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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; | |
46e4b22b | 17 | SV* subgen = Nullsv; |
6d4a7be2 | 18 | |
19 | if (!stash) | |
3280af22 | 20 | return &PL_sv_undef; |
6d4a7be2 | 21 | |
46e4b22b | 22 | if (strEQ(HvNAME(stash), name)) |
3280af22 | 23 | return &PL_sv_yes; |
6d4a7be2 | 24 | |
25 | if (level > 100) | |
46e4b22b GS |
26 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
27 | HvNAME(stash)); | |
6d4a7be2 | 28 | |
29 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); | |
30 | ||
46e4b22b GS |
31 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv)) |
32 | && (hv = GvHV(gv))) | |
33 | { | |
34 | if (SvIV(subgen) == PL_sub_generation) { | |
35 | SV* sv; | |
36 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); | |
37 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) { | |
38 | DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n", | |
39 | name, HvNAME(stash)) ); | |
40 | return sv; | |
41 | } | |
42 | } | |
43 | else { | |
44 | DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n", | |
45 | HvNAME(stash)) ); | |
46 | hv_clear(hv); | |
47 | sv_setiv(subgen, PL_sub_generation); | |
48 | } | |
6d4a7be2 | 49 | } |
50 | ||
51 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); | |
46e4b22b | 52 | |
3280af22 | 53 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
46e4b22b | 54 | if (!hv || !subgen) { |
6d4a7be2 | 55 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
56 | ||
57 | gv = *gvp; | |
58 | ||
59 | if (SvTYPE(gv) != SVt_PVGV) | |
60 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); | |
61 | ||
46e4b22b GS |
62 | if (!hv) |
63 | hv = GvHVn(gv); | |
64 | if (!subgen) { | |
65 | subgen = newSViv(PL_sub_generation); | |
66 | GvSV(gv) = subgen; | |
67 | } | |
6d4a7be2 | 68 | } |
46e4b22b | 69 | if (hv) { |
6d4a7be2 | 70 | SV** svp = AvARRAY(av); |
93965878 NIS |
71 | /* NOTE: No support for tied ISA */ |
72 | I32 items = AvFILLp(av) + 1; | |
6d4a7be2 | 73 | while (items--) { |
74 | SV* sv = *svp++; | |
75 | HV* basestash = gv_stashsv(sv, FALSE); | |
76 | if (!basestash) { | |
599cee73 | 77 | if (ckWARN(WARN_MISC)) |
cea2e8a9 | 78 | Perl_warner(aTHX_ WARN_SYNTAX, |
599cee73 | 79 | "Can't locate package %s for @%s::ISA", |
6d4a7be2 | 80 | SvPVX(sv), HvNAME(stash)); |
81 | continue; | |
82 | } | |
46e4b22b | 83 | if (&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) { |
3280af22 NIS |
84 | (void)hv_store(hv,name,len,&PL_sv_yes,0); |
85 | return &PL_sv_yes; | |
6d4a7be2 | 86 | } |
87 | } | |
3280af22 | 88 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
6d4a7be2 | 89 | } |
90 | } | |
91 | ||
e09f3e01 | 92 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 | 93 | } |
94 | ||
954c1994 GS |
95 | /* |
96 | =for apidoc sv_derived_from | |
97 | ||
98 | Returns a boolean indicating whether the SV is derived from the specified | |
99 | class. This is the function that implements C<UNIVERSAL::isa>. It works | |
100 | for class names as well as for objects. | |
101 | ||
102 | =cut | |
103 | */ | |
104 | ||
55497cff | 105 | bool |
864dbfa3 | 106 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
55497cff | 107 | { |
55497cff | 108 | char *type; |
109 | HV *stash; | |
46e4b22b | 110 | |
55497cff | 111 | stash = Nullhv; |
112 | type = Nullch; | |
46e4b22b | 113 | |
55497cff | 114 | if (SvGMAGICAL(sv)) |
115 | mg_get(sv) ; | |
116 | ||
117 | if (SvROK(sv)) { | |
118 | sv = SvRV(sv); | |
119 | type = sv_reftype(sv,0); | |
46e4b22b | 120 | if (SvOBJECT(sv)) |
55497cff | 121 | stash = SvSTASH(sv); |
122 | } | |
123 | else { | |
124 | stash = gv_stashsv(sv, FALSE); | |
125 | } | |
46e4b22b | 126 | |
55497cff | 127 | return (type && strEQ(type,name)) || |
3280af22 | 128 | (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes) |
55497cff | 129 | ? TRUE |
130 | : FALSE ; | |
55497cff | 131 | } |
132 | ||
0cb96387 GS |
133 | void XS_UNIVERSAL_isa(pTHXo_ CV *cv); |
134 | void XS_UNIVERSAL_can(pTHXo_ CV *cv); | |
135 | void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv); | |
136 | ||
137 | void | |
138 | Perl_boot_core_UNIVERSAL(pTHX) | |
139 | { | |
140 | char *file = __FILE__; | |
141 | ||
142 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); | |
143 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); | |
144 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); | |
145 | } | |
146 | ||
76e3520e | 147 | #include "XSUB.h" |
55497cff | 148 | |
6d4a7be2 | 149 | XS(XS_UNIVERSAL_isa) |
150 | { | |
151 | dXSARGS; | |
55497cff | 152 | SV *sv; |
153 | char *name; | |
2d8e6c8d | 154 | STRLEN n_a; |
6d4a7be2 | 155 | |
156 | if (items != 2) | |
cea2e8a9 | 157 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
6d4a7be2 | 158 | |
159 | sv = ST(0); | |
f8f70380 | 160 | |
d3f7f2b2 GS |
161 | if (SvGMAGICAL(sv)) |
162 | mg_get(sv); | |
163 | ||
aca069ec | 164 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
f8f70380 GS |
165 | XSRETURN_UNDEF; |
166 | ||
2d8e6c8d | 167 | name = (char *)SvPV(ST(1),n_a); |
6d4a7be2 | 168 | |
54310121 | 169 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 170 | XSRETURN(1); |
171 | } | |
172 | ||
6d4a7be2 | 173 | XS(XS_UNIVERSAL_can) |
174 | { | |
175 | dXSARGS; | |
176 | SV *sv; | |
177 | char *name; | |
178 | SV *rv; | |
6f08146e | 179 | HV *pkg = NULL; |
2d8e6c8d | 180 | STRLEN n_a; |
6d4a7be2 | 181 | |
182 | if (items != 2) | |
cea2e8a9 | 183 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
6d4a7be2 | 184 | |
185 | sv = ST(0); | |
f8f70380 | 186 | |
d3f7f2b2 GS |
187 | if (SvGMAGICAL(sv)) |
188 | mg_get(sv); | |
189 | ||
aca069ec | 190 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
f8f70380 GS |
191 | XSRETURN_UNDEF; |
192 | ||
2d8e6c8d | 193 | name = (char *)SvPV(ST(1),n_a); |
3280af22 | 194 | rv = &PL_sv_undef; |
6d4a7be2 | 195 | |
46e4b22b | 196 | if (SvROK(sv)) { |
6f08146e | 197 | sv = (SV*)SvRV(sv); |
46e4b22b | 198 | if (SvOBJECT(sv)) |
6f08146e NIS |
199 | pkg = SvSTASH(sv); |
200 | } | |
201 | else { | |
202 | pkg = gv_stashsv(sv, FALSE); | |
203 | } | |
204 | ||
205 | if (pkg) { | |
dc848c6f | 206 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
207 | if (gv && isGV(gv)) | |
208 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 209 | } |
210 | ||
211 | ST(0) = rv; | |
212 | XSRETURN(1); | |
213 | } | |
214 | ||
6d4a7be2 | 215 | XS(XS_UNIVERSAL_VERSION) |
216 | { | |
217 | dXSARGS; | |
218 | HV *pkg; | |
219 | GV **gvp; | |
220 | GV *gv; | |
221 | SV *sv; | |
222 | char *undef; | |
223 | ||
1571675a | 224 | if (SvROK(ST(0))) { |
6d4a7be2 | 225 | sv = (SV*)SvRV(ST(0)); |
1571675a | 226 | if (!SvOBJECT(sv)) |
cea2e8a9 | 227 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
6d4a7be2 | 228 | pkg = SvSTASH(sv); |
229 | } | |
230 | else { | |
231 | pkg = gv_stashsv(ST(0), FALSE); | |
232 | } | |
233 | ||
234 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
235 | ||
d4bea2fb | 236 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
6d4a7be2 | 237 | SV *nsv = sv_newmortal(); |
238 | sv_setsv(nsv, sv); | |
239 | sv = nsv; | |
240 | undef = Nullch; | |
241 | } | |
242 | else { | |
3280af22 | 243 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 | 244 | undef = "(undef)"; |
245 | } | |
246 | ||
1571675a GS |
247 | if (items > 1) { |
248 | STRLEN len; | |
249 | SV *req = ST(1); | |
250 | ||
251 | if (undef) | |
252 | Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed", | |
253 | HvNAME(pkg), HvNAME(pkg)); | |
254 | ||
255 | if (!SvNIOK(sv) && SvPOK(sv)) { | |
256 | char *str = SvPVx(sv,len); | |
257 | while (len) { | |
258 | --len; | |
259 | /* XXX could DWIM "1.2.3" here */ | |
260 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') | |
261 | break; | |
262 | } | |
263 | if (len) { | |
4305d8ab | 264 | if (SvNOK(req) && SvPOK(req)) { |
1571675a GS |
265 | /* they said C<use Foo v1.2.3> and $Foo::VERSION |
266 | * doesn't look like a float: do string compare */ | |
267 | if (sv_cmp(req,sv) == 1) { | |
d2560b70 RB |
268 | Perl_croak(aTHX_ "%s v%"VDf" required--" |
269 | "this is only v%"VDf, | |
1571675a GS |
270 | HvNAME(pkg), req, sv); |
271 | } | |
272 | goto finish; | |
273 | } | |
274 | /* they said C<use Foo 1.002_003> and $Foo::VERSION | |
275 | * doesn't look like a float: force numeric compare */ | |
155aba94 | 276 | (void)SvUPGRADE(sv, SVt_PVNV); |
1571675a GS |
277 | SvNVX(sv) = str_to_version(sv); |
278 | SvPOK_off(sv); | |
279 | SvNOK_on(sv); | |
280 | } | |
281 | } | |
282 | /* if we get here, we're looking for a numeric comparison, | |
283 | * so force the required version into a float, even if they | |
284 | * said C<use Foo v1.2.3> */ | |
4305d8ab | 285 | if (SvNOK(req) && SvPOK(req)) { |
1571675a GS |
286 | NV n = SvNV(req); |
287 | req = sv_newmortal(); | |
288 | sv_setnv(req, n); | |
289 | } | |
290 | ||
291 | if (SvNV(req) > SvNV(sv)) | |
292 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", | |
293 | HvNAME(pkg), SvPV(req,len), SvPV(sv,len)); | |
2d8e6c8d | 294 | } |
6d4a7be2 | 295 | |
1571675a | 296 | finish: |
6d4a7be2 | 297 | ST(0) = sv; |
298 | ||
299 | XSRETURN(1); | |
300 | } | |
301 |