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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.inc"
#include "keywords.h"
#include "feature.h"
static const char S_autoload[] = "AUTOLOAD";
#define S_autolen (sizeof("AUTOLOAD")-1)
GV *
Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
{
SV **where;
PERL_DTRACE_PROBE_GLOB_ENTRY(PERL_DTRACE_GLOB_MODE_ADD, "");
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 = OP_IS_DIRHOP(PL_op->op_type) ?
"dirhandle" : "filehandle";
} else if (type == SVt_PVHV) {
what = "hash";
} else {
what = type == SVt_PVAV ? "array" : "scalar";
}
/* diag_listed_as: Bad symbol for filehandle */
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);
if (type == SVt_PVAV
&& memEQs(GvNAME(gv), GvNAMELEN(gv), "ISA"))
sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
}
PERL_DTRACE_PROBE_GLOB_RETURN(PERL_DTRACE_GLOB_MODE_ADD, "");
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)
{
static char smallbuf[160];
char *tmpbuf;
GV *gv;
const STRLEN tmplen = namelen + 2;
PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
PERL_UNUSED_ARG(flags);
assert(namelen > 0);
if (!PL_defstash)
return NULL;
if (tmplen <= sizeof smallbuf)
tmpbuf = smallbuf;
else {
if (UNLIKELY(tmplen > I32_MAX))
Perl_croak(aTHX_ "panic: gv name too long (%" UVuf ")", (UV) namelen);
Newx(tmpbuf, tmplen+1, char);
}
/* This is where the debugger's %{"::_<$filename"} hash is created */
tmpbuf[0] = '_';
tmpbuf[1] = '<';
memcpy(tmpbuf + 2, name, namelen+1);
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_OR_SAVESRC && !GvAV(gv))
hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
if (tmpbuf != smallbuf && tmplen > sizeof 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
C<NULL>.
=cut
*/
SV *
Perl_gv_const_sv(pTHX_ GV *gv)
{
PERL_ARGS_ASSERT_GV_CONST_SV;
PERL_UNUSED_CONTEXT;
if (SvTYPE(gv) == SVt_PVGV)
return cv_const_sv(GvCVu(gv));
return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV && SvTYPE(SvRV(gv)) != SVt_PVCV ? SvRV(gv) : NULL;
}
GP *
Perl_newGP(pTHX_ GV *const gv)
{
GP *gp;
const char *file;
STRLEN len;
#ifndef USE_ITHREADS
GV *filegv;
#endif
U32 hash;
dVAR;
PERL_ARGS_ASSERT_NEWGP;
Newxz(gp, 1, GP);
gp->gp_egv = gv; /* allow compiler to reuse gv after this */
#ifndef PERL_DONT_CREATE_GVSV
gp->gp_sv = newSV(0);
#endif
/* PL_curcop may be null here. E.g.,
INIT { bless {} and exit }
frees INIT before looking up DESTROY (and creating *DESTROY)
*/
if (PL_curcop) {
gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
#ifdef USE_ITHREADS
if (CopFILE(PL_curcop)) {
file = CopFILE(PL_curcop);
len = strlen(file);
}
#else
filegv = CopFILEGV(PL_curcop);
if (filegv) {
file = GvNAME(filegv)+2;
len = GvNAMELEN(filegv)-2;
}
#endif
else goto no_file;
}
else {
no_file:
file = "";
len = 0;
}
PERL_HASH(hash, file, len);
if (UNLIKELY(len > I32_MAX))
Perl_croak(aTHX_ "panic: file name too long (%" UVuf ")", (UV) len);
gp->gp_file_hek = share_hek(file, len, hash);
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 = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
HEK *hek;
PERL_ARGS_ASSERT_CVGV_SET;
if (oldgv == gv)
return;
if (oldgv) {
if (CvCVGV_RC(cv)) {
SvREFCNT_dec_NN(oldgv);
CvCVGV_RC_off(cv);
}
else {
sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
}
}
else if ((hek = CvNAME_HEK(cv))) {
unshare_hek(hek);
CvLEXICAL_off(cv);
}
CvNAMED_off(cv);
SvANY(cv)->xcv_gv_u.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);
}
}
/* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a
GV, but for efficiency that GV may not in fact exist. This function,
called by CvGV, reifies it. */
GV *
Perl_cvgv_from_hek(pTHX_ CV *cv)
{
GV *gv;
SV **svp;
PERL_ARGS_ASSERT_CVGV_FROM_HEK;
assert(SvTYPE(cv) == SVt_PVCV);
if (!CvSTASH(cv)) return NULL;
ASSUME(CvNAME_HEK(cv));
/* This will fail with missing names from classes */
svp = hv_fetchhek(CvSTASH(cv), CvNAME_HEK(cv), 0);
gv = MUTABLE_GV(svp && *svp ? *svp : newSV(0));
if (!isGV(gv)) {
const HEK *hek = CvNAME_HEK(cv);
gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(hek),
HEK_LEN(hek), SVf_UTF8 * !!HEK_UTF8(hek));
}
if (!CvNAMED(cv)) { /* gv_init took care of it */
assert (SvANY(cv)->xcv_gv_u.xcv_gv == gv);
return gv;
}
unshare_hek(CvNAME_HEK(cv));
CvNAMED_off(cv);
SvANY(cv)->xcv_gv_u.xcv_gv = gv;
if (svp && *svp) SvREFCNT_inc_simple_void_NN(gv);
CvCVGV_RC_on(cv);
return 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));
}
/*
=for apidoc gv_init_pvn
Converts a scalar into a typeglob. This is an incoercible typeglob;
assigning a reference to it will assign to one of its slots, instead of
overwriting it as happens with typeglobs created by C<SvSetSV>. Converting
any scalar that is C<SvOK()> may produce unpredictable results and is reserved
for perl's internal use.
C<gv> is the scalar to be converted.
C<stash> is the parent stash/package, if any.
C<name> and C<len> give the name. The name must be unqualified;
that is, it must not include the package name. If C<gv> is a
stash element, it is the caller's responsibility to ensure that the name
passed to this function matches the name of the element. If it does not
match, perl's internal bookkeeping will get out of sync.
C<flags> can be set to C<SVf_UTF8> if C<name> is a UTF-8 string, or
the return value of SvUTF8(sv). It can also take the
C<GV_ADDMULTI> flag, which means to pretend that the GV has been
seen before (i.e., suppress "Used once" warnings).
=for apidoc gv_init
The old form of C<gv_init_pvn()>. It does not work with UTF-8 strings, as it
has no flags parameter. If the C<multi> parameter is set, the
C<GV_ADDMULTI> flag will be passed to C<gv_init_pvn()>.
=for apidoc gv_init_pv
Same as C<gv_init_pvn()>, but takes a nul-terminated string for the name
instead of separate char * and length parameters.
=for apidoc gv_init_sv
Same as C<gv_init_pvn()>, but takes an SV * for the name instead of separate
char * and length parameters. C<flags> is currently unused.
=cut
*/
void
Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
{
char *namepv;
STRLEN namelen;
PERL_ARGS_ASSERT_GV_INIT_SV;
namepv = SvPV(namesv, namelen);
if (SvUTF8(namesv))
flags |= SVf_UTF8;
gv_init_pvn(gv, stash, namepv, namelen, flags);
}
void
Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
{
PERL_ARGS_ASSERT_GV_INIT_PV;
gv_init_pvn(gv, stash, name, strlen(name), flags);
}
void
Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
{
const U32 old_type = SvTYPE(gv);
const bool doproto = old_type > SVt_NULL;
char * const proto = (doproto && SvPOK(gv))
? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
: NULL;
const STRLEN protolen = proto ? SvCUR(gv) : 0;
SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
PERL_ARGS_ASSERT_GV_INIT_PVN;
assert (!(proto && has_constant));
PERL_DTRACE_PROBE_GLOB_ENTRY(PERL_DTRACE_GLOB_MODE_INIT, name);
if (has_constant) {
/* The constant has to be a scalar, array or subroutine. */
switch (SvTYPE(has_constant)) {
case SVt_PVHV:
case SVt_PVFM:
case SVt_PVIO:
Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
sv_reftype(has_constant, 0));
NOT_REACHED; /* NOTREACHED */
break;
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 if (!GvSTATIC(gv)) {
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));
if (UNLIKELY(len > I32_MAX))
Perl_croak(aTHX_ "panic: gv name too long (%" UVuf ")", (UV) len);
gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
if (flags & GV_ADDMULTI || doproto) /* doproto means it */
GvMULTI_on(gv); /* _was_ mentioned */
if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
/* Not actually a constant. Just a regular sub. */
CV * const cv = (CV *)has_constant;
GvCV_set(gv,cv);
if (CvNAMED(cv) && CvSTASH(cv) == stash && (
CvNAME_HEK(cv) == GvNAME_HEK(gv)
|| ( CvNAMED(cv)
&& HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
&& HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
&& HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
&& memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
)
))
CvGV_set(cv, gv);
}
else if (doproto) {
CV *cv;
if (has_constant) {
/* newCONSTSUB takes ownership of the reference from us. */
cv = newCONSTSUB_flags(stash, name, len, flags, 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 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);
CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
} else {
cv = newSTUB(gv,1);
}
if (proto) {
sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
SV_HAS_TRAILING_NUL);
if ( proto_utf8 ) {
SV* sv = MUTABLE_SV(cv);
if (SvIsCOW(sv)) sv_uncow(sv, 0);
SvUTF8_on(sv);
}
}
}
PERL_DTRACE_PROBE_GLOB_RETURN(PERL_DTRACE_GLOB_MODE_INIT, name);
}
STATIC void
S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
{
PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
switch (sv_type) {
case SVt_PVIO:
(void)GvIOn_NN(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
}
}
static void core_xsub(pTHX_ CV* cv);
static GV *
S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
const char * const name, const STRLEN len)
{
static const char file[] = __FILE__;
CV *cv, *oldcompcv = NULL;
COP *oldcurcop = NULL;
yy_parser *oldparser = NULL;
const int code = keyword(name, len, 1);
int opnum = 0;
I32 oldsavestack_ix = 0;
bool ampable = TRUE; /* &{}-able */
assert(gv || stash);
assert(name);
if (UNLIKELY(len > I32_MAX))
Perl_croak(aTHX_ "panic: keyword name too long (%" UVuf ")", (UV) len);
if (!code) return NULL; /* Not a keyword */
switch (code < 0 ? -code : code) {
/* no support for \&CORE::infix;
no support for funcs that do not parse like funcs */
case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
case KEY_default : case KEY_DESTROY:
case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
case KEY_END : case KEY_eq : case KEY_eval :
case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
case KEY_given : case KEY_goto : case KEY_grep :
case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
case KEY_package: case KEY_print: case KEY_printf:
case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
case KEY_s : case KEY_say : case KEY_sort :
case KEY_state: case KEY_sub :
case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
case KEY_until: case KEY_use : case KEY_when : case KEY_while :
case KEY_x : case KEY_xor : case KEY_y :
return NULL;
case KEY_chdir:
case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
case KEY_eof : case KEY_exec: case KEY_exists :
case KEY_lstat:
case KEY_split:
case KEY_stat:
case KEY_system:
case KEY_truncate: case KEY_unlink:
ampable = FALSE;
}
if (!gv) {
gv = (GV *)newSV(0);
gv_init(gv, stash, name, len, TRUE);
}
GvMULTI_on(gv);
if (ampable) {
ENTER;
oldcurcop = PL_curcop;
oldparser = PL_parser;
lex_start(NULL, NULL, 0);
oldcompcv = PL_compcv;
PL_compcv = NULL; /* Prevent start_subparse from setting
CvOUTSIDE. */
oldsavestack_ix = start_subparse(FALSE,0);
cv = PL_compcv;
}
else {
/* Avoid calling newXS, as it calls us, and things start to
get hairy. */
cv = MUTABLE_CV(newSV_type(SVt_PVCV));
GvCV_set(gv,cv);
GvCVGEN(gv) = 0;
CvISXSUB_on(cv);
CvXSUB(cv) = core_xsub;
PoisonPADLIST(cv);
}
CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
from PL_curcop. */
/* XSUBs can't be perl lang/perl5db.pl debugged
if (PERLDB_LINE_OR_SAVESRC)
(void)gv_fetchfile(file); */
CvFILE(cv) = (char *)file;
/* XXX This is inefficient, as doing things this order causes
a prototype check in newATTRSUB. But we have to do
it this order as we need an op number before calling
new ATTRSUB. */
(void)core_prototype((SV *)cv, name, code, &opnum);
if (stash)
(void)hv_store(stash,name,len,(SV *)gv,0);
if (ampable) {
#ifdef DEBUGGING
CV *orig_cv = cv;
#endif
CvLVALUE_on(cv);
/* newATTRSUB will free the CV and return NULL if we're still
compiling after a syntax error */
if ((cv = newATTRSUB_x(
oldsavestack_ix, (OP *)gv,
NULL,NULL,
coresub_op(
opnum
? newSVuv((UV)opnum)
: newSVpvn(name,len),
code, opnum
),
TRUE
)) != NULL) {
assert(GvCV(gv) == orig_cv);
if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
&& opnum != OP_UNDEF && opnum != OP_KEYS)
CvLVALUE_off(cv); /* Now *that* was a neat trick. */
}
LEAVE;
PL_parser = oldparser;
PL_curcop = oldcurcop;
PL_compcv = oldcompcv;
}
if (cv) {
SV *opnumsv = newSViv(
(opnum == OP_ENTEREVAL && len == 9 && memEQc(name, "evalbytes")) ?
(OP_ENTEREVAL | (1<<16))
: opnum ? opnum : (((I32)name[2]) << 16));
cv_set_call_checker_flags(cv, Perl_ck_entersub_args_core, opnumsv, 0);
SvREFCNT_dec_NN(opnumsv);
}
return gv;
}
/*
=for apidoc gv_fetchmeth
Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
=for apidoc gv_fetchmeth_sv
Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
of an SV instead of a string/length pair.
=cut
*/
GV *
Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
{
char *namepv;
STRLEN namelen;
PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
if (UNLIKELY(SvUTF8(namesv))) flags |= SVf_UTF8;
if (LIKELY(SvPOK_nog(namesv))) /* common case */
return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
/* do the get magic */
namepv = SvPV(namesv, namelen);
return gv_fetchmeth_internal(stash, NULL, namepv, namelen, level, flags);
}
/*
=for apidoc gv_fetchmeth_pv
Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
instead of a string/length pair.
=cut
*/
GV *
Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
{
PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
}
/*
=for apidoc gv_fetchmeth_pvn
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 C<@ISA> and C<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.
The only significant values for C<flags> are C<GV_SUPER>, C<SVf_UTF8>,
and C<GV_CLASS>.
C<GV_SUPER> indicates that we want to look up the method in the superclasses
of the C<stash>.
C<GV_CLASS> allows for non-existing methods to be searched in classes
or readonly packages. Normally a failing lookup will throw a
restricted hash error.
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 */
PERL_STATIC_INLINE GV*
S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len,
I32 level, U32 flags)
{
GV** gvp;
AV* linear_av;
SV** linear_svp;
SV* linear_sv;
HV* cstash, *cachestash;
GV* candidate = NULL;
CV* cand_cv = NULL;
GV* topgv = NULL;
const char *hvname;
I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
/* skip class errors with restricted stashes, to try the next */
I32 action = create | HV_FETCH_JUST_SV | HV_FETCH_ISEXISTS;
I32 items;
U32 topgen_cmp;
const U32 is_utf8 = flags & SVf_UTF8;
const U32 hv_utf8 = is_utf8 ? HVhek_UTF8 : 0;
/* 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 || meth);
DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in %s %s\n",
flags & GV_SUPER ? "SUPER " : "",
name ? name : SvPV_nolen(meth),
HvPKGTYPE_NN(stash), hvname) );
topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
if (flags & GV_SUPER) {
if (!HvAUX(stash)->xhv_mro_meta->super)
HvAUX(stash)->xhv_mro_meta->super = newHV();
cachestash = HvAUX(stash)->xhv_mro_meta->super;
}
else
cachestash = stash;
/* check locally for a real method or a cache entry */
gvp = (GV**)hv_common(cachestash, meth, name, len,
hv_utf8, action, NULL, 0);
if (gvp) {
topgv = *gvp;
have_gv:
assert(topgv);
if (SvTYPE(topgv) != SVt_PVGV) {
if (!name) {
assert(meth);
name = SvPV_nomg(meth, len);
}
gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
}
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_NN(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;
}
else if (stash == cachestash
&& len > 1 /* shortest is uc */
&& memEQs(hvname, HvNAMELEN_get(stash), "CORE")
&& S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
goto have_gv;
}
/* only with global destruction. otherwise just looking at \&->DESTROY
will change constness */
if (UNLIKELY(name && strEQc(name, "DESTROY") && PL_phase == PERL_PHASE_DESTRUCT))
SvREADONLY_off(stash);
linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
action = HV_FETCH_JUST_SV | HV_FETCH_ISEXISTS;
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 @%" HEKf "::ISA",
SVfARG(linear_sv),
HEKfARG(HvNAME_HEK(stash)));
continue;
}
DEBUG_ov(Perl_deb(aTHX_ "Looking for %smethod %s in %s %" HEKf "\n",
flags & GV_SUPER ? "SUPER " : "",
name ? name : SvPV_nolen(meth),
HvPKGTYPE_NN(cstash), HEKfARG(HvNAME_HEK(cstash)) ));
gvp = (GV**)hv_common(cstash, meth, name, len, hv_utf8, action, NULL, 0);
if (!gvp) {
if (len > 1 && HvNAMELEN_get(cstash) == 4) {
const char *hvname = HvNAME(cstash); assert(hvname);
if (memEQc(hvname, "CORE")
&& (candidate = S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)))
goto have_candidate;
}
continue;
}
else candidate = *gvp;
have_candidate:
assert(candidate);
if (SvTYPE(candidate) != SVt_PVGV)
gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
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))) {
CV *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_internal(NULL, meth, name, len, 1,
flags & ~GV_SUPER);
if (candidate) {
cand_cv = GvCV(candidate);
if (topgv && (GvREFCNT(topgv) == 1)
&& (CvROOT(cand_cv) || CvXSUB(cand_cv)))
{
CV *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;
}
GV *
Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len,
I32 level, U32 flags)
{
PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
}
/*
=for apidoc gv_fetchmeth_autoload
This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
parameter.
=for apidoc gv_fetchmeth_sv_autoload
Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
of an SV instead of a string/length pair.
=cut
*/
GV *
Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
{
char *namepv;
STRLEN namelen;
PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
namepv = SvPV(namesv, namelen);
if (SvUTF8(namesv))
flags |= SVf_UTF8;
return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
}
/*
=for apidoc gv_fetchmeth_pv_autoload
Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
instead of a string/length pair.
=cut
*/
GV *
Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
{
PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
}
/*
=for apidoc gv_fetchmeth_pvn_autoload
Same as C<gv_fetchmeth_pvn()>, 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, C<GvCV()>
of the result may be zero.
Currently, the only significant value for C<flags> is C<SVf_UTF8>.
=cut
*/
GV *
Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len,
I32 level, U32 flags)
{
GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_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_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
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_pvn(stash, name, len, 0, flags);
gvp = (GV**)hv_fetch(stash, name,
(flags & SVf_UTF8) ? -(I32)len : (I32)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 C<$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.