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

#include "mouse.h"

#define CHECK_INSTANCE(instance) STMT_START{                           \
        assert(instance);                                              \
        if(!(SvROK(instance) && SvTYPE(SvRV(instance)) == SVt_PVHV)){  \
            croak("Invalid object instance: '%"SVf"'", instance);      \
        }                                                              \
    } STMT_END


#define MOUSE_mg_attribute(mg) MOUSE_xa_attribute(MOUSE_mg_xa(mg))

static MGVTBL mouse_accessor_vtbl; /* MAGIC identity */

#define dMOUSE_self  SV* const self = mouse_accessor_get_self(aTHX_ ax, items, cv)

STATIC_INLINE SV*
mouse_accessor_get_self(pTHX_ I32 const ax, I32 const items, CV* const cv) {
    if(items < 1){
        croak("Too few arguments for %s", GvNAME(CvGV(cv)));
    }

    /* NOTE: If self has GETMAGIC, $self->accessor will invoke GETMAGIC
     *       before calling methods, so SvGETMAGIC(self) is not necessarily needed here.
     */

    return ST(0);
}


CV*
mouse_accessor_generate(pTHX_ SV* const attr, XSUBADDR_t const accessor_impl){
    AV* const xa = mouse_get_xa(aTHX_ attr);
    CV* xsub;
    MAGIC* mg;

    xsub = newXS(NULL, accessor_impl, __FILE__);
    sv_2mortal((SV*)xsub);

    mg = sv_magicext((SV*)xsub, MOUSE_xa_slot(xa), PERL_MAGIC_ext, &mouse_accessor_vtbl, (char*)xa, HEf_SVKEY);

    MOUSE_mg_flags(mg) = (U16)MOUSE_xa_flags(xa);

    /* NOTE:
     * although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
     */
    CvXSUBANY(xsub).any_ptr = (void*)mg;

    return xsub;
}


#define PUSH_VALUE(value, flags) STMT_START { \
        if((flags) & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY){ \
            mouse_push_values(aTHX_ value, (flags));                       \
        }                                                                  \
        else{                                                              \
            dSP;                                                           \
            XPUSHs(value ? value : &PL_sv_undef);                          \
            PUTBACK;                                                       \
        }                                                                  \
    } STMT_END                                                             \

/* pushes return values, does auto-deref if needed */
static void
mouse_push_values(pTHX_ SV* const value, U16 const flags){
    dSP;

    assert( flags & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY );

    if(!(value && SvOK(value))){
        return;
    }

    if(flags & MOUSEf_TC_IS_ARRAYREF){
        AV* av;
        I32 len;
        I32 i;

        if(!IsArrayRef(value)){
            croak("Mouse-panic: Not an ARRAY reference");
        }

        av  = (AV*)SvRV(value);
        len = av_len(av) + 1;
        EXTEND(SP, len);
        for(i = 0; i < len; i++){
            SV** const svp = av_fetch(av, i, FALSE);
            PUSHs(svp ? *svp : &PL_sv_undef);
        }
    }
    else{
        HV* hv;
        HE* he;

        assert(flags & MOUSEf_TC_IS_HASHREF);

        if(!IsHashRef(value)){
            croak("Mouse-panic: Not a HASH reference");
        }

        hv = (HV*)SvRV(value);
        hv_iterinit(hv);
        while((he = hv_iternext(hv))){
            EXTEND(SP, 2);
            PUSHs(hv_iterkeysv(he));
            PUSHs(hv_iterval(hv, he));
        }
    }

    PUTBACK;
}

static void
mouse_attr_get(pTHX_ SV* const self, MAGIC* const mg){
    U16 const flags = MOUSE_mg_flags(mg);
    SV* value;

    value = get_slot(self, MOUSE_mg_slot(mg));

    /* check_lazy */
    if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
        value = mouse_xa_set_default(aTHX_ MOUSE_mg_xa(mg), self);
    }

    PUSH_VALUE(value, flags);
}

static void
mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
    U16 const flags = MOUSE_mg_flags(mg);
    SV* const slot  = MOUSE_mg_slot(mg);

    if(flags & MOUSEf_ATTR_HAS_TC){
        value = mouse_xa_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
    }

    value = set_slot(self, slot, value);

    if(flags & MOUSEf_ATTR_IS_WEAK_REF){
        weaken_slot(self, slot);
    }

    if(flags & MOUSEf_ATTR_HAS_TRIGGER){
        SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
        dSP;

        /* NOTE: triggers can remove value, so
                 value must be copied here,
                 revealed by Net::Google::DataAPI (DANJOU).
         */
        value = sv_mortalcopy(value);

        PUSHMARK(SP);
        EXTEND(SP, 2);
        PUSHs(self);
        PUSHs(value);

        PUTBACK;
        call_sv_safe(trigger, G_VOID | G_DISCARD);
        /* need not SPAGAIN */

        assert(SvTYPE(value) != SVTYPEMASK);
    }

    PUSH_VALUE(value, flags);
}

XS(XS_Mouse_accessor)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    MAGIC* const mg = (MAGIC*)XSANY.any_ptr;

    SP -= items; /* PPCODE */
    PUTBACK;

    if(items == 1){ /* reader */
        mouse_attr_get(aTHX_ self, mg);
    }
    else if (items == 2){ /* writer */
        mouse_attr_set(aTHX_ self, mg, ST(1));
    }
    else{
        mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
            "Expected exactly one or two argument for an accessor of %"SVf,
            MOUSE_mg_slot(mg));
    }
}


XS(XS_Mouse_reader)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    MAGIC* const mg = (MAGIC*)XSANY.any_ptr;

    if (items != 1) {
        mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
            "Cannot assign a value to a read-only accessor of %"SVf,
            MOUSE_mg_slot(mg));
    }

    SP -= items; /* PPCODE */
    PUTBACK;

    mouse_attr_get(aTHX_ self, mg);
}

XS(XS_Mouse_writer)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    MAGIC* const mg = (MAGIC*)XSANY.any_ptr;

    if (items != 2) {
        mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
            "Too few arguments for a write-only accessor of %"SVf,
            MOUSE_mg_slot(mg));
    }

    SP -= items; /* PPCODE */
    PUTBACK;

    mouse_attr_set(aTHX_ self, mg, ST(1));
}

/* simple accessors */

/*
static MAGIC*
mouse_accessor_get_mg(pTHX_ CV* const xsub){
    return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
}
*/

CV*
mouse_simple_accessor_generate(pTHX_
    const char* const fq_name, const char* const key, I32 const keylen,
    XSUBADDR_t const accessor_impl, void* const dptr, I32 const dlen) {
    CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
    SV* const slot = newSVpvn_share(key, keylen, 0U);
    MAGIC* mg;

    if(!fq_name){
        /* anonymous xsubs need sv_2mortal */
        sv_2mortal((SV*)xsub);
    }

    mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, (char*)dptr, dlen);
    SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */
    if(dlen == HEf_SVKEY){
        SvREFCNT_dec(dptr);
    }

    /* NOTE:
     * although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
     */
    CvXSUBANY(xsub).any_ptr = (void*)mg;

    return xsub;
}

XS(XS_Mouse_simple_reader)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
    SV* value;

    if (items != 1) {
        croak("Expected exactly one argument for a reader of %"SVf,
            MOUSE_mg_slot(mg));
    }

    value = get_slot(self, MOUSE_mg_slot(mg));
    if(!value) {
        if(MOUSE_mg_ptr(mg)){
            /* the default value must be a SV */
            assert(MOUSE_mg_len(mg) == HEf_SVKEY);
            value = (SV*)MOUSE_mg_ptr(mg);
        }
        else{
            value = &PL_sv_undef;
        }
    }

    ST(0) = value;
    XSRETURN(1);
}


XS(XS_Mouse_simple_writer)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);

    if (items != 2) {
        croak("Expected exactly two argument for a writer of %"SVf,
            slot);
    }

    ST(0) = set_slot(self, slot, ST(1));
    XSRETURN(1);
}

XS(XS_Mouse_simple_clearer)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
    SV* value;

    if (items != 1) {
        croak("Expected exactly one argument for a clearer of %"SVf,
            slot);
    }

    value = delete_slot(self, slot);
    ST(0) = value ? value : &PL_sv_undef;
    XSRETURN(1);
}

XS(XS_Mouse_simple_predicate)
{
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);

    if (items != 1) {
        croak("Expected exactly one argument for a predicate of %"SVf, slot);
    }

    ST(0) = boolSV( has_slot(self, slot) );
    XSRETURN(1);
}

/* Class::Data::Inheritable-like class accessor */
XS(XS_Mouse_inheritable_class_accessor) {
    dVAR; dXSARGS;
    dMOUSE_self;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
    SV* value;
    HV* stash;

    if(items == 1){ /* reader */
        value = NULL;
    }
    else if (items == 2){ /* writer */
        value = ST(1);
    }
    else{
        croak("Expected exactly one or two argument for a class data accessor"
            "of %"SVf, slot);
        value = NULL; /* -Wuninitialized */
    }

    stash = mouse_get_namespace(aTHX_ self);

    if(!value) { /* reader */
        value = get_slot(self, slot);
        if(!value) {
            AV* const isa   = mro_get_linear_isa(stash);
            I32 const len   = av_len(isa) + 1;
            I32 i;
            for(i = 1; i < len; i++) {
                SV* const klass = MOUSE_av_at(isa, i);
                SV* const meta  = get_metaclass(klass);
                if(!SvOK(meta)){
                    continue; /* skip non-Mouse classes */
                }
                value = get_slot(meta, slot);
                if(value) {
                    break;
                }
            }
            if(!value) {
                value = &PL_sv_undef;
            }
        }
    }
    else { /* writer */
        set_slot(self, slot, value);
        mro_method_changed_in(stash);
    }

    ST(0) = value;
    XSRETURN(1);
}

/* simple instance slot accessor (or Mouse::Meta::Instance) */

SV*
mouse_instance_create(pTHX_ HV* const stash) {
    SV* instance;
    assert(stash);
    assert(SvTYPE(stash) == SVt_PVHV);
    instance = sv_bless( newRV_noinc((SV*)newHV()), stash );
    return sv_2mortal(instance);
}

SV*
mouse_instance_clone(pTHX_ SV* const instance) {
    SV* proto;
    CHECK_INSTANCE(instance);
    assert(SvOBJECT(SvRV(instance)));

    proto = newRV_noinc((SV*)newHVhv((HV*)SvRV(instance)));
    sv_bless(proto, SvSTASH(SvRV(instance)));
    return sv_2mortal(proto);
}

bool
mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
    assert(slot);
    CHECK_INSTANCE(instance);
    return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
}

SV*
mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
    HE* he;
    assert(slot);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
    return he ? HeVAL(he) : NULL;
}

SV*
mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
    HE* he;
    SV* sv;
    assert(slot);
    assert(value);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
    sv = HeVAL(he);
    sv_setsv(sv, value);
    SvSETMAGIC(sv);
    return sv;
}

SV*
mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
    assert(instance);
    assert(slot);
    CHECK_INSTANCE(instance);
    return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
}

void
mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
    HE* he;
    assert(slot);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
    if(he){
        sv_rvweaken(HeVAL(he));
    }
}

MODULE = Mouse::Meta::Method::Accessor::XS  PACKAGE = Mouse::Meta::Method::Accessor::XS

PROTOTYPES:   DISABLE
VERSIONCHECK: DISABLE

CV*
_generate_accessor(klass, SV* attr, metaclass)
CODE:
{
    RETVAL = mouse_accessor_generate(aTHX_ attr, XS_Mouse_accessor);
}
OUTPUT:
    RETVAL

CV*
_generate_reader(klass, SV* attr, metaclass)
CODE:
{
    RETVAL = mouse_accessor_generate(aTHX_ attr, XS_Mouse_reader);
}
OUTPUT:
    RETVAL

CV*
_generate_writer(klass, SV* attr, metaclass)
CODE:
{
    RETVAL = mouse_accessor_generate(aTHX_ attr, XS_Mouse_writer);
}
OUTPUT:
    RETVAL

CV*
_generate_clearer(klass, SV* attr, metaclass)
CODE:
{
    SV* const slot = mcall0(attr, mouse_name);
    STRLEN len;
    const char* const pv = SvPV_const(slot, len);
    RETVAL = mouse_simple_accessor_generate(aTHX_ NULL, pv, len, XS_Mouse_simple_clearer, NULL, 0);
}
OUTPUT:
    RETVAL

CV*
_generate_predicate(klass, SV* attr, metaclass)
CODE:
{
    SV* const slot = mcall0(attr, mouse_name);
    STRLEN len;
    const char* const pv = SvPV_const(slot, len);
    RETVAL = mouse_simple_accessor_generate(aTHX_ NULL, pv, len, XS_Mouse_simple_predicate, NULL, 0);
}
OUTPUT:
    RETVAL
Commit	Line	Data
646c0371	1	#include "mouse.h"
646c0371	2
73d8d597	3	#define CHECK_INSTANCE(instance) STMT_START{ \
fcdc12ac	4	assert(instance); \
73d8d597	5	if(!(SvROK(instance) && SvTYPE(SvRV(instance)) == SVt_PVHV)){ \
ef53a04b	6	croak("Invalid object instance: '%"SVf"'", instance); \
73d8d597	7	} \
646c0371	8	} STMT_END
646c0371	9
646c0371	10
	11	#define MOUSE_mg_attribute(mg) MOUSE_xa_attribute(MOUSE_mg_xa(mg))
	12
646c0371	13	static MGVTBL mouse_accessor_vtbl; /* MAGIC identity */
646c0371	14
cc7cd81f	15	#define dMOUSE_self SV* const self = mouse_accessor_get_self(aTHX_ ax, items, cv)
646c0371	16
fc650569	17	STATIC_INLINE SV*
646c0371	18	mouse_accessor_get_self(pTHX_ I32 const ax, I32 const items, CV* const cv) {
646c0371	19	if(items < 1){
	20	croak("Too few arguments for %s", GvNAME(CvGV(cv)));
	21	}
	22
	23	/* NOTE: If self has GETMAGIC, $self->accessor will invoke GETMAGIC
	24	* before calling methods, so SvGETMAGIC(self) is not necessarily needed here.
	25	*/
	26
76770976	27	return ST(0);
646c0371	28	}
	29
	30
	31	CV*
a17f6313	32	mouse_accessor_generate(pTHX_ SV* const attr, XSUBADDR_t const accessor_impl){
0aad0266	33	AV* const xa = mouse_get_xa(aTHX_ attr);
646c0371	34	CV* xsub;
646c0371	35	MAGIC* mg;
646c0371	36
	37	xsub = newXS(NULL, accessor_impl, __FILE__);
	38	sv_2mortal((SV*)xsub);
	39
0aad0266	40	mg = sv_magicext((SV)xsub, MOUSE_xa_slot(xa), PERL_MAGIC_ext, &mouse_accessor_vtbl, (char)xa, HEf_SVKEY);
0aad0266	41
4e7e3250	42	MOUSE_mg_flags(mg) = (U16)MOUSE_xa_flags(xa);
646c0371	43
	44	/* NOTE:
	45	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
	46	*/
	47	CvXSUBANY(xsub).any_ptr = (void*)mg;
	48
646c0371	49	return xsub;
	50	}
	51
646c0371	52
208ffaeb	53	#define PUSH_VALUE(value, flags) STMT_START { \
	54	if((flags) & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY){ \
	55	mouse_push_values(aTHX_ value, (flags)); \
	56	} \
	57	else{ \
	58	dSP; \
	59	XPUSHs(value ? value : &PL_sv_undef); \
	60	PUTBACK; \
	61	} \
	62	} STMT_END \
646c0371	63
	64	/* pushes return values, does auto-deref if needed */
	65	static void
	66	mouse_push_values(pTHX_ SV* const value, U16 const flags){
	67	dSP;
	68
208ffaeb	69	assert( flags & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY );
646c0371	70
208ffaeb	71	if(!(value && SvOK(value))){
	72	return;
	73	}
646c0371	74
208ffaeb	75	if(flags & MOUSEf_TC_IS_ARRAYREF){
80aa5731	76	AV* av;
208ffaeb	77	I32 len;
208ffaeb	78	I32 i;
646c0371	79
80aa5731	80	if(!IsArrayRef(value)){
208ffaeb	81	croak("Mouse-panic: Not an ARRAY reference");
646c0371	82	}
646c0371	83
80aa5731	84	av = (AV*)SvRV(value);
208ffaeb	85	len = av_len(av) + 1;
	86	EXTEND(SP, len);
	87	for(i = 0; i < len; i++){
	88	SV** const svp = av_fetch(av, i, FALSE);
	89	PUSHs(svp ? *svp : &PL_sv_undef);
646c0371	90	}
646c0371	91	}
caf77af6	92	else{
80aa5731	93	HV* hv;
208ffaeb	94	HE* he;
208ffaeb	95
caf77af6	96	assert(flags & MOUSEf_TC_IS_HASHREF);
caf77af6	97
80aa5731	98	if(!IsHashRef(value)){
208ffaeb	99	croak("Mouse-panic: Not a HASH reference");
	100	}
	101
80aa5731	102	hv = (HV*)SvRV(value);
208ffaeb	103	hv_iterinit(hv);
	104	while((he = hv_iternext(hv))){
	105	EXTEND(SP, 2);
	106	PUSHs(hv_iterkeysv(he));
	107	PUSHs(hv_iterval(hv, he));
	108	}
646c0371	109	}
	110
	111	PUTBACK;
	112	}
	113
	114	static void
	115	mouse_attr_get(pTHX_ SV* const self, MAGIC* const mg){
	116	U16 const flags = MOUSE_mg_flags(mg);
646c0371	117	SV* value;
646c0371	118
4e7e3250	119	value = get_slot(self, MOUSE_mg_slot(mg));
646c0371	120
	121	/* check_lazy */
	122	if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
4e7e3250	123	value = mouse_xa_set_default(aTHX_ MOUSE_mg_xa(mg), self);
646c0371	124	}
646c0371	125
208ffaeb	126	PUSH_VALUE(value, flags);
646c0371	127	}
	128
	129	static void
	130	mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
	131	U16 const flags = MOUSE_mg_flags(mg);
	132	SV* const slot = MOUSE_mg_slot(mg);
	133
	134	if(flags & MOUSEf_ATTR_HAS_TC){
4e7e3250	135	value = mouse_xa_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
646c0371	136	}
646c0371	137
ca8e67d6	138	value = set_slot(self, slot, value);
646c0371	139
646c0371	140	if(flags & MOUSEf_ATTR_IS_WEAK_REF){
6fe2272b	141	weaken_slot(self, slot);
646c0371	142	}
	143
	144	if(flags & MOUSEf_ATTR_HAS_TRIGGER){
	145	SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
	146	dSP;
	147
8ab2c6ab	148	/* NOTE: triggers can remove value, so
	149	value must be copied here,
	150	revealed by Net::Google::DataAPI (DANJOU).
	151	*/
	152	value = sv_mortalcopy(value);
	153
646c0371	154	PUSHMARK(SP);
	155	EXTEND(SP, 2);
	156	PUSHs(self);
	157	PUSHs(value);
	158
	159	PUTBACK;
b3cd4c14	160	call_sv_safe(trigger, G_VOID \| G_DISCARD);
646c0371	161	/* need not SPAGAIN */
8ab2c6ab	162
8ab2c6ab	163	assert(SvTYPE(value) != SVTYPEMASK);
646c0371	164	}
646c0371	165
208ffaeb	166	PUSH_VALUE(value, flags);
646c0371	167	}
646c0371	168
30e11004	169	XS(XS_Mouse_accessor)
646c0371	170	{
	171	dVAR; dXSARGS;
	172	dMOUSE_self;
	173	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	174
	175	SP -= items; /* PPCODE */
	176	PUTBACK;
	177
	178	if(items == 1){ /* reader */
	179	mouse_attr_get(aTHX_ self, mg);
	180	}
	181	else if (items == 2){ /* writer */
	182	mouse_attr_set(aTHX_ self, mg, ST(1));
	183	}
	184	else{
	185	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
fad99075	186	"Expected exactly one or two argument for an accessor of %"SVf,
fad99075	187	MOUSE_mg_slot(mg));
646c0371	188	}
	189	}
	190
	191
30e11004	192	XS(XS_Mouse_reader)
646c0371	193	{
	194	dVAR; dXSARGS;
	195	dMOUSE_self;
	196	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	197
	198	if (items != 1) {
	199	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
fad99075	200	"Cannot assign a value to a read-only accessor of %"SVf,
fad99075	201	MOUSE_mg_slot(mg));
646c0371	202	}
	203
	204	SP -= items; /* PPCODE */
	205	PUTBACK;
	206
	207	mouse_attr_get(aTHX_ self, mg);
	208	}
	209
30e11004	210	XS(XS_Mouse_writer)
646c0371	211	{
	212	dVAR; dXSARGS;
	213	dMOUSE_self;
	214	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	215
	216	if (items != 2) {
	217	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
fad99075	218	"Too few arguments for a write-only accessor of %"SVf,
fad99075	219	MOUSE_mg_slot(mg));
646c0371	220	}
	221
	222	SP -= items; /* PPCODE */
	223	PUTBACK;
	224
	225	mouse_attr_set(aTHX_ self, mg, ST(1));
	226	}
	227
	228	/* simple accessors */
	229
	230	/*
	231	static MAGIC*
	232	mouse_accessor_get_mg(pTHX_ CV* const xsub){
	233	return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
	234	}
	235	*/
	236
	237	CV*
fad99075	238	mouse_simple_accessor_generate(pTHX_
	239	const char* const fq_name, const char* const key, I32 const keylen,
	240	XSUBADDR_t const accessor_impl, void* const dptr, I32 const dlen) {
646c0371	241	CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
	242	SV* const slot = newSVpvn_share(key, keylen, 0U);
	243	MAGIC* mg;
	244
	245	if(!fq_name){
	246	/* anonymous xsubs need sv_2mortal */
	247	sv_2mortal((SV*)xsub);
	248	}
	249
e058b279	250	mg = sv_magicext((SV)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, (char)dptr, dlen);
646c0371	251	SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */
e058b279	252	if(dlen == HEf_SVKEY){
	253	SvREFCNT_dec(dptr);
	254	}
646c0371	255
	256	/* NOTE:
	257	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
	258	*/
	259	CvXSUBANY(xsub).any_ptr = (void*)mg;
	260
	261	return xsub;
	262	}
	263
30e11004	264	XS(XS_Mouse_simple_reader)
646c0371	265	{
	266	dVAR; dXSARGS;
	267	dMOUSE_self;
e058b279	268	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
646c0371	269	SV* value;
	270
	271	if (items != 1) {
fad99075	272	croak("Expected exactly one argument for a reader of %"SVf,
fad99075	273	MOUSE_mg_slot(mg));
646c0371	274	}
646c0371	275
e058b279	276	value = get_slot(self, MOUSE_mg_slot(mg));
2468f1d7	277	if(!value) {
	278	if(MOUSE_mg_ptr(mg)){
	279	/* the default value must be a SV */
	280	assert(MOUSE_mg_len(mg) == HEf_SVKEY);
	281	value = (SV*)MOUSE_mg_ptr(mg);
	282	}
	283	else{
	284	value = &PL_sv_undef;
	285	}
	286	}
	287
	288	ST(0) = value;
646c0371	289	XSRETURN(1);
	290	}
	291
	292
30e11004	293	XS(XS_Mouse_simple_writer)
646c0371	294	{
	295	dVAR; dXSARGS;
	296	dMOUSE_self;
	297	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	298
	299	if (items != 2) {
fad99075	300	croak("Expected exactly two argument for a writer of %"SVf,
fad99075	301	slot);
646c0371	302	}
646c0371	303
6fe2272b	304	ST(0) = set_slot(self, slot, ST(1));
646c0371	305	XSRETURN(1);
	306	}
	307
30e11004	308	XS(XS_Mouse_simple_clearer)
646c0371	309	{
	310	dVAR; dXSARGS;
	311	dMOUSE_self;
	312	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	313	SV* value;
	314
	315	if (items != 1) {
fad99075	316	croak("Expected exactly one argument for a clearer of %"SVf,
fad99075	317	slot);
646c0371	318	}
646c0371	319
6fe2272b	320	value = delete_slot(self, slot);
646c0371	321	ST(0) = value ? value : &PL_sv_undef;
	322	XSRETURN(1);
	323	}
	324
30e11004	325	XS(XS_Mouse_simple_predicate)
646c0371	326	{
	327	dVAR; dXSARGS;
	328	dMOUSE_self;
	329	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	330
	331	if (items != 1) {
fad99075	332	croak("Expected exactly one argument for a predicate of %"SVf, slot);
646c0371	333	}
646c0371	334
6fe2272b	335	ST(0) = boolSV( has_slot(self, slot) );
646c0371	336	XSRETURN(1);
	337	}
	338
fad99075	339	/* Class::Data::Inheritable-like class accessor */
	340	XS(XS_Mouse_inheritable_class_accessor) {
	341	dVAR; dXSARGS;
	342	dMOUSE_self;
	343	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	344	SV* value;
fad99075	345	HV* stash;
	346
	347	if(items == 1){ /* reader */
	348	value = NULL;
	349	}
	350	else if (items == 2){ /* writer */
	351	value = ST(1);
	352	}
	353	else{
	354	croak("Expected exactly one or two argument for a class data accessor"
	355	"of %"SVf, slot);
	356	value = NULL; /* -Wuninitialized */
	357	}
	358
05e658dc	359	stash = mouse_get_namespace(aTHX_ self);
fad99075	360
	361	if(!value) { /* reader */
	362	value = get_slot(self, slot);
	363	if(!value) {
	364	AV* const isa = mro_get_linear_isa(stash);
	365	I32 const len = av_len(isa) + 1;
	366	I32 i;
	367	for(i = 1; i < len; i++) {
	368	SV* const klass = MOUSE_av_at(isa, i);
	369	SV* const meta = get_metaclass(klass);
	370	if(!SvOK(meta)){
	371	continue; /* skip non-Mouse classes */
	372	}
	373	value = get_slot(meta, slot);
	374	if(value) {
	375	break;
	376	}
	377	}
	378	if(!value) {
	379	value = &PL_sv_undef;
	380	}
	381	}
	382	}
	383	else { /* writer */
	384	set_slot(self, slot, value);
	385	mro_method_changed_in(stash);
	386	}
	387
	388	ST(0) = value;
	389	XSRETURN(1);
	390	}
	391
76770976	392	/* simple instance slot accessor (or Mouse::Meta::Instance) */
646c0371	393
	394	SV*
	395	mouse_instance_create(pTHX_ HV* const stash) {
fcdc12ac	396	SV* instance;
646c0371	397	assert(stash);
aa2d2e2c	398	assert(SvTYPE(stash) == SVt_PVHV);
fcdc12ac	399	instance = sv_bless( newRV_noinc((SV*)newHV()), stash );
fcdc12ac	400	return sv_2mortal(instance);
646c0371	401	}
	402
	403	SV*
	404	mouse_instance_clone(pTHX_ SV* const instance) {
fcdc12ac	405	SV* proto;
646c0371	406	CHECK_INSTANCE(instance);
fcdc12ac	407	assert(SvOBJECT(SvRV(instance)));
	408
	409	proto = newRV_noinc((SV)newHVhv((HV)SvRV(instance)));
	410	sv_bless(proto, SvSTASH(SvRV(instance)));
	411	return sv_2mortal(proto);
646c0371	412	}
	413
	414	bool
	415	mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
646c0371	416	assert(slot);
	417	CHECK_INSTANCE(instance);
	418	return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
	419	}
	420
	421	SV*
	422	mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
	423	HE* he;
646c0371	424	assert(slot);
	425	CHECK_INSTANCE(instance);
	426	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
	427	return he ? HeVAL(he) : NULL;
	428	}
	429
	430	SV*
	431	mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
	432	HE* he;
	433	SV* sv;
646c0371	434	assert(slot);
	435	assert(value);
	436	CHECK_INSTANCE(instance);
	437	he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
	438	sv = HeVAL(he);
957474ad	439	sv_setsv(sv, value);
957474ad	440	SvSETMAGIC(sv);
646c0371	441	return sv;
	442	}
	443
	444	SV*
	445	mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
	446	assert(instance);
	447	assert(slot);
	448	CHECK_INSTANCE(instance);
	449	return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
	450	}
	451
	452	void
	453	mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
	454	HE* he;
646c0371	455	assert(slot);
	456	CHECK_INSTANCE(instance);
	457	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
	458	if(he){
	459	sv_rvweaken(HeVAL(he));
	460	}
	461	}
346a3ab8	462
646c0371	463	MODULE = Mouse::Meta::Method::Accessor::XS PACKAGE = Mouse::Meta::Method::Accessor::XS
	464
	465	PROTOTYPES: DISABLE
	466	VERSIONCHECK: DISABLE
	467
	468	CV*
	469	_generate_accessor(klass, SV* attr, metaclass)
	470	CODE:
	471	{
a17f6313	472	RETVAL = mouse_accessor_generate(aTHX_ attr, XS_Mouse_accessor);
646c0371	473	}
	474	OUTPUT:
	475	RETVAL
	476
	477	CV*
	478	_generate_reader(klass, SV* attr, metaclass)
	479	CODE:
	480	{
a17f6313	481	RETVAL = mouse_accessor_generate(aTHX_ attr, XS_Mouse_reader);
646c0371	482	}
	483	OUTPUT:
	484	RETVAL
	485
	486	CV*
	487	_generate_writer(klass, SV* attr, metaclass)
	488	CODE:
	489	{
a17f6313	490	RETVAL = mouse_accessor_generate(aTHX_ attr, XS_Mouse_writer);
646c0371	491	}
	492	OUTPUT:
	493	RETVAL
	494
	495	CV*
	496	_generate_clearer(klass, SV* attr, metaclass)
	497	CODE:
	498	{
06afbf31	499	SV* const slot = mcall0(attr, mouse_name);
646c0371	500	STRLEN len;
646c0371	501	const char* const pv = SvPV_const(slot, len);
a17f6313	502	RETVAL = mouse_simple_accessor_generate(aTHX_ NULL, pv, len, XS_Mouse_simple_clearer, NULL, 0);
646c0371	503	}
	504	OUTPUT:
	505	RETVAL
	506
	507	CV*
	508	_generate_predicate(klass, SV* attr, metaclass)
	509	CODE:
	510	{
06afbf31	511	SV* const slot = mcall0(attr, mouse_name);
646c0371	512	STRLEN len;
646c0371	513	const char* const pv = SvPV_const(slot, len);
a17f6313	514	RETVAL = mouse_simple_accessor_generate(aTHX_ NULL, pv, len, XS_Mouse_simple_predicate, NULL, 0);
646c0371	515	}
	516	OUTPUT:
	517	RETVAL
	518