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gv.c:newGP: merge some threaded and non-threaded code
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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"
2846acbf 40#include "feature.h"
79072805 41
f54cb97a
AL
42static const char S_autoload[] = "AUTOLOAD";
43static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 44
c69033f2 45GV *
d5713896 46Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 47{
d5713896 48 SV **where;
7918f24d 49
13be902c
FC
50 if (
51 !gv
52 || (
53 SvTYPE((const SV *)gv) != SVt_PVGV
54 && SvTYPE((const SV *)gv) != SVt_PVLV
55 )
56 ) {
bb85b28a
NC
57 const char *what;
58 if (type == SVt_PVIO) {
59 /*
60 * if it walks like a dirhandle, then let's assume that
61 * this is a dirhandle.
62 */
332c2eac 63 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 64 "dirhandle" : "filehandle";
bb85b28a
NC
65 } else if (type == SVt_PVHV) {
66 what = "hash";
67 } else {
68 what = type == SVt_PVAV ? "array" : "scalar";
69 }
de6f7947 70 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
71 Perl_croak(aTHX_ "Bad symbol for %s", what);
72 }
d5713896
NC
73
74 if (type == SVt_PVHV) {
75 where = (SV **)&GvHV(gv);
76 } else if (type == SVt_PVAV) {
77 where = (SV **)&GvAV(gv);
bb85b28a
NC
78 } else if (type == SVt_PVIO) {
79 where = (SV **)&GvIOp(gv);
d5713896
NC
80 } else {
81 where = &GvSV(gv);
82 }
7918f24d 83
d5713896
NC
84 if (!*where)
85 *where = newSV_type(type);
986d39ee
FC
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
79072805
LW
89 return gv;
90}
91
92GV *
864dbfa3 93Perl_gv_fetchfile(pTHX_ const char *name)
79072805 94{
7918f24d 95 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
96 return gv_fetchfile_flags(name, strlen(name), 0);
97}
98
99GV *
100Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
101 const U32 flags)
102{
97aff369 103 dVAR;
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW
107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS
116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC
122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
5a9a79a4
FC
132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
133 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
53d95988
CS
134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW
136 return gv;
137}
138
62d55b22
NC
139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d
NC
153 PERL_ARGS_ASSERT_GV_CONST_SV;
154
62d55b22
NC
155 if (SvTYPE(gv) == SVt_PVGV)
156 return cv_const_sv(GvCVu(gv));
6f1b3ab0 157 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC
158}
159
12816592
NC
160GP *
161Perl_newGP(pTHX_ GV *const gv)
162{
163 GP *gp;
19bad673 164 U32 hash;
19bad673
NC
165 const char *file;
166 STRLEN len;
2639089b 167#ifndef USE_ITHREADS
6b352265 168 GV *filegv;
2639089b 169#endif
c2587955 170 dVAR;
19bad673 171
7918f24d 172 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
173 Newxz(gp, 1, GP);
174 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
175#ifndef PERL_DONT_CREATE_GVSV
176 gp->gp_sv = newSV(0);
177#endif
7918f24d 178
2639089b
DD
179 if (PL_curcop) {
180 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 181#ifdef USE_ITHREADS
2639089b
DD
182 if (CopFILE(PL_curcop)) {
183 file = CopFILE(PL_curcop);
184 len = strlen(file);
185 }
2639089b 186#else
cb0d3385
FC
187 filegv = CopFILEGV(PL_curcop);
188 if (filegv) {
189 file = GvNAME(filegv)+2;
190 len = GvNAMELEN(filegv)-2;
191 }
6e314d4f 192#endif
cb0d3385
FC
193 else goto no_file;
194 }
195 else {
196 no_file:
19bad673
NC
197 file = "";
198 len = 0;
199 }
f4890806
NC
200
201 PERL_HASH(hash, file, len);
f4890806 202 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
203 gp->gp_refcnt = 1;
204
205 return gp;
206}
207
803f2748
DM
208/* Assign CvGV(cv) = gv, handling weak references.
209 * See also S_anonymise_cv_maybe */
210
211void
212Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
213{
214 GV * const oldgv = CvGV(cv);
b290562e 215 HEK *hek;
803f2748
DM
216 PERL_ARGS_ASSERT_CVGV_SET;
217
218 if (oldgv == gv)
219 return;
220
221 if (oldgv) {
cfc1e951 222 if (CvCVGV_RC(cv)) {
e7881358 223 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
224 CvCVGV_RC_off(cv);
225 }
803f2748 226 else {
803f2748
DM
227 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
228 }
229 }
b290562e 230 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
803f2748 231
b290562e 232 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 233 assert(!CvCVGV_RC(cv));
803f2748
DM
234
235 if (!gv)
236 return;
237
c794ca97
DM
238 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
239 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
240 else {
cfc1e951 241 CvCVGV_RC_on(cv);
803f2748
DM
242 SvREFCNT_inc_simple_void_NN(gv);
243 }
803f2748
DM
244}
245
c68d9564
Z
246/* Assign CvSTASH(cv) = st, handling weak references. */
247
248void
249Perl_cvstash_set(pTHX_ CV *cv, HV *st)
250{
251 HV *oldst = CvSTASH(cv);
252 PERL_ARGS_ASSERT_CVSTASH_SET;
253 if (oldst == st)
254 return;
255 if (oldst)
256 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
257 SvANY(cv)->xcv_stash = st;
258 if (st)
259 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
260}
803f2748 261
e1104062
FC
262/*
263=for apidoc gv_init_pvn
264
265Converts a scalar into a typeglob. This is an incoercible typeglob;
266assigning a reference to it will assign to one of its slots, instead of
267overwriting it as happens with typeglobs created by SvSetSV. Converting
268any scalar that is SvOK() may produce unpredictable results and is reserved
269for perl's internal use.
270
271C<gv> is the scalar to be converted.
272
273C<stash> is the parent stash/package, if any.
274
04ec7e59
FC
275C<name> and C<len> give the name. The name must be unqualified;
276that is, it must not include the package name. If C<gv> is a
e1104062
FC
277stash element, it is the caller's responsibility to ensure that the name
278passed to this function matches the name of the element. If it does not
279match, perl's internal bookkeeping will get out of sync.
280
04ec7e59
FC
281C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
282the return value of SvUTF8(sv). It can also take the
283GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
284seen before (i.e., suppress "Used once" warnings).
285
286=for apidoc gv_init
287
288The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
289has no flags parameter. If the C<multi> parameter is set, the
290GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
291
292=for apidoc gv_init_pv
293
294Same as gv_init_pvn(), but takes a nul-terminated string for the name
295instead of separate char * and length parameters.
296
297=for apidoc gv_init_sv
298
299Same as gv_init_pvn(), but takes an SV * for the name instead of separate
300char * and length parameters. C<flags> is currently unused.
301
302=cut
303*/
304
463ee0b2 305void
04ec7e59 306Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
307{
308 char *namepv;
309 STRLEN namelen;
310 PERL_ARGS_ASSERT_GV_INIT_SV;
311 namepv = SvPV(namesv, namelen);
312 if (SvUTF8(namesv))
313 flags |= SVf_UTF8;
04ec7e59 314 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
315}
316
317void
04ec7e59 318Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
319{
320 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 321 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
322}
323
324void
04ec7e59 325Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 326{
27da23d5 327 dVAR;
3b6733bf
NC
328 const U32 old_type = SvTYPE(gv);
329 const bool doproto = old_type > SVt_NULL;
f9509170 330 char * const proto = (doproto && SvPOK(gv))
dad95a0a 331 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 332 : NULL;
49a54bbe 333 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 334 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 335 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 336 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 337
e6066781 338 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
339 assert (!(proto && has_constant));
340
341 if (has_constant) {
5c1f4d79
NC
342 /* The constant has to be a simple scalar type. */
343 switch (SvTYPE(has_constant)) {
5c1f4d79
NC
344 case SVt_PVHV:
345 case SVt_PVCV:
346 case SVt_PVFM:
347 case SVt_PVIO:
348 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
349 sv_reftype(has_constant, 0));
42d0e0b7 350 default: NOOP;
5c1f4d79 351 }
756cb477
NC
352 SvRV_set(gv, NULL);
353 SvROK_off(gv);
354 }
463ee0b2 355
3b6733bf
NC
356
357 if (old_type < SVt_PVGV) {
358 if (old_type >= SVt_PV)
359 SvCUR_set(gv, 0);
ad64d0ec 360 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 361 }
55d729e4
GS
362 if (SvLEN(gv)) {
363 if (proto) {
f880fe2f 364 SvPV_set(gv, NULL);
b162af07 365 SvLEN_set(gv, 0);
55d729e4
GS
366 SvPOK_off(gv);
367 } else
94010e71 368 Safefree(SvPVX_mutable(gv));
55d729e4 369 }
2e5b91de
NC
370 SvIOK_off(gv);
371 isGV_with_GP_on(gv);
12816592 372
c43ae56f 373 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
374 GvSTASH(gv) = stash;
375 if (stash)
ad64d0ec 376 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 377 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
378 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
379 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 380 if (doproto) {
e3d2b9e7 381 CV *cv;
756cb477
NC
382 if (has_constant) {
383 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 384 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
385 /* In case op.c:S_process_special_blocks stole it: */
386 if (!GvCV(gv))
c43ae56f 387 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 388 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
389 /* If this reference was a copy of another, then the subroutine
390 must have been "imported", by a Perl space assignment to a GV
391 from a reference to CV. */
392 if (exported_constant)
393 GvIMPORTED_CV_on(gv);
186a5ba8 394 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 395 } else {
186a5ba8 396 cv = newSTUB(gv,1);
756cb477 397 }
55d729e4 398 if (proto) {
e3d2b9e7 399 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 400 SV_HAS_TRAILING_NUL);
e0260a5b 401 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
402 }
403 }
463ee0b2
LW
404}
405
76e3520e 406STATIC void
e6066781 407S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 408{
e6066781 409 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 410
a0d0e21e
LW
411 switch (sv_type) {
412 case SVt_PVIO:
413 (void)GvIOn(gv);
414 break;
415 case SVt_PVAV:
416 (void)GvAVn(gv);
417 break;
418 case SVt_PVHV:
419 (void)GvHVn(gv);
420 break;
c69033f2
NC
421#ifdef PERL_DONT_CREATE_GVSV
422 case SVt_NULL:
423 case SVt_PVCV:
424 case SVt_PVFM:
e654831b 425 case SVt_PVGV:
c69033f2
NC
426 break;
427 default:
dbdce04c
NC
428 if(GvSVn(gv)) {
429 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
430 If we just cast GvSVn(gv) to void, it ignores evaluating it for
431 its side effect */
432 }
c69033f2 433#endif
a0d0e21e
LW
434 }
435}
436
0f8d4b5e
FC
437static void core_xsub(pTHX_ CV* cv);
438
439static GV *
440S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 441 const char * const name, const STRLEN len)
0f8d4b5e
FC
442{
443 const int code = keyword(name, len, 1);
444 static const char file[] = __FILE__;
97021f77 445 CV *cv, *oldcompcv = NULL;
0f8d4b5e 446 int opnum = 0;
0f8d4b5e 447 bool ampable = TRUE; /* &{}-able */
97021f77
FC
448 COP *oldcurcop = NULL;
449 yy_parser *oldparser = NULL;
450 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
451
452 assert(gv || stash);
453 assert(name);
0f8d4b5e 454
88b892d8
FC
455 if (!code) return NULL; /* Not a keyword */
456 switch (code < 0 ? -code : code) {
0f8d4b5e 457 /* no support for \&CORE::infix;
d885f758 458 no support for funcs that do not parse like funcs */
88b892d8
FC
459 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
460 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp: case KEY_CORE :
eb31eb35 461 case KEY_default : case KEY_DESTROY:
88b892d8 462 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 463 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 464 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 465 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
466 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
467 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
468 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 469 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 470 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 471 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 472 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 473 case KEY_state: case KEY_sub :
46bef06f 474 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
475 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
476 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
477 return NULL;
478 case KEY_chdir:
eb31eb35 479 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 480 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC
481 case KEY_keys:
482 case KEY_lstat:
483 case KEY_pop:
484 case KEY_push:
485 case KEY_shift:
a99f2ca2 486 case KEY_splice: case KEY_split:
0f8d4b5e
FC
487 case KEY_stat:
488 case KEY_system:
489 case KEY_truncate: case KEY_unlink:
490 case KEY_unshift:
491 case KEY_values:
492 ampable = FALSE;
493 }
494 if (!gv) {
495 gv = (GV *)newSV(0);
496 gv_init(gv, stash, name, len, TRUE);
497 }
7e68c38b 498 GvMULTI_on(gv);
0f8d4b5e
FC
499 if (ampable) {
500 ENTER;
501 oldcurcop = PL_curcop;
502 oldparser = PL_parser;
503 lex_start(NULL, NULL, 0);
504 oldcompcv = PL_compcv;
505 PL_compcv = NULL; /* Prevent start_subparse from setting
506 CvOUTSIDE. */
507 oldsavestack_ix = start_subparse(FALSE,0);
508 cv = PL_compcv;
509 }
510 else {
511 /* Avoid calling newXS, as it calls us, and things start to
512 get hairy. */
513 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
514 GvCV_set(gv,cv);
515 GvCVGEN(gv) = 0;
516 mro_method_changed_in(GvSTASH(gv));
517 CvISXSUB_on(cv);
518 CvXSUB(cv) = core_xsub;
519 }
520 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
521 from PL_curcop. */
522 (void)gv_fetchfile(file);
523 CvFILE(cv) = (char *)file;
524 /* XXX This is inefficient, as doing things this order causes
525 a prototype check in newATTRSUB. But we have to do
526 it this order as we need an op number before calling
527 new ATTRSUB. */
528 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 529 if (stash)
73c02f15 530 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 531 if (ampable) {
4428fb0e
TC
532#ifdef DEBUGGING
533 CV *orig_cv = cv;
534#endif
0f8d4b5e 535 CvLVALUE_on(cv);
4428fb0e
TC
536 /* newATTRSUB will free the CV and return NULL if we're still
537 compiling after a syntax error */
538 if ((cv = newATTRSUB_flags(
7e68c38b 539 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
540 NULL,NULL,
541 coresub_op(
542 opnum
543 ? newSVuv((UV)opnum)
544 : newSVpvn(name,len),
545 code, opnum
7e68c38b
FC
546 ),
547 1
4428fb0e
TC
548 )) != NULL) {
549 assert(GvCV(gv) == orig_cv);
550 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
551 && opnum != OP_UNDEF)
552 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
553 }
0f8d4b5e
FC
554 LEAVE;
555 PL_parser = oldparser;
556 PL_curcop = oldcurcop;
557 PL_compcv = oldcompcv;
558 }
4428fb0e
TC
559 if (cv) {
560 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
561 cv_set_call_checker(
562 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
563 );
564 SvREFCNT_dec(opnumsv);
565 }
566
0f8d4b5e
FC
567 return gv;
568}
569
954c1994 570/*
6c53d59b
FC
571=for apidoc gv_fetchmeth
572
573Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
574
e6919483
BF
575=for apidoc gv_fetchmeth_sv
576
577Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
578of an SV instead of a string/length pair.
579
580=cut
581*/
582
583GV *
584Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
585{
586 char *namepv;
587 STRLEN namelen;
588 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
589 namepv = SvPV(namesv, namelen);
590 if (SvUTF8(namesv))
591 flags |= SVf_UTF8;
592 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
593}
594
595/*
596=for apidoc gv_fetchmeth_pv
597
598Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
599instead of a string/length pair.
600
601=cut
602*/
603
604GV *
605Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
606{
607 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
608 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
609}
610
611/*
612=for apidoc gv_fetchmeth_pvn
954c1994
GS
613
614Returns the glob with the given C<name> and a defined subroutine or
615C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 616accessible via @ISA and UNIVERSAL::.
954c1994
GS
617
618The argument C<level> should be either 0 or -1. If C<level==0>, as a
619side-effect creates a glob with the given C<name> in the given C<stash>
620which in the case of success contains an alias for the subroutine, and sets
e1a479c5 621up caching info for this glob.
954c1994 622
aae43805
FC
623The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
624
625GV_SUPER indicates that we want to look up the method in the superclasses
626of the C<stash>.
e6919483 627
aae43805 628The
954c1994 629GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 630visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 631the GV directly; instead, you should use the method's CV, which can be
b267980d 632obtained from the GV with the C<GvCV> macro.
954c1994
GS
633
634=cut
635*/
636
e1a479c5
BB
637/* NOTE: No support for tied ISA */
638
79072805 639GV *
e6919483 640Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 641{
97aff369 642 dVAR;
463ee0b2 643 GV** gvp;
e1a479c5
BB
644 AV* linear_av;
645 SV** linear_svp;
646 SV* linear_sv;
aae43805 647 HV* cstash, *cachestash;
e1a479c5
BB
648 GV* candidate = NULL;
649 CV* cand_cv = NULL;
e1a479c5 650 GV* topgv = NULL;
bfcb3514 651 const char *hvname;
e1a479c5
BB
652 I32 create = (level >= 0) ? 1 : 0;
653 I32 items;
e1a479c5 654 U32 topgen_cmp;
04f3bf56 655 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 656
e6919483 657 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 658
af09ea45
IK
659 /* UNIVERSAL methods should be callable without a stash */
660 if (!stash) {
e1a479c5 661 create = 0; /* probably appropriate */
da51bb9b 662 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
663 return 0;
664 }
665
e1a479c5
BB
666 assert(stash);
667
bfcb3514
NC
668 hvname = HvNAME_get(stash);
669 if (!hvname)
e1a479c5 670 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 671
e1a479c5
BB
672 assert(hvname);
673 assert(name);
463ee0b2 674
aae43805
FC
675 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
676 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 677
dd69841b 678 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 679
aae43805
FC
680 if (flags & GV_SUPER) {
681 if (!HvAUX(stash)->xhv_super) HvAUX(stash)->xhv_super = newHV();
682 cachestash = HvAUX(stash)->xhv_super;
683 }
684 else cachestash = stash;
685
e1a479c5 686 /* check locally for a real method or a cache entry */
aae43805
FC
687 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
688 create);
e1a479c5
BB
689 if(gvp) {
690 topgv = *gvp;
0f8d4b5e 691 have_gv:
e1a479c5
BB
692 assert(topgv);
693 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 694 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
695 if ((cand_cv = GvCV(topgv))) {
696 /* If genuine method or valid cache entry, use it */
697 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
698 return topgv;
699 }
700 else {
701 /* stale cache entry, junk it and move on */
e7881358 702 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
703 GvCV_set(topgv, NULL);
704 cand_cv = NULL;
e1a479c5
BB
705 GvCVGEN(topgv) = 0;
706 }
707 }
708 else if (GvCVGEN(topgv) == topgen_cmp) {
709 /* cache indicates no such method definitively */
710 return 0;
711 }
aae43805
FC
712 else if (stash == cachestash
713 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 714 && strnEQ(hvname, "CORE", 4)
87566176 715 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 716 goto have_gv;
463ee0b2 717 }
79072805 718
aae43805 719 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
720 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
721 items = AvFILLp(linear_av); /* no +1, to skip over self */
722 while (items--) {
723 linear_sv = *linear_svp++;
724 assert(linear_sv);
725 cstash = gv_stashsv(linear_sv, 0);
726
dd69841b 727 if (!cstash) {
ecad31f0 728 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 729 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 730 SVfARG(linear_sv),
d0c0e7dd 731 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
732 continue;
733 }
9607fc9c 734
e1a479c5
BB
735 assert(cstash);
736
c60dbbc3 737 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
738 if (!gvp) {
739 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
740 const char *hvname = HvNAME(cstash); assert(hvname);
741 if (strnEQ(hvname, "CORE", 4)
742 && (candidate =
87566176 743 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
744 ))
745 goto have_candidate;
746 }
747 continue;
748 }
749 else candidate = *gvp;
750 have_candidate:
e1a479c5 751 assert(candidate);
04f3bf56 752 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 753 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
754 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
755 /*
756 * Found real method, cache method in topgv if:
757 * 1. topgv has no synonyms (else inheritance crosses wires)
758 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
759 */
760 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
761 CV *old_cv = GvCV(topgv);
762 SvREFCNT_dec(old_cv);
e1a479c5 763 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 764 GvCV_set(topgv, cand_cv);
e1a479c5
BB
765 GvCVGEN(topgv) = topgen_cmp;
766 }
767 return candidate;
768 }
769 }
9607fc9c 770
e1a479c5
BB
771 /* Check UNIVERSAL without caching */
772 if(level == 0 || level == -1) {
aae43805 773 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB
774 if(candidate) {
775 cand_cv = GvCV(candidate);
776 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
777 CV *old_cv = GvCV(topgv);
778 SvREFCNT_dec(old_cv);
e1a479c5 779 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 780 GvCV_set(topgv, cand_cv);
e1a479c5
BB
781 GvCVGEN(topgv) = topgen_cmp;
782 }
783 return candidate;
784 }
785 }
786
787 if (topgv && GvREFCNT(topgv) == 1) {
788 /* cache the fact that the method is not defined */
789 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
790 }
791
79072805
LW
792 return 0;
793}
794
954c1994 795/*
460e5730
FC
796=for apidoc gv_fetchmeth_autoload
797
798This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
799parameter.
800
d21989ed 801=for apidoc gv_fetchmeth_sv_autoload
611c1e95 802
d21989ed
BF
803Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
804of an SV instead of a string/length pair.
805
806=cut
807*/
808
809GV *
810Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
811{
812 char *namepv;
813 STRLEN namelen;
814 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
815 namepv = SvPV(namesv, namelen);
816 if (SvUTF8(namesv))
817 flags |= SVf_UTF8;
818 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
819}
820
821/*
822=for apidoc gv_fetchmeth_pv_autoload
823
824Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
825instead of a string/length pair.
826
827=cut
828*/
829
830GV *
831Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
832{
833 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
834 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
835}
836
837/*
838=for apidoc gv_fetchmeth_pvn_autoload
839
840Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ
841Returns a glob for the subroutine.
842
843For an autoloaded subroutine without a GV, will create a GV even
844if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
845of the result may be zero.
846
d21989ed
BF
847Currently, the only significant value for C<flags> is SVf_UTF8.
848
611c1e95
IZ
849=cut
850*/
851
852GV *
d21989ed 853Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 854{
499321d3 855 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 856
d21989ed 857 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 858
611c1e95 859 if (!gv) {
611c1e95
IZ
860 CV *cv;
861 GV **gvp;
862
863 if (!stash)
6136c704 864 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 865 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 866 return NULL;
d21989ed 867 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 868 return NULL;
611c1e95
IZ
869 cv = GvCV(gv);
870 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 871 return NULL;
611c1e95
IZ
872 /* Have an autoload */
873 if (level < 0) /* Cannot do without a stub */
d21989ed 874 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
875 gvp = (GV**)hv_fetch(stash, name,
876 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 877 if (!gvp)
6136c704 878 return NULL;
611c1e95
IZ
879 return *gvp;
880 }
881 return gv;
882}
883
884/*
954c1994
GS
885=for apidoc gv_fetchmethod_autoload
886
887Returns the glob which contains the subroutine to call to invoke the method
888on the C<stash>. In fact in the presence of autoloading this may be the
889glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 890already setup.
954c1994
GS
891
892The third parameter of C<gv_fetchmethod_autoload> determines whether
893AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 894means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 895Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 896with a non-zero C<autoload> parameter.
954c1994
GS
897
898These functions grant C<"SUPER"> token as a prefix of the method name. Note
899that if you want to keep the returned glob for a long time, you need to
900check for it being "AUTOLOAD", since at the later time the call may load a
901different subroutine due to $AUTOLOAD changing its value. Use the glob
b267980d 902created via a side effect to do this.
954c1994
GS
903
904These functions have the same side-effects and as C<gv_fetchmeth> with
905C<level==0>. C<name> should be writable if contains C<':'> or C<'
906''>. The warning against passing the GV returned by C<gv_fetchmeth> to
b267980d 907C<call_sv> apply equally to these functions.
954c1994
GS
908
909=cut
910*/
911
dc848c6f 912GV *
864dbfa3 913Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 914{
547bb267
NC
915 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
916
256d1bb2
NC
917 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
918}
919
44130a26
BF
920GV *
921Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
922{
923 char *namepv;
924 STRLEN namelen;
925 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
926 namepv = SvPV(namesv, namelen);
927 if (SvUTF8(namesv))
928 flags |= SVf_UTF8;
929 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
930}
931
932GV *
933Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
934{
935 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
936 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
937}
938
256d1bb2
NC
939/* Don't merge this yet, as it's likely to get a len parameter, and possibly
940 even a U32 hash */
941GV *
44130a26 942Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 943{
97aff369 944 dVAR;
eb578fdb 945 const char *nend;
c445ea15 946 const char *nsplit = NULL;
a0d0e21e 947 GV* gv;
0dae17bd 948 HV* ostash = stash;
c94593d0 949 const char * const origname = name;
ad64d0ec 950 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
951 const U32 autoload = flags & GV_AUTOLOAD;
952 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 953 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 954
44130a26 955 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 956
eff494dd 957 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 958 stash = NULL;
c9bf4021
NC
959 else {
960 /* The only way stash can become NULL later on is if nsplit is set,
961 which in turn means that there is no need for a SVt_PVHV case
962 the error reporting code. */
963 }
b267980d 964
44130a26 965 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 966 if (*nend == '\'') {
a0d0e21e 967 nsplit = nend;
c94593d0
NC
968 name = nend + 1;
969 }
970 else if (*nend == ':' && *(nend + 1) == ':') {
971 nsplit = nend++;
972 name = nend + 1;
973 }
a0d0e21e
LW
974 }
975 if (nsplit) {
7edbdc6b 976 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 977 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
978 stash = CopSTASH(PL_curcop);
979 flags |= GV_SUPER;
cea2e8a9 980 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 981 origname, HvENAME_get(stash), name) );
4633a7c4 982 }
aae43805
FC
983 else if ((nsplit - origname) >= 7 &&
984 strnEQ(nsplit - 7, "::SUPER", 7)) {
985 /* don't autovifify if ->NoSuchStash::SUPER::method */
986 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
987 if (stash) flags |= GV_SUPER;
988 }
e189a56d 989 else {
af09ea45 990 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 991 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 992 }
0dae17bd 993 ostash = stash;
4633a7c4
LW
994 }
995
14d1dfbd 996 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 997 if (!gv) {
2f6e0fe7 998 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 999 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1000 else if (autoload)
c8416c26
BF
1001 gv = gv_autoload_pvn(
1002 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1003 );
256d1bb2
NC
1004 if (!gv && do_croak) {
1005 /* Right now this is exclusively for the benefit of S_method_common
1006 in pp_hot.c */
1007 if (stash) {
15e6cdd9
DG
1008 /* If we can't find an IO::File method, it might be a call on
1009 * a filehandle. If IO:File has not been loaded, try to
1010 * require it first instead of croaking */
1011 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1012 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1013 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1014 STR_WITH_LEN("IO/File.pm"), 0,
1015 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1016 ) {
31b05a0f 1017 require_pv("IO/File.pm");
14d1dfbd 1018 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1019 if (gv)
1020 return gv;
1021 }
256d1bb2 1022 Perl_croak(aTHX_
b17a0679 1023 "Can't locate object method \"%"UTF8f
d0c0e7dd 1024 "\" via package \"%"HEKf"\"",
b17a0679 1025 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1026 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1027 }
1028 else {
ecad31f0 1029 SV* packnamesv;
256d1bb2 1030
256d1bb2 1031 if (nsplit) {
ecad31f0
BF
1032 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1033 SVs_TEMP | is_utf8);
256d1bb2 1034 } else {
017c5e4e 1035 packnamesv = error_report;
256d1bb2
NC
1036 }
1037
1038 Perl_croak(aTHX_
b17a0679
FC
1039 "Can't locate object method \"%"UTF8f
1040 "\" via package \"%"SVf"\""
ecad31f0 1041 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1042 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1043 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1044 }
1045 }
463ee0b2 1046 }
dc848c6f 1047 else if (autoload) {
9d4ba2ae 1048 CV* const cv = GvCV(gv);
09280a33
CS
1049 if (!CvROOT(cv) && !CvXSUB(cv)) {
1050 GV* stubgv;
1051 GV* autogv;
1052
1053 if (CvANON(cv))
1054 stubgv = gv;
1055 else {
1056 stubgv = CvGV(cv);
1057 if (GvCV(stubgv) != cv) /* orphaned import */
1058 stubgv = gv;
1059 }
c8416c26
BF
1060 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1061 GvNAME(stubgv), GvNAMELEN(stubgv),
1062 GV_AUTOLOAD_ISMETHOD
1063 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1064 if (autogv)
1065 gv = autogv;
1066 }
1067 }
44a8e56a
PP
1068
1069 return gv;
1070}
1071
1072GV*
0eeb01b9 1073Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1074{
1075 char *namepv;
1076 STRLEN namelen;
0fe84f7c 1077 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1078 namepv = SvPV(namesv, namelen);
1079 if (SvUTF8(namesv))
1080 flags |= SVf_UTF8;
0eeb01b9 1081 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1082}
1083
1084GV*
0eeb01b9 1085Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1086{
0fe84f7c 1087 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1088 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1089}
1090
1091GV*
0eeb01b9 1092Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1093{
27da23d5 1094 dVAR;
44a8e56a
PP
1095 GV* gv;
1096 CV* cv;
1097 HV* varstash;
1098 GV* vargv;
1099 SV* varsv;
c8416c26
BF
1100 SV *packname = NULL;
1101 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1102
0fe84f7c 1103 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1104
7edbdc6b 1105 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1106 return NULL;
0dae17bd
GS
1107 if (stash) {
1108 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1109 STRLEN packname_len = 0;
1110 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1111 packname = newSVpvn_flags(packname_ptr, packname_len,
1112 SVs_TEMP | SvUTF8(stash));
5c284bb0 1113 stash = NULL;
0dae17bd 1114 }
c8416c26
BF
1115 else
1116 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1117 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1118 }
c8416c26 1119 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
a0714e2c 1120 return NULL;
dc848c6f
PP
1121 cv = GvCV(gv);
1122
adb5a9ae 1123 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1124 return NULL;
ed850460 1125
dc848c6f
PP
1126 /*
1127 * Inheriting AUTOLOAD for non-methods works ... for now.
1128 */
0eeb01b9
FC
1129 if (
1130 !(flags & GV_AUTOLOAD_ISMETHOD)
1131 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1132 )
d1d15184 1133 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1134 "Use of inherited AUTOLOAD for non-method %"SVf
1135 "::%"UTF8f"() is deprecated",
ecad31f0 1136 SVfARG(packname),
b17a0679 1137 UTF8fARG(is_utf8, len, name));
44a8e56a 1138
aed2304a 1139 if (CvISXSUB(cv)) {
bb619f37
FC
1140 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1141 * and split that value on the last '::', pass along the same data
1142 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1143 *
1144 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1145 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1146 * type. Since SvPVX has been documented as returning the sub name
1147 * for a long time, but not as returning the prototype, we have
1148 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1149 * elsewhere.
1150 *
1151 * We put the prototype in the same allocated buffer, but after
1152 * the sub name. The SvPOK flag indicates the presence of a proto-
1153 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1154 * If both flags are on, then SvLEN is used to indicate the end of
1155 * the prototype (artificially lower than what is actually allo-
1156 * cated), at the risk of having to reallocate a few bytes unneces-
1157 * sarily--but that should happen very rarely, if ever.
1158 *
1159 * We use SvUTF8 for both prototypes and sub names, so if one is
1160 * UTF8, the other must be upgraded.
adb5a9ae 1161 */
c68d9564 1162 CvSTASH_set(cv, stash);
8fa6a409 1163 if (SvPOK(cv)) { /* Ouch! */
e7881358 1164 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1165 STRLEN ulen;
1166 const char *proto = CvPROTO(cv);
1167 assert(proto);
1168 if (SvUTF8(cv))
1169 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1170 ulen = SvCUR(tmpsv);
1171 SvCUR(tmpsv)++; /* include null in string */
1172 sv_catpvn_flags(
1173 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1174 );
1175 SvTEMP_on(tmpsv); /* Allow theft */
1176 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1177 SvTEMP_off(tmpsv);
e7881358 1178 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1179 SvLEN(cv) = SvCUR(cv) + 1;
1180 SvCUR(cv) = ulen;
1181 }
1182 else {
1183 sv_setpvn((SV *)cv, name, len);
1184 SvPOK_off(cv);
1185 if (is_utf8)
c8416c26 1186 SvUTF8_on(cv);
8fa6a409
FC
1187 else SvUTF8_off(cv);
1188 }
1189 CvAUTOLOAD_on(cv);
adb5a9ae 1190 }
adb5a9ae 1191
44a8e56a
PP
1192 /*
1193 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1194 * The subroutine's original name may not be "AUTOLOAD", so we don't
1195 * use that, but for lack of anything better we will use the sub's
1196 * original package to look up $AUTOLOAD.
1197 */
1198 varstash = GvSTASH(CvGV(cv));
5c7983e5 1199 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1200 ENTER;
1201
c69033f2 1202 if (!isGV(vargv)) {
04ec7e59 1203 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1204#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1205 GvSV(vargv) = newSV(0);
c69033f2
NC
1206#endif
1207 }
3d35f11b 1208 LEAVE;
e203899d 1209 varsv = GvSVn(vargv);
4bac9ae4
CS
1210 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1211 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1212 sv_setsv(varsv, packname);
396482e1 1213 sv_catpvs(varsv, "::");
d40bf27b
NC
1214 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1215 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1216 sv_catpvn_flags(
1217 varsv, name, len,
5bcd1ef4 1218 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1219 );
c8416c26
BF
1220 if (is_utf8)
1221 SvUTF8_on(varsv);
a0d0e21e
LW
1222 return gv;
1223}
1224
44a2ac75
YO
1225
1226/* require_tie_mod() internal routine for requiring a module
486ec47a 1227 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1228 *
1229 * The "gv" parameter should be the glob.
45cbc99a
RGS
1230 * "varpv" holds the name of the var, used for error messages.
1231 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1232 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1233 * are working reasonably close to as expected.
1234 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1235 * For the protection of $! to work (it is set by this routine)
1236 * the sv slot must already be magicalized.
d2c93421 1237 */
44a2ac75
YO
1238STATIC HV*
1239S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1240{
27da23d5 1241 dVAR;
da51bb9b 1242 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1243
7918f24d
NC
1244 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1245
0ea03996 1246 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS
1247 SV *module = newSVsv(namesv);
1248 char varname = *varpv; /* varpv might be clobbered by load_module,
1249 so save it. For the moment it's always
1250 a single char. */
b82b06b8 1251 const char type = varname == '[' ? '$' : '%';
d2c93421 1252 dSP;
d2c93421 1253 ENTER;
600beb2e 1254 SAVEFREESV(namesv);
44a2ac75 1255 if ( flags & 1 )
45cbc99a 1256 save_scalar(gv);
cac54379 1257 PUSHSTACKi(PERLSI_MAGIC);
45cbc99a 1258 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
cac54379 1259 POPSTACK;
da51bb9b 1260 stash = gv_stashsv(namesv, 0);
44a2ac75 1261 if (!stash)
b82b06b8
FC
1262 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1263 type, varname, SVfARG(namesv));
45cbc99a 1264 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC
1265 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1266 type, varname, SVfARG(namesv), methpv);
600beb2e 1267 LEAVE;
d2c93421 1268 }
e7881358 1269 else SvREFCNT_dec_NN(namesv);
44a2ac75 1270 return stash;
d2c93421
RH
1271}
1272
954c1994
GS
1273/*
1274=for apidoc gv_stashpv
1275
da51bb9b 1276Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1277determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1278
1279=cut
1280*/
1281
a0d0e21e 1282HV*
864dbfa3 1283Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1284{
7918f24d 1285 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1286 return gv_stashpvn(name, strlen(name), create);
1287}
1288
bc96cb06
SH
1289/*
1290=for apidoc gv_stashpvn
1291
da51bb9b
NC
1292Returns a pointer to the stash for a specified package. The C<namelen>
1293parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1294to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1295created if it does not already exist. If the package does not exist and
1296C<flags> is 0 (or any other setting that does not create packages) then NULL
1297is returned.
1298
566a4718
YO
1299Flags may be one of:
1300
1301 GV_ADD
1302 SVf_UTF8
1303 GV_NOADD_NOINIT
1304 GV_NOINIT
1305 GV_NOEXPAND
1306 GV_ADDMG
1307
1308The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH
1309
1310=cut
1311*/
1312
dc437b57 1313HV*
da51bb9b 1314Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1315{
0cea0058 1316 char smallbuf[128];
46fc3d4c 1317 char *tmpbuf;
a0d0e21e
LW
1318 HV *stash;
1319 GV *tmpgv;
add0ecde 1320 U32 tmplen = namelen + 2;
dc437b57 1321
7918f24d
NC
1322 PERL_ARGS_ASSERT_GV_STASHPVN;
1323
add0ecde 1324 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1325 tmpbuf = smallbuf;
1326 else
add0ecde
VP
1327 Newx(tmpbuf, tmplen, char);
1328 Copy(name, tmpbuf, namelen, char);
1329 tmpbuf[namelen] = ':';
1330 tmpbuf[namelen+1] = ':';
1331 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1332 if (tmpbuf != smallbuf)
1333 Safefree(tmpbuf);
a0d0e21e 1334 if (!tmpgv)
da51bb9b 1335 return NULL;
a0d0e21e 1336 stash = GvHV(tmpgv);
1f656fcf 1337 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1338 assert(stash);
1f656fcf 1339 if (!HvNAME_get(stash)) {
0be4d16f 1340 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1341
1342 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1343 /* If the containing stash has multiple effective
1344 names, see that this one gets them, too. */
1345 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1346 mro_package_moved(stash, NULL, tmpgv, 1);
1347 }
a0d0e21e 1348 return stash;
463ee0b2
LW
1349}
1350
954c1994
GS
1351/*
1352=for apidoc gv_stashsv
1353
da51bb9b 1354Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS
1355
1356=cut
1357*/
1358
a0d0e21e 1359HV*
da51bb9b 1360Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1361{
dc437b57 1362 STRLEN len;
9d4ba2ae 1363 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC
1364
1365 PERL_ARGS_ASSERT_GV_STASHSV;
1366
0be4d16f 1367 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW
1368}
1369
1370
463ee0b2 1371GV *
fe9845cc 1372Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1373 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1374 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1375}
1376
1377GV *
fe9845cc 1378Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1379 STRLEN len;
77cb3b01
FC
1380 const char * const nambeg =
1381 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1382 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1383 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1384}
1385
ad7cce9f 1386STATIC void
290a1700 1387S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1388{
1389 AV* av;
1390
1391 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1392
1393 av = GvAVn(gv);
1394 GvMULTI_on(gv);
1395 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1396 NULL, 0);
ad7cce9f
FR
1397}
1398
7a5fd60d
NC
1399GV *
1400Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
fe9845cc 1401 const svtype sv_type)
79072805 1402{
97aff369 1403 dVAR;
eb578fdb
KW
1404 const char *name = nambeg;
1405 GV *gv = NULL;
79072805 1406 GV**gvp;
b17a0679 1407 STRLEN len;
eb578fdb 1408 const char *name_cursor;
c445ea15 1409 HV *stash = NULL;
add2581e 1410 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
e26df76a 1411 const I32 no_expand = flags & GV_NOEXPAND;
780a5241 1412 const I32 add = flags & ~GV_NOADD_MASK;
04f3bf56 1413 const U32 is_utf8 = flags & SVf_UTF8;
9da346da 1414 bool addmg = !!(flags & GV_ADDMG);
b3d904f3
NC
1415 const char *const name_end = nambeg + full_len;
1416 const char *const name_em1 = name_end - 1;
5e0caaeb 1417 U32 faking_it;
79072805 1418
7918f24d
NC
1419 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1420
fafc274c
NC
1421 if (flags & GV_NOTQUAL) {
1422 /* Caller promised that there is no stash, so we can skip the check. */
1423 len = full_len;
1424 goto no_stash;
1425 }
1426
ecad31f0 1427 if (full_len > 2 && *name == '*' && isIDFIRST_lazy_if(name + 1, is_utf8)) {
b208e10c 1428 /* accidental stringify on a GV? */
c07a80fd 1429 name++;
b208e10c 1430 }
c07a80fd 1431
b3d904f3 1432 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
46c0ec20
FC
1433 if (name_cursor < name_em1 &&
1434 ((*name_cursor == ':'
b3d904f3 1435 && name_cursor[1] == ':')
46c0ec20 1436 || *name_cursor == '\''))
463ee0b2 1437 {
463ee0b2 1438 if (!stash)
3280af22 1439 stash = PL_defstash;
dc437b57 1440 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1441 return NULL;
463ee0b2 1442
b3d904f3 1443 len = name_cursor - name;
088225fd 1444 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
3a5b580c
NC
1445 const char *key;
1446 if (*name_cursor == ':') {
1447 key = name;
e771aaa9
NC
1448 len += 2;
1449 } else {
3a5b580c 1450 char *tmpbuf;
2ae0db35 1451 Newx(tmpbuf, len+2, char);
e771aaa9
NC
1452 Copy(name, tmpbuf, len, char);
1453 tmpbuf[len++] = ':';
1454 tmpbuf[len++] = ':';
3a5b580c 1455 key = tmpbuf;
e771aaa9 1456 }
0be4d16f 1457 gvp = (GV**)hv_fetch(stash, key, is_utf8 ? -len : len, add);
a0714e2c 1458 gv = gvp ? *gvp : NULL;
159b6efe 1459 if (gv && gv != (const GV *)&PL_sv_undef) {
6fa846a0 1460 if (SvTYPE(gv) != SVt_PVGV)
04ec7e59 1461 gv_init_pvn(gv, stash, key, len, (add & GV_ADDMULTI)|is_utf8);
6fa846a0
GS
1462 else
1463 GvMULTI_on(gv);
1464 }
3a5b580c 1465 if (key != name)
b9d2ea5b 1466 Safefree(key);
159b6efe 1467 if (!gv || gv == (const GV *)&PL_sv_undef)
a0714e2c 1468 return NULL;
85e6fe83 1469
463ee0b2 1470 if (!(stash = GvHV(gv)))
298d6511 1471 {
99ee9762
FC
1472 stash = GvHV(gv) = newHV();
1473 if (!HvNAME_get(stash)) {
e058c50a
FC
1474 if (GvSTASH(gv) == PL_defstash && len == 6
1475 && strnEQ(name, "CORE", 4))
1476 hv_name_set(stash, "CORE", 4, 0);
1477 else
1478 hv_name_set(
0be4d16f 1479 stash, nambeg, name_cursor-nambeg, is_utf8
e058c50a 1480 );
99ee9762
FC
1481 /* If the containing stash has multiple effective
1482 names, see that this one gets them, too. */
1483 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1484 mro_package_moved(stash, NULL, gv, 1);
1485 }
298d6511 1486 }
99ee9762 1487 else if (!HvNAME_get(stash))
0be4d16f 1488 hv_name_set(stash, nambeg, name_cursor - nambeg, is_utf8);
463ee0b2
LW
1489 }
1490
b3d904f3
NC
1491 if (*name_cursor == ':')
1492 name_cursor++;
088225fd 1493 name = name_cursor+1;
ad6bfa9d 1494 if (name == name_end)
159b6efe
NC
1495 return gv
1496 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
79072805 1497 }
79072805 1498 }
b3d904f3 1499 len = name_cursor - name;
463ee0b2
LW
1500
1501 /* No stash in name, so see how we can default */
1502
1503 if (!stash) {
fafc274c 1504 no_stash:
8d40577b 1505 if (len && isIDFIRST_lazy_if(name, is_utf8)) {
9607fc9c
PP
1506 bool global = FALSE;
1507
8ccce9ae
NC
1508 switch (len) {
1509 case 1:
18ea00d7 1510 if (*name == '_')
9d116dd7 1511 global = TRUE;
18ea00d7 1512 break;
8ccce9ae
NC
1513 case 3:
1514 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1515 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1516 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
9d116dd7 1517 global = TRUE;
18ea00d7 1518 break;
8ccce9ae
NC
1519 case 4:
1520 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1521 && name[3] == 'V')
9d116dd7 1522 global = TRUE;
18ea00d7 1523 break;
8ccce9ae
NC
1524 case 5:
1525 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1526 && name[3] == 'I' && name[4] == 'N')
463ee0b2 1527 global = TRUE;
18ea00d7 1528 break;
8ccce9ae
NC
1529 case 6:
1530 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1531 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1532 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1533 global = TRUE;
1534 break;
1535 case 7:
1536 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1537 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1538 && name[6] == 'T')
18ea00d7
NC
1539 global = TRUE;
1540 break;
463ee0b2 1541 }
9607fc9c 1542
463ee0b2 1543 if (global)
3280af22 1544 stash = PL_defstash;
923e4eb5 1545 else if (IN_PERL_COMPILETIME) {
3280af22
NIS
1546 stash = PL_curstash;
1547 if (add && (PL_hints & HINT_STRICT_VARS) &&
748a9306
LW
1548 sv_type != SVt_PVCV &&
1549 sv_type != SVt_PVGV &&
4633a7c4 1550 sv_type != SVt_PVFM &&
c07a80fd 1551 sv_type != SVt_PVIO &&
70ec6265
NC
1552 !(len == 1 && sv_type == SVt_PV &&
1553 (*name == 'a' || *name == 'b')) )
748a9306 1554 {
0be4d16f 1555 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,0);
4633a7c4 1556 if (!gvp ||
159b6efe 1557 *gvp == (const GV *)&PL_sv_undef ||
a5f75d66
AD
1558 SvTYPE(*gvp) != SVt_PVGV)
1559 {
d4c19fe8 1560 stash = NULL;
a5f75d66 1561 }
155aba94
GS
1562 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1563 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1564 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
4633a7c4 1565 {
fe13d51d 1566 /* diag_listed_as: Variable "%s" is not imported%s */
413ff9f6
FC
1567 Perl_ck_warner_d(
1568 aTHX_ packWARN(WARN_MISC),
b17a0679 1569 "Variable \"%c%"UTF8f"\" is not imported",
4633a7c4
LW
1570 sv_type == SVt_PVAV ? '@' :
1571 sv_type == SVt_PVHV ? '%' : '$',
b17a0679 1572 UTF8fARG(is_utf8, len, name));
8ebc5c01 1573 if (GvCVu(*gvp))
413ff9f6
FC
1574 Perl_ck_warner_d(
1575 aTHX_ packWARN(WARN_MISC),
b17a0679
FC
1576 "\t(Did you mean &%"UTF8f" instead?)\n",
1577 UTF8fARG(is_utf8, len, name)
413ff9f6 1578 );
d4c19fe8 1579 stash = NULL;
4633a7c4 1580 }
a0d0e21e 1581 }
85e6fe83 1582 }
463ee0b2 1583 else
1d7c1841 1584 stash = CopSTASH(PL_curcop);
463ee0b2
LW
1585 }
1586 else
3280af22 1587 stash = PL_defstash;
463ee0b2
LW
1588 }
1589
1590 /* By this point we should have a stash and a name */
1591
a0d0e21e 1592 if (!stash) {
49bb71ae 1593 if (add && !PL_in_clean_all) {
9d4ba2ae 1594 SV * const err = Perl_mess(aTHX_
b17a0679
FC
1595 "Global symbol \"%s%"UTF8f
1596 "\" requires explicit package name",
5a844595
GS
1597 (sv_type == SVt_PV ? "$"
1598 : sv_type == SVt_PVAV ? "@"
1599 : sv_type == SVt_PVHV ? "%"
b17a0679 1600 : ""), UTF8fARG(is_utf8, len, name));
e7f343b6 1601 GV *gv;
32833930 1602 if (is_utf8)
608b3986
AE
1603 SvUTF8_on(err);
1604 qerror(err);
76f68e9b 1605 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
e7f343b6
NC
1606 if(!gv) {
1607 /* symbol table under destruction */
1608 return NULL;
1609 }
1610 stash = GvHV(gv);
a0d0e21e 1611 }
d7aacf4e 1612 else
a0714e2c 1613 return NULL;
a0d0e21e
LW
1614 }
1615
1616 if (!SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1617 return NULL;
a0d0e21e 1618
0be4d16f 1619 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
23496c6e
FC
1620 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
1621 if (addmg) gv = (GV *)newSV(0);
1622 else return NULL;
1623 }
914ecc63
FC
1624 else gv = *gvp, addmg = 0;
1625 /* From this point on, addmg means gv has not been inserted in the
1626 symtab yet. */
1627
79072805 1628 if (SvTYPE(gv) == SVt_PVGV) {
a0d0e21e 1629 if (add) {
a5f75d66 1630 GvMULTI_on(gv);
e6066781 1631 gv_init_svtype(gv, sv_type);
ff683671
NC
1632 /* You reach this path once the typeglob has already been created,
1633 either by the same or a different sigil. If this path didn't
1634 exist, then (say) referencing $! first, and %! second would
1635 mean that %! was not handled correctly. */
b82b06b8
FC
1636 if (len == 1 && stash == PL_defstash) {
1637 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
44a2ac75
YO
1638 if (*name == '!')
1639 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
45cbc99a 1640 else if (*name == '-' || *name == '+')
192b9cd1 1641 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
5b6da579 1642 } else if (sv_type == SVt_PV) {
4f650b80
NC
1643 if (*name == '*' || *name == '#') {
1644 /* diag_listed_as: $* is no longer supported */
ff683671
NC
1645 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
1646 WARN_SYNTAX),
4f650b80 1647 "$%c is no longer supported", *name);
5b6da579 1648 }
ff683671 1649 }
a289ef89 1650 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
d3b97530
DM
1651 switch (*name) {
1652 case '[':
1653 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1654 break;
1a904fc8 1655#ifdef PERL_SAWAMPERSAND
d3b97530
DM
1656 case '`':
1657 PL_sawampersand |= SAWAMPERSAND_LEFT;
1658 (void)GvSVn(gv);
1659 break;
1660 case '&':
1661 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
1662 (void)GvSVn(gv);
1663 break;
1664 case '\'':
1665 PL_sawampersand |= SAWAMPERSAND_RIGHT;
1666 (void)GvSVn(gv);
1667 break;
1a904fc8 1668#endif
d3b97530 1669 }
a289ef89 1670 }
45cbc99a 1671 }
af16de9f
FC
1672 else if (len == 3 && sv_type == SVt_PVAV
1673 && strnEQ(name, "ISA", 3)
1674 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1675 gv_magicalize_isa(gv);
a0d0e21e 1676 }
79072805 1677 return gv;
add2581e 1678 } else if (no_init) {
23496c6e 1679 assert(!addmg);
55d729e4 1680 return gv;
e26df76a 1681 } else if (no_expand && SvROK(gv)) {
23496c6e 1682 assert(!addmg);
e26df76a 1683 return gv;
79072805 1684 }
93a17b20 1685
5e0caaeb
NC
1686 /* Adding a new symbol.
1687 Unless of course there was already something non-GV here, in which case
1688 we want to behave as if there was always a GV here, containing some sort
1689 of subroutine.
1690 Otherwise we run the risk of creating things like GvIO, which can cause
1691 subtle bugs. eg the one that tripped up SQL::Translator */
1692
1693 faking_it = SvOK(gv);
93a17b20 1694
9b387841 1695 if (add & GV_ADDWARN)
b17a0679
FC
1696 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
1697 "Had to create %"UTF8f" unexpectedly",
1698 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
04ec7e59 1699 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
93a17b20 1700
ecad31f0
BF
1701 if ( isIDFIRST_lazy_if(name, is_utf8)
1702 && ! (isLEXWARN_on ? ckWARN(WARN_ONCE) : (PL_dowarn & G_WARN_ON ) ) )
0453d815
PM
1703 GvMULTI_on(gv) ;
1704
93a17b20 1705 /* set up magic where warranted */
44428a46 1706 if (stash != PL_defstash) { /* not the main stash */
5fdfd519 1707 /* We only have to check for three names here: EXPORT, ISA
4aaa4757
FC
1708 and VERSION. All the others apply only to the main stash or to
1709 CORE (which is checked right after this). */
f4e68e82 1710 if (len > 2) {
b464bac0 1711 const char * const name2 = name + 1;
cc4c2da6 1712 switch (*name) {
cc4c2da6
NC
1713 case 'E':
1714 if (strnEQ(name2, "XPORT", 5))
1715 GvMULTI_on(gv);
1716 break;
1717 case 'I':
44428a46 1718 if (strEQ(name2, "SA"))
290a1700 1719 gv_magicalize_isa(gv);
cc4c2da6 1720 break;
44428a46
FC
1721 case 'V':
1722 if (strEQ(name2, "ERSION"))
1723 GvMULTI_on(gv);
1724 break;
4aaa4757
FC
1725 default:
1726 goto try_core;
1727 }
23496c6e 1728 goto add_magical_gv;
4aaa4757
FC
1729 }
1730 try_core:
1731 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1732 /* Avoid null warning: */
1733 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1734 if (strnEQ(stashname, "CORE", 4))
1735 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1736 }
1737 }
1738 else if (len > 1) {
1739#ifndef EBCDIC
1740 if (*name > 'V' ) {
1741 NOOP;
1742 /* Nothing else to do.
1743 The compiler will probably turn the switch statement into a
1744 branch table. Make sure we avoid even that small overhead for
1745 the common case of lower case variable names. */
1746 } else
1747#endif
1748 {
1749 const char * const name2 = name + 1;
1750 switch (*name) {
1751 case 'A':
1752 if (strEQ(name2, "RGV")) {
1753 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1754 }
1755 else if (strEQ(name2, "RGVOUT")) {
1756 GvMULTI_on(gv);
1757 }
1758 break;
1759 case 'E':
1760 if (strnEQ(name2, "XPORT", 5))
1761 GvMULTI_on(gv);
1762 break;
1763 case 'I':
1764 if (strEQ(name2, "SA")) {
290a1700 1765 gv_magicalize_isa(gv);
44428a46
FC
1766 }
1767 break;
cc4c2da6
NC
1768 case 'S':
1769 if (strEQ(name2, "IG")) {
1770 HV *hv;
1771 I32 i;
d525a7b2
NC
1772 if (!PL_psig_name) {
1773 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1774 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1775 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1776 } else {
1777 /* I think that the only way to get here is to re-use an
1778 embedded perl interpreter, where the previous
1779 use didn't clean up fully because
1780 PL_perl_destruct_level was 0. I'm not sure that we
1781 "support" that, in that I suspect in that scenario
1782 there are sufficient other garbage values left in the
1783 interpreter structure that something else will crash
1784 before we get here. I suspect that this is one of
1785 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1786 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1787 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1788 }
1789 GvMULTI_on(gv);
1790 hv = GvHVn(gv);
a0714e2c 1791 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1792 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1793 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1794 if (init)
1795 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1796 }
1797 }
1798 break;
1799 case 'V':
1800 if (strEQ(name2, "ERSION"))
1801 GvMULTI_on(gv);
1802 break;
e5218da5
GA
1803 case '\003': /* $^CHILD_ERROR_NATIVE */
1804 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1805 goto magicalize;
1806 break;
cc4c2da6
NC
1807 case '\005': /* $^ENCODING */
1808 if (strEQ(name2, "NCODING"))
1809 goto magicalize;
1810 break;
9ebf26ad
FR
1811 case '\007': /* $^GLOBAL_PHASE */
1812 if (strEQ(name2, "LOBAL_PHASE"))
1813 goto ro_magicalize;
1814 break;
8561ea1d
FC
1815 case '\014': /* $^LAST_FH */
1816 if (strEQ(name2, "AST_FH"))
1817 goto ro_magicalize;
1818 break;
cde0cee5
YO
1819 case '\015': /* $^MATCH */
1820 if (strEQ(name2, "ATCH"))
2fdbfb4d 1821 goto magicalize;
cc4c2da6
NC
1822 case '\017': /* $^OPEN */
1823 if (strEQ(name2, "PEN"))
1824 goto magicalize;
1825 break;
cde0cee5
YO
1826 case '\020': /* $^PREMATCH $^POSTMATCH */
1827 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
9ebf26ad
FR
1828 goto magicalize;
1829 break;
cc4c2da6
NC
1830 case '\024': /* ${^TAINT} */
1831 if (strEQ(name2, "AINT"))
1832 goto ro_magicalize;
1833 break;
7cebcbc0 1834 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1835 if (strEQ(name2, "NICODE"))
cc4c2da6 1836 goto ro_magicalize;
a0288114 1837 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1838 goto ro_magicalize;
e07ea26a
NC
1839 if (strEQ(name2, "TF8CACHE"))
1840 goto magicalize;
cc4c2da6
NC
1841 break;
1842 case '\027': /* $^WARNING_BITS */
1843 if (strEQ(name2, "ARNING_BITS"))
1844 goto magicalize;
1845 break;
1846 case '1':
1847 case '2':
1848 case '3':
1849 case '4':
1850 case '5':
1851 case '6':
1852 case '7':
1853 case '8':
1854 case '9':
85e6fe83 1855 {
2fdbfb4d
AB
1856 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1857 this test */
1858 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC
1859 const char *end = name + len;
1860 while (--end > name) {
23496c6e 1861 if (!isDIGIT(*end)) goto add_magical_gv;
cc4c2da6 1862 }
2fdbfb4d 1863 goto magicalize;
1d7c1841 1864 }
dc437b57 1865 }
93a17b20 1866 }
392db708
NC
1867 } else {
1868 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1869 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1870 switch (*name) {
6361f656
AB
1871 case '&': /* $& */
1872 case '`': /* $` */
1873 case '\'': /* $' */
1a904fc8 1874#ifdef PERL_SAWAMPERSAND
a289ef89 1875 if (!(
cc4c2da6
NC
1876 sv_type == SVt_PVAV ||
1877 sv_type == SVt_PVHV ||
1878 sv_type == SVt_PVCV ||
1879 sv_type == SVt_PVFM ||
1880 sv_type == SVt_PVIO
d3b97530
DM
1881 )) { PL_sawampersand |=
1882 (*name == '`')
1883 ? SAWAMPERSAND_LEFT
1884 : (*name == '&')
1885 ? SAWAMPERSAND_MIDDLE
1886 : SAWAMPERSAND_RIGHT;
1887 }
1a904fc8 1888#endif
2fdbfb4d 1889 goto magicalize;
cc4c2da6 1890
6361f656 1891 case ':': /* $: */
c69033f2 1892 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
1893 goto magicalize;
1894
6361f656 1895 case '?': /* $? */
ff0cee69 1896#ifdef COMPLEX_STATUS
c69033f2 1897 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1898#endif
cc4c2da6 1899 goto magicalize;
ff0cee69 1900
6361f656 1901 case '!': /* $! */
67261566 1902 GvMULTI_on(gv);
44a2ac75 1903 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1904
ad64d0ec 1905 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1906
44a2ac75 1907 /* magicalization must be done before require_tie_mod is called */
67261566 1908 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd
FC
1909 {
1910 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1911 addmg = 0;
44a2ac75 1912 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
ffdb8bcd 1913 }
d2c93421 1914
6cef1e77 1915 break;
6361f656
AB
1916 case '-': /* $- */
1917 case '+': /* $+ */
44a2ac75
YO
1918 GvMULTI_on(gv); /* no used once warnings here */
1919 {
44a2ac75 1920 AV* const av = GvAVn(gv);
ad64d0ec 1921 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1922
ad64d0ec
NC
1923 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1924 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1925 if (avc)
44a2ac75 1926 SvREADONLY_on(GvSVn(gv));
44a2ac75 1927 SvREADONLY_on(av);
67261566
YO
1928
1929 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4
FC
1930 {
1931 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1932 addmg = 0;
192b9cd1 1933 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
213084e4 1934 }
67261566 1935
80305961 1936 break;
cc4c2da6 1937 }
6361f656
AB
1938 case '*': /* $* */
1939 case '#': /* $# */
9b387841 1940 if (sv_type == SVt_PV)
4f650b80 1941 /* diag_listed_as: $* is no longer supported */
9b387841 1942 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1943 "$%c is no longer supported", *name);
8ae1fe26 1944 break;
b3ca2e83
NC
1945 case '\010': /* $^H */
1946 {
1947 HV *const hv = GvHVn(gv);
1948 hv_magic(hv, NULL, PERL_MAGIC_hints);
1949 }
1950 goto magicalize;
b82b06b8 1951 case '[': /* $[ */
7d69d4a6 1952 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1953 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8
FC
1954 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1955 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1956 addmg = 0;
1957 }
7d69d4a6 1958 else goto magicalize;
b82b06b8 1959 break;
cc4c2da6 1960 case '\023': /* $^S */
2fdbfb4d
AB
1961 ro_magicalize:
1962 SvREADONLY_on(GvSVn(gv));
1963 /* FALL THROUGH */
6361f656
AB
1964 case '0': /* $0 */
1965 case '1': /* $1 */
1966 case '2': /* $2 */
1967 case '3': /* $3 */
1968 case '4': /* $4 */
1969 case '5': /* $5 */
1970 case '6': /* $6 */
1971 case '7': /* $7 */
1972 case '8': /* $8 */
1973 case '9': /* $9 */
6361f656
AB
1974 case '^': /* $^ */
1975 case '~': /* $~ */
1976 case '=': /* $= */
1977 case '%': /* $% */
1978 case '.': /* $. */
1979 case '(': /* $( */
1980 case ')': /* $) */
1981 case '<': /* $< */
1982 case '>': /* $> */
1983 case '\\': /* $\ */
1984 case '/': /* $/ */
4505a31f 1985 case '|': /* $| */
9cdac2a2 1986 case '$': /* $$ */
cc4c2da6
NC
1987 case '\001': /* $^A */
1988 case '\003': /* $^C */
1989 case '\004': /* $^D */
1990 case '\005': /* $^E */
1991 case '\006': /* $^F */
cc4c2da6
NC
1992 case '\011': /* $^I, NOT \t in EBCDIC */
1993 case '\016': /* $^N */
1994 case '\017': /* $^O */
1995 case '\020': /* $^P */
1996 case '\024': /* $^T */
1997 case '\027': /* $^W */
1998 magicalize:
ad64d0ec 1999 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2000 break;
e521374c 2001
cc4c2da6 2002 case '\014': /* $^L */
76f68e9b 2003 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2004 break;
6361f656 2005 case ';': /* $; */
76f68e9b 2006 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2007 break;
6361f656 2008 case ']': /* $] */
cc4c2da6 2009 {
3638bf15 2010 SV * const sv = GvSV(gv);
d7aa5382 2011 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2012 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2013 GvSV(gv) = vnumify(PL_patchlevel);
2014 SvREADONLY_on(GvSV(gv));
2015 SvREFCNT_dec(sv);
93a17b20
LW
2016 }
2017 break;
cc4c2da6
NC
2018 case '\026': /* $^V */
2019 {
3638bf15 2020 SV * const sv = GvSV(gv);
f9be5ac8
DM
2021 GvSV(gv) = new_version(PL_patchlevel);
2022 SvREADONLY_on(GvSV(gv));
2023 SvREFCNT_dec(sv);
16070b82
GS
2024 }
2025 break;
cc4c2da6 2026 }
79072805 2027 }
23496c6e
FC
2028 add_magical_gv:
2029 if (addmg) {
2030 if (GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv) || (
2031 GvSV(gv) && (SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv)))
2032 ))
0f43181e 2033 (void)hv_store(stash,name,len,(SV *)gv,0);
e7881358 2034 else SvREFCNT_dec_NN(gv), gv = NULL;
23496c6e 2035 }
e6066781 2036 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2037 return gv;
79072805
LW
2038}
2039
2040void
35a4481c 2041Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2042{
ed60a868 2043 const char *name;
35a4481c 2044 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2045
2046 PERL_ARGS_ASSERT_GV_FULLNAME4;
2047
666ea192 2048 sv_setpv(sv, prefix ? prefix : "");
a0288114 2049
52a6327b 2050 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2051 const STRLEN len = HvNAMELEN(hv);
2052 if (keepmain || strnNE(name, "main", len)) {
2053 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2054 sv_catpvs(sv,"::");
ed60a868 2055 }
43693395 2056 }
ed60a868 2057 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2058 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2059}
2060
2061void
35a4481c 2062Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2063{
099be4f1 2064 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2065
2066 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2067
46c461b5 2068 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2069}
2070
79072805 2071void
51da40ed 2072Perl_gv_check(pTHX_ HV *stash)
79072805 2073{
97aff369 2074 dVAR;
eb578fdb 2075 I32 i;
463ee0b2 2076
7918f24d
NC
2077 PERL_ARGS_ASSERT_GV_CHECK;
2078
8990e307
LW
2079 if (!HvARRAY(stash))
2080 return;
a0d0e21e 2081 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2082 const HE *entry;
51da40ed
FC
2083 /* SvIsCOW is unused on HVs, so we can use it to mark stashes we
2084 are currently searching through recursively. */
2085 SvIsCOW_on(stash);
dc437b57 2086 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2087 GV *gv;
b7787f18 2088 HV *hv;
dc437b57 2089 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2090 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2091 {
51da40ed 2092 if (hv != PL_defstash && hv != stash && !SvIsCOW(hv))
a0d0e21e
LW
2093 gv_check(hv); /* nested package */
2094 }
ecad31f0
BF
2095 else if ( *HeKEY(entry) != '_'
2096 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2097 const char *file;
159b6efe 2098 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2099 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2100 continue;
1d7c1841 2101 file = GvFILE(gv);
1d7c1841 2102 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2103#ifdef USE_ITHREADS
2104 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2105#else
2106 CopFILEGV(PL_curcop)
2107 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2108#endif
9014280d 2109 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2110 "Name \"%"HEKf"::%"HEKf
2111 "\" used only once: possible typo",
2112 HEKfARG(HvNAME_HEK(stash)),
2113 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2114 }
79072805 2115 }
51da40ed 2116 SvIsCOW_off(stash);
79072805
LW
2117 }
2118}
2119
2120GV *
9cc50d5b 2121Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2122{
97aff369 2123 dVAR;
9cc50d5b 2124 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2125 assert(!(flags & ~SVf_UTF8));
7918f24d 2126
b17a0679
FC
2127 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2128 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2129 (long)PL_gensym++),
2130 GV_ADD, SVt_PVGV);
79072805
LW
2131}
2132
2133/* hopefully this is only called on local symbol table entries */
2134
2135GP*
864dbfa3 2136Perl_gp_ref(pTHX_ GP *gp)
79072805 2137{
97aff369 2138 dVAR;
1d7c1841 2139 if (!gp)
d4c19fe8 2140 return NULL;
79072805 2141 gp->gp_refcnt++;
44a8e56a
PP
2142 if (gp->gp_cv) {
2143 if (gp->gp_cvgen) {
e1a479c5
BB
2144 /* If the GP they asked for a reference to contains
2145 a method cache entry, clear it first, so that we
2146 don't infect them with our cached entry */
e7881358 2147 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2148 gp->gp_cv = NULL;
44a8e56a
PP
2149 gp->gp_cvgen = 0;
2150 }
44a8e56a 2151 }
79072805 2152 return gp;
79072805
LW
2153}
2154
2155void
864dbfa3 2156Perl_gp_free(pTHX_ GV *gv)
79072805 2157{
97aff369 2158 dVAR;
79072805 2159 GP* gp;
b0d55c99 2160 int attempts = 100;
79072805 2161
f7877b28 2162 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2163 return;
f248d071 2164 if (gp->gp_refcnt == 0) {
9b387841
NC
2165 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2166 "Attempt to free unreferenced glob pointers"
2167 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2168 return;
2169 }
748a9306
LW
2170 if (--gp->gp_refcnt > 0) {
2171 if (gp->gp_egv == gv)
2172 gp->gp_egv = 0;
c43ae56f 2173 GvGP_set(gv, NULL);
79072805 2174 return;
748a9306 2175 }
79072805 2176
b0d55c99
FC
2177 while (1) {
2178 /* Copy and null out all the glob slots, so destructors do not see
2179 freed SVs. */
2180 HEK * const file_hek = gp->gp_file_hek;
2181 SV * const sv = gp->gp_sv;
2182 AV * const av = gp->gp_av;
2183 HV * const hv = gp->gp_hv;
2184 IO * const io = gp->gp_io;
2185 CV * const cv = gp->gp_cv;
2186 CV * const form = gp->gp_form;
2187
2188 gp->gp_file_hek = NULL;
2189 gp->gp_sv = NULL;
2190 gp->gp_av = NULL;
2191 gp->gp_hv = NULL;
2192 gp->gp_io = NULL;
2193 gp->gp_cv = NULL;
2194 gp->gp_form = NULL;
2195
2196 if (file_hek)
2197 unshare_hek(file_hek);
2198
2199 SvREFCNT_dec(sv);
2200 SvREFCNT_dec(av);
2201 /* FIXME - another reference loop GV -> symtab -> GV ?
2202 Somehow gp->gp_hv can end up pointing at freed garbage. */
2203 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2204 const HEK *hvname_hek = HvNAME_HEK(hv);
103f5a36 2205 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", hvname_hek));
c2242065
BF
2206 if (PL_stashcache && hvname_hek)
2207 (void)hv_delete(PL_stashcache, HEK_KEY(hvname_hek),
2208 (HEK_UTF8(hvname_hek) ? -HEK_LEN(hvname_hek) : HEK_LEN(hvname_hek)),
2209 G_DISCARD);
b0d55c99
FC
2210 SvREFCNT_dec(hv);
2211 }
2212 SvREFCNT_dec(io);
2213 SvREFCNT_dec(cv);
2214 SvREFCNT_dec(form);
2215
2216 if (!gp->gp_file_hek
2217 && !gp->gp_sv
2218 && !gp->gp_av
2219 && !gp->gp_hv
2220 && !gp->gp_io
2221 && !gp->gp_cv
2222 && !gp->gp_form) break;
2223
2224 if (--attempts == 0) {
2225 Perl_die(aTHX_
2226 "panic: gp_free failed to free glob pointer - "
2227 "something is repeatedly re-creating entries"
2228 );
2229 }
13207a71 2230 }
748a9306 2231
79072805 2232 Safefree(gp);
c43ae56f 2233 GvGP_set(gv, NULL);
79072805
LW
2234}
2235
d460ef45
NIS
2236int
2237Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2238{
53c1dcc0
AL
2239 AMT * const amtp = (AMT*)mg->mg_ptr;
2240 PERL_UNUSED_ARG(sv);
dd374669 2241
7918f24d
NC
2242 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2243
d460ef45
NIS
2244 if (amtp && AMT_AMAGIC(amtp)) {
2245 int i;
2246 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2247 CV * const cv = amtp->table[i];
b37c2d43 2248 if (cv) {
e7881358 2249 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2250 amtp->table[i] = NULL;
d460ef45
NIS
2251 }
2252 }
2253 }
2254 return 0;
2255}
2256
a0d0e21e 2257/* Updates and caches the CV's */
c3a9a790
RGS
2258/* Returns:
2259 * 1 on success and there is some overload
2260 * 0 if there is no overload
2261 * -1 if some error occurred and it couldn't croak
2262 */
a0d0e21e 2263
c3a9a790 2264int
242f8760 2265Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2266{
97aff369 2267 dVAR;
ad64d0ec 2268 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2269 AMT amt;
9b439311 2270 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2271 U32 newgen;
a0d0e21e 2272
7918f24d
NC
2273 PERL_ARGS_ASSERT_GV_AMUPDATE;
2274
9b439311 2275 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2276 if (mg) {
2277 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2278 if (amtp->was_ok_sub == newgen) {
8c34e50d 2279 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2280 }
ad64d0ec 2281 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2282 }
a0d0e21e 2283
bfcb3514 2284 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2285
d460ef45 2286 Zero(&amt,1,AMT);
e1a479c5 2287 amt.was_ok_sub = newgen;
a6006777
PP
2288 amt.fallback = AMGfallNO;
2289 amt.flags = 0;
2290
a6006777 2291 {
8c34e50d
FC
2292 int filled = 0;
2293 int i;
a6006777 2294
3866ea3b 2295 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2296
89ffc314 2297 /* Try to find via inheritance. */
e6919483 2298 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2299 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2300 CV* cv;
89ffc314
IZ
2301
2302 if (!gv)
3866ea3b
FC
2303 {
2304 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2305 goto no_table;
3866ea3b
FC
2306 }
2307#ifdef PERL_DONT_CREATE_GVSV
2308 else if (!sv) {
6f207bd3 2309 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2310 }
2311#endif
79c9643d
JL
2312 else if (SvTRUE(sv))
2313 /* don't need to set overloading here because fallback => 1
2314 * is the default setting for classes without overloading */
89ffc314 2315 amt.fallback=AMGfallYES;
79c9643d
JL
2316 else if (SvOK(sv)) {
2317 amt.fallback=AMGfallNEVER;
386a5489 2318 filled = 1;
386a5489 2319 }
79c9643d 2320 else {
386a5489 2321 filled = 1;
386a5489 2322 }
a6006777 2323
8c34e50d 2324 for (i = 1; i < NofAMmeth; i++) {
6136c704 2325 const char * const cooky = PL_AMG_names[i];
32251b26 2326 /* Human-readable form, for debugging: */
8c34e50d 2327 const char * const cp = AMG_id2name(i);
d279ab82 2328 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2329
a0288114 2330 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2331 cp, HvNAME_get(stash)) );
611c1e95
IZ
2332 /* don't fill the cache while looking up!
2333 Creation of inheritance stubs in intermediate packages may
2334 conflict with the logic of runtime method substitution.
2335 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2336 then we could have created stubs for "(+0" in A and C too.
2337 But if B overloads "bool", we may want to use it for
2338 numifying instead of C's "+0". */
8c34e50d 2339 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2340 cv = 0;
89ffc314 2341 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC
2342 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2343 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2344 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2345 && strEQ(hvname, "overload")) {
611c1e95
IZ
2346 /* This is a hack to support autoloading..., while
2347 knowing *which* methods were declared as overloaded. */
44a8e56a 2348 /* GvSV contains the name of the method. */
6136c704 2349 GV *ngv = NULL;
c69033f2 2350 SV *gvsv = GvSV(gv);
a0288114
AL
2351
2352 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2353 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2354 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2355 if (!gvsv || !SvPOK(gvsv)
7f415459 2356 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2357 {
a0288114 2358 /* Can be an import stub (created by "can"). */
242f8760 2359 if (destructing) {
c3a9a790 2360 return -1;
242f8760
RGS
2361 }
2362 else {
d66cca07
BF
2363 const SV * const name = (gvsv && SvPOK(gvsv))
2364 ? gvsv
2365 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2366 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2367 Perl_croak(aTHX_ "%s method \"%"SVf256
2368 "\" overloading \"%s\" "\
d0c0e7dd 2369 "in package \"%"HEKf256"\"",
242f8760
RGS
2370 (GvCVGEN(gv) ? "Stub found while resolving"
2371 : "Can't resolve"),
d66cca07 2372 SVfARG(name), cp,
d0c0e7dd 2373 HEKfARG(
d66cca07 2374 HvNAME_HEK(stash)
d0c0e7dd 2375 ));
242f8760 2376 }
44a8e56a 2377 }
dc848c6f 2378 cv = GvCV(gv = ngv);
f0e9f182 2379 }
44a8e56a 2380 }
b464bac0 2381 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2382 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2383 GvNAME(CvGV(cv))) );
2384 filled = 1;
611c1e95 2385 } else if (gv) { /* Autoloaded... */
ea726b52 2386 cv = MUTABLE_CV(gv);
611c1e95 2387 filled = 1;
44a8e56a 2388 }
ea726b52 2389 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
a0d0e21e 2390 }
a0d0e21e 2391 if (filled) {
a6006777 2392 AMT_AMAGIC_on(&amt);
ad64d0ec 2393 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2394 (char*)&amt, sizeof(AMT));
8c34e50d 2395 return TRUE;
a0d0e21e
LW
2396 }
2397 }
a6006777 2398 /* Here we have no table: */
8c34e50d 2399 no_table:
a6006777 2400 AMT_AMAGIC_off(&amt);
ad64d0ec 2401 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2402 (char*)&amt, sizeof(AMTS));
c3a9a790 2403 return 0;
a0d0e21e
LW
2404}
2405
32251b26
IZ
2406
2407CV*
2408Perl_gv_handler(pTHX_ HV *stash, I32 id)
2409{
97aff369 2410 dVAR;
3f8f4626 2411 MAGIC *mg;
32251b26 2412 AMT *amtp;
e1a479c5 2413 U32 newgen;
9b439311 2414 struct mro_meta* stash_meta;
32251b26 2415
bfcb3514 2416 if (!stash || !HvNAME_get(stash))
601f1833 2417 return NULL;
e1a479c5 2418
9b439311
BB
2419 stash_meta = HvMROMETA(stash);
2420 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2421
ad64d0ec 2422 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2423 if (!mg) {
2424 do_update:
8c34e50d 2425 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2426 return NULL;
ad64d0ec 2427 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2428 }
a9fd4e40 2429 assert(mg);
32251b26 2430 amtp = (AMT*)mg->mg_ptr;
66978156 2431 if ( amtp->was_ok_sub != newgen )
32251b26 2432 goto do_update;
3ad83ce7 2433 if (AMT_AMAGIC(amtp)) {
b7787f18 2434 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2435 if (ret && isGV(ret)) { /* Autoloading stab */
2436 /* Passing it through may have resulted in a warning
2437 "Inherited AUTOLOAD for a non-method deprecated", since
2438 our caller is going through a function call, not a method call.
2439 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2440 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2441
2442 if (gv && GvCV(gv))
2443 return GvCV(gv);
2444 }
2445 return ret;
2446 }
a0288114 2447
601f1833 2448 return NULL;
32251b26
IZ
2449}
2450
2451
6f1401dc
DM
2452/* Implement tryAMAGICun_MG macro.
2453 Do get magic, then see if the stack arg is overloaded and if so call it.
2454 Flags:
2455 AMGf_set return the arg using SETs rather than assigning to
2456 the targ
2457 AMGf_numeric apply sv_2num to the stack arg.
2458*/
2459
2460bool
2461Perl_try_amagic_un(pTHX_ int method, int flags) {
2462 dVAR;
2463 dSP;
2464 SV* tmpsv;
2465 SV* const arg = TOPs;
2466
2467 SvGETMAGIC(arg);
2468
9f8bf298
NC
2469 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2470 AMGf_noright | AMGf_unary))) {
6f1401dc
DM
2471 if (flags & AMGf_set) {
2472 SETs(tmpsv);
2473 }
2474 else {
2475 dTARGET;
2476 if (SvPADMY(TARG)) {
2477 sv_setsv(TARG, tmpsv);
2478 SETTARG;
2479 }
2480 else
2481 SETs(tmpsv);
2482 }
2483 PUTBACK;
2484 return TRUE;
2485 }
2486
2487 if ((flags & AMGf_numeric) && SvROK(arg))
2488 *sp = sv_2num(arg);
2489 return FALSE;
2490}
2491
2492
2493/* Implement tryAMAGICbin_MG macro.
2494 Do get magic, then see if the two stack args are overloaded and if so
2495 call it.
2496 Flags:
2497 AMGf_set return the arg using SETs rather than assigning to
2498 the targ
2499 AMGf_assign op may be called as mutator (eg +=)
2500 AMGf_numeric apply sv_2num to the stack arg.
2501*/
2502
2503bool
2504Perl_try_amagic_bin(pTHX_ int method, int flags) {
2505 dVAR;
2506 dSP;
2507 SV* const left = TOPm1s;
2508 SV* const right = TOPs;
2509
2510 SvGETMAGIC(left);
2511 if (left != right)
2512 SvGETMAGIC(right);
2513
2514 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2515 SV * const tmpsv = amagic_call(left, right, method,
2516 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2517 if (tmpsv) {
2518 if (flags & AMGf_set) {
2519 (void)POPs;
2520 SETs(tmpsv);
2521 }
2522 else {
2523 dATARGET;
2524 (void)POPs;
2525 if (opASSIGN || SvPADMY(TARG)) {
2526 sv_setsv(TARG, tmpsv);
2527 SETTARG;
2528 }
2529 else
2530 SETs(tmpsv);
2531 }
2532 PUTBACK;
2533 return TRUE;
2534 }
2535 }
75ea7a12
FC
2536 if(left==right && SvGMAGICAL(left)) {
2537 SV * const left = sv_newmortal();
2538 *(sp-1) = left;
2539 /* Print the uninitialized warning now, so it includes the vari-
2540 able name. */
2541 if (!SvOK(right)) {
2542 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2543 sv_setsv_flags(left, &PL_sv_no, 0);
2544 }
2545 else sv_setsv_flags(left, right, 0);
2546 SvGETMAGIC(right);
2547 }
6f1401dc 2548 if (flags & AMGf_numeric) {
75ea7a12
FC
2549 if (SvROK(TOPm1s))
2550 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2551 if (SvROK(right))
2552 *sp = sv_2num(right);
2553 }
2554 return FALSE;
2555}
2556
25a9ffce
NC
2557SV *
2558Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2559 SV *tmpsv = NULL;
2560
2561 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2562
2563 while (SvAMAGIC(ref) &&
2564 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2565 AMGf_noright | AMGf_unary))) {
2566 if (!SvROK(tmpsv))
2567 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2568 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2569 /* Bail out if it returns us the same reference. */
2570 return tmpsv;
2571 }
2572 ref = tmpsv;
2573 }
2574 return tmpsv ? tmpsv : ref;
2575}
6f1401dc 2576
8d569291
FC
2577bool
2578Perl_amagic_is_enabled(pTHX_ int method)
2579{
2580 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2581
2582 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2583
2584 if ( !lex_mask || !SvOK(lex_mask) )
2585 /* overloading lexically disabled */
2586 return FALSE;
2587 else if ( lex_mask && SvPOK(lex_mask) ) {
2588 /* we have an entry in the hints hash, check if method has been
2589 * masked by overloading.pm */
2590 STRLEN len;
2591 const int offset = method / 8;
2592 const int bit = method % 8;
2593 char *pv = SvPV(lex_mask, len);
2594
2595 /* Bit set, so this overloading operator is disabled */
2596 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2597 return FALSE;
2598 }
2599 return TRUE;
2600}
2601
a0d0e21e 2602SV*
864dbfa3 2603Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2604{
27da23d5 2605 dVAR;
b267980d 2606 MAGIC *mg;
9c5ffd7c 2607 CV *cv=NULL;
a0d0e21e 2608 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2609 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2610 int off = 0, off1, lr = 0, notfound = 0;
2611 int postpr = 0, force_cpy = 0;
2612 int assign = AMGf_assign & flags;
2613 const int assignshift = assign ? 1 : 0;
bf5522a1 2614 int use_default_op = 0;
67288365 2615 int force_scalar = 0;
497b47a8
JH
2616#ifdef DEBUGGING
2617 int fl=0;
497b47a8 2618#endif
25716404 2619 HV* stash=NULL;
7918f24d
NC
2620
2621 PERL_ARGS_ASSERT_AMAGIC_CALL;
2622
e46c382e 2623 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2624 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
2625 }
2626
a0d0e21e 2627 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2628 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2629 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2630 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2631 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2632 : NULL))
b267980d 2633 && ((cv = cvp[off=method+assignshift])
748a9306
LW
2634 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2635 * usual method */
497b47a8
JH
2636 (
2637#ifdef DEBUGGING
2638 fl = 1,
a0288114 2639#endif
497b47a8 2640 cv = cvp[off=method])))) {
a0d0e21e
LW
2641 lr = -1; /* Call method for left argument */
2642 } else {
2643 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2644 int logic;
2645
2646 /* look for substituted methods */
ee239bfe 2647 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
2648 switch (method) {
2649 case inc_amg:
ee239bfe
IZ
2650 force_cpy = 1;
2651 if ((cv = cvp[off=add_ass_amg])
2652 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2653 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2654 }
2655 break;
2656 case dec_amg:
ee239bfe
IZ
2657 force_cpy = 1;
2658 if ((cv = cvp[off = subtr_ass_amg])
2659 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2660 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2661 }
2662 break;
2663 case bool__amg:
2664 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2665 break;
2666 case numer_amg:
2667 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2668 break;
2669 case string_amg:
2670 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2671 break;
b7787f18
AL
2672 case not_amg:
2673 (void)((cv = cvp[off=bool__amg])
2674 || (cv = cvp[off=numer_amg])
2675 || (cv = cvp[off=string_amg]));
2ab54efd
MB
2676 if (cv)
2677 postpr = 1;
b7787f18 2678 break;
748a9306
LW
2679 case copy_amg:
2680 {
76e3520e
GS
2681 /*
2682 * SV* ref causes confusion with the interpreter variable of
2683 * the same name
2684 */
890ce7af 2685 SV* const tmpRef=SvRV(left);
76e3520e 2686 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
2687 /*
2688 * Just to be extra cautious. Maybe in some
2689 * additional cases sv_setsv is safe, too.
2690 */
890ce7af 2691 SV* const newref = newSVsv(tmpRef);
748a9306 2692 SvOBJECT_on(newref);
a1cd65be
FC
2693 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2694 delegate to the stash. */
85fbaab2 2695 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
2696 return newref;
2697 }
2698 }
2699 break;
a0d0e21e 2700 case abs_amg:
b267980d 2701 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2702 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2703 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2704 if (off1==lt_amg) {
890ce7af 2705 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2706 lt_amg,AMGf_noright);
2707 logic = SvTRUE(lessp);
2708 } else {
890ce7af 2709 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2710 ncmp_amg,AMGf_noright);
2711 logic = (SvNV(lessp) < 0);
2712 }
2713 if (logic) {
2714 if (off==subtr_amg) {
2715 right = left;
748a9306 2716 left = nullsv;
a0d0e21e
LW
2717 lr = 1;
2718 }
2719 } else {
2720 return left;
2721 }
2722 }
2723 break;
2724 case neg_amg:
155aba94 2725 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
2726 right = left;
2727 left = sv_2mortal(newSViv(0));
2728 lr = 1;
2729 }
2730 break;
f216259d 2731 case int_amg:
f5284f61 2732 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2733 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2734 case regexp_amg:
b267980d
NIS
2735 /* FAIL safe */
2736 return NULL; /* Delegate operation to standard mechanisms. */
2737 break;
f5284f61
IZ
2738 case to_sv_amg:
2739 case to_av_amg:
2740 case to_hv_amg:
2741 case to_gv_amg:
2742 case to_cv_amg:
2743 /* FAIL safe */
b267980d 2744 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2745 break;
a0d0e21e
LW
2746 default:
2747 goto not_found;
2748 }
2749 if (!cv) goto not_found;
2750 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2751 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2752 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2753 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2754 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2755 : NULL))
69815d08
RS
2756 && (cv = cvp[off=method])) { /* Method for right
2757 * argument found */
2758 lr=1;
bf5522a1
MB
2759 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2760 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
2761 && !(flags & AMGf_unary)) {
2762 /* We look for substitution for
2763 * comparison operations and
fc36a67e 2764 * concatenation */
a0d0e21e
LW
2765 if (method==concat_amg || method==concat_ass_amg
2766 || method==repeat_amg || method==repeat_ass_amg) {
2767 return NULL; /* Delegate operation to string conversion */
2768 }
2769 off = -1;
2770 switch (method) {
2771 case lt_amg:
2772 case le_amg:
2773 case gt_amg:
2774 case ge_amg:
2775 case eq_amg:
2776 case ne_amg:
2ab54efd
MB
2777 off = ncmp_amg;
2778 break;
a0d0e21e
LW
2779 case slt_amg:
2780 case sle_amg:
2781 case sgt_amg:
2782 case sge_amg:
2783 case seq_amg:
2784 case sne_amg:
2ab54efd
MB
2785 off = scmp_amg;
2786 break;
a0d0e21e 2787 }
bf5522a1
MB
2788 if (off != -1) {
2789 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2790 cv = ocvp[off];
2791 lr = -1;
2792 }
2793 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2794 cv = cvp[off];
2795 lr = 1;
2796 }
2797 }
2798 if (cv)
2ab54efd
MB
2799 postpr = 1;
2800 else
2801 goto not_found;
a0d0e21e 2802 } else {
a6006777 2803 not_found: /* No method found, either report or croak */
b267980d
NIS
2804 switch (method) {
2805 case to_sv_amg:
2806 case to_av_amg:
2807 case to_hv_amg:
2808 case to_gv_amg:
2809 case to_cv_amg:
2810 /* FAIL safe */
2811 return left; /* Delegate operation to standard mechanisms. */
2812 break;
2813 }
a0d0e21e
LW
2814 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2815 notfound = 1; lr = -1;
2816 } else if (cvp && (cv=cvp[nomethod_amg])) {
2817 notfound = 1; lr = 1;
bf5522a1
MB
2818 } else if ((use_default_op =
2819 (!ocvp || oamtp->fallback >= AMGfallYES)
2820 && (!cvp || amtp->fallback >= AMGfallYES))
2821 && !DEBUG_o_TEST) {
4cc0ca18
NC
2822 /* Skip generating the "no method found" message. */
2823 return NULL;
a0d0e21e 2824 } else {
46fc3d4c 2825 SV *msg;
774d564b 2826 if (off==-1) off=method;
b267980d 2827 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
2828 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
2829 AMG_id2name(method + assignshift),
2830 (flags & AMGf_unary ? " " : "\n\tleft "),
2831 SvAMAGIC(left)?
2832 "in overloaded package ":
2833 "has no overloaded magic",
2834 SvAMAGIC(left)?
2835 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
2836 SVfARG(&PL_sv_no),
2837 SvAMAGIC(right)?
2838 ",\n\tright argument in overloaded package ":
2839 (flags & AMGf_unary
2840 ? ""
2841 : ",\n\tright argument has no overloaded magic"),
2842 SvAMAGIC(right)?
2843 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
2844 SVfARG(&PL_sv_no)));
bf5522a1 2845 if (use_default_op) {
d66cca07 2846 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 2847 } else {
be2597df 2848 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
2849 }
2850 return NULL;
2851 }
ee239bfe 2852 force_cpy = force_cpy || assign;
a0d0e21e
LW
2853 }
2854 }
67288365
JL
2855
2856 switch (method) {
2857 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
2858 * operation. we need this to return a value, so that it can be assigned
2859 * later on, in the postpr block (case inc_amg/dec_amg), even if the
2860 * increment or decrement was itself called in void context */
2861 case inc_amg:
2862 if (off == add_amg)
2863 force_scalar = 1;
2864 break;
2865 case dec_amg:
2866 if (off == subtr_amg)
2867 force_scalar = 1;
2868 break;
2869 /* in these cases, we're calling an assignment variant of an operator
2870 * (+= rather than +, for instance). regardless of whether it's a
2871 * fallback or not, it always has to return a value, which will be
2872 * assigned to the proper variable later */
2873 case add_amg:
2874 case subtr_amg:
2875 case mult_amg:
2876 case div_amg:
2877 case modulo_amg:
2878 case pow_amg:
2879 case lshift_amg:
2880 case rshift_amg:
2881 case repeat_amg:
2882 case concat_amg:
2883 case band_amg:
2884 case bor_amg:
2885 case bxor_amg:
2886 if (assign)
2887 force_scalar = 1;
2888 break;
2889 /* the copy constructor always needs to return a value */
2890 case copy_amg:
2891 force_scalar = 1;
2892 break;
2893 /* because of the way these are implemented (they don't perform the
2894 * dereferencing themselves, they return a reference that perl then
2895 * dereferences later), they always have to be in scalar context */
2896 case to_sv_amg:
2897 case to_av_amg:
2898 case to_hv_amg:
2899 case to_gv_amg:
2900 case to_cv_amg:
2901 force_scalar = 1;
2902 break;
2903 /* these don't have an op of their own; they're triggered by their parent
2904 * op, so the context there isn't meaningful ('$a and foo()' in void
2905 * context still needs to pass scalar context on to $a's bool overload) */
2906 case bool__amg:
2907 case numer_amg:
2908 case string_amg:
2909 force_scalar = 1;
2910 break;
2911 }
2912
497b47a8 2913#ifdef DEBUGGING
a0d0e21e 2914 if (!notfound) {
497b47a8 2915 DEBUG_o(Perl_deb(aTHX_
d66cca07 2916 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
2917 AMG_id2name(off),
2918 method+assignshift==off? "" :
a0288114 2919 " (initially \"",
497b47a8
JH
2920 method+assignshift==off? "" :
2921 AMG_id2name(method+assignshift),
a0288114 2922 method+assignshift==off? "" : "\")",
497b47a8
JH
2923 flags & AMGf_unary? "" :
2924 lr==1 ? " for right argument": " for left argument",
2925 flags & AMGf_unary? " for argument" : "",
d66cca07 2926 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 2927 fl? ",\n\tassignment variant used": "") );
ee239bfe 2928 }
497b47a8 2929#endif
748a9306
LW
2930 /* Since we use shallow copy during assignment, we need
2931 * to dublicate the contents, probably calling user-supplied
2932 * version of copy operator
2933 */
ee239bfe
IZ
2934 /* We need to copy in following cases:
2935 * a) Assignment form was called.
2936 * assignshift==1, assign==T, method + 1 == off
2937 * b) Increment or decrement, called directly.
2938 * assignshift==0, assign==0, method + 0 == off
2939 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 2940 * assignshift==0, assign==T,
ee239bfe
IZ
2941 * force_cpy == T
2942 * d) Increment or decrement, translated to nomethod.
b267980d 2943 * assignshift==0, assign==0,
ee239bfe
IZ
2944 * force_cpy == T
2945 * e) Assignment form translated to nomethod.
2946 * assignshift==1, assign==T, method + 1 != off
2947 * force_cpy == T
2948 */
2949 /* off is method, method+assignshift, or a result of opcode substitution.
2950 * In the latter case assignshift==0, so only notfound case is important.
2951 */
73512201 2952 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 2953 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 2954 || force_cpy) )
6f1401dc 2955 {
1b38c28e
NC
2956 /* newSVsv does not behave as advertised, so we copy missing
2957 * information by hand */
2958 SV *tmpRef = SvRV(left);
2959 SV *rv_copy;
31d632c3 2960 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
2961 SvRV_set(left, rv_copy);
2962 SvSETMAGIC(left);
e7881358 2963 SvREFCNT_dec_NN(tmpRef);
1b38c28e 2964 }
6f1401dc
DM
2965 }
2966
a0d0e21e
LW
2967 {
2968 dSP;
2969 BINOP myop;
2970 SV* res;
b7787f18 2971 const bool oldcatch = CATCH_GET;
67288365
JL
2972 I32 oldmark, nret;
2973 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 2974
54310121 2975 CATCH_SET(TRUE);
a0d0e21e
LW
2976 Zero(&myop, 1, BINOP);
2977 myop.op_last = (OP *) &myop;
b37c2d43 2978 myop.op_next = NULL;
67288365
JL
2979 myop.op_flags = OPf_STACKED;
2980
2981 switch (gimme) {
2982 case G_VOID:
2983 myop.op_flags |= OPf_WANT_VOID;
2984 break;
2985 case G_ARRAY:
2986 if (flags & AMGf_want_list) {
2987 myop.op_flags |= OPf_WANT_LIST;
2988 break;
2989 }
2990 /* FALLTHROUGH */
2991 default:
2992 myop.op_flags |= OPf_WANT_SCALAR;
2993 break;
2994 }
a0d0e21e 2995
e788e7d3 2996 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 2997 ENTER;
462e5cf6 2998 SAVEOP();
533c011a 2999 PL_op = (OP *) &myop;
3280af22 3000 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3001 PL_op->op_private |= OPpENTERSUB_DB;
a0d0e21e 3002 PUTBACK;
897d3989 3003 Perl_pp_pushmark(aTHX);
a0d0e21e 3004
924508f0 3005 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3006 PUSHs(lr>0? right: left);
3007 PUSHs(lr>0? left: right);
3280af22 3008 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3009 if (notfound) {
59cd0e26
NC
3010 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3011 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3012 }
ad64d0ec 3013 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3014 PUTBACK;
67288365 3015 oldmark = TOPMARK;
a0d0e21e 3016
139d0ce6 3017 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3018 CALLRUNOPS(aTHX);
a0d0e21e
LW
3019 LEAVE;
3020 SPAGAIN;
67288365
JL
3021 nret = SP - (PL_stack_base + oldmark);
3022
3023 switch (gimme) {
3024 case G_VOID:
3025 /* returning NULL has another meaning, and we check the context
3026 * at the call site too, so this can be differentiated from the
3027 * scalar case */
3028 res = &PL_sv_undef;
3029 SP = PL_stack_base + oldmark;
3030 break;
3031 case G_ARRAY: {
3032 if (flags & AMGf_want_list) {
3033 res = sv_2mortal((SV *)newAV());
3034 av_extend((AV *)res, nret);
3035 while (nret--)
3036 av_store((AV *)res, nret, POPs);
3037 break;
3038 }
3039 /* FALLTHROUGH */
3040 }
3041 default:
3042 res = POPs;
3043 break;
3044 }
a0d0e21e 3045
ebafeae7 3046 PUTBACK;
d3acc0f7 3047 POPSTACK;
54310121 3048 CATCH_SET(oldcatch);
a0d0e21e 3049
a0d0e21e 3050 if (postpr) {
b7787f18 3051 int ans;
a0d0e21e
LW
3052 switch (method) {
3053 case le_amg:
3054 case sle_amg:
3055 ans=SvIV(res)<=0; break;
3056 case lt_amg:
3057 case slt_amg:
3058 ans=SvIV(res)<0; break;
3059 case ge_amg:
3060 case sge_amg:
3061 ans=SvIV(res)>=0; break;
3062 case gt_amg:
3063 case sgt_amg:
3064 ans=SvIV(res)>0; break;
3065 case eq_amg:
3066 case seq_amg:
3067 ans=SvIV(res)==0; break;
3068 case ne_amg:
3069 case sne_amg:
3070 ans=SvIV(res)!=0; break;
3071 case inc_amg:
3072 case dec_amg:
bbce6d69 3073 SvSetSV(left,res); return left;
dc437b57 3074 case not_amg:
fe7ac86a 3075 ans=!SvTRUE(res); break;
b7787f18
AL
3076 default:
3077 ans=0; break;
a0d0e21e 3078 }
54310121 3079 return boolSV(ans);
748a9306
LW
3080 } else if (method==copy_amg) {
3081 if (!SvROK(res)) {
cea2e8a9 3082 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3083 }
3084 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3085 } else {
3086 return res;
3087 }
3088 }
3089}
c9d5ac95 3090
f5c1e807
NC
3091void
3092Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3093{
3094 dVAR;
acda4c6a 3095 U32 hash;
f5c1e807 3096
7918f24d 3097 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3098
acda4c6a
NC
3099 if (len > I32_MAX)
3100 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3101
ae8cc45f
NC
3102 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3103 unshare_hek(GvNAME_HEK(gv));
3104 }
3105
acda4c6a 3106 PERL_HASH(hash, name, len);
c60dbbc3 3107 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3108}
3109
66610fdd 3110/*
f7461760
Z
3111=for apidoc gv_try_downgrade
3112
2867cdbc
Z
3113If the typeglob C<gv> can be expressed more succinctly, by having
3114something other than a real GV in its place in the stash, replace it
3115with the optimised form. Basic requirements for this are that C<gv>
3116is a real typeglob, is sufficiently ordinary, and is only referenced
3117from its package. This function is meant to be used when a GV has been
3118looked up in part to see what was there, causing upgrading, but based
3119on what was found it turns out that the real GV isn't required after all.
3120
3121If C<gv> is a completely empty typeglob, it is deleted from the stash.
3122
3123If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3124sub, the typeglob is replaced with a scalar-reference placeholder that
3125more compactly represents the same thing.
f7461760
Z
3126
3127=cut
3128*/
3129
3130void
3131Perl_gv_try_downgrade(pTHX_ GV *gv)
3132{
3133 HV *stash;
3134 CV *cv;
3135 HEK *namehek;
3136 SV **gvp;
3137 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3138
3139 /* XXX Why and where does this leave dangling pointers during global
3140 destruction? */
627364f1 3141 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3142
2867cdbc 3143 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3144 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3145 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3146 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3147 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3148 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3149 return;
803f2748
DM
3150 if (SvMAGICAL(gv)) {
3151 MAGIC *mg;
3152 /* only backref magic is allowed */
3153 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3154 return;
3155 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3156 if (mg->mg_type != PERL_MAGIC_backref)
3157 return;
3158 }
3159 }
2867cdbc
Z
3160 cv = GvCV(gv);
3161 if (!cv) {
3162 HEK *gvnhek = GvNAME_HEK(gv);
3163 (void)hv_delete(stash, HEK_KEY(gvnhek),
3164 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
3165 } else if (GvMULTI(gv) && cv &&
f7461760
Z
3166 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3167 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3168 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3169 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3170 (namehek = GvNAME_HEK(gv)) &&
3171 (gvp = hv_fetch(stash, HEK_KEY(namehek),
3172 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
3173 *gvp == (SV*)gv) {
3174 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3175 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3176 SvREFCNT(gv) = 0;
3177 sv_clear((SV*)gv);
3178 SvREFCNT(gv) = 1;
70e5f2b5 3179 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z
3180 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3181 STRUCT_OFFSET(XPVIV, xiv_iv));
3182 SvRV_set(gv, value);
3183 }
3184}
3185
4aaa4757
FC
3186#include "XSUB.h"
3187
3188static void
3189core_xsub(pTHX_ CV* cv)
3190{
3191 Perl_croak(aTHX_
3192 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3193 );
3194}
3195
f7461760 3196/*
66610fdd
RGS
3197 * Local variables:
3198 * c-indentation-style: bsd
3199 * c-basic-offset: 4
14d04a33 3200 * indent-tabs-mode: nil
66610fdd
RGS
3201 * End:
3202 *
14d04a33 3203 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3204 */