283 lines
6.1 KiB
C
283 lines
6.1 KiB
C
#include "EXTERN.h"
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#define PERL_IN_UNIVERSAL_C
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#include "perl.h"
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/*
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* Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
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* The main guts of traverse_isa was actually copied from gv_fetchmeth
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*/
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STATIC SV *
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S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
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{
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AV* av;
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GV* gv;
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GV** gvp;
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HV* hv = Nullhv;
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if (!stash)
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return &PL_sv_undef;
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if(strEQ(HvNAME(stash), name))
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return &PL_sv_yes;
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if (level > 100)
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Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash));
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gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
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if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) {
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SV* sv;
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SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
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if (svp && (sv = *svp) != (SV*)&PL_sv_undef)
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return sv;
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}
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gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
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if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
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if(!hv) {
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gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
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gv = *gvp;
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if (SvTYPE(gv) != SVt_PVGV)
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gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
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hv = GvHVn(gv);
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}
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if(hv) {
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SV** svp = AvARRAY(av);
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/* NOTE: No support for tied ISA */
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I32 items = AvFILLp(av) + 1;
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while (items--) {
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SV* sv = *svp++;
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HV* basestash = gv_stashsv(sv, FALSE);
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if (!basestash) {
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dTHR;
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if (ckWARN(WARN_MISC))
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Perl_warner(aTHX_ WARN_SYNTAX,
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"Can't locate package %s for @%s::ISA",
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SvPVX(sv), HvNAME(stash));
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continue;
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}
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if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
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(void)hv_store(hv,name,len,&PL_sv_yes,0);
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return &PL_sv_yes;
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}
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}
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(void)hv_store(hv,name,len,&PL_sv_no,0);
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}
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}
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return boolSV(strEQ(name, "UNIVERSAL"));
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}
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/*
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=for apidoc sv_derived_from
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Returns a boolean indicating whether the SV is derived from the specified
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class. This is the function that implements C<UNIVERSAL::isa>. It works
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for class names as well as for objects.
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=cut
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*/
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bool
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Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
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{
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char *type;
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HV *stash;
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stash = Nullhv;
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type = Nullch;
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if (SvGMAGICAL(sv))
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mg_get(sv) ;
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if (SvROK(sv)) {
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sv = SvRV(sv);
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type = sv_reftype(sv,0);
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if(SvOBJECT(sv))
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stash = SvSTASH(sv);
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}
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else {
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stash = gv_stashsv(sv, FALSE);
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}
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return (type && strEQ(type,name)) ||
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(stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes)
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? TRUE
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: FALSE ;
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}
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void XS_UNIVERSAL_isa(pTHXo_ CV *cv);
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void XS_UNIVERSAL_can(pTHXo_ CV *cv);
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void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv);
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void
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Perl_boot_core_UNIVERSAL(pTHX)
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{
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char *file = __FILE__;
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newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
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newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
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newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
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}
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#include "XSUB.h"
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XS(XS_UNIVERSAL_isa)
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{
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dXSARGS;
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SV *sv;
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char *name;
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STRLEN n_a;
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if (items != 2)
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Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
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sv = ST(0);
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if (SvGMAGICAL(sv))
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mg_get(sv);
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if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
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XSRETURN_UNDEF;
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name = (char *)SvPV(ST(1),n_a);
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ST(0) = boolSV(sv_derived_from(sv, name));
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XSRETURN(1);
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}
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XS(XS_UNIVERSAL_can)
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{
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dXSARGS;
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SV *sv;
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char *name;
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SV *rv;
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HV *pkg = NULL;
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STRLEN n_a;
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if (items != 2)
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Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
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sv = ST(0);
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if (SvGMAGICAL(sv))
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mg_get(sv);
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if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
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XSRETURN_UNDEF;
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name = (char *)SvPV(ST(1),n_a);
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rv = &PL_sv_undef;
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if(SvROK(sv)) {
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sv = (SV*)SvRV(sv);
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if(SvOBJECT(sv))
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pkg = SvSTASH(sv);
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}
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else {
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pkg = gv_stashsv(sv, FALSE);
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}
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if (pkg) {
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GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
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if (gv && isGV(gv))
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rv = sv_2mortal(newRV((SV*)GvCV(gv)));
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}
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ST(0) = rv;
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XSRETURN(1);
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}
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XS(XS_UNIVERSAL_VERSION)
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{
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dXSARGS;
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HV *pkg;
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GV **gvp;
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GV *gv;
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SV *sv;
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char *undef;
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if (SvROK(ST(0))) {
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sv = (SV*)SvRV(ST(0));
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if (!SvOBJECT(sv))
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Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
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pkg = SvSTASH(sv);
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}
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else {
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pkg = gv_stashsv(ST(0), FALSE);
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}
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gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
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if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
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SV *nsv = sv_newmortal();
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sv_setsv(nsv, sv);
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sv = nsv;
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undef = Nullch;
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}
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else {
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sv = (SV*)&PL_sv_undef;
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undef = "(undef)";
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}
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if (items > 1) {
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STRLEN len;
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SV *req = ST(1);
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if (undef)
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Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
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HvNAME(pkg), HvNAME(pkg));
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if (!SvNIOK(sv) && SvPOK(sv)) {
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char *str = SvPVx(sv,len);
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while (len) {
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--len;
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/* XXX could DWIM "1.2.3" here */
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if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
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break;
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}
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if (len) {
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if (SvNIOKp(req) && SvPOK(req)) {
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/* they said C<use Foo v1.2.3> and $Foo::VERSION
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* doesn't look like a float: do string compare */
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if (sv_cmp(req,sv) == 1) {
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Perl_croak(aTHX_ "%s v%vd required--"
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"this is only v%vd",
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HvNAME(pkg), req, sv);
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}
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goto finish;
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}
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/* they said C<use Foo 1.002_003> and $Foo::VERSION
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* doesn't look like a float: force numeric compare */
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(void)SvUPGRADE(sv, SVt_PVNV);
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SvNVX(sv) = str_to_version(sv);
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SvPOK_off(sv);
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SvNOK_on(sv);
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}
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}
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/* if we get here, we're looking for a numeric comparison,
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* so force the required version into a float, even if they
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* said C<use Foo v1.2.3> */
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if (SvNIOKp(req) && SvPOK(req)) {
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NV n = SvNV(req);
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req = sv_newmortal();
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sv_setnv(req, n);
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}
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if (SvNV(req) > SvNV(sv))
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Perl_croak(aTHX_ "%s version %s required--this is only version %s",
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HvNAME(pkg), SvPV(req,len), SvPV(sv,len));
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}
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finish:
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ST(0) = sv;
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XSRETURN(1);
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}
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