+/* universal.c
+ *
+ * Copyright (c) 1997-2002, Larry Wall
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Artistic License, as specified in the README file.
+ *
+ */
+
+/*
+ * "The roots of those mountains must be roots indeed; there must be
+ * great secrets buried there which have not been discovered since the
+ * beginning." --Gandalf, relating Gollum's story
+ */
+
#include "EXTERN.h"
#define PERL_IN_UNIVERSAL_C
#include "perl.h"
*/
STATIC SV *
-S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
+S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash,
+ int len, int level)
{
AV* av;
GV* gv;
HV* hv = Nullhv;
SV* subgen = Nullsv;
- if (!stash)
- return &PL_sv_undef;
+ /* A stash/class can go by many names (ie. User == main::User), so
+ we compare the stash itself just in case */
+ if (name_stash && (stash == name_stash))
+ return &PL_sv_yes;
if (strEQ(HvNAME(stash), name))
return &PL_sv_yes;
if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv))
&& (hv = GvHV(gv)))
{
- if (SvIV(subgen) == PL_sub_generation) {
+ if (SvIV(subgen) == (IV)PL_sub_generation) {
SV* sv;
SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
if (svp && (sv = *svp) != (SV*)&PL_sv_undef) {
HV* basestash = gv_stashsv(sv, FALSE);
if (!basestash) {
if (ckWARN(WARN_MISC))
- Perl_warner(aTHX_ WARN_SYNTAX,
+ Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
"Can't locate package %s for @%s::ISA",
SvPVX(sv), HvNAME(stash));
continue;
}
- if (&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
+ if (&PL_sv_yes == isa_lookup(basestash, name, name_stash,
+ len, level + 1)) {
(void)hv_store(hv,name,len,&PL_sv_yes,0);
return &PL_sv_yes;
}
}
/*
+=head1 SV Manipulation Functions
+
=for apidoc sv_derived_from
Returns a boolean indicating whether the SV is derived from the specified
{
char *type;
HV *stash;
+ HV *name_stash;
stash = Nullhv;
type = Nullch;
stash = gv_stashsv(sv, FALSE);
}
+ name_stash = gv_stashpv(name, FALSE);
+
return (type && strEQ(type,name)) ||
- (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes)
+ (stash && isa_lookup(stash, name, name_stash, strlen(name), 0)
+ == &PL_sv_yes)
? TRUE
: FALSE ;
}
#include "XSUB.h"
-void XS_UNIVERSAL_isa(pTHXo_ CV *cv);
-void XS_UNIVERSAL_can(pTHXo_ CV *cv);
-void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv);
+void XS_UNIVERSAL_isa(pTHX_ CV *cv);
+void XS_UNIVERSAL_can(pTHX_ CV *cv);
+void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
XS(XS_utf8_valid);
XS(XS_utf8_encode);
XS(XS_utf8_decode);
XS(XS_utf8_downgrade);
XS(XS_utf8_unicode_to_native);
XS(XS_utf8_native_to_unicode);
+XS(XS_Internals_SvREADONLY);
+XS(XS_Internals_SvREFCNT);
+XS(XS_Internals_hv_clear_placehold);
void
Perl_boot_core_UNIVERSAL(pTHX)
newXS("utf8::downgrade", XS_utf8_downgrade, file);
newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
+ newXSproto("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$");
+ newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, file, "\\[$%@];$");
+ newXSproto("Internals::hv_clear_placeholders",
+ XS_Internals_hv_clear_placehold, file, "\\%");
}
STRLEN len;
SV *req = ST(1);
- if (undef)
- Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
- HvNAME(pkg), HvNAME(pkg));
-
+ if (undef) {
+ if (pkg)
+ Perl_croak(aTHX_
+ "%s does not define $%s::VERSION--version check failed",
+ HvNAME(pkg), HvNAME(pkg));
+ else {
+ char *str = SvPVx(ST(0), len);
+
+ Perl_croak(aTHX_
+ "%s defines neither package nor VERSION--version check failed", str);
+ }
+ }
if (!SvNIOK(sv) && SvPOK(sv)) {
char *str = SvPVx(sv,len);
while (len) {
XSRETURN(1);
}
+XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */
+{
+ dXSARGS;
+ SV *sv = SvRV(ST(0));
+ if (items == 1) {
+ if (SvREADONLY(sv))
+ XSRETURN_YES;
+ else
+ XSRETURN_NO;
+ }
+ else if (items == 2) {
+ if (SvTRUE(ST(1))) {
+ SvREADONLY_on(sv);
+ XSRETURN_YES;
+ }
+ else {
+ /* I hope you really know what you are doing. */
+ SvREADONLY_off(sv);
+ XSRETURN_NO;
+ }
+ }
+ XSRETURN_UNDEF; /* Can't happen. */
+}
+XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */
+{
+ dXSARGS;
+ SV *sv = SvRV(ST(0));
+ if (items == 1)
+ XSRETURN_IV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */
+ else if (items == 2) {
+ /* I hope you really know what you are doing. */
+ SvREFCNT(sv) = SvIV(ST(1));
+ XSRETURN_IV(SvREFCNT(sv));
+ }
+ XSRETURN_UNDEF; /* Can't happen. */
+}
+
+/* Maybe this should return the number of placeholders found in scalar context,
+ and a list of them in list context. */
+XS(XS_Internals_hv_clear_placehold)
+{
+ dXSARGS;
+ HV *hv = (HV *) SvRV(ST(0));
+
+ /* I don't care how many parameters were passed in, but I want to avoid
+ the unused variable warning. */
+
+ items = (I32)HvPLACEHOLDERS(hv);
+
+ if (items) {
+ HE *entry;
+ I32 riter = HvRITER(hv);
+ HE *eiter = HvEITER(hv);
+ hv_iterinit(hv);
+ /* This may look suboptimal with the items *after* the iternext, but
+ it's quite deliberate. We only get here with items==0 if we've
+ just deleted the last placeholder in the hash. If we've just done
+ that then it means that the hash is in lazy delete mode, and the
+ HE is now only referenced in our iterator. If we just quit the loop
+ and discarded our iterator then the HE leaks. So we do the && the
+ other way to ensure iternext is called just one more time, which
+ has the side effect of triggering the lazy delete. */
+ while ((entry = hv_iternext_flags(hv, HV_ITERNEXT_WANTPLACEHOLDERS))
+ && items) {
+ SV *val = hv_iterval(hv, entry);
+
+ if (val == &PL_sv_undef) {
+
+ /* It seems that I have to go back in the front of the hash
+ API to delete a hash, even though I have a HE structure
+ pointing to the very entry I want to delete, and could hold
+ onto the previous HE that points to it. And it's easier to
+ go in with SVs as I can then specify the precomputed hash,
+ and don't have fun and games with utf8 keys. */
+ SV *key = hv_iterkeysv(entry);
+
+ hv_delete_ent (hv, key, G_DISCARD, HeHASH(entry));
+ items--;
+ }
+ }
+ HvRITER(hv) = riter;
+ HvEITER(hv) = eiter;
+ }
+
+ XSRETURN(0);
+}
projects / p5sagit/p5-mst-13.2.git / blobdiff