Commit | Line | Data |
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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; | |
17 | ||
18 | if (!stash) | |
3280af22 | 19 | return &PL_sv_undef; |
6d4a7be2 | 20 | |
21 | if(strEQ(HvNAME(stash), name)) | |
3280af22 | 22 | return &PL_sv_yes; |
6d4a7be2 | 23 | |
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; |
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 NIS |
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 NIS |
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 | } |
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 GS |
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 | { |
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 GS |
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 | ||
76e3520e | 128 | #include "XSUB.h" |
55497cff | 129 | |
6d4a7be2 | 130 | XS(XS_UNIVERSAL_isa) |
131 | { | |
132 | dXSARGS; | |
55497cff | 133 | SV *sv; |
134 | char *name; | |
2d8e6c8d | 135 | STRLEN n_a; |
6d4a7be2 | 136 | |
137 | if (items != 2) | |
cea2e8a9 | 138 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
6d4a7be2 | 139 | |
140 | sv = ST(0); | |
f8f70380 GS |
141 | |
142 | if (!SvOK(sv) || !(SvROK(sv) || SvCUR(sv))) | |
143 | XSRETURN_UNDEF; | |
144 | ||
2d8e6c8d | 145 | name = (char *)SvPV(ST(1),n_a); |
6d4a7be2 | 146 | |
54310121 | 147 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 148 | XSRETURN(1); |
149 | } | |
150 | ||
6d4a7be2 | 151 | XS(XS_UNIVERSAL_can) |
152 | { | |
153 | dXSARGS; | |
154 | SV *sv; | |
155 | char *name; | |
156 | SV *rv; | |
6f08146e | 157 | HV *pkg = NULL; |
2d8e6c8d | 158 | STRLEN n_a; |
6d4a7be2 | 159 | |
160 | if (items != 2) | |
cea2e8a9 | 161 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
6d4a7be2 | 162 | |
163 | sv = ST(0); | |
f8f70380 GS |
164 | |
165 | if (!SvOK(sv) || !(SvROK(sv) || SvCUR(sv))) | |
166 | XSRETURN_UNDEF; | |
167 | ||
2d8e6c8d | 168 | name = (char *)SvPV(ST(1),n_a); |
3280af22 | 169 | rv = &PL_sv_undef; |
6d4a7be2 | 170 | |
6f08146e NIS |
171 | if(SvROK(sv)) { |
172 | sv = (SV*)SvRV(sv); | |
173 | if(SvOBJECT(sv)) | |
174 | pkg = SvSTASH(sv); | |
175 | } | |
176 | else { | |
177 | pkg = gv_stashsv(sv, FALSE); | |
178 | } | |
179 | ||
180 | if (pkg) { | |
dc848c6f | 181 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
182 | if (gv && isGV(gv)) | |
183 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 184 | } |
185 | ||
186 | ST(0) = rv; | |
187 | XSRETURN(1); | |
188 | } | |
189 | ||
6d4a7be2 | 190 | XS(XS_UNIVERSAL_VERSION) |
191 | { | |
192 | dXSARGS; | |
193 | HV *pkg; | |
194 | GV **gvp; | |
195 | GV *gv; | |
196 | SV *sv; | |
197 | char *undef; | |
198 | ||
1571675a | 199 | if (SvROK(ST(0))) { |
6d4a7be2 | 200 | sv = (SV*)SvRV(ST(0)); |
1571675a | 201 | if (!SvOBJECT(sv)) |
cea2e8a9 | 202 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
6d4a7be2 | 203 | pkg = SvSTASH(sv); |
204 | } | |
205 | else { | |
206 | pkg = gv_stashsv(ST(0), FALSE); | |
207 | } | |
208 | ||
209 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
210 | ||
d4bea2fb | 211 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
6d4a7be2 | 212 | SV *nsv = sv_newmortal(); |
213 | sv_setsv(nsv, sv); | |
214 | sv = nsv; | |
215 | undef = Nullch; | |
216 | } | |
217 | else { | |
3280af22 | 218 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 | 219 | undef = "(undef)"; |
220 | } | |
221 | ||
1571675a GS |
222 | if (items > 1) { |
223 | STRLEN len; | |
224 | SV *req = ST(1); | |
225 | ||
226 | if (undef) | |
227 | Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed", | |
228 | HvNAME(pkg), HvNAME(pkg)); | |
229 | ||
230 | if (!SvNIOK(sv) && SvPOK(sv)) { | |
231 | char *str = SvPVx(sv,len); | |
232 | while (len) { | |
233 | --len; | |
234 | /* XXX could DWIM "1.2.3" here */ | |
235 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') | |
236 | break; | |
237 | } | |
238 | if (len) { | |
239 | if (SvNIOKp(req) && SvPOK(req)) { | |
240 | /* they said C<use Foo v1.2.3> and $Foo::VERSION | |
241 | * doesn't look like a float: do string compare */ | |
242 | if (sv_cmp(req,sv) == 1) { | |
243 | Perl_croak(aTHX_ "%s version v%vd required--" | |
244 | "this is only version v%vd", | |
245 | HvNAME(pkg), req, sv); | |
246 | } | |
247 | goto finish; | |
248 | } | |
249 | /* they said C<use Foo 1.002_003> and $Foo::VERSION | |
250 | * doesn't look like a float: force numeric compare */ | |
155aba94 | 251 | (void)SvUPGRADE(sv, SVt_PVNV); |
1571675a GS |
252 | SvNVX(sv) = str_to_version(sv); |
253 | SvPOK_off(sv); | |
254 | SvNOK_on(sv); | |
255 | } | |
256 | } | |
257 | /* if we get here, we're looking for a numeric comparison, | |
258 | * so force the required version into a float, even if they | |
259 | * said C<use Foo v1.2.3> */ | |
260 | if (SvNIOKp(req) && SvPOK(req)) { | |
261 | NV n = SvNV(req); | |
262 | req = sv_newmortal(); | |
263 | sv_setnv(req, n); | |
264 | } | |
265 | ||
266 | if (SvNV(req) > SvNV(sv)) | |
267 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", | |
268 | HvNAME(pkg), SvPV(req,len), SvPV(sv,len)); | |
2d8e6c8d | 269 | } |
6d4a7be2 | 270 | |
1571675a | 271 | finish: |
6d4a7be2 | 272 | ST(0) = sv; |
273 | ||
274 | XSRETURN(1); | |
275 | } | |
276 |