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locale.c: Skip compiling fallback code on modern platforms
[perl5.git] / gv.c
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a0d0e21e 1/* gv.c
79072805 2 *
1129b882 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
67fbe0e1 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
12 * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure
4ac71550 13 * of your inquisitiveness, I shall spend all the rest of my days in answering
a0d0e21e
LW		 14 * you. What more do you want to know?'
15 * 'The names of all the stars, and of all living things, and the whole
16 * history of Middle-earth and Over-heaven and of the Sundering Seas,'
17 * laughed Pippin.
4ac71550 18 *
cdad3b53 19 * [p.599 of _The Lord of the Rings_, III/xi: "The Palantír"]
79072805
LW		 20 */
21
ccfc67b7
JH		 22/*
23=head1 GV Functions
166f8a29
DM		 24A GV is a structure which corresponds to to a Perl typeglob, ie *foo.
25It is a structure that holds a pointer to a scalar, an array, a hash etc,
26corresponding to $foo, @foo, %foo.
27
28GVs are usually found as values in stashes (symbol table hashes) where
29Perl stores its global variables.
30
31=cut
ccfc67b7
JH		 32*/
33
79072805 34#include "EXTERN.h"
864dbfa3 35#define PERL_IN_GV_C
79072805 36#include "perl.h"
8261f8eb 37#include "overload.c"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a
AL		 41static const char S_autoload[] = "AUTOLOAD";
42static const STRLEN S_autolen = sizeof(S_autoload)-1;
5c7983e5 43
c69033f2 44GV *
d5713896 45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13be902c
FC		 49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
53 && SvTYPE((const SV *)gv) != SVt_PVLV
54 )
55 ) {
bb85b28a
NC		 56 const char *what;
57 if (type == SVt_PVIO) {
58 /*
59 * if it walks like a dirhandle, then let's assume that
60 * this is a dirhandle.
61 */
332c2eac 62 what = OP_IS_DIRHOP(PL_op->op_type) ?
bb85b28a 63 "dirhandle" : "filehandle";
bb85b28a
NC		 64 } else if (type == SVt_PVHV) {
65 what = "hash";
66 } else {
67 what = type == SVt_PVAV ? "array" : "scalar";
68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896
NC		 72
73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
bb85b28a
NC		 77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
d5713896
NC		 79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
d5713896 83 if (!*where)
e17aed30 84 {
d5713896 85 *where = newSV_type(type);
e17aed30
FC		 86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
87 && strnEQ(GvNAME(gv), "ISA", 3))
88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
89 }
79072805
LW		 90 return gv;
91}
92
93GV *
864dbfa3 94Perl_gv_fetchfile(pTHX_ const char *name)
79072805 95{
7918f24d 96 PERL_ARGS_ASSERT_GV_FETCHFILE;
d9095cec
NC		 97 return gv_fetchfile_flags(name, strlen(name), 0);
98}
99
100GV *
101Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen,
102 const U32 flags)
103{
4116122e 104 char smallbuf[128];
53d95988 105 char *tmpbuf;
d9095cec 106 const STRLEN tmplen = namelen + 2;
79072805
LW		 107 GV *gv;
108
7918f24d 109 PERL_ARGS_ASSERT_GV_FETCHFILE_FLAGS;
d9095cec
NC		 110 PERL_UNUSED_ARG(flags);
111
1d7c1841 112 if (!PL_defstash)
a0714e2c 113 return NULL;
1d7c1841 114
d9095cec 115 if (tmplen <= sizeof smallbuf)
53d95988
CS		 116 tmpbuf = smallbuf;
117 else
798b63bc 118 Newx(tmpbuf, tmplen, char);
0ac0412a 119 /* This is where the debugger's %{"::_<$filename"} hash is created */
53d95988
CS		 120 tmpbuf[0] = '_';
121 tmpbuf[1] = '<';
d9095cec
NC		 122 memcpy(tmpbuf + 2, name, namelen);
123 gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE);
1d7c1841 124 if (!isGV(gv)) {
d9095cec 125 gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE);
c69033f2 126#ifdef PERL_DONT_CREATE_GVSV
d9095cec 127 GvSV(gv) = newSVpvn(name, namelen);
c69033f2 128#else
d9095cec 129 sv_setpvn(GvSV(gv), name, namelen);
c69033f2 130#endif
1d7c1841 131 }
5a9a79a4 132 if ((PERLDB_LINE || PERLDB_SAVESRC) && !GvAV(gv))
43e4250a 133 hv_magic(GvHVn(gv), GvAVn(gv), PERL_MAGIC_dbfile);
53d95988
CS		 134 if (tmpbuf != smallbuf)
135 Safefree(tmpbuf);
79072805
LW		 136 return gv;
137}
138
62d55b22
NC		 139/*
140=for apidoc gv_const_sv
141
142If C<gv> is a typeglob whose subroutine entry is a constant sub eligible for
143inlining, or C<gv> is a placeholder reference that would be promoted to such
144a typeglob, then returns the value returned by the sub. Otherwise, returns
145NULL.
146
147=cut
148*/
149
150SV *
151Perl_gv_const_sv(pTHX_ GV *gv)
152{
7918f24d 153 PERL_ARGS_ASSERT_GV_CONST_SV;
23491f1d 154 PERL_UNUSED_CONTEXT;
7918f24d 155
62d55b22
NC		 156 if (SvTYPE(gv) == SVt_PVGV)
157 return cv_const_sv(GvCVu(gv));
6f1b3ab0 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV ? SvRV(gv) : NULL;
62d55b22
NC		 159}
160
12816592
NC		 161GP *
162Perl_newGP(pTHX_ GV *const gv)
163{
164 GP *gp;
19bad673 165 U32 hash;
19bad673
NC		 166 const char *file;
167 STRLEN len;
2639089b 168#ifndef USE_ITHREADS
6b352265 169 GV *filegv;
2639089b 170#endif
c2587955 171 dVAR;
19bad673 172
7918f24d 173 PERL_ARGS_ASSERT_NEWGP;
2639089b
DD		 174 Newxz(gp, 1, GP);
175 gp->gp_egv = gv; /* allow compiler to reuse gv after this */
176#ifndef PERL_DONT_CREATE_GVSV
177 gp->gp_sv = newSV(0);
178#endif
7918f24d 179
c947bc1d
FC		 180 /* PL_curcop may be null here. E.g.,
181 INIT { bless {} and exit }
182 frees INIT before looking up DESTROY (and creating *DESTROY)
183 */
2639089b
DD		 184 if (PL_curcop) {
185 gp->gp_line = CopLINE(PL_curcop); /* 0 otherwise Newxz */
6e314d4f 186#ifdef USE_ITHREADS
2639089b
DD		 187 if (CopFILE(PL_curcop)) {
188 file = CopFILE(PL_curcop);
189 len = strlen(file);
190 }
2639089b 191#else
cb0d3385
FC		 192 filegv = CopFILEGV(PL_curcop);
193 if (filegv) {
194 file = GvNAME(filegv)+2;
195 len = GvNAMELEN(filegv)-2;
196 }
6e314d4f 197#endif
cb0d3385
FC		 198 else goto no_file;
199 }
200 else {
201 no_file:
19bad673
NC		 202 file = "";
203 len = 0;
204 }
f4890806
NC		 205
206 PERL_HASH(hash, file, len);
f4890806 207 gp->gp_file_hek = share_hek(file, len, hash);
12816592
NC		 208 gp->gp_refcnt = 1;
209
210 return gp;
211}
212
803f2748
DM		 213/* Assign CvGV(cv) = gv, handling weak references.
214 * See also S_anonymise_cv_maybe */
215
216void
217Perl_cvgv_set(pTHX_ CV* cv, GV* gv)
218{
219 GV * const oldgv = CvGV(cv);
b290562e 220 HEK *hek;
803f2748
DM		 221 PERL_ARGS_ASSERT_CVGV_SET;
222
223 if (oldgv == gv)
224 return;
225
226 if (oldgv) {
cfc1e951 227 if (CvCVGV_RC(cv)) {
e7881358 228 SvREFCNT_dec_NN(oldgv);
cfc1e951
DM		 229 CvCVGV_RC_off(cv);
230 }
803f2748 231 else {
803f2748
DM		 232 sv_del_backref(MUTABLE_SV(oldgv), MUTABLE_SV(cv));
233 }
234 }
b290562e 235 else if ((hek = CvNAME_HEK(cv))) unshare_hek(hek);
803f2748 236
b290562e 237 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 238 assert(!CvCVGV_RC(cv));
803f2748
DM		 239
240 if (!gv)
241 return;
242
c794ca97
DM		 243 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
244 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
245 else {
cfc1e951 246 CvCVGV_RC_on(cv);
803f2748
DM		 247 SvREFCNT_inc_simple_void_NN(gv);
248 }
803f2748
DM		 249}
250
c68d9564
Z		 251/* Assign CvSTASH(cv) = st, handling weak references. */
252
253void
254Perl_cvstash_set(pTHX_ CV *cv, HV *st)
255{
256 HV *oldst = CvSTASH(cv);
257 PERL_ARGS_ASSERT_CVSTASH_SET;
258 if (oldst == st)
259 return;
260 if (oldst)
261 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
262 SvANY(cv)->xcv_stash = st;
263 if (st)
264 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
265}
803f2748 266
e1104062
FC		 267/*
268=for apidoc gv_init_pvn
269
270Converts a scalar into a typeglob. This is an incoercible typeglob;
271assigning a reference to it will assign to one of its slots, instead of
272overwriting it as happens with typeglobs created by SvSetSV. Converting
273any scalar that is SvOK() may produce unpredictable results and is reserved
274for perl's internal use.
275
276C<gv> is the scalar to be converted.
277
278C<stash> is the parent stash/package, if any.
279
04ec7e59
FC		 280C<name> and C<len> give the name. The name must be unqualified;
281that is, it must not include the package name. If C<gv> is a
e1104062
FC		 282stash element, it is the caller's responsibility to ensure that the name
283passed to this function matches the name of the element. If it does not
284match, perl's internal bookkeeping will get out of sync.
285
04ec7e59
FC		 286C<flags> can be set to SVf_UTF8 if C<name> is a UTF8 string, or
287the return value of SvUTF8(sv). It can also take the
288GV_ADDMULTI flag, which means to pretend that the GV has been
e1104062
FC		 289seen before (i.e., suppress "Used once" warnings).
290
291=for apidoc gv_init
292
293The old form of gv_init_pvn(). It does not work with UTF8 strings, as it
04ec7e59
FC		 294has no flags parameter. If the C<multi> parameter is set, the
295GV_ADDMULTI flag will be passed to gv_init_pvn().
e1104062
FC		 296
297=for apidoc gv_init_pv
298
299Same as gv_init_pvn(), but takes a nul-terminated string for the name
300instead of separate char * and length parameters.
301
302=for apidoc gv_init_sv
303
304Same as gv_init_pvn(), but takes an SV * for the name instead of separate
305char * and length parameters. C<flags> is currently unused.
306
307=cut
308*/
309
463ee0b2 310void
04ec7e59 311Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF		 312{
313 char *namepv;
314 STRLEN namelen;
315 PERL_ARGS_ASSERT_GV_INIT_SV;
316 namepv = SvPV(namesv, namelen);
317 if (SvUTF8(namesv))
318 flags |= SVf_UTF8;
04ec7e59 319 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF		 320}
321
322void
04ec7e59 323Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF		 324{
325 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 326 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF		 327}
328
329void
04ec7e59 330Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 331{
3b6733bf
NC		 332 const U32 old_type = SvTYPE(gv);
333 const bool doproto = old_type > SVt_NULL;
f9509170 334 char * const proto = (doproto && SvPOK(gv))
dad95a0a 335 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 336 : NULL;
49a54bbe 337 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 338 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 339 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 340 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 341
e6066781 342 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC		 343 assert (!(proto && has_constant));
344
345 if (has_constant) {
5c1f4d79
NC		 346 /* The constant has to be a simple scalar type. */
347 switch (SvTYPE(has_constant)) {
5c1f4d79
NC		 348 case SVt_PVHV:
349 case SVt_PVCV:
350 case SVt_PVFM:
351 case SVt_PVIO:
352 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
353 sv_reftype(has_constant, 0));
81d52ecd 354
42d0e0b7 355 default: NOOP;
5c1f4d79 356 }
756cb477
NC		 357 SvRV_set(gv, NULL);
358 SvROK_off(gv);
359 }
463ee0b2 360
3b6733bf
NC		 361
362 if (old_type < SVt_PVGV) {
363 if (old_type >= SVt_PV)
364 SvCUR_set(gv, 0);
ad64d0ec 365 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 366 }
55d729e4
GS		 367 if (SvLEN(gv)) {
368 if (proto) {
f880fe2f 369 SvPV_set(gv, NULL);
b162af07 370 SvLEN_set(gv, 0);
55d729e4
GS		 371 SvPOK_off(gv);
372 } else
94010e71 373 Safefree(SvPVX_mutable(gv));
55d729e4 374 }
2e5b91de
NC		 375 SvIOK_off(gv);
376 isGV_with_GP_on(gv);
12816592 377
c43ae56f 378 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 379 GvSTASH(gv) = stash;
380 if (stash)
ad64d0ec 381 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 382 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 383 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
384 GvMULTI_on(gv); /* _was_ mentioned */
186a5ba8 385 if (doproto) {
e3d2b9e7 386 CV *cv;
756cb477
NC		 387 if (has_constant) {
388 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 389 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 390 /* In case op.c:S_process_special_blocks stole it: */
391 if (!GvCV(gv))
c43ae56f 392 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 393 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 394 /* If this reference was a copy of another, then the subroutine
395 must have been "imported", by a Perl space assignment to a GV
396 from a reference to CV. */
397 if (exported_constant)
398 GvIMPORTED_CV_on(gv);
186a5ba8 399 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 400 } else {
186a5ba8 401 cv = newSTUB(gv,1);
756cb477 402 }
55d729e4 403 if (proto) {
e3d2b9e7 404 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 405 SV_HAS_TRAILING_NUL);
e0260a5b 406 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 407 }
408 }
463ee0b2
LW		 409}
410
76e3520e 411STATIC void
e6066781 412S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 413{
e6066781 414 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
7918f24d 415
a0d0e21e
LW		 416 switch (sv_type) {
417 case SVt_PVIO:
418 (void)GvIOn(gv);
419 break;
420 case SVt_PVAV:
421 (void)GvAVn(gv);
422 break;
423 case SVt_PVHV:
424 (void)GvHVn(gv);
425 break;
c69033f2
NC		 426#ifdef PERL_DONT_CREATE_GVSV
427 case SVt_NULL:
428 case SVt_PVCV:
429 case SVt_PVFM:
e654831b 430 case SVt_PVGV:
c69033f2
NC		 431 break;
432 default:
dbdce04c
NC		 433 if(GvSVn(gv)) {
434 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
435 If we just cast GvSVn(gv) to void, it ignores evaluating it for
436 its side effect */
437 }
c69033f2 438#endif
a0d0e21e
LW		 439 }
440}
441
0f8d4b5e
FC		 442static void core_xsub(pTHX_ CV* cv);
443
444static GV *
445S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 446 const char * const name, const STRLEN len)
0f8d4b5e
FC		 447{
448 const int code = keyword(name, len, 1);
449 static const char file[] = __FILE__;
97021f77 450 CV *cv, *oldcompcv = NULL;
0f8d4b5e 451 int opnum = 0;
0f8d4b5e 452 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 453 COP *oldcurcop = NULL;
454 yy_parser *oldparser = NULL;
455 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 456
457 assert(gv || stash);
458 assert(name);
0f8d4b5e 459
88b892d8
FC		 460 if (!code) return NULL; /* Not a keyword */
461 switch (code < 0 ? -code : code) {
0f8d4b5e 462 /* no support for \&CORE::infix;
d885f758 463 no support for funcs that do not parse like funcs */
88b892d8 464 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 465 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 466 case KEY_default : case KEY_DESTROY:
88b892d8 467 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 468 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 469 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 470 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 471 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
472 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
473 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 474 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 475 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 476 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 477 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 478 case KEY_state: case KEY_sub :
46bef06f 479 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 480 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
481 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 482 return NULL;
483 case KEY_chdir:
eb31eb35 484 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
d51f8b19 485 case KEY_each : case KEY_eof : case KEY_exec : case KEY_exists:
0f8d4b5e
FC		 486 case KEY_keys:
487 case KEY_lstat:
488 case KEY_pop:
489 case KEY_push:
490 case KEY_shift:
a99f2ca2 491 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 492 case KEY_stat:
493 case KEY_system:
494 case KEY_truncate: case KEY_unlink:
495 case KEY_unshift:
496 case KEY_values:
497 ampable = FALSE;
498 }
499 if (!gv) {
500 gv = (GV *)newSV(0);
501 gv_init(gv, stash, name, len, TRUE);
502 }
7e68c38b 503 GvMULTI_on(gv);
0f8d4b5e
FC		 504 if (ampable) {
505 ENTER;
506 oldcurcop = PL_curcop;
507 oldparser = PL_parser;
508 lex_start(NULL, NULL, 0);
509 oldcompcv = PL_compcv;
510 PL_compcv = NULL; /* Prevent start_subparse from setting
511 CvOUTSIDE. */
512 oldsavestack_ix = start_subparse(FALSE,0);
513 cv = PL_compcv;
514 }
515 else {
516 /* Avoid calling newXS, as it calls us, and things start to
517 get hairy. */
518 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
519 GvCV_set(gv,cv);
520 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 521 CvISXSUB_on(cv);
522 CvXSUB(cv) = core_xsub;
523 }
524 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
525 from PL_curcop. */
526 (void)gv_fetchfile(file);
527 CvFILE(cv) = (char *)file;
528 /* XXX This is inefficient, as doing things this order causes
529 a prototype check in newATTRSUB. But we have to do
530 it this order as we need an op number before calling
531 new ATTRSUB. */
532 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 533 if (stash)
73c02f15 534 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 535 if (ampable) {
4428fb0e
TC		 536#ifdef DEBUGGING
537 CV *orig_cv = cv;
538#endif
0f8d4b5e 539 CvLVALUE_on(cv);
4428fb0e
TC		 540 /* newATTRSUB will free the CV and return NULL if we're still
541 compiling after a syntax error */
e8f91c91 542 if ((cv = newATTRSUB_x(
7e68c38b 543 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 544 NULL,NULL,
545 coresub_op(
546 opnum
547 ? newSVuv((UV)opnum)
548 : newSVpvn(name,len),
549 code, opnum
7e68c38b 550 ),
e8f91c91 551 TRUE
4428fb0e
TC		 552 )) != NULL) {
553 assert(GvCV(gv) == orig_cv);
554 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
555 && opnum != OP_UNDEF)
556 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
557 }
0f8d4b5e
FC		 558 LEAVE;
559 PL_parser = oldparser;
560 PL_curcop = oldcurcop;
561 PL_compcv = oldcompcv;
562 }
4428fb0e
TC		 563 if (cv) {
564 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
565 cv_set_call_checker(
566 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
567 );
568 SvREFCNT_dec(opnumsv);
569 }
570
0f8d4b5e
FC		 571 return gv;
572}
573
954c1994 574/*
6c53d59b
FC		 575=for apidoc gv_fetchmeth
576
577Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
578
e6919483
BF		 579=for apidoc gv_fetchmeth_sv
580
581Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
582of an SV instead of a string/length pair.
583
584=cut
585*/
586
587GV *
588Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
589{
590 char *namepv;
591 STRLEN namelen;
592 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
593 namepv = SvPV(namesv, namelen);
594 if (SvUTF8(namesv))
595 flags |= SVf_UTF8;
596 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
597}
598
599/*
600=for apidoc gv_fetchmeth_pv
601
602Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
603instead of a string/length pair.
604
605=cut
606*/
607
608GV *
609Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
610{
611 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
612 return gv_fetchmeth_pvn(stash, name, strlen(name), level, flags);
613}
614
615/*
616=for apidoc gv_fetchmeth_pvn
954c1994
GS		 617
618Returns the glob with the given C<name> and a defined subroutine or
619C<NULL>. The glob lives in the given C<stash>, or in the stashes
07766739 620accessible via @ISA and UNIVERSAL::.
954c1994
GS		 621
622The argument C<level> should be either 0 or -1. If C<level==0>, as a
623side-effect creates a glob with the given C<name> in the given C<stash>
624which in the case of success contains an alias for the subroutine, and sets
e1a479c5 625up caching info for this glob.
954c1994 626
aae43805
FC		 627The only significant values for C<flags> are GV_SUPER and SVf_UTF8.
628
629GV_SUPER indicates that we want to look up the method in the superclasses
630of the C<stash>.
e6919483 631
aae43805 632The
954c1994 633GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 634visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 635the GV directly; instead, you should use the method's CV, which can be
b267980d 636obtained from the GV with the C<GvCV> macro.
954c1994
GS		 637
638=cut
639*/
640
e1a479c5
BB		 641/* NOTE: No support for tied ISA */
642
79072805 643GV *
e6919483 644Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
79072805 645{
463ee0b2 646 GV** gvp;
e1a479c5
BB		 647 AV* linear_av;
648 SV** linear_svp;
649 SV* linear_sv;
aae43805 650 HV* cstash, *cachestash;
e1a479c5
BB		 651 GV* candidate = NULL;
652 CV* cand_cv = NULL;
e1a479c5 653 GV* topgv = NULL;
bfcb3514 654 const char *hvname;
e1a479c5
BB		 655 I32 create = (level >= 0) ? 1 : 0;
656 I32 items;
e1a479c5 657 U32 topgen_cmp;
04f3bf56 658 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 659
e6919483 660 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
7918f24d 661
af09ea45
IK		 662 /* UNIVERSAL methods should be callable without a stash */
663 if (!stash) {
e1a479c5 664 create = 0; /* probably appropriate */
da51bb9b 665 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 666 return 0;
667 }
668
e1a479c5
BB		 669 assert(stash);
670
bfcb3514
NC		 671 hvname = HvNAME_get(stash);
672 if (!hvname)
e1a479c5 673 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 674
e1a479c5
BB		 675 assert(hvname);
676 assert(name);
463ee0b2 677
aae43805
FC		 678 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
679 flags & GV_SUPER ? "SUPER " : "",name,hvname) );
44a8e56a 680
dd69841b 681 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 682
aae43805 683 if (flags & GV_SUPER) {
1a33a059
FC		 684 if (!HvAUX(stash)->xhv_mro_meta->super)
685 HvAUX(stash)->xhv_mro_meta->super = newHV();
686 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 687 }
688 else cachestash = stash;
689
e1a479c5 690 /* check locally for a real method or a cache entry */
aae43805
FC		 691 gvp = (GV**)hv_fetch(cachestash, name, is_utf8 ? -(I32)len : (I32)len,
692 create);
e1a479c5
BB		 693 if(gvp) {
694 topgv = *gvp;
0f8d4b5e 695 have_gv:
e1a479c5
BB		 696 assert(topgv);
697 if (SvTYPE(topgv) != SVt_PVGV)
04ec7e59 698 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 699 if ((cand_cv = GvCV(topgv))) {
700 /* If genuine method or valid cache entry, use it */
701 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
702 return topgv;
703 }
704 else {
705 /* stale cache entry, junk it and move on */
e7881358 706 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 707 GvCV_set(topgv, NULL);
708 cand_cv = NULL;
e1a479c5
BB		 709 GvCVGEN(topgv) = 0;
710 }
711 }
712 else if (GvCVGEN(topgv) == topgen_cmp) {
713 /* cache indicates no such method definitively */
714 return 0;
715 }
aae43805
FC		 716 else if (stash == cachestash
717 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 718 && strnEQ(hvname, "CORE", 4)
87566176 719 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 720 goto have_gv;
463ee0b2 721 }
79072805 722
aae43805 723 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 724 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
725 items = AvFILLp(linear_av); /* no +1, to skip over self */
726 while (items--) {
727 linear_sv = *linear_svp++;
728 assert(linear_sv);
729 cstash = gv_stashsv(linear_sv, 0);
730
dd69841b 731 if (!cstash) {
ecad31f0 732 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 733 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 734 SVfARG(linear_sv),
d0c0e7dd 735 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 736 continue;
737 }
9607fc9c 738
e1a479c5
BB		 739 assert(cstash);
740
c60dbbc3 741 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 742 if (!gvp) {
743 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
744 const char *hvname = HvNAME(cstash); assert(hvname);
745 if (strnEQ(hvname, "CORE", 4)
746 && (candidate =
87566176 747 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 748 ))
749 goto have_candidate;
750 }
751 continue;
752 }
753 else candidate = *gvp;
754 have_candidate:
e1a479c5 755 assert(candidate);
04f3bf56 756 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 757 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 758 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
759 /*
760 * Found real method, cache method in topgv if:
761 * 1. topgv has no synonyms (else inheritance crosses wires)
762 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
763 */
764 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 765 CV *old_cv = GvCV(topgv);
766 SvREFCNT_dec(old_cv);
e1a479c5 767 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 768 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 769 GvCVGEN(topgv) = topgen_cmp;
770 }
771 return candidate;
772 }
773 }
9607fc9c 774
e1a479c5
BB		 775 /* Check UNIVERSAL without caching */
776 if(level == 0 || level == -1) {
aae43805 777 candidate = gv_fetchmeth_pvn(NULL, name, len, 1, flags &~GV_SUPER);
e1a479c5
BB		 778 if(candidate) {
779 cand_cv = GvCV(candidate);
780 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 781 CV *old_cv = GvCV(topgv);
782 SvREFCNT_dec(old_cv);
e1a479c5 783 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 784 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 785 GvCVGEN(topgv) = topgen_cmp;
786 }
787 return candidate;
788 }
789 }
790
791 if (topgv && GvREFCNT(topgv) == 1) {
792 /* cache the fact that the method is not defined */
793 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 794 }
795
79072805
LW		 796 return 0;
797}
798
954c1994 799/*
460e5730
FC		 800=for apidoc gv_fetchmeth_autoload
801
802This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
803parameter.
804
d21989ed 805=for apidoc gv_fetchmeth_sv_autoload
611c1e95 806
d21989ed
BF		 807Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
808of an SV instead of a string/length pair.
809
810=cut
811*/
812
813GV *
814Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
815{
816 char *namepv;
817 STRLEN namelen;
818 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
819 namepv = SvPV(namesv, namelen);
820 if (SvUTF8(namesv))
821 flags |= SVf_UTF8;
822 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
823}
824
825/*
826=for apidoc gv_fetchmeth_pv_autoload
827
828Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
829instead of a string/length pair.
830
831=cut
832*/
833
834GV *
835Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
836{
837 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
838 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
839}
840
841/*
842=for apidoc gv_fetchmeth_pvn_autoload
843
844Same as gv_fetchmeth_pvn(), but looks for autoloaded subroutines too.
611c1e95
IZ		 845Returns a glob for the subroutine.
846
847For an autoloaded subroutine without a GV, will create a GV even
848if C<level < 0>. For an autoloaded subroutine without a stub, GvCV()
849of the result may be zero.
850
d21989ed
BF		 851Currently, the only significant value for C<flags> is SVf_UTF8.
852
611c1e95
IZ		 853=cut
854*/
855
856GV *
d21989ed 857Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 858{
499321d3 859 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 860
d21989ed 861 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 862
611c1e95 863 if (!gv) {
611c1e95
IZ		 864 CV *cv;
865 GV **gvp;
866
867 if (!stash)
6136c704 868 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 869 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 870 return NULL;
d21989ed 871 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 872 return NULL;
611c1e95
IZ		 873 cv = GvCV(gv);
874 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 875 return NULL;
611c1e95
IZ		 876 /* Have an autoload */
877 if (level < 0) /* Cannot do without a stub */
d21989ed 878 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 879 gvp = (GV**)hv_fetch(stash, name,
880 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 881 if (!gvp)
6136c704 882 return NULL;
611c1e95
IZ		 883 return *gvp;
884 }
885 return gv;
886}
887
888/*
954c1994
GS		 889=for apidoc gv_fetchmethod_autoload
890
891Returns the glob which contains the subroutine to call to invoke the method
892on the C<stash>. In fact in the presence of autoloading this may be the
893glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is
b267980d 894already setup.
954c1994
GS		 895
896The third parameter of C<gv_fetchmethod_autoload> determines whether
897AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 898means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 899Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 900with a non-zero C<autoload> parameter.
954c1994 901
cec2d7b1
FC		 902These functions grant C<"SUPER"> token
903as a prefix of the method name. Note
954c1994
GS		 904that if you want to keep the returned glob for a long time, you need to
905check for it being "AUTOLOAD", since at the later time the call may load a
cec2d7b1
FC		 906different subroutine due to $AUTOLOAD changing its value. Use the glob
907created as a side effect to do this.
954c1994 908
cec2d7b1
FC		 909These functions have the same side-effects as C<gv_fetchmeth> with
910C<level==0>. The warning against passing the GV returned by
911C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 912
913=cut
914*/
915
dc848c6f 916GV *
864dbfa3 917Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 918{
547bb267
NC		 919 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
920
256d1bb2
NC		 921 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
922}
923
44130a26
BF		 924GV *
925Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
926{
927 char *namepv;
928 STRLEN namelen;
929 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
930 namepv = SvPV(namesv, namelen);
931 if (SvUTF8(namesv))
932 flags |= SVf_UTF8;
933 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
934}
935
936GV *
937Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
938{
939 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
940 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
941}
942
256d1bb2
NC		 943/* Don't merge this yet, as it's likely to get a len parameter, and possibly
944 even a U32 hash */
945GV *
44130a26 946Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 947{
eb578fdb 948 const char *nend;
c445ea15 949 const char *nsplit = NULL;
a0d0e21e 950 GV* gv;
0dae17bd 951 HV* ostash = stash;
c94593d0 952 const char * const origname = name;
ad64d0ec 953 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 954 const U32 autoload = flags & GV_AUTOLOAD;
955 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 956 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 957
44130a26 958 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 959
eff494dd 960 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 961 stash = NULL;
c9bf4021
NC		 962 else {
963 /* The only way stash can become NULL later on is if nsplit is set,
964 which in turn means that there is no need for a SVt_PVHV case
965 the error reporting code. */
966 }
b267980d 967
44130a26 968 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 969 if (*nend == '\'') {
a0d0e21e 970 nsplit = nend;
c94593d0
NC		 971 name = nend + 1;
972 }
973 else if (*nend == ':' && *(nend + 1) == ':') {
974 nsplit = nend++;
975 name = nend + 1;
976 }
a0d0e21e
LW		 977 }
978 if (nsplit) {
7edbdc6b 979 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 980 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 981 stash = CopSTASH(PL_curcop);
982 flags |= GV_SUPER;
cea2e8a9 983 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 984 origname, HvENAME_get(stash), name) );
4633a7c4 985 }
aae43805
FC		 986 else if ((nsplit - origname) >= 7 &&
987 strnEQ(nsplit - 7, "::SUPER", 7)) {
988 /* don't autovifify if ->NoSuchStash::SUPER::method */
989 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
990 if (stash) flags |= GV_SUPER;
991 }
e189a56d 992 else {
af09ea45 993 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 994 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 995 }
0dae17bd 996 ostash = stash;
4633a7c4
LW		 997 }
998
14d1dfbd 999 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1000 if (!gv) {
2f6e0fe7 1001 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1002 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1003 else if (autoload)
c8416c26
BF		 1004 gv = gv_autoload_pvn(
1005 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1006 );
256d1bb2
NC		 1007 if (!gv && do_croak) {
1008 /* Right now this is exclusively for the benefit of S_method_common
1009 in pp_hot.c */
1010 if (stash) {
15e6cdd9
DG		 1011 /* If we can't find an IO::File method, it might be a call on
1012 * a filehandle. If IO:File has not been loaded, try to
1013 * require it first instead of croaking */
1014 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1015 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1016 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1017 STR_WITH_LEN("IO/File.pm"), 0,
1018 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1019 ) {
31b05a0f 1020 require_pv("IO/File.pm");
14d1dfbd 1021 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1022 if (gv)
1023 return gv;
1024 }
256d1bb2 1025 Perl_croak(aTHX_
b17a0679 1026 "Can't locate object method \"%"UTF8f
d0c0e7dd 1027 "\" via package \"%"HEKf"\"",
b17a0679 1028 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1029 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1030 }
1031 else {
ecad31f0 1032 SV* packnamesv;
256d1bb2 1033
256d1bb2 1034 if (nsplit) {
ecad31f0
BF		 1035 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1036 SVs_TEMP | is_utf8);
256d1bb2 1037 } else {
017c5e4e 1038 packnamesv = error_report;
256d1bb2
NC		 1039 }
1040
1041 Perl_croak(aTHX_
b17a0679
FC		 1042 "Can't locate object method \"%"UTF8f
1043 "\" via package \"%"SVf"\""
ecad31f0 1044 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1045 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1046 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1047 }
1048 }
463ee0b2 1049 }
dc848c6f 1050 else if (autoload) {
9d4ba2ae 1051 CV* const cv = GvCV(gv);
09280a33
CS		 1052 if (!CvROOT(cv) && !CvXSUB(cv)) {
1053 GV* stubgv;
1054 GV* autogv;
1055
8bfda0d7 1056 if (CvANON(cv) || !CvGV(cv))
09280a33
CS		 1057 stubgv = gv;
1058 else {
1059 stubgv = CvGV(cv);
1060 if (GvCV(stubgv) != cv) /* orphaned import */
1061 stubgv = gv;
1062 }
c8416c26
BF		 1063 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1064 GvNAME(stubgv), GvNAMELEN(stubgv),
1065 GV_AUTOLOAD_ISMETHOD
1066 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1067 if (autogv)
1068 gv = autogv;
1069 }
1070 }
44a8e56a 1071
1072 return gv;
1073}
1074
1075GV*
0eeb01b9 1076Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1077{
1078 char *namepv;
1079 STRLEN namelen;
0fe84f7c 1080 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1081 namepv = SvPV(namesv, namelen);
1082 if (SvUTF8(namesv))
1083 flags |= SVf_UTF8;
0eeb01b9 1084 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1085}
1086
1087GV*
0eeb01b9 1088Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1089{
0fe84f7c 1090 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1091 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1092}
1093
1094GV*
0eeb01b9 1095Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1096{
44a8e56a 1097 GV* gv;
1098 CV* cv;
1099 HV* varstash;
1100 GV* vargv;
1101 SV* varsv;
c8416c26
BF		 1102 SV *packname = NULL;
1103 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1104
0fe84f7c 1105 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1106
7edbdc6b 1107 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1108 return NULL;
0dae17bd
GS		 1109 if (stash) {
1110 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1111 STRLEN packname_len = 0;
1112 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1113 packname = newSVpvn_flags(packname_ptr, packname_len,
1114 SVs_TEMP | SvUTF8(stash));
5c284bb0 1115 stash = NULL;
0dae17bd 1116 }
c8416c26
BF		 1117 else
1118 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1119 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1120 }
257dc59d
FC		 1121 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1122 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1123 return NULL;
dc848c6f 1124 cv = GvCV(gv);
1125
adb5a9ae 1126 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1127 return NULL;
ed850460 1128
dc848c6f 1129 /*
1130 * Inheriting AUTOLOAD for non-methods works ... for now.
1131 */
0eeb01b9
FC		 1132 if (
1133 !(flags & GV_AUTOLOAD_ISMETHOD)
1134 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1135 )
d1d15184 1136 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1137 "Use of inherited AUTOLOAD for non-method %"SVf
1138 "::%"UTF8f"() is deprecated",
ecad31f0 1139 SVfARG(packname),
b17a0679 1140 UTF8fARG(is_utf8, len, name));
44a8e56a 1141
aed2304a 1142 if (CvISXSUB(cv)) {
bb619f37
FC		 1143 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1144 * and split that value on the last '::', pass along the same data
1145 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1146 *
1147 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1148 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1149 * type. Since SvPVX has been documented as returning the sub name
1150 * for a long time, but not as returning the prototype, we have
1151 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1152 * elsewhere.
1153 *
1154 * We put the prototype in the same allocated buffer, but after
1155 * the sub name. The SvPOK flag indicates the presence of a proto-
1156 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1157 * If both flags are on, then SvLEN is used to indicate the end of
1158 * the prototype (artificially lower than what is actually allo-
1159 * cated), at the risk of having to reallocate a few bytes unneces-
1160 * sarily--but that should happen very rarely, if ever.
1161 *
1162 * We use SvUTF8 for both prototypes and sub names, so if one is
1163 * UTF8, the other must be upgraded.
adb5a9ae 1164 */
c68d9564 1165 CvSTASH_set(cv, stash);
8fa6a409 1166 if (SvPOK(cv)) { /* Ouch! */
e7881358 1167 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1168 STRLEN ulen;
1169 const char *proto = CvPROTO(cv);
1170 assert(proto);
1171 if (SvUTF8(cv))
1172 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1173 ulen = SvCUR(tmpsv);
1174 SvCUR(tmpsv)++; /* include null in string */
1175 sv_catpvn_flags(
1176 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1177 );
1178 SvTEMP_on(tmpsv); /* Allow theft */
1179 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1180 SvTEMP_off(tmpsv);
e7881358 1181 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1182 SvLEN(cv) = SvCUR(cv) + 1;
1183 SvCUR(cv) = ulen;
1184 }
1185 else {
1186 sv_setpvn((SV *)cv, name, len);
1187 SvPOK_off(cv);
1188 if (is_utf8)
c8416c26 1189 SvUTF8_on(cv);
8fa6a409
FC		 1190 else SvUTF8_off(cv);
1191 }
1192 CvAUTOLOAD_on(cv);
adb5a9ae 1193 }
adb5a9ae 1194
44a8e56a 1195 /*
1196 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1197 * The subroutine's original name may not be "AUTOLOAD", so we don't
1198 * use that, but for lack of anything better we will use the sub's
1199 * original package to look up $AUTOLOAD.
1200 */
1201 varstash = GvSTASH(CvGV(cv));
5c7983e5 1202 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1203 ENTER;
1204
c69033f2 1205 if (!isGV(vargv)) {
04ec7e59 1206 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1207#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1208 GvSV(vargv) = newSV(0);
c69033f2
NC		 1209#endif
1210 }
3d35f11b 1211 LEAVE;
e203899d 1212 varsv = GvSVn(vargv);
4bac9ae4
CS		 1213 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1214 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1215 sv_setsv(varsv, packname);
396482e1 1216 sv_catpvs(varsv, "::");
d40bf27b
NC		 1217 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1218 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1219 sv_catpvn_flags(
1220 varsv, name, len,
5bcd1ef4 1221 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1222 );
c8416c26
BF		 1223 if (is_utf8)
1224 SvUTF8_on(varsv);
a0d0e21e
LW		 1225 return gv;
1226}
1227
44a2ac75
YO		 1228
1229/* require_tie_mod() internal routine for requiring a module
486ec47a 1230 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1231 *
1232 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1233 * "varpv" holds the name of the var, used for error messages.
1234 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1235 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1236 * are working reasonably close to as expected.
1237 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1238 * For the protection of $! to work (it is set by this routine)
1239 * the sv slot must already be magicalized.
d2c93421 1240 */
44a2ac75
YO		 1241STATIC HV*
1242S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1243{
da51bb9b 1244 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1245
7918f24d
NC		 1246 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1247
0ea03996 1248 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1249 SV *module = newSVsv(namesv);
1250 char varname = *varpv; /* varpv might be clobbered by load_module,
1251 so save it. For the moment it's always
1252 a single char. */
b82b06b8 1253 const char type = varname == '[' ? '$' : '%';
61bac25c 1254#ifdef DEBUGGING
d2c93421 1255 dSP;
61bac25c 1256#endif
d2c93421 1257 ENTER;
600beb2e 1258 SAVEFREESV(namesv);
44a2ac75 1259 if ( flags & 1 )
45cbc99a
RGS		 1260 save_scalar(gv);
1261 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1262 assert(sp == PL_stack_sp);
da51bb9b 1263 stash = gv_stashsv(namesv, 0);
44a2ac75 1264 if (!stash)
b82b06b8
FC		 1265 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1266 type, varname, SVfARG(namesv));
45cbc99a 1267 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1268 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1269 type, varname, SVfARG(namesv), methpv);
600beb2e 1270 LEAVE;
d2c93421 1271 }
e7881358 1272 else SvREFCNT_dec_NN(namesv);
44a2ac75 1273 return stash;
d2c93421
RH		 1274}
1275
954c1994
GS		 1276/*
1277=for apidoc gv_stashpv
1278
da51bb9b 1279Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1280determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1281
1282=cut
1283*/
1284
a0d0e21e 1285HV*
864dbfa3 1286Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1287{
7918f24d 1288 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1289 return gv_stashpvn(name, strlen(name), create);
1290}
1291
bc96cb06
SH		 1292/*
1293=for apidoc gv_stashpvn
1294
da51bb9b
NC		 1295Returns a pointer to the stash for a specified package. The C<namelen>
1296parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1297to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1298created if it does not already exist. If the package does not exist and
1299C<flags> is 0 (or any other setting that does not create packages) then NULL
1300is returned.
1301
566a4718
YO		 1302Flags may be one of:
1303
1304 GV_ADD
1305 SVf_UTF8
1306 GV_NOADD_NOINIT
1307 GV_NOINIT
1308 GV_NOEXPAND
1309 GV_ADDMG
1310
1311The most important of which are probably GV_ADD and SVf_UTF8.
bc96cb06
SH		 1312
1313=cut
1314*/
1315
dc437b57 1316HV*
da51bb9b 1317Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1318{
0cea0058 1319 char smallbuf[128];
46fc3d4c 1320 char *tmpbuf;
a0d0e21e
LW		 1321 HV *stash;
1322 GV *tmpgv;
add0ecde 1323 U32 tmplen = namelen + 2;
dc437b57 1324
7918f24d
NC		 1325 PERL_ARGS_ASSERT_GV_STASHPVN;
1326
add0ecde 1327 if (tmplen <= sizeof smallbuf)
46fc3d4c 1328 tmpbuf = smallbuf;
1329 else
add0ecde
VP		 1330 Newx(tmpbuf, tmplen, char);
1331 Copy(name, tmpbuf, namelen, char);
1332 tmpbuf[namelen] = ':';
1333 tmpbuf[namelen+1] = ':';
1334 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1335 if (tmpbuf != smallbuf)
1336 Safefree(tmpbuf);
a0d0e21e 1337 if (!tmpgv)
da51bb9b 1338 return NULL;
a0d0e21e 1339 stash = GvHV(tmpgv);
1f656fcf 1340 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1341 assert(stash);
1f656fcf 1342 if (!HvNAME_get(stash)) {
0be4d16f 1343 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1344
1345 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1346 /* If the containing stash has multiple effective
1347 names, see that this one gets them, too. */
1348 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1349 mro_package_moved(stash, NULL, tmpgv, 1);
1350 }
a0d0e21e 1351 return stash;
463ee0b2
LW		 1352}
1353
954c1994
GS		 1354/*
1355=for apidoc gv_stashsv
1356
da51bb9b 1357Returns a pointer to the stash for a specified package. See C<gv_stashpvn>.
954c1994
GS		 1358
1359=cut
1360*/
1361
a0d0e21e 1362HV*
da51bb9b 1363Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1364{
dc437b57 1365 STRLEN len;
9d4ba2ae 1366 const char * const ptr = SvPV_const(sv,len);
7918f24d
NC		 1367
1368 PERL_ARGS_ASSERT_GV_STASHSV;
1369
0be4d16f 1370 return gv_stashpvn(ptr, len, flags | SvUTF8(sv));
a0d0e21e
LW		 1371}
1372
1373
463ee0b2 1374GV *
fe9845cc 1375Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1376 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1377 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1378}
1379
1380GV *
fe9845cc 1381Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1382 STRLEN len;
77cb3b01
FC		 1383 const char * const nambeg =
1384 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1385 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1386 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1387}
1388
90aeefb4 1389PERL_STATIC_INLINE void
290a1700 1390S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1391{
1392 AV* av;
1393
1394 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1395
1396 av = GvAVn(gv);
1397 GvMULTI_on(gv);
1398 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1399 NULL, 0);
ad7cce9f
FR		 1400}
1401
90aeefb4
BF		 1402/* This function grabs name and tries to split a stash and glob
1403 * from its contents. TODO better description, comments
1404 *
1405 * If the function returns TRUE and 'name == name_end', then
1406 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1407 */
1408PERL_STATIC_INLINE bool
1409S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1410 STRLEN *len, const char *nambeg, STRLEN full_len,
1411 const U32 is_utf8, const I32 add)
1412{
1413 const char *name_cursor;
1414 const char *const name_end = nambeg + full_len;
1415 const char *const name_em1 = name_end - 1;
1416
1417 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1418
1419 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1420 /* accidental stringify on a GV? */
1421 (*name)++;
1422 }
1423
1424 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1425 if (name_cursor < name_em1 &&
1426 ((*name_cursor == ':' && name_cursor[1] == ':')
1427 || *name_cursor == '\''))
1428 {
1429 if (!*stash)
1430 *stash = PL_defstash;
1431 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1432 return FALSE;
1433
1434 *len = name_cursor - *name;
1435 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1436 const char *key;
1437 GV**gvp;
1438 if (*name_cursor == ':') {
1439 key = *name;
1440 *len += 2;
1441 }
1442 else {
1443 char *tmpbuf;
1444 Newx(tmpbuf, *len+2, char);
1445 Copy(*name, tmpbuf, *len, char);
1446 tmpbuf[(*len)++] = ':';
1447 tmpbuf[(*len)++] = ':';
1448 key = tmpbuf;
1449 }
c161da64 1450 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1451 *gv = gvp ? *gvp : NULL;
1452 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1453 if (SvTYPE(*gv) != SVt_PVGV)
1454 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1455 else
1456 GvMULTI_on(*gv);
1457 }
1458 if (key != *name)
1459 Safefree(key);
1460 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1461 return FALSE;
1462
1463 if (!(*stash = GvHV(*gv))) {
1464 *stash = GvHV(*gv) = newHV();
1465 if (!HvNAME_get(*stash)) {
1466 if (GvSTASH(*gv) == PL_defstash && *len == 6
1467 && strnEQ(*name, "CORE", 4))
1468 hv_name_set(*stash, "CORE", 4, 0);
1469 else
1470 hv_name_set(
1471 *stash, nambeg, name_cursor-nambeg, is_utf8
1472 );
1473 /* If the containing stash has multiple effective
1474 names, see that this one gets them, too. */
1475 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1476 mro_package_moved(*stash, NULL, *gv, 1);
1477 }
1478 }
1479 else if (!HvNAME_get(*stash))
1480 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1481 }
1482
1483 if (*name_cursor == ':')
1484 name_cursor++;
1485 *name = name_cursor+1;
1486 if (*name == name_end) {
1487 if (!*gv)
1488 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1489 return TRUE;
1490 }
1491 }
1492 }
1493 *len = name_cursor - *name;
1494 return TRUE;
1495}
1496
536d1a88 1497/* Checks if an unqualified name is in the main stash */
90aeefb4 1498PERL_STATIC_INLINE bool
536d1a88 1499S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1500{
536d1a88 1501 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1502
90aeefb4 1503 /* If it's an alphanumeric variable */
536d1a88 1504 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1505 /* Some "normal" variables are always in main::,
1506 * like INC or STDOUT.
1507 */
1508 switch (len) {
1509 case 1:
1510 if (*name == '_')
536d1a88 1511 return TRUE;
90aeefb4
BF		 1512 break;
1513 case 3:
1514 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1515 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1516 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1517 return TRUE;
90aeefb4
BF		 1518 break;
1519 case 4:
1520 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1521 && name[3] == 'V')
536d1a88 1522 return TRUE;
90aeefb4
BF		 1523 break;
1524 case 5:
1525 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1526 && name[3] == 'I' && name[4] == 'N')
536d1a88 1527 return TRUE;
90aeefb4
BF		 1528 break;
1529 case 6:
1530 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1531 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1532 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1533 return TRUE;
90aeefb4
BF		 1534 break;
1535 case 7:
1536 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1537 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1538 && name[6] == 'T')
536d1a88 1539 return TRUE;
90aeefb4
BF		 1540 break;
1541 }
536d1a88
BF		 1542 }
1543 /* *{""}, or a special variable like $@ */
1544 else
1545 return TRUE;
1546
1547 return FALSE;
1548}
1549
1550
1551/* This function is called if parse_gv_stash_name() failed to
1552 * find a stash, or if GV_NOTQUAL or an empty name was passed
1553 * to gv_fetchpvn_flags.
1554 *
1555 * It returns FALSE if the default stash can't be found nor created,
1556 * which might happen during global destruction.
1557 */
1558PERL_STATIC_INLINE bool
1559S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1560 const U32 is_utf8, const I32 add,
1561 const svtype sv_type)
1562{
1563 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1564
1565 /* No stash in name, so see how we can default */
90aeefb4 1566
536d1a88
BF		 1567 if ( gv_is_in_main(name, len, is_utf8) ) {
1568 *stash = PL_defstash;
1569 }
1570 else {
1571 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1572 *stash = PL_curstash;
1573 if (add && (PL_hints & HINT_STRICT_VARS) &&
1574 sv_type != SVt_PVCV &&
1575 sv_type != SVt_PVGV &&
1576 sv_type != SVt_PVFM &&
1577 sv_type != SVt_PVIO &&
1578 !(len == 1 && sv_type == SVt_PV &&
1579 (*name == 'a' || *name == 'b')) )
1580 {
c161da64 1581 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1582 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1583 SvTYPE(*gvp) != SVt_PVGV)
1584 {
1585 *stash = NULL;
1586 }
1587 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1588 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1589 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1590 {
1591 /* diag_listed_as: Variable "%s" is not imported%s */
1592 Perl_ck_warner_d(
1593 aTHX_ packWARN(WARN_MISC),
1594 "Variable \"%c%"UTF8f"\" is not imported",
1595 sv_type == SVt_PVAV ? '@' :
1596 sv_type == SVt_PVHV ? '%' : '$',
1597 UTF8fARG(is_utf8, len, name));
1598 if (GvCVu(*gvp))
1599 Perl_ck_warner_d(
1600 aTHX_ packWARN(WARN_MISC),
1601 "\t(Did you mean &%"UTF8f" instead?)\n",
1602 UTF8fARG(is_utf8, len, name)
1603 );
1604 *stash = NULL;
1605 }
1606 }
1607 }
1608 else {
1609 /* Use the current op's stash */
1610 *stash = CopSTASH(PL_curcop);
1611 }
1612 }
90aeefb4
BF		 1613
1614 if (!*stash) {
1615 if (add && !PL_in_clean_all) {
1616 SV * const err = Perl_mess(aTHX_
1617 "Global symbol \"%s%"UTF8f
1618 "\" requires explicit package name",
1619 (sv_type == SVt_PV ? "$"
1620 : sv_type == SVt_PVAV ? "@"
1621 : sv_type == SVt_PVHV ? "%"
1622 : ""), UTF8fARG(is_utf8, len, name));
1623 GV *gv;
1624 if (is_utf8)
1625 SvUTF8_on(err);
1626 qerror(err);
cd164bf8
BF		 1627 /* To maintain the output of errors after the strict exception
1628 * above, and to keep compat with older releases, rather than
1629 * placing the variables in the pad, we place
1630 * them in the <none>:: stash.
1631 */
90aeefb4
BF		 1632 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1633 if (!gv) {
1634 /* symbol table under destruction */
1635 return FALSE;
1636 }
1637 *stash = GvHV(gv);
1638 }
1639 else
1640 return FALSE;
1641 }
1642
1643 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1644 return FALSE;
1645
1646 return TRUE;
1647}
1648
930867a8
BF		 1649/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1650 * a new GV.
1651 * Note that it does not insert the GV into the stash prior to
1652 * magicalization, which some variables require need in order
1653 * to work (like $[, %+, %-, %!), so callers must take care of
1654 * that beforehand.
1655 *
1656 * The return value has a specific meaning for gv_fetchpvn_flags:
1657 * If it returns true, and the gv is empty, it indicates that its
1658 * refcount should be decreased.
1659 */
1660PERL_STATIC_INLINE bool
1661S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1662 bool addmg, const svtype sv_type)
79072805 1663{
960b831f 1664 SSize_t paren;
79072805 1665
930867a8 1666 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1667
44428a46 1668 if (stash != PL_defstash) { /* not the main stash */
ea238638 1669 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1670 and VERSION. All the others apply only to the main stash or to
1671 CORE (which is checked right after this). */
ea238638 1672 if (len) {
b464bac0 1673 const char * const name2 = name + 1;
cc4c2da6 1674 switch (*name) {
cc4c2da6
NC		 1675 case 'E':
1676 if (strnEQ(name2, "XPORT", 5))
1677 GvMULTI_on(gv);
1678 break;
1679 case 'I':
44428a46 1680 if (strEQ(name2, "SA"))
290a1700 1681 gv_magicalize_isa(gv);
cc4c2da6 1682 break;
44428a46
FC		 1683 case 'V':
1684 if (strEQ(name2, "ERSION"))
1685 GvMULTI_on(gv);
1686 break;
ea238638
FC		 1687 case 'a':
1688 case 'b':
1689 if (len == 1 && sv_type == SVt_PV)
1690 GvMULTI_on(gv);
924ba076 1691 /* FALLTHROUGH */
4aaa4757
FC		 1692 default:
1693 goto try_core;
1694 }
930867a8 1695 return addmg;
4aaa4757
FC		 1696 }
1697 try_core:
1698 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1699 /* Avoid null warning: */
1700 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1701 if (strnEQ(stashname, "CORE", 4))
1702 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1703 }
1704 }
1705 else if (len > 1) {
1706#ifndef EBCDIC
1707 if (*name > 'V' ) {
1708 NOOP;
1709 /* Nothing else to do.
1710 The compiler will probably turn the switch statement into a
1711 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1712 the common case of lower case variable names. (On EBCDIC
1713 platforms, we can't just do:
1714 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1715 because cases like '\027' in the switch statement below are
1716 C1 (non-ASCII) controls on those platforms, so the remapping
1717 would make them larger than 'V')
1718 */
44428a46
FC		 1719 } else
1720#endif
1721 {
1722 const char * const name2 = name + 1;
1723 switch (*name) {
1724 case 'A':
1725 if (strEQ(name2, "RGV")) {
1726 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1727 }
1728 else if (strEQ(name2, "RGVOUT")) {
1729 GvMULTI_on(gv);
1730 }
1731 break;
1732 case 'E':
1733 if (strnEQ(name2, "XPORT", 5))
1734 GvMULTI_on(gv);
1735 break;
1736 case 'I':
1737 if (strEQ(name2, "SA")) {
290a1700 1738 gv_magicalize_isa(gv);
44428a46
FC		 1739 }
1740 break;
cc4c2da6
NC		 1741 case 'S':
1742 if (strEQ(name2, "IG")) {
1743 HV *hv;
1744 I32 i;
d525a7b2
NC		 1745 if (!PL_psig_name) {
1746 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1747 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1748 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1749 } else {
1750 /* I think that the only way to get here is to re-use an
1751 embedded perl interpreter, where the previous
1752 use didn't clean up fully because
1753 PL_perl_destruct_level was 0. I'm not sure that we
1754 "support" that, in that I suspect in that scenario
1755 there are sufficient other garbage values left in the
1756 interpreter structure that something else will crash
1757 before we get here. I suspect that this is one of
1758 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1759 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1760 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1761 }
1762 GvMULTI_on(gv);
1763 hv = GvHVn(gv);
a0714e2c 1764 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1765 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1766 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1767 if (init)
1768 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1769 }
1770 }
1771 break;
1772 case 'V':
1773 if (strEQ(name2, "ERSION"))
1774 GvMULTI_on(gv);
1775 break;
e5218da5
GA		 1776 case '\003': /* $^CHILD_ERROR_NATIVE */
1777 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1778 goto magicalize;
1779 break;
cc4c2da6
NC		 1780 case '\005': /* $^ENCODING */
1781 if (strEQ(name2, "NCODING"))
1782 goto magicalize;
1783 break;
9ebf26ad
FR		 1784 case '\007': /* $^GLOBAL_PHASE */
1785 if (strEQ(name2, "LOBAL_PHASE"))
1786 goto ro_magicalize;
1787 break;
8561ea1d
FC		 1788 case '\014': /* $^LAST_FH */
1789 if (strEQ(name2, "AST_FH"))
1790 goto ro_magicalize;
1791 break;
cde0cee5 1792 case '\015': /* $^MATCH */
960b831f
NC		 1793 if (strEQ(name2, "ATCH")) {
1794 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1795 goto storeparen;
1796 }
66230c86 1797 break;
cc4c2da6
NC		 1798 case '\017': /* $^OPEN */
1799 if (strEQ(name2, "PEN"))
1800 goto magicalize;
1801 break;
cde0cee5 1802 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1803 if (strEQ(name2, "REMATCH")) {
1804 paren = RX_BUFF_IDX_CARET_PREMATCH;
1805 goto storeparen;
1806 }
1807 if (strEQ(name2, "OSTMATCH")) {
1808 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1809 goto storeparen;
1810 }
9ebf26ad 1811 break;
cc4c2da6
NC		 1812 case '\024': /* ${^TAINT} */
1813 if (strEQ(name2, "AINT"))
1814 goto ro_magicalize;
1815 break;
7cebcbc0 1816 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1817 if (strEQ(name2, "NICODE"))
cc4c2da6 1818 goto ro_magicalize;
a0288114 1819 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1820 goto ro_magicalize;
e07ea26a
NC		 1821 if (strEQ(name2, "TF8CACHE"))
1822 goto magicalize;
cc4c2da6
NC		 1823 break;
1824 case '\027': /* $^WARNING_BITS */
1825 if (strEQ(name2, "ARNING_BITS"))
1826 goto magicalize;
1827 break;
1828 case '1':
1829 case '2':
1830 case '3':
1831 case '4':
1832 case '5':
1833 case '6':
1834 case '7':
1835 case '8':
1836 case '9':
85e6fe83 1837 {
2fdbfb4d
AB		 1838 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1839 this test */
1840 /* This snippet is taken from is_gv_magical */
cc4c2da6
NC		 1841 const char *end = name + len;
1842 while (--end > name) {
930867a8
BF		 1843 if (!isDIGIT(*end))
1844 return addmg;
cc4c2da6 1845 }
960b831f
NC		 1846 paren = strtoul(name, NULL, 10);
1847 goto storeparen;
1d7c1841 1848 }
dc437b57 1849 }
93a17b20 1850 }
392db708
NC		 1851 } else {
1852 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
1853 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 1854 switch (*name) {
6361f656 1855 case '&': /* $& */
960b831f
NC		 1856 paren = RX_BUFF_IDX_FULLMATCH;
1857 goto sawampersand;
6361f656 1858 case '`': /* $` */
960b831f
NC		 1859 paren = RX_BUFF_IDX_PREMATCH;
1860 goto sawampersand;
6361f656 1861 case '\'': /* $' */
960b831f
NC		 1862 paren = RX_BUFF_IDX_POSTMATCH;
1863 sawampersand:
1a904fc8 1864#ifdef PERL_SAWAMPERSAND
a289ef89 1865 if (!(
cc4c2da6
NC		 1866 sv_type == SVt_PVAV ||
1867 sv_type == SVt_PVHV ||
1868 sv_type == SVt_PVCV ||
1869 sv_type == SVt_PVFM ||
1870 sv_type == SVt_PVIO
d3b97530
DM		 1871 )) { PL_sawampersand |=
1872 (*name == '`')
1873 ? SAWAMPERSAND_LEFT
1874 : (*name == '&')
1875 ? SAWAMPERSAND_MIDDLE
1876 : SAWAMPERSAND_RIGHT;
1877 }
1a904fc8 1878#endif
960b831f 1879 goto storeparen;
e91d8259
NC		 1880 case '1': /* $1 */
1881 case '2': /* $2 */
1882 case '3': /* $3 */
1883 case '4': /* $4 */
1884 case '5': /* $5 */
1885 case '6': /* $6 */
1886 case '7': /* $7 */
1887 case '8': /* $8 */
1888 case '9': /* $9 */
960b831f
NC		 1889 paren = *name - '0';
1890
1891 storeparen:
e91d8259
NC		 1892 /* Flag the capture variables with a NULL mg_ptr
1893 Use mg_len for the array index to lookup. */
960b831f 1894 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 1895 break;
cc4c2da6 1896
6361f656 1897 case ':': /* $: */
c69033f2 1898 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 1899 goto magicalize;
1900
6361f656 1901 case '?': /* $? */
ff0cee69 1902#ifdef COMPLEX_STATUS
c69033f2 1903 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 1904#endif
cc4c2da6 1905 goto magicalize;
ff0cee69 1906
6361f656 1907 case '!': /* $! */
67261566 1908 GvMULTI_on(gv);
44a2ac75 1909 /* If %! has been used, automatically load Errno.pm. */
d2c93421 1910
ad64d0ec 1911 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 1912
44a2ac75 1913 /* magicalization must be done before require_tie_mod is called */
67261566 1914 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 1915 {
44a2ac75 1916 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 1917 addmg = FALSE;
ffdb8bcd 1918 }
d2c93421 1919
6cef1e77 1920 break;
6361f656
AB		 1921 case '-': /* $- */
1922 case '+': /* $+ */
44a2ac75
YO		 1923 GvMULTI_on(gv); /* no used once warnings here */
1924 {
44a2ac75 1925 AV* const av = GvAVn(gv);
ad64d0ec 1926 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 1927
ad64d0ec
NC		 1928 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
1929 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 1930 if (avc)
44a2ac75 1931 SvREADONLY_on(GvSVn(gv));
44a2ac75 1932 SvREADONLY_on(av);
67261566
YO		 1933
1934 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 1935 {
192b9cd1 1936 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 1937 addmg = FALSE;
213084e4 1938 }
67261566 1939
80305961 1940 break;
cc4c2da6 1941 }
6361f656
AB		 1942 case '*': /* $* */
1943 case '#': /* $# */
9b387841 1944 if (sv_type == SVt_PV)
4f650b80 1945 /* diag_listed_as: $* is no longer supported */
9b387841 1946 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 1947 "$%c is no longer supported", *name);
8ae1fe26 1948 break;
b3ca2e83
NC		 1949 case '\010': /* $^H */
1950 {
1951 HV *const hv = GvHVn(gv);
1952 hv_magic(hv, NULL, PERL_MAGIC_hints);
1953 }
1954 goto magicalize;
b82b06b8 1955 case '[': /* $[ */
7d69d4a6 1956 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 1957 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 1958 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 1959 addmg = FALSE;
b82b06b8 1960 }
7d69d4a6 1961 else goto magicalize;
b82b06b8 1962 break;
cc4c2da6 1963 case '\023': /* $^S */
2fdbfb4d
AB		 1964 ro_magicalize:
1965 SvREADONLY_on(GvSVn(gv));
924ba076 1966 /* FALLTHROUGH */
6361f656 1967 case '0': /* $0 */
6361f656
AB		 1968 case '^': /* $^ */
1969 case '~': /* $~ */
1970 case '=': /* $= */
1971 case '%': /* $% */
1972 case '.': /* $. */
1973 case '(': /* $( */
1974 case ')': /* $) */
1975 case '<': /* $< */
1976 case '>': /* $> */
1977 case '\\': /* $\ */
1978 case '/': /* $/ */
4505a31f 1979 case '|': /* $| */
9cdac2a2 1980 case '$': /* $$ */
cc4c2da6
NC		 1981 case '\001': /* $^A */
1982 case '\003': /* $^C */
1983 case '\004': /* $^D */
1984 case '\005': /* $^E */
1985 case '\006': /* $^F */
cc4c2da6
NC		 1986 case '\011': /* $^I, NOT \t in EBCDIC */
1987 case '\016': /* $^N */
1988 case '\017': /* $^O */
1989 case '\020': /* $^P */
1990 case '\024': /* $^T */
1991 case '\027': /* $^W */
1992 magicalize:
ad64d0ec 1993 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 1994 break;
e521374c 1995
cc4c2da6 1996 case '\014': /* $^L */
76f68e9b 1997 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 1998 break;
6361f656 1999 case ';': /* $; */
76f68e9b 2000 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2001 break;
6361f656 2002 case ']': /* $] */
cc4c2da6 2003 {
3638bf15 2004 SV * const sv = GvSV(gv);
d7aa5382 2005 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2006 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2007 GvSV(gv) = vnumify(PL_patchlevel);
2008 SvREADONLY_on(GvSV(gv));
2009 SvREFCNT_dec(sv);
93a17b20
LW		 2010 }
2011 break;
cc4c2da6
NC		 2012 case '\026': /* $^V */
2013 {
3638bf15 2014 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2015 GvSV(gv) = new_version(PL_patchlevel);
2016 SvREADONLY_on(GvSV(gv));
2017 SvREFCNT_dec(sv);
16070b82
GS		 2018 }
2019 break;
ea238638
FC		 2020 case 'a':
2021 case 'b':
dc3e91f6 2022 if (sv_type == SVt_PV)
ea238638 2023 GvMULTI_on(gv);
cc4c2da6 2024 }
79072805 2025 }
930867a8
BF		 2026
2027 return addmg;
71c35c05
BF		 2028}
2029
070dc475
BF		 2030/* This function is called when the stash already holds the GV of the magic
2031 * variable we're looking for, but we need to check that it has the correct
2032 * kind of magic. For example, if someone first uses $! and then %!, the
2033 * latter would end up here, and we add the Errno tie to the HASH slot of
2034 * the *! glob.
2035 */
2036PERL_STATIC_INLINE void
2037S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2038{
2039 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2040
2041 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2042 if (*name == '!')
2043 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2044 else if (*name == '-' || *name == '+')
2045 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2046 } else if (sv_type == SVt_PV) {
2047 if (*name == '*' || *name == '#') {
2048 /* diag_listed_as: $* is no longer supported */
2049 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2050 WARN_SYNTAX),
2051 "$%c is no longer supported", *name);
2052 }
2053 }
2054 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2055 switch (*name) {
2056 case '[':
2057 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2058 break;
2059#ifdef PERL_SAWAMPERSAND
2060 case '`':
2061 PL_sawampersand |= SAWAMPERSAND_LEFT;
2062 (void)GvSVn(gv);
2063 break;
2064 case '&':
2065 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2066 (void)GvSVn(gv);
2067 break;
2068 case '\'':
2069 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2070 (void)GvSVn(gv);
2071 break;
2072#endif
2073 }
2074 }
2075}
2076
71c35c05
BF		 2077GV *
2078Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2079 const svtype sv_type)
2080{
71c35c05
BF		 2081 const char *name = nambeg;
2082 GV *gv = NULL;
2083 GV**gvp;
2084 STRLEN len;
2085 HV *stash = NULL;
2086 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2087 const I32 no_expand = flags & GV_NOEXPAND;
2088 const I32 add = flags & ~GV_NOADD_MASK;
2089 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2090 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2091 const char *const name_end = nambeg + full_len;
2092 U32 faking_it;
2093
2094 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2095
2096 /* If we have GV_NOTQUAL, the caller promised that
2097 * there is no stash, so we can skip the check.
2098 * Similarly if full_len is 0, since then we're
2099 * dealing with something like *{""} or ""->foo()
2100 */
2101 if ((flags & GV_NOTQUAL) || !full_len) {
2102 len = full_len;
2103 }
2104 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2105 if (name == name_end) return gv;
2106 }
2107 else {
2108 return NULL;
2109 }
2110
2111 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2112 return NULL;
2113 }
2114
2115 /* By this point we should have a stash and a name */
c161da64 2116 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2117 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2118 if (addmg) gv = (GV *)newSV(0);
2119 else return NULL;
2120 }
2121 else gv = *gvp, addmg = 0;
2122 /* From this point on, addmg means gv has not been inserted in the
2123 symtab yet. */
2124
2125 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2126 /* The GV already exists, so return it, but check if we need to do
2127 * anything else with it before that.
2128 */
71c35c05 2129 if (add) {
c002ae9a
BF		 2130 /* This is the heuristic that handles if a variable triggers the
2131 * 'used only once' warning. If there's already a GV in the stash
2132 * with this name, then we assume that the variable has been used
2133 * before and turn its MULTI flag on.
2134 * It's a heuristic because it can easily be "tricked", like with
2135 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2136 * not warning about $main::foo being used just once
2137 */
71c35c05
BF		 2138 GvMULTI_on(gv);
2139 gv_init_svtype(gv, sv_type);
2140 /* You reach this path once the typeglob has already been created,
2141 either by the same or a different sigil. If this path didn't
2142 exist, then (say) referencing $! first, and %! second would
2143 mean that %! was not handled correctly. */
2144 if (len == 1 && stash == PL_defstash) {
070dc475 2145 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2146 }
2147 else if (len == 3 && sv_type == SVt_PVAV
2148 && strnEQ(name, "ISA", 3)
2149 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2150 gv_magicalize_isa(gv);
2151 }
2152 return gv;
2153 } else if (no_init) {
2154 assert(!addmg);
2155 return gv;
c002ae9a
BF		 2156 }
2157 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2158 * don't expand it to a glob. This is an optimization so that things
2159 * copying constants over, like Exporter, don't have to be rewritten
2160 * to take into account that you can store more than just globs in
2161 * stashes.
2162 */
2163 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2164 assert(!addmg);
2165 return gv;
2166 }
2167
2168 /* Adding a new symbol.
2169 Unless of course there was already something non-GV here, in which case
2170 we want to behave as if there was always a GV here, containing some sort
2171 of subroutine.
2172 Otherwise we run the risk of creating things like GvIO, which can cause
2173 subtle bugs. eg the one that tripped up SQL::Translator */
2174
2175 faking_it = SvOK(gv);
2176
2177 if (add & GV_ADDWARN)
2178 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2179 "Had to create %"UTF8f" unexpectedly",
2180 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2181 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2182
9e5de6ae 2183 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2184 GvMULTI_on(gv) ;
2185
930867a8
BF		 2186 /* First, store the gv in the symtab if we're adding magic,
2187 * but only for non-empty GVs
2188 */
2189#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2190 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2191
2192 if ( addmg && !GvEMPTY(gv) ) {
2193 (void)hv_store(stash,name,len,(SV *)gv,0);
2194 }
2195
71c35c05 2196 /* set up magic where warranted */
930867a8
BF		 2197 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2198 /* See 23496c6 */
2199 if (GvEMPTY(gv)) {
2200 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2201 /* The GV was and still is "empty", except that now
2202 * it has the magic flags turned on, so we want it
2203 * stored in the symtab.
2204 */
2205 (void)hv_store(stash,name,len,(SV *)gv,0);
2206 }
2207 else {
2208 /* Most likely the temporary GV created above */
2209 SvREFCNT_dec_NN(gv);
2210 gv = NULL;
2211 }
2212 }
2213 }
71c35c05 2214
e6066781 2215 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2216 return gv;
79072805
LW		 2217}
2218
2219void
35a4481c 2220Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2221{
ed60a868 2222 const char *name;
35a4481c 2223 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2224
2225 PERL_ARGS_ASSERT_GV_FULLNAME4;
2226
666ea192 2227 sv_setpv(sv, prefix ? prefix : "");
a0288114 2228
52a6327b 2229 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2230 const STRLEN len = HvNAMELEN(hv);
2231 if (keepmain || strnNE(name, "main", len)) {
2232 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2233 sv_catpvs(sv,"::");
ed60a868 2234 }
43693395 2235 }
ed60a868 2236 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2237 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2238}
2239
2240void
35a4481c 2241Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2242{
099be4f1 2243 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2244
2245 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2246
46c461b5 2247 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2248}
2249
39a65960
DM		 2250
2251/* recursively scan a stash and any nested stashes looking for entries
2252 * that need the "only used once" warning raised
2253 */
2254
79072805 2255void
51da40ed 2256Perl_gv_check(pTHX_ HV *stash)
79072805 2257{
eb578fdb 2258 I32 i;
463ee0b2 2259
7918f24d
NC		 2260 PERL_ARGS_ASSERT_GV_CHECK;
2261
8990e307
LW		 2262 if (!HvARRAY(stash))
2263 return;
90754377
DM		 2264
2265 assert(SvOOK(stash));
90754377 2266
a0d0e21e 2267 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2268 const HE *entry;
90754377 2269 /* mark stash is being scanned, to avoid recursing */
339441ef 2270 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2271 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2272 GV *gv;
b7787f18 2273 HV *hv;
dc437b57 2274 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2275 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2276 {
90754377
DM		 2277 if (hv != PL_defstash && hv != stash
2278 && !(SvOOK(hv)
2279 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2280 )
a0d0e21e
LW		 2281 gv_check(hv); /* nested package */
2282 }
ecad31f0
BF		 2283 else if ( *HeKEY(entry) != '_'
2284 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2285 const char *file;
159b6efe 2286 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2287 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2288 continue;
1d7c1841 2289 file = GvFILE(gv);
1d7c1841 2290 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2291#ifdef USE_ITHREADS
2292 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2293#else
2294 CopFILEGV(PL_curcop)
2295 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2296#endif
9014280d 2297 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2298 "Name \"%"HEKf"::%"HEKf
2299 "\" used only once: possible typo",
2300 HEKfARG(HvNAME_HEK(stash)),
2301 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2302 }
79072805 2303 }
339441ef 2304 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2305 }
2306}
2307
2308GV *
9cc50d5b 2309Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2310{
9cc50d5b 2311 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2312 assert(!(flags & ~SVf_UTF8));
7918f24d 2313
b17a0679
FC		 2314 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2315 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2316 (long)PL_gensym++),
2317 GV_ADD, SVt_PVGV);
79072805
LW		 2318}
2319
2320/* hopefully this is only called on local symbol table entries */
2321
2322GP*
864dbfa3 2323Perl_gp_ref(pTHX_ GP *gp)
79072805 2324{
1d7c1841 2325 if (!gp)
d4c19fe8 2326 return NULL;
79072805 2327 gp->gp_refcnt++;
44a8e56a 2328 if (gp->gp_cv) {
2329 if (gp->gp_cvgen) {
e1a479c5
BB		 2330 /* If the GP they asked for a reference to contains
2331 a method cache entry, clear it first, so that we
2332 don't infect them with our cached entry */
e7881358 2333 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2334 gp->gp_cv = NULL;
44a8e56a 2335 gp->gp_cvgen = 0;
2336 }
44a8e56a 2337 }
79072805 2338 return gp;
79072805
LW		 2339}
2340
2341void
864dbfa3 2342Perl_gp_free(pTHX_ GV *gv)
79072805 2343{
79072805 2344 GP* gp;
b0d55c99 2345 int attempts = 100;
79072805 2346
f7877b28 2347 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2348 return;
f248d071 2349 if (gp->gp_refcnt == 0) {
9b387841
NC		 2350 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2351 "Attempt to free unreferenced glob pointers"
2352 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2353 return;
2354 }
4571f4a7 2355 if (gp->gp_refcnt > 1) {
bc81b34d 2356 borrowed:
748a9306
LW		 2357 if (gp->gp_egv == gv)
2358 gp->gp_egv = 0;
4571f4a7 2359 gp->gp_refcnt--;
c43ae56f 2360 GvGP_set(gv, NULL);
79072805 2361 return;
748a9306 2362 }
79072805 2363
b0d55c99
FC		 2364 while (1) {
2365 /* Copy and null out all the glob slots, so destructors do not see
2366 freed SVs. */
2367 HEK * const file_hek = gp->gp_file_hek;
2368 SV * const sv = gp->gp_sv;
2369 AV * const av = gp->gp_av;
2370 HV * const hv = gp->gp_hv;
2371 IO * const io = gp->gp_io;
2372 CV * const cv = gp->gp_cv;
2373 CV * const form = gp->gp_form;
2374
2375 gp->gp_file_hek = NULL;
2376 gp->gp_sv = NULL;
2377 gp->gp_av = NULL;
2378 gp->gp_hv = NULL;
2379 gp->gp_io = NULL;
2380 gp->gp_cv = NULL;
2381 gp->gp_form = NULL;
2382
2383 if (file_hek)
2384 unshare_hek(file_hek);
2385
2386 SvREFCNT_dec(sv);
2387 SvREFCNT_dec(av);
2388 /* FIXME - another reference loop GV -> symtab -> GV ?
2389 Somehow gp->gp_hv can end up pointing at freed garbage. */
2390 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2391 const HEK *hvname_hek = HvNAME_HEK(hv);
10bafe90 2392 DEBUG_o(Perl_deb(aTHX_ "gp_free clearing PL_stashcache for '%"HEKf"'\n", HEKfARG(hvname_hek)));
c2242065 2393 if (PL_stashcache && hvname_hek)
0ca9877d 2394 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
b0d55c99
FC		 2395 SvREFCNT_dec(hv);
2396 }
2397 SvREFCNT_dec(io);
2398 SvREFCNT_dec(cv);
2399 SvREFCNT_dec(form);
2400
bc81b34d
FC		 2401 /* Possibly reallocated by a destructor */
2402 gp = GvGP(gv);
2403
b0d55c99
FC		 2404 if (!gp->gp_file_hek
2405 && !gp->gp_sv
2406 && !gp->gp_av
2407 && !gp->gp_hv
2408 && !gp->gp_io
2409 && !gp->gp_cv
2410 && !gp->gp_form) break;
2411
2412 if (--attempts == 0) {
2413 Perl_die(aTHX_
2414 "panic: gp_free failed to free glob pointer - "
2415 "something is repeatedly re-creating entries"
2416 );
2417 }
13207a71 2418 }
748a9306 2419
bc81b34d
FC		 2420 /* Possibly incremented by a destructor doing glob assignment */
2421 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2422 Safefree(gp);
c43ae56f 2423 GvGP_set(gv, NULL);
79072805
LW		 2424}
2425
d460ef45
NIS		 2426int
2427Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2428{
53c1dcc0
AL		 2429 AMT * const amtp = (AMT*)mg->mg_ptr;
2430 PERL_UNUSED_ARG(sv);
dd374669 2431
7918f24d
NC		 2432 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2433
d460ef45
NIS		 2434 if (amtp && AMT_AMAGIC(amtp)) {
2435 int i;
2436 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2437 CV * const cv = amtp->table[i];
b37c2d43 2438 if (cv) {
e7881358 2439 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2440 amtp->table[i] = NULL;
d460ef45
NIS		 2441 }
2442 }
2443 }
2444 return 0;
2445}
2446
a0d0e21e 2447/* Updates and caches the CV's */
c3a9a790
RGS		 2448/* Returns:
2449 * 1 on success and there is some overload
2450 * 0 if there is no overload
2451 * -1 if some error occurred and it couldn't croak
2452 */
a0d0e21e 2453
c3a9a790 2454int
242f8760 2455Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2456{
ad64d0ec 2457 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2458 AMT amt;
9b439311 2459 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2460 U32 newgen;
a0d0e21e 2461
7918f24d
NC		 2462 PERL_ARGS_ASSERT_GV_AMUPDATE;
2463
9b439311 2464 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2465 if (mg) {
2466 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2467 if (amtp->was_ok_sub == newgen) {
8c34e50d 2468 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2469 }
ad64d0ec 2470 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2471 }
a0d0e21e 2472
bfcb3514 2473 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2474
d460ef45 2475 Zero(&amt,1,AMT);
e1a479c5 2476 amt.was_ok_sub = newgen;
a6006777 2477 amt.fallback = AMGfallNO;
2478 amt.flags = 0;
2479
a6006777 2480 {
8c34e50d
FC		 2481 int filled = 0;
2482 int i;
3d147ac2
DM		 2483 bool deref_seen = 0;
2484
a6006777 2485
3866ea3b 2486 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2487
89ffc314 2488 /* Try to find via inheritance. */
e6919483 2489 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2490 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2491 CV* cv;
89ffc314
IZ		 2492
2493 if (!gv)
3866ea3b
FC		 2494 {
2495 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2496 goto no_table;
3866ea3b
FC		 2497 }
2498#ifdef PERL_DONT_CREATE_GVSV
2499 else if (!sv) {
6f207bd3 2500 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2501 }
2502#endif
79c9643d
JL		 2503 else if (SvTRUE(sv))
2504 /* don't need to set overloading here because fallback => 1
2505 * is the default setting for classes without overloading */
89ffc314 2506 amt.fallback=AMGfallYES;
79c9643d
JL		 2507 else if (SvOK(sv)) {
2508 amt.fallback=AMGfallNEVER;
386a5489 2509 filled = 1;
386a5489 2510 }
79c9643d 2511 else {
386a5489 2512 filled = 1;
386a5489 2513 }
a6006777 2514
3d147ac2 2515 assert(SvOOK(stash));
3d147ac2 2516 /* initially assume the worst */
339441ef 2517 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2518
8c34e50d 2519 for (i = 1; i < NofAMmeth; i++) {
6136c704 2520 const char * const cooky = PL_AMG_names[i];
32251b26 2521 /* Human-readable form, for debugging: */
8c34e50d 2522 const char * const cp = AMG_id2name(i);
d279ab82 2523 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2524
a0288114 2525 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2526 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2527 /* don't fill the cache while looking up!
2528 Creation of inheritance stubs in intermediate packages may
2529 conflict with the logic of runtime method substitution.
2530 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2531 then we could have created stubs for "(+0" in A and C too.
2532 But if B overloads "bool", we may want to use it for
2533 numifying instead of C's "+0". */
8c34e50d 2534 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2535 cv = 0;
89ffc314 2536 if (gv && (cv = GvCV(gv))) {
f0e9f182
FC		 2537 if(GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil")){
2538 const char * const hvname = HvNAME_get(GvSTASH(CvGV(cv)));
2539 if (hvname && HEK_LEN(HvNAME_HEK(GvSTASH(CvGV(cv)))) == 8
2540 && strEQ(hvname, "overload")) {
611c1e95
IZ		 2541 /* This is a hack to support autoloading..., while
2542 knowing *which* methods were declared as overloaded. */
44a8e56a 2543 /* GvSV contains the name of the method. */
6136c704 2544 GV *ngv = NULL;
c69033f2 2545 SV *gvsv = GvSV(gv);
a0288114
AL		 2546
2547 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2548 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2549 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2550 if (!gvsv || !SvPOK(gvsv)
7f415459 2551 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2552 {
a0288114 2553 /* Can be an import stub (created by "can"). */
242f8760 2554 if (destructing) {
c3a9a790 2555 return -1;
242f8760
RGS		 2556 }
2557 else {
d66cca07
BF		 2558 const SV * const name = (gvsv && SvPOK(gvsv))
2559 ? gvsv
2560 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2561 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2562 Perl_croak(aTHX_ "%s method \"%"SVf256
2563 "\" overloading \"%s\" "\
d0c0e7dd 2564 "in package \"%"HEKf256"\"",
242f8760
RGS		 2565 (GvCVGEN(gv) ? "Stub found while resolving"
2566 : "Can't resolve"),
d66cca07 2567 SVfARG(name), cp,
d0c0e7dd 2568 HEKfARG(
d66cca07 2569 HvNAME_HEK(stash)
d0c0e7dd 2570 ));
242f8760 2571 }
44a8e56a 2572 }
dc848c6f 2573 cv = GvCV(gv = ngv);
f0e9f182 2574 }
44a8e56a 2575 }
b464bac0 2576 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2577 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2578 GvNAME(CvGV(cv))) );
2579 filled = 1;
611c1e95 2580 } else if (gv) { /* Autoloaded... */
ea726b52 2581 cv = MUTABLE_CV(gv);
611c1e95 2582 filled = 1;
44a8e56a 2583 }
ea726b52 2584 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2585
2586 if (gv) {
2587 switch (i) {
2588 case to_sv_amg:
2589 case to_av_amg:
2590 case to_hv_amg:
2591 case to_gv_amg:
2592 case to_cv_amg:
2593 case nomethod_amg:
2594 deref_seen = 1;
2595 break;
2596 }
2597 }
a0d0e21e 2598 }
3d147ac2 2599 if (!deref_seen)
45479970
DM		 2600 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2601 * NB - aux var invalid here, HvARRAY() could have been
2602 * reallocated since it was assigned to */
2603 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2604
a0d0e21e 2605 if (filled) {
a6006777 2606 AMT_AMAGIC_on(&amt);
ad64d0ec 2607 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2608 (char*)&amt, sizeof(AMT));
8c34e50d 2609 return TRUE;
a0d0e21e
LW		 2610 }
2611 }
a6006777 2612 /* Here we have no table: */
8c34e50d 2613 no_table:
a6006777 2614 AMT_AMAGIC_off(&amt);
ad64d0ec 2615 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2616 (char*)&amt, sizeof(AMTS));
c3a9a790 2617 return 0;
a0d0e21e
LW		 2618}
2619
32251b26
IZ		 2620
2621CV*
2622Perl_gv_handler(pTHX_ HV *stash, I32 id)
2623{
3f8f4626 2624 MAGIC *mg;
32251b26 2625 AMT *amtp;
e1a479c5 2626 U32 newgen;
9b439311 2627 struct mro_meta* stash_meta;
32251b26 2628
bfcb3514 2629 if (!stash || !HvNAME_get(stash))
601f1833 2630 return NULL;
e1a479c5 2631
9b439311
BB		 2632 stash_meta = HvMROMETA(stash);
2633 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2634
ad64d0ec 2635 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2636 if (!mg) {
2637 do_update:
8c34e50d 2638 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2639 return NULL;
ad64d0ec 2640 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2641 }
a9fd4e40 2642 assert(mg);
32251b26 2643 amtp = (AMT*)mg->mg_ptr;
66978156 2644 if ( amtp->was_ok_sub != newgen )
32251b26 2645 goto do_update;
3ad83ce7 2646 if (AMT_AMAGIC(amtp)) {
b7787f18 2647 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2648 if (ret && isGV(ret)) { /* Autoloading stab */
2649 /* Passing it through may have resulted in a warning
2650 "Inherited AUTOLOAD for a non-method deprecated", since
2651 our caller is going through a function call, not a method call.
2652 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2653 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2654
2655 if (gv && GvCV(gv))
2656 return GvCV(gv);
2657 }
2658 return ret;
2659 }
a0288114 2660
601f1833 2661 return NULL;
32251b26
IZ		 2662}
2663
2664
6f1401dc
DM		 2665/* Implement tryAMAGICun_MG macro.
2666 Do get magic, then see if the stack arg is overloaded and if so call it.
2667 Flags:
2668 AMGf_set return the arg using SETs rather than assigning to
2669 the targ
2670 AMGf_numeric apply sv_2num to the stack arg.
2671*/
2672
2673bool
2674Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2675 dSP;
2676 SV* tmpsv;
2677 SV* const arg = TOPs;
2678
2679 SvGETMAGIC(arg);
2680
9f8bf298
NC		 2681 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
2682 AMGf_noright | AMGf_unary))) {
6f1401dc
DM		 2683 if (flags & AMGf_set) {
2684 SETs(tmpsv);
2685 }
2686 else {
2687 dTARGET;
2688 if (SvPADMY(TARG)) {
2689 sv_setsv(TARG, tmpsv);
2690 SETTARG;
2691 }
2692 else
2693 SETs(tmpsv);
2694 }
2695 PUTBACK;
2696 return TRUE;
2697 }
2698
2699 if ((flags & AMGf_numeric) && SvROK(arg))
2700 *sp = sv_2num(arg);
2701 return FALSE;
2702}
2703
2704
2705/* Implement tryAMAGICbin_MG macro.
2706 Do get magic, then see if the two stack args are overloaded and if so
2707 call it.
2708 Flags:
2709 AMGf_set return the arg using SETs rather than assigning to
2710 the targ
2711 AMGf_assign op may be called as mutator (eg +=)
2712 AMGf_numeric apply sv_2num to the stack arg.
2713*/
2714
2715bool
2716Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2717 dSP;
2718 SV* const left = TOPm1s;
2719 SV* const right = TOPs;
2720
2721 SvGETMAGIC(left);
2722 if (left != right)
2723 SvGETMAGIC(right);
2724
2725 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2726 SV * const tmpsv = amagic_call(left, right, method,
2727 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0));
2728 if (tmpsv) {
2729 if (flags & AMGf_set) {
2730 (void)POPs;
2731 SETs(tmpsv);
2732 }
2733 else {
2734 dATARGET;
2735 (void)POPs;
2736 if (opASSIGN || SvPADMY(TARG)) {
2737 sv_setsv(TARG, tmpsv);
2738 SETTARG;
2739 }
2740 else
2741 SETs(tmpsv);
2742 }
2743 PUTBACK;
2744 return TRUE;
2745 }
2746 }
75ea7a12
FC		 2747 if(left==right && SvGMAGICAL(left)) {
2748 SV * const left = sv_newmortal();
2749 *(sp-1) = left;
2750 /* Print the uninitialized warning now, so it includes the vari-
2751 able name. */
2752 if (!SvOK(right)) {
2753 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2754 sv_setsv_flags(left, &PL_sv_no, 0);
2755 }
2756 else sv_setsv_flags(left, right, 0);
2757 SvGETMAGIC(right);
2758 }
6f1401dc 2759 if (flags & AMGf_numeric) {
75ea7a12
FC		 2760 if (SvROK(TOPm1s))
2761 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2762 if (SvROK(right))
2763 *sp = sv_2num(right);
2764 }
2765 return FALSE;
2766}
2767
25a9ffce
NC		 2768SV *
2769Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2770 SV *tmpsv = NULL;
3d147ac2 2771 HV *stash;
25a9ffce
NC		 2772
2773 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2774
3d147ac2
DM		 2775 if (!SvAMAGIC(ref))
2776 return ref;
2777 /* return quickly if none of the deref ops are overloaded */
2778 stash = SvSTASH(SvRV(ref));
2779 assert(SvOOK(stash));
2780 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2781 return ref;
2782
2783 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2784 AMGf_noright | AMGf_unary))) {
2785 if (!SvROK(tmpsv))
2786 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2787 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2788 /* Bail out if it returns us the same reference. */
2789 return tmpsv;
2790 }
2791 ref = tmpsv;
3d147ac2
DM		 2792 if (!SvAMAGIC(ref))
2793 break;
25a9ffce
NC		 2794 }
2795 return tmpsv ? tmpsv : ref;
2796}
6f1401dc 2797
8d569291
FC		 2798bool
2799Perl_amagic_is_enabled(pTHX_ int method)
2800{
2801 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2802
2803 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2804
2805 if ( !lex_mask || !SvOK(lex_mask) )
2806 /* overloading lexically disabled */
2807 return FALSE;
2808 else if ( lex_mask && SvPOK(lex_mask) ) {
2809 /* we have an entry in the hints hash, check if method has been
2810 * masked by overloading.pm */
2811 STRLEN len;
2812 const int offset = method / 8;
2813 const int bit = method % 8;
2814 char *pv = SvPV(lex_mask, len);
2815
2816 /* Bit set, so this overloading operator is disabled */
2817 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2818 return FALSE;
2819 }
2820 return TRUE;
2821}
2822
a0d0e21e 2823SV*
864dbfa3 2824Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2825{
27da23d5 2826 dVAR;
b267980d 2827 MAGIC *mg;
9c5ffd7c 2828 CV *cv=NULL;
a0d0e21e 2829 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 2830 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 2831 int off = 0, off1, lr = 0, notfound = 0;
2832 int postpr = 0, force_cpy = 0;
2833 int assign = AMGf_assign & flags;
2834 const int assignshift = assign ? 1 : 0;
bf5522a1 2835 int use_default_op = 0;
67288365 2836 int force_scalar = 0;
497b47a8
JH		 2837#ifdef DEBUGGING
2838 int fl=0;
497b47a8 2839#endif
25716404 2840 HV* stash=NULL;
7918f24d
NC		 2841
2842 PERL_ARGS_ASSERT_AMAGIC_CALL;
2843
e46c382e 2844 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 2845 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 2846 }
2847
a0d0e21e 2848 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 2849 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 2850 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2851 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2852 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2853 : NULL))
b267980d 2854 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 2855 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
2856 * usual method */
497b47a8
JH		 2857 (
2858#ifdef DEBUGGING
2859 fl = 1,
a0288114 2860#endif
497b47a8 2861 cv = cvp[off=method])))) {
a0d0e21e
LW		 2862 lr = -1; /* Call method for left argument */
2863 } else {
2864 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
2865 int logic;
2866
2867 /* look for substituted methods */
ee239bfe 2868 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 2869 switch (method) {
2870 case inc_amg:
ee239bfe
IZ		 2871 force_cpy = 1;
2872 if ((cv = cvp[off=add_ass_amg])
2873 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 2874 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2875 }
2876 break;
2877 case dec_amg:
ee239bfe
IZ		 2878 force_cpy = 1;
2879 if ((cv = cvp[off = subtr_ass_amg])
2880 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 2881 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 2882 }
2883 break;
2884 case bool__amg:
2885 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
2886 break;
2887 case numer_amg:
2888 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
2889 break;
2890 case string_amg:
2891 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
2892 break;
b7787f18
AL		 2893 case not_amg:
2894 (void)((cv = cvp[off=bool__amg])
2895 || (cv = cvp[off=numer_amg])
2896 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 2897 if (cv)
2898 postpr = 1;
b7787f18 2899 break;
748a9306
LW		 2900 case copy_amg:
2901 {
76e3520e
GS		 2902 /*
2903 * SV* ref causes confusion with the interpreter variable of
2904 * the same name
2905 */
890ce7af 2906 SV* const tmpRef=SvRV(left);
76e3520e 2907 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 2908 /*
2909 * Just to be extra cautious. Maybe in some
2910 * additional cases sv_setsv is safe, too.
2911 */
890ce7af 2912 SV* const newref = newSVsv(tmpRef);
748a9306 2913 SvOBJECT_on(newref);
a1cd65be
FC		 2914 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
2915 delegate to the stash. */
85fbaab2 2916 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 2917 return newref;
2918 }
2919 }
2920 break;
a0d0e21e 2921 case abs_amg:
b267980d 2922 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 2923 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 2924 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 2925 if (off1==lt_amg) {
890ce7af 2926 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2927 lt_amg,AMGf_noright);
2928 logic = SvTRUE(lessp);
2929 } else {
890ce7af 2930 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 2931 ncmp_amg,AMGf_noright);
2932 logic = (SvNV(lessp) < 0);
2933 }
2934 if (logic) {
2935 if (off==subtr_amg) {
2936 right = left;
748a9306 2937 left = nullsv;
a0d0e21e
LW		 2938 lr = 1;
2939 }
2940 } else {
2941 return left;
2942 }
2943 }
2944 break;
2945 case neg_amg:
155aba94 2946 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 2947 right = left;
2948 left = sv_2mortal(newSViv(0));
2949 lr = 1;
2950 }
2951 break;
f216259d 2952 case int_amg:
f5284f61 2953 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 2954 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 2955 case regexp_amg:
b267980d
NIS		 2956 /* FAIL safe */
2957 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 2958
f5284f61
IZ		 2959 case to_sv_amg:
2960 case to_av_amg:
2961 case to_hv_amg:
2962 case to_gv_amg:
2963 case to_cv_amg:
2964 /* FAIL safe */
b267980d 2965 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 2966
a0d0e21e
LW		 2967 default:
2968 goto not_found;
2969 }
2970 if (!cv) goto not_found;
2971 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 2972 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 2973 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 2974 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 2975 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 2976 : NULL))
69815d08
RS		 2977 && (cv = cvp[off=method])) { /* Method for right
2978 * argument found */
2979 lr=1;
bf5522a1
MB		 2980 } else if (((cvp && amtp->fallback > AMGfallNEVER)
2981 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 2982 && !(flags & AMGf_unary)) {
2983 /* We look for substitution for
2984 * comparison operations and
fc36a67e 2985 * concatenation */
a0d0e21e
LW		 2986 if (method==concat_amg || method==concat_ass_amg
2987 || method==repeat_amg || method==repeat_ass_amg) {
2988 return NULL; /* Delegate operation to string conversion */
2989 }
2990 off = -1;
2991 switch (method) {
2992 case lt_amg:
2993 case le_amg:
2994 case gt_amg:
2995 case ge_amg:
2996 case eq_amg:
2997 case ne_amg:
2ab54efd
MB		 2998 off = ncmp_amg;
2999 break;
a0d0e21e
LW		 3000 case slt_amg:
3001 case sle_amg:
3002 case sgt_amg:
3003 case sge_amg:
3004 case seq_amg:
3005 case sne_amg:
2ab54efd
MB		 3006 off = scmp_amg;
3007 break;
a0d0e21e 3008 }
bf5522a1
MB		 3009 if (off != -1) {
3010 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3011 cv = ocvp[off];
3012 lr = -1;
3013 }
3014 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3015 cv = cvp[off];
3016 lr = 1;
3017 }
3018 }
3019 if (cv)
2ab54efd
MB		 3020 postpr = 1;
3021 else
3022 goto not_found;
a0d0e21e 3023 } else {
a6006777 3024 not_found: /* No method found, either report or croak */
b267980d
NIS		 3025 switch (method) {
3026 case to_sv_amg:
3027 case to_av_amg:
3028 case to_hv_amg:
3029 case to_gv_amg:
3030 case to_cv_amg:
3031 /* FAIL safe */
3032 return left; /* Delegate operation to standard mechanisms. */
b267980d 3033 }
a0d0e21e
LW		 3034 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3035 notfound = 1; lr = -1;
3036 } else if (cvp && (cv=cvp[nomethod_amg])) {
3037 notfound = 1; lr = 1;
bf5522a1
MB		 3038 } else if ((use_default_op =
3039 (!ocvp || oamtp->fallback >= AMGfallYES)
3040 && (!cvp || amtp->fallback >= AMGfallYES))
3041 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3042 /* Skip generating the "no method found" message. */
3043 return NULL;
a0d0e21e 3044 } else {
46fc3d4c 3045 SV *msg;
774d564b 3046 if (off==-1) off=method;
b267980d 3047 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3048 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3049 AMG_id2name(method + assignshift),
3050 (flags & AMGf_unary ? " " : "\n\tleft "),
3051 SvAMAGIC(left)?
3052 "in overloaded package ":
3053 "has no overloaded magic",
3054 SvAMAGIC(left)?
3055 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3056 SVfARG(&PL_sv_no),
3057 SvAMAGIC(right)?
3058 ",\n\tright argument in overloaded package ":
3059 (flags & AMGf_unary
3060 ? ""
3061 : ",\n\tright argument has no overloaded magic"),
3062 SvAMAGIC(right)?
3063 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3064 SVfARG(&PL_sv_no)));
bf5522a1 3065 if (use_default_op) {
d66cca07 3066 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3067 } else {
be2597df 3068 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3069 }
3070 return NULL;
3071 }
ee239bfe 3072 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3073 }
3074 }
67288365
JL		 3075
3076 switch (method) {
3077 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3078 * operation. we need this to return a value, so that it can be assigned
3079 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3080 * increment or decrement was itself called in void context */
3081 case inc_amg:
3082 if (off == add_amg)
3083 force_scalar = 1;
3084 break;
3085 case dec_amg:
3086 if (off == subtr_amg)
3087 force_scalar = 1;
3088 break;
3089 /* in these cases, we're calling an assignment variant of an operator
3090 * (+= rather than +, for instance). regardless of whether it's a
3091 * fallback or not, it always has to return a value, which will be
3092 * assigned to the proper variable later */
3093 case add_amg:
3094 case subtr_amg:
3095 case mult_amg:
3096 case div_amg:
3097 case modulo_amg:
3098 case pow_amg:
3099 case lshift_amg:
3100 case rshift_amg:
3101 case repeat_amg:
3102 case concat_amg:
3103 case band_amg:
3104 case bor_amg:
3105 case bxor_amg:
3106 if (assign)
3107 force_scalar = 1;
3108 break;
3109 /* the copy constructor always needs to return a value */
3110 case copy_amg:
3111 force_scalar = 1;
3112 break;
3113 /* because of the way these are implemented (they don't perform the
3114 * dereferencing themselves, they return a reference that perl then
3115 * dereferences later), they always have to be in scalar context */
3116 case to_sv_amg:
3117 case to_av_amg:
3118 case to_hv_amg:
3119 case to_gv_amg:
3120 case to_cv_amg:
3121 force_scalar = 1;
3122 break;
3123 /* these don't have an op of their own; they're triggered by their parent
3124 * op, so the context there isn't meaningful ('$a and foo()' in void
3125 * context still needs to pass scalar context on to $a's bool overload) */
3126 case bool__amg:
3127 case numer_amg:
3128 case string_amg:
3129 force_scalar = 1;
3130 break;
3131 }
3132
497b47a8 3133#ifdef DEBUGGING
a0d0e21e 3134 if (!notfound) {
497b47a8 3135 DEBUG_o(Perl_deb(aTHX_
d66cca07 3136 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3137 AMG_id2name(off),
3138 method+assignshift==off? "" :
a0288114 3139 " (initially \"",
497b47a8
JH		 3140 method+assignshift==off? "" :
3141 AMG_id2name(method+assignshift),
a0288114 3142 method+assignshift==off? "" : "\")",
497b47a8
JH		 3143 flags & AMGf_unary? "" :
3144 lr==1 ? " for right argument": " for left argument",
3145 flags & AMGf_unary? " for argument" : "",
d66cca07 3146 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3147 fl? ",\n\tassignment variant used": "") );
ee239bfe 3148 }
497b47a8 3149#endif
748a9306
LW		 3150 /* Since we use shallow copy during assignment, we need
3151 * to dublicate the contents, probably calling user-supplied
3152 * version of copy operator
3153 */
ee239bfe
IZ		 3154 /* We need to copy in following cases:
3155 * a) Assignment form was called.
3156 * assignshift==1, assign==T, method + 1 == off
3157 * b) Increment or decrement, called directly.
3158 * assignshift==0, assign==0, method + 0 == off
3159 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3160 * assignshift==0, assign==T,
ee239bfe
IZ		 3161 * force_cpy == T
3162 * d) Increment or decrement, translated to nomethod.
b267980d 3163 * assignshift==0, assign==0,
ee239bfe
IZ		 3164 * force_cpy == T
3165 * e) Assignment form translated to nomethod.
3166 * assignshift==1, assign==T, method + 1 != off
3167 * force_cpy == T
3168 */
3169 /* off is method, method+assignshift, or a result of opcode substitution.
3170 * In the latter case assignshift==0, so only notfound case is important.
3171 */
73512201 3172 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3173 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3174 || force_cpy) )
6f1401dc 3175 {
1b38c28e
NC		 3176 /* newSVsv does not behave as advertised, so we copy missing
3177 * information by hand */
3178 SV *tmpRef = SvRV(left);
3179 SV *rv_copy;
31d632c3 3180 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3181 SvRV_set(left, rv_copy);
3182 SvSETMAGIC(left);
e7881358 3183 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3184 }
6f1401dc
DM		 3185 }
3186
a0d0e21e
LW		 3187 {
3188 dSP;
3189 BINOP myop;
3190 SV* res;
b7787f18 3191 const bool oldcatch = CATCH_GET;
67288365
JL		 3192 I32 oldmark, nret;
3193 int gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3194
54310121 3195 CATCH_SET(TRUE);
a0d0e21e
LW		 3196 Zero(&myop, 1, BINOP);
3197 myop.op_last = (OP *) &myop;
b37c2d43 3198 myop.op_next = NULL;
67288365
JL		 3199 myop.op_flags = OPf_STACKED;
3200
3201 switch (gimme) {
3202 case G_VOID:
3203 myop.op_flags |= OPf_WANT_VOID;
3204 break;
3205 case G_ARRAY:
3206 if (flags & AMGf_want_list) {
3207 myop.op_flags |= OPf_WANT_LIST;
3208 break;
3209 }
3210 /* FALLTHROUGH */
3211 default:
3212 myop.op_flags |= OPf_WANT_SCALAR;
3213 break;
3214 }
a0d0e21e 3215
e788e7d3 3216 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3217 ENTER;
462e5cf6 3218 SAVEOP();
533c011a 3219 PL_op = (OP *) &myop;
3280af22 3220 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3221 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3222 Perl_pp_pushmark(aTHX);
a0d0e21e 3223
924508f0 3224 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3225 PUSHs(lr>0? right: left);
3226 PUSHs(lr>0? left: right);
3280af22 3227 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3228 if (notfound) {
59cd0e26
NC		 3229 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3230 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3231 }
ad64d0ec 3232 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3233 PUTBACK;
67288365 3234 oldmark = TOPMARK;
a0d0e21e 3235
139d0ce6 3236 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3237 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3238 LEAVE;
3239 SPAGAIN;
67288365
JL		 3240 nret = SP - (PL_stack_base + oldmark);
3241
3242 switch (gimme) {
3243 case G_VOID:
3244 /* returning NULL has another meaning, and we check the context
3245 * at the call site too, so this can be differentiated from the
3246 * scalar case */
3247 res = &PL_sv_undef;
3248 SP = PL_stack_base + oldmark;
3249 break;
3250 case G_ARRAY: {
3251 if (flags & AMGf_want_list) {
3252 res = sv_2mortal((SV *)newAV());
3253 av_extend((AV *)res, nret);
3254 while (nret--)
3255 av_store((AV *)res, nret, POPs);
3256 break;
3257 }
3258 /* FALLTHROUGH */
3259 }
3260 default:
3261 res = POPs;
3262 break;
3263 }
a0d0e21e 3264
ebafeae7 3265 PUTBACK;
d3acc0f7 3266 POPSTACK;
54310121 3267 CATCH_SET(oldcatch);
a0d0e21e 3268
a0d0e21e 3269 if (postpr) {
b7787f18 3270 int ans;
a0d0e21e
LW		 3271 switch (method) {
3272 case le_amg:
3273 case sle_amg:
3274 ans=SvIV(res)<=0; break;
3275 case lt_amg:
3276 case slt_amg:
3277 ans=SvIV(res)<0; break;
3278 case ge_amg:
3279 case sge_amg:
3280 ans=SvIV(res)>=0; break;
3281 case gt_amg:
3282 case sgt_amg:
3283 ans=SvIV(res)>0; break;
3284 case eq_amg:
3285 case seq_amg:
3286 ans=SvIV(res)==0; break;
3287 case ne_amg:
3288 case sne_amg:
3289 ans=SvIV(res)!=0; break;
3290 case inc_amg:
3291 case dec_amg:
bbce6d69 3292 SvSetSV(left,res); return left;
dc437b57 3293 case not_amg:
fe7ac86a 3294 ans=!SvTRUE(res); break;
b7787f18
AL		 3295 default:
3296 ans=0; break;
a0d0e21e 3297 }
54310121 3298 return boolSV(ans);
748a9306
LW		 3299 } else if (method==copy_amg) {
3300 if (!SvROK(res)) {
cea2e8a9 3301 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3302 }
3303 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3304 } else {
3305 return res;
3306 }
3307 }
3308}
c9d5ac95 3309
f5c1e807
NC		 3310void
3311Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3312{
3313 dVAR;
acda4c6a 3314 U32 hash;
f5c1e807 3315
7918f24d 3316 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3317
acda4c6a
NC		 3318 if (len > I32_MAX)
3319 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3320
ae8cc45f
NC		 3321 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3322 unshare_hek(GvNAME_HEK(gv));
3323 }
3324
acda4c6a 3325 PERL_HASH(hash, name, len);
c60dbbc3 3326 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3327}
3328
66610fdd 3329/*
f7461760
Z		 3330=for apidoc gv_try_downgrade
3331
2867cdbc
Z		 3332If the typeglob C<gv> can be expressed more succinctly, by having
3333something other than a real GV in its place in the stash, replace it
3334with the optimised form. Basic requirements for this are that C<gv>
3335is a real typeglob, is sufficiently ordinary, and is only referenced
3336from its package. This function is meant to be used when a GV has been
3337looked up in part to see what was there, causing upgrading, but based
3338on what was found it turns out that the real GV isn't required after all.
3339
3340If C<gv> is a completely empty typeglob, it is deleted from the stash.
3341
3342If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3343sub, the typeglob is replaced with a scalar-reference placeholder that
3344more compactly represents the same thing.
f7461760
Z		 3345
3346=cut
3347*/
3348
3349void
3350Perl_gv_try_downgrade(pTHX_ GV *gv)
3351{
3352 HV *stash;
3353 CV *cv;
3354 HEK *namehek;
3355 SV **gvp;
3356 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3357
3358 /* XXX Why and where does this leave dangling pointers during global
3359 destruction? */
627364f1 3360 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3361
2867cdbc 3362 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3363 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3364 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3365 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3366 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3367 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3368 return;
2be08ad1
FC		 3369 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3370 return;
803f2748
DM		 3371 if (SvMAGICAL(gv)) {
3372 MAGIC *mg;
3373 /* only backref magic is allowed */
3374 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3375 return;
3376 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3377 if (mg->mg_type != PERL_MAGIC_backref)
3378 return;
3379 }
3380 }
2867cdbc
Z		 3381 cv = GvCV(gv);
3382 if (!cv) {
3383 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3384 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3385 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760
Z		 3386 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
3387 CvSTASH(cv) == stash && CvGV(cv) == gv &&
3388 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3389 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3390 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3391 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3392 *gvp == (SV*)gv) {
3393 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3394 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3395 SvREFCNT(gv) = 0;
3396 sv_clear((SV*)gv);
3397 SvREFCNT(gv) = 1;
70e5f2b5 3398 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
f7461760
Z		 3399 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3400 STRUCT_OFFSET(XPVIV, xiv_iv));
3401 SvRV_set(gv, value);
3402 }
3403}
3404
9e3fb20c
FC		 3405GV *
3406Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3407{
3408 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3409 GV * const *gvp;
3410 PERL_ARGS_ASSERT_GV_OVERRIDE;
3411 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3412 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3413 gv = gvp ? *gvp : NULL;
3414 if (gv && !isGV(gv)) {
3415 if (!SvPCS_IMPORTED(gv)) return NULL;
3416 gv_init(gv, PL_globalstash, name, len, 0);
3417 return gv;
3418 }
3419 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3420}
3421
4aaa4757
FC		 3422#include "XSUB.h"
3423
3424static void
3425core_xsub(pTHX_ CV* cv)
3426{
3427 Perl_croak(aTHX_
3428 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3429 );
3430}
3431
f7461760 3432/*
66610fdd
RGS		 3433 * Local variables:
3434 * c-indentation-style: bsd
3435 * c-basic-offset: 4
14d04a33 3436 * indent-tabs-mode: nil
66610fdd
RGS		 3437 * End:
3438 *
14d04a33 3439 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3440 */
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