[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(!(SvROK(tc_code) && SvTYPE(SvRV(tc_code)) == SVt_PVCV)){
            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* 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 = 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(SvROK(value) && SvTYPE(SvRV(value)) == SVt_PVCV){
                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
d33d8840	168	if(!(SvROK(tc_code) && SvTYPE(SvRV(tc_code)) == SVt_PVCV)){
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){
	209	AV* const av = (AV*)SvRV(value);
	210	I32 len;
	211	I32 i;
646c0371	212
208ffaeb	213	if(SvTYPE(av) != SVt_PVAV){
208ffaeb	214	croak("Mouse-panic: Not an ARRAY reference");
646c0371	215	}
646c0371	216
208ffaeb	217	len = av_len(av) + 1;
	218	EXTEND(SP, len);
	219	for(i = 0; i < len; i++){
	220	SV** const svp = av_fetch(av, i, FALSE);
	221	PUSHs(svp ? *svp : &PL_sv_undef);
646c0371	222	}
646c0371	223	}
208ffaeb	224	else if(flags & MOUSEf_TC_IS_HASHREF){
	225	HV* const hv = (HV*)SvRV(value);
	226	HE* he;
	227
	228	if(SvTYPE(hv) != SVt_PVHV){
	229	croak("Mouse-panic: Not a HASH reference");
	230	}
	231
	232	hv_iterinit(hv);
	233	while((he = hv_iternext(hv))){
	234	EXTEND(SP, 2);
	235	PUSHs(hv_iterkeysv(he));
	236	PUSHs(hv_iterval(hv, he));
	237	}
646c0371	238	}
	239
	240	PUTBACK;
	241	}
	242
	243	static void
	244	mouse_attr_get(pTHX_ SV* const self, MAGIC* const mg){
	245	U16 const flags = MOUSE_mg_flags(mg);
	246	SV* const slot = MOUSE_mg_slot(mg);
	247	SV* value;
	248
6fe2272b	249	value = get_slot(self, slot);
646c0371	250
	251	/* check_lazy */
	252	if( !value && flags & MOUSEf_ATTR_IS_LAZY ){
8fa5f9b8	253	AV* const xa = MOUSE_mg_xa(mg);
646c0371	254	SV* const attr = MOUSE_xa_attribute(xa);
646c0371	255
8fa5f9b8	256	/* get default value by $attr->builder or $attr->default */
	257	if(flags & MOUSEf_ATTR_HAS_BUILDER){
	258	SV* const builder = mcall0s(attr, "builder");
	259	value = mcall0(self, builder);
	260	}
	261	else {
646c0371	262	value = mcall0s(attr, "default");
	263
	264	if(SvROK(value) && SvTYPE(SvRV(value)) == SVt_PVCV){
	265	value = mcall0(self, value);
	266	}
	267	}
646c0371	268
	269	/* apply coerce and type constraint */
	270	if(flags & MOUSEf_ATTR_HAS_TC){
	271	value = mouse_apply_type_constraint(aTHX_ xa, value, flags);
	272	}
	273
	274	/* store value to slot */
6fe2272b	275	value = set_slot(self, slot, value);
646c0371	276	}
646c0371	277
208ffaeb	278	PUSH_VALUE(value, flags);
646c0371	279	}
	280
	281	static void
	282	mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
	283	U16 const flags = MOUSE_mg_flags(mg);
	284	SV* const slot = MOUSE_mg_slot(mg);
	285
	286	if(flags & MOUSEf_ATTR_HAS_TC){
	287	value = mouse_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
	288	}
	289
6fe2272b	290	set_slot(self, slot, value);
646c0371	291
646c0371	292	if(flags & MOUSEf_ATTR_IS_WEAK_REF){
6fe2272b	293	weaken_slot(self, slot);
646c0371	294	}
	295
	296	if(flags & MOUSEf_ATTR_HAS_TRIGGER){
	297	SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
	298	dSP;
	299
	300	PUSHMARK(SP);
	301	EXTEND(SP, 2);
	302	PUSHs(self);
	303	PUSHs(value);
	304
	305	PUTBACK;
	306	call_sv(trigger, G_VOID \| G_DISCARD);
	307	/* need not SPAGAIN */
	308	}
	309
208ffaeb	310	PUSH_VALUE(value, flags);
646c0371	311	}
646c0371	312
30e11004	313	XS(XS_Mouse_accessor)
646c0371	314	{
	315	dVAR; dXSARGS;
	316	dMOUSE_self;
	317	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	318
	319	SP -= items; /* PPCODE */
	320	PUTBACK;
	321
	322	if(items == 1){ /* reader */
	323	mouse_attr_get(aTHX_ self, mg);
	324	}
	325	else if (items == 2){ /* writer */
	326	mouse_attr_set(aTHX_ self, mg, ST(1));
	327	}
	328	else{
	329	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	330	"Expected exactly one or two argument for an accessor");
	331	}
	332	}
	333
	334
30e11004	335	XS(XS_Mouse_reader)
646c0371	336	{
	337	dVAR; dXSARGS;
	338	dMOUSE_self;
	339	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	340
	341	if (items != 1) {
	342	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	343	"Cannot assign a value to a read-only accessor");
	344	}
	345
	346	SP -= items; /* PPCODE */
	347	PUTBACK;
	348
	349	mouse_attr_get(aTHX_ self, mg);
	350	}
	351
30e11004	352	XS(XS_Mouse_writer)
646c0371	353	{
	354	dVAR; dXSARGS;
	355	dMOUSE_self;
	356	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	357
	358	if (items != 2) {
	359	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	360	"Too few arguments for a write-only accessor");
	361	}
	362
	363	SP -= items; /* PPCODE */
	364	PUTBACK;
	365
	366	mouse_attr_set(aTHX_ self, mg, ST(1));
	367	}
	368
	369	/* simple accessors */
	370
	371	/*
	372	static MAGIC*
	373	mouse_accessor_get_mg(pTHX_ CV* const xsub){
	374	return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
	375	}
	376	*/
	377
	378	CV*
	379	mouse_install_simple_accessor(pTHX_ const char* const fq_name, const char* const key, I32 const keylen, XSUBADDR_t const accessor_impl){
	380	CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
	381	SV* const slot = newSVpvn_share(key, keylen, 0U);
	382	MAGIC* mg;
	383
	384	if(!fq_name){
	385	/* anonymous xsubs need sv_2mortal */
	386	sv_2mortal((SV*)xsub);
	387	}
	388
	389	mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, NULL, 0);
	390	SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */
	391
	392	/* NOTE:
	393	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
	394	*/
	395	CvXSUBANY(xsub).any_ptr = (void*)mg;
	396
	397	return xsub;
	398	}
	399
30e11004	400	XS(XS_Mouse_simple_reader)
646c0371	401	{
	402	dVAR; dXSARGS;
	403	dMOUSE_self;
	404	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	405	SV* value;
	406
	407	if (items != 1) {
	408	croak("Expected exactly one argument for a reader for '%"SVf"'", slot);
	409	}
	410
6fe2272b	411	value = get_slot(self, slot);
646c0371	412	ST(0) = value ? value : &PL_sv_undef;
	413	XSRETURN(1);
	414	}
	415
	416
30e11004	417	XS(XS_Mouse_simple_writer)
646c0371	418	{
	419	dVAR; dXSARGS;
	420	dMOUSE_self;
	421	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	422
	423	if (items != 2) {
	424	croak("Expected exactly two argument for a writer for '%"SVf"'", slot);
	425	}
	426
6fe2272b	427	ST(0) = set_slot(self, slot, ST(1));
646c0371	428	XSRETURN(1);
	429	}
	430
30e11004	431	XS(XS_Mouse_simple_clearer)
646c0371	432	{
	433	dVAR; dXSARGS;
	434	dMOUSE_self;
	435	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	436	SV* value;
	437
	438	if (items != 1) {
	439	croak("Expected exactly one argument for a clearer for '%"SVf"'", slot);
	440	}
	441
6fe2272b	442	value = delete_slot(self, slot);
646c0371	443	ST(0) = value ? value : &PL_sv_undef;
	444	XSRETURN(1);
	445	}
	446
30e11004	447	XS(XS_Mouse_simple_predicate)
646c0371	448	{
	449	dVAR; dXSARGS;
	450	dMOUSE_self;
	451	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	452
	453	if (items != 1) {
	454	croak("Expected exactly one argument for a predicate for '%"SVf"'", slot);
	455	}
	456
6fe2272b	457	ST(0) = boolSV( has_slot(self, slot) );
646c0371	458	XSRETURN(1);
	459	}
	460
76770976	461	/* simple instance slot accessor (or Mouse::Meta::Instance) */
646c0371	462
	463	SV*
	464	mouse_instance_create(pTHX_ HV* const stash) {
	465	assert(stash);
	466	return sv_bless( newRV_noinc((SV*)newHV()), stash );
	467	}
	468
	469	SV*
	470	mouse_instance_clone(pTHX_ SV* const instance) {
	471	HV* proto;
	472	assert(instance);
	473
	474	CHECK_INSTANCE(instance);
	475	proto = newHVhv((HV*)SvRV(instance));
	476	return sv_bless( newRV_noinc((SV*)proto), SvSTASH(SvRV(instance)) );
	477	}
	478
	479	bool
	480	mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
	481	assert(instance);
	482	assert(slot);
	483	CHECK_INSTANCE(instance);
	484	return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
	485	}
	486
	487	SV*
	488	mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
	489	HE* he;
	490	assert(instance);
	491	assert(slot);
	492	CHECK_INSTANCE(instance);
	493	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
	494	return he ? HeVAL(he) : NULL;
	495	}
	496
	497	SV*
	498	mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
	499	HE* he;
	500	SV* sv;
	501	assert(instance);
	502	assert(slot);
	503	assert(value);
	504	CHECK_INSTANCE(instance);
	505	he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
	506	sv = HeVAL(he);
	507	sv_setsv_mg(sv, value);
	508	return sv;
	509	}
	510
	511	SV*
	512	mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
	513	assert(instance);
	514	assert(slot);
	515	CHECK_INSTANCE(instance);
	516	return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
	517	}
	518
	519	void
	520	mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
	521	HE* he;
	522	assert(instance);
	523	assert(slot);
	524	CHECK_INSTANCE(instance);
	525	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
526	if(he){
527	sv_rvweaken(HeVAL(he));
528	}
529	}
530	\r
531	MODULE = Mouse::Meta::Method::Accessor::XS PACKAGE = Mouse::Meta::Method::Accessor::XS
532
533	PROTOTYPES: DISABLE
534	VERSIONCHECK: DISABLE
535
536	CV*
537	_generate_accessor(klass, SV* attr, metaclass)
538	CODE:
539	{
30e11004	540	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, XS_Mouse_accessor);
646c0371	541	}
	542	OUTPUT:
	543	RETVAL
	544
	545	CV*
	546	_generate_reader(klass, SV* attr, metaclass)
	547	CODE:
	548	{
30e11004	549	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, XS_Mouse_reader);
646c0371	550	}
	551	OUTPUT:
	552	RETVAL
	553
	554	CV*
	555	_generate_writer(klass, SV* attr, metaclass)
	556	CODE:
	557	{
30e11004	558	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, XS_Mouse_writer);
646c0371	559	}
	560	OUTPUT:
	561	RETVAL
	562
	563	CV*
	564	_generate_clearer(klass, SV* attr, metaclass)
	565	CODE:
	566	{
	567	SV* const slot = mcall0s(attr, "name");
	568	STRLEN len;
	569	const char* const pv = SvPV_const(slot, len);
30e11004	570	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, XS_Mouse_simple_clearer);
646c0371	571	}
	572	OUTPUT:
	573	RETVAL
	574
	575	CV*
	576	_generate_predicate(klass, SV* attr, metaclass)
	577	CODE:
	578	{
	579	SV* const slot = mcall0s(attr, "name");
	580	STRLEN len;
	581	const char* const pv = SvPV_const(slot, len);
30e11004	582	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, XS_Mouse_simple_predicate);
646c0371	583	}
	584	OUTPUT:
	585	RETVAL
	586