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O_BINARY versus O_TEXT.
[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW		 14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW		 20 */
21
ccfc67b7
JH		 22/*
23=head1 GV Functions
166f8a29
DM		 24
25A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
26It is a structure that holds a pointer to a scalar, an array, a hash etc,
27corresponding to $foo, @foo, %foo.
28
29GVs are usually found as values in stashes (symbol table hashes) where
30Perl stores its global variables.
31
32=cut
ccfc67b7
JH		 33*/
34
79072805 35#include "EXTERN.h"
864dbfa3 36#define PERL_IN_GV_C
79072805 37#include "perl.h"
8261f8eb 38#include "overload.c"
4aaa4757 39#include "keywords.h"
2846acbf 40#include "feature.h"
79072805 41
f54cb97a
AL		 42static const char S_autoload[] = "AUTOLOAD";
43static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 44
c69033f2 45GV *
d5713896 46Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 47{
d5713896 48 SV **where;
7918f24d 49
13be902c
FC		 50 if (
51 !gv
52 || (
53 SvTYPE((const SV *)gv) != SVt_PVGV
54 && SvTYPE((const SV *)gv) != SVt_PVLV
55 )
56 ) {
bb85b28a
NC		 57 const char *what;
58 if (type == SVt_PVIO) {
59 /*
60 * if it walks like a dirhandle, then let's assume that
61 * this is a dirhandle.
62 */
332c2eac 63 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 64 "dirhandle" : "filehandle";
bb85b28a
NC		 65 } else if (type == SVt_PVHV) {
66 what = "hash";
67 } else {
68 what = type == SVt_PVAV ? "array" : "scalar";
69 }
de6f7947 70 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 71 Perl_croak(aTHX_ "Bad symbol for %s", what);
72 }
d5713896
NC		 73
74 if (type == SVt_PVHV) {
75 where = (SV **)&GvHV(gv);
76 } else if (type == SVt_PVAV) {
77 where = (SV **)&GvAV(gv);
bb85b28a
NC		 78 } else if (type == SVt_PVIO) {
79 where = (SV **)&GvIOp(gv);
d5713896
NC		 80 } else {
81 where = &GvSV(gv);
82 }
7918f24d 83
d5713896 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 134 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
43e4250a 135 hv_magic(GvHVn(gv), GvAVn(gv), 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));
c67159e1 356 break;
42d0e0b7 357 default: NOOP;
5c1f4d79 358 }
756cb477
NC		 359 SvRV_set(gv, NULL);
360 SvROK_off(gv);
361 }
463ee0b2 362
3b6733bf
NC		 363
364 if (old_type < SVt_PVGV) {
365 if (old_type >= SVt_PV)
366 SvCUR_set(gv, 0);
ad64d0ec 367 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 368 }
55d729e4
GS		 369 if (SvLEN(gv)) {
370 if (proto) {
f880fe2f 371 SvPV_set(gv, NULL);
b162af07 372 SvLEN_set(gv, 0);
55d729e4
GS		 373 SvPOK_off(gv);
374 } else
94010e71 375 Safefree(SvPVX_mutable(gv));
55d729e4 376 }
2e5b91de
NC		 377 SvIOK_off(gv);
378 isGV_with_GP_on(gv);
12816592 379
c43ae56f 380 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 381 GvSTASH(gv) = stash;
382 if (stash)
ad64d0ec 383 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 384 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 385 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
386 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 387 if (doproto) {
e3d2b9e7 388 CV *cv;
756cb477
NC		 389 if (has_constant) {
390 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 391 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 392 /* In case op.c:S_process_special_blocks stole it: */
393 if (!GvCV(gv))
c43ae56f 394 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 395 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 396 /* If this reference was a copy of another, then the subroutine
397 must have been "imported", by a Perl space assignment to a GV
398 from a reference to CV. */
399 if (exported_constant)
400 GvIMPORTED_CV_on(gv);
186a5ba8 401 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 402 } else {
186a5ba8 403 cv = newSTUB(gv,1);
756cb477 404 }
55d729e4 405 if (proto) {
e3d2b9e7 406 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 407 SV_HAS_TRAILING_NUL);
e0260a5b 408 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 409 }
410 }
463ee0b2
LW		 411}
412
76e3520e 413STATIC void
e6066781 414S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 415{
e6066781 416 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 417
a0d0e21e
LW		 418 switch (sv_type) {
419 case SVt_PVIO:
420 (void)GvIOn(gv);
421 break;
422 case SVt_PVAV:
423 (void)GvAVn(gv);
424 break;
425 case SVt_PVHV:
426 (void)GvHVn(gv);
427 break;
c69033f2
NC		 428#ifdef PERL_DONT_CREATE_GVSV
429 case SVt_NULL:
430 case SVt_PVCV:
431 case SVt_PVFM:
e654831b 432 case SVt_PVGV:
c69033f2
NC		 433 break;
434 default:
dbdce04c
NC		 435 if(GvSVn(gv)) {
436 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
437 If we just cast GvSVn(gv) to void, it ignores evaluating it for
438 its side effect */
439 }
c69033f2 440#endif
a0d0e21e
LW		 441 }
442}
443
0f8d4b5e
FC		 444static void core_xsub(pTHX_ CV* cv);
445
446static GV *
447S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 448 const char * const name, const STRLEN len)
0f8d4b5e
FC		 449{
450 const int code = keyword(name, len, 1);
451 static const char file[] = __FILE__;
97021f77 452 CV *cv, *oldcompcv = NULL;
0f8d4b5e 453 int opnum = 0;
0f8d4b5e 454 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 455 COP *oldcurcop = NULL;
456 yy_parser *oldparser = NULL;
457 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 458
459 assert(gv || stash);
460 assert(name);
0f8d4b5e 461
88b892d8
FC		 462 if (!code) return NULL; /* Not a keyword */
463 switch (code < 0 ? -code : code) {
0f8d4b5e 464 /* no support for \&CORE::infix;
d885f758 465 no support for funcs that do not parse like funcs */
88b892d8 466 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 467 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 468 case KEY_default : case KEY_DESTROY:
88b892d8 469 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 470 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 471 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 472 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 473 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
474 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
475 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 476 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 477 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 478 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 479 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 480 case KEY_state: case KEY_sub :
46bef06f 481 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 482 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
483 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 484 return NULL;
485 case KEY_chdir:
eb31eb35 486 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 487 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 488 case KEY_keys:
489 case KEY_lstat:
490 case KEY_pop:
491 case KEY_push:
492 case KEY_shift:
a99f2ca2 493 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 494 case KEY_stat:
495 case KEY_system:
496 case KEY_truncate: case KEY_unlink:
497 case KEY_unshift:
498 case KEY_values:
499 ampable = FALSE;
500 }
501 if (!gv) {
502 gv = (GV *)newSV(0);
503 gv_init(gv, stash, name, len, TRUE);
504 }
7e68c38b 505 GvMULTI_on(gv);
0f8d4b5e
FC		 506 if (ampable) {
507 ENTER;
508 oldcurcop = PL_curcop;
509 oldparser = PL_parser;
510 lex_start(NULL, NULL, 0);
511 oldcompcv = PL_compcv;
512 PL_compcv = NULL; /* Prevent start_subparse from setting
513 CvOUTSIDE. */
514 oldsavestack_ix = start_subparse(FALSE,0);
515 cv = PL_compcv;
516 }
517 else {
518 /* Avoid calling newXS, as it calls us, and things start to
519 get hairy. */
520 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
521 GvCV_set(gv,cv);
522 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 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 */
e8f91c91 544 if ((cv = newATTRSUB_x(
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 552 ),
e8f91c91 553 TRUE
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 904
cec2d7b1
FC		 905These functions grant C<"SUPER"> token
906as a prefix of the method name. Note
954c1994
GS		 907that if you want to keep the returned glob for a long time, you need to
908check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC		 909different subroutine due to $AUTOLOAD changing its value. Use the glob
910created as a side effect to do this.
954c1994 911
cec2d7b1
FC		 912These functions have the same side-effects as C<gv_fetchmeth> with
913C<level==0>. The warning against passing the GV returned by
914C<gv_fetchmeth> to C<call_sv> applies 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
8bfda0d7 1060 if (CvANON(cv) || !CvGV(cv))
09280a33
CS		 1061 stubgv = gv;
1062 else {
1063 stubgv = CvGV(cv);
1064 if (GvCV(stubgv) != cv) /* orphaned import */
1065 stubgv = gv;
1066 }
c8416c26
BF		 1067 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1068 GvNAME(stubgv), GvNAMELEN(stubgv),
1069 GV_AUTOLOAD_ISMETHOD
1070 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1071 if (autogv)
1072 gv = autogv;
1073 }
1074 }
44a8e56a 1075
1076 return gv;
1077}
1078
1079GV*
0eeb01b9 1080Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1081{
1082 char *namepv;
1083 STRLEN namelen;
0fe84f7c 1084 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1085 namepv = SvPV(namesv, namelen);
1086 if (SvUTF8(namesv))
1087 flags |= SVf_UTF8;
0eeb01b9 1088 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1089}
1090
1091GV*
0eeb01b9 1092Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1093{
0fe84f7c 1094 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1095 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1096}
1097
1098GV*
0eeb01b9 1099Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1100{
27da23d5 1101 dVAR;
44a8e56a 1102 GV* gv;
1103 CV* cv;
1104 HV* varstash;
1105 GV* vargv;
1106 SV* varsv;
c8416c26
BF		 1107 SV *packname = NULL;
1108 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1109
0fe84f7c 1110 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1111
7edbdc6b 1112 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1113 return NULL;
0dae17bd
GS		 1114 if (stash) {
1115 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1116 STRLEN packname_len = 0;
1117 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1118 packname = newSVpvn_flags(packname_ptr, packname_len,
1119 SVs_TEMP | SvUTF8(stash));
5c284bb0 1120 stash = NULL;
0dae17bd 1121 }
c8416c26
BF		 1122 else
1123 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1124 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1125 }
257dc59d
FC		 1126 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1127 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1128 return NULL;
dc848c6f 1129 cv = GvCV(gv);
1130
adb5a9ae 1131 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1132 return NULL;
ed850460 1133
dc848c6f 1134 /*
1135 * Inheriting AUTOLOAD for non-methods works ... for now.
1136 */
0eeb01b9
FC		 1137 if (
1138 !(flags & GV_AUTOLOAD_ISMETHOD)
1139 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1140 )
d1d15184 1141 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1142 "Use of inherited AUTOLOAD for non-method %"SVf
1143 "::%"UTF8f"() is deprecated",
ecad31f0 1144 SVfARG(packname),
b17a0679 1145 UTF8fARG(is_utf8, len, name));
44a8e56a 1146
aed2304a 1147 if (CvISXSUB(cv)) {
bb619f37
FC		 1148 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1149 * and split that value on the last '::', pass along the same data
1150 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1151 *
1152 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1153 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1154 * type. Since SvPVX has been documented as returning the sub name
1155 * for a long time, but not as returning the prototype, we have
1156 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1157 * elsewhere.
1158 *
1159 * We put the prototype in the same allocated buffer, but after
1160 * the sub name. The SvPOK flag indicates the presence of a proto-
1161 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1162 * If both flags are on, then SvLEN is used to indicate the end of
1163 * the prototype (artificially lower than what is actually allo-
1164 * cated), at the risk of having to reallocate a few bytes unneces-
1165 * sarily--but that should happen very rarely, if ever.
1166 *
1167 * We use SvUTF8 for both prototypes and sub names, so if one is
1168 * UTF8, the other must be upgraded.
adb5a9ae 1169 */
c68d9564 1170 CvSTASH_set(cv, stash);
8fa6a409 1171 if (SvPOK(cv)) { /* Ouch! */
e7881358 1172 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1173 STRLEN ulen;
1174 const char *proto = CvPROTO(cv);
1175 assert(proto);
1176 if (SvUTF8(cv))
1177 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1178 ulen = SvCUR(tmpsv);
1179 SvCUR(tmpsv)++; /* include null in string */
1180 sv_catpvn_flags(
1181 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1182 );
1183 SvTEMP_on(tmpsv); /* Allow theft */
1184 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1185 SvTEMP_off(tmpsv);
e7881358 1186 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1187 SvLEN(cv) = SvCUR(cv) + 1;
1188 SvCUR(cv) = ulen;
1189 }
1190 else {
1191 sv_setpvn((SV *)cv, name, len);
1192 SvPOK_off(cv);
1193 if (is_utf8)
c8416c26 1194 SvUTF8_on(cv);
8fa6a409
FC		 1195 else SvUTF8_off(cv);
1196 }
1197 CvAUTOLOAD_on(cv);
adb5a9ae 1198 }
adb5a9ae 1199
44a8e56a 1200 /*
1201 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1202 * The subroutine's original name may not be "AUTOLOAD", so we don't
1203 * use that, but for lack of anything better we will use the sub's
1204 * original package to look up $AUTOLOAD.
1205 */
1206 varstash = GvSTASH(CvGV(cv));
5c7983e5 1207 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1208 ENTER;
1209
c69033f2 1210 if (!isGV(vargv)) {
04ec7e59 1211 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1212#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1213 GvSV(vargv) = newSV(0);
c69033f2
NC		 1214#endif
1215 }
3d35f11b 1216 LEAVE;
e203899d 1217 varsv = GvSVn(vargv);
4bac9ae4
CS		 1218 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1219 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1220 sv_setsv(varsv, packname);
396482e1 1221 sv_catpvs(varsv, "::");
d40bf27b
NC		 1222 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1223 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1224 sv_catpvn_flags(
1225 varsv, name, len,
5bcd1ef4 1226 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1227 );
c8416c26
BF		 1228 if (is_utf8)
1229 SvUTF8_on(varsv);
a0d0e21e
LW		 1230 return gv;
1231}
1232
44a2ac75
YO		 1233
1234/* require_tie_mod() internal routine for requiring a module
486ec47a 1235 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1236 *
1237 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1238 * "varpv" holds the name of the var, used for error messages.
1239 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1240 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1241 * are working reasonably close to as expected.
1242 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1243 * For the protection of $! to work (it is set by this routine)
1244 * the sv slot must already be magicalized.
d2c93421 1245 */
44a2ac75
YO		 1246STATIC HV*
1247S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1248{
27da23d5 1249 dVAR;
da51bb9b 1250 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1251
7918f24d
NC		 1252 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1253
0ea03996 1254 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1255 SV *module = newSVsv(namesv);
1256 char varname = *varpv; /* varpv might be clobbered by load_module,
1257 so save it. For the moment it's always
1258 a single char. */
b82b06b8 1259 const char type = varname == '[' ? '$' : '%';
61bac25c 1260#ifdef DEBUGGING
d2c93421 1261 dSP;
61bac25c 1262#endif
d2c93421 1263 ENTER;
600beb2e 1264 SAVEFREESV(namesv);
44a2ac75 1265 if ( flags & 1 )
45cbc99a
RGS		 1266 save_scalar(gv);
1267 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1268 assert(sp == PL_stack_sp);
da51bb9b 1269 stash = gv_stashsv(namesv, 0);
44a2ac75 1270 if (!stash)
b82b06b8
FC		 1271 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1272 type, varname, SVfARG(namesv));
45cbc99a 1273 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1274 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1275 type, varname, SVfARG(namesv), methpv);
600beb2e 1276 LEAVE;
d2c93421 1277 }
e7881358 1278 else SvREFCNT_dec_NN(namesv);
44a2ac75 1279 return stash;
d2c93421
RH		 1280}
1281
954c1994
GS		 1282/*
1283=for apidoc gv_stashpv
1284
da51bb9b 1285Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1286determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1287
1288=cut
1289*/
1290
a0d0e21e 1291HV*
864dbfa3 1292Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1293{
7918f24d 1294 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1295 return gv_stashpvn(name, strlen(name), create);
1296}
1297
bc96cb06
SH		 1298/*
1299=for apidoc gv_stashpvn
1300
da51bb9b
NC		 1301Returns a pointer to the stash for a specified package. The C<namelen>
1302parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1303to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1304created if it does not already exist. If the package does not exist and
1305C<flags> is 0 (or any other setting that does not create packages) then NULL
1306is returned.
1307
566a4718
YO		 1308Flags may be one of:
1309
1310 GV_ADD
1311 SVf_UTF8
1312 GV_NOADD_NOINIT
1313 GV_NOINIT
1314 GV_NOEXPAND
1315 GV_ADDMG
1316
1317The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH		 1318
1319=cut
1320*/
1321
dc437b57 1322HV*
da51bb9b 1323Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1324{
0cea0058 1325 char smallbuf[128];
46fc3d4c 1326 char *tmpbuf;
a0d0e21e
LW		 1327 HV *stash;
1328 GV *tmpgv;
add0ecde 1329 U32 tmplen = namelen + 2;
dc437b57 1330
7918f24d
NC		 1331 PERL_ARGS_ASSERT_GV_STASHPVN;
1332
add0ecde 1333 if (tmplen <= sizeof smallbuf)
46fc3d4c 1334 tmpbuf = smallbuf;
1335 else
add0ecde
VP		 1336 Newx(tmpbuf, tmplen, char);
1337 Copy(name, tmpbuf, namelen, char);
1338 tmpbuf[namelen] = ':';
1339 tmpbuf[namelen+1] = ':';
1340 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1341 if (tmpbuf != smallbuf)
1342 Safefree(tmpbuf);
a0d0e21e 1343 if (!tmpgv)
da51bb9b 1344 return NULL;
a0d0e21e 1345 stash = GvHV(tmpgv);
1f656fcf 1346 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1347 assert(stash);
1f656fcf 1348 if (!HvNAME_get(stash)) {
0be4d16f 1349 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1350
1351 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1352 /* If the containing stash has multiple effective
1353 names, see that this one gets them, too. */
1354 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1355 mro_package_moved(stash, NULL, tmpgv, 1);
1356 }
a0d0e21e 1357 return stash;
463ee0b2
LW		 1358}
1359
954c1994
GS		 1360/*
1361=for apidoc gv_stashsv
1362
da51bb9b 1363Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS		 1364
1365=cut
1366*/
1367
a0d0e21e 1368HV*
da51bb9b 1369Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1370{
dc437b57 1371 STRLEN len;
9d4ba2ae 1372 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC		 1373
1374 PERL_ARGS_ASSERT_GV_STASHSV;
1375
0be4d16f 1376 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW		 1377}
1378
1379
463ee0b2 1380GV *
fe9845cc 1381Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1382 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1383 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1384}
1385
1386GV *
fe9845cc 1387Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1388 STRLEN len;
77cb3b01
FC		 1389 const char * const nambeg =
1390 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1391 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1392 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1393}
1394
90aeefb4 1395PERL_STATIC_INLINE void
290a1700 1396S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1397{
1398 AV* av;
1399
1400 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1401
1402 av = GvAVn(gv);
1403 GvMULTI_on(gv);
1404 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1405 NULL, 0);
ad7cce9f
FR		 1406}
1407
90aeefb4
BF		 1408/* This function grabs name and tries to split a stash and glob
1409 * from its contents. TODO better description, comments
1410 *
1411 * If the function returns TRUE and 'name == name_end', then
1412 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1413 */
1414PERL_STATIC_INLINE bool
1415S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1416 STRLEN *len, const char *nambeg, STRLEN full_len,
1417 const U32 is_utf8, const I32 add)
1418{
1419 const char *name_cursor;
1420 const char *const name_end = nambeg + full_len;
1421 const char *const name_em1 = name_end - 1;
1422
1423 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1424
1425 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1426 /* accidental stringify on a GV? */
1427 (*name)++;
1428 }
1429
1430 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1431 if (name_cursor < name_em1 &&
1432 ((*name_cursor == ':' && name_cursor[1] == ':')
1433 || *name_cursor == '\''))
1434 {
1435 if (!*stash)
1436 *stash = PL_defstash;
1437 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1438 return FALSE;
1439
1440 *len = name_cursor - *name;
1441 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1442 const char *key;
1443 GV**gvp;
1444 if (*name_cursor == ':') {
1445 key = *name;
1446 *len += 2;
1447 }
1448 else {
1449 char *tmpbuf;
1450 Newx(tmpbuf, *len+2, char);
1451 Copy(*name, tmpbuf, *len, char);
1452 tmpbuf[(*len)++] = ':';
1453 tmpbuf[(*len)++] = ':';
1454 key = tmpbuf;
1455 }
c161da64 1456 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1457 *gv = gvp ? *gvp : NULL;
1458 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1459 if (SvTYPE(*gv) != SVt_PVGV)
1460 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1461 else
1462 GvMULTI_on(*gv);
1463 }
1464 if (key != *name)
1465 Safefree(key);
1466 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1467 return FALSE;
1468
1469 if (!(*stash = GvHV(*gv))) {
1470 *stash = GvHV(*gv) = newHV();
1471 if (!HvNAME_get(*stash)) {
1472 if (GvSTASH(*gv) == PL_defstash && *len == 6
1473 && strnEQ(*name, "CORE", 4))
1474 hv_name_set(*stash, "CORE", 4, 0);
1475 else
1476 hv_name_set(
1477 *stash, nambeg, name_cursor-nambeg, is_utf8
1478 );
1479 /* If the containing stash has multiple effective
1480 names, see that this one gets them, too. */
1481 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1482 mro_package_moved(*stash, NULL, *gv, 1);
1483 }
1484 }
1485 else if (!HvNAME_get(*stash))
1486 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1487 }
1488
1489 if (*name_cursor == ':')
1490 name_cursor++;
1491 *name = name_cursor+1;
1492 if (*name == name_end) {
1493 if (!*gv)
1494 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1495 return TRUE;
1496 }
1497 }
1498 }
1499 *len = name_cursor - *name;
1500 return TRUE;
1501}
1502
536d1a88 1503/* Checks if an unqualified name is in the main stash */
90aeefb4 1504PERL_STATIC_INLINE bool
536d1a88 1505S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1506{
536d1a88 1507 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1508
90aeefb4 1509 /* If it's an alphanumeric variable */
536d1a88 1510 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1511 /* Some "normal" variables are always in main::,
1512 * like INC or STDOUT.
1513 */
1514 switch (len) {
1515 case 1:
1516 if (*name == '_')
536d1a88 1517 return TRUE;
90aeefb4
BF		 1518 break;
1519 case 3:
1520 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1521 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1522 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1523 return TRUE;
90aeefb4
BF		 1524 break;
1525 case 4:
1526 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1527 && name[3] == 'V')
536d1a88 1528 return TRUE;
90aeefb4
BF		 1529 break;
1530 case 5:
1531 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1532 && name[3] == 'I' && name[4] == 'N')
536d1a88 1533 return TRUE;
90aeefb4
BF		 1534 break;
1535 case 6:
1536 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1537 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1538 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1539 return TRUE;
90aeefb4
BF		 1540 break;
1541 case 7:
1542 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1543 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1544 && name[6] == 'T')
536d1a88 1545 return TRUE;
90aeefb4
BF		 1546 break;
1547 }
536d1a88
BF		 1548 }
1549 /* *{""}, or a special variable like $@ */
1550 else
1551 return TRUE;
1552
1553 return FALSE;
1554}
1555
1556
1557/* This function is called if parse_gv_stash_name() failed to
1558 * find a stash, or if GV_NOTQUAL or an empty name was passed
1559 * to gv_fetchpvn_flags.
1560 *
1561 * It returns FALSE if the default stash can't be found nor created,
1562 * which might happen during global destruction.
1563 */
1564PERL_STATIC_INLINE bool
1565S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1566 const U32 is_utf8, const I32 add,
1567 const svtype sv_type)
1568{
1569 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1570
1571 /* No stash in name, so see how we can default */
90aeefb4 1572
536d1a88
BF		 1573 if ( gv_is_in_main(name, len, is_utf8) ) {
1574 *stash = PL_defstash;
1575 }
1576 else {
1577 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1578 *stash = PL_curstash;
1579 if (add && (PL_hints & HINT_STRICT_VARS) &&
1580 sv_type != SVt_PVCV &&
1581 sv_type != SVt_PVGV &&
1582 sv_type != SVt_PVFM &&
1583 sv_type != SVt_PVIO &&
1584 !(len == 1 && sv_type == SVt_PV &&
1585 (*name == 'a' || *name == 'b')) )
1586 {
c161da64 1587 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1588 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1589 SvTYPE(*gvp) != SVt_PVGV)
1590 {
1591 *stash = NULL;
1592 }
1593 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1594 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1595 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1596 {
1597 /* diag_listed_as: Variable "%s" is not imported%s */
1598 Perl_ck_warner_d(
1599 aTHX_ packWARN(WARN_MISC),
1600 "Variable \"%c%"UTF8f"\" is not imported",
1601 sv_type == SVt_PVAV ? '@' :
1602 sv_type == SVt_PVHV ? '%' : '$',
1603 UTF8fARG(is_utf8, len, name));
1604 if (GvCVu(*gvp))
1605 Perl_ck_warner_d(
1606 aTHX_ packWARN(WARN_MISC),
1607 "\t(Did you mean &%"UTF8f" instead?)\n",
1608 UTF8fARG(is_utf8, len, name)
1609 );
1610 *stash = NULL;
1611 }
1612 }
1613 }
1614 else {
1615 /* Use the current op's stash */
1616 *stash = CopSTASH(PL_curcop);
1617 }
1618 }
90aeefb4
BF		 1619
1620 if (!*stash) {
1621 if (add && !PL_in_clean_all) {
1622 SV * const err = Perl_mess(aTHX_
1623 "Global symbol \"%s%"UTF8f
1624 "\" requires explicit package name",
1625 (sv_type == SVt_PV ? "$"
1626 : sv_type == SVt_PVAV ? "@"
1627 : sv_type == SVt_PVHV ? "%"
1628 : ""), UTF8fARG(is_utf8, len, name));
1629 GV *gv;
1630 if (is_utf8)
1631 SvUTF8_on(err);
1632 qerror(err);
cd164bf8
BF		 1633 /* To maintain the output of errors after the strict exception
1634 * above, and to keep compat with older releases, rather than
1635 * placing the variables in the pad, we place
1636 * them in the <none>:: stash.
1637 */
90aeefb4
BF		 1638 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1639 if (!gv) {
1640 /* symbol table under destruction */
1641 return FALSE;
1642 }
1643 *stash = GvHV(gv);
1644 }
1645 else
1646 return FALSE;
1647 }
1648
1649 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1650 return FALSE;
1651
1652 return TRUE;
1653}
1654
930867a8
BF		 1655/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1656 * a new GV.
1657 * Note that it does not insert the GV into the stash prior to
1658 * magicalization, which some variables require need in order
1659 * to work (like $[, %+, %-, %!), so callers must take care of
1660 * that beforehand.
1661 *
1662 * The return value has a specific meaning for gv_fetchpvn_flags:
1663 * If it returns true, and the gv is empty, it indicates that its
1664 * refcount should be decreased.
1665 */
1666PERL_STATIC_INLINE bool
1667S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1668 bool addmg, const svtype sv_type)
79072805 1669{
960b831f 1670 SSize_t paren;
79072805 1671
930867a8 1672 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1673
44428a46 1674 if (stash != PL_defstash) { /* not the main stash */
ea238638 1675 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1676 and VERSION. All the others apply only to the main stash or to
1677 CORE (which is checked right after this). */
ea238638 1678 if (len) {
b464bac0 1679 const char * const name2 = name + 1;
cc4c2da6 1680 switch (*name) {
cc4c2da6
NC		 1681 case 'E':
1682 if (strnEQ(name2, "XPORT", 5))
1683 GvMULTI_on(gv);
1684 break;
1685 case 'I':
44428a46 1686 if (strEQ(name2, "SA"))
290a1700 1687 gv_magicalize_isa(gv);
cc4c2da6 1688 break;
44428a46
FC		 1689 case 'V':
1690 if (strEQ(name2, "ERSION"))
1691 GvMULTI_on(gv);
1692 break;
ea238638
FC		 1693 case 'a':
1694 case 'b':
1695 if (len == 1 && sv_type == SVt_PV)
1696 GvMULTI_on(gv);
1697 /* FALL THROUGH */
4aaa4757
FC		 1698 default:
1699 goto try_core;
1700 }
930867a8 1701 return addmg;
4aaa4757
FC		 1702 }
1703 try_core:
1704 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1705 /* Avoid null warning: */
1706 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1707 if (strnEQ(stashname, "CORE", 4))
1708 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1709 }
1710 }
1711 else if (len > 1) {
1712#ifndef EBCDIC
1713 if (*name > 'V' ) {
1714 NOOP;
1715 /* Nothing else to do.
1716 The compiler will probably turn the switch statement into a
1717 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1718 the common case of lower case variable names. (On EBCDIC
1719 platforms, we can't just do:
1720 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1721 because cases like '\027' in the switch statement below are
1722 C1 (non-ASCII) controls on those platforms, so the remapping
1723 would make them larger than 'V')
1724 */
44428a46
FC		 1725 } else
1726#endif
1727 {
1728 const char * const name2 = name + 1;
1729 switch (*name) {
1730 case 'A':
1731 if (strEQ(name2, "RGV")) {
1732 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1733 }
1734 else if (strEQ(name2, "RGVOUT")) {
1735 GvMULTI_on(gv);
1736 }
1737 break;
1738 case 'E':
1739 if (strnEQ(name2, "XPORT", 5))
1740 GvMULTI_on(gv);
1741 break;
1742 case 'I':
1743 if (strEQ(name2, "SA")) {
290a1700 1744 gv_magicalize_isa(gv);
44428a46
FC		 1745 }
1746 break;
cc4c2da6
NC		 1747 case 'S':
1748 if (strEQ(name2, "IG")) {
1749 HV *hv;
1750 I32 i;
d525a7b2
NC		 1751 if (!PL_psig_name) {
1752 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1753 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1754 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1755 } else {
1756 /* I think that the only way to get here is to re-use an
1757 embedded perl interpreter, where the previous
1758 use didn't clean up fully because
1759 PL_perl_destruct_level was 0. I'm not sure that we
1760 "support" that, in that I suspect in that scenario
1761 there are sufficient other garbage values left in the
1762 interpreter structure that something else will crash
1763 before we get here. I suspect that this is one of
1764 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1765 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1766 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1767 }
1768 GvMULTI_on(gv);
1769 hv = GvHVn(gv);
a0714e2c 1770 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1771 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1772 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1773 if (init)
1774 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1775 }
1776 }
1777 break;
1778 case 'V':
1779 if (strEQ(name2, "ERSION"))
1780 GvMULTI_on(gv);
1781 break;
e5218da5
GA		 1782 case '\003': /* $^CHILD_ERROR_NATIVE */
1783 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1784 goto magicalize;
1785 break;
cc4c2da6
NC		 1786 case '\005': /* $^ENCODING */
1787 if (strEQ(name2, "NCODING"))
1788 goto magicalize;
1789 break;
9ebf26ad
FR		 1790 case '\007': /* $^GLOBAL_PHASE */
1791 if (strEQ(name2, "LOBAL_PHASE"))
1792 goto ro_magicalize;
1793 break;
8561ea1d
FC		 1794 case '\014': /* $^LAST_FH */
1795 if (strEQ(name2, "AST_FH"))
1796 goto ro_magicalize;
1797 break;
cde0cee5 1798 case '\015': /* $^MATCH */
960b831f
NC		 1799 if (strEQ(name2, "ATCH")) {
1800 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1801 goto storeparen;
1802 }
66230c86 1803 break;
cc4c2da6
NC		 1804 case '\017': /* $^OPEN */
1805 if (strEQ(name2, "PEN"))
1806 goto magicalize;
1807 break;
cde0cee5 1808 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1809 if (strEQ(name2, "REMATCH")) {
1810 paren = RX_BUFF_IDX_CARET_PREMATCH;
1811 goto storeparen;
1812 }
1813 if (strEQ(name2, "OSTMATCH")) {
1814 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1815 goto storeparen;
1816 }
9ebf26ad 1817 break;
cc4c2da6
NC		 1818 case '\024': /* ${^TAINT} */
1819 if (strEQ(name2, "AINT"))
1820 goto ro_magicalize;
1821 break;
7cebcbc0 1822 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1823 if (strEQ(name2, "NICODE"))
cc4c2da6 1824 goto ro_magicalize;
a0288114 1825 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1826 goto ro_magicalize;
e07ea26a
NC		 1827 if (strEQ(name2, "TF8CACHE"))
1828 goto magicalize;
cc4c2da6
NC		 1829 break;
1830 case '\027': /* $^WARNING_BITS */
1831 if (strEQ(name2, "ARNING_BITS"))
1832 goto magicalize;
1833 break;
1834 case '1':
1835 case '2':
1836 case '3':
1837 case '4':
1838 case '5':
1839 case '6':
1840 case '7':
1841 case '8':
1842 case '9':
85e6fe83 1843 {
2fdbfb4d
AB		 1844 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1845 this test */
1846 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC		 1847 const char *end = name + len;
1848 while (--end > name) {
930867a8
BF		 1849 if (!isDIGIT(*end))
1850 return addmg;
cc4c2da6 1851 }
960b831f
NC		 1852 paren = strtoul(name, NULL, 10);
1853 goto storeparen;
1d7c1841 1854 }
dc437b57 1855 }
93a17b20 1856 }
392db708
NC		 1857 } else {
1858 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1859 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1860 switch (*name) {
6361f656 1861 case '&': /* $& */
960b831f
NC		 1862 paren = RX_BUFF_IDX_FULLMATCH;
1863 goto sawampersand;
6361f656 1864 case '`': /* $` */
960b831f
NC		 1865 paren = RX_BUFF_IDX_PREMATCH;
1866 goto sawampersand;
6361f656 1867 case '\'': /* $' */
960b831f
NC		 1868 paren = RX_BUFF_IDX_POSTMATCH;
1869 sawampersand:
1a904fc8 1870#ifdef PERL_SAWAMPERSAND
a289ef89 1871 if (!(
cc4c2da6
NC		 1872 sv_type == SVt_PVAV ||
1873 sv_type == SVt_PVHV ||
1874 sv_type == SVt_PVCV ||
1875 sv_type == SVt_PVFM ||
1876 sv_type == SVt_PVIO
d3b97530
DM		 1877 )) { PL_sawampersand |=
1878 (*name == '`')
1879 ? SAWAMPERSAND_LEFT
1880 : (*name == '&')
1881 ? SAWAMPERSAND_MIDDLE
1882 : SAWAMPERSAND_RIGHT;
1883 }
1a904fc8 1884#endif
960b831f 1885 goto storeparen;
e91d8259
NC		 1886 case '1': /* $1 */
1887 case '2': /* $2 */
1888 case '3': /* $3 */
1889 case '4': /* $4 */
1890 case '5': /* $5 */
1891 case '6': /* $6 */
1892 case '7': /* $7 */
1893 case '8': /* $8 */
1894 case '9': /* $9 */
960b831f
NC		 1895 paren = *name - '0';
1896
1897 storeparen:
e91d8259
NC		 1898 /* Flag the capture variables with a NULL mg_ptr
1899 Use mg_len for the array index to lookup. */
960b831f 1900 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1901 break;
cc4c2da6 1902
6361f656 1903 case ':': /* $: */
c69033f2 1904 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 1905 goto magicalize;
1906
6361f656 1907 case '?': /* $? */
ff0cee69 1908#ifdef COMPLEX_STATUS
c69033f2 1909 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1910#endif
cc4c2da6 1911 goto magicalize;
ff0cee69 1912
6361f656 1913 case '!': /* $! */
67261566 1914 GvMULTI_on(gv);
44a2ac75 1915 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1916
ad64d0ec 1917 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1918
44a2ac75 1919 /* magicalization must be done before require_tie_mod is called */
67261566 1920 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 1921 {
44a2ac75 1922 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 1923 addmg = FALSE;
ffdb8bcd 1924 }
d2c93421 1925
6cef1e77 1926 break;
6361f656
AB		 1927 case '-': /* $- */
1928 case '+': /* $+ */
44a2ac75
YO		 1929 GvMULTI_on(gv); /* no used once warnings here */
1930 {
44a2ac75 1931 AV* const av = GvAVn(gv);
ad64d0ec 1932 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1933
ad64d0ec
NC		 1934 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1935 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1936 if (avc)
44a2ac75 1937 SvREADONLY_on(GvSVn(gv));
44a2ac75 1938 SvREADONLY_on(av);
67261566
YO		 1939
1940 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 1941 {
192b9cd1 1942 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 1943 addmg = FALSE;
213084e4 1944 }
67261566 1945
80305961 1946 break;
cc4c2da6 1947 }
6361f656
AB		 1948 case '*': /* $* */
1949 case '#': /* $# */
9b387841 1950 if (sv_type == SVt_PV)
4f650b80 1951 /* diag_listed_as: $* is no longer supported */
9b387841 1952 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1953 "$%c is no longer supported", *name);
8ae1fe26 1954 break;
b3ca2e83
NC		 1955 case '\010': /* $^H */
1956 {
1957 HV *const hv = GvHVn(gv);
1958 hv_magic(hv, NULL, PERL_MAGIC_hints);
1959 }
1960 goto magicalize;
b82b06b8 1961 case '[': /* $[ */
7d69d4a6 1962 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1963 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 1964 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 1965 addmg = FALSE;
b82b06b8 1966 }
7d69d4a6 1967 else goto magicalize;
b82b06b8 1968 break;
cc4c2da6 1969 case '\023': /* $^S */
2fdbfb4d
AB		 1970 ro_magicalize:
1971 SvREADONLY_on(GvSVn(gv));
1972 /* FALL THROUGH */
6361f656 1973 case '0': /* $0 */
6361f656
AB		 1974 case '^': /* $^ */
1975 case '~': /* $~ */
1976 case '=': /* $= */
1977 case '%': /* $% */
1978 case '.': /* $. */
1979 case '(': /* $( */
1980 case ')': /* $) */
1981 case '<': /* $< */
1982 case '>': /* $> */
1983 case '\\': /* $\ */
1984 case '/': /* $/ */
4505a31f 1985 case '|': /* $| */
9cdac2a2 1986 case '$': /* $$ */
cc4c2da6
NC		 1987 case '\001': /* $^A */
1988 case '\003': /* $^C */
1989 case '\004': /* $^D */
1990 case '\005': /* $^E */
1991 case '\006': /* $^F */
cc4c2da6
NC		 1992 case '\011': /* $^I, NOT \t in EBCDIC */
1993 case '\016': /* $^N */
1994 case '\017': /* $^O */
1995 case '\020': /* $^P */
1996 case '\024': /* $^T */
1997 case '\027': /* $^W */
1998 magicalize:
ad64d0ec 1999 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2000 break;
e521374c 2001
cc4c2da6 2002 case '\014': /* $^L */
76f68e9b 2003 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2004 break;
6361f656 2005 case ';': /* $; */
76f68e9b 2006 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2007 break;
6361f656 2008 case ']': /* $] */
cc4c2da6 2009 {
3638bf15 2010 SV * const sv = GvSV(gv);
d7aa5382 2011 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2012 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2013 GvSV(gv) = vnumify(PL_patchlevel);
2014 SvREADONLY_on(GvSV(gv));
2015 SvREFCNT_dec(sv);
93a17b20
LW		 2016 }
2017 break;
cc4c2da6
NC		 2018 case '\026': /* $^V */
2019 {
3638bf15 2020 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2021 GvSV(gv) = new_version(PL_patchlevel);
2022 SvREADONLY_on(GvSV(gv));
2023 SvREFCNT_dec(sv);
16070b82
GS		 2024 }
2025 break;
ea238638
FC		 2026 case 'a':
2027 case 'b':
dc3e91f6 2028 if (sv_type == SVt_PV)
ea238638 2029 GvMULTI_on(gv);
cc4c2da6 2030 }
79072805 2031 }
930867a8
BF		 2032
2033 return addmg;
71c35c05
BF		 2034}
2035
070dc475
BF		 2036/* This function is called when the stash already holds the GV of the magic
2037 * variable we're looking for, but we need to check that it has the correct
2038 * kind of magic. For example, if someone first uses $! and then %!, the
2039 * latter would end up here, and we add the Errno tie to the HASH slot of
2040 * the *! glob.
2041 */
2042PERL_STATIC_INLINE void
2043S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2044{
2045 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2046
2047 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2048 if (*name == '!')
2049 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2050 else if (*name == '-' || *name == '+')
2051 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2052 } else if (sv_type == SVt_PV) {
2053 if (*name == '*' || *name == '#') {
2054 /* diag_listed_as: $* is no longer supported */
2055 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2056 WARN_SYNTAX),
2057 "$%c is no longer supported", *name);
2058 }
2059 }
2060 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2061 switch (*name) {
2062 case '[':
2063 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2064 break;
2065#ifdef PERL_SAWAMPERSAND
2066 case '`':
2067 PL_sawampersand |= SAWAMPERSAND_LEFT;
2068 (void)GvSVn(gv);
2069 break;
2070 case '&':
2071 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2072 (void)GvSVn(gv);
2073 break;
2074 case '\'':
2075 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2076 (void)GvSVn(gv);
2077 break;
2078#endif
2079 }
2080 }
2081}
2082
71c35c05
BF		 2083GV *
2084Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2085 const svtype sv_type)
2086{
2087 dVAR;
2088 const char *name = nambeg;
2089 GV *gv = NULL;
2090 GV**gvp;
2091 STRLEN len;
2092 HV *stash = NULL;
2093 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2094 const I32 no_expand = flags & GV_NOEXPAND;
2095 const I32 add = flags & ~GV_NOADD_MASK;
2096 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2097 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2098 const char *const name_end = nambeg + full_len;
2099 U32 faking_it;
2100
2101 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2102
2103 /* If we have GV_NOTQUAL, the caller promised that
2104 * there is no stash, so we can skip the check.
2105 * Similarly if full_len is 0, since then we're
2106 * dealing with something like *{""} or ""->foo()
2107 */
2108 if ((flags & GV_NOTQUAL) || !full_len) {
2109 len = full_len;
2110 }
2111 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2112 if (name == name_end) return gv;
2113 }
2114 else {
2115 return NULL;
2116 }
2117
2118 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2119 return NULL;
2120 }
2121
2122 /* By this point we should have a stash and a name */
c161da64 2123 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2124 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2125 if (addmg) gv = (GV *)newSV(0);
2126 else return NULL;
2127 }
2128 else gv = *gvp, addmg = 0;
2129 /* From this point on, addmg means gv has not been inserted in the
2130 symtab yet. */
2131
2132 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2133 /* The GV already exists, so return it, but check if we need to do
2134 * anything else with it before that.
2135 */
71c35c05 2136 if (add) {
c002ae9a
BF		 2137 /* This is the heuristic that handles if a variable triggers the
2138 * 'used only once' warning. If there's already a GV in the stash
2139 * with this name, then we assume that the variable has been used
2140 * before and turn its MULTI flag on.
2141 * It's a heuristic because it can easily be "tricked", like with
2142 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2143 * not warning about $main::foo being used just once
2144 */
71c35c05
BF		 2145 GvMULTI_on(gv);
2146 gv_init_svtype(gv, sv_type);
2147 /* You reach this path once the typeglob has already been created,
2148 either by the same or a different sigil. If this path didn't
2149 exist, then (say) referencing $! first, and %! second would
2150 mean that %! was not handled correctly. */
2151 if (len == 1 && stash == PL_defstash) {
070dc475 2152 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2153 }
2154 else if (len == 3 && sv_type == SVt_PVAV
2155 && strnEQ(name, "ISA", 3)
2156 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2157 gv_magicalize_isa(gv);
2158 }
2159 return gv;
2160 } else if (no_init) {
2161 assert(!addmg);
2162 return gv;
c002ae9a
BF		 2163 }
2164 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2165 * don't expand it to a glob. This is an optimization so that things
2166 * copying constants over, like Exporter, don't have to be rewritten
2167 * to take into account that you can store more than just globs in
2168 * stashes.
2169 */
2170 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2171 assert(!addmg);
2172 return gv;
2173 }
2174
2175 /* Adding a new symbol.
2176 Unless of course there was already something non-GV here, in which case
2177 we want to behave as if there was always a GV here, containing some sort
2178 of subroutine.
2179 Otherwise we run the risk of creating things like GvIO, which can cause
2180 subtle bugs. eg the one that tripped up SQL::Translator */
2181
2182 faking_it = SvOK(gv);
2183
2184 if (add & GV_ADDWARN)
2185 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2186 "Had to create %"UTF8f" unexpectedly",
2187 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2188 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2189
9e5de6ae 2190 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2191 GvMULTI_on(gv) ;
2192
930867a8
BF		 2193 /* First, store the gv in the symtab if we're adding magic,
2194 * but only for non-empty GVs
2195 */
2196#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2197 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2198
2199 if ( addmg && !GvEMPTY(gv) ) {
2200 (void)hv_store(stash,name,len,(SV *)gv,0);
2201 }
2202
71c35c05 2203 /* set up magic where warranted */
930867a8
BF		 2204 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2205 /* See 23496c6 */
2206 if (GvEMPTY(gv)) {
2207 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2208 /* The GV was and still is "empty", except that now
2209 * it has the magic flags turned on, so we want it
2210 * stored in the symtab.
2211 */
2212 (void)hv_store(stash,name,len,(SV *)gv,0);
2213 }
2214 else {
2215 /* Most likely the temporary GV created above */
2216 SvREFCNT_dec_NN(gv);
2217 gv = NULL;
2218 }
2219 }
2220 }
71c35c05 2221
e6066781 2222 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2223 return gv;
79072805
LW		 2224}
2225
2226void
35a4481c 2227Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2228{
ed60a868 2229 const char *name;
35a4481c 2230 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2231
2232 PERL_ARGS_ASSERT_GV_FULLNAME4;
2233
666ea192 2234 sv_setpv(sv, prefix ? prefix : "");
a0288114 2235
52a6327b 2236 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2237 const STRLEN len = HvNAMELEN(hv);
2238 if (keepmain || strnNE(name, "main", len)) {
2239 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2240 sv_catpvs(sv,"::");
ed60a868 2241 }
43693395 2242 }
ed60a868 2243 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2244 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2245}
2246
2247void
35a4481c 2248Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2249{
099be4f1 2250 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2251
2252 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2253
46c461b5 2254 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2255}
2256
39a65960
DM		 2257
2258/* recursively scan a stash and any nested stashes looking for entries
2259 * that need the "only used once" warning raised
2260 */
2261
79072805 2262void
51da40ed 2263Perl_gv_check(pTHX_ HV *stash)
79072805 2264{
97aff369 2265 dVAR;
eb578fdb 2266 I32 i;
463ee0b2 2267
7918f24d
NC		 2268 PERL_ARGS_ASSERT_GV_CHECK;
2269
8990e307
LW		 2270 if (!HvARRAY(stash))
2271 return;
90754377
DM		 2272
2273 assert(SvOOK(stash));
90754377 2274
a0d0e21e 2275 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2276 const HE *entry;
90754377 2277 /* mark stash is being scanned, to avoid recursing */
339441ef 2278 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2279 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2280 GV *gv;
b7787f18 2281 HV *hv;
dc437b57 2282 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2283 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2284 {
90754377
DM		 2285 if (hv != PL_defstash && hv != stash
2286 && !(SvOOK(hv)
2287 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2288 )
a0d0e21e
LW		 2289 gv_check(hv); /* nested package */
2290 }
ecad31f0
BF		 2291 else if ( *HeKEY(entry) != '_'
2292 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2293 const char *file;
159b6efe 2294 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2295 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2296 continue;
1d7c1841 2297 file = GvFILE(gv);
1d7c1841 2298 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2299#ifdef USE_ITHREADS
2300 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2301#else
2302 CopFILEGV(PL_curcop)
2303 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2304#endif
9014280d 2305 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2306 "Name \"%"HEKf"::%"HEKf
2307 "\" used only once: possible typo",
2308 HEKfARG(HvNAME_HEK(stash)),
2309 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2310 }
79072805 2311 }
339441ef 2312 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2313 }
2314}
2315
2316GV *
9cc50d5b 2317Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2318{
97aff369 2319 dVAR;
9cc50d5b 2320 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2321 assert(!(flags & ~SVf_UTF8));
7918f24d 2322
b17a0679
FC		 2323 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2324 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2325 (long)PL_gensym++),
2326 GV_ADD, SVt_PVGV);
79072805
LW		 2327}
2328
2329/* hopefully this is only called on local symbol table entries */
2330
2331GP*
864dbfa3 2332Perl_gp_ref(pTHX_ GP *gp)
79072805 2333{
97aff369 2334 dVAR;
1d7c1841 2335 if (!gp)
d4c19fe8 2336 return NULL;
79072805 2337 gp->gp_refcnt++;
44a8e56a 2338 if (gp->gp_cv) {
2339 if (gp->gp_cvgen) {
e1a479c5
BB		 2340 /* If the GP they asked for a reference to contains
2341 a method cache entry, clear it first, so that we
2342 don't infect them with our cached entry */
e7881358 2343 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2344 gp->gp_cv = NULL;
44a8e56a 2345 gp->gp_cvgen = 0;
2346 }
44a8e56a 2347 }
79072805 2348 return gp;
79072805
LW		 2349}
2350
2351void
864dbfa3 2352Perl_gp_free(pTHX_ GV *gv)
79072805 2353{
97aff369 2354 dVAR;
79072805 2355 GP* gp;
b0d55c99 2356 int attempts = 100;
79072805 2357
f7877b28 2358 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2359 return;
f248d071 2360 if (gp->gp_refcnt == 0) {
9b387841
NC		 2361 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2362 "Attempt to free unreferenced glob pointers"
2363 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2364 return;
2365 }
4571f4a7 2366 if (gp->gp_refcnt > 1) {
bc81b34d 2367 borrowed:
748a9306
LW		 2368 if (gp->gp_egv == gv)
2369 gp->gp_egv = 0;
4571f4a7 2370 gp->gp_refcnt--;
c43ae56f 2371 GvGP_set(gv, NULL);
79072805 2372 return;
748a9306 2373 }
79072805 2374
b0d55c99
FC		 2375 while (1) {
2376 /* Copy and null out all the glob slots, so destructors do not see
2377 freed SVs. */
2378 HEK * const file_hek = gp->gp_file_hek;
2379 SV * const sv = gp->gp_sv;
2380 AV * const av = gp->gp_av;
2381 HV * const hv = gp->gp_hv;
2382 IO * const io = gp->gp_io;
2383 CV * const cv = gp->gp_cv;
2384 CV * const form = gp->gp_form;
2385
2386 gp->gp_file_hek = NULL;
2387 gp->gp_sv = NULL;
2388 gp->gp_av = NULL;
2389 gp->gp_hv = NULL;
2390 gp->gp_io = NULL;
2391 gp->gp_cv = NULL;
2392 gp->gp_form = NULL;
2393
2394 if (file_hek)
2395 unshare_hek(file_hek);
2396
2397 SvREFCNT_dec(sv);
2398 SvREFCNT_dec(av);
2399 /* FIXME - another reference loop GV -> symtab -> GV ?
2400 Somehow gp->gp_hv can end up pointing at freed garbage. */
2401 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2402 const HEK *hvname_hek = HvNAME_HEK(hv);
103f5a36 2403 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", hvname_hek));
c2242065 2404 if (PL_stashcache && hvname_hek)
0ca9877d 2405 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC		 2406 SvREFCNT_dec(hv);
2407 }
2408 SvREFCNT_dec(io);
2409 SvREFCNT_dec(cv);
2410 SvREFCNT_dec(form);
2411
bc81b34d
FC		 2412 /* Possibly reallocated by a destructor */
2413 gp = GvGP(gv);
2414
b0d55c99
FC		 2415 if (!gp->gp_file_hek
2416 && !gp->gp_sv
2417 && !gp->gp_av
2418 && !gp->gp_hv
2419 && !gp->gp_io
2420 && !gp->gp_cv
2421 && !gp->gp_form) break;
2422
2423 if (--attempts == 0) {
2424 Perl_die(aTHX_
2425 "panic: gp_free failed to free glob pointer - "
2426 "something is repeatedly re-creating entries"
2427 );
2428 }
13207a71 2429 }
748a9306 2430
bc81b34d
FC		 2431 /* Possibly incremented by a destructor doing glob assignment */
2432 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2433 Safefree(gp);
c43ae56f 2434 GvGP_set(gv, NULL);
79072805
LW		 2435}
2436
d460ef45
NIS		 2437int
2438Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2439{
53c1dcc0
AL		 2440 AMT * const amtp = (AMT*)mg->mg_ptr;
2441 PERL_UNUSED_ARG(sv);
dd374669 2442
7918f24d
NC		 2443 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2444
d460ef45
NIS		 2445 if (amtp && AMT_AMAGIC(amtp)) {
2446 int i;
2447 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2448 CV * const cv = amtp->table[i];
b37c2d43 2449 if (cv) {
e7881358 2450 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2451 amtp->table[i] = NULL;
d460ef45
NIS		 2452 }
2453 }
2454 }
2455 return 0;
2456}
2457
a0d0e21e 2458/* Updates and caches the CV's */
c3a9a790
RGS		 2459/* Returns:
2460 * 1 on success and there is some overload
2461 * 0 if there is no overload
2462 * -1 if some error occurred and it couldn't croak
2463 */
a0d0e21e 2464
c3a9a790 2465int
242f8760 2466Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2467{
97aff369 2468 dVAR;
ad64d0ec 2469 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2470 AMT amt;
9b439311 2471 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2472 U32 newgen;
a0d0e21e 2473
7918f24d
NC		 2474 PERL_ARGS_ASSERT_GV_AMUPDATE;
2475
9b439311 2476 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2477 if (mg) {
2478 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2479 if (amtp->was_ok_sub == newgen) {
8c34e50d 2480 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2481 }
ad64d0ec 2482 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2483 }
a0d0e21e 2484
bfcb3514 2485 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2486
d460ef45 2487 Zero(&amt,1,AMT);
e1a479c5 2488 amt.was_ok_sub = newgen;
a6006777 2489 amt.fallback = AMGfallNO;
2490 amt.flags = 0;
2491
a6006777 2492 {
8c34e50d
FC		 2493 int filled = 0;
2494 int i;
3d147ac2
DM		 2495 bool deref_seen = 0;
2496
a6006777 2497
3866ea3b 2498 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2499
89ffc314 2500 /* Try to find via inheritance. */
e6919483 2501 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2502 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2503 CV* cv;
89ffc314
IZ		 2504
2505 if (!gv)
3866ea3b
FC		 2506 {
2507 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2508 goto no_table;
3866ea3b
FC		 2509 }
2510#ifdef PERL_DONT_CREATE_GVSV
2511 else if (!sv) {
6f207bd3 2512 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2513 }
2514#endif
79c9643d
JL		 2515 else if (SvTRUE(sv))
2516 /* don't need to set overloading here because fallback => 1
2517 * is the default setting for classes without overloading */
89ffc314 2518 amt.fallback=AMGfallYES;
79c9643d
JL		 2519 else if (SvOK(sv)) {
2520 amt.fallback=AMGfallNEVER;
386a5489 2521 filled = 1;
386a5489 2522 }
79c9643d 2523 else {
386a5489 2524 filled = 1;
386a5489 2525 }
a6006777 2526
3d147ac2 2527 assert(SvOOK(stash));
3d147ac2 2528 /* initially assume the worst */
339441ef 2529 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2530
8c34e50d 2531 for (i = 1; i < NofAMmeth; i++) {
6136c704 2532 const char * const cooky = PL_AMG_names[i];
32251b26 2533 /* Human-readable form, for debugging: */
8c34e50d 2534 const char * const cp = AMG_id2name(i);
d279ab82 2535 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2536
a0288114 2537 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2538 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2539 /* don't fill the cache while looking up!
2540 Creation of inheritance stubs in intermediate packages may
2541 conflict with the logic of runtime method substitution.
2542 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2543 then we could have created stubs for "(+0" in A and C too.
2544 But if B overloads "bool", we may want to use it for
2545 numifying instead of C's "+0". */
8c34e50d 2546 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2547 cv = 0;
89ffc314 2548 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC		 2549 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2550 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2551 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2552 && strEQ(hvname, "overload")) {
611c1e95
IZ		 2553 /* This is a hack to support autoloading..., while
2554 knowing *which* methods were declared as overloaded. */
44a8e56a 2555 /* GvSV contains the name of the method. */
6136c704 2556 GV *ngv = NULL;
c69033f2 2557 SV *gvsv = GvSV(gv);
a0288114
AL		 2558
2559 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2560 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2561 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2562 if (!gvsv || !SvPOK(gvsv)
7f415459 2563 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2564 {
a0288114 2565 /* Can be an import stub (created by "can"). */
242f8760 2566 if (destructing) {
c3a9a790 2567 return -1;
242f8760
RGS		 2568 }
2569 else {
d66cca07
BF		 2570 const SV * const name = (gvsv && SvPOK(gvsv))
2571 ? gvsv
2572 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2573 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2574 Perl_croak(aTHX_ "%s method \"%"SVf256
2575 "\" overloading \"%s\" "\
d0c0e7dd 2576 "in package \"%"HEKf256"\"",
242f8760
RGS		 2577 (GvCVGEN(gv) ? "Stub found while resolving"
2578 : "Can't resolve"),
d66cca07 2579 SVfARG(name), cp,
d0c0e7dd 2580 HEKfARG(
d66cca07 2581 HvNAME_HEK(stash)
d0c0e7dd 2582 ));
242f8760 2583 }
44a8e56a 2584 }
dc848c6f 2585 cv = GvCV(gv = ngv);
f0e9f182 2586 }
44a8e56a 2587 }
b464bac0 2588 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2589 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2590 GvNAME(CvGV(cv))) );
2591 filled = 1;
611c1e95 2592 } else if (gv) { /* Autoloaded... */
ea726b52 2593 cv = MUTABLE_CV(gv);
611c1e95 2594 filled = 1;
44a8e56a 2595 }
ea726b52 2596 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2597
2598 if (gv) {
2599 switch (i) {
2600 case to_sv_amg:
2601 case to_av_amg:
2602 case to_hv_amg:
2603 case to_gv_amg:
2604 case to_cv_amg:
2605 case nomethod_amg:
2606 deref_seen = 1;
2607 break;
2608 }
2609 }
a0d0e21e 2610 }
3d147ac2 2611 if (!deref_seen)
45479970
DM		 2612 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2613 * NB - aux var invalid here, HvARRAY() could have been
2614 * reallocated since it was assigned to */
2615 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2616
a0d0e21e 2617 if (filled) {
a6006777 2618 AMT_AMAGIC_on(&amt);
ad64d0ec 2619 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2620 (char*)&amt, sizeof(AMT));
8c34e50d 2621 return TRUE;
a0d0e21e
LW		 2622 }
2623 }
a6006777 2624 /* Here we have no table: */
8c34e50d 2625 no_table:
a6006777 2626 AMT_AMAGIC_off(&amt);
ad64d0ec 2627 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2628 (char*)&amt, sizeof(AMTS));
c3a9a790 2629 return 0;
a0d0e21e
LW		 2630}
2631
32251b26
IZ		 2632
2633CV*
2634Perl_gv_handler(pTHX_ HV *stash, I32 id)
2635{
97aff369 2636 dVAR;
3f8f4626 2637 MAGIC *mg;
32251b26 2638 AMT *amtp;
e1a479c5 2639 U32 newgen;
9b439311 2640 struct mro_meta* stash_meta;
32251b26 2641
bfcb3514 2642 if (!stash || !HvNAME_get(stash))
601f1833 2643 return NULL;
e1a479c5 2644
9b439311
BB		 2645 stash_meta = HvMROMETA(stash);
2646 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2647
ad64d0ec 2648 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2649 if (!mg) {
2650 do_update:
8c34e50d 2651 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2652 return NULL;
ad64d0ec 2653 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2654 }
a9fd4e40 2655 assert(mg);
32251b26 2656 amtp = (AMT*)mg->mg_ptr;
66978156 2657 if ( amtp->was_ok_sub != newgen )
32251b26 2658 goto do_update;
3ad83ce7 2659 if (AMT_AMAGIC(amtp)) {
b7787f18 2660 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2661 if (ret && isGV(ret)) { /* Autoloading stab */
2662 /* Passing it through may have resulted in a warning
2663 "Inherited AUTOLOAD for a non-method deprecated", since
2664 our caller is going through a function call, not a method call.
2665 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2666 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2667
2668 if (gv && GvCV(gv))
2669 return GvCV(gv);
2670 }
2671 return ret;
2672 }
a0288114 2673
601f1833 2674 return NULL;
32251b26
IZ		 2675}
2676
2677
6f1401dc
DM		 2678/* Implement tryAMAGICun_MG macro.
2679 Do get magic, then see if the stack arg is overloaded and if so call it.
2680 Flags:
2681 AMGf_set return the arg using SETs rather than assigning to
2682 the targ
2683 AMGf_numeric apply sv_2num to the stack arg.
2684*/
2685
2686bool
2687Perl_try_amagic_un(pTHX_ int method, int flags) {
2688 dVAR;
2689 dSP;
2690 SV* tmpsv;
2691 SV* const arg = TOPs;
2692
2693 SvGETMAGIC(arg);
2694
9f8bf298
NC		 2695 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2696 AMGf_noright | AMGf_unary))) {
6f1401dc
DM		 2697 if (flags & AMGf_set) {
2698 SETs(tmpsv);
2699 }
2700 else {
2701 dTARGET;
2702 if (SvPADMY(TARG)) {
2703 sv_setsv(TARG, tmpsv);
2704 SETTARG;
2705 }
2706 else
2707 SETs(tmpsv);
2708 }
2709 PUTBACK;
2710 return TRUE;
2711 }
2712
2713 if ((flags & AMGf_numeric) && SvROK(arg))
2714 *sp = sv_2num(arg);
2715 return FALSE;
2716}
2717
2718
2719/* Implement tryAMAGICbin_MG macro.
2720 Do get magic, then see if the two stack args are overloaded and if so
2721 call it.
2722 Flags:
2723 AMGf_set return the arg using SETs rather than assigning to
2724 the targ
2725 AMGf_assign op may be called as mutator (eg +=)
2726 AMGf_numeric apply sv_2num to the stack arg.
2727*/
2728
2729bool
2730Perl_try_amagic_bin(pTHX_ int method, int flags) {
2731 dVAR;
2732 dSP;
2733 SV* const left = TOPm1s;
2734 SV* const right = TOPs;
2735
2736 SvGETMAGIC(left);
2737 if (left != right)
2738 SvGETMAGIC(right);
2739
2740 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2741 SV * const tmpsv = amagic_call(left, right, method,
2742 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2743 if (tmpsv) {
2744 if (flags & AMGf_set) {
2745 (void)POPs;
2746 SETs(tmpsv);
2747 }
2748 else {
2749 dATARGET;
2750 (void)POPs;
2751 if (opASSIGN || SvPADMY(TARG)) {
2752 sv_setsv(TARG, tmpsv);
2753 SETTARG;
2754 }
2755 else
2756 SETs(tmpsv);
2757 }
2758 PUTBACK;
2759 return TRUE;
2760 }
2761 }
75ea7a12
FC		 2762 if(left==right && SvGMAGICAL(left)) {
2763 SV * const left = sv_newmortal();
2764 *(sp-1) = left;
2765 /* Print the uninitialized warning now, so it includes the vari-
2766 able name. */
2767 if (!SvOK(right)) {
2768 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2769 sv_setsv_flags(left, &PL_sv_no, 0);
2770 }
2771 else sv_setsv_flags(left, right, 0);
2772 SvGETMAGIC(right);
2773 }
6f1401dc 2774 if (flags & AMGf_numeric) {
75ea7a12
FC		 2775 if (SvROK(TOPm1s))
2776 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2777 if (SvROK(right))
2778 *sp = sv_2num(right);
2779 }
2780 return FALSE;
2781}
2782
25a9ffce
NC		 2783SV *
2784Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2785 SV *tmpsv = NULL;
3d147ac2 2786 HV *stash;
25a9ffce
NC		 2787
2788 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2789
3d147ac2
DM		 2790 if (!SvAMAGIC(ref))
2791 return ref;
2792 /* return quickly if none of the deref ops are overloaded */
2793 stash = SvSTASH(SvRV(ref));
2794 assert(SvOOK(stash));
2795 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2796 return ref;
2797
2798 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2799 AMGf_noright | AMGf_unary))) {
2800 if (!SvROK(tmpsv))
2801 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2802 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2803 /* Bail out if it returns us the same reference. */
2804 return tmpsv;
2805 }
2806 ref = tmpsv;
3d147ac2
DM		 2807 if (!SvAMAGIC(ref))
2808 break;
25a9ffce
NC		 2809 }
2810 return tmpsv ? tmpsv : ref;
2811}
6f1401dc 2812
8d569291
FC		 2813bool
2814Perl_amagic_is_enabled(pTHX_ int method)
2815{
2816 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2817
2818 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2819
2820 if ( !lex_mask || !SvOK(lex_mask) )
2821 /* overloading lexically disabled */
2822 return FALSE;
2823 else if ( lex_mask && SvPOK(lex_mask) ) {
2824 /* we have an entry in the hints hash, check if method has been
2825 * masked by overloading.pm */
2826 STRLEN len;
2827 const int offset = method / 8;
2828 const int bit = method % 8;
2829 char *pv = SvPV(lex_mask, len);
2830
2831 /* Bit set, so this overloading operator is disabled */
2832 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2833 return FALSE;
2834 }
2835 return TRUE;
2836}
2837
a0d0e21e 2838SV*
864dbfa3 2839Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2840{
27da23d5 2841 dVAR;
b267980d 2842 MAGIC *mg;
9c5ffd7c 2843 CV *cv=NULL;
a0d0e21e 2844 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2845 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 2846 int off = 0, off1, lr = 0, notfound = 0;
2847 int postpr = 0, force_cpy = 0;
2848 int assign = AMGf_assign & flags;
2849 const int assignshift = assign ? 1 : 0;
bf5522a1 2850 int use_default_op = 0;
67288365 2851 int force_scalar = 0;
497b47a8
JH		 2852#ifdef DEBUGGING
2853 int fl=0;
497b47a8 2854#endif
25716404 2855 HV* stash=NULL;
7918f24d
NC		 2856
2857 PERL_ARGS_ASSERT_AMAGIC_CALL;
2858
e46c382e 2859 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2860 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 2861 }
2862
a0d0e21e 2863 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2864 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2865 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2866 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2867 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2868 : NULL))
b267980d 2869 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 2870 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2871 * usual method */
497b47a8
JH		 2872 (
2873#ifdef DEBUGGING
2874 fl = 1,
a0288114 2875#endif
497b47a8 2876 cv = cvp[off=method])))) {
a0d0e21e
LW		 2877 lr = -1; /* Call method for left argument */
2878 } else {
2879 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2880 int logic;
2881
2882 /* look for substituted methods */
ee239bfe 2883 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 2884 switch (method) {
2885 case inc_amg:
ee239bfe
IZ		 2886 force_cpy = 1;
2887 if ((cv = cvp[off=add_ass_amg])
2888 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2889 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2890 }
2891 break;
2892 case dec_amg:
ee239bfe
IZ		 2893 force_cpy = 1;
2894 if ((cv = cvp[off = subtr_ass_amg])
2895 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2896 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2897 }
2898 break;
2899 case bool__amg:
2900 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2901 break;
2902 case numer_amg:
2903 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2904 break;
2905 case string_amg:
2906 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2907 break;
b7787f18
AL		 2908 case not_amg:
2909 (void)((cv = cvp[off=bool__amg])
2910 || (cv = cvp[off=numer_amg])
2911 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 2912 if (cv)
2913 postpr = 1;
b7787f18 2914 break;
748a9306
LW		 2915 case copy_amg:
2916 {
76e3520e
GS		 2917 /*
2918 * SV* ref causes confusion with the interpreter variable of
2919 * the same name
2920 */
890ce7af 2921 SV* const tmpRef=SvRV(left);
76e3520e 2922 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 2923 /*
2924 * Just to be extra cautious. Maybe in some
2925 * additional cases sv_setsv is safe, too.
2926 */
890ce7af 2927 SV* const newref = newSVsv(tmpRef);
748a9306 2928 SvOBJECT_on(newref);
a1cd65be
FC		 2929 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2930 delegate to the stash. */
85fbaab2 2931 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 2932 return newref;
2933 }
2934 }
2935 break;
a0d0e21e 2936 case abs_amg:
b267980d 2937 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2938 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2939 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2940 if (off1==lt_amg) {
890ce7af 2941 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2942 lt_amg,AMGf_noright);
2943 logic = SvTRUE(lessp);
2944 } else {
890ce7af 2945 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2946 ncmp_amg,AMGf_noright);
2947 logic = (SvNV(lessp) < 0);
2948 }
2949 if (logic) {
2950 if (off==subtr_amg) {
2951 right = left;
748a9306 2952 left = nullsv;
a0d0e21e
LW		 2953 lr = 1;
2954 }
2955 } else {
2956 return left;
2957 }
2958 }
2959 break;
2960 case neg_amg:
155aba94 2961 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 2962 right = left;
2963 left = sv_2mortal(newSViv(0));
2964 lr = 1;
2965 }
2966 break;
f216259d 2967 case int_amg:
f5284f61 2968 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2969 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2970 case regexp_amg:
b267980d
NIS		 2971 /* FAIL safe */
2972 return NULL; /* Delegate operation to standard mechanisms. */
2973 break;
f5284f61
IZ		 2974 case to_sv_amg:
2975 case to_av_amg:
2976 case to_hv_amg:
2977 case to_gv_amg:
2978 case to_cv_amg:
2979 /* FAIL safe */
b267980d 2980 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2981 break;
a0d0e21e
LW		 2982 default:
2983 goto not_found;
2984 }
2985 if (!cv) goto not_found;
2986 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2987 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2988 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2989 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2990 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2991 : NULL))
69815d08
RS		 2992 && (cv = cvp[off=method])) { /* Method for right
2993 * argument found */
2994 lr=1;
bf5522a1
MB		 2995 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2996 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 2997 && !(flags & AMGf_unary)) {
2998 /* We look for substitution for
2999 * comparison operations and
fc36a67e 3000 * concatenation */
a0d0e21e
LW		 3001 if (method==concat_amg || method==concat_ass_amg
3002 || method==repeat_amg || method==repeat_ass_amg) {
3003 return NULL; /* Delegate operation to string conversion */
3004 }
3005 off = -1;
3006 switch (method) {
3007 case lt_amg:
3008 case le_amg:
3009 case gt_amg:
3010 case ge_amg:
3011 case eq_amg:
3012 case ne_amg:
2ab54efd
MB		 3013 off = ncmp_amg;
3014 break;
a0d0e21e
LW		 3015 case slt_amg:
3016 case sle_amg:
3017 case sgt_amg:
3018 case sge_amg:
3019 case seq_amg:
3020 case sne_amg:
2ab54efd
MB		 3021 off = scmp_amg;
3022 break;
a0d0e21e 3023 }
bf5522a1
MB		 3024 if (off != -1) {
3025 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3026 cv = ocvp[off];
3027 lr = -1;
3028 }
3029 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3030 cv = cvp[off];
3031 lr = 1;
3032 }
3033 }
3034 if (cv)
2ab54efd
MB		 3035 postpr = 1;
3036 else
3037 goto not_found;
a0d0e21e 3038 } else {
a6006777 3039 not_found: /* No method found, either report or croak */
b267980d
NIS		 3040 switch (method) {
3041 case to_sv_amg:
3042 case to_av_amg:
3043 case to_hv_amg:
3044 case to_gv_amg:
3045 case to_cv_amg:
3046 /* FAIL safe */
3047 return left; /* Delegate operation to standard mechanisms. */
3048 break;
3049 }
a0d0e21e
LW		 3050 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3051 notfound = 1; lr = -1;
3052 } else if (cvp && (cv=cvp[nomethod_amg])) {
3053 notfound = 1; lr = 1;
bf5522a1
MB		 3054 } else if ((use_default_op =
3055 (!ocvp || oamtp->fallback >= AMGfallYES)
3056 && (!cvp || amtp->fallback >= AMGfallYES))
3057 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3058 /* Skip generating the "no method found" message. */
3059 return NULL;
a0d0e21e 3060 } else {
46fc3d4c 3061 SV *msg;
774d564b 3062 if (off==-1) off=method;
b267980d 3063 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3064 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3065 AMG_id2name(method + assignshift),
3066 (flags & AMGf_unary ? " " : "\n\tleft "),
3067 SvAMAGIC(left)?
3068 "in overloaded package ":
3069 "has no overloaded magic",
3070 SvAMAGIC(left)?
3071 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3072 SVfARG(&PL_sv_no),
3073 SvAMAGIC(right)?
3074 ",\n\tright argument in overloaded package ":
3075 (flags & AMGf_unary
3076 ? ""
3077 : ",\n\tright argument has no overloaded magic"),
3078 SvAMAGIC(right)?
3079 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3080 SVfARG(&PL_sv_no)));
bf5522a1 3081 if (use_default_op) {
d66cca07 3082 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3083 } else {
be2597df 3084 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3085 }
3086 return NULL;
3087 }
ee239bfe 3088 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3089 }
3090 }
67288365
JL		 3091
3092 switch (method) {
3093 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3094 * operation. we need this to return a value, so that it can be assigned
3095 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3096 * increment or decrement was itself called in void context */
3097 case inc_amg:
3098 if (off == add_amg)
3099 force_scalar = 1;
3100 break;
3101 case dec_amg:
3102 if (off == subtr_amg)
3103 force_scalar = 1;
3104 break;
3105 /* in these cases, we're calling an assignment variant of an operator
3106 * (+= rather than +, for instance). regardless of whether it's a
3107 * fallback or not, it always has to return a value, which will be
3108 * assigned to the proper variable later */
3109 case add_amg:
3110 case subtr_amg:
3111 case mult_amg:
3112 case div_amg:
3113 case modulo_amg:
3114 case pow_amg:
3115 case lshift_amg:
3116 case rshift_amg:
3117 case repeat_amg:
3118 case concat_amg:
3119 case band_amg:
3120 case bor_amg:
3121 case bxor_amg:
3122 if (assign)
3123 force_scalar = 1;
3124 break;
3125 /* the copy constructor always needs to return a value */
3126 case copy_amg:
3127 force_scalar = 1;
3128 break;
3129 /* because of the way these are implemented (they don't perform the
3130 * dereferencing themselves, they return a reference that perl then
3131 * dereferences later), they always have to be in scalar context */
3132 case to_sv_amg:
3133 case to_av_amg:
3134 case to_hv_amg:
3135 case to_gv_amg:
3136 case to_cv_amg:
3137 force_scalar = 1;
3138 break;
3139 /* these don't have an op of their own; they're triggered by their parent
3140 * op, so the context there isn't meaningful ('$a and foo()' in void
3141 * context still needs to pass scalar context on to $a's bool overload) */
3142 case bool__amg:
3143 case numer_amg:
3144 case string_amg:
3145 force_scalar = 1;
3146 break;
3147 }
3148
497b47a8 3149#ifdef DEBUGGING
a0d0e21e 3150 if (!notfound) {
497b47a8 3151 DEBUG_o(Perl_deb(aTHX_
d66cca07 3152 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3153 AMG_id2name(off),
3154 method+assignshift==off? "" :
a0288114 3155 " (initially \"",
497b47a8
JH		 3156 method+assignshift==off? "" :
3157 AMG_id2name(method+assignshift),
a0288114 3158 method+assignshift==off? "" : "\")",
497b47a8
JH		 3159 flags & AMGf_unary? "" :
3160 lr==1 ? " for right argument": " for left argument",
3161 flags & AMGf_unary? " for argument" : "",
d66cca07 3162 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3163 fl? ",\n\tassignment variant used": "") );
ee239bfe 3164 }
497b47a8 3165#endif
748a9306
LW		 3166 /* Since we use shallow copy during assignment, we need
3167 * to dublicate the contents, probably calling user-supplied
3168 * version of copy operator
3169 */
ee239bfe
IZ		 3170 /* We need to copy in following cases:
3171 * a) Assignment form was called.
3172 * assignshift==1, assign==T, method + 1 == off
3173 * b) Increment or decrement, called directly.
3174 * assignshift==0, assign==0, method + 0 == off
3175 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3176 * assignshift==0, assign==T,
ee239bfe
IZ		 3177 * force_cpy == T
3178 * d) Increment or decrement, translated to nomethod.
b267980d 3179 * assignshift==0, assign==0,
ee239bfe
IZ		 3180 * force_cpy == T
3181 * e) Assignment form translated to nomethod.
3182 * assignshift==1, assign==T, method + 1 != off
3183 * force_cpy == T
3184 */
3185 /* off is method, method+assignshift, or a result of opcode substitution.
3186 * In the latter case assignshift==0, so only notfound case is important.
3187 */
73512201 3188 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3189 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3190 || force_cpy) )
6f1401dc 3191 {
1b38c28e
NC		 3192 /* newSVsv does not behave as advertised, so we copy missing
3193 * information by hand */
3194 SV *tmpRef = SvRV(left);
3195 SV *rv_copy;
31d632c3 3196 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3197 SvRV_set(left, rv_copy);
3198 SvSETMAGIC(left);
e7881358 3199 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3200 }
6f1401dc
DM		 3201 }
3202
a0d0e21e
LW		 3203 {
3204 dSP;
3205 BINOP myop;
3206 SV* res;
b7787f18 3207 const bool oldcatch = CATCH_GET;
67288365
JL		 3208 I32 oldmark, nret;
3209 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3210
54310121 3211 CATCH_SET(TRUE);
a0d0e21e
LW		 3212 Zero(&myop, 1, BINOP);
3213 myop.op_last = (OP *) &myop;
b37c2d43 3214 myop.op_next = NULL;
67288365
JL		 3215 myop.op_flags = OPf_STACKED;
3216
3217 switch (gimme) {
3218 case G_VOID:
3219 myop.op_flags |= OPf_WANT_VOID;
3220 break;
3221 case G_ARRAY:
3222 if (flags & AMGf_want_list) {
3223 myop.op_flags |= OPf_WANT_LIST;
3224 break;
3225 }
3226 /* FALLTHROUGH */
3227 default:
3228 myop.op_flags |= OPf_WANT_SCALAR;
3229 break;
3230 }
a0d0e21e 3231
e788e7d3 3232 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3233 ENTER;
462e5cf6 3234 SAVEOP();
533c011a 3235 PL_op = (OP *) &myop;
3280af22 3236 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3237 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3238 Perl_pp_pushmark(aTHX);
a0d0e21e 3239
924508f0 3240 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3241 PUSHs(lr>0? right: left);
3242 PUSHs(lr>0? left: right);
3280af22 3243 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3244 if (notfound) {
59cd0e26
NC		 3245 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3246 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3247 }
ad64d0ec 3248 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3249 PUTBACK;
67288365 3250 oldmark = TOPMARK;
a0d0e21e 3251
139d0ce6 3252 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3253 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3254 LEAVE;
3255 SPAGAIN;
67288365
JL		 3256 nret = SP - (PL_stack_base + oldmark);
3257
3258 switch (gimme) {
3259 case G_VOID:
3260 /* returning NULL has another meaning, and we check the context
3261 * at the call site too, so this can be differentiated from the
3262 * scalar case */
3263 res = &PL_sv_undef;
3264 SP = PL_stack_base + oldmark;
3265 break;
3266 case G_ARRAY: {
3267 if (flags & AMGf_want_list) {
3268 res = sv_2mortal((SV *)newAV());
3269 av_extend((AV *)res, nret);
3270 while (nret--)
3271 av_store((AV *)res, nret, POPs);
3272 break;
3273 }
3274 /* FALLTHROUGH */
3275 }
3276 default:
3277 res = POPs;
3278 break;
3279 }
a0d0e21e 3280
ebafeae7 3281 PUTBACK;
d3acc0f7 3282 POPSTACK;
54310121 3283 CATCH_SET(oldcatch);
a0d0e21e 3284
a0d0e21e 3285 if (postpr) {
b7787f18 3286 int ans;
a0d0e21e
LW		 3287 switch (method) {
3288 case le_amg:
3289 case sle_amg:
3290 ans=SvIV(res)<=0; break;
3291 case lt_amg:
3292 case slt_amg:
3293 ans=SvIV(res)<0; break;
3294 case ge_amg:
3295 case sge_amg:
3296 ans=SvIV(res)>=0; break;
3297 case gt_amg:
3298 case sgt_amg:
3299 ans=SvIV(res)>0; break;
3300 case eq_amg:
3301 case seq_amg:
3302 ans=SvIV(res)==0; break;
3303 case ne_amg:
3304 case sne_amg:
3305 ans=SvIV(res)!=0; break;
3306 case inc_amg:
3307 case dec_amg:
bbce6d69 3308 SvSetSV(left,res); return left;
dc437b57 3309 case not_amg:
fe7ac86a 3310 ans=!SvTRUE(res); break;
b7787f18
AL		 3311 default:
3312 ans=0; break;
a0d0e21e 3313 }
54310121 3314 return boolSV(ans);
748a9306
LW		 3315 } else if (method==copy_amg) {
3316 if (!SvROK(res)) {
cea2e8a9 3317 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3318 }
3319 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3320 } else {
3321 return res;
3322 }
3323 }
3324}
c9d5ac95 3325
f5c1e807
NC		 3326void
3327Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3328{
3329 dVAR;
acda4c6a 3330 U32 hash;
f5c1e807 3331
7918f24d 3332 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3333
acda4c6a
NC		 3334 if (len > I32_MAX)
3335 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3336
ae8cc45f
NC		 3337 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3338 unshare_hek(GvNAME_HEK(gv));
3339 }
3340
acda4c6a 3341 PERL_HASH(hash, name, len);
c60dbbc3 3342 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3343}
3344
66610fdd 3345/*
f7461760
Z		 3346=for apidoc gv_try_downgrade
3347
2867cdbc
Z		 3348If the typeglob C<gv> can be expressed more succinctly, by having
3349something other than a real GV in its place in the stash, replace it
3350with the optimised form. Basic requirements for this are that C<gv>
3351is a real typeglob, is sufficiently ordinary, and is only referenced
3352from its package. This function is meant to be used when a GV has been
3353looked up in part to see what was there, causing upgrading, but based
3354on what was found it turns out that the real GV isn't required after all.
3355
3356If C<gv> is a completely empty typeglob, it is deleted from the stash.
3357
3358If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3359sub, the typeglob is replaced with a scalar-reference placeholder that
3360more compactly represents the same thing.
f7461760
Z		 3361
3362=cut
3363*/
3364
3365void
3366Perl_gv_try_downgrade(pTHX_ GV *gv)
3367{
3368 HV *stash;
3369 CV *cv;
3370 HEK *namehek;
3371 SV **gvp;
3372 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3373
3374 /* XXX Why and where does this leave dangling pointers during global
3375 destruction? */
627364f1 3376 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3377
2867cdbc 3378 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3379 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3380 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3381 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3382 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3383 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3384 return;
2be08ad1
FC		 3385 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3386 return;
803f2748
DM		 3387 if (SvMAGICAL(gv)) {
3388 MAGIC *mg;
3389 /* only backref magic is allowed */
3390 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3391 return;
3392 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3393 if (mg->mg_type != PERL_MAGIC_backref)
3394 return;
3395 }
3396 }
2867cdbc
Z		 3397 cv = GvCV(gv);
3398 if (!cv) {
3399 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3400 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3401 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760
Z		 3402 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3403 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3404 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3405 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3406 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3407 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3408 *gvp == (SV*)gv) {
3409 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3410 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3411 SvREFCNT(gv) = 0;
3412 sv_clear((SV*)gv);
3413 SvREFCNT(gv) = 1;
70e5f2b5 3414 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z		 3415 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3416 STRUCT_OFFSET(XPVIV, xiv_iv));
3417 SvRV_set(gv, value);
3418 }
3419}
3420
9e3fb20c
FC		 3421GV *
3422Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3423{
3424 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3425 GV * const *gvp;
3426 PERL_ARGS_ASSERT_GV_OVERRIDE;
3427 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3428 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3429 gv = gvp ? *gvp : NULL;
3430 if (gv && !isGV(gv)) {
3431 if (!SvPCS_IMPORTED(gv)) return NULL;
3432 gv_init(gv, PL_globalstash, name, len, 0);
3433 return gv;
3434 }
3435 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3436}
3437
4aaa4757
FC		 3438#include "XSUB.h"
3439
3440static void
3441core_xsub(pTHX_ CV* cv)
3442{
3443 Perl_croak(aTHX_
3444 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3445 );
3446}
3447
f7461760 3448/*
66610fdd
RGS		 3449 * Local variables:
3450 * c-indentation-style: bsd
3451 * c-basic-offset: 4
14d04a33 3452 * indent-tabs-mode: nil
66610fdd
RGS		 3453 * End:
3454 *
14d04a33 3455 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3456 */
Unnamed repository; edit this file 'description' to name the repository.