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[perl5.git] / universal.c
CommitLineData
6d4a7be2 1#include "EXTERN.h"
864dbfa3 2#define PERL_IN_UNIVERSAL_C
6d4a7be2 3#include "perl.h"
6d4a7be2
PP
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 10STATIC SV *
cea2e8a9 11S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
6d4a7be2
PP
12{
13 AV* av;
14 GV* gv;
15 GV** gvp;
16 HV* hv = Nullhv;
46e4b22b 17 SV* subgen = Nullsv;
6d4a7be2
PP
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
PP
24
25 if (level > 100)
46e4b22b
GS
26 Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
27 HvNAME(stash));
6d4a7be2
PP
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
PP
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
PP
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
PP
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
PP
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
PP
86 }
87 }
3280af22 88 (void)hv_store(hv,name,len,&PL_sv_no,0);
6d4a7be2
PP
89 }
90 }
91
e09f3e01 92 return boolSV(strEQ(name, "UNIVERSAL"));
6d4a7be2
PP
93}
94
954c1994
GS
95/*
96=for apidoc sv_derived_from
97
98Returns a boolean indicating whether the SV is derived from the specified
99class. This is the function that implements C<UNIVERSAL::isa>. It works
100for class names as well as for objects.
101
102=cut
103*/
104
55497cff 105bool
864dbfa3 106Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
55497cff 107{
55497cff
PP
108 char *type;
109 HV *stash;
46e4b22b 110
55497cff
PP
111 stash = Nullhv;
112 type = Nullch;
46e4b22b 113
55497cff
PP
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
PP
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
PP
129 ? TRUE
130 : FALSE ;
55497cff
PP
131}
132
1b026014
NIS
133#include "XSUB.h"
134
acfe0abc
GS
135void XS_UNIVERSAL_isa(pTHX_ CV *cv);
136void XS_UNIVERSAL_can(pTHX_ CV *cv);
137void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
1b026014
NIS
138XS(XS_utf8_valid);
139XS(XS_utf8_encode);
140XS(XS_utf8_decode);
141XS(XS_utf8_upgrade);
142XS(XS_utf8_downgrade);
143XS(XS_utf8_unicode_to_native);
144XS(XS_utf8_native_to_unicode);
1b1f1335 145XS(XS_access_readonly);
0cb96387
GS
146
147void
148Perl_boot_core_UNIVERSAL(pTHX)
149{
150 char *file = __FILE__;
151
152 newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
153 newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
154 newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
1b026014
NIS
155 newXS("utf8::valid", XS_utf8_valid, file);
156 newXS("utf8::encode", XS_utf8_encode, file);
157 newXS("utf8::decode", XS_utf8_decode, file);
158 newXS("utf8::upgrade", XS_utf8_upgrade, file);
159 newXS("utf8::downgrade", XS_utf8_downgrade, file);
160 newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
161 newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
1b1f1335 162 newXSproto("access::readonly",XS_access_readonly, file, "\\[$%@];$");
0cb96387
GS
163}
164
55497cff 165
6d4a7be2
PP
166XS(XS_UNIVERSAL_isa)
167{
168 dXSARGS;
55497cff
PP
169 SV *sv;
170 char *name;
2d8e6c8d 171 STRLEN n_a;
6d4a7be2
PP
172
173 if (items != 2)
cea2e8a9 174 Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
6d4a7be2
PP
175
176 sv = ST(0);
f8f70380 177
d3f7f2b2
GS
178 if (SvGMAGICAL(sv))
179 mg_get(sv);
180
aca069ec 181 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
f8f70380
GS
182 XSRETURN_UNDEF;
183
2d8e6c8d 184 name = (char *)SvPV(ST(1),n_a);
6d4a7be2 185
54310121 186 ST(0) = boolSV(sv_derived_from(sv, name));
6d4a7be2
PP
187 XSRETURN(1);
188}
189
6d4a7be2
PP
190XS(XS_UNIVERSAL_can)
191{
192 dXSARGS;
193 SV *sv;
194 char *name;
195 SV *rv;
6f08146e 196 HV *pkg = NULL;
2d8e6c8d 197 STRLEN n_a;
6d4a7be2
PP
198
199 if (items != 2)
cea2e8a9 200 Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
6d4a7be2
PP
201
202 sv = ST(0);
f8f70380 203
d3f7f2b2
GS
204 if (SvGMAGICAL(sv))
205 mg_get(sv);
206
aca069ec 207 if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
f8f70380
GS
208 XSRETURN_UNDEF;
209
2d8e6c8d 210 name = (char *)SvPV(ST(1),n_a);
3280af22 211 rv = &PL_sv_undef;
6d4a7be2 212
46e4b22b 213 if (SvROK(sv)) {
6f08146e 214 sv = (SV*)SvRV(sv);
46e4b22b 215 if (SvOBJECT(sv))
6f08146e
NIS
216 pkg = SvSTASH(sv);
217 }
218 else {
219 pkg = gv_stashsv(sv, FALSE);
220 }
221
222 if (pkg) {
dc848c6f
PP
223 GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
224 if (gv && isGV(gv))
225 rv = sv_2mortal(newRV((SV*)GvCV(gv)));
6d4a7be2
PP
226 }
227
228 ST(0) = rv;
229 XSRETURN(1);
230}
231
6d4a7be2
PP
232XS(XS_UNIVERSAL_VERSION)
233{
234 dXSARGS;
235 HV *pkg;
236 GV **gvp;
237 GV *gv;
238 SV *sv;
239 char *undef;
240
1571675a 241 if (SvROK(ST(0))) {
6d4a7be2 242 sv = (SV*)SvRV(ST(0));
1571675a 243 if (!SvOBJECT(sv))
cea2e8a9 244 Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
6d4a7be2
PP
245 pkg = SvSTASH(sv);
246 }
247 else {
248 pkg = gv_stashsv(ST(0), FALSE);
249 }
250
251 gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
252
d4bea2fb 253 if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
6d4a7be2
PP
254 SV *nsv = sv_newmortal();
255 sv_setsv(nsv, sv);
256 sv = nsv;
257 undef = Nullch;
258 }
259 else {
3280af22 260 sv = (SV*)&PL_sv_undef;
6d4a7be2
PP
261 undef = "(undef)";
262 }
263
1571675a
GS
264 if (items > 1) {
265 STRLEN len;
266 SV *req = ST(1);
267
268 if (undef)
269 Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
270 HvNAME(pkg), HvNAME(pkg));
271
272 if (!SvNIOK(sv) && SvPOK(sv)) {
273 char *str = SvPVx(sv,len);
274 while (len) {
275 --len;
276 /* XXX could DWIM "1.2.3" here */
277 if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
278 break;
279 }
280 if (len) {
4305d8ab 281 if (SvNOK(req) && SvPOK(req)) {
1571675a
GS
282 /* they said C<use Foo v1.2.3> and $Foo::VERSION
283 * doesn't look like a float: do string compare */
284 if (sv_cmp(req,sv) == 1) {
d2560b70
RB
285 Perl_croak(aTHX_ "%s v%"VDf" required--"
286 "this is only v%"VDf,
1571675a
GS
287 HvNAME(pkg), req, sv);
288 }
289 goto finish;
290 }
291 /* they said C<use Foo 1.002_003> and $Foo::VERSION
292 * doesn't look like a float: force numeric compare */
155aba94 293 (void)SvUPGRADE(sv, SVt_PVNV);
1571675a
GS
294 SvNVX(sv) = str_to_version(sv);
295 SvPOK_off(sv);
296 SvNOK_on(sv);
297 }
298 }
299 /* if we get here, we're looking for a numeric comparison,
300 * so force the required version into a float, even if they
301 * said C<use Foo v1.2.3> */
4305d8ab 302 if (SvNOK(req) && SvPOK(req)) {
1571675a
GS
303 NV n = SvNV(req);
304 req = sv_newmortal();
305 sv_setnv(req, n);
306 }
307
f6eb1a96 308 if (SvNV(req) > SvNV(sv))
1571675a 309 Perl_croak(aTHX_ "%s version %s required--this is only version %s",
f6eb1a96 310 HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv));
2d8e6c8d 311 }
6d4a7be2 312
1571675a 313finish:
6d4a7be2
PP
314 ST(0) = sv;
315
316 XSRETURN(1);
317}
318
1b026014
NIS
319XS(XS_utf8_valid)
320{
321 dXSARGS;
322 if (items != 1)
323 Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
324 {
325 SV * sv = ST(0);
326 {
327 STRLEN len;
328 char *s = SvPV(sv,len);
329 if (!SvUTF8(sv) || is_utf8_string((U8*)s,len))
330 XSRETURN_YES;
331 else
332 XSRETURN_NO;
333 }
334 }
335 XSRETURN_EMPTY;
336}
337
338XS(XS_utf8_encode)
339{
340 dXSARGS;
341 if (items != 1)
342 Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
343 {
344 SV * sv = ST(0);
345
346 sv_utf8_encode(sv);
347 }
348 XSRETURN_EMPTY;
349}
350
351XS(XS_utf8_decode)
352{
353 dXSARGS;
354 if (items != 1)
355 Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
356 {
357 SV * sv = ST(0);
358 bool RETVAL;
359
360 RETVAL = sv_utf8_decode(sv);
361 ST(0) = boolSV(RETVAL);
362 sv_2mortal(ST(0));
363 }
364 XSRETURN(1);
365}
366
367XS(XS_utf8_upgrade)
368{
369 dXSARGS;
370 if (items != 1)
371 Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
372 {
373 SV * sv = ST(0);
374 STRLEN RETVAL;
375 dXSTARG;
376
377 RETVAL = sv_utf8_upgrade(sv);
378 XSprePUSH; PUSHi((IV)RETVAL);
379 }
380 XSRETURN(1);
381}
382
383XS(XS_utf8_downgrade)
384{
385 dXSARGS;
386 if (items < 1 || items > 2)
387 Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
388 {
389 SV * sv = ST(0);
390 bool failok;
391 bool RETVAL;
392
393 if (items < 2)
394 failok = 0;
395 else {
396 failok = (int)SvIV(ST(1));
397 }
398
399 RETVAL = sv_utf8_downgrade(sv, failok);
400 ST(0) = boolSV(RETVAL);
401 sv_2mortal(ST(0));
402 }
403 XSRETURN(1);
404}
405
406XS(XS_utf8_native_to_unicode)
407{
408 dXSARGS;
409 UV uv = SvUV(ST(0));
b7953727
JH
410
411 if (items > 1)
412 Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");
413
1b026014
NIS
414 ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
415 XSRETURN(1);
416}
417
418XS(XS_utf8_unicode_to_native)
419{
420 dXSARGS;
421 UV uv = SvUV(ST(0));
b7953727
JH
422
423 if (items > 1)
424 Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");
425
1b026014
NIS
426 ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
427 XSRETURN(1);
428}
429
1b1f1335
NIS
430XS(XS_access_readonly)
431{
432 dXSARGS;
433 SV *sv = SvRV(ST(0));
434 IV old = SvREADONLY(sv);
435 if (items == 2) {
436 if (SvTRUE(ST(1))) {
437 SvREADONLY_on(sv);
438 }
439 else {
440 SvREADONLY_off(sv);
441 }
442 }
443 if (old)
444 XSRETURN_YES;
445 else
446 XSRETURN_NO;
447}
1b026014 448