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,
44 /* A stash/class can go by many names (ie. User == main::User), so
45 we compare the stash itself just in case */
46 if (name_stash && (stash == name_stash))
49 if (strEQ(HvNAME(stash), name))
52 if (strEQ(name, "UNIVERSAL"))
56 Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
59 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
61 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv))
64 if (SvIV(subgen) == (IV)PL_sub_generation) {
66 SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
67 if (svp && (sv = *svp) != (SV*)&PL_sv_undef) {
68 DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
69 name, HvNAME(stash)) );
74 DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n",
77 sv_setiv(subgen, PL_sub_generation);
81 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
83 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
85 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
89 if (SvTYPE(gv) != SVt_PVGV)
90 gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
95 subgen = newSViv(PL_sub_generation);
100 SV** svp = AvARRAY(av);
101 /* NOTE: No support for tied ISA */
102 I32 items = AvFILLp(av) + 1;
105 HV* basestash = gv_stashsv(sv, FALSE);
107 if (ckWARN(WARN_MISC))
108 Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
109 "Can't locate package %"SVf" for @%s::ISA",
113 if (&PL_sv_yes == isa_lookup(basestash, name, name_stash,
115 (void)hv_store(hv,name,len,&PL_sv_yes,0);
119 (void)hv_store(hv,name,len,&PL_sv_no,0);
126 =head1 SV Manipulation Functions
128 =for apidoc sv_derived_from
130 Returns a boolean indicating whether the SV is derived from the specified
131 class. This is the function that implements C<UNIVERSAL::isa>. It works
132 for class names as well as for objects.
138 Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
152 type = sv_reftype(sv,0);
157 stash = gv_stashsv(sv, FALSE);
160 name_stash = gv_stashpv(name, FALSE);
162 return (type && strEQ(type,name)) ||
163 (stash && isa_lookup(stash, name, name_stash, strlen(name), 0)
171 void XS_UNIVERSAL_isa(pTHX_ CV *cv);
172 void XS_UNIVERSAL_can(pTHX_ CV *cv);
173 void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
179 XS(XS_utf8_downgrade);
180 XS(XS_utf8_unicode_to_native);
181 XS(XS_utf8_native_to_unicode);
182 XS(XS_Internals_SvREADONLY);
183 XS(XS_Internals_SvREFCNT);
184 XS(XS_Internals_hv_clear_placehold);
185 XS(XS_PerlIO_get_layers);
186 XS(XS_Regexp_DESTROY);
187 XS(XS_Internals_hash_seed);
188 XS(XS_Internals_rehash_seed);
189 XS(XS_Internals_HvREHASH);
192 Perl_boot_core_UNIVERSAL(pTHX)
194 const char file[] = __FILE__;
196 newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
197 newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
198 newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
199 newXS("utf8::is_utf8", XS_utf8_is_utf8, file);
200 newXS("utf8::valid", XS_utf8_valid, file);
201 newXS("utf8::encode", XS_utf8_encode, file);
202 newXS("utf8::decode", XS_utf8_decode, file);
203 newXS("utf8::upgrade", XS_utf8_upgrade, file);
204 newXS("utf8::downgrade", XS_utf8_downgrade, file);
205 newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
206 newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
207 newXSproto("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$");
208 newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, file, "\\[$%@];$");
209 newXSproto("Internals::hv_clear_placeholders",
210 XS_Internals_hv_clear_placehold, file, "\\%");
211 newXSproto("PerlIO::get_layers",
212 XS_PerlIO_get_layers, file, "*;@");
213 newXS("Regexp::DESTROY", XS_Regexp_DESTROY, file);
214 newXSproto("Internals::hash_seed",XS_Internals_hash_seed, file, "");
215 newXSproto("Internals::rehash_seed",XS_Internals_rehash_seed, file, "");
216 newXSproto("Internals::HvREHASH", XS_Internals_HvREHASH, file, "\\%");
228 Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
235 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
236 || (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
239 name = (const char *)SvPV(ST(1),n_a);
241 ST(0) = boolSV(sv_derived_from(sv, name));
255 Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
262 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
263 || (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
266 name = (const char *)SvPV(ST(1),n_a);
275 pkg = gv_stashsv(sv, FALSE);
279 GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
281 rv = sv_2mortal(newRV((SV*)GvCV(gv)));
288 XS(XS_UNIVERSAL_VERSION)
298 sv = (SV*)SvRV(ST(0));
300 Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
304 pkg = gv_stashsv(ST(0), FALSE);
307 gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
309 if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
310 SV *nsv = sv_newmortal();
316 sv = (SV*)&PL_sv_undef;
327 "%s does not define $%s::VERSION--version check failed",
328 HvNAME(pkg), HvNAME(pkg));
330 const char *str = SvPVx(ST(0), len);
333 "%s defines neither package nor VERSION--version check failed", str);
336 if (!SvNIOK(sv) && SvPOK(sv)) {
337 char *str = SvPVx(sv,len);
340 /* XXX could DWIM "1.2.3" here */
341 if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
345 if (SvNOK(req) && SvPOK(req)) {
346 /* they said C<use Foo v1.2.3> and $Foo::VERSION
347 * doesn't look like a float: do string compare */
348 if (sv_cmp(req,sv) == 1) {
349 Perl_croak(aTHX_ "%s v%"VDf" required--"
350 "this is only v%"VDf,
351 HvNAME(pkg), req, sv);
355 /* they said C<use Foo 1.002_003> and $Foo::VERSION
356 * doesn't look like a float: force numeric compare */
357 (void)SvUPGRADE(sv, SVt_PVNV);
358 SvNVX(sv) = str_to_version(sv);
363 /* if we get here, we're looking for a numeric comparison,
364 * so force the required version into a float, even if they
365 * said C<use Foo v1.2.3> */
366 if (SvNOK(req) && SvPOK(req)) {
368 req = sv_newmortal();
372 if (SvNV(req) > SvNV(sv))
373 Perl_croak(aTHX_ "%s version %s required--this is only version %s",
374 HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv));
387 Perl_croak(aTHX_ "Usage: utf8::is_utf8(sv)");
389 const SV *sv = ST(0);
404 Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
409 const char *s = SvPV(sv,len);
410 if (!SvUTF8(sv) || is_utf8_string((const U8*)s,len))
423 Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
436 Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
439 const bool RETVAL = sv_utf8_decode(sv);
440 ST(0) = boolSV(RETVAL);
450 Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
456 RETVAL = sv_utf8_upgrade(sv);
457 XSprePUSH; PUSHi((IV)RETVAL);
462 XS(XS_utf8_downgrade)
465 if (items < 1 || items > 2)
466 Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
469 const bool failok = (items < 2) ? 0 : (int)SvIV(ST(1));
470 const bool RETVAL = sv_utf8_downgrade(sv, failok);
472 ST(0) = boolSV(RETVAL);
478 XS(XS_utf8_native_to_unicode)
481 const UV uv = SvUV(ST(0));
484 Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");
486 ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
490 XS(XS_utf8_unicode_to_native)
493 const UV uv = SvUV(ST(0));
496 Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");
498 ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
502 XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */
505 SV *sv = SvRV(ST(0));
513 else if (items == 2) {
519 /* I hope you really know what you are doing. */
524 XSRETURN_UNDEF; /* Can't happen. */
527 XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */
530 SV *sv = SvRV(ST(0));
533 XSRETURN_IV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */
534 else if (items == 2) {
535 /* I hope you really know what you are doing. */
536 SvREFCNT(sv) = SvIV(ST(1));
537 XSRETURN_IV(SvREFCNT(sv));
539 XSRETURN_UNDEF; /* Can't happen. */
542 XS(XS_Internals_hv_clear_placehold)
545 HV *hv = (HV *) SvRV(ST(0));
548 Perl_croak(aTHX_ "Usage: UNIVERSAL::hv_clear_placeholders(hv)");
549 hv_clear_placeholders(hv);
553 XS(XS_Regexp_DESTROY)
557 XS(XS_PerlIO_get_layers)
560 if (items < 1 || items % 2 == 0)
561 Perl_croak(aTHX_ "Usage: PerlIO_get_layers(filehandle[,args])");
568 bool details = FALSE;
573 for (svp = MARK + 2; svp <= SP; svp += 2) {
577 const char *key = SvPV(*varp, klen);
581 if (klen == 5 && memEQ(key, "input", 5)) {
582 input = SvTRUE(*valp);
587 if (klen == 6 && memEQ(key, "output", 6)) {
588 input = !SvTRUE(*valp);
593 if (klen == 7 && memEQ(key, "details", 7)) {
594 details = SvTRUE(*valp);
601 "get_layers: unknown argument '%s'",
613 if (SvROK(sv) && isGV(SvRV(sv)))
616 gv = gv_fetchpv(SvPVX(sv), FALSE, SVt_PVIO);
619 if (gv && (io = GvIO(gv))) {
621 AV* av = PerlIO_get_layers(aTHX_ input ?
622 IoIFP(io) : IoOFP(io));
624 I32 last = av_len(av);
627 for (i = last; i >= 0; i -= 3) {
631 bool namok, argok, flgok;
633 namsvp = av_fetch(av, i - 2, FALSE);
634 argsvp = av_fetch(av, i - 1, FALSE);
635 flgsvp = av_fetch(av, i, FALSE);
637 namok = namsvp && *namsvp && SvPOK(*namsvp);
638 argok = argsvp && *argsvp && SvPOK(*argsvp);
639 flgok = flgsvp && *flgsvp && SvIOK(*flgsvp);
643 newSVpv(SvPVX(*namsvp), 0) : &PL_sv_undef);
645 newSVpv(SvPVX(*argsvp), 0) : &PL_sv_undef);
647 XPUSHi(SvIVX(*flgsvp));
649 XPUSHs(&PL_sv_undef);
654 XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf"(%"SVf")",
657 XPUSHs(Perl_newSVpvf(aTHX_ "%"SVf, *namsvp));
659 XPUSHs(&PL_sv_undef);
662 IV flags = SvIVX(*flgsvp);
664 if (flags & PERLIO_F_UTF8) {
665 XPUSHs(newSVpvn("utf8", 4));
682 XS(XS_Internals_hash_seed)
684 /* Using dXSARGS would also have dITEM and dSP,
685 * which define 2 unused local variables. */
687 XSRETURN_UV(PERL_HASH_SEED);
690 XS(XS_Internals_rehash_seed)
692 /* Using dXSARGS would also have dITEM and dSP,
693 * which define 2 unused local variables. */
695 XSRETURN_UV(PL_rehash_seed);
698 XS(XS_Internals_HvREHASH) /* Subject to change */
702 const HV *hv = (HV *) SvRV(ST(0));
703 if (items == 1 && SvTYPE(hv) == SVt_PVHV) {
710 Perl_croak(aTHX_ "Internals::HvREHASH $hashref");
715 * c-indentation-style: bsd
717 * indent-tabs-mode: t