[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->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 = 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(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 = get_slot(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) = set_slot(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 = delete_slot(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( 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, 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) {
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 ){
	253	AV* const xa = MOUSE_mg_xa(mg);
	254	SV* const attr = MOUSE_xa_attribute(xa);
	255
	256	/* get default value by $attr->default or $attr->builder */
	257	if(flags & MOUSEf_ATTR_HAS_DEFAULT){
	258	value = mcall0s(attr, "default");
	259
	260	if(SvROK(value) && SvTYPE(SvRV(value)) == SVt_PVCV){
	261	value = mcall0(self, value);
	262	}
	263	}
	264	else if(flags & MOUSEf_ATTR_HAS_BUILDER){
	265	SV* const builder = mcall0s(attr, "builder");
	266	value = mcall0(self, builder);
	267	}
	268
	269	if(!value){
	270	value = sv_newmortal();
	271	}
	272
	273	/* apply coerce and type constraint */
	274	if(flags & MOUSEf_ATTR_HAS_TC){
	275	value = mouse_apply_type_constraint(aTHX_ xa, value, flags);
	276	}
	277
	278	/* store value to slot */
6fe2272b	279	value = set_slot(self, slot, value);
646c0371	280	}
646c0371	281
208ffaeb	282	PUSH_VALUE(value, flags);
646c0371	283	}
	284
	285	static void
	286	mouse_attr_set(pTHX_ SV* const self, MAGIC* const mg, SV* value){
	287	U16 const flags = MOUSE_mg_flags(mg);
	288	SV* const slot = MOUSE_mg_slot(mg);
	289
	290	if(flags & MOUSEf_ATTR_HAS_TC){
	291	value = mouse_apply_type_constraint(aTHX_ MOUSE_mg_xa(mg), value, flags);
	292	}
	293
6fe2272b	294	set_slot(self, slot, value);
646c0371	295
646c0371	296	if(flags & MOUSEf_ATTR_IS_WEAK_REF){
6fe2272b	297	weaken_slot(self, slot);
646c0371	298	}
	299
	300	if(flags & MOUSEf_ATTR_HAS_TRIGGER){
	301	SV* const trigger = mcall0s(MOUSE_mg_attribute(mg), "trigger");
	302	dSP;
	303
	304	PUSHMARK(SP);
	305	EXTEND(SP, 2);
	306	PUSHs(self);
	307	PUSHs(value);
	308
	309	PUTBACK;
	310	call_sv(trigger, G_VOID \| G_DISCARD);
	311	/* need not SPAGAIN */
	312	}
	313
208ffaeb	314	PUSH_VALUE(value, flags);
646c0371	315	}
	316
	317	XS(mouse_xs_accessor)
	318	{
	319	dVAR; dXSARGS;
	320	dMOUSE_self;
	321	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	322
	323	SP -= items; /* PPCODE */
	324	PUTBACK;
	325
	326	if(items == 1){ /* reader */
	327	mouse_attr_get(aTHX_ self, mg);
	328	}
	329	else if (items == 2){ /* writer */
	330	mouse_attr_set(aTHX_ self, mg, ST(1));
	331	}
	332	else{
	333	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	334	"Expected exactly one or two argument for an accessor");
	335	}
	336	}
	337
	338
	339	XS(mouse_xs_reader)
	340	{
	341	dVAR; dXSARGS;
	342	dMOUSE_self;
	343	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	344
	345	if (items != 1) {
	346	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	347	"Cannot assign a value to a read-only accessor");
	348	}
	349
	350	SP -= items; /* PPCODE */
	351	PUTBACK;
	352
	353	mouse_attr_get(aTHX_ self, mg);
	354	}
	355
	356	XS(mouse_xs_writer)
	357	{
	358	dVAR; dXSARGS;
	359	dMOUSE_self;
	360	MAGIC* const mg = (MAGIC*)XSANY.any_ptr;
	361
	362	if (items != 2) {
	363	mouse_throw_error(MOUSE_mg_attribute(mg), NULL,
	364	"Too few arguments for a write-only accessor");
	365	}
	366
	367	SP -= items; /* PPCODE */
	368	PUTBACK;
	369
	370	mouse_attr_set(aTHX_ self, mg, ST(1));
	371	}
	372
	373	/* simple accessors */
	374
	375	/*
	376	static MAGIC*
	377	mouse_accessor_get_mg(pTHX_ CV* const xsub){
	378	return moose_mg_find(aTHX_ (SV*)xsub, &mouse_simple_accessor_vtbl, MOOSEf_DIE_ON_FAIL);
379	}
380	*/
381
382	CV*
383	mouse_install_simple_accessor(pTHX_ const char* const fq_name, const char* const key, I32 const keylen, XSUBADDR_t const accessor_impl){
384	CV* const xsub = newXS((char*)fq_name, accessor_impl, __FILE__);
385	SV* const slot = newSVpvn_share(key, keylen, 0U);
386	MAGIC* mg;
387
388	if(!fq_name){
389	/* anonymous xsubs need sv_2mortal */
390	sv_2mortal((SV*)xsub);
391	}
392
393	mg = sv_magicext((SV*)xsub, slot, PERL_MAGIC_ext, &mouse_accessor_vtbl, NULL, 0);
394	SvREFCNT_dec(slot); /* sv_magicext() increases refcnt in mg_obj */
395
396	/* NOTE:
397	* although we use MAGIC for gc, we also store mg to CvXSUBANY for efficiency (gfx)
398	*/
399	CvXSUBANY(xsub).any_ptr = (void*)mg;
400
401	return xsub;
402	}
403
404	XS(mouse_xs_simple_reader)
405	{
406	dVAR; dXSARGS;
407	dMOUSE_self;
408	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
409	SV* value;
410
411	if (items != 1) {
412	croak("Expected exactly one argument for a reader for '%"SVf"'", slot);
413	}
414
6fe2272b	415	value = get_slot(self, slot);
646c0371	416	ST(0) = value ? value : &PL_sv_undef;
	417	XSRETURN(1);
	418	}
	419
	420
	421	XS(mouse_xs_simple_writer)
	422	{
	423	dVAR; dXSARGS;
	424	dMOUSE_self;
	425	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	426
	427	if (items != 2) {
	428	croak("Expected exactly two argument for a writer for '%"SVf"'", slot);
	429	}
	430
6fe2272b	431	ST(0) = set_slot(self, slot, ST(1));
646c0371	432	XSRETURN(1);
	433	}
	434
	435	XS(mouse_xs_simple_clearer)
	436	{
	437	dVAR; dXSARGS;
	438	dMOUSE_self;
	439	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	440	SV* value;
	441
	442	if (items != 1) {
	443	croak("Expected exactly one argument for a clearer for '%"SVf"'", slot);
	444	}
	445
6fe2272b	446	value = delete_slot(self, slot);
646c0371	447	ST(0) = value ? value : &PL_sv_undef;
	448	XSRETURN(1);
	449	}
	450
	451	XS(mouse_xs_simple_predicate)
	452	{
	453	dVAR; dXSARGS;
	454	dMOUSE_self;
	455	SV* const slot = MOUSE_mg_slot((MAGIC*)XSANY.any_ptr);
	456
	457	if (items != 1) {
	458	croak("Expected exactly one argument for a predicate for '%"SVf"'", slot);
	459	}
	460
6fe2272b	461	ST(0) = boolSV( has_slot(self, slot) );
646c0371	462	XSRETURN(1);
	463	}
	464
76770976	465	/* simple instance slot accessor (or Mouse::Meta::Instance) */
646c0371	466
	467	SV*
	468	mouse_instance_create(pTHX_ HV* const stash) {
	469	assert(stash);
	470	return sv_bless( newRV_noinc((SV*)newHV()), stash );
	471	}
	472
	473	SV*
	474	mouse_instance_clone(pTHX_ SV* const instance) {
	475	HV* proto;
	476	assert(instance);
	477
	478	CHECK_INSTANCE(instance);
	479	proto = newHVhv((HV*)SvRV(instance));
	480	return sv_bless( newRV_noinc((SV*)proto), SvSTASH(SvRV(instance)) );
	481	}
	482
	483	bool
	484	mouse_instance_has_slot(pTHX_ SV* const instance, SV* const slot) {
	485	assert(instance);
	486	assert(slot);
	487	CHECK_INSTANCE(instance);
	488	return hv_exists_ent((HV*)SvRV(instance), slot, 0U);
	489	}
	490
	491	SV*
	492	mouse_instance_get_slot(pTHX_ SV* const instance, SV* const slot) {
	493	HE* he;
	494	assert(instance);
	495	assert(slot);
	496	CHECK_INSTANCE(instance);
	497	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
	498	return he ? HeVAL(he) : NULL;
	499	}
	500
	501	SV*
	502	mouse_instance_set_slot(pTHX_ SV* const instance, SV* const slot, SV* const value) {
	503	HE* he;
	504	SV* sv;
	505	assert(instance);
	506	assert(slot);
	507	assert(value);
	508	CHECK_INSTANCE(instance);
	509	he = hv_fetch_ent((HV*)SvRV(instance), slot, TRUE, 0U);
	510	sv = HeVAL(he);
	511	sv_setsv_mg(sv, value);
	512	return sv;
	513	}
	514
	515	SV*
	516	mouse_instance_delete_slot(pTHX_ SV* const instance, SV* const slot) {
	517	assert(instance);
	518	assert(slot);
	519	CHECK_INSTANCE(instance);
	520	return hv_delete_ent((HV*)SvRV(instance), slot, 0, 0U);
	521	}
	522
	523	void
	524	mouse_instance_weaken_slot(pTHX_ SV* const instance, SV* const slot) {
	525	HE* he;
	526	assert(instance);
	527	assert(slot);
	528	CHECK_INSTANCE(instance);
	529	he = hv_fetch_ent((HV*)SvRV(instance), slot, FALSE, 0U);
530	if(he){
531	sv_rvweaken(HeVAL(he));
532	}
533	}
534	\r
535	MODULE = Mouse::Meta::Method::Accessor::XS PACKAGE = Mouse::Meta::Method::Accessor::XS
536
537	PROTOTYPES: DISABLE
538	VERSIONCHECK: DISABLE
539
540	CV*
541	_generate_accessor(klass, SV* attr, metaclass)
542	CODE:
543	{
544	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_accessor);
545	}
546	OUTPUT:
547	RETVAL
548
549	CV*
550	_generate_reader(klass, SV* attr, metaclass)
551	CODE:
552	{
553	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_reader);
554	}
555	OUTPUT:
556	RETVAL
557
558	CV*
559	_generate_writer(klass, SV* attr, metaclass)
560	CODE:
561	{
562	RETVAL = mouse_instantiate_xs_accessor(aTHX_ attr, mouse_xs_writer);
563	}
564	OUTPUT:
565	RETVAL
566
567	CV*
568	_generate_clearer(klass, SV* attr, metaclass)
569	CODE:
570	{
571	SV* const slot = mcall0s(attr, "name");
572	STRLEN len;
573	const char* const pv = SvPV_const(slot, len);
574	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_clearer);
575	}
576	OUTPUT:
577	RETVAL
578
579	CV*
580	_generate_predicate(klass, SV* attr, metaclass)
581	CODE:
582	{
583	SV* const slot = mcall0s(attr, "name");
584	STRLEN len;
585	const char* const pv = SvPV_const(slot, len);
586	RETVAL = mouse_install_simple_accessor(aTHX_ NULL, pv, len, mouse_xs_simple_predicate);
587	}
588	OUTPUT:
589	RETVAL
590