/*
 * This file was generated automatically by ExtUtils::ParseXS version 3.40 from the
 * contents of mro.xs. Do not edit this file, edit mro.xs instead.
 *
 *    ANY CHANGES MADE HERE WILL BE LOST!
 *
 */

#line 1 "mro.xs"
#define PERL_NO_GET_CONTEXT

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

static AV*
S_mro_get_linear_isa_c3(pTHX_ HV* stash, U32 level);

static const struct mro_alg c3_alg =
    {S_mro_get_linear_isa_c3, "c3", 2, 0, 0};

/*
#if 0
  "Skipped embedded POD."
#endif
#line 28 "mro.xs"
*/

static AV*
S_mro_get_linear_isa_c3(pTHX_ HV* stash, U32 level)
{
    AV* retval;
    GV** gvp;
    GV* gv;
    AV* isa;
    const HEK* stashhek;
    struct mro_meta* meta;

    assert(HvAUX(stash));

    stashhek = HvENAME_HEK(stash);
    if (!stashhek) stashhek = HvNAME_HEK(stash);
    if (!stashhek)
      Perl_croak(aTHX_ "Can't linearize anonymous symbol table");

    if (level > 100)
        Perl_croak(aTHX_ "Recursive inheritance detected in package '%" HEKf
                         "'",
                          HEKfARG(stashhek));

    meta = HvMROMETA(stash);

    /* return cache if valid */
    if((retval = MUTABLE_AV(MRO_GET_PRIVATE_DATA(meta, &c3_alg)))) {
        return retval;
    }

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

    gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
    isa = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL;

    /* For a better idea how the rest of this works, see the much clearer
       pure perl version in Algorithm::C3 0.01:
       http://search.cpan.org/src/STEVAN/Algorithm-C3-0.01/lib/Algorithm/C3.pm
       (later versions go about it differently than this code for speed reasons)
    */

    if(isa && AvFILLp(isa) >= 0) {
        SV** seqs_ptr;
        I32 seqs_items;
        HV *tails;
        AV *const seqs = MUTABLE_AV(sv_2mortal(MUTABLE_SV(newAV())));
        I32* heads;

        /* This builds @seqs, which is an array of arrays.
           The members of @seqs are the MROs of
           the members of @ISA, followed by @ISA itself.
        */
        SSize_t items = AvFILLp(isa) + 1;
        SV** isa_ptr = AvARRAY(isa);
        while(items--) {
            SV* const isa_item = *isa_ptr ? *isa_ptr : &PL_sv_undef;
            HV* const isa_item_stash = gv_stashsv(isa_item, 0);
            isa_ptr++;
            if(!isa_item_stash) {
                /* if no stash, make a temporary fake MRO
                   containing just itself */
                AV* const isa_lin = newAV();
                av_push(isa_lin, newSVsv(isa_item));
                av_push(seqs, MUTABLE_SV(isa_lin));
            }
            else {
                /* recursion */
                AV* const isa_lin
		  = S_mro_get_linear_isa_c3(aTHX_ isa_item_stash, level + 1);

		if(items == 0 && AvFILLp(seqs) == -1) {
		    /* Only one parent class. For this case, the C3
		       linearisation is this class followed by the parent's
		       linearisation, so don't bother with the expensive
		       calculation.  */
		    SV **svp;
		    I32 subrv_items = AvFILLp(isa_lin) + 1;
		    SV *const *subrv_p = AvARRAY(isa_lin);

		    /* Hijack the allocated but unused array seqs to be the
		       return value. It's currently mortalised.  */

		    retval = seqs;

		    av_extend(retval, subrv_items);
		    AvFILLp(retval) = subrv_items;
		    svp = AvARRAY(retval);

		    /* First entry is this class.  We happen to make a shared
		       hash key scalar because it's the cheapest and fastest
		       way to do it.  */
		    *svp++ = newSVhek(stashhek);

		    while(subrv_items--) {
			/* These values are unlikely to be shared hash key
			   scalars, so no point in adding code to optimising
			   for a case that is unlikely to be true.
			   (Or prove me wrong and do it.)  */

			SV *const val = *subrv_p++;
			*svp++ = newSVsv(val);
		    }

		    SvREFCNT_inc(retval);

		    goto done;
		}
                av_push(seqs, SvREFCNT_inc_simple_NN(MUTABLE_SV(isa_lin)));
            }
        }
        av_push(seqs, SvREFCNT_inc_simple_NN(MUTABLE_SV(isa)));
	tails = MUTABLE_HV(sv_2mortal(MUTABLE_SV(newHV())));

        /* This builds "heads", which as an array of integer array
           indices, one per seq, which point at the virtual "head"
           of the seq (initially zero) */
        Newxz(heads, AvFILLp(seqs)+1, I32);

        /* This builds %tails, which has one key for every class
           mentioned in the tail of any sequence in @seqs (tail meaning
           everything after the first class, the "head").  The value
           is how many times this key appears in the tails of @seqs.
        */
        seqs_ptr = AvARRAY(seqs);
        seqs_items = AvFILLp(seqs) + 1;
        while(seqs_items--) {
            AV *const seq = MUTABLE_AV(*seqs_ptr++);
            I32 seq_items = AvFILLp(seq);
            if(seq_items > 0) {
                SV** seq_ptr = AvARRAY(seq) + 1;
                while(seq_items--) {
                    SV* const seqitem = *seq_ptr++;
		    /* LVALUE fetch will create a new undefined SV if necessary
		     */
                    HE* const he = hv_fetch_ent(tails, seqitem, 1, 0);
                    if(he) {
                        SV* const val = HeVAL(he);
                        /* For 5.8.0 and later, sv_inc() with increment undef to
			   an IV of 1, which is what we want for a newly created
			   entry.  However, for 5.6.x it will become an NV of
			   1.0, which confuses the SvIVX() checks above.  */
			if(SvIOK(val)) {
			    SvIV_set(val, SvIVX(val) + 1);
			} else {
			    sv_setiv(val, 1);
			}
                    }
                }
            }
        }

        /* Initialize retval to build the return value in */
        retval = newAV();
        av_push(retval, newSVhek(stashhek)); /* us first */

        /* This loop won't terminate until we either finish building
           the MRO, or get an exception. */
        while(1) {
            SV* cand = NULL;
            SV* winner = NULL;
            int s;

            /* "foreach $seq (@seqs)" */
            SV** const avptr = AvARRAY(seqs);
            for(s = 0; s <= AvFILLp(seqs); s++) {
                SV** svp;
                AV * const seq = MUTABLE_AV(avptr[s]);
		SV* seqhead;
                if(!seq) continue; /* skip empty seqs */
                svp = av_fetch(seq, heads[s], 0);
                seqhead = *svp; /* seqhead = head of this seq */
                if(!winner) {
		    HE* tail_entry;
		    SV* val;
                    /* if we haven't found a winner for this round yet,
                       and this seqhead is not in tails (or the count
                       for it in tails has dropped to zero), then this
                       seqhead is our new winner, and is added to the
                       final MRO immediately */
                    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);
                    /* note however that even when we find a winner,
                       we continue looping over @seqs to do housekeeping */
                }
                if(!sv_cmp(seqhead, winner)) {
                    /* Once we have a winner (including the iteration
                       where we first found him), inc the head ptr
                       for any seq which had the winner as a head,
                       NULL out any seq which is now empty,
                       and adjust tails for consistency */

                    const int new_head = ++heads[s];
                    if(new_head > AvFILLp(seq)) {
                        SvREFCNT_dec(avptr[s]);
                        avptr[s] = NULL;
                    }
                    else {
			HE* tail_entry;
			SV* val;
                        /* Because we know this new seqhead used to be
                           a tail, we can assume it is in tails and has
                           a positive value, which we need to dec */
                        svp = av_fetch(seq, new_head, 0);
                        seqhead = *svp;
                        tail_entry = hv_fetch_ent(tails, seqhead, 0, 0);
                        val = HeVAL(tail_entry);
                        sv_dec(val);
                    }
                }
            }

            /* if we found no candidates, we are done building the MRO.
               !cand means no seqs have any entries left to check */
            if(!cand) {
                Safefree(heads);
                break;
            }

            /* If we had candidates, but nobody won, then the @ISA
               hierarchy is not C3-incompatible */
            if(!winner) {
                SV *errmsg;
                I32 i;

                errmsg = newSVpvf(
                           "Inconsistent hierarchy during C3 merge of class '%" HEKf "':\n\t"
                            "current merge results [\n",
                            HEKfARG(stashhek));
                for (i = 0; i <= av_tindex(retval); i++) {
                    SV **elem = av_fetch(retval, i, 0);
                    sv_catpvf(errmsg, "\t\t%" SVf ",\n", SVfARG(*elem));
                }
                sv_catpvf(errmsg, "\t]\n\tmerging failed on '%" SVf "'", SVfARG(cand));

                /* we have to do some cleanup before we croak */

                SvREFCNT_dec(retval);
                Safefree(heads);

                Perl_croak(aTHX_ "%" SVf, SVfARG(errmsg));
            }
        }
    }
    else { /* @ISA was undefined or empty */
        /* build a retval containing only ourselves */
        retval = newAV();
        av_push(retval, newSVhek(stashhek));
    }

 done:
    /* we don't want anyone modifying the cache entry but us,
       and we do so by replacing it completely */
    SvREADONLY_on(retval);

    return MUTABLE_AV(Perl_mro_set_private_data(aTHX_ meta, &c3_alg,
						MUTABLE_SV(retval)));
}


/* These two are static helpers for next::method and friends,
   and re-implement a bunch of the code from pp_caller() in
   a more efficient manner for this particular usage.
*/

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;
}

#line 307 "mro.c"
#ifndef PERL_UNUSED_VAR
#  define PERL_UNUSED_VAR(var) if (0) var = var
#endif

#ifndef dVAR
#  define dVAR		dNOOP
#endif


/* This stuff is not part of the API! You have been warned. */
#ifndef PERL_VERSION_DECIMAL
#  define PERL_VERSION_DECIMAL(r,v,s) (r*1000000 + v*1000 + s)
#endif
#ifndef PERL_DECIMAL_VERSION
#  define PERL_DECIMAL_VERSION \
	  PERL_VERSION_DECIMAL(PERL_REVISION,PERL_VERSION,PERL_SUBVERSION)
#endif
#ifndef PERL_VERSION_GE
#  define PERL_VERSION_GE(r,v,s) \
	  (PERL_DECIMAL_VERSION >= PERL_VERSION_DECIMAL(r,v,s))
#endif
#ifndef PERL_VERSION_LE
#  define PERL_VERSION_LE(r,v,s) \
	  (PERL_DECIMAL_VERSION <= PERL_VERSION_DECIMAL(r,v,s))
#endif

/* XS_INTERNAL is the explicit static-linkage variant of the default
 * XS macro.
 *
 * XS_EXTERNAL is the same as XS_INTERNAL except it does not include
 * "STATIC", ie. it exports XSUB symbols. You probably don't want that
 * for anything but the BOOT XSUB.
 *
 * See XSUB.h in core!
 */


/* TODO: This might be compatible further back than 5.10.0. */
#if PERL_VERSION_GE(5, 10, 0) && PERL_VERSION_LE(5, 15, 1)
#  undef XS_EXTERNAL
#  undef XS_INTERNAL
#  if defined(__CYGWIN__) && defined(USE_DYNAMIC_LOADING)
#    define XS_EXTERNAL(name) __declspec(dllexport) XSPROTO(name)
#    define XS_INTERNAL(name) STATIC XSPROTO(name)
#  endif
#  if defined(__SYMBIAN32__)
#    define XS_EXTERNAL(name) EXPORT_C XSPROTO(name)
#    define XS_INTERNAL(name) EXPORT_C STATIC XSPROTO(name)
#  endif
#  ifndef XS_EXTERNAL
#    if defined(HASATTRIBUTE_UNUSED) && !defined(__cplusplus)
#      define XS_EXTERNAL(name) void name(pTHX_ CV* cv __attribute__unused__)
#      define XS_INTERNAL(name) STATIC void name(pTHX_ CV* cv __attribute__unused__)
#    else
#      ifdef __cplusplus
#        define XS_EXTERNAL(name) extern "C" XSPROTO(name)
#        define XS_INTERNAL(name) static XSPROTO(name)
#      else
#        define XS_EXTERNAL(name) XSPROTO(name)
#        define XS_INTERNAL(name) STATIC XSPROTO(name)
#      endif
#    endif
#  endif
#endif

/* perl >= 5.10.0 && perl <= 5.15.1 */


/* The XS_EXTERNAL macro is used for functions that must not be static
 * like the boot XSUB of a module. If perl didn't have an XS_EXTERNAL
 * macro defined, the best we can do is assume XS is the same.
 * Dito for XS_INTERNAL.
 */
#ifndef XS_EXTERNAL
#  define XS_EXTERNAL(name) XS(name)
#endif
#ifndef XS_INTERNAL
#  define XS_INTERNAL(name) XS(name)
#endif

/* Now, finally, after all this mess, we want an ExtUtils::ParseXS
 * internal macro that we're free to redefine for varying linkage due
 * to the EXPORT_XSUB_SYMBOLS XS keyword. This is internal, use
 * XS_EXTERNAL(name) or XS_INTERNAL(name) in your code if you need to!
 */

#undef XS_EUPXS
#if defined(PERL_EUPXS_ALWAYS_EXPORT)
#  define XS_EUPXS(name) XS_EXTERNAL(name)
#else
   /* default to internal */
#  define XS_EUPXS(name) XS_INTERNAL(name)
#endif

#ifndef PERL_ARGS_ASSERT_CROAK_XS_USAGE
#define PERL_ARGS_ASSERT_CROAK_XS_USAGE assert(cv); assert(params)

/* prototype to pass -Wmissing-prototypes */
STATIC void
S_croak_xs_usage(const CV *const cv, const char *const params);

STATIC void
S_croak_xs_usage(const CV *const cv, const char *const params)
{
    const GV *const gv = CvGV(cv);

    PERL_ARGS_ASSERT_CROAK_XS_USAGE;

    if (gv) {
        const char *const gvname = GvNAME(gv);
        const HV *const stash = GvSTASH(gv);
        const char *const hvname = stash ? HvNAME(stash) : NULL;

        if (hvname)
	    Perl_croak_nocontext("Usage: %s::%s(%s)", hvname, gvname, params);
        else
	    Perl_croak_nocontext("Usage: %s(%s)", gvname, params);
    } else {
        /* Pants. I don't think that it should be possible to get here. */
	Perl_croak_nocontext("Usage: CODE(0x%" UVxf ")(%s)", PTR2UV(cv), params);
    }
}
#undef  PERL_ARGS_ASSERT_CROAK_XS_USAGE

#define croak_xs_usage        S_croak_xs_usage

#endif

/* NOTE: the prototype of newXSproto() is different in versions of perls,
 * so we define a portable version of newXSproto()
 */
#ifdef newXS_flags
#define newXSproto_portable(name, c_impl, file, proto) newXS_flags(name, c_impl, file, proto, 0)
#else
#define newXSproto_portable(name, c_impl, file, proto) (PL_Sv=(SV*)newXS(name, c_impl, file), sv_setpv(PL_Sv, proto), (CV*)PL_Sv)
#endif /* !defined(newXS_flags) */

#if PERL_VERSION_LE(5, 21, 5)
#  define newXS_deffile(a,b) Perl_newXS(aTHX_ a,b,file)
#else
#  define newXS_deffile(a,b) Perl_newXS_deffile(aTHX_ a,b)
#endif

#line 451 "mro.c"

XS_EUPXS(XS_mro_get_linear_isa); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro_get_linear_isa)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 313 "mro.xs"
    AV* RETVAL;
    HV* class_stash;
    SV* classname;
#line 466 "mro.c"
#line 317 "mro.xs"
    if(items < 1 || items > 2)
	croak_xs_usage(cv, "classname [, type ]");

    classname = ST(0);
    class_stash = gv_stashsv(classname, 0);

    if(!class_stash) {
        /* No stash exists yet, give them just the classname */
        AV* isalin = newAV();
        av_push(isalin, newSVsv(classname));
        ST(0) = sv_2mortal(newRV_noinc(MUTABLE_SV(isalin)));
        XSRETURN(1);
    }
    else if(items > 1) {
	const struct mro_alg *const algo = Perl_mro_get_from_name(aTHX_ ST(1));
	if (!algo)
	    Perl_croak(aTHX_ "Invalid mro name: '%" SVf "'", ST(1));
	RETVAL = algo->resolve(aTHX_ class_stash, 0);
    }
    else {
        RETVAL = mro_get_linear_isa(class_stash);
    }
    ST(0) = newRV_inc(MUTABLE_SV(RETVAL));
    sv_2mortal(ST(0));
    XSRETURN(1);
#line 493 "mro.c"
	PUTBACK;
	return;
    }
}


XS_EUPXS(XS_mro_set_mro); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro_set_mro)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 347 "mro.xs"
    SV* classname;
    HV* class_stash;
    struct mro_meta* meta;
#line 513 "mro.c"
#line 351 "mro.xs"
    if (items != 2)
	croak_xs_usage(cv, "classname, type");

    classname = ST(0);
    class_stash = gv_stashsv(classname, GV_ADD);
    if(!class_stash) Perl_croak(aTHX_ "Cannot create class: '%" SVf "'!", SVfARG(classname));
    meta = HvMROMETA(class_stash);

    Perl_mro_set_mro(aTHX_ meta, ST(1));

    XSRETURN_EMPTY;
#line 526 "mro.c"
	PUTBACK;
	return;
    }
}


XS_EUPXS(XS_mro_get_mro); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro_get_mro)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 367 "mro.xs"
    SV* classname;
    HV* class_stash;
#line 545 "mro.c"
#line 370 "mro.xs"
    if (items != 1)
	croak_xs_usage(cv, "classname");

    classname = ST(0);
    class_stash = gv_stashsv(classname, 0);

    if (class_stash) {
        const struct mro_alg *const meta = HvMROMETA(class_stash)->mro_which;
 	ST(0) = newSVpvn_flags(meta->name, meta->length,
			       SVs_TEMP
			       | ((meta->kflags & HVhek_UTF8) ? SVf_UTF8 : 0));
    } else {
      ST(0) = newSVpvn_flags("dfs", 3, SVs_TEMP);
    }
    XSRETURN(1);
#line 562 "mro.c"
	PUTBACK;
	return;
    }
}


XS_EUPXS(XS_mro_get_isarev); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro_get_isarev)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 390 "mro.xs"
    SV* classname;
    HE* he;
    HV* isarev;
    AV* ret_array;
#line 583 "mro.c"
#line 395 "mro.xs"
    if (items != 1)
	croak_xs_usage(cv, "classname");

    classname = ST(0);

    he = hv_fetch_ent(PL_isarev, classname, 0, 0);
    isarev = he ? MUTABLE_HV(HeVAL(he)) : NULL;

    ret_array = newAV();
    if(isarev) {
        HE* iter;
        hv_iterinit(isarev);
        while((iter = hv_iternext(isarev)))
            av_push(ret_array, newSVsv(hv_iterkeysv(iter)));
    }
    mXPUSHs(newRV_noinc(MUTABLE_SV(ret_array)));

    PUTBACK;
#line 603 "mro.c"
	PUTBACK;
	return;
    }
}


XS_EUPXS(XS_mro_is_universal); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro_is_universal)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 418 "mro.xs"
    SV* classname;
    HV* isarev;
    char* classname_pv;
    STRLEN classname_len;
    HE* he;
#line 625 "mro.c"
#line 424 "mro.xs"
    if (items != 1)
	croak_xs_usage(cv, "classname");

    classname = ST(0);

    classname_pv = SvPV(classname,classname_len);

    he = hv_fetch_ent(PL_isarev, classname, 0, 0);
    isarev = he ? MUTABLE_HV(HeVAL(he)) : NULL;

    if((memEQs(classname_pv, classname_len, "UNIVERSAL"))
        || (isarev && hv_existss(isarev, "UNIVERSAL")))
        XSRETURN_YES;
    else
        XSRETURN_NO;
#line 642 "mro.c"
	PUTBACK;
	return;
    }
}


XS_EUPXS(XS_mro_invalidate_all_method_caches); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro_invalidate_all_method_caches)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 445 "mro.xs"
    if (items != 0)
	croak_xs_usage(cv, "");

    PL_sub_generation++;

    XSRETURN_EMPTY;
#line 665 "mro.c"
	PUTBACK;
	return;
    }
}


XS_EUPXS(XS_mro_get_pkg_gen); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro_get_pkg_gen)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 456 "mro.xs"
    SV* classname;
    HV* class_stash;
#line 684 "mro.c"
#line 459 "mro.xs"
    if(items != 1)
	croak_xs_usage(cv, "classname");

    classname = ST(0);

    class_stash = gv_stashsv(classname, 0);

    mXPUSHi(class_stash ? HvMROMETA(class_stash)->pkg_gen : 0);

    PUTBACK;
#line 696 "mro.c"
	PUTBACK;
	return;
    }
}


XS_EUPXS(XS_mro__nextcan); /* prototype to pass -Wmissing-prototypes */
XS_EUPXS(XS_mro__nextcan)
{
    dVAR; dXSARGS;
    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
    PERL_UNUSED_VAR(ax); /* -Wall */
    SP -= items;
    {
#line 473 "mro.xs"
    SV* self = ST(0);
    const I32 throw_nomethod = SvIVX(ST(1));
    I32 cxix = cxstack_ix;
    const PERL_CONTEXT *ccstack = cxstack;
    const PERL_SI *top_si = PL_curstackinfo;
    HV* selfstash;
    SV *stashname;
    const char *fq_subname = NULL;
    const char *subname = NULL;
    bool subname_utf8 = 0;
    STRLEN stashname_len;
    STRLEN subname_len;
    SV* sv;
    GV** gvp;
    AV* linear_av;
    SV** linear_svp;
    const char *hvname;
    I32 entries;
    struct mro_meta* selfmeta;
    HV* nmcache;
    I32 i;
#line 734 "mro.c"
#line 495 "mro.xs"
    PERL_UNUSED_ARG(cv);

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

    assert(selfstash);

    hvname = HvNAME_get(selfstash);
    if (!hvname)
        Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");

    /* 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 (also skips over pureperl next::method, etc) */
    for(i = 0; i < 2; i++) {
        cxix = __dopoptosub_at(ccstack, cxix);
        for (;;) {
	    GV* cvgv;
	    STRLEN fq_subname_len;

            /* we may be in a higher stacklevel, so dig down deeper */
            while (cxix < 0) {
                if(top_si->si_type == PERLSI_MAIN)
                    Perl_croak(aTHX_ "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_newmortal();

            gv_efullname3(sv, cvgv, NULL);

	    if(SvPOK(sv)) {
		fq_subname = SvPVX(sv);
		fq_subname_len = SvCUR(sv);

                subname_utf8 = SvUTF8(sv) ? 1 : 0;
		subname = strrchr(fq_subname, ':');
	    } else {
		subname = NULL;
	    }

            if(!subname)
                Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method");

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

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

    /* Initialize the next::method cache for this stash
       if necessary */
    selfmeta = HvMROMETA(selfstash);
    if(!(nmcache = selfmeta->mro_nextmethod)) {
        nmcache = selfmeta->mro_nextmethod = newHV();
    }
    else { /* Use the cached coderef if it exists */
	HE* cache_entry = hv_fetch_ent(nmcache, sv, 0, 0);
	if (cache_entry) {
	    SV* const val = HeVAL(cache_entry);
	    if(val == &PL_sv_undef) {
		if(throw_nomethod)
		    Perl_croak(aTHX_
                       "No next::method '%" SVf "' found for %" HEKf,
                        SVfARG(newSVpvn_flags(subname, subname_len,
                                SVs_TEMP | ( subname_utf8 ? SVf_UTF8 : 0 ) )),
                        HEKfARG( HvNAME_HEK(selfstash) ));
                XSRETURN_EMPTY;
	    }
	    mXPUSHs(newRV_inc(val));
            XSRETURN(1);
	}
    }

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

    stashname_len = subname - fq_subname - 2;
    stashname = newSVpvn_flags(fq_subname, stashname_len,
                                SVs_TEMP | (subname_utf8 ? SVf_UTF8 : 0));

    /* has ourselves at the top of the list */
    linear_av = S_mro_get_linear_isa_c3(aTHX_ selfstash, 0);

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

    /* Walk down our MRO, skipping everything up
       to the contextually enclosing class */
    while (entries--) {
        SV * const linear_sv = *linear_svp++;
        assert(linear_sv);
        if(sv_eq(linear_sv, stashname))
            break;
    }

    /* Now search the remainder of the MRO for the
       same method name as the contextually enclosing
       method */
    if(entries > 0) {
        while (entries--) {
            SV * const linear_sv = *linear_svp++;
	    HV* curstash;
	    GV* candidate;
	    CV* cand_cv;

            assert(linear_sv);
            curstash = gv_stashsv(linear_sv, FALSE);

            if (!curstash) {
                if (ckWARN(WARN_SYNTAX))
                    Perl_warner(aTHX_ packWARN(WARN_SYNTAX),
                       "Can't locate package %" SVf " for @%" HEKf "::ISA",
                        (void*)linear_sv,
                        HEKfARG( HvNAME_HEK(selfstash) ));
                continue;
            }

            assert(curstash);

            gvp = (GV**)hv_fetch(curstash, subname,
                                    subname_utf8 ? -(I32)subname_len : (I32)subname_len, 0);
            if (!gvp) continue;

            candidate = *gvp;
            assert(candidate);

            if (SvTYPE(candidate) != SVt_PVGV)
                gv_init_pvn(candidate, curstash, subname, subname_len,
                                GV_ADDMULTI|(subname_utf8 ? SVf_UTF8 : 0));

            /* Notably, we only look for real entries, not method cache
               entries, because in C3 the method cache of a parent is not
               valid for the child */
            if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
                SvREFCNT_inc_simple_void_NN(MUTABLE_SV(cand_cv));
                (void)hv_store_ent(nmcache, sv, MUTABLE_SV(cand_cv), 0);
                mXPUSHs(newRV_inc(MUTABLE_SV(cand_cv)));
                XSRETURN(1);
            }
        }
    }

    (void)hv_store_ent(nmcache, sv, &PL_sv_undef, 0);
    if(throw_nomethod)
        Perl_croak(aTHX_ "No next::method '%" SVf "' found for %" HEKf,
                         SVfARG(newSVpvn_flags(subname, subname_len,
                                SVs_TEMP | ( subname_utf8 ? SVf_UTF8 : 0 ) )),
                        HEKfARG( HvNAME_HEK(selfstash) ));
    XSRETURN_EMPTY;
#line 920 "mro.c"
	PUTBACK;
	return;
    }
}

#ifdef __cplusplus
extern "C"
#endif
XS_EXTERNAL(boot_mro); /* prototype to pass -Wmissing-prototypes */
XS_EXTERNAL(boot_mro)
{
#if PERL_VERSION_LE(5, 21, 5)
    dVAR; dXSARGS;
#else
    dVAR; dXSBOOTARGSXSAPIVERCHK;
#endif
#if (PERL_REVISION == 5 && PERL_VERSION < 9)
    char* file = __FILE__;
#else
    const char* file = __FILE__;
#endif

    PERL_UNUSED_VAR(file);

    PERL_UNUSED_VAR(cv); /* -W */
    PERL_UNUSED_VAR(items); /* -W */
#if PERL_VERSION_LE(5, 21, 5)
    XS_VERSION_BOOTCHECK;
#  ifdef XS_APIVERSION_BOOTCHECK
    XS_APIVERSION_BOOTCHECK;
#  endif
#endif

        (void)newXSproto_portable("mro::get_linear_isa", XS_mro_get_linear_isa, file, "$;$");
        (void)newXSproto_portable("mro::set_mro", XS_mro_set_mro, file, "$$");
        (void)newXSproto_portable("mro::get_mro", XS_mro_get_mro, file, "$");
        (void)newXSproto_portable("mro::get_isarev", XS_mro_get_isarev, file, "$");
        (void)newXSproto_portable("mro::is_universal", XS_mro_is_universal, file, "$");
        (void)newXSproto_portable("mro::invalidate_all_method_caches", XS_mro_invalidate_all_method_caches, file, "");
        (void)newXSproto_portable("mro::get_pkg_gen", XS_mro_get_pkg_gen, file, "$");
        newXS_deffile("mro::_nextcan", XS_mro__nextcan);

    /* Initialisation Section */

#line 681 "mro.xs"
    Perl_mro_register(aTHX_ &c3_alg);

#line 968 "mro.c"

    /* End of Initialisation Section */

#if PERL_VERSION_LE(5, 21, 5)
#  if PERL_VERSION_GE(5, 9, 0)
    if (PL_unitcheckav)
        call_list(PL_scopestack_ix, PL_unitcheckav);
#  endif
    XSRETURN_YES;
#else
    Perl_xs_boot_epilog(aTHX_ ax);
#endif
}

