This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
https://perl5.git.perl.org / perl5.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
perldiag: Document unknown OA_* panic
[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
87 && strnEQ(GvNAME(gv), "ISA", 3))
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
FC		 535 case KEY_lstat:
536 case KEY_pop:
537 case KEY_push:
538 case KEY_shift:
a99f2ca2 539 case KEY_splice: case KEY_split:
0f8d4b5e
FC		 540 case KEY_stat:
541 case KEY_system:
542 case KEY_truncate: case KEY_unlink:
543 case KEY_unshift:
0f8d4b5e
FC		 544 ampable = FALSE;
545 }
546 if (!gv) {
547 gv = (GV *)newSV(0);
548 gv_init(gv, stash, name, len, TRUE);
549 }
7e68c38b 550 GvMULTI_on(gv);
0f8d4b5e
FC		 551 if (ampable) {
552 ENTER;
553 oldcurcop = PL_curcop;
554 oldparser = PL_parser;
555 lex_start(NULL, NULL, 0);
556 oldcompcv = PL_compcv;
557 PL_compcv = NULL; /* Prevent start_subparse from setting
558 CvOUTSIDE. */
559 oldsavestack_ix = start_subparse(FALSE,0);
560 cv = PL_compcv;
561 }
562 else {
563 /* Avoid calling newXS, as it calls us, and things start to
564 get hairy. */
565 cv = MUTABLE_CV(newSV_type(SVt_PVCV));
566 GvCV_set(gv,cv);
567 GvCVGEN(gv) = 0;
0f8d4b5e
FC		 568 CvISXSUB_on(cv);
569 CvXSUB(cv) = core_xsub;
eacbb379 570 PoisonPADLIST(cv);
0f8d4b5e
FC		 571 }
572 CvGV_set(cv, gv); /* This stops new ATTRSUB from setting CvFILE
573 from PL_curcop. */
9b669ea1
DD		 574 /* XSUBs can't be perl lang/perl5db.pl debugged
575 if (PERLDB_LINE_OR_SAVESRC)
576 (void)gv_fetchfile(file); */
0f8d4b5e
FC		 577 CvFILE(cv) = (char *)file;
578 /* XXX This is inefficient, as doing things this order causes
579 a prototype check in newATTRSUB. But we have to do
580 it this order as we need an op number before calling
581 new ATTRSUB. */
582 (void)core_prototype((SV *)cv, name, code, &opnum);
87566176 583 if (stash)
73c02f15 584 (void)hv_store(stash,name,len,(SV *)gv,0);
0f8d4b5e 585 if (ampable) {
4428fb0e
TC		 586#ifdef DEBUGGING
587 CV *orig_cv = cv;
588#endif
0f8d4b5e 589 CvLVALUE_on(cv);
4428fb0e
TC		 590 /* newATTRSUB will free the CV and return NULL if we're still
591 compiling after a syntax error */
e8f91c91 592 if ((cv = newATTRSUB_x(
7e68c38b 593 oldsavestack_ix, (OP *)gv,
0f8d4b5e
FC		 594 NULL,NULL,
595 coresub_op(
596 opnum
597 ? newSVuv((UV)opnum)
598 : newSVpvn(name,len),
599 code, opnum
7e68c38b 600 ),
e8f91c91 601 TRUE
4428fb0e
TC		 602 )) != NULL) {
603 assert(GvCV(gv) == orig_cv);
604 if (opnum != OP_VEC && opnum != OP_SUBSTR && opnum != OP_POS
605 && opnum != OP_UNDEF)
606 CvLVALUE_off(cv); /* Now *that* was a neat trick. */
607 }
0f8d4b5e
FC		 608 LEAVE;
609 PL_parser = oldparser;
610 PL_curcop = oldcurcop;
611 PL_compcv = oldcompcv;
612 }
4428fb0e
TC		 613 if (cv) {
614 SV *opnumsv = opnum ? newSVuv((UV)opnum) : (SV *)NULL;
615 cv_set_call_checker(
616 cv, Perl_ck_entersub_args_core, opnumsv ? opnumsv : (SV *)cv
617 );
618 SvREFCNT_dec(opnumsv);
619 }
620
0f8d4b5e
FC		 621 return gv;
622}
623
954c1994 624/*
6c53d59b
FC		 625=for apidoc gv_fetchmeth
626
627Like L</gv_fetchmeth_pvn>, but lacks a flags parameter.
628
e6919483
BF		 629=for apidoc gv_fetchmeth_sv
630
631Exactly like L</gv_fetchmeth_pvn>, but takes the name string in the form
632of an SV instead of a string/length pair.
633
634=cut
635*/
636
637GV *
638Perl_gv_fetchmeth_sv(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
639{
c290e187 640 char *namepv;
641 STRLEN namelen;
642 PERL_ARGS_ASSERT_GV_FETCHMETH_SV;
643 if (LIKELY(SvPOK_nog(namesv))) /* common case */
644 return gv_fetchmeth_internal(stash, namesv, NULL, 0, level, flags);
645 namepv = SvPV(namesv, namelen);
646 if (SvUTF8(namesv)) flags |= SVf_UTF8;
647 return gv_fetchmeth_pvn(stash, namepv, namelen, level, flags);
e6919483
BF		 648}
649
650/*
651=for apidoc gv_fetchmeth_pv
652
653Exactly like L</gv_fetchmeth_pvn>, but takes a nul-terminated string
654instead of a string/length pair.
655
656=cut
657*/
658
659GV *
660Perl_gv_fetchmeth_pv(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
661{
662 PERL_ARGS_ASSERT_GV_FETCHMETH_PV;
c6afe666 663 return gv_fetchmeth_internal(stash, NULL, name, strlen(name), level, flags);
e6919483
BF		 664}
665
666/*
667=for apidoc gv_fetchmeth_pvn
954c1994
GS		 668
669Returns the glob with the given C<name> and a defined subroutine or
670C<NULL>. The glob lives in the given C<stash>, or in the stashes
796b6530 671accessible via C<@ISA> and C<UNIVERSAL::>.
954c1994
GS		 672
673The argument C<level> should be either 0 or -1. If C<level==0>, as a
674side-effect creates a glob with the given C<name> in the given C<stash>
675which in the case of success contains an alias for the subroutine, and sets
e1a479c5 676up caching info for this glob.
954c1994 677
796b6530 678The only significant values for C<flags> are C<GV_SUPER> and C<SVf_UTF8>.
aae43805 679
796b6530 680C<GV_SUPER> indicates that we want to look up the method in the superclasses
aae43805 681of the C<stash>.
e6919483 682
aae43805 683The
954c1994 684GV returned from C<gv_fetchmeth> may be a method cache entry, which is not
4929bf7b 685visible to Perl code. So when calling C<call_sv>, you should not use
954c1994 686the GV directly; instead, you should use the method's CV, which can be
b267980d 687obtained from the GV with the C<GvCV> macro.
954c1994
GS		 688
689=cut
690*/
691
e1a479c5
BB		 692/* NOTE: No support for tied ISA */
693
c6afe666 694PERL_STATIC_INLINE GV*
695S_gv_fetchmeth_internal(pTHX_ HV* stash, SV* meth, const char* name, STRLEN len, I32 level, U32 flags)
79072805 696{
463ee0b2 697 GV** gvp;
c6afe666 698 HE* he;
e1a479c5
BB		 699 AV* linear_av;
700 SV** linear_svp;
701 SV* linear_sv;
aae43805 702 HV* cstash, *cachestash;
e1a479c5
BB		 703 GV* candidate = NULL;
704 CV* cand_cv = NULL;
e1a479c5 705 GV* topgv = NULL;
bfcb3514 706 const char *hvname;
c6afe666 707 I32 create = (level >= 0) ? HV_FETCH_LVALUE : 0;
e1a479c5 708 I32 items;
e1a479c5 709 U32 topgen_cmp;
04f3bf56 710 U32 is_utf8 = flags & SVf_UTF8;
a0d0e21e 711
af09ea45
IK		 712 /* UNIVERSAL methods should be callable without a stash */
713 if (!stash) {
e1a479c5 714 create = 0; /* probably appropriate */
da51bb9b 715 if(!(stash = gv_stashpvs("UNIVERSAL", 0)))
af09ea45
IK		 716 return 0;
717 }
718
e1a479c5
BB		 719 assert(stash);
720
bfcb3514
NC		 721 hvname = HvNAME_get(stash);
722 if (!hvname)
e1a479c5 723 Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
e27ad1f2 724
e1a479c5 725 assert(hvname);
55df6700 726 assert(name || meth);
463ee0b2 727
aae43805 728 DEBUG_o( Perl_deb(aTHX_ "Looking for %smethod %s in package %s\n",
55df6700
FC		 729 flags & GV_SUPER ? "SUPER " : "",
730 name ? name : SvPV_nolen(meth), hvname) );
44a8e56a 731
dd69841b 732 topgen_cmp = HvMROMETA(stash)->cache_gen + PL_sub_generation;
e1a479c5 733
aae43805 734 if (flags & GV_SUPER) {
1a33a059
FC		 735 if (!HvAUX(stash)->xhv_mro_meta->super)
736 HvAUX(stash)->xhv_mro_meta->super = newHV();
737 cachestash = HvAUX(stash)->xhv_mro_meta->super;
aae43805
FC		 738 }
739 else cachestash = stash;
740
e1a479c5 741 /* check locally for a real method or a cache entry */
c6afe666 742 he = (HE*)hv_common(
743 cachestash, meth, name, len, (flags & SVf_UTF8) ? HVhek_UTF8 : 0, create, NULL, 0
744 );
745 if (he) gvp = (GV**)&HeVAL(he);
746 else gvp = NULL;
747
e1a479c5
BB		 748 if(gvp) {
749 topgv = *gvp;
0f8d4b5e 750 have_gv:
e1a479c5
BB		 751 assert(topgv);
752 if (SvTYPE(topgv) != SVt_PVGV)
55df6700
FC		 753 {
754 if (!name)
755 name = SvPV_nomg(meth, len);
04ec7e59 756 gv_init_pvn(topgv, stash, name, len, GV_ADDMULTI|is_utf8);
55df6700 757 }
e1a479c5
BB		 758 if ((cand_cv = GvCV(topgv))) {
759 /* If genuine method or valid cache entry, use it */
760 if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) {
761 return topgv;
762 }
763 else {
764 /* stale cache entry, junk it and move on */
e7881358 765 SvREFCNT_dec_NN(cand_cv);
c43ae56f
DM		 766 GvCV_set(topgv, NULL);
767 cand_cv = NULL;
e1a479c5
BB		 768 GvCVGEN(topgv) = 0;
769 }
770 }
771 else if (GvCVGEN(topgv) == topgen_cmp) {
772 /* cache indicates no such method definitively */
773 return 0;
774 }
aae43805
FC		 775 else if (stash == cachestash
776 && len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4
0f8d4b5e 777 && strnEQ(hvname, "CORE", 4)
87566176 778 && S_maybe_add_coresub(aTHX_ NULL,topgv,name,len))
0f8d4b5e 779 goto have_gv;
463ee0b2 780 }
79072805 781
aae43805 782 linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */
e1a479c5
BB		 783 linear_svp = AvARRAY(linear_av) + 1; /* skip over self */
784 items = AvFILLp(linear_av); /* no +1, to skip over self */
785 while (items--) {
786 linear_sv = *linear_svp++;
787 assert(linear_sv);
788 cstash = gv_stashsv(linear_sv, 0);
789
dd69841b 790 if (!cstash) {
ecad31f0 791 Perl_ck_warner(aTHX_ packWARN(WARN_SYNTAX),
d0c0e7dd 792 "Can't locate package %"SVf" for @%"HEKf"::ISA",
ecad31f0 793 SVfARG(linear_sv),
d0c0e7dd 794 HEKfARG(HvNAME_HEK(stash)));
e1a479c5
BB		 795 continue;
796 }
9607fc9c 797
e1a479c5
BB		 798 assert(cstash);
799
c60dbbc3 800 gvp = (GV**)hv_fetch(cstash, name, is_utf8 ? -(I32)len : (I32)len, 0);
0f8d4b5e
FC		 801 if (!gvp) {
802 if (len > 1 && HvNAMELEN_get(cstash) == 4) {
803 const char *hvname = HvNAME(cstash); assert(hvname);
804 if (strnEQ(hvname, "CORE", 4)
805 && (candidate =
87566176 806 S_maybe_add_coresub(aTHX_ cstash,NULL,name,len)
0f8d4b5e
FC		 807 ))
808 goto have_candidate;
809 }
810 continue;
811 }
812 else candidate = *gvp;
813 have_candidate:
e1a479c5 814 assert(candidate);
04f3bf56 815 if (SvTYPE(candidate) != SVt_PVGV)
04ec7e59 816 gv_init_pvn(candidate, cstash, name, len, GV_ADDMULTI|is_utf8);
e1a479c5
BB		 817 if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
818 /*
819 * Found real method, cache method in topgv if:
820 * 1. topgv has no synonyms (else inheritance crosses wires)
821 * 2. method isn't a stub (else AUTOLOAD fails spectacularly)
822 */
823 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 824 CV *old_cv = GvCV(topgv);
825 SvREFCNT_dec(old_cv);
e1a479c5 826 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 827 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 828 GvCVGEN(topgv) = topgen_cmp;
829 }
830 return candidate;
831 }
832 }
9607fc9c 833
e1a479c5
BB		 834 /* Check UNIVERSAL without caching */
835 if(level == 0 || level == -1) {
55df6700
FC		 836 candidate = gv_fetchmeth_internal(NULL, meth, name, len, 1,
837 flags &~GV_SUPER);
e1a479c5
BB		 838 if(candidate) {
839 cand_cv = GvCV(candidate);
840 if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) {
9bfbb681
VP		 841 CV *old_cv = GvCV(topgv);
842 SvREFCNT_dec(old_cv);
e1a479c5 843 SvREFCNT_inc_simple_void_NN(cand_cv);
c43ae56f 844 GvCV_set(topgv, cand_cv);
e1a479c5
BB		 845 GvCVGEN(topgv) = topgen_cmp;
846 }
847 return candidate;
848 }
849 }
850
851 if (topgv && GvREFCNT(topgv) == 1) {
852 /* cache the fact that the method is not defined */
853 GvCVGEN(topgv) = topgen_cmp;
a0d0e21e
LW		 854 }
855
79072805
LW		 856 return 0;
857}
858
c6afe666 859GV *
860Perl_gv_fetchmeth_pvn(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
861{
862 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN;
863 return gv_fetchmeth_internal(stash, NULL, name, len, level, flags);
864}
865
954c1994 866/*
460e5730
FC		 867=for apidoc gv_fetchmeth_autoload
868
869This is the old form of L</gv_fetchmeth_pvn_autoload>, which has no flags
870parameter.
871
d21989ed 872=for apidoc gv_fetchmeth_sv_autoload
611c1e95 873
d21989ed
BF		 874Exactly like L</gv_fetchmeth_pvn_autoload>, but takes the name string in the form
875of an SV instead of a string/length pair.
876
877=cut
878*/
879
880GV *
881Perl_gv_fetchmeth_sv_autoload(pTHX_ HV *stash, SV *namesv, I32 level, U32 flags)
882{
883 char *namepv;
884 STRLEN namelen;
885 PERL_ARGS_ASSERT_GV_FETCHMETH_SV_AUTOLOAD;
886 namepv = SvPV(namesv, namelen);
887 if (SvUTF8(namesv))
888 flags |= SVf_UTF8;
889 return gv_fetchmeth_pvn_autoload(stash, namepv, namelen, level, flags);
890}
891
892/*
893=for apidoc gv_fetchmeth_pv_autoload
894
895Exactly like L</gv_fetchmeth_pvn_autoload>, but takes a nul-terminated string
896instead of a string/length pair.
897
898=cut
899*/
900
901GV *
902Perl_gv_fetchmeth_pv_autoload(pTHX_ HV *stash, const char *name, I32 level, U32 flags)
903{
904 PERL_ARGS_ASSERT_GV_FETCHMETH_PV_AUTOLOAD;
905 return gv_fetchmeth_pvn_autoload(stash, name, strlen(name), level, flags);
906}
907
908/*
909=for apidoc gv_fetchmeth_pvn_autoload
910
796b6530 911Same as C<gv_fetchmeth_pvn()>, but looks for autoloaded subroutines too.
611c1e95
IZ		 912Returns a glob for the subroutine.
913
914For an autoloaded subroutine without a GV, will create a GV even
796b6530 915if C<level < 0>. For an autoloaded subroutine without a stub, C<GvCV()>
611c1e95
IZ		 916of the result may be zero.
917
796b6530 918Currently, the only significant value for C<flags> is C<SVf_UTF8>.
d21989ed 919
611c1e95
IZ		 920=cut
921*/
922
923GV *
d21989ed 924Perl_gv_fetchmeth_pvn_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level, U32 flags)
611c1e95 925{
499321d3 926 GV *gv = gv_fetchmeth_pvn(stash, name, len, level, flags);
611c1e95 927
d21989ed 928 PERL_ARGS_ASSERT_GV_FETCHMETH_PVN_AUTOLOAD;
7918f24d 929
611c1e95 930 if (!gv) {
611c1e95
IZ		 931 CV *cv;
932 GV **gvp;
933
934 if (!stash)
6136c704 935 return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */
7edbdc6b 936 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
6136c704 937 return NULL;
d21989ed 938 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE, flags)))
6136c704 939 return NULL;
611c1e95
IZ		 940 cv = GvCV(gv);
941 if (!(CvROOT(cv) || CvXSUB(cv)))
6136c704 942 return NULL;
611c1e95
IZ		 943 /* Have an autoload */
944 if (level < 0) /* Cannot do without a stub */
d21989ed 945 gv_fetchmeth_pvn(stash, name, len, 0, flags);
c60dbbc3
BF		 946 gvp = (GV**)hv_fetch(stash, name,
947 (flags & SVf_UTF8) ? -(I32)len : (I32)len, (level >= 0));
611c1e95 948 if (!gvp)
6136c704 949 return NULL;
611c1e95
IZ		 950 return *gvp;
951 }
952 return gv;
953}
954
955/*
954c1994
GS		 956=for apidoc gv_fetchmethod_autoload
957
958Returns the glob which contains the subroutine to call to invoke the method
959on the C<stash>. In fact in the presence of autoloading this may be the
796b6530 960glob for "AUTOLOAD". In this case the corresponding variable C<$AUTOLOAD> is
b267980d 961already setup.
954c1994
GS		 962
963The third parameter of C<gv_fetchmethod_autoload> determines whether
964AUTOLOAD lookup is performed if the given method is not present: non-zero
b267980d 965means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD.
954c1994 966Calling C<gv_fetchmethod> is equivalent to calling C<gv_fetchmethod_autoload>
b267980d 967with a non-zero C<autoload> parameter.
954c1994 968
cec2d7b1
FC		 969These functions grant C<"SUPER"> token
970as a prefix of the method name. Note
954c1994
GS		 971that if you want to keep the returned glob for a long time, you need to
972check for it being "AUTOLOAD", since at the later time the call may load a
796b6530 973different subroutine due to C<$AUTOLOAD> changing its value. Use the glob
cec2d7b1 974created as a side effect to do this.
954c1994 975
cec2d7b1
FC		 976These functions have the same side-effects as C<gv_fetchmeth> with
977C<level==0>. The warning against passing the GV returned by
978C<gv_fetchmeth> to C<call_sv> applies equally to these functions.
954c1994
GS		 979
980=cut
981*/
982
dc848c6f 983GV *
864dbfa3 984Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload)
dc848c6f 985{
547bb267
NC		 986 PERL_ARGS_ASSERT_GV_FETCHMETHOD_AUTOLOAD;
987
256d1bb2
NC		 988 return gv_fetchmethod_flags(stash, name, autoload ? GV_AUTOLOAD : 0);
989}
990
44130a26
BF		 991GV *
992Perl_gv_fetchmethod_sv_flags(pTHX_ HV *stash, SV *namesv, U32 flags)
993{
994 char *namepv;
995 STRLEN namelen;
996 PERL_ARGS_ASSERT_GV_FETCHMETHOD_SV_FLAGS;
997 namepv = SvPV(namesv, namelen);
998 if (SvUTF8(namesv))
999 flags |= SVf_UTF8;
1000 return gv_fetchmethod_pvn_flags(stash, namepv, namelen, flags);
1001}
1002
1003GV *
1004Perl_gv_fetchmethod_pv_flags(pTHX_ HV *stash, const char *name, U32 flags)
1005{
1006 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PV_FLAGS;
1007 return gv_fetchmethod_pvn_flags(stash, name, strlen(name), flags);
1008}
1009
256d1bb2
NC		 1010/* Don't merge this yet, as it's likely to get a len parameter, and possibly
1011 even a U32 hash */
1012GV *
44130a26 1013Perl_gv_fetchmethod_pvn_flags(pTHX_ HV *stash, const char *name, const STRLEN len, U32 flags)
256d1bb2 1014{
eb578fdb 1015 const char *nend;
c445ea15 1016 const char *nsplit = NULL;
a0d0e21e 1017 GV* gv;
0dae17bd 1018 HV* ostash = stash;
c94593d0 1019 const char * const origname = name;
ad64d0ec 1020 SV *const error_report = MUTABLE_SV(stash);
256d1bb2
NC		 1021 const U32 autoload = flags & GV_AUTOLOAD;
1022 const U32 do_croak = flags & GV_CROAK;
14d1dfbd 1023 const U32 is_utf8 = flags & SVf_UTF8;
0dae17bd 1024
44130a26 1025 PERL_ARGS_ASSERT_GV_FETCHMETHOD_PVN_FLAGS;
7918f24d 1026
eff494dd 1027 if (SvTYPE(stash) < SVt_PVHV)
5c284bb0 1028 stash = NULL;
c9bf4021
NC		 1029 else {
1030 /* The only way stash can become NULL later on is if nsplit is set,
1031 which in turn means that there is no need for a SVt_PVHV case
1032 the error reporting code. */
1033 }
b267980d 1034
44130a26 1035 for (nend = name; *nend || nend != (origname + len); nend++) {
c94593d0 1036 if (*nend == '\'') {
a0d0e21e 1037 nsplit = nend;
c94593d0
NC		 1038 name = nend + 1;
1039 }
1040 else if (*nend == ':' && *(nend + 1) == ':') {
1041 nsplit = nend++;
1042 name = nend + 1;
1043 }
a0d0e21e
LW		 1044 }
1045 if (nsplit) {
7edbdc6b 1046 if ((nsplit - origname) == 5 && memEQ(origname, "SUPER", 5)) {
9607fc9c 1047 /* ->SUPER::method should really be looked up in original stash */
aae43805
FC		 1048 stash = CopSTASH(PL_curcop);
1049 flags |= GV_SUPER;
cea2e8a9 1050 DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n",
0308a534 1051 origname, HvENAME_get(stash), name) );
4633a7c4 1052 }
aae43805
FC		 1053 else if ((nsplit - origname) >= 7 &&
1054 strnEQ(nsplit - 7, "::SUPER", 7)) {
1055 /* don't autovifify if ->NoSuchStash::SUPER::method */
1056 stash = gv_stashpvn(origname, nsplit - origname - 7, is_utf8);
1057 if (stash) flags |= GV_SUPER;
1058 }
e189a56d 1059 else {
af09ea45 1060 /* don't autovifify if ->NoSuchStash::method */
14d1dfbd 1061 stash = gv_stashpvn(origname, nsplit - origname, is_utf8);
e189a56d 1062 }
0dae17bd 1063 ostash = stash;
4633a7c4
LW		 1064 }
1065
14d1dfbd 1066 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
a0d0e21e 1067 if (!gv) {
2f6e0fe7 1068 if (strEQ(name,"import") || strEQ(name,"unimport"))
159b6efe 1069 gv = MUTABLE_GV(&PL_sv_yes);
dc848c6f 1070 else if (autoload)
c8416c26
BF		 1071 gv = gv_autoload_pvn(
1072 ostash, name, nend - name, GV_AUTOLOAD_ISMETHOD|flags
1073 );
256d1bb2
NC		 1074 if (!gv && do_croak) {
1075 /* Right now this is exclusively for the benefit of S_method_common
1076 in pp_hot.c */
1077 if (stash) {
15e6cdd9
DG		 1078 /* If we can't find an IO::File method, it might be a call on
1079 * a filehandle. If IO:File has not been loaded, try to
1080 * require it first instead of croaking */
1081 const char *stash_name = HvNAME_get(stash);
31b05a0f
FR		 1082 if (stash_name && memEQs(stash_name, HvNAMELEN_get(stash), "IO::File")
1083 && !Perl_hv_common(aTHX_ GvHVn(PL_incgv), NULL,
1084 STR_WITH_LEN("IO/File.pm"), 0,
1085 HV_FETCH_ISEXISTS, NULL, 0)
15e6cdd9 1086 ) {
31b05a0f 1087 require_pv("IO/File.pm");
14d1dfbd 1088 gv = gv_fetchmeth_pvn(stash, name, nend - name, 0, flags);
15e6cdd9
DG		 1089 if (gv)
1090 return gv;
1091 }
256d1bb2 1092 Perl_croak(aTHX_
b17a0679 1093 "Can't locate object method \"%"UTF8f
d0c0e7dd 1094 "\" via package \"%"HEKf"\"",
b17a0679 1095 UTF8fARG(is_utf8, nend - name, name),
d0c0e7dd 1096 HEKfARG(HvNAME_HEK(stash)));
256d1bb2
NC		 1097 }
1098 else {
ecad31f0 1099 SV* packnamesv;
256d1bb2 1100
256d1bb2 1101 if (nsplit) {
ecad31f0
BF		 1102 packnamesv = newSVpvn_flags(origname, nsplit - origname,
1103 SVs_TEMP | is_utf8);
256d1bb2 1104 } else {
017c5e4e 1105 packnamesv = error_report;
256d1bb2
NC		 1106 }
1107
1108 Perl_croak(aTHX_
b17a0679
FC		 1109 "Can't locate object method \"%"UTF8f
1110 "\" via package \"%"SVf"\""
ecad31f0 1111 " (perhaps you forgot to load \"%"SVf"\"?)",
b17a0679 1112 UTF8fARG(is_utf8, nend - name, name),
ecad31f0 1113 SVfARG(packnamesv), SVfARG(packnamesv));
256d1bb2
NC		 1114 }
1115 }
463ee0b2 1116 }
dc848c6f 1117 else if (autoload) {
9d4ba2ae 1118 CV* const cv = GvCV(gv);
09280a33
CS		 1119 if (!CvROOT(cv) && !CvXSUB(cv)) {
1120 GV* stubgv;
1121 GV* autogv;
1122
0c028dca 1123 if (CvANON(cv) || CvLEXICAL(cv))
09280a33
CS		 1124 stubgv = gv;
1125 else {
1126 stubgv = CvGV(cv);
1127 if (GvCV(stubgv) != cv) /* orphaned import */
1128 stubgv = gv;
1129 }
c8416c26
BF		 1130 autogv = gv_autoload_pvn(GvSTASH(stubgv),
1131 GvNAME(stubgv), GvNAMELEN(stubgv),
1132 GV_AUTOLOAD_ISMETHOD
1133 | (GvNAMEUTF8(stubgv) ? SVf_UTF8 : 0));
dc848c6f 1134 if (autogv)
1135 gv = autogv;
1136 }
1137 }
44a8e56a 1138
1139 return gv;
1140}
1141
1142GV*
0eeb01b9 1143Perl_gv_autoload_sv(pTHX_ HV *stash, SV* namesv, U32 flags)
5fba3c91
BF		 1144{
1145 char *namepv;
1146 STRLEN namelen;
0fe84f7c 1147 PERL_ARGS_ASSERT_GV_AUTOLOAD_SV;
5fba3c91
BF		 1148 namepv = SvPV(namesv, namelen);
1149 if (SvUTF8(namesv))
1150 flags |= SVf_UTF8;
0eeb01b9 1151 return gv_autoload_pvn(stash, namepv, namelen, flags);
5fba3c91
BF		 1152}
1153
1154GV*
0eeb01b9 1155Perl_gv_autoload_pv(pTHX_ HV *stash, const char *namepv, U32 flags)
5fba3c91 1156{
0fe84f7c 1157 PERL_ARGS_ASSERT_GV_AUTOLOAD_PV;
0eeb01b9 1158 return gv_autoload_pvn(stash, namepv, strlen(namepv), flags);
5fba3c91
BF		 1159}
1160
1161GV*
0eeb01b9 1162Perl_gv_autoload_pvn(pTHX_ HV *stash, const char *name, STRLEN len, U32 flags)
44a8e56a 1163{
44a8e56a 1164 GV* gv;
1165 CV* cv;
1166 HV* varstash;
1167 GV* vargv;
1168 SV* varsv;
c8416c26
BF		 1169 SV *packname = NULL;
1170 U32 is_utf8 = flags & SVf_UTF8 ? SVf_UTF8 : 0;
44a8e56a 1171
0fe84f7c 1172 PERL_ARGS_ASSERT_GV_AUTOLOAD_PVN;
7918f24d 1173
7edbdc6b 1174 if (len == S_autolen && memEQ(name, S_autoload, S_autolen))
a0714e2c 1175 return NULL;
0dae17bd
GS		 1176 if (stash) {
1177 if (SvTYPE(stash) < SVt_PVHV) {
c8416c26
BF		 1178 STRLEN packname_len = 0;
1179 const char * const packname_ptr = SvPV_const(MUTABLE_SV(stash), packname_len);
1180 packname = newSVpvn_flags(packname_ptr, packname_len,
1181 SVs_TEMP | SvUTF8(stash));
5c284bb0 1182 stash = NULL;
0dae17bd 1183 }
c8416c26
BF		 1184 else
1185 packname = sv_2mortal(newSVhek(HvNAME_HEK(stash)));
aae43805 1186 if (flags & GV_SUPER) sv_catpvs(packname, "::SUPER");
0dae17bd 1187 }
257dc59d
FC		 1188 if (!(gv = gv_fetchmeth_pvn(stash, S_autoload, S_autolen, FALSE,
1189 is_utf8 | (flags & GV_SUPER))))
a0714e2c 1190 return NULL;
dc848c6f 1191 cv = GvCV(gv);
1192
adb5a9ae 1193 if (!(CvROOT(cv) || CvXSUB(cv)))
a0714e2c 1194 return NULL;
ed850460 1195
dc848c6f 1196 /*
1197 * Inheriting AUTOLOAD for non-methods works ... for now.
1198 */
0eeb01b9
FC		 1199 if (
1200 !(flags & GV_AUTOLOAD_ISMETHOD)
1201 && (GvCVGEN(gv) || GvSTASH(gv) != stash)
041457d9 1202 )
d1d15184 1203 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
b17a0679
FC		 1204 "Use of inherited AUTOLOAD for non-method %"SVf
1205 "::%"UTF8f"() is deprecated",
ecad31f0 1206 SVfARG(packname),
b17a0679 1207 UTF8fARG(is_utf8, len, name));
44a8e56a 1208
aed2304a 1209 if (CvISXSUB(cv)) {
bb619f37
FC		 1210 /* Instead of forcing the XSUB do another lookup for $AUTOLOAD
1211 * and split that value on the last '::', pass along the same data
1212 * via the SvPVX field in the CV, and the stash in CvSTASH.
8fa6a409
FC		 1213 *
1214 * Due to an unfortunate accident of history, the SvPVX field
e1fa07e3 1215 * serves two purposes. It is also used for the subroutine's pro-
8fa6a409
FC		 1216 * type. Since SvPVX has been documented as returning the sub name
1217 * for a long time, but not as returning the prototype, we have
1218 * to preserve the SvPVX AUTOLOAD behaviour and put the prototype
1219 * elsewhere.
1220 *
1221 * We put the prototype in the same allocated buffer, but after
1222 * the sub name. The SvPOK flag indicates the presence of a proto-
1223 * type. The CvAUTOLOAD flag indicates the presence of a sub name.
1224 * If both flags are on, then SvLEN is used to indicate the end of
1225 * the prototype (artificially lower than what is actually allo-
1226 * cated), at the risk of having to reallocate a few bytes unneces-
1227 * sarily--but that should happen very rarely, if ever.
1228 *
1229 * We use SvUTF8 for both prototypes and sub names, so if one is
1230 * UTF8, the other must be upgraded.
adb5a9ae 1231 */
c68d9564 1232 CvSTASH_set(cv, stash);
8fa6a409 1233 if (SvPOK(cv)) { /* Ouch! */
e7881358 1234 SV * const tmpsv = newSVpvn_flags(name, len, is_utf8);
8fa6a409
FC		 1235 STRLEN ulen;
1236 const char *proto = CvPROTO(cv);
1237 assert(proto);
1238 if (SvUTF8(cv))
1239 sv_utf8_upgrade_flags_grow(tmpsv, 0, CvPROTOLEN(cv) + 2);
1240 ulen = SvCUR(tmpsv);
1241 SvCUR(tmpsv)++; /* include null in string */
1242 sv_catpvn_flags(
1243 tmpsv, proto, CvPROTOLEN(cv), SV_CATBYTES*!SvUTF8(cv)
1244 );
1245 SvTEMP_on(tmpsv); /* Allow theft */
1246 sv_setsv_nomg((SV *)cv, tmpsv);
05b525f4 1247 SvTEMP_off(tmpsv);
e7881358 1248 SvREFCNT_dec_NN(tmpsv);
8fa6a409
FC		 1249 SvLEN(cv) = SvCUR(cv) + 1;
1250 SvCUR(cv) = ulen;
1251 }
1252 else {
1253 sv_setpvn((SV *)cv, name, len);
1254 SvPOK_off(cv);
1255 if (is_utf8)
c8416c26 1256 SvUTF8_on(cv);
8fa6a409
FC		 1257 else SvUTF8_off(cv);
1258 }
1259 CvAUTOLOAD_on(cv);
adb5a9ae 1260 }
adb5a9ae 1261
44a8e56a 1262 /*
1263 * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name.
1264 * The subroutine's original name may not be "AUTOLOAD", so we don't
1265 * use that, but for lack of anything better we will use the sub's
1266 * original package to look up $AUTOLOAD.
1267 */
18691622 1268 varstash = CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv));
5c7983e5 1269 vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE);
3d35f11b
GS		 1270 ENTER;
1271
c69033f2 1272 if (!isGV(vargv)) {
04ec7e59 1273 gv_init_pvn(vargv, varstash, S_autoload, S_autolen, 0);
c69033f2 1274#ifdef PERL_DONT_CREATE_GVSV
561b68a9 1275 GvSV(vargv) = newSV(0);
c69033f2
NC		 1276#endif
1277 }
3d35f11b 1278 LEAVE;
e203899d 1279 varsv = GvSVn(vargv);
4bac9ae4
CS		 1280 SvTAINTED_off(varsv); /* previous $AUTOLOAD taint is obsolete */
1281 /* XXX: this process is not careful to avoid extra magic gets and sets; tied $AUTOLOAD will get noise */
c8416c26 1282 sv_setsv(varsv, packname);
396482e1 1283 sv_catpvs(varsv, "::");
d40bf27b
NC		 1284 /* Ensure SvSETMAGIC() is called if necessary. In particular, to clear
1285 tainting if $FOO::AUTOLOAD was previously tainted, but is not now. */
61a9130e
FC		 1286 sv_catpvn_flags(
1287 varsv, name, len,
5bcd1ef4 1288 SV_SMAGIC|(is_utf8 ? SV_CATUTF8 : SV_CATBYTES)
61a9130e 1289 );
c8416c26
BF		 1290 if (is_utf8)
1291 SvUTF8_on(varsv);
a0d0e21e
LW		 1292 return gv;
1293}
1294
44a2ac75
YO		 1295
1296/* require_tie_mod() internal routine for requiring a module
486ec47a 1297 * that implements the logic of automatic ties like %! and %-
44a2ac75
YO		 1298 *
1299 * The "gv" parameter should be the glob.
45cbc99a
RGS		 1300 * "varpv" holds the name of the var, used for error messages.
1301 * "namesv" holds the module name. Its refcount will be decremented.
44a2ac75 1302 * "methpv" holds the method name to test for to check that things
45cbc99a
RGS		 1303 * are working reasonably close to as expected.
1304 * "flags": if flag & 1 then save the scalar before loading.
44a2ac75
YO		 1305 * For the protection of $! to work (it is set by this routine)
1306 * the sv slot must already be magicalized.
d2c93421 1307 */
44a2ac75
YO		 1308STATIC HV*
1309S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags)
d2c93421 1310{
da51bb9b 1311 HV* stash = gv_stashsv(namesv, 0);
45cbc99a 1312
7918f24d
NC		 1313 PERL_ARGS_ASSERT_REQUIRE_TIE_MOD;
1314
0ea03996 1315 if (!stash || !(gv_fetchmethod_autoload(stash, methpv, FALSE))) {
45cbc99a
RGS		 1316 SV *module = newSVsv(namesv);
1317 char varname = *varpv; /* varpv might be clobbered by load_module,
1318 so save it. For the moment it's always
1319 a single char. */
b82b06b8 1320 const char type = varname == '[' ? '$' : '%';
61bac25c 1321#ifdef DEBUGGING
d2c93421 1322 dSP;
61bac25c 1323#endif
d2c93421 1324 ENTER;
600beb2e 1325 SAVEFREESV(namesv);
44a2ac75 1326 if ( flags & 1 )
45cbc99a
RGS		 1327 save_scalar(gv);
1328 Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL);
61bac25c 1329 assert(sp == PL_stack_sp);
da51bb9b 1330 stash = gv_stashsv(namesv, 0);
44a2ac75 1331 if (!stash)
b82b06b8
FC		 1332 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" is not available",
1333 type, varname, SVfARG(namesv));
45cbc99a 1334 else if (!gv_fetchmethod(stash, methpv))
b82b06b8
FC		 1335 Perl_croak(aTHX_ "panic: Can't use %c%c because %"SVf" does not support method %s",
1336 type, varname, SVfARG(namesv), methpv);
600beb2e 1337 LEAVE;
d2c93421 1338 }
e7881358 1339 else SvREFCNT_dec_NN(namesv);
44a2ac75 1340 return stash;
d2c93421
RH		 1341}
1342
954c1994
GS		 1343/*
1344=for apidoc gv_stashpv
1345
da51bb9b 1346Returns a pointer to the stash for a specified package. Uses C<strlen> to
75c442e4 1347determine the length of C<name>, then calls C<gv_stashpvn()>.
954c1994
GS		 1348
1349=cut
1350*/
1351
a0d0e21e 1352HV*
864dbfa3 1353Perl_gv_stashpv(pTHX_ const char *name, I32 create)
a0d0e21e 1354{
7918f24d 1355 PERL_ARGS_ASSERT_GV_STASHPV;
dc437b57 1356 return gv_stashpvn(name, strlen(name), create);
1357}
1358
bc96cb06
SH		 1359/*
1360=for apidoc gv_stashpvn
1361
da51bb9b
NC		 1362Returns a pointer to the stash for a specified package. The C<namelen>
1363parameter indicates the length of the C<name>, in bytes. C<flags> is passed
1364to C<gv_fetchpvn_flags()>, so if set to C<GV_ADD> then the package will be
1365created if it does not already exist. If the package does not exist and
796b6530 1366C<flags> is 0 (or any other setting that does not create packages) then C<NULL>
da51bb9b
NC		 1367is returned.
1368
566a4718
YO		 1369Flags may be one of:
1370
1371 GV_ADD
1372 SVf_UTF8
1373 GV_NOADD_NOINIT
1374 GV_NOINIT
1375 GV_NOEXPAND
1376 GV_ADDMG
1377
796b6530 1378The most important of which are probably C<GV_ADD> and C<SVf_UTF8>.
bc96cb06 1379
808724c8 1380Note, use of C<gv_stashsv> instead of C<gv_stashpvn> where possible is strongly
1381recommended for performance reasons.
1382
bc96cb06
SH		 1383=cut
1384*/
1385
0eadbdad
YO		 1386/*
1387gv_stashpvn_internal
1388
1389Perform the internal bits of gv_stashsvpvn_cached. You could think of this
1390as being one half of the logic. Not to be called except from gv_stashsvpvn_cached().
1391
1392*/
1393
4e7ebec5 1394PERL_STATIC_INLINE HV*
0eadbdad 1395S_gv_stashpvn_internal(pTHX_ const char *name, U32 namelen, I32 flags)
dc437b57 1396{
0cea0058 1397 char smallbuf[128];
46fc3d4c 1398 char *tmpbuf;
a0d0e21e
LW		 1399 HV *stash;
1400 GV *tmpgv;
add0ecde 1401 U32 tmplen = namelen + 2;
dc437b57 1402
0eadbdad 1403 PERL_ARGS_ASSERT_GV_STASHPVN_INTERNAL;
7918f24d 1404
add0ecde 1405 if (tmplen <= sizeof smallbuf)
46fc3d4c 1406 tmpbuf = smallbuf;
1407 else
add0ecde
VP		 1408 Newx(tmpbuf, tmplen, char);
1409 Copy(name, tmpbuf, namelen, char);
1410 tmpbuf[namelen] = ':';
1411 tmpbuf[namelen+1] = ':';
1412 tmpgv = gv_fetchpvn_flags(tmpbuf, tmplen, flags, SVt_PVHV);
46fc3d4c 1413 if (tmpbuf != smallbuf)
1414 Safefree(tmpbuf);
d2fcb1d6 1415 if (!tmpgv || !isGV_with_GP(tmpgv))
da51bb9b 1416 return NULL;
a0d0e21e 1417 stash = GvHV(tmpgv);
1f656fcf 1418 if (!(flags & ~GV_NOADD_MASK) && !stash) return NULL;
9efb5c72 1419 assert(stash);
1f656fcf 1420 if (!HvNAME_get(stash)) {
0be4d16f 1421 hv_name_set(stash, name, namelen, flags & SVf_UTF8 ? SVf_UTF8 : 0 );
1f656fcf
FC		 1422
1423 /* FIXME: This is a repeat of logic in gv_fetchpvn_flags */
1424 /* If the containing stash has multiple effective
1425 names, see that this one gets them, too. */
1426 if (HvAUX(GvSTASH(tmpgv))->xhv_name_count)
1427 mro_package_moved(stash, NULL, tmpgv, 1);
1428 }
a0d0e21e 1429 return stash;
463ee0b2
LW		 1430}
1431
808724c8 1432/*
1433gv_stashsvpvn_cached
1434
1435Returns a pointer to the stash for a specified package, possibly
1436cached. Implements both C<gv_stashpvn> and C<gc_stashsv>.
1437
1438Requires one of either namesv or namepv to be non-null.
1439
fbe13c60 1440See C<L</gv_stashpvn>> for details on "flags".
808724c8 1441
1442Note the sv interface is strongly preferred for performance reasons.
1443
1444*/
1445
1446#define PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED \
1447 assert(namesv || name)
1448
1449PERL_STATIC_INLINE HV*
1450S_gv_stashsvpvn_cached(pTHX_ SV *namesv, const char *name, U32 namelen, I32 flags)
4e7ebec5 1451{
1452 HV* stash;
808724c8 1453 HE* he;
1454
1455 PERL_ARGS_ASSERT_GV_STASHSVPVN_CACHED;
1456
1457 he = (HE *)hv_common(
1458 PL_stashcache, namesv, name, namelen,
4e7ebec5 1459 (flags & SVf_UTF8) ? HVhek_UTF8 : 0, 0, NULL, 0
1460 );
808724c8 1461
4e7ebec5 1462 if (he) return INT2PTR(HV*,SvIVX(HeVAL(he)));
d283e876 1463 else if (flags & GV_CACHE_ONLY) return NULL;
4e7ebec5 1464
808724c8 1465 if (namesv) {
1466 if (SvOK(namesv)) { /* prevent double uninit warning */
1467 STRLEN len;
1468 name = SvPV_const(namesv, len);
1469 namelen = len;
1470 flags |= SvUTF8(namesv);
1471 } else {
1472 name = ""; namelen = 0;
1473 }
1474 }
0eadbdad
YO		 1475 stash = gv_stashpvn_internal(name, namelen, flags);
1476
4e7ebec5 1477 if (stash && namelen) {
1478 SV* const ref = newSViv(PTR2IV(stash));
0eadbdad 1479 (void)hv_store(PL_stashcache, name,
4e7ebec5 1480 (flags & SVf_UTF8) ? -(I32)namelen : (I32)namelen, ref, 0);
1481 }
808724c8 1482
4e7ebec5 1483 return stash;
1484}
1485
808724c8 1486HV*
1487Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags)
1488{
1489 PERL_ARGS_ASSERT_GV_STASHPVN;
1490 return gv_stashsvpvn_cached(NULL, name, namelen, flags);
1491}
1492
954c1994
GS		 1493/*
1494=for apidoc gv_stashsv
1495
fbe13c60
KW		 1496Returns a pointer to the stash for a specified package. See
1497C<L</gv_stashpvn>>.
954c1994 1498
fbe13c60
KW		 1499Note this interface is strongly preferred over C<gv_stashpvn> for performance
1500reasons.
808724c8 1501
954c1994
GS		 1502=cut
1503*/
1504
a0d0e21e 1505HV*
da51bb9b 1506Perl_gv_stashsv(pTHX_ SV *sv, I32 flags)
a0d0e21e 1507{
7918f24d 1508 PERL_ARGS_ASSERT_GV_STASHSV;
808724c8 1509 return gv_stashsvpvn_cached(sv, NULL, 0, flags);
a0d0e21e
LW		 1510}
1511
1512
463ee0b2 1513GV *
fe9845cc 1514Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, const svtype sv_type) {
7918f24d 1515 PERL_ARGS_ASSERT_GV_FETCHPV;
b7787f18 1516 return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type);
7a5fd60d
NC		 1517}
1518
1519GV *
fe9845cc 1520Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, const svtype sv_type) {
7a5fd60d 1521 STRLEN len;
77cb3b01
FC		 1522 const char * const nambeg =
1523 SvPV_flags_const(name, len, flags & GV_NO_SVGMAGIC ? 0 : SV_GMAGIC);
7918f24d 1524 PERL_ARGS_ASSERT_GV_FETCHSV;
7a5fd60d
NC		 1525 return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type);
1526}
1527
90aeefb4 1528PERL_STATIC_INLINE void
290a1700 1529S_gv_magicalize_isa(pTHX_ GV *gv)
ad7cce9f
FR		 1530{
1531 AV* av;
1532
1533 PERL_ARGS_ASSERT_GV_MAGICALIZE_ISA;
1534
1535 av = GvAVn(gv);
1536 GvMULTI_on(gv);
1537 sv_magic(MUTABLE_SV(av), MUTABLE_SV(gv), PERL_MAGIC_isa,
1538 NULL, 0);
ad7cce9f
FR		 1539}
1540
90aeefb4
BF		 1541/* This function grabs name and tries to split a stash and glob
1542 * from its contents. TODO better description, comments
1543 *
1544 * If the function returns TRUE and 'name == name_end', then
1545 * 'gv' can be directly returned to the caller of gv_fetchpvn_flags
1546 */
1547PERL_STATIC_INLINE bool
1548S_parse_gv_stash_name(pTHX_ HV **stash, GV **gv, const char **name,
1549 STRLEN *len, const char *nambeg, STRLEN full_len,
1550 const U32 is_utf8, const I32 add)
1551{
1552 const char *name_cursor;
1553 const char *const name_end = nambeg + full_len;
1554 const char *const name_em1 = name_end - 1;
1555
1556 PERL_ARGS_ASSERT_PARSE_GV_STASH_NAME;
1557
1558 if (full_len > 2 && **name == '*' && isIDFIRST_lazy_if(*name + 1, is_utf8)) {
1559 /* accidental stringify on a GV? */
1560 (*name)++;
1561 }
1562
1563 for (name_cursor = *name; name_cursor < name_end; name_cursor++) {
1564 if (name_cursor < name_em1 &&
1565 ((*name_cursor == ':' && name_cursor[1] == ':')
1566 || *name_cursor == '\''))
1567 {
1568 if (!*stash)
1569 *stash = PL_defstash;
1570 if (!*stash || !SvREFCNT(*stash)) /* symbol table under destruction */
1571 return FALSE;
1572
1573 *len = name_cursor - *name;
1574 if (name_cursor > nambeg) { /* Skip for initial :: or ' */
1575 const char *key;
1576 GV**gvp;
1577 if (*name_cursor == ':') {
1578 key = *name;
1579 *len += 2;
1580 }
1581 else {
1582 char *tmpbuf;
1583 Newx(tmpbuf, *len+2, char);
1584 Copy(*name, tmpbuf, *len, char);
1585 tmpbuf[(*len)++] = ':';
1586 tmpbuf[(*len)++] = ':';
1587 key = tmpbuf;
1588 }
c161da64 1589 gvp = (GV**)hv_fetch(*stash, key, is_utf8 ? -((I32)*len) : (I32)*len, add);
90aeefb4
BF		 1590 *gv = gvp ? *gvp : NULL;
1591 if (*gv && *gv != (const GV *)&PL_sv_undef) {
1592 if (SvTYPE(*gv) != SVt_PVGV)
1593 gv_init_pvn(*gv, *stash, key, *len, (add & GV_ADDMULTI)|is_utf8);
1594 else
1595 GvMULTI_on(*gv);
1596 }
1597 if (key != *name)
1598 Safefree(key);
1599 if (!*gv || *gv == (const GV *)&PL_sv_undef)
1600 return FALSE;
1601
1602 if (!(*stash = GvHV(*gv))) {
1603 *stash = GvHV(*gv) = newHV();
1604 if (!HvNAME_get(*stash)) {
1605 if (GvSTASH(*gv) == PL_defstash && *len == 6
1606 && strnEQ(*name, "CORE", 4))
1607 hv_name_set(*stash, "CORE", 4, 0);
1608 else
1609 hv_name_set(
1610 *stash, nambeg, name_cursor-nambeg, is_utf8
1611 );
1612 /* If the containing stash has multiple effective
1613 names, see that this one gets them, too. */
1614 if (HvAUX(GvSTASH(*gv))->xhv_name_count)
1615 mro_package_moved(*stash, NULL, *gv, 1);
1616 }
1617 }
1618 else if (!HvNAME_get(*stash))
1619 hv_name_set(*stash, nambeg, name_cursor - nambeg, is_utf8);
1620 }
1621
1622 if (*name_cursor == ':')
1623 name_cursor++;
1624 *name = name_cursor+1;
1625 if (*name == name_end) {
1626 if (!*gv)
1627 *gv = MUTABLE_GV(*hv_fetchs(PL_defstash, "main::", TRUE));
1628 return TRUE;
1629 }
1630 }
1631 }
1632 *len = name_cursor - *name;
1633 return TRUE;
1634}
1635
536d1a88 1636/* Checks if an unqualified name is in the main stash */
90aeefb4 1637PERL_STATIC_INLINE bool
536d1a88 1638S_gv_is_in_main(pTHX_ const char *name, STRLEN len, const U32 is_utf8)
90aeefb4 1639{
536d1a88 1640 PERL_ARGS_ASSERT_GV_IS_IN_MAIN;
90aeefb4 1641
90aeefb4 1642 /* If it's an alphanumeric variable */
536d1a88 1643 if ( len && isIDFIRST_lazy_if(name, is_utf8) ) {
90aeefb4
BF		 1644 /* Some "normal" variables are always in main::,
1645 * like INC or STDOUT.
1646 */
1647 switch (len) {
1648 case 1:
1649 if (*name == '_')
536d1a88 1650 return TRUE;
90aeefb4
BF		 1651 break;
1652 case 3:
1653 if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C')
1654 || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V')
1655 || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G'))
536d1a88 1656 return TRUE;
90aeefb4
BF		 1657 break;
1658 case 4:
1659 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1660 && name[3] == 'V')
536d1a88 1661 return TRUE;
90aeefb4
BF		 1662 break;
1663 case 5:
1664 if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D'
1665 && name[3] == 'I' && name[4] == 'N')
536d1a88 1666 return TRUE;
90aeefb4
BF		 1667 break;
1668 case 6:
1669 if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D')
1670 &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T')
1671 ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R')))
536d1a88 1672 return TRUE;
90aeefb4
BF		 1673 break;
1674 case 7:
1675 if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G'
1676 && name[3] == 'V' && name[4] == 'O' && name[5] == 'U'
1677 && name[6] == 'T')
536d1a88 1678 return TRUE;
90aeefb4
BF		 1679 break;
1680 }
536d1a88
BF		 1681 }
1682 /* *{""}, or a special variable like $@ */
1683 else
1684 return TRUE;
1685
1686 return FALSE;
1687}
1688
1689
1690/* This function is called if parse_gv_stash_name() failed to
1691 * find a stash, or if GV_NOTQUAL or an empty name was passed
1692 * to gv_fetchpvn_flags.
1693 *
1694 * It returns FALSE if the default stash can't be found nor created,
1695 * which might happen during global destruction.
1696 */
1697PERL_STATIC_INLINE bool
1698S_find_default_stash(pTHX_ HV **stash, const char *name, STRLEN len,
1699 const U32 is_utf8, const I32 add,
1700 const svtype sv_type)
1701{
1702 PERL_ARGS_ASSERT_FIND_DEFAULT_STASH;
1703
1704 /* No stash in name, so see how we can default */
90aeefb4 1705
536d1a88
BF		 1706 if ( gv_is_in_main(name, len, is_utf8) ) {
1707 *stash = PL_defstash;
1708 }
1709 else {
1710 if (IN_PERL_COMPILETIME) {
90aeefb4
BF		 1711 *stash = PL_curstash;
1712 if (add && (PL_hints & HINT_STRICT_VARS) &&
1713 sv_type != SVt_PVCV &&
1714 sv_type != SVt_PVGV &&
1715 sv_type != SVt_PVFM &&
1716 sv_type != SVt_PVIO &&
1717 !(len == 1 && sv_type == SVt_PV &&
1718 (*name == 'a' || *name == 'b')) )
1719 {
c161da64 1720 GV**gvp = (GV**)hv_fetch(*stash,name,is_utf8 ? -(I32)len : (I32)len,0);
90aeefb4
BF		 1721 if (!gvp || *gvp == (const GV *)&PL_sv_undef ||
1722 SvTYPE(*gvp) != SVt_PVGV)
1723 {
1724 *stash = NULL;
1725 }
1726 else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) ||
1727 (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) ||
1728 (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) )
1729 {
1730 /* diag_listed_as: Variable "%s" is not imported%s */
1731 Perl_ck_warner_d(
1732 aTHX_ packWARN(WARN_MISC),
1733 "Variable \"%c%"UTF8f"\" is not imported",
1734 sv_type == SVt_PVAV ? '@' :
1735 sv_type == SVt_PVHV ? '%' : '$',
1736 UTF8fARG(is_utf8, len, name));
1737 if (GvCVu(*gvp))
1738 Perl_ck_warner_d(
1739 aTHX_ packWARN(WARN_MISC),
1740 "\t(Did you mean &%"UTF8f" instead?)\n",
1741 UTF8fARG(is_utf8, len, name)
1742 );
1743 *stash = NULL;
1744 }
1745 }
1746 }
1747 else {
1748 /* Use the current op's stash */
1749 *stash = CopSTASH(PL_curcop);
1750 }
1751 }
90aeefb4
BF		 1752
1753 if (!*stash) {
1754 if (add && !PL_in_clean_all) {
10860bf4
FC		 1755 GV *gv;
1756 qerror(Perl_mess(aTHX_
90aeefb4 1757 "Global symbol \"%s%"UTF8f
d8c6310a
FC		 1758 "\" requires explicit package name (did you forget to "
1759 "declare \"my %s%"UTF8f"\"?)",
1760 (sv_type == SVt_PV ? "$"
1761 : sv_type == SVt_PVAV ? "@"
1762 : sv_type == SVt_PVHV ? "%"
1763 : ""), UTF8fARG(is_utf8, len, name),
90aeefb4
BF		 1764 (sv_type == SVt_PV ? "$"
1765 : sv_type == SVt_PVAV ? "@"
1766 : sv_type == SVt_PVHV ? "%"
10860bf4 1767 : ""), UTF8fARG(is_utf8, len, name)));
cd164bf8
BF		 1768 /* To maintain the output of errors after the strict exception
1769 * above, and to keep compat with older releases, rather than
1770 * placing the variables in the pad, we place
1771 * them in the <none>:: stash.
1772 */
90aeefb4
BF		 1773 gv = gv_fetchpvs("<none>::", GV_ADDMULTI, SVt_PVHV);
1774 if (!gv) {
1775 /* symbol table under destruction */
1776 return FALSE;
1777 }
1778 *stash = GvHV(gv);
1779 }
1780 else
1781 return FALSE;
1782 }
1783
1784 if (!SvREFCNT(*stash)) /* symbol table under destruction */
1785 return FALSE;
1786
1787 return TRUE;
1788}
1789
8c995aba
FC		 1790/* gv_magicalize only turns on the SVf_READONLY flag, not SVf_PROTECT. So
1791 redefine SvREADONLY_on for that purpose. We don’t use it later on in
1792 this file. */
1793#undef SvREADONLY_on
1794#define SvREADONLY_on(sv) (SvFLAGS(sv) |= SVf_READONLY)
1795
930867a8
BF		 1796/* gv_magicalize() is called by gv_fetchpvn_flags when creating
1797 * a new GV.
1798 * Note that it does not insert the GV into the stash prior to
1799 * magicalization, which some variables require need in order
1800 * to work (like $[, %+, %-, %!), so callers must take care of
1801 * that beforehand.
1802 *
1803 * The return value has a specific meaning for gv_fetchpvn_flags:
1804 * If it returns true, and the gv is empty, it indicates that its
1805 * refcount should be decreased.
1806 */
1807PERL_STATIC_INLINE bool
1808S_gv_magicalize(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len,
71c35c05 1809 bool addmg, const svtype sv_type)
79072805 1810{
960b831f 1811 SSize_t paren;
79072805 1812
930867a8 1813 PERL_ARGS_ASSERT_GV_MAGICALIZE;
90aeefb4 1814
44428a46 1815 if (stash != PL_defstash) { /* not the main stash */
ea238638 1816 /* We only have to check for a few names here: a, b, EXPORT, ISA
4aaa4757
FC		 1817 and VERSION. All the others apply only to the main stash or to
1818 CORE (which is checked right after this). */
ea238638 1819 if (len) {
b464bac0 1820 const char * const name2 = name + 1;
cc4c2da6 1821 switch (*name) {
cc4c2da6
NC		 1822 case 'E':
1823 if (strnEQ(name2, "XPORT", 5))
1824 GvMULTI_on(gv);
1825 break;
1826 case 'I':
44428a46 1827 if (strEQ(name2, "SA"))
290a1700 1828 gv_magicalize_isa(gv);
cc4c2da6 1829 break;
44428a46
FC		 1830 case 'V':
1831 if (strEQ(name2, "ERSION"))
1832 GvMULTI_on(gv);
1833 break;
ea238638
FC		 1834 case 'a':
1835 case 'b':
1836 if (len == 1 && sv_type == SVt_PV)
1837 GvMULTI_on(gv);
924ba076 1838 /* FALLTHROUGH */
4aaa4757
FC		 1839 default:
1840 goto try_core;
1841 }
930867a8 1842 return addmg;
4aaa4757
FC		 1843 }
1844 try_core:
1845 if (len > 1 /* shortest is uc */ && HvNAMELEN_get(stash) == 4) {
1846 /* Avoid null warning: */
1847 const char * const stashname = HvNAME(stash); assert(stashname);
87566176
FC		 1848 if (strnEQ(stashname, "CORE", 4))
1849 S_maybe_add_coresub(aTHX_ 0, gv, name, len);
44428a46
FC		 1850 }
1851 }
1852 else if (len > 1) {
1853#ifndef EBCDIC
1854 if (*name > 'V' ) {
1855 NOOP;
1856 /* Nothing else to do.
1857 The compiler will probably turn the switch statement into a
1858 branch table. Make sure we avoid even that small overhead for
2ae25f5c
KW		 1859 the common case of lower case variable names. (On EBCDIC
1860 platforms, we can't just do:
1861 if (NATIVE_TO_ASCII(*name) > NATIVE_TO_ASCII('V') ) {
1862 because cases like '\027' in the switch statement below are
1863 C1 (non-ASCII) controls on those platforms, so the remapping
1864 would make them larger than 'V')
1865 */
44428a46
FC		 1866 } else
1867#endif
1868 {
3e669301 1869 const char * name2 = name + 1;
44428a46
FC		 1870 switch (*name) {
1871 case 'A':
1872 if (strEQ(name2, "RGV")) {
1873 IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START;
1874 }
1875 else if (strEQ(name2, "RGVOUT")) {
1876 GvMULTI_on(gv);
1877 }
1878 break;
1879 case 'E':
1880 if (strnEQ(name2, "XPORT", 5))
1881 GvMULTI_on(gv);
1882 break;
1883 case 'I':
1884 if (strEQ(name2, "SA")) {
290a1700 1885 gv_magicalize_isa(gv);
44428a46
FC		 1886 }
1887 break;
cc4c2da6
NC		 1888 case 'S':
1889 if (strEQ(name2, "IG")) {
1890 HV *hv;
1891 I32 i;
d525a7b2
NC		 1892 if (!PL_psig_name) {
1893 Newxz(PL_psig_name, 2 * SIG_SIZE, SV*);
a02a5408 1894 Newxz(PL_psig_pend, SIG_SIZE, int);
d525a7b2 1895 PL_psig_ptr = PL_psig_name + SIG_SIZE;
0bdedcb3
NC		 1896 } else {
1897 /* I think that the only way to get here is to re-use an
1898 embedded perl interpreter, where the previous
1899 use didn't clean up fully because
1900 PL_perl_destruct_level was 0. I'm not sure that we
1901 "support" that, in that I suspect in that scenario
1902 there are sufficient other garbage values left in the
1903 interpreter structure that something else will crash
1904 before we get here. I suspect that this is one of
1905 those "doctor, it hurts when I do this" bugs. */
d525a7b2 1906 Zero(PL_psig_name, 2 * SIG_SIZE, SV*);
0bdedcb3 1907 Zero(PL_psig_pend, SIG_SIZE, int);
cc4c2da6
NC		 1908 }
1909 GvMULTI_on(gv);
1910 hv = GvHVn(gv);
a0714e2c 1911 hv_magic(hv, NULL, PERL_MAGIC_sig);
cc4c2da6 1912 for (i = 1; i < SIG_SIZE; i++) {
551405c4 1913 SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1);
cc4c2da6
NC		 1914 if (init)
1915 sv_setsv(*init, &PL_sv_undef);
cc4c2da6
NC		 1916 }
1917 }
1918 break;
1919 case 'V':
1920 if (strEQ(name2, "ERSION"))
1921 GvMULTI_on(gv);
1922 break;
e5218da5
GA		 1923 case '\003': /* $^CHILD_ERROR_NATIVE */
1924 if (strEQ(name2, "HILD_ERROR_NATIVE"))
1925 goto magicalize;
1926 break;
cc4c2da6 1927 case '\005': /* $^ENCODING */
3e669301
KW		 1928 if (*name2 == '_') {
1929 name2++;
1930 }
cc4c2da6
NC		 1931 if (strEQ(name2, "NCODING"))
1932 goto magicalize;
1933 break;
9ebf26ad
FR		 1934 case '\007': /* $^GLOBAL_PHASE */
1935 if (strEQ(name2, "LOBAL_PHASE"))
1936 goto ro_magicalize;
1937 break;
8561ea1d
FC		 1938 case '\014': /* $^LAST_FH */
1939 if (strEQ(name2, "AST_FH"))
1940 goto ro_magicalize;
1941 break;
cde0cee5 1942 case '\015': /* $^MATCH */
960b831f
NC		 1943 if (strEQ(name2, "ATCH")) {
1944 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1945 goto storeparen;
1946 }
66230c86 1947 break;
cc4c2da6
NC		 1948 case '\017': /* $^OPEN */
1949 if (strEQ(name2, "PEN"))
1950 goto magicalize;
1951 break;
cde0cee5 1952 case '\020': /* $^PREMATCH $^POSTMATCH */
960b831f
NC		 1953 if (strEQ(name2, "REMATCH")) {
1954 paren = RX_BUFF_IDX_CARET_PREMATCH;
1955 goto storeparen;
1956 }
1957 if (strEQ(name2, "OSTMATCH")) {
1958 paren = RX_BUFF_IDX_CARET_POSTMATCH;
1959 goto storeparen;
1960 }
9ebf26ad 1961 break;
cc4c2da6
NC		 1962 case '\024': /* ${^TAINT} */
1963 if (strEQ(name2, "AINT"))
1964 goto ro_magicalize;
1965 break;
7cebcbc0 1966 case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */
a0288114 1967 if (strEQ(name2, "NICODE"))
cc4c2da6 1968 goto ro_magicalize;
a0288114 1969 if (strEQ(name2, "TF8LOCALE"))
7cebcbc0 1970 goto ro_magicalize;
e07ea26a
NC		 1971 if (strEQ(name2, "TF8CACHE"))
1972 goto magicalize;
cc4c2da6
NC		 1973 break;
1974 case '\027': /* $^WARNING_BITS */
1975 if (strEQ(name2, "ARNING_BITS"))
1976 goto magicalize;
8ca2a5d6
DD		 1977#ifdef WIN32
1978 else if (strEQ(name2, "IN32_SLOPPY_STAT"))
1979 goto magicalize;
1980#endif
cc4c2da6
NC		 1981 break;
1982 case '1':
1983 case '2':
1984 case '3':
1985 case '4':
1986 case '5':
1987 case '6':
1988 case '7':
1989 case '8':
1990 case '9':
85e6fe83 1991 {
2fdbfb4d
AB		 1992 /* Ensures that we have an all-digit variable, ${"1foo"} fails
1993 this test */
22ff3130
HS		 1994 UV uv;
1995 if (!grok_atoUV(name, &uv, NULL) || uv > I32_MAX)
1996 return addmg;
1997 /* XXX why are we using a SSize_t? */
1998 paren = (SSize_t)(I32)uv;
960b831f 1999 goto storeparen;
1d7c1841 2000 }
dc437b57 2001 }
93a17b20 2002 }
392db708
NC		 2003 } else {
2004 /* Names of length 1. (Or 0. But name is NUL terminated, so that will
2005 be case '\0' in this switch statement (ie a default case) */
cc4c2da6 2006 switch (*name) {
6361f656 2007 case '&': /* $& */
960b831f
NC		 2008 paren = RX_BUFF_IDX_FULLMATCH;
2009 goto sawampersand;
6361f656 2010 case '`': /* $` */
960b831f
NC		 2011 paren = RX_BUFF_IDX_PREMATCH;
2012 goto sawampersand;
6361f656 2013 case '\'': /* $' */
960b831f
NC		 2014 paren = RX_BUFF_IDX_POSTMATCH;
2015 sawampersand:
1a904fc8 2016#ifdef PERL_SAWAMPERSAND
a289ef89 2017 if (!(
cc4c2da6
NC		 2018 sv_type == SVt_PVAV ||
2019 sv_type == SVt_PVHV ||
2020 sv_type == SVt_PVCV ||
2021 sv_type == SVt_PVFM ||
2022 sv_type == SVt_PVIO
d3b97530
DM		 2023 )) { PL_sawampersand |=
2024 (*name == '`')
2025 ? SAWAMPERSAND_LEFT
2026 : (*name == '&')
2027 ? SAWAMPERSAND_MIDDLE
2028 : SAWAMPERSAND_RIGHT;
2029 }
1a904fc8 2030#endif
960b831f 2031 goto storeparen;
e91d8259
NC		 2032 case '1': /* $1 */
2033 case '2': /* $2 */
2034 case '3': /* $3 */
2035 case '4': /* $4 */
2036 case '5': /* $5 */
2037 case '6': /* $6 */
2038 case '7': /* $7 */
2039 case '8': /* $8 */
2040 case '9': /* $9 */
960b831f
NC		 2041 paren = *name - '0';
2042
2043 storeparen:
e91d8259
NC		 2044 /* Flag the capture variables with a NULL mg_ptr
2045 Use mg_len for the array index to lookup. */
960b831f 2046 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, NULL, paren);
e91d8259 2047 break;
cc4c2da6 2048
6361f656 2049 case ':': /* $: */
c69033f2 2050 sv_setpv(GvSVn(gv),PL_chopset);
cc4c2da6
NC		 2051 goto magicalize;
2052
6361f656 2053 case '?': /* $? */
ff0cee69 2054#ifdef COMPLEX_STATUS
c69033f2 2055 SvUPGRADE(GvSVn(gv), SVt_PVLV);
ff0cee69 2056#endif
cc4c2da6 2057 goto magicalize;
ff0cee69 2058
6361f656 2059 case '!': /* $! */
67261566 2060 GvMULTI_on(gv);
44a2ac75 2061 /* If %! has been used, automatically load Errno.pm. */
d2c93421 2062
ad64d0ec 2063 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
d2c93421 2064
44a2ac75 2065 /* magicalization must be done before require_tie_mod is called */
67261566 2066 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
ffdb8bcd 2067 {
44a2ac75 2068 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
930867a8 2069 addmg = FALSE;
ffdb8bcd 2070 }
d2c93421 2071
6cef1e77 2072 break;
6361f656
AB		 2073 case '-': /* $- */
2074 case '+': /* $+ */
44a2ac75
YO		 2075 GvMULTI_on(gv); /* no used once warnings here */
2076 {
44a2ac75 2077 AV* const av = GvAVn(gv);
ad64d0ec 2078 SV* const avc = (*name == '+') ? MUTABLE_SV(av) : NULL;
44a2ac75 2079
ad64d0ec
NC		 2080 sv_magic(MUTABLE_SV(av), avc, PERL_MAGIC_regdata, NULL, 0);
2081 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
67261566 2082 if (avc)
44a2ac75 2083 SvREADONLY_on(GvSVn(gv));
44a2ac75 2084 SvREADONLY_on(av);
67261566
YO		 2085
2086 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV)
213084e4 2087 {
192b9cd1 2088 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
930867a8 2089 addmg = FALSE;
213084e4 2090 }
67261566 2091
80305961 2092 break;
cc4c2da6 2093 }
6361f656
AB		 2094 case '*': /* $* */
2095 case '#': /* $# */
9b387841 2096 if (sv_type == SVt_PV)
4f650b80 2097 /* diag_listed_as: $* is no longer supported */
9b387841 2098 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX),
4f650b80 2099 "$%c is no longer supported", *name);
8ae1fe26 2100 break;
b3ca2e83
NC		 2101 case '\010': /* $^H */
2102 {
2103 HV *const hv = GvHVn(gv);
2104 hv_magic(hv, NULL, PERL_MAGIC_hints);
2105 }
2106 goto magicalize;
b82b06b8 2107 case '[': /* $[ */
7d69d4a6 2108 if ((sv_type == SVt_PV || sv_type == SVt_PVGV)
2846acbf 2109 && FEATURE_ARYBASE_IS_ENABLED) {
b82b06b8 2110 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
930867a8 2111 addmg = FALSE;
b82b06b8 2112 }
7d69d4a6 2113 else goto magicalize;
b82b06b8 2114 break;
cc4c2da6 2115 case '\023': /* $^S */
2fdbfb4d
AB		 2116 ro_magicalize:
2117 SvREADONLY_on(GvSVn(gv));
924ba076 2118 /* FALLTHROUGH */
6361f656 2119 case '0': /* $0 */
6361f656
AB		 2120 case '^': /* $^ */
2121 case '~': /* $~ */
2122 case '=': /* $= */
2123 case '%': /* $% */
2124 case '.': /* $. */
2125 case '(': /* $( */
2126 case ')': /* $) */
2127 case '<': /* $< */
2128 case '>': /* $> */
2129 case '\\': /* $\ */
2130 case '/': /* $/ */
4505a31f 2131 case '|': /* $| */
9cdac2a2 2132 case '$': /* $$ */
cc4c2da6
NC		 2133 case '\001': /* $^A */
2134 case '\003': /* $^C */
2135 case '\004': /* $^D */
2136 case '\005': /* $^E */
2137 case '\006': /* $^F */
cc4c2da6
NC		 2138 case '\011': /* $^I, NOT \t in EBCDIC */
2139 case '\016': /* $^N */
2140 case '\017': /* $^O */
2141 case '\020': /* $^P */
2142 case '\024': /* $^T */
2143 case '\027': /* $^W */
2144 magicalize:
ad64d0ec 2145 sv_magic(GvSVn(gv), MUTABLE_SV(gv), PERL_MAGIC_sv, name, len);
cc4c2da6 2146 break;
e521374c 2147
cc4c2da6 2148 case '\014': /* $^L */
76f68e9b 2149 sv_setpvs(GvSVn(gv),"\f");
463ee0b2 2150 break;
6361f656 2151 case ';': /* $; */
76f68e9b 2152 sv_setpvs(GvSVn(gv),"\034");
463ee0b2 2153 break;
6361f656 2154 case ']': /* $] */
cc4c2da6 2155 {
3638bf15 2156 SV * const sv = GvSV(gv);
d7aa5382 2157 if (!sv_derived_from(PL_patchlevel, "version"))
ac0e6a2f 2158 upg_version(PL_patchlevel, TRUE);
7d54d38e
SH		 2159 GvSV(gv) = vnumify(PL_patchlevel);
2160 SvREADONLY_on(GvSV(gv));
2161 SvREFCNT_dec(sv);
93a17b20
LW		 2162 }
2163 break;
cc4c2da6
NC		 2164 case '\026': /* $^V */
2165 {
3638bf15 2166 SV * const sv = GvSV(gv);
f9be5ac8
DM		 2167 GvSV(gv) = new_version(PL_patchlevel);
2168 SvREADONLY_on(GvSV(gv));
2169 SvREFCNT_dec(sv);
16070b82
GS		 2170 }
2171 break;
ea238638
FC		 2172 case 'a':
2173 case 'b':
dc3e91f6 2174 if (sv_type == SVt_PV)
ea238638 2175 GvMULTI_on(gv);
cc4c2da6 2176 }
79072805 2177 }
930867a8
BF		 2178
2179 return addmg;
71c35c05
BF		 2180}
2181
8c995aba
FC		 2182/* If we do ever start using this later on in the file, we need to make
2183 sure we don’t accidentally use the wrong definition. */
2184#undef SvREADONLY_on
2185
070dc475
BF		 2186/* This function is called when the stash already holds the GV of the magic
2187 * variable we're looking for, but we need to check that it has the correct
2188 * kind of magic. For example, if someone first uses $! and then %!, the
2189 * latter would end up here, and we add the Errno tie to the HASH slot of
2190 * the *! glob.
2191 */
2192PERL_STATIC_INLINE void
2193S_maybe_multimagic_gv(pTHX_ GV *gv, const char *name, const svtype sv_type)
2194{
2195 PERL_ARGS_ASSERT_MAYBE_MULTIMAGIC_GV;
2196
2197 if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) {
2198 if (*name == '!')
2199 require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1);
2200 else if (*name == '-' || *name == '+')
2201 require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "TIEHASH", 0);
2202 } else if (sv_type == SVt_PV) {
2203 if (*name == '*' || *name == '#') {
2204 /* diag_listed_as: $* is no longer supported */
2205 Perl_ck_warner_d(aTHX_ packWARN2(WARN_DEPRECATED,
2206 WARN_SYNTAX),
2207 "$%c is no longer supported", *name);
2208 }
2209 }
2210 if (sv_type==SVt_PV || sv_type==SVt_PVGV) {
2211 switch (*name) {
2212 case '[':
2213 require_tie_mod(gv,name,newSVpvs("arybase"),"FETCH",0);
2214 break;
2215#ifdef PERL_SAWAMPERSAND
2216 case '`':
2217 PL_sawampersand |= SAWAMPERSAND_LEFT;
2218 (void)GvSVn(gv);
2219 break;
2220 case '&':
2221 PL_sawampersand |= SAWAMPERSAND_MIDDLE;
2222 (void)GvSVn(gv);
2223 break;
2224 case '\'':
2225 PL_sawampersand |= SAWAMPERSAND_RIGHT;
2226 (void)GvSVn(gv);
2227 break;
2228#endif
2229 }
2230 }
2231}
2232
71c35c05
BF		 2233GV *
2234Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags,
2235 const svtype sv_type)
2236{
71c35c05
BF		 2237 const char *name = nambeg;
2238 GV *gv = NULL;
2239 GV**gvp;
2240 STRLEN len;
2241 HV *stash = NULL;
2242 const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT);
2243 const I32 no_expand = flags & GV_NOEXPAND;
2244 const I32 add = flags & ~GV_NOADD_MASK;
2245 const U32 is_utf8 = flags & SVf_UTF8;
930867a8 2246 bool addmg = cBOOL(flags & GV_ADDMG);
71c35c05
BF		 2247 const char *const name_end = nambeg + full_len;
2248 U32 faking_it;
2249
2250 PERL_ARGS_ASSERT_GV_FETCHPVN_FLAGS;
2251
2252 /* If we have GV_NOTQUAL, the caller promised that
2253 * there is no stash, so we can skip the check.
2254 * Similarly if full_len is 0, since then we're
2255 * dealing with something like *{""} or ""->foo()
2256 */
2257 if ((flags & GV_NOTQUAL) || !full_len) {
2258 len = full_len;
2259 }
2260 else if (parse_gv_stash_name(&stash, &gv, &name, &len, nambeg, full_len, is_utf8, add)) {
2261 if (name == name_end) return gv;
2262 }
2263 else {
2264 return NULL;
2265 }
2266
2267 if (!stash && !find_default_stash(&stash, name, len, is_utf8, add, sv_type)) {
2268 return NULL;
2269 }
2270
2271 /* By this point we should have a stash and a name */
c161da64 2272 gvp = (GV**)hv_fetch(stash,name,is_utf8 ? -(I32)len : (I32)len,add);
71c35c05
BF		 2273 if (!gvp || *gvp == (const GV *)&PL_sv_undef) {
2274 if (addmg) gv = (GV *)newSV(0);
2275 else return NULL;
2276 }
2277 else gv = *gvp, addmg = 0;
2278 /* From this point on, addmg means gv has not been inserted in the
2279 symtab yet. */
2280
2281 if (SvTYPE(gv) == SVt_PVGV) {
c002ae9a
BF		 2282 /* The GV already exists, so return it, but check if we need to do
2283 * anything else with it before that.
2284 */
71c35c05 2285 if (add) {
c002ae9a
BF		 2286 /* This is the heuristic that handles if a variable triggers the
2287 * 'used only once' warning. If there's already a GV in the stash
2288 * with this name, then we assume that the variable has been used
2289 * before and turn its MULTI flag on.
2290 * It's a heuristic because it can easily be "tricked", like with
2291 * BEGIN { $a = 1; $::{foo} = *a }; () = $foo
2292 * not warning about $main::foo being used just once
2293 */
71c35c05
BF		 2294 GvMULTI_on(gv);
2295 gv_init_svtype(gv, sv_type);
2296 /* You reach this path once the typeglob has already been created,
2297 either by the same or a different sigil. If this path didn't
2298 exist, then (say) referencing $! first, and %! second would
2299 mean that %! was not handled correctly. */
2300 if (len == 1 && stash == PL_defstash) {
070dc475 2301 maybe_multimagic_gv(gv, name, sv_type);
71c35c05
BF		 2302 }
2303 else if (len == 3 && sv_type == SVt_PVAV
2304 && strnEQ(name, "ISA", 3)
2305 && (!GvAV(gv) || !SvSMAGICAL(GvAV(gv))))
2306 gv_magicalize_isa(gv);
2307 }
2308 return gv;
2309 } else if (no_init) {
2310 assert(!addmg);
2311 return gv;
c002ae9a
BF		 2312 }
2313 /* If GV_NOEXPAND is true and what we got off the stash is a ref,
2314 * don't expand it to a glob. This is an optimization so that things
2315 * copying constants over, like Exporter, don't have to be rewritten
2316 * to take into account that you can store more than just globs in
2317 * stashes.
2318 */
2319 else if (no_expand && SvROK(gv)) {
71c35c05
BF		 2320 assert(!addmg);
2321 return gv;
2322 }
2323
2324 /* Adding a new symbol.
2325 Unless of course there was already something non-GV here, in which case
2326 we want to behave as if there was always a GV here, containing some sort
2327 of subroutine.
2328 Otherwise we run the risk of creating things like GvIO, which can cause
2329 subtle bugs. eg the one that tripped up SQL::Translator */
2330
2331 faking_it = SvOK(gv);
2332
2333 if (add & GV_ADDWARN)
2334 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2335 "Had to create %"UTF8f" unexpectedly",
2336 UTF8fARG(is_utf8, name_end-nambeg, nambeg));
2337 gv_init_pvn(gv, stash, name, len, (add & GV_ADDMULTI)|is_utf8);
2338
9e5de6ae 2339 if ( isIDFIRST_lazy_if(name, is_utf8) && !ckWARN(WARN_ONCE) )
71c35c05
BF		 2340 GvMULTI_on(gv) ;
2341
930867a8
BF		 2342 /* First, store the gv in the symtab if we're adding magic,
2343 * but only for non-empty GVs
2344 */
2345#define GvEMPTY(gv) !(GvAV(gv) || GvHV(gv) || GvIO(gv) \
2346 || GvCV(gv) || (GvSV(gv) && SvOK(GvSV(gv))))
2347
2348 if ( addmg && !GvEMPTY(gv) ) {
2349 (void)hv_store(stash,name,len,(SV *)gv,0);
2350 }
2351
71c35c05 2352 /* set up magic where warranted */
930867a8
BF		 2353 if ( gv_magicalize(gv, stash, name, len, addmg, sv_type) ) {
2354 /* See 23496c6 */
2355 if (GvEMPTY(gv)) {
2356 if ( GvSV(gv) && SvMAGICAL(GvSV(gv)) ) {
2357 /* The GV was and still is "empty", except that now
2358 * it has the magic flags turned on, so we want it
2359 * stored in the symtab.
2360 */
2361 (void)hv_store(stash,name,len,(SV *)gv,0);
2362 }
2363 else {
2364 /* Most likely the temporary GV created above */
2365 SvREFCNT_dec_NN(gv);
2366 gv = NULL;
2367 }
2368 }
2369 }
71c35c05 2370
e6066781 2371 if (gv) gv_init_svtype(gv, faking_it ? SVt_PVCV : sv_type);
93a17b20 2372 return gv;
79072805
LW		 2373}
2374
2375void
35a4481c 2376Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2377{
ed60a868 2378 const char *name;
35a4481c 2379 const HV * const hv = GvSTASH(gv);
7918f24d
NC		 2380
2381 PERL_ARGS_ASSERT_GV_FULLNAME4;
2382
666ea192 2383 sv_setpv(sv, prefix ? prefix : "");
a0288114 2384
52a6327b 2385 if (hv && (name = HvNAME(hv))) {
ed60a868
FC		 2386 const STRLEN len = HvNAMELEN(hv);
2387 if (keepmain || strnNE(name, "main", len)) {
2388 sv_catpvn_flags(sv,name,len,HvNAMEUTF8(hv)?SV_CATUTF8:SV_CATBYTES);
396482e1 2389 sv_catpvs(sv,"::");
ed60a868 2390 }
43693395 2391 }
ed60a868 2392 else sv_catpvs(sv,"__ANON__::");
04f3bf56 2393 sv_catsv(sv,sv_2mortal(newSVhek(GvNAME_HEK(gv))));
43693395
GS		 2394}
2395
2396void
35a4481c 2397Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain)
43693395 2398{
099be4f1 2399 const GV * const egv = GvEGVx(gv);
7918f24d
NC		 2400
2401 PERL_ARGS_ASSERT_GV_EFULLNAME4;
2402
46c461b5 2403 gv_fullname4(sv, egv ? egv : gv, prefix, keepmain);
43693395
GS		 2404}
2405
39a65960
DM		 2406
2407/* recursively scan a stash and any nested stashes looking for entries
2408 * that need the "only used once" warning raised
2409 */
2410
79072805 2411void
51da40ed 2412Perl_gv_check(pTHX_ HV *stash)
79072805 2413{
eb578fdb 2414 I32 i;
463ee0b2 2415
7918f24d
NC		 2416 PERL_ARGS_ASSERT_GV_CHECK;
2417
8990e307
LW		 2418 if (!HvARRAY(stash))
2419 return;
90754377
DM		 2420
2421 assert(SvOOK(stash));
90754377 2422
a0d0e21e 2423 for (i = 0; i <= (I32) HvMAX(stash); i++) {
e1ec3a88 2424 const HE *entry;
90754377 2425 /* mark stash is being scanned, to avoid recursing */
339441ef 2426 HvAUX(stash)->xhv_aux_flags |= HvAUXf_SCAN_STASH;
dc437b57 2427 for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) {
eb578fdb 2428 GV *gv;
b7787f18 2429 HV *hv;
dc437b57 2430 if (HeKEY(entry)[HeKLEN(entry)-1] == ':' &&
159b6efe 2431 (gv = MUTABLE_GV(HeVAL(entry))) && isGV(gv) && (hv = GvHV(gv)))
a0d0e21e 2432 {
90754377
DM		 2433 if (hv != PL_defstash && hv != stash
2434 && !(SvOOK(hv)
2435 && (HvAUX(hv)->xhv_aux_flags & HvAUXf_SCAN_STASH))
2436 )
a0d0e21e
LW		 2437 gv_check(hv); /* nested package */
2438 }
ecad31f0
BF		 2439 else if ( *HeKEY(entry) != '_'
2440 && isIDFIRST_lazy_if(HeKEY(entry), HeUTF8(entry)) ) {
e1ec3a88 2441 const char *file;
159b6efe 2442 gv = MUTABLE_GV(HeVAL(entry));
55d729e4 2443 if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv))
463ee0b2 2444 continue;
1d7c1841 2445 file = GvFILE(gv);
1d7c1841 2446 CopLINE_set(PL_curcop, GvLINE(gv));
1dc74fdb
FC		 2447#ifdef USE_ITHREADS
2448 CopFILE(PL_curcop) = (char *)file; /* set for warning */
2449#else
2450 CopFILEGV(PL_curcop)
2451 = gv_fetchfile_flags(file, HEK_LEN(GvFILE_HEK(gv)), 0);
2452#endif
9014280d 2453 Perl_warner(aTHX_ packWARN(WARN_ONCE),
d0c0e7dd
FC		 2454 "Name \"%"HEKf"::%"HEKf
2455 "\" used only once: possible typo",
2456 HEKfARG(HvNAME_HEK(stash)),
2457 HEKfARG(GvNAME_HEK(gv)));
463ee0b2 2458 }
79072805 2459 }
339441ef 2460 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_SCAN_STASH;
79072805
LW		 2461 }
2462}
2463
2464GV *
9cc50d5b 2465Perl_newGVgen_flags(pTHX_ const char *pack, U32 flags)
79072805 2466{
9cc50d5b 2467 PERL_ARGS_ASSERT_NEWGVGEN_FLAGS;
b17a0679 2468 assert(!(flags & ~SVf_UTF8));
7918f24d 2469
b17a0679
FC		 2470 return gv_fetchpv(Perl_form(aTHX_ "%"UTF8f"::_GEN_%ld",
2471 UTF8fARG(flags, strlen(pack), pack),
9cc50d5b
BF		 2472 (long)PL_gensym++),
2473 GV_ADD, SVt_PVGV);
79072805
LW		 2474}
2475
2476/* hopefully this is only called on local symbol table entries */
2477
2478GP*
864dbfa3 2479Perl_gp_ref(pTHX_ GP *gp)
79072805 2480{
1d7c1841 2481 if (!gp)
d4c19fe8 2482 return NULL;
79072805 2483 gp->gp_refcnt++;
44a8e56a 2484 if (gp->gp_cv) {
2485 if (gp->gp_cvgen) {
e1a479c5
BB		 2486 /* If the GP they asked for a reference to contains
2487 a method cache entry, clear it first, so that we
2488 don't infect them with our cached entry */
e7881358 2489 SvREFCNT_dec_NN(gp->gp_cv);
601f1833 2490 gp->gp_cv = NULL;
44a8e56a 2491 gp->gp_cvgen = 0;
2492 }
44a8e56a 2493 }
79072805 2494 return gp;
79072805
LW		 2495}
2496
2497void
864dbfa3 2498Perl_gp_free(pTHX_ GV *gv)
79072805 2499{
79072805 2500 GP* gp;
b0d55c99 2501 int attempts = 100;
79072805 2502
f7877b28 2503 if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv)))
79072805 2504 return;
f248d071 2505 if (gp->gp_refcnt == 0) {
9b387841
NC		 2506 Perl_ck_warner_d(aTHX_ packWARN(WARN_INTERNAL),
2507 "Attempt to free unreferenced glob pointers"
2508 pTHX__FORMAT pTHX__VALUE);
79072805
LW		 2509 return;
2510 }
4571f4a7 2511 if (gp->gp_refcnt > 1) {
bc81b34d 2512 borrowed:
748a9306
LW		 2513 if (gp->gp_egv == gv)
2514 gp->gp_egv = 0;
4571f4a7 2515 gp->gp_refcnt--;
c43ae56f 2516 GvGP_set(gv, NULL);
79072805 2517 return;
748a9306 2518 }
79072805 2519
b0d55c99
FC		 2520 while (1) {
2521 /* Copy and null out all the glob slots, so destructors do not see
2522 freed SVs. */
2523 HEK * const file_hek = gp->gp_file_hek;
2524 SV * const sv = gp->gp_sv;
2525 AV * const av = gp->gp_av;
2526 HV * const hv = gp->gp_hv;
2527 IO * const io = gp->gp_io;
2528 CV * const cv = gp->gp_cv;
2529 CV * const form = gp->gp_form;
2530
2531 gp->gp_file_hek = NULL;
2532 gp->gp_sv = NULL;
2533 gp->gp_av = NULL;
2534 gp->gp_hv = NULL;
2535 gp->gp_io = NULL;
2536 gp->gp_cv = NULL;
2537 gp->gp_form = NULL;
2538
2539 if (file_hek)
2540 unshare_hek(file_hek);
2541
2542 SvREFCNT_dec(sv);
2543 SvREFCNT_dec(av);
2544 /* FIXME - another reference loop GV -> symtab -> GV ?
2545 Somehow gp->gp_hv can end up pointing at freed garbage. */
2546 if (hv && SvTYPE(hv) == SVt_PVHV) {
c2242065 2547 const HEK *hvname_hek = HvNAME_HEK(hv);
923ed580
FC		 2548 if (PL_stashcache && hvname_hek) {
2549 DEBUG_o(Perl_deb(aTHX_
2550 "gp_free clearing PL_stashcache for '%"HEKf"'\n",
2551 HEKfARG(hvname_hek)));
0ca9877d 2552 (void)hv_deletehek(PL_stashcache, hvname_hek, G_DISCARD);
923ed580 2553 }
b0d55c99
FC		 2554 SvREFCNT_dec(hv);
2555 }
96d7c888
FC		 2556 if (io && SvREFCNT(io) == 1 && IoIFP(io)
2557 && (IoTYPE(io) == IoTYPE_WRONLY ||
2558 IoTYPE(io) == IoTYPE_RDWR ||
2559 IoTYPE(io) == IoTYPE_APPEND)
2560 && ckWARN_d(WARN_IO)
2561 && IoIFP(io) != PerlIO_stdin()
2562 && IoIFP(io) != PerlIO_stdout()
2563 && IoIFP(io) != PerlIO_stderr()
2564 && !(IoFLAGS(io) & IOf_FAKE_DIRP))
2565 io_close(io, gv, FALSE, TRUE);
b0d55c99
FC		 2566 SvREFCNT_dec(io);
2567 SvREFCNT_dec(cv);
2568 SvREFCNT_dec(form);
2569
bc81b34d
FC		 2570 /* Possibly reallocated by a destructor */
2571 gp = GvGP(gv);
2572
b0d55c99
FC		 2573 if (!gp->gp_file_hek
2574 && !gp->gp_sv
2575 && !gp->gp_av
2576 && !gp->gp_hv
2577 && !gp->gp_io
2578 && !gp->gp_cv
2579 && !gp->gp_form) break;
2580
2581 if (--attempts == 0) {
2582 Perl_die(aTHX_
2583 "panic: gp_free failed to free glob pointer - "
2584 "something is repeatedly re-creating entries"
2585 );
2586 }
13207a71 2587 }
748a9306 2588
bc81b34d
FC		 2589 /* Possibly incremented by a destructor doing glob assignment */
2590 if (gp->gp_refcnt > 1) goto borrowed;
79072805 2591 Safefree(gp);
c43ae56f 2592 GvGP_set(gv, NULL);
79072805
LW		 2593}
2594
d460ef45
NIS		 2595int
2596Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg)
2597{
53c1dcc0
AL		 2598 AMT * const amtp = (AMT*)mg->mg_ptr;
2599 PERL_UNUSED_ARG(sv);
dd374669 2600
7918f24d
NC		 2601 PERL_ARGS_ASSERT_MAGIC_FREEOVRLD;
2602
d460ef45
NIS		 2603 if (amtp && AMT_AMAGIC(amtp)) {
2604 int i;
2605 for (i = 1; i < NofAMmeth; i++) {
53c1dcc0 2606 CV * const cv = amtp->table[i];
b37c2d43 2607 if (cv) {
e7881358 2608 SvREFCNT_dec_NN(MUTABLE_SV(cv));
601f1833 2609 amtp->table[i] = NULL;
d460ef45
NIS		 2610 }
2611 }
2612 }
2613 return 0;
2614}
2615
a0d0e21e 2616/* Updates and caches the CV's */
c3a9a790
RGS		 2617/* Returns:
2618 * 1 on success and there is some overload
2619 * 0 if there is no overload
2620 * -1 if some error occurred and it couldn't croak
2621 */
a0d0e21e 2622
c3a9a790 2623int
242f8760 2624Perl_Gv_AMupdate(pTHX_ HV *stash, bool destructing)
a0d0e21e 2625{
ad64d0ec 2626 MAGIC* const mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
a6006777 2627 AMT amt;
9b439311 2628 const struct mro_meta* stash_meta = HvMROMETA(stash);
e1a479c5 2629 U32 newgen;
a0d0e21e 2630
7918f24d
NC		 2631 PERL_ARGS_ASSERT_GV_AMUPDATE;
2632
9b439311 2633 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
14899595
NC		 2634 if (mg) {
2635 const AMT * const amtp = (AMT*)mg->mg_ptr;
66978156 2636 if (amtp->was_ok_sub == newgen) {
8c34e50d 2637 return AMT_AMAGIC(amtp) ? 1 : 0;
14899595 2638 }
ad64d0ec 2639 sv_unmagic(MUTABLE_SV(stash), PERL_MAGIC_overload_table);
14899595 2640 }
a0d0e21e 2641
bfcb3514 2642 DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) );
a0d0e21e 2643
d460ef45 2644 Zero(&amt,1,AMT);
e1a479c5 2645 amt.was_ok_sub = newgen;
a6006777 2646 amt.fallback = AMGfallNO;
2647 amt.flags = 0;
2648
a6006777 2649 {
8c34e50d
FC		 2650 int filled = 0;
2651 int i;
3d147ac2
DM		 2652 bool deref_seen = 0;
2653
a6006777 2654
3866ea3b 2655 /* Work with "fallback" key, which we assume to be first in PL_AMG_names */
a6006777 2656
89ffc314 2657 /* Try to find via inheritance. */
e6919483 2658 GV *gv = gv_fetchmeth_pvn(stash, PL_AMG_names[0], 2, -1, 0);
3866ea3b 2659 SV * const sv = gv ? GvSV(gv) : NULL;
53c1dcc0 2660 CV* cv;
89ffc314
IZ		 2661
2662 if (!gv)
3866ea3b
FC		 2663 {
2664 if (!gv_fetchmeth_pvn(stash, "((", 2, -1, 0))
8c34e50d 2665 goto no_table;
3866ea3b
FC		 2666 }
2667#ifdef PERL_DONT_CREATE_GVSV
2668 else if (!sv) {
6f207bd3 2669 NOOP; /* Equivalent to !SvTRUE and !SvOK */
3866ea3b
FC		 2670 }
2671#endif
79c9643d
JL		 2672 else if (SvTRUE(sv))
2673 /* don't need to set overloading here because fallback => 1
2674 * is the default setting for classes without overloading */
89ffc314 2675 amt.fallback=AMGfallYES;
79c9643d
JL		 2676 else if (SvOK(sv)) {
2677 amt.fallback=AMGfallNEVER;
386a5489 2678 filled = 1;
386a5489 2679 }
79c9643d 2680 else {
386a5489 2681 filled = 1;
386a5489 2682 }
a6006777 2683
3d147ac2 2684 assert(SvOOK(stash));
3d147ac2 2685 /* initially assume the worst */
339441ef 2686 HvAUX(stash)->xhv_aux_flags &= ~HvAUXf_NO_DEREF;
3d147ac2 2687
8c34e50d 2688 for (i = 1; i < NofAMmeth; i++) {
6136c704 2689 const char * const cooky = PL_AMG_names[i];
32251b26 2690 /* Human-readable form, for debugging: */
8c34e50d 2691 const char * const cp = AMG_id2name(i);
d279ab82 2692 const STRLEN l = PL_AMG_namelens[i];
89ffc314 2693
a0288114 2694 DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n",
bfcb3514 2695 cp, HvNAME_get(stash)) );
611c1e95
IZ		 2696 /* don't fill the cache while looking up!
2697 Creation of inheritance stubs in intermediate packages may
2698 conflict with the logic of runtime method substitution.
2699 Indeed, for inheritance A -> B -> C, if C overloads "+0",
2700 then we could have created stubs for "(+0" in A and C too.
2701 But if B overloads "bool", we may want to use it for
2702 numifying instead of C's "+0". */
8c34e50d 2703 gv = Perl_gv_fetchmeth_pvn(aTHX_ stash, cooky, l, -1, 0);
46fc3d4c 2704 cv = 0;
c3ad4e54
FC		 2705 if (gv && (cv = GvCV(gv)) && CvHASGV(cv)) {
2706 const HEK * const gvhek =
2707 CvNAMED(cv) ? CvNAME_HEK(cv) : GvNAME_HEK(CvGV(cv));
2708 const HEK * const stashek =
2709 HvNAME_HEK(CvNAMED(cv) ? CvSTASH(cv) : GvSTASH(CvGV(cv)));
2710 if (HEK_LEN(gvhek) == 3 && strEQ(HEK_KEY(gvhek), "nil")
2711 && stashek && HEK_LEN(stashek) == 8
2712 && strEQ(HEK_KEY(stashek), "overload")) {
611c1e95
IZ		 2713 /* This is a hack to support autoloading..., while
2714 knowing *which* methods were declared as overloaded. */
44a8e56a 2715 /* GvSV contains the name of the method. */
6136c704 2716 GV *ngv = NULL;
c69033f2 2717 SV *gvsv = GvSV(gv);
a0288114
AL		 2718
2719 DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\
2720 "\" for overloaded \"%s\" in package \"%.256s\"\n",
f0e9f182 2721 (void*)GvSV(gv), cp, HvNAME(stash)) );
c69033f2 2722 if (!gvsv || !SvPOK(gvsv)
7f415459 2723 || !(ngv = gv_fetchmethod_sv_flags(stash, gvsv, 0)))
dc848c6f 2724 {
a0288114 2725 /* Can be an import stub (created by "can"). */
242f8760 2726 if (destructing) {
c3a9a790 2727 return -1;
242f8760
RGS		 2728 }
2729 else {
d66cca07
BF		 2730 const SV * const name = (gvsv && SvPOK(gvsv))
2731 ? gvsv
2732 : newSVpvs_flags("???", SVs_TEMP);
dcbac5bb 2733 /* diag_listed_as: Can't resolve method "%s" overloading "%s" in package "%s" */
d66cca07
BF		 2734 Perl_croak(aTHX_ "%s method \"%"SVf256
2735 "\" overloading \"%s\" "\
d0c0e7dd 2736 "in package \"%"HEKf256"\"",
242f8760
RGS		 2737 (GvCVGEN(gv) ? "Stub found while resolving"
2738 : "Can't resolve"),
d66cca07 2739 SVfARG(name), cp,
d0c0e7dd 2740 HEKfARG(
d66cca07 2741 HvNAME_HEK(stash)
d0c0e7dd 2742 ));
242f8760 2743 }
44a8e56a 2744 }
dc848c6f 2745 cv = GvCV(gv = ngv);
44a8e56a 2746 }
b464bac0 2747 DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n",
bfcb3514 2748 cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))),
44a8e56a 2749 GvNAME(CvGV(cv))) );
2750 filled = 1;
611c1e95 2751 } else if (gv) { /* Autoloaded... */
ea726b52 2752 cv = MUTABLE_CV(gv);
611c1e95 2753 filled = 1;
44a8e56a 2754 }
ea726b52 2755 amt.table[i]=MUTABLE_CV(SvREFCNT_inc_simple(cv));
3d147ac2
DM		 2756
2757 if (gv) {
2758 switch (i) {
2759 case to_sv_amg:
2760 case to_av_amg:
2761 case to_hv_amg:
2762 case to_gv_amg:
2763 case to_cv_amg:
2764 case nomethod_amg:
2765 deref_seen = 1;
2766 break;
2767 }
2768 }
a0d0e21e 2769 }
3d147ac2 2770 if (!deref_seen)
45479970
DM		 2771 /* none of @{} etc overloaded; we can do $obj->[N] quicker.
2772 * NB - aux var invalid here, HvARRAY() could have been
2773 * reallocated since it was assigned to */
2774 HvAUX(stash)->xhv_aux_flags |= HvAUXf_NO_DEREF;
3d147ac2 2775
a0d0e21e 2776 if (filled) {
a6006777 2777 AMT_AMAGIC_on(&amt);
ad64d0ec 2778 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2779 (char*)&amt, sizeof(AMT));
8c34e50d 2780 return TRUE;
a0d0e21e
LW		 2781 }
2782 }
a6006777 2783 /* Here we have no table: */
8c34e50d 2784 no_table:
a6006777 2785 AMT_AMAGIC_off(&amt);
ad64d0ec 2786 sv_magic(MUTABLE_SV(stash), 0, PERL_MAGIC_overload_table,
14befaf4 2787 (char*)&amt, sizeof(AMTS));
c3a9a790 2788 return 0;
a0d0e21e
LW		 2789}
2790
32251b26
IZ		 2791
2792CV*
2793Perl_gv_handler(pTHX_ HV *stash, I32 id)
2794{
3f8f4626 2795 MAGIC *mg;
32251b26 2796 AMT *amtp;
e1a479c5 2797 U32 newgen;
9b439311 2798 struct mro_meta* stash_meta;
32251b26 2799
bfcb3514 2800 if (!stash || !HvNAME_get(stash))
601f1833 2801 return NULL;
e1a479c5 2802
9b439311
BB		 2803 stash_meta = HvMROMETA(stash);
2804 newgen = PL_sub_generation + stash_meta->pkg_gen + stash_meta->cache_gen;
e1a479c5 2805
ad64d0ec 2806 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26
IZ		 2807 if (!mg) {
2808 do_update:
8c34e50d 2809 if (Gv_AMupdate(stash, 0) == -1)
242f8760 2810 return NULL;
ad64d0ec 2811 mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table);
32251b26 2812 }
a9fd4e40 2813 assert(mg);
32251b26 2814 amtp = (AMT*)mg->mg_ptr;
66978156 2815 if ( amtp->was_ok_sub != newgen )
32251b26 2816 goto do_update;
3ad83ce7 2817 if (AMT_AMAGIC(amtp)) {
b7787f18 2818 CV * const ret = amtp->table[id];
3ad83ce7
AMS		 2819 if (ret && isGV(ret)) { /* Autoloading stab */
2820 /* Passing it through may have resulted in a warning
2821 "Inherited AUTOLOAD for a non-method deprecated", since
2822 our caller is going through a function call, not a method call.
2823 So return the CV for AUTOLOAD, setting $AUTOLOAD. */
890ce7af 2824 GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]);
3ad83ce7
AMS		 2825
2826 if (gv && GvCV(gv))
2827 return GvCV(gv);
2828 }
2829 return ret;
2830 }
a0288114 2831
601f1833 2832 return NULL;
32251b26
IZ		 2833}
2834
2835
6f1401dc
DM		 2836/* Implement tryAMAGICun_MG macro.
2837 Do get magic, then see if the stack arg is overloaded and if so call it.
2838 Flags:
2839 AMGf_set return the arg using SETs rather than assigning to
2840 the targ
2841 AMGf_numeric apply sv_2num to the stack arg.
2842*/
2843
2844bool
2845Perl_try_amagic_un(pTHX_ int method, int flags) {
6f1401dc
DM		 2846 dSP;
2847 SV* tmpsv;
2848 SV* const arg = TOPs;
2849
2850 SvGETMAGIC(arg);
2851
9f8bf298 2852 if (SvAMAGIC(arg) && (tmpsv = amagic_call(arg, &PL_sv_undef, method,
636ac8fc
FC		 2853 AMGf_noright | AMGf_unary
2854 | (flags & AMGf_numarg))))
2855 {
6f1401dc
DM		 2856 if (flags & AMGf_set) {
2857 SETs(tmpsv);
2858 }
2859 else {
2860 dTARGET;
2861 if (SvPADMY(TARG)) {
2862 sv_setsv(TARG, tmpsv);
2863 SETTARG;
2864 }
2865 else
2866 SETs(tmpsv);
2867 }
2868 PUTBACK;
2869 return TRUE;
2870 }
2871
2872 if ((flags & AMGf_numeric) && SvROK(arg))
2873 *sp = sv_2num(arg);
2874 return FALSE;
2875}
2876
2877
2878/* Implement tryAMAGICbin_MG macro.
2879 Do get magic, then see if the two stack args are overloaded and if so
2880 call it.
2881 Flags:
2882 AMGf_set return the arg using SETs rather than assigning to
2883 the targ
2884 AMGf_assign op may be called as mutator (eg +=)
2885 AMGf_numeric apply sv_2num to the stack arg.
2886*/
2887
2888bool
2889Perl_try_amagic_bin(pTHX_ int method, int flags) {
6f1401dc
DM		 2890 dSP;
2891 SV* const left = TOPm1s;
2892 SV* const right = TOPs;
2893
2894 SvGETMAGIC(left);
2895 if (left != right)
2896 SvGETMAGIC(right);
2897
2898 if (SvAMAGIC(left) || SvAMAGIC(right)) {
2899 SV * const tmpsv = amagic_call(left, right, method,
636ac8fc
FC		 2900 ((flags & AMGf_assign) && opASSIGN ? AMGf_assign: 0)
2901 | (flags & AMGf_numarg));
6f1401dc
DM		 2902 if (tmpsv) {
2903 if (flags & AMGf_set) {
2904 (void)POPs;
2905 SETs(tmpsv);
2906 }
2907 else {
2908 dATARGET;
2909 (void)POPs;
2910 if (opASSIGN || SvPADMY(TARG)) {
2911 sv_setsv(TARG, tmpsv);
2912 SETTARG;
2913 }
2914 else
2915 SETs(tmpsv);
2916 }
2917 PUTBACK;
2918 return TRUE;
2919 }
2920 }
75ea7a12
FC		 2921 if(left==right && SvGMAGICAL(left)) {
2922 SV * const left = sv_newmortal();
2923 *(sp-1) = left;
2924 /* Print the uninitialized warning now, so it includes the vari-
2925 able name. */
2926 if (!SvOK(right)) {
2927 if (ckWARN(WARN_UNINITIALIZED)) report_uninit(right);
2928 sv_setsv_flags(left, &PL_sv_no, 0);
2929 }
2930 else sv_setsv_flags(left, right, 0);
2931 SvGETMAGIC(right);
2932 }
6f1401dc 2933 if (flags & AMGf_numeric) {
75ea7a12
FC		 2934 if (SvROK(TOPm1s))
2935 *(sp-1) = sv_2num(TOPm1s);
6f1401dc
DM		 2936 if (SvROK(right))
2937 *sp = sv_2num(right);
2938 }
2939 return FALSE;
2940}
2941
25a9ffce
NC		 2942SV *
2943Perl_amagic_deref_call(pTHX_ SV *ref, int method) {
2944 SV *tmpsv = NULL;
3d147ac2 2945 HV *stash;
25a9ffce
NC		 2946
2947 PERL_ARGS_ASSERT_AMAGIC_DEREF_CALL;
2948
3d147ac2
DM		 2949 if (!SvAMAGIC(ref))
2950 return ref;
2951 /* return quickly if none of the deref ops are overloaded */
2952 stash = SvSTASH(SvRV(ref));
2953 assert(SvOOK(stash));
2954 if (HvAUX(stash)->xhv_aux_flags & HvAUXf_NO_DEREF)
2955 return ref;
2956
2957 while ((tmpsv = amagic_call(ref, &PL_sv_undef, method,
25a9ffce
NC		 2958 AMGf_noright | AMGf_unary))) {
2959 if (!SvROK(tmpsv))
2960 Perl_croak(aTHX_ "Overloaded dereference did not return a reference");
2961 if (tmpsv == ref || SvRV(tmpsv) == SvRV(ref)) {
2962 /* Bail out if it returns us the same reference. */
2963 return tmpsv;
2964 }
2965 ref = tmpsv;
3d147ac2
DM		 2966 if (!SvAMAGIC(ref))
2967 break;
25a9ffce
NC		 2968 }
2969 return tmpsv ? tmpsv : ref;
2970}
6f1401dc 2971
8d569291
FC		 2972bool
2973Perl_amagic_is_enabled(pTHX_ int method)
2974{
2975 SV *lex_mask = cop_hints_fetch_pvs(PL_curcop, "overloading", 0);
2976
2977 assert(PL_curcop->cop_hints & HINT_NO_AMAGIC);
2978
2979 if ( !lex_mask || !SvOK(lex_mask) )
2980 /* overloading lexically disabled */
2981 return FALSE;
2982 else if ( lex_mask && SvPOK(lex_mask) ) {
2983 /* we have an entry in the hints hash, check if method has been
2984 * masked by overloading.pm */
2985 STRLEN len;
2986 const int offset = method / 8;
2987 const int bit = method % 8;
2988 char *pv = SvPV(lex_mask, len);
2989
2990 /* Bit set, so this overloading operator is disabled */
2991 if ( (STRLEN)offset < len && pv[offset] & ( 1 << bit ) )
2992 return FALSE;
2993 }
2994 return TRUE;
2995}
2996
a0d0e21e 2997SV*
864dbfa3 2998Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags)
a0d0e21e 2999{
27da23d5 3000 dVAR;
b267980d 3001 MAGIC *mg;
9c5ffd7c 3002 CV *cv=NULL;
a0d0e21e 3003 CV **cvp=NULL, **ocvp=NULL;
9c5ffd7c 3004 AMT *amtp=NULL, *oamtp=NULL;
b464bac0
AL		 3005 int off = 0, off1, lr = 0, notfound = 0;
3006 int postpr = 0, force_cpy = 0;
3007 int assign = AMGf_assign & flags;
3008 const int assignshift = assign ? 1 : 0;
bf5522a1 3009 int use_default_op = 0;
67288365 3010 int force_scalar = 0;
497b47a8
JH		 3011#ifdef DEBUGGING
3012 int fl=0;
497b47a8 3013#endif
25716404 3014 HV* stash=NULL;
7918f24d
NC		 3015
3016 PERL_ARGS_ASSERT_AMAGIC_CALL;
3017
e46c382e 3018 if ( PL_curcop->cop_hints & HINT_NO_AMAGIC ) {
8d569291 3019 if (!amagic_is_enabled(method)) return NULL;
e46c382e
YK		 3020 }
3021
a0d0e21e 3022 if (!(AMGf_noleft & flags) && SvAMAGIC(left)
0a2c84ab 3023 && (stash = SvSTASH(SvRV(left))) && Gv_AMG(stash)
ad64d0ec 3024 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3025 && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3026 ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3027 : NULL))
b267980d 3028 && ((cv = cvp[off=method+assignshift])
748a9306
LW		 3029 || (assign && amtp->fallback > AMGfallNEVER && /* fallback to
3030 * usual method */
497b47a8
JH		 3031 (
3032#ifdef DEBUGGING
3033 fl = 1,
a0288114 3034#endif
497b47a8 3035 cv = cvp[off=method])))) {
a0d0e21e
LW		 3036 lr = -1; /* Call method for left argument */
3037 } else {
3038 if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) {
3039 int logic;
3040
3041 /* look for substituted methods */
ee239bfe 3042 /* In all the covered cases we should be called with assign==0. */
a0d0e21e
LW		 3043 switch (method) {
3044 case inc_amg:
ee239bfe
IZ		 3045 force_cpy = 1;
3046 if ((cv = cvp[off=add_ass_amg])
3047 || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) {
3280af22 3048 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3049 }
3050 break;
3051 case dec_amg:
ee239bfe
IZ		 3052 force_cpy = 1;
3053 if ((cv = cvp[off = subtr_ass_amg])
3054 || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) {
3280af22 3055 right = &PL_sv_yes; lr = -1; assign = 1;
a0d0e21e
LW		 3056 }
3057 break;
3058 case bool__amg:
3059 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg]));
3060 break;
3061 case numer_amg:
3062 (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg]));
3063 break;
3064 case string_amg:
3065 (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg]));
3066 break;
b7787f18
AL		 3067 case not_amg:
3068 (void)((cv = cvp[off=bool__amg])
3069 || (cv = cvp[off=numer_amg])
3070 || (cv = cvp[off=string_amg]));
2ab54efd
MB		 3071 if (cv)
3072 postpr = 1;
b7787f18 3073 break;
748a9306
LW		 3074 case copy_amg:
3075 {
76e3520e
GS		 3076 /*
3077 * SV* ref causes confusion with the interpreter variable of
3078 * the same name
3079 */
890ce7af 3080 SV* const tmpRef=SvRV(left);
76e3520e 3081 if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) {
fc36a67e 3082 /*
3083 * Just to be extra cautious. Maybe in some
3084 * additional cases sv_setsv is safe, too.
3085 */
890ce7af 3086 SV* const newref = newSVsv(tmpRef);
748a9306 3087 SvOBJECT_on(newref);
a1cd65be
FC		 3088 /* No need to do SvAMAGIC_on here, as SvAMAGIC macros
3089 delegate to the stash. */
85fbaab2 3090 SvSTASH_set(newref, MUTABLE_HV(SvREFCNT_inc(SvSTASH(tmpRef))));
748a9306
LW		 3091 return newref;
3092 }
3093 }
3094 break;
a0d0e21e 3095 case abs_amg:
b267980d 3096 if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg])
a0d0e21e 3097 && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) {
890ce7af 3098 SV* const nullsv=sv_2mortal(newSViv(0));
a0d0e21e 3099 if (off1==lt_amg) {
890ce7af 3100 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3101 lt_amg,AMGf_noright);
3102 logic = SvTRUE(lessp);
3103 } else {
890ce7af 3104 SV* const lessp = amagic_call(left,nullsv,
a0d0e21e
LW		 3105 ncmp_amg,AMGf_noright);
3106 logic = (SvNV(lessp) < 0);
3107 }
3108 if (logic) {
3109 if (off==subtr_amg) {
3110 right = left;
748a9306 3111 left = nullsv;
a0d0e21e
LW		 3112 lr = 1;
3113 }
3114 } else {
3115 return left;
3116 }
3117 }
3118 break;
3119 case neg_amg:
155aba94 3120 if ((cv = cvp[off=subtr_amg])) {
a0d0e21e
LW		 3121 right = left;
3122 left = sv_2mortal(newSViv(0));
3123 lr = 1;
3124 }
3125 break;
f216259d 3126 case int_amg:
f5284f61 3127 case iter_amg: /* XXXX Eventually should do to_gv. */
c4c7412c 3128 case ftest_amg: /* XXXX Eventually should do to_gv. */
d4b87e75 3129 case regexp_amg:
b267980d
NIS		 3130 /* FAIL safe */
3131 return NULL; /* Delegate operation to standard mechanisms. */
81d52ecd 3132
f5284f61
IZ		 3133 case to_sv_amg:
3134 case to_av_amg:
3135 case to_hv_amg:
3136 case to_gv_amg:
3137 case to_cv_amg:
3138 /* FAIL safe */
b267980d 3139 return left; /* Delegate operation to standard mechanisms. */
81d52ecd 3140
a0d0e21e
LW		 3141 default:
3142 goto not_found;
3143 }
3144 if (!cv) goto not_found;
3145 } else if (!(AMGf_noright & flags) && SvAMAGIC(right)
0a2c84ab 3146 && (stash = SvSTASH(SvRV(right))) && Gv_AMG(stash)
ad64d0ec 3147 && (mg = mg_find((const SV *)stash, PERL_MAGIC_overload_table))
b267980d 3148 && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr)
a6006777 3149 ? (amtp = (AMT*)mg->mg_ptr)->table
d4c19fe8 3150 : NULL))
69815d08
RS		 3151 && (cv = cvp[off=method])) { /* Method for right
3152 * argument found */
3153 lr=1;
bf5522a1
MB		 3154 } else if (((cvp && amtp->fallback > AMGfallNEVER)
3155 || (ocvp && oamtp->fallback > AMGfallNEVER))
a0d0e21e
LW		 3156 && !(flags & AMGf_unary)) {
3157 /* We look for substitution for
3158 * comparison operations and
fc36a67e 3159 * concatenation */
a0d0e21e
LW		 3160 if (method==concat_amg || method==concat_ass_amg
3161 || method==repeat_amg || method==repeat_ass_amg) {
3162 return NULL; /* Delegate operation to string conversion */
3163 }
3164 off = -1;
3165 switch (method) {
3166 case lt_amg:
3167 case le_amg:
3168 case gt_amg:
3169 case ge_amg:
3170 case eq_amg:
3171 case ne_amg:
2ab54efd
MB		 3172 off = ncmp_amg;
3173 break;
a0d0e21e
LW		 3174 case slt_amg:
3175 case sle_amg:
3176 case sgt_amg:
3177 case sge_amg:
3178 case seq_amg:
3179 case sne_amg:
2ab54efd
MB		 3180 off = scmp_amg;
3181 break;
a0d0e21e 3182 }
bf5522a1
MB		 3183 if (off != -1) {
3184 if (ocvp && (oamtp->fallback > AMGfallNEVER)) {
3185 cv = ocvp[off];
3186 lr = -1;
3187 }
3188 if (!cv && (cvp && amtp->fallback > AMGfallNEVER)) {
3189 cv = cvp[off];
3190 lr = 1;
3191 }
3192 }
3193 if (cv)
2ab54efd
MB		 3194 postpr = 1;
3195 else
3196 goto not_found;
a0d0e21e 3197 } else {
a6006777 3198 not_found: /* No method found, either report or croak */
b267980d
NIS		 3199 switch (method) {
3200 case to_sv_amg:
3201 case to_av_amg:
3202 case to_hv_amg:
3203 case to_gv_amg:
3204 case to_cv_amg:
3205 /* FAIL safe */
3206 return left; /* Delegate operation to standard mechanisms. */
b267980d 3207 }
a0d0e21e
LW		 3208 if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */
3209 notfound = 1; lr = -1;
3210 } else if (cvp && (cv=cvp[nomethod_amg])) {
3211 notfound = 1; lr = 1;
bf5522a1
MB		 3212 } else if ((use_default_op =
3213 (!ocvp || oamtp->fallback >= AMGfallYES)
3214 && (!cvp || amtp->fallback >= AMGfallYES))
3215 && !DEBUG_o_TEST) {
4cc0ca18
NC		 3216 /* Skip generating the "no method found" message. */
3217 return NULL;
a0d0e21e 3218 } else {
46fc3d4c 3219 SV *msg;
774d564b 3220 if (off==-1) off=method;
b267980d 3221 msg = sv_2mortal(Perl_newSVpvf(aTHX_
d66cca07
BF		 3222 "Operation \"%s\": no method found,%sargument %s%"SVf"%s%"SVf,
3223 AMG_id2name(method + assignshift),
3224 (flags & AMGf_unary ? " " : "\n\tleft "),
3225 SvAMAGIC(left)?
3226 "in overloaded package ":
3227 "has no overloaded magic",
3228 SvAMAGIC(left)?
3229 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(left)))))):
3230 SVfARG(&PL_sv_no),
3231 SvAMAGIC(right)?
3232 ",\n\tright argument in overloaded package ":
3233 (flags & AMGf_unary
3234 ? ""
3235 : ",\n\tright argument has no overloaded magic"),
3236 SvAMAGIC(right)?
3237 SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(SvSTASH(SvRV(right)))))):
3238 SVfARG(&PL_sv_no)));
bf5522a1 3239 if (use_default_op) {
d66cca07 3240 DEBUG_o( Perl_deb(aTHX_ "%"SVf, SVfARG(msg)) );
a0d0e21e 3241 } else {
be2597df 3242 Perl_croak(aTHX_ "%"SVf, SVfARG(msg));
a0d0e21e
LW		 3243 }
3244 return NULL;
3245 }
ee239bfe 3246 force_cpy = force_cpy || assign;
a0d0e21e
LW		 3247 }
3248 }
67288365
JL		 3249
3250 switch (method) {
3251 /* in these cases, we're calling '+' or '-' as a fallback for a ++ or --
3252 * operation. we need this to return a value, so that it can be assigned
3253 * later on, in the postpr block (case inc_amg/dec_amg), even if the
3254 * increment or decrement was itself called in void context */
3255 case inc_amg:
3256 if (off == add_amg)
3257 force_scalar = 1;
3258 break;
3259 case dec_amg:
3260 if (off == subtr_amg)
3261 force_scalar = 1;
3262 break;
3263 /* in these cases, we're calling an assignment variant of an operator
3264 * (+= rather than +, for instance). regardless of whether it's a
3265 * fallback or not, it always has to return a value, which will be
3266 * assigned to the proper variable later */
3267 case add_amg:
3268 case subtr_amg:
3269 case mult_amg:
3270 case div_amg:
3271 case modulo_amg:
3272 case pow_amg:
3273 case lshift_amg:
3274 case rshift_amg:
3275 case repeat_amg:
3276 case concat_amg:
3277 case band_amg:
3278 case bor_amg:
3279 case bxor_amg:
6d06ecce
FC		 3280 case sband_amg:
3281 case sbor_amg:
3282 case sbxor_amg:
67288365
JL		 3283 if (assign)
3284 force_scalar = 1;
3285 break;
3286 /* the copy constructor always needs to return a value */
3287 case copy_amg:
3288 force_scalar = 1;
3289 break;
3290 /* because of the way these are implemented (they don't perform the
3291 * dereferencing themselves, they return a reference that perl then
3292 * dereferences later), they always have to be in scalar context */
3293 case to_sv_amg:
3294 case to_av_amg:
3295 case to_hv_amg:
3296 case to_gv_amg:
3297 case to_cv_amg:
3298 force_scalar = 1;
3299 break;
3300 /* these don't have an op of their own; they're triggered by their parent
3301 * op, so the context there isn't meaningful ('$a and foo()' in void
3302 * context still needs to pass scalar context on to $a's bool overload) */
3303 case bool__amg:
3304 case numer_amg:
3305 case string_amg:
3306 force_scalar = 1;
3307 break;
3308 }
3309
497b47a8 3310#ifdef DEBUGGING
a0d0e21e 3311 if (!notfound) {
497b47a8 3312 DEBUG_o(Perl_deb(aTHX_
d66cca07 3313 "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %"SVf"%s\n",
497b47a8
JH		 3314 AMG_id2name(off),
3315 method+assignshift==off? "" :
a0288114 3316 " (initially \"",
497b47a8
JH		 3317 method+assignshift==off? "" :
3318 AMG_id2name(method+assignshift),
a0288114 3319 method+assignshift==off? "" : "\")",
497b47a8
JH		 3320 flags & AMGf_unary? "" :
3321 lr==1 ? " for right argument": " for left argument",
3322 flags & AMGf_unary? " for argument" : "",
d66cca07 3323 stash ? SVfARG(sv_2mortal(newSVhek(HvNAME_HEK(stash)))) : SVfARG(newSVpvs_flags("null", SVs_TEMP)),
497b47a8 3324 fl? ",\n\tassignment variant used": "") );
ee239bfe 3325 }
497b47a8 3326#endif
748a9306
LW		 3327 /* Since we use shallow copy during assignment, we need
3328 * to dublicate the contents, probably calling user-supplied
3329 * version of copy operator
3330 */
ee239bfe
IZ		 3331 /* We need to copy in following cases:
3332 * a) Assignment form was called.
3333 * assignshift==1, assign==T, method + 1 == off
3334 * b) Increment or decrement, called directly.
3335 * assignshift==0, assign==0, method + 0 == off
3336 * c) Increment or decrement, translated to assignment add/subtr.
b267980d 3337 * assignshift==0, assign==T,
ee239bfe
IZ		 3338 * force_cpy == T
3339 * d) Increment or decrement, translated to nomethod.
b267980d 3340 * assignshift==0, assign==0,
ee239bfe
IZ		 3341 * force_cpy == T
3342 * e) Assignment form translated to nomethod.
3343 * assignshift==1, assign==T, method + 1 != off
3344 * force_cpy == T
3345 */
3346 /* off is method, method+assignshift, or a result of opcode substitution.
3347 * In the latter case assignshift==0, so only notfound case is important.
3348 */
73512201 3349 if ( (lr == -1) && ( ( (method + assignshift == off)
ee239bfe 3350 && (assign || (method == inc_amg) || (method == dec_amg)))
73512201 3351 || force_cpy) )
6f1401dc 3352 {
1b38c28e
NC		 3353 /* newSVsv does not behave as advertised, so we copy missing
3354 * information by hand */
3355 SV *tmpRef = SvRV(left);
3356 SV *rv_copy;
31d632c3 3357 if (SvREFCNT(tmpRef) > 1 && (rv_copy = AMG_CALLunary(left,copy_amg))) {
1b38c28e
NC		 3358 SvRV_set(left, rv_copy);
3359 SvSETMAGIC(left);
e7881358 3360 SvREFCNT_dec_NN(tmpRef);
1b38c28e 3361 }
6f1401dc
DM		 3362 }
3363
a0d0e21e
LW		 3364 {
3365 dSP;
3366 BINOP myop;
3367 SV* res;
b7787f18 3368 const bool oldcatch = CATCH_GET;
67288365 3369 I32 oldmark, nret;
1c23e2bd 3370 U8 gimme = force_scalar ? G_SCALAR : GIMME_V;
a0d0e21e 3371
54310121 3372 CATCH_SET(TRUE);
a0d0e21e
LW		 3373 Zero(&myop, 1, BINOP);
3374 myop.op_last = (OP *) &myop;
b37c2d43 3375 myop.op_next = NULL;
67288365
JL		 3376 myop.op_flags = OPf_STACKED;
3377
3378 switch (gimme) {
3379 case G_VOID:
3380 myop.op_flags |= OPf_WANT_VOID;
3381 break;
3382 case G_ARRAY:
3383 if (flags & AMGf_want_list) {
3384 myop.op_flags |= OPf_WANT_LIST;
3385 break;
3386 }
3387 /* FALLTHROUGH */
3388 default:
3389 myop.op_flags |= OPf_WANT_SCALAR;
3390 break;
3391 }
a0d0e21e 3392
e788e7d3 3393 PUSHSTACKi(PERLSI_OVERLOAD);
a0d0e21e 3394 ENTER;
462e5cf6 3395 SAVEOP();
533c011a 3396 PL_op = (OP *) &myop;
3280af22 3397 if (PERLDB_SUB && PL_curstash != PL_debstash)
533c011a 3398 PL_op->op_private |= OPpENTERSUB_DB;
897d3989 3399 Perl_pp_pushmark(aTHX);
a0d0e21e 3400
924508f0 3401 EXTEND(SP, notfound + 5);
a0d0e21e
LW		 3402 PUSHs(lr>0? right: left);
3403 PUSHs(lr>0? left: right);
3280af22 3404 PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no ));
a0d0e21e 3405 if (notfound) {
59cd0e26
NC		 3406 PUSHs(newSVpvn_flags(AMG_id2name(method + assignshift),
3407 AMG_id2namelen(method + assignshift), SVs_TEMP));
a0d0e21e 3408 }
636ac8fc
FC		 3409 else if (flags & AMGf_numarg)
3410 PUSHs(&PL_sv_undef);
3411 if (flags & AMGf_numarg)
3412 PUSHs(&PL_sv_yes);
ad64d0ec 3413 PUSHs(MUTABLE_SV(cv));
a0d0e21e 3414 PUTBACK;
67288365 3415 oldmark = TOPMARK;
a0d0e21e 3416
139d0ce6 3417 if ((PL_op = PL_ppaddr[OP_ENTERSUB](aTHX)))
cea2e8a9 3418 CALLRUNOPS(aTHX);
a0d0e21e
LW		 3419 LEAVE;
3420 SPAGAIN;
67288365
JL		 3421 nret = SP - (PL_stack_base + oldmark);
3422
3423 switch (gimme) {
3424 case G_VOID:
3425 /* returning NULL has another meaning, and we check the context
3426 * at the call site too, so this can be differentiated from the
3427 * scalar case */
3428 res = &PL_sv_undef;
3429 SP = PL_stack_base + oldmark;
3430 break;
3431 case G_ARRAY: {
3432 if (flags & AMGf_want_list) {
3433 res = sv_2mortal((SV *)newAV());
3434 av_extend((AV *)res, nret);
3435 while (nret--)
3436 av_store((AV *)res, nret, POPs);
3437 break;
3438 }
3439 /* FALLTHROUGH */
3440 }
3441 default:
3442 res = POPs;
3443 break;
3444 }
a0d0e21e 3445
ebafeae7 3446 PUTBACK;
d3acc0f7 3447 POPSTACK;
54310121 3448 CATCH_SET(oldcatch);
a0d0e21e 3449
a0d0e21e 3450 if (postpr) {
b7787f18 3451 int ans;
a0d0e21e
LW		 3452 switch (method) {
3453 case le_amg:
3454 case sle_amg:
3455 ans=SvIV(res)<=0; break;
3456 case lt_amg:
3457 case slt_amg:
3458 ans=SvIV(res)<0; break;
3459 case ge_amg:
3460 case sge_amg:
3461 ans=SvIV(res)>=0; break;
3462 case gt_amg:
3463 case sgt_amg:
3464 ans=SvIV(res)>0; break;
3465 case eq_amg:
3466 case seq_amg:
3467 ans=SvIV(res)==0; break;
3468 case ne_amg:
3469 case sne_amg:
3470 ans=SvIV(res)!=0; break;
3471 case inc_amg:
3472 case dec_amg:
bbce6d69 3473 SvSetSV(left,res); return left;
dc437b57 3474 case not_amg:
fe7ac86a 3475 ans=!SvTRUE(res); break;
b7787f18
AL		 3476 default:
3477 ans=0; break;
a0d0e21e 3478 }
54310121 3479 return boolSV(ans);
748a9306
LW		 3480 } else if (method==copy_amg) {
3481 if (!SvROK(res)) {
cea2e8a9 3482 Perl_croak(aTHX_ "Copy method did not return a reference");
748a9306
LW		 3483 }
3484 return SvREFCNT_inc(SvRV(res));
a0d0e21e
LW		 3485 } else {
3486 return res;
3487 }
3488 }
3489}
c9d5ac95 3490
f5c1e807
NC		 3491void
3492Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags)
3493{
3494 dVAR;
acda4c6a 3495 U32 hash;
f5c1e807 3496
7918f24d 3497 PERL_ARGS_ASSERT_GV_NAME_SET;
f5c1e807 3498
acda4c6a
NC		 3499 if (len > I32_MAX)
3500 Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len);
3501
ae8cc45f
NC		 3502 if (!(flags & GV_ADD) && GvNAME_HEK(gv)) {
3503 unshare_hek(GvNAME_HEK(gv));
3504 }
3505
acda4c6a 3506 PERL_HASH(hash, name, len);
c60dbbc3 3507 GvNAME_HEK(gv) = share_hek(name, (flags & SVf_UTF8 ? -(I32)len : (I32)len), hash);
f5c1e807
NC		 3508}
3509
66610fdd 3510/*
f7461760
Z		 3511=for apidoc gv_try_downgrade
3512
2867cdbc
Z		 3513If the typeglob C<gv> can be expressed more succinctly, by having
3514something other than a real GV in its place in the stash, replace it
3515with the optimised form. Basic requirements for this are that C<gv>
3516is a real typeglob, is sufficiently ordinary, and is only referenced
3517from its package. This function is meant to be used when a GV has been
3518looked up in part to see what was there, causing upgrading, but based
3519on what was found it turns out that the real GV isn't required after all.
3520
3521If C<gv> is a completely empty typeglob, it is deleted from the stash.
3522
3523If C<gv> is a typeglob containing only a sufficiently-ordinary constant
3524sub, the typeglob is replaced with a scalar-reference placeholder that
3525more compactly represents the same thing.
f7461760
Z		 3526
3527=cut
3528*/
3529
3530void
3531Perl_gv_try_downgrade(pTHX_ GV *gv)
3532{
3533 HV *stash;
3534 CV *cv;
3535 HEK *namehek;
3536 SV **gvp;
3537 PERL_ARGS_ASSERT_GV_TRY_DOWNGRADE;
95f56751
FC		 3538
3539 /* XXX Why and where does this leave dangling pointers during global
3540 destruction? */
627364f1 3541 if (PL_phase == PERL_PHASE_DESTRUCT) return;
95f56751 3542
2867cdbc 3543 if (!(SvREFCNT(gv) == 1 && SvTYPE(gv) == SVt_PVGV && !SvFAKE(gv) &&
803f2748 3544 !SvOBJECT(gv) && !SvREADONLY(gv) &&
f7461760 3545 isGV_with_GP(gv) && GvGP(gv) &&
2867cdbc 3546 !GvINTRO(gv) && GvREFCNT(gv) == 1 &&
f7461760 3547 !GvSV(gv) && !GvAV(gv) && !GvHV(gv) && !GvIOp(gv) && !GvFORM(gv) &&
099be4f1 3548 GvEGVx(gv) == gv && (stash = GvSTASH(gv))))
2867cdbc 3549 return;
2be08ad1
FC		 3550 if (gv == PL_statgv || gv == PL_last_in_gv || gv == PL_stderrgv)
3551 return;
803f2748
DM		 3552 if (SvMAGICAL(gv)) {
3553 MAGIC *mg;
3554 /* only backref magic is allowed */
3555 if (SvGMAGICAL(gv) || SvSMAGICAL(gv))
3556 return;
3557 for (mg = SvMAGIC(gv); mg; mg = mg->mg_moremagic) {
3558 if (mg->mg_type != PERL_MAGIC_backref)
3559 return;
3560 }
3561 }
2867cdbc
Z		 3562 cv = GvCV(gv);
3563 if (!cv) {
3564 HEK *gvnhek = GvNAME_HEK(gv);
0ca9877d 3565 (void)hv_deletehek(stash, gvnhek, G_DISCARD);
8941bf97 3566 } else if (GvMULTI(gv) && cv && SvREFCNT(cv) == 1 &&
f7461760 3567 !SvOBJECT(cv) && !SvMAGICAL(cv) && !SvREADONLY(cv) &&
34d81fc4 3568 CvSTASH(cv) == stash && !CvNAMED(cv) && CvGV(cv) == gv &&
f7461760
Z		 3569 CvCONST(cv) && !CvMETHOD(cv) && !CvLVALUE(cv) && !CvUNIQUE(cv) &&
3570 !CvNODEBUG(cv) && !CvCLONE(cv) && !CvCLONED(cv) && !CvANON(cv) &&
3571 (namehek = GvNAME_HEK(gv)) &&
48c2c411 3572 (gvp = hv_fetchhek(stash, namehek, 0)) &&
f7461760
Z		 3573 *gvp == (SV*)gv) {
3574 SV *value = SvREFCNT_inc(CvXSUBANY(cv).any_ptr);
70e5f2b5 3575 const bool imported = !!GvIMPORTED_CV(gv);
f7461760
Z		 3576 SvREFCNT(gv) = 0;
3577 sv_clear((SV*)gv);
3578 SvREFCNT(gv) = 1;
70e5f2b5 3579 SvFLAGS(gv) = SVt_IV|SVf_ROK|SVprv_PCS_IMPORTED * imported;
dc6369ef
EH		 3580
3581 /* See also: 'SET_SVANY_FOR_BODYLESS_IV' in sv.c */
f7461760
Z		 3582 SvANY(gv) = (XPVGV*)((char*)&(gv->sv_u.svu_iv) -
3583 STRUCT_OFFSET(XPVIV, xiv_iv));
3584 SvRV_set(gv, value);
3585 }
3586}
3587
9e3fb20c
FC		 3588GV *
3589Perl_gv_override(pTHX_ const char * const name, const STRLEN len)
3590{
3591 GV *gv = gv_fetchpvn(name, len, GV_NOTQUAL, SVt_PVCV);
3592 GV * const *gvp;
3593 PERL_ARGS_ASSERT_GV_OVERRIDE;
3594 if (gv && GvCVu(gv) && GvIMPORTED_CV(gv)) return gv;
3595 gvp = (GV**)hv_fetch(PL_globalstash, name, len, FALSE);
3596 gv = gvp ? *gvp : NULL;
3597 if (gv && !isGV(gv)) {
3598 if (!SvPCS_IMPORTED(gv)) return NULL;
3599 gv_init(gv, PL_globalstash, name, len, 0);
3600 return gv;
3601 }
3602 return gv && GvCVu(gv) && GvIMPORTED_CV(gv) ? gv : NULL;
3603}
3604
4aaa4757
FC		 3605#include "XSUB.h"
3606
3607static void
3608core_xsub(pTHX_ CV* cv)
3609{
3610 Perl_croak(aTHX_
3611 "&CORE::%s cannot be called directly", GvNAME(CvGV(cv))
3612 );
3613}
3614
f7461760 3615/*
14d04a33 3616 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3617 */
Unnamed repository; edit this file 'description' to name the repository.