| 1 | /* av.c |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 4 | * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 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 | * "...for the Entwives desired order, and plenty, and peace (by which they |
| 13 | * meant that things should remain where they had set them)." --Treebeard |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | =head1 Array Manipulation Functions |
| 18 | */ |
| 19 | |
| 20 | #include "EXTERN.h" |
| 21 | #define PERL_IN_AV_C |
| 22 | #include "perl.h" |
| 23 | |
| 24 | void |
| 25 | Perl_av_reify(pTHX_ AV *av) |
| 26 | { |
| 27 | dVAR; |
| 28 | I32 key; |
| 29 | |
| 30 | assert(av); |
| 31 | |
| 32 | if (AvREAL(av)) |
| 33 | return; |
| 34 | #ifdef DEBUGGING |
| 35 | if (SvTIED_mg((SV*)av, PERL_MAGIC_tied) && ckWARN_d(WARN_DEBUGGING)) |
| 36 | Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "av_reify called on tied array"); |
| 37 | #endif |
| 38 | key = AvMAX(av) + 1; |
| 39 | while (key > AvFILLp(av) + 1) |
| 40 | AvARRAY(av)[--key] = &PL_sv_undef; |
| 41 | while (key) { |
| 42 | SV * const sv = AvARRAY(av)[--key]; |
| 43 | assert(sv); |
| 44 | if (sv != &PL_sv_undef) |
| 45 | SvREFCNT_inc_simple_void_NN(sv); |
| 46 | } |
| 47 | key = AvARRAY(av) - AvALLOC(av); |
| 48 | while (key) |
| 49 | AvALLOC(av)[--key] = &PL_sv_undef; |
| 50 | AvREIFY_off(av); |
| 51 | AvREAL_on(av); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | =for apidoc av_extend |
| 56 | |
| 57 | Pre-extend an array. The C<key> is the index to which the array should be |
| 58 | extended. |
| 59 | |
| 60 | =cut |
| 61 | */ |
| 62 | |
| 63 | void |
| 64 | Perl_av_extend(pTHX_ AV *av, I32 key) |
| 65 | { |
| 66 | dVAR; |
| 67 | MAGIC *mg; |
| 68 | |
| 69 | assert(av); |
| 70 | |
| 71 | mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied); |
| 72 | if (mg) { |
| 73 | dSP; |
| 74 | ENTER; |
| 75 | SAVETMPS; |
| 76 | PUSHSTACKi(PERLSI_MAGIC); |
| 77 | PUSHMARK(SP); |
| 78 | EXTEND(SP,2); |
| 79 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 80 | PUSHs(sv_2mortal(newSViv(key+1))); |
| 81 | PUTBACK; |
| 82 | call_method("EXTEND", G_SCALAR|G_DISCARD); |
| 83 | POPSTACK; |
| 84 | FREETMPS; |
| 85 | LEAVE; |
| 86 | return; |
| 87 | } |
| 88 | if (key > AvMAX(av)) { |
| 89 | SV** ary; |
| 90 | I32 tmp; |
| 91 | I32 newmax; |
| 92 | |
| 93 | if (AvALLOC(av) != AvARRAY(av)) { |
| 94 | ary = AvALLOC(av) + AvFILLp(av) + 1; |
| 95 | tmp = AvARRAY(av) - AvALLOC(av); |
| 96 | Move(AvARRAY(av), AvALLOC(av), AvFILLp(av)+1, SV*); |
| 97 | AvMAX(av) += tmp; |
| 98 | SvPV_set(av, (char*)AvALLOC(av)); |
| 99 | if (AvREAL(av)) { |
| 100 | while (tmp) |
| 101 | ary[--tmp] = &PL_sv_undef; |
| 102 | } |
| 103 | if (key > AvMAX(av) - 10) { |
| 104 | newmax = key + AvMAX(av); |
| 105 | goto resize; |
| 106 | } |
| 107 | } |
| 108 | else { |
| 109 | #ifdef PERL_MALLOC_WRAP |
| 110 | static const char oom_array_extend[] = |
| 111 | "Out of memory during array extend"; /* Duplicated in pp_hot.c */ |
| 112 | #endif |
| 113 | |
| 114 | if (AvALLOC(av)) { |
| 115 | #if !defined(STRANGE_MALLOC) && !defined(MYMALLOC) |
| 116 | MEM_SIZE bytes; |
| 117 | IV itmp; |
| 118 | #endif |
| 119 | |
| 120 | #ifdef MYMALLOC |
| 121 | newmax = malloced_size((void*)AvALLOC(av))/sizeof(SV*) - 1; |
| 122 | |
| 123 | if (key <= newmax) |
| 124 | goto resized; |
| 125 | #endif |
| 126 | newmax = key + AvMAX(av) / 5; |
| 127 | resize: |
| 128 | MEM_WRAP_CHECK_1(newmax+1, SV*, oom_array_extend); |
| 129 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
| 130 | Renew(AvALLOC(av),newmax+1, SV*); |
| 131 | #else |
| 132 | bytes = (newmax + 1) * sizeof(SV*); |
| 133 | #define MALLOC_OVERHEAD 16 |
| 134 | itmp = MALLOC_OVERHEAD; |
| 135 | while ((MEM_SIZE)(itmp - MALLOC_OVERHEAD) < bytes) |
| 136 | itmp += itmp; |
| 137 | itmp -= MALLOC_OVERHEAD; |
| 138 | itmp /= sizeof(SV*); |
| 139 | assert(itmp > newmax); |
| 140 | newmax = itmp - 1; |
| 141 | assert(newmax >= AvMAX(av)); |
| 142 | Newx(ary, newmax+1, SV*); |
| 143 | Copy(AvALLOC(av), ary, AvMAX(av)+1, SV*); |
| 144 | if (AvMAX(av) > 64) |
| 145 | offer_nice_chunk(AvALLOC(av), (AvMAX(av)+1) * sizeof(SV*)); |
| 146 | else |
| 147 | Safefree(AvALLOC(av)); |
| 148 | AvALLOC(av) = ary; |
| 149 | #endif |
| 150 | #ifdef MYMALLOC |
| 151 | resized: |
| 152 | #endif |
| 153 | ary = AvALLOC(av) + AvMAX(av) + 1; |
| 154 | tmp = newmax - AvMAX(av); |
| 155 | if (av == PL_curstack) { /* Oops, grew stack (via av_store()?) */ |
| 156 | PL_stack_sp = AvALLOC(av) + (PL_stack_sp - PL_stack_base); |
| 157 | PL_stack_base = AvALLOC(av); |
| 158 | PL_stack_max = PL_stack_base + newmax; |
| 159 | } |
| 160 | } |
| 161 | else { |
| 162 | newmax = key < 3 ? 3 : key; |
| 163 | MEM_WRAP_CHECK_1(newmax+1, SV*, oom_array_extend); |
| 164 | Newx(AvALLOC(av), newmax+1, SV*); |
| 165 | ary = AvALLOC(av) + 1; |
| 166 | tmp = newmax; |
| 167 | AvALLOC(av)[0] = &PL_sv_undef; /* For the stacks */ |
| 168 | } |
| 169 | if (AvREAL(av)) { |
| 170 | while (tmp) |
| 171 | ary[--tmp] = &PL_sv_undef; |
| 172 | } |
| 173 | |
| 174 | SvPV_set(av, (char*)AvALLOC(av)); |
| 175 | AvMAX(av) = newmax; |
| 176 | } |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | =for apidoc av_fetch |
| 182 | |
| 183 | Returns the SV at the specified index in the array. The C<key> is the |
| 184 | index. If C<lval> is set then the fetch will be part of a store. Check |
| 185 | that the return value is non-null before dereferencing it to a C<SV*>. |
| 186 | |
| 187 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for |
| 188 | more information on how to use this function on tied arrays. |
| 189 | |
| 190 | =cut |
| 191 | */ |
| 192 | |
| 193 | SV** |
| 194 | Perl_av_fetch(pTHX_ register AV *av, I32 key, I32 lval) |
| 195 | { |
| 196 | dVAR; |
| 197 | |
| 198 | assert(av); |
| 199 | |
| 200 | if (SvRMAGICAL(av)) { |
| 201 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 202 | if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) { |
| 203 | SV *sv; |
| 204 | if (key < 0) { |
| 205 | I32 adjust_index = 1; |
| 206 | if (tied_magic) { |
| 207 | /* Handle negative array indices 20020222 MJD */ |
| 208 | SV * const * const negative_indices_glob = |
| 209 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, tied_magic))), |
| 210 | NEGATIVE_INDICES_VAR, 16, 0); |
| 211 | |
| 212 | if (negative_indices_glob && SvTRUE(GvSV(*negative_indices_glob))) |
| 213 | adjust_index = 0; |
| 214 | } |
| 215 | |
| 216 | if (adjust_index) { |
| 217 | key += AvFILL(av) + 1; |
| 218 | if (key < 0) |
| 219 | return NULL; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | sv = sv_newmortal(); |
| 224 | sv_upgrade(sv, SVt_PVLV); |
| 225 | mg_copy((SV*)av, sv, 0, key); |
| 226 | LvTYPE(sv) = 't'; |
| 227 | LvTARG(sv) = sv; /* fake (SV**) */ |
| 228 | return &(LvTARG(sv)); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | if (key < 0) { |
| 233 | key += AvFILL(av) + 1; |
| 234 | if (key < 0) |
| 235 | return NULL; |
| 236 | } |
| 237 | |
| 238 | if (key > AvFILLp(av)) { |
| 239 | if (!lval) |
| 240 | return NULL; |
| 241 | return av_store(av,key,newSV(0)); |
| 242 | } |
| 243 | if (AvARRAY(av)[key] == &PL_sv_undef) { |
| 244 | emptyness: |
| 245 | if (lval) |
| 246 | return av_store(av,key,newSV(0)); |
| 247 | return NULL; |
| 248 | } |
| 249 | else if (AvREIFY(av) |
| 250 | && (!AvARRAY(av)[key] /* eg. @_ could have freed elts */ |
| 251 | || SvIS_FREED(AvARRAY(av)[key]))) { |
| 252 | AvARRAY(av)[key] = &PL_sv_undef; /* 1/2 reify */ |
| 253 | goto emptyness; |
| 254 | } |
| 255 | return &AvARRAY(av)[key]; |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | =for apidoc av_store |
| 260 | |
| 261 | Stores an SV in an array. The array index is specified as C<key>. The |
| 262 | return value will be NULL if the operation failed or if the value did not |
| 263 | need to be actually stored within the array (as in the case of tied |
| 264 | arrays). Otherwise it can be dereferenced to get the original C<SV*>. Note |
| 265 | that the caller is responsible for suitably incrementing the reference |
| 266 | count of C<val> before the call, and decrementing it if the function |
| 267 | returned NULL. |
| 268 | |
| 269 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for |
| 270 | more information on how to use this function on tied arrays. |
| 271 | |
| 272 | =cut |
| 273 | */ |
| 274 | |
| 275 | SV** |
| 276 | Perl_av_store(pTHX_ register AV *av, I32 key, SV *val) |
| 277 | { |
| 278 | dVAR; |
| 279 | SV** ary; |
| 280 | |
| 281 | assert(av); |
| 282 | |
| 283 | /* S_regclass relies on being able to pass in a NULL sv |
| 284 | (unicode_alternate may be NULL). |
| 285 | */ |
| 286 | |
| 287 | if (!val) |
| 288 | val = &PL_sv_undef; |
| 289 | |
| 290 | if (SvRMAGICAL(av)) { |
| 291 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 292 | if (tied_magic) { |
| 293 | /* Handle negative array indices 20020222 MJD */ |
| 294 | if (key < 0) { |
| 295 | bool adjust_index = 1; |
| 296 | SV * const * const negative_indices_glob = |
| 297 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, |
| 298 | tied_magic))), |
| 299 | NEGATIVE_INDICES_VAR, 16, 0); |
| 300 | if (negative_indices_glob |
| 301 | && SvTRUE(GvSV(*negative_indices_glob))) |
| 302 | adjust_index = 0; |
| 303 | if (adjust_index) { |
| 304 | key += AvFILL(av) + 1; |
| 305 | if (key < 0) |
| 306 | return 0; |
| 307 | } |
| 308 | } |
| 309 | if (val != &PL_sv_undef) { |
| 310 | mg_copy((SV*)av, val, 0, key); |
| 311 | } |
| 312 | return NULL; |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | |
| 317 | if (key < 0) { |
| 318 | key += AvFILL(av) + 1; |
| 319 | if (key < 0) |
| 320 | return NULL; |
| 321 | } |
| 322 | |
| 323 | if (SvREADONLY(av) && key >= AvFILL(av)) |
| 324 | Perl_croak(aTHX_ PL_no_modify); |
| 325 | |
| 326 | if (!AvREAL(av) && AvREIFY(av)) |
| 327 | av_reify(av); |
| 328 | if (key > AvMAX(av)) |
| 329 | av_extend(av,key); |
| 330 | ary = AvARRAY(av); |
| 331 | if (AvFILLp(av) < key) { |
| 332 | if (!AvREAL(av)) { |
| 333 | if (av == PL_curstack && key > PL_stack_sp - PL_stack_base) |
| 334 | PL_stack_sp = PL_stack_base + key; /* XPUSH in disguise */ |
| 335 | do { |
| 336 | ary[++AvFILLp(av)] = &PL_sv_undef; |
| 337 | } while (AvFILLp(av) < key); |
| 338 | } |
| 339 | AvFILLp(av) = key; |
| 340 | } |
| 341 | else if (AvREAL(av)) |
| 342 | SvREFCNT_dec(ary[key]); |
| 343 | ary[key] = val; |
| 344 | if (SvSMAGICAL(av)) { |
| 345 | if (val != &PL_sv_undef) { |
| 346 | const MAGIC* const mg = SvMAGIC(av); |
| 347 | sv_magic(val, (SV*)av, toLOWER(mg->mg_type), 0, key); |
| 348 | } |
| 349 | mg_set((SV*)av); |
| 350 | } |
| 351 | return &ary[key]; |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | =for apidoc newAV |
| 356 | |
| 357 | Creates a new AV. The reference count is set to 1. |
| 358 | |
| 359 | =cut |
| 360 | */ |
| 361 | |
| 362 | AV * |
| 363 | Perl_newAV(pTHX) |
| 364 | { |
| 365 | register AV * const av = (AV*)newSV(0); |
| 366 | |
| 367 | sv_upgrade((SV *)av, SVt_PVAV); |
| 368 | /* sv_upgrade does AvREAL_only() */ |
| 369 | AvALLOC(av) = 0; |
| 370 | SvPV_set(av, NULL); |
| 371 | AvMAX(av) = AvFILLp(av) = -1; |
| 372 | return av; |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | =for apidoc av_make |
| 377 | |
| 378 | Creates a new AV and populates it with a list of SVs. The SVs are copied |
| 379 | into the array, so they may be freed after the call to av_make. The new AV |
| 380 | will have a reference count of 1. |
| 381 | |
| 382 | =cut |
| 383 | */ |
| 384 | |
| 385 | AV * |
| 386 | Perl_av_make(pTHX_ register I32 size, register SV **strp) |
| 387 | { |
| 388 | register AV * const av = (AV*)newSV(0); |
| 389 | |
| 390 | sv_upgrade((SV *) av,SVt_PVAV); |
| 391 | /* sv_upgrade does AvREAL_only() */ |
| 392 | if (size) { /* "defined" was returning undef for size==0 anyway. */ |
| 393 | register SV** ary; |
| 394 | register I32 i; |
| 395 | Newx(ary,size,SV*); |
| 396 | AvALLOC(av) = ary; |
| 397 | SvPV_set(av, (char*)ary); |
| 398 | AvFILLp(av) = AvMAX(av) = size - 1; |
| 399 | for (i = 0; i < size; i++) { |
| 400 | assert (*strp); |
| 401 | ary[i] = newSV(0); |
| 402 | sv_setsv(ary[i], *strp); |
| 403 | strp++; |
| 404 | } |
| 405 | } |
| 406 | return av; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | =for apidoc av_clear |
| 411 | |
| 412 | Clears an array, making it empty. Does not free the memory used by the |
| 413 | array itself. |
| 414 | |
| 415 | =cut |
| 416 | */ |
| 417 | |
| 418 | void |
| 419 | Perl_av_clear(pTHX_ register AV *av) |
| 420 | { |
| 421 | dVAR; |
| 422 | I32 extra; |
| 423 | |
| 424 | assert(av); |
| 425 | #ifdef DEBUGGING |
| 426 | if (SvREFCNT(av) == 0 && ckWARN_d(WARN_DEBUGGING)) { |
| 427 | Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "Attempt to clear deleted array"); |
| 428 | } |
| 429 | #endif |
| 430 | |
| 431 | if (SvREADONLY(av)) |
| 432 | Perl_croak(aTHX_ PL_no_modify); |
| 433 | |
| 434 | /* Give any tie a chance to cleanup first */ |
| 435 | if (SvRMAGICAL(av)) |
| 436 | mg_clear((SV*)av); |
| 437 | |
| 438 | if (AvMAX(av) < 0) |
| 439 | return; |
| 440 | |
| 441 | if (AvREAL(av)) { |
| 442 | SV** const ary = AvARRAY(av); |
| 443 | I32 index = AvFILLp(av) + 1; |
| 444 | while (index) { |
| 445 | SV * const sv = ary[--index]; |
| 446 | /* undef the slot before freeing the value, because a |
| 447 | * destructor might try to modify this array */ |
| 448 | ary[index] = &PL_sv_undef; |
| 449 | SvREFCNT_dec(sv); |
| 450 | } |
| 451 | } |
| 452 | extra = AvARRAY(av) - AvALLOC(av); |
| 453 | if (extra) { |
| 454 | AvMAX(av) += extra; |
| 455 | SvPV_set(av, (char*)AvALLOC(av)); |
| 456 | } |
| 457 | AvFILLp(av) = -1; |
| 458 | |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | =for apidoc av_undef |
| 463 | |
| 464 | Undefines the array. Frees the memory used by the array itself. |
| 465 | |
| 466 | =cut |
| 467 | */ |
| 468 | |
| 469 | void |
| 470 | Perl_av_undef(pTHX_ register AV *av) |
| 471 | { |
| 472 | assert(av); |
| 473 | |
| 474 | /* Give any tie a chance to cleanup first */ |
| 475 | if (SvTIED_mg((SV*)av, PERL_MAGIC_tied)) |
| 476 | av_fill(av, -1); /* mg_clear() ? */ |
| 477 | |
| 478 | if (AvREAL(av)) { |
| 479 | register I32 key = AvFILLp(av) + 1; |
| 480 | while (key) |
| 481 | SvREFCNT_dec(AvARRAY(av)[--key]); |
| 482 | } |
| 483 | Safefree(AvALLOC(av)); |
| 484 | AvALLOC(av) = NULL; |
| 485 | SvPV_set(av, NULL); |
| 486 | AvMAX(av) = AvFILLp(av) = -1; |
| 487 | } |
| 488 | |
| 489 | /* |
| 490 | =for apidoc av_push |
| 491 | |
| 492 | Pushes an SV onto the end of the array. The array will grow automatically |
| 493 | to accommodate the addition. |
| 494 | |
| 495 | =cut |
| 496 | */ |
| 497 | |
| 498 | void |
| 499 | Perl_av_push(pTHX_ register AV *av, SV *val) |
| 500 | { |
| 501 | dVAR; |
| 502 | MAGIC *mg; |
| 503 | assert(av); |
| 504 | |
| 505 | if (SvREADONLY(av)) |
| 506 | Perl_croak(aTHX_ PL_no_modify); |
| 507 | |
| 508 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 509 | dSP; |
| 510 | PUSHSTACKi(PERLSI_MAGIC); |
| 511 | PUSHMARK(SP); |
| 512 | EXTEND(SP,2); |
| 513 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 514 | PUSHs(val); |
| 515 | PUTBACK; |
| 516 | ENTER; |
| 517 | call_method("PUSH", G_SCALAR|G_DISCARD); |
| 518 | LEAVE; |
| 519 | POPSTACK; |
| 520 | return; |
| 521 | } |
| 522 | av_store(av,AvFILLp(av)+1,val); |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | =for apidoc av_pop |
| 527 | |
| 528 | Pops an SV off the end of the array. Returns C<&PL_sv_undef> if the array |
| 529 | is empty. |
| 530 | |
| 531 | =cut |
| 532 | */ |
| 533 | |
| 534 | SV * |
| 535 | Perl_av_pop(pTHX_ register AV *av) |
| 536 | { |
| 537 | dVAR; |
| 538 | SV *retval; |
| 539 | MAGIC* mg; |
| 540 | |
| 541 | assert(av); |
| 542 | |
| 543 | if (SvREADONLY(av)) |
| 544 | Perl_croak(aTHX_ PL_no_modify); |
| 545 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 546 | dSP; |
| 547 | PUSHSTACKi(PERLSI_MAGIC); |
| 548 | PUSHMARK(SP); |
| 549 | XPUSHs(SvTIED_obj((SV*)av, mg)); |
| 550 | PUTBACK; |
| 551 | ENTER; |
| 552 | if (call_method("POP", G_SCALAR)) { |
| 553 | retval = newSVsv(*PL_stack_sp--); |
| 554 | } else { |
| 555 | retval = &PL_sv_undef; |
| 556 | } |
| 557 | LEAVE; |
| 558 | POPSTACK; |
| 559 | return retval; |
| 560 | } |
| 561 | if (AvFILL(av) < 0) |
| 562 | return &PL_sv_undef; |
| 563 | retval = AvARRAY(av)[AvFILLp(av)]; |
| 564 | AvARRAY(av)[AvFILLp(av)--] = &PL_sv_undef; |
| 565 | if (SvSMAGICAL(av)) |
| 566 | mg_set((SV*)av); |
| 567 | return retval; |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | =for apidoc av_unshift |
| 572 | |
| 573 | Unshift the given number of C<undef> values onto the beginning of the |
| 574 | array. The array will grow automatically to accommodate the addition. You |
| 575 | must then use C<av_store> to assign values to these new elements. |
| 576 | |
| 577 | =cut |
| 578 | */ |
| 579 | |
| 580 | void |
| 581 | Perl_av_unshift(pTHX_ register AV *av, register I32 num) |
| 582 | { |
| 583 | dVAR; |
| 584 | register I32 i; |
| 585 | MAGIC* mg; |
| 586 | |
| 587 | assert(av); |
| 588 | |
| 589 | if (SvREADONLY(av)) |
| 590 | Perl_croak(aTHX_ PL_no_modify); |
| 591 | |
| 592 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 593 | dSP; |
| 594 | PUSHSTACKi(PERLSI_MAGIC); |
| 595 | PUSHMARK(SP); |
| 596 | EXTEND(SP,1+num); |
| 597 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 598 | while (num-- > 0) { |
| 599 | PUSHs(&PL_sv_undef); |
| 600 | } |
| 601 | PUTBACK; |
| 602 | ENTER; |
| 603 | call_method("UNSHIFT", G_SCALAR|G_DISCARD); |
| 604 | LEAVE; |
| 605 | POPSTACK; |
| 606 | return; |
| 607 | } |
| 608 | |
| 609 | if (num <= 0) |
| 610 | return; |
| 611 | if (!AvREAL(av) && AvREIFY(av)) |
| 612 | av_reify(av); |
| 613 | i = AvARRAY(av) - AvALLOC(av); |
| 614 | if (i) { |
| 615 | if (i > num) |
| 616 | i = num; |
| 617 | num -= i; |
| 618 | |
| 619 | AvMAX(av) += i; |
| 620 | AvFILLp(av) += i; |
| 621 | SvPV_set(av, (char*)(AvARRAY(av) - i)); |
| 622 | } |
| 623 | if (num) { |
| 624 | register SV **ary; |
| 625 | I32 slide; |
| 626 | i = AvFILLp(av); |
| 627 | /* Create extra elements */ |
| 628 | slide = i > 0 ? i : 0; |
| 629 | num += slide; |
| 630 | av_extend(av, i + num); |
| 631 | AvFILLp(av) += num; |
| 632 | ary = AvARRAY(av); |
| 633 | Move(ary, ary + num, i + 1, SV*); |
| 634 | do { |
| 635 | ary[--num] = &PL_sv_undef; |
| 636 | } while (num); |
| 637 | /* Make extra elements into a buffer */ |
| 638 | AvMAX(av) -= slide; |
| 639 | AvFILLp(av) -= slide; |
| 640 | SvPV_set(av, (char*)(AvARRAY(av) + slide)); |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | /* |
| 645 | =for apidoc av_shift |
| 646 | |
| 647 | Shifts an SV off the beginning of the array. |
| 648 | |
| 649 | =cut |
| 650 | */ |
| 651 | |
| 652 | SV * |
| 653 | Perl_av_shift(pTHX_ register AV *av) |
| 654 | { |
| 655 | dVAR; |
| 656 | SV *retval; |
| 657 | MAGIC* mg; |
| 658 | |
| 659 | assert(av); |
| 660 | |
| 661 | if (SvREADONLY(av)) |
| 662 | Perl_croak(aTHX_ PL_no_modify); |
| 663 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 664 | dSP; |
| 665 | PUSHSTACKi(PERLSI_MAGIC); |
| 666 | PUSHMARK(SP); |
| 667 | XPUSHs(SvTIED_obj((SV*)av, mg)); |
| 668 | PUTBACK; |
| 669 | ENTER; |
| 670 | if (call_method("SHIFT", G_SCALAR)) { |
| 671 | retval = newSVsv(*PL_stack_sp--); |
| 672 | } else { |
| 673 | retval = &PL_sv_undef; |
| 674 | } |
| 675 | LEAVE; |
| 676 | POPSTACK; |
| 677 | return retval; |
| 678 | } |
| 679 | if (AvFILL(av) < 0) |
| 680 | return &PL_sv_undef; |
| 681 | retval = *AvARRAY(av); |
| 682 | if (AvREAL(av)) |
| 683 | *AvARRAY(av) = &PL_sv_undef; |
| 684 | SvPV_set(av, (char*)(AvARRAY(av) + 1)); |
| 685 | AvMAX(av)--; |
| 686 | AvFILLp(av)--; |
| 687 | if (SvSMAGICAL(av)) |
| 688 | mg_set((SV*)av); |
| 689 | return retval; |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | =for apidoc av_len |
| 694 | |
| 695 | Returns the highest index in the array. Returns -1 if the array is |
| 696 | empty. |
| 697 | |
| 698 | =cut |
| 699 | */ |
| 700 | |
| 701 | I32 |
| 702 | Perl_av_len(pTHX_ register const AV *av) |
| 703 | { |
| 704 | assert(av); |
| 705 | return AvFILL(av); |
| 706 | } |
| 707 | |
| 708 | /* |
| 709 | =for apidoc av_fill |
| 710 | |
| 711 | Ensure than an array has a given number of elements, equivalent to |
| 712 | Perl's C<$#array = $fill;>. |
| 713 | |
| 714 | =cut |
| 715 | */ |
| 716 | void |
| 717 | Perl_av_fill(pTHX_ register AV *av, I32 fill) |
| 718 | { |
| 719 | dVAR; |
| 720 | MAGIC *mg; |
| 721 | |
| 722 | assert(av); |
| 723 | |
| 724 | if (fill < 0) |
| 725 | fill = -1; |
| 726 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 727 | dSP; |
| 728 | ENTER; |
| 729 | SAVETMPS; |
| 730 | PUSHSTACKi(PERLSI_MAGIC); |
| 731 | PUSHMARK(SP); |
| 732 | EXTEND(SP,2); |
| 733 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 734 | PUSHs(sv_2mortal(newSViv(fill+1))); |
| 735 | PUTBACK; |
| 736 | call_method("STORESIZE", G_SCALAR|G_DISCARD); |
| 737 | POPSTACK; |
| 738 | FREETMPS; |
| 739 | LEAVE; |
| 740 | return; |
| 741 | } |
| 742 | if (fill <= AvMAX(av)) { |
| 743 | I32 key = AvFILLp(av); |
| 744 | SV** const ary = AvARRAY(av); |
| 745 | |
| 746 | if (AvREAL(av)) { |
| 747 | while (key > fill) { |
| 748 | SvREFCNT_dec(ary[key]); |
| 749 | ary[key--] = &PL_sv_undef; |
| 750 | } |
| 751 | } |
| 752 | else { |
| 753 | while (key < fill) |
| 754 | ary[++key] = &PL_sv_undef; |
| 755 | } |
| 756 | |
| 757 | AvFILLp(av) = fill; |
| 758 | if (SvSMAGICAL(av)) |
| 759 | mg_set((SV*)av); |
| 760 | } |
| 761 | else |
| 762 | (void)av_store(av,fill,&PL_sv_undef); |
| 763 | } |
| 764 | |
| 765 | /* |
| 766 | =for apidoc av_delete |
| 767 | |
| 768 | Deletes the element indexed by C<key> from the array. Returns the |
| 769 | deleted element. If C<flags> equals C<G_DISCARD>, the element is freed |
| 770 | and null is returned. |
| 771 | |
| 772 | =cut |
| 773 | */ |
| 774 | SV * |
| 775 | Perl_av_delete(pTHX_ AV *av, I32 key, I32 flags) |
| 776 | { |
| 777 | dVAR; |
| 778 | SV *sv; |
| 779 | |
| 780 | assert(av); |
| 781 | |
| 782 | if (SvREADONLY(av)) |
| 783 | Perl_croak(aTHX_ PL_no_modify); |
| 784 | |
| 785 | if (SvRMAGICAL(av)) { |
| 786 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 787 | if ((tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata))) { |
| 788 | /* Handle negative array indices 20020222 MJD */ |
| 789 | SV **svp; |
| 790 | if (key < 0) { |
| 791 | unsigned adjust_index = 1; |
| 792 | if (tied_magic) { |
| 793 | SV * const * const negative_indices_glob = |
| 794 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, |
| 795 | tied_magic))), |
| 796 | NEGATIVE_INDICES_VAR, 16, 0); |
| 797 | if (negative_indices_glob |
| 798 | && SvTRUE(GvSV(*negative_indices_glob))) |
| 799 | adjust_index = 0; |
| 800 | } |
| 801 | if (adjust_index) { |
| 802 | key += AvFILL(av) + 1; |
| 803 | if (key < 0) |
| 804 | return NULL; |
| 805 | } |
| 806 | } |
| 807 | svp = av_fetch(av, key, TRUE); |
| 808 | if (svp) { |
| 809 | sv = *svp; |
| 810 | mg_clear(sv); |
| 811 | if (mg_find(sv, PERL_MAGIC_tiedelem)) { |
| 812 | sv_unmagic(sv, PERL_MAGIC_tiedelem); /* No longer an element */ |
| 813 | return sv; |
| 814 | } |
| 815 | return NULL; |
| 816 | } |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | if (key < 0) { |
| 821 | key += AvFILL(av) + 1; |
| 822 | if (key < 0) |
| 823 | return NULL; |
| 824 | } |
| 825 | |
| 826 | if (key > AvFILLp(av)) |
| 827 | return NULL; |
| 828 | else { |
| 829 | if (!AvREAL(av) && AvREIFY(av)) |
| 830 | av_reify(av); |
| 831 | sv = AvARRAY(av)[key]; |
| 832 | if (key == AvFILLp(av)) { |
| 833 | AvARRAY(av)[key] = &PL_sv_undef; |
| 834 | do { |
| 835 | AvFILLp(av)--; |
| 836 | } while (--key >= 0 && AvARRAY(av)[key] == &PL_sv_undef); |
| 837 | } |
| 838 | else |
| 839 | AvARRAY(av)[key] = &PL_sv_undef; |
| 840 | if (SvSMAGICAL(av)) |
| 841 | mg_set((SV*)av); |
| 842 | } |
| 843 | if (flags & G_DISCARD) { |
| 844 | SvREFCNT_dec(sv); |
| 845 | sv = NULL; |
| 846 | } |
| 847 | else if (AvREAL(av)) |
| 848 | sv = sv_2mortal(sv); |
| 849 | return sv; |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | =for apidoc av_exists |
| 854 | |
| 855 | Returns true if the element indexed by C<key> has been initialized. |
| 856 | |
| 857 | This relies on the fact that uninitialized array elements are set to |
| 858 | C<&PL_sv_undef>. |
| 859 | |
| 860 | =cut |
| 861 | */ |
| 862 | bool |
| 863 | Perl_av_exists(pTHX_ AV *av, I32 key) |
| 864 | { |
| 865 | dVAR; |
| 866 | assert(av); |
| 867 | |
| 868 | if (SvRMAGICAL(av)) { |
| 869 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 870 | if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) { |
| 871 | SV * const sv = sv_newmortal(); |
| 872 | MAGIC *mg; |
| 873 | /* Handle negative array indices 20020222 MJD */ |
| 874 | if (key < 0) { |
| 875 | unsigned adjust_index = 1; |
| 876 | if (tied_magic) { |
| 877 | SV * const * const negative_indices_glob = |
| 878 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, |
| 879 | tied_magic))), |
| 880 | NEGATIVE_INDICES_VAR, 16, 0); |
| 881 | if (negative_indices_glob |
| 882 | && SvTRUE(GvSV(*negative_indices_glob))) |
| 883 | adjust_index = 0; |
| 884 | } |
| 885 | if (adjust_index) { |
| 886 | key += AvFILL(av) + 1; |
| 887 | if (key < 0) |
| 888 | return FALSE; |
| 889 | } |
| 890 | } |
| 891 | |
| 892 | mg_copy((SV*)av, sv, 0, key); |
| 893 | mg = mg_find(sv, PERL_MAGIC_tiedelem); |
| 894 | if (mg) { |
| 895 | magic_existspack(sv, mg); |
| 896 | return (bool)SvTRUE(sv); |
| 897 | } |
| 898 | |
| 899 | } |
| 900 | } |
| 901 | |
| 902 | if (key < 0) { |
| 903 | key += AvFILL(av) + 1; |
| 904 | if (key < 0) |
| 905 | return FALSE; |
| 906 | } |
| 907 | |
| 908 | if (key <= AvFILLp(av) && AvARRAY(av)[key] != &PL_sv_undef |
| 909 | && AvARRAY(av)[key]) |
| 910 | { |
| 911 | return TRUE; |
| 912 | } |
| 913 | else |
| 914 | return FALSE; |
| 915 | } |
| 916 | |
| 917 | SV ** |
| 918 | Perl_av_arylen_p(pTHX_ AV *av) { |
| 919 | dVAR; |
| 920 | MAGIC *mg; |
| 921 | |
| 922 | assert(av); |
| 923 | |
| 924 | mg = mg_find((SV*)av, PERL_MAGIC_arylen_p); |
| 925 | |
| 926 | if (!mg) { |
| 927 | mg = sv_magicext((SV*)av, 0, PERL_MAGIC_arylen_p, &PL_vtbl_arylen_p, |
| 928 | 0, 0); |
| 929 | assert(mg); |
| 930 | /* sv_magicext won't set this for us because we pass in a NULL obj */ |
| 931 | mg->mg_flags |= MGf_REFCOUNTED; |
| 932 | } |
| 933 | return &(mg->mg_obj); |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | * Local variables: |
| 938 | * c-indentation-style: bsd |
| 939 | * c-basic-offset: 4 |
| 940 | * indent-tabs-mode: t |
| 941 | * End: |
| 942 | * |
| 943 | * ex: set ts=8 sts=4 sw=4 noet: |
| 944 | */ |