3 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 * 2005, by Larry Wall and others
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.
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 story
17 /* This file contains the code that implements the functions in Perl's
18 * UNIVERSAL package, such as UNIVERSAL->can().
22 #define PERL_IN_UNIVERSAL_C
26 #include "perliol.h" /* For the PERLIO_F_XXX */
30 * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
31 * The main guts of traverse_isa was actually copied from gv_fetchmeth
35 S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash,
45 /* A stash/class can go by many names (ie. User == main::User), so
46 we compare the stash itself just in case */
47 if (name_stash && (stash == name_stash))
50 hvname = HvNAME_get(stash);
52 if (strEQ(hvname, name))
55 if (strEQ(name, "UNIVERSAL"))
59 Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
62 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
64 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv))
67 if (SvIV(subgen) == (IV)PL_sub_generation) {
69 SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
70 if (svp && (sv = *svp) != (SV*)&PL_sv_undef) {
71 DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
77 DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n",
80 sv_setiv(subgen, PL_sub_generation);
84 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
86 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
88 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
92 if (SvTYPE(gv) != SVt_PVGV)
93 gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
98 subgen = newSViv(PL_sub_generation);
103 SV** svp = AvARRAY(av);
104 /* NOTE: No support for tied ISA */
105 I32 items = AvFILLp(av) + 1;
108 HV* basestash = gv_stashsv(sv, FALSE);
110 if (ckWARN(WARN_MISC))
111 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
112 "Can't locate package %"SVf" for @%s::ISA",
116 if (&PL_sv_yes == isa_lookup(basestash, name, name_stash,
118 (void)hv_store(hv,name,len,&PL_sv_yes,0);
122 (void)hv_store(hv,name,len,&PL_sv_no,0);
129 =head1 SV Manipulation Functions
131 =for apidoc sv_derived_from
133 Returns a boolean indicating whether the SV is derived from the specified
134 class. This is the function that implements C<UNIVERSAL::isa>. It works
135 for class names as well as for objects.
141 Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
155 type = sv_reftype(sv,0);
160 stash = gv_stashsv(sv, FALSE);
163 name_stash = gv_stashpv(name, FALSE);
165 return (type && strEQ(type,name)) ||
166 (stash && isa_lookup(stash, name, name_stash, strlen(name), 0)
174 void XS_UNIVERSAL_isa(pTHX_ CV *cv);
175 void XS_UNIVERSAL_can(pTHX_ CV *cv);
176 void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
182 XS(XS_utf8_downgrade);
183 XS(XS_utf8_unicode_to_native);
184 XS(XS_utf8_native_to_unicode);
185 XS(XS_Internals_SvREADONLY);
186 XS(XS_Internals_SvREFCNT);
187 XS(XS_Internals_hv_clear_placehold);
188 XS(XS_PerlIO_get_layers);
189 XS(XS_Regexp_DESTROY);
190 XS(XS_Internals_hash_seed);
191 XS(XS_Internals_rehash_seed);
192 XS(XS_Internals_HvREHASH);
195 Perl_boot_core_UNIVERSAL(pTHX)
197 const char file[] = __FILE__;
199 newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
200 newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
201 newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
202 newXS("utf8::is_utf8", XS_utf8_is_utf8, file);
203 newXS("utf8::valid", XS_utf8_valid, file);
204 newXS("utf8::encode", XS_utf8_encode, file);
205 newXS("utf8::decode", XS_utf8_decode, file);
206 newXS("utf8::upgrade", XS_utf8_upgrade, file);
207 newXS("utf8::downgrade", XS_utf8_downgrade, file);
208 newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
209 newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
210 newXSproto("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$");
211 newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, file, "\\[$%@];$");
212 newXSproto("Internals::hv_clear_placeholders",
213 XS_Internals_hv_clear_placehold, file, "\\%");
214 newXSproto("PerlIO::get_layers",
215 XS_PerlIO_get_layers, file, "*;@");
216 newXS("Regexp::DESTROY", XS_Regexp_DESTROY, file);
217 newXSproto("Internals::hash_seed",XS_Internals_hash_seed, file, "");
218 newXSproto("Internals::rehash_seed",XS_Internals_rehash_seed, file, "");
219 newXSproto("Internals::HvREHASH", XS_Internals_HvREHASH, file, "\\%");
231 Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
238 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
239 || (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
242 name = (const char *)SvPV(ST(1),n_a);
244 ST(0) = boolSV(sv_derived_from(sv, name));
258 Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
265 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
266 || (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
269 name = (const char *)SvPV(ST(1),n_a);
278 pkg = gv_stashsv(sv, FALSE);
282 GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
284 rv = sv_2mortal(newRV((SV*)GvCV(gv)));
291 XS(XS_UNIVERSAL_VERSION)
301 sv = (SV*)SvRV(ST(0));
303 Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
307 pkg = gv_stashsv(ST(0), FALSE);
310 gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
312 if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
313 SV *nsv = sv_newmortal();
319 sv = (SV*)&PL_sv_undef;
329 const char *name = HvNAME_get(pkg);
331 "%s does not define $%s::VERSION--version check failed",
334 const char *str = SvPVx(ST(0), len);
337 "%s defines neither package nor VERSION--version check failed", str);
340 if (!SvNIOK(sv) && SvPOK(sv)) {
341 char *str = SvPVx(sv,len);
344 /* XXX could DWIM "1.2.3" here */
345 if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
349 if (SvNOK(req) && SvPOK(req)) {
350 /* they said C<use Foo v1.2.3> and $Foo::VERSION
351 * doesn't look like a float: do string compare */
352 if (sv_cmp(req,sv) == 1) {
353 Perl_croak(aTHX_ "%s v%"VDf" required--"
354 "this is only v%"VDf,
355 HvNAME(pkg), req, sv);
359 /* they said C<use Foo 1.002_003> and $Foo::VERSION
360 * doesn't look like a float: force numeric compare */
361 (void)SvUPGRADE(sv, SVt_PVNV);
362 SvNVX(sv) = str_to_version(sv);
367 /* if we get here, we're looking for a numeric comparison,
368 * so force the required version into a float, even if they
369 * said C<use Foo v1.2.3> */
370 if (SvNOK(req) && SvPOK(req)) {
372 req = sv_newmortal();
376 if (SvNV(req) > SvNV(sv))
377 Perl_croak(aTHX_ "%s version %s required--this is only version %s",
378 HvNAME_get(pkg), SvPV_nolen(req), SvPV_nolen(sv));
391 Perl_croak(aTHX_ "Usage: utf8::is_utf8(sv)");
393 const SV *sv = ST(0);
408 Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
413 const char *s = SvPV(sv,len);
414 if (!SvUTF8(sv) || is_utf8_string((const U8*)s,len))
427 Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
440 Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
443 const bool RETVAL = sv_utf8_decode(sv);
444 ST(0) = boolSV(RETVAL);
454 Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
460 RETVAL = sv_utf8_upgrade(sv);
461 XSprePUSH; PUSHi((IV)RETVAL);
466 XS(XS_utf8_downgrade)
469 if (items < 1 || items > 2)
470 Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
473 const bool failok = (items < 2) ? 0 : (int)SvIV(ST(1));
474 const bool RETVAL = sv_utf8_downgrade(sv, failok);
476 ST(0) = boolSV(RETVAL);
482 XS(XS_utf8_native_to_unicode)
485 const UV uv = SvUV(ST(0));
488 Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");
490 ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
494 XS(XS_utf8_unicode_to_native)
497 const UV uv = SvUV(ST(0));
500 Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");
502 ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
506 XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */
509 SV *sv = SvRV(ST(0));
517 else if (items == 2) {
523 /* I hope you really know what you are doing. */
528 XSRETURN_UNDEF; /* Can't happen. */
531 XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */
534 SV *sv = SvRV(ST(0));
537 XSRETURN_IV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */
538 else if (items == 2) {
539 /* I hope you really know what you are doing. */
540 SvREFCNT(sv) = SvIV(ST(1));
541 XSRETURN_IV(SvREFCNT(sv));
543 XSRETURN_UNDEF; /* Can't happen. */
546 XS(XS_Internals_hv_clear_placehold)
549 HV *hv = (HV *) SvRV(ST(0));
552 Perl_croak(aTHX_ "Usage: UNIVERSAL::hv_clear_placeholders(hv)");
553 hv_clear_placeholders(hv);
557 XS(XS_Regexp_DESTROY)
561 XS(XS_PerlIO_get_layers)
564 if (items < 1 || items % 2 == 0)
565 Perl_croak(aTHX_ "Usage: PerlIO_get_layers(filehandle[,args])");
572 bool details = FALSE;
577 for (svp = MARK + 2; svp <= SP; svp += 2) {
581 const char *key = SvPV(*varp, klen);
585 if (klen == 5 && memEQ(key, "input", 5)) {
586 input = SvTRUE(*valp);
591 if (klen == 6 && memEQ(key, "output", 6)) {
592 input = !SvTRUE(*valp);
597 if (klen == 7 && memEQ(key, "details", 7)) {
598 details = SvTRUE(*valp);
605 "get_layers: unknown argument '%s'",
617 if (SvROK(sv) && isGV(SvRV(sv)))
620 gv = gv_fetchpv(SvPVX(sv), FALSE, SVt_PVIO);
623 if (gv && (io = GvIO(gv))) {
625 AV* av = PerlIO_get_layers(aTHX_ input ?
626 IoIFP(io) : IoOFP(io));
628 I32 last = av_len(av);
631 for (i = last; i >= 0; i -= 3) {
635 bool namok, argok, flgok;
637 namsvp = av_fetch(av, i - 2, FALSE);
638 argsvp = av_fetch(av, i - 1, FALSE);
639 flgsvp = av_fetch(av, i, FALSE);
641 namok = namsvp && *namsvp && SvPOK(*namsvp);
642 argok = argsvp && *argsvp && SvPOK(*argsvp);
643 flgok = flgsvp && *flgsvp && SvIOK(*flgsvp);
647 newSVpv(SvPVX_const(*namsvp), 0) : &PL_sv_undef);
649 newSVpv(SvPVX_const(*argsvp), 0) : &PL_sv_undef);
651 XPUSHi(SvIVX(*flgsvp));
653 XPUSHs(&PL_sv_undef);
658 XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf"(%"SVf")",
661 XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf, *namsvp));
663 XPUSHs(&PL_sv_undef);
666 IV flags = SvIVX(*flgsvp);
668 if (flags & PERLIO_F_UTF8) {
669 XPUSHs(newSVpvn("utf8", 4));
686 XS(XS_Internals_hash_seed)
688 /* Using dXSARGS would also have dITEM and dSP,
689 * which define 2 unused local variables. */
691 XSRETURN_UV(PERL_HASH_SEED);
694 XS(XS_Internals_rehash_seed)
696 /* Using dXSARGS would also have dITEM and dSP,
697 * which define 2 unused local variables. */
699 XSRETURN_UV(PL_rehash_seed);
702 XS(XS_Internals_HvREHASH) /* Subject to change */
706 const HV *hv = (HV *) SvRV(ST(0));
707 if (items == 1 && SvTYPE(hv) == SVt_PVHV) {
714 Perl_croak(aTHX_ "Internals::HvREHASH $hashref");
719 * c-indentation-style: bsd
721 * indent-tabs-mode: t
724 * ex: set ts=8 sts=4 sw=4 noet: