Commit | Line | Data |
d6376244 |
1 | /* universal.c |
2 | * |
3 | * Copyright (c) 1997-2002, Larry Wall |
4 | * |
5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
7 | * |
8 | */ |
9 | |
d31a8517 |
10 | /* |
11 | * "The roots of those mountains must be roots indeed; there must be |
12 | * great secrets buried there which have not been discovered since the |
13 | * beginning." --Gandalf, relating Gollum's story |
14 | */ |
15 | |
6d4a7be2 |
16 | #include "EXTERN.h" |
864dbfa3 |
17 | #define PERL_IN_UNIVERSAL_C |
6d4a7be2 |
18 | #include "perl.h" |
6d4a7be2 |
19 | |
20 | /* |
21 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> |
22 | * The main guts of traverse_isa was actually copied from gv_fetchmeth |
23 | */ |
24 | |
76e3520e |
25 | STATIC SV * |
301daebc |
26 | S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash, |
27 | int len, int level) |
6d4a7be2 |
28 | { |
29 | AV* av; |
30 | GV* gv; |
31 | GV** gvp; |
32 | HV* hv = Nullhv; |
46e4b22b |
33 | SV* subgen = Nullsv; |
6d4a7be2 |
34 | |
301daebc |
35 | /* A stash/class can go by many names (ie. User == main::User), so |
36 | we compare the stash itself just in case */ |
37 | if (name_stash && (stash == name_stash)) |
38 | return &PL_sv_yes; |
6d4a7be2 |
39 | |
46e4b22b |
40 | if (strEQ(HvNAME(stash), name)) |
3280af22 |
41 | return &PL_sv_yes; |
6d4a7be2 |
42 | |
43 | if (level > 100) |
46e4b22b |
44 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", |
45 | HvNAME(stash)); |
6d4a7be2 |
46 | |
47 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); |
48 | |
46e4b22b |
49 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv)) |
50 | && (hv = GvHV(gv))) |
51 | { |
52 | if (SvIV(subgen) == PL_sub_generation) { |
53 | SV* sv; |
54 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); |
55 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) { |
56 | DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n", |
57 | name, HvNAME(stash)) ); |
58 | return sv; |
59 | } |
60 | } |
61 | else { |
62 | DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n", |
63 | HvNAME(stash)) ); |
64 | hv_clear(hv); |
65 | sv_setiv(subgen, PL_sub_generation); |
66 | } |
6d4a7be2 |
67 | } |
68 | |
69 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); |
46e4b22b |
70 | |
3280af22 |
71 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
46e4b22b |
72 | if (!hv || !subgen) { |
6d4a7be2 |
73 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
74 | |
75 | gv = *gvp; |
76 | |
77 | if (SvTYPE(gv) != SVt_PVGV) |
78 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); |
79 | |
46e4b22b |
80 | if (!hv) |
81 | hv = GvHVn(gv); |
82 | if (!subgen) { |
83 | subgen = newSViv(PL_sub_generation); |
84 | GvSV(gv) = subgen; |
85 | } |
6d4a7be2 |
86 | } |
46e4b22b |
87 | if (hv) { |
6d4a7be2 |
88 | SV** svp = AvARRAY(av); |
93965878 |
89 | /* NOTE: No support for tied ISA */ |
90 | I32 items = AvFILLp(av) + 1; |
6d4a7be2 |
91 | while (items--) { |
92 | SV* sv = *svp++; |
93 | HV* basestash = gv_stashsv(sv, FALSE); |
94 | if (!basestash) { |
599cee73 |
95 | if (ckWARN(WARN_MISC)) |
cea2e8a9 |
96 | Perl_warner(aTHX_ WARN_SYNTAX, |
599cee73 |
97 | "Can't locate package %s for @%s::ISA", |
6d4a7be2 |
98 | SvPVX(sv), HvNAME(stash)); |
99 | continue; |
100 | } |
301daebc |
101 | if (&PL_sv_yes == isa_lookup(basestash, name, name_stash, |
102 | len, level + 1)) { |
3280af22 |
103 | (void)hv_store(hv,name,len,&PL_sv_yes,0); |
104 | return &PL_sv_yes; |
6d4a7be2 |
105 | } |
106 | } |
3280af22 |
107 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
6d4a7be2 |
108 | } |
109 | } |
110 | |
e09f3e01 |
111 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 |
112 | } |
113 | |
954c1994 |
114 | /* |
ccfc67b7 |
115 | =head1 SV Manipulation Functions |
116 | |
954c1994 |
117 | =for apidoc sv_derived_from |
118 | |
119 | Returns a boolean indicating whether the SV is derived from the specified |
120 | class. This is the function that implements C<UNIVERSAL::isa>. It works |
121 | for class names as well as for objects. |
122 | |
123 | =cut |
124 | */ |
125 | |
55497cff |
126 | bool |
864dbfa3 |
127 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
55497cff |
128 | { |
55497cff |
129 | char *type; |
130 | HV *stash; |
301daebc |
131 | HV *name_stash; |
46e4b22b |
132 | |
55497cff |
133 | stash = Nullhv; |
134 | type = Nullch; |
46e4b22b |
135 | |
55497cff |
136 | if (SvGMAGICAL(sv)) |
137 | mg_get(sv) ; |
138 | |
139 | if (SvROK(sv)) { |
140 | sv = SvRV(sv); |
141 | type = sv_reftype(sv,0); |
46e4b22b |
142 | if (SvOBJECT(sv)) |
55497cff |
143 | stash = SvSTASH(sv); |
144 | } |
145 | else { |
146 | stash = gv_stashsv(sv, FALSE); |
147 | } |
46e4b22b |
148 | |
301daebc |
149 | name_stash = gv_stashpv(name, FALSE); |
150 | |
55497cff |
151 | return (type && strEQ(type,name)) || |
301daebc |
152 | (stash && isa_lookup(stash, name, name_stash, strlen(name), 0) |
153 | == &PL_sv_yes) |
55497cff |
154 | ? TRUE |
155 | : FALSE ; |
55497cff |
156 | } |
157 | |
1b026014 |
158 | #include "XSUB.h" |
159 | |
acfe0abc |
160 | void XS_UNIVERSAL_isa(pTHX_ CV *cv); |
161 | void XS_UNIVERSAL_can(pTHX_ CV *cv); |
162 | void XS_UNIVERSAL_VERSION(pTHX_ CV *cv); |
1b026014 |
163 | XS(XS_utf8_valid); |
164 | XS(XS_utf8_encode); |
165 | XS(XS_utf8_decode); |
166 | XS(XS_utf8_upgrade); |
167 | XS(XS_utf8_downgrade); |
168 | XS(XS_utf8_unicode_to_native); |
169 | XS(XS_utf8_native_to_unicode); |
1b1f1335 |
170 | XS(XS_access_readonly); |
0cb96387 |
171 | |
172 | void |
173 | Perl_boot_core_UNIVERSAL(pTHX) |
174 | { |
175 | char *file = __FILE__; |
176 | |
177 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
178 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
179 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
1b026014 |
180 | newXS("utf8::valid", XS_utf8_valid, file); |
181 | newXS("utf8::encode", XS_utf8_encode, file); |
182 | newXS("utf8::decode", XS_utf8_decode, file); |
183 | newXS("utf8::upgrade", XS_utf8_upgrade, file); |
184 | newXS("utf8::downgrade", XS_utf8_downgrade, file); |
185 | newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file); |
186 | newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file); |
1b1f1335 |
187 | newXSproto("access::readonly",XS_access_readonly, file, "\\[$%@];$"); |
0cb96387 |
188 | } |
189 | |
55497cff |
190 | |
6d4a7be2 |
191 | XS(XS_UNIVERSAL_isa) |
192 | { |
193 | dXSARGS; |
55497cff |
194 | SV *sv; |
195 | char *name; |
2d8e6c8d |
196 | STRLEN n_a; |
6d4a7be2 |
197 | |
198 | if (items != 2) |
cea2e8a9 |
199 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
6d4a7be2 |
200 | |
201 | sv = ST(0); |
f8f70380 |
202 | |
d3f7f2b2 |
203 | if (SvGMAGICAL(sv)) |
204 | mg_get(sv); |
205 | |
aca069ec |
206 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
f8f70380 |
207 | XSRETURN_UNDEF; |
208 | |
2d8e6c8d |
209 | name = (char *)SvPV(ST(1),n_a); |
6d4a7be2 |
210 | |
54310121 |
211 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 |
212 | XSRETURN(1); |
213 | } |
214 | |
6d4a7be2 |
215 | XS(XS_UNIVERSAL_can) |
216 | { |
217 | dXSARGS; |
218 | SV *sv; |
219 | char *name; |
220 | SV *rv; |
6f08146e |
221 | HV *pkg = NULL; |
2d8e6c8d |
222 | STRLEN n_a; |
6d4a7be2 |
223 | |
224 | if (items != 2) |
cea2e8a9 |
225 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
6d4a7be2 |
226 | |
227 | sv = ST(0); |
f8f70380 |
228 | |
d3f7f2b2 |
229 | if (SvGMAGICAL(sv)) |
230 | mg_get(sv); |
231 | |
aca069ec |
232 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
f8f70380 |
233 | XSRETURN_UNDEF; |
234 | |
2d8e6c8d |
235 | name = (char *)SvPV(ST(1),n_a); |
3280af22 |
236 | rv = &PL_sv_undef; |
6d4a7be2 |
237 | |
46e4b22b |
238 | if (SvROK(sv)) { |
6f08146e |
239 | sv = (SV*)SvRV(sv); |
46e4b22b |
240 | if (SvOBJECT(sv)) |
6f08146e |
241 | pkg = SvSTASH(sv); |
242 | } |
243 | else { |
244 | pkg = gv_stashsv(sv, FALSE); |
245 | } |
246 | |
247 | if (pkg) { |
dc848c6f |
248 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
249 | if (gv && isGV(gv)) |
250 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); |
6d4a7be2 |
251 | } |
252 | |
253 | ST(0) = rv; |
254 | XSRETURN(1); |
255 | } |
256 | |
6d4a7be2 |
257 | XS(XS_UNIVERSAL_VERSION) |
258 | { |
259 | dXSARGS; |
260 | HV *pkg; |
261 | GV **gvp; |
262 | GV *gv; |
263 | SV *sv; |
264 | char *undef; |
265 | |
1571675a |
266 | if (SvROK(ST(0))) { |
6d4a7be2 |
267 | sv = (SV*)SvRV(ST(0)); |
1571675a |
268 | if (!SvOBJECT(sv)) |
cea2e8a9 |
269 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
6d4a7be2 |
270 | pkg = SvSTASH(sv); |
271 | } |
272 | else { |
273 | pkg = gv_stashsv(ST(0), FALSE); |
274 | } |
275 | |
276 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
277 | |
d4bea2fb |
278 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
6d4a7be2 |
279 | SV *nsv = sv_newmortal(); |
280 | sv_setsv(nsv, sv); |
281 | sv = nsv; |
282 | undef = Nullch; |
283 | } |
284 | else { |
3280af22 |
285 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 |
286 | undef = "(undef)"; |
287 | } |
288 | |
1571675a |
289 | if (items > 1) { |
290 | STRLEN len; |
291 | SV *req = ST(1); |
292 | |
293 | if (undef) |
294 | Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed", |
295 | HvNAME(pkg), HvNAME(pkg)); |
296 | |
297 | if (!SvNIOK(sv) && SvPOK(sv)) { |
298 | char *str = SvPVx(sv,len); |
299 | while (len) { |
300 | --len; |
301 | /* XXX could DWIM "1.2.3" here */ |
302 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') |
303 | break; |
304 | } |
305 | if (len) { |
4305d8ab |
306 | if (SvNOK(req) && SvPOK(req)) { |
1571675a |
307 | /* they said C<use Foo v1.2.3> and $Foo::VERSION |
308 | * doesn't look like a float: do string compare */ |
309 | if (sv_cmp(req,sv) == 1) { |
d2560b70 |
310 | Perl_croak(aTHX_ "%s v%"VDf" required--" |
311 | "this is only v%"VDf, |
1571675a |
312 | HvNAME(pkg), req, sv); |
313 | } |
314 | goto finish; |
315 | } |
316 | /* they said C<use Foo 1.002_003> and $Foo::VERSION |
317 | * doesn't look like a float: force numeric compare */ |
155aba94 |
318 | (void)SvUPGRADE(sv, SVt_PVNV); |
1571675a |
319 | SvNVX(sv) = str_to_version(sv); |
320 | SvPOK_off(sv); |
321 | SvNOK_on(sv); |
322 | } |
323 | } |
324 | /* if we get here, we're looking for a numeric comparison, |
325 | * so force the required version into a float, even if they |
326 | * said C<use Foo v1.2.3> */ |
4305d8ab |
327 | if (SvNOK(req) && SvPOK(req)) { |
1571675a |
328 | NV n = SvNV(req); |
329 | req = sv_newmortal(); |
330 | sv_setnv(req, n); |
331 | } |
332 | |
f6eb1a96 |
333 | if (SvNV(req) > SvNV(sv)) |
1571675a |
334 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
f6eb1a96 |
335 | HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv)); |
2d8e6c8d |
336 | } |
6d4a7be2 |
337 | |
1571675a |
338 | finish: |
6d4a7be2 |
339 | ST(0) = sv; |
340 | |
341 | XSRETURN(1); |
342 | } |
343 | |
1b026014 |
344 | XS(XS_utf8_valid) |
345 | { |
346 | dXSARGS; |
347 | if (items != 1) |
348 | Perl_croak(aTHX_ "Usage: utf8::valid(sv)"); |
349 | { |
350 | SV * sv = ST(0); |
351 | { |
352 | STRLEN len; |
353 | char *s = SvPV(sv,len); |
354 | if (!SvUTF8(sv) || is_utf8_string((U8*)s,len)) |
355 | XSRETURN_YES; |
356 | else |
357 | XSRETURN_NO; |
358 | } |
359 | } |
360 | XSRETURN_EMPTY; |
361 | } |
362 | |
363 | XS(XS_utf8_encode) |
364 | { |
365 | dXSARGS; |
366 | if (items != 1) |
367 | Perl_croak(aTHX_ "Usage: utf8::encode(sv)"); |
368 | { |
369 | SV * sv = ST(0); |
370 | |
371 | sv_utf8_encode(sv); |
372 | } |
373 | XSRETURN_EMPTY; |
374 | } |
375 | |
376 | XS(XS_utf8_decode) |
377 | { |
378 | dXSARGS; |
379 | if (items != 1) |
380 | Perl_croak(aTHX_ "Usage: utf8::decode(sv)"); |
381 | { |
382 | SV * sv = ST(0); |
383 | bool RETVAL; |
384 | |
385 | RETVAL = sv_utf8_decode(sv); |
386 | ST(0) = boolSV(RETVAL); |
387 | sv_2mortal(ST(0)); |
388 | } |
389 | XSRETURN(1); |
390 | } |
391 | |
392 | XS(XS_utf8_upgrade) |
393 | { |
394 | dXSARGS; |
395 | if (items != 1) |
396 | Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)"); |
397 | { |
398 | SV * sv = ST(0); |
399 | STRLEN RETVAL; |
400 | dXSTARG; |
401 | |
402 | RETVAL = sv_utf8_upgrade(sv); |
403 | XSprePUSH; PUSHi((IV)RETVAL); |
404 | } |
405 | XSRETURN(1); |
406 | } |
407 | |
408 | XS(XS_utf8_downgrade) |
409 | { |
410 | dXSARGS; |
411 | if (items < 1 || items > 2) |
412 | Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)"); |
413 | { |
414 | SV * sv = ST(0); |
415 | bool failok; |
416 | bool RETVAL; |
417 | |
418 | if (items < 2) |
419 | failok = 0; |
420 | else { |
421 | failok = (int)SvIV(ST(1)); |
422 | } |
423 | |
424 | RETVAL = sv_utf8_downgrade(sv, failok); |
425 | ST(0) = boolSV(RETVAL); |
426 | sv_2mortal(ST(0)); |
427 | } |
428 | XSRETURN(1); |
429 | } |
430 | |
431 | XS(XS_utf8_native_to_unicode) |
432 | { |
433 | dXSARGS; |
434 | UV uv = SvUV(ST(0)); |
b7953727 |
435 | |
436 | if (items > 1) |
437 | Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)"); |
438 | |
1b026014 |
439 | ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv))); |
440 | XSRETURN(1); |
441 | } |
442 | |
443 | XS(XS_utf8_unicode_to_native) |
444 | { |
445 | dXSARGS; |
446 | UV uv = SvUV(ST(0)); |
b7953727 |
447 | |
448 | if (items > 1) |
449 | Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)"); |
450 | |
1b026014 |
451 | ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv))); |
452 | XSRETURN(1); |
453 | } |
454 | |
1b1f1335 |
455 | XS(XS_access_readonly) |
456 | { |
457 | dXSARGS; |
458 | SV *sv = SvRV(ST(0)); |
459 | IV old = SvREADONLY(sv); |
460 | if (items == 2) { |
461 | if (SvTRUE(ST(1))) { |
462 | SvREADONLY_on(sv); |
463 | } |
464 | else { |
465 | SvREADONLY_off(sv); |
466 | } |
467 | } |
468 | if (old) |
469 | XSRETURN_YES; |
470 | else |
471 | XSRETURN_NO; |
472 | } |
1b026014 |
473 | |