[p5sagit/p5-mst-13.2.git] / universal.c

#include "EXTERN.h"
#define PERL_IN_UNIVERSAL_C
#include "perl.h"

/*
 * Contributed by Graham Barr  <Graham.Barr@tiuk.ti.com>
 * The main guts of traverse_isa was actually copied from gv_fetchmeth
 */

STATIC SV *
S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
{
    AV* av;
    GV* gv;
    GV** gvp;
    HV* hv = Nullhv;

    if (!stash)
	return &PL_sv_undef;

    if(strEQ(HvNAME(stash), name))
	return &PL_sv_yes;

    if (level > 100)
	Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash));

    gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);

    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) {
	SV* sv;
	SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
	if (svp && (sv = *svp) != (SV*)&PL_sv_undef)
	    return sv;
    }

    gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
    
    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
	if(!hv) {
	    gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);

	    gv = *gvp;

	    if (SvTYPE(gv) != SVt_PVGV)
		gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);

	    hv = GvHVn(gv);
	}
	if(hv) {
	    SV** svp = AvARRAY(av);
	    /* NOTE: No support for tied ISA */
	    I32 items = AvFILLp(av) + 1;
	    while (items--) {
		SV* sv = *svp++;
		HV* basestash = gv_stashsv(sv, FALSE);
		if (!basestash) {
		    dTHR;
		    if (ckWARN(WARN_MISC))
			Perl_warner(aTHX_ WARN_SYNTAX,
		             "Can't locate package %s for @%s::ISA",
			    SvPVX(sv), HvNAME(stash));
		    continue;
		}
		if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
		    (void)hv_store(hv,name,len,&PL_sv_yes,0);
		    return &PL_sv_yes;
		}
	    }
	    (void)hv_store(hv,name,len,&PL_sv_no,0);
	}
    }

    return boolSV(strEQ(name, "UNIVERSAL"));
}

/*
=for apidoc sv_derived_from

Returns a boolean indicating whether the SV is derived from the specified
class.  This is the function that implements C<UNIVERSAL::isa>.  It works
for class names as well as for objects.

=cut
*/

bool
Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
{
    SV *rv;
    char *type;
    HV *stash;
  
    stash = Nullhv;
    type = Nullch;
 
    if (SvGMAGICAL(sv))
        mg_get(sv) ;

    if (SvROK(sv)) {
        sv = SvRV(sv);
        type = sv_reftype(sv,0);
        if(SvOBJECT(sv))
            stash = SvSTASH(sv);
    }
    else {
        stash = gv_stashsv(sv, FALSE);
    }
 
    return (type && strEQ(type,name)) ||
            (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes)
        ? TRUE
        : FALSE ;
 
}

void XS_UNIVERSAL_isa(pTHXo_ CV *cv);
void XS_UNIVERSAL_can(pTHXo_ CV *cv);
void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv);

void
Perl_boot_core_UNIVERSAL(pTHX)
{
    char *file = __FILE__;

    newXS("UNIVERSAL::isa",             XS_UNIVERSAL_isa,         file);
    newXS("UNIVERSAL::can",             XS_UNIVERSAL_can,         file);
    newXS("UNIVERSAL::VERSION", 	XS_UNIVERSAL_VERSION, 	  file);
}

#include "XSUB.h"

XS(XS_UNIVERSAL_isa)
{
    dXSARGS;
    SV *sv;
    char *name;
    STRLEN n_a;

    if (items != 2)
	Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");

    sv = ST(0);

    if (!SvOK(sv) || !(SvROK(sv) || SvCUR(sv)))
	XSRETURN_UNDEF;

    name = (char *)SvPV(ST(1),n_a);

    ST(0) = boolSV(sv_derived_from(sv, name));
    XSRETURN(1);
}

XS(XS_UNIVERSAL_can)
{
    dXSARGS;
    SV   *sv;
    char *name;
    SV   *rv;
    HV   *pkg = NULL;
    STRLEN n_a;

    if (items != 2)
	Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");

    sv = ST(0);

    if (!SvOK(sv) || !(SvROK(sv) || SvCUR(sv)))
	XSRETURN_UNDEF;

    name = (char *)SvPV(ST(1),n_a);
    rv = &PL_sv_undef;

    if(SvROK(sv)) {
        sv = (SV*)SvRV(sv);
        if(SvOBJECT(sv))
            pkg = SvSTASH(sv);
    }
    else {
        pkg = gv_stashsv(sv, FALSE);
    }

    if (pkg) {
        GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
        if (gv && isGV(gv))
	    rv = sv_2mortal(newRV((SV*)GvCV(gv)));
    }

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

XS(XS_UNIVERSAL_VERSION)
{
    dXSARGS;
    HV *pkg;
    GV **gvp;
    GV *gv;
    SV *sv;
    char *undef;

    if (SvROK(ST(0))) {
        sv = (SV*)SvRV(ST(0));
        if (!SvOBJECT(sv))
            Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
        pkg = SvSTASH(sv);
    }
    else {
        pkg = gv_stashsv(ST(0), FALSE);
    }

    gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);

    if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
        SV *nsv = sv_newmortal();
        sv_setsv(nsv, sv);
        sv = nsv;
        undef = Nullch;
    }
    else {
        sv = (SV*)&PL_sv_undef;
        undef = "(undef)";
    }

    if (items > 1) {
	STRLEN len;
	SV *req = ST(1);

	if (undef)
	    Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
		       HvNAME(pkg), HvNAME(pkg));

	if (!SvNIOK(sv) && SvPOK(sv)) {
	    char *str = SvPVx(sv,len);
	    while (len) {
		--len;
		/* XXX could DWIM "1.2.3" here */
		if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
		    break;
	    }
	    if (len) {
		if (SvNIOKp(req) && SvPOK(req)) {
		    /* they said C<use Foo v1.2.3> and $Foo::VERSION
		     * doesn't look like a float: do string compare */
		    if (sv_cmp(req,sv) == 1) {
			Perl_croak(aTHX_ "%s version v%vd required--"
				   "this is only version v%vd",
				   HvNAME(pkg), req, sv);
		    }
		    goto finish;
		}
		/* they said C<use Foo 1.002_003> and $Foo::VERSION
		 * doesn't look like a float: force numeric compare */
		SvUPGRADE(sv, SVt_PVNV);
		SvNVX(sv) = str_to_version(sv);
		SvPOK_off(sv);
		SvNOK_on(sv);
	    }
	}
	/* if we get here, we're looking for a numeric comparison,
	 * so force the required version into a float, even if they
	 * said C<use Foo v1.2.3> */
	if (SvNIOKp(req) && SvPOK(req)) {
	    NV n = SvNV(req);
	    req = sv_newmortal();
	    sv_setnv(req, n);
	}

	if (SvNV(req) > SvNV(sv))
	    Perl_croak(aTHX_ "%s version %s required--this is only version %s",
		  HvNAME(pkg), SvPV(req,len), SvPV(sv,len));
    }

finish:
    ST(0) = sv;

    XSRETURN(1);
}
Commit	Line	Data
6d4a7be2	1	#include "EXTERN.h"
864dbfa3	2	#define PERL_IN_UNIVERSAL_C
6d4a7be2	3	#include "perl.h"
6d4a7be2	4
	5	/*
	6	* Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
	7	* The main guts of traverse_isa was actually copied from gv_fetchmeth
	8	*/
	9
76e3520e	10	STATIC SV *
cea2e8a9	11	S_isa_lookup(pTHX_ HV stash, const char name, int len, int level)
6d4a7be2	12	{
	13	AV* av;
	14	GV* gv;
	15	GV** gvp;
	16	HV* hv = Nullhv;
	17
	18	if (!stash)
3280af22	19	return &PL_sv_undef;
6d4a7be2	20
6d4a7be2	21	if(strEQ(HvNAME(stash), name))
3280af22	22	return &PL_sv_yes;
6d4a7be2	23
6d4a7be2	24	if (level > 100)
cea2e8a9	25	Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash));
6d4a7be2	26
	27	gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
	28
3280af22	29	if (gvp && (gv = gvp) != (GV)&PL_sv_undef && (hv = GvHV(gv))) {
6d4a7be2	30	SV* sv;
6d4a7be2	31	SV svp = (SV)hv_fetch(hv, name, len, FALSE);
3280af22	32	if (svp && (sv = svp) != (SV)&PL_sv_undef)
6d4a7be2	33	return sv;
	34	}
	35
	36	gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
	37
3280af22	38	if (gvp && (gv = gvp) != (GV)&PL_sv_undef && (av = GvAV(gv))) {
6d4a7be2	39	if(!hv) {
	40	gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
	41
	42	gv = *gvp;
	43
	44	if (SvTYPE(gv) != SVt_PVGV)
	45	gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
	46
	47	hv = GvHVn(gv);
	48	}
	49	if(hv) {
	50	SV** svp = AvARRAY(av);
93965878	51	/* NOTE: No support for tied ISA */
93965878	52	I32 items = AvFILLp(av) + 1;
6d4a7be2	53	while (items--) {
	54	SV* sv = *svp++;
	55	HV* basestash = gv_stashsv(sv, FALSE);
	56	if (!basestash) {
d008e5eb	57	dTHR;
599cee73	58	if (ckWARN(WARN_MISC))
cea2e8a9	59	Perl_warner(aTHX_ WARN_SYNTAX,
599cee73	60	"Can't locate package %s for @%s::ISA",
6d4a7be2	61	SvPVX(sv), HvNAME(stash));
	62	continue;
	63	}
3280af22	64	if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
	65	(void)hv_store(hv,name,len,&PL_sv_yes,0);
	66	return &PL_sv_yes;
6d4a7be2	67	}
6d4a7be2	68	}
3280af22	69	(void)hv_store(hv,name,len,&PL_sv_no,0);
6d4a7be2	70	}
	71	}
	72
e09f3e01	73	return boolSV(strEQ(name, "UNIVERSAL"));
6d4a7be2	74	}
6d4a7be2	75
954c1994	76	/*
	77	=for apidoc sv_derived_from
	78
	79	Returns a boolean indicating whether the SV is derived from the specified
	80	class. This is the function that implements C<UNIVERSAL::isa>. It works
	81	for class names as well as for objects.
	82
	83	=cut
	84	*/
	85
55497cff	86	bool
864dbfa3	87	Perl_sv_derived_from(pTHX_ SV sv, const char name)
55497cff	88	{
	89	SV *rv;
	90	char *type;
	91	HV *stash;
	92
	93	stash = Nullhv;
	94	type = Nullch;
	95
	96	if (SvGMAGICAL(sv))
	97	mg_get(sv) ;
	98
	99	if (SvROK(sv)) {
	100	sv = SvRV(sv);
	101	type = sv_reftype(sv,0);
	102	if(SvOBJECT(sv))
	103	stash = SvSTASH(sv);
	104	}
	105	else {
	106	stash = gv_stashsv(sv, FALSE);
	107	}
	108
	109	return (type && strEQ(type,name)) \|\|
3280af22	110	(stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes)
55497cff	111	? TRUE
	112	: FALSE ;
	113
	114	}
	115
0cb96387	116	void XS_UNIVERSAL_isa(pTHXo_ CV *cv);
	117	void XS_UNIVERSAL_can(pTHXo_ CV *cv);
	118	void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv);
	119
	120	void
	121	Perl_boot_core_UNIVERSAL(pTHX)
	122	{
	123	char *file = __FILE__;
	124
	125	newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
	126	newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
	127	newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
	128	}
	129
76e3520e	130	#include "XSUB.h"
55497cff	131
6d4a7be2	132	XS(XS_UNIVERSAL_isa)
	133	{
	134	dXSARGS;
55497cff	135	SV *sv;
55497cff	136	char *name;
2d8e6c8d	137	STRLEN n_a;
6d4a7be2	138
6d4a7be2	139	if (items != 2)
cea2e8a9	140	Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
6d4a7be2	141
6d4a7be2	142	sv = ST(0);
f8f70380	143
	144	if (!SvOK(sv) \|\| !(SvROK(sv) \|\| SvCUR(sv)))
	145	XSRETURN_UNDEF;
	146
2d8e6c8d	147	name = (char *)SvPV(ST(1),n_a);
6d4a7be2	148
54310121	149	ST(0) = boolSV(sv_derived_from(sv, name));
6d4a7be2	150	XSRETURN(1);
	151	}
	152
6d4a7be2	153	XS(XS_UNIVERSAL_can)
	154	{
	155	dXSARGS;
	156	SV *sv;
	157	char *name;
	158	SV *rv;
6f08146e	159	HV *pkg = NULL;
2d8e6c8d	160	STRLEN n_a;
6d4a7be2	161
6d4a7be2	162	if (items != 2)
cea2e8a9	163	Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
6d4a7be2	164
6d4a7be2	165	sv = ST(0);
f8f70380	166
	167	if (!SvOK(sv) \|\| !(SvROK(sv) \|\| SvCUR(sv)))
	168	XSRETURN_UNDEF;
	169
2d8e6c8d	170	name = (char *)SvPV(ST(1),n_a);
3280af22	171	rv = &PL_sv_undef;
6d4a7be2	172
6f08146e	173	if(SvROK(sv)) {
	174	sv = (SV*)SvRV(sv);
	175	if(SvOBJECT(sv))
	176	pkg = SvSTASH(sv);
	177	}
	178	else {
	179	pkg = gv_stashsv(sv, FALSE);
	180	}
	181
	182	if (pkg) {
dc848c6f	183	GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
	184	if (gv && isGV(gv))
	185	rv = sv_2mortal(newRV((SV*)GvCV(gv)));
6d4a7be2	186	}
	187
	188	ST(0) = rv;
	189	XSRETURN(1);
	190	}
	191
6d4a7be2	192	XS(XS_UNIVERSAL_VERSION)
	193	{
	194	dXSARGS;
	195	HV *pkg;
	196	GV **gvp;
	197	GV *gv;
	198	SV *sv;
	199	char *undef;
	200
1571675a	201	if (SvROK(ST(0))) {
6d4a7be2	202	sv = (SV*)SvRV(ST(0));
1571675a	203	if (!SvOBJECT(sv))
cea2e8a9	204	Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
6d4a7be2	205	pkg = SvSTASH(sv);
	206	}
	207	else {
	208	pkg = gv_stashsv(ST(0), FALSE);
	209	}
	210
	211	gvp = pkg ? (GV)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV);
	212
d4bea2fb	213	if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
6d4a7be2	214	SV *nsv = sv_newmortal();
	215	sv_setsv(nsv, sv);
	216	sv = nsv;
	217	undef = Nullch;
	218	}
	219	else {
3280af22	220	sv = (SV*)&PL_sv_undef;
6d4a7be2	221	undef = "(undef)";
	222	}
	223
1571675a	224	if (items > 1) {
	225	STRLEN len;
	226	SV *req = ST(1);
	227
	228	if (undef)
	229	Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
	230	HvNAME(pkg), HvNAME(pkg));
	231
	232	if (!SvNIOK(sv) && SvPOK(sv)) {
	233	char *str = SvPVx(sv,len);
	234	while (len) {
	235	--len;
	236	/* XXX could DWIM "1.2.3" here */
	237	if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
	238	break;
	239	}
	240	if (len) {
	241	if (SvNIOKp(req) && SvPOK(req)) {
	242	/* they said C<use Foo v1.2.3> and $Foo::VERSION
	243	* doesn't look like a float: do string compare */
	244	if (sv_cmp(req,sv) == 1) {
	245	Perl_croak(aTHX_ "%s version v%vd required--"
	246	"this is only version v%vd",
	247	HvNAME(pkg), req, sv);
	248	}
	249	goto finish;
	250	}
	251	/* they said C<use Foo 1.002_003> and $Foo::VERSION
	252	* doesn't look like a float: force numeric compare */
	253	SvUPGRADE(sv, SVt_PVNV);
	254	SvNVX(sv) = str_to_version(sv);
	255	SvPOK_off(sv);
	256	SvNOK_on(sv);
	257	}
	258	}
	259	/* if we get here, we're looking for a numeric comparison,
	260	* so force the required version into a float, even if they
	261	* said C<use Foo v1.2.3> */
	262	if (SvNIOKp(req) && SvPOK(req)) {
	263	NV n = SvNV(req);
	264	req = sv_newmortal();
	265	sv_setnv(req, n);
	266	}
	267
	268	if (SvNV(req) > SvNV(sv))
	269	Perl_croak(aTHX_ "%s version %s required--this is only version %s",
	270	HvNAME(pkg), SvPV(req,len), SvPV(sv,len));
2d8e6c8d	271	}
6d4a7be2	272
1571675a	273	finish:
6d4a7be2	274	ST(0) = sv;
	275
	276	XSRETURN(1);
	277	}
	278