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1 | #include "EXTERN.h" |
864dbfa3 |
2 | #define PERL_IN_UNIVERSAL_C |
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3 | #include "perl.h" |
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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 | |
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10 | STATIC SV * |
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11 | S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level) |
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12 | { |
13 | AV* av; |
14 | GV* gv; |
15 | GV** gvp; |
16 | HV* hv = Nullhv; |
17 | |
18 | if (!stash) |
3280af22 |
19 | return &PL_sv_undef; |
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20 | |
21 | if(strEQ(HvNAME(stash), name)) |
3280af22 |
22 | return &PL_sv_yes; |
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23 | |
24 | if (level > 100) |
cea2e8a9 |
25 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash)); |
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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; |
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 */ |
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; |
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67 | } |
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 | } |
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 | |
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86 | bool |
864dbfa3 |
87 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
55497cff |
88 | { |
55497cff |
89 | char *type; |
90 | HV *stash; |
91 | |
92 | stash = Nullhv; |
93 | type = Nullch; |
94 | |
95 | if (SvGMAGICAL(sv)) |
96 | mg_get(sv) ; |
97 | |
98 | if (SvROK(sv)) { |
99 | sv = SvRV(sv); |
100 | type = sv_reftype(sv,0); |
101 | if(SvOBJECT(sv)) |
102 | stash = SvSTASH(sv); |
103 | } |
104 | else { |
105 | stash = gv_stashsv(sv, FALSE); |
106 | } |
107 | |
108 | return (type && strEQ(type,name)) || |
3280af22 |
109 | (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes) |
55497cff |
110 | ? TRUE |
111 | : FALSE ; |
55497cff |
112 | } |
113 | |
0cb96387 |
114 | void XS_UNIVERSAL_isa(pTHXo_ CV *cv); |
115 | void XS_UNIVERSAL_can(pTHXo_ CV *cv); |
116 | void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv); |
117 | |
118 | void |
119 | Perl_boot_core_UNIVERSAL(pTHX) |
120 | { |
121 | char *file = __FILE__; |
122 | |
123 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
124 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
125 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
126 | } |
127 | |
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128 | #include "XSUB.h" |
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129 | |
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130 | XS(XS_UNIVERSAL_isa) |
131 | { |
132 | dXSARGS; |
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133 | SV *sv; |
134 | char *name; |
2d8e6c8d |
135 | STRLEN n_a; |
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136 | |
137 | if (items != 2) |
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138 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
6d4a7be2 |
139 | |
140 | sv = ST(0); |
f8f70380 |
141 | |
d3f7f2b2 |
142 | if (SvGMAGICAL(sv)) |
143 | mg_get(sv); |
144 | |
f8f70380 |
145 | if (!SvOK(sv) || !(SvROK(sv) || SvCUR(sv))) |
146 | XSRETURN_UNDEF; |
147 | |
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148 | name = (char *)SvPV(ST(1),n_a); |
6d4a7be2 |
149 | |
54310121 |
150 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 |
151 | XSRETURN(1); |
152 | } |
153 | |
6d4a7be2 |
154 | XS(XS_UNIVERSAL_can) |
155 | { |
156 | dXSARGS; |
157 | SV *sv; |
158 | char *name; |
159 | SV *rv; |
6f08146e |
160 | HV *pkg = NULL; |
2d8e6c8d |
161 | STRLEN n_a; |
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162 | |
163 | if (items != 2) |
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164 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
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165 | |
166 | sv = ST(0); |
f8f70380 |
167 | |
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168 | if (SvGMAGICAL(sv)) |
169 | mg_get(sv); |
170 | |
f8f70380 |
171 | if (!SvOK(sv) || !(SvROK(sv) || SvCUR(sv))) |
172 | XSRETURN_UNDEF; |
173 | |
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174 | name = (char *)SvPV(ST(1),n_a); |
3280af22 |
175 | rv = &PL_sv_undef; |
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176 | |
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177 | if(SvROK(sv)) { |
178 | sv = (SV*)SvRV(sv); |
179 | if(SvOBJECT(sv)) |
180 | pkg = SvSTASH(sv); |
181 | } |
182 | else { |
183 | pkg = gv_stashsv(sv, FALSE); |
184 | } |
185 | |
186 | if (pkg) { |
dc848c6f |
187 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
188 | if (gv && isGV(gv)) |
189 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); |
6d4a7be2 |
190 | } |
191 | |
192 | ST(0) = rv; |
193 | XSRETURN(1); |
194 | } |
195 | |
6d4a7be2 |
196 | XS(XS_UNIVERSAL_VERSION) |
197 | { |
198 | dXSARGS; |
199 | HV *pkg; |
200 | GV **gvp; |
201 | GV *gv; |
202 | SV *sv; |
203 | char *undef; |
204 | |
1571675a |
205 | if (SvROK(ST(0))) { |
6d4a7be2 |
206 | sv = (SV*)SvRV(ST(0)); |
1571675a |
207 | if (!SvOBJECT(sv)) |
cea2e8a9 |
208 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
6d4a7be2 |
209 | pkg = SvSTASH(sv); |
210 | } |
211 | else { |
212 | pkg = gv_stashsv(ST(0), FALSE); |
213 | } |
214 | |
215 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
216 | |
d4bea2fb |
217 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
6d4a7be2 |
218 | SV *nsv = sv_newmortal(); |
219 | sv_setsv(nsv, sv); |
220 | sv = nsv; |
221 | undef = Nullch; |
222 | } |
223 | else { |
3280af22 |
224 | sv = (SV*)&PL_sv_undef; |
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225 | undef = "(undef)"; |
226 | } |
227 | |
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228 | if (items > 1) { |
229 | STRLEN len; |
230 | SV *req = ST(1); |
231 | |
232 | if (undef) |
233 | Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed", |
234 | HvNAME(pkg), HvNAME(pkg)); |
235 | |
236 | if (!SvNIOK(sv) && SvPOK(sv)) { |
237 | char *str = SvPVx(sv,len); |
238 | while (len) { |
239 | --len; |
240 | /* XXX could DWIM "1.2.3" here */ |
241 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') |
242 | break; |
243 | } |
244 | if (len) { |
245 | if (SvNIOKp(req) && SvPOK(req)) { |
246 | /* they said C<use Foo v1.2.3> and $Foo::VERSION |
247 | * doesn't look like a float: do string compare */ |
248 | if (sv_cmp(req,sv) == 1) { |
249 | Perl_croak(aTHX_ "%s version v%vd required--" |
250 | "this is only version v%vd", |
251 | HvNAME(pkg), req, sv); |
252 | } |
253 | goto finish; |
254 | } |
255 | /* they said C<use Foo 1.002_003> and $Foo::VERSION |
256 | * doesn't look like a float: force numeric compare */ |
155aba94 |
257 | (void)SvUPGRADE(sv, SVt_PVNV); |
1571675a |
258 | SvNVX(sv) = str_to_version(sv); |
259 | SvPOK_off(sv); |
260 | SvNOK_on(sv); |
261 | } |
262 | } |
263 | /* if we get here, we're looking for a numeric comparison, |
264 | * so force the required version into a float, even if they |
265 | * said C<use Foo v1.2.3> */ |
266 | if (SvNIOKp(req) && SvPOK(req)) { |
267 | NV n = SvNV(req); |
268 | req = sv_newmortal(); |
269 | sv_setnv(req, n); |
270 | } |
271 | |
272 | if (SvNV(req) > SvNV(sv)) |
273 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
274 | HvNAME(pkg), SvPV(req,len), SvPV(sv,len)); |
2d8e6c8d |
275 | } |
6d4a7be2 |
276 | |
1571675a |
277 | finish: |
6d4a7be2 |
278 | ST(0) = sv; |
279 | |
280 | XSRETURN(1); |
281 | } |
282 | |