Commit | Line | Data |
---|---|---|
6d4a7be2 | 1 | #include "EXTERN.h" |
2 | #include "perl.h" | |
6d4a7be2 | 3 | |
4 | /* | |
5 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> | |
6 | * The main guts of traverse_isa was actually copied from gv_fetchmeth | |
7 | */ | |
8 | ||
76e3520e | 9 | STATIC SV * |
8ac85365 | 10 | isa_lookup(HV *stash, char *name, int len, int level) |
6d4a7be2 | 11 | { |
12 | AV* av; | |
13 | GV* gv; | |
14 | GV** gvp; | |
15 | HV* hv = Nullhv; | |
16 | ||
17 | if (!stash) | |
3280af22 | 18 | return &PL_sv_undef; |
6d4a7be2 | 19 | |
20 | if(strEQ(HvNAME(stash), name)) | |
3280af22 | 21 | return &PL_sv_yes; |
6d4a7be2 | 22 | |
23 | if (level > 100) | |
3e0ccd42 | 24 | croak("Recursive inheritance detected in package '%s'", HvNAME(stash)); |
6d4a7be2 | 25 | |
26 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); | |
27 | ||
3280af22 | 28 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) { |
6d4a7be2 | 29 | SV* sv; |
30 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); | |
3280af22 | 31 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) |
6d4a7be2 | 32 | return sv; |
33 | } | |
34 | ||
35 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); | |
36 | ||
3280af22 | 37 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
6d4a7be2 | 38 | if(!hv) { |
39 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); | |
40 | ||
41 | gv = *gvp; | |
42 | ||
43 | if (SvTYPE(gv) != SVt_PVGV) | |
44 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); | |
45 | ||
46 | hv = GvHVn(gv); | |
47 | } | |
48 | if(hv) { | |
49 | SV** svp = AvARRAY(av); | |
93965878 NIS |
50 | /* NOTE: No support for tied ISA */ |
51 | I32 items = AvFILLp(av) + 1; | |
6d4a7be2 | 52 | while (items--) { |
53 | SV* sv = *svp++; | |
54 | HV* basestash = gv_stashsv(sv, FALSE); | |
55 | if (!basestash) { | |
d008e5eb | 56 | dTHR; |
599cee73 PM |
57 | if (ckWARN(WARN_MISC)) |
58 | warner(WARN_SYNTAX, | |
59 | "Can't locate package %s for @%s::ISA", | |
6d4a7be2 | 60 | SvPVX(sv), HvNAME(stash)); |
61 | continue; | |
62 | } | |
3280af22 NIS |
63 | if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) { |
64 | (void)hv_store(hv,name,len,&PL_sv_yes,0); | |
65 | return &PL_sv_yes; | |
6d4a7be2 | 66 | } |
67 | } | |
3280af22 | 68 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
6d4a7be2 | 69 | } |
70 | } | |
71 | ||
e09f3e01 | 72 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 | 73 | } |
74 | ||
55497cff | 75 | bool |
8ac85365 | 76 | sv_derived_from(SV *sv, char *name) |
55497cff | 77 | { |
78 | SV *rv; | |
79 | char *type; | |
80 | HV *stash; | |
81 | ||
82 | stash = Nullhv; | |
83 | type = Nullch; | |
84 | ||
85 | if (SvGMAGICAL(sv)) | |
86 | mg_get(sv) ; | |
87 | ||
88 | if (SvROK(sv)) { | |
89 | sv = SvRV(sv); | |
90 | type = sv_reftype(sv,0); | |
91 | if(SvOBJECT(sv)) | |
92 | stash = SvSTASH(sv); | |
93 | } | |
94 | else { | |
95 | stash = gv_stashsv(sv, FALSE); | |
96 | } | |
97 | ||
98 | return (type && strEQ(type,name)) || | |
3280af22 | 99 | (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes) |
55497cff | 100 | ? TRUE |
101 | : FALSE ; | |
102 | ||
103 | } | |
104 | ||
565764a8 DL |
105 | #ifdef PERL_OBJECT |
106 | #define NO_XSLOCKS | |
107 | #endif /* PERL_OBJECT */ | |
108 | ||
76e3520e | 109 | #include "XSUB.h" |
55497cff | 110 | |
6d4a7be2 | 111 | XS(XS_UNIVERSAL_isa) |
112 | { | |
113 | dXSARGS; | |
55497cff | 114 | SV *sv; |
115 | char *name; | |
6d4a7be2 | 116 | |
117 | if (items != 2) | |
118 | croak("Usage: UNIVERSAL::isa(reference, kind)"); | |
119 | ||
120 | sv = ST(0); | |
3280af22 | 121 | name = (char *)SvPV(ST(1),PL_na); |
6d4a7be2 | 122 | |
54310121 | 123 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 124 | XSRETURN(1); |
125 | } | |
126 | ||
6d4a7be2 | 127 | XS(XS_UNIVERSAL_can) |
128 | { | |
129 | dXSARGS; | |
130 | SV *sv; | |
131 | char *name; | |
132 | SV *rv; | |
6f08146e | 133 | HV *pkg = NULL; |
6d4a7be2 | 134 | |
135 | if (items != 2) | |
136 | croak("Usage: UNIVERSAL::can(object-ref, method)"); | |
137 | ||
138 | sv = ST(0); | |
3280af22 NIS |
139 | name = (char *)SvPV(ST(1),PL_na); |
140 | rv = &PL_sv_undef; | |
6d4a7be2 | 141 | |
6f08146e NIS |
142 | if(SvROK(sv)) { |
143 | sv = (SV*)SvRV(sv); | |
144 | if(SvOBJECT(sv)) | |
145 | pkg = SvSTASH(sv); | |
146 | } | |
147 | else { | |
148 | pkg = gv_stashsv(sv, FALSE); | |
149 | } | |
150 | ||
151 | if (pkg) { | |
dc848c6f | 152 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
153 | if (gv && isGV(gv)) | |
154 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 155 | } |
156 | ||
157 | ST(0) = rv; | |
158 | XSRETURN(1); | |
159 | } | |
160 | ||
6d4a7be2 | 161 | XS(XS_UNIVERSAL_VERSION) |
162 | { | |
163 | dXSARGS; | |
164 | HV *pkg; | |
165 | GV **gvp; | |
166 | GV *gv; | |
167 | SV *sv; | |
168 | char *undef; | |
13826f2c | 169 | double req; |
6d4a7be2 | 170 | |
171 | if(SvROK(ST(0))) { | |
172 | sv = (SV*)SvRV(ST(0)); | |
173 | if(!SvOBJECT(sv)) | |
174 | croak("Cannot find version of an unblessed reference"); | |
175 | pkg = SvSTASH(sv); | |
176 | } | |
177 | else { | |
178 | pkg = gv_stashsv(ST(0), FALSE); | |
179 | } | |
180 | ||
181 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
182 | ||
3280af22 | 183 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (sv = GvSV(gv))) { |
6d4a7be2 | 184 | SV *nsv = sv_newmortal(); |
185 | sv_setsv(nsv, sv); | |
186 | sv = nsv; | |
187 | undef = Nullch; | |
188 | } | |
189 | else { | |
3280af22 | 190 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 | 191 | undef = "(undef)"; |
192 | } | |
193 | ||
13826f2c | 194 | if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) |
6d4a7be2 | 195 | croak("%s version %s required--this is only version %s", |
3280af22 | 196 | HvNAME(pkg), SvPV(ST(1),PL_na), undef ? undef : SvPV(sv,PL_na)); |
6d4a7be2 | 197 | |
198 | ST(0) = sv; | |
199 | ||
200 | XSRETURN(1); | |
201 | } | |
202 | ||
76e3520e GS |
203 | #ifdef PERL_OBJECT |
204 | #undef boot_core_UNIVERSAL | |
205 | #define boot_core_UNIVERSAL CPerlObj::Perl_boot_core_UNIVERSAL | |
206 | #define pPerl this | |
207 | #endif | |
208 | ||
6d4a7be2 | 209 | void |
8ac85365 | 210 | boot_core_UNIVERSAL(void) |
6d4a7be2 | 211 | { |
212 | char *file = __FILE__; | |
213 | ||
214 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); | |
215 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); | |
6d4a7be2 | 216 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
217 | } |