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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
NC		 164 U32 hash;
165#ifdef USE_ITHREADS
1df5f7c1
NC		 166 const char *const file
167 = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : "";
19bad673
NC		 168 const STRLEN len = strlen(file);
169#else
170 SV *const temp_sv = CopFILESV(PL_curcop);
171 const char *file;
172 STRLEN len;
173
7918f24d
NC		 174 PERL_ARGS_ASSERT_NEWGP;
175
19bad673
NC		 176 if (temp_sv) {
177 file = SvPVX(temp_sv);
178 len = SvCUR(temp_sv);
179 } else {
180 file = "";
181 len = 0;
182 }
183#endif
f4890806
NC		 184
185 PERL_HASH(hash, file, len);
186
12816592
NC		 187 Newxz(gp, 1, GP);
188
189#ifndef PERL_DONT_CREATE_GVSV
b5c2dcb8 190 gp->gp_sv = newSV(0);
12816592
NC		 191#endif
192
1df5f7c1 193 gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0;
12816592
NC		 194 /* XXX Ideally this cast would be replaced with a change to const char*
195 in the struct. */
f4890806 196 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC		 197 gp->gp_egv = gv;
198 gp->gp_refcnt = 1;
199
200 return gp;
201}
202
803f2748
DM		 203/* Assign CvGV(cv) = gv, handling weak references.
204 * See also S_anonymise_cv_maybe */
205
206void
207Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
208{
209 GV * const oldgv = CvGV(cv);
210 PERL_ARGS_ASSERT_CVGV_SET;
211
212 if (oldgv == gv)
213 return;
214
215 if (oldgv) {
cfc1e951 216 if (CvCVGV_RC(cv)) {
803f2748 217 SvREFCNT_dec(oldgv);
cfc1e951
DM		 218 CvCVGV_RC_off(cv);
219 }
803f2748 220 else {
803f2748
DM		 221 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
222 }
223 }
224
b3f91e91 225 SvANY(cv)->xcv_gv = gv;
c794ca97 226 assert(!CvCVGV_RC(cv));
803f2748
DM		 227
228 if (!gv)
229 return;
230
c794ca97
DM		 231 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
232 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
233 else {
cfc1e951 234 CvCVGV_RC_on(cv);
803f2748
DM		 235 SvREFCNT_inc_simple_void_NN(gv);
236 }
803f2748
DM		 237}
238
c68d9564
Z		 239/* Assign CvSTASH(cv) = st, handling weak references. */
240
241void
242Perl_cvstash_set(pTHX_ CV *cv, HV *st)
243{
244 HV *oldst = CvSTASH(cv);
245 PERL_ARGS_ASSERT_CVSTASH_SET;
246 if (oldst == st)
247 return;
248 if (oldst)
249 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
250 SvANY(cv)->xcv_stash = st;
251 if (st)
252 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
253}
803f2748 254
e1104062
FC		 255/*
256=for apidoc gv_init_pvn
257
258Converts a scalar into a typeglob. This is an incoercible typeglob;
259assigning a reference to it will assign to one of its slots, instead of
260overwriting it as happens with typeglobs created by SvSetSV. Converting
261any scalar that is SvOK() may produce unpredictable results and is reserved
262for perl's internal use.
263
264C<gv> is the scalar to be converted.
265
266C<stash> is the parent stash/package, if any.
267
04ec7e59
FC		 268C<name> and C<len> give the name. The name must be unqualified;
269that is, it must not include the package name. If C<gv> is a
e1104062
FC		 270stash element, it is the caller's responsibility to ensure that the name
271passed to this function matches the name of the element. If it does not
272match, perl's internal bookkeeping will get out of sync.
273
04ec7e59
FC		 274C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
275the return value of SvUTF8(sv). It can also take the
276GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC		 277seen before (i.e., suppress "Used once" warnings).
278
279=for apidoc gv_init
280
281The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC		 282has no flags parameter. If the C<multi> parameter is set, the
283GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC		 284
285=for apidoc gv_init_pv
286
287Same as gv_init_pvn(), but takes a nul-terminated string for the name
288instead of separate char * and length parameters.
289
290=for apidoc gv_init_sv
291
292Same as gv_init_pvn(), but takes an SV * for the name instead of separate
293char * and length parameters. C<flags> is currently unused.
294
295=cut
296*/
297
463ee0b2 298void
04ec7e59 299Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF		 300{
301 char *namepv;
302 STRLEN namelen;
303 PERL_ARGS_ASSERT_GV_INIT_SV;
304 namepv = SvPV(namesv, namelen);
305 if (SvUTF8(namesv))
306 flags |= SVf_UTF8;
04ec7e59 307 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF		 308}
309
310void
04ec7e59 311Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF		 312{
313 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 314 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF		 315}
316
317void
04ec7e59 318Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 319{
27da23d5 320 dVAR;
3b6733bf
NC		 321 const U32 old_type = SvTYPE(gv);
322 const bool doproto = old_type > SVt_NULL;
f9509170 323 char * const proto = (doproto && SvPOK(gv))
dad95a0a 324 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 325 : NULL;
49a54bbe 326 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 327 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 328 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 329 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 330
e6066781 331 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC		 332 assert (!(proto && has_constant));
333
334 if (has_constant) {
5c1f4d79
NC		 335 /* The constant has to be a simple scalar type. */
336 switch (SvTYPE(has_constant)) {
337 case SVt_PVAV:
338 case SVt_PVHV:
339 case SVt_PVCV:
340 case SVt_PVFM:
341 case SVt_PVIO:
342 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
343 sv_reftype(has_constant, 0));
42d0e0b7 344 default: NOOP;
5c1f4d79 345 }
756cb477
NC		 346 SvRV_set(gv, NULL);
347 SvROK_off(gv);
348 }
463ee0b2 349
3b6733bf
NC		 350
351 if (old_type < SVt_PVGV) {
352 if (old_type >= SVt_PV)
353 SvCUR_set(gv, 0);
ad64d0ec 354 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 355 }
55d729e4
GS		 356 if (SvLEN(gv)) {
357 if (proto) {
f880fe2f 358 SvPV_set(gv, NULL);
b162af07 359 SvLEN_set(gv, 0);
55d729e4
GS		 360 SvPOK_off(gv);
361 } else
94010e71 362 Safefree(SvPVX_mutable(gv));
55d729e4 363 }
2e5b91de
NC		 364 SvIOK_off(gv);
365 isGV_with_GP_on(gv);
12816592 366
c43ae56f 367 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 368 GvSTASH(gv) = stash;
369 if (stash)
ad64d0ec 370 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 371 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 372 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
373 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 374 if (doproto) {
e3d2b9e7 375 CV *cv;
756cb477
NC		 376 if (has_constant) {
377 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 378 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 379 /* In case op.c:S_process_special_blocks stole it: */
380 if (!GvCV(gv))
c43ae56f 381 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 382 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 383 /* If this reference was a copy of another, then the subroutine
384 must have been "imported", by a Perl space assignment to a GV
385 from a reference to CV. */
386 if (exported_constant)
387 GvIMPORTED_CV_on(gv);
186a5ba8 388 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 389 } else {
186a5ba8 390 cv = newSTUB(gv,1);
756cb477 391 }
55d729e4 392 if (proto) {
e3d2b9e7 393 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 394 SV_HAS_TRAILING_NUL);
e0260a5b 395 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 396 }
397 }
463ee0b2
LW		 398}
399
76e3520e 400STATIC void
e6066781 401S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 402{
e6066781 403 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 404
a0d0e21e
LW		 405 switch (sv_type) {
406 case SVt_PVIO:
407 (void)GvIOn(gv);
408 break;
409 case SVt_PVAV:
410 (void)GvAVn(gv);
411 break;
412 case SVt_PVHV:
413 (void)GvHVn(gv);
414 break;
c69033f2
NC		 415#ifdef PERL_DONT_CREATE_GVSV
416 case SVt_NULL:
417 case SVt_PVCV:
418 case SVt_PVFM:
e654831b 419 case SVt_PVGV:
c69033f2
NC		 420 break;
421 default:
dbdce04c
NC		 422 if(GvSVn(gv)) {
423 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
424 If we just cast GvSVn(gv) to void, it ignores evaluating it for
425 its side effect */
426 }
c69033f2 427#endif
a0d0e21e
LW		 428 }
429}
430
0f8d4b5e
FC		 431static void core_xsub(pTHX_ CV* cv);
432
433static GV *
434S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 435 const char * const name, const STRLEN len)
0f8d4b5e
FC		 436{
437 const int code = keyword(name, len, 1);
438 static const char file[] = __FILE__;
97021f77 439 CV *cv, *oldcompcv = NULL;
0f8d4b5e
FC		 440 int opnum = 0;
441 SV *opnumsv;
442 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 443 COP *oldcurcop = NULL;
444 yy_parser *oldparser = NULL;
445 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 446
447 assert(gv || stash);
448 assert(name);
0f8d4b5e 449
88b892d8
FC		 450 if (!code) return NULL; /* Not a keyword */
451 switch (code < 0 ? -code : code) {
0f8d4b5e 452 /* no support for \&CORE::infix;
d885f758 453 no support for funcs that do not parse like funcs */
88b892d8
FC		 454 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
455 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp: case KEY_CORE :
eb31eb35 456 case KEY_default : case KEY_DESTROY:
88b892d8 457 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 458 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 459 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 460 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 461 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
462 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
463 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 464 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 465 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 466 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 467 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 468 case KEY_state: case KEY_sub :
46bef06f 469 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 470 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
471 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 472 return NULL;
473 case KEY_chdir:
eb31eb35 474 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 475 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 476 case KEY_keys:
477 case KEY_lstat:
478 case KEY_pop:
479 case KEY_push:
480 case KEY_shift:
a99f2ca2 481 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 482 case KEY_stat:
483 case KEY_system:
484 case KEY_truncate: case KEY_unlink:
485 case KEY_unshift:
486 case KEY_values:
487 ampable = FALSE;
488 }
489 if (!gv) {
490 gv = (GV *)newSV(0);
491 gv_init(gv, stash, name, len, TRUE);
492 }
7e68c38b 493 GvMULTI_on(gv);
0f8d4b5e
FC		 494 if (ampable) {
495 ENTER;
496 oldcurcop = PL_curcop;
497 oldparser = PL_parser;
498 lex_start(NULL, NULL, 0);
499 oldcompcv = PL_compcv;
500 PL_compcv = NULL; /* Prevent start_subparse from setting
501 CvOUTSIDE. */
502 oldsavestack_ix = start_subparse(FALSE,0);
503 cv = PL_compcv;
504 }
505 else {
506 /* Avoid calling newXS, as it calls us, and things start to
507 get hairy. */
508 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
509 GvCV_set(gv,cv);
510 GvCVGEN(gv) = 0;
511 mro_method_changed_in(GvSTASH(gv));
512 CvISXSUB_on(cv);
513 CvXSUB(cv) = core_xsub;
514 }
515 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
516 from PL_curcop. */
517 (void)gv_fetchfile(file);
518 CvFILE(cv) = (char *)file;
519 /* XXX This is inefficient, as doing things this order causes
520 a prototype check in newATTRSUB. But we have to do
521 it this order as we need an op number before calling
522 new ATTRSUB. */
523 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 524 if (stash)
73c02f15 525 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 526 if (ampable) {
0f8d4b5e 527 CvLVALUE_on(cv);
7e68c38b
FC		 528 newATTRSUB_flags(
529 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 530 NULL,NULL,
531 coresub_op(
532 opnum
533 ? newSVuv((UV)opnum)
534 : newSVpvn(name,len),
535 code, opnum
7e68c38b
FC		 536 ),
537 1
0f8d4b5e
FC		 538 );
539 assert(GvCV(gv) == cv);
c4ec50f1
FC		 540 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
541 && opnum != OP_UNDEF)
0f8d4b5e
FC		 542 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
543 LEAVE;
544 PL_parser = oldparser;
545 PL_curcop = oldcurcop;
546 PL_compcv = oldcompcv;
547 }
548 opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
549 cv_set_call_checker(
550 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
551 );
552 SvREFCNT_dec(opnumsv);
553 return gv;
554}
555
954c1994 556/*
6c53d59b
FC		 557=for apidoc gv_fetchmeth
558
559Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
560
e6919483
BF		 561=for apidoc gv_fetchmeth_sv
562
563Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
564of an SV instead of a string/length pair.
565
566=cut
567*/
568
569GV *
570Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
571{
572 char *namepv;
573 STRLEN namelen;
574 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
575 namepv = SvPV(namesv, namelen);
576 if (SvUTF8(namesv))
577 flags |= SVf_UTF8;
578 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
579}
580
581/*
582=for apidoc gv_fetchmeth_pv
583
584Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
585instead of a string/length pair.
586
587=cut
588*/
589
590GV *
591Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
592{
593 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
594 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
595}
596
597/*
598=for apidoc gv_fetchmeth_pvn
954c1994
GS		 599
600Returns the glob with the given C<name> and a defined subroutine or
601C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 602accessible via @ISA and UNIVERSAL::.
954c1994
GS		 603
604The argument C<level> should be either 0 or -1. If C<level==0>, as a
605side-effect creates a glob with the given C<name> in the given C<stash>
606which in the case of success contains an alias for the subroutine, and sets
e1a479c5 607up caching info for this glob.
954c1994 608
e6919483
BF		 609Currently, the only significant value for C<flags> is SVf_UTF8.
610
954c1994
GS		 611This function grants C<"SUPER"> token as a postfix of the stash name. The
612GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 613visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 614the GV directly; instead, you should use the method's CV, which can be
b267980d 615obtained from the GV with the C<GvCV> macro.
954c1994
GS		 616
617=cut
618*/
619
e1a479c5
BB		 620/* NOTE: No support for tied ISA */
621
79072805 622GV *
e6919483 623Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 624{
97aff369 625 dVAR;
463ee0b2 626 GV** gvp;
e1a479c5
BB		 627 AV* linear_av;
628 SV** linear_svp;
629 SV* linear_sv;
630 HV* cstash;
631 GV* candidate = NULL;
632 CV* cand_cv = NULL;
e1a479c5 633 GV* topgv = NULL;
bfcb3514 634 const char *hvname;
e1a479c5
BB		 635 I32 create = (level >= 0) ? 1 : 0;
636 I32 items;
637 STRLEN packlen;
638 U32 topgen_cmp;
04f3bf56 639 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 640
e6919483 641 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 642
af09ea45
IK		 643 /* UNIVERSAL methods should be callable without a stash */
644 if (!stash) {
e1a479c5 645 create = 0; /* probably appropriate */
da51bb9b 646 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 647 return 0;
648 }
649
e1a479c5
BB		 650 assert(stash);
651
bfcb3514
NC		 652 hvname = HvNAME_get(stash);
653 if (!hvname)
e1a479c5 654 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 655
e1a479c5
BB		 656 assert(hvname);
657 assert(name);
463ee0b2 658
bfcb3514 659 DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) );
44a8e56a 660
dd69841b 661 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5
BB		 662
663 /* check locally for a real method or a cache entry */
c60dbbc3 664 gvp = (GV**)hv_fetch(stash, name, is_utf8 ? -(I32)len : (I32)len, create);
e1a479c5
BB		 665 if(gvp) {
666 topgv = *gvp;
0f8d4b5e 667 have_gv:
e1a479c5
BB		 668 assert(topgv);
669 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 670 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 671 if ((cand_cv = GvCV(topgv))) {
672 /* If genuine method or valid cache entry, use it */
673 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
674 return topgv;
675 }
676 else {
677 /* stale cache entry, junk it and move on */
678 SvREFCNT_dec(cand_cv);
c43ae56f
DM		 679 GvCV_set(topgv, NULL);
680 cand_cv = NULL;
e1a479c5
BB		 681 GvCVGEN(topgv) = 0;
682 }
683 }
684 else if (GvCVGEN(topgv) == topgen_cmp) {
685 /* cache indicates no such method definitively */
686 return 0;
687 }
0f8d4b5e
FC		 688 else if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
689 && strnEQ(hvname, "CORE", 4)
87566176 690 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 691 goto have_gv;
463ee0b2 692 }
79072805 693
e1a479c5
BB		 694 packlen = HvNAMELEN_get(stash);
695 if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) {
696 HV* basestash;
697 packlen -= 7;
772d5078
BF		 698 basestash = gv_stashpvn(hvname, packlen,
699 GV_ADD | (HvNAMEUTF8(stash) ? SVf_UTF8 : 0));
e1a479c5 700 linear_av = mro_get_linear_isa(basestash);
9607fc9c 701 }
e1a479c5
BB		 702 else {
703 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
79072805 704 }
a0d0e21e 705
e1a479c5
BB		 706 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
707 items = AvFILLp(linear_av); /* no +1, to skip over self */
708 while (items--) {
709 linear_sv = *linear_svp++;
710 assert(linear_sv);
711 cstash = gv_stashsv(linear_sv, 0);
712
dd69841b 713 if (!cstash) {
ecad31f0 714 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 715 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 716 SVfARG(linear_sv),
d0c0e7dd 717 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 718 continue;
719 }
9607fc9c 720
e1a479c5
BB		 721 assert(cstash);
722
c60dbbc3 723 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 724 if (!gvp) {
725 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
726 const char *hvname = HvNAME(cstash); assert(hvname);
727 if (strnEQ(hvname, "CORE", 4)
728 && (candidate =
87566176 729 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 730 ))
731 goto have_candidate;
732 }
733 continue;
734 }
735 else candidate = *gvp;
736 have_candidate:
e1a479c5 737 assert(candidate);
04f3bf56 738 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 739 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 740 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
741 /*
742 * Found real method, cache method in topgv if:
743 * 1. topgv has no synonyms (else inheritance crosses wires)
744 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
745 */
746 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 747 CV *old_cv = GvCV(topgv);
748 SvREFCNT_dec(old_cv);
e1a479c5 749 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 750 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 751 GvCVGEN(topgv) = topgen_cmp;
752 }
753 return candidate;
754 }
755 }
9607fc9c 756
e1a479c5
BB		 757 /* Check UNIVERSAL without caching */
758 if(level == 0 || level == -1) {
e6919483 759 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags);
e1a479c5
BB		 760 if(candidate) {
761 cand_cv = GvCV(candidate);
762 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 763 CV *old_cv = GvCV(topgv);
764 SvREFCNT_dec(old_cv);
e1a479c5 765 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 766 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 767 GvCVGEN(topgv) = topgen_cmp;
768 }
769 return candidate;
770 }
771 }
772
773 if (topgv && GvREFCNT(topgv) == 1) {
774 /* cache the fact that the method is not defined */
775 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 776 }
777
79072805
LW		 778 return 0;
779}
780
954c1994 781/*
460e5730
FC		 782=for apidoc gv_fetchmeth_autoload
783
784This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
785parameter.
786
d21989ed 787=for apidoc gv_fetchmeth_sv_autoload
611c1e95 788
d21989ed
BF		 789Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
790of an SV instead of a string/length pair.
791
792=cut
793*/
794
795GV *
796Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
797{
798 char *namepv;
799 STRLEN namelen;
800 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
801 namepv = SvPV(namesv, namelen);
802 if (SvUTF8(namesv))
803 flags |= SVf_UTF8;
804 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
805}
806
807/*
808=for apidoc gv_fetchmeth_pv_autoload
809
810Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
811instead of a string/length pair.
812
813=cut
814*/
815
816GV *
817Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
818{
819 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
820 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
821}
822
823/*
824=for apidoc gv_fetchmeth_pvn_autoload
825
826Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ		 827Returns a glob for the subroutine.
828
829For an autoloaded subroutine without a GV, will create a GV even
830if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
831of the result may be zero.
832
d21989ed
BF		 833Currently, the only significant value for C<flags> is SVf_UTF8.
834
611c1e95
IZ		 835=cut
836*/
837
838GV *
d21989ed 839Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 840{
499321d3 841 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 842
d21989ed 843 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 844
611c1e95 845 if (!gv) {
611c1e95
IZ		 846 CV *cv;
847 GV **gvp;
848
849 if (!stash)
6136c704 850 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 851 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 852 return NULL;
d21989ed 853 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 854 return NULL;
611c1e95
IZ		 855 cv = GvCV(gv);
856 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 857 return NULL;
611c1e95
IZ		 858 /* Have an autoload */
859 if (level < 0) /* Cannot do without a stub */
d21989ed 860 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 861 gvp = (GV**)hv_fetch(stash, name,
862 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 863 if (!gvp)
6136c704 864 return NULL;
611c1e95
IZ		 865 return *gvp;
866 }
867 return gv;
868}
869
870/*
954c1994
GS		 871=for apidoc gv_fetchmethod_autoload
872
873Returns the glob which contains the subroutine to call to invoke the method
874on the C<stash>. In fact in the presence of autoloading this may be the
875glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 876already setup.
954c1994
GS		 877
878The third parameter of C<gv_fetchmethod_autoload> determines whether
879AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 880means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 881Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 882with a non-zero C<autoload> parameter.
954c1994
GS		 883
884These functions grant C<"SUPER"> token as a prefix of the method name. Note
885that if you want to keep the returned glob for a long time, you need to
886check for it being "AUTOLOAD", since at the later time the call may load a
887different subroutine due to $AUTOLOAD changing its value. Use the glob
b267980d 888created via a side effect to do this.
954c1994
GS		 889
890These functions have the same side-effects and as C<gv_fetchmeth> with
891C<level==0>. C<name> should be writable if contains C<':'> or C<'
892''>. The warning against passing the GV returned by C<gv_fetchmeth> to
b267980d 893C<call_sv> apply equally to these functions.
954c1994
GS		 894
895=cut
896*/
897
7d3b1f61 898STATIC HV*
9cc50d5b 899S_gv_get_super_pkg(pTHX_ const char* name, I32 namelen, U32 flags)
7d3b1f61
BB		 900{
901 AV* superisa;
902 GV** gvp;
903 GV* gv;
904 HV* stash;
905
7918f24d
NC		 906 PERL_ARGS_ASSERT_GV_GET_SUPER_PKG;
907
f8e7a8bc 908 stash = gv_stashpvn(name, namelen, flags);
7d3b1f61
BB		 909 if(stash) return stash;
910
911 /* If we must create it, give it an @ISA array containing
912 the real package this SUPER is for, so that it's tied
913 into the cache invalidation code correctly */
f8e7a8bc 914 stash = gv_stashpvn(name, namelen, GV_ADD | flags);
7d3b1f61
BB		 915 gvp = (GV**)hv_fetchs(stash, "ISA", TRUE);
916 gv = *gvp;
f8e7a8bc 917 gv_init(gv, stash, "ISA", 3, TRUE);
7d3b1f61
BB		 918 superisa = GvAVn(gv);
919 GvMULTI_on(gv);
ad64d0ec 920 sv_magic(MUTABLE_SV(superisa), MUTABLE_SV(gv), PERL_MAGIC_isa, NULL, 0);
8e3a4a30
NC		 921 av_push(superisa, newSVhek(CopSTASH(PL_curcop)
922 ? HvNAME_HEK(CopSTASH(PL_curcop)) : NULL));
7d3b1f61
BB		 923
924 return stash;
925}
926
dc848c6f 927GV *
864dbfa3 928Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 929{
547bb267
NC		 930 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
931
256d1bb2
NC		 932 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
933}
934
44130a26
BF		 935GV *
936Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
937{
938 char *namepv;
939 STRLEN namelen;
940 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
941 namepv = SvPV(namesv, namelen);
942 if (SvUTF8(namesv))
943 flags |= SVf_UTF8;
944 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
945}
946
947GV *
948Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
949{
950 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
951 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
952}
953
256d1bb2
NC		 954/* Don't merge this yet, as it's likely to get a len parameter, and possibly
955 even a U32 hash */
956GV *
44130a26 957Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 958{
97aff369 959 dVAR;
eb578fdb 960 const char *nend;
c445ea15 961 const char *nsplit = NULL;
a0d0e21e 962 GV* gv;
0dae17bd 963 HV* ostash = stash;
c94593d0 964 const char * const origname = name;
ad64d0ec 965 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 966 const U32 autoload = flags & GV_AUTOLOAD;
967 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 968 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 969
44130a26 970 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 971
eff494dd 972 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 973 stash = NULL;
c9bf4021
NC		 974 else {
975 /* The only way stash can become NULL later on is if nsplit is set,
976 which in turn means that there is no need for a SVt_PVHV case
977 the error reporting code. */
978 }
b267980d 979
44130a26 980 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 981 if (*nend == '\'') {
a0d0e21e 982 nsplit = nend;
c94593d0
NC		 983 name = nend + 1;
984 }
985 else if (*nend == ':' && *(nend + 1) == ':') {
986 nsplit = nend++;
987 name = nend + 1;
988 }
a0d0e21e
LW		 989 }
990 if (nsplit) {
7edbdc6b 991 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 992 /* ->SUPER::method should really be looked up in original stash */
d0c0e7dd
FC		 993 SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_
994 "%"HEKf"::SUPER",
995 HEKfARG(HvNAME_HEK((HV*)CopSTASH(PL_curcop)))
996 ));
af09ea45 997 /* __PACKAGE__::SUPER stash should be autovivified */
9cc50d5b 998 stash = gv_get_super_pkg(SvPVX_const(tmpstr), SvCUR(tmpstr), SvUTF8(tmpstr));
cea2e8a9 999 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
bfcb3514 1000 origname, HvNAME_get(stash), name) );
4633a7c4 1001 }
e189a56d 1002 else {
af09ea45 1003 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1004 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d
IK		 1005
1006 /* however, explicit calls to Pkg::SUPER::method may
1007 happen, and may require autovivification to work */
1008 if (!stash && (nsplit - origname) >= 7 &&
1009 strnEQ(nsplit - 7, "::SUPER", 7) &&
14d1dfbd 1010 gv_stashpvn(origname, nsplit - origname - 7, is_utf8))
9cc50d5b 1011 stash = gv_get_super_pkg(origname, nsplit - origname, flags);
e189a56d 1012 }
0dae17bd 1013 ostash = stash;
4633a7c4
LW		 1014 }
1015
14d1dfbd 1016 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1017 if (!gv) {
2f6e0fe7 1018 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1019 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1020 else if (autoload)
c8416c26
BF		 1021 gv = gv_autoload_pvn(
1022 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1023 );
256d1bb2
NC		 1024 if (!gv && do_croak) {
1025 /* Right now this is exclusively for the benefit of S_method_common
1026 in pp_hot.c */
1027 if (stash) {
15e6cdd9
DG		 1028 /* If we can't find an IO::File method, it might be a call on
1029 * a filehandle. If IO:File has not been loaded, try to
1030 * require it first instead of croaking */
1031 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1032 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1033 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1034 STR_WITH_LEN("IO/File.pm"), 0,
1035 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1036 ) {
31b05a0f 1037 require_pv("IO/File.pm");
14d1dfbd 1038 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1039 if (gv)
1040 return gv;
1041 }
256d1bb2 1042 Perl_croak(aTHX_
d0c0e7dd
FC		 1043 "Can't locate object method \"%"SVf
1044 "\" via package \"%"HEKf"\"",
f937af42
BF		 1045 SVfARG(newSVpvn_flags(name, nend - name,
1046 SVs_TEMP | is_utf8)),
d0c0e7dd 1047 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1048 }
1049 else {
ecad31f0 1050 SV* packnamesv;
256d1bb2 1051
256d1bb2 1052 if (nsplit) {
ecad31f0
BF		 1053 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1054 SVs_TEMP | is_utf8);
256d1bb2 1055 } else {
ecad31f0 1056 packnamesv = sv_2mortal(newSVsv(error_report));
256d1bb2
NC		 1057 }
1058
1059 Perl_croak(aTHX_
ecad31f0
BF		 1060 "Can't locate object method \"%"SVf"\" via package \"%"SVf"\""
1061 " (perhaps you forgot to load \"%"SVf"\"?)",
1062 SVfARG(newSVpvn_flags(name, nend - name,
1063 SVs_TEMP | is_utf8)),
1064 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1065 }
1066 }
463ee0b2 1067 }
dc848c6f 1068 else if (autoload) {
9d4ba2ae 1069 CV* const cv = GvCV(gv);
09280a33
CS		 1070 if (!CvROOT(cv) && !CvXSUB(cv)) {
1071 GV* stubgv;
1072 GV* autogv;
1073
1074 if (CvANON(cv))
1075 stubgv = gv;
1076 else {
1077 stubgv = CvGV(cv);
1078 if (GvCV(stubgv) != cv) /* orphaned import */
1079 stubgv = gv;
1080 }
c8416c26
BF		 1081 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1082 GvNAME(stubgv), GvNAMELEN(stubgv),
1083 GV_AUTOLOAD_ISMETHOD
1084 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1085 if (autogv)
1086 gv = autogv;
1087 }
1088 }
44a8e56a 1089
1090 return gv;
1091}
1092
1093GV*
0eeb01b9 1094Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1095{
1096 char *namepv;
1097 STRLEN namelen;
0fe84f7c 1098 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1099 namepv = SvPV(namesv, namelen);
1100 if (SvUTF8(namesv))
1101 flags |= SVf_UTF8;
0eeb01b9 1102 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1103}
1104
1105GV*
0eeb01b9 1106Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1107{
0fe84f7c 1108 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1109 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1110}
1111
1112GV*
0eeb01b9 1113Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1114{
27da23d5 1115 dVAR;
44a8e56a 1116 GV* gv;
1117 CV* cv;
1118 HV* varstash;
1119 GV* vargv;
1120 SV* varsv;
c8416c26
BF		 1121 SV *packname = NULL;
1122 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1123
0fe84f7c 1124 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1125
7edbdc6b 1126 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1127 return NULL;
0dae17bd
GS		 1128 if (stash) {
1129 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1130 STRLEN packname_len = 0;
1131 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1132 packname = newSVpvn_flags(packname_ptr, packname_len,
1133 SVs_TEMP | SvUTF8(stash));
5c284bb0 1134 stash = NULL;
0dae17bd 1135 }
c8416c26
BF		 1136 else
1137 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
0dae17bd 1138 }
c8416c26 1139 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
a0714e2c 1140 return NULL;
dc848c6f 1141 cv = GvCV(gv);
1142
adb5a9ae 1143 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1144 return NULL;
ed850460 1145
dc848c6f 1146 /*
1147 * Inheriting AUTOLOAD for non-methods works ... for now.
1148 */
0eeb01b9
FC		 1149 if (
1150 !(flags & GV_AUTOLOAD_ISMETHOD)
1151 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1152 )
d1d15184 1153 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
ecad31f0
BF		 1154 "Use of inherited AUTOLOAD for non-method %"SVf"::%"SVf"() is deprecated",
1155 SVfARG(packname),
1156 SVfARG(newSVpvn_flags(name, len, SVs_TEMP | is_utf8)));
44a8e56a 1157
aed2304a 1158 if (CvISXSUB(cv)) {
bb619f37
FC		 1159 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1160 * and split that value on the last '::', pass along the same data
1161 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1162 *
1163 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1164 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1165 * type. Since SvPVX has been documented as returning the sub name
1166 * for a long time, but not as returning the prototype, we have
1167 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1168 * elsewhere.
1169 *
1170 * We put the prototype in the same allocated buffer, but after
1171 * the sub name. The SvPOK flag indicates the presence of a proto-
1172 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1173 * If both flags are on, then SvLEN is used to indicate the end of
1174 * the prototype (artificially lower than what is actually allo-
1175 * cated), at the risk of having to reallocate a few bytes unneces-
1176 * sarily--but that should happen very rarely, if ever.
1177 *
1178 * We use SvUTF8 for both prototypes and sub names, so if one is
1179 * UTF8, the other must be upgraded.
adb5a9ae 1180 */
c68d9564 1181 CvSTASH_set(cv, stash);
8fa6a409
FC		 1182 if (SvPOK(cv)) { /* Ouch! */
1183 SV *tmpsv = newSVpvn_flags(name, len, is_utf8);
1184 STRLEN ulen;
1185 const char *proto = CvPROTO(cv);
1186 assert(proto);
1187 if (SvUTF8(cv))
1188 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1189 ulen = SvCUR(tmpsv);
1190 SvCUR(tmpsv)++; /* include null in string */
1191 sv_catpvn_flags(
1192 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1193 );
1194 SvTEMP_on(tmpsv); /* Allow theft */
1195 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1196 SvTEMP_off(tmpsv);
8fa6a409
FC		 1197 SvREFCNT_dec(tmpsv);
1198 SvLEN(cv) = SvCUR(cv) + 1;
1199 SvCUR(cv) = ulen;
1200 }
1201 else {
1202 sv_setpvn((SV *)cv, name, len);
1203 SvPOK_off(cv);
1204 if (is_utf8)
c8416c26 1205 SvUTF8_on(cv);
8fa6a409
FC		 1206 else SvUTF8_off(cv);
1207 }
1208 CvAUTOLOAD_on(cv);
adb5a9ae 1209 }
adb5a9ae 1210
44a8e56a 1211 /*
1212 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1213 * The subroutine's original name may not be "AUTOLOAD", so we don't
1214 * use that, but for lack of anything better we will use the sub's
1215 * original package to look up $AUTOLOAD.
1216 */
1217 varstash = GvSTASH(CvGV(cv));
5c7983e5 1218 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1219 ENTER;
1220
c69033f2 1221 if (!isGV(vargv)) {
04ec7e59 1222 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1223#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1224 GvSV(vargv) = newSV(0);
c69033f2
NC		 1225#endif
1226 }
3d35f11b 1227 LEAVE;
e203899d 1228 varsv = GvSVn(vargv);
4bac9ae4
CS		 1229 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1230 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1231 sv_setsv(varsv, packname);
396482e1 1232 sv_catpvs(varsv, "::");
d40bf27b
NC		 1233 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1234 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1235 sv_catpvn_flags(
1236 varsv, name, len,
5bcd1ef4 1237 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1238 );
c8416c26
BF		 1239 if (is_utf8)
1240 SvUTF8_on(varsv);
a0d0e21e
LW		 1241 return gv;
1242}
1243
44a2ac75
YO		 1244
1245/* require_tie_mod() internal routine for requiring a module
486ec47a 1246 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1247 *
1248 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1249 * "varpv" holds the name of the var, used for error messages.
1250 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1251 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1252 * are working reasonably close to as expected.
1253 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1254 * For the protection of $! to work (it is set by this routine)
1255 * the sv slot must already be magicalized.
d2c93421 1256 */
44a2ac75
YO		 1257STATIC HV*
1258S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1259{
27da23d5 1260 dVAR;
da51bb9b 1261 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1262
7918f24d
NC		 1263 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1264
0ea03996 1265 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1266 SV *module = newSVsv(namesv);
1267 char varname = *varpv; /* varpv might be clobbered by load_module,
1268 so save it. For the moment it's always
1269 a single char. */
b82b06b8 1270 const char type = varname == '[' ? '$' : '%';
d2c93421 1271 dSP;
d2c93421 1272 ENTER;
44a2ac75 1273 if ( flags & 1 )
45cbc99a 1274 save_scalar(gv);
cac54379 1275 PUSHSTACKi(PERLSI_MAGIC);
45cbc99a 1276 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
cac54379 1277 POPSTACK;
d2c93421
RH		 1278 LEAVE;
1279 SPAGAIN;
da51bb9b 1280 stash = gv_stashsv(namesv, 0);
44a2ac75 1281 if (!stash)
b82b06b8
FC		 1282 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1283 type, varname, SVfARG(namesv));
45cbc99a 1284 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1285 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1286 type, varname, SVfARG(namesv), methpv);
d2c93421 1287 }
45cbc99a 1288 SvREFCNT_dec(namesv);
44a2ac75 1289 return stash;
d2c93421
RH		 1290}
1291
954c1994
GS		 1292/*
1293=for apidoc gv_stashpv
1294
da51bb9b 1295Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1296determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1297
1298=cut
1299*/
1300
a0d0e21e 1301HV*
864dbfa3 1302Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1303{
7918f24d 1304 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1305 return gv_stashpvn(name, strlen(name), create);
1306}
1307
bc96cb06
SH		 1308/*
1309=for apidoc gv_stashpvn
1310
da51bb9b
NC		 1311Returns a pointer to the stash for a specified package. The C<namelen>
1312parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1313to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1314created if it does not already exist. If the package does not exist and
1315C<flags> is 0 (or any other setting that does not create packages) then NULL
1316is returned.
1317
566a4718
YO		 1318Flags may be one of:
1319
1320 GV_ADD
1321 SVf_UTF8
1322 GV_NOADD_NOINIT
1323 GV_NOINIT
1324 GV_NOEXPAND
1325 GV_ADDMG
1326
1327The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH		 1328
1329=cut
1330*/
1331
dc437b57 1332HV*
da51bb9b 1333Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1334{
0cea0058 1335 char smallbuf[128];
46fc3d4c 1336 char *tmpbuf;
a0d0e21e
LW		 1337 HV *stash;
1338 GV *tmpgv;
add0ecde 1339 U32 tmplen = namelen + 2;
dc437b57 1340
7918f24d
NC		 1341 PERL_ARGS_ASSERT_GV_STASHPVN;
1342
add0ecde 1343 if (tmplen <= sizeof smallbuf)
46fc3d4c 1344 tmpbuf = smallbuf;
1345 else
add0ecde
VP		 1346 Newx(tmpbuf, tmplen, char);
1347 Copy(name, tmpbuf, namelen, char);
1348 tmpbuf[namelen] = ':';
1349 tmpbuf[namelen+1] = ':';
1350 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1351 if (tmpbuf != smallbuf)
1352 Safefree(tmpbuf);
a0d0e21e 1353 if (!tmpgv)
da51bb9b 1354 return NULL;
a0d0e21e 1355 stash = GvHV(tmpgv);
1f656fcf 1356 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1357 assert(stash);
1f656fcf 1358 if (!HvNAME_get(stash)) {
0be4d16f 1359 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1360
1361 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1362 /* If the containing stash has multiple effective
1363 names, see that this one gets them, too. */
1364 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1365 mro_package_moved(stash, NULL, tmpgv, 1);
1366 }
a0d0e21e 1367 return stash;
463ee0b2
LW		 1368}
1369
954c1994
GS		 1370/*
1371=for apidoc gv_stashsv
1372
da51bb9b 1373Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS		 1374
1375=cut
1376*/
1377
a0d0e21e 1378HV*
da51bb9b 1379Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1380{
dc437b57 1381 STRLEN len;
9d4ba2ae 1382 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC		 1383
1384 PERL_ARGS_ASSERT_GV_STASHSV;
1385
0be4d16f 1386 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW		 1387}
1388
1389
463ee0b2 1390GV *
fe9845cc 1391Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1392 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1393 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1394}
1395
1396GV *
fe9845cc 1397Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1398 STRLEN len;
77cb3b01
FC		 1399 const char * const nambeg =
1400 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1401 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1402 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1403}
1404
ad7cce9f 1405STATIC void
290a1700 1406S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1407{
1408 AV* av;
1409
1410 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1411
1412 av = GvAVn(gv);
1413 GvMULTI_on(gv);
1414 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1415 NULL, 0);
ad7cce9f
FR		 1416}
1417
7a5fd60d
NC		 1418GV *
1419Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
fe9845cc 1420 const svtype sv_type)
79072805 1421{
97aff369 1422 dVAR;
eb578fdb
KW		 1423 const char *name = nambeg;
1424 GV *gv = NULL;
79072805 1425 GV**gvp;
79072805 1426 I32 len;
eb578fdb 1427 const char *name_cursor;
c445ea15 1428 HV *stash = NULL;
add2581e 1429 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
e26df76a 1430 const I32 no_expand = flags & GV_NOEXPAND;
780a5241 1431 const I32 add = flags & ~GV_NOADD_MASK;
04f3bf56 1432 const U32 is_utf8 = flags & SVf_UTF8;
9da346da 1433 bool addmg = !!(flags & GV_ADDMG);
b3d904f3
NC		 1434 const char *const name_end = nambeg + full_len;
1435 const char *const name_em1 = name_end - 1;
5e0caaeb 1436 U32 faking_it;
79072805 1437
7918f24d
NC		 1438 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
1439
fafc274c
NC		 1440 if (flags & GV_NOTQUAL) {
1441 /* Caller promised that there is no stash, so we can skip the check. */
1442 len = full_len;
1443 goto no_stash;
1444 }
1445
ecad31f0 1446 if (full_len > 2 && *name == '*' && isIDFIRST_lazy_if(name + 1, is_utf8)) {
b208e10c 1447 /* accidental stringify on a GV? */
c07a80fd 1448 name++;
b208e10c 1449 }
c07a80fd 1450
b3d904f3 1451 for (name_cursor = name; name_cursor < name_end; name_cursor++) {
46c0ec20
FC		 1452 if (name_cursor < name_em1 &&
1453 ((*name_cursor == ':'
b3d904f3 1454 && name_cursor[1] == ':')
46c0ec20 1455 || *name_cursor == '\''))
463ee0b2 1456 {
463ee0b2 1457 if (!stash)
3280af22 1458 stash = PL_defstash;
dc437b57 1459 if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1460 return NULL;
463ee0b2 1461
b3d904f3 1462 len = name_cursor - name;
088225fd 1463 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
3a5b580c
NC		 1464 const char *key;
1465 if (*name_cursor == ':') {
1466 key = name;
e771aaa9
NC		 1467 len += 2;
1468 } else {
3a5b580c 1469 char *tmpbuf;
2ae0db35 1470 Newx(tmpbuf, len+2, char);
e771aaa9
NC		 1471 Copy(name, tmpbuf, len, char);
1472 tmpbuf[len++] = ':';
1473 tmpbuf[len++] = ':';
3a5b580c 1474 key = tmpbuf;
e771aaa9 1475 }
0be4d16f 1476 gvp = (GV**)hv_fetch(stash, key, is_utf8 ? -len : len, add);
a0714e2c 1477 gv = gvp ? *gvp : NULL;
159b6efe 1478 if (gv && gv != (const GV *)&PL_sv_undef) {
6fa846a0 1479 if (SvTYPE(gv) != SVt_PVGV)
04ec7e59 1480 gv_init_pvn(gv, stash, key, len, (add & GV_ADDMULTI)|is_utf8);
6fa846a0
GS		 1481 else
1482 GvMULTI_on(gv);
1483 }
3a5b580c 1484 if (key != name)
b9d2ea5b 1485 Safefree(key);
159b6efe 1486 if (!gv || gv == (const GV *)&PL_sv_undef)
a0714e2c 1487 return NULL;
85e6fe83 1488
463ee0b2 1489 if (!(stash = GvHV(gv)))
298d6511 1490 {
99ee9762
FC		 1491 stash = GvHV(gv) = newHV();
1492 if (!HvNAME_get(stash)) {
e058c50a
FC		 1493 if (GvSTASH(gv) == PL_defstash && len == 6
1494 && strnEQ(name, "CORE", 4))
1495 hv_name_set(stash, "CORE", 4, 0);
1496 else
1497 hv_name_set(
0be4d16f 1498 stash, nambeg, name_cursor-nambeg, is_utf8
e058c50a 1499 );
99ee9762
FC		 1500 /* If the containing stash has multiple effective
1501 names, see that this one gets them, too. */
1502 if (HvAUX(GvSTASH(gv))->xhv_name_count)
1503 mro_package_moved(stash, NULL, gv, 1);
1504 }
298d6511 1505 }
99ee9762 1506 else if (!HvNAME_get(stash))
0be4d16f 1507 hv_name_set(stash, nambeg, name_cursor - nambeg, is_utf8);
463ee0b2
LW		 1508 }
1509
b3d904f3
NC		 1510 if (*name_cursor == ':')
1511 name_cursor++;
088225fd 1512 name = name_cursor+1;
ad6bfa9d 1513 if (name == name_end)
159b6efe
NC		 1514 return gv
1515 ? gv : MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
79072805 1516 }
79072805 1517 }
b3d904f3 1518 len = name_cursor - name;
463ee0b2
LW		 1519
1520 /* No stash in name, so see how we can default */
1521
1522 if (!stash) {
fafc274c 1523 no_stash:
8ccce9ae 1524 if (len && isIDFIRST_lazy(name)) {
9607fc9c 1525 bool global = FALSE;
1526
8ccce9ae
NC		 1527 switch (len) {
1528 case 1:
18ea00d7 1529 if (*name == '_')
9d116dd7 1530 global = TRUE;
18ea00d7 1531 break;
8ccce9ae
NC		 1532 case 3:
1533 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1534 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1535 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
9d116dd7 1536 global = TRUE;
18ea00d7 1537 break;
8ccce9ae
NC		 1538 case 4:
1539 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1540 && name[3] == 'V')
9d116dd7 1541 global = TRUE;
18ea00d7 1542 break;
8ccce9ae
NC		 1543 case 5:
1544 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1545 && name[3] == 'I' && name[4] == 'N')
463ee0b2 1546 global = TRUE;
18ea00d7 1547 break;
8ccce9ae
NC		 1548 case 6:
1549 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1550 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1551 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
1552 global = TRUE;
1553 break;
1554 case 7:
1555 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1556 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1557 && name[6] == 'T')
18ea00d7
NC		 1558 global = TRUE;
1559 break;
463ee0b2 1560 }
9607fc9c 1561
463ee0b2 1562 if (global)
3280af22 1563 stash = PL_defstash;
923e4eb5 1564 else if (IN_PERL_COMPILETIME) {
3280af22
NIS		 1565 stash = PL_curstash;
1566 if (add && (PL_hints & HINT_STRICT_VARS) &&
748a9306
LW		 1567 sv_type != SVt_PVCV &&
1568 sv_type != SVt_PVGV &&
4633a7c4 1569 sv_type != SVt_PVFM &&
c07a80fd 1570 sv_type != SVt_PVIO &&
70ec6265
NC		 1571 !(len == 1 && sv_type == SVt_PV &&
1572 (*name == 'a' || *name == 'b')) )
748a9306 1573 {
0be4d16f 1574 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,0);
4633a7c4 1575 if (!gvp ||
159b6efe 1576 *gvp == (const GV *)&PL_sv_undef ||
a5f75d66
AD		 1577 SvTYPE(*gvp) != SVt_PVGV)
1578 {
d4c19fe8 1579 stash = NULL;
a5f75d66 1580 }
155aba94
GS		 1581 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1582 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1583 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
4633a7c4 1584 {
ecad31f0 1585 SV* namesv = newSVpvn_flags(name, len, SVs_TEMP | is_utf8);
fe13d51d 1586 /* diag_listed_as: Variable "%s" is not imported%s */
413ff9f6
FC		 1587 Perl_ck_warner_d(
1588 aTHX_ packWARN(WARN_MISC),
ecad31f0 1589 "Variable \"%c%"SVf"\" is not imported",
4633a7c4
LW		 1590 sv_type == SVt_PVAV ? '@' :
1591 sv_type == SVt_PVHV ? '%' : '$',
ecad31f0 1592 SVfARG(namesv));
8ebc5c01 1593 if (GvCVu(*gvp))
413ff9f6
FC		 1594 Perl_ck_warner_d(
1595 aTHX_ packWARN(WARN_MISC),
ecad31f0 1596 "\t(Did you mean &%"SVf" instead?)\n", SVfARG(namesv)
413ff9f6 1597 );
d4c19fe8 1598 stash = NULL;
4633a7c4 1599 }
a0d0e21e 1600 }
85e6fe83 1601 }
463ee0b2 1602 else
1d7c1841 1603 stash = CopSTASH(PL_curcop);
463ee0b2
LW		 1604 }
1605 else
3280af22 1606 stash = PL_defstash;
463ee0b2
LW		 1607 }
1608
1609 /* By this point we should have a stash and a name */
1610
a0d0e21e 1611 if (!stash) {
5a844595 1612 if (add) {
9d4ba2ae 1613 SV * const err = Perl_mess(aTHX_
ecad31f0 1614 "Global symbol \"%s%"SVf"\" requires explicit package name",
5a844595
GS		 1615 (sv_type == SVt_PV ? "$"
1616 : sv_type == SVt_PVAV ? "@"
1617 : sv_type == SVt_PVHV ? "%"
ecad31f0 1618 : ""), SVfARG(newSVpvn_flags(name, len, SVs_TEMP | is_utf8)));
e7f343b6 1619 GV *gv;
608b3986
AE		 1620 if (USE_UTF8_IN_NAMES)
1621 SvUTF8_on(err);
1622 qerror(err);
76f68e9b 1623 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
e7f343b6
NC		 1624 if(!gv) {
1625 /* symbol table under destruction */
1626 return NULL;
1627 }
1628 stash = GvHV(gv);
a0d0e21e 1629 }
d7aacf4e 1630 else
a0714e2c 1631 return NULL;
a0d0e21e
LW		 1632 }
1633
1634 if (!SvREFCNT(stash)) /* symbol table under destruction */
a0714e2c 1635 return NULL;
a0d0e21e 1636
0be4d16f 1637 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
23496c6e
FC		 1638 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
1639 if (addmg) gv = (GV *)newSV(0);
1640 else return NULL;
1641 }
914ecc63
FC		 1642 else gv = *gvp, addmg = 0;
1643 /* From this point on, addmg means gv has not been inserted in the
1644 symtab yet. */
1645
79072805 1646 if (SvTYPE(gv) == SVt_PVGV) {
a0d0e21e 1647 if (add) {
a5f75d66 1648 GvMULTI_on(gv);
e6066781 1649 gv_init_svtype(gv, sv_type);
b82b06b8
FC		 1650 if (len == 1 && stash == PL_defstash) {
1651 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
44a2ac75
YO		 1652 if (*name == '!')
1653 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
45cbc99a 1654 else if (*name == '-' || *name == '+')
192b9cd1 1655 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
b82b06b8 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;
1662 case '`':
1663 PL_sawampersand |= SAWAMPERSAND_LEFT;
1664 (void)GvSVn(gv);
1665 break;
1666 case '&':
1667 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
1668 (void)GvSVn(gv);
1669 break;
1670 case '\'':
1671 PL_sawampersand |= SAWAMPERSAND_RIGHT;
1672 (void)GvSVn(gv);
1673 break;
1674 }
a289ef89 1675 }
45cbc99a 1676 }
af16de9f
FC		 1677 else if (len == 3 && sv_type == SVt_PVAV
1678 && strnEQ(name, "ISA", 3)
1679 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
1680 gv_magicalize_isa(gv);
a0d0e21e 1681 }
79072805 1682 return gv;
add2581e 1683 } else if (no_init) {
23496c6e 1684 assert(!addmg);
55d729e4 1685 return gv;
e26df76a 1686 } else if (no_expand && SvROK(gv)) {
23496c6e 1687 assert(!addmg);
e26df76a 1688 return gv;
79072805 1689 }
93a17b20 1690
5e0caaeb
NC		 1691 /* Adding a new symbol.
1692 Unless of course there was already something non-GV here, in which case
1693 we want to behave as if there was always a GV here, containing some sort
1694 of subroutine.
1695 Otherwise we run the risk of creating things like GvIO, which can cause
1696 subtle bugs. eg the one that tripped up SQL::Translator */
1697
1698 faking_it = SvOK(gv);
93a17b20 1699
9b387841 1700 if (add & GV_ADDWARN)
ecad31f0 1701 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL), "Had to create %"SVf" unexpectedly",
f1c07be4 1702 SVfARG(newSVpvn_flags(nambeg, name_end-nambeg, SVs_TEMP | is_utf8 )));
04ec7e59 1703 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
93a17b20 1704
ecad31f0
BF		 1705 if ( isIDFIRST_lazy_if(name, is_utf8)
1706 && ! (isLEXWARN_on ? ckWARN(WARN_ONCE) : (PL_dowarn & G_WARN_ON ) ) )
0453d815
PM		 1707 GvMULTI_on(gv) ;
1708
93a17b20 1709 /* set up magic where warranted */
44428a46 1710 if (stash != PL_defstash) { /* not the main stash */
5fdfd519 1711 /* We only have to check for three names here: EXPORT, ISA
4aaa4757
FC		 1712 and VERSION. All the others apply only to the main stash or to
1713 CORE (which is checked right after this). */
f4e68e82 1714 if (len > 2) {
b464bac0 1715 const char * const name2 = name + 1;
cc4c2da6 1716 switch (*name) {
cc4c2da6
NC		 1717 case 'E':
1718 if (strnEQ(name2, "XPORT", 5))
1719 GvMULTI_on(gv);
1720 break;
1721 case 'I':
44428a46 1722 if (strEQ(name2, "SA"))
290a1700 1723 gv_magicalize_isa(gv);
cc4c2da6 1724 break;
44428a46
FC		 1725 case 'V':
1726 if (strEQ(name2, "ERSION"))
1727 GvMULTI_on(gv);
1728 break;
4aaa4757
FC		 1729 default:
1730 goto try_core;
1731 }
23496c6e 1732 goto add_magical_gv;
4aaa4757
FC		 1733 }
1734 try_core:
1735 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1736 /* Avoid null warning: */
1737 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1738 if (strnEQ(stashname, "CORE", 4))
1739 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1740 }
1741 }
1742 else if (len > 1) {
1743#ifndef EBCDIC
1744 if (*name > 'V' ) {
1745 NOOP;
1746 /* Nothing else to do.
1747 The compiler will probably turn the switch statement into a
1748 branch table. Make sure we avoid even that small overhead for
1749 the common case of lower case variable names. */
1750 } else
1751#endif
1752 {
1753 const char * const name2 = name + 1;
1754 switch (*name) {
1755 case 'A':
1756 if (strEQ(name2, "RGV")) {
1757 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1758 }
1759 else if (strEQ(name2, "RGVOUT")) {
1760 GvMULTI_on(gv);
1761 }
1762 break;
1763 case 'E':
1764 if (strnEQ(name2, "XPORT", 5))
1765 GvMULTI_on(gv);
1766 break;
1767 case 'I':
1768 if (strEQ(name2, "SA")) {
290a1700 1769 gv_magicalize_isa(gv);
44428a46
FC		 1770 }
1771 break;
cc4c2da6
NC		 1772 case 'S':
1773 if (strEQ(name2, "IG")) {
1774 HV *hv;
1775 I32 i;
d525a7b2
NC		 1776 if (!PL_psig_name) {
1777 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1778 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1779 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1780 } else {
1781 /* I think that the only way to get here is to re-use an
1782 embedded perl interpreter, where the previous
1783 use didn't clean up fully because
1784 PL_perl_destruct_level was 0. I'm not sure that we
1785 "support" that, in that I suspect in that scenario
1786 there are sufficient other garbage values left in the
1787 interpreter structure that something else will crash
1788 before we get here. I suspect that this is one of
1789 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1790 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1791 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1792 }
1793 GvMULTI_on(gv);
1794 hv = GvHVn(gv);
a0714e2c 1795 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1796 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1797 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1798 if (init)
1799 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1800 }
1801 }
1802 break;
1803 case 'V':
1804 if (strEQ(name2, "ERSION"))
1805 GvMULTI_on(gv);
1806 break;
e5218da5
GA		 1807 case '\003': /* $^CHILD_ERROR_NATIVE */
1808 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1809 goto magicalize;
1810 break;
cc4c2da6
NC		 1811 case '\005': /* $^ENCODING */
1812 if (strEQ(name2, "NCODING"))
1813 goto magicalize;
1814 break;
9ebf26ad
FR		 1815 case '\007': /* $^GLOBAL_PHASE */
1816 if (strEQ(name2, "LOBAL_PHASE"))
1817 goto ro_magicalize;
1818 break;
cde0cee5
YO		 1819 case '\015': /* $^MATCH */
1820 if (strEQ(name2, "ATCH"))
2fdbfb4d 1821 goto magicalize;
cc4c2da6
NC		 1822 case '\017': /* $^OPEN */
1823 if (strEQ(name2, "PEN"))
1824 goto magicalize;
1825 break;
cde0cee5
YO		 1826 case '\020': /* $^PREMATCH $^POSTMATCH */
1827 if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH"))
9ebf26ad
FR		 1828 goto magicalize;
1829 break;
cc4c2da6
NC		 1830 case '\024': /* ${^TAINT} */
1831 if (strEQ(name2, "AINT"))
1832 goto ro_magicalize;
1833 break;
7cebcbc0 1834 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1835 if (strEQ(name2, "NICODE"))
cc4c2da6 1836 goto ro_magicalize;
a0288114 1837 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1838 goto ro_magicalize;
e07ea26a
NC		 1839 if (strEQ(name2, "TF8CACHE"))
1840 goto magicalize;
cc4c2da6
NC		 1841 break;
1842 case '\027': /* $^WARNING_BITS */
1843 if (strEQ(name2, "ARNING_BITS"))
1844 goto magicalize;
1845 break;
1846 case '1':
1847 case '2':
1848 case '3':
1849 case '4':
1850 case '5':
1851 case '6':
1852 case '7':
1853 case '8':
1854 case '9':
85e6fe83 1855 {
2fdbfb4d
AB		 1856 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1857 this test */
1858 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC		 1859 const char *end = name + len;
1860 while (--end > name) {
23496c6e 1861 if (!isDIGIT(*end)) goto add_magical_gv;
cc4c2da6 1862 }
2fdbfb4d 1863 goto magicalize;
1d7c1841 1864 }
dc437b57 1865 }
93a17b20 1866 }
392db708
NC		 1867 } else {
1868 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1869 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1870 switch (*name) {
6361f656
AB		 1871 case '&': /* $& */
1872 case '`': /* $` */
1873 case '\'': /* $' */
a289ef89 1874 if (!(
cc4c2da6
NC		 1875 sv_type == SVt_PVAV ||
1876 sv_type == SVt_PVHV ||
1877 sv_type == SVt_PVCV ||
1878 sv_type == SVt_PVFM ||
1879 sv_type == SVt_PVIO
d3b97530
DM		 1880 )) { PL_sawampersand |=
1881 (*name == '`')
1882 ? SAWAMPERSAND_LEFT
1883 : (*name == '&')
1884 ? SAWAMPERSAND_MIDDLE
1885 : SAWAMPERSAND_RIGHT;
1886 }
2fdbfb4d 1887 goto magicalize;
cc4c2da6 1888
6361f656 1889 case ':': /* $: */
c69033f2 1890 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 1891 goto magicalize;
1892
6361f656 1893 case '?': /* $? */
ff0cee69 1894#ifdef COMPLEX_STATUS
c69033f2 1895 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1896#endif
cc4c2da6 1897 goto magicalize;
ff0cee69 1898
6361f656 1899 case '!': /* $! */
67261566 1900 GvMULTI_on(gv);
44a2ac75 1901 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1902
ad64d0ec 1903 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1904
44a2ac75 1905 /* magicalization must be done before require_tie_mod is called */
67261566 1906 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd
FC		 1907 {
1908 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1909 addmg = 0;
44a2ac75 1910 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
ffdb8bcd 1911 }
d2c93421 1912
6cef1e77 1913 break;
6361f656
AB		 1914 case '-': /* $- */
1915 case '+': /* $+ */
44a2ac75
YO		 1916 GvMULTI_on(gv); /* no used once warnings here */
1917 {
44a2ac75 1918 AV* const av = GvAVn(gv);
ad64d0ec 1919 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1920
ad64d0ec
NC		 1921 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1922 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1923 if (avc)
44a2ac75 1924 SvREADONLY_on(GvSVn(gv));
44a2ac75 1925 SvREADONLY_on(av);
67261566
YO		 1926
1927 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4
FC		 1928 {
1929 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1930 addmg = 0;
192b9cd1 1931 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
213084e4 1932 }
67261566 1933
80305961 1934 break;
cc4c2da6 1935 }
6361f656
AB		 1936 case '*': /* $* */
1937 case '#': /* $# */
9b387841 1938 if (sv_type == SVt_PV)
dcbac5bb 1939 /* diag_listed_as: $* is no longer supported */
9b387841
NC		 1940 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
1941 "$%c is no longer supported", *name);
8ae1fe26 1942 break;
6361f656 1943 case '|': /* $| */
c69033f2 1944 sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0);
cc4c2da6
NC		 1945 goto magicalize;
1946
b3ca2e83
NC		 1947 case '\010': /* $^H */
1948 {
1949 HV *const hv = GvHVn(gv);
1950 hv_magic(hv, NULL, PERL_MAGIC_hints);
1951 }
1952 goto magicalize;
b82b06b8 1953 case '[': /* $[ */
7d69d4a6 1954 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1955 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8
FC		 1956 if (addmg) (void)hv_store(stash,name,len,(SV *)gv,0);
1957 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
1958 addmg = 0;
1959 }
7d69d4a6 1960 else goto magicalize;
b82b06b8 1961 break;
cc4c2da6 1962 case '\023': /* $^S */
2fdbfb4d
AB		 1963 ro_magicalize:
1964 SvREADONLY_on(GvSVn(gv));
1965 /* FALL THROUGH */
6361f656
AB		 1966 case '0': /* $0 */
1967 case '1': /* $1 */
1968 case '2': /* $2 */
1969 case '3': /* $3 */
1970 case '4': /* $4 */
1971 case '5': /* $5 */
1972 case '6': /* $6 */
1973 case '7': /* $7 */
1974 case '8': /* $8 */
1975 case '9': /* $9 */
6361f656
AB		 1976 case '^': /* $^ */
1977 case '~': /* $~ */
1978 case '=': /* $= */
1979 case '%': /* $% */
1980 case '.': /* $. */
1981 case '(': /* $( */
1982 case ')': /* $) */
1983 case '<': /* $< */
1984 case '>': /* $> */
1985 case '\\': /* $\ */
1986 case '/': /* $/ */
9cdac2a2 1987 case '$': /* $$ */
cc4c2da6
NC		 1988 case '\001': /* $^A */
1989 case '\003': /* $^C */
1990 case '\004': /* $^D */
1991 case '\005': /* $^E */
1992 case '\006': /* $^F */
cc4c2da6
NC		 1993 case '\011': /* $^I, NOT \t in EBCDIC */
1994 case '\016': /* $^N */
1995 case '\017': /* $^O */
1996 case '\020': /* $^P */
1997 case '\024': /* $^T */
1998 case '\027': /* $^W */
1999 magicalize:
ad64d0ec 2000 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2001 break;
e521374c 2002
cc4c2da6 2003 case '\014': /* $^L */
76f68e9b 2004 sv_setpvs(GvSVn(gv),"\f");
17e63098 2005 PL_formfeed = GvSV(gv);
463ee0b2 2006 break;
6361f656 2007 case ';': /* $; */
76f68e9b 2008 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2009 break;
6361f656 2010 case ']': /* $] */
cc4c2da6 2011 {
3638bf15 2012 SV * const sv = GvSV(gv);
d7aa5382 2013 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2014 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2015 GvSV(gv) = vnumify(PL_patchlevel);
2016 SvREADONLY_on(GvSV(gv));
2017 SvREFCNT_dec(sv);
93a17b20
LW		 2018 }
2019 break;
cc4c2da6
NC		 2020 case '\026': /* $^V */
2021 {
3638bf15 2022 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2023 GvSV(gv) = new_version(PL_patchlevel);
2024 SvREADONLY_on(GvSV(gv));
2025 SvREFCNT_dec(sv);
16070b82
GS		 2026 }
2027 break;
cc4c2da6 2028 }
79072805 2029 }
23496c6e
FC		 2030 add_magical_gv:
2031 if (addmg) {
2032 if (GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv) || (
2033 GvSV(gv) && (SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv)))
2034 ))
0f43181e 2035 (void)hv_store(stash,name,len,(SV *)gv,0);
23496c6e
FC		 2036 else SvREFCNT_dec(gv), gv = NULL;
2037 }
e6066781 2038 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2039 return gv;
79072805
LW		 2040}
2041
2042void
35a4481c 2043Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2044{
ed60a868 2045 const char *name;
35a4481c 2046 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2047
2048 PERL_ARGS_ASSERT_GV_FULLNAME4;
2049
666ea192 2050 sv_setpv(sv, prefix ? prefix : "");
a0288114 2051
52a6327b 2052 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2053 const STRLEN len = HvNAMELEN(hv);
2054 if (keepmain || strnNE(name, "main", len)) {
2055 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2056 sv_catpvs(sv,"::");
ed60a868 2057 }
43693395 2058 }
ed60a868 2059 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2060 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2061}
2062
2063void
35a4481c 2064Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2065{
099be4f1 2066 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2067
2068 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2069
46c461b5 2070 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2071}
2072
79072805 2073void
1146e912 2074Perl_gv_check(pTHX_ const HV *stash)
79072805 2075{
97aff369 2076 dVAR;
eb578fdb 2077 I32 i;
463ee0b2 2078
7918f24d
NC		 2079 PERL_ARGS_ASSERT_GV_CHECK;
2080
8990e307
LW		 2081 if (!HvARRAY(stash))
2082 return;
a0d0e21e 2083 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2084 const HE *entry;
dc437b57 2085 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2086 GV *gv;
b7787f18 2087 HV *hv;
dc437b57 2088 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2089 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2090 {
19b6c847 2091 if (hv != PL_defstash && hv != stash)
a0d0e21e
LW		 2092 gv_check(hv); /* nested package */
2093 }
ecad31f0
BF		 2094 else if ( *HeKEY(entry) != '_'
2095 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2096 const char *file;
159b6efe 2097 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2098 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2099 continue;
1d7c1841 2100 file = GvFILE(gv);
1d7c1841
GS		 2101 CopLINE_set(PL_curcop, GvLINE(gv));
2102#ifdef USE_ITHREADS
dd374669 2103 CopFILE(PL_curcop) = (char *)file; /* set for warning */
1d7c1841 2104#else
9bde8eb0
NC		 2105 CopFILEGV(PL_curcop)
2106 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
1d7c1841 2107#endif
9014280d 2108 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2109 "Name \"%"HEKf"::%"HEKf
2110 "\" used only once: possible typo",
2111 HEKfARG(HvNAME_HEK(stash)),
2112 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2113 }
79072805
LW		 2114 }
2115 }
2116}
2117
2118GV *
9cc50d5b 2119Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2120{
97aff369 2121 dVAR;
9cc50d5b 2122 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
7918f24d 2123
9cc50d5b
BF		 2124 return gv_fetchpv(Perl_form(aTHX_ "%"SVf"::_GEN_%ld",
2125 SVfARG(newSVpvn_flags(pack, strlen(pack),
2126 SVs_TEMP | flags)),
2127 (long)PL_gensym++),
2128 GV_ADD, SVt_PVGV);
79072805
LW		 2129}
2130
2131/* hopefully this is only called on local symbol table entries */
2132
2133GP*
864dbfa3 2134Perl_gp_ref(pTHX_ GP *gp)
79072805 2135{
97aff369 2136 dVAR;
1d7c1841 2137 if (!gp)
d4c19fe8 2138 return NULL;
79072805 2139 gp->gp_refcnt++;
44a8e56a 2140 if (gp->gp_cv) {
2141 if (gp->gp_cvgen) {
e1a479c5
BB		 2142 /* If the GP they asked for a reference to contains
2143 a method cache entry, clear it first, so that we
2144 don't infect them with our cached entry */
44a8e56a 2145 SvREFCNT_dec(gp->gp_cv);
601f1833 2146 gp->gp_cv = NULL;
44a8e56a 2147 gp->gp_cvgen = 0;
2148 }
44a8e56a 2149 }
79072805 2150 return gp;
79072805
LW		 2151}
2152
2153void
864dbfa3 2154Perl_gp_free(pTHX_ GV *gv)
79072805 2155{
97aff369 2156 dVAR;
79072805 2157 GP* gp;
b0d55c99 2158 int attempts = 100;
79072805 2159
f7877b28 2160 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2161 return;
f248d071 2162 if (gp->gp_refcnt == 0) {
9b387841
NC		 2163 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2164 "Attempt to free unreferenced glob pointers"
2165 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2166 return;
2167 }
748a9306
LW		 2168 if (--gp->gp_refcnt > 0) {
2169 if (gp->gp_egv == gv)
2170 gp->gp_egv = 0;
c43ae56f 2171 GvGP_set(gv, NULL);
79072805 2172 return;
748a9306 2173 }
79072805 2174
b0d55c99
FC		 2175 while (1) {
2176 /* Copy and null out all the glob slots, so destructors do not see
2177 freed SVs. */
2178 HEK * const file_hek = gp->gp_file_hek;
2179 SV * const sv = gp->gp_sv;
2180 AV * const av = gp->gp_av;
2181 HV * const hv = gp->gp_hv;
2182 IO * const io = gp->gp_io;
2183 CV * const cv = gp->gp_cv;
2184 CV * const form = gp->gp_form;
2185
2186 gp->gp_file_hek = NULL;
2187 gp->gp_sv = NULL;
2188 gp->gp_av = NULL;
2189 gp->gp_hv = NULL;
2190 gp->gp_io = NULL;
2191 gp->gp_cv = NULL;
2192 gp->gp_form = NULL;
2193
2194 if (file_hek)
2195 unshare_hek(file_hek);
2196
2197 SvREFCNT_dec(sv);
2198 SvREFCNT_dec(av);
2199 /* FIXME - another reference loop GV -> symtab -> GV ?
2200 Somehow gp->gp_hv can end up pointing at freed garbage. */
2201 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065
BF		 2202 const HEK *hvname_hek = HvNAME_HEK(hv);
2203 if (PL_stashcache && hvname_hek)
2204 (void)hv_delete(PL_stashcache, HEK_KEY(hvname_hek),
2205 (HEK_UTF8(hvname_hek) ? -HEK_LEN(hvname_hek) : HEK_LEN(hvname_hek)),
2206 G_DISCARD);
b0d55c99
FC		 2207 SvREFCNT_dec(hv);
2208 }
2209 SvREFCNT_dec(io);
2210 SvREFCNT_dec(cv);
2211 SvREFCNT_dec(form);
2212
2213 if (!gp->gp_file_hek
2214 && !gp->gp_sv
2215 && !gp->gp_av
2216 && !gp->gp_hv
2217 && !gp->gp_io
2218 && !gp->gp_cv
2219 && !gp->gp_form) break;
2220
2221 if (--attempts == 0) {
2222 Perl_die(aTHX_
2223 "panic: gp_free failed to free glob pointer - "
2224 "something is repeatedly re-creating entries"
2225 );
2226 }
13207a71 2227 }
748a9306 2228
79072805 2229 Safefree(gp);
c43ae56f 2230 GvGP_set(gv, NULL);
79072805
LW		 2231}
2232
d460ef45
NIS		 2233int
2234Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2235{
53c1dcc0
AL		 2236 AMT * const amtp = (AMT*)mg->mg_ptr;
2237 PERL_UNUSED_ARG(sv);
dd374669 2238
7918f24d
NC		 2239 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2240
d460ef45
NIS		 2241 if (amtp && AMT_AMAGIC(amtp)) {
2242 int i;
2243 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2244 CV * const cv = amtp->table[i];
b37c2d43 2245 if (cv) {
ad64d0ec 2246 SvREFCNT_dec(MUTABLE_SV(cv));
601f1833 2247 amtp->table[i] = NULL;
d460ef45
NIS		 2248 }
2249 }
2250 }
2251 return 0;
2252}
2253
a0d0e21e 2254/* Updates and caches the CV's */
c3a9a790
RGS		 2255/* Returns:
2256 * 1 on success and there is some overload
2257 * 0 if there is no overload
2258 * -1 if some error occurred and it couldn't croak
2259 */
a0d0e21e 2260
c3a9a790 2261int
242f8760 2262Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2263{
97aff369 2264 dVAR;
ad64d0ec 2265 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2266 AMT amt;
9b439311 2267 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2268 U32 newgen;
a0d0e21e 2269
7918f24d
NC		 2270 PERL_ARGS_ASSERT_GV_AMUPDATE;
2271
9b439311 2272 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2273 if (mg) {
2274 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2275 if (amtp->was_ok_sub == newgen) {
c3a9a790 2276 return AMT_OVERLOADED(amtp) ? 1 : 0;
14899595 2277 }
ad64d0ec 2278 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2279 }
a0d0e21e 2280
bfcb3514 2281 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2282
d460ef45 2283 Zero(&amt,1,AMT);
e1a479c5 2284 amt.was_ok_sub = newgen;
a6006777 2285 amt.fallback = AMGfallNO;
2286 amt.flags = 0;
2287
a6006777 2288 {
32251b26
IZ		 2289 int filled = 0, have_ovl = 0;
2290 int i, lim = 1;
a6006777 2291
3866ea3b 2292 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2293
89ffc314 2294 /* Try to find via inheritance. */
e6919483 2295 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2296 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2297 CV* cv;
89ffc314
IZ		 2298
2299 if (!gv)
3866ea3b
FC		 2300 {
2301 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
32251b26 2302 lim = DESTROY_amg; /* Skip overloading entries. */
3866ea3b
FC		 2303 }
2304#ifdef PERL_DONT_CREATE_GVSV
2305 else if (!sv) {
6f207bd3 2306 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2307 }
2308#endif
79c9643d
JL		 2309 else if (SvTRUE(sv))
2310 /* don't need to set overloading here because fallback => 1
2311 * is the default setting for classes without overloading */
89ffc314 2312 amt.fallback=AMGfallYES;
79c9643d
JL		 2313 else if (SvOK(sv)) {
2314 amt.fallback=AMGfallNEVER;
386a5489
JL		 2315 filled = 1;
2316 have_ovl = 1;
2317 }
79c9643d 2318 else {
386a5489
JL		 2319 filled = 1;
2320 have_ovl = 1;
2321 }
a6006777 2322
32251b26 2323 for (i = 1; i < lim; i++)
601f1833 2324 amt.table[i] = NULL;
32251b26 2325 for (; i < NofAMmeth; i++) {
6136c704 2326 const char * const cooky = PL_AMG_names[i];
32251b26 2327 /* Human-readable form, for debugging: */
6136c704 2328 const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i));
d279ab82 2329 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2330
a0288114 2331 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2332 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2333 /* don't fill the cache while looking up!
2334 Creation of inheritance stubs in intermediate packages may
2335 conflict with the logic of runtime method substitution.
2336 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2337 then we could have created stubs for "(+0" in A and C too.
2338 But if B overloads "bool", we may want to use it for
2339 numifying instead of C's "+0". */
2340 if (i >= DESTROY_amg)
d21989ed 2341 gv = Perl_gv_fetchmeth_pvn_autoload(aTHX_ stash, cooky, l, 0, 0);
611c1e95 2342 else /* Autoload taken care of below */
e6919483 2343 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2344 cv = 0;
89ffc314 2345 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC		 2346 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2347 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2348 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2349 && strEQ(hvname, "overload")) {
611c1e95
IZ		 2350 /* This is a hack to support autoloading..., while
2351 knowing *which* methods were declared as overloaded. */
44a8e56a 2352 /* GvSV contains the name of the method. */
6136c704 2353 GV *ngv = NULL;
c69033f2 2354 SV *gvsv = GvSV(gv);
a0288114
AL		 2355
2356 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2357 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2358 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2359 if (!gvsv || !SvPOK(gvsv)
7f415459 2360 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2361 {
a0288114 2362 /* Can be an import stub (created by "can"). */
242f8760 2363 if (destructing) {
c3a9a790 2364 return -1;
242f8760
RGS		 2365 }
2366 else {
d66cca07
BF		 2367 const SV * const name = (gvsv && SvPOK(gvsv))
2368 ? gvsv
2369 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2370 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2371 Perl_croak(aTHX_ "%s method \"%"SVf256
2372 "\" overloading \"%s\" "\
d0c0e7dd 2373 "in package \"%"HEKf256"\"",
242f8760
RGS		 2374 (GvCVGEN(gv) ? "Stub found while resolving"
2375 : "Can't resolve"),
d66cca07 2376 SVfARG(name), cp,
d0c0e7dd 2377 HEKfARG(
d66cca07 2378 HvNAME_HEK(stash)
d0c0e7dd 2379 ));
242f8760 2380 }
44a8e56a 2381 }
dc848c6f 2382 cv = GvCV(gv = ngv);
f0e9f182 2383 }
44a8e56a 2384 }
b464bac0 2385 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2386 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2387 GvNAME(CvGV(cv))) );
2388 filled = 1;
32251b26
IZ		 2389 if (i < DESTROY_amg)
2390 have_ovl = 1;
611c1e95 2391 } else if (gv) { /* Autoloaded... */
ea726b52 2392 cv = MUTABLE_CV(gv);
611c1e95 2393 filled = 1;
44a8e56a 2394 }
ea726b52 2395 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
a0d0e21e 2396 }
a0d0e21e 2397 if (filled) {
a6006777 2398 AMT_AMAGIC_on(&amt);
32251b26
IZ		 2399 if (have_ovl)
2400 AMT_OVERLOADED_on(&amt);
ad64d0ec 2401 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2402 (char*)&amt, sizeof(AMT));
32251b26 2403 return have_ovl;
a0d0e21e
LW		 2404 }
2405 }
a6006777 2406 /* Here we have no table: */
9cbac4c7 2407 /* no_table: */
a6006777 2408 AMT_AMAGIC_off(&amt);
ad64d0ec 2409 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2410 (char*)&amt, sizeof(AMTS));
c3a9a790 2411 return 0;
a0d0e21e
LW		 2412}
2413
32251b26
IZ		 2414
2415CV*
2416Perl_gv_handler(pTHX_ HV *stash, I32 id)
2417{
97aff369 2418 dVAR;
3f8f4626 2419 MAGIC *mg;
32251b26 2420 AMT *amtp;
e1a479c5 2421 U32 newgen;
9b439311 2422 struct mro_meta* stash_meta;
32251b26 2423
bfcb3514 2424 if (!stash || !HvNAME_get(stash))
601f1833 2425 return NULL;
e1a479c5 2426
9b439311
BB		 2427 stash_meta = HvMROMETA(stash);
2428 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2429
ad64d0ec 2430 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2431 if (!mg) {
2432 do_update:
242f8760
RGS		 2433 /* If we're looking up a destructor to invoke, we must avoid
2434 * that Gv_AMupdate croaks, because we might be dying already */
2dcac756 2435 if (Gv_AMupdate(stash, cBOOL(id == DESTROY_amg)) == -1) {
242f8760
RGS		 2436 /* and if it didn't found a destructor, we fall back
2437 * to a simpler method that will only look for the
2438 * destructor instead of the whole magic */
2439 if (id == DESTROY_amg) {
2440 GV * const gv = gv_fetchmethod(stash, "DESTROY");
2441 if (gv)
2442 return GvCV(gv);
2443 }
2444 return NULL;
2445 }
ad64d0ec 2446 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2447 }
a9fd4e40 2448 assert(mg);
32251b26 2449 amtp = (AMT*)mg->mg_ptr;
66978156 2450 if ( amtp->was_ok_sub != newgen )
32251b26 2451 goto do_update;
3ad83ce7 2452 if (AMT_AMAGIC(amtp)) {
b7787f18 2453 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2454 if (ret && isGV(ret)) { /* Autoloading stab */
2455 /* Passing it through may have resulted in a warning
2456 "Inherited AUTOLOAD for a non-method deprecated", since
2457 our caller is going through a function call, not a method call.
2458 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2459 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2460
2461 if (gv && GvCV(gv))
2462 return GvCV(gv);
2463 }
2464 return ret;
2465 }
a0288114 2466
601f1833 2467 return NULL;
32251b26
IZ		 2468}
2469
2470
6f1401dc
DM		 2471/* Implement tryAMAGICun_MG macro.
2472 Do get magic, then see if the stack arg is overloaded and if so call it.
2473 Flags:
2474 AMGf_set return the arg using SETs rather than assigning to
2475 the targ
2476 AMGf_numeric apply sv_2num to the stack arg.
2477*/
2478
2479bool
2480Perl_try_amagic_un(pTHX_ int method, int flags) {
2481 dVAR;
2482 dSP;
2483 SV* tmpsv;
2484 SV* const arg = TOPs;
2485
2486 SvGETMAGIC(arg);
2487
9f8bf298
NC		 2488 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2489 AMGf_noright | AMGf_unary))) {
6f1401dc
DM		 2490 if (flags & AMGf_set) {
2491 SETs(tmpsv);
2492 }
2493 else {
2494 dTARGET;
2495 if (SvPADMY(TARG)) {
2496 sv_setsv(TARG, tmpsv);
2497 SETTARG;
2498 }
2499 else
2500 SETs(tmpsv);
2501 }
2502 PUTBACK;
2503 return TRUE;
2504 }
2505
2506 if ((flags & AMGf_numeric) && SvROK(arg))
2507 *sp = sv_2num(arg);
2508 return FALSE;
2509}
2510
2511
2512/* Implement tryAMAGICbin_MG macro.
2513 Do get magic, then see if the two stack args are overloaded and if so
2514 call it.
2515 Flags:
2516 AMGf_set return the arg using SETs rather than assigning to
2517 the targ
2518 AMGf_assign op may be called as mutator (eg +=)
2519 AMGf_numeric apply sv_2num to the stack arg.
2520*/
2521
2522bool
2523Perl_try_amagic_bin(pTHX_ int method, int flags) {
2524 dVAR;
2525 dSP;
2526 SV* const left = TOPm1s;
2527 SV* const right = TOPs;
2528
2529 SvGETMAGIC(left);
2530 if (left != right)
2531 SvGETMAGIC(right);
2532
2533 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2534 SV * const tmpsv = amagic_call(left, right, method,
2535 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2536 if (tmpsv) {
2537 if (flags & AMGf_set) {
2538 (void)POPs;
2539 SETs(tmpsv);
2540 }
2541 else {
2542 dATARGET;
2543 (void)POPs;
2544 if (opASSIGN || SvPADMY(TARG)) {
2545 sv_setsv(TARG, tmpsv);
2546 SETTARG;
2547 }
2548 else
2549 SETs(tmpsv);
2550 }
2551 PUTBACK;
2552 return TRUE;
2553 }
2554 }
75ea7a12
FC		 2555 if(left==right && SvGMAGICAL(left)) {
2556 SV * const left = sv_newmortal();
2557 *(sp-1) = left;
2558 /* Print the uninitialized warning now, so it includes the vari-
2559 able name. */
2560 if (!SvOK(right)) {
2561 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2562 sv_setsv_flags(left, &PL_sv_no, 0);
2563 }
2564 else sv_setsv_flags(left, right, 0);
2565 SvGETMAGIC(right);
2566 }
6f1401dc 2567 if (flags & AMGf_numeric) {
75ea7a12
FC		 2568 if (SvROK(TOPm1s))
2569 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2570 if (SvROK(right))
2571 *sp = sv_2num(right);
2572 }
2573 return FALSE;
2574}
2575
25a9ffce
NC		 2576SV *
2577Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2578 SV *tmpsv = NULL;
2579
2580 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2581
2582 while (SvAMAGIC(ref) &&
2583 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2584 AMGf_noright | AMGf_unary))) {
2585 if (!SvROK(tmpsv))
2586 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2587 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2588 /* Bail out if it returns us the same reference. */
2589 return tmpsv;
2590 }
2591 ref = tmpsv;
2592 }
2593 return tmpsv ? tmpsv : ref;
2594}
6f1401dc 2595
8d569291
FC		 2596bool
2597Perl_amagic_is_enabled(pTHX_ int method)
2598{
2599 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2600
2601 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2602
2603 if ( !lex_mask || !SvOK(lex_mask) )
2604 /* overloading lexically disabled */
2605 return FALSE;
2606 else if ( lex_mask && SvPOK(lex_mask) ) {
2607 /* we have an entry in the hints hash, check if method has been
2608 * masked by overloading.pm */
2609 STRLEN len;
2610 const int offset = method / 8;
2611 const int bit = method % 8;
2612 char *pv = SvPV(lex_mask, len);
2613
2614 /* Bit set, so this overloading operator is disabled */
2615 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2616 return FALSE;
2617 }
2618 return TRUE;
2619}
2620
a0d0e21e 2621SV*
864dbfa3 2622Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2623{
27da23d5 2624 dVAR;
b267980d 2625 MAGIC *mg;
9c5ffd7c 2626 CV *cv=NULL;
a0d0e21e 2627 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2628 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 2629 int off = 0, off1, lr = 0, notfound = 0;
2630 int postpr = 0, force_cpy = 0;
2631 int assign = AMGf_assign & flags;
2632 const int assignshift = assign ? 1 : 0;
bf5522a1 2633 int use_default_op = 0;
67288365 2634 int force_scalar = 0;
497b47a8
JH		 2635#ifdef DEBUGGING
2636 int fl=0;
497b47a8 2637#endif
25716404 2638 HV* stash=NULL;
7918f24d
NC		 2639
2640 PERL_ARGS_ASSERT_AMAGIC_CALL;
2641
e46c382e 2642 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2643 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 2644 }
2645
a0d0e21e 2646 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2647 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2648 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2649 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2650 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2651 : NULL))
b267980d 2652 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 2653 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2654 * usual method */
497b47a8
JH		 2655 (
2656#ifdef DEBUGGING
2657 fl = 1,
a0288114 2658#endif
497b47a8 2659 cv = cvp[off=method])))) {
a0d0e21e
LW		 2660 lr = -1; /* Call method for left argument */
2661 } else {
2662 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2663 int logic;
2664
2665 /* look for substituted methods */
ee239bfe 2666 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 2667 switch (method) {
2668 case inc_amg:
ee239bfe
IZ		 2669 force_cpy = 1;
2670 if ((cv = cvp[off=add_ass_amg])
2671 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2672 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2673 }
2674 break;
2675 case dec_amg:
ee239bfe
IZ		 2676 force_cpy = 1;
2677 if ((cv = cvp[off = subtr_ass_amg])
2678 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2679 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2680 }
2681 break;
2682 case bool__amg:
2683 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2684 break;
2685 case numer_amg:
2686 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2687 break;
2688 case string_amg:
2689 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2690 break;
b7787f18
AL		 2691 case not_amg:
2692 (void)((cv = cvp[off=bool__amg])
2693 || (cv = cvp[off=numer_amg])
2694 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 2695 if (cv)
2696 postpr = 1;
b7787f18 2697 break;
748a9306
LW		 2698 case copy_amg:
2699 {
76e3520e
GS		 2700 /*
2701 * SV* ref causes confusion with the interpreter variable of
2702 * the same name
2703 */
890ce7af 2704 SV* const tmpRef=SvRV(left);
76e3520e 2705 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 2706 /*
2707 * Just to be extra cautious. Maybe in some
2708 * additional cases sv_setsv is safe, too.
2709 */
890ce7af 2710 SV* const newref = newSVsv(tmpRef);
748a9306 2711 SvOBJECT_on(newref);
a1cd65be
FC		 2712 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2713 delegate to the stash. */
85fbaab2 2714 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 2715 return newref;
2716 }
2717 }
2718 break;
a0d0e21e 2719 case abs_amg:
b267980d 2720 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2721 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2722 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2723 if (off1==lt_amg) {
890ce7af 2724 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2725 lt_amg,AMGf_noright);
2726 logic = SvTRUE(lessp);
2727 } else {
890ce7af 2728 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2729 ncmp_amg,AMGf_noright);
2730 logic = (SvNV(lessp) < 0);
2731 }
2732 if (logic) {
2733 if (off==subtr_amg) {
2734 right = left;
748a9306 2735 left = nullsv;
a0d0e21e
LW		 2736 lr = 1;
2737 }
2738 } else {
2739 return left;
2740 }
2741 }
2742 break;
2743 case neg_amg:
155aba94 2744 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 2745 right = left;
2746 left = sv_2mortal(newSViv(0));
2747 lr = 1;
2748 }
2749 break;
f216259d 2750 case int_amg:
f5284f61 2751 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2752 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2753 case regexp_amg:
b267980d
NIS		 2754 /* FAIL safe */
2755 return NULL; /* Delegate operation to standard mechanisms. */
2756 break;
f5284f61
IZ		 2757 case to_sv_amg:
2758 case to_av_amg:
2759 case to_hv_amg:
2760 case to_gv_amg:
2761 case to_cv_amg:
2762 /* FAIL safe */
b267980d 2763 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2764 break;
a0d0e21e
LW		 2765 default:
2766 goto not_found;
2767 }
2768 if (!cv) goto not_found;
2769 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2770 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2771 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2772 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2773 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2774 : NULL))
f041cf0f
RGS		 2775 && ((cv = cvp[off=method+assignshift])
2776 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2777 * usual method */
2778 (
2779#ifdef DEBUGGING
2780 fl = 1,
2781#endif
2782 cv = cvp[off=method])))) { /* Method for right
2783 * argument found */
2784 lr=1;
bf5522a1
MB		 2785 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2786 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 2787 && !(flags & AMGf_unary)) {
2788 /* We look for substitution for
2789 * comparison operations and
fc36a67e 2790 * concatenation */
a0d0e21e
LW		 2791 if (method==concat_amg || method==concat_ass_amg
2792 || method==repeat_amg || method==repeat_ass_amg) {
2793 return NULL; /* Delegate operation to string conversion */
2794 }
2795 off = -1;
2796 switch (method) {
2797 case lt_amg:
2798 case le_amg:
2799 case gt_amg:
2800 case ge_amg:
2801 case eq_amg:
2802 case ne_amg:
2ab54efd
MB		 2803 off = ncmp_amg;
2804 break;
a0d0e21e
LW		 2805 case slt_amg:
2806 case sle_amg:
2807 case sgt_amg:
2808 case sge_amg:
2809 case seq_amg:
2810 case sne_amg:
2ab54efd
MB		 2811 off = scmp_amg;
2812 break;
a0d0e21e 2813 }
bf5522a1
MB		 2814 if (off != -1) {
2815 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2816 cv = ocvp[off];
2817 lr = -1;
2818 }
2819 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2820 cv = cvp[off];
2821 lr = 1;
2822 }
2823 }
2824 if (cv)
2ab54efd
MB		 2825 postpr = 1;
2826 else
2827 goto not_found;
a0d0e21e 2828 } else {
a6006777 2829 not_found: /* No method found, either report or croak */
b267980d
NIS		 2830 switch (method) {
2831 case to_sv_amg:
2832 case to_av_amg:
2833 case to_hv_amg:
2834 case to_gv_amg:
2835 case to_cv_amg:
2836 /* FAIL safe */
2837 return left; /* Delegate operation to standard mechanisms. */
2838 break;
2839 }
a0d0e21e
LW		 2840 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2841 notfound = 1; lr = -1;
2842 } else if (cvp && (cv=cvp[nomethod_amg])) {
2843 notfound = 1; lr = 1;
bf5522a1
MB		 2844 } else if ((use_default_op =
2845 (!ocvp || oamtp->fallback >= AMGfallYES)
2846 && (!cvp || amtp->fallback >= AMGfallYES))
2847 && !DEBUG_o_TEST) {
4cc0ca18
NC		 2848 /* Skip generating the "no method found" message. */
2849 return NULL;
a0d0e21e 2850 } else {
46fc3d4c 2851 SV *msg;
774d564b 2852 if (off==-1) off=method;
b267980d 2853 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 2854 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
2855 AMG_id2name(method + assignshift),
2856 (flags & AMGf_unary ? " " : "\n\tleft "),
2857 SvAMAGIC(left)?
2858 "in overloaded package ":
2859 "has no overloaded magic",
2860 SvAMAGIC(left)?
2861 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
2862 SVfARG(&PL_sv_no),
2863 SvAMAGIC(right)?
2864 ",\n\tright argument in overloaded package ":
2865 (flags & AMGf_unary
2866 ? ""
2867 : ",\n\tright argument has no overloaded magic"),
2868 SvAMAGIC(right)?
2869 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
2870 SVfARG(&PL_sv_no)));
bf5522a1 2871 if (use_default_op) {
d66cca07 2872 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 2873 } else {
be2597df 2874 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 2875 }
2876 return NULL;
2877 }
ee239bfe 2878 force_cpy = force_cpy || assign;
a0d0e21e
LW		 2879 }
2880 }
67288365
JL		 2881
2882 switch (method) {
2883 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
2884 * operation. we need this to return a value, so that it can be assigned
2885 * later on, in the postpr block (case inc_amg/dec_amg), even if the
2886 * increment or decrement was itself called in void context */
2887 case inc_amg:
2888 if (off == add_amg)
2889 force_scalar = 1;
2890 break;
2891 case dec_amg:
2892 if (off == subtr_amg)
2893 force_scalar = 1;
2894 break;
2895 /* in these cases, we're calling an assignment variant of an operator
2896 * (+= rather than +, for instance). regardless of whether it's a
2897 * fallback or not, it always has to return a value, which will be
2898 * assigned to the proper variable later */
2899 case add_amg:
2900 case subtr_amg:
2901 case mult_amg:
2902 case div_amg:
2903 case modulo_amg:
2904 case pow_amg:
2905 case lshift_amg:
2906 case rshift_amg:
2907 case repeat_amg:
2908 case concat_amg:
2909 case band_amg:
2910 case bor_amg:
2911 case bxor_amg:
2912 if (assign)
2913 force_scalar = 1;
2914 break;
2915 /* the copy constructor always needs to return a value */
2916 case copy_amg:
2917 force_scalar = 1;
2918 break;
2919 /* because of the way these are implemented (they don't perform the
2920 * dereferencing themselves, they return a reference that perl then
2921 * dereferences later), they always have to be in scalar context */
2922 case to_sv_amg:
2923 case to_av_amg:
2924 case to_hv_amg:
2925 case to_gv_amg:
2926 case to_cv_amg:
2927 force_scalar = 1;
2928 break;
2929 /* these don't have an op of their own; they're triggered by their parent
2930 * op, so the context there isn't meaningful ('$a and foo()' in void
2931 * context still needs to pass scalar context on to $a's bool overload) */
2932 case bool__amg:
2933 case numer_amg:
2934 case string_amg:
2935 force_scalar = 1;
2936 break;
2937 }
2938
497b47a8 2939#ifdef DEBUGGING
a0d0e21e 2940 if (!notfound) {
497b47a8 2941 DEBUG_o(Perl_deb(aTHX_
d66cca07 2942 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 2943 AMG_id2name(off),
2944 method+assignshift==off? "" :
a0288114 2945 " (initially \"",
497b47a8
JH		 2946 method+assignshift==off? "" :
2947 AMG_id2name(method+assignshift),
a0288114 2948 method+assignshift==off? "" : "\")",
497b47a8
JH		 2949 flags & AMGf_unary? "" :
2950 lr==1 ? " for right argument": " for left argument",
2951 flags & AMGf_unary? " for argument" : "",
d66cca07 2952 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 2953 fl? ",\n\tassignment variant used": "") );
ee239bfe 2954 }
497b47a8 2955#endif
748a9306
LW		 2956 /* Since we use shallow copy during assignment, we need
2957 * to dublicate the contents, probably calling user-supplied
2958 * version of copy operator
2959 */
ee239bfe
IZ		 2960 /* We need to copy in following cases:
2961 * a) Assignment form was called.
2962 * assignshift==1, assign==T, method + 1 == off
2963 * b) Increment or decrement, called directly.
2964 * assignshift==0, assign==0, method + 0 == off
2965 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 2966 * assignshift==0, assign==T,
ee239bfe
IZ		 2967 * force_cpy == T
2968 * d) Increment or decrement, translated to nomethod.
b267980d 2969 * assignshift==0, assign==0,
ee239bfe
IZ		 2970 * force_cpy == T
2971 * e) Assignment form translated to nomethod.
2972 * assignshift==1, assign==T, method + 1 != off
2973 * force_cpy == T
2974 */
2975 /* off is method, method+assignshift, or a result of opcode substitution.
2976 * In the latter case assignshift==0, so only notfound case is important.
2977 */
73512201 2978 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 2979 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 2980 || force_cpy) )
6f1401dc 2981 {
1b38c28e
NC		 2982 /* newSVsv does not behave as advertised, so we copy missing
2983 * information by hand */
2984 SV *tmpRef = SvRV(left);
2985 SV *rv_copy;
31d632c3 2986 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 2987 SvRV_set(left, rv_copy);
2988 SvSETMAGIC(left);
2989 SvREFCNT_dec(tmpRef);
2990 }
6f1401dc
DM		 2991 }
2992
a0d0e21e
LW		 2993 {
2994 dSP;
2995 BINOP myop;
2996 SV* res;
b7787f18 2997 const bool oldcatch = CATCH_GET;
67288365
JL		 2998 I32 oldmark, nret;
2999 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3000
54310121 3001 CATCH_SET(TRUE);
a0d0e21e
LW		 3002 Zero(&myop, 1, BINOP);
3003 myop.op_last = (OP *) &myop;
b37c2d43 3004 myop.op_next = NULL;
67288365
JL		 3005 myop.op_flags = OPf_STACKED;
3006
3007 switch (gimme) {
3008 case G_VOID:
3009 myop.op_flags |= OPf_WANT_VOID;
3010 break;
3011 case G_ARRAY:
3012 if (flags & AMGf_want_list) {
3013 myop.op_flags |= OPf_WANT_LIST;
3014 break;
3015 }
3016 /* FALLTHROUGH */
3017 default:
3018 myop.op_flags |= OPf_WANT_SCALAR;
3019 break;
3020 }
a0d0e21e 3021
e788e7d3 3022 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3023 ENTER;
462e5cf6 3024 SAVEOP();
533c011a 3025 PL_op = (OP *) &myop;
3280af22 3026 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3027 PL_op->op_private |= OPpENTERSUB_DB;
a0d0e21e 3028 PUTBACK;
897d3989 3029 Perl_pp_pushmark(aTHX);
a0d0e21e 3030
924508f0 3031 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3032 PUSHs(lr>0? right: left);
3033 PUSHs(lr>0? left: right);
3280af22 3034 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3035 if (notfound) {
59cd0e26
NC		 3036 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3037 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3038 }
ad64d0ec 3039 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3040 PUTBACK;
67288365 3041 oldmark = TOPMARK;
a0d0e21e 3042
139d0ce6 3043 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3044 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3045 LEAVE;
3046 SPAGAIN;
67288365
JL		 3047 nret = SP - (PL_stack_base + oldmark);
3048
3049 switch (gimme) {
3050 case G_VOID:
3051 /* returning NULL has another meaning, and we check the context
3052 * at the call site too, so this can be differentiated from the
3053 * scalar case */
3054 res = &PL_sv_undef;
3055 SP = PL_stack_base + oldmark;
3056 break;
3057 case G_ARRAY: {
3058 if (flags & AMGf_want_list) {
3059 res = sv_2mortal((SV *)newAV());
3060 av_extend((AV *)res, nret);
3061 while (nret--)
3062 av_store((AV *)res, nret, POPs);
3063 break;
3064 }
3065 /* FALLTHROUGH */
3066 }
3067 default:
3068 res = POPs;
3069 break;
3070 }
a0d0e21e 3071
ebafeae7 3072 PUTBACK;
d3acc0f7 3073 POPSTACK;
54310121 3074 CATCH_SET(oldcatch);
a0d0e21e 3075
a0d0e21e 3076 if (postpr) {
b7787f18 3077 int ans;
a0d0e21e
LW		 3078 switch (method) {
3079 case le_amg:
3080 case sle_amg:
3081 ans=SvIV(res)<=0; break;
3082 case lt_amg:
3083 case slt_amg:
3084 ans=SvIV(res)<0; break;
3085 case ge_amg:
3086 case sge_amg:
3087 ans=SvIV(res)>=0; break;
3088 case gt_amg:
3089 case sgt_amg:
3090 ans=SvIV(res)>0; break;
3091 case eq_amg:
3092 case seq_amg:
3093 ans=SvIV(res)==0; break;
3094 case ne_amg:
3095 case sne_amg:
3096 ans=SvIV(res)!=0; break;
3097 case inc_amg:
3098 case dec_amg:
bbce6d69 3099 SvSetSV(left,res); return left;
dc437b57 3100 case not_amg:
fe7ac86a 3101 ans=!SvTRUE(res); break;
b7787f18
AL		 3102 default:
3103 ans=0; break;
a0d0e21e 3104 }
54310121 3105 return boolSV(ans);
748a9306
LW		 3106 } else if (method==copy_amg) {
3107 if (!SvROK(res)) {
cea2e8a9 3108 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3109 }
3110 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3111 } else {
3112 return res;
3113 }
3114 }
3115}
c9d5ac95 3116
f5c1e807
NC		 3117void
3118Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3119{
3120 dVAR;
acda4c6a 3121 U32 hash;
f5c1e807 3122
7918f24d 3123 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3124
acda4c6a
NC		 3125 if (len > I32_MAX)
3126 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3127
ae8cc45f
NC		 3128 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3129 unshare_hek(GvNAME_HEK(gv));
3130 }
3131
acda4c6a 3132 PERL_HASH(hash, name, len);
c60dbbc3 3133 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3134}
3135
66610fdd 3136/*
f7461760
Z		 3137=for apidoc gv_try_downgrade
3138
2867cdbc
Z		 3139If the typeglob C<gv> can be expressed more succinctly, by having
3140something other than a real GV in its place in the stash, replace it
3141with the optimised form. Basic requirements for this are that C<gv>
3142is a real typeglob, is sufficiently ordinary, and is only referenced
3143from its package. This function is meant to be used when a GV has been
3144looked up in part to see what was there, causing upgrading, but based
3145on what was found it turns out that the real GV isn't required after all.
3146
3147If C<gv> is a completely empty typeglob, it is deleted from the stash.
3148
3149If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3150sub, the typeglob is replaced with a scalar-reference placeholder that
3151more compactly represents the same thing.
f7461760
Z		 3152
3153=cut
3154*/
3155
3156void
3157Perl_gv_try_downgrade(pTHX_ GV *gv)
3158{
3159 HV *stash;
3160 CV *cv;
3161 HEK *namehek;
3162 SV **gvp;
3163 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3164
3165 /* XXX Why and where does this leave dangling pointers during global
3166 destruction? */
627364f1 3167 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3168
2867cdbc 3169 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3170 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3171 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3172 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3173 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3174 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3175 return;
803f2748
DM		 3176 if (SvMAGICAL(gv)) {
3177 MAGIC *mg;
3178 /* only backref magic is allowed */
3179 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3180 return;
3181 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3182 if (mg->mg_type != PERL_MAGIC_backref)
3183 return;
3184 }
3185 }
2867cdbc
Z		 3186 cv = GvCV(gv);
3187 if (!cv) {
3188 HEK *gvnhek = GvNAME_HEK(gv);
3189 (void)hv_delete(stash, HEK_KEY(gvnhek),
3190 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
3191 } else if (GvMULTI(gv) && cv &&
f7461760
Z		 3192 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3193 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3194 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3195 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3196 (namehek = GvNAME_HEK(gv)) &&
3197 (gvp = hv_fetch(stash, HEK_KEY(namehek),
3198 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
3199 *gvp == (SV*)gv) {
3200 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
3201 SvREFCNT(gv) = 0;
3202 sv_clear((SV*)gv);
3203 SvREFCNT(gv) = 1;
3204 SvFLAGS(gv) = SVt_IV|SVf_ROK;
3205 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3206 STRUCT_OFFSET(XPVIV, xiv_iv));
3207 SvRV_set(gv, value);
3208 }
3209}
3210
4aaa4757
FC		 3211#include "XSUB.h"
3212
3213static void
3214core_xsub(pTHX_ CV* cv)
3215{
3216 Perl_croak(aTHX_
3217 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3218 );
3219}
3220
f7461760 3221/*
66610fdd
RGS		 3222 * Local variables:
3223 * c-indentation-style: bsd
3224 * c-basic-offset: 4
14d04a33 3225 * indent-tabs-mode: nil
66610fdd
RGS		 3226 * End:
3227 *
14d04a33 3228 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3229 */
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