 1701 | * destructor call, so check each time */ |
| 1702 | if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
| 1703 | HvLAZYDEL_off(hv); |
| 1704 | hv_free_ent(hv, entry); |
| 1705 | /* warning: at this point HvARRAY may have been |
| 1706 | * re-allocated, HvMAX changed etc */ |
| 1707 | } |
| 1708 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
| 1709 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
| 1710 | } |
| 1711 | |
| 1712 | if (!((XPVHV*)SvANY(hv))->xhv_keys) |
| 1713 | return NULL; |
| 1714 | |
| 1715 | array = HvARRAY(hv); |
| 1716 | assert(array); |
| 1717 | while ( ! ((entry = array[*indexp])) ) { |
| 1718 | if ((*indexp)++ >= HvMAX(hv)) |
| 1719 | *indexp = 0; |
| 1720 | assert(*indexp != orig_index); |
| 1721 | } |
| 1722 | array[*indexp] = HeNEXT(entry); |
| 1723 | ((XPVHV*) SvANY(hv))->xhv_keys--; |
| 1724 | |
| 1725 | if ( PL_phase != PERL_PHASE_DESTRUCT && HvENAME(hv) |
| 1726 | && HeVAL(entry) && isGV(HeVAL(entry)) |
| 1727 | && GvHV(HeVAL(entry)) && HvENAME(GvHV(HeVAL(entry))) |
| 1728 | ) { |
| 1729 | STRLEN klen; |
| 1730 | const char * const key = HePV(entry,klen); |
| 1731 | if ((klen > 1 && key[klen-1]==':' && key[klen-2]==':') |
| 1732 | || (klen == 1 && key[0] == ':')) { |
| 1733 | mro_package_moved( |
| 1734 | NULL, GvHV(HeVAL(entry)), |
| 1735 | (GV *)HeVAL(entry), 0 |
| 1736 | ); |
| 1737 | } |
| 1738 | } |
| 1739 | return hv_free_ent_ret(hv, entry); |
| 1740 | } |
| 1741 | |
| 1742 | |
| 1743 | /* |
| 1744 | =for apidoc hv_undef |
| 1745 | |
| 1746 | Undefines the hash. The XS equivalent of undef(%hash). |
| 1747 | |
| 1748 | As well as freeing all the elements of the hash (like hv_clear()), this |
| 1749 | also frees any auxiliary data and storage associated with the hash. |
| 1750 | See also L</hv_clear>. |
| 1751 | |
| 1752 | =cut |
| 1753 | */ |
| 1754 | |
| 1755 | void |
| 1756 | Perl_hv_undef_flags(pTHX_ HV *hv, U32 flags) |
| 1757 | { |
| 1758 | dVAR; |
| 1759 | register XPVHV* xhv; |
| 1760 | const char *name; |
| 1761 | |
| 1762 | if (!hv) |
| 1763 | return; |
| 1764 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
| 1765 | xhv = (XPVHV*)SvANY(hv); |
| 1766 | |
| 1767 | /* The name must be deleted before the call to hfreeeeentries so that |
| 1768 | CVs are anonymised properly. But the effective name must be pre- |
| 1769 | served until after that call (and only deleted afterwards if the |
| 1770 | call originated from sv_clear). For stashes with one name that is |
| 1771 | both the canonical name and the effective name, hv_name_set has to |
| 1772 | allocate an array for storing the effective name. We can skip that |
| 1773 | during global destruction, as it does not matter where the CVs point |
| 1774 | if they will be freed anyway. */ |
| 1775 | /* note that the code following prior to hfreeentries is duplicated |
| 1776 | * in sv_clear(), and changes here should be done there too */ |
| 1777 | if (PL_phase != PERL_PHASE_DESTRUCT && (name = HvNAME(hv))) { |
| 1778 | if (PL_stashcache) |
| 1779 | (void)hv_delete(PL_stashcache, name, HvNAMELEN_get(hv), G_DISCARD); |
| 1780 | hv_name_set(hv, NULL, 0, 0); |
| 1781 | } |
| 1782 | hfreeentries(hv); |
| 1783 | if (SvOOK(hv)) { |
| 1784 | struct xpvhv_aux * const aux = HvAUX(hv); |
| 1785 | struct mro_meta *meta; |
| 1786 | |
| 1787 | if ((name = HvENAME_get(hv))) { |
| 1788 | if (PL_phase != PERL_PHASE_DESTRUCT) |
| 1789 | mro_isa_changed_in(hv); |
| 1790 | if (PL_stashcache) |
| 1791 | (void)hv_delete( |
| 1792 | PL_stashcache, name, HvENAMELEN_get(hv), G_DISCARD |
| 1793 | ); |
| 1794 | } |
| 1795 | |
| 1796 | /* If this call originated from sv_clear, then we must check for |
| 1797 | * effective names that need freeing, as well as the usual name. */ |
| 1798 | name = HvNAME(hv); |
| 1799 | if (flags & HV_NAME_SETALL ? !!aux->xhv_name_u.xhvnameu_name : !!name) { |
| 1800 | if (name && PL_stashcache) |
| 1801 | (void)hv_delete(PL_stashcache, name, HvNAMELEN_get(hv), G_DISCARD); |
| 1802 | hv_name_set(hv, NULL, 0, flags); |
| 1803 | } |
| 1804 | if((meta = aux->xhv_mro_meta)) { |
| 1805 | if (meta->mro_linear_all) { |
| 1806 | SvREFCNT_dec(MUTABLE_SV(meta->mro_linear_all)); |
| 1807 | meta->mro_linear_all = NULL; |
| 1808 | /* This is just acting as a shortcut pointer. */ |
| 1809 | meta->mro_linear_current = NULL; |
| 1810 | } else if (meta->mro_linear_current) { |
| 1811 | /* Only the current MRO is stored, so this owns the data. |
| 1812 | */ |
| 1813 | SvREFCNT_dec(meta->mro_linear_current); |
| 1814 | meta->mro_linear_current = NULL; |
| 1815 | } |
| 1816 | if(meta->mro_nextmethod) SvREFCNT_dec(meta->mro_nextmethod); |
| 1817 | SvREFCNT_dec(meta->isa); |
| 1818 | Safefree(meta); |
| 1819 | aux->xhv_mro_meta = NULL; |
| 1820 | } |
| 1821 | if (!aux->xhv_name_u.xhvnameu_name && ! aux->xhv_backreferences) |
| 1822 | SvFLAGS(hv) &= ~SVf_OOK; |
| 1823 | } |
| 1824 | if (!SvOOK(hv)) { |
| 1825 | Safefree(HvARRAY(hv)); |
| 1826 | xhv->xhv_max = 7; /* HvMAX(hv) = 7 (it's a normal hash) */ |
| 1827 | HvARRAY(hv) = 0; |
| 1828 | } |
| 1829 | HvPLACEHOLDERS_set(hv, 0); |
| 1830 | |
| 1831 | if (SvRMAGICAL(hv)) |
| 1832 | mg_clear(MUTABLE_SV(hv)); |
| 1833 | } |
| 1834 | |
| 1835 | /* |
| 1836 | =for apidoc hv_fill |
| 1837 | |
| 1838 | Returns the number of hash buckets that happen to be in use. This function is |
| 1839 | wrapped by the macro C<HvFILL>. |
| 1840 | |
| 1841 | Previously this value was stored in the HV structure, rather than being |
| 1842 | calculated on demand. |
| 1843 | |
| 1844 | =cut |
| 1845 | */ |
| 1846 | |
| 1847 | STRLEN |
| 1848 | Perl_hv_fill(pTHX_ HV const *const hv) |
| 1849 | { |
| 1850 | STRLEN count = 0; |
| 1851 | HE **ents = HvARRAY(hv); |
| 1852 | |
| 1853 | PERL_ARGS_ASSERT_HV_FILL; |
| 1854 | |
| 1855 | if (ents) { |
| 1856 | HE *const *const last = ents + HvMAX(hv); |
| 1857 | count = last + 1 - ents; |
| 1858 | |
| 1859 | do { |
| 1860 | if (!*ents) |
| 1861 | --count; |
| 1862 | } while (++ents <= last); |
| 1863 | } |
| 1864 | return count; |
| 1865 | } |
| 1866 | |
| 1867 | static struct xpvhv_aux* |
| 1868 | S_hv_auxinit(HV *hv) { |
| 1869 | struct xpvhv_aux *iter; |
| 1870 | char *array; |
| 1871 | |
| 1872 | PERL_ARGS_ASSERT_HV_AUXINIT; |
| 1873 | |
| 1874 | if (!HvARRAY(hv)) { |
| 1875 | Newxz(array, PERL_HV_ARRAY_ALLOC_BYTES(HvMAX(hv) + 1) |
| 1876 | + sizeof(struct xpvhv_aux), char); |
| 1877 | } else { |
| 1878 | array = (char *) HvARRAY(hv); |
| 1879 | Renew(array, PERL_HV_ARRAY_ALLOC_BYTES(HvMAX(hv) + 1) |
| 1880 | + sizeof(struct xpvhv_aux), char); |
| 1881 | } |
| 1882 | HvARRAY(hv) = (HE**) array; |
| 1883 | /* SvOOK_on(hv) attacks the IV flags. */ |
| 1884 | SvFLAGS(hv) |= SVf_OOK; |
| 1885 | iter = HvAUX(hv); |
| 1886 | |
| 1887 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
| 1888 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
| 1889 | iter->xhv_name_u.xhvnameu_name = 0; |
| 1890 | iter->xhv_name_count = 0; |
| 1891 | iter->xhv_backreferences = 0; |
| 1892 | iter->xhv_mro_meta = NULL; |
| 1893 | return iter; |
| 1894 | } |
| 1895 | |
| 1896 | /* |
| 1897 | =for apidoc hv_iterinit |
| 1898 | |
| 1899 | Prepares a starting point to traverse a hash table. Returns the number of |
| 1900 | keys in the hash (i.e. the same as C<HvUSEDKEYS(hv)>). The return value is |
| 1901 | currently only meaningful for hashes without tie magic. |
| 1902 | |
| 1903 | NOTE: Before version 5.004_65, C<hv_iterinit> used to return the number of |
| 1904 | hash buckets that happen to be in use. If you still need that esoteric |
| 1905 | value, you can get it through the macro C<HvFILL(hv)>. |
| 1906 | |
| 1907 | |
| 1908 | =cut |
| 1909 | */ |
| 1910 | |
| 1911 | I32 |
| 1912 | Perl_hv_iterinit(pTHX_ HV *hv) |
| 1913 | { |
| 1914 | PERL_ARGS_ASSERT_HV_ITERINIT; |
| 1915 | |
| 1916 | /* FIXME: Are we not NULL, or do we croak? Place bets now! */ |
| 1917 | |
| 1918 | if (!hv) |
| 1919 | Perl_croak(aTHX_ "Bad hash"); |
| 1920 | |
| 1921 | if (SvOOK(hv)) { |
| 1922 | struct xpvhv_aux * const iter = HvAUX(hv); |
| 1923 | HE * const entry = iter->xhv_eiter; /* HvEITER(hv) */ |
| 1924 | if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
| 1925 | HvLAZYDEL_off(hv); |
| 1926 | hv_free_ent(hv, entry); |
| 1927 | } |
| 1928 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
| 1929 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
| 1930 | } else { |
| 1931 | hv_auxinit(hv); |
| 1932 | } |
| 1933 | |
| 1934 | /* used to be xhv->xhv_fill before 5.004_65 */ |
| 1935 | return HvTOTALKEYS(hv); |
| 1936 | } |
| 1937 | |
| 1938 | I32 * |
| 1939 | Perl_hv_riter_p(pTHX_ HV *hv) { |
| 1940 | struct xpvhv_aux *iter; |
| 1941 | |
| 1942 | PERL_ARGS_ASSERT_HV_RITER_P; |
| 1943 | |
| 1944 | if (!hv) |
| 1945 | Perl_croak(aTHX_ "Bad hash"); |
| 1946 | |
| 1947 | iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
| 1948 | return &(iter->xhv_riter); |
| 1949 | } |
| 1950 | |
| 1951 | HE ** |
| 1952 | Perl_hv_eiter_p(pTHX_ HV *hv) { |
| 1953 | struct xpvhv_aux *iter; |
| 1954 | |
| 1955 | PERL_ARGS_ASSERT_HV_EITER_P; |
| 1956 | |
| 1957 | if (!hv) |
| 1958 | Perl_croak(aTHX_ "Bad hash"); |
| 1959 | |
| 1960 | iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
| 1961 | return &(iter->xhv_eiter); |
| 1962 | } |
| 1963 | |
| 1964 | void |
| 1965 | Perl_hv_riter_set(pTHX_ HV *hv, I32 riter) { |
| 1966 | struct xpvhv_aux *iter; |
| 1967 | |
| 1968 | PERL_ARGS_ASSERT_HV_RITER_SET; |
| 1969 | |
| 1970 | if (!hv) |
| 1971 | Perl_croak(aTHX_ "Bad hash"); |
| 1972 | |
| 1973 | if (SvOOK(hv)) { |
| 1974 | iter = HvAUX(hv); |
| 1975 | } else { |
| 1976 | if (riter == -1) |
| 1977 | return; |
| 1978 | |
| 1979 | iter = hv_auxinit(hv); |
| 1980 | } |
| 1981 | iter->xhv_riter = riter; |
| 1982 | } |
| 1983 | |
| 1984 | void |
| 1985 | Perl_hv_eiter_set(pTHX_ HV *hv, HE *eiter) { |
| 1986 | struct xpvhv_aux *iter; |
| 1987 | |
| 1988 | PERL_ARGS_ASSERT_HV_EITER_SET; |
| 1989 | |
| 1990 | if (!hv) |
| 1991 | Perl_croak(aTHX_ "Bad hash"); |
| 1992 | |
| 1993 | if (SvOOK(hv)) { |
| 1994 | iter = HvAUX(hv); |
| 1995 | } else { |
| 1996 | /* 0 is the default so don't go malloc()ing a new structure just to |
| 1997 | hold 0. */ |
| 1998 | if (!eiter) |
| 1999 | return; |
| 2000 | |
| 2001 | iter = hv_auxinit(hv); |
| 2002 | } |
| 2003 | iter->xhv_eiter = eiter; |
| 2004 | } |
| 2005 | |
| 2006 | void |
| 2007 | Perl_hv_name_set(pTHX_ HV *hv, const char *name, U32 len, U32 flags) |
| 2008 | { |
| 2009 | dVAR; |
| 2010 | struct xpvhv_aux *iter; |
| 2011 | U32 hash; |
| 2012 | HEK **spot; |
| 2013 | |
| 2014 | PERL_ARGS_ASSERT_HV_NAME_SET; |
| 2015 | PERL_UNUSED_ARG(flags); |
| 2016 | |
| 2017 | if (len > I32_MAX) |
| 2018 | Perl_croak(aTHX_ "panic: hv name too long (%"UVuf")", (UV) len); |
| 2019 | |
| 2020 | if (SvOOK(hv)) { |
| 2021 | iter = HvAUX(hv); |
| 2022 | if (iter->xhv_name_u.xhvnameu_name) { |
| 2023 | if(iter->xhv_name_count) { |
| 2024 | if(flags & HV_NAME_SETALL) { |
| 2025 | HEK ** const name = HvAUX(hv)->xhv_name_u.xhvnameu_names; |
| 2026 | HEK **hekp = name + ( |
| 2027 | iter->xhv_name_count < 0 |
| 2028 | ? -iter->xhv_name_count |
| 2029 | : iter->xhv_name_count |
| 2030 | ); |
| 2031 | while(hekp-- > name+1) |
| 2032 | unshare_hek_or_pvn(*hekp, 0, 0, 0); |
| 2033 | /* The first elem may be null. */ |
| 2034 | if(*name) unshare_hek_or_pvn(*name, 0, 0, 0); |
| 2035 | Safefree(name); |
| 2036 | spot = &iter->xhv_name_u.xhvnameu_name; |
| 2037 | iter->xhv_name_count = 0; |
| 2038 | } |
| 2039 | else { |
| 2040 | if(iter->xhv_name_count > 0) { |
| 2041 | /* shift some things over */ |
| 2042 | Renew( |
| 2043 | iter->xhv_name_u.xhvnameu_names, iter->xhv_name_count + 1, HEK * |
| 2044 | ); |
| 2045 | spot = iter->xhv_name_u.xhvnameu_names; |
| 2046 | spot[iter->xhv_name_count] = spot[1]; |
| 2047 | spot[1] = spot[0]; |
| 2048 | iter->xhv_name_count = -(iter->xhv_name_count + 1); |
| 2049 | } |
| 2050 | else if(*(spot = iter->xhv_name_u.xhvnameu_names)) { |
| 2051 | unshare_hek_or_pvn(*spot, 0, 0, 0); |
| 2052 | } |
| 2053 | } |
| 2054 | } |
| 2055 | else if (flags & HV_NAME_SETALL) { |
| 2056 | unshare_hek_or_pvn(iter->xhv_name_u.xhvnameu_name, 0, 0, 0); |
| 2057 | spot = &iter->xhv_name_u.xhvnameu_name; |
| 2058 | } |
| 2059 | else { |
| 2060 | HEK * const existing_name = iter->xhv_name_u.xhvnameu_name; |
| 2061 | Newx(iter->xhv_name_u.xhvnameu_names, 2, HEK *); |
| 2062 | iter->xhv_name_count = -2; |
| 2063 | spot = iter->xhv_name_u.xhvnameu_names; |
| 2064 | spot[1] = existing_name; |
| 2065 | } |
| 2066 | } |
| 2067 | else { spot = &iter->xhv_name_u.xhvnameu_name; iter->xhv_name_count = 0; } |
| 2068 | } else { |
| 2069 | if (name == 0) |
| 2070 | return; |
| 2071 | |
| 2072 | iter = hv_auxinit(hv); |
| 2073 | spot = &iter->xhv_name_u.xhvnameu_name; |
| 2074 | } |
| 2075 | PERL_HASH(hash, name, len); |
| 2076 | *spot = name ? share_hek(name, len, hash) : NULL; |
| 2077 | } |
| 2078 | |
| 2079 | /* |
| 2080 | =for apidoc hv_ename_add |
| 2081 | |
| 2082 | Adds a name to a stash's internal list of effective names. See |
| 2083 | C<hv_ename_delete>. |
| 2084 | |
| 2085 | This is called when a stash is assigned to a new location in the symbol |
| 2086 | table. |
| 2087 | |
| 2088 | =cut |
| 2089 | */ |
| 2090 | |
| 2091 | void |
| 2092 | Perl_hv_ename_add(pTHX_ HV *hv, const char *name, U32 len, U32 flags) |
| 2093 | { |
| 2094 | dVAR; |
| 2095 | struct xpvhv_aux *aux = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
| 2096 | U32 hash; |
| 2097 | |
| 2098 | PERL_ARGS_ASSERT_HV_ENAME_ADD; |
| 2099 | PERL_UNUSED_ARG(flags); |
| 2100 | |
| 2101 | if (len > I32_MAX) |
| 2102 | Perl_croak(aTHX_ "panic: hv name too long (%"UVuf")", (UV) len); |
| 2103 | |
| 2104 | PERL_HASH(hash, name, len); |
| 2105 | |
| 2106 | if (aux->xhv_name_count) { |
| 2107 | HEK ** const xhv_name = aux->xhv_name_u.xhvnameu_names; |
| 2108 | I32 count = aux->xhv_name_count; |
| 2109 | HEK **hekp = xhv_name + (count < 0 ? -count : count); |
| 2110 | while (hekp-- > xhv_name) |
| 2111 | if ( |
| 2112 | HEK_LEN(*hekp) == (I32)len && memEQ(HEK_KEY(*hekp), name, len) |
| 2113 | ) { |
| 2114 | if (hekp == xhv_name && count < 0) |
| 2115 | aux->xhv_name_count = -count; |
| 2116 | return; |
| 2117 | } |
| 2118 | if (count < 0) aux->xhv_name_count--, count = -count; |
| 2119 | else aux->xhv_name_count++; |
| 2120 | Renew(aux->xhv_name_u.xhvnameu_names, count + 1, HEK *); |
| 2121 | (aux->xhv_name_u.xhvnameu_names)[count] = share_hek(name, len, hash); |
| 2122 | } |
| 2123 | else { |
| 2124 | HEK *existing_name = aux->xhv_name_u.xhvnameu_name; |
| 2125 | if ( |
| 2126 | existing_name && HEK_LEN(existing_name) == (I32)len |
| 2127 | && memEQ(HEK_KEY(existing_name), name, len) |
| 2128 | ) return; |
| 2129 | Newx(aux->xhv_name_u.xhvnameu_names, 2, HEK *); |
| 2130 | aux->xhv_name_count = existing_name ? 2 : -2; |
| 2131 | *aux->xhv_name_u.xhvnameu_names = existing_name; |
| 2132 | (aux->xhv_name_u.xhvnameu_names)[1] = share_hek(name, len, hash); |
| 2133 | } |
| 2134 | } |
| 2135 | |
| 2136 | /* |
| 2137 | =for apidoc hv_ename_delete |
| 2138 | |
| 2139 | Removes a name from a stash's internal list of effective names. If this is |
| 2140 | the name returned by C<HvENAME>, then another name in the list will take |
| 2141 | its place (C<HvENAME> will use it). |
| 2142 | |
| 2143 | This is called when a stash is deleted from the symbol table. |
| 2144 | |
| 2145 | =cut |
| 2146 | */ |
| 2147 | |
| 2148 | void |
| 2149 | Perl_hv_ename_delete(pTHX_ HV *hv, const char *name, U32 len, U32 flags) |
| 2150 | { |
| 2151 | dVAR; |
| 2152 | struct xpvhv_aux *aux; |
| 2153 | |
| 2154 | PERL_ARGS_ASSERT_HV_ENAME_DELETE; |
| 2155 | PERL_UNUSED_ARG(flags); |
| 2156 | |
| 2157 | if (len > I32_MAX) |
| 2158 | Perl_croak(aTHX_ "panic: hv name too long (%"UVuf")", (UV) len); |
| 2159 | |
| 2160 | if (!SvOOK(hv)) return; |
| 2161 | |
| 2162 | aux = HvAUX(hv); |
| 2163 | if (!aux->xhv_name_u.xhvnameu_name) return; |
| 2164 | |
| 2165 | if (aux->xhv_name_count) { |
| 2166 | HEK ** const namep = aux->xhv_name_u.xhvnameu_names; |
| 2167 | I32 const count = aux->xhv_name_count; |
| 2168 | HEK **victim = namep + (count < 0 ? -count : count); |
| 2169 | while (victim-- > namep + 1) |
| 2170 | if ( |
| 2171 | HEK_LEN(*victim) == (I32)len |
| 2172 | && memEQ(HEK_KEY(*victim), name, len) |
| 2173 | ) { |
| 2174 | unshare_hek_or_pvn(*victim, 0, 0, 0); |
| 2175 | if (count < 0) ++aux->xhv_name_count; |
| 2176 | else --aux->xhv_name_count; |
| 2177 | if ( |
| 2178 | (aux->xhv_name_count == 1 || aux->xhv_name_count == -1) |
| 2179 | && !*namep |
| 2180 | ) { /* if there are none left */ |
| 2181 | Safefree(namep); |
| 2182 | aux->xhv_name_u.xhvnameu_names = NULL; |
| 2183 | aux->xhv_name_count = 0; |
| 2184 | } |
| 2185 | else { |
| 2186 | /* Move the last one back to fill the empty slot. It |
| 2187 | does not matter what order they are in. */ |
| 2188 | *victim = *(namep + (count < 0 ? -count : count) - 1); |
| 2189 | } |
| 2190 | return; |
| 2191 | } |
| 2192 | if ( |
| 2193 | count > 0 && HEK_LEN(*namep) == (I32)len |
| 2194 | && memEQ(HEK_KEY(*namep),name,len) |
| 2195 | ) { |
| 2196 | aux->xhv_name_count = -count; |
| 2197 | } |
| 2198 | } |
| 2199 | else if( |
| 2200 | HEK_LEN(aux->xhv_name_u.xhvnameu_name) == (I32)len |
| 2201 | && memEQ(HEK_KEY(aux->xhv_name_u.xhvnameu_name), name, len) |
| 2202 | ) { |
| 2203 | HEK * const namehek = aux->xhv_name_u.xhvnameu_name; |
| 2204 | Newx(aux->xhv_name_u.xhvnameu_names, 1, HEK *); |
| 2205 | *aux->xhv_name_u.xhvnameu_names = namehek; |
| 2206 | aux->xhv_name_count = -1; |
| 2207 | } |
| 2208 | } |
| 2209 | |
| 2210 | AV ** |
| 2211 | Perl_hv_backreferences_p(pTHX_ HV *hv) { |
| 2212 | struct xpvhv_aux * const iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
| 2213 | |
| 2214 | PERL_ARGS_ASSERT_HV_BACKREFERENCES_P; |
| 2215 | PERL_UNUSED_CONTEXT; |
| 2216 | |
| 2217 | return &(iter->xhv_backreferences); |
| 2218 | } |
| 2219 | |
| 2220 | void |
| 2221 | Perl_hv_kill_backrefs(pTHX_ HV *hv) { |
| 2222 | AV *av; |
| 2223 | |
| 2224 | PERL_ARGS_ASSERT_HV_KILL_BACKREFS; |
| 2225 | |
| 2226 | if (!SvOOK(hv)) |
| 2227 | return; |
| 2228 | |
| 2229 | av = HvAUX(hv)->xhv_backreferences; |
| 2230 | |
| 2231 | if (av) { |
| 2232 | HvAUX(hv)->xhv_backreferences = 0; |
| 2233 | Perl_sv_kill_backrefs(aTHX_ MUTABLE_SV(hv), av); |
| 2234 | if (SvTYPE(av) == SVt_PVAV) |
| 2235 | SvREFCNT_dec(av); |
| 2236 | } |
| 2237 | } |
| 2238 | |
| 2239 | /* |
| 2240 | hv_iternext is implemented as a macro in hv.h |
| 2241 | |
| 2242 | =for apidoc hv_iternext |
| 2243 | |
| 2244 | Returns entries from a hash iterator. See C<hv_iterinit>. |
| 2245 | |
| 2246 | You may call C<hv_delete> or C<hv_delete_ent> on the hash entry that the |
| 2247 | iterator currently points to, without losing your place or invalidating your |
| 2248 | iterator. Note that in this case the current entry is deleted from the hash |
| 2249 | with your iterator holding the last reference to it. Your iterator is flagged |
| 2250 | to free the entry on the next call to C<hv_iternext>, so you must not discard |
| 2251 | your iterator immediately else the entry will leak - call C<hv_iternext> to |
| 2252 | trigger the resource deallocation. |
| 2253 | |
| 2254 | =for apidoc hv_iternext_flags |
| 2255 | |
| 2256 | Returns entries from a hash iterator. See C<hv_iterinit> and C<hv_iternext>. |
| 2257 | The C<flags> value will normally be zero; if HV_ITERNEXT_WANTPLACEHOLDERS is |
| 2258 | set the placeholders keys (for restricted hashes) will be returned in addition |
| 2259 | to normal keys. By default placeholders are automatically skipped over. |
| 2260 | Currently a placeholder is implemented with a value that is |
| 2261 | C<&Perl_sv_placeholder>. Note that the implementation of placeholders and |
| 2262 | restricted hashes may change, and the implementation currently is |
| 2263 | insufficiently abstracted for any change to be tidy. |
| 2264 | |
| 2265 | =cut |
| 2266 | */ |
| 2267 | |
| 2268 | HE * |
| 2269 | Perl_hv_iternext_flags(pTHX_ HV *hv, I32 flags) |
| 2270 | { |
| 2271 | dVAR; |
| 2272 | register XPVHV* xhv; |
| 2273 | register HE *entry; |
| 2274 | HE *oldentry; |
| 2275 | MAGIC* mg; |
| 2276 | struct xpvhv_aux *iter; |
| 2277 | |
| 2278 | PERL_ARGS_ASSERT_HV_ITERNEXT_FLAGS; |
| 2279 | |
| 2280 | if (!hv) |
| 2281 | Perl_croak(aTHX_ "Bad hash"); |
| 2282 | |
| 2283 | xhv = (XPVHV*)SvANY(hv); |
| 2284 | |
| 2285 | if (!SvOOK(hv)) { |
| 2286 | /* Too many things (well, pp_each at least) merrily assume that you can |
| 2287 | call iv_iternext without calling hv_iterinit, so we'll have to deal |
| 2288 | with it. */ |
| 2289 | hv_iterinit(hv); |
| 2290 | } |
| 2291 | iter = HvAUX(hv); |
| 2292 | |
| 2293 | oldentry = entry = iter->xhv_eiter; /* HvEITER(hv) */ |
| 2294 | if (SvMAGICAL(hv) && SvRMAGICAL(hv)) { |
| 2295 | if ( ( mg = mg_find((const SV *)hv, PERL_MAGIC_tied) ) ) { |
| 2296 | SV * const key = sv_newmortal(); |
| 2297 | if (entry) { |
| 2298 | sv_setsv(key, HeSVKEY_force(entry)); |
| 2299 | SvREFCNT_dec(HeSVKEY(entry)); /* get rid of previous key */ |
| 2300 | } |
| 2301 | else { |
| 2302 | char *k; |
| 2303 | HEK *hek; |
| 2304 | |
| 2305 | /* one HE per MAGICAL hash */ |
| 2306 | iter->xhv_eiter = entry = new_HE(); /* HvEITER(hv) = new_HE() */ |
| 2307 | Zero(entry, 1, HE); |
| 2308 | Newxz(k, HEK_BASESIZE + sizeof(const SV *), char); |
| 2309 | hek = (HEK*)k; |
| 2310 | HeKEY_hek(entry) = hek; |
| 2311 | HeKLEN(entry) = HEf_SVKEY; |
| 2312 | } |
| 2313 | magic_nextpack(MUTABLE_SV(hv),mg,key); |
| 2314 | if (SvOK(key)) { |
| 2315 | /* force key to stay around until next time */ |
| 2316 | HeSVKEY_set(entry, SvREFCNT_inc_simple_NN(key)); |
| 2317 | return entry; /* beware, hent_val is not set */ |
| 2318 | } |
| 2319 | SvREFCNT_dec(HeVAL(entry)); |
| 2320 | Safefree(HeKEY_hek(entry)); |
| 2321 | del_HE(entry); |
| 2322 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
| 2323 | return NULL; |
| 2324 | } |
| 2325 | } |
| 2326 | #if defined(DYNAMIC_ENV_FETCH) && !defined(__riscos__) /* set up %ENV for iteration */ |
| 2327 | if (!entry && SvRMAGICAL((const SV *)hv) |
| 2328 | && mg_find((const SV *)hv, PERL_MAGIC_env)) { |
| 2329 | prime_env_iter(); |
| 2330 | #ifdef VMS |
| 2331 | /* The prime_env_iter() on VMS just loaded up new hash values |
| 2332 | * so the iteration count needs to be reset back to the beginning |
| 2333 | */ |
| 2334 | hv_iterinit(hv); |
| 2335 | iter = HvAUX(hv); |
| 2336 | oldentry = entry = iter->xhv_eiter; /* HvEITER(hv) */ |
| 2337 | #endif |
| 2338 | } |
| 2339 | #endif |
| 2340 | |
| 2341 | /* hv_iterint now ensures this. */ |
| 2342 | assert (HvARRAY(hv)); |
| 2343 | |
| 2344 | /* At start of hash, entry is NULL. */ |
| 2345 | if (entry) |
| 2346 | { |
| 2347 | entry = HeNEXT(entry); |
| 2348 | if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) { |
| 2349 | /* |
| 2350 | * Skip past any placeholders -- don't want to include them in |
| 2351 | * any iteration. |
| 2352 | */ |
| 2353 | while (entry && HeVAL(entry) == &PL_sv_placeholder) { |
| 2354 | entry = HeNEXT(entry); |
| 2355 | } |
| 2356 | } |
| 2357 | } |
| 2358 | |
| 2359 | /* Skip the entire loop if the hash is empty. */ |
| 2360 | if ((flags & HV_ITERNEXT_WANTPLACEHOLDERS) |
| 2361 | ? HvTOTALKEYS(hv) : HvUSEDKEYS(hv)) { |
| 2362 | while (!entry) { |
| 2363 | /* OK. Come to the end of the current list. Grab the next one. */ |
| 2364 | |
| 2365 | iter->xhv_riter++; /* HvRITER(hv)++ */ |
| 2366 | if (iter->xhv_riter > (I32)xhv->xhv_max /* HvRITER(hv) > HvMAX(hv) */) { |
| 2367 | /* There is no next one. End of the hash. */ |
| 2368 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
| 2369 | break; |
| 2370 | } |
| 2371 | entry = (HvARRAY(hv))[iter->xhv_riter]; |
| 2372 | |
| 2373 | if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) { |
| 2374 | /* If we have an entry, but it's a placeholder, don't count it. |
| 2375 | Try the next. */ |
| 2376 | while (entry && HeVAL(entry) == &PL_sv_placeholder) |
| 2377 | entry = HeNEXT(entry); |
| 2378 | } |
| 2379 | /* Will loop again if this linked list starts NULL |
| 2380 | (for HV_ITERNEXT_WANTPLACEHOLDERS) |
| 2381 | or if we run through it and find only placeholders. */ |
| 2382 | } |
| 2383 | } |
| 2384 | |
| 2385 | if (oldentry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
| 2386 | HvLAZYDEL_off(hv); |
| 2387 | hv_free_ent(hv, oldentry); |
| 2388 | } |
| 2389 | |
| 2390 | /*if (HvREHASH(hv) && entry && !HeKREHASH(entry)) |
| 2391 | PerlIO_printf(PerlIO_stderr(), "Awooga %p %p\n", (void*)hv, (void*)entry);*/ |
| 2392 | |
| 2393 | iter->xhv_eiter = entry; /* HvEITER(hv) = entry */ |
| 2394 | return entry; |
| 2395 | } |
| 2396 | |
| 2397 | /* |
| 2398 | =for apidoc hv_iterkey |
| 2399 | |
| 2400 | Returns the key from the current position of the hash iterator. See |
| 2401 | C<hv_iterinit>. |
| 2402 | |
| 2403 | =cut |
| 2404 | */ |
| 2405 | |
| 2406 | char * |
| 2407 | Perl_hv_iterkey(pTHX_ register HE *entry, I32 *retlen) |
| 2408 | { |
| 2409 | PERL_ARGS_ASSERT_HV_ITERKEY; |
| 2410 | |
| 2411 | if (HeKLEN(entry) == HEf_SVKEY) { |
| 2412 | STRLEN len; |
| 2413 | char * const p = SvPV(HeKEY_sv(entry), len); |
| 2414 | *retlen = len; |
| 2415 | return p; |
| 2416 | } |
| 2417 | else { |
| 2418 | *retlen = HeKLEN(entry); |
| 2419 | return HeKEY(entry); |
| 2420 | } |
| 2421 | } |
| 2422 | |
| 2423 | /* unlike hv_iterval(), this always returns a mortal copy of the key */ |
| 2424 | /* |
| 2425 | =for apidoc hv_iterkeysv |
| 2426 | |
| 2427 | Returns the key as an C<SV*> from the current position of the hash |
| 2428 | iterator. The return value will always be a mortal copy of the key. Also |
| 2429 | see C<hv_iterinit>. |
| 2430 | |
| 2431 | =cut |
| 2432 | */ |
| 2433 | |
| 2434 | SV * |
| 2435 | Perl_hv_iterkeysv(pTHX_ register HE *entry) |
| 2436 | { |
| 2437 | PERL_ARGS_ASSERT_HV_ITERKEYSV; |
| 2438 | |
| 2439 | return sv_2mortal(newSVhek(HeKEY_hek(entry))); |
| 2440 | } |
| 2441 | |
| 2442 | /* |
| 2443 | =for apidoc hv_iterval |
| 2444 | |
| 2445 | Returns the value from the current position of the hash iterator. See |
| 2446 | C<hv_iterkey>. |
| 2447 | |
| 2448 | =cut |
| 2449 | */ |
| 2450 | |
| 2451 | SV * |
| 2452 | Perl_hv_iterval(pTHX_ HV *hv, register HE *entry) |
| 2453 | { |
| 2454 | PERL_ARGS_ASSERT_HV_ITERVAL; |
| 2455 | |
| 2456 | if (SvRMAGICAL(hv)) { |
| 2457 | if (mg_find((const SV *)hv, PERL_MAGIC_tied)) { |
| 2458 | SV* const sv = sv_newmortal(); |
| 2459 | if (HeKLEN(entry) == HEf_SVKEY) |
| 2460 | mg_copy(MUTABLE_SV(hv), sv, (char*)HeKEY_sv(entry), HEf_SVKEY); |
| 2461 | else |
| 2462 | mg_copy(MUTABLE_SV(hv), sv, HeKEY(entry), HeKLEN(entry)); |
| 2463 | return sv; |
| 2464 | } |
| 2465 | } |
| 2466 | return HeVAL(entry); |
| 2467 | } |
| 2468 | |
| 2469 | /* |
| 2470 | =for apidoc hv_iternextsv |
| 2471 | |
| 2472 | Performs an C<hv_iternext>, C<hv_iterkey>, and C<hv_iterval> in one |
| 2473 | operation. |
| 2474 | |
| 2475 | =cut |
| 2476 | */ |
| 2477 | |
| 2478 | SV * |
| 2479 | Perl_hv_iternextsv(pTHX_ HV *hv, char **key, I32 *retlen) |
| 2480 | { |
| 2481 | HE * const he = hv_iternext_flags(hv, 0); |
| 2482 | |
| 2483 | PERL_ARGS_ASSERT_HV_ITERNEXTSV; |
| 2484 | |
| 2485 | if (!he) |
| 2486 | return NULL; |
| 2487 | *key = hv_iterkey(he, retlen); |
| 2488 | return hv_iterval(hv, he); |
| 2489 | } |
| 2490 | |
| 2491 | /* |
| 2492 | |
| 2493 | Now a macro in hv.h |
| 2494 | |
| 2495 | =for apidoc hv_magic |
| 2496 | |
| 2497 | Adds magic to a hash. See C<sv_magic>. |
| 2498 | |
| 2499 | =cut |
| 2500 | */ |
| 2501 | |
| 2502 | /* possibly free a shared string if no one has access to it |
| 2503 | * len and hash must both be valid for str. |
| 2504 | */ |
| 2505 | void |
| 2506 | Perl_unsharepvn(pTHX_ const char *str, I32 len, U32 hash) |
| 2507 | { |
| 2508 | unshare_hek_or_pvn (NULL, str, len, hash); |
| 2509 | } |
| 2510 | |
| 2511 | |
| 2512 | void |
| 2513 | Perl_unshare_hek(pTHX_ HEK *hek) |
| 2514 | { |
| 2515 | assert(hek); |
| 2516 | unshare_hek_or_pvn(hek, NULL, 0, 0); |
| 2517 | } |
| 2518 | |
| 2519 | /* possibly free a shared string if no one has access to it |
| 2520 | hek if non-NULL takes priority over the other 3, else str, len and hash |
| 2521 | are used. If so, len and hash must both be valid for str. |
| 2522 | */ |
| 2523 | STATIC void |
| 2524 | S_unshare_hek_or_pvn(pTHX_ const HEK *hek, const char *str, I32 len, U32 hash) |
| 2525 | { |
| 2526 | dVAR; |
| 2527 | register XPVHV* xhv; |
| 2528 | HE *entry; |
| 2529 | register HE **oentry; |
| 2530 | bool is_utf8 = FALSE; |
| 2531 | int k_flags = 0; |
| 2532 | const char * const save = str; |
| 2533 | struct shared_he *he = NULL; |
| 2534 | |
| 2535 | if (hek) { |
| 2536 | /* Find the shared he which is just before us in memory. */ |
| 2537 | he = (struct shared_he *)(((char *)hek) |
| 2538 | - STRUCT_OFFSET(struct shared_he, |
| 2539 | shared_he_hek)); |
| 2540 | |
| 2541 | /* Assert that the caller passed us a genuine (or at least consistent) |
| 2542 | shared hek */ |
| 2543 | assert (he->shared_he_he.hent_hek == hek); |
| 2544 | |
| 2545 | if (he->shared_he_he.he_valu.hent_refcount - 1) { |
| 2546 | --he->shared_he_he.he_valu.hent_refcount; |
| 2547 | return; |
| 2548 | } |
| 2549 | |
| 2550 | hash = HEK_HASH(hek); |
| 2551 | } else if (len < 0) { |
| 2552 | STRLEN tmplen = -len; |
| 2553 | is_utf8 = TRUE; |
| 2554 | /* See the note in hv_fetch(). --jhi */ |
| 2555 | str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8); |
| 2556 | len = tmplen; |
| 2557 | if (is_utf8) |
| 2558 | k_flags = HVhek_UTF8; |
| 2559 | if (str != save) |
| 2560 | k_flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
| 2561 | } |
| 2562 | |
| 2563 | /* what follows was the moral equivalent of: |
| 2564 | if ((Svp = hv_fetch(PL_strtab, tmpsv, FALSE, hash))) { |
| 2565 | if (--*Svp == NULL) |
| 2566 | hv_delete(PL_strtab, str, len, G_DISCARD, hash); |
| 2567 | } */ |
| 2568 | xhv = (XPVHV*)SvANY(PL_strtab); |
| 2569 | /* assert(xhv_array != 0) */ |
| 2570 | oentry = &(HvARRAY(PL_strtab))[hash & (I32) HvMAX(PL_strtab)]; |
| 2571 | if (he) { |
| 2572 | const HE *const he_he = &(he->shared_he_he); |
| 2573 | for (entry = *oentry; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
| 2574 | if (entry == he_he) |
| 2575 | break; |
| 2576 | } |
| 2577 | } else { |
| 2578 | const int flags_masked = k_flags & HVhek_MASK; |
| 2579 | for (entry = *oentry; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
| 2580 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
| 2581 | continue; |
| 2582 | if (HeKLEN(entry) != len) |
| 2583 | continue; |
| 2584 | if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */ |
| 2585 | continue; |
| 2586 | if (HeKFLAGS(entry) != flags_masked) |
| 2587 | continue; |
| 2588 | break; |
| 2589 | } |
| 2590 | } |
| 2591 | |
| 2592 | if (entry) { |
| 2593 | if (--entry->he_valu.hent_refcount == 0) { |
| 2594 | *oentry = HeNEXT(entry); |
| 2595 | Safefree(entry); |
| 2596 | xhv->xhv_keys--; /* HvTOTALKEYS(hv)-- */ |
| 2597 | } |
| 2598 | } |
| 2599 | |
| 2600 | if (!entry) |
| 2601 | Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), |
| 2602 | "Attempt to free non-existent shared string '%s'%s" |
| 2603 | pTHX__FORMAT, |
| 2604 | hek ? HEK_KEY(hek) : str, |
| 2605 | ((k_flags & HVhek_UTF8) ? " (utf8)" : "") pTHX__VALUE); |
| 2606 | if (k_flags & HVhek_FREEKEY) |
| 2607 | Safefree(str); |
| 2608 | } |
| 2609 | |
| 2610 | /* get a (constant) string ptr from the global string table |
| 2611 | * string will get added if it is not already there. |
| 2612 | * len and hash must both be valid for str. |
| 2613 | */ |
| 2614 | HEK * |
| 2615 | Perl_share_hek(pTHX_ const char *str, I32 len, register U32 hash) |
| 2616 | { |
| 2617 | bool is_utf8 = FALSE; |
| 2618 | int flags = 0; |
| 2619 | const char * const save = str; |
| 2620 | |
| 2621 | PERL_ARGS_ASSERT_SHARE_HEK; |
| 2622 | |
| 2623 | if (len < 0) { |
| 2624 | STRLEN tmplen = -len; |
| 2625 | is_utf8 = TRUE; |
| 2626 | /* See the note in hv_fetch(). --jhi */ |
| 2627 | str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8); |
| 2628 | len = tmplen; |
| 2629 | /* If we were able to downgrade here, then than means that we were passed |
| 2630 | in a key which only had chars 0-255, but was utf8 encoded. */ |
| 2631 | if (is_utf8) |
| 2632 | flags = HVhek_UTF8; |
| 2633 | /* If we found we were able to downgrade the string to bytes, then |
| 2634 | we should flag that it needs upgrading on keys or each. Also flag |
| 2635 | that we need share_hek_flags to free the string. */ |
| 2636 | if (str != save) |
| 2637 | flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
| 2638 | } |
| 2639 | |
| 2640 | return share_hek_flags (str, len, hash, flags); |
| 2641 | } |
| 2642 | |
| 2643 | STATIC HEK * |
| 2644 | S_share_hek_flags(pTHX_ const char *str, I32 len, register U32 hash, int flags) |
| 2645 | { |
| 2646 | dVAR; |
| 2647 | register HE *entry; |
| 2648 | const int flags_masked = flags & HVhek_MASK; |
| 2649 | const U32 hindex = hash & (I32) HvMAX(PL_strtab); |
| 2650 | register XPVHV * const xhv = (XPVHV*)SvANY(PL_strtab); |
| 2651 | |
| 2652 | PERL_ARGS_ASSERT_SHARE_HEK_FLAGS; |
| 2653 | |
| 2654 | /* what follows is the moral equivalent of: |
| 2655 | |
| 2656 | if (!(Svp = hv_fetch(PL_strtab, str, len, FALSE))) |
| 2657 | hv_store(PL_strtab, str, len, NULL, hash); |
| 2658 | |
| 2659 | Can't rehash the shared string table, so not sure if it's worth |
| 2660 | counting the number of entries in the linked list |
| 2661 | */ |
| 2662 | |
| 2663 | /* assert(xhv_array != 0) */ |
| 2664 | entry = (HvARRAY(PL_strtab))[hindex]; |
| 2665 | for (;entry; entry = HeNEXT(entry)) { |
| 2666 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
| 2667 | continue; |
| 2668 | if (HeKLEN(entry) != len) |
| 2669 | continue; |
| 2670 | if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */ |
| 2671 | continue; |
| 2672 | if (HeKFLAGS(entry) != flags_masked) |
| 2673 | continue; |
| 2674 | break; |
| 2675 | } |
| 2676 | |
| 2677 | if (!entry) { |
| 2678 | /* What used to be head of the list. |
| 2679 | If this is NULL, then we're the first entry for this slot, which |
| 2680 | means we need to increate fill. */ |
| 2681 | struct shared_he *new_entry; |
| 2682 | HEK *hek; |
| 2683 | char *k; |
| 2684 | HE **const head = &HvARRAY(PL_strtab)[hindex]; |
| 2685 | HE *const next = *head; |
| 2686 | |
| 2687 | /* We don't actually store a HE from the arena and a regular HEK. |
| 2688 | Instead we allocate one chunk of memory big enough for both, |
| 2689 | and put the HEK straight after the HE. This way we can find the |
| 2690 | HEK directly from the HE. |
| 2691 | */ |
| 2692 | |
| 2693 | Newx(k, STRUCT_OFFSET(struct shared_he, |
| 2694 | shared_he_hek.hek_key[0]) + len + 2, char); |
| 2695 | new_entry = (struct shared_he *)k; |
| 2696 | entry = &(new_entry->shared_he_he); |
| 2697 | hek = &(new_entry->shared_he_hek); |
| 2698 | |
| 2699 | Copy(str, HEK_KEY(hek), len, char); |
| 2700 | HEK_KEY(hek)[len] = 0; |
| 2701 | HEK_LEN(hek) = len; |
| 2702 | HEK_HASH(hek) = hash; |
| 2703 | HEK_FLAGS(hek) = (unsigned char)flags_masked; |
| 2704 | |
| 2705 | /* Still "point" to the HEK, so that other code need not know what |
| 2706 | we're up to. */ |
| 2707 | HeKEY_hek(entry) = hek; |
| 2708 | entry->he_valu.hent_refcount = 0; |
| 2709 | HeNEXT(entry) = next; |
| 2710 | *head = entry; |
| 2711 | |
| 2712 | xhv->xhv_keys++; /* HvTOTALKEYS(hv)++ */ |
| 2713 | if (!next) { /* initial entry? */ |
| 2714 | } else if (xhv->xhv_keys > xhv->xhv_max /* HvUSEDKEYS(hv) > HvMAX(hv) */) { |
| 2715 | hsplit(PL_strtab); |
| 2716 | } |
| 2717 | } |
| 2718 | |
| 2719 | ++entry->he_valu.hent_refcount; |
| 2720 | |
| 2721 | if (flags & HVhek_FREEKEY) |
| 2722 | Safefree(str); |
| 2723 | |
| 2724 | return HeKEY_hek(entry); |
| 2725 | } |
| 2726 | |
| 2727 | I32 * |
| 2728 | Perl_hv_placeholders_p(pTHX_ HV *hv) |
| 2729 | { |
| 2730 | dVAR; |
| 2731 | MAGIC *mg = mg_find((const SV *)hv, PERL_MAGIC_rhash); |
| 2732 | |
| 2733 | PERL_ARGS_ASSERT_HV_PLACEHOLDERS_P; |
| 2734 | |
| 2735 | if (!mg) { |
| 2736 | mg = sv_magicext(MUTABLE_SV(hv), 0, PERL_MAGIC_rhash, 0, 0, 0); |
| 2737 | |
| 2738 | if (!mg) { |
| 2739 | Perl_die(aTHX_ "panic: hv_placeholders_p"); |
| 2740 | } |
| 2741 | } |
| 2742 | return &(mg->mg_len); |
| 2743 | } |
| 2744 | |
| 2745 | |
| 2746 | I32 |
| 2747 | Perl_hv_placeholders_get(pTHX_ const HV *hv) |
| 2748 | { |
| 2749 | dVAR; |
| 2750 | MAGIC * const mg = mg_find((const SV *)hv, PERL_MAGIC_rhash); |
| 2751 | |
| 2752 | PERL_ARGS_ASSERT_HV_PLACEHOLDERS_GET; |
| 2753 | |
| 2754 | return mg ? mg->mg_len : 0; |
| 2755 | } |
| 2756 | |
| 2757 | void |
| 2758 | Perl_hv_placeholders_set(pTHX_ HV *hv, I32 ph) |
| 2759 | { |
| 2760 | dVAR; |
| 2761 | MAGIC * const mg = mg_find((const SV *)hv, PERL_MAGIC_rhash); |
| 2762 | |
| 2763 | PERL_ARGS_ASSERT_HV_PLACEHOLDERS_SET; |
| 2764 | |
| 2765 | if (mg) { |
| 2766 | mg->mg_len = ph; |
| 2767 | } else if (ph) { |
| 2768 | if (!sv_magicext(MUTABLE_SV(hv), 0, PERL_MAGIC_rhash, 0, 0, ph)) |
| 2769 | Perl_die(aTHX_ "panic: hv_placeholders_set"); |
| 2770 | } |
| 2771 | /* else we don't need to add magic to record 0 placeholders. */ |
| 2772 | } |
| 2773 | |
| 2774 | STATIC SV * |
| 2775 | S_refcounted_he_value(pTHX_ const struct refcounted_he *he) |
| 2776 | { |
| 2777 | dVAR; |
| 2778 | SV *value; |
| 2779 | |
| 2780 | PERL_ARGS_ASSERT_REFCOUNTED_HE_VALUE; |
| 2781 | |
| 2782 | switch(he->refcounted_he_data[0] & HVrhek_typemask) { |
| 2783 | case HVrhek_undef: |
| 2784 | value = newSV(0); |
| 2785 | break; |
| 2786 | case HVrhek_delete: |
| 2787 | value = &PL_sv_placeholder; |
| 2788 | break; |
| 2789 | case HVrhek_IV: |
| 2790 | value = newSViv(he->refcounted_he_val.refcounted_he_u_iv); |
| 2791 | break; |
| 2792 | case HVrhek_UV: |
| 2793 | value = newSVuv(he->refcounted_he_val.refcounted_he_u_uv); |
| 2794 | break; |
| 2795 | case HVrhek_PV: |
| 2796 | case HVrhek_PV_UTF8: |
| 2797 | /* Create a string SV that directly points to the bytes in our |
| 2798 | structure. */ |
| 2799 | value = newSV_type(SVt_PV); |
| 2800 | SvPV_set(value, (char *) he->refcounted_he_data + 1); |
| 2801 | SvCUR_set(value, he->refcounted_he_val.refcounted_he_u_len); |
| 2802 | /* This stops anything trying to free it */ |
| 2803 | SvLEN_set(value, 0); |
| 2804 | SvPOK_on(value); |
| 2805 | SvREADONLY_on(value); |
| 2806 | if ((he->refcounted_he_data[0] & HVrhek_typemask) == HVrhek_PV_UTF8) |
| 2807 | SvUTF8_on(value); |
| 2808 | break; |
| 2809 | default: |
| 2810 | Perl_croak(aTHX_ "panic: refcounted_he_value bad flags %"UVxf, |
| 2811 | (UV)he->refcounted_he_data[0]); |
| 2812 | } |
| 2813 | return value; |
| 2814 | } |
| 2815 | |
| 2816 | /* |
| 2817 | =for apidoc m|HV *|refcounted_he_chain_2hv|const struct refcounted_he *c|U32 flags |
| 2818 | |
| 2819 | Generates and returns a C<HV *> representing the content of a |
| 2820 | C<refcounted_he> chain. |
| 2821 | I<flags> is currently unused and must be zero. |
| 2822 | |
| 2823 | =cut |
| 2824 | */ |
| 2825 | HV * |
| 2826 | Perl_refcounted_he_chain_2hv(pTHX_ const struct refcounted_he *chain, U32 flags) |
| 2827 | { |
| 2828 | dVAR; |
| 2829 | HV *hv; |
| 2830 | U32 placeholders, max; |
| 2831 | |
| 2832 | if (flags) |
| 2833 | Perl_croak(aTHX_ "panic: refcounted_he_chain_2hv bad flags %"UVxf, |
| 2834 | (UV)flags); |
| 2835 | |
| 2836 | /* We could chase the chain once to get an idea of the number of keys, |
| 2837 | and call ksplit. But for now we'll make a potentially inefficient |
| 2838 | hash with only 8 entries in its array. */ |
| 2839 | hv = newHV(); |
| 2840 | max = HvMAX(hv); |
| 2841 | if (!HvARRAY(hv)) { |
| 2842 | char *array; |
| 2843 | Newxz(array, PERL_HV_ARRAY_ALLOC_BYTES(max + 1), char); |
| 2844 | HvARRAY(hv) = (HE**)array; |
| 2845 | } |
| 2846 | |
| 2847 | placeholders = 0; |
| 2848 | while (chain) { |
| 2849 | #ifdef USE_ITHREADS |
| 2850 | U32 hash = chain->refcounted_he_hash; |
| 2851 | #else |
| 2852 | U32 hash = HEK_HASH(chain->refcounted_he_hek); |
| 2853 | #endif |
| 2854 | HE **oentry = &((HvARRAY(hv))[hash & max]); |
| 2855 | HE *entry = *oentry; |
| 2856 | SV *value; |
| 2857 | |
| 2858 | for (; entry; entry = HeNEXT(entry)) { |
| 2859 | if (HeHASH(entry) == hash) { |
| 2860 | /* We might have a duplicate key here. If so, entry is older |
| 2861 | than the key we've already put in the hash, so if they are |
| 2862 | the same, skip adding entry. */ |
| 2863 | #ifdef USE_ITHREADS |
| 2864 | const STRLEN klen = HeKLEN(entry); |
| 2865 | const char *const key = HeKEY(entry); |
| 2866 | if (klen == chain->refcounted_he_keylen |
| 2867 | && (!!HeKUTF8(entry) |
| 2868 | == !!(chain->refcounted_he_data[0] & HVhek_UTF8)) |
| 2869 | && memEQ(key, REF_HE_KEY(chain), klen)) |
| 2870 | goto next_please; |
| 2871 | #else |
| 2872 | if (HeKEY_hek(entry) == chain->refcounted_he_hek) |
| 2873 | goto next_please; |
| 2874 | if (HeKLEN(entry) == HEK_LEN(chain->refcounted_he_hek) |
| 2875 | && HeKUTF8(entry) == HEK_UTF8(chain->refcounted_he_hek) |
| 2876 | && memEQ(HeKEY(entry), HEK_KEY(chain->refcounted_he_hek), |
| 2877 | HeKLEN(entry))) |
| 2878 | goto next_please; |
| 2879 | #endif |
| 2880 | } |
| 2881 | } |
| 2882 | assert (!entry); |
| 2883 | entry = new_HE(); |
| 2884 | |
| 2885 | #ifdef USE_ITHREADS |
| 2886 | HeKEY_hek(entry) |
| 2887 | = share_hek_flags(REF_HE_KEY(chain), |
| 2888 | chain->refcounted_he_keylen, |
| 2889 | chain->refcounted_he_hash, |
| 2890 | (chain->refcounted_he_data[0] |
| 2891 | & (HVhek_UTF8|HVhek_WASUTF8))); |
| 2892 | #else |
| 2893 | HeKEY_hek(entry) = share_hek_hek(chain->refcounted_he_hek); |
| 2894 | #endif |
| 2895 | value = refcounted_he_value(chain); |
| 2896 | if (value == &PL_sv_placeholder) |
| 2897 | placeholders++; |
| 2898 | HeVAL(entry) = value; |
| 2899 | |
| 2900 | /* Link it into the chain. */ |
| 2901 | HeNEXT(entry) = *oentry; |
| 2902 | *oentry = entry; |
| 2903 | |
| 2904 | HvTOTALKEYS(hv)++; |
| 2905 | |
| 2906 | next_please: |
| 2907 | chain = chain->refcounted_he_next; |
| 2908 | } |
| 2909 | |
| 2910 | if (placeholders) { |
| 2911 | clear_placeholders(hv, placeholders); |
| 2912 | HvTOTALKEYS(hv) -= placeholders; |
| 2913 | } |
| 2914 | |
| 2915 | /* We could check in the loop to see if we encounter any keys with key |
| 2916 | flags, but it's probably not worth it, as this per-hash flag is only |
| 2917 | really meant as an optimisation for things like Storable. */ |
| 2918 | HvHASKFLAGS_on(hv); |
| 2919 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
| 2920 | |
| 2921 | return hv; |
| 2922 | } |
| 2923 | |
| 2924 | /* |
| 2925 | =for apidoc m|SV *|refcounted_he_fetch_pvn|const struct refcounted_he *chain|const char *keypv|STRLEN keylen|U32 hash|U32 flags |
| 2926 | |
| 2927 | Search along a C<refcounted_he> chain for an entry with the key specified |
| 2928 | by I<keypv> and I<keylen>. If I<flags> has the C<REFCOUNTED_HE_KEY_UTF8> |
| 2929 | bit set, the key octets are interpreted as UTF-8, otherwise they |
| 2930 | are interpreted as Latin-1. I<hash> is a precomputed hash of the key |
| 2931 | string, or zero if it has not been precomputed. Returns a mortal scalar |
| 2932 | representing the value associated with the key, or C<&PL_sv_placeholder> |
| 2933 | if there is no value associated with the key. |
| 2934 | |
| 2935 | =cut |
| 2936 | */ |
| 2937 | |
| 2938 | SV * |
| 2939 | Perl_refcounted_he_fetch_pvn(pTHX_ const struct refcounted_he *chain, |
| 2940 | const char *keypv, STRLEN keylen, U32 hash, U32 flags) |
| 2941 | { |
| 2942 | dVAR; |
| 2943 | U8 utf8_flag; |
| 2944 | PERL_ARGS_ASSERT_REFCOUNTED_HE_FETCH_PVN; |
| 2945 | |
| 2946 | if (flags & ~REFCOUNTED_HE_KEY_UTF8) |
| 2947 | Perl_croak(aTHX_ "panic: refcounted_he_fetch_pvn bad flags %"UVxf, |
| 2948 | (UV)flags); |
| 2949 | if (!chain) |
| 2950 | return &PL_sv_placeholder; |
| 2951 | if (flags & REFCOUNTED_HE_KEY_UTF8) { |
| 2952 | /* For searching purposes, canonicalise to Latin-1 where possible. */ |
| 2953 | const char *keyend = keypv + keylen, *p; |
| 2954 | STRLEN nonascii_count = 0; |
| 2955 | for (p = keypv; p != keyend; p++) { |
| 2956 | U8 c = (U8)*p; |
| 2957 | if (c & 0x80) { |
| 2958 | if (!((c & 0xfe) == 0xc2 && ++p != keyend && |
| 2959 | (((U8)*p) & 0xc0) == 0x80)) |
| 2960 | goto canonicalised_key; |
| 2961 | nonascii_count++; |
| 2962 | } |
| 2963 | } |
| 2964 | if (nonascii_count) { |
| 2965 | char *q; |
| 2966 | const char *p = keypv, *keyend = keypv + keylen; |
| 2967 | keylen -= nonascii_count; |
| 2968 | Newx(q, keylen, char); |
| 2969 | SAVEFREEPV(q); |
| 2970 | keypv = q; |
| 2971 | for (; p != keyend; p++, q++) { |
| 2972 | U8 c = (U8)*p; |
| 2973 | *q = (char) |
| 2974 | ((c & 0x80) ? ((c & 0x03) << 6) | (((U8)*++p) & 0x3f) : c); |
| 2975 | } |
| 2976 | } |
| 2977 | flags &= ~REFCOUNTED_HE_KEY_UTF8; |
| 2978 | canonicalised_key: ; |
| 2979 | } |
| 2980 | utf8_flag = (flags & REFCOUNTED_HE_KEY_UTF8) ? HVhek_UTF8 : 0; |
| 2981 | if (!hash) |
| 2982 | PERL_HASH(hash, keypv, keylen); |
| 2983 | |
| 2984 | for (; chain; chain = chain->refcounted_he_next) { |
| 2985 | if ( |
| 2986 | #ifdef USE_ITHREADS |
| 2987 | hash == chain->refcounted_he_hash && |
| 2988 | keylen == chain->refcounted_he_keylen && |
| 2989 | memEQ(REF_HE_KEY(chain), keypv, keylen) && |
| 2990 | utf8_flag == (chain->refcounted_he_data[0] & HVhek_UTF8) |
| 2991 | #else |
| 2992 | hash == HEK_HASH(chain->refcounted_he_hek) && |
| 2993 | keylen == (STRLEN)HEK_LEN(chain->refcounted_he_hek) && |
| 2994 | memEQ(HEK_KEY(chain->refcounted_he_hek), keypv, keylen) && |
| 2995 | utf8_flag == (HEK_FLAGS(chain->refcounted_he_hek) & HVhek_UTF8) |
| 2996 | #endif |
| 2997 | ) |
| 2998 | return sv_2mortal(refcounted_he_value(chain)); |
| 2999 | } |
| 3000 | return &PL_sv_placeholder; |
| 3001 | } |
| 3002 | |
| 3003 | /* |
| 3004 | =for apidoc m|SV *|refcounted_he_fetch_pv|const struct refcounted_he *chain|const char *key|U32 hash|U32 flags |
| 3005 | |
| 3006 | Like L</refcounted_he_fetch_pvn>, but takes a nul-terminated string |
| 3007 | instead of a string/length pair. |
| 3008 | |
| 3009 | =cut |
| 3010 | */ |
| 3011 | |
| 3012 | SV * |
| 3013 | Perl_refcounted_he_fetch_pv(pTHX_ const struct refcounted_he *chain, |
| 3014 | const char *key, U32 hash, U32 flags) |
| 3015 | { |
| 3016 | PERL_ARGS_ASSERT_REFCOUNTED_HE_FETCH_PV; |
| 3017 | return refcounted_he_fetch_pvn(chain, key, strlen(key), hash, flags); |
| 3018 | } |
| 3019 | |
| 3020 | /* |
| 3021 | =for apidoc m|SV *|refcounted_he_fetch_sv|const struct refcounted_he *chain|SV *key|U32 hash|U32 flags |
| 3022 | |
| 3023 | Like L</refcounted_he_fetch_pvn>, but takes a Perl scalar instead of a |
| 3024 | string/length pair. |
| 3025 | |
| 3026 | =cut |
| 3027 | */ |
| 3028 | |
| 3029 | SV * |
| 3030 | Perl_refcounted_he_fetch_sv(pTHX_ const struct refcounted_he *chain, |
| 3031 | SV *key, U32 hash, U32 flags) |
| 3032 | { |
| 3033 | const char *keypv; |
| 3034 | STRLEN keylen; |
| 3035 | PERL_ARGS_ASSERT_REFCOUNTED_HE_FETCH_SV; |
| 3036 | if (flags & REFCOUNTED_HE_KEY_UTF8) |
| 3037 | Perl_croak(aTHX_ "panic: refcounted_he_fetch_sv bad flags %"UVxf, |
| 3038 | (UV)flags); |
| 3039 | keypv = SvPV_const(key, keylen); |
| 3040 | if (SvUTF8(key)) |
| 3041 | flags |= REFCOUNTED_HE_KEY_UTF8; |
| 3042 | if (!hash && SvIsCOW_shared_hash(key)) |
| 3043 | hash = SvSHARED_HASH(key); |
| 3044 | return refcounted_he_fetch_pvn(chain, keypv, keylen, hash, flags); |
| 3045 | } |
| 3046 | |
| 3047 | /* |
| 3048 | =for apidoc m|struct refcounted_he *|refcounted_he_new_pvn|struct refcounted_he *parent|const char *keypv|STRLEN keylen|U32 hash|SV *value|U32 flags |
| 3049 | |
| 3050 | Creates a new C<refcounted_he>. This consists of a single key/value |
| 3051 | pair and a reference to an existing C<refcounted_he> chain (which may |
| 3052 | be empty), and thus forms a longer chain. When using the longer chain, |
| 3053 | the new key/value pair takes precedence over any entry for the same key |
| 3054 | further along the chain. |
| 3055 | |
| 3056 | The new key is specified by I<keypv> and I<keylen>. If I<flags> has |
| 3057 | the C<REFCOUNTED_HE_KEY_UTF8> bit set, the key octets are interpreted |
| 3058 | as UTF-8, otherwise they are interpreted as Latin-1. I<hash> is |
| 3059 | a precomputed hash of the key string, or zero if it has not been |
| 3060 | precomputed. |
| 3061 | |
| 3062 | I<value> is the scalar value to store for this key. I<value> is copied |
| 3063 | by this function, which thus does not take ownership of any reference |
| 3064 | to it, and later changes to the scalar will not be reflected in the |
| 3065 | value visible in the C<refcounted_he>. Complex types of scalar will not |
| 3066 | be stored with referential integrity, but will be coerced to strings. |
| 3067 | I<value> may be either null or C<&PL_sv_placeholder> to indicate that no |
| 3068 | value is to be associated with the key; this, as with any non-null value, |
| 3069 | takes precedence over the existence of a value for the key further along |
| 3070 | the chain. |
| 3071 | |
| 3072 | I<parent> points to the rest of the C<refcounted_he> chain to be |
| 3073 | attached to the new C<refcounted_he>. This function takes ownership |
| 3074 | of one reference to I<parent>, and returns one reference to the new |
| 3075 | C<refcounted_he>. |
| 3076 | |
| 3077 | =cut |
| 3078 | */ |
| 3079 | |
| 3080 | struct refcounted_he * |
| 3081 | Perl_refcounted_he_new_pvn(pTHX_ struct refcounted_he *parent, |
| 3082 | const char *keypv, STRLEN keylen, U32 hash, SV *value, U32 flags) |
| 3083 | { |
| 3084 | dVAR; |
| 3085 | STRLEN value_len = 0; |
| 3086 | const char *value_p = NULL; |
| 3087 | bool is_pv; |
| 3088 | char value_type; |
| 3089 | char hekflags; |
| 3090 | STRLEN key_offset = 1; |
| 3091 | struct refcounted_he *he; |
| 3092 | PERL_ARGS_ASSERT_REFCOUNTED_HE_NEW_PVN; |
| 3093 | |
| 3094 | if (!value || value == &PL_sv_placeholder) { |
| 3095 | value_type = HVrhek_delete; |
| 3096 | } else if (SvPOK(value)) { |
| 3097 | value_type = HVrhek_PV; |
| 3098 | } else if (SvIOK(value)) { |
| 3099 | value_type = SvUOK((const SV *)value) ? HVrhek_UV : HVrhek_IV; |
| 3100 | } else if (!SvOK(value)) { |
| 3101 | value_type = HVrhek_undef; |
| 3102 | } else { |
| 3103 | value_type = HVrhek_PV; |
| 3104 | } |
| 3105 | is_pv = value_type == HVrhek_PV; |
| 3106 | if (is_pv) { |
| 3107 | /* Do it this way so that the SvUTF8() test is after the SvPV, in case |
| 3108 | the value is overloaded, and doesn't yet have the UTF-8flag set. */ |
| 3109 | value_p = SvPV_const(value, value_len); |
| 3110 | if (SvUTF8(value)) |
| 3111 | value_type = HVrhek_PV_UTF8; |
| 3112 | key_offset = value_len + 2; |
| 3113 | } |
| 3114 | hekflags = value_type; |
| 3115 | |
| 3116 | if (flags & REFCOUNTED_HE_KEY_UTF8) { |
| 3117 | /* Canonicalise to Latin-1 where possible. */ |
| 3118 | const char *keyend = keypv + keylen, *p; |
| 3119 | STRLEN nonascii_count = 0; |
| 3120 | for (p = keypv; p != keyend; p++) { |
| 3121 | U8 c = (U8)*p; |
| 3122 | if (c & 0x80) { |
| 3123 | if (!((c & 0xfe) == 0xc2 && ++p != keyend && |
| 3124 | (((U8)*p) & 0xc0) == 0x80)) |
| 3125 | goto canonicalised_key; |
| 3126 | nonascii_count++; |
| 3127 | } |
| 3128 | } |
| 3129 | if (nonascii_count) { |
| 3130 | char *q; |
| 3131 | const char *p = keypv, *keyend = keypv + keylen; |
| 3132 | keylen -= nonascii_count; |
| 3133 | Newx(q, keylen, char); |
| 3134 | SAVEFREEPV(q); |
| 3135 | keypv = q; |
| 3136 | for (; p != keyend; p++, q++) { |
| 3137 | U8 c = (U8)*p; |
| 3138 | *q = (char) |
| 3139 | ((c & 0x80) ? ((c & 0x03) << 6) | (((U8)*++p) & 0x3f) : c); |
| 3140 | } |
| 3141 | } |
| 3142 | flags &= ~REFCOUNTED_HE_KEY_UTF8; |
| 3143 | canonicalised_key: ; |
| 3144 | } |
| 3145 | if (flags & REFCOUNTED_HE_KEY_UTF8) |
| 3146 | hekflags |= HVhek_UTF8; |
| 3147 | if (!hash) |
| 3148 | PERL_HASH(hash, keypv, keylen); |
| 3149 | |
| 3150 | #ifdef USE_ITHREADS |
| 3151 | he = (struct refcounted_he*) |
| 3152 | PerlMemShared_malloc(sizeof(struct refcounted_he) - 1 |
| 3153 | + keylen |
| 3154 | + key_offset); |
| 3155 | #else |
| 3156 | he = (struct refcounted_he*) |
| 3157 | PerlMemShared_malloc(sizeof(struct refcounted_he) - 1 |
| 3158 | + key_offset); |
| 3159 | #endif |
| 3160 | |
| 3161 | he->refcounted_he_next = parent; |
| 3162 | |
| 3163 | if (is_pv) { |
| 3164 | Copy(value_p, he->refcounted_he_data + 1, value_len + 1, char); |
| 3165 | he->refcounted_he_val.refcounted_he_u_len = value_len; |
| 3166 | } else if (value_type == HVrhek_IV) { |
| 3167 | he->refcounted_he_val.refcounted_he_u_iv = SvIVX(value); |
| 3168 | } else if (value_type == HVrhek_UV) { |
| 3169 | he->refcounted_he_val.refcounted_he_u_uv = SvUVX(value); |
| 3170 | } |
| 3171 | |
| 3172 | #ifdef USE_ITHREADS |
| 3173 | he->refcounted_he_hash = hash; |
| 3174 | he->refcounted_he_keylen = keylen; |
| 3175 | Copy(keypv, he->refcounted_he_data + key_offset, keylen, char); |
| 3176 | #else |
| 3177 | he->refcounted_he_hek = share_hek_flags(keypv, keylen, hash, hekflags); |
| 3178 | #endif |
| 3179 | |
| 3180 | he->refcounted_he_data[0] = hekflags; |
| 3181 | he->refcounted_he_refcnt = 1; |
| 3182 | |
| 3183 | return he; |
| 3184 | } |
| 3185 | |
| 3186 | /* |
| 3187 | =for apidoc m|struct refcounted_he *|refcounted_he_new_pv|struct refcounted_he *parent|const char *key|U32 hash|SV *value|U32 flags |
| 3188 | |
| 3189 | Like L</refcounted_he_new_pvn>, but takes a nul-terminated string instead |
| 3190 | of a string/length pair. |
| 3191 | |
| 3192 | =cut |
| 3193 | */ |
| 3194 | |
| 3195 | struct refcounted_he * |
| 3196 | Perl_refcounted_he_new_pv(pTHX_ struct refcounted_he *parent, |
| 3197 | const char *key, U32 hash, SV *value, U32 flags) |
| 3198 | { |
| 3199 | PERL_ARGS_ASSERT_REFCOUNTED_HE_NEW_PV; |
| 3200 | return refcounted_he_new_pvn(parent, key, strlen(key), hash, value, flags); |
| 3201 | } |
| 3202 | |
| 3203 | /* |
| 3204 | =for apidoc m|struct refcounted_he *|refcounted_he_new_sv|struct refcounted_he *parent|SV *key|U32 hash|SV *value|U32 flags |
| 3205 | |
| 3206 | Like L</refcounted_he_new_pvn>, but takes a Perl scalar instead of a |
| 3207 | string/length pair. |
| 3208 | |
| 3209 | =cut |
| 3210 | */ |
| 3211 | |
| 3212 | struct refcounted_he * |
| 3213 | Perl_refcounted_he_new_sv(pTHX_ struct refcounted_he *parent, |
| 3214 | SV *key, U32 hash, SV *value, U32 flags) |
| 3215 | { |
| 3216 | const char *keypv; |
| 3217 | STRLEN keylen; |
| 3218 | PERL_ARGS_ASSERT_REFCOUNTED_HE_NEW_SV; |
| 3219 | if (flags & REFCOUNTED_HE_KEY_UTF8) |
| 3220 | Perl_croak(aTHX_ "panic: refcounted_he_new_sv bad flags %"UVxf, |
| 3221 | (UV)flags); |
| 3222 | keypv = SvPV_const(key, keylen); |
| 3223 | if (SvUTF8(key)) |
| 3224 | flags |= REFCOUNTED_HE_KEY_UTF8; |
| 3225 | if (!hash && SvIsCOW_shared_hash(key)) |
| 3226 | hash = SvSHARED_HASH(key); |
| 3227 | return refcounted_he_new_pvn(parent, keypv, keylen, hash, value, flags); |
| 3228 | } |
| 3229 | |
| 3230 | /* |
| 3231 | =for apidoc m|void|refcounted_he_free|struct refcounted_he *he |
| 3232 | |
| 3233 | Decrements the reference count of a C<refcounted_he> by one. If the |
| 3234 | reference count reaches zero the structure's memory is freed, which |
| 3235 | (recursively) causes a reduction of its parent C<refcounted_he>'s |
| 3236 | reference count. It is safe to pass a null pointer to this function: |
| 3237 | no action occurs in this case. |
| 3238 | |
| 3239 | =cut |
| 3240 | */ |
| 3241 | |
| 3242 | void |
| 3243 | Perl_refcounted_he_free(pTHX_ struct refcounted_he *he) { |
| 3244 | dVAR; |
| 3245 | PERL_UNUSED_CONTEXT; |
| 3246 | |
| 3247 | while (he) { |
| 3248 | struct refcounted_he *copy; |
| 3249 | U32 new_count; |
| 3250 | |
| 3251 | HINTS_REFCNT_LOCK; |
| 3252 | new_count = --he->refcounted_he_refcnt; |
| 3253 | HINTS_REFCNT_UNLOCK; |
| 3254 | |
| 3255 | if (new_count) { |
| 3256 | return; |
| 3257 | } |
| 3258 | |
| 3259 | #ifndef USE_ITHREADS |
| 3260 | unshare_hek_or_pvn (he->refcounted_he_hek, 0, 0, 0); |
| 3261 | #endif |
| 3262 | copy = he; |
| 3263 | he = he->refcounted_he_next; |
| 3264 | PerlMemShared_free(copy); |
| 3265 | } |
| 3266 | } |
| 3267 | |
| 3268 | /* |
| 3269 | =for apidoc m|struct refcounted_he *|refcounted_he_inc|struct refcounted_he *he |
| 3270 | |
| 3271 | Increment the reference count of a C<refcounted_he>. The pointer to the |
| 3272 | C<refcounted_he> is also returned. It is safe to pass a null pointer |
| 3273 | to this function: no action occurs and a null pointer is returned. |
| 3274 | |
| 3275 | =cut |
| 3276 | */ |
| 3277 | |
| 3278 | struct refcounted_he * |
| 3279 | Perl_refcounted_he_inc(pTHX_ struct refcounted_he *he) |
| 3280 | { |
| 3281 | dVAR; |
| 3282 | if (he) { |
| 3283 | HINTS_REFCNT_LOCK; |
| 3284 | he->refcounted_he_refcnt++; |
| 3285 | HINTS_REFCNT_UNLOCK; |
| 3286 | } |
| 3287 | return he; |
| 3288 | } |
| 3289 | |
| 3290 | /* pp_entereval is aware that labels are stored with a key ':' at the top of |
| 3291 | the linked list. */ |
| 3292 | const char * |
| 3293 | Perl_fetch_cop_label(pTHX_ COP *const cop, STRLEN *len, U32 *flags) { |
| 3294 | struct refcounted_he *const chain = cop->cop_hints_hash; |
| 3295 | |
| 3296 | PERL_ARGS_ASSERT_FETCH_COP_LABEL; |
| 3297 | |
| 3298 | if (!chain) |
| 3299 | return NULL; |
| 3300 | #ifdef USE_ITHREADS |
| 3301 | if (chain->refcounted_he_keylen != 1) |
| 3302 | return NULL; |
| 3303 | if (*REF_HE_KEY(chain) != ':') |
| 3304 | return NULL; |
| 3305 | #else |
| 3306 | if ((STRLEN)HEK_LEN(chain->refcounted_he_hek) != 1) |
| 3307 | return NULL; |
| 3308 | if (*HEK_KEY(chain->refcounted_he_hek) != ':') |
| 3309 | return NULL; |
| 3310 | #endif |
| 3311 | /* Stop anyone trying to really mess us up by adding their own value for |
| 3312 | ':' into %^H */ |
| 3313 | if ((chain->refcounted_he_data[0] & HVrhek_typemask) != HVrhek_PV |
| 3314 | && (chain->refcounted_he_data[0] & HVrhek_typemask) != HVrhek_PV_UTF8) |
| 3315 | return NULL; |
| 3316 | |
| 3317 | if (len) |
| 3318 | *len = chain->refcounted_he_val.refcounted_he_u_len; |
| 3319 | if (flags) { |
| 3320 | *flags = ((chain->refcounted_he_data[0] & HVrhek_typemask) |
| 3321 | == HVrhek_PV_UTF8) ? SVf_UTF8 : 0; |
| 3322 | } |
| 3323 | return chain->refcounted_he_data + 1; |
| 3324 | } |
| 3325 | |
| 3326 | void |
| 3327 | Perl_store_cop_label(pTHX_ COP *const cop, const char *label, STRLEN len, |
| 3328 | U32 flags) |
| 3329 | { |
| 3330 | SV *labelsv; |
| 3331 | PERL_ARGS_ASSERT_STORE_COP_LABEL; |
| 3332 | |
| 3333 | if (flags & ~(SVf_UTF8)) |
| 3334 | Perl_croak(aTHX_ "panic: store_cop_label illegal flag bits 0x%" UVxf, |
| 3335 | (UV)flags); |
| 3336 | labelsv = newSVpvn_flags(label, len, SVs_TEMP); |
| 3337 | if (flags & SVf_UTF8) |
| 3338 | SvUTF8_on(labelsv); |
| 3339 | cop->cop_hints_hash |
| 3340 | = refcounted_he_new_pvs(cop->cop_hints_hash, ":", labelsv, 0); |
| 3341 | } |
| 3342 | |
| 3343 | /* |
| 3344 | =for apidoc hv_assert |
| 3345 | |
| 3346 | Check that a hash is in an internally consistent state. |
| 3347 | |
| 3348 | =cut |
| 3349 | */ |
| 3350 | |
| 3351 | #ifdef DEBUGGING |
| 3352 | |
| 3353 | void |
| 3354 | Perl_hv_assert(pTHX_ HV *hv) |
| 3355 | { |
| 3356 | dVAR; |
| 3357 | HE* entry; |
| 3358 | int withflags = 0; |
| 3359 | int placeholders = 0; |
| 3360 | int real = 0; |
| 3361 | int bad = 0; |
| 3362 | const I32 riter = HvRITER_get(hv); |
| 3363 | HE *eiter = HvEITER_get(hv); |
| 3364 | |
| 3365 | PERL_ARGS_ASSERT_HV_ASSERT; |
| 3366 | |
| 3367 | (void)hv_iterinit(hv); |
| 3368 | |
| 3369 | while ((entry = hv_iternext_flags(hv, HV_ITERNEXT_WANTPLACEHOLDERS))) { |
| 3370 | /* sanity check the values */ |
| 3371 | if (HeVAL(entry) == &PL_sv_placeholder) |
| 3372 | placeholders++; |
| 3373 | else |
| 3374 | real++; |
| 3375 | /* sanity check the keys */ |
| 3376 | if (HeSVKEY(entry)) { |
| 3377 | NOOP; /* Don't know what to check on SV keys. */ |
| 3378 | } else if (HeKUTF8(entry)) { |
| 3379 | withflags++; |
| 3380 | if (HeKWASUTF8(entry)) { |
| 3381 | PerlIO_printf(Perl_debug_log, |
| 3382 | "hash key has both WASUTF8 and UTF8: '%.*s'\n", |
| 3383 | (int) HeKLEN(entry), HeKEY(entry)); |
| 3384 | bad = 1; |
| 3385 | } |
| 3386 | } else if (HeKWASUTF8(entry)) |
| 3387 | withflags++; |
| 3388 | } |
| 3389 | if (!SvTIED_mg((const SV *)hv, PERL_MAGIC_tied)) { |
| 3390 | static const char bad_count[] = "Count %d %s(s), but hash reports %d\n"; |
| 3391 | const int nhashkeys = HvUSEDKEYS(hv); |
| 3392 | const int nhashplaceholders = HvPLACEHOLDERS_get(hv); |
| 3393 | |
| 3394 | if (nhashkeys != real) { |
| 3395 | PerlIO_printf(Perl_debug_log, bad_count, real, "keys", nhashkeys ); |
| 3396 | bad = 1; |
| 3397 | } |
| 3398 | if (nhashplaceholders != placeholders) { |
| 3399 | PerlIO_printf(Perl_debug_log, bad_count, placeholders, "placeholder", nhashplaceholders ); |
| 3400 | bad = 1; |
| 3401 | } |
| 3402 | } |
| 3403 | if (withflags && ! HvHASKFLAGS(hv)) { |
| 3404 | PerlIO_printf(Perl_debug_log, |
| 3405 | "Hash has HASKFLAGS off but I count %d key(s) with flags\n", |
| 3406 | withflags); |
| 3407 | bad = 1; |
| 3408 | } |
| 3409 | if (bad) { |
| 3410 | sv_dump(MUTABLE_SV(hv)); |
| 3411 | } |
| 3412 | HvRITER_set(hv, riter); /* Restore hash iterator state */ |
| 3413 | HvEITER_set(hv, eiter); |
| 3414 | } |
| 3415 | |
| 3416 | #endif |
| 3417 | |
| 3418 | /* |
| 3419 | * Local variables: |
| 3420 | * c-indentation-style: bsd |
| 3421 | * c-basic-offset: 4 |
| 3422 | * indent-tabs-mode: t |
| 3423 | * End: |
| 3424 | * |
| 3425 | * ex: set ts=8 sts=4 sw=4 noet: |
| 3426 | */ |