| 1 | /* scope.c |
| 2 | * |
| 3 | * Copyright (c) 1991-1999, Larry Wall |
| 4 | * |
| 5 | * You may distribute under the terms of either the GNU General Public |
| 6 | * License or the Artistic License, as specified in the README file. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * "For the fashion of Minas Tirith was such that it was built on seven |
| 12 | * levels..." |
| 13 | */ |
| 14 | |
| 15 | #include "EXTERN.h" |
| 16 | #define PERL_IN_SCOPE_C |
| 17 | #include "perl.h" |
| 18 | |
| 19 | void * |
| 20 | Perl_default_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt, |
| 21 | protect_body_t body, ...) |
| 22 | { |
| 23 | void *ret; |
| 24 | va_list args; |
| 25 | va_start(args, body); |
| 26 | ret = vdefault_protect(pcur_env, excpt, body, &args); |
| 27 | va_end(args); |
| 28 | return ret; |
| 29 | } |
| 30 | |
| 31 | void * |
| 32 | Perl_vdefault_protect(pTHX_ volatile JMPENV *pcur_env, int *excpt, |
| 33 | protect_body_t body, va_list *args) |
| 34 | { |
| 35 | dTHR; |
| 36 | int ex; |
| 37 | void *ret; |
| 38 | |
| 39 | DEBUG_l(Perl_deb(aTHX_ "Setting up local jumplevel %p, was %p\n", |
| 40 | pcur_env, PL_top_env)); |
| 41 | JMPENV_PUSH(ex); |
| 42 | if (ex) |
| 43 | ret = NULL; |
| 44 | else |
| 45 | ret = CALL_FPTR(body)(aTHX_ *args); |
| 46 | *excpt = ex; |
| 47 | JMPENV_POP; |
| 48 | return ret; |
| 49 | } |
| 50 | |
| 51 | SV** |
| 52 | Perl_stack_grow(pTHX_ SV **sp, SV **p, int n) |
| 53 | { |
| 54 | dTHR; |
| 55 | #if defined(DEBUGGING) && !defined(USE_THREADS) |
| 56 | static int growing = 0; |
| 57 | if (growing++) |
| 58 | abort(); |
| 59 | #endif |
| 60 | PL_stack_sp = sp; |
| 61 | #ifndef STRESS_REALLOC |
| 62 | av_extend(PL_curstack, (p - PL_stack_base) + (n) + 128); |
| 63 | #else |
| 64 | av_extend(PL_curstack, (p - PL_stack_base) + (n) + 1); |
| 65 | #endif |
| 66 | #if defined(DEBUGGING) && !defined(USE_THREADS) |
| 67 | growing--; |
| 68 | #endif |
| 69 | return PL_stack_sp; |
| 70 | } |
| 71 | |
| 72 | #ifndef STRESS_REALLOC |
| 73 | #define GROW(old) ((old) * 3 / 2) |
| 74 | #else |
| 75 | #define GROW(old) ((old) + 1) |
| 76 | #endif |
| 77 | |
| 78 | PERL_SI * |
| 79 | Perl_new_stackinfo(pTHX_ I32 stitems, I32 cxitems) |
| 80 | { |
| 81 | PERL_SI *si; |
| 82 | PERL_CONTEXT *cxt; |
| 83 | New(56, si, 1, PERL_SI); |
| 84 | si->si_stack = newAV(); |
| 85 | AvREAL_off(si->si_stack); |
| 86 | av_extend(si->si_stack, stitems > 0 ? stitems-1 : 0); |
| 87 | AvALLOC(si->si_stack)[0] = &PL_sv_undef; |
| 88 | AvFILLp(si->si_stack) = 0; |
| 89 | si->si_prev = 0; |
| 90 | si->si_next = 0; |
| 91 | si->si_cxmax = cxitems - 1; |
| 92 | si->si_cxix = -1; |
| 93 | si->si_type = PERLSI_UNDEF; |
| 94 | New(56, si->si_cxstack, cxitems, PERL_CONTEXT); |
| 95 | return si; |
| 96 | } |
| 97 | |
| 98 | I32 |
| 99 | Perl_cxinc(pTHX) |
| 100 | { |
| 101 | dTHR; |
| 102 | cxstack_max = GROW(cxstack_max); |
| 103 | Renew(cxstack, cxstack_max + 1, PERL_CONTEXT); /* XXX should fix CXINC macro */ |
| 104 | return cxstack_ix + 1; |
| 105 | } |
| 106 | |
| 107 | void |
| 108 | Perl_push_return(pTHX_ OP *retop) |
| 109 | { |
| 110 | dTHR; |
| 111 | if (PL_retstack_ix == PL_retstack_max) { |
| 112 | PL_retstack_max = GROW(PL_retstack_max); |
| 113 | Renew(PL_retstack, PL_retstack_max, OP*); |
| 114 | } |
| 115 | PL_retstack[PL_retstack_ix++] = retop; |
| 116 | } |
| 117 | |
| 118 | OP * |
| 119 | Perl_pop_return(pTHX) |
| 120 | { |
| 121 | dTHR; |
| 122 | if (PL_retstack_ix > 0) |
| 123 | return PL_retstack[--PL_retstack_ix]; |
| 124 | else |
| 125 | return Nullop; |
| 126 | } |
| 127 | |
| 128 | void |
| 129 | Perl_push_scope(pTHX) |
| 130 | { |
| 131 | dTHR; |
| 132 | if (PL_scopestack_ix == PL_scopestack_max) { |
| 133 | PL_scopestack_max = GROW(PL_scopestack_max); |
| 134 | Renew(PL_scopestack, PL_scopestack_max, I32); |
| 135 | } |
| 136 | PL_scopestack[PL_scopestack_ix++] = PL_savestack_ix; |
| 137 | |
| 138 | } |
| 139 | |
| 140 | void |
| 141 | Perl_pop_scope(pTHX) |
| 142 | { |
| 143 | dTHR; |
| 144 | I32 oldsave = PL_scopestack[--PL_scopestack_ix]; |
| 145 | LEAVE_SCOPE(oldsave); |
| 146 | } |
| 147 | |
| 148 | void |
| 149 | Perl_markstack_grow(pTHX) |
| 150 | { |
| 151 | dTHR; |
| 152 | I32 oldmax = PL_markstack_max - PL_markstack; |
| 153 | I32 newmax = GROW(oldmax); |
| 154 | |
| 155 | Renew(PL_markstack, newmax, I32); |
| 156 | PL_markstack_ptr = PL_markstack + oldmax; |
| 157 | PL_markstack_max = PL_markstack + newmax; |
| 158 | } |
| 159 | |
| 160 | void |
| 161 | Perl_savestack_grow(pTHX) |
| 162 | { |
| 163 | dTHR; |
| 164 | PL_savestack_max = GROW(PL_savestack_max) + 4; |
| 165 | Renew(PL_savestack, PL_savestack_max, ANY); |
| 166 | } |
| 167 | |
| 168 | #undef GROW |
| 169 | |
| 170 | void |
| 171 | Perl_tmps_grow(pTHX_ I32 n) |
| 172 | { |
| 173 | dTHR; |
| 174 | #ifndef STRESS_REALLOC |
| 175 | if (n < 128) |
| 176 | n = (PL_tmps_max < 512) ? 128 : 512; |
| 177 | #endif |
| 178 | PL_tmps_max = PL_tmps_ix + n + 1; |
| 179 | Renew(PL_tmps_stack, PL_tmps_max, SV*); |
| 180 | } |
| 181 | |
| 182 | |
| 183 | void |
| 184 | Perl_free_tmps(pTHX) |
| 185 | { |
| 186 | dTHR; |
| 187 | /* XXX should tmps_floor live in cxstack? */ |
| 188 | I32 myfloor = PL_tmps_floor; |
| 189 | while (PL_tmps_ix > myfloor) { /* clean up after last statement */ |
| 190 | SV* sv = PL_tmps_stack[PL_tmps_ix]; |
| 191 | PL_tmps_stack[PL_tmps_ix--] = Nullsv; |
| 192 | if (sv) { |
| 193 | SvTEMP_off(sv); |
| 194 | SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */ |
| 195 | } |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | STATIC SV * |
| 200 | S_save_scalar_at(pTHX_ SV **sptr) |
| 201 | { |
| 202 | dTHR; |
| 203 | register SV *sv; |
| 204 | SV *osv = *sptr; |
| 205 | |
| 206 | sv = *sptr = NEWSV(0,0); |
| 207 | if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv) && SvTYPE(osv) != SVt_PVGV) { |
| 208 | sv_upgrade(sv, SvTYPE(osv)); |
| 209 | if (SvGMAGICAL(osv)) { |
| 210 | MAGIC* mg; |
| 211 | bool oldtainted = PL_tainted; |
| 212 | mg_get(osv); |
| 213 | if (PL_tainting && PL_tainted && (mg = mg_find(osv, 't'))) { |
| 214 | SAVESPTR(mg->mg_obj); |
| 215 | mg->mg_obj = osv; |
| 216 | } |
| 217 | SvFLAGS(osv) |= (SvFLAGS(osv) & |
| 218 | (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT; |
| 219 | PL_tainted = oldtainted; |
| 220 | } |
| 221 | SvMAGIC(sv) = SvMAGIC(osv); |
| 222 | SvFLAGS(sv) |= SvMAGICAL(osv); |
| 223 | PL_localizing = 1; |
| 224 | SvSETMAGIC(sv); |
| 225 | PL_localizing = 0; |
| 226 | } |
| 227 | return sv; |
| 228 | } |
| 229 | |
| 230 | SV * |
| 231 | Perl_save_scalar(pTHX_ GV *gv) |
| 232 | { |
| 233 | dTHR; |
| 234 | SV **sptr = &GvSV(gv); |
| 235 | SSCHECK(3); |
| 236 | SSPUSHPTR(SvREFCNT_inc(gv)); |
| 237 | SSPUSHPTR(SvREFCNT_inc(*sptr)); |
| 238 | SSPUSHINT(SAVEt_SV); |
| 239 | return save_scalar_at(sptr); |
| 240 | } |
| 241 | |
| 242 | SV* |
| 243 | Perl_save_svref(pTHX_ SV **sptr) |
| 244 | { |
| 245 | dTHR; |
| 246 | SSCHECK(3); |
| 247 | SSPUSHPTR(sptr); |
| 248 | SSPUSHPTR(SvREFCNT_inc(*sptr)); |
| 249 | SSPUSHINT(SAVEt_SVREF); |
| 250 | return save_scalar_at(sptr); |
| 251 | } |
| 252 | |
| 253 | /* Like save_svref(), but doesn't deal with magic. Can be used to |
| 254 | * restore a global SV to its prior contents, freeing new value. */ |
| 255 | void |
| 256 | Perl_save_generic_svref(pTHX_ SV **sptr) |
| 257 | { |
| 258 | dTHR; |
| 259 | SSCHECK(3); |
| 260 | SSPUSHPTR(sptr); |
| 261 | SSPUSHPTR(SvREFCNT_inc(*sptr)); |
| 262 | SSPUSHINT(SAVEt_GENERIC_SVREF); |
| 263 | } |
| 264 | |
| 265 | void |
| 266 | Perl_save_gp(pTHX_ GV *gv, I32 empty) |
| 267 | { |
| 268 | dTHR; |
| 269 | SSCHECK(6); |
| 270 | SSPUSHIV((IV)SvLEN(gv)); |
| 271 | SvLEN(gv) = 0; /* forget that anything was allocated here */ |
| 272 | SSPUSHIV((IV)SvCUR(gv)); |
| 273 | SSPUSHPTR(SvPVX(gv)); |
| 274 | SvPOK_off(gv); |
| 275 | SSPUSHPTR(SvREFCNT_inc(gv)); |
| 276 | SSPUSHPTR(GvGP(gv)); |
| 277 | SSPUSHINT(SAVEt_GP); |
| 278 | |
| 279 | if (empty) { |
| 280 | register GP *gp; |
| 281 | |
| 282 | if (GvCVu(gv)) |
| 283 | PL_sub_generation++; /* taking a method out of circulation */ |
| 284 | Newz(602, gp, 1, GP); |
| 285 | GvGP(gv) = gp_ref(gp); |
| 286 | GvSV(gv) = NEWSV(72,0); |
| 287 | GvLINE(gv) = PL_curcop->cop_line; |
| 288 | GvEGV(gv) = gv; |
| 289 | } |
| 290 | else { |
| 291 | gp_ref(GvGP(gv)); |
| 292 | GvINTRO_on(gv); |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | AV * |
| 297 | Perl_save_ary(pTHX_ GV *gv) |
| 298 | { |
| 299 | dTHR; |
| 300 | AV *oav = GvAVn(gv); |
| 301 | AV *av; |
| 302 | |
| 303 | if (!AvREAL(oav) && AvREIFY(oav)) |
| 304 | av_reify(oav); |
| 305 | SSCHECK(3); |
| 306 | SSPUSHPTR(gv); |
| 307 | SSPUSHPTR(oav); |
| 308 | SSPUSHINT(SAVEt_AV); |
| 309 | |
| 310 | GvAV(gv) = Null(AV*); |
| 311 | av = GvAVn(gv); |
| 312 | if (SvMAGIC(oav)) { |
| 313 | SvMAGIC(av) = SvMAGIC(oav); |
| 314 | SvFLAGS(av) |= SvMAGICAL(oav); |
| 315 | SvMAGICAL_off(oav); |
| 316 | SvMAGIC(oav) = 0; |
| 317 | PL_localizing = 1; |
| 318 | SvSETMAGIC((SV*)av); |
| 319 | PL_localizing = 0; |
| 320 | } |
| 321 | return av; |
| 322 | } |
| 323 | |
| 324 | HV * |
| 325 | Perl_save_hash(pTHX_ GV *gv) |
| 326 | { |
| 327 | dTHR; |
| 328 | HV *ohv, *hv; |
| 329 | |
| 330 | SSCHECK(3); |
| 331 | SSPUSHPTR(gv); |
| 332 | SSPUSHPTR(ohv = GvHVn(gv)); |
| 333 | SSPUSHINT(SAVEt_HV); |
| 334 | |
| 335 | GvHV(gv) = Null(HV*); |
| 336 | hv = GvHVn(gv); |
| 337 | if (SvMAGIC(ohv)) { |
| 338 | SvMAGIC(hv) = SvMAGIC(ohv); |
| 339 | SvFLAGS(hv) |= SvMAGICAL(ohv); |
| 340 | SvMAGICAL_off(ohv); |
| 341 | SvMAGIC(ohv) = 0; |
| 342 | PL_localizing = 1; |
| 343 | SvSETMAGIC((SV*)hv); |
| 344 | PL_localizing = 0; |
| 345 | } |
| 346 | return hv; |
| 347 | } |
| 348 | |
| 349 | void |
| 350 | Perl_save_item(pTHX_ register SV *item) |
| 351 | { |
| 352 | dTHR; |
| 353 | register SV *sv = NEWSV(0,0); |
| 354 | |
| 355 | sv_setsv(sv,item); |
| 356 | SSCHECK(3); |
| 357 | SSPUSHPTR(item); /* remember the pointer */ |
| 358 | SSPUSHPTR(sv); /* remember the value */ |
| 359 | SSPUSHINT(SAVEt_ITEM); |
| 360 | } |
| 361 | |
| 362 | void |
| 363 | Perl_save_int(pTHX_ int *intp) |
| 364 | { |
| 365 | dTHR; |
| 366 | SSCHECK(3); |
| 367 | SSPUSHINT(*intp); |
| 368 | SSPUSHPTR(intp); |
| 369 | SSPUSHINT(SAVEt_INT); |
| 370 | } |
| 371 | |
| 372 | void |
| 373 | Perl_save_long(pTHX_ long int *longp) |
| 374 | { |
| 375 | dTHR; |
| 376 | SSCHECK(3); |
| 377 | SSPUSHLONG(*longp); |
| 378 | SSPUSHPTR(longp); |
| 379 | SSPUSHINT(SAVEt_LONG); |
| 380 | } |
| 381 | |
| 382 | void |
| 383 | Perl_save_I32(pTHX_ I32 *intp) |
| 384 | { |
| 385 | dTHR; |
| 386 | SSCHECK(3); |
| 387 | SSPUSHINT(*intp); |
| 388 | SSPUSHPTR(intp); |
| 389 | SSPUSHINT(SAVEt_I32); |
| 390 | } |
| 391 | |
| 392 | void |
| 393 | Perl_save_I16(pTHX_ I16 *intp) |
| 394 | { |
| 395 | dTHR; |
| 396 | SSCHECK(3); |
| 397 | SSPUSHINT(*intp); |
| 398 | SSPUSHPTR(intp); |
| 399 | SSPUSHINT(SAVEt_I16); |
| 400 | } |
| 401 | |
| 402 | void |
| 403 | Perl_save_iv(pTHX_ IV *ivp) |
| 404 | { |
| 405 | dTHR; |
| 406 | SSCHECK(3); |
| 407 | SSPUSHIV(*ivp); |
| 408 | SSPUSHPTR(ivp); |
| 409 | SSPUSHINT(SAVEt_IV); |
| 410 | } |
| 411 | |
| 412 | /* Cannot use save_sptr() to store a char* since the SV** cast will |
| 413 | * force word-alignment and we'll miss the pointer. |
| 414 | */ |
| 415 | void |
| 416 | Perl_save_pptr(pTHX_ char **pptr) |
| 417 | { |
| 418 | dTHR; |
| 419 | SSCHECK(3); |
| 420 | SSPUSHPTR(*pptr); |
| 421 | SSPUSHPTR(pptr); |
| 422 | SSPUSHINT(SAVEt_PPTR); |
| 423 | } |
| 424 | |
| 425 | void |
| 426 | Perl_save_sptr(pTHX_ SV **sptr) |
| 427 | { |
| 428 | dTHR; |
| 429 | SSCHECK(3); |
| 430 | SSPUSHPTR(*sptr); |
| 431 | SSPUSHPTR(sptr); |
| 432 | SSPUSHINT(SAVEt_SPTR); |
| 433 | } |
| 434 | |
| 435 | SV ** |
| 436 | Perl_save_threadsv(pTHX_ PADOFFSET i) |
| 437 | { |
| 438 | #ifdef USE_THREADS |
| 439 | dTHR; |
| 440 | SV **svp = &THREADSV(i); /* XXX Change to save by offset */ |
| 441 | DEBUG_S(PerlIO_printf(Perl_debug_log, "save_threadsv %u: %p %p:%s\n", |
| 442 | i, svp, *svp, SvPEEK(*svp))); |
| 443 | save_svref(svp); |
| 444 | return svp; |
| 445 | #else |
| 446 | Perl_croak(aTHX_ "panic: save_threadsv called in non-threaded perl"); |
| 447 | return 0; |
| 448 | #endif /* USE_THREADS */ |
| 449 | } |
| 450 | |
| 451 | void |
| 452 | Perl_save_nogv(pTHX_ GV *gv) |
| 453 | { |
| 454 | dTHR; |
| 455 | SSCHECK(2); |
| 456 | SSPUSHPTR(gv); |
| 457 | SSPUSHINT(SAVEt_NSTAB); |
| 458 | } |
| 459 | |
| 460 | void |
| 461 | Perl_save_hptr(pTHX_ HV **hptr) |
| 462 | { |
| 463 | dTHR; |
| 464 | SSCHECK(3); |
| 465 | SSPUSHPTR(*hptr); |
| 466 | SSPUSHPTR(hptr); |
| 467 | SSPUSHINT(SAVEt_HPTR); |
| 468 | } |
| 469 | |
| 470 | void |
| 471 | Perl_save_aptr(pTHX_ AV **aptr) |
| 472 | { |
| 473 | dTHR; |
| 474 | SSCHECK(3); |
| 475 | SSPUSHPTR(*aptr); |
| 476 | SSPUSHPTR(aptr); |
| 477 | SSPUSHINT(SAVEt_APTR); |
| 478 | } |
| 479 | |
| 480 | void |
| 481 | Perl_save_freesv(pTHX_ SV *sv) |
| 482 | { |
| 483 | dTHR; |
| 484 | SSCHECK(2); |
| 485 | SSPUSHPTR(sv); |
| 486 | SSPUSHINT(SAVEt_FREESV); |
| 487 | } |
| 488 | |
| 489 | void |
| 490 | Perl_save_freeop(pTHX_ OP *o) |
| 491 | { |
| 492 | dTHR; |
| 493 | SSCHECK(2); |
| 494 | SSPUSHPTR(o); |
| 495 | SSPUSHINT(SAVEt_FREEOP); |
| 496 | } |
| 497 | |
| 498 | void |
| 499 | Perl_save_freepv(pTHX_ char *pv) |
| 500 | { |
| 501 | dTHR; |
| 502 | SSCHECK(2); |
| 503 | SSPUSHPTR(pv); |
| 504 | SSPUSHINT(SAVEt_FREEPV); |
| 505 | } |
| 506 | |
| 507 | void |
| 508 | Perl_save_clearsv(pTHX_ SV **svp) |
| 509 | { |
| 510 | dTHR; |
| 511 | SSCHECK(2); |
| 512 | SSPUSHLONG((long)(svp-PL_curpad)); |
| 513 | SSPUSHINT(SAVEt_CLEARSV); |
| 514 | } |
| 515 | |
| 516 | void |
| 517 | Perl_save_delete(pTHX_ HV *hv, char *key, I32 klen) |
| 518 | { |
| 519 | dTHR; |
| 520 | SSCHECK(4); |
| 521 | SSPUSHINT(klen); |
| 522 | SSPUSHPTR(key); |
| 523 | SSPUSHPTR(SvREFCNT_inc(hv)); |
| 524 | SSPUSHINT(SAVEt_DELETE); |
| 525 | } |
| 526 | |
| 527 | void |
| 528 | Perl_save_list(pTHX_ register SV **sarg, I32 maxsarg) |
| 529 | { |
| 530 | dTHR; |
| 531 | register SV *sv; |
| 532 | register I32 i; |
| 533 | |
| 534 | for (i = 1; i <= maxsarg; i++) { |
| 535 | sv = NEWSV(0,0); |
| 536 | sv_setsv(sv,sarg[i]); |
| 537 | SSCHECK(3); |
| 538 | SSPUSHPTR(sarg[i]); /* remember the pointer */ |
| 539 | SSPUSHPTR(sv); /* remember the value */ |
| 540 | SSPUSHINT(SAVEt_ITEM); |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | void |
| 545 | Perl_save_destructor(pTHX_ DESTRUCTORFUNC_NOCONTEXT_t f, void* p) |
| 546 | { |
| 547 | dTHR; |
| 548 | SSCHECK(3); |
| 549 | SSPUSHDPTR(f); |
| 550 | SSPUSHPTR(p); |
| 551 | SSPUSHINT(SAVEt_DESTRUCTOR); |
| 552 | } |
| 553 | |
| 554 | void |
| 555 | Perl_save_destructor_x(pTHX_ DESTRUCTORFUNC_t f, void* p) |
| 556 | { |
| 557 | dTHR; |
| 558 | SSCHECK(3); |
| 559 | SSPUSHDXPTR(f); |
| 560 | SSPUSHPTR(p); |
| 561 | SSPUSHINT(SAVEt_DESTRUCTOR_X); |
| 562 | } |
| 563 | |
| 564 | void |
| 565 | Perl_save_aelem(pTHX_ AV *av, I32 idx, SV **sptr) |
| 566 | { |
| 567 | dTHR; |
| 568 | SSCHECK(4); |
| 569 | SSPUSHPTR(SvREFCNT_inc(av)); |
| 570 | SSPUSHINT(idx); |
| 571 | SSPUSHPTR(SvREFCNT_inc(*sptr)); |
| 572 | SSPUSHINT(SAVEt_AELEM); |
| 573 | save_scalar_at(sptr); |
| 574 | } |
| 575 | |
| 576 | void |
| 577 | Perl_save_helem(pTHX_ HV *hv, SV *key, SV **sptr) |
| 578 | { |
| 579 | dTHR; |
| 580 | SSCHECK(4); |
| 581 | SSPUSHPTR(SvREFCNT_inc(hv)); |
| 582 | SSPUSHPTR(SvREFCNT_inc(key)); |
| 583 | SSPUSHPTR(SvREFCNT_inc(*sptr)); |
| 584 | SSPUSHINT(SAVEt_HELEM); |
| 585 | save_scalar_at(sptr); |
| 586 | } |
| 587 | |
| 588 | void |
| 589 | Perl_save_op(pTHX) |
| 590 | { |
| 591 | dTHR; |
| 592 | SSCHECK(2); |
| 593 | SSPUSHPTR(PL_op); |
| 594 | SSPUSHINT(SAVEt_OP); |
| 595 | } |
| 596 | |
| 597 | I32 |
| 598 | Perl_save_alloc(pTHX_ I32 size, I32 pad) |
| 599 | { |
| 600 | dTHR; |
| 601 | register I32 start = pad + ((char*)&PL_savestack[PL_savestack_ix] |
| 602 | - (char*)PL_savestack); |
| 603 | register I32 elems = 1 + ((size + pad - 1) / sizeof(*PL_savestack)); |
| 604 | |
| 605 | /* SSCHECK may not be good enough */ |
| 606 | while (PL_savestack_ix + elems + 2 > PL_savestack_max) |
| 607 | savestack_grow(); |
| 608 | |
| 609 | PL_savestack_ix += elems; |
| 610 | SSPUSHINT(elems); |
| 611 | SSPUSHINT(SAVEt_ALLOC); |
| 612 | return start; |
| 613 | } |
| 614 | |
| 615 | void |
| 616 | Perl_leave_scope(pTHX_ I32 base) |
| 617 | { |
| 618 | dTHR; |
| 619 | register SV *sv; |
| 620 | register SV *value; |
| 621 | register GV *gv; |
| 622 | register AV *av; |
| 623 | register HV *hv; |
| 624 | register void* ptr; |
| 625 | I32 i; |
| 626 | |
| 627 | if (base < -1) |
| 628 | Perl_croak(aTHX_ "panic: corrupt saved stack index"); |
| 629 | while (PL_savestack_ix > base) { |
| 630 | switch (SSPOPINT) { |
| 631 | case SAVEt_ITEM: /* normal string */ |
| 632 | value = (SV*)SSPOPPTR; |
| 633 | sv = (SV*)SSPOPPTR; |
| 634 | sv_replace(sv,value); |
| 635 | PL_localizing = 2; |
| 636 | SvSETMAGIC(sv); |
| 637 | PL_localizing = 0; |
| 638 | break; |
| 639 | case SAVEt_SV: /* scalar reference */ |
| 640 | value = (SV*)SSPOPPTR; |
| 641 | gv = (GV*)SSPOPPTR; |
| 642 | ptr = &GvSV(gv); |
| 643 | SvREFCNT_dec(gv); |
| 644 | goto restore_sv; |
| 645 | case SAVEt_GENERIC_SVREF: /* generic sv */ |
| 646 | value = (SV*)SSPOPPTR; |
| 647 | ptr = SSPOPPTR; |
| 648 | if (ptr) { |
| 649 | sv = *(SV**)ptr; |
| 650 | *(SV**)ptr = value; |
| 651 | SvREFCNT_dec(sv); |
| 652 | } |
| 653 | SvREFCNT_dec(value); |
| 654 | break; |
| 655 | case SAVEt_SVREF: /* scalar reference */ |
| 656 | value = (SV*)SSPOPPTR; |
| 657 | ptr = SSPOPPTR; |
| 658 | restore_sv: |
| 659 | sv = *(SV**)ptr; |
| 660 | DEBUG_S(PerlIO_printf(Perl_debug_log, |
| 661 | "restore svref: %p %p:%s -> %p:%s\n", |
| 662 | ptr, sv, SvPEEK(sv), value, SvPEEK(value))); |
| 663 | if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv) && |
| 664 | SvTYPE(sv) != SVt_PVGV) |
| 665 | { |
| 666 | (void)SvUPGRADE(value, SvTYPE(sv)); |
| 667 | SvMAGIC(value) = SvMAGIC(sv); |
| 668 | SvFLAGS(value) |= SvMAGICAL(sv); |
| 669 | SvMAGICAL_off(sv); |
| 670 | SvMAGIC(sv) = 0; |
| 671 | } |
| 672 | else if (SvTYPE(value) >= SVt_PVMG && SvMAGIC(value) && |
| 673 | SvTYPE(value) != SVt_PVGV) |
| 674 | { |
| 675 | SvFLAGS(value) |= (SvFLAGS(value) & |
| 676 | (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT; |
| 677 | SvMAGICAL_off(value); |
| 678 | SvMAGIC(value) = 0; |
| 679 | } |
| 680 | SvREFCNT_dec(sv); |
| 681 | *(SV**)ptr = value; |
| 682 | PL_localizing = 2; |
| 683 | SvSETMAGIC(value); |
| 684 | PL_localizing = 0; |
| 685 | SvREFCNT_dec(value); |
| 686 | break; |
| 687 | case SAVEt_AV: /* array reference */ |
| 688 | av = (AV*)SSPOPPTR; |
| 689 | gv = (GV*)SSPOPPTR; |
| 690 | if (GvAV(gv)) { |
| 691 | AV *goner = GvAV(gv); |
| 692 | SvMAGIC(av) = SvMAGIC(goner); |
| 693 | SvFLAGS(av) |= SvMAGICAL(goner); |
| 694 | SvMAGICAL_off(goner); |
| 695 | SvMAGIC(goner) = 0; |
| 696 | SvREFCNT_dec(goner); |
| 697 | } |
| 698 | GvAV(gv) = av; |
| 699 | if (SvMAGICAL(av)) { |
| 700 | PL_localizing = 2; |
| 701 | SvSETMAGIC((SV*)av); |
| 702 | PL_localizing = 0; |
| 703 | } |
| 704 | break; |
| 705 | case SAVEt_HV: /* hash reference */ |
| 706 | hv = (HV*)SSPOPPTR; |
| 707 | gv = (GV*)SSPOPPTR; |
| 708 | if (GvHV(gv)) { |
| 709 | HV *goner = GvHV(gv); |
| 710 | SvMAGIC(hv) = SvMAGIC(goner); |
| 711 | SvFLAGS(hv) |= SvMAGICAL(goner); |
| 712 | SvMAGICAL_off(goner); |
| 713 | SvMAGIC(goner) = 0; |
| 714 | SvREFCNT_dec(goner); |
| 715 | } |
| 716 | GvHV(gv) = hv; |
| 717 | if (SvMAGICAL(hv)) { |
| 718 | PL_localizing = 2; |
| 719 | SvSETMAGIC((SV*)hv); |
| 720 | PL_localizing = 0; |
| 721 | } |
| 722 | break; |
| 723 | case SAVEt_INT: /* int reference */ |
| 724 | ptr = SSPOPPTR; |
| 725 | *(int*)ptr = (int)SSPOPINT; |
| 726 | break; |
| 727 | case SAVEt_LONG: /* long reference */ |
| 728 | ptr = SSPOPPTR; |
| 729 | *(long*)ptr = (long)SSPOPLONG; |
| 730 | break; |
| 731 | case SAVEt_I32: /* I32 reference */ |
| 732 | ptr = SSPOPPTR; |
| 733 | *(I32*)ptr = (I32)SSPOPINT; |
| 734 | break; |
| 735 | case SAVEt_I16: /* I16 reference */ |
| 736 | ptr = SSPOPPTR; |
| 737 | *(I16*)ptr = (I16)SSPOPINT; |
| 738 | break; |
| 739 | case SAVEt_IV: /* IV reference */ |
| 740 | ptr = SSPOPPTR; |
| 741 | *(IV*)ptr = (IV)SSPOPIV; |
| 742 | break; |
| 743 | case SAVEt_SPTR: /* SV* reference */ |
| 744 | ptr = SSPOPPTR; |
| 745 | *(SV**)ptr = (SV*)SSPOPPTR; |
| 746 | break; |
| 747 | case SAVEt_PPTR: /* char* reference */ |
| 748 | ptr = SSPOPPTR; |
| 749 | *(char**)ptr = (char*)SSPOPPTR; |
| 750 | break; |
| 751 | case SAVEt_HPTR: /* HV* reference */ |
| 752 | ptr = SSPOPPTR; |
| 753 | *(HV**)ptr = (HV*)SSPOPPTR; |
| 754 | break; |
| 755 | case SAVEt_APTR: /* AV* reference */ |
| 756 | ptr = SSPOPPTR; |
| 757 | *(AV**)ptr = (AV*)SSPOPPTR; |
| 758 | break; |
| 759 | case SAVEt_NSTAB: |
| 760 | gv = (GV*)SSPOPPTR; |
| 761 | (void)sv_clear((SV*)gv); |
| 762 | break; |
| 763 | case SAVEt_GP: /* scalar reference */ |
| 764 | ptr = SSPOPPTR; |
| 765 | gv = (GV*)SSPOPPTR; |
| 766 | if (SvPVX(gv) && SvLEN(gv) > 0) { |
| 767 | Safefree(SvPVX(gv)); |
| 768 | } |
| 769 | SvPVX(gv) = (char *)SSPOPPTR; |
| 770 | SvCUR(gv) = (STRLEN)SSPOPIV; |
| 771 | SvLEN(gv) = (STRLEN)SSPOPIV; |
| 772 | gp_free(gv); |
| 773 | GvGP(gv) = (GP*)ptr; |
| 774 | if (GvCVu(gv)) |
| 775 | PL_sub_generation++; /* putting a method back into circulation */ |
| 776 | SvREFCNT_dec(gv); |
| 777 | break; |
| 778 | case SAVEt_FREESV: |
| 779 | ptr = SSPOPPTR; |
| 780 | SvREFCNT_dec((SV*)ptr); |
| 781 | break; |
| 782 | case SAVEt_FREEOP: |
| 783 | ptr = SSPOPPTR; |
| 784 | if (PL_comppad) |
| 785 | PL_curpad = AvARRAY(PL_comppad); |
| 786 | op_free((OP*)ptr); |
| 787 | break; |
| 788 | case SAVEt_FREEPV: |
| 789 | ptr = SSPOPPTR; |
| 790 | Safefree((char*)ptr); |
| 791 | break; |
| 792 | case SAVEt_CLEARSV: |
| 793 | ptr = (void*)&PL_curpad[SSPOPLONG]; |
| 794 | sv = *(SV**)ptr; |
| 795 | /* Can clear pad variable in place? */ |
| 796 | if (SvREFCNT(sv) <= 1 && !SvOBJECT(sv)) { |
| 797 | if (SvTHINKFIRST(sv)) |
| 798 | sv_force_normal(sv); |
| 799 | if (SvMAGICAL(sv)) |
| 800 | mg_free(sv); |
| 801 | |
| 802 | switch (SvTYPE(sv)) { |
| 803 | case SVt_NULL: |
| 804 | break; |
| 805 | case SVt_PVAV: |
| 806 | av_clear((AV*)sv); |
| 807 | break; |
| 808 | case SVt_PVHV: |
| 809 | hv_clear((HV*)sv); |
| 810 | break; |
| 811 | case SVt_PVCV: |
| 812 | Perl_croak(aTHX_ "panic: leave_scope pad code"); |
| 813 | case SVt_RV: |
| 814 | case SVt_IV: |
| 815 | case SVt_NV: |
| 816 | (void)SvOK_off(sv); |
| 817 | break; |
| 818 | default: |
| 819 | (void)SvOK_off(sv); |
| 820 | (void)SvOOK_off(sv); |
| 821 | break; |
| 822 | } |
| 823 | } |
| 824 | else { /* Someone has a claim on this, so abandon it. */ |
| 825 | U32 padflags = SvFLAGS(sv) & (SVs_PADBUSY|SVs_PADMY|SVs_PADTMP); |
| 826 | switch (SvTYPE(sv)) { /* Console ourselves with a new value */ |
| 827 | case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break; |
| 828 | case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break; |
| 829 | default: *(SV**)ptr = NEWSV(0,0); break; |
| 830 | } |
| 831 | SvREFCNT_dec(sv); /* Cast current value to the winds. */ |
| 832 | SvFLAGS(*(SV**)ptr) |= padflags; /* preserve pad nature */ |
| 833 | } |
| 834 | break; |
| 835 | case SAVEt_DELETE: |
| 836 | ptr = SSPOPPTR; |
| 837 | hv = (HV*)ptr; |
| 838 | ptr = SSPOPPTR; |
| 839 | (void)hv_delete(hv, (char*)ptr, (U32)SSPOPINT, G_DISCARD); |
| 840 | SvREFCNT_dec(hv); |
| 841 | Safefree(ptr); |
| 842 | break; |
| 843 | case SAVEt_DESTRUCTOR: |
| 844 | ptr = SSPOPPTR; |
| 845 | (*SSPOPDPTR)(ptr); |
| 846 | break; |
| 847 | case SAVEt_DESTRUCTOR_X: |
| 848 | ptr = SSPOPPTR; |
| 849 | (*SSPOPDXPTR)(aTHXo_ ptr); |
| 850 | break; |
| 851 | case SAVEt_REGCONTEXT: |
| 852 | case SAVEt_ALLOC: |
| 853 | i = SSPOPINT; |
| 854 | PL_savestack_ix -= i; /* regexp must have croaked */ |
| 855 | break; |
| 856 | case SAVEt_STACK_POS: /* Position on Perl stack */ |
| 857 | i = SSPOPINT; |
| 858 | PL_stack_sp = PL_stack_base + i; |
| 859 | break; |
| 860 | case SAVEt_AELEM: /* array element */ |
| 861 | value = (SV*)SSPOPPTR; |
| 862 | i = SSPOPINT; |
| 863 | av = (AV*)SSPOPPTR; |
| 864 | ptr = av_fetch(av,i,1); |
| 865 | if (ptr) { |
| 866 | sv = *(SV**)ptr; |
| 867 | if (sv && sv != &PL_sv_undef) { |
| 868 | if (SvTIED_mg((SV*)av, 'P')) |
| 869 | (void)SvREFCNT_inc(sv); |
| 870 | SvREFCNT_dec(av); |
| 871 | goto restore_sv; |
| 872 | } |
| 873 | } |
| 874 | SvREFCNT_dec(av); |
| 875 | SvREFCNT_dec(value); |
| 876 | break; |
| 877 | case SAVEt_HELEM: /* hash element */ |
| 878 | value = (SV*)SSPOPPTR; |
| 879 | sv = (SV*)SSPOPPTR; |
| 880 | hv = (HV*)SSPOPPTR; |
| 881 | ptr = hv_fetch_ent(hv, sv, 1, 0); |
| 882 | if (ptr) { |
| 883 | SV *oval = HeVAL((HE*)ptr); |
| 884 | if (oval && oval != &PL_sv_undef) { |
| 885 | ptr = &HeVAL((HE*)ptr); |
| 886 | if (SvTIED_mg((SV*)hv, 'P')) |
| 887 | (void)SvREFCNT_inc(*(SV**)ptr); |
| 888 | SvREFCNT_dec(hv); |
| 889 | SvREFCNT_dec(sv); |
| 890 | goto restore_sv; |
| 891 | } |
| 892 | } |
| 893 | SvREFCNT_dec(hv); |
| 894 | SvREFCNT_dec(sv); |
| 895 | SvREFCNT_dec(value); |
| 896 | break; |
| 897 | case SAVEt_OP: |
| 898 | PL_op = (OP*)SSPOPPTR; |
| 899 | break; |
| 900 | case SAVEt_HINTS: |
| 901 | if (GvHV(PL_hintgv)) { |
| 902 | SvREFCNT_dec((SV*)GvHV(PL_hintgv)); |
| 903 | GvHV(PL_hintgv) = NULL; |
| 904 | } |
| 905 | *(I32*)&PL_hints = (I32)SSPOPINT; |
| 906 | break; |
| 907 | default: |
| 908 | Perl_croak(aTHX_ "panic: leave_scope inconsistency"); |
| 909 | } |
| 910 | } |
| 911 | } |
| 912 | |
| 913 | void |
| 914 | Perl_cx_dump(pTHX_ PERL_CONTEXT *cx) |
| 915 | { |
| 916 | #ifdef DEBUGGING |
| 917 | dTHR; |
| 918 | PerlIO_printf(Perl_debug_log, "CX %ld = %s\n", (long)(cx - cxstack), PL_block_type[CxTYPE(cx)]); |
| 919 | if (CxTYPE(cx) != CXt_SUBST) { |
| 920 | PerlIO_printf(Perl_debug_log, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp); |
| 921 | PerlIO_printf(Perl_debug_log, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop); |
| 922 | PerlIO_printf(Perl_debug_log, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp); |
| 923 | PerlIO_printf(Perl_debug_log, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp); |
| 924 | PerlIO_printf(Perl_debug_log, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp); |
| 925 | PerlIO_printf(Perl_debug_log, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm); |
| 926 | PerlIO_printf(Perl_debug_log, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR"); |
| 927 | } |
| 928 | switch (CxTYPE(cx)) { |
| 929 | case CXt_NULL: |
| 930 | case CXt_BLOCK: |
| 931 | break; |
| 932 | case CXt_SUB: |
| 933 | PerlIO_printf(Perl_debug_log, "BLK_SUB.CV = 0x%lx\n", |
| 934 | (long)cx->blk_sub.cv); |
| 935 | PerlIO_printf(Perl_debug_log, "BLK_SUB.GV = 0x%lx\n", |
| 936 | (long)cx->blk_sub.gv); |
| 937 | PerlIO_printf(Perl_debug_log, "BLK_SUB.DFOUTGV = 0x%lx\n", |
| 938 | (long)cx->blk_sub.dfoutgv); |
| 939 | PerlIO_printf(Perl_debug_log, "BLK_SUB.OLDDEPTH = %ld\n", |
| 940 | (long)cx->blk_sub.olddepth); |
| 941 | PerlIO_printf(Perl_debug_log, "BLK_SUB.HASARGS = %d\n", |
| 942 | (int)cx->blk_sub.hasargs); |
| 943 | break; |
| 944 | case CXt_EVAL: |
| 945 | PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_IN_EVAL = %ld\n", |
| 946 | (long)cx->blk_eval.old_in_eval); |
| 947 | PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_OP_TYPE = %s (%s)\n", |
| 948 | PL_op_name[cx->blk_eval.old_op_type], |
| 949 | PL_op_desc[cx->blk_eval.old_op_type]); |
| 950 | PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_NAME = %s\n", |
| 951 | cx->blk_eval.old_name); |
| 952 | PerlIO_printf(Perl_debug_log, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n", |
| 953 | (long)cx->blk_eval.old_eval_root); |
| 954 | break; |
| 955 | |
| 956 | case CXt_LOOP: |
| 957 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.LABEL = %s\n", |
| 958 | cx->blk_loop.label); |
| 959 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.RESETSP = %ld\n", |
| 960 | (long)cx->blk_loop.resetsp); |
| 961 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.REDO_OP = 0x%lx\n", |
| 962 | (long)cx->blk_loop.redo_op); |
| 963 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.NEXT_OP = 0x%lx\n", |
| 964 | (long)cx->blk_loop.next_op); |
| 965 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.LAST_OP = 0x%lx\n", |
| 966 | (long)cx->blk_loop.last_op); |
| 967 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERIX = %ld\n", |
| 968 | (long)cx->blk_loop.iterix); |
| 969 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERARY = 0x%lx\n", |
| 970 | (long)cx->blk_loop.iterary); |
| 971 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERVAR = 0x%lx\n", |
| 972 | (long)cx->blk_loop.itervar); |
| 973 | if (cx->blk_loop.itervar) |
| 974 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERSAVE = 0x%lx\n", |
| 975 | (long)cx->blk_loop.itersave); |
| 976 | PerlIO_printf(Perl_debug_log, "BLK_LOOP.ITERLVAL = 0x%lx\n", |
| 977 | (long)cx->blk_loop.iterlval); |
| 978 | break; |
| 979 | |
| 980 | case CXt_SUBST: |
| 981 | PerlIO_printf(Perl_debug_log, "SB_ITERS = %ld\n", |
| 982 | (long)cx->sb_iters); |
| 983 | PerlIO_printf(Perl_debug_log, "SB_MAXITERS = %ld\n", |
| 984 | (long)cx->sb_maxiters); |
| 985 | PerlIO_printf(Perl_debug_log, "SB_RFLAGS = %ld\n", |
| 986 | (long)cx->sb_rflags); |
| 987 | PerlIO_printf(Perl_debug_log, "SB_ONCE = %ld\n", |
| 988 | (long)cx->sb_once); |
| 989 | PerlIO_printf(Perl_debug_log, "SB_ORIG = %s\n", |
| 990 | cx->sb_orig); |
| 991 | PerlIO_printf(Perl_debug_log, "SB_DSTR = 0x%lx\n", |
| 992 | (long)cx->sb_dstr); |
| 993 | PerlIO_printf(Perl_debug_log, "SB_TARG = 0x%lx\n", |
| 994 | (long)cx->sb_targ); |
| 995 | PerlIO_printf(Perl_debug_log, "SB_S = 0x%lx\n", |
| 996 | (long)cx->sb_s); |
| 997 | PerlIO_printf(Perl_debug_log, "SB_M = 0x%lx\n", |
| 998 | (long)cx->sb_m); |
| 999 | PerlIO_printf(Perl_debug_log, "SB_STREND = 0x%lx\n", |
| 1000 | (long)cx->sb_strend); |
| 1001 | PerlIO_printf(Perl_debug_log, "SB_RXRES = 0x%lx\n", |
| 1002 | (long)cx->sb_rxres); |
| 1003 | break; |
| 1004 | } |
| 1005 | #endif /* DEBUGGING */ |
| 1006 | } |