| 1 | /* universal.c |
| 2 | * |
| 3 | * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, |
| 4 | * 2005, 2006, 2007, 2008 by Larry Wall and others |
| 5 | * |
| 6 | * You may distribute under the terms of either the GNU General Public |
| 7 | * License or the Artistic License, as specified in the README file. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * '"The roots of those mountains must be roots indeed; there must be |
| 13 | * great secrets buried there which have not been discovered since the |
| 14 | * beginning."' --Gandalf, relating Gollum's history |
| 15 | * |
| 16 | * [p.54 of _The Lord of the Rings_, I/ii: "The Shadow of the Past"] |
| 17 | */ |
| 18 | |
| 19 | /* This file contains the code that implements the functions in Perl's |
| 20 | * UNIVERSAL package, such as UNIVERSAL->can(). |
| 21 | * |
| 22 | * It is also used to store XS functions that need to be present in |
| 23 | * miniperl for a lack of a better place to put them. It might be |
| 24 | * clever to move them to separate XS files which would then be pulled |
| 25 | * in by some to-be-written build process. |
| 26 | */ |
| 27 | |
| 28 | #include "EXTERN.h" |
| 29 | #define PERL_IN_UNIVERSAL_C |
| 30 | #include "perl.h" |
| 31 | |
| 32 | #if defined(USE_PERLIO) |
| 33 | #include "perliol.h" /* For the PERLIO_F_XXX */ |
| 34 | #endif |
| 35 | |
| 36 | /* |
| 37 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> |
| 38 | * The main guts of traverse_isa was actually copied from gv_fetchmeth |
| 39 | */ |
| 40 | |
| 41 | STATIC bool |
| 42 | S_isa_lookup(pTHX_ HV *stash, const char * const name, STRLEN len, U32 flags) |
| 43 | { |
| 44 | dVAR; |
| 45 | const struct mro_meta *const meta = HvMROMETA(stash); |
| 46 | HV *isa = meta->isa; |
| 47 | const HV *our_stash; |
| 48 | |
| 49 | PERL_ARGS_ASSERT_ISA_LOOKUP; |
| 50 | |
| 51 | if (!isa) { |
| 52 | (void)mro_get_linear_isa(stash); |
| 53 | isa = meta->isa; |
| 54 | } |
| 55 | |
| 56 | if (hv_common(isa, NULL, name, len, ( flags & SVf_UTF8 ? HVhek_UTF8 : 0), |
| 57 | HV_FETCH_ISEXISTS, NULL, 0)) { |
| 58 | /* Direct name lookup worked. */ |
| 59 | return TRUE; |
| 60 | } |
| 61 | |
| 62 | /* A stash/class can go by many names (ie. User == main::User), so |
| 63 | we use the HvENAME in the stash itself, which is canonical, falling |
| 64 | back to HvNAME if necessary. */ |
| 65 | our_stash = gv_stashpvn(name, len, flags); |
| 66 | |
| 67 | if (our_stash) { |
| 68 | HEK *canon_name = HvENAME_HEK(our_stash); |
| 69 | if (!canon_name) canon_name = HvNAME_HEK(our_stash); |
| 70 | |
| 71 | if (hv_common(isa, NULL, HEK_KEY(canon_name), HEK_LEN(canon_name), |
| 72 | HEK_FLAGS(canon_name), |
| 73 | HV_FETCH_ISEXISTS, NULL, HEK_HASH(canon_name))) { |
| 74 | return TRUE; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | return FALSE; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | =head1 SV Manipulation Functions |
| 83 | |
| 84 | =for apidoc sv_derived_from_pvn |
| 85 | |
| 86 | Returns a boolean indicating whether the SV is derived from the specified class |
| 87 | I<at the C level>. To check derivation at the Perl level, call C<isa()> as a |
| 88 | normal Perl method. |
| 89 | |
| 90 | Currently, the only significant value for C<flags> is SVf_UTF8. |
| 91 | |
| 92 | =cut |
| 93 | |
| 94 | =for apidoc sv_derived_from_sv |
| 95 | |
| 96 | Exactly like L</sv_derived_from_pvn>, but takes the name string in the form |
| 97 | of an SV instead of a string/length pair. |
| 98 | |
| 99 | =cut |
| 100 | |
| 101 | */ |
| 102 | |
| 103 | bool |
| 104 | Perl_sv_derived_from_sv(pTHX_ SV *sv, SV *namesv, U32 flags) |
| 105 | { |
| 106 | char *namepv; |
| 107 | STRLEN namelen; |
| 108 | PERL_ARGS_ASSERT_SV_DERIVED_FROM_SV; |
| 109 | namepv = SvPV(namesv, namelen); |
| 110 | if (SvUTF8(namesv)) |
| 111 | flags |= SVf_UTF8; |
| 112 | return sv_derived_from_pvn(sv, namepv, namelen, flags); |
| 113 | } |
| 114 | |
| 115 | /* |
| 116 | =for apidoc sv_derived_from |
| 117 | |
| 118 | Exactly like L</sv_derived_from_pv>, but doesn't take a C<flags> parameter. |
| 119 | |
| 120 | =cut |
| 121 | */ |
| 122 | |
| 123 | bool |
| 124 | Perl_sv_derived_from(pTHX_ SV *sv, const char *const name) |
| 125 | { |
| 126 | PERL_ARGS_ASSERT_SV_DERIVED_FROM; |
| 127 | return sv_derived_from_pvn(sv, name, strlen(name), 0); |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | =for apidoc sv_derived_from_pv |
| 132 | |
| 133 | Exactly like L</sv_derived_from_pvn>, but takes a nul-terminated string |
| 134 | instead of a string/length pair. |
| 135 | |
| 136 | =cut |
| 137 | */ |
| 138 | |
| 139 | |
| 140 | bool |
| 141 | Perl_sv_derived_from_pv(pTHX_ SV *sv, const char *const name, U32 flags) |
| 142 | { |
| 143 | PERL_ARGS_ASSERT_SV_DERIVED_FROM_PV; |
| 144 | return sv_derived_from_pvn(sv, name, strlen(name), flags); |
| 145 | } |
| 146 | |
| 147 | bool |
| 148 | Perl_sv_derived_from_pvn(pTHX_ SV *sv, const char *const name, const STRLEN len, U32 flags) |
| 149 | { |
| 150 | dVAR; |
| 151 | HV *stash; |
| 152 | |
| 153 | PERL_ARGS_ASSERT_SV_DERIVED_FROM_PVN; |
| 154 | |
| 155 | SvGETMAGIC(sv); |
| 156 | |
| 157 | if (SvROK(sv)) { |
| 158 | const char *type; |
| 159 | sv = SvRV(sv); |
| 160 | type = sv_reftype(sv,0); |
| 161 | if (type && strEQ(type,name)) |
| 162 | return TRUE; |
| 163 | if (!SvOBJECT(sv)) |
| 164 | return FALSE; |
| 165 | stash = SvSTASH(sv); |
| 166 | } |
| 167 | else { |
| 168 | stash = gv_stashsv(sv, 0); |
| 169 | } |
| 170 | |
| 171 | if (stash && isa_lookup(stash, name, len, flags)) |
| 172 | return TRUE; |
| 173 | |
| 174 | stash = gv_stashpvs("UNIVERSAL", 0); |
| 175 | return stash && isa_lookup(stash, name, len, flags); |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | =for apidoc sv_does_sv |
| 180 | |
| 181 | Returns a boolean indicating whether the SV performs a specific, named role. |
| 182 | The SV can be a Perl object or the name of a Perl class. |
| 183 | |
| 184 | =cut |
| 185 | */ |
| 186 | |
| 187 | #include "XSUB.h" |
| 188 | |
| 189 | bool |
| 190 | Perl_sv_does_sv(pTHX_ SV *sv, SV *namesv, U32 flags) |
| 191 | { |
| 192 | SV *classname; |
| 193 | bool does_it; |
| 194 | SV *methodname; |
| 195 | dSP; |
| 196 | |
| 197 | PERL_ARGS_ASSERT_SV_DOES_SV; |
| 198 | PERL_UNUSED_ARG(flags); |
| 199 | |
| 200 | ENTER; |
| 201 | SAVETMPS; |
| 202 | |
| 203 | SvGETMAGIC(sv); |
| 204 | |
| 205 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) { |
| 206 | LEAVE; |
| 207 | return FALSE; |
| 208 | } |
| 209 | |
| 210 | if (sv_isobject(sv)) { |
| 211 | classname = sv_ref(NULL,SvRV(sv),TRUE); |
| 212 | } else { |
| 213 | classname = sv; |
| 214 | } |
| 215 | |
| 216 | if (sv_eq(classname, namesv)) { |
| 217 | LEAVE; |
| 218 | return TRUE; |
| 219 | } |
| 220 | |
| 221 | PUSHMARK(SP); |
| 222 | EXTEND(SP, 2); |
| 223 | PUSHs(sv); |
| 224 | PUSHs(namesv); |
| 225 | PUTBACK; |
| 226 | |
| 227 | methodname = newSVpvs_flags("isa", SVs_TEMP); |
| 228 | /* ugly hack: use the SvSCREAM flag so S_method_common |
| 229 | * can figure out we're calling DOES() and not isa(), |
| 230 | * and report eventual errors correctly. --rgs */ |
| 231 | SvSCREAM_on(methodname); |
| 232 | call_sv(methodname, G_SCALAR | G_METHOD); |
| 233 | SPAGAIN; |
| 234 | |
| 235 | does_it = SvTRUE( TOPs ); |
| 236 | FREETMPS; |
| 237 | LEAVE; |
| 238 | |
| 239 | return does_it; |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | =for apidoc sv_does |
| 244 | |
| 245 | Like L</sv_does_pv>, but doesn't take a C<flags> parameter. |
| 246 | |
| 247 | =cut |
| 248 | */ |
| 249 | |
| 250 | bool |
| 251 | Perl_sv_does(pTHX_ SV *sv, const char *const name) |
| 252 | { |
| 253 | PERL_ARGS_ASSERT_SV_DOES; |
| 254 | return sv_does_sv(sv, newSVpvn_flags(name, strlen(name), SVs_TEMP), 0); |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | =for apidoc sv_does_pv |
| 259 | |
| 260 | Like L</sv_does_sv>, but takes a nul-terminated string instead of an SV. |
| 261 | |
| 262 | =cut |
| 263 | */ |
| 264 | |
| 265 | |
| 266 | bool |
| 267 | Perl_sv_does_pv(pTHX_ SV *sv, const char *const name, U32 flags) |
| 268 | { |
| 269 | PERL_ARGS_ASSERT_SV_DOES_PV; |
| 270 | return sv_does_sv(sv, newSVpvn_flags(name, strlen(name), SVs_TEMP | flags), flags); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | =for apidoc sv_does_pvn |
| 275 | |
| 276 | Like L</sv_does_sv>, but takes a string/length pair instead of an SV. |
| 277 | |
| 278 | =cut |
| 279 | */ |
| 280 | |
| 281 | bool |
| 282 | Perl_sv_does_pvn(pTHX_ SV *sv, const char *const name, const STRLEN len, U32 flags) |
| 283 | { |
| 284 | PERL_ARGS_ASSERT_SV_DOES_PVN; |
| 285 | |
| 286 | return sv_does_sv(sv, newSVpvn_flags(name, len, flags | SVs_TEMP), flags); |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | =for apidoc croak_xs_usage |
| 291 | |
| 292 | A specialised variant of C<croak()> for emitting the usage message for xsubs |
| 293 | |
| 294 | croak_xs_usage(cv, "eee_yow"); |
| 295 | |
| 296 | works out the package name and subroutine name from C<cv>, and then calls |
| 297 | C<croak()>. Hence if C<cv> is C<&ouch::awk>, it would call C<croak> as: |
| 298 | |
| 299 | Perl_croak(aTHX_ "Usage: %"SVf"::%"SVf"(%s)", "ouch" "awk", "eee_yow"); |
| 300 | |
| 301 | =cut |
| 302 | */ |
| 303 | |
| 304 | void |
| 305 | Perl_croak_xs_usage(const CV *const cv, const char *const params) |
| 306 | { |
| 307 | const GV *const gv = CvGV(cv); |
| 308 | |
| 309 | PERL_ARGS_ASSERT_CROAK_XS_USAGE; |
| 310 | |
| 311 | if (gv) { |
| 312 | const HV *const stash = GvSTASH(gv); |
| 313 | |
| 314 | if (HvNAME_get(stash)) |
| 315 | /* diag_listed_as: SKIPME */ |
| 316 | Perl_croak_nocontext("Usage: %"HEKf"::%"HEKf"(%s)", |
| 317 | HEKfARG(HvNAME_HEK(stash)), |
| 318 | HEKfARG(GvNAME_HEK(gv)), |
| 319 | params); |
| 320 | else |
| 321 | /* diag_listed_as: SKIPME */ |
| 322 | Perl_croak_nocontext("Usage: %"HEKf"(%s)", |
| 323 | HEKfARG(GvNAME_HEK(gv)), params); |
| 324 | } else { |
| 325 | /* Pants. I don't think that it should be possible to get here. */ |
| 326 | /* diag_listed_as: SKIPME */ |
| 327 | Perl_croak_nocontext("Usage: CODE(0x%"UVxf")(%s)", PTR2UV(cv), params); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | XS(XS_UNIVERSAL_isa) |
| 332 | { |
| 333 | dVAR; |
| 334 | dXSARGS; |
| 335 | |
| 336 | if (items != 2) |
| 337 | croak_xs_usage(cv, "reference, kind"); |
| 338 | else { |
| 339 | SV * const sv = ST(0); |
| 340 | |
| 341 | SvGETMAGIC(sv); |
| 342 | |
| 343 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
| 344 | XSRETURN_UNDEF; |
| 345 | |
| 346 | ST(0) = boolSV(sv_derived_from_sv(sv, ST(1), 0)); |
| 347 | XSRETURN(1); |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | XS(XS_UNIVERSAL_can) |
| 352 | { |
| 353 | dVAR; |
| 354 | dXSARGS; |
| 355 | SV *sv; |
| 356 | SV *rv; |
| 357 | HV *pkg = NULL; |
| 358 | GV *iogv; |
| 359 | |
| 360 | if (items != 2) |
| 361 | croak_xs_usage(cv, "object-ref, method"); |
| 362 | |
| 363 | sv = ST(0); |
| 364 | |
| 365 | SvGETMAGIC(sv); |
| 366 | |
| 367 | /* Reject undef and empty string. Note that the string form takes |
| 368 | precedence here over the numeric form, as (!1)->foo treats the |
| 369 | invocant as the empty string, though it is a dualvar. */ |
| 370 | if (!SvOK(sv) || (SvPOK(sv) && !SvCUR(sv))) |
| 371 | XSRETURN_UNDEF; |
| 372 | |
| 373 | rv = &PL_sv_undef; |
| 374 | |
| 375 | if (SvROK(sv)) { |
| 376 | sv = MUTABLE_SV(SvRV(sv)); |
| 377 | if (SvOBJECT(sv)) |
| 378 | pkg = SvSTASH(sv); |
| 379 | else if (isGV_with_GP(sv) && GvIO(sv)) |
| 380 | pkg = SvSTASH(GvIO(sv)); |
| 381 | } |
| 382 | else if (isGV_with_GP(sv) && GvIO(sv)) |
| 383 | pkg = SvSTASH(GvIO(sv)); |
| 384 | else if ((iogv = gv_fetchsv_nomg(sv, 0, SVt_PVIO)) && GvIO(iogv)) |
| 385 | pkg = SvSTASH(GvIO(iogv)); |
| 386 | else { |
| 387 | pkg = gv_stashsv(sv, 0); |
| 388 | if (!pkg) |
| 389 | pkg = gv_stashpv("UNIVERSAL", 0); |
| 390 | } |
| 391 | |
| 392 | if (pkg) { |
| 393 | GV * const gv = gv_fetchmethod_sv_flags(pkg, ST(1), 0); |
| 394 | if (gv && isGV(gv)) |
| 395 | rv = sv_2mortal(newRV(MUTABLE_SV(GvCV(gv)))); |
| 396 | } |
| 397 | |
| 398 | ST(0) = rv; |
| 399 | XSRETURN(1); |
| 400 | } |
| 401 | |
| 402 | XS(XS_UNIVERSAL_DOES) |
| 403 | { |
| 404 | dVAR; |
| 405 | dXSARGS; |
| 406 | PERL_UNUSED_ARG(cv); |
| 407 | |
| 408 | if (items != 2) |
| 409 | Perl_croak(aTHX_ "Usage: invocant->DOES(kind)"); |
| 410 | else { |
| 411 | SV * const sv = ST(0); |
| 412 | if (sv_does_sv( sv, ST(1), 0 )) |
| 413 | XSRETURN_YES; |
| 414 | |
| 415 | XSRETURN_NO; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | XS(XS_utf8_is_utf8) |
| 420 | { |
| 421 | dVAR; |
| 422 | dXSARGS; |
| 423 | if (items != 1) |
| 424 | croak_xs_usage(cv, "sv"); |
| 425 | else { |
| 426 | SV * const sv = ST(0); |
| 427 | SvGETMAGIC(sv); |
| 428 | if (SvUTF8(sv)) |
| 429 | XSRETURN_YES; |
| 430 | else |
| 431 | XSRETURN_NO; |
| 432 | } |
| 433 | XSRETURN_EMPTY; |
| 434 | } |
| 435 | |
| 436 | XS(XS_utf8_valid) |
| 437 | { |
| 438 | dVAR; |
| 439 | dXSARGS; |
| 440 | if (items != 1) |
| 441 | croak_xs_usage(cv, "sv"); |
| 442 | else { |
| 443 | SV * const sv = ST(0); |
| 444 | STRLEN len; |
| 445 | const char * const s = SvPV_const(sv,len); |
| 446 | if (!SvUTF8(sv) || is_utf8_string((const U8*)s,len)) |
| 447 | XSRETURN_YES; |
| 448 | else |
| 449 | XSRETURN_NO; |
| 450 | } |
| 451 | XSRETURN_EMPTY; |
| 452 | } |
| 453 | |
| 454 | XS(XS_utf8_encode) |
| 455 | { |
| 456 | dVAR; |
| 457 | dXSARGS; |
| 458 | if (items != 1) |
| 459 | croak_xs_usage(cv, "sv"); |
| 460 | sv_utf8_encode(ST(0)); |
| 461 | SvSETMAGIC(ST(0)); |
| 462 | XSRETURN_EMPTY; |
| 463 | } |
| 464 | |
| 465 | XS(XS_utf8_decode) |
| 466 | { |
| 467 | dVAR; |
| 468 | dXSARGS; |
| 469 | if (items != 1) |
| 470 | croak_xs_usage(cv, "sv"); |
| 471 | else { |
| 472 | SV * const sv = ST(0); |
| 473 | bool RETVAL; |
| 474 | SvPV_force_nolen(sv); |
| 475 | RETVAL = sv_utf8_decode(sv); |
| 476 | SvSETMAGIC(sv); |
| 477 | ST(0) = boolSV(RETVAL); |
| 478 | } |
| 479 | XSRETURN(1); |
| 480 | } |
| 481 | |
| 482 | XS(XS_utf8_upgrade) |
| 483 | { |
| 484 | dVAR; |
| 485 | dXSARGS; |
| 486 | if (items != 1) |
| 487 | croak_xs_usage(cv, "sv"); |
| 488 | else { |
| 489 | SV * const sv = ST(0); |
| 490 | STRLEN RETVAL; |
| 491 | dXSTARG; |
| 492 | |
| 493 | RETVAL = sv_utf8_upgrade(sv); |
| 494 | XSprePUSH; PUSHi((IV)RETVAL); |
| 495 | } |
| 496 | XSRETURN(1); |
| 497 | } |
| 498 | |
| 499 | XS(XS_utf8_downgrade) |
| 500 | { |
| 501 | dVAR; |
| 502 | dXSARGS; |
| 503 | if (items < 1 || items > 2) |
| 504 | croak_xs_usage(cv, "sv, failok=0"); |
| 505 | else { |
| 506 | SV * const sv = ST(0); |
| 507 | const bool failok = (items < 2) ? 0 : (int)SvIV(ST(1)); |
| 508 | const bool RETVAL = sv_utf8_downgrade(sv, failok); |
| 509 | |
| 510 | ST(0) = boolSV(RETVAL); |
| 511 | } |
| 512 | XSRETURN(1); |
| 513 | } |
| 514 | |
| 515 | XS(XS_utf8_native_to_unicode) |
| 516 | { |
| 517 | dVAR; |
| 518 | dXSARGS; |
| 519 | const UV uv = SvUV(ST(0)); |
| 520 | |
| 521 | if (items > 1) |
| 522 | croak_xs_usage(cv, "sv"); |
| 523 | |
| 524 | ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv))); |
| 525 | XSRETURN(1); |
| 526 | } |
| 527 | |
| 528 | XS(XS_utf8_unicode_to_native) |
| 529 | { |
| 530 | dVAR; |
| 531 | dXSARGS; |
| 532 | const UV uv = SvUV(ST(0)); |
| 533 | |
| 534 | if (items > 1) |
| 535 | croak_xs_usage(cv, "sv"); |
| 536 | |
| 537 | ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv))); |
| 538 | XSRETURN(1); |
| 539 | } |
| 540 | |
| 541 | XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */ |
| 542 | { |
| 543 | dVAR; |
| 544 | dXSARGS; |
| 545 | SV * const svz = ST(0); |
| 546 | SV * sv; |
| 547 | PERL_UNUSED_ARG(cv); |
| 548 | |
| 549 | /* [perl #77776] - called as &foo() not foo() */ |
| 550 | if (!SvROK(svz)) |
| 551 | croak_xs_usage(cv, "SCALAR[, ON]"); |
| 552 | |
| 553 | sv = SvRV(svz); |
| 554 | |
| 555 | if (items == 1) { |
| 556 | if (SvREADONLY(sv)) |
| 557 | XSRETURN_YES; |
| 558 | else |
| 559 | XSRETURN_NO; |
| 560 | } |
| 561 | else if (items == 2) { |
| 562 | if (SvTRUE(ST(1))) { |
| 563 | #ifdef PERL_OLD_COPY_ON_WRITE |
| 564 | if (SvIsCOW(sv)) sv_force_normal(sv); |
| 565 | #endif |
| 566 | SvREADONLY_on(sv); |
| 567 | XSRETURN_YES; |
| 568 | } |
| 569 | else { |
| 570 | /* I hope you really know what you are doing. */ |
| 571 | SvREADONLY_off(sv); |
| 572 | XSRETURN_NO; |
| 573 | } |
| 574 | } |
| 575 | XSRETURN_UNDEF; /* Can't happen. */ |
| 576 | } |
| 577 | |
| 578 | XS(XS_constant__make_const) /* This is dangerous stuff. */ |
| 579 | { |
| 580 | dVAR; |
| 581 | dXSARGS; |
| 582 | SV * const svz = ST(0); |
| 583 | SV * sv; |
| 584 | PERL_UNUSED_ARG(cv); |
| 585 | |
| 586 | /* [perl #77776] - called as &foo() not foo() */ |
| 587 | if (!SvROK(svz) || items != 1) |
| 588 | croak_xs_usage(cv, "SCALAR"); |
| 589 | |
| 590 | sv = SvRV(svz); |
| 591 | |
| 592 | #ifdef PERL_OLD_COPY_ON_WRITE |
| 593 | if (SvIsCOW(sv)) sv_force_normal(sv); |
| 594 | #endif |
| 595 | SvREADONLY_on(sv); |
| 596 | if (SvTYPE(sv) == SVt_PVAV && AvFILLp(sv) != -1) { |
| 597 | /* for constant.pm; nobody else should be calling this |
| 598 | on arrays anyway. */ |
| 599 | SV **svp; |
| 600 | for (svp = AvARRAY(sv) + AvFILLp(sv) |
| 601 | ; svp >= AvARRAY(sv) |
| 602 | ; --svp) |
| 603 | if (*svp) SvPADTMP_on(*svp); |
| 604 | } |
| 605 | XSRETURN(0); |
| 606 | } |
| 607 | |
| 608 | XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */ |
| 609 | { |
| 610 | dVAR; |
| 611 | dXSARGS; |
| 612 | SV * const svz = ST(0); |
| 613 | SV * sv; |
| 614 | U32 refcnt; |
| 615 | PERL_UNUSED_ARG(cv); |
| 616 | |
| 617 | /* [perl #77776] - called as &foo() not foo() */ |
| 618 | if ((items != 1 && items != 2) || !SvROK(svz)) |
| 619 | croak_xs_usage(cv, "SCALAR[, REFCOUNT]"); |
| 620 | |
| 621 | sv = SvRV(svz); |
| 622 | |
| 623 | /* I hope you really know what you are doing. */ |
| 624 | /* idea is for SvREFCNT(sv) to be accessed only once */ |
| 625 | refcnt = items == 2 ? |
| 626 | /* we free one ref on exit */ |
| 627 | (SvREFCNT(sv) = SvUV(ST(1)) + 1) |
| 628 | : SvREFCNT(sv); |
| 629 | XSRETURN_UV(refcnt - 1); /* Minus the ref created for us. */ |
| 630 | |
| 631 | } |
| 632 | |
| 633 | XS(XS_Internals_hv_clear_placehold) |
| 634 | { |
| 635 | dVAR; |
| 636 | dXSARGS; |
| 637 | |
| 638 | if (items != 1 || !SvROK(ST(0))) |
| 639 | croak_xs_usage(cv, "hv"); |
| 640 | else { |
| 641 | HV * const hv = MUTABLE_HV(SvRV(ST(0))); |
| 642 | hv_clear_placeholders(hv); |
| 643 | XSRETURN(0); |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | XS(XS_PerlIO_get_layers) |
| 648 | { |
| 649 | dVAR; |
| 650 | dXSARGS; |
| 651 | if (items < 1 || items % 2 == 0) |
| 652 | croak_xs_usage(cv, "filehandle[,args]"); |
| 653 | #if defined(USE_PERLIO) |
| 654 | { |
| 655 | SV * sv; |
| 656 | GV * gv; |
| 657 | IO * io; |
| 658 | bool input = TRUE; |
| 659 | bool details = FALSE; |
| 660 | |
| 661 | if (items > 1) { |
| 662 | SV * const *svp; |
| 663 | for (svp = MARK + 2; svp <= SP; svp += 2) { |
| 664 | SV * const * const varp = svp; |
| 665 | SV * const * const valp = svp + 1; |
| 666 | STRLEN klen; |
| 667 | const char * const key = SvPV_const(*varp, klen); |
| 668 | |
| 669 | switch (*key) { |
| 670 | case 'i': |
| 671 | if (klen == 5 && memEQ(key, "input", 5)) { |
| 672 | input = SvTRUE(*valp); |
| 673 | break; |
| 674 | } |
| 675 | goto fail; |
| 676 | case 'o': |
| 677 | if (klen == 6 && memEQ(key, "output", 6)) { |
| 678 | input = !SvTRUE(*valp); |
| 679 | break; |
| 680 | } |
| 681 | goto fail; |
| 682 | case 'd': |
| 683 | if (klen == 7 && memEQ(key, "details", 7)) { |
| 684 | details = SvTRUE(*valp); |
| 685 | break; |
| 686 | } |
| 687 | goto fail; |
| 688 | default: |
| 689 | fail: |
| 690 | Perl_croak(aTHX_ |
| 691 | "get_layers: unknown argument '%s'", |
| 692 | key); |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | SP -= (items - 1); |
| 697 | } |
| 698 | |
| 699 | sv = POPs; |
| 700 | gv = MAYBE_DEREF_GV(sv); |
| 701 | |
| 702 | if (!gv && !SvROK(sv)) |
| 703 | gv = gv_fetchsv_nomg(sv, 0, SVt_PVIO); |
| 704 | |
| 705 | if (gv && (io = GvIO(gv))) { |
| 706 | AV* const av = PerlIO_get_layers(aTHX_ input ? |
| 707 | IoIFP(io) : IoOFP(io)); |
| 708 | SSize_t i; |
| 709 | const SSize_t last = av_len(av); |
| 710 | SSize_t nitem = 0; |
| 711 | |
| 712 | for (i = last; i >= 0; i -= 3) { |
| 713 | SV * const * const namsvp = av_fetch(av, i - 2, FALSE); |
| 714 | SV * const * const argsvp = av_fetch(av, i - 1, FALSE); |
| 715 | SV * const * const flgsvp = av_fetch(av, i, FALSE); |
| 716 | |
| 717 | const bool namok = namsvp && *namsvp && SvPOK(*namsvp); |
| 718 | const bool argok = argsvp && *argsvp && SvPOK(*argsvp); |
| 719 | const bool flgok = flgsvp && *flgsvp && SvIOK(*flgsvp); |
| 720 | |
| 721 | EXTEND(SP, 3); /* Three is the max in all branches: better check just once */ |
| 722 | if (details) { |
| 723 | /* Indents of 5? Yuck. */ |
| 724 | /* We know that PerlIO_get_layers creates a new SV for |
| 725 | the name and flags, so we can just take a reference |
| 726 | and "steal" it when we free the AV below. */ |
| 727 | PUSHs(namok |
| 728 | ? sv_2mortal(SvREFCNT_inc_simple_NN(*namsvp)) |
| 729 | : &PL_sv_undef); |
| 730 | PUSHs(argok |
| 731 | ? newSVpvn_flags(SvPVX_const(*argsvp), |
| 732 | SvCUR(*argsvp), |
| 733 | (SvUTF8(*argsvp) ? SVf_UTF8 : 0) |
| 734 | | SVs_TEMP) |
| 735 | : &PL_sv_undef); |
| 736 | PUSHs(flgok |
| 737 | ? sv_2mortal(SvREFCNT_inc_simple_NN(*flgsvp)) |
| 738 | : &PL_sv_undef); |
| 739 | nitem += 3; |
| 740 | } |
| 741 | else { |
| 742 | if (namok && argok) |
| 743 | PUSHs(sv_2mortal(Perl_newSVpvf(aTHX_ "%"SVf"(%"SVf")", |
| 744 | SVfARG(*namsvp), |
| 745 | SVfARG(*argsvp)))); |
| 746 | else if (namok) |
| 747 | PUSHs(sv_2mortal(SvREFCNT_inc_simple_NN(*namsvp))); |
| 748 | else |
| 749 | PUSHs(&PL_sv_undef); |
| 750 | nitem++; |
| 751 | if (flgok) { |
| 752 | const IV flags = SvIVX(*flgsvp); |
| 753 | |
| 754 | if (flags & PERLIO_F_UTF8) { |
| 755 | PUSHs(newSVpvs_flags("utf8", SVs_TEMP)); |
| 756 | nitem++; |
| 757 | } |
| 758 | } |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | SvREFCNT_dec(av); |
| 763 | |
| 764 | XSRETURN(nitem); |
| 765 | } |
| 766 | } |
| 767 | #endif |
| 768 | |
| 769 | XSRETURN(0); |
| 770 | } |
| 771 | |
| 772 | |
| 773 | XS(XS_re_is_regexp) |
| 774 | { |
| 775 | dVAR; |
| 776 | dXSARGS; |
| 777 | PERL_UNUSED_VAR(cv); |
| 778 | |
| 779 | if (items != 1) |
| 780 | croak_xs_usage(cv, "sv"); |
| 781 | |
| 782 | if (SvRXOK(ST(0))) { |
| 783 | XSRETURN_YES; |
| 784 | } else { |
| 785 | XSRETURN_NO; |
| 786 | } |
| 787 | } |
| 788 | |
| 789 | XS(XS_re_regnames_count) |
| 790 | { |
| 791 | REGEXP *rx = PL_curpm ? PM_GETRE(PL_curpm) : NULL; |
| 792 | SV * ret; |
| 793 | dVAR; |
| 794 | dXSARGS; |
| 795 | |
| 796 | if (items != 0) |
| 797 | croak_xs_usage(cv, ""); |
| 798 | |
| 799 | SP -= items; |
| 800 | PUTBACK; |
| 801 | |
| 802 | if (!rx) |
| 803 | XSRETURN_UNDEF; |
| 804 | |
| 805 | ret = CALLREG_NAMED_BUFF_COUNT(rx); |
| 806 | |
| 807 | SPAGAIN; |
| 808 | PUSHs(ret ? sv_2mortal(ret) : &PL_sv_undef); |
| 809 | XSRETURN(1); |
| 810 | } |
| 811 | |
| 812 | XS(XS_re_regname) |
| 813 | { |
| 814 | dVAR; |
| 815 | dXSARGS; |
| 816 | REGEXP * rx; |
| 817 | U32 flags; |
| 818 | SV * ret; |
| 819 | |
| 820 | if (items < 1 || items > 2) |
| 821 | croak_xs_usage(cv, "name[, all ]"); |
| 822 | |
| 823 | SP -= items; |
| 824 | PUTBACK; |
| 825 | |
| 826 | rx = PL_curpm ? PM_GETRE(PL_curpm) : NULL; |
| 827 | |
| 828 | if (!rx) |
| 829 | XSRETURN_UNDEF; |
| 830 | |
| 831 | if (items == 2 && SvTRUE(ST(1))) { |
| 832 | flags = RXapif_ALL; |
| 833 | } else { |
| 834 | flags = RXapif_ONE; |
| 835 | } |
| 836 | ret = CALLREG_NAMED_BUFF_FETCH(rx, ST(0), (flags | RXapif_REGNAME)); |
| 837 | |
| 838 | SPAGAIN; |
| 839 | PUSHs(ret ? sv_2mortal(ret) : &PL_sv_undef); |
| 840 | XSRETURN(1); |
| 841 | } |
| 842 | |
| 843 | |
| 844 | XS(XS_re_regnames) |
| 845 | { |
| 846 | dVAR; |
| 847 | dXSARGS; |
| 848 | REGEXP * rx; |
| 849 | U32 flags; |
| 850 | SV *ret; |
| 851 | AV *av; |
| 852 | SSize_t length; |
| 853 | SSize_t i; |
| 854 | SV **entry; |
| 855 | |
| 856 | if (items > 1) |
| 857 | croak_xs_usage(cv, "[all]"); |
| 858 | |
| 859 | rx = PL_curpm ? PM_GETRE(PL_curpm) : NULL; |
| 860 | |
| 861 | if (!rx) |
| 862 | XSRETURN_UNDEF; |
| 863 | |
| 864 | if (items == 1 && SvTRUE(ST(0))) { |
| 865 | flags = RXapif_ALL; |
| 866 | } else { |
| 867 | flags = RXapif_ONE; |
| 868 | } |
| 869 | |
| 870 | SP -= items; |
| 871 | PUTBACK; |
| 872 | |
| 873 | ret = CALLREG_NAMED_BUFF_ALL(rx, (flags | RXapif_REGNAMES)); |
| 874 | |
| 875 | SPAGAIN; |
| 876 | |
| 877 | if (!ret) |
| 878 | XSRETURN_UNDEF; |
| 879 | |
| 880 | av = MUTABLE_AV(SvRV(ret)); |
| 881 | length = av_len(av); |
| 882 | |
| 883 | EXTEND(SP, length+1); /* better extend stack just once */ |
| 884 | for (i = 0; i <= length; i++) { |
| 885 | entry = av_fetch(av, i, FALSE); |
| 886 | |
| 887 | if (!entry) |
| 888 | Perl_croak(aTHX_ "NULL array element in re::regnames()"); |
| 889 | |
| 890 | mPUSHs(SvREFCNT_inc_simple_NN(*entry)); |
| 891 | } |
| 892 | |
| 893 | SvREFCNT_dec(ret); |
| 894 | |
| 895 | PUTBACK; |
| 896 | return; |
| 897 | } |
| 898 | |
| 899 | XS(XS_re_regexp_pattern) |
| 900 | { |
| 901 | dVAR; |
| 902 | dXSARGS; |
| 903 | REGEXP *re; |
| 904 | |
| 905 | EXTEND(SP, 2); |
| 906 | SP -= items; |
| 907 | if (items != 1) |
| 908 | croak_xs_usage(cv, "sv"); |
| 909 | |
| 910 | /* |
| 911 | Checks if a reference is a regex or not. If the parameter is |
| 912 | not a ref, or is not the result of a qr// then returns false |
| 913 | in scalar context and an empty list in list context. |
| 914 | Otherwise in list context it returns the pattern and the |
| 915 | modifiers, in scalar context it returns the pattern just as it |
| 916 | would if the qr// was stringified normally, regardless as |
| 917 | to the class of the variable and any stringification overloads |
| 918 | on the object. |
| 919 | */ |
| 920 | |
| 921 | if ((re = SvRX(ST(0)))) /* assign deliberate */ |
| 922 | { |
| 923 | /* Houston, we have a regex! */ |
| 924 | SV *pattern; |
| 925 | |
| 926 | if ( GIMME_V == G_ARRAY ) { |
| 927 | STRLEN left = 0; |
| 928 | char reflags[sizeof(INT_PAT_MODS) + MAX_CHARSET_NAME_LENGTH]; |
| 929 | const char *fptr; |
| 930 | char ch; |
| 931 | U16 match_flags; |
| 932 | |
| 933 | /* |
| 934 | we are in list context so stringify |
| 935 | the modifiers that apply. We ignore "negative |
| 936 | modifiers" in this scenario, and the default character set |
| 937 | */ |
| 938 | |
| 939 | if (get_regex_charset(RX_EXTFLAGS(re)) != REGEX_DEPENDS_CHARSET) { |
| 940 | STRLEN len; |
| 941 | const char* const name = get_regex_charset_name(RX_EXTFLAGS(re), |
| 942 | &len); |
| 943 | Copy(name, reflags + left, len, char); |
| 944 | left += len; |
| 945 | } |
| 946 | fptr = INT_PAT_MODS; |
| 947 | match_flags = (U16)((RX_EXTFLAGS(re) & RXf_PMf_COMPILETIME) |
| 948 | >> RXf_PMf_STD_PMMOD_SHIFT); |
| 949 | |
| 950 | while((ch = *fptr++)) { |
| 951 | if(match_flags & 1) { |
| 952 | reflags[left++] = ch; |
| 953 | } |
| 954 | match_flags >>= 1; |
| 955 | } |
| 956 | |
| 957 | pattern = newSVpvn_flags(RX_PRECOMP(re),RX_PRELEN(re), |
| 958 | (RX_UTF8(re) ? SVf_UTF8 : 0) | SVs_TEMP); |
| 959 | |
| 960 | /* return the pattern and the modifiers */ |
| 961 | PUSHs(pattern); |
| 962 | PUSHs(newSVpvn_flags(reflags, left, SVs_TEMP)); |
| 963 | XSRETURN(2); |
| 964 | } else { |
| 965 | /* Scalar, so use the string that Perl would return */ |
| 966 | /* return the pattern in (?msix:..) format */ |
| 967 | #if PERL_VERSION >= 11 |
| 968 | pattern = sv_2mortal(newSVsv(MUTABLE_SV(re))); |
| 969 | #else |
| 970 | pattern = newSVpvn_flags(RX_WRAPPED(re), RX_WRAPLEN(re), |
| 971 | (RX_UTF8(re) ? SVf_UTF8 : 0) | SVs_TEMP); |
| 972 | #endif |
| 973 | PUSHs(pattern); |
| 974 | XSRETURN(1); |
| 975 | } |
| 976 | } else { |
| 977 | /* It ain't a regexp folks */ |
| 978 | if ( GIMME_V == G_ARRAY ) { |
| 979 | /* return the empty list */ |
| 980 | XSRETURN_UNDEF; |
| 981 | } else { |
| 982 | /* Because of the (?:..) wrapping involved in a |
| 983 | stringified pattern it is impossible to get a |
| 984 | result for a real regexp that would evaluate to |
| 985 | false. Therefore we can return PL_sv_no to signify |
| 986 | that the object is not a regex, this means that one |
| 987 | can say |
| 988 | |
| 989 | if (regex($might_be_a_regex) eq '(?:foo)') { } |
| 990 | |
| 991 | and not worry about undefined values. |
| 992 | */ |
| 993 | XSRETURN_NO; |
| 994 | } |
| 995 | } |
| 996 | /* NOT-REACHED */ |
| 997 | } |
| 998 | |
| 999 | #include "vutil.h" |
| 1000 | #include "vxs.inc" |
| 1001 | |
| 1002 | struct xsub_details { |
| 1003 | const char *name; |
| 1004 | XSUBADDR_t xsub; |
| 1005 | const char *proto; |
| 1006 | }; |
| 1007 | |
| 1008 | static const struct xsub_details details[] = { |
| 1009 | {"UNIVERSAL::isa", XS_UNIVERSAL_isa, NULL}, |
| 1010 | {"UNIVERSAL::can", XS_UNIVERSAL_can, NULL}, |
| 1011 | {"UNIVERSAL::DOES", XS_UNIVERSAL_DOES, NULL}, |
| 1012 | #define VXS_XSUB_DETAILS |
| 1013 | #include "vxs.inc" |
| 1014 | #undef VXS_XSUB_DETAILS |
| 1015 | {"utf8::is_utf8", XS_utf8_is_utf8, NULL}, |
| 1016 | {"utf8::valid", XS_utf8_valid, NULL}, |
| 1017 | {"utf8::encode", XS_utf8_encode, NULL}, |
| 1018 | {"utf8::decode", XS_utf8_decode, NULL}, |
| 1019 | {"utf8::upgrade", XS_utf8_upgrade, NULL}, |
| 1020 | {"utf8::downgrade", XS_utf8_downgrade, NULL}, |
| 1021 | {"utf8::native_to_unicode", XS_utf8_native_to_unicode, NULL}, |
| 1022 | {"utf8::unicode_to_native", XS_utf8_unicode_to_native, NULL}, |
| 1023 | {"Internals::SvREADONLY", XS_Internals_SvREADONLY, "\\[$%@];$"}, |
| 1024 | {"constant::_make_const", XS_constant__make_const, "\\[$@]"}, |
| 1025 | {"Internals::SvREFCNT", XS_Internals_SvREFCNT, "\\[$%@];$"}, |
| 1026 | {"Internals::hv_clear_placeholders", XS_Internals_hv_clear_placehold, "\\%"}, |
| 1027 | {"PerlIO::get_layers", XS_PerlIO_get_layers, "*;@"}, |
| 1028 | {"re::is_regexp", XS_re_is_regexp, "$"}, |
| 1029 | {"re::regname", XS_re_regname, ";$$"}, |
| 1030 | {"re::regnames", XS_re_regnames, ";$"}, |
| 1031 | {"re::regnames_count", XS_re_regnames_count, ""}, |
| 1032 | {"re::regexp_pattern", XS_re_regexp_pattern, "$"}, |
| 1033 | }; |
| 1034 | |
| 1035 | void |
| 1036 | Perl_boot_core_UNIVERSAL(pTHX) |
| 1037 | { |
| 1038 | dVAR; |
| 1039 | static const char file[] = __FILE__; |
| 1040 | const struct xsub_details *xsub = details; |
| 1041 | const struct xsub_details *end |
| 1042 | = details + sizeof(details) / sizeof(details[0]); |
| 1043 | |
| 1044 | do { |
| 1045 | newXS_flags(xsub->name, xsub->xsub, file, xsub->proto, 0); |
| 1046 | } while (++xsub < end); |
| 1047 | |
| 1048 | /* Providing a Regexp::DESTROY fixes #21347. See test in t/op/ref.t */ |
| 1049 | { |
| 1050 | CV * const cv = |
| 1051 | newCONSTSUB(get_hv("Regexp::", GV_ADD), "DESTROY", NULL); |
| 1052 | Safefree(CvFILE(cv)); |
| 1053 | CvFILE(cv) = (char *)file; |
| 1054 | CvDYNFILE_off(cv); |
| 1055 | } |
| 1056 | } |
| 1057 | |
| 1058 | /* |
| 1059 | * Local variables: |
| 1060 | * c-indentation-style: bsd |
| 1061 | * c-basic-offset: 4 |
| 1062 | * indent-tabs-mode: nil |
| 1063 | * End: |
| 1064 | * |
| 1065 | * ex: set ts=8 sts=4 sw=4 et: |
| 1066 | */ |