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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
24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH
32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
8261f8eb 37#include "overload.c"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a
AL
41static const char S_autoload[] = "AUTOLOAD";
42static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 43
c69033f2 44GV *
d5713896 45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13be902c
FC
49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
54 )
55 ) {
bb85b28a
NC
56 const char *what;
57 if (type == SVt_PVIO) {
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
bb85b28a
NC
64 } else if (type == SVt_PVHV) {
65 what = "hash";
66 } else {
67 what = type == SVt_PVAV ? "array" : "scalar";
68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC
70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896
NC
72
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
bb85b28a
NC
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
d5713896
NC
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
d5713896 83 if (!*where)
e17aed30 84 {
d5713896 85 *where = newSV_type(type);
e17aed30
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);
89 }
79072805
LW
90 return gv;
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
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 132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), 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 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC
156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
6f1b3ab0 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC
159}
160
12816592
NC
161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC
166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC
180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD
184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD
187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC
192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC
198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC
202 file = "";
203 len = 0;
204 }
f4890806
NC
205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM
213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
219 GV * const oldgv = CvGV(cv);
b290562e 220 HEK *hek;
803f2748
DM
221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM
232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
db5cc3ee
FC
235 else if ((hek = CvNAME_HEK(cv))) {
236 unshare_hek(hek);
237 CvNAMED_off(cv);
f3feca7a 238 CvLEXICAL_off(cv);
db5cc3ee 239 }
803f2748 240
b290562e 241 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 242 assert(!CvCVGV_RC(cv));
803f2748
DM
243
244 if (!gv)
245 return;
246
c794ca97
DM
247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
249 else {
cfc1e951 250 CvCVGV_RC_on(cv);
803f2748
DM
251 SvREFCNT_inc_simple_void_NN(gv);
252 }
803f2748
DM
253}
254
c68d9564
Z
255/* Assign CvSTASH(cv) = st, handling weak references. */
256
257void
258Perl_cvstash_set(pTHX_ CV *cv, HV *st)
259{
260 HV *oldst = CvSTASH(cv);
261 PERL_ARGS_ASSERT_CVSTASH_SET;
262 if (oldst == st)
263 return;
264 if (oldst)
265 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
266 SvANY(cv)->xcv_stash = st;
267 if (st)
268 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
269}
803f2748 270
e1104062
FC
271/*
272=for apidoc gv_init_pvn
273
274Converts a scalar into a typeglob. This is an incoercible typeglob;
275assigning a reference to it will assign to one of its slots, instead of
276overwriting it as happens with typeglobs created by SvSetSV. Converting
277any scalar that is SvOK() may produce unpredictable results and is reserved
278for perl's internal use.
279
280C<gv> is the scalar to be converted.
281
282C<stash> is the parent stash/package, if any.
283
04ec7e59
FC
284C<name> and C<len> give the name. The name must be unqualified;
285that is, it must not include the package name. If C<gv> is a
e1104062
FC
286stash element, it is the caller's responsibility to ensure that the name
287passed to this function matches the name of the element. If it does not
288match, perl's internal bookkeeping will get out of sync.
289
04ec7e59
FC
290C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
291the return value of SvUTF8(sv). It can also take the
292GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
293seen before (i.e., suppress "Used once" warnings).
294
295=for apidoc gv_init
296
297The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
298has no flags parameter. If the C<multi> parameter is set, the
299GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
300
301=for apidoc gv_init_pv
302
303Same as gv_init_pvn(), but takes a nul-terminated string for the name
304instead of separate char * and length parameters.
305
306=for apidoc gv_init_sv
307
308Same as gv_init_pvn(), but takes an SV * for the name instead of separate
309char * and length parameters. C<flags> is currently unused.
310
311=cut
312*/
313
463ee0b2 314void
04ec7e59 315Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
316{
317 char *namepv;
318 STRLEN namelen;
319 PERL_ARGS_ASSERT_GV_INIT_SV;
320 namepv = SvPV(namesv, namelen);
321 if (SvUTF8(namesv))
322 flags |= SVf_UTF8;
04ec7e59 323 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
324}
325
326void
04ec7e59 327Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
328{
329 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 330 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
331}
332
333void
04ec7e59 334Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 335{
3b6733bf
NC
336 const U32 old_type = SvTYPE(gv);
337 const bool doproto = old_type > SVt_NULL;
f9509170 338 char * const proto = (doproto && SvPOK(gv))
dad95a0a 339 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 340 : NULL;
49a54bbe 341 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 342 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 343 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 344 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 345
e6066781 346 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
347 assert (!(proto && has_constant));
348
349 if (has_constant) {
5c1f4d79
NC
350 /* The constant has to be a simple scalar type. */
351 switch (SvTYPE(has_constant)) {
5c1f4d79
NC
352 case SVt_PVHV:
353 case SVt_PVCV:
354 case SVt_PVFM:
355 case SVt_PVIO:
356 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
357 sv_reftype(has_constant, 0));
81d52ecd 358
42d0e0b7 359 default: NOOP;
5c1f4d79 360 }
756cb477
NC
361 SvRV_set(gv, NULL);
362 SvROK_off(gv);
363 }
463ee0b2 364
3b6733bf
NC
365
366 if (old_type < SVt_PVGV) {
367 if (old_type >= SVt_PV)
368 SvCUR_set(gv, 0);
ad64d0ec 369 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 370 }
55d729e4
GS
371 if (SvLEN(gv)) {
372 if (proto) {
f880fe2f 373 SvPV_set(gv, NULL);
b162af07 374 SvLEN_set(gv, 0);
55d729e4
GS
375 SvPOK_off(gv);
376 } else
94010e71 377 Safefree(SvPVX_mutable(gv));
55d729e4 378 }
2e5b91de
NC
379 SvIOK_off(gv);
380 isGV_with_GP_on(gv);
12816592 381
c43ae56f 382 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
383 GvSTASH(gv) = stash;
384 if (stash)
ad64d0ec 385 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 386 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
387 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
388 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 389 if (doproto) {
e3d2b9e7 390 CV *cv;
756cb477
NC
391 if (has_constant) {
392 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 393 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
394 /* In case op.c:S_process_special_blocks stole it: */
395 if (!GvCV(gv))
c43ae56f 396 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 397 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
398 /* If this reference was a copy of another, then the subroutine
399 must have been "imported", by a Perl space assignment to a GV
400 from a reference to CV. */
401 if (exported_constant)
402 GvIMPORTED_CV_on(gv);
186a5ba8 403 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 404 } else {
186a5ba8 405 cv = newSTUB(gv,1);
756cb477 406 }
55d729e4 407 if (proto) {
e3d2b9e7 408 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 409 SV_HAS_TRAILING_NUL);
e0260a5b 410 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
411 }
412 }
463ee0b2
LW
413}
414
76e3520e 415STATIC void
e6066781 416S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 417{
e6066781 418 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 419
a0d0e21e
LW
420 switch (sv_type) {
421 case SVt_PVIO:
422 (void)GvIOn(gv);
423 break;
424 case SVt_PVAV:
425 (void)GvAVn(gv);
426 break;
427 case SVt_PVHV:
428 (void)GvHVn(gv);
429 break;
c69033f2
NC
430#ifdef PERL_DONT_CREATE_GVSV
431 case SVt_NULL:
432 case SVt_PVCV:
433 case SVt_PVFM:
e654831b 434 case SVt_PVGV:
c69033f2
NC
435 break;
436 default:
dbdce04c
NC
437 if(GvSVn(gv)) {
438 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
439 If we just cast GvSVn(gv) to void, it ignores evaluating it for
440 its side effect */
441 }
c69033f2 442#endif
a0d0e21e
LW
443 }
444}
445
0f8d4b5e
FC
446static void core_xsub(pTHX_ CV* cv);
447
448static GV *
449S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 450 const char * const name, const STRLEN len)
0f8d4b5e
FC
451{
452 const int code = keyword(name, len, 1);
453 static const char file[] = __FILE__;
97021f77 454 CV *cv, *oldcompcv = NULL;
0f8d4b5e 455 int opnum = 0;
0f8d4b5e 456 bool ampable = TRUE; /* &{}-able */
97021f77
FC
457 COP *oldcurcop = NULL;
458 yy_parser *oldparser = NULL;
459 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
460
461 assert(gv || stash);
462 assert(name);
0f8d4b5e 463
88b892d8
FC
464 if (!code) return NULL; /* Not a keyword */
465 switch (code < 0 ? -code : code) {
0f8d4b5e 466 /* no support for \&CORE::infix;
d885f758 467 no support for funcs that do not parse like funcs */
88b892d8 468 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 469 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 470 case KEY_default : case KEY_DESTROY:
88b892d8 471 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 472 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 473 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 474 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
475 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
476 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
477 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 478 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 479 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 480 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 481 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 482 case KEY_state: case KEY_sub :
46bef06f 483 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
484 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
485 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
486 return NULL;
487 case KEY_chdir:
eb31eb35 488 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 489 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC
490 case KEY_keys:
491 case KEY_lstat:
492 case KEY_pop:
493 case KEY_push:
494 case KEY_shift:
a99f2ca2 495 case KEY_splice: case KEY_split:
0f8d4b5e
FC
496 case KEY_stat:
497 case KEY_system:
498 case KEY_truncate: case KEY_unlink:
499 case KEY_unshift:
500 case KEY_values:
501 ampable = FALSE;
502 }
503 if (!gv) {
504 gv = (GV *)newSV(0);
505 gv_init(gv, stash, name, len, TRUE);
506 }
7e68c38b 507 GvMULTI_on(gv);
0f8d4b5e
FC
508 if (ampable) {
509 ENTER;
510 oldcurcop = PL_curcop;
511 oldparser = PL_parser;
512 lex_start(NULL, NULL, 0);
513 oldcompcv = PL_compcv;
514 PL_compcv = NULL; /* Prevent start_subparse from setting
515 CvOUTSIDE. */
516 oldsavestack_ix = start_subparse(FALSE,0);
517 cv = PL_compcv;
518 }
519 else {
520 /* Avoid calling newXS, as it calls us, and things start to
521 get hairy. */
522 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
523 GvCV_set(gv,cv);
524 GvCVGEN(gv) = 0;
0f8d4b5e
FC
525 CvISXSUB_on(cv);
526 CvXSUB(cv) = core_xsub;
527 }
528 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
529 from PL_curcop. */
530 (void)gv_fetchfile(file);
531 CvFILE(cv) = (char *)file;
532 /* XXX This is inefficient, as doing things this order causes
533 a prototype check in newATTRSUB. But we have to do
534 it this order as we need an op number before calling
535 new ATTRSUB. */
536 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 537 if (stash)
73c02f15 538 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 539 if (ampable) {
4428fb0e
TC
540#ifdef DEBUGGING
541 CV *orig_cv = cv;
542#endif
0f8d4b5e 543 CvLVALUE_on(cv);
4428fb0e
TC
544 /* newATTRSUB will free the CV and return NULL if we're still
545 compiling after a syntax error */
e8f91c91 546 if ((cv = newATTRSUB_x(
7e68c38b 547 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
548 NULL,NULL,
549 coresub_op(
550 opnum
551 ? newSVuv((UV)opnum)
552 : newSVpvn(name,len),
553 code, opnum
7e68c38b 554 ),
e8f91c91 555 TRUE
4428fb0e
TC
556 )) != NULL) {
557 assert(GvCV(gv) == orig_cv);
558 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
559 && opnum != OP_UNDEF)
560 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
561 }
0f8d4b5e
FC
562 LEAVE;
563 PL_parser = oldparser;
564 PL_curcop = oldcurcop;
565 PL_compcv = oldcompcv;
566 }
4428fb0e
TC
567 if (cv) {
568 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
569 cv_set_call_checker(
570 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
571 );
572 SvREFCNT_dec(opnumsv);
573 }
574
0f8d4b5e
FC
575 return gv;
576}
577
954c1994 578/*
6c53d59b
FC
579=for apidoc gv_fetchmeth
580
581Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
582
e6919483
BF
583=for apidoc gv_fetchmeth_sv
584
585Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
586of an SV instead of a string/length pair.
587
588=cut
589*/
590
591GV *
592Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
593{
594 char *namepv;
595 STRLEN namelen;
596 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
597 namepv = SvPV(namesv, namelen);
598 if (SvUTF8(namesv))
599 flags |= SVf_UTF8;
600 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
601}
602
603/*
604=for apidoc gv_fetchmeth_pv
605
606Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
607instead of a string/length pair.
608
609=cut
610*/
611
612GV *
613Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
614{
615 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
616 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
617}
618
619/*
620=for apidoc gv_fetchmeth_pvn
954c1994
GS
621
622Returns the glob with the given C<name> and a defined subroutine or
623C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 624accessible via @ISA and UNIVERSAL::.
954c1994
GS
625
626The argument C<level> should be either 0 or -1. If C<level==0>, as a
627side-effect creates a glob with the given C<name> in the given C<stash>
628which in the case of success contains an alias for the subroutine, and sets
e1a479c5 629up caching info for this glob.
954c1994 630
aae43805
FC
631The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
632
633GV_SUPER indicates that we want to look up the method in the superclasses
634of the C<stash>.
e6919483 635
aae43805 636The
954c1994 637GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 638visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 639the GV directly; instead, you should use the method's CV, which can be
b267980d 640obtained from the GV with the C<GvCV> macro.
954c1994
GS
641
642=cut
643*/
644
e1a479c5
BB
645/* NOTE: No support for tied ISA */
646
79072805 647GV *
e6919483 648Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 649{
463ee0b2 650 GV** gvp;
e1a479c5
BB
651 AV* linear_av;
652 SV** linear_svp;
653 SV* linear_sv;
aae43805 654 HV* cstash, *cachestash;
e1a479c5
BB
655 GV* candidate = NULL;
656 CV* cand_cv = NULL;
e1a479c5 657 GV* topgv = NULL;
bfcb3514 658 const char *hvname;
e1a479c5
BB
659 I32 create = (level >= 0) ? 1 : 0;
660 I32 items;
e1a479c5 661 U32 topgen_cmp;
04f3bf56 662 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 663
e6919483 664 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 665
af09ea45
IK
666 /* UNIVERSAL methods should be callable without a stash */
667 if (!stash) {
e1a479c5 668 create = 0; /* probably appropriate */
da51bb9b 669 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
670 return 0;
671 }
672
e1a479c5
BB
673 assert(stash);
674
bfcb3514
NC
675 hvname = HvNAME_get(stash);
676 if (!hvname)
e1a479c5 677 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 678
e1a479c5
BB
679 assert(hvname);
680 assert(name);
463ee0b2 681
aae43805
FC
682 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
683 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 684
dd69841b 685 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 686
aae43805 687 if (flags & GV_SUPER) {
1a33a059
FC
688 if (!HvAUX(stash)->xhv_mro_meta->super)
689 HvAUX(stash)->xhv_mro_meta->super = newHV();
690 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
691 }
692 else cachestash = stash;
693
e1a479c5 694 /* check locally for a real method or a cache entry */
aae43805
FC
695 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
696 create);
e1a479c5
BB
697 if(gvp) {
698 topgv = *gvp;
0f8d4b5e 699 have_gv:
e1a479c5
BB
700 assert(topgv);
701 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 702 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
703 if ((cand_cv = GvCV(topgv))) {
704 /* If genuine method or valid cache entry, use it */
705 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
706 return topgv;
707 }
708 else {
709 /* stale cache entry, junk it and move on */
e7881358 710 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
711 GvCV_set(topgv, NULL);
712 cand_cv = NULL;
e1a479c5
BB
713 GvCVGEN(topgv) = 0;
714 }
715 }
716 else if (GvCVGEN(topgv) == topgen_cmp) {
717 /* cache indicates no such method definitively */
718 return 0;
719 }
aae43805
FC
720 else if (stash == cachestash
721 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 722 && strnEQ(hvname, "CORE", 4)
87566176 723 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 724 goto have_gv;
463ee0b2 725 }
79072805 726
aae43805 727 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
728 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
729 items = AvFILLp(linear_av); /* no +1, to skip over self */
730 while (items--) {
731 linear_sv = *linear_svp++;
732 assert(linear_sv);
733 cstash = gv_stashsv(linear_sv, 0);
734
dd69841b 735 if (!cstash) {
ecad31f0 736 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 737 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 738 SVfARG(linear_sv),
d0c0e7dd 739 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
740 continue;
741 }
9607fc9c 742
e1a479c5
BB
743 assert(cstash);
744
c60dbbc3 745 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
746 if (!gvp) {
747 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
748 const char *hvname = HvNAME(cstash); assert(hvname);
749 if (strnEQ(hvname, "CORE", 4)
750 && (candidate =
87566176 751 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
752 ))
753 goto have_candidate;
754 }
755 continue;
756 }
757 else candidate = *gvp;
758 have_candidate:
e1a479c5 759 assert(candidate);
04f3bf56 760 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 761 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
762 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
763 /*
764 * Found real method, cache method in topgv if:
765 * 1. topgv has no synonyms (else inheritance crosses wires)
766 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
767 */
768 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
769 CV *old_cv = GvCV(topgv);
770 SvREFCNT_dec(old_cv);
e1a479c5 771 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 772 GvCV_set(topgv, cand_cv);
e1a479c5
BB
773 GvCVGEN(topgv) = topgen_cmp;
774 }
775 return candidate;
776 }
777 }
9607fc9c 778
e1a479c5
BB
779 /* Check UNIVERSAL without caching */
780 if(level == 0 || level == -1) {
aae43805 781 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB
782 if(candidate) {
783 cand_cv = GvCV(candidate);
784 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
785 CV *old_cv = GvCV(topgv);
786 SvREFCNT_dec(old_cv);
e1a479c5 787 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 788 GvCV_set(topgv, cand_cv);
e1a479c5
BB
789 GvCVGEN(topgv) = topgen_cmp;
790 }
791 return candidate;
792 }
793 }
794
795 if (topgv && GvREFCNT(topgv) == 1) {
796 /* cache the fact that the method is not defined */
797 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
798 }
799
79072805
LW
800 return 0;
801}
802
954c1994 803/*
460e5730
FC
804=for apidoc gv_fetchmeth_autoload
805
806This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
807parameter.
808
d21989ed 809=for apidoc gv_fetchmeth_sv_autoload
611c1e95 810
d21989ed
BF
811Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
812of an SV instead of a string/length pair.
813
814=cut
815*/
816
817GV *
818Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
819{
820 char *namepv;
821 STRLEN namelen;
822 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
823 namepv = SvPV(namesv, namelen);
824 if (SvUTF8(namesv))
825 flags |= SVf_UTF8;
826 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
827}
828
829/*
830=for apidoc gv_fetchmeth_pv_autoload
831
832Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
833instead of a string/length pair.
834
835=cut
836*/
837
838GV *
839Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
840{
841 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
842 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
843}
844
845/*
846=for apidoc gv_fetchmeth_pvn_autoload
847
848Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ
849Returns a glob for the subroutine.
850
851For an autoloaded subroutine without a GV, will create a GV even
852if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
853of the result may be zero.
854
d21989ed
BF
855Currently, the only significant value for C<flags> is SVf_UTF8.
856
611c1e95
IZ
857=cut
858*/
859
860GV *
d21989ed 861Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 862{
499321d3 863 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 864
d21989ed 865 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 866
611c1e95 867 if (!gv) {
611c1e95
IZ
868 CV *cv;
869 GV **gvp;
870
871 if (!stash)
6136c704 872 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 873 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 874 return NULL;
d21989ed 875 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 876 return NULL;
611c1e95
IZ
877 cv = GvCV(gv);
878 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 879 return NULL;
611c1e95
IZ
880 /* Have an autoload */
881 if (level < 0) /* Cannot do without a stub */
d21989ed 882 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
883 gvp = (GV**)hv_fetch(stash, name,
884 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 885 if (!gvp)
6136c704 886 return NULL;
611c1e95
IZ
887 return *gvp;
888 }
889 return gv;
890}
891
892/*
954c1994
GS
893=for apidoc gv_fetchmethod_autoload
894
895Returns the glob which contains the subroutine to call to invoke the method
896on the C<stash>. In fact in the presence of autoloading this may be the
897glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 898already setup.
954c1994
GS
899
900The third parameter of C<gv_fetchmethod_autoload> determines whether
901AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 902means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 903Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 904with a non-zero C<autoload> parameter.
954c1994 905
cec2d7b1
FC
906These functions grant C<"SUPER"> token
907as a prefix of the method name. Note
954c1994
GS
908that if you want to keep the returned glob for a long time, you need to
909check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC
910different subroutine due to $AUTOLOAD changing its value. Use the glob
911created as a side effect to do this.
954c1994 912
cec2d7b1
FC
913These functions have the same side-effects as C<gv_fetchmeth> with
914C<level==0>. The warning against passing the GV returned by
915C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS
916
917=cut
918*/
919
dc848c6f 920GV *
864dbfa3 921Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 922{
547bb267
NC
923 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
924
256d1bb2
NC
925 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
926}
927
44130a26
BF
928GV *
929Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
930{
931 char *namepv;
932 STRLEN namelen;
933 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
934 namepv = SvPV(namesv, namelen);
935 if (SvUTF8(namesv))
936 flags |= SVf_UTF8;
937 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
938}
939
940GV *
941Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
942{
943 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
944 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
945}
946
256d1bb2
NC
947/* Don't merge this yet, as it's likely to get a len parameter, and possibly
948 even a U32 hash */
949GV *
44130a26 950Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 951{
eb578fdb 952 const char *nend;
c445ea15 953 const char *nsplit = NULL;
a0d0e21e 954 GV* gv;
0dae17bd 955 HV* ostash = stash;
c94593d0 956 const char * const origname = name;
ad64d0ec 957 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
958 const U32 autoload = flags & GV_AUTOLOAD;
959 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 960 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 961
44130a26 962 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 963
eff494dd 964 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 965 stash = NULL;
c9bf4021
NC
966 else {
967 /* The only way stash can become NULL later on is if nsplit is set,
968 which in turn means that there is no need for a SVt_PVHV case
969 the error reporting code. */
970 }
b267980d 971
44130a26 972 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 973 if (*nend == '\'') {
a0d0e21e 974 nsplit = nend;
c94593d0
NC
975 name = nend + 1;
976 }
977 else if (*nend == ':' && *(nend + 1) == ':') {
978 nsplit = nend++;
979 name = nend + 1;
980 }
a0d0e21e
LW
981 }
982 if (nsplit) {
7edbdc6b 983 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 984 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
985 stash = CopSTASH(PL_curcop);
986 flags |= GV_SUPER;
cea2e8a9 987 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 988 origname, HvENAME_get(stash), name) );
4633a7c4 989 }
aae43805
FC
990 else if ((nsplit - origname) >= 7 &&
991 strnEQ(nsplit - 7, "::SUPER", 7)) {
992 /* don't autovifify if ->NoSuchStash::SUPER::method */
993 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
994 if (stash) flags |= GV_SUPER;
995 }
e189a56d 996 else {
af09ea45 997 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 998 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 999 }
0dae17bd 1000 ostash = stash;
4633a7c4
LW
1001 }
1002
14d1dfbd 1003 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1004 if (!gv) {
2f6e0fe7 1005 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1006 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1007 else if (autoload)
c8416c26
BF
1008 gv = gv_autoload_pvn(
1009 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1010 );
256d1bb2
NC
1011 if (!gv && do_croak) {
1012 /* Right now this is exclusively for the benefit of S_method_common
1013 in pp_hot.c */
1014 if (stash) {
15e6cdd9
DG
1015 /* If we can't find an IO::File method, it might be a call on
1016 * a filehandle. If IO:File has not been loaded, try to
1017 * require it first instead of croaking */
1018 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1019 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1020 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1021 STR_WITH_LEN("IO/File.pm"), 0,
1022 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1023 ) {
31b05a0f 1024 require_pv("IO/File.pm");
14d1dfbd 1025 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1026 if (gv)
1027 return gv;
1028 }
256d1bb2 1029 Perl_croak(aTHX_
b17a0679 1030 "Can't locate object method \"%"UTF8f
d0c0e7dd 1031 "\" via package \"%"HEKf"\"",
b17a0679 1032 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1033 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1034 }
1035 else {
ecad31f0 1036 SV* packnamesv;
256d1bb2 1037
256d1bb2 1038 if (nsplit) {
ecad31f0
BF
1039 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1040 SVs_TEMP | is_utf8);
256d1bb2 1041 } else {
017c5e4e 1042 packnamesv = error_report;
256d1bb2
NC
1043 }
1044
1045 Perl_croak(aTHX_
b17a0679
FC
1046 "Can't locate object method \"%"UTF8f
1047 "\" via package \"%"SVf"\""
ecad31f0 1048 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1049 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1050 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1051 }
1052 }
463ee0b2 1053 }
dc848c6f 1054 else if (autoload) {
9d4ba2ae 1055 CV* const cv = GvCV(gv);
09280a33
CS
1056 if (!CvROOT(cv) && !CvXSUB(cv)) {
1057 GV* stubgv;
1058 GV* autogv;
1059
8bfda0d7 1060 if (CvANON(cv) || !CvGV(cv))
09280a33
CS
1061 stubgv = gv;
1062 else {
1063 stubgv = CvGV(cv);
1064 if (GvCV(stubgv) != cv) /* orphaned import */
1065 stubgv = gv;
1066 }
c8416c26
BF
1067 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1068 GvNAME(stubgv), GvNAMELEN(stubgv),
1069 GV_AUTOLOAD_ISMETHOD
1070 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1071 if (autogv)
1072 gv = autogv;
1073 }
1074 }
44a8e56a
PP
1075
1076 return gv;
1077}
1078
1079GV*
0eeb01b9 1080Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1081{
1082 char *namepv;
1083 STRLEN namelen;
0fe84f7c 1084 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1085 namepv = SvPV(namesv, namelen);
1086 if (SvUTF8(namesv))
1087 flags |= SVf_UTF8;
0eeb01b9 1088 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1089}
1090
1091GV*
0eeb01b9 1092Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1093{
0fe84f7c 1094 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1095 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1096}
1097
1098GV*
0eeb01b9 1099Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1100{
44a8e56a
PP
1101 GV* gv;
1102 CV* cv;
1103 HV* varstash;
1104 GV* vargv;
1105 SV* varsv;
c8416c26
BF
1106 SV *packname = NULL;
1107 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1108
0fe84f7c 1109 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1110
7edbdc6b 1111 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1112 return NULL;
0dae17bd
GS
1113 if (stash) {
1114 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1115 STRLEN packname_len = 0;
1116 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1117 packname = newSVpvn_flags(packname_ptr, packname_len,
1118 SVs_TEMP | SvUTF8(stash));
5c284bb0 1119 stash = NULL;
0dae17bd 1120 }
c8416c26
BF
1121 else
1122 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1123 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1124 }
257dc59d
FC
1125 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1126 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1127 return NULL;
dc848c6f
PP
1128 cv = GvCV(gv);
1129
adb5a9ae 1130 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1131 return NULL;
ed850460 1132
dc848c6f
PP
1133 /*
1134 * Inheriting AUTOLOAD for non-methods works ... for now.
1135 */
0eeb01b9
FC
1136 if (
1137 !(flags & GV_AUTOLOAD_ISMETHOD)
1138 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1139 )
d1d15184 1140 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1141 "Use of inherited AUTOLOAD for non-method %"SVf
1142 "::%"UTF8f"() is deprecated",
ecad31f0 1143 SVfARG(packname),
b17a0679 1144 UTF8fARG(is_utf8, len, name));
44a8e56a 1145
aed2304a 1146 if (CvISXSUB(cv)) {
bb619f37
FC
1147 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1148 * and split that value on the last '::', pass along the same data
1149 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1150 *
1151 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1152 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1153 * type. Since SvPVX has been documented as returning the sub name
1154 * for a long time, but not as returning the prototype, we have
1155 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1156 * elsewhere.
1157 *
1158 * We put the prototype in the same allocated buffer, but after
1159 * the sub name. The SvPOK flag indicates the presence of a proto-
1160 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1161 * If both flags are on, then SvLEN is used to indicate the end of
1162 * the prototype (artificially lower than what is actually allo-
1163 * cated), at the risk of having to reallocate a few bytes unneces-
1164 * sarily--but that should happen very rarely, if ever.
1165 *
1166 * We use SvUTF8 for both prototypes and sub names, so if one is
1167 * UTF8, the other must be upgraded.
adb5a9ae 1168 */
c68d9564 1169 CvSTASH_set(cv, stash);
8fa6a409 1170 if (SvPOK(cv)) { /* Ouch! */
e7881358 1171 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1172 STRLEN ulen;
1173 const char *proto = CvPROTO(cv);
1174 assert(proto);
1175 if (SvUTF8(cv))
1176 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1177 ulen = SvCUR(tmpsv);
1178 SvCUR(tmpsv)++; /* include null in string */
1179 sv_catpvn_flags(
1180 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1181 );
1182 SvTEMP_on(tmpsv); /* Allow theft */
1183 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1184 SvTEMP_off(tmpsv);
e7881358 1185 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1186 SvLEN(cv) = SvCUR(cv) + 1;
1187 SvCUR(cv) = ulen;
1188 }
1189 else {
1190 sv_setpvn((SV *)cv, name, len);
1191 SvPOK_off(cv);
1192 if (is_utf8)
c8416c26 1193 SvUTF8_on(cv);
8fa6a409
FC
1194 else SvUTF8_off(cv);
1195 }
1196 CvAUTOLOAD_on(cv);
adb5a9ae 1197 }
adb5a9ae 1198
44a8e56a
PP
1199 /*
1200 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1201 * The subroutine's original name may not be "AUTOLOAD", so we don't
1202 * use that, but for lack of anything better we will use the sub's
1203 * original package to look up $AUTOLOAD.
1204 */
18691622 1205 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1206 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1207 ENTER;
1208
c69033f2 1209 if (!isGV(vargv)) {
04ec7e59 1210 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1211#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1212 GvSV(vargv) = newSV(0);
c69033f2
NC
1213#endif
1214 }
3d35f11b 1215 LEAVE;
e203899d 1216 varsv = GvSVn(vargv);
4bac9ae4
CS
1217 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1218 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1219 sv_setsv(varsv, packname);
396482e1 1220 sv_catpvs(varsv, "::");
d40bf27b
NC
1221 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1222 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1223 sv_catpvn_flags(
1224 varsv, name, len,
5bcd1ef4 1225 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1226 );
c8416c26
BF
1227 if (is_utf8)
1228 SvUTF8_on(varsv);
a0d0e21e
LW
1229 return gv;
1230}
1231
44a2ac75
YO
1232
1233/* require_tie_mod() internal routine for requiring a module
486ec47a 1234 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1235 *
1236 * The "gv" parameter should be the glob.
45cbc99a
RGS
1237 * "varpv" holds the name of the var, used for error messages.
1238 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1239 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1240 * are working reasonably close to as expected.
1241 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1242 * For the protection of $! to work (it is set by this routine)
1243 * the sv slot must already be magicalized.
d2c93421 1244 */
44a2ac75
YO
1245STATIC HV*
1246S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1247{
da51bb9b 1248 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1249
7918f24d
NC
1250 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1251
0ea03996 1252 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS
1253 SV *module = newSVsv(namesv);
1254 char varname = *varpv; /* varpv might be clobbered by load_module,
1255 so save it. For the moment it's always
1256 a single char. */
b82b06b8 1257 const char type = varname == '[' ? '$' : '%';
61bac25c 1258#ifdef DEBUGGING
d2c93421 1259 dSP;
61bac25c 1260#endif
d2c93421 1261 ENTER;
600beb2e 1262 SAVEFREESV(namesv);
44a2ac75 1263 if ( flags & 1 )
45cbc99a
RGS
1264 save_scalar(gv);
1265 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1266 assert(sp == PL_stack_sp);
da51bb9b 1267 stash = gv_stashsv(namesv, 0);
44a2ac75 1268 if (!stash)
b82b06b8
FC
1269 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1270 type, varname, SVfARG(namesv));
45cbc99a 1271 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC
1272 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1273 type, varname, SVfARG(namesv), methpv);
600beb2e 1274 LEAVE;
d2c93421 1275 }
e7881358 1276 else SvREFCNT_dec_NN(namesv);
44a2ac75 1277 return stash;
d2c93421
RH
1278}
1279
954c1994
GS
1280/*
1281=for apidoc gv_stashpv
1282
da51bb9b 1283Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1284determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1285
1286=cut
1287*/
1288
a0d0e21e 1289HV*
864dbfa3 1290Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1291{
7918f24d 1292 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1293 return gv_stashpvn(name, strlen(name), create);
1294}
1295
bc96cb06
SH
1296/*
1297=for apidoc gv_stashpvn
1298
da51bb9b
NC
1299Returns a pointer to the stash for a specified package. The C<namelen>
1300parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1301to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1302created if it does not already exist. If the package does not exist and
1303C<flags> is 0 (or any other setting that does not create packages) then NULL
1304is returned.
1305
566a4718
YO
1306Flags may be one of:
1307
1308 GV_ADD
1309 SVf_UTF8
1310 GV_NOADD_NOINIT
1311 GV_NOINIT
1312 GV_NOEXPAND
1313 GV_ADDMG
1314
1315The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06 1316
808724c8 1317Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1318recommended for performance reasons.
1319
bc96cb06
SH
1320=cut
1321*/
1322
0eadbdad
YO
1323/*
1324gv_stashpvn_internal
1325
1326Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1327as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1328
1329*/
1330
4e7ebec5 1331PERL_STATIC_INLINE HV*
0eadbdad 1332S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1333{
0cea0058 1334 char smallbuf[128];
46fc3d4c 1335 char *tmpbuf;
a0d0e21e
LW
1336 HV *stash;
1337 GV *tmpgv;
add0ecde 1338 U32 tmplen = namelen + 2;
dc437b57 1339
0eadbdad 1340 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1341
add0ecde 1342 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1343 tmpbuf = smallbuf;
1344 else
add0ecde
VP
1345 Newx(tmpbuf, tmplen, char);
1346 Copy(name, tmpbuf, namelen, char);
1347 tmpbuf[namelen] = ':';
1348 tmpbuf[namelen+1] = ':';
1349 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1350 if (tmpbuf != smallbuf)
1351 Safefree(tmpbuf);
a0d0e21e 1352 if (!tmpgv)
da51bb9b 1353 return NULL;
a0d0e21e 1354 stash = GvHV(tmpgv);
1f656fcf 1355 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1356 assert(stash);
1f656fcf 1357 if (!HvNAME_get(stash)) {
0be4d16f 1358 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1359
1360 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1361 /* If the containing stash has multiple effective
1362 names, see that this one gets them, too. */
1363 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1364 mro_package_moved(stash, NULL, tmpgv, 1);
1365 }
a0d0e21e 1366 return stash;
463ee0b2
LW
1367}
1368
808724c8 1369/*
1370gv_stashsvpvn_cached
1371
1372Returns a pointer to the stash for a specified package, possibly
1373cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1374
1375Requires one of either namesv or namepv to be non-null.
1376
1377See C<gv_stashpvn> for details on "flags".
1378
1379Note the sv interface is strongly preferred for performance reasons.
1380
1381*/
1382
1383#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1384 assert(namesv || name)
1385
1386PERL_STATIC_INLINE HV*
1387S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1388{
1389 HV* stash;
808724c8 1390 HE* he;
1391
1392 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1393
1394 he = (HE *)hv_common(
1395 PL_stashcache, namesv, name, namelen,
4e7ebec5 1396 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1397 );
808724c8 1398
4e7ebec5 1399 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1400 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1401
808724c8 1402 if (namesv) {
1403 if (SvOK(namesv)) { /* prevent double uninit warning */
1404 STRLEN len;
1405 name = SvPV_const(namesv, len);
1406 namelen = len;
1407 flags |= SvUTF8(namesv);
1408 } else {
1409 name = ""; namelen = 0;
1410 }
1411 }
0eadbdad
YO
1412 stash = gv_stashpvn_internal(name, namelen, flags);
1413
4e7ebec5 1414 if (stash && namelen) {
1415 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1416 (void)hv_store(PL_stashcache, name,
4e7ebec5 1417 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1418 }
808724c8 1419
4e7ebec5 1420 return stash;
1421}
1422
808724c8 1423HV*
1424Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1425{
1426 PERL_ARGS_ASSERT_GV_STASHPVN;
1427 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1428}
1429
954c1994
GS
1430/*
1431=for apidoc gv_stashsv
1432
da51bb9b 1433Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994 1434
808724c8 1435Note this interface is strongly preferred over C<gv_stashpvn> for performance reasons.
1436
954c1994
GS
1437=cut
1438*/
1439
a0d0e21e 1440HV*
da51bb9b 1441Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1442{
7918f24d 1443 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1444 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW
1445}
1446
1447
463ee0b2 1448GV *
fe9845cc 1449Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1450 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1451 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1452}
1453
1454GV *
fe9845cc 1455Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1456 STRLEN len;
77cb3b01
FC
1457 const char * const nambeg =
1458 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1459 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1460 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1461}
1462
90aeefb4 1463PERL_STATIC_INLINE void
290a1700 1464S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1465{
1466 AV* av;
1467
1468 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1469
1470 av = GvAVn(gv);
1471 GvMULTI_on(gv);
1472 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1473 NULL, 0);
ad7cce9f
FR
1474}
1475
90aeefb4
BF
1476/* This function grabs name and tries to split a stash and glob
1477 * from its contents. TODO better description, comments
1478 *
1479 * If the function returns TRUE and 'name == name_end', then
1480 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1481 */
1482PERL_STATIC_INLINE bool
1483S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1484 STRLEN *len, const char *nambeg, STRLEN full_len,
1485 const U32 is_utf8, const I32 add)
1486{
1487 const char *name_cursor;
1488 const char *const name_end = nambeg + full_len;
1489 const char *const name_em1 = name_end - 1;
1490
1491 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1492
1493 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1494 /* accidental stringify on a GV? */
1495 (*name)++;
1496 }
1497
1498 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1499 if (name_cursor < name_em1 &&
1500 ((*name_cursor == ':' && name_cursor[1] == ':')
1501 || *name_cursor == '\''))
1502 {
1503 if (!*stash)
1504 *stash = PL_defstash;
1505 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1506 return FALSE;
1507
1508 *len = name_cursor - *name;
1509 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1510 const char *key;
1511 GV**gvp;
1512 if (*name_cursor == ':') {
1513 key = *name;
1514 *len += 2;
1515 }
1516 else {
1517 char *tmpbuf;
1518 Newx(tmpbuf, *len+2, char);
1519 Copy(*name, tmpbuf, *len, char);
1520 tmpbuf[(*len)++] = ':';
1521 tmpbuf[(*len)++] = ':';
1522 key = tmpbuf;
1523 }
c161da64 1524 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF
1525 *gv = gvp ? *gvp : NULL;
1526 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1527 if (SvTYPE(*gv) != SVt_PVGV)
1528 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1529 else
1530 GvMULTI_on(*gv);
1531 }
1532 if (key != *name)
1533 Safefree(key);
1534 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1535 return FALSE;
1536
1537 if (!(*stash = GvHV(*gv))) {
1538 *stash = GvHV(*gv) = newHV();
1539 if (!HvNAME_get(*stash)) {
1540 if (GvSTASH(*gv) == PL_defstash && *len == 6
1541 && strnEQ(*name, "CORE", 4))
1542 hv_name_set(*stash, "CORE", 4, 0);
1543 else
1544 hv_name_set(
1545 *stash, nambeg, name_cursor-nambeg, is_utf8
1546 );
1547 /* If the containing stash has multiple effective
1548 names, see that this one gets them, too. */
1549 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1550 mro_package_moved(*stash, NULL, *gv, 1);
1551 }
1552 }
1553 else if (!HvNAME_get(*stash))
1554 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1555 }
1556
1557 if (*name_cursor == ':')
1558 name_cursor++;
1559 *name = name_cursor+1;
1560 if (*name == name_end) {
1561 if (!*gv)
1562 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1563 return TRUE;
1564 }
1565 }
1566 }
1567 *len = name_cursor - *name;
1568 return TRUE;
1569}
1570
536d1a88 1571/* Checks if an unqualified name is in the main stash */
90aeefb4 1572PERL_STATIC_INLINE bool
536d1a88 1573S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1574{
536d1a88 1575 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1576
90aeefb4 1577 /* If it's an alphanumeric variable */
536d1a88 1578 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF
1579 /* Some "normal" variables are always in main::,
1580 * like INC or STDOUT.
1581 */
1582 switch (len) {
1583 case 1:
1584 if (*name == '_')
536d1a88 1585 return TRUE;
90aeefb4
BF
1586 break;
1587 case 3:
1588 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1589 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1590 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1591 return TRUE;
90aeefb4
BF
1592 break;
1593 case 4:
1594 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1595 && name[3] == 'V')
536d1a88 1596 return TRUE;
90aeefb4
BF
1597 break;
1598 case 5:
1599 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1600 && name[3] == 'I' && name[4] == 'N')
536d1a88 1601 return TRUE;
90aeefb4
BF
1602 break;
1603 case 6:
1604 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1605 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1606 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1607 return TRUE;
90aeefb4
BF
1608 break;
1609 case 7:
1610 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1611 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1612 && name[6] == 'T')
536d1a88 1613 return TRUE;
90aeefb4
BF
1614 break;
1615 }
536d1a88
BF
1616 }
1617 /* *{""}, or a special variable like $@ */
1618 else
1619 return TRUE;
1620
1621 return FALSE;
1622}
1623
1624
1625/* This function is called if parse_gv_stash_name() failed to
1626 * find a stash, or if GV_NOTQUAL or an empty name was passed
1627 * to gv_fetchpvn_flags.
1628 *
1629 * It returns FALSE if the default stash can't be found nor created,
1630 * which might happen during global destruction.
1631 */
1632PERL_STATIC_INLINE bool
1633S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1634 const U32 is_utf8, const I32 add,
1635 const svtype sv_type)
1636{
1637 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1638
1639 /* No stash in name, so see how we can default */
90aeefb4 1640
536d1a88
BF
1641 if ( gv_is_in_main(name, len, is_utf8) ) {
1642 *stash = PL_defstash;
1643 }
1644 else {
1645 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1646 *stash = PL_curstash;
1647 if (add && (PL_hints & HINT_STRICT_VARS) &&
1648 sv_type != SVt_PVCV &&
1649 sv_type != SVt_PVGV &&
1650 sv_type != SVt_PVFM &&
1651 sv_type != SVt_PVIO &&
1652 !(len == 1 && sv_type == SVt_PV &&
1653 (*name == 'a' || *name == 'b')) )
1654 {
c161da64 1655 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF
1656 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1657 SvTYPE(*gvp) != SVt_PVGV)
1658 {
1659 *stash = NULL;
1660 }
1661 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1662 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1663 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1664 {
1665 /* diag_listed_as: Variable "%s" is not imported%s */
1666 Perl_ck_warner_d(
1667 aTHX_ packWARN(WARN_MISC),
1668 "Variable \"%c%"UTF8f"\" is not imported",
1669 sv_type == SVt_PVAV ? '@' :
1670 sv_type == SVt_PVHV ? '%' : '$',
1671 UTF8fARG(is_utf8, len, name));
1672 if (GvCVu(*gvp))
1673 Perl_ck_warner_d(
1674 aTHX_ packWARN(WARN_MISC),
1675 "\t(Did you mean &%"UTF8f" instead?)\n",
1676 UTF8fARG(is_utf8, len, name)
1677 );
1678 *stash = NULL;
1679 }
1680 }
1681 }
1682 else {
1683 /* Use the current op's stash */
1684 *stash = CopSTASH(PL_curcop);
1685 }
1686 }
90aeefb4
BF
1687
1688 if (!*stash) {
1689 if (add && !PL_in_clean_all) {
1690 SV * const err = Perl_mess(aTHX_
1691 "Global symbol \"%s%"UTF8f
1692 "\" requires explicit package name",
1693 (sv_type == SVt_PV ? "$"
1694 : sv_type == SVt_PVAV ? "@"
1695 : sv_type == SVt_PVHV ? "%"
1696 : ""), UTF8fARG(is_utf8, len, name));
1697 GV *gv;
1698 if (is_utf8)
1699 SvUTF8_on(err);
1700 qerror(err);
cd164bf8
BF
1701 /* To maintain the output of errors after the strict exception
1702 * above, and to keep compat with older releases, rather than
1703 * placing the variables in the pad, we place
1704 * them in the <none>:: stash.
1705 */
90aeefb4
BF
1706 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1707 if (!gv) {
1708 /* symbol table under destruction */
1709 return FALSE;
1710 }
1711 *stash = GvHV(gv);
1712 }
1713 else
1714 return FALSE;
1715 }
1716
1717 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1718 return FALSE;
1719
1720 return TRUE;
1721}
1722
930867a8
BF
1723/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1724 * a new GV.
1725 * Note that it does not insert the GV into the stash prior to
1726 * magicalization, which some variables require need in order
1727 * to work (like $[, %+, %-, %!), so callers must take care of
1728 * that beforehand.
1729 *
1730 * The return value has a specific meaning for gv_fetchpvn_flags:
1731 * If it returns true, and the gv is empty, it indicates that its
1732 * refcount should be decreased.
1733 */
1734PERL_STATIC_INLINE bool
1735S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1736 bool addmg, const svtype sv_type)
79072805 1737{
960b831f 1738 SSize_t paren;
79072805 1739
930867a8 1740 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1741
44428a46 1742 if (stash != PL_defstash) { /* not the main stash */
ea238638 1743 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC
1744 and VERSION. All the others apply only to the main stash or to
1745 CORE (which is checked right after this). */
ea238638 1746 if (len) {
b464bac0 1747 const char * const name2 = name + 1;
cc4c2da6 1748 switch (*name) {
cc4c2da6
NC
1749 case 'E':
1750 if (strnEQ(name2, "XPORT", 5))
1751 GvMULTI_on(gv);
1752 break;
1753 case 'I':
44428a46 1754 if (strEQ(name2, "SA"))
290a1700 1755 gv_magicalize_isa(gv);
cc4c2da6 1756 break;
44428a46
FC
1757 case 'V':
1758 if (strEQ(name2, "ERSION"))
1759 GvMULTI_on(gv);
1760 break;
ea238638
FC
1761 case 'a':
1762 case 'b':
1763 if (len == 1 && sv_type == SVt_PV)
1764 GvMULTI_on(gv);
924ba076 1765 /* FALLTHROUGH */
4aaa4757
FC
1766 default:
1767 goto try_core;
1768 }
930867a8 1769 return addmg;
4aaa4757
FC
1770 }
1771 try_core:
1772 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1773 /* Avoid null warning: */
1774 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1775 if (strnEQ(stashname, "CORE", 4))
1776 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1777 }
1778 }
1779 else if (len > 1) {
1780#ifndef EBCDIC
1781 if (*name > 'V' ) {
1782 NOOP;
1783 /* Nothing else to do.
1784 The compiler will probably turn the switch statement into a
1785 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1786 the common case of lower case variable names. (On EBCDIC
1787 platforms, we can't just do:
1788 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1789 because cases like '\027' in the switch statement below are
1790 C1 (non-ASCII) controls on those platforms, so the remapping
1791 would make them larger than 'V')
1792 */
44428a46
FC
1793 } else
1794#endif
1795 {
1796 const char * const name2 = name + 1;
1797 switch (*name) {
1798 case 'A':
1799 if (strEQ(name2, "RGV")) {
1800 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1801 }
1802 else if (strEQ(name2, "RGVOUT")) {
1803 GvMULTI_on(gv);
1804 }
1805 break;
1806 case 'E':
1807 if (strnEQ(name2, "XPORT", 5))
1808 GvMULTI_on(gv);
1809 break;
1810 case 'I':
1811 if (strEQ(name2, "SA")) {
290a1700 1812 gv_magicalize_isa(gv);
44428a46
FC
1813 }
1814 break;
cc4c2da6
NC
1815 case 'S':
1816 if (strEQ(name2, "IG")) {
1817 HV *hv;
1818 I32 i;
d525a7b2
NC
1819 if (!PL_psig_name) {
1820 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1821 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1822 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1823 } else {
1824 /* I think that the only way to get here is to re-use an
1825 embedded perl interpreter, where the previous
1826 use didn't clean up fully because
1827 PL_perl_destruct_level was 0. I'm not sure that we
1828 "support" that, in that I suspect in that scenario
1829 there are sufficient other garbage values left in the
1830 interpreter structure that something else will crash
1831 before we get here. I suspect that this is one of
1832 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1833 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1834 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1835 }
1836 GvMULTI_on(gv);
1837 hv = GvHVn(gv);
a0714e2c 1838 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1839 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1840 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1841 if (init)
1842 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1843 }
1844 }
1845 break;
1846 case 'V':
1847 if (strEQ(name2, "ERSION"))
1848 GvMULTI_on(gv);
1849 break;
e5218da5
GA
1850 case '\003': /* $^CHILD_ERROR_NATIVE */
1851 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1852 goto magicalize;
1853 break;
cc4c2da6
NC
1854 case '\005': /* $^ENCODING */
1855 if (strEQ(name2, "NCODING"))
1856 goto magicalize;
1857 break;
9ebf26ad
FR
1858 case '\007': /* $^GLOBAL_PHASE */
1859 if (strEQ(name2, "LOBAL_PHASE"))
1860 goto ro_magicalize;
1861 break;
8561ea1d
FC
1862 case '\014': /* $^LAST_FH */
1863 if (strEQ(name2, "AST_FH"))
1864 goto ro_magicalize;
1865 break;
cde0cee5 1866 case '\015': /* $^MATCH */
960b831f
NC
1867 if (strEQ(name2, "ATCH")) {
1868 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1869 goto storeparen;
1870 }
66230c86 1871 break;
cc4c2da6
NC
1872 case '\017': /* $^OPEN */
1873 if (strEQ(name2, "PEN"))
1874 goto magicalize;
1875 break;
cde0cee5 1876 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC
1877 if (strEQ(name2, "REMATCH")) {
1878 paren = RX_BUFF_IDX_CARET_PREMATCH;
1879 goto storeparen;
1880 }
1881 if (strEQ(name2, "OSTMATCH")) {
1882 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1883 goto storeparen;
1884 }
9ebf26ad 1885 break;
cc4c2da6
NC
1886 case '\024': /* ${^TAINT} */
1887 if (strEQ(name2, "AINT"))
1888 goto ro_magicalize;
1889 break;
7cebcbc0 1890 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1891 if (strEQ(name2, "NICODE"))
cc4c2da6 1892 goto ro_magicalize;
a0288114 1893 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1894 goto ro_magicalize;
e07ea26a
NC
1895 if (strEQ(name2, "TF8CACHE"))
1896 goto magicalize;
cc4c2da6
NC
1897 break;
1898 case '\027': /* $^WARNING_BITS */
1899 if (strEQ(name2, "ARNING_BITS"))
1900 goto magicalize;
1901 break;
1902 case '1':
1903 case '2':
1904 case '3':
1905 case '4':
1906 case '5':
1907 case '6':
1908 case '7':
1909 case '8':
1910 case '9':
85e6fe83 1911 {
2fdbfb4d
AB
1912 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1913 this test */
1914 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC
1915 const char *end = name + len;
1916 while (--end > name) {
930867a8
BF
1917 if (!isDIGIT(*end))
1918 return addmg;
cc4c2da6 1919 }
99944878 1920 paren = grok_atou(name, NULL);
960b831f 1921 goto storeparen;
1d7c1841 1922 }
dc437b57 1923 }
93a17b20 1924 }
392db708
NC
1925 } else {
1926 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1927 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1928 switch (*name) {
6361f656 1929 case '&': /* $& */
960b831f
NC
1930 paren = RX_BUFF_IDX_FULLMATCH;
1931 goto sawampersand;
6361f656 1932 case '`': /* $` */
960b831f
NC
1933 paren = RX_BUFF_IDX_PREMATCH;
1934 goto sawampersand;
6361f656 1935 case '\'': /* $' */
960b831f
NC
1936 paren = RX_BUFF_IDX_POSTMATCH;
1937 sawampersand:
1a904fc8 1938#ifdef PERL_SAWAMPERSAND
a289ef89 1939 if (!(
cc4c2da6
NC
1940 sv_type == SVt_PVAV ||
1941 sv_type == SVt_PVHV ||
1942 sv_type == SVt_PVCV ||
1943 sv_type == SVt_PVFM ||
1944 sv_type == SVt_PVIO
d3b97530
DM
1945 )) { PL_sawampersand |=
1946 (*name == '`')
1947 ? SAWAMPERSAND_LEFT
1948 : (*name == '&')
1949 ? SAWAMPERSAND_MIDDLE
1950 : SAWAMPERSAND_RIGHT;
1951 }
1a904fc8 1952#endif
960b831f 1953 goto storeparen;
e91d8259
NC
1954 case '1': /* $1 */
1955 case '2': /* $2 */
1956 case '3': /* $3 */
1957 case '4': /* $4 */
1958 case '5': /* $5 */
1959 case '6': /* $6 */
1960 case '7': /* $7 */
1961 case '8': /* $8 */
1962 case '9': /* $9 */
960b831f
NC
1963 paren = *name - '0';
1964
1965 storeparen:
e91d8259
NC
1966 /* Flag the capture variables with a NULL mg_ptr
1967 Use mg_len for the array index to lookup. */
960b831f 1968 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1969 break;
cc4c2da6 1970
6361f656 1971 case ':': /* $: */
c69033f2 1972 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
1973 goto magicalize;
1974
6361f656 1975 case '?': /* $? */
ff0cee69 1976#ifdef COMPLEX_STATUS
c69033f2 1977 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1978#endif
cc4c2da6 1979 goto magicalize;
ff0cee69 1980
6361f656 1981 case '!': /* $! */
67261566 1982 GvMULTI_on(gv);
44a2ac75 1983 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1984
ad64d0ec 1985 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1986
44a2ac75 1987 /* magicalization must be done before require_tie_mod is called */
67261566 1988 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 1989 {
44a2ac75 1990 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 1991 addmg = FALSE;
ffdb8bcd 1992 }
d2c93421 1993
6cef1e77 1994 break;
6361f656
AB
1995 case '-': /* $- */
1996 case '+': /* $+ */
44a2ac75
YO
1997 GvMULTI_on(gv); /* no used once warnings here */
1998 {
44a2ac75 1999 AV* const av = GvAVn(gv);
ad64d0ec 2000 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2001
ad64d0ec
NC
2002 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2003 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2004 if (avc)
44a2ac75 2005 SvREADONLY_on(GvSVn(gv));
44a2ac75 2006 SvREADONLY_on(av);
67261566
YO
2007
2008 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2009 {
192b9cd1 2010 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2011 addmg = FALSE;
213084e4 2012 }
67261566 2013
80305961 2014 break;
cc4c2da6 2015 }
6361f656
AB
2016 case '*': /* $* */
2017 case '#': /* $# */
9b387841 2018 if (sv_type == SVt_PV)
4f650b80 2019 /* diag_listed_as: $* is no longer supported */
9b387841 2020 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2021 "$%c is no longer supported", *name);
8ae1fe26 2022 break;
b3ca2e83
NC
2023 case '\010': /* $^H */
2024 {
2025 HV *const hv = GvHVn(gv);
2026 hv_magic(hv, NULL, PERL_MAGIC_hints);
2027 }
2028 goto magicalize;
b82b06b8 2029 case '[': /* $[ */
7d69d4a6 2030 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2031 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2032 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2033 addmg = FALSE;
b82b06b8 2034 }
7d69d4a6 2035 else goto magicalize;
b82b06b8 2036 break;
cc4c2da6 2037 case '\023': /* $^S */
2fdbfb4d
AB
2038 ro_magicalize:
2039 SvREADONLY_on(GvSVn(gv));
924ba076 2040 /* FALLTHROUGH */
6361f656 2041 case '0': /* $0 */
6361f656
AB
2042 case '^': /* $^ */
2043 case '~': /* $~ */
2044 case '=': /* $= */
2045 case '%': /* $% */
2046 case '.': /* $. */
2047 case '(': /* $( */
2048 case ')': /* $) */
2049 case '<': /* $< */
2050 case '>': /* $> */
2051 case '\\': /* $\ */
2052 case '/': /* $/ */
4505a31f 2053 case '|': /* $| */
9cdac2a2 2054 case '$': /* $$ */
cc4c2da6
NC
2055 case '\001': /* $^A */
2056 case '\003': /* $^C */
2057 case '\004': /* $^D */
2058 case '\005': /* $^E */
2059 case '\006': /* $^F */
cc4c2da6
NC
2060 case '\011': /* $^I, NOT \t in EBCDIC */
2061 case '\016': /* $^N */
2062 case '\017': /* $^O */
2063 case '\020': /* $^P */
2064 case '\024': /* $^T */
2065 case '\027': /* $^W */
2066 magicalize:
ad64d0ec 2067 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2068 break;
e521374c 2069
cc4c2da6 2070 case '\014': /* $^L */
76f68e9b 2071 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2072 break;
6361f656 2073 case ';': /* $; */
76f68e9b 2074 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2075 break;
6361f656 2076 case ']': /* $] */
cc4c2da6 2077 {
3638bf15 2078 SV * const sv = GvSV(gv);
d7aa5382 2079 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2080 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2081 GvSV(gv) = vnumify(PL_patchlevel);
2082 SvREADONLY_on(GvSV(gv));
2083 SvREFCNT_dec(sv);
93a17b20
LW
2084 }
2085 break;
cc4c2da6
NC
2086 case '\026': /* $^V */
2087 {
3638bf15 2088 SV * const sv = GvSV(gv);
f9be5ac8
DM
2089 GvSV(gv) = new_version(PL_patchlevel);
2090 SvREADONLY_on(GvSV(gv));
2091 SvREFCNT_dec(sv);
16070b82
GS
2092 }
2093 break;
ea238638
FC
2094 case 'a':
2095 case 'b':
dc3e91f6 2096 if (sv_type == SVt_PV)
ea238638 2097 GvMULTI_on(gv);
cc4c2da6 2098 }
79072805 2099 }
930867a8
BF
2100
2101 return addmg;
71c35c05
BF
2102}
2103
070dc475
BF
2104/* This function is called when the stash already holds the GV of the magic
2105 * variable we're looking for, but we need to check that it has the correct
2106 * kind of magic. For example, if someone first uses $! and then %!, the
2107 * latter would end up here, and we add the Errno tie to the HASH slot of
2108 * the *! glob.
2109 */
2110PERL_STATIC_INLINE void
2111S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2112{
2113 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2114
2115 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2116 if (*name == '!')
2117 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2118 else if (*name == '-' || *name == '+')
2119 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2120 } else if (sv_type == SVt_PV) {
2121 if (*name == '*' || *name == '#') {
2122 /* diag_listed_as: $* is no longer supported */
2123 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2124 WARN_SYNTAX),
2125 "$%c is no longer supported", *name);
2126 }
2127 }
2128 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2129 switch (*name) {
2130 case '[':
2131 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2132 break;
2133#ifdef PERL_SAWAMPERSAND
2134 case '`':
2135 PL_sawampersand |= SAWAMPERSAND_LEFT;
2136 (void)GvSVn(gv);
2137 break;
2138 case '&':
2139 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2140 (void)GvSVn(gv);
2141 break;
2142 case '\'':
2143 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2144 (void)GvSVn(gv);
2145 break;
2146#endif
2147 }
2148 }
2149}
2150
71c35c05
BF
2151GV *
2152Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2153 const svtype sv_type)
2154{
71c35c05
BF
2155 const char *name = nambeg;
2156 GV *gv = NULL;
2157 GV**gvp;
2158 STRLEN len;
2159 HV *stash = NULL;
2160 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2161 const I32 no_expand = flags & GV_NOEXPAND;
2162 const I32 add = flags & ~GV_NOADD_MASK;
2163 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2164 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2165 const char *const name_end = nambeg + full_len;
2166 U32 faking_it;
2167
2168 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2169
2170 /* If we have GV_NOTQUAL, the caller promised that
2171 * there is no stash, so we can skip the check.
2172 * Similarly if full_len is 0, since then we're
2173 * dealing with something like *{""} or ""->foo()
2174 */
2175 if ((flags & GV_NOTQUAL) || !full_len) {
2176 len = full_len;
2177 }
2178 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2179 if (name == name_end) return gv;
2180 }
2181 else {
2182 return NULL;
2183 }
2184
2185 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2186 return NULL;
2187 }
2188
2189 /* By this point we should have a stash and a name */
c161da64 2190 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF
2191 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2192 if (addmg) gv = (GV *)newSV(0);
2193 else return NULL;
2194 }
2195 else gv = *gvp, addmg = 0;
2196 /* From this point on, addmg means gv has not been inserted in the
2197 symtab yet. */
2198
2199 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2200 /* The GV already exists, so return it, but check if we need to do
2201 * anything else with it before that.
2202 */
71c35c05 2203 if (add) {
c002ae9a
BF
2204 /* This is the heuristic that handles if a variable triggers the
2205 * 'used only once' warning. If there's already a GV in the stash
2206 * with this name, then we assume that the variable has been used
2207 * before and turn its MULTI flag on.
2208 * It's a heuristic because it can easily be "tricked", like with
2209 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2210 * not warning about $main::foo being used just once
2211 */
71c35c05
BF
2212 GvMULTI_on(gv);
2213 gv_init_svtype(gv, sv_type);
2214 /* You reach this path once the typeglob has already been created,
2215 either by the same or a different sigil. If this path didn't
2216 exist, then (say) referencing $! first, and %! second would
2217 mean that %! was not handled correctly. */
2218 if (len == 1 && stash == PL_defstash) {
070dc475 2219 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2220 }
2221 else if (len == 3 && sv_type == SVt_PVAV
2222 && strnEQ(name, "ISA", 3)
2223 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2224 gv_magicalize_isa(gv);
2225 }
2226 return gv;
2227 } else if (no_init) {
2228 assert(!addmg);
2229 return gv;
c002ae9a
BF
2230 }
2231 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2232 * don't expand it to a glob. This is an optimization so that things
2233 * copying constants over, like Exporter, don't have to be rewritten
2234 * to take into account that you can store more than just globs in
2235 * stashes.
2236 */
2237 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2238 assert(!addmg);
2239 return gv;
2240 }
2241
2242 /* Adding a new symbol.
2243 Unless of course there was already something non-GV here, in which case
2244 we want to behave as if there was always a GV here, containing some sort
2245 of subroutine.
2246 Otherwise we run the risk of creating things like GvIO, which can cause
2247 subtle bugs. eg the one that tripped up SQL::Translator */
2248
2249 faking_it = SvOK(gv);
2250
2251 if (add & GV_ADDWARN)
2252 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2253 "Had to create %"UTF8f" unexpectedly",
2254 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2255 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2256
9e5de6ae 2257 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF
2258 GvMULTI_on(gv) ;
2259
930867a8
BF
2260 /* First, store the gv in the symtab if we're adding magic,
2261 * but only for non-empty GVs
2262 */
2263#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2264 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2265
2266 if ( addmg && !GvEMPTY(gv) ) {
2267 (void)hv_store(stash,name,len,(SV *)gv,0);
2268 }
2269
71c35c05 2270 /* set up magic where warranted */
930867a8
BF
2271 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2272 /* See 23496c6 */
2273 if (GvEMPTY(gv)) {
2274 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2275 /* The GV was and still is "empty", except that now
2276 * it has the magic flags turned on, so we want it
2277 * stored in the symtab.
2278 */
2279 (void)hv_store(stash,name,len,(SV *)gv,0);
2280 }
2281 else {
2282 /* Most likely the temporary GV created above */
2283 SvREFCNT_dec_NN(gv);
2284 gv = NULL;
2285 }
2286 }
2287 }
71c35c05 2288
e6066781 2289 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2290 return gv;
79072805
LW
2291}
2292
2293void
35a4481c 2294Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2295{
ed60a868 2296 const char *name;
35a4481c 2297 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2298
2299 PERL_ARGS_ASSERT_GV_FULLNAME4;
2300
666ea192 2301 sv_setpv(sv, prefix ? prefix : "");
a0288114 2302
52a6327b 2303 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2304 const STRLEN len = HvNAMELEN(hv);
2305 if (keepmain || strnNE(name, "main", len)) {
2306 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2307 sv_catpvs(sv,"::");
ed60a868 2308 }
43693395 2309 }
ed60a868 2310 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2311 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2312}
2313
2314void
35a4481c 2315Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2316{
099be4f1 2317 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2318
2319 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2320
46c461b5 2321 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2322}
2323
39a65960
DM
2324
2325/* recursively scan a stash and any nested stashes looking for entries
2326 * that need the "only used once" warning raised
2327 */
2328
79072805 2329void
51da40ed 2330Perl_gv_check(pTHX_ HV *stash)
79072805 2331{
eb578fdb 2332 I32 i;
463ee0b2 2333
7918f24d
NC
2334 PERL_ARGS_ASSERT_GV_CHECK;
2335
8990e307
LW
2336 if (!HvARRAY(stash))
2337 return;
90754377
DM
2338
2339 assert(SvOOK(stash));
90754377 2340
a0d0e21e 2341 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2342 const HE *entry;
90754377 2343 /* mark stash is being scanned, to avoid recursing */
339441ef 2344 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2345 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2346 GV *gv;
b7787f18 2347 HV *hv;
dc437b57 2348 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2349 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2350 {
90754377
DM
2351 if (hv != PL_defstash && hv != stash
2352 && !(SvOOK(hv)
2353 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2354 )
a0d0e21e
LW
2355 gv_check(hv); /* nested package */
2356 }
ecad31f0
BF
2357 else if ( *HeKEY(entry) != '_'
2358 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2359 const char *file;
159b6efe 2360 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2361 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2362 continue;
1d7c1841 2363 file = GvFILE(gv);
1d7c1841 2364 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2365#ifdef USE_ITHREADS
2366 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2367#else
2368 CopFILEGV(PL_curcop)
2369 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2370#endif
9014280d 2371 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2372 "Name \"%"HEKf"::%"HEKf
2373 "\" used only once: possible typo",
2374 HEKfARG(HvNAME_HEK(stash)),
2375 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2376 }
79072805 2377 }
339441ef 2378 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW
2379 }
2380}
2381
2382GV *
9cc50d5b 2383Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2384{
9cc50d5b 2385 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2386 assert(!(flags & ~SVf_UTF8));
7918f24d 2387
b17a0679
FC
2388 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2389 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2390 (long)PL_gensym++),
2391 GV_ADD, SVt_PVGV);
79072805
LW
2392}
2393
2394/* hopefully this is only called on local symbol table entries */
2395
2396GP*
864dbfa3 2397Perl_gp_ref(pTHX_ GP *gp)
79072805 2398{
1d7c1841 2399 if (!gp)
d4c19fe8 2400 return NULL;
79072805 2401 gp->gp_refcnt++;
44a8e56a
PP
2402 if (gp->gp_cv) {
2403 if (gp->gp_cvgen) {
e1a479c5
BB
2404 /* If the GP they asked for a reference to contains
2405 a method cache entry, clear it first, so that we
2406 don't infect them with our cached entry */
e7881358 2407 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2408 gp->gp_cv = NULL;
44a8e56a
PP
2409 gp->gp_cvgen = 0;
2410 }
44a8e56a 2411 }
79072805 2412 return gp;
79072805
LW
2413}
2414
2415void
864dbfa3 2416Perl_gp_free(pTHX_ GV *gv)
79072805 2417{
79072805 2418 GP* gp;
b0d55c99 2419 int attempts = 100;
79072805 2420
f7877b28 2421 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2422 return;
f248d071 2423 if (gp->gp_refcnt == 0) {
9b387841
NC
2424 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2425 "Attempt to free unreferenced glob pointers"
2426 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2427 return;
2428 }
4571f4a7 2429 if (gp->gp_refcnt > 1) {
bc81b34d 2430 borrowed:
748a9306
LW
2431 if (gp->gp_egv == gv)
2432 gp->gp_egv = 0;
4571f4a7 2433 gp->gp_refcnt--;
c43ae56f 2434 GvGP_set(gv, NULL);
79072805 2435 return;
748a9306 2436 }
79072805 2437
b0d55c99
FC
2438 while (1) {
2439 /* Copy and null out all the glob slots, so destructors do not see
2440 freed SVs. */
2441 HEK * const file_hek = gp->gp_file_hek;
2442 SV * const sv = gp->gp_sv;
2443 AV * const av = gp->gp_av;
2444 HV * const hv = gp->gp_hv;
2445 IO * const io = gp->gp_io;
2446 CV * const cv = gp->gp_cv;
2447 CV * const form = gp->gp_form;
2448
2449 gp->gp_file_hek = NULL;
2450 gp->gp_sv = NULL;
2451 gp->gp_av = NULL;
2452 gp->gp_hv = NULL;
2453 gp->gp_io = NULL;
2454 gp->gp_cv = NULL;
2455 gp->gp_form = NULL;
2456
2457 if (file_hek)
2458 unshare_hek(file_hek);
2459
2460 SvREFCNT_dec(sv);
2461 SvREFCNT_dec(av);
2462 /* FIXME - another reference loop GV -> symtab -> GV ?
2463 Somehow gp->gp_hv can end up pointing at freed garbage. */
2464 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2465 const HEK *hvname_hek = HvNAME_HEK(hv);
10bafe90 2466 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
c2242065 2467 if (PL_stashcache && hvname_hek)
0ca9877d 2468 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC
2469 SvREFCNT_dec(hv);
2470 }
2471 SvREFCNT_dec(io);
2472 SvREFCNT_dec(cv);
2473 SvREFCNT_dec(form);
2474
bc81b34d
FC
2475 /* Possibly reallocated by a destructor */
2476 gp = GvGP(gv);
2477
b0d55c99
FC
2478 if (!gp->gp_file_hek
2479 && !gp->gp_sv
2480 && !gp->gp_av
2481 && !gp->gp_hv
2482 && !gp->gp_io
2483 && !gp->gp_cv
2484 && !gp->gp_form) break;
2485
2486 if (--attempts == 0) {
2487 Perl_die(aTHX_
2488 "panic: gp_free failed to free glob pointer - "
2489 "something is repeatedly re-creating entries"
2490 );
2491 }
13207a71 2492 }
748a9306 2493
bc81b34d
FC
2494 /* Possibly incremented by a destructor doing glob assignment */
2495 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2496 Safefree(gp);
c43ae56f 2497 GvGP_set(gv, NULL);
79072805
LW
2498}
2499
d460ef45
NIS
2500int
2501Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2502{
53c1dcc0
AL
2503 AMT * const amtp = (AMT*)mg->mg_ptr;
2504 PERL_UNUSED_ARG(sv);
dd374669 2505
7918f24d
NC
2506 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2507
d460ef45
NIS
2508 if (amtp && AMT_AMAGIC(amtp)) {
2509 int i;
2510 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2511 CV * const cv = amtp->table[i];
b37c2d43 2512 if (cv) {
e7881358 2513 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2514 amtp->table[i] = NULL;
d460ef45
NIS
2515 }
2516 }
2517 }
2518 return 0;
2519}
2520
a0d0e21e 2521/* Updates and caches the CV's */
c3a9a790
RGS
2522/* Returns:
2523 * 1 on success and there is some overload
2524 * 0 if there is no overload
2525 * -1 if some error occurred and it couldn't croak
2526 */
a0d0e21e 2527
c3a9a790 2528int
242f8760 2529Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2530{
ad64d0ec 2531 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2532 AMT amt;
9b439311 2533 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2534 U32 newgen;
a0d0e21e 2535
7918f24d
NC
2536 PERL_ARGS_ASSERT_GV_AMUPDATE;
2537
9b439311 2538 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2539 if (mg) {
2540 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2541 if (amtp->was_ok_sub == newgen) {
8c34e50d 2542 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2543 }
ad64d0ec 2544 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2545 }
a0d0e21e 2546
bfcb3514 2547 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2548
d460ef45 2549 Zero(&amt,1,AMT);
e1a479c5 2550 amt.was_ok_sub = newgen;
a6006777
PP
2551 amt.fallback = AMGfallNO;
2552 amt.flags = 0;
2553
a6006777 2554 {
8c34e50d
FC
2555 int filled = 0;
2556 int i;
3d147ac2
DM
2557 bool deref_seen = 0;
2558
a6006777 2559
3866ea3b 2560 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2561
89ffc314 2562 /* Try to find via inheritance. */
e6919483 2563 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2564 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2565 CV* cv;
89ffc314
IZ
2566
2567 if (!gv)
3866ea3b
FC
2568 {
2569 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2570 goto no_table;
3866ea3b
FC
2571 }
2572#ifdef PERL_DONT_CREATE_GVSV
2573 else if (!sv) {
6f207bd3 2574 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2575 }
2576#endif
79c9643d
JL
2577 else if (SvTRUE(sv))
2578 /* don't need to set overloading here because fallback => 1
2579 * is the default setting for classes without overloading */
89ffc314 2580 amt.fallback=AMGfallYES;
79c9643d
JL
2581 else if (SvOK(sv)) {
2582 amt.fallback=AMGfallNEVER;
386a5489 2583 filled = 1;
386a5489 2584 }
79c9643d 2585 else {
386a5489 2586 filled = 1;
386a5489 2587 }
a6006777 2588
3d147ac2 2589 assert(SvOOK(stash));
3d147ac2 2590 /* initially assume the worst */
339441ef 2591 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2592
8c34e50d 2593 for (i = 1; i < NofAMmeth; i++) {
6136c704 2594 const char * const cooky = PL_AMG_names[i];
32251b26 2595 /* Human-readable form, for debugging: */
8c34e50d 2596 const char * const cp = AMG_id2name(i);
d279ab82 2597 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2598
a0288114 2599 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2600 cp, HvNAME_get(stash)) );
611c1e95
IZ
2601 /* don't fill the cache while looking up!
2602 Creation of inheritance stubs in intermediate packages may
2603 conflict with the logic of runtime method substitution.
2604 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2605 then we could have created stubs for "(+0" in A and C too.
2606 But if B overloads "bool", we may want to use it for
2607 numifying instead of C's "+0". */
8c34e50d 2608 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2609 cv = 0;
56117e3e 2610 if (gv && (cv = GvCV(gv)) && CvGV(cv)) {
f0e9f182
FC
2611 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2612 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2613 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2614 && strEQ(hvname, "overload")) {
611c1e95
IZ
2615 /* This is a hack to support autoloading..., while
2616 knowing *which* methods were declared as overloaded. */
44a8e56a 2617 /* GvSV contains the name of the method. */
6136c704 2618 GV *ngv = NULL;
c69033f2 2619 SV *gvsv = GvSV(gv);
a0288114
AL
2620
2621 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2622 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2623 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2624 if (!gvsv || !SvPOK(gvsv)
7f415459 2625 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2626 {
a0288114 2627 /* Can be an import stub (created by "can"). */
242f8760 2628 if (destructing) {
c3a9a790 2629 return -1;
242f8760
RGS
2630 }
2631 else {
d66cca07
BF
2632 const SV * const name = (gvsv && SvPOK(gvsv))
2633 ? gvsv
2634 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2635 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2636 Perl_croak(aTHX_ "%s method \"%"SVf256
2637 "\" overloading \"%s\" "\
d0c0e7dd 2638 "in package \"%"HEKf256"\"",
242f8760
RGS
2639 (GvCVGEN(gv) ? "Stub found while resolving"
2640 : "Can't resolve"),
d66cca07 2641 SVfARG(name), cp,
d0c0e7dd 2642 HEKfARG(
d66cca07 2643 HvNAME_HEK(stash)
d0c0e7dd 2644 ));
242f8760 2645 }
44a8e56a 2646 }
dc848c6f 2647 cv = GvCV(gv = ngv);
f0e9f182 2648 }
44a8e56a 2649 }
b464bac0 2650 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2651 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2652 GvNAME(CvGV(cv))) );
2653 filled = 1;
611c1e95 2654 } else if (gv) { /* Autoloaded... */
ea726b52 2655 cv = MUTABLE_CV(gv);
611c1e95 2656 filled = 1;
44a8e56a 2657 }
ea726b52 2658 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM
2659
2660 if (gv) {
2661 switch (i) {
2662 case to_sv_amg:
2663 case to_av_amg:
2664 case to_hv_amg:
2665 case to_gv_amg:
2666 case to_cv_amg:
2667 case nomethod_amg:
2668 deref_seen = 1;
2669 break;
2670 }
2671 }
a0d0e21e 2672 }
3d147ac2 2673 if (!deref_seen)
45479970
DM
2674 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2675 * NB - aux var invalid here, HvARRAY() could have been
2676 * reallocated since it was assigned to */
2677 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2678
a0d0e21e 2679 if (filled) {
a6006777 2680 AMT_AMAGIC_on(&amt);
ad64d0ec 2681 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2682 (char*)&amt, sizeof(AMT));
8c34e50d 2683 return TRUE;
a0d0e21e
LW
2684 }
2685 }
a6006777 2686 /* Here we have no table: */
8c34e50d 2687 no_table:
a6006777 2688 AMT_AMAGIC_off(&amt);
ad64d0ec 2689 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2690 (char*)&amt, sizeof(AMTS));
c3a9a790 2691 return 0;
a0d0e21e
LW
2692}
2693
32251b26
IZ
2694
2695CV*
2696Perl_gv_handler(pTHX_ HV *stash, I32 id)
2697{
3f8f4626 2698 MAGIC *mg;
32251b26 2699 AMT *amtp;
e1a479c5 2700 U32 newgen;
9b439311 2701 struct mro_meta* stash_meta;
32251b26 2702
bfcb3514 2703 if (!stash || !HvNAME_get(stash))
601f1833 2704 return NULL;
e1a479c5 2705
9b439311
BB
2706 stash_meta = HvMROMETA(stash);
2707 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2708
ad64d0ec 2709 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2710 if (!mg) {
2711 do_update:
8c34e50d 2712 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2713 return NULL;
ad64d0ec 2714 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2715 }
a9fd4e40 2716 assert(mg);
32251b26 2717 amtp = (AMT*)mg->mg_ptr;
66978156 2718 if ( amtp->was_ok_sub != newgen )
32251b26 2719 goto do_update;
3ad83ce7 2720 if (AMT_AMAGIC(amtp)) {
b7787f18 2721 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2722 if (ret && isGV(ret)) { /* Autoloading stab */
2723 /* Passing it through may have resulted in a warning
2724 "Inherited AUTOLOAD for a non-method deprecated", since
2725 our caller is going through a function call, not a method call.
2726 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2727 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2728
2729 if (gv && GvCV(gv))
2730 return GvCV(gv);
2731 }
2732 return ret;
2733 }
a0288114 2734
601f1833 2735 return NULL;
32251b26
IZ
2736}
2737
2738
6f1401dc
DM
2739/* Implement tryAMAGICun_MG macro.
2740 Do get magic, then see if the stack arg is overloaded and if so call it.
2741 Flags:
2742 AMGf_set return the arg using SETs rather than assigning to
2743 the targ
2744 AMGf_numeric apply sv_2num to the stack arg.
2745*/
2746
2747bool
2748Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM
2749 dSP;
2750 SV* tmpsv;
2751 SV* const arg = TOPs;
2752
2753 SvGETMAGIC(arg);
2754
9f8bf298
NC
2755 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2756 AMGf_noright | AMGf_unary))) {
6f1401dc
DM
2757 if (flags & AMGf_set) {
2758 SETs(tmpsv);
2759 }
2760 else {
2761 dTARGET;
2762 if (SvPADMY(TARG)) {
2763 sv_setsv(TARG, tmpsv);
2764 SETTARG;
2765 }
2766 else
2767 SETs(tmpsv);
2768 }
2769 PUTBACK;
2770 return TRUE;
2771 }
2772
2773 if ((flags & AMGf_numeric) && SvROK(arg))
2774 *sp = sv_2num(arg);
2775 return FALSE;
2776}
2777
2778
2779/* Implement tryAMAGICbin_MG macro.
2780 Do get magic, then see if the two stack args are overloaded and if so
2781 call it.
2782 Flags:
2783 AMGf_set return the arg using SETs rather than assigning to
2784 the targ
2785 AMGf_assign op may be called as mutator (eg +=)
2786 AMGf_numeric apply sv_2num to the stack arg.
2787*/
2788
2789bool
2790Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM
2791 dSP;
2792 SV* const left = TOPm1s;
2793 SV* const right = TOPs;
2794
2795 SvGETMAGIC(left);
2796 if (left != right)
2797 SvGETMAGIC(right);
2798
2799 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2800 SV * const tmpsv = amagic_call(left, right, method,
2801 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2802 if (tmpsv) {
2803 if (flags & AMGf_set) {
2804 (void)POPs;
2805 SETs(tmpsv);
2806 }
2807 else {
2808 dATARGET;
2809 (void)POPs;
2810 if (opASSIGN || SvPADMY(TARG)) {
2811 sv_setsv(TARG, tmpsv);
2812 SETTARG;
2813 }
2814 else
2815 SETs(tmpsv);
2816 }
2817 PUTBACK;
2818 return TRUE;
2819 }
2820 }
75ea7a12
FC
2821 if(left==right && SvGMAGICAL(left)) {
2822 SV * const left = sv_newmortal();
2823 *(sp-1) = left;
2824 /* Print the uninitialized warning now, so it includes the vari-
2825 able name. */
2826 if (!SvOK(right)) {
2827 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2828 sv_setsv_flags(left, &PL_sv_no, 0);
2829 }
2830 else sv_setsv_flags(left, right, 0);
2831 SvGETMAGIC(right);
2832 }
6f1401dc 2833 if (flags & AMGf_numeric) {
75ea7a12
FC
2834 if (SvROK(TOPm1s))
2835 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2836 if (SvROK(right))
2837 *sp = sv_2num(right);
2838 }
2839 return FALSE;
2840}
2841
25a9ffce
NC
2842SV *
2843Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2844 SV *tmpsv = NULL;
3d147ac2 2845 HV *stash;
25a9ffce
NC
2846
2847 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2848
3d147ac2
DM
2849 if (!SvAMAGIC(ref))
2850 return ref;
2851 /* return quickly if none of the deref ops are overloaded */
2852 stash = SvSTASH(SvRV(ref));
2853 assert(SvOOK(stash));
2854 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2855 return ref;
2856
2857 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC
2858 AMGf_noright | AMGf_unary))) {
2859 if (!SvROK(tmpsv))
2860 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2861 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2862 /* Bail out if it returns us the same reference. */
2863 return tmpsv;
2864 }
2865 ref = tmpsv;
3d147ac2
DM
2866 if (!SvAMAGIC(ref))
2867 break;
25a9ffce
NC
2868 }
2869 return tmpsv ? tmpsv : ref;
2870}
6f1401dc 2871
8d569291
FC
2872bool
2873Perl_amagic_is_enabled(pTHX_ int method)
2874{
2875 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2876
2877 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2878
2879 if ( !lex_mask || !SvOK(lex_mask) )
2880 /* overloading lexically disabled */
2881 return FALSE;
2882 else if ( lex_mask && SvPOK(lex_mask) ) {
2883 /* we have an entry in the hints hash, check if method has been
2884 * masked by overloading.pm */
2885 STRLEN len;
2886 const int offset = method / 8;
2887 const int bit = method % 8;
2888 char *pv = SvPV(lex_mask, len);
2889
2890 /* Bit set, so this overloading operator is disabled */
2891 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2892 return FALSE;
2893 }
2894 return TRUE;
2895}
2896
a0d0e21e 2897SV*
864dbfa3 2898Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2899{
27da23d5 2900 dVAR;
b267980d 2901 MAGIC *mg;
9c5ffd7c 2902 CV *cv=NULL;
a0d0e21e 2903 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2904 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2905 int off = 0, off1, lr = 0, notfound = 0;
2906 int postpr = 0, force_cpy = 0;
2907 int assign = AMGf_assign & flags;
2908 const int assignshift = assign ? 1 : 0;
bf5522a1 2909 int use_default_op = 0;
67288365 2910 int force_scalar = 0;
497b47a8
JH
2911#ifdef DEBUGGING
2912 int fl=0;
497b47a8 2913#endif
25716404 2914 HV* stash=NULL;
7918f24d
NC
2915
2916 PERL_ARGS_ASSERT_AMAGIC_CALL;
2917
e46c382e 2918 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2919 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
2920 }
2921
a0d0e21e 2922 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2923 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2924 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2925 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2926 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2927 : NULL))
b267980d 2928 && ((cv = cvp[off=method+assignshift])
748a9306
LW
2929 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2930 * usual method */
497b47a8
JH
2931 (
2932#ifdef DEBUGGING
2933 fl = 1,
a0288114 2934#endif
497b47a8 2935 cv = cvp[off=method])))) {
a0d0e21e
LW
2936 lr = -1; /* Call method for left argument */
2937 } else {
2938 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2939 int logic;
2940
2941 /* look for substituted methods */
ee239bfe 2942 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
2943 switch (method) {
2944 case inc_amg:
ee239bfe
IZ
2945 force_cpy = 1;
2946 if ((cv = cvp[off=add_ass_amg])
2947 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2948 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2949 }
2950 break;
2951 case dec_amg:
ee239bfe
IZ
2952 force_cpy = 1;
2953 if ((cv = cvp[off = subtr_ass_amg])
2954 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2955 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2956 }
2957 break;
2958 case bool__amg:
2959 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2960 break;
2961 case numer_amg:
2962 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2963 break;
2964 case string_amg:
2965 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2966 break;
b7787f18
AL
2967 case not_amg:
2968 (void)((cv = cvp[off=bool__amg])
2969 || (cv = cvp[off=numer_amg])
2970 || (cv = cvp[off=string_amg]));
2ab54efd
MB
2971 if (cv)
2972 postpr = 1;
b7787f18 2973 break;
748a9306
LW
2974 case copy_amg:
2975 {
76e3520e
GS
2976 /*
2977 * SV* ref causes confusion with the interpreter variable of
2978 * the same name
2979 */
890ce7af 2980 SV* const tmpRef=SvRV(left);
76e3520e 2981 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
2982 /*
2983 * Just to be extra cautious. Maybe in some
2984 * additional cases sv_setsv is safe, too.
2985 */
890ce7af 2986 SV* const newref = newSVsv(tmpRef);
748a9306 2987 SvOBJECT_on(newref);
a1cd65be
FC
2988 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2989 delegate to the stash. */
85fbaab2 2990 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
2991 return newref;
2992 }
2993 }
2994 break;
a0d0e21e 2995 case abs_amg:
b267980d 2996 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2997 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2998 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2999 if (off1==lt_amg) {
890ce7af 3000 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3001 lt_amg,AMGf_noright);
3002 logic = SvTRUE(lessp);
3003 } else {
890ce7af 3004 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
3005 ncmp_amg,AMGf_noright);
3006 logic = (SvNV(lessp) < 0);
3007 }
3008 if (logic) {
3009 if (off==subtr_amg) {
3010 right = left;
748a9306 3011 left = nullsv;
a0d0e21e
LW
3012 lr = 1;
3013 }
3014 } else {
3015 return left;
3016 }
3017 }
3018 break;
3019 case neg_amg:
155aba94 3020 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
3021 right = left;
3022 left = sv_2mortal(newSViv(0));
3023 lr = 1;
3024 }
3025 break;
f216259d 3026 case int_amg:
f5284f61 3027 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3028 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3029 case regexp_amg:
b267980d
NIS
3030 /* FAIL safe */
3031 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3032
f5284f61
IZ
3033 case to_sv_amg:
3034 case to_av_amg:
3035 case to_hv_amg:
3036 case to_gv_amg:
3037 case to_cv_amg:
3038 /* FAIL safe */
b267980d 3039 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3040
a0d0e21e
LW
3041 default:
3042 goto not_found;
3043 }
3044 if (!cv) goto not_found;
3045 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3046 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3047 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3048 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3049 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3050 : NULL))
69815d08
RS
3051 && (cv = cvp[off=method])) { /* Method for right
3052 * argument found */
3053 lr=1;
bf5522a1
MB
3054 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3055 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
3056 && !(flags & AMGf_unary)) {
3057 /* We look for substitution for
3058 * comparison operations and
fc36a67e 3059 * concatenation */
a0d0e21e
LW
3060 if (method==concat_amg || method==concat_ass_amg
3061 || method==repeat_amg || method==repeat_ass_amg) {
3062 return NULL; /* Delegate operation to string conversion */
3063 }
3064 off = -1;
3065 switch (method) {
3066 case lt_amg:
3067 case le_amg:
3068 case gt_amg:
3069 case ge_amg:
3070 case eq_amg:
3071 case ne_amg:
2ab54efd
MB
3072 off = ncmp_amg;
3073 break;
a0d0e21e
LW
3074 case slt_amg:
3075 case sle_amg:
3076 case sgt_amg:
3077 case sge_amg:
3078 case seq_amg:
3079 case sne_amg:
2ab54efd
MB
3080 off = scmp_amg;
3081 break;
a0d0e21e 3082 }
bf5522a1
MB
3083 if (off != -1) {
3084 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3085 cv = ocvp[off];
3086 lr = -1;
3087 }
3088 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3089 cv = cvp[off];
3090 lr = 1;
3091 }
3092 }
3093 if (cv)
2ab54efd
MB
3094 postpr = 1;
3095 else
3096 goto not_found;
a0d0e21e 3097 } else {
a6006777 3098 not_found: /* No method found, either report or croak */
b267980d
NIS
3099 switch (method) {
3100 case to_sv_amg:
3101 case to_av_amg:
3102 case to_hv_amg:
3103 case to_gv_amg:
3104 case to_cv_amg:
3105 /* FAIL safe */
3106 return left; /* Delegate operation to standard mechanisms. */
b267980d 3107 }
a0d0e21e
LW
3108 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3109 notfound = 1; lr = -1;
3110 } else if (cvp && (cv=cvp[nomethod_amg])) {
3111 notfound = 1; lr = 1;
bf5522a1
MB
3112 } else if ((use_default_op =
3113 (!ocvp || oamtp->fallback >= AMGfallYES)
3114 && (!cvp || amtp->fallback >= AMGfallYES))
3115 && !DEBUG_o_TEST) {
4cc0ca18
NC
3116 /* Skip generating the "no method found" message. */
3117 return NULL;
a0d0e21e 3118 } else {
46fc3d4c 3119 SV *msg;
774d564b 3120 if (off==-1) off=method;
b267980d 3121 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
3122 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3123 AMG_id2name(method + assignshift),
3124 (flags & AMGf_unary ? " " : "\n\tleft "),
3125 SvAMAGIC(left)?
3126 "in overloaded package ":
3127 "has no overloaded magic",
3128 SvAMAGIC(left)?
3129 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3130 SVfARG(&PL_sv_no),
3131 SvAMAGIC(right)?
3132 ",\n\tright argument in overloaded package ":
3133 (flags & AMGf_unary
3134 ? ""
3135 : ",\n\tright argument has no overloaded magic"),
3136 SvAMAGIC(right)?
3137 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3138 SVfARG(&PL_sv_no)));
bf5522a1 3139 if (use_default_op) {
d66cca07 3140 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3141 } else {
be2597df 3142 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
3143 }
3144 return NULL;
3145 }
ee239bfe 3146 force_cpy = force_cpy || assign;
a0d0e21e
LW
3147 }
3148 }
67288365
JL
3149
3150 switch (method) {
3151 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3152 * operation. we need this to return a value, so that it can be assigned
3153 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3154 * increment or decrement was itself called in void context */
3155 case inc_amg:
3156 if (off == add_amg)
3157 force_scalar = 1;
3158 break;
3159 case dec_amg:
3160 if (off == subtr_amg)
3161 force_scalar = 1;
3162 break;
3163 /* in these cases, we're calling an assignment variant of an operator
3164 * (+= rather than +, for instance). regardless of whether it's a
3165 * fallback or not, it always has to return a value, which will be
3166 * assigned to the proper variable later */
3167 case add_amg:
3168 case subtr_amg:
3169 case mult_amg:
3170 case div_amg:
3171 case modulo_amg:
3172 case pow_amg:
3173 case lshift_amg:
3174 case rshift_amg:
3175 case repeat_amg:
3176 case concat_amg:
3177 case band_amg:
3178 case bor_amg:
3179 case bxor_amg:
3180 if (assign)
3181 force_scalar = 1;
3182 break;
3183 /* the copy constructor always needs to return a value */
3184 case copy_amg:
3185 force_scalar = 1;
3186 break;
3187 /* because of the way these are implemented (they don't perform the
3188 * dereferencing themselves, they return a reference that perl then
3189 * dereferences later), they always have to be in scalar context */
3190 case to_sv_amg:
3191 case to_av_amg:
3192 case to_hv_amg:
3193 case to_gv_amg:
3194 case to_cv_amg:
3195 force_scalar = 1;
3196 break;
3197 /* these don't have an op of their own; they're triggered by their parent
3198 * op, so the context there isn't meaningful ('$a and foo()' in void
3199 * context still needs to pass scalar context on to $a's bool overload) */
3200 case bool__amg:
3201 case numer_amg:
3202 case string_amg:
3203 force_scalar = 1;
3204 break;
3205 }
3206
497b47a8 3207#ifdef DEBUGGING
a0d0e21e 3208 if (!notfound) {
497b47a8 3209 DEBUG_o(Perl_deb(aTHX_
d66cca07 3210 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
3211 AMG_id2name(off),
3212 method+assignshift==off? "" :
a0288114 3213 " (initially \"",
497b47a8
JH
3214 method+assignshift==off? "" :
3215 AMG_id2name(method+assignshift),
a0288114 3216 method+assignshift==off? "" : "\")",
497b47a8
JH
3217 flags & AMGf_unary? "" :
3218 lr==1 ? " for right argument": " for left argument",
3219 flags & AMGf_unary? " for argument" : "",
d66cca07 3220 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3221 fl? ",\n\tassignment variant used": "") );
ee239bfe 3222 }
497b47a8 3223#endif
748a9306
LW
3224 /* Since we use shallow copy during assignment, we need
3225 * to dublicate the contents, probably calling user-supplied
3226 * version of copy operator
3227 */
ee239bfe
IZ
3228 /* We need to copy in following cases:
3229 * a) Assignment form was called.
3230 * assignshift==1, assign==T, method + 1 == off
3231 * b) Increment or decrement, called directly.
3232 * assignshift==0, assign==0, method + 0 == off
3233 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3234 * assignshift==0, assign==T,
ee239bfe
IZ
3235 * force_cpy == T
3236 * d) Increment or decrement, translated to nomethod.
b267980d 3237 * assignshift==0, assign==0,
ee239bfe
IZ
3238 * force_cpy == T
3239 * e) Assignment form translated to nomethod.
3240 * assignshift==1, assign==T, method + 1 != off
3241 * force_cpy == T
3242 */
3243 /* off is method, method+assignshift, or a result of opcode substitution.
3244 * In the latter case assignshift==0, so only notfound case is important.
3245 */
73512201 3246 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3247 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3248 || force_cpy) )
6f1401dc 3249 {
1b38c28e
NC
3250 /* newSVsv does not behave as advertised, so we copy missing
3251 * information by hand */
3252 SV *tmpRef = SvRV(left);
3253 SV *rv_copy;
31d632c3 3254 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3255 SvRV_set(left, rv_copy);
3256 SvSETMAGIC(left);
e7881358 3257 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3258 }
6f1401dc
DM
3259 }
3260
a0d0e21e
LW
3261 {
3262 dSP;
3263 BINOP myop;
3264 SV* res;
b7787f18 3265 const bool oldcatch = CATCH_GET;
67288365
JL
3266 I32 oldmark, nret;
3267 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3268
54310121 3269 CATCH_SET(TRUE);
a0d0e21e
LW
3270 Zero(&myop, 1, BINOP);
3271 myop.op_last = (OP *) &myop;
b37c2d43 3272 myop.op_next = NULL;
67288365
JL
3273 myop.op_flags = OPf_STACKED;
3274
3275 switch (gimme) {
3276 case G_VOID:
3277 myop.op_flags |= OPf_WANT_VOID;
3278 break;
3279 case G_ARRAY:
3280 if (flags & AMGf_want_list) {
3281 myop.op_flags |= OPf_WANT_LIST;
3282 break;
3283 }
3284 /* FALLTHROUGH */
3285 default:
3286 myop.op_flags |= OPf_WANT_SCALAR;
3287 break;
3288 }
a0d0e21e 3289
e788e7d3 3290 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3291 ENTER;
462e5cf6 3292 SAVEOP();
533c011a 3293 PL_op = (OP *) &myop;
3280af22 3294 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3295 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3296 Perl_pp_pushmark(aTHX);
a0d0e21e 3297
924508f0 3298 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3299 PUSHs(lr>0? right: left);
3300 PUSHs(lr>0? left: right);
3280af22 3301 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3302 if (notfound) {
59cd0e26
NC
3303 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3304 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3305 }
ad64d0ec 3306 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3307 PUTBACK;
67288365 3308 oldmark = TOPMARK;
a0d0e21e 3309
139d0ce6 3310 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3311 CALLRUNOPS(aTHX);
a0d0e21e
LW
3312 LEAVE;
3313 SPAGAIN;
67288365
JL
3314 nret = SP - (PL_stack_base + oldmark);
3315
3316 switch (gimme) {
3317 case G_VOID:
3318 /* returning NULL has another meaning, and we check the context
3319 * at the call site too, so this can be differentiated from the
3320 * scalar case */
3321 res = &PL_sv_undef;
3322 SP = PL_stack_base + oldmark;
3323 break;
3324 case G_ARRAY: {
3325 if (flags & AMGf_want_list) {
3326 res = sv_2mortal((SV *)newAV());
3327 av_extend((AV *)res, nret);
3328 while (nret--)
3329 av_store((AV *)res, nret, POPs);
3330 break;
3331 }
3332 /* FALLTHROUGH */
3333 }
3334 default:
3335 res = POPs;
3336 break;
3337 }
a0d0e21e 3338
ebafeae7 3339 PUTBACK;
d3acc0f7 3340 POPSTACK;
54310121 3341 CATCH_SET(oldcatch);
a0d0e21e 3342
a0d0e21e 3343 if (postpr) {
b7787f18 3344 int ans;
a0d0e21e
LW
3345 switch (method) {
3346 case le_amg:
3347 case sle_amg:
3348 ans=SvIV(res)<=0; break;
3349 case lt_amg:
3350 case slt_amg:
3351 ans=SvIV(res)<0; break;
3352 case ge_amg:
3353 case sge_amg:
3354 ans=SvIV(res)>=0; break;
3355 case gt_amg:
3356 case sgt_amg:
3357 ans=SvIV(res)>0; break;
3358 case eq_amg:
3359 case seq_amg:
3360 ans=SvIV(res)==0; break;
3361 case ne_amg:
3362 case sne_amg:
3363 ans=SvIV(res)!=0; break;
3364 case inc_amg:
3365 case dec_amg:
bbce6d69 3366 SvSetSV(left,res); return left;
dc437b57 3367 case not_amg:
fe7ac86a 3368 ans=!SvTRUE(res); break;
b7787f18
AL
3369 default:
3370 ans=0; break;
a0d0e21e 3371 }
54310121 3372 return boolSV(ans);
748a9306
LW
3373 } else if (method==copy_amg) {
3374 if (!SvROK(res)) {
cea2e8a9 3375 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3376 }
3377 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3378 } else {
3379 return res;
3380 }
3381 }
3382}
c9d5ac95 3383
f5c1e807
NC
3384void
3385Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3386{
3387 dVAR;
acda4c6a 3388 U32 hash;
f5c1e807 3389
7918f24d 3390 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3391
acda4c6a
NC
3392 if (len > I32_MAX)
3393 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3394
ae8cc45f
NC
3395 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3396 unshare_hek(GvNAME_HEK(gv));
3397 }
3398
acda4c6a 3399 PERL_HASH(hash, name, len);
c60dbbc3 3400 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3401}
3402
66610fdd 3403/*
f7461760
Z
3404=for apidoc gv_try_downgrade
3405
2867cdbc
Z
3406If the typeglob C<gv> can be expressed more succinctly, by having
3407something other than a real GV in its place in the stash, replace it
3408with the optimised form. Basic requirements for this are that C<gv>
3409is a real typeglob, is sufficiently ordinary, and is only referenced
3410from its package. This function is meant to be used when a GV has been
3411looked up in part to see what was there, causing upgrading, but based
3412on what was found it turns out that the real GV isn't required after all.
3413
3414If C<gv> is a completely empty typeglob, it is deleted from the stash.
3415
3416If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3417sub, the typeglob is replaced with a scalar-reference placeholder that
3418more compactly represents the same thing.
f7461760
Z
3419
3420=cut
3421*/
3422
3423void
3424Perl_gv_try_downgrade(pTHX_ GV *gv)
3425{
3426 HV *stash;
3427 CV *cv;
3428 HEK *namehek;
3429 SV **gvp;
3430 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3431
3432 /* XXX Why and where does this leave dangling pointers during global
3433 destruction? */
627364f1 3434 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3435
2867cdbc 3436 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3437 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3438 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3439 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3440 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3441 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3442 return;
2be08ad1
FC
3443 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3444 return;
803f2748
DM
3445 if (SvMAGICAL(gv)) {
3446 MAGIC *mg;
3447 /* only backref magic is allowed */
3448 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3449 return;
3450 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3451 if (mg->mg_type != PERL_MAGIC_backref)
3452 return;
3453 }
3454 }
2867cdbc
Z
3455 cv = GvCV(gv);
3456 if (!cv) {
3457 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3458 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3459 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760
Z
3460 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3461 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3462 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3463 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3464 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3465 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z
3466 *gvp == (SV*)gv) {
3467 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3468 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3469 SvREFCNT(gv) = 0;
3470 sv_clear((SV*)gv);
3471 SvREFCNT(gv) = 1;
70e5f2b5 3472 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z
3473 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3474 STRUCT_OFFSET(XPVIV, xiv_iv));
3475 SvRV_set(gv, value);
3476 }
3477}
3478
9e3fb20c
FC
3479GV *
3480Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3481{
3482 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3483 GV * const *gvp;
3484 PERL_ARGS_ASSERT_GV_OVERRIDE;
3485 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3486 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3487 gv = gvp ? *gvp : NULL;
3488 if (gv && !isGV(gv)) {
3489 if (!SvPCS_IMPORTED(gv)) return NULL;
3490 gv_init(gv, PL_globalstash, name, len, 0);
3491 return gv;
3492 }
3493 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3494}
3495
4aaa4757
FC
3496#include "XSUB.h"
3497
3498static void
3499core_xsub(pTHX_ CV* cv)
3500{
3501 Perl_croak(aTHX_
3502 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3503 );
3504}
3505
f7461760 3506/*
66610fdd
RGS
3507 * Local variables:
3508 * c-indentation-style: bsd
3509 * c-basic-offset: 4
14d04a33 3510 * indent-tabs-mode: nil
66610fdd
RGS
3511 * End:
3512 *
14d04a33 3513 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3514 */