| 1 | /* $RCSfile: op.c,v $$Revision: 4.1 $$Date: 92/08/07 17:19:16 $ |
| 2 | * |
| 3 | * Copyright (c) 1991, 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 | * $Log: op.c,v $ |
| 9 | */ |
| 10 | |
| 11 | #include "EXTERN.h" |
| 12 | #include "perl.h" |
| 13 | |
| 14 | I32 |
| 15 | cxinc() |
| 16 | { |
| 17 | cxstack_max = cxstack_max * 3 / 2; |
| 18 | Renew(cxstack, cxstack_max, CONTEXT); |
| 19 | return cxstack_ix + 1; |
| 20 | } |
| 21 | |
| 22 | void |
| 23 | push_return(retop) |
| 24 | OP *retop; |
| 25 | { |
| 26 | if (retstack_ix == retstack_max) { |
| 27 | retstack_max = retstack_max * 3 / 2; |
| 28 | Renew(retstack, retstack_max, OP*); |
| 29 | } |
| 30 | retstack[retstack_ix++] = retop; |
| 31 | } |
| 32 | |
| 33 | OP * |
| 34 | pop_return() |
| 35 | { |
| 36 | if (retstack_ix > 0) |
| 37 | return retstack[--retstack_ix]; |
| 38 | else |
| 39 | return Nullop; |
| 40 | } |
| 41 | |
| 42 | void |
| 43 | push_scope() |
| 44 | { |
| 45 | if (scopestack_ix == scopestack_max) { |
| 46 | scopestack_max = scopestack_max * 3 / 2; |
| 47 | Renew(scopestack, scopestack_max, I32); |
| 48 | } |
| 49 | scopestack[scopestack_ix++] = savestack_ix; |
| 50 | |
| 51 | } |
| 52 | |
| 53 | void |
| 54 | pop_scope() |
| 55 | { |
| 56 | I32 oldsave = scopestack[--scopestack_ix]; |
| 57 | LEAVE_SCOPE(oldsave); |
| 58 | } |
| 59 | |
| 60 | void |
| 61 | savestack_grow() |
| 62 | { |
| 63 | savestack_max = savestack_max * 3 / 2; |
| 64 | Renew(savestack, savestack_max, ANY); |
| 65 | } |
| 66 | |
| 67 | void |
| 68 | free_tmps() |
| 69 | { |
| 70 | /* XXX should tmps_floor live in cxstack? */ |
| 71 | I32 myfloor = tmps_floor; |
| 72 | while (tmps_ix > myfloor) { /* clean up after last statement */ |
| 73 | SV* sv = tmps_stack[tmps_ix]; |
| 74 | tmps_stack[tmps_ix--] = Nullsv; |
| 75 | if (sv) { |
| 76 | #ifdef DEBUGGING |
| 77 | SvTEMP_off(sv); |
| 78 | #endif |
| 79 | SvREFCNT_dec(sv); /* note, can modify tmps_ix!!! */ |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | SV * |
| 85 | save_scalar(gv) |
| 86 | GV *gv; |
| 87 | { |
| 88 | register SV *sv; |
| 89 | SV *osv = GvSV(gv); |
| 90 | |
| 91 | SSCHECK(3); |
| 92 | SSPUSHPTR(gv); |
| 93 | SSPUSHPTR(osv); |
| 94 | SSPUSHINT(SAVEt_SV); |
| 95 | |
| 96 | sv = GvSV(gv) = NEWSV(0,0); |
| 97 | if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(osv)) { |
| 98 | sv_upgrade(sv, SvTYPE(osv)); |
| 99 | SvMAGIC(sv) = SvMAGIC(osv); |
| 100 | localizing = TRUE; |
| 101 | SvSETMAGIC(sv); |
| 102 | localizing = FALSE; |
| 103 | } |
| 104 | return sv; |
| 105 | } |
| 106 | |
| 107 | #ifdef INLINED_ELSEWHERE |
| 108 | void |
| 109 | save_gp(gv) |
| 110 | GV *gv; |
| 111 | { |
| 112 | register GP *gp; |
| 113 | GP *ogp = GvGP(gv); |
| 114 | |
| 115 | SSCHECK(3); |
| 116 | SSPUSHPTR(gv); |
| 117 | SSPUSHPTR(ogp); |
| 118 | SSPUSHINT(SAVEt_GP); |
| 119 | |
| 120 | Newz(602,gp, 1, GP); |
| 121 | GvGP(gv) = gp; |
| 122 | GvREFCNT(gv) = 1; |
| 123 | GvSV(gv) = NEWSV(72,0); |
| 124 | GvLINE(gv) = curcop->cop_line; |
| 125 | GvEGV(gv) = gv; |
| 126 | } |
| 127 | #endif |
| 128 | |
| 129 | SV* |
| 130 | save_svref(sptr) |
| 131 | SV **sptr; |
| 132 | { |
| 133 | register SV *sv; |
| 134 | SV *osv = *sptr; |
| 135 | |
| 136 | SSCHECK(3); |
| 137 | SSPUSHPTR(*sptr); |
| 138 | SSPUSHPTR(sptr); |
| 139 | SSPUSHINT(SAVEt_SVREF); |
| 140 | |
| 141 | sv = *sptr = NEWSV(0,0); |
| 142 | if (SvTYPE(osv) >= SVt_PVMG && SvMAGIC(sv)) { |
| 143 | sv_upgrade(sv, SvTYPE(osv)); |
| 144 | SvMAGIC(sv) = SvMAGIC(osv); |
| 145 | localizing = TRUE; |
| 146 | SvSETMAGIC(sv); |
| 147 | localizing = FALSE; |
| 148 | } |
| 149 | return sv; |
| 150 | } |
| 151 | |
| 152 | AV * |
| 153 | save_ary(gv) |
| 154 | GV *gv; |
| 155 | { |
| 156 | SSCHECK(3); |
| 157 | SSPUSHPTR(gv); |
| 158 | SSPUSHPTR(GvAVn(gv)); |
| 159 | SSPUSHINT(SAVEt_AV); |
| 160 | |
| 161 | GvAV(gv) = Null(AV*); |
| 162 | return GvAVn(gv); |
| 163 | } |
| 164 | |
| 165 | HV * |
| 166 | save_hash(gv) |
| 167 | GV *gv; |
| 168 | { |
| 169 | SSCHECK(3); |
| 170 | SSPUSHPTR(gv); |
| 171 | SSPUSHPTR(GvHVn(gv)); |
| 172 | SSPUSHINT(SAVEt_HV); |
| 173 | |
| 174 | GvHV(gv) = Null(HV*); |
| 175 | return GvHVn(gv); |
| 176 | } |
| 177 | |
| 178 | void |
| 179 | save_item(item) |
| 180 | register SV *item; |
| 181 | { |
| 182 | register SV *sv; |
| 183 | |
| 184 | SSCHECK(3); |
| 185 | SSPUSHPTR(item); /* remember the pointer */ |
| 186 | sv = NEWSV(0,0); |
| 187 | sv_setsv(sv,item); |
| 188 | SSPUSHPTR(sv); /* remember the value */ |
| 189 | SSPUSHINT(SAVEt_ITEM); |
| 190 | } |
| 191 | |
| 192 | void |
| 193 | save_int(intp) |
| 194 | int *intp; |
| 195 | { |
| 196 | SSCHECK(3); |
| 197 | SSPUSHINT(*intp); |
| 198 | SSPUSHPTR(intp); |
| 199 | SSPUSHINT(SAVEt_INT); |
| 200 | } |
| 201 | |
| 202 | void |
| 203 | save_I32(intp) |
| 204 | I32 *intp; |
| 205 | { |
| 206 | SSCHECK(3); |
| 207 | SSPUSHINT(*intp); |
| 208 | SSPUSHPTR(intp); |
| 209 | SSPUSHINT(SAVEt_I32); |
| 210 | } |
| 211 | |
| 212 | void |
| 213 | save_sptr(sptr) |
| 214 | SV **sptr; |
| 215 | { |
| 216 | SSCHECK(3); |
| 217 | SSPUSHPTR(*sptr); |
| 218 | SSPUSHPTR(sptr); |
| 219 | SSPUSHINT(SAVEt_SPTR); |
| 220 | } |
| 221 | |
| 222 | void |
| 223 | save_nogv(gv) |
| 224 | GV *gv; |
| 225 | { |
| 226 | SSCHECK(2); |
| 227 | SSPUSHPTR(gv); |
| 228 | SSPUSHINT(SAVEt_NSTAB); |
| 229 | } |
| 230 | |
| 231 | void |
| 232 | save_hptr(hptr) |
| 233 | HV **hptr; |
| 234 | { |
| 235 | SSCHECK(3); |
| 236 | SSPUSHINT(*hptr); |
| 237 | SSPUSHPTR(hptr); |
| 238 | SSPUSHINT(SAVEt_HPTR); |
| 239 | } |
| 240 | |
| 241 | void |
| 242 | save_aptr(aptr) |
| 243 | AV **aptr; |
| 244 | { |
| 245 | SSCHECK(3); |
| 246 | SSPUSHINT(*aptr); |
| 247 | SSPUSHPTR(aptr); |
| 248 | SSPUSHINT(SAVEt_APTR); |
| 249 | } |
| 250 | |
| 251 | void |
| 252 | save_freesv(sv) |
| 253 | SV *sv; |
| 254 | { |
| 255 | SSCHECK(2); |
| 256 | SSPUSHPTR(sv); |
| 257 | SSPUSHINT(SAVEt_FREESV); |
| 258 | } |
| 259 | |
| 260 | void |
| 261 | save_freeop(op) |
| 262 | OP *op; |
| 263 | { |
| 264 | SSCHECK(2); |
| 265 | SSPUSHPTR(op); |
| 266 | SSPUSHINT(SAVEt_FREEOP); |
| 267 | } |
| 268 | |
| 269 | void |
| 270 | save_freepv(pv) |
| 271 | char *pv; |
| 272 | { |
| 273 | SSCHECK(2); |
| 274 | SSPUSHPTR(pv); |
| 275 | SSPUSHINT(SAVEt_FREEPV); |
| 276 | } |
| 277 | |
| 278 | void |
| 279 | save_clearsv(svp) |
| 280 | SV** svp; |
| 281 | { |
| 282 | SSCHECK(2); |
| 283 | SSPUSHPTR(svp); |
| 284 | SSPUSHINT(SAVEt_CLEARSV); |
| 285 | } |
| 286 | |
| 287 | void |
| 288 | save_delete(hv,key,klen) |
| 289 | HV *hv; |
| 290 | char *key; |
| 291 | I32 klen; |
| 292 | { |
| 293 | SSCHECK(4); |
| 294 | SSPUSHINT(klen); |
| 295 | SSPUSHPTR(key); |
| 296 | SSPUSHPTR(hv); |
| 297 | SSPUSHINT(SAVEt_DELETE); |
| 298 | } |
| 299 | |
| 300 | void |
| 301 | save_list(sarg,maxsarg) |
| 302 | register SV **sarg; |
| 303 | I32 maxsarg; |
| 304 | { |
| 305 | register SV *sv; |
| 306 | register I32 i; |
| 307 | |
| 308 | SSCHECK(3 * maxsarg); |
| 309 | for (i = 1; i <= maxsarg; i++) { |
| 310 | SSPUSHPTR(sarg[i]); /* remember the pointer */ |
| 311 | sv = NEWSV(0,0); |
| 312 | sv_setsv(sv,sarg[i]); |
| 313 | SSPUSHPTR(sv); /* remember the value */ |
| 314 | SSPUSHINT(SAVEt_ITEM); |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | void |
| 319 | leave_scope(base) |
| 320 | I32 base; |
| 321 | { |
| 322 | register SV *sv; |
| 323 | register SV *value; |
| 324 | register GV *gv; |
| 325 | register AV *av; |
| 326 | register HV *hv; |
| 327 | register void* ptr; |
| 328 | |
| 329 | if (base < -1) |
| 330 | croak("panic: corrupt saved stack index"); |
| 331 | while (savestack_ix > base) { |
| 332 | switch (SSPOPINT) { |
| 333 | case SAVEt_ITEM: /* normal string */ |
| 334 | value = (SV*)SSPOPPTR; |
| 335 | sv = (SV*)SSPOPPTR; |
| 336 | sv_replace(sv,value); |
| 337 | SvSETMAGIC(sv); |
| 338 | break; |
| 339 | case SAVEt_SV: /* scalar reference */ |
| 340 | value = (SV*)SSPOPPTR; |
| 341 | gv = (GV*)SSPOPPTR; |
| 342 | sv = GvSV(gv); |
| 343 | if (SvTYPE(sv) >= SVt_PVMG) |
| 344 | SvMAGIC(sv) = 0; |
| 345 | SvREFCNT_dec(sv); |
| 346 | GvSV(gv) = sv = value; |
| 347 | SvSETMAGIC(sv); |
| 348 | break; |
| 349 | case SAVEt_SVREF: /* scalar reference */ |
| 350 | ptr = SSPOPPTR; |
| 351 | sv = *(SV**)ptr; |
| 352 | if (SvTYPE(sv) >= SVt_PVMG) |
| 353 | SvMAGIC(sv) = 0; |
| 354 | SvREFCNT_dec(sv); |
| 355 | *(SV**)ptr = sv = (SV*)SSPOPPTR; |
| 356 | SvSETMAGIC(sv); |
| 357 | break; |
| 358 | case SAVEt_AV: /* array reference */ |
| 359 | av = (AV*)SSPOPPTR; |
| 360 | gv = (GV*)SSPOPPTR; |
| 361 | SvREFCNT_dec(GvAV(gv)); |
| 362 | GvAV(gv) = av; |
| 363 | break; |
| 364 | case SAVEt_HV: /* hash reference */ |
| 365 | hv = (HV*)SSPOPPTR; |
| 366 | gv = (GV*)SSPOPPTR; |
| 367 | SvREFCNT_dec(GvHV(gv)); |
| 368 | GvHV(gv) = hv; |
| 369 | break; |
| 370 | case SAVEt_INT: /* int reference */ |
| 371 | ptr = SSPOPPTR; |
| 372 | *(int*)ptr = (int)SSPOPINT; |
| 373 | break; |
| 374 | case SAVEt_I32: /* I32 reference */ |
| 375 | ptr = SSPOPPTR; |
| 376 | *(I32*)ptr = (I32)SSPOPINT; |
| 377 | break; |
| 378 | case SAVEt_SPTR: /* SV* reference */ |
| 379 | ptr = SSPOPPTR; |
| 380 | *(SV**)ptr = (SV*)SSPOPPTR; |
| 381 | break; |
| 382 | case SAVEt_HPTR: /* HV* reference */ |
| 383 | ptr = SSPOPPTR; |
| 384 | *(HV**)ptr = (HV*)SSPOPPTR; |
| 385 | break; |
| 386 | case SAVEt_APTR: /* AV* reference */ |
| 387 | ptr = SSPOPPTR; |
| 388 | *(AV**)ptr = (AV*)SSPOPPTR; |
| 389 | break; |
| 390 | case SAVEt_NSTAB: |
| 391 | gv = (GV*)SSPOPPTR; |
| 392 | (void)sv_clear(gv); |
| 393 | break; |
| 394 | case SAVEt_GP: /* scalar reference */ |
| 395 | ptr = SSPOPPTR; |
| 396 | gv = (GV*)SSPOPPTR; |
| 397 | gp_free(gv); |
| 398 | GvGP(gv) = (GP*)ptr; |
| 399 | break; |
| 400 | case SAVEt_FREESV: |
| 401 | ptr = SSPOPPTR; |
| 402 | SvREFCNT_dec((SV*)ptr); |
| 403 | break; |
| 404 | case SAVEt_FREEOP: |
| 405 | ptr = SSPOPPTR; |
| 406 | curpad = AvARRAY(comppad); |
| 407 | op_free((OP*)ptr); |
| 408 | break; |
| 409 | case SAVEt_FREEPV: |
| 410 | ptr = SSPOPPTR; |
| 411 | Safefree((char*)ptr); |
| 412 | break; |
| 413 | case SAVEt_CLEARSV: |
| 414 | ptr = SSPOPPTR; |
| 415 | sv = *(SV**)ptr; |
| 416 | if (SvREFCNT(sv) <= 1) { /* Can clear pad variable in place. */ |
| 417 | if (SvTHINKFIRST(sv)) { |
| 418 | if (SvREADONLY(sv)) |
| 419 | croak("panic: leave_scope clearsv"); |
| 420 | if (SvROK(sv)) |
| 421 | sv_unref(sv); |
| 422 | } |
| 423 | |
| 424 | switch (SvTYPE(sv)) { |
| 425 | case SVt_NULL: |
| 426 | break; |
| 427 | case SVt_PVAV: |
| 428 | av_clear((AV*)sv); |
| 429 | break; |
| 430 | case SVt_PVHV: |
| 431 | hv_clear((HV*)sv); |
| 432 | break; |
| 433 | case SVt_PVCV: |
| 434 | sub_generation++; |
| 435 | cv_clear((CV*)sv); |
| 436 | break; |
| 437 | default: |
| 438 | if (SvPOK(sv) && SvLEN(sv)) |
| 439 | SvOOK_off(sv); |
| 440 | SvOK_off(sv); |
| 441 | SvSETMAGIC(sv); |
| 442 | break; |
| 443 | } |
| 444 | } |
| 445 | else { /* Someone has a claim on this, so abandon it. */ |
| 446 | SvREFCNT_dec(sv); /* Cast current value to the winds. */ |
| 447 | switch (SvTYPE(sv)) { /* Console ourselves with a new value */ |
| 448 | case SVt_PVAV: *(SV**)ptr = (SV*)newAV(); break; |
| 449 | case SVt_PVHV: *(SV**)ptr = (SV*)newHV(); break; |
| 450 | default: *(SV**)ptr = NEWSV(0,0); break; |
| 451 | } |
| 452 | } |
| 453 | break; |
| 454 | case SAVEt_DELETE: |
| 455 | ptr = SSPOPPTR; |
| 456 | hv = (HV*)ptr; |
| 457 | ptr = SSPOPPTR; |
| 458 | hv_delete(hv, (char*)ptr, (U32)SSPOPINT); |
| 459 | break; |
| 460 | default: |
| 461 | croak("panic: leave_scope inconsistency"); |
| 462 | } |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | #ifdef DEBUGGING |
| 467 | void |
| 468 | cx_dump(cx) |
| 469 | CONTEXT* cx; |
| 470 | { |
| 471 | fprintf(stderr, "CX %d = %s\n", cx - cxstack, block_type[cx->cx_type]); |
| 472 | if (cx->cx_type != CXt_SUBST) { |
| 473 | fprintf(stderr, "BLK_OLDSP = %ld\n", (long)cx->blk_oldsp); |
| 474 | fprintf(stderr, "BLK_OLDCOP = 0x%lx\n", (long)cx->blk_oldcop); |
| 475 | fprintf(stderr, "BLK_OLDMARKSP = %ld\n", (long)cx->blk_oldmarksp); |
| 476 | fprintf(stderr, "BLK_OLDSCOPESP = %ld\n", (long)cx->blk_oldscopesp); |
| 477 | fprintf(stderr, "BLK_OLDRETSP = %ld\n", (long)cx->blk_oldretsp); |
| 478 | fprintf(stderr, "BLK_OLDPM = 0x%lx\n", (long)cx->blk_oldpm); |
| 479 | fprintf(stderr, "BLK_GIMME = %s\n", cx->blk_gimme ? "LIST" : "SCALAR"); |
| 480 | } |
| 481 | switch (cx->cx_type) { |
| 482 | case CXt_NULL: |
| 483 | case CXt_BLOCK: |
| 484 | break; |
| 485 | case CXt_SUB: |
| 486 | fprintf(stderr, "BLK_SUB.CV = 0x%lx\n", |
| 487 | (long)cx->blk_sub.cv); |
| 488 | fprintf(stderr, "BLK_SUB.GV = 0x%lx\n", |
| 489 | (long)cx->blk_sub.gv); |
| 490 | fprintf(stderr, "BLK_SUB.DFOUTGV = 0x%lx\n", |
| 491 | (long)cx->blk_sub.dfoutgv); |
| 492 | fprintf(stderr, "BLK_SUB.OLDDEPTH = %ld\n", |
| 493 | (long)cx->blk_sub.olddepth); |
| 494 | fprintf(stderr, "BLK_SUB.HASARGS = %d\n", |
| 495 | (int)cx->blk_sub.hasargs); |
| 496 | break; |
| 497 | case CXt_EVAL: |
| 498 | fprintf(stderr, "BLK_EVAL.OLD_IN_EVAL = %ld\n", |
| 499 | (long)cx->blk_eval.old_in_eval); |
| 500 | fprintf(stderr, "BLK_EVAL.OLD_OP_TYPE = %s\n", |
| 501 | op_name[cx->blk_eval.old_op_type]); |
| 502 | fprintf(stderr, "BLK_EVAL.OLD_NAME = %s\n", |
| 503 | cx->blk_eval.old_name); |
| 504 | fprintf(stderr, "BLK_EVAL.OLD_EVAL_ROOT = 0x%lx\n", |
| 505 | (long)cx->blk_eval.old_eval_root); |
| 506 | break; |
| 507 | |
| 508 | case CXt_LOOP: |
| 509 | fprintf(stderr, "BLK_LOOP.LABEL = %s\n", |
| 510 | cx->blk_loop.label); |
| 511 | fprintf(stderr, "BLK_LOOP.RESETSP = %ld\n", |
| 512 | (long)cx->blk_loop.resetsp); |
| 513 | fprintf(stderr, "BLK_LOOP.REDO_OP = 0x%lx\n", |
| 514 | (long)cx->blk_loop.redo_op); |
| 515 | fprintf(stderr, "BLK_LOOP.NEXT_OP = 0x%lx\n", |
| 516 | (long)cx->blk_loop.next_op); |
| 517 | fprintf(stderr, "BLK_LOOP.LAST_OP = 0x%lx\n", |
| 518 | (long)cx->blk_loop.last_op); |
| 519 | fprintf(stderr, "BLK_LOOP.ITERIX = %ld\n", |
| 520 | (long)cx->blk_loop.iterix); |
| 521 | fprintf(stderr, "BLK_LOOP.ITERARY = 0x%lx\n", |
| 522 | (long)cx->blk_loop.iterary); |
| 523 | fprintf(stderr, "BLK_LOOP.ITERVAR = 0x%lx\n", |
| 524 | (long)cx->blk_loop.itervar); |
| 525 | if (cx->blk_loop.itervar) |
| 526 | fprintf(stderr, "BLK_LOOP.ITERSAVE = 0x%lx\n", |
| 527 | (long)cx->blk_loop.itersave); |
| 528 | break; |
| 529 | |
| 530 | case CXt_SUBST: |
| 531 | fprintf(stderr, "SB_ITERS = %ld\n", |
| 532 | (long)cx->sb_iters); |
| 533 | fprintf(stderr, "SB_MAXITERS = %ld\n", |
| 534 | (long)cx->sb_maxiters); |
| 535 | fprintf(stderr, "SB_SAFEBASE = %ld\n", |
| 536 | (long)cx->sb_safebase); |
| 537 | fprintf(stderr, "SB_ONCE = %ld\n", |
| 538 | (long)cx->sb_once); |
| 539 | fprintf(stderr, "SB_ORIG = %s\n", |
| 540 | cx->sb_orig); |
| 541 | fprintf(stderr, "SB_DSTR = 0x%lx\n", |
| 542 | (long)cx->sb_dstr); |
| 543 | fprintf(stderr, "SB_TARG = 0x%lx\n", |
| 544 | (long)cx->sb_targ); |
| 545 | fprintf(stderr, "SB_S = 0x%lx\n", |
| 546 | (long)cx->sb_s); |
| 547 | fprintf(stderr, "SB_M = 0x%lx\n", |
| 548 | (long)cx->sb_m); |
| 549 | fprintf(stderr, "SB_STREND = 0x%lx\n", |
| 550 | (long)cx->sb_strend); |
| 551 | fprintf(stderr, "SB_SUBBASE = 0x%lx\n", |
| 552 | (long)cx->sb_subbase); |
| 553 | break; |
| 554 | } |
| 555 | } |
| 556 | #endif |