[gitmo/Class-MOP.git] / MOP.xs

/* There's a lot of cases of doubled parens in here like this:

  while ( (he = ...) ) {

This shuts up warnings from gcc -Wall
*/

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

#define NEED_newRV_noinc
#define NEED_sv_2pv_flags
#define NEED_sv_2pv_nolen
#include "ppport.h"

#define DECLARE_KEY(name) SV *key_##name; U32 hash_##name;

#define PREHASH_KEY_WITH_VALUE(name, value) do { \
    key_##name = newSVpvs(value); \
    PERL_HASH(hash_##name, value, sizeof(value) - 1); \
} while (0)

/* this is basically the same as the above macro, except that the value will be
 * the stringified name. However, we can't just implement this in terms of
 * PREHASH_KEY_WITH_VALUE as that'd cause macro expansion on the value of
 * 'name' when it's being passed to the other macro. suggestions on how to make
 * this more elegant would be much appreciated */

#define PREHASH_KEY(name) do { \
    key_##name = newSVpvs(#name); \
    PERL_HASH(hash_##name, #name, sizeof(#name) - 1); \
} while (0)

DECLARE_KEY(name);
DECLARE_KEY(package);
DECLARE_KEY(package_name);
DECLARE_KEY(body);
DECLARE_KEY(package_cache_flag);
DECLARE_KEY(methods);
DECLARE_KEY(VERSION);
DECLARE_KEY(ISA);

SV *method_metaclass;
SV *associated_metaclass;
SV *wrap;


#define check_package_cache_flag(stash) mop_check_package_cache_flag(aTHX_ stash)
#if PERL_VERSION >= 10

static UV
mop_check_package_cache_flag(pTHX_ HV* stash) {
    assert(SvTYPE(stash) == SVt_PVHV);

    /* here we're trying to implement a c version of mro::get_pkg_gen($stash),
     * however the perl core doesn't make it easy for us. It doesn't provide an
     * api that just does what we want.
     *
     * However, we know that the information we want is, inside the core,
     * available using HvMROMETA(stash)->pkg_gen. Unfortunately, although the
     * HvMROMETA macro is public, it is implemented using Perl_mro_meta_init,
     * which is not public and only available inside the core, as the mro
     * interface as well as the structure returned by mro_meta_init isn't
     * considered to be stable yet.
     *
     * Perl_mro_meta_init isn't declared static, so we could just define it
     * ourselfs if perls headers don't do that for us, except that won't work
     * on platforms where symbols need to be explicitly exported when linking
     * shared libraries.
     *
     * So our, hopefully temporary, solution is to be even more evil and
     * basically reimplement HvMROMETA in a very fragile way that'll blow up
     * when the relevant parts of the mro implementation in core change.
     *
     * :-(
     *
     */

    return HvAUX(stash)->xhv_mro_meta
         ? HvAUX(stash)->xhv_mro_meta->pkg_gen
         : 0;
}

#else /* pre 5.10.0 */

static UV
mop_check_package_cache_flag(pTHX_ HV *stash) {
    PERL_UNUSED_ARG(stash);
    assert(SvTYPE(stash) == SVt_PVHV);

    return PL_sub_generation;
}
#endif

#define call0(s, m)  mop_call0(aTHX_ s, m)
static SV *
mop_call0(pTHX_ SV *const self, SV *const method) {
    dSP;
    SV *ret;

    PUSHMARK(SP);
    XPUSHs(self);
    PUTBACK;

    call_sv(method, G_SCALAR | G_METHOD);

    SPAGAIN;
    ret = POPs;
    PUTBACK;

    return ret;
}

static int
get_code_info (SV *coderef, char **pkg, char **name)
{
    if (!SvOK(coderef) || !SvROK(coderef) || SvTYPE(SvRV(coderef)) != SVt_PVCV) {
        return 0;
    }

    coderef = SvRV(coderef);
    /* I think this only gets triggered with a mangled coderef, but if
       we hit it without the guard, we segfault. The slightly odd return
       value strikes me as an improvement (mst)
    */
#ifdef isGV_with_GP
    if ( isGV_with_GP(CvGV(coderef)) ) {
#endif
        *pkg     = HvNAME( GvSTASH(CvGV(coderef)) );
        *name    = GvNAME( CvGV(coderef) );
#ifdef isGV_with_GP
    } else {
        *pkg     = "__UNKNOWN__";
        *name    = "__ANON__";
    }
#endif

    return 1;
}

typedef enum {
    TYPE_FILTER_NONE,
    TYPE_FILTER_CODE,
    TYPE_FILTER_ARRAY,
    TYPE_FILTER_IO,
    TYPE_FILTER_HASH,
    TYPE_FILTER_SCALAR,
} type_filter_t;

static HV *
get_all_package_symbols(HV *stash, type_filter_t filter)
{
    HE *he;
    HV *ret = newHV();

    (void)hv_iterinit(stash);

    if (filter == TYPE_FILTER_NONE) {
        while ( (he = hv_iternext(stash)) ) {
            STRLEN keylen;
            char *key = HePV(he, keylen);
            if (!hv_store(ret, key, keylen, SvREFCNT_inc(HeVAL(he)), 0)) {
                croak("failed to store glob ref");
            }
        }

        return ret;
    }

    while ( (he = hv_iternext(stash)) ) {
        SV *const gv = HeVAL(he);
        SV *sv = NULL;
        char *key;
        STRLEN keylen;
        char *package;
        SV *fq;

        switch( SvTYPE(gv) ) {
#ifndef SVt_RV
            case SVt_RV:
#endif
            case SVt_PV:
            case SVt_IV:
                /* expand the gv into a real typeglob if it
                 * contains stub functions and we were asked to
                 * return CODE symbols */
                if (filter == TYPE_FILTER_CODE) {
                    if (SvROK(gv)) {
                        /* we don't really care about the length,
                           but that's the API */
                        key = HePV(he, keylen);
                        package = HvNAME(stash);
                        fq = newSVpvf("%s::%s", package, key);
                        sv = (SV *)get_cv(SvPV_nolen(fq), 0);
                        break;
                    }

                    key = HePV(he, keylen);
                    gv_init((GV *)gv, stash, key, keylen, GV_ADDMULTI);
                }
                /* fall through */
            case SVt_PVGV:
                switch (filter) {
                    case TYPE_FILTER_CODE:   sv = (SV *)GvCVu(gv); break;
                    case TYPE_FILTER_ARRAY:  sv = (SV *)GvAV(gv);  break;
                    case TYPE_FILTER_IO:     sv = (SV *)GvIO(gv);  break;
                    case TYPE_FILTER_HASH:   sv = (SV *)GvHV(gv);  break;
                    case TYPE_FILTER_SCALAR: sv = (SV *)GvSV(gv);  break;
                    default:
                        croak("Unknown type");
                }
                break;
            default:
                continue;
        }

        if (sv) {
            char *key = HePV(he, keylen);
            if (!hv_store(ret, key, keylen, newRV_inc(sv), 0)) {
                croak("failed to store symbol ref");
            }
        }
    }

    return ret;
}


static void
mop_update_method_map(pTHX_ SV *const self, SV *const class_name, HV *const stash, HV *const map) {
    const char *const class_name_pv = HvNAME(stash); /* must be HvNAME(stash), not SvPV_nolen_const(class_name) */
    SV   *method_metaclass_name;
    char *method_name;
    I32   method_name_len;
    SV   *coderef;
    HV   *symbols;
    dSP;

    symbols = get_all_package_symbols(stash, TYPE_FILTER_CODE);

    (void)hv_iterinit(symbols);
    while ( (coderef = hv_iternextsv(symbols, &method_name, &method_name_len)) ) {
        CV *cv = (CV *)SvRV(coderef);
        char *cvpkg_name;
        char *cv_name;
        SV *method_slot;
        SV *method_object;

        if (!get_code_info(coderef, &cvpkg_name, &cv_name)) {
            continue;
        }

        /* this checks to see that the subroutine is actually from our package  */
        if ( !(strEQ(cvpkg_name, "constant") && strEQ(cv_name, "__ANON__")) ) {
            if ( strNE(cvpkg_name, class_name_pv) ) {
                continue;
            }
        }

        method_slot = *hv_fetch(map, method_name, method_name_len, TRUE);
        if ( SvOK(method_slot) ) {
            SV *const body = call0(method_slot, key_body); /* $method_object->body() */
            if ( SvROK(body) && ((CV *) SvRV(body)) == cv ) {
                continue;
            }
        }

        method_metaclass_name = call0(self, method_metaclass); /* $self->method_metaclass() */

        /*
            $method_object = $method_metaclass->wrap(
                $cv,
                associated_metaclass => $self,
                package_name         => $class_name,
                name                 => $method_name
            );
        */
        ENTER;
        SAVETMPS;

        PUSHMARK(SP);
        EXTEND(SP, 8);
        PUSHs(method_metaclass_name); /* invocant */
        mPUSHs(newRV_inc((SV *)cv));
        PUSHs(associated_metaclass);
        PUSHs(self);
        PUSHs(key_package_name);
        PUSHs(class_name);
        PUSHs(key_name);
        mPUSHs(newSVpv(method_name, method_name_len));
        PUTBACK;

        call_sv(wrap, G_SCALAR | G_METHOD);
        SPAGAIN;
        method_object = POPs;
        PUTBACK;
        /* $map->{$method_name} = $method_object */
        sv_setsv(method_slot, method_object);

        FREETMPS;
        LEAVE;
    }
}

/*
get_code_info:
  Pass in a coderef, returns:
  [ $pkg_name, $coderef_name ] ie:
  [ 'Foo::Bar', 'new' ]
*/

MODULE = Class::MOP   PACKAGE = Class::MOP

BOOT:
    PREHASH_KEY(name);
    PREHASH_KEY(body);
    PREHASH_KEY(package);
    PREHASH_KEY(package_name);
    PREHASH_KEY(methods);
    PREHASH_KEY(ISA);
    PREHASH_KEY(VERSION);
    PREHASH_KEY_WITH_VALUE(package_cache_flag, "_package_cache_flag");

    method_metaclass     = newSVpvs("method_metaclass");
    wrap                 = newSVpvs("wrap");
    associated_metaclass = newSVpvs("associated_metaclass");


PROTOTYPES: DISABLE

# use prototype here to be compatible with get_code_info from Sub::Identify
void
get_code_info(coderef)
    SV *coderef
    PROTOTYPE: $
    PREINIT:
        char *pkg  = NULL;
        char *name = NULL;
    PPCODE:
        if (get_code_info(coderef, &pkg, &name)) {
            EXTEND(SP, 2);
            PUSHs(newSVpv(pkg, 0));
            PUSHs(newSVpv(name, 0));
        }

# This is some pretty grotty logic. It _should_ be parallel to the
# pure Perl version in lib/Class/MOP.pm, so if you want to understand
# it we suggest you start there.
void
is_class_loaded(klass=&PL_sv_undef)
    SV *klass
    PREINIT:
        HV *stash;
        char *key;
        I32 keylen;
        SV *gv;
    PPCODE:
        if (!SvPOK(klass) || !SvCUR(klass)) {
            XSRETURN_NO;
        }

        stash = gv_stashsv(klass, 0);
        if (!stash) {
            XSRETURN_NO;
        }

        if (hv_exists_ent (stash, key_VERSION, hash_VERSION)) {
            HE *version = hv_fetch_ent(stash, key_VERSION, 0, hash_VERSION);
            SV *version_sv;
            if (version && HeVAL(version) && (version_sv = GvSV(HeVAL(version)))) {
                if (SvROK(version_sv)) {
                    SV *version_sv_ref = SvRV(version_sv);

                    if (SvOK(version_sv_ref)) {
                        XSRETURN_YES;
                    }
                }
                else if (SvOK(version_sv)) {
                    XSRETURN_YES;
                }
            }
        }

        if (hv_exists_ent (stash, key_ISA, hash_ISA)) {
            HE *isa = hv_fetch_ent(stash, key_ISA, 0, hash_ISA);
            if (isa && HeVAL(isa) && GvAV(HeVAL(isa))) {
                XSRETURN_YES;
            }
        }

        (void)hv_iterinit(stash);
        while ((gv = hv_iternextsv(stash, &key, &keylen))) {
            if (keylen <= 0) {
                continue;
            }

            if (key[keylen - 1] == ':' && key[keylen - 2] == ':') {
                continue;
            }

            if (!isGV(gv) || GvCV(gv)) {
                XSRETURN_YES;
            }
        }

        XSRETURN_NO;

MODULE = Class::MOP   PACKAGE = Class::MOP::Package

void
get_all_package_symbols(self, filter=TYPE_FILTER_NONE)
    SV *self
    type_filter_t filter
    PREINIT:
        HV *stash = NULL;
        HV *symbols = NULL;
        register HE *he;
    PPCODE:
        if ( ! SvROK(self) ) {
            die("Cannot call get_all_package_symbols as a class method");
        }

        if (GIMME_V == G_VOID) {
            XSRETURN_EMPTY;
        }

        PUTBACK;

        if ( (he = hv_fetch_ent((HV *)SvRV(self), key_package, 0, hash_package)) ) {
            stash = gv_stashsv(HeVAL(he), 0);
        }


        if (!stash) {
            XSRETURN_UNDEF;
        }

        symbols = get_all_package_symbols(stash, filter);
        PUSHs(sv_2mortal(newRV_noinc((SV *)symbols)));

void
name(self)
    SV *self
    PREINIT:
        register HE *he;
    PPCODE:
        if ( ! SvROK(self) ) {
            die("Cannot call name as a class method");
        }

        if ( (he = hv_fetch_ent((HV *)SvRV(self), key_package, 0, hash_package)) )
            XPUSHs(HeVAL(he));
        else
            ST(0) = &PL_sv_undef;

MODULE = Class::MOP   PACKAGE = Class::MOP::Attribute

void
name(self)
    SV *self
    PREINIT:
        register HE *he;
    PPCODE:
        if ( ! SvROK(self) ) {
            die("Cannot call name as a class method");
        }

        if ( (he = hv_fetch_ent((HV *)SvRV(self), key_name, 0, hash_name)) )
            XPUSHs(HeVAL(he));
        else
            ST(0) = &PL_sv_undef;

MODULE = Class::MOP   PACKAGE = Class::MOP::Method

void
name(self)
    SV *self
    PREINIT:
        register HE *he;
    PPCODE:
        if ( ! SvROK(self) ) {
            die("Cannot call name as a class method");
        }

        if ( (he = hv_fetch_ent((HV *)SvRV(self), key_name, 0, hash_name)) )
            XPUSHs(HeVAL(he));
        else
            ST(0) = &PL_sv_undef;

void
package_name(self)
    SV *self
    PREINIT:
        register HE *he;
    PPCODE:
        if ( ! SvROK(self) ) {
            die("Cannot call package_name as a class method");
        }

        if ( (he = hv_fetch_ent((HV *)SvRV(self), key_package_name, 0, hash_package_name)) )
            XPUSHs(HeVAL(he));
        else
            ST(0) = &PL_sv_undef;

void
body(self)
    SV *self
    PREINIT:
        register HE *he;
    PPCODE:
        if ( ! SvROK(self) ) {
            die("Cannot call body as a class method");
        }

        if ( (he = hv_fetch_ent((HV *)SvRV(self), key_body, 0, hash_body)) )
            XPUSHs(HeVAL(he));
        else
            ST(0) = &PL_sv_undef;


MODULE = Class::MOP    PACKAGE = Class::MOP::Class

void
get_method_map(self)
    SV *self
    PREINIT:
        HV *const obj        = (HV *)SvRV(self);
        SV *const class_name = HeVAL( hv_fetch_ent(obj, key_package, 0, hash_package) );
        HV *const stash      = gv_stashsv(class_name, 0);
        UV  const current    = check_package_cache_flag(stash);
        SV *const cache_flag = HeVAL( hv_fetch_ent(obj, key_package_cache_flag, TRUE, hash_package_cache_flag));
        SV *const map_ref    = HeVAL( hv_fetch_ent(obj, key_methods, TRUE, hash_methods));
    PPCODE:
        /* in  $self->{methods} does not yet exist (or got deleted) */
        if ( !SvROK(map_ref) || SvTYPE(SvRV(map_ref)) != SVt_PVHV ) {
            SV *new_map_ref = newRV_noinc((SV *)newHV());
            sv_2mortal(new_map_ref);
            sv_setsv(map_ref, new_map_ref);
        }

        if ( !SvOK(cache_flag) || SvUV(cache_flag) != current ) {
            mop_update_method_map(aTHX_ self, class_name, stash, (HV *)SvRV(map_ref));
            sv_setuv(cache_flag, check_package_cache_flag(stash)); /* update_cache_flag() */
        }

        XPUSHs(map_ref);
Commit	Line	Data
e7b69038	1	/* There's a lot of cases of doubled parens in here like this:
	2
	3	while ( (he = ...) ) {
	4
	5	This shuts up warnings from gcc -Wall
	6	*/
	7
e0e4674a	8	#include "EXTERN.h"
	9	#include "perl.h"
	10	#include "XSUB.h"
15273f3c	11
08f4716f	12	#define NEED_newRV_noinc
599791aa	13	#define NEED_sv_2pv_flags
15273f3c	14	#define NEED_sv_2pv_nolen
b0e94057	15	#include "ppport.h"
e0e4674a	16
193bfdc0	17	#define DECLARE_KEY(name) SV *key_##name; U32 hash_##name;
193bfdc0	18
1654881c	19	#define PREHASH_KEY_WITH_VALUE(name, value) do { \
193bfdc0	20	key_##name = newSVpvs(value); \
	21	PERL_HASH(hash_##name, value, sizeof(value) - 1); \
	22	} while (0)
	23
45a46f7b	24	/* this is basically the same as the above macro, except that the value will be
	25	* the stringified name. However, we can't just implement this in terms of
	26	* PREHASH_KEY_WITH_VALUE as that'd cause macro expansion on the value of
	27	* 'name' when it's being passed to the other macro. suggestions on how to make
	28	* this more elegant would be much appreciated */
	29
	30	#define PREHASH_KEY(name) do { \
	31	key_##name = newSVpvs(#name); \
	32	PERL_HASH(hash_##name, #name, sizeof(#name) - 1); \
	33	} while (0)
1654881c	34
193bfdc0	35	DECLARE_KEY(name);
	36	DECLARE_KEY(package);
	37	DECLARE_KEY(package_name);
	38	DECLARE_KEY(body);
	39	DECLARE_KEY(package_cache_flag);
	40	DECLARE_KEY(methods);
	41	DECLARE_KEY(VERSION);
	42	DECLARE_KEY(ISA);
d508fabd	43
00c93f7a	44	SV *method_metaclass;
	45	SV *associated_metaclass;
	46	SV *wrap;
c94afdc4	47
	48
	49	#define check_package_cache_flag(stash) mop_check_package_cache_flag(aTHX_ stash)
1d4cf2a9	50	#if PERL_VERSION >= 10
c94afdc4	51
	52	static UV
	53	mop_check_package_cache_flag(pTHX_ HV* stash) {
	54	assert(SvTYPE(stash) == SVt_PVHV);
	55
1d4cf2a9	56	/* here we're trying to implement a c version of mro::get_pkg_gen($stash),
	57	* however the perl core doesn't make it easy for us. It doesn't provide an
	58	* api that just does what we want.
	59	*
	60	* However, we know that the information we want is, inside the core,
	61	* available using HvMROMETA(stash)->pkg_gen. Unfortunately, although the
	62	* HvMROMETA macro is public, it is implemented using Perl_mro_meta_init,
	63	* which is not public and only available inside the core, as the mro
	64	* interface as well as the structure returned by mro_meta_init isn't
	65	* considered to be stable yet.
	66	*
	67	* Perl_mro_meta_init isn't declared static, so we could just define it
	68	* ourselfs if perls headers don't do that for us, except that won't work
	69	* on platforms where symbols need to be explicitly exported when linking
	70	* shared libraries.
	71	*
	72	* So our, hopefully temporary, solution is to be even more evil and
	73	* basically reimplement HvMROMETA in a very fragile way that'll blow up
	74	* when the relevant parts of the mro implementation in core change.
	75	*
	76	* :-(
	77	*
	78	*/
	79
	80	return HvAUX(stash)->xhv_mro_meta
	81	? HvAUX(stash)->xhv_mro_meta->pkg_gen
	82	: 0;
c94afdc4	83	}
	84
	85	#else /* pre 5.10.0 */
	86
	87	static UV
00c93f7a	88	mop_check_package_cache_flag(pTHX_ HV *stash) {
c94afdc4	89	PERL_UNUSED_ARG(stash);
	90	assert(SvTYPE(stash) == SVt_PVHV);
	91
	92	return PL_sub_generation;
	93	}
	94	#endif
	95
	96	#define call0(s, m) mop_call0(aTHX_ s, m)
00c93f7a	97	static SV *
00c93f7a	98	mop_call0(pTHX_ SV const self, SV const method) {
c94afdc4	99	dSP;
00c93f7a	100	SV *ret;
c94afdc4	101
	102	PUSHMARK(SP);
	103	XPUSHs(self);
	104	PUTBACK;
	105
	106	call_sv(method, G_SCALAR \| G_METHOD);
	107
	108	SPAGAIN;
	109	ret = POPs;
	110	PUTBACK;
	111
	112	return ret;
	113	}
	114
ee82a43e	115	static int
0e0b5b8d	116	get_code_info (SV coderef, char pkg, char *name)
	117	{
	118	if (!SvOK(coderef) \|\| !SvROK(coderef) \|\| SvTYPE(SvRV(coderef)) != SVt_PVCV) {
	119	return 0;
	120	}
6bd19edb	121
0e0b5b8d	122	coderef = SvRV(coderef);
	123	/* I think this only gets triggered with a mangled coderef, but if
	124	we hit it without the guard, we segfault. The slightly odd return
	125	value strikes me as an improvement (mst)
	126	*/
	127	#ifdef isGV_with_GP
	128	if ( isGV_with_GP(CvGV(coderef)) ) {
cb0ec494	129	#endif
0e0b5b8d	130	*pkg = HvNAME( GvSTASH(CvGV(coderef)) );
	131	*name = GvNAME( CvGV(coderef) );
	132	#ifdef isGV_with_GP
	133	} else {
	134	*pkg = "__UNKNOWN__";
	135	*name = "__ANON__";
c94afdc4	136	}
0e0b5b8d	137	#endif
	138
	139	return 1;
c94afdc4	140	}
c94afdc4	141
b49ee39f	142	typedef enum {
	143	TYPE_FILTER_NONE,
	144	TYPE_FILTER_CODE,
	145	TYPE_FILTER_ARRAY,
	146	TYPE_FILTER_IO,
	147	TYPE_FILTER_HASH,
	148	TYPE_FILTER_SCALAR,
	149	} type_filter_t;
	150
	151	static HV *
	152	get_all_package_symbols(HV *stash, type_filter_t filter)
	153	{
	154	HE *he;
	155	HV *ret = newHV();
	156
	157	(void)hv_iterinit(stash);
	158
	159	if (filter == TYPE_FILTER_NONE) {
	160	while ( (he = hv_iternext(stash)) ) {
	161	STRLEN keylen;
	162	char *key = HePV(he, keylen);
7291ecef	163	if (!hv_store(ret, key, keylen, SvREFCNT_inc(HeVAL(he)), 0)) {
	164	croak("failed to store glob ref");
	165	}
b49ee39f	166	}
	167
	168	return ret;
	169	}
	170
	171	while ( (he = hv_iternext(stash)) ) {
	172	SV *const gv = HeVAL(he);
	173	SV *sv = NULL;
	174	char *key;
	175	STRLEN keylen;
	176	char *package;
	177	SV *fq;
	178
	179	switch( SvTYPE(gv) ) {
	180	#ifndef SVt_RV
	181	case SVt_RV:
	182	#endif
	183	case SVt_PV:
	184	case SVt_IV:
	185	/* expand the gv into a real typeglob if it
	186	* contains stub functions and we were asked to
	187	* return CODE symbols */
	188	if (filter == TYPE_FILTER_CODE) {
	189	if (SvROK(gv)) {
	190	/* we don't really care about the length,
	191	but that's the API */
	192	key = HePV(he, keylen);
	193	package = HvNAME(stash);
	194	fq = newSVpvf("%s::%s", package, key);
	195	sv = (SV *)get_cv(SvPV_nolen(fq), 0);
	196	break;
	197	}
	198
	199	key = HePV(he, keylen);
	200	gv_init((GV *)gv, stash, key, keylen, GV_ADDMULTI);
	201	}
	202	/* fall through */
	203	case SVt_PVGV:
	204	switch (filter) {
	205	case TYPE_FILTER_CODE: sv = (SV *)GvCVu(gv); break;
	206	case TYPE_FILTER_ARRAY: sv = (SV *)GvAV(gv); break;
	207	case TYPE_FILTER_IO: sv = (SV *)GvIO(gv); break;
	208	case TYPE_FILTER_HASH: sv = (SV *)GvHV(gv); break;
	209	case TYPE_FILTER_SCALAR: sv = (SV *)GvSV(gv); break;
	210	default:
	211	croak("Unknown type");
	212	}
	213	break;
	214	default:
	215	continue;
	216	}
	217
	218	if (sv) {
	219	char *key = HePV(he, keylen);
7291ecef	220	if (!hv_store(ret, key, keylen, newRV_inc(sv), 0)) {
	221	croak("failed to store symbol ref");
	222	}
b49ee39f	223	}
	224	}
	225
	226	return ret;
	227	}
c94afdc4	228
0e0b5b8d	229
0e0b5b8d	230	static void
00c93f7a	231	mop_update_method_map(pTHX_ SV const self, SV const class_name, HV const stash, HV const map) {
	232	const char const class_name_pv = HvNAME(stash); / must be HvNAME(stash), not SvPV_nolen_const(class_name) */
	233	SV *method_metaclass_name;
	234	char *method_name;
0e0b5b8d	235	I32 method_name_len;
00c93f7a	236	SV *coderef;
00c93f7a	237	HV *symbols;
0e0b5b8d	238	dSP;
	239
	240	symbols = get_all_package_symbols(stash, TYPE_FILTER_CODE);
	241
	242	(void)hv_iterinit(symbols);
	243	while ( (coderef = hv_iternextsv(symbols, &method_name, &method_name_len)) ) {
00c93f7a	244	CV cv = (CV )SvRV(coderef);
	245	char *cvpkg_name;
	246	char *cv_name;
	247	SV *method_slot;
	248	SV *method_object;
0e0b5b8d	249
	250	if (!get_code_info(coderef, &cvpkg_name, &cv_name)) {
	251	continue;
	252	}
	253
	254	/* this checks to see that the subroutine is actually from our package */
	255	if ( !(strEQ(cvpkg_name, "constant") && strEQ(cv_name, "__ANON__")) ) {
	256	if ( strNE(cvpkg_name, class_name_pv) ) {
	257	continue;
	258	}
	259	}
	260
	261	method_slot = *hv_fetch(map, method_name, method_name_len, TRUE);
	262	if ( SvOK(method_slot) ) {
6d915932	263	SV const body = call0(method_slot, key_body); / $method_object->body() */
00c93f7a	264	if ( SvROK(body) && ((CV *) SvRV(body)) == cv ) {
0e0b5b8d	265	continue;
	266	}
	267	}
	268
	269	method_metaclass_name = call0(self, method_metaclass); /* $self->method_metaclass() */
	270
	271	/*
	272	$method_object = $method_metaclass->wrap(
	273	$cv,
	274	associated_metaclass => $self,
	275	package_name => $class_name,
	276	name => $method_name
	277	);
	278	*/
	279	ENTER;
	280	SAVETMPS;
	281
	282	PUSHMARK(SP);
	283	EXTEND(SP, 8);
	284	PUSHs(method_metaclass_name); /* invocant */
00c93f7a	285	mPUSHs(newRV_inc((SV *)cv));
0e0b5b8d	286	PUSHs(associated_metaclass);
	287	PUSHs(self);
	288	PUSHs(key_package_name);
	289	PUSHs(class_name);
	290	PUSHs(key_name);
	291	mPUSHs(newSVpv(method_name, method_name_len));
	292	PUTBACK;
	293
	294	call_sv(wrap, G_SCALAR \| G_METHOD);
	295	SPAGAIN;
	296	method_object = POPs;
	297	PUTBACK;
	298	/* $map->{$method_name} = $method_object */
	299	sv_setsv(method_slot, method_object);
	300
	301	FREETMPS;
	302	LEAVE;
	303	}
	304	}
	305
e0e4674a	306	/*
e0e4674a	307	get_code_info:
	308	Pass in a coderef, returns:
	309	[ $pkg_name, $coderef_name ] ie:
	310	[ 'Foo::Bar', 'new' ]
	311	*/
	312
	313	MODULE = Class::MOP PACKAGE = Class::MOP
	314
cc856b56	315	BOOT:
1654881c	316	PREHASH_KEY(name);
	317	PREHASH_KEY(body);
	318	PREHASH_KEY(package);
	319	PREHASH_KEY(package_name);
	320	PREHASH_KEY(methods);
	321	PREHASH_KEY(ISA);
45a46f7b	322	PREHASH_KEY(VERSION);
1654881c	323	PREHASH_KEY_WITH_VALUE(package_cache_flag, "_package_cache_flag");
cc856b56	324
c94afdc4	325	method_metaclass = newSVpvs("method_metaclass");
	326	wrap = newSVpvs("wrap");
	327	associated_metaclass = newSVpvs("associated_metaclass");
	328
cc856b56	329
36756faf	330	PROTOTYPES: DISABLE
cc856b56	331
36756faf	332	# use prototype here to be compatible with get_code_info from Sub::Identify
e0e4674a	333	void
e0e4674a	334	get_code_info(coderef)
00c93f7a	335	SV *coderef
36756faf	336	PROTOTYPE: $
0e0b5b8d	337	PREINIT:
6d915932	338	char *pkg = NULL;
6d915932	339	char *name = NULL;
0e0b5b8d	340	PPCODE:
	341	if (get_code_info(coderef, &pkg, &name)) {
	342	EXTEND(SP, 2);
	343	PUSHs(newSVpv(pkg, 0));
	344	PUSHs(newSVpv(name, 0));
	345	}
e0e4674a	346
9cb15af7	347	# This is some pretty grotty logic. It _should_ be parallel to the
	348	# pure Perl version in lib/Class/MOP.pm, so if you want to understand
	349	# it we suggest you start there.
863178c8	350	void
	351	is_class_loaded(klass=&PL_sv_undef)
	352	SV *klass
	353	PREINIT:
	354	HV *stash;
	355	char *key;
	356	I32 keylen;
5f715d98	357	SV *gv;
863178c8	358	PPCODE:
	359	if (!SvPOK(klass) \|\| !SvCUR(klass)) {
	360	XSRETURN_NO;
	361	}
	362
	363	stash = gv_stashsv(klass, 0);
	364	if (!stash) {
	365	XSRETURN_NO;
	366	}
	367
d508fabd	368	if (hv_exists_ent (stash, key_VERSION, hash_VERSION)) {
d508fabd	369	HE *version = hv_fetch_ent(stash, key_VERSION, 0, hash_VERSION);
b7e6420b	370	SV *version_sv;
	371	if (version && HeVAL(version) && (version_sv = GvSV(HeVAL(version)))) {
	372	if (SvROK(version_sv)) {
	373	SV *version_sv_ref = SvRV(version_sv);
	374
	375	if (SvOK(version_sv_ref)) {
	376	XSRETURN_YES;
	377	}
	378	}
	379	else if (SvOK(version_sv)) {
	380	XSRETURN_YES;
	381	}
863178c8	382	}
	383	}
	384
d508fabd	385	if (hv_exists_ent (stash, key_ISA, hash_ISA)) {
	386	HE *isa = hv_fetch_ent(stash, key_ISA, 0, hash_ISA);
	387	if (isa && HeVAL(isa) && GvAV(HeVAL(isa))) {
863178c8	388	XSRETURN_YES;
	389	}
	390	}
	391
	392	(void)hv_iterinit(stash);
5f715d98	393	while ((gv = hv_iternextsv(stash, &key, &keylen))) {
863178c8	394	if (keylen <= 0) {
	395	continue;
	396	}
	397
	398	if (key[keylen - 1] == ':' && key[keylen - 2] == ':') {
	399	continue;
	400	}
	401
5f715d98	402	if (!isGV(gv) \|\| GvCV(gv)) {
863178c8	403	XSRETURN_YES;
	404	}
	405	}
	406
	407	XSRETURN_NO;
15273f3c	408
	409	MODULE = Class::MOP PACKAGE = Class::MOP::Package
	410
	411	void
b49ee39f	412	get_all_package_symbols(self, filter=TYPE_FILTER_NONE)
cc856b56	413	SV *self
b49ee39f	414	type_filter_t filter
15273f3c	415	PREINIT:
cc856b56	416	HV *stash = NULL;
b49ee39f	417	HV *symbols = NULL;
75705e60	418	register HE *he;
15273f3c	419	PPCODE:
a7f711e5	420	if ( ! SvROK(self) ) {
988fb42e	421	die("Cannot call get_all_package_symbols as a class method");
988fb42e	422	}
15273f3c	423
b49ee39f	424	if (GIMME_V == G_VOID) {
	425	XSRETURN_EMPTY;
	426	}
	427
15273f3c	428	PUTBACK;
15273f3c	429
b49ee39f	430	if ( (he = hv_fetch_ent((HV *)SvRV(self), key_package, 0, hash_package)) ) {
	431	stash = gv_stashsv(HeVAL(he), 0);
	432	}
15273f3c	433
15273f3c	434
b49ee39f	435	if (!stash) {
a4bb3172	436	XSRETURN_UNDEF;
b49ee39f	437	}
15273f3c	438
b49ee39f	439	symbols = get_all_package_symbols(stash, filter);
a4bb3172	440	PUSHs(sv_2mortal(newRV_noinc((SV *)symbols)));
b49ee39f	441
e2c189ae	442	void
cc856b56	443	name(self)
	444	SV *self
	445	PREINIT:
	446	register HE *he;
	447	PPCODE:
a7f711e5	448	if ( ! SvROK(self) ) {
988fb42e	449	die("Cannot call name as a class method");
	450	}
	451
e7b69038	452	if ( (he = hv_fetch_ent((HV *)SvRV(self), key_package, 0, hash_package)) )
cc856b56	453	XPUSHs(HeVAL(he));
	454	else
	455	ST(0) = &PL_sv_undef;
	456
dcbfe027	457	MODULE = Class::MOP PACKAGE = Class::MOP::Attribute
cc856b56	458
e2c189ae	459	void
cc856b56	460	name(self)
	461	SV *self
	462	PREINIT:
	463	register HE *he;
	464	PPCODE:
a7f711e5	465	if ( ! SvROK(self) ) {
988fb42e	466	die("Cannot call name as a class method");
	467	}
	468
e7b69038	469	if ( (he = hv_fetch_ent((HV *)SvRV(self), key_name, 0, hash_name)) )
cc856b56	470	XPUSHs(HeVAL(he));
	471	else
	472	ST(0) = &PL_sv_undef;
	473
dcbfe027	474	MODULE = Class::MOP PACKAGE = Class::MOP::Method
cc856b56	475
e2c189ae	476	void
da88f307	477	name(self)
	478	SV *self
	479	PREINIT:
	480	register HE *he;
	481	PPCODE:
a7f711e5	482	if ( ! SvROK(self) ) {
da88f307	483	die("Cannot call name as a class method");
	484	}
	485
e7b69038	486	if ( (he = hv_fetch_ent((HV *)SvRV(self), key_name, 0, hash_name)) )
da88f307	487	XPUSHs(HeVAL(he));
	488	else
	489	ST(0) = &PL_sv_undef;
	490
e2c189ae	491	void
da88f307	492	package_name(self)
	493	SV *self
	494	PREINIT:
	495	register HE *he;
	496	PPCODE:
a7f711e5	497	if ( ! SvROK(self) ) {
da88f307	498	die("Cannot call package_name as a class method");
	499	}
	500
e7b69038	501	if ( (he = hv_fetch_ent((HV *)SvRV(self), key_package_name, 0, hash_package_name)) )
da88f307	502	XPUSHs(HeVAL(he));
	503	else
	504	ST(0) = &PL_sv_undef;
	505
e2c189ae	506	void
cc856b56	507	body(self)
	508	SV *self
	509	PREINIT:
	510	register HE *he;
	511	PPCODE:
a7f711e5	512	if ( ! SvROK(self) ) {
da88f307	513	die("Cannot call body as a class method");
	514	}
	515
e7b69038	516	if ( (he = hv_fetch_ent((HV *)SvRV(self), key_body, 0, hash_body)) )
cc856b56	517	XPUSHs(HeVAL(he));
	518	else
	519	ST(0) = &PL_sv_undef;
c94afdc4	520
	521
	522	MODULE = Class::MOP PACKAGE = Class::MOP::Class
	523
	524	void
	525	get_method_map(self)
00c93f7a	526	SV *self
c200a770	527	PREINIT:
c686d0ed	528	HV const obj = (HV )SvRV(self);
	529	SV *const class_name = HeVAL( hv_fetch_ent(obj, key_package, 0, hash_package) );
	530	HV *const stash = gv_stashsv(class_name, 0);
c200a770	531	UV const current = check_package_cache_flag(stash);
c686d0ed	532	SV *const cache_flag = HeVAL( hv_fetch_ent(obj, key_package_cache_flag, TRUE, hash_package_cache_flag));
c686d0ed	533	SV *const map_ref = HeVAL( hv_fetch_ent(obj, key_methods, TRUE, hash_methods));
c200a770	534	PPCODE:
c200a770	535	/* in $self->{methods} does not yet exist (or got deleted) */
c686d0ed	536	if ( !SvROK(map_ref) \|\| SvTYPE(SvRV(map_ref)) != SVt_PVHV ) {
00c93f7a	537	SV new_map_ref = newRV_noinc((SV )newHV());
c200a770	538	sv_2mortal(new_map_ref);
	539	sv_setsv(map_ref, new_map_ref);
	540	}
c94afdc4	541
c686d0ed	542	if ( !SvOK(cache_flag) \|\| SvUV(cache_flag) != current ) {
00c93f7a	543	mop_update_method_map(aTHX_ self, class_name, stash, (HV *)SvRV(map_ref));
c200a770	544	sv_setuv(cache_flag, check_package_cache_flag(stash)); /* update_cache_flag() */
c200a770	545	}
	546
	547	XPUSHs(map_ref);