/*
----------------------------------------------------------------------------
Devel::MRO/mro_compat.h - Provides mro functions for XS modules
Copyright (c) 2008-2009, Goro Fuji (gfx) <gfuji(at)cpan.org>.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
----------------------------------------------------------------------------
Usage:
#include "mro_compat.h"
Functions:
AV* mro_get_linear_isa(HV* stash)
UV mro_get_pkg_gen(HV* stash)
void mro_method_changed_in(HV* stash)
See "perldoc Devel::MRO" for details.
*/
#ifdef mro_get_linear_isa /* >= 5.10.0 */
/* NOTE:
Because ActivePerl 5.10.0 does not provide Perl_mro_meta_init(),
which is used in HvMROMETA() macro, this mro_get_pkg_gen() refers
to xhv_mro_meta directly.
*/
/* compatible with &mro::get_pkg_gen() */
#ifndef mro_get_pkg_gen
#define mro_get_pkg_gen(stash) (HvAUX(stash) ? HvAUX(stash)->xhv_mro_meta->pkg_gen : (U32)0)
#endif
#ifndef mro_get_cache_gen
#define mro_get_cache_gen(stash) (HvAUX(stash) ? HvAUX(stash)->xhv_mro_meta->cache_gen : (U32)0)
#endif
/* pkg_gen + cache_gen */
#ifndef mro_get_gen
#define mro_get_gen(stash) (HvAUX(stash) ? (HvAUX(stash)->xhv_mro_meta->pkg_gen + HvAUX(stash)->xhv_mro_meta->cache_gen) : (U32)0)
#endif
#else /* < 5.10.0 */
#define mro_get_linear_isa(stash) my_mro_get_linear_isa(aTHX_ stash)
#define mro_method_changed_in(stash) ((void)stash, (void)PL_sub_generation++)
#define mro_get_pkg_gen(stash) ((void)stash, PL_sub_generation)
#define mro_get_cache_gen(stash) ((void)stash, (I32)0) /* ??? */
#define mro_get_gen(stash) ((void)stash, PL_sub_generation)
#if defined(NEED_mro_get_linear_isa) && !defined(NEED_mro_get_linear_isa_GLOBAL)
static AV* my_mro_get_linear_isa(pTHX_ HV* const stash);
static
#else
extern AV* my_mro_get_linear_isa(pTHX_ HV* const stash);
#endif /* !NEED_mro_get_linear_isa */
#if defined(NEED_mro_get_linear_isa) || defined(NEED_mro_get_linear_isa_GLOBAL)
#define ISA_CACHE "::Devel::MRO::"
/* call &mro::get_linear_isa, which is actually &MRO::Compat::__get_linear_isa */
AV*
my_mro_get_linear_isa(pTHX_ HV* const stash){
GV* cachegv;
AV* isa; /* linearized ISA cache */
SV* gen; /* package generation */
CV* get_linear_isa;
assert(stash);
assert(SvTYPE(stash) == SVt_PVHV);
assert(HvNAME(stash));
/* PerlIO_printf(Perl_debug_log, "mro_get_linear_isa(%s)\n", HvNAME(stash)); //*/
cachegv = *(GV**)hv_fetchs(stash, ISA_CACHE, TRUE);
if(!isGV(cachegv))
gv_init(cachegv, stash, ISA_CACHE, sizeof(ISA_CACHE)-1, GV_ADD);
isa = GvAVn(cachegv);
#ifdef GvSVn
gen = GvSVn(cachegv);
#else
gen = GvSV(cachegv);
#endif
if(SvIOK(gen) && SvIVX(gen) == (IV)mro_get_pkg_gen(stash)){
return isa; /* returns the cache if available */
}
get_linear_isa = get_cv("mro::get_linear_isa", FALSE);
if(!get_linear_isa){
ENTER;
SAVETMPS;
Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, newSVpvs("MRO::Compat"), NULL, NULL);
get_linear_isa = get_cv("mro::get_linear_isa", TRUE);
FREETMPS;
LEAVE;
}
{
SV* avref;
dSP;
ENTER;
SAVETMPS;
PUSHMARK(SP);
mXPUSHp(HvNAME(stash), strlen(HvNAME(stash)));
PUTBACK;
call_sv((SV*)get_linear_isa, G_SCALAR);
SPAGAIN;
avref = POPs;
PUTBACK;
if(SvROK(avref) && SvTYPE(SvRV(avref)) == SVt_PVAV){
AV* const av = (AV*)SvRV(avref);
I32 const len = AvFILLp(av) + 1;
I32 i;
SvREADONLY_off(isa);
av_fill(isa, len-1);
for(i = 0; i < len; i++){
HV* const st = gv_stashsv(AvARRAY(av)[i], TRUE); /* to normalize the stash name */
SV* const sv = *av_fetch(isa, i, TRUE);
sv_setpv(sv, HvNAME(st));
}
SvREADONLY_on(isa);
}
else{
Perl_croak(aTHX_ "panic: mro::get_linear_isa() didn't return an ARRAY reference");
}
FREETMPS;
LEAVE;
}
sv_setiv(gen, (IV)mro_get_pkg_gen(stash));
return isa;
}
#undef ISA_CACHE
#endif /* !(defined(NEED_mro_get_linear_isa) || defined(NEED_mro_get_linear_isa_GLOBAL)) */
#endif /* end of the file */