[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) {
    SV* self;

    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))){
        XS(XS_Mouse__Util__TypeConstraints_Item); /* prototype defined in Mouse.xs */

        tc_code = mcall0s(tc, "_compiled_type_constraint");

        if(SvROK(tc_code) && SvTYPE(SvRV(tc_code))
            && CvXSUB((CV*)SvRV(tc_code)) == XS_Mouse__Util__TypeConstraints_Item){
            /* built-in type constraints */
            mouse_tc const id = CvXSUBANY((CV*)SvRV(tc_code)).any_i32;
            av_store(xa, MOUSE_XA_TC_CODE, newSViv(id));
        }
        else{
            av_store(xa, MOUSE_XA_TC_CODE, newSVsv(tc_code));
        }
    }
    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* const av = (AV*)SvRV(value);
        I32 len;
        I32 i;

        if(SvTYPE(av) != SVt_PVAV){
            croak("Mouse-panic: Not an ARRAY reference");
        }

        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* const hv = (HV*)SvRV(value);
        HE* he;

        if(SvTYPE(hv) != SVt_PVHV){
            croak("Mouse-panic: Not a HASH reference");
        }

        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 = mouse_instance_get_slot(aTHX_ 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->default or $attr->builder */
        if(flags & MOUSEf_ATTR_HAS_DEFAULT){
            value = mcall0s(attr, "default");

            if(SvROK(value) && SvTYPE(SvRV(value)) == SVt_PVCV){
                value = mcall0(self, value);
            }
        }
        else if(flags & MOUSEf_ATTR_HAS_BUILDER){
            SV* const builder = mcall0s(attr, "builder");
            value = mcall0(self, builder);
        }

        if(!value){
            value = sv_newmortal();
        }

        /* 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 = mouse_instance_set_slot(aTHX_ 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);
    }

    mouse_instance_set_slot(aTHX_ self, slot, value);

    if(flags & MOUSEf_ATTR_IS_WEAK_REF){
        mouse_instance_weaken_slot(aTHX_ 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(mouse_xs_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(mouse_xs_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(mouse_xs_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(mouse_xs_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 = mouse_instance_get_slot(aTHX_ self, slot);
    ST(0) = value ? value : &PL_sv_undef;
    XSRETURN(1);
}


XS(mouse_xs_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) = mouse_instance_set_slot(aTHX_ self, slot, ST(1));
    XSRETURN(1);
}

XS(mouse_xs_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 = mouse_instance_delete_slot(aTHX_ self, slot);
    ST(0) = value ? value : &PL_sv_undef;
    XSRETURN(1);
}

XS(mouse_xs_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( mouse_instance_has_slot(aTHX_ 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, mouse_xs_accessor);
}
OUTPUT:
    RETVAL

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

CV*
_generate_writer(klass, SV* attr, metaclass)
CODE:
{
    RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_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, mouse_xs_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, mouse_xs_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) {
	55	SV* self;
	56
	57	if(items < 1){
	58	croak("Too few arguments for %s", GvNAME(CvGV(cv)));
	59	}
	60
	61	/* NOTE: If self has GETMAGIC, $self->accessor will invoke GETMAGIC
	62	* before calling methods, so SvGETMAGIC(self) is not necessarily needed here.
	63	*/
	64
76770976	65	return ST(0);
646c0371	66	}
	67
	68
	69	CV*
	70	mouse_instantiate_xs_accessor(pTHX_ SV* const attr, XSUBADDR_t const accessor_impl){
	71	SV* const slot = mcall0(attr, mouse_name);
	72	AV* const xa = newAV();
	73	CV* xsub;
	74	MAGIC* mg;
	75	U16 flags = 0;
	76
	77	sv_2mortal((SV*)xa);
	78
	79	xsub = newXS(NULL, accessor_impl, __FILE__);
	80	sv_2mortal((SV*)xsub);
	81
	82	mg = sv_magicext((SV)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, (char)xa, HEf_SVKEY);
	83
	84	/* NOTE:
	85	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
	86	*/
	87	CvXSUBANY(xsub).any_ptr = (void*)mg;
	88
	89	av_extend(xa, MOUSE_XA_last - 1);
	90
	91	av_store(xa, MOUSE_XA_ATTRIBUTE, newSVsv(attr));
	92
	93	/* prepare attribute status */
	94	/* XXX: making it lazy is a good way? */
	95
	96	if(SvTRUEx(mcall0s(attr, "has_type_constraint"))){
	97	SV* tc;
	98	flags \|= MOUSEf_ATTR_HAS_TC;
	99
	100	ENTER;
	101	SAVETMPS;
	102
	103	tc = mcall0s(attr, "type_constraint");
	104	av_store(xa, MOUSE_XA_TC, newSVsv(tc));
	105
	106	if(SvTRUEx(mcall0s(attr, "should_auto_deref"))){
	107	flags \|= MOUSEf_ATTR_SHOULD_AUTO_DEREF;
	108	if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("ArrayRef", SVs_TEMP))) ){
	109	flags \|= MOUSEf_TC_IS_ARRAYREF;
	110	}
	111	else if( SvTRUEx(mcall1s(tc, "is_a_type_of", newSVpvs_flags("HashRef", SVs_TEMP))) ){
	112	flags \|= MOUSEf_TC_IS_HASHREF;
	113	}
	114	else{
	115	mouse_throw_error(attr, tc,
	116	"Can not auto de-reference the type constraint '%"SVf"'",
	117	mcall0(tc, mouse_name));
	118	}
	119	}
	120
	121	if(SvTRUEx(mcall0s(attr, "should_coerce"))){
	122	flags \|= MOUSEf_ATTR_SHOULD_COERCE;
	123	}
	124
	125	FREETMPS;
	126	LEAVE;
	127	}
	128
	129	if(SvTRUEx(mcall0s(attr, "has_trigger"))){
130	flags \|= MOUSEf_ATTR_HAS_TRIGGER;
131	}
132
133	if(SvTRUEx(mcall0s(attr, "is_lazy"))){
134	flags \|= MOUSEf_ATTR_IS_LAZY;
135
136	if(SvTRUEx(mcall0s(attr, "has_builder"))){
137	flags \|= MOUSEf_ATTR_HAS_BUILDER;
138	}
139	else if(SvTRUEx(mcall0s(attr, "has_default"))){
140	flags \|= MOUSEf_ATTR_HAS_DEFAULT;
141	}
142	}
143
144	if(SvTRUEx(mcall0s(attr, "is_weak_ref"))){
145	flags \|= MOUSEf_ATTR_IS_WEAK_REF;
146	}
147
148	if(SvTRUEx(mcall0s(attr, "is_required"))){
149	flags \|= MOUSEf_ATTR_IS_REQUIRED;
150	}
151
152	MOUSE_mg_flags(mg) = flags;
153
154	return xsub;
155	}
156
157	static SV*
158	mouse_apply_type_constraint(pTHX_ AV* const xa, SV* value, U16 const flags){
159	SV* const tc = MOUSE_xa_tc(xa);
160	SV* tc_code;
161
162	if(flags & MOUSEf_ATTR_SHOULD_COERCE){
163	value = mcall1s(tc, "coerce", value);
164	}
165
166	if(!SvOK(MOUSE_xa_tc_code(xa))){
167	XS(XS_Mouse__Util__TypeConstraints_Item); /* prototype defined in Mouse.xs */
168
169	tc_code = mcall0s(tc, "_compiled_type_constraint");
170
171	if(SvROK(tc_code) && SvTYPE(SvRV(tc_code))
172	&& CvXSUB((CV*)SvRV(tc_code)) == XS_Mouse__Util__TypeConstraints_Item){
173	/* built-in type constraints */
174	mouse_tc const id = CvXSUBANY((CV*)SvRV(tc_code)).any_i32;
175	av_store(xa, MOUSE_XA_TC_CODE, newSViv(id));
176	}
177	else{
178	av_store(xa, MOUSE_XA_TC_CODE, newSVsv(tc_code));
179	}
180	}
181	else{
182	tc_code = MOUSE_xa_tc_code(xa);
183	}
184
185	if(!mouse_tc_check(aTHX_ tc_code, value)){
186	mouse_throw_error(MOUSE_xa_attribute(xa), value,
187	"Attribute (%"SVf") does not pass the type constraint because: %"SVf,
188	mcall0(MOUSE_xa_attribute(xa), mouse_name),
189	mcall1s(tc, "get_message", value));
190	}
191
192	return value;
193	}
194
208ffaeb	195	#define PUSH_VALUE(value, flags) STMT_START { \
	196	if((flags) & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY){ \
	197	mouse_push_values(aTHX_ value, (flags)); \
	198	} \
	199	else{ \
	200	dSP; \
	201	XPUSHs(value ? value : &PL_sv_undef); \
	202	PUTBACK; \
	203	} \
	204	} STMT_END \
646c0371	205
	206	/* pushes return values, does auto-deref if needed */
	207	static void
	208	mouse_push_values(pTHX_ SV* const value, U16 const flags){
	209	dSP;
	210
208ffaeb	211	assert( flags & MOUSEf_ATTR_SHOULD_AUTO_DEREF && GIMME_V == G_ARRAY );
646c0371	212
208ffaeb	213	if(!(value && SvOK(value))){
	214	return;
	215	}
646c0371	216
208ffaeb	217	if(flags & MOUSEf_TC_IS_ARRAYREF){
	218	AV* const av = (AV*)SvRV(value);
	219	I32 len;
	220	I32 i;
646c0371	221
208ffaeb	222	if(SvTYPE(av) != SVt_PVAV){
208ffaeb	223	croak("Mouse-panic: Not an ARRAY reference");
646c0371	224	}
646c0371	225
208ffaeb	226	len = av_len(av) + 1;
	227	EXTEND(SP, len);
	228	for(i = 0; i < len; i++){
	229	SV** const svp = av_fetch(av, i, FALSE);
	230	PUSHs(svp ? *svp : &PL_sv_undef);
646c0371	231	}
646c0371	232	}
208ffaeb	233	else if(flags & MOUSEf_TC_IS_HASHREF){
	234	HV* const hv = (HV*)SvRV(value);
	235	HE* he;
	236
	237	if(SvTYPE(hv) != SVt_PVHV){
	238	croak("Mouse-panic: Not a HASH reference");
	239	}
	240
	241	hv_iterinit(hv);
	242	while((he = hv_iternext(hv))){
	243	EXTEND(SP, 2);
	244	PUSHs(hv_iterkeysv(he));
	245	PUSHs(hv_iterval(hv, he));
	246	}
646c0371	247	}
	248
	249	PUTBACK;
	250	}
	251
	252	static void
	253	mouse_attr_get(pTHX_ SV* const self, MAGIC* const mg){
	254	U16 const flags = MOUSE_mg_flags(mg);
	255	SV* const slot = MOUSE_mg_slot(mg);
	256	SV* value;
	257
	258	value = mouse_instance_get_slot(aTHX_ self, slot);
	259
	260	/* check_lazy */
	261	if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
	262	AV* const xa = MOUSE_mg_xa(mg);
	263	SV* const attr = MOUSE_xa_attribute(xa);
	264
	265	/* get default value by $attr->default or $attr->builder */
	266	if(flags & MOUSEf_ATTR_HAS_DEFAULT){
	267	value = mcall0s(attr, "default");
	268
	269	if(SvROK(value) && SvTYPE(SvRV(value)) == SVt_PVCV){
	270	value = mcall0(self, value);
	271	}
	272	}
	273	else if(flags & MOUSEf_ATTR_HAS_BUILDER){
	274	SV* const builder = mcall0s(attr, "builder");
	275	value = mcall0(self, builder);
	276	}
	277
	278	if(!value){
	279	value = sv_newmortal();
	280	}
	281
	282	/* apply coerce and type constraint */
	283	if(flags & MOUSEf_ATTR_HAS_TC){
	284	value = mouse_apply_type_constraint(aTHX_ xa, value, flags);
	285	}
	286
	287	/* store value to slot */
	288	value = mouse_instance_set_slot(aTHX_ self, slot, value);
	289	}
	290
208ffaeb	291	PUSH_VALUE(value, flags);
646c0371	292	}
	293
	294	static void
	295	mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
	296	U16 const flags = MOUSE_mg_flags(mg);
	297	SV* const slot = MOUSE_mg_slot(mg);
	298
	299	if(flags & MOUSEf_ATTR_HAS_TC){
	300	value = mouse_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
	301	}
	302
	303	mouse_instance_set_slot(aTHX_ self, slot, value);
	304
	305	if(flags & MOUSEf_ATTR_IS_WEAK_REF){
	306	mouse_instance_weaken_slot(aTHX_ self, slot);
	307	}
	308
	309	if(flags & MOUSEf_ATTR_HAS_TRIGGER){
	310	SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
	311	dSP;
	312
	313	PUSHMARK(SP);
	314	EXTEND(SP, 2);
	315	PUSHs(self);
	316	PUSHs(value);
	317
	318	PUTBACK;
	319	call_sv(trigger, G_VOID \| G_DISCARD);
	320	/* need not SPAGAIN */
	321	}
	322
208ffaeb	323	PUSH_VALUE(value, flags);
646c0371	324	}
	325
	326	XS(mouse_xs_accessor)
	327	{
	328	dVAR; dXSARGS;
	329	dMOUSE_self;
	330	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	331
	332	SP -= items; /* PPCODE */
	333	PUTBACK;
	334
	335	if(items == 1){ /* reader */
	336	mouse_attr_get(aTHX_ self, mg);
	337	}
	338	else if (items == 2){ /* writer */
	339	mouse_attr_set(aTHX_ self, mg, ST(1));
	340	}
	341	else{
	342	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	343	"Expected exactly one or two argument for an accessor");
	344	}
	345	}
	346
	347
	348	XS(mouse_xs_reader)
	349	{
	350	dVAR; dXSARGS;
	351	dMOUSE_self;
	352	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	353
	354	if (items != 1) {
	355	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	356	"Cannot assign a value to a read-only accessor");
	357	}
	358
	359	SP -= items; /* PPCODE */
	360	PUTBACK;
	361
	362	mouse_attr_get(aTHX_ self, mg);
	363	}
	364
	365	XS(mouse_xs_writer)
	366	{
	367	dVAR; dXSARGS;
	368	dMOUSE_self;
	369	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	370
	371	if (items != 2) {
	372	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	373	"Too few arguments for a write-only accessor");
	374	}
	375
	376	SP -= items; /* PPCODE */
	377	PUTBACK;
	378
	379	mouse_attr_set(aTHX_ self, mg, ST(1));
	380	}
	381
	382	/* simple accessors */
	383
	384	/*
	385	static MAGIC*
	386	mouse_accessor_get_mg(pTHX_ CV* const xsub){
	387	return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
388	}
389	*/
390
391	CV*
392	mouse_install_simple_accessor(pTHX_ const char* const fq_name, const char* const key, I32 const keylen, XSUBADDR_t const accessor_impl){
393	CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
394	SV* const slot = newSVpvn_share(key, keylen, 0U);
395	MAGIC* mg;
396
397	if(!fq_name){
398	/* anonymous xsubs need sv_2mortal */
399	sv_2mortal((SV*)xsub);
400	}
401
402	mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, NULL, 0);
403	SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */
404
405	/* NOTE:
406	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
407	*/
408	CvXSUBANY(xsub).any_ptr = (void*)mg;
409
410	return xsub;
411	}
412
413	XS(mouse_xs_simple_reader)
414	{
415	dVAR; dXSARGS;
416	dMOUSE_self;
417	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
418	SV* value;
419
420	if (items != 1) {
421	croak("Expected exactly one argument for a reader for '%"SVf"'", slot);
422	}
423
424	value = mouse_instance_get_slot(aTHX_ self, slot);
425	ST(0) = value ? value : &PL_sv_undef;
426	XSRETURN(1);
427	}
428
429
430	XS(mouse_xs_simple_writer)
431	{
432	dVAR; dXSARGS;
433	dMOUSE_self;
434	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
435
436	if (items != 2) {
437	croak("Expected exactly two argument for a writer for '%"SVf"'", slot);
438	}
439
440	ST(0) = mouse_instance_set_slot(aTHX_ self, slot, ST(1));
441	XSRETURN(1);
442	}
443
444	XS(mouse_xs_simple_clearer)
445	{
446	dVAR; dXSARGS;
447	dMOUSE_self;
448	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
449	SV* value;
450
451	if (items != 1) {
452	croak("Expected exactly one argument for a clearer for '%"SVf"'", slot);
453	}
454
455	value = mouse_instance_delete_slot(aTHX_ self, slot);
456	ST(0) = value ? value : &PL_sv_undef;
457	XSRETURN(1);
458	}
459
460	XS(mouse_xs_simple_predicate)
461	{
462	dVAR; dXSARGS;
463	dMOUSE_self;
464	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
465
466	if (items != 1) {
467	croak("Expected exactly one argument for a predicate for '%"SVf"'", slot);
468	}
469
470	ST(0) = boolSV( mouse_instance_has_slot(aTHX_ self, slot) );
471	XSRETURN(1);
472	}
473
76770976	474	/* simple instance slot accessor (or Mouse::Meta::Instance) */
646c0371	475
	476	SV*
	477	mouse_instance_create(pTHX_ HV* const stash) {
	478	assert(stash);
	479	return sv_bless( newRV_noinc((SV*)newHV()), stash );
	480	}
	481
	482	SV*
	483	mouse_instance_clone(pTHX_ SV* const instance) {
	484	HV* proto;
	485	assert(instance);
	486
	487	CHECK_INSTANCE(instance);
	488	proto = newHVhv((HV*)SvRV(instance));
	489	return sv_bless( newRV_noinc((SV*)proto), SvSTASH(SvRV(instance)) );
	490	}
	491
	492	bool
	493	mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
	494	assert(instance);
	495	assert(slot);
	496	CHECK_INSTANCE(instance);
	497	return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
	498	}
	499
	500	SV*
	501	mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
	502	HE* he;
	503	assert(instance);
	504	assert(slot);
	505	CHECK_INSTANCE(instance);
	506	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
	507	return he ? HeVAL(he) : NULL;
	508	}
	509
	510	SV*
	511	mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
	512	HE* he;
	513	SV* sv;
	514	assert(instance);
	515	assert(slot);
	516	assert(value);
	517	CHECK_INSTANCE(instance);
	518	he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
	519	sv = HeVAL(he);
	520	sv_setsv_mg(sv, value);
	521	return sv;
	522	}
	523
	524	SV*
	525	mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
	526	assert(instance);
	527	assert(slot);
	528	CHECK_INSTANCE(instance);
	529	return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
	530	}
	531
	532	void
	533	mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
	534	HE* he;
	535	assert(instance);
	536	assert(slot);
	537	CHECK_INSTANCE(instance);
	538	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
539	if(he){
540	sv_rvweaken(HeVAL(he));
541	}
542	}
543	\r
544	MODULE = Mouse::Meta::Method::Accessor::XS PACKAGE = Mouse::Meta::Method::Accessor::XS
545
546	PROTOTYPES: DISABLE
547	VERSIONCHECK: DISABLE
548
549	CV*
550	_generate_accessor(klass, SV* attr, metaclass)
551	CODE:
552	{
553	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_accessor);
554	}
555	OUTPUT:
556	RETVAL
557
558	CV*
559	_generate_reader(klass, SV* attr, metaclass)
560	CODE:
561	{
562	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_reader);
563	}
564	OUTPUT:
565	RETVAL
566
567	CV*
568	_generate_writer(klass, SV* attr, metaclass)
569	CODE:
570	{
571	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_writer);
572	}
573	OUTPUT:
574	RETVAL
575
576	CV*
577	_generate_clearer(klass, SV* attr, metaclass)
578	CODE:
579	{
580	SV* const slot = mcall0s(attr, "name");
581	STRLEN len;
582	const char* const pv = SvPV_const(slot, len);
583	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_clearer);
584	}
585	OUTPUT:
586	RETVAL
587
588	CV*
589	_generate_predicate(klass, SV* attr, metaclass)
590	CODE:
591	{
592	SV* const slot = mcall0s(attr, "name");
593	STRLEN len;
594	const char* const pv = SvPV_const(slot, len);
595	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_predicate);
596	}
597	OUTPUT:
598	RETVAL
599