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op_dump() - remove extra indentation from PMOP
[perl5.git] / gv.c
CommitLineData
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':
3092ee0c
YO		 1859 if (
1860 len >= 6 && name[1] == 'X' &&
1861 (memEQs(name, len, "EXPORT")
eafd371c
YO		 1862 ||memEQs(name, len, "EXPORT_OK")
1863 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1864 ||memEQs(name, len, "EXPORT_TAGS"))
eafd371c 1865 )
cc4c2da6
NC		 1866 GvMULTI_on(gv);
1867 break;
1868 case 'I':
eafd371c 1869 if (memEQs(name, len, "ISA"))
290a1700 1870 gv_magicalize_isa(gv);
cc4c2da6 1871 break;
44428a46 1872 case 'V':
eafd371c 1873 if (memEQs(name, len, "VERSION"))
44428a46
FC		 1874 GvMULTI_on(gv);
1875 break;
ea238638 1876 case 'a':
eafd371c 1877 if (stash == PL_debstash && memEQs(name, len, "args")) {
7bb33634
FC		 1878 GvMULTI_on(gv_AVadd(gv));
1879 break;
eafd371c
YO		 1880 }
1881 /* FALLTHROUGH */
ea238638
FC		 1882 case 'b':
1883 if (len == 1 && sv_type == SVt_PV)
1884 GvMULTI_on(gv);
924ba076 1885 /* FALLTHROUGH */
4aaa4757
FC		 1886 default:
1887 goto try_core;
1888 }
1321bbe3 1889 goto ret;
4aaa4757
FC		 1890 }
1891 try_core:
1892 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1893 /* Avoid null warning: */
1894 const char * const stashname = HvNAME(stash); assert(stashname);
4c4f3c46 1895 if (strEQs(stashname, "CORE"))
87566176 1896 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1897 }
1898 }
1899 else if (len > 1) {
1900#ifndef EBCDIC
1901 if (*name > 'V' ) {
1902 NOOP;
1903 /* Nothing else to do.
1904 The compiler will probably turn the switch statement into a
1905 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1906 the common case of lower case variable names. (On EBCDIC
1907 platforms, we can't just do:
1908 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1909 because cases like '\027' in the switch statement below are
1910 C1 (non-ASCII) controls on those platforms, so the remapping
1911 would make them larger than 'V')
1912 */
44428a46
FC		 1913 } else
1914#endif
1915 {
44428a46
FC		 1916 switch (*name) {
1917 case 'A':
eafd371c 1918 if (memEQs(name, len, "ARGV")) {
44428a46
FC		 1919 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1920 }
eafd371c 1921 else if (memEQs(name, len, "ARGVOUT")) {
44428a46
FC		 1922 GvMULTI_on(gv);
1923 }
1924 break;
1925 case 'E':
3092ee0c
YO		 1926 if (
1927 len >= 6 && name[1] == 'X' &&
1928 (memEQs(name, len, "EXPORT")
055ae706
YO		 1929 ||memEQs(name, len, "EXPORT_OK")
1930 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1931 ||memEQs(name, len, "EXPORT_TAGS"))
055ae706 1932 )
44428a46
FC		 1933 GvMULTI_on(gv);
1934 break;
1935 case 'I':
eafd371c 1936 if (memEQs(name, len, "ISA")) {
290a1700 1937 gv_magicalize_isa(gv);
44428a46
FC		 1938 }
1939 break;
cc4c2da6 1940 case 'S':
eafd371c 1941 if (memEQs(name, len, "SIG")) {
cc4c2da6
NC		 1942 HV *hv;
1943 I32 i;
d525a7b2
NC		 1944 if (!PL_psig_name) {
1945 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1946 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1947 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1948 } else {
1949 /* I think that the only way to get here is to re-use an
1950 embedded perl interpreter, where the previous
1951 use didn't clean up fully because
1952 PL_perl_destruct_level was 0. I'm not sure that we
1953 "support" that, in that I suspect in that scenario
1954 there are sufficient other garbage values left in the
1955 interpreter structure that something else will crash
1956 before we get here. I suspect that this is one of
1957 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1958 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1959 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1960 }
1961 GvMULTI_on(gv);
1962 hv = GvHVn(gv);
a0714e2c 1963 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1964 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1965 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1966 if (init)
1967 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1968 }
1969 }
1970 break;
1971 case 'V':
eafd371c 1972 if (memEQs(name, len, "VERSION"))
cc4c2da6
NC		 1973 GvMULTI_on(gv);
1974 break;
e5218da5 1975 case '\003': /* $^CHILD_ERROR_NATIVE */
eafd371c 1976 if (memEQs(name, len, "\003HILD_ERROR_NATIVE"))
e5218da5 1977 goto magicalize;
27deb0cf
YO		 1978 /* @{^CAPTURE} %{^CAPTURE} */
1979 if (memEQs(name, len, "\003APTURE")) {
1980 AV* const av = GvAVn(gv);
1981 UV uv= *name;
1982
1983 sv_magic(MUTABLE_SV(av), (SV*)uv, PERL_MAGIC_regdata, NULL, 0);
1984 SvREADONLY_on(av);
1985
1986 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1987 require_tie_mod_s(gv, '-', "Tie::Hash::NamedCapture",0);
1988
1989 } else /* %{^CAPTURE_ALL} */
1990 if (memEQs(name, len, "\003APTURE_ALL")) {
1991 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1992 require_tie_mod_s(gv, '+', "Tie::Hash::NamedCapture",0);
1993 }
e5218da5 1994 break;
cc4c2da6 1995 case '\005': /* $^ENCODING */
eafd371c 1996 if (memEQs(name, len, "\005NCODING"))
cc4c2da6
NC		 1997 goto magicalize;
1998 break;
9ebf26ad 1999 case '\007': /* $^GLOBAL_PHASE */
eafd371c 2000 if (memEQs(name, len, "\007LOBAL_PHASE"))
9ebf26ad
FR		 2001 goto ro_magicalize;
2002 break;
8561ea1d 2003 case '\014': /* $^LAST_FH */
eafd371c 2004 if (memEQs(name, len, "\014AST_FH"))
8561ea1d
FC		 2005 goto ro_magicalize;
2006 break;
cde0cee5 2007 case '\015': /* $^MATCH */
eafd371c 2008 if (memEQs(name, len, "\015ATCH")) {
960b831f
NC		 2009 paren = RX_BUFF_IDX_CARET_FULLMATCH;
2010 goto storeparen;
2011 }
66230c86 2012 break;
cc4c2da6 2013 case '\017': /* $^OPEN */
eafd371c 2014 if (memEQs(name, len, "\017PEN"))
cc4c2da6
NC		 2015 goto magicalize;
2016 break;
cde0cee5 2017 case '\020': /* $^PREMATCH $^POSTMATCH */
eafd371c 2018 if (memEQs(name, len, "\020REMATCH")) {
960b831f
NC		 2019 paren = RX_BUFF_IDX_CARET_PREMATCH;
2020 goto storeparen;
2021 }
eafd371c 2022 if (memEQs(name, len, "\020OSTMATCH")) {
960b831f
NC		 2023 paren = RX_BUFF_IDX_CARET_POSTMATCH;
2024 goto storeparen;
2025 }
9ebf26ad 2026 break;
cc4c2da6 2027 case '\024': /* ${^TAINT} */
eafd371c 2028 if (memEQs(name, len, "\024AINT"))
cc4c2da6
NC		 2029 goto ro_magicalize;
2030 break;
7cebcbc0 2031 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
eafd371c 2032 if (memEQs(name, len, "\025NICODE"))
cc4c2da6 2033 goto ro_magicalize;
eafd371c 2034 if (memEQs(name, len, "\025TF8LOCALE"))
7cebcbc0 2035 goto ro_magicalize;
eafd371c 2036 if (memEQs(name, len, "\025TF8CACHE"))
e07ea26a 2037 goto magicalize;
cc4c2da6
NC		 2038 break;
2039 case '\027': /* $^WARNING_BITS */
eafd371c 2040 if (memEQs(name, len, "\027ARNING_BITS"))
cc4c2da6 2041 goto magicalize;
8ca2a5d6 2042#ifdef WIN32
eafd371c 2043 else if (memEQs(name, len, "\027IN32_SLOPPY_STAT"))
8ca2a5d6
DD		 2044 goto magicalize;
2045#endif
cc4c2da6
NC		 2046 break;
2047 case '1':
2048 case '2':
2049 case '3':
2050 case '4':
2051 case '5':
2052 case '6':
2053 case '7':
2054 case '8':
2055 case '9':
85e6fe83 2056 {
2fdbfb4d
AB		 2057 /* Ensures that we have an all-digit variable, ${"1foo"} fails
2058 this test */
22ff3130
HS		 2059 UV uv;
2060 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1321bbe3 2061 goto ret;
22ff3130
HS		 2062 /* XXX why are we using a SSize_t? */
2063 paren = (SSize_t)(I32)uv;
960b831f 2064 goto storeparen;
1d7c1841 2065 }
dc437b57 2066 }
93a17b20 2067 }
392db708
NC		 2068 } else {
2069 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2070 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2071 switch (*name) {
6361f656 2072 case '&': /* $& */
960b831f
NC		 2073 paren = RX_BUFF_IDX_FULLMATCH;
2074 goto sawampersand;
6361f656 2075 case '`': /* $` */
960b831f
NC		 2076 paren = RX_BUFF_IDX_PREMATCH;
2077 goto sawampersand;
6361f656 2078 case '\'': /* $' */
960b831f
NC		 2079 paren = RX_BUFF_IDX_POSTMATCH;
2080 sawampersand:
1a904fc8 2081#ifdef PERL_SAWAMPERSAND
a289ef89 2082 if (!(
cc4c2da6
NC		 2083 sv_type == SVt_PVAV ||
2084 sv_type == SVt_PVHV ||
2085 sv_type == SVt_PVCV ||
2086 sv_type == SVt_PVFM ||
2087 sv_type == SVt_PVIO
d3b97530
DM		 2088 )) { PL_sawampersand |=
2089 (*name == '`')
2090 ? SAWAMPERSAND_LEFT
2091 : (*name == '&')
2092 ? SAWAMPERSAND_MIDDLE
2093 : SAWAMPERSAND_RIGHT;
2094 }
1a904fc8 2095#endif
960b831f 2096 goto storeparen;
e91d8259
NC		 2097 case '1': /* $1 */
2098 case '2': /* $2 */
2099 case '3': /* $3 */
2100 case '4': /* $4 */
2101 case '5': /* $5 */
2102 case '6': /* $6 */
2103 case '7': /* $7 */
2104 case '8': /* $8 */
2105 case '9': /* $9 */
960b831f
NC		 2106 paren = *name - '0';
2107
2108 storeparen:
e91d8259
NC		 2109 /* Flag the capture variables with a NULL mg_ptr
2110 Use mg_len for the array index to lookup. */
960b831f 2111 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2112 break;
cc4c2da6 2113
6361f656 2114 case ':': /* $: */
c69033f2 2115 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2116 goto magicalize;
2117
6361f656 2118 case '?': /* $? */
ff0cee69 2119#ifdef COMPLEX_STATUS
c69033f2 2120 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2121#endif
cc4c2da6 2122 goto magicalize;
ff0cee69 2123
6361f656 2124 case '!': /* $! */
67261566 2125 GvMULTI_on(gv);
44a2ac75 2126 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2127
ad64d0ec 2128 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2129
7c719134 2130 /* magicalization must be done before require_tie_mod_s is called */
67261566 2131 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
7c719134 2132 require_tie_mod_s(gv, '!', "Errno", 1);
d2c93421 2133
6cef1e77 2134 break;
754f85ad
YO		 2135 case '-': /* $-, %-, @- */
2136 case '+': /* $+, %+, @+ */
27deb0cf
YO		 2137 GvMULTI_on(gv); /* no used once warnings here */
2138 { /* $- $+ */
2139 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2140 if (*name == '+')
2141 SvREADONLY_on(GvSVn(gv));
2142 }
2143 { /* %- %+ */
2144 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2145 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture",0);
2146 }
2147 { /* @- @+ */
2148 AV* const av = GvAVn(gv);
2149 const UV uv = (UV)*name;
67261566 2150
27deb0cf
YO		 2151 sv_magic(MUTABLE_SV(av), (SV*)uv, PERL_MAGIC_regdata, NULL, 0);
2152 SvREADONLY_on(av);
2153 }
80305961 2154 break;
6361f656
AB		 2155 case '*': /* $* */
2156 case '#': /* $# */
9b387841 2157 if (sv_type == SVt_PV)
4f650b80 2158 /* diag_listed_as: $* is no longer supported */
9b387841 2159 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2160 "$%c is no longer supported", *name);
8ae1fe26 2161 break;
b3ca2e83
NC		 2162 case '\010': /* $^H */
2163 {
2164 HV *const hv = GvHVn(gv);
2165 hv_magic(hv, NULL, PERL_MAGIC_hints);
2166 }
2167 goto magicalize;
b82b06b8 2168 case '[': /* $[ */
7d69d4a6 2169 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2170 && FEATURE_ARYBASE_IS_ENABLED) {
7c719134 2171 require_tie_mod_s(gv,'[',"arybase",0);
b82b06b8 2172 }
7d69d4a6 2173 else goto magicalize;
b82b06b8 2174 break;
cc4c2da6 2175 case '\023': /* $^S */
2fdbfb4d
AB		 2176 ro_magicalize:
2177 SvREADONLY_on(GvSVn(gv));
924ba076 2178 /* FALLTHROUGH */
6361f656 2179 case '0': /* $0 */
6361f656
AB		 2180 case '^': /* $^ */
2181 case '~': /* $~ */
2182 case '=': /* $= */
2183 case '%': /* $% */
2184 case '.': /* $. */
2185 case '(': /* $( */
2186 case ')': /* $) */
2187 case '<': /* $< */
2188 case '>': /* $> */
2189 case '\\': /* $\ */
2190 case '/': /* $/ */
4505a31f 2191 case '|': /* $| */
9cdac2a2 2192 case '$': /* $$ */
cc4c2da6
NC		 2193 case '\001': /* $^A */
2194 case '\003': /* $^C */
2195 case '\004': /* $^D */
2196 case '\005': /* $^E */
2197 case '\006': /* $^F */
cc4c2da6
NC		 2198 case '\011': /* $^I, NOT \t in EBCDIC */
2199 case '\016': /* $^N */
2200 case '\017': /* $^O */
2201 case '\020': /* $^P */
2202 case '\024': /* $^T */
2203 case '\027': /* $^W */
2204 magicalize:
ad64d0ec 2205 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2206 break;
e521374c 2207
cc4c2da6 2208 case '\014': /* $^L */
76f68e9b 2209 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2210 break;
6361f656 2211 case ';': /* $; */
76f68e9b 2212 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2213 break;
6361f656 2214 case ']': /* $] */
cc4c2da6 2215 {
3638bf15 2216 SV * const sv = GvSV(gv);
d7aa5382 2217 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2218 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2219 GvSV(gv) = vnumify(PL_patchlevel);
2220 SvREADONLY_on(GvSV(gv));
2221 SvREFCNT_dec(sv);
93a17b20
LW		 2222 }
2223 break;
cc4c2da6
NC		 2224 case '\026': /* $^V */
2225 {
3638bf15 2226 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2227 GvSV(gv) = new_version(PL_patchlevel);
2228 SvREADONLY_on(GvSV(gv));
2229 SvREFCNT_dec(sv);
16070b82
GS		 2230 }
2231 break;
ea238638
FC		 2232 case 'a':
2233 case 'b':
dc3e91f6 2234 if (sv_type == SVt_PV)
ea238638 2235 GvMULTI_on(gv);
cc4c2da6 2236 }
79072805 2237 }
930867a8 2238
1321bbe3
FC		 2239 ret:
2240 /* Return true if we actually did something. */
2241 return GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv)
2242 || ( GvSV(gv) && (
2243 SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv))
2244 )
2245 );
71c35c05
BF		 2246}
2247
8c995aba
FC		 2248/* If we do ever start using this later on in the file, we need to make
2249 sure we don’t accidentally use the wrong definition. */
2250#undef SvREADONLY_on
2251
070dc475
BF		 2252/* This function is called when the stash already holds the GV of the magic
2253 * variable we're looking for, but we need to check that it has the correct
2254 * kind of magic. For example, if someone first uses $! and then %!, the
2255 * latter would end up here, and we add the Errno tie to the HASH slot of
2256 * the *! glob.
2257 */
2258PERL_STATIC_INLINE void
2259S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2260{
2261 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2262
2263 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2264 if (*name == '!')
7c719134 2265 require_tie_mod_s(gv, '!', "Errno", 1);
070dc475 2266 else if (*name == '-' || *name == '+')
7c719134 2267 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture", 0);
070dc475
BF		 2268 } else if (sv_type == SVt_PV) {
2269 if (*name == '*' || *name == '#') {
2270 /* diag_listed_as: $* is no longer supported */
2271 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2272 WARN_SYNTAX),
2273 "$%c is no longer supported", *name);
2274 }
2275 }
2276 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2277 switch (*name) {
2278 case '[':
7c719134 2279 require_tie_mod_s(gv,'[',"arybase",0);
070dc475
BF		 2280 break;
2281#ifdef PERL_SAWAMPERSAND
2282 case '`':
2283 PL_sawampersand |= SAWAMPERSAND_LEFT;
2284 (void)GvSVn(gv);
2285 break;
2286 case '&':
2287 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2288 (void)GvSVn(gv);
2289 break;
2290 case '\'':
2291 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2292 (void)GvSVn(gv);
2293 break;
2294#endif
2295 }
2296 }
2297}
2298
71c35c05
BF		 2299GV *
2300Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2301 const svtype sv_type)
2302{
71c35c05
BF		 2303 const char *name = nambeg;
2304 GV *gv = NULL;
2305 GV**gvp;
2306 STRLEN len;
2307 HV *stash = NULL;
2308 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2309 const I32 no_expand = flags & GV_NOEXPAND;
2310 const I32 add = flags & ~GV_NOADD_MASK;
2311 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2312 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2313 const char *const name_end = nambeg + full_len;
2314 U32 faking_it;
2315
2316 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2317
2318 /* If we have GV_NOTQUAL, the caller promised that
2319 * there is no stash, so we can skip the check.
2320 * Similarly if full_len is 0, since then we're
2321 * dealing with something like *{""} or ""->foo()
2322 */
2323 if ((flags & GV_NOTQUAL) || !full_len) {
2324 len = full_len;
2325 }
2326 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2327 if (name == name_end) return gv;
2328 }
2329 else {
2330 return NULL;
2331 }
2332
2333 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2334 return NULL;
2335 }
2336
2337 /* By this point we should have a stash and a name */
c161da64 2338 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2339 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2340 if (addmg) gv = (GV *)newSV(0);
2341 else return NULL;
2342 }
2343 else gv = *gvp, addmg = 0;
2344 /* From this point on, addmg means gv has not been inserted in the
2345 symtab yet. */
2346
2347 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2348 /* The GV already exists, so return it, but check if we need to do
2349 * anything else with it before that.
2350 */
71c35c05 2351 if (add) {
c002ae9a
BF		 2352 /* This is the heuristic that handles if a variable triggers the
2353 * 'used only once' warning. If there's already a GV in the stash
2354 * with this name, then we assume that the variable has been used
2355 * before and turn its MULTI flag on.
2356 * It's a heuristic because it can easily be "tricked", like with
2357 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2358 * not warning about $main::foo being used just once
2359 */
71c35c05
BF		 2360 GvMULTI_on(gv);
2361 gv_init_svtype(gv, sv_type);
2362 /* You reach this path once the typeglob has already been created,
2363 either by the same or a different sigil. If this path didn't
2364 exist, then (say) referencing $! first, and %! second would
2365 mean that %! was not handled correctly. */
2366 if (len == 1 && stash == PL_defstash) {
070dc475 2367 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2368 }
2369 else if (len == 3 && sv_type == SVt_PVAV
eafd371c 2370 && strEQs(name, "ISA")
71c35c05
BF		 2371 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2372 gv_magicalize_isa(gv);
2373 }
2374 return gv;
2375 } else if (no_init) {
2376 assert(!addmg);
2377 return gv;
c002ae9a
BF		 2378 }
2379 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2380 * don't expand it to a glob. This is an optimization so that things
2381 * copying constants over, like Exporter, don't have to be rewritten
2382 * to take into account that you can store more than just globs in
2383 * stashes.
2384 */
2385 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2386 assert(!addmg);
2387 return gv;
2388 }
2389
2390 /* Adding a new symbol.
2391 Unless of course there was already something non-GV here, in which case
2392 we want to behave as if there was always a GV here, containing some sort
2393 of subroutine.
2394 Otherwise we run the risk of creating things like GvIO, which can cause
2395 subtle bugs. eg the one that tripped up SQL::Translator */
2396
2397 faking_it = SvOK(gv);
2398
2399 if (add & GV_ADDWARN)
2400 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2401 "Had to create %"UTF8f" unexpectedly",
2402 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2403 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2404
9e5de6ae 2405 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2406 GvMULTI_on(gv) ;
2407
2408 /* set up magic where warranted */
1321bbe3 2409 if ( gv_magicalize(gv, stash, name, len, sv_type) ) {
930867a8 2410 /* See 23496c6 */
1321bbe3
FC		 2411 if (addmg) {
2412 /* gv_magicalize magicalised this gv, so we want it
930867a8 2413 * stored in the symtab.
1321bbe3
FC		 2414 * Effectively the caller is asking, ‘Does this gv exist?’
2415 * And we respond, ‘Er, *now* it does!’
930867a8
BF		 2416 */
2417 (void)hv_store(stash,name,len,(SV *)gv,0);
1321bbe3
FC		 2418 }
2419 }
2420 else if (addmg) {
2421 /* The temporary GV created above */
930867a8
BF		 2422 SvREFCNT_dec_NN(gv);
2423 gv = NULL;
930867a8 2424 }
71c35c05 2425
e6066781 2426 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2427 return gv;
79072805
LW		 2428}
2429
2430void
35a4481c 2431Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2432{
ed60a868 2433 const char *name;
35a4481c 2434 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2435
2436 PERL_ARGS_ASSERT_GV_FULLNAME4;
2437
666ea192 2438 sv_setpv(sv, prefix ? prefix : "");
a0288114 2439
52a6327b 2440 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2441 const STRLEN len = HvNAMELEN(hv);
2442 if (keepmain || strnNE(name, "main", len)) {
2443 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2444 sv_catpvs(sv,"::");
ed60a868 2445 }
43693395 2446 }
ed60a868 2447 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2448 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2449}
2450
2451void
35a4481c 2452Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2453{
099be4f1 2454 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2455
2456 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2457
46c461b5 2458 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2459}
2460
39a65960
DM		 2461
2462/* recursively scan a stash and any nested stashes looking for entries
2463 * that need the "only used once" warning raised
2464 */
2465
79072805 2466void
51da40ed 2467Perl_gv_check(pTHX_ HV *stash)
79072805 2468{
eb578fdb 2469 I32 i;
463ee0b2 2470
7918f24d
NC		 2471 PERL_ARGS_ASSERT_GV_CHECK;
2472
9e5cda6b 2473 if (!SvOOK(stash))
8990e307 2474 return;
90754377 2475
9e5cda6b 2476 assert(HvARRAY(stash));
90754377 2477
a0d0e21e 2478 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2479 const HE *entry;
90754377 2480 /* mark stash is being scanned, to avoid recursing */
339441ef 2481 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2482 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2483 GV *gv;
b7787f18 2484 HV *hv;
e7acdfe9
DM		 2485 STRLEN keylen = HeKLEN(entry);
2486 const char * const key = HeKEY(entry);
2487
2488 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2489 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2490 {
90754377
DM		 2491 if (hv != PL_defstash && hv != stash
2492 && !(SvOOK(hv)
2493 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2494 )
a0d0e21e
LW		 2495 gv_check(hv); /* nested package */
2496 }
ecad31f0
BF		 2497 else if ( *HeKEY(entry) != '_'
2498 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2499 const char *file;
159b6efe 2500 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2501 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2502 continue;
1d7c1841 2503 file = GvFILE(gv);
1d7c1841 2504 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2505#ifdef USE_ITHREADS
2506 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2507#else
2508 CopFILEGV(PL_curcop)
2509 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2510#endif
9014280d 2511 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2512 "Name \"%"HEKf"::%"HEKf
2513 "\" used only once: possible typo",
2514 HEKfARG(HvNAME_HEK(stash)),
2515 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2516 }
79072805 2517 }
339441ef 2518 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2519 }
2520}
2521
2522GV *
9cc50d5b 2523Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2524{
9cc50d5b 2525 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2526 assert(!(flags & ~SVf_UTF8));
7918f24d 2527
b17a0679
FC		 2528 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2529 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2530 (long)PL_gensym++),
2531 GV_ADD, SVt_PVGV);
79072805
LW		 2532}
2533
2534/* hopefully this is only called on local symbol table entries */
2535
2536GP*
864dbfa3 2537Perl_gp_ref(pTHX_ GP *gp)
79072805 2538{
1d7c1841 2539 if (!gp)
d4c19fe8 2540 return NULL;
79072805 2541 gp->gp_refcnt++;
44a8e56a 2542 if (gp->gp_cv) {
2543 if (gp->gp_cvgen) {
e1a479c5
BB		 2544 /* If the GP they asked for a reference to contains
2545 a method cache entry, clear it first, so that we
2546 don't infect them with our cached entry */
e7881358 2547 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2548 gp->gp_cv = NULL;
44a8e56a 2549 gp->gp_cvgen = 0;
2550 }
44a8e56a 2551 }
79072805 2552 return gp;
79072805
LW		 2553}
2554
2555void
864dbfa3 2556Perl_gp_free(pTHX_ GV *gv)
79072805 2557{
79072805 2558 GP* gp;
b0d55c99 2559 int attempts = 100;
79072805 2560
f7877b28 2561 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2562 return;
f248d071 2563 if (gp->gp_refcnt == 0) {
9b387841
NC		 2564 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2565 "Attempt to free unreferenced glob pointers"
2566 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2567 return;
2568 }
4571f4a7 2569 if (gp->gp_refcnt > 1) {
bc81b34d 2570 borrowed:
748a9306
LW		 2571 if (gp->gp_egv == gv)
2572 gp->gp_egv = 0;
4571f4a7 2573 gp->gp_refcnt--;
c43ae56f 2574 GvGP_set(gv, NULL);
79072805 2575 return;
748a9306 2576 }
79072805 2577
b0d55c99
FC		 2578 while (1) {
2579 /* Copy and null out all the glob slots, so destructors do not see
2580 freed SVs. */
2581 HEK * const file_hek = gp->gp_file_hek;
2582 SV * const sv = gp->gp_sv;
2583 AV * const av = gp->gp_av;
2584 HV * const hv = gp->gp_hv;
2585 IO * const io = gp->gp_io;
2586 CV * const cv = gp->gp_cv;
2587 CV * const form = gp->gp_form;
2588
2589 gp->gp_file_hek = NULL;
2590 gp->gp_sv = NULL;
2591 gp->gp_av = NULL;
2592 gp->gp_hv = NULL;
2593 gp->gp_io = NULL;
2594 gp->gp_cv = NULL;
2595 gp->gp_form = NULL;
2596
2597 if (file_hek)
2598 unshare_hek(file_hek);
2599
2600 SvREFCNT_dec(sv);
2601 SvREFCNT_dec(av);
2602 /* FIXME - another reference loop GV -> symtab -> GV ?
2603 Somehow gp->gp_hv can end up pointing at freed garbage. */
2604 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2605 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2606 if (PL_stashcache && hvname_hek) {
2607 DEBUG_o(Perl_deb(aTHX_
2608 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2609 HEKfARG(hvname_hek)));
0ca9877d 2610 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2611 }
b0d55c99
FC		 2612 SvREFCNT_dec(hv);
2613 }
96d7c888
FC		 2614 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2615 && (IoTYPE(io) == IoTYPE_WRONLY ||
2616 IoTYPE(io) == IoTYPE_RDWR ||
2617 IoTYPE(io) == IoTYPE_APPEND)
2618 && ckWARN_d(WARN_IO)
2619 && IoIFP(io) != PerlIO_stdin()
2620 && IoIFP(io) != PerlIO_stdout()
2621 && IoIFP(io) != PerlIO_stderr()
2622 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2623 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2624 SvREFCNT_dec(io);
2625 SvREFCNT_dec(cv);
2626 SvREFCNT_dec(form);
2627
bc81b34d
FC		 2628 /* Possibly reallocated by a destructor */
2629 gp = GvGP(gv);
2630
b0d55c99
FC		 2631 if (!gp->gp_file_hek
2632 && !gp->gp_sv
2633 && !gp->gp_av
2634 && !gp->gp_hv
2635 && !gp->gp_io
2636 && !gp->gp_cv
2637 && !gp->gp_form) break;
2638
2639 if (--attempts == 0) {
2640 Perl_die(aTHX_
2641 "panic: gp_free failed to free glob pointer - "
2642 "something is repeatedly re-creating entries"
2643 );
2644 }
13207a71 2645 }
748a9306 2646
bc81b34d
FC		 2647 /* Possibly incremented by a destructor doing glob assignment */
2648 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2649 Safefree(gp);
c43ae56f 2650 GvGP_set(gv, NULL);
79072805
LW		 2651}
2652
d460ef45
NIS		 2653int
2654Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2655{
53c1dcc0
AL		 2656 AMT * const amtp = (AMT*)mg->mg_ptr;
2657 PERL_UNUSED_ARG(sv);
dd374669 2658
7918f24d
NC		 2659 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2660
d460ef45
NIS		 2661 if (amtp && AMT_AMAGIC(amtp)) {
2662 int i;
2663 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2664 CV * const cv = amtp->table[i];
b37c2d43 2665 if (cv) {
e7881358 2666 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2667 amtp->table[i] = NULL;
d460ef45
NIS		 2668 }
2669 }
2670 }
2671 return 0;
2672}
2673
a0d0e21e 2674/* Updates and caches the CV's */
c3a9a790
RGS		 2675/* Returns:
2676 * 1 on success and there is some overload
2677 * 0 if there is no overload
2678 * -1 if some error occurred and it couldn't croak
2679 */
a0d0e21e 2680
c3a9a790 2681int
242f8760 2682Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2683{
ad64d0ec 2684 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2685 AMT amt;
9b439311 2686 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2687 U32 newgen;
a0d0e21e 2688
7918f24d
NC		 2689 PERL_ARGS_ASSERT_GV_AMUPDATE;
2690
9b439311 2691 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2692 if (mg) {
2693 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2694 if (amtp->was_ok_sub == newgen) {
8c34e50d 2695 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2696 }
ad64d0ec 2697 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2698 }
a0d0e21e 2699
bfcb3514 2700 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2701
d460ef45 2702 Zero(&amt,1,AMT);
e1a479c5 2703 amt.was_ok_sub = newgen;
a6006777 2704 amt.fallback = AMGfallNO;
2705 amt.flags = 0;
2706
a6006777 2707 {
8c34e50d
FC		 2708 int filled = 0;
2709 int i;
3d147ac2
DM		 2710 bool deref_seen = 0;
2711
a6006777 2712
3866ea3b 2713 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2714
89ffc314 2715 /* Try to find via inheritance. */
e6919483 2716 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2717 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2718 CV* cv;
89ffc314
IZ		 2719
2720 if (!gv)
3866ea3b
FC		 2721 {
2722 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2723 goto no_table;
3866ea3b
FC		 2724 }
2725#ifdef PERL_DONT_CREATE_GVSV
2726 else if (!sv) {
6f207bd3 2727 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2728 }
2729#endif
79c9643d
JL		 2730 else if (SvTRUE(sv))
2731 /* don't need to set overloading here because fallback => 1
2732 * is the default setting for classes without overloading */
89ffc314 2733 amt.fallback=AMGfallYES;
79c9643d
JL		 2734 else if (SvOK(sv)) {
2735 amt.fallback=AMGfallNEVER;
386a5489 2736 filled = 1;
386a5489 2737 }
79c9643d 2738 else {
386a5489 2739 filled = 1;
386a5489 2740 }
a6006777 2741
3d147ac2 2742 assert(SvOOK(stash));
3d147ac2 2743 /* initially assume the worst */
339441ef 2744 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2745
8c34e50d 2746 for (i = 1; i < NofAMmeth; i++) {
6136c704 2747 const char * const cooky = PL_AMG_names[i];
32251b26 2748 /* Human-readable form, for debugging: */
8c34e50d 2749 const char * const cp = AMG_id2name(i);
d279ab82 2750 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2751
a0288114 2752 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2753 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2754 /* don't fill the cache while looking up!
2755 Creation of inheritance stubs in intermediate packages may
2756 conflict with the logic of runtime method substitution.
2757 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2758 then we could have created stubs for "(+0" in A and C too.
2759 But if B overloads "bool", we may want to use it for
2760 numifying instead of C's "+0". */
8c34e50d 2761 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2762 cv = 0;
c3ad4e54
FC		 2763 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2764 const HEK * const gvhek =
2765 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2766 const HEK * const stashek =
2767 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2768 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2769 && stashek && HEK_LEN(stashek) == 8
2770 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2771 /* This is a hack to support autoloading..., while
2772 knowing *which* methods were declared as overloaded. */
44a8e56a 2773 /* GvSV contains the name of the method. */
6136c704 2774 GV *ngv = NULL;
c69033f2 2775 SV *gvsv = GvSV(gv);
a0288114
AL		 2776
2777 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2778 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2779 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2780 if (!gvsv || !SvPOK(gvsv)
7f415459 2781 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2782 {
a0288114 2783 /* Can be an import stub (created by "can"). */
242f8760 2784 if (destructing) {
c3a9a790 2785 return -1;
242f8760
RGS		 2786 }
2787 else {
d66cca07
BF		 2788 const SV * const name = (gvsv && SvPOK(gvsv))
2789 ? gvsv
2790 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2791 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2792 Perl_croak(aTHX_ "%s method \"%"SVf256
2793 "\" overloading \"%s\" "\
d0c0e7dd 2794 "in package \"%"HEKf256"\"",
242f8760
RGS		 2795 (GvCVGEN(gv) ? "Stub found while resolving"
2796 : "Can't resolve"),
d66cca07 2797 SVfARG(name), cp,
d0c0e7dd 2798 HEKfARG(
d66cca07 2799 HvNAME_HEK(stash)
d0c0e7dd 2800 ));
242f8760 2801 }
44a8e56a 2802 }
dc848c6f 2803 cv = GvCV(gv = ngv);
44a8e56a 2804 }
b464bac0 2805 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2806 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2807 GvNAME(CvGV(cv))) );
2808 filled = 1;
611c1e95 2809 } else if (gv) { /* Autoloaded... */
ea726b52 2810 cv = MUTABLE_CV(gv);
611c1e95 2811 filled = 1;
44a8e56a 2812 }
ea726b52 2813 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2814
2815 if (gv) {
2816 switch (i) {
2817 case to_sv_amg:
2818 case to_av_amg:
2819 case to_hv_amg:
2820 case to_gv_amg:
2821 case to_cv_amg:
2822 case nomethod_amg:
2823 deref_seen = 1;
2824 break;
2825 }
2826 }
a0d0e21e 2827 }
3d147ac2 2828 if (!deref_seen)
45479970
DM		 2829 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2830 * NB - aux var invalid here, HvARRAY() could have been
2831 * reallocated since it was assigned to */
2832 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2833
a0d0e21e 2834 if (filled) {
a6006777 2835 AMT_AMAGIC_on(&amt);
ad64d0ec 2836 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2837 (char*)&amt, sizeof(AMT));
8c34e50d 2838 return TRUE;
a0d0e21e
LW		 2839 }
2840 }
a6006777 2841 /* Here we have no table: */
8c34e50d 2842 no_table:
a6006777 2843 AMT_AMAGIC_off(&amt);
ad64d0ec 2844 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2845 (char*)&amt, sizeof(AMTS));
c3a9a790 2846 return 0;
a0d0e21e
LW		 2847}
2848
32251b26
IZ		 2849
2850CV*
2851Perl_gv_handler(pTHX_ HV *stash, I32 id)
2852{
3f8f4626 2853 MAGIC *mg;
32251b26 2854 AMT *amtp;
e1a479c5 2855 U32 newgen;
9b439311 2856 struct mro_meta* stash_meta;
32251b26 2857
bfcb3514 2858 if (!stash || !HvNAME_get(stash))
601f1833 2859 return NULL;
e1a479c5 2860
9b439311
BB		 2861 stash_meta = HvMROMETA(stash);
2862 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2863
ad64d0ec 2864 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2865 if (!mg) {
2866 do_update:
8c34e50d 2867 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2868 return NULL;
ad64d0ec 2869 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2870 }
a9fd4e40 2871 assert(mg);
32251b26 2872 amtp = (AMT*)mg->mg_ptr;
66978156 2873 if ( amtp->was_ok_sub != newgen )
32251b26 2874 goto do_update;
3ad83ce7 2875 if (AMT_AMAGIC(amtp)) {
b7787f18 2876 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2877 if (ret && isGV(ret)) { /* Autoloading stab */
2878 /* Passing it through may have resulted in a warning
2879 "Inherited AUTOLOAD for a non-method deprecated", since
2880 our caller is going through a function call, not a method call.
2881 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2882 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2883
2884 if (gv && GvCV(gv))
2885 return GvCV(gv);
2886 }
2887 return ret;
2888 }
a0288114 2889
601f1833 2890 return NULL;
32251b26
IZ		 2891}
2892
2893
6f1401dc
DM		 2894/* Implement tryAMAGICun_MG macro.
2895 Do get magic, then see if the stack arg is overloaded and if so call it.
2896 Flags:
2897 AMGf_set return the arg using SETs rather than assigning to
2898 the targ
2899 AMGf_numeric apply sv_2num to the stack arg.
2900*/
2901
2902bool
2903Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2904 dSP;
2905 SV* tmpsv;
2906 SV* const arg = TOPs;
2907
2908 SvGETMAGIC(arg);
2909
9f8bf298 2910 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2911 AMGf_noright | AMGf_unary
2912 | (flags & AMGf_numarg))))
2913 {
6f1401dc
DM		 2914 if (flags & AMGf_set) {
2915 SETs(tmpsv);
2916 }
2917 else {
2918 dTARGET;
2919 if (SvPADMY(TARG)) {
2920 sv_setsv(TARG, tmpsv);
2921 SETTARG;
2922 }
2923 else
2924 SETs(tmpsv);
2925 }
2926 PUTBACK;
2927 return TRUE;
2928 }
2929
2930 if ((flags & AMGf_numeric) && SvROK(arg))
2931 *sp = sv_2num(arg);
2932 return FALSE;
2933}
2934
2935
2936/* Implement tryAMAGICbin_MG macro.
2937 Do get magic, then see if the two stack args are overloaded and if so
2938 call it.
2939 Flags:
2940 AMGf_set return the arg using SETs rather than assigning to
2941 the targ
2942 AMGf_assign op may be called as mutator (eg +=)
2943 AMGf_numeric apply sv_2num to the stack arg.
2944*/
2945
2946bool
2947Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2948 dSP;
2949 SV* const left = TOPm1s;
2950 SV* const right = TOPs;
2951
2952 SvGETMAGIC(left);
2953 if (left != right)
2954 SvGETMAGIC(right);
2955
2956 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2957 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC		 2958 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2959 | (flags & AMGf_numarg));
6f1401dc
DM		 2960 if (tmpsv) {
2961 if (flags & AMGf_set) {
2962 (void)POPs;
2963 SETs(tmpsv);
2964 }
2965 else {
2966 dATARGET;
2967 (void)POPs;
2968 if (opASSIGN || SvPADMY(TARG)) {
2969 sv_setsv(TARG, tmpsv);
2970 SETTARG;
2971 }
2972 else
2973 SETs(tmpsv);
2974 }
2975 PUTBACK;
2976 return TRUE;
2977 }
2978 }
75ea7a12
FC		 2979 if(left==right && SvGMAGICAL(left)) {
2980 SV * const left = sv_newmortal();
2981 *(sp-1) = left;
2982 /* Print the uninitialized warning now, so it includes the vari-
2983 able name. */
2984 if (!SvOK(right)) {
2985 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2986 sv_setsv_flags(left, &PL_sv_no, 0);
2987 }
2988 else sv_setsv_flags(left, right, 0);
2989 SvGETMAGIC(right);
2990 }
6f1401dc 2991 if (flags & AMGf_numeric) {
75ea7a12
FC		 2992 if (SvROK(TOPm1s))
2993 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2994 if (SvROK(right))
2995 *sp = sv_2num(right);
2996 }
2997 return FALSE;
2998}
2999
25a9ffce
NC		 3000SV *
3001Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
3002 SV *tmpsv = NULL;
3d147ac2 3003 HV *stash;
25a9ffce
NC		 3004
3005 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
3006
3d147ac2
DM		 3007 if (!SvAMAGIC(ref))
3008 return ref;
3009 /* return quickly if none of the deref ops are overloaded */
3010 stash = SvSTASH(SvRV(ref));
3011 assert(SvOOK(stash));
3012 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
3013 return ref;
3014
3015 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 3016 AMGf_noright | AMGf_unary))) {
3017 if (!SvROK(tmpsv))
3018 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
3019 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
3020 /* Bail out if it returns us the same reference. */
3021 return tmpsv;
3022 }
3023 ref = tmpsv;
3d147ac2
DM		 3024 if (!SvAMAGIC(ref))
3025 break;
25a9ffce
NC		 3026 }
3027 return tmpsv ? tmpsv : ref;
3028}
6f1401dc 3029
8d569291
FC		 3030bool
3031Perl_amagic_is_enabled(pTHX_ int method)
3032{
3033 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
3034
3035 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
3036
3037 if ( !lex_mask || !SvOK(lex_mask) )
3038 /* overloading lexically disabled */
3039 return FALSE;
3040 else if ( lex_mask && SvPOK(lex_mask) ) {
3041 /* we have an entry in the hints hash, check if method has been
3042 * masked by overloading.pm */
3043 STRLEN len;
3044 const int offset = method / 8;
3045 const int bit = method % 8;
3046 char *pv = SvPV(lex_mask, len);
3047
3048 /* Bit set, so this overloading operator is disabled */
3049 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
3050 return FALSE;
3051 }
3052 return TRUE;
3053}
3054
a0d0e21e 3055SV*
864dbfa3 3056Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3057{
27da23d5 3058 dVAR;
b267980d 3059 MAGIC *mg;
9c5ffd7c 3060 CV *cv=NULL;
a0d0e21e 3061 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3062 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3063 int off = 0, off1, lr = 0, notfound = 0;
3064 int postpr = 0, force_cpy = 0;
3065 int assign = AMGf_assign & flags;
3066 const int assignshift = assign ? 1 : 0;
bf5522a1 3067 int use_default_op = 0;
67288365 3068 int force_scalar = 0;
497b47a8
JH		 3069#ifdef DEBUGGING
3070 int fl=0;
497b47a8 3071#endif
25716404 3072 HV* stash=NULL;
7918f24d
NC		 3073
3074 PERL_ARGS_ASSERT_AMAGIC_CALL;
3075
e46c382e 3076 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3077 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3078 }
3079
a0d0e21e 3080 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3081 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3082 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3083 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3084 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3085 : NULL))
b267980d 3086 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3087 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3088 * usual method */
497b47a8
JH		 3089 (
3090#ifdef DEBUGGING
3091 fl = 1,
a0288114 3092#endif
497b47a8 3093 cv = cvp[off=method])))) {
a0d0e21e
LW		 3094 lr = -1; /* Call method for left argument */
3095 } else {
3096 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3097 int logic;
3098
3099 /* look for substituted methods */
ee239bfe 3100 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3101 switch (method) {
3102 case inc_amg:
ee239bfe
IZ		 3103 force_cpy = 1;
3104 if ((cv = cvp[off=add_ass_amg])
3105 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3106 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3107 }
3108 break;
3109 case dec_amg:
ee239bfe
IZ		 3110 force_cpy = 1;
3111 if ((cv = cvp[off = subtr_ass_amg])
3112 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3113 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3114 }
3115 break;
3116 case bool__amg:
3117 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3118 break;
3119 case numer_amg:
3120 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3121 break;
3122 case string_amg:
3123 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3124 break;
b7787f18
AL		 3125 case not_amg:
3126 (void)((cv = cvp[off=bool__amg])
3127 || (cv = cvp[off=numer_amg])
3128 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3129 if (cv)
3130 postpr = 1;
b7787f18 3131 break;
748a9306
LW		 3132 case copy_amg:
3133 {
76e3520e
GS		 3134 /*
3135 * SV* ref causes confusion with the interpreter variable of
3136 * the same name
3137 */
890ce7af 3138 SV* const tmpRef=SvRV(left);
76e3520e 3139 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3140 /*
3141 * Just to be extra cautious. Maybe in some
3142 * additional cases sv_setsv is safe, too.
3143 */
890ce7af 3144 SV* const newref = newSVsv(tmpRef);
748a9306 3145 SvOBJECT_on(newref);
a1cd65be
FC		 3146 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3147 delegate to the stash. */
85fbaab2 3148 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3149 return newref;
3150 }
3151 }
3152 break;
a0d0e21e 3153 case abs_amg:
b267980d 3154 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3155 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3156 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3157 if (off1==lt_amg) {
890ce7af 3158 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3159 lt_amg,AMGf_noright);
3160 logic = SvTRUE(lessp);
3161 } else {
890ce7af 3162 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3163 ncmp_amg,AMGf_noright);
3164 logic = (SvNV(lessp) < 0);
3165 }
3166 if (logic) {
3167 if (off==subtr_amg) {
3168 right = left;
748a9306 3169 left = nullsv;
a0d0e21e
LW		 3170 lr = 1;
3171 }
3172 } else {
3173 return left;
3174 }
3175 }
3176 break;
3177 case neg_amg:
155aba94 3178 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3179 right = left;
3180 left = sv_2mortal(newSViv(0));
3181 lr = 1;
3182 }
3183 break;
f216259d 3184 case int_amg:
f5284f61 3185 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3186 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3187 case regexp_amg:
b267980d
NIS		 3188 /* FAIL safe */
3189 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3190
f5284f61
IZ		 3191 case to_sv_amg:
3192 case to_av_amg:
3193 case to_hv_amg:
3194 case to_gv_amg:
3195 case to_cv_amg:
3196 /* FAIL safe */
b267980d 3197 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3198
a0d0e21e
LW		 3199 default:
3200 goto not_found;
3201 }
3202 if (!cv) goto not_found;
3203 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3204 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3205 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3206 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3207 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3208 : NULL))
69815d08
RS		 3209 && (cv = cvp[off=method])) { /* Method for right
3210 * argument found */
3211 lr=1;
bf5522a1
MB		 3212 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3213 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3214 && !(flags & AMGf_unary)) {
3215 /* We look for substitution for
3216 * comparison operations and
fc36a67e 3217 * concatenation */
a0d0e21e
LW		 3218 if (method==concat_amg || method==concat_ass_amg
3219 || method==repeat_amg || method==repeat_ass_amg) {
3220 return NULL; /* Delegate operation to string conversion */
3221 }
3222 off = -1;
3223 switch (method) {
3224 case lt_amg:
3225 case le_amg:
3226 case gt_amg:
3227 case ge_amg:
3228 case eq_amg:
3229 case ne_amg:
2ab54efd
MB		 3230 off = ncmp_amg;
3231 break;
a0d0e21e
LW		 3232 case slt_amg:
3233 case sle_amg:
3234 case sgt_amg:
3235 case sge_amg:
3236 case seq_amg:
3237 case sne_amg:
2ab54efd
MB		 3238 off = scmp_amg;
3239 break;
a0d0e21e 3240 }
bf5522a1
MB		 3241 if (off != -1) {
3242 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3243 cv = ocvp[off];
3244 lr = -1;
3245 }
3246 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3247 cv = cvp[off];
3248 lr = 1;
3249 }
3250 }
3251 if (cv)
2ab54efd
MB		 3252 postpr = 1;
3253 else
3254 goto not_found;
a0d0e21e 3255 } else {
a6006777 3256 not_found: /* No method found, either report or croak */
b267980d
NIS		 3257 switch (method) {
3258 case to_sv_amg:
3259 case to_av_amg:
3260 case to_hv_amg:
3261 case to_gv_amg:
3262 case to_cv_amg:
3263 /* FAIL safe */
3264 return left; /* Delegate operation to standard mechanisms. */
b267980d 3265 }
a0d0e21e
LW		 3266 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3267 notfound = 1; lr = -1;
3268 } else if (cvp && (cv=cvp[nomethod_amg])) {
3269 notfound = 1; lr = 1;
bf5522a1
MB		 3270 } else if ((use_default_op =
3271 (!ocvp || oamtp->fallback >= AMGfallYES)
3272 && (!cvp || amtp->fallback >= AMGfallYES))
3273 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3274 /* Skip generating the "no method found" message. */
3275 return NULL;
a0d0e21e 3276 } else {
46fc3d4c 3277 SV *msg;
774d564b 3278 if (off==-1) off=method;
b267980d 3279 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3280 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3281 AMG_id2name(method + assignshift),
3282 (flags & AMGf_unary ? " " : "\n\tleft "),
3283 SvAMAGIC(left)?
3284 "in overloaded package ":
3285 "has no overloaded magic",
3286 SvAMAGIC(left)?
3287 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3288 SVfARG(&PL_sv_no),
3289 SvAMAGIC(right)?
3290 ",\n\tright argument in overloaded package ":
3291 (flags & AMGf_unary
3292 ? ""
3293 : ",\n\tright argument has no overloaded magic"),
3294 SvAMAGIC(right)?
3295 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3296 SVfARG(&PL_sv_no)));
bf5522a1 3297 if (use_default_op) {
d66cca07 3298 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3299 } else {
be2597df 3300 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3301 }
3302 return NULL;
3303 }
ee239bfe 3304 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3305 }
3306 }
67288365
JL		 3307
3308 switch (method) {
3309 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3310 * operation. we need this to return a value, so that it can be assigned
3311 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3312 * increment or decrement was itself called in void context */
3313 case inc_amg:
3314 if (off == add_amg)
3315 force_scalar = 1;
3316 break;
3317 case dec_amg:
3318 if (off == subtr_amg)
3319 force_scalar = 1;
3320 break;
3321 /* in these cases, we're calling an assignment variant of an operator
3322 * (+= rather than +, for instance). regardless of whether it's a
3323 * fallback or not, it always has to return a value, which will be
3324 * assigned to the proper variable later */
3325 case add_amg:
3326 case subtr_amg:
3327 case mult_amg:
3328 case div_amg:
3329 case modulo_amg:
3330 case pow_amg:
3331 case lshift_amg:
3332 case rshift_amg:
3333 case repeat_amg:
3334 case concat_amg:
3335 case band_amg:
3336 case bor_amg:
3337 case bxor_amg:
6d06ecce
FC		 3338 case sband_amg:
3339 case sbor_amg:
3340 case sbxor_amg:
67288365
JL		 3341 if (assign)
3342 force_scalar = 1;
3343 break;
3344 /* the copy constructor always needs to return a value */
3345 case copy_amg:
3346 force_scalar = 1;
3347 break;
3348 /* because of the way these are implemented (they don't perform the
3349 * dereferencing themselves, they return a reference that perl then
3350 * dereferences later), they always have to be in scalar context */
3351 case to_sv_amg:
3352 case to_av_amg:
3353 case to_hv_amg:
3354 case to_gv_amg:
3355 case to_cv_amg:
3356 force_scalar = 1;
3357 break;
3358 /* these don't have an op of their own; they're triggered by their parent
3359 * op, so the context there isn't meaningful ('$a and foo()' in void
3360 * context still needs to pass scalar context on to $a's bool overload) */
3361 case bool__amg:
3362 case numer_amg:
3363 case string_amg:
3364 force_scalar = 1;
3365 break;
3366 }
3367
497b47a8 3368#ifdef DEBUGGING
a0d0e21e 3369 if (!notfound) {
497b47a8 3370 DEBUG_o(Perl_deb(aTHX_
d66cca07 3371 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3372 AMG_id2name(off),
3373 method+assignshift==off? "" :
a0288114 3374 " (initially \"",
497b47a8
JH		 3375 method+assignshift==off? "" :
3376 AMG_id2name(method+assignshift),
a0288114 3377 method+assignshift==off? "" : "\")",
497b47a8
JH		 3378 flags & AMGf_unary? "" :
3379 lr==1 ? " for right argument": " for left argument",
3380 flags & AMGf_unary? " for argument" : "",
d66cca07 3381 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3382 fl? ",\n\tassignment variant used": "") );
ee239bfe 3383 }
497b47a8 3384#endif
748a9306
LW		 3385 /* Since we use shallow copy during assignment, we need
3386 * to dublicate the contents, probably calling user-supplied
3387 * version of copy operator
3388 */
ee239bfe
IZ		 3389 /* We need to copy in following cases:
3390 * a) Assignment form was called.
3391 * assignshift==1, assign==T, method + 1 == off
3392 * b) Increment or decrement, called directly.
3393 * assignshift==0, assign==0, method + 0 == off
3394 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3395 * assignshift==0, assign==T,
ee239bfe
IZ		 3396 * force_cpy == T
3397 * d) Increment or decrement, translated to nomethod.
b267980d 3398 * assignshift==0, assign==0,
ee239bfe
IZ		 3399 * force_cpy == T
3400 * e) Assignment form translated to nomethod.
3401 * assignshift==1, assign==T, method + 1 != off
3402 * force_cpy == T
3403 */
3404 /* off is method, method+assignshift, or a result of opcode substitution.
3405 * In the latter case assignshift==0, so only notfound case is important.
3406 */
73512201 3407 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3408 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3409 || force_cpy) )
6f1401dc 3410 {
1b38c28e
NC		 3411 /* newSVsv does not behave as advertised, so we copy missing
3412 * information by hand */
3413 SV *tmpRef = SvRV(left);
3414 SV *rv_copy;
31d632c3 3415 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3416 SvRV_set(left, rv_copy);
3417 SvSETMAGIC(left);
e7881358 3418 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3419 }
6f1401dc
DM		 3420 }
3421
a0d0e21e
LW		 3422 {
3423 dSP;
3424 BINOP myop;
3425 SV* res;
b7787f18 3426 const bool oldcatch = CATCH_GET;
67288365 3427 I32 oldmark, nret;
1c23e2bd 3428 U8 gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3429
54310121 3430 CATCH_SET(TRUE);
a0d0e21e
LW		 3431 Zero(&myop, 1, BINOP);
3432 myop.op_last = (OP *) &myop;
b37c2d43 3433 myop.op_next = NULL;
67288365
JL		 3434 myop.op_flags = OPf_STACKED;
3435
3436 switch (gimme) {
3437 case G_VOID:
3438 myop.op_flags |= OPf_WANT_VOID;
3439 break;
3440 case G_ARRAY:
3441 if (flags & AMGf_want_list) {
3442 myop.op_flags |= OPf_WANT_LIST;
3443 break;
3444 }
3445 /* FALLTHROUGH */
3446 default:
3447 myop.op_flags |= OPf_WANT_SCALAR;
3448 break;
3449 }
a0d0e21e 3450
e788e7d3 3451 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3452 ENTER;
462e5cf6 3453 SAVEOP();
533c011a 3454 PL_op = (OP *) &myop;
3280af22 3455 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3456 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3457 Perl_pp_pushmark(aTHX);
a0d0e21e 3458
924508f0 3459 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3460 PUSHs(lr>0? right: left);
3461 PUSHs(lr>0? left: right);
3280af22 3462 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3463 if (notfound) {
59cd0e26
NC		 3464 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3465 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3466 }
636ac8fc
FC		 3467 else if (flags & AMGf_numarg)
3468 PUSHs(&PL_sv_undef);
3469 if (flags & AMGf_numarg)
3470 PUSHs(&PL_sv_yes);
ad64d0ec 3471 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3472 PUTBACK;
67288365 3473 oldmark = TOPMARK;
a0d0e21e 3474
139d0ce6 3475 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3476 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3477 LEAVE;
3478 SPAGAIN;
67288365
JL		 3479 nret = SP - (PL_stack_base + oldmark);
3480
3481 switch (gimme) {
3482 case G_VOID:
3483 /* returning NULL has another meaning, and we check the context
3484 * at the call site too, so this can be differentiated from the
3485 * scalar case */
3486 res = &PL_sv_undef;
3487 SP = PL_stack_base + oldmark;
3488 break;
3489 case G_ARRAY: {
3490 if (flags & AMGf_want_list) {
3491 res = sv_2mortal((SV *)newAV());
3492 av_extend((AV *)res, nret);
3493 while (nret--)
3494 av_store((AV *)res, nret, POPs);
3495 break;
3496 }
3497 /* FALLTHROUGH */
3498 }
3499 default:
3500 res = POPs;
3501 break;
3502 }
a0d0e21e 3503
ebafeae7 3504 PUTBACK;
d3acc0f7 3505 POPSTACK;
54310121 3506 CATCH_SET(oldcatch);
a0d0e21e 3507
a0d0e21e 3508 if (postpr) {
b7787f18 3509 int ans;
a0d0e21e
LW		 3510 switch (method) {
3511 case le_amg:
3512 case sle_amg:
3513 ans=SvIV(res)<=0; break;
3514 case lt_amg:
3515 case slt_amg:
3516 ans=SvIV(res)<0; break;
3517 case ge_amg:
3518 case sge_amg:
3519 ans=SvIV(res)>=0; break;
3520 case gt_amg:
3521 case sgt_amg:
3522 ans=SvIV(res)>0; break;
3523 case eq_amg:
3524 case seq_amg:
3525 ans=SvIV(res)==0; break;
3526 case ne_amg:
3527 case sne_amg:
3528 ans=SvIV(res)!=0; break;
3529 case inc_amg:
3530 case dec_amg:
bbce6d69 3531 SvSetSV(left,res); return left;
dc437b57 3532 case not_amg:
fe7ac86a 3533 ans=!SvTRUE(res); break;
b7787f18
AL		 3534 default:
3535 ans=0; break;
a0d0e21e 3536 }
54310121 3537 return boolSV(ans);
748a9306
LW		 3538 } else if (method==copy_amg) {
3539 if (!SvROK(res)) {
cea2e8a9 3540 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3541 }
3542 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3543 } else {
3544 return res;
3545 }
3546 }
3547}
c9d5ac95 3548
f5c1e807
NC		 3549void
3550Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3551{
3552 dVAR;
acda4c6a 3553 U32 hash;
f5c1e807 3554
7918f24d 3555 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3556
acda4c6a
NC		 3557 if (len > I32_MAX)
3558 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3559
ae8cc45f
NC		 3560 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3561 unshare_hek(GvNAME_HEK(gv));
3562 }
3563
acda4c6a 3564 PERL_HASH(hash, name, len);
c60dbbc3 3565 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3566}
3567
66610fdd 3568/*
f7461760
Z		 3569=for apidoc gv_try_downgrade
3570
2867cdbc
Z		 3571If the typeglob C<gv> can be expressed more succinctly, by having
3572something other than a real GV in its place in the stash, replace it
3573with the optimised form. Basic requirements for this are that C<gv>
3574is a real typeglob, is sufficiently ordinary, and is only referenced
3575from its package. This function is meant to be used when a GV has been
3576looked up in part to see what was there, causing upgrading, but based
3577on what was found it turns out that the real GV isn't required after all.
3578
3579If C<gv> is a completely empty typeglob, it is deleted from the stash.
3580
3581If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3582sub, the typeglob is replaced with a scalar-reference placeholder that
3583more compactly represents the same thing.
f7461760
Z		 3584
3585=cut
3586*/
3587
3588void
3589Perl_gv_try_downgrade(pTHX_ GV *gv)
3590{
3591 HV *stash;
3592 CV *cv;
3593 HEK *namehek;
3594 SV **gvp;
3595 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3596
3597 /* XXX Why and where does this leave dangling pointers during global
3598 destruction? */
627364f1 3599 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3600
2867cdbc 3601 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3602 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3603 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3604 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3605 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3606 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3607 return;
2be08ad1
FC		 3608 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3609 return;
803f2748
DM		 3610 if (SvMAGICAL(gv)) {
3611 MAGIC *mg;
3612 /* only backref magic is allowed */
3613 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3614 return;
3615 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3616 if (mg->mg_type != PERL_MAGIC_backref)
3617 return;
3618 }
3619 }
2867cdbc
Z		 3620 cv = GvCV(gv);
3621 if (!cv) {
3622 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3623 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3624 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3625 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3626 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3627 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3628 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3629 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3630 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3631 *gvp == (SV*)gv) {
3632 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3633 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3634 SvREFCNT(gv) = 0;
3635 sv_clear((SV*)gv);
3636 SvREFCNT(gv) = 1;
70e5f2b5 3637 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3638
3639 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3640 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3641 STRUCT_OFFSET(XPVIV, xiv_iv));
3642 SvRV_set(gv, value);
3643 }
3644}
3645
9e3fb20c
FC		 3646GV *
3647Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3648{
3649 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3650 GV * const *gvp;
3651 PERL_ARGS_ASSERT_GV_OVERRIDE;
3652 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3653 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3654 gv = gvp ? *gvp : NULL;
3655 if (gv && !isGV(gv)) {
3656 if (!SvPCS_IMPORTED(gv)) return NULL;
3657 gv_init(gv, PL_globalstash, name, len, 0);
3658 return gv;
3659 }
3660 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3661}
3662
4aaa4757
FC		 3663#include "XSUB.h"
3664
3665static void
3666core_xsub(pTHX_ CV* cv)
3667{
3668 Perl_croak(aTHX_
3669 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3670 );
3671}
3672
f7461760 3673/*
14d04a33 3674 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3675 */
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