[gitmo/Mouse.git] / xs-src / MouseUtil.xs

#include "mouse.h"

#define MY_CXT_KEY "Mouse::Util::_guts" XS_VERSION
typedef struct {
    HV* metas;
} my_cxt_t;
START_MY_CXT

#define ISA_CACHE "::LINEALIZED_ISA_CACHE::"

#ifdef no_mro_get_linear_isa
AV*
mouse_mro_get_linear_isa(pTHX_ HV* const stash){
    GV* const cachegv = *(GV**)hv_fetchs(stash, ISA_CACHE, TRUE);
    AV* isa;
    SV* gen;
    CV* get_linear_isa;

    if(!isGV(cachegv))
        gv_init(cachegv, stash, ISA_CACHE, sizeof(ISA_CACHE)-1, TRUE);

    isa = GvAVn(cachegv);
    gen = GvSVn(cachegv);


    if(SvIOK(gen) && SvIVX(gen) == (IV)mro_get_pkg_gen(stash)){
        return isa; /* returns the cache if available */
    }
    else{
        SvREFCNT_dec(isa);
        GvAV(cachegv) = isa = newAV();
    }

    get_linear_isa = get_cv("Mouse::Util::get_linear_isa", TRUE);

    {
        SV* avref;
        dSP;

        ENTER;
        SAVETMPS;

        PUSHMARK(SP);
        mXPUSHp(HvNAME_get(stash), HvNAMELEN_get(stash));
        PUTBACK;

        call_sv((SV*)get_linear_isa, G_SCALAR);

        SPAGAIN;
        avref = POPs;
        PUTBACK;

        if(IsArrayRef(avref)){
            AV* const av  = (AV*)SvRV(avref);
            I32 const len = AvFILLp(av) + 1;
            I32 i;

            for(i = 0; i < len; i++){
                HV* const stash = gv_stashsv(AvARRAY(av)[i], FALSE);
                if(stash)
                    av_push(isa, newSVpv(HvNAME(stash), 0));
            }
            SvREADONLY_on(isa);
        }
        else{
            Perl_croak(aTHX_ "Mouse:Util::get_linear_isa() didn't return an ARRAY reference");
        }

        FREETMPS;
        LEAVE;
    }

    sv_setiv(gen, (IV)mro_get_pkg_gen(stash));
    return isa;
}
#endif /* !no_mor_get_linear_isa */

#ifdef DEBUGGING
SV**
mouse_av_at_safe(pTHX_ AV* const av, I32 const ix){
    assert(av);
    assert(SvTYPE(av) == SVt_PVAV);
    assert(AvMAX(av) >= ix);
    return &AvARRAY(av)[ix];
}
#endif

void
mouse_throw_error(SV* const metaobject, SV* const data /* not used */, const char* const fmt, ...){
    dTHX;
    va_list args;
    SV* message;

    assert(metaobject);
    assert(fmt);

    va_start(args, fmt);
    message = vnewSVpvf(fmt, &args);
    va_end(args);

    {
        dSP;
        PUSHMARK(SP);
        EXTEND(SP, 6);

        PUSHs(metaobject);
        mPUSHs(message);

        if(data){ /* extra arg, might be useful for debugging */
            mPUSHs(newSVpvs("data"));
            PUSHs(data);
            mPUSHs(newSVpvs("depth"));
            mPUSHi(-1);
        }
        PUTBACK;
        if(SvOK(metaobject)) {
            call_method("throw_error", G_VOID);
        }
        else {
            call_pv("Mouse::Util::throw_error", G_VOID);
        }
        croak("throw_error() did not throw the error (%"SVf")", message);
    }
}

/* workaround Perl-RT #69939 */
I32
mouse_call_sv_safe(pTHX_ SV* const sv, I32 const flags) {
    I32 count;
    ENTER;
    /* Don't do SAVETMPS */

    SAVESPTR(ERRSV);
    ERRSV = sv_newmortal();

    count = Perl_call_sv(aTHX_ sv, flags | G_EVAL);

    if(sv_true(ERRSV)){
        SV* const err = sv_mortalcopy(ERRSV);
        LEAVE;
        sv_setsv(ERRSV, err);
        croak(NULL); /* rethrow */
    }

    LEAVE;

    return count;
}

void
mouse_must_defined(pTHX_ SV* const value, const char* const name) {
    assert(value);
    assert(name);

    SvGETMAGIC(value);
    if(!SvOK(value)){
        croak("You must define %s", name);
    }
}

void
mouse_must_ref(pTHX_ SV* const value, const char* const name, svtype const t) {
    assert(value);
    assert(name);

    SvGETMAGIC(value);
    if(!(SvROK(value) && (t == SVt_NULL || SvTYPE(SvRV(value)) == t))) {
        croak("You must pass %s, not %s",
            name, SvOK(value) ? SvPV_nolen(value) : "undef");
    }
}


bool
mouse_is_class_loaded(pTHX_ SV * const klass){
    HV *stash;
    GV** gvp;
    HE* he;

    if (!(SvPOKp(klass) && SvCUR(klass))) { /* XXX: SvPOK does not work with magical scalars */
        return FALSE;
    }

    stash = gv_stashsv(klass, FALSE);
    if (!stash) {
        return FALSE;
    }

    if (( gvp = (GV**)hv_fetchs(stash, "VERSION", FALSE) )) {
        if(isGV(*gvp) && GvSV(*gvp) && SvOK(GvSV(*gvp))){
            return TRUE;
        }
    }

    if (( gvp = (GV**)hv_fetchs(stash, "ISA", FALSE) )) {
        if(isGV(*gvp) && GvAV(*gvp) && av_len(GvAV(*gvp)) != -1){
            return TRUE;
        }
    }

    hv_iterinit(stash);
    while(( he = hv_iternext(stash) )){
        GV* const gv = (GV*)HeVAL(he);

        if(isGV(gv)){
            if(GvCVu(gv)){ /* is GV and has CV */
                hv_iterinit(stash); /* reset */
                return TRUE;
            }
        }
        else if(SvOK(gv)){ /* is a stub or constant */
            hv_iterinit(stash); /* reset */
            return TRUE;
        }
    }
    return FALSE;
}


SV*
mouse_call0 (pTHX_ SV* const self, SV* const method) {
    dSP;
    SV *ret;

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

    call_sv_safe(method, G_SCALAR | G_METHOD);

    SPAGAIN;
    ret = POPs;
    PUTBACK;

    return ret;
}

SV*
mouse_call1 (pTHX_ SV* const self, SV* const method, SV* const arg1) {
    dSP;
    SV *ret;

    PUSHMARK(SP);
    EXTEND(SP, 2);
    PUSHs(self);
    PUSHs(arg1);
    PUTBACK;

    call_sv_safe(method, G_SCALAR | G_METHOD);

    SPAGAIN;
    ret = POPs;
    PUTBACK;

    return ret;
}

int
mouse_predicate_call(pTHX_ SV* const self, SV* const method) {
    return sv_true( mcall0(self, method) );
}

SV*
mouse_get_metaclass(pTHX_ SV* metaclass_name){
    dMY_CXT;
    HE* he;

    assert(metaclass_name);
    assert(MY_CXT.metas);

    if(IsObject(metaclass_name)){
        HV* const stash = SvSTASH(SvRV(metaclass_name));

        metaclass_name = newSVpvn_share(HvNAME_get(stash), HvNAMELEN_get(stash), 0U);
        sv_2mortal(metaclass_name);
    }

    he = hv_fetch_ent(MY_CXT.metas, metaclass_name, FALSE, 0U);

    return he ? HeVAL(he) : &PL_sv_undef;
}

MAGIC*
mouse_mg_find(pTHX_ SV* const sv, const MGVTBL* const vtbl, I32 const flags){
    MAGIC* mg;

    assert(sv != NULL);
    for(mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic){
        if(mg->mg_virtual == vtbl){
            return mg;
        }
    }

    if(flags & MOUSEf_DIE_ON_FAIL){
        croak("mouse_mg_find: no MAGIC found for %"SVf, sv_2mortal(newRV_inc(sv)));
    }
    return NULL;
}

GV*
mouse_stash_fetch(pTHX_ HV* const stash, const char* const name, I32 const namelen, I32 const create) {
    GV** const gvp = (GV**)hv_fetch(stash, name, namelen, create);

    if(gvp){
        if(!isGV(*gvp)){
            gv_init(*gvp, stash, name, namelen, GV_ADDMULTI);
        }
        return *gvp;
    }
    else{
        return NULL;
    }
}

void
mouse_install_sub(pTHX_ GV* const gv, SV* const code_ref) {
    CV* cv;

    assert(gv != NULL);
    assert(code_ref != NULL);
    assert(isGV(gv));
    assert(IsCodeRef(code_ref));

    if(GvCVu(gv)){ /* delete *slot{gv} to work around "redefine" warning */
        SvREFCNT_dec(GvCV(gv));
        GvCV_set(gv, NULL);
    }

    sv_setsv_mg((SV*)gv, code_ref); /* *gv = $code_ref */

    /* name the CODE ref if it's anonymous */
    cv = (CV*)SvRV(code_ref);
    if(CvANON(cv)
        && CvGV(cv) /* a cv under construction has no gv */ ){
        HV* dbsub;

        /* update %DB::sub to make NYTProf happy */
        if((PL_perldb & (PERLDBf_SUBLINE|PERLDB_NAMEANON))
            && PL_DBsub && (dbsub = GvHV(PL_DBsub))
        ){
            /* see Perl_newATTRSUB() in op.c */
            SV* const subname = sv_newmortal();
            HE* orig;

            gv_efullname3(subname, CvGV(cv), NULL);
            orig = hv_fetch_ent(dbsub, subname, FALSE, 0U);
            if(orig){
                gv_efullname3(subname, gv, NULL);
                (void)hv_store_ent(dbsub, subname, HeVAL(orig), 0U);
                SvREFCNT_inc_simple_void_NN(HeVAL(orig));
            }
        }

        CvGV_set(cv, gv);
        CvANON_off(cv);
    }
}

MODULE = Mouse::Util  PACKAGE = Mouse::Util

PROTOTYPES:   DISABLE
VERSIONCHECK: DISABLE

BOOT:
{
    MY_CXT_INIT;
    MY_CXT.metas = NULL;
}

void
__register_metaclass_storage(HV* metas, bool cloning)
CODE:
{
    if(cloning){
        MY_CXT_CLONE;
        MY_CXT.metas = NULL;
    }
    {
        dMY_CXT;
        if(MY_CXT.metas && ckWARN(WARN_REDEFINE)){
            Perl_warner(aTHX_ packWARN(WARN_REDEFINE), "Metaclass storage more than once");
        }
        MY_CXT.metas = metas;
        SvREFCNT_inc_simple_void_NN(metas);
    }
}

bool
is_valid_class_name(SV* sv)
CODE:
{
    SvGETMAGIC(sv);
    if(SvPOKp(sv) && SvCUR(sv) > 0){
        UV i;
        RETVAL = TRUE;
        for(i = 0; i < SvCUR(sv); i++){
            char const c = SvPVX(sv)[i];
            if(!(isALNUM(c) || c == ':')){
                RETVAL = FALSE;
                break;
            }
        }
    }
    else{
        RETVAL = SvNIOKp(sv) ? TRUE : FALSE;
    }
}
OUTPUT:
    RETVAL

bool
is_class_loaded(SV* sv)

void
get_code_info(CV* code)
PREINIT:
    GV* gv;
    HV* stash;
PPCODE:
    if((gv = CvGV(code)) && isGV(gv) && (stash = GvSTASH(gv))){
        EXTEND(SP, 2);
        mPUSHs(newSVpvn_share(HvNAME_get(stash), HvNAMELEN_get(stash), 0U));
        mPUSHs(newSVpvn_share(GvNAME_get(gv), GvNAMELEN_get(gv), 0U));
    }

SV*
get_code_package(CV* code)
PREINIT:
    HV* stash;
CODE:
    if(CvGV(code) && isGV(CvGV(code)) && (stash = GvSTASH(CvGV(code)))){
        RETVAL = newSVpvn_share(HvNAME_get(stash), HvNAMELEN_get(stash), 0U);
    }
    else{
        RETVAL = &PL_sv_no;
    }
OUTPUT:
    RETVAL

CV*
get_code_ref(SV* package, SV* name)
CODE:
{
    HV* stash;
    STRLEN name_len;
    const char* name_pv;
    GV* gv;

    must_defined(package, "a package name");
    must_defined(name,    "a subroutine name");

    stash = gv_stashsv(package, FALSE);
    if(!stash){
        XSRETURN_UNDEF;
    }

    name_pv = SvPV_const(name, name_len);
    gv = stash_fetch(stash, name_pv, name_len, FALSE);
    RETVAL = gv ? GvCVu(gv) : NULL;

    if(!RETVAL){
        XSRETURN_UNDEF;
    }
}
OUTPUT:
    RETVAL

void
generate_isa_predicate_for(SV* arg, SV* predicate_name = NULL)
ALIAS:
    generate_isa_predicate_for = 0
    generate_can_predicate_for = 1
PPCODE:
{
    const char* name_pv = NULL;
    CV* xsub;

    must_defined(arg, ix == 0 ? "a class_name" : "method names");

    if(predicate_name){
        must_defined(predicate_name, "a predicate name");
        name_pv = SvPV_nolen_const(predicate_name);
    }

    if(ix == 0){
        xsub = mouse_generate_isa_predicate_for(aTHX_ arg, name_pv);
    }
    else{
        xsub = mouse_generate_can_predicate_for(aTHX_ arg, name_pv);
    }

    if(predicate_name == NULL){ /* anonymous predicate */
        mXPUSHs( newRV_inc((SV*)xsub) );
    }
}

# This xsub will redefine &Mouse::Util::install_subroutines()
void
install_subroutines(SV* into, ...)
CODE:
{
    HV* stash;
    I32 i;

    must_defined(into, "a package name");
    stash = gv_stashsv(into, TRUE);

    if( ((items-1) % 2) != 0 ){
        croak_xs_usage(cv, "into, name => coderef [, other_name, other_coderef ...]");
    }

    for(i = 1; i < items; i += 2) {
        SV* const name = ST(i);
        SV* const code = ST(i+1);
        STRLEN len;
        const char* pv;
        GV* gv;

        must_defined(name, "a subroutine name");
        must_ref(code, "a CODE reference", SVt_PVCV);

        pv = SvPV_const(name, len);
        gv = stash_fetch(stash, pv, len, TRUE);

        mouse_install_sub(aTHX_ gv, code);
    }
}
Commit	Line	Data
646c0371	1	#include "mouse.h"
646c0371	2
fd168725	3	#define MY_CXT_KEY "Mouse::Util::_guts" XS_VERSION
	4	typedef struct {
	5	HV* metas;
	6	} my_cxt_t;
	7	START_MY_CXT
	8
646c0371	9	#define ISA_CACHE "::LINEALIZED_ISA_CACHE::"
	10
	11	#ifdef no_mro_get_linear_isa
	12	AV*
	13	mouse_mro_get_linear_isa(pTHX_ HV* const stash){
6582d0e3	14	GV* const cachegv = (GV*)hv_fetchs(stash, ISA_CACHE, TRUE);
	15	AV* isa;
	16	SV* gen;
	17	CV* get_linear_isa;
	18
	19	if(!isGV(cachegv))
	20	gv_init(cachegv, stash, ISA_CACHE, sizeof(ISA_CACHE)-1, TRUE);
	21
	22	isa = GvAVn(cachegv);
	23	gen = GvSVn(cachegv);
	24
	25
	26	if(SvIOK(gen) && SvIVX(gen) == (IV)mro_get_pkg_gen(stash)){
	27	return isa; /* returns the cache if available */
	28	}
	29	else{
cd658d1f	30	SvREFCNT_dec(isa);
cd658d1f	31	GvAV(cachegv) = isa = newAV();
6582d0e3	32	}
	33
	34	get_linear_isa = get_cv("Mouse::Util::get_linear_isa", TRUE);
	35
	36	{
	37	SV* avref;
	38	dSP;
	39
	40	ENTER;
	41	SAVETMPS;
	42
	43	PUSHMARK(SP);
	44	mXPUSHp(HvNAME_get(stash), HvNAMELEN_get(stash));
	45	PUTBACK;
	46
	47	call_sv((SV*)get_linear_isa, G_SCALAR);
	48
	49	SPAGAIN;
	50	avref = POPs;
	51	PUTBACK;
	52
80aa5731	53	if(IsArrayRef(avref)){
6582d0e3	54	AV* const av = (AV*)SvRV(avref);
	55	I32 const len = AvFILLp(av) + 1;
	56	I32 i;
	57
	58	for(i = 0; i < len; i++){
	59	HV* const stash = gv_stashsv(AvARRAY(av)[i], FALSE);
	60	if(stash)
	61	av_push(isa, newSVpv(HvNAME(stash), 0));
	62	}
	63	SvREADONLY_on(isa);
	64	}
	65	else{
	66	Perl_croak(aTHX_ "Mouse:Util::get_linear_isa() didn't return an ARRAY reference");
	67	}
	68
	69	FREETMPS;
	70	LEAVE;
	71	}
	72
	73	sv_setiv(gen, (IV)mro_get_pkg_gen(stash));
cd658d1f	74	return isa;
646c0371	75	}
	76	#endif /* !no_mor_get_linear_isa */
	77
	78	#ifdef DEBUGGING
	79	SV**
	80	mouse_av_at_safe(pTHX_ AV* const av, I32 const ix){
	81	assert(av);
	82	assert(SvTYPE(av) == SVt_PVAV);
	83	assert(AvMAX(av) >= ix);
	84	return &AvARRAY(av)[ix];
	85	}
	86	#endif
	87
	88	void
	89	mouse_throw_error(SV* const metaobject, SV* const data /* not used /, const char const fmt, ...){
	90	dTHX;
	91	va_list args;
	92	SV* message;
	93
646c0371	94	assert(metaobject);
	95	assert(fmt);
	96
	97	va_start(args, fmt);
	98	message = vnewSVpvf(fmt, &args);
	99	va_end(args);
	100
	101	{
	102	dSP;
	103	PUSHMARK(SP);
077f2efd	104	EXTEND(SP, 6);
646c0371	105
	106	PUSHs(metaobject);
	107	mPUSHs(message);
	108
431e4817	109	if(data){ /* extra arg, might be useful for debugging */
077f2efd	110	mPUSHs(newSVpvs("data"));
431e4817	111	PUSHs(data);
	112	mPUSHs(newSVpvs("depth"));
	113	mPUSHi(-1);
	114	}
646c0371	115	PUTBACK;
dcce2592	116	if(SvOK(metaobject)) {
	117	call_method("throw_error", G_VOID);
	118	}
	119	else {
	120	call_pv("Mouse::Util::throw_error", G_VOID);
	121	}
646c0371	122	croak("throw_error() did not throw the error (%"SVf")", message);
	123	}
	124	}
	125
8fcdb997	126	/* workaround Perl-RT #69939 */
b3cd4c14	127	I32
b3cd4c14	128	mouse_call_sv_safe(pTHX_ SV* const sv, I32 const flags) {
f0e1969b	129	I32 count;
	130	ENTER;
	131	/* Don't do SAVETMPS */
b3cd4c14	132
f0e1969b	133	SAVESPTR(ERRSV);
f0e1969b	134	ERRSV = sv_newmortal();
b3cd4c14	135
f0e1969b	136	count = Perl_call_sv(aTHX_ sv, flags \| G_EVAL);
8fcdb997	137
f0e1969b	138	if(sv_true(ERRSV)){
f0e1969b	139	SV* const err = sv_mortalcopy(ERRSV);
8fcdb997	140	LEAVE;
f0e1969b	141	sv_setsv(ERRSV, err);
f0e1969b	142	croak(NULL); /* rethrow */
b3cd4c14	143	}
f0e1969b	144
	145	LEAVE;
	146
	147	return count;
b3cd4c14	148	}
b3cd4c14	149
d06d9266	150	void
	151	mouse_must_defined(pTHX_ SV* const value, const char* const name) {
	152	assert(value);
	153	assert(name);
	154
	155	SvGETMAGIC(value);
	156	if(!SvOK(value)){
	157	croak("You must define %s", name);
	158	}
	159	}
	160
	161	void
	162	mouse_must_ref(pTHX_ SV* const value, const char* const name, svtype const t) {
	163	assert(value);
	164	assert(name);
	165
	166	SvGETMAGIC(value);
	167	if(!(SvROK(value) && (t == SVt_NULL \|\| SvTYPE(SvRV(value)) == t))) {
	168	croak("You must pass %s, not %s",
	169	name, SvOK(value) ? SvPV_nolen(value) : "undef");
	170	}
	171	}
	172
	173
646c0371	174	bool
	175	mouse_is_class_loaded(pTHX_ SV * const klass){
	176	HV *stash;
	177	GV** gvp;
	178	HE* he;
	179
	180	if (!(SvPOKp(klass) && SvCUR(klass))) { /* XXX: SvPOK does not work with magical scalars */
	181	return FALSE;
	182	}
	183
	184	stash = gv_stashsv(klass, FALSE);
	185	if (!stash) {
	186	return FALSE;
	187	}
	188
	189	if (( gvp = (GV**)hv_fetchs(stash, "VERSION", FALSE) )) {
	190	if(isGV(gvp) && GvSV(gvp) && SvOK(GvSV(*gvp))){
	191	return TRUE;
	192	}
	193	}
	194
	195	if (( gvp = (GV**)hv_fetchs(stash, "ISA", FALSE) )) {
	196	if(isGV(gvp) && GvAV(gvp) && av_len(GvAV(*gvp)) != -1){
	197	return TRUE;
	198	}
	199	}
	200
	201	hv_iterinit(stash);
	202	while(( he = hv_iternext(stash) )){
	203	GV* const gv = (GV*)HeVAL(he);
	204
	205	if(isGV(gv)){
fa4ac648	206	if(GvCVu(gv)){ /* is GV and has CV */
fa4ac648	207	hv_iterinit(stash); /* reset */
646c0371	208	return TRUE;
	209	}
	210	}
fa4ac648	211	else if(SvOK(gv)){ /* is a stub or constant */
fa4ac648	212	hv_iterinit(stash); /* reset */
646c0371	213	return TRUE;
	214	}
	215	}
	216	return FALSE;
	217	}
	218
	219
0aad0266	220	SV*
0aad0266	221	mouse_call0 (pTHX_ SV* const self, SV* const method) {
646c0371	222	dSP;
	223	SV *ret;
	224
	225	PUSHMARK(SP);
	226	XPUSHs(self);
	227	PUTBACK;
	228
b3cd4c14	229	call_sv_safe(method, G_SCALAR \| G_METHOD);
646c0371	230
	231	SPAGAIN;
	232	ret = POPs;
	233	PUTBACK;
	234
	235	return ret;
	236	}
	237
0aad0266	238	SV*
0aad0266	239	mouse_call1 (pTHX_ SV* const self, SV* const method, SV* const arg1) {
646c0371	240	dSP;
	241	SV *ret;
	242
	243	PUSHMARK(SP);
	244	EXTEND(SP, 2);
	245	PUSHs(self);
	246	PUSHs(arg1);
	247	PUTBACK;
	248
b3cd4c14	249	call_sv_safe(method, G_SCALAR \| G_METHOD);
646c0371	250
	251	SPAGAIN;
	252	ret = POPs;
	253	PUTBACK;
	254
	255	return ret;
	256	}
	257
0aad0266	258	int
0aad0266	259	mouse_predicate_call(pTHX_ SV* const self, SV* const method) {
6ad77996	260	return sv_true( mcall0(self, method) );
0aad0266	261	}
0aad0266	262
a39e9541	263	SV*
aa2d2e2c	264	mouse_get_metaclass(pTHX_ SV* metaclass_name){
fd168725	265	dMY_CXT;
fd168725	266	HE* he;
a39e9541	267
aa2d2e2c	268	assert(metaclass_name);
fd168725	269	assert(MY_CXT.metas);
fd168725	270
aa2d2e2c	271	if(IsObject(metaclass_name)){
a5c683f6	272	HV* const stash = SvSTASH(SvRV(metaclass_name));
aa2d2e2c	273
	274	metaclass_name = newSVpvn_share(HvNAME_get(stash), HvNAMELEN_get(stash), 0U);
	275	sv_2mortal(metaclass_name);
	276	}
	277
fd168725	278	he = hv_fetch_ent(MY_CXT.metas, metaclass_name, FALSE, 0U);
a39e9541	279
fd168725	280	return he ? HeVAL(he) : &PL_sv_undef;
a39e9541	281	}
a39e9541	282
646c0371	283	MAGIC*
	284	mouse_mg_find(pTHX_ SV* const sv, const MGVTBL* const vtbl, I32 const flags){
	285	MAGIC* mg;
	286
	287	assert(sv != NULL);
	288	for(mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic){
	289	if(mg->mg_virtual == vtbl){
	290	return mg;
	291	}
	292	}
	293
	294	if(flags & MOUSEf_DIE_ON_FAIL){
	295	croak("mouse_mg_find: no MAGIC found for %"SVf, sv_2mortal(newRV_inc(sv)));
	296	}
	297	return NULL;
	298	}
	299
a39e9541	300	GV*
	301	mouse_stash_fetch(pTHX_ HV* const stash, const char* const name, I32 const namelen, I32 const create) {
	302	GV const gvp = (GV)hv_fetch(stash, name, namelen, create);
	303
	304	if(gvp){
	305	if(!isGV(*gvp)){
	306	gv_init(*gvp, stash, name, namelen, GV_ADDMULTI);
	307	}
	308	return *gvp;
	309	}
	310	else{
	311	return NULL;
	312	}
	313	}
	314
d67f600d	315	void
	316	mouse_install_sub(pTHX_ GV* const gv, SV* const code_ref) {
	317	CV* cv;
	318
	319	assert(gv != NULL);
	320	assert(code_ref != NULL);
	321	assert(isGV(gv));
	322	assert(IsCodeRef(code_ref));
	323
	324	if(GvCVu(gv)){ /* delete slot{gv} to work around "redefine" warning /
	325	SvREFCNT_dec(GvCV(gv));
952a7aee	326	GvCV_set(gv, NULL);
d67f600d	327	}
d06d9266	328
d67f600d	329	sv_setsv_mg((SV)gv, code_ref); / gv = $code_ref /
	330
	331	/* name the CODE ref if it's anonymous */
	332	cv = (CV*)SvRV(code_ref);
	333	if(CvANON(cv)
	334	&& CvGV(cv) /* a cv under construction has no gv */ ){
	335	HV* dbsub;
	336
	337	/* update %DB::sub to make NYTProf happy */
	338	if((PL_perldb & (PERLDBf_SUBLINE\|PERLDB_NAMEANON))
	339	&& PL_DBsub && (dbsub = GvHV(PL_DBsub))
	340	){
	341	/* see Perl_newATTRSUB() in op.c */
	342	SV* const subname = sv_newmortal();
	343	HE* orig;
	344
	345	gv_efullname3(subname, CvGV(cv), NULL);
	346	orig = hv_fetch_ent(dbsub, subname, FALSE, 0U);
	347	if(orig){
	348	gv_efullname3(subname, gv, NULL);
	349	(void)hv_store_ent(dbsub, subname, HeVAL(orig), 0U);
	350	SvREFCNT_inc_simple_void_NN(HeVAL(orig));
	351	}
	352	}
	353
d6ceb359	354	CvGV_set(cv, gv);
d67f600d	355	CvANON_off(cv);
	356	}
	357	}
	358
646c0371	359	MODULE = Mouse::Util PACKAGE = Mouse::Util
	360
	361	PROTOTYPES: DISABLE
	362	VERSIONCHECK: DISABLE
	363
fd168725	364	BOOT:
	365	{
	366	MY_CXT_INIT;
	367	MY_CXT.metas = NULL;
	368	}
	369
	370	void
	371	__register_metaclass_storage(HV* metas, bool cloning)
	372	CODE:
	373	{
	374	if(cloning){
	375	MY_CXT_CLONE;
	376	MY_CXT.metas = NULL;
	377	}
	378	{
	379	dMY_CXT;
25ba356e	380	if(MY_CXT.metas && ckWARN(WARN_REDEFINE)){
	381	Perl_warner(aTHX_ packWARN(WARN_REDEFINE), "Metaclass storage more than once");
	382	}
fd168725	383	MY_CXT.metas = metas;
	384	SvREFCNT_inc_simple_void_NN(metas);
	385	}
	386	}
	387
646c0371	388	bool
0ffc4183	389	is_valid_class_name(SV* sv)
	390	CODE:
	391	{
	392	SvGETMAGIC(sv);
	393	if(SvPOKp(sv) && SvCUR(sv) > 0){
	394	UV i;
	395	RETVAL = TRUE;
	396	for(i = 0; i < SvCUR(sv); i++){
	397	char const c = SvPVX(sv)[i];
	398	if(!(isALNUM(c) \|\| c == ':')){
	399	RETVAL = FALSE;
	400	break;
	401	}
	402	}
	403	}
	404	else{
	405	RETVAL = SvNIOKp(sv) ? TRUE : FALSE;
	406	}
	407	}
	408	OUTPUT:
	409	RETVAL
	410
	411	bool
646c0371	412	is_class_loaded(SV* sv)
	413
	414	void
	415	get_code_info(CV* code)
	416	PREINIT:
	417	GV* gv;
	418	HV* stash;
	419	PPCODE:
	420	if((gv = CvGV(code)) && isGV(gv) && (stash = GvSTASH(gv))){
	421	EXTEND(SP, 2);
	422	mPUSHs(newSVpvn_share(HvNAME_get(stash), HvNAMELEN_get(stash), 0U));
	423	mPUSHs(newSVpvn_share(GvNAME_get(gv), GvNAMELEN_get(gv), 0U));
	424	}
	425
	426	SV*
	427	get_code_package(CV* code)
	428	PREINIT:
	429	HV* stash;
	430	CODE:
	431	if(CvGV(code) && isGV(CvGV(code)) && (stash = GvSTASH(CvGV(code)))){
	432	RETVAL = newSVpvn_share(HvNAME_get(stash), HvNAMELEN_get(stash), 0U);
	433	}
	434	else{
	435	RETVAL = &PL_sv_no;
	436	}
	437	OUTPUT:
	438	RETVAL
	439
	440	CV*
	441	get_code_ref(SV* package, SV* name)
	442	CODE:
	443	{
	444	HV* stash;
a39e9541	445	STRLEN name_len;
	446	const char* name_pv;
	447	GV* gv;
646c0371	448
d06d9266	449	must_defined(package, "a package name");
d06d9266	450	must_defined(name, "a subroutine name");
646c0371	451
	452	stash = gv_stashsv(package, FALSE);
	453	if(!stash){
	454	XSRETURN_UNDEF;
	455	}
a39e9541	456
	457	name_pv = SvPV_const(name, name_len);
	458	gv = stash_fetch(stash, name_pv, name_len, FALSE);
	459	RETVAL = gv ? GvCVu(gv) : NULL;
646c0371	460
	461	if(!RETVAL){
	462	XSRETURN_UNDEF;
	463	}
	464	}
	465	OUTPUT:
	466	RETVAL
	467
	468	void
ebe91068	469	generate_isa_predicate_for(SV* arg, SV* predicate_name = NULL)
	470	ALIAS:
	471	generate_isa_predicate_for = 0
	472	generate_can_predicate_for = 1
646c0371	473	PPCODE:
646c0371	474	{
441964ce	475	const char* name_pv = NULL;
646c0371	476	CV* xsub;
646c0371	477
d06d9266	478	must_defined(arg, ix == 0 ? "a class_name" : "method names");
646c0371	479
441964ce	480	if(predicate_name){
d06d9266	481	must_defined(predicate_name, "a predicate name");
441964ce	482	name_pv = SvPV_nolen_const(predicate_name);
646c0371	483	}
646c0371	484
ebe91068	485	if(ix == 0){
	486	xsub = mouse_generate_isa_predicate_for(aTHX_ arg, name_pv);
	487	}
	488	else{
	489	xsub = mouse_generate_can_predicate_for(aTHX_ arg, name_pv);
	490	}
441964ce	491
646c0371	492	if(predicate_name == NULL){ /* anonymous predicate */
73337709	493	mXPUSHs( newRV_inc((SV*)xsub) );
646c0371	494	}
646c0371	495	}
d67f600d	496
	497	# This xsub will redefine &Mouse::Util::install_subroutines()
	498	void
	499	install_subroutines(SV* into, ...)
	500	CODE:
	501	{
	502	HV* stash;
	503	I32 i;
	504
d06d9266	505	must_defined(into, "a package name");
d67f600d	506	stash = gv_stashsv(into, TRUE);
	507
	508	if( ((items-1) % 2) != 0 ){
	509	croak_xs_usage(cv, "into, name => coderef [, other_name, other_coderef ...]");
	510	}
	511
	512	for(i = 1; i < items; i += 2) {
	513	SV* const name = ST(i);
	514	SV* const code = ST(i+1);
	515	STRLEN len;
	516	const char* pv;
	517	GV* gv;
	518
d06d9266	519	must_defined(name, "a subroutine name");
d06d9266	520	must_ref(code, "a CODE reference", SVt_PVCV);
d67f600d	521
	522	pv = SvPV_const(name, len);
	523	gv = stash_fetch(stash, pv, len, TRUE);
	524
	525	mouse_install_sub(aTHX_ gv, code);
	526	}
	527	}