[gitmo/Class-C3-XS.git] / XS.xs


#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

/* Most of this code is backported from the bleadperl patch's
   mro.c, and then modified to work with Class::C3's
   internals.
*/

AV*
__mro_linear_isa_c3(pTHX_ HV* stash, HV* cache, I32 level)
{
    AV* retval;
    GV** gvp;
    GV* gv;
    AV* isa;
    const char* stashname;
    STRLEN stashname_len;

    assert(stash);
    assert(HvAUX(stash));

    stashname = HvNAME(stash);
    stashname_len = strlen(stashname);
    if (!stashname)
      Perl_croak(aTHX_
                 "Can't linearize anonymous symbol table");

    if (level > 100)
        Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
              stashname);

    if(!cache) {
        cache = (HV*)sv_2mortal((SV*)newHV());
    }
    else {
        SV** cache_entry = hv_fetch(cache, stashname, stashname_len, 0);
        if(cache_entry)
            return (AV*)SvREFCNT_inc(*cache_entry);
    }

    /* not in cache, make a new one */

    retval = (AV*)sv_2mortal((SV*)newAV());
    av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */

    gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
    isa = (gvp && (gv = *gvp) && gv != (GV*)&PL_sv_undef) ? GvAV(gv) : NULL;

    if(isa && AvFILLp(isa) >= 0) {
        SV** seqs_ptr;
        I32 seqs_items;
        HV* tails = (HV*)sv_2mortal((SV*)newHV());
        AV* seqs = (AV*)sv_2mortal((SV*)newAV());
        I32 items = AvFILLp(isa) + 1;
        SV** isa_ptr = AvARRAY(isa);
        while(items--) {
            AV* isa_lin;
            SV* isa_item = *isa_ptr++;
            HV* isa_item_stash = gv_stashsv(isa_item, 0);
            if(!isa_item_stash) {
                isa_lin = newAV();
                av_push(isa_lin, newSVsv(isa_item));
            }
            else {
                isa_lin = (AV*)sv_2mortal((SV*)__mro_linear_isa_c3(aTHX_ isa_item_stash, cache, level + 1)); /* recursion */
            }
            av_push(seqs, (SV*)av_make(AvFILLp(isa_lin)+1, AvARRAY(isa_lin)));
        }
        av_push(seqs, (SV*)av_make(AvFILLp(isa)+1, AvARRAY(isa)));

        seqs_ptr = AvARRAY(seqs);
        seqs_items = AvFILLp(seqs) + 1;
        while(seqs_items--) {
            AV* seq = (AV*)*seqs_ptr++;
            I32 seq_items = AvFILLp(seq);
            if(seq_items > 0) {
                SV** seq_ptr = AvARRAY(seq) + 1;
                while(seq_items--) {
                    SV* seqitem = *seq_ptr++;
                    HE* he = hv_fetch_ent(tails, seqitem, 0, 0);
                    if(!he) {
                        hv_store_ent(tails, seqitem, newSViv(1), 0);
                    }
                    else {
                        SV* val = HeVAL(he);
                        sv_inc(val);
                    }
                }
            }
        }

        while(1) {
            SV* seqhead = NULL;
            SV* cand = NULL;
            SV* winner = NULL;
            SV* val;
            HE* tail_entry;
            AV* seq;
            SV** avptr = AvARRAY(seqs);
            items = AvFILLp(seqs)+1;
            while(items--) {
                SV** svp;
                seq = (AV*)*avptr++;
                if(AvFILLp(seq) < 0) continue;
                svp = av_fetch(seq, 0, 0);
                seqhead = *svp;
                if(!winner) {
                    cand = seqhead;
                    if((tail_entry = hv_fetch_ent(tails, cand, 0, 0))
                       && (val = HeVAL(tail_entry))
                       && (SvIVx(val) > 0))
                           continue;
                    winner = newSVsv(cand);
                    av_push(retval, winner);
                }
                if(!sv_cmp(seqhead, winner)) {
                    sv_2mortal(av_shift(seq));
                    if(AvFILLp(seq) < 0) continue;
                    svp = av_fetch(seq, 0, 0);
                    seqhead = *svp;
                    tail_entry = hv_fetch_ent(tails, seqhead, 0, 0);
                    val = HeVAL(tail_entry);
                    sv_dec(val);
                }
            }
            if(!cand) break;
            if(!winner)
                Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': "
                    "merging failed on parent '%s'", stashname, SvPV_nolen(cand));
        }
    }

    SvREADONLY_on(retval);
    SvREFCNT_inc(retval); /* for cache storage */
    SvREFCNT_inc(retval); /* for return */
    hv_store(cache, stashname, stashname_len, (SV*)retval, 0);
    return retval;
}

STATIC I32
__dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) {
    I32 i;
    for (i = startingblock; i >= 0; i--) {
        if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i;
    }
    return i;
}

STATIC SV*
__nextcan(pTHX_ SV* self, I32 throw_nomethod)
{
    register I32 cxix;
    register const PERL_CONTEXT *ccstack = cxstack;
    const PERL_SI *top_si = PL_curstackinfo;
    HV* selfstash;
    GV* cvgv;
    SV *stashname;
    const char *fq_subname;
    const char *subname;
    STRLEN fq_subname_len;
    STRLEN stashname_len;
    STRLEN subname_len;
    SV* sv;
    GV** gvp;
    AV* linear_av;
    SV** linear_svp;
    SV* linear_sv;
    HV* cstash;
    GV* candidate = NULL;
    CV* cand_cv = NULL;
    const char *hvname;
    I32 items;
    HV* nmcache;
    HE* cache_entry;
    SV* cachekey;

    if(sv_isobject(self))
        selfstash = SvSTASH(SvRV(self));
    else
        selfstash = gv_stashsv(self, 0);

    assert(selfstash);

    hvname = HvNAME(selfstash);
    if (!hvname)
        croak("Can't use anonymous symbol table for method lookup");

    cxix = __dopoptosub_at(cxstack, cxstack_ix);

    /* This block finds the contextually-enclosing fully-qualified subname,
       much like looking at (caller($i))[3] until you find a real sub that
       isn't ANON, etc */
    for (;;) {
        /* we may be in a higher stacklevel, so dig down deeper */
        while (cxix < 0) {
            if(top_si->si_type == PERLSI_MAIN)
                croak("next::method/next::can/maybe::next::method must be used in method context");
            top_si = top_si->si_prev;
            ccstack = top_si->si_cxstack;
            cxix = __dopoptosub_at(ccstack, top_si->si_cxix);
        }

        if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB
          || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) {
            cxix = __dopoptosub_at(ccstack, cxix - 1);
            continue;
        }

        {
            const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1);
            if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) {
                if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) {
                    cxix = dbcxix;
                    continue;
                }
            }
        }

        cvgv = CvGV(ccstack[cxix].blk_sub.cv);

        if(!isGV(cvgv)) {
            cxix = __dopoptosub_at(ccstack, cxix - 1);
            continue;
        }

        /* we found a real sub here */
        sv = sv_2mortal(newSV(0));

        gv_efullname3(sv, cvgv, NULL);

        fq_subname = SvPVX(sv);
        fq_subname_len = SvCUR(sv);

        subname = strrchr(fq_subname, ':');
        if(!subname)
            croak("next::method/next::can/maybe::next::method cannot find enclosing method");

        subname++;
        subname_len = fq_subname_len - (subname - fq_subname);
        if(subname_len == 8 && strEQ(subname, "__ANON__")) {
            cxix = __dopoptosub_at(ccstack, cxix - 1);
            continue;
        }
        break;
    }

    /* If we made it to here, we found our context */

    /* cachekey = "objpkg|context::method::name" */
    cachekey = sv_2mortal(newSVpv(hvname, 0));
    sv_catpvn(cachekey, "|", 1);
    sv_catsv(cachekey, sv);

    nmcache = get_hv("next::METHOD_CACHE", 1);
    if((cache_entry = hv_fetch_ent(nmcache, cachekey, 0, 0))) {
        SV* val = HeVAL(cache_entry);
        if(val == &PL_sv_undef) {
            if(throw_nomethod)
                croak("No next::method '%s' found for %s", subname, hvname);
            return &PL_sv_undef;
        }
        return SvREFCNT_inc(val);
    }

    /* beyond here is just for cache misses, so perf isn't as critical */

    stashname_len = subname - fq_subname - 2;
    stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len));

    linear_av = (AV*)sv_2mortal((SV*)__mro_linear_isa_c3(aTHX_ selfstash, NULL, 0));

    linear_svp = AvARRAY(linear_av);
    items = AvFILLp(linear_av) + 1;

    while (items--) {
        linear_sv = *linear_svp++;
        assert(linear_sv);
        if(sv_eq(linear_sv, stashname))
            break;
    }

    if(items > 0) {
        SV* sub_sv = sv_2mortal(newSVpv(subname, subname_len));
        HV* cc3_mro = get_hv("Class::C3::MRO", 0);

        while (items--) {
            linear_sv = *linear_svp++;
            assert(linear_sv);

            if(cc3_mro) {
                HE* he_cc3_mro_class = hv_fetch_ent(cc3_mro, linear_sv, 0, 0);
                if(he_cc3_mro_class) {
                    HV* cc3_mro_class = (HV*)SvRV(HeVAL(he_cc3_mro_class));
                    SV** svp_cc3_mro_class_methods = hv_fetch(cc3_mro_class, "methods", 7, 0);
                    if(svp_cc3_mro_class_methods) {
                        HV* cc3_mro_class_methods = (HV*)SvRV(*svp_cc3_mro_class_methods);
                        if(hv_exists_ent(cc3_mro_class_methods, sub_sv, 0))
                            continue;
                    }
                }
            }

            cstash = gv_stashsv(linear_sv, FALSE);

            if (!cstash) {
                if (ckWARN(WARN_MISC))
                    Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
                        (void*)linear_sv, hvname);
                continue;
            }

            assert(cstash);

            gvp = (GV**)hv_fetch(cstash, subname, subname_len, 0);
            if (!gvp) continue;

            candidate = *gvp;
            assert(candidate);

            if (SvTYPE(candidate) != SVt_PVGV)
                gv_init(candidate, cstash, subname, subname_len, TRUE);
            if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
                SvREFCNT_inc((SV*)cand_cv);
                hv_store_ent(nmcache, newSVsv(cachekey), (SV*)cand_cv, 0);
                return (SV*)cand_cv;
            }
        }
    }

    hv_store_ent(nmcache, newSVsv(cachekey), &PL_sv_undef, 0);
    if(throw_nomethod)
        croak("No next::method '%s' found for %s", subname, hvname);
    return &PL_sv_undef;
}

XS(XS_Class_C3_XS_calculateMRO);
XS(XS_Class_C3_XS_calculateMRO)
{
#ifdef dVAR
    dVAR; dXSARGS;
#else
    dXSARGS;
#endif

    SV* classname;
    HV* class_stash;
    HV* cache = NULL;
    AV* res;
    I32 res_items;
    I32 ret_items;
    SV** res_ptr;

    if(items < 1 || items > 2)
        croak("Usage: calculateMRO(classname[, cache])");

    classname = ST(0);
    if(items == 2) cache = (HV*)SvRV(ST(1));

    class_stash = gv_stashsv(classname, 0);
    if(!class_stash) croak("No such class: '%s'!", SvPV_nolen(classname));

    res = (AV*)sv_2mortal((SV*)__mro_linear_isa_c3(aTHX_ class_stash, cache, 0));

    res_items = ret_items = AvFILLp(res) + 1;
    res_ptr = AvARRAY(res);

    SP -= items;

    while(res_items--) {
        SV* res_item = *res_ptr++;
        XPUSHs(res_item);
    }

    PUTBACK;

    return;
}

XS(XS_next_can);
XS(XS_next_can)
{
#ifdef dVAR
    dVAR; dXSARGS;
#else
    dXSARGS;
#endif

    SV* self = ST(0);
    SV* methcv = __nextcan(aTHX_ self, 0);

    PERL_UNUSED_VAR(items);

    if(methcv == &PL_sv_undef) {
        ST(0) = &PL_sv_undef;
    }
    else {
        ST(0) = sv_2mortal(newRV_inc(methcv));
    }

    XSRETURN(1);
}

XS(XS_next_method);
XS(XS_next_method)
{
    dMARK;
    dAX;
    SV* self = ST(0);
    SV* methcv = __nextcan(aTHX_ self, 1);

    PL_markstack_ptr++;
    call_sv(methcv, GIMME_V);
}

XS(XS_maybe_next_method);
XS(XS_maybe_next_method)
{
    dMARK;
    dAX;
    SV* self = ST(0);
    SV* methcv = __nextcan(aTHX_ self, 0);

    if(methcv == &PL_sv_undef) {
        ST(0) = &PL_sv_undef;
        XSRETURN(1);
    }

    PL_markstack_ptr++;
    call_sv(methcv, GIMME_V);
}

MODULE = Class::C3::XS	PACKAGE = Class::C3::XS

BOOT:
    newXS("Class::C3::XS::calculateMRO", XS_Class_C3_XS_calculateMRO, __FILE__);
    newXS("next::can", XS_next_can, __FILE__);
    newXS("next::method", XS_next_method, __FILE__);
    newXS("maybe::next::method", XS_maybe_next_method, __FILE__);
Commit	Line	Data
8995e827	1
	2	#include "EXTERN.h"
	3	#include "perl.h"
	4	#include "XSUB.h"
8995e827	5
29e61e10	6	/* Most of this code is backported from the bleadperl patch's
b23e9cb9	7	mro.c, and then modified to work with Class::C3's
	8	internals.
	9	*/
8995e827	10
b23e9cb9	11	AV*
	12	__mro_linear_isa_c3(pTHX_ HV* stash, HV* cache, I32 level)
	13	{
	14	AV* retval;
	15	GV** gvp;
	16	GV* gv;
	17	AV* isa;
	18	const char* stashname;
	19	STRLEN stashname_len;
8995e827	20
b23e9cb9	21	assert(stash);
b23e9cb9	22	assert(HvAUX(stash));
8995e827	23
b23e9cb9	24	stashname = HvNAME(stash);
	25	stashname_len = strlen(stashname);
	26	if (!stashname)
	27	Perl_croak(aTHX_
	28	"Can't linearize anonymous symbol table");
8995e827	29
b23e9cb9	30	if (level > 100)
	31	Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
	32	stashname);
8995e827	33
b23e9cb9	34	if(!cache) {
f0294f1b	35	cache = (HV)sv_2mortal((SV)newHV());
b23e9cb9	36	}
b23e9cb9	37	else {
6bf46d18	38	SV** cache_entry = hv_fetch(cache, stashname, stashname_len, 0);
	39	if(cache_entry)
	40	return (AV)SvREFCNT_inc(cache_entry);
b23e9cb9	41	}
	42
	43	/* not in cache, make a new one */
	44
	45	retval = (AV)sv_2mortal((SV)newAV());
	46	av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */
	47
	48	gvp = (GV**)hv_fetch(stash, "ISA", 3, FALSE);
	49	isa = (gvp && (gv = gvp) && gv != (GV)&PL_sv_undef) ? GvAV(gv) : NULL;
	50
	51	if(isa && AvFILLp(isa) >= 0) {
	52	SV** seqs_ptr;
	53	I32 seqs_items;
	54	HV* tails = (HV)sv_2mortal((SV)newHV());
	55	AV* seqs = (AV)sv_2mortal((SV)newAV());
	56	I32 items = AvFILLp(isa) + 1;
	57	SV** isa_ptr = AvARRAY(isa);
	58	while(items--) {
	59	AV* isa_lin;
	60	SV* isa_item = *isa_ptr++;
	61	HV* isa_item_stash = gv_stashsv(isa_item, 0);
	62	if(!isa_item_stash) {
	63	isa_lin = newAV();
	64	av_push(isa_lin, newSVsv(isa_item));
	65	}
	66	else {
b36f79e1	67	isa_lin = (AV)sv_2mortal((SV)__mro_linear_isa_c3(aTHX_ isa_item_stash, cache, level + 1)); /* recursion */
b23e9cb9	68	}
	69	av_push(seqs, (SV*)av_make(AvFILLp(isa_lin)+1, AvARRAY(isa_lin)));
	70	}
	71	av_push(seqs, (SV*)av_make(AvFILLp(isa)+1, AvARRAY(isa)));
	72
	73	seqs_ptr = AvARRAY(seqs);
	74	seqs_items = AvFILLp(seqs) + 1;
	75	while(seqs_items--) {
	76	AV* seq = (AV)seqs_ptr++;
	77	I32 seq_items = AvFILLp(seq);
	78	if(seq_items > 0) {
	79	SV** seq_ptr = AvARRAY(seq) + 1;
	80	while(seq_items--) {
	81	SV* seqitem = *seq_ptr++;
	82	HE* he = hv_fetch_ent(tails, seqitem, 0, 0);
	83	if(!he) {
	84	hv_store_ent(tails, seqitem, newSViv(1), 0);
	85	}
	86	else {
	87	SV* val = HeVAL(he);
	88	sv_inc(val);
	89	}
	90	}
	91	}
	92	}
	93
	94	while(1) {
	95	SV* seqhead = NULL;
	96	SV* cand = NULL;
	97	SV* winner = NULL;
	98	SV* val;
	99	HE* tail_entry;
	100	AV* seq;
	101	SV** avptr = AvARRAY(seqs);
	102	items = AvFILLp(seqs)+1;
	103	while(items--) {
	104	SV** svp;
	105	seq = (AV)avptr++;
	106	if(AvFILLp(seq) < 0) continue;
	107	svp = av_fetch(seq, 0, 0);
	108	seqhead = *svp;
	109	if(!winner) {
	110	cand = seqhead;
	111	if((tail_entry = hv_fetch_ent(tails, cand, 0, 0))
	112	&& (val = HeVAL(tail_entry))
	113	&& (SvIVx(val) > 0))
	114	continue;
	115	winner = newSVsv(cand);
	116	av_push(retval, winner);
	117	}
	118	if(!sv_cmp(seqhead, winner)) {
b34605d0	119	sv_2mortal(av_shift(seq));
b23e9cb9	120	if(AvFILLp(seq) < 0) continue;
	121	svp = av_fetch(seq, 0, 0);
	122	seqhead = *svp;
	123	tail_entry = hv_fetch_ent(tails, seqhead, 0, 0);
	124	val = HeVAL(tail_entry);
	125	sv_dec(val);
	126	}
	127	}
	128	if(!cand) break;
	129	if(!winner)
	130	Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': "
	131	"merging failed on parent '%s'", stashname, SvPV_nolen(cand));
	132	}
	133	}
	134
	135	SvREADONLY_on(retval);
	136	SvREFCNT_inc(retval); /* for cache storage */
6bf46d18	137	SvREFCNT_inc(retval); /* for return */
f0294f1b	138	hv_store(cache, stashname, stashname_len, (SV*)retval, 0);
b23e9cb9	139	return retval;
	140	}
	141
	142	STATIC I32
	143	__dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) {
	144	I32 i;
	145	for (i = startingblock; i >= 0; i--) {
	146	if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i;
	147	}
	148	return i;
	149	}
	150
	151	STATIC SV*
	152	__nextcan(pTHX_ SV* self, I32 throw_nomethod)
	153	{
	154	register I32 cxix;
	155	register const PERL_CONTEXT *ccstack = cxstack;
	156	const PERL_SI *top_si = PL_curstackinfo;
	157	HV* selfstash;
	158	GV* cvgv;
	159	SV *stashname;
	160	const char *fq_subname;
	161	const char *subname;
	162	STRLEN fq_subname_len;
	163	STRLEN stashname_len;
	164	STRLEN subname_len;
	165	SV* sv;
	166	GV** gvp;
	167	AV* linear_av;
	168	SV** linear_svp;
	169	SV* linear_sv;
	170	HV* cstash;
	171	GV* candidate = NULL;
	172	CV* cand_cv = NULL;
	173	const char *hvname;
	174	I32 items;
6c88cc6a	175	HV* nmcache;
b23e9cb9	176	HE* cache_entry;
22c6f594	177	SV* cachekey;
b23e9cb9	178
	179	if(sv_isobject(self))
	180	selfstash = SvSTASH(SvRV(self));
	181	else
	182	selfstash = gv_stashsv(self, 0);
	183
	184	assert(selfstash);
	185
	186	hvname = HvNAME(selfstash);
	187	if (!hvname)
	188	croak("Can't use anonymous symbol table for method lookup");
	189
	190	cxix = __dopoptosub_at(cxstack, cxstack_ix);
	191
	192	/* This block finds the contextually-enclosing fully-qualified subname,
	193	much like looking at (caller($i))[3] until you find a real sub that
	194	isn't ANON, etc */
	195	for (;;) {
	196	/* we may be in a higher stacklevel, so dig down deeper */
	197	while (cxix < 0) {
	198	if(top_si->si_type == PERLSI_MAIN)
	199	croak("next::method/next::can/maybe::next::method must be used in method context");
	200	top_si = top_si->si_prev;
	201	ccstack = top_si->si_cxstack;
	202	cxix = __dopoptosub_at(ccstack, top_si->si_cxix);
	203	}
	204
	205	if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB
	206	\|\| (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) {
	207	cxix = __dopoptosub_at(ccstack, cxix - 1);
	208	continue;
	209	}
	210
	211	{
	212	const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1);
	213	if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) {
	214	if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) {
	215	cxix = dbcxix;
	216	continue;
	217	}
	218	}
	219	}
	220
	221	cvgv = CvGV(ccstack[cxix].blk_sub.cv);
	222
	223	if(!isGV(cvgv)) {
	224	cxix = __dopoptosub_at(ccstack, cxix - 1);
	225	continue;
	226	}
	227
	228	/* we found a real sub here */
	229	sv = sv_2mortal(newSV(0));
	230
	231	gv_efullname3(sv, cvgv, NULL);
	232
	233	fq_subname = SvPVX(sv);
	234	fq_subname_len = SvCUR(sv);
	235
	236	subname = strrchr(fq_subname, ':');
	237	if(!subname)
	238	croak("next::method/next::can/maybe::next::method cannot find enclosing method");
	239
	240	subname++;
	241	subname_len = fq_subname_len - (subname - fq_subname);
242	if(subname_len == 8 && strEQ(subname, "__ANON__")) {
243	cxix = __dopoptosub_at(ccstack, cxix - 1);
244	continue;
245	}
246	break;
247	}
248
249	/* If we made it to here, we found our context */
250
22c6f594	251	/* cachekey = "objpkg\|context::method::name" */
	252	cachekey = sv_2mortal(newSVpv(hvname, 0));
	253	sv_catpvn(cachekey, "\|", 1);
	254	sv_catsv(cachekey, sv);
b23e9cb9	255
6c88cc6a	256	nmcache = get_hv("next::METHOD_CACHE", 1);
22c6f594	257	if((cache_entry = hv_fetch_ent(nmcache, cachekey, 0, 0))) {
b23e9cb9	258	SV* val = HeVAL(cache_entry);
	259	if(val == &PL_sv_undef) {
	260	if(throw_nomethod)
	261	croak("No next::method '%s' found for %s", subname, hvname);
	262	return &PL_sv_undef;
	263	}
	264	return SvREFCNT_inc(val);
	265	}
b23e9cb9	266
	267	/* beyond here is just for cache misses, so perf isn't as critical */
	268
	269	stashname_len = subname - fq_subname - 2;
	270	stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len));
	271
b36f79e1	272	linear_av = (AV)sv_2mortal((SV)__mro_linear_isa_c3(aTHX_ selfstash, NULL, 0));
b23e9cb9	273
	274	linear_svp = AvARRAY(linear_av);
	275	items = AvFILLp(linear_av) + 1;
	276
	277	while (items--) {
	278	linear_sv = *linear_svp++;
	279	assert(linear_sv);
	280	if(sv_eq(linear_sv, stashname))
	281	break;
	282	}
	283
	284	if(items > 0) {
29e61e10	285	SV* sub_sv = sv_2mortal(newSVpv(subname, subname_len));
29e61e10	286	HV* cc3_mro = get_hv("Class::C3::MRO", 0);
29e61e10	287
b23e9cb9	288	while (items--) {
	289	linear_sv = *linear_svp++;
	290	assert(linear_sv);
29e61e10	291
	292	if(cc3_mro) {
	293	HE* he_cc3_mro_class = hv_fetch_ent(cc3_mro, linear_sv, 0, 0);
	294	if(he_cc3_mro_class) {
efafd620	295	HV* cc3_mro_class = (HV*)SvRV(HeVAL(he_cc3_mro_class));
	296	SV** svp_cc3_mro_class_methods = hv_fetch(cc3_mro_class, "methods", 7, 0);
	297	if(svp_cc3_mro_class_methods) {
	298	HV* cc3_mro_class_methods = (HV)SvRV(svp_cc3_mro_class_methods);
29e61e10	299	if(hv_exists_ent(cc3_mro_class_methods, sub_sv, 0))
	300	continue;
	301	}
	302	}
	303	}
	304
b23e9cb9	305	cstash = gv_stashsv(linear_sv, FALSE);
	306
	307	if (!cstash) {
	308	if (ckWARN(WARN_MISC))
	309	Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
	310	(void*)linear_sv, hvname);
	311	continue;
	312	}
	313
	314	assert(cstash);
	315
b23e9cb9	316	gvp = (GV**)hv_fetch(cstash, subname, subname_len, 0);
	317	if (!gvp) continue;
	318
	319	candidate = *gvp;
	320	assert(candidate);
	321
	322	if (SvTYPE(candidate) != SVt_PVGV)
	323	gv_init(candidate, cstash, subname, subname_len, TRUE);
	324	if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
	325	SvREFCNT_inc((SV*)cand_cv);
22c6f594	326	hv_store_ent(nmcache, newSVsv(cachekey), (SV*)cand_cv, 0);
b23e9cb9	327	return (SV*)cand_cv;
	328	}
	329	}
	330	}
	331
22c6f594	332	hv_store_ent(nmcache, newSVsv(cachekey), &PL_sv_undef, 0);
b23e9cb9	333	if(throw_nomethod)
	334	croak("No next::method '%s' found for %s", subname, hvname);
	335	return &PL_sv_undef;
	336	}
	337
	338	XS(XS_Class_C3_XS_calculateMRO);
	339	XS(XS_Class_C3_XS_calculateMRO)
	340	{
	341	#ifdef dVAR
	342	dVAR; dXSARGS;
	343	#else
	344	dXSARGS;
	345	#endif
	346
	347	SV* classname;
	348	HV* class_stash;
	349	HV* cache = NULL;
	350	AV* res;
	351	I32 res_items;
	352	I32 ret_items;
	353	SV** res_ptr;
	354
	355	if(items < 1 \|\| items > 2)
	356	croak("Usage: calculateMRO(classname[, cache])");
	357
	358	classname = ST(0);
f0294f1b	359	if(items == 2) cache = (HV*)SvRV(ST(1));
b23e9cb9	360
	361	class_stash = gv_stashsv(classname, 0);
	362	if(!class_stash) croak("No such class: '%s'!", SvPV_nolen(classname));
	363
b36f79e1	364	res = (AV)sv_2mortal((SV)__mro_linear_isa_c3(aTHX_ class_stash, cache, 0));
b23e9cb9	365
b23e9cb9	366	res_items = ret_items = AvFILLp(res) + 1;
	367	res_ptr = AvARRAY(res);
	368
	369	SP -= items;
	370
	371	while(res_items--) {
	372	SV* res_item = *res_ptr++;
	373	XPUSHs(res_item);
	374	}
	375
	376	PUTBACK;
	377
	378	return;
	379	}
	380
	381	XS(XS_next_can);
	382	XS(XS_next_can)
	383	{
	384	#ifdef dVAR
	385	dVAR; dXSARGS;
	386	#else
	387	dXSARGS;
	388	#endif
	389
	390	SV* self = ST(0);
b36f79e1	391	SV* methcv = __nextcan(aTHX_ self, 0);
b23e9cb9	392
	393	PERL_UNUSED_VAR(items);
	394
	395	if(methcv == &PL_sv_undef) {
	396	ST(0) = &PL_sv_undef;
	397	}
	398	else {
	399	ST(0) = sv_2mortal(newRV_inc(methcv));
	400	}
	401
	402	XSRETURN(1);
	403	}
	404
	405	XS(XS_next_method);
	406	XS(XS_next_method)
	407	{
	408	dMARK;
	409	dAX;
	410	SV* self = ST(0);
b36f79e1	411	SV* methcv = __nextcan(aTHX_ self, 1);
b23e9cb9	412
	413	PL_markstack_ptr++;
	414	call_sv(methcv, GIMME_V);
	415	}
	416
	417	XS(XS_maybe_next_method);
	418	XS(XS_maybe_next_method)
	419	{
	420	dMARK;
	421	dAX;
	422	SV* self = ST(0);
b36f79e1	423	SV* methcv = __nextcan(aTHX_ self, 0);
b23e9cb9	424
	425	if(methcv == &PL_sv_undef) {
	426	ST(0) = &PL_sv_undef;
	427	XSRETURN(1);
	428	}
	429
	430	PL_markstack_ptr++;
	431	call_sv(methcv, GIMME_V);
	432	}
	433
	434	MODULE = Class::C3::XS PACKAGE = Class::C3::XS
	435
	436	BOOT:
	437	newXS("Class::C3::XS::calculateMRO", XS_Class_C3_XS_calculateMRO, __FILE__);
	438	newXS("next::can", XS_next_can, __FILE__);
	439	newXS("next::method", XS_next_method, __FILE__);
	440	newXS("maybe::next::method", XS_maybe_next_method, __FILE__);