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t/lib/overload_fallback.t: tests for RT #43356
[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"
6ffcffbd 37#include "overload.inc"
4aaa4757 38#include "keywords.h"
2846acbf 39#include "feature.h"
79072805 40
f54cb97a 41static const char S_autoload[] = "AUTOLOAD";
3c81f0b3 42#define S_autolen (sizeof("AUTOLOAD")-1)
5c7983e5 43
13c59d41
MH		 44GV *
45Perl_gv_add_by_type(pTHX_ GV *gv, svtype type)
c69033f2 46{
d5713896 47 SV **where;
7918f24d 48
13c59d41
MH		 49 if (
50 !gv
51 || (
52 SvTYPE((const SV *)gv) != SVt_PVGV
13be902c 53 && SvTYPE((const SV *)gv) != SVt_PVLV
13c59d41 54 )
13be902c 55 ) {
bb85b28a 56 const char *what;
13c59d41 57 if (type == SVt_PVIO) {
bb85b28a
NC		 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";
13c59d41 64 } else if (type == SVt_PVHV) {
bb85b28a
NC		 65 what = "hash";
66 } else {
13c59d41 67 what = type == SVt_PVAV ? "array" : "scalar";
bb85b28a 68 }
de6f7947 69 /* diag_listed_as: Bad symbol for filehandle */
bb85b28a
NC		 70 Perl_croak(aTHX_ "Bad symbol for %s", what);
71 }
d5713896 72
13c59d41
MH		 73 if (type == SVt_PVHV) {
74 where = (SV **)&GvHV(gv);
75 } else if (type == SVt_PVAV) {
76 where = (SV **)&GvAV(gv);
77 } else if (type == SVt_PVIO) {
78 where = (SV **)&GvIOp(gv);
79 } else {
80 where = &GvSV(gv);
81 }
7918f24d 82
13c59d41
MH		 83 if (!*where)
84 {
85 *where = newSV_type(type);
86 if (type == SVt_PVAV && GvNAMELEN(gv) == 3
4c4f3c46 87 && strEQs(GvNAME(gv), "ISA"))
13c59d41 88 sv_magic(*where, (SV *)gv, PERL_MAGIC_isa, NULL, 0);
e17aed30 89 }
13c59d41 90 return gv;
79072805
LW		 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 }
c7a622b3 132 if (PERLDB_LINE_OR_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
796b6530 145C<NULL>.
62d55b22
NC		 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));
16a6e5a4 158 return SvROK(gv) && SvTYPE(SvRV(gv)) != SVt_PVAV && SvTYPE(SvRV(gv)) != SVt_PVCV ? 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{
ae77754a 219 GV * const oldgv = CvNAMED(cv) ? NULL : SvANY(cv)->xcv_gv_u.xcv_gv;
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 }
db5cc3ee
FC		 235 else if ((hek = CvNAME_HEK(cv))) {
236 unshare_hek(hek);
f3feca7a 237 CvLEXICAL_off(cv);
db5cc3ee 238 }
803f2748 239
5988f306 240 CvNAMED_off(cv);
b290562e 241 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
c794ca97 242 assert(!CvCVGV_RC(cv));
803f2748
DM		 243
244 if (!gv)
245 return;
246
c794ca97
DM		 247 if (isGV_with_GP(gv) && GvGP(gv) && (GvCV(gv) == cv || GvFORM(gv) == cv))
248 Perl_sv_add_backref(aTHX_ MUTABLE_SV(gv), MUTABLE_SV(cv));
249 else {
cfc1e951 250 CvCVGV_RC_on(cv);
803f2748
DM		 251 SvREFCNT_inc_simple_void_NN(gv);
252 }
803f2748
DM		 253}
254
ae77754a
FC		 255/* Convert CvSTASH + CvNAME_HEK into a GV. Conceptually, all subs have a
256 GV, but for efficiency that GV may not in fact exist. This function,
257 called by CvGV, reifies it. */
258
259GV *
260Perl_cvgv_from_hek(pTHX_ CV *cv)
261{
262 GV *gv;
2eaf799e 263 SV **svp;
ae77754a
FC		 264 PERL_ARGS_ASSERT_CVGV_FROM_HEK;
265 assert(SvTYPE(cv) == SVt_PVCV);
266 if (!CvSTASH(cv)) return NULL;
267 ASSUME(CvNAME_HEK(cv));
2eaf799e
FC		 268 svp = hv_fetchhek(CvSTASH(cv), CvNAME_HEK(cv), 0);
269 gv = MUTABLE_GV(svp && *svp ? *svp : newSV(0));
270 if (!isGV(gv))
271 gv_init_pvn(gv, CvSTASH(cv), HEK_KEY(CvNAME_HEK(cv)),
ae77754a
FC		 272 HEK_LEN(CvNAME_HEK(cv)),
273 SVf_UTF8 * !!HEK_UTF8(CvNAME_HEK(cv)));
2eaf799e
FC		 274 if (!CvNAMED(cv)) { /* gv_init took care of it */
275 assert (SvANY(cv)->xcv_gv_u.xcv_gv == gv);
276 return gv;
277 }
ae77754a
FC		 278 unshare_hek(CvNAME_HEK(cv));
279 CvNAMED_off(cv);
280 SvANY(cv)->xcv_gv_u.xcv_gv = gv;
2eaf799e 281 if (svp && *svp) SvREFCNT_inc_simple_void_NN(gv);
ae77754a
FC		 282 CvCVGV_RC_on(cv);
283 return gv;
284}
285
c68d9564
Z		 286/* Assign CvSTASH(cv) = st, handling weak references. */
287
288void
289Perl_cvstash_set(pTHX_ CV *cv, HV *st)
290{
291 HV *oldst = CvSTASH(cv);
292 PERL_ARGS_ASSERT_CVSTASH_SET;
293 if (oldst == st)
294 return;
295 if (oldst)
296 sv_del_backref(MUTABLE_SV(oldst), MUTABLE_SV(cv));
297 SvANY(cv)->xcv_stash = st;
298 if (st)
299 Perl_sv_add_backref(aTHX_ MUTABLE_SV(st), MUTABLE_SV(cv));
300}
803f2748 301
e1104062
FC		 302/*
303=for apidoc gv_init_pvn
304
305Converts a scalar into a typeglob. This is an incoercible typeglob;
306assigning a reference to it will assign to one of its slots, instead of
796b6530
KW		 307overwriting it as happens with typeglobs created by C<SvSetSV>. Converting
308any scalar that is C<SvOK()> may produce unpredictable results and is reserved
e1104062
FC		 309for perl's internal use.
310
311C<gv> is the scalar to be converted.
312
313C<stash> is the parent stash/package, if any.
314
04ec7e59
FC		 315C<name> and C<len> give the name. The name must be unqualified;
316that is, it must not include the package name. If C<gv> is a
e1104062
FC		 317stash element, it is the caller's responsibility to ensure that the name
318passed to this function matches the name of the element. If it does not
319match, perl's internal bookkeeping will get out of sync.
320
4a4088c4 321C<flags> can be set to C<SVf_UTF8> if C<name> is a UTF-8 string, or
04ec7e59 322the return value of SvUTF8(sv). It can also take the
796b6530 323C<GV_ADDMULTI> flag, which means to pretend that the GV has been
e1104062
FC		 324seen before (i.e., suppress "Used once" warnings).
325
326=for apidoc gv_init
327
4a4088c4 328The old form of C<gv_init_pvn()>. It does not work with UTF-8 strings, as it
04ec7e59 329has no flags parameter. If the C<multi> parameter is set, the
796b6530 330C<GV_ADDMULTI> flag will be passed to C<gv_init_pvn()>.
e1104062
FC		 331
332=for apidoc gv_init_pv
333
796b6530 334Same as C<gv_init_pvn()>, but takes a nul-terminated string for the name
e1104062
FC		 335instead of separate char * and length parameters.
336
337=for apidoc gv_init_sv
338
796b6530 339Same as C<gv_init_pvn()>, but takes an SV * for the name instead of separate
e1104062
FC		 340char * and length parameters. C<flags> is currently unused.
341
342=cut
343*/
344
463ee0b2 345void
04ec7e59 346Perl_gv_init_sv(pTHX_ GV *gv, HV *stash, SV* namesv, U32 flags)
e6066781
BF		 347{
348 char *namepv;
349 STRLEN namelen;
350 PERL_ARGS_ASSERT_GV_INIT_SV;
351 namepv = SvPV(namesv, namelen);
352 if (SvUTF8(namesv))
353 flags |= SVf_UTF8;
04ec7e59 354 gv_init_pvn(gv, stash, namepv, namelen, flags);
e6066781
BF		 355}
356
357void
04ec7e59 358Perl_gv_init_pv(pTHX_ GV *gv, HV *stash, const char *name, U32 flags)
e6066781
BF		 359{
360 PERL_ARGS_ASSERT_GV_INIT_PV;
04ec7e59 361 gv_init_pvn(gv, stash, name, strlen(name), flags);
e6066781
BF		 362}
363
364void
04ec7e59 365Perl_gv_init_pvn(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, U32 flags)
463ee0b2 366{
3b6733bf
NC		 367 const U32 old_type = SvTYPE(gv);
368 const bool doproto = old_type > SVt_NULL;
f9509170 369 char * const proto = (doproto && SvPOK(gv))
dad95a0a 370 ? ((void)(SvIsCOW(gv) && (sv_force_normal((SV *)gv), 0)), SvPVX(gv))
f9509170 371 : NULL;
49a54bbe 372 const STRLEN protolen = proto ? SvCUR(gv) : 0;
e0260a5b 373 const U32 proto_utf8 = proto ? SvUTF8(gv) : 0;
756cb477 374 SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL;
1ccdb730 375 const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0;
756cb477 376
e6066781 377 PERL_ARGS_ASSERT_GV_INIT_PVN;
756cb477
NC		 378 assert (!(proto && has_constant));
379
380 if (has_constant) {
2eaf799e 381 /* The constant has to be a scalar, array or subroutine. */
5c1f4d79 382 switch (SvTYPE(has_constant)) {
5c1f4d79 383 case SVt_PVHV:
5c1f4d79
NC		 384 case SVt_PVFM:
385 case SVt_PVIO:
386 Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob",
387 sv_reftype(has_constant, 0));
4bbde2f7 388 break;
81d52ecd 389
42d0e0b7 390 default: NOOP;
5c1f4d79 391 }
756cb477
NC		 392 SvRV_set(gv, NULL);
393 SvROK_off(gv);
394 }
463ee0b2 395
3b6733bf
NC		 396
397 if (old_type < SVt_PVGV) {
398 if (old_type >= SVt_PV)
399 SvCUR_set(gv, 0);
ad64d0ec 400 sv_upgrade(MUTABLE_SV(gv), SVt_PVGV);
3b6733bf 401 }
55d729e4
GS		 402 if (SvLEN(gv)) {
403 if (proto) {
f880fe2f 404 SvPV_set(gv, NULL);
b162af07 405 SvLEN_set(gv, 0);
55d729e4
GS		 406 SvPOK_off(gv);
407 } else
94010e71 408 Safefree(SvPVX_mutable(gv));
55d729e4 409 }
2e5b91de
NC		 410 SvIOK_off(gv);
411 isGV_with_GP_on(gv);
12816592 412
c43ae56f 413 GvGP_set(gv, Perl_newGP(aTHX_ gv));
e15faf7d
NC		 414 GvSTASH(gv) = stash;
415 if (stash)
ad64d0ec 416 Perl_sv_add_backref(aTHX_ MUTABLE_SV(stash), MUTABLE_SV(gv));
04f3bf56 417 gv_name_set(gv, name, len, GV_ADD | ( flags & SVf_UTF8 ? SVf_UTF8 : 0 ));
04ec7e59
FC		 418 if (flags & GV_ADDMULTI || doproto) /* doproto means it */
419 GvMULTI_on(gv); /* _was_ mentioned */
2eaf799e
FC		 420 if (has_constant && SvTYPE(has_constant) == SVt_PVCV) {
421 /* Not actually a constant. Just a regular sub. */
422 CV * const cv = (CV *)has_constant;
423 GvCV_set(gv,cv);
424 if (CvSTASH(cv) == stash && (
425 CvNAME_HEK(cv) == GvNAME_HEK(gv)
426 || ( HEK_LEN(CvNAME_HEK(cv)) == HEK_LEN(GvNAME_HEK(gv))
427 && HEK_FLAGS(CvNAME_HEK(cv)) != HEK_FLAGS(GvNAME_HEK(gv))
428 && HEK_UTF8(CvNAME_HEK(cv)) == HEK_UTF8(GvNAME_HEK(gv))
429 && memEQ(HEK_KEY(CvNAME_HEK(cv)), GvNAME(gv), GvNAMELEN(gv))
430 )
431 ))
432 CvGV_set(cv,gv);
433 }
434 else if (doproto) {
e3d2b9e7 435 CV *cv;
756cb477
NC		 436 if (has_constant) {
437 /* newCONSTSUB takes ownership of the reference from us. */
e38acfd7 438 cv = newCONSTSUB_flags(stash, name, len, flags, has_constant);
75bd28cf
FC		 439 /* In case op.c:S_process_special_blocks stole it: */
440 if (!GvCV(gv))
c43ae56f 441 GvCV_set(gv, (CV *)SvREFCNT_inc_simple_NN(cv));
439cdf38 442 assert(GvCV(gv) == cv); /* newCONSTSUB should have set this */
1ccdb730
NC		 443 /* If this reference was a copy of another, then the subroutine
444 must have been "imported", by a Perl space assignment to a GV
445 from a reference to CV. */
446 if (exported_constant)
447 GvIMPORTED_CV_on(gv);
186a5ba8 448 CvSTASH_set(cv, PL_curstash); /* XXX Why is this needed? */
756cb477 449 } else {
186a5ba8 450 cv = newSTUB(gv,1);
756cb477 451 }
55d729e4 452 if (proto) {
e3d2b9e7 453 sv_usepvn_flags(MUTABLE_SV(cv), proto, protolen,
49a54bbe 454 SV_HAS_TRAILING_NUL);
e0260a5b 455 if ( proto_utf8 ) SvUTF8_on(MUTABLE_SV(cv));
55d729e4
GS		 456 }
457 }
463ee0b2
LW		 458}
459
76e3520e 460STATIC void
e6066781 461S_gv_init_svtype(pTHX_ GV *gv, const svtype sv_type)
a0d0e21e 462{
13c59d41
MH		 463 PERL_ARGS_ASSERT_GV_INIT_SVTYPE;
464
465 switch (sv_type) {
466 case SVt_PVIO:
467 (void)GvIOn(gv);
468 break;
469 case SVt_PVAV:
470 (void)GvAVn(gv);
471 break;
472 case SVt_PVHV:
473 (void)GvHVn(gv);
474 break;
c69033f2 475#ifdef PERL_DONT_CREATE_GVSV
13c59d41
MH		 476 case SVt_NULL:
477 case SVt_PVCV:
478 case SVt_PVFM:
479 case SVt_PVGV:
480 break;
481 default:
482 if(GvSVn(gv)) {
483 /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13
484 If we just cast GvSVn(gv) to void, it ignores evaluating it for
485 its side effect */
486 }
c69033f2 487#endif
a0d0e21e
LW		 488 }
489}
490
0f8d4b5e
FC		 491static void core_xsub(pTHX_ CV* cv);
492
493static GV *
494S_maybe_add_coresub(pTHX_ HV * const stash, GV *gv,
87566176 495 const char * const name, const STRLEN len)
0f8d4b5e
FC		 496{
497 const int code = keyword(name, len, 1);
498 static const char file[] = __FILE__;
97021f77 499 CV *cv, *oldcompcv = NULL;
0f8d4b5e 500 int opnum = 0;
0f8d4b5e 501 bool ampable = TRUE; /* &{}-able */
97021f77
FC		 502 COP *oldcurcop = NULL;
503 yy_parser *oldparser = NULL;
504 I32 oldsavestack_ix = 0;
0f8d4b5e
FC		 505
506 assert(gv || stash);
507 assert(name);
0f8d4b5e 508
88b892d8
FC		 509 if (!code) return NULL; /* Not a keyword */
510 switch (code < 0 ? -code : code) {
0f8d4b5e 511 /* no support for \&CORE::infix;
d885f758 512 no support for funcs that do not parse like funcs */
88b892d8 513 case KEY___DATA__: case KEY___END__: case KEY_and: case KEY_AUTOLOAD:
a96df643 514 case KEY_BEGIN : case KEY_CHECK : case KEY_cmp:
eb31eb35 515 case KEY_default : case KEY_DESTROY:
88b892d8 516 case KEY_do : case KEY_dump : case KEY_else : case KEY_elsif :
d51f8b19 517 case KEY_END : case KEY_eq : case KEY_eval :
88b892d8 518 case KEY_for : case KEY_foreach: case KEY_format: case KEY_ge :
498a02d8 519 case KEY_given : case KEY_goto : case KEY_grep :
88b892d8
FC		 520 case KEY_gt : case KEY_if: case KEY_INIT: case KEY_last: case KEY_le:
521 case KEY_local: case KEY_lt: case KEY_m : case KEY_map : case KEY_my:
522 case KEY_ne : case KEY_next : case KEY_no: case KEY_or: case KEY_our:
1efec5ed 523 case KEY_package: case KEY_print: case KEY_printf:
919ad5f7 524 case KEY_q : case KEY_qq : case KEY_qr : case KEY_qw :
88b892d8 525 case KEY_qx : case KEY_redo : case KEY_require: case KEY_return:
d33bb3da 526 case KEY_s : case KEY_say : case KEY_sort :
d80ed303 527 case KEY_state: case KEY_sub :
46bef06f 528 case KEY_tr : case KEY_UNITCHECK: case KEY_unless:
88b892d8
FC		 529 case KEY_until: case KEY_use : case KEY_when : case KEY_while :
530 case KEY_x : case KEY_xor : case KEY_y :
0f8d4b5e
FC		 531 return NULL;
532 case KEY_chdir:
eb31eb35 533 case KEY_chomp: case KEY_chop: case KEY_defined: case KEY_delete:
73665bc4 534 case KEY_eof : case KEY_exec: case KEY_exists :
0f8d4b5e 535 case KEY_lstat:
bea284c8 536 case KEY_split:
0f8d4b5e
FC		 537 case KEY_stat:
538 case KEY_system:
539 case KEY_truncate: case KEY_unlink:
0f8d4b5e
FC		 540 ampable = FALSE;
541 }
542 if (!gv) {
543 gv = (GV *)newSV(0);
544 gv_init(gv, stash, name, len, TRUE);
545 }
7e68c38b 546 GvMULTI_on(gv);
0f8d4b5e
FC		 547 if (ampable) {
548 ENTER;
549 oldcurcop = PL_curcop;
550 oldparser = PL_parser;
551 lex_start(NULL, NULL, 0);
552 oldcompcv = PL_compcv;
553 PL_compcv = NULL; /* Prevent start_subparse from setting
554 CvOUTSIDE. */
555 oldsavestack_ix = start_subparse(FALSE,0);
556 cv = PL_compcv;
557 }
558 else {
559 /* Avoid calling newXS, as it calls us, and things start to
560 get hairy. */
561 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
562 GvCV_set(gv,cv);
563 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 564 CvISXSUB_on(cv);
565 CvXSUB(cv) = core_xsub;
eacbb379 566 PoisonPADLIST(cv);
0f8d4b5e
FC		 567 }
568 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
569 from PL_curcop. */
9b669ea1
DD		 570 /* XSUBs can't be perl lang/perl5db.pl debugged
571 if (PERLDB_LINE_OR_SAVESRC)
572 (void)gv_fetchfile(file); */
0f8d4b5e
FC		 573 CvFILE(cv) = (char *)file;
574 /* XXX This is inefficient, as doing things this order causes
575 a prototype check in newATTRSUB. But we have to do
576 it this order as we need an op number before calling
577 new ATTRSUB. */
578 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 579 if (stash)
73c02f15 580 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 581 if (ampable) {
4428fb0e
TC		 582#ifdef DEBUGGING
583 CV *orig_cv = cv;
584#endif
0f8d4b5e 585 CvLVALUE_on(cv);
4428fb0e
TC		 586 /* newATTRSUB will free the CV and return NULL if we're still
587 compiling after a syntax error */
e8f91c91 588 if ((cv = newATTRSUB_x(
7e68c38b 589 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 590 NULL,NULL,
591 coresub_op(
592 opnum
593 ? newSVuv((UV)opnum)
594 : newSVpvn(name,len),
595 code, opnum
7e68c38b 596 ),
e8f91c91 597 TRUE
4428fb0e
TC		 598 )) != NULL) {
599 assert(GvCV(gv) == orig_cv);
600 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
cd642408 601 && opnum != OP_UNDEF && opnum != OP_KEYS)
4428fb0e
TC		 602 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
603 }
0f8d4b5e
FC		 604 LEAVE;
605 PL_parser = oldparser;
606 PL_curcop = oldcurcop;
607 PL_compcv = oldcompcv;
608 }
4428fb0e
TC		 609 if (cv) {
610 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
611 cv_set_call_checker(
612 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
613 );
614 SvREFCNT_dec(opnumsv);
615 }
616
0f8d4b5e
FC		 617 return gv;
618}
619
954c1994 620/*
6c53d59b
FC		 621=for apidoc gv_fetchmeth
622
623Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
624
e6919483
BF		 625=for apidoc gv_fetchmeth_sv
626
627Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
628of an SV instead of a string/length pair.
629
630=cut
631*/
632
633GV *
634Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
635{
c290e187 636 char *namepv;
637 STRLEN namelen;
638 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
639 if (LIKELY(SvPOK_nog(namesv))) /* common case */
640 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
641 namepv = SvPV(namesv, namelen);
642 if (SvUTF8(namesv)) flags |= SVf_UTF8;
643 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF		 644}
645
646/*
647=for apidoc gv_fetchmeth_pv
648
649Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
650instead of a string/length pair.
651
652=cut
653*/
654
655GV *
656Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
657{
658 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 659 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF		 660}
661
662/*
663=for apidoc gv_fetchmeth_pvn
954c1994
GS		 664
665Returns the glob with the given C<name> and a defined subroutine or
666C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 667accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS		 668
669The argument C<level> should be either 0 or -1. If C<level==0>, as a
670side-effect creates a glob with the given C<name> in the given C<stash>
671which in the case of success contains an alias for the subroutine, and sets
e1a479c5 672up caching info for this glob.
954c1994 673
796b6530 674The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 675
796b6530 676C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 677of the C<stash>.
e6919483 678
aae43805 679The
954c1994 680GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 681visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 682the GV directly; instead, you should use the method's CV, which can be
b267980d 683obtained from the GV with the C<GvCV> macro.
954c1994
GS		 684
685=cut
686*/
687
e1a479c5
BB		 688/* NOTE: No support for tied ISA */
689
c6afe666 690PERL_STATIC_INLINE GV*
691S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 692{
463ee0b2 693 GV** gvp;
c6afe666 694 HE* he;
e1a479c5
BB		 695 AV* linear_av;
696 SV** linear_svp;
697 SV* linear_sv;
aae43805 698 HV* cstash, *cachestash;
e1a479c5
BB		 699 GV* candidate = NULL;
700 CV* cand_cv = NULL;
e1a479c5 701 GV* topgv = NULL;
bfcb3514 702 const char *hvname;
c6afe666 703 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 704 I32 items;
e1a479c5 705 U32 topgen_cmp;
04f3bf56 706 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 707
af09ea45
IK		 708 /* UNIVERSAL methods should be callable without a stash */
709 if (!stash) {
e1a479c5 710 create = 0; /* probably appropriate */
da51bb9b 711 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 712 return 0;
713 }
714
e1a479c5
BB		 715 assert(stash);
716
bfcb3514
NC		 717 hvname = HvNAME_get(stash);
718 if (!hvname)
e1a479c5 719 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 720
e1a479c5 721 assert(hvname);
55df6700 722 assert(name || meth);
463ee0b2 723
aae43805 724 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC		 725 flags & GV_SUPER ? "SUPER " : "",
726 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 727
dd69841b 728 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 729
aae43805 730 if (flags & GV_SUPER) {
1a33a059
FC		 731 if (!HvAUX(stash)->xhv_mro_meta->super)
732 HvAUX(stash)->xhv_mro_meta->super = newHV();
733 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 734 }
735 else cachestash = stash;
736
e1a479c5 737 /* check locally for a real method or a cache entry */
c6afe666 738 he = (HE*)hv_common(
739 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
740 );
741 if (he) gvp = (GV**)&HeVAL(he);
742 else gvp = NULL;
743
e1a479c5
BB		 744 if(gvp) {
745 topgv = *gvp;
0f8d4b5e 746 have_gv:
e1a479c5
BB		 747 assert(topgv);
748 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC		 749 {
750 if (!name)
751 name = SvPV_nomg(meth, len);
04ec7e59 752 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 753 }
e1a479c5
BB		 754 if ((cand_cv = GvCV(topgv))) {
755 /* If genuine method or valid cache entry, use it */
756 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
757 return topgv;
758 }
759 else {
760 /* stale cache entry, junk it and move on */
e7881358 761 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 762 GvCV_set(topgv, NULL);
763 cand_cv = NULL;
e1a479c5
BB		 764 GvCVGEN(topgv) = 0;
765 }
766 }
767 else if (GvCVGEN(topgv) == topgen_cmp) {
768 /* cache indicates no such method definitively */
769 return 0;
770 }
aae43805
FC		 771 else if (stash == cachestash
772 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
4c4f3c46 773 && strEQs(hvname, "CORE")
87566176 774 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 775 goto have_gv;
463ee0b2 776 }
79072805 777
aae43805 778 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 779 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
780 items = AvFILLp(linear_av); /* no +1, to skip over self */
781 while (items--) {
782 linear_sv = *linear_svp++;
783 assert(linear_sv);
784 cstash = gv_stashsv(linear_sv, 0);
785
dd69841b 786 if (!cstash) {
ecad31f0 787 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 788 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 789 SVfARG(linear_sv),
d0c0e7dd 790 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 791 continue;
792 }
9607fc9c 793
e1a479c5
BB		 794 assert(cstash);
795
c60dbbc3 796 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 797 if (!gvp) {
798 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
799 const char *hvname = HvNAME(cstash); assert(hvname);
4c4f3c46 800 if (strEQs(hvname, "CORE")
0f8d4b5e 801 && (candidate =
87566176 802 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 803 ))
804 goto have_candidate;
805 }
806 continue;
807 }
808 else candidate = *gvp;
809 have_candidate:
e1a479c5 810 assert(candidate);
04f3bf56 811 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 812 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 813 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
814 /*
815 * Found real method, cache method in topgv if:
816 * 1. topgv has no synonyms (else inheritance crosses wires)
817 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
818 */
819 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 820 CV *old_cv = GvCV(topgv);
821 SvREFCNT_dec(old_cv);
e1a479c5 822 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 823 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 824 GvCVGEN(topgv) = topgen_cmp;
825 }
826 return candidate;
827 }
828 }
9607fc9c 829
e1a479c5
BB		 830 /* Check UNIVERSAL without caching */
831 if(level == 0 || level == -1) {
55df6700
FC		 832 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
833 flags &~GV_SUPER);
e1a479c5
BB		 834 if(candidate) {
835 cand_cv = GvCV(candidate);
836 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 837 CV *old_cv = GvCV(topgv);
838 SvREFCNT_dec(old_cv);
e1a479c5 839 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 840 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 841 GvCVGEN(topgv) = topgen_cmp;
842 }
843 return candidate;
844 }
845 }
846
847 if (topgv && GvREFCNT(topgv) == 1) {
848 /* cache the fact that the method is not defined */
849 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 850 }
851
79072805
LW		 852 return 0;
853}
854
c6afe666 855GV *
856Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
857{
858 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
859 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
860}
861
954c1994 862/*
460e5730
FC		 863=for apidoc gv_fetchmeth_autoload
864
865This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
866parameter.
867
d21989ed 868=for apidoc gv_fetchmeth_sv_autoload
611c1e95 869
d21989ed
BF		 870Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
871of an SV instead of a string/length pair.
872
873=cut
874*/
875
876GV *
877Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
878{
879 char *namepv;
880 STRLEN namelen;
881 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
882 namepv = SvPV(namesv, namelen);
883 if (SvUTF8(namesv))
884 flags |= SVf_UTF8;
885 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
886}
887
888/*
889=for apidoc gv_fetchmeth_pv_autoload
890
891Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
892instead of a string/length pair.
893
894=cut
895*/
896
897GV *
898Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
899{
900 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
901 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
902}
903
904/*
905=for apidoc gv_fetchmeth_pvn_autoload
906
796b6530 907Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ		 908Returns a glob for the subroutine.
909
910For an autoloaded subroutine without a GV, will create a GV even
796b6530 911if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ		 912of the result may be zero.
913
796b6530 914Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 915
611c1e95
IZ		 916=cut
917*/
918
919GV *
d21989ed 920Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 921{
499321d3 922 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 923
d21989ed 924 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 925
611c1e95 926 if (!gv) {
611c1e95
IZ		 927 CV *cv;
928 GV **gvp;
929
930 if (!stash)
6136c704 931 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 932 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 933 return NULL;
d21989ed 934 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 935 return NULL;
611c1e95
IZ		 936 cv = GvCV(gv);
937 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 938 return NULL;
611c1e95
IZ		 939 /* Have an autoload */
940 if (level < 0) /* Cannot do without a stub */
d21989ed 941 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 942 gvp = (GV**)hv_fetch(stash, name,
943 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 944 if (!gvp)
6136c704 945 return NULL;
611c1e95
IZ		 946 return *gvp;
947 }
948 return gv;
949}
950
951/*
954c1994
GS		 952=for apidoc gv_fetchmethod_autoload
953
954Returns the glob which contains the subroutine to call to invoke the method
955on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 956glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 957already setup.
954c1994
GS		 958
959The third parameter of C<gv_fetchmethod_autoload> determines whether
960AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 961means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 962Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 963with a non-zero C<autoload> parameter.
954c1994 964
cec2d7b1
FC		 965These functions grant C<"SUPER"> token
966as a prefix of the method name. Note
954c1994
GS		 967that if you want to keep the returned glob for a long time, you need to
968check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 969different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 970created as a side effect to do this.
954c1994 971
cec2d7b1
FC		 972These functions have the same side-effects as C<gv_fetchmeth> with
973C<level==0>. The warning against passing the GV returned by
974C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 975
976=cut
977*/
978
dc848c6f 979GV *
864dbfa3 980Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 981{
547bb267
NC		 982 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
983
256d1bb2
NC		 984 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
985}
986
44130a26
BF		 987GV *
988Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
989{
990 char *namepv;
991 STRLEN namelen;
992 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
993 namepv = SvPV(namesv, namelen);
994 if (SvUTF8(namesv))
995 flags |= SVf_UTF8;
996 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
997}
998
999GV *
1000Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1001{
1002 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1003 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1004}
1005
256d1bb2
NC		 1006/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1007 even a U32 hash */
1008GV *
44130a26 1009Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1010{
65308f87
YO		 1011 const char * const origname = name;
1012 const char * const name_end = name + len;
e2cace1e 1013 const char *last_separator = NULL;
a0d0e21e 1014 GV* gv;
0dae17bd 1015 HV* ostash = stash;
ad64d0ec 1016 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1017 const U32 autoload = flags & GV_AUTOLOAD;
1018 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1019 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1020
44130a26 1021 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1022
eff494dd 1023 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1024 stash = NULL;
c9bf4021 1025 else {
e2cace1e 1026 /* The only way stash can become NULL later on is if last_separator is set,
c9bf4021
NC		 1027 which in turn means that there is no need for a SVt_PVHV case
1028 the error reporting code. */
1029 }
b267980d 1030
cfb73676
YO		 1031 {
1032 /* check if the method name is fully qualified or
1033 * not, and separate the package name from the actual
1034 * method name.
1035 *
1036 * leaves last_separator pointing to the beginning of the
1037 * last package separator (either ' or ::) or 0
1038 * if none was found.
1039 *
1040 * leaves name pointing at the beginning of the
1041 * method name.
1042 */
1043 const char *name_cursor = name;
1044 const char * const name_em1 = name_end - 1; /* name_end minus 1 */
1045 for (name_cursor = name; name_cursor < name_end ; name_cursor++) {
1046 if (*name_cursor == '\'') {
1047 last_separator = name_cursor;
1048 name = name_cursor + 1;
1049 }
1050 else if (name_cursor < name_em1 && *name_cursor == ':' && name_cursor[1] == ':') {
1051 last_separator = name_cursor++;
1052 name = name_cursor + 1;
1053 }
1054 }
a0d0e21e 1055 }
cfb73676
YO		 1056
1057 /* did we find a separator? */
e2cace1e 1058 if (last_separator) {
9b7f107c
YO		 1059 STRLEN sep_len= last_separator - origname;
1060 if ( memEQs(origname, sep_len, "SUPER")) {
9607fc9c 1061 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1062 stash = CopSTASH(PL_curcop);
1063 flags |= GV_SUPER;
cea2e8a9 1064 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1065 origname, HvENAME_get(stash), name) );
4633a7c4 1066 }
9b7f107c
YO		 1067 else if ( sep_len >= 7 &&
1068 strEQs(last_separator - 7, "::SUPER")) {
aae43805 1069 /* don't autovifify if ->NoSuchStash::SUPER::method */
9b7f107c 1070 stash = gv_stashpvn(origname, sep_len - 7, is_utf8);
aae43805
FC		 1071 if (stash) flags |= GV_SUPER;
1072 }
e189a56d 1073 else {
af09ea45 1074 /* don't autovifify if ->NoSuchStash::method */
9b7f107c 1075 stash = gv_stashpvn(origname, sep_len, is_utf8);
e189a56d 1076 }
0dae17bd 1077 ostash = stash;
4633a7c4
LW		 1078 }
1079
65308f87 1080 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
a0d0e21e 1081 if (!gv) {
7da9d78d
AB		 1082 /* This is the special case that exempts Foo->import and
1083 Foo->unimport from being an error even if there's no
1084 import/unimport subroutine */
2f6e0fe7 1085 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1086 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1087 else if (autoload)
c8416c26 1088 gv = gv_autoload_pvn(
65308f87 1089 ostash, name, name_end - name, GV_AUTOLOAD_ISMETHOD|flags
c8416c26 1090 );
256d1bb2
NC		 1091 if (!gv && do_croak) {
1092 /* Right now this is exclusively for the benefit of S_method_common
1093 in pp_hot.c */
1094 if (stash) {
15e6cdd9
DG		 1095 /* If we can't find an IO::File method, it might be a call on
1096 * a filehandle. If IO:File has not been loaded, try to
1097 * require it first instead of croaking */
1098 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1099 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1100 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1101 STR_WITH_LEN("IO/File.pm"), 0,
1102 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1103 ) {
31b05a0f 1104 require_pv("IO/File.pm");
65308f87 1105 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
15e6cdd9
DG		 1106 if (gv)
1107 return gv;
1108 }
256d1bb2 1109 Perl_croak(aTHX_
b17a0679 1110 "Can't locate object method \"%"UTF8f
d0c0e7dd 1111 "\" via package \"%"HEKf"\"",
65308f87 1112 UTF8fARG(is_utf8, name_end - name, name),
d0c0e7dd 1113 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1114 }
1115 else {
ecad31f0 1116 SV* packnamesv;
256d1bb2 1117
e2cace1e
YO		 1118 if (last_separator) {
1119 packnamesv = newSVpvn_flags(origname, last_separator - origname,
ecad31f0 1120 SVs_TEMP | is_utf8);
256d1bb2 1121 } else {
017c5e4e 1122 packnamesv = error_report;
256d1bb2
NC		 1123 }
1124
1125 Perl_croak(aTHX_
b17a0679
FC		 1126 "Can't locate object method \"%"UTF8f
1127 "\" via package \"%"SVf"\""
ecad31f0 1128 " (perhaps you forgot to load \"%"SVf"\"?)",
65308f87 1129 UTF8fARG(is_utf8, name_end - name, name),
ecad31f0 1130 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1131 }
1132 }
463ee0b2 1133 }
dc848c6f 1134 else if (autoload) {
9d4ba2ae 1135 CV* const cv = GvCV(gv);
09280a33
CS		 1136 if (!CvROOT(cv) && !CvXSUB(cv)) {
1137 GV* stubgv;
1138 GV* autogv;
1139
0c028dca 1140 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1141 stubgv = gv;
1142 else {
1143 stubgv = CvGV(cv);
1144 if (GvCV(stubgv) != cv) /* orphaned import */
1145 stubgv = gv;
1146 }
c8416c26
BF		 1147 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1148 GvNAME(stubgv), GvNAMELEN(stubgv),
1149 GV_AUTOLOAD_ISMETHOD
1150 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1151 if (autogv)
1152 gv = autogv;
1153 }
1154 }
44a8e56a 1155
1156 return gv;
1157}
1158
1159GV*
0eeb01b9 1160Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1161{
1162 char *namepv;
1163 STRLEN namelen;
0fe84f7c 1164 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1165 namepv = SvPV(namesv, namelen);
1166 if (SvUTF8(namesv))
1167 flags |= SVf_UTF8;
0eeb01b9 1168 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1169}
1170
1171GV*
0eeb01b9 1172Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1173{
0fe84f7c 1174 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1175 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1176}
1177
1178GV*
0eeb01b9 1179Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1180{
44a8e56a 1181 GV* gv;
1182 CV* cv;
1183 HV* varstash;
1184 GV* vargv;
1185 SV* varsv;
c8416c26
BF		 1186 SV *packname = NULL;
1187 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1188
0fe84f7c 1189 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1190
7edbdc6b 1191 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1192 return NULL;
0dae17bd
GS		 1193 if (stash) {
1194 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1195 STRLEN packname_len = 0;
1196 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1197 packname = newSVpvn_flags(packname_ptr, packname_len,
1198 SVs_TEMP | SvUTF8(stash));
5c284bb0 1199 stash = NULL;
0dae17bd 1200 }
c8416c26
BF		 1201 else
1202 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1203 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1204 }
257dc59d
FC		 1205 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1206 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1207 return NULL;
dc848c6f 1208 cv = GvCV(gv);
1209
adb5a9ae 1210 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1211 return NULL;
ed850460 1212
dc848c6f 1213 /*
1214 * Inheriting AUTOLOAD for non-methods works ... for now.
1215 */
0eeb01b9
FC		 1216 if (
1217 !(flags & GV_AUTOLOAD_ISMETHOD)
1218 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1219 )
d1d15184 1220 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1221 "Use of inherited AUTOLOAD for non-method %"SVf
1222 "::%"UTF8f"() is deprecated",
ecad31f0 1223 SVfARG(packname),
b17a0679 1224 UTF8fARG(is_utf8, len, name));
44a8e56a 1225
aed2304a 1226 if (CvISXSUB(cv)) {
bb619f37
FC		 1227 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1228 * and split that value on the last '::', pass along the same data
1229 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1230 *
1231 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1232 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1233 * type. Since SvPVX has been documented as returning the sub name
1234 * for a long time, but not as returning the prototype, we have
1235 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1236 * elsewhere.
1237 *
1238 * We put the prototype in the same allocated buffer, but after
1239 * the sub name. The SvPOK flag indicates the presence of a proto-
1240 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1241 * If both flags are on, then SvLEN is used to indicate the end of
1242 * the prototype (artificially lower than what is actually allo-
1243 * cated), at the risk of having to reallocate a few bytes unneces-
1244 * sarily--but that should happen very rarely, if ever.
1245 *
1246 * We use SvUTF8 for both prototypes and sub names, so if one is
1247 * UTF8, the other must be upgraded.
adb5a9ae 1248 */
c68d9564 1249 CvSTASH_set(cv, stash);
8fa6a409 1250 if (SvPOK(cv)) { /* Ouch! */
e7881358 1251 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1252 STRLEN ulen;
1253 const char *proto = CvPROTO(cv);
1254 assert(proto);
1255 if (SvUTF8(cv))
1256 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1257 ulen = SvCUR(tmpsv);
1258 SvCUR(tmpsv)++; /* include null in string */
1259 sv_catpvn_flags(
1260 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1261 );
1262 SvTEMP_on(tmpsv); /* Allow theft */
1263 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1264 SvTEMP_off(tmpsv);
e7881358 1265 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1266 SvLEN(cv) = SvCUR(cv) + 1;
1267 SvCUR(cv) = ulen;
1268 }
1269 else {
1270 sv_setpvn((SV *)cv, name, len);
1271 SvPOK_off(cv);
1272 if (is_utf8)
c8416c26 1273 SvUTF8_on(cv);
8fa6a409
FC		 1274 else SvUTF8_off(cv);
1275 }
1276 CvAUTOLOAD_on(cv);
adb5a9ae 1277 }
adb5a9ae 1278
44a8e56a 1279 /*
1280 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1281 * The subroutine's original name may not be "AUTOLOAD", so we don't
1282 * use that, but for lack of anything better we will use the sub's
1283 * original package to look up $AUTOLOAD.
1284 */
18691622 1285 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1286 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1287 ENTER;
1288
c69033f2 1289 if (!isGV(vargv)) {
04ec7e59 1290 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1291#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1292 GvSV(vargv) = newSV(0);
c69033f2
NC		 1293#endif
1294 }
3d35f11b 1295 LEAVE;
e203899d 1296 varsv = GvSVn(vargv);
4bac9ae4
CS		 1297 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1298 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1299 sv_setsv(varsv, packname);
396482e1 1300 sv_catpvs(varsv, "::");
d40bf27b
NC		 1301 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1302 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1303 sv_catpvn_flags(
1304 varsv, name, len,
5bcd1ef4 1305 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1306 );
c8416c26
BF		 1307 if (is_utf8)
1308 SvUTF8_on(varsv);
a0d0e21e
LW		 1309 return gv;
1310}
1311
44a2ac75
YO		 1312
1313/* require_tie_mod() internal routine for requiring a module
486ec47a 1314 * that implements the logic of automatic ties like %! and %-
e94ea821
FC		 1315 * It loads the module and then calls the _tie_it subroutine
1316 * with the passed gv as an argument.
44a2ac75
YO		 1317 *
1318 * The "gv" parameter should be the glob.
ee33cc1a 1319 * "varname" holds the 1-char name of the var, used for error messages.
45cbc99a 1320 * "namesv" holds the module name. Its refcount will be decremented.
45cbc99a 1321 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1322 * For the protection of $! to work (it is set by this routine)
1323 * the sv slot must already be magicalized.
d2c93421 1324 */
e94ea821 1325STATIC void
ee33cc1a 1326S_require_tie_mod(pTHX_ GV *gv, const char varname, const char * name,
a1683482 1327 STRLEN len, const U32 flags)
d2c93421 1328{
e94ea821 1329 const SV * const target = varname == '[' ? GvSV(gv) : (SV *)GvHV(gv);
45cbc99a 1330
7918f24d
NC		 1331 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1332
e94ea821
FC		 1333 /* If it is not tied */
1334 if (!target || !SvRMAGICAL(target)
1335 || !mg_find(target,
1336 varname == '[' ? PERL_MAGIC_tiedscalar : PERL_MAGIC_tied))
1337 {
1338 HV *stash;
1339 GV **gvp;
1340 dSP;
1341
1342 ENTER;
e94ea821 1343
4c4f3c46 1344#define HV_FETCH_TIE_FUNC (GV **)hv_fetchs(stash, "_tie_it", 0)
e94ea821
FC		 1345
1346 /* Load the module if it is not loaded. */
360cebfd 1347 if (!(stash = gv_stashpvn(name, len, 0))
e94ea821
FC		 1348 || !(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
1349 {
360cebfd 1350 SV * const module = newSVpvn(name, len);
b82b06b8 1351 const char type = varname == '[' ? '$' : '%';
44a2ac75 1352 if ( flags & 1 )
45cbc99a 1353 save_scalar(gv);
5b2ef88e 1354 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1355 assert(sp == PL_stack_sp);
360cebfd 1356 stash = gv_stashpvn(name, len, 0);
44a2ac75 1357 if (!stash)
360cebfd
FC		 1358 Perl_croak(aTHX_ "panic: Can't use %c%c because %s is not available",
1359 type, varname, name);
e94ea821 1360 else if (!(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
360cebfd
FC		 1361 Perl_croak(aTHX_ "panic: Can't use %c%c because %s does not define _tie_it",
1362 type, varname, name);
e94ea821
FC		 1363 }
1364 /* Now call the tie function. It should be in *gvp. */
1365 assert(gvp); assert(*gvp); assert(GvCV(*gvp));
1366 PUSHMARK(SP);
1367 XPUSHs((SV *)gv);
1368 PUTBACK;
1369 call_sv((SV *)*gvp, G_VOID|G_DISCARD);
1370 LEAVE;
d2c93421
RH		 1371 }
1372}
1373
7c719134
YO		 1374/* add a require_tie_mod_s - the _s suffix is similar to pvs type suffixes,
1375 * IOW it means we do STR_WITH_LEN() ourselves and the user should pass in
1376 * a true string WITHOUT a len.
1377 */
1378#define require_tie_mod_s(gv, varname, name, flags) \
1379 S_require_tie_mod(aTHX_ gv, varname, STR_WITH_LEN(name), flags)
1380
954c1994
GS		 1381/*
1382=for apidoc gv_stashpv
1383
da51bb9b 1384Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1385determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1386
1387=cut
1388*/
1389
a0d0e21e 1390HV*
864dbfa3 1391Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1392{
7918f24d 1393 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1394 return gv_stashpvn(name, strlen(name), create);
1395}
1396
bc96cb06
SH		 1397/*
1398=for apidoc gv_stashpvn
1399
da51bb9b
NC		 1400Returns a pointer to the stash for a specified package. The C<namelen>
1401parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1402to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1403created if it does not already exist. If the package does not exist and
796b6530 1404C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC		 1405is returned.
1406
566a4718
YO		 1407Flags may be one of:
1408
1409 GV_ADD
1410 SVf_UTF8
1411 GV_NOADD_NOINIT
1412 GV_NOINIT
1413 GV_NOEXPAND
1414 GV_ADDMG
1415
796b6530 1416The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1417
808724c8 1418Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1419recommended for performance reasons.
1420
bc96cb06
SH		 1421=cut
1422*/
1423
0eadbdad
YO		 1424/*
1425gv_stashpvn_internal
1426
1427Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1428as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1429
1430*/
1431
4e7ebec5 1432PERL_STATIC_INLINE HV*
0eadbdad 1433S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1434{
0cea0058 1435 char smallbuf[128];
46fc3d4c 1436 char *tmpbuf;
a0d0e21e
LW		 1437 HV *stash;
1438 GV *tmpgv;
add0ecde 1439 U32 tmplen = namelen + 2;
dc437b57 1440
0eadbdad 1441 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1442
add0ecde 1443 if (tmplen <= sizeof smallbuf)
46fc3d4c 1444 tmpbuf = smallbuf;
1445 else
add0ecde
VP		 1446 Newx(tmpbuf, tmplen, char);
1447 Copy(name, tmpbuf, namelen, char);
1448 tmpbuf[namelen] = ':';
1449 tmpbuf[namelen+1] = ':';
1450 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1451 if (tmpbuf != smallbuf)
1452 Safefree(tmpbuf);
d2fcb1d6 1453 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1454 return NULL;
a0d0e21e 1455 stash = GvHV(tmpgv);
1f656fcf 1456 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1457 assert(stash);
1f656fcf 1458 if (!HvNAME_get(stash)) {
0be4d16f 1459 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1460
1461 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1462 /* If the containing stash has multiple effective
1463 names, see that this one gets them, too. */
1464 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1465 mro_package_moved(stash, NULL, tmpgv, 1);
1466 }
a0d0e21e 1467 return stash;
463ee0b2
LW		 1468}
1469
808724c8 1470/*
1471gv_stashsvpvn_cached
1472
1473Returns a pointer to the stash for a specified package, possibly
48a81373 1474cached. Implements both C<gv_stashpvn> and C<gv_stashsv>.
808724c8 1475
1476Requires one of either namesv or namepv to be non-null.
1477
fbe13c60 1478See C<L</gv_stashpvn>> for details on "flags".
808724c8 1479
1480Note the sv interface is strongly preferred for performance reasons.
1481
1482*/
1483
1484#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1485 assert(namesv || name)
1486
1487PERL_STATIC_INLINE HV*
1488S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1489{
1490 HV* stash;
808724c8 1491 HE* he;
1492
1493 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1494
1495 he = (HE *)hv_common(
1496 PL_stashcache, namesv, name, namelen,
4e7ebec5 1497 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1498 );
808724c8 1499
4e7ebec5 1500 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1501 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1502
808724c8 1503 if (namesv) {
1504 if (SvOK(namesv)) { /* prevent double uninit warning */
1505 STRLEN len;
1506 name = SvPV_const(namesv, len);
1507 namelen = len;
1508 flags |= SvUTF8(namesv);
1509 } else {
1510 name = ""; namelen = 0;
1511 }
1512 }
0eadbdad
YO		 1513 stash = gv_stashpvn_internal(name, namelen, flags);
1514
4e7ebec5 1515 if (stash && namelen) {
1516 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1517 (void)hv_store(PL_stashcache, name,
4e7ebec5 1518 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1519 }
808724c8 1520
4e7ebec5 1521 return stash;
1522}
1523
808724c8 1524HV*
1525Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1526{
1527 PERL_ARGS_ASSERT_GV_STASHPVN;
1528 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1529}
1530
954c1994
GS		 1531/*
1532=for apidoc gv_stashsv
1533
fbe13c60
KW		 1534Returns a pointer to the stash for a specified package. See
1535C<L</gv_stashpvn>>.
954c1994 1536
fbe13c60
KW		 1537Note this interface is strongly preferred over C<gv_stashpvn> for performance
1538reasons.
808724c8 1539
954c1994
GS		 1540=cut
1541*/
1542
a0d0e21e 1543HV*
da51bb9b 1544Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1545{
7918f24d 1546 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1547 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1548}
1549
1550
463ee0b2 1551GV *
fe9845cc 1552Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1553 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1554 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1555}
1556
1557GV *
fe9845cc 1558Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1559 STRLEN len;
77cb3b01
FC		 1560 const char * const nambeg =
1561 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1562 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1563 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1564}
1565
90aeefb4 1566PERL_STATIC_INLINE void
290a1700 1567S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1568{
1569 AV* av;
1570
1571 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1572
1573 av = GvAVn(gv);
1574 GvMULTI_on(gv);
1575 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1576 NULL, 0);
ad7cce9f
FR		 1577}
1578
90aeefb4
BF		 1579/* This function grabs name and tries to split a stash and glob
1580 * from its contents. TODO better description, comments
1581 *
1582 * If the function returns TRUE and 'name == name_end', then
1583 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1584 */
1585PERL_STATIC_INLINE bool
1586S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1587 STRLEN *len, const char *nambeg, STRLEN full_len,
1588 const U32 is_utf8, const I32 add)
1589{
1590 const char *name_cursor;
1591 const char *const name_end = nambeg + full_len;
1592 const char *const name_em1 = name_end - 1;
1593
1594 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1595
1596 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1597 /* accidental stringify on a GV? */
1598 (*name)++;
1599 }
1600
1601 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1602 if (name_cursor < name_em1 &&
1603 ((*name_cursor == ':' && name_cursor[1] == ':')
1604 || *name_cursor == '\''))
1605 {
1606 if (!*stash)
1607 *stash = PL_defstash;
1608 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1609 return FALSE;
1610
1611 *len = name_cursor - *name;
1612 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1613 const char *key;
1614 GV**gvp;
1615 if (*name_cursor == ':') {
1616 key = *name;
1617 *len += 2;
1618 }
1619 else {
1620 char *tmpbuf;
1621 Newx(tmpbuf, *len+2, char);
1622 Copy(*name, tmpbuf, *len, char);
1623 tmpbuf[(*len)++] = ':';
1624 tmpbuf[(*len)++] = ':';
1625 key = tmpbuf;
1626 }
c161da64 1627 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1628 *gv = gvp ? *gvp : NULL;
1629 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1630 if (SvTYPE(*gv) != SVt_PVGV)
1631 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1632 else
1633 GvMULTI_on(*gv);
1634 }
1635 if (key != *name)
1636 Safefree(key);
1637 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1638 return FALSE;
1639
1640 if (!(*stash = GvHV(*gv))) {
1641 *stash = GvHV(*gv) = newHV();
1642 if (!HvNAME_get(*stash)) {
1643 if (GvSTASH(*gv) == PL_defstash && *len == 6
4c4f3c46
YO		 1644 && strEQs(*name, "CORE"))
1645 hv_name_sets(*stash, "CORE", 0);
90aeefb4
BF		 1646 else
1647 hv_name_set(
1648 *stash, nambeg, name_cursor-nambeg, is_utf8
1649 );
1650 /* If the containing stash has multiple effective
1651 names, see that this one gets them, too. */
1652 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1653 mro_package_moved(*stash, NULL, *gv, 1);
1654 }
1655 }
1656 else if (!HvNAME_get(*stash))
1657 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1658 }
1659
1660 if (*name_cursor == ':')
1661 name_cursor++;
1662 *name = name_cursor+1;
1663 if (*name == name_end) {
1664 if (!*gv)
1665 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1666 return TRUE;
1667 }
1668 }
1669 }
1670 *len = name_cursor - *name;
1671 return TRUE;
1672}
1673
536d1a88 1674/* Checks if an unqualified name is in the main stash */
90aeefb4 1675PERL_STATIC_INLINE bool
536d1a88 1676S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1677{
536d1a88 1678 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1679
90aeefb4 1680 /* If it's an alphanumeric variable */
536d1a88 1681 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1682 /* Some "normal" variables are always in main::,
1683 * like INC or STDOUT.
1684 */
1685 switch (len) {
1686 case 1:
1687 if (*name == '_')
536d1a88 1688 return TRUE;
90aeefb4
BF		 1689 break;
1690 case 3:
1691 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1692 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1693 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1694 return TRUE;
90aeefb4
BF		 1695 break;
1696 case 4:
1697 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1698 && name[3] == 'V')
536d1a88 1699 return TRUE;
90aeefb4
BF		 1700 break;
1701 case 5:
1702 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1703 && name[3] == 'I' && name[4] == 'N')
536d1a88 1704 return TRUE;
90aeefb4
BF		 1705 break;
1706 case 6:
1707 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1708 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1709 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1710 return TRUE;
90aeefb4
BF		 1711 break;
1712 case 7:
1713 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1714 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1715 && name[6] == 'T')
536d1a88 1716 return TRUE;
90aeefb4
BF		 1717 break;
1718 }
536d1a88
BF		 1719 }
1720 /* *{""}, or a special variable like $@ */
1721 else
1722 return TRUE;
1723
1724 return FALSE;
1725}
1726
1727
1728/* This function is called if parse_gv_stash_name() failed to
1729 * find a stash, or if GV_NOTQUAL or an empty name was passed
1730 * to gv_fetchpvn_flags.
1731 *
1732 * It returns FALSE if the default stash can't be found nor created,
1733 * which might happen during global destruction.
1734 */
1735PERL_STATIC_INLINE bool
1736S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1737 const U32 is_utf8, const I32 add,
1738 const svtype sv_type)
1739{
1740 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1741
1742 /* No stash in name, so see how we can default */
90aeefb4 1743
536d1a88
BF		 1744 if ( gv_is_in_main(name, len, is_utf8) ) {
1745 *stash = PL_defstash;
1746 }
1747 else {
1748 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1749 *stash = PL_curstash;
1750 if (add && (PL_hints & HINT_STRICT_VARS) &&
1751 sv_type != SVt_PVCV &&
1752 sv_type != SVt_PVGV &&
1753 sv_type != SVt_PVFM &&
1754 sv_type != SVt_PVIO &&
1755 !(len == 1 && sv_type == SVt_PV &&
1756 (*name == 'a' || *name == 'b')) )
1757 {
c161da64 1758 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1759 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1760 SvTYPE(*gvp) != SVt_PVGV)
1761 {
1762 *stash = NULL;
1763 }
1764 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1765 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1766 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1767 {
1768 /* diag_listed_as: Variable "%s" is not imported%s */
1769 Perl_ck_warner_d(
1770 aTHX_ packWARN(WARN_MISC),
1771 "Variable \"%c%"UTF8f"\" is not imported",
1772 sv_type == SVt_PVAV ? '@' :
1773 sv_type == SVt_PVHV ? '%' : '$',
1774 UTF8fARG(is_utf8, len, name));
1775 if (GvCVu(*gvp))
1776 Perl_ck_warner_d(
1777 aTHX_ packWARN(WARN_MISC),
1778 "\t(Did you mean &%"UTF8f" instead?)\n",
1779 UTF8fARG(is_utf8, len, name)
1780 );
1781 *stash = NULL;
1782 }
1783 }
1784 }
1785 else {
1786 /* Use the current op's stash */
1787 *stash = CopSTASH(PL_curcop);
1788 }
1789 }
90aeefb4
BF		 1790
1791 if (!*stash) {
1792 if (add && !PL_in_clean_all) {
10860bf4
FC		 1793 GV *gv;
1794 qerror(Perl_mess(aTHX_
90aeefb4 1795 "Global symbol \"%s%"UTF8f
d8c6310a
FC		 1796 "\" requires explicit package name (did you forget to "
1797 "declare \"my %s%"UTF8f"\"?)",
1798 (sv_type == SVt_PV ? "$"
1799 : sv_type == SVt_PVAV ? "@"
1800 : sv_type == SVt_PVHV ? "%"
1801 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1802 (sv_type == SVt_PV ? "$"
1803 : sv_type == SVt_PVAV ? "@"
1804 : sv_type == SVt_PVHV ? "%"
10860bf4 1805 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1806 /* To maintain the output of errors after the strict exception
1807 * above, and to keep compat with older releases, rather than
1808 * placing the variables in the pad, we place
1809 * them in the <none>:: stash.
1810 */
90aeefb4
BF		 1811 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1812 if (!gv) {
1813 /* symbol table under destruction */
1814 return FALSE;
1815 }
1816 *stash = GvHV(gv);
1817 }
1818 else
1819 return FALSE;
1820 }
1821
1822 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1823 return FALSE;
1824
1825 return TRUE;
1826}
1827
8c995aba
FC		 1828/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1829 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1830 this file. */
1831#undef SvREADONLY_on
1832#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1833
930867a8
BF		 1834/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1835 * a new GV.
1836 * Note that it does not insert the GV into the stash prior to
1837 * magicalization, which some variables require need in order
1838 * to work (like $[, %+, %-, %!), so callers must take care of
1321bbe3 1839 * that.
930867a8 1840 *
1321bbe3
FC		 1841 * It returns true if the gv did turn out to be magical one; i.e.,
1842 * if gv_magicalize actually did something.
930867a8
BF		 1843 */
1844PERL_STATIC_INLINE bool
1845S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1321bbe3 1846 const svtype sv_type)
79072805 1847{
960b831f 1848 SSize_t paren;
79072805 1849
930867a8 1850 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1851
44428a46 1852 if (stash != PL_defstash) { /* not the main stash */
ea238638 1853 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1854 and VERSION. All the others apply only to the main stash or to
1855 CORE (which is checked right after this). */
ea238638 1856 if (len) {
cc4c2da6 1857 switch (*name) {
cc4c2da6 1858 case 'E':
eafd371c
YO		 1859 if (memEQs(name, len, "EXPORT")
1860 ||memEQs(name, len, "EXPORT_OK")
1861 ||memEQs(name, len, "EXPORT_FAIL")
1862 )
cc4c2da6
NC		 1863 GvMULTI_on(gv);
1864 break;
1865 case 'I':
eafd371c 1866 if (memEQs(name, len, "ISA"))
290a1700 1867 gv_magicalize_isa(gv);
cc4c2da6 1868 break;
44428a46 1869 case 'V':
eafd371c 1870 if (memEQs(name, len, "VERSION"))
44428a46
FC		 1871 GvMULTI_on(gv);
1872 break;
ea238638 1873 case 'a':
eafd371c 1874 if (stash == PL_debstash && memEQs(name, len, "args")) {
7bb33634
FC		 1875 GvMULTI_on(gv_AVadd(gv));
1876 break;
eafd371c
YO		 1877 }
1878 /* FALLTHROUGH */
ea238638
FC		 1879 case 'b':
1880 if (len == 1 && sv_type == SVt_PV)
1881 GvMULTI_on(gv);
924ba076 1882 /* FALLTHROUGH */
4aaa4757
FC		 1883 default:
1884 goto try_core;
1885 }
1321bbe3 1886 goto ret;
4aaa4757
FC		 1887 }
1888 try_core:
1889 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1890 /* Avoid null warning: */
1891 const char * const stashname = HvNAME(stash); assert(stashname);
4c4f3c46 1892 if (strEQs(stashname, "CORE"))
87566176 1893 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1894 }
1895 }
1896 else if (len > 1) {
1897#ifndef EBCDIC
1898 if (*name > 'V' ) {
1899 NOOP;
1900 /* Nothing else to do.
1901 The compiler will probably turn the switch statement into a
1902 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1903 the common case of lower case variable names. (On EBCDIC
1904 platforms, we can't just do:
1905 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1906 because cases like '\027' in the switch statement below are
1907 C1 (non-ASCII) controls on those platforms, so the remapping
1908 would make them larger than 'V')
1909 */
44428a46
FC		 1910 } else
1911#endif
1912 {
44428a46
FC		 1913 switch (*name) {
1914 case 'A':
eafd371c 1915 if (memEQs(name, len, "ARGV")) {
44428a46
FC		 1916 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1917 }
eafd371c 1918 else if (memEQs(name, len, "ARGVOUT")) {
44428a46
FC		 1919 GvMULTI_on(gv);
1920 }
1921 break;
1922 case 'E':
eafd371c 1923 if (memEQs(name, len, "EXPORT"))
44428a46
FC		 1924 GvMULTI_on(gv);
1925 break;
1926 case 'I':
eafd371c 1927 if (memEQs(name, len, "ISA")) {
290a1700 1928 gv_magicalize_isa(gv);
44428a46
FC		 1929 }
1930 break;
cc4c2da6 1931 case 'S':
eafd371c 1932 if (memEQs(name, len, "SIG")) {
cc4c2da6
NC		 1933 HV *hv;
1934 I32 i;
d525a7b2
NC		 1935 if (!PL_psig_name) {
1936 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1937 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1938 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1939 } else {
1940 /* I think that the only way to get here is to re-use an
1941 embedded perl interpreter, where the previous
1942 use didn't clean up fully because
1943 PL_perl_destruct_level was 0. I'm not sure that we
1944 "support" that, in that I suspect in that scenario
1945 there are sufficient other garbage values left in the
1946 interpreter structure that something else will crash
1947 before we get here. I suspect that this is one of
1948 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1949 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1950 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1951 }
1952 GvMULTI_on(gv);
1953 hv = GvHVn(gv);
a0714e2c 1954 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1955 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1956 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1957 if (init)
1958 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1959 }
1960 }
1961 break;
1962 case 'V':
eafd371c 1963 if (memEQs(name, len, "VERSION"))
cc4c2da6
NC		 1964 GvMULTI_on(gv);
1965 break;
e5218da5 1966 case '\003': /* $^CHILD_ERROR_NATIVE */
eafd371c 1967 if (memEQs(name, len, "\003HILD_ERROR_NATIVE"))
e5218da5
GA		 1968 goto magicalize;
1969 break;
cc4c2da6 1970 case '\005': /* $^ENCODING */
eafd371c 1971 if (memEQs(name, len, "\005NCODING"))
cc4c2da6
NC		 1972 goto magicalize;
1973 break;
9ebf26ad 1974 case '\007': /* $^GLOBAL_PHASE */
eafd371c 1975 if (memEQs(name, len, "\007LOBAL_PHASE"))
9ebf26ad
FR		 1976 goto ro_magicalize;
1977 break;
8561ea1d 1978 case '\014': /* $^LAST_FH */
eafd371c 1979 if (memEQs(name, len, "\014AST_FH"))
8561ea1d
FC		 1980 goto ro_magicalize;
1981 break;
cde0cee5 1982 case '\015': /* $^MATCH */
eafd371c 1983 if (memEQs(name, len, "\015ATCH")) {
960b831f
NC		 1984 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1985 goto storeparen;
1986 }
66230c86 1987 break;
cc4c2da6 1988 case '\017': /* $^OPEN */
eafd371c 1989 if (memEQs(name, len, "\017PEN"))
cc4c2da6
NC		 1990 goto magicalize;
1991 break;
cde0cee5 1992 case '\020': /* $^PREMATCH $^POSTMATCH */
eafd371c 1993 if (memEQs(name, len, "\020REMATCH")) {
960b831f
NC		 1994 paren = RX_BUFF_IDX_CARET_PREMATCH;
1995 goto storeparen;
1996 }
eafd371c 1997 if (memEQs(name, len, "\020OSTMATCH")) {
960b831f
NC		 1998 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1999 goto storeparen;
2000 }
9ebf26ad 2001 break;
cc4c2da6 2002 case '\024': /* ${^TAINT} */
eafd371c 2003 if (memEQs(name, len, "\024AINT"))
cc4c2da6
NC		 2004 goto ro_magicalize;
2005 break;
7cebcbc0 2006 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
eafd371c 2007 if (memEQs(name, len, "\025NICODE"))
cc4c2da6 2008 goto ro_magicalize;
eafd371c 2009 if (memEQs(name, len, "\025TF8LOCALE"))
7cebcbc0 2010 goto ro_magicalize;
eafd371c 2011 if (memEQs(name, len, "\025TF8CACHE"))
e07ea26a 2012 goto magicalize;
cc4c2da6
NC		 2013 break;
2014 case '\027': /* $^WARNING_BITS */
eafd371c 2015 if (memEQs(name, len, "\027ARNING_BITS"))
cc4c2da6 2016 goto magicalize;
8ca2a5d6 2017#ifdef WIN32
eafd371c 2018 else if (memEQs(name, len, "\027IN32_SLOPPY_STAT"))
8ca2a5d6
DD		 2019 goto magicalize;
2020#endif
cc4c2da6
NC		 2021 break;
2022 case '1':
2023 case '2':
2024 case '3':
2025 case '4':
2026 case '5':
2027 case '6':
2028 case '7':
2029 case '8':
2030 case '9':
85e6fe83 2031 {
2fdbfb4d
AB		 2032 /* Ensures that we have an all-digit variable, ${"1foo"} fails
2033 this test */
22ff3130
HS		 2034 UV uv;
2035 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1321bbe3 2036 goto ret;
22ff3130
HS		 2037 /* XXX why are we using a SSize_t? */
2038 paren = (SSize_t)(I32)uv;
960b831f 2039 goto storeparen;
1d7c1841 2040 }
dc437b57 2041 }
93a17b20 2042 }
392db708
NC		 2043 } else {
2044 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2045 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2046 switch (*name) {
6361f656 2047 case '&': /* $& */
960b831f
NC		 2048 paren = RX_BUFF_IDX_FULLMATCH;
2049 goto sawampersand;
6361f656 2050 case '`': /* $` */
960b831f
NC		 2051 paren = RX_BUFF_IDX_PREMATCH;
2052 goto sawampersand;
6361f656 2053 case '\'': /* $' */
960b831f
NC		 2054 paren = RX_BUFF_IDX_POSTMATCH;
2055 sawampersand:
1a904fc8 2056#ifdef PERL_SAWAMPERSAND
a289ef89 2057 if (!(
cc4c2da6
NC		 2058 sv_type == SVt_PVAV ||
2059 sv_type == SVt_PVHV ||
2060 sv_type == SVt_PVCV ||
2061 sv_type == SVt_PVFM ||
2062 sv_type == SVt_PVIO
d3b97530
DM		 2063 )) { PL_sawampersand |=
2064 (*name == '`')
2065 ? SAWAMPERSAND_LEFT
2066 : (*name == '&')
2067 ? SAWAMPERSAND_MIDDLE
2068 : SAWAMPERSAND_RIGHT;
2069 }
1a904fc8 2070#endif
960b831f 2071 goto storeparen;
e91d8259
NC		 2072 case '1': /* $1 */
2073 case '2': /* $2 */
2074 case '3': /* $3 */
2075 case '4': /* $4 */
2076 case '5': /* $5 */
2077 case '6': /* $6 */
2078 case '7': /* $7 */
2079 case '8': /* $8 */
2080 case '9': /* $9 */
960b831f
NC		 2081 paren = *name - '0';
2082
2083 storeparen:
e91d8259
NC		 2084 /* Flag the capture variables with a NULL mg_ptr
2085 Use mg_len for the array index to lookup. */
960b831f 2086 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2087 break;
cc4c2da6 2088
6361f656 2089 case ':': /* $: */
c69033f2 2090 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2091 goto magicalize;
2092
6361f656 2093 case '?': /* $? */
ff0cee69 2094#ifdef COMPLEX_STATUS
c69033f2 2095 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2096#endif
cc4c2da6 2097 goto magicalize;
ff0cee69 2098
6361f656 2099 case '!': /* $! */
67261566 2100 GvMULTI_on(gv);
44a2ac75 2101 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2102
ad64d0ec 2103 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2104
7c719134 2105 /* magicalization must be done before require_tie_mod_s is called */
67261566 2106 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
7c719134 2107 require_tie_mod_s(gv, '!', "Errno", 1);
d2c93421 2108
6cef1e77 2109 break;
754f85ad
YO		 2110 case '-': /* $-, %-, @- */
2111 case '+': /* $+, %+, @+ */
44a2ac75
YO		 2112 GvMULTI_on(gv); /* no used once warnings here */
2113 {
44a2ac75 2114 AV* const av = GvAVn(gv);
ad64d0ec 2115 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2116
ad64d0ec
NC		 2117 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2118 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2119 if (avc)
44a2ac75 2120 SvREADONLY_on(GvSVn(gv));
44a2ac75 2121 SvREADONLY_on(av);
67261566
YO		 2122
2123 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
7c719134 2124 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture",0);
67261566 2125
80305961 2126 break;
cc4c2da6 2127 }
6361f656
AB		 2128 case '*': /* $* */
2129 case '#': /* $# */
9b387841 2130 if (sv_type == SVt_PV)
4f650b80 2131 /* diag_listed_as: $* is no longer supported */
9b387841 2132 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2133 "$%c is no longer supported", *name);
8ae1fe26 2134 break;
b3ca2e83
NC		 2135 case '\010': /* $^H */
2136 {
2137 HV *const hv = GvHVn(gv);
2138 hv_magic(hv, NULL, PERL_MAGIC_hints);
2139 }
2140 goto magicalize;
b82b06b8 2141 case '[': /* $[ */
7d69d4a6 2142 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2143 && FEATURE_ARYBASE_IS_ENABLED) {
7c719134 2144 require_tie_mod_s(gv,'[',"arybase",0);
b82b06b8 2145 }
7d69d4a6 2146 else goto magicalize;
b82b06b8 2147 break;
cc4c2da6 2148 case '\023': /* $^S */
2fdbfb4d
AB		 2149 ro_magicalize:
2150 SvREADONLY_on(GvSVn(gv));
924ba076 2151 /* FALLTHROUGH */
6361f656 2152 case '0': /* $0 */
6361f656
AB		 2153 case '^': /* $^ */
2154 case '~': /* $~ */
2155 case '=': /* $= */
2156 case '%': /* $% */
2157 case '.': /* $. */
2158 case '(': /* $( */
2159 case ')': /* $) */
2160 case '<': /* $< */
2161 case '>': /* $> */
2162 case '\\': /* $\ */
2163 case '/': /* $/ */
4505a31f 2164 case '|': /* $| */
9cdac2a2 2165 case '$': /* $$ */
cc4c2da6
NC		 2166 case '\001': /* $^A */
2167 case '\003': /* $^C */
2168 case '\004': /* $^D */
2169 case '\005': /* $^E */
2170 case '\006': /* $^F */
cc4c2da6
NC		 2171 case '\011': /* $^I, NOT \t in EBCDIC */
2172 case '\016': /* $^N */
2173 case '\017': /* $^O */
2174 case '\020': /* $^P */
2175 case '\024': /* $^T */
2176 case '\027': /* $^W */
2177 magicalize:
ad64d0ec 2178 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2179 break;
e521374c 2180
cc4c2da6 2181 case '\014': /* $^L */
76f68e9b 2182 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2183 break;
6361f656 2184 case ';': /* $; */
76f68e9b 2185 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2186 break;
6361f656 2187 case ']': /* $] */
cc4c2da6 2188 {
3638bf15 2189 SV * const sv = GvSV(gv);
d7aa5382 2190 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2191 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2192 GvSV(gv) = vnumify(PL_patchlevel);
2193 SvREADONLY_on(GvSV(gv));
2194 SvREFCNT_dec(sv);
93a17b20
LW		 2195 }
2196 break;
cc4c2da6
NC		 2197 case '\026': /* $^V */
2198 {
3638bf15 2199 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2200 GvSV(gv) = new_version(PL_patchlevel);
2201 SvREADONLY_on(GvSV(gv));
2202 SvREFCNT_dec(sv);
16070b82
GS		 2203 }
2204 break;
ea238638
FC		 2205 case 'a':
2206 case 'b':
dc3e91f6 2207 if (sv_type == SVt_PV)
ea238638 2208 GvMULTI_on(gv);
cc4c2da6 2209 }
79072805 2210 }
930867a8 2211
1321bbe3
FC		 2212 ret:
2213 /* Return true if we actually did something. */
2214 return GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv)
2215 || ( GvSV(gv) && (
2216 SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv))
2217 )
2218 );
71c35c05
BF		 2219}
2220
8c995aba
FC		 2221/* If we do ever start using this later on in the file, we need to make
2222 sure we don’t accidentally use the wrong definition. */
2223#undef SvREADONLY_on
2224
070dc475
BF		 2225/* This function is called when the stash already holds the GV of the magic
2226 * variable we're looking for, but we need to check that it has the correct
2227 * kind of magic. For example, if someone first uses $! and then %!, the
2228 * latter would end up here, and we add the Errno tie to the HASH slot of
2229 * the *! glob.
2230 */
2231PERL_STATIC_INLINE void
2232S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2233{
2234 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2235
2236 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2237 if (*name == '!')
7c719134 2238 require_tie_mod_s(gv, '!', "Errno", 1);
070dc475 2239 else if (*name == '-' || *name == '+')
7c719134 2240 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture", 0);
070dc475
BF		 2241 } else if (sv_type == SVt_PV) {
2242 if (*name == '*' || *name == '#') {
2243 /* diag_listed_as: $* is no longer supported */
2244 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2245 WARN_SYNTAX),
2246 "$%c is no longer supported", *name);
2247 }
2248 }
2249 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2250 switch (*name) {
2251 case '[':
7c719134 2252 require_tie_mod_s(gv,'[',"arybase",0);
070dc475
BF		 2253 break;
2254#ifdef PERL_SAWAMPERSAND
2255 case '`':
2256 PL_sawampersand |= SAWAMPERSAND_LEFT;
2257 (void)GvSVn(gv);
2258 break;
2259 case '&':
2260 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2261 (void)GvSVn(gv);
2262 break;
2263 case '\'':
2264 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2265 (void)GvSVn(gv);
2266 break;
2267#endif
2268 }
2269 }
2270}
2271
71c35c05
BF		 2272GV *
2273Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2274 const svtype sv_type)
2275{
71c35c05
BF		 2276 const char *name = nambeg;
2277 GV *gv = NULL;
2278 GV**gvp;
2279 STRLEN len;
2280 HV *stash = NULL;
2281 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2282 const I32 no_expand = flags & GV_NOEXPAND;
2283 const I32 add = flags & ~GV_NOADD_MASK;
2284 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2285 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2286 const char *const name_end = nambeg + full_len;
2287 U32 faking_it;
2288
2289 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2290
2291 /* If we have GV_NOTQUAL, the caller promised that
2292 * there is no stash, so we can skip the check.
2293 * Similarly if full_len is 0, since then we're
2294 * dealing with something like *{""} or ""->foo()
2295 */
2296 if ((flags & GV_NOTQUAL) || !full_len) {
2297 len = full_len;
2298 }
2299 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2300 if (name == name_end) return gv;
2301 }
2302 else {
2303 return NULL;
2304 }
2305
2306 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2307 return NULL;
2308 }
2309
2310 /* By this point we should have a stash and a name */
c161da64 2311 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2312 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2313 if (addmg) gv = (GV *)newSV(0);
2314 else return NULL;
2315 }
2316 else gv = *gvp, addmg = 0;
2317 /* From this point on, addmg means gv has not been inserted in the
2318 symtab yet. */
2319
2320 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2321 /* The GV already exists, so return it, but check if we need to do
2322 * anything else with it before that.
2323 */
71c35c05 2324 if (add) {
c002ae9a
BF		 2325 /* This is the heuristic that handles if a variable triggers the
2326 * 'used only once' warning. If there's already a GV in the stash
2327 * with this name, then we assume that the variable has been used
2328 * before and turn its MULTI flag on.
2329 * It's a heuristic because it can easily be "tricked", like with
2330 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2331 * not warning about $main::foo being used just once
2332 */
71c35c05
BF		 2333 GvMULTI_on(gv);
2334 gv_init_svtype(gv, sv_type);
2335 /* You reach this path once the typeglob has already been created,
2336 either by the same or a different sigil. If this path didn't
2337 exist, then (say) referencing $! first, and %! second would
2338 mean that %! was not handled correctly. */
2339 if (len == 1 && stash == PL_defstash) {
070dc475 2340 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2341 }
2342 else if (len == 3 && sv_type == SVt_PVAV
eafd371c 2343 && strEQs(name, "ISA")
71c35c05
BF		 2344 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2345 gv_magicalize_isa(gv);
2346 }
2347 return gv;
2348 } else if (no_init) {
2349 assert(!addmg);
2350 return gv;
c002ae9a
BF		 2351 }
2352 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2353 * don't expand it to a glob. This is an optimization so that things
2354 * copying constants over, like Exporter, don't have to be rewritten
2355 * to take into account that you can store more than just globs in
2356 * stashes.
2357 */
2358 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2359 assert(!addmg);
2360 return gv;
2361 }
2362
2363 /* Adding a new symbol.
2364 Unless of course there was already something non-GV here, in which case
2365 we want to behave as if there was always a GV here, containing some sort
2366 of subroutine.
2367 Otherwise we run the risk of creating things like GvIO, which can cause
2368 subtle bugs. eg the one that tripped up SQL::Translator */
2369
2370 faking_it = SvOK(gv);
2371
2372 if (add & GV_ADDWARN)
2373 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2374 "Had to create %"UTF8f" unexpectedly",
2375 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2376 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2377
9e5de6ae 2378 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2379 GvMULTI_on(gv) ;
2380
2381 /* set up magic where warranted */
1321bbe3 2382 if ( gv_magicalize(gv, stash, name, len, sv_type) ) {
930867a8 2383 /* See 23496c6 */
1321bbe3
FC		 2384 if (addmg) {
2385 /* gv_magicalize magicalised this gv, so we want it
930867a8 2386 * stored in the symtab.
1321bbe3
FC		 2387 * Effectively the caller is asking, ‘Does this gv exist?’
2388 * And we respond, ‘Er, *now* it does!’
930867a8
BF		 2389 */
2390 (void)hv_store(stash,name,len,(SV *)gv,0);
1321bbe3
FC		 2391 }
2392 }
2393 else if (addmg) {
2394 /* The temporary GV created above */
930867a8
BF		 2395 SvREFCNT_dec_NN(gv);
2396 gv = NULL;
930867a8 2397 }
71c35c05 2398
e6066781 2399 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2400 return gv;
79072805
LW		 2401}
2402
2403void
35a4481c 2404Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2405{
ed60a868 2406 const char *name;
35a4481c 2407 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2408
2409 PERL_ARGS_ASSERT_GV_FULLNAME4;
2410
666ea192 2411 sv_setpv(sv, prefix ? prefix : "");
a0288114 2412
52a6327b 2413 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2414 const STRLEN len = HvNAMELEN(hv);
2415 if (keepmain || strnNE(name, "main", len)) {
2416 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2417 sv_catpvs(sv,"::");
ed60a868 2418 }
43693395 2419 }
ed60a868 2420 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2421 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2422}
2423
2424void
35a4481c 2425Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2426{
099be4f1 2427 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2428
2429 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2430
46c461b5 2431 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2432}
2433
39a65960
DM		 2434
2435/* recursively scan a stash and any nested stashes looking for entries
2436 * that need the "only used once" warning raised
2437 */
2438
79072805 2439void
51da40ed 2440Perl_gv_check(pTHX_ HV *stash)
79072805 2441{
eb578fdb 2442 I32 i;
463ee0b2 2443
7918f24d
NC		 2444 PERL_ARGS_ASSERT_GV_CHECK;
2445
9e5cda6b 2446 if (!SvOOK(stash))
8990e307 2447 return;
90754377 2448
9e5cda6b 2449 assert(HvARRAY(stash));
90754377 2450
a0d0e21e 2451 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2452 const HE *entry;
90754377 2453 /* mark stash is being scanned, to avoid recursing */
339441ef 2454 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2455 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2456 GV *gv;
b7787f18 2457 HV *hv;
e7acdfe9
DM		 2458 STRLEN keylen = HeKLEN(entry);
2459 const char * const key = HeKEY(entry);
2460
2461 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2462 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2463 {
90754377
DM		 2464 if (hv != PL_defstash && hv != stash
2465 && !(SvOOK(hv)
2466 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2467 )
a0d0e21e
LW		 2468 gv_check(hv); /* nested package */
2469 }
ecad31f0
BF		 2470 else if ( *HeKEY(entry) != '_'
2471 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2472 const char *file;
159b6efe 2473 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2474 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2475 continue;
1d7c1841 2476 file = GvFILE(gv);
1d7c1841 2477 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2478#ifdef USE_ITHREADS
2479 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2480#else
2481 CopFILEGV(PL_curcop)
2482 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2483#endif
9014280d 2484 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2485 "Name \"%"HEKf"::%"HEKf
2486 "\" used only once: possible typo",
2487 HEKfARG(HvNAME_HEK(stash)),
2488 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2489 }
79072805 2490 }
339441ef 2491 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2492 }
2493}
2494
2495GV *
9cc50d5b 2496Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2497{
9cc50d5b 2498 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2499 assert(!(flags & ~SVf_UTF8));
7918f24d 2500
b17a0679
FC		 2501 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2502 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2503 (long)PL_gensym++),
2504 GV_ADD, SVt_PVGV);
79072805
LW		 2505}
2506
2507/* hopefully this is only called on local symbol table entries */
2508
2509GP*
864dbfa3 2510Perl_gp_ref(pTHX_ GP *gp)
79072805 2511{
1d7c1841 2512 if (!gp)
d4c19fe8 2513 return NULL;
79072805 2514 gp->gp_refcnt++;
44a8e56a 2515 if (gp->gp_cv) {
2516 if (gp->gp_cvgen) {
e1a479c5
BB		 2517 /* If the GP they asked for a reference to contains
2518 a method cache entry, clear it first, so that we
2519 don't infect them with our cached entry */
e7881358 2520 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2521 gp->gp_cv = NULL;
44a8e56a 2522 gp->gp_cvgen = 0;
2523 }
44a8e56a 2524 }
79072805 2525 return gp;
79072805
LW		 2526}
2527
2528void
864dbfa3 2529Perl_gp_free(pTHX_ GV *gv)
79072805 2530{
79072805 2531 GP* gp;
b0d55c99 2532 int attempts = 100;
79072805 2533
f7877b28 2534 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2535 return;
f248d071 2536 if (gp->gp_refcnt == 0) {
9b387841
NC		 2537 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2538 "Attempt to free unreferenced glob pointers"
2539 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2540 return;
2541 }
4571f4a7 2542 if (gp->gp_refcnt > 1) {
bc81b34d 2543 borrowed:
748a9306
LW		 2544 if (gp->gp_egv == gv)
2545 gp->gp_egv = 0;
4571f4a7 2546 gp->gp_refcnt--;
c43ae56f 2547 GvGP_set(gv, NULL);
79072805 2548 return;
748a9306 2549 }
79072805 2550
b0d55c99
FC		 2551 while (1) {
2552 /* Copy and null out all the glob slots, so destructors do not see
2553 freed SVs. */
2554 HEK * const file_hek = gp->gp_file_hek;
2555 SV * const sv = gp->gp_sv;
2556 AV * const av = gp->gp_av;
2557 HV * const hv = gp->gp_hv;
2558 IO * const io = gp->gp_io;
2559 CV * const cv = gp->gp_cv;
2560 CV * const form = gp->gp_form;
2561
2562 gp->gp_file_hek = NULL;
2563 gp->gp_sv = NULL;
2564 gp->gp_av = NULL;
2565 gp->gp_hv = NULL;
2566 gp->gp_io = NULL;
2567 gp->gp_cv = NULL;
2568 gp->gp_form = NULL;
2569
2570 if (file_hek)
2571 unshare_hek(file_hek);
2572
2573 SvREFCNT_dec(sv);
2574 SvREFCNT_dec(av);
2575 /* FIXME - another reference loop GV -> symtab -> GV ?
2576 Somehow gp->gp_hv can end up pointing at freed garbage. */
2577 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2578 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2579 if (PL_stashcache && hvname_hek) {
2580 DEBUG_o(Perl_deb(aTHX_
2581 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2582 HEKfARG(hvname_hek)));
0ca9877d 2583 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2584 }
b0d55c99
FC		 2585 SvREFCNT_dec(hv);
2586 }
96d7c888
FC		 2587 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2588 && (IoTYPE(io) == IoTYPE_WRONLY ||
2589 IoTYPE(io) == IoTYPE_RDWR ||
2590 IoTYPE(io) == IoTYPE_APPEND)
2591 && ckWARN_d(WARN_IO)
2592 && IoIFP(io) != PerlIO_stdin()
2593 && IoIFP(io) != PerlIO_stdout()
2594 && IoIFP(io) != PerlIO_stderr()
2595 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2596 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2597 SvREFCNT_dec(io);
2598 SvREFCNT_dec(cv);
2599 SvREFCNT_dec(form);
2600
bc81b34d
FC		 2601 /* Possibly reallocated by a destructor */
2602 gp = GvGP(gv);
2603
b0d55c99
FC		 2604 if (!gp->gp_file_hek
2605 && !gp->gp_sv
2606 && !gp->gp_av
2607 && !gp->gp_hv
2608 && !gp->gp_io
2609 && !gp->gp_cv
2610 && !gp->gp_form) break;
2611
2612 if (--attempts == 0) {
2613 Perl_die(aTHX_
2614 "panic: gp_free failed to free glob pointer - "
2615 "something is repeatedly re-creating entries"
2616 );
2617 }
13207a71 2618 }
748a9306 2619
bc81b34d
FC		 2620 /* Possibly incremented by a destructor doing glob assignment */
2621 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2622 Safefree(gp);
c43ae56f 2623 GvGP_set(gv, NULL);
79072805
LW		 2624}
2625
d460ef45
NIS		 2626int
2627Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2628{
53c1dcc0
AL		 2629 AMT * const amtp = (AMT*)mg->mg_ptr;
2630 PERL_UNUSED_ARG(sv);
dd374669 2631
7918f24d
NC		 2632 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2633
d460ef45
NIS		 2634 if (amtp && AMT_AMAGIC(amtp)) {
2635 int i;
2636 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2637 CV * const cv = amtp->table[i];
b37c2d43 2638 if (cv) {
e7881358 2639 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2640 amtp->table[i] = NULL;
d460ef45
NIS		 2641 }
2642 }
2643 }
2644 return 0;
2645}
2646
a0d0e21e 2647/* Updates and caches the CV's */
c3a9a790
RGS		 2648/* Returns:
2649 * 1 on success and there is some overload
2650 * 0 if there is no overload
2651 * -1 if some error occurred and it couldn't croak
2652 */
a0d0e21e 2653
c3a9a790 2654int
242f8760 2655Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2656{
ad64d0ec 2657 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2658 AMT amt;
9b439311 2659 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2660 U32 newgen;
a0d0e21e 2661
7918f24d
NC		 2662 PERL_ARGS_ASSERT_GV_AMUPDATE;
2663
9b439311 2664 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2665 if (mg) {
2666 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2667 if (amtp->was_ok_sub == newgen) {
8c34e50d 2668 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2669 }
ad64d0ec 2670 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2671 }
a0d0e21e 2672
bfcb3514 2673 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2674
d460ef45 2675 Zero(&amt,1,AMT);
e1a479c5 2676 amt.was_ok_sub = newgen;
a6006777 2677 amt.fallback = AMGfallNO;
2678 amt.flags = 0;
2679
a6006777 2680 {
8c34e50d
FC		 2681 int filled = 0;
2682 int i;
3d147ac2
DM		 2683 bool deref_seen = 0;
2684
a6006777 2685
3866ea3b 2686 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2687
89ffc314 2688 /* Try to find via inheritance. */
e6919483 2689 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2690 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2691 CV* cv;
89ffc314
IZ		 2692
2693 if (!gv)
3866ea3b
FC		 2694 {
2695 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2696 goto no_table;
3866ea3b
FC		 2697 }
2698#ifdef PERL_DONT_CREATE_GVSV
2699 else if (!sv) {
6f207bd3 2700 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2701 }
2702#endif
79c9643d
JL		 2703 else if (SvTRUE(sv))
2704 /* don't need to set overloading here because fallback => 1
2705 * is the default setting for classes without overloading */
89ffc314 2706 amt.fallback=AMGfallYES;
79c9643d
JL		 2707 else if (SvOK(sv)) {
2708 amt.fallback=AMGfallNEVER;
386a5489 2709 filled = 1;
386a5489 2710 }
79c9643d 2711 else {
386a5489 2712 filled = 1;
386a5489 2713 }
a6006777 2714
3d147ac2 2715 assert(SvOOK(stash));
3d147ac2 2716 /* initially assume the worst */
339441ef 2717 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2718
8c34e50d 2719 for (i = 1; i < NofAMmeth; i++) {
6136c704 2720 const char * const cooky = PL_AMG_names[i];
32251b26 2721 /* Human-readable form, for debugging: */
8c34e50d 2722 const char * const cp = AMG_id2name(i);
d279ab82 2723 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2724
a0288114 2725 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2726 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2727 /* don't fill the cache while looking up!
2728 Creation of inheritance stubs in intermediate packages may
2729 conflict with the logic of runtime method substitution.
2730 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2731 then we could have created stubs for "(+0" in A and C too.
2732 But if B overloads "bool", we may want to use it for
2733 numifying instead of C's "+0". */
8c34e50d 2734 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2735 cv = 0;
c3ad4e54
FC		 2736 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2737 const HEK * const gvhek =
2738 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2739 const HEK * const stashek =
2740 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2741 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2742 && stashek && HEK_LEN(stashek) == 8
2743 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2744 /* This is a hack to support autoloading..., while
2745 knowing *which* methods were declared as overloaded. */
44a8e56a 2746 /* GvSV contains the name of the method. */
6136c704 2747 GV *ngv = NULL;
c69033f2 2748 SV *gvsv = GvSV(gv);
a0288114
AL		 2749
2750 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2751 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2752 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2753 if (!gvsv || !SvPOK(gvsv)
7f415459 2754 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2755 {
a0288114 2756 /* Can be an import stub (created by "can"). */
242f8760 2757 if (destructing) {
c3a9a790 2758 return -1;
242f8760
RGS		 2759 }
2760 else {
d66cca07
BF		 2761 const SV * const name = (gvsv && SvPOK(gvsv))
2762 ? gvsv
2763 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2764 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2765 Perl_croak(aTHX_ "%s method \"%"SVf256
2766 "\" overloading \"%s\" "\
d0c0e7dd 2767 "in package \"%"HEKf256"\"",
242f8760
RGS		 2768 (GvCVGEN(gv) ? "Stub found while resolving"
2769 : "Can't resolve"),
d66cca07 2770 SVfARG(name), cp,
d0c0e7dd 2771 HEKfARG(
d66cca07 2772 HvNAME_HEK(stash)
d0c0e7dd 2773 ));
242f8760 2774 }
44a8e56a 2775 }
dc848c6f 2776 cv = GvCV(gv = ngv);
44a8e56a 2777 }
b464bac0 2778 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2779 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2780 GvNAME(CvGV(cv))) );
2781 filled = 1;
611c1e95 2782 } else if (gv) { /* Autoloaded... */
ea726b52 2783 cv = MUTABLE_CV(gv);
611c1e95 2784 filled = 1;
44a8e56a 2785 }
ea726b52 2786 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2787
2788 if (gv) {
2789 switch (i) {
2790 case to_sv_amg:
2791 case to_av_amg:
2792 case to_hv_amg:
2793 case to_gv_amg:
2794 case to_cv_amg:
2795 case nomethod_amg:
2796 deref_seen = 1;
2797 break;
2798 }
2799 }
a0d0e21e 2800 }
3d147ac2 2801 if (!deref_seen)
45479970
DM		 2802 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2803 * NB - aux var invalid here, HvARRAY() could have been
2804 * reallocated since it was assigned to */
2805 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2806
a0d0e21e 2807 if (filled) {
a6006777 2808 AMT_AMAGIC_on(&amt);
ad64d0ec 2809 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2810 (char*)&amt, sizeof(AMT));
8c34e50d 2811 return TRUE;
a0d0e21e
LW		 2812 }
2813 }
a6006777 2814 /* Here we have no table: */
8c34e50d 2815 no_table:
a6006777 2816 AMT_AMAGIC_off(&amt);
ad64d0ec 2817 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2818 (char*)&amt, sizeof(AMTS));
c3a9a790 2819 return 0;
a0d0e21e
LW		 2820}
2821
32251b26
IZ		 2822
2823CV*
2824Perl_gv_handler(pTHX_ HV *stash, I32 id)
2825{
3f8f4626 2826 MAGIC *mg;
32251b26 2827 AMT *amtp;
e1a479c5 2828 U32 newgen;
9b439311 2829 struct mro_meta* stash_meta;
32251b26 2830
bfcb3514 2831 if (!stash || !HvNAME_get(stash))
601f1833 2832 return NULL;
e1a479c5 2833
9b439311
BB		 2834 stash_meta = HvMROMETA(stash);
2835 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2836
ad64d0ec 2837 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2838 if (!mg) {
2839 do_update:
8c34e50d 2840 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2841 return NULL;
ad64d0ec 2842 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2843 }
a9fd4e40 2844 assert(mg);
32251b26 2845 amtp = (AMT*)mg->mg_ptr;
66978156 2846 if ( amtp->was_ok_sub != newgen )
32251b26 2847 goto do_update;
3ad83ce7 2848 if (AMT_AMAGIC(amtp)) {
b7787f18 2849 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2850 if (ret && isGV(ret)) { /* Autoloading stab */
2851 /* Passing it through may have resulted in a warning
2852 "Inherited AUTOLOAD for a non-method deprecated", since
2853 our caller is going through a function call, not a method call.
2854 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2855 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2856
2857 if (gv && GvCV(gv))
2858 return GvCV(gv);
2859 }
2860 return ret;
2861 }
a0288114 2862
601f1833 2863 return NULL;
32251b26
IZ		 2864}
2865
2866
6f1401dc
DM		 2867/* Implement tryAMAGICun_MG macro.
2868 Do get magic, then see if the stack arg is overloaded and if so call it.
2869 Flags:
2870 AMGf_set return the arg using SETs rather than assigning to
2871 the targ
2872 AMGf_numeric apply sv_2num to the stack arg.
2873*/
2874
2875bool
2876Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2877 dSP;
2878 SV* tmpsv;
2879 SV* const arg = TOPs;
2880
2881 SvGETMAGIC(arg);
2882
9f8bf298 2883 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2884 AMGf_noright | AMGf_unary
2885 | (flags & AMGf_numarg))))
2886 {
6f1401dc
DM		 2887 if (flags & AMGf_set) {
2888 SETs(tmpsv);
2889 }
2890 else {
2891 dTARGET;
2892 if (SvPADMY(TARG)) {
2893 sv_setsv(TARG, tmpsv);
2894 SETTARG;
2895 }
2896 else
2897 SETs(tmpsv);
2898 }
2899 PUTBACK;
2900 return TRUE;
2901 }
2902
2903 if ((flags & AMGf_numeric) && SvROK(arg))
2904 *sp = sv_2num(arg);
2905 return FALSE;
2906}
2907
2908
2909/* Implement tryAMAGICbin_MG macro.
2910 Do get magic, then see if the two stack args are overloaded and if so
2911 call it.
2912 Flags:
2913 AMGf_set return the arg using SETs rather than assigning to
2914 the targ
2915 AMGf_assign op may be called as mutator (eg +=)
2916 AMGf_numeric apply sv_2num to the stack arg.
2917*/
2918
2919bool
2920Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2921 dSP;
2922 SV* const left = TOPm1s;
2923 SV* const right = TOPs;
2924
2925 SvGETMAGIC(left);
2926 if (left != right)
2927 SvGETMAGIC(right);
2928
2929 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2930 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC		 2931 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2932 | (flags & AMGf_numarg));
6f1401dc
DM		 2933 if (tmpsv) {
2934 if (flags & AMGf_set) {
2935 (void)POPs;
2936 SETs(tmpsv);
2937 }
2938 else {
2939 dATARGET;
2940 (void)POPs;
2941 if (opASSIGN || SvPADMY(TARG)) {
2942 sv_setsv(TARG, tmpsv);
2943 SETTARG;
2944 }
2945 else
2946 SETs(tmpsv);
2947 }
2948 PUTBACK;
2949 return TRUE;
2950 }
2951 }
75ea7a12
FC		 2952 if(left==right && SvGMAGICAL(left)) {
2953 SV * const left = sv_newmortal();
2954 *(sp-1) = left;
2955 /* Print the uninitialized warning now, so it includes the vari-
2956 able name. */
2957 if (!SvOK(right)) {
2958 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2959 sv_setsv_flags(left, &PL_sv_no, 0);
2960 }
2961 else sv_setsv_flags(left, right, 0);
2962 SvGETMAGIC(right);
2963 }
6f1401dc 2964 if (flags & AMGf_numeric) {
75ea7a12
FC		 2965 if (SvROK(TOPm1s))
2966 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2967 if (SvROK(right))
2968 *sp = sv_2num(right);
2969 }
2970 return FALSE;
2971}
2972
25a9ffce
NC		 2973SV *
2974Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2975 SV *tmpsv = NULL;
3d147ac2 2976 HV *stash;
25a9ffce
NC		 2977
2978 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2979
3d147ac2
DM		 2980 if (!SvAMAGIC(ref))
2981 return ref;
2982 /* return quickly if none of the deref ops are overloaded */
2983 stash = SvSTASH(SvRV(ref));
2984 assert(SvOOK(stash));
2985 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2986 return ref;
2987
2988 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2989 AMGf_noright | AMGf_unary))) {
2990 if (!SvROK(tmpsv))
2991 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2992 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2993 /* Bail out if it returns us the same reference. */
2994 return tmpsv;
2995 }
2996 ref = tmpsv;
3d147ac2
DM		 2997 if (!SvAMAGIC(ref))
2998 break;
25a9ffce
NC		 2999 }
3000 return tmpsv ? tmpsv : ref;
3001}
6f1401dc 3002
8d569291
FC		 3003bool
3004Perl_amagic_is_enabled(pTHX_ int method)
3005{
3006 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
3007
3008 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
3009
3010 if ( !lex_mask || !SvOK(lex_mask) )
3011 /* overloading lexically disabled */
3012 return FALSE;
3013 else if ( lex_mask && SvPOK(lex_mask) ) {
3014 /* we have an entry in the hints hash, check if method has been
3015 * masked by overloading.pm */
3016 STRLEN len;
3017 const int offset = method / 8;
3018 const int bit = method % 8;
3019 char *pv = SvPV(lex_mask, len);
3020
3021 /* Bit set, so this overloading operator is disabled */
3022 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
3023 return FALSE;
3024 }
3025 return TRUE;
3026}
3027
a0d0e21e 3028SV*
864dbfa3 3029Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3030{
27da23d5 3031 dVAR;
b267980d 3032 MAGIC *mg;
9c5ffd7c 3033 CV *cv=NULL;
a0d0e21e 3034 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3035 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3036 int off = 0, off1, lr = 0, notfound = 0;
3037 int postpr = 0, force_cpy = 0;
3038 int assign = AMGf_assign & flags;
3039 const int assignshift = assign ? 1 : 0;
bf5522a1 3040 int use_default_op = 0;
67288365 3041 int force_scalar = 0;
497b47a8
JH		 3042#ifdef DEBUGGING
3043 int fl=0;
497b47a8 3044#endif
25716404 3045 HV* stash=NULL;
7918f24d
NC		 3046
3047 PERL_ARGS_ASSERT_AMAGIC_CALL;
3048
e46c382e 3049 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3050 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3051 }
3052
a0d0e21e 3053 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3054 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3055 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3056 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3057 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3058 : NULL))
b267980d 3059 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3060 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3061 * usual method */
497b47a8
JH		 3062 (
3063#ifdef DEBUGGING
3064 fl = 1,
a0288114 3065#endif
497b47a8 3066 cv = cvp[off=method])))) {
a0d0e21e
LW		 3067 lr = -1; /* Call method for left argument */
3068 } else {
3069 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3070 int logic;
3071
3072 /* look for substituted methods */
ee239bfe 3073 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3074 switch (method) {
3075 case inc_amg:
ee239bfe
IZ		 3076 force_cpy = 1;
3077 if ((cv = cvp[off=add_ass_amg])
3078 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3079 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3080 }
3081 break;
3082 case dec_amg:
ee239bfe
IZ		 3083 force_cpy = 1;
3084 if ((cv = cvp[off = subtr_ass_amg])
3085 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3086 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3087 }
3088 break;
3089 case bool__amg:
3090 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3091 break;
3092 case numer_amg:
3093 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3094 break;
3095 case string_amg:
3096 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3097 break;
b7787f18
AL		 3098 case not_amg:
3099 (void)((cv = cvp[off=bool__amg])
3100 || (cv = cvp[off=numer_amg])
3101 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3102 if (cv)
3103 postpr = 1;
b7787f18 3104 break;
748a9306
LW		 3105 case copy_amg:
3106 {
76e3520e
GS		 3107 /*
3108 * SV* ref causes confusion with the interpreter variable of
3109 * the same name
3110 */
890ce7af 3111 SV* const tmpRef=SvRV(left);
76e3520e 3112 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3113 /*
3114 * Just to be extra cautious. Maybe in some
3115 * additional cases sv_setsv is safe, too.
3116 */
890ce7af 3117 SV* const newref = newSVsv(tmpRef);
748a9306 3118 SvOBJECT_on(newref);
a1cd65be
FC		 3119 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3120 delegate to the stash. */
85fbaab2 3121 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3122 return newref;
3123 }
3124 }
3125 break;
a0d0e21e 3126 case abs_amg:
b267980d 3127 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3128 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3129 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3130 if (off1==lt_amg) {
890ce7af 3131 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3132 lt_amg,AMGf_noright);
3133 logic = SvTRUE(lessp);
3134 } else {
890ce7af 3135 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3136 ncmp_amg,AMGf_noright);
3137 logic = (SvNV(lessp) < 0);
3138 }
3139 if (logic) {
3140 if (off==subtr_amg) {
3141 right = left;
748a9306 3142 left = nullsv;
a0d0e21e
LW		 3143 lr = 1;
3144 }
3145 } else {
3146 return left;
3147 }
3148 }
3149 break;
3150 case neg_amg:
155aba94 3151 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3152 right = left;
3153 left = sv_2mortal(newSViv(0));
3154 lr = 1;
3155 }
3156 break;
f216259d 3157 case int_amg:
f5284f61 3158 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3159 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3160 case regexp_amg:
b267980d
NIS		 3161 /* FAIL safe */
3162 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3163
f5284f61
IZ		 3164 case to_sv_amg:
3165 case to_av_amg:
3166 case to_hv_amg:
3167 case to_gv_amg:
3168 case to_cv_amg:
3169 /* FAIL safe */
b267980d 3170 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3171
a0d0e21e
LW		 3172 default:
3173 goto not_found;
3174 }
3175 if (!cv) goto not_found;
3176 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3177 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3178 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3179 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3180 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3181 : NULL))
69815d08
RS		 3182 && (cv = cvp[off=method])) { /* Method for right
3183 * argument found */
3184 lr=1;
bf5522a1
MB		 3185 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3186 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3187 && !(flags & AMGf_unary)) {
3188 /* We look for substitution for
3189 * comparison operations and
fc36a67e 3190 * concatenation */
a0d0e21e
LW		 3191 if (method==concat_amg || method==concat_ass_amg
3192 || method==repeat_amg || method==repeat_ass_amg) {
3193 return NULL; /* Delegate operation to string conversion */
3194 }
3195 off = -1;
3196 switch (method) {
3197 case lt_amg:
3198 case le_amg:
3199 case gt_amg:
3200 case ge_amg:
3201 case eq_amg:
3202 case ne_amg:
2ab54efd
MB		 3203 off = ncmp_amg;
3204 break;
a0d0e21e
LW		 3205 case slt_amg:
3206 case sle_amg:
3207 case sgt_amg:
3208 case sge_amg:
3209 case seq_amg:
3210 case sne_amg:
2ab54efd
MB		 3211 off = scmp_amg;
3212 break;
a0d0e21e 3213 }
bf5522a1
MB		 3214 if (off != -1) {
3215 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3216 cv = ocvp[off];
3217 lr = -1;
3218 }
3219 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3220 cv = cvp[off];
3221 lr = 1;
3222 }
3223 }
3224 if (cv)
2ab54efd
MB		 3225 postpr = 1;
3226 else
3227 goto not_found;
a0d0e21e 3228 } else {
a6006777 3229 not_found: /* No method found, either report or croak */
b267980d
NIS		 3230 switch (method) {
3231 case to_sv_amg:
3232 case to_av_amg:
3233 case to_hv_amg:
3234 case to_gv_amg:
3235 case to_cv_amg:
3236 /* FAIL safe */
3237 return left; /* Delegate operation to standard mechanisms. */
b267980d 3238 }
a0d0e21e
LW		 3239 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3240 notfound = 1; lr = -1;
3241 } else if (cvp && (cv=cvp[nomethod_amg])) {
3242 notfound = 1; lr = 1;
bf5522a1
MB		 3243 } else if ((use_default_op =
3244 (!ocvp || oamtp->fallback >= AMGfallYES)
3245 && (!cvp || amtp->fallback >= AMGfallYES))
3246 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3247 /* Skip generating the "no method found" message. */
3248 return NULL;
a0d0e21e 3249 } else {
46fc3d4c 3250 SV *msg;
774d564b 3251 if (off==-1) off=method;
b267980d 3252 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3253 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3254 AMG_id2name(method + assignshift),
3255 (flags & AMGf_unary ? " " : "\n\tleft "),
3256 SvAMAGIC(left)?
3257 "in overloaded package ":
3258 "has no overloaded magic",
3259 SvAMAGIC(left)?
3260 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3261 SVfARG(&PL_sv_no),
3262 SvAMAGIC(right)?
3263 ",\n\tright argument in overloaded package ":
3264 (flags & AMGf_unary
3265 ? ""
3266 : ",\n\tright argument has no overloaded magic"),
3267 SvAMAGIC(right)?
3268 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3269 SVfARG(&PL_sv_no)));
bf5522a1 3270 if (use_default_op) {
d66cca07 3271 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3272 } else {
be2597df 3273 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3274 }
3275 return NULL;
3276 }
ee239bfe 3277 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3278 }
3279 }
67288365
JL		 3280
3281 switch (method) {
3282 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3283 * operation. we need this to return a value, so that it can be assigned
3284 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3285 * increment or decrement was itself called in void context */
3286 case inc_amg:
3287 if (off == add_amg)
3288 force_scalar = 1;
3289 break;
3290 case dec_amg:
3291 if (off == subtr_amg)
3292 force_scalar = 1;
3293 break;
3294 /* in these cases, we're calling an assignment variant of an operator
3295 * (+= rather than +, for instance). regardless of whether it's a
3296 * fallback or not, it always has to return a value, which will be
3297 * assigned to the proper variable later */
3298 case add_amg:
3299 case subtr_amg:
3300 case mult_amg:
3301 case div_amg:
3302 case modulo_amg:
3303 case pow_amg:
3304 case lshift_amg:
3305 case rshift_amg:
3306 case repeat_amg:
3307 case concat_amg:
3308 case band_amg:
3309 case bor_amg:
3310 case bxor_amg:
6d06ecce
FC		 3311 case sband_amg:
3312 case sbor_amg:
3313 case sbxor_amg:
67288365
JL		 3314 if (assign)
3315 force_scalar = 1;
3316 break;
3317 /* the copy constructor always needs to return a value */
3318 case copy_amg:
3319 force_scalar = 1;
3320 break;
3321 /* because of the way these are implemented (they don't perform the
3322 * dereferencing themselves, they return a reference that perl then
3323 * dereferences later), they always have to be in scalar context */
3324 case to_sv_amg:
3325 case to_av_amg:
3326 case to_hv_amg:
3327 case to_gv_amg:
3328 case to_cv_amg:
3329 force_scalar = 1;
3330 break;
3331 /* these don't have an op of their own; they're triggered by their parent
3332 * op, so the context there isn't meaningful ('$a and foo()' in void
3333 * context still needs to pass scalar context on to $a's bool overload) */
3334 case bool__amg:
3335 case numer_amg:
3336 case string_amg:
3337 force_scalar = 1;
3338 break;
3339 }
3340
497b47a8 3341#ifdef DEBUGGING
a0d0e21e 3342 if (!notfound) {
497b47a8 3343 DEBUG_o(Perl_deb(aTHX_
d66cca07 3344 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3345 AMG_id2name(off),
3346 method+assignshift==off? "" :
a0288114 3347 " (initially \"",
497b47a8
JH		 3348 method+assignshift==off? "" :
3349 AMG_id2name(method+assignshift),
a0288114 3350 method+assignshift==off? "" : "\")",
497b47a8
JH		 3351 flags & AMGf_unary? "" :
3352 lr==1 ? " for right argument": " for left argument",
3353 flags & AMGf_unary? " for argument" : "",
d66cca07 3354 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3355 fl? ",\n\tassignment variant used": "") );
ee239bfe 3356 }
497b47a8 3357#endif
748a9306
LW		 3358 /* Since we use shallow copy during assignment, we need
3359 * to dublicate the contents, probably calling user-supplied
3360 * version of copy operator
3361 */
ee239bfe
IZ		 3362 /* We need to copy in following cases:
3363 * a) Assignment form was called.
3364 * assignshift==1, assign==T, method + 1 == off
3365 * b) Increment or decrement, called directly.
3366 * assignshift==0, assign==0, method + 0 == off
3367 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3368 * assignshift==0, assign==T,
ee239bfe
IZ		 3369 * force_cpy == T
3370 * d) Increment or decrement, translated to nomethod.
b267980d 3371 * assignshift==0, assign==0,
ee239bfe
IZ		 3372 * force_cpy == T
3373 * e) Assignment form translated to nomethod.
3374 * assignshift==1, assign==T, method + 1 != off
3375 * force_cpy == T
3376 */
3377 /* off is method, method+assignshift, or a result of opcode substitution.
3378 * In the latter case assignshift==0, so only notfound case is important.
3379 */
73512201 3380 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3381 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3382 || force_cpy) )
6f1401dc 3383 {
1b38c28e
NC		 3384 /* newSVsv does not behave as advertised, so we copy missing
3385 * information by hand */
3386 SV *tmpRef = SvRV(left);
3387 SV *rv_copy;
31d632c3 3388 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3389 SvRV_set(left, rv_copy);
3390 SvSETMAGIC(left);
e7881358 3391 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3392 }
6f1401dc
DM		 3393 }
3394
a0d0e21e
LW		 3395 {
3396 dSP;
3397 BINOP myop;
3398 SV* res;
b7787f18 3399 const bool oldcatch = CATCH_GET;
67288365 3400 I32 oldmark, nret;
1c23e2bd 3401 U8 gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3402
54310121 3403 CATCH_SET(TRUE);
a0d0e21e
LW		 3404 Zero(&myop, 1, BINOP);
3405 myop.op_last = (OP *) &myop;
b37c2d43 3406 myop.op_next = NULL;
67288365
JL		 3407 myop.op_flags = OPf_STACKED;
3408
3409 switch (gimme) {
3410 case G_VOID:
3411 myop.op_flags |= OPf_WANT_VOID;
3412 break;
3413 case G_ARRAY:
3414 if (flags & AMGf_want_list) {
3415 myop.op_flags |= OPf_WANT_LIST;
3416 break;
3417 }
3418 /* FALLTHROUGH */
3419 default:
3420 myop.op_flags |= OPf_WANT_SCALAR;
3421 break;
3422 }
a0d0e21e 3423
e788e7d3 3424 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3425 ENTER;
462e5cf6 3426 SAVEOP();
533c011a 3427 PL_op = (OP *) &myop;
3280af22 3428 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3429 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3430 Perl_pp_pushmark(aTHX);
a0d0e21e 3431
924508f0 3432 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3433 PUSHs(lr>0? right: left);
3434 PUSHs(lr>0? left: right);
3280af22 3435 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3436 if (notfound) {
59cd0e26
NC		 3437 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3438 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3439 }
636ac8fc
FC		 3440 else if (flags & AMGf_numarg)
3441 PUSHs(&PL_sv_undef);
3442 if (flags & AMGf_numarg)
3443 PUSHs(&PL_sv_yes);
ad64d0ec 3444 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3445 PUTBACK;
67288365 3446 oldmark = TOPMARK;
a0d0e21e 3447
139d0ce6 3448 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3449 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3450 LEAVE;
3451 SPAGAIN;
67288365
JL		 3452 nret = SP - (PL_stack_base + oldmark);
3453
3454 switch (gimme) {
3455 case G_VOID:
3456 /* returning NULL has another meaning, and we check the context
3457 * at the call site too, so this can be differentiated from the
3458 * scalar case */
3459 res = &PL_sv_undef;
3460 SP = PL_stack_base + oldmark;
3461 break;
3462 case G_ARRAY: {
3463 if (flags & AMGf_want_list) {
3464 res = sv_2mortal((SV *)newAV());
3465 av_extend((AV *)res, nret);
3466 while (nret--)
3467 av_store((AV *)res, nret, POPs);
3468 break;
3469 }
3470 /* FALLTHROUGH */
3471 }
3472 default:
3473 res = POPs;
3474 break;
3475 }
a0d0e21e 3476
ebafeae7 3477 PUTBACK;
d3acc0f7 3478 POPSTACK;
54310121 3479 CATCH_SET(oldcatch);
a0d0e21e 3480
a0d0e21e 3481 if (postpr) {
b7787f18 3482 int ans;
a0d0e21e
LW		 3483 switch (method) {
3484 case le_amg:
3485 case sle_amg:
3486 ans=SvIV(res)<=0; break;
3487 case lt_amg:
3488 case slt_amg:
3489 ans=SvIV(res)<0; break;
3490 case ge_amg:
3491 case sge_amg:
3492 ans=SvIV(res)>=0; break;
3493 case gt_amg:
3494 case sgt_amg:
3495 ans=SvIV(res)>0; break;
3496 case eq_amg:
3497 case seq_amg:
3498 ans=SvIV(res)==0; break;
3499 case ne_amg:
3500 case sne_amg:
3501 ans=SvIV(res)!=0; break;
3502 case inc_amg:
3503 case dec_amg:
bbce6d69 3504 SvSetSV(left,res); return left;
dc437b57 3505 case not_amg:
fe7ac86a 3506 ans=!SvTRUE(res); break;
b7787f18
AL		 3507 default:
3508 ans=0; break;
a0d0e21e 3509 }
54310121 3510 return boolSV(ans);
748a9306
LW		 3511 } else if (method==copy_amg) {
3512 if (!SvROK(res)) {
cea2e8a9 3513 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3514 }
3515 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3516 } else {
3517 return res;
3518 }
3519 }
3520}
c9d5ac95 3521
f5c1e807
NC		 3522void
3523Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3524{
3525 dVAR;
acda4c6a 3526 U32 hash;
f5c1e807 3527
7918f24d 3528 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3529
acda4c6a
NC		 3530 if (len > I32_MAX)
3531 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3532
ae8cc45f
NC		 3533 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3534 unshare_hek(GvNAME_HEK(gv));
3535 }
3536
acda4c6a 3537 PERL_HASH(hash, name, len);
c60dbbc3 3538 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3539}
3540
66610fdd 3541/*
f7461760
Z		 3542=for apidoc gv_try_downgrade
3543
2867cdbc
Z		 3544If the typeglob C<gv> can be expressed more succinctly, by having
3545something other than a real GV in its place in the stash, replace it
3546with the optimised form. Basic requirements for this are that C<gv>
3547is a real typeglob, is sufficiently ordinary, and is only referenced
3548from its package. This function is meant to be used when a GV has been
3549looked up in part to see what was there, causing upgrading, but based
3550on what was found it turns out that the real GV isn't required after all.
3551
3552If C<gv> is a completely empty typeglob, it is deleted from the stash.
3553
3554If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3555sub, the typeglob is replaced with a scalar-reference placeholder that
3556more compactly represents the same thing.
f7461760
Z		 3557
3558=cut
3559*/
3560
3561void
3562Perl_gv_try_downgrade(pTHX_ GV *gv)
3563{
3564 HV *stash;
3565 CV *cv;
3566 HEK *namehek;
3567 SV **gvp;
3568 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3569
3570 /* XXX Why and where does this leave dangling pointers during global
3571 destruction? */
627364f1 3572 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3573
2867cdbc 3574 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3575 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3576 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3577 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3578 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3579 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3580 return;
2be08ad1
FC		 3581 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3582 return;
803f2748
DM		 3583 if (SvMAGICAL(gv)) {
3584 MAGIC *mg;
3585 /* only backref magic is allowed */
3586 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3587 return;
3588 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3589 if (mg->mg_type != PERL_MAGIC_backref)
3590 return;
3591 }
3592 }
2867cdbc
Z		 3593 cv = GvCV(gv);
3594 if (!cv) {
3595 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3596 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3597 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3598 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3599 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3600 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3601 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3602 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3603 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3604 *gvp == (SV*)gv) {
3605 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3606 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3607 SvREFCNT(gv) = 0;
3608 sv_clear((SV*)gv);
3609 SvREFCNT(gv) = 1;
70e5f2b5 3610 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3611
3612 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3613 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3614 STRUCT_OFFSET(XPVIV, xiv_iv));
3615 SvRV_set(gv, value);
3616 }
3617}
3618
9e3fb20c
FC		 3619GV *
3620Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3621{
3622 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3623 GV * const *gvp;
3624 PERL_ARGS_ASSERT_GV_OVERRIDE;
3625 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3626 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3627 gv = gvp ? *gvp : NULL;
3628 if (gv && !isGV(gv)) {
3629 if (!SvPCS_IMPORTED(gv)) return NULL;
3630 gv_init(gv, PL_globalstash, name, len, 0);
3631 return gv;
3632 }
3633 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3634}
3635
4aaa4757
FC		 3636#include "XSUB.h"
3637
3638static void
3639core_xsub(pTHX_ CV* cv)
3640{
3641 Perl_croak(aTHX_
3642 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3643 );
3644}
3645
f7461760 3646/*
14d04a33 3647 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3648 */
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