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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 84 if (!*where)
e17aed30 85 {
d5713896 86 *where = newSV_type(type);
e17aed30
FC
87 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
88 && strnEQ(GvNAME(gv), "ISA", 3))
89 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
90 }
79072805
LW
91 return gv;
92}
93
94GV *
864dbfa3 95Perl_gv_fetchfile(pTHX_ const char *name)
79072805 96{
7918f24d 97 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC
98 return gv_fetchfile_flags(name, strlen(name), 0);
99}
100
101GV *
102Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
103 const U32 flags)
104{
97aff369 105 dVAR;
4116122e 106 char smallbuf[128];
53d95988 107 char *tmpbuf;
d9095cec 108 const STRLEN tmplen = namelen + 2;
79072805
LW
109 GV *gv;
110
7918f24d 111 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC
112 PERL_UNUSED_ARG(flags);
113
1d7c1841 114 if (!PL_defstash)
a0714e2c 115 return NULL;
1d7c1841 116
d9095cec 117 if (tmplen <= sizeof smallbuf)
53d95988
CS
118 tmpbuf = smallbuf;
119 else
798b63bc 120 Newx(tmpbuf, tmplen, char);
0ac0412a 121 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS
122 tmpbuf[0] = '_';
123 tmpbuf[1] = '<';
d9095cec
NC
124 memcpy(tmpbuf + 2, name, namelen);
125 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 126 if (!isGV(gv)) {
d9095cec 127 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 128#ifdef PERL_DONT_CREATE_GVSV
d9095cec 129 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 130#else
d9095cec 131 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 132#endif
1d7c1841 133 }
5a9a79a4
FC
134 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
135 hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile);
53d95988
CS
136 if (tmpbuf != smallbuf)
137 Safefree(tmpbuf);
79072805
LW
138 return gv;
139}
140
62d55b22
NC
141/*
142=for apidoc gv_const_sv
143
144If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
145inlining, or C<gv> is a placeholder reference that would be promoted to such
146a typeglob, then returns the value returned by the sub. Otherwise, returns
147NULL.
148
149=cut
150*/
151
152SV *
153Perl_gv_const_sv(pTHX_ GV *gv)
154{
7918f24d
NC
155 PERL_ARGS_ASSERT_GV_CONST_SV;
156
62d55b22
NC
157 if (SvTYPE(gv) == SVt_PVGV)
158 return cv_const_sv(GvCVu(gv));
6f1b3ab0 159 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC
160}
161
12816592
NC
162GP *
163Perl_newGP(pTHX_ GV *const gv)
164{
165 GP *gp;
19bad673 166 U32 hash;
19bad673
NC
167 const char *file;
168 STRLEN len;
2639089b 169#ifndef USE_ITHREADS
6b352265 170 GV *filegv;
2639089b 171#endif
c2587955 172 dVAR;
19bad673 173
7918f24d 174 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD
175 Newxz(gp, 1, GP);
176 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
177#ifndef PERL_DONT_CREATE_GVSV
178 gp->gp_sv = newSV(0);
179#endif
7918f24d 180
c947bc1d
FC
181 /* PL_curcop may be null here. E.g.,
182 INIT { bless {} and exit }
183 frees INIT before looking up DESTROY (and creating *DESTROY)
184 */
2639089b
DD
185 if (PL_curcop) {
186 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 187#ifdef USE_ITHREADS
2639089b
DD
188 if (CopFILE(PL_curcop)) {
189 file = CopFILE(PL_curcop);
190 len = strlen(file);
191 }
2639089b 192#else
cb0d3385
FC
193 filegv = CopFILEGV(PL_curcop);
194 if (filegv) {
195 file = GvNAME(filegv)+2;
196 len = GvNAMELEN(filegv)-2;
197 }
6e314d4f 198#endif
cb0d3385
FC
199 else goto no_file;
200 }
201 else {
202 no_file:
19bad673
NC
203 file = "";
204 len = 0;
205 }
f4890806
NC
206
207 PERL_HASH(hash, file, len);
f4890806 208 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC
209 gp->gp_refcnt = 1;
210
211 return gp;
212}
213
803f2748
DM
214/* Assign CvGV(cv) = gv, handling weak references.
215 * See also S_anonymise_cv_maybe */
216
217void
218Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
219{
220 GV * const oldgv = CvGV(cv);
b290562e 221 HEK *hek;
803f2748
DM
222 PERL_ARGS_ASSERT_CVGV_SET;
223
224 if (oldgv == gv)
225 return;
226
227 if (oldgv) {
cfc1e951 228 if (CvCVGV_RC(cv)) {
e7881358 229 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM
230 CvCVGV_RC_off(cv);
231 }
803f2748 232 else {
803f2748
DM
233 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
234 }
235 }
b290562e 236 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
803f2748 237
b290562e 238 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 239 assert(!CvCVGV_RC(cv));
803f2748
DM
240
241 if (!gv)
242 return;
243
c794ca97
DM
244 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
245 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
246 else {
cfc1e951 247 CvCVGV_RC_on(cv);
803f2748
DM
248 SvREFCNT_inc_simple_void_NN(gv);
249 }
803f2748
DM
250}
251
c68d9564
Z
252/* Assign CvSTASH(cv) = st, handling weak references. */
253
254void
255Perl_cvstash_set(pTHX_ CV *cv, HV *st)
256{
257 HV *oldst = CvSTASH(cv);
258 PERL_ARGS_ASSERT_CVSTASH_SET;
259 if (oldst == st)
260 return;
261 if (oldst)
262 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
263 SvANY(cv)->xcv_stash = st;
264 if (st)
265 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
266}
803f2748 267
e1104062
FC
268/*
269=for apidoc gv_init_pvn
270
271Converts a scalar into a typeglob. This is an incoercible typeglob;
272assigning a reference to it will assign to one of its slots, instead of
273overwriting it as happens with typeglobs created by SvSetSV. Converting
274any scalar that is SvOK() may produce unpredictable results and is reserved
275for perl's internal use.
276
277C<gv> is the scalar to be converted.
278
279C<stash> is the parent stash/package, if any.
280
04ec7e59
FC
281C<name> and C<len> give the name. The name must be unqualified;
282that is, it must not include the package name. If C<gv> is a
e1104062
FC
283stash element, it is the caller's responsibility to ensure that the name
284passed to this function matches the name of the element. If it does not
285match, perl's internal bookkeeping will get out of sync.
286
04ec7e59
FC
287C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
288the return value of SvUTF8(sv). It can also take the
289GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC
290seen before (i.e., suppress "Used once" warnings).
291
292=for apidoc gv_init
293
294The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC
295has no flags parameter. If the C<multi> parameter is set, the
296GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC
297
298=for apidoc gv_init_pv
299
300Same as gv_init_pvn(), but takes a nul-terminated string for the name
301instead of separate char * and length parameters.
302
303=for apidoc gv_init_sv
304
305Same as gv_init_pvn(), but takes an SV * for the name instead of separate
306char * and length parameters. C<flags> is currently unused.
307
308=cut
309*/
310
463ee0b2 311void
04ec7e59 312Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF
313{
314 char *namepv;
315 STRLEN namelen;
316 PERL_ARGS_ASSERT_GV_INIT_SV;
317 namepv = SvPV(namesv, namelen);
318 if (SvUTF8(namesv))
319 flags |= SVf_UTF8;
04ec7e59 320 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF
321}
322
323void
04ec7e59 324Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF
325{
326 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 327 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF
328}
329
330void
04ec7e59 331Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 332{
27da23d5 333 dVAR;
3b6733bf
NC
334 const U32 old_type = SvTYPE(gv);
335 const bool doproto = old_type > SVt_NULL;
f9509170 336 char * const proto = (doproto && SvPOK(gv))
dad95a0a 337 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 338 : NULL;
49a54bbe 339 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 340 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 341 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 342 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 343
e6066781 344 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC
345 assert (!(proto && has_constant));
346
347 if (has_constant) {
5c1f4d79
NC
348 /* The constant has to be a simple scalar type. */
349 switch (SvTYPE(has_constant)) {
5c1f4d79
NC
350 case SVt_PVHV:
351 case SVt_PVCV:
352 case SVt_PVFM:
353 case SVt_PVIO:
354 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
355 sv_reftype(has_constant, 0));
42d0e0b7 356 default: NOOP;
5c1f4d79 357 }
756cb477
NC
358 SvRV_set(gv, NULL);
359 SvROK_off(gv);
360 }
463ee0b2 361
3b6733bf
NC
362
363 if (old_type < SVt_PVGV) {
364 if (old_type >= SVt_PV)
365 SvCUR_set(gv, 0);
ad64d0ec 366 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 367 }
55d729e4
GS
368 if (SvLEN(gv)) {
369 if (proto) {
f880fe2f 370 SvPV_set(gv, NULL);
b162af07 371 SvLEN_set(gv, 0);
55d729e4
GS
372 SvPOK_off(gv);
373 } else
94010e71 374 Safefree(SvPVX_mutable(gv));
55d729e4 375 }
2e5b91de
NC
376 SvIOK_off(gv);
377 isGV_with_GP_on(gv);
12816592 378
c43ae56f 379 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC
380 GvSTASH(gv) = stash;
381 if (stash)
ad64d0ec 382 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 383 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC
384 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
385 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 386 if (doproto) {
e3d2b9e7 387 CV *cv;
756cb477
NC
388 if (has_constant) {
389 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 390 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC
391 /* In case op.c:S_process_special_blocks stole it: */
392 if (!GvCV(gv))
c43ae56f 393 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 394 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC
395 /* If this reference was a copy of another, then the subroutine
396 must have been "imported", by a Perl space assignment to a GV
397 from a reference to CV. */
398 if (exported_constant)
399 GvIMPORTED_CV_on(gv);
186a5ba8 400 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 401 } else {
186a5ba8 402 cv = newSTUB(gv,1);
756cb477 403 }
55d729e4 404 if (proto) {
e3d2b9e7 405 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 406 SV_HAS_TRAILING_NUL);
e0260a5b 407 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS
408 }
409 }
463ee0b2
LW
410}
411
76e3520e 412STATIC void
e6066781 413S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 414{
e6066781 415 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 416
a0d0e21e
LW
417 switch (sv_type) {
418 case SVt_PVIO:
419 (void)GvIOn(gv);
420 break;
421 case SVt_PVAV:
422 (void)GvAVn(gv);
423 break;
424 case SVt_PVHV:
425 (void)GvHVn(gv);
426 break;
c69033f2
NC
427#ifdef PERL_DONT_CREATE_GVSV
428 case SVt_NULL:
429 case SVt_PVCV:
430 case SVt_PVFM:
e654831b 431 case SVt_PVGV:
c69033f2
NC
432 break;
433 default:
dbdce04c
NC
434 if(GvSVn(gv)) {
435 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
436 If we just cast GvSVn(gv) to void, it ignores evaluating it for
437 its side effect */
438 }
c69033f2 439#endif
a0d0e21e
LW
440 }
441}
442
0f8d4b5e
FC
443static void core_xsub(pTHX_ CV* cv);
444
445static GV *
446S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 447 const char * const name, const STRLEN len)
0f8d4b5e
FC
448{
449 const int code = keyword(name, len, 1);
450 static const char file[] = __FILE__;
97021f77 451 CV *cv, *oldcompcv = NULL;
0f8d4b5e 452 int opnum = 0;
0f8d4b5e 453 bool ampable = TRUE; /* &{}-able */
97021f77
FC
454 COP *oldcurcop = NULL;
455 yy_parser *oldparser = NULL;
456 I32 oldsavestack_ix = 0;
0f8d4b5e
FC
457
458 assert(gv || stash);
459 assert(name);
0f8d4b5e 460
88b892d8
FC
461 if (!code) return NULL; /* Not a keyword */
462 switch (code < 0 ? -code : code) {
0f8d4b5e 463 /* no support for \&CORE::infix;
d885f758 464 no support for funcs that do not parse like funcs */
88b892d8
FC
465 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
466 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp: case KEY_CORE :
eb31eb35 467 case KEY_default : case KEY_DESTROY:
88b892d8 468 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 469 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 470 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 471 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC
472 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
473 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
474 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 475 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 476 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 477 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 478 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 479 case KEY_state: case KEY_sub :
46bef06f 480 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC
481 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
482 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC
483 return NULL;
484 case KEY_chdir:
eb31eb35 485 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 486 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC
487 case KEY_keys:
488 case KEY_lstat:
489 case KEY_pop:
490 case KEY_push:
491 case KEY_shift:
a99f2ca2 492 case KEY_splice: case KEY_split:
0f8d4b5e
FC
493 case KEY_stat:
494 case KEY_system:
495 case KEY_truncate: case KEY_unlink:
496 case KEY_unshift:
497 case KEY_values:
498 ampable = FALSE;
499 }
500 if (!gv) {
501 gv = (GV *)newSV(0);
502 gv_init(gv, stash, name, len, TRUE);
503 }
7e68c38b 504 GvMULTI_on(gv);
0f8d4b5e
FC
505 if (ampable) {
506 ENTER;
507 oldcurcop = PL_curcop;
508 oldparser = PL_parser;
509 lex_start(NULL, NULL, 0);
510 oldcompcv = PL_compcv;
511 PL_compcv = NULL; /* Prevent start_subparse from setting
512 CvOUTSIDE. */
513 oldsavestack_ix = start_subparse(FALSE,0);
514 cv = PL_compcv;
515 }
516 else {
517 /* Avoid calling newXS, as it calls us, and things start to
518 get hairy. */
519 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
520 GvCV_set(gv,cv);
521 GvCVGEN(gv) = 0;
522 mro_method_changed_in(GvSTASH(gv));
523 CvISXSUB_on(cv);
524 CvXSUB(cv) = core_xsub;
525 }
526 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
527 from PL_curcop. */
528 (void)gv_fetchfile(file);
529 CvFILE(cv) = (char *)file;
530 /* XXX This is inefficient, as doing things this order causes
531 a prototype check in newATTRSUB. But we have to do
532 it this order as we need an op number before calling
533 new ATTRSUB. */
534 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 535 if (stash)
73c02f15 536 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 537 if (ampable) {
4428fb0e
TC
538#ifdef DEBUGGING
539 CV *orig_cv = cv;
540#endif
0f8d4b5e 541 CvLVALUE_on(cv);
4428fb0e
TC
542 /* newATTRSUB will free the CV and return NULL if we're still
543 compiling after a syntax error */
544 if ((cv = newATTRSUB_flags(
7e68c38b 545 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC
546 NULL,NULL,
547 coresub_op(
548 opnum
549 ? newSVuv((UV)opnum)
550 : newSVpvn(name,len),
551 code, opnum
7e68c38b
FC
552 ),
553 1
4428fb0e
TC
554 )) != NULL) {
555 assert(GvCV(gv) == orig_cv);
556 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
557 && opnum != OP_UNDEF)
558 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
559 }
0f8d4b5e
FC
560 LEAVE;
561 PL_parser = oldparser;
562 PL_curcop = oldcurcop;
563 PL_compcv = oldcompcv;
564 }
4428fb0e
TC
565 if (cv) {
566 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
567 cv_set_call_checker(
568 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
569 );
570 SvREFCNT_dec(opnumsv);
571 }
572
0f8d4b5e
FC
573 return gv;
574}
575
954c1994 576/*
6c53d59b
FC
577=for apidoc gv_fetchmeth
578
579Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
580
e6919483
BF
581=for apidoc gv_fetchmeth_sv
582
583Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
584of an SV instead of a string/length pair.
585
586=cut
587*/
588
589GV *
590Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
591{
592 char *namepv;
593 STRLEN namelen;
594 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
595 namepv = SvPV(namesv, namelen);
596 if (SvUTF8(namesv))
597 flags |= SVf_UTF8;
598 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
599}
600
601/*
602=for apidoc gv_fetchmeth_pv
603
604Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
605instead of a string/length pair.
606
607=cut
608*/
609
610GV *
611Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
612{
613 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
614 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
615}
616
617/*
618=for apidoc gv_fetchmeth_pvn
954c1994
GS
619
620Returns the glob with the given C<name> and a defined subroutine or
621C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 622accessible via @ISA and UNIVERSAL::.
954c1994
GS
623
624The argument C<level> should be either 0 or -1. If C<level==0>, as a
625side-effect creates a glob with the given C<name> in the given C<stash>
626which in the case of success contains an alias for the subroutine, and sets
e1a479c5 627up caching info for this glob.
954c1994 628
aae43805
FC
629The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
630
631GV_SUPER indicates that we want to look up the method in the superclasses
632of the C<stash>.
e6919483 633
aae43805 634The
954c1994 635GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 636visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 637the GV directly; instead, you should use the method's CV, which can be
b267980d 638obtained from the GV with the C<GvCV> macro.
954c1994
GS
639
640=cut
641*/
642
e1a479c5
BB
643/* NOTE: No support for tied ISA */
644
79072805 645GV *
e6919483 646Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 647{
97aff369 648 dVAR;
463ee0b2 649 GV** gvp;
e1a479c5
BB
650 AV* linear_av;
651 SV** linear_svp;
652 SV* linear_sv;
aae43805 653 HV* cstash, *cachestash;
e1a479c5
BB
654 GV* candidate = NULL;
655 CV* cand_cv = NULL;
e1a479c5 656 GV* topgv = NULL;
bfcb3514 657 const char *hvname;
e1a479c5
BB
658 I32 create = (level >= 0) ? 1 : 0;
659 I32 items;
e1a479c5 660 U32 topgen_cmp;
04f3bf56 661 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 662
e6919483 663 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 664
af09ea45
IK
665 /* UNIVERSAL methods should be callable without a stash */
666 if (!stash) {
e1a479c5 667 create = 0; /* probably appropriate */
da51bb9b 668 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK
669 return 0;
670 }
671
e1a479c5
BB
672 assert(stash);
673
bfcb3514
NC
674 hvname = HvNAME_get(stash);
675 if (!hvname)
e1a479c5 676 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 677
e1a479c5
BB
678 assert(hvname);
679 assert(name);
463ee0b2 680
aae43805
FC
681 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
682 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 683
dd69841b 684 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 685
aae43805 686 if (flags & GV_SUPER) {
1a33a059
FC
687 if (!HvAUX(stash)->xhv_mro_meta->super)
688 HvAUX(stash)->xhv_mro_meta->super = newHV();
689 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC
690 }
691 else cachestash = stash;
692
e1a479c5 693 /* check locally for a real method or a cache entry */
aae43805
FC
694 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
695 create);
e1a479c5
BB
696 if(gvp) {
697 topgv = *gvp;
0f8d4b5e 698 have_gv:
e1a479c5
BB
699 assert(topgv);
700 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 701 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
702 if ((cand_cv = GvCV(topgv))) {
703 /* If genuine method or valid cache entry, use it */
704 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
705 return topgv;
706 }
707 else {
708 /* stale cache entry, junk it and move on */
e7881358 709 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM
710 GvCV_set(topgv, NULL);
711 cand_cv = NULL;
e1a479c5
BB
712 GvCVGEN(topgv) = 0;
713 }
714 }
715 else if (GvCVGEN(topgv) == topgen_cmp) {
716 /* cache indicates no such method definitively */
717 return 0;
718 }
aae43805
FC
719 else if (stash == cachestash
720 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 721 && strnEQ(hvname, "CORE", 4)
87566176 722 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 723 goto have_gv;
463ee0b2 724 }
79072805 725
aae43805 726 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB
727 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
728 items = AvFILLp(linear_av); /* no +1, to skip over self */
729 while (items--) {
730 linear_sv = *linear_svp++;
731 assert(linear_sv);
732 cstash = gv_stashsv(linear_sv, 0);
733
dd69841b 734 if (!cstash) {
ecad31f0 735 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 736 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 737 SVfARG(linear_sv),
d0c0e7dd 738 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB
739 continue;
740 }
9607fc9c 741
e1a479c5
BB
742 assert(cstash);
743
c60dbbc3 744 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC
745 if (!gvp) {
746 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
747 const char *hvname = HvNAME(cstash); assert(hvname);
748 if (strnEQ(hvname, "CORE", 4)
749 && (candidate =
87566176 750 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC
751 ))
752 goto have_candidate;
753 }
754 continue;
755 }
756 else candidate = *gvp;
757 have_candidate:
e1a479c5 758 assert(candidate);
04f3bf56 759 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 760 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB
761 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
762 /*
763 * Found real method, cache method in topgv if:
764 * 1. topgv has no synonyms (else inheritance crosses wires)
765 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
766 */
767 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
768 CV *old_cv = GvCV(topgv);
769 SvREFCNT_dec(old_cv);
e1a479c5 770 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 771 GvCV_set(topgv, cand_cv);
e1a479c5
BB
772 GvCVGEN(topgv) = topgen_cmp;
773 }
774 return candidate;
775 }
776 }
9607fc9c 777
e1a479c5
BB
778 /* Check UNIVERSAL without caching */
779 if(level == 0 || level == -1) {
aae43805 780 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB
781 if(candidate) {
782 cand_cv = GvCV(candidate);
783 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP
784 CV *old_cv = GvCV(topgv);
785 SvREFCNT_dec(old_cv);
e1a479c5 786 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 787 GvCV_set(topgv, cand_cv);
e1a479c5
BB
788 GvCVGEN(topgv) = topgen_cmp;
789 }
790 return candidate;
791 }
792 }
793
794 if (topgv && GvREFCNT(topgv) == 1) {
795 /* cache the fact that the method is not defined */
796 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW
797 }
798
79072805
LW
799 return 0;
800}
801
954c1994 802/*
460e5730
FC
803=for apidoc gv_fetchmeth_autoload
804
805This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
806parameter.
807
d21989ed 808=for apidoc gv_fetchmeth_sv_autoload
611c1e95 809
d21989ed
BF
810Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
811of an SV instead of a string/length pair.
812
813=cut
814*/
815
816GV *
817Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
818{
819 char *namepv;
820 STRLEN namelen;
821 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
822 namepv = SvPV(namesv, namelen);
823 if (SvUTF8(namesv))
824 flags |= SVf_UTF8;
825 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
826}
827
828/*
829=for apidoc gv_fetchmeth_pv_autoload
830
831Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
832instead of a string/length pair.
833
834=cut
835*/
836
837GV *
838Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
839{
840 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
841 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
842}
843
844/*
845=for apidoc gv_fetchmeth_pvn_autoload
846
847Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ
848Returns a glob for the subroutine.
849
850For an autoloaded subroutine without a GV, will create a GV even
851if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
852of the result may be zero.
853
d21989ed
BF
854Currently, the only significant value for C<flags> is SVf_UTF8.
855
611c1e95
IZ
856=cut
857*/
858
859GV *
d21989ed 860Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 861{
499321d3 862 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 863
d21989ed 864 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 865
611c1e95 866 if (!gv) {
611c1e95
IZ
867 CV *cv;
868 GV **gvp;
869
870 if (!stash)
6136c704 871 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 872 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 873 return NULL;
d21989ed 874 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 875 return NULL;
611c1e95
IZ
876 cv = GvCV(gv);
877 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 878 return NULL;
611c1e95
IZ
879 /* Have an autoload */
880 if (level < 0) /* Cannot do without a stub */
d21989ed 881 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF
882 gvp = (GV**)hv_fetch(stash, name,
883 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 884 if (!gvp)
6136c704 885 return NULL;
611c1e95
IZ
886 return *gvp;
887 }
888 return gv;
889}
890
891/*
954c1994
GS
892=for apidoc gv_fetchmethod_autoload
893
894Returns the glob which contains the subroutine to call to invoke the method
895on the C<stash>. In fact in the presence of autoloading this may be the
896glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 897already setup.
954c1994
GS
898
899The third parameter of C<gv_fetchmethod_autoload> determines whether
900AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 901means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 902Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 903with a non-zero C<autoload> parameter.
954c1994
GS
904
905These functions grant C<"SUPER"> token as a prefix of the method name. Note
906that if you want to keep the returned glob for a long time, you need to
907check for it being "AUTOLOAD", since at the later time the call may load a
908different subroutine due to $AUTOLOAD changing its value. Use the glob
b267980d 909created via a side effect to do this.
954c1994
GS
910
911These functions have the same side-effects and as C<gv_fetchmeth> with
912C<level==0>. C<name> should be writable if contains C<':'> or C<'
913''>. The warning against passing the GV returned by C<gv_fetchmeth> to
b267980d 914C<call_sv> apply equally to these functions.
954c1994
GS
915
916=cut
917*/
918
dc848c6f 919GV *
864dbfa3 920Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 921{
547bb267
NC
922 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
923
256d1bb2
NC
924 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
925}
926
44130a26
BF
927GV *
928Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
929{
930 char *namepv;
931 STRLEN namelen;
932 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
933 namepv = SvPV(namesv, namelen);
934 if (SvUTF8(namesv))
935 flags |= SVf_UTF8;
936 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
937}
938
939GV *
940Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
941{
942 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
943 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
944}
945
256d1bb2
NC
946/* Don't merge this yet, as it's likely to get a len parameter, and possibly
947 even a U32 hash */
948GV *
44130a26 949Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 950{
97aff369 951 dVAR;
eb578fdb 952 const char *nend;
c445ea15 953 const char *nsplit = NULL;
a0d0e21e 954 GV* gv;
0dae17bd 955 HV* ostash = stash;
c94593d0 956 const char * const origname = name;
ad64d0ec 957 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC
958 const U32 autoload = flags & GV_AUTOLOAD;
959 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 960 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 961
44130a26 962 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 963
eff494dd 964 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 965 stash = NULL;
c9bf4021
NC
966 else {
967 /* The only way stash can become NULL later on is if nsplit is set,
968 which in turn means that there is no need for a SVt_PVHV case
969 the error reporting code. */
970 }
b267980d 971
44130a26 972 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 973 if (*nend == '\'') {
a0d0e21e 974 nsplit = nend;
c94593d0
NC
975 name = nend + 1;
976 }
977 else if (*nend == ':' && *(nend + 1) == ':') {
978 nsplit = nend++;
979 name = nend + 1;
980 }
a0d0e21e
LW
981 }
982 if (nsplit) {
7edbdc6b 983 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 984 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC
985 stash = CopSTASH(PL_curcop);
986 flags |= GV_SUPER;
cea2e8a9 987 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 988 origname, HvENAME_get(stash), name) );
4633a7c4 989 }
aae43805
FC
990 else if ((nsplit - origname) >= 7 &&
991 strnEQ(nsplit - 7, "::SUPER", 7)) {
992 /* don't autovifify if ->NoSuchStash::SUPER::method */
993 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
994 if (stash) flags |= GV_SUPER;
995 }
e189a56d 996 else {
af09ea45 997 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 998 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 999 }
0dae17bd 1000 ostash = stash;
4633a7c4
LW
1001 }
1002
14d1dfbd 1003 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1004 if (!gv) {
2f6e0fe7 1005 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1006 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1007 else if (autoload)
c8416c26
BF
1008 gv = gv_autoload_pvn(
1009 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1010 );
256d1bb2
NC
1011 if (!gv && do_croak) {
1012 /* Right now this is exclusively for the benefit of S_method_common
1013 in pp_hot.c */
1014 if (stash) {
15e6cdd9
DG
1015 /* If we can't find an IO::File method, it might be a call on
1016 * a filehandle. If IO:File has not been loaded, try to
1017 * require it first instead of croaking */
1018 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR
1019 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1020 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1021 STR_WITH_LEN("IO/File.pm"), 0,
1022 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1023 ) {
31b05a0f 1024 require_pv("IO/File.pm");
14d1dfbd 1025 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG
1026 if (gv)
1027 return gv;
1028 }
256d1bb2 1029 Perl_croak(aTHX_
b17a0679 1030 "Can't locate object method \"%"UTF8f
d0c0e7dd 1031 "\" via package \"%"HEKf"\"",
b17a0679 1032 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1033 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC
1034 }
1035 else {
ecad31f0 1036 SV* packnamesv;
256d1bb2 1037
256d1bb2 1038 if (nsplit) {
ecad31f0
BF
1039 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1040 SVs_TEMP | is_utf8);
256d1bb2 1041 } else {
017c5e4e 1042 packnamesv = error_report;
256d1bb2
NC
1043 }
1044
1045 Perl_croak(aTHX_
b17a0679
FC
1046 "Can't locate object method \"%"UTF8f
1047 "\" via package \"%"SVf"\""
ecad31f0 1048 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1049 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1050 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC
1051 }
1052 }
463ee0b2 1053 }
dc848c6f 1054 else if (autoload) {
9d4ba2ae 1055 CV* const cv = GvCV(gv);
09280a33
CS
1056 if (!CvROOT(cv) && !CvXSUB(cv)) {
1057 GV* stubgv;
1058 GV* autogv;
1059
1060 if (CvANON(cv))
1061 stubgv = gv;
1062 else {
1063 stubgv = CvGV(cv);
1064 if (GvCV(stubgv) != cv) /* orphaned import */
1065 stubgv = gv;
1066 }
c8416c26
BF
1067 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1068 GvNAME(stubgv), GvNAMELEN(stubgv),
1069 GV_AUTOLOAD_ISMETHOD
1070 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f
PP
1071 if (autogv)
1072 gv = autogv;
1073 }
1074 }
44a8e56a
PP
1075
1076 return gv;
1077}
1078
1079GV*
0eeb01b9 1080Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF
1081{
1082 char *namepv;
1083 STRLEN namelen;
0fe84f7c 1084 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF
1085 namepv = SvPV(namesv, namelen);
1086 if (SvUTF8(namesv))
1087 flags |= SVf_UTF8;
0eeb01b9 1088 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF
1089}
1090
1091GV*
0eeb01b9 1092Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1093{
0fe84f7c 1094 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1095 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF
1096}
1097
1098GV*
0eeb01b9 1099Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1100{
27da23d5 1101 dVAR;
44a8e56a
PP
1102 GV* gv;
1103 CV* cv;
1104 HV* varstash;
1105 GV* vargv;
1106 SV* varsv;
c8416c26
BF
1107 SV *packname = NULL;
1108 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1109
0fe84f7c 1110 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1111
7edbdc6b 1112 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1113 return NULL;
0dae17bd
GS
1114 if (stash) {
1115 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF
1116 STRLEN packname_len = 0;
1117 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1118 packname = newSVpvn_flags(packname_ptr, packname_len,
1119 SVs_TEMP | SvUTF8(stash));
5c284bb0 1120 stash = NULL;
0dae17bd 1121 }
c8416c26
BF
1122 else
1123 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1124 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1125 }
c8416c26 1126 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
a0714e2c 1127 return NULL;
dc848c6f
PP
1128 cv = GvCV(gv);
1129
adb5a9ae 1130 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1131 return NULL;
ed850460 1132
dc848c6f
PP
1133 /*
1134 * Inheriting AUTOLOAD for non-methods works ... for now.
1135 */
0eeb01b9
FC
1136 if (
1137 !(flags & GV_AUTOLOAD_ISMETHOD)
1138 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1139 )
d1d15184 1140 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC
1141 "Use of inherited AUTOLOAD for non-method %"SVf
1142 "::%"UTF8f"() is deprecated",
ecad31f0 1143 SVfARG(packname),
b17a0679 1144 UTF8fARG(is_utf8, len, name));
44a8e56a 1145
aed2304a 1146 if (CvISXSUB(cv)) {
bb619f37
FC
1147 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1148 * and split that value on the last '::', pass along the same data
1149 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC
1150 *
1151 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1152 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC
1153 * type. Since SvPVX has been documented as returning the sub name
1154 * for a long time, but not as returning the prototype, we have
1155 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1156 * elsewhere.
1157 *
1158 * We put the prototype in the same allocated buffer, but after
1159 * the sub name. The SvPOK flag indicates the presence of a proto-
1160 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1161 * If both flags are on, then SvLEN is used to indicate the end of
1162 * the prototype (artificially lower than what is actually allo-
1163 * cated), at the risk of having to reallocate a few bytes unneces-
1164 * sarily--but that should happen very rarely, if ever.
1165 *
1166 * We use SvUTF8 for both prototypes and sub names, so if one is
1167 * UTF8, the other must be upgraded.
adb5a9ae 1168 */
c68d9564 1169 CvSTASH_set(cv, stash);
8fa6a409 1170 if (SvPOK(cv)) { /* Ouch! */
e7881358 1171 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC
1172 STRLEN ulen;
1173 const char *proto = CvPROTO(cv);
1174 assert(proto);
1175 if (SvUTF8(cv))
1176 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1177 ulen = SvCUR(tmpsv);
1178 SvCUR(tmpsv)++; /* include null in string */
1179 sv_catpvn_flags(
1180 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1181 );
1182 SvTEMP_on(tmpsv); /* Allow theft */
1183 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1184 SvTEMP_off(tmpsv);
e7881358 1185 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC
1186 SvLEN(cv) = SvCUR(cv) + 1;
1187 SvCUR(cv) = ulen;
1188 }
1189 else {
1190 sv_setpvn((SV *)cv, name, len);
1191 SvPOK_off(cv);
1192 if (is_utf8)
c8416c26 1193 SvUTF8_on(cv);
8fa6a409
FC
1194 else SvUTF8_off(cv);
1195 }
1196 CvAUTOLOAD_on(cv);
adb5a9ae 1197 }
adb5a9ae 1198
44a8e56a
PP
1199 /*
1200 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1201 * The subroutine's original name may not be "AUTOLOAD", so we don't
1202 * use that, but for lack of anything better we will use the sub's
1203 * original package to look up $AUTOLOAD.
1204 */
1205 varstash = GvSTASH(CvGV(cv));
5c7983e5 1206 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS
1207 ENTER;
1208
c69033f2 1209 if (!isGV(vargv)) {
04ec7e59 1210 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1211#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1212 GvSV(vargv) = newSV(0);
c69033f2
NC
1213#endif
1214 }
3d35f11b 1215 LEAVE;
e203899d 1216 varsv = GvSVn(vargv);
4bac9ae4
CS
1217 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1218 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1219 sv_setsv(varsv, packname);
396482e1 1220 sv_catpvs(varsv, "::");
d40bf27b
NC
1221 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1222 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC
1223 sv_catpvn_flags(
1224 varsv, name, len,
5bcd1ef4 1225 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1226 );
c8416c26
BF
1227 if (is_utf8)
1228 SvUTF8_on(varsv);
a0d0e21e
LW
1229 return gv;
1230}
1231
44a2ac75
YO
1232
1233/* require_tie_mod() internal routine for requiring a module
486ec47a 1234 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO
1235 *
1236 * The "gv" parameter should be the glob.
45cbc99a
RGS
1237 * "varpv" holds the name of the var, used for error messages.
1238 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1239 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS
1240 * are working reasonably close to as expected.
1241 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO
1242 * For the protection of $! to work (it is set by this routine)
1243 * the sv slot must already be magicalized.
d2c93421 1244 */
44a2ac75
YO
1245STATIC HV*
1246S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1247{
27da23d5 1248 dVAR;
da51bb9b 1249 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1250
7918f24d
NC
1251 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1252
0ea03996 1253 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS
1254 SV *module = newSVsv(namesv);
1255 char varname = *varpv; /* varpv might be clobbered by load_module,
1256 so save it. For the moment it's always
1257 a single char. */
b82b06b8 1258 const char type = varname == '[' ? '$' : '%';
d2c93421 1259 dSP;
d2c93421 1260 ENTER;
600beb2e 1261 SAVEFREESV(namesv);
44a2ac75 1262 if ( flags & 1 )
45cbc99a 1263 save_scalar(gv);
cac54379 1264 PUSHSTACKi(PERLSI_MAGIC);
45cbc99a 1265 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
cac54379 1266 POPSTACK;
da51bb9b 1267 stash = gv_stashsv(namesv, 0);
44a2ac75 1268 if (!stash)
b82b06b8
FC
1269 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1270 type, varname, SVfARG(namesv));
45cbc99a 1271 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC
1272 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1273 type, varname, SVfARG(namesv), methpv);
600beb2e 1274 LEAVE;
d2c93421 1275 }
e7881358 1276 else SvREFCNT_dec_NN(namesv);
44a2ac75 1277 return stash;
d2c93421
RH
1278}
1279
954c1994
GS
1280/*
1281=for apidoc gv_stashpv
1282
da51bb9b 1283Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1284determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS
1285
1286=cut
1287*/
1288
a0d0e21e 1289HV*
864dbfa3 1290Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1291{
7918f24d 1292 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57
PP
1293 return gv_stashpvn(name, strlen(name), create);
1294}
1295
bc96cb06
SH
1296/*
1297=for apidoc gv_stashpvn
1298
da51bb9b
NC
1299Returns a pointer to the stash for a specified package. The C<namelen>
1300parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1301to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1302created if it does not already exist. If the package does not exist and
1303C<flags> is 0 (or any other setting that does not create packages) then NULL
1304is returned.
1305
566a4718
YO
1306Flags may be one of:
1307
1308 GV_ADD
1309 SVf_UTF8
1310 GV_NOADD_NOINIT
1311 GV_NOINIT
1312 GV_NOEXPAND
1313 GV_ADDMG
1314
1315The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH
1316
1317=cut
1318*/
1319
dc437b57 1320HV*
da51bb9b 1321Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1322{
0cea0058 1323 char smallbuf[128];
46fc3d4c 1324 char *tmpbuf;
a0d0e21e
LW
1325 HV *stash;
1326 GV *tmpgv;
add0ecde 1327 U32 tmplen = namelen + 2;
dc437b57 1328
7918f24d
NC
1329 PERL_ARGS_ASSERT_GV_STASHPVN;
1330
add0ecde 1331 if (tmplen <= sizeof smallbuf)
46fc3d4c
PP
1332 tmpbuf = smallbuf;
1333 else
add0ecde
VP
1334 Newx(tmpbuf, tmplen, char);
1335 Copy(name, tmpbuf, namelen, char);
1336 tmpbuf[namelen] = ':';
1337 tmpbuf[namelen+1] = ':';
1338 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c
PP
1339 if (tmpbuf != smallbuf)
1340 Safefree(tmpbuf);
a0d0e21e 1341 if (!tmpgv)
da51bb9b 1342 return NULL;
a0d0e21e 1343 stash = GvHV(tmpgv);
1f656fcf 1344 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1345 assert(stash);
1f656fcf 1346 if (!HvNAME_get(stash)) {
0be4d16f 1347 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC
1348
1349 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1350 /* If the containing stash has multiple effective
1351 names, see that this one gets them, too. */
1352 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1353 mro_package_moved(stash, NULL, tmpgv, 1);
1354 }
a0d0e21e 1355 return stash;
463ee0b2
LW
1356}
1357
954c1994
GS
1358/*
1359=for apidoc gv_stashsv
1360
da51bb9b 1361Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS
1362
1363=cut
1364*/
1365
a0d0e21e 1366HV*
da51bb9b 1367Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1368{
dc437b57 1369 STRLEN len;
9d4ba2ae 1370 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC
1371
1372 PERL_ARGS_ASSERT_GV_STASHSV;
1373
0be4d16f 1374 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW
1375}
1376
1377
463ee0b2 1378GV *
fe9845cc 1379Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1380 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1381 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC
1382}
1383
1384GV *
fe9845cc 1385Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1386 STRLEN len;
77cb3b01
FC
1387 const char * const nambeg =
1388 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1389 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC
1390 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1391}
1392
90aeefb4 1393PERL_STATIC_INLINE void
290a1700 1394S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR
1395{
1396 AV* av;
1397
1398 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1399
1400 av = GvAVn(gv);
1401 GvMULTI_on(gv);
1402 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1403 NULL, 0);
ad7cce9f
FR
1404}
1405
90aeefb4
BF
1406/* This function grabs name and tries to split a stash and glob
1407 * from its contents. TODO better description, comments
1408 *
1409 * If the function returns TRUE and 'name == name_end', then
1410 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1411 */
1412PERL_STATIC_INLINE bool
1413S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1414 STRLEN *len, const char *nambeg, STRLEN full_len,
1415 const U32 is_utf8, const I32 add)
1416{
1417 const char *name_cursor;
1418 const char *const name_end = nambeg + full_len;
1419 const char *const name_em1 = name_end - 1;
1420
1421 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1422
1423 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1424 /* accidental stringify on a GV? */
1425 (*name)++;
1426 }
1427
1428 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1429 if (name_cursor < name_em1 &&
1430 ((*name_cursor == ':' && name_cursor[1] == ':')
1431 || *name_cursor == '\''))
1432 {
1433 if (!*stash)
1434 *stash = PL_defstash;
1435 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1436 return FALSE;
1437
1438 *len = name_cursor - *name;
1439 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1440 const char *key;
1441 GV**gvp;
1442 if (*name_cursor == ':') {
1443 key = *name;
1444 *len += 2;
1445 }
1446 else {
1447 char *tmpbuf;
1448 Newx(tmpbuf, *len+2, char);
1449 Copy(*name, tmpbuf, *len, char);
1450 tmpbuf[(*len)++] = ':';
1451 tmpbuf[(*len)++] = ':';
1452 key = tmpbuf;
1453 }
1454 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -(*len) : *len, add);
1455 *gv = gvp ? *gvp : NULL;
1456 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1457 if (SvTYPE(*gv) != SVt_PVGV)
1458 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1459 else
1460 GvMULTI_on(*gv);
1461 }
1462 if (key != *name)
1463 Safefree(key);
1464 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1465 return FALSE;
1466
1467 if (!(*stash = GvHV(*gv))) {
1468 *stash = GvHV(*gv) = newHV();
1469 if (!HvNAME_get(*stash)) {
1470 if (GvSTASH(*gv) == PL_defstash && *len == 6
1471 && strnEQ(*name, "CORE", 4))
1472 hv_name_set(*stash, "CORE", 4, 0);
1473 else
1474 hv_name_set(
1475 *stash, nambeg, name_cursor-nambeg, is_utf8
1476 );
1477 /* If the containing stash has multiple effective
1478 names, see that this one gets them, too. */
1479 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1480 mro_package_moved(*stash, NULL, *gv, 1);
1481 }
1482 }
1483 else if (!HvNAME_get(*stash))
1484 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1485 }
1486
1487 if (*name_cursor == ':')
1488 name_cursor++;
1489 *name = name_cursor+1;
1490 if (*name == name_end) {
1491 if (!*gv)
1492 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1493 return TRUE;
1494 }
1495 }
1496 }
1497 *len = name_cursor - *name;
1498 return TRUE;
1499}
1500
536d1a88 1501/* Checks if an unqualified name is in the main stash */
90aeefb4 1502PERL_STATIC_INLINE bool
536d1a88 1503S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1504{
536d1a88 1505 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1506
90aeefb4 1507 /* If it's an alphanumeric variable */
536d1a88 1508 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF
1509 /* Some "normal" variables are always in main::,
1510 * like INC or STDOUT.
1511 */
1512 switch (len) {
1513 case 1:
1514 if (*name == '_')
536d1a88 1515 return TRUE;
90aeefb4
BF
1516 break;
1517 case 3:
1518 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1519 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1520 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1521 return TRUE;
90aeefb4
BF
1522 break;
1523 case 4:
1524 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1525 && name[3] == 'V')
536d1a88 1526 return TRUE;
90aeefb4
BF
1527 break;
1528 case 5:
1529 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1530 && name[3] == 'I' && name[4] == 'N')
536d1a88 1531 return TRUE;
90aeefb4
BF
1532 break;
1533 case 6:
1534 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1535 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1536 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1537 return TRUE;
90aeefb4
BF
1538 break;
1539 case 7:
1540 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1541 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1542 && name[6] == 'T')
536d1a88 1543 return TRUE;
90aeefb4
BF
1544 break;
1545 }
536d1a88
BF
1546 }
1547 /* *{""}, or a special variable like $@ */
1548 else
1549 return TRUE;
1550
1551 return FALSE;
1552}
1553
1554
1555/* This function is called if parse_gv_stash_name() failed to
1556 * find a stash, or if GV_NOTQUAL or an empty name was passed
1557 * to gv_fetchpvn_flags.
1558 *
1559 * It returns FALSE if the default stash can't be found nor created,
1560 * which might happen during global destruction.
1561 */
1562PERL_STATIC_INLINE bool
1563S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1564 const U32 is_utf8, const I32 add,
1565 const svtype sv_type)
1566{
1567 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1568
1569 /* No stash in name, so see how we can default */
90aeefb4 1570
536d1a88
BF
1571 if ( gv_is_in_main(name, len, is_utf8) ) {
1572 *stash = PL_defstash;
1573 }
1574 else {
1575 if (IN_PERL_COMPILETIME) {
90aeefb4
BF
1576 *stash = PL_curstash;
1577 if (add && (PL_hints & HINT_STRICT_VARS) &&
1578 sv_type != SVt_PVCV &&
1579 sv_type != SVt_PVGV &&
1580 sv_type != SVt_PVFM &&
1581 sv_type != SVt_PVIO &&
1582 !(len == 1 && sv_type == SVt_PV &&
1583 (*name == 'a' || *name == 'b')) )
1584 {
1585 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -len : len,0);
1586 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1587 SvTYPE(*gvp) != SVt_PVGV)
1588 {
1589 *stash = NULL;
1590 }
1591 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1592 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1593 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1594 {
1595 /* diag_listed_as: Variable "%s" is not imported%s */
1596 Perl_ck_warner_d(
1597 aTHX_ packWARN(WARN_MISC),
1598 "Variable \"%c%"UTF8f"\" is not imported",
1599 sv_type == SVt_PVAV ? '@' :
1600 sv_type == SVt_PVHV ? '%' : '$',
1601 UTF8fARG(is_utf8, len, name));
1602 if (GvCVu(*gvp))
1603 Perl_ck_warner_d(
1604 aTHX_ packWARN(WARN_MISC),
1605 "\t(Did you mean &%"UTF8f" instead?)\n",
1606 UTF8fARG(is_utf8, len, name)
1607 );
1608 *stash = NULL;
1609 }
1610 }
1611 }
1612 else {
1613 /* Use the current op's stash */
1614 *stash = CopSTASH(PL_curcop);
1615 }
1616 }
90aeefb4
BF
1617
1618 if (!*stash) {
1619 if (add && !PL_in_clean_all) {
1620 SV * const err = Perl_mess(aTHX_
1621 "Global symbol \"%s%"UTF8f
1622 "\" requires explicit package name",
1623 (sv_type == SVt_PV ? "$"
1624 : sv_type == SVt_PVAV ? "@"
1625 : sv_type == SVt_PVHV ? "%"
1626 : ""), UTF8fARG(is_utf8, len, name));
1627 GV *gv;
1628 if (is_utf8)
1629 SvUTF8_on(err);
1630 qerror(err);
cd164bf8
BF
1631 /* To maintain the output of errors after the strict exception
1632 * above, and to keep compat with older releases, rather than
1633 * placing the variables in the pad, we place
1634 * them in the <none>:: stash.
1635 */
90aeefb4
BF
1636 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1637 if (!gv) {
1638 /* symbol table under destruction */
1639 return FALSE;
1640 }
1641 *stash = GvHV(gv);
1642 }
1643 else
1644 return FALSE;
1645 }
1646
1647 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1648 return FALSE;
1649
1650 return TRUE;
1651}
1652
930867a8
BF
1653/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1654 * a new GV.
1655 * Note that it does not insert the GV into the stash prior to
1656 * magicalization, which some variables require need in order
1657 * to work (like $[, %+, %-, %!), so callers must take care of
1658 * that beforehand.
1659 *
1660 * The return value has a specific meaning for gv_fetchpvn_flags:
1661 * If it returns true, and the gv is empty, it indicates that its
1662 * refcount should be decreased.
1663 */
1664PERL_STATIC_INLINE bool
1665S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1666 bool addmg, const svtype sv_type)
79072805 1667{
960b831f 1668 SSize_t paren;
79072805 1669
930867a8 1670 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1671
44428a46 1672 if (stash != PL_defstash) { /* not the main stash */
5fdfd519 1673 /* We only have to check for three names here: EXPORT, ISA
4aaa4757
FC
1674 and VERSION. All the others apply only to the main stash or to
1675 CORE (which is checked right after this). */
f4e68e82 1676 if (len > 2) {
b464bac0 1677 const char * const name2 = name + 1;
cc4c2da6 1678 switch (*name) {
cc4c2da6
NC
1679 case 'E':
1680 if (strnEQ(name2, "XPORT", 5))
1681 GvMULTI_on(gv);
1682 break;
1683 case 'I':
44428a46 1684 if (strEQ(name2, "SA"))
290a1700 1685 gv_magicalize_isa(gv);
cc4c2da6 1686 break;
44428a46
FC
1687 case 'V':
1688 if (strEQ(name2, "ERSION"))
1689 GvMULTI_on(gv);
1690 break;
4aaa4757
FC
1691 default:
1692 goto try_core;
1693 }
930867a8 1694 return addmg;
4aaa4757
FC
1695 }
1696 try_core:
1697 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1698 /* Avoid null warning: */
1699 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC
1700 if (strnEQ(stashname, "CORE", 4))
1701 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC
1702 }
1703 }
1704 else if (len > 1) {
1705#ifndef EBCDIC
1706 if (*name > 'V' ) {
1707 NOOP;
1708 /* Nothing else to do.
1709 The compiler will probably turn the switch statement into a
1710 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW
1711 the common case of lower case variable names. (On EBCDIC
1712 platforms, we can't just do:
1713 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1714 because cases like '\027' in the switch statement below are
1715 C1 (non-ASCII) controls on those platforms, so the remapping
1716 would make them larger than 'V')
1717 */
44428a46
FC
1718 } else
1719#endif
1720 {
1721 const char * const name2 = name + 1;
1722 switch (*name) {
1723 case 'A':
1724 if (strEQ(name2, "RGV")) {
1725 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1726 }
1727 else if (strEQ(name2, "RGVOUT")) {
1728 GvMULTI_on(gv);
1729 }
1730 break;
1731 case 'E':
1732 if (strnEQ(name2, "XPORT", 5))
1733 GvMULTI_on(gv);
1734 break;
1735 case 'I':
1736 if (strEQ(name2, "SA")) {
290a1700 1737 gv_magicalize_isa(gv);
44428a46
FC
1738 }
1739 break;
cc4c2da6
NC
1740 case 'S':
1741 if (strEQ(name2, "IG")) {
1742 HV *hv;
1743 I32 i;
d525a7b2
NC
1744 if (!PL_psig_name) {
1745 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1746 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1747 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC
1748 } else {
1749 /* I think that the only way to get here is to re-use an
1750 embedded perl interpreter, where the previous
1751 use didn't clean up fully because
1752 PL_perl_destruct_level was 0. I'm not sure that we
1753 "support" that, in that I suspect in that scenario
1754 there are sufficient other garbage values left in the
1755 interpreter structure that something else will crash
1756 before we get here. I suspect that this is one of
1757 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1758 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1759 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC
1760 }
1761 GvMULTI_on(gv);
1762 hv = GvHVn(gv);
a0714e2c 1763 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1764 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1765 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC
1766 if (init)
1767 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC
1768 }
1769 }
1770 break;
1771 case 'V':
1772 if (strEQ(name2, "ERSION"))
1773 GvMULTI_on(gv);
1774 break;
e5218da5
GA
1775 case '\003': /* $^CHILD_ERROR_NATIVE */
1776 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1777 goto magicalize;
1778 break;
cc4c2da6
NC
1779 case '\005': /* $^ENCODING */
1780 if (strEQ(name2, "NCODING"))
1781 goto magicalize;
1782 break;
9ebf26ad
FR
1783 case '\007': /* $^GLOBAL_PHASE */
1784 if (strEQ(name2, "LOBAL_PHASE"))
1785 goto ro_magicalize;
1786 break;
8561ea1d
FC
1787 case '\014': /* $^LAST_FH */
1788 if (strEQ(name2, "AST_FH"))
1789 goto ro_magicalize;
1790 break;
cde0cee5 1791 case '\015': /* $^MATCH */
960b831f
NC
1792 if (strEQ(name2, "ATCH")) {
1793 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1794 goto storeparen;
1795 }
66230c86 1796 break;
cc4c2da6
NC
1797 case '\017': /* $^OPEN */
1798 if (strEQ(name2, "PEN"))
1799 goto magicalize;
1800 break;
cde0cee5 1801 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC
1802 if (strEQ(name2, "REMATCH")) {
1803 paren = RX_BUFF_IDX_CARET_PREMATCH;
1804 goto storeparen;
1805 }
1806 if (strEQ(name2, "OSTMATCH")) {
1807 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1808 goto storeparen;
1809 }
9ebf26ad 1810 break;
cc4c2da6
NC
1811 case '\024': /* ${^TAINT} */
1812 if (strEQ(name2, "AINT"))
1813 goto ro_magicalize;
1814 break;
7cebcbc0 1815 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1816 if (strEQ(name2, "NICODE"))
cc4c2da6 1817 goto ro_magicalize;
a0288114 1818 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1819 goto ro_magicalize;
e07ea26a
NC
1820 if (strEQ(name2, "TF8CACHE"))
1821 goto magicalize;
cc4c2da6
NC
1822 break;
1823 case '\027': /* $^WARNING_BITS */
1824 if (strEQ(name2, "ARNING_BITS"))
1825 goto magicalize;
1826 break;
1827 case '1':
1828 case '2':
1829 case '3':
1830 case '4':
1831 case '5':
1832 case '6':
1833 case '7':
1834 case '8':
1835 case '9':
85e6fe83 1836 {
2fdbfb4d
AB
1837 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1838 this test */
1839 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC
1840 const char *end = name + len;
1841 while (--end > name) {
930867a8
BF
1842 if (!isDIGIT(*end))
1843 return addmg;
cc4c2da6 1844 }
960b831f
NC
1845 paren = strtoul(name, NULL, 10);
1846 goto storeparen;
1d7c1841 1847 }
dc437b57 1848 }
93a17b20 1849 }
392db708
NC
1850 } else {
1851 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1852 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1853 switch (*name) {
6361f656 1854 case '&': /* $& */
960b831f
NC
1855 paren = RX_BUFF_IDX_FULLMATCH;
1856 goto sawampersand;
6361f656 1857 case '`': /* $` */
960b831f
NC
1858 paren = RX_BUFF_IDX_PREMATCH;
1859 goto sawampersand;
6361f656 1860 case '\'': /* $' */
960b831f
NC
1861 paren = RX_BUFF_IDX_POSTMATCH;
1862 sawampersand:
1a904fc8 1863#ifdef PERL_SAWAMPERSAND
a289ef89 1864 if (!(
cc4c2da6
NC
1865 sv_type == SVt_PVAV ||
1866 sv_type == SVt_PVHV ||
1867 sv_type == SVt_PVCV ||
1868 sv_type == SVt_PVFM ||
1869 sv_type == SVt_PVIO
d3b97530
DM
1870 )) { PL_sawampersand |=
1871 (*name == '`')
1872 ? SAWAMPERSAND_LEFT
1873 : (*name == '&')
1874 ? SAWAMPERSAND_MIDDLE
1875 : SAWAMPERSAND_RIGHT;
1876 }
1a904fc8 1877#endif
960b831f 1878 goto storeparen;
e91d8259
NC
1879 case '1': /* $1 */
1880 case '2': /* $2 */
1881 case '3': /* $3 */
1882 case '4': /* $4 */
1883 case '5': /* $5 */
1884 case '6': /* $6 */
1885 case '7': /* $7 */
1886 case '8': /* $8 */
1887 case '9': /* $9 */
960b831f
NC
1888 paren = *name - '0';
1889
1890 storeparen:
e91d8259
NC
1891 /* Flag the capture variables with a NULL mg_ptr
1892 Use mg_len for the array index to lookup. */
960b831f 1893 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1894 break;
cc4c2da6 1895
6361f656 1896 case ':': /* $: */
c69033f2 1897 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC
1898 goto magicalize;
1899
6361f656 1900 case '?': /* $? */
ff0cee69 1901#ifdef COMPLEX_STATUS
c69033f2 1902 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1903#endif
cc4c2da6 1904 goto magicalize;
ff0cee69 1905
6361f656 1906 case '!': /* $! */
67261566 1907 GvMULTI_on(gv);
44a2ac75 1908 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1909
ad64d0ec 1910 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1911
44a2ac75 1912 /* magicalization must be done before require_tie_mod is called */
67261566 1913 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 1914 {
44a2ac75 1915 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 1916 addmg = FALSE;
ffdb8bcd 1917 }
d2c93421 1918
6cef1e77 1919 break;
6361f656
AB
1920 case '-': /* $- */
1921 case '+': /* $+ */
44a2ac75
YO
1922 GvMULTI_on(gv); /* no used once warnings here */
1923 {
44a2ac75 1924 AV* const av = GvAVn(gv);
ad64d0ec 1925 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1926
ad64d0ec
NC
1927 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1928 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1929 if (avc)
44a2ac75 1930 SvREADONLY_on(GvSVn(gv));
44a2ac75 1931 SvREADONLY_on(av);
67261566
YO
1932
1933 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 1934 {
192b9cd1 1935 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 1936 addmg = FALSE;
213084e4 1937 }
67261566 1938
80305961 1939 break;
cc4c2da6 1940 }
6361f656
AB
1941 case '*': /* $* */
1942 case '#': /* $# */
9b387841 1943 if (sv_type == SVt_PV)
4f650b80 1944 /* diag_listed_as: $* is no longer supported */
9b387841 1945 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1946 "$%c is no longer supported", *name);
8ae1fe26 1947 break;
b3ca2e83
NC
1948 case '\010': /* $^H */
1949 {
1950 HV *const hv = GvHVn(gv);
1951 hv_magic(hv, NULL, PERL_MAGIC_hints);
1952 }
1953 goto magicalize;
b82b06b8 1954 case '[': /* $[ */
7d69d4a6 1955 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1956 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 1957 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 1958 addmg = FALSE;
b82b06b8 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 1966 case '0': /* $0 */
6361f656
AB
1967 case '^': /* $^ */
1968 case '~': /* $~ */
1969 case '=': /* $= */
1970 case '%': /* $% */
1971 case '.': /* $. */
1972 case '(': /* $( */
1973 case ')': /* $) */
1974 case '<': /* $< */
1975 case '>': /* $> */
1976 case '\\': /* $\ */
1977 case '/': /* $/ */
4505a31f 1978 case '|': /* $| */
9cdac2a2 1979 case '$': /* $$ */
cc4c2da6
NC
1980 case '\001': /* $^A */
1981 case '\003': /* $^C */
1982 case '\004': /* $^D */
1983 case '\005': /* $^E */
1984 case '\006': /* $^F */
cc4c2da6
NC
1985 case '\011': /* $^I, NOT \t in EBCDIC */
1986 case '\016': /* $^N */
1987 case '\017': /* $^O */
1988 case '\020': /* $^P */
1989 case '\024': /* $^T */
1990 case '\027': /* $^W */
1991 magicalize:
ad64d0ec 1992 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 1993 break;
e521374c 1994
cc4c2da6 1995 case '\014': /* $^L */
76f68e9b 1996 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 1997 break;
6361f656 1998 case ';': /* $; */
76f68e9b 1999 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2000 break;
6361f656 2001 case ']': /* $] */
cc4c2da6 2002 {
3638bf15 2003 SV * const sv = GvSV(gv);
d7aa5382 2004 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2005 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH
2006 GvSV(gv) = vnumify(PL_patchlevel);
2007 SvREADONLY_on(GvSV(gv));
2008 SvREFCNT_dec(sv);
93a17b20
LW
2009 }
2010 break;
cc4c2da6
NC
2011 case '\026': /* $^V */
2012 {
3638bf15 2013 SV * const sv = GvSV(gv);
f9be5ac8
DM
2014 GvSV(gv) = new_version(PL_patchlevel);
2015 SvREADONLY_on(GvSV(gv));
2016 SvREFCNT_dec(sv);
16070b82
GS
2017 }
2018 break;
cc4c2da6 2019 }
79072805 2020 }
930867a8
BF
2021
2022 return addmg;
71c35c05
BF
2023}
2024
070dc475
BF
2025/* This function is called when the stash already holds the GV of the magic
2026 * variable we're looking for, but we need to check that it has the correct
2027 * kind of magic. For example, if someone first uses $! and then %!, the
2028 * latter would end up here, and we add the Errno tie to the HASH slot of
2029 * the *! glob.
2030 */
2031PERL_STATIC_INLINE void
2032S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2033{
2034 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2035
2036 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2037 if (*name == '!')
2038 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2039 else if (*name == '-' || *name == '+')
2040 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2041 } else if (sv_type == SVt_PV) {
2042 if (*name == '*' || *name == '#') {
2043 /* diag_listed_as: $* is no longer supported */
2044 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2045 WARN_SYNTAX),
2046 "$%c is no longer supported", *name);
2047 }
2048 }
2049 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2050 switch (*name) {
2051 case '[':
2052 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2053 break;
2054#ifdef PERL_SAWAMPERSAND
2055 case '`':
2056 PL_sawampersand |= SAWAMPERSAND_LEFT;
2057 (void)GvSVn(gv);
2058 break;
2059 case '&':
2060 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2061 (void)GvSVn(gv);
2062 break;
2063 case '\'':
2064 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2065 (void)GvSVn(gv);
2066 break;
2067#endif
2068 }
2069 }
2070}
2071
71c35c05
BF
2072GV *
2073Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2074 const svtype sv_type)
2075{
2076 dVAR;
2077 const char *name = nambeg;
2078 GV *gv = NULL;
2079 GV**gvp;
2080 STRLEN len;
2081 HV *stash = NULL;
2082 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2083 const I32 no_expand = flags & GV_NOEXPAND;
2084 const I32 add = flags & ~GV_NOADD_MASK;
2085 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2086 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF
2087 const char *const name_end = nambeg + full_len;
2088 U32 faking_it;
2089
2090 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2091
2092 /* If we have GV_NOTQUAL, the caller promised that
2093 * there is no stash, so we can skip the check.
2094 * Similarly if full_len is 0, since then we're
2095 * dealing with something like *{""} or ""->foo()
2096 */
2097 if ((flags & GV_NOTQUAL) || !full_len) {
2098 len = full_len;
2099 }
2100 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2101 if (name == name_end) return gv;
2102 }
2103 else {
2104 return NULL;
2105 }
2106
2107 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2108 return NULL;
2109 }
2110
2111 /* By this point we should have a stash and a name */
2112 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
2113 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2114 if (addmg) gv = (GV *)newSV(0);
2115 else return NULL;
2116 }
2117 else gv = *gvp, addmg = 0;
2118 /* From this point on, addmg means gv has not been inserted in the
2119 symtab yet. */
2120
2121 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF
2122 /* The GV already exists, so return it, but check if we need to do
2123 * anything else with it before that.
2124 */
71c35c05 2125 if (add) {
c002ae9a
BF
2126 /* This is the heuristic that handles if a variable triggers the
2127 * 'used only once' warning. If there's already a GV in the stash
2128 * with this name, then we assume that the variable has been used
2129 * before and turn its MULTI flag on.
2130 * It's a heuristic because it can easily be "tricked", like with
2131 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2132 * not warning about $main::foo being used just once
2133 */
71c35c05
BF
2134 GvMULTI_on(gv);
2135 gv_init_svtype(gv, sv_type);
2136 /* You reach this path once the typeglob has already been created,
2137 either by the same or a different sigil. If this path didn't
2138 exist, then (say) referencing $! first, and %! second would
2139 mean that %! was not handled correctly. */
2140 if (len == 1 && stash == PL_defstash) {
070dc475 2141 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF
2142 }
2143 else if (len == 3 && sv_type == SVt_PVAV
2144 && strnEQ(name, "ISA", 3)
2145 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2146 gv_magicalize_isa(gv);
2147 }
2148 return gv;
2149 } else if (no_init) {
2150 assert(!addmg);
2151 return gv;
c002ae9a
BF
2152 }
2153 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2154 * don't expand it to a glob. This is an optimization so that things
2155 * copying constants over, like Exporter, don't have to be rewritten
2156 * to take into account that you can store more than just globs in
2157 * stashes.
2158 */
2159 else if (no_expand && SvROK(gv)) {
71c35c05
BF
2160 assert(!addmg);
2161 return gv;
2162 }
2163
2164 /* Adding a new symbol.
2165 Unless of course there was already something non-GV here, in which case
2166 we want to behave as if there was always a GV here, containing some sort
2167 of subroutine.
2168 Otherwise we run the risk of creating things like GvIO, which can cause
2169 subtle bugs. eg the one that tripped up SQL::Translator */
2170
2171 faking_it = SvOK(gv);
2172
2173 if (add & GV_ADDWARN)
2174 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2175 "Had to create %"UTF8f" unexpectedly",
2176 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2177 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2178
9e5de6ae 2179 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF
2180 GvMULTI_on(gv) ;
2181
930867a8
BF
2182 /* First, store the gv in the symtab if we're adding magic,
2183 * but only for non-empty GVs
2184 */
2185#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2186 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2187
2188 if ( addmg && !GvEMPTY(gv) ) {
2189 (void)hv_store(stash,name,len,(SV *)gv,0);
2190 }
2191
71c35c05 2192 /* set up magic where warranted */
930867a8
BF
2193 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2194 /* See 23496c6 */
2195 if (GvEMPTY(gv)) {
2196 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2197 /* The GV was and still is "empty", except that now
2198 * it has the magic flags turned on, so we want it
2199 * stored in the symtab.
2200 */
2201 (void)hv_store(stash,name,len,(SV *)gv,0);
2202 }
2203 else {
2204 /* Most likely the temporary GV created above */
2205 SvREFCNT_dec_NN(gv);
2206 gv = NULL;
2207 }
2208 }
2209 }
71c35c05 2210
e6066781 2211 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2212 return gv;
79072805
LW
2213}
2214
2215void
35a4481c 2216Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2217{
ed60a868 2218 const char *name;
35a4481c 2219 const HV * const hv = GvSTASH(gv);
7918f24d
NC
2220
2221 PERL_ARGS_ASSERT_GV_FULLNAME4;
2222
666ea192 2223 sv_setpv(sv, prefix ? prefix : "");
a0288114 2224
52a6327b 2225 if (hv && (name = HvNAME(hv))) {
ed60a868
FC
2226 const STRLEN len = HvNAMELEN(hv);
2227 if (keepmain || strnNE(name, "main", len)) {
2228 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2229 sv_catpvs(sv,"::");
ed60a868 2230 }
43693395 2231 }
ed60a868 2232 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2233 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS
2234}
2235
2236void
35a4481c 2237Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2238{
099be4f1 2239 const GV * const egv = GvEGVx(gv);
7918f24d
NC
2240
2241 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2242
46c461b5 2243 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS
2244}
2245
79072805 2246void
51da40ed 2247Perl_gv_check(pTHX_ HV *stash)
79072805 2248{
97aff369 2249 dVAR;
eb578fdb 2250 I32 i;
463ee0b2 2251
7918f24d
NC
2252 PERL_ARGS_ASSERT_GV_CHECK;
2253
8990e307
LW
2254 if (!HvARRAY(stash))
2255 return;
a0d0e21e 2256 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2257 const HE *entry;
51da40ed
FC
2258 /* SvIsCOW is unused on HVs, so we can use it to mark stashes we
2259 are currently searching through recursively. */
2260 SvIsCOW_on(stash);
dc437b57 2261 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2262 GV *gv;
b7787f18 2263 HV *hv;
dc437b57 2264 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2265 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2266 {
51da40ed 2267 if (hv != PL_defstash && hv != stash && !SvIsCOW(hv))
a0d0e21e
LW
2268 gv_check(hv); /* nested package */
2269 }
ecad31f0
BF
2270 else if ( *HeKEY(entry) != '_'
2271 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2272 const char *file;
159b6efe 2273 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2274 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2275 continue;
1d7c1841 2276 file = GvFILE(gv);
1d7c1841 2277 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC
2278#ifdef USE_ITHREADS
2279 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2280#else
2281 CopFILEGV(PL_curcop)
2282 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2283#endif
9014280d 2284 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC
2285 "Name \"%"HEKf"::%"HEKf
2286 "\" used only once: possible typo",
2287 HEKfARG(HvNAME_HEK(stash)),
2288 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2289 }
79072805 2290 }
51da40ed 2291 SvIsCOW_off(stash);
79072805
LW
2292 }
2293}
2294
2295GV *
9cc50d5b 2296Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2297{
97aff369 2298 dVAR;
9cc50d5b 2299 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2300 assert(!(flags & ~SVf_UTF8));
7918f24d 2301
b17a0679
FC
2302 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2303 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF
2304 (long)PL_gensym++),
2305 GV_ADD, SVt_PVGV);
79072805
LW
2306}
2307
2308/* hopefully this is only called on local symbol table entries */
2309
2310GP*
864dbfa3 2311Perl_gp_ref(pTHX_ GP *gp)
79072805 2312{
97aff369 2313 dVAR;
1d7c1841 2314 if (!gp)
d4c19fe8 2315 return NULL;
79072805 2316 gp->gp_refcnt++;
44a8e56a
PP
2317 if (gp->gp_cv) {
2318 if (gp->gp_cvgen) {
e1a479c5
BB
2319 /* If the GP they asked for a reference to contains
2320 a method cache entry, clear it first, so that we
2321 don't infect them with our cached entry */
e7881358 2322 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2323 gp->gp_cv = NULL;
44a8e56a
PP
2324 gp->gp_cvgen = 0;
2325 }
44a8e56a 2326 }
79072805 2327 return gp;
79072805
LW
2328}
2329
2330void
864dbfa3 2331Perl_gp_free(pTHX_ GV *gv)
79072805 2332{
97aff369 2333 dVAR;
79072805 2334 GP* gp;
b0d55c99 2335 int attempts = 100;
79072805 2336
f7877b28 2337 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2338 return;
f248d071 2339 if (gp->gp_refcnt == 0) {
9b387841
NC
2340 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2341 "Attempt to free unreferenced glob pointers"
2342 pTHX__FORMAT pTHX__VALUE);
79072805
LW
2343 return;
2344 }
748a9306
LW
2345 if (--gp->gp_refcnt > 0) {
2346 if (gp->gp_egv == gv)
2347 gp->gp_egv = 0;
c43ae56f 2348 GvGP_set(gv, NULL);
79072805 2349 return;
748a9306 2350 }
79072805 2351
b0d55c99
FC
2352 while (1) {
2353 /* Copy and null out all the glob slots, so destructors do not see
2354 freed SVs. */
2355 HEK * const file_hek = gp->gp_file_hek;
2356 SV * const sv = gp->gp_sv;
2357 AV * const av = gp->gp_av;
2358 HV * const hv = gp->gp_hv;
2359 IO * const io = gp->gp_io;
2360 CV * const cv = gp->gp_cv;
2361 CV * const form = gp->gp_form;
2362
2363 gp->gp_file_hek = NULL;
2364 gp->gp_sv = NULL;
2365 gp->gp_av = NULL;
2366 gp->gp_hv = NULL;
2367 gp->gp_io = NULL;
2368 gp->gp_cv = NULL;
2369 gp->gp_form = NULL;
2370
2371 if (file_hek)
2372 unshare_hek(file_hek);
2373
2374 SvREFCNT_dec(sv);
2375 SvREFCNT_dec(av);
2376 /* FIXME - another reference loop GV -> symtab -> GV ?
2377 Somehow gp->gp_hv can end up pointing at freed garbage. */
2378 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2379 const HEK *hvname_hek = HvNAME_HEK(hv);
103f5a36 2380 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", hvname_hek));
c2242065
BF
2381 if (PL_stashcache && hvname_hek)
2382 (void)hv_delete(PL_stashcache, HEK_KEY(hvname_hek),
2383 (HEK_UTF8(hvname_hek) ? -HEK_LEN(hvname_hek) : HEK_LEN(hvname_hek)),
2384 G_DISCARD);
b0d55c99
FC
2385 SvREFCNT_dec(hv);
2386 }
2387 SvREFCNT_dec(io);
2388 SvREFCNT_dec(cv);
2389 SvREFCNT_dec(form);
2390
2391 if (!gp->gp_file_hek
2392 && !gp->gp_sv
2393 && !gp->gp_av
2394 && !gp->gp_hv
2395 && !gp->gp_io
2396 && !gp->gp_cv
2397 && !gp->gp_form) break;
2398
2399 if (--attempts == 0) {
2400 Perl_die(aTHX_
2401 "panic: gp_free failed to free glob pointer - "
2402 "something is repeatedly re-creating entries"
2403 );
2404 }
13207a71 2405 }
748a9306 2406
79072805 2407 Safefree(gp);
c43ae56f 2408 GvGP_set(gv, NULL);
79072805
LW
2409}
2410
d460ef45
NIS
2411int
2412Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2413{
53c1dcc0
AL
2414 AMT * const amtp = (AMT*)mg->mg_ptr;
2415 PERL_UNUSED_ARG(sv);
dd374669 2416
7918f24d
NC
2417 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2418
d460ef45
NIS
2419 if (amtp && AMT_AMAGIC(amtp)) {
2420 int i;
2421 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2422 CV * const cv = amtp->table[i];
b37c2d43 2423 if (cv) {
e7881358 2424 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2425 amtp->table[i] = NULL;
d460ef45
NIS
2426 }
2427 }
2428 }
2429 return 0;
2430}
2431
a0d0e21e 2432/* Updates and caches the CV's */
c3a9a790
RGS
2433/* Returns:
2434 * 1 on success and there is some overload
2435 * 0 if there is no overload
2436 * -1 if some error occurred and it couldn't croak
2437 */
a0d0e21e 2438
c3a9a790 2439int
242f8760 2440Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2441{
97aff369 2442 dVAR;
ad64d0ec 2443 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2444 AMT amt;
9b439311 2445 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2446 U32 newgen;
a0d0e21e 2447
7918f24d
NC
2448 PERL_ARGS_ASSERT_GV_AMUPDATE;
2449
9b439311 2450 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC
2451 if (mg) {
2452 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2453 if (amtp->was_ok_sub == newgen) {
8c34e50d 2454 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2455 }
ad64d0ec 2456 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2457 }
a0d0e21e 2458
bfcb3514 2459 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2460
d460ef45 2461 Zero(&amt,1,AMT);
e1a479c5 2462 amt.was_ok_sub = newgen;
a6006777
PP
2463 amt.fallback = AMGfallNO;
2464 amt.flags = 0;
2465
a6006777 2466 {
8c34e50d
FC
2467 int filled = 0;
2468 int i;
a6006777 2469
3866ea3b 2470 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2471
89ffc314 2472 /* Try to find via inheritance. */
e6919483 2473 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2474 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2475 CV* cv;
89ffc314
IZ
2476
2477 if (!gv)
3866ea3b
FC
2478 {
2479 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2480 goto no_table;
3866ea3b
FC
2481 }
2482#ifdef PERL_DONT_CREATE_GVSV
2483 else if (!sv) {
6f207bd3 2484 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC
2485 }
2486#endif
79c9643d
JL
2487 else if (SvTRUE(sv))
2488 /* don't need to set overloading here because fallback => 1
2489 * is the default setting for classes without overloading */
89ffc314 2490 amt.fallback=AMGfallYES;
79c9643d
JL
2491 else if (SvOK(sv)) {
2492 amt.fallback=AMGfallNEVER;
386a5489 2493 filled = 1;
386a5489 2494 }
79c9643d 2495 else {
386a5489 2496 filled = 1;
386a5489 2497 }
a6006777 2498
8c34e50d 2499 for (i = 1; i < NofAMmeth; i++) {
6136c704 2500 const char * const cooky = PL_AMG_names[i];
32251b26 2501 /* Human-readable form, for debugging: */
8c34e50d 2502 const char * const cp = AMG_id2name(i);
d279ab82 2503 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2504
a0288114 2505 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2506 cp, HvNAME_get(stash)) );
611c1e95
IZ
2507 /* don't fill the cache while looking up!
2508 Creation of inheritance stubs in intermediate packages may
2509 conflict with the logic of runtime method substitution.
2510 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2511 then we could have created stubs for "(+0" in A and C too.
2512 But if B overloads "bool", we may want to use it for
2513 numifying instead of C's "+0". */
8c34e50d 2514 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2515 cv = 0;
89ffc314 2516 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC
2517 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2518 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2519 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2520 && strEQ(hvname, "overload")) {
611c1e95
IZ
2521 /* This is a hack to support autoloading..., while
2522 knowing *which* methods were declared as overloaded. */
44a8e56a 2523 /* GvSV contains the name of the method. */
6136c704 2524 GV *ngv = NULL;
c69033f2 2525 SV *gvsv = GvSV(gv);
a0288114
AL
2526
2527 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2528 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2529 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2530 if (!gvsv || !SvPOK(gvsv)
7f415459 2531 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2532 {
a0288114 2533 /* Can be an import stub (created by "can"). */
242f8760 2534 if (destructing) {
c3a9a790 2535 return -1;
242f8760
RGS
2536 }
2537 else {
d66cca07
BF
2538 const SV * const name = (gvsv && SvPOK(gvsv))
2539 ? gvsv
2540 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2541 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF
2542 Perl_croak(aTHX_ "%s method \"%"SVf256
2543 "\" overloading \"%s\" "\
d0c0e7dd 2544 "in package \"%"HEKf256"\"",
242f8760
RGS
2545 (GvCVGEN(gv) ? "Stub found while resolving"
2546 : "Can't resolve"),
d66cca07 2547 SVfARG(name), cp,
d0c0e7dd 2548 HEKfARG(
d66cca07 2549 HvNAME_HEK(stash)
d0c0e7dd 2550 ));
242f8760 2551 }
44a8e56a 2552 }
dc848c6f 2553 cv = GvCV(gv = ngv);
f0e9f182 2554 }
44a8e56a 2555 }
b464bac0 2556 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2557 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a
PP
2558 GvNAME(CvGV(cv))) );
2559 filled = 1;
611c1e95 2560 } else if (gv) { /* Autoloaded... */
ea726b52 2561 cv = MUTABLE_CV(gv);
611c1e95 2562 filled = 1;
44a8e56a 2563 }
ea726b52 2564 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
a0d0e21e 2565 }
a0d0e21e 2566 if (filled) {
a6006777 2567 AMT_AMAGIC_on(&amt);
ad64d0ec 2568 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2569 (char*)&amt, sizeof(AMT));
8c34e50d 2570 return TRUE;
a0d0e21e
LW
2571 }
2572 }
a6006777 2573 /* Here we have no table: */
8c34e50d 2574 no_table:
a6006777 2575 AMT_AMAGIC_off(&amt);
ad64d0ec 2576 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2577 (char*)&amt, sizeof(AMTS));
c3a9a790 2578 return 0;
a0d0e21e
LW
2579}
2580
32251b26
IZ
2581
2582CV*
2583Perl_gv_handler(pTHX_ HV *stash, I32 id)
2584{
97aff369 2585 dVAR;
3f8f4626 2586 MAGIC *mg;
32251b26 2587 AMT *amtp;
e1a479c5 2588 U32 newgen;
9b439311 2589 struct mro_meta* stash_meta;
32251b26 2590
bfcb3514 2591 if (!stash || !HvNAME_get(stash))
601f1833 2592 return NULL;
e1a479c5 2593
9b439311
BB
2594 stash_meta = HvMROMETA(stash);
2595 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2596
ad64d0ec 2597 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ
2598 if (!mg) {
2599 do_update:
8c34e50d 2600 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2601 return NULL;
ad64d0ec 2602 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2603 }
a9fd4e40 2604 assert(mg);
32251b26 2605 amtp = (AMT*)mg->mg_ptr;
66978156 2606 if ( amtp->was_ok_sub != newgen )
32251b26 2607 goto do_update;
3ad83ce7 2608 if (AMT_AMAGIC(amtp)) {
b7787f18 2609 CV * const ret = amtp->table[id];
3ad83ce7
AMS
2610 if (ret && isGV(ret)) { /* Autoloading stab */
2611 /* Passing it through may have resulted in a warning
2612 "Inherited AUTOLOAD for a non-method deprecated", since
2613 our caller is going through a function call, not a method call.
2614 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2615 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS
2616
2617 if (gv && GvCV(gv))
2618 return GvCV(gv);
2619 }
2620 return ret;
2621 }
a0288114 2622
601f1833 2623 return NULL;
32251b26
IZ
2624}
2625
2626
6f1401dc
DM
2627/* Implement tryAMAGICun_MG macro.
2628 Do get magic, then see if the stack arg is overloaded and if so call it.
2629 Flags:
2630 AMGf_set return the arg using SETs rather than assigning to
2631 the targ
2632 AMGf_numeric apply sv_2num to the stack arg.
2633*/
2634
2635bool
2636Perl_try_amagic_un(pTHX_ int method, int flags) {
2637 dVAR;
2638 dSP;
2639 SV* tmpsv;
2640 SV* const arg = TOPs;
2641
2642 SvGETMAGIC(arg);
2643
9f8bf298
NC
2644 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2645 AMGf_noright | AMGf_unary))) {
6f1401dc
DM
2646 if (flags & AMGf_set) {
2647 SETs(tmpsv);
2648 }
2649 else {
2650 dTARGET;
2651 if (SvPADMY(TARG)) {
2652 sv_setsv(TARG, tmpsv);
2653 SETTARG;
2654 }
2655 else
2656 SETs(tmpsv);
2657 }
2658 PUTBACK;
2659 return TRUE;
2660 }
2661
2662 if ((flags & AMGf_numeric) && SvROK(arg))
2663 *sp = sv_2num(arg);
2664 return FALSE;
2665}
2666
2667
2668/* Implement tryAMAGICbin_MG macro.
2669 Do get magic, then see if the two stack args are overloaded and if so
2670 call it.
2671 Flags:
2672 AMGf_set return the arg using SETs rather than assigning to
2673 the targ
2674 AMGf_assign op may be called as mutator (eg +=)
2675 AMGf_numeric apply sv_2num to the stack arg.
2676*/
2677
2678bool
2679Perl_try_amagic_bin(pTHX_ int method, int flags) {
2680 dVAR;
2681 dSP;
2682 SV* const left = TOPm1s;
2683 SV* const right = TOPs;
2684
2685 SvGETMAGIC(left);
2686 if (left != right)
2687 SvGETMAGIC(right);
2688
2689 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2690 SV * const tmpsv = amagic_call(left, right, method,
2691 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2692 if (tmpsv) {
2693 if (flags & AMGf_set) {
2694 (void)POPs;
2695 SETs(tmpsv);
2696 }
2697 else {
2698 dATARGET;
2699 (void)POPs;
2700 if (opASSIGN || SvPADMY(TARG)) {
2701 sv_setsv(TARG, tmpsv);
2702 SETTARG;
2703 }
2704 else
2705 SETs(tmpsv);
2706 }
2707 PUTBACK;
2708 return TRUE;
2709 }
2710 }
75ea7a12
FC
2711 if(left==right && SvGMAGICAL(left)) {
2712 SV * const left = sv_newmortal();
2713 *(sp-1) = left;
2714 /* Print the uninitialized warning now, so it includes the vari-
2715 able name. */
2716 if (!SvOK(right)) {
2717 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2718 sv_setsv_flags(left, &PL_sv_no, 0);
2719 }
2720 else sv_setsv_flags(left, right, 0);
2721 SvGETMAGIC(right);
2722 }
6f1401dc 2723 if (flags & AMGf_numeric) {
75ea7a12
FC
2724 if (SvROK(TOPm1s))
2725 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM
2726 if (SvROK(right))
2727 *sp = sv_2num(right);
2728 }
2729 return FALSE;
2730}
2731
25a9ffce
NC
2732SV *
2733Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2734 SV *tmpsv = NULL;
2735
2736 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2737
2738 while (SvAMAGIC(ref) &&
2739 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2740 AMGf_noright | AMGf_unary))) {
2741 if (!SvROK(tmpsv))
2742 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2743 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2744 /* Bail out if it returns us the same reference. */
2745 return tmpsv;
2746 }
2747 ref = tmpsv;
2748 }
2749 return tmpsv ? tmpsv : ref;
2750}
6f1401dc 2751
8d569291
FC
2752bool
2753Perl_amagic_is_enabled(pTHX_ int method)
2754{
2755 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2756
2757 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2758
2759 if ( !lex_mask || !SvOK(lex_mask) )
2760 /* overloading lexically disabled */
2761 return FALSE;
2762 else if ( lex_mask && SvPOK(lex_mask) ) {
2763 /* we have an entry in the hints hash, check if method has been
2764 * masked by overloading.pm */
2765 STRLEN len;
2766 const int offset = method / 8;
2767 const int bit = method % 8;
2768 char *pv = SvPV(lex_mask, len);
2769
2770 /* Bit set, so this overloading operator is disabled */
2771 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2772 return FALSE;
2773 }
2774 return TRUE;
2775}
2776
a0d0e21e 2777SV*
864dbfa3 2778Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2779{
27da23d5 2780 dVAR;
b267980d 2781 MAGIC *mg;
9c5ffd7c 2782 CV *cv=NULL;
a0d0e21e 2783 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2784 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL
2785 int off = 0, off1, lr = 0, notfound = 0;
2786 int postpr = 0, force_cpy = 0;
2787 int assign = AMGf_assign & flags;
2788 const int assignshift = assign ? 1 : 0;
bf5522a1 2789 int use_default_op = 0;
67288365 2790 int force_scalar = 0;
497b47a8
JH
2791#ifdef DEBUGGING
2792 int fl=0;
497b47a8 2793#endif
25716404 2794 HV* stash=NULL;
7918f24d
NC
2795
2796 PERL_ARGS_ASSERT_AMAGIC_CALL;
2797
e46c382e 2798 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2799 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK
2800 }
2801
a0d0e21e 2802 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2803 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2804 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2805 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2806 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2807 : NULL))
b267980d 2808 && ((cv = cvp[off=method+assignshift])
748a9306
LW
2809 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2810 * usual method */
497b47a8
JH
2811 (
2812#ifdef DEBUGGING
2813 fl = 1,
a0288114 2814#endif
497b47a8 2815 cv = cvp[off=method])))) {
a0d0e21e
LW
2816 lr = -1; /* Call method for left argument */
2817 } else {
2818 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2819 int logic;
2820
2821 /* look for substituted methods */
ee239bfe 2822 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW
2823 switch (method) {
2824 case inc_amg:
ee239bfe
IZ
2825 force_cpy = 1;
2826 if ((cv = cvp[off=add_ass_amg])
2827 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2828 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2829 }
2830 break;
2831 case dec_amg:
ee239bfe
IZ
2832 force_cpy = 1;
2833 if ((cv = cvp[off = subtr_ass_amg])
2834 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2835 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW
2836 }
2837 break;
2838 case bool__amg:
2839 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2840 break;
2841 case numer_amg:
2842 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2843 break;
2844 case string_amg:
2845 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2846 break;
b7787f18
AL
2847 case not_amg:
2848 (void)((cv = cvp[off=bool__amg])
2849 || (cv = cvp[off=numer_amg])
2850 || (cv = cvp[off=string_amg]));
2ab54efd
MB
2851 if (cv)
2852 postpr = 1;
b7787f18 2853 break;
748a9306
LW
2854 case copy_amg:
2855 {
76e3520e
GS
2856 /*
2857 * SV* ref causes confusion with the interpreter variable of
2858 * the same name
2859 */
890ce7af 2860 SV* const tmpRef=SvRV(left);
76e3520e 2861 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e
PP
2862 /*
2863 * Just to be extra cautious. Maybe in some
2864 * additional cases sv_setsv is safe, too.
2865 */
890ce7af 2866 SV* const newref = newSVsv(tmpRef);
748a9306 2867 SvOBJECT_on(newref);
a1cd65be
FC
2868 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2869 delegate to the stash. */
85fbaab2 2870 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW
2871 return newref;
2872 }
2873 }
2874 break;
a0d0e21e 2875 case abs_amg:
b267980d 2876 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2877 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2878 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2879 if (off1==lt_amg) {
890ce7af 2880 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2881 lt_amg,AMGf_noright);
2882 logic = SvTRUE(lessp);
2883 } else {
890ce7af 2884 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW
2885 ncmp_amg,AMGf_noright);
2886 logic = (SvNV(lessp) < 0);
2887 }
2888 if (logic) {
2889 if (off==subtr_amg) {
2890 right = left;
748a9306 2891 left = nullsv;
a0d0e21e
LW
2892 lr = 1;
2893 }
2894 } else {
2895 return left;
2896 }
2897 }
2898 break;
2899 case neg_amg:
155aba94 2900 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW
2901 right = left;
2902 left = sv_2mortal(newSViv(0));
2903 lr = 1;
2904 }
2905 break;
f216259d 2906 case int_amg:
f5284f61 2907 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2908 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2909 case regexp_amg:
b267980d
NIS
2910 /* FAIL safe */
2911 return NULL; /* Delegate operation to standard mechanisms. */
2912 break;
f5284f61
IZ
2913 case to_sv_amg:
2914 case to_av_amg:
2915 case to_hv_amg:
2916 case to_gv_amg:
2917 case to_cv_amg:
2918 /* FAIL safe */
b267980d 2919 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2920 break;
a0d0e21e
LW
2921 default:
2922 goto not_found;
2923 }
2924 if (!cv) goto not_found;
2925 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2926 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2927 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2928 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2929 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2930 : NULL))
69815d08
RS
2931 && (cv = cvp[off=method])) { /* Method for right
2932 * argument found */
2933 lr=1;
bf5522a1
MB
2934 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2935 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW
2936 && !(flags & AMGf_unary)) {
2937 /* We look for substitution for
2938 * comparison operations and
fc36a67e 2939 * concatenation */
a0d0e21e
LW
2940 if (method==concat_amg || method==concat_ass_amg
2941 || method==repeat_amg || method==repeat_ass_amg) {
2942 return NULL; /* Delegate operation to string conversion */
2943 }
2944 off = -1;
2945 switch (method) {
2946 case lt_amg:
2947 case le_amg:
2948 case gt_amg:
2949 case ge_amg:
2950 case eq_amg:
2951 case ne_amg:
2ab54efd
MB
2952 off = ncmp_amg;
2953 break;
a0d0e21e
LW
2954 case slt_amg:
2955 case sle_amg:
2956 case sgt_amg:
2957 case sge_amg:
2958 case seq_amg:
2959 case sne_amg:
2ab54efd
MB
2960 off = scmp_amg;
2961 break;
a0d0e21e 2962 }
bf5522a1
MB
2963 if (off != -1) {
2964 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2965 cv = ocvp[off];
2966 lr = -1;
2967 }
2968 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2969 cv = cvp[off];
2970 lr = 1;
2971 }
2972 }
2973 if (cv)
2ab54efd
MB
2974 postpr = 1;
2975 else
2976 goto not_found;
a0d0e21e 2977 } else {
a6006777 2978 not_found: /* No method found, either report or croak */
b267980d
NIS
2979 switch (method) {
2980 case to_sv_amg:
2981 case to_av_amg:
2982 case to_hv_amg:
2983 case to_gv_amg:
2984 case to_cv_amg:
2985 /* FAIL safe */
2986 return left; /* Delegate operation to standard mechanisms. */
2987 break;
2988 }
a0d0e21e
LW
2989 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2990 notfound = 1; lr = -1;
2991 } else if (cvp && (cv=cvp[nomethod_amg])) {
2992 notfound = 1; lr = 1;
bf5522a1
MB
2993 } else if ((use_default_op =
2994 (!ocvp || oamtp->fallback >= AMGfallYES)
2995 && (!cvp || amtp->fallback >= AMGfallYES))
2996 && !DEBUG_o_TEST) {
4cc0ca18
NC
2997 /* Skip generating the "no method found" message. */
2998 return NULL;
a0d0e21e 2999 } else {
46fc3d4c 3000 SV *msg;
774d564b 3001 if (off==-1) off=method;
b267980d 3002 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF
3003 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3004 AMG_id2name(method + assignshift),
3005 (flags & AMGf_unary ? " " : "\n\tleft "),
3006 SvAMAGIC(left)?
3007 "in overloaded package ":
3008 "has no overloaded magic",
3009 SvAMAGIC(left)?
3010 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3011 SVfARG(&PL_sv_no),
3012 SvAMAGIC(right)?
3013 ",\n\tright argument in overloaded package ":
3014 (flags & AMGf_unary
3015 ? ""
3016 : ",\n\tright argument has no overloaded magic"),
3017 SvAMAGIC(right)?
3018 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3019 SVfARG(&PL_sv_no)));
bf5522a1 3020 if (use_default_op) {
d66cca07 3021 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3022 } else {
be2597df 3023 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW
3024 }
3025 return NULL;
3026 }
ee239bfe 3027 force_cpy = force_cpy || assign;
a0d0e21e
LW
3028 }
3029 }
67288365
JL
3030
3031 switch (method) {
3032 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3033 * operation. we need this to return a value, so that it can be assigned
3034 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3035 * increment or decrement was itself called in void context */
3036 case inc_amg:
3037 if (off == add_amg)
3038 force_scalar = 1;
3039 break;
3040 case dec_amg:
3041 if (off == subtr_amg)
3042 force_scalar = 1;
3043 break;
3044 /* in these cases, we're calling an assignment variant of an operator
3045 * (+= rather than +, for instance). regardless of whether it's a
3046 * fallback or not, it always has to return a value, which will be
3047 * assigned to the proper variable later */
3048 case add_amg:
3049 case subtr_amg:
3050 case mult_amg:
3051 case div_amg:
3052 case modulo_amg:
3053 case pow_amg:
3054 case lshift_amg:
3055 case rshift_amg:
3056 case repeat_amg:
3057 case concat_amg:
3058 case band_amg:
3059 case bor_amg:
3060 case bxor_amg:
3061 if (assign)
3062 force_scalar = 1;
3063 break;
3064 /* the copy constructor always needs to return a value */
3065 case copy_amg:
3066 force_scalar = 1;
3067 break;
3068 /* because of the way these are implemented (they don't perform the
3069 * dereferencing themselves, they return a reference that perl then
3070 * dereferences later), they always have to be in scalar context */
3071 case to_sv_amg:
3072 case to_av_amg:
3073 case to_hv_amg:
3074 case to_gv_amg:
3075 case to_cv_amg:
3076 force_scalar = 1;
3077 break;
3078 /* these don't have an op of their own; they're triggered by their parent
3079 * op, so the context there isn't meaningful ('$a and foo()' in void
3080 * context still needs to pass scalar context on to $a's bool overload) */
3081 case bool__amg:
3082 case numer_amg:
3083 case string_amg:
3084 force_scalar = 1;
3085 break;
3086 }
3087
497b47a8 3088#ifdef DEBUGGING
a0d0e21e 3089 if (!notfound) {
497b47a8 3090 DEBUG_o(Perl_deb(aTHX_
d66cca07 3091 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH
3092 AMG_id2name(off),
3093 method+assignshift==off? "" :
a0288114 3094 " (initially \"",
497b47a8
JH
3095 method+assignshift==off? "" :
3096 AMG_id2name(method+assignshift),
a0288114 3097 method+assignshift==off? "" : "\")",
497b47a8
JH
3098 flags & AMGf_unary? "" :
3099 lr==1 ? " for right argument": " for left argument",
3100 flags & AMGf_unary? " for argument" : "",
d66cca07 3101 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3102 fl? ",\n\tassignment variant used": "") );
ee239bfe 3103 }
497b47a8 3104#endif
748a9306
LW
3105 /* Since we use shallow copy during assignment, we need
3106 * to dublicate the contents, probably calling user-supplied
3107 * version of copy operator
3108 */
ee239bfe
IZ
3109 /* We need to copy in following cases:
3110 * a) Assignment form was called.
3111 * assignshift==1, assign==T, method + 1 == off
3112 * b) Increment or decrement, called directly.
3113 * assignshift==0, assign==0, method + 0 == off
3114 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3115 * assignshift==0, assign==T,
ee239bfe
IZ
3116 * force_cpy == T
3117 * d) Increment or decrement, translated to nomethod.
b267980d 3118 * assignshift==0, assign==0,
ee239bfe
IZ
3119 * force_cpy == T
3120 * e) Assignment form translated to nomethod.
3121 * assignshift==1, assign==T, method + 1 != off
3122 * force_cpy == T
3123 */
3124 /* off is method, method+assignshift, or a result of opcode substitution.
3125 * In the latter case assignshift==0, so only notfound case is important.
3126 */
73512201 3127 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3128 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3129 || force_cpy) )
6f1401dc 3130 {
1b38c28e
NC
3131 /* newSVsv does not behave as advertised, so we copy missing
3132 * information by hand */
3133 SV *tmpRef = SvRV(left);
3134 SV *rv_copy;
31d632c3 3135 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC
3136 SvRV_set(left, rv_copy);
3137 SvSETMAGIC(left);
e7881358 3138 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3139 }
6f1401dc
DM
3140 }
3141
a0d0e21e
LW
3142 {
3143 dSP;
3144 BINOP myop;
3145 SV* res;
b7787f18 3146 const bool oldcatch = CATCH_GET;
67288365
JL
3147 I32 oldmark, nret;
3148 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3149
54310121 3150 CATCH_SET(TRUE);
a0d0e21e
LW
3151 Zero(&myop, 1, BINOP);
3152 myop.op_last = (OP *) &myop;
b37c2d43 3153 myop.op_next = NULL;
67288365
JL
3154 myop.op_flags = OPf_STACKED;
3155
3156 switch (gimme) {
3157 case G_VOID:
3158 myop.op_flags |= OPf_WANT_VOID;
3159 break;
3160 case G_ARRAY:
3161 if (flags & AMGf_want_list) {
3162 myop.op_flags |= OPf_WANT_LIST;
3163 break;
3164 }
3165 /* FALLTHROUGH */
3166 default:
3167 myop.op_flags |= OPf_WANT_SCALAR;
3168 break;
3169 }
a0d0e21e 3170
e788e7d3 3171 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3172 ENTER;
462e5cf6 3173 SAVEOP();
533c011a 3174 PL_op = (OP *) &myop;
3280af22 3175 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3176 PL_op->op_private |= OPpENTERSUB_DB;
a0d0e21e 3177 PUTBACK;
897d3989 3178 Perl_pp_pushmark(aTHX);
a0d0e21e 3179
924508f0 3180 EXTEND(SP, notfound + 5);
a0d0e21e
LW
3181 PUSHs(lr>0? right: left);
3182 PUSHs(lr>0? left: right);
3280af22 3183 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3184 if (notfound) {
59cd0e26
NC
3185 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3186 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3187 }
ad64d0ec 3188 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3189 PUTBACK;
67288365 3190 oldmark = TOPMARK;
a0d0e21e 3191
139d0ce6 3192 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3193 CALLRUNOPS(aTHX);
a0d0e21e
LW
3194 LEAVE;
3195 SPAGAIN;
67288365
JL
3196 nret = SP - (PL_stack_base + oldmark);
3197
3198 switch (gimme) {
3199 case G_VOID:
3200 /* returning NULL has another meaning, and we check the context
3201 * at the call site too, so this can be differentiated from the
3202 * scalar case */
3203 res = &PL_sv_undef;
3204 SP = PL_stack_base + oldmark;
3205 break;
3206 case G_ARRAY: {
3207 if (flags & AMGf_want_list) {
3208 res = sv_2mortal((SV *)newAV());
3209 av_extend((AV *)res, nret);
3210 while (nret--)
3211 av_store((AV *)res, nret, POPs);
3212 break;
3213 }
3214 /* FALLTHROUGH */
3215 }
3216 default:
3217 res = POPs;
3218 break;
3219 }
a0d0e21e 3220
ebafeae7 3221 PUTBACK;
d3acc0f7 3222 POPSTACK;
54310121 3223 CATCH_SET(oldcatch);
a0d0e21e 3224
a0d0e21e 3225 if (postpr) {
b7787f18 3226 int ans;
a0d0e21e
LW
3227 switch (method) {
3228 case le_amg:
3229 case sle_amg:
3230 ans=SvIV(res)<=0; break;
3231 case lt_amg:
3232 case slt_amg:
3233 ans=SvIV(res)<0; break;
3234 case ge_amg:
3235 case sge_amg:
3236 ans=SvIV(res)>=0; break;
3237 case gt_amg:
3238 case sgt_amg:
3239 ans=SvIV(res)>0; break;
3240 case eq_amg:
3241 case seq_amg:
3242 ans=SvIV(res)==0; break;
3243 case ne_amg:
3244 case sne_amg:
3245 ans=SvIV(res)!=0; break;
3246 case inc_amg:
3247 case dec_amg:
bbce6d69 3248 SvSetSV(left,res); return left;
dc437b57 3249 case not_amg:
fe7ac86a 3250 ans=!SvTRUE(res); break;
b7787f18
AL
3251 default:
3252 ans=0; break;
a0d0e21e 3253 }
54310121 3254 return boolSV(ans);
748a9306
LW
3255 } else if (method==copy_amg) {
3256 if (!SvROK(res)) {
cea2e8a9 3257 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW
3258 }
3259 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW
3260 } else {
3261 return res;
3262 }
3263 }
3264}
c9d5ac95 3265
f5c1e807
NC
3266void
3267Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3268{
3269 dVAR;
acda4c6a 3270 U32 hash;
f5c1e807 3271
7918f24d 3272 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3273
acda4c6a
NC
3274 if (len > I32_MAX)
3275 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3276
ae8cc45f
NC
3277 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3278 unshare_hek(GvNAME_HEK(gv));
3279 }
3280
acda4c6a 3281 PERL_HASH(hash, name, len);
c60dbbc3 3282 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC
3283}
3284
66610fdd 3285/*
f7461760
Z
3286=for apidoc gv_try_downgrade
3287
2867cdbc
Z
3288If the typeglob C<gv> can be expressed more succinctly, by having
3289something other than a real GV in its place in the stash, replace it
3290with the optimised form. Basic requirements for this are that C<gv>
3291is a real typeglob, is sufficiently ordinary, and is only referenced
3292from its package. This function is meant to be used when a GV has been
3293looked up in part to see what was there, causing upgrading, but based
3294on what was found it turns out that the real GV isn't required after all.
3295
3296If C<gv> is a completely empty typeglob, it is deleted from the stash.
3297
3298If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3299sub, the typeglob is replaced with a scalar-reference placeholder that
3300more compactly represents the same thing.
f7461760
Z
3301
3302=cut
3303*/
3304
3305void
3306Perl_gv_try_downgrade(pTHX_ GV *gv)
3307{
3308 HV *stash;
3309 CV *cv;
3310 HEK *namehek;
3311 SV **gvp;
3312 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC
3313
3314 /* XXX Why and where does this leave dangling pointers during global
3315 destruction? */
627364f1 3316 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3317
2867cdbc 3318 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3319 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3320 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3321 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3322 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3323 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3324 return;
af230ad6 3325 if (gv == PL_statgv) return;
803f2748
DM
3326 if (SvMAGICAL(gv)) {
3327 MAGIC *mg;
3328 /* only backref magic is allowed */
3329 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3330 return;
3331 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3332 if (mg->mg_type != PERL_MAGIC_backref)
3333 return;
3334 }
3335 }
2867cdbc
Z
3336 cv = GvCV(gv);
3337 if (!cv) {
3338 HEK *gvnhek = GvNAME_HEK(gv);
3339 (void)hv_delete(stash, HEK_KEY(gvnhek),
3340 HEK_UTF8(gvnhek) ? -HEK_LEN(gvnhek) : HEK_LEN(gvnhek), G_DISCARD);
3341 } else if (GvMULTI(gv) && cv &&
f7461760
Z
3342 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3343 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3344 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3345 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3346 (namehek = GvNAME_HEK(gv)) &&
3347 (gvp = hv_fetch(stash, HEK_KEY(namehek),
3348 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
3349 *gvp == (SV*)gv) {
3350 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3351 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z
3352 SvREFCNT(gv) = 0;
3353 sv_clear((SV*)gv);
3354 SvREFCNT(gv) = 1;
70e5f2b5 3355 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z
3356 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3357 STRUCT_OFFSET(XPVIV, xiv_iv));
3358 SvRV_set(gv, value);
3359 }
3360}
3361
4aaa4757
FC
3362#include "XSUB.h"
3363
3364static void
3365core_xsub(pTHX_ CV* cv)
3366{
3367 Perl_croak(aTHX_
3368 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3369 );
3370}
3371
f7461760 3372/*
66610fdd
RGS
3373 * Local variables:
3374 * c-indentation-style: bsd
3375 * c-basic-offset: 4
14d04a33 3376 * indent-tabs-mode: nil
66610fdd
RGS
3377 * End:
3378 *
14d04a33 3379 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3380 */