| 1 | #include "EXTERN.h" |
| 2 | #define PERL_IN_UNIVERSAL_C |
| 3 | #include "perl.h" |
| 4 | |
| 5 | /* |
| 6 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> |
| 7 | * The main guts of traverse_isa was actually copied from gv_fetchmeth |
| 8 | */ |
| 9 | |
| 10 | STATIC SV * |
| 11 | S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level) |
| 12 | { |
| 13 | AV* av; |
| 14 | GV* gv; |
| 15 | GV** gvp; |
| 16 | HV* hv = Nullhv; |
| 17 | SV* subgen = Nullsv; |
| 18 | |
| 19 | if (!stash) |
| 20 | return &PL_sv_undef; |
| 21 | |
| 22 | if (strEQ(HvNAME(stash), name)) |
| 23 | return &PL_sv_yes; |
| 24 | |
| 25 | if (level > 100) |
| 26 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
| 27 | HvNAME(stash)); |
| 28 | |
| 29 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); |
| 30 | |
| 31 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv)) |
| 32 | && (hv = GvHV(gv))) |
| 33 | { |
| 34 | if (SvIV(subgen) == PL_sub_generation) { |
| 35 | SV* sv; |
| 36 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); |
| 37 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) { |
| 38 | DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n", |
| 39 | name, HvNAME(stash)) ); |
| 40 | return sv; |
| 41 | } |
| 42 | } |
| 43 | else { |
| 44 | DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n", |
| 45 | HvNAME(stash)) ); |
| 46 | hv_clear(hv); |
| 47 | sv_setiv(subgen, PL_sub_generation); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); |
| 52 | |
| 53 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
| 54 | if (!hv || !subgen) { |
| 55 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
| 56 | |
| 57 | gv = *gvp; |
| 58 | |
| 59 | if (SvTYPE(gv) != SVt_PVGV) |
| 60 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); |
| 61 | |
| 62 | if (!hv) |
| 63 | hv = GvHVn(gv); |
| 64 | if (!subgen) { |
| 65 | subgen = newSViv(PL_sub_generation); |
| 66 | GvSV(gv) = subgen; |
| 67 | } |
| 68 | } |
| 69 | if (hv) { |
| 70 | SV** svp = AvARRAY(av); |
| 71 | /* NOTE: No support for tied ISA */ |
| 72 | I32 items = AvFILLp(av) + 1; |
| 73 | while (items--) { |
| 74 | SV* sv = *svp++; |
| 75 | HV* basestash = gv_stashsv(sv, FALSE); |
| 76 | if (!basestash) { |
| 77 | if (ckWARN(WARN_MISC)) |
| 78 | Perl_warner(aTHX_ WARN_SYNTAX, |
| 79 | "Can't locate package %s for @%s::ISA", |
| 80 | SvPVX(sv), HvNAME(stash)); |
| 81 | continue; |
| 82 | } |
| 83 | if (&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) { |
| 84 | (void)hv_store(hv,name,len,&PL_sv_yes,0); |
| 85 | return &PL_sv_yes; |
| 86 | } |
| 87 | } |
| 88 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | return boolSV(strEQ(name, "UNIVERSAL")); |
| 93 | } |
| 94 | |
| 95 | /* |
| 96 | =for apidoc sv_derived_from |
| 97 | |
| 98 | Returns a boolean indicating whether the SV is derived from the specified |
| 99 | class. This is the function that implements C<UNIVERSAL::isa>. It works |
| 100 | for class names as well as for objects. |
| 101 | |
| 102 | =cut |
| 103 | */ |
| 104 | |
| 105 | bool |
| 106 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
| 107 | { |
| 108 | char *type; |
| 109 | HV *stash; |
| 110 | |
| 111 | stash = Nullhv; |
| 112 | type = Nullch; |
| 113 | |
| 114 | if (SvGMAGICAL(sv)) |
| 115 | mg_get(sv) ; |
| 116 | |
| 117 | if (SvROK(sv)) { |
| 118 | sv = SvRV(sv); |
| 119 | type = sv_reftype(sv,0); |
| 120 | if (SvOBJECT(sv)) |
| 121 | stash = SvSTASH(sv); |
| 122 | } |
| 123 | else { |
| 124 | stash = gv_stashsv(sv, FALSE); |
| 125 | } |
| 126 | |
| 127 | return (type && strEQ(type,name)) || |
| 128 | (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes) |
| 129 | ? TRUE |
| 130 | : FALSE ; |
| 131 | } |
| 132 | |
| 133 | #include "XSUB.h" |
| 134 | |
| 135 | void XS_UNIVERSAL_isa(pTHX_ CV *cv); |
| 136 | void XS_UNIVERSAL_can(pTHX_ CV *cv); |
| 137 | void XS_UNIVERSAL_VERSION(pTHX_ CV *cv); |
| 138 | XS(XS_utf8_valid); |
| 139 | XS(XS_utf8_encode); |
| 140 | XS(XS_utf8_decode); |
| 141 | XS(XS_utf8_upgrade); |
| 142 | XS(XS_utf8_downgrade); |
| 143 | XS(XS_utf8_unicode_to_native); |
| 144 | XS(XS_utf8_native_to_unicode); |
| 145 | XS(XS_access_readonly); |
| 146 | |
| 147 | void |
| 148 | Perl_boot_core_UNIVERSAL(pTHX) |
| 149 | { |
| 150 | char *file = __FILE__; |
| 151 | |
| 152 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
| 153 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
| 154 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
| 155 | newXS("utf8::valid", XS_utf8_valid, file); |
| 156 | newXS("utf8::encode", XS_utf8_encode, file); |
| 157 | newXS("utf8::decode", XS_utf8_decode, file); |
| 158 | newXS("utf8::upgrade", XS_utf8_upgrade, file); |
| 159 | newXS("utf8::downgrade", XS_utf8_downgrade, file); |
| 160 | newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file); |
| 161 | newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file); |
| 162 | newXSproto("access::readonly",XS_access_readonly, file, "\\[$%@];$"); |
| 163 | } |
| 164 | |
| 165 | |
| 166 | XS(XS_UNIVERSAL_isa) |
| 167 | { |
| 168 | dXSARGS; |
| 169 | SV *sv; |
| 170 | char *name; |
| 171 | STRLEN n_a; |
| 172 | |
| 173 | if (items != 2) |
| 174 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
| 175 | |
| 176 | sv = ST(0); |
| 177 | |
| 178 | if (SvGMAGICAL(sv)) |
| 179 | mg_get(sv); |
| 180 | |
| 181 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
| 182 | XSRETURN_UNDEF; |
| 183 | |
| 184 | name = (char *)SvPV(ST(1),n_a); |
| 185 | |
| 186 | ST(0) = boolSV(sv_derived_from(sv, name)); |
| 187 | XSRETURN(1); |
| 188 | } |
| 189 | |
| 190 | XS(XS_UNIVERSAL_can) |
| 191 | { |
| 192 | dXSARGS; |
| 193 | SV *sv; |
| 194 | char *name; |
| 195 | SV *rv; |
| 196 | HV *pkg = NULL; |
| 197 | STRLEN n_a; |
| 198 | |
| 199 | if (items != 2) |
| 200 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
| 201 | |
| 202 | sv = ST(0); |
| 203 | |
| 204 | if (SvGMAGICAL(sv)) |
| 205 | mg_get(sv); |
| 206 | |
| 207 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
| 208 | XSRETURN_UNDEF; |
| 209 | |
| 210 | name = (char *)SvPV(ST(1),n_a); |
| 211 | rv = &PL_sv_undef; |
| 212 | |
| 213 | if (SvROK(sv)) { |
| 214 | sv = (SV*)SvRV(sv); |
| 215 | if (SvOBJECT(sv)) |
| 216 | pkg = SvSTASH(sv); |
| 217 | } |
| 218 | else { |
| 219 | pkg = gv_stashsv(sv, FALSE); |
| 220 | } |
| 221 | |
| 222 | if (pkg) { |
| 223 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
| 224 | if (gv && isGV(gv)) |
| 225 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); |
| 226 | } |
| 227 | |
| 228 | ST(0) = rv; |
| 229 | XSRETURN(1); |
| 230 | } |
| 231 | |
| 232 | XS(XS_UNIVERSAL_VERSION) |
| 233 | { |
| 234 | dXSARGS; |
| 235 | HV *pkg; |
| 236 | GV **gvp; |
| 237 | GV *gv; |
| 238 | SV *sv; |
| 239 | char *undef; |
| 240 | |
| 241 | if (SvROK(ST(0))) { |
| 242 | sv = (SV*)SvRV(ST(0)); |
| 243 | if (!SvOBJECT(sv)) |
| 244 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
| 245 | pkg = SvSTASH(sv); |
| 246 | } |
| 247 | else { |
| 248 | pkg = gv_stashsv(ST(0), FALSE); |
| 249 | } |
| 250 | |
| 251 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
| 252 | |
| 253 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
| 254 | SV *nsv = sv_newmortal(); |
| 255 | sv_setsv(nsv, sv); |
| 256 | sv = nsv; |
| 257 | undef = Nullch; |
| 258 | } |
| 259 | else { |
| 260 | sv = (SV*)&PL_sv_undef; |
| 261 | undef = "(undef)"; |
| 262 | } |
| 263 | |
| 264 | if (items > 1) { |
| 265 | STRLEN len; |
| 266 | SV *req = ST(1); |
| 267 | |
| 268 | if (undef) |
| 269 | Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed", |
| 270 | HvNAME(pkg), HvNAME(pkg)); |
| 271 | |
| 272 | if (!SvNIOK(sv) && SvPOK(sv)) { |
| 273 | char *str = SvPVx(sv,len); |
| 274 | while (len) { |
| 275 | --len; |
| 276 | /* XXX could DWIM "1.2.3" here */ |
| 277 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') |
| 278 | break; |
| 279 | } |
| 280 | if (len) { |
| 281 | if (SvNOK(req) && SvPOK(req)) { |
| 282 | /* they said C<use Foo v1.2.3> and $Foo::VERSION |
| 283 | * doesn't look like a float: do string compare */ |
| 284 | if (sv_cmp(req,sv) == 1) { |
| 285 | Perl_croak(aTHX_ "%s v%"VDf" required--" |
| 286 | "this is only v%"VDf, |
| 287 | HvNAME(pkg), req, sv); |
| 288 | } |
| 289 | goto finish; |
| 290 | } |
| 291 | /* they said C<use Foo 1.002_003> and $Foo::VERSION |
| 292 | * doesn't look like a float: force numeric compare */ |
| 293 | (void)SvUPGRADE(sv, SVt_PVNV); |
| 294 | SvNVX(sv) = str_to_version(sv); |
| 295 | SvPOK_off(sv); |
| 296 | SvNOK_on(sv); |
| 297 | } |
| 298 | } |
| 299 | /* if we get here, we're looking for a numeric comparison, |
| 300 | * so force the required version into a float, even if they |
| 301 | * said C<use Foo v1.2.3> */ |
| 302 | if (SvNOK(req) && SvPOK(req)) { |
| 303 | NV n = SvNV(req); |
| 304 | req = sv_newmortal(); |
| 305 | sv_setnv(req, n); |
| 306 | } |
| 307 | |
| 308 | if (SvNV(req) > SvNV(sv)) |
| 309 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
| 310 | HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv)); |
| 311 | } |
| 312 | |
| 313 | finish: |
| 314 | ST(0) = sv; |
| 315 | |
| 316 | XSRETURN(1); |
| 317 | } |
| 318 | |
| 319 | XS(XS_utf8_valid) |
| 320 | { |
| 321 | dXSARGS; |
| 322 | if (items != 1) |
| 323 | Perl_croak(aTHX_ "Usage: utf8::valid(sv)"); |
| 324 | { |
| 325 | SV * sv = ST(0); |
| 326 | { |
| 327 | STRLEN len; |
| 328 | char *s = SvPV(sv,len); |
| 329 | if (!SvUTF8(sv) || is_utf8_string((U8*)s,len)) |
| 330 | XSRETURN_YES; |
| 331 | else |
| 332 | XSRETURN_NO; |
| 333 | } |
| 334 | } |
| 335 | XSRETURN_EMPTY; |
| 336 | } |
| 337 | |
| 338 | XS(XS_utf8_encode) |
| 339 | { |
| 340 | dXSARGS; |
| 341 | if (items != 1) |
| 342 | Perl_croak(aTHX_ "Usage: utf8::encode(sv)"); |
| 343 | { |
| 344 | SV * sv = ST(0); |
| 345 | |
| 346 | sv_utf8_encode(sv); |
| 347 | } |
| 348 | XSRETURN_EMPTY; |
| 349 | } |
| 350 | |
| 351 | XS(XS_utf8_decode) |
| 352 | { |
| 353 | dXSARGS; |
| 354 | if (items != 1) |
| 355 | Perl_croak(aTHX_ "Usage: utf8::decode(sv)"); |
| 356 | { |
| 357 | SV * sv = ST(0); |
| 358 | bool RETVAL; |
| 359 | |
| 360 | RETVAL = sv_utf8_decode(sv); |
| 361 | ST(0) = boolSV(RETVAL); |
| 362 | sv_2mortal(ST(0)); |
| 363 | } |
| 364 | XSRETURN(1); |
| 365 | } |
| 366 | |
| 367 | XS(XS_utf8_upgrade) |
| 368 | { |
| 369 | dXSARGS; |
| 370 | if (items != 1) |
| 371 | Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)"); |
| 372 | { |
| 373 | SV * sv = ST(0); |
| 374 | STRLEN RETVAL; |
| 375 | dXSTARG; |
| 376 | |
| 377 | RETVAL = sv_utf8_upgrade(sv); |
| 378 | XSprePUSH; PUSHi((IV)RETVAL); |
| 379 | } |
| 380 | XSRETURN(1); |
| 381 | } |
| 382 | |
| 383 | XS(XS_utf8_downgrade) |
| 384 | { |
| 385 | dXSARGS; |
| 386 | if (items < 1 || items > 2) |
| 387 | Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)"); |
| 388 | { |
| 389 | SV * sv = ST(0); |
| 390 | bool failok; |
| 391 | bool RETVAL; |
| 392 | |
| 393 | if (items < 2) |
| 394 | failok = 0; |
| 395 | else { |
| 396 | failok = (int)SvIV(ST(1)); |
| 397 | } |
| 398 | |
| 399 | RETVAL = sv_utf8_downgrade(sv, failok); |
| 400 | ST(0) = boolSV(RETVAL); |
| 401 | sv_2mortal(ST(0)); |
| 402 | } |
| 403 | XSRETURN(1); |
| 404 | } |
| 405 | |
| 406 | XS(XS_utf8_native_to_unicode) |
| 407 | { |
| 408 | dXSARGS; |
| 409 | UV uv = SvUV(ST(0)); |
| 410 | |
| 411 | if (items > 1) |
| 412 | Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)"); |
| 413 | |
| 414 | ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv))); |
| 415 | XSRETURN(1); |
| 416 | } |
| 417 | |
| 418 | XS(XS_utf8_unicode_to_native) |
| 419 | { |
| 420 | dXSARGS; |
| 421 | UV uv = SvUV(ST(0)); |
| 422 | |
| 423 | if (items > 1) |
| 424 | Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)"); |
| 425 | |
| 426 | ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv))); |
| 427 | XSRETURN(1); |
| 428 | } |
| 429 | |
| 430 | XS(XS_access_readonly) |
| 431 | { |
| 432 | dXSARGS; |
| 433 | SV *sv = SvRV(ST(0)); |
| 434 | IV old = SvREADONLY(sv); |
| 435 | if (items == 2) { |
| 436 | if (SvTRUE(ST(1))) { |
| 437 | SvREADONLY_on(sv); |
| 438 | } |
| 439 | else { |
| 440 | SvREADONLY_off(sv); |
| 441 | } |
| 442 | } |
| 443 | if (old) |
| 444 | XSRETURN_YES; |
| 445 | else |
| 446 | XSRETURN_NO; |
| 447 | } |
| 448 | |