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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW
14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW
20 */
21
ccfc67b7
JH
22/*
23=head1 GV Functions
166f8a29
DM
24
25A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
26It is a structure that holds a pointer to a scalar, an array, a hash etc,
27corresponding to $foo, @foo, %foo.
28
29GVs are usually found as values in stashes (symbol table hashes) where
30Perl stores its global variables.
31
32=cut
ccfc67b7
JH
33*/
34
79072805 35#include "EXTERN.h"
864dbfa3 36#define PERL_IN_GV_C
79072805 37#include "perl.h"
8261f8eb 38#include "overload.c"
4aaa4757 39#include "keywords.h"
79072805 40
f54cb97a
AL
41static const char S_autoload[] = "AUTOLOAD";
42static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 43
c69033f2 44GV *
d5713896 45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13be902c
FC
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
54 )
55 ) {
bb85b28a
NC
56 const char *what;
57 if (type == SVt_PVIO) {
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a
NC
63 "dirhandle" : "filehandle";
64 /* diag_listed_as: Bad symbol for filehandle */
65 } else if (type == SVt_PVHV) {
66 what = "hash";
67 } else {
68 what = type == SVt_PVAV ? "array" : "scalar";
69 }
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896
NC
72
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
bb85b28a
NC
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
d5713896
NC
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
d5713896
NC
83 if (!*where)
84 *where = newSV_type(type);
79072805
LW
85 return gv;
86}
87
88GV *
864dbfa3 89Perl_gv_fetchfile(pTHX_ const char *name)
79072805 90{
7918f24d 91 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
92 return gv_fetchfile_flags(name, strlen(name), 0);
93}
94
95GV *
96Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
97 const U32 flags)
98{
97aff369 99 dVAR;
4116122e 100 char smallbuf[128];
53d95988 101 char *tmpbuf;
d9095cec 102 const STRLEN tmplen = namelen + 2;
79072805
LW
103 GV *gv;
104
7918f24d 105 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
106 PERL_UNUSED_ARG(flags);
107
1d7c1841 108 if (!PL_defstash)
a0714e2c 109 return NULL;
1d7c1841 110
d9095cec 111 if (tmplen <= sizeof smallbuf)
53d95988
CS
112 tmpbuf = smallbuf;
113 else
798b63bc 114 Newx(tmpbuf, tmplen, char);
0ac0412a 115 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
116 tmpbuf[0] = '_';
117 tmpbuf[1] = '<';
d9095cec
NC
118 memcpy(tmpbuf + 2, name, namelen);
119 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 120 if (!isGV(gv)) {
d9095cec 121 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 122#ifdef PERL_DONT_CREATE_GVSV
d9095cec 123 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 124#else
d9095cec 125 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 126#endif
1d7c1841 127 }
5a9a79a4
FC
128 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
129 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
53d95988
CS
130 if (tmpbuf != smallbuf)
131 Safefree(tmpbuf);
79072805
LW
132 return gv;
133}
134
62d55b22
NC
135/*
136=for apidoc gv_const_sv
137
138If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
139inlining, or C<gv> is a placeholder reference that would be promoted to such
140a typeglob, then returns the value returned by the sub. Otherwise, returns
141NULL.
142
143=cut
144*/
145
146SV *
147Perl_gv_const_sv(pTHX_ GV *gv)
148{
7918f24d
NC
149 PERL_ARGS_ASSERT_GV_CONST_SV;
150
62d55b22
NC
151 if (SvTYPE(gv) == SVt_PVGV)
152 return cv_const_sv(GvCVu(gv));
153 return SvROK(gv) ? SvRV(gv) : NULL;
154}
155
12816592
NC
156GP *
157Perl_newGP(pTHX_ GV *const gv)
158{
159 GP *gp;
19bad673
NC
160 U32 hash;
161#ifdef USE_ITHREADS
1df5f7c1
NC
162 const char *const file
163 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
19bad673
NC
164 const STRLEN len = strlen(file);
165#else
166 SV *const temp_sv = CopFILESV(PL_curcop);
167 const char *file;
168 STRLEN len;
169
7918f24d
NC
170 PERL_ARGS_ASSERT_NEWGP;
171
19bad673
NC
172 if (temp_sv) {
173 file = SvPVX(temp_sv);
174 len = SvCUR(temp_sv);
175 } else {
176 file = "";
177 len = 0;
178 }
179#endif
f4890806
NC
180
181 PERL_HASH(hash, file, len);
182
12816592
NC
183 Newxz(gp, 1, GP);
184
185#ifndef PERL_DONT_CREATE_GVSV
b5c2dcb8 186 gp->gp_sv = newSV(0);
12816592
NC
187#endif
188
1df5f7c1 189 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
12816592
NC
190 /* XXX Ideally this cast would be replaced with a change to const char*
191 in the struct. */
f4890806 192 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
193 gp->gp_egv = gv;
194 gp->gp_refcnt = 1;
195
196 return gp;
197}
198
803f2748
DM
199/* Assign CvGV(cv) = gv, handling weak references.
200 * See also S_anonymise_cv_maybe */
201
202void
203Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
204{
205 GV * const oldgv = CvGV(cv);
206 PERL_ARGS_ASSERT_CVGV_SET;
207
208 if (oldgv == gv)
209 return;
210
211 if (oldgv) {
cfc1e951 212 if (CvCVGV_RC(cv)) {
803f2748 213 SvREFCNT_dec(oldgv);
cfc1e951
DM
214 CvCVGV_RC_off(cv);
215 }
803f2748 216 else {
803f2748
DM
217 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
218 }
219 }
220
b3f91e91 221 SvANY(cv)->xcv_gv = gv;
c794ca97 222 assert(!CvCVGV_RC(cv));
803f2748
DM
223
224 if (!gv)
225 return;
226
c794ca97
DM
227 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
228 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
229 else {
cfc1e951 230 CvCVGV_RC_on(cv);
803f2748
DM
231 SvREFCNT_inc_simple_void_NN(gv);
232 }
803f2748
DM
233}
234
c68d9564
Z
235/* Assign CvSTASH(cv) = st, handling weak references. */
236
237void
238Perl_cvstash_set(pTHX_ CV *cv, HV *st)
239{
240 HV *oldst = CvSTASH(cv);
241 PERL_ARGS_ASSERT_CVSTASH_SET;
242 if (oldst == st)
243 return;
244 if (oldst)
245 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
246 SvANY(cv)->xcv_stash = st;
247 if (st)
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
249}
803f2748 250
e1104062
FC
251/*
252=for apidoc gv_init_pvn
253
254Converts a scalar into a typeglob. This is an incoercible typeglob;
255assigning a reference to it will assign to one of its slots, instead of
256overwriting it as happens with typeglobs created by SvSetSV. Converting
257any scalar that is SvOK() may produce unpredictable results and is reserved
258for perl's internal use.
259
260C<gv> is the scalar to be converted.
261
262C<stash> is the parent stash/package, if any.
263
04ec7e59
FC
264C<name> and C<len> give the name. The name must be unqualified;
265that is, it must not include the package name. If C<gv> is a
e1104062
FC
266stash element, it is the caller's responsibility to ensure that the name
267passed to this function matches the name of the element. If it does not
268match, perl's internal bookkeeping will get out of sync.
269
04ec7e59
FC
270C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
271the return value of SvUTF8(sv). It can also take the
272GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
273seen before (i.e., suppress "Used once" warnings).
274
275=for apidoc gv_init
276
277The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
278has no flags parameter. If the C<multi> parameter is set, the
279GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
280
281=for apidoc gv_init_pv
282
283Same as gv_init_pvn(), but takes a nul-terminated string for the name
284instead of separate char * and length parameters.
285
286=for apidoc gv_init_sv
287
288Same as gv_init_pvn(), but takes an SV * for the name instead of separate
289char * and length parameters. C<flags> is currently unused.
290
291=cut
292*/
293
463ee0b2 294void
04ec7e59 295Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
296{
297 char *namepv;
298 STRLEN namelen;
299 PERL_ARGS_ASSERT_GV_INIT_SV;
300 namepv = SvPV(namesv, namelen);
301 if (SvUTF8(namesv))
302 flags |= SVf_UTF8;
04ec7e59 303 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
304}
305
306void
04ec7e59 307Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
308{
309 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 310 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
311}
312
313void
04ec7e59 314Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 315{
27da23d5 316 dVAR;
3b6733bf
NC
317 const U32 old_type = SvTYPE(gv);
318 const bool doproto = old_type > SVt_NULL;
024963f8 319 char * const proto = (doproto && SvPOK(gv)) ? SvPVX(gv) : NULL;
49a54bbe 320 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 321 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 322 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 323 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 324
e6066781 325 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
326 assert (!(proto && has_constant));
327
328 if (has_constant) {
5c1f4d79
NC
329 /* The constant has to be a simple scalar type. */
330 switch (SvTYPE(has_constant)) {
331 case SVt_PVAV:
332 case SVt_PVHV:
333 case SVt_PVCV:
334 case SVt_PVFM:
335 case SVt_PVIO:
336 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
337 sv_reftype(has_constant, 0));
42d0e0b7 338 default: NOOP;
5c1f4d79 339 }
756cb477
NC
340 SvRV_set(gv, NULL);
341 SvROK_off(gv);
342 }
463ee0b2 343
3b6733bf
NC
344
345 if (old_type < SVt_PVGV) {
346 if (old_type >= SVt_PV)
347 SvCUR_set(gv, 0);
ad64d0ec 348 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 349 }
55d729e4
GS
350 if (SvLEN(gv)) {
351 if (proto) {
f880fe2f 352 SvPV_set(gv, NULL);
b162af07 353 SvLEN_set(gv, 0);
55d729e4
GS
354 SvPOK_off(gv);
355 } else
94010e71 356 Safefree(SvPVX_mutable(gv));
55d729e4 357 }
2e5b91de
NC
358 SvIOK_off(gv);
359 isGV_with_GP_on(gv);
12816592 360
c43ae56f 361 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
362 GvSTASH(gv) = stash;
363 if (stash)
ad64d0ec 364 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 365 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
366 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
367 GvMULTI_on(gv); /* _was_ mentioned */
55d729e4 368 if (doproto) { /* Replicate part of newSUB here. */
e3d2b9e7 369 CV *cv;
55d729e4 370 ENTER;
756cb477 371 if (has_constant) {
e5c69c9b
DM
372 char *name0 = NULL;
373 if (name[len])
374 /* newCONSTSUB doesn't take a len arg, so make sure we
375 * give it a \0-terminated string */
376 name0 = savepvn(name,len);
377
756cb477 378 /* newCONSTSUB takes ownership of the reference from us. */
c5540e1c 379 cv = newCONSTSUB_flags(stash, (name0 ? name0 : name), flags, has_constant);
75bd28cf
FC
380 /* In case op.c:S_process_special_blocks stole it: */
381 if (!GvCV(gv))
c43ae56f 382 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 383 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
e5c69c9b
DM
384 if (name0)
385 Safefree(name0);
1ccdb730
NC
386 /* If this reference was a copy of another, then the subroutine
387 must have been "imported", by a Perl space assignment to a GV
388 from a reference to CV. */
389 if (exported_constant)
390 GvIMPORTED_CV_on(gv);
756cb477 391 } else {
756cb477 392 (void) start_subparse(0,0); /* Create empty CV in compcv. */
e3d2b9e7 393 cv = PL_compcv;
c43ae56f 394 GvCV_set(gv,cv);
756cb477 395 }
55d729e4
GS
396 LEAVE;
397
e1a479c5 398 mro_method_changed_in(GvSTASH(gv)); /* sub Foo::bar($) { (shift) } sub ASDF::baz($); *ASDF::baz = \&Foo::bar */
b3f91e91 399 CvGV_set(cv, gv);
e3d2b9e7 400 CvFILE_set_from_cop(cv, PL_curcop);
c68d9564 401 CvSTASH_set(cv, PL_curstash);
55d729e4 402 if (proto) {
e3d2b9e7 403 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 404 SV_HAS_TRAILING_NUL);
e0260a5b 405 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
406 }
407 }
463ee0b2
LW
408}
409
76e3520e 410STATIC void
e6066781 411S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 412{
e6066781 413 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 414
a0d0e21e
LW
415 switch (sv_type) {
416 case SVt_PVIO:
417 (void)GvIOn(gv);
418 break;
419 case SVt_PVAV:
420 (void)GvAVn(gv);
421 break;
422 case SVt_PVHV:
423 (void)GvHVn(gv);
424 break;
c69033f2
NC
425#ifdef PERL_DONT_CREATE_GVSV
426 case SVt_NULL:
427 case SVt_PVCV:
428 case SVt_PVFM:
e654831b 429 case SVt_PVGV:
c69033f2
NC
430 break;
431 default:
dbdce04c
NC
432 if(GvSVn(gv)) {
433 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
434 If we just cast GvSVn(gv) to void, it ignores evaluating it for
435 its side effect */
436 }
c69033f2 437#endif
a0d0e21e
LW
438 }
439}
440
0f8d4b5e
FC
441static void core_xsub(pTHX_ CV* cv);
442
443static GV *
444S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
445 const char * const name, const STRLEN len,
446 const char * const fullname, STRLEN const fullen)
447{
448 const int code = keyword(name, len, 1);
449 static const char file[] = __FILE__;
450 CV *cv, *oldcompcv;
451 int opnum = 0;
452 SV *opnumsv;
453 bool ampable = TRUE; /* &{}-able */
454 COP *oldcurcop;
455 yy_parser *oldparser;
456 I32 oldsavestack_ix;
457
458 assert(gv || stash);
459 assert(name);
460 assert(stash || fullname);
461
462 if (!fullname && !HvENAME(stash)) return NULL; /* pathological case
463 that would require
464 inlining newATTRSUB */
465 if (code >= 0) return NULL; /* not overridable */
466 switch (-code) {
467 /* no support for \&CORE::infix;
468 no support for funcs that take labels, as their parsing is
469 weird */
470 case KEY_and: case KEY_cmp: case KEY_CORE: case KEY_dump:
471 case KEY_eq: case KEY_ge:
472 case KEY_gt: case KEY_le: case KEY_lt: case KEY_ne:
473 case KEY_or: case KEY_x: case KEY_xor:
474 return NULL;
475 case KEY_chdir:
476 case KEY_chomp: case KEY_chop:
477 case KEY_each: case KEY_eof: case KEY_exec:
478 case KEY_keys:
479 case KEY_lstat:
480 case KEY_pop:
481 case KEY_push:
482 case KEY_shift:
483 case KEY_splice:
484 case KEY_stat:
485 case KEY_system:
486 case KEY_truncate: case KEY_unlink:
487 case KEY_unshift:
488 case KEY_values:
489 ampable = FALSE;
490 }
491 if (!gv) {
492 gv = (GV *)newSV(0);
493 gv_init(gv, stash, name, len, TRUE);
494 }
495 if (ampable) {
496 ENTER;
497 oldcurcop = PL_curcop;
498 oldparser = PL_parser;
499 lex_start(NULL, NULL, 0);
500 oldcompcv = PL_compcv;
501 PL_compcv = NULL; /* Prevent start_subparse from setting
502 CvOUTSIDE. */
503 oldsavestack_ix = start_subparse(FALSE,0);
504 cv = PL_compcv;
505 }
506 else {
507 /* Avoid calling newXS, as it calls us, and things start to
508 get hairy. */
509 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
510 GvCV_set(gv,cv);
511 GvCVGEN(gv) = 0;
512 mro_method_changed_in(GvSTASH(gv));
513 CvISXSUB_on(cv);
514 CvXSUB(cv) = core_xsub;
515 }
516 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
517 from PL_curcop. */
518 (void)gv_fetchfile(file);
519 CvFILE(cv) = (char *)file;
520 /* XXX This is inefficient, as doing things this order causes
521 a prototype check in newATTRSUB. But we have to do
522 it this order as we need an op number before calling
523 new ATTRSUB. */
524 (void)core_prototype((SV *)cv, name, code, &opnum);
73c02f15
FC
525 if (stash && (fullname || !fullen))
526 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e
FC
527 if (ampable) {
528 SV *tmpstr;
529 CvLVALUE_on(cv);
530 if (!fullname) {
531 tmpstr = newSVhek(HvENAME_HEK(stash));
532 sv_catpvs(tmpstr, "::");
533 sv_catpvn(tmpstr,name,len);
534 }
535 else tmpstr = newSVpvn_share(fullname,fullen,0);
536 newATTRSUB(oldsavestack_ix,
537 newSVOP(OP_CONST, 0, tmpstr),
538 NULL,NULL,
539 coresub_op(
540 opnum
541 ? newSVuv((UV)opnum)
542 : newSVpvn(name,len),
543 code, opnum
544 )
545 );
546 assert(GvCV(gv) == cv);
547 if (opnum != OP_VEC && opnum != OP_SUBSTR)
548 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
549 LEAVE;
550 PL_parser = oldparser;
551 PL_curcop = oldcurcop;
552 PL_compcv = oldcompcv;
553 }
554 opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
555 cv_set_call_checker(
556 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
557 );
558 SvREFCNT_dec(opnumsv);
559 return gv;
560}
561
954c1994 562/*
6c53d59b
FC
563=for apidoc gv_fetchmeth
564
565Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
566
e6919483
BF
567=for apidoc gv_fetchmeth_sv
568
569Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
570of an SV instead of a string/length pair.
571
572=cut
573*/
574
575GV *
576Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
577{
578 char *namepv;
579 STRLEN namelen;
580 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
581 namepv = SvPV(namesv, namelen);
582 if (SvUTF8(namesv))
583 flags |= SVf_UTF8;
584 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
585}
586
587/*
588=for apidoc gv_fetchmeth_pv
589
590Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
591instead of a string/length pair.
592
593=cut
594*/
595
596GV *
597Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
598{
599 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
600 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
601}
602
603/*
604=for apidoc gv_fetchmeth_pvn
954c1994
GS
605
606Returns the glob with the given C<name> and a defined subroutine or
607C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 608accessible via @ISA and UNIVERSAL::.
954c1994
GS
609
610The argument C<level> should be either 0 or -1. If C<level==0>, as a
611side-effect creates a glob with the given C<name> in the given C<stash>
612which in the case of success contains an alias for the subroutine, and sets
e1a479c5 613up caching info for this glob.
954c1994 614
e6919483
BF
615Currently, the only significant value for C<flags> is SVf_UTF8.
616
954c1994
GS
617This function grants C<"SUPER"> token as a postfix of the stash name. The
618GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 619visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 620the GV directly; instead, you should use the method's CV, which can be
b267980d 621obtained from the GV with the C<GvCV> macro.
954c1994
GS
622
623=cut
624*/
625
e1a479c5
BB
626/* NOTE: No support for tied ISA */
627
79072805 628GV *
e6919483 629Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 630{
97aff369 631 dVAR;
463ee0b2 632 GV** gvp;
e1a479c5
BB
633 AV* linear_av;
634 SV** linear_svp;
635 SV* linear_sv;
636 HV* cstash;
637 GV* candidate = NULL;
638 CV* cand_cv = NULL;
e1a479c5 639 GV* topgv = NULL;
bfcb3514 640 const char *hvname;
e1a479c5
BB
641 I32 create = (level >= 0) ? 1 : 0;
642 I32 items;
643 STRLEN packlen;
644 U32 topgen_cmp;
04f3bf56 645 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 646
e6919483 647 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 648
af09ea45
IK
649 /* UNIVERSAL methods should be callable without a stash */
650 if (!stash) {
e1a479c5 651 create = 0; /* probably appropriate */
da51bb9b 652 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
653 return 0;
654 }
655
e1a479c5
BB
656 assert(stash);
657
bfcb3514
NC
658 hvname = HvNAME_get(stash);
659 if (!hvname)
e1a479c5 660 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 661
e1a479c5
BB
662 assert(hvname);
663 assert(name);
463ee0b2 664
bfcb3514 665 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
44a8e56a 666
dd69841b 667 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5
BB
668
669 /* check locally for a real method or a cache entry */
c60dbbc3 670 gvp = (GV**)hv_fetch(stash, name, is_utf8 ? -(I32)len : (I32)len, create);
e1a479c5
BB
671 if(gvp) {
672 topgv = *gvp;
0f8d4b5e 673 have_gv:
e1a479c5
BB
674 assert(topgv);
675 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 676 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
677 if ((cand_cv = GvCV(topgv))) {
678 /* If genuine method or valid cache entry, use it */
679 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
680 return topgv;
681 }
682 else {
683 /* stale cache entry, junk it and move on */
684 SvREFCNT_dec(cand_cv);
c43ae56f
DM
685 GvCV_set(topgv, NULL);
686 cand_cv = NULL;
e1a479c5
BB
687 GvCVGEN(topgv) = 0;
688 }
689 }
690 else if (GvCVGEN(topgv) == topgen_cmp) {
691 /* cache indicates no such method definitively */
692 return 0;
693 }
0f8d4b5e
FC
694 else if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
695 && strnEQ(hvname, "CORE", 4)
73c02f15 696 && S_maybe_add_coresub(aTHX_ stash,topgv,name,len,0,1))
0f8d4b5e 697 goto have_gv;
463ee0b2 698 }
79072805 699
e1a479c5
BB
700 packlen = HvNAMELEN_get(stash);
701 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
702 HV* basestash;
703 packlen -= 7;
772d5078
BF
704 basestash = gv_stashpvn(hvname, packlen,
705 GV_ADD | (HvNAMEUTF8(stash) ? SVf_UTF8 : 0));
e1a479c5 706 linear_av = mro_get_linear_isa(basestash);
9607fc9c 707 }
e1a479c5
BB
708 else {
709 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
79072805 710 }
a0d0e21e 711
e1a479c5
BB
712 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
713 items = AvFILLp(linear_av); /* no +1, to skip over self */
714 while (items--) {
715 linear_sv = *linear_svp++;
716 assert(linear_sv);
717 cstash = gv_stashsv(linear_sv, 0);
718
dd69841b 719 if (!cstash) {
ecad31f0
BF
720 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
721 "Can't locate package %"SVf" for @%"SVf"::ISA",
722 SVfARG(linear_sv),
723 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))));
e1a479c5
BB
724 continue;
725 }
9607fc9c 726
e1a479c5
BB
727 assert(cstash);
728
c60dbbc3 729 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
730 if (!gvp) {
731 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
732 const char *hvname = HvNAME(cstash); assert(hvname);
733 if (strnEQ(hvname, "CORE", 4)
734 && (candidate =
735 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len,0,0)
736 ))
737 goto have_candidate;
738 }
739 continue;
740 }
741 else candidate = *gvp;
742 have_candidate:
e1a479c5 743 assert(candidate);
04f3bf56 744 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 745 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
746 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
747 /*
748 * Found real method, cache method in topgv if:
749 * 1. topgv has no synonyms (else inheritance crosses wires)
750 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
751 */
752 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
753 CV *old_cv = GvCV(topgv);
754 SvREFCNT_dec(old_cv);
e1a479c5 755 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 756 GvCV_set(topgv, cand_cv);
e1a479c5
BB
757 GvCVGEN(topgv) = topgen_cmp;
758 }
759 return candidate;
760 }
761 }
9607fc9c 762
e1a479c5
BB
763 /* Check UNIVERSAL without caching */
764 if(level == 0 || level == -1) {
e6919483 765 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags);
e1a479c5
BB
766 if(candidate) {
767 cand_cv = GvCV(candidate);
768 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
769 CV *old_cv = GvCV(topgv);
770 SvREFCNT_dec(old_cv);
e1a479c5 771 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 772 GvCV_set(topgv, cand_cv);
e1a479c5
BB
773 GvCVGEN(topgv) = topgen_cmp;
774 }
775 return candidate;
776 }
777 }
778
779 if (topgv && GvREFCNT(topgv) == 1) {
780 /* cache the fact that the method is not defined */
781 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
782 }
783
79072805
LW
784 return 0;
785}
786
954c1994 787/*
460e5730
FC
788=for apidoc gv_fetchmeth_autoload
789
790This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
791parameter.
792
d21989ed 793=for apidoc gv_fetchmeth_sv_autoload
611c1e95 794
d21989ed
BF
795Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
796of an SV instead of a string/length pair.
797
798=cut
799*/
800
801GV *
802Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
803{
804 char *namepv;
805 STRLEN namelen;
806 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
807 namepv = SvPV(namesv, namelen);
808 if (SvUTF8(namesv))
809 flags |= SVf_UTF8;
810 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
811}
812
813/*
814=for apidoc gv_fetchmeth_pv_autoload
815
816Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
817instead of a string/length pair.
818
819=cut
820*/
821
822GV *
823Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
824{
825 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
826 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
827}
828
829/*
830=for apidoc gv_fetchmeth_pvn_autoload
831
832Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ
833Returns a glob for the subroutine.
834
835For an autoloaded subroutine without a GV, will create a GV even
836if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
837of the result may be zero.
838
d21989ed
BF
839Currently, the only significant value for C<flags> is SVf_UTF8.
840
611c1e95
IZ
841=cut
842*/
843
844GV *
d21989ed 845Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 846{
499321d3 847 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 848
d21989ed 849 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 850
611c1e95 851 if (!gv) {
611c1e95
IZ
852 CV *cv;
853 GV **gvp;
854
855 if (!stash)
6136c704 856 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 857 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 858 return NULL;
d21989ed 859 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 860 return NULL;
611c1e95
IZ
861 cv = GvCV(gv);
862 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 863 return NULL;
611c1e95
IZ
864 /* Have an autoload */
865 if (level < 0) /* Cannot do without a stub */
d21989ed 866 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
867 gvp = (GV**)hv_fetch(stash, name,
868 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 869 if (!gvp)
6136c704 870 return NULL;
611c1e95
IZ
871 return *gvp;
872 }
873 return gv;
874}
875
876/*
954c1994
GS
877=for apidoc gv_fetchmethod_autoload
878
879Returns the glob which contains the subroutine to call to invoke the method
880on the C<stash>. In fact in the presence of autoloading this may be the
881glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 882already setup.
954c1994
GS
883
884The third parameter of C<gv_fetchmethod_autoload> determines whether
885AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 886means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 887Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 888with a non-zero C<autoload> parameter.
954c1994
GS
889
890These functions grant C<"SUPER"> token as a prefix of the method name. Note
891that if you want to keep the returned glob for a long time, you need to
892check for it being "AUTOLOAD", since at the later time the call may load a
893different subroutine due to $AUTOLOAD changing its value. Use the glob
b267980d 894created via a side effect to do this.
954c1994
GS
895
896These functions have the same side-effects and as C<gv_fetchmeth> with
897C<level==0>. C<name> should be writable if contains C<':'> or C<'
898''>. The warning against passing the GV returned by C<gv_fetchmeth> to
b267980d 899C<call_sv> apply equally to these functions.
954c1994
GS
900
901=cut
902*/
903
7d3b1f61 904STATIC HV*
9cc50d5b 905S_gv_get_super_pkg(pTHX_ const char* name, I32 namelen, U32 flags)
7d3b1f61
BB
906{
907 AV* superisa;
908 GV** gvp;
909 GV* gv;
910 HV* stash;
911
7918f24d
NC
912 PERL_ARGS_ASSERT_GV_GET_SUPER_PKG;
913
f8e7a8bc 914 stash = gv_stashpvn(name, namelen, flags);
7d3b1f61
BB
915 if(stash) return stash;
916
917 /* If we must create it, give it an @ISA array containing
918 the real package this SUPER is for, so that it's tied
919 into the cache invalidation code correctly */
f8e7a8bc 920 stash = gv_stashpvn(name, namelen, GV_ADD | flags);
7d3b1f61
BB
921 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
922 gv = *gvp;
f8e7a8bc 923 gv_init(gv, stash, "ISA", 3, TRUE);
7d3b1f61
BB
924 superisa = GvAVn(gv);
925 GvMULTI_on(gv);
ad64d0ec 926 sv_magic(MUTABLE_SV(superisa), MUTABLE_SV(gv), PERL_MAGIC_isa, NULL, 0);
8e3a4a30 927#ifdef USE_ITHREADS
f8e7a8bc
BF
928 av_push(superisa, newSVpvn_flags(CopSTASHPV(PL_curcop),
929 strlen(CopSTASHPV(PL_curcop)),
930 CopSTASH_flags(PL_curcop)
931 ));
8e3a4a30
NC
932#else
933 av_push(superisa, newSVhek(CopSTASH(PL_curcop)
934 ? HvNAME_HEK(CopSTASH(PL_curcop)) : NULL));
935#endif
7d3b1f61
BB
936
937 return stash;
938}
939
dc848c6f 940GV *
864dbfa3 941Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 942{
547bb267
NC
943 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
944
256d1bb2
NC
945 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
946}
947
44130a26
BF
948GV *
949Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
950{
951 char *namepv;
952 STRLEN namelen;
953 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
954 namepv = SvPV(namesv, namelen);
955 if (SvUTF8(namesv))
956 flags |= SVf_UTF8;
957 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
958}
959
960GV *
961Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
962{
963 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
964 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
965}
966
256d1bb2
NC
967/* Don't merge this yet, as it's likely to get a len parameter, and possibly
968 even a U32 hash */
969GV *
44130a26 970Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 971{
97aff369 972 dVAR;
08105a92 973 register const char *nend;
c445ea15 974 const char *nsplit = NULL;
a0d0e21e 975 GV* gv;
0dae17bd 976 HV* ostash = stash;
c94593d0 977 const char * const origname = name;
ad64d0ec 978 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
979 const U32 autoload = flags & GV_AUTOLOAD;
980 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 981 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 982
44130a26 983 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 984
eff494dd 985 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 986 stash = NULL;
c9bf4021
NC
987 else {
988 /* The only way stash can become NULL later on is if nsplit is set,
989 which in turn means that there is no need for a SVt_PVHV case
990 the error reporting code. */
991 }
b267980d 992
44130a26 993 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 994 if (*nend == '\'') {
a0d0e21e 995 nsplit = nend;
c94593d0
NC
996 name = nend + 1;
997 }
998 else if (*nend == ':' && *(nend + 1) == ':') {
999 nsplit = nend++;
1000 name = nend + 1;
1001 }
a0d0e21e
LW
1002 }
1003 if (nsplit) {
7edbdc6b 1004 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1005 /* ->SUPER::method should really be looked up in original stash */
14d1dfbd
BF
1006 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%"SVf"::SUPER",
1007 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK((HV*)CopSTASH(PL_curcop)))))));
af09ea45 1008 /* __PACKAGE__::SUPER stash should be autovivified */
9cc50d5b 1009 stash = gv_get_super_pkg(SvPVX_const(tmpstr), SvCUR(tmpstr), SvUTF8(tmpstr));
cea2e8a9 1010 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
bfcb3514 1011 origname, HvNAME_get(stash), name) );
4633a7c4 1012 }
e189a56d 1013 else {
af09ea45 1014 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1015 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d
IK
1016
1017 /* however, explicit calls to Pkg::SUPER::method may
1018 happen, and may require autovivification to work */
1019 if (!stash && (nsplit - origname) >= 7 &&
1020 strnEQ(nsplit - 7, "::SUPER", 7) &&
14d1dfbd 1021 gv_stashpvn(origname, nsplit - origname - 7, is_utf8))
9cc50d5b 1022 stash = gv_get_super_pkg(origname, nsplit - origname, flags);
e189a56d 1023 }
0dae17bd 1024 ostash = stash;
4633a7c4
LW
1025 }
1026
14d1dfbd 1027 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1028 if (!gv) {
2f6e0fe7 1029 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1030 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1031 else if (autoload)
c8416c26
BF
1032 gv = gv_autoload_pvn(
1033 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1034 );
256d1bb2
NC
1035 if (!gv && do_croak) {
1036 /* Right now this is exclusively for the benefit of S_method_common
1037 in pp_hot.c */
1038 if (stash) {
15e6cdd9
DG
1039 /* If we can't find an IO::File method, it might be a call on
1040 * a filehandle. If IO:File has not been loaded, try to
1041 * require it first instead of croaking */
1042 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1043 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1044 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1045 STR_WITH_LEN("IO/File.pm"), 0,
1046 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1047 ) {
31b05a0f 1048 require_pv("IO/File.pm");
14d1dfbd 1049 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1050 if (gv)
1051 return gv;
1052 }
256d1bb2 1053 Perl_croak(aTHX_
f937af42
BF
1054 "Can't locate object method \"%"SVf"\" via package \"%"SVf"\"",
1055 SVfARG(newSVpvn_flags(name, nend - name,
1056 SVs_TEMP | is_utf8)),
1057 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))));
256d1bb2
NC
1058 }
1059 else {
ecad31f0 1060 SV* packnamesv;
256d1bb2 1061
256d1bb2 1062 if (nsplit) {
ecad31f0
BF
1063 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1064 SVs_TEMP | is_utf8);
256d1bb2 1065 } else {
ecad31f0 1066 packnamesv = sv_2mortal(newSVsv(error_report));
256d1bb2
NC
1067 }
1068
1069 Perl_croak(aTHX_
ecad31f0
BF
1070 "Can't locate object method \"%"SVf"\" via package \"%"SVf"\""
1071 " (perhaps you forgot to load \"%"SVf"\"?)",
1072 SVfARG(newSVpvn_flags(name, nend - name,
1073 SVs_TEMP | is_utf8)),
1074 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1075 }
1076 }
463ee0b2 1077 }
dc848c6f 1078 else if (autoload) {
9d4ba2ae 1079 CV* const cv = GvCV(gv);
09280a33
CS
1080 if (!CvROOT(cv) && !CvXSUB(cv)) {
1081 GV* stubgv;
1082 GV* autogv;
1083
1084 if (CvANON(cv))
1085 stubgv = gv;
1086 else {
1087 stubgv = CvGV(cv);
1088 if (GvCV(stubgv) != cv) /* orphaned import */
1089 stubgv = gv;
1090 }
c8416c26
BF
1091 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1092 GvNAME(stubgv), GvNAMELEN(stubgv),
1093 GV_AUTOLOAD_ISMETHOD
1094 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1095 if (autogv)
1096 gv = autogv;
1097 }
1098 }
44a8e56a
PP
1099
1100 return gv;
1101}
1102
1103GV*
0eeb01b9 1104Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1105{
1106 char *namepv;
1107 STRLEN namelen;
0fe84f7c 1108 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1109 namepv = SvPV(namesv, namelen);
1110 if (SvUTF8(namesv))
1111 flags |= SVf_UTF8;
0eeb01b9 1112 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1113}
1114
1115GV*
0eeb01b9 1116Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1117{
0fe84f7c 1118 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1119 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1120}
1121
1122GV*
0eeb01b9 1123Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1124{
27da23d5 1125 dVAR;
44a8e56a
PP
1126 GV* gv;
1127 CV* cv;
1128 HV* varstash;
1129 GV* vargv;
1130 SV* varsv;
c8416c26
BF
1131 SV *packname = NULL;
1132 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1133
0fe84f7c 1134 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1135
7edbdc6b 1136 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1137 return NULL;
0dae17bd
GS
1138 if (stash) {
1139 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1140 STRLEN packname_len = 0;
1141 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1142 packname = newSVpvn_flags(packname_ptr, packname_len,
1143 SVs_TEMP | SvUTF8(stash));
5c284bb0 1144 stash = NULL;
0dae17bd 1145 }
c8416c26
BF
1146 else
1147 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
0dae17bd 1148 }
c8416c26 1149 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
a0714e2c 1150 return NULL;
dc848c6f
PP
1151 cv = GvCV(gv);
1152
adb5a9ae 1153 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1154 return NULL;
ed850460 1155
dc848c6f
PP
1156 /*
1157 * Inheriting AUTOLOAD for non-methods works ... for now.
1158 */
0eeb01b9
FC
1159 if (
1160 !(flags & GV_AUTOLOAD_ISMETHOD)
1161 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1162 )
d1d15184 1163 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
ecad31f0
BF
1164 "Use of inherited AUTOLOAD for non-method %"SVf"::%"SVf"() is deprecated",
1165 SVfARG(packname),
1166 SVfARG(newSVpvn_flags(name, len, SVs_TEMP | is_utf8)));
44a8e56a 1167
aed2304a 1168 if (CvISXSUB(cv)) {
adb5a9ae
DM
1169 /* rather than lookup/init $AUTOLOAD here
1170 * only to have the XSUB do another lookup for $AUTOLOAD
1171 * and split that value on the last '::',
1172 * pass along the same data via some unused fields in the CV
1173 */
c68d9564 1174 CvSTASH_set(cv, stash);
f880fe2f 1175 SvPV_set(cv, (char *)name); /* cast to lose constness warning */
b162af07 1176 SvCUR_set(cv, len);
c8416c26
BF
1177 if (is_utf8)
1178 SvUTF8_on(cv);
adb5a9ae
DM
1179 return gv;
1180 }
adb5a9ae 1181
44a8e56a
PP
1182 /*
1183 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1184 * The subroutine's original name may not be "AUTOLOAD", so we don't
1185 * use that, but for lack of anything better we will use the sub's
1186 * original package to look up $AUTOLOAD.
1187 */
1188 varstash = GvSTASH(CvGV(cv));
5c7983e5 1189 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1190 ENTER;
1191
c69033f2 1192 if (!isGV(vargv)) {
04ec7e59 1193 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1194#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1195 GvSV(vargv) = newSV(0);
c69033f2
NC
1196#endif
1197 }
3d35f11b 1198 LEAVE;
e203899d 1199 varsv = GvSVn(vargv);
c8416c26 1200 sv_setsv(varsv, packname);
396482e1 1201 sv_catpvs(varsv, "::");
d40bf27b
NC
1202 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1203 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
1204 sv_catpvn_mg(varsv, name, len);
c8416c26
BF
1205 if (is_utf8)
1206 SvUTF8_on(varsv);
a0d0e21e
LW
1207 return gv;
1208}
1209
44a2ac75
YO
1210
1211/* require_tie_mod() internal routine for requiring a module
486ec47a 1212 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1213 *
1214 * The "gv" parameter should be the glob.
45cbc99a
RGS
1215 * "varpv" holds the name of the var, used for error messages.
1216 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1217 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1218 * are working reasonably close to as expected.
1219 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1220 * For the protection of $! to work (it is set by this routine)
1221 * the sv slot must already be magicalized.
d2c93421 1222 */
44a2ac75
YO
1223STATIC HV*
1224S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1225{
27da23d5 1226 dVAR;
da51bb9b 1227 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1228
7918f24d
NC
1229 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1230
44a2ac75 1231 if (!stash || !(gv_fetchmethod(stash, methpv))) {
45cbc99a
RGS
1232 SV *module = newSVsv(namesv);
1233 char varname = *varpv; /* varpv might be clobbered by load_module,
1234 so save it. For the moment it's always
1235 a single char. */
d2c93421 1236 dSP;
d2c93421 1237 ENTER;
44a2ac75 1238 if ( flags & 1 )
45cbc99a 1239 save_scalar(gv);
cac54379 1240 PUSHSTACKi(PERLSI_MAGIC);
45cbc99a 1241 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
cac54379 1242 POPSTACK;
d2c93421
RH
1243 LEAVE;
1244 SPAGAIN;
da51bb9b 1245 stash = gv_stashsv(namesv, 0);
44a2ac75 1246 if (!stash)
45cbc99a
RGS
1247 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available",
1248 varname, SVfARG(namesv));
1249 else if (!gv_fetchmethod(stash, methpv))
1250 Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s",
1251 varname, SVfARG(namesv), methpv);
d2c93421 1252 }
45cbc99a 1253 SvREFCNT_dec(namesv);
44a2ac75 1254 return stash;
d2c93421
RH
1255}
1256
954c1994
GS
1257/*
1258=for apidoc gv_stashpv
1259
da51bb9b 1260Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1261determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1262
1263=cut
1264*/
1265
a0d0e21e 1266HV*
864dbfa3 1267Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1268{
7918f24d 1269 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1270 return gv_stashpvn(name, strlen(name), create);
1271}
1272
bc96cb06
SH
1273/*
1274=for apidoc gv_stashpvn
1275
da51bb9b
NC
1276Returns a pointer to the stash for a specified package. The C<namelen>
1277parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1278to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1279created if it does not already exist. If the package does not exist and
1280C<flags> is 0 (or any other setting that does not create packages) then NULL
1281is returned.
1282
bc96cb06
SH
1283
1284=cut
1285*/
1286
dc437b57 1287HV*
da51bb9b 1288Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1289{
0cea0058 1290 char smallbuf[128];
46fc3d4c 1291 char *tmpbuf;
a0d0e21e
LW
1292 HV *stash;
1293 GV *tmpgv;
add0ecde 1294 U32 tmplen = namelen + 2;
dc437b57 1295
7918f24d
NC
1296 PERL_ARGS_ASSERT_GV_STASHPVN;
1297
add0ecde 1298 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1299 tmpbuf = smallbuf;
1300 else
add0ecde
VP
1301 Newx(tmpbuf, tmplen, char);
1302 Copy(name, tmpbuf, namelen, char);
1303 tmpbuf[namelen] = ':';
1304 tmpbuf[namelen+1] = ':';
1305 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1306 if (tmpbuf != smallbuf)
1307 Safefree(tmpbuf);
a0d0e21e 1308 if (!tmpgv)
da51bb9b 1309 return NULL;
a0d0e21e 1310 stash = GvHV(tmpgv);
1f656fcf 1311 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1312 assert(stash);
1f656fcf 1313 if (!HvNAME_get(stash)) {
0be4d16f 1314 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1315
1316 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1317 /* If the containing stash has multiple effective
1318 names, see that this one gets them, too. */
1319 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1320 mro_package_moved(stash, NULL, tmpgv, 1);
1321 }
a0d0e21e 1322 return stash;
463ee0b2
LW
1323}
1324
954c1994
GS
1325/*
1326=for apidoc gv_stashsv
1327
da51bb9b 1328Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS
1329
1330=cut
1331*/
1332
a0d0e21e 1333HV*
da51bb9b 1334Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1335{
dc437b57 1336 STRLEN len;
9d4ba2ae 1337 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC
1338
1339 PERL_ARGS_ASSERT_GV_STASHSV;
1340
0be4d16f 1341 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW
1342}
1343
1344
463ee0b2 1345GV *
fe9845cc 1346Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1347 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1348 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1349}
1350
1351GV *
fe9845cc 1352Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1353 STRLEN len;
77cb3b01
FC
1354 const char * const nambeg =
1355 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1356 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1357 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1358}
1359
ad7cce9f 1360STATIC void
290a1700 1361S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1362{
1363 AV* av;
1364
1365 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1366
1367 av = GvAVn(gv);
1368 GvMULTI_on(gv);
1369 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1370 NULL, 0);
ad7cce9f
FR
1371}
1372
1373STATIC void
26469672 1374S_gv_magicalize_overload(pTHX_ GV *gv)
ad7cce9f
FR
1375{
1376 HV* hv;
1377
1378 PERL_ARGS_ASSERT_GV_MAGICALIZE_OVERLOAD;
1379
1380 hv = GvHVn(gv);
1381 GvMULTI_on(gv);
1382 hv_magic(hv, NULL, PERL_MAGIC_overload);
1383}
1384
7a5fd60d
NC
1385GV *
1386Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
fe9845cc 1387 const svtype sv_type)
79072805 1388{
97aff369 1389 dVAR;
08105a92 1390 register const char *name = nambeg;
c445ea15 1391 register GV *gv = NULL;
79072805 1392 GV**gvp;
79072805 1393 I32 len;
b3d904f3 1394 register const char *name_cursor;
c445ea15 1395 HV *stash = NULL;
add2581e 1396 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
e26df76a 1397 const I32 no_expand = flags & GV_NOEXPAND;
780a5241 1398 const I32 add = flags & ~GV_NOADD_MASK;
04f3bf56 1399 const U32 is_utf8 = flags & SVf_UTF8;
9da346da 1400 bool addmg = !!(flags & GV_ADDMG);
b3d904f3
NC
1401 const char *const name_end = nambeg + full_len;
1402 const char *const name_em1 = name_end - 1;
5e0caaeb 1403 U32 faking_it;
79072805 1404
7918f24d
NC
1405 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1406
fafc274c
NC
1407 if (flags & GV_NOTQUAL) {
1408 /* Caller promised that there is no stash, so we can skip the check. */
1409 len = full_len;
1410 goto no_stash;
1411 }
1412
ecad31f0 1413 if (full_len > 2 && *name == '*' && isIDFIRST_lazy_if(name + 1, is_utf8)) {
b208e10c 1414 /* accidental stringify on a GV? */
c07a80fd 1415 name++;
b208e10c 1416 }
c07a80fd 1417
b3d904f3 1418 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
46c0ec20
FC
1419 if (name_cursor < name_em1 &&
1420 ((*name_cursor == ':'
b3d904f3 1421 && name_cursor[1] == ':')
46c0ec20 1422 || *name_cursor == '\''))
463ee0b2 1423 {
463ee0b2 1424 if (!stash)
3280af22 1425 stash = PL_defstash;
dc437b57 1426 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1427 return NULL;
463ee0b2 1428
b3d904f3 1429 len = name_cursor - name;
088225fd 1430 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
3a5b580c
NC
1431 const char *key;
1432 if (*name_cursor == ':') {
1433 key = name;
e771aaa9
NC
1434 len += 2;
1435 } else {
3a5b580c 1436 char *tmpbuf;
2ae0db35 1437 Newx(tmpbuf, len+2, char);
e771aaa9
NC
1438 Copy(name, tmpbuf, len, char);
1439 tmpbuf[len++] = ':';
1440 tmpbuf[len++] = ':';
3a5b580c 1441 key = tmpbuf;
e771aaa9 1442 }
0be4d16f 1443 gvp = (GV**)hv_fetch(stash, key, is_utf8 ? -len : len, add);
a0714e2c 1444 gv = gvp ? *gvp : NULL;
159b6efe 1445 if (gv && gv != (const GV *)&PL_sv_undef) {
6fa846a0 1446 if (SvTYPE(gv) != SVt_PVGV)
04ec7e59 1447 gv_init_pvn(gv, stash, key, len, (add & GV_ADDMULTI)|is_utf8);
6fa846a0
GS
1448 else
1449 GvMULTI_on(gv);
1450 }
3a5b580c 1451 if (key != name)
b9d2ea5b 1452 Safefree(key);
159b6efe 1453 if (!gv || gv == (const GV *)&PL_sv_undef)
a0714e2c 1454 return NULL;
85e6fe83 1455
463ee0b2 1456 if (!(stash = GvHV(gv)))
298d6511 1457 {
99ee9762
FC
1458 stash = GvHV(gv) = newHV();
1459 if (!HvNAME_get(stash)) {
e058c50a
FC
1460 if (GvSTASH(gv) == PL_defstash && len == 6
1461 && strnEQ(name, "CORE", 4))
1462 hv_name_set(stash, "CORE", 4, 0);
1463 else
1464 hv_name_set(
0be4d16f 1465 stash, nambeg, name_cursor-nambeg, is_utf8
e058c50a 1466 );
99ee9762
FC
1467 /* If the containing stash has multiple effective
1468 names, see that this one gets them, too. */
1469 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1470 mro_package_moved(stash, NULL, gv, 1);
1471 }
298d6511 1472 }
99ee9762 1473 else if (!HvNAME_get(stash))
0be4d16f 1474 hv_name_set(stash, nambeg, name_cursor - nambeg, is_utf8);
463ee0b2
LW
1475 }
1476
b3d904f3
NC
1477 if (*name_cursor == ':')
1478 name_cursor++;
088225fd 1479 name = name_cursor+1;
ad6bfa9d 1480 if (name == name_end)
159b6efe
NC
1481 return gv
1482 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
79072805 1483 }
79072805 1484 }
b3d904f3 1485 len = name_cursor - name;
463ee0b2
LW
1486
1487 /* No stash in name, so see how we can default */
1488
1489 if (!stash) {
fafc274c 1490 no_stash:
8ccce9ae 1491 if (len && isIDFIRST_lazy(name)) {
9607fc9c
PP
1492 bool global = FALSE;
1493
8ccce9ae
NC
1494 switch (len) {
1495 case 1:
18ea00d7 1496 if (*name == '_')
9d116dd7 1497 global = TRUE;
18ea00d7 1498 break;
8ccce9ae
NC
1499 case 3:
1500 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1501 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1502 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
9d116dd7 1503 global = TRUE;
18ea00d7 1504 break;
8ccce9ae
NC
1505 case 4:
1506 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1507 && name[3] == 'V')
9d116dd7 1508 global = TRUE;
18ea00d7 1509 break;
8ccce9ae
NC
1510 case 5:
1511 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1512 && name[3] == 'I' && name[4] == 'N')
463ee0b2 1513 global = TRUE;
18ea00d7 1514 break;
8ccce9ae
NC
1515 case 6:
1516 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1517 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1518 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1519 global = TRUE;
1520 break;
1521 case 7:
1522 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1523 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1524 && name[6] == 'T')
18ea00d7
NC
1525 global = TRUE;
1526 break;
463ee0b2 1527 }
9607fc9c 1528
463ee0b2 1529 if (global)
3280af22 1530 stash = PL_defstash;
923e4eb5 1531 else if (IN_PERL_COMPILETIME) {
3280af22
NIS
1532 stash = PL_curstash;
1533 if (add && (PL_hints & HINT_STRICT_VARS) &&
748a9306
LW
1534 sv_type != SVt_PVCV &&
1535 sv_type != SVt_PVGV &&
4633a7c4 1536 sv_type != SVt_PVFM &&
c07a80fd 1537 sv_type != SVt_PVIO &&
70ec6265
NC
1538 !(len == 1 && sv_type == SVt_PV &&
1539 (*name == 'a' || *name == 'b')) )
748a9306 1540 {
0be4d16f 1541 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,0);
4633a7c4 1542 if (!gvp ||
159b6efe 1543 *gvp == (const GV *)&PL_sv_undef ||
a5f75d66
AD
1544 SvTYPE(*gvp) != SVt_PVGV)
1545 {
d4c19fe8 1546 stash = NULL;
a5f75d66 1547 }
155aba94
GS
1548 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1549 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1550 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
4633a7c4 1551 {
ecad31f0 1552 SV* namesv = newSVpvn_flags(name, len, SVs_TEMP | is_utf8);
fe13d51d 1553 /* diag_listed_as: Variable "%s" is not imported%s */
413ff9f6
FC
1554 Perl_ck_warner_d(
1555 aTHX_ packWARN(WARN_MISC),
ecad31f0 1556 "Variable \"%c%"SVf"\" is not imported",
4633a7c4
LW
1557 sv_type == SVt_PVAV ? '@' :
1558 sv_type == SVt_PVHV ? '%' : '$',
ecad31f0 1559 SVfARG(namesv));
8ebc5c01 1560 if (GvCVu(*gvp))
413ff9f6
FC
1561 Perl_ck_warner_d(
1562 aTHX_ packWARN(WARN_MISC),
ecad31f0 1563 "\t(Did you mean &%"SVf" instead?)\n", SVfARG(namesv)
413ff9f6 1564 );
d4c19fe8 1565 stash = NULL;
4633a7c4 1566 }
a0d0e21e 1567 }
85e6fe83 1568 }
463ee0b2 1569 else
1d7c1841 1570 stash = CopSTASH(PL_curcop);
463ee0b2
LW
1571 }
1572 else
3280af22 1573 stash = PL_defstash;
463ee0b2
LW
1574 }
1575
1576 /* By this point we should have a stash and a name */
1577
a0d0e21e 1578 if (!stash) {
5a844595 1579 if (add) {
9d4ba2ae 1580 SV * const err = Perl_mess(aTHX_
ecad31f0 1581 "Global symbol \"%s%"SVf"\" requires explicit package name",
5a844595
GS
1582 (sv_type == SVt_PV ? "$"
1583 : sv_type == SVt_PVAV ? "@"
1584 : sv_type == SVt_PVHV ? "%"
ecad31f0 1585 : ""), SVfARG(newSVpvn_flags(name, len, SVs_TEMP | is_utf8)));
e7f343b6 1586 GV *gv;
608b3986
AE
1587 if (USE_UTF8_IN_NAMES)
1588 SvUTF8_on(err);
1589 qerror(err);
76f68e9b 1590 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
e7f343b6
NC
1591 if(!gv) {
1592 /* symbol table under destruction */
1593 return NULL;
1594 }
1595 stash = GvHV(gv);
a0d0e21e 1596 }
d7aacf4e 1597 else
a0714e2c 1598 return NULL;
a0d0e21e
LW
1599 }
1600
1601 if (!SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1602 return NULL;
a0d0e21e 1603
0be4d16f 1604 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
23496c6e
FC
1605 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
1606 if (addmg) gv = (GV *)newSV(0);
1607 else return NULL;
1608 }
914ecc63
FC
1609 else gv = *gvp, addmg = 0;
1610 /* From this point on, addmg means gv has not been inserted in the
1611 symtab yet. */
1612
79072805 1613 if (SvTYPE(gv) == SVt_PVGV) {
a0d0e21e 1614 if (add) {
a5f75d66 1615 GvMULTI_on(gv);
e6066781 1616 gv_init_svtype(gv, sv_type);
ccdda9cb
NC
1617 if (len == 1 && stash == PL_defstash
1618 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) {
44a2ac75
YO
1619 if (*name == '!')
1620 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
45cbc99a 1621 else if (*name == '-' || *name == '+')
192b9cd1 1622 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
45cbc99a 1623 }
af16de9f
FC
1624 else if (len == 3 && sv_type == SVt_PVAV
1625 && strnEQ(name, "ISA", 3)
1626 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1627 gv_magicalize_isa(gv);
a0d0e21e 1628 }
79072805 1629 return gv;
add2581e 1630 } else if (no_init) {
23496c6e 1631 assert(!addmg);
55d729e4 1632 return gv;
e26df76a 1633 } else if (no_expand && SvROK(gv)) {
23496c6e 1634 assert(!addmg);
e26df76a 1635 return gv;
79072805 1636 }
93a17b20 1637
5e0caaeb
NC
1638 /* Adding a new symbol.
1639 Unless of course there was already something non-GV here, in which case
1640 we want to behave as if there was always a GV here, containing some sort
1641 of subroutine.
1642 Otherwise we run the risk of creating things like GvIO, which can cause
1643 subtle bugs. eg the one that tripped up SQL::Translator */
1644
1645 faking_it = SvOK(gv);
93a17b20 1646
9b387841 1647 if (add & GV_ADDWARN)
ecad31f0 1648 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %"SVf" unexpectedly",
f1c07be4 1649 SVfARG(newSVpvn_flags(nambeg, name_end-nambeg, SVs_TEMP | is_utf8 )));
04ec7e59 1650 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
93a17b20 1651
ecad31f0
BF
1652 if ( isIDFIRST_lazy_if(name, is_utf8)
1653 && ! (isLEXWARN_on ? ckWARN(WARN_ONCE) : (PL_dowarn & G_WARN_ON ) ) )
0453d815
PM
1654 GvMULTI_on(gv) ;
1655
93a17b20 1656 /* set up magic where warranted */
44428a46
FC
1657 if (stash != PL_defstash) { /* not the main stash */
1658 /* We only have to check for four names here: EXPORT, ISA, OVERLOAD
4aaa4757
FC
1659 and VERSION. All the others apply only to the main stash or to
1660 CORE (which is checked right after this). */
f4e68e82 1661 if (len > 2) {
b464bac0 1662 const char * const name2 = name + 1;
cc4c2da6 1663 switch (*name) {
cc4c2da6
NC
1664 case 'E':
1665 if (strnEQ(name2, "XPORT", 5))
1666 GvMULTI_on(gv);
1667 break;
1668 case 'I':
44428a46 1669 if (strEQ(name2, "SA"))
290a1700 1670 gv_magicalize_isa(gv);
cc4c2da6
NC
1671 break;
1672 case 'O':
44428a46 1673 if (strEQ(name2, "VERLOAD"))
ad7cce9f 1674 gv_magicalize_overload(gv);
cc4c2da6 1675 break;
44428a46
FC
1676 case 'V':
1677 if (strEQ(name2, "ERSION"))
1678 GvMULTI_on(gv);
1679 break;
4aaa4757
FC
1680 default:
1681 goto try_core;
1682 }
23496c6e 1683 goto add_magical_gv;
4aaa4757
FC
1684 }
1685 try_core:
1686 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1687 /* Avoid null warning: */
1688 const char * const stashname = HvNAME(stash); assert(stashname);
0f8d4b5e
FC
1689 if (strnEQ(stashname, "CORE", 4)
1690 && S_maybe_add_coresub(aTHX_
1691 addmg ? stash : 0, gv, name, len, nambeg, full_len
1692 ))
1693 addmg = 0;
44428a46
FC
1694 }
1695 }
1696 else if (len > 1) {
1697#ifndef EBCDIC
1698 if (*name > 'V' ) {
1699 NOOP;
1700 /* Nothing else to do.
1701 The compiler will probably turn the switch statement into a
1702 branch table. Make sure we avoid even that small overhead for
1703 the common case of lower case variable names. */
1704 } else
1705#endif
1706 {
1707 const char * const name2 = name + 1;
1708 switch (*name) {
1709 case 'A':
1710 if (strEQ(name2, "RGV")) {
1711 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1712 }
1713 else if (strEQ(name2, "RGVOUT")) {
1714 GvMULTI_on(gv);
1715 }
1716 break;
1717 case 'E':
1718 if (strnEQ(name2, "XPORT", 5))
1719 GvMULTI_on(gv);
1720 break;
1721 case 'I':
1722 if (strEQ(name2, "SA")) {
290a1700 1723 gv_magicalize_isa(gv);
44428a46
FC
1724 }
1725 break;
1726 case 'O':
1727 if (strEQ(name2, "VERLOAD")) {
ad7cce9f 1728 gv_magicalize_overload(gv);
44428a46
FC
1729 }
1730 break;
cc4c2da6
NC
1731 case 'S':
1732 if (strEQ(name2, "IG")) {
1733 HV *hv;
1734 I32 i;
d525a7b2
NC
1735 if (!PL_psig_name) {
1736 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1737 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1738 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1739 } else {
1740 /* I think that the only way to get here is to re-use an
1741 embedded perl interpreter, where the previous
1742 use didn't clean up fully because
1743 PL_perl_destruct_level was 0. I'm not sure that we
1744 "support" that, in that I suspect in that scenario
1745 there are sufficient other garbage values left in the
1746 interpreter structure that something else will crash
1747 before we get here. I suspect that this is one of
1748 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1749 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1750 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1751 }
1752 GvMULTI_on(gv);
1753 hv = GvHVn(gv);
a0714e2c 1754 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1755 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1756 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1757 if (init)
1758 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1759 }
1760 }
1761 break;
1762 case 'V':
1763 if (strEQ(name2, "ERSION"))
1764 GvMULTI_on(gv);
1765 break;
e5218da5
GA
1766 case '\003': /* $^CHILD_ERROR_NATIVE */
1767 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1768 goto magicalize;
1769 break;
cc4c2da6
NC
1770 case '\005': /* $^ENCODING */
1771 if (strEQ(name2, "NCODING"))
1772 goto magicalize;
1773 break;
9ebf26ad
FR
1774 case '\007': /* $^GLOBAL_PHASE */
1775 if (strEQ(name2, "LOBAL_PHASE"))
1776 goto ro_magicalize;
1777 break;
cde0cee5
YO
1778 case '\015': /* $^MATCH */
1779 if (strEQ(name2, "ATCH"))
2fdbfb4d 1780 goto magicalize;
cc4c2da6
NC
1781 case '\017': /* $^OPEN */
1782 if (strEQ(name2, "PEN"))
1783 goto magicalize;
1784 break;
cde0cee5
YO
1785 case '\020': /* $^PREMATCH $^POSTMATCH */
1786 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
9ebf26ad
FR
1787 goto magicalize;
1788 break;
cc4c2da6
NC
1789 case '\024': /* ${^TAINT} */
1790 if (strEQ(name2, "AINT"))
1791 goto ro_magicalize;
1792 break;
7cebcbc0 1793 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1794 if (strEQ(name2, "NICODE"))
cc4c2da6 1795 goto ro_magicalize;
a0288114 1796 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1797 goto ro_magicalize;
e07ea26a
NC
1798 if (strEQ(name2, "TF8CACHE"))
1799 goto magicalize;
cc4c2da6
NC
1800 break;
1801 case '\027': /* $^WARNING_BITS */
1802 if (strEQ(name2, "ARNING_BITS"))
1803 goto magicalize;
1804 break;
1805 case '1':
1806 case '2':
1807 case '3':
1808 case '4':
1809 case '5':
1810 case '6':
1811 case '7':
1812 case '8':
1813 case '9':
85e6fe83 1814 {
2fdbfb4d
AB
1815 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1816 this test */
1817 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC
1818 const char *end = name + len;
1819 while (--end > name) {
23496c6e 1820 if (!isDIGIT(*end)) goto add_magical_gv;
cc4c2da6 1821 }
2fdbfb4d 1822 goto magicalize;
1d7c1841 1823 }
dc437b57 1824 }
93a17b20 1825 }
392db708
NC
1826 } else {
1827 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1828 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1829 switch (*name) {
6361f656
AB
1830 case '&': /* $& */
1831 case '`': /* $` */
1832 case '\'': /* $' */
cc4c2da6
NC
1833 if (
1834 sv_type == SVt_PVAV ||
1835 sv_type == SVt_PVHV ||
1836 sv_type == SVt_PVCV ||
1837 sv_type == SVt_PVFM ||
1838 sv_type == SVt_PVIO
1839 ) { break; }
1840 PL_sawampersand = TRUE;
2fdbfb4d 1841 goto magicalize;
cc4c2da6 1842
6361f656 1843 case ':': /* $: */
c69033f2 1844 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
1845 goto magicalize;
1846
6361f656 1847 case '?': /* $? */
ff0cee69 1848#ifdef COMPLEX_STATUS
c69033f2 1849 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1850#endif
cc4c2da6 1851 goto magicalize;
ff0cee69 1852
6361f656 1853 case '!': /* $! */
67261566 1854 GvMULTI_on(gv);
44a2ac75 1855 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1856
ad64d0ec 1857 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1858
44a2ac75 1859 /* magicalization must be done before require_tie_mod is called */
67261566 1860 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
44a2ac75 1861 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
d2c93421 1862
6cef1e77 1863 break;
6361f656
AB
1864 case '-': /* $- */
1865 case '+': /* $+ */
44a2ac75
YO
1866 GvMULTI_on(gv); /* no used once warnings here */
1867 {
44a2ac75 1868 AV* const av = GvAVn(gv);
ad64d0ec 1869 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1870
ad64d0ec
NC
1871 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1872 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1873 if (avc)
44a2ac75 1874 SvREADONLY_on(GvSVn(gv));
44a2ac75 1875 SvREADONLY_on(av);
67261566
YO
1876
1877 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
192b9cd1 1878 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
67261566 1879
80305961 1880 break;
cc4c2da6 1881 }
6361f656
AB
1882 case '*': /* $* */
1883 case '#': /* $# */
9b387841
NC
1884 if (sv_type == SVt_PV)
1885 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1886 "$%c is no longer supported", *name);
8ae1fe26 1887 break;
6361f656 1888 case '|': /* $| */
c69033f2 1889 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
cc4c2da6
NC
1890 goto magicalize;
1891
b3ca2e83
NC
1892 case '\010': /* $^H */
1893 {
1894 HV *const hv = GvHVn(gv);
1895 hv_magic(hv, NULL, PERL_MAGIC_hints);
1896 }
1897 goto magicalize;
cc4c2da6 1898 case '\023': /* $^S */
2fdbfb4d
AB
1899 ro_magicalize:
1900 SvREADONLY_on(GvSVn(gv));
1901 /* FALL THROUGH */
6361f656
AB
1902 case '0': /* $0 */
1903 case '1': /* $1 */
1904 case '2': /* $2 */
1905 case '3': /* $3 */
1906 case '4': /* $4 */
1907 case '5': /* $5 */
1908 case '6': /* $6 */
1909 case '7': /* $7 */
1910 case '8': /* $8 */
1911 case '9': /* $9 */
1912 case '[': /* $[ */
1913 case '^': /* $^ */
1914 case '~': /* $~ */
1915 case '=': /* $= */
1916 case '%': /* $% */
1917 case '.': /* $. */
1918 case '(': /* $( */
1919 case ')': /* $) */
1920 case '<': /* $< */
1921 case '>': /* $> */
1922 case '\\': /* $\ */
1923 case '/': /* $/ */
9cdac2a2 1924 case '$': /* $$ */
cc4c2da6
NC
1925 case '\001': /* $^A */
1926 case '\003': /* $^C */
1927 case '\004': /* $^D */
1928 case '\005': /* $^E */
1929 case '\006': /* $^F */
cc4c2da6
NC
1930 case '\011': /* $^I, NOT \t in EBCDIC */
1931 case '\016': /* $^N */
1932 case '\017': /* $^O */
1933 case '\020': /* $^P */
1934 case '\024': /* $^T */
1935 case '\027': /* $^W */
1936 magicalize:
ad64d0ec 1937 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 1938 break;
e521374c 1939
cc4c2da6 1940 case '\014': /* $^L */
76f68e9b 1941 sv_setpvs(GvSVn(gv),"\f");
c69033f2 1942 PL_formfeed = GvSVn(gv);
463ee0b2 1943 break;
6361f656 1944 case ';': /* $; */
76f68e9b 1945 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 1946 break;
6361f656 1947 case ']': /* $] */
cc4c2da6 1948 {
3638bf15 1949 SV * const sv = GvSV(gv);
d7aa5382 1950 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 1951 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
1952 GvSV(gv) = vnumify(PL_patchlevel);
1953 SvREADONLY_on(GvSV(gv));
1954 SvREFCNT_dec(sv);
93a17b20
LW
1955 }
1956 break;
cc4c2da6
NC
1957 case '\026': /* $^V */
1958 {
3638bf15 1959 SV * const sv = GvSV(gv);
f9be5ac8
DM
1960 GvSV(gv) = new_version(PL_patchlevel);
1961 SvREADONLY_on(GvSV(gv));
1962 SvREFCNT_dec(sv);
16070b82
GS
1963 }
1964 break;
cc4c2da6 1965 }
79072805 1966 }
23496c6e
FC
1967 add_magical_gv:
1968 if (addmg) {
1969 if (GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv) || (
1970 GvSV(gv) && (SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv)))
1971 ))
0f43181e 1972 (void)hv_store(stash,name,len,(SV *)gv,0);
23496c6e
FC
1973 else SvREFCNT_dec(gv), gv = NULL;
1974 }
e6066781 1975 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 1976 return gv;
79072805
LW
1977}
1978
1979void
35a4481c 1980Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 1981{
04f3bf56 1982 SV *name;
35a4481c 1983 const HV * const hv = GvSTASH(gv);
7918f24d
NC
1984
1985 PERL_ARGS_ASSERT_GV_FULLNAME4;
1986
43693395 1987 if (!hv) {
0c34ef67 1988 SvOK_off(sv);
43693395
GS
1989 return;
1990 }
666ea192 1991 sv_setpv(sv, prefix ? prefix : "");
a0288114 1992
04f3bf56
BF
1993 name = HvNAME_get(hv)
1994 ? sv_2mortal(newSVhek(HvNAME_HEK(hv)))
1995 : newSVpvn_flags( "__ANON__", 8, SVs_TEMP );
a0288114 1996
04f3bf56
BF
1997 if (keepmain || strnNE(SvPV_nolen(name), "main", SvCUR(name))) {
1998 sv_catsv(sv,name);
396482e1 1999 sv_catpvs(sv,"::");
43693395 2000 }
04f3bf56 2001 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2002}
2003
2004void
35a4481c 2005Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2006{
099be4f1 2007 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2008
2009 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2010
46c461b5 2011 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2012}
2013
79072805 2014void
1146e912 2015Perl_gv_check(pTHX_ const HV *stash)
79072805 2016{
97aff369 2017 dVAR;
79072805 2018 register I32 i;
463ee0b2 2019
7918f24d
NC
2020 PERL_ARGS_ASSERT_GV_CHECK;
2021
8990e307
LW
2022 if (!HvARRAY(stash))
2023 return;
a0d0e21e 2024 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2025 const HE *entry;
dc437b57 2026 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
b7787f18
AL
2027 register GV *gv;
2028 HV *hv;
dc437b57 2029 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2030 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2031 {
19b6c847 2032 if (hv != PL_defstash && hv != stash)
a0d0e21e
LW
2033 gv_check(hv); /* nested package */
2034 }
ecad31f0
BF
2035 else if ( *HeKEY(entry) != '_'
2036 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2037 const char *file;
159b6efe 2038 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2039 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2040 continue;
1d7c1841 2041 file = GvFILE(gv);
1d7c1841
GS
2042 CopLINE_set(PL_curcop, GvLINE(gv));
2043#ifdef USE_ITHREADS
dd374669 2044 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1d7c1841 2045#else
9bde8eb0
NC
2046 CopFILEGV(PL_curcop)
2047 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1d7c1841 2048#endif
9014280d 2049 Perl_warner(aTHX_ packWARN(WARN_ONCE),
ecad31f0
BF
2050 "Name \"%"SVf"::%"SVf"\" used only once: possible typo",
2051 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))),
2052 SVfARG(sv_2mortal(newSVhek(GvNAME_HEK(gv)))));
463ee0b2 2053 }
79072805
LW
2054 }
2055 }
2056}
2057
2058GV *
9cc50d5b 2059Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2060{
97aff369 2061 dVAR;
9cc50d5b 2062 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
7918f24d 2063
9cc50d5b
BF
2064 return gv_fetchpv(Perl_form(aTHX_ "%"SVf"::_GEN_%ld",
2065 SVfARG(newSVpvn_flags(pack, strlen(pack),
2066 SVs_TEMP | flags)),
2067 (long)PL_gensym++),
2068 GV_ADD, SVt_PVGV);
79072805
LW
2069}
2070
2071/* hopefully this is only called on local symbol table entries */
2072
2073GP*
864dbfa3 2074Perl_gp_ref(pTHX_ GP *gp)
79072805 2075{
97aff369 2076 dVAR;
1d7c1841 2077 if (!gp)
d4c19fe8 2078 return NULL;
79072805 2079 gp->gp_refcnt++;
44a8e56a
PP
2080 if (gp->gp_cv) {
2081 if (gp->gp_cvgen) {
e1a479c5
BB
2082 /* If the GP they asked for a reference to contains
2083 a method cache entry, clear it first, so that we
2084 don't infect them with our cached entry */
44a8e56a 2085 SvREFCNT_dec(gp->gp_cv);
601f1833 2086 gp->gp_cv = NULL;
44a8e56a
PP
2087 gp->gp_cvgen = 0;
2088 }
44a8e56a 2089 }
79072805 2090 return gp;
79072805
LW
2091}
2092
2093void
864dbfa3 2094Perl_gp_free(pTHX_ GV *gv)
79072805 2095{
97aff369 2096 dVAR;
79072805 2097 GP* gp;
b0d55c99 2098 int attempts = 100;
79072805 2099
f7877b28 2100 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2101 return;
f248d071 2102 if (gp->gp_refcnt == 0) {
9b387841
NC
2103 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2104 "Attempt to free unreferenced glob pointers"
2105 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2106 return;
2107 }
748a9306
LW
2108 if (--gp->gp_refcnt > 0) {
2109 if (gp->gp_egv == gv)
2110 gp->gp_egv = 0;
c43ae56f 2111 GvGP_set(gv, NULL);
79072805 2112 return;
748a9306 2113 }
79072805 2114
b0d55c99
FC
2115 while (1) {
2116 /* Copy and null out all the glob slots, so destructors do not see
2117 freed SVs. */
2118 HEK * const file_hek = gp->gp_file_hek;
2119 SV * const sv = gp->gp_sv;
2120 AV * const av = gp->gp_av;
2121 HV * const hv = gp->gp_hv;
2122 IO * const io = gp->gp_io;
2123 CV * const cv = gp->gp_cv;
2124 CV * const form = gp->gp_form;
2125
2126 gp->gp_file_hek = NULL;
2127 gp->gp_sv = NULL;
2128 gp->gp_av = NULL;
2129 gp->gp_hv = NULL;
2130 gp->gp_io = NULL;
2131 gp->gp_cv = NULL;
2132 gp->gp_form = NULL;
2133
2134 if (file_hek)
2135 unshare_hek(file_hek);
2136
2137 SvREFCNT_dec(sv);
2138 SvREFCNT_dec(av);
2139 /* FIXME - another reference loop GV -> symtab -> GV ?
2140 Somehow gp->gp_hv can end up pointing at freed garbage. */
2141 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065
BF
2142 const HEK *hvname_hek = HvNAME_HEK(hv);
2143 if (PL_stashcache && hvname_hek)
2144 (void)hv_delete(PL_stashcache, HEK_KEY(hvname_hek),
2145 (HEK_UTF8(hvname_hek) ? -HEK_LEN(hvname_hek) : HEK_LEN(hvname_hek)),
2146 G_DISCARD);
b0d55c99
FC
2147 SvREFCNT_dec(hv);
2148 }
2149 SvREFCNT_dec(io);
2150 SvREFCNT_dec(cv);
2151 SvREFCNT_dec(form);
2152
2153 if (!gp->gp_file_hek
2154 && !gp->gp_sv
2155 && !gp->gp_av
2156 && !gp->gp_hv
2157 && !gp->gp_io
2158 && !gp->gp_cv
2159 && !gp->gp_form) break;
2160
2161 if (--attempts == 0) {
2162 Perl_die(aTHX_
2163 "panic: gp_free failed to free glob pointer - "
2164 "something is repeatedly re-creating entries"
2165 );
2166 }
13207a71 2167 }
748a9306 2168
79072805 2169 Safefree(gp);
c43ae56f 2170 GvGP_set(gv, NULL);
79072805
LW
2171}
2172
d460ef45
NIS
2173int
2174Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2175{
53c1dcc0
AL
2176 AMT * const amtp = (AMT*)mg->mg_ptr;
2177 PERL_UNUSED_ARG(sv);
dd374669 2178
7918f24d
NC
2179 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2180
d460ef45
NIS
2181 if (amtp && AMT_AMAGIC(amtp)) {
2182 int i;
2183 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2184 CV * const cv = amtp->table[i];
b37c2d43 2185 if (cv) {
ad64d0ec 2186 SvREFCNT_dec(MUTABLE_SV(cv));
601f1833 2187 amtp->table[i] = NULL;
d460ef45
NIS
2188 }
2189 }
2190 }
2191 return 0;
2192}
2193
a0d0e21e 2194/* Updates and caches the CV's */
c3a9a790
RGS
2195/* Returns:
2196 * 1 on success and there is some overload
2197 * 0 if there is no overload
2198 * -1 if some error occurred and it couldn't croak
2199 */
a0d0e21e 2200
c3a9a790 2201int
242f8760 2202Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2203{
97aff369 2204 dVAR;
ad64d0ec 2205 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2206 AMT amt;
9b439311 2207 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2208 U32 newgen;
a0d0e21e 2209
7918f24d
NC
2210 PERL_ARGS_ASSERT_GV_AMUPDATE;
2211
9b439311 2212 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2213 if (mg) {
2214 const AMT * const amtp = (AMT*)mg->mg_ptr;
2215 if (amtp->was_ok_am == PL_amagic_generation
e1a479c5 2216 && amtp->was_ok_sub == newgen) {
c3a9a790 2217 return AMT_OVERLOADED(amtp) ? 1 : 0;
14899595 2218 }
ad64d0ec 2219 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2220 }
a0d0e21e 2221
bfcb3514 2222 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2223
d460ef45 2224 Zero(&amt,1,AMT);
3280af22 2225 amt.was_ok_am = PL_amagic_generation;
e1a479c5 2226 amt.was_ok_sub = newgen;
a6006777
PP
2227 amt.fallback = AMGfallNO;
2228 amt.flags = 0;
2229
a6006777 2230 {
32251b26
IZ
2231 int filled = 0, have_ovl = 0;
2232 int i, lim = 1;
a6006777 2233
22c35a8c 2234 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2235
89ffc314 2236 /* Try to find via inheritance. */
e6919483 2237 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
53c1dcc0
AL
2238 SV * const sv = gv ? GvSV(gv) : NULL;
2239 CV* cv;
89ffc314
IZ
2240
2241 if (!gv)
32251b26 2242 lim = DESTROY_amg; /* Skip overloading entries. */
c69033f2
NC
2243#ifdef PERL_DONT_CREATE_GVSV
2244 else if (!sv) {
6f207bd3 2245 NOOP; /* Equivalent to !SvTRUE and !SvOK */
c69033f2
NC
2246 }
2247#endif
89ffc314
IZ
2248 else if (SvTRUE(sv))
2249 amt.fallback=AMGfallYES;
2250 else if (SvOK(sv))
2251 amt.fallback=AMGfallNEVER;
a6006777 2252
32251b26 2253 for (i = 1; i < lim; i++)
601f1833 2254 amt.table[i] = NULL;
32251b26 2255 for (; i < NofAMmeth; i++) {
6136c704 2256 const char * const cooky = PL_AMG_names[i];
32251b26 2257 /* Human-readable form, for debugging: */
6136c704 2258 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
d279ab82 2259 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2260
a0288114 2261 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2262 cp, HvNAME_get(stash)) );
611c1e95
IZ
2263 /* don't fill the cache while looking up!
2264 Creation of inheritance stubs in intermediate packages may
2265 conflict with the logic of runtime method substitution.
2266 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2267 then we could have created stubs for "(+0" in A and C too.
2268 But if B overloads "bool", we may want to use it for
2269 numifying instead of C's "+0". */
2270 if (i >= DESTROY_amg)
d21989ed 2271 gv = Perl_gv_fetchmeth_pvn_autoload(aTHX_ stash, cooky, l, 0, 0);
611c1e95 2272 else /* Autoload taken care of below */
e6919483 2273 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2274 cv = 0;
89ffc314 2275 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC
2276 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2277 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2278 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2279 && strEQ(hvname, "overload")) {
611c1e95
IZ
2280 /* This is a hack to support autoloading..., while
2281 knowing *which* methods were declared as overloaded. */
44a8e56a 2282 /* GvSV contains the name of the method. */
6136c704 2283 GV *ngv = NULL;
c69033f2 2284 SV *gvsv = GvSV(gv);
a0288114
AL
2285
2286 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2287 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2288 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2289 if (!gvsv || !SvPOK(gvsv)
7f415459 2290 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2291 {
a0288114 2292 /* Can be an import stub (created by "can"). */
242f8760 2293 if (destructing) {
c3a9a790 2294 return -1;
242f8760
RGS
2295 }
2296 else {
d66cca07
BF
2297 const SV * const name = (gvsv && SvPOK(gvsv))
2298 ? gvsv
2299 : newSVpvs_flags("???", SVs_TEMP);
2300 Perl_croak(aTHX_ "%s method \"%"SVf256
2301 "\" overloading \"%s\" "\
2302 "in package \"%"SVf256"\"",
242f8760
RGS
2303 (GvCVGEN(gv) ? "Stub found while resolving"
2304 : "Can't resolve"),
d66cca07
BF
2305 SVfARG(name), cp,
2306 SVfARG(sv_2mortal(newSVhek(
2307 HvNAME_HEK(stash)
2308 ))));
242f8760 2309 }
44a8e56a 2310 }
dc848c6f 2311 cv = GvCV(gv = ngv);
f0e9f182 2312 }
44a8e56a 2313 }
b464bac0 2314 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2315 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2316 GvNAME(CvGV(cv))) );
2317 filled = 1;
32251b26
IZ
2318 if (i < DESTROY_amg)
2319 have_ovl = 1;
611c1e95 2320 } else if (gv) { /* Autoloaded... */
ea726b52 2321 cv = MUTABLE_CV(gv);
611c1e95 2322 filled = 1;
44a8e56a 2323 }
ea726b52 2324 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
a0d0e21e 2325 }
a0d0e21e 2326 if (filled) {
a6006777 2327 AMT_AMAGIC_on(&amt);
32251b26
IZ
2328 if (have_ovl)
2329 AMT_OVERLOADED_on(&amt);
ad64d0ec 2330 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2331 (char*)&amt, sizeof(AMT));
32251b26 2332 return have_ovl;
a0d0e21e
LW
2333 }
2334 }
a6006777 2335 /* Here we have no table: */
9cbac4c7 2336 /* no_table: */
a6006777 2337 AMT_AMAGIC_off(&amt);
ad64d0ec 2338 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2339 (char*)&amt, sizeof(AMTS));
c3a9a790 2340 return 0;
a0d0e21e
LW
2341}
2342
32251b26
IZ
2343
2344CV*
2345Perl_gv_handler(pTHX_ HV *stash, I32 id)
2346{
97aff369 2347 dVAR;
3f8f4626 2348 MAGIC *mg;
32251b26 2349 AMT *amtp;
e1a479c5 2350 U32 newgen;
9b439311 2351 struct mro_meta* stash_meta;
32251b26 2352
bfcb3514 2353 if (!stash || !HvNAME_get(stash))
601f1833 2354 return NULL;
e1a479c5 2355
9b439311
BB
2356 stash_meta = HvMROMETA(stash);
2357 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2358
ad64d0ec 2359 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2360 if (!mg) {
2361 do_update:
242f8760
RGS
2362 /* If we're looking up a destructor to invoke, we must avoid
2363 * that Gv_AMupdate croaks, because we might be dying already */
2dcac756 2364 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
242f8760
RGS
2365 /* and if it didn't found a destructor, we fall back
2366 * to a simpler method that will only look for the
2367 * destructor instead of the whole magic */
2368 if (id == DESTROY_amg) {
2369 GV * const gv = gv_fetchmethod(stash, "DESTROY");
2370 if (gv)
2371 return GvCV(gv);
2372 }
2373 return NULL;
2374 }
ad64d0ec 2375 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2376 }
a9fd4e40 2377 assert(mg);
32251b26
IZ
2378 amtp = (AMT*)mg->mg_ptr;
2379 if ( amtp->was_ok_am != PL_amagic_generation
e1a479c5 2380 || amtp->was_ok_sub != newgen )
32251b26 2381 goto do_update;
3ad83ce7 2382 if (AMT_AMAGIC(amtp)) {
b7787f18 2383 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2384 if (ret && isGV(ret)) { /* Autoloading stab */
2385 /* Passing it through may have resulted in a warning
2386 "Inherited AUTOLOAD for a non-method deprecated", since
2387 our caller is going through a function call, not a method call.
2388 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2389 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2390
2391 if (gv && GvCV(gv))
2392 return GvCV(gv);
2393 }
2394 return ret;
2395 }
a0288114 2396
601f1833 2397 return NULL;
32251b26
IZ
2398}
2399
2400
6f1401dc
DM
2401/* Implement tryAMAGICun_MG macro.
2402 Do get magic, then see if the stack arg is overloaded and if so call it.
2403 Flags:
2404 AMGf_set return the arg using SETs rather than assigning to
2405 the targ
2406 AMGf_numeric apply sv_2num to the stack arg.
2407*/
2408
2409bool
2410Perl_try_amagic_un(pTHX_ int method, int flags) {
2411 dVAR;
2412 dSP;
2413 SV* tmpsv;
2414 SV* const arg = TOPs;
2415
2416 SvGETMAGIC(arg);
2417
9f8bf298
NC
2418 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2419 AMGf_noright | AMGf_unary))) {
6f1401dc
DM
2420 if (flags & AMGf_set) {
2421 SETs(tmpsv);
2422 }
2423 else {
2424 dTARGET;
2425 if (SvPADMY(TARG)) {
2426 sv_setsv(TARG, tmpsv);
2427 SETTARG;
2428 }
2429 else
2430 SETs(tmpsv);
2431 }
2432 PUTBACK;
2433 return TRUE;
2434 }
2435
2436 if ((flags & AMGf_numeric) && SvROK(arg))
2437 *sp = sv_2num(arg);
2438 return FALSE;
2439}
2440
2441
2442/* Implement tryAMAGICbin_MG macro.
2443 Do get magic, then see if the two stack args are overloaded and if so
2444 call it.
2445 Flags:
2446 AMGf_set return the arg using SETs rather than assigning to
2447 the targ
2448 AMGf_assign op may be called as mutator (eg +=)
2449 AMGf_numeric apply sv_2num to the stack arg.
2450*/
2451
2452bool
2453Perl_try_amagic_bin(pTHX_ int method, int flags) {
2454 dVAR;
2455 dSP;
2456 SV* const left = TOPm1s;
2457 SV* const right = TOPs;
2458
2459 SvGETMAGIC(left);
2460 if (left != right)
2461 SvGETMAGIC(right);
2462
2463 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2464 SV * const tmpsv = amagic_call(left, right, method,
2465 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2466 if (tmpsv) {
2467 if (flags & AMGf_set) {
2468 (void)POPs;
2469 SETs(tmpsv);
2470 }
2471 else {
2472 dATARGET;
2473 (void)POPs;
2474 if (opASSIGN || SvPADMY(TARG)) {
2475 sv_setsv(TARG, tmpsv);
2476 SETTARG;
2477 }
2478 else
2479 SETs(tmpsv);
2480 }
2481 PUTBACK;
2482 return TRUE;
2483 }
2484 }
75ea7a12
FC
2485 if(left==right && SvGMAGICAL(left)) {
2486 SV * const left = sv_newmortal();
2487 *(sp-1) = left;
2488 /* Print the uninitialized warning now, so it includes the vari-
2489 able name. */
2490 if (!SvOK(right)) {
2491 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2492 sv_setsv_flags(left, &PL_sv_no, 0);
2493 }
2494 else sv_setsv_flags(left, right, 0);
2495 SvGETMAGIC(right);
2496 }
6f1401dc 2497 if (flags & AMGf_numeric) {
75ea7a12
FC
2498 if (SvROK(TOPm1s))
2499 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2500 if (SvROK(right))
2501 *sp = sv_2num(right);
2502 }
2503 return FALSE;
2504}
2505
25a9ffce
NC
2506SV *
2507Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2508 SV *tmpsv = NULL;
2509
2510 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2511
2512 while (SvAMAGIC(ref) &&
2513 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2514 AMGf_noright | AMGf_unary))) {
2515 if (!SvROK(tmpsv))
2516 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2517 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2518 /* Bail out if it returns us the same reference. */
2519 return tmpsv;
2520 }
2521 ref = tmpsv;
2522 }
2523 return tmpsv ? tmpsv : ref;
2524}
6f1401dc 2525
a0d0e21e 2526SV*
864dbfa3 2527Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2528{
27da23d5 2529 dVAR;
b267980d 2530 MAGIC *mg;
9c5ffd7c 2531 CV *cv=NULL;
a0d0e21e 2532 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2533 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2534 int off = 0, off1, lr = 0, notfound = 0;
2535 int postpr = 0, force_cpy = 0;
2536 int assign = AMGf_assign & flags;
2537 const int assignshift = assign ? 1 : 0;
bf5522a1 2538 int use_default_op = 0;
497b47a8
JH
2539#ifdef DEBUGGING
2540 int fl=0;
497b47a8 2541#endif
25716404 2542 HV* stash=NULL;
7918f24d
NC
2543
2544 PERL_ARGS_ASSERT_AMAGIC_CALL;
2545
e46c382e 2546 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
20439bc7 2547 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
e46c382e
YK
2548
2549 if ( !lex_mask || !SvOK(lex_mask) )
2550 /* overloading lexically disabled */
2551 return NULL;
2552 else if ( lex_mask && SvPOK(lex_mask) ) {
2553 /* we have an entry in the hints hash, check if method has been
2554 * masked by overloading.pm */
d15cd831 2555 STRLEN len;
e46c382e 2556 const int offset = method / 8;
d87d3eed 2557 const int bit = method % 8;
e46c382e
YK
2558 char *pv = SvPV(lex_mask, len);
2559
d15cd831 2560 /* Bit set, so this overloading operator is disabled */
ed15e576 2561 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
e46c382e
YK
2562 return NULL;
2563 }
2564 }
2565
a0d0e21e 2566 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
25716404 2567 && (stash = SvSTASH(SvRV(left)))
ad64d0ec 2568 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2569 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2570 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2571 : NULL))
b267980d 2572 && ((cv = cvp[off=method+assignshift])
748a9306
LW
2573 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2574 * usual method */
497b47a8
JH
2575 (
2576#ifdef DEBUGGING
2577 fl = 1,
a0288114 2578#endif
497b47a8 2579 cv = cvp[off=method])))) {
a0d0e21e
LW
2580 lr = -1; /* Call method for left argument */
2581 } else {
2582 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2583 int logic;
2584
2585 /* look for substituted methods */
ee239bfe 2586 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
2587 switch (method) {
2588 case inc_amg:
ee239bfe
IZ
2589 force_cpy = 1;
2590 if ((cv = cvp[off=add_ass_amg])
2591 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2592 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2593 }
2594 break;
2595 case dec_amg:
ee239bfe
IZ
2596 force_cpy = 1;
2597 if ((cv = cvp[off = subtr_ass_amg])
2598 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2599 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2600 }
2601 break;
2602 case bool__amg:
2603 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2604 break;
2605 case numer_amg:
2606 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2607 break;
2608 case string_amg:
2609 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2610 break;
b7787f18
AL
2611 case not_amg:
2612 (void)((cv = cvp[off=bool__amg])
2613 || (cv = cvp[off=numer_amg])
2614 || (cv = cvp[off=string_amg]));
2ab54efd
MB
2615 if (cv)
2616 postpr = 1;
b7787f18 2617 break;
748a9306
LW
2618 case copy_amg:
2619 {
76e3520e
GS
2620 /*
2621 * SV* ref causes confusion with the interpreter variable of
2622 * the same name
2623 */
890ce7af 2624 SV* const tmpRef=SvRV(left);
76e3520e 2625 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
2626 /*
2627 * Just to be extra cautious. Maybe in some
2628 * additional cases sv_setsv is safe, too.
2629 */
890ce7af 2630 SV* const newref = newSVsv(tmpRef);
748a9306 2631 SvOBJECT_on(newref);
96d4b0ee
NC
2632 /* As a bit of a source compatibility hack, SvAMAGIC() and
2633 friends dereference an RV, to behave the same was as when
2634 overloading was stored on the reference, not the referant.
2635 Hence we can't use SvAMAGIC_on()
2636 */
2637 SvFLAGS(newref) |= SVf_AMAGIC;
85fbaab2 2638 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
2639 return newref;
2640 }
2641 }
2642 break;
a0d0e21e 2643 case abs_amg:
b267980d 2644 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2645 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2646 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2647 if (off1==lt_amg) {
890ce7af 2648 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2649 lt_amg,AMGf_noright);
2650 logic = SvTRUE(lessp);
2651 } else {
890ce7af 2652 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2653 ncmp_amg,AMGf_noright);
2654 logic = (SvNV(lessp) < 0);
2655 }
2656 if (logic) {
2657 if (off==subtr_amg) {
2658 right = left;
748a9306 2659 left = nullsv;
a0d0e21e
LW
2660 lr = 1;
2661 }
2662 } else {
2663 return left;
2664 }
2665 }
2666 break;
2667 case neg_amg:
155aba94 2668 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
2669 right = left;
2670 left = sv_2mortal(newSViv(0));
2671 lr = 1;
2672 }
2673 break;
f216259d 2674 case int_amg:
f5284f61 2675 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2676 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2677 case regexp_amg:
b267980d
NIS
2678 /* FAIL safe */
2679 return NULL; /* Delegate operation to standard mechanisms. */
2680 break;
f5284f61
IZ
2681 case to_sv_amg:
2682 case to_av_amg:
2683 case to_hv_amg:
2684 case to_gv_amg:
2685 case to_cv_amg:
2686 /* FAIL safe */
b267980d 2687 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2688 break;
a0d0e21e
LW
2689 default:
2690 goto not_found;
2691 }
2692 if (!cv) goto not_found;
2693 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
25716404 2694 && (stash = SvSTASH(SvRV(right)))
ad64d0ec 2695 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2696 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2697 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2698 : NULL))
a0d0e21e
LW
2699 && (cv = cvp[off=method])) { /* Method for right
2700 * argument found */
2701 lr=1;
bf5522a1
MB
2702 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2703 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
2704 && !(flags & AMGf_unary)) {
2705 /* We look for substitution for
2706 * comparison operations and
fc36a67e 2707 * concatenation */
a0d0e21e
LW
2708 if (method==concat_amg || method==concat_ass_amg
2709 || method==repeat_amg || method==repeat_ass_amg) {
2710 return NULL; /* Delegate operation to string conversion */
2711 }
2712 off = -1;
2713 switch (method) {
2714 case lt_amg:
2715 case le_amg:
2716 case gt_amg:
2717 case ge_amg:
2718 case eq_amg:
2719 case ne_amg:
2ab54efd
MB
2720 off = ncmp_amg;
2721 break;
a0d0e21e
LW
2722 case slt_amg:
2723 case sle_amg:
2724 case sgt_amg:
2725 case sge_amg:
2726 case seq_amg:
2727 case sne_amg:
2ab54efd
MB
2728 off = scmp_amg;
2729 break;
a0d0e21e 2730 }
bf5522a1
MB
2731 if (off != -1) {
2732 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2733 cv = ocvp[off];
2734 lr = -1;
2735 }
2736 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2737 cv = cvp[off];
2738 lr = 1;
2739 }
2740 }
2741 if (cv)
2ab54efd
MB
2742 postpr = 1;
2743 else
2744 goto not_found;
a0d0e21e 2745 } else {
a6006777 2746 not_found: /* No method found, either report or croak */
b267980d
NIS
2747 switch (method) {
2748 case to_sv_amg:
2749 case to_av_amg:
2750 case to_hv_amg:
2751 case to_gv_amg:
2752 case to_cv_amg:
2753 /* FAIL safe */
2754 return left; /* Delegate operation to standard mechanisms. */
2755 break;
2756 }
a0d0e21e
LW
2757 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2758 notfound = 1; lr = -1;
2759 } else if (cvp && (cv=cvp[nomethod_amg])) {
2760 notfound = 1; lr = 1;
bf5522a1
MB
2761 } else if ((use_default_op =
2762 (!ocvp || oamtp->fallback >= AMGfallYES)
2763 && (!cvp || amtp->fallback >= AMGfallYES))
2764 && !DEBUG_o_TEST) {
4cc0ca18
NC
2765 /* Skip generating the "no method found" message. */
2766 return NULL;
a0d0e21e 2767 } else {
46fc3d4c 2768 SV *msg;
774d564b 2769 if (off==-1) off=method;
b267980d 2770 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
2771 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
2772 AMG_id2name(method + assignshift),
2773 (flags & AMGf_unary ? " " : "\n\tleft "),
2774 SvAMAGIC(left)?
2775 "in overloaded package ":
2776 "has no overloaded magic",
2777 SvAMAGIC(left)?
2778 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
2779 SVfARG(&PL_sv_no),
2780 SvAMAGIC(right)?
2781 ",\n\tright argument in overloaded package ":
2782 (flags & AMGf_unary
2783 ? ""
2784 : ",\n\tright argument has no overloaded magic"),
2785 SvAMAGIC(right)?
2786 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
2787 SVfARG(&PL_sv_no)));
bf5522a1 2788 if (use_default_op) {
d66cca07 2789 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 2790 } else {
be2597df 2791 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
2792 }
2793 return NULL;
2794 }
ee239bfe 2795 force_cpy = force_cpy || assign;
a0d0e21e
LW
2796 }
2797 }
497b47a8 2798#ifdef DEBUGGING
a0d0e21e 2799 if (!notfound) {
497b47a8 2800 DEBUG_o(Perl_deb(aTHX_
d66cca07 2801 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
2802 AMG_id2name(off),
2803 method+assignshift==off? "" :
a0288114 2804 " (initially \"",
497b47a8
JH
2805 method+assignshift==off? "" :
2806 AMG_id2name(method+assignshift),
a0288114 2807 method+assignshift==off? "" : "\")",
497b47a8
JH
2808 flags & AMGf_unary? "" :
2809 lr==1 ? " for right argument": " for left argument",
2810 flags & AMGf_unary? " for argument" : "",
d66cca07 2811 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 2812 fl? ",\n\tassignment variant used": "") );
ee239bfe 2813 }
497b47a8 2814#endif
748a9306
LW
2815 /* Since we use shallow copy during assignment, we need
2816 * to dublicate the contents, probably calling user-supplied
2817 * version of copy operator
2818 */
ee239bfe
IZ
2819 /* We need to copy in following cases:
2820 * a) Assignment form was called.
2821 * assignshift==1, assign==T, method + 1 == off
2822 * b) Increment or decrement, called directly.
2823 * assignshift==0, assign==0, method + 0 == off
2824 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 2825 * assignshift==0, assign==T,
ee239bfe
IZ
2826 * force_cpy == T
2827 * d) Increment or decrement, translated to nomethod.
b267980d 2828 * assignshift==0, assign==0,
ee239bfe
IZ
2829 * force_cpy == T
2830 * e) Assignment form translated to nomethod.
2831 * assignshift==1, assign==T, method + 1 != off
2832 * force_cpy == T
2833 */
2834 /* off is method, method+assignshift, or a result of opcode substitution.
2835 * In the latter case assignshift==0, so only notfound case is important.
2836 */
2837 if (( (method + assignshift == off)
2838 && (assign || (method == inc_amg) || (method == dec_amg)))
2839 || force_cpy)
6f1401dc 2840 {
1b38c28e
NC
2841 /* newSVsv does not behave as advertised, so we copy missing
2842 * information by hand */
2843 SV *tmpRef = SvRV(left);
2844 SV *rv_copy;
31d632c3 2845 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
2846 SvRV_set(left, rv_copy);
2847 SvSETMAGIC(left);
2848 SvREFCNT_dec(tmpRef);
2849 }
6f1401dc
DM
2850 }
2851
a0d0e21e
LW
2852 {
2853 dSP;
2854 BINOP myop;
2855 SV* res;
b7787f18 2856 const bool oldcatch = CATCH_GET;
a0d0e21e 2857
54310121 2858 CATCH_SET(TRUE);
a0d0e21e
LW
2859 Zero(&myop, 1, BINOP);
2860 myop.op_last = (OP *) &myop;
b37c2d43 2861 myop.op_next = NULL;
54310121 2862 myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED;
a0d0e21e 2863
e788e7d3 2864 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 2865 ENTER;
462e5cf6 2866 SAVEOP();
533c011a 2867 PL_op = (OP *) &myop;
3280af22 2868 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 2869 PL_op->op_private |= OPpENTERSUB_DB;
a0d0e21e 2870 PUTBACK;
897d3989 2871 Perl_pp_pushmark(aTHX);
a0d0e21e 2872
924508f0 2873 EXTEND(SP, notfound + 5);
a0d0e21e
LW
2874 PUSHs(lr>0? right: left);
2875 PUSHs(lr>0? left: right);
3280af22 2876 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 2877 if (notfound) {
59cd0e26
NC
2878 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
2879 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 2880 }
ad64d0ec 2881 PUSHs(MUTABLE_SV(cv));
a0d0e21e
LW
2882 PUTBACK;
2883
139d0ce6 2884 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 2885 CALLRUNOPS(aTHX);
a0d0e21e
LW
2886 LEAVE;
2887 SPAGAIN;
2888
2889 res=POPs;
ebafeae7 2890 PUTBACK;
d3acc0f7 2891 POPSTACK;
54310121 2892 CATCH_SET(oldcatch);
a0d0e21e 2893
a0d0e21e 2894 if (postpr) {
b7787f18 2895 int ans;
a0d0e21e
LW
2896 switch (method) {
2897 case le_amg:
2898 case sle_amg:
2899 ans=SvIV(res)<=0; break;
2900 case lt_amg:
2901 case slt_amg:
2902 ans=SvIV(res)<0; break;
2903 case ge_amg:
2904 case sge_amg:
2905 ans=SvIV(res)>=0; break;
2906 case gt_amg:
2907 case sgt_amg:
2908 ans=SvIV(res)>0; break;
2909 case eq_amg:
2910 case seq_amg:
2911 ans=SvIV(res)==0; break;
2912 case ne_amg:
2913 case sne_amg:
2914 ans=SvIV(res)!=0; break;
2915 case inc_amg:
2916 case dec_amg:
bbce6d69 2917 SvSetSV(left,res); return left;
dc437b57 2918 case not_amg:
fe7ac86a 2919 ans=!SvTRUE(res); break;
b7787f18
AL
2920 default:
2921 ans=0; break;
a0d0e21e 2922 }
54310121 2923 return boolSV(ans);
748a9306
LW
2924 } else if (method==copy_amg) {
2925 if (!SvROK(res)) {
cea2e8a9 2926 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
2927 }
2928 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
2929 } else {
2930 return res;
2931 }
2932 }
2933}
c9d5ac95 2934
f5c1e807
NC
2935void
2936Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
2937{
2938 dVAR;
acda4c6a 2939 U32 hash;
f5c1e807 2940
7918f24d 2941 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 2942
acda4c6a
NC
2943 if (len > I32_MAX)
2944 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
2945
ae8cc45f
NC
2946 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
2947 unshare_hek(GvNAME_HEK(gv));
2948 }
2949
acda4c6a 2950 PERL_HASH(hash, name, len);
c60dbbc3 2951 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
2952}
2953
66610fdd 2954/*
f7461760
Z
2955=for apidoc gv_try_downgrade
2956
2867cdbc
Z
2957If the typeglob C<gv> can be expressed more succinctly, by having
2958something other than a real GV in its place in the stash, replace it
2959with the optimised form. Basic requirements for this are that C<gv>
2960is a real typeglob, is sufficiently ordinary, and is only referenced
2961from its package. This function is meant to be used when a GV has been
2962looked up in part to see what was there, causing upgrading, but based
2963on what was found it turns out that the real GV isn't required after all.
2964
2965If C<gv> is a completely empty typeglob, it is deleted from the stash.
2966
2967If C<gv> is a typeglob containing only a sufficiently-ordinary constant
2968sub, the typeglob is replaced with a scalar-reference placeholder that
2969more compactly represents the same thing.
f7461760
Z
2970
2971=cut
2972*/
2973
2974void
2975Perl_gv_try_downgrade(pTHX_ GV *gv)
2976{
2977 HV *stash;
2978 CV *cv;
2979 HEK *namehek;
2980 SV **gvp;
2981 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
2982
2983 /* XXX Why and where does this leave dangling pointers during global
2984 destruction? */
627364f1 2985 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 2986
2867cdbc 2987 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 2988 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 2989 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 2990 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 2991 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 2992 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 2993 return;
803f2748
DM
2994 if (SvMAGICAL(gv)) {
2995 MAGIC *mg;
2996 /* only backref magic is allowed */
2997 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
2998 return;
2999 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3000 if (mg->mg_type != PERL_MAGIC_backref)
3001 return;
3002 }
3003 }
2867cdbc
Z
3004 cv = GvCV(gv);
3005 if (!cv) {
3006 HEK *gvnhek = GvNAME_HEK(gv);
3007 (void)hv_delete(stash, HEK_KEY(gvnhek),
3008 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
3009 } else if (GvMULTI(gv) && cv &&
f7461760
Z
3010 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3011 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3012 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3013 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3014 (namehek = GvNAME_HEK(gv)) &&
3015 (gvp = hv_fetch(stash, HEK_KEY(namehek),
3016 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
3017 *gvp == (SV*)gv) {
3018 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
3019 SvREFCNT(gv) = 0;
3020 sv_clear((SV*)gv);
3021 SvREFCNT(gv) = 1;
3022 SvFLAGS(gv) = SVt_IV|SVf_ROK;
3023 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3024 STRUCT_OFFSET(XPVIV, xiv_iv));
3025 SvRV_set(gv, value);
3026 }
3027}
3028
4aaa4757
FC
3029#include "XSUB.h"
3030
3031static void
3032core_xsub(pTHX_ CV* cv)
3033{
3034 Perl_croak(aTHX_
3035 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3036 );
3037}
3038
f7461760 3039/*
66610fdd
RGS
3040 * Local variables:
3041 * c-indentation-style: bsd
3042 * c-basic-offset: 4
3043 * indent-tabs-mode: t
3044 * End:
3045 *
37442d52
RGS
3046 * ex: set ts=8 sts=4 sw=4 noet:
3047 */