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util.c: Allow C backtrace to compile under threads
[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),
147e3846 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 1006GV *
44130a26 1007Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1008{
65308f87
YO		 1009 const char * const origname = name;
1010 const char * const name_end = name + len;
e2cace1e 1011 const char *last_separator = NULL;
a0d0e21e 1012 GV* gv;
0dae17bd 1013 HV* ostash = stash;
ad64d0ec 1014 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1015 const U32 autoload = flags & GV_AUTOLOAD;
1016 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1017 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1018
44130a26 1019 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1020
eff494dd 1021 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1022 stash = NULL;
c9bf4021 1023 else {
e2cace1e 1024 /* The only way stash can become NULL later on is if last_separator is set,
c9bf4021
NC		 1025 which in turn means that there is no need for a SVt_PVHV case
1026 the error reporting code. */
1027 }
b267980d 1028
cfb73676
YO		 1029 {
1030 /* check if the method name is fully qualified or
1031 * not, and separate the package name from the actual
1032 * method name.
1033 *
1034 * leaves last_separator pointing to the beginning of the
1035 * last package separator (either ' or ::) or 0
1036 * if none was found.
1037 *
1038 * leaves name pointing at the beginning of the
1039 * method name.
1040 */
1041 const char *name_cursor = name;
1042 const char * const name_em1 = name_end - 1; /* name_end minus 1 */
1043 for (name_cursor = name; name_cursor < name_end ; name_cursor++) {
1044 if (*name_cursor == '\'') {
1045 last_separator = name_cursor;
1046 name = name_cursor + 1;
1047 }
1048 else if (name_cursor < name_em1 && *name_cursor == ':' && name_cursor[1] == ':') {
1049 last_separator = name_cursor++;
1050 name = name_cursor + 1;
1051 }
1052 }
a0d0e21e 1053 }
cfb73676
YO		 1054
1055 /* did we find a separator? */
e2cace1e 1056 if (last_separator) {
9b7f107c
YO		 1057 STRLEN sep_len= last_separator - origname;
1058 if ( memEQs(origname, sep_len, "SUPER")) {
9607fc9c 1059 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1060 stash = CopSTASH(PL_curcop);
1061 flags |= GV_SUPER;
cea2e8a9 1062 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1063 origname, HvENAME_get(stash), name) );
4633a7c4 1064 }
9b7f107c
YO		 1065 else if ( sep_len >= 7 &&
1066 strEQs(last_separator - 7, "::SUPER")) {
aae43805 1067 /* don't autovifify if ->NoSuchStash::SUPER::method */
9b7f107c 1068 stash = gv_stashpvn(origname, sep_len - 7, is_utf8);
aae43805
FC		 1069 if (stash) flags |= GV_SUPER;
1070 }
e189a56d 1071 else {
af09ea45 1072 /* don't autovifify if ->NoSuchStash::method */
9b7f107c 1073 stash = gv_stashpvn(origname, sep_len, is_utf8);
e189a56d 1074 }
0dae17bd 1075 ostash = stash;
4633a7c4
LW		 1076 }
1077
65308f87 1078 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
a0d0e21e 1079 if (!gv) {
7da9d78d
AB		 1080 /* This is the special case that exempts Foo->import and
1081 Foo->unimport from being an error even if there's no
1082 import/unimport subroutine */
2f6e0fe7 1083 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1084 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1085 else if (autoload)
c8416c26 1086 gv = gv_autoload_pvn(
65308f87 1087 ostash, name, name_end - name, GV_AUTOLOAD_ISMETHOD|flags
c8416c26 1088 );
256d1bb2
NC		 1089 if (!gv && do_croak) {
1090 /* Right now this is exclusively for the benefit of S_method_common
1091 in pp_hot.c */
1092 if (stash) {
15e6cdd9
DG		 1093 /* If we can't find an IO::File method, it might be a call on
1094 * a filehandle. If IO:File has not been loaded, try to
1095 * require it first instead of croaking */
1096 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1097 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1098 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1099 STR_WITH_LEN("IO/File.pm"), 0,
1100 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1101 ) {
31b05a0f 1102 require_pv("IO/File.pm");
65308f87 1103 gv = gv_fetchmeth_pvn(stash, name, name_end - name, 0, flags);
15e6cdd9
DG		 1104 if (gv)
1105 return gv;
1106 }
256d1bb2 1107 Perl_croak(aTHX_
147e3846
KW		 1108 "Can't locate object method \"%" UTF8f
1109 "\" via package \"%" HEKf "\"",
65308f87 1110 UTF8fARG(is_utf8, name_end - name, name),
d0c0e7dd 1111 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1112 }
1113 else {
ecad31f0 1114 SV* packnamesv;
256d1bb2 1115
e2cace1e
YO		 1116 if (last_separator) {
1117 packnamesv = newSVpvn_flags(origname, last_separator - origname,
ecad31f0 1118 SVs_TEMP | is_utf8);
256d1bb2 1119 } else {
017c5e4e 1120 packnamesv = error_report;
256d1bb2
NC		 1121 }
1122
1123 Perl_croak(aTHX_
147e3846
KW		 1124 "Can't locate object method \"%" UTF8f
1125 "\" via package \"%" SVf "\""
1126 " (perhaps you forgot to load \"%" SVf "\"?)",
65308f87 1127 UTF8fARG(is_utf8, name_end - name, name),
ecad31f0 1128 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1129 }
1130 }
463ee0b2 1131 }
dc848c6f 1132 else if (autoload) {
9d4ba2ae 1133 CV* const cv = GvCV(gv);
09280a33
CS		 1134 if (!CvROOT(cv) && !CvXSUB(cv)) {
1135 GV* stubgv;
1136 GV* autogv;
1137
0c028dca 1138 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1139 stubgv = gv;
1140 else {
1141 stubgv = CvGV(cv);
1142 if (GvCV(stubgv) != cv) /* orphaned import */
1143 stubgv = gv;
1144 }
c8416c26
BF		 1145 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1146 GvNAME(stubgv), GvNAMELEN(stubgv),
1147 GV_AUTOLOAD_ISMETHOD
1148 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1149 if (autogv)
1150 gv = autogv;
1151 }
1152 }
44a8e56a 1153
1154 return gv;
1155}
1156
1157GV*
0eeb01b9 1158Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1159{
1160 char *namepv;
1161 STRLEN namelen;
0fe84f7c 1162 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1163 namepv = SvPV(namesv, namelen);
1164 if (SvUTF8(namesv))
1165 flags |= SVf_UTF8;
0eeb01b9 1166 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1167}
1168
1169GV*
0eeb01b9 1170Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1171{
0fe84f7c 1172 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1173 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1174}
1175
1176GV*
0eeb01b9 1177Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1178{
44a8e56a 1179 GV* gv;
1180 CV* cv;
1181 HV* varstash;
1182 GV* vargv;
1183 SV* varsv;
c8416c26
BF		 1184 SV *packname = NULL;
1185 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1186
0fe84f7c 1187 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1188
7edbdc6b 1189 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1190 return NULL;
0dae17bd
GS		 1191 if (stash) {
1192 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1193 STRLEN packname_len = 0;
1194 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1195 packname = newSVpvn_flags(packname_ptr, packname_len,
1196 SVs_TEMP | SvUTF8(stash));
5c284bb0 1197 stash = NULL;
0dae17bd 1198 }
c8416c26
BF		 1199 else
1200 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1201 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1202 }
257dc59d
FC		 1203 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1204 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1205 return NULL;
dc848c6f 1206 cv = GvCV(gv);
1207
adb5a9ae 1208 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1209 return NULL;
ed850460 1210
dc848c6f 1211 /*
1212 * Inheriting AUTOLOAD for non-methods works ... for now.
1213 */
0eeb01b9
FC		 1214 if (
1215 !(flags & GV_AUTOLOAD_ISMETHOD)
1216 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1217 )
d1d15184 1218 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
147e3846 1219 "Use of inherited AUTOLOAD for non-method %" SVf
d9d53e86
A		 1220 "::%" UTF8f "() is deprecated. This will be "
1221 "fatal in Perl 5.28",
ecad31f0 1222 SVfARG(packname),
b17a0679 1223 UTF8fARG(is_utf8, len, name));
44a8e56a 1224
aed2304a 1225 if (CvISXSUB(cv)) {
bb619f37
FC		 1226 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1227 * and split that value on the last '::', pass along the same data
1228 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1229 *
1230 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1231 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1232 * type. Since SvPVX has been documented as returning the sub name
1233 * for a long time, but not as returning the prototype, we have
1234 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1235 * elsewhere.
1236 *
1237 * We put the prototype in the same allocated buffer, but after
1238 * the sub name. The SvPOK flag indicates the presence of a proto-
1239 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1240 * If both flags are on, then SvLEN is used to indicate the end of
1241 * the prototype (artificially lower than what is actually allo-
1242 * cated), at the risk of having to reallocate a few bytes unneces-
1243 * sarily--but that should happen very rarely, if ever.
1244 *
1245 * We use SvUTF8 for both prototypes and sub names, so if one is
1246 * UTF8, the other must be upgraded.
adb5a9ae 1247 */
c68d9564 1248 CvSTASH_set(cv, stash);
8fa6a409 1249 if (SvPOK(cv)) { /* Ouch! */
e7881358 1250 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1251 STRLEN ulen;
1252 const char *proto = CvPROTO(cv);
1253 assert(proto);
1254 if (SvUTF8(cv))
1255 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1256 ulen = SvCUR(tmpsv);
1257 SvCUR(tmpsv)++; /* include null in string */
1258 sv_catpvn_flags(
1259 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1260 );
1261 SvTEMP_on(tmpsv); /* Allow theft */
1262 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1263 SvTEMP_off(tmpsv);
e7881358 1264 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1265 SvLEN(cv) = SvCUR(cv) + 1;
1266 SvCUR(cv) = ulen;
1267 }
1268 else {
1269 sv_setpvn((SV *)cv, name, len);
1270 SvPOK_off(cv);
1271 if (is_utf8)
c8416c26 1272 SvUTF8_on(cv);
8fa6a409
FC		 1273 else SvUTF8_off(cv);
1274 }
1275 CvAUTOLOAD_on(cv);
adb5a9ae 1276 }
adb5a9ae 1277
44a8e56a 1278 /*
1279 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1280 * The subroutine's original name may not be "AUTOLOAD", so we don't
1281 * use that, but for lack of anything better we will use the sub's
1282 * original package to look up $AUTOLOAD.
1283 */
18691622 1284 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1285 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1286 ENTER;
1287
c69033f2 1288 if (!isGV(vargv)) {
04ec7e59 1289 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1290#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1291 GvSV(vargv) = newSV(0);
c69033f2
NC		 1292#endif
1293 }
3d35f11b 1294 LEAVE;
e203899d 1295 varsv = GvSVn(vargv);
4bac9ae4
CS		 1296 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1297 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1298 sv_setsv(varsv, packname);
396482e1 1299 sv_catpvs(varsv, "::");
d40bf27b
NC		 1300 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1301 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1302 sv_catpvn_flags(
1303 varsv, name, len,
5bcd1ef4 1304 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1305 );
c8416c26
BF		 1306 if (is_utf8)
1307 SvUTF8_on(varsv);
a0d0e21e
LW		 1308 return gv;
1309}
1310
44a2ac75
YO		 1311
1312/* require_tie_mod() internal routine for requiring a module
486ec47a 1313 * that implements the logic of automatic ties like %! and %-
e94ea821
FC		 1314 * It loads the module and then calls the _tie_it subroutine
1315 * with the passed gv as an argument.
44a2ac75
YO		 1316 *
1317 * The "gv" parameter should be the glob.
ee33cc1a 1318 * "varname" holds the 1-char name of the var, used for error messages.
45cbc99a 1319 * "namesv" holds the module name. Its refcount will be decremented.
45cbc99a 1320 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1321 * For the protection of $! to work (it is set by this routine)
1322 * the sv slot must already be magicalized.
d2c93421 1323 */
e94ea821 1324STATIC void
ee33cc1a 1325S_require_tie_mod(pTHX_ GV *gv, const char varname, const char * name,
a1683482 1326 STRLEN len, const U32 flags)
d2c93421 1327{
e94ea821 1328 const SV * const target = varname == '[' ? GvSV(gv) : (SV *)GvHV(gv);
45cbc99a 1329
7918f24d
NC		 1330 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1331
e94ea821
FC		 1332 /* If it is not tied */
1333 if (!target || !SvRMAGICAL(target)
1334 || !mg_find(target,
1335 varname == '[' ? PERL_MAGIC_tiedscalar : PERL_MAGIC_tied))
1336 {
1337 HV *stash;
1338 GV **gvp;
1339 dSP;
1340
1341 ENTER;
e94ea821 1342
4c4f3c46 1343#define HV_FETCH_TIE_FUNC (GV **)hv_fetchs(stash, "_tie_it", 0)
e94ea821
FC		 1344
1345 /* Load the module if it is not loaded. */
360cebfd 1346 if (!(stash = gv_stashpvn(name, len, 0))
e94ea821
FC		 1347 || !(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
1348 {
360cebfd 1349 SV * const module = newSVpvn(name, len);
b82b06b8 1350 const char type = varname == '[' ? '$' : '%';
44a2ac75 1351 if ( flags & 1 )
45cbc99a 1352 save_scalar(gv);
5b2ef88e 1353 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1354 assert(sp == PL_stack_sp);
360cebfd 1355 stash = gv_stashpvn(name, len, 0);
44a2ac75 1356 if (!stash)
360cebfd
FC		 1357 Perl_croak(aTHX_ "panic: Can't use %c%c because %s is not available",
1358 type, varname, name);
e94ea821 1359 else if (!(gvp = HV_FETCH_TIE_FUNC) || !*gvp || !GvCV(*gvp))
360cebfd
FC		 1360 Perl_croak(aTHX_ "panic: Can't use %c%c because %s does not define _tie_it",
1361 type, varname, name);
e94ea821
FC		 1362 }
1363 /* Now call the tie function. It should be in *gvp. */
1364 assert(gvp); assert(*gvp); assert(GvCV(*gvp));
1365 PUSHMARK(SP);
1366 XPUSHs((SV *)gv);
1367 PUTBACK;
1368 call_sv((SV *)*gvp, G_VOID|G_DISCARD);
1369 LEAVE;
d2c93421
RH		 1370 }
1371}
1372
7c719134
YO		 1373/* add a require_tie_mod_s - the _s suffix is similar to pvs type suffixes,
1374 * IOW it means we do STR_WITH_LEN() ourselves and the user should pass in
1375 * a true string WITHOUT a len.
1376 */
1377#define require_tie_mod_s(gv, varname, name, flags) \
1378 S_require_tie_mod(aTHX_ gv, varname, STR_WITH_LEN(name), flags)
1379
954c1994
GS		 1380/*
1381=for apidoc gv_stashpv
1382
da51bb9b 1383Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1384determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1385
1386=cut
1387*/
1388
a0d0e21e 1389HV*
864dbfa3 1390Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1391{
7918f24d 1392 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1393 return gv_stashpvn(name, strlen(name), create);
1394}
1395
bc96cb06
SH		 1396/*
1397=for apidoc gv_stashpvn
1398
da51bb9b
NC		 1399Returns a pointer to the stash for a specified package. The C<namelen>
1400parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1401to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1402created if it does not already exist. If the package does not exist and
796b6530 1403C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC		 1404is returned.
1405
566a4718
YO		 1406Flags may be one of:
1407
1408 GV_ADD
1409 SVf_UTF8
1410 GV_NOADD_NOINIT
1411 GV_NOINIT
1412 GV_NOEXPAND
1413 GV_ADDMG
1414
796b6530 1415The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1416
808724c8 1417Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1418recommended for performance reasons.
1419
bc96cb06
SH		 1420=cut
1421*/
1422
0eadbdad
YO		 1423/*
1424gv_stashpvn_internal
1425
1426Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1427as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1428
1429*/
1430
4e7ebec5 1431PERL_STATIC_INLINE HV*
0eadbdad 1432S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1433{
0cea0058 1434 char smallbuf[128];
46fc3d4c 1435 char *tmpbuf;
a0d0e21e
LW		 1436 HV *stash;
1437 GV *tmpgv;
add0ecde 1438 U32 tmplen = namelen + 2;
dc437b57 1439
0eadbdad 1440 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1441
add0ecde 1442 if (tmplen <= sizeof smallbuf)
46fc3d4c 1443 tmpbuf = smallbuf;
1444 else
add0ecde
VP		 1445 Newx(tmpbuf, tmplen, char);
1446 Copy(name, tmpbuf, namelen, char);
1447 tmpbuf[namelen] = ':';
1448 tmpbuf[namelen+1] = ':';
1449 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1450 if (tmpbuf != smallbuf)
1451 Safefree(tmpbuf);
d2fcb1d6 1452 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1453 return NULL;
a0d0e21e 1454 stash = GvHV(tmpgv);
1f656fcf 1455 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1456 assert(stash);
1f656fcf 1457 if (!HvNAME_get(stash)) {
0be4d16f 1458 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1459
1460 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1461 /* If the containing stash has multiple effective
1462 names, see that this one gets them, too. */
1463 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1464 mro_package_moved(stash, NULL, tmpgv, 1);
1465 }
a0d0e21e 1466 return stash;
463ee0b2
LW		 1467}
1468
808724c8 1469/*
1470gv_stashsvpvn_cached
1471
1472Returns a pointer to the stash for a specified package, possibly
48a81373 1473cached. Implements both C<gv_stashpvn> and C<gv_stashsv>.
808724c8 1474
1475Requires one of either namesv or namepv to be non-null.
1476
fbe13c60 1477See C<L</gv_stashpvn>> for details on "flags".
808724c8 1478
1479Note the sv interface is strongly preferred for performance reasons.
1480
1481*/
1482
1483#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1484 assert(namesv || name)
1485
1486PERL_STATIC_INLINE HV*
1487S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1488{
1489 HV* stash;
808724c8 1490 HE* he;
1491
1492 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1493
1494 he = (HE *)hv_common(
1495 PL_stashcache, namesv, name, namelen,
4e7ebec5 1496 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1497 );
808724c8 1498
4e7ebec5 1499 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1500 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1501
808724c8 1502 if (namesv) {
1503 if (SvOK(namesv)) { /* prevent double uninit warning */
1504 STRLEN len;
1505 name = SvPV_const(namesv, len);
1506 namelen = len;
1507 flags |= SvUTF8(namesv);
1508 } else {
1509 name = ""; namelen = 0;
1510 }
1511 }
0eadbdad
YO		 1512 stash = gv_stashpvn_internal(name, namelen, flags);
1513
4e7ebec5 1514 if (stash && namelen) {
1515 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1516 (void)hv_store(PL_stashcache, name,
4e7ebec5 1517 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1518 }
808724c8 1519
4e7ebec5 1520 return stash;
1521}
1522
808724c8 1523HV*
1524Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1525{
1526 PERL_ARGS_ASSERT_GV_STASHPVN;
1527 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1528}
1529
954c1994
GS		 1530/*
1531=for apidoc gv_stashsv
1532
fbe13c60
KW		 1533Returns a pointer to the stash for a specified package. See
1534C<L</gv_stashpvn>>.
954c1994 1535
fbe13c60
KW		 1536Note this interface is strongly preferred over C<gv_stashpvn> for performance
1537reasons.
808724c8 1538
954c1994
GS		 1539=cut
1540*/
1541
a0d0e21e 1542HV*
da51bb9b 1543Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1544{
7918f24d 1545 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1546 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1547}
1548
1549
463ee0b2 1550GV *
fe9845cc 1551Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1552 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1553 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1554}
1555
1556GV *
fe9845cc 1557Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1558 STRLEN len;
77cb3b01
FC		 1559 const char * const nambeg =
1560 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1561 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1562 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1563}
1564
90aeefb4 1565PERL_STATIC_INLINE void
290a1700 1566S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1567{
1568 AV* av;
1569
1570 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1571
1572 av = GvAVn(gv);
1573 GvMULTI_on(gv);
1574 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1575 NULL, 0);
ad7cce9f
FR		 1576}
1577
90aeefb4
BF		 1578/* This function grabs name and tries to split a stash and glob
1579 * from its contents. TODO better description, comments
1580 *
1581 * If the function returns TRUE and 'name == name_end', then
1582 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1583 */
1584PERL_STATIC_INLINE bool
1585S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1586 STRLEN *len, const char *nambeg, STRLEN full_len,
1587 const U32 is_utf8, const I32 add)
1588{
1589 const char *name_cursor;
1590 const char *const name_end = nambeg + full_len;
1591 const char *const name_em1 = name_end - 1;
1592
1593 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1594
7a207065
KW		 1595 if ( full_len > 2
1596 && **name == '*'
1597 && isIDFIRST_lazy_if_safe(*name + 1, name_end, is_utf8))
1598 {
90aeefb4
BF		 1599 /* accidental stringify on a GV? */
1600 (*name)++;
1601 }
1602
1603 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1604 if (name_cursor < name_em1 &&
1605 ((*name_cursor == ':' && name_cursor[1] == ':')
1606 || *name_cursor == '\''))
1607 {
1608 if (!*stash)
1609 *stash = PL_defstash;
1610 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1611 return FALSE;
1612
1613 *len = name_cursor - *name;
1614 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1615 const char *key;
1616 GV**gvp;
1617 if (*name_cursor == ':') {
1618 key = *name;
1619 *len += 2;
1620 }
1621 else {
1622 char *tmpbuf;
1623 Newx(tmpbuf, *len+2, char);
1624 Copy(*name, tmpbuf, *len, char);
1625 tmpbuf[(*len)++] = ':';
1626 tmpbuf[(*len)++] = ':';
1627 key = tmpbuf;
1628 }
c161da64 1629 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1630 *gv = gvp ? *gvp : NULL;
1631 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1632 if (SvTYPE(*gv) != SVt_PVGV)
1633 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1634 else
1635 GvMULTI_on(*gv);
1636 }
1637 if (key != *name)
1638 Safefree(key);
1639 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1640 return FALSE;
1641
1642 if (!(*stash = GvHV(*gv))) {
1643 *stash = GvHV(*gv) = newHV();
1644 if (!HvNAME_get(*stash)) {
1645 if (GvSTASH(*gv) == PL_defstash && *len == 6
4c4f3c46
YO		 1646 && strEQs(*name, "CORE"))
1647 hv_name_sets(*stash, "CORE", 0);
90aeefb4
BF		 1648 else
1649 hv_name_set(
1650 *stash, nambeg, name_cursor-nambeg, is_utf8
1651 );
1652 /* If the containing stash has multiple effective
1653 names, see that this one gets them, too. */
1654 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1655 mro_package_moved(*stash, NULL, *gv, 1);
1656 }
1657 }
1658 else if (!HvNAME_get(*stash))
1659 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1660 }
1661
1662 if (*name_cursor == ':')
1663 name_cursor++;
1664 *name = name_cursor+1;
1665 if (*name == name_end) {
1666 if (!*gv)
1667 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1668 return TRUE;
1669 }
1670 }
1671 }
1672 *len = name_cursor - *name;
1673 return TRUE;
1674}
1675
536d1a88 1676/* Checks if an unqualified name is in the main stash */
90aeefb4 1677PERL_STATIC_INLINE bool
536d1a88 1678S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1679{
536d1a88 1680 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1681
90aeefb4 1682 /* If it's an alphanumeric variable */
7a207065 1683 if ( len && isIDFIRST_lazy_if_safe(name, name + len, is_utf8) ) {
90aeefb4
BF		 1684 /* Some "normal" variables are always in main::,
1685 * like INC or STDOUT.
1686 */
1687 switch (len) {
1688 case 1:
1689 if (*name == '_')
536d1a88 1690 return TRUE;
90aeefb4
BF		 1691 break;
1692 case 3:
1693 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1694 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1695 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1696 return TRUE;
90aeefb4
BF		 1697 break;
1698 case 4:
1699 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1700 && name[3] == 'V')
536d1a88 1701 return TRUE;
90aeefb4
BF		 1702 break;
1703 case 5:
1704 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1705 && name[3] == 'I' && name[4] == 'N')
536d1a88 1706 return TRUE;
90aeefb4
BF		 1707 break;
1708 case 6:
1709 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1710 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1711 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1712 return TRUE;
90aeefb4
BF		 1713 break;
1714 case 7:
1715 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1716 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1717 && name[6] == 'T')
536d1a88 1718 return TRUE;
90aeefb4
BF		 1719 break;
1720 }
536d1a88
BF		 1721 }
1722 /* *{""}, or a special variable like $@ */
1723 else
1724 return TRUE;
1725
1726 return FALSE;
1727}
1728
1729
1730/* This function is called if parse_gv_stash_name() failed to
1731 * find a stash, or if GV_NOTQUAL or an empty name was passed
1732 * to gv_fetchpvn_flags.
1733 *
1734 * It returns FALSE if the default stash can't be found nor created,
1735 * which might happen during global destruction.
1736 */
1737PERL_STATIC_INLINE bool
1738S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1739 const U32 is_utf8, const I32 add,
1740 const svtype sv_type)
1741{
1742 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1743
1744 /* No stash in name, so see how we can default */
90aeefb4 1745
536d1a88
BF		 1746 if ( gv_is_in_main(name, len, is_utf8) ) {
1747 *stash = PL_defstash;
1748 }
1749 else {
1750 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1751 *stash = PL_curstash;
1752 if (add && (PL_hints & HINT_STRICT_VARS) &&
1753 sv_type != SVt_PVCV &&
1754 sv_type != SVt_PVGV &&
1755 sv_type != SVt_PVFM &&
1756 sv_type != SVt_PVIO &&
1757 !(len == 1 && sv_type == SVt_PV &&
1758 (*name == 'a' || *name == 'b')) )
1759 {
c161da64 1760 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1761 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1762 SvTYPE(*gvp) != SVt_PVGV)
1763 {
1764 *stash = NULL;
1765 }
1766 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1767 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1768 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1769 {
1770 /* diag_listed_as: Variable "%s" is not imported%s */
1771 Perl_ck_warner_d(
1772 aTHX_ packWARN(WARN_MISC),
147e3846 1773 "Variable \"%c%" UTF8f "\" is not imported",
90aeefb4
BF		 1774 sv_type == SVt_PVAV ? '@' :
1775 sv_type == SVt_PVHV ? '%' : '$',
1776 UTF8fARG(is_utf8, len, name));
1777 if (GvCVu(*gvp))
1778 Perl_ck_warner_d(
1779 aTHX_ packWARN(WARN_MISC),
147e3846 1780 "\t(Did you mean &%" UTF8f " instead?)\n",
90aeefb4
BF		 1781 UTF8fARG(is_utf8, len, name)
1782 );
1783 *stash = NULL;
1784 }
1785 }
1786 }
1787 else {
1788 /* Use the current op's stash */
1789 *stash = CopSTASH(PL_curcop);
1790 }
1791 }
90aeefb4
BF		 1792
1793 if (!*stash) {
1794 if (add && !PL_in_clean_all) {
10860bf4
FC		 1795 GV *gv;
1796 qerror(Perl_mess(aTHX_
147e3846 1797 "Global symbol \"%s%" UTF8f
d8c6310a 1798 "\" requires explicit package name (did you forget to "
147e3846 1799 "declare \"my %s%" UTF8f "\"?)",
d8c6310a
FC		 1800 (sv_type == SVt_PV ? "$"
1801 : sv_type == SVt_PVAV ? "@"
1802 : sv_type == SVt_PVHV ? "%"
1803 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1804 (sv_type == SVt_PV ? "$"
1805 : sv_type == SVt_PVAV ? "@"
1806 : sv_type == SVt_PVHV ? "%"
10860bf4 1807 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1808 /* To maintain the output of errors after the strict exception
1809 * above, and to keep compat with older releases, rather than
1810 * placing the variables in the pad, we place
1811 * them in the <none>:: stash.
1812 */
90aeefb4
BF		 1813 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1814 if (!gv) {
1815 /* symbol table under destruction */
1816 return FALSE;
1817 }
1818 *stash = GvHV(gv);
1819 }
1820 else
1821 return FALSE;
1822 }
1823
1824 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1825 return FALSE;
1826
1827 return TRUE;
1828}
1829
8c995aba
FC		 1830/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1831 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1832 this file. */
1833#undef SvREADONLY_on
1834#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1835
930867a8
BF		 1836/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1837 * a new GV.
1838 * Note that it does not insert the GV into the stash prior to
1839 * magicalization, which some variables require need in order
1840 * to work (like $[, %+, %-, %!), so callers must take care of
1321bbe3 1841 * that.
930867a8 1842 *
1321bbe3
FC		 1843 * It returns true if the gv did turn out to be magical one; i.e.,
1844 * if gv_magicalize actually did something.
930867a8
BF		 1845 */
1846PERL_STATIC_INLINE bool
1847S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
1321bbe3 1848 const svtype sv_type)
79072805 1849{
960b831f 1850 SSize_t paren;
79072805 1851
930867a8 1852 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1853
44428a46 1854 if (stash != PL_defstash) { /* not the main stash */
ea238638 1855 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1856 and VERSION. All the others apply only to the main stash or to
1857 CORE (which is checked right after this). */
ea238638 1858 if (len) {
cc4c2da6 1859 switch (*name) {
cc4c2da6 1860 case 'E':
3092ee0c
YO		 1861 if (
1862 len >= 6 && name[1] == 'X' &&
1863 (memEQs(name, len, "EXPORT")
eafd371c
YO		 1864 ||memEQs(name, len, "EXPORT_OK")
1865 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1866 ||memEQs(name, len, "EXPORT_TAGS"))
eafd371c 1867 )
cc4c2da6
NC		 1868 GvMULTI_on(gv);
1869 break;
1870 case 'I':
eafd371c 1871 if (memEQs(name, len, "ISA"))
290a1700 1872 gv_magicalize_isa(gv);
cc4c2da6 1873 break;
44428a46 1874 case 'V':
eafd371c 1875 if (memEQs(name, len, "VERSION"))
44428a46
FC		 1876 GvMULTI_on(gv);
1877 break;
ea238638 1878 case 'a':
eafd371c 1879 if (stash == PL_debstash && memEQs(name, len, "args")) {
7bb33634
FC		 1880 GvMULTI_on(gv_AVadd(gv));
1881 break;
eafd371c
YO		 1882 }
1883 /* FALLTHROUGH */
ea238638
FC		 1884 case 'b':
1885 if (len == 1 && sv_type == SVt_PV)
1886 GvMULTI_on(gv);
924ba076 1887 /* FALLTHROUGH */
4aaa4757
FC		 1888 default:
1889 goto try_core;
1890 }
1321bbe3 1891 goto ret;
4aaa4757
FC		 1892 }
1893 try_core:
1894 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1895 /* Avoid null warning: */
1896 const char * const stashname = HvNAME(stash); assert(stashname);
4c4f3c46 1897 if (strEQs(stashname, "CORE"))
87566176 1898 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1899 }
1900 }
1901 else if (len > 1) {
1902#ifndef EBCDIC
1903 if (*name > 'V' ) {
1904 NOOP;
1905 /* Nothing else to do.
1906 The compiler will probably turn the switch statement into a
1907 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1908 the common case of lower case variable names. (On EBCDIC
1909 platforms, we can't just do:
1910 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1911 because cases like '\027' in the switch statement below are
1912 C1 (non-ASCII) controls on those platforms, so the remapping
1913 would make them larger than 'V')
1914 */
44428a46
FC		 1915 } else
1916#endif
1917 {
44428a46
FC		 1918 switch (*name) {
1919 case 'A':
eafd371c 1920 if (memEQs(name, len, "ARGV")) {
44428a46
FC		 1921 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1922 }
eafd371c 1923 else if (memEQs(name, len, "ARGVOUT")) {
44428a46
FC		 1924 GvMULTI_on(gv);
1925 }
1926 break;
1927 case 'E':
3092ee0c
YO		 1928 if (
1929 len >= 6 && name[1] == 'X' &&
1930 (memEQs(name, len, "EXPORT")
055ae706
YO		 1931 ||memEQs(name, len, "EXPORT_OK")
1932 ||memEQs(name, len, "EXPORT_FAIL")
3092ee0c 1933 ||memEQs(name, len, "EXPORT_TAGS"))
055ae706 1934 )
44428a46
FC		 1935 GvMULTI_on(gv);
1936 break;
1937 case 'I':
eafd371c 1938 if (memEQs(name, len, "ISA")) {
290a1700 1939 gv_magicalize_isa(gv);
44428a46
FC		 1940 }
1941 break;
cc4c2da6 1942 case 'S':
eafd371c 1943 if (memEQs(name, len, "SIG")) {
cc4c2da6
NC		 1944 HV *hv;
1945 I32 i;
d525a7b2
NC		 1946 if (!PL_psig_name) {
1947 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1948 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1949 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1950 } else {
1951 /* I think that the only way to get here is to re-use an
1952 embedded perl interpreter, where the previous
1953 use didn't clean up fully because
1954 PL_perl_destruct_level was 0. I'm not sure that we
1955 "support" that, in that I suspect in that scenario
1956 there are sufficient other garbage values left in the
1957 interpreter structure that something else will crash
1958 before we get here. I suspect that this is one of
1959 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1960 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1961 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1962 }
1963 GvMULTI_on(gv);
1964 hv = GvHVn(gv);
a0714e2c 1965 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1966 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1967 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1968 if (init)
1969 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1970 }
1971 }
1972 break;
1973 case 'V':
eafd371c 1974 if (memEQs(name, len, "VERSION"))
cc4c2da6
NC		 1975 GvMULTI_on(gv);
1976 break;
e5218da5 1977 case '\003': /* $^CHILD_ERROR_NATIVE */
eafd371c 1978 if (memEQs(name, len, "\003HILD_ERROR_NATIVE"))
e5218da5 1979 goto magicalize;
27deb0cf
YO		 1980 /* @{^CAPTURE} %{^CAPTURE} */
1981 if (memEQs(name, len, "\003APTURE")) {
1982 AV* const av = GvAVn(gv);
1983 UV uv= *name;
1984
1985 sv_magic(MUTABLE_SV(av), (SV*)uv, PERL_MAGIC_regdata, NULL, 0);
1986 SvREADONLY_on(av);
1987
1988 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1989 require_tie_mod_s(gv, '-', "Tie::Hash::NamedCapture",0);
1990
1991 } else /* %{^CAPTURE_ALL} */
1992 if (memEQs(name, len, "\003APTURE_ALL")) {
1993 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
1994 require_tie_mod_s(gv, '+', "Tie::Hash::NamedCapture",0);
1995 }
e5218da5 1996 break;
cc4c2da6 1997 case '\005': /* $^ENCODING */
eafd371c 1998 if (memEQs(name, len, "\005NCODING"))
cc4c2da6
NC		 1999 goto magicalize;
2000 break;
9ebf26ad 2001 case '\007': /* $^GLOBAL_PHASE */
eafd371c 2002 if (memEQs(name, len, "\007LOBAL_PHASE"))
9ebf26ad
FR		 2003 goto ro_magicalize;
2004 break;
8561ea1d 2005 case '\014': /* $^LAST_FH */
eafd371c 2006 if (memEQs(name, len, "\014AST_FH"))
8561ea1d
FC		 2007 goto ro_magicalize;
2008 break;
cde0cee5 2009 case '\015': /* $^MATCH */
eafd371c 2010 if (memEQs(name, len, "\015ATCH")) {
960b831f
NC		 2011 paren = RX_BUFF_IDX_CARET_FULLMATCH;
2012 goto storeparen;
2013 }
66230c86 2014 break;
cc4c2da6 2015 case '\017': /* $^OPEN */
eafd371c 2016 if (memEQs(name, len, "\017PEN"))
cc4c2da6
NC		 2017 goto magicalize;
2018 break;
cde0cee5 2019 case '\020': /* $^PREMATCH $^POSTMATCH */
eafd371c 2020 if (memEQs(name, len, "\020REMATCH")) {
960b831f
NC		 2021 paren = RX_BUFF_IDX_CARET_PREMATCH;
2022 goto storeparen;
2023 }
eafd371c 2024 if (memEQs(name, len, "\020OSTMATCH")) {
960b831f
NC		 2025 paren = RX_BUFF_IDX_CARET_POSTMATCH;
2026 goto storeparen;
2027 }
9ebf26ad 2028 break;
cc4c2da6 2029 case '\024': /* ${^TAINT} */
eafd371c 2030 if (memEQs(name, len, "\024AINT"))
cc4c2da6
NC		 2031 goto ro_magicalize;
2032 break;
7cebcbc0 2033 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
eafd371c 2034 if (memEQs(name, len, "\025NICODE"))
cc4c2da6 2035 goto ro_magicalize;
eafd371c 2036 if (memEQs(name, len, "\025TF8LOCALE"))
7cebcbc0 2037 goto ro_magicalize;
eafd371c 2038 if (memEQs(name, len, "\025TF8CACHE"))
e07ea26a 2039 goto magicalize;
cc4c2da6
NC		 2040 break;
2041 case '\027': /* $^WARNING_BITS */
eafd371c 2042 if (memEQs(name, len, "\027ARNING_BITS"))
cc4c2da6 2043 goto magicalize;
8ca2a5d6 2044#ifdef WIN32
eafd371c 2045 else if (memEQs(name, len, "\027IN32_SLOPPY_STAT"))
8ca2a5d6
DD		 2046 goto magicalize;
2047#endif
cc4c2da6
NC		 2048 break;
2049 case '1':
2050 case '2':
2051 case '3':
2052 case '4':
2053 case '5':
2054 case '6':
2055 case '7':
2056 case '8':
2057 case '9':
85e6fe83 2058 {
2fdbfb4d
AB		 2059 /* Ensures that we have an all-digit variable, ${"1foo"} fails
2060 this test */
22ff3130
HS		 2061 UV uv;
2062 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1321bbe3 2063 goto ret;
22ff3130
HS		 2064 /* XXX why are we using a SSize_t? */
2065 paren = (SSize_t)(I32)uv;
960b831f 2066 goto storeparen;
1d7c1841 2067 }
dc437b57 2068 }
93a17b20 2069 }
392db708
NC		 2070 } else {
2071 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2072 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2073 switch (*name) {
6361f656 2074 case '&': /* $& */
960b831f
NC		 2075 paren = RX_BUFF_IDX_FULLMATCH;
2076 goto sawampersand;
6361f656 2077 case '`': /* $` */
960b831f
NC		 2078 paren = RX_BUFF_IDX_PREMATCH;
2079 goto sawampersand;
6361f656 2080 case '\'': /* $' */
960b831f
NC		 2081 paren = RX_BUFF_IDX_POSTMATCH;
2082 sawampersand:
1a904fc8 2083#ifdef PERL_SAWAMPERSAND
a289ef89 2084 if (!(
cc4c2da6
NC		 2085 sv_type == SVt_PVAV ||
2086 sv_type == SVt_PVHV ||
2087 sv_type == SVt_PVCV ||
2088 sv_type == SVt_PVFM ||
2089 sv_type == SVt_PVIO
d3b97530
DM		 2090 )) { PL_sawampersand |=
2091 (*name == '`')
2092 ? SAWAMPERSAND_LEFT
2093 : (*name == '&')
2094 ? SAWAMPERSAND_MIDDLE
2095 : SAWAMPERSAND_RIGHT;
2096 }
1a904fc8 2097#endif
960b831f 2098 goto storeparen;
e91d8259
NC		 2099 case '1': /* $1 */
2100 case '2': /* $2 */
2101 case '3': /* $3 */
2102 case '4': /* $4 */
2103 case '5': /* $5 */
2104 case '6': /* $6 */
2105 case '7': /* $7 */
2106 case '8': /* $8 */
2107 case '9': /* $9 */
960b831f
NC		 2108 paren = *name - '0';
2109
2110 storeparen:
e91d8259
NC		 2111 /* Flag the capture variables with a NULL mg_ptr
2112 Use mg_len for the array index to lookup. */
960b831f 2113 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2114 break;
cc4c2da6 2115
6361f656 2116 case ':': /* $: */
c69033f2 2117 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2118 goto magicalize;
2119
6361f656 2120 case '?': /* $? */
ff0cee69 2121#ifdef COMPLEX_STATUS
c69033f2 2122 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2123#endif
cc4c2da6 2124 goto magicalize;
ff0cee69 2125
6361f656 2126 case '!': /* $! */
67261566 2127 GvMULTI_on(gv);
44a2ac75 2128 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2129
ad64d0ec 2130 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2131
7c719134 2132 /* magicalization must be done before require_tie_mod_s is called */
67261566 2133 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
7c719134 2134 require_tie_mod_s(gv, '!', "Errno", 1);
d2c93421 2135
6cef1e77 2136 break;
754f85ad
YO		 2137 case '-': /* $-, %-, @- */
2138 case '+': /* $+, %+, @+ */
27deb0cf
YO		 2139 GvMULTI_on(gv); /* no used once warnings here */
2140 { /* $- $+ */
2141 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
2142 if (*name == '+')
2143 SvREADONLY_on(GvSVn(gv));
2144 }
2145 { /* %- %+ */
2146 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
2147 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture",0);
2148 }
2149 { /* @- @+ */
2150 AV* const av = GvAVn(gv);
2151 const UV uv = (UV)*name;
67261566 2152
27deb0cf
YO		 2153 sv_magic(MUTABLE_SV(av), (SV*)uv, PERL_MAGIC_regdata, NULL, 0);
2154 SvREADONLY_on(av);
2155 }
80305961 2156 break;
a678626e
A		 2157 case '*': /* $* */
2158 case '#': /* $# */
2159 if (sv_type == SVt_PV)
37398dc1 2160 /* diag_listed_as: $* is no longer supported. Its use will be fatal in Perl 5.30 */
a678626e 2161 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
37398dc1
A		 2162 "$%c is no longer supported. Its use "
2163 "will be fatal in Perl 5.30", *name);
a678626e 2164 break;
b3ca2e83
NC		 2165 case '\010': /* $^H */
2166 {
2167 HV *const hv = GvHVn(gv);
2168 hv_magic(hv, NULL, PERL_MAGIC_hints);
2169 }
2170 goto magicalize;
b82b06b8 2171 case '[': /* $[ */
7d69d4a6 2172 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2173 && FEATURE_ARYBASE_IS_ENABLED) {
7c719134 2174 require_tie_mod_s(gv,'[',"arybase",0);
b82b06b8 2175 }
7d69d4a6 2176 else goto magicalize;
b82b06b8 2177 break;
cc4c2da6 2178 case '\023': /* $^S */
2fdbfb4d
AB		 2179 ro_magicalize:
2180 SvREADONLY_on(GvSVn(gv));
924ba076 2181 /* FALLTHROUGH */
6361f656 2182 case '0': /* $0 */
6361f656
AB		 2183 case '^': /* $^ */
2184 case '~': /* $~ */
2185 case '=': /* $= */
2186 case '%': /* $% */
2187 case '.': /* $. */
2188 case '(': /* $( */
2189 case ')': /* $) */
2190 case '<': /* $< */
2191 case '>': /* $> */
2192 case '\\': /* $\ */
2193 case '/': /* $/ */
4505a31f 2194 case '|': /* $| */
9cdac2a2 2195 case '$': /* $$ */
cc4c2da6
NC		 2196 case '\001': /* $^A */
2197 case '\003': /* $^C */
2198 case '\004': /* $^D */
2199 case '\005': /* $^E */
2200 case '\006': /* $^F */
cc4c2da6
NC		 2201 case '\011': /* $^I, NOT \t in EBCDIC */
2202 case '\016': /* $^N */
2203 case '\017': /* $^O */
2204 case '\020': /* $^P */
2205 case '\024': /* $^T */
2206 case '\027': /* $^W */
2207 magicalize:
ad64d0ec 2208 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2209 break;
e521374c 2210
cc4c2da6 2211 case '\014': /* $^L */
76f68e9b 2212 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2213 break;
6361f656 2214 case ';': /* $; */
76f68e9b 2215 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2216 break;
6361f656 2217 case ']': /* $] */
cc4c2da6 2218 {
3638bf15 2219 SV * const sv = GvSV(gv);
d7aa5382 2220 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2221 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2222 GvSV(gv) = vnumify(PL_patchlevel);
2223 SvREADONLY_on(GvSV(gv));
2224 SvREFCNT_dec(sv);
93a17b20
LW		 2225 }
2226 break;
cc4c2da6
NC		 2227 case '\026': /* $^V */
2228 {
3638bf15 2229 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2230 GvSV(gv) = new_version(PL_patchlevel);
2231 SvREADONLY_on(GvSV(gv));
2232 SvREFCNT_dec(sv);
16070b82
GS		 2233 }
2234 break;
ea238638
FC		 2235 case 'a':
2236 case 'b':
dc3e91f6 2237 if (sv_type == SVt_PV)
ea238638 2238 GvMULTI_on(gv);
cc4c2da6 2239 }
79072805 2240 }
930867a8 2241
1321bbe3
FC		 2242 ret:
2243 /* Return true if we actually did something. */
2244 return GvAV(gv) || GvHV(gv) || GvIO(gv) || GvCV(gv)
2245 || ( GvSV(gv) && (
2246 SvOK(GvSV(gv)) || SvMAGICAL(GvSV(gv))
2247 )
2248 );
71c35c05
BF		 2249}
2250
8c995aba
FC		 2251/* If we do ever start using this later on in the file, we need to make
2252 sure we don’t accidentally use the wrong definition. */
2253#undef SvREADONLY_on
2254
070dc475
BF		 2255/* This function is called when the stash already holds the GV of the magic
2256 * variable we're looking for, but we need to check that it has the correct
2257 * kind of magic. For example, if someone first uses $! and then %!, the
2258 * latter would end up here, and we add the Errno tie to the HASH slot of
2259 * the *! glob.
2260 */
2261PERL_STATIC_INLINE void
2262S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2263{
2264 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2265
2266 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2267 if (*name == '!')
7c719134 2268 require_tie_mod_s(gv, '!', "Errno", 1);
070dc475 2269 else if (*name == '-' || *name == '+')
7c719134 2270 require_tie_mod_s(gv, *name, "Tie::Hash::NamedCapture", 0);
a678626e
A		 2271 } else if (sv_type == SVt_PV) {
2272 if (*name == '*' || *name == '#') {
37398dc1 2273 /* diag_listed_as: $# is no longer supported. Its use will be fatal in Perl 5.30 */
a678626e
A		 2274 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2275 WARN_SYNTAX),
37398dc1
A		 2276 "$%c is no longer supported. Its use "
2277 "will be fatal in Perl 5.30", *name);
a678626e 2278 }
070dc475
BF		 2279 }
2280 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2281 switch (*name) {
2282 case '[':
7c719134 2283 require_tie_mod_s(gv,'[',"arybase",0);
070dc475
BF		 2284 break;
2285#ifdef PERL_SAWAMPERSAND
2286 case '`':
2287 PL_sawampersand |= SAWAMPERSAND_LEFT;
2288 (void)GvSVn(gv);
2289 break;
2290 case '&':
2291 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2292 (void)GvSVn(gv);
2293 break;
2294 case '\'':
2295 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2296 (void)GvSVn(gv);
2297 break;
2298#endif
2299 }
2300 }
2301}
2302
71c35c05
BF		 2303GV *
2304Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2305 const svtype sv_type)
2306{
71c35c05
BF		 2307 const char *name = nambeg;
2308 GV *gv = NULL;
2309 GV**gvp;
2310 STRLEN len;
2311 HV *stash = NULL;
2312 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2313 const I32 no_expand = flags & GV_NOEXPAND;
2314 const I32 add = flags & ~GV_NOADD_MASK;
2315 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2316 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2317 const char *const name_end = nambeg + full_len;
2318 U32 faking_it;
2319
2320 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2321
2322 /* If we have GV_NOTQUAL, the caller promised that
2323 * there is no stash, so we can skip the check.
2324 * Similarly if full_len is 0, since then we're
2325 * dealing with something like *{""} or ""->foo()
2326 */
2327 if ((flags & GV_NOTQUAL) || !full_len) {
2328 len = full_len;
2329 }
2330 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2331 if (name == name_end) return gv;
2332 }
2333 else {
2334 return NULL;
2335 }
2336
2337 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2338 return NULL;
2339 }
2340
2341 /* By this point we should have a stash and a name */
c161da64 2342 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2343 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2344 if (addmg) gv = (GV *)newSV(0);
2345 else return NULL;
2346 }
2347 else gv = *gvp, addmg = 0;
2348 /* From this point on, addmg means gv has not been inserted in the
2349 symtab yet. */
2350
2351 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2352 /* The GV already exists, so return it, but check if we need to do
2353 * anything else with it before that.
2354 */
71c35c05 2355 if (add) {
c002ae9a
BF		 2356 /* This is the heuristic that handles if a variable triggers the
2357 * 'used only once' warning. If there's already a GV in the stash
2358 * with this name, then we assume that the variable has been used
2359 * before and turn its MULTI flag on.
2360 * It's a heuristic because it can easily be "tricked", like with
2361 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2362 * not warning about $main::foo being used just once
2363 */
71c35c05
BF		 2364 GvMULTI_on(gv);
2365 gv_init_svtype(gv, sv_type);
2366 /* You reach this path once the typeglob has already been created,
2367 either by the same or a different sigil. If this path didn't
2368 exist, then (say) referencing $! first, and %! second would
2369 mean that %! was not handled correctly. */
2370 if (len == 1 && stash == PL_defstash) {
070dc475 2371 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2372 }
2373 else if (len == 3 && sv_type == SVt_PVAV
eafd371c 2374 && strEQs(name, "ISA")
71c35c05
BF		 2375 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2376 gv_magicalize_isa(gv);
2377 }
2378 return gv;
2379 } else if (no_init) {
2380 assert(!addmg);
2381 return gv;
c002ae9a
BF		 2382 }
2383 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2384 * don't expand it to a glob. This is an optimization so that things
2385 * copying constants over, like Exporter, don't have to be rewritten
2386 * to take into account that you can store more than just globs in
2387 * stashes.
2388 */
2389 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2390 assert(!addmg);
2391 return gv;
2392 }
2393
2394 /* Adding a new symbol.
2395 Unless of course there was already something non-GV here, in which case
2396 we want to behave as if there was always a GV here, containing some sort
2397 of subroutine.
2398 Otherwise we run the risk of creating things like GvIO, which can cause
2399 subtle bugs. eg the one that tripped up SQL::Translator */
2400
2401 faking_it = SvOK(gv);
2402
2403 if (add & GV_ADDWARN)
2404 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
147e3846 2405 "Had to create %" UTF8f " unexpectedly",
71c35c05
BF		 2406 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2407 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2408
7a207065
KW		 2409 if ( full_len != 0
2410 && isIDFIRST_lazy_if_safe(name, name + full_len, is_utf8)
2411 && !ckWARN(WARN_ONCE) )
2412 {
71c35c05 2413 GvMULTI_on(gv) ;
7a207065 2414 }
71c35c05
BF		 2415
2416 /* set up magic where warranted */
1321bbe3 2417 if ( gv_magicalize(gv, stash, name, len, sv_type) ) {
930867a8 2418 /* See 23496c6 */
1321bbe3
FC		 2419 if (addmg) {
2420 /* gv_magicalize magicalised this gv, so we want it
930867a8 2421 * stored in the symtab.
1321bbe3
FC		 2422 * Effectively the caller is asking, ‘Does this gv exist?’
2423 * And we respond, ‘Er, *now* it does!’
930867a8
BF		 2424 */
2425 (void)hv_store(stash,name,len,(SV *)gv,0);
1321bbe3
FC		 2426 }
2427 }
2428 else if (addmg) {
2429 /* The temporary GV created above */
930867a8
BF		 2430 SvREFCNT_dec_NN(gv);
2431 gv = NULL;
930867a8 2432 }
71c35c05 2433
e6066781 2434 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2435 return gv;
79072805
LW		 2436}
2437
2438void
35a4481c 2439Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2440{
ed60a868 2441 const char *name;
35a4481c 2442 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2443
2444 PERL_ARGS_ASSERT_GV_FULLNAME4;
2445
666ea192 2446 sv_setpv(sv, prefix ? prefix : "");
a0288114 2447
52a6327b 2448 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2449 const STRLEN len = HvNAMELEN(hv);
2450 if (keepmain || strnNE(name, "main", len)) {
2451 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2452 sv_catpvs(sv,"::");
ed60a868 2453 }
43693395 2454 }
ed60a868 2455 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2456 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2457}
2458
2459void
35a4481c 2460Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2461{
099be4f1 2462 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2463
2464 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2465
46c461b5 2466 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2467}
2468
39a65960
DM		 2469
2470/* recursively scan a stash and any nested stashes looking for entries
2471 * that need the "only used once" warning raised
2472 */
2473
79072805 2474void
51da40ed 2475Perl_gv_check(pTHX_ HV *stash)
79072805 2476{
eb578fdb 2477 I32 i;
463ee0b2 2478
7918f24d
NC		 2479 PERL_ARGS_ASSERT_GV_CHECK;
2480
9e5cda6b 2481 if (!SvOOK(stash))
8990e307 2482 return;
90754377 2483
9e5cda6b 2484 assert(HvARRAY(stash));
90754377 2485
a0d0e21e 2486 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2487 const HE *entry;
90754377 2488 /* mark stash is being scanned, to avoid recursing */
339441ef 2489 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2490 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2491 GV *gv;
b7787f18 2492 HV *hv;
e7acdfe9
DM		 2493 STRLEN keylen = HeKLEN(entry);
2494 const char * const key = HeKEY(entry);
2495
2496 if (keylen >= 2 && key[keylen-2] == ':' && key[keylen-1] == ':' &&
159b6efe 2497 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2498 {
90754377
DM		 2499 if (hv != PL_defstash && hv != stash
2500 && !(SvOOK(hv)
2501 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2502 )
a0d0e21e
LW		 2503 gv_check(hv); /* nested package */
2504 }
7a207065
KW		 2505 else if ( HeKLEN(entry) != 0
2506 && *HeKEY(entry) != '_'
2507 && isIDFIRST_lazy_if_safe(HeKEY(entry),
2508 HeKEY(entry) + HeKLEN(entry),
2509 HeUTF8(entry)) )
2510 {
e1ec3a88 2511 const char *file;
159b6efe 2512 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2513 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2514 continue;
1d7c1841 2515 file = GvFILE(gv);
1d7c1841 2516 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2517#ifdef USE_ITHREADS
2518 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2519#else
2520 CopFILEGV(PL_curcop)
2521 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2522#endif
9014280d 2523 Perl_warner(aTHX_ packWARN(WARN_ONCE),
147e3846 2524 "Name \"%" HEKf "::%" HEKf
d0c0e7dd
FC		 2525 "\" used only once: possible typo",
2526 HEKfARG(HvNAME_HEK(stash)),
2527 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2528 }
79072805 2529 }
339441ef 2530 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2531 }
2532}
2533
2534GV *
9cc50d5b 2535Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2536{
9cc50d5b 2537 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2538 assert(!(flags & ~SVf_UTF8));
7918f24d 2539
147e3846 2540 return gv_fetchpv(Perl_form(aTHX_ "%" UTF8f "::_GEN_%ld",
b17a0679 2541 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2542 (long)PL_gensym++),
2543 GV_ADD, SVt_PVGV);
79072805
LW		 2544}
2545
2546/* hopefully this is only called on local symbol table entries */
2547
2548GP*
864dbfa3 2549Perl_gp_ref(pTHX_ GP *gp)
79072805 2550{
1d7c1841 2551 if (!gp)
d4c19fe8 2552 return NULL;
79072805 2553 gp->gp_refcnt++;
44a8e56a 2554 if (gp->gp_cv) {
2555 if (gp->gp_cvgen) {
e1a479c5
BB		 2556 /* If the GP they asked for a reference to contains
2557 a method cache entry, clear it first, so that we
2558 don't infect them with our cached entry */
e7881358 2559 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2560 gp->gp_cv = NULL;
44a8e56a 2561 gp->gp_cvgen = 0;
2562 }
44a8e56a 2563 }
79072805 2564 return gp;
79072805
LW		 2565}
2566
2567void
864dbfa3 2568Perl_gp_free(pTHX_ GV *gv)
79072805 2569{
79072805 2570 GP* gp;
b0d55c99 2571 int attempts = 100;
79072805 2572
f7877b28 2573 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2574 return;
f248d071 2575 if (gp->gp_refcnt == 0) {
9b387841
NC		 2576 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2577 "Attempt to free unreferenced glob pointers"
2578 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2579 return;
2580 }
4571f4a7 2581 if (gp->gp_refcnt > 1) {
bc81b34d 2582 borrowed:
748a9306
LW		 2583 if (gp->gp_egv == gv)
2584 gp->gp_egv = 0;
4571f4a7 2585 gp->gp_refcnt--;
c43ae56f 2586 GvGP_set(gv, NULL);
79072805 2587 return;
748a9306 2588 }
79072805 2589
b0d55c99
FC		 2590 while (1) {
2591 /* Copy and null out all the glob slots, so destructors do not see
2592 freed SVs. */
2593 HEK * const file_hek = gp->gp_file_hek;
2594 SV * const sv = gp->gp_sv;
2595 AV * const av = gp->gp_av;
2596 HV * const hv = gp->gp_hv;
2597 IO * const io = gp->gp_io;
2598 CV * const cv = gp->gp_cv;
2599 CV * const form = gp->gp_form;
2600
2601 gp->gp_file_hek = NULL;
2602 gp->gp_sv = NULL;
2603 gp->gp_av = NULL;
2604 gp->gp_hv = NULL;
2605 gp->gp_io = NULL;
2606 gp->gp_cv = NULL;
2607 gp->gp_form = NULL;
2608
2609 if (file_hek)
2610 unshare_hek(file_hek);
2611
2612 SvREFCNT_dec(sv);
2613 SvREFCNT_dec(av);
2614 /* FIXME - another reference loop GV -> symtab -> GV ?
2615 Somehow gp->gp_hv can end up pointing at freed garbage. */
2616 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2617 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2618 if (PL_stashcache && hvname_hek) {
2619 DEBUG_o(Perl_deb(aTHX_
147e3846 2620 "gp_free clearing PL_stashcache for '%" HEKf "'\n",
923ed580 2621 HEKfARG(hvname_hek)));
0ca9877d 2622 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2623 }
b0d55c99
FC		 2624 SvREFCNT_dec(hv);
2625 }
96d7c888
FC		 2626 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2627 && (IoTYPE(io) == IoTYPE_WRONLY ||
2628 IoTYPE(io) == IoTYPE_RDWR ||
2629 IoTYPE(io) == IoTYPE_APPEND)
2630 && ckWARN_d(WARN_IO)
2631 && IoIFP(io) != PerlIO_stdin()
2632 && IoIFP(io) != PerlIO_stdout()
2633 && IoIFP(io) != PerlIO_stderr()
2634 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2635 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2636 SvREFCNT_dec(io);
2637 SvREFCNT_dec(cv);
2638 SvREFCNT_dec(form);
2639
bc81b34d
FC		 2640 /* Possibly reallocated by a destructor */
2641 gp = GvGP(gv);
2642
b0d55c99
FC		 2643 if (!gp->gp_file_hek
2644 && !gp->gp_sv
2645 && !gp->gp_av
2646 && !gp->gp_hv
2647 && !gp->gp_io
2648 && !gp->gp_cv
2649 && !gp->gp_form) break;
2650
2651 if (--attempts == 0) {
2652 Perl_die(aTHX_
2653 "panic: gp_free failed to free glob pointer - "
2654 "something is repeatedly re-creating entries"
2655 );
2656 }
13207a71 2657 }
748a9306 2658
bc81b34d
FC		 2659 /* Possibly incremented by a destructor doing glob assignment */
2660 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2661 Safefree(gp);
c43ae56f 2662 GvGP_set(gv, NULL);
79072805
LW		 2663}
2664
d460ef45
NIS		 2665int
2666Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2667{
53c1dcc0
AL		 2668 AMT * const amtp = (AMT*)mg->mg_ptr;
2669 PERL_UNUSED_ARG(sv);
dd374669 2670
7918f24d
NC		 2671 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2672
d460ef45
NIS		 2673 if (amtp && AMT_AMAGIC(amtp)) {
2674 int i;
2675 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2676 CV * const cv = amtp->table[i];
b37c2d43 2677 if (cv) {
e7881358 2678 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2679 amtp->table[i] = NULL;
d460ef45
NIS		 2680 }
2681 }
2682 }
2683 return 0;
2684}
2685
a0d0e21e 2686/* Updates and caches the CV's */
c3a9a790
RGS		 2687/* Returns:
2688 * 1 on success and there is some overload
2689 * 0 if there is no overload
2690 * -1 if some error occurred and it couldn't croak
2691 */
a0d0e21e 2692
c3a9a790 2693int
242f8760 2694Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2695{
ad64d0ec 2696 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2697 AMT amt;
9b439311 2698 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2699 U32 newgen;
a0d0e21e 2700
7918f24d
NC		 2701 PERL_ARGS_ASSERT_GV_AMUPDATE;
2702
9b439311 2703 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2704 if (mg) {
2705 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2706 if (amtp->was_ok_sub == newgen) {
8c34e50d 2707 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2708 }
ad64d0ec 2709 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2710 }
a0d0e21e 2711
bfcb3514 2712 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2713
d460ef45 2714 Zero(&amt,1,AMT);
e1a479c5 2715 amt.was_ok_sub = newgen;
a6006777 2716 amt.fallback = AMGfallNO;
2717 amt.flags = 0;
2718
a6006777 2719 {
8c34e50d
FC		 2720 int filled = 0;
2721 int i;
3d147ac2
DM		 2722 bool deref_seen = 0;
2723
a6006777 2724
3866ea3b 2725 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2726
89ffc314 2727 /* Try to find via inheritance. */
e6919483 2728 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2729 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2730 CV* cv;
89ffc314
IZ		 2731
2732 if (!gv)
3866ea3b
FC		 2733 {
2734 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2735 goto no_table;
3866ea3b
FC		 2736 }
2737#ifdef PERL_DONT_CREATE_GVSV
2738 else if (!sv) {
6f207bd3 2739 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2740 }
2741#endif
79c9643d
JL		 2742 else if (SvTRUE(sv))
2743 /* don't need to set overloading here because fallback => 1
2744 * is the default setting for classes without overloading */
89ffc314 2745 amt.fallback=AMGfallYES;
79c9643d
JL		 2746 else if (SvOK(sv)) {
2747 amt.fallback=AMGfallNEVER;
386a5489 2748 filled = 1;
386a5489 2749 }
79c9643d 2750 else {
386a5489 2751 filled = 1;
386a5489 2752 }
a6006777 2753
3d147ac2 2754 assert(SvOOK(stash));
3d147ac2 2755 /* initially assume the worst */
339441ef 2756 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2757
8c34e50d 2758 for (i = 1; i < NofAMmeth; i++) {
6136c704 2759 const char * const cooky = PL_AMG_names[i];
32251b26 2760 /* Human-readable form, for debugging: */
8c34e50d 2761 const char * const cp = AMG_id2name(i);
d279ab82 2762 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2763
a0288114 2764 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2765 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2766 /* don't fill the cache while looking up!
2767 Creation of inheritance stubs in intermediate packages may
2768 conflict with the logic of runtime method substitution.
2769 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2770 then we could have created stubs for "(+0" in A and C too.
2771 But if B overloads "bool", we may want to use it for
2772 numifying instead of C's "+0". */
8c34e50d 2773 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2774 cv = 0;
c3ad4e54
FC		 2775 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2776 const HEK * const gvhek =
2777 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2778 const HEK * const stashek =
2779 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2780 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2781 && stashek && HEK_LEN(stashek) == 8
2782 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2783 /* This is a hack to support autoloading..., while
2784 knowing *which* methods were declared as overloaded. */
44a8e56a 2785 /* GvSV contains the name of the method. */
6136c704 2786 GV *ngv = NULL;
c69033f2 2787 SV *gvsv = GvSV(gv);
a0288114 2788
147e3846 2789 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%" SVf256\
a0288114 2790 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2791 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2792 if (!gvsv || !SvPOK(gvsv)
7f415459 2793 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2794 {
a0288114 2795 /* Can be an import stub (created by "can"). */
242f8760 2796 if (destructing) {
c3a9a790 2797 return -1;
242f8760
RGS		 2798 }
2799 else {
d66cca07
BF		 2800 const SV * const name = (gvsv && SvPOK(gvsv))
2801 ? gvsv
2802 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2803 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
147e3846 2804 Perl_croak(aTHX_ "%s method \"%" SVf256
d66cca07 2805 "\" overloading \"%s\" "\
147e3846 2806 "in package \"%" HEKf256 "\"",
242f8760
RGS		 2807 (GvCVGEN(gv) ? "Stub found while resolving"
2808 : "Can't resolve"),
d66cca07 2809 SVfARG(name), cp,
d0c0e7dd 2810 HEKfARG(
d66cca07 2811 HvNAME_HEK(stash)
d0c0e7dd 2812 ));
242f8760 2813 }
44a8e56a 2814 }
dc848c6f 2815 cv = GvCV(gv = ngv);
44a8e56a 2816 }
b464bac0 2817 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2818 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2819 GvNAME(CvGV(cv))) );
2820 filled = 1;
611c1e95 2821 } else if (gv) { /* Autoloaded... */
ea726b52 2822 cv = MUTABLE_CV(gv);
611c1e95 2823 filled = 1;
44a8e56a 2824 }
ea726b52 2825 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2826
2827 if (gv) {
2828 switch (i) {
2829 case to_sv_amg:
2830 case to_av_amg:
2831 case to_hv_amg:
2832 case to_gv_amg:
2833 case to_cv_amg:
2834 case nomethod_amg:
2835 deref_seen = 1;
2836 break;
2837 }
2838 }
a0d0e21e 2839 }
3d147ac2 2840 if (!deref_seen)
45479970
DM		 2841 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2842 * NB - aux var invalid here, HvARRAY() could have been
2843 * reallocated since it was assigned to */
2844 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2845
a0d0e21e 2846 if (filled) {
a6006777 2847 AMT_AMAGIC_on(&amt);
ad64d0ec 2848 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2849 (char*)&amt, sizeof(AMT));
8c34e50d 2850 return TRUE;
a0d0e21e
LW		 2851 }
2852 }
a6006777 2853 /* Here we have no table: */
8c34e50d 2854 no_table:
a6006777 2855 AMT_AMAGIC_off(&amt);
ad64d0ec 2856 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2857 (char*)&amt, sizeof(AMTS));
c3a9a790 2858 return 0;
a0d0e21e
LW		 2859}
2860
32251b26
IZ		 2861
2862CV*
2863Perl_gv_handler(pTHX_ HV *stash, I32 id)
2864{
3f8f4626 2865 MAGIC *mg;
32251b26 2866 AMT *amtp;
e1a479c5 2867 U32 newgen;
9b439311 2868 struct mro_meta* stash_meta;
32251b26 2869
bfcb3514 2870 if (!stash || !HvNAME_get(stash))
601f1833 2871 return NULL;
e1a479c5 2872
9b439311
BB		 2873 stash_meta = HvMROMETA(stash);
2874 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2875
ad64d0ec 2876 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2877 if (!mg) {
2878 do_update:
8c34e50d 2879 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2880 return NULL;
ad64d0ec 2881 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2882 }
a9fd4e40 2883 assert(mg);
32251b26 2884 amtp = (AMT*)mg->mg_ptr;
66978156 2885 if ( amtp->was_ok_sub != newgen )
32251b26 2886 goto do_update;
3ad83ce7 2887 if (AMT_AMAGIC(amtp)) {
b7787f18 2888 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2889 if (ret && isGV(ret)) { /* Autoloading stab */
2890 /* Passing it through may have resulted in a warning
2891 "Inherited AUTOLOAD for a non-method deprecated", since
2892 our caller is going through a function call, not a method call.
2893 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2894 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2895
2896 if (gv && GvCV(gv))
2897 return GvCV(gv);
2898 }
2899 return ret;
2900 }
a0288114 2901
601f1833 2902 return NULL;
32251b26
IZ		 2903}
2904
2905
6f1401dc
DM		 2906/* Implement tryAMAGICun_MG macro.
2907 Do get magic, then see if the stack arg is overloaded and if so call it.
2908 Flags:
2909 AMGf_set return the arg using SETs rather than assigning to
2910 the targ
2911 AMGf_numeric apply sv_2num to the stack arg.
2912*/
2913
2914bool
2915Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2916 dSP;
2917 SV* tmpsv;
2918 SV* const arg = TOPs;
2919
2920 SvGETMAGIC(arg);
2921
9f8bf298 2922 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2923 AMGf_noright | AMGf_unary
2924 | (flags & AMGf_numarg))))
2925 {
6f1401dc
DM		 2926 if (flags & AMGf_set) {
2927 SETs(tmpsv);
2928 }
2929 else {
2930 dTARGET;
2931 if (SvPADMY(TARG)) {
2932 sv_setsv(TARG, tmpsv);
2933 SETTARG;
2934 }
2935 else
2936 SETs(tmpsv);
2937 }
2938 PUTBACK;
2939 return TRUE;
2940 }
2941
2942 if ((flags & AMGf_numeric) && SvROK(arg))
2943 *sp = sv_2num(arg);
2944 return FALSE;
2945}
2946
2947
2948/* Implement tryAMAGICbin_MG macro.
2949 Do get magic, then see if the two stack args are overloaded and if so
2950 call it.
2951 Flags:
2952 AMGf_set return the arg using SETs rather than assigning to
2953 the targ
2954 AMGf_assign op may be called as mutator (eg +=)
2955 AMGf_numeric apply sv_2num to the stack arg.
2956*/
2957
2958bool
2959Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2960 dSP;
2961 SV* const left = TOPm1s;
2962 SV* const right = TOPs;
2963
2964 SvGETMAGIC(left);
2965 if (left != right)
2966 SvGETMAGIC(right);
2967
2968 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2969 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC		 2970 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2971 | (flags & AMGf_numarg));
6f1401dc
DM		 2972 if (tmpsv) {
2973 if (flags & AMGf_set) {
2974 (void)POPs;
2975 SETs(tmpsv);
2976 }
2977 else {
2978 dATARGET;
2979 (void)POPs;
2980 if (opASSIGN || SvPADMY(TARG)) {
2981 sv_setsv(TARG, tmpsv);
2982 SETTARG;
2983 }
2984 else
2985 SETs(tmpsv);
2986 }
2987 PUTBACK;
2988 return TRUE;
2989 }
2990 }
75ea7a12
FC		 2991 if(left==right && SvGMAGICAL(left)) {
2992 SV * const left = sv_newmortal();
2993 *(sp-1) = left;
2994 /* Print the uninitialized warning now, so it includes the vari-
2995 able name. */
2996 if (!SvOK(right)) {
2997 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2998 sv_setsv_flags(left, &PL_sv_no, 0);
2999 }
3000 else sv_setsv_flags(left, right, 0);
3001 SvGETMAGIC(right);
3002 }
6f1401dc 3003 if (flags & AMGf_numeric) {
75ea7a12
FC		 3004 if (SvROK(TOPm1s))
3005 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 3006 if (SvROK(right))
3007 *sp = sv_2num(right);
3008 }
3009 return FALSE;
3010}
3011
25a9ffce
NC		 3012SV *
3013Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
3014 SV *tmpsv = NULL;
3d147ac2 3015 HV *stash;
25a9ffce
NC		 3016
3017 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
3018
3d147ac2
DM		 3019 if (!SvAMAGIC(ref))
3020 return ref;
3021 /* return quickly if none of the deref ops are overloaded */
3022 stash = SvSTASH(SvRV(ref));
3023 assert(SvOOK(stash));
3024 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
3025 return ref;
3026
3027 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 3028 AMGf_noright | AMGf_unary))) {
3029 if (!SvROK(tmpsv))
3030 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
3031 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
3032 /* Bail out if it returns us the same reference. */
3033 return tmpsv;
3034 }
3035 ref = tmpsv;
3d147ac2
DM		 3036 if (!SvAMAGIC(ref))
3037 break;
25a9ffce
NC		 3038 }
3039 return tmpsv ? tmpsv : ref;
3040}
6f1401dc 3041
8d569291
FC		 3042bool
3043Perl_amagic_is_enabled(pTHX_ int method)
3044{
3045 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
3046
3047 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
3048
3049 if ( !lex_mask || !SvOK(lex_mask) )
3050 /* overloading lexically disabled */
3051 return FALSE;
3052 else if ( lex_mask && SvPOK(lex_mask) ) {
3053 /* we have an entry in the hints hash, check if method has been
3054 * masked by overloading.pm */
3055 STRLEN len;
3056 const int offset = method / 8;
3057 const int bit = method % 8;
3058 char *pv = SvPV(lex_mask, len);
3059
3060 /* Bit set, so this overloading operator is disabled */
3061 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
3062 return FALSE;
3063 }
3064 return TRUE;
3065}
3066
a0d0e21e 3067SV*
864dbfa3 3068Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 3069{
27da23d5 3070 dVAR;
b267980d 3071 MAGIC *mg;
9c5ffd7c 3072 CV *cv=NULL;
a0d0e21e 3073 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3074 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3075 int off = 0, off1, lr = 0, notfound = 0;
3076 int postpr = 0, force_cpy = 0;
3077 int assign = AMGf_assign & flags;
3078 const int assignshift = assign ? 1 : 0;
bf5522a1 3079 int use_default_op = 0;
67288365 3080 int force_scalar = 0;
497b47a8
JH		 3081#ifdef DEBUGGING
3082 int fl=0;
497b47a8 3083#endif
25716404 3084 HV* stash=NULL;
7918f24d
NC		 3085
3086 PERL_ARGS_ASSERT_AMAGIC_CALL;
3087
e46c382e 3088 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3089 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3090 }
3091
a0d0e21e 3092 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3093 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3094 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3095 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3096 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3097 : NULL))
b267980d 3098 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3099 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3100 * usual method */
497b47a8
JH		 3101 (
3102#ifdef DEBUGGING
3103 fl = 1,
a0288114 3104#endif
497b47a8 3105 cv = cvp[off=method])))) {
a0d0e21e
LW		 3106 lr = -1; /* Call method for left argument */
3107 } else {
3108 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3109 int logic;
3110
3111 /* look for substituted methods */
ee239bfe 3112 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3113 switch (method) {
3114 case inc_amg:
ee239bfe
IZ		 3115 force_cpy = 1;
3116 if ((cv = cvp[off=add_ass_amg])
3117 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3118 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3119 }
3120 break;
3121 case dec_amg:
ee239bfe
IZ		 3122 force_cpy = 1;
3123 if ((cv = cvp[off = subtr_ass_amg])
3124 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3125 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3126 }
3127 break;
3128 case bool__amg:
3129 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3130 break;
3131 case numer_amg:
3132 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3133 break;
3134 case string_amg:
3135 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3136 break;
b7787f18
AL		 3137 case not_amg:
3138 (void)((cv = cvp[off=bool__amg])
3139 || (cv = cvp[off=numer_amg])
3140 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3141 if (cv)
3142 postpr = 1;
b7787f18 3143 break;
748a9306
LW		 3144 case copy_amg:
3145 {
76e3520e
GS		 3146 /*
3147 * SV* ref causes confusion with the interpreter variable of
3148 * the same name
3149 */
890ce7af 3150 SV* const tmpRef=SvRV(left);
76e3520e 3151 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3152 /*
3153 * Just to be extra cautious. Maybe in some
3154 * additional cases sv_setsv is safe, too.
3155 */
890ce7af 3156 SV* const newref = newSVsv(tmpRef);
748a9306 3157 SvOBJECT_on(newref);
a1cd65be
FC		 3158 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3159 delegate to the stash. */
85fbaab2 3160 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3161 return newref;
3162 }
3163 }
3164 break;
a0d0e21e 3165 case abs_amg:
b267980d 3166 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3167 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3168 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3169 if (off1==lt_amg) {
890ce7af 3170 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3171 lt_amg,AMGf_noright);
3172 logic = SvTRUE(lessp);
3173 } else {
890ce7af 3174 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3175 ncmp_amg,AMGf_noright);
3176 logic = (SvNV(lessp) < 0);
3177 }
3178 if (logic) {
3179 if (off==subtr_amg) {
3180 right = left;
748a9306 3181 left = nullsv;
a0d0e21e
LW		 3182 lr = 1;
3183 }
3184 } else {
3185 return left;
3186 }
3187 }
3188 break;
3189 case neg_amg:
155aba94 3190 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3191 right = left;
3192 left = sv_2mortal(newSViv(0));
3193 lr = 1;
3194 }
3195 break;
f216259d 3196 case int_amg:
f5284f61 3197 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3198 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3199 case regexp_amg:
b267980d
NIS		 3200 /* FAIL safe */
3201 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3202
f5284f61
IZ		 3203 case to_sv_amg:
3204 case to_av_amg:
3205 case to_hv_amg:
3206 case to_gv_amg:
3207 case to_cv_amg:
3208 /* FAIL safe */
b267980d 3209 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3210
a0d0e21e
LW		 3211 default:
3212 goto not_found;
3213 }
3214 if (!cv) goto not_found;
3215 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3216 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3217 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3218 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3219 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3220 : NULL))
69815d08
RS		 3221 && (cv = cvp[off=method])) { /* Method for right
3222 * argument found */
3223 lr=1;
bf5522a1
MB		 3224 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3225 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3226 && !(flags & AMGf_unary)) {
3227 /* We look for substitution for
3228 * comparison operations and
fc36a67e 3229 * concatenation */
a0d0e21e
LW		 3230 if (method==concat_amg || method==concat_ass_amg
3231 || method==repeat_amg || method==repeat_ass_amg) {
3232 return NULL; /* Delegate operation to string conversion */
3233 }
3234 off = -1;
3235 switch (method) {
3236 case lt_amg:
3237 case le_amg:
3238 case gt_amg:
3239 case ge_amg:
3240 case eq_amg:
3241 case ne_amg:
2ab54efd
MB		 3242 off = ncmp_amg;
3243 break;
a0d0e21e
LW		 3244 case slt_amg:
3245 case sle_amg:
3246 case sgt_amg:
3247 case sge_amg:
3248 case seq_amg:
3249 case sne_amg:
2ab54efd
MB		 3250 off = scmp_amg;
3251 break;
a0d0e21e 3252 }
bf5522a1
MB		 3253 if (off != -1) {
3254 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3255 cv = ocvp[off];
3256 lr = -1;
3257 }
3258 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3259 cv = cvp[off];
3260 lr = 1;
3261 }
3262 }
3263 if (cv)
2ab54efd
MB		 3264 postpr = 1;
3265 else
3266 goto not_found;
a0d0e21e 3267 } else {
a6006777 3268 not_found: /* No method found, either report or croak */
b267980d
NIS		 3269 switch (method) {
3270 case to_sv_amg:
3271 case to_av_amg:
3272 case to_hv_amg:
3273 case to_gv_amg:
3274 case to_cv_amg:
3275 /* FAIL safe */
3276 return left; /* Delegate operation to standard mechanisms. */
b267980d 3277 }
a0d0e21e
LW		 3278 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3279 notfound = 1; lr = -1;
3280 } else if (cvp && (cv=cvp[nomethod_amg])) {
3281 notfound = 1; lr = 1;
bf5522a1
MB		 3282 } else if ((use_default_op =
3283 (!ocvp || oamtp->fallback >= AMGfallYES)
3284 && (!cvp || amtp->fallback >= AMGfallYES))
3285 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3286 /* Skip generating the "no method found" message. */
3287 return NULL;
a0d0e21e 3288 } else {
46fc3d4c 3289 SV *msg;
774d564b 3290 if (off==-1) off=method;
b267980d 3291 msg = sv_2mortal(Perl_newSVpvf(aTHX_
147e3846 3292 "Operation \"%s\": no method found,%sargument %s%" SVf "%s%" SVf,
d66cca07
BF		 3293 AMG_id2name(method + assignshift),
3294 (flags & AMGf_unary ? " " : "\n\tleft "),
3295 SvAMAGIC(left)?
3296 "in overloaded package ":
3297 "has no overloaded magic",
3298 SvAMAGIC(left)?
3299 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3300 SVfARG(&PL_sv_no),
3301 SvAMAGIC(right)?
3302 ",\n\tright argument in overloaded package ":
3303 (flags & AMGf_unary
3304 ? ""
3305 : ",\n\tright argument has no overloaded magic"),
3306 SvAMAGIC(right)?
3307 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3308 SVfARG(&PL_sv_no)));
bf5522a1 3309 if (use_default_op) {
147e3846 3310 DEBUG_o( Perl_deb(aTHX_ "%" SVf, SVfARG(msg)) );
a0d0e21e 3311 } else {
147e3846 3312 Perl_croak(aTHX_ "%" SVf, SVfARG(msg));
a0d0e21e
LW		 3313 }
3314 return NULL;
3315 }
ee239bfe 3316 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3317 }
3318 }
67288365
JL		 3319
3320 switch (method) {
3321 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3322 * operation. we need this to return a value, so that it can be assigned
3323 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3324 * increment or decrement was itself called in void context */
3325 case inc_amg:
3326 if (off == add_amg)
3327 force_scalar = 1;
3328 break;
3329 case dec_amg:
3330 if (off == subtr_amg)
3331 force_scalar = 1;
3332 break;
3333 /* in these cases, we're calling an assignment variant of an operator
3334 * (+= rather than +, for instance). regardless of whether it's a
3335 * fallback or not, it always has to return a value, which will be
3336 * assigned to the proper variable later */
3337 case add_amg:
3338 case subtr_amg:
3339 case mult_amg:
3340 case div_amg:
3341 case modulo_amg:
3342 case pow_amg:
3343 case lshift_amg:
3344 case rshift_amg:
3345 case repeat_amg:
3346 case concat_amg:
3347 case band_amg:
3348 case bor_amg:
3349 case bxor_amg:
6d06ecce
FC		 3350 case sband_amg:
3351 case sbor_amg:
3352 case sbxor_amg:
67288365
JL		 3353 if (assign)
3354 force_scalar = 1;
3355 break;
3356 /* the copy constructor always needs to return a value */
3357 case copy_amg:
3358 force_scalar = 1;
3359 break;
3360 /* because of the way these are implemented (they don't perform the
3361 * dereferencing themselves, they return a reference that perl then
3362 * dereferences later), they always have to be in scalar context */
3363 case to_sv_amg:
3364 case to_av_amg:
3365 case to_hv_amg:
3366 case to_gv_amg:
3367 case to_cv_amg:
3368 force_scalar = 1;
3369 break;
3370 /* these don't have an op of their own; they're triggered by their parent
3371 * op, so the context there isn't meaningful ('$a and foo()' in void
3372 * context still needs to pass scalar context on to $a's bool overload) */
3373 case bool__amg:
3374 case numer_amg:
3375 case string_amg:
3376 force_scalar = 1;
3377 break;
3378 }
3379
497b47a8 3380#ifdef DEBUGGING
a0d0e21e 3381 if (!notfound) {
497b47a8 3382 DEBUG_o(Perl_deb(aTHX_
147e3846 3383 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %" SVf "%s\n",
497b47a8
JH		 3384 AMG_id2name(off),
3385 method+assignshift==off? "" :
a0288114 3386 " (initially \"",
497b47a8
JH		 3387 method+assignshift==off? "" :
3388 AMG_id2name(method+assignshift),
a0288114 3389 method+assignshift==off? "" : "\")",
497b47a8
JH		 3390 flags & AMGf_unary? "" :
3391 lr==1 ? " for right argument": " for left argument",
3392 flags & AMGf_unary? " for argument" : "",
d66cca07 3393 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3394 fl? ",\n\tassignment variant used": "") );
ee239bfe 3395 }
497b47a8 3396#endif
748a9306
LW		 3397 /* Since we use shallow copy during assignment, we need
3398 * to dublicate the contents, probably calling user-supplied
3399 * version of copy operator
3400 */
ee239bfe
IZ		 3401 /* We need to copy in following cases:
3402 * a) Assignment form was called.
3403 * assignshift==1, assign==T, method + 1 == off
3404 * b) Increment or decrement, called directly.
3405 * assignshift==0, assign==0, method + 0 == off
3406 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3407 * assignshift==0, assign==T,
ee239bfe
IZ		 3408 * force_cpy == T
3409 * d) Increment or decrement, translated to nomethod.
b267980d 3410 * assignshift==0, assign==0,
ee239bfe
IZ		 3411 * force_cpy == T
3412 * e) Assignment form translated to nomethod.
3413 * assignshift==1, assign==T, method + 1 != off
3414 * force_cpy == T
3415 */
3416 /* off is method, method+assignshift, or a result of opcode substitution.
3417 * In the latter case assignshift==0, so only notfound case is important.
3418 */
73512201 3419 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3420 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3421 || force_cpy) )
6f1401dc 3422 {
1b38c28e
NC		 3423 /* newSVsv does not behave as advertised, so we copy missing
3424 * information by hand */
3425 SV *tmpRef = SvRV(left);
3426 SV *rv_copy;
31d632c3 3427 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3428 SvRV_set(left, rv_copy);
3429 SvSETMAGIC(left);
e7881358 3430 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3431 }
6f1401dc
DM		 3432 }
3433
a0d0e21e
LW		 3434 {
3435 dSP;
3436 BINOP myop;
3437 SV* res;
b7787f18 3438 const bool oldcatch = CATCH_GET;
67288365 3439 I32 oldmark, nret;
1c23e2bd 3440 U8 gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3441
54310121 3442 CATCH_SET(TRUE);
a0d0e21e
LW		 3443 Zero(&myop, 1, BINOP);
3444 myop.op_last = (OP *) &myop;
b37c2d43 3445 myop.op_next = NULL;
67288365
JL		 3446 myop.op_flags = OPf_STACKED;
3447
3448 switch (gimme) {
3449 case G_VOID:
3450 myop.op_flags |= OPf_WANT_VOID;
3451 break;
3452 case G_ARRAY:
3453 if (flags & AMGf_want_list) {
3454 myop.op_flags |= OPf_WANT_LIST;
3455 break;
3456 }
3457 /* FALLTHROUGH */
3458 default:
3459 myop.op_flags |= OPf_WANT_SCALAR;
3460 break;
3461 }
a0d0e21e 3462
e788e7d3 3463 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3464 ENTER;
462e5cf6 3465 SAVEOP();
533c011a 3466 PL_op = (OP *) &myop;
3280af22 3467 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3468 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3469 Perl_pp_pushmark(aTHX);
a0d0e21e 3470
924508f0 3471 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3472 PUSHs(lr>0? right: left);
3473 PUSHs(lr>0? left: right);
3280af22 3474 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3475 if (notfound) {
59cd0e26
NC		 3476 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3477 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3478 }
636ac8fc
FC		 3479 else if (flags & AMGf_numarg)
3480 PUSHs(&PL_sv_undef);
3481 if (flags & AMGf_numarg)
3482 PUSHs(&PL_sv_yes);
ad64d0ec 3483 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3484 PUTBACK;
67288365 3485 oldmark = TOPMARK;
a0d0e21e 3486
139d0ce6 3487 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3488 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3489 LEAVE;
3490 SPAGAIN;
67288365
JL		 3491 nret = SP - (PL_stack_base + oldmark);
3492
3493 switch (gimme) {
3494 case G_VOID:
3495 /* returning NULL has another meaning, and we check the context
3496 * at the call site too, so this can be differentiated from the
3497 * scalar case */
3498 res = &PL_sv_undef;
3499 SP = PL_stack_base + oldmark;
3500 break;
3501 case G_ARRAY: {
3502 if (flags & AMGf_want_list) {
3503 res = sv_2mortal((SV *)newAV());
3504 av_extend((AV *)res, nret);
3505 while (nret--)
3506 av_store((AV *)res, nret, POPs);
3507 break;
3508 }
3509 /* FALLTHROUGH */
3510 }
3511 default:
3512 res = POPs;
3513 break;
3514 }
a0d0e21e 3515
ebafeae7 3516 PUTBACK;
d3acc0f7 3517 POPSTACK;
54310121 3518 CATCH_SET(oldcatch);
a0d0e21e 3519
a0d0e21e 3520 if (postpr) {
b7787f18 3521 int ans;
a0d0e21e
LW		 3522 switch (method) {
3523 case le_amg:
3524 case sle_amg:
3525 ans=SvIV(res)<=0; break;
3526 case lt_amg:
3527 case slt_amg:
3528 ans=SvIV(res)<0; break;
3529 case ge_amg:
3530 case sge_amg:
3531 ans=SvIV(res)>=0; break;
3532 case gt_amg:
3533 case sgt_amg:
3534 ans=SvIV(res)>0; break;
3535 case eq_amg:
3536 case seq_amg:
3537 ans=SvIV(res)==0; break;
3538 case ne_amg:
3539 case sne_amg:
3540 ans=SvIV(res)!=0; break;
3541 case inc_amg:
3542 case dec_amg:
bbce6d69 3543 SvSetSV(left,res); return left;
dc437b57 3544 case not_amg:
fe7ac86a 3545 ans=!SvTRUE(res); break;
b7787f18
AL		 3546 default:
3547 ans=0; break;
a0d0e21e 3548 }
54310121 3549 return boolSV(ans);
748a9306
LW		 3550 } else if (method==copy_amg) {
3551 if (!SvROK(res)) {
cea2e8a9 3552 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3553 }
3554 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3555 } else {
3556 return res;
3557 }
3558 }
3559}
c9d5ac95 3560
f5c1e807
NC		 3561void
3562Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3563{
3564 dVAR;
acda4c6a 3565 U32 hash;
f5c1e807 3566
7918f24d 3567 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3568
acda4c6a 3569 if (len > I32_MAX)
147e3846 3570 Perl_croak(aTHX_ "panic: gv name too long (%" UVuf ")", (UV) len);
acda4c6a 3571
ae8cc45f
NC		 3572 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3573 unshare_hek(GvNAME_HEK(gv));
3574 }
3575
acda4c6a 3576 PERL_HASH(hash, name, len);
c60dbbc3 3577 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3578}
3579
66610fdd 3580/*
f7461760
Z		 3581=for apidoc gv_try_downgrade
3582
2867cdbc
Z		 3583If the typeglob C<gv> can be expressed more succinctly, by having
3584something other than a real GV in its place in the stash, replace it
3585with the optimised form. Basic requirements for this are that C<gv>
3586is a real typeglob, is sufficiently ordinary, and is only referenced
3587from its package. This function is meant to be used when a GV has been
3588looked up in part to see what was there, causing upgrading, but based
3589on what was found it turns out that the real GV isn't required after all.
3590
3591If C<gv> is a completely empty typeglob, it is deleted from the stash.
3592
3593If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3594sub, the typeglob is replaced with a scalar-reference placeholder that
3595more compactly represents the same thing.
f7461760
Z		 3596
3597=cut
3598*/
3599
3600void
3601Perl_gv_try_downgrade(pTHX_ GV *gv)
3602{
3603 HV *stash;
3604 CV *cv;
3605 HEK *namehek;
3606 SV **gvp;
3607 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3608
3609 /* XXX Why and where does this leave dangling pointers during global
3610 destruction? */
627364f1 3611 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3612
2867cdbc 3613 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3614 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3615 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3616 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3617 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3618 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3619 return;
2be08ad1
FC		 3620 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3621 return;
803f2748
DM		 3622 if (SvMAGICAL(gv)) {
3623 MAGIC *mg;
3624 /* only backref magic is allowed */
3625 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3626 return;
3627 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3628 if (mg->mg_type != PERL_MAGIC_backref)
3629 return;
3630 }
3631 }
2867cdbc
Z		 3632 cv = GvCV(gv);
3633 if (!cv) {
3634 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3635 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3636 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3637 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3638 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3639 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3640 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3641 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3642 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3643 *gvp == (SV*)gv) {
3644 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3645 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3646 SvREFCNT(gv) = 0;
3647 sv_clear((SV*)gv);
3648 SvREFCNT(gv) = 1;
70e5f2b5 3649 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3650
3651 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3652 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3653 STRUCT_OFFSET(XPVIV, xiv_iv));
3654 SvRV_set(gv, value);
3655 }
3656}
3657
9e3fb20c
FC		 3658GV *
3659Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3660{
3661 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3662 GV * const *gvp;
3663 PERL_ARGS_ASSERT_GV_OVERRIDE;
3664 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3665 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3666 gv = gvp ? *gvp : NULL;
3667 if (gv && !isGV(gv)) {
3668 if (!SvPCS_IMPORTED(gv)) return NULL;
3669 gv_init(gv, PL_globalstash, name, len, 0);
3670 return gv;
3671 }
3672 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3673}
3674
4aaa4757
FC		 3675#include "XSUB.h"
3676
3677static void
3678core_xsub(pTHX_ CV* cv)
3679{
3680 Perl_croak(aTHX_
3681 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3682 );
3683}
3684
f7461760 3685/*
14d04a33 3686 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3687 */
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