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gv.c
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gv.c
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/* gv.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
* 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
* of your inquisitiveness, I shall spend all the rest of my days in answering
* you. What more do you want to know?'
* 'The names of all the stars, and of all living things, and the whole
* history of Middle-earth and Over-heaven and of the Sundering Seas,'
* laughed Pippin.
*
* [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
*/
/*
=head1 GV Functions
A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
It is a structure that holds a pointer to a scalar, an array, a hash etc,
corresponding to $foo, @foo, %foo.
GVs are usually found as values in stashes (symbol table hashes) where
Perl stores its global variables.
=cut
*/
#include "EXTERN.h"
#define PERL_IN_GV_C
#include "perl.h"
#include "overload.c"
static const char S_autoload[] = "AUTOLOAD";
static const STRLEN S_autolen = sizeof(S_autoload)-1;
GV *
Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
{
SV **where;
if (
!gv
|| (
SvTYPE((const SV *)gv) != SVt_PVGV
&& SvTYPE((const SV *)gv) != SVt_PVLV
)
) {
const char *what;
if (type == SVt_PVIO) {
/*
* if it walks like a dirhandle, then let's assume that
* this is a dirhandle.
*/
what = PL_op->op_type == OP_READDIR ||
PL_op->op_type == OP_TELLDIR ||
PL_op->op_type == OP_SEEKDIR ||
PL_op->op_type == OP_REWINDDIR ||
PL_op->op_type == OP_CLOSEDIR ?
"dirhandle" : "filehandle";
/* diag_listed_as: Bad symbol for filehandle */
} else if (type == SVt_PVHV) {
what = "hash";
} else {
what = type == SVt_PVAV ? "array" : "scalar";
}
Perl_croak(aTHX_ "Bad symbol for %s", what);
}
if (type == SVt_PVHV) {
where = (SV **)&GvHV(gv);
} else if (type == SVt_PVAV) {
where = (SV **)&GvAV(gv);
} else if (type == SVt_PVIO) {
where = (SV **)&GvIOp(gv);
} else {
where = &GvSV(gv);
}
if (!*where)
*where = newSV_type(type);
return gv;
}
GV *
Perl_gv_fetchfile(pTHX_ const char *name)
{
PERL_ARGS_ASSERT_GV_FETCHFILE;
return gv_fetchfile_flags(name, strlen(name), 0);
}
GV *
Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
const U32 flags)
{
dVAR;
char smallbuf[128];
char *tmpbuf;
const STRLEN tmplen = namelen + 2;
GV *gv;
PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
PERL_UNUSED_ARG(flags);
if (!PL_defstash)
return NULL;
if (tmplen <= sizeof smallbuf)
tmpbuf = smallbuf;
else
Newx(tmpbuf, tmplen, char);
/* This is where the debugger's %{"::_<$filename"} hash is created */
tmpbuf[0] = '_';
tmpbuf[1] = '<';
memcpy(tmpbuf + 2, name, namelen);
gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
if (!isGV(gv)) {
gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
#ifdef PERL_DONT_CREATE_GVSV
GvSV(gv) = newSVpvn(name, namelen);
#else
sv_setpvn(GvSV(gv), name, namelen);
#endif
}
if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
return gv;
}
/*
=for apidoc gv_const_sv
If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
inlining, or C<gv> is a placeholder reference that would be promoted to such
a typeglob, then returns the value returned by the sub. Otherwise, returns
NULL.
=cut
*/
SV *
Perl_gv_const_sv(pTHX_ GV *gv)
{
PERL_ARGS_ASSERT_GV_CONST_SV;
if (SvTYPE(gv) == SVt_PVGV)
return cv_const_sv(GvCVu(gv));
return SvROK(gv) ? SvRV(gv) : NULL;
}
GP *
Perl_newGP(pTHX_ GV *const gv)
{
GP *gp;
U32 hash;
#ifdef USE_ITHREADS
const char *const file
= (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
const STRLEN len = strlen(file);
#else
SV *const temp_sv = CopFILESV(PL_curcop);
const char *file;
STRLEN len;
PERL_ARGS_ASSERT_NEWGP;
if (temp_sv) {
file = SvPVX(temp_sv);
len = SvCUR(temp_sv);
} else {
file = "";
len = 0;
}
#endif
PERL_HASH(hash, file, len);
Newxz(gp, 1, GP);
#ifndef PERL_DONT_CREATE_GVSV
gp->gp_sv = newSV(0);
#endif
gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
/* XXX Ideally this cast would be replaced with a change to const char*
in the struct. */
gp->gp_file_hek = share_hek(file, len, hash);
gp->gp_egv = gv;
gp->gp_refcnt = 1;
return gp;
}
/* Assign CvGV(cv) = gv, handling weak references.
* See also S_anonymise_cv_maybe */
void
Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
{
GV * const oldgv = CvGV(cv);
PERL_ARGS_ASSERT_CVGV_SET;
if (oldgv == gv)
return;
if (oldgv) {
if (CvCVGV_RC(cv)) {
SvREFCNT_dec(oldgv);
CvCVGV_RC_off(cv);
}
else {
sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
}
}
SvANY(cv)->xcv_gv = gv;
assert(!CvCVGV_RC(cv));
if (!gv)
return;
if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
else {
CvCVGV_RC_on(cv);
SvREFCNT_inc_simple_void_NN(gv);
}
}
/* Assign CvSTASH(cv) = st, handling weak references. */
void
Perl_cvstash_set(pTHX_ CV *cv, HV *st)
{
HV *oldst = CvSTASH(cv);
PERL_ARGS_ASSERT_CVSTASH_SET;
if (oldst == st)
return;
if (oldst)
sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
SvANY(cv)->xcv_stash = st;
if (st)
Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
}
void
Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi)
{
dVAR;
const U32 old_type = SvTYPE(gv);
const bool doproto = old_type > SVt_NULL;
char * const proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
const STRLEN protolen = proto ? SvCUR(gv) : 0;
SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
PERL_ARGS_ASSERT_GV_INIT;
assert (!(proto && has_constant));
if (has_constant) {
/* The constant has to be a simple scalar type. */
switch (SvTYPE(has_constant)) {
case SVt_PVAV:
case SVt_PVHV:
case SVt_PVCV:
case SVt_PVFM:
case SVt_PVIO:
Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
sv_reftype(has_constant, 0));
default: NOOP;
}
SvRV_set(gv, NULL);
SvROK_off(gv);
}
if (old_type < SVt_PVGV) {
if (old_type >= SVt_PV)
SvCUR_set(gv, 0);
sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
}
if (SvLEN(gv)) {
if (proto) {
SvPV_set(gv, NULL);
SvLEN_set(gv, 0);
SvPOK_off(gv);
} else
Safefree(SvPVX_mutable(gv));
}
SvIOK_off(gv);
isGV_with_GP_on(gv);
GvGP_set(gv, Perl_newGP(aTHX_ gv));
GvSTASH(gv) = stash;
if (stash)
Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
gv_name_set(gv, name, len, GV_ADD);
if (multi || doproto) /* doproto means it _was_ mentioned */
GvMULTI_on(gv);
if (doproto) { /* Replicate part of newSUB here. */
CV *cv;
ENTER;
if (has_constant) {
char *name0 = NULL;
if (name[len])
/* newCONSTSUB doesn't take a len arg, so make sure we
* give it a \0-terminated string */
name0 = savepvn(name,len);
/* newCONSTSUB takes ownership of the reference from us. */
cv = newCONSTSUB(stash, (name0 ? name0 : name), has_constant);
/* In case op.c:S_process_special_blocks stole it: */
if (!GvCV(gv))
GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
if (name0)
Safefree(name0);
/* If this reference was a copy of another, then the subroutine
must have been "imported", by a Perl space assignment to a GV
from a reference to CV. */
if (exported_constant)
GvIMPORTED_CV_on(gv);
} else {
(void) start_subparse(0,0); /* Create empty CV in compcv. */
cv = PL_compcv;
GvCV_set(gv,cv);
}
LEAVE;
mro_method_changed_in(GvSTASH(gv)); /* sub Foo::bar($) { (shift) } sub ASDF::baz($); *ASDF::baz = \&Foo::bar */
CvGV_set(cv, gv);
CvFILE_set_from_cop(cv, PL_curcop);
CvSTASH_set(cv, PL_curstash);
if (proto) {
sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
SV_HAS_TRAILING_NUL);
}
}
}
STATIC void
S_gv_init_sv(pTHX_ GV *gv, const svtype sv_type)
{
PERL_ARGS_ASSERT_GV_INIT_SV;
switch (sv_type) {
case SVt_PVIO:
(void)GvIOn(gv);
break;
case SVt_PVAV:
(void)GvAVn(gv);
break;
case SVt_PVHV:
(void)GvHVn(gv);
break;
#ifdef PERL_DONT_CREATE_GVSV
case SVt_NULL:
case SVt_PVCV:
case SVt_PVFM:
case SVt_PVGV:
break;
default:
if(GvSVn(gv)) {
/* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
If we just cast GvSVn(gv) to void, it ignores evaluating it for
its side effect */
}
#endif
}
}
/*
=for apidoc gv_fetchmeth
Returns the glob with the given C<name> and a defined subroutine or
C<NULL>. The glob lives in the given C<stash>, or in the stashes
accessible via @ISA and UNIVERSAL::.
The argument C<level> should be either 0 or -1. If C<level==0>, as a
side-effect creates a glob with the given C<name> in the given C<stash>
which in the case of success contains an alias for the subroutine, and sets
up caching info for this glob.
This function grants C<"SUPER"> token as a postfix of the stash name. The
GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
visible to Perl code. So when calling C<call_sv>, you should not use
the GV directly; instead, you should use the method's CV, which can be
obtained from the GV with the C<GvCV> macro.
=cut
*/
/* NOTE: No support for tied ISA */
GV *
Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
{
dVAR;
GV** gvp;
AV* linear_av;
SV** linear_svp;
SV* linear_sv;
HV* cstash;
GV* candidate = NULL;
CV* cand_cv = NULL;
CV* old_cv;
GV* topgv = NULL;
const char *hvname;
I32 create = (level >= 0) ? 1 : 0;
I32 items;
STRLEN packlen;
U32 topgen_cmp;
PERL_ARGS_ASSERT_GV_FETCHMETH;
/* UNIVERSAL methods should be callable without a stash */
if (!stash) {
create = 0; /* probably appropriate */
if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
return 0;
}
assert(stash);
hvname = HvNAME_get(stash);
if (!hvname)
Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
assert(hvname);
assert(name);
DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
/* check locally for a real method or a cache entry */
gvp = (GV**)hv_fetch(stash, name, len, create);
if(gvp) {
topgv = *gvp;
assert(topgv);
if (SvTYPE(topgv) != SVt_PVGV)
gv_init(topgv, stash, name, len, TRUE);
if ((cand_cv = GvCV(topgv))) {
/* If genuine method or valid cache entry, use it */
if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
return topgv;
}
else {
/* stale cache entry, junk it and move on */
SvREFCNT_dec(cand_cv);
GvCV_set(topgv, NULL);
cand_cv = NULL;
GvCVGEN(topgv) = 0;
}
}
else if (GvCVGEN(topgv) == topgen_cmp) {
/* cache indicates no such method definitively */
return 0;
}
}
packlen = HvNAMELEN_get(stash);
if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
HV* basestash;
packlen -= 7;
basestash = gv_stashpvn(hvname, packlen, GV_ADD);
linear_av = mro_get_linear_isa(basestash);
}
else {
linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
}
linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
items = AvFILLp(linear_av); /* no +1, to skip over self */
while (items--) {
linear_sv = *linear_svp++;
assert(linear_sv);
cstash = gv_stashsv(linear_sv, 0);
if (!cstash) {
Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA",
SVfARG(linear_sv), hvname);
continue;
}
assert(cstash);
gvp = (GV**)hv_fetch(cstash, name, len, 0);
if (!gvp) continue;
candidate = *gvp;
assert(candidate);
if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, cstash, name, len, TRUE);
if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
/*
* Found real method, cache method in topgv if:
* 1. topgv has no synonyms (else inheritance crosses wires)
* 2. method isn't a stub (else AUTOLOAD fails spectacularly)
*/
if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv);
SvREFCNT_inc_simple_void_NN(cand_cv);
GvCV_set(topgv, cand_cv);
GvCVGEN(topgv) = topgen_cmp;
}
return candidate;
}
}
/* Check UNIVERSAL without caching */
if(level == 0 || level == -1) {
candidate = gv_fetchmeth(NULL, name, len, 1);
if(candidate) {
cand_cv = GvCV(candidate);
if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv);
SvREFCNT_inc_simple_void_NN(cand_cv);
GvCV_set(topgv, cand_cv);
GvCVGEN(topgv) = topgen_cmp;
}
return candidate;
}
}
if (topgv && GvREFCNT(topgv) == 1) {
/* cache the fact that the method is not defined */
GvCVGEN(topgv) = topgen_cmp;
}
return 0;
}
/*
=for apidoc gv_fetchmeth_autoload
Same as gv_fetchmeth(), but looks for autoloaded subroutines too.
Returns a glob for the subroutine.
For an autoloaded subroutine without a GV, will create a GV even
if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
of the result may be zero.
=cut
*/
GV *
Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level)
{
GV *gv = gv_fetchmeth(stash, name, len, level);
PERL_ARGS_ASSERT_GV_FETCHMETH_AUTOLOAD;
if (!gv) {
CV *cv;
GV **gvp;
if (!stash)
return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
return NULL;
if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
return NULL;
cv = GvCV(gv);
if (!(CvROOT(cv) || CvXSUB(cv)))
return NULL;
/* Have an autoload */
if (level < 0) /* Cannot do without a stub */
gv_fetchmeth(stash, name, len, 0);
gvp = (GV**)hv_fetch(stash, name, len, (level >= 0));
if (!gvp)
return NULL;
return *gvp;
}
return gv;
}
/*
=for apidoc gv_fetchmethod_autoload
Returns the glob which contains the subroutine to call to invoke the method
on the C<stash>. In fact in the presence of autoloading this may be the
glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
already setup.
The third parameter of C<gv_fetchmethod_autoload> determines whether
AUTOLOAD lookup is performed if the given method is not present: non-zero
means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
with a non-zero C<autoload> parameter.
These functions grant C<"SUPER"> token as a prefix of the method name. Note
that if you want to keep the returned glob for a long time, you need to
check for it being "AUTOLOAD", since at the later time the call may load a
different subroutine due to $AUTOLOAD changing its value. Use the glob
created via a side effect to do this.
These functions have the same side-effects and as C<gv_fetchmeth> with
C<level==0>. C<name> should be writable if contains C<':'> or C<'
''>. The warning against passing the GV returned by C<gv_fetchmeth> to
C<call_sv> apply equally to these functions.
=cut
*/
STATIC HV*
S_gv_get_super_pkg(pTHX_ const char* name, I32 namelen)
{
AV* superisa;
GV** gvp;
GV* gv;
HV* stash;
PERL_ARGS_ASSERT_GV_GET_SUPER_PKG;
stash = gv_stashpvn(name, namelen, 0);
if(stash) return stash;
/* If we must create it, give it an @ISA array containing
the real package this SUPER is for, so that it's tied
into the cache invalidation code correctly */
stash = gv_stashpvn(name, namelen, GV_ADD);
gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
gv = *gvp;
gv_init(gv, stash, "ISA", 3, TRUE);
superisa = GvAVn(gv);
GvMULTI_on(gv);
sv_magic(MUTABLE_SV(superisa), MUTABLE_SV(gv), PERL_MAGIC_isa, NULL, 0);
#ifdef USE_ITHREADS
av_push(superisa, newSVpv(CopSTASHPV(PL_curcop), 0));
#else
av_push(superisa, newSVhek(CopSTASH(PL_curcop)
? HvNAME_HEK(CopSTASH(PL_curcop)) : NULL));
#endif
return stash;
}
GV *
Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
{
PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
}
/* Don't merge this yet, as it's likely to get a len parameter, and possibly
even a U32 hash */
GV *
Perl_gv_fetchmethod_flags(pTHX_ HV *stash, const char *name, U32 flags)
{
dVAR;
register const char *nend;
const char *nsplit = NULL;
GV* gv;
HV* ostash = stash;
const char * const origname = name;
SV *const error_report = MUTABLE_SV(stash);
const U32 autoload = flags & GV_AUTOLOAD;
const U32 do_croak = flags & GV_CROAK;
PERL_ARGS_ASSERT_GV_FETCHMETHOD_FLAGS;
if (SvTYPE(stash) < SVt_PVHV)
stash = NULL;
else {
/* The only way stash can become NULL later on is if nsplit is set,
which in turn means that there is no need for a SVt_PVHV case
the error reporting code. */
}
for (nend = name; *nend; nend++) {
if (*nend == '\'') {
nsplit = nend;
name = nend + 1;
}
else if (*nend == ':' && *(nend + 1) == ':') {
nsplit = nend++;
name = nend + 1;
}
}
if (nsplit) {
if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
/* ->SUPER::method should really be looked up in original stash */
SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER",
CopSTASHPV(PL_curcop)));
/* __PACKAGE__::SUPER stash should be autovivified */
stash = gv_get_super_pkg(SvPVX_const(tmpstr), SvCUR(tmpstr));
DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
origname, HvNAME_get(stash), name) );
}
else {
/* don't autovifify if ->NoSuchStash::method */
stash = gv_stashpvn(origname, nsplit - origname, 0);
/* however, explicit calls to Pkg::SUPER::method may
happen, and may require autovivification to work */
if (!stash && (nsplit - origname) >= 7 &&
strnEQ(nsplit - 7, "::SUPER", 7) &&
gv_stashpvn(origname, nsplit - origname - 7, 0))
stash = gv_get_super_pkg(origname, nsplit - origname);
}
ostash = stash;
}
gv = gv_fetchmeth(stash, name, nend - name, 0);
if (!gv) {
if (strEQ(name,"import") || strEQ(name,"unimport"))
gv = MUTABLE_GV(&PL_sv_yes);
else if (autoload)
gv = gv_autoload4(ostash, name, nend - name, TRUE);
if (!gv && do_croak) {
/* Right now this is exclusively for the benefit of S_method_common
in pp_hot.c */
if (stash) {
/* If we can't find an IO::File method, it might be a call on
* a filehandle. If IO:File has not been loaded, try to
* require it first instead of croaking */
const char *stash_name = HvNAME_get(stash);
if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
&& !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
STR_WITH_LEN("IO/File.pm"), 0,
HV_FETCH_ISEXISTS, NULL, 0)
) {
require_pv("IO/File.pm");
gv = gv_fetchmeth(stash, name, nend - name, 0);
if (gv)
return gv;
}
Perl_croak(aTHX_
"Can't locate object method \"%s\" via package \"%.*s\"",
name, (int)HvNAMELEN_get(stash), HvNAME_get(stash));
}
else {
STRLEN packlen;
const char *packname;
if (nsplit) {
packlen = nsplit - origname;
packname = origname;
} else {
packname = SvPV_const(error_report, packlen);
}
Perl_croak(aTHX_
"Can't locate object method \"%s\" via package \"%.*s\""
" (perhaps you forgot to load \"%.*s\"?)",
name, (int)packlen, packname, (int)packlen, packname);
}
}
}
else if (autoload) {
CV* const cv = GvCV(gv);
if (!CvROOT(cv) && !CvXSUB(cv)) {
GV* stubgv;
GV* autogv;
if (CvANON(cv))
stubgv = gv;
else {
stubgv = CvGV(cv);
if (GvCV(stubgv) != cv) /* orphaned import */
stubgv = gv;
}
autogv = gv_autoload4(GvSTASH(stubgv),
GvNAME(stubgv), GvNAMELEN(stubgv), TRUE);
if (autogv)
gv = autogv;
}
}
return gv;
}
GV*
Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method)
{
dVAR;
GV* gv;
CV* cv;
HV* varstash;
GV* vargv;
SV* varsv;
const char *packname = "";
STRLEN packname_len = 0;
PERL_ARGS_ASSERT_GV_AUTOLOAD4;
if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
return NULL;
if (stash) {
if (SvTYPE(stash) < SVt_PVHV) {
packname = SvPV_const(MUTABLE_SV(stash), packname_len);
stash = NULL;
}
else {
packname = HvNAME_get(stash);
packname_len = HvNAMELEN_get(stash);
}
}
if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE)))
return NULL;
cv = GvCV(gv);
if (!(CvROOT(cv) || CvXSUB(cv)))
return NULL;
/*
* Inheriting AUTOLOAD for non-methods works ... for now.
*/
if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash)
)
Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
"Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated",
packname, (int)len, name);
if (CvISXSUB(cv)) {
/* rather than lookup/init $AUTOLOAD here
* only to have the XSUB do another lookup for $AUTOLOAD
* and split that value on the last '::',
* pass along the same data via some unused fields in the CV
*/
CvSTASH_set(cv, stash);
SvPV_set(cv, (char *)name); /* cast to lose constness warning */
SvCUR_set(cv, len);
return gv;
}
/*
* Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
* The subroutine's original name may not be "AUTOLOAD", so we don't
* use that, but for lack of anything better we will use the sub's
* original package to look up $AUTOLOAD.
*/
varstash = GvSTASH(CvGV(cv));
vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
ENTER;
if (!isGV(vargv)) {
gv_init(vargv, varstash, S_autoload, S_autolen, FALSE);
#ifdef PERL_DONT_CREATE_GVSV
GvSV(vargv) = newSV(0);
#endif
}
LEAVE;
varsv = GvSVn(vargv);
sv_setpvn(varsv, packname, packname_len);
sv_catpvs(varsv, "::");
/* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
sv_catpvn_mg(varsv, name, len);
return gv;
}
/* require_tie_mod() internal routine for requiring a module
* that implements the logic of automatic ties like %! and %-
*
* The "gv" parameter should be the glob.
* "varpv" holds the name of the var, used for error messages.
* "namesv" holds the module name. Its refcount will be decremented.
* "methpv" holds the method name to test for to check that things
* are working reasonably close to as expected.
* "flags": if flag & 1 then save the scalar before loading.
* For the protection of $! to work (it is set by this routine)
* the sv slot must already be magicalized.
*/
STATIC HV*
S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
{
dVAR;
HV* stash = gv_stashsv(namesv, 0);
PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
if (!stash || !(gv_fetchmethod(stash, methpv))) {
SV *module = newSVsv(namesv);
char varname = *varpv; /* varpv might be clobbered by load_module,
so save it. For the moment it's always
a single char. */
dSP;
ENTER;
if ( flags & 1 )
save_scalar(gv);
PUSHSTACKi(PERLSI_MAGIC);
Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
POPSTACK;
LEAVE;
SPAGAIN;
stash = gv_stashsv(namesv, 0);
if (!stash)
Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
varname, SVfARG(namesv));
else if (!gv_fetchmethod(stash, methpv))
Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
varname, SVfARG(namesv), methpv);
}
SvREFCNT_dec(namesv);
return stash;
}
/*
=for apidoc gv_stashpv
Returns a pointer to the stash for a specified package. Uses C<strlen> to
determine the length of C<name>, then calls C<gv_stashpvn()>.
=cut
*/
HV*
Perl_gv_stashpv(pTHX_ const char *name, I32 create)
{
PERL_ARGS_ASSERT_GV_STASHPV;
return gv_stashpvn(name, strlen(name), create);
}
/*
=for apidoc gv_stashpvn
Returns a pointer to the stash for a specified package. The C<namelen>
parameter indicates the length of the C<name>, in bytes. C<flags> is passed
to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
created if it does not already exist. If the package does not exist and
C<flags> is 0 (or any other setting that does not create packages) then NULL
is returned.
=cut
*/
HV*
Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
{
char smallbuf[128];
char *tmpbuf;
HV *stash;
GV *tmpgv;
U32 tmplen = namelen + 2;
PERL_ARGS_ASSERT_GV_STASHPVN;
if (tmplen <= sizeof smallbuf)
tmpbuf = smallbuf;
else
Newx(tmpbuf, tmplen, char);
Copy(name, tmpbuf, namelen, char);
tmpbuf[namelen] = ':';
tmpbuf[namelen+1] = ':';
tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
if (tmpbuf != smallbuf)
Safefree(tmpbuf);
if (!tmpgv)
return NULL;
stash = GvHV(tmpgv);
if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
assert(stash);
if (!HvNAME_get(stash)) {
hv_name_set(stash, name, namelen, 0);
/* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
/* If the containing stash has multiple effective
names, see that this one gets them, too. */
if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
mro_package_moved(stash, NULL, tmpgv, 1);
}
return stash;
}
/*
=for apidoc gv_stashsv
Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
=cut
*/
HV*
Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
{
STRLEN len;
const char * const ptr = SvPV_const(sv,len);
PERL_ARGS_ASSERT_GV_STASHSV;
return gv_stashpvn(ptr, len, flags);
}
GV *
Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
PERL_ARGS_ASSERT_GV_FETCHPV;
return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
}