[gitmo/Class-C3.git] / lib / Class / C3.xs


#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
 
STATIC I32
__dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) {
    I32 i;
    for (i = startingblock; i >= 0; i--) {
	register const PERL_CONTEXT * const cx = &cxstk[i];
	switch (CxTYPE(cx)) {
	default:
	    continue;
	case CXt_EVAL:
	case CXt_SUB:
	case CXt_FORMAT:
	    DEBUG_l( Perl_deb(aTHX_ "(Found sub #%ld)\n", (long)i));
	    return i;
	}
    }
    return i;
}

MODULE = Class::C3	PACKAGE = next

CV*
canxs(self)
    SV* self;
  CODE:
    register I32 cxix = __dopoptosub_at(cxstack, cxstack_ix);
    register const PERL_CONTEXT *cx;
    register const PERL_CONTEXT *ccstack = cxstack;
    const PERL_SI *top_si = PL_curstackinfo;
    HV* selfstash;
    //sv_dump(self);
    if(sv_isobject(self)) {
        selfstash = SvSTASH(SvRV(self));
    }
    else {
        selfstash = gv_stashsv(self, 0);
    }
    assert(selfstash);

    for (;;) {
        /* we may be in a higher stacklevel, so dig down deeper */
        while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
            top_si = top_si->si_prev;
            ccstack = top_si->si_cxstack;
            cxix = __dopoptosub_at(ccstack, top_si->si_cxix);
        }
        if (cxix < 0) {
            croak("next::/maybe::next:: must be used in method context");
        }
    
        /* caller() should not report the automatic calls to &DB::sub */
        if (PL_DBsub && GvCV(PL_DBsub) && cxix >= 0 && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
            continue;

        cx = &ccstack[cxix];
        if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
            const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1);
            /* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
               field below is defined for any cx. */
            /* caller() should not report the automatic calls to &DB::sub */
            if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
                cx = &ccstack[dbcxix];
            }
            if (CxTYPE(cx) == CXt_SUB || CxTYPE(cx) == CXt_FORMAT) {
	        GV * const cvgv = CvGV(ccstack[cxix].blk_sub.cv);
	        /* So is ccstack[dbcxix]. */
	        if (isGV(cvgv)) { /* we found a real sub here */
                    const char *stashname;
                    const char *fq_subname;
                    const char *subname;
                    STRLEN fq_subname_len;
                    STRLEN stashname_len;
                    STRLEN subname_len;
                    GV * found_gv;
	            SV * const sv = sv_2mortal(newSV(0));

	            gv_efullname3(sv, cvgv, NULL);

                    fq_subname = SvPVX(sv);
                    fq_subname_len = SvCUR(sv);
/*                    warn("fqsubname is %s", fq_subname); */
                    
                    subname = strrchr(fq_subname, ':');
                    if(subname) {
                        subname++;
                        subname_len = fq_subname_len - (subname - fq_subname);
                        stashname = fq_subname;
                        stashname_len = subname - fq_subname - 2;
                        if(subname_len == 8 && strEQ(subname, "__ANON__")) {
                            croak("Cannot use next::method/next::can/maybe::next::method from an anonymous sub");
                        }
                        else {
                            GV** gvp;
                            AV* linear_av;
                            SV** linear_svp;
                            SV* linear_sv;
                            HV* curstash;
                            GV* candidate = NULL;
                            CV* cand_cv = NULL;
                            const char *hvname;
                            I32 items;

                            hvname = HvNAME_get(selfstash);
                            if (!hvname)
                              Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");

                            linear_av = mro_linear(selfstash); /* has ourselves at the top of the list */
                            sv_2mortal((SV*)linear_av);

                            linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
                            items = AvFILLp(linear_av); /* no +1, to skip over self */

                            while (items--) {
                                linear_sv = *linear_svp++;
                                assert(linear_sv);
                                if(strEQ(SvPVX(linear_sv), stashname)) break;
                            }

                            while (items--) {
                                linear_sv = *linear_svp++;
                                assert(linear_sv);
                                curstash = gv_stashsv(linear_sv, FALSE);

                                if (!curstash) {
                                    if (ckWARN(WARN_MISC))
                                        Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
                                            (void*)linear_sv, hvname);
                                    continue;
                                }

                                assert(curstash);

                                gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0);
                                if (!gvp) continue;
                                candidate = *gvp;
                                assert(candidate);
                                if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, curstash, subname, subname_len, TRUE);
                                if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
                                    PUSHs((SV*)cand_cv);
                                    return;
                                }
                            }
    
                            /* Check UNIVERSAL without caching */
                            if((candidate = gv_fetchmeth(NULL, subname, subname_len, 1))) {
                                PUSHs((SV*)GvCV(candidate));
                                return;
                            }
                            PUSHs(&PL_sv_undef);
                            return;
                        }
                    }
	        }
            }

	    cxix = __dopoptosub_at(ccstack, cxix - 1);
        }
Commit	Line	Data
7a3af373	1
	2	#include "EXTERN.h"
	3	#include "perl.h"
	4	#include "XSUB.h"
	5
	6	STATIC I32
	7	__dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) {
	8	I32 i;
	9	for (i = startingblock; i >= 0; i--) {
	10	register const PERL_CONTEXT * const cx = &cxstk[i];
	11	switch (CxTYPE(cx)) {
	12	default:
	13	continue;
	14	case CXt_EVAL:
	15	case CXt_SUB:
	16	case CXt_FORMAT:
	17	DEBUG_l( Perl_deb(aTHX_ "(Found sub #%ld)\n", (long)i));
	18	return i;
	19	}
	20	}
	21	return i;
	22	}
	23
	24	MODULE = Class::C3 PACKAGE = next
	25
	26	CV*
	27	canxs(self)
	28	SV* self;
	29	CODE:
	30	register I32 cxix = __dopoptosub_at(cxstack, cxstack_ix);
	31	register const PERL_CONTEXT *cx;
	32	register const PERL_CONTEXT *ccstack = cxstack;
	33	const PERL_SI *top_si = PL_curstackinfo;
	34	HV* selfstash;
	35	//sv_dump(self);
	36	if(sv_isobject(self)) {
	37	selfstash = SvSTASH(SvRV(self));
	38	}
	39	else {
	40	selfstash = gv_stashsv(self, 0);
	41	}
	42	assert(selfstash);
	43
	44	for (;;) {
	45	/* we may be in a higher stacklevel, so dig down deeper */
	46	while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
	47	top_si = top_si->si_prev;
	48	ccstack = top_si->si_cxstack;
	49	cxix = __dopoptosub_at(ccstack, top_si->si_cxix);
	50	}
	51	if (cxix < 0) {
	52	croak("next::/maybe::next:: must be used in method context");
	53	}
	54
	55	/* caller() should not report the automatic calls to &DB::sub */
	56	if (PL_DBsub && GvCV(PL_DBsub) && cxix >= 0 && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
	57	continue;
	58
	59	cx = &ccstack[cxix];
	60	if (CxTYPE(cx) == CXt_SUB \|\| CxTYPE(cx) == CXt_FORMAT) {
	61	const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1);
	62	/* We expect that ccstack[dbcxix] is CXt_SUB, anyway, the
	63	field below is defined for any cx. */
	64	/* caller() should not report the automatic calls to &DB::sub */
65	if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub))
66	cx = &ccstack[dbcxix];
67	}
68	if (CxTYPE(cx) == CXt_SUB \|\| CxTYPE(cx) == CXt_FORMAT) {
69	GV * const cvgv = CvGV(ccstack[cxix].blk_sub.cv);
70	/* So is ccstack[dbcxix]. */
71	if (isGV(cvgv)) { /* we found a real sub here */
72	const char *stashname;
73	const char *fq_subname;
74	const char *subname;
75	STRLEN fq_subname_len;
76	STRLEN stashname_len;
77	STRLEN subname_len;
78	GV * found_gv;
79	SV * const sv = sv_2mortal(newSV(0));
80
81	gv_efullname3(sv, cvgv, NULL);
82
83	fq_subname = SvPVX(sv);
84	fq_subname_len = SvCUR(sv);
85	/* warn("fqsubname is %s", fq_subname); */
86
87	subname = strrchr(fq_subname, ':');
88	if(subname) {
89	subname++;
90	subname_len = fq_subname_len - (subname - fq_subname);
91	stashname = fq_subname;
92	stashname_len = subname - fq_subname - 2;
93	if(subname_len == 8 && strEQ(subname, "__ANON__")) {
94	croak("Cannot use next::method/next::can/maybe::next::method from an anonymous sub");
95	}
96	else {
97	GV** gvp;
98	AV* linear_av;
99	SV** linear_svp;
100	SV* linear_sv;
101	HV* curstash;
102	GV* candidate = NULL;
103	CV* cand_cv = NULL;
104	const char *hvname;
105	I32 items;
106
107	hvname = HvNAME_get(selfstash);
108	if (!hvname)
109	Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
110
111	linear_av = mro_linear(selfstash); /* has ourselves at the top of the list */
112	sv_2mortal((SV*)linear_av);
113
114	linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
115	items = AvFILLp(linear_av); /* no +1, to skip over self */
116
117	while (items--) {
118	linear_sv = *linear_svp++;
119	assert(linear_sv);
120	if(strEQ(SvPVX(linear_sv), stashname)) break;
121	}
122
123	while (items--) {
124	linear_sv = *linear_svp++;
125	assert(linear_sv);
126	curstash = gv_stashsv(linear_sv, FALSE);
127
128	if (!curstash) {
129	if (ckWARN(WARN_MISC))
130	Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
131	(void*)linear_sv, hvname);
132	continue;
133	}
134
135	assert(curstash);
136
137	gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0);
138	if (!gvp) continue;
139	candidate = *gvp;
140	assert(candidate);
141	if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, curstash, subname, subname_len, TRUE);
142	if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
143	PUSHs((SV*)cand_cv);
144	return;
145	}
146	}
147
148	/* Check UNIVERSAL without caching */
149	if((candidate = gv_fetchmeth(NULL, subname, subname_len, 1))) {
150	PUSHs((SV*)GvCV(candidate));
151	return;
152	}
153	PUSHs(&PL_sv_undef);
154	return;
155	}
156	}
157	}
158	}
159
160	cxix = __dopoptosub_at(ccstack, cxix - 1);
161	}
162
163