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Also fix wince for caretx after e2051532106.
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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));
42d0e0b7 356 default: NOOP;
5c1f4d79 357 }
756cb477
NC		 358 SvRV_set(gv, NULL);
359 SvROK_off(gv);
360 }
463ee0b2 361
3b6733bf
NC		 362
363 if (old_type < SVt_PVGV) {
364 if (old_type >= SVt_PV)
365 SvCUR_set(gv, 0);
ad64d0ec 366 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 367 }
55d729e4
GS		 368 if (SvLEN(gv)) {
369 if (proto) {
f880fe2f 370 SvPV_set(gv, NULL);
b162af07 371 SvLEN_set(gv, 0);
55d729e4
GS		 372 SvPOK_off(gv);
373 } else
94010e71 374 Safefree(SvPVX_mutable(gv));
55d729e4 375 }
2e5b91de
NC		 376 SvIOK_off(gv);
377 isGV_with_GP_on(gv);
12816592 378
c43ae56f 379 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 380 GvSTASH(gv) = stash;
381 if (stash)
ad64d0ec 382 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 383 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 384 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
385 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 386 if (doproto) {
e3d2b9e7 387 CV *cv;
756cb477
NC		 388 if (has_constant) {
389 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 390 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 391 /* In case op.c:S_process_special_blocks stole it: */
392 if (!GvCV(gv))
c43ae56f 393 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 394 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 395 /* If this reference was a copy of another, then the subroutine
396 must have been "imported", by a Perl space assignment to a GV
397 from a reference to CV. */
398 if (exported_constant)
399 GvIMPORTED_CV_on(gv);
186a5ba8 400 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 401 } else {
186a5ba8 402 cv = newSTUB(gv,1);
756cb477 403 }
55d729e4 404 if (proto) {
e3d2b9e7 405 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 406 SV_HAS_TRAILING_NUL);
e0260a5b 407 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 408 }
409 }
463ee0b2
LW		 410}
411
76e3520e 412STATIC void
e6066781 413S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 414{
e6066781 415 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 416
a0d0e21e
LW		 417 switch (sv_type) {
418 case SVt_PVIO:
419 (void)GvIOn(gv);
420 break;
421 case SVt_PVAV:
422 (void)GvAVn(gv);
423 break;
424 case SVt_PVHV:
425 (void)GvHVn(gv);
426 break;
c69033f2
NC		 427#ifdef PERL_DONT_CREATE_GVSV
428 case SVt_NULL:
429 case SVt_PVCV:
430 case SVt_PVFM:
e654831b 431 case SVt_PVGV:
c69033f2
NC		 432 break;
433 default:
dbdce04c
NC		 434 if(GvSVn(gv)) {
435 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
436 If we just cast GvSVn(gv) to void, it ignores evaluating it for
437 its side effect */
438 }
c69033f2 439#endif
a0d0e21e
LW		 440 }
441}
442
0f8d4b5e
FC		 443static void core_xsub(pTHX_ CV* cv);
444
445static GV *
446S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 447 const char * const name, const STRLEN len)
0f8d4b5e
FC		 448{
449 const int code = keyword(name, len, 1);
450 static const char file[] = __FILE__;
97021f77 451 CV *cv, *oldcompcv = NULL;
0f8d4b5e 452 int opnum = 0;
0f8d4b5e 453 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 454 COP *oldcurcop = NULL;
455 yy_parser *oldparser = NULL;
456 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 457
458 assert(gv || stash);
459 assert(name);
0f8d4b5e 460
88b892d8
FC		 461 if (!code) return NULL; /* Not a keyword */
462 switch (code < 0 ? -code : code) {
0f8d4b5e 463 /* no support for \&CORE::infix;
d885f758 464 no support for funcs that do not parse like funcs */
88b892d8
FC		 465 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
466 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp: case KEY_CORE :
eb31eb35 467 case KEY_default : case KEY_DESTROY:
88b892d8 468 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 469 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 470 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 471 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 472 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
473 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
474 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 475 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 476 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 477 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 478 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 479 case KEY_state: case KEY_sub :
46bef06f 480 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 481 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
482 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 483 return NULL;
484 case KEY_chdir:
eb31eb35 485 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 486 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 487 case KEY_keys:
488 case KEY_lstat:
489 case KEY_pop:
490 case KEY_push:
491 case KEY_shift:
a99f2ca2 492 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 493 case KEY_stat:
494 case KEY_system:
495 case KEY_truncate: case KEY_unlink:
496 case KEY_unshift:
497 case KEY_values:
498 ampable = FALSE;
499 }
500 if (!gv) {
501 gv = (GV *)newSV(0);
502 gv_init(gv, stash, name, len, TRUE);
503 }
7e68c38b 504 GvMULTI_on(gv);
0f8d4b5e
FC		 505 if (ampable) {
506 ENTER;
507 oldcurcop = PL_curcop;
508 oldparser = PL_parser;
509 lex_start(NULL, NULL, 0);
510 oldcompcv = PL_compcv;
511 PL_compcv = NULL; /* Prevent start_subparse from setting
512 CvOUTSIDE. */
513 oldsavestack_ix = start_subparse(FALSE,0);
514 cv = PL_compcv;
515 }
516 else {
517 /* Avoid calling newXS, as it calls us, and things start to
518 get hairy. */
519 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
520 GvCV_set(gv,cv);
521 GvCVGEN(gv) = 0;
522 mro_method_changed_in(GvSTASH(gv));
523 CvISXSUB_on(cv);
524 CvXSUB(cv) = core_xsub;
525 }
526 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
527 from PL_curcop. */
528 (void)gv_fetchfile(file);
529 CvFILE(cv) = (char *)file;
530 /* XXX This is inefficient, as doing things this order causes
531 a prototype check in newATTRSUB. But we have to do
532 it this order as we need an op number before calling
533 new ATTRSUB. */
534 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 535 if (stash)
73c02f15 536 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 537 if (ampable) {
4428fb0e
TC		 538#ifdef DEBUGGING
539 CV *orig_cv = cv;
540#endif
0f8d4b5e 541 CvLVALUE_on(cv);
4428fb0e
TC		 542 /* newATTRSUB will free the CV and return NULL if we're still
543 compiling after a syntax error */
544 if ((cv = newATTRSUB_flags(
7e68c38b 545 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 546 NULL,NULL,
547 coresub_op(
548 opnum
549 ? newSVuv((UV)opnum)
550 : newSVpvn(name,len),
551 code, opnum
7e68c38b
FC		 552 ),
553 1
4428fb0e
TC		 554 )) != NULL) {
555 assert(GvCV(gv) == orig_cv);
556 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
557 && opnum != OP_UNDEF)
558 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
559 }
0f8d4b5e
FC		 560 LEAVE;
561 PL_parser = oldparser;
562 PL_curcop = oldcurcop;
563 PL_compcv = oldcompcv;
564 }
4428fb0e
TC		 565 if (cv) {
566 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
567 cv_set_call_checker(
568 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
569 );
570 SvREFCNT_dec(opnumsv);
571 }
572
0f8d4b5e
FC		 573 return gv;
574}
575
954c1994 576/*
6c53d59b
FC		 577=for apidoc gv_fetchmeth
578
579Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
580
e6919483
BF		 581=for apidoc gv_fetchmeth_sv
582
583Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
584of an SV instead of a string/length pair.
585
586=cut
587*/
588
589GV *
590Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
591{
592 char *namepv;
593 STRLEN namelen;
594 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
595 namepv = SvPV(namesv, namelen);
596 if (SvUTF8(namesv))
597 flags |= SVf_UTF8;
598 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
599}
600
601/*
602=for apidoc gv_fetchmeth_pv
603
604Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
605instead of a string/length pair.
606
607=cut
608*/
609
610GV *
611Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
612{
613 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
614 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
615}
616
617/*
618=for apidoc gv_fetchmeth_pvn
954c1994
GS		 619
620Returns the glob with the given C<name> and a defined subroutine or
621C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 622accessible via @ISA and UNIVERSAL::.
954c1994
GS		 623
624The argument C<level> should be either 0 or -1. If C<level==0>, as a
625side-effect creates a glob with the given C<name> in the given C<stash>
626which in the case of success contains an alias for the subroutine, and sets
e1a479c5 627up caching info for this glob.
954c1994 628
aae43805
FC		 629The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
630
631GV_SUPER indicates that we want to look up the method in the superclasses
632of the C<stash>.
e6919483 633
aae43805 634The
954c1994 635GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 636visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 637the GV directly; instead, you should use the method's CV, which can be
b267980d 638obtained from the GV with the C<GvCV> macro.
954c1994
GS		 639
640=cut
641*/
642
e1a479c5
BB		 643/* NOTE: No support for tied ISA */
644
79072805 645GV *
e6919483 646Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 647{
97aff369 648 dVAR;
463ee0b2 649 GV** gvp;
e1a479c5
BB		 650 AV* linear_av;
651 SV** linear_svp;
652 SV* linear_sv;
aae43805 653 HV* cstash, *cachestash;
e1a479c5
BB		 654 GV* candidate = NULL;
655 CV* cand_cv = NULL;
e1a479c5 656 GV* topgv = NULL;
bfcb3514 657 const char *hvname;
e1a479c5
BB		 658 I32 create = (level >= 0) ? 1 : 0;
659 I32 items;
e1a479c5 660 U32 topgen_cmp;
04f3bf56 661 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 662
e6919483 663 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 664
af09ea45
IK		 665 /* UNIVERSAL methods should be callable without a stash */
666 if (!stash) {
e1a479c5 667 create = 0; /* probably appropriate */
da51bb9b 668 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 669 return 0;
670 }
671
e1a479c5
BB		 672 assert(stash);
673
bfcb3514
NC		 674 hvname = HvNAME_get(stash);
675 if (!hvname)
e1a479c5 676 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 677
e1a479c5
BB		 678 assert(hvname);
679 assert(name);
463ee0b2 680
aae43805
FC		 681 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
682 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 683
dd69841b 684 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 685
aae43805 686 if (flags & GV_SUPER) {
1a33a059
FC		 687 if (!HvAUX(stash)->xhv_mro_meta->super)
688 HvAUX(stash)->xhv_mro_meta->super = newHV();
689 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 690 }
691 else cachestash = stash;
692
e1a479c5 693 /* check locally for a real method or a cache entry */
aae43805
FC		 694 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
695 create);
e1a479c5
BB		 696 if(gvp) {
697 topgv = *gvp;
0f8d4b5e 698 have_gv:
e1a479c5
BB		 699 assert(topgv);
700 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 701 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 702 if ((cand_cv = GvCV(topgv))) {
703 /* If genuine method or valid cache entry, use it */
704 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
705 return topgv;
706 }
707 else {
708 /* stale cache entry, junk it and move on */
e7881358 709 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 710 GvCV_set(topgv, NULL);
711 cand_cv = NULL;
e1a479c5
BB		 712 GvCVGEN(topgv) = 0;
713 }
714 }
715 else if (GvCVGEN(topgv) == topgen_cmp) {
716 /* cache indicates no such method definitively */
717 return 0;
718 }
aae43805
FC		 719 else if (stash == cachestash
720 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 721 && strnEQ(hvname, "CORE", 4)
87566176 722 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 723 goto have_gv;
463ee0b2 724 }
79072805 725
aae43805 726 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 727 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
728 items = AvFILLp(linear_av); /* no +1, to skip over self */
729 while (items--) {
730 linear_sv = *linear_svp++;
731 assert(linear_sv);
732 cstash = gv_stashsv(linear_sv, 0);
733
dd69841b 734 if (!cstash) {
ecad31f0 735 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 736 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 737 SVfARG(linear_sv),
d0c0e7dd 738 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 739 continue;
740 }
9607fc9c 741
e1a479c5
BB		 742 assert(cstash);
743
c60dbbc3 744 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 745 if (!gvp) {
746 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
747 const char *hvname = HvNAME(cstash); assert(hvname);
748 if (strnEQ(hvname, "CORE", 4)
749 && (candidate =
87566176 750 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 751 ))
752 goto have_candidate;
753 }
754 continue;
755 }
756 else candidate = *gvp;
757 have_candidate:
e1a479c5 758 assert(candidate);
04f3bf56 759 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 760 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 761 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
762 /*
763 * Found real method, cache method in topgv if:
764 * 1. topgv has no synonyms (else inheritance crosses wires)
765 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
766 */
767 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 768 CV *old_cv = GvCV(topgv);
769 SvREFCNT_dec(old_cv);
e1a479c5 770 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 771 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 772 GvCVGEN(topgv) = topgen_cmp;
773 }
774 return candidate;
775 }
776 }
9607fc9c 777
e1a479c5
BB		 778 /* Check UNIVERSAL without caching */
779 if(level == 0 || level == -1) {
aae43805 780 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB		 781 if(candidate) {
782 cand_cv = GvCV(candidate);
783 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 784 CV *old_cv = GvCV(topgv);
785 SvREFCNT_dec(old_cv);
e1a479c5 786 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 787 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 788 GvCVGEN(topgv) = topgen_cmp;
789 }
790 return candidate;
791 }
792 }
793
794 if (topgv && GvREFCNT(topgv) == 1) {
795 /* cache the fact that the method is not defined */
796 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 797 }
798
79072805
LW		 799 return 0;
800}
801
954c1994 802/*
460e5730
FC		 803=for apidoc gv_fetchmeth_autoload
804
805This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
806parameter.
807
d21989ed 808=for apidoc gv_fetchmeth_sv_autoload
611c1e95 809
d21989ed
BF		 810Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
811of an SV instead of a string/length pair.
812
813=cut
814*/
815
816GV *
817Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
818{
819 char *namepv;
820 STRLEN namelen;
821 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
822 namepv = SvPV(namesv, namelen);
823 if (SvUTF8(namesv))
824 flags |= SVf_UTF8;
825 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
826}
827
828/*
829=for apidoc gv_fetchmeth_pv_autoload
830
831Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
832instead of a string/length pair.
833
834=cut
835*/
836
837GV *
838Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
839{
840 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
841 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
842}
843
844/*
845=for apidoc gv_fetchmeth_pvn_autoload
846
847Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ		 848Returns a glob for the subroutine.
849
850For an autoloaded subroutine without a GV, will create a GV even
851if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
852of the result may be zero.
853
d21989ed
BF		 854Currently, the only significant value for C<flags> is SVf_UTF8.
855
611c1e95
IZ		 856=cut
857*/
858
859GV *
d21989ed 860Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 861{
499321d3 862 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 863
d21989ed 864 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 865
611c1e95 866 if (!gv) {
611c1e95
IZ		 867 CV *cv;
868 GV **gvp;
869
870 if (!stash)
6136c704 871 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 872 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 873 return NULL;
d21989ed 874 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 875 return NULL;
611c1e95
IZ		 876 cv = GvCV(gv);
877 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 878 return NULL;
611c1e95
IZ		 879 /* Have an autoload */
880 if (level < 0) /* Cannot do without a stub */
d21989ed 881 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 882 gvp = (GV**)hv_fetch(stash, name,
883 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 884 if (!gvp)
6136c704 885 return NULL;
611c1e95
IZ		 886 return *gvp;
887 }
888 return gv;
889}
890
891/*
954c1994
GS		 892=for apidoc gv_fetchmethod_autoload
893
894Returns the glob which contains the subroutine to call to invoke the method
895on the C<stash>. In fact in the presence of autoloading this may be the
896glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 897already setup.
954c1994
GS		 898
899The third parameter of C<gv_fetchmethod_autoload> determines whether
900AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 901means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 902Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 903with a non-zero C<autoload> parameter.
954c1994 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 }
c8416c26 1126 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, is_utf8)))
a0714e2c 1127 return NULL;
dc848c6f 1128 cv = GvCV(gv);
1129
adb5a9ae 1130 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1131 return NULL;
ed850460 1132
dc848c6f 1133 /*
1134 * Inheriting AUTOLOAD for non-methods works ... for now.
1135 */
0eeb01b9
FC		 1136 if (
1137 !(flags & GV_AUTOLOAD_ISMETHOD)
1138 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1139 )
d1d15184 1140 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1141 "Use of inherited AUTOLOAD for non-method %"SVf
1142 "::%"UTF8f"() is deprecated",
ecad31f0 1143 SVfARG(packname),
b17a0679 1144 UTF8fARG(is_utf8, len, name));
44a8e56a 1145
aed2304a 1146 if (CvISXSUB(cv)) {
bb619f37
FC		 1147 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1148 * and split that value on the last '::', pass along the same data
1149 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1150 *
1151 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1152 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1153 * type. Since SvPVX has been documented as returning the sub name
1154 * for a long time, but not as returning the prototype, we have
1155 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1156 * elsewhere.
1157 *
1158 * We put the prototype in the same allocated buffer, but after
1159 * the sub name. The SvPOK flag indicates the presence of a proto-
1160 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1161 * If both flags are on, then SvLEN is used to indicate the end of
1162 * the prototype (artificially lower than what is actually allo-
1163 * cated), at the risk of having to reallocate a few bytes unneces-
1164 * sarily--but that should happen very rarely, if ever.
1165 *
1166 * We use SvUTF8 for both prototypes and sub names, so if one is
1167 * UTF8, the other must be upgraded.
adb5a9ae 1168 */
c68d9564 1169 CvSTASH_set(cv, stash);
8fa6a409 1170 if (SvPOK(cv)) { /* Ouch! */
e7881358 1171 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1172 STRLEN ulen;
1173 const char *proto = CvPROTO(cv);
1174 assert(proto);
1175 if (SvUTF8(cv))
1176 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1177 ulen = SvCUR(tmpsv);
1178 SvCUR(tmpsv)++; /* include null in string */
1179 sv_catpvn_flags(
1180 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1181 );
1182 SvTEMP_on(tmpsv); /* Allow theft */
1183 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1184 SvTEMP_off(tmpsv);
e7881358 1185 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1186 SvLEN(cv) = SvCUR(cv) + 1;
1187 SvCUR(cv) = ulen;
1188 }
1189 else {
1190 sv_setpvn((SV *)cv, name, len);
1191 SvPOK_off(cv);
1192 if (is_utf8)
c8416c26 1193 SvUTF8_on(cv);
8fa6a409
FC		 1194 else SvUTF8_off(cv);
1195 }
1196 CvAUTOLOAD_on(cv);
adb5a9ae 1197 }
adb5a9ae 1198
44a8e56a 1199 /*
1200 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1201 * The subroutine's original name may not be "AUTOLOAD", so we don't
1202 * use that, but for lack of anything better we will use the sub's
1203 * original package to look up $AUTOLOAD.
1204 */
1205 varstash = GvSTASH(CvGV(cv));
5c7983e5 1206 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1207 ENTER;
1208
c69033f2 1209 if (!isGV(vargv)) {
04ec7e59 1210 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1211#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1212 GvSV(vargv) = newSV(0);
c69033f2
NC		 1213#endif
1214 }
3d35f11b 1215 LEAVE;
e203899d 1216 varsv = GvSVn(vargv);
4bac9ae4
CS		 1217 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1218 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1219 sv_setsv(varsv, packname);
396482e1 1220 sv_catpvs(varsv, "::");
d40bf27b
NC		 1221 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1222 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1223 sv_catpvn_flags(
1224 varsv, name, len,
5bcd1ef4 1225 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1226 );
c8416c26
BF		 1227 if (is_utf8)
1228 SvUTF8_on(varsv);
a0d0e21e
LW		 1229 return gv;
1230}
1231
44a2ac75
YO		 1232
1233/* require_tie_mod() internal routine for requiring a module
486ec47a 1234 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1235 *
1236 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1237 * "varpv" holds the name of the var, used for error messages.
1238 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1239 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1240 * are working reasonably close to as expected.
1241 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1242 * For the protection of $! to work (it is set by this routine)
1243 * the sv slot must already be magicalized.
d2c93421 1244 */
44a2ac75
YO		 1245STATIC HV*
1246S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1247{
27da23d5 1248 dVAR;
da51bb9b 1249 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1250
7918f24d
NC		 1251 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1252
0ea03996 1253 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1254 SV *module = newSVsv(namesv);
1255 char varname = *varpv; /* varpv might be clobbered by load_module,
1256 so save it. For the moment it's always
1257 a single char. */
b82b06b8 1258 const char type = varname == '[' ? '$' : '%';
d2c93421 1259 dSP;
d2c93421 1260 ENTER;
600beb2e 1261 SAVEFREESV(namesv);
44a2ac75 1262 if ( flags & 1 )
45cbc99a 1263 save_scalar(gv);
cac54379 1264 PUSHSTACKi(PERLSI_MAGIC);
45cbc99a 1265 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
cac54379 1266 POPSTACK;
da51bb9b 1267 stash = gv_stashsv(namesv, 0);
44a2ac75 1268 if (!stash)
b82b06b8
FC		 1269 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1270 type, varname, SVfARG(namesv));
45cbc99a 1271 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1272 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1273 type, varname, SVfARG(namesv), methpv);
600beb2e 1274 LEAVE;
d2c93421 1275 }
e7881358 1276 else SvREFCNT_dec_NN(namesv);
44a2ac75 1277 return stash;
d2c93421
RH		 1278}
1279
954c1994
GS		 1280/*
1281=for apidoc gv_stashpv
1282
da51bb9b 1283Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1284determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1285
1286=cut
1287*/
1288
a0d0e21e 1289HV*
864dbfa3 1290Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1291{
7918f24d 1292 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1293 return gv_stashpvn(name, strlen(name), create);
1294}
1295
bc96cb06
SH		 1296/*
1297=for apidoc gv_stashpvn
1298
da51bb9b
NC		 1299Returns a pointer to the stash for a specified package. The C<namelen>
1300parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1301to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1302created if it does not already exist. If the package does not exist and
1303C<flags> is 0 (or any other setting that does not create packages) then NULL
1304is returned.
1305
566a4718
YO		 1306Flags may be one of:
1307
1308 GV_ADD
1309 SVf_UTF8
1310 GV_NOADD_NOINIT
1311 GV_NOINIT
1312 GV_NOEXPAND
1313 GV_ADDMG
1314
1315The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH		 1316
1317=cut
1318*/
1319
dc437b57 1320HV*
da51bb9b 1321Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1322{
0cea0058 1323 char smallbuf[128];
46fc3d4c 1324 char *tmpbuf;
a0d0e21e
LW		 1325 HV *stash;
1326 GV *tmpgv;
add0ecde 1327 U32 tmplen = namelen + 2;
dc437b57 1328
7918f24d
NC		 1329 PERL_ARGS_ASSERT_GV_STASHPVN;
1330
add0ecde 1331 if (tmplen <= sizeof smallbuf)
46fc3d4c 1332 tmpbuf = smallbuf;
1333 else
add0ecde
VP		 1334 Newx(tmpbuf, tmplen, char);
1335 Copy(name, tmpbuf, namelen, char);
1336 tmpbuf[namelen] = ':';
1337 tmpbuf[namelen+1] = ':';
1338 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1339 if (tmpbuf != smallbuf)
1340 Safefree(tmpbuf);
a0d0e21e 1341 if (!tmpgv)
da51bb9b 1342 return NULL;
a0d0e21e 1343 stash = GvHV(tmpgv);
1f656fcf 1344 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1345 assert(stash);
1f656fcf 1346 if (!HvNAME_get(stash)) {
0be4d16f 1347 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1348
1349 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1350 /* If the containing stash has multiple effective
1351 names, see that this one gets them, too. */
1352 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1353 mro_package_moved(stash, NULL, tmpgv, 1);
1354 }
a0d0e21e 1355 return stash;
463ee0b2
LW		 1356}
1357
954c1994
GS		 1358/*
1359=for apidoc gv_stashsv
1360
da51bb9b 1361Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS		 1362
1363=cut
1364*/
1365
a0d0e21e 1366HV*
da51bb9b 1367Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1368{
dc437b57 1369 STRLEN len;
9d4ba2ae 1370 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC		 1371
1372 PERL_ARGS_ASSERT_GV_STASHSV;
1373
0be4d16f 1374 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW		 1375}
1376
1377
463ee0b2 1378GV *
fe9845cc 1379Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1380 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1381 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1382}
1383
1384GV *
fe9845cc 1385Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1386 STRLEN len;
77cb3b01
FC		 1387 const char * const nambeg =
1388 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1389 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1390 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1391}
1392
90aeefb4 1393PERL_STATIC_INLINE void
290a1700 1394S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1395{
1396 AV* av;
1397
1398 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1399
1400 av = GvAVn(gv);
1401 GvMULTI_on(gv);
1402 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1403 NULL, 0);
ad7cce9f
FR		 1404}
1405
90aeefb4
BF		 1406/* This function grabs name and tries to split a stash and glob
1407 * from its contents. TODO better description, comments
1408 *
1409 * If the function returns TRUE and 'name == name_end', then
1410 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1411 */
1412PERL_STATIC_INLINE bool
1413S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1414 STRLEN *len, const char *nambeg, STRLEN full_len,
1415 const U32 is_utf8, const I32 add)
1416{
1417 const char *name_cursor;
1418 const char *const name_end = nambeg + full_len;
1419 const char *const name_em1 = name_end - 1;
1420
1421 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1422
1423 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1424 /* accidental stringify on a GV? */
1425 (*name)++;
1426 }
1427
1428 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1429 if (name_cursor < name_em1 &&
1430 ((*name_cursor == ':' && name_cursor[1] == ':')
1431 || *name_cursor == '\''))
1432 {
1433 if (!*stash)
1434 *stash = PL_defstash;
1435 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1436 return FALSE;
1437
1438 *len = name_cursor - *name;
1439 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1440 const char *key;
1441 GV**gvp;
1442 if (*name_cursor == ':') {
1443 key = *name;
1444 *len += 2;
1445 }
1446 else {
1447 char *tmpbuf;
1448 Newx(tmpbuf, *len+2, char);
1449 Copy(*name, tmpbuf, *len, char);
1450 tmpbuf[(*len)++] = ':';
1451 tmpbuf[(*len)++] = ':';
1452 key = tmpbuf;
1453 }
1454 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -(*len) : *len, add);
1455 *gv = gvp ? *gvp : NULL;
1456 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1457 if (SvTYPE(*gv) != SVt_PVGV)
1458 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1459 else
1460 GvMULTI_on(*gv);
1461 }
1462 if (key != *name)
1463 Safefree(key);
1464 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1465 return FALSE;
1466
1467 if (!(*stash = GvHV(*gv))) {
1468 *stash = GvHV(*gv) = newHV();
1469 if (!HvNAME_get(*stash)) {
1470 if (GvSTASH(*gv) == PL_defstash && *len == 6
1471 && strnEQ(*name, "CORE", 4))
1472 hv_name_set(*stash, "CORE", 4, 0);
1473 else
1474 hv_name_set(
1475 *stash, nambeg, name_cursor-nambeg, is_utf8
1476 );
1477 /* If the containing stash has multiple effective
1478 names, see that this one gets them, too. */
1479 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1480 mro_package_moved(*stash, NULL, *gv, 1);
1481 }
1482 }
1483 else if (!HvNAME_get(*stash))
1484 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1485 }
1486
1487 if (*name_cursor == ':')
1488 name_cursor++;
1489 *name = name_cursor+1;
1490 if (*name == name_end) {
1491 if (!*gv)
1492 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1493 return TRUE;
1494 }
1495 }
1496 }
1497 *len = name_cursor - *name;
1498 return TRUE;
1499}
1500
536d1a88 1501/* Checks if an unqualified name is in the main stash */
90aeefb4 1502PERL_STATIC_INLINE bool
536d1a88 1503S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1504{
536d1a88 1505 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1506
90aeefb4 1507 /* If it's an alphanumeric variable */
536d1a88 1508 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1509 /* Some "normal" variables are always in main::,
1510 * like INC or STDOUT.
1511 */
1512 switch (len) {
1513 case 1:
1514 if (*name == '_')
536d1a88 1515 return TRUE;
90aeefb4
BF		 1516 break;
1517 case 3:
1518 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1519 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1520 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1521 return TRUE;
90aeefb4
BF		 1522 break;
1523 case 4:
1524 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1525 && name[3] == 'V')
536d1a88 1526 return TRUE;
90aeefb4
BF		 1527 break;
1528 case 5:
1529 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1530 && name[3] == 'I' && name[4] == 'N')
536d1a88 1531 return TRUE;
90aeefb4
BF		 1532 break;
1533 case 6:
1534 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1535 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1536 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1537 return TRUE;
90aeefb4
BF		 1538 break;
1539 case 7:
1540 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1541 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1542 && name[6] == 'T')
536d1a88 1543 return TRUE;
90aeefb4
BF		 1544 break;
1545 }
536d1a88
BF		 1546 }
1547 /* *{""}, or a special variable like $@ */
1548 else
1549 return TRUE;
1550
1551 return FALSE;
1552}
1553
1554
1555/* This function is called if parse_gv_stash_name() failed to
1556 * find a stash, or if GV_NOTQUAL or an empty name was passed
1557 * to gv_fetchpvn_flags.
1558 *
1559 * It returns FALSE if the default stash can't be found nor created,
1560 * which might happen during global destruction.
1561 */
1562PERL_STATIC_INLINE bool
1563S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1564 const U32 is_utf8, const I32 add,
1565 const svtype sv_type)
1566{
1567 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1568
1569 /* No stash in name, so see how we can default */
90aeefb4 1570
536d1a88
BF		 1571 if ( gv_is_in_main(name, len, is_utf8) ) {
1572 *stash = PL_defstash;
1573 }
1574 else {
1575 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1576 *stash = PL_curstash;
1577 if (add && (PL_hints & HINT_STRICT_VARS) &&
1578 sv_type != SVt_PVCV &&
1579 sv_type != SVt_PVGV &&
1580 sv_type != SVt_PVFM &&
1581 sv_type != SVt_PVIO &&
1582 !(len == 1 && sv_type == SVt_PV &&
1583 (*name == 'a' || *name == 'b')) )
1584 {
1585 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -len : len,0);
1586 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1587 SvTYPE(*gvp) != SVt_PVGV)
1588 {
1589 *stash = NULL;
1590 }
1591 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1592 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1593 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1594 {
1595 /* diag_listed_as: Variable "%s" is not imported%s */
1596 Perl_ck_warner_d(
1597 aTHX_ packWARN(WARN_MISC),
1598 "Variable \"%c%"UTF8f"\" is not imported",
1599 sv_type == SVt_PVAV ? '@' :
1600 sv_type == SVt_PVHV ? '%' : '$',
1601 UTF8fARG(is_utf8, len, name));
1602 if (GvCVu(*gvp))
1603 Perl_ck_warner_d(
1604 aTHX_ packWARN(WARN_MISC),
1605 "\t(Did you mean &%"UTF8f" instead?)\n",
1606 UTF8fARG(is_utf8, len, name)
1607 );
1608 *stash = NULL;
1609 }
1610 }
1611 }
1612 else {
1613 /* Use the current op's stash */
1614 *stash = CopSTASH(PL_curcop);
1615 }
1616 }
90aeefb4
BF		 1617
1618 if (!*stash) {
1619 if (add && !PL_in_clean_all) {
1620 SV * const err = Perl_mess(aTHX_
1621 "Global symbol \"%s%"UTF8f
1622 "\" requires explicit package name",
1623 (sv_type == SVt_PV ? "$"
1624 : sv_type == SVt_PVAV ? "@"
1625 : sv_type == SVt_PVHV ? "%"
1626 : ""), UTF8fARG(is_utf8, len, name));
1627 GV *gv;
1628 if (is_utf8)
1629 SvUTF8_on(err);
1630 qerror(err);
cd164bf8
BF		 1631 /* To maintain the output of errors after the strict exception
1632 * above, and to keep compat with older releases, rather than
1633 * placing the variables in the pad, we place
1634 * them in the <none>:: stash.
1635 */
90aeefb4
BF		 1636 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1637 if (!gv) {
1638 /* symbol table under destruction */
1639 return FALSE;
1640 }
1641 *stash = GvHV(gv);
1642 }
1643 else
1644 return FALSE;
1645 }
1646
1647 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1648 return FALSE;
1649
1650 return TRUE;
1651}
1652
930867a8
BF		 1653/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1654 * a new GV.
1655 * Note that it does not insert the GV into the stash prior to
1656 * magicalization, which some variables require need in order
1657 * to work (like $[, %+, %-, %!), so callers must take care of
1658 * that beforehand.
1659 *
1660 * The return value has a specific meaning for gv_fetchpvn_flags:
1661 * If it returns true, and the gv is empty, it indicates that its
1662 * refcount should be decreased.
1663 */
1664PERL_STATIC_INLINE bool
1665S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1666 bool addmg, const svtype sv_type)
79072805 1667{
960b831f 1668 SSize_t paren;
79072805 1669
930867a8 1670 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1671
44428a46 1672 if (stash != PL_defstash) { /* not the main stash */
5fdfd519 1673 /* We only have to check for three names here: EXPORT, ISA
4aaa4757
FC		 1674 and VERSION. All the others apply only to the main stash or to
1675 CORE (which is checked right after this). */
f4e68e82 1676 if (len > 2) {
b464bac0 1677 const char * const name2 = name + 1;
cc4c2da6 1678 switch (*name) {
cc4c2da6
NC		 1679 case 'E':
1680 if (strnEQ(name2, "XPORT", 5))
1681 GvMULTI_on(gv);
1682 break;
1683 case 'I':
44428a46 1684 if (strEQ(name2, "SA"))
290a1700 1685 gv_magicalize_isa(gv);
cc4c2da6 1686 break;
44428a46
FC		 1687 case 'V':
1688 if (strEQ(name2, "ERSION"))
1689 GvMULTI_on(gv);
1690 break;
4aaa4757
FC		 1691 default:
1692 goto try_core;
1693 }
930867a8 1694 return addmg;
4aaa4757
FC		 1695 }
1696 try_core:
1697 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1698 /* Avoid null warning: */
1699 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1700 if (strnEQ(stashname, "CORE", 4))
1701 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1702 }
1703 }
1704 else if (len > 1) {
1705#ifndef EBCDIC
1706 if (*name > 'V' ) {
1707 NOOP;
1708 /* Nothing else to do.
1709 The compiler will probably turn the switch statement into a
1710 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1711 the common case of lower case variable names. (On EBCDIC
1712 platforms, we can't just do:
1713 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1714 because cases like '\027' in the switch statement below are
1715 C1 (non-ASCII) controls on those platforms, so the remapping
1716 would make them larger than 'V')
1717 */
44428a46
FC		 1718 } else
1719#endif
1720 {
1721 const char * const name2 = name + 1;
1722 switch (*name) {
1723 case 'A':
1724 if (strEQ(name2, "RGV")) {
1725 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1726 }
1727 else if (strEQ(name2, "RGVOUT")) {
1728 GvMULTI_on(gv);
1729 }
1730 break;
1731 case 'E':
1732 if (strnEQ(name2, "XPORT", 5))
1733 GvMULTI_on(gv);
1734 break;
1735 case 'I':
1736 if (strEQ(name2, "SA")) {
290a1700 1737 gv_magicalize_isa(gv);
44428a46
FC		 1738 }
1739 break;
cc4c2da6
NC		 1740 case 'S':
1741 if (strEQ(name2, "IG")) {
1742 HV *hv;
1743 I32 i;
d525a7b2
NC		 1744 if (!PL_psig_name) {
1745 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1746 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1747 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1748 } else {
1749 /* I think that the only way to get here is to re-use an
1750 embedded perl interpreter, where the previous
1751 use didn't clean up fully because
1752 PL_perl_destruct_level was 0. I'm not sure that we
1753 "support" that, in that I suspect in that scenario
1754 there are sufficient other garbage values left in the
1755 interpreter structure that something else will crash
1756 before we get here. I suspect that this is one of
1757 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1758 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1759 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1760 }
1761 GvMULTI_on(gv);
1762 hv = GvHVn(gv);
a0714e2c 1763 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1764 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1765 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1766 if (init)
1767 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1768 }
1769 }
1770 break;
1771 case 'V':
1772 if (strEQ(name2, "ERSION"))
1773 GvMULTI_on(gv);
1774 break;
e5218da5
GA		 1775 case '\003': /* $^CHILD_ERROR_NATIVE */
1776 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1777 goto magicalize;
1778 break;
cc4c2da6
NC		 1779 case '\005': /* $^ENCODING */
1780 if (strEQ(name2, "NCODING"))
1781 goto magicalize;
1782 break;
9ebf26ad
FR		 1783 case '\007': /* $^GLOBAL_PHASE */
1784 if (strEQ(name2, "LOBAL_PHASE"))
1785 goto ro_magicalize;
1786 break;
8561ea1d
FC		 1787 case '\014': /* $^LAST_FH */
1788 if (strEQ(name2, "AST_FH"))
1789 goto ro_magicalize;
1790 break;
cde0cee5 1791 case '\015': /* $^MATCH */
960b831f
NC		 1792 if (strEQ(name2, "ATCH")) {
1793 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1794 goto storeparen;
1795 }
66230c86 1796 break;
cc4c2da6
NC		 1797 case '\017': /* $^OPEN */
1798 if (strEQ(name2, "PEN"))
1799 goto magicalize;
1800 break;
cde0cee5 1801 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1802 if (strEQ(name2, "REMATCH")) {
1803 paren = RX_BUFF_IDX_CARET_PREMATCH;
1804 goto storeparen;
1805 }
1806 if (strEQ(name2, "OSTMATCH")) {
1807 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1808 goto storeparen;
1809 }
9ebf26ad 1810 break;
cc4c2da6
NC		 1811 case '\024': /* ${^TAINT} */
1812 if (strEQ(name2, "AINT"))
1813 goto ro_magicalize;
1814 break;
7cebcbc0 1815 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1816 if (strEQ(name2, "NICODE"))
cc4c2da6 1817 goto ro_magicalize;
a0288114 1818 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1819 goto ro_magicalize;
e07ea26a
NC		 1820 if (strEQ(name2, "TF8CACHE"))
1821 goto magicalize;
cc4c2da6
NC		 1822 break;
1823 case '\027': /* $^WARNING_BITS */
1824 if (strEQ(name2, "ARNING_BITS"))
1825 goto magicalize;
1826 break;
1827 case '1':
1828 case '2':
1829 case '3':
1830 case '4':
1831 case '5':
1832 case '6':
1833 case '7':
1834 case '8':
1835 case '9':
85e6fe83 1836 {
2fdbfb4d
AB		 1837 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1838 this test */
1839 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC		 1840 const char *end = name + len;
1841 while (--end > name) {
930867a8
BF		 1842 if (!isDIGIT(*end))
1843 return addmg;
cc4c2da6 1844 }
960b831f
NC		 1845 paren = strtoul(name, NULL, 10);
1846 goto storeparen;
1d7c1841 1847 }
dc437b57 1848 }
93a17b20 1849 }
392db708
NC		 1850 } else {
1851 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1852 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1853 switch (*name) {
6361f656 1854 case '&': /* $& */
960b831f
NC		 1855 paren = RX_BUFF_IDX_FULLMATCH;
1856 goto sawampersand;
6361f656 1857 case '`': /* $` */
960b831f
NC		 1858 paren = RX_BUFF_IDX_PREMATCH;
1859 goto sawampersand;
6361f656 1860 case '\'': /* $' */
960b831f
NC		 1861 paren = RX_BUFF_IDX_POSTMATCH;
1862 sawampersand:
1a904fc8 1863#ifdef PERL_SAWAMPERSAND
a289ef89 1864 if (!(
cc4c2da6
NC		 1865 sv_type == SVt_PVAV ||
1866 sv_type == SVt_PVHV ||
1867 sv_type == SVt_PVCV ||
1868 sv_type == SVt_PVFM ||
1869 sv_type == SVt_PVIO
d3b97530
DM		 1870 )) { PL_sawampersand |=
1871 (*name == '`')
1872 ? SAWAMPERSAND_LEFT
1873 : (*name == '&')
1874 ? SAWAMPERSAND_MIDDLE
1875 : SAWAMPERSAND_RIGHT;
1876 }
1a904fc8 1877#endif
960b831f 1878 goto storeparen;
e91d8259
NC		 1879 case '1': /* $1 */
1880 case '2': /* $2 */
1881 case '3': /* $3 */
1882 case '4': /* $4 */
1883 case '5': /* $5 */
1884 case '6': /* $6 */
1885 case '7': /* $7 */
1886 case '8': /* $8 */
1887 case '9': /* $9 */
960b831f
NC		 1888 paren = *name - '0';
1889
1890 storeparen:
e91d8259
NC		 1891 /* Flag the capture variables with a NULL mg_ptr
1892 Use mg_len for the array index to lookup. */
960b831f 1893 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1894 break;
cc4c2da6 1895
6361f656 1896 case ':': /* $: */
c69033f2 1897 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 1898 goto magicalize;
1899
6361f656 1900 case '?': /* $? */
ff0cee69 1901#ifdef COMPLEX_STATUS
c69033f2 1902 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1903#endif
cc4c2da6 1904 goto magicalize;
ff0cee69 1905
6361f656 1906 case '!': /* $! */
67261566 1907 GvMULTI_on(gv);
44a2ac75 1908 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1909
ad64d0ec 1910 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1911
44a2ac75 1912 /* magicalization must be done before require_tie_mod is called */
67261566 1913 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 1914 {
44a2ac75 1915 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 1916 addmg = FALSE;
ffdb8bcd 1917 }
d2c93421 1918
6cef1e77 1919 break;
6361f656
AB		 1920 case '-': /* $- */
1921 case '+': /* $+ */
44a2ac75
YO		 1922 GvMULTI_on(gv); /* no used once warnings here */
1923 {
44a2ac75 1924 AV* const av = GvAVn(gv);
ad64d0ec 1925 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1926
ad64d0ec
NC		 1927 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1928 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1929 if (avc)
44a2ac75 1930 SvREADONLY_on(GvSVn(gv));
44a2ac75 1931 SvREADONLY_on(av);
67261566
YO		 1932
1933 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 1934 {
192b9cd1 1935 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 1936 addmg = FALSE;
213084e4 1937 }
67261566 1938
80305961 1939 break;
cc4c2da6 1940 }
6361f656
AB		 1941 case '*': /* $* */
1942 case '#': /* $# */
9b387841 1943 if (sv_type == SVt_PV)
4f650b80 1944 /* diag_listed_as: $* is no longer supported */
9b387841 1945 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1946 "$%c is no longer supported", *name);
8ae1fe26 1947 break;
b3ca2e83
NC		 1948 case '\010': /* $^H */
1949 {
1950 HV *const hv = GvHVn(gv);
1951 hv_magic(hv, NULL, PERL_MAGIC_hints);
1952 }
1953 goto magicalize;
b82b06b8 1954 case '[': /* $[ */
7d69d4a6 1955 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1956 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 1957 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 1958 addmg = FALSE;
b82b06b8 1959 }
7d69d4a6 1960 else goto magicalize;
b82b06b8 1961 break;
cc4c2da6 1962 case '\023': /* $^S */
2fdbfb4d
AB		 1963 ro_magicalize:
1964 SvREADONLY_on(GvSVn(gv));
1965 /* FALL THROUGH */
6361f656 1966 case '0': /* $0 */
6361f656
AB		 1967 case '^': /* $^ */
1968 case '~': /* $~ */
1969 case '=': /* $= */
1970 case '%': /* $% */
1971 case '.': /* $. */
1972 case '(': /* $( */
1973 case ')': /* $) */
1974 case '<': /* $< */
1975 case '>': /* $> */
1976 case '\\': /* $\ */
1977 case '/': /* $/ */
4505a31f 1978 case '|': /* $| */
9cdac2a2 1979 case '$': /* $$ */
cc4c2da6
NC		 1980 case '\001': /* $^A */
1981 case '\003': /* $^C */
1982 case '\004': /* $^D */
1983 case '\005': /* $^E */
1984 case '\006': /* $^F */
cc4c2da6
NC		 1985 case '\011': /* $^I, NOT \t in EBCDIC */
1986 case '\016': /* $^N */
1987 case '\017': /* $^O */
1988 case '\020': /* $^P */
1989 case '\024': /* $^T */
1990 case '\027': /* $^W */
1991 magicalize:
ad64d0ec 1992 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 1993 break;
e521374c 1994
cc4c2da6 1995 case '\014': /* $^L */
76f68e9b 1996 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 1997 break;
6361f656 1998 case ';': /* $; */
76f68e9b 1999 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2000 break;
6361f656 2001 case ']': /* $] */
cc4c2da6 2002 {
3638bf15 2003 SV * const sv = GvSV(gv);
d7aa5382 2004 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2005 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2006 GvSV(gv) = vnumify(PL_patchlevel);
2007 SvREADONLY_on(GvSV(gv));
2008 SvREFCNT_dec(sv);
93a17b20
LW		 2009 }
2010 break;
cc4c2da6
NC		 2011 case '\026': /* $^V */
2012 {
3638bf15 2013 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2014 GvSV(gv) = new_version(PL_patchlevel);
2015 SvREADONLY_on(GvSV(gv));
2016 SvREFCNT_dec(sv);
16070b82
GS		 2017 }
2018 break;
cc4c2da6 2019 }
79072805 2020 }
930867a8
BF		 2021
2022 return addmg;
71c35c05
BF		 2023}
2024
070dc475
BF		 2025/* This function is called when the stash already holds the GV of the magic
2026 * variable we're looking for, but we need to check that it has the correct
2027 * kind of magic. For example, if someone first uses $! and then %!, the
2028 * latter would end up here, and we add the Errno tie to the HASH slot of
2029 * the *! glob.
2030 */
2031PERL_STATIC_INLINE void
2032S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2033{
2034 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2035
2036 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2037 if (*name == '!')
2038 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2039 else if (*name == '-' || *name == '+')
2040 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2041 } else if (sv_type == SVt_PV) {
2042 if (*name == '*' || *name == '#') {
2043 /* diag_listed_as: $* is no longer supported */
2044 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2045 WARN_SYNTAX),
2046 "$%c is no longer supported", *name);
2047 }
2048 }
2049 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2050 switch (*name) {
2051 case '[':
2052 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2053 break;
2054#ifdef PERL_SAWAMPERSAND
2055 case '`':
2056 PL_sawampersand |= SAWAMPERSAND_LEFT;
2057 (void)GvSVn(gv);
2058 break;
2059 case '&':
2060 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2061 (void)GvSVn(gv);
2062 break;
2063 case '\'':
2064 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2065 (void)GvSVn(gv);
2066 break;
2067#endif
2068 }
2069 }
2070}
2071
71c35c05
BF		 2072GV *
2073Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2074 const svtype sv_type)
2075{
2076 dVAR;
2077 const char *name = nambeg;
2078 GV *gv = NULL;
2079 GV**gvp;
2080 STRLEN len;
2081 HV *stash = NULL;
2082 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2083 const I32 no_expand = flags & GV_NOEXPAND;
2084 const I32 add = flags & ~GV_NOADD_MASK;
2085 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2086 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2087 const char *const name_end = nambeg + full_len;
2088 U32 faking_it;
2089
2090 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2091
2092 /* If we have GV_NOTQUAL, the caller promised that
2093 * there is no stash, so we can skip the check.
2094 * Similarly if full_len is 0, since then we're
2095 * dealing with something like *{""} or ""->foo()
2096 */
2097 if ((flags & GV_NOTQUAL) || !full_len) {
2098 len = full_len;
2099 }
2100 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2101 if (name == name_end) return gv;
2102 }
2103 else {
2104 return NULL;
2105 }
2106
2107 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2108 return NULL;
2109 }
2110
2111 /* By this point we should have a stash and a name */
2112 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -len : len,add);
2113 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2114 if (addmg) gv = (GV *)newSV(0);
2115 else return NULL;
2116 }
2117 else gv = *gvp, addmg = 0;
2118 /* From this point on, addmg means gv has not been inserted in the
2119 symtab yet. */
2120
2121 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2122 /* The GV already exists, so return it, but check if we need to do
2123 * anything else with it before that.
2124 */
71c35c05 2125 if (add) {
c002ae9a
BF		 2126 /* This is the heuristic that handles if a variable triggers the
2127 * 'used only once' warning. If there's already a GV in the stash
2128 * with this name, then we assume that the variable has been used
2129 * before and turn its MULTI flag on.
2130 * It's a heuristic because it can easily be "tricked", like with
2131 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2132 * not warning about $main::foo being used just once
2133 */
71c35c05
BF		 2134 GvMULTI_on(gv);
2135 gv_init_svtype(gv, sv_type);
2136 /* You reach this path once the typeglob has already been created,
2137 either by the same or a different sigil. If this path didn't
2138 exist, then (say) referencing $! first, and %! second would
2139 mean that %! was not handled correctly. */
2140 if (len == 1 && stash == PL_defstash) {
070dc475 2141 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2142 }
2143 else if (len == 3 && sv_type == SVt_PVAV
2144 && strnEQ(name, "ISA", 3)
2145 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2146 gv_magicalize_isa(gv);
2147 }
2148 return gv;
2149 } else if (no_init) {
2150 assert(!addmg);
2151 return gv;
c002ae9a
BF		 2152 }
2153 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2154 * don't expand it to a glob. This is an optimization so that things
2155 * copying constants over, like Exporter, don't have to be rewritten
2156 * to take into account that you can store more than just globs in
2157 * stashes.
2158 */
2159 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2160 assert(!addmg);
2161 return gv;
2162 }
2163
2164 /* Adding a new symbol.
2165 Unless of course there was already something non-GV here, in which case
2166 we want to behave as if there was always a GV here, containing some sort
2167 of subroutine.
2168 Otherwise we run the risk of creating things like GvIO, which can cause
2169 subtle bugs. eg the one that tripped up SQL::Translator */
2170
2171 faking_it = SvOK(gv);
2172
2173 if (add & GV_ADDWARN)
2174 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2175 "Had to create %"UTF8f" unexpectedly",
2176 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2177 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2178
9e5de6ae 2179 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2180 GvMULTI_on(gv) ;
2181
930867a8
BF		 2182 /* First, store the gv in the symtab if we're adding magic,
2183 * but only for non-empty GVs
2184 */
2185#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2186 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2187
2188 if ( addmg && !GvEMPTY(gv) ) {
2189 (void)hv_store(stash,name,len,(SV *)gv,0);
2190 }
2191
71c35c05 2192 /* set up magic where warranted */
930867a8
BF		 2193 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2194 /* See 23496c6 */
2195 if (GvEMPTY(gv)) {
2196 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2197 /* The GV was and still is "empty", except that now
2198 * it has the magic flags turned on, so we want it
2199 * stored in the symtab.
2200 */
2201 (void)hv_store(stash,name,len,(SV *)gv,0);
2202 }
2203 else {
2204 /* Most likely the temporary GV created above */
2205 SvREFCNT_dec_NN(gv);
2206 gv = NULL;
2207 }
2208 }
2209 }
71c35c05 2210
e6066781 2211 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2212 return gv;
79072805
LW		 2213}
2214
2215void
35a4481c 2216Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2217{
ed60a868 2218 const char *name;
35a4481c 2219 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2220
2221 PERL_ARGS_ASSERT_GV_FULLNAME4;
2222
666ea192 2223 sv_setpv(sv, prefix ? prefix : "");
a0288114 2224
52a6327b 2225 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2226 const STRLEN len = HvNAMELEN(hv);
2227 if (keepmain || strnNE(name, "main", len)) {
2228 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2229 sv_catpvs(sv,"::");
ed60a868 2230 }
43693395 2231 }
ed60a868 2232 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2233 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2234}
2235
2236void
35a4481c 2237Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2238{
099be4f1 2239 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2240
2241 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2242
46c461b5 2243 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2244}
2245
79072805 2246void
51da40ed 2247Perl_gv_check(pTHX_ HV *stash)
79072805 2248{
97aff369 2249 dVAR;
eb578fdb 2250 I32 i;
463ee0b2 2251
7918f24d
NC		 2252 PERL_ARGS_ASSERT_GV_CHECK;
2253
8990e307
LW		 2254 if (!HvARRAY(stash))
2255 return;
a0d0e21e 2256 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2257 const HE *entry;
51da40ed
FC		 2258 /* SvIsCOW is unused on HVs, so we can use it to mark stashes we
2259 are currently searching through recursively. */
2260 SvIsCOW_on(stash);
dc437b57 2261 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2262 GV *gv;
b7787f18 2263 HV *hv;
dc437b57 2264 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2265 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2266 {
51da40ed 2267 if (hv != PL_defstash && hv != stash && !SvIsCOW(hv))
a0d0e21e
LW		 2268 gv_check(hv); /* nested package */
2269 }
ecad31f0
BF		 2270 else if ( *HeKEY(entry) != '_'
2271 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2272 const char *file;
159b6efe 2273 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2274 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2275 continue;
1d7c1841 2276 file = GvFILE(gv);
1d7c1841 2277 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2278#ifdef USE_ITHREADS
2279 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2280#else
2281 CopFILEGV(PL_curcop)
2282 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2283#endif
9014280d 2284 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2285 "Name \"%"HEKf"::%"HEKf
2286 "\" used only once: possible typo",
2287 HEKfARG(HvNAME_HEK(stash)),
2288 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2289 }
79072805 2290 }
51da40ed 2291 SvIsCOW_off(stash);
79072805
LW		 2292 }
2293}
2294
2295GV *
9cc50d5b 2296Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2297{
97aff369 2298 dVAR;
9cc50d5b 2299 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2300 assert(!(flags & ~SVf_UTF8));
7918f24d 2301
b17a0679
FC		 2302 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2303 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2304 (long)PL_gensym++),
2305 GV_ADD, SVt_PVGV);
79072805
LW		 2306}
2307
2308/* hopefully this is only called on local symbol table entries */
2309
2310GP*
864dbfa3 2311Perl_gp_ref(pTHX_ GP *gp)
79072805 2312{
97aff369 2313 dVAR;
1d7c1841 2314 if (!gp)
d4c19fe8 2315 return NULL;
79072805 2316 gp->gp_refcnt++;
44a8e56a 2317 if (gp->gp_cv) {
2318 if (gp->gp_cvgen) {
e1a479c5
BB		 2319 /* If the GP they asked for a reference to contains
2320 a method cache entry, clear it first, so that we
2321 don't infect them with our cached entry */
e7881358 2322 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2323 gp->gp_cv = NULL;
44a8e56a 2324 gp->gp_cvgen = 0;
2325 }
44a8e56a 2326 }
79072805 2327 return gp;
79072805
LW		 2328}
2329
2330void
864dbfa3 2331Perl_gp_free(pTHX_ GV *gv)
79072805 2332{
97aff369 2333 dVAR;
79072805 2334 GP* gp;
b0d55c99 2335 int attempts = 100;
79072805 2336
f7877b28 2337 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2338 return;
f248d071 2339 if (gp->gp_refcnt == 0) {
9b387841
NC		 2340 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2341 "Attempt to free unreferenced glob pointers"
2342 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2343 return;
2344 }
748a9306
LW		 2345 if (--gp->gp_refcnt > 0) {
2346 if (gp->gp_egv == gv)
2347 gp->gp_egv = 0;
c43ae56f 2348 GvGP_set(gv, NULL);
79072805 2349 return;
748a9306 2350 }
79072805 2351
b0d55c99
FC		 2352 while (1) {
2353 /* Copy and null out all the glob slots, so destructors do not see
2354 freed SVs. */
2355 HEK * const file_hek = gp->gp_file_hek;
2356 SV * const sv = gp->gp_sv;
2357 AV * const av = gp->gp_av;
2358 HV * const hv = gp->gp_hv;
2359 IO * const io = gp->gp_io;
2360 CV * const cv = gp->gp_cv;
2361 CV * const form = gp->gp_form;
2362
2363 gp->gp_file_hek = NULL;
2364 gp->gp_sv = NULL;
2365 gp->gp_av = NULL;
2366 gp->gp_hv = NULL;
2367 gp->gp_io = NULL;
2368 gp->gp_cv = NULL;
2369 gp->gp_form = NULL;
2370
2371 if (file_hek)
2372 unshare_hek(file_hek);
2373
2374 SvREFCNT_dec(sv);
2375 SvREFCNT_dec(av);
2376 /* FIXME - another reference loop GV -> symtab -> GV ?
2377 Somehow gp->gp_hv can end up pointing at freed garbage. */
2378 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2379 const HEK *hvname_hek = HvNAME_HEK(hv);
103f5a36 2380 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", hvname_hek));
c2242065 2381 if (PL_stashcache && hvname_hek)
0ca9877d 2382 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC		 2383 SvREFCNT_dec(hv);
2384 }
2385 SvREFCNT_dec(io);
2386 SvREFCNT_dec(cv);
2387 SvREFCNT_dec(form);
2388
2389 if (!gp->gp_file_hek
2390 && !gp->gp_sv
2391 && !gp->gp_av
2392 && !gp->gp_hv
2393 && !gp->gp_io
2394 && !gp->gp_cv
2395 && !gp->gp_form) break;
2396
2397 if (--attempts == 0) {
2398 Perl_die(aTHX_
2399 "panic: gp_free failed to free glob pointer - "
2400 "something is repeatedly re-creating entries"
2401 );
2402 }
13207a71 2403 }
748a9306 2404
79072805 2405 Safefree(gp);
c43ae56f 2406 GvGP_set(gv, NULL);
79072805
LW		 2407}
2408
d460ef45
NIS		 2409int
2410Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2411{
53c1dcc0
AL		 2412 AMT * const amtp = (AMT*)mg->mg_ptr;
2413 PERL_UNUSED_ARG(sv);
dd374669 2414
7918f24d
NC		 2415 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2416
d460ef45
NIS		 2417 if (amtp && AMT_AMAGIC(amtp)) {
2418 int i;
2419 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2420 CV * const cv = amtp->table[i];
b37c2d43 2421 if (cv) {
e7881358 2422 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2423 amtp->table[i] = NULL;
d460ef45
NIS		 2424 }
2425 }
2426 }
2427 return 0;
2428}
2429
a0d0e21e 2430/* Updates and caches the CV's */
c3a9a790
RGS		 2431/* Returns:
2432 * 1 on success and there is some overload
2433 * 0 if there is no overload
2434 * -1 if some error occurred and it couldn't croak
2435 */
a0d0e21e 2436
c3a9a790 2437int
242f8760 2438Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2439{
97aff369 2440 dVAR;
ad64d0ec 2441 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2442 AMT amt;
9b439311 2443 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2444 U32 newgen;
a0d0e21e 2445
7918f24d
NC		 2446 PERL_ARGS_ASSERT_GV_AMUPDATE;
2447
9b439311 2448 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2449 if (mg) {
2450 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2451 if (amtp->was_ok_sub == newgen) {
8c34e50d 2452 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2453 }
ad64d0ec 2454 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2455 }
a0d0e21e 2456
bfcb3514 2457 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2458
d460ef45 2459 Zero(&amt,1,AMT);
e1a479c5 2460 amt.was_ok_sub = newgen;
a6006777 2461 amt.fallback = AMGfallNO;
2462 amt.flags = 0;
2463
a6006777 2464 {
8c34e50d
FC		 2465 int filled = 0;
2466 int i;
a6006777 2467
3866ea3b 2468 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2469
89ffc314 2470 /* Try to find via inheritance. */
e6919483 2471 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2472 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2473 CV* cv;
89ffc314
IZ		 2474
2475 if (!gv)
3866ea3b
FC		 2476 {
2477 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2478 goto no_table;
3866ea3b
FC		 2479 }
2480#ifdef PERL_DONT_CREATE_GVSV
2481 else if (!sv) {
6f207bd3 2482 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2483 }
2484#endif
79c9643d
JL		 2485 else if (SvTRUE(sv))
2486 /* don't need to set overloading here because fallback => 1
2487 * is the default setting for classes without overloading */
89ffc314 2488 amt.fallback=AMGfallYES;
79c9643d
JL		 2489 else if (SvOK(sv)) {
2490 amt.fallback=AMGfallNEVER;
386a5489 2491 filled = 1;
386a5489 2492 }
79c9643d 2493 else {
386a5489 2494 filled = 1;
386a5489 2495 }
a6006777 2496
8c34e50d 2497 for (i = 1; i < NofAMmeth; i++) {
6136c704 2498 const char * const cooky = PL_AMG_names[i];
32251b26 2499 /* Human-readable form, for debugging: */
8c34e50d 2500 const char * const cp = AMG_id2name(i);
d279ab82 2501 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2502
a0288114 2503 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2504 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2505 /* don't fill the cache while looking up!
2506 Creation of inheritance stubs in intermediate packages may
2507 conflict with the logic of runtime method substitution.
2508 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2509 then we could have created stubs for "(+0" in A and C too.
2510 But if B overloads "bool", we may want to use it for
2511 numifying instead of C's "+0". */
8c34e50d 2512 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2513 cv = 0;
89ffc314 2514 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC		 2515 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2516 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2517 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2518 && strEQ(hvname, "overload")) {
611c1e95
IZ		 2519 /* This is a hack to support autoloading..., while
2520 knowing *which* methods were declared as overloaded. */
44a8e56a 2521 /* GvSV contains the name of the method. */
6136c704 2522 GV *ngv = NULL;
c69033f2 2523 SV *gvsv = GvSV(gv);
a0288114
AL		 2524
2525 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2526 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2527 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2528 if (!gvsv || !SvPOK(gvsv)
7f415459 2529 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2530 {
a0288114 2531 /* Can be an import stub (created by "can"). */
242f8760 2532 if (destructing) {
c3a9a790 2533 return -1;
242f8760
RGS		 2534 }
2535 else {
d66cca07
BF		 2536 const SV * const name = (gvsv && SvPOK(gvsv))
2537 ? gvsv
2538 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2539 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2540 Perl_croak(aTHX_ "%s method \"%"SVf256
2541 "\" overloading \"%s\" "\
d0c0e7dd 2542 "in package \"%"HEKf256"\"",
242f8760
RGS		 2543 (GvCVGEN(gv) ? "Stub found while resolving"
2544 : "Can't resolve"),
d66cca07 2545 SVfARG(name), cp,
d0c0e7dd 2546 HEKfARG(
d66cca07 2547 HvNAME_HEK(stash)
d0c0e7dd 2548 ));
242f8760 2549 }
44a8e56a 2550 }
dc848c6f 2551 cv = GvCV(gv = ngv);
f0e9f182 2552 }
44a8e56a 2553 }
b464bac0 2554 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2555 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2556 GvNAME(CvGV(cv))) );
2557 filled = 1;
611c1e95 2558 } else if (gv) { /* Autoloaded... */
ea726b52 2559 cv = MUTABLE_CV(gv);
611c1e95 2560 filled = 1;
44a8e56a 2561 }
ea726b52 2562 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
a0d0e21e 2563 }
a0d0e21e 2564 if (filled) {
a6006777 2565 AMT_AMAGIC_on(&amt);
ad64d0ec 2566 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2567 (char*)&amt, sizeof(AMT));
8c34e50d 2568 return TRUE;
a0d0e21e
LW		 2569 }
2570 }
a6006777 2571 /* Here we have no table: */
8c34e50d 2572 no_table:
a6006777 2573 AMT_AMAGIC_off(&amt);
ad64d0ec 2574 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2575 (char*)&amt, sizeof(AMTS));
c3a9a790 2576 return 0;
a0d0e21e
LW		 2577}
2578
32251b26
IZ		 2579
2580CV*
2581Perl_gv_handler(pTHX_ HV *stash, I32 id)
2582{
97aff369 2583 dVAR;
3f8f4626 2584 MAGIC *mg;
32251b26 2585 AMT *amtp;
e1a479c5 2586 U32 newgen;
9b439311 2587 struct mro_meta* stash_meta;
32251b26 2588
bfcb3514 2589 if (!stash || !HvNAME_get(stash))
601f1833 2590 return NULL;
e1a479c5 2591
9b439311
BB		 2592 stash_meta = HvMROMETA(stash);
2593 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2594
ad64d0ec 2595 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2596 if (!mg) {
2597 do_update:
8c34e50d 2598 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2599 return NULL;
ad64d0ec 2600 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2601 }
a9fd4e40 2602 assert(mg);
32251b26 2603 amtp = (AMT*)mg->mg_ptr;
66978156 2604 if ( amtp->was_ok_sub != newgen )
32251b26 2605 goto do_update;
3ad83ce7 2606 if (AMT_AMAGIC(amtp)) {
b7787f18 2607 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2608 if (ret && isGV(ret)) { /* Autoloading stab */
2609 /* Passing it through may have resulted in a warning
2610 "Inherited AUTOLOAD for a non-method deprecated", since
2611 our caller is going through a function call, not a method call.
2612 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2613 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2614
2615 if (gv && GvCV(gv))
2616 return GvCV(gv);
2617 }
2618 return ret;
2619 }
a0288114 2620
601f1833 2621 return NULL;
32251b26
IZ		 2622}
2623
2624
6f1401dc
DM		 2625/* Implement tryAMAGICun_MG macro.
2626 Do get magic, then see if the stack arg is overloaded and if so call it.
2627 Flags:
2628 AMGf_set return the arg using SETs rather than assigning to
2629 the targ
2630 AMGf_numeric apply sv_2num to the stack arg.
2631*/
2632
2633bool
2634Perl_try_amagic_un(pTHX_ int method, int flags) {
2635 dVAR;
2636 dSP;
2637 SV* tmpsv;
2638 SV* const arg = TOPs;
2639
2640 SvGETMAGIC(arg);
2641
9f8bf298
NC		 2642 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2643 AMGf_noright | AMGf_unary))) {
6f1401dc
DM		 2644 if (flags & AMGf_set) {
2645 SETs(tmpsv);
2646 }
2647 else {
2648 dTARGET;
2649 if (SvPADMY(TARG)) {
2650 sv_setsv(TARG, tmpsv);
2651 SETTARG;
2652 }
2653 else
2654 SETs(tmpsv);
2655 }
2656 PUTBACK;
2657 return TRUE;
2658 }
2659
2660 if ((flags & AMGf_numeric) && SvROK(arg))
2661 *sp = sv_2num(arg);
2662 return FALSE;
2663}
2664
2665
2666/* Implement tryAMAGICbin_MG macro.
2667 Do get magic, then see if the two stack args are overloaded and if so
2668 call it.
2669 Flags:
2670 AMGf_set return the arg using SETs rather than assigning to
2671 the targ
2672 AMGf_assign op may be called as mutator (eg +=)
2673 AMGf_numeric apply sv_2num to the stack arg.
2674*/
2675
2676bool
2677Perl_try_amagic_bin(pTHX_ int method, int flags) {
2678 dVAR;
2679 dSP;
2680 SV* const left = TOPm1s;
2681 SV* const right = TOPs;
2682
2683 SvGETMAGIC(left);
2684 if (left != right)
2685 SvGETMAGIC(right);
2686
2687 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2688 SV * const tmpsv = amagic_call(left, right, method,
2689 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2690 if (tmpsv) {
2691 if (flags & AMGf_set) {
2692 (void)POPs;
2693 SETs(tmpsv);
2694 }
2695 else {
2696 dATARGET;
2697 (void)POPs;
2698 if (opASSIGN || SvPADMY(TARG)) {
2699 sv_setsv(TARG, tmpsv);
2700 SETTARG;
2701 }
2702 else
2703 SETs(tmpsv);
2704 }
2705 PUTBACK;
2706 return TRUE;
2707 }
2708 }
75ea7a12
FC		 2709 if(left==right && SvGMAGICAL(left)) {
2710 SV * const left = sv_newmortal();
2711 *(sp-1) = left;
2712 /* Print the uninitialized warning now, so it includes the vari-
2713 able name. */
2714 if (!SvOK(right)) {
2715 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2716 sv_setsv_flags(left, &PL_sv_no, 0);
2717 }
2718 else sv_setsv_flags(left, right, 0);
2719 SvGETMAGIC(right);
2720 }
6f1401dc 2721 if (flags & AMGf_numeric) {
75ea7a12
FC		 2722 if (SvROK(TOPm1s))
2723 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2724 if (SvROK(right))
2725 *sp = sv_2num(right);
2726 }
2727 return FALSE;
2728}
2729
25a9ffce
NC		 2730SV *
2731Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2732 SV *tmpsv = NULL;
2733
2734 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2735
2736 while (SvAMAGIC(ref) &&
2737 (tmpsv = amagic_call(ref, &PL_sv_undef, method,
2738 AMGf_noright | AMGf_unary))) {
2739 if (!SvROK(tmpsv))
2740 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2741 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2742 /* Bail out if it returns us the same reference. */
2743 return tmpsv;
2744 }
2745 ref = tmpsv;
2746 }
2747 return tmpsv ? tmpsv : ref;
2748}
6f1401dc 2749
8d569291
FC		 2750bool
2751Perl_amagic_is_enabled(pTHX_ int method)
2752{
2753 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2754
2755 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2756
2757 if ( !lex_mask || !SvOK(lex_mask) )
2758 /* overloading lexically disabled */
2759 return FALSE;
2760 else if ( lex_mask && SvPOK(lex_mask) ) {
2761 /* we have an entry in the hints hash, check if method has been
2762 * masked by overloading.pm */
2763 STRLEN len;
2764 const int offset = method / 8;
2765 const int bit = method % 8;
2766 char *pv = SvPV(lex_mask, len);
2767
2768 /* Bit set, so this overloading operator is disabled */
2769 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2770 return FALSE;
2771 }
2772 return TRUE;
2773}
2774
a0d0e21e 2775SV*
864dbfa3 2776Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2777{
27da23d5 2778 dVAR;
b267980d 2779 MAGIC *mg;
9c5ffd7c 2780 CV *cv=NULL;
a0d0e21e 2781 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2782 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 2783 int off = 0, off1, lr = 0, notfound = 0;
2784 int postpr = 0, force_cpy = 0;
2785 int assign = AMGf_assign & flags;
2786 const int assignshift = assign ? 1 : 0;
bf5522a1 2787 int use_default_op = 0;
67288365 2788 int force_scalar = 0;
497b47a8
JH		 2789#ifdef DEBUGGING
2790 int fl=0;
497b47a8 2791#endif
25716404 2792 HV* stash=NULL;
7918f24d
NC		 2793
2794 PERL_ARGS_ASSERT_AMAGIC_CALL;
2795
e46c382e 2796 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2797 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 2798 }
2799
a0d0e21e 2800 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2801 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2802 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2803 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2804 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2805 : NULL))
b267980d 2806 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 2807 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2808 * usual method */
497b47a8
JH		 2809 (
2810#ifdef DEBUGGING
2811 fl = 1,
a0288114 2812#endif
497b47a8 2813 cv = cvp[off=method])))) {
a0d0e21e
LW		 2814 lr = -1; /* Call method for left argument */
2815 } else {
2816 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2817 int logic;
2818
2819 /* look for substituted methods */
ee239bfe 2820 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 2821 switch (method) {
2822 case inc_amg:
ee239bfe
IZ		 2823 force_cpy = 1;
2824 if ((cv = cvp[off=add_ass_amg])
2825 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2826 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2827 }
2828 break;
2829 case dec_amg:
ee239bfe
IZ		 2830 force_cpy = 1;
2831 if ((cv = cvp[off = subtr_ass_amg])
2832 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2833 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2834 }
2835 break;
2836 case bool__amg:
2837 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2838 break;
2839 case numer_amg:
2840 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2841 break;
2842 case string_amg:
2843 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2844 break;
b7787f18
AL		 2845 case not_amg:
2846 (void)((cv = cvp[off=bool__amg])
2847 || (cv = cvp[off=numer_amg])
2848 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 2849 if (cv)
2850 postpr = 1;
b7787f18 2851 break;
748a9306
LW		 2852 case copy_amg:
2853 {
76e3520e
GS		 2854 /*
2855 * SV* ref causes confusion with the interpreter variable of
2856 * the same name
2857 */
890ce7af 2858 SV* const tmpRef=SvRV(left);
76e3520e 2859 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 2860 /*
2861 * Just to be extra cautious. Maybe in some
2862 * additional cases sv_setsv is safe, too.
2863 */
890ce7af 2864 SV* const newref = newSVsv(tmpRef);
748a9306 2865 SvOBJECT_on(newref);
a1cd65be
FC		 2866 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2867 delegate to the stash. */
85fbaab2 2868 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 2869 return newref;
2870 }
2871 }
2872 break;
a0d0e21e 2873 case abs_amg:
b267980d 2874 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2875 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2876 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2877 if (off1==lt_amg) {
890ce7af 2878 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2879 lt_amg,AMGf_noright);
2880 logic = SvTRUE(lessp);
2881 } else {
890ce7af 2882 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2883 ncmp_amg,AMGf_noright);
2884 logic = (SvNV(lessp) < 0);
2885 }
2886 if (logic) {
2887 if (off==subtr_amg) {
2888 right = left;
748a9306 2889 left = nullsv;
a0d0e21e
LW		 2890 lr = 1;
2891 }
2892 } else {
2893 return left;
2894 }
2895 }
2896 break;
2897 case neg_amg:
155aba94 2898 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 2899 right = left;
2900 left = sv_2mortal(newSViv(0));
2901 lr = 1;
2902 }
2903 break;
f216259d 2904 case int_amg:
f5284f61 2905 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2906 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2907 case regexp_amg:
b267980d
NIS		 2908 /* FAIL safe */
2909 return NULL; /* Delegate operation to standard mechanisms. */
2910 break;
f5284f61
IZ		 2911 case to_sv_amg:
2912 case to_av_amg:
2913 case to_hv_amg:
2914 case to_gv_amg:
2915 case to_cv_amg:
2916 /* FAIL safe */
b267980d 2917 return left; /* Delegate operation to standard mechanisms. */
f5284f61 2918 break;
a0d0e21e
LW		 2919 default:
2920 goto not_found;
2921 }
2922 if (!cv) goto not_found;
2923 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2924 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2925 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2926 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2927 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2928 : NULL))
69815d08
RS		 2929 && (cv = cvp[off=method])) { /* Method for right
2930 * argument found */
2931 lr=1;
bf5522a1
MB		 2932 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2933 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 2934 && !(flags & AMGf_unary)) {
2935 /* We look for substitution for
2936 * comparison operations and
fc36a67e 2937 * concatenation */
a0d0e21e
LW		 2938 if (method==concat_amg || method==concat_ass_amg
2939 || method==repeat_amg || method==repeat_ass_amg) {
2940 return NULL; /* Delegate operation to string conversion */
2941 }
2942 off = -1;
2943 switch (method) {
2944 case lt_amg:
2945 case le_amg:
2946 case gt_amg:
2947 case ge_amg:
2948 case eq_amg:
2949 case ne_amg:
2ab54efd
MB		 2950 off = ncmp_amg;
2951 break;
a0d0e21e
LW		 2952 case slt_amg:
2953 case sle_amg:
2954 case sgt_amg:
2955 case sge_amg:
2956 case seq_amg:
2957 case sne_amg:
2ab54efd
MB		 2958 off = scmp_amg;
2959 break;
a0d0e21e 2960 }
bf5522a1
MB		 2961 if (off != -1) {
2962 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
2963 cv = ocvp[off];
2964 lr = -1;
2965 }
2966 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
2967 cv = cvp[off];
2968 lr = 1;
2969 }
2970 }
2971 if (cv)
2ab54efd
MB		 2972 postpr = 1;
2973 else
2974 goto not_found;
a0d0e21e 2975 } else {
a6006777 2976 not_found: /* No method found, either report or croak */
b267980d
NIS		 2977 switch (method) {
2978 case to_sv_amg:
2979 case to_av_amg:
2980 case to_hv_amg:
2981 case to_gv_amg:
2982 case to_cv_amg:
2983 /* FAIL safe */
2984 return left; /* Delegate operation to standard mechanisms. */
2985 break;
2986 }
a0d0e21e
LW		 2987 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
2988 notfound = 1; lr = -1;
2989 } else if (cvp && (cv=cvp[nomethod_amg])) {
2990 notfound = 1; lr = 1;
bf5522a1
MB		 2991 } else if ((use_default_op =
2992 (!ocvp || oamtp->fallback >= AMGfallYES)
2993 && (!cvp || amtp->fallback >= AMGfallYES))
2994 && !DEBUG_o_TEST) {
4cc0ca18
NC		 2995 /* Skip generating the "no method found" message. */
2996 return NULL;
a0d0e21e 2997 } else {
46fc3d4c 2998 SV *msg;
774d564b 2999 if (off==-1) off=method;
b267980d 3000 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3001 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3002 AMG_id2name(method + assignshift),
3003 (flags & AMGf_unary ? " " : "\n\tleft "),
3004 SvAMAGIC(left)?
3005 "in overloaded package ":
3006 "has no overloaded magic",
3007 SvAMAGIC(left)?
3008 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3009 SVfARG(&PL_sv_no),
3010 SvAMAGIC(right)?
3011 ",\n\tright argument in overloaded package ":
3012 (flags & AMGf_unary
3013 ? ""
3014 : ",\n\tright argument has no overloaded magic"),
3015 SvAMAGIC(right)?
3016 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3017 SVfARG(&PL_sv_no)));
bf5522a1 3018 if (use_default_op) {
d66cca07 3019 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3020 } else {
be2597df 3021 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3022 }
3023 return NULL;
3024 }
ee239bfe 3025 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3026 }
3027 }
67288365
JL		 3028
3029 switch (method) {
3030 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3031 * operation. we need this to return a value, so that it can be assigned
3032 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3033 * increment or decrement was itself called in void context */
3034 case inc_amg:
3035 if (off == add_amg)
3036 force_scalar = 1;
3037 break;
3038 case dec_amg:
3039 if (off == subtr_amg)
3040 force_scalar = 1;
3041 break;
3042 /* in these cases, we're calling an assignment variant of an operator
3043 * (+= rather than +, for instance). regardless of whether it's a
3044 * fallback or not, it always has to return a value, which will be
3045 * assigned to the proper variable later */
3046 case add_amg:
3047 case subtr_amg:
3048 case mult_amg:
3049 case div_amg:
3050 case modulo_amg:
3051 case pow_amg:
3052 case lshift_amg:
3053 case rshift_amg:
3054 case repeat_amg:
3055 case concat_amg:
3056 case band_amg:
3057 case bor_amg:
3058 case bxor_amg:
3059 if (assign)
3060 force_scalar = 1;
3061 break;
3062 /* the copy constructor always needs to return a value */
3063 case copy_amg:
3064 force_scalar = 1;
3065 break;
3066 /* because of the way these are implemented (they don't perform the
3067 * dereferencing themselves, they return a reference that perl then
3068 * dereferences later), they always have to be in scalar context */
3069 case to_sv_amg:
3070 case to_av_amg:
3071 case to_hv_amg:
3072 case to_gv_amg:
3073 case to_cv_amg:
3074 force_scalar = 1;
3075 break;
3076 /* these don't have an op of their own; they're triggered by their parent
3077 * op, so the context there isn't meaningful ('$a and foo()' in void
3078 * context still needs to pass scalar context on to $a's bool overload) */
3079 case bool__amg:
3080 case numer_amg:
3081 case string_amg:
3082 force_scalar = 1;
3083 break;
3084 }
3085
497b47a8 3086#ifdef DEBUGGING
a0d0e21e 3087 if (!notfound) {
497b47a8 3088 DEBUG_o(Perl_deb(aTHX_
d66cca07 3089 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3090 AMG_id2name(off),
3091 method+assignshift==off? "" :
a0288114 3092 " (initially \"",
497b47a8
JH		 3093 method+assignshift==off? "" :
3094 AMG_id2name(method+assignshift),
a0288114 3095 method+assignshift==off? "" : "\")",
497b47a8
JH		 3096 flags & AMGf_unary? "" :
3097 lr==1 ? " for right argument": " for left argument",
3098 flags & AMGf_unary? " for argument" : "",
d66cca07 3099 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3100 fl? ",\n\tassignment variant used": "") );
ee239bfe 3101 }
497b47a8 3102#endif
748a9306
LW		 3103 /* Since we use shallow copy during assignment, we need
3104 * to dublicate the contents, probably calling user-supplied
3105 * version of copy operator
3106 */
ee239bfe
IZ		 3107 /* We need to copy in following cases:
3108 * a) Assignment form was called.
3109 * assignshift==1, assign==T, method + 1 == off
3110 * b) Increment or decrement, called directly.
3111 * assignshift==0, assign==0, method + 0 == off
3112 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3113 * assignshift==0, assign==T,
ee239bfe
IZ		 3114 * force_cpy == T
3115 * d) Increment or decrement, translated to nomethod.
b267980d 3116 * assignshift==0, assign==0,
ee239bfe
IZ		 3117 * force_cpy == T
3118 * e) Assignment form translated to nomethod.
3119 * assignshift==1, assign==T, method + 1 != off
3120 * force_cpy == T
3121 */
3122 /* off is method, method+assignshift, or a result of opcode substitution.
3123 * In the latter case assignshift==0, so only notfound case is important.
3124 */
73512201 3125 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3126 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3127 || force_cpy) )
6f1401dc 3128 {
1b38c28e
NC		 3129 /* newSVsv does not behave as advertised, so we copy missing
3130 * information by hand */
3131 SV *tmpRef = SvRV(left);
3132 SV *rv_copy;
31d632c3 3133 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3134 SvRV_set(left, rv_copy);
3135 SvSETMAGIC(left);
e7881358 3136 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3137 }
6f1401dc
DM		 3138 }
3139
a0d0e21e
LW		 3140 {
3141 dSP;
3142 BINOP myop;
3143 SV* res;
b7787f18 3144 const bool oldcatch = CATCH_GET;
67288365
JL		 3145 I32 oldmark, nret;
3146 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3147
54310121 3148 CATCH_SET(TRUE);
a0d0e21e
LW		 3149 Zero(&myop, 1, BINOP);
3150 myop.op_last = (OP *) &myop;
b37c2d43 3151 myop.op_next = NULL;
67288365
JL		 3152 myop.op_flags = OPf_STACKED;
3153
3154 switch (gimme) {
3155 case G_VOID:
3156 myop.op_flags |= OPf_WANT_VOID;
3157 break;
3158 case G_ARRAY:
3159 if (flags & AMGf_want_list) {
3160 myop.op_flags |= OPf_WANT_LIST;
3161 break;
3162 }
3163 /* FALLTHROUGH */
3164 default:
3165 myop.op_flags |= OPf_WANT_SCALAR;
3166 break;
3167 }
a0d0e21e 3168
e788e7d3 3169 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3170 ENTER;
462e5cf6 3171 SAVEOP();
533c011a 3172 PL_op = (OP *) &myop;
3280af22 3173 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3174 PL_op->op_private |= OPpENTERSUB_DB;
a0d0e21e 3175 PUTBACK;
897d3989 3176 Perl_pp_pushmark(aTHX);
a0d0e21e 3177
924508f0 3178 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3179 PUSHs(lr>0? right: left);
3180 PUSHs(lr>0? left: right);
3280af22 3181 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3182 if (notfound) {
59cd0e26
NC		 3183 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3184 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3185 }
ad64d0ec 3186 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3187 PUTBACK;
67288365 3188 oldmark = TOPMARK;
a0d0e21e 3189
139d0ce6 3190 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3191 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3192 LEAVE;
3193 SPAGAIN;
67288365
JL		 3194 nret = SP - (PL_stack_base + oldmark);
3195
3196 switch (gimme) {
3197 case G_VOID:
3198 /* returning NULL has another meaning, and we check the context
3199 * at the call site too, so this can be differentiated from the
3200 * scalar case */
3201 res = &PL_sv_undef;
3202 SP = PL_stack_base + oldmark;
3203 break;
3204 case G_ARRAY: {
3205 if (flags & AMGf_want_list) {
3206 res = sv_2mortal((SV *)newAV());
3207 av_extend((AV *)res, nret);
3208 while (nret--)
3209 av_store((AV *)res, nret, POPs);
3210 break;
3211 }
3212 /* FALLTHROUGH */
3213 }
3214 default:
3215 res = POPs;
3216 break;
3217 }
a0d0e21e 3218
ebafeae7 3219 PUTBACK;
d3acc0f7 3220 POPSTACK;
54310121 3221 CATCH_SET(oldcatch);
a0d0e21e 3222
a0d0e21e 3223 if (postpr) {
b7787f18 3224 int ans;
a0d0e21e
LW		 3225 switch (method) {
3226 case le_amg:
3227 case sle_amg:
3228 ans=SvIV(res)<=0; break;
3229 case lt_amg:
3230 case slt_amg:
3231 ans=SvIV(res)<0; break;
3232 case ge_amg:
3233 case sge_amg:
3234 ans=SvIV(res)>=0; break;
3235 case gt_amg:
3236 case sgt_amg:
3237 ans=SvIV(res)>0; break;
3238 case eq_amg:
3239 case seq_amg:
3240 ans=SvIV(res)==0; break;
3241 case ne_amg:
3242 case sne_amg:
3243 ans=SvIV(res)!=0; break;
3244 case inc_amg:
3245 case dec_amg:
bbce6d69 3246 SvSetSV(left,res); return left;
dc437b57 3247 case not_amg:
fe7ac86a 3248 ans=!SvTRUE(res); break;
b7787f18
AL		 3249 default:
3250 ans=0; break;
a0d0e21e 3251 }
54310121 3252 return boolSV(ans);
748a9306
LW		 3253 } else if (method==copy_amg) {
3254 if (!SvROK(res)) {
cea2e8a9 3255 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3256 }
3257 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3258 } else {
3259 return res;
3260 }
3261 }
3262}
c9d5ac95 3263
f5c1e807
NC		 3264void
3265Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3266{
3267 dVAR;
acda4c6a 3268 U32 hash;
f5c1e807 3269
7918f24d 3270 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3271
acda4c6a
NC		 3272 if (len > I32_MAX)
3273 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3274
ae8cc45f
NC		 3275 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3276 unshare_hek(GvNAME_HEK(gv));
3277 }
3278
acda4c6a 3279 PERL_HASH(hash, name, len);
c60dbbc3 3280 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3281}
3282
66610fdd 3283/*
f7461760
Z		 3284=for apidoc gv_try_downgrade
3285
2867cdbc
Z		 3286If the typeglob C<gv> can be expressed more succinctly, by having
3287something other than a real GV in its place in the stash, replace it
3288with the optimised form. Basic requirements for this are that C<gv>
3289is a real typeglob, is sufficiently ordinary, and is only referenced
3290from its package. This function is meant to be used when a GV has been
3291looked up in part to see what was there, causing upgrading, but based
3292on what was found it turns out that the real GV isn't required after all.
3293
3294If C<gv> is a completely empty typeglob, it is deleted from the stash.
3295
3296If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3297sub, the typeglob is replaced with a scalar-reference placeholder that
3298more compactly represents the same thing.
f7461760
Z		 3299
3300=cut
3301*/
3302
3303void
3304Perl_gv_try_downgrade(pTHX_ GV *gv)
3305{
3306 HV *stash;
3307 CV *cv;
3308 HEK *namehek;
3309 SV **gvp;
3310 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3311
3312 /* XXX Why and where does this leave dangling pointers during global
3313 destruction? */
627364f1 3314 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3315
2867cdbc 3316 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3317 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3318 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3319 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3320 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3321 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3322 return;
2be08ad1
FC		 3323 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3324 return;
803f2748
DM		 3325 if (SvMAGICAL(gv)) {
3326 MAGIC *mg;
3327 /* only backref magic is allowed */
3328 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3329 return;
3330 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3331 if (mg->mg_type != PERL_MAGIC_backref)
3332 return;
3333 }
3334 }
2867cdbc
Z		 3335 cv = GvCV(gv);
3336 if (!cv) {
3337 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3338 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
2867cdbc 3339 } else if (GvMULTI(gv) && cv &&
f7461760
Z		 3340 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3341 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3342 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3343 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3344 (namehek = GvNAME_HEK(gv)) &&
3345 (gvp = hv_fetch(stash, HEK_KEY(namehek),
3346 HEK_LEN(namehek)*(HEK_UTF8(namehek) ? -1 : 1), 0)) &&
3347 *gvp == (SV*)gv) {
3348 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3349 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3350 SvREFCNT(gv) = 0;
3351 sv_clear((SV*)gv);
3352 SvREFCNT(gv) = 1;
70e5f2b5 3353 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z		 3354 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3355 STRUCT_OFFSET(XPVIV, xiv_iv));
3356 SvRV_set(gv, value);
3357 }
3358}
3359
4aaa4757
FC		 3360#include "XSUB.h"
3361
3362static void
3363core_xsub(pTHX_ CV* cv)
3364{
3365 Perl_croak(aTHX_
3366 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3367 );
3368}
3369
f7461760 3370/*
66610fdd
RGS		 3371 * Local variables:
3372 * c-indentation-style: bsd
3373 * c-basic-offset: 4
14d04a33 3374 * indent-tabs-mode: nil
66610fdd
RGS		 3375 * End:
3376 *
14d04a33 3377 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3378 */
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