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Improve the logic in regen_perly.pl for manually generating token macros.
[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW		 14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW		 20 */
21
ccfc67b7
JH		 22/*
23=head1 GV Functions
166f8a29
DM		 24
25A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
26It is a structure that holds a pointer to a scalar, an array, a hash etc,
27corresponding to $foo, @foo, %foo.
28
29GVs are usually found as values in stashes (symbol table hashes) where
30Perl stores its global variables.
31
32=cut
ccfc67b7
JH		 33*/
34
79072805 35#include "EXTERN.h"
864dbfa3 36#define PERL_IN_GV_C
79072805 37#include "perl.h"
8261f8eb 38#include "overload.c"
4aaa4757 39#include "keywords.h"
2846acbf 40#include "feature.h"
79072805 41
f54cb97a
AL		 42static const char S_autoload[] = "AUTOLOAD";
43static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 44
c69033f2 45GV *
d5713896 46Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 47{
d5713896 48 SV **where;
7918f24d 49
13be902c
FC		 50 if (
51 !gv
52 || (
53 SvTYPE((const SV *)gv) != SVt_PVGV
54 && SvTYPE((const SV *)gv) != SVt_PVLV
55 )
56 ) {
bb85b28a
NC		 57 const char *what;
58 if (type == SVt_PVIO) {
59 /*
60 * if it walks like a dirhandle, then let's assume that
61 * this is a dirhandle.
62 */
332c2eac 63 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 64 "dirhandle" : "filehandle";
bb85b28a
NC		 65 } else if (type == SVt_PVHV) {
66 what = "hash";
67 } else {
68 what = type == SVt_PVAV ? "array" : "scalar";
69 }
de6f7947 70 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 71 Perl_croak(aTHX_ "Bad symbol for %s", what);
72 }
d5713896
NC		 73
74 if (type == SVt_PVHV) {
75 where = (SV **)&GvHV(gv);
76 } else if (type == SVt_PVAV) {
77 where = (SV **)&GvAV(gv);
bb85b28a
NC		 78 } else if (type == SVt_PVIO) {
79 where = (SV **)&GvIOp(gv);
d5713896
NC		 80 } else {
81 where = &GvSV(gv);
82 }
7918f24d 83
d5713896
NC		 84 if (!*where)
85 *where = newSV_type(type);
986d39ee
FC		 86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
79072805
LW		 89 return gv;
90}
91
92GV *
864dbfa3 93Perl_gv_fetchfile(pTHX_ const char *name)
79072805 94{
7918f24d 95 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC		 96 return gv_fetchfile_flags(name, strlen(name), 0);
97}
98
99GV *
100Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
101 const U32 flags)
102{
97aff369 103 dVAR;
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW		 107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC		 110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS		 116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS		 120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC		 122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
5a9a79a4
FC		 132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
133 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
53d95988
CS		 134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW		 136 return gv;
137}
138
62d55b22
NC		 139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d
NC		 153 PERL_ARGS_ASSERT_GV_CONST_SV;
154
62d55b22
NC		 155 if (SvTYPE(gv) == SVt_PVGV)
156 return cv_const_sv(GvCVu(gv));
157 return SvROK(gv) ? SvRV(gv) : NULL;
158}
159
12816592
NC		 160GP *
161Perl_newGP(pTHX_ GV *const gv)
162{
163 GP *gp;
19bad673 164 U32 hash;
19bad673
NC		 165 const char *file;
166 STRLEN len;
2639089b
DD		 167#ifndef USE_ITHREADS
168 SV * temp_sv;
169#endif
c2587955 170 dVAR;
19bad673 171
7918f24d 172 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD		 173 Newxz(gp, 1, GP);
174 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
175#ifndef PERL_DONT_CREATE_GVSV
176 gp->gp_sv = newSV(0);
177#endif
7918f24d 178
2639089b
DD		 179#ifdef USE_ITHREADS
180 if (PL_curcop) {
181 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
182 if (CopFILE(PL_curcop)) {
183 file = CopFILE(PL_curcop);
184 len = strlen(file);
185 }
186 else goto no_file;
187 }
188 else {
189 no_file:
190 file = "";
191 len = 0;
192 }
193#else
194 if(PL_curcop)
195 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
196 temp_sv = CopFILESV(PL_curcop);
19bad673
NC		 197 if (temp_sv) {
198 file = SvPVX(temp_sv);
199 len = SvCUR(temp_sv);
200 } else {
201 file = "";
202 len = 0;
203 }
204#endif
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 }
b290562e 235 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
803f2748 236
b290562e 237 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 238 assert(!CvCVGV_RC(cv));
803f2748
DM		 239
240 if (!gv)
241 return;
242
c794ca97
DM		 243 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
244 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
245 else {
cfc1e951 246 CvCVGV_RC_on(cv);
803f2748
DM		 247 SvREFCNT_inc_simple_void_NN(gv);
248 }
803f2748
DM		 249}
250
c68d9564
Z		 251/* Assign CvSTASH(cv) = st, handling weak references. */
252
253void
254Perl_cvstash_set(pTHX_ CV *cv, HV *st)
255{
256 HV *oldst = CvSTASH(cv);
257 PERL_ARGS_ASSERT_CVSTASH_SET;
258 if (oldst == st)
259 return;
260 if (oldst)
261 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
262 SvANY(cv)->xcv_stash = st;
263 if (st)
264 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
265}
803f2748 266
e1104062
FC		 267/*
268=for apidoc gv_init_pvn
269
270Converts a scalar into a typeglob. This is an incoercible typeglob;
271assigning a reference to it will assign to one of its slots, instead of
272overwriting it as happens with typeglobs created by SvSetSV. Converting
273any scalar that is SvOK() may produce unpredictable results and is reserved
274for perl's internal use.
275
276C<gv> is the scalar to be converted.
277
278C<stash> is the parent stash/package, if any.
279
04ec7e59
FC		 280C<name> and C<len> give the name. The name must be unqualified;
281that is, it must not include the package name. If C<gv> is a
e1104062
FC		 282stash element, it is the caller's responsibility to ensure that the name
283passed to this function matches the name of the element. If it does not
284match, perl's internal bookkeeping will get out of sync.
285
04ec7e59
FC		 286C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
287the return value of SvUTF8(sv). It can also take the
288GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC		 289seen before (i.e., suppress "Used once" warnings).
290
291=for apidoc gv_init
292
293The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC		 294has no flags parameter. If the C<multi> parameter is set, the
295GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC		 296
297=for apidoc gv_init_pv
298
299Same as gv_init_pvn(), but takes a nul-terminated string for the name
300instead of separate char * and length parameters.
301
302=for apidoc gv_init_sv
303
304Same as gv_init_pvn(), but takes an SV * for the name instead of separate
305char * and length parameters. C<flags> is currently unused.
306
307=cut
308*/
309
463ee0b2 310void
04ec7e59 311Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF		 312{
313 char *namepv;
314 STRLEN namelen;
315 PERL_ARGS_ASSERT_GV_INIT_SV;
316 namepv = SvPV(namesv, namelen);
317 if (SvUTF8(namesv))
318 flags |= SVf_UTF8;
04ec7e59 319 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF		 320}
321
322void
04ec7e59 323Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF		 324{
325 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 326 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF		 327}
328
329void
04ec7e59 330Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 331{
27da23d5 332 dVAR;
3b6733bf
NC		 333 const U32 old_type = SvTYPE(gv);
334 const bool doproto = old_type > SVt_NULL;
f9509170 335 char * const proto = (doproto && SvPOK(gv))
dad95a0a 336 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 337 : NULL;
49a54bbe 338 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 339 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 340 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 341 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 342
e6066781 343 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC		 344 assert (!(proto && has_constant));
345
346 if (has_constant) {
5c1f4d79
NC		 347 /* The constant has to be a simple scalar type. */
348 switch (SvTYPE(has_constant)) {
349 case SVt_PVAV:
350 case SVt_PVHV:
351 case SVt_PVCV:
352 case SVt_PVFM:
353 case SVt_PVIO:
354 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
355 sv_reftype(has_constant, 0));
42d0e0b7 356 default: NOOP;
5c1f4d79 357 }
756cb477
NC		 358 SvRV_set(gv, NULL);
359 SvROK_off(gv);
360 }
463ee0b2 361
3b6733bf
NC		 362
363 if (old_type < SVt_PVGV) {
364 if (old_type >= SVt_PV)
365 SvCUR_set(gv, 0);
ad64d0ec 366 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 367 }
55d729e4
GS		 368 if (SvLEN(gv)) {
369 if (proto) {
f880fe2f 370 SvPV_set(gv, NULL);
b162af07 371 SvLEN_set(gv, 0);
55d729e4
GS		 372 SvPOK_off(gv);
373 } else
94010e71 374 Safefree(SvPVX_mutable(gv));
55d729e4 375 }
2e5b91de
NC		 376 SvIOK_off(gv);
377 isGV_with_GP_on(gv);
12816592 378
c43ae56f 379 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 380 GvSTASH(gv) = stash;
381 if (stash)
ad64d0ec 382 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 383 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 384 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
385 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 386 if (doproto) {
e3d2b9e7 387 CV *cv;
756cb477
NC		 388 if (has_constant) {
389 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 390 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 391 /* In case op.c:S_process_special_blocks stole it: */
392 if (!GvCV(gv))
c43ae56f 393 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 394 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 395 /* If this reference was a copy of another, then the subroutine
396 must have been "imported", by a Perl space assignment to a GV
397 from a reference to CV. */
398 if (exported_constant)
399 GvIMPORTED_CV_on(gv);
186a5ba8 400 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 401 } else {
186a5ba8 402 cv = newSTUB(gv,1);
756cb477 403 }
55d729e4 404 if (proto) {
e3d2b9e7 405 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 406 SV_HAS_TRAILING_NUL);
e0260a5b 407 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 408 }
409 }
463ee0b2
LW		 410}
411
76e3520e 412STATIC void
e6066781 413S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 414{
e6066781 415 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 416
a0d0e21e
LW		 417 switch (sv_type) {
418 case SVt_PVIO:
419 (void)GvIOn(gv);
420 break;
421 case SVt_PVAV:
422 (void)GvAVn(gv);
423 break;
424 case SVt_PVHV:
425 (void)GvHVn(gv);
426 break;
c69033f2
NC		 427#ifdef PERL_DONT_CREATE_GVSV
428 case SVt_NULL:
429 case SVt_PVCV:
430 case SVt_PVFM:
e654831b 431 case SVt_PVGV:
c69033f2
NC		 432 break;
433 default:
dbdce04c
NC		 434 if(GvSVn(gv)) {
435 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
436 If we just cast GvSVn(gv) to void, it ignores evaluating it for
437 its side effect */
438 }
c69033f2 439#endif
a0d0e21e
LW		 440 }
441}
442
0f8d4b5e
FC		 443static void core_xsub(pTHX_ CV* cv);
444
445static GV *
446S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 447 const char * const name, const STRLEN len)
0f8d4b5e
FC		 448{
449 const int code = keyword(name, len, 1);
450 static const char file[] = __FILE__;
97021f77 451 CV *cv, *oldcompcv = NULL;
0f8d4b5e 452 int opnum = 0;
0f8d4b5e 453 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 454 COP *oldcurcop = NULL;
455 yy_parser *oldparser = NULL;
456 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 457
458 assert(gv || stash);
459 assert(name);
0f8d4b5e 460
88b892d8
FC		 461 if (!code) return NULL; /* Not a keyword */
462 switch (code < 0 ? -code : code) {
0f8d4b5e 463 /* no support for \&CORE::infix;
d885f758 464 no support for funcs that do not parse like funcs */
88b892d8
FC		 465 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
466 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp: case KEY_CORE :
eb31eb35 467 case KEY_default : case KEY_DESTROY:
88b892d8 468 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 469 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 470 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 471 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 472 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
473 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
474 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 475 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 476 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 477 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 478 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 479 case KEY_state: case KEY_sub :
46bef06f 480 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 481 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
482 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 483 return NULL;
484 case KEY_chdir:
eb31eb35 485 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 486 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 487 case KEY_keys:
488 case KEY_lstat:
489 case KEY_pop:
490 case KEY_push:
491 case KEY_shift:
a99f2ca2 492 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 493 case KEY_stat:
494 case KEY_system:
495 case KEY_truncate: case KEY_unlink:
496 case KEY_unshift:
497 case KEY_values:
498 ampable = FALSE;
499 }
500 if (!gv) {
501 gv = (GV *)newSV(0);
502 gv_init(gv, stash, name, len, TRUE);
503 }
7e68c38b 504 GvMULTI_on(gv);
0f8d4b5e
FC		 505 if (ampable) {
506 ENTER;
507 oldcurcop = PL_curcop;
508 oldparser = PL_parser;
509 lex_start(NULL, NULL, 0);
510 oldcompcv = PL_compcv;
511 PL_compcv = NULL; /* Prevent start_subparse from setting
512 CvOUTSIDE. */
513 oldsavestack_ix = start_subparse(FALSE,0);
514 cv = PL_compcv;
515 }
516 else {
517 /* Avoid calling newXS, as it calls us, and things start to
518 get hairy. */
519 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
520 GvCV_set(gv,cv);
521 GvCVGEN(gv) = 0;
522 mro_method_changed_in(GvSTASH(gv));
523 CvISXSUB_on(cv);
524 CvXSUB(cv) = core_xsub;
525 }
526 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
527 from PL_curcop. */
528 (void)gv_fetchfile(file);
529 CvFILE(cv) = (char *)file;
530 /* XXX This is inefficient, as doing things this order causes
531 a prototype check in newATTRSUB. But we have to do
532 it this order as we need an op number before calling
533 new ATTRSUB. */
534 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 535 if (stash)
73c02f15 536 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 537 if (ampable) {
4428fb0e
TC		 538#ifdef DEBUGGING
539 CV *orig_cv = cv;
540#endif
0f8d4b5e 541 CvLVALUE_on(cv);
4428fb0e
TC		 542 /* newATTRSUB will free the CV and return NULL if we're still
543 compiling after a syntax error */
544 if ((cv = newATTRSUB_flags(
7e68c38b 545 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 546 NULL,NULL,
547 coresub_op(
548 opnum
549 ? newSVuv((UV)opnum)
550 : newSVpvn(name,len),
551 code, opnum
7e68c38b
FC		 552 ),
553 1
4428fb0e
TC		 554 )) != NULL) {
555 assert(GvCV(gv) == orig_cv);
556 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
557 && opnum != OP_UNDEF)
558 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
559 }
0f8d4b5e
FC		 560 LEAVE;
561 PL_parser = oldparser;
562 PL_curcop = oldcurcop;
563 PL_compcv = oldcompcv;
564 }
4428fb0e
TC		 565 if (cv) {
566 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
567 cv_set_call_checker(
568 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
569 );
570 SvREFCNT_dec(opnumsv);
571 }
572
0f8d4b5e
FC		 573 return gv;
574}
575
954c1994 576/*
6c53d59b
FC		 577=for apidoc gv_fetchmeth
578
579Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
580
e6919483
BF		 581=for apidoc gv_fetchmeth_sv
582
583Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
584of an SV instead of a string/length pair.
585
586=cut
587*/
588
589GV *
590Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
591{
592 char *namepv;
593 STRLEN namelen;
594 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
595 namepv = SvPV(namesv, namelen);
596 if (SvUTF8(namesv))
597 flags |= SVf_UTF8;
598 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
599}
600
601/*
602=for apidoc gv_fetchmeth_pv
603
604Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
605instead of a string/length pair.
606
607=cut
608*/
609
610GV *
611Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
612{
613 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
614 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
615}
616
617/*
618=for apidoc gv_fetchmeth_pvn
954c1994
GS		 619
620Returns the glob with the given C<name> and a defined subroutine or
621C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 622accessible via @ISA and UNIVERSAL::.
954c1994
GS		 623
624The argument C<level> should be either 0 or -1. If C<level==0>, as a
625side-effect creates a glob with the given C<name> in the given C<stash>
626which in the case of success contains an alias for the subroutine, and sets
e1a479c5 627up caching info for this glob.
954c1994 628
aae43805
FC		 629The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
630
631GV_SUPER indicates that we want to look up the method in the superclasses
632of the C<stash>.
e6919483 633
aae43805 634The
954c1994 635GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 636visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 637the GV directly; instead, you should use the method's CV, which can be
b267980d 638obtained from the GV with the C<GvCV> macro.
954c1994
GS		 639
640=cut
641*/
642
e1a479c5
BB		 643/* NOTE: No support for tied ISA */
644
79072805 645GV *
e6919483 646Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 647{
97aff369 648 dVAR;
463ee0b2 649 GV** gvp;
e1a479c5
BB		 650 AV* linear_av;
651 SV** linear_svp;
652 SV* linear_sv;
aae43805 653 HV* cstash, *cachestash;
e1a479c5
BB		 654 GV* candidate = NULL;
655 CV* cand_cv = NULL;
e1a479c5 656 GV* topgv = NULL;
bfcb3514 657 const char *hvname;
e1a479c5
BB		 658 I32 create = (level >= 0) ? 1 : 0;
659 I32 items;
e1a479c5 660 U32 topgen_cmp;
04f3bf56 661 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 662
e6919483 663 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 664
af09ea45
IK		 665 /* UNIVERSAL methods should be callable without a stash */
666 if (!stash) {
e1a479c5 667 create = 0; /* probably appropriate */
da51bb9b 668 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 669 return 0;
670 }
671
e1a479c5
BB		 672 assert(stash);
673
bfcb3514
NC		 674 hvname = HvNAME_get(stash);
675 if (!hvname)
e1a479c5 676 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 677
e1a479c5
BB		 678 assert(hvname);
679 assert(name);
463ee0b2 680
aae43805
FC		 681 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
682 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 683
dd69841b 684 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 685
aae43805
FC		 686 if (flags & GV_SUPER) {
687 if (!HvAUX(stash)->xhv_super) HvAUX(stash)->xhv_super = newHV();
688 cachestash = HvAUX(stash)->xhv_super;
689 }
690 else cachestash = stash;
691
e1a479c5 692 /* check locally for a real method or a cache entry */
aae43805
FC		 693 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
694 create);
e1a479c5
BB		 695 if(gvp) {
696 topgv = *gvp;
0f8d4b5e 697 have_gv:
e1a479c5
BB		 698 assert(topgv);
699 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 700 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 701 if ((cand_cv = GvCV(topgv))) {
702 /* If genuine method or valid cache entry, use it */
703 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
704 return topgv;
705 }
706 else {
707 /* stale cache entry, junk it and move on */
e7881358 708 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 709 GvCV_set(topgv, NULL);
710 cand_cv = NULL;
e1a479c5
BB		 711 GvCVGEN(topgv) = 0;
712 }
713 }
714 else if (GvCVGEN(topgv) == topgen_cmp) {
715 /* cache indicates no such method definitively */
716 return 0;
717 }
aae43805
FC		 718 else if (stash == cachestash
719 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 720 && strnEQ(hvname, "CORE", 4)
87566176 721 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 722 goto have_gv;
463ee0b2 723 }
79072805 724
aae43805 725 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 726 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
727 items = AvFILLp(linear_av); /* no +1, to skip over self */
728 while (items--) {
729 linear_sv = *linear_svp++;
730 assert(linear_sv);
731 cstash = gv_stashsv(linear_sv, 0);
732
dd69841b 733 if (!cstash) {
ecad31f0 734 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 735 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 736 SVfARG(linear_sv),
d0c0e7dd 737 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 738 continue;
739 }
9607fc9c 740
e1a479c5
BB		 741 assert(cstash);
742
c60dbbc3 743 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 744 if (!gvp) {
745 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
746 const char *hvname = HvNAME(cstash); assert(hvname);
747 if (strnEQ(hvname, "CORE", 4)
748 && (candidate =
87566176 749 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 750 ))
751 goto have_candidate;
752 }
753 continue;
754 }
755 else candidate = *gvp;
756 have_candidate:
e1a479c5 757 assert(candidate);
04f3bf56 758 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 759 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 760 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
761 /*
762 * Found real method, cache method in topgv if:
763 * 1. topgv has no synonyms (else inheritance crosses wires)
764 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
765 */
766 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 767 CV *old_cv = GvCV(topgv);
768 SvREFCNT_dec(old_cv);
e1a479c5 769 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 770 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 771 GvCVGEN(topgv) = topgen_cmp;
772 }
773 return candidate;
774 }
775 }
9607fc9c 776
e1a479c5
BB		 777 /* Check UNIVERSAL without caching */
778 if(level == 0 || level == -1) {
aae43805 779 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB		 780 if(candidate) {
781 cand_cv = GvCV(candidate);
782 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 783 CV *old_cv = GvCV(topgv);
784 SvREFCNT_dec(old_cv);
e1a479c5 785 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 786 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 787 GvCVGEN(topgv) = topgen_cmp;
788 }
789 return candidate;
790 }
791 }
792
793 if (topgv && GvREFCNT(topgv) == 1) {
794 /* cache the fact that the method is not defined */
795 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 796 }
797
79072805
LW		 798 return 0;
799}
800
954c1994 801/*
460e5730
FC		 802=for apidoc gv_fetchmeth_autoload
803
804This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
805parameter.
806
d21989ed 807=for apidoc gv_fetchmeth_sv_autoload
611c1e95 808
d21989ed
BF		 809Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
810of an SV instead of a string/length pair.
811
812=cut
813*/
814
815GV *
816Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
817{
818 char *namepv;
819 STRLEN namelen;
820 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
821 namepv = SvPV(namesv, namelen);
822 if (SvUTF8(namesv))
823 flags |= SVf_UTF8;
824 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
825}
826
827/*
828=for apidoc gv_fetchmeth_pv_autoload
829
830Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
831instead of a string/length pair.
832
833=cut
834*/
835
836GV *
837Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
838{
839 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
840 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
841}
842
843/*
844=for apidoc gv_fetchmeth_pvn_autoload
845
846Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ		 847Returns a glob for the subroutine.
848
849For an autoloaded subroutine without a GV, will create a GV even
850if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
851of the result may be zero.
852
d21989ed
BF		 853Currently, the only significant value for C<flags> is SVf_UTF8.
854
611c1e95
IZ		 855=cut
856*/
857
858GV *
d21989ed 859Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 860{
499321d3 861 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 862
d21989ed 863 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 864
611c1e95 865 if (!gv) {
611c1e95
IZ		 866 CV *cv;
867 GV **gvp;
868
869 if (!stash)
6136c704 870 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 871 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 872 return NULL;
d21989ed 873 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 874 return NULL;
611c1e95
IZ		 875 cv = GvCV(gv);
876 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 877 return NULL;
611c1e95
IZ		 878 /* Have an autoload */
879 if (level < 0) /* Cannot do without a stub */
d21989ed 880 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 881 gvp = (GV**)hv_fetch(stash, name,
882 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 883 if (!gvp)
6136c704 884 return NULL;
611c1e95
IZ		 885 return *gvp;
886 }
887 return gv;
888}
889
890/*
954c1994
GS		 891=for apidoc gv_fetchmethod_autoload
892
893Returns the glob which contains the subroutine to call to invoke the method
894on the C<stash>. In fact in the presence of autoloading this may be the
895glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 896already setup.
954c1994
GS		 897
898The third parameter of C<gv_fetchmethod_autoload> determines whether
899AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 900means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 901Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 902with a non-zero C<autoload> parameter.
954c1994
GS		 903
904These functions grant C<"SUPER"> token as a prefix of the method name. Note
905that if you want to keep the returned glob for a long time, you need to
906check for it being "AUTOLOAD", since at the later time the call may load a
907different subroutine due to $AUTOLOAD changing its value. Use the glob
b267980d 908created via a side effect to do this.
954c1994
GS		 909
910These functions have the same side-effects and as C<gv_fetchmeth> with
911C<level==0>. C<name> should be writable if contains C<':'> or C<'
912''>. The warning against passing the GV returned by C<gv_fetchmeth> to
b267980d 913C<call_sv> apply equally to these functions.
954c1994
GS		 914
915=cut
916*/
917
dc848c6f 918GV *
864dbfa3 919Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 920{
547bb267
NC		 921 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
922
256d1bb2
NC		 923 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
924}
925
44130a26
BF		 926GV *
927Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
928{
929 char *namepv;
930 STRLEN namelen;
931 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
932 namepv = SvPV(namesv, namelen);
933 if (SvUTF8(namesv))
934 flags |= SVf_UTF8;
935 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
936}
937
938GV *
939Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
940{
941 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
942 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
943}
944
256d1bb2
NC		 945/* Don't merge this yet, as it's likely to get a len parameter, and possibly
946 even a U32 hash */
947GV *
44130a26 948Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 949{
97aff369 950 dVAR;
eb578fdb 951 const char *nend;
c445ea15 952 const char *nsplit = NULL;
a0d0e21e 953 GV* gv;
0dae17bd 954 HV* ostash = stash;
c94593d0 955 const char * const origname = name;
ad64d0ec 956 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 957 const U32 autoload = flags & GV_AUTOLOAD;
958 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 959 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 960
44130a26 961 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 962
eff494dd 963 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 964 stash = NULL;
c9bf4021
NC		 965 else {
966 /* The only way stash can become NULL later on is if nsplit is set,
967 which in turn means that there is no need for a SVt_PVHV case
968 the error reporting code. */
969 }
b267980d 970
44130a26 971 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 972 if (*nend == '\'') {
a0d0e21e 973 nsplit = nend;
c94593d0
NC		 974 name = nend + 1;
975 }
976 else if (*nend == ':' && *(nend + 1) == ':') {
977 nsplit = nend++;
978 name = nend + 1;
979 }
a0d0e21e
LW		 980 }
981 if (nsplit) {
7edbdc6b 982 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 983 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 984 stash = CopSTASH(PL_curcop);
985 flags |= GV_SUPER;
cea2e8a9 986 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 987 origname, HvENAME_get(stash), name) );
4633a7c4 988 }
aae43805
FC		 989 else if ((nsplit - origname) >= 7 &&
990 strnEQ(nsplit - 7, "::SUPER", 7)) {
991 /* don't autovifify if ->NoSuchStash::SUPER::method */
992 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
993 if (stash) flags |= GV_SUPER;
994 }
e189a56d 995 else {
af09ea45 996 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 997 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 998 }
0dae17bd 999 ostash = stash;
4633a7c4
LW		 1000 }
1001
14d1dfbd 1002 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1003 if (!gv) {
2f6e0fe7 1004 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1005 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1006 else if (autoload)
c8416c26
BF		 1007 gv = gv_autoload_pvn(
1008 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1009 );
256d1bb2
NC		 1010 if (!gv && do_croak) {
1011 /* Right now this is exclusively for the benefit of S_method_common
1012 in pp_hot.c */
1013 if (stash) {
15e6cdd9
DG		 1014 /* If we can't find an IO::File method, it might be a call on
1015 * a filehandle. If IO:File has not been loaded, try to
1016 * require it first instead of croaking */
1017 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1018 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1019 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1020 STR_WITH_LEN("IO/File.pm"), 0,
1021 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1022 ) {
31b05a0f 1023 require_pv("IO/File.pm");
14d1dfbd 1024 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1025 if (gv)
1026 return gv;
1027 }
256d1bb2 1028 Perl_croak(aTHX_
d0c0e7dd
FC		 1029 "Can't locate object method \"%"SVf
1030 "\" via package \"%"HEKf"\"",
f937af42
BF		 1031 SVfARG(newSVpvn_flags(name, nend - name,
1032 SVs_TEMP | is_utf8)),
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 {
ecad31f0 1042 packnamesv = sv_2mortal(newSVsv(error_report));
256d1bb2
NC		 1043 }
1044
1045 Perl_croak(aTHX_
ecad31f0
BF		 1046 "Can't locate object method \"%"SVf"\" via package \"%"SVf"\""
1047 " (perhaps you forgot to load \"%"SVf"\"?)",
1048 SVfARG(newSVpvn_flags(name, nend - name,
1049 SVs_TEMP | is_utf8)),
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
1060 if (CvANON(cv))
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 1071 if (autogv)
1072 gv = autogv;
1073 }
1074 }
44a8e56a 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{
27da23d5 1101 dVAR;
44a8e56a 1102 GV* gv;
1103 CV* cv;
1104 HV* varstash;
1105 GV* vargv;
1106 SV* varsv;
c8416c26
BF		 1107 SV *packname = NULL;
1108 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1109
0fe84f7c 1110 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1111
7edbdc6b 1112 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1113 return NULL;
0dae17bd
GS		 1114 if (stash) {
1115 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1116 STRLEN packname_len = 0;
1117 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1118 packname = newSVpvn_flags(packname_ptr, packname_len,
1119 SVs_TEMP | SvUTF8(stash));
5c284bb0 1120 stash = NULL;
0dae17bd 1121 }
c8416c26
BF		 1122 else
1123 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1124 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1125 }
c8416c26 1126 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
a0714e2c 1127 return NULL;
dc848c6f 1128 cv = GvCV(gv);
1129
adb5a9ae 1130 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1131 return NULL;
ed850460 1132
dc848c6f 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),
ecad31f0
BF		 1141 "Use of inherited AUTOLOAD for non-method %"SVf"::%"SVf"() is deprecated",
1142 SVfARG(packname),
1143 SVfARG(newSVpvn_flags(name, len, SVs_TEMP | is_utf8)));
44a8e56a 1144
aed2304a 1145 if (CvISXSUB(cv)) {
bb619f37
FC		 1146 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1147 * and split that value on the last '::', pass along the same data
1148 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1149 *
1150 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1151 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1152 * type. Since SvPVX has been documented as returning the sub name
1153 * for a long time, but not as returning the prototype, we have
1154 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1155 * elsewhere.
1156 *
1157 * We put the prototype in the same allocated buffer, but after
1158 * the sub name. The SvPOK flag indicates the presence of a proto-
1159 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1160 * If both flags are on, then SvLEN is used to indicate the end of
1161 * the prototype (artificially lower than what is actually allo-
1162 * cated), at the risk of having to reallocate a few bytes unneces-
1163 * sarily--but that should happen very rarely, if ever.
1164 *
1165 * We use SvUTF8 for both prototypes and sub names, so if one is
1166 * UTF8, the other must be upgraded.
adb5a9ae 1167 */
c68d9564 1168 CvSTASH_set(cv, stash);
8fa6a409 1169 if (SvPOK(cv)) { /* Ouch! */
e7881358 1170 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1171 STRLEN ulen;
1172 const char *proto = CvPROTO(cv);
1173 assert(proto);
1174 if (SvUTF8(cv))
1175 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1176 ulen = SvCUR(tmpsv);
1177 SvCUR(tmpsv)++; /* include null in string */
1178 sv_catpvn_flags(
1179 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1180 );
1181 SvTEMP_on(tmpsv); /* Allow theft */
1182 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1183 SvTEMP_off(tmpsv);
e7881358 1184 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1185 SvLEN(cv) = SvCUR(cv) + 1;
1186 SvCUR(cv) = ulen;
1187 }
1188 else {
1189 sv_setpvn((SV *)cv, name, len);
1190 SvPOK_off(cv);
1191 if (is_utf8)
c8416c26 1192 SvUTF8_on(cv);
8fa6a409
FC		 1193 else SvUTF8_off(cv);
1194 }
1195 CvAUTOLOAD_on(cv);
adb5a9ae 1196 }
adb5a9ae 1197
44a8e56a 1198 /*
1199 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1200 * The subroutine's original name may not be "AUTOLOAD", so we don't
1201 * use that, but for lack of anything better we will use the sub's
1202 * original package to look up $AUTOLOAD.
1203 */
1204 varstash = GvSTASH(CvGV(cv));
5c7983e5 1205 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1206 ENTER;
1207
c69033f2 1208 if (!isGV(vargv)) {
04ec7e59 1209 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1210#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1211 GvSV(vargv) = newSV(0);
c69033f2
NC		 1212#endif
1213 }
3d35f11b 1214 LEAVE;
e203899d 1215 varsv = GvSVn(vargv);
4bac9ae4
CS		 1216 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1217 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1218 sv_setsv(varsv, packname);
396482e1 1219 sv_catpvs(varsv, "::");
d40bf27b
NC		 1220 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1221 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1222 sv_catpvn_flags(
1223 varsv, name, len,
5bcd1ef4 1224 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1225 );
c8416c26
BF		 1226 if (is_utf8)
1227 SvUTF8_on(varsv);
a0d0e21e
LW		 1228 return gv;
1229}
1230
44a2ac75
YO		 1231
1232/* require_tie_mod() internal routine for requiring a module
486ec47a 1233 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1234 *
1235 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1236 * "varpv" holds the name of the var, used for error messages.
1237 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1238 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1239 * are working reasonably close to as expected.
1240 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1241 * For the protection of $! to work (it is set by this routine)
1242 * the sv slot must already be magicalized.
d2c93421 1243 */
44a2ac75
YO		 1244STATIC HV*
1245S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1246{
27da23d5 1247 dVAR;
da51bb9b 1248 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1249
7918f24d
NC		 1250 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1251
0ea03996 1252 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1253 SV *module = newSVsv(namesv);
1254 char varname = *varpv; /* varpv might be clobbered by load_module,
1255 so save it. For the moment it's always
1256 a single char. */
b82b06b8 1257 const char type = varname == '[' ? '$' : '%';
d2c93421 1258 dSP;
d2c93421 1259 ENTER;
600beb2e 1260 SAVEFREESV(namesv);
44a2ac75 1261 if ( flags & 1 )
45cbc99a 1262 save_scalar(gv);
cac54379 1263 PUSHSTACKi(PERLSI_MAGIC);
45cbc99a 1264 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
cac54379 1265 POPSTACK;
da51bb9b 1266 stash = gv_stashsv(namesv, 0);
44a2ac75 1267 if (!stash)
b82b06b8
FC		 1268 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1269 type, varname, SVfARG(namesv));
45cbc99a 1270 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1271 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1272 type, varname, SVfARG(namesv), methpv);
600beb2e 1273 LEAVE;
d2c93421 1274 }
e7881358 1275 else SvREFCNT_dec_NN(namesv);
44a2ac75 1276 return stash;
d2c93421
RH		 1277}
1278
954c1994
GS		 1279/*
1280=for apidoc gv_stashpv
1281
da51bb9b 1282Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1283determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1284
1285=cut
1286*/
1287
a0d0e21e 1288HV*
864dbfa3 1289Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1290{
7918f24d 1291 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1292 return gv_stashpvn(name, strlen(name), create);
1293}
1294
bc96cb06
SH		 1295/*
1296=for apidoc gv_stashpvn
1297
da51bb9b
NC		 1298Returns a pointer to the stash for a specified package. The C<namelen>
1299parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1300to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1301created if it does not already exist. If the package does not exist and
1302C<flags> is 0 (or any other setting that does not create packages) then NULL
1303is returned.
1304
566a4718
YO		 1305Flags may be one of:
1306
1307 GV_ADD
1308 SVf_UTF8
1309 GV_NOADD_NOINIT
1310 GV_NOINIT
1311 GV_NOEXPAND
1312 GV_ADDMG
1313
1314The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH		 1315
1316=cut
1317*/
1318
dc437b57 1319HV*
da51bb9b 1320Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1321{
0cea0058 1322 char smallbuf[128];
46fc3d4c 1323 char *tmpbuf;
a0d0e21e
LW		 1324 HV *stash;
1325 GV *tmpgv;
add0ecde 1326 U32 tmplen = namelen + 2;
dc437b57 1327
7918f24d
NC		 1328 PERL_ARGS_ASSERT_GV_STASHPVN;
1329
add0ecde 1330 if (tmplen <= sizeof smallbuf)
46fc3d4c 1331 tmpbuf = smallbuf;
1332 else
add0ecde
VP		 1333 Newx(tmpbuf, tmplen, char);
1334 Copy(name, tmpbuf, namelen, char);
1335 tmpbuf[namelen] = ':';
1336 tmpbuf[namelen+1] = ':';
1337 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1338 if (tmpbuf != smallbuf)
1339 Safefree(tmpbuf);
a0d0e21e 1340 if (!tmpgv)
da51bb9b 1341 return NULL;
a0d0e21e 1342 stash = GvHV(tmpgv);
1f656fcf 1343 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1344 assert(stash);
1f656fcf 1345 if (!HvNAME_get(stash)) {
0be4d16f 1346 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1347
1348 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1349 /* If the containing stash has multiple effective
1350 names, see that this one gets them, too. */
1351 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1352 mro_package_moved(stash, NULL, tmpgv, 1);
1353 }
a0d0e21e 1354 return stash;
463ee0b2
LW		 1355}
1356
954c1994
GS		 1357/*
1358=for apidoc gv_stashsv
1359
da51bb9b 1360Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS		 1361
1362=cut
1363*/
1364
a0d0e21e 1365HV*
da51bb9b 1366Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1367{
dc437b57 1368 STRLEN len;
9d4ba2ae 1369 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC		 1370
1371 PERL_ARGS_ASSERT_GV_STASHSV;
1372
0be4d16f 1373 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW		 1374}
1375
1376
463ee0b2 1377GV *
fe9845cc 1378Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1379 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1380 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1381}
1382
1383GV *
fe9845cc 1384Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1385 STRLEN len;
77cb3b01
FC		 1386 const char * const nambeg =
1387 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1388 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1389 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1390}
1391
ad7cce9f 1392STATIC void
290a1700 1393S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1394{
1395 AV* av;
1396
1397 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1398
1399 av = GvAVn(gv);
1400 GvMULTI_on(gv);
1401 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1402 NULL, 0);
ad7cce9f
FR		 1403}
1404
7a5fd60d
NC		 1405GV *
1406Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
fe9845cc 1407 const svtype sv_type)
79072805 1408{
97aff369 1409 dVAR;
eb578fdb
KW		 1410 const char *name = nambeg;
1411 GV *gv = NULL;
79072805 1412 GV**gvp;
79072805 1413 I32 len;
eb578fdb 1414 const char *name_cursor;
c445ea15 1415 HV *stash = NULL;
add2581e 1416 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
e26df76a 1417 const I32 no_expand = flags & GV_NOEXPAND;
780a5241 1418 const I32 add = flags & ~GV_NOADD_MASK;
04f3bf56 1419 const U32 is_utf8 = flags & SVf_UTF8;
9da346da 1420 bool addmg = !!(flags & GV_ADDMG);
b3d904f3
NC		 1421 const char *const name_end = nambeg + full_len;
1422 const char *const name_em1 = name_end - 1;
5e0caaeb 1423 U32 faking_it;
79072805 1424
7918f24d
NC		 1425 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1426
fafc274c
NC		 1427 if (flags & GV_NOTQUAL) {
1428 /* Caller promised that there is no stash, so we can skip the check. */
1429 len = full_len;
1430 goto no_stash;
1431 }
1432
ecad31f0 1433 if (full_len > 2 && *name == '*' && isIDFIRST_lazy_if(name + 1, is_utf8)) {
b208e10c 1434 /* accidental stringify on a GV? */
c07a80fd 1435 name++;
b208e10c 1436 }
c07a80fd 1437
b3d904f3 1438 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
46c0ec20
FC		 1439 if (name_cursor < name_em1 &&
1440 ((*name_cursor == ':'
b3d904f3 1441 && name_cursor[1] == ':')
46c0ec20 1442 || *name_cursor == '\''))
463ee0b2 1443 {
463ee0b2 1444 if (!stash)
3280af22 1445 stash = PL_defstash;
dc437b57 1446 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1447 return NULL;
463ee0b2 1448
b3d904f3 1449 len = name_cursor - name;
088225fd 1450 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
3a5b580c
NC		 1451 const char *key;
1452 if (*name_cursor == ':') {
1453 key = name;
e771aaa9
NC		 1454 len += 2;
1455 } else {
3a5b580c 1456 char *tmpbuf;
2ae0db35 1457 Newx(tmpbuf, len+2, char);
e771aaa9
NC		 1458 Copy(name, tmpbuf, len, char);
1459 tmpbuf[len++] = ':';
1460 tmpbuf[len++] = ':';
3a5b580c 1461 key = tmpbuf;
e771aaa9 1462 }
0be4d16f 1463 gvp = (GV**)hv_fetch(stash, key, is_utf8 ? -len : len, add);
a0714e2c 1464 gv = gvp ? *gvp : NULL;
159b6efe 1465 if (gv && gv != (const GV *)&PL_sv_undef) {
6fa846a0 1466 if (SvTYPE(gv) != SVt_PVGV)
04ec7e59 1467 gv_init_pvn(gv, stash, key, len, (add & GV_ADDMULTI)|is_utf8);
6fa846a0
GS		 1468 else
1469 GvMULTI_on(gv);
1470 }
3a5b580c 1471 if (key != name)
b9d2ea5b 1472 Safefree(key);
159b6efe 1473 if (!gv || gv == (const GV *)&PL_sv_undef)
a0714e2c 1474 return NULL;
85e6fe83 1475
463ee0b2 1476 if (!(stash = GvHV(gv)))
298d6511 1477 {
99ee9762
FC		 1478 stash = GvHV(gv) = newHV();
1479 if (!HvNAME_get(stash)) {
e058c50a
FC		 1480 if (GvSTASH(gv) == PL_defstash && len == 6
1481 && strnEQ(name, "CORE", 4))
1482 hv_name_set(stash, "CORE", 4, 0);
1483 else
1484 hv_name_set(
0be4d16f 1485 stash, nambeg, name_cursor-nambeg, is_utf8
e058c50a 1486 );
99ee9762
FC		 1487 /* If the containing stash has multiple effective
1488 names, see that this one gets them, too. */
1489 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1490 mro_package_moved(stash, NULL, gv, 1);
1491 }
298d6511 1492 }
99ee9762 1493 else if (!HvNAME_get(stash))
0be4d16f 1494 hv_name_set(stash, nambeg, name_cursor - nambeg, is_utf8);
463ee0b2
LW		 1495 }
1496
b3d904f3
NC		 1497 if (*name_cursor == ':')
1498 name_cursor++;
088225fd 1499 name = name_cursor+1;
ad6bfa9d 1500 if (name == name_end)
159b6efe
NC		 1501 return gv
1502 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
79072805 1503 }
79072805 1504 }
b3d904f3 1505 len = name_cursor - name;
463ee0b2
LW		 1506
1507 /* No stash in name, so see how we can default */
1508
1509 if (!stash) {
fafc274c 1510 no_stash:
8d40577b 1511 if (len && isIDFIRST_lazy_if(name, is_utf8)) {
9607fc9c 1512 bool global = FALSE;
1513
8ccce9ae
NC		 1514 switch (len) {
1515 case 1:
18ea00d7 1516 if (*name == '_')
9d116dd7 1517 global = TRUE;
18ea00d7 1518 break;
8ccce9ae
NC		 1519 case 3:
1520 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1521 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1522 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
9d116dd7 1523 global = TRUE;
18ea00d7 1524 break;
8ccce9ae
NC		 1525 case 4:
1526 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1527 && name[3] == 'V')
9d116dd7 1528 global = TRUE;
18ea00d7 1529 break;
8ccce9ae
NC		 1530 case 5:
1531 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1532 && name[3] == 'I' && name[4] == 'N')
463ee0b2 1533 global = TRUE;
18ea00d7 1534 break;
8ccce9ae
NC		 1535 case 6:
1536 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1537 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1538 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1539 global = TRUE;
1540 break;
1541 case 7:
1542 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1543 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1544 && name[6] == 'T')
18ea00d7
NC		 1545 global = TRUE;
1546 break;
463ee0b2 1547 }
9607fc9c 1548
463ee0b2 1549 if (global)
3280af22 1550 stash = PL_defstash;
923e4eb5 1551 else if (IN_PERL_COMPILETIME) {
3280af22
NIS		 1552 stash = PL_curstash;
1553 if (add && (PL_hints & HINT_STRICT_VARS) &&
748a9306
LW		 1554 sv_type != SVt_PVCV &&
1555 sv_type != SVt_PVGV &&
4633a7c4 1556 sv_type != SVt_PVFM &&
c07a80fd 1557 sv_type != SVt_PVIO &&
70ec6265
NC		 1558 !(len == 1 && sv_type == SVt_PV &&
1559 (*name == 'a' || *name == 'b')) )
748a9306 1560 {
0be4d16f 1561 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,0);
4633a7c4 1562 if (!gvp ||
159b6efe 1563 *gvp == (const GV *)&PL_sv_undef ||
a5f75d66
AD		 1564 SvTYPE(*gvp) != SVt_PVGV)
1565 {
d4c19fe8 1566 stash = NULL;
a5f75d66 1567 }
155aba94
GS		 1568 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1569 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1570 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
4633a7c4 1571 {
ecad31f0 1572 SV* namesv = newSVpvn_flags(name, len, SVs_TEMP | is_utf8);
fe13d51d 1573 /* diag_listed_as: Variable "%s" is not imported%s */
413ff9f6
FC		 1574 Perl_ck_warner_d(
1575 aTHX_ packWARN(WARN_MISC),
ecad31f0 1576 "Variable \"%c%"SVf"\" is not imported",
4633a7c4
LW		 1577 sv_type == SVt_PVAV ? '@' :
1578 sv_type == SVt_PVHV ? '%' : '$',
ecad31f0 1579 SVfARG(namesv));
8ebc5c01 1580 if (GvCVu(*gvp))
413ff9f6
FC		 1581 Perl_ck_warner_d(
1582 aTHX_ packWARN(WARN_MISC),
ecad31f0 1583 "\t(Did you mean &%"SVf" instead?)\n", SVfARG(namesv)
413ff9f6 1584 );
d4c19fe8 1585 stash = NULL;
4633a7c4 1586 }
a0d0e21e 1587 }
85e6fe83 1588 }
463ee0b2 1589 else
1d7c1841 1590 stash = CopSTASH(PL_curcop);
463ee0b2
LW		 1591 }
1592 else
3280af22 1593 stash = PL_defstash;
463ee0b2
LW		 1594 }
1595
1596 /* By this point we should have a stash and a name */
1597
a0d0e21e 1598 if (!stash) {
49bb71ae
FC		 1599 if (add && !PL_in_clean_all) {
1600 SV * const namesv = newSVpvn_flags(name, len, is_utf8);
9d4ba2ae 1601 SV * const err = Perl_mess(aTHX_
ecad31f0 1602 "Global symbol \"%s%"SVf"\" requires explicit package name",
5a844595
GS		 1603 (sv_type == SVt_PV ? "$"
1604 : sv_type == SVt_PVAV ? "@"
1605 : sv_type == SVt_PVHV ? "%"
49bb71ae 1606 : ""), SVfARG(namesv));
e7f343b6 1607 GV *gv;
49bb71ae 1608 SvREFCNT_dec_NN(namesv);
32833930 1609 if (is_utf8)
608b3986
AE		 1610 SvUTF8_on(err);
1611 qerror(err);
76f68e9b 1612 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
e7f343b6
NC		 1613 if(!gv) {
1614 /* symbol table under destruction */
1615 return NULL;
1616 }
1617 stash = GvHV(gv);
a0d0e21e 1618 }
d7aacf4e 1619 else
a0714e2c 1620 return NULL;
a0d0e21e
LW		 1621 }
1622
1623 if (!SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1624 return NULL;
a0d0e21e 1625
0be4d16f 1626 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
23496c6e
FC		 1627 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
1628 if (addmg) gv = (GV *)newSV(0);
1629 else return NULL;
1630 }
914ecc63
FC		 1631 else gv = *gvp, addmg = 0;
1632 /* From this point on, addmg means gv has not been inserted in the
1633 symtab yet. */
1634
79072805 1635 if (SvTYPE(gv) == SVt_PVGV) {
a0d0e21e 1636 if (add) {
a5f75d66 1637 GvMULTI_on(gv);
e6066781 1638 gv_init_svtype(gv, sv_type);
ff683671
NC		 1639 /* You reach this path once the typeglob has already been created,
1640 either by the same or a different sigil. If this path didn't
1641 exist, then (say) referencing $! first, and %! second would
1642 mean that %! was not handled correctly. */
b82b06b8
FC		 1643 if (len == 1 && stash == PL_defstash) {
1644 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
44a2ac75
YO		 1645 if (*name == '!')
1646 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
45cbc99a 1647 else if (*name == '-' || *name == '+')
192b9cd1 1648 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
5b6da579 1649 } else if (sv_type == SVt_PV) {
4f650b80
NC		 1650 if (*name == '*' || *name == '#') {
1651 /* diag_listed_as: $* is no longer supported */
ff683671
NC		 1652 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
1653 WARN_SYNTAX),
4f650b80 1654 "$%c is no longer supported", *name);
5b6da579 1655 }
ff683671 1656 }
a289ef89 1657 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
d3b97530
DM		 1658 switch (*name) {
1659 case '[':
1660 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1661 break;
1a904fc8 1662#ifdef PERL_SAWAMPERSAND
d3b97530
DM		 1663 case '`':
1664 PL_sawampersand |= SAWAMPERSAND_LEFT;
1665 (void)GvSVn(gv);
1666 break;
1667 case '&':
1668 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
1669 (void)GvSVn(gv);
1670 break;
1671 case '\'':
1672 PL_sawampersand |= SAWAMPERSAND_RIGHT;
1673 (void)GvSVn(gv);
1674 break;
1a904fc8 1675#endif
d3b97530 1676 }
a289ef89 1677 }
45cbc99a 1678 }
af16de9f
FC		 1679 else if (len == 3 && sv_type == SVt_PVAV
1680 && strnEQ(name, "ISA", 3)
1681 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1682 gv_magicalize_isa(gv);
a0d0e21e 1683 }
79072805 1684 return gv;
add2581e 1685 } else if (no_init) {
23496c6e 1686 assert(!addmg);
55d729e4 1687 return gv;
e26df76a 1688 } else if (no_expand && SvROK(gv)) {
23496c6e 1689 assert(!addmg);
e26df76a 1690 return gv;
79072805 1691 }
93a17b20 1692
5e0caaeb
NC		 1693 /* Adding a new symbol.
1694 Unless of course there was already something non-GV here, in which case
1695 we want to behave as if there was always a GV here, containing some sort
1696 of subroutine.
1697 Otherwise we run the risk of creating things like GvIO, which can cause
1698 subtle bugs. eg the one that tripped up SQL::Translator */
1699
1700 faking_it = SvOK(gv);
93a17b20 1701
9b387841 1702 if (add & GV_ADDWARN)
ecad31f0 1703 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %"SVf" unexpectedly",
f1c07be4 1704 SVfARG(newSVpvn_flags(nambeg, name_end-nambeg, SVs_TEMP | is_utf8 )));
04ec7e59 1705 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
93a17b20 1706
ecad31f0
BF		 1707 if ( isIDFIRST_lazy_if(name, is_utf8)
1708 && ! (isLEXWARN_on ? ckWARN(WARN_ONCE) : (PL_dowarn & G_WARN_ON ) ) )
0453d815
PM		 1709 GvMULTI_on(gv) ;
1710
93a17b20 1711 /* set up magic where warranted */
44428a46 1712 if (stash != PL_defstash) { /* not the main stash */
5fdfd519 1713 /* We only have to check for three names here: EXPORT, ISA
4aaa4757
FC		 1714 and VERSION. All the others apply only to the main stash or to
1715 CORE (which is checked right after this). */
f4e68e82 1716 if (len > 2) {
b464bac0 1717 const char * const name2 = name + 1;
cc4c2da6 1718 switch (*name) {
cc4c2da6
NC		 1719 case 'E':
1720 if (strnEQ(name2, "XPORT", 5))
1721 GvMULTI_on(gv);
1722 break;
1723 case 'I':
44428a46 1724 if (strEQ(name2, "SA"))
290a1700 1725 gv_magicalize_isa(gv);
cc4c2da6 1726 break;
44428a46
FC		 1727 case 'V':
1728 if (strEQ(name2, "ERSION"))
1729 GvMULTI_on(gv);
1730 break;
4aaa4757
FC		 1731 default:
1732 goto try_core;
1733 }
23496c6e 1734 goto add_magical_gv;
4aaa4757
FC		 1735 }
1736 try_core:
1737 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1738 /* Avoid null warning: */
1739 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1740 if (strnEQ(stashname, "CORE", 4))
1741 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1742 }
1743 }
1744 else if (len > 1) {
1745#ifndef EBCDIC
1746 if (*name > 'V' ) {
1747 NOOP;
1748 /* Nothing else to do.
1749 The compiler will probably turn the switch statement into a
1750 branch table. Make sure we avoid even that small overhead for
1751 the common case of lower case variable names. */
1752 } else
1753#endif
1754 {
1755 const char * const name2 = name + 1;
1756 switch (*name) {
1757 case 'A':
1758 if (strEQ(name2, "RGV")) {
1759 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1760 }
1761 else if (strEQ(name2, "RGVOUT")) {
1762 GvMULTI_on(gv);
1763 }
1764 break;
1765 case 'E':
1766 if (strnEQ(name2, "XPORT", 5))
1767 GvMULTI_on(gv);
1768 break;
1769 case 'I':
1770 if (strEQ(name2, "SA")) {
290a1700 1771 gv_magicalize_isa(gv);
44428a46
FC		 1772 }
1773 break;
cc4c2da6
NC		 1774 case 'S':
1775 if (strEQ(name2, "IG")) {
1776 HV *hv;
1777 I32 i;
d525a7b2
NC		 1778 if (!PL_psig_name) {
1779 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1780 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1781 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1782 } else {
1783 /* I think that the only way to get here is to re-use an
1784 embedded perl interpreter, where the previous
1785 use didn't clean up fully because
1786 PL_perl_destruct_level was 0. I'm not sure that we
1787 "support" that, in that I suspect in that scenario
1788 there are sufficient other garbage values left in the
1789 interpreter structure that something else will crash
1790 before we get here. I suspect that this is one of
1791 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1792 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1793 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1794 }
1795 GvMULTI_on(gv);
1796 hv = GvHVn(gv);
a0714e2c 1797 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1798 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1799 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1800 if (init)
1801 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1802 }
1803 }
1804 break;
1805 case 'V':
1806 if (strEQ(name2, "ERSION"))
1807 GvMULTI_on(gv);
1808 break;
e5218da5
GA		 1809 case '\003': /* $^CHILD_ERROR_NATIVE */
1810 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1811 goto magicalize;
1812 break;
cc4c2da6
NC		 1813 case '\005': /* $^ENCODING */
1814 if (strEQ(name2, "NCODING"))
1815 goto magicalize;
1816 break;
9ebf26ad
FR		 1817 case '\007': /* $^GLOBAL_PHASE */
1818 if (strEQ(name2, "LOBAL_PHASE"))
1819 goto ro_magicalize;
1820 break;
8561ea1d
FC		 1821 case '\014': /* $^LAST_FH */
1822 if (strEQ(name2, "AST_FH"))
1823 goto ro_magicalize;
1824 break;
cde0cee5
YO		 1825 case '\015': /* $^MATCH */
1826 if (strEQ(name2, "ATCH"))
2fdbfb4d 1827 goto magicalize;
cc4c2da6
NC		 1828 case '\017': /* $^OPEN */
1829 if (strEQ(name2, "PEN"))
1830 goto magicalize;
1831 break;
cde0cee5
YO		 1832 case '\020': /* $^PREMATCH $^POSTMATCH */
1833 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
9ebf26ad
FR		 1834 goto magicalize;
1835 break;
cc4c2da6
NC		 1836 case '\024': /* ${^TAINT} */
1837 if (strEQ(name2, "AINT"))
1838 goto ro_magicalize;
1839 break;
7cebcbc0 1840 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1841 if (strEQ(name2, "NICODE"))
cc4c2da6 1842 goto ro_magicalize;
a0288114 1843 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1844 goto ro_magicalize;
e07ea26a
NC		 1845 if (strEQ(name2, "TF8CACHE"))
1846 goto magicalize;
cc4c2da6
NC		 1847 break;
1848 case '\027': /* $^WARNING_BITS */
1849 if (strEQ(name2, "ARNING_BITS"))
1850 goto magicalize;
1851 break;
1852 case '1':
1853 case '2':
1854 case '3':
1855 case '4':
1856 case '5':
1857 case '6':
1858 case '7':
1859 case '8':
1860 case '9':
85e6fe83 1861 {
2fdbfb4d
AB		 1862 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1863 this test */
1864 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC		 1865 const char *end = name + len;
1866 while (--end > name) {
23496c6e 1867 if (!isDIGIT(*end)) goto add_magical_gv;
cc4c2da6 1868 }
2fdbfb4d 1869 goto magicalize;
1d7c1841 1870 }
dc437b57 1871 }
93a17b20 1872 }
392db708
NC		 1873 } else {
1874 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1875 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1876 switch (*name) {
6361f656
AB		 1877 case '&': /* $& */
1878 case '`': /* $` */
1879 case '\'': /* $' */
1a904fc8 1880#ifdef PERL_SAWAMPERSAND
a289ef89 1881 if (!(
cc4c2da6
NC		 1882 sv_type == SVt_PVAV ||
1883 sv_type == SVt_PVHV ||
1884 sv_type == SVt_PVCV ||
1885 sv_type == SVt_PVFM ||
1886 sv_type == SVt_PVIO
d3b97530
DM		 1887 )) { PL_sawampersand |=
1888 (*name == '`')
1889 ? SAWAMPERSAND_LEFT
1890 : (*name == '&')
1891 ? SAWAMPERSAND_MIDDLE
1892 : SAWAMPERSAND_RIGHT;
1893 }
1a904fc8 1894#endif
2fdbfb4d 1895 goto magicalize;
cc4c2da6 1896
6361f656 1897 case ':': /* $: */
c69033f2 1898 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 1899 goto magicalize;
1900
6361f656 1901 case '?': /* $? */
ff0cee69 1902#ifdef COMPLEX_STATUS
c69033f2 1903 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1904#endif
cc4c2da6 1905 goto magicalize;
ff0cee69 1906
6361f656 1907 case '!': /* $! */
67261566 1908 GvMULTI_on(gv);
44a2ac75 1909 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1910
ad64d0ec 1911 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1912
44a2ac75 1913 /* magicalization must be done before require_tie_mod is called */
67261566 1914 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd
FC		 1915 {
1916 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1917 addmg = 0;
44a2ac75 1918 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
ffdb8bcd 1919 }
d2c93421 1920
6cef1e77 1921 break;
6361f656
AB		 1922 case '-': /* $- */
1923 case '+': /* $+ */
44a2ac75
YO		 1924 GvMULTI_on(gv); /* no used once warnings here */
1925 {
44a2ac75 1926 AV* const av = GvAVn(gv);
ad64d0ec 1927 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1928
ad64d0ec
NC		 1929 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1930 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1931 if (avc)
44a2ac75 1932 SvREADONLY_on(GvSVn(gv));
44a2ac75 1933 SvREADONLY_on(av);
67261566
YO		 1934
1935 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4
FC		 1936 {
1937 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1938 addmg = 0;
192b9cd1 1939 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
213084e4 1940 }
67261566 1941
80305961 1942 break;
cc4c2da6 1943 }
6361f656
AB		 1944 case '*': /* $* */
1945 case '#': /* $# */
9b387841 1946 if (sv_type == SVt_PV)
4f650b80 1947 /* diag_listed_as: $* is no longer supported */
9b387841 1948 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1949 "$%c is no longer supported", *name);
8ae1fe26 1950 break;
b3ca2e83
NC		 1951 case '\010': /* $^H */
1952 {
1953 HV *const hv = GvHVn(gv);
1954 hv_magic(hv, NULL, PERL_MAGIC_hints);
1955 }
1956 goto magicalize;
b82b06b8 1957 case '[': /* $[ */
7d69d4a6 1958 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1959 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8
FC		 1960 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1961 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1962 addmg = 0;
1963 }
7d69d4a6 1964 else goto magicalize;
b82b06b8 1965 break;
cc4c2da6 1966 case '\023': /* $^S */
2fdbfb4d
AB		 1967 ro_magicalize:
1968 SvREADONLY_on(GvSVn(gv));
1969 /* FALL THROUGH */
6361f656
AB		 1970 case '0': /* $0 */
1971 case '1': /* $1 */
1972 case '2': /* $2 */
1973 case '3': /* $3 */
1974 case '4': /* $4 */
1975 case '5': /* $5 */
1976 case '6': /* $6 */
1977 case '7': /* $7 */
1978 case '8': /* $8 */
1979 case '9': /* $9 */
6361f656
AB		 1980 case '^': /* $^ */
1981 case '~': /* $~ */
1982 case '=': /* $= */
1983 case '%': /* $% */
1984 case '.': /* $. */
1985 case '(': /* $( */
1986 case ')': /* $) */
1987 case '<': /* $< */
1988 case '>': /* $> */
1989 case '\\': /* $\ */
1990 case '/': /* $/ */
4505a31f 1991 case '|': /* $| */
9cdac2a2 1992 case '$': /* $$ */
cc4c2da6
NC		 1993 case '\001': /* $^A */
1994 case '\003': /* $^C */
1995 case '\004': /* $^D */
1996 case '\005': /* $^E */
1997 case '\006': /* $^F */
cc4c2da6
NC		 1998 case '\011': /* $^I, NOT \t in EBCDIC */
1999 case '\016': /* $^N */
2000 case '\017': /* $^O */
2001 case '\020': /* $^P */
2002 case '\024': /* $^T */
2003 case '\027': /* $^W */
2004 magicalize:
ad64d0ec 2005 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2006 break;
e521374c 2007
cc4c2da6 2008 case '\014': /* $^L */
76f68e9b 2009 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2010 break;
6361f656 2011 case ';': /* $; */
76f68e9b 2012 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2013 break;
6361f656 2014 case ']': /* $] */
cc4c2da6 2015 {
3638bf15 2016 SV * const sv = GvSV(gv);
d7aa5382 2017 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2018 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2019 GvSV(gv) = vnumify(PL_patchlevel);
2020 SvREADONLY_on(GvSV(gv));
2021 SvREFCNT_dec(sv);
93a17b20
LW		 2022 }
2023 break;
cc4c2da6
NC		 2024 case '\026': /* $^V */
2025 {
3638bf15 2026 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2027 GvSV(gv) = new_version(PL_patchlevel);
2028 SvREADONLY_on(GvSV(gv));
2029 SvREFCNT_dec(sv);
16070b82
GS		 2030 }
2031 break;
cc4c2da6 2032 }
79072805 2033 }
23496c6e
FC		 2034 add_magical_gv:
2035 if (addmg) {
2036 if (GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv) || (
2037 GvSV(gv) && (SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv)))
2038 ))
0f43181e 2039 (void)hv_store(stash,name,len,(SV *)gv,0);
e7881358 2040 else SvREFCNT_dec_NN(gv), gv = NULL;
23496c6e 2041 }
e6066781 2042 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2043 return gv;
79072805
LW		 2044}
2045
2046void
35a4481c 2047Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2048{
ed60a868 2049 const char *name;
35a4481c 2050 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2051
2052 PERL_ARGS_ASSERT_GV_FULLNAME4;
2053
666ea192 2054 sv_setpv(sv, prefix ? prefix : "");
a0288114 2055
52a6327b 2056 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2057 const STRLEN len = HvNAMELEN(hv);
2058 if (keepmain || strnNE(name, "main", len)) {
2059 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2060 sv_catpvs(sv,"::");
ed60a868 2061 }
43693395 2062 }
ed60a868 2063 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2064 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2065}
2066
2067void
35a4481c 2068Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2069{
099be4f1 2070 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2071
2072 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2073
46c461b5 2074 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2075}
2076
79072805 2077void
1146e912 2078Perl_gv_check(pTHX_ const HV *stash)
79072805 2079{
97aff369 2080 dVAR;
eb578fdb 2081 I32 i;
463ee0b2 2082
7918f24d
NC		 2083 PERL_ARGS_ASSERT_GV_CHECK;
2084
8990e307
LW		 2085 if (!HvARRAY(stash))
2086 return;
a0d0e21e 2087 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2088 const HE *entry;
dc437b57 2089 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2090 GV *gv;
b7787f18 2091 HV *hv;
dc437b57 2092 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2093 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2094 {
19b6c847 2095 if (hv != PL_defstash && hv != stash)
a0d0e21e
LW		 2096 gv_check(hv); /* nested package */
2097 }
ecad31f0
BF		 2098 else if ( *HeKEY(entry) != '_'
2099 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2100 const char *file;
159b6efe 2101 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2102 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2103 continue;
1d7c1841 2104 file = GvFILE(gv);
1d7c1841
GS		 2105 CopLINE_set(PL_curcop, GvLINE(gv));
2106#ifdef USE_ITHREADS
dd374669 2107 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1d7c1841 2108#else
9bde8eb0
NC		 2109 CopFILEGV(PL_curcop)
2110 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1d7c1841 2111#endif
9014280d 2112 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2113 "Name \"%"HEKf"::%"HEKf
2114 "\" used only once: possible typo",
2115 HEKfARG(HvNAME_HEK(stash)),
2116 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2117 }
79072805
LW		 2118 }
2119 }
2120}
2121
2122GV *
9cc50d5b 2123Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2124{
97aff369 2125 dVAR;
9cc50d5b 2126 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
7918f24d 2127
9cc50d5b
BF		 2128 return gv_fetchpv(Perl_form(aTHX_ "%"SVf"::_GEN_%ld",
2129 SVfARG(newSVpvn_flags(pack, strlen(pack),
2130 SVs_TEMP | flags)),
2131 (long)PL_gensym++),
2132 GV_ADD, SVt_PVGV);
79072805
LW		 2133}
2134
2135/* hopefully this is only called on local symbol table entries */
2136
2137GP*
864dbfa3 2138Perl_gp_ref(pTHX_ GP *gp)
79072805 2139{
97aff369 2140 dVAR;
1d7c1841 2141 if (!gp)
d4c19fe8 2142 return NULL;
79072805 2143 gp->gp_refcnt++;
44a8e56a 2144 if (gp->gp_cv) {
2145 if (gp->gp_cvgen) {
e1a479c5
BB		 2146 /* If the GP they asked for a reference to contains
2147 a method cache entry, clear it first, so that we
2148 don't infect them with our cached entry */
e7881358 2149 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2150 gp->gp_cv = NULL;
44a8e56a 2151 gp->gp_cvgen = 0;
2152 }
44a8e56a 2153 }
79072805 2154 return gp;
79072805
LW		 2155}
2156
2157void
864dbfa3 2158Perl_gp_free(pTHX_ GV *gv)
79072805 2159{
97aff369 2160 dVAR;
79072805 2161 GP* gp;
b0d55c99 2162 int attempts = 100;
79072805 2163
f7877b28 2164 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2165 return;
f248d071 2166 if (gp->gp_refcnt == 0) {
9b387841
NC		 2167 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2168 "Attempt to free unreferenced glob pointers"
2169 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2170 return;
2171 }
748a9306
LW		 2172 if (--gp->gp_refcnt > 0) {
2173 if (gp->gp_egv == gv)
2174 gp->gp_egv = 0;
c43ae56f 2175 GvGP_set(gv, NULL);
79072805 2176 return;
748a9306 2177 }
79072805 2178
b0d55c99
FC		 2179 while (1) {
2180 /* Copy and null out all the glob slots, so destructors do not see
2181 freed SVs. */
2182 HEK * const file_hek = gp->gp_file_hek;
2183 SV * const sv = gp->gp_sv;
2184 AV * const av = gp->gp_av;
2185 HV * const hv = gp->gp_hv;
2186 IO * const io = gp->gp_io;
2187 CV * const cv = gp->gp_cv;
2188 CV * const form = gp->gp_form;
2189
2190 gp->gp_file_hek = NULL;
2191 gp->gp_sv = NULL;
2192 gp->gp_av = NULL;
2193 gp->gp_hv = NULL;
2194 gp->gp_io = NULL;
2195 gp->gp_cv = NULL;
2196 gp->gp_form = NULL;
2197
2198 if (file_hek)
2199 unshare_hek(file_hek);
2200
2201 SvREFCNT_dec(sv);
2202 SvREFCNT_dec(av);
2203 /* FIXME - another reference loop GV -> symtab -> GV ?
2204 Somehow gp->gp_hv can end up pointing at freed garbage. */
2205 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2206 const HEK *hvname_hek = HvNAME_HEK(hv);
103f5a36 2207 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", hvname_hek));
c2242065
BF		 2208 if (PL_stashcache && hvname_hek)
2209 (void)hv_delete(PL_stashcache, HEK_KEY(hvname_hek),
2210 (HEK_UTF8(hvname_hek) ? -HEK_LEN(hvname_hek) : HEK_LEN(hvname_hek)),
2211 G_DISCARD);
b0d55c99
FC		 2212 SvREFCNT_dec(hv);
2213 }
2214 SvREFCNT_dec(io);
2215 SvREFCNT_dec(cv);
2216 SvREFCNT_dec(form);
2217
2218 if (!gp->gp_file_hek
2219 && !gp->gp_sv
2220 && !gp->gp_av
2221 && !gp->gp_hv
2222 && !gp->gp_io
2223 && !gp->gp_cv
2224 && !gp->gp_form) break;
2225
2226 if (--attempts == 0) {
2227 Perl_die(aTHX_
2228 "panic: gp_free failed to free glob pointer - "
2229 "something is repeatedly re-creating entries"
2230 );
2231 }
13207a71 2232 }
748a9306 2233
79072805 2234 Safefree(gp);
c43ae56f 2235 GvGP_set(gv, NULL);
79072805
LW		 2236}
2237
d460ef45
NIS		 2238int
2239Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2240{
53c1dcc0
AL		 2241 AMT * const amtp = (AMT*)mg->mg_ptr;
2242 PERL_UNUSED_ARG(sv);
dd374669 2243
7918f24d
NC		 2244 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2245
d460ef45
NIS		 2246 if (amtp && AMT_AMAGIC(amtp)) {
2247 int i;
2248 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2249 CV * const cv = amtp->table[i];
b37c2d43 2250 if (cv) {
e7881358 2251 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2252 amtp->table[i] = NULL;
d460ef45
NIS		 2253 }
2254 }
2255 }
2256 return 0;
2257}
2258
a0d0e21e 2259/* Updates and caches the CV's */
c3a9a790
RGS		 2260/* Returns:
2261 * 1 on success and there is some overload
2262 * 0 if there is no overload
2263 * -1 if some error occurred and it couldn't croak
2264 */
a0d0e21e 2265
c3a9a790 2266int
242f8760 2267Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2268{
97aff369 2269 dVAR;
ad64d0ec 2270 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2271 AMT amt;
9b439311 2272 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2273 U32 newgen;
a0d0e21e 2274
7918f24d
NC		 2275 PERL_ARGS_ASSERT_GV_AMUPDATE;
2276
9b439311 2277 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2278 if (mg) {
2279 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2280 if (amtp->was_ok_sub == newgen) {
8c34e50d 2281 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2282 }
ad64d0ec 2283 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2284 }
a0d0e21e 2285
bfcb3514 2286 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2287
d460ef45 2288 Zero(&amt,1,AMT);
e1a479c5 2289 amt.was_ok_sub = newgen;
a6006777 2290 amt.fallback = AMGfallNO;
2291 amt.flags = 0;
2292
a6006777 2293 {
8c34e50d
FC		 2294 int filled = 0;
2295 int i;
a6006777 2296
3866ea3b 2297 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2298
89ffc314 2299 /* Try to find via inheritance. */
e6919483 2300 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2301 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2302 CV* cv;
89ffc314
IZ		 2303
2304 if (!gv)
3866ea3b
FC		 2305 {
2306 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2307 goto no_table;
3866ea3b
FC		 2308 }
2309#ifdef PERL_DONT_CREATE_GVSV
2310 else if (!sv) {
6f207bd3 2311 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2312 }
2313#endif
79c9643d
JL		 2314 else if (SvTRUE(sv))
2315 /* don't need to set overloading here because fallback => 1
2316 * is the default setting for classes without overloading */
89ffc314 2317 amt.fallback=AMGfallYES;
79c9643d
JL		 2318 else if (SvOK(sv)) {
2319 amt.fallback=AMGfallNEVER;
386a5489 2320 filled = 1;
386a5489 2321 }
79c9643d 2322 else {
386a5489 2323 filled = 1;
386a5489 2324 }
a6006777 2325
8c34e50d 2326 for (i = 1; i < NofAMmeth; i++) {
6136c704 2327 const char * const cooky = PL_AMG_names[i];
32251b26 2328 /* Human-readable form, for debugging: */
8c34e50d 2329 const char * const cp = AMG_id2name(i);
d279ab82 2330 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2331
a0288114 2332 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2333 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2334 /* don't fill the cache while looking up!
2335 Creation of inheritance stubs in intermediate packages may
2336 conflict with the logic of runtime method substitution.
2337 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2338 then we could have created stubs for "(+0" in A and C too.
2339 But if B overloads "bool", we may want to use it for
2340 numifying instead of C's "+0". */
8c34e50d 2341 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2342 cv = 0;
89ffc314 2343 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC		 2344 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2345 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2346 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2347 && strEQ(hvname, "overload")) {
611c1e95
IZ		 2348 /* This is a hack to support autoloading..., while
2349 knowing *which* methods were declared as overloaded. */
44a8e56a 2350 /* GvSV contains the name of the method. */
6136c704 2351 GV *ngv = NULL;
c69033f2 2352 SV *gvsv = GvSV(gv);
a0288114
AL		 2353
2354 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2355 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2356 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2357 if (!gvsv || !SvPOK(gvsv)
7f415459 2358 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2359 {
a0288114 2360 /* Can be an import stub (created by "can"). */
242f8760 2361 if (destructing) {
c3a9a790 2362 return -1;
242f8760
RGS		 2363 }
2364 else {
d66cca07
BF		 2365 const SV * const name = (gvsv && SvPOK(gvsv))
2366 ? gvsv
2367 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2368 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2369 Perl_croak(aTHX_ "%s method \"%"SVf256
2370 "\" overloading \"%s\" "\
d0c0e7dd 2371 "in package \"%"HEKf256"\"",
242f8760
RGS		 2372 (GvCVGEN(gv) ? "Stub found while resolving"
2373 : "Can't resolve"),
d66cca07 2374 SVfARG(name), cp,
d0c0e7dd 2375 HEKfARG(
d66cca07 2376 HvNAME_HEK(stash)
d0c0e7dd 2377 ));
242f8760 2378 }
44a8e56a 2379 }
dc848c6f 2380 cv = GvCV(gv = ngv);
f0e9f182 2381 }
44a8e56a 2382 }
b464bac0 2383 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2384 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2385 GvNAME(CvGV(cv))) );
2386 filled = 1;
611c1e95 2387 } else if (gv) { /* Autoloaded... */
ea726b52 2388 cv = MUTABLE_CV(gv);
611c1e95 2389 filled = 1;
44a8e56a 2390 }
ea726b52 2391 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
a0d0e21e 2392 }
a0d0e21e 2393 if (filled) {
a6006777 2394 AMT_AMAGIC_on(&amt);
ad64d0ec 2395 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2396 (char*)&amt, sizeof(AMT));
8c34e50d 2397 return TRUE;
a0d0e21e
LW		 2398 }
2399 }
a6006777 2400 /* Here we have no table: */
8c34e50d 2401 no_table:
a6006777 2402 AMT_AMAGIC_off(&amt);
ad64d0ec 2403 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2404 (char*)&amt, sizeof(AMTS));
c3a9a790 2405 return 0;
a0d0e21e
LW		 2406}
2407
32251b26
IZ		 2408
2409CV*
2410Perl_gv_handler(pTHX_ HV *stash, I32 id)
2411{
97aff369 2412 dVAR;
3f8f4626 2413 MAGIC *mg;
32251b26 2414 AMT *amtp;
e1a479c5 2415 U32 newgen;
9b439311 2416 struct mro_meta* stash_meta;
32251b26 2417
bfcb3514 2418 if (!stash || !HvNAME_get(stash))
601f1833 2419 return NULL;
e1a479c5 2420
9b439311
BB		 2421 stash_meta = HvMROMETA(stash);
2422 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2423
ad64d0ec 2424 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2425 if (!mg) {
2426 do_update:
8c34e50d 2427 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2428 return NULL;
ad64d0ec 2429 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2430 }
a9fd4e40 2431 assert(mg);
32251b26 2432 amtp = (AMT*)mg->mg_ptr;
66978156 2433 if ( amtp->was_ok_sub != newgen )
32251b26 2434 goto do_update;
3ad83ce7 2435 if (AMT_AMAGIC(amtp)) {
b7787f18 2436 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2437 if (ret && isGV(ret)) { /* Autoloading stab */
2438 /* Passing it through may have resulted in a warning
2439 "Inherited AUTOLOAD for a non-method deprecated", since
2440 our caller is going through a function call, not a method call.
2441 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2442 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2443
2444 if (gv && GvCV(gv))
2445 return GvCV(gv);
2446 }
2447 return ret;
2448 }
a0288114 2449
601f1833 2450 return NULL;
32251b26
IZ		 2451}
2452
2453
6f1401dc
DM		 2454/* Implement tryAMAGICun_MG macro.
2455 Do get magic, then see if the stack arg is overloaded and if so call it.
2456 Flags:
2457 AMGf_set return the arg using SETs rather than assigning to
2458 the targ
2459 AMGf_numeric apply sv_2num to the stack arg.
2460*/
2461
2462bool
2463Perl_try_amagic_un(pTHX_ int method, int flags) {
2464 dVAR;
2465 dSP;
2466 SV* tmpsv;
2467 SV* const arg = TOPs;
2468
2469 SvGETMAGIC(arg);
2470
9f8bf298
NC		 2471 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2472 AMGf_noright | AMGf_unary))) {
6f1401dc
DM		 2473 if (flags & AMGf_set) {
2474 SETs(tmpsv);
2475 }
2476 else {
2477 dTARGET;
2478 if (SvPADMY(TARG)) {
2479 sv_setsv(TARG, tmpsv);
2480 SETTARG;
2481 }
2482 else
2483 SETs(tmpsv);
2484 }
2485 PUTBACK;
2486 return TRUE;
2487 }
2488
2489 if ((flags & AMGf_numeric) && SvROK(arg))
2490 *sp = sv_2num(arg);
2491 return FALSE;
2492}
2493
2494
2495/* Implement tryAMAGICbin_MG macro.
2496 Do get magic, then see if the two stack args are overloaded and if so
2497 call it.
2498 Flags:
2499 AMGf_set return the arg using SETs rather than assigning to
2500 the targ
2501 AMGf_assign op may be called as mutator (eg +=)
2502 AMGf_numeric apply sv_2num to the stack arg.
2503*/
2504
2505bool
2506Perl_try_amagic_bin(pTHX_ int method, int flags) {
2507 dVAR;
2508 dSP;
2509 SV* const left = TOPm1s;
2510 SV* const right = TOPs;
2511
2512 SvGETMAGIC(left);
2513 if (left != right)
2514 SvGETMAGIC(right);
2515
2516 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2517 SV * const tmpsv = amagic_call(left, right, method,
2518 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2519 if (tmpsv) {
2520 if (flags & AMGf_set) {
2521 (void)POPs;
2522 SETs(tmpsv);
2523 }
2524 else {
2525 dATARGET;
2526 (void)POPs;
2527 if (opASSIGN || SvPADMY(TARG)) {
2528 sv_setsv(TARG, tmpsv);
2529 SETTARG;
2530 }
2531 else
2532 SETs(tmpsv);
2533 }
2534 PUTBACK;
2535 return TRUE;
2536 }
2537 }
75ea7a12
FC		 2538 if(left==right && SvGMAGICAL(left)) {
2539 SV * const left = sv_newmortal();
2540 *(sp-1) = left;
2541 /* Print the uninitialized warning now, so it includes the vari-
2542 able name. */
2543 if (!SvOK(right)) {
2544 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2545 sv_setsv_flags(left, &PL_sv_no, 0);
2546 }
2547 else sv_setsv_flags(left, right, 0);
2548 SvGETMAGIC(right);
2549 }
6f1401dc 2550 if (flags & AMGf_numeric) {
75ea7a12
FC		 2551 if (SvROK(TOPm1s))
2552 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2553 if (SvROK(right))
2554 *sp = sv_2num(right);
2555 }
2556 return FALSE;
2557}
2558
25a9ffce
NC		 2559SV *
2560Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2561 SV *tmpsv = NULL;
2562
2563 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2564
2565 while (SvAMAGIC(ref) &&
2566 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2567 AMGf_noright | AMGf_unary))) {
2568 if (!SvROK(tmpsv))
2569 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2570 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2571 /* Bail out if it returns us the same reference. */
2572 return tmpsv;
2573 }
2574 ref = tmpsv;
2575 }
2576 return tmpsv ? tmpsv : ref;
2577}
6f1401dc 2578
8d569291
FC		 2579bool
2580Perl_amagic_is_enabled(pTHX_ int method)
2581{
2582 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2583
2584 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2585
2586 if ( !lex_mask || !SvOK(lex_mask) )
2587 /* overloading lexically disabled */
2588 return FALSE;
2589 else if ( lex_mask && SvPOK(lex_mask) ) {
2590 /* we have an entry in the hints hash, check if method has been
2591 * masked by overloading.pm */
2592 STRLEN len;
2593 const int offset = method / 8;
2594 const int bit = method % 8;
2595 char *pv = SvPV(lex_mask, len);
2596
2597 /* Bit set, so this overloading operator is disabled */
2598 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2599 return FALSE;
2600 }
2601 return TRUE;
2602}
2603
a0d0e21e 2604SV*
864dbfa3 2605Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2606{
27da23d5 2607 dVAR;
b267980d 2608 MAGIC *mg;
9c5ffd7c 2609 CV *cv=NULL;
a0d0e21e 2610 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2611 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 2612 int off = 0, off1, lr = 0, notfound = 0;
2613 int postpr = 0, force_cpy = 0;
2614 int assign = AMGf_assign & flags;
2615 const int assignshift = assign ? 1 : 0;
bf5522a1 2616 int use_default_op = 0;
67288365 2617 int force_scalar = 0;
497b47a8
JH		 2618#ifdef DEBUGGING
2619 int fl=0;
497b47a8 2620#endif
25716404 2621 HV* stash=NULL;
7918f24d
NC		 2622
2623 PERL_ARGS_ASSERT_AMAGIC_CALL;
2624
e46c382e 2625 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2626 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 2627 }
2628
a0d0e21e 2629 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2630 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2631 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2632 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2633 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2634 : NULL))
b267980d 2635 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 2636 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2637 * usual method */
497b47a8
JH		 2638 (
2639#ifdef DEBUGGING
2640 fl = 1,
a0288114 2641#endif
497b47a8 2642 cv = cvp[off=method])))) {
a0d0e21e
LW		 2643 lr = -1; /* Call method for left argument */
2644 } else {
2645 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2646 int logic;
2647
2648 /* look for substituted methods */
ee239bfe 2649 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 2650 switch (method) {
2651 case inc_amg:
ee239bfe
IZ		 2652 force_cpy = 1;
2653 if ((cv = cvp[off=add_ass_amg])
2654 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2655 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2656 }
2657 break;
2658 case dec_amg:
ee239bfe
IZ		 2659 force_cpy = 1;
2660 if ((cv = cvp[off = subtr_ass_amg])
2661 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2662 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2663 }
2664 break;
2665 case bool__amg:
2666 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2667 break;
2668 case numer_amg:
2669 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2670 break;
2671 case string_amg:
2672 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2673 break;
b7787f18
AL		 2674 case not_amg:
2675 (void)((cv = cvp[off=bool__amg])
2676 || (cv = cvp[off=numer_amg])
2677 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 2678 if (cv)
2679 postpr = 1;
b7787f18 2680 break;
748a9306
LW		 2681 case copy_amg:
2682 {
76e3520e
GS		 2683 /*
2684 * SV* ref causes confusion with the interpreter variable of
2685 * the same name
2686 */
890ce7af 2687 SV* const tmpRef=SvRV(left);
76e3520e 2688 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 2689 /*
2690 * Just to be extra cautious. Maybe in some
2691 * additional cases sv_setsv is safe, too.
2692 */
890ce7af 2693 SV* const newref = newSVsv(tmpRef);
748a9306 2694 SvOBJECT_on(newref);
a1cd65be
FC		 2695 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2696 delegate to the stash. */
85fbaab2 2697 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 2698 return newref;
2699 }
2700 }
2701 break;
a0d0e21e 2702 case abs_amg:
b267980d 2703 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2704 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2705 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2706 if (off1==lt_amg) {
890ce7af 2707 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2708 lt_amg,AMGf_noright);
2709 logic = SvTRUE(lessp);
2710 } else {
890ce7af 2711 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2712 ncmp_amg,AMGf_noright);
2713 logic = (SvNV(lessp) < 0);
2714 }
2715 if (logic) {
2716 if (off==subtr_amg) {
2717 right = left;
748a9306 2718 left = nullsv;
a0d0e21e
LW		 2719 lr = 1;
2720 }
2721 } else {
2722 return left;
2723 }
2724 }
2725 break;
2726 case neg_amg:
155aba94 2727 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 2728 right = left;
2729 left = sv_2mortal(newSViv(0));
2730 lr = 1;
2731 }
2732 break;
f216259d 2733 case int_amg:
f5284f61 2734 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2735 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2736 case regexp_amg:
b267980d
NIS		 2737 /* FAIL safe */
2738 return NULL; /* Delegate operation to standard mechanisms. */
2739 break;
f5284f61
IZ		 2740 case to_sv_amg:
2741 case to_av_amg:
2742 case to_hv_amg:
2743 case to_gv_amg:
2744 case to_cv_amg:
2745 /* FAIL safe */
b267980d 2746 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2747 break;
a0d0e21e
LW		 2748 default:
2749 goto not_found;
2750 }
2751 if (!cv) goto not_found;
2752 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2753 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2754 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2755 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2756 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2757 : NULL))
69815d08
RS		 2758 && (cv = cvp[off=method])) { /* Method for right
2759 * argument found */
2760 lr=1;
bf5522a1
MB		 2761 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2762 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 2763 && !(flags & AMGf_unary)) {
2764 /* We look for substitution for
2765 * comparison operations and
fc36a67e 2766 * concatenation */
a0d0e21e
LW		 2767 if (method==concat_amg || method==concat_ass_amg
2768 || method==repeat_amg || method==repeat_ass_amg) {
2769 return NULL; /* Delegate operation to string conversion */
2770 }
2771 off = -1;
2772 switch (method) {
2773 case lt_amg:
2774 case le_amg:
2775 case gt_amg:
2776 case ge_amg:
2777 case eq_amg:
2778 case ne_amg:
2ab54efd
MB		 2779 off = ncmp_amg;
2780 break;
a0d0e21e
LW		 2781 case slt_amg:
2782 case sle_amg:
2783 case sgt_amg:
2784 case sge_amg:
2785 case seq_amg:
2786 case sne_amg:
2ab54efd
MB		 2787 off = scmp_amg;
2788 break;
a0d0e21e 2789 }
bf5522a1
MB		 2790 if (off != -1) {
2791 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2792 cv = ocvp[off];
2793 lr = -1;
2794 }
2795 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2796 cv = cvp[off];
2797 lr = 1;
2798 }
2799 }
2800 if (cv)
2ab54efd
MB		 2801 postpr = 1;
2802 else
2803 goto not_found;
a0d0e21e 2804 } else {
a6006777 2805 not_found: /* No method found, either report or croak */
b267980d
NIS		 2806 switch (method) {
2807 case to_sv_amg:
2808 case to_av_amg:
2809 case to_hv_amg:
2810 case to_gv_amg:
2811 case to_cv_amg:
2812 /* FAIL safe */
2813 return left; /* Delegate operation to standard mechanisms. */
2814 break;
2815 }
a0d0e21e
LW		 2816 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2817 notfound = 1; lr = -1;
2818 } else if (cvp && (cv=cvp[nomethod_amg])) {
2819 notfound = 1; lr = 1;
bf5522a1
MB		 2820 } else if ((use_default_op =
2821 (!ocvp || oamtp->fallback >= AMGfallYES)
2822 && (!cvp || amtp->fallback >= AMGfallYES))
2823 && !DEBUG_o_TEST) {
4cc0ca18
NC		 2824 /* Skip generating the "no method found" message. */
2825 return NULL;
a0d0e21e 2826 } else {
46fc3d4c 2827 SV *msg;
774d564b 2828 if (off==-1) off=method;
b267980d 2829 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 2830 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
2831 AMG_id2name(method + assignshift),
2832 (flags & AMGf_unary ? " " : "\n\tleft "),
2833 SvAMAGIC(left)?
2834 "in overloaded package ":
2835 "has no overloaded magic",
2836 SvAMAGIC(left)?
2837 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
2838 SVfARG(&PL_sv_no),
2839 SvAMAGIC(right)?
2840 ",\n\tright argument in overloaded package ":
2841 (flags & AMGf_unary
2842 ? ""
2843 : ",\n\tright argument has no overloaded magic"),
2844 SvAMAGIC(right)?
2845 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
2846 SVfARG(&PL_sv_no)));
bf5522a1 2847 if (use_default_op) {
d66cca07 2848 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 2849 } else {
be2597df 2850 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 2851 }
2852 return NULL;
2853 }
ee239bfe 2854 force_cpy = force_cpy || assign;
a0d0e21e
LW		 2855 }
2856 }
67288365
JL		 2857
2858 switch (method) {
2859 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
2860 * operation. we need this to return a value, so that it can be assigned
2861 * later on, in the postpr block (case inc_amg/dec_amg), even if the
2862 * increment or decrement was itself called in void context */
2863 case inc_amg:
2864 if (off == add_amg)
2865 force_scalar = 1;
2866 break;
2867 case dec_amg:
2868 if (off == subtr_amg)
2869 force_scalar = 1;
2870 break;
2871 /* in these cases, we're calling an assignment variant of an operator
2872 * (+= rather than +, for instance). regardless of whether it's a
2873 * fallback or not, it always has to return a value, which will be
2874 * assigned to the proper variable later */
2875 case add_amg:
2876 case subtr_amg:
2877 case mult_amg:
2878 case div_amg:
2879 case modulo_amg:
2880 case pow_amg:
2881 case lshift_amg:
2882 case rshift_amg:
2883 case repeat_amg:
2884 case concat_amg:
2885 case band_amg:
2886 case bor_amg:
2887 case bxor_amg:
2888 if (assign)
2889 force_scalar = 1;
2890 break;
2891 /* the copy constructor always needs to return a value */
2892 case copy_amg:
2893 force_scalar = 1;
2894 break;
2895 /* because of the way these are implemented (they don't perform the
2896 * dereferencing themselves, they return a reference that perl then
2897 * dereferences later), they always have to be in scalar context */
2898 case to_sv_amg:
2899 case to_av_amg:
2900 case to_hv_amg:
2901 case to_gv_amg:
2902 case to_cv_amg:
2903 force_scalar = 1;
2904 break;
2905 /* these don't have an op of their own; they're triggered by their parent
2906 * op, so the context there isn't meaningful ('$a and foo()' in void
2907 * context still needs to pass scalar context on to $a's bool overload) */
2908 case bool__amg:
2909 case numer_amg:
2910 case string_amg:
2911 force_scalar = 1;
2912 break;
2913 }
2914
497b47a8 2915#ifdef DEBUGGING
a0d0e21e 2916 if (!notfound) {
497b47a8 2917 DEBUG_o(Perl_deb(aTHX_
d66cca07 2918 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 2919 AMG_id2name(off),
2920 method+assignshift==off? "" :
a0288114 2921 " (initially \"",
497b47a8
JH		 2922 method+assignshift==off? "" :
2923 AMG_id2name(method+assignshift),
a0288114 2924 method+assignshift==off? "" : "\")",
497b47a8
JH		 2925 flags & AMGf_unary? "" :
2926 lr==1 ? " for right argument": " for left argument",
2927 flags & AMGf_unary? " for argument" : "",
d66cca07 2928 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 2929 fl? ",\n\tassignment variant used": "") );
ee239bfe 2930 }
497b47a8 2931#endif
748a9306
LW		 2932 /* Since we use shallow copy during assignment, we need
2933 * to dublicate the contents, probably calling user-supplied
2934 * version of copy operator
2935 */
ee239bfe
IZ		 2936 /* We need to copy in following cases:
2937 * a) Assignment form was called.
2938 * assignshift==1, assign==T, method + 1 == off
2939 * b) Increment or decrement, called directly.
2940 * assignshift==0, assign==0, method + 0 == off
2941 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 2942 * assignshift==0, assign==T,
ee239bfe
IZ		 2943 * force_cpy == T
2944 * d) Increment or decrement, translated to nomethod.
b267980d 2945 * assignshift==0, assign==0,
ee239bfe
IZ		 2946 * force_cpy == T
2947 * e) Assignment form translated to nomethod.
2948 * assignshift==1, assign==T, method + 1 != off
2949 * force_cpy == T
2950 */
2951 /* off is method, method+assignshift, or a result of opcode substitution.
2952 * In the latter case assignshift==0, so only notfound case is important.
2953 */
73512201 2954 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 2955 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 2956 || force_cpy) )
6f1401dc 2957 {
1b38c28e
NC		 2958 /* newSVsv does not behave as advertised, so we copy missing
2959 * information by hand */
2960 SV *tmpRef = SvRV(left);
2961 SV *rv_copy;
31d632c3 2962 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 2963 SvRV_set(left, rv_copy);
2964 SvSETMAGIC(left);
e7881358 2965 SvREFCNT_dec_NN(tmpRef);
1b38c28e 2966 }
6f1401dc
DM		 2967 }
2968
a0d0e21e
LW		 2969 {
2970 dSP;
2971 BINOP myop;
2972 SV* res;
b7787f18 2973 const bool oldcatch = CATCH_GET;
67288365
JL		 2974 I32 oldmark, nret;
2975 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 2976
54310121 2977 CATCH_SET(TRUE);
a0d0e21e
LW		 2978 Zero(&myop, 1, BINOP);
2979 myop.op_last = (OP *) &myop;
b37c2d43 2980 myop.op_next = NULL;
67288365
JL		 2981 myop.op_flags = OPf_STACKED;
2982
2983 switch (gimme) {
2984 case G_VOID:
2985 myop.op_flags |= OPf_WANT_VOID;
2986 break;
2987 case G_ARRAY:
2988 if (flags & AMGf_want_list) {
2989 myop.op_flags |= OPf_WANT_LIST;
2990 break;
2991 }
2992 /* FALLTHROUGH */
2993 default:
2994 myop.op_flags |= OPf_WANT_SCALAR;
2995 break;
2996 }
a0d0e21e 2997
e788e7d3 2998 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 2999 ENTER;
462e5cf6 3000 SAVEOP();
533c011a 3001 PL_op = (OP *) &myop;
3280af22 3002 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3003 PL_op->op_private |= OPpENTERSUB_DB;
a0d0e21e 3004 PUTBACK;
897d3989 3005 Perl_pp_pushmark(aTHX);
a0d0e21e 3006
924508f0 3007 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3008 PUSHs(lr>0? right: left);
3009 PUSHs(lr>0? left: right);
3280af22 3010 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3011 if (notfound) {
59cd0e26
NC		 3012 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3013 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3014 }
ad64d0ec 3015 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3016 PUTBACK;
67288365 3017 oldmark = TOPMARK;
a0d0e21e 3018
139d0ce6 3019 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3020 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3021 LEAVE;
3022 SPAGAIN;
67288365
JL		 3023 nret = SP - (PL_stack_base + oldmark);
3024
3025 switch (gimme) {
3026 case G_VOID:
3027 /* returning NULL has another meaning, and we check the context
3028 * at the call site too, so this can be differentiated from the
3029 * scalar case */
3030 res = &PL_sv_undef;
3031 SP = PL_stack_base + oldmark;
3032 break;
3033 case G_ARRAY: {
3034 if (flags & AMGf_want_list) {
3035 res = sv_2mortal((SV *)newAV());
3036 av_extend((AV *)res, nret);
3037 while (nret--)
3038 av_store((AV *)res, nret, POPs);
3039 break;
3040 }
3041 /* FALLTHROUGH */
3042 }
3043 default:
3044 res = POPs;
3045 break;
3046 }
a0d0e21e 3047
ebafeae7 3048 PUTBACK;
d3acc0f7 3049 POPSTACK;
54310121 3050 CATCH_SET(oldcatch);
a0d0e21e 3051
a0d0e21e 3052 if (postpr) {
b7787f18 3053 int ans;
a0d0e21e
LW		 3054 switch (method) {
3055 case le_amg:
3056 case sle_amg:
3057 ans=SvIV(res)<=0; break;
3058 case lt_amg:
3059 case slt_amg:
3060 ans=SvIV(res)<0; break;
3061 case ge_amg:
3062 case sge_amg:
3063 ans=SvIV(res)>=0; break;
3064 case gt_amg:
3065 case sgt_amg:
3066 ans=SvIV(res)>0; break;
3067 case eq_amg:
3068 case seq_amg:
3069 ans=SvIV(res)==0; break;
3070 case ne_amg:
3071 case sne_amg:
3072 ans=SvIV(res)!=0; break;
3073 case inc_amg:
3074 case dec_amg:
bbce6d69 3075 SvSetSV(left,res); return left;
dc437b57 3076 case not_amg:
fe7ac86a 3077 ans=!SvTRUE(res); break;
b7787f18
AL		 3078 default:
3079 ans=0; break;
a0d0e21e 3080 }
54310121 3081 return boolSV(ans);
748a9306
LW		 3082 } else if (method==copy_amg) {
3083 if (!SvROK(res)) {
cea2e8a9 3084 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3085 }
3086 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3087 } else {
3088 return res;
3089 }
3090 }
3091}
c9d5ac95 3092
f5c1e807
NC		 3093void
3094Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3095{
3096 dVAR;
acda4c6a 3097 U32 hash;
f5c1e807 3098
7918f24d 3099 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3100
acda4c6a
NC		 3101 if (len > I32_MAX)
3102 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3103
ae8cc45f
NC		 3104 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3105 unshare_hek(GvNAME_HEK(gv));
3106 }
3107
acda4c6a 3108 PERL_HASH(hash, name, len);
c60dbbc3 3109 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3110}
3111
66610fdd 3112/*
f7461760
Z		 3113=for apidoc gv_try_downgrade
3114
2867cdbc
Z		 3115If the typeglob C<gv> can be expressed more succinctly, by having
3116something other than a real GV in its place in the stash, replace it
3117with the optimised form. Basic requirements for this are that C<gv>
3118is a real typeglob, is sufficiently ordinary, and is only referenced
3119from its package. This function is meant to be used when a GV has been
3120looked up in part to see what was there, causing upgrading, but based
3121on what was found it turns out that the real GV isn't required after all.
3122
3123If C<gv> is a completely empty typeglob, it is deleted from the stash.
3124
3125If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3126sub, the typeglob is replaced with a scalar-reference placeholder that
3127more compactly represents the same thing.
f7461760
Z		 3128
3129=cut
3130*/
3131
3132void
3133Perl_gv_try_downgrade(pTHX_ GV *gv)
3134{
3135 HV *stash;
3136 CV *cv;
3137 HEK *namehek;
3138 SV **gvp;
3139 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3140
3141 /* XXX Why and where does this leave dangling pointers during global
3142 destruction? */
627364f1 3143 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3144
2867cdbc 3145 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3146 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3147 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3148 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3149 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3150 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3151 return;
803f2748
DM		 3152 if (SvMAGICAL(gv)) {
3153 MAGIC *mg;
3154 /* only backref magic is allowed */
3155 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3156 return;
3157 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3158 if (mg->mg_type != PERL_MAGIC_backref)
3159 return;
3160 }
3161 }
2867cdbc
Z		 3162 cv = GvCV(gv);
3163 if (!cv) {
3164 HEK *gvnhek = GvNAME_HEK(gv);
3165 (void)hv_delete(stash, HEK_KEY(gvnhek),
3166 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
3167 } else if (GvMULTI(gv) && cv &&
f7461760
Z		 3168 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3169 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3170 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3171 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3172 (namehek = GvNAME_HEK(gv)) &&
3173 (gvp = hv_fetch(stash, HEK_KEY(namehek),
3174 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
3175 *gvp == (SV*)gv) {
3176 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
3177 SvREFCNT(gv) = 0;
3178 sv_clear((SV*)gv);
3179 SvREFCNT(gv) = 1;
3180 SvFLAGS(gv) = SVt_IV|SVf_ROK;
3181 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3182 STRUCT_OFFSET(XPVIV, xiv_iv));
3183 SvRV_set(gv, value);
3184 }
3185}
3186
4aaa4757
FC		 3187#include "XSUB.h"
3188
3189static void
3190core_xsub(pTHX_ CV* cv)
3191{
3192 Perl_croak(aTHX_
3193 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3194 );
3195}
3196
f7461760 3197/*
66610fdd
RGS		 3198 * Local variables:
3199 * c-indentation-style: bsd
3200 * c-basic-offset: 4
14d04a33 3201 * indent-tabs-mode: nil
66610fdd
RGS		 3202 * End:
3203 *
14d04a33 3204 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3205 */
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