| 1 | /* av.c |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
| 4 | * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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 | PERL_ARGS_ASSERT_AV_REIFY; |
| 31 | assert(SvTYPE(av) == SVt_PVAV); |
| 32 | |
| 33 | if (AvREAL(av)) |
| 34 | return; |
| 35 | #ifdef DEBUGGING |
| 36 | if (SvTIED_mg((SV*)av, PERL_MAGIC_tied) && ckWARN_d(WARN_DEBUGGING)) |
| 37 | Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "av_reify called on tied array"); |
| 38 | #endif |
| 39 | key = AvMAX(av) + 1; |
| 40 | while (key > AvFILLp(av) + 1) |
| 41 | AvARRAY(av)[--key] = &PL_sv_undef; |
| 42 | while (key) { |
| 43 | SV * const sv = AvARRAY(av)[--key]; |
| 44 | assert(sv); |
| 45 | if (sv != &PL_sv_undef) |
| 46 | SvREFCNT_inc_simple_void_NN(sv); |
| 47 | } |
| 48 | key = AvARRAY(av) - AvALLOC(av); |
| 49 | while (key) |
| 50 | AvALLOC(av)[--key] = &PL_sv_undef; |
| 51 | AvREIFY_off(av); |
| 52 | AvREAL_on(av); |
| 53 | } |
| 54 | |
| 55 | /* |
| 56 | =for apidoc av_extend |
| 57 | |
| 58 | Pre-extend an array. The C<key> is the index to which the array should be |
| 59 | extended. |
| 60 | |
| 61 | =cut |
| 62 | */ |
| 63 | |
| 64 | void |
| 65 | Perl_av_extend(pTHX_ AV *av, I32 key) |
| 66 | { |
| 67 | dVAR; |
| 68 | MAGIC *mg; |
| 69 | |
| 70 | PERL_ARGS_ASSERT_AV_EXTEND; |
| 71 | assert(SvTYPE(av) == SVt_PVAV); |
| 72 | |
| 73 | mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied); |
| 74 | if (mg) { |
| 75 | dSP; |
| 76 | ENTER; |
| 77 | SAVETMPS; |
| 78 | PUSHSTACKi(PERLSI_MAGIC); |
| 79 | PUSHMARK(SP); |
| 80 | EXTEND(SP,2); |
| 81 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 82 | mPUSHi(key + 1); |
| 83 | PUTBACK; |
| 84 | call_method("EXTEND", G_SCALAR|G_DISCARD); |
| 85 | POPSTACK; |
| 86 | FREETMPS; |
| 87 | LEAVE; |
| 88 | return; |
| 89 | } |
| 90 | if (key > AvMAX(av)) { |
| 91 | SV** ary; |
| 92 | I32 tmp; |
| 93 | I32 newmax; |
| 94 | |
| 95 | if (AvALLOC(av) != AvARRAY(av)) { |
| 96 | ary = AvALLOC(av) + AvFILLp(av) + 1; |
| 97 | tmp = AvARRAY(av) - AvALLOC(av); |
| 98 | Move(AvARRAY(av), AvALLOC(av), AvFILLp(av)+1, SV*); |
| 99 | AvMAX(av) += tmp; |
| 100 | AvARRAY(av) = AvALLOC(av); |
| 101 | if (AvREAL(av)) { |
| 102 | while (tmp) |
| 103 | ary[--tmp] = &PL_sv_undef; |
| 104 | } |
| 105 | if (key > AvMAX(av) - 10) { |
| 106 | newmax = key + AvMAX(av); |
| 107 | goto resize; |
| 108 | } |
| 109 | } |
| 110 | else { |
| 111 | #ifdef PERL_MALLOC_WRAP |
| 112 | static const char oom_array_extend[] = |
| 113 | "Out of memory during array extend"; /* Duplicated in pp_hot.c */ |
| 114 | #endif |
| 115 | |
| 116 | if (AvALLOC(av)) { |
| 117 | #if !defined(STRANGE_MALLOC) && !defined(MYMALLOC) |
| 118 | MEM_SIZE bytes; |
| 119 | IV itmp; |
| 120 | #endif |
| 121 | |
| 122 | #ifdef Perl_safesysmalloc_size |
| 123 | /* Whilst it would be quite possible to move this logic around |
| 124 | (as I did in the SV code), so as to set AvMAX(av) early, |
| 125 | based on calling Perl_safesysmalloc_size() immediately after |
| 126 | allocation, I'm not convinced that it is a great idea here. |
| 127 | In an array we have to loop round setting everything to |
| 128 | &PL_sv_undef, which means writing to memory, potentially lots |
| 129 | of it, whereas for the SV buffer case we don't touch the |
| 130 | "bonus" memory. So there there is no cost in telling the |
| 131 | world about it, whereas here we have to do work before we can |
| 132 | tell the world about it, and that work involves writing to |
| 133 | memory that might never be read. So, I feel, better to keep |
| 134 | the current lazy system of only writing to it if our caller |
| 135 | has a need for more space. NWC */ |
| 136 | newmax = Perl_safesysmalloc_size((void*)AvALLOC(av)) / |
| 137 | sizeof(SV*) - 1; |
| 138 | |
| 139 | if (key <= newmax) |
| 140 | goto resized; |
| 141 | #endif |
| 142 | newmax = key + AvMAX(av) / 5; |
| 143 | resize: |
| 144 | MEM_WRAP_CHECK_1(newmax+1, SV*, oom_array_extend); |
| 145 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
| 146 | Renew(AvALLOC(av),newmax+1, SV*); |
| 147 | #else |
| 148 | bytes = (newmax + 1) * sizeof(SV*); |
| 149 | #define MALLOC_OVERHEAD 16 |
| 150 | itmp = MALLOC_OVERHEAD; |
| 151 | while ((MEM_SIZE)(itmp - MALLOC_OVERHEAD) < bytes) |
| 152 | itmp += itmp; |
| 153 | itmp -= MALLOC_OVERHEAD; |
| 154 | itmp /= sizeof(SV*); |
| 155 | assert(itmp > newmax); |
| 156 | newmax = itmp - 1; |
| 157 | assert(newmax >= AvMAX(av)); |
| 158 | Newx(ary, newmax+1, SV*); |
| 159 | Copy(AvALLOC(av), ary, AvMAX(av)+1, SV*); |
| 160 | if (AvMAX(av) > 64) |
| 161 | offer_nice_chunk(AvALLOC(av), (AvMAX(av)+1) * sizeof(SV*)); |
| 162 | else |
| 163 | Safefree(AvALLOC(av)); |
| 164 | AvALLOC(av) = ary; |
| 165 | #endif |
| 166 | #ifdef Perl_safesysmalloc_size |
| 167 | resized: |
| 168 | #endif |
| 169 | ary = AvALLOC(av) + AvMAX(av) + 1; |
| 170 | tmp = newmax - AvMAX(av); |
| 171 | if (av == PL_curstack) { /* Oops, grew stack (via av_store()?) */ |
| 172 | PL_stack_sp = AvALLOC(av) + (PL_stack_sp - PL_stack_base); |
| 173 | PL_stack_base = AvALLOC(av); |
| 174 | PL_stack_max = PL_stack_base + newmax; |
| 175 | } |
| 176 | } |
| 177 | else { |
| 178 | newmax = key < 3 ? 3 : key; |
| 179 | MEM_WRAP_CHECK_1(newmax+1, SV*, oom_array_extend); |
| 180 | Newx(AvALLOC(av), newmax+1, SV*); |
| 181 | ary = AvALLOC(av) + 1; |
| 182 | tmp = newmax; |
| 183 | AvALLOC(av)[0] = &PL_sv_undef; /* For the stacks */ |
| 184 | } |
| 185 | if (AvREAL(av)) { |
| 186 | while (tmp) |
| 187 | ary[--tmp] = &PL_sv_undef; |
| 188 | } |
| 189 | |
| 190 | AvARRAY(av) = AvALLOC(av); |
| 191 | AvMAX(av) = newmax; |
| 192 | } |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | =for apidoc av_fetch |
| 198 | |
| 199 | Returns the SV at the specified index in the array. The C<key> is the |
| 200 | index. If C<lval> is set then the fetch will be part of a store. Check |
| 201 | that the return value is non-null before dereferencing it to a C<SV*>. |
| 202 | |
| 203 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for |
| 204 | more information on how to use this function on tied arrays. |
| 205 | |
| 206 | =cut |
| 207 | */ |
| 208 | |
| 209 | SV** |
| 210 | Perl_av_fetch(pTHX_ register AV *av, I32 key, I32 lval) |
| 211 | { |
| 212 | dVAR; |
| 213 | |
| 214 | PERL_ARGS_ASSERT_AV_FETCH; |
| 215 | assert(SvTYPE(av) == SVt_PVAV); |
| 216 | |
| 217 | if (SvRMAGICAL(av)) { |
| 218 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 219 | if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) { |
| 220 | SV *sv; |
| 221 | if (key < 0) { |
| 222 | I32 adjust_index = 1; |
| 223 | if (tied_magic) { |
| 224 | /* Handle negative array indices 20020222 MJD */ |
| 225 | SV * const * const negative_indices_glob = |
| 226 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, tied_magic))), |
| 227 | NEGATIVE_INDICES_VAR, 16, 0); |
| 228 | |
| 229 | if (negative_indices_glob && SvTRUE(GvSV(*negative_indices_glob))) |
| 230 | adjust_index = 0; |
| 231 | } |
| 232 | |
| 233 | if (adjust_index) { |
| 234 | key += AvFILL(av) + 1; |
| 235 | if (key < 0) |
| 236 | return NULL; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | sv = sv_newmortal(); |
| 241 | sv_upgrade(sv, SVt_PVLV); |
| 242 | mg_copy((SV*)av, sv, 0, key); |
| 243 | LvTYPE(sv) = 't'; |
| 244 | LvTARG(sv) = sv; /* fake (SV**) */ |
| 245 | return &(LvTARG(sv)); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | if (key < 0) { |
| 250 | key += AvFILL(av) + 1; |
| 251 | if (key < 0) |
| 252 | return NULL; |
| 253 | } |
| 254 | |
| 255 | if (key > AvFILLp(av)) { |
| 256 | if (!lval) |
| 257 | return NULL; |
| 258 | return av_store(av,key,newSV(0)); |
| 259 | } |
| 260 | if (AvARRAY(av)[key] == &PL_sv_undef) { |
| 261 | emptyness: |
| 262 | if (lval) |
| 263 | return av_store(av,key,newSV(0)); |
| 264 | return NULL; |
| 265 | } |
| 266 | else if (AvREIFY(av) |
| 267 | && (!AvARRAY(av)[key] /* eg. @_ could have freed elts */ |
| 268 | || SvIS_FREED(AvARRAY(av)[key]))) { |
| 269 | AvARRAY(av)[key] = &PL_sv_undef; /* 1/2 reify */ |
| 270 | goto emptyness; |
| 271 | } |
| 272 | return &AvARRAY(av)[key]; |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | =for apidoc av_store |
| 277 | |
| 278 | Stores an SV in an array. The array index is specified as C<key>. The |
| 279 | return value will be NULL if the operation failed or if the value did not |
| 280 | need to be actually stored within the array (as in the case of tied |
| 281 | arrays). Otherwise it can be dereferenced to get the original C<SV*>. Note |
| 282 | that the caller is responsible for suitably incrementing the reference |
| 283 | count of C<val> before the call, and decrementing it if the function |
| 284 | returned NULL. |
| 285 | |
| 286 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for |
| 287 | more information on how to use this function on tied arrays. |
| 288 | |
| 289 | =cut |
| 290 | */ |
| 291 | |
| 292 | SV** |
| 293 | Perl_av_store(pTHX_ register AV *av, I32 key, SV *val) |
| 294 | { |
| 295 | dVAR; |
| 296 | SV** ary; |
| 297 | |
| 298 | PERL_ARGS_ASSERT_AV_STORE; |
| 299 | assert(SvTYPE(av) == SVt_PVAV); |
| 300 | |
| 301 | /* S_regclass relies on being able to pass in a NULL sv |
| 302 | (unicode_alternate may be NULL). |
| 303 | */ |
| 304 | |
| 305 | if (!val) |
| 306 | val = &PL_sv_undef; |
| 307 | |
| 308 | if (SvRMAGICAL(av)) { |
| 309 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 310 | if (tied_magic) { |
| 311 | /* Handle negative array indices 20020222 MJD */ |
| 312 | if (key < 0) { |
| 313 | bool adjust_index = 1; |
| 314 | SV * const * const negative_indices_glob = |
| 315 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, |
| 316 | tied_magic))), |
| 317 | NEGATIVE_INDICES_VAR, 16, 0); |
| 318 | if (negative_indices_glob |
| 319 | && SvTRUE(GvSV(*negative_indices_glob))) |
| 320 | adjust_index = 0; |
| 321 | if (adjust_index) { |
| 322 | key += AvFILL(av) + 1; |
| 323 | if (key < 0) |
| 324 | return 0; |
| 325 | } |
| 326 | } |
| 327 | if (val != &PL_sv_undef) { |
| 328 | mg_copy((SV*)av, val, 0, key); |
| 329 | } |
| 330 | return NULL; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | |
| 335 | if (key < 0) { |
| 336 | key += AvFILL(av) + 1; |
| 337 | if (key < 0) |
| 338 | return NULL; |
| 339 | } |
| 340 | |
| 341 | if (SvREADONLY(av) && key >= AvFILL(av)) |
| 342 | Perl_croak(aTHX_ PL_no_modify); |
| 343 | |
| 344 | if (!AvREAL(av) && AvREIFY(av)) |
| 345 | av_reify(av); |
| 346 | if (key > AvMAX(av)) |
| 347 | av_extend(av,key); |
| 348 | ary = AvARRAY(av); |
| 349 | if (AvFILLp(av) < key) { |
| 350 | if (!AvREAL(av)) { |
| 351 | if (av == PL_curstack && key > PL_stack_sp - PL_stack_base) |
| 352 | PL_stack_sp = PL_stack_base + key; /* XPUSH in disguise */ |
| 353 | do { |
| 354 | ary[++AvFILLp(av)] = &PL_sv_undef; |
| 355 | } while (AvFILLp(av) < key); |
| 356 | } |
| 357 | AvFILLp(av) = key; |
| 358 | } |
| 359 | else if (AvREAL(av)) |
| 360 | SvREFCNT_dec(ary[key]); |
| 361 | ary[key] = val; |
| 362 | if (SvSMAGICAL(av)) { |
| 363 | const MAGIC* const mg = SvMAGIC(av); |
| 364 | if (val != &PL_sv_undef) { |
| 365 | sv_magic(val, (SV*)av, toLOWER(mg->mg_type), 0, key); |
| 366 | } |
| 367 | if (PL_delaymagic && mg->mg_type == PERL_MAGIC_isa) |
| 368 | PL_delaymagic |= DM_ARRAY; |
| 369 | else |
| 370 | mg_set((SV*)av); |
| 371 | } |
| 372 | return &ary[key]; |
| 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_type(SVt_PVAV); |
| 389 | /* sv_upgrade does AvREAL_only() */ |
| 390 | PERL_ARGS_ASSERT_AV_MAKE; |
| 391 | assert(SvTYPE(av) == SVt_PVAV); |
| 392 | |
| 393 | if (size) { /* "defined" was returning undef for size==0 anyway. */ |
| 394 | register SV** ary; |
| 395 | register I32 i; |
| 396 | Newx(ary,size,SV*); |
| 397 | AvALLOC(av) = ary; |
| 398 | AvARRAY(av) = ary; |
| 399 | AvFILLp(av) = AvMAX(av) = size - 1; |
| 400 | for (i = 0; i < size; i++) { |
| 401 | assert (*strp); |
| 402 | ary[i] = newSV(0); |
| 403 | sv_setsv(ary[i], *strp); |
| 404 | strp++; |
| 405 | } |
| 406 | } |
| 407 | return av; |
| 408 | } |
| 409 | |
| 410 | /* |
| 411 | =for apidoc av_clear |
| 412 | |
| 413 | Clears an array, making it empty. Does not free the memory used by the |
| 414 | array itself. |
| 415 | |
| 416 | =cut |
| 417 | */ |
| 418 | |
| 419 | void |
| 420 | Perl_av_clear(pTHX_ register AV *av) |
| 421 | { |
| 422 | dVAR; |
| 423 | I32 extra; |
| 424 | |
| 425 | PERL_ARGS_ASSERT_AV_CLEAR; |
| 426 | assert(SvTYPE(av) == SVt_PVAV); |
| 427 | |
| 428 | #ifdef DEBUGGING |
| 429 | if (SvREFCNT(av) == 0 && ckWARN_d(WARN_DEBUGGING)) { |
| 430 | Perl_warner(aTHX_ packWARN(WARN_DEBUGGING), "Attempt to clear deleted array"); |
| 431 | } |
| 432 | #endif |
| 433 | |
| 434 | if (SvREADONLY(av)) |
| 435 | Perl_croak(aTHX_ PL_no_modify); |
| 436 | |
| 437 | /* Give any tie a chance to cleanup first */ |
| 438 | if (SvRMAGICAL(av)) { |
| 439 | const MAGIC* const mg = SvMAGIC(av); |
| 440 | if (PL_delaymagic && mg && mg->mg_type == PERL_MAGIC_isa) |
| 441 | PL_delaymagic |= DM_ARRAY; |
| 442 | else |
| 443 | mg_clear((SV*)av); |
| 444 | } |
| 445 | |
| 446 | if (AvMAX(av) < 0) |
| 447 | return; |
| 448 | |
| 449 | if (AvREAL(av)) { |
| 450 | SV** const ary = AvARRAY(av); |
| 451 | I32 index = AvFILLp(av) + 1; |
| 452 | while (index) { |
| 453 | SV * const sv = ary[--index]; |
| 454 | /* undef the slot before freeing the value, because a |
| 455 | * destructor might try to modify this array */ |
| 456 | ary[index] = &PL_sv_undef; |
| 457 | SvREFCNT_dec(sv); |
| 458 | } |
| 459 | } |
| 460 | extra = AvARRAY(av) - AvALLOC(av); |
| 461 | if (extra) { |
| 462 | AvMAX(av) += extra; |
| 463 | AvARRAY(av) = AvALLOC(av); |
| 464 | } |
| 465 | AvFILLp(av) = -1; |
| 466 | |
| 467 | } |
| 468 | |
| 469 | /* |
| 470 | =for apidoc av_undef |
| 471 | |
| 472 | Undefines the array. Frees the memory used by the array itself. |
| 473 | |
| 474 | =cut |
| 475 | */ |
| 476 | |
| 477 | void |
| 478 | Perl_av_undef(pTHX_ register AV *av) |
| 479 | { |
| 480 | PERL_ARGS_ASSERT_AV_UNDEF; |
| 481 | assert(SvTYPE(av) == SVt_PVAV); |
| 482 | |
| 483 | /* Give any tie a chance to cleanup first */ |
| 484 | if (SvTIED_mg((SV*)av, PERL_MAGIC_tied)) |
| 485 | av_fill(av, -1); |
| 486 | |
| 487 | if (AvREAL(av)) { |
| 488 | register I32 key = AvFILLp(av) + 1; |
| 489 | while (key) |
| 490 | SvREFCNT_dec(AvARRAY(av)[--key]); |
| 491 | } |
| 492 | |
| 493 | Safefree(AvALLOC(av)); |
| 494 | AvALLOC(av) = NULL; |
| 495 | AvARRAY(av) = NULL; |
| 496 | AvMAX(av) = AvFILLp(av) = -1; |
| 497 | |
| 498 | if(SvRMAGICAL(av)) mg_clear((SV*)av); |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | |
| 503 | =for apidoc av_create_and_push |
| 504 | |
| 505 | Push an SV onto the end of the array, creating the array if necessary. |
| 506 | A small internal helper function to remove a commonly duplicated idiom. |
| 507 | |
| 508 | =cut |
| 509 | */ |
| 510 | |
| 511 | void |
| 512 | Perl_av_create_and_push(pTHX_ AV **const avp, SV *const val) |
| 513 | { |
| 514 | PERL_ARGS_ASSERT_AV_CREATE_AND_PUSH; |
| 515 | |
| 516 | if (!*avp) |
| 517 | *avp = newAV(); |
| 518 | av_push(*avp, val); |
| 519 | } |
| 520 | |
| 521 | /* |
| 522 | =for apidoc av_push |
| 523 | |
| 524 | Pushes an SV onto the end of the array. The array will grow automatically |
| 525 | to accommodate the addition. |
| 526 | |
| 527 | =cut |
| 528 | */ |
| 529 | |
| 530 | void |
| 531 | Perl_av_push(pTHX_ register AV *av, SV *val) |
| 532 | { |
| 533 | dVAR; |
| 534 | MAGIC *mg; |
| 535 | |
| 536 | PERL_ARGS_ASSERT_AV_PUSH; |
| 537 | assert(SvTYPE(av) == SVt_PVAV); |
| 538 | |
| 539 | if (SvREADONLY(av)) |
| 540 | Perl_croak(aTHX_ PL_no_modify); |
| 541 | |
| 542 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 543 | dSP; |
| 544 | PUSHSTACKi(PERLSI_MAGIC); |
| 545 | PUSHMARK(SP); |
| 546 | EXTEND(SP,2); |
| 547 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 548 | PUSHs(val); |
| 549 | PUTBACK; |
| 550 | ENTER; |
| 551 | call_method("PUSH", G_SCALAR|G_DISCARD); |
| 552 | LEAVE; |
| 553 | POPSTACK; |
| 554 | return; |
| 555 | } |
| 556 | av_store(av,AvFILLp(av)+1,val); |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | =for apidoc av_pop |
| 561 | |
| 562 | Pops an SV off the end of the array. Returns C<&PL_sv_undef> if the array |
| 563 | is empty. |
| 564 | |
| 565 | =cut |
| 566 | */ |
| 567 | |
| 568 | SV * |
| 569 | Perl_av_pop(pTHX_ register AV *av) |
| 570 | { |
| 571 | dVAR; |
| 572 | SV *retval; |
| 573 | MAGIC* mg; |
| 574 | |
| 575 | PERL_ARGS_ASSERT_AV_POP; |
| 576 | assert(SvTYPE(av) == SVt_PVAV); |
| 577 | |
| 578 | if (SvREADONLY(av)) |
| 579 | Perl_croak(aTHX_ PL_no_modify); |
| 580 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 581 | dSP; |
| 582 | PUSHSTACKi(PERLSI_MAGIC); |
| 583 | PUSHMARK(SP); |
| 584 | XPUSHs(SvTIED_obj((SV*)av, mg)); |
| 585 | PUTBACK; |
| 586 | ENTER; |
| 587 | if (call_method("POP", G_SCALAR)) { |
| 588 | retval = newSVsv(*PL_stack_sp--); |
| 589 | } else { |
| 590 | retval = &PL_sv_undef; |
| 591 | } |
| 592 | LEAVE; |
| 593 | POPSTACK; |
| 594 | return retval; |
| 595 | } |
| 596 | if (AvFILL(av) < 0) |
| 597 | return &PL_sv_undef; |
| 598 | retval = AvARRAY(av)[AvFILLp(av)]; |
| 599 | AvARRAY(av)[AvFILLp(av)--] = &PL_sv_undef; |
| 600 | if (SvSMAGICAL(av)) |
| 601 | mg_set((SV*)av); |
| 602 | return retval; |
| 603 | } |
| 604 | |
| 605 | /* |
| 606 | |
| 607 | =for apidoc av_create_and_unshift_one |
| 608 | |
| 609 | Unshifts an SV onto the beginning of the array, creating the array if |
| 610 | necessary. |
| 611 | A small internal helper function to remove a commonly duplicated idiom. |
| 612 | |
| 613 | =cut |
| 614 | */ |
| 615 | |
| 616 | SV ** |
| 617 | Perl_av_create_and_unshift_one(pTHX_ AV **const avp, SV *const val) |
| 618 | { |
| 619 | PERL_ARGS_ASSERT_AV_CREATE_AND_UNSHIFT_ONE; |
| 620 | |
| 621 | if (!*avp) |
| 622 | *avp = newAV(); |
| 623 | av_unshift(*avp, 1); |
| 624 | return av_store(*avp, 0, val); |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | =for apidoc av_unshift |
| 629 | |
| 630 | Unshift the given number of C<undef> values onto the beginning of the |
| 631 | array. The array will grow automatically to accommodate the addition. You |
| 632 | must then use C<av_store> to assign values to these new elements. |
| 633 | |
| 634 | =cut |
| 635 | */ |
| 636 | |
| 637 | void |
| 638 | Perl_av_unshift(pTHX_ register AV *av, register I32 num) |
| 639 | { |
| 640 | dVAR; |
| 641 | register I32 i; |
| 642 | MAGIC* mg; |
| 643 | |
| 644 | PERL_ARGS_ASSERT_AV_UNSHIFT; |
| 645 | assert(SvTYPE(av) == SVt_PVAV); |
| 646 | |
| 647 | if (SvREADONLY(av)) |
| 648 | Perl_croak(aTHX_ PL_no_modify); |
| 649 | |
| 650 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 651 | dSP; |
| 652 | PUSHSTACKi(PERLSI_MAGIC); |
| 653 | PUSHMARK(SP); |
| 654 | EXTEND(SP,1+num); |
| 655 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 656 | while (num-- > 0) { |
| 657 | PUSHs(&PL_sv_undef); |
| 658 | } |
| 659 | PUTBACK; |
| 660 | ENTER; |
| 661 | call_method("UNSHIFT", G_SCALAR|G_DISCARD); |
| 662 | LEAVE; |
| 663 | POPSTACK; |
| 664 | return; |
| 665 | } |
| 666 | |
| 667 | if (num <= 0) |
| 668 | return; |
| 669 | if (!AvREAL(av) && AvREIFY(av)) |
| 670 | av_reify(av); |
| 671 | i = AvARRAY(av) - AvALLOC(av); |
| 672 | if (i) { |
| 673 | if (i > num) |
| 674 | i = num; |
| 675 | num -= i; |
| 676 | |
| 677 | AvMAX(av) += i; |
| 678 | AvFILLp(av) += i; |
| 679 | AvARRAY(av) = AvARRAY(av) - i; |
| 680 | } |
| 681 | if (num) { |
| 682 | register SV **ary; |
| 683 | const I32 i = AvFILLp(av); |
| 684 | /* Create extra elements */ |
| 685 | const I32 slide = i > 0 ? i : 0; |
| 686 | num += slide; |
| 687 | av_extend(av, i + num); |
| 688 | AvFILLp(av) += num; |
| 689 | ary = AvARRAY(av); |
| 690 | Move(ary, ary + num, i + 1, SV*); |
| 691 | do { |
| 692 | ary[--num] = &PL_sv_undef; |
| 693 | } while (num); |
| 694 | /* Make extra elements into a buffer */ |
| 695 | AvMAX(av) -= slide; |
| 696 | AvFILLp(av) -= slide; |
| 697 | AvARRAY(av) = AvARRAY(av) + slide; |
| 698 | } |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | =for apidoc av_shift |
| 703 | |
| 704 | Shifts an SV off the beginning of the array. |
| 705 | |
| 706 | =cut |
| 707 | */ |
| 708 | |
| 709 | SV * |
| 710 | Perl_av_shift(pTHX_ register AV *av) |
| 711 | { |
| 712 | dVAR; |
| 713 | SV *retval; |
| 714 | MAGIC* mg; |
| 715 | |
| 716 | PERL_ARGS_ASSERT_AV_SHIFT; |
| 717 | assert(SvTYPE(av) == SVt_PVAV); |
| 718 | |
| 719 | if (SvREADONLY(av)) |
| 720 | Perl_croak(aTHX_ PL_no_modify); |
| 721 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 722 | dSP; |
| 723 | PUSHSTACKi(PERLSI_MAGIC); |
| 724 | PUSHMARK(SP); |
| 725 | XPUSHs(SvTIED_obj((SV*)av, mg)); |
| 726 | PUTBACK; |
| 727 | ENTER; |
| 728 | if (call_method("SHIFT", G_SCALAR)) { |
| 729 | retval = newSVsv(*PL_stack_sp--); |
| 730 | } else { |
| 731 | retval = &PL_sv_undef; |
| 732 | } |
| 733 | LEAVE; |
| 734 | POPSTACK; |
| 735 | return retval; |
| 736 | } |
| 737 | if (AvFILL(av) < 0) |
| 738 | return &PL_sv_undef; |
| 739 | retval = *AvARRAY(av); |
| 740 | if (AvREAL(av)) |
| 741 | *AvARRAY(av) = &PL_sv_undef; |
| 742 | AvARRAY(av) = AvARRAY(av) + 1; |
| 743 | AvMAX(av)--; |
| 744 | AvFILLp(av)--; |
| 745 | if (SvSMAGICAL(av)) |
| 746 | mg_set((SV*)av); |
| 747 | return retval; |
| 748 | } |
| 749 | |
| 750 | /* |
| 751 | =for apidoc av_len |
| 752 | |
| 753 | Returns the highest index in the array. The number of elements in the |
| 754 | array is C<av_len(av) + 1>. Returns -1 if the array is empty. |
| 755 | |
| 756 | =cut |
| 757 | */ |
| 758 | |
| 759 | I32 |
| 760 | Perl_av_len(pTHX_ register const AV *av) |
| 761 | { |
| 762 | PERL_ARGS_ASSERT_AV_LEN; |
| 763 | assert(SvTYPE(av) == SVt_PVAV); |
| 764 | |
| 765 | return AvFILL(av); |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | =for apidoc av_fill |
| 770 | |
| 771 | Set the highest index in the array to the given number, equivalent to |
| 772 | Perl's C<$#array = $fill;>. |
| 773 | |
| 774 | The number of elements in the an array will be C<fill + 1> after |
| 775 | av_fill() returns. If the array was previously shorter then the |
| 776 | additional elements appended are set to C<PL_sv_undef>. If the array |
| 777 | was longer, then the excess elements are freed. C<av_fill(av, -1)> is |
| 778 | the same as C<av_clear(av)>. |
| 779 | |
| 780 | =cut |
| 781 | */ |
| 782 | void |
| 783 | Perl_av_fill(pTHX_ register AV *av, I32 fill) |
| 784 | { |
| 785 | dVAR; |
| 786 | MAGIC *mg; |
| 787 | |
| 788 | PERL_ARGS_ASSERT_AV_FILL; |
| 789 | assert(SvTYPE(av) == SVt_PVAV); |
| 790 | |
| 791 | if (fill < 0) |
| 792 | fill = -1; |
| 793 | if ((mg = SvTIED_mg((SV*)av, PERL_MAGIC_tied))) { |
| 794 | dSP; |
| 795 | ENTER; |
| 796 | SAVETMPS; |
| 797 | PUSHSTACKi(PERLSI_MAGIC); |
| 798 | PUSHMARK(SP); |
| 799 | EXTEND(SP,2); |
| 800 | PUSHs(SvTIED_obj((SV*)av, mg)); |
| 801 | mPUSHi(fill + 1); |
| 802 | PUTBACK; |
| 803 | call_method("STORESIZE", G_SCALAR|G_DISCARD); |
| 804 | POPSTACK; |
| 805 | FREETMPS; |
| 806 | LEAVE; |
| 807 | return; |
| 808 | } |
| 809 | if (fill <= AvMAX(av)) { |
| 810 | I32 key = AvFILLp(av); |
| 811 | SV** const ary = AvARRAY(av); |
| 812 | |
| 813 | if (AvREAL(av)) { |
| 814 | while (key > fill) { |
| 815 | SvREFCNT_dec(ary[key]); |
| 816 | ary[key--] = &PL_sv_undef; |
| 817 | } |
| 818 | } |
| 819 | else { |
| 820 | while (key < fill) |
| 821 | ary[++key] = &PL_sv_undef; |
| 822 | } |
| 823 | |
| 824 | AvFILLp(av) = fill; |
| 825 | if (SvSMAGICAL(av)) |
| 826 | mg_set((SV*)av); |
| 827 | } |
| 828 | else |
| 829 | (void)av_store(av,fill,&PL_sv_undef); |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | =for apidoc av_delete |
| 834 | |
| 835 | Deletes the element indexed by C<key> from the array. Returns the |
| 836 | deleted element. If C<flags> equals C<G_DISCARD>, the element is freed |
| 837 | and null is returned. |
| 838 | |
| 839 | =cut |
| 840 | */ |
| 841 | SV * |
| 842 | Perl_av_delete(pTHX_ AV *av, I32 key, I32 flags) |
| 843 | { |
| 844 | dVAR; |
| 845 | SV *sv; |
| 846 | |
| 847 | PERL_ARGS_ASSERT_AV_DELETE; |
| 848 | assert(SvTYPE(av) == SVt_PVAV); |
| 849 | |
| 850 | if (SvREADONLY(av)) |
| 851 | Perl_croak(aTHX_ PL_no_modify); |
| 852 | |
| 853 | if (SvRMAGICAL(av)) { |
| 854 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 855 | if ((tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata))) { |
| 856 | /* Handle negative array indices 20020222 MJD */ |
| 857 | SV **svp; |
| 858 | if (key < 0) { |
| 859 | unsigned adjust_index = 1; |
| 860 | if (tied_magic) { |
| 861 | SV * const * const negative_indices_glob = |
| 862 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, |
| 863 | tied_magic))), |
| 864 | NEGATIVE_INDICES_VAR, 16, 0); |
| 865 | if (negative_indices_glob |
| 866 | && SvTRUE(GvSV(*negative_indices_glob))) |
| 867 | adjust_index = 0; |
| 868 | } |
| 869 | if (adjust_index) { |
| 870 | key += AvFILL(av) + 1; |
| 871 | if (key < 0) |
| 872 | return NULL; |
| 873 | } |
| 874 | } |
| 875 | svp = av_fetch(av, key, TRUE); |
| 876 | if (svp) { |
| 877 | sv = *svp; |
| 878 | mg_clear(sv); |
| 879 | if (mg_find(sv, PERL_MAGIC_tiedelem)) { |
| 880 | sv_unmagic(sv, PERL_MAGIC_tiedelem); /* No longer an element */ |
| 881 | return sv; |
| 882 | } |
| 883 | return NULL; |
| 884 | } |
| 885 | } |
| 886 | } |
| 887 | |
| 888 | if (key < 0) { |
| 889 | key += AvFILL(av) + 1; |
| 890 | if (key < 0) |
| 891 | return NULL; |
| 892 | } |
| 893 | |
| 894 | if (key > AvFILLp(av)) |
| 895 | return NULL; |
| 896 | else { |
| 897 | if (!AvREAL(av) && AvREIFY(av)) |
| 898 | av_reify(av); |
| 899 | sv = AvARRAY(av)[key]; |
| 900 | if (key == AvFILLp(av)) { |
| 901 | AvARRAY(av)[key] = &PL_sv_undef; |
| 902 | do { |
| 903 | AvFILLp(av)--; |
| 904 | } while (--key >= 0 && AvARRAY(av)[key] == &PL_sv_undef); |
| 905 | } |
| 906 | else |
| 907 | AvARRAY(av)[key] = &PL_sv_undef; |
| 908 | if (SvSMAGICAL(av)) |
| 909 | mg_set((SV*)av); |
| 910 | } |
| 911 | if (flags & G_DISCARD) { |
| 912 | SvREFCNT_dec(sv); |
| 913 | sv = NULL; |
| 914 | } |
| 915 | else if (AvREAL(av)) |
| 916 | sv = sv_2mortal(sv); |
| 917 | return sv; |
| 918 | } |
| 919 | |
| 920 | /* |
| 921 | =for apidoc av_exists |
| 922 | |
| 923 | Returns true if the element indexed by C<key> has been initialized. |
| 924 | |
| 925 | This relies on the fact that uninitialized array elements are set to |
| 926 | C<&PL_sv_undef>. |
| 927 | |
| 928 | =cut |
| 929 | */ |
| 930 | bool |
| 931 | Perl_av_exists(pTHX_ AV *av, I32 key) |
| 932 | { |
| 933 | dVAR; |
| 934 | PERL_ARGS_ASSERT_AV_EXISTS; |
| 935 | assert(SvTYPE(av) == SVt_PVAV); |
| 936 | |
| 937 | if (SvRMAGICAL(av)) { |
| 938 | const MAGIC * const tied_magic = mg_find((SV*)av, PERL_MAGIC_tied); |
| 939 | if (tied_magic || mg_find((SV*)av, PERL_MAGIC_regdata)) { |
| 940 | SV * const sv = sv_newmortal(); |
| 941 | MAGIC *mg; |
| 942 | /* Handle negative array indices 20020222 MJD */ |
| 943 | if (key < 0) { |
| 944 | unsigned adjust_index = 1; |
| 945 | if (tied_magic) { |
| 946 | SV * const * const negative_indices_glob = |
| 947 | hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *)av, |
| 948 | tied_magic))), |
| 949 | NEGATIVE_INDICES_VAR, 16, 0); |
| 950 | if (negative_indices_glob |
| 951 | && SvTRUE(GvSV(*negative_indices_glob))) |
| 952 | adjust_index = 0; |
| 953 | } |
| 954 | if (adjust_index) { |
| 955 | key += AvFILL(av) + 1; |
| 956 | if (key < 0) |
| 957 | return FALSE; |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | mg_copy((SV*)av, sv, 0, key); |
| 962 | mg = mg_find(sv, PERL_MAGIC_tiedelem); |
| 963 | if (mg) { |
| 964 | magic_existspack(sv, mg); |
| 965 | return (bool)SvTRUE(sv); |
| 966 | } |
| 967 | |
| 968 | } |
| 969 | } |
| 970 | |
| 971 | if (key < 0) { |
| 972 | key += AvFILL(av) + 1; |
| 973 | if (key < 0) |
| 974 | return FALSE; |
| 975 | } |
| 976 | |
| 977 | if (key <= AvFILLp(av) && AvARRAY(av)[key] != &PL_sv_undef |
| 978 | && AvARRAY(av)[key]) |
| 979 | { |
| 980 | return TRUE; |
| 981 | } |
| 982 | else |
| 983 | return FALSE; |
| 984 | } |
| 985 | |
| 986 | MAGIC * |
| 987 | S_get_aux_mg(pTHX_ AV *av) { |
| 988 | dVAR; |
| 989 | MAGIC *mg; |
| 990 | |
| 991 | PERL_ARGS_ASSERT_GET_AUX_MG; |
| 992 | assert(SvTYPE(av) == SVt_PVAV); |
| 993 | |
| 994 | mg = mg_find((SV*)av, PERL_MAGIC_arylen_p); |
| 995 | |
| 996 | if (!mg) { |
| 997 | mg = sv_magicext((SV*)av, 0, PERL_MAGIC_arylen_p, &PL_vtbl_arylen_p, |
| 998 | 0, 0); |
| 999 | assert(mg); |
| 1000 | /* sv_magicext won't set this for us because we pass in a NULL obj */ |
| 1001 | mg->mg_flags |= MGf_REFCOUNTED; |
| 1002 | } |
| 1003 | return mg; |
| 1004 | } |
| 1005 | |
| 1006 | SV ** |
| 1007 | Perl_av_arylen_p(pTHX_ AV *av) { |
| 1008 | MAGIC *const mg = get_aux_mg(av); |
| 1009 | |
| 1010 | PERL_ARGS_ASSERT_AV_ARYLEN_P; |
| 1011 | assert(SvTYPE(av) == SVt_PVAV); |
| 1012 | |
| 1013 | return &(mg->mg_obj); |
| 1014 | } |
| 1015 | |
| 1016 | IV * |
| 1017 | Perl_av_iter_p(pTHX_ AV *av) { |
| 1018 | MAGIC *const mg = get_aux_mg(av); |
| 1019 | |
| 1020 | PERL_ARGS_ASSERT_AV_ITER_P; |
| 1021 | assert(SvTYPE(av) == SVt_PVAV); |
| 1022 | |
| 1023 | #if IVSIZE == I32SIZE |
| 1024 | return (IV *)&(mg->mg_len); |
| 1025 | #else |
| 1026 | if (!mg->mg_ptr) { |
| 1027 | IV *temp; |
| 1028 | mg->mg_len = IVSIZE; |
| 1029 | Newxz(temp, 1, IV); |
| 1030 | mg->mg_ptr = (char *) temp; |
| 1031 | } |
| 1032 | return (IV *)mg->mg_ptr; |
| 1033 | #endif |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * Local variables: |
| 1038 | * c-indentation-style: bsd |
| 1039 | * c-basic-offset: 4 |
| 1040 | * indent-tabs-mode: t |
| 1041 | * End: |
| 1042 | * |
| 1043 | * ex: set ts=8 sts=4 sw=4 noet: |
| 1044 | */ |