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

#include "mouse.h"

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

/* Moose XS Attribute object */
enum mouse_xa_ix_t{
    MOUSE_XA_ATTRIBUTE,
    MOUSE_XA_TC,
    MOUSE_XA_TC_CODE,

    MOUSE_XA_last
};

#define MOUSE_xa_attribute(m) MOUSE_av_at(m, MOUSE_XA_ATTRIBUTE)
#define MOUSE_xa_tc(m)        MOUSE_av_at(m, MOUSE_XA_TC)
#define MOUSE_xa_tc_code(m)   MOUSE_av_at(m, MOUSE_XA_TC_CODE)

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

enum mouse_xa_flags_t{
    MOUSEf_ATTR_HAS_TC          = 0x0001,
    MOUSEf_ATTR_HAS_DEFAULT     = 0x0002,
    MOUSEf_ATTR_HAS_BUILDER     = 0x0004,
    MOUSEf_ATTR_HAS_INITIALIZER = 0x0008, /* not used in Mouse */
    MOUSEf_ATTR_HAS_TRIGGER     = 0x0010,

    MOUSEf_ATTR_IS_LAZY         = 0x0020,
    MOUSEf_ATTR_IS_WEAK_REF     = 0x0040,
    MOUSEf_ATTR_IS_REQUIRED     = 0x0080,

    MOUSEf_ATTR_SHOULD_COERCE   = 0x0100,

    MOUSEf_ATTR_SHOULD_AUTO_DEREF
                                = 0x0200,
    MOUSEf_TC_IS_ARRAYREF       = 0x0400,
    MOUSEf_TC_IS_HASHREF        = 0x0800,

    MOUSEf_OTHER1               = 0x1000,
    MOUSEf_OTHER2               = 0x2000,
    MOUSEf_OTHER3               = 0x4000,
    MOUSEf_OTHER4               = 0x8000,

    MOUSEf_MOUSE_MASK           = 0xFFFF /* not used */
};

static MGVTBL mouse_accessor_vtbl; /* MAGIC identity */


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_instantiate_xs_accessor(pTHX_ SV* const attr, XSUBADDR_t const accessor_impl){
    SV* const slot = mcall0(attr,  mouse_name);
    AV* const xa = newAV();
    CV* xsub;
    MAGIC* mg;
    U16 flags = 0;

    sv_2mortal((SV*)xa);

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

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

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

    av_extend(xa, MOUSE_XA_last - 1);

    av_store(xa, MOUSE_XA_ATTRIBUTE, newSVsv(attr));

    /* prepare attribute status */
    /* XXX: making it lazy is a good way? */

    if(SvTRUEx(mcall0s(attr, "has_type_constraint"))){
        SV* tc;
        flags |= MOUSEf_ATTR_HAS_TC;

        ENTER;
        SAVETMPS;

        tc = mcall0s(attr, "type_constraint");
        av_store(xa, MOUSE_XA_TC, newSVsv(tc));

        if(SvTRUEx(mcall0s(attr, "should_auto_deref"))){
            flags |= MOUSEf_ATTR_SHOULD_AUTO_DEREF;
            if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("ArrayRef", SVs_TEMP))) ){
                flags |= MOUSEf_TC_IS_ARRAYREF;
            }
            else if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("HashRef", SVs_TEMP))) ){
                flags |= MOUSEf_TC_IS_HASHREF;
            }
            else{
                mouse_throw_error(attr, tc,
                    "Can not auto de-reference the type constraint '%"SVf"'",
                        mcall0(tc, mouse_name));
            }
        }

        if(SvTRUEx(mcall0s(attr, "should_coerce"))){
            flags |= MOUSEf_ATTR_SHOULD_COERCE;
        }

        FREETMPS;
        LEAVE;
    }

    if(SvTRUEx(mcall0s(attr, "has_trigger"))){
        flags |= MOUSEf_ATTR_HAS_TRIGGER;
    }

    if(SvTRUEx(mcall0s(attr, "is_lazy"))){
        flags |= MOUSEf_ATTR_IS_LAZY;

        if(SvTRUEx(mcall0s(attr, "has_builder"))){
            flags |= MOUSEf_ATTR_HAS_BUILDER;
        }
        else if(SvTRUEx(mcall0s(attr, "has_default"))){
            flags |= MOUSEf_ATTR_HAS_DEFAULT;
        }
    }

    if(SvTRUEx(mcall0s(attr, "is_weak_ref"))){
        flags |= MOUSEf_ATTR_IS_WEAK_REF;
    }

    if(SvTRUEx(mcall0s(attr, "is_required"))){
        flags |= MOUSEf_ATTR_IS_REQUIRED;
    }

    MOUSE_mg_flags(mg) = flags;

    return xsub;
}

static SV*
mouse_apply_type_constraint(pTHX_ AV* const xa, SV* value, U16 const flags){
    SV* const tc = MOUSE_xa_tc(xa);
    SV* tc_code;

    if(flags & MOUSEf_ATTR_SHOULD_COERCE){
          value = mcall1s(tc, "coerce", value);
    }

    if(!SvOK(MOUSE_xa_tc_code(xa))){
        tc_code = mcall0s(tc, "_compiled_type_constraint");
        av_store(xa, MOUSE_XA_TC_CODE, newSVsv(tc_code));

        if(!IsCodeRef(tc_code)){
            mouse_throw_error(MOUSE_xa_attribute(xa), tc, "Not a CODE reference");
        }
    }
    else{
        tc_code = MOUSE_xa_tc_code(xa);
    }

    if(!mouse_tc_check(aTHX_ tc_code, value)){
        mouse_throw_error(MOUSE_xa_attribute(xa), value,
            "Attribute (%"SVf") does not pass the type constraint because: %"SVf,
                mcall0(MOUSE_xa_attribute(xa), mouse_name),
                mcall1s(tc, "get_message", value));
    }

    return value;
}

#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 if(flags & MOUSEf_TC_IS_HASHREF){
        HV* hv;
        HE* he;

        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* const slot  = MOUSE_mg_slot(mg);
    SV* value;

    value = get_slot(self, slot);

    /* check_lazy */
    if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
        AV* const xa   = MOUSE_mg_xa(mg);
        SV* const attr = MOUSE_xa_attribute(xa);

        /* get default value by $attr->builder or $attr->default */
        if(flags & MOUSEf_ATTR_HAS_BUILDER){
            SV* const builder = mcall0s(attr, "builder");
            value = mcall0(self, builder);
        }
        else {
            value = mcall0s(attr, "default");

            if(IsCodeRef(value)){
                value = mcall0(self, value);
            }
        }

        /* apply coerce and type constraint */
        if(flags & MOUSEf_ATTR_HAS_TC){
            value = mouse_apply_type_constraint(aTHX_ xa, value, flags);
        }

        /* store value to slot */
        value = set_slot(self, slot, value);
    }

    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_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
    }

    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;

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

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

    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");
    }
}


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");
    }

    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");
    }

    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_install_simple_accessor(pTHX_ const char* const fq_name, const char* const key, I32 const keylen, XSUBADDR_t const accessor_impl){
    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, NULL, 0);
    SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */

    /* 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;
    SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
    SV* value;

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

    value = get_slot(self, slot);
    ST(0) = value ? value : &PL_sv_undef;
    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 for '%"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 for '%"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 for '%"SVf"'", slot);
    }

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

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

SV*
mouse_instance_create(pTHX_ HV* const stash) {
    assert(stash);
    return sv_bless( newRV_noinc((SV*)newHV()), stash );
}

SV*
mouse_instance_clone(pTHX_ SV* const instance) {
    HV* proto;
    assert(instance);

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

bool
mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
    assert(instance);
    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(instance);
    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(instance);
    assert(slot);
    assert(value);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
    sv = HeVAL(he);
    sv_setsv_mg(sv, value);
    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(instance);
    assert(slot);
    CHECK_INSTANCE(instance);
    he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
    if(he){
        sv_rvweaken(HeVAL(he));
    }
}
\r
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_instantiate_xs_accessor(aTHX_ attr, XS_Mouse_accessor);
}
OUTPUT:
    RETVAL

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

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

CV*
_generate_clearer(klass, SV* attr, metaclass)
CODE:
{
    SV* const slot = mcall0s(attr, "name");
    STRLEN len;
    const char* const pv = SvPV_const(slot, len);
    RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, XS_Mouse_simple_clearer);
}
OUTPUT:
    RETVAL

CV*
_generate_predicate(klass, SV* attr, metaclass)
CODE:
{
    SV* const slot = mcall0s(attr, "name");
    STRLEN len;
    const char* const pv = SvPV_const(slot, len);
    RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, XS_Mouse_simple_predicate);
}
OUTPUT:
    RETVAL
Commit	Line	Data
646c0371	1	#include "mouse.h"
	2
	3	#define CHECK_INSTANCE(instance) STMT_START{ \
	4	if(!(SvROK(instance) && SvTYPE(SvRV(instance)) == SVt_PVHV)){ \
76770976	5	croak("Invalid object instance"); \
646c0371	6	} \
	7	} STMT_END
	8
	9	/* Moose XS Attribute object */
	10	enum mouse_xa_ix_t{
	11	MOUSE_XA_ATTRIBUTE,
	12	MOUSE_XA_TC,
	13	MOUSE_XA_TC_CODE,
	14
	15	MOUSE_XA_last
	16	};
	17
	18	#define MOUSE_xa_attribute(m) MOUSE_av_at(m, MOUSE_XA_ATTRIBUTE)
	19	#define MOUSE_xa_tc(m) MOUSE_av_at(m, MOUSE_XA_TC)
	20	#define MOUSE_xa_tc_code(m) MOUSE_av_at(m, MOUSE_XA_TC_CODE)
	21
	22	#define MOUSE_mg_attribute(mg) MOUSE_xa_attribute(MOUSE_mg_xa(mg))
	23
	24	enum mouse_xa_flags_t{
	25	MOUSEf_ATTR_HAS_TC = 0x0001,
	26	MOUSEf_ATTR_HAS_DEFAULT = 0x0002,
	27	MOUSEf_ATTR_HAS_BUILDER = 0x0004,
	28	MOUSEf_ATTR_HAS_INITIALIZER = 0x0008, /* not used in Mouse */
	29	MOUSEf_ATTR_HAS_TRIGGER = 0x0010,
	30
	31	MOUSEf_ATTR_IS_LAZY = 0x0020,
	32	MOUSEf_ATTR_IS_WEAK_REF = 0x0040,
	33	MOUSEf_ATTR_IS_REQUIRED = 0x0080,
	34
	35	MOUSEf_ATTR_SHOULD_COERCE = 0x0100,
	36
	37	MOUSEf_ATTR_SHOULD_AUTO_DEREF
	38	= 0x0200,
	39	MOUSEf_TC_IS_ARRAYREF = 0x0400,
	40	MOUSEf_TC_IS_HASHREF = 0x0800,
	41
	42	MOUSEf_OTHER1 = 0x1000,
	43	MOUSEf_OTHER2 = 0x2000,
	44	MOUSEf_OTHER3 = 0x4000,
	45	MOUSEf_OTHER4 = 0x8000,
	46
	47	MOUSEf_MOUSE_MASK = 0xFFFF /* not used */
	48	};
	49
	50	static MGVTBL mouse_accessor_vtbl; /* MAGIC identity */
	51
	52
	53	SV*
	54	mouse_accessor_get_self(pTHX_ I32 const ax, I32 const items, CV* const cv) {
646c0371	55	if(items < 1){
	56	croak("Too few arguments for %s", GvNAME(CvGV(cv)));
	57	}
	58
	59	/* NOTE: If self has GETMAGIC, $self->accessor will invoke GETMAGIC
	60	* before calling methods, so SvGETMAGIC(self) is not necessarily needed here.
	61	*/
	62
76770976	63	return ST(0);
646c0371	64	}
	65
	66
	67	CV*
	68	mouse_instantiate_xs_accessor(pTHX_ SV* const attr, XSUBADDR_t const accessor_impl){
	69	SV* const slot = mcall0(attr, mouse_name);
	70	AV* const xa = newAV();
	71	CV* xsub;
	72	MAGIC* mg;
	73	U16 flags = 0;
	74
	75	sv_2mortal((SV*)xa);
	76
	77	xsub = newXS(NULL, accessor_impl, __FILE__);
	78	sv_2mortal((SV*)xsub);
	79
	80	mg = sv_magicext((SV)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, (char)xa, HEf_SVKEY);
	81
	82	/* NOTE:
	83	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
	84	*/
	85	CvXSUBANY(xsub).any_ptr = (void*)mg;
	86
	87	av_extend(xa, MOUSE_XA_last - 1);
	88
	89	av_store(xa, MOUSE_XA_ATTRIBUTE, newSVsv(attr));
	90
	91	/* prepare attribute status */
	92	/* XXX: making it lazy is a good way? */
	93
	94	if(SvTRUEx(mcall0s(attr, "has_type_constraint"))){
	95	SV* tc;
	96	flags \|= MOUSEf_ATTR_HAS_TC;
	97
	98	ENTER;
	99	SAVETMPS;
	100
	101	tc = mcall0s(attr, "type_constraint");
	102	av_store(xa, MOUSE_XA_TC, newSVsv(tc));
	103
	104	if(SvTRUEx(mcall0s(attr, "should_auto_deref"))){
	105	flags \|= MOUSEf_ATTR_SHOULD_AUTO_DEREF;
	106	if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("ArrayRef", SVs_TEMP))) ){
	107	flags \|= MOUSEf_TC_IS_ARRAYREF;
	108	}
	109	else if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("HashRef", SVs_TEMP))) ){
	110	flags \|= MOUSEf_TC_IS_HASHREF;
	111	}
	112	else{
	113	mouse_throw_error(attr, tc,
	114	"Can not auto de-reference the type constraint '%"SVf"'",
	115	mcall0(tc, mouse_name));
	116	}
	117	}
	118
	119	if(SvTRUEx(mcall0s(attr, "should_coerce"))){
	120	flags \|= MOUSEf_ATTR_SHOULD_COERCE;
	121	}
	122
	123	FREETMPS;
	124	LEAVE;
	125	}
	126
	127	if(SvTRUEx(mcall0s(attr, "has_trigger"))){
128	flags \|= MOUSEf_ATTR_HAS_TRIGGER;
129	}
130
131	if(SvTRUEx(mcall0s(attr, "is_lazy"))){
132	flags \|= MOUSEf_ATTR_IS_LAZY;
133
134	if(SvTRUEx(mcall0s(attr, "has_builder"))){
135	flags \|= MOUSEf_ATTR_HAS_BUILDER;
136	}
137	else if(SvTRUEx(mcall0s(attr, "has_default"))){
138	flags \|= MOUSEf_ATTR_HAS_DEFAULT;
139	}
140	}
141
142	if(SvTRUEx(mcall0s(attr, "is_weak_ref"))){
143	flags \|= MOUSEf_ATTR_IS_WEAK_REF;
144	}
145
146	if(SvTRUEx(mcall0s(attr, "is_required"))){
147	flags \|= MOUSEf_ATTR_IS_REQUIRED;
148	}
149
150	MOUSE_mg_flags(mg) = flags;
151
152	return xsub;
153	}
154
155	static SV*
156	mouse_apply_type_constraint(pTHX_ AV* const xa, SV* value, U16 const flags){
157	SV* const tc = MOUSE_xa_tc(xa);
158	SV* tc_code;
159
160	if(flags & MOUSEf_ATTR_SHOULD_COERCE){
161	value = mcall1s(tc, "coerce", value);
162	}
163
164	if(!SvOK(MOUSE_xa_tc_code(xa))){
646c0371	165	tc_code = mcall0s(tc, "_compiled_type_constraint");
d33d8840	166	av_store(xa, MOUSE_XA_TC_CODE, newSVsv(tc_code));
263728b5	167
80aa5731	168	if(!IsCodeRef(tc_code)){
d33d8840	169	mouse_throw_error(MOUSE_xa_attribute(xa), tc, "Not a CODE reference");
646c0371	170	}
	171	}
	172	else{
	173	tc_code = MOUSE_xa_tc_code(xa);
	174	}
	175
	176	if(!mouse_tc_check(aTHX_ tc_code, value)){
	177	mouse_throw_error(MOUSE_xa_attribute(xa), value,
	178	"Attribute (%"SVf") does not pass the type constraint because: %"SVf,
	179	mcall0(MOUSE_xa_attribute(xa), mouse_name),
	180	mcall1s(tc, "get_message", value));
	181	}
	182
	183	return value;
	184	}
	185
208ffaeb	186	#define PUSH_VALUE(value, flags) STMT_START { \
	187	if((flags) & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY){ \
	188	mouse_push_values(aTHX_ value, (flags)); \
	189	} \
	190	else{ \
	191	dSP; \
	192	XPUSHs(value ? value : &PL_sv_undef); \
	193	PUTBACK; \
	194	} \
	195	} STMT_END \
646c0371	196
	197	/* pushes return values, does auto-deref if needed */
	198	static void
	199	mouse_push_values(pTHX_ SV* const value, U16 const flags){
	200	dSP;
	201
208ffaeb	202	assert( flags & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY );
646c0371	203
208ffaeb	204	if(!(value && SvOK(value))){
	205	return;
	206	}
646c0371	207
208ffaeb	208	if(flags & MOUSEf_TC_IS_ARRAYREF){
80aa5731	209	AV* av;
208ffaeb	210	I32 len;
208ffaeb	211	I32 i;
646c0371	212
80aa5731	213	if(!IsArrayRef(value)){
208ffaeb	214	croak("Mouse-panic: Not an ARRAY reference");
646c0371	215	}
646c0371	216
80aa5731	217	av = (AV*)SvRV(value);
208ffaeb	218	len = av_len(av) + 1;
	219	EXTEND(SP, len);
	220	for(i = 0; i < len; i++){
	221	SV** const svp = av_fetch(av, i, FALSE);
	222	PUSHs(svp ? *svp : &PL_sv_undef);
646c0371	223	}
646c0371	224	}
208ffaeb	225	else if(flags & MOUSEf_TC_IS_HASHREF){
80aa5731	226	HV* hv;
208ffaeb	227	HE* he;
208ffaeb	228
80aa5731	229	if(!IsHashRef(value)){
208ffaeb	230	croak("Mouse-panic: Not a HASH reference");
	231	}
	232
80aa5731	233	hv = (HV*)SvRV(value);
208ffaeb	234	hv_iterinit(hv);
	235	while((he = hv_iternext(hv))){
	236	EXTEND(SP, 2);
	237	PUSHs(hv_iterkeysv(he));
	238	PUSHs(hv_iterval(hv, he));
	239	}
646c0371	240	}
	241
	242	PUTBACK;
	243	}
	244
	245	static void
	246	mouse_attr_get(pTHX_ SV* const self, MAGIC* const mg){
	247	U16 const flags = MOUSE_mg_flags(mg);
	248	SV* const slot = MOUSE_mg_slot(mg);
	249	SV* value;
	250
6fe2272b	251	value = get_slot(self, slot);
646c0371	252
	253	/* check_lazy */
	254	if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
8fa5f9b8	255	AV* const xa = MOUSE_mg_xa(mg);
646c0371	256	SV* const attr = MOUSE_xa_attribute(xa);
646c0371	257
8fa5f9b8	258	/* get default value by $attr->builder or $attr->default */
	259	if(flags & MOUSEf_ATTR_HAS_BUILDER){
	260	SV* const builder = mcall0s(attr, "builder");
	261	value = mcall0(self, builder);
	262	}
	263	else {
646c0371	264	value = mcall0s(attr, "default");
646c0371	265
80aa5731	266	if(IsCodeRef(value)){
646c0371	267	value = mcall0(self, value);
	268	}
	269	}
646c0371	270
	271	/* apply coerce and type constraint */
	272	if(flags & MOUSEf_ATTR_HAS_TC){
	273	value = mouse_apply_type_constraint(aTHX_ xa, value, flags);
	274	}
	275
	276	/* store value to slot */
6fe2272b	277	value = set_slot(self, slot, value);
646c0371	278	}
646c0371	279
208ffaeb	280	PUSH_VALUE(value, flags);
646c0371	281	}
	282
	283	static void
	284	mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
	285	U16 const flags = MOUSE_mg_flags(mg);
	286	SV* const slot = MOUSE_mg_slot(mg);
	287
	288	if(flags & MOUSEf_ATTR_HAS_TC){
	289	value = mouse_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
	290	}
	291
6fe2272b	292	set_slot(self, slot, value);
646c0371	293
646c0371	294	if(flags & MOUSEf_ATTR_IS_WEAK_REF){
6fe2272b	295	weaken_slot(self, slot);
646c0371	296	}
	297
	298	if(flags & MOUSEf_ATTR_HAS_TRIGGER){
	299	SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
	300	dSP;
	301
	302	PUSHMARK(SP);
	303	EXTEND(SP, 2);
	304	PUSHs(self);
	305	PUSHs(value);
	306
	307	PUTBACK;
	308	call_sv(trigger, G_VOID \| G_DISCARD);
	309	/* need not SPAGAIN */
	310	}
	311
208ffaeb	312	PUSH_VALUE(value, flags);
646c0371	313	}
646c0371	314
30e11004	315	XS(XS_Mouse_accessor)
646c0371	316	{
	317	dVAR; dXSARGS;
	318	dMOUSE_self;
	319	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	320
	321	SP -= items; /* PPCODE */
	322	PUTBACK;
	323
	324	if(items == 1){ /* reader */
	325	mouse_attr_get(aTHX_ self, mg);
	326	}
	327	else if (items == 2){ /* writer */
	328	mouse_attr_set(aTHX_ self, mg, ST(1));
	329	}
	330	else{
	331	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	332	"Expected exactly one or two argument for an accessor");
	333	}
	334	}
	335
	336
30e11004	337	XS(XS_Mouse_reader)
646c0371	338	{
	339	dVAR; dXSARGS;
	340	dMOUSE_self;
	341	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	342
	343	if (items != 1) {
	344	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	345	"Cannot assign a value to a read-only accessor");
	346	}
	347
	348	SP -= items; /* PPCODE */
	349	PUTBACK;
	350
	351	mouse_attr_get(aTHX_ self, mg);
	352	}
	353
30e11004	354	XS(XS_Mouse_writer)
646c0371	355	{
	356	dVAR; dXSARGS;
	357	dMOUSE_self;
	358	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	359
	360	if (items != 2) {
	361	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	362	"Too few arguments for a write-only accessor");
	363	}
	364
	365	SP -= items; /* PPCODE */
	366	PUTBACK;
	367
	368	mouse_attr_set(aTHX_ self, mg, ST(1));
	369	}
	370
	371	/* simple accessors */
	372
	373	/*
	374	static MAGIC*
	375	mouse_accessor_get_mg(pTHX_ CV* const xsub){
	376	return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
	377	}
	378	*/
	379
	380	CV*
	381	mouse_install_simple_accessor(pTHX_ const char* const fq_name, const char* const key, I32 const keylen, XSUBADDR_t const accessor_impl){
	382	CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
	383	SV* const slot = newSVpvn_share(key, keylen, 0U);
	384	MAGIC* mg;
	385
	386	if(!fq_name){
	387	/* anonymous xsubs need sv_2mortal */
	388	sv_2mortal((SV*)xsub);
	389	}
	390
	391	mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, NULL, 0);
	392	SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */
	393
	394	/* NOTE:
	395	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
	396	*/
	397	CvXSUBANY(xsub).any_ptr = (void*)mg;
	398
	399	return xsub;
	400	}
	401
30e11004	402	XS(XS_Mouse_simple_reader)
646c0371	403	{
	404	dVAR; dXSARGS;
	405	dMOUSE_self;
	406	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	407	SV* value;
	408
	409	if (items != 1) {
	410	croak("Expected exactly one argument for a reader for '%"SVf"'", slot);
	411	}
	412
6fe2272b	413	value = get_slot(self, slot);
646c0371	414	ST(0) = value ? value : &PL_sv_undef;
	415	XSRETURN(1);
	416	}
	417
	418
30e11004	419	XS(XS_Mouse_simple_writer)
646c0371	420	{
	421	dVAR; dXSARGS;
	422	dMOUSE_self;
	423	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	424
	425	if (items != 2) {
	426	croak("Expected exactly two argument for a writer for '%"SVf"'", slot);
	427	}
	428
6fe2272b	429	ST(0) = set_slot(self, slot, ST(1));
646c0371	430	XSRETURN(1);
	431	}
	432
30e11004	433	XS(XS_Mouse_simple_clearer)
646c0371	434	{
	435	dVAR; dXSARGS;
	436	dMOUSE_self;
	437	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	438	SV* value;
	439
	440	if (items != 1) {
	441	croak("Expected exactly one argument for a clearer for '%"SVf"'", slot);
	442	}
	443
6fe2272b	444	value = delete_slot(self, slot);
646c0371	445	ST(0) = value ? value : &PL_sv_undef;
	446	XSRETURN(1);
	447	}
	448
30e11004	449	XS(XS_Mouse_simple_predicate)
646c0371	450	{
	451	dVAR; dXSARGS;
	452	dMOUSE_self;
	453	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	454
	455	if (items != 1) {
	456	croak("Expected exactly one argument for a predicate for '%"SVf"'", slot);
	457	}
	458
6fe2272b	459	ST(0) = boolSV( has_slot(self, slot) );
646c0371	460	XSRETURN(1);
	461	}
	462
76770976	463	/* simple instance slot accessor (or Mouse::Meta::Instance) */
646c0371	464
	465	SV*
	466	mouse_instance_create(pTHX_ HV* const stash) {
	467	assert(stash);
	468	return sv_bless( newRV_noinc((SV*)newHV()), stash );
	469	}
	470
	471	SV*
	472	mouse_instance_clone(pTHX_ SV* const instance) {
	473	HV* proto;
	474	assert(instance);
	475
	476	CHECK_INSTANCE(instance);
	477	proto = newHVhv((HV*)SvRV(instance));
	478	return sv_bless( newRV_noinc((SV*)proto), SvSTASH(SvRV(instance)) );
	479	}
	480
	481	bool
	482	mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
	483	assert(instance);
	484	assert(slot);
	485	CHECK_INSTANCE(instance);
	486	return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
	487	}
	488
	489	SV*
	490	mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
	491	HE* he;
	492	assert(instance);
	493	assert(slot);
	494	CHECK_INSTANCE(instance);
	495	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
	496	return he ? HeVAL(he) : NULL;
	497	}
	498
	499	SV*
	500	mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
	501	HE* he;
	502	SV* sv;
	503	assert(instance);
	504	assert(slot);
	505	assert(value);
	506	CHECK_INSTANCE(instance);
	507	he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
	508	sv = HeVAL(he);
	509	sv_setsv_mg(sv, value);
	510	return sv;
	511	}
	512
	513	SV*
	514	mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
	515	assert(instance);
	516	assert(slot);
	517	CHECK_INSTANCE(instance);
	518	return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
	519	}
	520
	521	void
	522	mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
	523	HE* he;
	524	assert(instance);
	525	assert(slot);
	526	CHECK_INSTANCE(instance);
	527	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
528	if(he){
529	sv_rvweaken(HeVAL(he));
530	}
531	}
532	\r
533	MODULE = Mouse::Meta::Method::Accessor::XS PACKAGE = Mouse::Meta::Method::Accessor::XS
534
535	PROTOTYPES: DISABLE
536	VERSIONCHECK: DISABLE
537
538	CV*
539	_generate_accessor(klass, SV* attr, metaclass)
540	CODE:
541	{
30e11004	542	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, XS_Mouse_accessor);
646c0371	543	}
	544	OUTPUT:
	545	RETVAL
	546
	547	CV*
	548	_generate_reader(klass, SV* attr, metaclass)
	549	CODE:
	550	{
30e11004	551	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, XS_Mouse_reader);
646c0371	552	}
	553	OUTPUT:
	554	RETVAL
	555
	556	CV*
	557	_generate_writer(klass, SV* attr, metaclass)
	558	CODE:
	559	{
30e11004	560	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, XS_Mouse_writer);
646c0371	561	}
	562	OUTPUT:
	563	RETVAL
	564
	565	CV*
	566	_generate_clearer(klass, SV* attr, metaclass)
	567	CODE:
	568	{
	569	SV* const slot = mcall0s(attr, "name");
	570	STRLEN len;
	571	const char* const pv = SvPV_const(slot, len);
30e11004	572	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, XS_Mouse_simple_clearer);
646c0371	573	}
	574	OUTPUT:
	575	RETVAL
	576
	577	CV*
	578	_generate_predicate(klass, SV* attr, metaclass)
	579	CODE:
	580	{
	581	SV* const slot = mcall0s(attr, "name");
	582	STRLEN len;
	583	const char* const pv = SvPV_const(slot, len);
30e11004	584	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, XS_Mouse_simple_predicate);
646c0371	585	}
	586	OUTPUT:
	587	RETVAL
	588